Patent · US Expired

Preparation of homopolymers and copolymers of ethene using a chromium trioxide catalyst

US4845176A · kind A · utility

7Cited by

7References

1Claims

0Family size

Assignee

BASF SE

Inventors

Rainer Konrad · Putlitz, DE
Rainer Hemmerich · Havelsee, DE
Rudolf Mueller-Mall · Schifferstadt, DE
Guenther Schweier · Friedelsheim, DE

Key dates

Filing date	Oct 8, 1987
Grant date	Jul 4, 1989
Priority date	—
Expiry date	Oct 8, 2007

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S526/909
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

Ethene homopolymers and ethene copolymers with minor amounts of higher .alpha.-monoolefins are prepared by polymerization of the monomer or monomers using a chromium trioxide catalyst which is obtained by a method in which (1) a finely divided, porous, silicate carrier is laden with (2) chromium trioxide or a chromium compound which is converted to chromium trioxide under the conditions of stage (3), and then (3) the intermediate resulting from stage (2) is heated in an oxygen-containing gas stream. In this process, a cocatalyst which consists of a lithiumalkyl used in addition to the chromium trioxide catalyst.

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