Abstract: Ethylene and alpha-olefins are homopolymerized or copolymerized with another olefin monomer in the presence of a catalyst system comprising an organo metal cocatalyst and a titanium-containing catalyst component, said titanium-containing catalyst component being obtained by reacting together a porous particulate material, an organic magnesium compound, an oxygen containing compound, an acyl halide and titanium tetrachloride and Cl.sub.2, Br.sub.2 or an interhalogen.

Abstract: A process for preparation of a component of a catalyst for polymerization of .alpha.-olefins is disclosed. The process comprises the steps of heating a titanium containing component during and/or after milling operation thereof. The titanium-containing catalyst component thus produced makes it possible to produce polymers having a high stereoregularity in high specific yield.

Abstract: A solid catalyst component for olefin polymerization which is produced by reacting (A) a silicon compound with (B) a compound of transition metal of Groups IVa, Va and VIa of the periodic table to obtain a reaction mixture (I), reacting the reaction mixture (I) with (C) an organomagnesium compound selected from organomagnesium compounds or hydrocarbon-soluble complexes between an organomagnesium compound and an organometal compound capable of allowing said organomagnesium compound to be soluble in hydrocarbons to obtain an intermediate product (II), and contacting the intermediate product (II) with (D) an organoaluminum halide compound represented by the general formula R.sub.c.sup.1 AlX.sub.3-c (wherein R.sup.1 is an organic group containing 1 to 20 carbon atoms, X is a halogen and c is a number defined by 0<c<3) and (E) an oxidative compound.

Abstract: A process for producing an .alpha.-olefin polymer which comprises polymerizing an .alpha.-olefin in the presence of a catalyst system comprising(A) a solid catalyst component obtained by steps of(i) reducing titanium tetrachloride with an organoaluminum compound represented by the general formula R.sup.1.sub.n AlY.sub.3-n, wherein R.sup.1 represents a C.sub.1 -C.sub.18 hydrocarbon group, Y represents a halogen, and n represents a number satisfying 1<n<3,(ii) heating the reduction product at a temperature of up to 150.degree. C.,(iii) treating the thus obtained solid product containing .gamma.-titanium trichloride by preliminary polymerization of an .alpha.-olefin in the presence thereof, and(iv) reacting the resulting solid product with a halogen represented by the general formula X.sub.

Abstract: A titanium halide containing catalyst component for polymerization of olefins which is prepared by reacting a magnesium hydrocarbyloxide with a silicon compound having at least one hydrogen-silicon bond, contacting the reaction product with an electron donor compound, contacting the resulting contact product two or more times with a titanium halide and between one of the multiple titanium halide contacts, contacting the titanium halide contacted solid with a halide of an element selected from the group consisting of elements of Groups IIIa, IVa, and Va of the Periodic Table of elements.

Abstract: A catalyst component for the polymerization of olefins and particularly ethylene which is prepared by contacting a contact product of a magnesium alkoxide, a halogenated hydrocarbon, a halogenated silane with a titanium compound. The catalyst component in combination with a organoaluminum cocatalyst is useful for the polymerization of ethylene having a high melt index.

Abstract: A preactivated catalyst for producing .alpha.-olefin polymers is provided, which is obtained by the steps which comprises:reacting an organoaluminum compound (O-Al.sub.1) with an electron donor (ED.sub.1) to obtain a reaction product (I);reacting (I) with TiCl.sub.4 to obtain a solid product (II);reacting (II) with an electron donor (ED.sub.2) and an electron acceptor to obtain a solid product (III);combining (III) with an organoaluminum compound (O-Al.sub.2) and a reaction product (RP) of an organoaluminum (O-Al.sub.3) with an electron donor (ED.sub.3) (III), (O-Al.sub.2) and (PP) being referred to as catalyst components), and in this combination, subjecting a part or the whole of the catalyst components to polymerization treatment with an .alpha.-olefin at least in the presence of (III) and said (O-Al.sub.2) to obtain a preliminarily activated catalyst; andpolymerizing an .alpha.-olefin in the presence of the catalyst.

