| 摘要 |
A very effective catalyst system for olefin polymerisation consists of an aluminoxane and of a metallocene of the formula I <IMAGE> in which, preferably, M<1> is Zr or Hf, R<1> and R<2> are alkyl or halogen, R<3> and R<4> are hydrogen, R<5> and R<6> are alkyl or haloalkyl, -(CR<8>R<9>)m-R<7>-(CR<8>R<9>)n- is a chain with one or more members in which R<7> can also be a (subst.) hetero atom, m+n is zero or 1 and R<10> is hydrogen. The catalyst system provides polymers with high stereospecificity and high melting point. |
