Abstract: A titanium trichloride catalytic component manufactured by pulverizing an eutectic mixture or a crystalline compound consisting of titanium trichloride and aluminum chloride or a pulverized matter thereof together with an organic acid or an acid anhydride thereof at a temperature between 35.degree. and 100.degree. C. in the absence of an inert solvent and without any extractive process carried out with such an inert solvent; and a method for carrying out homo-polymerization or co-polymerization of .alpha.-olefin by using a catalyst system consisting of the above mentioned titanium trichloride catalytic component and an organoaluminum compound.

Abstract: An olefin is polymerized using a catalyst obtained by contacting (1) at least one of silicon or aluminum dioxide, (2) a compound of the formula ROH wherein R is a hydrocarbon radical having 1 to 20 carbon atoms, and (3) a substance obtained by supporting a titanium or a vanadium compound on a magnesium or manganese halide.

Abstract: This invention relates to a process for producing an .alpha.-olefin polymer having a high stereoregularity in a high yield by polymerizing .alpha.-olefin in the presence of a catalyst composed of solid catalyst component (I) prepared by contacting (A) magnesium halide, (B) aromatic carboxylic acid ester, (C) halogen compound of titanium, and (D) siloxyaluminum compound with each other, and (II) an organometallic compound of a metal of Group I to III in the Periodic Table.

Abstract: A process for polymerizing alpha-olefins in the presence of a catalyst comprising two components. Component A is obtained by mixing a milled mixture of magnesium and particulate inorganic solid with an alcohol and then contacting the resultant product with a tetravalent halogenated titanium compound. Component B comprises a metallic hydride or an organometallic compound, e.g., an organoaluminum compound.

Abstract: Catalysts useful in the polymerization of olefins, more particularly of ethylene and mixtures thereof with higher alpha-olefins and/or diolefins, are disclosed. The new catalysts are obtained by mixing a hydride or organometallic compound of a metal belonging to Groups I to III of the Mendelyeev Periodic System with the product obtained by contacting a titanium tetrahalide with a support comprising an anhydrous magnesium or zinc halide in an active form, under particular conditions.

Abstract: A process for the manufacture of poly-.alpha.-olefins by polymerizing .alpha.-olefins by means of a catalyst system comprising (1) a titanium-containing component obtained from (1.1) a compound of the formula TiCl.sub.3.1/3AlCl.sub.3 and (1.2) an organic electron donor, containing phosphorus, nitrogen and/or oxygen atoms, which has been milled with the compound of the formula TiCl.sub.3.1/3AlCl.sub.3 (1.1), in order to form a complex compound, the milling being carried out without assistants or additives in a vibratory ball mill under specific acceleration conditions and at a temperature which is from 4.degree. to 10.degree. C. below the temperature at which the particles of the material being ground begin to agglomerate, and (2) an aluminum-containing component, in which process the titanium-containing component (1) of the catalyst system used is one which has been treated, after milling and before polymerization, with (i) titanium tetrachloride and (ii) an ether and/or an ester.

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: According to this invention there is provided a process for polymerizing or copolymerizing olefins using a catalyst consisting of:[A]a solid component obtained by contacting(1) a reaction product resulting from heat reaction of a magnesium oxide and an aluminum trihalide with(2) a titanium halide and/or an addition product of a titanium halide and an aromatic carboxylic acid ester, and[B]an organometallic compound and/or an addition product of an organometallic compound and an aromatic carboxylic acid ester,or alternatively, using a catalyst consisting of acid components [A] and [B] plus [C] an aromatic carboxylic acid ester.

Abstract: A method for producing .alpha.-olefin polymers or copolymers by the use of an improved catalyst having a specific solid product combined with an organoaluminum compound is provided.The specific solid product (III) is prepared byreacting a trivalent metal halide with a specified divalent metal compound to obtain a solid product (I);reacting this product (I) with a transition metal compound of 4a group or 5a group of the Periodic Table in the presence of a polysiloxane to obtain a solid product (II); andfurther reacting this product (II) with at least two transition metal compounds of 4a group or 5a group, consisting of at least one member selected from the group (A) consisting of halogen-containing transition metal compounds of 4a group or 5a group, and at least one member selected from the group (B) consisting of halogen-free transition metal compounds of 4a group or 5a group to obtain the solid product (III).By employing this improved solid product (III) as a catalyst component, it is possible to produce .

