Abstract: A process of using a catalyst composition to polymerize at least one monomer to produce a polymer. The process comprises contacting the catalyst composition and at least one monomer in a polymerization zone under polymerization conditions to produce the polymer. The catalyst composition is produced by a process comprising contacting at least one organometal compound, at least one treated solid oxide compound, and at least one organoaluminum compound.

Abstract: A novel continuous gas phase polymerization process for producing polyethylene and interpolymers of ethylene and at least one other olefin is provided wherein a non-aromatic halogenated hydrocarbon(s) is used in a specified amount such that the activity of the titanium, zirconium and/or hafnium containing Ziegler-Natta catalyst is increased.

Abstract: A process for polymerization of vinyl monomers is described comprising polymerizing vinyl monomers in the presence of an initiating system comprising (i) an organic iodide, organic bromide, organic chloride, or an organic sulfur initiator compound, and (ii) a layered material catalyst, and wherein when the initiator compound comprises an organic bromide or organic chloride compound, the initiating system further comprises an iodide or sulfur containing salt compound or a transition metal salt. The present invention provides a novel method for living polymerization of vinyl monomers, which provides a high level of macromolecular control over the polymerization process and which leads to uniform and controllable polymeric products, which may include well-defined structures and complex architectures.

Abstract: By controlling the hold up times, concentrations and temperatures for mixing the components of aluminum, titanium and magnesium based catalyst for solution polymerization it is possible to prepare a catalyst having a high activity, which prepares high molecular weight polyolefins. Generally, a catalyst loses activity and produces lower molecular weight polymer at higher temperatures. The catalyst of the present invention permits comparable polymers to be produced with higher catalyst activity and at higher reaction temperatures by increasing the concentration of the components used during the preparation of the catalyst.

Abstract: In accordance with the present invention, there is provided a process for producing a polymer by a living radical polymerization method which is also applicable to the polymerization of a methacrylate monomer, and a methacrylate-based polymer having a narrow molecular weight distribution which is produced by the above process. Specifically, the present invention relates to a process for producing a methacrylate-based polymer by a atom transfer radical polymerization method in which a polymerizable monomer containing at least one methacrylate monomer is polymerized in the presence of a redox catalyst comprising a metal complex containing at least one transition metal as a central metal selected from the group consisting of elements of Groups 7 to 11 of the Periodic Table, using an organohalogen compound or a halogenated sulfonyl compound as a polymerization initiator.

Abstract: The present invention relates to a process for the polymerization of olefins using catalyst components and catalysts obtained therefrom comprising Ti, Mg, halogen and an electron donor compound selected from heteroatoms containing esters of malonic acids. The catalysts are particularly suitable for the sterospecific polymermerization of olefins having high isotactic index expressed in terms of high xylene insolubility.

Abstract: A novel continuous gas phase polymerization process for producing polyethylene and interpolymers of ethylene and at least one other olefin is provided wherein a non-aromatic halogenated hydrocarbon is used in a specified amount such that the activity of the titanium, zirconium and/or hafnium containing Ziegler-Natta catalyst is increased.

Abstract: A novel continuous gas phase polymerization process for producing polyethylene and interpolymers of ethylene and at least one other olefin is provided wherein a saturated halogenated hydrocarbon is used in a specified amount such that the activity of the titanium containing Ziegler-Natta catalyst is increased.

Abstract: A novel continuous gas phase polymerization process for producing polyethylene and interpolymers of ethylene and at least one other olefin is provided wherein chloroform is used in a specified amount such that the activity of the titanium containing Ziegler-Natta catalyst is increased.

Abstract: A new polymerization process (atom transfer radical polymerization, or ATRP) based on a redox reaction between a transition metal (e.g., Cu(I)/Cu(II), provides “living” or controlled radical polymerization of styrene, (meth)acrylates, and other radically polymerizable monomers. Using various simple organic halides as model halogen atom transfer precursors (initiators) and transition metal complexes as a model halogen atom transfer promoters (catalysts), a “living” radical polymerization affords (co)polymers having the predetermined number average molecular weight by &Dgr;[M]/[I]0 (up to Mn>105) and a surprisingly narrow molecular weight distribution (Mw/Mn), as low as 1.15. The participation of free radical intermediates in ATRP is supported by end-group analysis and stereochemistry of the polymerization. In addition, polymers with various topologies (e.g.

