Patent · US Expired

Process for producing polyethylenes having a broad molecular weight distribution, and a catalyst system used thereby

US6242543A · kind A · utility

16Cited by

13References

12Claims

0Family size

Assignee

Borealis A/S · DK

Inventors

Arild Follestad · Stathelle, NO
Richard Blom · Oslo, NO
Ivar M. Dahl · Oslo, NO
Klaus Jens · Langesund, NO
Svein Eggen · Langangen, NO

Key dates

Filing date	May 3, 1999
Grant date	Jun 5, 2001
Priority date	—
Expiry date	May 3, 2019

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S526/943
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

A process for the polymerization of ethylene and optionally .alpha.-olefins to form ethylene homopolymer or copolymers having a broad molecular weight distribution, comprising polymerization of 100-80 wt. % of ethylene and 0-20 wt. % of comonomer in the presence of two independent, simultaneously present catalysts A and B, wherein catalyst A, deposited on an inorganic support, comprises chromium in a predominantly oxidant state of 2 and catalyst B comprises a bis-cyclopentadienyl chromium compound reacted with an inorganic support.

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