Patents Assigned to DuPont Dow Elastomers LLC
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Patent number: 7001951Abstract: Extrusion processability of non-fluorinated melt-processable polymers is improved by introducing a fluoropolymer process aid by means whereby the weight average particle size of the fluoropolymer is greater than 2 microns as it reaches the extruder die entrance.Type: GrantFiled: February 11, 2003Date of Patent: February 21, 2006Assignee: Dupont Dow Elastomers, LLCInventors: George Richard Chapman, Jr., Steven Richard Oriani
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Patent number: 6992143Abstract: A non-black filled perfluoroelastomer composition comprising a) a perfluoroelastomer having nitrile group cure sites, b) a curative selected from the group consisting of i) a bis(aminophenol) and ii) a compound that decomposes at curing temperatures to generate ammonia and c) 1–25 phr hydrophobic silica filler. Cured compositions have surprisingly better compression set than do similar compounds containing hydrophilic silica.Type: GrantFiled: June 8, 2004Date of Patent: January 31, 2006Assignee: DuPont Dow Elastomers LLCInventor: Shuhong Wang
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Patent number: 6946511Abstract: Elastomeric parts having a magnetic flux density of at least 10 gauss on their surface deflect a portion of reactive plasmas from contact with the surface of the parts. Thus, such parts may be exposed to reactive plasmas for longer periods, with less degradation, than may similar elastomer parts that do not have such a magnetic flux density on their surface.Type: GrantFiled: October 20, 2003Date of Patent: September 20, 2005Assignee: DuPont Dow Elastomers, LLCInventors: Kaori Iwamoto, Bunichi Rai, Shinichi Sogo
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Patent number: 6932354Abstract: The present invention is directed to a valve seal assembly for use in multi-chamber vacuum devices. The seal assembly comprises a door and a deformable seal ring running along the periphery of the door, wherein the seal ring is held in place by a reversibly mounted securing means such as a disk, ring or clamp.Type: GrantFiled: February 6, 2003Date of Patent: August 23, 2005Assignee: DuPont Dow Elastomers, LLCInventors: Dale Robert Kane, Norihisa Minowa, Kohtaro Takahashi
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Patent number: 6927259Abstract: Compositions of specialty fluoroelastomers containing copolymerized units of tetrafluoroethylene, propylene, optionally vinylidene fluoride, and a cure site monomer selected from the group consisting of i) perfluoroalkyl ethylenes and vii) perfluoroalkoxy ethylenes are readily curable with polyhydroxy curing systems. The resulting cured articles have a combination of excellent resistance to alkaline fluids, superior tensile properties and compression set resistance.Type: GrantFiled: April 1, 2003Date of Patent: August 9, 2005Assignee: DuPont Dow Elastomers LLCInventor: Walter Werner Schmiegel
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Patent number: 6924344Abstract: Compositions of specialty fluoroelastomers containing copolymerized units of tetrafluoroethylene, propylene, optionally vinylidene fluoride, and a cure site monomer selected from the group consisting of i) trifluoroethylene, ii) 3,3,3-trifluoropropene-1, iii) 1,2,3,3,3-pentafluoropropylene, iv) 1,1,3,3,3-pentafluoropropylene, and v) 2,3,3,3-tetrafluoropropene are readily curable with polyhydroxy curing systems. The resulting cured articles have a combination of excellent resistance to alkaline fluids, superior tensile properties and compression set resistance.Type: GrantFiled: November 24, 2003Date of Patent: August 2, 2005Assignee: DuPont Dow Elastomers LLCInventors: John Gordon Bauerle, Walter Werner Schmiegel
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Patent number: 6916887Abstract: A base resistant, substantially amorphous fluoroelastomer comprising (1) 10-40 mole percent ethylene units, (2) 32-60 mole percent tetrafluoroethylene units, (3) 20-40 mole percent perfluoro ether units selected from the group consisting of perfluoro(alkyl vinyl ethers), perfluoro(alkyl alkenyl ethers) and perfluoro(alkoxy alkenyl ethers), and (4) 0.1 to 15 mole percent of a cure site monomer selected from the group consisting of i) perfluoroalkyl ethylenes and ii) perfluoroalkoxy ethylenes. Such fluoroelastomers may be vulcanized with polyhydroxy curing agents. The resulting vulcanized fluoroelastomers are resistant to attack by amines, strong bases and hydrogen sulfide and possess a combination of good low temperature and high temperature properties and they are resistant to oil swell.Type: GrantFiled: April 1, 2003Date of Patent: July 12, 2005Assignee: DuPont Dow Elastomers LLCInventor: Walter Werner Schmiegel
