Fluorocarbon Resin Patents (Class 264/127)
  • Patent number: 10138161
    Abstract: The present invention pertains to a process for manufacturing a fluoropolymer composite, said process comprising the following sequential steps: (i) providing an aqueous latex comprising from 10% to 40% by weight, preferably from 15% to 35% by weight of at least one fluoropolymer comprising recurring units derived from vinylidene fluoride (VDF) [polymer (VDF)]; (ii) up-concentrating the aqueous latex provided in step (i) thereby providing an up-concentrated aqueous latex comprising from 45% to 60% by weight, preferably from 45% to 55% by weight of at least one polymer (VDF); (iii) contacting one continuous fiber or a bunch of continuous fibers with the up-concentrated aqueous latex provided in step (ii); (iv) squeezing the impregnated fibrous material provided in step (iii); (v) drying the squeezed fibrous material provided in step (iv), typically at a temperature comprised between 100° C. and 120° C.; (vi) baking the dried fibrous material provided in step (v) at a temperature comprised between 190° C.
    Type: Grant
    Filed: May 29, 2014
    Date of Patent: November 27, 2018
    Assignee: SOLVAY SPECIALTY POLYMERS ITALY S.P.A.
    Inventors: Eliana Ieva, Rui Liu, Elisabetta Sartirana
  • Patent number: 10030157
    Abstract: In one aspect, microporous membranes are described herein demonstrating composite architectures and properties suitable for electronic and/or optical applications. In some embodiments, a composite membrane described herein includes a microporous polymeric matrix or substrate having an interconnected pore structure and an index of refraction and an electrically conductive coating deposited over one or more surfaces of the microporous polymeric matrix. In other embodiments, the pores are filled and the membranes are substantially transparent.
    Type: Grant
    Filed: April 15, 2015
    Date of Patent: July 24, 2018
    Assignee: Celgard, LLC
    Inventors: Karl F. Humiston, Kristoffer K. Stokes
  • Patent number: 10004832
    Abstract: A method to make a PTFE skived film capable of exhibiting, with a single layer, sliding properties, barrier properties with regard to a liquid contact surface, and excellent tear resistance during injection molding. This skived film is obtained by cutting a polytetrafluoroethylene block or a modified polytetrafluoroethylene block subjected to a thermal fusion treatment under reduced pressure or subjected to a pressurized thermal fusion treatment after being subjected to fusion under reduced pressure.
    Type: Grant
    Filed: January 5, 2016
    Date of Patent: June 26, 2018
    Assignee: COKI ENGINEERING INC.
    Inventor: Akira Yotsutsuji
  • Patent number: 9988758
    Abstract: Woven and knit fabrics containing expanded polytetrafluoroethylene (ePTFE) fibers and at least one other fiber are provided. The ePTFE fiber may be woven or knit as a single, non-twisted fiber, as part of a multifilament fiber, or may be twisted or braided with another fiber. The ePTFE fiber, whether alone or in combination with a weave fiber(s), may be utilized in either the warp and/or the weft direction. The woven and knit fabrics are concurrently breathable, lightweight, durable, drapable, and fast drying. The ePTFE fibers have a substantially rectangular configuration. In some embodiments, the woven or knit fabric is flame resistant. In addition, the woven and knit fabrics are quiet, soft, and drapable. Treatments may be provided to the surface of the ePTFE fiber and/or the fabrics to impart one or more desired functionality, such as, for example, oleophobicity, anti-microbial, contamination resistance, or UV stability.
    Type: Grant
    Filed: December 14, 2015
    Date of Patent: June 5, 2018
    Assignee: W. L. Gore & Associates, Inc.
    Inventors: David J. Minor, Mustafa Arifoglu, Raymond B. Minor
  • Patent number: 9963564
    Abstract: A modified fluorine-containing copolymer obtained by irradiating a copolymer with radiation at a temperature of not higher than the melting point of the copolymer. The copolymer includes at least one copolymer selected from a copolymer including a tetrafluoroethylene unit and a perfluoro(alkyl vinyl ether) unit and a copolymer including a tetrafluoroethylene unit and a hexafluoropropylene unit, and has 10 to 10000 functional groups in total per 106 carbon atoms.
