Abstract: A method for producing water dispersible CuO nanostructures includes mixing copper nitrate with an ammonia solution. The copper nitrate and ammonia solution can be treated with ultrasound at room temperature. The water dispersible CuO nanostructures can be produced without any surfactant.

Abstract: Process for the preparation of catalytic support and supported bimetallic catalysts for production of homopolymers and copolymers of ethylene with ?-olefins, of high and ultra high molecular weight and with broad molecular weight distribution in slurry, bulk and gas phase processes and products thereof. The present invention relates to a process for the preparation of catalytic support and the supported bimetallic catalysts, used in the production of ethylene homopolymers and ethylene copolymers with ?-olefins, of high and ultra high molecular weight with broad molecular weight distribution, in gas or liquid phase polymerization processes, the latter being in slurry, bulk or suspension, and the products obtained from these processes.

Abstract: This invention relates to an organotin-based catalyst system for polyurethane synthesis that is useful in coatings applications. The catalyst has low activity in the absence of oxygen. When a coating mixture comprising the catalyst is sprayed and/or applied to a substrate as a thin film in air, the catalyst is activated. For solvent-based refinish systems comprising hydroxyl and isocyanate species at high solids levels, the catalyst system therefore provides extended viscosity stability, i.e., pot life.

Abstract: A catalyst composition that is the combination of or the reaction product of ingredients comprising (a) a nickel-containing compound, (b) an alkylating agent, (c) a fluorine-containing compound, and (d) a chlorine-containing compound.

Abstract: A catalyst composition that is the combination of or the reaction product of ingredients comprising (a) a lanthanide compound, (b) an organoaluminum hydride, and (c) a tin halide compound.

Abstract: The present invention relates to a supported catalyst system for olefin polymerization which comprises at least one metallocene component and a support of an inorganic oxide of silica, aluminum or a polymer containing hydroxyl groups. The support is modified with an organogermane and/or organotin compound. The inventive catalyst system produces minimal reactor fouling, has excellent productivity and good hydrogen responsiveness. The present invention also relates to a process for preparing the catalyst system and to the slurry/suspension or gas-phase polymerization of olefins using the catalytic system, optionally with a small amount of aluminoxane cocatalyst.

Abstract: The present invention relates to a supported catalyst system for olefin polymerization which comprises at least one metallocene component and a support of an inorganic oxide of silica, aluminum or a polymer containing hydroxyl groups. The support is modified with an organogermane and/or organotin compound. The inventive catalyst system produces minimal reactor fouling, has excellent productivity and good hydrogen responsiveness. The present invention also relates to a process for preparing the catalyst system and to the slurry/suspension or gas-phase polymerization of olefins using the catalytic system, optionally with a small amount of aluminoxane cocatalyst.

Abstract: Catalysts and methods for alkane oxydehydrogenation are disclosed. The catalysts of the invention generally comprise (i) nickel or a nickel-containing compound and (ii) at least one or more of titanium (Ti), tantalum (Ta), niobium (Nb), hafnium (Hf), tungsten (W), yttrium (Y), zinc (Zn), zirconium (Zr), or aluminum (Al), or a compound containing one or more of such element(s). In preferred embodiments, the catalyst is a supported catalyst, the alkane is selected from the group consisting of ethane, propane, isobutane, n-butane and ethyl chloride, molecular oxygen is co-fed with the alkane to a reaction zone maintained at a temperature ranging from about 250° C. to about 350° C., and the ethane is oxidatively dehydrogenated to form the corresponding alkene with an alkane conversion of at least about 10% and an alkene selectivity of at least about 70%.

Abstract: A process for the preparation of a supported catalyst system, an inorganic carrier material being reacted with a metal compound of the formula M1(R1)r(R2)5(R3)t(R4)u  I in the presence of an inert solvent in a first step and, in a subsequent step, the suspension thus obtained being reacted with a metallocene complex and a compound forming metallocenium ions, in which process the solvent is not removed after the first step and the subsequent step is carried out without isolation of the pretreated carrier material thus obtained.

