Process for producing polybutadiene rubber with enhanced...

Details Process for producing polybutadiene rubber with enhanced... Process for producing polybutadiene rubber with enhanced...

C - Chemistry, Metallurgy

08

F

400/6460

C08F 295/00 (2006.01) C08F 136/06 (2006.01)

Patent

CA 1150884

- 21 - PROCESS FOR PRODUCING POLYBUTADIENE RUBBER WITH ENHANCED MECHANICAL STRENGTH ABSTRACT OF THE DISCLOSURE A polybutadiene rubber having an enhanced mechanical strength is produced by a process comprising two successive steps of: (A) cis-1,4-polymerizing 1,3-butadiene in a poly- merization medium in the presence of a catalyst comprising a cobalt compound and a dialkyl aluminium halide of the formula (I): A?R2X, wherein R = C2-8 alkyl and X = halogen, and; (B) subjecting a mixture of the resultant cis-1,4- -polybutadiene and the non-reacted 1,3-butadiene in the polymerization medium to a 1,2-polymerization in the presence of a catalyst comprising a cobalt compound, a dialkyl aluminium halide of the formula (I), carbon disulfide and an electron donative organic compound.

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