Abstract: Mixed catalyst compositions comprised of a first supported chromium-containing catalyst component and a second supported chromium-containing catalyst component and which additionally have one or more metallic or non-metallic catalytic agents associated therewith are provided. The additional metallic or non-metallic elements associated with the catalyst components can be aluminum, titanium, zirconium, boron, phosphorous or combinations thereof. The pore volume of the silica supports used for the first and second catalyst components differs by at least 0.3 cc/g. The mixed catalyst compositions of the invention are useful for the preparation of polyolefins. They are particularly useful of polymerization of ethylene in particle form polymerizations to produce high density polyethylene blow molding resins having good processability and physical properties. The improved particle form polymerization process and products obtained thereby using the above-described mixed catalyst compositions are also described.

Abstract: The present invention relates to a process for the polymerization of ethylene or copolymerization of ethylene and at least one other alpha-olefin, in the gas phase in a fluidized bed reactor, in the presence of a catalyst comprising chromium compounds associated with a granular support comprising a refractory oxide and activated by thermal treatment, which process is characterized in that the catalyst is used in the form of active particles of prepolymer, obtained by bringing the said catalyst in contact with ethylene, alone, or in a mixture with at least one higher alpha-olefin, in such a way that the prepolymer contains from 4.times.10.sup.-5 to 3 milligram atoms of chromium in the catalyst per gram.

Abstract: The present invention relates to a process for (co-)polymerizing ethylene in a gaseous phase, by means of a fluidized and/or mechanically stirred bed reactor, with the help of a catalyst comprising a chromium oxide and a titanium compound, supported on a refractory oxide and activated by a heat treatment. The process is characterized in that the catalyst is introduced into the reactor in the form of a dry powder consisting of particles free from prepolymer and the (co-)polymerization is carried out in the presence of an organoaluminium compound. The (co-)polymer thus obtained has substantially low catalyst residues, and an improved stress cracking resistance.

Abstract: A supported catalyst for polymerizing 1-olefins, for example, ethylene, is prepared by depositing a chromium compound and a titanium compound on a refractory oxide support which is substantially non-spherical, and which has a relatively broad particle size distribution range. The catalyst is preferably combined, either outside of the polymerization vessel or in situ, with a sufficient amount of at least one magnesium composition of the formula RMgR', where R and R' are the same or different and they are C.sub.1 to C.sub.12 hydrocarbyl groups, to provide a molar ratio of magnesium to chromium in the catalyst composition of about 0.01:1 to about 25:1. The resulting catalyst composition has good feedability and fluidization characteristics, and it produces resins of relatively high HLMI at relatively low temperatures.

Abstract: The present invention relates to a process for starting up the polymerization of ethylene or copolymerization of ethylene and at least one other alpha-olefin by bringing ethylene and optionally at least one other alpha-olefin in contact under fluidized-bed polymerization or copolymerization conditions and/or stirred mechanically, with a charge powder in the presence of a catalyst comprising a chromium oxide compound associated with a granular support and activated by thermal treatment, this catalyst being used in the form of a prepolymer, this process being characterized in that the charge powder employed is previously subjected to a treatment by contacting the said charge powder with an organo-aluminium compound, in such a way that the polymerization or copolymerization starts up immediately after the contacting of the ethylene and optionally one other alpha-olefin with the charge powder in the presence of the prepolymer.

Abstract: In one embodiment of this invention a surface silicated alumina composition, as opposed to conventional silica alumina, is provided. Such composition may also be fluorided and/or phosphated or phosphited. The resulting compositions are broadly useful but are of particular applicability as supports for chromium olefin polymerization catalysts. In another aspect alumina is fluorided and used with hexavalent chromium catalyst and a co-catalyst or in the alternative with an organochromium catalyst. If desired the support in this embodiment can also be phosphated or phosphited. In another embodiment, aluminum phosphate is formed in the pores of alumina. In contrast with alumina catalyst supports of the prior art, the supports of this invention allow for the production of olefin polymers at high rates of productivity. Also novel high density ultrahigh molecular weight polymers are produced.

