Adding Polymerization Inhibitor Or Terminator, E.g., Short-stopper, Etc. Patents (Class 526/82)
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Patent number: 6867270Abstract: The present invention is a process for transitioning from a first polymerization reaction to a second polymerization reaction incompatible with the first polymerization reaction in a gas-phase reactor. The novel process comprises conducting multiple polymerization reactions, capturing and storing a substantially contaminant-free polymerization product from each multiple polymerization reaction for use as a selected substantially contaminant-free seedbed in a second polymerization, wherein the polymerization product from each multiple polymerization reaction is rendered substantially contaminant-free by stripping or venting reactants and contaminants and is maintained as substantially contaminant-free by storage under an inert atmosphere.Type: GrantFiled: November 24, 2003Date of Patent: March 15, 2005Assignee: Univation Technologies, LLCInventors: Bruce Jon Savatsky, Kelli Lynne Tilston, Thomas Redden Veariel
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Patent number: 6841630Abstract: Processes for transitioning among polymerization catalyst systems, preferably catalyst systems, which are incompatible with each other. Particularly, processes for transitioning among olefin polymerization reactions utilizing silyl-chromate catalyst systems and metallocene catalyst systems.Type: GrantFiled: November 17, 2003Date of Patent: January 11, 2005Assignee: Univation Technologies, LLCInventors: Kersten Anne Terry, Mark Gregory Goode, Daniel E. Wente, John Chirillo, Jr., Simon Mawson, Jose Fernando Cevallos-Candau
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Patent number: 6838532Abstract: The present invention is a process for transitioning from a first polymerization catalyst system to a second polymerization catalyst system incompatible with the first polymerization catalyst system in a gas-phase reactor. The novel process comprises conducting a first polymerization reaction using a first polymerization catalyst system; stopping the first polymerization reaction; removing the contents of the first polymerization reaction from the reactor while maintaining a substantially closed system; then, in the substantially closed system, introducing a substantially contaminant free seedbed into the reactor; introducing a second feed system and a second catalyst system into the reactor; and conducting a second polymerization reaction.Type: GrantFiled: October 10, 2003Date of Patent: January 4, 2005Assignee: ExxonMobil Chemical Patents Inc.Inventors: Thomas Redden Veariel, George Varcelia Yenetchi, Sandy Clay Hinds, Diwalker Singh, Thierry Polchlopek
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Patent number: 6833416Abstract: A method of transitioning catalysts for polyolefin polymerization is provided. In one aspect, the process includes providing a polymerization reactor that includes a first catalyst system, contacting olefin monomers with the first catalyst system to form polyolefin in a first polymerization reaction and introducing a catalyst killer to the polymerization reactor in an amount sufficient to terminate the first polymerization reaction. The method further includes introducing a second catalyst system to the polymerization reactor in the presence of at least a portion of the catalyst killer, wherein the at least a portion of the catalyst killer is an amount sufficient to activate the second catalyst system and contacting olefin monomers with the second catalyst system to form polyolefin in a second polymerization reaction.Type: GrantFiled: February 27, 2004Date of Patent: December 21, 2004Assignee: Univation Technologies, LLCInventors: Michael Allen Kinnan, Fred David Ehrman, Pradeep Pandurang Shirodkar, Mark Bradley Davis, Michele Lynn Grief-Rust
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Patent number: 6833417Abstract: A process of transitioning from a first polymerization reaction conducted in the presence of a mixed catalyst system to a second polymerization reaction conducted in the presence of a chrome-based catalyst system is disclosed, the polymerization reactions being conducted in one embodiment in a polymerization zone of a gas phase fluidized bed reactor which contains a fluidized bed of polymer particles by the essentially continuous passage of monomer gases through the polymerization zone, comprising: a) discontinuing the introduction of the mixed catalyst system into the reactor; b) maintaining polymerization conditions in the reactor and permitting polymerization to continue for a period of time to allow the components of the mixed catalyst system present in the reactor to produce additional polymer particles; c) introducing a deactivating agent into the fluidized bed in an amount sufficient to deactivate the mixed catalyst system; d) establishing optimal conditions within the reactor for the chrome-basedType: GrantFiled: April 29, 2004Date of Patent: December 21, 2004Assignee: Univation Technologies, LLCInventors: Fred David Ehrman, Mark Bradley Davis, Ronald Steven Eisinger, Mark Gregory Goode, Michael Allen Kinnan