Abstract: An organometallic composition of a reaction product of a fluorinated organic compound of formula (I): wherein R1 to R8 are as described in the specification, m is 0 or 1; and an organometallic compound of formula (II): M′RnX(p−n)  (II) wherein M′, R, X, n and p are as described in the specification; a polymerization catalyst composition using the above organometallic composition and a metallocene complex a method of making the catalyst composition and using the catalyst composition to polymerize &agr;-olefins.

Abstract: The present invention provides a process for preparing a substantially amorphous poly-&agr;-olefin, which includes: a) preforming a solid catalyst and, optionally, a first amount of a trialkylaluminum cocatalyst, by contacting the catalyst and optionally the cocatalyst with at least one selected from the group including oxygen and a compound which includes active oxygen, to form a preformed catalyst, wherein the solid catalyst includes magnesium, aluminum and titanium, and wherein said trialkylaluminum cocatalyst includes 1 to 9 carbon atoms in each alkyl group; b) contacting the preformed catalyst with a second amount of the cocatalyst, wherein a molar ratio of trialkylaluminum to the titanium ranges from 40:1 to 700:1, to form a catalyst mixture; c) polymerizing, in the liquid phase, with the catalyst mixture, an olefin or an olefin mixture at a temperature between 30 and 160° C., to produce the poly-&agr;-olefin.

Abstract: A catalyst composition that is the combination of or the reaction product of ingredients comprising (a) (i) a halogen-containing iron compound or (ii) an iron-containing compound and a halogen-containing compound, (b) a silyl phosphonate, and (c) an organoaluminum compound.

Abstract: A novel process for producing homopolymers and interpolymers of olefins which involves contacting an olefin and/or an olefin and at least one or more other olefin(s) under polymerization conditions with a Ziegler-Natta catalyst comprising at least one transition metal compound and at least one organometallic co-catalyst compound and tetrahydrofuran in amounts sufficient to reduce the electrostatic charge in the polymerization medium. Also disclosed is a process for reducing electrostatic charge in an olefin polymerization medium.

Abstract: A process for production of an ethylene-propylene-diene-methylene (EPDM) tetrapolymer having long chain branching is described. The process comprises the step of polymerizing a monomer mixture comprising ethylene, propylene, a first diolefin monomer containing one polymerizable double bond (preferably ENB) and a second diolefin containing two polymerizable double bonds (preferably VNB) in the presence of a catalyst system. The catalyst system comprises: a catalyst comprising a compound containing vanadium +3 with the proviso that the compound does not comprise a halogen directly bound to the vanadium; a halogenated organoaluminum cocatalyst having a halogen to aluminum molar ratio in the range of from about 1 to about 2; and an activator. The branched polymer product of the present process exhibits a molecular weight distribution of less than about 3.5 and improved rheological properties and enhanced processability characteristics.

Abstract: The molecular weight of polyolefins produced using selected late transition metal complexes of bidentate ligands may be lowered by carrying out the polymerization in the presence of hydrogen, a selected silane, or CBr4.

Abstract: A novel process for producing homopolymers and interpolymers of olefins which involves contacting an olefin and/or an olefin and at least one or more other olefin(s) under polymerization conditions with an olefin polymerization catalyst and at least one ether comprising at least one carbon-oxygen-carbon linkage (C—O—C) of the formula R1—O(—R2—O)m—R3 in amounts sufficient to reduce the electrostatic charge in the polymerization medium. Also disclosed is a process for reducing electrostatic charge in an olefin polymerization medium.

Abstract: A novel process for producing homopolymers and interpolymers of olefins which involves contacting an olefin and/or an olefin and at least one or more other olefin(s) under polymerization conditions with at least one Ziegler-Natta catalyst comprising a component comprising at least one transition metal and a co-catalyst comprising at least one organometallic compound and at least one compound comprising at least one carbon-oxygen-carbon linkage (C—O—C) of the formula R1—O(—R2—O)m—R3 in amounts sufficient to reduce the electrostatic charge in the polymerization medium. Also disclosed is a process for reducing electrostatic charge in an olefin polymerization medium.