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Patent number: 6906137Abstract: A process aid masterbatch comprising a) 0.05 to 25 weight percent fluoropolymer; b) 0.2 to 10 weight percent of an organic soap selected from the group consisting of carboxylic acids having from 6 to 34 carbon atoms; salts thereof; hydrocarbon sulfonates having from 6 to 34 carbon atoms; and salts thereof; c) at least 5 weight percent mineral particulate; and d) a non-fluorinated melt-processable polymer improves the extrusion processability of non-fluorinated melt-processable polymers.Type: GrantFiled: January 21, 2004Date of Patent: June 14, 2005Assignees: DuPont Dow Elastomers LLC, Ingenia Polymers CorporationInventors: Steven Richard Oriani, Salvatore D'Uva, Viraj Pramod Trilokekar
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Patent number: 6894118Abstract: Extrusion processability of non-fluorinated melt-processable polymers is improved by introducing a fluoropolymer process aid by means whereby the weight average particle size of the fluoropolymer is greater than 2 microns as it reaches the extruder die entrance.Type: GrantFiled: June 23, 2003Date of Patent: May 17, 2005Assignee: DuPont Dow Elastomers LLCInventors: George Richard Chapman, Jr., Steven Richard Oriani
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Patent number: 6887959Abstract: A base resistant, substantially amorphous fluoroelastomer comprising (1) 10-40 mole percent ethylene units, (2) 32-60 mole percent tetrafluoroethylene units, (3) 20-40 mole percent perfluoro ether units selected from the group consisting of perfluoro(alkyl vinyl ethers), perfluoro(alkyl alkenyl ethers) and perfluoro(alkoxy alkenyl ethers), and (4) 0.1 to 15 mole percent of a cure site monomer selected from the group consisting of i) 3,3,3-trifluoropropene-1, ii) trifluoroethylene, iii) 1,2,3,3,3-pentafluoropropylene, iv) 1,1,3,3,3-pentafluoropropylene, and v) 2,3,3,3-tetrafluoropropene. Such fluoroelastomers may be vulcanized with polyhydroxy curatives. The resulting vulcanized fluoroelastomer compositions are resistant to attack by amines, strong bases and hydrogen sulfide and possess a combination of good low temperature and high temperature properties and they are resistant to oil swell.Type: GrantFiled: September 24, 2003Date of Patent: May 3, 2005Assignee: DuPont Dow Elastomers LLCInventors: Walter Werner Schmiegel, Phan Linh Tang
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Patent number: 6875820Abstract: Chlorinated olefin polymers prepared from olefin polymer base resins having I10 values of 0.05-0.8 dg/minute act as impact modifiers for vinyl chloride polymers under low to ambient temperature conditions. When vinyl chloride polymers are mixed with a preferred class of the chlorinated polymers, having chlorine contents of 20-30 percent by weight, compositions that exhibit short fusion times and low fusion temperatures are produced.Type: GrantFiled: April 18, 2001Date of Patent: April 5, 2005Assignee: DuPont Dow Elastomers LLCInventors: Mark Thomas Berard, Virginia Hayes Guffey, Gary Robert Marchand
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Patent number: 6852417Abstract: Adhesion promoting primer compositions comprising mixtures of a) an epoxy-silane, b) a polyhydroxy compound, and c) an organo-onium compound improve the adhesion between metal, ceramic or glass surfaces and base-resistant polyhydroxy or peroxide curable fluoroelastomers.Type: GrantFiled: May 5, 2003Date of Patent: February 8, 2005Assignee: DuPont Dow Elastomers, LLCInventor: Robert Earl Fuller
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Patent number: 6849694Abstract: The present invention is specifically directed to improved polyvinyl chloride compositions having excellent impact strength. In particular, the impact resistant composition comprises a vinyl chloride polymer and 2-8 parts of an impact modifier composition comprising at least one ethylene/alpha-olefin copolymer and at least one chlorinated olefin polymer per 100 parts of the vinyl chloride polymer. Preferably the impact modifier composition comprises less than 1 part of the ethylene/alpha-olefin copolymer and the ratio of said copolymer to the total modifier composition is less than 25%.Type: GrantFiled: January 15, 2003Date of Patent: February 1, 2005Assignee: DuPont Dow Elastomers, LLCInventor: Nobuhiro Hata
