Dyeing of grain leather

US4272243A · kind A · utility

Assignee

• BASF SE

Inventors

• Dietrich Lach
• Rolf Streicher · Worms, DE
• Franz Feichtmayr

Key dates

• Filing date: Dec 12, 1979
• Grant date: Jun 9, 1981
• Expiry date: Dec 12, 1999

Classification

• Technology area (CPC D): Textiles; Paper
• CPC primary: D06P3/326
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

A process for dyeing grain leather with anionic dyes under the conventional conditions for exhaustion methods, in the presence of two specific surfactants. The combined use of the two surfactants results, in the case of cationically tanned (essentially mineral-tanned) leather, in an improvement in the levelness and dye penetration and in the case of anionically tanned (synthetics-tanned or vegetable-tanned) or retanned leather, in an increase in depth of the color. The two surfactants are PA1 (a) an aliphatic alcohol of 9 to 24 carbon atoms oxyethylated with from 3 to 120 ethylene oxide units and PA1 (b) an aliphatic amine of 8 to 20 carbon atoms oxyethylated with from 6 to 80 ethylene oxide units, and they are used in a weight ratio of a:b of from 1:4 to 4:1 and in a total amount of from 0.3 to 3%, based on shaved weight.