Preparation of homopolymers and copolymers of ethene by Phillips catalysis

US4728703A · kind A · utility

Assignee

• BASF SE

Inventors

• Rainer Konrad · Putlitz, DE
• Volker Warzelhan · Bad Dürkheim, DE
• Hans Gropper · Schifferstadt, DE
• Guenther Schweier · Friedelsheim, DE

Key dates

• Filing date: Mar 20, 1987
• Grant date: Mar 1, 1988
• Expiry date: Mar 20, 2007

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F2410/01
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Ethene polymers are prepared by Phillips catalysis using (1) a supported catalyst which is loaded with chromium and titanium and (2) a co-catalyst, (1) having been obtained by preparing (1.1) a chromium- and titanium-loaded catalyst intermediate from (1.1.a) a silicate carrier material, (1.1.b) a selected chromium compound and (1.1.c) a selected titanium compound and then (1.2) heating said catalyst intermediate in an oxygen-containing gas stream, the (1) used having been obtained by, in general terms, (1.1) preparing in the first stage (1.1.1) a suspension from (1.1.1.1) a finely divided silicate carrier material and (1.1.1.2) a liquid alkane, (1.1.2) then (1.1.2.1) combining the suspension resulting from (1.1.1.) with (1.1.2.2.) a finely divided chromium trioxide, (1.1.3) thereupon (1.1.3.1) combining the suspension obtained from (1.1.2) with (1.1.3.2) an alkanol, (1.1.4) thereafter (1.1.4.1) combining the suspension formed in (1.1.3) with (1.1.4.2) a titanium compound of the formula Ti(OR).sub.4, where R is alkyl, aryl or cycloalkyl, and (1.1.5) finally evaporating the suspension obtained in (1.1.4) to dryness, and then (1.2) in the second stage first (1.2.1) treating the cataly…