Patent · US Expired

Process for preparing copolymers of propylene with other 1-alkenes

US5618895A · kind A · utility

56Cited by

4References

5Claims

0Family size

Assignee

BASF SE

Inventors

Juergen Kerth · Eisenberg (Pfalz), DE
Peter Koelle · Ludwigshafen, DE
Ralf Zolk · Bad Dürkheim, DE
Harald Schwager · Speyer, DE

Key dates

Filing date	Sep 16, 1993
Grant date	Apr 8, 1997
Priority date	—
Expiry date	Sep 16, 2013

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S526/916
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

Copolymers of propylene with other 1-alkenes, obtainable by gas-phase polymerization of a mixture of propylene and another 1-alkene in the absence of a liquid reaction medium under a pressure of from 15 to 30 bar, at from 60.degree. to 90.degree. C. and with an average holdup time of the polymer of from 1 to 5 hours, with the aid of a Ziegler-Natta catalyst system which, besides a titanium-containing solid component, contains an aluminum component and an electron donor, with the temperature being chosen so that, under the preset pressure, no condensation of the monomer mixture takes place in the gas space and, moreover, the ratio of the partial pressures of propylene and the other 1-alkene is adjusted to from 5:1 to 100:1, are particularly suitable for producing sheets and shaped articles.

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