Abstract: A supported polymerization catalyst component and a catalyst system useful in the production of polyolefin resins that have a narrow particle size distribution and enhanced crystallization rates is provided. The supported polymerization component comprises talc, an organomagnesium compound or complex, wherein the weight ratio of talc to magnesium in the organomagnesium compound or complex is from about 1000:1 to about 5:1, at least one transition metal containing compound and/or a metallocene effective in alpha-olefin polymerization reactions, and, optionally, an alcohol or a silane. The catalyst system of the instant invention includes the aforementioned alpha-olefin polymerization catalyst component and at least one aluminum-containing cocatalyst compound. A process for polymerizing or copolymerizing alpha-olefins, conducted under olefin polymerization conditions utilizing the inventive catalyst system of this invention is also described.

Abstract: Presence of a catalyst formed from (A) a transition metal compound comprising (A-1) a transition metal atom, (A-2) a hetero atom-containing ligand containing a heteroatom selected from oxygen, sulfur, nitrogen and phosphorus capable of forming a bond with the transition metal atom, and (A-3) a ligand having a conjugated .pi. electron through which the ligand can be bonded to the transition metal atom (A-1), and (B) an aluminoxane. The transition metal compound is pre-treated with (C) an organometallic compound, or (D) a halogen-containing inorganic compound of an element of Group III, IV or V of the periodic table in an organic solvent.

Abstract: Catalyst compositions comprising both metallocene complexes having polymerisable groups and polymerization catalysts eg Ziegler-Natta may be used for the preparation of polyolefins. The catalyst compositions may comprise the metallocene complex in the form of a polymer and may suitably be supported on inorganic supports. Polymers having a wide range of molecular weights and comonomer distributions may be prepared by use of the catalyst compositions. Preferred metallocene complexes are zirconium complexes in which the polymerisable group is vinyl.

Abstract: A composition which can be used in, for example, slurry polymerization of an olefin such as, for example, ethylene is produced by a process comprising: (1) combining a first transition metal compound and a metal halide to form a solution; (2) contacting the solution with a precipitating agent to form a solid catalyst intermediate; (3) contacting the solid catalyst intermediate with a second transition metal compound to produce a catalyst composition; and optionally (4) depositing a prepolymer onto the catalyst composition. The precipitating agent comprises a sufficient amount of both a Lewis acid and an ether to effect the precipitation of a solid. Also disclosed is the use of the composition in polymerization of an olefin.

Abstract: According to the present invention there are provided a catalyst component, a catalyst using the catalyst component and a process using the catalyst, for the preparation of olefin polymers high in molecular weight and relatively wide in molecular weight distribution, using an extremely small amount of a modified organoaluminum compound such as methylaluminoxane and in high yield. The catalyst component is prepared by contacting at least the following constituents (1), (2), (3) and (4) with one another:(1) a compound represented by the general formula Me.sup.1 R.sup.1.sub.p (OR.sup.2).sub.q X.sub.4-p-q where R.sup.1 and R.sup.2 are each independently a hydrocarbon group having 1 to 24 carbon atoms, X is a halogen atom, Me is Zr, Ti or Hf, p and q are each an integer in the ranges of 0.ltoreq.p.ltoreq.4 and 0.ltoreq.q.ltoreq.4, provided 0.ltoreq.p+q.ltoreq.4;(2) at least one compound selected from the group consisting of compounds represented by the following general formulas 1 to 4:General formula 1: Me.sup.

Abstract: Process for the preparation of a solid catalyst component for olefins polymerization including (1) a magnesium halide in active form, (2) a titanium compound, and (3) an electron-donor compound selected from particular 1,3-diethers, the process being carried out by reaction between the compounds from (1) to (3), and including at least two additions of electron-donor (3) in the following order:a) one addition prior to or during a reaction with the titanium compound or with a halogenated compound, and thenb) one addition prior to or during a further reaction with the titanium compound.

