Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Plural component system comprising a - group i to iv metal...
Patent
1995-06-21
1998-03-17
Nagumo, Mark
Catalyst, solid sorbent, or support therefor: product or process
Catalyst or precursor therefor
Plural component system comprising a - group i to iv metal...
502115, 502125, 502126, 502129, 502119, 502128, 526119, 526128, 526143, 526943, 526144, 526132, C08F 4649
Patent
active
057286418
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a catalyst component for use in the polymerization or copolymerization of olefins. This catalyst component is high in catalytic efficiency, contains only a small amount of a modified organoaluminum compound, affords a polymer having a high molecular weight and a relatively wide molecular weight distribution, or a copolymer having a narrow composition distribution, and permits easy control of the molecular weight and molecular weight distribution. The present invention is further concerned with a catalyst using the said catalyst component and an olefin polymer preparing process using such catalyst. The olefin polymer as referred to herein is a generic term for both homopolymer and copolymer of olefins.
As means for obtaining an ethylenic polymer or ethylene/.alpha.-olefin copolymer having a narrow molecular weight distribution and a narrow composition distribution there recently has been proposed the use of a catalyst comprising a zirconium compound and an aluminoxane (JP58-19309A).
According to a process using such proposed catalyst there is obtained an ethylene copolymer in high yield which copolymer is narrow in both molecular weight distribution and composition distribution. However, the molecular weight of the copolymer is low and the amount of the aluminoxane used is large.
JP63-234005A proposes the use of a transition metal compound having a 2, 3 and 4-substituted cyclopentadienyl group to improve the molecular weight of the resulting polymer. In JP2-22307A it is proposed to use a hafnium compound having a ligand bonded to at least two crosslinked conjugated cycloalkadienyl groups for improving the molecular weight of the resulting polymer.
However, the use of hafnium as a transition metal is disadvantageous in that the yield of the resulting polymer is low.
It is the object of the present invention to provide a catalyst component and a catalyst using the same which catalyst component and catalyst can afford an olefin polymer having a high molecular weight and a relatively wide molecular weight distribution in high yield and in an extremely small amount of a modified organoaluminum compound used, as well as a polymer preparing process using the said catalyst.
Having made earnest studies in view of the above-mentioned object, the present inventors found out a novel catalyst capable of achieving the object and an olefin polymer preparing process using such catalyst.
The present invention relates to a catalyst component for the polymerization of olefins which catalyst component is prepared by contacting at least the following constituents (1), (2), (3) and (4) with one another: (OR.sup.2).sub.q X.sub.4-p-q wherein R.sup.1 and R.sup.2 are each independently a hydrocarbon group having 1 to 24 carbon atoms, X is a halogen atom, Me is Zr, Ti or Hf, p and q are each an integer in the ranges of 0.ltoreq.p.ltoreq.4 and 0.ltoreq.q.ltoreq.4, provided 0.ltoreq.p+q.ltoreq.4; represented by the following general formulas 1 to 4: X.sup.2.sub.z-m-n (OR.sup.7).sub.4-b-c !.sub.y ##STR2## where R.sup.3,R.sup.4, R.sup.5, R.sup.6, R.sup.7 and R.sup.8, which may be the same or different, are each independently a hydrocarbon group having 1 to 24 carbon atoms, Me.sup.2 is a Group 1, 2, 12 or 13 element in the Periodic Table of Elements, Me.sup.3 is a Group 13 element in the same Table, Me.sup.4 is a Group 1, 2, or 12 element in the same Table, X.sup.2 is a halogen atom, z is the valence of Me.sup.2,y is the valence of Me.sup.4, and m, n, a, b, c and d are each an integer in the ranges of 0.ltoreq.m.ltoreq.z, 0.ltoreq.n.ltoreq.z, provided 0.ltoreq.m+n.ltoreq.z, 0<a.ltoreq.3, 1.ltoreq.b.ltoreq.4, 1.ltoreq.c.ltoreq.3, provided 1.ltoreq.b+c.ltoreq.4; and 0.ltoreq.d.ltoreq.4; and
The present invention also relates to a catalyst for the polymerization of olefins, comprising the above catalyst component and a modified organoaluminum compound containing Al-O-Al bond prepared by the reaction of an organoaluminum compound and water.
The present invention further relates to a process for preparing an
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Aida Fuyuki
Matsuura Kazuo
Tajima Yoshio
Nagumo Mark
Nippon Oil Company Limited
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