Matches 301 - 350 out of 510 < 1 2 3 4 5 6 7 8 9 10 11 >
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5861352 Supported metallocene catalyst for olefins (co)polymerization  
A solid catalyst component for the polymerization and copolymerization of ethylene and alpha- olefins, containing a metallocene supported on an inorganic solid carrier constituted by a porous...
5859276 Organotransition metal compounds  
New metallocene compounds (II) and their synthetic intermediates (I) used for olefin polymerization catalysts represented by the general formulas (I) and (II) ##STR1## (wherein X can be identical...
5859272 Transition metal compound, olefin polymerization catalyst component comprising the transition metal compound, olefin polymerization catalyst comprising the olefin polymerization catalyst component, and process for olefin polymerization  
Disclosed is a novel transition metal compound represented by the following formula: ##STR1## wherein M is a transition metal, X is halogen or the like, R 1 is a hydrocarbon group or the like, R 2...
5856541 Process for preparing 1 3-disubstituted cyclopentadienyl ligands and transition metal complexes thereof  
The invention relates to an improved process which, starting from 2-cyclopenten-1-ones substituted in the 3-position, gives a high yields of 1,3-dialkylcyclopentadienes which can be directly...
5854363 (Omega-alkenyl) (cyclopentacarbyl) metallocene compounds  
An (omega-alkenyl) (cyclopentacarbyl) metallocene compound is provided. Polymerization processes therewith are also provided.
5852142 Process for the preparation of an olefin polymer  
The invention relates to a process for the preparation of a compound of the formula IV or IVa ##STR1## in which R 1 -R 5 are preferably hydrogen or alkyl, which comprises reacting a compound I...
5847176 Preparation of chiral titanocenes  
A method for producing dialkylsilyl (2-alkyl-4-aryl indenyl) titanocenes including rac-Me 2 Si(2-methyl-4-phenylindenyl)-titanium dichloride is described.
5840947 Organometallic compound  
The present invention relates to a metallocene compound of the formula I R 5 n Cp 1 Cp 2 M 1 R 1 R 2 (I) where Cp 1 and Cp 2 are, independently of one another, identical or different...
5831106 Preparation of bridged metallocene complexes  
A process for preparing metallocene complexes of the general ##STR1## in which the substituents have the following meanings: M is titanium, zirconium, hafnium, vanadium, niobium or tantalum, ...
5830821 Process for olefin preparation using metallocenes having benzo-fused indenyl derivatives as ligands  
Metallocenes having benzo-fused indenyl derivatives as ligands, processes for their preparation and their use as catalysts A very effective catalyst system for olefin polymerization comprises a...
5830958 Polynuclear metallocene preparation and use  
A process for preparing polynuclear metallocenes by reacting a metallocene in which one of the cyclopentadienyl-containing radicals has a substituent having olefinic or acetylenic unsaturation with...
5824620 Heterogeneous metallocene catalysts and use thereof in olefin polymerization process  
This invention is related to a method for the preparation of heterogeneous catalysts, useful for the production of poliolefins. The method is characterized because said catalysts are obtained by...
5821310 Organometallic compounds and catalyst compositions  
There is provided an organometallic compound comprising a metal M of Group 3 to 6 of the Periodic Table or the Lanthanide series and at least one (hetero)cyclohexadienyl ligand of the general...
5817724 Olefin polymerization method using a highly active catalyst having a multidentate ligand  
Disclosed is an olefin polymerization method using a highly active catalyst comprising a transition metal selected from metals of Groups IIIA including the lanthanide series, IVA, VA, VIA, VIIA and...
5807936 Transition metal compound  
The present invention relates to a transition metal compound of the formula I L n (X m A t R 1 q ) s MY r (I), where M is a metal atom of group IIIb, IVb, Vb or VIb of the Periodic...
5792819 Process for the preparation of an olefin polymer  
The present invention relates to zwitterionic neutral transition metal compounds. The compounds are suitable as catalyst components for the polymerization of olefins.