Abstract: Fines are reduced in refractory materials by mixing the refractory material with an acid composition in a liquid polar organic compound and thereafter working the mixture until a decrease in volume occurs. The resulting product can be shaped and subjected to conventional finishing treatments. The resulting product exhibits reduced fines and thus is an improved material for use as a catalyst support. The resulting catalyst is of particular utility in the production of film grade ethylene polymer.

Abstract: A method of preparing ethylene polymers which comprises polymerizing ethylene, or ethylene and one or more .alpha.-olefins other than ethylene in the presence of a composite catalyst which catalyst comprises:(A) a solid composition prepared by depositing one or more chromium compounds and one or more metal compounds other than said chromium compounds onto an inorganic oxide support material and then calcining the resulting solid; and(B) one or more organometallic compounds that are each independently represented by the following general formula:MR.sup.1 aR.sup.2 bR.sup.3 cwherein M is a metal of Group I, II or III of the periodic table and the R.sup.1, R.sup.2 and R.sup.3 moieties are each independently hydrogen, a hydrocarbon radical of C.sub.1 -C.sub.14, or an alkoxy group of C.sub.1 -C.sub.

Abstract: An alumina-containing material is phosphated with mono- and dialkylphosphate esters. These partial phosphate esters are produced by a solvolysis reaction of a phosphorus compound and an alcohol. The phosphated alumina-containing material, when combined with a transition metal, such as chromium, can be used as a polymerization catalyst system to polymerize mono-1-olefins.

Abstract: Improved mixed chromium catalysts useful in particle form polymerizations to produce readily processable high density polyolefin resins which also have high resistance to environmental stress cracking are provided. First and second chromium-containing catalyst components obtained using silica supports of different pore volumes and wherein one of the catalyst components also contains aluminum are employed for the preparation of the mixed catalysts. The polymerization process and products obtained using the above-described mixed catalysts are also described.

Abstract: The present invention relates to a process for the polymerisation of ethylene or copolymerisation of ethylene and at least one other alpha-olefin, in the gas phase in a fluidised bed reactor, in the presence of a catalyst comprising chromium compounds associated with a granular support comprising a refractory oxide and activated by thermal treatment, which process is characterised in that the catalyst is used in the form of active particles of prepolymer, obtained by bringing the said catalyst in contact with ethylene, alone, or in a mixture with at least one higher alpha-olefin, in such a way that the prepolymer contains from 4.times.10.sup.-5 to 3 milligram atoms of chromium in the catalyst per gram.

Abstract: Process for polymerising ethylene, or copolymerising ethylene with an alpha-olefin, in the gas phase in the presence of a prepolymer/catalyst composition, the catalyst being an activated chromium oxide supported on a refractory oxide. The prepolymer is treated to an extraction with a solution comprising inert hydrocarbon and an organometallic compound, for example an alkylaluminum, prior to being dried and introduced into the gas phase (co) polymerisation. Prepolymer thus treated has improved properties in the dry state, for example improved flow.

Abstract: Ethene homopolymers and ethene copolymers with minor amounts of higher .alpha.-monoolefins are prepared by polymerization of the monomer or monomers using a chromium trioxide catalyst which is obtained by a method in which (1) a finely divided, porous, silicate carrier is laden with (2) chromium trioxide or a chromium compound which is converted to chromium trioxide under the conditions of stage (3), and then (3) the intermediate resulting from stage (2) is heated in an oxygen-containing gas stream. In this process, a cocatalyst which consists of a lithiumalkyl used in addition to the chromium trioxide catalyst.

Abstract: A catalyst system is produced by first forming a chromium catalyst on a predominantly silica support, activating in an oxygen-containing ambient and thereafter subjecting the thus activated composition to carbon monoxide reduction. The resulting reduced supported chromium catalyst composition is then precontacted with a cocatalyst selected from trialkyl boron compounds and dialkyl aluminum alkoxide compounds, preferably triethyl borane and thereafer contacted with ethylene. This results in a catalyst system which produces comonomer in situ so as to give tough, flexible ethylene copolymers from an essentially pure ethylene feed.

