Abstract: The present invention provides a composition and a process wherein a metallocene catalyst is dissolved in an alumoxane which has been dissolved in a solvent to form a concentrated stock solution of metallocene-alumoxane which can be stored for at least 14 days. The metallocene-alumoxane solution is stored under an oxygen- and water-free environment and more preferably under argon at temperatures that can range from about 25 degrees Fahrenheit (-4 degrees C.) to about 85 degrees Fahrenheit (29 degrees C.). Before or at the time that the metallocene-alumoxane solution is injected into the reactor, it is diluted with a second solution comprised of either an alumoxane, an aluminum alkyl or mixtures thereof dissolved in an oleaginous solvent. The addition of the aluminum based co-catalyst serves a two fold purpose.

Abstract: Polyolefins having a high molecular weight, an appropriate molecular weight distribution and a relatively narrow composition distribution are prepared in high activity.The polymerization of an olefin or olefins is performed in the presence of a catalyst comprising a catalyst component and a modified organoaluminum compound, the catalyst component being prepared by mutually contacting (1) a compound of the general formula Me.sup.1 R.sup.1.sub.n X.sup.1.sub.4-n and (2) an alkali metal salt of cyclopentadiene or indene and optionally (3) a compound of the general formula Me.sup.2 R.sup.2.sub.m X.sup.2.sub.3-m, and the modified organoaluminum compound and water and containing Al--O--Al bond(s).

Abstract: A catalyst for .alpha.-olefin polymerization which comprises the following components (A) and (B):component (A), which is a transition metal compound represented by the formulaQ(C.sub.5 H.sub.4-m R.sup.1.sub.m)(C.sub.5 H.sub.4-n R.sup.2.sub.n)MeXYwherein (C.sub.5 H.sub.4-m R.sup.1.sub.m) and (C.sub.5 H.sub.4-n R.sup.2.sub.n) respectively represent a conjugated five-membered ring ligand coordinating to a metal Me; R.sup.1 and R.sup.

Abstract: A process for the production of EPM or EPDM comprising contacting ethylene, propylene, and, optionally, one or more dienes, in a fluidized bed, at a temperature at or above the sticking temperature of the product resin, under polymerization conditions, with(i) a prepolymer containing a transition metal catalyst precursor with the proviso that the prepolymer is not sticky at the process temperature;(ii) a hydrocarbyl aluminum and/or a hydrocarbyl aluminum halide cocatalyst,; and, optionally,(iii) a halocarbon promoter; and, optionally,(iv) an inert particulate material having a mean particle size in the range of about 0.01 to about 150 microns wherein the particulate material is either contained in the prepolymer or is independent of the prepolymer,wherein the amount of prepolymer or the combined amount of prepolymer and inert particulate material is sufficient to essentially prevent agglomeration of the fluidized bed and the product resin.

Abstract: A multiple site solid catalyst component capable of producing polyolefins having a broad or multimodal molecular weight distribution, such as a bimodal molecular weight distribution, is prepared by contacting a particulate solid support with a zirconium compound or complex to bind the zirconium compound or complex to the support, optionally followed by contacting the supported zirconium compound or complex with a Lewis acid to produce an intermediate product, optionally isolating and washing the supported zirconium compound or complex or resulting intermediate product to remove soluble by-products therefrom, and reacting the washed or unwashed supported zirconium compound or complex or intermediate product with a titanium or vanadium compound to produce a solid catalyst component.

Abstract: A process for the production of EPDM comprising reacting ethylene, propylene, ethylidene norbornene, and hydrogen, in the gas phase, in a fluidized bed, under polymerization conditions, in the presence of a catalyst system comprising:(a) the reaction product of a vanadium compound and a electron donor;(b) at least one modifier having the formula BX.sub.3 or AlR.sub.(3-a) X.sub.a wherein each R is alkyl or aryl and is alike or different; each X is independently chlorine, bromine, or iodine; and a is 0, 1, or 2,wherein components (a) and (b) are impregnated into an inorganic support;(c) a halocarbon promoter; and(d) a hydrocarbyl aluminum cocatalyst with the following proviso:(i) the partial pressure of ethylene is in the range of about 25 to about 200 psi;(ii) the molar ratio of propylene to ethylene is in the range of about 0.2:1 to about 2:1;(iii) the molar ratio of hydrogen to ethylene is in the range of about 0.0001:1 to about 0.01:1; and(iv) the amount of ethylidene norbornene is about 1.

