Braskem America, Inc.

Union Carbide Chemicals & Plastics Technology Corporation

Thomas Cuthbert

Peter Simon Dias

Debra R Wilson

Craig C Meverden

Li-Min Tau

Peter S Martin

Drew Davidock

Edward E Catalina

Rita Majewski

Jonathan D Kersey

Peter A Kilty

Craig Charles Meverden

Beth Kuettel

The present invention provides an in-reactor solution that avoids costly blending and the use of metallocene elastomers. The inventive Ziegler-Natta polypropylene composition also includes additional components that may improve properties relative to a metallocene catalyzed elastomers. The invention is a clear impact polypropylene composition that is made in-reactor with Ziegler-Natta catalyst, and is suitable for a wide range of processes. Unlike other clear impact copolymers, it does not rely on high-shear processes or compounding with elastomers. The invention uses conventional polypropylene reactor technology to produce these compositions.

Polypropylene impact copolymers with low haze

Propylene impact copolymers (ICPs) are provided which comprise: (a) a matrix phase which comprises from 60 to 95 weight % of a polypropylene polymer containing from 0 to 6 mole % of units derived from one or more alpha-olefins other than propylene, and (b) a dispersed phase which comprises from 5 to 40 weight % of a copolymer derived from a first comonomer which can be either propylene or ethylene together with a second alpha-olefin comonomer. The ICP is further characterized by having a beta/alpha ratio less than or equal to 1.1. The ICPs of the present invention are particularly well suited for applications requiring clear, tough polymers such as thin walled injection molded articles for frozen food packaging applications.

Propylene impact copolymers having good optical properties

Olefin polymerization catalyst compositions and method of preparation

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Houston, TX, United States of America

Thomas Cuthbert