Abstract: An olefin polymerization catalyst comprising: (A) a solid catalyst component prepared by contacting (a) a dialkoxyl magnesium, (b) a tetra-valent titanium halide, and (c) a phthalic acid diester in (d) an aromatic hydrocarbon having a boiling point in the range of 50 to 150° C., (B) an organoaluminum compound of the formula R1pAlQ3?p, one or more compounds selected from the group consisting of (C) one or more halogen-containing organosilicon compounds selected from (C1) a halogen-containing organosilicon compound of the formula R21Si(OR3)4?l?mXm and (C2) a halogen-containing organosilicon compound of the formula R4qSi(OR5)4?q, and (D) an organosilicon compound of the formula R6sSi(OR7)4?s. The catalyst exhibits excellent activity to hydrogen and the same catalytic activity and yield performance as conventional catalysts, and possesses the capability of producing polymers with stereoregularity equivalent to conventional catalysts.

Abstract: A solid titanium complex catalyst for polymerization and copolymerization of ethylene is prepared by the process comprising: (1) preparing a magnesium solution by reacting a halogenated magnesium compound with an alcohol; (2) reacting the magnesium solution with a phosphorus compound and a silicon compound having at least one alkoxy group to produce a magnesium composition; and (3) producing a solid titanium catalyst through recrystallization by reacting the magnesium composition solution with a mixture of a titanium compound and a haloalkane compound; and optionally reacting the solid titanium catalyst with an additional titanium compound. The solid titanium complex catalyst for polymerization and copolymerization of ethylene according to present invention exhibits high polymerization activity, and may be advantageously used in the polymerization and copolymerization of ethylene to produce polymers of high bulk density and narrow molecular weight distribution.

Abstract: The present invention relates to the use of at least one acid and at least one base and/or at least one reductant and at least one oxidant that when used with a polymerization catalyst in a polymerization process results in the controllable generation of a catalyst inhibitor that renders the polymerization catalyst substantially or completely inactive.

Abstract: The present invention relates to the use of at least one acid and at least one base and/or at least one reductant and at least one oxidant that when used with a polymerization catalyst in a polymerization process results in the controllable generation of a catalyst inhibitor that renders the polymerization catalyst substantially or completely inactive.

Abstract: The present invention is directed to a novel one-step method for forming a supported catalyst complex of high activity by substantially simultaneously contacting a bidentate or tridentate ligand forming compound, a transition metal compound and a Lewis acid support-activator agglomerate. The catalyst can be formed prior to polymerization of olefins or within the polymerization reaction zone.

Abstract: Catalyst system for olefin polymerization comprising A) at least one calcined hydrotalcite, B) at least one organic transition metal compound, C) optionally one or more cation-forming compounds and D) at least one organic magnesium compound.

Abstract: There are provided; (i) a solid catalyst component obtained by contacting a trivalent titanium atom-containing solid catalyst component precursor (C) with a halogeno compound (A) of the 13 or 14 group of elements in the periodic table of the elements and an electron donor (B), or a solid catalyst component obtained by contacting an intermediate product with a titanium-halogen bond-carrying compound (D), the intermediate product being obtained by contacting the solid catalyst component precursor (C) with a halogeno compound (A?) of the 14 group of elements in the periodic table of the elements and the electron donor (B), or a solid catalyst component comprising a magnesium atom, a titanium atom, a halogen atom and an electron donor and having a relative surface area of not more than 30 m2/g, the catalyst component being superior in a particle form, and (ii) a catalyst comprising the solid catalyst component and an organoaluminum compound, the catalyst being high in polymerization activity.

Abstract: A catalyst used for trimerization of ethylene into 1-hexene is descrobed, which comprises (i) a specific organometallic complex having a neutral multidentate ligand having a tripod structure, (ii) an alkylaluminoxane, and an optional ingredient selected from: (iii) a halogenated inorganic compound, (iv) a specific alkyl group-containing compound, (v) a combination of a halogenated inorganic compound with a specific alkyl group-containing compound, (vi) an amine compound and/or an amide compound, and (vii) a combination of an amine compound and/or an amide compound with a specific alkyl group-containing compound.

