Photostabilization of retinoids with alkoxycrylene compounds

Compositions – Light transmission modifying compositions – Ultraviolet

Reexamination Certificate

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C424S059000, C424S060000, C424S401000, C424S094100, C514S337000, C514S532000, C514S557000, C514S569000, C514S703000, C524S090000, C558S410000, C546S280100, C560S061000, C562S471000, C562S490000, C562S510000, C568S446000, C568S823000

Reexamination Certificate

active

08070989

ABSTRACT:
The photostabilizing electronic excited state energy—particularly singlet state energy from retinoid compounds—has been found to be readily transferred to (accepted by) α-cyanodiphenylacrylate compounds having an alkoxy radical in the four (para) position (hereinafter “alkoxycrylenes”) on one of the phenyl rings having the formula (I):wherein one of R1and R2is a straight or branched chain C1-C30alkoxy radical, preferably C1-C8, more preferably methoxy, and the non-alkoxy radical R1or R2is hydrogen; and R3is a straight or branched chain C1-C30alkyl radical, preferably C2-C20. The alkoxycrylene compounds of formula (I) significantly increase the photostability of retinoid compounds in a composition by at least 3-fold and as much as 10-fold or greater. The ability of the alkoxycrylene compounds to stabilize the retinoid compound is concentration dependent, with the amount of retinoid photostabilization increasing with the concentration of the alkoxycrylene compound.

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