Abstract: A process for the preparation of homopolymers and copolymers of .alpha.-monoolefins by means of a Ziegler-Natta 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) an oxygen compound of the formula ##STR1## where R.sup.1 is hydrogen, C.sub.1 -C.sub.4 -alkyl or C.sub.1 -C.sub.4 -alkoxy, R.sup.2 is C.sub.1 -C.sub.4 -alkyl and n is an integer from 0 to 3, and (3) an appropriate conventional aluminum-alkyl, the titanium halide (1) and the oxygen compound (2) having been milled together before use, wherein the catalyst system employed contains, as a further component (4), a phenolic compound of the formula ##STR2## where R.sup.3 is C.sub.1 -C.sub.6 -alkyl, R.sup.4 is hydrogen or C.sub.1 -C.sub.6 -alkyl, R.sup.5 is hydrogen or a saturated hydrocarbon radical of not more than 30 carbon atoms which may also contain not more than a total of 6 ether groups and/or ester groups, R.sup.6 is C.sub.2 -C.sub.24 -alkyl and o is an integer from 1 to 6.

Abstract: A catalyst system is made up of a catalyst and a cocatalyst. The catalyst component comprises a magnesium chloride support, a titanium trichloride, an aluminum trichloride and an organic phosphite. The cocatalyst comprises an organoaluminum compound. Exemplary of such a system is a MgCl.sub.2 supported TiCl.sub.3.1/3AlCl.sub.3 plus triphenyl phosphite as the catalyst and triethylaluminum plus diethylaluminum chloride and ethyl anisate as the cocatalyst. Such catalyst systems give both high productivity and low solubles in the polymerization of propylene. For ethylene polymerization, the cocatalyst can simply be triethylaluminum.

Abstract: According to the present invention, there is provided a process for preparing polyolefins comprising polymerizing or copolymerizing olefins using as catalyst a titanium-containing solid and an organometallic compound of a metal of Groups I to IV of the Periodic Table, said titanium-containing solid consisting of a reaction product obtained by copulverizing (1) a magnesium halide and/or a manganese halide, (2) an organohalide and (3) a tetravalent and/or a trivalent titanium compound(s).

Abstract: A process for preparing a polymer or copolymer of an olefin having at least 3 carbon atoms which comprises polymerizing or copolymerizing an olefin having at least 3 carbon atoms and containing 0 to 10 mole % of another olefin or diolefin in the presence of a catalyst composed of (i) a solid titanium catalyst component and (ii) an organoaluminum compound; wherein the solid titanium catalyst component is obtained by contacting(1) a magnesium containing copulverization product comprising (A) an aluminum or germanium compound selected from the group consisting of aluminum compounds of the formula AlR.sub.n X.sub.3-n wherein R is a hydrogen atom, or an alkyl, alkenyl, aryl, alkoxy, aryloxy or acyloxy group optionally having a substituent, X is a halogen atom, and O<n.ltoreq.3, and germanium compounds of the formula GeR.sub.m X.sub.4-m wherein R and X are as defined above, and 0.ltoreq.m.ltoreq.

Abstract: Magnesium metal is contacted with an organic halide in the absence of an ether or other complexing diluent to produce a magnesium reducing agent for converting titanium tetrahalide to titanium trihalide. In a first embodiment, the magnesium metal, organic halide, and titanium tetrahalide are introduced into a mill and milled. In a second embodiment, the organic halide is metered dropwise onto the magnesium metal in the absence of any extraneous diluent, and the resulting magnesium reducing agent is thereafter added to a titanium tetrahalide and milled. In a third embodiment, an organic halide containing the titanium tetrahalide is metered dropwise onto magnesium metal in the absence of any extraneous diluent. In each instance the resulting titanium trihalide catalyst component is contacted with an organoaluminum compound activator and used for the polymerization of olefins, preferably the polymerization of propylene.

Abstract: Polymerization of alpha monoolefins employing a catalyst comprising (A) a component formed by intensive mixing (milling) of titanium halide, a Lewis base, anhydrous magnesium or manganese chloride, and an unsaturated additive, (B) trihydrocarbylaluminum and, optionally, a Lewis base, and optionally (C) a dihydrocarbyl aluminum halide.

