Patent · US Active

Process to reduce polyolefins with extra low impurity content

US8217125B2 · kind B2 · utility

0Cited by

5References

16Claims

0Family size

Assignee

Borealis Technology Oy · FI

Inventors

Amir Karbasi · Espoo, FI
Esa Korhonen · Porvoo, FI
Michiel Bergstra · Berchem, BE

Key dates

Filing date	May 22, 2007
Grant date	Jul 10, 2012
Priority date	—
Expiry date	Jun 12, 2028

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08F110/06
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

A process for producing polyolefins, which includes polymerizing at least one olefin monomer, separating at least a part of the reaction mixture, dividing the separated reaction mixture into a polymer-lean fraction and a polymer-rich fraction, and subjecting at least a part of the polymer-lean fraction to a purification step prior to recycling back to the polymerization of at least one olefin monomer. The obtained polyolefins particularly have a low content of volatile low molecular weight compounds, a low content of low-molecular weight polyolefin waxes and a low content of residues derived from the catalyst employed.

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