Class / Patent application number | Description | Number of patent applications / Date published |
526134000 | Boron compound contains boron bonded to hydrogen or to carbon atom | 30 |
20080269441 | Polymerization process providing polyethylene of enhanced optical properties - A process for the polymerization of ethylene to provide an ethylene polymer of reduced Yellowness Index. A feed stream, comprising an inert hydrocarbon diluent containing ethylene in a minor amount, is supplied to a polymerization reactor. A chromium-based polymerization catalyst and a triethylboron co-catalyst are incorporated into the feed stream within the reactor. The polymerization catalyst will normally be used in an amount within the range of 0.008-0.1 wt. % of the diluent in the feed stream and the triethylboron co-catalyst is incorporated in an amount within the range of 0.1-50 ppm of the diluent. The polymer fluff from the reactor is heated to a temperature sufficient to melt the fluff which is then extruded to produce a polymer product. The Yellowness Index after high temperature aging is at least 5% less than the corresponding Yellowness Index of a corresponding polymer product produced without the triethylboron co-catalyst. | 10-30-2008 |
20080269442 | CATIONIC PERAMIDO TITANIUM POLYMERIZATION CATALYSTS - The presently disclosed subject matter relates to tris(N,N-diarylamido) transition metal complexes and the use of such complexes as single-site polymerization catalysts. The presently disclosed complexes can be used as catalysts in the preparation of polymers from monomers, such as olefins and propylene oxide, at relatively low pressure and temperature. The polymers produced have a high molecular weight. | 10-30-2008 |
20090209712 | TRANSITION METAL COMPLEXES, CATALYST COMPOSITIONS CONTAINING THE SAME, AND OLEFIN POLYMERIZATION USING THE CATALYST COMPOSITIONS - Provided are a novel transition metal complex where a monocyclopentadienyl ligand to which an amido or alcoxy group is introduced is coordinated, a method of synthesizing the same, and olefin polymerization using the transition metal complex. Compared to a conventional transition metal complex having a silicon bridge and an oxido ligand, the transition metal complex has a phenylene bridge, so that a monomer easily approaches the transition metal complex in terms of structure and a pentagon ring structure of the transition metal complex is stably maintained. The catalyst composition including the transition metal complex is used to synthesize a polyolefin copolymer having a very low density less than 0.910 g/cc. | 08-20-2009 |
20100004412 | METHOD FOR PREPARING POLYMER BY PRECIPITATION POLYMERIZATION - The present invention provides a method for preparing a polymer by precipitation polymerization, comprising the steps of mixing an antisolvent a), a monomer b), and a catalyst c), and while polymerizing the monomers, simultaneously precipitating a polymer formed by the monomers b) in a solid phase. | 01-07-2010 |
20100016527 | TETHERED SUPPORTED TRANSITION METAL COMPLEX - A supported metal complex comprising the reaction product of a transition metal complex of a polyvalent heteroaryl donor ligand containing at least one ortho-metallated aromatic ligand group and an ethylenically or poly(ethylenically) functionalized particulated organic or inorganic solid, a method for preparing the same and the use thereof as an addition polymerization catalyst. | 01-21-2010 |
20100022725 | Borohydride Metallocene Complex of a Lanthanide, Catalytic System Including Said Complex, Polymerization Method Using Same and Ethylene/Butadiene Copolymer Obtained Using Said Method - The present invention relates to a borohydride metallocene complex of a lanthanide, to its process of preparation, to a catalytic system incorporating it, to a process for the copolymerization of olefins employing this catalytic system and to an ethylene/butadiene copolymer obtained by this process, the butadiene units of which comprise 1,2-cyclohexane or 1,2- and 1,4-cyclohexane links. | 01-28-2010 |
