Abstract: A solid component of a catalyst for the (co)polymerization of ethylene is composed of a silica carrier and a catalytically active part which includes titanium, magnesium, chlorine and also alkoxy groups, and is obtained: by suspending an activated silica in an ethanolic solution of magnesium chloride; by contact of the suspension with an alkoxy or halogen alkoxyde of titanium and with a silicon halide; by eliminating the ethanol from the resulting suspension in order to recover a solid matter; and by making this solid react with an aluminum alkyl chloride.

Abstract: A polymerization catalyst system is formed by combining an organometal compound and a transition metal compound to produce a catalyst A; and combining catalyst A and a catalyst B comprising a rare earth complex having a formula Cp.sub.n MX.sub.4-n.M'L.sub.x, wherein Cp is cyclopentadienyl or cyclopentadienyl substituted with an alkyl or alkyl silyl radical, M is yttrium, scandium or a rare earth metal having an atomic number in the range of 57 to 71, M' is an alkali metal, L is a suitable electron donor ligand, X is a halogen, n is 1 or 2, and x is a number corresponding to the value needed to form a stable complex.Optionally catalyst A is contacted with a rare earth metal halide.Optionally catalyst B is contacted with an alkali or alkaline earth metal alkyl.Optionally a hydrocarbyl aluminum compound can be contacted with catalyst B or with the catalyst system.

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: An olefin polymerization catalyst is prepared from titanium tetrachloride and an organolithium compound wherein the gram atom ratio of lithium to titanium is in the range of about 20/1 to about 50/1 or from a rare earth metal halide, an organolithium compound and a transition metal compound selected from dicyclopentadienyl zirconium dichloride and TiX4 wherein each X is individually selected from halogen, alkyl, alkoxy and aryl radicals.

Abstract: A multiple site solid catalyst component capable of producing polyolefins having a broad or multimodal molecular weight distribution, such as a bi-modal molecular weight distribution, is prepared by contacting a particulate solid support with a zirconium compound or complex to bind the zirconium compound or complex to the support, optionally followed by contacting the supported zirconium compound or complex with a Lewis acid to produce an intermediate product, optionally isolating and washing the supported zirconium compound or complex or resulting intermediate product to remove soluble by-products therefrom, and reacting the washed or unwashed supported zirconium compound or complex or intermediate product with a titanium or vanadium compound to produce a solid catalyst component.

Abstract: In accordance with the present invention, there are provided carrier-supported titanium catalyst components containing magnesium, aluminum, halogen and titanium as essential ingredients, which are obtained by a reaction of[I] a magnesium containing support obtained by previously bringing a support into contact with an organometallic compound of a metal of the Group II to IIIA of the periodic table having at least one hydrocarbon group attached directly to the metal atom or with a halogen containing compound, followed by contact with a magnesium compound in the liquid state having no reducing ability,[II] a reducing organometallic compound, and[III] a titanium compound in the liquid state, and processes for preparing the same and, at the same time, catalysts containing the above-mentioned catalyst components for use in preparing ethylene polymer and processes for preparing ethylene polymer using the catalyst for use in preparing ethylene polymer.

Abstract: The present disclosure is directed to a catalyst comprising the reaction product of:(a) a silicon-containing compound having the structural formula R.sub.4--n SiX.sub.n --where R is C.sub.1 -C.sub.10 hydrocarbyl; X is halogen; and n is an integer of 1 to 4;(b) a magnesiumdialkyl having the structural formula R.sup.1 R.sup.2 Mg, where R.sup.1 and R.sup.2 are the same or different and are C.sub.2 -C.sub.10 alkyl;(c) an alcohol having the structural formula R.sup.3 OH, where R.sup.3 is C.sub.1 -C.sub.10 hydrocarbyl;(d) a halide-containing metal compound, said metal selected from the group consisting of titanium, zirconium and vanadium;(e) an aluminum alkoxide having the structural formual Al(OR.sup.5).sub.3, where R.sup.5 is C.sub.2 -C.sub.

Abstract: A polymerization catalyst is formed by combining a metal halide compound, a solvent, an effective amount of water to reduce fines and increase particle size, and a transition metal compound to form a first catalyst component and mixing the first catalyst component with a precipitating agent. After mixing the first catalyst component and the precipitating agent, the mixture can be heated to a temperature higher than the mixing temperature to reduce polymer fines. In the alternative prepolymer can be deposited on the catalyst(s) in an amount effective to reduce polymer fines. Optionally the catalyst can be treated with a halide ion exchanging source. The catalyst can also be combined with an organometallic cocatalyst.

