| 摘要 |
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]: wherein M: a transition metal selected from Ti, Zr and Hf; R1: a monovalent C1-6 hydrocarbyl group, or a monovalent C1-6 hydrocarbyl group containing Si; R2: a divalent C4-20 hydrocarbyl group, or a divalent C4-20 hydrocarbyl group containing Si; R3: a divalent C1-30 hydrocarbyl group, or a divalent C1-30 hydrocarbyl group containing Si or Ge; and X and Y: H, halogen, a monovalent C1-20 hydrocarbyl group, or a monovalent C1-20 hydrocarbyl group containing N, O or Si. Component (B): Alumoxane having the following formula [II] or [III]: wherein m: 4 to 30; and R4: a monovalent hydrocarbyl group. A highly stereoregular polyolefin having a high molecular weight can be obtained by the above catalyst.
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