Abstract: An organic aluminoxy compound which shows 27Al nuclear magnetic resonance spectrum (27Al-NMR spectrum) having an A1/A2 ratio of at most 0.1, wherein A1 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 A2 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° C. or lower; and a catalyst for producing a polymer comprising any of the above organic aluminoxy compounds and a transition metal compound.

Abstract: 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.

Abstract: 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.

Abstract: A process for producing a styrenic polymer having the syndiotactic configuration which process comprises a plurality of polymerization stages, at least one polymerization stage selected as desired from the plurality of polymerization stages being a polymerization stage in which hydrogen is introduced; in accordance with the present invention, efficient control of molecular weight and molecular weight distribution is enabled. By increasing activity of the polymerization catalyst, the amount of the catalyst and the amount of residual metals can be decreased, and the cost of production can be decreased.

Abstract: 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,4M.sup.4 --C.sub.6 Y.sup.3.sub.5 +BCl.sub.3 .fwdarw.M.sup.4 B(C.sub.6 Y.sup.3.sub.5).sub.4wherein M.sup.4 is an alkali or alkaline earth metal, or represents R.sup.6.sub.2 Al, wherein R.sup.6 is an alkyl group, and Y.sup.3 is a hydrogen atom or a halogen atom.

Abstract: 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.

Abstract: There are disclosed a catalyst well suited for producing a styrenic polymer having a high degree of syndiotactic configuration which comprises a transition-metal compound such as pentamethylcyclopentadienyltrimethyltitanium and a coordination complex compound comprising an anion in which a plurality of radicals are bonded to a metal and a quaternary ammonium salt, the compound being exemplified by orthocyano-N-methylpyridinium tetra(pentafluorophenyl)borate, or comprises an alkylating agent such as triisobutylaluminum in addition to the above two compounds; and a process for producing a styrenic polymer having a high degree of syndiotactic configuration by polymerizing a styrenic monomer using the aforementioned catalyst. Consequently, a styrenic polymer having a high degree of syndiotactic configuration can be produced effectively without the use of an expensive aluminoxane required in a large amount if used.

Abstract: 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.