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US 5,949,518 AGranted
Color-neutral UV blocking coating for plastic lens
AssigneeSola International, Inc.
InventorsHector Belmares, Peter W. Coldrey, Lani Sherwood, Sundar Ram
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Abstract
Polymeric coatings containing both UV absorbers and dyes are employed to produce transparent, durable film coatings that can significantly increase the level of UV radiation blockage when coated onto substrates including ophthalmic lenses. The dye comprises 1-(4-methylphenyl)amino!-4-hydroxy-9, 10-anthracenedione. The color-neutral film coatings are resistant to weather and UV degradation.
Claims9
A transparent article exhibiting low ultraviolet radiation transmittance which comprises:
- (a) a substrate;
- and
- (b) a stable color-neutral coating on a surface of said substrate wherein the coating comprises:
- (i) a polymeric matrix;
- (ii) an ultraviolet absorber;
- and
- (iii) an effective amount of a dye comprising 1-(4-methylphenyl)amino!-4-hydroxy-9, 10-anthracenedione to neutralize yellow color caused by said ultraviolet absorber.
4 more elements
Dependencies are inferred from the claim text.