Rheology-modified polyolefins

US6114486A · kind A · utility

Assignee

• THE DOW CHEMICAL COMPANY · US

Inventors

• Michael E. Rowland · Lake Jackson, US
• Robert R. Turley · Lake Jackson, US
• James J. Hill · Angleton, US
• Lawrence T. Kale · Cochrane, US
• Kyle G. Kummer · Lake Jackson, US
• Shih-Yaw Lai · Sugar Land, US
• Pak-Wing S. Chum · Midland, US

Key dates

• Filing date: Feb 28, 1997
• Grant date: Sep 5, 2000
• Expiry date: Feb 28, 2017

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08J2323/04
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The subject invention is directed to a rheology-modified ethylene polymer having less than 0.5 weight percent gel, a composition distribution breadth index (CDBI) greater than 50 percent, and a molecular weight distribution (M.sub.w /M.sub.n) of less than 4.0, which is characterized as having improved rheological performance and/or melt strength attributes relative to the unmodified polymer. The subject invention is further directed to polymer blends which comprise the rheology-modified polymers, and to a process for preparing the rheology-modified polymers.