Photostable cosmetic filter composition containing a UV-A filter

Details Photostable cosmetic filter composition containing a UV-A filter Photostable cosmetic filter composition containing a UV-A filter

1996-10-24

1997-09-23

Dodson, Shelley A.

Drug, bio-affecting and body treating compositions

Topical sun or radiation screening, or tanning preparations

424 60, 424400, 424401, 560 55, 568580, A61K 740, A61K 742

Patent

active

056701403

ABSTRACT:
A photostable cosmetic filter composition for protecting human skin against UV radiation at wavelengths between 280 and 380 nm comprises, in a cosmetically acceptable support medium containing at least one oily phase, 1 to 3% by weight of a dibenzoylmethane derivative and at least 1% by weight of a substituted dialkylbenzalmalonate having formula I: ##STR1## R.sub.1 and R.sub.3 may be identical or different and represent H or a straight- or branched-chain C.sub.1 -C.sub.8 alkoxy radical.
R.sub.2 and R.sub.4 represent a straight- or branched-chain C.sub.1 -C.sub.8 alkyl radical.
The molar ratio of compound (I) to the dibenzoylmethane derivative is greater than or equal to 0.6.

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patent: 4322455 (1982-03-01), Olson et al.
patent: 4387089 (1983-06-01), DePolo
patent: 4524165 (1985-06-01), Musser et al.
Chemical Abstracts, vol. 75, 1971, p. 327, No. 48636n, Columbus, Ohio. Avetisyan et al.: "Derivatives of dibasic carboxylic acids. XXXIV: N-Methyl-alpha-(p-alkoxyphenyl)succinimides."
Chemical Abstracts, vol. 83, 1975, p. 507, No. 113874v, Columbus, Ohio. Bhatt et al.: "Preparation of optically active benzylidenes by the Knoevenagel reactionof (+)-di(2-methylbutyl)malonate".

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