Idemitsu Kosan Company, Limited

Idemitsu Petrochemical Co., Ltd.

Shoji Naganuma

Norio Tomotsu

Masami Watanabe

Tsuyoshi Kondoh

An organic aluminoxy compound which shows,Al nuclear magnetic resonance spectrum (,Al-NMR spectrum) having an A,/A,ratio of at most 0.1, wherein A,is area of a region encompassed by a segment of a line which connects a local minimum point existing between a continuous curve &ldquo;a&rdquo; containing a peak appearing at around 150 ppm and a continuous curve &ldquo;b&rdquo; containing a peak appearing at around 60 ppm to the point where the above curve &ldquo;b&rdquo; comes into contact with the base line and also by the above curve &ldquo;b&rdquo; and A,is area of a region encompassed by the above curves &ldquo;a&rdquo; and &ldquo;b&rdquo; and also by the base line; an organic aluminoxy compound containing at least 5%, expressed in terms of aluminum atom, of a portion insoluble in a mixed solvent of toluene and hexane in a ratio by volume of 2:5 at 30&deg; C. or lower; and a catalyst for producing a polymer comprising any of the above organic aluminoxy compounds and a transition metal compound. The above catalyst is a homogeneous catalyst having high and stable activity and used for polymerization of olefins and styrenes.

Organic aluminoxy compound and catalyst for producing polymer

An organic aluminoxy compound which shows .sup.27 Al nuclear magnetic resonance spectrum (.sup.27 Al-NMR spectrum) having an A.sub.1 /A.sub.2 ratio of at most 0.1, wherein A.sub.1 is area of a region encompassed by a segment of a line which connects a local minimum point existing between a continuous curve 'a' containing a peak appearing at around 150 ppm and a continuous curve 'b' containing a peak appearing at around 60 ppm to the point where the above curve 'b' comes into contact with the base line and also by the above curve 'b' and A.sub.2 is area of a region encompassed by the above curves 'a' and 'b' and also by the base line; an organic aluminoxy compound containing at least 5%, expressed in terms of aluminum atom, of a portion insoluble in a mixed solvent of toluene and hexane in a ratio by volume of 2:5 at 30.degree. C. or lower; and a catalyst for producing a polymer comprising any of the above organic aluminoxy compounds and a transition metal compound. The above catalyst is a homogeneous catalyst having high and stable activity and used for polymerization of olefins and styrenes.

Process for producing a styrenic polymer

A process for preparing a tetrakisfluorophenylborate which is useful as a catalyst component for the polymerization of olefins or as a raw material for synthesizing the same, efficiently at a high productivity per unit amount of a solvent and at a high yield. A mixed solvent of ether and an aliphatic hydrocarbon is used as a reaction solvent for preparing tetrakisphenylborate according to the following reaction formula,

Process for producing tetrakisflorophenylborate

A polymerization catalyst comprising a polycation complex (A) represented by the following Formula, [(CUHC).sub.n MX.sub.m ].sup.j+ .multidot.([Y].sup.-)j; [(CUHC): a cyclic unsaturated hydrocarbon group], more particularly, a polymerization catalyst comprising the reaction product of a transition metal compound and an ionic compound (b) capable of forming an ionic complex when reacted with a transition metal compound, and the above-mentioned compound (b), is disclosed.

Polymerization catalysts and process for producing polymers

Process for producing a styrenic polymer and a catalyst for use therein

There are disclosed a catalyst which comprises a specific transition-metal compound (A) and a specific coordination complex compound (B) instead of aluminoxane, and a process for producing a styrene polymer at a reduced cost with improved efficiency by the use of the above catalyst. The catalyst according to the present invention is inexpensive compared with the conventional catalyst containing aluminoxane as the major ingredient, and exhibits a high activity in the polymerization of a styrenic monomer into styrene polymer with a high degree of syndiotacticity as well as a high yield and conversion rate.

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Ichihara, Japan

Shoji Naganuma