Light fatigue resistant photochromic formulations

Details Light fatigue resistant photochromic formulations Light fatigue resistant photochromic formulations

1995-05-25

1997-12-16

Hellner, Mark

Optical: systems and elements

Optical modulator

Having particular chemical composition or structure

252582, 252586, G02F 100, F21V 900

Patent

active

056991827

ABSTRACT:
The present invention provides for light fatigue resistant photochromic compositions including a unique combination of hindered aminoether light stabilizer ("HAELS") compounds to extend the usable lifetime of naphthopyran photochromic compositions and articles. Additionally, light stabilizer compounds and hydroxyphenyl benzotriazole UV absorbers have a synergistic effect in extending the usable lifetime of photochromic compositions and articles. Specifically, certain tertiary and secondary amine HALS compounds in combination with hydroxyphenyl benzotriazole UV absorbers extend the usable lifetime of spiro-indolino-oxazine photochromic compositions and articles. Similarly, aminoether HAELS compounds in combination with hydroxyphenyl benzotriazole UV absorbers further extend the usable lifetime of the naphthopyran photochromic compositions and articles.

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