Process for preparing an aqueous polymer dispersion

Details Process for preparing an aqueous polymer dispersion Process for preparing an aqueous polymer dispersion

C - Chemistry, Metallurgy

08

F

C08F 2/20 (2006.01) C08F 2/10 (2006.01) D21H 17/45 (2006.01) D21H 21/10 (2006.01)

Patent

CA 2485288

The present invention relates to a process for preparing an aqueous polymer dispersion which comprises polymerising one or more water-soluble monomers in an aqueous solution of salt in the presence of a dispersant polymer, wherein the dispersant polymer is a co-polymer of a monomer mixture (M) comprising at least one cationic monomer and at least one monomer which is tetrahydrofurfuryl acrylate, tetrahydrofurfuryl methacrylate, or a monomer of the general formula (I) wherein R1 is hydrogen or methyl, R2 is hydrogen or C1- C2 alkyl, R3 is hydrogen, C1-C4 alkyl, phenyl, or benzyl, n= 1 to 4, and x = 1 to 50, where, the monomer mixture (M) is being substantially free from monomers which are not soluble in water and/or the dispersant polymer is obtainable by polymerising the monomer mixture (M) in a reaction medium which is substantially free from organic solvents. The invention also relates to an aqueous polymer dispersion, use of the dispersion and a process for the production of paper.

L'invention porte sur un procédé de préparation d'une dispersion aqueuse de polymères consistant: à polymériser un ou plusieurs monomères hydrosolubles dans une solution aqueuse de sel en présence d'un polymère dispersant. Ce dernier est un copolymère d'un mélange de monomères (M) comprenant au moins un monomère cationique et au moins un monomère sélectionné parmi du tétrahydrofurfuryl acrylate, du tétrahydrofurfuryl méthacrylate ou un monomère de formule générale (I) dans laquelle: R¿1? est H ou méthyle, R¿2? est H ou C¿1?-C¿2? alkyle, R¿3? est H, C¿1?-C¿4? alkyle, phényle, ou benzyle, n = 1 à 4, et x = 1 à 50. Le mélange de monomères (M) est sensiblement exempt de monomères non hydrosolubles et/ou le polymère dispersant peut s'obtenir en polymérisant le mélange de monomères (M) dans un milieu réactif sensiblement exempt de solvants organiques. L'invention porte également sur une dispersion aqueuse de polymères, sur son utilisation, et sur un procédé de préparation de papier.

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