Patent · US Expired

Method for producing ethylene copolymers in segmented tubular reactors and utilizing copolymers as a flow improver

US6610797B1 · kind B1 · utility

7Cited by

6References

26Claims

0Family size

Assignee

BASF SE

Inventors

Andreas Deckers · Flomborn, DE
Bernd Wenderoth · Lampertheim, DE
Peter Wedel · Worms, DE
Wilhelm Weber · Neustadt, DE

Key dates

Filing date	Jun 5, 2000
Grant date	Aug 26, 2003
Priority date	—
Expiry date	Jun 5, 2020

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC10L1/1973
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

In a process for preparing ethylene-vinyl acetate copolymers in which a mixture of ethylene and vinyl acetate is polymerized continuously in the presence of free-radical polymerization initiators and, if desired, molecular weight regulators in a cooled tube reactor at a pressure in the range from 1000 to 3500 bar, and the poly-merization initiator is added at the beginning and at two or more points along the tube reactor, and temperature changes in the reaction mixture along the tube reactor, between the first temperature maximum and the last addition of the polymerization initiator, are within a range of not more than 20° C.

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