Use of hydrolyzed copolymers of N-vinylcarboxamides and monoethy

Details Use of hydrolyzed copolymers of N-vinylcarboxamides and monoethy Use of hydrolyzed copolymers of N-vinylcarboxamides and monoethy

1996-05-21

1997-05-20

Chin, Peter

Paper making and fiber liberation

Processes and products

Non-fiber additive

1621681, D21H 2110

Patent

active

056309074

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.

REFERENCES:
patent: 2721140 (1955-10-01), Weisgerber et al.
patent: 3597314 (1971-08-01), Laube et al.
patent: 4421602 (1983-12-01), Brunnmueller et al.
patent: 4880497 (1989-11-01), Pfohl et al.
patent: 5232553 (1993-08-01), Smigo et al.

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