Abstract: A process for producing an alpha-olefin polymer, which comprises polymerizing an alpha-olefin in the presence of a catalyst formed from (A) a transition metal compound comprising (A-1) a transition metal atom, (A-2) a hetero atom-containing ligand containing a heteroatom selected from oxygen, sulfur, nitrogen and phosphorus capable of forming a bond with the transition metal atom, and (A-3) a ligand having a conjugated .pi. electron through which the ligand can be bonded to the transition metal atom (A-1), and (B) an aluminoxane. The transition metal compound may be pre-treated with (C) an organometallic compound, or (D) a halogen-containing inorganic compound of an element of Group III, IV or V of the periodic table.

Abstract: A process for the polymerization of one or more conjugated dienes by means of a rare earth based catalyst in which the catalyst is formed by bringing together in liquid hydrocarbon medium in the presence of a small portion of conjugated diene: a) a rare earth salt, b) an organo aluminum and c) a silicon halide or organosilicon halide and aging the catalyst before contact with the conjugated diene(s) to be polymerized. This catalyst formation procedure offers the possibility of producing a diene polymer of high cis content with a narrower molecular weight distribution and/or smaller high molecular weight fraction which is reflected in improved processing characteristics and reduced viscosity in styrene.

Abstract: Inorganic and organic impurities are removed from a metallocene catalyst compound comprising the steps of (a) separating inorganic impurities from said compound by forming a solution of said compound in an organic solvent medium which is substantially a non-solvent for said inorganic impurities, (b) treating the solution of said compound with a particulate absorbing material so as to absorb and remove organic impurities from said solution, and (c) separating the solid material, including said particulate absorbing material, from said solution. Optionally, water can be removed by adding a drying agent.

Abstract: A new catalyst useful in the polymerization of at least one olefin is disclosed. The catalyst comprises the product obtained by contacting silica, in random order, with (1) at least one hydrocarbon soluble magnesium-containing compound; and (2) a first modifying compound selected from the group consisting of silicon halides, boron halides, aluminum halides and mixtures thereof followed by a second modifying compound selected from the group consisting of halides having the structural formula SiH.sub.r X.sup.2.sub.s, where X.sup.2 is halogen; r is an integer of 1 to 3; and s is an integer of 1 to 3 with the proviso that the sum of r and s is 4, a hydrogen halide and mixtures thereof. The product of this step is contacted with a first titanium-containing compound having the structural formula Ti(OR).sub.m X.sub.n, where R is hydrocarbyl or cresyl; X is halogen; m is an integer of 1 to 4; and n is 0 or an integer of 1 to 3, with the proviso that the sum of m and n is 4.

Abstract: A catalyst compound of the formula (I) is useful in the polymerization of ethylene into homopolymers or copolymers of high density and high melt flow ratio. The catalyst is prepared with a partial activation step before its complete activation with a co-catalyst.Mg.sub.a Ti(OR).sub.b X.sub.c Al.sub.d (R").sub.ej X'.sub.fj H.sub.gj [ED].sub.h B.sub.i Br.sub.

Abstract: A method for producing a stereoregular polyolefin in the presence of a catalyst comprising a transition metal compound and an organometallic compound, which comprises polymerizing at least one olefin in the presence of a catalyst system comprising:(A) a solid catalyst component comprising Mg, Ti, halogen and an electron donative compound,(B) at least one member selected from the group consisting of organometallic compounds of metals of Groups IA, IIA, IIB, IIIB and IVB of the Periodic Table,(C) an electron donative compound, and(D) a boron compound of the formula R.sup.1.sub.n BX.sub.3-n wherein R.sup.1 is a hydrocarbon group and/or a halogenated hydrocarbon group, X is a halogen atom, and 0.ltoreq.n.ltoreq.3.

Abstract: The present invention is directed to a supported metallocene catalyst useful in the polymerization of .alpha.-olefins which is obtained by tethering a metallocene catalyst component to the surface of a particulate, functionalized copolymeric support material.

Abstract: The present invention relates to spherical solid components of catalysts for the polymerization of olefins comprising, supported on a magnesium dihalide in active form, a titanium compound containing at least one Ti-halogen bond and one OR group, said OR group being bonded to Ti in an amount such that the OR/Ti molar ratio is greater than or equal to 0.5; optionally the component also comprises an electron donor compound. The spherical solid components of the invention are characterized by having a porosity comprised between 0.35 and 0.7 cm.sup.3 /g and by a pore size distribution such that at least 50% of the porosity is due to pores having an average radius greater than 800 .ANG..

