POLYMERIZATION CATALYST, PROCESS FOR PREPARING AND USE FOR ETHYLENE HOMOPOLYMERIZATION

摘要

A catalyst formed from selected organo aluminum compounds and s precursor composition of the formula MgmTil(OR)nXp¢ED)q wherein ED is a selected electron donor compound m is ?0.5 to ? 56 n is 0 or 1 p is ?6 to ? 116 q is ?2 to ? 85 R is a C1 to C14, aliphatic or aromatic hydrocarbon radical, or COR' wherein R' is C1 to C14 aliphatic or aromatic hydrocarbon radical, and X is selected from the group consisting of Cl, Br, I, or mixtures thereof, which catalyst is in particulate form and diluted with an inert carrier material; A process for preparing such catalyst; A process for using said catalyst to readily prepare ethylene hompolymer having a density of about ?0.958 to ? 0.972 and a melt flow ratio of ?22 to ?32 in a low pressure gas phase process at a productivity of ?50,000 pounds of polymer per pound of Tl. Novel polymers and molded articles sre prepared.