Dual catalyst system for producing LLDPE copolymers with improved processability

US10358506B2 · kind B2 · utility

Assignee

• Chevron Phillips Chemical Company LP · US

Inventors

• Errun Ding · Bartlesville, US
• Chung Ching Tso · Bartlesville, US
• Randall S. Muninger · Canton, US
• Qing Yang · Bartlesville, US
• Youlu Yu · Bartlesville, US
• Yongwoo Inn · Bartlesville, US

Key dates

• Filing date: Oct 3, 2017
• Grant date: Jul 23, 2019
• Expiry date: Oct 3, 2037

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08L2207/068
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Disclosed herein are ethylene-based polymers generally characterized by a density from 0.89 to 0.93 g/cm3, a ratio of Mw/Mn from 3 to 6.5, a Mz from 200,000 to 650,000 g/mol, a CY-a parameter at 190° C. from 0.2 to 0.4, and a reverse short chain branching distribution. The ATREF profile of these polymers can have a high temperature peak from 92 to 102° C., and a low temperature peak from 18 to 36° C. less than that of the high temperature peak. These polymers can have comparable physical properties to that of a metallocene-catalyzed LLDPE, but with improved processability, shear thinning, and melt strength, and can be used in blown film and other end-use applications.