Abstract: Ethene polymerization by Phillips catalysis is carried out using (1) a supported catalyst, which is laden with chromium, phosphorus and aluminum, and (2) a cocatalyst, (1) being obtained by a method in which (1.1) a catalyst intermediate laden with chromium, phosphorus and aluminum is prepared from a silicate carrier, a selected chromium compound, a selected phosphorus compound and a selected aluminum compound, and then (1.2) the catalyst intermediate is heated in an oxygen-containing gas stream. In this process, the component (1) used is one which is obtained by a method in which, in each case in a specific manner, (1.1) in a first stage, (1.1.1) first a suspension is prepared from (1.1.1.1) a finely divided silicate carrier and (1.1.1.2) an inert organic solvent, (1.1.2) then, (1.1.2.1) in an inert organic solvent, (1.1.2.2) an organic chromium compound is combined with (1.1.2.3) an aluminum trialkyl, (1.1.3) then (1.1.3.1) the suspension resulting from (1.1.1) is combined with (1.1.3.

Abstract: Ethene polymers are prepared by Phillips catalysis using (1) a supported catalyst which is loaded with chromium and titanium and (2) a co-catalyst, (1) having been obtained by preparing (1.1) a chromium- and titanium-loaded catalyst intermediate from (1.1.a) a silicate carrier material, (1.1.b) a selected chromium compound and (1.1.c) a selected titanium compound and then (1.2) heating said catalyst intermediate in an oxygen-containing gas stream, the (1) used having been obtained by, in general terms, (1.1) preparing in the first stage (1.1.1) a suspension from (1.1.1.1) a finely divided silicate carrier material and (1.1.1.2) a liquid alkane, (1.1.2) then (1.1.2.1) combining the suspension resulting from (1.1.1.) with (1.1.2.2.) a finely divided chromium trioxide, (1.1.3) thereupon (1.1.3.1) combining the suspension obtained from (1.1.2) with (1.1.3.2) an alkanol, (1.1.4) thereafter (1.1.4.1) combining the suspension formed in (1.1.3) with (1.1.4.2) a titanium compound of the formula Ti(OR).sub.

Abstract: Ethane polymers are prepared by Phillips catalysis using (1) a supported catalyst which is laden with chromium, phosphorus and titanium and (2) a cocatalyst, (1) being obtained by a procedure in which (1.1) a catalyst intermediate laden with chromium, phosphorus and titanium is prepared from a silicate carrier, a selected chromium compound, a selected phosphorus compound and a selected titanium compound, and (1.2) the catalyst intermediate is then heated in an oxygen-containing gas stream. In the process, the supported catalyst (1) used is one which is obtained (using specific methods and substances in each case) by a procedure in which (1.1) in a first stage (1.1.1), a suspension is first prepared from (1.1.1.1) a finely divided silicate carrier and (1.1.1.2) an inert organic solvent, (1.1.2) a suspension is then prepared from (1.1.2.1) a finely divided chromium trioxide and (1.1.2.2) an inert organic solvent, (1.1.3) thereafter (1.1.3.1) the suspension resulting from (1.1.2) is combined with (1.1.3.

Abstract: Novel high pore volume, high purity alumina gels and catalysts prepared therefrom are provided by a unique alumina gel preparation comprising hydrolyzing an aluminum alcoholate in a medium of a mixture of water and acetone, aging the resultant product and thereafter washing with acetone. Processes for the polymerization of olefins utilizing the afore-described alumina gels are also included herein.

Abstract: A catalyst support based on aluminum polyphosphate or polyphosphoric acid-impregnated alumina is provided by two alternative techniques. In the first embodiment, an aluminum polyphosphate composition is heated in a dry atmosphere and thereafter impregnated with a zerovalent chromium component under anhydrous conditions. The resulting catalyst is active for olefin polymerization. In the second embodiment, alumina is impregnated with a polyphosphoric acid composition. This resulting polyphosphoric acid impregnated alumina can be used as a support for zerovalent chromium or can be impregnated with a chromium component and oxidized to give an active hexavalent chromium species. The resulting catalysts are advantageous because of their unusual sensitivity to hydrogen thus allowing great leeway in molecular weight control.

