Process for preparing a catalyst support for polymerization of .alpha.-olefins, and support thus obtained
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United States of America Patent
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Oct 12, 2004
Grant Date -
Mar 13, 2003
app pub date -
Oct 24, 2002
filing date -
Jul 28, 1999
priority date (Note) -
Expired
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Abstract
A process is provided for preparing a catalyst support for polymerizing .alpha.-olefins comprising the steps of: (i) reacting, in the presence of a first electron donor, a chlorine-containing organic compound and a prior mixture of an alkylmagnesien and an aluminoxane and/or aluminosiloxane and/or alkylaluminum and, optionally, a second electron donor; and (ii) activating a product from step (i) in suspension in an inert liquid by means of an activation electron donor, together with the support thus obtained, a catalyst for polymerizing .alpha.-olefins, comprising this catalyst support and a group IV transition metal halide, and a process for polymerizing .alpha.-olefins, particularly propylene, comprising contacting the .alpha.-olefin with the catalyst.
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