Abstract: An improved catalyst for the polymerization of olefins comprising at least one metallocene and at least one aluminoxane co-catalyst supported on a substrate comprising a cross-linked polymeric, porous, resin wherein at least one of the monomers in the resin has at least one pendant functional group which is not reactive under the conditions of the formation of the substrate, and therefore survives the copolymerization which forms the substrate. One specific cross-linked resin is a copolymer of styrene, divinyl benzene and acetoxy styrene.

Abstract: Polyolefins having a molecular weight distribution M.sub.w /M.sub.n of .gtoreq.3 and which may be monomodal, bimodal or multimodal are obtained by polymerization or copolymerization of olefins of the formula RCH.dbd.CHR, in which a catalyst system comprising an aluminoxane and a transition-metal component (metallocene) is used, the transition-metal component comprising at least one zirconocene of the formula I ##STR1## and at least one zirconocene of the formula Ia or alternatively at least 2 zirconocenes of the formula I.

Abstract: A catalyst for polymerizing an aromatic vinyl compound is provided which is composed of a catalyst component (A) and a catalyst component (B); the catalyst component (A) being a reaction product derived by reacting an organic transition metal compound having a substituted or unsubstituted cyclopentadienyl group, with an alkylaluminum compound, and represented by the general formula (I): ##STR1## where C.sub.5 R.sup.1.sub.m is a substituted or unsubstituted cyclopentadienyl group: R is hydrogen or a hydrocarbon group having 1 to 20 carbons, each R.sub.1 being independent; R.sup.2 is an alkylene group having 1 to 4 carbons, a dialkylsilicon group, a dialkylgermanium group, an alkylphoshine group, or an alkylamine group, the alkylene or alkyl group, and R.sup.2 crosslinks the two (C.sub.5 R.sup.1.sub.m) rings; m is an integer of 0 to 5; n is 0 or 1; when n=0, m=5, Q is an alkyl group or a halogen atom; R.sup.

Abstract: A process comprising contacting a mixture comprising ethylene, propylene, and, optionally, a diene, in the gas phase, under polymerization conditions, with a catalyst system comprising:(a) a catalyst precursor, in independent or prepolymer form, consisting of vanadium (acetylacetonate).sub.3 ;(b) optionally, a support for said precursor;(c) a cocatalyst consisting essentially of (i) an alkylaluminum halide having the formula AlR.sub.(3-a) X.sub.a wherein each R is independently alkyl having 1 to 14 carbon atoms; each X is independently chlorine, bromine, or iodine; and a is 1 or 2, and (ii) optionally, a trialkylaluminum provided that the molar ratio of alkylaluminum halide to trialkylaluminum is at least about 1.

Abstract: A process for the production of EPRs comprising contacting ethylene, propylene, and optionally, a diene, under polymerization conditions, with a catalyst system comprising:(A) a catalyst precursor comprising:(i) a vanadium compound, which is the reaction product of(a) VX.sub.3 wherein each X is independently chlorine, bromine, or iodine; and(b) an electron donor, which is a liquid, organic Lewis base in which VX.sub.3 is soluble;(ii) a modifier having the formula BX.sub.3 or AlR.sub.(3-a) X.sub.

Abstract: In accordance with the present invention, there are provided an olefin polymerization catalyst formed from:[A] a compound of a transition metal belonging to Group IV B of the periodic table,[B] an aluminoxane, and[C] water,an olefin polymerization catalyst formed from [D] an organoaluminum compound in addition to the above-mentioned [A], [B] and [D] components, and processes for the polymerization of olefins using the above-mentioned olefin polymerization catalysts, respectively.