Abstract: Process for selective production of polyolefin resins of controlled rheology responsive to catalyst morphology in heat activated aluminum treated porous supports e.g., silica gel of regulated moisture content.

Abstract: A method for smoothly and reliably initiating polymerization of ethylene with a supported chromium oxide catalyst, with smaller amounts of catalyst and in substantially shorter periods of time then heretofore required, by adding an alkylaluminum compound and a hydroxyl-containing compound to the reactor of a polymerization reaction system prior to the commencement of polymerization and subjecting said alkylaluminum compound and hydroxyl-containing compound to suitable conditions of temperature and pressure for a time sufficient for said alkylaluminum compound to react completely with the moisture present in said reactor and said hydroxyl-containing compound.

Abstract: A catalyst support based on aluminum polyphosphate or polyphosphoric acid-impregnated alumina is provided by two alternative techniques. In the first embodiment, an aluminum polyphosphate composition is heated in a dry atmosphere and thereafter impregnated with a zerovalent chromium component under anhydrous conditions. The resulting catalyst is active for olefin polymerization. In the second embodiment, alumina is impregnated with a polyphosphoric acid composition. This resulting polyphosphoric acid impregnated alumina can be used as a support for zerovalent chromium or can be impregnated with a chromium component and oxidized to give an active hexavalent chromium species. The resulting catalysts are advantageous because of their unusual sensitivity to hydrogen thus allowing great leeway in molecular weight control.

Abstract: A process and catalyst for polymerizing olefins, especially ethylene or a mixture of ethylene with up to 40 wt % (based on total monomer) or other 1-olefinic monomer, the process comprising (a) supporting a chromium compound on a refractory oxide support material, (b) adding one or more tetravalent titanium compounds, (c) heating the product under such conditions that an active polymerization catalyst in the presence of one or more organometallic compounds wherein the metal is of groups 1A, 2A, 2B or 3A of the Periodic Table (Mendeleef), especially aluminium trialkyls. Step (d) is preferably carried out in the presence of a polyene modifier. The refractory oxide support material is preferably silica. The produced polyolefins are also claimed.

Abstract: In accordance with one embodiment of this invention, a chromium catalyst supported on an aluminum phosphate-containing base is used in conjunction with a boron component either as a part of the base or as a cocatalyst. The resulting catalyst is unique both in its favorable sensitivity to molecular weight control agents such as hydrogen and in its ability to produce a fundamentally different olefin polymer. In accordance with another embodiment of this invention, the chromium is supported on a phosphate base produced using a melt of the aluminum salt.

Abstract: A process is disclosed for polymerizing an olefin to provide a polyolefin of high melt index which comprises contacting the olefin with a catalyst system obtained by heat activating a supported organophosphoryl chromium compound obtained by the reaction of chromium trioxide with an organophosphorous compound having the formula: ##STR1## wherein R is alkyl, aralkyl, aryl, cycloalkyl, or hydrogen, but at least one R is other than hydrogen, and combining the heat activated supported material with a melt index increasing amount of at least one organoborane catalyst modifier having the formula: ##STR2## wherein m and n each is zero or 1, R.sub.1 and R.sub.2 are each a hydrocarbyl group of from 1 to 10 carbon atoms, or one of R.sub.1 and R.sub.2 is hydrogen, or together R.sub.1 and R.sub.2 constitute a hydrocarbyl group of from 2 to 10 carbon atoms.

Abstract: In one embodiment of this invention, a chromium component is supported on a silica/aluminum orthophosphate combination and used with an organometal cocatalyst. In accordance with other embodiments of the invention, the silica/phosphate combination for a chromium catalyst support is produced by either impregnating a silica xerogel with aluminum phosphate or boron phosphate, precipitating aluminum phosphate in the presence of a silica hydrogel, or physically mixing silica and aluminum phosphate xerogels. The resulting catalysts are capable of producing high melt flow olefin polymers and exhibit high activity. The resulting polymers have many unusual and desirable characteristics, such as high density and good environmental stress crack resistance.

