Use of copolymers based on long-chain alkyl vinyl ethers and ethylenically unsaturated dicarboxylic anhydrides for rendering leathers and skins water-repellent

US5286263A · kind A · utility

Assignee

• BASF SE

Inventors

• Ortwin Schaffer · Ludwigshafen, DE
• Herbert Bay · Reutlingen, DE
• Karl Stork · Eisenberg (Pfalz), DE
• Norbert Greif · Worms, DE
• Knut Oppenlaender · Ludwigshafen, DE
• Walter Denzinger · Speyer, DE
• Heinrich Hartmann · Schifferstadt, DE

Key dates

• Filing date: Feb 10, 1992
• Grant date: Feb 15, 1994
• Expiry date: Feb 10, 2012

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F8/44
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Copolymers which are obtainable by free radical copolymerization of (a) C.sub.8 -C.sub.40 -alkyl vinyl ethers, if necessary as a mixture with not more than 50 mol % of C.sub.8 -C.sub.40 -monoolefins, with (b) ethylenically unsaturated C.sub.4 -C.sub.8 -dicarboxylic anhydrides at from 80.degree. to 300.degree. C. to give copolymers having molecular weights of from 500 to 20,000 g/mol, subsequent solvolysis of the anhydride groups of the copolymers and partial or complete neutralization of the carboxyl groups formed during the solvolysis, in an aqueous medium by means of a base, and which are present in the form of aqueous dispersions or solutions, are used as agents for imparting water repellency to leathers and skins.