Preparation of homopolymers and copolymers of .alpha.-monoolefins using a Ziegler-Natta catalyst system

US4579919A · kind A · utility

Assignee

• BASF SE

Inventors

• Gerhard Staiger · Frankenthal (Pfalz), DE
• Wolfgang Gruber · Bischofswerda, DE

Key dates

• Filing date: Nov 20, 1984
• Grant date: Apr 1, 1986
• Expiry date: Nov 20, 2004

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F10/00
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

.alpha.-Monoolefins are polymerized using a catalyst system which comprises (1) a titanium component obtained by first (1.a) preparing an intermediate from (1.a.1) titanium tetrachloride, (1.a.2) a modifier and (1.a.3) a magnesium alcoholate, and the (1.b) preparing the titanium component from (1.b.1) titanium tetrachloride, (1.b.2) the intermediate from (1.a) and, if required, (1.b.3) a further modifier, (2) an alkylaluminum and (3) a cocatalyst. In this process, (i) the titanium component (1) used is obtained by first (1.1) preparing a first intermediate from (1.1.1) titanium tetrachloride, (1.1.2) a modifier obtained from (1.1.2.1) a titanate and (1.1.2.2) a phthaloyl dichloride, and (1.1.3) a magnesium alcoholate, then (1.2) preparing a second intermediate from (1.2.1) titanium tetrachloride, (1.2.2) the intermediate from (1.1) and, if required, (1.2.3) a phthaloyl dichloride as a further modifier, and finally (1.3) preparing the titanium component from (1.3.1) titanium tetrachloride and (1.3.2) the intermediate from (1.2), and (ii) the cocatalyst (3) used is a trialkoxysilane.