Patent ID: 6534589
Filing Date: 2003-03-18
Classification: C08G,G02B

Abstract:
A process for producing a resin having a large refractive index, which comprises curing by polymerization a composition comprising 10% by weight or more of an episulfide compound having one or more epithio structures in one molecule in the presence of a polymerization catalyst and 0.001 to 3.0 parts by weight of at least one phenol derivative per 100 parts by weight of the composition, the epithio structure being represented by the formula (1): wherein R1 represents a hydrocarbon group having 1 to 10 carbon atoms, R2, R3 and R4 each represents hydrogen atom or a hydrocarbon group having 1 to 10 carbon atoms, Y represents S, O, Se or Te, and m and n each represents 0 or 1, and the at least one phenol derivative being selected from the group consisting of a polyhydric phenol and a halogenated phenol.