High-refractivity plastic lens resin

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

1992-04-29

1993-08-10

Schofer, Joseph L.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

5263075, 526310, 526313, C08F 2602, C08F21608, C08F 1224

Patent

active

052350142

ABSTRACT:
Disclosed herein are a high-refractive plastic lens resin consisting of a polymeric reaction product obtained by an addition reaction under heat of at least one polyisocyanate represented by the following general formula (I): ##STR1## wherein X is a hydrogen, chlorine or bromine atom or a methyl or ethyl group, Z is a hydrogen atom or a methyl group, 1.ltoreq.a.ltoreq.4, 2.ltoreq.b.ltoreq.4, and a+b.ltoreq.6, with at least one allyl group compound represented by the following general formula (II): ##STR2## wherein R.sub.1 is a phenol, hydroxyl, or amine group, in such amounts that the --NCO/--OH+--NH.sub.2 molar ratio fall within the range from 0.45 to 0.50.

REFERENCES:
patent: 4443588 (1984-04-01), Fukuda et al.

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