Plastic lens composition, plastic lens, and process for producing the plastic lens

A plastic lens composition comprising a component (α) and a component (β) shown below, wherein a cured material, obtained by curing said composition, has a refractive index of 1.58 or more at 25° C. and a specific gravity of 1.40 or less at 23° C.:

• Component (α):
• 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, in an amount of 10 to 60% by mass based on whole curable components:
• 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;
• Component (β):
• at least one compound selected from the group consisting of compounds represented by the following formulae (3) and (4), in an amount of 10 to 90% by mass based on whole curable components:
• wherein R2 and R3 each independently represents an allyl group or a methallyl group;
• wherein R4 and R5 each independently represents an allyl group or a methallyl group.

A plastic lens composition comprising a component (α), a component (β) and a component (γ) shown below, wherein a cured material, obtained by curing said composition, has a refractive index of 1.58 or more at 25° C. and a specific gravity of 1.40 or less at 23° C.:

• Component (α):
• a compound having at least one group(9) represented by the following formula (1) as a terminal group and a group represented by the following formula (2) as a repeating unit, in an amount of 10 to 60% by mass based on whole curable components:
• 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;
• Component (β):
• at least one compound selected from the group consisting of compounds represented by the following formulae (3) and (4), in an amount of 10 to 90% by mass based on whole curable components:
• wherein R2 and R3 each independently represents an allyl group or a methallyl group;
• wherein R4 and R5 each independently represents an allyl group or a methallyl group;
• Component (γ):
• at least one compound selected from the group consisting of dibenzyl maleate, diphenyl maleate, dibenzyl fumarate, diphenyl fumarate, (meth)allyl 2-phenylbenzoate, (meth)allyl 3-phenylbenzoate, (meth)allyl 4-phenylbenzoate, (meth)allyl α-naphthoate, (meth)allyl β-naphthoate, (meth)allyl o-chlorobenzoate, (meth)allyl m-chlorobenzoate, (meth)allyl p-chlorobenzoate, (meth)allyl 2,6-dichlorobenzoate, (meth)allyl 2,4-dichlorobenzoate, (meth)allyl o-bromobenzoate, (meth)allyl m-bromobenzoate and (meth)allyl p-bromobenzoate, in an amount of 0 to 20% by mass based on whole curable components.