Abstract: A polybutadiene rubber having an enhanced mechanical strength is produced in such a manner that the content of water in a solution of 1,3-butadiene in an inert organic solvent is controlled to 0.2 to 5 millemoles per liter of 1,3-butadiene; a first polymerization mixture is prepared from the controlled 1,3-butadiene solution, an organic aluminum compound of the formula Al R.sub.n X.sub.3-n, wherein R=C.sub.1-6 alkyl, phenyl, or cycloalkyl, X=halogen, and n=1.5-2.0, and a cobalt compound, for example, by aging a mixture of the controlled 1,3-butadiene solution with the aluminum compound for at least one minute and then by admixing the aged mixture with the cobalt compound; the first polymerization mixture is subjected to a cis-1,4-polymerization; a second polymerization comprising the resultant cis-1,4-polybutadiene, non-reacted 1,3-butadiene, the inert organic solvent, and a catalyst comprising an organic aluminum compound of the formula AlR.sub.

Abstract: A polybutadiene rubber having an enhanced mechanical strength is produced in such a manner that the contents of water and carbon disulfide in a solution of 1,3-butadiene and carbon disulfide in an inert organic solvent is controlled to 0.2 to 5 m moles and 20 m moles or less, respectively, per liter of the 1,3-butadiene-carbon disulfide solution; a first polymerization mixture is prepared from the controlled 1,3-butadiene-carbon disulfide solution, an organic aluminum compound of the formula Al R.sub.n X.sub.3-n, wherein R=C.sub.1-6 alkyl, phenyl, or cycloalkyl, X=halogen, and n=1.5-2.

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

Abstract: A catalyst and a process for the preparation of homopolymers and copolymers of alpha monoolefins by means of a catalyst system comprising (1) a titanium halide of the formulaTiCl.sub.3 m AlCl.sub.3where m is a number from 0 to 0.5, (2) a coordination complexing agent, the use of which is optional, and (3) an appropriate conventional aluminum-alkyl, the titanium halide (1) and the complexing agent (2), if used, having been milled together before use, wherein the catalyst system employed contains, as a further component (4), a sterically unhindered phenolic compound.

Abstract: A process for producing a conjugated diene polymer, characterized by polymerizing at least one conjugated diene with a catalyst consisting of (A) a reaction product of a Lewis base and a carboxylate of a rare earth element of the lanthanum series represented by Ln(R.sup.1 CO.sub.2).sub.3 wherein Ln is a rare earth element of the lanthanum series having an atomic number of 57 to 71 and R.sup.1 is a hydrocarbon substituent having 1 to 20 carbon atoms, (B) an organic aluminum compound represented by AlR.sup.2 R.sup.3 R.sup.4 wherein R.sup.2, R.sup.3 and R.sup.4, which may be identical or different, represent hydrogen atoms or hydrocarbon substituents having 1 to 8 carbon atoms, excluding the case where all of R.sup.2, R.sup.3 and R.sup.4 are hydrogen atoms at the same time, and (C) an (alkyl)aluminum halide represented by AlX.sub.n R.sup.5.sub.3-n wherein X is Cl, Br, F or I; R.sup.5 is a hydrocarbon substituent having 1 to 8 carbon atoms; and n has a value of 1, 1.

Abstract: A process for producing highly crystalline .alpha.-olefin polymers of good particle form with high yield is provided, which comprises polymerizing .alpha.-olefin in the presence of a preactivated catalyst obtained by reacting a reaction product (I) of organoaluminum compound (A.sub.1) with electron donor (B.sub.1), with TiCl.sub.4 to obtain a solid product (II); further reacting (II) with electron donor (B.sub.2) and electron acceptor to obtain a solid product (III); during or/and after the reaction step for obtaining (II) or/and during or/and after the reaction step for obtaining (III), subjecting (II) or (III), to polymerization treatment with .alpha.-olefin; and combining the resulting final solid product with organo-aluminum compound (A.sub.2) and a reaction product (G) of organo-aluminum compound (A.sub.3) with electron donor (B.sub.3) to obtain a preactivated catalyst; and preferably, in this combination, further subjecting a part or the total of the catalyst to polymerization treatment with .alpha.

Abstract: Novel titanium compounds or complexes are prepared by reacting a titanium compound such as titanium tetraisopropoxide with a compound containing at least one aromatic hydroxyl group. These compounds and/or complexes are useful as the transition metal component in Ziegler-Natta catalysts.

