Abstract: The present invention relates to spherical solid catalyst components for the polymerization of olefins, comprising a titanium compound, supported on a magnesium halide, containing more than one Ti-halogen link and optionally containing groups different from halogen in an amount lower than 0.5 mole per mole of Ti. Spherical solid compounds of the invention are characterized by having a surface area, measured by the BET method, of lower than 70 m2/g, a total porosity, measured by the mercurium method, higher than 0.5 cm3/g and a pore radius such that at least 50% have values higher than 800 Å.

Abstract: The present invention relates to catalysts for the polymerization of ethylene and its mixtures with olefins CH2═CHRVIII, comprising the reaction product of a solid catalyst component containing Ti, Mg and halogen, an alkyl-Al compound and a particular electron donor compound selected from the compounds containing at least two oxygen atoms bonded to different carbon atoms and selected by standard tests of reactivity with triethyl-Al and MgCl2 compounds. The catalyst of the invention are used in processes for the (co)polymerization of ethylene to prepare (co)polymers having narrow molecular weight distribution (MWD).

Abstract: The present invention relates to spherical solid catalyst components for the polymerization of olefins, comprising a titanium compound, supported on a magnesium halide, containing more than one Ti-halogen link and optionally containing groups different from halogen in an amount lower than 0.5 mole per mole of Ti.

Abstract: The present invention relates to spherical solid components of catalysts for the polymerization of olefins comprising, supported on a magnesium dihalide in active form, a titanium compound containing at least one Ti-halogen bond and one OR group, said OR group being bonded to Ti in an amount such that the OR/Ti molar ratio is greater than or equal to 0.5; optionally the component also comprises an electron donor compound. The spherical solid components of the invention are characterized by having a porosity comprised between 0.35 and 0.7 cm.sup.3 /g and by a pore size distribution such that at least 50% of the porosity is due to pores having an average radius greater than 800 .ANG..

Abstract: The present invention relates to spherical solid components of catalysts for the polymerization of olefins comprising, supported on a magnesium dihalide in active form, a titanium compound containing at least one Ti-halogen bond and one OR group, said OR group being bonded to Ti in an amount such that the OR/Ti molar ratio is greater than or equal to 0.5; optionally the component also comprises an electron donor compound. The spherical solid components of the invention are characterized by having a porosity comprised between 0.35 and 0.7 cm.sup.3 /g and by a pore size distribution such that at least 50% of the porosity is due to pores having an average radius greater than 800 .ANG..

Abstract: The present invention relates to spherical solid components of catalysts for the polymerization of olefins comprising, supported on a magnesium dihalide in active form, a titanium compound containing at least one Ti-halogen bond, and optionally an electron donor compound. The spherical solid components of the invention are characterized by porosity values higher than 1 cm.sup.3 /g and a pore size distribution such that at least 30% of their pores have an average radius greater than 10000 .ANG..

Abstract: Solid catalyst component for the polymerization of ethylene including the product of the reaction between:1) the product obtained by reacting:1A) a halide, halogen alcoholate or alcoholate of titanium, vanadium or zirconium;1B) a small quantity of water, and optionally1C) a compound or composition capable of substituting, in compound 1A, one or more alkoxy groups with a halogen atom; and2) a complex having general formula:MgX.sub.2 .multidot.nAlRX.sub.2 .multidot.pAlX.sub.3where X is chlorine or bromine; R is a hydrocarbon radical containing from 1 to 20 carbon atoms; n is a number from 1 to 4; p is a number from 0 to 1, and n+p from 1 to 4;the catalyst component being in the form or particles having a diameter lower than or equal to 20 micrometers, and an average diameter lower than or equal to 10 micrometers.

