Abstract: The invention generally relates to a catalyst, particularly a metallocene catalyst and catalyst system useful in the polymerization of olefins into a polymer product. The polymer product has a broad molecular weight distribution, a high molecular weight and a narrow composition distribution and is easily processable.

Abstract: Disclosed is a method of making polyethylene wherein ethylene, a catalyst, a cocatalyst and a solvent are added to a reactor. A first mixture is formed of the ethylene and either the catalyst or the cocatalyst and a second mixture is separately formed of the solvent and the other of the catalyst or cocatalyst. These two mixtures are then combined in a reactor to produce the polyethylene.

Abstract: A process for producing polyethylene having a broad molecular weight distribution is provided, in which ethylene and optionally a comonomer are contacted in two reactors connected in series, one reactor containing a titanium-based catalyst and the other reactor containing a vanadium-based catalyst and a halohydrocarbon promoter, or alternatively, both reactors containing a mixed metal catalyst comprising both titanium and vanadium. In the latter case, the halohydrocarbon promoter is present in only one of the reactors to activate the vanadium sites of the catalyst and deactivate the titanium sites of the catalyst simultaneously.

Abstract: The invention relates to a method for producing an ethylenic polymer composition, suitable for molding, at high catalytic efficiency. The ethylenic polymer composition produced has as a high melt tension when melted, and a high melt modulus (die swell ratio). The process comprises a three step polymerization of an olefin employing a transition metal catalyst, the catalyst being produced in a specific manner.

Abstract: A process for the production of polyethylenes or EPRs comprising contacting a mixture comprising ethylene, one or more alpha-olefins, and, optionally, a diene, under polymerization conditions, with a catalyst system comprising:(A) a catalyst precursor comprising:(i) a vanadium compound, which is the reaction product of(a) VX.sub.3 wherein each X is independently chlorine, bromine, or iodine; and(b) an electron donor, which is a liquid, organic Lewis base in which VX.sub.3 is soluble;(ii) a modifier having the formula BX.sub.3 or AlR.sub.(3-a) X.sub.a wherein each R is independently alkyl having 1 to 14 carbon atoms; each X is as defined above; and a is 0, 1, or 2; and(iii) a support for said vanadium compound and modifier,said catalyst precursor being in an independent or prepolymerized state,(B) a cocatalyst consisting of a compound having the formula AlR.sub.(3-a) X.sub.

Abstract: Catalysts useful in olefin polymerization are a mixture of (a) a titanium-containing compound which is (i) Ti(Z.sup.1).sub.t (OZ.sup.2).sub.p-t, (ii) the product of reacting Z.sup.3 --Mg--N(--Z.sup.5)--Si(Z.sup.4).sub.3 or Z.sup.3 --Mg--N(--Z.sup.5)--Si(Z.sup.4).sub.2 --N(--Z.sup.5)--Mg--Z.sup.3 with Ti(Z.sup.1).sub.t (OZ.sup.2).sub.p-t, or (iii) the product of reacting Mg metal, Mg dihalide and Ti(OZ.sup.2).sub.4, wherein Z.sup.1 is halide, Z.sup.2 is C.sub.1-18 hydrocarbyl, p is 3-4, t is 0-p, and Z.sup.3, Z.sup.4 and Z.sup.5 can be C.sub.1-18 alkyl or C.sub.6-14 aryl, and Z.sup.4 can be hydrogen, and Z.sup.5 can be --Si(Z.sup.4).sub.3 ; (b) one or more of V(X.sup.2).sub.c (OR.sup.2).sub.b-c, VO(X.sup.3).sub.d (OR.sup.3).sub.3-d, or VO(X.sup.4).sub.2, wherein X.sup.2, X.sup.3 and X.sup. 4 are halogen, R.sup.2 and R.sup.3 are C.sub.1-18 hydrocarbyl, b is 3-4, c is 0-b, and d is 0-3; and (c) Zn(X.sup.1).sub.2.2Al(R.sup.1).sub.3 and/or both of Zn(X.sup.1).sub.2 and one or more of M(R.sup.5).sub.e (X.sup.5).

Abstract: A catalyst useful in the polymerization of olefins, especially ethylene, is disclosed. The catalyst is obtained by admixing a zinc composition, a zirconium composition and a vanadium composition. The catalyst may be combined with a co-catalyst and, optionally, a modifier to yield an olefin polymerization system. The catalyst exhibits extremely high activity, good hydrogen response and produces polymers having broad molecular weight distribution ("MWD") and manifesting bimodal MWD profile.

