Process for dressing leather by a treatment using rubber latices

US4330597A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Ferdinand Heins · Monheim, DE
• Leo Tork · Leverkusen, DE
• Wolfgang Hohne · Bensberg, DE

Key dates

• Filing date: Nov 12, 1980
• Grant date: May 18, 1982
• Expiry date: Nov 12, 2000

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/4935
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

Advantages in the dressing of leather, especially of split leather, with a synthetic rubber latex are obtained if in the leather dressing, the rubber latex is reacted with from 0.5 to 50% by weight, based on solid rubber, of one or more oxides and/or hydroxides of one or more bivalent metals and the leather is treated with a non-polymerized rubber latex which is produced in a one-stage process up to a monomer conversion of from 70 to 95% by weight, by emulsion polymerization of: PA1 (A) from 1 to 10 parts by weight of one or more .alpha.,.beta.-monoethylenically unsaturated carboxylic acids; and PA1 (B) from 90 to 99 parts by weight of a mixture of PA2 (a) from 10 to 90 parts by weight of butadiene and PA2 (b) from 10 to 90 parts by weight of styrene and/or acrylonitrile, wherein the quantity of acrylonitrile in the mixture amounts to a maximum of 50 parts by weight.