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Publication number: 20040225087Abstract: Apparatus for olefin polymerization includes a plurality of shell and tube olefin polymerization reactors, each of which has an olefin polymerization reaction mixture inlet connection and a crude polyolefin product outlet connection. Each reactor is equipped with a recirculation system including a pump arranged to circulate a reaction mixture through the tube side of the reactor independently of the introduction of olefin polymerization reaction mixture into the reactor. The apparatus also includes an inlet reaction mixture distribution manifold and an outlet polymerization reaction mixture collection manifold interconnecting the reactors for operation in parallel. The apparatus also includes catalyst composition and catalyst modifier inlets for each reactor arranged such that a catalyst modifier to may be introduced into each reactor at a rate which is independent of the introduction of catalyst composition.Type: ApplicationFiled: May 9, 2003Publication date: November 11, 2004Inventors: C. Edward Baxter, Daniel Herndon, James G. Wakeland, Russel E. Reid, Gilbert Valdez
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Publication number: 20040214969Abstract: A process of transitioning from a first polymerization reaction conducted in the presence of a mixed catalyst system comprising to a second polymerization reaction conducted in the presence of a chrome-based catalyst system is disclosed, the polymerization reactions being conducted in one embodiment in a polymerization zone of a gas phase fluidized bed reactor which contains a fluidized bed of polymer particles by the essentially continuous passage of monomer gases through the polymerization zone, comprising:Type: ApplicationFiled: April 29, 2004Publication date: October 28, 2004Inventors: Fred David Ehrman, Mark Bradley Davis, Ronald Steven Eisinger, Mark Gregory Goode, Michael Allen Kinnan
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Publication number: 20040186250Abstract: A method of transitioning catalysts for polyolefin polymerization is provided. In one aspect, the process includes providing a polymerization reactor that includes a first catalyst system, contacting olefin monomers with the first catalyst system to form polyolefin in a first polymerization reaction and introducing a catalyst killer to the polymerization reactor in an amount sufficient to terminate the first polymerization reaction. The method further includes introducing a second catalyst system to the polymerization reactor in the presence of at least a portion of the catalyst killer, wherein the at least a portion of the catalyst killer is an amount sufficient to activate the second catalyst system and contacting olefin monomers with the second catalyst system to form polyolefin in a second polymerization reaction.Type: ApplicationFiled: February 27, 2004Publication date: September 23, 2004Inventors: Michael Allen Kinnan, Fred David Ehrman, Pradeep Pandurang Shirodkar, Mark Bradley Davis, Michele Lynn Grief-Rust
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Patent number: 6794466Abstract: The present invention elates to a vinyl acetate based polymer latex composition obtained by emulsion polymerization of: (a) polyvinyl alcohol, (c) a monomer mixture comprising vinyl acetate, and (d) optionally one or more additional co-monomer(s), in presence of (c) 0.0001-0.05 wt. % of a chain transfer agent, based on total monomer weight, said vinyl acetate based polymer latex composition having a weight average particle size ≧400 nm and a higher shear thinning factor than the vinyl acetate based polymer latex composition (a), (b) and (d) obtained in the absence of the chain transfer agent (c). According to one embodiment, emulsion polymerization is carried out in presence of 0.001 to 0.05 wt. % of a chain transfer agent selected from the group consisting of aldehydes and chain transfer agents having a similar chain transfer constant with regard to vinyl acetate as the monomer. According to another embodiment, emulsion polymerization is carried out in presence of 0.0001 to 0.01 wt.Type: GrantFiled: October 19, 2001Date of Patent: September 21, 2004Assignee: Air Products Polymers, L.P.Inventors: Helmut Zecha, Rudolf Weissgerber, Francis Petrocelli
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Publication number: 20040181016Abstract: Processes for transitioning among polymerization catalyst systems, preferably catalyst systems that are incompatible with each other. In particular, the processes relate to transitioning from olefin polymerizations utilizing metallocene catalyst systems to olefin polymerizations utilizing traditional Ziegler-Natta catalyst systems.Type: ApplicationFiled: November 18, 2003Publication date: September 16, 2004Inventors: Agapios Kyriacos Agapiou, Robert Olds Hagerty, F. David Hussein, Michael Elroy Muhle, Richard B. Pannell, Kathryn Ann Russell, Robert Lynn Santana, X. Simon Zhang
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Publication number: 20040171772Abstract: Homo- and copolymers of isobutene are prepared by continuous cationic polymerization of isobutene or mixtures of isobutene with ethylenically unsaturated comonomers in the presence of an initiator system comprising:Type: ApplicationFiled: November 5, 2003Publication date: September 2, 2004Inventors: Stephan Huffer, Hans Peter Rath, Gabriele Lang, Jens Kremeskotter, Elmar Stockelmann
