Abstract: Catalyst compositions enabling the production of polyalkenes with improved bulk density are prepared by combining the following catalyst components in the following order of addition: first introducing an electron donor component, then adding a reaction product of a di-alkylaluminium halide and a solid component comprising a magnesium di-halide, an electron donor and a halide of tetravalent titanium and lastly adding a tri-alkylaluminium compound.

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: A hydrocarbon solvent solution of alkylaluminoxane comprises a hydrocarbon solvent having dissolved therein methylaluminoxane and an effective amount to solubilize the methylaluminoxane in the solvent of tri-n-alkylaluminum wherein the alkyl groups each contain at least two carbon atoms.

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

Abstract: Method for making crystalline polymerization catalysts is disclosed which comprises contacting the soluble complex prepared from the combination of a metal dihalide and a transition metal compound with a particulate material comprising silica to produce a solid, and then reacting the solid with an organoaluminum halide. The resulting catalyst component can be further contacted with a halide ion exchanging source selected from halides of Groups IVA and VA. Novel catalysts prepared in accordance with the invention method, polymerization processes therewith and novel polymers, having high bulk density, low levels of polymer fines, and well defined particle size and shape are also disclosed.

Abstract: A catalyst for producing styrene-based polymers having mainly syndiotactic configuration which comprises (A) a titanium compound and (B) a contact product of a methyl group-containing organoaluminum compound and water, wherein the contact product (B) has a high magnetic field component of not more than 50% in the methyl proton signal region due to an aluminum-methyl group (Al-CH.sub.3) bond as determined by the proton nuclear magnetic resonance absorption method.

Abstract: A process for preparing a catalyst for the polymerization of butadiene to obtain a polymer containing a very high content of cis isomer in which a specified neodymium carboxylate, an aluminium hydrocarbyl or aluminium hydrocarbyl hydride and a source of halogen are contacted using a particular procedure.

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 high activity alumoxane-metallocene supported catalyst for the polymerization of 1-olefins prepared by reacting undehydrated silica gel with a mixture of trimethylaluminum and triisobutylaluminum to produce a silica-alumoxane product which is then reacted with a Group IVB and/or Group VB metallocene to produce an active catalyst which may be obtained in powder form, suitable for use in gas or slurry phase reactors, by a removal of solvents and drying.

Abstract: Catalysts compositions enabling the production of polyalkenes with improved bulk density are prepared by combining the following catalyst components in the following order of addition: first introducting an electron donor component, then adding a reaction product of a di-alkylaluminium halide and a solid component comprising a magnesium di-halide, an electron donor and a halide of tetravalent titanium and lastly adding a tri-alkylaluminium compound.

Abstract: A hydrogenation catalyst prepared by combining one or more Group VIII metal compounds with one or more alkylalumoxanes and one or more alkyls or hydrides of a metal selected from the group consisting of the Group Ia, IIa, and IIa metals and a hydrogenation process wherein said catalyst is used to hydrogenate compounds containing ethylenic and/or aromatic unsaturation. Preferably, the one or more Group VIII metal compounds will be contacted sequentially with the one or more alkylalumoxanes and the one or more alkyls or hydrides, first with the one or more alkylalumoxanes and then with the one or more alkyls and/or hydrides. The one or more Group VIII metal compounds is selected from the group of compounds consisting of carboxylates, chelates, alkoxides, salts of acids containing sulfur, salts of partial esters of acids containing sulfur and salts of aliphatic and aromatic sulfonic acids. Nickel and cobalt compounds are preferred for use in the hydrogenation catalysts.

