Abstract: In gas phase polymerizations and copolymerizations of ethylene, reagents or cofeeds control the molecular weight, expressed as MI (wherein MI is measured according to ASTM D-1238 Condition E), of the resin product. Use of isopentane and electron donating compounds decrease MI; whereas, electron withdrawing compounds increase MI.

Abstract: Catalysts comprisingA) a rare earth alkoxide, a rare earth carboxylate and/or a rare earth coordination compound with diketones,B) an alumoxane andC) an inert, particulate, inorganic solid with a specific surface area of greater than 10 m.sup.2 /g and a pore volume of 0.3 to 15 ml/gare excellently suited to the polymerisation of conjugated dienes, in particular butadiene, in the gas phase.

Abstract: A supported metallocene complex of a metal M selected from Ti, Zr or Hf, is prepared by a process comprising, in a first step, the reaction of an inorganic carrier containing hydroxyl groups with a compound (II) containing a cyclopentadienyl group and at least one alkoxysilane group reactive with said hydroxyl groups so as to chemically bind said cyclopentadienyl group to said carrier; and in a second step the reaction with a complex of said metal M capable of reacting with said supported cyclopentadienyl group without carrying out any intermediate metallation of the latter. This process is simple and convenient, and enables high concentrations of metal stably bound to the carrier, to be reached. The complex thus obtained can be used as solid component of a catalyst active in the polymerization of .alpha.-olefins, in the presence of a suitable co-catalyst, preferably consisting of an organo-oxygenated derivative of aluminum.

Abstract: A proces for preparing a spherical support for the polymerization of alpha-olefins from an ammonium dawsonite which is spray-dryed and formed into spherical particles which are then calcined and impregnated with titanium to produce a spherical catalyst of good mechanical strength is described. Also described is the polymerization process which, in the presence of the spherical catalyst, yields polyolefin particles which preserve the spherical characteristics of the support, with low flow angle and good bulk density, as well as the product polyethylene obtained from the process.

Abstract: Homo- or co-polymers derived from one or more alpha-olefins having a number average molecular weight of up to 15,000 and an isotacticity of 75% or greater, and their use as Cold Flow Improvers in crude, fuel or lubricating oil.

Abstract: A supported Lewis acid catalyst system for catalyzing hydrocarbon conversion reactions including cationic polymerization, alkylation, isomerization and cracking reactions is disclosed, wherein the catalyst system comprises an inorganic oxide support having immobilized thereon a least one strong Lewis acid comprising at least one metal salt of a strong Bronsted acid wherein the metal is selected from the group consisting of aluminum, boron gallium, antimony, tantalum, niobium, yttrium, cobalt, nickel, iron, tin, zinc, magnesium barium strontium, calcium, tungsten, molybdenum and the metals of the lanthanide series and wherein the strong Bronsted acid is selected from the group consisting of mineral and organic acids stronger than 100% sulfuric acid.

Abstract: A process for producing an alpha-olefin polymer, which comprises polymerizing an alpha-olefin in the presence of a catalyst formed from(A) a solid catalyst component comprising an inorganic carrier and deposited thereon a compound of a transition metal of Group IVB of the periodic table treated with an organometallic compound, and(B) an aluminoxane.

Abstract: This invention is generally directed toward a supported catalyst system useful for polymerizing olefins. The invention particularly relates to a supported metallocene catalyst system that does not require an activator or cocatalyst for the polymerization of olefins.

Abstract: A supported catalyst component for an olefin polymerization catalyst comprising a solid particulate support, a magnesium halide, and optionally a Group 4 or 5 transition metal compound, a Group 2 or 13 organometal compound, and an electron donor, wherein a majority of particles of the solid particulate support is in the form of an agglomerate of subparticles. A process for preparing this supported catalyst component. A catalyst composition comprising this catalyst component and a cocatalyst. An olefin polymerization process using such a catalyst composition.