    Type: Grant
    Filed: December 19, 2014
    Date of Patent: May 8, 2018
    Assignee: DAIKIN INDUSTRIES, LTD.
    Inventors: Hitoshi Imamura, Takahisa Aoyama, Hideki Kono, Tatsuya Funaoka, Hirokazu Itou
  • Patent number: 9909637
    Abstract: A damper device includes a stator, a rotor, and a viscous fluid imparting a resistance to a rotation or a relative rotation of the rotor, and forms a braking force by the resistance. In the rotor, an annular seal portion made of soft synthetic resin is provided by integral molding. The stator includes an annular space in which the viscous fluid is filled, and a main member portion of the rotor is housed in the annular space. The annular seal portion comprises an outside annular portion provided in an outer circumferential portion of the rotor; an inside annular portion provided in an inner circumferential portion of the rotor; and a connection portion therebetween.
    Type: Grant
    Filed: January 28, 2015
    Date of Patent: March 6, 2018
    Assignee: NIFCO INC.
    Inventor: Makoto Muranaka
  • Patent number: 9819040
    Abstract: A printed fuel cell having integrated gas channels, and having an anode layer, where a first gas diffusion electrode layer is periodically fixed to the anode layer, wherein the periodically fixed first gas diffusion electrode layer defines hydrogen flow field channels. A first catalyst material is coated or infused to the first gas diffusion electrode layer. An electrolyte membrane covers portions of the anode layer and first gas diffusion electrode layer with the first catalyst material. A second catalyst material is coated or infused to the electrolyte membrane. A second gas diffusion electrode layer is in operative association with the electrolyte membrane and second catalyst material, on a surface of the electrolyte membrane different from a surface of the electrolyte membrane which is in contact with the first gas diffusion electrode layer, and a perforated cathode is in contact with the second gas diffusion electrode layer.
    Type: Grant
    Filed: January 22, 2013
    Date of Patent: November 14, 2017
    Assignee: PALO ALTO RESEARCH CENTER INCORPORATED
    Inventor: Karl A. Littau
  • Patent number: 9728299
    Abstract: The present invention provides a material based on high density polytetrafluoroethylene (PTFE) and its applications, such as in the production of electric cable. The PTFE material of the invention includes PTFE, a metal oxide, a lubricant and a wetting agent.
    Type: Grant
    Filed: June 30, 2011
    Date of Patent: August 8, 2017
    Assignee: PRODUITS PLASTIQUES PERFORMANTS HOLDING—3P HOLDING
    Inventors: David Cade, Emmanuel Garraud
  • Patent number: 9630806
    Abstract: A method for constructing an interface between a sheave and a coated belt or rope of an elevator system, includes determining the surface energy of a surface of a coated belt or rope; and selecting a sheave such that the sheave has a work of adhesion between the coated belt or rope and the sheave, the work of adhesion meeting a defined relationship with a work of adhesion threshold.
    Type: Grant
    Filed: May 16, 2012
    Date of Patent: April 25, 2017
    Assignee: OTIS ELEVATOR COMPANY
    Inventors: John P. Wesson, Xiaomei Yu, David R. Polak
  • Patent number: 9631589
    Abstract: It has been discovered that the function of a fuel filter monitor can be accomplished without the use of SAP. The present invention provides a fuel filter monitor comprising an ePTFE membrane, a support structure adjacent to said ePTFE membrane wherein the membrane is disposed upstream of the support and said monitor prevents penetration of water to the downstream of said fuel wet monitor, where the water can be in the form of discrete water drops in the fuel, or a bulk water stream which displaces the upstream fuel.
    Type: Grant
    Filed: October 9, 2013
    Date of Patent: April 25, 2017
    Assignee: W. L. Gore & Associates, Inc.
    Inventor: Gary P. Harp
  • Patent number: 9601820
    Abstract: A dielectric waveguide interconnect system has a dielectric waveguide (DWG) a core surrounded by a cladding along the length of the DWG. One or more periodic structures are embedded along the length of the DWG such that the core of the DWG is integral to each of the one or more periodic structures.
