Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Patent
1988-08-11
1993-04-20
Smith, Edward J.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
502103, 526348, 5263484, 526351, 526160, C08F 4642, C08F 1000
Patent
active
052044190
DESCRIPTION:
BRIEF SUMMARY
TECHNOLOGICAL FIELD
The present invention relates to a process for polymerizing olefins. Specifically, the present invention relates to a process for polymerizing olefins with excellent polymerization activity to produce an olefin polymer having a large molecular weight. More specifically, the present invention relates to a process for producing an olefin polymer having a narrow molecular weight distribution and, when applied to the copolymerization of at least two olefins, an olefin copolymer having a narrow molecular weight distribution and a narrow composition distribution, with excellent polymerization activity.
BACKGROUND TECHNOLOGY
For the production of an alpha-olefin polymer, particularly an ethylene polymer or an ethylene/alpha-olefin copolymer, methods have previously been known in which ethylene is polymerized, or ethylene and an alpha-olefin are copolymerized, in 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.
On the other hand, catalysts comprising a zirconium compound and an aluminoxane have been proposed recently as a new type of Ziegler catalyst for olefin polymerization.
Japanese Laid-Open Patent Publication No. 19309/1983 describes a process which comprises polymerizing ethylene and at least one alpha-olefin having 3 to 12 carbon atoms at a temperature of -50.degree. to 200.degree. C. in the presence of a catalyst composed of a transition metal-containing catalyst represented by the following formula Me represents a transition metal, and Hal represents halogen, and a linear aluminoxane represented by the following formula cyclic aluminoxane represented by the following formula ##STR1## wherein R and n have the same definitions as given above.
This patent document states that in order to adjust the density of the resulting polyethylene, ethylene should be polymerized in the presence of a small amount (up to 10% by weight) of a slightly long-chain alpha-olefin or a mixture thereof.
Japanese Laid-Open Patent Publication No. 95292/1984 describes an invention relating to a process for producing a linear aluminoxane represented by the following formula ##STR2## wherein n is 2 to 40 and R is C.sub.1 -C.sub.6 alkyl, and a cyclic aluminoxane represented by the following formula ##STR3## wherein R and n have the same definitions as given above.
This publication states that when an olefin is polymerized using a mixture of, for example, methylaluminoxane produced by the above process with a bis(cyclopentadienyl) compound of titanium or zirconium, a polyethylene is obtained in an amount of at least 25 million grams per gram of the transition metal per hour.
Japanese Laid-Open Patent Publication No. 35005/1985 discloses a process for producing a catalyst for polymerization of olefins, which comprises reacting an aluminoxane compound represented by the following formula ##STR4## wherein R.sup.1 represents C.sub.1 -C.sub.10 alkyl, and R.sup.0 is R.sup.1 or is bonded to represent --O--, with a magnesium compound, then chlorinating the reaction product, and treating the chlorinated product with a compound of Ti, V, Zr or Cr. The above publication describes that the above catalyst is especially suitable for the copolymerization of ethylene with a C.sub.3 -C.sub.12 alpha-olefin mixture.
Japanese Laid-Open Patent Publication No. 35006/1985 discloses a combination of (a) at least two different compounds selected from a mono-, di- or tri-cyclopentadienyl compound of transition metals or its derivative with (b) an alumoxane (an aluminoxane) as a catalyst system for blending polymers in a reactor. Example 1 of this publication discloses that a polyethylene having a number average molecular weight of 15,300 and a weight average molecular weight of 36,400 and containing 3.4 mole % of a propylene component was obtained by polymerizing ethylene and propylene using bis(pentamethylcyclopentadienyl)dimethylzirconium and an alumoxane as a catalyst. In Example 2 of this pu
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Kashiwa Norio
Toyota Akinori
Tsutsui Toshiyuki
Mitsui Petrochemical Industries Ltd.
Smith Edward J.
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