Matches 351 - 400 out of 510 < 1 2 3 4 5 6 7 8 9 10 11 >
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5646323 Process for preparing metallocene compounds  
In accordance with the present invention there is provided a cyclopentadienyl-type ligand represented by the formula ZA, wherein Z is a cyclopentadienyl-type group, wherein A is --YPR 2 , --YNR 2 ,...
5641871 Preparation of metallocenes in one reaction step  
Metallocenes are prepared by a process in which a metal salt is reacted with at least one alkali metal and with an unsaturated, cyclic hydrocarbon in the presence of a solvent in one reaction step.
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.
5631203 Metallocene compounds and preparation thereof containing terminal alkynes  
Metallocene compounds and processes for preparing such metallocene compounds are provided. Such processes for preparing such metallocene compounds comprise reacting an alkynyl ligand, an alkali...
5629254 Substituted indenyl ring containing metallocene catalyst for propylene polymerization process  
The novel transition metal catalyst of the invention is represented by the following formula (I): ##STR1## wherein M is a zirconium or hafnium; R 1 is a hydrocarbon group of 2 to 6 carbon atoms, R...
5627247 Organometallic fluorenyl compounds and use thereof in olefin polymerization  
Unbridged fluorenyl containing metallocenes are disclosed along with methods for making the metallocenes. Also disclosed are methods for using the metallocenes as polymerization catalysts. In...
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...
5616747 Process for the preparation of bridged, chiral metallocene catalysts of the bisindenyl type  
A process for the preparation of a compound of the formula III ##STR1## comprising, deprotonating a solution or suspension of an indene of the formula I ##STR2## in a solvent or solvent mixture...
5612462 Process for preparing bridged stereorigid metallocenes  
The invention relates to a new improved process for preparing bridged stereorigid metallocenes via organomagnesium and organotin compounds.
5594080 Thermoplastic elastomeric olefin polymers, method of production and catalysts therefor  
This invention is directed to novel catalysts the structure and activity of which can be controlled to produce a wide range of alpha olefin polymers and co-polymers, and preferably for the...
5594081 Catalyst component for the polymerization of α-olefins and a process for preparing α-olefin polymers with use of same  
The present invention provides a catalyst for polymerizing an α-olefin which is capable of producing an α-olefin polymer having a high molecular weight in a high yield under the polymerization...
5587501 Process for the preparation of syndiotactic polyolefins having a broad molecular weight distribution  
Syndiotactic polyolefins having a molecular weight distribution M w /M n of >3 and which may be monomodal, bimodal or multimodal are obtained by polymerization or copolymerization of olefins...
5585509 Metallocene complexes having heterofunctional groups in the cyclopentadienyl system  
Metallocene complexes of the general formula I ##STR1## where the substituents Y, M, x, R 1 , R 2 , R 3 , R 4 , R 6 , R 7 , R 8 , and R 9 are as described in the disclosure, and ligand systems of...
5585508 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.
5571880 Organometallic fluorenyl compounds and use thereof in an alpha-olefin polymerization process  
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,...
5569746 Process for preparing alkylsubstituted cyclopentadienyl metallocene compounds  
A process for making a metallocene, said process comprising the steps of (a) reacting an alkylsubstituted cyclopentadiene ligand, which contains a mixture of endo- and exo-isomers, with up to about...
5565592 Vinly-substituted bridged metallocenes  
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...
5565396 Catalyst systems and polymerization processes  
In accordance with the present invention there is provided a cyclopentadienyl-type ligand represented by the formula ZA, wherein Z is a cyclopentadienyl-type group, wherein A is --YPR 2 , --YNR 2 ,...
5563284 Cyclopentadienyl-type ligands, metallocenes, catalyst systems, preparation, and use  
In accordance with the present invention there is provided a cyclopentadienyl-type ligand represented by the formula ZA, wherein Z is a cyclopentadienyl-type group, wherein A is --YPR 2 , --YNR 2 ,...
