Production of ultra high melt flow polypropylene resins
AssigneeFina Technology, Inc.
InventorsKenneth Paul Blackmon, Luis Paulo Barthel-Rosa, Shabbir Ahmedbhai Malbari, David J. Rauscher, Michel M. Daumerie
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Abstract
A method of preparing ultra high melt flow polypropylene having reduced xylene solubles is provided. The method utilizes a diether internal donor-containing Ziegler-Natta catalyst system to polymerize propylene. The polypropylene produced is characterized by having a melt flow of at least about 300 g/10 min and a xylene solubles of not more than about 3.5% and no peroxide residue. The catalyst system may also include an internal phthalate donor. The method of the invention allows the amount of external donors to be reduced, or even eliminated, without significant increases in xylene solubles.
Claims5
A polypropylene comprising a propylene polymer having no peroxide residue and having a melt flow of from about 300 g/10 min. to about 400 g/10 min. and a xylene solubles of not more than about 3.5%, and wherein the propylene content of the polymer is from 99.5 to 100% by weight of polymer.
Dependencies are inferred from the claim text.