Abstract: An activated preformed catalytic system for the 1,4-cis stereospecific polymerization of conjugated dienes based on at least: one or more preformation conjugated diene monomers, one or more salts of one or more rare-earth metals of one or more acids chosen from an organic phosphoric acid and an organic carboxylic acid, and a mixture thereof, one or more alkylating agents consisting of one or more alkylaluminiums of formula AlR3 or HAlR2, in which R represents an alkyl radical and H represents a hydrogen atom, one or more halogen donors consisting of an alkylaluminium halide, and one or more compounds corresponding to formula (I) below:

Abstract: The present disclosure provides a catalyst composition for ethylene oligomerization including an imino ferrous complex shown in Formula (I) as the main catalyst, an aluminum-containing cocatalyst, water, and an organic solvent: According to the present disclosure, a higher oligomerization activity can be obtained with the catalyst composition than with a catalyst composition system in the prior art which contains no water. Moreover, when the catalyst composition according to the present disclosure is used, a high selectivity of ?-olefins is obtainable. Besides, the catalyst composition according to the present disclosure can enable rapid initiation, stable operation, and good repeatability of the oligomerization reaction. According to the present disclosure, a high oligomerization activity can be obtained even at a rather low ratio of Al/Fe, or at a low reaction temperature.

Abstract: The present invention provides dual catalyst systems and polymerization processes employing these dual catalyst systems. The disclosed polymerization processes can produce olefin polymers at higher production rates, and these olefin polymers may have a higher molecular weight and/or a lower melt index.

Abstract: The invention is directed to a metallocene catalyst system and a process for preparing the system. The metallocene catalyst system comprises a support and metallocene bound substantially throughout the support. The selection of certain supports facilitates the production of metallocene catalyst systems having increased catalytic activity than previously recognized.

Abstract: The invention is directed to a metallocene catalyst system comprising an inert silica support having pores with a peak pore volume of greater than about 0.115 mL/g at a pore diameter between about 250 Angstroms and about 350 Angstroms, and an alumoxane activator, with the metallocene being bound substantially throughout the support. The activator is grafted to the support in a solvent at a reflux temperature of toluene to obtain an aluminoxane on silica, and a metallocene component is added to make a MCS having a metallocene loading of about 2 wt %. This facilitates the production of metallocene catalyst systems having increased catalytic activity than previously recognized that is at least about 20 percent higher than the catalytic activity for a metallocene loading of about 1 wt % where the activator is grafted to the support at room temperature.

Abstract: A continuity additive according to one general approach includes a substance having an ability to reduce, prevent, or mitigate at least one of fouling, sheeting, and static level of a material present in a polymerization reactor system when added to the reactor system in an effective amount, with the proviso that the substance is not a polysulfone polymer, a polymeric polyamine, or an oil-soluble sulfonic acid; and a scavenger contacted with the substance, optionally, the scavenger neutralizing water coming in contact therewith. Additional continuity additives, methods of making continuity additives, and use of continuity additives are also presented.

Abstract: Catalyst compositions for the polymerization of olefins having improved flowability properties are provided.

Abstract: Cycloolefin copolymers which are distinguished by the presence of racemic diads of repeating polycyclic units and additionally by racemic triads of repeating polycyclic units are described. These copolymers can be prepared by copolymerization of polycyclic olefins with linear olefins in the presence of metallocene catalysts which have no Cs symmetry in relation to the centroid-M-centroid plane. The novel copolymers can be used for the production of shaped articles, in particular of films.

Abstract: The present invention relates to an ultrahigh-molecular-weight ethylene copolymer powder having an intrinsic viscosity (?) of 10 dl/g to 34 dl/g, obtainable by copolymerizing ethylene and at least one olefin selected from the group consisting of ?-olefins having 3 to 20 carbon atoms, cyclic olefins having 3 to 20 carbon atoms, compounds represented by the formula CH2?CHR1 wherein R1 is an aryl group having 6 to 20 carbon atoms, and linear, branched or cyclic dienes having 4 to 20 carbon atoms, wherein (1) a molded article of the copolymer powder has a haze of from 30% to 80% and (2) the copolymer powder has a bulk density of from 0.35 g/cm3 to 0.6 g/cm3.