Abstract: A modified particles obtained by contacting particles(a) with a metal compound(b) selected from the group consisting of compounds of the Group VI, VII, XIV metal elements and compounds of the lanthanide series, and contacting the particles with a compound(c) having a functional group containing active hydrogen or a non-proton donative Lewis basic functional group and an electron-withdrawing group; a carrier composed of the modified particles; a catalyst component for olefin polymerization composed of said modified particles; a catalyst for olefin polymerization obtained by contacting the modified particles(A) and a transition metal compound(B), or further an organometallic compound(C); and a process for producing an olefin polymer with the catalyst.

Abstract: Ethylene is oligomerized with certain catalysts based on iron and cobalt complexes of 2,6-pyridinecarboxaldehydebis(imine) and 2,6-diacylpyridine-bis(imine) tridentate ligands.

Abstract: This invention provides a compositions that are useful for polymerizing at least one monomer into at least one polymer.

Abstract: The present invention provides novel anionic polymerization amine initiators having a tertiary amine group pendant to the polymer chain and processes for making the same. The initiators can be useful in the preparation of tertiary amine containing polymers, including linear, homotelechelic, heterotelechelic and radial polymers.

Abstract: A catalyst for the polymerization of vinylaromatic monomers, and particularly styrene, with a high yield and a high syndiotacticity index, comprises the product consisting of the following two components in contact with each other: A) an &eegr;5-cyclopentadienyl complex of titanium; B) an organo-oxygenated compound of aluminum; and contains a sufficient amount of at least one carboxylated product having the following general formula: R—COO—G  (I) wherein R—COO is a carboxylic group comprising the organic radical R having from 1 to 30 carbon atoms, and G represents a hydrogen atom, an aliphatic or aromatic hydrocarbon group having from 1 to 20 carbon atoms or a metal atom, possibly substituted, linked to said carboxylic group.

Abstract: A process is provided to produce a composition of matter. The process comprises contacting at least one organometal compound, at least one solid mixed oxide compound, and at least one organoaluminum compound to produce the composition.

Abstract: A metallocene catalyst is provided which comprises the product obtained by combining (a) a metallocene procatalyst, preferably one containing a bridging group possessing at least two bulky groups, and (b) a cation-generating cocatalyst. A process for activating a metallocene procatalyst is also provided which comprises combining the metallocene procatalyst with the components of a cation-generating cocatalyst.

Abstract: A cation-generating cocatalyst is provided for activating a metallocene procatalyst. The cocatalyst comprises (1) a metal- and/or metalloid-containing first component, e.g., an aluminum compound, (2) a neutral metal- and/or metalloid-containing second component, e.g., a borane compound, and (3) an anionic metal- and/or metalloid-containing third component, e.g., a metal containing borate.

Abstract: An active catalyst in the polymerization of alpha-olefins is obtained by:(i) bringing a dialkyl magnesium, or an alkyl magnesium halide into contact with a silicon or tin halide, in solution in an inert organic solvent, until a granular solid precipitates off;(ii) suspending said solid precipitate in an inert organic solvent and bringing it into contact with a compound which can be defined by the formula: ##STR1## wherein M represents a metal from Group IVB of the Periodic Table of Elements, and each R and C.sub.p has the meaning as reported in the disclosure, in order to form a granular solid catalyst; and(iii) recovering said solid catalyst from the resulting suspension.

Abstract: This invention provides compositions for polymerizing at least one monomer to produce a polymer. The compositions are produced by a process comprising contacting at least one organometal compound, at least one organoaluminum compound, and at least one treated solid oxide compound. The treated solid oxide compound is produced by a process comprising contacting at least one solid oxide compound with at least one electron-withdrawing anion source compound and at least one metal salt compound.

Abstract: A process to produce a composition is provided. Said process comprises: contacting a zeolite component, a silicon component, a Group 14 metal component, and a phosphorus component together to form a first mixture; treating said first mixture to form a second mixture; contacting said second mixture with a binder component to form a third mixture; agglomerating said third mixture to form a fourth mixture; and treating said fourth mixture to form said composition.

