Patent ID: 6365223
Filing Date: 2002-04-02
Classification: C08G,D06P,G02B

Abstract:
A process for tinting a resin, containing sulfur, for optical materials, comprising dipping said resin containing sulfur for optical materials into a liquid comprising an organic acid and thereafter tinting said resin, wherein the organic acid is a mixture of a first compound (I) having sulfo group and a second compound (II) having phenolic hydroxyl group but not having sulfo group, and a ratio (I/II) of an amount by weight of compound (I) to an amount by weight of compound (II) is 0.01 to 2.0, and wherein the resin for optical materials, containing sulfur, is a resin obtained by curing by polymerization of a compound having one or more structures represented by formula (1) in one molecule or a composition comprising said compound, formula (1) being: 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 or O, m represents a number of 2 to 5 and n represents a number of 0 to 5.