Exxonmobil Chemical Patents Inc.

Ronald N Cooke

Blair Alfred Graham

David John Lohse

Michael D Awe

George Alan Vaughan

Paul M German, Jr

Arnold Lustiger

Steven A Best

Edward F Smith

Bernard Louis Bossaert

Calvin K Schram

Barry C Trudell

James R Sollen

Carlos A Mota

Timothy K Bean

Ahmed H Ali

Sateesh K Rajput

Mike Awe

Michael Awe

George A Vaughan

A process for reducing the loss of catalyst activity of a Ziegler-Natta catalyst is provided. The process includes preparing a Ziegler-Natta (ZN) catalyst by contacting the ZN catalyst with at least one aluminum alkyl compound to produce a reduced ZN catalyst and storing and/or transporting the reduced ZN catalyst for at least 20 days at a temperature of 25&#xb0; C. or less. The reduced ZN catalyst may be used for polymerizing polyolefin polymers.

Processes for reducing the loss of catalyst activity of a Ziegler-Natta catalyst

Rotomolded compositions and articles made therefrom using metallocene-catalyzed polyolefin polymers and at least one adhesion promoter are provided.

Rotomolded compositions, articles, and processes for making the same

Provided are blends of linear low density polyethylene copolymers with very low density, low density, medium density, high density, and differentiated polyethylenes and other polymers. The invention also includes articles produced from the linear low density polyethylene and polyethylene blends described herein.

Linear polymers, polymer blends, and articles made therefrom

Polyethylene blend compositions suitable for rotomolding, rotomolded articles, and processes for rotomolding articles are provided. The polyethylene compositions include a first polyethylene having a melt index of 0.4 to 3.0 g/10 min and a density of from 0.910 to 0.930 g/cm; and a second polyethylene having a melt index of 10 to 30 g/10 min and a density of 0.945 to 0.975 g/cm. The composition has a density of from 0.930 to 0.955 g/cmand a melt index of 1.5 to 12 g/10 min, and the first and second polyethylenes differ in density by from 0.030 to 0.048 g/cm. These compositions exhibit improved physical properties, such as Environmental Stress Crack Resistance and Izod Impact Strength. Articles produced from the compositions may also exhibit improved impact resistance properties, enhanced ductile break properties, and improved deflection resistance, which represents a combination of creep and fatigue resistance.

Polyethylene compositions for rotational molding

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Ronald N Cooke