Abstract: A catalytic component having controlled strucuture for use in combination with a cocatalyst for the polymerization of ethylene, and being the product of the process of subjecting a component consisting essentially of titanium, magnesium, and chlorine to a reduction treatment and after such treatment contacting the component with a transition metal chlorine-containing compound and process of polymerizing ethylene using such catalytic component to produce polymers having a broad molecular weight distribution.

Abstract: In accordance with the present invention, there are provided olefin polymerization catalysts comprising[A] a titanium catalyst component containing titanium, magnesium and halogen as its essential ingredients,[B-1] a transition metal compound containing a ligand having a cycloalkadienyl skeleton,[C] an organoaluminum oxy-compound and, if necessary,[D] an organoaluminum compound.Further, in accordance with the invention, there are provided olefin polymerization catalysts comprising[A] a titanium catalyst component containing titanium, magnesium and halogen as its essential ingredients,[B-2] a transition metal compound containing a ligand having a cycloalkadienyl skeleton and an anion compound containing boron, and[C] an organoaluminum compound and/or an organoaluminum oxy-compound.

Abstract: A transition-metal catalyst component for a Ziegler catalyst system, obtainable by1) mixing, in a solvent, an inorganic, oxidic carrier with1.1) a vanadium trihalide/alcohol complex of the formula VY.sub.3 nZ-OH, whereY is chlorine or bromine,N is from 1 to 6, andZ is a monovalent, saturated, aliphatic or araliphatic hydrocarbon radical having not more than 10 carbon atoms, and1.2) a titanium trihalide or a titanium trihalide/aluminum trihalide complex, where the halogen can be chlorine and/or bromine, or a titanium trihalide complex of the formula TiY.sub.3. nZ-OH or a mixture thereof, whereY is chlorine or bromine,n is from 1 to 6, andZ is a monovalent, saturated, aliphatic or araliphatic hydrocarbon radical having not more than 10 carbon atoms or a mixture thereof, and1.3) a zirconium tetrahalide, where the halogen can be chlorine and/or bromine,2) removing the solvent by evaporation,3) mixing the solid-phase intermediate from step (2) with3.1) an organoaluminum catalyst component of the formula AlR.sub.

Abstract: A transition-metal catalyst component for a Ziegler catalyst system, obtainable by1) mixing, in a solvent, an inorganic, oxidic carrier with1.1) a vanadium trihalide alcohol complex of the formula VY.sub.3.nZ--OH, whereY is chlorine or bromine,n is from 1 to 6, andZ is a monovalent, saturated, aliphatic, aromatic or araliphatic hydrocarbon radical having not more than 10 carbon atoms, and1.2) a titanium halide or a titanium trihalide/aluminum trihalide complex, where the halogen can be chlorine and/or bromine, or a titanium trihalide complex of the formula TiY.sub.3.nZ--OH or mixtures thereof, whereY is chlorine or bromine,n is from 1 to 6, andZ is a monovalent, saturated, aliphatic, aromatic or araliphatic hydrocarbon radical having not more than 10 carbon atoms, and1.3) a compound of the formula BX.sub.n Y.sub.m R.sub.p or SiX.sub.n Y.sub.m R.sub.q or mixtures thereof, whereX is OR,Y is chlorine, bromine or hydrogen, andR is a C.sub.1 - to C.sub.

Abstract: The present invention relates to a catalyst and a process for preparing a catalyst suitable for polymerization of olefins. The process is carried out in a hydrocarbon liquid medium and comprises successively contacting a refractory oxide support with (a) a dialkylmagnesium optionally with a trialkylaluminium, (b) a particular monochloro organic compound, (c) a titanium and/or vanadium compound(s), and then (d) with ethylene optionally mixed with a C.sub.3 -C.sub.8 alpha-olefin in the presence of an organo-aluminium or organozinc compound to form a prepolymerized catalyst. The catalyst has a high activity, particularly in a gas phase polymerization of ethylene, and has a great ability of copolymerizing alpha-olefins with ethylene.

