Use of cholesteric, liquid-crystalline compositions as UV filters in cosmetic and pharmaceutical preparations

US6060042A · kind A · utility

Assignee

• BASF SE

Inventors

• Peter Schuhmacher · Mannheim, DE
• Norbert Schneider · Schorndorf, DE
• Horst Westenfelder · Neustadt, DE
• Sylke Haremza · Neckargemünd, DE
• Thorsten Habeck · Meckenheim, DE
• Frank Meyer · Mannheim, DE

Key dates

• Filing date: Jun 3, 1999
• Grant date: May 9, 2000
• Expiry date: Jun 3, 2019

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61Q19/001
• WIPO field: Pharmaceuticals
• WIPO sector: Chemistry

Abstract

The use of cholesteric, liquid-crystalline compositions comprising PA1 a) at least one chiral, liquid-crystalline, polymerizable monomer of the formula I, EQU [Z.sup.1 -Y.sup.1 -(A.sup.1).sub.m -Y.sup.2 -M.sup.1 -Y.sup.3 -].sub.n -XI PA1 by means of which a cholesteric, liquid-crystalline phase with a pitch of less than 450 nm can be obtained, PA1 or PA1 b) a mixture of PA2 b.sub.1) at least one achiral, liquid-crystalline, polymerizable monomer of the formula II EQU Z.sup.2 -Y.sup.4 -(A.sup.2)-.sub.o -Y.sup.5 -M.sup.2 -Y.sup.6 -(A.sup.3).sub.p -Y.sup.7 -Z.sup.3 lI PA2 and PA2 b.sub.2) at least one chiral additive by means of which a cholesteric, liquid-crystalline phase with a pitch of less than 450 nm can be obtained, where the variables are as defined in the description, as UV filters in cosmetic and pharmaceutical preparations for protecting the human skin or human hair against sunlight, alone or together with UV-absorbent compounds which are known per se for cosmetic and pharmaceutical preparations.