Use of hydrolyzed copolymers of N-vinylcarboxamides and monoethylenically unsaturated carboxylic acids in papermaking

US5630907A · kind A · utility

Assignee

• BASF SE

Inventors

• Claudia Nilz · Rödersheim-Gronau, DE
• Walter Denzinger · Speyer, DE
• Heinrich Hartmann · Schifferstadt, DE
• Michael Kroener · Mannheim, DE
• Friedrich Linhart · Heidelberg, DE
• Rudolf Schuhmacher · Böhl-Iggelheim, DE
• Dietmar Moench · Weinheim, DE
• Andreas Stange · Mannheim, DE

Key dates

• Filing date: May 21, 1996
• Grant date: May 20, 1997
• Expiry date: May 21, 2016

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F2810/50
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Copolymers which are obtained by copolymerization of a) from 5 to 99 mol % of N-vinylcarboxamides, b) from 95 to 1 mol % of monoethylenically unsaturated carboxylic acids and/or the alkali metal, alkaline earth metal, ammonium or amine salts thereof, and if required, c) up to 30 mol % of other monoethylenically unsaturated compounds, and if required, d) up to 2 mol % of crosslinking agents, and subsequent partial or complete elimination of the acyl groups from the N-vinylcarboxamides polymerized in the copolymer, with formation of amino or ammonium groups, are used as additives to paper stock for increasing the drainage rate and the retention in papermaking, and the dry and wet strength of the paper.