Rheology modification of polymers prepared using metallocenes

US6777502B2 · kind B2 · utility

Assignee

• DOW GLOBAL TECHNOLOGIES LLC · US

Inventors

• Thoi H. Ho · Lake Jackson, US
• Wendy Hoenig · Lake Jackson, US
• Che-l Kao · Lake Jackson, US
• Michael E. Rowland · Lake Jackson, US
• Clark H. Cummins · Midland, US
• Michael J. Mullins · Lake Jackson, US
• H. Craig Silvis · Midland, US

Key dates

• Filing date: Jan 21, 2003
• Grant date: Aug 17, 2004
• Expiry date: Jan 21, 2023

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31917
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Coupled polymers are prepared by a process comprising heating an admixture containing (1) at least one polyolefin comprising ethylene and optionally at least one comonomer and (2) a coupling amount at least one poly(sulfonyl azide) to at least the decomposition temperature of the poly(sulfonyl azide) for a period sufficient for decomposition of at least 80 weight percent of the poly(sulfonyl azide) and sufficient to result in a coupled polymer; particularly where the polyolefin is the product of polymerization of ethylene and optionally at least one other alpha-olefin in the presence of a single site catalyst.