Abstract: Provided are a catalyst component for olefin polymerization which is highly active, an olefin polymerization catalyst, and a process for producing an olefin (co)polymer using the catalyst. The catalyst component for olefin polymerization is characterized by comprising an ion-exchanged phyllosilicate having the property 1 and preferably further having the property 2, etc.

Abstract: Provided are a catalyst component for olefin polymerization which is highly active, an olefin polymerization catalyst, and a process for producing an olefin (co)polymer using the catalyst. The catalyst component for olefin polymerization is characterized by comprising an ion-exchanged phyllosilicate having the property 1 and preferably further having the property 2, etc.

Abstract: A syndiotactic styrenic polymer having a narrow molecular weight distribution which is a (co)polymer comprising at least one structural unit represented by the following Formula (1): wherein C1 of a phenyl group thereof has a tacticity of 30% or more in terms of a racemic pentad determined by 13C-NMR, and Ra and m are as defined in the specification. The disclosure is also directed to a block copolymer comprising the above polymer as one segment, to a block graft polymer prepared by modifying one block of the above polymer with a nitrogen-containing aromatic polymer, and to a process for preparing a syndiotactic styrenic polymer in which a styrenic monomer is polymerized in the presence of a catalyst comprising a reaction product of a transition metal compound and at least one co-catalyst selected from organic aluminunoxy compounds.

Abstract: A resistance voltage divider circuit of a gradation potential generation circuit for adjustment, which generates a gradation potential for driving a liquid crystal device. The circuit includes three resistors (11) which are equal in resistance value and have contacts (12) at equal positions. The contacts (12) at the equal positions of each resistors (11) are connected to one another so as to connect the resistors in parallel, reference potentials V1 and V2 are inputted across the resistors connected in parallel, and a gradation potential is generated on a junction point of the contact (12) according to a voltage divided by the resistors (11).

Abstract: A process for preparing olefinic living polymers having a molecular weight distribution (Mw/Mn) of 1 to 1.3, comprising polymerizing an olefinic monomer having 2 to 20 carbon atoms at low temperatures in the presence of a catalyst comprising (A) a hafnium or zirconium-containing compound having one or two cyclopentadienyl backbones, (B) a triphenyl boron compound or a tetraphenyl borate compound and optionally (C) a specific mono-, di- or trialkylaluminum compound. When the catalyst comprising the zirconium-containing compound is prepared by further using a titanium-containing compound (D), the polymerization temperature can be raised.

Abstract: A butadiene polymer (i) having a cis bond unit content of at least 50% based on the total butadiene units, a number average molecular weight (Mn) of 1,000 to 10,000,000, and at least 80%, based on the total molecular chains, of living chains containing a transition metal of group IV of the Periodic table at a terminal thereof; a polymer (ii) obtained by modifying terminals of the polymer (i); and a polymer (iii) obtained by coupling the polymers (i). These polymers (i), (ii) and (iii) are obtained by polymerizing a conjugated diene monomer alone or with a copolymerizable monomer at a specific temperature in the presence of a catalyst comprising a compound (A) of a transition metal of group IV of the periodic table having a cyclopentadienyl structure and a co-catalyst (B) selected from organoaluminum-oxy compound (a) and others and optionally further by contacting the resultant polymer with a terminal modifier or a coupling agent.

Abstract: A catalyst comprising an organoaluminum compound and a vanadium chelate compound having the lability to cause olefins to undergo living coordination polymerization is contacted with a terminal diolefin to obtain a catalyst for living polymer production. When the above contact is:conducted in the presence of a cycloolefin or an internal olefin, the yield of a living polymer can be improved. By modifying all ends of the living polymer obtained, a telechelic olefin polymer is obtained in which all the polymer chains are modified with functional groups.

Abstract: There is provided a novel silane compound, di-sec-butoxy-n-propyl methoxysilane. The aforesaid silane compound is prepared by reacting n-propyl trihalosilane with sec-butanol and then reacting a resultant reaction product with methanol.

