Compositions – Preservative agents – Anti-oxidants or chemical change inhibitants
Patent
1981-04-01
1983-06-07
Demers, Arthur P.
Compositions
Preservative agents
Anti-oxidants or chemical change inhibitants
252429C, C08F 404, C08F 402
Patent
active
043870457
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a novel olefin polymerization catalyst having a high activity.
BACKGROUND ART
The low pressure production process of polyethylene using a catalyst comprising an organomagnesium compound and a transition metal compound is already publicly known in the patent of K. Ziegler (Japanese Patent Publication No. 1546/1957). However, organomagnesium compound itself is insoluble in the inert hydrocarbon media used for the synthesis of catalyst and the polymerization reaction, so that it has never been used effectively and no success has ever been achieved in obtaining a high activity therefrom.
As catalysts of which activity is enhanced by using an organomagnesium compound in a specific form, there are known systems using, for example, an ether complex of organomagnesium halogenide, the so-called Grignard reagent, or one using organomagnesium alkoxide (Japanese Patent Publication No. 40,959/1972; Japanese Patent Kokai (Laid-Open) No. 19,274/1971). Though these catalysts exhibit a considerably high activity per atom of transition metal, they are still insufficient to omit the catalyst removal step of the polyethylene production process completely in that the halogen remains in the liquid reaction mixture to such an extent as being not disregarded.
The present inventors had already discovered a series of catalyst systems using a complex compound soluble in inert hydrocarbons. These catalysts systems comprise an organomagnesium compound together with an organoaluminum compound, an organozinc compound, an organoboron compound and an organoberyllium compound, respectively. (U.S. Pat. Nos. 3,989,878, 4,004,071, 4,027,087). These catalyst systems have a much higher activity than the above-mentioned disclosed catalysts and enable to omit the catalyst removal step completely.
DISCLOSURE OF INVENTION
As the result of further studies on the catalysts using an organomagnesium component, it was found that, surprisingly, a quite excellent catalyst of high activity for olefin polymerization can be obtained by the reaction between an organometallic compound and a specific solid obtainable by reacting a specific organomagnesium compound soluble in inert hydrocarbons with a titanium or vanadium compound, instead of using the above-mentioned complex of organomagnesium compound and organometallic compound. Based on this finding, this invention was accomplished.
Thus, this invention provides an olefin polymerization catalyst comprising a solid catalyst (I) and an organometallic compound (II), said solid catalyst (I) being obtained by reacting an organomagnesium compound (a) soluble in hydrocarbon solvents and represented by the following formula: secondary or tertiary alkyl group having 4-6 carbon atoms, X represents a negative group containing O, N or S atom, p and q represent a number of 0 to 2, r represents a number of 0 to 1, and p, q and r satisfy an equation: p+q+r=2, with a titanium or vanadium compound (b) having at least one halogen atom. This invention also provides a process for producing polyolefins by the use of said catalyst.
The first characteristic feature of the catalyst of this invention is that the catalytic efficiency is extremely high. Owing to the effect, the quantity of catalyst residue such as transition metal, halogen and the like remaining in polymer is small and the catalyst is suitable for use in a process from which the step of catalyst removal is omitted. The second characteristic feature is that the formed polymer has quite excellent particle characteristics such that the particle size of polymer is uniform, the polymer contains no coarse particles making trouble in the continuous polymerization, and the polymer has a high bulk density. The third characteristic feature is that the production of a polymer having a high molecular weight, a high stiffness, a sharp molecular weight distribution and a high impact strength can be achieved.
Another aspect of this invention provides an olefin polymerization catalyst comprising a combination of solid type catalyst (I'
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Furusato Masayasu
Ikegami Tadashi
Morita Hideo
Sakurai Hisaya
Asahi Kasei Kogyo Kabushiki Kaisha
Demers Arthur P.
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