Abstract: A catalyst system suitable for olefin polymerization comprising a catalyst component made up of chromium on a phosphated alumina or low phosphorus aluminum phosphate base and optionally an organometal cocatalyst. The resulting catalyst is particularly sensitive to the effects of hydrogen as a molecular weight control agent, thus allowing the production of polymers of having a melt flow varying over a wide spectrum utilizing the same catalyst.

Abstract: In accordance with one embodiment of this invention, a chromium catalyst supported on an aluminum phosphate-containing base is used in conjunction with a boron component either as a part of the base or as a cocatalyst. The resulting catalyst is unique both in its favorable sensitivity to molecular weight control agents such as hydrogen and in its ability to produce a fundamentally different olefin polymer. In accordance with another embodiment of this invention, the chromium is supported on a phosphate base produced using a melt of the aluminum salt.

Abstract: Aluminum orthophosphate is prepared by combining a source of phosphate ions with an aluminum salt to form a concentrated mass, combining with sufficient neutralizing agent to partially neutralize, and aging until gellation occurs. The resulting aluminum phosphate is particularly suited for use as a base for a chromium olefin polymerization catalyst.

Abstract: Aluminum orthophosphate is prepared by combining a source of orthophosphate ions with an aluminum salt to form a concentrated mass, gelling, and thereafter converting the resulting hydrogel to a xerogel by removing water. The resulting aluminum phosphate is particularly suited for use as a base for a chromium olefin polymerization catalyst.

Abstract: A supported vanadium catalyst comprising a vanadium compound on a phosphate-containing base. This catalyst in conjunction with an organoaluminum cocatalyst is capable of giving good activity and producing a polymer having broad molecular weight distribution. The catalyst system is sufficiently sensitive to hydrogen to allow broad leeway in controlling the molecular weight of the resulting polymers.

Abstract: An olefin polymerization catalyst which shows an extremely high activity even at low temperatures and is suited for the production of blow molding polymers, said catalyst comprising a solid component constituted by a chromium compound supported by an inorganic oxide carrier, and an organomagnesium complex compound soluble in the inert hydrocarbons and represented by the general formula: M.sub..alpha. Mg.sub..beta. R.sub.p.sup.1 R.sub.q.sup.2 R.sub.r.sup.3 X.sub.s Y.sub.t (wherein .alpha.>0, .beta.>0, p.gtoreq.0, q.gtoreq.0, r.gtoreq.0, s>0, t.gtoreq.0, 0<(s+t)/(.alpha.+.beta.).ltoreq.1.5 and p+q+r+s+t=m.alpha.+2.beta.; M is an atom selected from the group consisting of aluminum, zinc, boron, beryllium and lithium; m is the valence of M; R.sup.1, R.sup.2 and R.sup.3 may be same or different and represent respectively a hydrocarbon radical having 1 to 20 carbon atoms; X is OSiR.sup.5 R.sup.6 R.sup.7 ; and Y is a radical selected from the group consisting of OR.sup.4, OSiR.sup.5 R.sup.6 R.sup.7, NR.

Abstract: Small amounts of an aluminum alkyl or a dihydrocarbylmagnesium compound are used in slurry olefin polymerization employing a silica supported chromium catalyst in order to reduce the induction period and increase catalyst activity while having only a modest effect on polymer properties.

Abstract: A process and catalyst for polymerizing 1-olefins, for example ethylene, the process comprising (a) supporting a chromium compound on a refractory oxide support material, (b) adding one or more tetravalent titanium compounds, (c) heating the product under such conditions that an active polymerization catalyst is formed, (d) and contacting the monomer with the active polymerization catalyst in the presence of (6) one or more organometallic compounds having wherein the metal is of groups 1A, 2A, 2B and 3A of the Periodic Table (Mendeleef), and (7) a polyene modifier. The refractory oxide support material is preferably silica and the titanium compound is preferably a tetraalkyl titanate. The organometallic compound can be, for example, a triakyl aluminium and the polyene can be for example a conjugated or unconjugated diene.