Abstract: A process for making a polyolefin catalyst component, catalyst and polymer resin is disclosed. Controlling the viscosity of a catalyst synthesis solution with the addition of aluminum alkyl alters the precipitation of the catalyst component from a catalyst synthesis solution. The average particle size of the catalyst component increases with an increased concentration of aluminum alkyl in the synthesis solution. The catalyst component can be produced by a process comprising contacting a magnesium alkyl compound with an alcohol and an aluminum alkyl to form a magnesium dialkoxide. Catalyst components, catalysts, catalyst systems, polyolefin, products made therewith, and methods of forming each are disclosed. The reaction products can be washed with a hydrocarbon solvent to reduce titanium species [Ti] content to less than about 100 mmol/L.

Abstract: A propylene block copolymer with a high proportion of ethylene-propylene copolymer particles (rubber component) well dispersed in a propylene polymer exhibiting well-balanced rigidity and impact resistance can be obtained by using a solid catalyst for polymerization of olefins comprising (a) a solid catalyst component with controlled morphology, comprising magnesium, titanium, and a halogen atom, having an average particle diameter, specific surface area, and pore volume in a specific range, and having a pore size distribution in which an cumulative pore volume with a pore size of 100 ? or less is more than 50%, (b) an organoaluminum compound, and (c) an organosilicon compound. The block copolymer is very useful particularly for the application of vehicle parts such as a bumper and parts for household electric appliances.

Abstract: A solid titanium complex catalyst for polymerization and copolymerization of ethylene is prepared by the process that includes: (1) preparing a magnesium solution by reacting a halogenated magnesium compound with an alcohol; (2) reacting the magnesium solution with an ester compound having at least one hydroxyl group and a silicon compound having an alkoxy group to produce a magnesium composition; and (3) producing a solid titanium catalyst by reacting the magnesium composition solution with a mixture of a titanium compound and a haloalkane compound; and optionally reacting the solid titanium catalyst with an additional titanium compound.

Abstract: The present invention relates to a solid complex titanium catalyst for homo-polymerization and co-polymerization of &agr;-olefin, obtained by (i) producing a solution of a magnesium compound by dissolving a magnesium compound and a compound of IIIA Group of the Periodic Table in a solvent mixed with cyclic ether, one or more types of alcohol, a phosphorous compound, and an organosilane, (ii) precipitating the solid particles by reacting said magnesium solution with a compound of a transition metal, a silicon compound, or the mixture thereof, and (iii) reacting said precipitated solid particles with a titanium compound and an electron donor. The catalyst of the present invention is of large particle size, narrow particle distribution, and high catalytic activity, while the polymers obtained with the use of this catalyst are of excellent stereoregularity.

Abstract: The invention is directed to a process for the preparation of a catalyst component for the polymerization of an olefin by: a) contacting metallic magnesium with an organic halide RX, where R is an organic group containing up to 20 carbon atoms and X is a halide, whereupon the dissolved reaction product I is separated from the solid residual products and whereafter, b) an alkoxy group or aryloxy group containing silane compound is added to the obtained reaction product I, whereupon the precipitate formed is purified to obtain reaction product II, c) which reaction product II is subsequently contacted with TiCl4 and the resulting product is purified to obtain the catalyst component. The invention is characterized in that in step b) the silane compound and reaction product I are introduced simultaneously to a mixing device.

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 pre-catalyst is formed by reacting butylethylmagnesium with an alcohol to form a magnesium alkoxide compound, followed by contacting the magnesium alkoxide compound with a phosporous compound to form a magnesium alkoxide phosphorous compound mixture. The magnesium alkoxide phosphorous compound mixture is subsequently reacted with TiCl4 to form a MgCl2 support. The MgCl2 support is then contacted with an internal donor while being heated to form a first catalyst slurry, which is then contacted with TiCl4 while being heated to form a second catalyst slurry. The second catalyst slurry is next contacted with TiCl4 while being heated to form a third catalyst slurry, which is washed and dried, resulting in a highly active pre-catalyst with controlled morphology. The pre-catalyst may be combined with one or more co-catalysts and optionally one or more external electron donors to form an active catalyst system, which may be used for polymerization of olefins.

Abstract: A new synthesis of a Ziegler-Natta catalyst uses a multi-step preparation that includes treating a magnesium dialkoxide compound with two halogenating/titanating agents, the second stronger than the first, an organoaluminum preactivating agent, and a heat treatment. The catalyst may be used in the polymerization of olefins, particularly ethylene, to control the molecular weight distribution of the resulting polyolefins.

