Process for preparing low-salt preparations of condensation products

US5888400A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Edzard Tholema · Odenthal, DE
• Wolfgang Zarges · Neunburg vorm Wald, DE
• Harro Traubel · Leverkusen, DE

Key dates

• Filing date: Jun 20, 1997
• Grant date: Mar 30, 1999
• Expiry date: Jun 20, 2017

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G10/00
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A process for preparing low-salt preparations of condensation products based on PA1 A) sulphonated aromatics, PA1 B) aldehydes and/or ketones and optionally PA1 C) one or more compounds selected from the group consisting of nonsulphonated aromatics, urea and urea derivatives, characterized in that inorganic acid present after the condensation is separated off in whole or in part from the condensation product, optionally in the form of its salts after neutralization, until the inorganic salt content is less than 10% by weight, relative to the preparation, leads to preparations which are outstandingly suitable as tanning agents, dispersants and liquefiers.