Title of Invention

"OPTICAL DATA CARRIER CONTAINING A PHTHALOCYANINE COLOURING AGENT AS A LIGHT ABSORBING COMPOUND IN THE INFORMATION LAYER"

Abstract

Optical data medium containing a substrate which is optionally already coated with one or more reflective layers and on the surface of which an information layer which can be recorded on using light, optionally one or more reflective layers and optionally a protective layer or a further substrate or a covering layer have been applied, which data medium can be recorded on and read using blue light, the information layer containing a light-absorbing compound and optionally a binder, characterized in that at least one phthalocyanine dye is used as the light-absorbing compound.

Full Text

Optical data medium containing, in the information layer, a phthalocyanine dye as a light-absorbing compound Prior art The invention relates to a singly recordable optical data medium which contains, m the information layer, at least one phthalocyanine dye as a light-absorbing compound, and a process for its production. The singly recordable optical data media using special light-absorbing substances or mixtures thereof are suitable in particular for use m the case of high-density recordable optical data media which operate with blue laser diodes, in particular GaN or SHG laser diodes (360 - 460 nm) and/or for use in the case of DVD-R or CD-R discs which operate with red (635 - 660 nm) or infrared (780 - 830 nm) laser diodes, and the application of the abovementioned dyes to a polymer substrate, in particular polycarbonate, by spin-coatmg, vapour deposition or sputtering. The singly recordable compact disc (CD-R, 780 nm) has recently been experiencing enormous growth in quantity and is a technically established system. Recently, the next generation of optical data stores - the DVD - was launched on the market. By using shorter-wave laser radiation (635 to 660 nm) and a higher numerical aperture NA, the storage density can be increased. In this case, the singly recordable format is the DVD-R Optical data storage formats which use blue laser diodes (based on GaN, JP-A-08 191 171 or Second Harmonic Generation SHG JP-A-09 050 629) (360 nm to 460 nm) having a high laser power are now being developed. Recordable optical data stores are therefore also used m this generation The recordable storage density depends on the focusing of the laser spot m the information plane The spot size is scaled with the laser wavelength  /NA NA is the numerical aperture of the lens used. In order to obtain as high a storage density as possible, the use of as short a wavelength X as possible is desirable. At present, 390 nm are possible on the basis of semiconductor laser diodes The patent literature describes recordable optical data stores which are based on dyes and are just as suitable for CD-R and DVD-R systems (JP-A 11 043 481 and JP-A 10 181 206). Here, for high reflectivity and a high modulation amplitude of the readout signal, and for sufficient sensitivity during recording, use is made of the fact that the IR wavelength 780 nm of the CD-R lies at the foot of the long-wave flank of the absorption peak of the dye, and the red wavelength 635 nm or 650 nm of the DVD-R lies at the foot of the short-wave flank of the absorption peak of the dye (cf. EP-A 519 395 and WO-A 00/09522). This concept is extended in JP-A 02 557 335, JP-A 10 058 828, JP-A 06 336 086, JP-A 02 865 955, WO-A 09 917 284 and US-A 5 266 699 to include the region of 450 nm operating wavelength on the short-wave flank and the red and IR region on the long-wave flank of the absorption peak. In addition to the abovementioned optical properties, the recordable information layer comprising light-absorbing organic substances must have a morphology which is as amorphous as possible, in order to minimize the noise signal during recording and read-out. For this purpose, it is particularly preferred if, during application of the substances by spin-coating from a solution, by sputtering or by vapour deposition and/or sublimation, crystallization of the light-absorbing substances is prevented during the subsequent overcoating with metallic or dielectric layers m vacuo. The amorphous layer of light-absorbing substances should preferably have a high heat distortion resistance, since otherwise further layers of organic or