Random propylene copolymer

US6221984A · kind A · utility

Assignee

• BASF SE

Inventors

• Meinolf Kersting · Neustadt, DE
• Werner Schone · Schriesheim, DE
• Franz Langhauser · Bad Dürkheim, DE

Key dates

• Filing date: May 21, 1998
• Grant date: Apr 24, 2001
• Expiry date: May 21, 2018

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S526/916
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Random copolymers of propylene with ethylene and at least one C.sub.4 -C.sub.10 -alk-1-ene, having a melting point, determined by the DSC method, of less than or equal to 135.degree. C., are obtainable by polymerization of propylene, ethylene and at least one C.sub.4 -C.sub.10 -alk-1-ene in the absence of a liquid reaction medium from the gas phase at from 50 to 100.degree. C. and a pressure of from 15 to 40 bar in the presence of a Ziegler-Natta catalyst system comprising PA0 a) a titanium-containing solid component comprising at least one halogen-containing magnesium compound, an electron donor and an inorganic oxide as support, PA0 b) an aluminum compound and PA0 c) a further electron donor compound, wherein the ratio of the partial pressures of propylene and ethylene is set to from 20:1 to 100:1 and the ratio of the partial pressures of the C.sub.4 -C.sub.10 -alk-1-ene(s) and ethylene is set to from 2.5:1 to 20:1. A process for preparing such random copolymers is also provided, and they can be used in films, fibers or moldings.