Abstract: A catalyst component for olefin polymerization composed of a solid component (IV) and capable of affording a supported type catalyst composed of large particles and having a sharp particle size distribution is provided,which solid component (IV) is obtained bystep A of reacting an organic Mg compound of a specified formula with a 1-20C saturated or unsaturated mono- or polyhydric alcohol C in the presence of CO.sub.

Abstract: In accordance with the present invention, there are provided olefin polymerization solid catalysts comprising[A] a solid titanium catalyst component containing titanium, magnesium and halogen as its essential ingredients, said catalyst component having supported thereon[B] a transition metal compound containing a ligand having a cycloalkadienyl skeleton and, if necessary,[C] an organoaluminum oxy-compound.In accordance with the invention, there are also provided olefin polymerization solid catalysts comprising[i] a solid containing a transition metal compound containing a ligand having a cycloalkadienyl skeleton, said solid having supported thereon[ii] a titanium catalyst component containing titanium, magnesium and halogen as its essential ingredients and, if necessary,[iii] an organoaluminum oxy-compound.

Abstract: Supported olefin, e.g., alpha-olefin, polymerization catalyst compositions, such as Ziegler-Natta catalysts, are modified by using porous, polymer particles having an average pore diameter of at least about 10 .ANG. as the catalyst support. The resulting catalyst composition is more active than refractory oxide-supported catalysts and it is not susceptible to deactivation by catalyst poisons, such as oxygen or water. Additionally, the polymer particles need not be calcined prior to the catalyst synthesis.

Abstract: The method of forming a catalytic component for use in the polymerization of ethylene or a copolymer of ethylene and a C.sub.3 to C.sub.12 alpha olefin in a gas-phase comprising impregnating a porous metal oxide support with at least one titanium compound, magnesium compound, and chlorine compound, and prepolymerizing ethylene or a copolymer of ethylene and a C.sub.3 to C.sub.12 alpha olefin, a least partially in suspension, in the presence of said porous metal oxide support and at least one alkylaluminum compound until a degree of prepolymerization is reached which is suitable for the subsequent gas-phase of fluidized bed polymerization, and the method of polymerizing olefins utilizing the catalysts formed by the prepolymerization.

Abstract: High activity olefin polymerization catalysts based on organolithium compounds and transition metal compounds are disclosed. In one catalyst system an organolithium compound is employed in combination with titanium tetrachloride and the Li/Ti ratio is in the range of about 20 to about 50. In another catalyst system the organo lithium compound is combined with a rare earth metal halide. For best results these catalyst systems are employed at pressures of at least about 100 psi. In ethylene polymerization an ethylene partial pressure of at least about 100 psi is preferred.

Abstract: The present invention relates to a process for preparing a Ziegler-Natta type catalyst based on vanadium and titanium. The process comprises (1) contacting within a liquid hydrocarbon a spheroidal support comprising (i) MgCl.sub.2 free from any Mg-C bond and (ii) an electron-donor (D1) free from labile hydrogen, successively with an electron-donor (D2) containing labile hydrogen and then with an organometallic compound capable of reducing vanadium and titanium compounds, (2) washing of the solid product with a liquid hydrocarbon and (3) then contacting the washed solid product with a vanadium compound and a titanium compound, both being soluble in the liquid hydrocarbon. The catalyst consists of spheroidal particles without fines, is very active in olefin polymerization and is particularly suitable for producing elastomeric copolymers of propylene.

Abstract: Olefinic polymer exhibiting high environmental stress crack resistance are produced by contacting the olefin charge stock in a single reactor with a compatible mix of two transition metal catalyst systems. One component of the catalyst system comprises chromium oxide supported on an aluminophosphate material. Hydrogen can be used as adjuvant for the hexavalent chromium component of the catalyst mixture. The second catalyst component consists essentially of a beta-stabilized tetrahydrocarbyl zirconium compound supported on inorganic support material. The catalysts can be premixed before use in the reactor, or can be added to the reactor separately. A suitable cocatalyst can be utilized.

Abstract: A catalyst useful in the polymerization of olefins is disclosed. The catalyst is produced by initially treating an inert inorganic compound to remove surface hydroxy groups. The thus treated inorganic compound is contacted with a hydrocarbon soluble magnesium compound in a second step. The product of this second step is contacted with a modifying compound selected from the group consisting of silicon halides, boron halides, aluminum halides, alkyl silicon halides, hexaalkyl disilazanes and mixtures thereof in a third step. The product of this third step is contacted a vanadium compound having the structured formula V(O).sub.s X.sup.1.sub.4-s, where X.sup.1 is halogen; and s is 0 or 1, a first titanium-containing compound having the structural formula Ti(OR.sup.2).sub.n X.sup.2 m, where R.sup.2 is hydrocarbyl; X.sup.

