Production of photopolymerized polyester high index ophthalmic l

Details Production of photopolymerized polyester high index ophthalmic l Production of photopolymerized polyester high index ophthalmic l

1997-09-04

2000-08-08

Short, Patricia A.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

351159, 264 11, 264496, 522 18, 522 28, 522 42, 522 64, 522107, G02C 702

Patent

active

060991232

ABSTRACT:
Unsaturated polyester resin-based ophthalmic lens compositions that are modified for unexpected improvement in speed of manufacture while maintaining uniform, low optical distortion and/or improved tint speed by the addition to the polyester composition of at least one photoinitiator, preferably having at least some activity at a wavelength above about 380 nm so that a UV-absorbing compound can be included in the polyester lens composition, and the polyester resin composition is photocured to gelation in about 7 minutes or less, e.g., using a light intensity of at least about 300 microwatts/cm.sup.2, more preferably at least about 500 microwatts/cm.sup.2, most preferably at least about 1,000 microwatts/cm.sup.2.

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