Abstract: Olefin polymerization catalysts are prepared by depositing an organophosphoryl chromium product and a non-volatile aluminum-containing product obtained from the reaction of an aluminum alkoxide and an aluminum salt of a lower aliphatic monocarboxylic acid on an inorganic support material and heating the support material in a non-reducing atmosphere at a temperature above about 300.degree. C. up to the decomposition temperature of the support material.

Abstract: Olefin polymerization catalysts are prepared by depositing an organophosphoryl chromium product and an aluminum acetyl acetonate on an inorganic support material, and heating the support material in a non-reducing atmosphere at a temperature above about 300.degree. C. up to the decomposition temperature of the support material.

Abstract: Process for polymerizing ethylene or mixtures of ethylene with up to 40 weight % of other 1-olefin(s) by contacting the monomer with a catalyst (A) in the presence of a catalyst modifier (B), catalyst (A) being prepared by supporting chromium trioxide, or a chromium compound calcinable thereto, on a refractory oxide support material and heat activating, catalyst modifier (B) comprising (1) a trihydrocarbyl aluminum compound and (2) an .alpha., .omega.-aliphatic diene containing a chain of at least 6 carbon atoms. The refractory oxide is preferably silica, alumina, zirconia, thoria or silica-alumina. The trihydrocarbyl aluminum compound is suitably an alkyl, aryl or alkaryl aluminum. The .alpha.,.omega.-diene is peferably 1,5-hexadiene or 1,7-octadiene. The polymerization is preferably carried out under particle form process conditions in a fluid medium.

Abstract: Process for polymerizing ethylene, or mixtures thereof with up to 40 wt % of other 1-olefinic monomer comprising contacting the monomer under particle form polymerization conditions at a temperature not greater than 112.degree. C. with a catalyst prepared by heat activating chromium oxide or a compound calcinable thereto, on a refractory oxide support material and a catalyst modifier comprising an aliphatic diene and a trihydrocarbyl boron. The refractory oxide support material can be, for example silica and the heat activation is preferably carried at 400.degree. to 900.degree. C. The aliphatic diene preferably contains 1 to 10 carbon atoms and can be, for example butadiene, isoprene, 1,5-hexadiene, 1,7-octadiene or ethylidene norbornene. The trihydrocarbyl boron, for example trimethyl, triethyl or triisobutyl boron. The quantity of diene is preferably 10 to 5000 moles per gram atom of chromium and the quantity or trihydrocarbyl boron is preferably 0.1 to 20 moles per gram atom of chromium.

Abstract: Polymerization catalysts are prepared by impregnation of a silica or aluminum support with a vanadium, titanium and/or chromium salt decomposable upon calcination to the oxide, calcining the impregnated support at about 500.degree.-700.degree. C., impregnating the calcined support with a solution of aluminum hydride and heating the resultant material to about 300.degree. C.-500.degree. C. in hydrogen. The catalyst is extremely active for the polymerization of lower molecular weight olefins such as ethylene and ethylene-propylene mixtures.

Abstract: Olefin polymerization catalysts are prepared by depositing an organophosphoryl chromium product and a non-volatile aluminum-containing product obtained from the reaction of an aluminum alkoxide and an aluminum salt of a lower aliphatic monocarboxylic acid on an inorganic support material and heating the support material in a non-reducing atmosphere at a temperature above about 300.degree. C. up to the decomposition temperature of the support material.

Abstract: An improved process and catalyst is described for polymerizing .alpha.-alkenes using a catalyst obtained by reacting a chromium-1,3-diketo complex compound having the general formulaCr(OCR.sub.1 CR.sub.2 CR.sub.3 O).sub.3,with an organometallic compound, of a metal from Group II or III of the Periodic Table, contacting the reaction product with an inert inorganic support material, heating said reaction product on said support at a temperature of between about 200.degree. and 1200.degree. C. in a non-reducing atmosphere, combining the resulting product with an organometal compound of a metal from Group II or III of the Periodic Table. The catalysts are highly active and give high yields of polymer. By a proper selection of the pore volume and the particle size of the catalyst support polyalkenes of improved handling properties are obtained.