Abstract: Disclosed is a homogeneous vanadium catalyst composition prepared by the reaction of an alkylaluminum dihalide with a solid reaction product produced by reacting (A) a silicon alkoxide, (B) a hydrocarbon soluble vanadium compound, and (C) a trialkylaluminum. The solid reaction product may be produced by complexing the (A) silicon alkoxide first with either the (B) vanadium compound or the (C) trialkylaluminum. The intermediate complex (I) of such reaction is then treated with the remaining reagent (either the vanadium compound or the trialkylaluminum as the case may be) whereupon the solid reaction product (II) is formed. The solid reaction product (II) of the silicon alkoxide-vanadium compound/trialkylaluminum reaction is then reacted with (D) an alkylaluminum dihalide to produce a homogeneous hydrocarbon soluble product (III) which is highly active for catalyzing the polymerization of olefins to a polyolefin having a narrow molecular weight distribution.

Abstract: A supported alpha-olefin polymerization catalyst composition is synthesized by reacting (1) a slurry of a solid catalyst carrier in a non-polar solvent, e.g., hexane, with a dialkyl organomagnesium composition; (2) contacting the slurry of step (1) with a chlorinated alcohol; (3) contacting the slurry of step (2) with at least one transition metal compound; (4) removing the non-polar solvent to obtain a dry-flowing powder; and, (5) activating the powder with an activator. The resulting catalyst composition has high polymerization activity in the polymerization of C.sub.2 -C.sub.10 alpha-olefins and exhibits very good higher (C.sub.3 -C.sub.10) alpha-olefin incorporation properties in the copolymerization of ethylene with the higher alpha-olefins.

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: A supported alpha-olefin polymerization catalyst composition is synthesized by reacting (1) a slurry of a solid catalyst carrier in a non-polar solvent, e.g., hexane, with a dialkyl organomagnesium composition; (2) contacting the slurry of step (1) with a hydroxyl group-containing compound, e.g., an alcohol; (3) contacting the slurry of step (2) with at least one transition metal compound; (4) removing the non-polar solvent to obtain a dry-flowing powder; and, (5) activating the powder with trimethylaluminum. The resulting catalyst composition is extremely active in polymerizing C.sub.2 -C.sub.10 alpha-olefins and exhibits very good higher (C.sub.3 -C.sub.10) alpha-olefin incorporation properties.

Abstract: A supported alpha-olefin polymerization catalyst composition is synthesized by reacting (1) a slurry of a solid catalyst carrier in a non-polar solvent, e.g., hexane, with a dialkyl organomagnesium composition; (2) contacting the slurry of step (1) with a hydroxyl group-containing compound, e.g., an alcohol; (3) contacting the slurry of step (2) with at least one transition metal compound; (4) contacting the slurry of step (3) with a halogenated alkyl aluminum compound, e.g., ethyl aluminum dichloride, and, (5) activating the product of step (5) with trimethylaluminum. The resulting catalyst composition is extremely active in polymerizing C.sub.2 -C.sub.10 alpha-olefins and exhibits very good higher (C.sub.3 -C.sub.10) alpha-olefins incorporation properties.

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 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: Catalyst system, suitable for the (co)polymerization of ethylene and optionally minor amounts of 1-alkenes and/or dienes at such temperatures that the copolymer formed goes into solution, to be prepared by combining at least two components A and B, which components comprise:A. one or more magnesium compounds, one or more aluminium compounds, one or more transition metal compounds and optionally one or more halogen compounds, in such amounts that the atomic ratio of halogen to magnesium is at least 2, the atomic ratio of aluminium to transition metal is at least 3, the atomic ratio of aluminium to magnesium is at least 1, and the atomic ratio of magnesium to transition metal is at least 0.5,B. one or more organoaluminium compounds of the general formula R.sub.m.sup.1 Al X.sup.1.sub.3-m, where the symbols R.sup.1 are equal or different and represent a hydrocarbon residue with 1-20 carbon atoms and the symbols X.sup.1 are equal or different and represent a hydrogen atom, a group of the general formula --NR.sup.

