Patent · US Active

Process for the preparation of multimodal polyethylene resins

US7829641B2 · kind B2 · utility

10Cited by

11References

9Claims

0Family size

Assignee

Equistar Chemicals, LP · US

Inventors

Bradley P. Etherton · Houston, US
Stephen M. Imfeld · Mason, US
Philip J. Garrison · Houston, US

Key dates

Filing date	Jul 16, 2008
Grant date	Nov 9, 2010
Priority date	—
Expiry date	Jul 22, 2028

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02P20/52
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

A two-stage cascade polymerization process for the production of multimodal polyethylene film resins with improved bubble stability is provided. The process comprises polymerizing ethylene or a mixture of ethylene and a C4-8 α-olefin in two reactors arranged in series using a mixed single-site catalyst comprised of a bridged and a non-bridged indenoindolyl transition metal complex to form a multimodal polyethylene resin comprised of a lower molecular weight, higher density component and a higher molecular weight, lower density component.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.