| 摘要 |
PURPOSE:To form a high-refractive index resin composition which can give an optical material excelling in light resistance and having a refractive index >=1.58, by mixing an adduct of divinylbenzene with a specified polytiol compound with a specified polymerizable monomer and a polymerizable monomer copolymerizable with these two components. CONSTITUTION:This composition contains 30-80wt.% liquid, high-refractive index, vinyl group-terminated polymerizable thioether monomer mixture [A] obtained by performing an addition reaction of divinylbenzene with a polythiol compound of formula I (wherein R<1> is a 2-10C n-valent polyalcohol residue, m is 1 or 2 and n is an integer of 2-4) in the presence of a radical initiator at a functional group equivalent ratio of the vinyl groups of the divinylbenzene to the thiol groups of the polythiol compound in the range of 3-10, 10-40wt.% polymerizable monomer [B] of formula II (wherein R<2> is H or CH3, R<3> is -CH2CH2O- or the like, Ar is a bivalent phenolic group, p is 1-3, and q is 0-4) and 0-40wt.% polymerizable monomer [C] copolymerizable with components A and B and having a refractive index >=1.54 (A+B+C=100wt.%).
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