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6040469 Metallocene compound  
The present invention relates to a metallocene compound of the formula I, ##STR1## where Cp is an unsubstituted or substituted cyclopentadienyl group, Ind is unsubstituted or substituted indenyl, M...
6040401 Saturated tricyclic ligand containing metal complexes and olefin polymerization process  
Bridged, group 4 Metal complexes useful as olefin polymerization catalyst components corresponding to the formula: L 1 ZL 2 MX m X' n or a dimer, solvated adduct, chelated derivative or mixture...
6034192 Germanium bridged metallocenes producing polymers with increased melt strength  
This invention relates to a process for polymerizing ethylene comprising contacting ethylene and optional comonomers with a catalyst system comprising an activator and a transition metal compound...
6034022 Fused ring substituted indenyl metal complexes and polymerization  
Group 4 metal constrained geometry complexes comprising a fused ring indenyl derivative ligand, catalytic derivatives thereof, processes for preparing the same and their use as components of olefin...
6034021 Metal complexes containing bridged, non-aromatic, anionic, dienyl groups and addition polymerization catalysts therefrom  
Catalytic derivatives of novel Group 4 metal complexes wherein the metal is in the +2, +3, or +4 formal oxidation state containing two ligand groups bound by π-electrons, at least one of which is...
6028150 Fullerene-derived metallocene  
The present invention relates to a novel fullerene-derived metallocene. Such fullerene-derived metallocene can be used as the catalyst for preparing olefin polymers.
6025512 Pentafulvene synthesis  
This invention relates to a method to produce pentfulvenes comprising combining a partially substituted cyclopentadiene with a carbonyl containing compound and lithium or an alkyl lithium, wherein...
6018064 Metallocene compounds, synthesis process and use thereof  
It is shown metallocences with functionalized bridge of formula ##STR1## wherein M represents a transition metal from groups 3, 4, 5 or 6, L represents cyclopentadienyl-type ligands, Y represents a...
6015868 Substituted indenyl containing metal complexes and olefin polymerization process  
Group 4 metal complexes comprising an indenyl group substituted in the 2 or 3 position with at least one group selected from hydrocarbyl, fluoro-substituted hydrocarbyl, hydrocarbyloxy-substituted...
6002035 Fullerene-containing metallocene  
The present invention relates to a novel fullerene-containing metallocene. Such a fullerene-containing metallocene can be used as the catalyst for preparing olefin polymers.
6002033 Bridged metallocenes for use in catalyst systems  
Bridged metallocenes of Group IVb metals provide improved results when the bridge comprises a neutral electron-donor substituent of general formula R'" Z R"" j wherein R'" is a rigid...
5998643 Metallocene synthesis  
The process of preparing ansa-metallocene complexes in high yield by reacting a metal leaving group complex with an aluminum ansa-bis-cyclopentadienyl compound.
5990331 Metallocenes containing partially hydrogenated p-ligands  
The present invention relates to a metallocene of the formula I, ##STR1## for preparing polyolefins, where M 1 is preferably Zr, Hf or Ti, R 1 and R 2 are each a hydrogen atom, a C 1 -C 3 ...
5990253 Indenyl compounds and catalyst components for the polymerization of olefins  
The invention relates to an indenyl compound of the general formula R'Ind--M--(Cp)Q k in which the symbols have the following meanings: Ind: an indenyl group R': a substituent, other than...
5986025 Metallocene compound and method for producing polymer by using it as polymerization catalyst  
A novel metallocene compound and a method for producing a polymer by using the metallocene as a polymerization catalyst. The present catalyst includes a neutral metallocene compound, a cationic...
5986120 Metal triflimide complexes  
A composition relating to metal-triflamide complexes useful as catalysts for the syndiotactic polymerization of styrene is disclosed.
5972822 Biscyclopentadienyldiene complex containing addition polymerization catalysts  
Catalysts for polymerizing olefins, diolefins and/or acetylenically unsaturated monomers comprising biscyclopentadienyl, Group 4 transition metal complexes formed with conjugated dienes wherein the...
