Process for preparing crystalline high 1,4 trans polybutadiene

Details Process for preparing crystalline high 1,4 trans polybutadiene Process for preparing crystalline high 1,4 trans polybutadiene

C - Chemistry, Metallurgy

08

F

C08F 4/80 (2006.01) C08F 4/70 (2006.01) C08F 36/06 (2006.01) C08F 136/06 (2006.01)

Patent

CA 2177937

Diene polymers having a high content of trans-1,4 addition and two distinct melting points in the ranges of 30°C to 50°C and 70°C to 130°C are prepared by polymerizing a 1,3- diene monomer in a hydrocarbon solvent in the presence of a catalyst composition comprising (a) a carboxylated nickel oxy borate compound; (b) an organoaluminum compound; (c) a triaryloxy phosphorus compound and (d) a carboxylic acid preferably a fluorinated carboxylic acid. The resultant polymers are useful as additives to tire rubbers to improve processability by reducing compound Mooney viscosity and reducing the shrinkage of various compound stocks.

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