Method of coating leather using aqueous synthetic resin dispersions

US5221284A · kind A · utility

Assignee

• BASF SE

Inventors

• Martin Meister · Bocholt, DE
• Guenter Eckert · Schifferstadt, DE
• Juergen Schmidt-Thuemmes · Schifferstadt, DE
• Albrecht Zosel · Weinheim, DE

Key dates

• Filing date: Jun 20, 1991
• Grant date: Jun 22, 1993
• Expiry date: Jun 20, 2011

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/4935
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Aqueous synthetic resin dispersions are obtainable by copolymerizing PA0 A) from 70 to 97.5 parts by weight of a monomer mixture containing PA1 a) from 40 to 75% by weight of butadiene (monomer I), PA1 b) from 25 to 60% by weight of acrylonitrile (monomer II), PA1 c) from 0 to 25% by weight of styrene (monomer III), PA1 d) from 0 to 10% by weight of one or more amides of .alpha.,.beta.-monoethylenically unsaturated monocarboxylic acids of 3 to 5 carbon atoms (monomers IV) and PA1 e) from 0 to 10% by weight of other copolymerizable monomers (monomers V) and PA0 B) from 2.5 to 30 parts by weight of one or more copolymerizable monovinyl compounds (monomers VI) in aqueous emulsion at from 30.degree. to 70.degree. C. by a method in which not less than 50% by weight of the monomer mixture A is prepolymerized to a conversion of not less than 80%, and the polymerization is then continued with the addition of the remaining monomers A and the monomers B. These dispersions are suitable as binders for protective coats on leather.