Abstract: There is disclosed a process for producing a styrenic polymer or copolymer each having syndiotactic configuration which comprises polymerizing a styrenic monomer represented by the general formula (I) ##STR1## such as phenylstyrene and trimethylsilylstyrene, or copolymerizing at least two styrenic monomers of the formula (I) or at least one styrenic monomer of the formula (I) with at least one styrenic monomer other than the styrenic monomer of the formula (I) in the presence of a catalyst comprising as principal ingredients(A) a transition metal compound derived from a group IVB metal of the Periodic Table such as pentamethylcyclopentadienyltrimethyltitanium and (B) a compound producing an ionic complex by the reaction with the above transition metal compound such as tri(n-butyl)ammonium tetra(pentafluorophenyl)borate. The aforementioned process enables efficient production of a styrenic polymer or copolymer excellent in heat resistance and mechanical strength.

Abstract: Polyolefins exhibiting better particle properties are prepared by polymerizing an olefin or olefins in the presence of a catalyst comprising a solid catalyst component and an organometallic compound, the solid catalyst component being prepared by reacting the following components [I] and [II] at first and then reacting the reaction product thus obtained with the following component [III]:[I] a reaction product obtained by reacting:(1) a silicon oxide and/or an aluminum oxide, and(2) a titanium compound, or a titanium compound and a vanadium compound,[II] a reaction product obtained by the reaction of:(1) a magnesium halide,(2) a compound represented by the general formula Me(OR).sub.n X.sub.z-n wherein Me represents an element of J Groups I to IV in the Periodic Table, z represents the valence of the element Me, n is 0<n.ltoreq.

Abstract: A multiple site solid catalyst component capable of producing polyolefins having a broad or multimodal molecular weight distribution, such as a bimodal 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 a transition metal catalyst system, the improvement comprising including in the catalyst system an autoacceleration inhibitor, which (i) at about the temperature at which the catalyst system autoaccelerates, decomposes into a poison for the catalyst system; (ii) is present in the catalyst system in an amount sufficient to provide the quantity of poison required to inhibit the autoacceleration of the catalyst system at the autoacceleration temperature; and (iii) is either essentially inert at the normal operating temperature of the catalyst system or will cause substantially less inhibition of the catalyst system at the normal operating temperature than at the autoacceleration temperature.

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 invention provides a metallocene catalyst for use in preparing syndiotactic polyolefins. The catalyst comprises a bridged metallocene in which one of the cyclopentadienyl rings is substituted in a substantially different manner from the other ring. It was discovered that this type of catalyst is highly syndiospecific, and it also produces a polymer with a novel microstructure. The invention further includes the use of one or more of the catalysts in a polymerization process. The catalyst is generally described by the formulaR"(CpR.sub.n)(CpR'.sub.m)MeQ.sub.kwherein each Cp is a cyclopentadienyl or substituted cyclopentadienyl ring; each R.sub.n and R'.sub.m is the same or different and is a hydrocarbyl radicals having 1-20 carbon atoms; R" is a structural bridge between the two Cp rings imparting stereorigidity to the catalyst; Me is a group 4b, 5b, or 6b metal from the Periodic Table of Elements; each Q is a hydrocarbyl radical having 1-20 carbon atoms or is a halogen; 0.ltoreq.k.ltoreq.3; 0.ltoreq.n.

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: A support containing methylalumoxane and derivatives thereof is described which is formed by an incipient impregnation technique. The most preferred support is silica. Incipient impregnation in accordance with the invention provides a supported alumoxane, methylalumoxane, which substantially eliminates the problem of fluid bed reactor fouling when methylalumoxane is introduced into the reactor during its operation.In accordance with the invention, the process comprises providing methylalumoxane activated metallocene compound in particulate form as catalysts in fluid bed gas phase.

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: Polyolefin rubber which is an ethylene/propylene and/or 1-butene copolymer, which has a melt index of 0.3 to 15 dg/min and a relative density of 0.860 to 0.885, comprising 74-91 mol % of units derived from ethylene and 9-26 mol % of units derived from propylene and/or from 1-butene, characterised by a crystalline melting point J of 100.degree. to 125.degree. C. The process for obtaining this rubber consists in copolymerising, at a temperature of 150.degree.-300.degree. C. and at a pressure of 400-2000 bars, a gas stream containing 15-42% by vol. of ethylene and 58-85% by vol. of propylene and/or 1-butene, in the presence of a Ziegler-type catalyst system comprising at least one compound of a transition metal of groups IVB, VB, VIB and VIII of the Periodic Classification, and at least one organoaluminium compound and, if appropriate, in the presence of at least one chain transfer agent.

Abstract: A method is disclosed for preparing an olefin polymerization catalyst of improved particle size from a solution of magnesium containing component and a transition metal containing component which is reacted with an organoaluminum halide compound. The improved particle size is provided by employing the organoaluminum halide compound in conjunction with a silicon compound, such as for example an alkyl silicate or a polysiloxane.