Abstract: A supported catalyst for polymerizing 1-olefins, for example, ethylene, is prepared by depositing a chromium compound and a titanium compound on a refractory oxide support which is substantially non-spherical, and which has a relatively broad particle size distribution range. The catalyst is preferably combined, either outside of the polymerization vessel or in situ, with a sufficient amount of at least one magnesium composition of the formula RMgR', where R and R' are the same or different and they are C.sub.1 to C.sub.12 hydrocarbyl groups, to provide a molar ratio of magnesium to chromium in the catalyst composition of about 0.01:1 to about 25:1. The resulting catalyst composition has good feedability and fluidization characteristics, and it produces resins of relatively high HLMI at relatively low temperatures.

Abstract: Silica supported high activity olefin polymerization catalysts, methods of producing the catalysts and methods of using the catalysts in the polymerization of olefins are provided. The methods of producing the catalysts each basically comprise contacting a particulate silica support impregnated with tungsten oxide with the soluble complex produced by heating a mixture of a metal dihalide with a transition metal compound to produce a solid, and then reacting the solid with an organoaluminum halide. The catalysts produced have improved productivities and are less soluble in polymerization media.

Abstract: A catalyst for use in polymerization of olefins which comprises a carrier mainly composed of a magnesium compound precipitated from a solution and a catalytic component supported on the carrier and selected from titanium halides, vanadyl halides and vanadium halides is described. The catalyst is obtained by a process which comprises: (A) mixing (a) at least one magnesium compound with (c) a saturated or unsaturated monohydric or polyhydric alcohol for reaction in dissolved state in the presence of (b) carbon dioxide in an inert hydrocarbon solvent to obtain component (A); (B) subjecting the component (A) to mixing and reaction with (d) a titanium and/or a vanadyl halide and/or a vanadium halide of the general formula, VX.sub.r (OR.sup.8).sub.4-r, and also with (e) at least one boron compound, Si compound and/or Siloxane compound thereby obtaining solid product (I); (C) reacting the solid product (I) with (f) a cyclic ether with or without R.sup.

Abstract: A process as disclosed for improving the particle size of a olefin polymerization catalyst. The process involves combining the catalyst with an alkoxide-containing liquid comprising a transition metal alkoxide and an aluminum alkyl, causing said alkoxide and said aluminum alkyl to react for form a precipitate and then recovering the resulting solid. Also disclosed are the catalysts produced by such a process and the use of such catalysts in the polymerization of olefins.

Abstract: An olefin polymerization supported catalyst comprising the supported reaction product of at least one metallocene of a metal of Group IVB, VB, and VIB of the Periodic Table, a non-metallocene transition metal containing compound of a Group IBV, VB, or VIB metal and an alumoxane, said reaction product formed in the presence of the support. The supported product is highly useful for the polymerization of olefins especially ethylene and especially for the copolymerization of ethylene and other mono and diolefins.

Abstract: There is disclosed a catalyst composition for the polymerization of olefins, particularly alpha-olefins. The composition is prepared by synthesizing a catalyst precursor and then combining it with a conventional catalyst activator. The precursor is synthesized by: (a) contacting a solid, porous carrier with an aluminum compound; (b) contacting the resulting product with a mixture of vanadium and titanium compounds; (c) contacting the product with an alkyl ether and (d) pre-activating the product of step (c) with a mixture of a halogenating agent and an aluminum compound.The catalyst composition is used without a halogenating agent in the polymerization medium to produce narrow molecular weight distribution HDPE and LLDPE products, or with a halogenating agent in the polymerization medium to produce broad molecular weight distribution LLDPE and HDPE products.

Abstract: Ethylene homopolymers and ethylene copolymers with alpha-(C.sub.3 -C.sub.10)-olefins are obtained by polymerizing the monomers with a polymerization catalyst formed by:a) an alkyl-aluminum; andb) a modified solid catalyst component obtained by treating with a Lewis' base a non-modified solid component to be defined by means of the following formula, expressed as atomic proportions:Ti(1), hf(0.5-3), Si (1-6), Mg (0.5-15) Al (0.5-15),X (20-60, ROH (1-10)wherein:X represents either chlorine and bromine, andR represents either a linear or branched alkyl radical of from 1 to 6 carbon atoms.The catalyst is particularly useful for controlling the molecular weight and the molecular weight distribution of ethylene hompolymers and copolymers.