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Patent number: 6784262Abstract: Processes for chemically-modifying the surface of an emulsion polymer particle are provided which include providing an aqueous emulsion polymer, a monomer at a level of at least 0.5% by weight based on the weight of the emulsion polymer and a, surface-modifying chemical capable of bonding with the monomer, under conditions where there is no substantial polymerization of the monomer, and then reducing the level of the monomer by at least 50%.Type: GrantFiled: September 25, 2001Date of Patent: August 31, 2004Assignee: Rohm and Haas CompanyInventor: Robert Mitchell Blankenship
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Publication number: 20040167299Abstract: The present invention is a process for transitioning from a first polymerization reaction to a second polymerization reaction incompatible with the first polymerization reaction in a gas-phase reactor. The novel process comprises conducting multiple polymerization reactions, capturing and storing a substantially contaminant-free polymerization product from each multiple polymerization reaction for use as a selected substantially contaminant-free seedbed in a second polymerization, wherein the polymerization product from each multiple polymerization reaction is rendered substantially contaminant-free by stripping or venting reactants and contaminants and is maintained as substantially contaminant-free by storage under an inert atmosphere.Type: ApplicationFiled: November 24, 2003Publication date: August 26, 2004Inventors: Bruce Jon Savatsky, Kelli Lynne Tilston, Thomas Redden Veariel
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Publication number: 20040151642Abstract: A process is provided that produces polyolefins. The process comprises mixing a first stream, which comprises at least one catalyst deactivating agent, with a second stream, which comprises at least one polyolefin, at least one catalyst, at least one diluent, and at least one monomer, to produce a third stream, which comprises at least one polyolefin, at least one deactivated catalyst, at least one diluent, and at least one monomer. By utilizing the deactivating agent, polymerization can be slowed, or substantially stopped, when downstream equipment is being repaired or process control problems are being corrected. Later, polymerization can be restarted without the use of scavengers to remove poisons from the slurry polymerization reactor, and polyolefin production can be resumed.Type: ApplicationFiled: November 18, 2003Publication date: August 5, 2004Inventors: David H. Burns, Donald W. Verser, John D. Hottovy, Michael C. Carter, Robert W. Bohmer
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Patent number: 6767974Abstract: A process including: heating to a first polymerization temperature a first mixture composed of a first free radical polymerizable monomer, a first free radical initiator, and a first stable free radical compound to polymerize only a portion of the first monomer, resulting in a prepolymer composition; shearing a second mixture including the prepolymer composition, a continuous phase liquid, and a stabilizing compound to create a miniemulsion; and heating to a second polymerization temperature the miniemulsion to form polymeric particles, wherein there is added to the second mixture, the miniemulsion, or both the second mixture and the miniemulsion at any time prior to the formation of the polymeric particles a second free radical initiator, a second free radical polymerizable monomer, and an optional second stable free radical compound, wherein at least one of the second initiator and the second monomer includes a functional group, wherein the polymeric particles each includes a compound with the functionalType: GrantFiled: February 3, 2003Date of Patent: July 27, 2004Assignee: Xerox CorporationInventors: Barkev Keoshkerian, Thomas E. Enright
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Patent number: 6767960Abstract: The present invention is to provide a continuous anion polymerization method for preparing transparent high impact vinyl aromatic polymer comprising the steps of: i) charging and polymerizing vinyl aromatic monomers and initiator to obtain vinyl aromatic polymer in the presence of solvent and polar organic compounds in the first reactor (1a); ii) continuously charging and polymerizing vinyl aromatic monomers and conjugated diene monomers to the vinyl aromatic polymer obtained in the first reactor to obtain tapered vinyl aromatic polymer chain in the presence of organic solvent in the second reactor (1b); iii) continuously charging and polymerizing vinyl aromatic monomers and multi-functional compounds to the vinyl aromatic polymer chain obtained in the second reactor to obtain high impact vinyl aromatic polymer in the presence of organic solvent in the third reactor (1c); and iv) terminating the reaction with terminator and removing the remaining hydrocarbon solvent and unreacted monomers to obtain transparenType: GrantFiled: December 17, 2002Date of Patent: July 27, 2004Assignee: Korea Kumho Petrochemical Co., Ltd.Inventors: Jong-Hyun Bae, Jong-Hyun Park, Jong-Geun Kim, Dai-Seung Choi, Sam-Min Kim