Abstract: A method for the production of a solid titanium trichloride catalyst by the steps of preparing a titanium trichloride composition comprising a solid reduction product obtained by reducing titanium tetrachloride with an organoaluminum compound represented by the formula, R.sup.1.sub.n AlY.sub.3-n (wherein R.sup.1 is a hydrocarbon group having 1 to 18 carbon atoms; Y is a halogen atom or a hydrogen atom; and n is a number satisfying the equation, 1<n.ltoreq.3), or a solid product obtained by thermally treating said solid reduction product at a temperature of not more than 150.degree. C.; reacting said titanium trichloride composition in an aromatic hydrocarbon solvent with a mixture consisting of a halogen compound represented by the formula, X.sub.2 (wherein X is Cl, Br, or I), or an interhalogen compound represented by the formula, XX'.sub.a (wherein X and X' are each Cl, Br, or I, and a is 1 or 3), and an ether compound represented by the formula, R.sup.2 --O--R.sup.3 (wherein R.sup.2 and R.sup.

Abstract: An ethylene polymerization catalyst comprising a supported precursor of vanadium trihalide/electron donor complex and alkylaluminum or boron halides, when combined with alkylaluminum cocatalyst and alkyl halide promoter provides enhanced polymerization and productivity plus superior polyethylene.

Abstract: A catalytic component for polymerization of an .alpha.-olefin is prepared through a process wherein a solid product obtained by allowing an organo-magnesium compound or a mixture of an organo-magnesium compound and an organo-aluminum compound or their reaction product to react, in the presence of an electron donor and an .alpha.-olefin, with a mixture of a halogenating agent other than a halogenated titanium compound and a titanium compound or their reaction product is treated with an alcohol and/or a phenol. The treated product may be further treated with a halogenated titanium compound. Homo- or co-polymerization of an .alpha.-olefin is carried out in the presence of a catalyst composition consisting of the catalytic component and an organo-aluminum compound or with a concomitant electron donor used together with the catalyst composition.

Abstract: An .alpha.-olefin polymerizing catalytic component is obtained by treating, with alcohol and/or phenol, a solid product obtained by allowing an organo-magnesium compound expressed by a generic formula of R'MgX' (wherein R' represents a hydro-carbon group having 1 to 20 carbon atoms and X' a halogen atom selected from the group consisting of chlorine, bromine and iodine or a hydrocarbon group having 1 to 20 carbon atoms) to react with a halogenating agent in the presence of an electron donor; by treating the treated matter with a halogen-containing titanium compound, either after heating under reduced pressure or without such heating; and by treating the product further with a mixture or a complex consisting of an organo-aluminum compound, an organic acid ester and a poly-siloxane. Homo- or co-polymerization of an .alpha.-olefin is carried out in the presence of a catalyst system comprising the catalytic component and an organo-aluminum compound.

Abstract: A Ziegler type supported catalytic component for polymerization of an .alpha.-olefin is prepared by allowing an organo-magnesium compound expressed by a generic formula of R'MgX' (wherein R' represents a hydrocarbon group having 1 to 20 carbon atoms and X' either a halogen atom chosen out of chlorine, bromine and iodine or a hydrocarbon group having 1 to 20 carbon atoms) to react wtih carbon tetrahalide in the presence of an electron donor compound to obtain a solid product through a solid-liquid separation process; by heat treating the separated solid product with a carbon halide; by treating the heat treated solid product with phenols at 90.degree. to 180.degree. C.; and by treating this phenol treated product further with a halogenated titanium compound. Homo- or co-polymerization of an .alpha.-olefin is carried out in the presence or a catalyst composition consisting of the above catalytic component and an organo-aluminum compound. With this catalytic component, stereospecific polymerization of an .alpha.