Catalytic system and method for preparing elastomers using same

C - Chemistry – Metallurgy – 08 – F

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C08F 136/08 (2006.01) C08F 4/54 (2006.01) C08F 136/04 (2006.01)

Patent

CA 2427984

The invention concerns a catalytic system used for preparing by polymerisation diene elastomers comprising polyisoprenes and polybutadienes, a method for preparing said catalytic system and a preparation method, using said catalytic system, of said diene elastomers comprising polyisoprenes with high cis-1,4 chaining rate and polybutadienes. The inventive catalytic system is at least based on: a conjugate diene monomer, a salt of one or several rare earth metals of an organic phosphoric acid, an alkylaluminium alkylating agent of formula AlR¿3? or HAIR¿2?, and a halogen donor consisting of an alkylaluminium halide, and such that the salt is suspended in at least an inert and saturated hydrocarbon solvent of the aliphatic or alicyclic type, the mol ratio (alkylating agent/rare earth salt) having a value ranging between 1 and 5.

La présente invention concerne un système catalytique utilisable pour préparer par polymérisation des élastomères diéniques comprenant des polyisoprènes et des polybutadiènes, un procédé de préparation dudit système catalytique et un procédé de préparation, au moyen de ce système catalytique, de tels élastomères diéniques comprenant des polyisoprènes à taux élevés d'enchaînements cis-1,4 et des polybutadiènes. Un système catalytique selon l'invention est à base d'au moins: un monomère diène conjugué, un sel d'un ou plusieurs métaux de terre rare d'un acide phosphorique organique, un agent d'alkylation constitué d'un alkylaluminium de formule AIR3 ou HAIR2, et un donneur d'halogène constitué d'un halogénure d'alkylaluminium, et il est tel que ledit sel est en suspension dans au moins un solvant hydrocarboné inerte et saturé de type aliphatique ou alicyclique, le rapport molaire (agent d'alkylation / sel de terre rare) présentant une valeur allant de 1 à 5.

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