Claims
- 1. A method for polymerizing an olefin in the presence of a catalyst comprising a transition metal compound represented by the formula ##STR7## wherein each of A.sup.1, A.sup.2, A.sup.3 and A.sup.4 is a cyclopentadienyl group, an indenyl group, or a fluorenyl group; A.sup.5 is a hydrocarbondiylidene having 4 to 30 carbon atoms; A.sup.1 and A.sup.2 are bonded to the identical carbon atom in A.sup.5 and A.sup.3 and A.sup.4 are bonded to the identical carbon atom in A.sup.5 to form a crosslinked structure; each of R.sup.1 and R.sup.2 is a halogen, hydrogen, alkyl having 1 to 10 carbon atoms or a silicon-containing alkyl having 1 to 10 carbon atoms, aryl having 6 to 20 carbon atoms, alkylaryl having 6 to 20 carbon atoms, arylalkyl having 6 to 20 carbon atoms or a halogenated aryl having 6 to 20 carbon atoms; R.sup.1 and R.sup.2 are identical or different; each of M.sup.1 and M.sup.2 is titanium, zirconium or hafnium; and M.sup.1 and M.sup.2 are mutually identical or different,
- and a promoter.
- 2. The method according to claim 1 wherein an aluminoxane is used as the co-catalyst.
- 3. The method according to claim 1 wherein (a) an organic aluminum compound and (b) a compound capable of stabilizing transition metal cations are used as the co-catalysts.
- 4. A method for polymerizing an olefin in the presence of a catalyst comprising a promoter and at least two kinds of transition metal compounds which comprise a combination of transition metal compound represented by the formula ##STR8## wherein each of A.sup.1, A.sup.2, A.sup.3 and A.sup.4 is a cyclopentadienyl group, an indenyl group, or a fluorenyl group; A.sup.5 is a hydrocarbondiylidene having 4 to 30 carbon atoms; A.sup.1 and A.sup.2 are bonded to the identical carbon atom in A.sup.5 and A.sup.3 and A.sup.4 are bonded to the identical carbon atom in A.sup.5 to form a crosslinked structure; each of R.sup.1 and R.sup.2 is a halogen, hydrogen, alkyl having 1 to 10 carbon atoms or a silicon-containing alkyl having 1 to 10 carbon atoms, aryl having 6 to 20 carbon atoms, alkylaryl having 6 to 20 carbon atoms, arylalkyl having 6 to 20 carbon atoms, or a halogenated aryl having 6 to 20 carbon atoms; R.sup.1 and R.sup.2 are identical or different; each of M.sup.1 and M.sup.2 is titanium, zirconium or hafnium; and M.sup.1 and M.sup.2 are mutually identical or different,
- and another transition metal compound represented by the formula ##STR9## wherein each of A.sup.1 and A.sup.2 is a cyclopentadienyl group, an indenyl group or a fluorenyl group; A.sup.1 and A.sup.2 are identical or different; each of A.sup.6 and A.sup.7 is an alkyl having 1 to 10 carbon atoms, aryl having 6 to 20 carbon atoms, alkylaryl having 6 to 20 carbon atoms, arylalkyl having 6 to 20 carbon atoms, halogenated aryl having 6 to 20 carbon atoms or a heteroatom-containing hydrocarbon group having 6 to 20 carbon atoms wherein the heteroatom is selected from the group consisting of oxygen, nitrogen, sulfur and silicon, or a hydrogen; Q is a hydrocarbon having 1 to 10 carbon atoms or a silicon, germanium or tin-containing hydrocarbon having 1 to 10 carbon atoms, which links with A.sup.1 and A.sup.2 ; A.sup.6 and A.sup.7 may be mutually bonded to form a ring structure composed of A.sup.6, A.sup.7 and Q; each of R.sup.1 and R.sup.2 is a halogen, hydrogen, alkyl having 1 to 10 carbon atoms or a silicon-containing alkyl having 1 to 10 carbon atoms, aryl having 6 to 20 carbon atoms, alkylaryl having 6 to 20 carbon atoms, arylalkyl having 6 to 20 carbon atoms or a halogenated aryl having 6 to 20 carbon atoms; R.sup.1 and R.sup.2 are identical or different; and M is titanium, zirconium or hafnium.
- 5. The method according to claim 4 wherein an aluminoxane is used as the co-catalyst.
- 6. The method according to claim 4 wherein (a) an organic aluminum compound and (b) a compound capable of stabilizing transition metal cations are used as the co-catalysts.
Priority Claims (1)
Number |
Date |
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3-44682 |
Mar 1991 |
JPX |
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Parent Case Info
This application is a divisional, of application Ser. No. 07/941,056, filed Oct. 8, 1992, now U.S. Pat. No. 5,359,102.
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Divisions (1)
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Number |
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Parent |
941056 |
Oct 1992 |
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