Use of aqueous solutions or dispersions of copolymers of carboxyl-group-containing monomers, ethylenically unsaturated acetals, ketals or orthocarboxylic acid esters and optionally other copolymerizable monomers as leather tanning agents

US6033442A · kind A · utility

Assignee

• BASF SE

Inventors

• Walter Denzinger · Speyer, DE
• Axel Kistenmacher · Ludwigshafen, DE
• Gerhard Wolf · Mannheim, DE
• Michael Kneip · Ludwigshafen, DE
• Norbert Greif · Worms, DE
• Knut Oppenlander · Ludwigshafen, DE

Key dates

• Filing date: Jun 10, 1998
• Grant date: Mar 7, 2000
• Expiry date: Jun 10, 2018

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C14C3/28
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The use of aqueous solutions or dispersions of copolymers composed of PA0 A) from 5 to 95 mol % of ethylenically unsaturated mono- or dicarboxylic acids having 3 to 10 carbons, their anhydrides, their alkali metal, alkaline earth metal or ammonium salts, or mixtures thereof, PA0 B) from 5 to 95 mol % of ethylenically unsaturated acetals, ketals or orthocarboxylic esters of the formula I ##STR1## where R.sup.1 to R.sup.12 independently are hydrogen or an organic radical and PA1 a to d independently are 0 or 1, and PA0 C) from 0 to 70 mol % of other copolymerizable monomers or their hydrolysis products or polymer-analogous reaction products, as tanning agents for the self-tanning, pretanning or assist tanning of leather pelts and skin pelts or for the retanning of leather and skins.