inorganic material which are applied by sputtering or vapour deposition to the light-absorbing information layer will form ill-defined interfaces through diffusion and thus adversely affect the reflectivity. In addition, hght-absofbing substances having too low a heat distortion resistance at the interface with a polymeric substrate can diffuse into the latter and once again adversely affect the reflectivity If a light-absorbing substance has too high a vapour pressure, said substance can sublime during the abovementioned sputtering or vapour deposition of further layers in a high vacuum and hence reduce the desired layer thickness. This in turn leads to an adverse effect on the reflectivity It is accordingly an object of the invention to provide suitable compounds which meet the high requirements (such as light stability, advantageous signal/noise ratio, damage-free application to the substrate material, etc.) for use in the information layer in a singly recordable optical data medium, in particular for high-density recordable optical data storage formats in a laser wavelength range of from 360 to 460 nm. Surprisingly, it was found that light-absorbing compounds from the group consisting of the phthalocyanines can fulfil the abovementioned requirement profile particularly well. Phthalocyanines have an intense absorption m the wavelength range of 360 -460 nm important for the laser, l e. the B or Soret band. The present invention therefore relates to an optical data medium, containing a preferably transparent substrate which is optionally already coated with one or more reflective layers and on the surface of which an information layer which can be recorded on using light, optionally one or more reflective layers and optionally a protective layer or a further substrate or a covering layer have been applied, which can be recorded on and read using blue light, preferably laser light, particularly preferably light at 360 - 460 nm, in particular 380 - 420 nm, very particularly preferably at 390-410 nm, the information layer containing a light-absorbing compound and optionally a binder, characterized in that at least one phthalocyanme is used as the light-absorbing compound. In a preferred embodiment, the phthalocyanme used is a compound of the formula (I) (Formula Removed) m which Pc represents a phthalocyanme, M represents two independent H atoms, represent a divalent metal atom or represents a trivalent axially monosubstituted metal atom of the formula (la) (Formula Removed) or represents a tetravalent axially disubstituted metal atom of the formula (lb) (Formula Removed) or represents a trivalent axially monosubstituted and axially monocoordinated metal atom of the formula (Ic) (Formula Removed) where, in the case of a charged hgand X2 or X1, the charge being compensated by an opposite ion, for example an anion An0 or cation Kat , the radicals R to R corresponding to substituents of the phthalocyanine ring, in which X1 and X2, independently of one another, represent halogen such as F, CI, Br, I, hydroxyl, oxygen, cyano, thiocyanato, cyanato, alkenyl, alkmyl, arylthio, dialkylamino, alkyl, alkoxy, acyloxy, alkylthio, aryl, aryloxy, -O-SO2R8, -0-PR10Rn, -0-P(0)R12R13, -0-SiR14R15R16, NH2, alkylammo and the radical of a heterocyclic amine, R3, R4, R5 and R6, independently of one another, represent halogen such as F, CI, Br, I, cyano, nitro, alkyl, aryl, alkylammo, dialkylamino, alkoxy, alkylthio, aryloxy, arylthio, SO3H, SOzNR1R2, CO2R9, CONR1R2, NH-COR7 or a radical of the formula -(B)m-D, in which B denotes a bridge member from the group consisting of a direct bond, CH2, CO, CH(alkyl), C(alkyl)2, NH, S, O or -CH=CH-, (B)m denoting a chemically reasonable sequence of bridge members B where m is from 1 to 10, preferably mis 1, 2, 3 or 4, (Formula Removed) D represents the monovalent radical of a redox system of the formula or or represents a metallocenyl radical or metallocenylcarbonyl radical, titamum, manganese, iron, ruthenium or osmium being suitable as the metal centre, Z1 and Z2, independently of one another, represent NR'R", OR" or SR", Y1 represents NR', 0 or S, Y2 represents NR', n represents 1 to 10 and R' and R", independently of one another, represent hydrogen, alkyl, cycloalkyl, aryl or hetaryl, or form a direct bond or bridge'to one of the C atoms of the (Formula Removed) w, x, y