| http://www.w3.org/ns/prov#value | - A process for preparing a rubbery polybutadiene containing a high percentage of cis 1,4-addition which comprises contacting 1,3-butadiene with a catalyst formed by mixing (1) an organoaluminum compound having the formula RAlX wherein R is an alkyl radical and X is a halogen, and (2) the reaction product of a cobaltous compound with an amine-type compound selected from the group consisting of ammon
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