Process for preparing a high density polyethylene of low n-paraf

Details Process for preparing a high density polyethylene of low n-paraf Process for preparing a high density polyethylene of low n-paraf

1993-09-27

1994-09-27

Smith, Edward J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526 97, 526124, 526129, 5263485, 526352, 526903, 526904, C08F 4636, C08F 468, C08F 1002

Patent

active

053508181

ABSTRACT:
A process for producing a high density polyethylene resin which has a negligible n-paraffin content while having a melt index ratio of at least 75 by polymerizing ethylene with a minor amount of a diene in the presence of a supported organophosphorous modified vanadium-containing catalyst component. Vanadium-containing catalyst components useful with an organoaluminum cocatalyst for polymerizing ethylene with an aliphatic diene to produce high density resins having not only a low C.sub.10 -C.sub.32 n-paraffin content (characteristic of high molecular weight polymers having a narrow molecular weight distribution), but, surprisingly, also a melt index ratio desirable for melt blowing applications more characteristic of vanadium catalyzed polymers (which have relatively high n-paraffin content), are obtained by contacting an inert support material with an organoaluminum compound, an optional halogenating agent, a vanadium compound, and an organophosphorous compound. A diene containing at least four carbon atoms is used to copolymerize with ethylene.

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