Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Plural component system comprising a - group i to iv metal...
Patent
1997-05-01
1999-08-03
Bell, Mark L.
Catalyst, solid sorbent, or support therefor: product or process
Catalyst or precursor therefor
Plural component system comprising a - group i to iv metal...
502125, 502116, 502132, 502114, 502133, 5261249, 526128, B01J 3100, B01J 3700, C08F 402, C08F 460
Patent
active
059325100
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a solid catalyst component and catalyst for polymerization of olefins which can provide a polymer having a high stereoregularity, excellent particle properties, in particular a high bulk density, and a small content of fine powder in a high yield.
More particularly, the present invention relates to a solid catalyst component and catalyst for polymerization of olefins which can provide a copolymer having excellent particle properties in a high yield even if the production ratio of rubber-like polymer is raised in the block copolymerization of olefins.
TECHNICAL BACKGROUND
Many proposals have been made and known for a solid catalyst component comprising a titanium halide compound, a magnesium compound and an electron donor compound as essential components and a process for the polymerization of olefins in the presence of a catalyst comprising said solid catalyst component, an organic aluminum compound and a third component such as a silicon compound.
Further, a solid catalyst component prepared from a dialkoxymagnesium and titanium tetrachloride as main starting materials and a catalyst for polymerization of olefins made of said solid catalyst component, an organic aluminum compound and a third component such as a silicon compound have been known as disclosed in JP-A-63-3010 (The term "JP-A" as used herein means an "unexamined published Japanese patent application"), JP-A-1-221405, JP-A-1-315406, JP-A-3-227309, JP-A-3-70711, JP-A-4-8709, and many other references.
The foregoing various techniques focus on the development of a catalyst component which is active enough to allow the omission of a so-called deashing step, i.e., step of removing catalyst residues such as chlorine and titanium remaining in the polymer produced by the polymerization of propylene in the presence of a catalyst as well as on the enhancement of the yield of stereoregular polymer. These techniques can provide excellent results on these purposes.
However, if a polymerization catalyst having a composition comprising this kind of a high activity type catalyst component, an organic aluminum compound and an electron donor compound such as silicon compound is employed to polymerize olefins, the polymer thus produced contains much fine powder derived from fine solid catalyst component itself or obtained by fragmentation due to reaction heat during polymerization. Thus, the polymer has a broad particle size distribution. As a result, the bulk density of the polymer thus produced tends to drop. If the content of the fine polymer is raised, the continuance of uniform reaction can be inhibited. Further, the pipe in the polymerization process can be blocked. Moreover, some troubles can occur at the separation step and the drying step of the polymer thus produced. It has been desired to solve these problems. In addition, if the particle size distribution is widened, it eventually gives undesirable effects on the formation of the polymer. If the bulk density of the polymer thus produced is lowered, the resulting productivity is extremely lowered. This is the reason why a polymer having as small fine polymer content as possible and a high bulk density has been desired.
In order to solve these problems, many methods have been proposed and are known for polymerizing olefins in the presence of a solid catalyst component comprising as essential components a magnesium compound such as dihalogenated magnesium and alkylmagnesium compounds, a titanium compound, an electron donor compound and a polysiloxane or a catalyst comprising said solid catalyst component, an organic aluminum compound and a third component such as a silicon compound. For example, JP-A-61-204202 discloses a catalyst component for polymerization of olefins prepared by allowing the reaction product of dihalogenated magnesium, titanium tetraalkoxide and hydrogenated polysiloxane, an acid halide compound and a silicon halide compound to come in contact with one another. Further, JP-A56-152811 discloses a process for the production of a poly
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Goto Kenji
Hosaka Motoki
Kataoka Takuo
Ogawa Hayashi
Bell Mark L.
Pastercyzk J.
Toho Titanium Co., Ltd.
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