Condensates of bis-(4-hydroxyphenyl) sulfone as tanning assistants, their preparation and use in the tanning of leather

US4936864A · kind A · utility

Assignee

• BASF SE

Inventors

• Rolf Fikentscher · Ludwigshafen, DE
• Dietrich Lach
• Ortwin Schaffer · Ludwigshafen, DE
• Rolf Streicher · Worms, DE
• Alfred Oftring · Bad Dürkheim, DE

Key dates

• Filing date: Sep 20, 1988
• Grant date: Jun 26, 1990
• Expiry date: Sep 20, 2008

Classification

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

Abstract

A condensate of bis-(4-hydroxyphenyl) sulfone, an aldehyde, a dialdehyde and/or glyoxylic acid and aminoacetic acid or an N-substituted aminoacetic acid is prepared and used as a tanning assistant, in a process for tanning leather in combination with, in particular, aluminum tanning agents.