Abstract: The invention provides non-antimony containing polymerization catalysts for the condensation of polyesters. The catalyst is in the form of a clear chlorine and/or bromine containing solution of a metal glycoxide and a metal glycolate having a pH in the range of from 0 to about 1, and containing chlorine and/or bromine atoms at a number ratio of chlorine and/or bromine to total metal cations in the catalyst ranging from about 0.5:1 to about 3:1. Polyesters produced with this catalyst have improved melt elasticity, and higher melt viscosity. The former property is desirable for the preparation of large and complex shaped polyester containers, and the latter property is desirable for melt spinning of industrial grade fibers and tire cords.

Abstract: A method of making a solid, substantially dry olefin polymerization procatalyst precursor is disclosed whereby a solid precursor containing magnesium and titanium is formed in a slurry or solution, the solid then is separated from the solution and then dried at a temperature above 50.degree. C. for over an hour. Solid, substantially dry olefin polymerization procatalyst precursors made by the method also are disclosed, whereby the precursors are easier to handle, have better flowability, reduced clumpness and provide catalysts that can be used to produce polymers having improved extrudability, less filter clogging, less "talc"-like polymer particles of <10 micron in size and reduced polymer product segregation in storage.

Abstract: A supported catalyst for the (co)polymerization of alpha-olefins is obtained by putting the following products in contact with each other:(A) a metallocene derivative of a metal selected from the group consisting of transition metals and lanthanides, which is in itself capable of promoting the polymerization of alpha-olefins in the presence of or also without suitable activators;(B) an active support containing magnesium, halogen, titanium and smaller quantities of tin;(C) an organometal derivative of aluminium of which at least 50% of the aluminium atoms are bound to at least one alkyl carbon atom.Components (A) and (B) are preferably interacted first to obtain a supported metallocene derivative, which is then put in contact with (C) to obtain the desired catalyst. Alternatively, (B) and (C) are interacted and subsequently put in contact with (A).

Abstract: An catalyst composition for preparing high-syndiotacticity polystyrene polymers which comprises: (a) a titanium complex represented by the following formula of TiR'.sub.1 R'.sub.2 R'.sub.3 R'.sub.4 or TiR'.sub.1 R'.sub.2 R'.sub.3, wherein R'.sub.1, R'.sub.2, R'.sub.3, and R'.sub.4 are, independently, an alkyl group, an aryl group, an alkoxy group, an aryloxy group, an amino group, a hydrogen atom, or a halogen atom; (b) a cyclopentadienyl complex of silicon (Si), germanium (Ge), or tin (Sn) represented by the following formula: ##STR1## wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4 and R.sub.

Abstract: The invention relates to the use of intramolecularly stabilized organometallic compounds as components in coordination catalyst systems, corresponding coordination catalyst systems and processes for the preparation of polymers by coordination polymerization of unsaturated hydrocarbons by catalysed metathesis of alkenes and alkynes using such coordination catalyst systems.

Abstract: A supported catalyst component comprising (a) a support material, an organometal compound, and (b) an activator compound comprising b.1) a cation which is capable of reacting with a transition metal metallocene compound to form a catalytically active transition metal complex, and b.2) a compatible anion having up to 100 nonhydrogen atoms and containing at least one substituent comprising an active hydrogen moiety; a supported catalyst comprising the supported catalyst component and a transition metal compound; process for making the same; an addition polymerization process using the supported catalyst; complex compounds, and a method for preparing the same.

