Economy chrome tanning

US4978361A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Karlheinz Fuchs · Brechen, DE
• Norbert Munch · Kelkheim, DE

Key dates

• Filing date: Apr 25, 1989
• Grant date: Dec 18, 1990
• Expiry date: Apr 25, 2009

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C14C3/06
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

Process for economy chrome tanning, which comprises pretreating the pelt prior to tanning with 0.5 to 2% by weight, preferably 0.7 to 1,2% by weight, of an aldehyde- or keto-carboxylic acid, tanning in a conventional manner and then finish-tanning with 2 to 4.5% by weight of a mixture of a chromium(III) salt, an acid-binding agent and an aromatic di- or tricarboxylic acid or a salt thereof.