Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Plural component system comprising a - group i to iv metal...
Patent
1988-12-16
1992-06-16
Smith, Edward J.
Catalyst, solid sorbent, or support therefor: product or process
Catalyst or precursor therefor
Plural component system comprising a - group i to iv metal...
502103, 526127, 526128, 526129, 526153, 5263484, 526352, 526904, C08F 4642, C08F 1000
Patent
active
051224917
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a catalyst for polymerizing of an olefin and a process for polymerizing an olefin by using such a catalyst. More specifically, the present invention relates to a catalyst and a process for polymerizing a high-molecular weight olefin at a high polymerization activity even when the amount of expensive aluminoxane included in the catalyst is reduced. Further, the present invention relates to a catalyst and a process for polymerizing an olefin to produce an olefin polymer having a narrow molecular-weight distribution, and an olefin copolymer having a narrow composition distribution as well as a narrow molecular-weight distribution at a high polymerization activity when applied to the copolymerization of two or more olefins. Still further, the present invention relates to a catalyst and a process for polymerizing an olefin to produce an olefin polymer having a narrow molecular-weight distribution, a high bulk density, and excellent powder properties.
BACKGROUND TECHNOLOGY
.alpha.-olefin polymers, particularly ethylene polymer and an ethylene-.alpha.-olefin copolymer have generally been prepared by a known process wherein ethylene is polymerized, or ethylene and an .alpha.-olefin are copolymerized under the presence of a titanium-based catalyst comprising a titanium compound and an organoaluminum compound or a vanadium-based catalyst comprising a vanadium compound and an organoaluminum compound.
A new series of Ziegler catalysts comprising a zirconium compound and an aluminoxane have also been recently proposed for polymerization of an olefin.
Japanese Patent Application Kokai No. 58-19309 describes a process for polymerizing ethylene and at least one C.sub.3 -C.sub.12 .alpha.-olefin at a temperature of from -50.degree. to 200.degree. C. under the presence of a catalyst comprising a transition metal-containing compound represented by the formula: halogen, Me is a transition metal, and Hal is a halogen,
a linear aluminoxane represented by the formula:
a cyclic aluminoxane represented by the formula: ##STR1## wherein R and n are as defined above. It is also described that ethylene should be polymerized in the presence of a small amount, that is, up to 10% by weight of an .alpha.-olefin having a somewhat longer chain or the mixture thereof to adjust a density of the resulting polyethylene.
Japanese Patent Application Kokai No. 59-95292 describes processes for preparing a linear aluminoxane represented by the formula: ##STR2## wherein n is a number of 2 to 40 and R is a C.sub.1 -C.sub.6 alkyl, and a cyclic aluminoxane represented by the formula: ##STR3## wherein n and R are as described above. It is also disclosed that at least 25 million grams of polyethylene may be produced per 1 g of transition metal per hour when an olefin is polymerized in the presence of a mixture of, for example, methylaluminoxane prepared as described above and a bis(cyclopentadienyl) compound containing titanium or zirconium.
Japanese Patent Application Kokai 60-35005 discloses a process for preparing an olefin-polymerization catalyst comprising effecting a reaction between a magnesium compound and an aluminoxane compound represented by the formula: ##STR4## wherein R.sup.1 is a C.sub.1 -C.sub.10 alkyl radical, and R.sup.0 may represent R.sup.1 or, taken together, form --O--; chlorinating the reaction product; and treating the product with Ti, V, Zr, or Cr-containing compound to produce an olefin-polymerizing catalyst. It is also disclosed that this catalyst is particularly preferable for copolymerizing ethylene with a C.sub.3 -C.sub.12 .alpha.-olefin.
Japanese Patent Application Kokai No. 60-35006 discloses a catalyst system for polymers blended in a reactor which comprises a combination of (a) a mono-, di- or tri-cyclopentadienyl compound of at least two different transition metals, or a derivative thereof, and (b) an aluminoxane. Example 1 of this application discloses that a polyethylene having a number average molecular weight of 15,300, a weight average molecular weight of 36,400, a
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Kashiwa Norio
Kioka Mamoru
Toyota Akinori
Tsutsui Toshiyuki
Mitsui Petrochemical Industries Ltd.
Smith Edward J.
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