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6984743 |
Method for producing metallocenes
The present invention relates to a process for preparing a metallocene, which comprises reacting a ligand starting compound with an adduct of the formula (I),
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6984703 |
Bridged metallocene compounds as olefin-polymerization catalysts
The present invention relates to metallocene compounds consisting of indenyl-cyclopentadienyl groups non-symmetrically joined by a bivalent radical. Said compounds can be conveniently used as...
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6984603 |
Organometal catalyst compositions
This invention provides catalyst compositions that are useful for polymerizing at least one monomer to produce a polymer. This invention also provides catalyst compositions that are useful for...
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6982307 |
Matrix and process for polyolefin production
Olefin-based materials react with a range of catalysts and catalytic systems to form catalytic matrices, which are employed in the production of a variety of polyolefin products.
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6964937 |
Bimetallic catalyst for producing polyethylene resins with bimodal molecular weight distribution, its preparation and use
Bimetallic catalyst for producing polyethylene resins with a bimodal molecular weight distribution, its preparation and use. The catalyst is obtainable by a process which includes contacting a...
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6960676 |
Method of preparing group 14 bridged biscyclopentadienyl ligands
The present invention relates to ligands and the synthesis of those ligands for use in metallocene complexes. More particularly, the present invention relates to the synthesis of diarylsilyl...
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6960635 |
Isotactic propylene copolymers, their preparation and use
Unique copolymers comprising propylene, ethylene and/or one or more unsaturated comonomers are characterized as having: at least one, preferably more than one, of the following properties: (i) 13...
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6960550 |
Catalyst systems for high melting thermoplastic elastomeric α-olefin polymers and plastomers
A metallocene catalyst system component for polymerization of olefins includes at least one 2-arylindenyl ligand substituted on the 1-position by a substituted or unsubstituted alkyl, alkylsilyl,...
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6958408 |
Ligands with at least a fluorosilcone substituent useful for preparing metal-locenes
The invention concerns ligands with at least a fluorosilicone substituent of general formulae (I) and (II); a method for preparing them and their use for producing catalysts useful for olefin...
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6956089 |
Polymerization process
The invention provides for polymerization catalyst compositions, and for methods for introducing the catalyst compositions into a polymerization reactor. More particularly, the method combines a...
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6956088 |
Polyethylene films with improved physical properties
Metallocene catalyzed polyethylenes are found to have improved physical properties, improved processability and improved balance of properties. Surprisingly, there is a direct relationship between...
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6956002 |
Process for polymerization of olefins
A catalyst for olefin polymerization, comprising:
a solid catalyst component comprising [A] a solid component having substantially no hydroxyl group, [B] a compound of a transition metal...
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6953831 |
Ethylene polymers
An ethylene polymer excellent in molding processability represented by uniform extensibility, drawdown resistance, swell and extrudability, and mechanical properties represented by rigidity, impact...
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6949614 |
Catalyst system
A catalyst system comprising a metallocene, a cocatalyst, a support material and optionally a further organometallic compound is described. The catalyst system can advantageously be used for the...
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6946531 |
Low molecular weight ethylene interpolymers and polymerization process
Low molecular weight olefin polymers are prepared by a polymerization process employing titanium complexes comprising a 3-aryl-substituted cyclopentadienyl ring or substituted derivatives thereof...
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6943227 |
Catalyst for olefin polymerization and method of polymerization of olefin
The present invention provides a catalyst for olefin polymerization having high olefin polymerization activity without being accompanied by generation of an adhered polymer on the wall of a...
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6943225 |
Multinuclear metallocene catalyst
The present invention relates to a multinuclear metallocene catalyst for olefin polymerization and a process for olefin polymerization using the same, in which the multinuclear metallocene catalyst...
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6943133 |
Diene functionalized catalyst supports and supported catalyst compositions
The present invention relates to functionalized catalyst supports that are useful in the formation of supported polymerization catalysts, supported catalysts derived from such functionalized...