Abstract: A catalyst system is disclosed as a combination of at least two components comprising: component A which is one or more titanium compounds and one or more vanadium compounds mixed with one or more organoaluminum compounds in such in amount that the atomic ratio of aluminum to the sum of titanium and vanadium is at least 3; and component B which comprises one or more organoaluminum compounds,wherein one or both of components A and B contain a chloride, and wherein during use such two components are fed, separately or in combination, directly to the reaction vessel in such an amount that the atomic ratio of the chlorine from components A and/or B to the sum of titatium and vanadium of component A is at least 6. The catalyst system is suitable for copolymerizing ethylene and optionally minor amounts of 1-alkenes and/or dienes at high polymerization temperatures.

Abstract: The homo- or copolymerization of ethylene at temperatures of 150.degree. C. to 350.degree. C. and pressures of 300 to 3500 bar is carried out in the presence of catalysts having an organometallic compound of a metal of Group III of the Periodic Table of the Elements and a titanium compound. The titanium compound is the reaction product of (a) a titanic acid ester and (b) the product of the reaction of a magnesium alcoholate and a halogen-containing aluminum alkyl compound.

Abstract: A process for producing polyethylene comprises polymerizing ethylene or copolymerizing ethylene with other .alpha.-olefin in the presence of a catalyst system obtained by bringing the following components (I) to (III) in contact with one another:(I) a reaction product (B) obtained by reacting an intermediate reaction product (A) obtained by a reaction of a hydropolysiloxane with a Grignard reagent, with at least one nucleophilic reagent selected from an aldehyde, a ketone and an alcohol,(II) a transition metal compound, and(III) at least one organic aluminum compound.

Abstract: The hydrocarbon fluid friction reducing properties of copolymers of two or more alpha-monoolefins having 2 to about 30 carbon atoms is improved by copolymerizing the monomers in the liquid state by means of a Ziegler catalyst and a two-component activator system comprised of a trialkylaluminum compound and a dialkylaluminum halide compound.

Abstract: A catalyst system for use in the polymerization of ethylene under high pressure and temperature containing an alkyl-aluminum or alkylsiloxalane activator and a compound of the formula:(TiCla) (MgCL.sub.2).sub.y (AlCl.sub.3)z (RMgCl).sub.bin whicha is from 2 to 3;y is 2 or more;z is from 0 to 1/3;b is from 0 to 1; andR is an aliphatic or aromatic hydrocarbon radical.

Abstract: A catalyst composition for polymerizing alpha-olefins is prepared by treating a carrier containing OH groups with an organomagnesium composition and contacting the thus-formed magnesium-containing carrier with a solution of a titanium (IV) alkoxide and a brominating and/or chlorinating agent. The adjustment of the molar ratio of the brominating and/or chlorinating agent to the titanium alkoxide yields catalysts which produce polymers of varying molecular weight distribution, as measured by the melt flow ratio (MFR) values. Also disclosed is a process for polymerizing alpha-olefins in the presence of the catalyst composition.

Abstract: The homo- or copolymerization of ethylene at temperatures of 150.degree. C. to 350.degree. C. and pressures of 300 to 3500 bar is carried out in the presence of catalysts having an organometallic compound of a metal of Group III of the Periodic Table of the Elements and a titanium compound. The titanium compound is the reaction product of (a) a titanic acid ester and (b) the product of the reaction of a magnesium alcoholate and a halogen-containing aluminum alkyl compound.

Abstract: A vanadium-containing catalyst component useful for the polymerization of olefins to polyolefins having a high molecular weight and a broad molecular weight distribution comprising polymerizing the polyolefins in the presence of a catalyst comprising (A) a vanadium-containing catalyst component obtained by contacting an inert support material with a dihydrocarbyl magnesium compound, optionally an oxygen-containing compound, a vanadium compound, a Group III metal halide, and (B) an aluminum alkyl cocatalyst.

Abstract: A vanadium-containing catalyst component useful for the polymerization of olefins to polyolefins having a high molecular weight and a broad molecular weight distribution comprising polymerizing the polyolefins in the presence of a catalyst comprising (A) a vanadium-containing catalyst component obtained by contacting an inert support material with a dihydrocarbyl magnesium compound, optionally an oxygen-containing compound, a vanadium compound, a Group III metal halide, and (B) an aluminum alkyl cocatalyst.