and z, independently of one another, represent 0 to 4 and w+x+y+z R and R , independently of one another, represent hydrogen, alkyl, hydroxyalkyl or aryl, or R and R , together with the N atom to which they are bonded, form a heterocyclic 5-, 6- or 7-membered ring, optionally with participation of further hetero atoms, in particular from the group consisting of O, N and S, NR R representing m particular pyrrohdmo, piperidmo or morpholino, R7 to R16, independently of one another, represent alkyl, aryl, hetaryl or hydrogen, in particular represent alkyl, aryl or hetaryl, An" represents an anion, in particular represents hahde, C1- to C20-alkylCOO" , formate, oxalate, lactate, glycolate, citrate, CH3OSO3", NH2S03", CH3SO3", lA SO42" or 1/3 P043". Where M represents a radical of the formula (Ic), in particular with Co(III) as the metal atom, preferred heterocyclic amine hgands or substituents in the meaning of X1 and X2 are morpholme, pipendme, piperazme, pyridine, 2,2-bipyridme, 4,4-bipyndine, pyridazme, pynmidme, pyrazine, imidazole, benzimidazole, isoxazole, benzisoxazole, oxazole, benzoxazole, thiazole, benzothiazole, qumoline, pyrrole, indole and 3,3-dimethyhndole, each of which is coordinated with or substituted by the metal atom at the nitrogen atom. The alkyl, alkoxy, aryl and heterocyclic radicals can optionally carry further radicals, such as alkyl, halogen, hydroxyl, hydroxyalkyl, amino, alkylamino, dialkylammo, nitro, cyano, CO-NH2, alkoxy, alkoxycarbonyl, morpholmo, pipendino, pyrrolidmo, pyrrohdono, tnalkylsilyl, tnalkylsiloxy or phenyl. The alkyl and alkoxy radicals may be saturated, unsaturated, straight-cham or branched, the alkyl radical may be partly halogenated or perhalogenated and the alkyl and alkoxy radical may be ethoxylated, propoxylated or silylated. Neighbouring alkyl and/or alkoxy radicals on aryl or heterocyclic radicals may together form a three- or four-membered bridge. Preferred compounds of the formula (I) are those in which the following applies for the radical R1 to R16, R' and R" and for the hgands or substituents X1 and X2- substituents with the designation "alkyl" preferably denote C1-C16-alkyl, in particular C1-C6-alkyl, which are optionally substituted by halogen, such as chlorine, bromine or fluorine, hydroxyl, cyano and/or C1-C6-alkoxy; substituents with the designation "alkoxy" preferably denote C1-C16-alkoxy, in particular CrC6-alkoxy which are optionally substituted by halogen, such as chlorine, bromine or fluorine, hydroxyl, cyano and/or C1-C6-alkyl, substituents with the designation "cycloalkyl" preferably denote C4-C8-cycloalkyl, in particular C5- to C6-cycloalkyl, which are optionally substituted by halogen, such as chlorine, bromine or fluorine, hydroxyl, cyano and/or C1-C6-alkyl substituents with the designation "alkenyl" preferably denote C6-C8-alkenyl which are optionally substituted by halogen, such as chlonne, bromine or fluorine, hydroxyl, cyano and/or C1-C6-alkyl, alkenyl denoting m particular allyl, substituents with the meaning "hetaryl" preferably represent heterocyclic radicals having 5- to 7-membered rings which preferably contain hetero atoms from the group consisting of N, S and/or O and are optionally fused with aromatic rings or optionally carry further substituents, for example halogen, hydroxyl, cyano and/or alkyl, the following being particularly preferred: pyndyl, furyl, thienyl, oxazolyl, thiazolyl, imi-dazolyl, quinolyl, benzoxazolyl, benzothiazolyl and benzimidazolyl, the substituents with the designation "aryl" are preferably C6-C10-aryl, in particular phenyl or naphthyl, which are optionally substituted by halogen, such as F or CI, hydroxyl, C1-C6-alkyl, C1-C6-alkoxy, N02 and/or CN. R', R\ R3 and R°, independently of one another preferably represent chlorine, fluorine, bromine, iodine, cyano, methyl, ethyl, propyl, isopropyl, butyl, isobutyl, tert-butyl, pentyl, tert-amyl, hydroxyethyl, 3-dimethylaminopropyl, 3-diefhylaminopropyl, phenyl, p-tert-butylphenyl, p-methoxyphenyl, isopropylphenyl, trifluoromethylphenyl, naphthyl, methylammo, ethylammo, propylamino, isopropylamino, butylamino, isobutylammo, tert-butylammo, pentylammo, tert-amylamino, benzylamino, methylphenylhexylamino, hydroxyethylamino, aminopropylammo, ammoethylammo, 3-dimethylammo- propylamino, 