| abstract |
A catalyst composition formed from selected organoaluminum compounds and a precursor composition of the formulan wherein ED is a selected electron donor compound R is a C 1 to C 14 , aliphatic or aromatic hydrocarbon radical, or COR' wherein R' is a C 1 to C 14 aliphatic or aromatic hydrocarbon radical, X is Cl, Br, 1, or mixtures thereof. Filler is an inert organic or inorganic compound, and, based on the total weight of such compositionn m is ≧ 0.5 to ≦ 56 in is 0 or 1 p is ≧ 6 to ≦ 116 q is ≧ 2 to ≦ 85 r has a value such that the percent filler is from about 10 to about 95 weight percent based on the total weight of the precursor composition.n A process for preparing such precursor composition by spray drying it from a slurry or solution in said electron donor compound, using atomization. n A process for using said catalyst to readily prepare ethylene polymers having a density of about ≧0.91 to ≦0.97, a melt flow ratio of ≧22 to ≦32 and a bulk density of about 18 to 32 lbs/ft 3 and controlled particle shape and size in a low pressure gas phase process at a productivity of ≧50,000 pounds of polymer per pound of Ti. |