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5817848 |
Bidentate phosphine ligand
The invention relates to a bidentate phosphine ligand, the phosphorus atoms of the phosphine being connected via a bridge group, the bridge group of the bidentate phosphine ligand consisting of an...
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5792723 |
Platinum catalyst, its preparation, and curable organopolysiloxane composition comprising the same
A platinum catalyst containing (A) a platinum complex having a vinyl-containing organosiloxane ligand and (B) a vinyl-containing organopolysiloxane is prepared by mixing components (A) and (B) such...
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5789333 |
Catalyst system comprising a first catalyst system tethered to a supported catalyst
The present invention provides new catalyst formats which comprise a supported catalyst tethered to a second and different catalyst by a suitable tethering ligand. A preferred system comprises a...
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5789334 |
Microparticle catalysts for hydrosilylation reactions and thermosetting silicone compositions containing said catalyst
A microparticle catalyst for hydrosilylation reactions which contains microparticles of an average particle diameter of 0.1 to 20 μm made of a metallic catalyst for hydrosilylation reactions; a...
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5783715 |
Silylated ferrocenyldiphosphines, silylated ferrocenyldiphosphines bound to inorganic or polymeric organic supports and also metal complexes thereof, their preparation and uses
The invention relates to ferrocenyldiphosphine ligands containing a silylene group, ferrocenyldiphosphines bound to inorganic or polymeric organic supports by this silylene group, their preparation...
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5780698 |
Olefin oligomerization catalyst and process employing and preparing same
According to the present invention, a catalyst is provided which is represented by the formula RC(YR') 2 ! 2 CrX, wherein R and R' are individually selected from the group consisting of carbyl...
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5773548 |
Catalyst for preparing organosiloxanes or polyorganosiloxanes
The invention relates to a catalyst for preparing organosiloxanes and polyorganosiloxanes which are obtained primarily by polycondensation processes. The catalyst of the invention is a reaction...
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5767300 |
Metallocene compound
The present invention relates to a metallocene compound of the formula I which is suitable for olefin polymerization ##STR1## where M is a metal of group IVb, Vb or VIb of the Periodic Table. X...
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5756610 |
Titanium (III) bases and β-diketonate coordinated catalyst composition for preparing high-syndiotacticity polystyrene and processes using the same
A novel titanium (III)-based β-diketonate-coordinated compound is disclosed for catalyzing the polymerization reaction of syndiotactic polystyrenes. The titanium (III)-based compound is...
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5744417 |
Supported catalyst
Disclosed is a supported catalyst which is the reaction product of (a) a silylamine polymer having the general formula ##STR1## where each R is independently selected from alkyl from C 1 to C 6...
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5739073 |
Addition of lithium compounds to ziegler-natta catalysts for increased molecular weight in polyolefins
This invention relates to a conventional supported heterogeneous Ziegler-Natta catalyst for the polymerization of olefins. It has been found that adding a lithium compound to a transition metal...
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5723398 |
Homogeneous, stabilized, reduced metal addition polymerization catalysts, process for preparation and method of use
Addition polymerization catalysts-comprising 1) a Group 4 metal complex in the + 3 oxidation state containing two delocalized π-bonding moieties, and a stabilizing ligand covalently bonded to...
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5712354 |
Bridged metallocene compounds
The invention relates to new transition metal compounds useful as olefin polymerization catalysts. They are characterized by the formula (V)(E)(W)M(L), which in which M is a transition metal, V, E,...
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5708113 |
Catalyst for the preparation and processing of polyorganosiloxanes
The invention relates to catalysts for the preparation and processing of polyorganosiloxanes, in particular for processing silicone resins, for example for solvent-free production of mica...
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5698723 |
Process for the preparation of bistriphenylsilyl chromate
Disclosed is a process for the preparation of bistriphenylsilyl chromate, wherein triphenylchlorosilane, potassium dichromate and any one selected from alkali metal oxides, alkali hydroxides and...
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5686371 |
Conjugated diene polymerisation
A process for the polymerization of one or more conjugated dienes by means of a rare earth based catalyst in which the catalyst is formed by bringing together in liquid hydrocarbon medium in the...
