| 摘要 |
Ethylene copolymers having a density of about 0.91 to 0.94 and a melt flow ratio of about >/=26 to </=40 are readily produced in a low pressure gas phase process at a productivity of >/=500,000 pounds of polymer per pound of Ti with a catalyst formed from selected organo aluminum compounds and a composition prepared by copulverizing magnesium dihalide with a complex obtained by contacting a titanium compound of the structure Ti(OR)aXb with an ether, ester, ketone or amine, wherein R is a C1 to C14 aliphatic or aromatic hydrocarbon radical, or COR' where R' is a C1 to C14 aliphatic or aromatic hydrocarbon radical, X is Cl, Br, I or mixtures thereof, a is 0 or 1, b is 2 to 4 inclusive and a+b=3 or 4.
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