Abstract: A process for producing olefin polymers comprising contacting an ethylenically unsaturated monomer comprising at least one olefin monomer with a catalyst system comprising a combination of a catalyst component I and a catalyst component II as described hereunder:Catalyst component IA solid product obtained by contacting the following constituents (a), (b) and (c) or (a), (b), (c) and (d) together:(a) A solid reaction product of a magnesium compound containing a hydroxyl group attached to magnesium and an organoaluminum compound represented by the formula R.sub.n AlX.sub.3-n wherein R represents a hydrocarbon residue having from 1 to 20 carbon atoms, X represents a halogen atom and n represents a number of greater than zero but not greater than 1.5, i.e. 0<n.ltoreq.1.

Abstract: Alpha olefins are polymerized employing a catalyst which forms on mixing a first component resulting from admixture of a halogenated titanium compound and a magnesium or manganese halide; a second component which is an organoaluminum compound; a third component which is a Lewis base; and a fourth component which is an organoaluminum monohalide.

Abstract: Process for the preparation of a porous, pure silica which is particularly suitable as a catalyst support for a chromium-oxide catalyst used in polymerizing of olefins. The process comprises the steps of converting a silicon-halogen compound to a silica and then admixing with water to form a silica gel. The gel is then spray-dried to achieve the required particle size and pore volume.The silica can then be made into a catalyst by placing on the support a chromium compound and then heating in a non-reducing atmosphere.

Abstract: Process for the preparation of a porous, pure silica which is particularly suitable as a catalyst support for a chromium-oxide catalyst used in polymerizing of olefins. The process comprises the steps of converting a silicon-halogen compound to a silica and then admixing with water to form a silica gel. The gel is then dried and ground to a predetermined particle size. The silica can then be made into a catalyst by placing on the support a chromium compound and then heating in a non-reducing atmosphere.

Abstract: A solid compound of a transition metal is ground in the presence of aluminum chloride; titanium tetrachloride and at least one specified organic sulphur-containing compound are added, the whole mixture is ground and the ground product is then washed with an aromatic liquid. The transition metal compound is typically titanium trichloride. The organic sulphur-containing compound can be a sulphone, a sulphonamide or a condensed ring system containing at least one heterocyclic sulphur atom. The organic sulphur-containing compound can be diphenylsulphone. The solid compound of the transition metal may be one which also includes aluminum chloride. The quantities of materials added to the transition metal compound are, for each mole of the transition metal compound, 0.10 up to 2.50 moles of the organic sulphur-containing compound, 0.01 up to 0.50 mole of titanium tetrachloride and 0.01 up to 2.50 moles of aluminum chloride.

Abstract: There is disclosed a process for the stereoregular polymerization of alpha olefins or mixtures thereof with ethylene conducted in the presence of highly active and stereospecific new catalysts. The catalysts are obtained from the reaction of a particular Al-alkyl compound which is at least in part in the form of a complex and/or a substitution reaction product with an electron-donor compound free from ester groups of oxygenated organic and inorganic acids, with a supported component characterized by having surface area exceeding certain values or by showing a particular X-rays spectrum and which is obtained by contacting a halogenated Ti compound, preferably in the form of a complex with an electron-donor compound, with a support comprising a Mg or Mn dihalide in an active state. In the catalysts the ratio between the Ti compound expressed in Ti g-atoms and the g-moles of the electron donor compounds is lower than 0.3.

Abstract: A process for polymerizing or copolymerizing .alpha.-olefins having at least 3 carbon atoms or copolymerizing .alpha.-olefins having at least 3 carbon atoms with not more than 50 mole % of ethylene in the presence of a catalyst composed of an organometallic compound of a metal of Groups I to III of the periodic table and a titanium catalyst component supported on a halogen-containing magnesium compound, said titanium catalyst component being a solid reaction product obtained by treating (i) a mechanically copulverized product of a halogen-containing compound and an organic acid ester with (ii) an organo-metallic compound of a metal of Groups I to III of the periodic table, and then reacting the resulting solid product with (iii) a titanium compound in the absence of mechanical pulverization.

Abstract: Stereospecific polymerization of .alpha.-olefins is carried out with use of a catalyst comprising an activated titanium component obtained by treating products of copulverization of magnesium halides and aromatic orthocarboxylic acid esters with titanium halides, an organoaluminum compound and an electron donative compound. .alpha.-Olefin polymers of high stereospecificity are thus obtained with a high polymerization activity.