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5670439 |
Vanadium-containing catalyst system
A vanadium-containing catalyst system particularly suited to the polymerization of olefin polymers. The catalyst system includes a supported, first catalyst component prepared by contacting silica...
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5670687 |
Process for preparing SiH-containing organochlorosilanes
The invention relates to a process for preparing organosilanes which contain at least one Si-bonded hydrogen in the presence of a phosphonium catalyst, the phosphonium catalyst itself and also a...
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5661095 |
Olefin polymerization catalyst component supported on a copolymer of an olefin and an unsaturated silane
A catalyst component useful in the polymerization of olefins which includes a support formed of a copolymer of an olefin and a silane monomer having at least one unsaturated hydrocaryl...
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5644009 |
Catalyst composition for preparing high syndiotacticity polystyrene from styrene of other arylethylene monomers and processes using the same
An catalyst composition for preparing high-syndiotacticity polystyrene polymers which comprises: (a) a titanium complex represented by the following formula of TiR' 1 R' 2 R' 3 R' 4 or TiR' 1 ...
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5633394 |
Catalyst compounds for olefin polymerization
Compounds useful as catalyst components for olefin polymerization. The compounds comprise derivatives of cyclopentadienyl complexes of the ZR or HF.
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5625087 |
Silylium cationic polymerization activators for metallocene complexes
Catalyst systems useful in addition polymerization reactions comprising a Group 4 metal complex and a silylium salt activating cocatalyst are prepared by contacting the metal complex with a...
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5620938 |
Epoxydation catalyst
The invention relates to a catalyst for the epoxidation of alkenes using alkylhydroperoxide, the catalyst comprising an ion of one or more of the metals molybdenum, wolfram, titanium or vanadium on...
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5616748 |
Process for preparation of reduced metal titanium complexes
A process for preparing titanium or zirconium hydrocarbyloxide complexes in a reduced oxidation state comprising contacting the corresponding complex in an elevated oxidation state with lithium...
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5616752 |
Metallocenes and processes therefor and therewith
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...
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5612271 |
Process for the prepration of a catalytic system, process for the (co)polymerization of olefins and (co)polymers of at least one olefin
Process for the preparation of a catalytic system according to which a mixture of a halogenated neutral metallocene derived from a transition metal chosen from groups IIIB, IVB, VB and VIB of the...
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5608123 |
Process for catalytic hydration of olefins
There is provided a process for reacting water and olefin such as ethylene or propylene under mild conditions in the presence of a polyorganosiloxane contaminating sulfonic acid groups to produce...
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5605872 |
Functionalized amine initiators for anionic polymerization
A process for the preparation of hydrocarbon solutions of monofunctional amine initiators of the following general structures: ##STR1## wherein M is defined as an alkali metal, selected from the...
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5585451 |
Silicone condensation and/or equilibration catalyst and use
A silanol condensation-equilibration catalyst is provided in the form of a mixture of a linear phosphonitrilic chloride and an effective amount of a protic acid having a pKa≤5, such as HCl. A...
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5583241 |
Fluoroalkyl-substituted ferrocenyl diphosphines as ligands for homogeneous catalysts
Compounds of formula I ##STR1## wherein R 1 is C 1 -C 8 alkyl, phenyl or phenyl which is substituted by 1 to 3 C 1 -C 4 alkyl or C 1 -C 4 alkoxy groups; R 2 is a radical of formula II...
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5571769 |
Process for preparing a metal catalyst with in situ generated carrier for the hydrogenation of organic compounds and catlayst obtained by mean of such a process
A process for preparing a metal catalyst for the hydrogenation of oils and ats comprises causing a soluble Ni salt to react with an alkylsilane and an organic orthosilicate, so as to generate the...
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5561231 |
Homogeneous hydrosilylation catalysts
Transition metal-containing organosiloxanes of at least three organosiloxane units, comprising at least one transition metal complex, chemically bonded via ligands selected from among amino,...
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5547912 |
Solid catalyst component for polymerizing olefins and catalyst containing the same
A solid catalyst component for polymerizing olefins, which can provide a streoregular polymer having a low density of 0.900 to 0.906 g/ml at a high yield and a low RDS and which can prepare the...
