Aqueous dispersions of water-soluble polymers of n-vinyl...

C - Chemistry – Metallurgy – 08 – F

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C08F 26/02 (2006.01) C02F 1/56 (2006.01) C08F 2/10 (2006.01) C08F 2/44 (2006.01) C08F 8/12 (2006.01) C08F 283/06 (2006.01) C08F 285/00 (2006.01) D21H 21/10 (2006.01) D21H 21/18 (2006.01)

Patent

CA 2465649

The invention relates to aqueous dispersions of water-soluble polymers of N- vinyl carboxylic acid amides that contain, as stabilizers, water-soluble, cross-linked graft polymers that can be obtained by the radically initiated polymerization of compounds with at least two ethylenically unsaturated double bonds in the presence of polyalkylene glycols. The invention also relates to a method for producing aqueous dispersions of water-soluble polymers of N-vinyl carboxylic acid amides by the radical polymerization of N-vinyl carboxylic acid amides in an aqueous medium and in the presence of said stabilizers, and to the use of the aqueous dispersions as dehydrators, flocculants, retention agents, wet-strength agents, dry-strength agents and as fixing agents in the production of paper.

L'invention concerne des dispersions aqueuses de polymérisat solubles dans l'eau d'amides d'acide N-vinyle carboxylique, qui contiennent comme stabilisants des polymères greffés réticulés solubles dans l'eau, obtenus par polymérisation initiée par voie radicalaire de composés comportant au moins deux liaisons doubles instaurées éthyléniquement, en présence de polyalkylène glycols. L'invention concerne également des procédés permettant de produire des dispersions aqueuses de polymérisats solubles dans l'eau d'amides d'acide N-vinyle carboxylique par polymérisation radicalaire d'amides d'acide N-vinyle carboxylique dans un milieu aqueux, en présence des stabilisants cités, ainsi que l'utilisation des dispersions aqueuses comme agents déshydratants, agents floculants et comme agents de rétention, comme agents de résistance à l'humidité et au sec, ainsi que comme agents de fixation dans la fabrication du papier.

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