Abstract: Copolymers of propylene with other 1-alkenes, obtainable by gas-phase polymerization of a mixture of propylene and another 1-alkene in the absence of a liquid reaction medium under a pressure of from 15 to 30 bar, at from 60.degree. to 90.degree. C. and with an average holdup time of the polymer of from 1 to 5 hours, with the aid of a Ziegler-Natta catalyst system which, besides a titanium-containing solid component, contains an aluminum component and an electron donor, with the temperature being chosen so that, under the preset pressure, no condensation of the monomer mixture takes place in the gas space and, moreover, the ratio of the partial pressures of propylene and the other 1-alkene is adjusted to from 5:1 to 100:1, are particularly suitable for producing sheets and shaped articles.

Abstract: In gas phase polymerizations and copolymerizations of ethylene, temperature controls the molecular weight, expressed as MI (wherein MI is measured according to ASTM D-1238 Condition E), of the resin product. Increase in polymerization temperature produces decrease in MI; whereas, decrease in polymerization temperature produces increase in MI.

Abstract: Disclosed herein are a novel process for the preparation of alkylsilanes and alkenyl silanes by hydrosilylation of their corresponding silanes and unsaturated hydrocarbons in the presence or absence of a catalyst, a process for the preparation of polyalkenylsilanes (some of which are novel high molecular compounds) by the anionic coordination polymerization, radical polymerization or ionic polymerization of the alkenylsilanes, and a process for the production of silicon carbide by using these polyalkenylsilanes as prepolymers.

Abstract: A method is provided for forming a supported cyclopentadiene-type compound comprising contacting a cyclopentadiene-type compound containing an active halogen with an inorganic support having surface hydroxyl group. Also there is provided a method of preparing a supported metallocene comprising reacting the supported cyclopentadiene-type compound with a transition metal compound under suitable conditions. There is also provided a process for producing bridged cyclopentadiene-type ligands having a bridge having branch that has a terminal vinyl group. Also metallocenes of these ligands are provided. Still further there is provided a process for producing bridged cyclopentadiene-type ligands having a bridge having a branch that has a terminal active halogen. The resulting new ligands and supported metallocenes produced therefrom are also provided.

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: A composition is provided comprising a metallocene having the formula of: ##STR1## wherein each Z can be the same or different hydrocarbyl radical selected from the group consisting of cyclopentadienyl, indenyl, tetrahydroindenyl, fluorenyl, and mixtures thereof; each X can be the same or different and is selected from the group consisting of hydrogen, fluorine, chlorine, bromine, iodine, R, OR, NR.sub.2, PR.sub.2, or OQ, or mixtures thereof wherein the R is a C.sub.1 -C.sub.20 hydrocarbyl radical and Q is an inorganic moiety selected from the group consisting of silica, alumina, clay, phosphated alumina, and mixtures thereof; each Y can be the same or different and is an alkyl group, hydrogen, fluorine, chlorine, bromine, iodine, or mixtures thereof; E is selected from C, Sn, Si, Ge, B, Al, N, or P; M is a metal selected from Ti, Zr, Hf, Sc, Y, V, or La; m is a number sufficient to fill out the valences of metal M; and n is 1 or 2.

Abstract: A novel polymerization catalyst system comprising a diluent, a substrate, a nickel compound wherein the nickel is in a zero oxidation state and picolinic acid and a method for making such catalyst system is described. The polymerization catalyst system can be used in a process for the polymerization of polymerizable olefins.

Abstract: Catalysts comprising (a) derivatives of mono, bi and tricyclopentadienyl coordination complexes with a transition metal and (b) and an alumoxane are employed in a process of producing polyolefins of controlled molecular weight.

Abstract: Disclosed is a catalyst system for the homopolymerization and copolymerization of alpha-olefins having 2-8 carbon atoms, said catalyst system comprising a cyclopentadienyl Group 6b metal compound having at least one oxo, thio, imido or phosphido group bonded directly to the Group 6b metal, and at least one organic radical bonded to the Group 6b metal through a carbon atom, said Group 6b metal compound being supported on an inorganic support. The catalyst system may also contain a Group 2 or Group 3 metal alkyl compound cocatalyst.

Abstract: A process for producing sticky polymers at polymerization reaction temperatures in excess of the softening temperatures of the sticky polymers in a fluidized bed reactor in the presence of an inert particulate material which comprises utilizing as a support material for the catalyst, a support which includes silica having an average particle size of from about 60 to about 200 microns.

