Patent · US Expired

Method for carrying out radical ethylene high-pressure polymerization while preventing undesired polymer deposits

US6562915B2 · kind B2 · utility

6Cited by

5References

8Claims

0Family size

Assignees

Basell Polyolefine GmbH · DE
BASF SE

Inventors

Frank-Olaf Mähling · Mannheim, DE
Andreas Deckers · Flomborn, DE
Dieter Littmann · Heßheim, DE
Heinz Friedrich Sutoris · Bischofswerda, DE
Kaspar Evertz · Schifferstadt, DE

Key dates

Filing date	Jul 31, 2002
Grant date	May 13, 2003
Priority date	—
Expiry date	Jul 31, 2022

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08F110/02
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

In a process for the polymerization or copolymerization of ethylenically unsaturated monomers in the presence of polymerization initiators which decompose to form free radicals in a continuously operated polymerization apparatus comprising a fresh gas feed line, a precompressor, a postcompressor, a reactor, a pressure maintenance valve, a high-pressure circuit having a high-pressure product separator and a high-pressure circulation gas return line, a product valve and a low-pressure circuit having a low-pressure product separator and a low-pressure circulation gas return line, nitrogen monoxide or oxygen is introduced as inhibitor into the high-pressure circuit, into the low-pressure circuit and/or the precompressor.

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