Abstract: A method for preparing a silica supported, &agr;-olefin polymerization catalyst includes the steps of treating a silica support with an organosilane compound, contacting the silylated silica support with a transition metal compound to form an intermediate, then contacting the resulting intermediate with an alkylmagnesium alkoxide to form the catalyst. The transition metal compound is either a metal chloride or a metal chloroalkoxide, and the transition metal is selected from titanium, vanadium, and zirconium. The alkylmagnesium alkoxide may be selected from butylethylmagnesium butoxide, butylethylmagnesium 2-ethylhexoxide, butyloctylmagnesium ethoxide, or butylmagnesium propoxide. The process steps may be carried out in the presence of an aliphatic organic solvent, such as heptane, with a slurry of solids in the solvent being formed during the process steps.

Abstract: The present invention relates to a process for preparing a metallocene catalyst system, which comprises reacting a metallocene starting compound in a solvent with a compound capable of transferring hydrocarbon radicals and converting the resulting metallocene compound which is &sgr;-substituted by one or more hydrocarbon radicals in solution without isolation into a polymerization-active catalyst system by means of an activator.

Abstract: This invention relates to a peroxide-containing catalyst composition which contains 60 to 80% by weight of a ketone peroxide component (A), 10 to 20% by weight of a ketone ester component (B) and 10 to 20% by weight of an inhibitor component (C), wherein the sum of the percentages by weight of components (A), (B) and (C) adds up to 100% by weight. The invention also relates to the use of the peroxide-containing catalyst composition as a starter peroxide composition in the pultrusion process.

Abstract: A composition, comprising (a) a compound of formula I (R1R2R3P)xLyM2+Z1−Z2−   (I), wherein R1, R2 and R3 are each independently of one another H, C1-C20alkyl, C1-C20-alkoxy; C4-C12cycloalkyl which is unsubstituted or substituted by C1-C6-alkyl, C1-C6haloalkyl or C1-C6alkoxy; C4-C12cycloalkoxy which is unsubstituted or substituted by C1-C6-alkyl, C1-C6haloalkyl or C1-C6alkoxy; C6-C16aryl which is unsubstituted or substituted by C1-C6alkyl, C1-C6haloalkyl or C1-C6alkoxy; C6-Cl6aryloxy which is unsubstituted or substituted by C1-C6alkyl, C1-C6haloalkyl or C1-C6alkoxy; C7-C16-aralkyloxy which is unsubstituted or substituted by C1-C6alkyl, C1-C6haloalkyl or C1-C6alkoxy; or C7-C16aralkyloxy which is unsubstituted or substituted by C1-C6alkyl, C1-C6-haloalkyl or C1-C6alkoxy; or R2 and R3 together are tetra- or pentamethylene which is unsubstituted or substituted by C1-C6alkyl, C1-C6haloalkyl or C1-C6alkoxy; tetra- or pentamethylenedioxyl which is unsubstituted or substituted by C1-C6al

Abstract: Fluorenyl-containing metallocenes are disclosed along with methods for making the metallocenes. Also disclosed are methods for using the metallocenes as polymerization catalysts. In addition, polymers resulting from such polymerizations are disclosed.

Abstract: Porous microcomposites have been prepared from perfluorinated ion-exchange polymer and metal oxides such as silica using the sol-gel process. Such microcomposites possess high surface area and exhibit extremely high catalytic activity. The microcomposites catalyze, among others, the reaction between organic aromatic compounds and olefins.

Abstract: A ruthenium-containing metathesis catalyst system which contains a ruthenium compound (A), a phosphorus, arsenic, or antimony compound (B), and a compound (C) containing at least one carbon-to-carbon triple bond. The mole ratio of compounds A:B:C is typically in the range of about 1.0:0.01-100:0.01-500. The ruthenium compound (A) is a Ru(II), Ru(III), or Ru(IV) compound containing an anionic ligand (X) and optionally an arene ligand and optionally a phosphorus, arsenic, or antimony compound ligand. The compound (B) is optional if the ruthenium compound (A) contains a phosphorus-, arsenic-, or antimony-containing ligand. Hydrogen gas is used as an activator. A process for metathesis of olefins involves reacting at least one olefin with the catalyst system described herein.