Abstract: A procatalyst composition which is suitable for the homo- and copolymerization of alpha olefins together with an organometallic cocatalyst compound and which is prepared by treating an inorganic carrier with a component system containing a complex of a magnesium halide and a tetraalkyl titanate, and a chlorinating compound which does not contain a transition metal compound. In order to raise the Mg:Ti ratio, the component system additionally contains an organomagnesium compound.

Abstract: The present invention relates to spherical solid components of catalysts for the polymerization of olefins comprising, supported on a magnesium dihalide in active form, a titanium compound containing at least one Ti-halogen bond, and optionally an electron donor compound. The spherical solid components of the invention are characterized by porosity values higher than 1 cm.sup.3 /g and a pore size distribution such that at least 30% of their pores have an average radius greater than 10000 .ANG..

Abstract: A catalyst composition for producing linear low density polyethylene with relatively narrower molecular weight distributions is described. The catalyst is formed by treating silica having reactive OH groups with a dialkylmagnesium in a solvent for said dialkylmagnesium; then adding to said magnesium-containing support a mixture of ROH and SiCl.sub.4 to form an intermediate which is subsequently treated with a transition metal to form a transition metal-containing intermediate, the catalyst precursor. The catalyst precursor is activated with a trialkylaluminum compound.

Abstract: A solid product as a catalyst component for an olefin polymerization catalyst is obtained by the reaction of metallic magnesium, an alcohol, and a halogen in an amount ranging from 0.019 to 0.06 gram-atom per one mole of metallic magnesium. Alternatively, the halogen component is a halogen-containing compound which contains not less than 0.0001 gram-atom of a halogen atom per one gram-atom of metallic magnesium.

Abstract: A vanadium-containing catalyst system particularly suited to the polymerization of blow moldable olefin polymers. The catalyst system includes a supported, first catalyst component prepared by contacting preheated silica, with (1) a compound or complex which includes at least one carbon to magnesium covalent bond and (2) a compound which includes at least one carbon to Group III metal covalent bond. The sequence of contact of the silica with compound or complex (1) and compound (2) is optional. However, unless the compound or complex (1) and the compound (2) contact the silica simultaneously, the product of this contact is next contacted with whichever of compound (1) or (2) does not initially contact the silica. The product of the step of contacting with compounds (1) and (2) is contacted with a vanadium compound which includes at least one halogen atom. Finally, the product of the vanadium compound contacting step is contacted with an alcohol.

Abstract: A solution process, and a catalyst therefor, for the preparation of high molecular weight polymers of alpha-olefins viz. homopolymers of ethylene and copolymers of ethylene and C.sub.3 -C.sub.12 alpha-olefins, is disclosed. The process is operated under solution polymerization conditions at 105.degree.-320.degree. C. The catalyst is obtained from titanium tetrahalides, vanadium oxytrihalides and organoaluminum compounds, in which an admixture of catalyst components is heat-treated at 180.degree.-250.degree. C. and subsequently cooled to a temperature of less than 150.degree. C. Additional vanadium oxytrihalide is then added. The resultant catalyst solution is activated with an aluminum compound. The catalyst has good activity, showing superior activity to catalysts in which additional vanadium oxytrihalide is not added or added at temperatures above 150.degree. C.

Abstract: Ziegler polymerization of .alpha.-olefins is disclosed which is characterized by a solid catalyst component and an organoaluminum component used in the Ziegler catalyst, and also by the temperature used which is 150.degree. to 300.degree. C. The solid catalyst component, Component (A), comprises Sub-component (i) which is a solid catalyst component for Ziegler catalysts comprising Ti, Mg and a halogen; Subcomponent (ii) which is a silicon compound represented by a formula:R.sup.1.sub.m X.sub.n Si(OR.sup.2).sub.4-n-mwherein R.sup.1 indicates a hydrocarbyl group, R.sup.2 which may be the same as or different from R.sup.1 indicates a hydrocarbyl group, X is a halogen atom, and m and n are each a number satisfying equations 0.ltoreq.m.ltoreq.3, 0.ltoreq.n.ltoreq.3 and 0.ltoreq.m+n.ltoreq.3; and Sub-component (iii) which is an organometal compound of a metal of Groups I to IV of the Periodic Table. The organoaluminum component (B) is an organoaluminum compound which is a mixture of the following Sub-component (B.