20100029873 | Catalyst System And Process For Olefin Polymerization - The present application relates to a new catalyst system for the polymerization of olefins, comprising a new ionic activator having the formula: [R | 02-04-2010 |
20100113719 | OLEFIN METATHESIS PROCESS EMPLOYING BIMETALLIC RUTHENIUM COMPLEX WITH BRIDGING HYDRIDO LIGANDS - An olefin metathesis process for converting a reactant olefin or a mixture of reactant olefins into one or more product olefins that are different from the reactant olefin(s). The process employs a catalyst system containing a carbene-generating agent and a bimetallic ruthenium complex comprising one or more μ-hydrido bridging ligands, and optionally containing di(t-butyl)phosphine. The catalyst system is advantageously active at process temperatures greater than 90° C. Cyclization metathesis and ring-opening polymerization metathesis are preferred olefin metathesis processes. | 05-06-2010 |
20100113720 | METHOD FOR PREPARING ELASTOMERIC COPOLYMERS OF ETHYLENE AND ALPHA-OLEFINS - Provided is a process for preparing copolymers of ethylene with α-olefin. More specifically, provided are transition metal compound being useful as catalyst for preparing those copolymers, a catalyst composition comprising the same, and a process for preparing elastic copolymers of ethylene with α-olefin, having the density of not more than 0.910, which can be adopted to a wide variety of applications including film, electric wires, and hot-melt adhesives. The catalyst composition is a catalytic system which comprises transition metal catalyst comprising a cyclopentadiene derivative and at least one anionic ligand(s) of aryloxy group with an aryl derivative at ortho-position, and boron or aluminum compound as an activator. Provided is a process for copolymerizing ethylene with α-olefin to produce copolymer having narrow molecular weight distribution and uniform density distribution with the density of not more than 0.910, with high activity and excellent reactivity on higher α-olefin. | 05-06-2010 |
20100204420 | TRANSITION METAL ION COMPLEX, METHOD FOR PRODUCING THE SAME, AND METHOD FOR PRODUCING POLYMER - A transition metal ion complex represented by formula (1): | 08-12-2010 |
20100286349 | NOVEL COMPLEXES AND METHOD FOR SYNTHESIS OF GROUP 4 ORGANOMETALLICS GRAFTED ON ANIONS OLEFIN OLIGOMERIZATION AND POLYMERIZATION METHOD - Novel group 4 organometallic compounds, supported on anions by means of at least one covalent metal-oxygen bond, are obtained by reaction of at least one borate or aluminium comprising at least one hydroxy group with at least one group 4 transition metal compound. These compounds are used in a catalytic composition implemented in an olefin oligomerization or polymerization method. | 11-11-2010 |
20100292422 | METHOD FOR PRODUCING COPOLYMERS MADE FROM ISOBUTENE AND AT LEAST ONE VINYLAROMATIC COMPONENT - The invention relates to a method for producing copolymers made from isobutene and at least one vinylaromatic component. Said method consists of polymerising isobutene or a hydrocarbon mixture containing isobutene with at least one vinylaromatic compound in the presence of a solvent-stable transistion metal complex comprising slightly co-ordinating anions as a polymerisation catalyst. The invention also relates to copolymers made of isobutene and at least one vinylaromatic compound, which can be obtained by means of said inventive method, in addition to specific functionalisation products therefrom. | 11-18-2010 |
20110098427 | Catalyst Compounds And Use Thereof - Group 4 catalyst compounds containing di-anionic tridentate nitrogen/oxygen based ligands are provided. The catalyst compounds are useful, with or without activators, to polymerize olefins, particularly α-olefins, or other unsaturated monomers. Systems and processes to oligomerize and/or polymerize one or more unsaturated monomers using the catalyst compound, as well as the oligomers and/or polymers produced therefrom are also provided. | 04-28-2011 |