Abstract: The present techniques relate to catalyst compositions, methods, and polymers encompassing a Group 4 metallocene compound comprising bridging ?5-cyclopentadienyl-type ligands, typically in combination with a cocatalyst, and a activator. The compositions and methods presented herein include ethylene polymers with low melt elasticity.

Abstract: Cycloolefin copolymers which are distinguished by the presence of racemic diads of repeating polycyclic units and additionally by racemic triads of repeating polycyclic units are described. These copolymers can be prepared by copolymerization of polycyclic olefins with linear olefins in the presence of metallocene catalysts which have no Cs symmetry in relation to the centroid-M-centroid plane. The novel copolymers can be used for the production of shaped articles, in particular of films.

Abstract: The present invention provides a polymerization process which is conducted by contacting an olefin monomer and at least one olefin comonomer in the presence of hydrogen and a metallocene-based catalyst composition. Polymers produced from the polymerization process are also provided, and these polymers have a reverse comonomer distribution, low levels of long chain branches, and a ratio of Mw/Mn from about 3 to about 6.

Abstract: The present techniques relate to catalyst compositions, methods, and polymers encompassing a Group 4 metallocene compound comprising bridged ?5-cyclopentadienyl-type ligands, typically in combination with a cocatalyst, and an activator. The bridged ?5-cyclopentadienyl-type ligands are connected by a cyclic substituent.

Abstract: Film formed from a polyethylene resin composition which obeys a dynamic rheological relationship at 190° C. between melt storage modulus G?, measured in Pa and at a dynamic frequency where the loss modulus G?=3000 Pa, and dynamic complex viscosity ?*100, measured in Pa·s at 100 rad/s, such that (a) G?(G?=3000)>?0.86?*100+z where z=3800, and at the same time (b) G?(G?=3000)>0.875?*100?y where y=650, and having an impact strength (DDT) of at least 250 g, measured on 15 ?m thick film (blown under conditions with BUR=5:1 and Neck Height=8×D) conditioned for 48 hours at 20°-25° C., according to ASTM D1709.

Abstract: A catalyst composition comprising a zirconium complex of a polyvalent aryloxyether and an alumoxane, polymerization processes employing the same, especially the continuous, solution polymerization of ethylene and one or more C3-30 olefins or diolefins to prepare copolymers having reduced cocatalyst by-product content, are disclosed.

Abstract: Alkylidene complexes of ruthenium containing N-heterocyclic carbene ligands and their use as highly active, selective catalysts for olefin metathesis The invention relates to a complex of ruthenium of the structural formula I, where X1 and X2 are identical or different and are each an anionic ligand, R1 and R2 are identical or different and can also contain a ring, and R1 and R2 are each hydrogen or/and a hydrocarbon group, the ligand L1 is an N-heterocyclic carbene and the ligand L2 is an uncharged electron donor, in particular an N-heterocyclic carbene or an amine, imine, phosphine, phosphite, stibine, arsine, carbonyl compound, carboxyl compound, nitrile, alcohol, ether, thiol or thioether, where R1, R2, R3 and R4 are hydrogen or/and hydrocarbon groups.

Abstract: A catalyst for polymerizing vinyl compounds or ?-olefins according to the present invention includes (A) a transition metal complex, (B) a clay, clay mineral or ion-exchangeable layered compound, modified with at least one organic compound selected from the group consisting of quaternary ammonium salts, amine compounds, and adducts of amine and Brönsted acid, and (C) at least one aluminoxy compound. The transition metal in (A) is selected from Groups 4 to 10 or Groups 8 to 10 of the Periodic Table for catalysts for vinyl compounds or ?-olefins, respectively. The aluminoxy compound is represented by the general Formula wherein a plurality of R groups are each independently C1-10 hydrocarbon group and at least one of the R groups is a hydrocarbon group having 2 or more carbon atoms; and z is an integer of 2 or more for catalyst for vinyl compounds and 2 to 4 for catalysts for ?-olefins.

