Patent · US Expired

Avoidance of colored impurities in the preparation of ultrahigh molecular weight ethylene polymers by means of a titanium-containing catalyst system

US5034481A · kind A · utility

35Cited by

7References

6Claims

0Family size

Assignee

BASF SE

Inventors

Guido Funk · Worms, DE
Siegfried Weber · Stuttgart, DE
Juergen Kerth · Eisenberg (Pfalz), DE
Rainer Hemmerich · Havelsee, DE

Key dates

Filing date	Sep 19, 1989
Grant date	Jul 23, 1991
Priority date	—
Expiry date	Sep 19, 2009

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S526/901
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

Ultrahigh molecular weight ethylene polymers are prepared in the gas phase in a thoroughly mixed bed of finely divided polymer by continuous introduction of the monomer into a polymerization system at 60.degree.-120.degree. C. and 5-60 bar in the presence of a reaction product of a titanium-containing catalyst and an antistat.

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