Title of Invention

A COMPOSITE LENS AND A METHOD FOR MANUFACTURING THE SAME

Abstract

The present invention relates toa composite lens comprising a substrate and a discrete layer of resin polymerized in place over said substrate and bounded thereto,said discrete layer comprising a crosslinked polymer network of 1% to 50% by weight of a reactive plasticizer within a fully polymerized and non-reactive dead plymer. ABSTRACT In/pct/2002/1286/che A composite lens The present invention relates to a composite lens comprising a substrate and a discrete layer of resin polymerized in place over said substrate and bonded thereto said discrete layer comprising a crosslinked polymer network of 1% to 50% by weight of a reactive plasticizer within a fully polymerized and non-reactive dead polymer

Full Text

PRECISION COMPOSITE ARTICLE FIELD OF THE INVENTION This invention is related to the fields of polymerization and molding. More particularly it related to a process for quickly and inexpensively producing an optical quality lens or other transparent optic on an underlying substrate. It is also related to optimal materials of construction and to the resulting composite structure. BACKGROUND OF THE INVENTION Ophthalmic lenses are used to correct vision by changing the focal length of the light ray entering the pupil of an eyeglass-wearer. When the patient is near-sighted or far-sighted, the correction is rather simply made using a single vision lens in which the outer and inner surfaces the lens are tithe spherical, but have different radii of curvature. An added level of complication occurs when a patient exhibits astigmatism in one or both eyes. In this case the back surface of lens is made steroidal by imposing two different radii of curvature on the same surface. In order t properly con-act for astigmatism, the rotational position of the toroidal surface must be fixed with respect to the pupil of the eyeglass-wearer (typically accomplished with the eyeglass frames). Patients who require multi-vision lenses, such as bifocals and progressives, introduce yet level of complication. In this case, a bifocal or progressive pocket (an °add" pocket) is molded in titer front surface of the lens, providing a lens that corrects to various focal lengths across the ten depending on the spatial distribution of the add pocket The most common example of this is someone who is both near-sighted (needs eyeglasses to see objects at a distance) and far-sigh (needs a bifocal pocket to read text). When a patient needs both multi-vision lenses and astigmatic correction, the toroidal bai surface must be fixed rotationally with respect to the location and orientation of the bifocal pucks This presents an obstacle to high-throughput manufacturing of plastic ophthalmic lenses for rheas that will be discussed below. Polycarbonate is widely used as an optical material for the production of ophthalmic len: It has a refractive index of 1.586, reasonably good light transmission, and extremely good impac resistance. Imparting scratch resistance to polycartsonate lenses must typically be accomplishe with a secondary coating. Polycarbonate ophthalmic lenses are formed by injection molding. Injection molding is i process that requires high injection and clamping pressures. As a result molds are quite expend for industrial-scale equipment In addition, changing molds from one to another is time-consume and involves a significant amount of down-time for the injection molding system, as well as sing start-up time before obtaining quasi-steady-state operation. Typical ophthalmic lenses have a prescription range of +2 to -6 diopters in 1/4 diopter increments, a bifocal pocket of 0 to +3 diopters in 1/2 increments, and an astigmatic correction 1 to 2 in 1/4 increments and a specified rotational angle of 0 to 90 degrees in 1-degree increment! Thus, taking into account all of the possible variations, there are roughly 10’ different prescript possible. In terms of injection molding, there would have to be approximately 150 different front molds and 720 different back molds in order to accommodate the prescription ranges covering multi-vision lenses with astigmatic correction. These numbers increase even more when other design features such as aspherical lenses or progressives are considered. The high-volume production of polycarbonate lenses with only a few variations can be quite economical. However, since molds are expensive and change-out time is excessive, injection molding of multi-vision lenses incorporating astigmatic corrections is not practical due to the targe number of variations. Even if such a manufacturing process could be economically carried out, long tooling change-out times would require stocking the entire range of prescriptions, adding substantially to tiie cost of the lens. When the number of substiate variations is small, they may be produced economically by injection molding or ott’ r techniques. Thus, what ts needed in order to produce the relatively large number of prescription variations is a metiiod by which a lens or lens blank (i.e., subsb’tes) can be imparted with eitiier the desired back toroidal surface or the desired front multi-focal surface after the substi’te fabrication process. While some work has t>een done in this area (e.g., U.S. Pats. 4,873,029 and 5,531,940), the resins used have been liquids, which creates a new set of problems and complexities in keeping the liquid resins in place in a mold prtor to cure. A further difficulty in the ophthalmtes industry relates to tiie production of photochromic lenses, said lenses incorporating photochromic dyes that undergo a change in color upon exposure to sunlight Unfortunately, photochromic dyes are well known to be sensitive to the lens manufacturing processes. Either the dyes are attacked or degraded by the peroxide initiators used to polymerize the lens casting resins, or the dyes lose their activity upon incorporation into the lens material due to steric hindrances or other factors. In an attempt to circumvent these prot>lems, the dyes are often added after lens ‘brication by means of an "imbibitton' process in whk:h the dyes are imbibed or absorbed partially into the lens in a hot water bath. In this case, tong soaking times at higt temperatiir»$ and -Softer lens materials must often be used in order to achieve acceptebls dye uptake. The resultant thin layer of photochrome dye concentrated in tiie near-surface region of tiie lens shows problematic behavior in terms of both degree of tint obtained in the darkened state, as well as fatigue of tiie photochromic dye over time. To overcome these performance limitations, polymer matrices have been developed that successfully incorporate photochromic dyes tiiroughout tiie lens material during the fabrication process (see for example, Henry and Vial, US Patent 6.034,193). However, tiie resultant material is relatively expensive since the photochromic dye is dispersed tiiroughout tiie material. Because the product is typically a semi-finished lens blank, of which 20-90% may be ground aviray during the subsequent surfacing process, much of the valuable photochromic dye is discarded and photochromic lenses produced by tiiis technique are expensive. Thus, it would be desirable if tiie photochromic-containing material could be applied to tiie lens surface in such a way as to provide a layer of material to tiie front surface of tiie lens such that very little or none of the photochromic containing material was lost during surfecing. Further, it would be desirable if such a layer could be approximately 0.3 mm to 2.0 mm thick, such ttiat photobleaching and/or fatigue pnjblems over the lifetime of the lens were minimized. Yet another problem in the ophthalmics industry concerns the production of polarized lei Such lenses are currently produced by fixing a polarizing film within a gasketed mold assembly, the mold on both sides of the polarizing film with a curable liquid resin, then curing the resin to produce a semi-finished lens blank with an embedded polarizing film. This approach is problems because in order to achieve a thin final lens product, the spacing between the polarizing film anc lens molds must be kept small (approximately 1 mm, but preferably less than 1 mm) in order to produce a finished lens of acceptable thickness. Small spacings between the film and molds pre difficulties in keeping the film in place due to capillary forces. Fill-time delay and incorporation of bubbles are other problems associated with this manufacturing scheme. Additionally, since the li casting resins typically used in this process shrink anywhere from about 7% to about 15% or mo there can be a large stress gradient at the interface between the polarizing film and the cured re Since stress gradients at interfaces typically hinder the adhesion between two surfaces, lenses manufactured by this processing scheme often suffer from delamination failures. Alternatively, lens substrates fomned by casting, injection molding, or other techniques c be bonded to both sides of the polarizing film using optical adhesives. Such a processing schem multi-focal lenses in outlined in US Patent No. 5,351,100 by Schwenzfeier and Hanson, for exan Unfortunately, production of finished lenses of acceptable thickness requires that the starting ler substrates be relatively thin. Because the lens substrates must be quite thin (at least 1 mm, preferably about 0.5 mm), they are flimsy and difficult to handle. This leads to a difficult bonding process using optical adhesives, especially since the adhesive layer must be kept very thin so a not add to the overall thickness of the final lens, and low yields often result from this processing scheme. What is needed is a method by which lenses with an embedded polarizing film may be manufactured economically and with a thin profile, equal to at least about 2 mm, more prefenabi; equal to or less than about 1.5 mm. There is a problem in the optics industry in the manufacture of cemented doublet lenses Doublets and higher order composite lens systems are used to achieve color correction and oth Finally, a problem within the photonics industry is the difficulty associated with the prodi of optics on the surface of electronic devices. When an electronic device such as a microchip consists of one or only a few devices (such as LED, for example), then the chip is relatively stat with respect to any external stresses that may be applied during encapsulation, handling, and ir This is evidenced by the facile production of single LED devices encapsulated by a thenmoplast shell that is molded so as to provide collimating optics for the LED device on the surface of the chip. However, when it becomes desirable to encapsulate and provide optics for an array of devices all on the same chip, cun’nt manufacturing processes are much less suitable. This is because larger chip sizes (approximately 1 cm’ or larger, for example) become much more fragile as the chip size increases. Larger chips are also much more valuable. Thus, high pressure injection molding techniques cun-ently used to encapsulate single LEDs or other small microchips are not suitable for larger chip sizes. Such techniques also require high temperatures in order to reduce the viscosity of tt>e thermoplastic resins used in such processes, even with the high pressures typically used in order to achieve flow of the material, which presents further hazards to the valuable electronic devices. Attempts to cast optical components onto the chip surface are, unfortunately, hindered by the high shrinicage associated with the curing of such curable liquid resins, not to mention the difficulty in Kquid handling and gasketing required. The shrinkage resulting from cure leads to a high stress level at ‘e interface between the sut>strate and the optics, yielding stressed substrates and poor adhesion between the substrate and the cast resin. Thus, it would be desirable to have a means by which optical components, encapsulating or othenwise, could be formed on the surface of a substrate without undue shrinkage of the encapsulating material. Further, in order to prevent damage to the substrate, it would be desirable to avoid the use of high-pressure, high-temperature injection molding processes. In addition, elimination of the difficulties associated with liquid handling, and the gasketing assemblies therefore required, would further t>enefit the creation of optical component-electronic device composites. SUMMARY OF THE INVENTION: The present invention is aimed at alleviating or reducing the above-stated problems. The invention is directed to a method and materials suitable for use therewith that allow for the facile rormation of lenses or other optical components (i.e., superstraies) direciiy on the surrace of a substrate. The superstrate fomiation process occurs at low temperatures and pressures compared to the processing of pure thermoplastics, and can be accomplished rapidly in a high-throughput manufacturing scheme. The materials used are advantageously designed to exhibit low shrinkage upon cure compared to curable liquid formulations known in the art, resulting in excellent adhesion properties on a wide variety of substrates. More particulariy, the process of the invention includes the steps of obtaining a substrate; pladng a semi-solkl-like polymerizable material in contact with at least one of the front or back surfaces of the substrate and/or with a mold surface, the polymerizable material comprising a reactive plasticizer, an initiator and, optionally, a dead polymer; compressing and/or heating the resulting semi-solid/substrate