    Type: Grant
    Filed: December 22, 2014
    Date of Patent: March 21, 2017
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Juan Alejandro Herbsommer, Benjamin S. Cook
  • Patent number: 9480953
    Abstract: The present invention provides a composite filter media for use in a fuel stream wherein the composite media provides significantly improved resistance to water penetration as indicated by the FWWPP normalized for fuel IFT and a reduced resistance to flow of the fuel stream as indicated by the Ratio of Resistances.
    Type: Grant
    Filed: October 9, 2013
    Date of Patent: November 1, 2016
    Assignee: W. L. Gore & Associates, Inc.
    Inventor: Gary P. Harp
  • Patent number: 9462681
    Abstract: A conductive film includes a base film, a primer layer formed on the base film, the primer layer having voids, and a conductive layer formed on the primer layer. The conductive layer includes a conductor that contains a nano-material forming a network structure.
    Type: Grant
    Filed: March 4, 2014
    Date of Patent: October 4, 2016
    Assignee: LG Electronics Inc.
    Inventors: Yangwook Hur, Jeyong Moon
  • Patent number: 9446344
    Abstract: The invention describes a method for enriching at least one component from a gaseous mixture of substances, comprising the steps of (i) contacting a flow of a first gaseous mixture of substances which contains at least one component to be enriched, with a composite material at a first pressure p1 such that the at least one component to be enriched is adsorbed to the composite material and a charged composite material is obtained, said composite material comprising (a) a porous matrix of a fluorine-containing polymer having a percentage of tetrafluoroethylene monomer units of at least 95 mol % based on the total number of monomer units and (b) zeolite particles which are embedded in the matrix and around which matrix filaments extend; (ii) disrupting the flow of the gaseous mixture of substances and (iii) desorbing the at least one component to be enriched from the charged composite material by reducing the pressure to a pressure p2, with p1?p2?200 mbar, such that a second gaseous mixture of substances is prod
    Type: Grant
    Filed: June 1, 2012
    Date of Patent: September 20, 2016
    Assignee: CLARIANT PRODUKTE (DEUTSCHLAND) GMBH
    Inventors: Achim Koch, Michael Zavrel, Christoph Kröhnke, Ulrich Kettling
  • Patent number: 9421499
    Abstract: The invention offers a microporous modified-polytetrafluoroethylene membrane that is a microporous membrane having a significantly small pore diameter and narrow pore-diameter distribution and that can remove microscopic foreign particles at high efficiency when used as a filtration membrane.
    Type: Grant
    Filed: January 21, 2013
    Date of Patent: August 23, 2016
    Assignee: SUMITOMO ELECTRIC FINE POLYMER, INC.
    Inventors: Fumihiro Hayashi, Aya Oya, Atsushi Uno
  • Patent number: 9175777
    Abstract: A flow controller is provided. The controller includes a shell body, a first supporting member, a driving shaft and an elliptical valve. The shell body has a passage passed therethrough. The first supporting member is assembled to the shell body. The driving shaft is assembled to the first supporting member. The elliptical valve is pivotally assembled in the passage and is connected with the driving shaft. The elliptical valve is rotated by the driving shaft for opening or closing the passage. When the passage is closed by the elliptical valve, the elliptical valve tightly abuts against an inner circular wall of the shell body for completely closing the passage, so that the controller is suitable in a high temperature and high pressure environment.
    Type: Grant
    Filed: December 18, 2014
    Date of Patent: November 3, 2015
    Inventors: Jun-Chien Chen, Chien-Yu Liu
  • Patent number: 9174174
    Abstract: A separation membrane including a separation-functional layer is provided, wherein the separation-functional layer contains a polyvinylidene fluoride-type resin having a melt viscosity of 3,300 Pa·s or more, and also the separation-functional layer has a three-dimensional network structure. A separation membrane is provided having high virus removal performance, high pure water permeability, and high physical durability and high chemical strength, which can also be used in the field of water treatment.
    Type: Grant
    Filed: September 18, 2009
    Date of Patent: November 3, 2015
    Assignee: Toray Industries, Inc.
