LENS MADE OF SYNTHETIC RESIN AND PROCESS FOR PRODUCING THE SAME

摘要

An optical lens material which not only sufficiently has properties required of an optical lens, such as impact resistance and dyeability, but has all of a high refractive index, a high Abbe's number, and a low specific gravity, and which can be produced also through photopolymerization. It is a lens made of a synthetic resin and is characterized by comprising a copolymer of a composition which comprises 20 to 80 wt.% bis-2-methacryloylthioethyl sulfide, represented by the following structural formula (1), 5 to 50 wt.% thiol having a functionality of 2 or higher, and 0 to 75 wt.% monomer(s) copolymerizable with these and preferably further contains 5 to 50 wt.% bifunctional (meth)acrylic compound, and by having a refractive index of 1.58 or higher, an Abbe's number of 35 or higher, and a specific gravity of 1.35 or lower. CH>2<=C(CH>3<)COSCH>2<CH>2<SCH>2<CH>2<SCOC(CH>3<)=CH>2< structural formula (1)