Patent ID: 6852780
Filing Date: 2005-02-08
Classification: C08F,G02B

Abstract:
1. An optical material composition comprising: a polymerizable monomer material consisting of (a) 30 to 98 wt % of at least one dimethacrylate of formula (1) wherein R is a methyl group, Ph is a phenylene group, x and z are the same or different and each denotes an integer of 2 to 5 and y is 0;  and (b) 2 to 70 wt % of at least one monomer (M) having at least one vinyl group in one molecule thereof; wherein the at least one monomer (M) is not a di(meth)acrylate having the formula:  wherein R is a hydrogen atom or a methyl group, Ph is a phenylene group, x and z are the same or different and each denotes an integer of 1 to 5, and y is 0 or 1; and an additive consisting of 500 to 5000 ppm of a chlorinated benzotriazole UV absorber (A wherein a yellow value (b*) of said composition in the L*a*b* color specification system is not more than 1.0 when an optical path length is 2 mm.