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5545793 |
Skeletal isomerisation process for olefins using an alumina-based compound
The invention concerns a process for the skeletal isomerisation of n-olefins containing 4 to 20 carbon atoms, consisting in bringing a feedstock containing the olefins into contact with a catalyst...
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5527929 |
Zwitterionic biscyclopentadienyl complexes
Zwitterionic biscyclopentadienyl, Group 4 transition metal complexes formed with conjugated dienes useful as catalysts for polymerizing olefins, diolefins and/or acetylenically unsaturated monomers.
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5516878 |
Process for the production of aromatic polycarbonate
A process for the production of an aromatic polycarbonate, which comprises polycondensing an aromatic dihydroxy compound and a diaryl carbonate in the presence, as a polycondensation catalyst, of...
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5507940 |
Hydrodenitrification catalyst and process
The instant invention relates to a method for preparing a hydrotreating catalyst having improved hydrodenitrification activity by impregnating an alumina supported Group VIB/Group VIII...
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5496961 |
Triazene oxide-transition metal complexes as hydrosilylation catalysts
Organosilicon compounds having Si-bonded hydrogen atoms are reacted with organic compounds having aliphatic multiple bonds in the presence of triazene oxide-transition metal complexes. The triazene...
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5491266 |
Asymmetric syntheses
This invention relates to asymmetric syntheses in which a prochiral or chiral compound is contacted in the presence of an optically active metal-ligand complex catalyst to produce an optically...
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5438111 |
Formed, polymeric transition-metal complex catalysts with organosiloxane diphenylphosphine ligands
Several method is of preparing formed spherical polymeric complexes of metals of the 8th subgroup of the periodic system with ligands of an organosiloxane copolycondensate optionally cross-linked...
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5416168 |
Protected functional initiators for making terminally functionalized polymers
The anionic polymerization of unsaturated monomers with functionalized initiators having the structure R 1 R 2 R 3 Si--O--A'--Li is improved when each R is methyl and A' is --CH 2 --C 6 H 10 ...
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5410007 |
Particulated platinum group metal containing silicone resin catalyst, method for making, and use
The present invention is directed to solvent free particulated platinum group metal silicone resin catalyst resulting from the spray drying of an organic solvent mixture of a platinum group metal...
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5405815 |
Process for preparing a catalyst system useful in the synthesis of isoprene-butadiene rubber
The subject invention relates to a technique for synthesizing rubbery non-tapered, random, copolymers of 1,3-butadiene and isoprene. These rubbery copolymers exhibit an excellent combination of...
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5391529 |
Siloxy-aluminoxane compositions, and catalysts which include such compositions with a metallocene
A siloxy-aluminoxane composition which is the reaction product of an alkyldisiloxane and an aluminoxane is provided. The compositions in combination with metallocenes of transition metals form...
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5389404 |
Applying catalyst and coating composition containing same to a substrate
Progress for preparing a catalyst for hydrosilylation reactions which comprises reacting (A) a rhodium complex Rh(R 2 S) 3 X 3 , in which R represents alkyl and other specified hydrocarbon groups...
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5362416 |
Suspensions of particles containing transition metal compounds in oils
Suspensions, in oils, of particles containing a transition metal compound, which are spheroidal and of narrow particle size distribution. These suspensions can be employed in processes for the...
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5362699 |
Polymerisation of olefinic-containing monomers employing anionic initiators
Process for anionically polymerizing a conjugated 1,3-diene monomer consists of contacting the monomer in an inert hydrocarbon solvent with a monofunctional silyl ether initiator of general formula...
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5352791 |
Hydrating or oxidizing process using a metal-containing, shaped organosiloxane amine copolycondensate catalyst
Shaped organosiloxane amine copolycondensates are described which contain Pd, Pt, Ru and/or Rh, as well as optional promotors and/or moderators. The shaped copolycondensate function as a carrier...
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5344804 |
Polymerization of cycloolefins and catalytic system suitable for use therein
A catalyst system for the polymerization of cyclic olefins, comprising (1) a tungsten compound which is obtainable by combining a tungsten halide and/or a tungsten oxyhalide with a phenol...
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5330951 |
Catalyst composition for polymerizing alpha-olefin
The catalyst of the invention is useful in preparing high density polymers of controlled molecular weight distribution. A supported alpha-olefin polymerization catalyst composition of this...
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