sandwich within a mold assembly, where the mokl contacting the semi¬solid polymerizable material has a desired surface geometry; and exposing the semi-solid/substrate sandwich to a source of polymerizing energy (which simultaneously cures and hardens the semi¬solid polymerizable material), to yield the finished article, which is a composite sandwich of one or more previously semi-solid layers permanentiy bonded a substrate. With respect to ophthalmic lenses, the present invention is directed to a fabrication meth whereby the beneficial properties of polycarbonate (especially the impact resistance) or other op quality materials may be realized in multi-focal lenses, without the drawbacks of injection-moldin mechanically grinding a wide variety of lens prescriptions. The method makes use of a polycart>onate or other desirable substrate that is sandwiched with one or more semi-solid polymerizable materials to give a composite lens having a desired geometry and configuration. Substrate materials may be chosen to give good impact resistance, elasticity, photochnamic behavior, etc. Alternatively, the superstrate materials of this invention may be formulated to give good impact resistance, elasticity, photochromic behavior, etc. The resulting composite lens ma have exceptional impact resistance when incorporating a polycarbonate substrate, but is also es fabricated with both toroidal curves and mulb-focal pockets as a result of the semi-solid molding process. Other beneficial properties, such as photochromic or polarizing behavior, may be indue by appropriate choice of the substrate or semi-solid material(s). Also included in the present invention is a composite optical article comprising a substra and at least one layer or superstrate of a cured resin permanently bonded to the substrate, the c resin comprising a semi-interpenetrating crosslinked polymer network of reactive plasticizer with entangled dead polymer. In one embodiment, the reactive plasticizer polymer network is further crosslinked to the dead polymer. The substrate and superstrate portions of the composite artich preferably form an integral monolithic entity, capable of functioning as a cemented doublet or hig order composite lens structure. The composite article exhibits dimensional stability, high-fidelity replication of an internal mokl cavity, and high impact resistance. In one embodiment, the article of the invention is an ophthalmic lens. In a presently preferred embodiment, the final lens is a multi-vision lens and further may incorporate astigmati( corrections. In another embodiment, the article of the invention is an electronic display device compt a cured resin superstrate covering and pemtanenty bonded to the active surface of the device (substrate). The surface of the cured resin is molded into a desired geometry to control the rece or emission of light to or from the device. A presently prefen-ed embodiment is an optical anray covering one or more microchips containing a light-capturing, light-emitting, or light-altering elec device. DETAILED DESCRIPTION OF THE INVENTION: The terms "a" and "an" as used herein and in the appended claims mean "one or more" A primary advantage of this invention is to combine one or more desirable properties of substrate material (impact resistance in the case of polycarbonate, for example) with the benefit be realized by molding a semi-solid material. Additional advantages are discussed in more detc below. The composite optical articles of the present invention comprise a substrate and at leas layer or superstrate of a cured resin pennanently bonded to the substrate, the cured resin being polymer blend of a polymerized reactive plasticizer and a dead polymer or a polymerized reactive plasticizer alone. The optical lens substrate composition of the present invention may be selected to provide high impact-resistance or any other desirable property to the resulting composite lens. In accordance with an embodiment of the present invention, prefen’d polymers for use as optical lens substrates are aromatic halogenated or non-halogenated polycarbonate polymers. More preferred polymers are bisphenol A polycarbonate, ortho-methoxy bisphenol A polycarbonate, a,a'-dichloro bisphenol A polycariaonate. and poly(diphenyl methane bis{4-phenyI)cart3onate), with the most preferred material for use in connection with the present invention being bisphenol A polycartjonate. Bisphenol A poiycarisonate is commercially available in the form of finished or semi-finished single vision lens prefonns from many commercial manufecturers, examples being BMC Industries, Inc., Hoya Lens of America, Essilor of America, Inc., and Sola Optical, Inc. Bisphenol A polycarbonate has a high impact resistance, a refractive index of about 1.58 and an Abbe number of about 28-30. Other substrate materials may be useful for the present invention as well. For example, optical quality or photochromic glasses, bisallyl cartx)nates, polyethylene terephthalates, polybutyiene terephthalates, polystyrenes, polymethyi methacrylates, acrylonitrile-butadiene-styrene copolymers, poiystyrene-co-butadiene copolymers, polystyrene-co-isoprene copolymers, polycyclohexylethylene, polycyclohexylethylene-co-butadiene copolymers, amorphous polyolefins and copolyolefins, polyurethanes, or variations thereof, and others, may be advantageously used as one or more substrate materials in the present invention (many optical quality glasses and plastics are known in the current art). The substrates useful in the practice of the present invention may be simple piano lenses (i.e., no correction) consisting of two spherical or aspherical surfaces. Altematively, one surface may be spherical or aspherical, while the other surface may possess either the toroidal shape for sstsgmstic ccrrscticn or a correcuve prcscnpticn section icr rnuiu-visicn ccrreoucn. uy mUiu-viSicri and 'mutti-focal* is meant herein that there is a bifocal, a tri-focal, or a progressive focal regton present on one or more of the lens surfaces. Such substrates are readily available commercially when the front surface is multi-focal and the back surface is spherical, or when the back surface is toroklal and the front surface is spherical, because the number of different variations for either the front or the back surfaces alone is small. In the case of plastic substrates, these may be easily manufactured by standard injection molding or themioforming techniques well known in the art. The substrates may altematively have different radii of curvature comprising their front and back surfaces (i.e., non-piano surfaces). Such may be the case when, in the present invention, the primary optrcal correction is to be built into the substrate instead of into the cured resin layer. The term front surface" as used herein and in the appended claims is meant the surface of an ophthalmrc lens that is furthest away from the wearer. The front surface is usually convex or flat and also typically possesses the multi-vision con’ctive pocket or zone. The term "back surface' as used herein and in the appended claims is meant the surface of an ophthalmic lens that is closest to the wearer. The back surface is usually concave or flat, and also typically possesses the toroidal curve used for astigmatic correction. When polarized lenses are desired, a polarizing film may serve as the substrate during 1 practice of this invention. Because most commercially available polarized films are relatively sof materials unable to provide scratch-resistant properties, it is preferable to form superstrates on t sides of the polarizing film substrate. Such processes may occur sequentially, forming first the fr superstrate and then the back superstrate (or vice-versa), or the two superstrates may be forme the same time by placing semi-solid material on both sides of the film and compressing the sem solid material using front and back mold halves concurrently prior to cure. Thus, in the general practice of this invention the semi-solid polymerizable superstrate material may be added to both the front and the back surfaces of the substrate, to just the front surface of a substrate already possessing a desired back curve, or to just the back surface of a substrate already possessing a desired front curve. Alternatively, the semi-solid may be added between two substrates, one having the desired front surface geometry and the other having the desired back surface geometry. The resulting semi-solid/substrate sandwich is then compresse between two mold halves. In one embodiment of this invention, the semi-solid material is a pref having a convex curvature greater than any concave surface of the mold/substrate, while havinc lesser or more flat curvature than the mold or substrate for any convex surface of the mold/subs Subsequently, the prefomi may be placed in the center of the substrate or mold so that when th> mold(s) and/or substrate(s) are compressed together, the semi-solid makes contact with the mold/substrate near the center and flows radially outward towards the substrate or mold edges. Such a configuration allows the semi-solid material to fill in the gap between ttie substrate and r without entraining or trapping bubbles, air pockets, or other void defects between the semi-solid the substrate(s), between the semi-solid and the mold(s), or within the semi-solid itself. In another preferred emt>odiment of this invention, the semi-solkj polymerizable materia preform having the shape of a flat or neariy flat disc or plate. The disc or plate may then be sandwiched t>etween the desired configuration of molds and substrates. When temperature and pressure conditions are fixed appropriately, the flat semi-solid preform may be pressed into a a mow or substrate wittiout entraining or trapping bubbles, air pockets, or other void defects. This result is surprising in that one might expect that air pockets or other void defects would be capti between the semi-solid and mold or substrate surfaces. However, the inventors have observed when the semi-solid is not excessively heated (such that it begins to flow freely), air pockets ap| to be squeezed out and eliminated from between the approaching semi-solid and mold/substrat surfaces. This observation is important because it may prove easier or more economical to proc flat semi-solid preforms, such as by cutting from a nominally fiat sheet. Even production of prefc shapes that have at least one axis with an infinite radius of curvature (such as a cylinder, for example) should be more economical than production of prefonns with spherically curved surfa The latter type of prefomns usually require a technique such as injection molding, while the font type of prefonns may be created by first extruding a sheet having the desired two dimensional ( then cutting the desired shape from the sheets. When the semi-solid material is only molded on one side of the substrate, the substrate be supported sufficiently to hold the substrate without undesired levels of defomnation while the solid is compressed into the desired geometry. One facile method for supporting tiie substrate is to use a mold blank approximately matching the curvature or shape of the substrate. When two substrates are sandwiched with the semi-solid in between, the substrates should again have sufficient support to prevent deformation of the substrates. This may be accomplished by using molds with the approximate curvature of the substrates. In either case, optical quality surfaces on the molds are no longer required. When fabricating multi-vision ophthalmic lenses with astigmatic correction, rotating the mold or substrate possessing the toroidal sur’ce relative to the other moM or substrate possessing the multi-vision surface yields the desired rotational configuratton of the torokial surface relative to any multi-vision region in the lens. Thus, Vne rotational angle of the toroidal surface with respect to the add pocket is "dialed in' during the final molding process. This greatly reduces the inventory of nriokjs or substrates that must be stocked to produce a given range of prescriptions. And since the molds are only used to shape the semi-solid material in a comparatively low-temperature and/or bw-pressure molding process, the molds are much simpler and less expensive than those required for injection molding operations. Once the semi-solid/substrate sandwich has t>een pressed into the desired shape, the system is exposed to a source of polymerizing energy (such as UV light and/or temperature; x-rays; e-t>eam; gamma radiation; microwave radiation; or ionic initiation) to cure the semi-solid material, which forms a cured and hardened resin superstrate portion that is bonded to the sut}strate. Upon cure, the molds are separated, yielding a composite sandwich of one or more previously semi-solid layers combined with a substrate. When polycari)onate substrates are used, the resulting composite lens has exceptional impact resistance, but is also easily fabricated with t>oth toroidal curves and multi-focal pockets as a result of the semi-solid molding process. Such lenses may be economically produced by "just-in-time" manufacturing techniques, thus eliminating the need to inventory a large Presently preferred embodiments of the processing scheme described above indude the production of multi-vision composite lenses comprising a superstrate front sur’ce bonded to a substrate back surface. Said substrates may consist of commerdally available toroidal single vision lenses or tens blanks made from CR-39, polycarbonate, or another of the many ophthalmk: tens materials. A variation of this production