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Publication number: 20040143076Abstract: Processes for transitioning among polymerization catalyst systems, preferably catalyst systems, which are incompatible with each other. Particularly, processes for transitioning among olefin polymerization reactions utilizing silyl-chromate catalyst systems and metallocene catalyst systems.Type: ApplicationFiled: November 17, 2003Publication date: July 22, 2004Inventors: Kersten Anne Terry, Mark Gregory Goode, Daniel E. Wente, John Chirillo, Simon Mawson, Jose Fernando Cevallos-Candau
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Publication number: 20040132930Abstract: The invention concerns a method of polymerization in aqueous suspension of vinyl chloride alone or mixed with another vinyl monomer, wherein the initiator comprises at least a compound selected from dialkyl peroxydicarbonates, peroxy-tert-alkanoates and diacyl peroxides, and it consists in using, as short-stopper of the polymerization, a stable free nitroxyl radical. The resulting resins have good whiteness.Type: ApplicationFiled: October 2, 2003Publication date: July 8, 2004Inventors: Christian Bonardi, Jean-Luc Couturier, Sandra Grimaldi, Olivier Guerret, Jacques Kervennal, Pierre Hebrard, Bouchra Taha
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Publication number: 20040132916Abstract: The present invention relates to a process for polymer hydrogenation that includes: polymerizing or copolymerizing at least one conjugated diene in a hydrocarbon solvent using an organic alkali metal polymerization initiator to generate a living polymer; adding a terminating agent selected from amines, esters, ketones, or halogen compounds to deactivate the active terminal of the living polymer; and selectively hydrogenating the conjugated diene polymer using at least one organotitanium compound and a lithium hydride, which is prepared from a reactor equipped with a high-speed injection nozzle and thereby precisely controlled in regard to particle diameter.Type: ApplicationFiled: September 2, 2003Publication date: July 8, 2004Applicant: Korea Kumho Petrochemical Co., Ltd.Inventors: Young-Hoon Ko, Hoo-Chae Kim, Jae-Yun Kim, Jin-Man Hwang
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Publication number: 20040127655Abstract: The present invention is a process for transitioning from a first polymerization catalyst system to a second polymerization catalyst system incompatible with the first polymerization catalyst system in a gas-phase reactor. The novel process comprises conducting a first polymerization reaction using a first polymerization catalyst system; stopping the first polymerization reaction; removing the contents of the first polymerization reaction from the reactor while maintaining a substantially closed system; then, in the substantially closed system, introducing a substantially contaminant free seedbed into the reactor; introducing a second feed system and a second catalyst system into the reactor; and conducting a second polymerization reaction.Type: ApplicationFiled: October 10, 2003Publication date: July 1, 2004Inventors: Thomas Redden Veariel, George Varcelia Yenetchi, Sandy Clay Hinds, Diwaker Singh, Thierry Polchlopek
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Patent number: 6753388Abstract: This invention is directed to structurally-modified water-soluble polymers prepared by initiating polymerization of an aqueous solution of monomers under free radical polymerization conditions to form a polymer solution and adding at least one structural modifier to the polymer solution after at least 30% polymerization of the monomers has occurred, and to use of the water-soluble cross-linked polymers as flocculating agents.Type: GrantFiled: July 17, 2003Date of Patent: June 22, 2004Assignee: Nalco CompanyInventors: Wesley L. Whipple, Chidambaram Maltesh, Cathy C. Johnson, Ananthasubramanian Sivakumar, Tracey M. Guddendorf, Angela P. Zagala
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Publication number: 20040106751Abstract: The present invention relates to the use of thermally triggered compounds that when used with a polymerization catalyst in a polymerization process results in the controllable generation of one or more catalyst inhibitors that renders the polymerization catalyst substantially or completely inactive.Type: ApplicationFiled: November 24, 2003Publication date: June 3, 2004Inventors: Timothy T. Wenzel, Dick Alan Nagaki, Thomas Henry Peterson, David James Schreck
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Patent number: 6734264Abstract: Vinylidene fluoride polymers are produced by using a C3-C5 hydrocarbon as a chain transfer agent in the free radical polymerization process.Type: GrantFiled: December 16, 2002Date of Patent: May 11, 2004Assignee: Atofina Chemicals, Inc.Inventor: Ramin Amin-Sanayei
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Patent number: 6730751Abstract: The present invention includes a bimodal polyethylene polymerization process wherein metallocene catalyst to is used to adjust the hydrogen response of a Ziegler-Natta catalyst. The polymerization may be carried out in a single reactor or in two or more reactors in series, preferably two or more continuously stirred tank reactors in series. In an embodiment having two or more reactors, the Zeigler-Natta catalyst is added to a first reactor and the metallocene catalyst is added to a downstream reactor. In another embodiment having two or more reactors, the Zeigler-Natta catalyst and metallocene catalyst are added to the same reactor, preferably an upstream reactor. A preferred Zeigler-Natta catalyst comprises TiCl4, and a preferred metallocene catalyst comprises bis(cyclopentadienyl) titanium dichloride.Type: GrantFiled: July 16, 2002Date of Patent: May 4, 2004Assignee: Fina Technology, Inc.Inventors: Edwar S. Shamshoum, Luc Haspeslagh, Hong Chen