Abstract: A solid component of catalyst for the (co)polymerization of ethylene and &agr;-olefins contains magnesium-carboxylate bonds and transition metal-carboxylate and can be represented by the formula: M1Mg(0.3-20)X(2-60)Al(0-6)(R—COO)(0.1-3)  (I) wherein: M is at least one metal selected from titanium, vanadium, zirconium and hafnium, X is a halogen excluding iodine, and R is an aliphatic, cycloaliphatic or aromatic hydrocarbon radical, containing at least 4 carbon atoms. A description follows of the preparation of a solid component of catalyst (I) and its use in procedures for the (co)polymerization of ethylene and &agr;-olefins.

Abstract: Catalyst systems of the Ziegler-Natta type, which are suitable for the polymerization of olefins are prepared by: A) bringing an inorganic metal oxide on which a magnesium compound has been deposited into contact with a tetravalent titanium compound, B) if desired, bringing the intermediate obtained in this way into contact with an electron donor compound and C) bringing the intermediate obtained in step A) or B) into contact with a polysiloxane.

Abstract: A catalyst composition that is the combination of or the reaction product of ingredients comprising (a) an lanthanide compound, (b) an alkylating agent, (c) a nickel-containing compound, and optionally (d) a halogen-containing compound, with the proviso that the halogen-containing compound must be present where none of the lanthanide compound, the alkylating agent, and the nickel-containing compound contain a labile halogen atom.

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: It has been discovered that using n-butylmethyldimethoxysilane (BMDS) as an external electron donor for Ziegler-Natta catalysts can provide a catalyst system that may prepare polypropylene films with improved properties. The catalyst systems of the invention provide for controlled chain defects/defect distribution and thus a regulated microtacticity. Consequently, the curve of storage modulus (G′) v. temperature is shifted such that the film achieves the same storage modulus at a lower temperature enabling faster throughput of polypropylene film through a high-speed tenter.

Abstract: Provided is a catalyst system for polymerization of monomers having at least one Ziegler-Natta polymerizable bond, comprising: a) a supported Ziegler-Natta transition metal catalyst having a magnesium component modified with a metallocene catalyst component, such that the ratio of magnesium component to metallocene component is within the range of about 1:1 to about 4:1, during its synthesis or production; and b) an effective co-catalyst.

Abstract: A catalyst having high activity independent of the hydrogen concentration and low gel productivity in the polymerization of ethylene has been prepared.

Abstract: A catalyst composition has a catalyst component which includes a metallocene transition metal compound, a magnesium compound, a hydroxyl containing compound, and a polymeric material. The catalyst component may also include asilicon compound and an aluminum compound. The catalyst component is combined with a cocatalyst and used in olefin polymerization.

Abstract: The group IIa metal containing catalyst system of this invention can be utilized to synthesize rubbery polymers having a high trans microstructure by solution polymerization. Such rubbery polymers having a high trans microstructure content, such as polybutadiene rubber, styrene-isoprene-butadiene rubber, styrene-butadiene rubber, can be utilized in tire tread rubbers that exhibit improved wear and tear characteristics. This invention more specifically reveals a catalyst system which is comprised of (a) an organolithium compound, including organolithium functionalized compounds, (b) a group IIa metal salt selected from the group consisting of group IIa metal salts of di(alkylene glycol)alkylethers and group IIa metal salts of tri(alkylene glycol) alkylethers, and (c) an organoaluminum compound, and optionally an organomagnesium compound.

Abstract: The present invention provides a catalyst system and methods for polymerizing homopolymers or copolymers of olefins, preferably polypropylene and copolymers of polypropylene. The catalyst system includes a Ziegler-Natta or Ziegler-Natta-type catalysts in combination with a mixture of silane electron donors, preferably at least two electron donors, even more preferably three electron donors, selected from tetraethoxysilane, methylcyclohexyldimethoxysilane, propyltrimethoxysilane, propyltriethoxysilane, dimethyldimethoxysilane, methyltrimethoxysilane, dicyclopentyldimethoxysilane and mixtures thereof. The preferred silane electron donor is methylcyclohexyldimethoxysilane.

Abstract: The present invention provides a catalyst for producing an ultra high molecular weight polyethylene and also a method for preparation of an ultra high molecular weight polyethylene with the use of said catalyst. The catalyst of the present invention is prepared by a process comprising: (i) producing a magnesium compound solution by contact-reacting a magnesium compound and an aluminum or boron compound with alcohol; (ii) contact-reacting the said solution with an ester compound containing at least one hydroxy group and a silicon compound containing an alkoxy group; and (iii) producing of a solid titanium catalyst by adding a mixture of a titanium compound and a silicon compound thereto. The catalyst prepared by the present invention has excellent catalytic activity, and it helps to produce an ultra-high molecular weight polyethylene with large bulk density and narrow particle distribution without too large and minute particles.