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6939930 |
Hydrosilane additives for increased polyolefin molecular weight
A process for polymerizing olefins is disclosed. The process uses a hydrosilane in a polymerization catalyzed by an open architecture, bridged indenoindolyl organometallic complex and an activator....
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6939929 |
Alpha-olefin-aromatic vinyl copolymer
The α-olefin-aromatic vinyl compound copolymer of the present invention is obtained by using a transition metal compound represented by the following Formula (1) and a promoter component to carry...
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6939928 |
Metallocene compound, process for producing metallocene compound, olefin polymerization catalyst, process for producing polyolefin, and polyolefin
The metallocene compound according to the invention and the olefin polymerization catalyst containing the compound are intended to produce a catalyst capable of preparing an isotactic polymer with...
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6936667 |
Polymerization catalyst compositions and processes to produce polymers and bimodal polymers
A process to produce a first catalyst composition is provided. The process comprises contacting at least one first organometal compound and at least one activator to produce the first catalyst...
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6932592 |
Metallocene-produced very low density polyethylenes
A very low density polyethylene having a density of 0.890 to 0.915 and a Dart Drop value of at least about 450 g/mil or above is disclosed. Gas phase polymerization methods are also disclosed for...
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6930158 |
Substituted polycyclic cyclopentadienes and method for their preparation
New polycyclic cyclopentadiene compounds having the formula (II) wherein the various substituents and symbols R1, R2, R3, R4, R5, R6, R7, Z1 and Z2 and “n” have the meaning specified in the...
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6930157 |
Catalyst composition for preparing olefin polymers
A catalyst composition for preparing olefin polymers. The catalyst composition includes a metallocene compound and an activating cocatalyst. In the metallocene compound, two cyclopentadienyl groups...
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6924342 |
Method of making interpolymers and products made therefrom
A polymerization process comprises contacting one or more olefinic comonomers in the presence of at least a high molecular weight catalyst and at least a low molecular weight catalyst in a single...
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6924248 |
Catalyst system for carrying out olefin polymerization comprising a calcined hydro-talcite serving as a supporting material
Catalyst system for olefin polymerization comprising
A) at least one calcined hydrotalcite, B) at least one organic transition metal compound, C) optionally one or more cation-forming compounds...
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6921800 |
Modified aluminum oxy compound, polymerization catalyst and process for producing olefin polymer and alkenyl
A modified aluminum oxy compound (A) obtained by reacting an aluminum oxy compound (a), water (b) and a compound having a hydroxyl group (c); a polymerization catalyst component comprising the...
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6919414 |
Copolymers and films thereof
Novel copolymers comprise ethylene and alpha olefins having from 3 to 10 carbon atoms and which have
(a) a density in the range 0.900 to 0.940 (b) Mw/Mn of 2-3.4 (c) I 21 /I 2 from 16 to 24...
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6919412 |
Monocyclopentadienyl complexes of chromium, molybdenum or tungsten with a donor bridge
Substituted monocyclopentadienyl, monoindenyl, monofluorenyl or heterocyclopentadienyl complexes of chromium, molybdenum or tungsten, wherein at least one of the substituents of the...
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6916892 |
Method for transitioning between Ziegler-Natta and metallocene catalysts in a bulk loop reactor for the production of polypropylene
The present invention relates to propylene polymerization process in a bulk loop reactor, and particularly to propylene polymerization process for polymerizing commercial quantities of...
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6914108 |
Catalyst component for addition polymerization, catalyst for addition polymerization, and process for producing addition polymer
An electron-withdrawing group-containing metal compound (I) of an atom of the Group III to the Group XII or lanthanide series of the Periodic Table of the Elements, a catalyst component for...
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6911508 |
Class of metallocenes and method of producing polyethylene
The invention provides a catalyst system and a method of making polyethylene using the catalyst system, the method comprising combining ethylene; an activator; and a metallocene catalyst compound;...
