Resin for plastic lens having high-refractive index, lens compri

Details Resin for plastic lens having high-refractive index, lens compri Resin for plastic lens having high-refractive index, lens compri

1989-02-15

1991-06-04

Welsh, Maurice J.

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

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

524714, 524730, 524731, 524795, 528 76, 528 83, 528 85, C08L 7500

Patent

active

050215035

ABSTRACT:
The present invention relates to resin useful in preparing plastic lenses having a high refractive index comprising reacting an aliphatic polyisocyanate compounds having at least one sulfur atom with one or more of active hydrogen compounds selected from the group consisting of a polyol, a polythiol having sulfur atoms only in a mercapto groups, and a polythiol having at least one sulfur atom other than in the mercapto groups; lenses containing the above-mentioned resin; and a method for the preparation thereof characterized by adding an internal release agent to the mixture of the above-mentioned raw materials in casting lenses from the resin; and lenses obtained by this method.

REFERENCES:
patent: 4086211 (1978-04-01), Nakauchi et al.
patent: 4146696 (1979-03-01), Bond et al.
patent: 4504313 (1985-03-01), Robertson
patent: 4775733 (1988-10-01), Kanemura et al.
patent: 4780522 (1988-10-01), Kajimoto et al.

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