3-diethylaminopropylammo, diethylaminoethylamino, dibutyl- ammopropylammo, morpholinopropylamino, piperidmopropylammo, pyrrolidinopropylamino, pyrrohdonopropylamino, 3-(methylhydroxyethyl- amino)propylamino, methoxyethylamino, ethoxyethylamino, methoxypropyl- amino, ethoxypropylammo, methoxyethoxypropylamino, 3-(2-ethyl- hexyloxy)propylammo, isopropyloxypropylamino, dimethylamino, diethyl- amino, diethanolamino, dipropylamino, diisopropylammo, dibutylamino, dnsobutylamino, di-tert-butylammo, dipentylammo, di-tert-amylammo, bis(2- ethylhexyl)amino, bis(aminopropyl)ammo, bis(aminoethyl)amino, bis(3- dimethylammopropyl)amino, bis(3-diefhylammopropyi)amino, bis(diethyl- aminoethyl)ammo, bis(dibutylaminopropyl)amino, di(morpholmo- propyl)ammo, di(pipendmopropyl)ammo, di(pyrrohdinopropyl)ammo, di-(pyrrolidonopropyl)amino, bis(3-(methyl-hydroxyethylamino)propyl)ammo, dimethoxyethylamino, diethoxyethylammo, dimethoxypropylamino, di-ethoxypropylamino, di(methoxyethoxyethyl)ammo, di(methoxyethoxy- propyl)ammo, bis(3-(2-ethylhexyloxy)propyl)ammo, di(isopropyloxy-isopropyl)amino, methoxy, ethoxy, propyloxy, isopropyloxy, butyloxy, isobutyloxy, tert-butyloxy, pentyloxy, tert-amyloxy, methoxyethoxy, ethoxyethoxy, methoxypropyloxy, ethoxypropyloxy, methoxyethoxypro-pyloxy, 3-(2-ethylhexyloxy)propyloxy, methylthio, ethylthio, propylthio, isopropylthio, butylthio, isobutylthio, tert-butylthio, pentylthio, tert-amylthio, phenyl, methoxyphenyl, tnfluoromethylphenyl, naphthyl, CO2R7, CONR1R2, NH-COR7, SO3H, SO2NR'R2 or preferably represent a radical of the formula (Formula Removed) in which (Formula Removed) where the asterisk (*) indicates the link with the 5-membered ring, M1 represents an Mn or Fe cation, w, x, y and z, independently of one another, represent 0 to 4 and w+x+y+z NR*R2 preferably represent amino, methylamvno, ethylamino, propylammo, isopropylammo, butylamino, isobutylammo, tert. butylamino, pentylamino, tert amylamino, benzylamino, methylphenylhexylamino, 2-ethyl-l-hexylamino, hydroxyethylamino, aminopropylammo, aminoethylammo, 3- dimethylaminopropylamino, 3-diethylaminopropylamino, mor- pholmopropylamino, pipendmopropylammo, pyrrohdmopropylamino, pyrrolidonopropylammo, 3-(methyl-hydroxyethylamino)propylammo, meth-oxyethylamino, ethoxyethylammo, methoxypropylammo, ethoxypropylamino, methoxyethoxypropylammo, 3-(2-ethylhexyloxy)propylammo, isopropyloxy-lsopropylammo, dimethylammo, diethylammo, dipropylammo, dnsopropyl-amino, dibutylamino, dnsobutylammo, di-tert-butylamino, dipentylammo, di-tert-amylamino, bis(2-ethylhexyl)ammo, dihydroxyethylamino, bis(ammo-propyl)amino, bis(ammoethyl)ammo, bis(3-dimethylaminopropyl)ammo, bis-(3-diethylaminopropyl)ammo, di(morpholmopropyl)ammo, di(pipendmopro-pyl)amino, di(pyrrolidmopropyl)ammo, di(pyrrolidonopropyl)ammo, bis(3-(methyl-hydroxyethylammo)propyl)amino, dimethoxyethylamino, diethoxy-ethylamino, dimethoxypropylamino, diethoxypropylammo, di(methoxy-ethoxypropyl)amino, bis(3-(2-ethylhexyIoxy)propyl)ammo, di(isopropyloxy-isopropyl)amino, anilmo, p-toluidino, p-tert-butylamlino, p-anisidmo, isopropylanilino or naphtylamino or NR!R2 preferably represent pyrrolidino, piperidino, piperazino or morpholmo, R7 to R16, independently of one another preferably represent hydrogen, methyl, ethyl, propyl, isopropyl, butyl, isobutyl, tert-butyl, pentyl, tert-amyl, phenyl, p-tert-butylphenyl, p-methoxyphenyl, isopropylphenyl, p-trifluoromethylphenyl, cyanophenyl, naphthyl, 4-pyridyl, 2-pyndyl, 2-qumolmyl, 2-pyrrolyl or 2-mdolyl, it being possible for the alkyl, alkoxy, aryl and heterocyclic radicals optionally to carry further radicals, such as alkyl, halogen, hydroxyl, hydroxyalkyl, amino, alkylammo, dialkylamino, nitro, cyano, CO-NH2, alkoxy, alkoxycarbonyl, morpholino, pipendmo, pyrrolidino, pyrrolidono, tnalkylsilyl, trialkylsilyloxy or phenyl, for the alkyl and/or alkoxy radicals to be saturated, unsaturated, straight-chain or branched, for the alkyl radicals to be partly halogenated or perhalogenated, for the alkyl and/or alkoxy radicals to be ethoxylated, propoxylated or silylated, and for neighbounng alkyl and/or alkoxy radicals on aryl or heterocyclic radicals together to form a three- or four-membered bridge. In the context of this application, redox systems are understood as meaning m particular the redox systems described in Angew Chem 1978, page 927, and in Topics of Current Chemistry, Vol 