High refractive index plastic lens and composition therefor

Details High refractive index plastic lens and composition therefor High refractive index plastic lens and composition therefor

1993-07-23

1994-04-26

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...

C08G 1832

Patent

active

053067991

ABSTRACT:
The present invention discloses a composition for high refractive index plastic lens consisting of a monomer mixture wherein a particular aliphatic thiol compound is added to a polyisocyanate represented by general formula (1): ##STR1## wherein each X represents a hydrogen atom or a methyl group; each R represents a chlorine atom, a bromine atom, a methyl group or an ethyl group; m represents an integer of 0-4; and n represents an integer of 2-4, and a polythiol of formula (2): ##STR2## and a high refractive index plastic lens made of a urethane-containing resin obtained by polymerizing said composition.

REFERENCES:
patent: 4775733 (1988-10-01), Kanemura et al.
patent: 5191055 (1993-03-01), Kanemura et al.

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