Abstract: A novel process for the polymerization of olefins is provided. The process involves contacting at least one olefin with a Ziegler-Natta catalyst in the presence of dinitrogen monoxide in the production of polymeric products having a narrower molecular weight distribution. A process for narrowing molecular weight distribution of polyolefins utilizing dinitrogen monoxide is also provided.

Abstract: Process for the preparation of EP(D)M elastomeric copolymers in liquid phase, preferably in suspension of a liquid monomer, in the presence of a catalyst essentially consisting of a Vanadium compound, a cocatalyst essentially consisting of an Aluminium trialkyl, and optionally an activator, characterized in that the Aluminium trialkyl is essentially Aluminium trimethyl and the Vanadium compound, as such or prepolymerized, is selected from: (a) compounds having general formula (I) VO(L)n(X)m wherein n is an integer from 1 to 3 and m is from zero to 2, n+m being equal to 2 or 3; (b) compounds having general formula (II) V(L)p(X)q wherein p is an integer from 1 to 4, q is from 0 to 3, the sum of p+q being equal to 3 or 4; wherein L is a bidentate ligand deriving from a 1,3-diketone and X is a halogen, preferably Chlorine.

Abstract: A novel process for producing homopolymers and interpolymers of olefins which involves contacting an olefin and/or an olefin and at least one or more other olefin(s) under polymerization conditions with a Ziegler-Natta catalyst and dinitrogen monoxide in an amount sufficient to reduce the electrostatic charge in the polymerization medium. Also provided is a process for reducing electrostatic charge in the polymerization of an olefin by adding dinitrogen monoxide.

Abstract: A novel process for producing homopolymers and interpolymers of olefins which involves contacting an olefin and/or an olefin and at least one or more other olefin(s) under polymerization conditions with an olefin polymerization catalyst and dinitrogen monoxide in an amount sufficient to reduce the electrostatic charge in the polymerization medium. Also provided is a process for reducing electrostatic charge in the polymerization of an olefin by adding dinitrogen monoxide.

Abstract: The present invention relates to a catalyst system comprising: a) an organoaluminum compound, b) a metal compound selected from subgroups IV to VI of the periodic system, c) a reactivator in a molar ratio of 0.5 to 100 relative to compound b), wherein said reactivator comprises a characterized in that a mono- or dihalocarboxylic acid alkyl ester of the following formula: wherein X is a C1-6 alkyl or C1-6 alkoxy group, Y is Cl, Br or H, Z is Cl or Br and R is a C1-6 alkyl group.

Abstract: The present invention relates to a process for polymerizing at least one olefin with the aid of a catalyst containing at least one organometallic compound of a transition metal possessing at least one ligand of cyclopentadienyl or substituted cyclopentadienyl type. The polymerization is carried out in gas phase or in suspension in a liquid polymerization medium selected amongst saturated or unsaturated hydrocarbons, in the presence of hydrogen and a polymerization component selected amongst halogenated hydrocarbons. The combined use of hydrogen and halogenated hydrocarbon in such a polymerization process simultaneously improves the catalyst activity and the molecular weight control of the polymer.

Abstract: The novel synthetic polyethylene fluids of the present invention are characterized by high viscosity indices (about 94-151 VI), low pour points (about -60 to -10.degree. C.), and a kinematic viscosity of about 6 to 28 cSt KV at 100.degree. C. The product compositions comprise polymers having a molecular weight of from about 300 to 30,000 and a high branching index of 151 to 586 branches per 1000 CH.sub.2 groups, or BI=0.18-0.40, wherein the polymer is substantially free of methyl branches. Highly-branched polyethylene fluids that have less than 5 methyl branches per 1000 CH.sub.2 groups are prepared by polymerizing ethylene in the presence of a catalyst system consisting of [C] and [B], wherein [C] is a catalyst having the empirical formula MX.sub.4 and [B] is a co-catalyst having the empirical formula R.sub.n AlX.sub.3-n, where M is a Group IVB transition metal, X is a halogen anion, R is a C.sub.1 -C.sub.

Abstract: The present invention provides a Ziegler-Natta catalyst based on titanium and vanadium useful in solution processes for the polymerization of olefins having a low amount of aluminum and magnesium. The catalysts of the present invention have a molar ratio of magnesium to the first aluminum component from 4.0:1 to 8.0:1 and molar ratio of magnesium to titanium and vanadium from 4.0:1 to 8.0:1. The invention provides a novel catalyst preparation method to substantially increase the polymer molecular weight in the high temperature ethylene polymerization process.