Abstract: The present invention discloses improved catalysts for polymerizing or copolymerizing olefins and a process for the production of polyolefins comprising a polymerization or copolymerization of olefins by the use of said catalysts. According to the invention there is provided a process for the production of polyolefins by polymerizing or copolymerizing olefins using as the catalyst a solid component containing a titanium compound and/or a vanadium compound and an organometallic compound, said solid component comprising a substance obtained by co-pulverizing (1) a metal halide selected from the group consisting of magnesium halides and manganese halides, (2) a compound represented by the general formula Mg(OR).sub.n X.sub.2-n in which n is a number of the range 0<n.ltoreq.2, X represents a halogen atom and R is a hydrocarbon radical containing from 1 to 20 carbon atoms and may be alike or different and (3) a titanium compound and/or a vanadium compound.

Abstract: The present invention discloses improved catalysts for polymerizing or copolymerizing olefins and a process for the production of polyolefins comprising a polymerization or copolymerization of olefins by the use of said catalysts. According to the invention there is provided a process for the production of polyolefins by polymerizing or copolymerizing olefins using as the catalyst a solid component containing a titanium compound and/or a vanadium compound and an organometallic compound, said solid component comprising a substance obtained by co-pulverizing (1) a metal halide selected from the group consisting of magnesium halides and manganese halides, (2) a compound represented by the general formula B(OR).sub.n X.sub.3-n X3 in which n is a number of the range 0<n.ltoreq.3, X represents a halogen atom and R is a hydrocarbon radical containing from 1 to 20 carbon atoms and may be alike or different and (3) a titanium compound and/or a vanadium compound.

Abstract: An organic halide is reacted with magnesium metal in the absence of an ether or other complexing diluent, preferably in the absence of any extraneous diluent to produce a magnesium reducing agent. In one embodiment, the halide is added dropwise to the magnesium metal. The resulting magnesium reducing agent is then washed with an unreactive liquid hydrocarbon. An organoaluminum compound is mixed with the magnesium reducing agent either before or after the washing. The resulting cocatalyst produced by contacting the magnesium reducing agent with the organoaluminum compound is contacted with a titanium tetrahalide to give a catalyst. This catalyst is useful in the polymerization of 1-olefins and is of particular utility in the polymerization of ethylene at high productivity rates.

Abstract: A transition metal product, for example a titanium trichloride material, is obtained by milling a solid transition metal compound with a carboxylic acid or an ester thereof, for example methylmethacrylate and contacting with an organo-Lewis Base such as an amine, an organo-phosphorus compound or a sulphone derivative. The organo-Lewis Base may be milled with the transition metal compound or may be added to the transition metal compound as a solution in an inert liquid. The product can be used as a component of an olefine polymerization catalyst.

Abstract: A process for the manufacture of homopolymers and copolymers of .alpha.-monoolefins by polymerizing the monomer or monomers by means of a Ziegler-Natta catalyst comprising (I) a titanium trichloride component and (II) an aluminum-alkyl component, wherein the titanium trichloride component (I) employed is obtained by (1) in a first stage moistening a suitable conventional catalyst component, consisting entirely or substantially of titanium trichloride, with a hydrocarbon mixture comprising a liquid alkane hydrocarbon and a liquid benzene hydrocarbon and (2) in a second stage drying the catalyst component, moistened with the hydrocarbon mixture, under an inert gas, with constant mechanical mixing, within a certain period, at a temperature which is from 5.degree. to 50.degree. C. above the boiling point of the highest-boiling hydrocarbon present in the hydrocarbon mixture which has been used to moisten the component.

Abstract: A magnesium reducing agent is prepared by reacting an organic halide and magnesium metal in the absence of an ether or other complexing diluent, preferably in the absence of any extraneous diluent, to form a magnesium reducing agent which is thereafter milled with an organoaluminum compound to form a cocatalyst. In one embodiment the halide is added dropwise to the magnesium metal. The resulting milled product is thereafter contacted with a titanium tetrahalide to form a catalyst. This catalyst is suitable for olefin polymerization and particularly suitable for the polymerization of ethylene.

