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AssigneeMitsui Toatsu Chemicals, Inc.
InventorsYoshinobu Kanemura, Masao Imai, Katsuyoshi Sasagawa, Nobuyuki Kajimoto, Teruyuki Nagata
Estimating the term…
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.
A high-refractivity plastic lens resin consisting essentially of a polymeric reaction product obtained by copolymerizing under heat at least one polyisocyanate component with at least one polythiol component:
A high-refractivity plastic lens resin consisting essentially of a polymeric reaction product obtained by polymerizing under heat at least one polyisocyanate of formula (I) ##STR10## with at least one polythiol of formula (II) or (III);
A lens consisting essentially of a copolymer obtained by copolymerizing under heat at least one polyisocyanate component and one polythiol component,
A lens consisting essentially of a copolymer obtained by copolymerizing under heat at least one polyisocyanate of formula (I) ##STR14## with at least one polythiol of formula (II) or (III):
Dependencies are inferred from the claim text.