Fina Technology, Inc.

Theodore G Harris, Iii

Edwar Shoukri Shamshoum

B Raghava Reddy

Margarito Lopez

Sehyun Kim

Aiko Hanyu

Provided is polyolefin composition, the majority of which is highly isotactic polypropylene, comprising the property of heat of melting (&Dgr;H,) greater than or equal to about 89 J/g.

Compositions useful for tough, high crystallinity films

The invention provides a polymerization process with improved catalyst activity of a metallocene catalyst supported on silica treated with MAO, a process for supporting a metallocene compound on silica treated with MAO, a metallocene catalyst supported on silica treated with MAO within a certain temperature range and a process for making a metallocene catalyst supported on silica treated with MAO. The invention includes supporting the metallocene compound on a MAO-treated silica at a temperature of below 0&deg; C. The supported catalyst is activated with an aluminum alkyl. The catalyst may be prepolymerized in a tubular reactor prior to being introduced into the polymerization reaction zone.

Catalyst efficiency for supported metallocene catalyst

The invention provides a process for making a metallocene catalyst supported on silica treated with MAO. The invention includes supporting the metallocene compound on a MAO-treated silica at a temperature of below 0.degree. C. The supported catalyst is activated with an aluminum alkyl. The catalyst may be prepolymerized in a tubular reactor prior to being introduced into the polymerization reaction zone.

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Seabrook, TX, United States of America

Theodore G Harris, Iii