Patent ID: 7968204

Claim:
An optical article comprising a transparent substrate, and a high refractive and abrasion-resistant layer coated onto at least one surface of said substrate, wherein said layer results from reacting and curing a mixture containing the following compounds: a first organo-silane compound chosen from thiocarbamate-silane compounds containing at least one terminal alkoxysilane group, or hydrolysates thereof, said thiocarbamate-silane compound resulting from the reaction of a polythiol comprising at least two —SH thiol substituent, with an isocyanato-silane compound represented by the general formula: (R 1 ) 3 Si—R 2 —N═C═O wherein R 1 represents a group selected from linear or branched (C 1 -C 6 ) alkoxy, and R 2 represents a group selected from linear or branched (C 1 -C 6 ) alkylene, linear or branched (C 1 -C 6 ) alkenylene, arylene, and (C 5 -C 12 )cycloakylene, each of these groups being optionally substituted by one to six groups selected from halogen, alkoxy, carboxy, alkylcarbonyl, alkoxycarbonyl, and perfluoroalkyl, wherein the polythiol is selected from the group consisting of 4-mercaptomethyl-3,6-dithia-1,8-octanedithiol, trimethylolpropane tris(3-mercapto propionate), pentaerythritol tetrakis(3 mercaptoacetate), trimethylolpropane tris(3-mercaptoacetate), 4-t-butyl-1,2 benzenedithiol, bis-(2-mercaptoethyl)sulfide, 4,4′-thiodibenzenethiol, benzenedithiol, glycol dimercaptoacetate, glycol dimercaptopropionate ethylenebis(3 mercaptopropionate), polyethylene glycol dimercaptoacetates, polyethylene glycol di(3 mercaptopropionates), pentaerythritol tetrakis(3-mercapto-propionate), tris-(3-mercaptopropyl)isocyanurate, 1,2,3-trimercaptopropane, 2,2-bis(mercaptomethyl)-1,3-propanedithiol, dipentaerythrithiol, 1,2,4-trimercaptomethyl benzene, 2,5-dimercaptomethyl-1,4-dithiane, bisphenofluorene bis(ethoxy-3-mercaptoproprionate), 4,8-bis(mercaptomethyl)-3,6,9 trithia-1,11-undecanedithiol, 2-mercaptomethyl-2-methyl-1,3-propanedithiol, 1,8-dimercapto-3,6-dioxaoctane, thioglycerol bismercapto-acetate, and mixtures thereof, an inorganic oxide selected from the group consisting of iron, titanium, cerium, zirconium, antimony, zinc, tin oxides, silica, and composite oxides thereof, a curing catalyst for said organo-silane, and a solvent for said organo-silane.