Abstract: A catalyst component useful in the polymerization of olefins is disclosed. The catalyst component comprises the product obtained by steps of (a) contacting silica with at least one hydrocarbon soluble magnesium-containing compound; (b) contacting the product of step (a) with component (1), a heterocyclic fused ring compound substituted with at least one oxygen atom, and component (2), a modifying compound selected from the group consisting of silicon halides, boron halides, aluminum halides, alkyl silicon halides and mixtures thereof, with the proviso that components (1) and (2) be present such that the molar ratio of component (2) to component (1) is at least about 4:1; and (c) contacting the product of step (b) with a titanium-containing compound having the structural formula TiX.sub.m (OR).sub.n, where X is halogen; R is hydrocarbyl; m is an integer of 1 to 4; and n is 0 or an integer of 1 to 3 with the proviso that the sum of m and n is 4.

Abstract: The invention relates to a method for the preparation of a solid procatalyst composition for a catalyst system intended for the polymerization of olefins, wherein a magnesium halide, such as magnesium chloride, is dissolved and/or slurried in a mono-carboxylic acid alkyl ester, such as ethyl acetate, is impregnated into a support material, dried, treated with an organometallic compound or a silicon compound and thereafter with a transition metal compound. The invention also relates to such a procatalyst composition and its use together with a cocatalyst for the polymerization of olefins. According to the invention it has been possible to increase the activity of the catalyst composition by using a silanated support material, such as silanated silica, which is then treated with an organometallic or silicon compound before treatment with a transition metal compound. The silanated silica is preferably a silicon dioxide which has been heat-treated at 1000.degree.-200.degree.

Abstract: A high activity olefin polymerization catalyst catalyzes the production of polymeric lower .alpha.-olefin having good properties. The catalyst is produced from an organoaluminum cocatalyst, a selectivity control agent and a novel olefin polymerization procatalyst which is prepared by contacting a tetravalent titanium halide, an optional inert diluent, an electron donor and a novel solid procatalyst precursor obtained by contacting (a) a carbonated magnesium alkoxide of the general formula ##STR1## wherein R is a hydrocarbyl group having up to 12 carbon atoms and x is a number from 0.1 to about 2; and (b) at least one halogenating compound which is a non-transition metal halogenated compound or non-metallic halogenated compound. A process for polymerizing one or more .alpha.-olefins utilizing the novel high activity polymerization catalyst.

Abstract: A polymer supported catalyst comprises Ziegler-Natta catalysts immobilized on a magnesium-modified polymer support. The catalyst support is prepared by (1) dissolving a carboxyl group-containing polymer in a solvent and precipitating the polymer in a polar non-solvent, (2) wet-grinding the precipitated polymer, and (3) mixing the ground polymer with an organomagnesium compound or a complex of an organomagnesium compound and an organoaluminum compound to give a magnesium-modified polymer support. Optionally, the resulting magnesium-modified support is treated with a halogen-containing silicon compound. The catalysts may be loaded onto the support by reacting the magnesium-modified support with a transition metal compound to form a catalyst constituent, and then combining the catalyst constituent with an appropriate organo-metallic compound.

Abstract: Novel chromium-containing compounds, such as, for example, chromium pyrrolides, are prepared by forming a mixture of a chromium salt, a metal amide, and an electron pair donor solvent, such as, for example, an ether. These novel chromium-containing, or chromium pyrrolide, compounds can be used either unsupported or supported on an inorganic oxide support, with a metal alkyl and an unsaturated hydrocarbon, to trimerize, oligomerize, and/or polymerize olefins.

