Patent ID: 7410691
Filing Date: 2008-08-12
Classification: C08J,C08K,C09D,C09J,G02B,Y10T

Abstract:
1. A photochromic article comprising: (a) an organic polymeric substrate chosen from thermoset substrates prepared from polymerizable compositions comprising allyl diglycol carbonate monomer(s), substrates prepared from thermoplastic polycarbonates, substrates prepared from polyurea urethanes and substrates prepared from compositions comprising the reaction product of polyfunctional isocyanate(s) and/or isothiocyanates with polythiols or polyepisulfide monomer(s), said substrate having a refractive index of from 1.48 to 1.74, (b) a photochromic organic polymeric coating appended to at least one surface of said polymeric substrate, said polymeric coating comprising a photochromic amount of at least one organic photochromic material selected from spirooxazines, benzopyrans, naphthopyrans, fulgides, metal dithizonates, diarylethenes and mixtures of such photochromic materials, said photochromic polymeric coating having a thickness of from 5 to 200 microns, and (c) a radiation-cured, acrylate-based film coherently appended to said photochromic polymeric coating, said acrylate-based film having a thickness of from 2 to 20 microns, wherein said acrylate-based film further comprises an adhesion enhancing amount of an organic adhesion promoter chosen from aminoorganosilanes, silane coupling agents, organic titanate coupling agents, organic zirconate coupling agents, and mixtures of said adhesion promoters; wherein the radiation-cured, acrylate-based film of (c) is harder than the photochromic organic polymeric coating of (b); and wherein the radiation-cured, acrylate-based film of (c) is resistant to removal by aqueous inorganic caustic.