Abstract: This invention relates to a catalyst system using a diethylaluminum alkoxide-aluminum alkyl cocatalyst and to a process for polymerization of olefins using the catalyst system. Use of this catalyst system increases polymerization yield. The diethylaluminum alkoxide is preferably diethylaluminum ethoxide and the aluminum alkyl is preferably triethyl aluminum. The mole-to-mole ratio of diethylaluminum alkoxide to aluminum alkyl ranges from 0.05 to 0.2. This invention is effective for the aluminum/transition metal ratio for the polymerization of olefins ranges from about 100 to about 500. Polymerization yield increases of greater than 10% are realized.

Abstract: The present invention relates to a process for polymerizing olefins.In the process of the present invention, olefins are polymerized using a catalyst composed of a compound of a transition metal (e.g. zirconium) of Group IVB of the periodic table, an aluminoxane produced from trimethylaluminum, and an aluminoxane wherein at least one hydrocarbon group other than n-alkyl groups is bonded to an aluminum atom. The present process can polymerize olefins with excellent polymerization activity and can produce an olefin polymer having a relatively large molecular weight even when the use amount of the aluminoxane produced from trimethylaluminum (which is expensive) is small.

Abstract: An improved polymerization process for making essentially nonagglomerated ethylene polymers, especially EPR polymers, based on the use of a stage-modified high activity vanadium catalyst, under polymerization conditions that normally would yield an undesirable amount of agglomerated polymer.

Abstract: In accordance with the present invention, there are provided olefin polymerization catalyst components comprising an organoaluminum oxy-compound having less than 10% in terms of Al atom of Al component dissolving in benzene kept at 60.degree. C., and olefin polymerization catalyst containing said olefin polymerization catalyst components. The olefin polymerization catalysts have excellent polymerization activities, and are capable of giving olefin (co)polymers having a narrow molecular weight distribution and a narrow composition distribution.

Abstract: A process for the production of primarily syndiotactic vinyl aromatic polymers by polymerizing or copolymerizing vinyl aromatic monomers such as styrene or styrene derivatives in the presence of a catalyst system comprising the product of the reaction between:a) a compound of a transition metal (M) different from titanium and containing at least a bond M-O, M-C, M-N, M-P, M-S or M-halogen, andb) an organoaluminum compound containing at least an oxygen atom bound to the aluminum atom or bound between two aluminum atoms.Compound a) can be used as such or may be supported on a suitable carrier.

Abstract: An olefin is polymerized or copolymerized under the presence of an olefin-polymerizing catalyst prepared from (A) a transition-metal compound or (A') a transition-metal compound loaded on a fine-particle carrier, said transition metal being selected from group IVB in the periodic table; (B) an aluminoxane; and (C) an organoaluminum compound represented by the general formula [I] or [II]:R.sup.1.sub.m Al(OR.sup.2).sub.3-m [I]R.sup.3.sub.n Al(OSiR.sup.4.sub.3).sub.3-n [II]wherein R.sup.1, R.sup.2, and R.sup.3 are selected from hydrocarbon radicals, R.sup.4 is selected from the group consisting of hydrocarbon, alkoxy, and aryloxy radicals, and m and n are positive numbers of 0<m<3 and 0<n<3. This catalyst has a significantly high polymerization activity, and the thus produced olefin polymer or copolymer has a narrow composition distribution, a high bulk density, and uniform grain size with little powdery product.

Abstract: A process for the production of EPDM comprising reacting ethylene, propylene, ethylidene norbornene, and hydrogen, in the gas phase, in a fluidized bed, under polymerization conditions, in the presence of a catalyst system comprising:(a) a titanium based catalyst having the formula Mg.sub.a Ti(OR).sub.b X.sub.c (ED).sub.d whereinR is an aliphatic or aromatic hydrocarbon radical having 1 to 14 carbon atoms or COR' wherein R' is an aliphatic or aromatic hydrocarbon radical having 1 to 14 carbon atoms;each OR group is alike or different;each X is independently chlorine, bromine, or iodineED is an electron donora is 0.5 to 56;b is 0, 1, or 2;c is 2 to 116; andd is greater than 1.5 a+2;(b) at least one modifier having the formula BX.sub.3 or AlR.sub.(3-b) X.sub.

