Preparation of rubbery polymers of butadiene

Claim 1

A PROCESS FOR PREPARING A RUBBERY HIGH VINYL POLYBUTADIENE WHICH COMPRISES CONTACTING 1,3-BUTADIENE UNDER POLYMERIZATION CONDITIONS WITH A CATALYST FORMED BY MIXING (1) MOLYBDENUM PENTACHLORIDE AND (2) A COMPOUND SELECTED FROM THE GROUP CONSISTING OF (A) COMPOUNDS HAVING THE FORMULA RNM, WHEREIN R IS SELECTED FROM THE GROUP CONSISTING OF ALKYL, ARYL, CYCLOALKYL, ARALKYL AND ALKARYL RADICALS CONTAINING 1 TO 10 CARBON ATOMS, M IS A METAL SELECTED FROM THE GROUP CONSISTING OF FALLIUM, LEAD, ZINC, MERCURY AND INDIUM, AND N IS EQUAL TO THE VALENCE OF THE METAL M, AND (B) COMPOUNDS HAVING THE FORMULA M''M"H4, WHEREIN M'' IS AN ALKALI METAL, AND M" IS SELECTED FROM THE GROUP CONSISTING OF ALUMINUM AND BORON, SAID M''M"H4 COMPOUND BEING IN SOLUTION IN A COMPOUND SELECTED FROM THE GROUP CONSISTING OF ETHERS AND AMINES, SAID CONTACTING OCCURRING IN A DILUENT SELECTED FROM THE GROUP CONSISTING OF AN AROMATIC HYDROCARBON AND A CYCLOALIPHATIC HYDROCARBON, A PROMOTER SELECTED FROM THE GROUP CONSISTING OF ETHERS, AMINES AND AMIDES HAVING BEEN ADDED TO SAID CYCLOALIPHATIC HYDROCARBON.