Photostable cosmetic filter composition containing a UV-A filter and a substituted dialkylbenzalmalonate, the use of substituted dialkylbenzalmalonates in cosmetics as broad-band solar filters and novel substituted dialkylmalonates
US5670140A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 24, 1996 |
| Grant date | Sep 23, 1997 |
| Priority date | — |
| Expiry date | Oct 24, 2016 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61K2800/52
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.