Abstract: This invention relates to catalyst systems, and a method for using such system, for the enhanced production of homo and copolymer products of olefin, diolefin and/or acetylenically unsaturated monomers. This invention catalyst system comprises a Group III-A element compound for improving the productivity of an olefin polymerization catalyst which is the reaction product of a metallocene of a Group IV-B transition metal and an ionic activator compound comprising a cation capable of donating a proton which will irreversibly react with at least one ligand contained in the Group IV-B metal compound and an anion which is bulky, labile and noncoordinateable with the Group IV transition metal cation produced upon reaction of the metallocene and activator compound to form the catalyst component of the catalyst system.

Abstract: An improved polymerization process for making essentially nonagglomerated ethylene polymers, especially EPR polymers, based on the use of a stage-modified high activity vanadium catalyst, under polymerization conditions that normally would yield an undesirable amount of agglomerated polymer.

Abstract: A process for polymerizing olefins wherin a suitable amount of a fumed refractory oxide is used to improve the flow of particulate catalyst as a slurry of that catalyst is charged to the polymerization zone.

Abstract: A supported catalyst for ethene polymerization by Phillips catalysis is disclosed. The supported catalyst is prepared by (1) mixing a porous silicate in an inert, organic liquid to produce a silicate suspension, (2) providing an ester of phosphoric acid or phosphorous acid, (3) mixing an organic liquid, a chromium compound, and a trialkylaluminum compound to produce a chromium compound/aluminum compound and combining the silicate suspension, the phosphorus compound and the chromium compound/aluminum compound suspension. This resulting suspension is evaporated to dryness to form a catalyst intermediate. The catalyst intermediate is heated in nitrogen, then heated in an oxygen-containing atmosphere, and then heated again in nitrogen to produce an activated catalyst. The activated catalyst is suspended in an organic liquid and treated with an alkyl boron compound to produce the desired supported catalyst.

Abstract: There is described a process for the production of pigment/plastic premixes characterized by homogeneous distribution of pigment in a polymer matrix. The invention is based on the polymerization of olefins carried out by means of a process using Ziegler catalyst. Significantly the polymerization occurs on the surface of the pigment particles, after the prior activation of the pigment particles.

Abstract: A process for producing polyethylene is disclosed in which ethylene is polymerized in the presence of a composite catalyst. The catalyst is made up of a solid catalyst component typified by a selected chromium compound, a modified aluminum compound typified by a trialkylaluminum and an R.sub.n.sup.1 Al(OR.sup.2).sub.3-n compound wherein R.sup.1 and R.sup.2 are represented by selected hydrocarbon groups and n by 0.ltoreq.n.ltoreq.3. The polymer has improved melt index, flow parameter and melt tension characteristics.

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: A process for dimerizing ethylene comprising contacting ethylene with an insoluble solid catalyst and a cocatalyst, said catalyst having at least on the surface thereof hydrocarbyl ortho ester groups bonded to vanadium or titanium.

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: A process for producing ethylene copolymers by copolymerizing ethylene with an .alpha.-olefin having 3 to 10 carbon atoms in the gas phase polymerization method in the presence of a catalyst comprising such a solid component, component (A), that a zirconium compound having formed a II-bonding with a conjugated five-membered ring such as bis(cyclopentadienyl)zirconium dichloride is carried on a support of porous particles of a water-insoluble inorganic oxide such as silica which have been preliminarily treated with an alumoxane, and an alumoxane, component (B), characterized in that the alumoxane as the component (B) is in the form of a solution in an aromatic hydrocarbon in a concentration of at least 5% (w/v) and the component (A) and the component (B) are introduced into a polymerization vessel after they have been contacted with each other.

Abstract: There is disclosed a highly active catalyst composition for polymerizing alpha-olefins prepared by treating a support with an organomagnesium composition and contracting the thus formed solid support, containing magnesium, in a liquid medium with a transition metal compound, e.g., a tetravalent titanium compound. This catalyst is particularly useful for the production of linear low density polyethylene polymers. Also disclosed are methods of preparing polymers with the catalyst composition and the resulting polymers.

Abstract: A process using a high activity supported metallocene-alumoxane catalyst, comprising methylalumoxane and bisindenyl zirconium dichloride on a silica support, for the copolymerization of ethylene and 1,4-hexadiene to produce a copolymer having a high concentration of pendant functionalizeable groups which may also be used to cross-link the copolymer.