5968863 Process for the preparation of bridged metallocenes  
It is possible to prepare in high yield and purity the racemic and meso forms of bridged chiral metallocenes with a stereoselective method, by synthesizing the sylil-, germyl- or...
5965678 Catalyst system based on monoazadiene metal complexes  
The present invention relates to a catalyst system based on monoazadiene metal complexes of the formula ##STR1## and a co-catalyst suitable for activating the metal complex, and to the use of the...
5965759 Catalytic process for isomerizing metallocenes  
It has been discovered that the meso form of metallocenes can be catalytically isomerized to the racemic form of the metallocene. This is accomplished by heating an isomerization mixture formed...
5965758 Method for producing bridged type transition metal complex  
A method for producing a bridged type transition metal complex represented by the following formula (1), comprising the following steps (i) and (ii): step (i); a step for reacting a specific...
5959132 Mononuclear and polynuclear transition metal complexes with pentalene ligands bound to single metal atoms  
The invention relates to a complex compound having at least one transition metal atom, characterized in that said complex compound contains at least one pentalene or substituted pentalene ligand...
5948873 Metallocenes, their preparation and use in the polymerization of alpha-olefins  
Catalytic component for the copolymerization of ethylene with alpha-olefins having general formula (I): ##STR1## wherein: A is a cyclopentadienyl derivative having general formula (II) ##STR2## B...
5939503 Group IV zwitterion ansa metallocene (ZAM) catalysts for α-olefin polymerization  
Single component metallocene catalysts for α-olefin polymerization are disclosed. Prior art cation metallocene catalysts have required a separate anion co-catalyst like methyl aluminoxane (MAO)....
5936051 Substituted metallocene catalyst for the (co)polymerization of olefins  
Metallocene complexes of a metal M selected from titanium, zirconium and hafnium, comprising at least one anionic group A containing an η 5 -cyclopentadienyl ring co-ordinated with the metal M,...
5936108 Metallocene synthesis  
A metallocene having one or two hydrocarbyl groups bonded to a Group 4 metal are produced from a crude impure pasty or non-wet mixture containing at least 50% by weight of a metallocene having two...
5929264 Process for the preparation of substituted indenes and their use as ligand systems for metallocene catalysts  
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...
5929266 Chiral organometallic compounds  
A chiral, organometallic compound which, at a molecular level, has no C2 symmetry and comprises a carbon to carbon bond joining a chiral carbon atom to a carbon atom of a cyclopentadiene ring that...
5919961 Chiral compounds  
Chiral compounds of the formula I ##STR1## where the variables are as described in the specification.
5917072 Catalysts for the polymerization of alpha-olefins  
A description follows of catalysts of the metallocene type which can be used in the (co)polymerization of alpha-olefins, particularly in the preparation of elastomeric copolymers of ethylene.
5914408 Olefin polymerization catalysts containing benzothiazole  
A novel metallocene catalyst for the polymerization of olefin (co)polymers is of the general formula: Benzothiazole--E--M--X m L n where, M is a transition metal of Groups 3-10 of the...
5912373 Process for converting the achiral meso form of an ansa-metallocene complex into the chiral racemic form  
The conversion of the achiral meso form of an ansa-metallocene complex into the chiral rac form is carried out photochemically in the presence of a chiral auxiliary reagent.
5912310 Recovery of metallocene complexes  
Metallocene complexes of the formula I ##STR1## where M is titanium, zirconium, hafnium, vanadium, niobium or tantalum, n is an integer from 0 to 10, R 5 is ##STR2## R 11 to R 14 are as...
5906955 Catalyst for polymerization of an olefin, and method for producing an olefin polymer  
A catalyst for polymerization of an olefin, which comprises (a) a transition metal compound of the following formula (1), (2) and/or (3): ##STR1## wherein each of M 1 , M 2 and M 3 is a titanium...
