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6673881 |
Process for the preparation of low molecular weight hydrogenated nitrile rubber
A hydrogenated nitrile rubber having lower molecular weights and narrower molecular weight distributions than those known in the art can be prepared by the olefin metathesis of nitrile butadiene...
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6673880 |
Bridged zirconocene compounds, process for their preparation and their use as catalyst components in the polymerization of olefins
Zirconocene compounds with two indenyl ligands linked in the 2 position by means of a two-carbon-atoms divalent bridging group can be suitably used as components of catalysts for the polymerization...
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6673882 |
Supported single-site catalysts useful for olefin polymerization
A method for making supported single-site catalysts useful for olefin polymerization is disclosed. An organometallic complex that contains a nitrogen-functional heterocyclic ligand is first...
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6670432 |
Olefin polymers formed by use of constrained geometry addition polymerization 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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6667274 |
Polymerization catalysts
A process to produce a polymer is provided. The process comprising contacting a treated solid oxide compound, an organometal compound, and an organoaluminum compound in the presence of an alpha...
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6664352 |
Supported polymerization catalysts
The invention provides a process for the preparation of a supported polymerization catalyst, said process comprising impregnating a porous particulate support in a mechanically fluidized state with...
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6664351 |
Ethylene copolymers, process for the preparation of ethylene-based polymers and catalyst system used therein
Ethylene copolymers are prepared with comonomers selected from: (a) α-olefins, (b) cycloolefins and (c) polyenes, with a content of ethylene units of between 80 and 99 mol %, a content of units...
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6660816 |
Process for preparing olefin polymers
A method for producing an olefin polymer, characterized in that an olefin is homopolymerized or copolymerized in the presence of a catalyst for olefin polymerization, having the following (A) and...
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6660815 |
Method for preparing a supported catalyst system and its use in a polymerization process
The present invention relates to a composition of carboxylate metal salt and a flow improver useful in combination with a polymerization catalyst to improve the flowability and bulk density of the...
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6653430 |
Butadiene polymers and process for producing conjugated diene polymers
A butadiene polymer (i) having a cis bond unit content of at least 50% based on the total butadiene units, a number average molecular weight (Mn) of 1,000 to 10,000,000, and at least 80%, based on...
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6653416 |
Polymerization process utilizing organometal catalyst compositions and the polymer produced thereby
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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6653431 |
Low density polyolefin
Use of a catalyst system comprising a metallocene catalyst component of general formula R″ (CpR n )(Cp′R′ n )MQ 2 supported on an inert support in the slurry phase production of linear low...
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6649713 |
Process for preparation of polyolefin/inorganic component nanocomposite by in-situ polymerization
The present invention relates to a process for preparation of polyolefin/inorganic component nanocomposite by in-situ polymerization, in which, a clay is first organically modified and then silica...
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6649712 |
Process for the polymerization of alpha olefins
The present invention provides a method for varying the melting points and molecular weights of polyolefins by changing the structure of the catalyst used in the polymerization. The catalysts that...
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6642400 |
Linked metallocene complexes, catalyst systems, and olefin polymerization processes using same
Disclosed are metallocene complexes containing two or more metallocene components where the components may be independently bridged or unbridged. In particular, the invention provides metallocene...
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6642326 |
Use of silanes to enhance activity in single-site polymerizations
A process for the polymerization of olefins is disclosed. A boraaryl catalyst precursor and an activator are used in the presence of a silane modifier. A low level of silane modifier enhances the...
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6642340 |
Process for preparing an ethylene/α-olefin copolymer
A process for preparing an ethylene/α-olefin copolymer, which includes the steps of (A) copolymerizing ethylene and an α-olefin of 3 to 20 carbon atoms by continuous vapor phase polymerization;...
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6639030 |
Process for production of olefin polymer
A process for production of an olefin polymer is provided which comprises polymerization of ethylene and/or α-olefin of three of more carbons at a polymerization temperature of not lower than...