Abstract: A conjugated diene compound prepolymer solution useful for the production of a vinyl aromatic compound high impact polymer material is produced by a process in which a prepolymerization mixture is prepared from 1 to 70 parts by weight of a conjugated diene compound and 30 to 99 parts by weight of a vinyl aromatic compound, and is prepolymerized at 0.degree. C. to 150.degree. C. in the presence of a prepolymerization catalyst which can cause the conjugated diene compound to be selectively polymerized but is substantially not effective for the polymerization of the vinyl aromatic compound to an extent such that the conjugated diene compound and the vinyl aromatic compound are prepolymerized at degrees of conversion of the conjugated diene compound at least 50% and 10% or less, respectively, and the resultant prepolymer solution is further polymerized by a radical or anionic polymerization method so that the vinyl aromatic compound is polymerized with the conjugated diene compound prepolymer.

Abstract: In accordance with the present invention, there are provided olefin polymerization catalyst components comprising an organoaluminum oxy-compound having less than 10% in terms of Al atom of Al component dissolving in benzene kept at 60.degree. C., and olefin polymerization catalyst containing said olefin polymerization catalyst components. The olefin polymerization catalysts have excellent polymerization activities, and are capable of giving olefin (co)polymers having a narrow molecular weight distribution and a narrow composition distribution.

Abstract: The invention relates to a process for the preparation of a predominantly crystalline ethylene/propylene copolymer having less than 15 mol % of propylene units, which can be carried out in liquid propylene as the suspending agent, if metallocene catalyst components of the formulae I, II or III are employed and the partial pressures of ethylene and propylene have a specific ratio. ##STR1## By means of this process, it is possible to increase the possible uses of polymerization plants which work with liquid propylene.

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 producing styrene-based polymers having mainly syndiotactic configuration in the presence of a catalyst comprising (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.According to this process, styrene-based polymers having mainly syndiotactic configuration can be efficiently and economically produced.

Abstract: 1-Olefin stereoblock polymer waxes having a very narrow molecular weight distribution are obtained by means of a catalyst which comprises a metallocene compound containing cyclopentadienyl radicals substituted by chiral groups, and an aluminoxane, in the presence of small amounts of hydrogen during the polymerization.

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 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: 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 and 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 aluminum alkyl cocatalyst.

Abstract: The hydrocarbon fluid friction reducing properties of homopolymers of alpha-monoolefins having 6 to 30 carbon atoms or copolymers of two or more alpha-monoolefins having 2 to about 30 carbon atoms is improved by polymerizing the monomers in the liquid state by means of a titanium halide catalyst and a two-component activator system comprised of a dialkylaluminum halide compound and a dialkylaluminum alkoxide compound.

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: The present invention provides a catalyst system for the polymerization and copolymerization of olefins with the system comprising a chiral, stereorigid hafnium metallocene catalyst in combination with an aluminum compound. The aluminum compound is preferably an alumoxane and may be a mixture of alumoxane and trimethyl aluminum. It was discovered that this mixture causes a transformation of the catalyst over time. The catalyst system may also include a solvent to increase the solubility of the metallocene catalyst. It was discovered that these catalyst systems produce useful polymer products with molecular weights greater than 10,000.

Abstract: The present invention relates to a process for the polymerization of alpha-olefins in the gas phase in the presence of a Ziegler-Natta catalyst system consisting of a catalyst comprising atoms of halogen, magnesium and a transition metal, and cocatalysts based on an organometallic compound of a metal of Groups II or III of the Periodic Table of Elements, this catalyst system being previously converted into a prepolymer or a catalyst supported on a granular substance. This process is characterized in that the polymerization in the gas phase is carried out by contacting one or more alpha-olefins, on the one hand with the prepolymer or the supported catalyst system comprising an organometallic compound (a) which is only slightly volatile as cocatalyst, and on the other hand another cocatalyst consisting of an organometallic compound (b) which is relatively volatile, in such a way that the total quantity of cocatalyst employed is relatively small.

Abstract: A novel process for the production of substantially amorphous interpolymers of propylene, ethylene and optionally a third alpha-olefin comonomer having between 4 and 8 carbon atoms per molecule is disclosed. The polymers have properties which make them applicable for use, e.g., as hot melt adhesives and as blending components in roofing materials.

