Paper size and paper sizing process

Details Paper size and paper sizing process Paper size and paper sizing process

D - Textiles, Paper

21

H

D21H 17/17 (2006.01) D21H 17/16 (2006.01) D21H 17/29 (2006.01) D21H 21/16 (2006.01)

Patent

CA 2248014

Disclosed are a paper size consisting essentially of a) alkyl ketene dimer and/or alkenyl succinic acid anhydride; b) degraded, liquid cationic starch having a cationic charge density of 0.5 to 3.5 meqv/g, a degree of substitution of more than 0.1 and a viscosity of less than 10000 cps (30 % by weight solution in water at 25 ~C); and c) water, and a process for making paper products in which this paper size is added to the pulp. The invention allows the production of AKD and/or ASA sizes on-site in paper plants using simple mixing equipment.

La présente invention concerne une colle de papier constituée principalement (a) de dimère d'alkyle kétène et/ou d'anhydride d'acide alcényle succinique, (b) d'amidon cationique liquide dégradé, dont la charge cationique présente une densité de 0,5 à 3,5 meqv/g, dont le degré de substitution est supérieur à 0,1, et dont la viscosité est inférieure à 10.000 cps (à raison de 30 % de la masse en solution aqueuse à 25 ·C), et (c) d'eau. L'invention concerne également un procédé de fabrication de papiers dans la pâte desquels on a ajouté une telle colle à papier. L'invention permet enfin la production sur site de colles de type AKD (dimère d'alkyle kétène) ou de type ASA (anhydride d'acide alcényle succinique) dans les usines à papier en n'utilisant que de simples équipements mélangeurs.

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