scheme comprises a substrate or superstrate material that contains a photochromic dye. A preferred embodiment uses a semi-solid superstrate-fbmning material containing a photochromic dye to form a relatively thin photochromic layer (typically about 0.3 mm to about 2 mm, preferably 0.5 mm to 1.5 mm) on the convex surface of a lens blank substrate to give a desired composite lens structure. The benefit of this configuratkjn is that the lens blank may be surfaced (altering the back surface of the blank to fomn a finished lens by grinding and polishing to achieve the desired prescription) with little or no loss of expensive photochromic dye-containing material. A further benefit of this configuration is that the photochrome dye can be dispersed throughout the superstrate layer, thus giving a desirable photochromic layer thckness of 0.3 mm to about 2 mm. A photochromic dye can be selected from the general classes of spiroxazines, spiropyrs and chromenes. Many photochromic dyes of these types, and others, are known in the literature are available commercially. One skilled in the art will be able to select the photochromic dye(s) suitable to the desired dead polymer/reactive plasticizer system without undue experimentation. In yet another preferred embodiment of the present invention, polarized lenses having tl profiles are produced by forming superstrates on both sides of a polarizing filnn substrate. In this processing scheme, a polarizing film is chosen which has approximately the same curvature as front surface of the desired composite lens. A mold having the desired geometry for either the fr back surface (spherical, aspherical, multi-focal, toroidal, etc.) is then chosen, along with a suppc having approximately the same curvature as the polarizing film. The semi-solid material (in a prt state if desired) is then placed on either side of the polarizing film, with the support placed on th The resulting composite lens possesses an emtiedded polarizing film between two previously semi-solid superstrates. Preferably the superstrate comprising the front part of the lei approximately 0.5 to about 1 mm thick, while the back superstrate is equally thin in the center if lens is not to be surfaced further, yielding a composite lens that is about 1 to 2 mm thick. In the where the lens is to bte surfaced to give an alternate back surface, then the sacrificial superstrat (usually the back) may be as thick as about 15 mm. The presently disclosed invention may further be directed towards the production of 'cemented doublet* optical lenses by bringing a semi-solid material into contact with a first optic component and then using a mold having a desired geometry and desired optical quality surfao deform the semi-solid such that it is shaped into the geometry of a second optical component in contact with the first optical component Upon cure and mold removal, the resultant product is tl equivalent of a cemented doublet optical system in that two optical lens components are fabrics contact and effectively bonded to each other. This technique combines the formation process o1 second optical component with the bonding process to the first optical component, eliminating tl need for an optical adhesive and a separate bonding step. A further benefit is that the surface o semi-solid will be molded on one side by the first optical component, thus insuring complete ma between the two surface geometries. In a variation of the process of the invention, a first or front substrate lens having a mull vision pocket molded into the front surface (the back surface may be simply spherical, for exam and a second or back substrate lens having a toroidal back surface and a front sur’ce having nominally the same curvature as the back surface of the front lens are obtained. Next, a semi-s polymerizable material is placed between the two substrate lenses, which are then compressed together so that the semi-solid material fills in the gap and forms a layer between the two lenses. In one embodiment of this invention, the semi-solid may be placed in about the center of the two substrates so that when the substrates are compressed, the semi-solid will flow radially outward Awards the substrate edges. Such a configuration allows the semi-solid to fill in the gap between the substrates while reducing or eliminating the entrainment of bubbles, air pockets, or other void defects between the semi-solid and the substrate(s), between the semi-solid and the mold(s), or within the semi-solid itself. Finally, the entire sandwich is exposed to a soufce of polymerizing energy to cure the semi-solid material, effectively bonding the two substrate lenses together, and to also harden the semi-solid material. The semi-solid material chosen to form the layer between two such substrate lens layers may be formulated to be tough, rubbery and/or flexible such that it forms an impact-resistant layer between the two lenses. When polycariranate is used as the substrate lenses, such a configuration improves upon the already excellent impact resistance of polycarbonate by providing a cushion or impact-absorbing layer between the fiont and back polycart>onate substrates. The semi-solid layer may also be formulated to contain liquid crystalline polymers such that a polarizing film is formed and trapped in the semi-solid material (optionally t>etween two substrate lenses). Alternatively, semiconducting materials, such as for example semiconducting films or semiconductor chips (e.g., LED's), may be embedded into the semi-solid layer by placing such a film or chip between the semi-solid and the substrate(s) prior to applying and compressing the semi-solid material. The semiconducting materials may also be placed within the semi-solid material so that the semi-solid material completely encapsulates the semiconducting material prior to applying and compressing the semi-solid material. In either case, the resulting composite lens has light-emitting, light-capturing, or light-altering electronics embedded and encapsulated within. Such a system may further benefit from the semi-solid formulations contemplated in this specification by virtue of the low shrinkage associated with curing these materials that give rise to inherently lower shrinkage than CUrSSiS n’uiu iwiiiiuiauwii cmoiuya. In yet another variation of the fabrication method of the invention, the semi-solid polymerizable material may be applied to one or more surfaces of an LED, LCD, or other electronic display device. The semi-solid composition may then be compressed, squeezed, or othenvise shaped by a mold coming into contact with the semi-solid material. In one embodiment, the semi-soiki is squeezed by the mold such that it flows over and covers the active surface of the display device. The device/semi-solkl/mold sandwi’ is then exposed to a source of polymerizing energy to cure and harden the semi-solid material, after whfch the mold is removed. The resulting interface between the cured resin and the surrounding ambient has a particular desired geometry to give a surface that directs, focuses, or defocuses incoming or outgoing light. The resultant article is an encapsulated electronk: display device in which the encapsulant has molded-in optk:s on the surface for controlling the reception or emission of light toffrom the device. As compared to the use of dead polymers alone, such as conventional thermoplastics, the semi-solid materials of this invention may be molded to the surface of the electronic device at tower temperatures and/or lower pressures, leading to less stress imparted to the electronic devk:e itself. Such low-stress conskjerattons are especially important as the sizes of the electronic device to be altered continue to increase. The superstrate(s) of the devices of the present invention is formed from a semi-solid polymerizable material. The terms "semi-solid" and "semi-solid-like" as used herein and in the appended claims mean that, in essence, the polymerizable composition is a rubbery, taffy-like n' at sub-ambient, ambient, or elevated temperatures. Preferably the semi-solid mass has a suffic high viscosity to prevent dripping at ambient temperatures and pressures or below, but is mallee and can easily deform and conform to mold surfaces if the moid cavity is slightly heated or as a of pressure exerted by pressing the two mold halves together, or a combination of both heat anc pressure. In a presently preferred embodiment the viscosity will be greater than about 25,000 centipoise and preferably greater than 50,000 centipoise at the temperature at which the materis to be handled (e.g., inserted into a mold cavity). Such compositions may be handled, stored, an easily inserted into the moW assembly as a non-free-flowing material, yet are easily deformed ai shaped into the desired geometry with lower temperatures and/or less pressure than that requir* perfonm the same operation on a fully polymerized, unplastic'ized dead polymer. An advantage of this semi-solid composition is that it can be pre-formed into a slab, disk ball, or sheet, for example, which may in tum be pressed between mold halves to define a lens ( other object without an intervening gasket Alternatively, a glob of this semi-solid composition a applied at slightly elevated temperature on one side of a mold cavity. The substrate(s) and/or oi both mold halves are then brought into contact with the semi-solidified mass, which is squeezed the final desired shape by the approaching mold halves or substrates. Again, there is no need f gasketing of the assembly, as the composition will not run out of the mold due to its viscous sen solid-like nature (except that which is squeezed out in clamping the moid shut). Furthermore, th shaped mass may be kept at a slightly elevated temperature after mold closure (without loss of 1 material out of the mold) to anneal away the stresses (birefringence), if any, introduced by squeezing, before the system is exposed to a source of polymerizing energy (such as UV light o temperature) to trigger networic formation (curing). The semi-solid polymerizable materials useful in the present invention comprise a mixtu a reactive plasticizer, a polymerization initiator and, optionally, a dead polymer. The compositioi may optionally include other additives well-known in the art such as mold release agents to faci removal of the object from the mold after curing, non-reactive conventional plasticizers or flexibil pigments, dyes, tinting agents, organic or inorganic fibrous or particulate reinforcing or extending fillers, thixotropic agents, indicators, inhibitors or stabilizers (weathering or non-yellowing agents absorbers, surfactants, flow aids, chain transfer agents, anti-reflective agents, scratch-resistant additives, and the like. For the practice of the invention as disclosed herein, it is only required tt the composition (1) be highly viscous, semi-solid or solid-like for handling and/or insertion into a assembly at some temperature (i.e., non-free-flowing over the time periods required for mold filli while being semi-solid or liquid-like (i.e., deformable) at the processing temperature to which the mold assembly is heated or cooled after closure; (2) exhibit a lower viscosity than the correspon dead polymer(s) in the absence of the reactive plasticizer, and (3) be reactive such that a highei viscosity material results upon curing. Since most known material systems become more comp upon heating, the molding temperature will usually, but not necessarily, be equal to or higher the handling temperature, unless high temperatures are used to facilitate injection into the mold, in which case the mold temperature may desirably be cooler than the material temperature just prior to insertion into the mold. ,ln principle, any reactive plasticizer system (with or without dead polymer) which can be handled as a semi-solid or solid at some temperature, and which can be made to conform to a desired geometry (with or without changing the temperature and/or using force), can be used for the practice of the invention. It may be preferable to formulate the reactive semi-solid compositions of th The semi-solid materials are prepared, in one embodiment by mixing a dead polymer with a least one small-molecule species, which is itself polymerizable or crosslinkable. This small-molecule species is referred to herein as a "reactive plasticizer'. In another embodiment, the semi-solid polymerizable material comprises a reactive plasticizer or a mbcture of reactive plasticizers, without the presence of a dead polymer. The reactive plasticizer may encompass monomers, crosslinkers, oligomeric reactants, oligomeric crosslinkers, or macromeric reactants or macromeric crosslinkers (collectively macromers). The reactive plasticizers can be mixtures themselves, composed of mono-functional, bi-functional, tri-functional or other homogeneous or heterogeneous multi-functional entities (heterogeneous reactive plasticizers being those that possess two or more different types of reactive functionalities). The temn "dead polymer" as used herein and in the appended claims refers to a fully polymerized, generally non-reactive polymer. When certain polymer chemistries are used, the dead polymer may react witti a reactive plasticizer, even if the dead polymer does not have unsaturated entiues wiuiin cr attacMcd to the chsin. ■ ■ i6 usau pciymer may L’ linear cr uranci leu, ■ lornoporymer or copolymer. In the case of a copolymer, the sequence distribution may be random in sequence or bk)cky. The bk)ck copolymers may be tapered, or may have grafted side chains. The architecture o the dead polymer