Abstract: There is disclosed a process for the stereoregular polymerization of alpha-olefins or mixtures thereof with ethylene, conducted in the presence of highly active and stereospecific new catalysts. The catalysts are obtained from the reaction of a particular Al-alkyl compound which is at least in part in the form of a complex and/or a substitution reaction product with an ester of an oxygenated organic or inorganic acid, with a supported component characterized by having surface area exceeding certain values or showing a particular X-rays spectrum, and obtained by contacting a Ti halogenated compound, preferably in the form of a complex with an electron-donor compound, with a support comprising a Mg or Mn bihalide in an activated condition.In the catalysts the ratio between the Ti compound, expressed in Ti g-atoms, and the g moles of the ester and the electron-doner compound, when present, is lower than 0.3.

Abstract: A titanium trihalide is ground with an organic Lewis Base compound which contains at least one phosphorus atom, and optionally at least one nitrogen atom, and a titanium tetrahalide, the Lewis Base and the titanium tetrahalide being used in amounts of 5 to 75, preferably 5 to 50%, molar and 1 to 50, preferably 5 to 30% molar respectively relative to the titanium trihalide. The materials are conveniently milled together and the milled product can be used as a component of an olefine polymerization catalyst and when such catalysts are used to polymerize propylene a high activity is achieved together with satisfactory stereospecificity.

Abstract: A process for polymerizing or co-polymerizing propylene in the presence of a catalyst consisting essentially of (A) a solid catalyst component which is prepared by contacting(1) a copulverized material obtained by copulverizing a magnesium dihalide compound together with an acyl halide with(2) a mixture or addition-reaction product of a tetravalent titanium compound containing at least one halogen atom with at least one electron donor compound selected from the group consisting of organic compounds containing a P--O bond, organic compounds containing an Si--O bond, ether compounds, nitrite ester compounds, sulfite ester compounds, alcohol compounds, phenol compounds and naphthol compounds,(B) a trialkyl aluminum compound, and (C) a carboxylic acid ester compound.

Abstract: A catalyst for polymerizing .alpha.-olefins composed of a titanium composition formed by heating a co-comminuted mixture of a magnesium halide and a complex of an aluminum halide and a carboxylic acid ester of the formula R.sup.1 COOR.sup.2, with titanium tetra-chloride; and an organic aluminum compound of the formula AlR.sup.3 mH.sup.3 --m; and optionally added thereto at least one component selected from an alkyl aluminum halide of the formula AlR.sup.4 nX.sub.3 --n; a carboxylic acid ester of the formula R.sup.5 COOR.sup.6 ; and its complex formed with an aluminum halide; is disclosed.

Abstract: A random copolymer consisting essentially of 40 to 90 mole% of propylene and 60 to 10 mole% of 1-butene, and having (A) a boiling n-heptane-insoluble content of not more than 5% by weight based on the weight of the copolymer, (B) a boiling methyl acetate-soluble content of not more than 2% by weight based on the weight of the copolymer, (C) a melting point, determined by differential thermal analysis, of 40 to 140.degree. C., (D) an intrinsic viscosity, determined in decalin at 135.degree. C., of 0.5 to 6 dl/g, (E) an elongation at break, measured by JIS K6301, of at least 300%, (F) a tensile strength at break, measured by JIS K6301, of at least 50 kg/cm.sup.2, and (G) a haze, measured by JIS K6714, of not more than 40%.

Abstract: Gas-phase polymerization of an .alpha.-olefin, especially propylene, in a stirred or fluidized bed of substantially uniform and approximately spherical carrier particles of an .alpha.-olefin polymer of diameter 100-500 .mu.m, using a catalyst comprising an organo-metallic compound and a solid transition metal compound which has a particle size of less than 5 .mu.m, produces a propylene polymer having unexpectedly good powder flow characteristics. The transition metal compound is conveniently a titanium trichloride-containing material which has been treated with a dialkyl ether solution.

Abstract: Polymerization of ethylene or .alpha.-olefins is carried out with use of a catalyst comprising a modified titanium component obtained by pulverizing the starting titanium component of Ziegler solid catalysts and subjecting the resultant to a modification treatment through contact with an inert organic solvent or a mixture thereof with a modifier, and an organoaluminum component.The pulverized product of the starting titanium component is pulverized together with an organoaluminum compound and a small amount of ethylene or .alpha.-olefins thereby controlling the particle size distribution.

