Olefin polymerization catalyst

Details Olefin polymerization catalyst Olefin polymerization catalyst

1991-11-18

1993-06-29

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...

502103, 502112, 526160, 526165, C08F 464

Patent

active

052234657

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

This invention relates to an olefin polymerization catalyst.


TECHNICAL BACKGROUND

An olefin polymerization catalyst consisting of a vanadium compound having three ligands such as .beta.-diketone, etc. coordinated and an organoaluminum compound, in combination, is well known.
On the other hand, a titanium compound or zirconium compound each having two lignads coordinated is known, but it has not been reported that such a compound has a polymerization capacity of olefins.
The principal object of the present invention is to provide an olefin polymerization catalyst comprising, as a component, a transition metal compound having two ligands such as .beta.-diketone, etc. coordinated.
The inventors have made various studies and consequently, have found that the object of the present invention can be attained by combination of the transition metal compound with an organoaluminum compound, in particular, aluminoxane. The present invention is based on this finding. Disclosure of the Invention
Accordingly, the gist of the present invention consists in an olefin polymerization catalyst comprising:
(a) a transition metal compound represented by the general formula, ##STR2## wherein M represents titanium, zirconium, hafnium or vandium, Y.sup.1 and Y.sup.2 each represent, same or different, halogen atoms or alkyl groups containing 1 to 10 carbon atoms and R.sup.1, R.sup.2 and R.sup.3 each represent hydrogen atoms or hydrocarbon groups containing 1 to 10 carbon atoms, at least one of which is a hydrogen atom but all of which must not be hydrogen atoms, and
(b) an organoaluminum compound. Best Embodiment for practicing the Invention


Catalyst

The catalyst of the present invention consists of the above described transition metal compound (a) and the organoaluminum compound (b).
(a) Transition Metal Compound
The transition metal compound (a) (which will hereinafter be referred to as Compound (a)) is represented by the foregoing general formula.
In the general formula, M, Y.sup.1, Y.sup.2, R.sup.1, R.sup.2 and R.sup.3 have the same meanings as described above and M is preferably titanium or zirconium.
When Y.sup.1 and Y.sup.2 represent halogen atoms, examples of the halogen atom are chlorine, bromine, iodine and fluorine, and chlorine is particularly preferable. In the case of alkyl groups, examples of the alkyl group are methyl, ethyl, propyl, isopropyl, butyl, isobutyl, sec-butyl, pentyl, hexyl,- 2-ethylhexyl, octyl groups and the like. It is particularly preferable that Y.sup.1 and Y.sup.2 are both halogen atoms.
When R.sup.1, R.sup.2 and R.sup.3 are hydrocarbon groups, examples of the hydrocarbon groups are alkyl groups, cycloaklyl groups, aryl groups and aralkyl groups and the alkyl groups are preferable. The alkyl groups are selected from those exemplified as Y.sup.1 and Y.sup.2. Examples of the cycloaklyl groups are cyclopentyl, cyclohexyl, methylcyclohexyl groups and the like. Examples of the aryl group are phenyl, tolyl, xylyl, naphthyl groups and the like. Examples of the aralkyl groups are benzyl, phenethyl, 3-phenylpropyl groups and the like.
Examples of Compound (a) represented by the foregoing general formula will not be illustrated:
(i) Case wherein Y.sup.1 and Y.sup.2 are halogen atoms, R.sup.2 is a hydrogen atom and R.sup.1 and R.sup.3 are hydrocarbon groups.
CH.sub.3 /C.sub.6 H.sub.5 CH.sub.2 C.sub.6 H.sub.5 CH.sub.2 /C.sub.6 H.sub.5 CH.sub.2, C.sub.2 H.sub.5 /C.sub.6 H.sub.5 CH .sub.2, C.sub.6 H.sub.5 / C.sub.6 H.sub.5 CH.sub.2
(ii) Case wherein Y.sup.1 and Y.sup.2 are halogen atoms, R.sup.2 is a hydrocarbon group and one of R.sup.1 and R.sup.3 is a hydrogen atom and the other is a hydrocarbon group. CH.sub.3 /C.sub.2 H.sub.5 C.sub.6 H.sub.5 /CH .sub.3, CH.sub.3 /C.sub.6 H.sub.5, C.sub.6 H.sub.5 /C.sub.2 H.sub.5. C.sub.2 H.sub.5 / C.sub.6 H.sub.5 CH.sub.2 /CH.sub.3 C.sub.3 /C.sub.6 H.sub.5 CH.sub.2 C.sub.6 H.sub.5.sub.c
(iii) Case wherein Y.sup.1 and Y.sup.2 are halogen atoms, R.sup.2 is a hydrogen atom and one of R.sup.1 and R.sup.3 is a hydrogen atom and the other is a hydrocarbon gr

REFERENCES:
patent: 3634340 (1972-01-01), Gunther et al.
patent: 3670043 (1972-06-01), Kubicek et al.
patent: 4978730 (1990-12-01), Maezawa et al.

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