| http://www.w3.org/ns/prov#value | - A process for polymerizing a monomeric material comprising a conjugated diene containing from 4 to 8, inclusive, carbon atoms per molecule which comprises contacting said monomeric material with a catalyst formed by mixing (l) a compound having the formula RAlX wherein R is an alkyl radical and X is a halogen, and (2) the reaction product obtained by reacting a cobaltous compound with an amine-typ
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