Abstract: A process for preparing highly stereoregular polyolefins in the presence of a catalyst comprising (A) a titanium-containing solid catalyst component composed of an organic complex derived from(i) a magnesium halide(ii) an organopolysiloxane selected from the group consisting of compounds of the formulaQ(Q.sub.2 SiO).sub.n SiQ.sub.3, (Q.sub.2 SiO).sub.n and X(Q.sub.2 SiO).sub.n SiQ.sub.2 X,(iii) an organic carboxylic acid ester, and(iv) a titanium compound of the formulaTi(OR).sub.l X.sub.4-l, and(B) an organoaluminum catalyst component of the formulaR'mAl(OR').sub.3-m,said organic complex being derived by bringing the component (i) into contact with a combination of the components (ii) and (iii) or a combination of the components (ii), (iii) and (iv) under mechanical pulverisation conditions and then treating the resulting pulverized composition with the component (iv) in the absence of mechanical pulverization.

Abstract: There is disclosed a process for the stereoregular polymerization of alpha olefins or mixtures thereof with ethylene, conducted in the presence of highly active and stereospecific new catalysts. The catalysts are obtained from the reaction of a particular Al-alkyl compound which is at least in part in the form of a complex and/or a substitution reaction product with an ester of an oxygenated organic or inorganic acid, with a supported component characterized by having surface area exceeding certain values or by showing a particular X-rays spectrum, and obtained by contacting a Ti halogenated compound, preferably in the form of a complex with an electron-donor compound, with a support comprising a Mg or Mn bihalide.In the catalysts the ratio between the Ti compound, expressed in Ti g-atoms, and the g moles of the ester and the electron-donor compound, when present, is lower than 0.3.

Abstract: A process for polymerizing or copolymerizing .alpha.-olefins in the presence of a catalyst composed of (A) a mechanically pulverized solid titanium-containing catalyst component and (B) an organometallic compound of a metal of Groups I to III of the periodic table, wherein said titanium-containing component is a solid halogen-containing titanium catalyst component obtained by reacting a mechanically copulverized solid product in the absence of mechanical pulverization with a titanium compound which is liquid under the reaction conditions, said mechanically copulverized product being derived from (1) a magnesium compound, (2) an organic acid ester, and (3) an active hydrogen-containing compound selected from the group of alcohols and phenols; and a catalyst composition used therefor.

Abstract: Method for the polymerization of alpha-olefins, e.g., ethylene and its higher homologs, to produce high molecular weight polymers by contacting the alpha-olefin or an alpha-olefin mixture to be polymerized with a catalyst formed from a mixture of a first and second component, the first component essentially consisting of a dialkyl, diaryl organoaluminum compound, or aluminum hydride, and preferably a dialkyl aluminum halide, e.g., diethyl aluminum chloride, and the second component essentially consisting of a salt, freshly precipitated oxide or hydroxide of a Group IVB, VB, VIB or VIII of the Periodic System, and most preferably a salt, such as titanium chloride.

Abstract: A titanium trihalide is ground with an organic Lewis Base compound which contains at least one phosphorus atom, and optionally at least one nitrogen atom, and a titanium tetrahalide, the Lewis Base and the titanium tetrahalide being used in amounts of 5 to 75, preferably 5 to 50%, molar and 1 to 50, preferably 5 to 30% molar respectively relative to the titanium trihalide. The materials are conveniently milled together and the milled product can be used as a component of an olefine polymerization catalyst and when such catalysts are used to polymerize propylene a high activity is achieved together with satisfactory stereospecificity.

Abstract: There are disclosed new starting components for use in preparing catalysts for the polymerization and copolymerization of olefins. The new starting components are compounds having the general formulae R.sub.2 AlOR" and/or RAl (OR").sub.

Abstract: There is disclosed a process for the stereoregular polymerization of alpha-olefins or mixtures thereof with ethylene, conducted in the presence of highly active and stereospecific new catalysts. The catalysts are obtained from the reaction of a particular Al-alkyl compound which is at least in part in the form of a complex and/or a substitution reaction product with an ester of an oxygenated organic or inorganic acid, with a supported component characterized by having surface area exceeding certain values or showing a particular X-rays spectrum, and obtained by contacting a Ti halogenated compound, preferably in the form of a complex with an electron-donor compound, with a support comprising a Mg or Mn bihalide.In the catalysts the ratio between the Ti compound, expressed in Ti g-atoms, and the g moles of the ester and the electron-donor compound, when present, is lower than 0.3.

