Production of paper, board and cardboard in the presence of copolymers containing N-vinylformamide units

US5262008A · kind A · utility

Assignee

• BASF SE

Inventors

• Dietmar Moench · Weinheim, DE
• Heinrich Hartmann · Schifferstadt, DE
• Enrique Freudenberg · Schifferstadt, DE
• Andreas Stange · Mannheim, DE

Key dates

• Filing date: Dec 4, 1990
• Grant date: Nov 16, 1993
• Expiry date: Dec 4, 2010

Classification

• Technology area (CPC D): Textiles; Paper
• CPC primary: D21H17/455
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

Paper, board and cardboard are produced by draining a paper stock in the presence of a nonhydrolyzed copolymer which contains, as polymerized units, PA0 (a) from 99 to 1 mol % of N-vinylformamide and PA0 (b) from 1 to 99 mol % of one or more water-soluble basic monomers of the formula ##STR1## where R.sup.1 is H, CH.sub.3 or C.sub.2 H.sub.5, R.sup.2, R.sup.3 and R.sup.4 are each H, CH.sub.3, C.sub.2 H.sub.5 or (--CH.sub.2 --CH.sub.2 --O--).sub.n H, R.sup.5 and R.sup.6 are each C.sub.1 -C.sub.10 -alkyl, A is C.sub.1 -C.sub.6 -alkylene, n is from 1 to 6 and Y.sup..crclbar. is an anion, in an amount of from 0.01 to 3.5% by weight, based on dry paper stock.