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

US5034480A · kind A · utility

Assignee

• BASF SE

Inventors

• Guido Funk · Worms, DE
• Siegfried Weber · Stuttgart, DE
• Rainer Hemmerich · Havelsee, DE

Key dates

• Filing date: Sep 19, 1989
• Grant date: Jul 23, 1991
• Expiry date: Sep 19, 2009

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S526/901
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

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 and in the presence of a monohydric or polyhydric alcohol.