Abstract: Solid catalyst components for the preparation of catalysts capable of producing polymers and copolymers of ethylene with ultra high molecular weight are obtained in the form of particles having an average diameter of less than 10 micrometers, by way of reaction, in the presence of H.sub.2 O, between:1) a liquid obtained by reacting:A) a titanium compound containing at least one Ti--OR bond, where R is a C.sub.1 -C.sub.20 alkyl, C.sub.3 -C.sub.20 cycloalkyl, or C.sub.6 -C.sub.20 aryl radical; withB) a magnesium compound selected from the group consisting of: halides; compounds comprising at least one --OR or--OCOR group bonded to the magnesium, where R is a C.sub.1 -C.sub.20 alkyl, C.sub.3 -C.sub.20 cycloalkyl, or C.sub.6 -C.sub.20 aryl radical; organometallic compounds; products of the reaction between the above mentioned compounds and electron-donor compounds; and2) a compound or composition capable of halogenating and optionally reducing (A).

Abstract: Catalytic components for copolymerizing ethylene with alpha-olefins, or alpha-olefins with one another, and possibly with a diene as a termonomer, suitable for producing saturated and unsaturated elastomeric copolymers are disclosed. The catalytic components are compounds obtained by the reaction of:(1) a magnesium compound having the formula:R'.sub.y MgX.sub.n (OR).sub.2-n(wherein R, R'=alkyl, cycloalkyl, aryl; X=Cl, Br; n is from 0 to 1.8, y is from 0 to 1, and n+y=2), or(2) a Mg-alcohol adduct;with a titanium compound having the formula:Ti(OR).sub.Z X.sub.4-Z'wherein X and R are as defined above and Z is from 0 to 1, the compounds being charcterized by a Mg/Ti ratio of from 0.5 to 50 and an OR/Ti ratio of from 0.7 to 10. The copolymers produced using these catalytic components are endowed with improved tension-set characteristics in the vulcanized state.

Abstract: Crystalline copolymers of ethylene and alpha-olefins CH.sub.2 .dbd.CHR in which R is an alkyl group having 2 to 8 carbon atoms, containing 0.5 to 3% by moles of polymerized alpha-olefin and having a density lower than 0.945 g/cc are obtained by polymerizing, in the gas phase, mixtures of ethylene and the alpha-olefins in contact with catalysts prepared from (1) Ti compounds supported on Mg halides and (2) organometallic compounds, which are active in the polymerization of ethylene but exhibit little, if any, activity in the homo- or copolymerization of the alpha-olefins.

Abstract: Catalysts for the preparation of copolymers of ethylene and/or alpha-olefins and optionally dienes, are obtained by reacting an Al-alkyl with a solid catalytic component comprising:(A) a magnesium compound containing at least an Mg-halogen bond;(B) a halogenated compound of at least partly trivalent Ti or V, containing at least a Ti-OR or V-OR bond, wherein the Mg/Ti(V), halogen/Ti(V), halogen/Mg and OR/Ti(V) atomic ratios are within determined ranges; and(C) an electron-donor compound.Elastomeric copolymers endowed with improved tension set values are obtained with said catalysts.

Abstract: Disclosed are catalysts for the polymerization of ethylene and of mixtures thereof with olefins, comprising the product obtained by reacting the following components:(a) an Al-alkyl compound;(b) an electron-donor compound containing at least a nitrogen atom, said compound being reactive towards MgCl.sub.2, but not towards Al-triethyl; and(c) the reaction product between a titanium compound containing at least a titanium-halogen bond and an anhydrous magnesium halide.The obtained (co)polymers have a very narrow molecular weight distribution which renders them particularly suitable for some applications, such as injection molding.

Abstract: Components of catalysts for the polymerization of ethylene and of mixtures thereof with other olefins, in the form of emulsions or dispersions, in an inert liquid medium or in an inert gas phase of a liquid phase, comprising a compound of a metal of Groups IV to VI inclusive, of the Mendelyeev Periodic System, or a composition containing such a compound of the Mendelyeev Periodic System, which compound or composition is immiscible with aliphatic hydrocarbons, or which components are obtained from emulsions or dispersions, in an inert liquid medium or in gas phase, of a precursor of the catalyst component which, in the liquid state, is immiscible with the aliphatic hydrocarbons.An object of this invention is to provide new catalyst components for use in the polymerization of ethylene and of mixtures thereof with olefins and the catalysts obtained therefrom.

