Polyester resin-based high index ophthalmic lenses having improv

Details Polyester resin-based high index ophthalmic lenses having improv Polyester resin-based high index ophthalmic lenses having improv

1997-06-27

1998-12-22

Short, Patricia A.

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

Synthetic resins

Ethylenically unsaturated reactant admixed with either...

525 11, 525 44, 525 45, 525 48, 525 49, 523507, 523510, 523511, 523518, C08L 6706

Patent

active

058521127

ABSTRACT:
Unsaturated polyester resin-based compositions that are modified for unexpected improvement in uniform, low optical distortion and/or improved tint speed by the addition of one or more additives selected from an allylic ester and/or an acrylic monomer, together with an exotherm depressant, making the modified polyester resin-based composition commercially viable for casting ophthalmic lenses. The additive(s) and exotherm depressant are useful to modify the polyester for sufficient enhancement of optical distortion and/or tint speed such that any unsaturated polyester resin, capable of producing a clear, low color casting, will be improved sufficiently to provide a composition having the required properties for an ophthalmic lens.

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Database WPI--Derwent Publications Ltd., London, GB; AN 94-080018 & JP, A, 06 032 846 (Nippon Oils & Fats Co. Ltd.), 08 Feb. 1994--see abstract.
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Boening, Herman V., "Unsaturated Polyesters:Structure And Properties", Elsevier Publishing Company, 1964, pp. 38-54.

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