92, page 1 (1980). p-Phenylenediamines, phenothiazmes, dihydrophenazmes, bipyndinium salts (viologens) and quinodimethanes are preferred In a preferred embodiment, phthalocyanines of the formula (I), in which M represents two independent H atoms or represents a divalent metal atom Me from the group consisting of Cu, Ni, Zn, Pd, Pt, Fe, Mn, Mg, Co, Ru, Ti, Be, Ca, Ba, Cd, Hg, Pb and Sn or M represents a tnvalent axially monosubstituted metal atom of the formula (la), in which the metal Me is selected from the group consisting of Al, Ga, Ti, In, Fe and Mn, or M denotes a tetravalent axially disubstituted metal atom of the formula (lb), in which the metal Me is selected from the group consisting of Si, Ge, Sn, Zr, Cr, Ti, Co and V, are used X1 and X2 are particularly preferably halogen, m particular chlorine, aryloxy, in particular phenoxy, or alkoxy, in particular methoxy R -R represent m particular halogen, C1-C6-alkyl or C1-Cg-alkoxy. Phthalocyanmes of the formula I in which M represents a radical of the formula (la) or (lb) and w, x, y and z each represent 0, and X1 and/or X2 each denote halogen are very particularly preferred The phthalocyanmes used according to the invention can be prepared by known methods, for example: by synthesis of the nucleus from correspondingly substituted phthalodmitriles m the presence of the corresponding metals, metal halides or metal oxides, by chemical modification of a phthalocyanine, for example by sulphochlonnation or chlorination of phthalocyanines and further reactions, for example condensations or substitutions of the products resulting therefrom, the axial substituents X and X are usually prepared from the corresponding hahdes by exchange. The light-absorbing compound should preferably be thermally modifiable. Thermal modification is preferably effected at a temperature of The light-absorbing substances described guarantee a sufficiently high reflectivity of the optical data medium in the unrecorded state and sufficiently high absorption for the thermal degradation of the information layer during illumination at a point with focused blue light, in particular laser light, preferably having a light wavelength in the range from 360 to 460 nm The contrast between recorded and unrecorded parts on the data medium is realized through the change in reflectivity in terms of the amplitude as well as the phase of the incident light as a result of the changed optical properties of the information layer after the thermal degradation In other words, the optical data medium can preferably be recorded on and read using laser light having a wavelength of 360 - 460 nm. The coating with the phthalocyanmes is preferably effected by spm-coatmg, sputtering or vacuum vapour deposition. By vacuum vapour deposition or sputtering, it is possible to apply in particular the phthalocyanines which are insoluble in organic or aqueous media, preferably those of the formula (I) in which w, x, y and z each denote 0 and M represents (Formula Removed) i which Xi and X2 have the abovementioned meaning In particular, the phthalocyanines which are soluble in organic or aqueous media are suitable for application by spin-coating. The phthalocyanines can be mixed with one another or with other dyes having similar spectral properties. The information layer may contain additives, such as binders, wetting agents, stabilizers, diluents and sensitizers, and further components in addition to the phthalocyanines. The optical data store may carry further layers, such as metal layers, dielectric layers and protective layers, in addition to the information layer. Metal and dielectric layers serve, inter alia, for adjusting the reflectivity and the heat balance Metals may be gold, silver, aluminium, alloys, etc., depending on the laser wavelength. Dielectric layers are, for example, silica and silicon nitride. Protective layers are, for example, photocurable coats, adhesive layers and protective films. Alternatively, the structure of the optical data medium can: contam a preferably transparent substrate on the surface of which at least one information layer which can be recorded on using light, optionally a reflective layer and optionally an adhesive layer and a further preferably transparent substrate have been applied contain a preferably transparent substrate on the surface of which optionally a