| 摘要 |
A catalyst composition formed from selected organoaluminum compounds and a precursor composition of the formula MgmTil(OR)nXp[ED]q[Filler]r wherein ED is a selected electron donor compound R is a C1 to C14, aliphatic or aromatic hydrocarbon radical, or COR' wherein R' is a C1 to C14 aliphatic or aromatic hydrocarbon radical, X is Cl, Br, I, or mixtures thereof, Filler is an inert organic or inorganic compound, and, based on the total weight of such composition m is >/=0.5 to </=56 n 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. A process for preparing such precursor composition by spray drying it from a slurry or solution in said electron donor compound, using atomization. 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/ft3 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.
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