Process for producing high melt flow poly-olefin polymers

Claim 1

A polymerization process for preparing a waxy block copolymer of propylene which consists essentially in polymerizing (said) propylene in liquid form employing as a catalyst a crystalline titanium trichloride cocrystallized with aluminum chloride and diethylaluminum monochloride as a cocatalyst, said polymerization being carried out at a rate of at least 300 pounds of polymer per pound of catalyst per hour based on the titanium trichloride and in the presence of a hydrogen partial pressure of about (300) 150 psia to about 1000 psia and at a reaction pressure of about 375 psia to about 5000 psia sufficient to maintain said propylene in liquid form during said polymerization to produce a homopolymer having an inherent viscosity of from 0.05 to 0.7 in decalin at 145°C and a melt flow of from 1000 to 5000 gms/10 min. as determined by ASTM D-1238-62T at 230°C using a load of 2160 grams, contacting said homopolymer which still contains active catalyst residues with at least one additional alpha-olefin monomer to form a subsequent polymer block attached to said homopolymer selected from the group of polyethylene (or) and a random ethylene-propylene copolymer and recovering from said polymerization a waxy block copolymer having a melt flow ranging from 40 to 400 gms/10 min. as determined by ASTM-D-1238-62T at 230°C using a load of 2160 grams.