Composition for use in optical material with high refractive index and high strength

摘要

A composition for use in an optical material is disclosed which is capable of providing an optical material satisfying a high refractive index (ne is 1.73 or more), a high strength (an elongation is 10% or more in a three-point bending test and drilling resistance is good), and a high thermostability (a softening point measured by TMA is 70° C. or higher). The optical material such as a lens for two-point frame spectacles is formed by polymerizing and curing a composition for use in an optical resin material containing (a) an inorganic compound having a sulfur atom and/or a selenium atom, (b) an episulfide compound, and (c) a xylylenedithiol compound.

主权项

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.