Abstract: A catalyst composition for polymerizing alpha-olefins in a gas phase continuous process is prepared by combining a catalyst precursor with a catalyst activator in such proportions that the polymer product comprises about 9.times.10.sup.-7 to about 18.times.10.sup.-7 gram-moles of the activator per gram of the polymer produced. The use of the activator in these proportions lowers the partial pressure of the monomers used in the process without sacrificing quality of the product. The catalyst precursor is prepared by reacting a carrier having OH groups with a stoichiometric excess, with respect to the OH groups, of an organomagnesium composition, and subsequently reacting the product with a transition metal compound.

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

Abstract: The invention relates to a process for preparing supported catalysts for the copolymerization of ethylene with higher alpha-olefins, characterized in that a compound of a transition metal of Groups IV, V and VI of the Periodic Table of Elements, used at its maximum valency, is precipitated on to a support of magnesium chloride and possibly aluminum chloride by a reduction reaction in two stages, employing reducing agents selected for the first stage from among alkylaluminum dihalides, and for the second stage from among organo-metallic compounds with a higher reducing power than that of the alkylaluminum dihalides.These catalysts are particularly well suited to the copolymerization in the gas phase of ethylene and higher alpha-olefins.

Abstract: A vanadium dichloride-ether complex is carried on a porous support. This complex can be produced by either forming VCl.sub.2 and thereafter complexing the material with an ether or forming an ether complex with VCl.sub.4 or VCl.sub.3 and thereafter reducing the vanadium compound to VCl.sub.2. It is also possible to carry out the complexing reaction and the reduction essentially simultaneously. The resulting catalyst in combination with a cocatalyst is capable of giving high activity in olefin polymerization and demonstrates good sensitivity to molecular weight control agents, thus allowing the production of a broad spectrum of polymers so far as molecular weight is concerned.

Abstract: A solid catalyst component for olefin polymerization comprising a hydrocarbon-insoluble product(III) obtained by reacting(A) a silicon compound selected from the group consisting of(1) silicon compounds represented by the general formula R.sup.1.sub.a R.sup.2.sub.b R.sup.3.sub.c Si, wherein R.sup.1, R.sup.2 and R.sup.3 are each an alkyl, cycloalkyl, aralkyl, aryl, alkoxy, aryloxy, or hydroxyl group or a halogen or hydrogen atom; and a, b and c are numbers defined by the formulas 0.ltoreq.a,b,c,.ltoreq.

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

Abstract: A catalyst component for polymerizing ethylene alone or with another alpha-olefin having from 3 to 18 carbon atoms at temperatures greater than about 150.degree. C. which catalyst component is the product obtained by treating at least one dehydrated particulate support material, such as silica, having an average particle size from about 0.05 to about 20 microns, preferably 1.0 to 10.0 microns, with(a) at least one dihydrocarbyl magnesium compound wherein the hydrocarbyl groups can be the same or different, such as butyl ethyl magnesium,(b) a transistion metal compound of Groups IVa, Va, or VIa of the Periodic Table, such as, for example, titanium tetrachloride, and (c) ethyl aluminum dichloride. In a preferred embodiment the particulate support material is treated with a halogenating agent prior to treatment with the transition metal compound.

Abstract: Generally, linear polyethylene containing long chain branching is obtained by polymerizing ethylene in the presence of a catalyst comprising a transition metal compound such as titanium chloride, an organoaluminum compound represented by the formula R.sub.1 R.sub.2 AlR.sub.p wherein R.sub.1 & R.sub.2 are the same or different hydrocarbyl groups having from 1 to 18 carbon atoms and R.sub.p is a polymeric hydrocarbyl group containing long chain branching and an aluminum alkyl cocatalyst.

