Patent ID: 6933325
Filing Date: 2005-08-23
Classification: C08F,G02B

Abstract:
1. A high refractive index core resin composition comprising (i) 2 to 70 parts by weight of at least one first compound corresponding to formula (I):  wherein n and n′ independently are 3-5, R X is O, S, SO y (ii) 2 to 80 parts by weight of at least one second compound corresponding to formula (II):  wherein m is at least 1, and R (iii) 2 to 60 parts by weight of a reactive diluent selected from the group consisting of 1,6-hexanediol di(meth)acrylate, trimethylolpropane tri(meth)acrylate, isobornyl (meth)acrylate, 2-hydroxyethyl (meth)acrylate, 2-phenoxyethyl (meth)acrylate, vinyl benzoate, vinyl 4-t-butyl benzoate, styrene, divinyl benzene, and mixtures thereof; and (iv) 2 to 60 parts by weight of a multi-functional (meth)acrylate or (meth)acrylate derivative with three or more acrylate functional groups selected from the group consisting of trimethylolpropane tri(meth)acrylate, pentaerythritol tri(meth)acrylate, glyceryl tri(meth)acrylate pentaerythritol tetra(meth)acrylate, di-trimethylolpropane tetra(meth)acrylate, dipentaerythritol penta(meth)acrylate, penta(meth)acrylate ester and mixtures thereof; per 100 total parts by weight of components (i), (ii), (iii) and (iv), the composition further comprising (v) 0.0001 to 1.0 part by weight of at least one photochromic dye; (vi) 0.01 to 3 part by weight of a photo initiator; (vii) 0.01 to 3 part by weight of a thermal initiator; and (viii) up to 5 total parts by weight of other additives selected from the group consisting of light stabilizers, mold release agents and processing agents.