Abstract: A catalyst composition is provided with an activator in combination with a primary catalyst system. The primary catalyst system is a vanadium compound and an organometallic compound of the formula RMgX, LiAlr.sub.4, or R.sub.A Al.sub.2 X.sub.B, wherein R is a hydrocarbon radical having 1 to 12 carbon atoms, X is a halogen atom; A is a number from 2 to 6, and B is a number from 0 to 4, with the proviso that the sum of A and B is 6 and that at least one of the groups attached either to the vanadium compound or to the organometallic compound is a halogen atom. The activator is bis(trichloromethyl) sulfone.

Abstract: Process for the preparation of copolymers consisting of 25-85% by wt. of ethylene, 15-75% by wt. of at least one other 1-alkene and optionally up to 20% by wt.

Abstract: Process for the preparation of copolymers consisting of 25-85% by wt. of ethylene, 15-75% by wt. of at least one other 1-alkene and optionally up to 20% by wt. of a polyunsaturated compound with application of a catalyst system containing a compound of a metal from sub-groups IV-VI of the periodic system and a compound of a metal from groups I-III of the periodic system, in which at least one hydrocarbon group is bound directly to the metal atom via a carbon atom, the polymerization being carried out in the presence of certain halogen containing activators.

Abstract: A process for producing .alpha.-olefin polymers with a controlled stereoregularity and with a higher yield is provided, which process comprises: combining a TiCl.sub.3 -containing composition obtained by reducing TiCl.sub.4, with an organoaluminum compound; thereafter subjecting the composition to a polymerization treatment with an .alpha.-olefin; before, during or after the polymerization treatment, adding an electron donor or/and an electron acceptor or a reaction product of these two; as well as adding a reaction product of a trialkylaluminum with an electron donor having a specified molar ratio of the electron donor to the trialkylaluminum selected in the range of 0.01 to 5; and polymerizing an .alpha.-olefin in the presence of the resulting preactivated catalyst.

Abstract: Polyolefin granules having an average particle size diameter greater than 600 microns, preferably about 1000 microns or greater are obtained by polymerizing monoolefins in the presence of a titanium catalyst having an average particle size diameter of greater than about 35 microns and preferably 40 to 65 microns. The titanium catalysts are obtained by reducing titanium tetrahalide in the presence of a suitable organometallic reducing compound such as diethylaluminum chloride under controlled conditions of temperature, reduction rate and concentrations to obtain a titanium halide reduced solids product seeds having an average particle size diameter of about 20 microns or greater and thereafter simultaneously and without interruption adding to the seeds containing system titanium tetrahalide and organometallic reducing compound such as diethylaluminum halide at a rate such that the reduction of titanium tetrahalide to titanium trihalide is about 6.times.10.sup.-4 to about 0.

Abstract: A titanium trichloride catalytic complex is produced by reducing titanium tetrachloride with an organo-metal compound and then treating the resulting reduced solids product with a chlorinated saturated aliphatic hydrocarbon having three to eight carbon atoms in the presence of a complexing agent. The resulting titanium trichloride complex composition, when employed as a co-catalyst with an organo-metal compound for Ziegler-type catalysts in polymerization of .alpha.-olefins, results in uniform polymer grains with unexpectedly high polymerization activity and high stereoregular polymer yielding ratios.

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: A titanium trichloride catalyst complex is produced by reducing titanium tetrachloride with an organo-metal compound and then activating the resulting reduced solids by treatment with a chlorinated hydrocarbon and titanium tetrachloride in the presence of a Lewis base complexing agent. The employment of the chlorinated hydrocarbon and titanium tetrachloride in the presence of the Lewis base complexing agent unexpectedly produces a synergistic effect whereby activating conditions, e.g., temperature, time and TiCl.sub.4 concentration can be employed resulting in a titanium trichloride complex having superior alpha-olefin polymerization properties as compared to titanium trichloride catalyst complexes obtained by treatment under the same conditions in the absence of either titanium tetrachloride or chlorinated hydrocarbon. Moreover, unexpectedly high yields of activated catalyst can be recovered without loss of activity.

Abstract: A new improved catalyst system for alpha-olefin type polymerizations includes a metal alkyl compound selected from the group consisting of R.sub.2 WY or R.sub.3 W and an organomagnesium compound R'MgX in combination with a Group IVB-VIII transition metal compound. The improved catalyst system provides both increased polymerization activity and polymers having a high degree of isotactic stereoregularity.