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Patent number: 6689846Abstract: The present invention relates to a process for polymerizing &agr;-olefins in at least two stages, the first stage comprising at least one bulk reactor and optionally at least one gas phase reactor for forming the &agr;-olefin polymer matrix and the second stage comprising at least one additional gas phase reactor for copolymerization of ethylene with said polymer matrix. In the second stage an antifouling composition is fed into said gas phase reactor(s) for preventing fouling in the second stage.Type: GrantFiled: November 2, 2001Date of Patent: February 10, 2004Assignee: Borealis Technology OyInventors: Pauli Leskinen, Kauno Alastalo
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Publication number: 20040024146Abstract: The invention relates to processes and plants for continuous solution polymerization. Such plant and processes include a pressure source, a polymerization reactor, downstream of said pressure source, pressure let-down device, downstream of said polymerization reactor, and a separator, downstream of said pressure let-down device, wherein said pressure source is sufficient to provide pressure to said reaction mixture during operation of said process plant to produce a single-phase liquid reaction mixture in said reactor and a two-phase liquid-liquid reaction mixture in said separator in the absence of an additional pressure source between said reactor and said separator.Type: ApplicationFiled: April 24, 2003Publication date: February 5, 2004Inventor: Chris B. Friedersdorf
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Publication number: 20040024117Abstract: The present invention is to provide a continuous anion polymerization method for preparing transparent high impact vinyl aromatic polymer comprising the steps of: i) charging and polymerizing vinyl aromatic monomers and initiator to obtain vinyl aromatic polymer in the presence of solvent and polar organic compounds in the first reactor (1a); ii) continuously charging and polymerizing vinyl aromatic monomers and conjugated diene monomers to the vinyl aromatic polymer obtained in the first reactor to obtain tapered vinyl aromatic polymer chain in the presence of organic solvent in the second reactor (1b); iii) continuously charging and polymerizing vinyl aromatic monomers and multi-functional compounds to the vinyl aromatic polymer chain obtained in the second reactor to obtain high impact vinyl aromatic polymer in the presence of organic solvent in the third reactor (1c); and iv) terminating the reaction with terminator and removing the remaining hydrocarbon solvent and unreacted monomers to obtain transparenType: ApplicationFiled: December 17, 2002Publication date: February 5, 2004Inventors: Jong-Hyun Bae, Jong-Hyun Park, Jong-Geun Kim, Dai-Seung Choi, Sam-Min Kim
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Patent number: 6686422Abstract: It has been discovered that the polymerization of diene compounds, such as butadiene, may be inhibited by the addition of a composition that contains at least one hindered or unhindered phenol, in combination with low nitrogen content component which is a stable nitroxide and/or a hydroxylamine substituted with at least one alkyl, aryl or alkylaryl group; and/or a second, different hindered or unhindered phenol, and optionally a hydrogen transfer agent.Type: GrantFiled: January 2, 2003Date of Patent: February 3, 2004Assignee: Baker Hughes IncorporatedInventor: Muslim D. Shahid
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Patent number: 6677408Abstract: The invention relates to a method for producing ethylene homo- and copolymers in a tubular reactor at pressures above 1000 bar and temperatures in the range from 120 to 350° C. by free-radical polymerization, in which firstly small amounts of free-radical chain initiators are added to a mobile flow medium comprising ethylene, molecular weight regulator and optionally polyethylene, and the polymerization is then carried out.Type: GrantFiled: December 6, 2001Date of Patent: January 13, 2004Assignee: Basell Polyolefine GmbHInventors: Frank-Olaf Mähling, Andreas Daiss, Georg Groos, Andreas Wölfert
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Patent number: 6673879Abstract: It has been discovered that the polymerization of unsaturated compounds, such as butadiene, may be inhibited by the addition of a diene and/or alkanolamine inhibitor. The inhibitor is believed to catalytically destroy peroxides present, such as hydrogen peroxide, which may be present in trace amounts. Particularly useful inhibitors include, but are not limited to, ethylenediamine (EDA) and monoethanolamine (MEA).Type: GrantFiled: January 3, 2003Date of Patent: January 6, 2004Assignee: Baker Hughes IncorporatedInventor: Muslim D. Shahid
