Asa sizing emulsions containing low and high molecular...

D - Textiles – Paper – 21 – H

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D21H 17/16 (2006.01) C08G 73/02 (2006.01) D21H 17/45 (2006.01) D21H 21/16 (2006.01) D21H 17/54 (2006.01) D21H 17/56 (2006.01)

Patent

CA 2259227

ASA sizing emulsions containing low and high molecular weight cationic polymers are described. An ASA sizing emulsion of the invention contains 25 to 99 percent by weight water, 0.003 to 60 percent by weight ASA, 0.003 to 50 percent by weight of a cationic polymer mixture, and 0 to 2 percent by weight of a surfactant. The cationic polymer mixture contains 75 to 99 percent by weight of an ionene polymer and 1 to 25 percent by weight of a high molecular weight polyethyleneimine polymer. In the sizing emulsion, the ASA has a particle size ranging from 0.5 to 3 microns. A method for sizing paper using such an emulsion is also described.

La présente invention concerne des émulsions de collage à base d'anhydrides d'acides alcényl-succiniques ou "ASA" (pour "Alkenyl Succinic Anhydrides") et contenant des polymères cationiques de faible poids moléculaire. L'émulsion de collage à base d'ASA de la présente invention est faite d'eau pour 25 à 99 % de sa masse, d'ASA pour 0,003 à 60 % de sa masse, d'un mélange cationique de polymères pour 0,003 à 50 % de sa masse, et d'un agent tensio-actif pour 0 à 2 % de sa masse. Le mélange cationique de polymères est fait d'un polymère d'ionènes pour 75 à 99 % de sa masse et d'un polymère de polyéthylèneimine de masse moléculaire élevée pour 1 à 25 % de sa masse. Le calibre moléculaire de l'ASA dans l'émulsion de collage est compris entre 0,5 à 3 mu m. L'invention concerne également utilisation d'une telle émulsion pour un procédé de collage du papier.

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