5541350 Amido silyldiyl bridged catalyst components, methods of making and using  
Disclosed is a mono- or di-amido silyldiyl bridged composition of matter useful as a catalyst component for the homo or copolymerization of olefins.
5541272 High activity ethylene selective metallocenes  
Unbridged indenyl-containing metallocenes are disclosed along with methods for making the metallocenes. Also disclosed are methods for using the metallocenes as polymerization catalysts. In...
5539124 Polymerization catalysts based on transition metal complexes with ligands containing pyrrolyl ring  
Disclosed is an azametallocene polymerization catalyst having the general formula ##STR1## where L is a ligand, or mixture of ligands, each having 4 to 30 carbon atoms and containing at least two...
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.
5523435 Process for the synthesis of monomethylmetallocenes and dimethylmetallocenes and their solutions specifically for use in the polymerization of olefins  
Disclosed is a process for preparing methyltransition metal compounds in which the halide metallocene precursor to be alkylated is initially charged in a hydrocarbon desired for the subsequent...
5510502 Catalyst component for use in the polymerization of α-olefins and process for producing α-olefin polymers using the same  
A catalyst component for use in the polymerization of α-olefins, comprising a compound represented by the following general formula I!: ##STR1## wherein R 1 s represent a hydrogen atom, a C 1 -6...
5498581 Method for making and using a supported metallocene catalyst system  
Methods are disclosed for preparing a highly active solid metallocene-containing catalyst system and its use in the polymerization of olefins. The catalyst system is prepared by creating a catalyst...
5496854 Metallocenes as anti-tumor drugs  
The invention relates to novel titanocene derivatives possessing chemotherapeutic activity and method for their preparation. These compounds possess two cyclopentadiene rings linked to titanium as...
5491205 Preparation of polymers of C.sub.2 -C.sub.10 -alk-1-enes using racemic metal-locene complexes as catalysts  
Polymers of C 2 -C 10 -alk-1-enes are prepared at from 0.5 to 3000 bar and from -50° to 300° C. using a catalyst system by a process in which the catalyst system used is one which contains, as...
5474716 Process for the preparation of bridged cyclopentadienylmagnesium compounds and use thereof for preparing metallocenes  
Disclosed are processes for the preparation of new bridged cyclopentadienylmagnesium compounds of the general formula Q(CpR a )(Cp'R' a ')Mg, and the use thereof for preparing bridged metallocenes.
5468889 Boryl zirconocene organic 1,1-dimetallic compounds  
Boron-zirconium 1,1,-dimetallic organic compounds useful in organic synthesis such as the preparation of alpha-bromoboranes. The boron-zirconium compounds include boron and zirconiun, and in...
5451649 Organometallic fluorenyl compounds, preparation, and use  
Benzofluorenyl-containing metallocenes are disclosed along with methods for making the metallocenes. Also disclosed are methods for using the metallocenes as polymerization catalysts. In addition,...
5449651 Metallocene compound for a catalyst component with good catalyst efficiency after aging  
This invention relates to a syndiospecific metallocene of a substituted iPr[(cyclopentadienyl)(fluorenyl)]zirconium dichloride containing long-chain terminal alkene, for example octenyl groups, on...
5446221 Oleaginous compositions containing novel ethylene alpha-olefin polymer viscosity index improver additive  
The present invention is directed to a lubricating oil composition exhibiting improved viscosity index comprising lubricating oil and a viscosity improving effective amount of ethylene alpha-olefin...
5420320 Method for preparing cyclopentadienyl-type ligands and metallocene compounds  
In accordance with the present invention there is provided a process for preparing a cyclopentadienyl-type ligand, the process comprises (1) reacting an alkali metal salt of a cyclopentadienyl-type...
5405981 Copper catalyzed coupling reactions  
A general method for sequential addition of two substituents to an α,β-unsaturated ketone (enone), involving 1,4-conjugate addition of a desired substituent group to the enone to form an...
