Catalysts for the polymerization of olefins and process for the preparation thereof
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United States of America Patent
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Nov 5, 2002
Grant Date -
Jul 11, 2002
app pub date -
Jun 29, 1999
filing date -
Oct 29, 1997
priority date (Note) -
Expired
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Abstract
Catalysts for the polymerization of olefins are disclosed, comprising the product obtainable by contacting: (A) a bridged and/or substituted cyclopentadienyl compound of Ti, Zr or Hf; (B) one or more organometallic aluminium compounds of formula (II): AlR.sup.4.sub.3-z H.sub.z wherein the substituents R.sup.4, same or different from each other, are linear or branched, saturated or unsaturated C.sub.1 -C.sub.20 alkyl or alkylaryl radicals, optionally containing Si or Ge atoms, wherein at least one of the substituents R.sup.4 is different from a straight alkyl group; z is 0 or 1; and (C) water, the molar ratio between the organometallic aluminium compound and water being comprised between 1:1 and 100:1; said catalyst being obtainable by a process comprising the following steps: (i) contacting component (A) with part of component (B) in the absence of component (C); (ii) contacting part of component (B) with component (C) in the absence of component (A) and successively (iii) contacting the products obtained in steps (i) and (ii).
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