Abstract: A process to produce a polyethylene composition that has less than 2 weight percent fines, based on the weight of said polyethylene composition, and a fluff bulk density greater than 25 pounds per cubic foot, said process comprising polymerizing ethylene in the presence of a trialkylaluminum compound, and a diluent that is essentially saturated with ethylene under slurry polymerization conditions that comprise a polymerization temperature from 104.degree. C. to 116.degree. C., with an activated catalyst system comprising (a) a catalyst support that comprises a silica compound, wherein said catalyst support has a pore volume less than 2 cubic centimeters per gram, (b) a catalyst that comprises a chromium compound, wherein the amount of chromium in said catalyst system is from about 0.1 to about 20 weight percent, wherein said weight percent is based on the total weight of said catalyst and catalyst support, and (c) a fluorine compound, wherein the amount of fluorine used is from about 0.

Abstract: A process for preparing a polymerization catalyst useful for the polymerization of olefins is provided comprising contacting a magnesium compound and a transition metal halide to form a solid product; contacting the solid product with an organoaluminum halide to form a first catalyst component, and contacting the first catalyst component with an activating agent to form a catalyst. Other aspects of the invention provide a catalyst prepared by the above described method and a polymerization process employing the thus prepared catalyst.

Abstract: A solid component of catalyst, active in the polymerization of propylene and other .alpha.-olefins in stereoregular polymers, is obtained:(i) by treating a non-activated silica support in particles with a tin tetrahalide, to at least partially block the hydroxylic groups of the silica and to obtain a blocked silica;(ii) by impregnating the blocked silica with magnesium dialkyl or magnesium alkyl halide to make the magnesium compound react with the tin compound and with possible residual hydroxylic groups of the silica and to obtain a support;(iii) by halogenating the support by contact with a halogenating agent selected from the halides of tin, antimonium or silicon to obtain a halogenated support;(iv) by titanating the halogenated support with an excess of a titanium tetrahalide to obtain a titanated support;(v) by putting the titanated support in contact with a Lewis base, to obtain a solid component of catalyst.

Abstract: The present invention relates to a novel catalyst component for ethylene polymerization comprising vanadium and titanium. Moreover, when the vanadium/titanium containing catalyst of the present invention is employed with an aluminum-containing cocatalyst enhanced activity as well as melt index is obtained.The present invention is directed to a novel halosilane cocatalyst component which, when used in conjunction with an aluminum containing cocatalyst, is effective in increasing the activity of a silica supported titanium/vanadium containing solid catalyst component in the polymerization of ethylene and/or .alpha.-olefins. In addition to the increased catalytic activity, the polymers produced by the present invention exhibit improved melt index values compared with melt index values typically obtained using prior art catalyst systems. Thus, the catalyst system of the instant invention represent an advancement in the art in view of the combination of increased activity, i.e.

Abstract: The present invention is directed to a novel halosilane cocatalyst component which, when used in conjunction with an aluminum containing cocatalyst, is effective in increasing the activity of a supported magnesium/titanium containing catalyst in the polymerization of ethylene and .alpha.-olefins. In addition to the increased catalytic activity, the polymers produced by the present invention are characterized as having an unexpected enhancement in the polymer melt index. Thus, the catalyst system of the instant invention represents an advancement in the art in view of the combination of increased activity, i.e., yield of polymer produced, and physical properties of the polyolefin product.In another aspect of the present invention, a process for polymerizing .alpha.-olefins is disclosed.

Abstract: The invention concerns:a catalytic solid containing magnesium, a halogen, titanium and silicon, this catalytic solid also containing aluminium and being microporous;a process for preparing this catalytic solid;use of this catalytic solid for polymerising alpha-olefines.

Abstract: The present invention is directed to a novel halosilane cocatalyst component which may be used in conjunction with an aluminum-containing cocatalyst to provide enhanced catalytic activity of a vanadium based solid catalyst component in the polymerization of .alpha.-olefins. In addition to the enhancement in the catalytic activity obtaining using the present catalyst system, the resultant polymer produced by the present invention exhibits improved physical properties compared with polymers produced by prior art vanadium based catalyst systems. Thus, the catalyst system of the instant invention represents an advance in the art in view of the combination of increased catalytic activity, i.e. yield of polymer produced, and enhanced physical properties of the polyolefin produced.In accordance with the present invention, a catalyst system is provided which comprises a solid catalyst component and a halosilane cocatalyst component.

