Process for producing ethylene polymers
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United States of America Patent
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Apr 18, 1995
Grant Date -
N/A
app pub date -
Apr 21, 1993
filing date -
Apr 21, 1992
priority date (Note) -
Expired
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Abstract
A process for producing an ethylene polymer comprising bringing ethylene or ethylene and an .alpha.-olefin having 3 to 10 carbon atoms into contact with a catalyst comprising the following components (A) and (B): component (A): a solid component for a Ziegler type catalyst obtained by bringing a solid product obtained by sequentially contacting the following components (A-1), (A-2) and (A-3) and then washing the contact product formed into contact with the component (A-4): component (A-1): a solid catalyst component comprising the following components (i), (ii) and (iii) wherein component (i) is a magnesium dihalide; component (ii) is a titanium tetraalkoxide and/or a polytitanic acid ester; and component (iii) is a polymeric Si compound represented by the formula: ##STR1## (R.sup.1 : a hydrocarbyl group) component (A-2) which is an organoaluminum compound; component (A-3) which is a silicon halide; and component (A-4) which is an organoaluminum halide; and component (B) which is an organoaluminum compound. An ethylene polymer in a high activity and having a molecular weight distribution of a middle width can be produced stably on an industrial scale. Such an ethylene polymer is useful particularly as a resin for producing fibers and tapes.
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