may be branched, multi-chain, comb-shaped or star-shaped. Di-block, tri-block or multi-bkxdt structures all fall within the scope of this invention. Thus, the semi-solid compositions of the present invention comprise one or more reactive plasticizers and a fully polymerized, solid, conventional polymer (i.e., the dead polymer). This approach greatly broadens the utility of the present invention because many different dead polymers may be incorporated into the semi-solid compositions, including dead polymers that do not pass through an intermediate, transitional semi-solid state in the course of normal manufacture. The reactive plasticizer plays a unique role in the present invention in that it simultaneously: (1) plasticizes the dead polymer to give a composition having one desired consistency at ambient temperature or below (i.e., able to maintain a shape for easy handling over short time periods) and another desired consistency at tiie processing temperature (i.e., malleable enough to be compressei or formed into a desired shape); and (2) adds or restores a polymerizable feature or character to the dead polymer. One benefit of this scheme is that the semi-solid material, which is a plasticized version the dead polymer(s) in one embodiment may be flowed and/or molded at temperatures lower th would otherwise be possible for the dead polymer alone. Since the curing of the reactive plastici typically eliminates this plasticizing effect, there is an effective hardening of the material upon ci In conventional processing, one must rely on temperature reduction for hardening of the molded polymeric parts before ejection from the mold cavity. Thus, a beneficial result of this approach c the molding and/or thermoforming of pure polymers not containing reactive plasticizers is that th demolding process can occur more quickly with tiie semi-solid materials of the present inventior because curing can be used to harden the material in the mold. Additionally, for processes that die or other device to shape a polymeric material as it is ejected from an orifice, the semi-solid materials of this invention may be beneficially hardened or solidified by inducing the curing reac at or near the point of die exit Curing of the reactive plasticizer effectively increases the "melf strength at the die exit temperature by reducing or eliminating the plasticizing effect when desire The transition will be especially pronounced when multifunctional plasticizers are used, or when significant cross-linking during cure. The processing temperature used to shape the semi-solid materials into the desired geometry can be chosen conveniently to be moderately above or be\ovf ambient temperature. > advantage of the present invention is that this processing temperature may be below that used J identical processing operations utilizing conventional dead polymers only. When the semi-solid material is cured, the reactive plasticizers set up a semi-interpenetrating polymer network within entangled dead polymer network. In some cases, the reactive plasticizer may react with groups the dead polymer chain to fomn completely crosslinked networi(s. The types and relative amounts of reactive plasticizer and dead polymer, the resulting s solkj material, and methods of making the semi-solid material are disclosed and discussed in Pi Publication No. WO/17675, the entire disclosure of which is incorporated by reference herein. In total, the amount and composition of the reactive plasticizer in the resulting formulatii such that the formulation is semi-solid-like and can be effectively handled with no need for a ga: in the mold. That is, the reactive plasticizer is present in concentratbns sufficient to allow malle and moldabiiity at the desired processing temperature and pressure; however, the mixture is no flowing at the material storage temperature, which can be conveniently chosen to be at ambienl temperatures, or slightly above or below. The amount of reactive plasticizer is generally from a 0.1% to about 100% by weight preferably from about 1% to about 50%, more preferably from s 15% to about 40%. The types and relative amounts of reactive plasticizer and dead polymer will dictate the and temperature-dependent visco-elastic properties of the mixture. The visco-elastic properties the chosen compositions may be wide and varied. The uniquely formulated materials of this inv may exist as a solid at room temperature (i.e., the glass transition temperature of the mixture m still be above room temperature, but necessarily shall be below the glass transitton temperature the pure-component dead polymer or corresponding polymer mixture or blend). Such systems require an elevated temperature to acquire the semi-solid state, much as thermoplastics are he to induce flow and facile molding operations, but shall always be discernible by plast'icization effects of the reactive plasticizers. The concept of plasticlzation and the various physical effects tiiat result in polymeric systems is described in various polymer texts. Two main plasticlzation effects are lower Tg ‘nd lower modulus (and/or viscosity) at a given temperature upon the addition of the reactive plasticizer. There are many other measurable effects as well, which are well known in the art. See, for example. Volume 48 of the Advances in Chemistry Symposia Series entitled Plasticlzation and Plasticizer Processes, 1965, American Chemical Society. Alternatively, the semi-solid compositions may be formulated to give materials that are above their glass transition temperature at ambient, thus implying that little or no heating would be required to mold the material into a desired geometry. For the practice of the invention as disclosed herein, it is only required that the composition be highly viscous, semi-solid or solid-iike for handling and/or insertion into a mold assembly at some temperature, while being semi-solid or liquid-like (i.e., deformable) at the processing temperature to which the mold assembly is heated or cooled after closure, with the additional requirement that the effects of the reactive plasticizer be discernible compared to the pure component dead polymer. If the mixture consists mostly or wholly of reactive plasticizers, it may need to be cooled or partially cured in order to achieve the semi-solid-like consistency desirable for handling. Likewise, the mokl-assembly temperature (the temperature at whbh the semi-solid compositbn is inserted into the mold) may desirably be below ambient temperature or below the material handling or injection temperature to prevent dripping or leaking from the mold prior to closure. Once the mold is closed, however, it may be compressed and heated to any pressure and temperature desired to induce conformation of the material to the intemal mold cavity, even if such temperatures and pressures effect a free-flowing composition within the mold cavity (i.e., a composition which becomes free-flowing at the molding temperature is not precluded, and may be desirably chosen for the molding of fine-featured parts in which the molding compound must fill in small cavities, channels, and the like). ■ lie CCiTipCSiiiOn iTiOsi ueSirSuic iCf iiic pfaouCe Oi ui6 inVSiiuCri witi lypiCany COnSiSl Oi SuOui 15% to about 40% of a reactive plasticizer in a dead polymer. Once combined, sakl preferable mixture should provide a composition that is semi-solid at slightly atxive room temperature, such that it may be easily handled as a discrete part or object without undue stickiness or deformability under amtnent conditions. The mixture may be more easily homogenized at an elevated temperature and discharged into discrete paris or preforms, which roughly approximate the desired shape of the final object, then cooled for handling or storage. When said preferable mixture or parts are placed into a mold and heated slightly above ambient temperature, or otherwse shaped or compressed while simultaneously heated, they will defonn into the desired geonnetry without undue resistance. Such a composition is preferable in that handling and storage may occur at room temperature, while molding or shaping into the desired geometry may occur at temperatures only slightly or moderately removed from ambient When used without a dead polymer or with only a small amount of dead polymer, the reactive plasticizer should be a reactive oligomer or a reactive short polymer, having at least one reactive functional group. In this case, the reactive plasticizer should be a tonger chain molecule, of from about 1 to about 1000 repeat units, and preferably between about 1 and at)out 100 repeat units. Inthe case of low molecular weight reactive plasticizers, the mixture may first be slightly polymei to create the semi-solid consistency required for downstream processing. Altematively, the mixt may be cooled to create the semi-solid consistency. Polymerization initiators are added to the mixture to trigger polymerization after molding Such initiators are well-known in the art Optionally, other additives may be added, such as moli release agents to facilitate removal of the object from the moid after curing, non-reactive conventional plasticizers or flexibilizers, pigments, dyes, tinting agents, organic or inorganic fibre particulate reinforcing or extending fillers, thixotropic agents, indicators. Inhibitors or stabilizers (weathering or non-yellowing agents), UV absorbers, surfactants, flow aids, chain transfer agent anti-reflective agents, scratch-resistant additives, and tiie like. The initiator and other optional additives may be dissolved in the reactive plasticizer component prior to combining with the dea polymer to facilitate complete dissolution into and uniform mixing with the dead polymer. Altematively, the initiator and other optional additives may be added to the mixture just prior to polymerization, which may be preferred when thermal initiators are used. The ingredients in the semi-solid polymerizing mixture can be blended by hand or by mechanical mixing. The ingredients can preferably be warmed slightly to soften the dead polym( component Any suitable mixing device may be used to mechanically homogenize the mixture,: as blenders, kneaders, extruders, mills, in-line mixers, static mixers, and the like, optionally blen at temperatures above ambient temperature, or optionally blended at pressures above or below atmospheric pressure. An optional waiting period may be allowed during which the ingredients are not mechan agitated. The optional waiting period may take place between the time the ingredients are initial metered into a holding container and the time at vi’ich they are homogenized mechanically or manually. Altematively, the ingredients may be metered into a mixing device, said mixing devio operated for a sufficient period to dry-blend the ingredients, then an optional waiting period may ensue before further mixing takes place. The waiting period may extend for an hour to one or rr days. The waiting period may be chosen empirically and without undue experimentation as the period that gives the most efficient overall mixing process in terms of energy consumption. This be particulariy beneficial when the polymerizable mixture contains a high fraction of the dead pa ingredient especially when the dead polymer is glassy or rigid at ambient temperatures. Utilizai of a waiting period may also be particulariy beneficial when the dead polymer is thenmally sensil and so cannot be processed over an extended time at temperatures above its softening point wi undue degradation. Preferred semi-solid compositions in connection with the present invention are those wf are compatible with the substrate material(s) chosen to interface with the semi-solid. Such compatibility and processing conditions should be chosen such that no phase separation, crystallization, or clouding occurs at the interface between the semi-solid and the substrate mati Such factors will primarily be determined by the reactive plasticizers incorporated into the semi-as opposed to the types and amounts of any dead polymer used. Preferable superstrate compositions are ones in which the reactive plasticizers used in the semi-solid material are able to diffuse into the substrate material or are at least not incompatible with the substrate material. While not wishing to be bound by theory, it is t>eiieved that such behavior facilitates adhesion between the semi-solid and the substrate by forming a gradient material in which the chemical composition changes gradually upon moving across the interface from the semi-solid superstrate into the substrate material. Upon curing of the semi-solid/substrate sandwich, such gradient materials form an integral monolithic entity; that is, they exhibit integral substrate-semi-solid compositions with somewhat non-distinct internees, rather than the abrupt compositional changes seen at the interface of conventional coatings, for example. When using polycarbonate substrates, it may be beneficial to use, as the reactive plasticizer, tetrahydrofurfural acrylate, benzyl (meth)acrylate, isobomyl (meth)acrylate, bisphenol A di(meth)acrylates (including their ethoxylated, propoxylated, and other similar versions), certain urethane acrylates, or other reactive species which may be found to exhibit a limited compatibility with polycart)onate. These above-mentioned reactive plasticizers show sufficient compatibility with polycarbonate to form strongly adhered layers when a semi-solid containing these reactive plasticizers is combined with a polycarbonate substrate. Selection of the semi-solid composition will depend on the subsbBte material to be used, as