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6908974 |
Catalyst composition and a process for preparing linear, isotactic polymers
The invention concerns a metallocene catalyst composition for preparing linear isotactic polymers, wherein said catalyst composition contains a metal complex and an activator. The invention also...
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6908973 |
Single-site catalysts for olefin polymerization
A method for making single-site catalysts useful for olefin polymerization is disclosed. A nitrogen-functional heterocycle is first deprotonated with an alkyllithium compound, followed by reaction...
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6908877 |
Supported polymerization catalyst using a catalyst precursor having functional group and surface modified carrier and olefin polymerization using the same
Support within the disclosure of the present application can only be found for the treatment of the dehydrated silica catalyst carrier with a silazane compound and not with a silane compound. The...
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6908876 |
Supported metallocene catalyst system for olefin polymerization, method for making and using the same
The present invention relates to a supported catalyst system for olefin polymerization which comprises at least one metallocene component and a support of an inorganic oxide of silica, aluminum or...
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6906155 |
Propylene polymer and composition containing the same, molded object and laminate comprising these, and processes for producing propylene polymer and composition containing the same
A propylenic polymer according to the present invention or a composition thereof have an excellent melt flowability and contains a less amount of stickiness-causing components, and also has a low...
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6903170 |
Olefin polymerization process using triisobutylaluminum as a scavenger
Ethylene and optional comonomers are polymerized using a supported metallocene catalyst, an alumoxane activator, and triisobutylaluminum (TIBAL). A silica support is first pretreated with a silane...
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6900343 |
Method for the purification of metallocenes
A process for purifying metallocenes in which a sparingly soluble metallocene halide is converted into a readily soluble and readily crystallizable metallocene by replacement of at least one halide...
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6900154 |
Methods of forming a supported activated catalyst composition
Processes of forming a supported activated catalyst composition and method of polymerization are disclosed, the process of forming the composition including combining a halogenated aromatic...
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6897273 |
Catalyst composition, method of polymerization and polymer therefrom
This invention relates to a process to polymerize olefin(s) comprising combining a solution, slurry or solid comprising one or more bulky ligand metallocene catalyst compounds, an optional support,...
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6894131 |
Polymerization process using a metallocene catalyst system
Provided is a process for polymerizing olefins in the presence of a metallocene catalyst compound having at least one fluoride or fluorine containing leaving group. More particularly, the present...
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6894128 |
Catalyst composition, method of polymerization, and polymer therefrom
Catalyst compositions and methods useful in polymerization processes utilizing at least two metal compounds are disclosed. At least one of the metal compounds is a Group 15 containing metal...
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6891005 |
Bridged metal complexes for gas phase polymerizations
A gas phase olefin polymerization wherein the catalyst comprises a novel Group 4 transition metal complex containing a boron or aluminum bridging group containing a nitrogen containing group,...
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6891004 |
Transition metal catalyst component for polymerization, and method for producing a polymer by means thereof
A transition metal catalyst component for polymerization, composed of a metal complex comprising specific ligands and a specific substituted boron group and having a bridging group, which exhibits...
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6887819 |
Compositions that can produce polymers
This invention provides compositions that are useful for polymerizing at least one monomer into at least one polymer.
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6887818 |
Supported titanium catalyst system
A supported titanium catalyst system comprising a titanium catalyst bound via at least one heteroatom, a functionalized support, said heteroatom being connected to said support via an organic group.
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6884857 |
Olefin polymerization process using supported constrained geometry catalysts
Metal complexes having constrained geometry and a process for preparation thereof, addition polymerization catalysts formed therefrom, processes for preparation of such addition polymerization...
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6884749 |
Supported catalysts which reduce sheeting in olefin polymerization, process for the preparation and the use thereof
Olefin polymerization in the presence of heterogeneous supported catalysts is improved by incorporating into the supported catalyst a unifunctional hydrophobic tether comprising a hydrophobic...
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