Abstract: Olefin polymerization catalyst can be obtained by mixing a transition metal compound (e.g. TiCl.sub.3) and an adjuvant selected from specific hindered phenols, esters of thiodialkanoic acids, esters of phosphorous acid and esters of phosphoric acid; the adjuvants are compatible with FDA regulations for food.

Abstract: A catalyst component is a transition metal composition which is obtained by reacting together an inert particulate material, an organic magnesium compound, a halogen-containing compound such as carbon tetrachloride silicon tetrachloride or boron trichloride and a specified transition metal compound such as VOCl.sub.3, bis(n-butoxy) titanium dichloride or zirconium tetrabenzyl. The catalyst component obtained can be used, together with an organic metal compound, to give an olefin polymerization catalyst. The catalyst can be used to effect the polymerization of olefin monomers, for example, the copolymerization of ethylene with an alpha-olefin monomer such as butene-1 in a fluidized bed reactor.

Abstract: A transition metal composition has the formula:TiCl.sub.3 (AlR.sub.x X.sub.3-x).sub.n E.sub.a L.sub.bwhere E is an ether or thioether; L is a defined ester, an amine or a ketone; and a and b are each greater than 0.001 and not more than 0.50. The composition has a low surface area, typically less than 50 m.sup.2 /g. The composition can be prepared by reacting titanium tetrachloride with an organo-aluminium compound, optionally heating the reaction product, contacting the reaction product at an elevated temperature with at least one of E and L and washing the product subsequent to the treatment with E. In the composition, E is conveniently di-n-butyl ether or di-isoamyl ether and L can be tetramethylethylenediamine; ethyl benzoate; benzophenone; glycerol monostearate; glycerol triacetate; glycerol tripalmitate; glycerol trimethacrylate; pentaerythritol tetra-acrylate or ethyl phenyl acetate. The composition can be used as a component of a catalyst for the polymerization of olefine monomers such as propylene.

Abstract: A process for producing .alpha.-olefin polymers is provided, which comprises: reacting an organoaluminum compound with an electron donor in a specified ratio in a solvent at a specified temperature to obtain a solid product (I); reacting solid product (I) with TiCl.sub.4 at a specified temperature in a specified ratio of Al/Ti and then removing a liquid portion from the resulting material followed by washing to obtain a solid product (II) having no free TiCl.sub.4 ; reacting solid product (II) with an electron donor and an electron acceptor in a specified ratio at a specified temperature to obtain a solid product (III); and polymerizing .alpha.-olefin(s) in the presence of a catalyst comprising a combination of solid product (III) with an organoaluminum compound. This process provides a catalyst having a high storing and thermal stability and a polymer having a uniform particle size.

Abstract: In a process for producing propylene copolymer containing about 80 to 99 mol % propylene and about 1 to 20 mol % ethylene and/or an .alpha.-olefin having 4 to 18 carbon atoms using a Ziegler-Natta catalyst, the improvement which comprises said Ziegler-Natta catalyst comprising:(A) titanium trichloride prepared by reducing titanium tetrachloride with an organoaluminum compound and activating the product; and(B) an organoaluminum compound;with the molar ratio of (B)/(A) being about 20 to 100.

Abstract: A catalyst system for the preparation of homopolymers and copolymers of alpha monoolefins comprising (1) a titanium halide of the formulaTiCl.sub.3.m AlCl.sub.3where m is a number from 0 to 0.5, (2) an ester of a carboxylic acid having an oxygen, nitrogen, or sulfur-containing heterocyclic structure, and (3) an appropriate conventional aluminum alkyl.

Abstract: A solid transition metal compound is ground with an organo-sulphur compound which is a defined aromatic sulphone, sulphonamide or sulphide such as diphenylsulphone, N,N-diethyl-4-phenoxy benzenesulphonamide or phenoxathiin. A Lewis Acid such as titanium tetrachloride can be present during the grinding operation. Alternatively there may be present, during the grinding, an oxidizing agent capable of generating tetravalent titanium in the presence of titanium trichloride, for example carbon tetrachloride or gaseous oxygen. The grinding can be effected in a ball-mill or a vibrating mill. The materials may be added during the grinding and the temperature may be varied during the grinding. A liquid which is a solvent for the organo-sulphur compound or complexes thereof with aluminum chloride may be present during a part of the grinding.