Abstract: A metal compound obtained by a process comprising the step of contacting, in a specific ratio, a compound represented by the formula M1L1r, a compound represented by the formula R1s?1TH, and a compound represented by the formula R24?nJ(OH)n; a catalyst component for addition polymerization comprising the metal compound; a catalyst for addition polymerization using the catalyst component; and a process for producing an addition polymer using the catalyst.

Abstract: The invention relates to chemical products which are suited for use as co-catalysts and which can be obtained by reacting a compound of formula (I), M1R1R2(R3)m with a compound of formula (II), (R4X)q-(G)*(M2R5R6)g. In formula (I), R1, R2 and R3 are the same or different and represent a hydrogen atom, C1–C20 alkyl, C1–C20 alkyl halide, C6–C20 aryl, C6–C20 aryl halide, C7–C40 arylalkyl, C7–C40 arylalkyl halide, C7–C40 alkylaryl or C7–C40 alkylaryl halide; M1 represents an element of the second or third main group of the periodic table of elements, and; m equals 0 or 1, whereby m is equal to 1 when M1 represents an element of the third main group, and m is equal to 0 when M1 represents an element of the second main group.

Abstract: Catalyst precursor compounds having both (i) a polydentate ligand which comprises a cyclic moiety as well as a heteroatom and (ii) a protected hydride/hydrocarbyl ligand bonded to a metal atom, as well as olefin polymerization catalyst systems based thereupon, polymerization processes using such catalyst systems and polymers produced thereby.

Abstract: The catalyst for polymerizing vinyl compounds according to the present invention comprises (A) a complex of Group 4 to 10 transition metal of the Periodic Table, (B) a clay, clay mineral or ion-exchangeable layered compound, and (C) at least one aluminoxy compound represented by Formula (1): wherein a plurality of R groups are each independently C1-10 hydrocarbon group and at least one of the R groups is a hydrocarbon group having 2 or more carbon atoms; and x is an integer of 2 or more. By using the Group 4 to 10 transition metal complex and the clay, clay mineral or ion-exchangeable layered compound in combination with the specific aluminoxy compound, vinyl polymers are produced at a high efficiency.

Abstract: Activator solid support for metallocenes as catalysts in the polymerization of olefins, characterized in that it consists of a group of support particles for a solid catalytic component, which are formed from at least one porous mineral oxide, the said particles having been modified in order to carry, on the surface, aluminum and/or magnesium Lewis-acid sites of formula: groups coming from a functionalization agent having reacted with —OH radicals carried by the base particles of the support, the functionalization reaction having been followed by a fluorination reaction. The catalytic system according to the invention comprises (a) a metallocene catalyst, which has, if required, been subjected to a prealkylation treatment; (b) a cocatalyst; and (c) an activator solid support for metallocene, as defined above, it being possible for the cocatalyst (b) to be absent if the metallocene catalyst (a) has been prealkylated.

Abstract: There are disclosed: (i) a first solid catalyst component (A1) obtained by contacting (a) a carrier of carboxyl group-carrying polymer particles having an average particle size of from about 1 to 200 &mgr;m, (b) an organometallic compound of the number 1, 2 or 13 group of metals in the periodic table of elements, and (c) a transition metal compound of the number 4 group of metals of the periodic table of elements, and a second solid catalyst component (A2) obtained by contacting (a), (b), (c) and (d) a phenol compound, and production processes of the solid catalyst components (A1) and (A2), (ii) a catalyst obtained by combining the solid catalyst component (A1) or (A2) with an organoaluminum compound (B); and (iii) a process for producing an olefin polymer with a catalyst of the invention, wherein the polymer produced is extremely low in its content of lower molecular weight components and low crystallinity components, and superior in its powder properties.