Abstract: The present invention is directed to a coordinating catalyst system comprising at least one metallocene or constrained geometry pre-catalyst transition metal compound, (e.g., di-(n-butylcyclopentadienyl)zirconium dichloride), at least one support-activator (e.g., spray dried silica/clay agglomerate), and optionally at least one organometallic compound (e.g., triisobutyl aluminum), in controlled amounts, and methods for preparing the same. The resulting catalyst system exhibits enhanced activity for polymerizing olefins and yields polymer having very good morphology. The support-activator is a layered material having a negative charge on its interlaminar surfaces and is sufficiently Lewis acidic to activate the transition metal compound for olefin polymerization.

Abstract: A solid catalyst component for the polymerization of olefins CH2═CHR, in which R is hydrogen or a hydrocarbon radical having 1-12 carbon atoms, the solid catalyst component including Mg, Ti, halogen and an electron donor selected from &bgr;-substituted glutarates other than diisopropyl &bgr;-methyl glutarate and which are not alpha-substituted. The catalyst component, when used in the polymerization of olefins, and in particular polypropylene, is capable of providing polymers in high yield and with a high isotactic index expressed in terms of high xylene insolubility.

Abstract: Catalyst support containing an &agr;-olefin polymer which is in the form of particles of mean size from 5 to 350 &mgr;m in which the pore volume generated by the pores of radius from 1,000 to 75,000 Å is at least 0.2 cm3/g. Catalyst usable for the polymerization of &agr;-olefins, including a compound containing at least one transition metal belonging to groups IIIb, IVb, IVb and VIb of the Periodic Table, bound in or on this support.

Abstract: A Ziegler-Natta type catalyst having an improved hydrogen response provides for narrowing of the MWD of resulting polyolefins polymerized using such catalyst, with such catalyst generally made by a) contacting a soluble magnesium dialkoxide compound of the general formula Mg(OR″)2 with a halogenating agent capable of exchanging one halogen for one alkoxide to form a reaction product A, where R″ is a hydrocarbyl or substituted hydrocarbyl having from 1 to 20 carbon atoms; b) contacting reaction product A with a first halogenating/titanating agent to form reaction product B; and c) contacting reaction product B with a second halogenating/titanating agent to form a catalyst component; wherein in at least one of steps b) and c), the halogenating/titanating agent is a blend of Ti(OPr)4 and TiCl4. Catalyst components, catalysts, catalyst systems, polyolefin polymers, and methods of forming each are disclosed.

Abstract: A solid self-supported cycloalkadienyl catalyst component is disclosed that includes: (i) a mixed metal alkoxide complex which is the reaction product of a magnesium alkoxide or aryloxide and at least one group IVB metal-containing alkoxide or aryloxide; and (ii) Cp, where Cp is a cyclic or polycyclic hydrocarbon having from 3-30 carbon atoms. A self-supported hybrid catalyst also is disclosed which contains the above components (i) and (ii), as well as (iii) a Ziegler-Natta catalyst species. A method of making the self-supported cycloalkadienyl catalyst and the self-supported hybrid catalyst and a method of polymerizing olefins using the catalysts also are disclosed. The catalysts are capable of producing polyolefins in high yield having a broad molecular weight distribution, or a bimodal distribution.

Abstract: The invention relates to a process for the manufacture of a solid catalytic component for the polymerization or copolymerization of olefins, resulting in a polymer or copolymer with broadened molecular mass distribution. The process includes a first stage including bringing into contact a) a solid support including at its surface at least 5 hydroxyl groups per square nanometre (OH/nm2) and b) an organic magnesium derivative, and optionally, preferably, c) an aluminoxane, to obtain a first solid, and then a second stage including bringing the first solid and a chlorinating agent into contact to obtain a second solid and then, in a later stage, impregnation of the second solid with a transition metal derivative.

Abstract: A catalyst composition has a catalyst component which includes a metallocene transition metal compound, a magnesium compound, a hydroxyl containing compound, and a polymeric material. The catalyst component may also include asilicon compound and an aluminum compound. The catalyst component is combined with a cocatalyst and used in olefin polymerization.

