Patent ID: 9529117
Filing Date: 2016-12-27
CPC Classification: C08G,G02B

Claim Text:
1. A polymerizable composition for optical materials, which comprises: a preliminary reaction solution obtained by subjecting 10 to 50 parts by mass of the below-described compound (a) and 1 to 20 parts by mass of the below-described compound (c) to a prepolymerization reaction in the presence of 50 to 90 parts by mass of the below-described compound (b) with the proviso that the total amount of the compound (a) and the compound (b) is 100 parts by mass, using 0.001 to 5 parts by mass of the below-described compound (d) as a prepolymerization catalyst; and a polymerization catalyst: (a) sulfur (the compound (a)); (b) a compound having two intramolecular episulfide groups represented by the following formula (1) (the compound (b)): wherein m represents an integer from 0 to 4, and n represents an integer from 0 to 1; (c) a compound having one or more SH groups (the compound (c)); (d) a compound represented by the following formula (2) (the compound (d)): wherein R represents an alkyl group having 1 to 4 carbon atoms, and X represents an organic group having 2 to 11 carbon atoms, which has any of a vinyl group, a vinylidene group and a vinylene group,