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: Ethylene and alpha-olefins are homopolymerized or copolymerized with another olefin monomer in the presence of a catalyst system comprising an organo metal cocatalyst and titanium-containing catalyst component, said titanium-containing catalyst component being obtained by reacting together a porous particulate material, an organic magnesium compound, optionally an oxygen containing compound, titanium tetrachloride and a Group IIIa metal hydrocarbyl dihalide.

Abstract: Olefins are polymerized in the presence of catalysts prepared from titanium compounds prepared by reacting a titanium compound such as titanium tetraisopropoxide with a compound containing at least one aliphatic hydroxyl group.

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: Olefins are polymerized in the presence of catalysts prepared from titanium compounds prepared by reacting a titanium compound such as titanium tetraisopropoxide with a compound containing at least one aliphatic hydroxyl group.

Abstract: A polybutadiene rubber composition having an improved green strength is disclosed, which comprises a polybutadiene having a content of cis-1,4 bond of at least 70%, an average chain length of 1,4-bond of 110.about.450 and a molecular weight distribution represented by a ratio of weight-average molecular weight to number-average molecular weight of not less than 5.0.

Abstract: A process for catalytic homo- or co-polymerization of ethylene under the conditions of a pressure of at least 300 kg/cm.sup.2, a temperature of at least 180.degree. C., a contact time with a catalyst of 10 to 150 seconds and substantial absence of a solvent is disclosed. The catalyst used comprises Components A and B where Component A is a solid composition prepared by mixing and pulverizing (1) a magnesium halide, (2) titanium trichloride, and (3) an electron donor and Component B is an organoaluminum compound containing a halogen.

Abstract: Olefins are polymerized in the presence of catalysts prepared from titanium compounds prepared by reacting a titanium compound such as titanium tetraisopropoxide with a compound containing at least one aliphatic hydroxyl group.

Abstract: A polymerization activator for polymerizing ethylene comprising a dialkylaluminum monofluoride mixed with minor amounts of at least one of dialkylaluminum hydride or halide and a trialkylaluminum. The activator preferably corresponds to the general formula (AlR.sub.2 F)(AlR.sub.2 H).sub.b (AlR.sub.3).sub.c or the general formula (AlR.sub.2 F)(AlR.sub.2 X).sub.a wherein R is an alkyl group having 1 to 12 carbon atoms, 0.1.ltoreq.b.ltoreq.0.4, 0.05.ltoreq.c.ltoreq.0.2, X is a halogen other than fluorine, and 0.1.ltoreq.a.ltoreq.0.4. The activator is used in a catalytic system including at least one halide of a transition metal of Group IVB to VIB, the valency of the metal in the halide being not more than 3 and the atomic ratio of aluminum in the activator to transition metal in the catalyst lying between 0.1 and 10. The catalytic system is used in a high pressure and temperature process for polymerizing or copolymerizing ethylene.

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: A process for the stereospecific polymerization of an alpha olefin with at least three carbon atoms, with a catalyst system comprising (a) a titanium halide, and (b,i) a reaction product of an organoaluminum halide and an aromatic compound or (b,ii) a reaction product of an organoaluminum halide, an aromatic compound and a halogen-free organoaluminum compound, the aromatic compound being a hydroxy aromatic compound which comprises a sec. or tert. alkyl group in both ortho-positions in respect of the hydroxyl group.

Abstract: A rubber composition having excellent fracture properties and cut growth resistance is disclosed, which consists of 10-95 parts by weight of polybutadiene having a content of cis-1,4 bond of at least 70% and an average chain length of 1,4-sequence of 110-450 and 90-5 parts by weight of at least one diene rubber.

Abstract: A solution process for the preparation of high molecular weight homopolymers of ethylene and copolymers of ethylene and C.sub.3 -C.sub.12 .alpha.-olefins is disclosed. The process involves feeding monomer, a particular coordination catalyst and hydrocarbon solvent to a reactor, polymerizing the monomer at a temperature of 105.degree.-320.degree. C. and recovering the polymer. The catalyst is obtained by combining solutions of titanium tetrahalide and of organoaluminum compound at a temperature of less than 30.degree. C., heating the resulting admixture to a temperature of 150.degree.-300.degree. C. for a period of 10 seconds to 10 minutes and combining the thus heat-treated mixture with a solution of an organoaluminum compound. The catalyst thus obtained is fed to the process, without separation of any components of the catalyst. In an embodiment part of the titanium tetrahalide may be replaced with vanadium oxytrihalide.

