Preparation of stable aqueous polymer dispersions which contain an alkenyl-aromatic compound as copolymerized units

US4661557A · kind A · utility

Assignee

• BASF SE

Inventors

• Hans-Georg Bubam · Ludwigshafen, DE
• Lothar Heider · Ludwigshafen, DE
• Uwe Biederbeck · Mutterstadt, DE
• Bernd Stanger · Dudenhofen, DE

Key dates

• Filing date: Jun 27, 1985
• Grant date: Apr 28, 1987
• Expiry date: Jun 27, 2005

Classification

• Technology area (CPC D): Textiles; Paper
• CPC primary: D21H19/58
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A process for the preparation of stable aqueous polymer dispersions which contain an alkenyl-aromatic compound as copolymerized units, by polymerizing monomer mixtures which contain PA0 (a) not less than 2% by weight of an alkenyl-aromatic compound and PA0 (b) from 0.5 to 10% by weight of an ethylenically unsaturated C.sub.3 -C.sub.5 -carboxylic acid and/or its amide and/or its nitrile and/or an ethylenically unsaturated monomer containing sulfonic acid groups, with or without PA0 (c) acrylic acid esters, methacrylic acid esters and/or butadiene in aqueous emulsion in the presence of a polymerization initiator, with or without an emulsifier and with or without a polymerization regulator, at a pH below 7, in the presence of from 0.2 to 2% by weight of formaldehyde.