Patent ID: 9447226
Filing Date: 2016-09-20
CPC Classification: C08G,G02B

Claim Text:
1. A composition for optical materials, which comprises (a) a compound described below, (b) a compound described below, (c) a polyisocyanate and (d) a polythiol: the compound (a): a compound having the structure represented by the following formula (1): wherein m represents an integer from 0 to 4, and n represents an integer from 0 to 2; and the compound (b): a compound having the structure represented by the following formula (2): wherein m represents an integer from 0 to 4, and n represents an integer from 0 to 2, and wherein, when the total amount of the compound (a), the compound (b), the polyisocyanate (c) and the polythiol (d) is 100% by mass, the compound (a) is in an amount of 50 to 95% by mass; the compound (b) is in an amount of 0.05 to 20% by mass; the polyisocyanate (c) is in an amount of 1 to 25% by mass; and the polythiol (d) is in an amount of 1 to 25% by mass, and wherein the ratio of the SH groups in the polythiol (d) to the NCO groups in the polyisocyanate (c), [the number of the SH groups in the polythiol (d)/the number of the NCO groups in the polyisocyanate (c)] is 1.0 to 2.5.