Abstract: In accordance with this invention, there is provided a living carbocationic polymerization catalyst system comprising: (1) a halide of titanium, tin, vanadium or antimony; (2) an aluminum halide selected from the group consisting of aralkyl aluminum halides and alkyl aluminum halides; and (3) an initiator selected from the group consisting of tertiary alkyl halides, tertiary aralkyl halides, tertiary polymeric halides, and water provided that if the initiator is organic, a proton scavenger is present, or, alternatively, if the initiator consists of water, a secondary or tertiary amine is present. Another aspect of the invention comprises a process for using this catalyst system for the polymerization of olefins and for producing narrow molecular weight distribution polymers in a short reaction time.

Abstract: Process for the preparation of a catalytic composition for the polymerization of olefins. At least partial electrochemical oxidation of aluminum in a solvent of .alpha.,.omega.-dihalogeno-alkane and simultaneously the electrochemical reduction of a compound of titanium (IV) occur in process.The catalytic composition comprises at least one titanium compound, at least one halogenated organo-aluminum compound and at least one inorganic magnesium compound in suspension in at least one .alpha.,.omega.-dihalogeno-alkane. The titanium compound is essentially a titanium (III) compound. The overall content of titanium (II) and titanium (IV) is less than or equal to 15% of the total titanium content.

Abstract: The process comprises, in a first step, the reduction of a titanium (IV) compound in an .alpha.,.omega.-dihalogenoalkane using a molar excess of at least one halogenated organoaluminium compound in the absence of an ether, and then in a second step, the addition of a reaction mixture of a compound capable of forming a magnesium halide in-situ, without additional reduction of the titanium compound obtained in the first step. The catalyst contains at least one titanium compound, at least one halogenated organoaluminium compound and at least one inorganic magnesium compound in suspension in at least one .alpha.,.omega.-dihalogenoalkane; the titanium cmpound is essentially a titanium (III) compound, the total titanium (II) and titanium (IV) content being less than or equal 15% to the total titanium content. It may also contain at least one vanadium compound, an inert solvent, at least one partially polymerized .alpha.

Abstract: A solid component of catalyst for the (co)polymerization of ethylene, including magnesium, halogen and titanium, is prepared:(i) by dissolving a magnesium dialkyl, a silicon halide and at times also an alkyl halide, in an inert organic solvent and maintaining contact until a granular solid precipitates;(ii) putting this granular solid in contact and making it react with a titanium halide, alkoxide or halogen-alkoxide, to produce a solid component of catalyst; and(iii) activating this solid component of catalyst by contact with aluminium alkyl halide, if a titanium alkoxide or halogen-alkoxide has been used in phase (ii).

Abstract: A solid catalyst component for alkene polymerization comprising a magnesium halide, an electron donor and a phenoxy-titanium halide, the latter being a dihalophenoxy-titanium halide or a dialkoxyphenoxy-titanium halide in which the alkoxy groups each have from 1 to 8 carbon atoms.

Abstract: A vanadium-containing catalyst is prepared as the product of admixing an inorganic oxide, inorganic phosphate or mixtures thereof, a zinc-containing composition, and a vanadium-containing composition. An auxiliary compound such as, for example, an aluminum halide compound may optionally be admixed. The catalyst may be combined with a co-catalyst such as an aluminum alkyl and, optionally, a halocarbon promotor to yield an olefin polymerization catalyst system. The resulting catalyst system exhibits high activity, excellent hydrogen response and produces a polymer having a narrow to broad molecular weight distribution with a bimodal profile. The catalyst is especially useful in ethylene homopolymerization and co-polymerization.

Abstract: An improved polymerization process for making essentially nonagglomerated ethylene polymers, especially EPR polymers, based on the use of a stage-modified high activity vanadium catalyst, under polymerization conditions that normally would yield an undesirable amount of agglomerated polymer.

Abstract: An improved high activity olefin polymerization catalyst catalyzes the production of polymeric lower .alpha.-olefin having good properties and a relatively narrow particle size distribution. The catalyst is produced from an organoaluminum cocatalyst, a selectivity control agent and a novel olefin polymerization procatalyst which is prepared by contacting a tetravelent titanium halide, a halohydrocarbon, an electron donor and the solid procatalyst precursor obtained by heating an adduct of a carbonated magnesium ethoxide and a phenolic compound of enhanced acidity.