Abstract: A catalyst for the polymerization of olefines comprises a solid catalytic component obtained by pre-polymerizing propylene in the presence of (A) a solid component containing magnesium, titanium, halogen and an electron-donating compound, (B) an organoaluminum compound, and (C) an alkylalkoxysilane represented by the formula, R.sup.1 Si(OR.sup.2)(OCH.sub.3).sub.2, wherein R.sup.1 represents a branched or cyclic alkyl group having 3 to 6 carbon atoms, and R.sup.2 represents a branched alkyl, alkenyl or alkinyl group having 3 to 6 carbon atoms; (B) an organoaluminum compound; and (D) an alkyltrialkoxysilane represented by the formula, R.sup.3 Si(OR.sup.4).sub.2 (OCH.sub.3), wherein R.sup.3 represents a linear alkyl group having 3 to 6 carbon atoms, and R.sup.4 represents a branched alkyl, alkenyl or alkinyl group having 3 to 5 carbon atoms.

Abstract: The invention relates to a novel process for producing a supported metallocene catalyst system useful for the polymerization and/or copolymerization of olefins, alpha-olefins, and/or diolefins which results in a catalyst product which during polymerization, produces minimal to no reactor fouling and polymer of controlled morphology. The invention is particularly useful for but not limited to polymerizing propylene or copolymerizing propylene with olefins having two or more carbon atoms. The novel support technique described herein results in a catalyst which will obtain polymer product having controlled, uniform particle size, narrow molecular weight distribution, high bulk density and depending upon the metallocene employed and monomers polymerized, stereoregularity.

Abstract: Disclosed is a mono- or di-amido silyldiyl bridged composition of matter useful as a catalyst component for the homo or copolymerization of olefins.

Abstract: Disclosed is a mono- or di-amido siladiyl bridged composition of matter useful as a catalyst component for the homo or copolymerization of olefins.

Abstract: The invention relates to a novel process for producing a supported metallocene catalyst system useful for the polymerization and/or copolymerization of olefins, alpha-olefins, and/or diolefins which results in a catalyst product which during polymerization, produces minimal to no reactor fouling and polymer of controlled morphology. The invention is particularly useful for but not limited to polymerizing propylene or copolymerizing propylene with olefins having two or more carbon atoms. The novel support technique described herein results in a catalyst which will obtain polymer product having controlled, uniform particle size, narrow molecular weight distribution, high bulk density and depending upon the metallocene employed and monomers polymerized, stereoregularity.

Abstract: The present invention aims at providing an olefin polymerization catalyst comprising, as a component, a transition metal compound having two ligands such as .beta.-diketone, etc. coordinated, and having excellent properties as a polymerization catalyst in the polymerization of olefins including styrene compounds. This olefin polymerization catalyst comprises:(a) a transition metal compound represented by the general formula, ##STR1## wherein M represents titanium, zirconium, hafnium or vanadium, Y.sup.1 and Y.sup.2 each represent, same or different, halogen atoms or alkyl groups containing 1 to 10 carbon atoms and R.sup.1, R.sup.2 and R.sup.3 each represent hydrogen atoms or hydrocarbon groups containing 1 to 10 carbon atoms, at least one of which is a hydrogen atom but all of which must not be hydrogen atoms, and(b) an organoaluminum compound, in particular, aluminoxane.

Abstract: This invention relates to a catalytic component for the polymerization of .alpha.-olefins and provides a catalytic component of magnesium support type capable of exhibiting a high stereoregularity while maintaining an improved strength as well as a high catalytic activity. The features thereof consist in a catalyst component for the polymerization of .alpha.-olefins obtained by contacting (A) a solid component comprising, as essential components, magnesium, titanium, a halogen and an electron-donating compound with (D) an olefin in the presence of (B) a trialkylaluminum and (C) a dimethoxy group-containing compound represented by the general formula R.sup.1 R.sup.2 Si(OCH.sub.3).sub.2 where R.sup.1 and R.sup.2 are, same or different, aliphatic hydrocarbon groups with 1 to 10 carbon atoms and having a volume, calculated by the quantum chemistry calculation, of 230 to 500 .ANG..sup.3 and an electron density of oxygen atoms in the methoxy group, calculated similarly, ranging from 0.685 to 0.800 A. U.