Abstract: New olefin polymerization catalysts are disclosed which are prepared by mixing(A) the product obtained by contacting(1) a halogen-containing, or a halogen free, oxygen-containing organic compound of Ti, V or Zr, with(2) a hydrocarbon-insoluble solid product containing at least metal M and halogen and resulting from decomposition of a complex having the formulaMX.sub.2.nAlRX.sub.2.pAlX.sub.3(I)to M dihalide, or to a product containing M dihalide. In formula (I):M is Mg, Mn or Ca;X is chlorine or bromine in the case of MX.sub.2 and AlX.sub.3, and chlorine, bromine or alkoxy group in the case of AlRX.sub.2 ;R is a hydrocarbon radical containing from 1 to 20 carbon atoms;n is a number from 1 to 4, inclusive;p is a number from 0 to 1, inclusive;1.ltoreq.n+p.ltoreq.4; with(B) an organometallic compound of a metal belonging to Groups I-III of the Mendelyeev Periodic Table.In the decomposition product of formula (I) M in the M dihalide has the same significance as M in formula (I).

Abstract: There are disclosed components of catalysts for polymerizing ethylene and mixtures of ethylene with alpha-olefins comprising the reaction product of (A) a magnesium compound, such as Mg-chloride, Mg-alcoholate or a Grignard compound, with (B) a titanium, vanadium or zirconium compound having at least two metal-oxygen bonds, such as a tetra-alcoholate, and with (C) a halogenated compound of metals of B, such as Ti tetrachloride.According to an aspect of the invention, the reaction product (A)+(B), before being reacted with (C), is treated with a silicum compound having a halogenating and/or reducing action.The catalysts according to the invention are suitable for obtaining ethylene polymers having a broad distribution of molecular weights.

Abstract: There are disclosed new catalyst-forming components and catalysts prepared therefrom which, used in the polymerization of olefins, result in high yields of polyolefins having a narrow molecular weight distribution and which do not require special purifying after-treatments for the removal of catalyst residues. More particularly, the new catalyst components and catalysts prepared from them are useful in the polymerization of ethylene or alpha-olefins CH.sub.2 .dbd.CHR, in which R is an alkyl or aryl radical of from 1 to 8 carbon atoms, or mixtures of ethylene with said alpha-olefins.

Abstract: There are disclosed catalyst components for polymerizing olefins, consisting of the product obtained by successively reacting(A) a Mg compound (halide, alcoholate, haloalcoholate, carboxylate, oxyde, hydroxyde, salt of an inorganic oxygen containing acid, Grignard reagent or reaction product of a Grignard reagent with a silicon compound), optionally in the form of a complex with an electron-donor compound, with(B) a compound having general formula [MO.sub.x (OR).sub.y ].sub.n, wherein M=Ti, V or Zr, R=an alkyl, an aryl or a cycloalkyl containing 1 to 20 carbon atoms, x may be zero, y is an integer not lower than 2, 2x+y=a valence of M, and n=an integer from 1 to 6 (inclusive), and with(C) a compound, other than the aluminium halides, exerting on component (B) a halogenating action and a reducing action, or a mixture of a halogenating compound with a reducing substance.

Abstract: New olefin polymerization catalysts are disclosed which are prepared by mixing(A) the product obtained by contacting(1) a halogen-containing, or a halogen free, oxygen-containing organic compound of Ti, V or Zr, with(2) a hydrocarbon-insoluble solid product containing at least metal M and halogen and resulting from decomposition of a complex having the formula (I) MX.sub.2.nAlRX.sub.2.pAlX.sub.3 to M dihalide, or to a product containing M dihalide.In formula (I):M is Ba, Ca, Mg or Mn;X is chlorine or bromine in the case of MX.sub.2 and AlX.sub.3, and chlorine, bromine or alkoxy group in the case of AlRX.sub.2 ;R is a hydrocarbon radical containing from 1 to 20 carbon atoms;n is a number from 1 to 4, inclusive;p is a number from 0 to 1, inclusive;1.ltoreq.n + p.ltoreq.4; with(B) an organometallic compound of a metal belonging to Groups I-III of the Mendelyeev Periodic Table,In the decomposition product of formula (I) M in the M dihalide has the same significance as M in formula (I).