Abstract: A complex alkoxide compound containing magnesium, titanium and boron species comprises the reaction product of elemental magnesium, titanium tetraalkoxide, an alkyl borate ester and alkanol at elevated temperature in an inert diluent. This complex alkoxide compound is contacted with a tetravalent titanium halide, a halohydrocarbon and an electron donor to form an olefin polymerization procatalyst. Contact of the procatalyst with an organoaluminum cocatalyst and a selectivity control agent produces a high activity catalyst for the polymerization of lower .alpha.-olefins to polymer product of good properties in good catalyst productivity.

Abstract: A complex, magnesium-containing, titanium-containing solid olefin polymerization procatalyst precursor is produced by reaction of magnesium alkoxide, titanium tetraalkoxide and a phenolic compound followed by removal of alkanol. Conversion of this solid to an olefin polymerization procatalyst and the procatalyst to an olefin polymerization catalyst results in a catalyst which is used to polymerize lower .alpha.-olefin monomers. The polymer product is obtained in good yield and has good properties including a relatively high bulk density and a relatively narrow particle size distribution.

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: 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 process for preparing an olefin polymerization catalyst which comprises halogenating a magnesium-di-(3-halo- or 3- C.sub.1 to C.sub.8 alkoxy-phenoxide) with a halide of tetravalent titanium in the presence of a halohydrocarbon, recovering the solid reaction product from the reaction mixture and combining the solid reaction product with an organo aluminium compound and an electron donor.

Abstract: This invention provides new supported catalyst compositions for the polymerization of 1-olefins, together with processes for preparing and using the catalysts. The catalyst compositions include two catalyst components. The first catalyst component is formed by reacting a halogen-containing compound of the formula: H.sub.a M.sup.1 X.sup.1.sub.b R.sup.1.sub.(c-b-a) wherein M.sup.1 is boron, carbon, silicon or mixtures thereof; X.sup.1 is Cl, Br or mixtures thereof; R.sup.1 is a hydrocarbyl or alkoxy radical; with a mixture produced by contacting a finely divided porous inorganic oxide support in an inert solvent with a solution made by combining a magnesium dihydrocarbyloxide dissolved in an inert solvent, and of the formula: Mg(OR.sup.2).sub.2 wherein R.sup.2 is a hydrocarbyl radical, with a transition metal hydrocarbyloxide of the formula: M.sup.2 (OR.sup.3).sub.y wherein M.sup.2 is a transition metal from Group IVB, VB, and VIB of the Periodic Table; and R.sup.3 is a hydrocarbyl radical.

Abstract: A vanadium-based catalyst is treated with a polysiloxane oil as a means of enhancing catalyst activity and polymer productivity.

Abstract: A vanadium-based catalyst is treated with certain alkylaluminum alkoxide compounds as a means of narrowing and effectively regulating the molecular weight distribution of the polymers produced with the catalyst.

Abstract: A process for the production of an ethylene homopolymer or copolymer comprising passing ethylene with or without at least one alpha-olefin comonomer having 3 or more carbon atoms into contact with a mixed catalyst system, under polymerization conditions, said mixed catalyst system comprising:(a) the reaction product of (i) a vanadium halide having the formula VX.sub.3 wherein X is chlorine, bromine, or iodine and each X is alike or different; (ii) a modifier having the formula BX.sub.3 or AlR.sub.(3-a) X.sub.a and (iii) an electron donor(b) one of the following:(i) a complex having the formula ZrMg.sub.b X.sub.c (ED).sub.d ; or(ii) a vanadium oxy compound having the formula VOX.sub.3, VOX.sub.2, VOX, or VO.sub.2 X wherein X is as defined above, or VO(OR).sub.3(c) a hydrocarbyl aluminum cocatalyst; and(d) a halocarbon promoter having the formula R.sub.e CX.sub.

Abstract: A vanadium catalyst composition comprising:(i) the reaction product of a vanadium compound and an electron donor, which is a liquid, organic Lewis base in which the vanadium compound is soluble;(ii) a hydrocarbyl aluminum cocatalyst; and(iii) a promoter having the following formula:C.sub.3 (X).sub.a (F).sub.b (H).sub.