Abstract: A catalyst system useful for the polymerization of olefins which comprises(A) at least one organometallic compound of a typical metal belonging to I, II and III group of Periodic table,(B) a reaction production of (i) a solid organomagnesium compound of the formula: MgR.sub.l X.sub.2-1..alpha.D wherein R is a hydrocarbon group having 1 to 20 carbon atoms, X is a halogen atom, D is a Lewis base, l is a number in the range of 0<l<2 and .alpha. is a number in the range of 0.ltoreq..alpha.<1.5, (ii) a phenol compound, (iii) a Lewis base, and (iv) a titanium compound and/or vanadium compound, and optionally(C) a Lewis base in an amount of up to 1 mole to 1 mole of the component (A),and a process for homo- or copolymerization of olefins by using the catalyst system. The catalyst system of the present invention shows excellent activities not only per the transition metal compound but also per the solid catalyst and can give polyolefins having a high stereo-regularity.

Abstract: A catalyst composition is provided with an activator in combination with a primary catalyst system. The primary catalyst system is a vanadium compound and an organometallic compound of the formula RMgX, LiAlr.sub.4, or R.sub.A Al.sub.2 X.sub.B, wherein R is a hydrocarbon radical having 1 to 12 carbon atoms, X is a halogen atom; A is a number from 2 to 6, and B is a number from 0 to 4, with the proviso that the sum of A and B is 6 and that at least one of the groups attached either to the vanadium compound or to the organometallic compound is a halogen atom.

Abstract: A supported high efficiency catalyst component for polyolefin production and methods of making and using the same are disclosed. An enhanced support made from the materials comprising a support base, an inorganic Lewis acid and an electron donor is combined with an active transition metal compound and optionally a second electron donor to form the catalyst component. Additionally, a dehydrating agent may be pre-combined with the support base in the production of the catalyst support. The methods of producing such catalyst supports and catalyst components are performed by milling in the absence of any solvent. Such catalysts produce polymer of such high quality and quantity that polymer extraction and polymer deashing are not necessary.

Abstract: A catalyst for the solution polymerization of .alpha.-olefins is prepared by admixing component (A) with an organometal component (B), component (A) being prepared by reacting a specific hydrocarbon-soluble organomagnesium compound with an aluminum compound and contacting the obtained product with a titanium and/or vanadium compound.

Abstract: A process for polymerizing an .alpha.-olefin comprising contacting the olefin in liquid phase at a temperature of about 120.degree. to 320.degree. C. with a catalyst comprising a component (A) and an organometal component (B), the component (A) being produced by reacting a hydrocarbon-soluble organomagnesium component (i) of the formula,M.sub..alpha. MgR.sub.p.sup.1 R.sub.q.sup.2 X.sub.r.sup.1 X.sub.s.sup.2 D.sub.t.alpha., p, q, r, s and t each independently is O or a number greater than 0,p+q+r+s=m.alpha.+2O.ltoreq.(r+s)/(.alpha.+1)<2,m is the valence of M, M is a metal of the 1st to 3rd groups of the Periodic Table,R.sup.1 is a hydrocarbon group having 1 to 20 carbon atoms, R.sup.2 is a secondary or tertiary alkyl group having 3 to 20 carbon atoms,X.sup.1 and X.sup.2 each independently is a hydrogen atom or an organic electronegative group containing O, N or S,D is an electron donor,with a compound (ii) of the formula,R.sub.a.sup.3 C Y.sub.4-awhereinR.sup.

Abstract: Catalysts for polymerization of olefin which comprise a solid catalyst component (A) and an organometallic compound with a heterocyclic carboxylic acid ester (B), wherein the solid catalyst component (A) is obtained by reacting or/and grinding a special magnesium compound (1), a titanium halide (2) and a carboxylic acid ester (3); and the heterocyclic carboxylic acid ester is N-, S- or O-containing heterocyclic compound, and processes for polymerization of olefin employing such a catalyst.

Abstract: Propylene is polymerized with an improved titanium chloride catalyst. The improved titanium chloride catalyst is prepared by treating TiCl.sub.4 with an aluminum alkyl and treating the resulting titanium chloride catalyst with carbon dioxide and a Lewis base, such as di(n-butyl) ether in a hydrocarbon medium at an elevated temperature.

