Bp Chemicals Limited

The Dow Chemical Company

Dow Global Technolgoies LLC

Kevin P Peil

David R Wilson

James C Stevens

Teresa Plumley Karjala

David D Devore

Francis J Timmers

Richard E Campbell, Jr

Deepak R Parikh

Paul C Vosejpka

Brian W Kolthammer

Kevin A Frazier

Lee Spencer

Carl N Iverson

Harold W Boone

Bruce A Story

Robert D Swindoll

Brian W S Kolthammer

Ian M Munro

Philip Howard

William R Van Volkenburgh

Christopher James Frye

Larry Duane Cady

Peter J Maddox

S Roy Partington

Peter S Williams

J Mark Winter

Joseph N Iii Coalter

A gas phase fluidized bed process is described for producing ethylene polymers having improved processability and an MWD of less than about 2.9. Multiple reactors in series or parallel may be used to produce in-situ blended polymers. Each reactor can separately have a constrained geometry catalyst or a conventional Ziegler-Natta catalyst as needed for obtaining in-situ blended polymer with the desired properties as long as there is a constrained geometry catalyst in at least one reactor. Olefin polymers can be produced according to this invention which have low susceptibility to melt fracture, even under high shear stress conditions.

Gas phase polymerization of olefins

This invention relates to a supported metallocene catalyst system for the high yield synthesis of polyolefins, to methods of preparation of the catalyst system, to polymerization processes which use the catalyst system and to polyolefin polymers produced by the polymerization processes.

Catalyst system for high yield synthesis of polyolefins

The invention relates to a polyolefin copolymer composition produced with a catalyst having a metallocene, complex in a single reactor for the polymer of an &agr;-olefin monomer with one or more olefin comonomers, and a molecule weight maximum which occurs in that 50 percent by weight of the composition which has the highest weight percent comonomer content. Preferably, the composition has a comonomer partitioning fact C which is equal to or greater than 1.10 or molecule weight partitioning fact M which is equal to or greater than 1.15. Preferred composition also have at least 0.01 long chain branches per 1000 carbon atoms along the polymer backbone. These compositions with reverse molecular engineering have. superior properties and are easily processable due to the simultaneous presence of the association of high molecular weight with high comonomer content and of long chain branching.

Polyolefin composition with molecular weight maximum occurring in that part of the composition that has the highest comonomer content

Olefin polymerization process

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Auburn, MI, United States of America

Kevin P Peil