To provide a synthetic resin lens having high refractive index, high Abbe's number, good optical characteristics and mechanical characteristics without requiring the use of isocyanate compds. in the production line.
This lens is a high refractive synthetic resin lens having ≥1.58 refractive index and ≥35 Abbe's number and is obtd. by radical polymn. of the compsn. described below. The compsn. is prepared by mixing 30 to 70 pts.wt of the component (A) comprising the reaction product of 1 to 15 pts.wt. of aliphatic polyfunctional acryl or methacryl monomers having acryl or methacryl groups with ≥3 functional groups, 2 to 15 pts.wt. of tetramethylxylylene diisocyanate and 70 to 96 pts.wt. of dithiol having ≥25% sulfur content, and 70 to 30 pts.wt. of the component (B) comprising a mixture of 50 to 80 pts.wt. of aliphatic polyfunctional acryl or methacryl monomers having acryl or methacryl groups with ≥3 functional groups and 20 to 50 pts.wt. of divinylbenzene.
OSHIKIRI TATSUYA
UNO KENJI
Next Patent: PLASTIC LENS, ITS PRODUCTION AND PRIMER COMPOSITION