Abstract: The novel synthetic polyethylene fluids of the present invention are characterized by high viscosity indices (about 94-151 VI), low pour points (about -60 to -10.degree. C.), and a kinematic viscosity of about 6 to 28 cSt KV at 100.degree. C. The product compositions comprise polymers having a molecular weight of from about 300 to about 30,000 and a branching index of 151 to 586 branches per 1000 CH.sub.2 groups, or BI=0.18-0.40. A process for preparing such novel synthetic polyethylene fluids comprises polymerizing ethylene in the presence of a catalyst system, said catalyst system comprising [A] and [B], wherein [A] is a catalyst having the formula MX.sub.5 and [B] is a co-catalyst having the formula R.sub.n AlX.sub.3-n where M is a Group VB, VIB, or VIII transition metal; X is a halogen anion; R is a C.sub.1 -C.sub.20 alkyl group; and n is 1-2.

Abstract: Process for preparing copolymers of aromatic vinyl compounds at -80 to 150.degree. C. in the presence of metallocene catalyst systems using a corotating, closely intermeshing twin-screw extruder for polymerization.

Abstract: Transition metal complexes of the formula IL.sub.m MX.sub.n I,whereL is a ligand of the formula II ##STR1## m is 1 or 2, M is a titanium, zirconium, hafnium, vanadium, niobium, tantalum, or a rare earth metal,X is fluorine, chlorine, bromine, iodine, hydrogen, C.sub.1 -C.sub.10 -alkyl, C.sub.6 -C.sub.15 -aryl or OR.sup.1,n is 1, 2, 3, or 4 as defined herein, andR.sup.1, R.sup.2, R.sup.3, R.sup.4, and A are as defined herein,and the use of these complexes as catalysts for olefin polymerization are described herein.

Abstract: The invention relates to the preparation of the disclosed catalyst system and to the homo- or copolymerization of ethylene with the aid of this catalyst system. The catalyst system contains a catalyst A and a cocatalyst B which, system is suitable for the homopolymerization of ethylene or copolymerization of ethylene with one or more .alpha.-olefins having 3-12 carbon atoms and optionally one or more non-conjugated dienes. Catalyst A contains one or more organomagnesium compounds, one or more transition metal compounds, and one or more halides that do not react spontaneously with the organomagnesium compound(s). The catalyst system also contains at least one transfer agent.

Abstract: This invention relates to an initiator system for the polymerization of isoolefins having 4 to 16 carbon atoms, optionally with monomers polymerizable with isoolefins, the system consisting of or one or more aromatic or heteroaromatic, polycyclic hydrocarbons and an aged, organic solution of vanadium tetrachloride, wherein the concentration of the vanadium tetrachloride is 0.01 mmol to 500 mmol per liter of solvent and the molar ratio of aged vanadium tetrachloride to polycyclic hydrocarbons is in the range from 100:1 to 1:100.It is possible by means of the initiator system according to the invention to produce polyisoolefins, in particular butyl rubbers, at relatively high temperatures with only a low gel content and of a sufficiently high molecular weight.

Abstract: There is provided process for producing an ethylene-alpha-olefin polymer at a polymerization reaction temperature in excess of the softening temperature of the polymer in a gas-phase fluidized-bed reactor in the presence of a polymerization catalyst and wherein the polymerization reaction is conducted in the presence of an inert particulate material, the improvement comprising: commencing polymerization by polymerizing an ethylene propylene rubber having a crystallinity ranging from about 4 to 18 percent as measured by differential scanning calorimetry.

Abstract: The present invention relates to a process for (co-)polymerizing olefin(s) comprising introducing into a polymerization medium the olefin(s), a titanium-based catalyst of Ziegler-Natta type, an organometallic cocatalyst and a halogenated hydrocarbon compound in an amount effective for increasing the catalyst activity in the (co-)polymerization, the amount being such that the molar ratio of the quantity of the halogenated hydrocarbon compound to that of titanium is comprised between 0.01 and 0.1, or between 0.001 and 0.15 when the (co-)polymerization is carried out continuously. The process is particularly useful in a continuous gas-phase (co-)polymerisation of olefin(s).

