Catalysts and processes for the polymerization of olefins
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United States of America Patent
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May 6, 2003
Grant Date -
N/A
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, which comprise the product obtained by contacting: (A) a bridged and/or substituted cyclopentadienyl compound of titanium, zirconium or hafnium; (B) an organometallic aluminium compound of the formula: Al(CH.sub.2 --CR.sup.4 R.sup.5 --CR.sup.6 R.sup.7 R.sup.8).sub.w R.sup.9.sub.q H.sub.z wherein R.sup.4 is a C.sub.1 -C.sub.10 alkyl, alkenyl, or arylalkyl group; R.sup.5 is hydrogen or a C.sub.1 -C.sub.10 alkyl, alkenyl, or arylalkyl group; R.sup.6 and R.sup.7 are C.sub.1 -C.sub.10 alkyl, alkenyl, aryl, arylalkyl or alkylaryl groups; R.sup.8 is hydrogen or a C.sub.1 -C.sub.10 alkyl, alkenyl, aryl, arylalkyl or alkylaryl group; R.sup.9 is a C.sub.1 -C.sub.10 alkyl, alkenyl, or arylalkyl group, a carbon atom in the compound of formula (II) being optionally replaced by a Si or Ge atom; w is 1-3, z is 0 or 1, q=3-w-z, and (C) water; the molar ratio (B)/(C) being comprised between 1:1 and 100:1. These catalysts show an improved activity with respect to known catalysts, wherein different aluminium compounds are used.
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