Aqueous polymer dispersions, based on copolymers of vinyl...

C - Chemistry – Metallurgy – 08 – F

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C08F 251/00 (2006.01) C08F 251/02 (2006.01) C08L 51/02 (2006.01) C09D 151/02 (2006.01) D21H 21/16 (2006.01) D21H 17/35 (2006.01)

Patent

CA 2481797

The invention relates to aqueous polymer dispersions, obtained by the radically initiated copolymerisation of (a) between 0.1 and 99.9 wt. % styrene and/or methylstyrene, (b) between 0.1 and 99.9 wt. % 1,3-butadiene and/or isoprene and (c) between 0 and 40 wt. % of other ethylenically unsaturated copolymerisable monomers, whereby the sum of the monomers (a), (b) and (c) always equals 100, in the presence of between 10 and 40 wt. %, in relation to the monomers used, of at least one degraded starch with a molecular weight ranging between 500 and 40,000 Mn and water soluble redox catalysts. The invention also relates to a method for producing the polymer dispersions by the radical polymerisation of the monomers (a), (b) and optionally (c) in an aqueous medium in the presence of a degraded starch with a molecular weight ranging between 500 and 10,000 Mn and redox initiators and to the use of the aqueous polymer dispersions obtained by said method as pulp sizing and surface sizing agents for paper.

L'invention concerne des dispersions polymères aqueuses qui sont obtenues par copolymérisation initiée de manière radicalaire de : (a) 0,1 à 99,9 % en poids de styrène et/ou de métylstyrène ; (b) 0,1 à 99,9 % en poids de butadiène-1,3 et/ou d'isoprène et (c) 0 à 40 % poids d'autres monomères pouvant être copolymérisés éthyléniquement insaturés. La somme des monomères (a), (b), (c) correspond toujours à 100, et la copolymérisation s'effectue en présence de 10 à 40 % en poids, sur la base des monomères utilisés, d'au moins un amidon dégradé de poids moléculaire compris entre 500 et 40 000 Mn et de catalyseurs redox. L'invention concerne un procédé de production des dispersions polymères par polymérisation radicalaire des monomères (a), (b), et éventuellement (c) dans un milieu aqueux, en présence d'un amidon dégradé de poids moléculaire compris entre 500 et 10 000 Mn et des initiateurs redox. L'invention concerne également l'utilisation des dispersions polymères aqueuses ainsi obtenues en tant qu'agents de collage de surface et de masse pour papier.

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