| 摘要 |
<p>A cataylst formed from selected organo 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 min wherein R min is a 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 impregnated in a porous inert carrier material. <??>A process for preparing such catalyst. <??>A process for using said catalyst to readily prepare 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. <??>This application is a Continuation-In-Part of copending application Serial No. 892,322 filed March 31, 1978. </p> |