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Patent number: 6830808Abstract: Cured perfluoroelastomer articles are disclosed which have improved surface characteristics. The articles are coated with a thin durable film comprising a polysiloxane and urethane oligomer which reduces surface stickiness, while maintaining the sealing properties of the article.Type: GrantFiled: July 2, 2003Date of Patent: December 14, 2004Assignee: Dupont Dow Elastomers, LLCInventors: Kaori Iwamoto, Bunichi Rai, Shinichi Sogo
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Patent number: 6825389Abstract: The present invention involves a process for the manufacture of &agr;, &ohgr;-diiodoperfluoroalkanes of the formula I—(CF2CF2)n—I, wherein n is an integer between 2 and 6. The latter compounds are produced at relatively high conversions and under relatively mild reaction temperatures and pressures, compared to prior art processes, by the elimination of the gaseous byproduct perfluorocyclobutane throughout the process.Type: GrantFiled: November 21, 2002Date of Patent: November 30, 2004Assignee: DuPont Dow Elastomers LLCInventors: Hasan Dindi, John Joseph Hagedorn, Ming-Hong Hung
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Patent number: 6803391Abstract: Ethylene copolymer elastomer compositions, acrylate rubber compositions, nitrile rubber compositions, fluoroelastomer compositions, and chlorinated olefin elastomer compositions are provided which are curable by exposure to UV radiation. The compositions are particularly suited for production of elastomeric seals using hot melt equipment and a gasketing in place technique.Type: GrantFiled: September 20, 2002Date of Patent: October 12, 2004Assignee: DuPont Dow Elastomers, LLCInventors: Patrick Luigi Paglia, Christian Ruepping
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Patent number: 6774186Abstract: Rheology-modified thermoplastic elastomer compositions comprising a melt blend of an ethylene/&agr;-olefin polymer and a high melting polymer such as polypropylene or a propylene/&agr;-olefin copolymer wherein the rheology modification is induced by a combination of a peroxide and a free radical coagent. The resulting compositions have an elastomeric phase, a non-elastomeric phase and certain physical properties that exceed those of a like composition that is rheology-modified by peroxide alone. The compositions can be used to make a variety of articles of manufacture, such as automotive instrument panel skins, via calendaring and thermoforming procedures.Type: GrantFiled: February 10, 2003Date of Patent: August 10, 2004Assignee: DuPont Dow Elastomers LLCInventor: Kim Louis Walton
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Patent number: 6746723Abstract: Ethylene copolymer elastomer compositions, acrylate rubber compositions, nitrile rubber compositions, fluoroelastomer compositions, and chlorinated olefin elastomer compositions are provided which are curable by exposure to UV radiation. The compositions are particularly suited for production of elastomeric seals using hot melt equipment and a gasketing in place technique.Type: GrantFiled: September 26, 2002Date of Patent: June 8, 2004Assignee: DuPont Dow Elastomers LLCInventors: Patrick Luigi Paglia, Christian Ruepping
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Patent number: 6733846Abstract: Ethylene copolymer elastomer compositions, acrylate rubber compositions, nitrile rubber compositions, fluoroelastomer compositions, and chlorinated olefin elastomer compositions are provided which are curable by exposure to UV radiation. The compositions are particularly suited for production of elastomeric seals using hot melt equipment and a gasketing in place technique.Type: GrantFiled: February 5, 2003Date of Patent: May 11, 2004Assignee: DuPont Dow Elastomers LLCInventor: Christian Ruepping
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Patent number: 6680361Abstract: Shear-thinning ethylene/&agr;-olefin and ethylene/&agr;-olefin/diene monomer interpolymers that do not include a traditional branch-inducing monomer such as norbornadiene are prepared at an elevated temperature in an atmosphere that has little or no hydrogen using a constrained geometry complex catalyst and an activating cocatalyst.Type: GrantFiled: May 2, 2001Date of Patent: January 20, 2004Assignee: DuPont Dow Elastomers LLCInventors: Larry Duane Cady, Morgan Mark Hughes, Michael Kenneth Laughner, Larry Alan Meiske, Deepak Rasiklal Parikh