Polymerization process and catalyst therefor

Claim 1

A POLYMERIZATION PROCESS WHICH COMPRISES CONTACTING AN ETHYLENICALLY UNSATURATED HYDROCARBON OF FROM 2 TO 16 CARBON AROMS WITH A CATALYTIC AMOUNT OF A COMBINATION POLYMERIZATION CATALYST CONSISTING OF (1) A TRIALKYLALUMINUM REDUCING AGENT, (2) A CHLORIDE OF A GROUP IVB METAL, (3) A COMPOUND OF A GROUP VB METAL SELECTED FROM THE GROUP CONSISTING OF GROUP VB METAL OXYHALIDES AND GROUP VB METAL HALIDES, AND (4) A GROUP IVA METAL COMPOUND SELECTED FROM THE GROUP CONSISTING OF GROUP IVA METAL HALIDES, GROUP IVA METAL ALKYLS, GROUP IVA METAL ARYLS, GROUP IVA METAL ALKYL HALIDES AND GROUP IVA MIXED ARYL ALKYLS TO PRODUCE A NORMALLY SOLID POLYMER OF SAID HYDROCARBON, A SAID GROUP IVA METAL BEING FROM THE GROUP CONSISTING OF SILICON, GERMANIUM, TIN AND LEAD AND SAID COMBINATION CATALYST BEING CHARACTERIZED BY COMPRISING FROM ABOUT 9 TO ABOUT 98 MOLE PERCENT OF THE TRIALKYLALUMINUM REDUCING AGENT AND THE REMAINDER, IN A RATIO OF MOLE PERCENT, OF FROM ABOUT 1 TO ABOUT 90 OF EACH OF SAID GROUP IVB METAL CHLORIDE, GROUP VB COMPOUND AND GROUP IVA COMPOUND.