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

1997-06-13

1999-03-23

Short, Patricia A.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

351159, 264 11, 264 132, 523105, 523307, 523510, 523518, 525 49, G02C 702

Patent

active

058867643

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.
Database WPI--Derewnt Publications Ltd., London, GB; AN 91-032018 & JP, A, 02 300 221 (Nippon Oils & Fats Co. Ltd). 12 Dec. 1990--see abstract.
Boenig, Herman V., "Unsaturated Polyesters:Structure And Properties", Elsevier Publishing Company, 1964, pp. 38-54.

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