Patent · US Expired

Manufacture of ethylene polymers in a two-zone tubular reactor at pressure above 500 bars

US4076919A · kind A · utility

9Cited by

6References

5Claims

0Family size

Assignee

BASF SE

Inventors

Friedrich Urban
Oskar Buechner · Dudenhofen, DE
Ulrich Hartig · Hermeskeil, DE
Hans Gropper · Schifferstadt, DE

Key dates

Filing date	Nov 15, 1976
Grant date	Feb 28, 1978
Priority date	—
Expiry date	Nov 15, 1996

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08F10/02
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

Ethylene polymers are manufactured in a tubular reactor under high pressure and at high temperatures in the presence of polymerization initiators. The polymerization is carried out in two different zones of the reactor, a mixture of ethylene, oxygen and regulator being fed into the first zone and a co-initiator having a half-life temperature, measured in benzene, of above 140.degree. C being additionally fed into the second zone. The co-initiator may be a peroxide or a hydroperoxide. The melt index, or the haze and gloss of a film produced from the resulting ethylene polymer, can be varied advantageously through the choice of the co-initiator.

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