Abstract: A catalyst component for olefin polymerization, which comprises an ion-exchange layered silicate having the following features 1 and 2: feature 1: in a pore size distribution curve calculated from desorption isotherm by nitrogen adsorption-desorption method, a pore diameter Dm showing a maximum peak intensity DVM is from 60 to 200 Å; and feature 2: in a pore size distribution curve calculated from desorption isotherm by nitrogen adsorption-desorption method, a pore diameter Dm1/2 (Å) on the smaller pore size side corresponding to a ½ peak intensity of the maximum peak intensity DVM has a relation of Dm1/2/Dm of at least 0.65 and less than 1, provided that the largest value is employed when there are a plurality of Dm1/2 values.

Abstract: A process for preparing polypropylene-b-poly(ethylene-co-propylene) by the use of a tubular continuous polymerizer in the presence of an olefin-polymerizing catalyst comprising a solid catalyst component (1) composed of titanium and halogen; an organosilicon compound (2); and, if necessary, at least one electron-donating compound (3) selected from the group consisting of organosilicon compounds represented by the general formula: RnSi(OR′)4−n (wherein R and R′ are each independently a C1-C10 hydrocarbon group; and n is an integer of 1 to 3) and nitrogenous heterocyclic compounds, wherein the solid catalyst component (1) is preliminarily brought into contact with the organosilicon compound (2) in the presence of the electron-donating compound (3), and then a polypropylene segment is formed through polymerization, followed by formation of a poly(ethylene-co-propylene) segment at the end of the polypropylene segment through polymerization.

Abstract: An olefin polymerization catalyst comprising the following components (A) and (B): Component (A): an ion-exchange layered silicate having an acid site of at most −8.2 pKa, the amount of the acid site is equivalent to at least 0.05 mmol/g of 2,6-dimethylpyridine consumed for neutralization; and Component (B): a compound of a transition metal belonging to Group 3 to Group 12 of the Periodic Table.

Abstract: A process for the production of an ionic transition metal catalyst in supported form than is highly productive under gas phase olefin polymerization conditions. In the process a an aluminum alkyl is added to a suitable solvent after which a neutral metallocene compound is added to the solution under stirring in a quantity that provides for a ratio of Al to transition metal of at least 25:1. To this metallocene-aluminum alkyl solution is next added an ionic compound the anionic portion of which is a non-coordinating anion under stirring until all materials are dissolve. The ionic compound is added in a quantity that provides for a ratio of NCA to transition metal of at least 1:1. Next the support particles are added to the solution and thereafter the solution is heated to at least 40° C. and held at this elevated temperature for at least 0.5 hour. Thereafter the solvent is removed and the supported catalyst is dried under vacuum.

Abstract: A process for the production of an ionic transition metal catalyst in supported form than is highly productive under gas phase olefin polymerization conditions. In the process a an aluminum alkyl is added to a suitable solvent after which a neutral metallocene compound is added to the solution under stirring in a quantity that provides for a ratio of Al to transition metal of at least 25:1. To this metallocene-aluminum alkyl solution is next added an ionic compound the anionic portion of which is a non-coordinating anion under stirring until all materials are dissolve. The ionic compound is added in a quantity that provides for a ratio of NCA to transition metal of at least 1:1. Next the support particles are added to the solution and thereafter the solution is heated to at least 40° C. and held at this elevated temperature for at least 0.5 hour. Thereafter the solvent is removed and the supported catalyst is dried under vacuum.

Abstract: The present invention relates to a catalyst composition and a method for making the catalyst composition of a polymerization catalyst and a carboxylate metal salt. The invention is also directed to the use of the catalyst composition in the polymerization of olefin(s). In particular, the polymerization catalyst system is supported on a carrier. More particularly, the polymerization catalyst comprises a bulky ligand metallocene-type catalyst system.

