Method for producing aqueous styrene-butadiene polymer...

C - Chemistry – Metallurgy – 08 – F

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C08F 212/08 (2006.01) C08F 236/06 (2006.01)

Patent

CA 2461672

The invention relates to a method for producing an aqueous styrene-butadiene polymer dispersion by carrying out a radical aqueous emulsion polymerization of a monomer mixture M containing: 40 to 80 wt. % of styrene depicted as Monomer M1; 20 to 60 wt. % of butadiene depicted as monomer M2, and; 0 to 40 wt. %, with regard to 100 wt. % of the monomers, of ethylenically unsaturated comonomers M3 that differ from styrene and butadiene. The polymerization is carried out according to a monomer feeding method in the presence of 0.05 to 0.5 wt. %, with regard to 100 wt. % of the monomers, of at least one hydrocarbon KW selected among compounds having 6 to 20 C atoms that form a pentadienyl radical or a 1-phenylallyl radical when a hydrogen atom is abstracted, and the .alpha.-methylstyrene dimer. The inventive method is characterized in that the monomers to be polymerized are introduced within three hours of the polymerization reaction.

La présente invention concerne un procédé permettant la préparation d'une dispersion aqueuse de polymère styrène-butadiène par polymérisation radicalaire en émulsion aqueuse d'un mélange monomérique (M) contenant de 40 à 80 % en poids de styrène en tant que monomère (M1), de 20 à 60 % en poids de butadiène en tant que monomère (M2) et de 0 à 40 % en poids de comonomères éthyléniquement insaturés (M3) différents du styrène et du butadiène, les pourcentages se rapportant aux 100 % en poids du mélange monomérique, après un processus d'apport de monomères en la présence de 0,05 à 0,5 % en poids, se rapportant aux 100 % en poids du mélange monomérique, d'au moins un hydrocarbure (KW) choisi parmi les composés à 6 à 20 atomes de C qui forment un radical pendadiényle ou 1-phénylallyle après suppression d'un atome d'hydrogène, et le dimère .alpha.-méthylstyrène. Le procédé se caractérise en ce que les monomères à polymériser sont ajoutés à la réaction de polymérisation en l'espace de 3 heures.

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