well as the desired final properties and configuration of ttie final composite lens or other article, but such selection may be achieved by those skilled in the art by known methods witiiout undue experimentation. Other preferable semi-solid compositions may be those that are formulated to possess a similar refractive index to the substrates used in accordance with this invention. Matching the refractive index between the semi-solid and subsb’te materials to witiiin about 0.05 units of the refractive index will usually minimize any optical atierrations or other interface effects that might exist between the two materials. Alternatively, the semi-solid composition may be formulated to provide the highest cr lowest refrsctive indices pcssibis. High rsfrsctive indsx fcrmuiaticris may be used, for example, to maximize the optical corrective power for a given thickness of lens (where the thickness is determined by, among other things, the difference in radii of curvature between the front and back surfaces). Low refractive index formulations may be desirable, for example, to decrease the amount of light reflected from the front or back surface of a lens. A wkJe formulation latitude is made possible by the semi-solid compositions disclosed by this invention, and such latitude may be advantageously used to provide materials having a desired refractive index. Another advantage of tiie semi-solid materials disclosed by this invention is that the semi¬solid materials display low shrinkage upon cure. By 'low shrinkage' is meant that the shrinkage of the composition of the invention upon cure will typically be less ttian about 8%, preferably less than about 5%. This benefit enables molding processes in which the fabricated part shows high replication fidelity of tiie mold cavity. In other words, because the polymerizable fonmulation shrinks very litUe upon cure (typically less than 8%, more preferably less than 5%), the cured part will maintain the shape of ttie mold cavity throughout cure and after demolding. Problems associated with shrinkage, such as warpage and premature mold release, which greatly hinder and complicate current state-of-the-art casting practices, are eliminated. In addition, the finished sandwich structure will have little residual stress. This high replication fidelity is particularly desirable in the formatic optical components that rely on precise, smooth surfaces, such as ophthalmic lenses. The shrinkage issue is particularly important with respect to the fabrication of a sandwic composite lens as disclosed herein because the shrinkage associated with conventional curing pure monomers (e.g., bisallyl carbonates, acrylates, methacrylates, etc., wfiich shrink by up to 1 can lead to warpage of the substrate material being used, especially when the resin is only appi one side of the substrate or when the substrate is relatively thin. The resultant article will often t bowed or warped in the direction of the cured resin. Also, such shrinkage causes a stress gradi the interface of the cured resin and the substrate material. Such stress gradients, aside from producing the warpage mentioned, also lead to adhesion, delamination, and durability problems composite lenses formed from liquid resins cured on the surface of the substrate. The semi-solii material of the present invention is distinctly different from monomeric coatings disclosed in the art in that the shrinkage is greatly reduced by the semi-solid compositions, thereby eliminating t! warpage, adhesion, delamination, and durability problems encountered previously with pure monomeric resins. The semi-solid material may be fomnulated to be rubbery, flexible, hard, impact-resistan scratch-resistant, etc., as desired for the chosen substrate-superstrate configuration. By coating or exposing the semi-solid pre-form to additional surface-fomning or surface-modifying reactive plasticizers prior to polymerization, a gradient material may be formed, as disclosed in PCT Publication No. WO 00/55653, the entire disclosure of which is incorporated h by reference. In this manner, a rubbery or flexible 'layer* or region may be incorporated specific at the interface between the cured resin and the substrate material, for example. Such a gradie material may t>e used, for example, to accommodate and relieve any residual stress between th cured resin material and the substrate, yielding a composite lens with materials that are strongly bound to each other and not prone to delamination. Likewise, the semi-solid pre-form may be £ such that the final product is rendered hard or scratch-resistant near and at any outer surface b: absorbing or otherwise applying or adding a surface-modifying composition containing a scratcl resistant material to such regions or areas of the pre-form where altered properties are desired, another example, the surface composition may be a dye or pigment solution, which dye or pignr may t>e, for purposes of illustration, photochromic, fluorescent, UV-absorbing, or visible (color). The semi-solid polymerizable material may be exposed to the surface-fonning/modifyin compositions by dipping the semi-solid into a bath of the surface material. Or, the surface mate may be vaporized on, painted on, sprayed on, spun on, printed on, or transferred onto the semi preforms by processes known to those skilled in the art of coating and pattem creation/transfer. Mematively, the surface-fomning/modifying composition may t>e sprayed, painted, printed, patt is cured completely. In other instances, the surface-forming/mod'ifying composition is itself polymerizable and forms an interpenetrating polymer network stnjcture with the semi-solid preform when the two compositions are cured. In either case, the surface treatment is locked in, either phemically, physically, or both, giving a final product where the surface and the interior compositions of the cured resin layer are different and yet the surface and the interior are integral and monolithic. Surface-forming materials for the purpose of scratch resistance enhancement can be selected from multi-functional crosslinkers that are compatible with the reactive plasticizers of the sem'Hsolid polymerizable composition, so that they will react together to form the monolithk: final product By "compatible" in this sense is meant that the surface formulation may preferably inter-react with the reactive groups present in the semi-solid composition. Formulations used for imparting scratch resistance will often consist of one or more highly functbnai (i.e., functionality equal to or greater than 3) reactive species. Polymerization of such highly functional species in the near-surface region of the composite article will produce a tightly crosslinked, scratch-resistant outer layer that is monoiithically integrated with the cured resin layer. Examples of such crosslinkers include, but are rK>t limited to, triacrylates and tetraacrylates, and the ethoxylated or propoxylated versions of these multi-functional acrylates. Occluded nano-particles in the surface formulatk>n can also impart exceptkinal scratch resistance. Those skilled in the art of nano-composites can readily adapt the present invention for use with the nano-composite literature. Photochromic dyes useful as the surface-forming material are discussed in the following references: "Organic Photochromes", A.V. Elstsov, ed.. Consultants Bureau Publishers, New York and London, 1990; "Physics and Chemistry of Photochromic Glasses", A.V. Dotsenko, L.B. Glebor, and V.A. Tsekhomsky, CRC Press, Baton Rouge and New Yorit, 1998; "Photo-Reactive Materials for Ultrahigh Density Optteal Memory", M. Irie, ed., Elsevier, Amsterdam and New York, 1994. The dyes may themseh/es possess reactive groups that chemically lock them into the near-surface region of u~’ ‘\m.'.’.m’ .. *u» .J..-.. »_.. 1’.,. ._&:—■.. :—.....& i_ u— i.u.— .......— Ai— -I...... ...Ill I— 1.’1’ :. «.t— -x.’’’ uiB uufcui, ui uic uyes may uc ciiuieiy iiiBii. in iiics laiiei oaac, uic uyea win uc iiciu ill uie suiidue Fegk)n of the object by the densely crosslinked network surrounding the dye molecules after polymerization. The process of the present invention allows the choice of dyes for tinting to be greatly expanded over that of the prior art methods. Dyes sensitive to thermal degradation may be utilized as the surface-forming composition, as may dyes that dissolve in organic media. Many commercially available dyes from sources such as Ciba Geigy, Aldrich, BASF, DuPont, eto., are soluble in organk: media. Aqueous-phase soluble dyes are also possible candidates for this inventkin by using surface formulations that are polar or charged, or simply by dissolving the dyes in an inert, polar media (e.g., water, ethanol, ethylene glycol, acetone, etc.), which facilitates their uptake into the article prior to cure. Low refractive-index monomers and crosslinkers may t>e used as the surface-forming composition to provide, for example, low reflectivity (for anti-glare applications, for example). Such compositions include vinyl or (meth)acrylated silrcones, as well as perfluorinated or partially fluorinated acrylates and methacrylates and vinyl ethers, such as for example vinyl trifluoroacetate, trifluoroettiyl acrylate, pentadecafluorooctyl acrylate, hexafluorobutyl mettiacrylate, perfluonsethyleneglycol diacryiate, and the like. These perfluorinated compounds may also enh mold-release properties of the final pnsduct, as do silicone acrylates. Anti-static monomers or inert additives may be used as the surface-forming compos'itior provide anti-static-charge surfaces in the composite lens. The anti-static surfaces minimize the collection of dust particles, increasing optical transmission and clarity and decreasing the need i frequency of cleanings. Reactive and inert anti-static additives are well known and well enumer in the literature. Heterofunctional additives may be used as the surface-forming composition for incorpor into the near-surface region of the semi-solid composite article. These heterfunctional additives then serve as future reactive sites or as adhesion promoters for subsequent films or coatings. F example, mono-acrylated epoxies, hydroxyacrylates, amino-vinyl ethers, or vinyl anhydrides ma chemically incorporated into the surface region(s) of the composite article by reaction of the vin’ groups. The epoxy, hydroxy, amino, or anhydride groups may then be used to capture, react w\ and/or promote adhesion of subsequent films or coatings using chemical reactions other than th vinyl-based polymerization. EXAMPLES Two example process schemes for preparation of the semi-solid compositions are disci below. Numerous variants can be envisioned by those skilled in the art of polymerization reactii engineering and polymer processing and molding. Hence, the present invention is not limited b; these two example processing embodiments. Batchwise processing provides precision-casting from preforms. A dead polymer, a rea piasticizer, and an initiator package (optionally including other additives such as anti-oxidants, stabilizers, and the like) are mixed together (optionally with a waiting period during which the ingredients are not mechanically agitated) in a mixer equipped with temperature control and vac capabilities, to fonm a semi-solid polymerizable composition free of voids or air bubbles. The se solid composition is discharged from the mbcer, and the discharge is cast into slabs (disks, puck balls, buttons, sheets, and the like), which serve as pre-forms for the subsequent preparation of composite articles of the present invention. Alternatively, an extruded strand of the semi-solid composition can be sliced or diced into pre-forms. In a downstream operation, the pre-forms (w may be stored at room temperature or refrigerated temperatures in the interim, or whrch may ev partially cured to facilitate handling and storage) are retrieved, placed together with at least one substrate into a mold, shaped, and cured via exposure to a source of polymerizing energy, into desired geometry to produce the final composite optical lens article. In a presently preferred embodiment, the preforms are sandwiched between mold halves, whereupon the mold is closec briefly heated to enhance material compliance as necessary, and flood-exposed by UV or heat-cured. In an alternative, continuous process, the dead polymer, the reactive piasticizer, and thi initiator package (optionally including other additives such as anti-oxidants, stabilizers, and the I are mixed together in an extruder. There is optionally a waiting period prior to the material bein introduced into the extruder, during which time the ingredients are in intimate contact with one another, but are not mechanically agitated. Periodically, the extruder discharges a fixed amount of semi-solid reactive plasticizer-dead polymer composition as a warm glob into a temperature-controlled mold cavity containing a substrate. The mold, which exhibits a telescopic fit of the front/back mold assembly, is then closed. An optional waiting period may ensue at the still-elevated temperature to anneal any stresses induced by squeezing of the glob. Finally, the captured material is exposed to a source of polymerizing energy. Material Design Considerations The semi-solid polymerizable compositions comprise the combination of dead polymers with monomeric or oligomeric reactive diluente. These reactive diluents, when used in small amounts, actually serve the role of plasticizers. Instead of inert plasticizers that simply remain in a plastic to soften the material, the reactive diluents/plasticizers can initially soften the