Patent ID: 9150694
Filing Date: 2015-10-06
Classification: C08G,C08L,G02B

Abstract:
1. A composition for use in an optical material comprising: (a) 1-50 parts by weight of an inorganic compound having sulfur atom(s) and/or selenium atom(s); (b) 50-99 parts by weight of at least one of episulfide compounds selected from the group consisting of bis(β-epithiopropyl)sulfide, bis(β-epithiopropyl)disulfide, bis(β-epithiopropyl)trisulfide, bis(β-epithiopropylthio)methane, 1,2-bis(β-epithiopropylthio)ethane, 1,3-bis(β-epithiopropylthio)propane, 1,2-bis(β-epithiopropylthio)propane, 1,4-bis(β-epithiopropylthio)butane and bis(β-epithiopropylthioethyl)sulfide, the sum of (a) and (b) being 100 parts by weight; and (c) 1-50 parts by weight of a xylylenedithiol compound based upon the sum of (a) and (b), which is 100 parts by weight, wherein 50-100% by weight of each of said inorganic compound (a) and said episulfide compound (b) are contained as a prepolymerization reactant of the inorganic compound (a) and the episulfide compound (b), and said composition for use in an optical material does not comprise a xylylene diisocyanate compound.