Catalyst useful for the polymerization of olefins
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United States of America Patent
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Nov 7, 2000
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app pub date -
Jul 11, 1996
filing date -
Aug 20, 1991
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Abstract
A catalyst useful for the polymerization of olefins, comprising the following components (A) and (B): Component (A): A transition metallic compound having the following formula [I]: ##STR1## wherein M: a transition metal selected from Ti, Zr and Hf; R.sup.1 : a monovalent C.sub.1-6 hydrocarbyl group, or a monovalent C.sub.1-6 hydrocarbyl group containing Si; R.sup.2 : a divalent C.sub.4-20 hydrocarbyl group, or a divalent C.sub.4-20 hydrocarbyl group containing Si; R.sup.3 : a divalent C.sub.1-30 hydrocarbyl group, or a divalent C.sub.1-30 hydrocarbyl group containing Si or Ge; and X and Y: H, halogen, a monovalent C.sub.1-20 hydrocarbyl group, or a monovalent C.sub.1-20 hydrocarbyl group containing N, O or Si. Component (B): Alumoxane having the following formula [II] or [III]: ##STR2## wherein m: 4 to 30; and R.sup.4 : a monovalent hydrocarbyl group. A highly stereoregular polyolefin having a high molecular weight can be obtained by the above catalyst.
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