Abstract: A catalyst composition for alpha olefin polymerization is provided. The catalyst composition is prepared by a process including treating PVC containing particles with an organomagnesium compound in an inert solvent, contacting the treated PVC containing particles with a transition metal compound from the group TiCl4, VCl4 or ZrCl4, in the absence of an electron donor, and activating the product particles with a cocatalyst. An organoaluminum compound can also be mixed with the organomagnesium compound prior to treating the PVC containing particles.

Abstract: The present invention provides a catalyst system that exhibits unexpected control of desired properties in copolymer product. The catalyst system includes a conventional supported Ziegler-Natta catalyst in combination with an electron donor described by the formula: wherein R1 is a linear alkyl group attached to the silicon atom; R2 and R3 are alkyl or aryl groups and R4 is a linear alkyl attached to the silicon atom, R1 and R4 are the same or different. R1 and R4 are preferably linear carbon groups of 4-13 carbon atoms, more preferably 4-7 carbon atoms; most preferably R1 and R4 are the same and are n-butyl groups. The system exhibits good control over the melt flow index of the copolymer products.

Abstract: A solid self-supported hybrid catalyst is disclosed which contains (i) a Ziegler-Natta catalyst component including at least one group IVB metal-containing alkoxide or aryloxide; and (ii) Cp, where Cp is a cycloalkadienyl hydrocarbon having from 3-30 carbon atoms. A method of making the self-supported hybrid catalyst and a method of polymerizing olefins using the catalysts also are disclosed. The catalysts are capable of producing polyolefins in high yield having a broad molecular weight distribution, or a bimodal molecular weight distribution.

Abstract: The present invention is directed to a coordinating catalyst system comprising at least one bidentate or tridentate ligand containing pre-catalyst transition metal compound, (e.g., 2,6-bis (2,4,6-trimethylarylamino)pyridyl iron dichloride), at least one support-activator (e.g., spray dried silica/clay agglomerate), and optionally at least one organometallic compound (e.g., triisobutyl aluminum), in controlled amounts, and methods for preparing the same. The resulting catalyst system exhibits enhanced activity for polymerizing olefins and yields polymer having very good morphology.

Abstract: A catalyst component formed by the steps of contacting a transition metal-containing metallocene of a transition metal of Group 4, 5 or 6 of the Periodic Table of the Elements with silica or an organic support. This product is contacted with an organomagnesium compound or complex followed by contact with an alcohol and a silane. Finally, the so-contacted product is contacted with a Group 4, 5 or. 6 transition metal-containing non-metallocene compound. The component is preferably combined with an aluminum-containing cocatalyst to form a catalyst system.

Abstract: A solid self-supported cycloalkadienyl catalyst component is disclosed that includes: (i) a mixed metal alkoxide complex which is the reaction product of a magnesium alkoxide or aryloxide and at least one group IVB metal-containing alkoxide or aryloxide; and (ii) Cp, where Cp is a cyclic or polycyclic hydrocarbon having from 3-30 carbon atoms. A self-supported hybrid catalyst also is disclosed which contains the above components (i) and (ii), as well as (iii) a Ziegler-Natta catalyst species. A method of making the self-supported cycloalkadienyl catalyst and the self-supported hybrid catalyst and a method of polymerizing olefins using the catalysts also are disclosed. The catalysts are capable of producing polyolefins in high yield having a broad molecular weight distribution, or a bimodal distribution.

Abstract: The present invention provides a compound catalyst system useful for synthesizing polyethylenes or copolymers of ethylene having bimodal or broad molecular weight distributions, prepared by incorporating an organic alcohol as an electron-donor compound and an aluminoxane compound into the prior art compound catalyst systems, thereby promoting the activities of the two active centers, which leads to not only a large improvement in the activity of the catalyst system, but also the formation of polyethylenes and copolymers of ethylene having bimodal or broad molecular weight distributions, which in turn gives polymers having excellent processability and mechanical properties. A process for preparing the solid catalyst component used in the compound catalyst system according to the present invention and use of the compound catalyst system are also disclosed.

