Water based concentrated product forms of oil-soluble organic UV absorbers

US11103733B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Stefan Muller · Weil am Rhein, DE
• Brigitte LINDEMANN · Weil am Rhein, DE
• Bernd Herzog · Weil am Rhein, DE

Key dates

• Filing date: Jun 30, 2008
• Grant date: Aug 31, 2021
• Expiry date: Jun 19, 2029

Classification

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

Abstract

The instant invention refers to the use of a concentrated aqueous polymer dispersion with an average particle size of less than 1000 nm comprising (a) a polymer carrier prepared by heterophase radical polymerization of at least one ethylenically unsaturated monomer in the presence of (b) an oil-soluble organic UV absorber selected from the class of p-aminobenzoic acid derivatives; salicylic acid derivatives; benzophenone derivatives; diphenyl acrylate derivatives; benzofuran derivatives; polymeric UV absorbers, comprising one or more organosilicon radicals; cinnamic acid derivatives; camphor derivatives; s-triazine derivatives; trianilino-s-triazine derivatives; menthyl anthranilates; and benzotriazole derivatives; wherein the weight ratio of the oil-soluble organic UV absorber (b) to polymer carrier (a) is greater than 50 parts UV absorber per 100 parts of carrier; for the protection of human and animal hair and skin against the damaging effect of UV radiation. The concentrated aqueous polymer dispersions show unexpectedly high sunscreen effects and a positive skin feeling.