5391789 Bridged, chiral metallocenes, processes for their preparation and their use as catalysts  
Bridged, chiral metallocenes, processes for their preparation and their use as catalysts Metallocenes of the formula I ##STR1## in which, preferably, M 1 is titanium, zirconium or hafnium, R 1 is...
5384342 Vinyl ether urethane silanes  
The present invention is directed to a compound of the Formula: R 1 --R 2 --R 3 --R 4 --A--(R 5 ) n (R 6 ) 3 -n wherein: A is Si or Ti; R 1 is an alkenoxy, acryloxy or ethylenically...
5374752 Process for the preparation of a high molecular weight olefin polymer  
A very active catalyst system for olefin polymerization comprises a cocatalyst, preferably an aluminoxane, and a metallocene of the formula I ##STR1## in which, preferably, M 1 is Zr or Hf, R 1 ...
5359102 Transition metal compound having two transition metal atoms in one molecule and method for polymerizing olefin by using the compound  
A transition metal compound represented by the formula ##STR1## (wherein each of A 1 , A 2 , A 3 and A 4 is a cyclopentadienyl group, an indenyl group, a fluorenyl group or their derivative; A 5 ...
5349100 Chiral metallocene compounds and preparation thereof by creation of a chiral center by enantioselective hydride transfer  
There are provided enantiomerically enhanced chiral substituted cyclopentadienyl ligands, and compounds thereof, and a process for their making comprising contacting an optionally substituted...
5347024 Preparation of addition polymerization catalysts via Lewis acid mitigated metal center oxidation  
Addition polymerization catalysts comprising a derivative of a titanium or zirconium in the +4 oxidation state prepared by metal center oxidation and cation complex formation of a reduced metal...
5340701 Fluorine-free titanocenes and the use thereof  
Fluorine-free titanocene compounds of the formula I or II ##STR1## in which both R 1 radicals are preferably, independently of one another, cyclopentadienyl .crclbar ., which is unsubstituted or...
5336795 Process for the preparation of transition metal complexes having monosubstituted cyclopentadienyl ligands  
Disclosed is a process for the preparation of transition metal complexes having monosubstituted cyclopentadienyl ligands of the general formula: ##STR1## in which monomeric cyclopentadiene is...
5329033 Process for the preparation of an olefin polymer  
A very effective catalyst system for olefin polymerization consists of a cocatalyst, preferably an aluminoxane, and a metallocene of the formula (I) ##STR1## in which, preferably, M 1 is Zr, R 1 ...
5306600 Oxygen-containing titanocenes, and the use thereof  
Titanocenes of the formula I ##STR1## in which R 1 are cyclopentadienyl .crclbar . groups and R 2 and R 3 are aromatic radicals which are substituted in both ortho-positions by fluorine and, in...
5302733 Preparation of metallocenes  
A racemic mixture of a chiral, silicon bridged transition metal metallocene, which is substantially free of meso isomer, is precipitated directly from a reaction mixture as it is formed by reacting...
5286889 Transmetalations from zirconium to copper intermediates  
Higher order cuprate complexes are prepared by means of a transmetalation from a corresponding zirconate intermediate. This process is particularly valuable with respect to the preparation of...
5281733 Process for producing MMT  
A process for the carbonylation of substituted metal coordination compounds in the presence of carbon monoxide at a pressure in excess of 400 psig to produce optionally substituted cyclopentadienyl...
5279999 Catalyst composition  
A catalyst composition obtained by contacting (a) a Group IVA metal compound of the general formula (Cp) p MeX 4 -p wherein Cp is, independently, cyclopentadienyl groups substituted with one or...
5276208 Metallocenes containing ligands of 2-substituted idenyl derivatives, process for their preparation, and their use as catalysts  
The novel metallocenes of the formula I ##STR1## in which, preferably, M 1 is Zr or Hf, R 1 and R 2 are alkyl or halogen, R 3 and R 4 are hydrogen, R 5 and R 6 are alkyl or haloalkyl, --(CR...
Matches 351 - 400 out of 510 < 1 2 3 4 5 6 7 8 9 10 11 >