polymer to facilitate the molding process (allowing for lower temperature molding processes compared with the processing of conventional, unplasticized thennoplastic materials); but upon curing, the polymerized reactive plasticizers lock in the precise shape and morphology of tiie polymer (and also lock in tiie reactive plastidzers themselves so that they cannot leak or be leached out of the material over time). Once polymerized, the reacted plasticizers no longer soften the dead polymer to the same extent as before curing. The hardness of the cured part will be detemnined by the chemical stixicture and functionality of the reactive plasticizers and the dead polymers used, Uieir concentration, molecular weight, and tiie degree of crosslinking and grafting to the dead polymer chains. Additionally, chain-terminating agents can be added to the fonnulation prior to polymerization in order to limit the molecular weight and degree of crosslinking of the polymer formed by reacting the plasticizers, thus adding a measure of conb'ol in altering the final mechanical properties of the cured parts. At the same time polymerization results in no significant shrinkage (due to the overall low concentration of the reactive piasticizer or the iow population of reactive entities), so the finished objects remain dimensionally stable, yielding high fidelity replication of the mold cavity. Precise geometaic replication of the mold cavity is further preserved due to the relatively low molding temperatures and reduced exotherm from polymerization. Subsequent discussions conceming the basic material design considerations are divided into two categories based on the type of dead polymer utilized in the process. One category begins witii standard thermoplastics as the dead polymer. These include, but are not limited to, polystyrene, polymethylmethacrylate, poly(acrylonitrile-butadiene-styrene), polyvinyl chloride, polycartx)nate, polysulfbne, polyvinylpyrrolidone, polycaprolactone, and polyetherimide, for example. The thermoplastics may optionally have small amounts of reactive entities attached (copolymerized, grafted, or otherwise incorporated) to the polymer backbone to promote crosslinking upon cure. They may be amorphous or crystalline. They may be classified as engineering thermoplastics, or tiiey may be biodegradable. These examples are not meant to limit the scope of compositions possible during the practice of the current inventbn, but merely to illustrate the broad selection of thennoplastic chemistries permitted under tiie present disclosure. Reactive plasticizers may be mixed with a thermoplastic polymer such as those listed above to give a semi-solkl-like composition that can tje easily molded into dimensionally precise objects. Upon curing, the dimensional stat of the object is loci’ed in to give exact three-dimensional shapes or precise surface features. Themnoplastic polymers may be chosen in order to give optica! clarity, high index of refraction. I The other category utilizes "thermoplastic elastomers" as the dead polymer. An exempi thermoplastic elastomer is a tri-biock copolymer of the general structure *A-B-A", where A is a thermoplastic rigid polymer (i.e., having a glass transition temperature above ambient) and B is. eiastomeric (rubbery) polymer (glass transition temperature below ambient). In the pure state, / forms a microphase-separated morphology. This morphology consists of rigid glassy polymer regions (A) connected and surrounded by rubbery chains (B), or occlusions of the rubbery phasi surrounded by a glassy (A) continuous phase, depending on the relative amounts of (A) and (B) the polymer. Under certain compositional and processing conditions, the morphology is such th relevant domain size is smaller than the wavelength of visible light Hence, parts made of such copolymers can be transparent or at worst translucent Thermoplastic elastomers, without vulcanization, have rubber-like properties similar to those of conventional rubber vulcanizates, b flow as thermoplastics at temperatures above the glass transition point of the glassy polymer rei Melt behavior with respect to shear and elongation is similar to that of conventional thermoplast Commercially important thermoplastic elastomers are exemplified by SBS, SIS, SEBS, where S polystyrene and B is polybutadiene, I is polyisoprene, and EB is ethylenebutylene copolymer. N other di-block or tri-block candidates are known, such as poly(aromatic amide)-siloxane, polyimi siloxane, and polyurethanes. SBS and hydrogenated SBS (i.e., SEBS) are well-known product Shell Chemk:als (Kraton*). DuPont's Lycra* is also a block copolymer. When thermoplastic elastomers are chosen as the starting dead polymer for formulatior exceptionally impact-resistant parts may be manufactured by mixing with reactive plasticizers. thermoplastic elastomers, by themselves, are not chemically crosslinked and require relatively i temperature processing steps for molding which, upon cooling, leads to dimensionally unstable, shrunken or warped parts. The reactive plasticizers, if cured by themselves, may be chosen to a relatively glassy, rigid networic, or may be chosen to form a relatively soft, rubt)ery network, bi relatively high shrinkage. When thermoplastic elastomers and reactive plasticizers are blended together, they form flexible networtcs with superior shock-absoriiing and impact-resistant proper By 'impact-resistant' is meant resistance to fracture or shattering upon being struck by an inck)( object Depending on the nature of the dead polymer and reactive plasticizers used in the fonnulation, the final cured material may be more stiff or more stretchy than the starting dead polymer. Composite articles exhibiting exceptional toughness may be fabricated by using a thermoplastic elastomer which itself contains polymerizable groups along the polymer chain, su SBS tri-block copolymers, for example. Furthermore, when compatible systems are identified, transparent objects can be cast "Compatibility" refers to the thermodynamic state where the dead polymer is solvated by the res plasticizers. Hence, molecular segments with structural similarity would promote mutual dissolution. Aromatic moieties on the polymer generally dissolve in aromatic plasticizers, and vice versa. Hydrophilicity and hydrophobicity are additional considerations in choosing the reactive plasticizers tc , mix with a given dead polymer. Even when only partial compatibility is observed at room temperature, the mixture often becomes uniform at a slightly increased temperature; i.e., many systems t>ecome clear at slightly elevated temperatures. Such temperatures may be slightly above ambient temperatures or may extend up to the vicinity of 100 "C. In such cases, the reactive components can be quickly cured at the elevated temperature to "lock-in* the compatible morphology before system cool-down. Hence, both material and processing approaches can be exploited to produce optically clear parts. Optically clear and dimensionally exact parts have a wide range of potential applications. Both polycarbonate and thermoplastic elastomers can be employed to create useful formulatk>ns by mixing with suitable reactive plasticizer packages. With the process innovation described herewith, powerful new material systems can t>e developed. A preferred formulation for developing optically clear and high impact-resistant materials uses cyclo-olefin polymers and/or cyclo-olefin copolymers (polyolefins) such as the cyclo-olefin Zeonor from Zeon Chemicals as a dead polymer. Formulations based on one or more of the Zeonor grades (1020R, 1060R, 1420R, 1600, etc.) exhibit excellent optical properties, impact resistance, thermal stability, good hardness, low water absorption, and low density (approximately 1.01 g/cc for the pure polymer). Another preferred formulation for developing optically clear and high impact-resistant materials uses styrene-rich SBS tri-block copolymers ttiat contain up to about 75 % styrene. These SBS copolymers are commercially available from Shell Chemicals (Kraton*), Phillips Chemical Co. (K-Resin*), BASF (Styrolux*), Fina Chemicals (Finaclear*), and Asahi Chemical (Asaflex*). In addition to high impact resistance and good optical clarity, such styrene-rich copolymers yield mausnSiS SySicmS wiiiCii prStSrSuiy eXuiuu CuiSr ueSirSuic propel ucS auCii 55 iiiyii reiiai.rUVB inucA (that is, the index of refraction is greater than 1.499) and tow density. When the mixture refractive index is an especially important consideration, high refractive index polymers may be used as one or more of the dead-polymer components. Examples of such polymers include polycarbonates and hak)genated polycarbonates; polystyrenes and halogenated polystyrenes; polystyrene-polybutadiene bkxd( copolymers and their hydrogenated and hak>genated versions (all of which may be linear, branched, star-shaped, or non-symmetrically branched or star-shaped); polystyrene-polyisoprene bkxk copolymers and their hydrodrogenated and hatogenated versions (including tiie linear, branched, star-shaped, and non-symmetrical branched and star-shaped variations); poly(penta-bromophenyl (meth)acrylate); polyvinyl carbazole; polyvinyl naphthalene; polyvinyl biphenyl; polynaphthyl (metti)acrylate; polyvinyl thiophene; polysulfones; polyphenylene sulfides; urea-, phenol-, or naphthyl-fbmialdehyde resins; polyvinyl phenol; chlorinated or brominated polystyrenes; poly(phenyl a- or p-bromoacrylate); polyvinylidene chloride or bromide; and the like. In general, increasing the aromatic content sulfur content, and/or hak>gen content (especially bromine) are effective means well-known in the art for increasing the refractive index of a material. These pro- perties are especially preferred for ophthalmic lenses as it enables the production of ultra thin, lig weight eyeglass lenses which are desirable for low-profile appearances and comfort of the wean Alternatively, elastomers, themnosets (e.g., epoxies, melamines, acrylated epoxies, aery urethanes, etc., in their uncured state), and other non-thermoplastic polymeric compositions ma> desirably utilized during the practice of this invention. Mixtures of such materials may also be t)eneficially used to create dimensionally stable | with desirable properties. For example, impact modifiers may be blended into various thenmopla! or thermoplastic elastomers to improve the impact strength of such material systems. In such ca the presence of the reactive plasticizers will fadlitate blending by lowering the softening tempera of tiie polymers to be blended. This is especially beneficial when a temperature-sensitive materij being blended with a high-T, polymer. When optically clear materials are desired, the mixture components may be chosen to have the same refractive index (iso-refractive) such that light scattering is reduced. When iso-refractive components are not available, the reactive plasticizen may also help reduce the domain size between two immiscible polymers to below the wavelengt light, thus producing an optically clear polymer mixture, which would have otherwise been opaqi The reactive diluents (plasticizers) can be used singly or, altematively, mixtures can t>e i to facilitate dissolution of a given dead polymer. The reactive functional group can be acrylate, methacryiate, acrylic anhydride, acrylamide, vinyl, vinyl ether, vinyl ester, vinyl halide, vinyl silan to those which exist as liquids at ambient temperatures or slightly above, and which polymerize readily with the application of a source of polymerizing energy such as light or heat in the preser a suitable initiator. Reactive monomers, oligomers, and crosslinkers that contain acrylate or methacryiate functional groups are well known and commercially available from Sartomer, Radcure and Henk Similariy, vinyl ethers are commercially available from Allied Signal. Radcure also supplies UV curable cydoaliphatic epoxy resins. Photo-initiators such as the Irgacure and Darocur series an well-known and commercially available from Ciba Geigy, as is the Esacure series from Sartome Thennal initiators such as azobisisobutyron'itrile (AIBN), benzoyl peroxide, dicumyl peroxide, t-b hydroperoxide, and potassium persulfate are also well known and are available from chemical suppliers such as Aldrich. Vinyl, diene, and allyl compounds are available from a large number chemical suppliers, as is benzophenone. For a reference on initiators, see, for example, Polymi Handbook, J. Brandrup, E.H. Immergut, eds., 3"' Ed., Wiley, New Yori The compatibility of dead polymer-reactive plasticizer mixtures is demonsb’ted by checking the optical transparency of the resulting material at room temperature or slightly above, as illustrated by Example 1 below. To demonsti’te the great diversity of reactive plasticizers tiiat can be used to achieve such compatibility, we will name only a few from a list of hundreds to thousands of commercially available compounds. For example, mono-functional entities include, but are not limited to: isodecyl acrylate, hexadecyl acrylate, stearyl acrylate, isobomyl acrylate, vinyl benzoate, tebBhydrofurfuryl acrylate (or methacrylate), caprolactone acrylate, cyclohexyl acrylate, methyl methacrylate, ethyl acryiate, propyl acrylate, and butyl acrylate, etc. Bi-functional entities include, but are not fimited to: polyethyleneglycol diacrylate, polypropyleneglycol diacrylate, hexanediol diacrylate, Photomer 4200 (from Henkel), poiybutadiene diacrylate (or dimethacrylate), Ebecryl 8402 (from Radcure), bisphenol A diacrylate, etiioxylated (or propoxylated) bisphenol A diacrylate. Tri-functional and