Stabilization of sunscreens in cosmetic compositions

Details Stabilization of sunscreens in cosmetic compositions Stabilization of sunscreens in cosmetic compositions

2005-03-22

2005-03-22

Dodson, Shelley A. (Department: 1616)

Drug, bio-affecting and body treating compositions

Topical sun or radiation screening, or tanning preparations

C424S060000, C424S400000, C424S401000

Reexamination Certificate

active

06869598

ABSTRACT:
Cosmetic compositions containing organic sunscreens along with a 4-substituted resorcinol derivatives of general formula I exhibit improved storage stability and oxidative stability:where each R1and R2, independently, represents a hydrogen atom, —CO—R (acyl group), —COO—R CONHR; where R represents saturated or unsaturated, linear, branched or cyclic C1-C18hydrocarbon groups; andR3represents (1) an alkyl group, having from 1 to 18 carbon atoms, preferably having from 2 to 12 carbon atoms, with or without substitution of one or more hydrogen atoms of a linear alkyl group with a methyl or ethyl group; e.g., R3constitutes linear or branched chain alkyls, or (2) a group of the general formula formula (II)Where X is preferably H, n is 0 to 3 and the dashed lines represents an optional double bond.

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International Search Report No. PCT/EP 03/02656, dated Jul. 2, 2003, 3 pp. Database WPI Derwent XP002244752—abstract of JP 06 056641 A.

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