Patent ID: 6740721
Filing Date: 2004-05-25
Classification: C08F,G02B

Abstract:
A plastic lens composition comprising a component (&agr;) shown below as an essential component, wherein a cured material, obtained by curing said composition, has a refractive index of 1.58 or more at 25Â° C. and a specific gravity of 1.40 or less at 23Â° C.:Component (&agr;): a compound having at least one group represented by the following formula (1) as a terminal group and a group represented by the following formula (2) as a repeating unit: wherein each R1 independently represents an allyl group or a methallyl group and each A1 independently represents an organic residue derived from a dicarboxylic acid or a carboxylic anhydride; wherein each A2 independently represents an organic residue derived from a dicarboxylic acid or a carboxylic anhydride and each X is independently an organic residue and the X's represent one or more organic residues containing, as an essential component, an organic residue derived from a bromine-containing compound having two or more hydroxyl groups, provided that, by the ester bonding, X can have a branched structure having a group of formula (1) as a terminal group and a group of formula (2) as a repeating unit.