Abstract: A ruthenium-containing metathesis catalyst system which contains a ruthenium compound (A), a phosphorus compound (B), and a compound (C) containing a carbon-to-carbon triple bond. The mole ratio of compounds A:B:C is typically in the range of about 1.0:0.01-100:0.01-100. The ruthenium compound (A) is a Ru(II), Ru(III), or Ru(IV) compound containing an anionic ligand (X) and optionally an arene ligand and optionally a phosphorus compound ligand. The phosphorus compound (B) is optional if the ruthenium compound (A) contains a phosphorus-containing ligand. The catalyst system is employed in processes to metathesize olefins, including ring-opening metathesis polymerization of cyclic olefins, metathesis of acyclic olefins, acyclic diene metathesis oligomerization or polymerization, cross-metathesis of cyclic and acyclic olefins, ring-closing metathesis, metathesis depolymerization of unsaturated polymers, and metathesis of functionalized olefins.

Abstract: The invention relates to a catalyst composition for olefin polymerization comprising metallocene complexes and novel cocatalysts belonging to the group of perfluorinated oligoarylaluminates, oligoarylthioaluminates and oligoarylaminoaluminates. These cocatalysts are produced by two alternative synthetic methods, either by reacting alkylalumoxanes with pentafluorophenol, pentafluorothiophenol, or with pentafluoroaniline, respectively; or in two-step processes comprising first reacting trialkylaluminum compounds with said perfluorinated agents and then by reacting the products of the first step with water. Catalyst systems containing these cocatalysts and metallocene complexes are active in polymerization and copolymerization reactions of ethylene and alpha-olefins.

Abstract: The supported catalyst disclosed herein is a contact product of two components. One component is the contact product of silica containing hydroxyl groups and alumoxane. This second component is the paraffinic-hydrocarbon soluble contact product of a metallocene compound of a transition metal and a trialkylaluminum compound.

Abstract: A composition, comprising(a) a compound of formula I(R.sub.1 R.sub.2 R.sub.3 P).sub.x L.sub.y M.sup.2+ Z.sub.1.sup.- Z.sub.2.sup.- (I),whereinR.sub.1, R.sub.2 and R.sub.3 are each independently of one another H, C.sub.1 -C.sub.20 alkyl, C.sub.1 -C.sub.20 -alkoxy; C.sub.4 -C.sub.12 cycloalkyl which is unsubstituted or substituted by C.sub.1 -C.sub.6 alkyl, C.sub.1 -C.sub.6 haloalkyl or C.sub.1 -C.sub.6 alkoxy; C.sub.4 -C.sub.12 cycloalkoxy which is unsubstituted or substituted by C.sub.1 -C.sub.6 -alkyl, C.sub.1 -C.sub.6 haloalkyl or C.sub.1 -C.sub.6 alkoxy; C.sub.6 -C.sub.16 aryl which is unsubstituted or substituted by C.sub.1 -C.sub.6 alkyl, C.sub.1 -C.sub.6 haloalkyl or C.sub.1 -C.sub.6 alkoxy; C.sub.6 -C.sub.16 aryloxy which is unsubstituted or substituted by C.sub.1 -C.sub.6 alkyl, C.sub.1 -C.sub.6 haloalkyl or C.sub.1 -C.sub.6 alkoxy; C.sub.7 -C.sub.16 aralkyl which is unsubstituted or substituted by C.sub.1 -C.sub.6 alkyl, C.sub.1 -C.sub.6 haloalkyl or C.sub.1 -C.sub.6 alkoxy; or C.sub.7 -C.sub.

Abstract: A polyolefin metallocene catalyst which includes two metallocene components, a stereorigid isospecific metallocene catalyst component and a stereorigid syndiospecific metallocene catalyst component, both of which are supported upon the same support. A method of forming a catalyst system includes contacting the above catalyst with a cocatalyst or Lewis acid. A method of polymerization includes contacting an olefin of at least 3 carbon atoms with the catalyst system.

Abstract: The invention relates to solid catalyst components for the polymerization of olefins CH.sub.2 .dbd.CHR, in which R is hydrogen or a hydrocarbyl radical with 1-12 carbon atoms, comprising Ti, Mg, halogen and an electron donor compound selected from cyanoesters of formula (1): ##STR1## wherein R.sub.1 is a C.sub.1 -C.sub.20 linear or branched alkyl, alkenyl, cycloalkyl, cycloalkylalkyl, alkylcycloalkyl, aryl, arylalkyl or alkylaryl group; n is 0, 1, 2 or 3; R.sub.2, R.sub.3, R.sub.4 and R.sub.5 are independently selected from hydrogen or C.sub.1 -C.sub.20 linear or branched alkyl, alkenyl, cycloalkyl, cycloalkylalkyl, alkylcycloalkyl, aryl, arylalkyl or alkylaryl groups; two or more of R.sub.2 and R.sub.3, and R.sub.4 and R.sub.5, can be joined to form a cycle. Said catalyst components when used in the polymerization of olefins are characterized by an excellent response to hydrogen and capability to produce polymers with broad Molecular Weight Distribution.