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6635779 |
Metallocene compounds, process for their preparation and their use in catalytic systems for the polymerization of olefins
A class of metallocene compounds is disclosed having general formula (I) wherein Y is a moiety of formula (II) wherein A, B, and D, same or different from each other, are selected from an element...
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6635597 |
Perfluoronaphthyl substituted boron containing catalyst activator
A catalyst activator particularly adapted for use in the activation of metal complexes of metals of Group 3-10 for polymerization of ethylenically unsaturated polymerizable monomers, especially...
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6635733 |
Elastomeric polypropylene
An elastomeric polypropylene wherein (a) an isotactic pentad (I 5 ) is 0.150-0.749, (b) a different bond due to a 2,1-insertion reaction is 0.11-20 mol %, (c) a different bond due to a...
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6635727 |
Ethylene copolymer rubber, process for producing the same, and use
The ethylenic copolymer rubber according to the present invention is a novel and useful ethylenic copolymer rubber which can be cross-linked at a high velocity and is superior in scorching...
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6632911 |
Ethylene/α-olefin copolymer and film made thereof
An ethylene/α-olefin copolymer having a density of 0.900 to 0.965 g/cm 3 ; having an MI of 0.01 to 100 g/10 minutes; in a chromatogram with the use of Rayleigh ratio obtained by extrapolating...
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6632901 |
Polymerization process using an improved bulky ligand metallocene-type catalyst system
The present invention relates to a polymerization process in the presence of a bulky ligand metallocene-type catalyst compound having an abstractable fluoride or fluorine containing leaving group.
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6632769 |
Catalyst modifier and its use in the polymerization of olefin(s)
The present invention relates to the use of at least one solid compound that when used with a polymerization catalyst in a polymerization process results in a phase change of the solid compound to...
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6630547 |
Use of silanes to control molecular weight in olefin polymerizations
A process for polymerizing an olefin is disclosed. The olefin is polymerized with a catalyst precursor in the presence of an activator and an organosilane modifier. Use of the organosilane...
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6630545 |
Polymerization process
An improved catalyst composition for addition polymerizations comprising: (A) a Group 4 metal complex the includes an anionic, polycyclic, fused ring ligand system containing at least 4 fused...
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6630546 |
Process for the preparation of a polyolefin
Use of a catalyst system comprising a metallocene catalyst component of general formula R″(CpR m ) (Cp′R′ n )MQ 2 supported on an inert support in the slurry phase production of linear low...
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6630549 |
Method for producing an olefin homopolymer or an olefin copolymer
A method for producing an olefin homopolymer or an olefin copolymer from an olefin or an olefin and at least one comonomer copolymerizable therewith by continuous slurry polymerization or...
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6630550 |
Olefin polymerization catalyst
A catalyst for olefin polymerization of the formula: R″(C 4 R′ m C 5 C 4 R′ n )XMeQ wherein X is an hetero atom ligand with one or two lone pair electrons selected from the elements of Group...
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6627714 |
Method for producing an olefin type copolymer having a cyclic structure
An olefinic copolymer having a cyclic structure is prepared by copolymerizing a) ethylene (M1) and b) dicyclopentadiene or tricyclopentadiene (M2), and, optionally c) a cyclic olefin (M3), in the...
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6624266 |
Compositions and methods of using preactivated unsupported catalyst compositions having a given concentration
Preactivated unsupported catalyst compositions methods of using them are disclosed whereby the compositions have a concentration of preactivated catalyst of at least about 0.04 mmol of preactivated...
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6620953 |
Method for producing monoaryloxy-ansa-metallocenes
The present invention relates to a process for preparing monoaryloxy-metallocenes of the formula (II), which comprises reacting a ligand starting compound of the formula (III) with a transition...
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6620757 |
Catalyst systems and their use in a polymerization process
The present invention relates to mixed catalyst system of a Group 15 containing metal catalyst compound, a bulky ligand metallocene-type catalyst compound, and a Lewis acid aluminum containing...
