Preparation of finely divided, water-soluble polymers containing vinylamine units

US5290880A · kind A · utility

Assignee

• BASF SE

Inventors

• Dietmar Moench · Weinheim, DE
• Michael Kroener · Mannheim, DE
• Enrique Freudenberg · Schifferstadt, DE
• Heinrich Hartmann · Schifferstadt, DE
• Norbert Sendhoff · Havelsee, DE

Key dates

• Filing date: Feb 27, 1991
• Grant date: Mar 1, 1994
• Expiry date: Feb 27, 2011

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F8/44
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

N-vinylformamide is polymerized with or without other water-soluble monoethylenically unsaturated monomers and with or without water-insoluble monoethylenically unsaturated monomers in not less than 30% strength by weight aqueous monomer solutions in the presence of a polymerization initiator at not more than 150.degree. C. in a kneader by a method in which the polymerization is carried out to such an extent that the initially formed water-containing polymer gel disintegrates into fine particles and the finely divided polymer obtainable in this manner is hydrolyzed, preferably in the kneader, so that not less than 0.1 mol % of the N-vinylformamide units present in the polymer are converted into vinylamine units. The polymers obtainable in this manner dissolve readily in water. The aqueous solutions are used, for example, in papermaking and tertiary oil production.