Abstract: A component of a polymerization catalyst is prepared by reacting an organomagnesium halide with a solid, inorganic oxide, then reacting the product with a Lewis Base compound, particularly an ester and finally with titanium tetrachloride. After reacting the organo-magnesium halide with the inorganic oxide it may be treated with a halogenating agent before it is reacted with the Lewis Base compound. The product obtained is combined with an organo-aluminium compound preferably together with a Lewis Base and used to polymerize an olefin monomer particularly propylene or mixtures of ethylene and a 1-olefine containing at least 4 carbon atoms. The catalyst system has a high activity, is stereospecific and has a lower proportion of halogen than some other catalyst systems.

Abstract: A titanium trichloride catalytic complex is produced by reducing titanium tetrachloride with an organo-metal compound and then treating the resulting reduced solids product with a chlorinated saturated hydrocarbon having two carbon atoms in the presence of a complexing agent. The resulting titanium trichloride complex composition, when employed as a co-catalyst with an organo-metal compound for Ziegler-type catalysts in polymerization of .alpha.-olefins, results in uniform polymer grains with unexpectedly high polymerization activity and high stereoregular polymer yielding ratios.

Abstract: An alpha olefin is polymerized to obtain highly crystalline polymers by subjecting the alpha olefin to polymerization conditions using as a catalyst therefor the reaction product of (A) an aluminum hydrocarbyl treated with an electron donor compound and (B) a support containing chlorine, bromine and magnesium, wherein the molar ratio of bromine to chlorine ranges between about 1:99 to about 50:50, preferably between about 2.5:97.5 to about 20:80, and most preferably between about 2.5:97.5 to about 15:85, obtained by reacting an organo magnesium compound with a mixture of chlorinated and brominated aluminum compounds, the support having been additionally treated with an electron donor compound and with titanium tetrachloride. The molar ratio of magnesium to combined chlorine and bromine in the support is not critical but generally ranges between about 1:1.6 and about 1:2.0, preferably between about 1:1.8 and about 1:2.0.

Abstract: A new improved catalyst system for alpha-olefin type polymerizations, includes at least one metal alkyl compound having the formula R.sub.3 '' M in combination with a Group IVB-VIII transition metal compound on a support and at least one hindered Lewis base and at least one unhindered Lewis base wherein R is selected from the group consisting of C.sub.1 to C.sub.20 secondary or tertiary alkyl, cycloalkyl, alkenyl or aralkyl groups; M is selected from the group consisting of aluminum, gallium, or indium. The improved catalyst system provides polymers having increased isotactic stereoregularity as well as lower catalyst residue.

Abstract: A process for producing .alpha.-olefin polymers is provided which comprises:reacting an organoaluminum compound (A.sub.1) with an electron donor (B.sub.1) to obtain a reaction product (I);reacting (I) with TiCl.sub.4 to obtain a solid product (II);reacting (II) with an electron donor (B.sub.2) and an electron acceptor to obtain a solid product (III);combining (III) with an organoaluminum compound (A.sub.2) and a reaction product (G) of an organoaluminum (A.sub.3) with an electron donor (B.sub.3) ((III), (A.sub.2) and (G) being referred to as catalyst components), and in this combination, subjecting a part or the whole of the catalyst components to polymerization treatment with an .alpha.-olefin at least in the presence of (III) and said (A.sub.2) to obtain a preliminarily activated catalyst;andpolymerizing an .alpha.-olefin in the presence of the catalyst.

Abstract: A method for producing crystalline copolymers of propylene (major component), ethylene and an .alpha.-olefin having 4 to 12 carbon atoms, superior in any of various practical physical properties such as cold-resistance, transparency, heat-seal temperature, percentage shrinkage, etc. is provided, wherein a catalyst solution obtained by mixing together a titanium trichloride composition (obtained by mixing and milling a titanium trichloride with a mixed reaction product of TiCl.sub.4 with an ether), a dialkylaluminum halide, an electron-donor compound and an inert solvent, is activated in advance of copolymerization, by feeding propylene into the solution under specified feeding conditions, and copolymerization is carried out by feeding propylene and said .alpha.-olefin simultaneously and continuously, while feeding ethylene intermittently into the gas phase part of the polymerization zone containing the solution.

Abstract: A new improved catalyst system for alpha-olefin type polymerizations, includes at least one metal alkyl compound having the formula R'"M in combination with a Group IVB-VIII transition metal compound on a support and at least one hindered Lewis base and one unhindered Lewis base and a Group IA-IIIA metal salt of a sterically hindered carboxylate, alkoxide or aryloxide, wherein R'" is selected from the group consisting of C.sub.1 to C.sub.20 primary alkyl, alkenyl or aralkyl groups, or a hydride, and M is selected from the group consisting of aluminum, gallium, or indium. The improved catalyst system provides polymers having increased isotactic stereoregularity as well as lower catalyst residue.