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6617277 |
Supported metallocene catalyst system for olefin polymerization
A catalyst composition has a catalyst component which includes a metallocene transition metal compound, a magnesium compound, a hydroxyl containing compound, and a polymeric material. The catalyst...
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6617407 |
Bis(n,n-dihydrocarbylamino)-substituted cyclopentadienes and metal complexes thereof
This invention relates to bis(N,N-dihydrocarbylamino)-substituted derivatives of cyclopentadienes (Cp) and metal complexes thereof which find utility as olefin polymerization catalyst components.
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6617405 |
Process for the preparation of polyethylene
A process of polymerizing ethylene or ethylene and one or more comonomers in one or more fluidized bed reactors with a catalyst system comprising (i) a supported or unsupported magnesium/titanium...
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6617410 |
Propylene copolymers containing styrene units
Isotactic-polypropylene-based copolymers having a homogenous distribution of recurring units of formula (1): where R is a hydrogen, halide radical or a hydrocarbyl radical optionally containing...
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6617466 |
Monocylopentadienyl transition metal olefin polymerization catalysts
The invention is a catalyst system including a Group IV B transition metal component and an alumoxane component which may be employed to polymerize olefins to produce a high molecular weight polymer.
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6613713 |
Organometallic compounds with fused indenyl ligands
The present invention relates to transition metal organometallic compounds with an indenyl ligand attached in position 2 and fused in position 5,6, to a process for the production thereof and to...
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6613851 |
Catalyst for the polymerization of olefins
The invention relates to the use of cyclic carbene-η-ligand complexes for catalysis of olefin polymerization.
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6610803 |
Catalyst composition and methods for its preparation and use in a polymerization process
The present invention relates to a catalyst composition and a method for making the catalyst composition of a polymerization catalyst and a carbonyl compound. The invention is also directed to the...
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6610627 |
Catalyst for the production of olefin polymers
A catalyst precursor having the formula: A q ML n wherein each A has the formula: M is a metal selected from the group consisting of Group elements; each L is a monovalent, bivalent, or trivalent...
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6605676 |
Process for obtaining polyolefins with broad bimodal or multimodal molecular weight distributions
The process is characterized by the use of catalyst systems consisting of a single metallocene catalyst activated with mixtures of at least 2 co-catalysts. The co-catalysts are aluminium alkyls,...
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6596890 |
Aluminum alkyl complexes as cocatalysts
Organometallic aluminum compounds of the general formula (I) where X 1 is NH, NH 2 *, NH—A*, N—A, N(A) 2 *, O, OA*, O-Aryl*, S, SA*, P, P(A) 2 * or a single bond, X 2 is NH, N—A, O, S,...
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6596828 |
Catalyst composition
A catalyst composition for polymerization of a conjugated diene or copolymerization of a conjugated diene and an aromatic vinyl compound, which comprises the following components: (A) a...
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6596826 |
Olefin polymerization catalysts containing 1,3-diboretanyl ligands
An olefin polymerization catalyst system and method of making it are disclosed. The catalyst system comprises an activator and an organometallic complex. The complex comprises a Group 3 to 10...
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6596891 |
Activating composition of metallocene complexes in the catalysis of (co)polymerization processes of olefins
An organometallic composition of a reaction product of a fluorinated organic compound of formula (I): wherein R 1 to R 8 are as described in the specification, m is 0 or 1; and an...
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6590114 |
Conversion of cyclopentadienyl silyl amines to organometallic complexes comprising titanium bisalkoxy moiety or titanium dichloride moiety
Conversion of cyclopentadienyl or indenyl compounds to titanium organometallic complexes by treatment with titanium tetraalkoxides is described.
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6586541 |
Process for production of polyolefins
Polyolefins, especially branched polyethylenes, can be made by combining a catalyst that can oligomerize ethylene to one or more alpha-olefins and a polymerization catalyst which can copolymerize...
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