Hoechst Aktiengesellschaft

Erwin Schrott

Helmut Strametz

Kurt Rust

Hans-Jurgen Kablitz

A catalyst of high activity and stereospecificity in .alpha.-olefin polymerization is obtained when titanium trichloride, prepared from titanium tetrachloride by reduction with an aluminum alkyl halide, is thermally treated, first with an ether in the presence of a cyclopolyene and the solid reaction product is then treated with an aluminum alkyl halide in the presence of a small amount of a cyclopolyene and/or an olefin. With the catalyst obtained high space-time yields of .alpha.-olefin polymers and copolymers can be produced.

Process for the manufacture of a catalyst

A catalyst of high activity and stereospecificity in .alpha.-olefin polymerization is obtained when titanium trichloride, prepared by reduction with aluminum alkyl halides, is treated first with an ether and then, without separation of the ether, with an aluminum alkyl halide in the presence of a small amount of a cyclopolyene and/or an olefin.

A catalyst of high activity and stereospecificity in .alpha.-olefin polymerization is obtained by subjecting titanium trichloride, prepared from titanium tetrachloride by reduction with aluminum alkyl halides, to two thermal treatments, the second one being carried out in the presence of an dialkyl ether and a cyclopolyene, and/or after-treating the solid reaction product with an aluminum alkyl halide, optionally in the presence of a small amount of a cyclopolyene and/or an olefin.

A catalyst of high activity and stereospecificity in .alpha.-olefin polymerization is obtained by subjecting titanium trichloride, obtained by reduction of titanium tetrachloride with aluminum alkyl halides, to two thermal treatments, the second thermal treatment being carried out in the presence of a dialkyl ether.

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Erwin Schrott