Abstract: This invention relates to supported metallocene catalyst compositions useful for addition reactions of prochiral .alpha.-olefins. Polymers, specifically propylene polymers, produced with this catalyst possess higher stereoregularities and consequently higher melting points compared to propylene polymers produced using previously known supported metallocene catalysts. The microstructure of the polymers obtained using the supported catalyst systems of this invention is similar to that obtained using analogous unsupported catalysts. The catalyst compositions comprise transition metal (i.e., metallocene) cations and beam comprising anionic activators in prescribed ratios on metal or metalloid oxide supports. The transition metal compound is represented by the formula: ##STR1## wherein M is selected from the group consisting of titanium, zirconium, hafnium, vanadium, niobium, tantalum, chromium, molybdenum and tungsten;R.sup.1 and R.sup.2 are identical or different, and are one of a hydrogen atom, a C.sub.1 -C.

Abstract: This invention relates to single site catalyst systems comprising activated bimetallocyclic transition metal compounds, and the use of these catalyst systems for the polymerization of ethylenically and acetylenically unsaturated monomers. The bimetallocyclic compounds comprise two metal atoms, selected from the group consisting of Group 4 or Group 5 metal atoms, connected through two covalent bridging links so as to form a cyclic compound having delocalized bonding in the cyclic structure. The exemplary bimetallocyclic compound bis-M-(trimethylsilyl-methylidyne) tetrakis-(trimethylsilylmethyl) ditantalum activated with alumoxane and borate compounds is shown to be useful for preparing ethylene polymers having M.sub.n of at least 267,000 and MWD of about 2.3.

Abstract: The present invention relates to a high activity catalyst composition for the (co-)polymerisation of ethylene, optionally with an alpha olefin of 3 to 10 carbon atoms, comprising a catalyst precursor and an organoaluminium cocatalyst, wherein the catalyst precursor consists of:(i) a silica carrier material, having from 0.3 to 1.2 mmoles of OH groups per gram of silica,(ii) a dialkylmagnesium compound of the formula RMgR.sup.1, where R and R.sup.1 are the same or different C.sub.2 -C.sub.12 alkyl groups, in an amount comprised between 0.5 to 1.5 mmoles of dialkylmagnesium per gram of silica,(iii) a tetraalkyl orthosilicate, in which the alkyl groups contain from 2 to 6 carbon atoms, in an amount comprised between 0.2 to 0.8 mmoles per gram of silica,(iv) a chlorinated compound (X) having the formula R.sub.n SiCl.sub.4-n, wherein each R is the same or different and is hydrogen or an alkyl group and n is an integer from 0 to 3, in an amount comprised between 0.

Abstract: The production of cerium oxides, zirconium oxides, (Ce,Zr)O.sub.2 mixed oxides and (Ce,Zr)O.sub.2 solid solutions having improved particle size distribution, surface area, oxygen storage capacity and pore volume by the addition of an additive, such as anionic surfactants, nonionic surfactants, polyethylene glycols, carboxylic acids, and carboxylate salts, during the formation of the oxides or precursors thereof.

Abstract: Salts of (polyfluoroaryl)fluoroanions of aluminum, gallium, and indium are described. The (polyfluoroaryl)fluoroanions have the formula [ER'R"R'"F].sup..crclbar. wherein E is aluminum, gallium, or indium, wherein F is fluorine, and wherein R', R", and R'" is each a fluorinated phenyl, fluorinated biphenyl, or fluorinated polycyclic group.

Abstract: There is provided a catalyst containing a transition metal precursor having the formula (C.sub.5 R.sup.1.sub.5)MQ.sub.3, a bulky non-phenolic compound, an aluminoxane, and optionally a Br.phi.nsted acid and/or a support or spray drying material. There is also provided a polymerization process employing the catalyst composition, a polymer produced using the catalyst, and a cable produced therefrom.

Abstract: The present invention relates to a supported composition, to processes for its preparation and to its use for polymerizing olefins. The supported catalyst composition comprises at least one transition metal compound of subgroup 3, 4 or 5 of the ##STR1## Periodic Table of the Elements and at least one cocatalyst having the formula II in which R.sup.6 independently at each occurrence are a halogen atom or a C.sub.1 -C.sub.40 carbon-containing group, X is independently at each occurrence a C.sub.1 -C.sub.40 carbon containing group, M.sup.