Use of benzimidazole derivatives as light protection filters

US5501850A · kind A · utility

Assignee

• Merck Patent GmbH · DE

Inventors

• Ingeborg Stein · Langen (Hessen), DE
• Ulrich Heywang · Darmstadt, DE
• Alexander Putz · Michelstadt, DE
• Roland Martin · Hamburg, DE

Key dates

• Filing date: Oct 13, 1993
• Grant date: Mar 26, 1996
• Expiry date: Oct 13, 2013

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07D235/20
• WIPO field: Pharmaceuticals
• WIPO sector: Chemistry

Abstract

The invention relates to the use of benzimidazole derivatives of the formula I, ##STR1## where R.sup.1, R.sup.2, R.sup.3, R.sup.4 and Ar have the meaning given in claim 1, as light protection filters in cosmetic formulations, at least one of the radicals R.sup.1 to R.sup.4 or an alkyl or alkoxy substituent of the group Ar containing at least 4 C atoms.