Abstract: A novel catalytic system is disclosed which is especially adapted for the polymerization and the copolymerization of aliphatic conjugated diolefines, the system comprising an organic compound of aluminum, a Lewis acid containing at least one halogen, and an organic compound of a lanthanide metal. The catalyst system has outstanding and hitherto unparalleled activity. The method of preparation of the catalytic system is also described in detail.

Abstract: In a process for the preparation of a supported catalyst for the preparation of polyolefins which have a component A and a component B, wherein component A consists essentially of a reaction product ofa compound of a first metal of sub groups IV to VI of the Periodic Table of the Elements with an organic compound of a second metal of main groups I to III of the Periodic Table of the Elements, said reaction being carried out at a temperature of from -60.degree. C. to +40.degree. C., andan inorganic carrier,component B being an organo metallic compound,the improvement comprising suspending the carrier in an agent which is oxygen, sulfur, and moisture free, simultaneously and separately adding to the carrier and the agent the compounds of the first and second metals in liquid or dissolved form, excluding oxygen and moisture from the reaction, and maintaining a molar ratio of the compound of the first metal to the compound of the second metal of 1:3 to 3:1.

Abstract: A propylene polymerization catalyst comprises (a) a titanium-containing component formed by reducing titanium tetrachloride with an aluminum alkyl, optionally contacting the resulting reduced solid with a pretreatment amount of alpha-olefin monomer under polymerization conditions, and reacting the resulting product with a Lewis base complexing agent and additional titanium tetrachloride, and (b) an alkyl aluminum halide having a halogen/aluminum atomic ratio between 0.89 and 0.98 and preferably between 0.92 and 0.98.

Abstract: Butene-1 is polymerized in the presence of a catalytic system comprising a solid catalytic component (A), a trialkylaluminum compound (B), an organic acid ester (C), and an organoaluminum compound (D) at a molar ratio of (D) to (B) ranging 0.1 to 10 wherein said solid catalytic component (A) is obtained by reacting a reaction product (a) of a Grignard reagent with a chain or cyclic hydropolysiloxane having the unit ##EQU1## (R.sup.1 represents an alkyl, aryl, aralkyl, alkoxy or aryloxy group; a is 0, 1 or 2; b is 1, 2 or 3 and a+b.ltoreq.3) with at least one compound having the formulaR.sub.n.sup.2 M(.sup.(z) X.sub.z-n(R.sup.2 represents a C.sub.1 to C.sub.12 hydrocarbon moiety; M represents Al or Si; z represents atomic value of 3 or 4; X represents a halogen atom; n is 0, 1-(z-1) to obtain a reaction product (b) and further reacting said reaction product (b) with at least one titanium halide in the presence of an organic acid ester.

Abstract: A catalyst suitable for polymerizing an .alpha.-olefin, comprising a solid catalyst component [A] and an organometal compound [B], the solid catalyst component [A] being prepared by reacting an organomagnesium compound (1) soluble in a hydrocarbon medium and represented by the general formula,MgR.sub.p.sup.1 R.sub.q.sup.2 X.sub.r.Z.sub.swhereinR.sup.1 is a hydrocarbon group having 2 to 3 carbon atoms;R.sup.2 is a hydrocarbon group having 4 to 20 carbon atoms and the difference in number of carbon atoms between R.sup.1 and R.sup.2 is at least 2;X is an electronegative group having an oxygen atom, a nitrogen atom or a sulfur atom;Z is an organometal compound of aluminum, boron, beryllium, zinc, silicon or lithium;p and q each is a number above 0 to 1;r is a number from 0 to 1;p+q+r=2; ands is a number from 0.02 to 0.09,with a titanium and/or vanadium compound (2) having at least one halogen atom; and a process for polymerizing an .alpha.-olefin employing the same catalyst.