Resin for urethane lenses, lenses comprising the resin, and a pr

Details Resin for urethane lenses, lenses comprising the resin, and a pr Resin for urethane lenses, lenses comprising the resin, and a pr

1990-10-03

1991-10-22

Welsh, Maurice J.

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 74, C08G 1875

Patent

active

050596730

ABSTRACT:
A resin for urethane lenses is here disclosed which is obtained by reacting an alicyclic isocyanate compound represented by the formula (I) ##STR1## and/or an alicyclic isocyanate compound represented by the formula (II) ##STR2## with at least one active hydrogen compound selected from the group consisting of polyol compounds, polythiol compounds except 1,2-bis[(2-mercaptoethyl)thio]-3-mercaptopropane, and thiol compounds having a hydroxyl group. In addition, lenses comprising this resin and processes for the preparation of the resin and the lenses are also disclosed herein.

REFERENCES:
patent: 4151194 (1979-04-01), Wu et al.

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