Stabilization of sunscreens in cosmetic compositions

US6869598B2 · kind B2 · utility

Assignee

• Unilever Home & Personal Care USA, Division of Conopco, Inc. · US

Inventors

• Arthur Ray Love · Nutley, US
• Judith Kerschner · Ridgewood, US
• Michael James Barratt · Oak Ridge, US
• Yan Zhou · Montville, US
• Prem Chandar · Closter, US

Key dates

• Filing date: Mar 11, 2003
• Grant date: Mar 22, 2005
• Expiry date: Apr 30, 2023

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61K8/375
• WIPO field: Pharmaceuticals
• WIPO sector: Chemistry

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 R1 and R2, independently, represents a hydrogen atom, —CO—R (acyl group), —COO—R CONHR; where R represents saturated or unsaturated, linear, branched or cyclic C1-C18 hydrocarbon groups; andR3 represents (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., R3 constitutes 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.