Patent · US Expired

Catalyst for the preparation of high molecular weight homopolymers and copolymers of ethene, and the manufacture thereof

US5189123A · kind A · utility

10Cited by

4References

6Claims

0Family size

Assignee

BASF SE

Inventors

Hans Gropper · Schifferstadt, DE
Guido Funk · Worms, DE
Erich Kolk · Bad Dürkheim, DE
Dieter Oeder · Bad Dürkheim, DE

Key dates

Filing date	Oct 19, 1990
Grant date	Feb 23, 1993
Priority date	—
Expiry date	Oct 19, 2010

Classification

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

Abstract

The present invention relates to a novel catalyst for the preparation of high molecular weight homopolymers and copolymers of ethene, which catalyst is obtainable by PA0 (1) loading a support based on silicon dioxide with PA0 (2) either chromium trioxide or a chromium compound capable of being converted to chromium trioxide under the conditions of stage (3) below and then PA0 (3) heating the resulting intermediate in a gas stream containing oxygen. the support (1) being a special silica xerogel obtained by extracting not more than 30% of the water from a silica hydrogel by means of an alkanol, an alkanone or a mixture thereof followed by drying, comminution and fractional screening.

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