20110130532 | NOVEL COMPOUNDS, CATALYST COMPOSITION COMPRISING THE SAME, AND METHOD FOR PREPARING OF CYCLOOLEFIN-BASED POLYMER USING THE SAME - The present invention relates to a novel metallocene compound, a catalyst composition including the compound and an olefin polymer prepared using the same. The metallocene compound and the catalyst composition can be used for preparing the olefin polymer with high copolymerization degree and high molecular weight. Particularly, the block copolymer with high heat resistance can be prepared by using the metallocene compound, and the olefin polymer with high melting point (Tm) can be obtained, even if co-monomer is used at an increased amount in preparation of olefin polymer. | 06-02-2011 |
20110282014 | NORBORNENE COPOLYMER AND PRODUCTION METHOD THEREOF - The invention relates to a norbornene copolymer having excellent properties such as transparency, heat resistance, low water absorption and electric insulating property, which copolymer comprises a monomer unit represented by formula (1) and formula (2) | 11-17-2011 |
20120123071 | PROCESS FOR THE PRODUCTION OF AN ETHYLENE POLYMER USING A CHROMIUM CONTAINING CATALYST - The invention is directed to a process for the production of high density polyethylene by polymerisation of ethylene in the presence of a supported chromium oxide based catalyst and an activator characterised in that the activator comprises the reaction mixture of a boron compound and/or an alkyl aluminium compound and a nitrogen containing compound wherein the boron compound is a (C | 05-17-2012 |
20120245313 | ENHANCED CATALYST PERFORMANCE FOR PRODUCTION OF VINYL TERMINATED PROPYLENE AND ETHYLENE/PROPYLENE MACROMERS - This invention relates to a transition metal catalyst compound represented by the structure: | 09-27-2012 |
20130085246 | OLEFIN-BASED POLYMER AND PREPARATION METHOD THEREOF - The present invention relates to an olefin-based polymer which exhibits superior processability and superior adhesive properties and therefore is desirably applicable to a hot-melt adhesive (HMA) or the like, and a preparation method thereof. The olefin-based polymer has a molecular weight distribution (Mw/Mn, PDI) of 2˜3, and a density of 0.85 to 0.88 g/cm | 04-04-2013 |
20130096269 | ETHYLENE-BASED TERPOLYMER HAVING HIGH ELASTICITY AND PREPARATION METHOD THEREOF - The present invention relates to an ethylene-based terpolymer having high elasticity and a preparation method thereof, and more particularly, to a highly elastic, ethylene-based terpolymer, which comprises a specific molar ratio of a ethylene unit, a C | 04-18-2013 |
20130203949 | GROUP 4 METAL COMPOUND CONTAINING THIOPHENE-FUSED CYCLOPENTADIENYL LIGAND DERIVED FROM TETRAQUINOLINE DERIVATIVE AND OLEFIN POLYMERIZATION USING THE SAME - The present invention relates to a novel ligand derived from a tetrahydroquinoline derivative, and a transition metal compound prepared using the ligand, where an amido ligand is linked to an ortho-phenylene ligand to form a condensed ring and a 5-membered cyclic pi-ligand linked to the ortho-phenylene ligand is fused with a heterocyclic thiophene ligand. Compared with the catalysts not fused with a heterocyclic thiophene ligand, the transition metal compound of the present invention as activated with a co-catalyst has higher catalytic activity in olefin polymerization and provides a polymer with higher molecular weight. | 08-08-2013 |
20130317187 | LONG CHAIN-BRANCHED ETHYLENE-ALPHA OLEFIN COPOLYMER - The present invention relates to an ethylene-alpha olefin copolymer comprising long chain branches (LCB), while having a narrow molecular weight distribution. The ethylene-alpha olefin copolymer can be prepared by a continuous solution polymerization process using an activated catalyst composition containing a Group 4 transition metal compound having a monocyclopentadienyl ligand, to which a quinoline amino group is introduced. | 11-28-2013 |
