Preparation of homopolymers and copolymers of .alpha.-mono-olefins by means of a Ziegler-Natta catalyst system

US4385162A · kind A · utility

Assignee

• BASF SE

Inventors

• James F. R. Jaggard · Ludwigshafen, DE
• Peter Klaerner · Battenberg, DE
• Guenther Schweier · Friedelsheim, DE

Key dates

• Filing date: Apr 21, 1981
• Grant date: May 24, 1983
• Expiry date: Apr 21, 2001

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S526/906
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A process for the preparation of homopolymers and copolymers of .alpha.-monoolefins by means of a Ziegler-Natta catalyst system comprising (1) a titanium-III component, which is prepared by subjecting (1.1) a titanium trichloride/aluminum trichloride compound (a) and (1.2) an ester (b) to a certain type of milling treatment in which (A) a vibratory ball mill providing a relatively high milling acceleration is used, (B) the mill is first charged with the titanium-containing compound (a) and, if appropriate, is run for a certain period, thereafter (C) the ester (b) is added at a certain rate while milling the charge, thereupon (D) the charge is kept at +15.degree. C. or above for a certain period, while continuing the milling, hereupon (E), if appropriate, the product obtained from (D) is milled further for a certain period at +5.degree. C. or below, then (F), if appropriate, but advantageously so, the product obtained from (D) or (E) is kept at +20.degree. C. or above for a certain period, without milling, and thereafter (G), if appropriate, the product obtained from (F) is milled further for a certain period at +5.degree. C. or below, (2) an aluminum-alkyl component containing a ch…