Sunscreen concentrate

US5916544A · kind A · utility

Assignee

• ISP Investments LLC · US

Inventors

• Kou-Chang Liu · Appleton, US
• Michael W. Helioff · Westfield, US
• Mark Rerek · Fanwood, US
• Mary Davis · Suffern, US
• Lawrence J. Grenner · Glen Rock, US
• David E. Graham · Fleet, GB
• Anja Waldorf-Geber · Rübhausen, DE
• Renate Koppel · Neunburg vorm Wald, DE

Key dates

• Filing date: Nov 12, 1997
• Grant date: Jun 29, 1999
• Expiry date: Nov 12, 2017

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61K2800/413
• WIPO field: Pharmaceuticals
• WIPO sector: Chemistry

Abstract

A sunscreen concentrate in the form of a stable, uniform dispersion comprising, by weight: PA1 (a) about 30-65% of ultrafine titanium dioxide or zinc oxide, or mixtures thereof, PA1 (b) about 30-70% of an organic sunscreen agent, and PA1 (c) about 0.25-25% of a dispersing aid which is polyvinylpyrrolidone alkylated with a C.sub.4 -C.sub.36 alpha-olefin.