20140221586 | Methods for Stereoselective Coordinative Chain Transfer Polymerization of Olefins - The present invention provides a method of producing a polyolefin composition comprising contacting a binuclear metallocene pre-catalyst and a co-catalyst, adding a excess of a metal alkyl, then adding a first olefin monomer. The method allows for the production of polyolefins with a highly stereoregular stereochemical micrsostructure through living coordination polymerization in which rapid reversible chain transfer between a racemic mixture of a chiral active transition metal propagating center and multiple equivalents of inert main group metal alkyl is competitive with chain-growth propagation at the active center. By virtue of the slower rate of chain-transfer relative to propagation that can be achieved with a binuclear catalyst relative to the corresponding mononuclear catalyst, the present invention provides a work-around solution to the intrinsic limitation on product volume imposed by a traditional living polymerization, as well as a work-around solution to the stereochemically random microstructure that is normally obtained as the result of rapid and reversible chain-transfer between two populations of chiral active propagating centers, of opposite absolute configuration, when a racemic mixture of the pre-catalyst is employed. In essence, the field of invention is defined as stereoselective living coordinative chain-transfer polymerization. | 08-07-2014 |
20140221587 | Process for Controlling Molecular Weight of Polyolefins Prepared Using Pyridyl Diamide Catalyst Systems - Pyridyldiamido transition metal complexes are disclosed for use in alkene polymerization to produce polyolefins. | 08-07-2014 |
20150141598 | Boron-Bridged Metallocene Catalyst Systems and Polymers Produced Therefrom - Disclosed herein are catalyst compositions containing boron bridged, cyclopentadienyl-indenyl metallocene compounds with an alkenyl substituent. These catalyst compositions can be used for the polymerization of olefins. For example, ethylene homopolymers produced using these catalyst compositions can be characterized by a density less than 0.97 g/cm | 05-21-2015 |
20150141599 | Catalyst Systems Containing Boron-Bridged Cyclopentadienyl-Fluorenyl Metallocene Compounds With An Alkenyl Substituent - Disclosed herein are catalyst compositions containing boron-bridged, cyclopentadienyl-fluorenyl metallocene compounds with an alkenyl substituent. These catalyst compositions can be used for the polymerization of olefins. For example, ethylene copolymers produced using these catalyst compositions can be characterized by a combination of a flat or a conventional comonomer distribution and low levels of long chain branching. | 05-21-2015 |
20160115263 | Ethylene-Propylene Copolymeric Compositions With Long Methylene Sequence Lengths - This invention relates to methods to prepare and compositions pertaining to branched ethylene-propylene copolymers that include at least 50% ethylene content by weight as determined by FTIR; a g′ | 04-28-2016 |
20160177008 | FUNCTIONALIZED ELASTOMER | 06-23-2016 |
20160251458 | PROCESS FOR THE PREPARATION OF (CO)POLYMERS OF CONJUGATED DIENES IN THE PRESENCE OF A CATALYTIC SYSTEM COMPRISING AN OXO-NITROGENATED COMPLEX OF COBALT | 09-01-2016 |
20160251464 | ETHYLENE-BASED QUATERPOLYMER HAVING LOW GLASS TRANSITION TEMPERATURE AND PREPARATION METHOD THEREOF | 09-01-2016 |
20220135831 | POLYCYCLIC-OLEFINIC COMPOSITIONS FOR LOW-LOSS FILMS HAVING IMPROVED THERMAL PROPERTIES - Embodiments in accordance with the present invention encompass compositions containing one or more polycycloolefinic monomers and at least one multifunctional olefinic monomer which when subjected to a suitable temperature undergoes mass polymerization to provide a three-dimensional insulating article which exhibits hitherto unattainable low dielectric constant and low-loss properties, and very high thermal properties. The compositions of this invention may additionally contain one or more organic or inorganic filler materials, which provide improved thermo-mechanical properties in addition to very low dielectric properties. The compositions are stable at room temperature and undergo mass polymerization only when subjected to suitable higher temperatures generally above 100° C. The compositions of this invention are useful in various applications, including as insulating materials in millimeter wave radar antennas, among others. | 05-05-2022 |