| 摘要 |
PURPOSE:To obtain a polymerization catalyst with which a highly stereoregular polyolefin having a high mol.wt. can be produced in high yields by blending a specific transition metal compound with a specific alumoxane. CONSTITUTION:The title catalyst comprises a blend of a transition metal compound represented by formula I (wherein M is Ti, Zr, or Hf; R<1> is an Si- containing monovalent 1-6C hydrocarbon group; R<2> is an Si-containing divalent 4-20C hydrocarbon group bonded to two adjacent C atoms of each five-membered ring ligand; R<3> is an Si-or Ge-containing 1-30C hydrocarbon group; X and Y each is H, a halogen, or an N-, O-, or Si-containing monovalent 1-20C hydrocarbon group; and the two five-membered ring ligands each having substituents R<1> and R<2> are asymmetrical about a plane including with respect to relative position based on the R<3> group) with an alumoxane represented by formula II or III (wherein m is 4 to 30 and R<4> is a monovalent hydrocarbon group). This catalyst provides a stereoregular polyolefin having a high mol.wt. in high yields.
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