Abstract: Olefin polymerization catalysts are prepared by depositing an organophosphoryl chromium product and an aluminum acetyl acetonate on an inorganic support material, and heating the support material in a non-reducing atmosphere at a temperature above about 300.degree. C. up to the decomposition temperature of the support material.

Abstract: Olefin polymerization catalysts are prepared by depositing an organophosphoryl chromium product and an aluminum compound on an inorganic support material, and heating the support material in a non-reducing atmosphere at a temperature above about 300.degree. C. up to the decomposition temperature of the support material.

Abstract: A process for the manufacture of olefin polymers by polymerizing .alpha.-monoolefins at relatively low temperatures and relatively low olefin pressures by means of a catalyst obtained from a silicate carrier (component a), an aluminum compound (component b) and a chromium compound (component c). The catalyst is obtained by (1) in a first stage, initially (1.1) charging a particular silicate carrier (component a) with (1.2) a mixture of (1.2.1) an aluminum salt or a mixture of an aluminum salt with up to 80 mole%, based on the salt mixture, of a nickel-II salt (component b) and (1.2.2) a chromium compound (component c), this compound being chromium trioxide or a compound which is converted to chromium trioxide under the conditions of stage (2), by treatment with a solution of the mixture (1.2), and (2), in a second stage then maintaining the product, obtained from stage (1), for a certain time at a high temperature in an anhydrous oxygen-containing gas stream.

Abstract: A novel process is provided for the polymerization of ethylene in which the polymerization catalyst employed in the process is the reaction product of a vanadium ion-exchanged montmorillonite clay and an organometallic compound of a metal of Group II-A, II-B, or III-A of the Periodic Table.

Abstract: Catalysts, especially for olefin polymerization are prepared by coating an aluminum compound on a selected high pore volume silica gel, and calcining the support at temperatures of from about 200.degree. to 2000.degree. F. The preferred catalyst is prepared with an inorganic support material as aforesaid, thereafter depositing an organophosphoryl chromium compound thereon, and activating the thus-treated support by heating in a non-reducing, preferably oxygen-containing, atmosphere at temperatures of from about 800.degree. to 2000.degree. F. The activated, supported catalyst composition may, but need not necessarily, be combined with a metallic and/or non-metallic reducing agent, to provide a catalyst system useful in the polymerization of 1-olefins.

Abstract: The invention is directed to new catalysts consisting of a chromium compound and an organometal compound of an element of Group II or III of the periodic system on a carrier, the process for preparing the catalyst and its use in polymerizing 1-alkenes containing 2 to 8 carbon atoms, optionally admixed with at most 10 mole% of at least one other 1-alkene of 2 to 8 carbon atoms.

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: An olefin polymerization catalyst is prepared by depositing the chromium (III) compound obtained from the reaction of a chromium (III) carboxylate with an aluminum alkoxide upon an inorganic support material and calcining the impregnated support material in a non-reducing atmosphere above 300.degree. C, up to the decomposition temperature of the support material to provide an activated catalyst.

Abstract: A process for the manufacture of olefin polymers by polymerizing .alpha.-monoolefins of 2 to 8 carbon atoms by means of a catalyst which is obtained from a silicate carrier (component a), an organo-metallic compound containing alkoxide groups (component b) and a chromium compound (component c), wherein the catalyst employed is obtained by (1) first charging (1.1) a finely divided porous xerogel (component a) of the formula SiO.sub.2 . m Al.sub.2 O.sub.3, where m is a number from 0 to 2, with (1.2) a particular aluminum compound containing alkoxide groups (component b), (2) then charging (2.1) the product obtained from stage (1) with (2.2) a particular chromium compound (component c) by treatment with a solution of the chromium compound, with intimate mixing and evaporation of the solvent and (3) finally heating the product, obtained from stage (2), in an anhydrous stream of gas containing oxygen.