Abstract: A component of a polymerization catalyst is prepared by reacting an organo-magnesium compound, or a complex with an organo-aluminium compound, with a solid, inorganic oxide, then with a halogenating agent such as silicon tetrachloride or hydrogen chloride, and then reacting the product with a Lewis Base compound, particularly an ester and finally with titanium tetrachloride. The product obtained is combined with an organo-aluminium compound, preferably together with a Lewis Base, and used to polymerize an olefin monomer particularly propylene or mixtures of ethylene and a 1-olefin containing at least 4 carbon atoms. The catalyst system has a high activity, is stereospecific and has a lower proportion of halogen than some other catalyst systems.

Abstract: A transition metal composition has the formula:TiCl.sub.3 (AlR.sub.x X.sub.3-x).sub.n E.sub.a L.sub.bwhere E is an ether or thioether; L is an organic sulphur-containing compound; and a and b are each greater than 0.001 and not more than 0.50. The composition has a low surface area, typically less than 50 m.sup.2 /g. The composition can be prepared by reacting titanium tetrachloride with an organo-aluminium compound, optionally heating the reaction product, contacting the reaction product at an elevated temperature with at least E, and preferably L and washing the product. In the composition, E is conveniently di-n-butyl ether or di-isoamyl ether and L can be phenoxathiin or diphenyl sulphone. The composition can be used as a component of a catalyst for the polymerization of olefine monomers such as propylene.

Abstract: A transition metal compound containing at least one .pi.-bonded arene is contacted with an inorganic oxide, hydroxide, oxyhalide, hydroxyhalide or halide. The transition metal compound can be a compound such as titanium(O)ditoluene or TiCl.sub.2.2AlCl.sub.3 durene. The inorganic compound is preferably of high surface area and this may be inherent in the compound or can be achieved by a grinding procedure. The inorganic compound can be treated with a halogen containing compound either before, during or after the contacting with the transition metal compound. The product of the contacting is useful either as catalyst for the polymerization of unsaturated hydrocarbon monomers or as a component of such a catalyst. When used as a component of an olefine polymerization catalyst, the transition metal product can be mixed with an organo-aluminum compound and a Lewis Base compound such as an ester.

Abstract: A titanium trichloride catalyst component containing a minor amount of prepolymerized alpha-olefin and useful in the polymerization of alpha-olefins is produced by reducing titanium tetrachloride with an organoaluminum compound at low temperatures and then treating the resulting reduced solids product with about 1 to 1,000 wt. % alpha-olefin so as to obtain a prepolymerized titanium trichloride reduced solid. The prepolymerized reduced solid can thereafter be activated to a highly active prepolymerized titanium trichloride by treating the prepolymerized reduced solid with a halogenated hydrocarbon and a Lewis base complexing agent or titanium tetrachloride and a Lewis base complexing agent. The prepolymerized reduced solid and the prepolymerized activated titanium trichloride manifests substantially no evidence of friability upon being subjected to mechanical shearing forces.

Abstract: A process for preparing an olefin polymer or copolymer by polymerizing or copolymerizing an olefin containing at least 3 carbon atoms which may contain at most 10 mole % of ethylene and/or a diene, in the presence of a catalyst composed of (A) a solid titanium catalyst component prepared by(1) reacting a mechanically pulverized product of an organic acid ester and a halogen-containing magnesium compound, with an active hydrogen-containing organic compound in the absence of mechanical pulverization,(2) reacting the resulting reaction product with an organometallic compound of a metal of Groups I to III of the periodic table in the absence of mechanical pulverization, and(3) washing the resulting solid reaction product with an inert organic solvent, reacting the washed solid reaction product with a titanium compound in the absence of mechanical pulverization, and separating the solid from the reaction system,and (B) an organometallic compound of a metal of Groups I to III of the periodic table; and a catalyst u

Abstract: A process for making crystalline polymers or copolymers of alpha-olefins containing 3 to 8 carbon atoms, such as polypropylene, by polymerization with a catalyst consisting of a combination of titanium chloride and an organic aluminium compound, in the presence of a stereospecificity additive.This stereospecificity additive is a cyclic polyether of the crown ether type, which may contain sulphur atoms and/or nitro radicals; this additive may be used together with an activator.The process produces polymers or copolymers with a high isotacticity index, while keeping catalyst activity sufficiently high.