Abstract: A solid catalyst component (A1) for polymerization of olefins prepared by contact with a solid component (d) obtained by allowing (1) a solid component (a) obtained by allowing (i) a dialkoxymagnesium or diaryloxymagnesium, (ii) a titanium compound and (iii) a diester of aromatic dicarboxylic acid to come in contact with one another and (2) a solid component (b) obtained by allowing (i) a dialkoxymagnesium or diaryloxymagnesium, (ii) a titanium compound, (iii) a diester of aromatic dicarboxylic acid and (iv) a polysiloxane to come in contact with one another, to come in contact with each other, or a solid catalyst component (A2) for polymerization of olefins prepared by allowing said solid component (a) and (3) a solid component (d) obtained by allowing (i) a dialkoxymagnesium or diaryloxymagnesium, (ii) a titanium compound, (iii) a diester of aromatic dicarboxylic acid, (iv) a polysiloxane and (v) an aluminum compound to come in contact with one another, to come in contact with each other.

Abstract: Catalysts component of the (co)polymerization of alpha-olefins CH.sub.2 .dbd.CHR, wherein R is hydrogen or an alkyl radical having from 1 to 8 carbon atoms, comprising a product of the composition:VCL.sub.y.z(b)wherein (b) represents an organic compound selected from alkyl, aryl and acyl halides, y is a number higher than 2 and lower than 4, and preferably comprised between 2.5 and 3.5 and z is a number higher than zero and lower than or equal to 2, and preferably between 0.002 and 1. Components can be obtained as products of the reaction, carried out at temperatures higher than 10.degree. C., between VCl.sub.4 and the compound (b). Particularly preferred among compounds (b) are benzoyl chloride, p-methoxybenzoyl chloride and p-chloro benzoyl chloride. From the components of the invention, either supported or not, catalysts having high activity particularly useful for the production of ethylene polymers showing broad molecular weight distribution can be prepared.

Abstract: A high cis-1,4-polybutadiene is produced, with reduced gel formation, by preparing a catalyst from (A) a cobalt compound, (B) a trialkyl (C.sub.1-10) aluminum compound, (C) a halide compound selected from those of formulae (1) and (2): (1) AlR.sup.2.sub.m X.sub.3-m, and (2) R.sup.3 --X, wherein R.sup.2 =C.sub.1-10 hydrocarbon, X=halogen, m=0 to 2, R.sup.3 =C.sub.1-40 hydrocarbon, and (D) water in an amount of 0.77 to 1.45 moles per mole of total Al in components (B) and (C); and polymerizing 1,3-butadiene in the presence of the resultant catalyst in a polymerization medium including an alkane, cycloalkane and/or olefin hydrocarbon.

Abstract: The present invention relates to an ethylene polymerization process carried out with the aid of a catalyst system of the Ziegler-Natta type consisting essentially of titanium, halogen and magnesium. The process is performed such that the ethylene polymerization takes place in the presence of a polychlorinated saturated hydrocarbon compound. The halogenated hydrocarbon compound is used in a quantity such that the molar ratio of the halogenated hydrocarbon compound to titanium of the catalyst is in the range from 0.01 to 1.8. Preferably the halogenated hydrocarbon compound is chloroform or trichloro-1,1-ethane.

Abstract: Process for preparing a poly-1-olefinBy means of a highly active spherical Ziegler catalyst based on a dialkylmagnesium, spherical polymers can be obtained in the polymerization of alpha-olefins. A further advantage of the catalyst of the invention lies in the high catalyst activity, so that only very small amounts of the catalyst are required for the polymerization. The residual titanium and/or zirconium content in the polymers prepared according to the invention is less than 10 ppm. Owing to its good responsiveness to hydrogen, the catalyst is particularly suited to two-stage processes for preparing polymers having a broad bimodal molecular weight distribution. The replacement of sulfur-containing electron donors such as diethyl sulfite by alcohols such as ethanol leads to less odor problems and broadened opportunities for use of the polymer.

Abstract: A colorable resin particle having an outer shell of a non-sticky polymer and an inner core of a sticky polymer produced in a gas phase fluidized bed reactor at or above the sticking temperature of the sticky polymer using a non-sticky prepolymerized catalyst and processes for producing the colorable resin and the non-sticky prepolymerized catalyst.

