Light fatigue resistant photochromic formulations
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United States of America Patent
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Dec 16, 1997
Grant Date -
N/A
app pub date -
May 25, 1995
filing date -
May 25, 1995
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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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