Abstract: A catalyst system prepared by mixing components (A), (B) and (C):(A) a solid titanium component prepared from an organo-magnesium compound, a silicon halide compound and/or an aluminum halide compound, an electron donor and TiCl.sub.4,(B) an organoaluminum activator, and(C) an electron donor.

Abstract: A new improved catalyst system for alpha-olefin type polymerizations includes a metal alkyl cocatalyst having the formula T.sub.n MR'.sub.3-n in combination with a Group IVB-VIII transition metal compound on a support and a Lewis base wherein n is equal to one or two, T is equal to R.sub.3 DCH.sub.2, and wherein D is selected from the group consisting of Si, Ge or Sn, R is methyl or ethyl, and R' is selected from the group consisting of C.sub.1 to C.sub.8 primary alkyl or aralkyl groups including unhindered branched groups and M is selected from the group consisting of aluminum, gallium, or indium. The improved catalyst system provides both increased polymerization activity and polymers having a high degree of isotactic stereoregularity as well as lower catalyst residue.

Abstract: A component of a polymerization catalyst is prepared by reacting an organo-magnesium halide with a solid, inorganic oxide, then reacting the product with a Lewis Base compound, particularly an ester and finally with titanium tetrachloride. After reacting the organo-magnesium halide with the inorganic oxide it may be treated with a halogenating agent before it is reacted with the Lewis Base compound. The product obtained is combined with an organo-aluminium compound preferably together with a Lewis Base and used to polymerize an olefine monomer. The catalyst has a high activity, is stereospecific and has a lower proportion of halogen than some other catalyst systems.

Abstract: There are disclosed new catalyst-forming components obtained by reacting at least the following substances:(a) a halogenated Ti compound containing at least one Ti-halogen bond;(b1) a support an essential constituent of which is a mixture of an oxygenated Mg compound with an adduct between a Mg dihalide and at least one electron-donor compound and/or with the product of de composition of said adduct containing Mg dihalide; and/or(b2) the product obtained by treating an oxygenated Mg compound with an electron-donor compound.Also disclosed are catalysts prepared from said new catalyst-forming components, as is use of the catalysts in the polymerization of olefins, more particularly olefins CH.sub.2 .dbd.CHR in which R is an alkyl or aryl radical having 1-8 carbon atoms, of mixtures of said olefins and of mixtures thereof with ethylene.

Abstract: A process for making crystalline polymers or copolymers of alpha-olefins containing 3 to 8 carbon atoms, such as polypropylene, by polymerization with a catalyst consisting of a combination of titanium chloride and an organic aluminium compound, in the presence of a stereospecificity additive.This stereospecificity additive has the formula:R.sub.1 --O--(C.sub.p H.sub.2p)--S--R.sub.2,where:R.sub.1 and R.sub.2 are alkyl radicals containing 1 to 4 carbon atoms or are linked together to form a divalent --(C.sub.m H.sub.2m)--radical, andp and m are integers each with a value of 1 to 6;this additive may be used in the presence of an activator.

Abstract: A titanium trichloride-catalyzed process for stereospecific polymerization of alpha-olefins, particularly propylene, to produce polymers of relatively high bulk density comprises employing as the TiCl.sub.3 catalyst component, used with an aluminum alkyl cocatalyst, a 0.1 to 30 millimicron fraction of a TiCl.sub.3 composition produced by(a) reacting TiCl.sub.4 with a complexing agent in a molar ratio of from 1:0.3 to 1:2;(b) reacting an organo-aluminum compound with a complexing agent in a molar ratio of at most 1:0.25;(c) reducing the complexed TiCl.sub.4 with the complexed organo-aluminum compound over a period of less than one hour at a temperature within the range 60.degree. to 110.degree. C. to produce TiCl.sub.3 particles having an average particle size of from 50 to 500 .mu.m;(d) subjecting the TiCl.sub.3 particles to a treatment to reduce the average particle size thereof to less than 50 .mu.m, and(e) classifying the TiCl.sub.

Abstract: New catalyst components comprising compounds containing titanium, magnesium and halogens, and catalysts for polymerizing olefins obtained by mixing said components with organometallic Al compounds are disclosed.