Use of hydrolysed copolymers of n-vinyl carboxylic acid...

Details Use of hydrolysed copolymers of n-vinyl carboxylic acid... Use of hydrolysed copolymers of n-vinyl carboxylic acid...

D - Textiles, Paper

21

H

D21H 17/45 (2006.01) C08F 8/12 (2006.01) D21H 17/34 (2006.01) D21H 17/37 (2006.01) D21H 17/43 (2006.01) D21H 21/10 (2006.01) D21H 21/18 (2006.01)

Patent

CA 2145286

Use of copolymers which are obtainable 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 com- pounds and, if required, d) up to 2 mol% of crosslinking agents and subsequent partial or complete elimination of the formyl 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.

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