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 process for producing sticky polymers at polymerization reaction temperatures in excess of the softening temperature of the sticky polymers in a fluidized bed reactor catalyzed by a transition metal catalyst, which comprises conducting the polymerization reaction above the softening temperatures of the sticky polymers in the presence of about 0.3 to about 60 weight percent, based on the weight of the final product of an inlet particulate material having a mean particle size of from about 0.01 to about 10 micron meters whereby polymer agglomeration of the sticky polymers is maintained at a size suitable for continuously producing the sticky polymers.

Abstract: Description of the preparation of a Ziegler type catalyst system through impregnation of a special alumina with 0.8-1.0% by weight of titanium derived from a dilute solution of titanium halide in n-hexane, the activator employed being triisobutylaluminum or triethylaluminum at an (Al)/(Ti) molar ratio of 2.5/1 to 80/1 in the catalyst. The catalyst system has high efficiency and yield, and leads to polyethylenes of excellent physical and mechanical properties which make it particularly suitable for use in engineering plastics.

Abstract: An olefin, particularly alpha-olefin, supported catalyst composition, containing a transition metal or a compound thereof and an activator, has an average pore diameter of about 20 to about 300 Angstroms, at a substantially constant catalyst particle size for a given range of average pore diameters. The catalyst produces polymers having gradually decreasing molecular weight distribution with decreasing pore size of the catalyst at a constant particle size.

Abstract: The supported catalyst for the polymerization of 1-alkenes is obtained by a consecutive depositing on the insert inorganic oxide of silicium and/or aluminium at least one organic compound of aluminium, at least one compound of titanium and vanadium and at least one organic compound of aluminium and/or magnesium. It can be phlegmatized by 0.5-50% w/w of the paraffinic hydrocarbon having melting point 25-150.degree. C., which is coated either together with active components of the catalyst or separately. The catalyst polymerize and copolymerize ethylene without any additional activation.

Abstract: Ziegler-Natta catalysts for polymerizing .alpha.-olefins are prepared by the addition of tetrakis(dialkylamide or diarylamide) derivatives of titanium, and a metal-containing reducing agent such as ethyl aluminum dichloride to a suitable support material such as magnesium chloride. Olefins are polymerized in the presence of these supported catalysts and an aluminum containing cocatalyst or activator such as triethylaluminum.

Abstract: A catalyst and its use in polymerizing olefins, wherein the catalyst is prepared by contacting a support with a compound of titanium and/or vanadium.

Abstract: A process for polymerizing or copolymerizing a member of the group consisting of an alpha olefin or mixtures thereof, consisting of the steps of:polymerizing an alpha olefin in a polymerization reactor using a polymerization catalyst, a cocatalyst, and an amount of hydrogen adjusted for molecular weight control as measured by melt flow;rapidly changing the melt flow of the polymerized alpha olefin from high to low melt flow by reacting a portion of the unreacted hydrogen in the reactor with a quantity of the alpha olefin present therein by interaction with a hydrogenation catalyst; andremoving the hydrogenation catalyst from the reactor through continuous exchange of the reactor contents.

Abstract: Alumina is calcined and thereafter given a phosphating treatment. The resulting composition is particularly suitable for a support for a transition metal compound such as chromium oxide to provide an olefin polymerization catalyst. The resulting catalyst is capable of producing polymer at unusually high productivity rates and also gives the ability to produce high melt flow polymer.

Abstract: A supported solid catalyst composition for polymerizing alpha-olefins is prepared by treating a carrier with a transition metal compound. The carrier utilized in the synthesis must have such an average pore diameter that the resulting catalyst composition has an average pore diameter of at least about 170 Angstroms. The catalyst composition has higher productivity than similar catalyst compositions of lower average pore diameter, and it produces polymers of lower density and higher melt and high load melt indexes than such similar catalyst compositions of lower average pore diameter. Also disclosed is a process for polymerizing alpha-olefins in the presence of the catalyst of the invention.