Abstract: Process for the preparation of crystalline vinylaromatic polymers with a high degree of syndiotacticity which comprises polymerizing vinylaromatic monomers in the presence of a catalytic system essentially consisting of:a) a complex of titanium selected from those having the general formula:(CpR.sub.1 R.sub.2 R.sub.3 R.sub.4 R.sub.5)TiX.sub.3 (I)wherein the groups R.sub.1, R.sub.2, R.sub.3, R.sub.4 and R.sub.5 represent a hydrogen atom or C.sub.1 -C.sub.10 alkyl groups;X represents a hydrogen atom, a halogen such as chlorine, a C.sub.1 -C.sub.10 alkyl or oxyalkyl radical or a C.sub.6 -C.sub.12 oxyaryl radical;b) an alkylaluminoxane; andc) an organic derivative of tin;characterized in that the alkylaluminoxane is methylaluminoxane (MAO) treated at 20.degree.-80.degree. C. under vacuum for 1-100 hours and the organic derivative of tin is tin tetraphenyl.

Abstract: A catalyst for the (co)polymerization of ethylene is obtained by a process comprising the contact of the following components (A), (B), (C) and (D) in the respective molar ratios (1):(0.5-2):(0-25):(0-15):(A): a bivalent arene of titanium having the formulaTi (.eta..sup.6 -arene)(AlR.sub.x X.sub.4-x).sub.2 ;wherein: "arene" indicates benzene, or benzene substituted with from 1 to 6 C.sub.1 -C.sub.10 alkyl groups;each X independently represents a chlorine, bromine or fluorine atom;R is a C.sub.1 C.sub.10 alkyl group, linear or branched; "x" is a number varying from 0.5 to 2.

Abstract: A functionalized polymer comprising a polymeric segment, having at least one cyclic amine end group, defined according to formula (I) ##STR1## where Z is an anionically-polymerized polymer; R.sub.1 is selected from the group consisting of organic groups containing from 1 to about 12 carbon atoms and a bridging bond; each R.sub.2 is independently selected from the group consisting of hydrogen, organic groups containing from 1 to about 12 carbon atoms, and a bridging bond; each R.sub.3 is independently selected from the group consisting of hydrogen and organic groups containing from 1 to about 12 carbon atoms; a is an integer from 4 to about 16; and b is an integer from 0 to about 12; and optionally including a bridge, formed by the selection of two of said bridging bonds, the bridge having 0 to about 6 carbon atoms between the bridging ring members; said polymer having been crosslinked. Also provided are vulcanizable compositions of matter, vulcanizates, and tires of the functionalized polymers.

Abstract: An oligomerization catalyst according to the invention comprises a nickel compound (A); an organophosphoric compound (B); an organoaluminum compound (C); and a compound of the group consisting of carbon-halogen bond-containing compounds, oxoacid and salts thereof, sulfonic acid and derivatives thereof, and compounds of any of the formulae QX.sup.4.sub.n, QR.sub.n, QR'.sub.n, QX.sup.4.sub.1 R.sub.m, QX.sup.4.sub.1 R'.sub.m, QR.sub.1 R'.sub.m, Q.sup.1 (BR.sub.4).sub.p and R"(BR.sub.4) wherein Q is an element of the group consisting of Mg, Ti, Zr, B and Sn, Q.sup.1 is an element of the group consisting of Li, Na, K, Ca and Zn, X.sup.4 is a halogen or hydrogen atom, R is a C.sub.1 -C.sub.12 hydrocarbon group, R' is a C.sub.1 -C.sub.12 oxygen-containing hydrocarbon group, R" is a C.sub.1 -C.sub.20 hydrocarbon group or an ammonium group, n is a valence of Q, l, m is a natural member that satisfied n=l+m, and p is a valence of Q.sup.1. This catalyst is useful for the production of alpha-olefinic oligomers.

Abstract: Process for the preparation of crystalline vinylaromatic polymers with a predominantly syndiotactic structure which comprises polymerizing vinylaromatic monomers, alone or mixed with at least one other monomer, in the presence of a catalytic system essentially consisting of:a) a complex of titanium or zirconium selected from those having general formula:MR.sub.1 R.sub.2 R.sub.3 R.sub.4, A.sub.1 MR.sub.1 R.sub.2 R.sub.3, A.sub.1 A.sub.2 MR.sub.1 R.sub.2 (I)b) a co-catalyst selected from an alkylalumoxane and a compound of boron having formula (II):BX.sub.1 X.sub.2 X.sub.3 (II)or one of its salts;c) a derivative of tin having general formula:SnR.sub.5 R.sub.6 R.sub.7 R.sub.