multi-functional entities include, but are not limited to: toimetiiylolpropane blacrylate (and its ethoxylated or propoxylated derivatives), pentaerythritol tetraacrylate (and its ethoxylated or propoxylated derivatives), Photomer 6173 (a proprietary acrylated oligomer of mutti functionality, from Henkel), and a whole host of aliphatic and aromatic acrylated oligomers from Sartomer (the SR series), Radcure (the Ebecryl series), and Henkel (the Photomer series). When high refractive index materials are desired, the reactive plasticizers may be chosen accordingly to have high refractive indices. Examples of such reactive plasticizers, in addition to those mentioned above, include brominated or chlorinated phenyl (meth)acrylates (e.g., pentabromo methacrylate, tribromo acrylate, etc.), brominated or chlorinated naphthyl or biphenyl (meth)acrylates, brominated or chlorinated styrenes, tribromoneopentyl (meth)acrylate, vinyl naphthylene, vinyl biphenyl, vinyl phenol, vinyl carbazole, vinyl bromide or chloride, vinylidene bromide or chloride, bromoethyl (meth)acrylate, bromophenyl isocyanate, etc. The foltowing examples are provided to illustrate the practice of the present invention, and cue intended neiiiiei io define nor iu limit the scope of the invenaoii in any niariner. The Examples 1 to 8 below are designed to discover pairs of materials that exhibit Oiermodynamic compatibility prior to polymerization. Examples 9 to 11 show systems that remain optically clear upon photocuring, and further illusbBte material systems exhibiting high refractive Indices. Tertiary, quaternary, and multi-component mixtures can be formulated based on knowledge gleaned from t>inary experiments. Generally, diluents that are small molecules have a higher degree of shrinkage. But, they are also typically better plasticizers. On the contrary, oligomeric plasticizers shrink less, but they also show less solvation power and less viscosity reduction. Hence, mixtures of reactive plasticizers can be prepared to give optimized compatibility, processing, and shrinkage properties. Examples 12 to 17 provide exemplary composite lenses which may be prepared according to this invention. Example 1. Experimental Protocol Dead polymers are added to a vial, pre-filled with a small quantity of the intended reactive plasticizer. Gentie heating is applied while stining homogenizes Vne mixture. The resulting semi-solkl-like mass is observed visually and optical transparency at various temperatures is recorded. Complete clarity is indicative of component miscibility. A faint haze suggests partial miscibility, z opacity equates to incompatibility (light scattering as a result of phase separation). Many pairs c dead polymer-reactive plasticizers can thus be investigated. Examples 2 to 8 report several findings of system compatibility and partial compatibility, following this procedure. Example 2. Kraton-Based Systems The folJowng polymers were studied using the protocol described in Example 1. The accompanying table summarizes the polymer characteristics. TABLE 1 Krayton type Composition (%) Description G1652 SEBS{S:29/EB:71) linear, low molecular weight G1650 SEBS{S:29/EB:71) linear, medium Mw G1657 SEBS(S:13/EB:87) linear D1102 SBS (S:28 / B:72) linear, low Mw D4141 SBS (S:31 / B:69) linear D 4240P (SB)n (S:44 / B:56) branched D1116 (SB)„ (S:21 / 8:79) branched D1107 SIS (S:14 /1:86) linear S = styrene, EB = ethylene butylene, B = butadiene, I = isoprene Hexanediol diacrylate solvates all Kraton samples well except for G 1650, virhich shows partial miscibility. Photomer 4200 solvates D1102. D1107, D4141, D4240p, and G1657 at elevi temperatures. Photomer 4200 (an oiigomeric diacrylate) solvates G 1652 partially. Polybutadie dimethacrylate (SartomerCN301) solvates D1116, D1102, and D4141 partially at elevated temperatures. Ebecryl 8402 solvates G 1657. Isodecyl acrylate is compatible with all of the ab( Kratons. Hexadecyl acrylate, lauryl acrylate, and stearyl acrylate solvate Kraton at elevated temperatures. Other monomers tiiat solvate Kraton include butyl acrylate, isooctyl acrylate, isobomyl acrylate, benzyl acrylate, teb’hydrofurfuryl acrylate, and vinyl benzoate. In general, aliphatic acrylates solvate mbbery Kraton well. Ethoxylated bisphenol A diacrylate (average molecular v of 424) solvates Kraton D4240p, D1107, D4141, and D1102 only slightiy. Example 3. Styrene-Rich SBS Systems Kraton D1401P is a linear styrene-rich SBS tri-block copolymer. Reactive plasticizers t solvate Kraton D1401P include: vinyl benzoate; tetrahydrofurfuryl acrylate; benzyl (metti)acrylai isobomyl (meth)acrylate; butyl acrylate; octyi acrylate; isodecyl acrylate; butanediol diacrylate; hexanediol diacrylate; ethoxylated bisphenol A diacrylate; and trimethylolpropane triacrylate. Si containing monomers such as phenylthioethyl acrylate and others also solvate SBS-based poly well. A further benefit of the sulfur-containing monomers is that their incorporation results in a higher Abbe numt>er of the cured resin. To obtain thermodynamically compatible systems containing styrene-rich SBS tri-block copolyiTjers, Kraton D1401P can be replaced by other SBS copolymers such as those that are commercially available from Phillips Chemical Company (K-Resin), BASF (Styrolux). Fina Chemicals (Finaclear), and Asahi Chemical (Asaflex). Example 4. PMMA-Based Systems This study is conducted with a polymethyl methacrylate (PMMA) sample of molecular weight 25,000. Many reactive plasticizers have been found compatible with PMMA. These are: Photomer 4200; Photomer 6173; many alkoxyiated multifunctional acrylate esters, such as propoxylated glycerol triacrylate; urethane acrylates, such as Ebecryi 8402 (aliphatic) and Ebecryl 4827, 4849 and 6700 (aromatic); tetrahydrofurfuryi acrylate; benzyl acrylate; butyl acrylate; butanediol diacrylate; hexanedid diacrylate; octyldecyl acrylate; isobomyl acrylate; and ethoxylated bisphenol A diacrylate. Example 5. Polystyrene-Based Systems Acrylated plasticizers that solvate polystyrene include Photomer 4200, tetrahydrofurfuryi acrylate, isodecyl acrylate. Bisphenol A diacrylate, hexadecyl acrylate, and stearyl acrylate exhibit compatibility at elevated temperatures (approximately 100 °C for example). Example 6. Polycarbonate-Based Systems Bisphenol A diacrylate, alkoxyiated bisphenol A diacrylate, cycloaliphatic epoxy resin, N-vinyl-2-pyrrolidinone, and teti’hydrofurfuryl acrylate, among otiiers, have t>een found useful for the solvation of polycartxanate at elevated temperature. Several aromatic urethane acrylates can be MiiXSu Vr>ui uiS Gii.>uvc \«uiii|A/uiiu9 vj aivj uic uuiii’’auL/iiiiy ui uic iily■ cuioilis. Example 7. ARTON-Based Systems Reactive plasticizers that solvate ARTON FX4727T1 (JSR Corporation) are: benzyl acrylate; isobomyl acrylate; isobomyl methacrylate; butyl acrylate; octyl acrylate; isooctyl acrylate; isodecyl acrylate; lauryl acrylate; behenyl acrylate. Aliphatic acrylates solvate ARTON very well. Example 8. ZEONEX-Based Systems OctyWecyl acrylate, butyl acrylate, and isooctyl acrylate solvate Zeonex 480R (Nippon Zeon Co., Ltd). Isobomyl (meth)acrylate solvates Zeonex 480R and E48R, and Zeonor 1420R, 1020R anc 1600R. Lauryl acrylate and behenyl acrylate solvate ZEONEX 480R and E48R at elevated temperature. Additional multifunctional acrylates that can be added to a mixture of monomers include hexanediol diacrylate, dodecanediol dimetiiacrylate, and b1cyclo[5.2.1.0(2,6)] decanedimethanol diacrylate. Example 9. Transparent Photo-cured Systems Mixtures containing the dead polymer, reactive plasticizer, and photoinitiator were mixec the protocol described in Example 1. The amount of reactive plasticizer was typically 3% to 25"/! the photoinitiator was 1% to 5% by weight Example photoinitiators include Esacure KT046 fron Sartomer and Irgacure 184 from Ciba Geigy. The resulting semi-solid composition was slightly heated (less than or equal to about 10 "C), pressed between flat glass plates, and flood-exposed by UV light Rapid polymerization wa observed that led to a clear and solid-like material. The examples of transparent photo-cured systems included: Kraton D140 IP-based sysl reported by Example 3; PMMA-based systems reported by Example 4; ARTON-based systems reported by Example 7. Kraton D1401P-based systems also showed exceptional impact-resists Example 10. Transparent Photo-cured Systems Having a High Refractive Index A mixture containing a dead polymer, reactive plasticizer, and photoinitiator was mixed I the protocol described in Example 1, and was processed further as described in Example 9. Th dead polymer was Kraton D1401P and the reactive plasticizer was benzyl acrylate, mixed at a n by weight of 88/12. Irgacure 184 was added to the mixture at 2 vtrt% based on the overall weigh the system. Upon UV cure, a flat sample having a thickness of 2.4 millimeters was produced, w showed 88% light transmittance at a wavelength of 700 nm. The refractive index of the cured sample was 1.578 at the sodium D line at room temperature. Example 11. Transparent Systems Utilizing a Waiting Period and Compression Molding A styrene-butadiene-styrene block copolymer, K-Resin KR03-NW (Chevron-Phillips Chemk’l Company, Bartlesville, Oklahoma) was physically mixed with a styrene-methyl methacryiate copolymer, NAS-21 (Nova Chemicals of Chesapeake, Virginia) at a weight ratio o 30:70. The polymers and a monomer mixture were added into a vial at a weight ratio of 80:20. 7 monomer mixture consisted of a 9:1 blend of benzyl methacryiate ("BMA") and ethoxylated bisp A dimethacrylate (1 degree of ethoxylation). The capped vial was allowed to sit in a convection i at 70 "C for one week, after which an initiator (Darocur 1173 from Ciba Geigy) was added to thi mixture at 0.5 wt% (based on the overall weight of the system), and was dissolved into the syst To mold the sample into a defect-free disc shape, approximately 5 grams of the semi-s( mixture was placed in the middle of a gasket (gasket type AS568A, dash #222 from McMaster- cure the semi-solid disc. The UV light source was a Blak-Ray Model B 100AP Longwave Ultraviolet Lamp, with flood bulb (UVP, Upland, California). After about 10 minutes of curing, the sample and plates were removed from the hotplate and allowed to cool to room temperature. The sample was tfien removed from the plates, yielding a disc-shaped cured resin exhibiting good light transmission and a shore D hardness measurement in the range of 83-84. Example 12. Semi-solid Preform for Composite Lens About 0.36g BMA and 0.04g ettioxylated Bisphenol A Dimethacrylate ("BisADMA" - SR348 from Sartomer) were mixed in a vial. 1.6 Grams of a 30:70 blend of K-Resin KR03-NW and NAS-21 were added to ‘e vial, and the mixture was stin'ed such that all the polymer particles were covered with the reactive plasticizers. The final composition in the vial was: 80 wt% polymer and 20 wt% reactive ptastk:izer. Many vials were prepared in this manner, capped, and placed in an oven at 70 'C and left for several days to one week in order to allow for the plasticizers to solvate the polymer. After this period, the mixture was removed from the vials and homogenized by mixing with a spatula on a hot plate at 150 °C. Approximately 1 wt% of Oie photoin'itiator Darocur 1173 (Ciba Geigy) was added and mixed into the semi-solid system. Approximately 18g of material mixed in the manner described above was transferred onto a Teflon sheet (100mm x 100mm) that was resting on a stainless steel tile (150mm x 150mm). A 3-inch inner diameter, 5-mm thick steel shim was placed around the sample, inside of which was a 2.25* inner diameter, 3/16* thick Buna-N o-ring. The sample was then sandwiched by placing another Teflon sheet on top of it followed by another stainless steel tile. All of these parts are available from McMaster-Carr Supply Company. The steel tiles were then placed in a Carver hydraulic press (model # 3912), fitted with heated platens that were set to 240 "F. 5000 Pounds force was applied to the sample for 10 minutes, after which it was cooled down to 60 "F by running water through the COOiiny C’iwineSs in the platens. The pressure was feieased, and a seitii-soiid pOiymef disc was renDoved from the tiles measuring approximately 70 mm diameter and 5 mm thk’. Example 13. A Multi-focal Composite Lens Formed from a Semi-finished Polycartsonate Lens Substrate and a Front Semi-Solid Superstrate Layer The disc-shaped preform from Example 12 was used as the superstrate. A semi-finished polycartxsnate lens with a base curve of 6.25 on the front surface was used as the substrate. The semi-finished polycart)onate lens was soaked in 5% KOH overnight in order to treat the anti-scratch coating on the sur’K:e to promote adhesion of the superstrate layer. A glass moki virith a base curve of 6.25 and a bi-focal add pocket was used as the mold for the front surface of the composite lens. In order to fadi'itate mold release, the glass mold was treated with Relisse 2520 (Nanofiim, Ltd., Valley View, Ohio), following the manufacturer's instructions. The prefomn was placed between the front lens mokJ and the polycarisonate semi-finished lens. The front lens mold/ preform/ polycarbonate lens sandwich was then placed in a Carver hydraulic press, fitted vinth temperature-controlled top anc botbm platens that were set to 210 °F. Slight positive pressure was applied (no greater than 1 pound force) while the preform softened due to the heat provided by the platens. Upon compression th’ semi-solid preform filled in the cavity between the mold surface and polycartwnate substrate including the bi-foca! pocket area, flowing radially outward from the center toward the edges. Nc defects were observed. The resulting semi-solid superstrate layer was about 1 mm thick in the i outside of the bifocal pocket. The substrate-superstrate-mold sandwich was then removed from the mold, placed on s hotplate set to approximately 90 "C, and cured with ultraviolet light projected through the lens mi The UV light source was a Blak-Ray Model B 100AP Longwave Ultraviolet Lamp, with flood bulb (from UVP, Upland, California). Curing proceeded for about 10 minutes, during which time the s The composite lens was edged with no signs of delamination between the two layers. Tl composite lens was also immersed altemately between a water bath at 95 °C for 5 minutes and water bath at about 0 °C for 5 minutes, all with no signs of delamination of the layers. Example 14. A Photochromic Composite Lens Formed from a Finished Polycarbonate Lens Substrate and a Front Semi-solid Superstrate Layer Photochromic dye (e.g., "Thunderstorm Purple" from James Robinson) was solvated at wt% concentration in the reactive plasticizer isobomyl methacrylate ("IBMA" - SR 423A. Sartom The resulting dye solution was then filtered to remove any macro-particles. About 0.1g of the dye solution was added to a scintillation vial already containing 0.1g IE and 0.2 g ethoxylated Bisphenol A Dimethacrylate (BisADMA - SR348, Sartomer) as additional reactive plasticizers, and was stirred to disperse the dye throughout the mixture. 