Abstract: The present invention relates to a catalyst composition and a method for making the catalyst composition of a polymerization catalyst and a carboxylate metal salt. The invention is also directed to the use of the catalyst composition in the polymerization of olefin(s). In particular, the polymerization catalyst system is supported on a carrier.

Abstract: Supported catalyst systems are obtainable by A) reaction of an inorganic carrier with a metal compound of the general formula I M1(R1)r(R2)s(R3)t(R4)u  I  where M1 is an alkali metal, an alkaline earth metal or a metal of main group III or IV of the Periodic Table, R1 is hydrogen, Ch1-C10-alkyl, C6-C15-aryl, alkylaryl or arylalkyl each having 1 to 10 carbon atoms in the alkyl radical and 6 to 20 carbon atoms in the aryl radical, R2 to R4 are each hydrogen, halogen, C1-C10-alkyl, C6-C15-aryl, alkylaryl, arylalkyl, alkoxy or dialkylamino each having 1 to 10 carbon atoms in the alkyl radical and 6 to 20 carbon atoms in the aryl radical, r is an integer from 1 to 4 and s, t and u are integers from 0 to 3 the sum r+s+t+u corresponding to the valency of M1, B) reaction of the material obtained according to A) with a metallocene complex in its metal dihalide form and a compound forming metallocenium ions and C) subsequent reaction with a metal compound of the general formula I

Abstract: Catalysts for olefin polymerization comprising (a) a compound of a transition metal of Groups 8 to 10 of the Periodic Table, (b) clay, a clay mineral or an ion-exchanging layered compound, (c) a silane compound, and optionally (d) an organic aluminium compound and/or (e) an alkylating agent, and those comprising (a) a compound of a transition metal of Groups 8 to 10 of the Periodic Table, (b) clay, a clay mineral or an ion-exchanging layered compound, (d) an organic aluminium compounds and optionally (e) an alkylating agent have high activity, though not containing a large amount of aluminoxane. Using the catalysts, high-quality olefin polymers with good morphology are produced efficiently. The amount of the residual metal to remain in the polymers produced is small.

Abstract: The present invention relates to a catalyst composition and a method for making the catalyst composition of a polymerization catalyst and a carboxylate metal salt. The invention is also directed to the use of the catalyst composition in the polymerization of olefin(s). In particular, the polymerization catalyst system is supported on a carrier.

Abstract: The present invention relates to a catalyst composition and a method for making the catalyst composition of a polymerization catalyst and a carboxylate metal salt. The invention is also directed to the use of the catalyst composition in the polymerization of olefin(s). In particular, the polymerization catalyst system is supported on a carrier. More particularly, the polymerization catalyst comprises a bulky ligand metallocene-type catalyst system.

Abstract: Branched polypropylene compositions which have improved melt strength and good processability are provided. The branched polypropylene compositions of the present invention have a polydispersity of less than 4.0 and a melt point greater than 90° C. Further, the weight average branching index g of the polypropylene compositions is less than 0.95. Additionally, a novel process is provided for efficiently producing a branched polypropylene composition comprising: a) contacting propylene monomers in a reactor with an inert hydrocarbon solvent or diluent and a catalyst composition comprising one or more single site catalyst compounds capable of producing stereospecific polypropylene at a temperature from about 40° C. to about 120° C., wherein the ratio in the reactor of the propylene monomers to the inert hydrocarbon solvent or diluent is less than 9.

Abstract: A process for preparation of polyolefins using an olefin polymerization catalyst comprising (A) a solid catalyst component and (B) an organometallic compound component. The solid catalyst component (A) is prepared by a process comprising the steps of: (I) obtaining a solid (A-1) by reacting: (i) an organomagnesium component soluble in a hydrocarbon solvent and represented by the formula (M1)&agr;(Mg)&bgr;(R1)p(R2)q(OR3)r; and (ii) an Si—H bond-containing chlorosilane compound represented by the formula: HaSiClbR44−(a+b), in a ratio of from 0.01 to 100 mol (ii) per mol (i); (II) reacting the solid (A-1) with an alcohol (A-2) in a ratio of from 0.05 to 20 mol of the alcohol per mol of C—Mg bonds contained in the solid (A-1), to form a reaction product; and (III) reacting the reaction product with a titanium compound (A-4). The solid catalyst component (A) is adjusted to have an alkoxy group/titanium molar ratio of 2.4 or lower and an alkoxy group/magnesium molar ratio of 0.