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Patent number: 6673880Abstract: 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 of olefins. Particularly it is possible to prepare, with high yields, ethylene (co)polymers having low molecular weights and narrow molecular weight distributions, without the need of using considerable amounts of molecular weight regulators, such as hydrogen.Type: GrantFiled: October 5, 2001Date of Patent: January 6, 2004Assignee: Basell Technology Company B.V.Inventors: Colin J. Schaverien, René Ernst, Jan-Dirk van Loon, Tiziano Dall'Occo
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Patent number: 6664346Abstract: A high-quality protective film for a dry film resist is provided. A film of a polyethylene is used as the protective film, the polyethylene being prepared by pressurizing ethylene with use of an ultra-high pressure compressor and then polymerizing the ethylene at a reaction temperature of 190° to 300° C. and a reaction pressure of not lower than 167 MPa in the presence of a radical polymerization initiator, or by pressuring ethylene with use of an ultra-high pressure compressor and then polymerizing the ethylene at a reaction temperature of 190° to 300° C. in the presence of a radical polymerization initiator while allowing a radical polymerization inhibitor to be present in the reaction system.Type: GrantFiled: December 13, 2000Date of Patent: December 16, 2003Assignee: Japan Polyolefins Co., Ltd.Inventors: Katsuaki Tsutsumi, Isao Hashimoto
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Patent number: 6660814Abstract: In the process and a correspondingly appropriate device for preparing homo- or copolymers of at least one of the, polymerizable monomers of the group consisting of styrene, butadiene, vinyl chloride, vinyl acetate, vinylidene chloride, alkyl (meth)acrylatc (meth)acrylic acid, (meth)acrylonitrile and (meth)acrylamide reaction is carried out at at least 40° C. in the presence of a dispersing auxiliary and of a free-radical polymerization initiator such that at least 85% by weight of the polymer is formed from these monomers.Type: GrantFiled: September 30, 1997Date of Patent: December 9, 2003Assignee: BASF AktiengesellschaftInventors: Huberrus Kröner, Wolfgang Klanig, Bradley Ronald Morrison, Rainer Klostermann, Holger Schöpke, Walter Kastenhuber
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Publication number: 20030216511Abstract: The present invention relates to a bimodal linear block copolymer containing a tapered block and its manufacturing method. The bimodal linear block copolymer includes a hexa-block copolymer of vinyl aromatic block(PS1)-conjugated diene block(PB1)-tapered block(T1)-vinyl aromatic block(PS2-PS3)-conjugated diene block(PB2)-vinyl aromatic block (PS4) as prepared by adding two charges of an initiator, and a tri-block copolymer of vinyl aromatic block(PS3)-conjugated diene block(PB2)-vinyl aromatic block (PS4). The bimodal linear block copolymer is prepared by adding more than one charge of the initiator, vinyl aromatic monomers and conjugated diene monomers to acquire transparency, toughness, rigidity and flexibility, and thereby can be used for sheets or films, or injection or blow molding products.Type: ApplicationFiled: March 5, 2003Publication date: November 20, 2003Applicant: Korea Kumho Petrochemical Co., Ltd.Inventors: Jong-Geun Kim, Sam-Min Kim, Dai-Seung Choi, Jong-Hyun Park
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Publication number: 20030212218Abstract: This invention relates to a process for controlling the architecture of copolymers of at least two unsaturated monomers, made by free-radical polymerization in the presence of a cobalt-containing chain transfer agent, including the control of molecular weight, degree of branching and vinyl end group termination, by varying at least one of the variables of molar ratio of monomers, their relative chain transfer constants, polymerization temperature and degree of conversion and amount of cobalt chain transfer agent; and polymers made thereby.Type: ApplicationFiled: April 18, 2003Publication date: November 13, 2003Inventors: Graeme Moad, Ezio Rizzardo, Catherin Louise Moad, Steven Dale Ittel, Lech Wilczek, Alexei A. Gridnev
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Patent number: 6646044Abstract: A stable continuous production of a propylene-based block copolymer can proceed for a long time without causing accumulation of particles having a small diameter by a process having the following steps: (1) polymerizing an &agr;-olefin containing liquid propylene as a main component in the presence of hydrogen and a stereoregular polymerization catalyst in one or more polymerization reactors to obtain a polymer slurry; (2) feeding the polymer slurry to a copolymerization reactor; and (3) copolymerizing propylene and an &agr;-olefin other than propylene substantially in a gaseous phase in the presence of the stereoregular polymerization catalyst, the polymer slurry and a deactivating compound in the copolymerization reactor to obtain a propylene-block copolymer powder.Type: GrantFiled: March 16, 2001Date of Patent: November 11, 2003Assignee: Japan Polychem CorporationInventors: Fuminao Watanabe, Eiji Tanaka, Jun Hosoi
