Stephen M Broadbent

US Patent:

7977435, Jul 12, 2011

Filed:

Jul 12, 2006

Appl. No.:

11/485227

Inventors:

Chon-Yie Lin - Houston TX, US
Stephen Francis Broadbent - Houston TX, US

International Classification:

C08F 2/00
C08F 4/72
C08F 4/44
C08F 4/06
B01J 31/00

US Classification:

526 65, 526112, 5261246, 5261249, 5261253, 526126, 526128, 502116, 502158

Abstract:

Provided are a propylene polymer compositions comprising a propylene copolymer and a propylene homopolymer polymerized in the presence of the propylene copolymer. The propylene polymer compositions exhibit properties such as broad molecular weight distribution, low crystallinity, high solubles and superior crystallization kinetics and are useful in fast cycle-time processing methods such as injection molding, sheet extrusion, thermoforming, and oriented film fabrication. Also provided is a process for preparing the propylene polymer compositions in the presence of a catalyst and at least two electron donors using sequential or parallel polymerization reaction zones. Finally, articles made from the propylene polymer composition are provided, particularly articles requiring high stiffness, high heat deflection temperature, good fatigue resistance and low temperature impact resistance such as appliance parts.

Author:

Stephen Broadbent

ISBN #:

0953199509