Organoaluminum-transition -metal ha-

Claim 1

IN THE POLYMERIZATION OF AN A-MONOLEFIN TO FORM SOLID POLYMER BY MEANS OF A CATALYST CONSISTING ESSENTIALLY OF AN ALKYL ALUMINUM HALIDE SELECTED FROM THE GROUP CONSISTING OF RAIX2 AND R3AL2X3, WHEREIN R IS SELECTED FROM THE GROUP CONSISTING OF ALKYL RADICALS CONTAINING FROM 1-12 CARBON ATOMS, PHENYL AND BENZYL, AND X IS A HALOGEN ATOM SELECTED FROM THE GROUP CONSISTING OF CHLORINE, BROMINE, AND IODINE, AND A HALIDE OF A TRANSITION METAL SELECTED FROM THE GROUP CONSISTING OF TITANIUM, VANADIUM, CHROMIUM, MOLYBDENUM, AND ZIRCONIUM, THE HALOGEN ATOM BEING SELECTED FROM THE GROUP CONSISTING OF BROMINE, CHLORINE, AND IODINE, THE IMPROVEMENT WHICH COMPRISES EFFECTING THE POLYMERIZATION IN THE PRESENCE OF AN ALKALI METAL FLUORIDE AS A THIRD COMPONENT FOR THE CATALYST, SAID CATALYST CONTAINING FROM 0.5 TO 6 MOLES OF ALKYL ALUMINUM HALIDE AND FROM 0.5 TO 12 MOLES OF ALKALI METAL FLUORIDE PER MOLE OF TRANSITION METAL HALIDE.