Process for production of vinyl-cis-polybutadiene rubber and...

C - Chemistry – Metallurgy – 08 – L

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C08L 9/00 (2006.01) C08L 53/00 (2006.01)

Patent

CA 2591711

A process for producing a vinyl-cis-polybutadiene rubber, including mixing (A) vinyl-cis-polybutadiene obtained by (1) a step of adding a cis-l,4-polymerization catalyst obtainable from an organoaluminum compound and a soluble cobalt compound to a mixture containing 1,3-butadiene and a hydrocarbon-based organic solvent as the major components and having an adjusted water content, thereby subjecting the 1,3-butadiene to cis-l,4-polymerization and subsequently, (2) a step of making a catalyst obtainable from a soluble cobalt compound, an organoaluminum compound represented by the general formula, AlR3 (wherein R represents an alkyl group having from 1 to 6 carbon atoms, a phenyl group, or a cycloalkyl group) , and carbon disulfide present in the resulting polymerization reaction mixture, thereby subjecting the 1,3-butadiene to 1,2-polymerization; and (B) cis-polybutadiene obtained by a step of adding the foregoing cis-l,4-polymerization catalyst, thereby subjecting the 1,3-butadiene to cis-1,4-polymerization and a rubber composition containing the resulting rubber.

L~invention concerne un procédé pour la fabrication de caoutchoucs de vinyl-cis-polybutadiène, caractérisé par le mélange de (A) un vinyl-cis-polybutadiène obtenu lors de l~étape (1) consistant à ajouter un catalyseur de polymérisation 1,4-cis préparé à partir d~un composé d~organoaluminium et d~un composé de cobalt soluble, à un mélange qui comprend du 1,3-butadiène et un solvant organique à base d~hydrocarbure et dont la concentration en eau est contrôlée, pour réaliser une polymérisation 1,4-cis du 1,3-butadiène et l~étape (2) consistant à incorporer le catalyseur préparé à partir du composé de cobalt soluble, un composé d~organoaluminium représenté par la formule générale : AlR3 (dans laquelle R est un alkyle de 1 à 6 atomes de carbone, un phényle ou un cycloalkyle) et un sulfure de carbone dans le mélange réactionnel résultant pour réaliser la polymérisation 1,2 du 1,3-butadiène, avec (B) un cis-polybutadiène obtenu lors de l~étape (1) ; et les compositions de caoutchouc contenant les caoutchoucs de vinyl-cis polybutadiène obtenus selon le procédé.

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