Abstract: The present invention relates to a catalyst for the polymerization of olefins, and provides a catalyst component of magnesium support type which has a high catalytic activity as well as improved catalytic grain strength sufficient for practical use and which hardly deteriorates even after storage for a long time. The catalyst component is obtained by contacting(a) metallic magnesium with(b) a hydrocarbon represented by the general formula RX wherein R is a hydrocarbon group of 1 to 20 carbon atoms and X is a halogen atom, then contacting the resulting composition with(c) a compound represented by the general formula X.sup.1 nM(OR.sup.1).sub.m-n wherein X.sup.1 is a hydrogen atom, halogen atom or a hydrocarbon group of 1 to 20 carbon atoms, M is a boron, carbon, aluminum, silicon or phosphorus atom, R.sup.1 is a hydrocarbon group of 1 to 20 carbon atoms, m is the atomic valence of M and m>n.gtoreq.0, and(d) a titanium alkoxide represented by the general formula Ti(OR.sup.2).sub.4 wherein R.sup.

Abstract: According to the present invention, there is provided a catalyst component of metal oxide support type which has a high catalytic activity, that is, a little catalyst residue in a polymer, as well as improved catalytic grain strength sufficient for practical use and which hardly deteriorates even after storage for a long time. The catalyst component is obtained by contacting(a) a metal oxide with(b) a dihydrocarbyl magnesium, then contacting the resulting composition with(c) a compound represented by the general formula X.sup.1 .sub.n M(OR.sup.1).sub.m-n wherein X.sup.1 is a hydrogen atom, halogen atom or a hydrocarbon group of 1 to 20 carbon atoms, M is a boron, carbon, aluminum, silicon or phosphorus atom, R.sup.1 is a hydrocarbon group of 1 to 20 carbon atoms, m is the atomic valence of M and m>n.gtoreq.0, and(d) a titanium alkoxide represented by the general formula Ti(OR.sup.2).sub.4 wherein R.sup.

Abstract: This invention relates to a process for the production of a catalytic component for the polymerization of olefins, in particular, for the production of a catalytic component capable of exhibiting a high polymerization activity in the polymerization of olefins and giving a polymer containing less low molecular weight components in effective manner. This process is characterized by a process for the production of a catalytic component for the polymerization of olefins, which comprises contacting (a) metallic magnesium, (b) a halogenated hydrocarbon represented by the general formula RX wherein R is an alkyl group, ary group or cycloalkyl group having 1 to 20 carbon atoms and (c) a compound represented by the general formula X.sup.1.sub.n M(OR.sup.1).sub.m-n in which X.sup.1 is a hydrogen atom, a halogen atom or a hydrocarbon group of 1 to 20 carbon atoms, M is boron, carbon, aluminum, silicon or phosphorus atom, R.sup.1 is a hydrocarbon group of 1 to 20 carbon atoms, m is the atomic valence of M and m>n.

Abstract: A catalytic component for olefin polymerization, produced by a process which comprises causing (A) magnesium metal, (B) a halogenated hydrocarbon represented by the general formula, RX [wherein R stands for an alkyl group, an aryl group, or a cycloalkyl group each having 1 to 20 carbon atoms and X for a halogen atom], and (C) a compound represented by the general formula, X.sub.n.sup.1 M(OR.sup.1).sub.m-n [wherein X.sup.1 stands for a hydrogen atom, a halogen atom, or a hydrocarbon group having 1 to 20 carbon atoms, M for a boron, carbon, aluminum, silicon, or phorphorus atom, R.sup.1 stands for a hydrocarbon group having 1 to 20 carbon atoms, m for the valency of M, and m>n.gtoreq.

Abstract: A method of producing a modified polypropylene comprising the step of graft-polymerizing a propylene random copolymer containing an unconjugated diene comonomer represented by the general formula: ##STR1## wherein R.sub.1 -R.sub.4 are H or an alkyl group having 1-6 carbon atoms, and n is an integer of 1-20, with a monomer having an unsaturated bond by a radical method.