Gel reduction in high cis-1,4 polybutadiene production process

Details Gel reduction in high cis-1,4 polybutadiene production process Gel reduction in high cis-1,4 polybutadiene production process

C - Chemistry, Metallurgy

08

F

C08F 136/06 (2006.01) C08F 2/14 (2006.01) C08F 4/70 (2006.01) C08F 36/06 (2006.01)

Patent

CA 2246608

An essentially linear cis-1,4 polybutadiene having a very low level of gel content is prepared by a process comprising polymerizing 1,3-butadiene in the presence of a cobalt salt-organo aluminum halide-water catalyst system. The polymerization is carried out in the presence as polymerization diluent of a mixture of C5 - C6 cyclo alkane and butene-1, a cobalt salt of an organic acid having 6 to 12 carbon atoms in the organic acid, an organo aluminum halide selected from (i) a mixture of (a) an alkyl halide selected from diethyl aluminum chloride and ethyl aluminum sesqui chloride and (b) an organo aluminum or formula R3 A1 wherein R is an alkyl group having 8 to 12 carbon atoms and (ii) an alkyl group having 8 to 12 carbon atoms, a polymerization modifier selected from 1,2-butadiene and 1,3-cyclo octadiene, and water. The water has been mixed with at least a portion of the polymerization diluent such that the water is present in the polymerization diluent as particles having a diameter of equal to or less than about 1 micron.

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