Manufacture of olefin polymers

Claim 1

IN A PROCESS WHEREIN PROPYLENE IS POLYMERIZED BY CONTACTING PROPYLENE DISSOLVED IN AN INERT LIQUID HYDROCARBON MEDIUM, UNDER POLYMERIZATION CONDITIONS, WITH A CATLYST COMPOSITION CONSISTING ESSENTIALLY OF A METAL HALIDE AND A METALLO-ORGANIC ACTIVATOR THEREFOR SELECTED FROM THE GROUP CONSISTING OF ALKALI METAL HYRIDIED, ALKALI METAL ALUMINUM HYDRIDES, ALKALI METAL BOROHYDRIES, METAL ALKYLS WHEREIN SAID METAL IS SELECTED FROM THE GROUP CONSISTING OF ALUMINUM, ZINC, BERYLLIUM, CHROMIUM, MAGNESIUM, AND LEAD, HALIDES OF SAID METAL ALKYLS, AND ALKALI METAL ALKYLS, AND WHEREIN SOLID POLYPROPLYLENE IS THEREAFTER RECOVERED FROM THE REACTION MIXTURE, THE IMPROVEMENT WHICH COMPRISES USING AS SAID METAL HALIDE COMPONENT OF SAID CATALYST COMPOSITION A MATERIAL SELECTED FROM THE GROUP CONSISTING OF (A) SOLID PARTICLES OF A CHLORIDE OF TITANIUM FIRMLY EMBEDDED IN A SOLID CARRIER HAVING A MELTING POINT BELOW 440*C. SELECTED FROM THE GROUP CONSISTING OF SODIUM ALUMINUM CHLORIDE, THALLIUM OXIDE, FERRIC CHLORIDE, GALLIUM CHLORIDE, ELEMENTAL SULFUR, AND A METAL ALLOY, WHEREIN SAID TITANIUM HAS A VALENCE OF 2 TO 3 AND (B) SOLID PARTICLES OF A CHLORIDE OF ZIRCONIUM FIRMLY EMBEDDED IN A SOLID CARRIER HAVING A MELTING POINT BELOW 350*C. SELECTED FROM THE GROUP CONSISTING OF SODIUM ALUMINUM CHLORIDE, THALLIUM OXIDE, FERRIC CHLORIDE, GALLIUM CHLORIDE, ELEMENTAL SULFUR, AND A METAL ALLOY, WHEREIN SAID ZIRCONIUM HAS A VALENCE OF 2 TO 3 AND A PORTION OF THE SURFACES OF SAID SOLID PARTICLES ARE EXPOSED TO THE ENVIRONMENT SURROUNDING SAID COMPOSITION.