Abstract: A catalyst composition for polymerizing alpha-olefins is prepared by treating a carrier containing OH groups with a liquid solution containing an excess of an organomagnesium composition with respect to the OH groups and contacting the thus-formed magnesium-containing carrier with a solution of at least one transition metal compound. Prior to contacting the magnesium-containing carrier with the transition metal compound, most of the liquid must be removed therefrom, so that it comprises not more than about 6% of the liquid. The amount of the transition metal compound is such that the molar ratio of the transition metal to magnesium in the reaction mixture is about 0.3 to about 0.9. Also disclosed is a process for polymerizing alpha-olefins in the presence of the catalyst of the invention.

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 composition for polymerizing alpha-olefins is prepared by treating a carrier containing OH groups with a liquid solution containing an excess of an organomagnesium composition with respect to the OH groups and contacting the thus-formed magnesium-containing carrier with a solution of at least one transition metal compound. Prior to contacting the magnesium-containing carrier with the transition metal compound, most of the liquid must be removed therefrom, so that it comprises not more than about 6% of the liquid. The amount of the transition metal compound is such that the molar ratio of the transition metal to magnesium in the reaction mixture is about 0.3 to about 0.9. Also disclosed is a process for polymerizing alpha-olefins in the presence of the catalyst of the invention.

Abstract: A catalyst composition for polymerizing alpha-olefins in a gas phase continuous process is prepared by combining a catalyst precursor with a catalyst activator in such proportions that the polymer product comprises about 9.times.10.sup.-7 to about 18.times.10.sup.-7 gram-moles of the activator per gram of the polymer produced. The use of the activator in these proportions lowers the partial pressure of the monomers used in the process without sacrificing quality of the product. The catalyst precursor is prepared by reacting a carrier having OH groups with a stoichiometric excess, with respect to the OH groups, of an organomagnesium composition, and subsequently reacting the product with a transition metal compound.

Abstract: A catalyst composition for polymerizing alpha-olefins is prepared by treating a carrier containing OH groups with an organomagnesium composition and contacting the thus-formed magnesium-containing carrier with a solution of at least one tetravalent vanadium compound. Alternatively, the solution may also contain at least one tetravalent titanium compound in addition to the vanadium compound, thereby producing catalysts containing both, vanadium and titanium. Also disclosed is a process for polymerizing alpha-olefins in the presence of the catalysts of the invention.

Abstract: A supported solid catalyst composition for polymerizing alpha-olefins is prepared by treating a carrier with a transition metal compound. The carrier utilized in the synthesis must have such an average pore diameter that the resulting catalyst composition has an average pore diameter of at least about 170 Angstroms. The catalyst composition has higher productivity than similar catalyst compositions of lower average pore diameter, and it produces polymers of lower density and higher melt and high load melt indexes than such similar catalyst compositions of lower average pore diameter. Also disclosed is a process for polymerizing alpha-olefins in the presence of the catalyst of the invention.

Abstract: A suspension which comprises an inert liquid medium, a solid material, and a transition metal compound is dried using a spray-drying technique. The spray-drying is effected under conditions of temperature and pressure which are such as to cause evaporation of the liquid medium. The solid material is preferably in a finely-divided form. The solid material may consist essentially of a transition metal compound or may be a transition metal compound which is supported on a suitable solid inert matrix material. Alternatively, a suspension of a solid support material in a solution of a transition metal compound may be used. The dried solid is obtained as an agglomerate. The agglomerated solid can be mixed with an organic compound of a non-transition metal to give an olefin polymerisation catalyst system.

Abstract: The specification discloses pentaalkylcyclopentadienyl actinide complexes and their use as catalysts for polymerizing lower molecular weight alkenes.

Abstract: A process for production of styrene polymers of high syndiotactic configuration is disclosed, comprising polymerizing styrene or styrene derivatives by the use of a catalyst comprising: (A) a titanium compound, e.g., at least one compound selected from those represented by the formulae: TiR.sup.1.sub.a R.sup.2.sub.b R.sup.3.sub.c X.sup.1.sub.4 -(a+b+c) and TiR.sup.1.sub.d R.sup.2.sub.e X.sup.1.sub.3-(d+e) (all the symbols are as defined in the appended claims); and (B) a contact product of an organoaluminum compound and a condensation agent, e.g., a product resulting from modification of trimethylaluminum with water. Because of such high syndiotactic configuration, the styrene polymers are greater in thermal resistance and solvent resistance than conventional atactic polystyrene.