    Inventors: Kenji Komori, Toshiyuki Ishizaki, Kenta Iwai, Xunyao Fu, Shinichi Minegishi, Nao Minaki
  • Patent number: 9074084
    Abstract: Blended fluoropolymer compositions are provided, in which a liquid dispersion of a first fluoropolymer is blended with a liquid dispersion of a second fluoropolymer. The first fluoropolymer may be polytetrafluoroethylene (PTFE), such as a low molecular weight PTFE (LPTFE) in the form of an aqueous dispersion having a mean particle size of less than 1.0 microns (?m) and a first melt temperature (Tm) of 332° C. or less. The second fluoropolymer may be a melt processable fluoropolymer (MPF), such as methylfluoroalkoxy (MFA), fluorinated ethylene propylene (FEP), or perfluoroalkoxy (PFA), for example, in the form of an aqueous dispersion having a mean particle size of less than 1.0 microns (?m). When the blended fluoropolymer composition is dried, a crystal structure representing a true alloy of the fluoropolymers is formed, having melt characteristics that differ from those of the individual fluoropolymers.
    Type: Grant
    Filed: November 15, 2011
    Date of Patent: July 7, 2015
    Assignee: Whitford Corporation
    Inventors: Leonard W. Harvey, Michael Coates, Julie K. Wright
  • Patent number: 8840824
    Abstract: Single, continuous PTFE layers having lateral zones of varied characteristics are described. Some of the lateral zone embodiments may include PTFE material having little or no nodal and fibril microstructure. Methods of manufacturing PTFE layers allow for controllable permeability and porosity of the layers, in addition to other characteristics. The characteristics may vary from one lateral zone of a PTFE layer to a second lateral zone of a PTFE layer. In some embodiments, the PTFE layers may act as a barrier layer in an endovascular graft or other medical device.
    Type: Grant
    Filed: October 22, 2010
    Date of Patent: September 23, 2014
    Assignee: Trivascular, Inc.
    Inventors: Joseph W. Humphrey, Jeffry B. Skiba
  • Patent number: 8784710
    Abstract: A method of making an expanded polytetrafluoroethylene (ePTFE) membrane including the steps of: providing an unsintered or partially sintered ePTFE membrane; matting the unsintered or partially sintered ePTFE membrane; and immediately thereafter, sintering the matted ePTFE membrane. A method for making ePTFE tubes includes the steps of: providing an unsintered or partially sintered ePTFE membrane; wrapping the ePTFE membrane around a mandrel or form tool to form an ePTFE tube; matting the ePTFE tube; immediately thereafter, sintering the matted ePTFE tube; and removing the sintered ePTFE tube from the mandrel or form tool.
    Type: Grant
    Filed: March 18, 2010
    Date of Patent: July 22, 2014
    Assignee: Phillips Scientific Inc.
    Inventors: Douglas R. Hansen, James V. Phillips
  • Patent number: 8728372
    Abstract: Thin PTFE layers are described having little or no node and fibril microstructure and methods of manufacturing PTFE layers are disclosed that allow for controllable permeability and porosity of the layers. In some embodiments, the PTFE layers may act as a barrier layer in an endovascular graft or other medical device.
    Type: Grant
    Filed: October 29, 2010
    Date of Patent: May 20, 2014
    Assignee: TriVascular, Inc.
    Inventors: Joseph W. Humphrey, Jeffrey B. Skiba
  • Patent number: 8728993
    Abstract: A PTFE-based composite material includes a PTFE major phase filled with a metal oxide minor phase. The major phase is intermixed with the metal oxide minor phase, wherein the minor phase includes a plurality of irregularly shaped metal oxide nanoparticles. The irregularly shaped nanoparticles provide substantial reductions in steady state wear rate over otherwise similar nanocomposites. The metal oxide can comprise aluminum oxide.
    Type: Grant
    Filed: January 11, 2013
    Date of Patent: May 20, 2014
    Assignee: University of Florida Research Foundation, Inc.