1.6 Grams of K Resin KR03-NW were added to the vial, and the mixture was stirred such that all the polymer particles were covered with the reactive plasticizers. The final composition in the vial was: 80 vi/t polymer, 20 wt% reactive plasticizer, with the dye present at 0.05 wt% of the total weight Approximately 8 grams of the material was then processed according to the procedure of Exami 12 to form a semi-solid preform containing a photochromic dye and measuring about 70 mm in diameter and 2 mm thick. The preform was then processed as described in Example 13, except that a piano, finisi polycart>onate single vision lens was used as the back substrate. The polycarbonate substrate v approximately 1 mm thick, had a base curve of 6.00, and had not been treated with an anti-sera coating on either surface, and therefore, no KOH treatment was used. Also, a spherical front ler mold having a base curve of approximate 6.25 was used to shape the outer surface of the semi' prefomi during molding. The result was a composite lens consisting of a previously semi-solid, photochromic dye-containing superstrate (approximately 1 mm thick) adhered to a finished polycarbonate lens substrate, said composite lens being about 2 mm in thickness. The sample could be moved between hot and cold water baths and could be edged witi signs of delamination between the superstrate and substrate layers. Exposure to sunlight effect* photochromic response that darkened the lens, and the photochromic response reversed upon removal from direct sunlight Example 15. A Photochromic Composite Lens Fonned from a Semi-finished Polycarbonate Lens Substrate and a Front Semi-solid Superstrata Layer The procedure of Example 14 was followed except that an anti-scratch coated polycarbonate semi-finished lens was used as the substrate. The substrate was treated with KOH as in Example 13 The resultant composite lens comprised a photochromic superstrate layer approximately 1 mm thicl Example 16. A Photochromic Composite Lens Fonned from a Semi-finished CR-39 Lens Substrate and a Front Semi-solid Superstrate Layer The procedure of Example 14 was followed except that an uncoated CR-39 semi-finished lens was used as the substrate. The substrate was not treated with KOH. The resultant composite lens comprised a photochromic superstrate layer approximately 1 mm thick bonded to the CR-39 semi-finished lens. The composite again showed good adhesion properties, as well as a reversible photochromk: response in sunlight Example 17. A Composite Lens fonned fi-om Two Polycarbonate Substrates and a Center Semi-Solid Layer A semi-solid composition is formed by mixing Kraton D4240P and tetrahydrofurfural acrylate in a ratk) of 4:1. A UV initiator, irgacure 184, is added at 2 wt%. A first or fi-ont polycarbonate substrate is obtained which has a piano, base 4.5 curve on the front and back surfaces, and a -t-Z bifocai pocket molded into the front surface. A second or back polycarbonate substrate is also obtained having a base curve of 6.5 on the front and back surfaces (for -2 diopter correction relative to the surface of Oie lens mold) and an imposed 1/2 diopter cylinder to give a toroidal back surtece. The polycartjonate substrates are rotated so as to align the toroidal t>ack surface with the bifocal pocket to give a cylinder angle of zero degrees. The semi-solid composition is placed near the center of the front polycarbonate substrate on its concave side, and the two substrates are then compressed together so that the semi-solid fills in the cavity between them by flowing from the center outward towards the edges of the substrates. Ultraviolet light is then projected through the foot and back substrates to cure the semi-solid material. The resulting composite lens consists of front and back B substrates, with the cured resin in between them bonding the two substrates together. The lens has a bifocal pocket built into the front surface and an aligned toroidal back surface for stigmata: correction. Note: the cylinder alignment can be easily adjusted to forint a lens with other desired degrees of rotation by simply rotating the back substrate relative to the front substrate prior to compress ton of the semi-solid material. The resulting lens is also extremely impact resistant WE CLAIM: 1. A composite lens comprising a substrate and a discrete layer of resin polymerized in place over said substrate and bonded thereto, said discrete layer comprising a crosslinked polymer network of 1% to 50% by weight of a reactive plasticizer within a fully polymerized and non reactive dead polymer. 2. The composite lens as claimed in claim 1, wherein the reactive plasticizer constitutes 15% to 40% by weight of said crosslinked polymer network. 3. The composite lens as claimed in claim 1, wherein the dead polymer is selected from the group consisting of thermoplastics, thermosets, thermoplastic elastomers. 4. The composite lens as claimed in claim 1, wherein the resin is a semi-solid prior to cure. 5. The composite lens as claimed in claim 1, wherein the resin is one that exhibits less than 8% shrinkage upon cure. 6. The composite lens as claimed in claim 1, wherein the resin is one that exhibits a refractive index within 0.05 units of the reactive index of the substrate. 7. The composite lens as claimed in any of claims 1 to 6, which is an optical lens. 8. The composite lens as claimed in any of claims 1 to 6, which is an ophthalmic lens. 9. The composite lens as claimed in claims 7 or 8, wherein the substrate is selected from the group consisting of optical quality glasses, photo chromic glasses. bisallyl carbonates, halogenated aromatic polycarbonates, non-halogenated aromatic polycarbonates, polyethylene terephthalates, polybutylene terephthalates, polystyrenes, polymethyl methacrylates, acrylonitrile-butadiene-styrene copolymers, polystyrene-co-butadiene copolymers, polystyrene-co-isoprene copolymers, polycyclohexylethylene, polycyclohexylethylene-co-butadiene copolymers, amorphous polyolefins, polyolefin copolymers, and polyurethanes. 10. The composite lens as claimed in claims 7 or ,8 wherein the substrate is a polycarbonate of bisphenol A. 11. The composite lens as claimed in claims 7 or 8, wherein the substrate has a toroidal back surface and the layer of resin has a multi-focal front surface. 12. The composite lens as claimed in claims 7 or 8, wherein the substrate has a multi-focal front surface and the layer of resin has a toroidal back surface. 13. The composite lens as claimed in claims 7 or 8, wherein the substrate has a toroidal back surface and the layer of resin has a multi-focal front surface. 14. The composite lens as claimed in claims 7 or 8, which comprises a layer of said resin on each of opposite sides of said substrate. 15. The composite lens as claimed in claim 14, wherein the substrate is a polarizing film. 16. The composite lens as claimed in claim 14, wherein one of said layers of resin has a multi-focal front surface and the other of said layers of resin has a toroidal-shaped back surface. 17. The composite lens as claimed in claim 14, wherein at least one of said layers of resin has a scratch-resistant surface. 18. The composite lens as claimed in claims 7 or 8, wherein said lens is a multimodal lens incorporating astigmatic corrections. 19. The composite lens as claimed in claims 7 or 8, wherein said layer of resin further contains a photo chromic dye or pigment. 20. The composite lens as claimed in claim 1, wherein said lens is a polychromic lens. 21. The composite lens as claimed in claims 7 or 8, comprising a surface-modifying material on a surface of said layer of resin. 22. The composite lens as claimed in claim 21, wherein the surface-modifying material is selected from the group consisting of a material that imparts scratch resistance, a dye, a pigment, a material having a low-refit-active-index relative to said layer of resin, an anti-static material, and heterofunctional additives. 23. The composite lens as claimed in claim 1, wherein said discrete layer of resin is bonded to said substrate through a semi conducting material. 24. The composite lens as claimed in claim 1, wherein said layer of resin further comprises liquid crystalline polymers. 25. The composite lens as claimed in claim 1, which is an electronic display device wherein the layer of resin covers an active surface of the device and the surface of the layer of resin is molded into a geometry that controls the reception or emission of light to or from the device. 26. A method for the manufacture of a composite lens, said method comprising: forming a layer of semi-solid polymerizable material on the surface of a substrate, said semi-solid polymerizable material comprising a reactive plasticizer, an initiator, and a dead polymer, and placing said semi-solid polymerizable material and substrate in a mold cavity and compressing said semi-solid polymerizable material and substrate in said mold cavity while exposing the semi-solid polymerizable material to a source of polymerizing energy to polymerize and harden the semi-solid polymerizable material and to bond the semi-solid polymerizable material to the substrate. 27. The method as claimed in claim 26, wherein said semi-solid polymerizable material is a preform. 28. The method according as claimed in claim 27, wherein said preform and said mold cavity both have convex surfaces, concave surfaces, or both convex and concave surfaces, and any convex surface of said preform has a smaller radius of curvature than the corresponding convex surface of said mold cavity, and any concave surface of said preform has a larger radius of curvature than the corresponding concave surface of said mold cavity, such that compression of said preform causes said preform to flow radially outward. 29. The method as claimed in claim 27, wherein said mold cavity has a surface with an approximately infinite radius of curvature along at least one axis, whereby compression of said preform causes said semi-solid polymerizable material to fill said mold cavity without the entrainment of air bubbles or voids. 30. The method as claimed in claim 26, comprising treating said semi-solid polymerizable material with a surface-modifying composition before exposure to polymerizing energy. 31. The method as claimed in claim 30, wherein said surface-modifying composition is a scratch-resistant precursor formulation. 32. The method as claimed in claim 26, comprising holding said semi-solid polymerizable material and substrate at an elevated temperature for a sufficient period of tile to reduce stresses resulting from said compression, before exposing said semi-solid polymerizable material to said polymerizing energy. 33. The method as claimed in claim 26, comprising placing a semi-conducting material within or between said semi-solid polymerizable material and said substrate prior to compressing said semi-solid polymerizable material and substrate in said mold cavity. 34. The method as claimed in claim 26, wherein said semi-solid polymerizable material further comprises liquid crystalline polymers. 35. The method as claimed in claim 26, comprising placing said semi-solid polymerizable material between two substrates and compressing said semi-solid polymerizable material between said substrates in said mold cavity while exposing said semi-solid polymerizable material to said source of polymerizing energy. 36. The method as claimed in claim 35, wherein said semi-solid polymerizable material is a preform. 37. The method as claimed in claim 26, wherein said substrate is an electronic

Documents:

in-pct-2002-1286-che abstract.pdf

in-pct-2002-1286-che assignment.pdf

in-pct-2002-1286-che claims-duplicate.pdf

in-pct-2002-1286-che claims.pdf

in-pct-2002-1286-che correspondence-others.pdf

in-pct-2002-1286-che correspondence-po.pdf

in-pct-2002-1286-che description (complete)-duplicate.pdf

in-pct-2002-1286-che description (complete).pdf

in-pct-2002-1286-che form-1.pdf

in-pct-2002-1286-che form-18.pdf

in-pct-2002-1286-che form-26.pdf

in-pct-2002-1286-che form-3.pdf

in-pct-2002-1286-che form-5.pdf

in-pct-2002-1286-che others.pdf

in-pct-2002-1286-che pct.pdf

in-pct-2002-1286-che petition.pdf