| 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> |