    Inventors: W. Gregory Sawyer, David L. Burris
  • Patent number: 8715559
    Abstract: A tetrafluoroethylene resin molded article obtained by fusing PTFE by heating a tetrafluoroethylene resin by heating, and then executing a gradual cooling or a cooling including a holding at a temperature equal to or higher than 313° C. and lower than 321° C. for 10 minutes or longer, and having, when heated to 365° C., then cooled to 245° C. with a rate of ?1° C./min, and then heated to 365° C. with a rate of 10° C./min, a heat of fusion which, within a range from 296 to 343° C., is equal to or larger than 32 J/g and less than 47.8 J/g, a porous article obtained by expanding the molded article, and a composite article, a filter, an impact deformation absorber and a sealing material utilizing the molded article or the porous article.
    Type: Grant
    Filed: September 8, 2006
    Date of Patent: May 6, 2014
    Assignee: Sumitomo Electric Fine Polymer, Inc.
    Inventors: Fumihiro Hayashi, Shinichi Kanazawa, Atsushi Uno, Akira Udagawa, Shigetoshi Ikeda, Toshiaki Yagi
  • Patent number: 8685424
    Abstract: A method of preparing antimicrobial-containing polymeric products is provided, the method involving electrospinning a dispersion comprising a dispersible polymer, a fiberizing polymer, and one or more antimicrobial agents. The electrospun material is heated to remove solvent and the fiberizing polymer, giving a nonwoven polymeric material having antimicrobial agent incorporated therein. The material can be in the form of, for example, a non-woven sheet, tube, or covering.
    Type: Grant
    Filed: October 13, 2011
    Date of Patent: April 1, 2014
    Assignee: Zeus Industrial Products, Inc.
    Inventors: Robert L. Ballard, Bruce L. Anneaux, Joshua L. Manasco
  • Patent number: 8628843
    Abstract: The present invention provides sintered composite polymeric materials and methods of making and using the same. The sintered composite polymeric materials are made by sintering composite particles comprising a polytetrafluoroethylene component and a carbonaceous component, wherein the carbonaceous component is dispersed throughout the polytetrafluoroethylene component.
    Type: Grant
    Filed: October 23, 2009
    Date of Patent: January 14, 2014
    Assignee: Porex Corporation
    Inventor: Andrew James MacLennan
  • Patent number: 8609249
    Abstract: A method for making a thin walled ePTFE tube having improved axial and radial strength includes the steps of: providing an unsintered or partially sintered ePTFE membrane; wrapping the ePTFE membrane around a mandrel or form tool to form an ePTFE tube; matting the ePTFE tube; immediately thereafter, sintering the matted ePTFE tube; removing the sintered ePTFE tube from the mandrel or form tool; stretching the sintered ePTFE tube in the axial direction; stretching the ePTFE tube in the radial direction over a second mandrel that is greater in diameter than the reduced axially stretched diameter, but less than the first mandrel diameter; overwrapping the second mandrel with a second ePTFE membrane; matting the ePTFE tube; immediately thereafter, sintering the matted ePTFE tube; and removing the sintered ePTFE tube from the second mandrel or form tool.
    Type: Grant
    Filed: July 20, 2011
    Date of Patent: December 17, 2013
    Assignee: Phillips Scientific Inc.
    Inventors: Douglas R. Hansen, James V. Phillips
  • Patent number: 8383561
    Abstract: A PTFE-based composite material includes a PTFE major phase filled with a metal oxide minor phase. The major phase is intermixed with the metal oxide minor phase, wherein the minor phase includes a plurality of irregularly shaped metal oxide nanoparticles. The irregularly shaped nanoparticles provide substantial reductions in steady state wear rate over otherwise similar nanocomposites. The metal oxide can comprise aluminum oxide.
    Type: Grant
    Filed: August 24, 2010
    Date of Patent: February 26, 2013
    Assignee: University of Florida Research Foundation, inc.
    Inventors: W. Gregory Sawyer, David L. Burris
  • Patent number: 8377352
    Abstract: A medical catheter tube containing a tetrafluoroethylene polymer, which has a wall thickness of 0.1 mm or below and exhibits a tensile strength (S1) at 1.0 mm displacement of 5.0 N/mm or above; and a process for the production of medical catheter tubes, characterized by molding a composition both a tetrafluoroethylene polymer and a lubricant having high affinity for the polymer by paste extrusion. The invention provides thin-wall medical catheter tubes excellent in elongation resistance, kink resistance and internal cavity lubricity.