Abstract: An catalyst composition for preparing high-syndiotacticity polystyrene polymers which comprises: (a) a titanium complex represented by the following formula of TiR'.sub.1 R'.sub.2 R'.sub.3 R'.sub.4 or TiR'.sub.1 R'.sub.2 R'.sub.3, wherein R'.sub.1, R'.sub.2, R'.sub.3, and R'.sub.4 are, independently, an alkyl group, an aryl group, an alkoxy group, an aryloxy group, an amino group, a hydrogen atom, or a halogen atom; (b) a cyclopentadienyl complex of silicon (Si), germanium (Ge), or tin (Sn) represented by the following formula: ##STR1## wherein R.sub.1, R.sub.2, R.sub.3, and R.sub.

Abstract: Disclosed in an olefin polymerization catalyst comprising a transition metal compound having at least two transition metals in which at least one of said metals is bonded to a ligand having a cyclopentadienyl skeleton, at least one of said metals is selected from Sc, Y, Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W and lanthanoid metals and at least on of the others is selected from the specific transition metals; and an organoaluminum oxy-compound or an organoboron compound. Corresponding to the kind of the metal combined with said metal selected from Sc, Y, Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W and lanthanoid metals, the olefin polymerization catalyst exhibit a property to give polymers having a wide molecular weight distribution in spite of the catalyst system using one kind of a transition metal compound, or to give polymers having high molecular weight and be excellent in the polymerization activity at low polymerization temperature.

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: Catalysts useful in olefin polymerization are a mixture of (a) (i) one or more compounds Zn(X.sup.1).sub.2 and one or more compounds Al(R.sup.1).sub.3, or (ii) Zn(X.sup.1).sub.2.2Al(R.sup.1).sub.3, wherein X.sup.1 is halide and R.sup.1 is C.sub.1-12 hydrocarbyl; and (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 can contain (c) one or more of M(R.sup.5).sub.e (X.sup.5).sub.3-e, Al.sub.2 (R.sup.5).sub.3 (X.sup.5).sub.3 or Mg(R.sup.6).sub.f Y.sub.2-f, wherein X.sup.1 and X.sup.2 are halide, R.sup.1, R.sup.5, R.sup.6 and R.sup.9 are C.sub.1- 12 hydrocarbyl, M is Al or B, e is 0-3, Y is halide, O--(C.sub.1-12 hydrocarbyl) or N(SiR.sup.9.sub.3).sub.2, and f is 0-2.

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: Syndiotactic polystyrene is produced in the presence of a catalyst comprising:(i) trimethylaluminum,(ii) at least one of the organotin compounds with general formulae:R.sub.1 R.sub.2 R.sub.3 Sn--O--SnR.sub.4 R.sub.5 R.sub.6or R.sub.1 R.sub.2 R.sub.3 Sn--OHor R.sub.1 R.sub.2 SnOor R.sub.1 Sn(O)OH;wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5 and R.sub.6 are the same or different C.sub.1 -C.sub.20 alkyl groups or aryl groups or alkylaryl groups,(iii) one or several derivatives of transition metals having the formula Cp.sub.n MA.sub.m-n, wherein M is a metal selected from the group of titanium, zirconium and hafnium, Cp is a cyclopentadienyl or a substituted cyclopentadienyl group; n is 0, 1 or 2; m is 4 or 3; and A is selected from the group consisting of a halogen, hydrogen, or an oxyhydrocarbyl group OR', wherein R' is a C.sub.1 -C.sub.6 linear or branched alkyl group, a substituted or non-substituted aryl group, or an arylalkyl group.

