Preparation of stable water-in-oil emulsions of hydrolyzed polymers of N-vinylamides

US5126395A · kind A · utility

Assignee

• BASF SE

Inventors

• Lutz End · Mannheim, DE
• Walter Denzinger · Speyer, DE
• Michael Kroener · Mannheim, DE
• Norbert Sendhoff · Havelsee, DE
• Enrique Freudenberg · Schifferstadt, DE
• Friedrich Linhart · Heidelberg, DE
• Rolf Fikentscher · Ludwigshafen, DE
• Heinrich Hartmann · Schifferstadt, DE

Key dates

• Filing date: Feb 28, 1990
• Grant date: Jun 30, 1992
• Expiry date: Feb 28, 2010

Classification

• Technology area (CPC D): Textiles; Paper
• CPC primary: D21H17/34
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Stable water-in-oil emulsions of a hydrolyzed polymer of an N-vinylamide of the formula ##STR1## where R and R.sup.1 are each H or C.sub.1 -C.sub.6 -alkyl, are prepared by polymerizing a compound of the formula I, alone or as a mixture with other monoethylenically unsaturated monomers, in the form of a water-in-oil emulsion to give a water-in-oil polymer emulsion, and then hydrolyzing the polymer, hydrolysis of the polymer in the form of the water-in-oil polymer emulsion being carried out in the presence of an acid or base, and additives in the form of antioxidants, reducing agents or aldehyde acceptors being added for stabilization.