Catalyst systems of the Ziegler-Natta type
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United States of America Patent
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Feb 25, 2003
Grant Date -
Sep 6, 2001
app pub date -
Jan 2, 2001
filing date -
Jan 21, 2000
priority date (Note) -
Expired
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Abstract
Catalyst systems of the Ziegler-Natta type comprise as active constituents a) a solid component comprising a compound of titanium or vanadium, a compound of magnesium, a particulate inorganic oxide as support and an internal electron donor compound, and as cocatalyst b) an aluminum compound and c) if desired, a further, external electron donor compound, wherein the particulate, inorganic oxide used has a specific surface area of from 350 to 1000 m.sup.2 /g and a mean particle diameter D in the range from 5 to 60 .mu.m and comprises particles which are composed of primary particles having a mean particle diameter d in the range from 1 to 10 .mu.m and contain voids or channels between the primary particles, where the macroscopic proportion of voids or channels having a diameter of greater than 1 .mu.m in the particles of the inorganic oxides is in the range from 5 to 30% by volume and the molar ratio of the compound of magnesium to the particulate, inorganic oxide is from 0.5:1 to 2.0:1.
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