Abstract: A process for polymerizing alpha olefins with a polymerization catalyst containing a solid catalyst component which is prepared by mixing two or more alkyl or aryl magnesium compounds with an aldehyde or a ketone in the presence of a solvent, adding a tetravalent titanium halide to the solution, recovering the resulting precipitate, and contacting the precipitate with a tetravalent titanium halide.

Abstract: A solid catalyst component which is prepared by:mixing an alkyl or aryl magnesium compound with a branched or aromatic aldehyde in the presence of a solvent;adding a tetravalent titanium halide to the solution;recovering the resulting precipitate; andcontacting the precipitate with a tetravalent titanium halide.

Abstract: Crystalline magnesium olefin polymerization catalyst components capable of producing polymer with improved activity and morphological properties are disclosed and claimed. In particular, the components are prepared by reacting a crystalline alkoxy magnesium compound with a halide of tetravalent titanium.

Abstract: Olefin polymerization catalyst components having improved activity and morphological properties are disclosed and claimed. In particular, the components are prepared by reacting a carbonized magnesium alkoxide or aryloxide component with a halogenated tetravalent titanium component, a halohydrocarbon component and an electron donor.

Abstract: Olefin polymerization catalyst components having improved activity and morphological properties are disclosed and claimed. In particular, the components are prepared by reacting a magnesium compound of the formula [Mg.sub.4 (OR).sub.6 (R'OH).sub.10 ]X where "X" is a counter ion having a total charge of -2 and R and R', which may be the same or different, are selected from alkyl groups of 1 to 4 carbon atoms, with a halogenated tetravalent titanium component, a halohydrocarbon component and an electron donor.

Abstract: A process for producing a catalyst component for polymerization of olefins which comprises contacting (a) a metal oxide with (b) a magnesium alkoxide, contacting the resulting contact product with (c) a halogen-containing compound, and finally contacting the resulting contact product with (d) a titanium compound.

Abstract: A catalyst component for polymerization of olefins which is prepared by contacting a product obtained by contacting (A) a magnesium alkoxide, (B) a silicon compound having the hydrogen-silicon bond, and (C) a titanium compound with one another, with (D) (a) a hydrocarbon, (b) a halogenated hydrocarbon, and/or (c) a halide of an element selected from the elements of Groups IIIa, IVa, and Va of the Periodic Table.

Abstract: A process for preparing spherical particles of a compound with the general formula Mg(OR).sub.2-a (OR').sub.a is disclosed. In the process R is an alkyl group with from 2 to 8 carbon atoms, R' is an alkyl group with from 1 to 7 carbon atoms and a is a number of from 0 to 0.5. The process comprises preparing a homogeneous solution of a compound Mg(OR).sub.2 in an aliphatic alcohol with the general formula R'OH, spray-drying the solution at a temperature of from 15.degree. to 85.degree. C., suspending the spray-dried solid particles in an aliphatic alcohol with the formula ROH in which R is the same alkyl group as present in the said compound Mg(OR).sub.2, heating the suspension in order to remove an alcohol with the formula R'OH from the liquid phase by distillation and separating the solid particles from the liquid phase.

Abstract: A solid titanium containing catalyst component for use in olefin polymerization said component prepared by contacting a magnesium alkoxide, a halogenated hydrocarbon, an electron donor and a titanium compound with one another. In preferred embodiments, the magnesium alkoxide is first contacted with a magnesium halide. The solid titanium containing compound can be treated with an organoaluminum compound.

Abstract: Composition comprising a transition metal component and magnesium carboxylate prepared by reacting a solution of hydrocarbyl magnesium compound with carbon dioxide to precipitate a magnesium carboxylate and reacting magnesium carboxylate with transition metal component.

Abstract: A vanadium containing catalyst component useful for polymerizing olefins to polyolefins having a high molecular weight and broad molecular weight distribution comprising polymerizing the olefins in the presence of a catalyst comprising (a) a vanadium containing catalyst component obtained by contacting an inert support material with an organoaluminum compound, a halogenating agent and a vanadium compound, and (b) an aluminum alkyl cocatalyst.

Abstract: Catalyst system comprising titanium containing catalyst component, isoprenylaluminum and a halohydrocarbon for the production of polyethylene having a broad molecular weight distribution.

