High-refractivity plastic lens resin

Details High-refractivity plastic lens resin High-refractivity plastic lens resin

G - Physics

02

B

402/153

G02B 1/04 (2006.01) C08G 18/38 (2006.01) C08G 18/76 (2006.01) C08G 18/77 (2006.01)

Patent

CA 1328527

- 28 - ABSTRACT Disclosed herein are a high-refractivity plastic lens resin obtained by polymerizing under heat at least one polyisocyanate (I): Image (I) wherein X means a hydrogen, chlorine or bromine atom or a methyl or ethyl group, Z is a hydrogen atom or a methyl group, a stands for an integer of 1 - 4, b is an integer of 2 - 4, and a + b is not greater than 6 (a + b ? 6), with at least one polythiol (II): Image (II) wherein R means a methyl, ethyl, chloromethyl or bromo- methyl group, m stands for an integer of 0 - 2 and n is 4 - m and/or at least one polythiol (III): Image (III) wherein X means a hydrogen, chlorine or bromine atom or a methyl or ethyl group, Y denotes an oxygen or sulfur atom, r stands for 0 or 1, s is an integer of 0 - 2, p is an integer of 2 - 4, q is an integer of 1 - 4 and p + q is not greater than 6 (p + q ? 6), in such amounts that the -NCO/-SH molar ratio falls within 0.5 - 3.0, as well as a lens made of the above resin.

530645

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