5905162 Enhanced production of bridged hafnocenes  
Racemic, bridged hafnocene is produced in enhanced yield by reacting a hafnium halide-aliphatic polyether adduct that has been formed and/or heated at one or more temperatures of at least about...
5900497 Process for preparing metallocene procatalysts  
A process for producing metallocene procatalysts useful in a catalyst system for the polymerization of olefins, particularly to make stereospecific polymers, and more particularly polymerization to...
5892081 Selective preparation of racemic ansa-metallocene complexes  
The present invention relates to a process for preparing racemic ansa-metallocene complexes I ##STR1## tin compounds II ##STR2## and a process for preparing tin compounds II. R 1 to R 9 , M, and X...
5892082 Process for the preparation of dimethyl titanocene  
The present invention is directed to a process for the preparation of the reagent dimethyl titanocene (Cp 2 Ti(CH 3 ) 2 ) from titanocene dichloride (Cp 2 TiCl 2 ) and a methyl magnesium halide,...
5892075 Process for synthesizing metallocene compounds  
The object of the invention resides in the development of an improved process for synthesizing metallocene compounds useful as olefin polymerization catalysts. A new process for synthesizing...
5892078 Stereorigid metallocene compound  
The present invention relates to a stereorigid metallocene compound which has as ligands at least two substituted or unsubstituted cyclopentadienyl groups which are connected to one another via a...
5892079 Metallocene catalysts and associated methods of preparation and use  
Novel metallocene compounds are provided which are useful as polymerization catalysts, particularly in the polymerization of addition polymerizable monomers such as olefinic or vinyl monomers....
5886202 Bridged fluorenyl/indenyl metallocenes and the use thereof  
Bridged fluorenyl/indenyl metallocenes having substituents at the 3 position of the indenyl and the use thereof in the polymerization of olefins are disclosed. Also a new method for preparing...
5883278 Enhanced synthesis of racemic metallocenes  
Chiral metallocenes are prepared by reacting a salt of an asymmetric bis(cyclopentadienyl) moiety containing ligand with a chelate diamine adduct of a transition, lanthanide, or actinide metal...
5883277 Metallocene complexes with cationic bridges  
Metallocene complexes having a cationic bridge of the formula ##STR1## where the substituents have the following meanings: M is a metal of transition group III, IV, V or VI of the Periodic Table of...
5883275 Process for the hydrogenation of metallocenes  
The present invention relates to a process for the hydrogenation of metallocenes, which comprises treating at least one metallocene containing at least one double bond and/or at least one aromatic...
5880056 Olefin polymerization catalyst and process for olefin polymerization  
Disclosed is an olefin polymerization catalyst comprising (A) a transition metal compound represented by the formula (I) R 1 R 2 MX 2 (wherein M is a transition metal atom, R 1 and R 2 are...
RE36103 Process for the preparation of a syndiotactic polyolefin and catalyst therefor  
A syndiotactic polyolefin is obtained in a high yield by polymerization or copolymerization of an olefin of the formula R a --CHCH--R b in the presence of a catalyst consisting of a...
5869721 Bidentate coordinated trivalent Group IVB metal complex catalyst for preparing syndiotactic vinyl aromatic polymer  
A novel trivalent Group IVB metal complex for preparing syndiotactic vinyl aromatic polymers is disclosed which is coordinated by a bidentate ligand and is represented by the formula (I): (C 5 R...
5863911 Diarylethylene metallocene derivatives, their processes of preparation and pharmaceutical compositions containing said derivatives  
Diarylethylene metallocene derivatives, processes for preparing the same and pharmaceutical compositions which contain the derivatives are disclosed. The compounds of the invention can exhibit...
5861522 Production of bridged metallocene complexes and intermediates therefor  
Bridged metallocene compounds are produced by a process of promising commercial utility for plant-sized operations. One of the key steps of the process involves converting a deprotonated silicon-,...
Matches 251 - 300 out of 510 < 1 2 3 4 5 6 7 8 9 10 11 >