Preparation of polyolefins

Claim 1

PROCESS FOR THE PREPARATION OF SOLID POLYMERS OF NORMALLY GASEOUS OLEFINS WHICH COMPRISES CONTACTING, UNDER POLYMERIZING CONDITIONS, A NORMALLY GASEOUS OLEFIN WITH SURFACES OF SOLID PARTICLES OF A CATALYST CONSISTING ESSENTIALLY OF (A) A HALIDE OF A METAL SELECTED FROM THE GROUP CONSISTING OF TITANIUM, ZIRCONIUM, HAFNIUM, VANADIUM, NIOBIUM, CHROMIUM, MOLYBDENUM, AND TUNGSTEN IN COMBINATION WITH (B) A METALLIC REDUCTING AGENT THEREOF WHEREIN THE METAL OF SAID METAL HALIDE IS PRESENT IN A VALENCE STATE OTHER THAN ITS HIGHEST VALENCE STATE, SAID CATALYST PARTICLES BEING POSITIONED IN A MULTIPLICITY OF APERTURES IN A TUBULAR CONDUIT, WHEREBY FLUID COMMUNICATION THROUGH SAID APERTURES IS BLOCKED, SAID CONTACTING OCCURRING ON ONLY ONE SIDE OF SAID TUBULAR CONDUIT, WHEREOF POLYMER FORMATION OCCURS ON THE CONTACT SURFACES OF THE SOLID CATALYST PARTICLES, AND SUBSEQUENTLY CONTACTING SURFACES OF THE SOLID CATALYST PARTICLES NOT EXPOSED TO POLYMER FORMATION WITH A SOLVENT FOR THE CATALYST PARTICLES, THEREBY DISSOLVING SAID CATALYST PARTICLES WITHOUT DISSOLVING THE SOLID OLEFIN POLYMER.