Catalyst composition comprising shuttling agent for higher olefin multi-block copolymer formation

US7951882B2 · kind B2 · utility

Assignee

• DOW GLOBAL TECHNOLOGIES LLC · US

Inventors

• Daniel J. Arriola · Midland, US
• Edmund M. Carnahan · Fresno, US
• David D. Devore · Midland, US
• Phillip D. Hustad · Manvel, US
• Roger L. Kuhlman · Lake Jackson, US
• Timothy T. Wenzel · Charleston, US

Key dates

• Filing date: Mar 17, 2005
• Grant date: May 31, 2011
• Expiry date: Sep 19, 2028

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T442/60
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Copolymers, especially multi-block copolymer containing therein two or more segments or blocks differing in chemical or physical properties, are prepared by polymerizing propylene, 4-methyl-1-pentene, or other C4-8α-olefin and one or more copolymerizable comonomers, especially ethylene in the presence of a composition comprising the admixture or reaction product resulting from combining: (A) a first metal complex olefin polymerization catalyst, (B) a second metal complex olefin polymerization catalyst capable of preparing polymers differing in chemical or physical properties from the polymer prepared by catalyst (A) under equivalent polymerization conditions, and (C) a chain shuttling agent.