Abstract: Solid component of catalyst for the (co)polymerization of ethylene, including magnesium, halogen and titanium, obtained by:(i) dissolution, in an inert organic solvent, of a magnesium dialkyl, or a magnesium alkyl halide, a tin halide (IV) and possibly also an alkyl halide and their contact until a granular solid precipitates from the solution;(ii) contact of said granular solid and its interaction with a titanium halide, alkoxide or halo-alkoxide, to form a solid component of catalyst.

Abstract: A catalyst composition for polymerizing alpha-olefins is prepared by treating a carrier with a mixture of at least one organomagnesium composition of the formula(OR').sub.n Mg(OR).sub.m (I)where R and R' are the same or different C.sub.1 -C.sub.12 hydrocarbyl groups, m and n are each 0, 1 or 2, m+n=valence of Mg, and a compound of the formulaMX.sub.p (II)where M is Si, C, Ge or Sn, X is Cl or Br, and p is the valence of M, in a solvent capable of dissolving the mixture. The product of this step may or may not be dried. Subsequently, it is contacted with a transition metal compound.The polymer resins produced with the resulting catalyst have relatively narrow molecular weight distribution and high melt index values.

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 catalyst, a process of forming the catalyst, and polymerizing at least one alpha-olefin with the catalyst, said catalyst produced by precipitating a composition from a solution of a metal halide, for example, magnesium dihalide, and a transition metal compound, for example, titanium tetraalkoxide, in the presence of a particulate diluent, for example, polymeric fibrils, with an agent selected from among specified organometallic compounds, metal halides and oxygen-containing metal halides, hydrogen halides and organic acid halides. The composition is preferably further treated with a halide ion exchanging source, for example, titanium tetrahalide to form a particularly active catalyst. The catalyst is preferably used in combination with a cocatalyst comprising a metal hydride or organometallic compound selected from an element of Periodic Groups IA, IIA and IIIA.

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

Abstract: A process for the homopolymerization or copolymerization of olefins is disclosed, which is carried out in the presence of an improved catalyst comprising a solid catalyst component and an organometal compound, said solid catalyst component being obtained by the reaction of: (a) a magnesium halide, (b) a compound represented by the formula: Me(OR).sub.n X.sub.z-n where Me is any of the Group I-VIII elements of the Periodic Table, excluding Al, Si, Ti and V, R is a hydrocarbon residual group having 1-24 carbon atoms, X is a halogen atom, z represents the valence of Me and n is 0<n.ltoreq.z, and (c) a compound represented by the formula: Si(OR').sub.m X.sub.4-m where R' is a hydrocarbon residual group having 1-20 carbon atoms, X is a halogen atom, and m is 0.ltoreq.m.ltoreq.4, and (d) a titanium compound and/or a vanadium compound. The resulting polymers are characterized by a large bulk density, a narrow range of molecular weight distribution, and small amounts of hexane extraction.

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

Abstract: An improved titanium catalyst is produced by contacting a titanium tetrahalide such as TiCl.sub.4 with a catalyst precursor prepared by reacting a treating compound selected from mercaptans and tin hydroxides with an organometal such as a dialkyl magnesium compound. The resulting catalyst can either be supported or unsupported and it has been found to give high productivity and good particle size control in the production of olefin polymer such as polyethylene and also found to give a broad spectrum of molecular weight polymers including polymers having ultra high molecular weight and also narrow distribution polymers particularly suited for injection molding.

Abstract: A catalyst useful for polymerizing olefins which comprises a solid catalyst component [A] and an organometallic component [B], the solid catalyst component [A] being obtained by reacting (1) an organometallic compound with (2) a transition metal compound selected from the group consisting of a titanium compound, a vanadium compound, a mixture of a titanium compound and a vanadium compound and a mixture of a titanium compound and a zirconium compound, in the presence of (3) a solid reaction product of (a) an organomagnesium compound of the formulaM.sub..alpha. MgR.sub.p X.sub.q.D.sub.rwherein.alpha., p, q and r each independently is 0 or a number greater than 0,p+q=m.alpha.+20.ltoreq.q/(.alpha.