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

Abstract: A solid catalyst component for olefin polymerization comprising a hydrocarbon-insoluble product (III) obtained by reacting(A) a silicon compound selected from the group consisting of(1) halogen-containing silicon compounds,(2) silicon compounds having a monomeric unit ##STR1## (wherein R.sup.1 and R.sup.2 may be the same or different, R.sup.1 represents an alkyl, aryl, cycloalkyl, alkoxy, or aryloxy group, or a hydrogen atom, and R.sup.2 represents an alkyl, aryl, or cycloalkyl group or a hydrogen or halogen atom) and a polymerization degree of 2 to 10,000,(3) silanols of the general formula R.sub.l.sup.3 Si(OH).sub.4-l (wherein R.sup.3 represents an alkyl, aryl, or cycloalkyl group or a hydrogen atom, and l is 1, 2 or 3) or condensation products thereof,(4) silicon compounds represented by the general formula R.sub.m.sup.4 Si(OR.sup.5).sub.4-m (wherein R.sup.4 represents n alkyl, aryl, cycloalkyl, or alkenyl group or a hydrogen atom, R.sup.

Abstract: The present invention relates to catalyst supports for the polymerization and co-polymerization of alpha-olefins, especially ethylene and propylene, consisting essentially of magnesium chloride, characterized in that these supports contain a chlorinated compound of aluminium in a quantity such that the atomic ratio of Al/Mg is comprised between 0.001 and 0.1 and that they occur in the form of spheroidal particles having a mean diameter by mass comprised between 10 and 100 microns and a narrow and controllable particle size distribution such that the ratio of the mean diameter by mass to the mean diameter by number of particles is less than or equal to 3, and also a process for the preparation of these supports.

Abstract: A method for the preparation of supported Ziegler-Natta catalysts comprising contacting a transition metal alkoxide and/or siloxide compound with a magnesium-containing reagent. The magnesium reagent is prepared in the presence of a magnesium chloride support utilizing an anhydrous and oxygen-free mixture of magnesium halide and magnesium metal, slurried in a hydrocarbon solvent. A halogenated hydrocarbon is added to produce the magnesium-containing reagent. Thereafter the transition metal alkoxide and/or siloxide compound is mixed with the slurry. An alkylating agent is added to form an active supported olefin polymerization catalyst.

Abstract: Olefins such as ethylene can be polymerized in high productivities using a catalyst system wherein one catalyst component comprises a precipitated complex of zirconium tetrahydrocarbyloxide and/or titanium tetrahydrocarbyloxide and dihydrocarbylmagnesium. The productivity of the preferred catalyst containing both zirconium and titanium has been found to be substantially higher than the productivity of those catalysts obtained from either only Zr(OR').sub.4 or only Ti(OR").sub.4 and second catalyst component comprises at least one organometallic compound of a metal selected from the Groups I-III of the Mendeleev Periodic Table.

Abstract: Catalysts for the polymerization of ethylene or its copolymerization with C.sub.3 -C.sub.2 alpha-monoolefins are often pre-activated by polymerizing a small amount of C.sub.4 -C.sub.12 alpha-monoolefin onto the catalyst in the presence of an alkyl aluminum compound. The resultant pre-activated catalyst component is used in the form of a dispersion in an inert solvent. The dispersions have a tendency to separate into two phases rapidly and are thus difficult to add uniformly to a polymerization reaction. When the alkyl aluminum compound is replaced by a synergistic mixture of an alkyl aluminum choride and an oxygen-containing aluminum compound having oxygen attached to at least one aluminum valence, a stable dispersion is formed which will not separate into two phases for long periods of time.

Abstract: A high surface area catalyst component or support is produced by swelling a magnesium halide, e.g., MgCl.sub.2, with a secondary or tertiary alcohol, adding a hydrocarbon diluent, and removing some or substantially all of the free or unreacted alcohol. In one preferred embodiment, the alcoholate product is contacted with a halogenated tetravalent titanium compound, e.g., TiCl.sub.4, to form a first catalyst component (A) which can be combined with a cocatalyst component (B) comprising a metallic hydride or an organometallic compound, e.g., an organoaluminum compound to form a catalyst system active for olefin polymerization.