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Patent number: 6642337Abstract: The problem addressed by the invention was to find an anionic polymerization inhibitor for cyanoacrylate adhesives containing one or more cyanoacrylates, stabilizers against anionic and radical polymerization and auxiliaries typically used in such adhesive systems which, besides a reliable inhibiting effect, would counteract any increase in the setting time after storage. This problem was solved by using 2-oxo-1,3,2-dioxathiolanes as inhibitors.Type: GrantFiled: July 31, 2000Date of Patent: November 4, 2003Assignee: Henkel Kommanditgesellschaft auf AktienInventors: Hanns-Roland Misiak, Dagmar Behn
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Patent number: 6639026Abstract: Methods and compositions for inhibiting the polymerization of vinyl monomers are disclosed. Combinations of aminophenol compounds and nitroxyl radical compounds are effective at inhibiting vinyl monomer polymerization under both processing and storage conditions.Type: GrantFiled: May 22, 2001Date of Patent: October 28, 2003Assignee: GE Betz, Inc.Inventor: Sherif Eldin
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Patent number: 6639027Abstract: A production process for a vinyl-based polymer is provided. The production process comprises a step for polymerizing a vinyl-based monomer by a radical reaction within an aqueous medium in a polymerization vessel, and a step for supplying a reaction inhibitor with a melting point of no more than 40° C. from a reaction inhibitor supply tank to the polymerization vessel via a reaction inhibitor supply pipe. The reaction inhibitor supply tank and the reaction inhibitor supply pipe are heated, and the reaction inhibitor is added to the polymerization vessel in a liquid state with a viscosity of no more than 200 mPa·s. The reaction inhibitor can be added to the polymerization mixture without the use of an organic solvent even at low temperatures, and problems such as the solidification of the reaction inhibitor inside the supply tank or piping, and subsequent blocking of the piping do not occur.Type: GrantFiled: December 16, 2002Date of Patent: October 28, 2003Assignee: Shin-Etsu Chemical Co., Ltd.Inventors: Ryuichi Saito, Tadashi Amano, Toshihiko Kawakubo
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Patent number: 6620894Abstract: This invention relates to a method to start up an olefin polymerization process comprising: a. calculating a trajectory, from elements including catalyst deactivation rate constants (kd), for the rate of introduction of a catalyst system, into a reactor, said catalyst system comprising two different metal catalyst compounds (A and B) and at least one activator, wherein the ratio of the deactivation constants of the two different metal catalyst compounds kdA/kdB is not 1; and b. introducing olefin monomer, a catalyst system, optional co-monomer, and optional chain transfer or termination agents into a polymerization reactor in a manner such that the catalyst system introduction rate is manipulated to follow the trajectory until a desired production rate is achieved.Type: GrantFiled: December 6, 2001Date of Patent: September 16, 2003Assignee: Univation Technologies, LLCInventor: William Howard Sachs
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Publication number: 20030153696Abstract: A production process for a vinyl-based polymer is provided. The production process comprises a step for polymerizing a vinyl-based monomer by a radical reaction within an aqueous medium in a polymerization vessel, and a step for supplying a reaction inhibitor with a melting point of no more than 40° C. from a reaction inhibitor supply tank to the polymerization vessel via a reaction inhibitor supply pipe. The reaction inhibitor supply tank and the reaction inhibitor supply pipe are heated, and the reaction inhibitor is added to the polymerization vessel in a liquid state with a viscosity of no more than 200 mPa·s. The reaction inhibitor can be added to the polymerization mixture without the use of an organic solvent even at low temperatures, and problems such as the solidification of the reaction inhibitor inside the supply tank or piping, and subsequent blocking of the piping do not occur.Type: ApplicationFiled: December 16, 2002Publication date: August 14, 2003Applicant: Shin-Etsu Chemical Co., Ltd.Inventors: Ryuichi Saito, Tadashi Amano, Toshihiko Kawakubo
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Patent number: 6605674Abstract: This invention is directed to structurally-modified water-soluble polymers prepared by initiating polymerization of an aqueous solution of monomers under free radical polymerization conditions to form a polymer solution and adding at least one structural modifier to the polymer solution after at least 30% polymerization of the monomers has occurred, and to use of the water-soluble cross-linked polymers as flocculating agents.Type: GrantFiled: June 29, 2000Date of Patent: August 12, 2003Assignee: Ondeo Nalco CompanyInventors: Wesley L. Whipple, Chidambaram Maltesh, Cathy C. Johnson, Ananthasubramanian Sivakumar, Tracey M. Guddendorf, Angela P. Zagala
