Photostabilizers, UV absorbers, and methods of photostabilizing a sunscreen composition
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United States of America Patent
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Aug 9, 2005
Grant Date -
Mar 25, 2004
app pub date -
Sep 17, 2002
filing date -
Sep 17, 2002
priority date (Note) -
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Abstract
Derivatives of fluorene, including diesters and polyesters of diphenylmethylenemalonic acid and derivatives of cyano(9H-fluoren-9-ylidene) acetic acid; and sunscreen compositions including a mixture of a photoactive compound and any one of the foregoing derivatives are disclosed herein. Also disclosed are methods for stabilizing a sunscreen composition by the addition of one or more of the foregoing derivatives and methods of filtering out ultra-violet light from a substrate by the use of one or more such derivatives.
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