Abstract: A method for preparing an &agr;-olefin polymer comprising the step of polymerizing or copolymerizing an &agr;-olefin in the presence of a catalyst containing a solid catalyst constituent (A) which contains magnesium, titanium, a halogen element and an electron donor, an organoaluminum compound constituent (B), an organosilicon compound constituent (C) represented by the following general formula (1); and an organosilicon compound constituent (D) represented by the following general formulas (2) or (3) to prepare an &agr;-olefin polymer RnSi(OR)4−n  (1) wherein R is a hydrocarbon group having 1 to 8 carbon atoms, n is integer of 1 or 2; wherein R1 is a hydrocarbon group having 1 to 8 carbon atoms, R2 is a hydrocarbon group having 1 to 8 carbon atoms, a hydrocarbylamino group having 2 to 24 carbon atoms, or a hydrocarbylalkoxy group having 1 to 24 carbon atoms, R3N is a polycyclic amino group having 7 to 40 carbon atoms, wherein the carbon atoms and the nitrogen atom form a c

Abstract: The invention relates to a complex product containing magnesium, halogen and alkoxy, which has the following composition: MgpXq(OR)2p-q wherein X is a halogen, R is an alkyl group having from 1 to 20 carbon atoms, p is from 2 to 20 and q is from 1 to (2p−1). More specifically the complex product is a complex of the formula MgCl2.[Mg(OR)2]2 wherein R is an alkyl having from 4 to 10 carbon atoms. The complex is soluble in non-polar solvents and can be used in the preparation of transition metal components of Ziegler-Natta catalyst systems.

Abstract: A self-supported hybrid olefin polymerization catalyst comprising a Ziegler-Natta component and a metallocene component whereby the metallocene component is affixed to the Ziegler-Natta component is disclosed. In the hybrid catalyst, the Ziegler-Natta component includes a solid complex of magnesium, transition metal, and alkoxide moieties where the transition metal is selected from one or more metals having an oxidation state of +3, +4, +5, and mixtures thereof. A method of making the hybrid catalyst and a method of polymerizing olefins using the hybrid catalyst also are disclosed. The hybrid catalyst is capable of producing polyolefins having a broad molecular weight, or bimodal distribution in high yield.

Abstract: There are provided (i) a catalyst component (C), (ii) an olefin polymerization catalyst, and (iii) a process for producing an olefin polymer. The catalyst being obtained by contacting a solid catalyst component (A), an organoaluminum compound (B) and the catalyst component (C) of an organosilicon compound represented by the following formula (1), wherein n is 1 or 2, R1 to and R6 are independently of one another a hydrogen or halogen atom or a hydrocarbon group, or may be bonded with one another to form a ring, R7 is a hydrocarbon group, and when n is 2, two R1s, R2s, R3s, R4s, R5s and R6s may be the same or different.

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: The present invention provides a Ziegler-Natta catalyst 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 5.5:1 and molar ratio of magnesium to transition metal from 4.0:1 to 5.5:1.

Abstract: A catalyst for &agr;-olefin polymerization obtained by contacting (A) a solid catalyst component containing a titanium compound which is obtained by treating a solid product obtained by contacting an organosilicon compound having an Si—O bond, an ester compound and an organomagnesium compound, with an ether compound, titanium tetrachloride and an acyl halide, and successively treating said treated solid with an mixture of an ether compound and titanium tetrachloride, or a mixture of an ether compound, titanium tetrachloride and an ester compound, (B) an organoaluminum compound and (C) an electron-donative compound, and a process for producing an &agr;-olefin polymer with the catalyst.

Abstract: Solid catalyst components for the polymerization of olefins, comprising titanium, magnesium and a compound of general formula (I), wherein R1 and R2 may be the same or different and each represents a linear or branched hydrocarbon group having 1 to 20 carbon atoms, and n is an integer of 1 to 10, as an electron donor, which are combined with organoaluminum compounds to form polymerization catalysts for the production of olefin polymers. This electron donor has no problems of safety and hygiene, and is inexpensive and easily synthesized. This compound can provide highly active and highly stereoregular solid catalyst components for the polymerization of olefins, catalysts for the polymerization of olefins, and processes for producing olefin polymers.

Abstract: One aspect of the present invention relates to a catalyst system for use in olefinic polymerization, containing a solid titanium catalyst component prepared by contacting a titanium compound and a magnesium compound; an organoaluminum compound having at least one aluminum-carbon bond; and an organosilicon compound comprising at least one of cyclobutyl group. Another aspect of the present invention relates to a method of making a catalyst for use in olefinic polymerization, involving the steps of reacting a Grignard reagent having a cyclobutyl group with an orthosilicate to provide an organosilicon compound having a cyclobutyl moiety; and combining the organosilicon compound with an organoaluminum compound having at least one aluminum-carbon bond and a solid titanium catalyst component prepared by contacting a titanium compound and a magnesium compound.