Process for producing polyurethane lens

Details Process for producing polyurethane lens Process for producing polyurethane lens

1988-09-13

1990-12-04

Silverman, Stanley

Stock material or miscellaneous articles

Composite

Of epoxy ether

427163, 264 11, 264 17, 264 26, 523106, B32B 2738, B05D 506

Patent

active

049753282

ABSTRACT:
A polyurethane lens is produced by (a) adding to a monomer mixture comprising a polyisocyanate and a polythiol, a phosphoric acid ester represented by the general formula (I) ##STR1## (R.sub.1 and R.sub.2 which may be the same or different are each an alkyl group of 1-8 carbon atoms) and then (b) subjecting the monomer mixture containing the phosphoric acid ester, obtained in the step (a) to cast polymerization in a mold for plastic lens production. Said polyurethane lens has good releasability from mold, is free from color unevenness after tinting and cloudiness, and possesses high refractive index (N.sub.D) and high optical dispersion.

REFERENCES:
patent: 4603158 (1986-07-01), Markham et al.

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