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Patent number: 6596824Abstract: Provided is a continuous vapor-phase polymerization method for producing polyolefins. In the method, polymer agglomerates and aggregates are prevented from being formed, and polymer deposition on the wall of reactors and around stirring blades is prevented. The method enables continuous and stable production of high-quality polyolefins, with no pipe line clogging. The method is characterized by a specific supply mode of feeding a catalyst activity retardant such as alcohol into polymerization reactors. Specifically, the retardant is fed into the vapor phase in a polymerization reactor and into the powder phase therein through its side wall. Preferably, the retardant is fed into the powder phase through a plurality of sites of the side wall of the reactor.Type: GrantFiled: November 16, 2001Date of Patent: July 22, 2003Assignee: Idemitsu Petrochemical Co., Ltd.Inventors: Tomoo Nambu, Masao Aida, Masatoshi Toda
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Patent number: 6593429Abstract: A combined linear and nonlinear polymer (i.e., having a combined linear, branched and radial structure) P+PnD according to the present invention is represented by (P+PnD)−+Li, where P is a polymer of a monovinyl aromatic monomer or a conjugated diene monomer; PD is a nonlinear polymer having a combined linear, branched and radial structure due to a multifunctional compound D bonded to the polymer P; n is an integer ranging from 2 to 10 and represents the average number of bonds between the monovinyl aromatic or conjugated diene polymer P and the multifunctional compound D; and +Li represents a metal ion as a partner of the active anion (P+PnD)−. The combined linear and nonlinear polymer of the present invention, characterized by nonlinearity-related properties (i.e.Type: GrantFiled: July 22, 2002Date of Patent: July 15, 2003Assignee: Korea Kumho Petrochemical Co., Ltd.Inventors: Sam-Min Kim, Jong-Geun Kim, Jong-Hyun Park
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Publication number: 20030105249Abstract: It has been discovered that the polymerization of diene compounds, such as butadiene, may be inhibited by the addition of a composition that contains at least one hindered or unhindered phenol, in combination with low nitrogen content component which is a stable nitroxide and/or a hydroxylamine substituted with at least one alkyl, aryl or alkylaryl group; and/or a second, different hindered or unhindered phenol, and optionally a hydrogen transfer agent.Type: ApplicationFiled: January 2, 2003Publication date: June 5, 2003Inventor: Muslim D. Shahid
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Patent number: 6562915Abstract: In a process for the polymerization or copolymerization of ethylenically unsaturated monomers in the presence of polymerization initiators which decompose to form free radicals in a continuously operated polymerization apparatus comprising a fresh gas feed line, a precompressor, a postcompressor, a reactor, a pressure maintenance valve, a high-pressure circuit having a high-pressure product separator and a high-pressure circulation gas return line, a product valve and a low-pressure circuit having a low-pressure product separator and a low-pressure circulation gas return line, nitrogen monoxide or oxygen is introduced as inhibitor into the high-pressure circuit, into the low-pressure circuit and/or the precompressor.Type: GrantFiled: July 31, 2002Date of Patent: May 13, 2003Assignees: Basell Polyolefine GmbH, BASF AktiengesellschaftInventors: Frank-Olaf Mähling, Andreas Deckers, Dieter Littmann, Heinz Friedrich Sutoris, Kaspar Evertz
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Publication number: 20030065110Abstract: At least one nitroxide derivative is used to stabilize pure acrolein or highly concentrated solutions thereof (acrolein content ≧90% by weight), in contact with an essentially anaerobic atmosphere.Type: ApplicationFiled: August 30, 2002Publication date: April 3, 2003Inventors: Stephane Lepizzera, Michel Fauconet
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Patent number: 6541579Abstract: An aqueous phase inhibitor for quenching free radical polymerization comprising a free radical quenching agent having a hydrophilic tail is disclosed, as well as a coating and related methods. In one embodiment, the free radical quenching agent can either be an N-hydroxylamine or an N-nitrosonamine, the hydrophilic tail can be a polyhydric alcohol tail and the inhibitor can be a concentrate in a liquid medium such as water, alcohol and mixture thereof.Type: GrantFiled: November 28, 2001Date of Patent: April 1, 2003Assignee: Sun Drilling Products CorporationInventor: Robert Albright
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Patent number: 6538083Abstract: This invention concerns a process for the use of hydrogen halides as chain transfer agents in fluoroolefin polymerization.Type: GrantFiled: December 11, 2000Date of Patent: March 25, 2003Assignee: E. I. du Pont de Nemours and CompanyInventors: William B Farnham, Robert C Wheland
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Publication number: 20030045656Abstract: The present invention relates to a fiber which comprises at least one partly crystalline cycloolefin copolymer which can be prepared by polymerization of a symmetrical polycyclic olefin, an acyclic olefin and, if desired, a monocyclic olefin in the presence of a catalyst system comprising an aluminoxane and a metallocene compound of the formula 1Type: ApplicationFiled: May 21, 2002Publication date: March 6, 2003Inventors: Frank Osan, Michael-Joachim Brekner