Abstract: A supported solid component of catalyst, for the stereospecific polymerization of propylene and other .alpha.-olefins, is obtained by making a non-activated silica interact in succession with: (i) a magnesium dialkyl or halide of magnesium alkyl; (ii) a halogenating agent selected from silicon, tin and antimony halides; (iii) a titanium tetrahalide; and (iv) a Lewis base. A catalyst for the stereospecific polymerization of propylene and other .alpha.-olefins is composed of: (A) the solid component of catalyst; (B) an aluminium trialkyl or aluminium alkyl halide; and (C) an electron donor compound, capable of forming a complex compound with component (B).

Abstract: Solid catalyst components for the preparation of catalysts capable of producing polymers and copolymers of ethylene with ultra high molecular weight are obtained in the form of particles having an average diameter of less than 10 micrometers, by way of reaction, in the presence of H.sub.2 O, between:1) a liquid obtained by reacting:A) a titanium compound containing at least one Ti--OR bond, where R is a C.sub.1 -C.sub.20 alkyl, C.sub.3 -C.sub.20 cycloalkyl, or C.sub.6 -C.sub.20 aryl radical; withB) a magnesium compound selected from the group consisting of: halides; compounds comprising at least one --OR or--OCOR group bonded to the magnesium, where R is a C.sub.1 -C.sub.20 alkyl, C.sub.3 -C.sub.20 cycloalkyl, or C.sub.6 -C.sub.20 aryl radical; organometallic compounds; products of the reaction between the above mentioned compounds and electron-donor compounds; and2) a compound or composition capable of halogenating and optionally reducing (A).

Abstract: An ethylene polymerization catalyst system is provided. This catalyst system is produced by the process comprising forming an activated and reduced composition that is substantially free of titania and that comprises a fluorine compound, a chromium compound, and a catalyst support that consists essentially of silica.An ethylene polymerization process is provided. This process uses the ethylene polymerization catalyst system above. This catalyst system is contacted with ethylene, in the presence of hydrogen and trialkylaluminum, under polymerization conditions, to produce a polyethylene resin.

Abstract: A supported Ziegler-Natta catalyst active in ethylene polymerization and in the copolymerization of ethylene with alpha-olefins consists of:(A) a cocatalyst in the form of an organometallic compound of aluminium, and(B) a solid catalyst component obtained by:(i) impregnating a granular solid support with a solution of a titanium alcoholate and magnesium chloride in a liquid aliphatic hydrocarbon, followed by evaporation of the hydrocarbon solvent;(ii) impregnating the support treated in (i) with a solution of magnesium chloride in a liquid aliphatic ester, followed by evaporation of the ester solvent; and(iii) activating the support treated in (ii) by contact with an alkyl aluminium halide.In a preferred embodiment, measured quantities of a silicon halide are introduced in stage (i) and/or (ii), this considerably improving catalytic activity.

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 process for the production of a highly active olefin polymerization vanadium catalyst, comprising a vanadium compound and an organophosphorous compound combined on a catalyst support, which is capable of producing a broad range of polymer products. The polymer product's molecular weight distribution may be tailored to suit a desired application by controlling the P/V ratio of the catalyst.

Abstract: The invention relates to catalysts which produce linear low density polyethylene with a bimodal molecular weight distribution, particularly those containing a high molecular weight fraction. The catalysts are formed by contacting a carrier with an organomagnesium compound to incorporate magnesium into the carrier, and subsequently contacting the carrier containing the incorporated magnesium with a silicon compound and subsequently with a transition metal source; the transition metal containing intermediate is again treated with an organomagesium compound to form a catalyst precursor, and the catalyst precursor is activated with dimethylaluminum chloride.

Abstract: Catalyst components for the polymerization of an olefin, such as ethylene, are formed by reacting, in a single reaction step, an organomagnesium compound, an alkoxy silane, and a chlorinating reagent.