    Type: Grant
    Filed: March 29, 2011
    Date of Patent: February 19, 2013
    Assignee: Kaneka Corporation
    Inventors: Satoshi Inamoto, Fumihiko Nakao, Mitsuharu Korogi, Tsuyoshi Mihayashi
  • Patent number: 8354619
    Abstract: An electric wire comprises a non-oxidized conductor of copper alloy having no outer coating and in direct contact with a PTFE-based sheath. It is fabricated as follows: providing a copper alloy conductor without an outer coating; forming a sheath of a PTFE-based material around the conductor; and heating the wire in order to evaporate the lubricant and sinter the sheath. In order to avoid oxidizing the copper during the heating step, the wire is heated mainly in an atmosphere having a low oxygen content. The lubricant evaporation and/or sintering line for stabilizing the sheath of the electric wire comprises one or more ovens, each having an enclosure in which an atmosphere having a low oxygen content is maintained.
    Type: Grant
    Filed: July 12, 2010
    Date of Patent: January 15, 2013
    Assignee: Axon'Cable
    Inventor: Sophie Perez
  • Patent number: 8298462
    Abstract: This invention relates to a method of uniaxially expanding a fluoropolymer product including the steps of expanding a green fluoropolymer product in a first direction to create a first-expanded fluoropolymer product, and expanding the first-expanded fluoropolymer product in the same first direction. As a result with the subject invention, it has been found that ultra-high expansion and a variety of different porous/fibril structures can be achieved by using subsequent expansion steps in the same direction. Various considerations exist with such methodology, including the selection of rates of expansion of both steps, the amount of expansion of both steps, pre-heating and cutting the product between expansion steps. Although the present invention can be used with various fluoropolymer products, it is particularly well-suited for use with PTFE.
    Type: Grant
    Filed: December 30, 2004
    Date of Patent: October 30, 2012
    Assignee: Boston Scientific Scimed, Inc.
    Inventors: Michael Luk, Jeff Sewell, Jason Hill
  • Patent number: 8231974
    Abstract: A fluoropolymer molding method and the resulting molded article are disclosed where the fluoropolymer is composed of fluoropolymer particles each having a multi-layer structure that consists of at least two types of fluoropolymers having different melting points, with at least one inner layer made of a fluoropolymer with a melting point higher than that of the outermost fluoropolymer. The fluoropolymer of the at least one inner layer is molded at a temperature higher than the melting point of the lowest melting point of the fluoropolymers that form the outermost layers of the multi-layer-structure fluoropolymer particles, and lower than the melting point of the fluoropolymer having the highest melting point. The resulting articles have excellent chemical liquid resistance and gas impermeability and low linear expansion coefficient.
    Type: Grant
    Filed: March 15, 2012
    Date of Patent: July 31, 2012
    Assignee: Dupont Mitsui Fluorochemicals Co Ltd
    Inventor: Takao Nishio
  • Patent number: 8187534
    Abstract: The present invention provides porous barrier compositions comprising color change indicators and methods of making and using the same.
    Type: Grant
    Filed: February 12, 2008
    Date of Patent: May 29, 2012
    Assignee: Porex Corporation
    Inventor: Guoqiang Mao
  • Patent number: 8178030
    Abstract: An improved process for forming a PTFE mat is described. The process includes providing a dispersion with PTFE, a fiberizing polymer and a solvent wherein said dispersion has a viscosity of at least 50,000 cP. An apparatus is provided which comprises a charge source and a target a distance from the charge source. A voltage source is provided which creates a first charge at the charge source and an opposing charge at the target. The dispersion is electrostatically charged by contact with the charge source. The electrostatically charged dispersion is collected on the target to form a mat precursor which is heated to remove the solvent and the fiberizing polymer thereby forming the PTFE mat.
    Type: Grant
    Filed: January 19, 2010
    Date of Patent: May 15, 2012
    Assignee: Zeus Industrial Products, Inc.