5780659 Substituted indenyl unbridged metallocenes  
Unbridged metallocenes of titanium, zirconium and hafnium having an unsubstituted cyclopentadienyl radical and an indenyl radical having in at least one of the 1, 2, or 3 positions a substitutent...
5780660 Zirconocene ismerization process  
An essentially anhydrous agitated mixture of (i) finely-divided essentially anhydrous alkali metal fluoride (e.g., KF), (ii) haloaromatic compound having at least one halogen atom of atomic number...
5776851 Metallocenes, process for their preparation and their use as catalysts  
The present invention relates to a polynuclear metallocene compound of the formula I ##STR1## a process for their preparation and their use as a catalyst for olefin polymerization.
5770755 Process to prepare polymeric metallocenes  
Processes to prepare polymeric metallocene are provided. Said processes comprise reacting a polymeric ligand, an alkali metal compound, and a transition metal-containing compound to produce said...
5770666 Organic transition metal compound and process for the preparation of polyolefin using same  
A novel organic transition metal compound is disclosed, which is represented by the following formula (1): ##STR1## wherein the all symbols are defined in the disclosure. A polymerization catalyst...
5770752 Process for reducing the concentration of by-products in product mixtures  
The present invention relates to a process for reducing the concentration of organometallic and/or inorganic by-products in product mixtures formed in the synthesis of metallocenes, which comprises...
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...
5763542 Process for the preparation of an olefin polymer using specific metallocenes  
A highly effective catalyst system for the polymerization of olefins comprises a cocatalyst, preferably an aluminoxane, and a metallocene of the formula I ##STR1## where M 1 =Zr or Hf, R 1 and R...
5753578 Metallocene catalyst for the (CO)polymerization of α-olefins  
A catalyst active in the (co)polymerization of α-olefins is obtained by putting the following components in contact with each other: (i) a "bridged" bis-metallocene derivative of a metal M...
5747614 Catalyst for producing sytrenic polymer and process for producing sytrenic polymer by using same  
A catalyst for producing a styrenic polymer which comprises an (A) transition metal compound having one and only one π-ligand comprising only one indenyl group, said indenyl group bearing a...
5739366 Transition metal compound containing substituted indenyl rings  
The novel transition metal compound of the invention is represented by the following formula (I): ##STR1## wherein M is a transition metal; R 1 and R 2 are each a hydrogen atom, a hydrocarbon...
5726335 Zirconium compounds, their preparation and their use as catalysts  
Novel mononuclear Z IV trihydride, monoalkyl dihydride and deuteride compounds are prepared and are used as catalysts in dehydrocoupling reactions.
5726264 Processes to produce metallocene compounds and polymerization processes therewith  
A process to produce an ethylene-bridged-metallocene-transition-metal compound that has an omega-alkenyl substitution on said ethylene bridge is provided. Said process comprises: contacting a...
5723640 Transition metal compound having indenyl-containing metallocene  
The novel transition metal compound of the invention is represented by the following formula (I): ##STR1## wherein M is a transition metal; R 1 is a hydrocarbon group of 2 to 6 carbon atoms, R 2 ...
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...
5714427 Catalyst system comprising two zirconocenes and aluminoxane  
A catalyst system comprising an aluminoxane and a transition-metal component (metallocene) is used, the transition-metal component comprising at least one zirconocene of the formula I ##STR1## and...
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,...
5712404 Cyclopentadienyl-type ligands, metallocene compounds catalyst systems, preparation and use  
In accordance with the present invention there is provided a process for preparing a cyclopentadienyl-type ligand comprising reacting an alkali metal compound and a fulvene-type compound to form a...
5710223 Process for polymerizing propylene by using a novel metallocene catalyst  
A process for polymerizing propylene utilizes a metallocene catalyst component of the formula (I) ##STR1## wherein M is a transition metal, R 1 is a C 2 -6 hydrocarbon, R 2 is a C 6 -16 aryl...
