Ethylene homopolymers or copolymers having good machine direction (MD) elmendorf tear strength

US7572875B2 · kind B2 · utility

Assignee

• Chevron Phillips Chemical Company LP · US

Inventors

• Michael D. Jensen · Bartlesville, US
• Joel L. Martin · Bartlesville, US
• Max P. McDaniel · Bartlesville, US
• Qing Yang · Bartlesville, US
• Matthew G. Thorn · Lebanon, US
• Elizabeth A. Benham · Bartlesville, US
• Ted H. Cymbaluk · Bartlesville, US
• Ashish M. Sukhadia · Bartlesville, US
• Rajendra K. Krishnaswamy · Lexington, US
• Mark E. Kertok · Bartlesville, US

Key dates

• Filing date: Jun 5, 2006
• Grant date: Aug 11, 2009
• Expiry date: Oct 26, 2026

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S526/943
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

This invention relates to catalyst compositions comprising a first metallocene compound, a second metallocene compound, at least one chemically-treated solid oxide, and at least one organoaluminum compound. This invention also relates to methods to prepare and use the catalyst compositions and new polyolefins. The compositions and methods disclosed herein provide ethylene polymers and copolymers with lower MI, increased melt strength, and good MD tear properties.