Abstract: Process with two or more steps for the preparation in suspension of mixtures of ethylene-propylene (EPM) elastomer homopolymers or ethylene-propylene-diene (EPDM) elastomer terpolymers in the presence of a catalytic system essentially consisting of a compound of Vanadium and a cocatalyst essentially consisting of an Aluminum alkyl and in the presence of an activator, the above process being characterized in that:a) in the first step a first polymerization of the monomers is carried out in the presence of the Vanadium based catalyst;b) in the second or subsequent steps further polymerizable monomers and activator are added to the suspension of the polymer obtained in step (a).

Abstract: A process for polymerizing C.sub.2 -C.sub.10 -alk-1-enes in the presence of a metallocene complex of the formula I ##STR1## where the substituent groups have the meanings described in the specification.

Abstract: The present invention relates to a process for efficiently producing an aromatic vinyl compound-based copolymer having a high degree of syndiotactic configuration in its aromatic vinyl chain by copolymerizing an aromatic vinyl compound with an olefin, etc. in the presence of a catalyst comprising (A) a transition metal compound, (B) an ionic compound comprising a non-coordinate anion and a cation of a typical metal belonging to the group 4 and (C) a Lewis acid to be used as the case may be. It is made possible by the use of the highly active catalyst according to the above process to efficiently produce an aromatic vinyl compound-based copolymer which is minimized in residual amounts of ash and toxic substances a high degree of syndiotactic configuration in its aromatic vinyl chain, while dispensing with an expensive aluminoxane.

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: 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: This catalyst has the general formula VX.sub.3, mAIX.sub.3, nZ, wherein X is a halogen atom, Z is at least one at least partially halogenated, branched or unbranched, saturated hydrocarbon, m is between 0.1 and 10, and n is between 1 and 300. To prepare it, a vanadium halide VX.sub.2 and/or VX.sub.3 is coground with an aluminum halide AlX.sub.3, and then at least one halogenated hydrocarbon Z is added to the mixture obtained in proportions corresponding to the chosen values of m and n. The invention also relates to the (co)polymerization of alpha-olefins at 20.degree.-350.degree. C. in the presence of a catalyst system comprising at least one catalyst as defined above and at least one organometallic activator.

Abstract: A process is disclosed for the polymerization of olefins, using (i) a catalyst and (ii) an organometallic activator from Groups I, II or III of the Periodic Table at temperatures between 20.degree. and 250.degree. C., and pressure up to 200 bar, in solution, or in suspension in an inert liquid hydrocarbon, at temperatures between 160.degree. and 350.degree. C., under pressures of between 400 and 3000 bar, in a continuous manner in a reactor where the mean residence time of the catalyst is between 1 and 150 seconds. The catalyst comprises at least one titanium compound, at least one halogen-containing organoaluminum compound and at least one inorganic magnesium compound in suspension in at least one .alpha.,.omega.-dihaloalkane. The titanium compound is essentially a titanium (III) compound, the total content of titanium (II) and titanium (IV) being less than or equal to 15% of the total content of titanium.

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: The present invention relates to a method for activating coordination catalysts suitable for the polymerization of alpha olefins using a alkoxy aluminum alkyl compound prepared by mixing an alcohol and an alkyl aluminum. The activator retains its activity and is easy to prepare simplifying the polymerization process.

Abstract: Disclosed are unsaturated .alpha.-olefin/.alpha., .omega.-diene copolymers, and a method of preparation thereof. The copolymers are generally crystalline, free of gel and cross-links, and contain unsaturated side chains and long chain branching. The copolymers contain up to 5 mole percent diene incorporated therein, and may be prepared by copolymerization using a solid-phase, insoluble coordination catalyst, without a solvent, and below the crystalline melting point of the copolymer.

Abstract: The subject invention relates to a technique for synthesizing rubbery non-tapered, random, copolymers of 1,3-butadiene and isoprene. These rubbery copolymers exhibit an excellent combination of properties for utilization in tire sidewall rubber compounds for truck tires. By utilizing these isoprene-butadiene rubbers in tire sidewalls, tires having improved cut growth resistance can be built without sacrificing rolling resistance. Such rubbers can also be employed in tire tread compounds to improve tread wear characteristics and decrease rolling resistance without sacrificing traction characteristics.