Abstract: An olefin polymerization catalyst prepared by reacting a metal dihalide and a transition metal, then reacting that component with a precipitating agent, and then reacting the resulting solid with an activating component, wherein multiple activation steps are used so that it is possible to obtain a given level of activity with less activating component.

Abstract: An olefin polymerization catalyst system comprising (I) a polymerization catalyst produced by treating an inert support material, preferably a hydrated high surface area silica support having 1.00 to 1.50 hydroxyls per gram of silica with the reaction product of an organomagnesium compound and first a zirconium compound and/or a hafnium compound then a halogenator and tetravalent titanium compound, (II) an organoaluminum compound cocatalyst and (III) a chlorinated hydrocarbon promoter which produces polymers having broad molecular weight distribution in high yields.

Abstract: Polymerization of olefins in the presence of a catalyst system comprising a titanium-containing component A associated with a chemically treated silica-containing composition and a dihydrocarbylmagnesium compound and a cocatalyst component B comprising metal hydride or organometal compound derived from an element of Groups IA-IIIA of the Periodic Table.

Abstract: A polymerization catalyst providing a good balance of productivity and polymer fines prepared by reacting a metal halide, such as MgCl.sub.2, with a titanium compound, such as Ti(OEt).sub.4, to form a first catalyst component; mixing a solution of said first catalyst component with an organoaluminum compound at a temperature in the range of -100.degree. to 70.degree. C.; then heating to a higher temperature in the range of 50.degree. C. to 110.degree. C. to form additional precipitate, and then reacting the resulting solid with a halogenating agent.

Abstract: A process for homo- and copolymerization of mono-1-olefins in the presence of a mixed catalyst comprising as component A the product of fluorinated magnesium alkoxide with tetravalent halogenated titanium compounds and as component B organoaluminum compounds which, optionally, contain an aromatic ester and/or an organoaluminum halide compound. The catalysts exhibit increased polymer productivity and less formation of soluble polymer.

Abstract: A titanium halide containing catalyst component for polymerization of olefins which is prepared by reacting a magnesium hydrocarbyloxide with a silicon compound having a 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 halogenated hydrocarbon.

Abstract: A process for homo- and copolymerization of mono-1-olefins in the presence of a mixed catalyst comprising a component A the product of fluorinated magnesium alkoxide with tetravalent halogenated titanium compounds and as component B organoaluminum compounds which, optionally, contain an aromatic ester and/or an organoaluminum halide compound. The catalysts exhibit increased polymer productivity and less formation of soluble polymer.

Abstract: A free-flowing, high activity propylene polymer procatalyst component is prepared by the addition of limited amounts of a mineral oil (e.g., 5 to 25 percent) to the recovered MgCl.sub.2 /TiCl.sub.4 /ED procatalyst. The mineral oil becomes absorbed into the catalyst pores resulting in dry, free-flowing powders which retain their original activity for more than two months. This method of catalyst storage and shipping may prove more convenient than the previously used mineral oil slurries. Further, this technique of introducing suitable inert liquids into the catalyst pores results in substantial improvement in catalyst performance.

Abstract: An improved magnesium halide catalyst support is prepared by combining a magnesium component represented by the general formula R.sub.2 Mg.xAlR'.sub.3 wherein R is a hydrocarbyl or a hydrocarbyloxy group; R' is a halide, hydrocarbyl, a hydrocarbyloxy, a carboxyl or an acyl group; and x has a value such that the atomic ratio of Al:Mg is 0.025:1 to 0.25:1 with a non-metallic halide source under conditions such that the reaction temperature does not exceed 60.degree. C.

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 highly active and stereoselective olefin polymerization catalyst component is obtained by halogenating a magnesium compound of the formula MgR'R" wherein R' is an alkoxide or aryloxide group and R" is an alkoxide or aryloxide group or halogen, with a halide of tetravalent titanium in the presence of a halohydrocarbon, and contacting the halogenated product with an acid halide and a tetravalent titanium compound.

Abstract: A catalyst and method in which the catalyst is used with an aluminum cocatalyst in the polymerization and copolymerization of 1-olefins and is prepared by reacting a monofunctional organic silicon compound with silica, alumina, or the like followed by reacting the product of this reaction with a Group IIA organometallic compound or complex, then reacting this product with a halide or alkoxide of a metal of Group IVB or Group VB or mixtures thereof. If desired, the halide or alkoxide may be first reacted with the silicon compound reaction product before the reacting with the organometallic compound or complex.

