Patent · US Expired

Preparation of ethylene polymers by the high-pressure method

US6949611B2 · kind B2 · utility

5Cited by

5References

14Claims

0Family size

Assignee

Basell Polyolefine GmbH · DE

Inventors

Lars Wittkowski · Mannheim, DE
Andreas Deckers · Flomborn, DE
Wilhelm Weber · Neustadt, DE
Thomas Dröge · Neustadt, DE
Andrei Gonioukh · Liblar, DE
Frank-Olaf Mähling · Mannheim, DE

Key dates

Filing date	May 14, 2004
Grant date	Sep 27, 2005
Priority date	—
Expiry date	May 17, 2024

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S585/946
WIPO fieldPharmaceuticals
WIPO sectorChemistry

Abstract

A process for preparing ethylene polymers by the high-pressure method comprises dissolving one or more free-radical initiators in one or more ketones of the formula I where R1 and R2 are identical or different and are selected from among C1-C6-alkyl and C3-C12-cycloalkyl and R1 and R2 may also be covalently linked to one another to form a 4- to 13-membered ring, prior to the polymerization,compressing the solution, metering it into the polymerization reactor at one or more points and subsequently carrying out the polymerization at from 150 to 380° C. and from 500 to 4500 bar.

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