Abstract: A supported, electron donor-complexed reduced vanadium.sup.(<3) /zirconium coimpregnated catalyst possessing enhanced activity, the methods of its manufacture and ethylene polymers of broad molecular weight distribution produced therewith.

Abstract: A process for producing a polyolefin having a multimodal molecular weight distribution wherein the polymerization is conducted in the presence of hydrogen and a catalyst system containing aluminoxane and at least two different metallocenes each having different olefin polymerization termination rate constants in the presence of hydrogen, and the process of producing the catalyst system.

Abstract: The present invention relates to a process for preparing a Ziegler-Natta type catalyst based on vanadium and titanium compounds precipitated on a MgCl.sub.2 spherical support. The catalyst preparation consists of contacting within a liquid hydrocarbon a vanadium- and titanium-reducing agent chosen from organometallic compounds with a vanadium compound and a titanium compound, both soluble in the liquid hydrocarbon, in a molar ratio V/Ti from 70/30 to 99.5/0.5 and a support containing (i) MgCl.sub.2 free from Mg-C bond and (ii) an organic electron donor compound free from labile hydrogen. The support consists of spherical particles having a well-defined diameter and a narrow particle size distribution. The catalyst is particularly suitable for manufacturing in a gas phase process elastomeric copolymers of propylene.

Abstract: The invention is a supported catalyst system including an inert support material, a Group IV B transition metal component and an alumoxane component which may be employed to polymerize olefins to produce a high molecular weight polymer.

Abstract: A catalyst useful in the polymerization of olefins is disclosed. The catalyst is produced by initially treating an inert inorganic compound to remove surface hydroxy groups. The thus treated inorganic compound is contacted with a hydrocarbon soluble magnesium compound in a second step. The product of this second step is contacted with a modifying compound selected from the group consisting of silicon halides, boron halides, aluminum halides, alkyl silicon halides, hexaalkyl disilazanes and mixtures thereof in a third step. The product of this third step is contacted a vanadium compound having the structured formula V(O).sub.s X.sup.1.sub.4-s, where X.sup.1 is halogen; and s is 0 or 1, a first titanium-containing compound having the structural formula Ti(OR.sup.2).sub.n X.sup.2.sub.m, where R.sup.2 is hydrocarbyl; X.sup.

Abstract: Broad molecular weight distribution, and high molecular weight olefin polymers, are prepared by polymerizing at least one olefin in the presence of a vanadium--and a titanium-containing catalyst composition. A catalyst precursor is synthesized by contacting a solid, porous carrier sequentially with a metal or a compound of a metal of Group IIB of the Periodic Chart of the Elements, e.g., a zinc compound, a halogen-containing aluminum compound, a vanadium compound and a titanium compound. The precursor is then combined with a suitable co-catalyst and a halogenating agent to produce the catalyst composition used to polymerize olefins.

Abstract: There is disclosed a supported olefin polymerization catalyst composition comprising a precursor and a catalyst activator. The precursor comprises a magnesium compound, e.g., dibutylmagnesium, a cyclopentadienyl group-containing zirconium compound, and a titanium and/or a vanadium compound, e.g., TiCl.sub.4, and an organic compound, e.g., an alcohol. The catalyst activator is a mixture of a conventional Ziegler/Natta co-catalyst and a zirconium sites activator, e.g., methylaluminumoxane. The catalyst is used in the presence of small amounts of hydrogen to produce polymers having multimodal molecular weight distribution in a single reactor.

Abstract: Ziegler polymerization of .alpha.-olefins is disclosed which is characterized by a solid catalyst component used in the Ziegler-type catalyst. The solid catalyst component, Component (A), comprises Component (i) which is a solid catalyst component for a Ziegler-type catalyst comprising Ti, Mg and a halogen; Component (ii) a silicon compound of a formula:R.sup.1 R.sup.2.sub.3-n Si(OR.sup.3).sub.nwherein R.sup.1 -R.sup.3 are each hydrocarbyl group characterized by R.sup.1 which has a branched hydrocarbyl group;Component (iii) a halogen compound of W or Mo; and Component (iv) an organometal compound of a metal of Groups I to IV of the Periodic Table.