Abstract: A method of using a catalyst with a suitable cocatalyst in the polymerization or copolymerization of 1-olefins are disclosed. The catalyst is prepared by: a) contacting a Group IIA organometallic compound, like 2-methylpentanoxymagnesium chloride, or a Group III organometallic compound, like triethylaluminum, or a combination thereof, with a porous or nonporous biodegradable substrate having active surface hydroxyl groups, like cellulose, to provide a modified biodegradable substrate; then b) contacting the modified biodegradable substrate with a transition metal compound, such as a transition metal halide or alkoxide, like titanium tetrachloride or vanadium (V) trichloride oxide, to form discrete catalyst particles. The catalyst particles are used in conjunction with a suitable cocatalyst, like triethylaluminum, in the homopolymerization or copolymerization of 1-olefins. During polymerization, porous biodegradable catalyst particles are fragmented into small solid particles that are trapped within polymer.

Abstract: A process for the preparation of a solid component of a catalyst active in the (co)polymerization of ethylene and able to form (co)polymers of ethylene having from middle to wide distribution of molecular weight and monomodal distribution of molecular weights, in processes operating in a single step, in suspension or in the gaseous phase. Said solid component of a catalyst contains magnesium, chlorine, silicon, titanium and at least another transition metal on a solid, granular and porous carrier and is obtained by treating the carrier, in succession, with: a compound of a metal selected from hafnium, zirconium or vanadium; a magnesium dialkyl or magnesium alkyl halide; a silicon chloride; and a titanium compound.

Abstract: A transition metal containing catalyst useful for the polymerization of .alpha.-olefins is prepared by (A) forming in an inert atmosphere which excludes oxygen and moisture a slurry of (1) a porous inorganic oxide support material selected from the group consisting of silica, alumina, or a combination of silica and alumina, said support material containing not greater than about 5 millimoles of hydroxyl groups per gram of support material and a particle size not greater than about 10 microns and a surface area of from about 50 to about 800 m.sup.2 /g in an inert organic liquid medium; (B) mixing said slurry with (2) an alkoxide and stirring the resultant mixture at a temperature of from about -20.degree. C. to about 120.degree. C. for a time sufficient to saturate the surface of the support material; (C) mixing the product form (B) with (3) a titanium compound or a combination of a titanium compound and (4) a vanadium compound and stirring the resultant mixture at a temperature of from about -20.degree. C.

Abstract: A process for making a magnesium-containing supported titanium-containing and vanadium-containing catalyst or catalyst component for the polymerization or copolymerization of alpha-olefins.

Abstract: Homopolymerization and copolymerization of ethene is carried out using a Ziegler catalyst system consisting of (1) a transition metal catalyst component, (2) an organoaluminum catalyst component and (3) an organohalogen catalyst component. The component (1) used is the solid-phase product (VI) which has been obtained by a method in which (1.1) first (1.1.1) an inorganic oxidic substance (I) as a carrier and (1.1.2) a solution (II) of (IIa) a certain oxahydrocarbon and (IIb) a mixture of (IIb1) a vanadium trichloride/alcohol complex and (IIb2) a titanium trihalide or titanium trihalide/alcohol complex and (IIc) a silicon or boron compound are combined with formation of a suspension (III) and the latter is evaporated to form a solid-phase intermediate (IV) and (1.2) then (1.2.1) the intermediate (IV) obtained in (1.1) and (1.2.

Abstract: A multiple site solid catalyst component capable of producing polyolefins having a broad or multimodal molecular weight distribution, such as a bimodal 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: 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 IVB, 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: 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 prepolymerised 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: 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: 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: A fine filling method for dental purposes is characterized in that a fine filler in the form of a powder, a granulate, a suspension or paste, containing finely divided particles of hydroxy-apatite or tetracalcium phosphate, with or without an adjuvant, is rubbed on the surface of a tooth and contacted with saliva. The fine filler for use in this method may contain a calcification-promoting protein.

Abstract: An olefin polymerization catalyst comprising (a) a supported transition metal containing component comprising the support treated with at least one metallocene and at least one non-metallocene transition metal compound, and a cocatalyst comprising an alumoxane and an organometallic compound of a metal of Groups IA, IIA, IIB, or IIIA of the Periodic Table.

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: 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: 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: 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 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: 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: 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: This invention pertains to the use of pyridinium isopoly and heteropoly molybdates and tungstates as catalysts in a metathesis catalyst system in polymerization of norbornene-type monomers by ring opening polymerization. Polymerization can be by reaction injection molding in absence of a solvent whereby a thermoset polymer is produced or by solution polymerization in presence of a suitable solvent whereby a thermosetting or a thermoplastic polymer is produced. The monomers are selected from polycycloolefins containing at least on enorbornene group and mixtures thereof.

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: 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: 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 polyacetylene film having a high electroconductivity is prepared by (a) heating a Ziegler-Natta catalyst at a temperature not lower than 150.degree. C. in an organic solvent and then, cooling the catalyst-solvent mixture, (b) removing coarse catalyst particles having a diameter of larger than 1 .mu.m from the catalyst-solvent mixture by filtration to form a catalyst dispersion for polymerization, (c) introducing acetylene into the catalyst dispersion to effect polymerization of acetylene, and (d) drawing the formed polymer and treating the drawn polymer with a dopant.

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.