Patent ID: 8969219
Filing Date: 2015-03-03
Classification: C08G,G02B,G03F,H01L

Abstract:
1. A method for preparation of a UV-curable resin product or solution thereof, said method comprising the steps: (i) providing (a) a first monomer or first mixture of monomers each independently being a metal alkoxide; (b) a second monomer or second mixture of monomers each independently being a metal alkoxide in which at least one but not all the alkoxyl groups is substituted by a non-polymerizable group; and (c) a third monomer or third mixture of monomers each independently being a metal alkoxide in which at least one but not all the alkoxyl groups is substituted by a non-hydrolyzable polymerizable group; (ii) performing hydrolysis and poly-condensation of said monomers or mixtures of monomers of (a), (b) and (c) in the presence of water and an hydrolysis catalyst, in a closed system, at an elevated temperature and pressure, to thereby release an alcohol that serves as a common solvent, while said temperature is kept above the boiling point of said alcohol and below the boiling point of said monomers, and vapors of said solvent and the water are removed, thus keeping a constant pressure; and (iii) reducing the pressure in said system below atmospheric pressure, thus evacuating remaining vapors of said solvent and the water to thereby obtain a resin product, wherein either: a photo-initiator is added to one of the monomers or mixtures of monomers in step (i) or to the water in step (ii) to thereby obtain, following step (iii), the UV-curable resin product; or the resin product obtained in step (iii) is dissolved in a solution comprising a solvent capable of preventing or delaying polymerization and a photo-initiator, and optionally subsequently filtered, to thereby obtain a solution of the UV-curable resin product capable of long-term storage without polymerizing.