Resins that yield low haze films and the process for their production

US7199073B2 · kind B2 · utility

Assignee

• Chevron Phillips Chemical Company LP · US

Inventors

• Joel L. Martin · Bartlesville, US
• Elizabeth A. Benham · Bartlesville, US
• Mark E. Kertok · Bartlesville, US
• Michael D. Jensen · Bartlesville, US
• Max P. McDaniel · Bartlesville, US
• Gil R. Hawley · Canton, US
• Qing Yang · Bartlesville, US
• Matthew G. Thorn · Lebanon, US
• Ashish M. Sukhadia · Bartlesville, US

Key dates

• Filing date: Nov 10, 2004
• Grant date: Apr 3, 2007
• Expiry date: Apr 3, 2025

Classification

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

Abstract

Catalyst compositions comprising a first metallocene compound, a second metallocene compound, a third metallocene compound, a chemically-treated solid oxide, and an organoaluminum compound are provided. Methods for preparing and using the catalyst and polyolefins are also provided. The compositions and methods disclosed herein provide ethylene polymers having decreased haze while minimizing impact on other properties, such as dart impact.