Abstract: A process for preparing a polymerization catalyst useful for the polymerization of olefins is provided comprising contacting a metal dihalide compound wherein the metal is selected from Group 2 and Group 12 of the Periodic Table and a transition metal compound which is a hydrocarbyloxide of a transition metal selected from Group 4 and Group 5 to form a first catalyst component; contacting the first catalyst component with at least one organoaluminum precipitating agent, wherein at least at the commencement of this step, the temperature at which such contacting is carried out is greater than about 70.degree. C. to about 150.degree. C. to form a solid product, and contacting the solid product with an activating agent to form a catalyst. Other aspects of the invention provide a catalyst prepared by the above described method and a polymerization process employing the thus prepared catalyst.

Abstract: A method for making polymerization catalysts is disclosed which comprises contacting a soluble complex prepared from the combination of a metal dihalide and a transition metal compound with a particulate material comprising zirconium phosphate and then reacting the resulting mixture with an organoaluminum halide to produce a catalyst precursor. The catalyst precursor is then contacted with a halogen containing compound selected from halides of Groups IVA and VA to produce the catalyst. Novel catalysts prepared in accordance with the invention method, novel polymerization processes therewith and novel polymers having relatively high melt flow rates while retaining good mechanical strength are also disclosed.

Abstract: A method for producing a stereospecific polyolefin in the presence of a catalyst comprising a transition metal compound and an organometallic compound, wherein a catalyst system is used which comprises: (A) a solid catalyst component prepared by reacting a homogeneous solution containing (i-1) magnesium and a hydroxylated organic compound, (i-2) an oxygen-containing organic compound of titanium and/or (i-3) an oxygen-containing organic compound of silicon and an oxygen-containing organic compound of aluminum and/or a boron compound, with (ii) at least one aluminum halide compound to obtain a solid product, and further reacting to this solid product (iii) an electron-donative compound, (iv) a titanium halide compound, and (v) ethylene and/or an .alpha.-olefin having at least 3 carbon atoms, (B) at least one member selected from the group consisting of organometallic compounds of Groups IA, IIA, IIB, IIIB and IVB of the Periodic Table, and (C) an electron-donative compound.

Abstract: A solid component of 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 aluminium alkyl chloride.

Abstract: A polymerization catalyst useful for the polymerization of olefins is prepared by contacting a metal dihalide compound having a metal selected from Group 2 and Group 12 of the Periodic Table and a transition metal compound which is a hydrocarbyloxide of a transition metal selected from Group 4 and Group 5 to thereby form a first catalyst component; contacting the first catalyst component with at least one organoaluminum precipitating agent to form a solid product; and contacting the solid product with an ester and then an activating agent to form a catalyst. Other aspects of the invention include a catalyst produced by the above described process and a polymerization process employing the thus produced catalyst.

Abstract: Catalytic solids based on titanium trichloride complex, usable for the stereospecific polymerization of alpha-olefins, obtained by heat treatment, in the presence of a halogenated activating agent, of the liquid material resulting from bringing TiCl.sub.4, pretreated with an electron-donor compound, into contact with a composition (C) corresponding to the general formulaAlR.sub.p (Y) .sub.q X .sub.3-(p+q)in whichR represents a hydrocarbon radical or a hydrogen atom;Y represents a group chosen from --OR', --SR' and --NR'R", in which R' and R" each represent a hydrocarbon radical or a hydrogen atom;X represents a halogen;p is an arbitrary number such that 0<p<3; andq is an arbitrary number such that 0<q<3; the sum (p+q) being such that 0<(p+q).ltoreq.3.These catalytic solids of controllable porosity permit the production of a wide range of propylene polymers, in particular the propylene and ethylene copolymers known as "block" copolymers.

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: 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: A highly active Ziegler-Natta catalyst for polymerizing HDPE and LLDPE at low temperature and pressure may be prepared by reacting a magnesium compound and a halogen compound with an electron donor compound to dissolve, reacting the resulting solution with a titanium compound to obtain the homogeneous solution and then adding a small quantity of surfactant to the homogeneous solution. Ethylene polymers and copolymers were prepared by activating the resulting catalyst to obtain the granular polymer having density of from 0.92 to 0.98 g/cm.sup.3 and in which the particle size distribution was narrow.