| 简介 |
PROBLEM TO BE SOLVED : To provide a catalytic system to be used for production of a diene elastomer comprising polyisoprene and polybutadiene by polymerization, a method for producing the catalytic system, and a process for producing the diene elastomer comprising polyisoprene with a high cis-1, 4 chain rate and polybutadiene using the catalytic system.
SOLUTION : The invention provides a catalytic system useful for production of the diene elastomer comprising polyisoprene and polybutadiene by polymerization. The catalytic system is at least based on following ingredients : a conjugate diene monomer, a salt of one or more rare earth metals with an organic phosphoric acid, an alkylating agent made of alkylaluminium of formula AlR3 or HAlR2, and a halogen donor consisting of an alkylaluminium halide, in which the salt is suspended in at least one inert and saturated aliphatic or alicyclic hydrocarbon solvent, and the mol ratio, "alkylating agent/rare earth salt", has a value ranging between 1 and 5.
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