5710297 Metallocenes, and their use as catalysts  
The present invention relates to a stereorigid metallocene compound containing, as ligands, at least two substituted or unsubstituted cyclopentadienyl groups which are bonded to one another via a...
5708150 Process for preparing transition metal complexes containing disubstituted cyclopentadienyl ligands  
A process for preparing transition metal complexes containing disubstituted cyclopentadienyl ligands of the general formula (1) ##STR1## in which a monomeric, monosubstituted cyclopentadiene is...
5708101 Stereospecific olefin polymerization catalysts  
A metallocene catalyst system for the polymerization of α-olefins to yield stereospecific polymers including syndiotactic, and isotactic polymers. The catalyst system includes a metal and a ligand...
5703257 Synthesis of cyclopentadienyl metal coordination complexes from metal hydrocarbyloxides  
A process for preparing bridged mono- and bis(cyclopentadienyl) metal dihydrocarbyloxy coordination complexes (I) by contacting in the presence of an aprotic organic diluent a metal compound of the...
5688880 Readily supportable metal complexes  
Metal complexes useful as olefin polymerization catalysts corresponding to the formula: ##STR1## wherein: L is a delocalized, π-bonded group that is bound to M, containing up to 50 nonhydrogen...
5679811 Hafnium metallocene compound  
A very efficient catalyst system for the polymerization of 1-olefins consists of an aluminoxane and a metallocene which is a compound of the formula I ##STR1## in which R 1 and R 2 denote...
5679812 Compound useful for the preparation of a 1-olefin polymer  
A very efficient catalyst system for the polymerization of 1-olefins consists of an aluminoxane and a metallocene which is a compound of the formula I ##STR1## in which R 1 and R 2 denote...
5679816 Preparation of biscyclopentadienyl diene complexes  
Biscyclopentadienyl, Group 4 transition metal complexes containing a conjugated diene ligand group wherein the diene is bound to the transition metal either in the form of σ-complex or a...
5677409 Syndiotactic polypropylene wax, production process thereof, and heating roll fixing-type toner composition making use of the wax  
Described herein are propylene waxes and a production process thereof. The waxes are each produced by polymerizing propylene in a reaction vessel while using a solid catalyst in the presence or...
5670436 Metallocene compound  
The present invention relates to an unbridged metallocene compound which is suitable for olefin polymerization.
5670680 Method for producing octahydrofluorenyl metal complexes  
Octahydrofluorenyl metal complexes, such as octahydrofluorenyltitanium trichloride, or ring substituted octahydrofluorenyl metal complexes wherein the metal is in the +2, +3 or +4 formal oxidation...
5670681 Process for preparing a carbon-bridged biscyclopentadiene compound  
The present invention relates to a process for preparing a carbon-bridged biscyclopentadiene compound by reacting one or two cyclopentadiene compounds LH with a carbonyl compound in the presence of...
5661096 Catalysts and cocatalysts for the preparation of polyolefins  
In the case of Ziegler catalysts based on a metallocene as the transition metal component and an aluminoxane as the activator, preactivation of the metallocene with the aluminoxane results in a...
5659054 Preparation of monocyclopentadienyl metal complexes by nucleophilic substitution of bis(cyclopentadienyl) metal complexes  
Bridged monocyclopentadienyl derivatives of a Group 4 metal are prepared by contacting a corresponding bis(cyclopentadienyl) metal complex with an alkali metal derivative or alkaline earth metal...
5646083 Process for the preparation of a bridged metallocene compound as well as a catalyst component and a process for the polymerization of olefins  
The invention relates to a process for the preparation of a bridged metallocene compound in which: (I) a bridged double ligand, reacting with a proton acceptor, is converted into a bridged...
Matches 301 - 350 out of 510 < 1 2 3 4 5 6 7 8 9 10 11 >