Transition metal complex, catalyst for olefin polymerization, an

Details Transition metal complex, catalyst for olefin polymerization, an Transition metal complex, catalyst for olefin polymerization, an

1998-06-26

2000-05-23

Bell, Mark L.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526133, 526134, 526153, 526160, 526943, 556 12, 556 52, 502103, 502117, 502118, 502119, 502123, 502124, 502125, 502128, C08F 444, C07F 700, C07F 728, B01J 3100, B01J 3700

Patent

active

060667044

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

The present invention relates to a transition metal complex useful as an olefin polymerization catalyst component, an olefin polymerization catalyst and a process for producing olefin polymers. In more particular, it relates to a transition metal complex useful as an olefin polymerization catalyst component which has a ligand comprising an aromatic ring having a hetero atom in the substituent and a cyclopentadienyl ring linked with each other by a hetero atom, an olefin polymerization catalyst and a process for producing olefin polymers.


BACKGROUND ART

A number of reports have already been made on the process for producing olefin polymers using a metallocene complex. For example, JP-A-58-19309 discloses a process for producing olefin polymers which uses a metallocene complex and an aluminoxane. The process has a problem in that when olein is polymerized with the disclosed catalyst which uses bis(cyclopentadienyl)zirconium dichloride and methylaluminoxane, the molecular weight of the olefin polymer obtained is low.
The specification of WO87/02370 discloses that the above-mentioned problem is improved by a transition metal complex having a ligand comprising two phenoxy groups linked each other by a sulfur atom. However, the system disclosed in WO87/02370 which uses 2,2'-thiobis(6-tert-butyl-4-methylphenoxy)titanium dichloride and methylaluminoxane and also a system disclosed in JP-A-5-230133 which uses 2,2'-thiobis(6-tert-butyl-4-methylphenoxy)titanium dichloride, triisobutylaluminum and triphenylmethane tetrakis(pentafluorophenyl)borate involve a problem in that the catalytic activity is unsatisfactorily low from the industrial point of view although the molecular weight of the polymer produced is improved.
JP-A-3-163088 discloses a transition metal complex which has a ligand comprising a cyclopentadienyl ring and an amino group linked thereto by a silicon atom, namely, (tert-butyl-amido)dimethyl(tetramethylcyclopentadienyl)silane zirconium dichloride.
However, no transition metal complex has yet been known which has a ligand comprising a cyclopentadienyl ring and an aromatic ring having oxygen atom in the substituent linked with each other by a sulfur atom or a phosphorus atom.
In recognition of the situation, the objects of the present invention are to provide a transition metal complex useful in industrial process as an olefin polymerization catalyst component which has a ligand comprising an aromatic ring having a hetero atom in the substituent and a cyclopentadienyl ring linked with each other by a hetero atom and to provide a highly active olefin polymerization catalyst and a process for producing olefin polymers.


DISCLOSURE OF THE INVENTION

The present invention relates to a transition metal complex represented by the following formula [1], an olefin polymerization catalyst containing the transition metal complex and a process for producing olefin polymers which uses the catalyst, ##STR2## wherein M is a transition metal atom of the group 4 of the periodic table of elements; Cp is a group having a cyclopentadiene type anionic skeleton; A and G are each a divalent residue containing an atom of the group 15 or 16 of the periodic table of elements and may be the same with or different from each other; X.sup.1, X.sup.2, R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are each independently a hydrogen atom, halogen atom, alkyl group with the number of carbon atoms of 1-20 optionally substituted with at least one halogen atom, aralkyl group with the number of carbon atoms of 7-20 optionally substituted with at least one halogen atom, aryl group with the number of carbon atoms of 6-20 optionally substituted with at least one halogen atom, substituted silyl group with the number of carbon atoms of 1-20 optionally substituted with at least one halogen atom, alkoxy group with the number of carbon atoms of 1-20 optionally substituted with at least one halogen atom, aralkyloxy group with the number of carbon atoms of 7-20 optionally substituted with at least one halogen atom, aryloxy group with the

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