Abstract: A method for producing a stereospecific polyolefin in the presence of a catalyst comprising a transition metal compound and an organometallic compound, wherein a catalyst system is used which comprises: (A) a solid catalyst component prepared by reacting a homogeneous solution containing (i-1) magnesium and a hydroxylated organic compound, (i-2) an oxygen-containing organic compound of titanium and/or (i-3) an oxygen-containing organic compound of silicon and an oxygen-containing organic compound of aluminum and/or a boron compound, with (ii) at least one aluminum halide compound to obtain a solid product, and further reacting to this solid product (iii) an electron-donative compound, (iv) a titanium halide compound, and (v) ethylene and/or an .alpha.-olefin having at least 3 carbon atoms, (B) at least one member selected from the group consisting of organometallic compounds of Groups IA, IIA, IIB, IIIB and IVB of the Periodic Table, and (C) an electron-donative compound.

Abstract: Olefins are polymerized using, as a catalyst, a pi-olefin complex of a transition metal supported on aluminophosphate. The most effective complexes are cycloheptatrienyl-(1,3-cycloheptadiene)chromium(-1) compounds and alkyl-substituted derivatives thereof. A metal alkyl co-catalyst, such as triethylborane or triethylaluminum, can also be present. The catalyst is best suited for forming ethylene polymers and copolymers. Both the polymerization process using the described catalyst, and the catalyst system, per se, constitute different aspects of the invention.

Abstract: Olefin polymerization catalysts, processes for preparing the catalysts and processes for producing polyolefins utilizing the catalysts are provided. The catalysts are basically comprised of a pentadienyl derivative-transition metal complex adsorbed on an activated inorganic refractory compound.

Abstract: Preparation of polyethylene in the presence of selected nickel-containing catalysts.

Abstract: Copolymerization of ethylene and a C.sub.3 -C.sub.20 alpha-monoolefin at high temperature gives a low density polyethylene having a density of between 0.91 and 0.93 g/cc. The copolymerizations are accomplished with a catalyst made by co-comminuting an anhydrous magnesium halide, an anhydrous aluminum halide, a titanium compound, and at least one electron donor, and a cocatalyst comprising a synergistic mixture of an alkyl aluminum chloride and an oxygen-containing aluminum compound having oxygen attached to at least one aluminum valence.

Abstract: A catalyst component for olefin polymerization is a mixture of a transition metal composition with finely divided talc or a metal salt of an aromatic carboxylic acid. The talc or metal salt can be mixed with the transition metal composition during the production thereof or in a subsequent stage. Preferably an intimate mixture of the transition metal composition and the talc or metal salt is obtained, for example by grinding or by spray-drying. The catalyst component may be used to prepare an olefin polymer having improved properties.

Abstract: A catalyst component for olefin polymerization is a mixture of a transition metal composition with finely divided talc or a metal salt of an aromatic carboxylic acid. The talc or metal salt can be mixed with the transition metal composition during the production thereof or in a subsequent stage. Preferably an intimate mixture of the transition metal composition and the talc or metal salt is obtained, for example by grinding or by spraydrying. The catalyst component may be used to prepare an olefin polymer having improved properties.

Abstract: Polymeric transition metal oxide alkoxides are converted by reaction with a reducing metal having a higher oxidation potential then the transition metal to a catalyst precursor, activated with a halide to form a catalyst component for olefin polymerization. Particularly exemplified are the reaction products of partially hydrolyzed titanium alkoxides with Mg.degree., used as a catalyst component for slurry polymerizations to produce polyethylene resins.

