Patent ID: 6201061
Filing Date: 2001-03-13
Classification: C08G,G02B

Abstract:
A process for producing a resin used for preparing an optical material which process comprises curing a composition by polymerization in the presence of a catalyst, the composition comprising an ultraviolet light absorbent and an epithio compound having, in one molecule thereof, one or more structures represented by the following formula (1): ##STR2##wherein R.sup.1 represents a hydrocarbon group having 1 to 10 carbon atoms, R.sup.2, R.sup.3 and R.sup.4 each represents a hydrogen atom or a hydrocarbon group having 1 to 10 carbon atoms, Y represents S or O and n represents 0 or 1;wherein the ultraviolet light absorbent and the catalyst are in amounts, each expressed as parts by weight per 100 parts by weight of the total amount of the epithio compound, which satisfy both of the following relationships (a) and (b):0.001.ltoreq.ultraviolet light absorbent.ltoreq.1.000 (a)0.001.ltoreq.catalyst.ltoreq.5.000 (b).