Abstract: Olefinic polymer exhibiting high environmental stress crack resistance are produced by contacting the olefin charge stock in a single reactor with a compatible mix of two transition metal catalyst systems. One component of the catalyst system comprises chromium oxide supported on an aluminophosphate material. Hydrogen can be used as adjuvant for the hexavalent chromium component of the catalyst mixture. The second catalyst component consists essentially of a beta-stabilized tetrahydrocarbyl zirconium compound supported on inorganic support material. The catalysts can be premixed before use in the reactor, or can be added to the reactor separately. A suitable cocatalyst can be utilized.

Abstract: High activity olefin polymerization catalysts based on organolithium compounds and transition metal compounds are disclosed. In one catalyst system an organolithium compound is employed in combination with titanium tetrachloride and the Li/Ti ratio is in the range of about 20 to about 50. In another catalyst system the organo lithium compound is combined with a rare earth metal halide. For best results these catalyst systems are employed at pressures of at least about 100 psi. In ethylene polymerization an ethylene partial pressure of at least about 100 psi is preferred.

Abstract: A method for the preparation of biaryl compounds is disclosed which comprises contacting an aryl halide with a tertiary-alkyl organometallic reagent (or the precursor components thereof) in the presence of a catalyst comprising a nickel compound and a coordinating ligand under conditions suitable for the formation of biaryl compound.In an alternate embodiment of the present invention, nickel(O) compounds are prepared from nickel(II) compounds by contacting a nickel(II) compound with a combination of an organophosphine and a bidentate nitrogen-containing coordinating ligand, and a tertiary-alkyl organometallic reagent (or the precursor components thereof) in an aprotic, non-polar, ether-containing solvent system for a time and under conditions suitable for the formation of nickel(0) compound.

Abstract: Catalyst system, suitable for the (co)polymerization of ethylene and optionally minor amounts of 1-alkenes and/or dienes at a temperature of at least 180.degree. C., to be prepared by combining at least two components A and B, which components comprise:A: one or more titanium compounds, one or more vanadium compounds, one or more aluminium compounds, one or more magnesium compounds and optionally one or more halogen compounds, in such amounts that the atomic ratio of magnesium to the sum of titanium and vanadium is between 0 and 10, the atomic ratio of aluminium to the sum of titanium and vanadium is at least 3, the atomic ratio of aluminium to magnesium is at least 1, and the atomic ratio of halogen to magnesium is at least 2,B: one or more organoaluminium compounds, which two components are, separately or in combination, supplied direct to the polymerization vessel.

Abstract: A process for the preparation of a solid catalyst of the Ziegler-Natta type comprises precipitating the solid catalyst in a liquid hydrocarbon medium by reacting (A) a solution of a soluble magnesium alkoxide and (B) a transition metal halide which is a halide of Ti (IV), a halide of V (IV) or a halide of VO (III) in the presence of (C) at least one transition metal alkoxide which is free from halogen and soluble in liquid hydrocarbon. The precipitated solid catalyst consists of spheroidal particles having a mean diameter by mass of from 10 to 70 microns and a narrow particle size distribution such that the ratio of mean diameter by mass to the mean diameter by number is greater than 1.2 and smaller than 2.0.

Abstract: There is disclosed a catalyst composition for the polymerization of olefins, particularly alpha-olefins. The composition is prepared by synthesizing a catalyst precursor and then combining it with a conventional catalyst activator. The precursor is synthesized by: (a) contacting a solid, porous carrier with an aluminum compound; (b) contacting the resulting product with a mixture of vanadium and titanium compounds; and, (c) contacting the product with an ether.The catalyst composition is used with a conventional activator and, preferably, a halogenating agent in the polymerization medium to produce broad molecular weight distribution, high molecular weight HDPE or medium density, broad molecular weight distribution, high molecular weight resins which can be made into high strength films.

