Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Plural component system comprising a - group i to iv metal...
Patent
1997-08-13
1999-10-12
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...
502107, 502114, 502115, 502116, 502125, 502126, 502132, 502133, 5261253, 5261246, 526128, B01J 3100, B01J 3700, C08F 402, C08F 460
Patent
active
059654783
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a solid catalyst component for polymerization of olefins and a catalyst for polymerization of olefins which can provide a polymer having a high stereoregularity and excellent particle properties, in particular a high bulk density, in a high yield in the polymerization of olefins. More particularly, the present invention relates to a solid catalyst component for polymerization of olefins and a 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 for a solid catalyst component for polymerization of olefins comprising magnesium, titanium, an electron donor compound and a halogen as essential components, a catalyst for polymerization of olefins comprising said solid catalyst component, an organic aluminum compound, an organic silicon compound, etc., and a process for the polymerization of olefins which comprises polymerizing or copolymerizing olefins in the presence of said catalyst.
For example, JP-A-63-3010 (The term "JP-A" as used herein means an "unexamined published Japanese patent application") proposes a catalyst for polymerization of olefins comprising a solid catalyst component prepared by a process which comprises allowing a dialkoxymagnesium, a diester of aromatic dicarboxylic acid, an aromatic hydrocarbon and a titanium halide to come in contact with one another, and then subjecting the product to heat treatment in powder form, an organic aluminum compound and an organic silicon compound, and a process for the polymerization of olefins.
Further, JP-A-1-315406 proposes a catalyst for polymerization of olefins comprising a solid catalyst component prepared by a process which comprises allowing a suspension of diethoxymagnesium in an alkylbenzene to come in contact with titanium tetrachloride, adding phthaloyl dichloride to the suspension for reaction to obtain a solid product, and then allowing the solid product to come in contact with titanium tetrachloride in the presence of an alkylbenzene, an organic aluminum compound and an organic silicon compound, and a process for the polymerization of olefins in the presence of said catalyst.
The foregoing various conventional 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 as well as on the enhancement of the yield of stereoregular polymer and the maintenance of the catalytic activity during polymerization. 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 a 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 developed during polymerization. Thus, the polymer tends to have a broad particle size distribution. If the content of the fine particle size polymer is raised, it causes the inhibition of the process. For example, the continuance of uniform reaction can be inhibited. Further, the pipe in the polymerization process can be blocked during the transfer of the polymer. In addition, if the particle size distribution is widened, it eventually gives undesirable effects on the molding of the polymer. This is the reason why a polymer having as small fine particle size polymer content as possible, a uniform particle size and a narrow particle size distribution has been desired.
In order to solve these problems, many methods have been proposed. For example, JP-A-6-157659 proposes a catalyst for polymerization of olefins made of a solid catalyst compo
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Goto Kenji
Hosaka Motoki
Ohtsuka Tetsuo
Saito Akira
Bell Mark L.
Pasterczyk J.
Toho Titanium Co., Ltd.
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