reflective layer, at least one information layer which can be recorded on using light, optionally an adhesive layer and a transparent covering layer have been applied The invention furthermore relates to optical data media according to the invention which can be recorded on using blue light, in particular laser light, particularly preferably laser light having a wavelength of 360 - 460 run. The following Examples illustrate the subject of the invention. Examples Example 1 (Formula Removed) The dye monochloro-aluminmm-phthalocyanme (AlClPc) was applied by vapour deposition in a high vacuum (pressure p = 2 • 10"5 mbar) from a resistively heated molybdenum boat at a rate of about 5 Als on a pregrooved polycarbonate substrate. The layer thickness was about 70 nm. The pregrooved polycarbonate substrate was produced as a disc by injection moulding. The diameter of the disc was 120 mm and its thickness 0.6 mm. The grooved structure applied in the injection moulding process had a track spacing of about 1 pan, and the groove depth and groove half-width were about 150 nm and about 260 nm, respectively. The disc with the dye layer as information earner was coated with 100 nm of Ag with vapour deposition. Thereafter, a UV-curable acrylic coat was applied by spm-coating and cured by means of a UV lamp Testing was carried out using a dynamic recording test setup which was mounted on an optical bench, consisting of a GaN diode laser ( = 405 nm), for producing linearly polarized laser light, a polarization-sensitive beam splitter, a /4 plate and a movably suspended collecting lens having a numerical aperture NA = 0 65 (actuator lens) The light reflected by the disc was coupled out of the beam path with the aid of the abovementioned polarization-sensitive beam splitter and focused by an astigmatic lens onto a four-quadrant detector. At a linear velocity V= 5.24 m/s and the write power Pw = 13 mW, a signal/noise ratio S/N = 25 dB was measured. The write power was applied here as a pulse sequence, the disc being irradiated alternately for 1µs with the abovementioned write power Pw and for 4 µs with the read power PT = 0 44 mW. The disc was irradiated with this pulse sequence until it had completed one revolution The marks thus produced were then read out with the read power PT - 0.44 mW and the abovementioned signal/noise ratio S/N was measured. Example 2 (Formula Removed) A 45 nm thick layer of the dye dichloro-silicon-phthalocyanine was applied by vapour deposition analogously to Example 1 to a disc having the same thickness and groove structure Using the same optical setup and the same recording strategy (write power Pw = 13 mW, read power PT = 0.44 mW), a signal/noise ratio S/N= 46 dB was measured at a linear velocity of V = 4.19 m/s. The phthalocyanmes of the following Examples were also used analogously to the procedure of Examples 1 and 2 and showed comparable properties. Example 3 (Formula Removed) In each case a 70 nm thick layer of the dye phenoxy-aluminium-phthalocyanme was applied by vapour deposition analogously to Example 1 to a disc having the same thickness and groove structure. Using the same optical setup and the same recording strategy (write power Pw = 13 mW, read power Pr = 0.44 mW) as in Example 1, a signal/noise ratio S/N- 22 dB was measured at a linear velocity of V- 5.24 m/s. Example 4 (Formula Removed) In each case a 70 nm thick layer of the dye diphenoxy-silicon-phthalocyanine was applied by vapour deposition analogously to Example 1 to a disc having the same thickness and groove structure. Using the same optical setup and the same recording strategy (write power Pw = 13 mW, read power Pr = 0 44 mW) as in Example 1, the signal/noise ratio S/N= 23 dB was measured at a linear velocity of V= 5.24 m/s. Example 5 (Formula Removed) WE CLAIM: 1. Optical data medium containing a substrate which is optionally already coated with one or more reflective layers and on the surface of which an information layer which can be recorded on using light, optionally one or more reflective layers and optionally a protective layer or a further substrate or a covering layer have been applied, which data medium can be recorded on and read using blue light, the information layer containing a light-absorbing compound and optionally a binder, characterized in that at least one phthalocyanine dye is used