| abstract |
A catalyst formed from selected organc aluminum compounds and a precursor composition of the formula MgmTi1(OR)nXp[ED]q wherein ED is a selected electron donor compound m is >/=0.5 to </=56 n is 0, 1 or 2 p is >/=2 to </=116 q is >/=2 to </=85 R is a C1 to C14 aliphatic or aromatic hydrocarbon radical, or COR' wherein R' is a Chd 1 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 impregnated in a porous inert carrier material. A process for preparing such catalyst. A process for using said catalyst to readily prepared ethylene copolymers having a density of about >/=0.91 to </=0.94 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 Ti. Novel polymers and molded articles are prepared. |