Phillips Petroleum Company

Rickey D Badley

Max P McDaniel

Elizabeth Ann Benham

Kent W Rollmann

Bruce E Kreischer

Joseph S Shveima

Catalyst compositions are provided that comprise (a) discrete silica particles; (b) chromium; and (c) a support comprising silica. These composition are useful in polymerizing ethylene or copolymerizing ethylene with a comonomer and provide better control over the molecular weight and the molecular weight distribution of a resulting polymer.

Catalyst compositions and catalytic processes

A process is provided comprising copolymerizing, under copolymerizing conditions, ethylene with one or more alpha-olefins, using a catalyst system, where said catalyst system has been sized, to produce a lower-density-copolymer, where said lower-density-copolymer has a density lower than a similar copolymer produced by copolymerizing, under said copolymerizing conditions, ethylene with said one or more alpha-olefins, using said catalyst system, where said catalyst system has not been sized, where said catalyst system that has been sized has had substantially all particles removed that produce, under said copolymerizing conditions, a higher-density-copolymer, where said higher-density-copolymer has a density higher than said similar copolymer.

Ethylene copolymerization process

This invention provides a chromium catalyst system that comprises [a] a support that comprises silica, wherein said support has a surface area to pore volume relationship as follows

Chromium catalyst compositions and ethylene polymerization processes

Chromium catalyst compositions are provided. Theses chromium catalyst compositions can be used to polymerized olefins. The resulting polymerization product can have improved properties.

Chromium catalyst compositions

This invention provides a chromium catalyst system that comprises

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Dewey, OK, United States of America

Rickey D Badley