as the light-absorbing compound, wherein the phthalocyanine dye corresponds to the formula (I) (Formula Removed) in which Pc represents a phthalocyanine, M represents two independent H atoms, represents a divalent metal atom or represents a trivalent axially monosubstituted metal atom of the formula (la) (Formula Removed) or represents a tetravalent axially disubstituted metal atom of the formula (lb) (Formula Removed) or represents a trivalent axially monosubstituted and axially monocoordinated metal atom of the formula (Ic) (Formula Removed) where, in the case of a charged ligand or substituent X1 or X2, the charge being compensated by an opposite ion and the radicals R3 to R6 corresponding to substituents of the phthaloyanine, X1 and X2, independently of one another, represent halogen, hydroxyl, oxygen, cyano, thiocyanato, cyanato, alkenyi, alkinyl, arylthio, dialkylamino, alkyl, alkoxy, acyloxy, alkylthio, aryl, ary!oxy, -O-SO2R8, -O-PR10R11, -0-P(O)R12R13, -O-SiR14R15R16, NH2, alkylamino and the radical of a heterocylic amine, R3, R4, R5 and R6, independently of one another, represent halogen, cyano, nitro, C1-C16-alkyl which is unsubstituted or substituted by halogen, hydroxyl, cyano and/or C1-C6-alkoxy, aryl, alkylamino, dialkylamino, alkoxy, alkylthio, aryloxy, arylthio, SO3H, SO2NRIR2, CO2R9, CONR1R2, or NH-COR7 w, x, y, and z, independently of one another, represent an integer of 0 to 4 and w+x+y+z R1 and R2' independently of one another, represent alkyl, hydroxyalkyl or aryl or R1 and R2, together with the N atom to which they are bonded, form a heterocyclic 5-, 6- or 7-membered ring, optionally with participation of further hetero atoms, in particular from the group consisting of O, N and S, NR2R2 representing in particular pyrrolidino, piperidino or morpholino, R7 to R16, independently of one another, represent alkyl, aryl, hetaryl or hydrogen. 2. Optical data media as claimed in claim 1, wherein M represents two independent H atoms or represents a divalent metal atom from the group consisting of Cu, Ni, Zn, Pd, Pt, Fe, Mn, Mg, Co, Ru, Ti, Be, Ca, Ba, Cd, Hg, Pb and Sn or represents a trivalent axially monosubstituted metal atom of the formula (la) in which Me represents Al, Ga, Ti, In, Fe or Mn or represents a tetravalent metal atom of the formula (lb) in which Me represents Si, Ge, Sn, Zn, Cr, Ti, Co or V. 3. Optical data media as claimed in claim 1, wherein M represents a radical of the Formula (la) or (lb), in which Me represents Al or Si, Xi and X.2 represent halogen, aryloxy, or alkoxy and w, x, y and z each represent 0. 4. Optical date media as claimed in claim 1, wherein M represents a radical of the formula (la) or (lb) and w, x, y and z each represent O and X1 and/or X2 each denote halogen. 5. Optical data media as claimed in claim 4, wherein Xi and X2 represent chlorine, phenoxy or methoxy. 6. Optical data media as claimed in any of claim 1-5, wherein the substrate is transparent, and the blue light is laser light. 7. Process for the production of the optical data media as claimed in claim 1, wherein a substrate optionally already coated with a reflective layer is coated with the phthalocyanine dyes, optionally in combination with suitable binders and additives and optionally suitable solvents, and is optionally provided with a reflective layer, further intermediate layers and optionally a protective layer or a further substrate or a covering layer. 8. Process for the production of the optical data media as claimed in claim 7, wherein the coating with the phthalocyanine dyes is effected by means of spin-coating, sputtering or vapour deposition. 9. Optical data media having a recordable information layer, obtainable by recording on optical data media as claimed in claim 1 using blue light, having a wavelength of 360 - 460 nn. 10. Optical data media as claimed in claim 9, wherein the blue light is laser light having a wavelength of 360-460 nm.

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365-delnp-2003-abstract.pdf

365-delnp-2003-claims.pdf

365-delnp-2003-correspondence-others.pdf

365-delnp-2003-correspondence-po.pdf

365-delnp-2003-description (complete).pdf

365-delnp-2003-drawings.pdf

365-delnp-2003-form-1.pdf

365-delnp-2003-form-18.pdf

365-delnp-2003-form-2.pdf

365-delnp-2003-form-3.pdf

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