Transition-metal compound having a bis-substituted-cyclopentadie

Details Transition-metal compound having a bis-substituted-cyclopentadie Transition-metal compound having a bis-substituted-cyclopentadie

1988-11-02

1990-06-05

Garvin, Patrick P.

Catalyst, solid sorbent, or support therefor: product or process

Catalyst or precursor therefor

Plural component system comprising a - group i to iv metal...

556 11, 556 53, 526127, 526150, C08F 464

Patent

active

049314173

ABSTRACT:
A novel transition-metal compound having a bis-substituted cyclopentadienyl ligand of bridged structure (I) and a novel mixture of the compound (I) with an aluminoxane (B), each useful as catalyst component(s) for stereoregular olefin polymerization are provided, which compound (I) is expressed by the formula ##STR1## wherein M is Zr or Hf; Y is Si or Ge; R.sup.1.sub.n -C.sub.5 H.sub.4-n and R.sup.1.sub.q -C.sub.5 H.sub.4-q each represent an unsubstituted or substituted cyclopentadienyl group; n and q each represent an integer of 0 to 4, but cases of n=q=0 and n=q=4 are excluded; R.sup.1 s may be same or different and each represent H, silyl or hydrocarbon radical; R.sup.2 s may be same or different and represent H or hydrocarbon radical; and Xs may be same or different and represent H, halogen or hydrocarbon radical; and which aluminoxane is expressed by the formula (II) or the formula (III) ##STR2## wherein m represents an integer of 4 to 30 and R.sup.3 represents a hydrocarbon radical.

REFERENCES:
patent: 4530914 (1985-07-01), Ewen et al.
patent: 4752597 (1988-01-01), Turner

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