Abstract: The present invention disclosure is directed to a catalyst comprising the reaction product of:(a) a silicon-containing compound having the structural formula R.sub.n-4 SiX.sub.n, where R is C.sub.1 -C.sub.10 hydrocarbyl; X is halogen; and n is an integer of 1 to 4;(b) a magnesiumdialkyl having the structural formula R.sup.1 R.sup.2 Mg, where R.sup.1 and R.sup.2 are the same or different and are C.sub.2 -C.sub.10 alkyl;(c) an alcohol having the structural formula R.sup.3 OH, where R.sup.3 is C.sub.1 -C.sub.10 hydrocarbyl;(d) a halide-containing metal compound, said metal selected from the group consisting of titanium, zirconium and vanadium;(e) an aluminum alkoxide having the structural formula A1(OR.sup.5).sub.3, where R.sup.5 is C.sub.2 -C.sub.

Abstract: A solid catalyst component for the polymerization of ethylene and the copolymerization of ethylene with C.sub.3 -C.sub.10 alpha-olefins, contains titanium, vanadium and chlorine, is substantially definable by the formula (in atomic proportions):V (1), Ti (n), Cl (4n)where n varies from 1 to 3, and is prepared by reacting titanium tetrachloride with a vanadium arene [V.degree.(arene).sub.2 ] (arene=benzene or mono-, di- or tri-alkyl substituted benzene) in accordance with the equation:V.degree.(arene).sub.2 +nTiCl.sub.4 .fwdarw.VTi.sub.n Cl.sub.4n +2 arenepossibly followed by treatment with an alkyl aluminum chloride. This catalyst component, when associated with a trialkyl aluminium, is highly active in the production of ethylene polymers and copolymers by low temperature, low pressure methods in suspension, or by high temperature, high pressure methods conducted in a tubular reactor or pressure vessel, or by high temperature methods conducted in solution.

Abstract: A catalyst system comprising:(i) a catalyst precursor, which includes: magnesium; titanium; a halogen, which is chlorine, bromine, or iodine, or a mixture thereof; one or two inside electron donors; and a cerium (IV) compound;(ii) a hydrocarbylaluminum cocatalyst; and(iii) a selectivity control agent wherein the atomic ratio of aluminum to titanium is in the range of about 5 to about 300 and the molar ratio of aluminum to selectivity control agent is in the range of about 0.1 to about 100.

Abstract: The invention provides catalyst systems for use in the polymerization of olefins to produce a polymer product having a broad molecular weight distribution. The catalyst system includes at least two different chiral, stereo-rigid metallocene catalysts of the formula R"(C.sub.5 (R').sub.4).sub.2 MeQp and an aluminum compound, preferably an alumoxane. These catalyst systems are especially useful in the polymerization of propylene.

Abstract: There is disclosed a catalyst composition for the polymerization of olefins, particularly alpha-olefins. The composition is prepared by synthesizing a catalyst precursor and then combining it with a conventional catalyst activator. The precursor is synthesized by: (a) contacting a solid, porous carrier with an aluminum compound; (b) contacting the resulting product with a mixture of vanadium and titanium compounds; (c) contacting the product with an alkyl ether and, (d) pre-activating the product of step (c) with a mixture of a halogenating agent and an aluminum compound.The catalyst composition is used without a halogenating agent in the polymerization medium to produce narrow molecular weight distribution HDPE and LLDPE products, or with a halogenating agent in the polymerization medium to produce broad molecular weight distribution LLDPE and HDPE products.

Abstract: Ziegler-Natta catalysts for polymerizing .alpha.-olefins are prepared by the addition of tetrakis(dialkylaminde or diarylamide) derivatives of titanium, and a metal-containing reducing agent such as ethyl aluminum dichloride to a suitable support material such as magnesium chloride. Olefins are polymerized in the presence of these supported catalysts and an aluminum containing cocatalyst or activator such as triethylaluminum.

Abstract: A finely divided aluminoxane comprising an aluminoxane represented by formula [I] or [II] ##STR1## wherein R denotes a hydrocarbon group having 1 to 10 carbon atoms and m denotes an integer of 2 to 50,an average particle size being 5 to 200 .mu.m and a specific an average particle size being 5 to 200 .mu.m and a specific surface area being 20 to 1000 m.sup.2 /g, a process for producing same, and a catalyst component for polymerization of olefins being said finely divided aluminoxane.

Abstract: A method is provided for making alkylhalosilanes by effecting reaction between an alkyl halide, such as methyl chloride and powdered silicon in the presence of a copper-zinc-tin catalyst. Significant improvements in reaction rate and product selectivity are achieved when copper is employed at a critical weight percent relative to silicon and critical weight ratios of tin and zinc are employed relative to copper.