Preparation of homo- and copolymers of propene by means of a Ziegler-Natta catalyst system

US5288824A · kind A · utility

Assignee

• BASF SE

Inventors

• Juergen Kerth · Eisenberg (Pfalz), DE
• Rainer Hemmerich · Havelsee, DE
• Peter Koelle · Ludwigshafen, DE
• Patrik Mueller · Kaiserslautern, DE

Key dates

• Filing date: Aug 25, 1992
• Grant date: Feb 22, 1994
• Expiry date: Aug 25, 2012

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F10/06
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Polymers of propene are prepared using a Ziegler-Natta catalyst system comprising (1) titanium component which is based on a finely divided, shape-imparting silica gel and contains titan- ium, magnesium, chlorine and a benzenecarboxylic acid derivative, (2) an aluminum component and (3) a silane component. The process employs a titanium component (1) which is obtained by a method in which (1.1) first (I) a carrier is prepared from (Ia) a silica gel which has a relatively high moisture content, (Ib) an organomagnesium compound and (Ic) a gaseous chlorinating agent in a manner such that (1.1.1) first (Ia) is reacted with (Ib), (1.1.2) then (Ic) is passed into the mixture obtained from (1.1.1), (1.2) then a solid-phase intermediate is prepared from (I), (II) an alkanol, (III) titanium tetrachloride and (IV) a phthalic acid derivative in a manner such that (1.2.1) first (I) is reacted with (II), (1.2.2) then (III) is introduced into the mixture resulting from (1.2.1), with the proviso that (IV) is also introduced in (1.2.1) or (1.2.2), (1.3) then the solid-phase intermediate resulting from (1.2) is extracted with titanium tetrachloride or with a titanium tetrachloride/-hydrocarbon mixt…