Patent · US Expired

Olefin polymerization process

US6995219B2 · kind B2 · utility

3Cited by

10References

17Claims

0Family size

Assignee

Borealis Technology Oy · FI

Inventors

Arild Follestad · Stathelle, NO
Richard Blom · Oslo, NO
Ivar M. Dahl · Oslo, NO
Erling Rytter · Trondheim, NO

Key dates

Filing date	May 10, 2002
Grant date	Feb 7, 2006
Priority date	—
Expiry date	May 10, 2022

Classification

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

Abstract

The invention relates to a process for the preparation of a multimodal A-olefin polymer comprising polymerizing in a polymerization stage at least one A-olefin in the presence of a multisite catalyst and an adjuvant so as to produce a polymer having a relatively lower molecular weight component and a relatively higher molecular weight component, said adjuvant being selected from the group consisting of phosphines, phosphites, acetylenes, dienes, thiophenes and aluminium alkyls and said adjuvant being capable of altering the ratio of the fraction of higher molecular weight component to the fraction of the lower molecular weight component by at least 10%.

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