High-refractivity plastic lens resin formed by reacting at least

Details High-refractivity plastic lens resin formed by reacting at least High-refractivity plastic lens resin formed by reacting at least

1987-02-27

1988-10-04

Anderson, Harold D.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From reactant having at least one -n=c=x group as well as...

528 77, 528 79, 528 80, 528 81, C08G 1832, C08G 1870, C08G 1834

Patent

active

047757337

ABSTRACT:
Disclosed herein are a high-refractivity plastic lens resin obtained by polymerizing under heat at least one polyisocyanate (I): ##STR1## 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.ltoreq.6), with at least one polythiol (II): ##STR2## wherein R means a methyl, ethyl, chloromethyl or bromomethyl group, m stands for an integer of 0-2 and n is 4-m and/or at least one polythiol (III): ##STR3## 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.ltoreq.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.

REFERENCES:
patent: 4094843 (1978-12-01), McGinniss
patent: 4342863 (1982-08-01), Hohokabe et al.
patent: 4605712 (1986-08-01), Mueller et al.
patent: 4689387 (1987-08-01), Kajimoto et al.

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