Patent · US Expired

Preparation of homopolymers and copolymers of propylene by means of a Ziegler-Natta catalyst system

US4761461A · kind A · utility

8Cited by

2References

1Claims

0Family size

Assignee

BASF SE

Inventors

James F. R. Jaggard · Ludwigshafen, DE
Rainer A. Werner · Annaberg-Buchholz, DE
Wolfgang Gruber · Bischofswerda, DE

Key dates

Filing date	Nov 14, 1986
Grant date	Aug 2, 1988
Priority date	—
Expiry date	Nov 14, 2006

Classification

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

Abstract

Polymers of polypropylene are prepared by means of a Ziegler-Natta catalyst system comprising (1) a titanium component which contains titanium, magnesium, chlorine and a benzenecarboxylic acid derivative, (2) an aluminum component and (3) a silane component, wherein the (1) used is obtained by (1.1) first reacting with one another (1.1.1) in a liquid hydrocarbon, (1.1.2) a finely divided magnesium halide, (1.1.3) an alkanol, (1.1.4) a phthalic acid ester and (1.1.5) titanium tetrachloride under certain conditions, (1.2) then extracting the solid intermediate obtained from (1.1) with titanium tetrachloride until the remaining solid substance has become significantly richer in magnesium, and (1.3) finally washing the solid substance remaining in (1.2) with an alkane in a certain manner.

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