Polymer and use thereof in the production of paper and board

Details Polymer and use thereof in the production of paper and board Polymer and use thereof in the production of paper and board

D - Textiles, Paper

21

H

D21H 17/29 (2006.01) D21H 17/24 (2006.01) D21H 17/37 (2006.01) D21H 21/20 (2006.01)

Patent

CA 2448113

As additive for the production of paper and board to improve the strength of a wet web a copolymer stabilized with a cationic polysaccharide is proposed in which copolymer an acrylamide of metacrylamide, vinylic craboxyl acid and optionally other vinylic monomers are used as monomers. The west strength of a web means the strength of a paper or board web during production at a dry solids content of 20-60%. The additive according to the invention improves, in addition to the wet strength of the web, also the surface resistance of the product. Compared to the additives of the prior art, a small relative ratio of the number of the side chains to the cationic groups is used, because a polysaccharide having a higher cationic character provides better stability.

L'invention concerne un copolymère stabilisé avec un polysaccharide cationique, qui est utilisé comme additif destiné à la production de papier ou de carton et pouvant améliorer la résistance d'une bande humide. Dans ledit copolymère, un acrylamide ou métacrylamide, un acide carboxylique vinylique et éventuellement d'autres monomères vinyliques sont utilisés comme monomères. La résistance à l'état humide d'une bande correspond à la résistance d'une bande de papier ou de carton pendant la production pour une teneur en matière sèche de 20 à 60 %. L'additif de l'invention améliore non seulement la résistance de la bande humide, mais également la résistance superficielle du produit. Par comparaison avec les additifs de la technique antérieure, un rapport relatif faible entre le nombre de chaînes latérales et les groupes cationiques est utilisé, puisqu'un polysaccharide ayant un caractère cationique supérieur offre une meilleure stabilité.

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