Abstract: A catalyst and method in which the catalyst is used in association with an aluminum cocatalyst in the polymerization and copolymerization of 1-olefins. The catalyst is prepared by reacting certain multifunctional organic silicon compounds (silanes) with silica, alumina or the like having surface hydroxyl groups, or a mixture thereof, in which the silicon compound reacts with these surface hydroxyl groups, followed by reacting the product of this with a halide or alkoxide of a Group IVB or VB transition metal such as titanium, vanadium, zirconium or mixtures of these and finally reacting this product with a Group IIA organometallic compound or compounds such as magnesium and calcium. The Group IIA organometallic compound can also be added before these transition metal compounds.

Abstract: Catalyst components for the stereoregular polymerization of alpha-olefins, comprising a Ti halide and an electron-donor compound supported on an anhydrous magnesium dihalide and obtained by means of non-extractive treatments, with liquids having a dielectric constant at 20.degree. C. equal to or higher than 2, of compositions comprising an anhydrous Mg dihalide, the crystallites of which have an average size lower than 300 .ANG..The present invention refers to new catalyst components and the catalysts obtained therefrom for the polymerization of alpha-olefins Ch.sub.2 .dbd.CHR, wherein R is an alkyl radical with 1-4 C atoms or an aryl radical, and of mixtures of said alpha-olefins with minor amounts of ethylene.

Abstract: A method is provided for preparing hydrocarbon soluble magnesium siloxide supports comprising contacting such supports with sufficient aluminum alkoxide or organic ethers to render the supports hydrocarbon soluble. Thereafter the supports are contacted with a transition metal compound and halogenated to obtain polymerization catalysts.

Abstract: Components of catalysts for the polymerization of ethylene and of mixtures thereof with other olefins, in the form of emulsions or dispersions, in an inert liquid medium or in an inert gas phase of a liquid phase, comprising a compound of a metal of Groups IV to VI inclusive, of the Mendelyeev Periodic System, or a composition containing such a compound of the Mendelyeev Periodic System, which compound or composition is immiscible with aliphatic hydrocarbons, or which components are obtained from emulsions or dispersions, in an inert liquid medium or in gas phase, of a precursor of the catalyst component which, in the liquid state, is immiscible with the aliphatic hydrocarbons.An object of this invention is to provide new catalyst components for use in the polymerization of ethylene and of mixtures thereof with olefins and the catalysts obtained therefrom.

Abstract: A process for producing a novel highly active vanadium catalyst comprising a particulate solid produced by reacting a vanadium compound, a phosphorus compound, and an organoaluminum compound and its use in the polymerization of olefins.

Abstract: Catalysts having high efficiency in preparing olefin polymers while controlling molecular weight distribution are disclosed. The catalysts utilize magnesium siloxide supports and the product polymer molecular weight distribution can be controlled by the catalyst preparation.

Abstract: The present invention relates to catalysts for the polymerization and copolymerization of ethylene, characterized in that they comprise a support based on magnesium chloride and possibly on aluminium chloride, of spheroidal shape, having a mean diameter by mass comprised between 10 and 100 microns and with a narrow particle size distribution, such that the ratio of the mean diameter by mass to the mean diameter by number is less than or equal to 3, on which support there has been precipitated a derivative of a transition metal of groups IV, V and VI of the Periodic Table of Elements, and a polymerization process utilizing the said catalysts.

Abstract: Compositions exhibiting high catalytic activity in the polymerization of .alpha.-olefins are prepared by reacting a mixture of a tetrahydrocarbyloxy titanium compound such as tetraisopropyl titanate and/or a titanium tetrahalide such as titanium tetrachloride and a titaniumoxydihalide such as titaniumoxydichloride, an organomagnesium component such as a hydrocarbon soluble complex of dialkyl magnesium and an organoaluminum compound such as triethyl aluminum and a halide source such as ethyl aluminum dichloride. Polymerization processes employing this catalyst composition do not require conventional catalyst removal steps in order to provide polymers having suitable color and other physical characteristics and these catalysts provide higher efficiencies and a broader molecular weight distribution than those catalysts employing either of the titanium compounds alone.