Abstract: The present disclosure relates to a process for alternating copolymerization of propylene and butadiene in the absence of a polymerization solvent. The disclosure contains information relative to commercial production of the said copolymer and detailed teachings relative to the preparation of catalyst for use in the said process.

Abstract: Solid catalyst components produced by reacting an organomagnesium compound with an alkoxy compound of the formula,R.sup.1.sub.a Al(OR.sup.2).sub.b X.sub.cwherein R.sup.1 and R.sup.2 are each a hydrocarbon group having 1 to 20 carbon atoms, X is a halogen atom and a, b and c are numbers satisfying the equations at the same time,0.ltoreq.a<3, 0<b.ltoreq.3, 0.ltoreq.c<3, and a+b+c=3 and/or of the formula,R.sup.3.sub.d P(OR.sup.4).sub.e X.sub.fwherein R.sup.3 and R.sup.4 are each a hydrocarbon group having 1 to 20 carbon atoms, X is a halogen atom, and d, e and f are numbers satisfying the equations at the same time,0.ltoreq.d<3, 0<e.ltoreq.3, 0.ltoreq.f<3, and d+e+f=3to produce a solid product, and allowing the solid product to support a titanium compound and/or a vanadium compound, and a method for producing polyolefins which comprises polymerizing olefin in the presence of a catalyst system comprising said solid catalyst component and an organoaluminum compound.

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 solution polymerizing .alpha.-alkenes is disclosed, wherein the .alpha.-alkenes are polymerized at a temperature above 110.degree. C. in the presence of a catalyst which is dissolved in the reaction solvent. The catalyst is obtained by admixing a titanium compound, a magnesium compound which is not magnesiummono- or dihydrocarbyl, and an aluminum compound having the general formula AlR.sub.3-m X.sub.m, wherein R is the hydrocarbyl group, X is a halogen atom, and m is between 1 and 3.

Abstract: A process for the preparation of an extensively amorphous homo- or copolymer of an .alpha.-olefin of 3-32 carbon atoms comprises polymerizing an .alpha.-olefin using a titanium-containing Ziegler-Natta catalyst, the catalyst comprising a mixture of(A) the reaction product of(a) a .mu.-oxoalkoxide of the formulaTi.sub.x O.sub.(x+y-1) M.sub.y.sup.m (OR.sup.1).sub.(2x+1) Z.sub.(m-1)ywhereinM is a metal of valence m,R.sup.1 is an alkyl residue of 1-10 carbon atoms,Z is C.sub.1-18 alkanoyloxy or C.sub.1-10 alkoxy,x is a whole or fractional number of 1-4,y is a whole or fractional number of 1-2 andm is 2,3 or 4;with(b) a halogen-containing organoaluminum compound of the formulaR.sub.n.sup.2 AlX.sub.3-nwhereinR.sup.2 is C.sub.1-16 alkyl,X is chlorine, bromine or iodine, andn is a whole or fractional number of 0.5-2.5, and(B) an aluminum trialkyl of up to 16 carbon atoms in each alkyl group.

Abstract: A process for the preparation of catalysts of the polymerization of olefines, e.g. ethylene and propylene. This process comprises essentially the two following steps:(1) A compound (A) of an element selected from groups Ia, Ib, IIa, IIb, IIIa, IIIb, VIa and VIIb of the Periodic Table of Elements is heated and milled under the protection of an inert gas with an organic acetoxy compound; then the volatile portions of the mixture are eliminated by distillation.(2) The solid resulting from the first step is dissolved or dispersed in a non-polar hydrocarbon and an activator (B) is added, mixed and heated with said solution or dispersion until a homogeneous solution or dispersion of activated catalyst is obtained. (B) is selected from compounds of elements IVa, IVb and Vb of the Periodic Table. This catalyst is used in admixture with a polymerization promoter (C) selected from organo-metallic additives, e.g. aluminum-organic compounds for the polymerization of olefines at relatively low temperatures and pressures.