Title of Invention	A PROCESS FOR THE PREPARATION OF A SURFACE NANO-STRUCTURED AND / OR NANO-POROUS COATING
Abstract	A process for the preparation of a surface nano-structured and / or nano-porous coating comprising the steps of a. applying a mixture to a substrate which mixture comprises. i. reactive nano-particles, having reactive organic groups on their surface, whterein the reactive nano-particles are elongated. ii. at least one solvent; b. polymerizing the mixture on the substrate.

Full Text

The invention relates to a new process for the preparation of nano-structured and/or nano-porous surfaces, coatings having a nano-structured and/or nano-porous surface and articles comprising said coatings. The invention also relates to the use of coatings according to the invention, in particular as anti-reflective coatings. The process for the preparation of the surface nano-structured and/or nano-porous coatings is a process comprising the steps of a) applying a mixture to a substrate which mixture comprises j) reactive nano-particles ii) at least one solvent iii) optionally a compound having at least one polymerisable group, in an amount that results in an increase in the transmission of at least 0.5%, for at least part of the electromagnetic spectrum between 400 and 800 nm, after the mixture has been applied and cured on a transparent substrate, in comparison with the same substrate without a coating b) inducing crosslinking and/or polymerisation in the mixture applied to the substrate. ABSTRACT The invention relates to a new process for the preparation of nano-structured and/or nano-porous surfaces, coatings having a nano-structured and/or nano-porous surface and articles comprising said coatings. The invention also relates to the use of coatings according to the invention, in particular as anti-reflective coatings. The process for the preparation of the surface nano-structured and/or nano-porous coatings is a process comprising the steps of a) applying a mixture to a substrate which mixture comprises j) reactive nano-particles ii) at least one solvent iii) optionally a compound having at least one polymerisable group, in an amount that results in an increase in the transmission of at least 0.5%, for at least part of the electromagnetic spectrum between 400 and 800 nm, after the mixture has been applied and cured on a transparent substrate, in comparison with the same substrate without a coating b) inducing crosslinking and/or polymerisation in the mixture applied to the substrate. CLAIMS 1. A process for the preparation of a surface nano-structured and/or nano-porous coating or film comprising the steps of a) applying a mixture to a substrate which mixture comprises i) reactive nano-particles, having reactive organic groups on their surface, ii) at least one solvent iii) optionally a compound having at least one polymerisable group in an amount small enough to allow the formation of a nano- structures and/of nano-porous surface after polymerisation of the mixture b) polymerising the mixture on the substrate. 2) Process according to claim 1, wherein a mixture is used comprising a compound having at least one polymerisable group, in an amount that results in an increase in the transmission of at least 0.5%, for at least one wave length in the spectrum between 400 and 800 nm, after the mixture has been applied as a coating, in a thickness between 100 and 200nm, at one side of a transparent substrate, in comparison with the same substrate without a coating 3) A process according to claim 1 or 2, wherein the reactive nano-particles are oxide particles. 4) A process according to any one of claims 1-3 wherein the particles are silicon oxide or zirconium oxide particles. 5) A process according to any one of claims 1-4, wherein the reactive nano-particles are elongated. 6) A process according to any one of claim 5, wherein the reactive nano-particles have an aspect ratio greater than 5. 7) A process according to any one of claims 1-6, wherein the reactive nano-particles have a length of less than 350 nm. 8) A process according to any one of claims 1-7, wherein the compound having at least one polymerisable group is an acrylate. 9) A mixture according to any one of claims 1-8, wherein the compound having at least one polymerisable group has two or more polymerisable groups. 10) A process according to any one of claims 1-9, wherein the poymerisation is achieved by applying UV-radiation. 11) A mixture as defined in any one of claims 1 -10. 12) A coating having a nano-structured and/or nano-porous surface obtainable by the process according to any one of claims 1 to 10. 13) A coating according to claim 12 containing an amount of reactive nano-particles between 70-100 wt%, relative to the weight of the coating. 14) A coating according to claim 12 or 13, having a thickness of between 50-200 nm. 15) A coating according to any one of claims 12-14, which coating increases the transmission by at least 0.5% for at least part of the electromagnetic spectrum between 400 and 800 nm if the coating is present on a transparent substrate in comparison with the same substrate without a coating. 16) A coating according to claim 15, which coating increases the transmission by at least 1 %, preferably by at least 2 %. 17) A coating according to any one of claims 12-16, showing a static water contact angle of less than 60°, more preferably, less than 40° 18) A coating according to any one of claims 12-16, showing a static water contact angle of more than 90°, more preferably, more than 120°. 19) A coating according to claim 18, showing a contact angle of of more than 90°, more preferably, more than 120° and most preferably, more than 140°. 20) A coating prepared from a mixture comprising reactive nano-particles, a solvent and a compound having at least one polymerizable group, wherein the volume fraction of the compound having at least one polymerizable group is less than 1 - the random close packing volume fraction of the reactive nano-particles. 21) Use of a coating according to any one of claims 12-20 as an antireflective coating. 22) Use of a coating obtainable by the process according to any one of claims 1-10 as a membrane. 23) Use of the coating according to any one of claims 12-20 in a process of reverse sorption of at least one non-cross-linkable species. 24) An article comprising a coating obtainable by the process according to any one of claims 1-10. 25) An article according to claim 24, which article is a display . 26) An article according to claim 25, which article is an organic light emitting diode (OLED) display. 27) An article according to claim 24, which article is a polarizer for a liquid crystal display (LCD). 28) An article according to claim 24, which article is a polyethyleneterphtalate (PET) film or cellulosetriacetate (TAC) film. 29) A display comprising the article according to claim 28.

Documents:

3073-CHENP-2005 ABSTRACT.pdf

3073-CHENP-2005 CLAIMS GRANTED.pdf

3073-CHENP-2005 CORRESPONDENCE OTHERS.pdf

3073-CHENP-2005 CORRESPONDENCE PO.pdf

3073-CHENP-2005 FORM 18.pdf

3073-CHENP-2005 FORM 3.pdf

3073-CHENP-2005 PCT.pdf

3073-CHENP-2005 PETITIONS.pdf

3073-CHENP-2005 POWER OF ATTORNEY.pdf

3073-chenp-2005-abstract.pdf

3073-chenp-2005-claims.pdf

3073-chenp-2005-correspondnece-others.pdf

3073-chenp-2005-description(complete).pdf

3073-chenp-2005-form 1.pdf

3073-chenp-2005-form 18.pdf

3073-chenp-2005-form 26.pdf

3073-chenp-2005-form 3.pdf

3073-chenp-2005-form 5.pdf

3073-chenp-2005-pct.pdf

3073-chenp-2005.tif