Abstract: There is disclosed a process for the stereoregular polymerization of alpha olefins or mixtures thereof with ethylene conducted in the presence of highly active and stereospecific new catalysts.The catalysts are obtained from the reaction of a component (A) which is a particular Al-alkyl compound that is at least in part in the form of an addition and/or a substitution reaction product with an electron-donor compound free from ester groups of oxygenated organic and inorganic acids, with a component (B) which is a supported component characterized by having surface area exceeding certain values or by showing a particular X-rays spectrum, and prepared by contacting a halogenated Ti compound, preferably in the form of a complex with an electron-donor compound, with a support comprising a Mg or Mn dihalide in an active state.In the catalysts the ratio between the Ti compound expressed in Ti g-atoms and the g-moles of the electron-donor compounds is lower than 0.3.

Abstract: Alpha-olefins C.sub.3 -C.sub.6 are polymerized stereospecifically with the aid of catalysts obtained by mixing(a) a catalyst-forming component which is an addition and/or substitution product of an electron-donor compound (or a Lewis base) with an aluminum trialkyl, or an addition product of an electron-donor compound with an alkyl aluminum compound containing two or more Al - atoms bound to each other through an oxygen or nitrogen atom with(b) a supported catalyst-forming component which is the product obtained by contacting a titanium compound, preferably in the form of an addition product with an electron donor, with a carrier which is a mixture of an active anhydrous Mg or Mn dihalide and a solid organic material which is inert to all other components of the catalyst including the Mg or Mn dihalide carrier.

Abstract: Aliphatic monoolefins are polymerized employing a catalyst consisting of a first component formed by co-comminuting a mixture of a halogenated titanium compound, a magnesium or manganese dihalide, a Lewis base, and an aromatic compound which is normally liquid at about 25.degree. C; a second component consisting of a trialkylaluminum compound and a Lewis base; and, optionally, third component which is a dialkylaluminum halide.

Abstract: Ethylene is polymerized or copolymerized with an .alpha.-olefin in the presence of a catalyst consisting of(A) a co-comminuted composition of:(a) a titanium compound;(b) a magnesium halide; and(c) a siloxane polymer; and(B) an organoaluminum compound.

Abstract: A method of preparing reformed titanium trichloride catalyst for .alpha.-olefin polymerization which comprises simultaneously pulverizing an organoaluminum compound and a crystalline titanium trichloride compound, the latter comprising titanium trichloride and aluminum trichloride, subsequently treating the pulverized mixture with a solvent selected from oxygen-containing organic compounds, and finally treating the thus treated titanium trichloride with a halide of a metal selected from the groups IV and V of the periodic table.

Abstract: A process for the production of olefin polymers which comprises contacting at least one olefin monomer with an olefin polymerization catalyst comprising:(1) a solid compound of titanium, vanadium or zirconium wherein the metal has a valency below its maximum,(2) a Grignard reagent which is substantially ether free,Mg[Al(C.sub.2 H.sub.5).sub.4 ].sub.2, Mg(C.sub.6 H.sub.5).sub.2,a lithium aluminium tetraalkyl, an aluminium hydrocarbyl halide, an aluminium hydrocarbyl sulphate, an aluminium hydrocarbyl oxyhydrocarbyl, an aluminium trihydrocarbyl or a dihydrocarbyl aluminium hydride, the improvement of adding to the polymerization system up to C.sub.a /f molecular proportions of a trivalent phosphorus compound of the formulaPR'.sub.3-n (X--A--Y).sub.nwhereinR' is halogen, a hydrocarbyl group, the group --NR.sub.2 or the group --OR;x is --O--, --S-- or --NR--;A is a bivalent hydrocarbyl radical such that X and Y are separated by not more than 3 carbon atoms;Y is --OR, --SR, --NR.sub.2, --PR.sub.

Abstract: According to the present invention, there is provided a process for preparing polyolefins by polymerizing or copolymerizing olefins in the presence of a catalyst consisting of a solid component and an organometallic compound component, characterized in that said solid component is obtained by copulverizing(1) a magnesium halide and/or a manganese halide,(2) an aromatic hydrocarbon,(3) a tetravalent titanium compound, and(4) a trivalent titanium compoundAnd in that said organometallic compound component is a mixture of(5) a trialkylaluminum and(6) a compound represented by the general formula AlR.sub.n X.sub.3-n wherein R is alkyl having 1 to 10 carbon atoms and may be the same or different, X is halogen and O<n<3.