    Inventors: Bruce L. Anneaux, Robert Ballard, David P. Garner
  • Patent number: 8158260
    Abstract: A fluoropolymer molding method and the resulting molded article are disclosed where the fluoropolymer is composed of fluoropolymer particles each having a multi-layer structure that consists of at least two types of fluoropolymers having different melting points, with at least one inner layer made of a fluoropolymer with a melting point higher than that of the outermost fluoropolymer. The fluoropolymer of the at least one inner layer is molded at a temperature higher than the melting point of the lowest melting point of the fluoropolymers that form the outermost layers of the multi-layer-structure fluoropolymer particles, and lower than the melting point of the fluoropolymer having the highest melting point. The resulting articles have excellent chemical liquid resistance and gas impermeability and low linear expansion coefficient.
    Type: Grant
    Filed: May 29, 2007
    Date of Patent: April 17, 2012
    Assignee: Dupont Mitsui Fluorochemicals Co Ltd
    Inventor: Takao Nishio
  • Patent number: 8158041
    Abstract: Extruded, stretched, sintered tubular PTFE materials are produced which are suited for use in the medical field as liners and covers for expandable stents. The PTFE materials have an unusually low REC (Radial Expansion Coefficient) and RER (Radial Expansion Ratio).
    Type: Grant
    Filed: December 28, 2007
    Date of Patent: April 17, 2012
    Assignee: Bard Peripheral Vascular, Inc.
    Inventor: William M. Colone
  • Patent number: 8153041
    Abstract: To provide a membrane capable of efficiently collecting fine particles for a long period of time, disclosed is a polytetrafluoroethylene microporous membrane wherein the mean pore size in the surface of the membrane is larger than the mean pore size in the back thereof and the mean pore size continuously changes from the surface toward the back.
    Type: Grant
    Filed: November 11, 2010
    Date of Patent: April 10, 2012
    Assignee: FUJIFILM Corporation
    Inventors: Hidetaka Okada, Kouhei Kawahara, Toshiki Taguchi
  • Patent number: 8141717
    Abstract: The present invention provides sintered polymeric materials and methods of making the same which are useful in a variety of applications. In one embodiment, the present invention provides a sintered polymeric material comprising at least one plastic and at least one elastomer.
    Type: Grant
    Filed: August 20, 2007
    Date of Patent: March 27, 2012
    Assignee: Porex Corporation
    Inventors: James P. Wingo, Michael E. Witover, Guoqiang Mao, Andre Maertens, Gerald Kunth, Daniel George Fullerton, Ike Iaokim Haldopoulos, Take Huat Tan, Deborah B. Reed
  • Patent number: 8007700
    Abstract: An electric cable for conveying signals, the cable having a diameter of less than 2 mm and comprising at least one conductor in an insulating sheath, the sheath having a dielectric constant ? of less than 1.7. To achieve this, the sheath is made of PTFE and it includes at least one continuous cell.
    Type: Grant
    Filed: August 1, 2008
    Date of Patent: August 30, 2011
    Assignee: Axon'Cable
    Inventor: Sophie Perez
  • Patent number: 7985361
    Abstract: A process for dispersion spinning non-melt-processible fluoropolymer fiber in which a mixture of an aqueous dispersion of non-melt-processible polytetrafluoroethylene or modified polytetrafluoroethylene fluoropolymer particles and an aqueous solution of matrix polymer is formed. The non melt-processible particles have an SSG of less than about 2.40. The aqueous dispersion contains an aliphatic alcohol ethoxylate nonionic surfactant having a 20% residuals temperature determined by thermogravimetric analysis (TGA) of less than about 290° C. and is essentially free of surfactants containing aromatic groups. The dispersion has a fluorinated surfactant content of less than about 300 ppm. The mixture is extruded into a coagulation bath containing a concentration of ions which coagulate the matrix polymer to form an intermediate fiber structure. The intermediate fiber structure is sintered to decompose the matrix polymer and coalesce.
    Type: Grant
    Filed: May 21, 2008
    Date of Patent: July 26, 2011
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Devin Flowers, Clay Woodward Jones, Robert John Cavanaugh
  • Patent number: 7976751
    Abstract: An expanded porous polytetrafluoroethylene film having residual strain of at most 11.0% as measured after a load required to indent a rod, which is in a columnar form that its outer diameter is at least 2 mm and at least 1.9 times as much as the thickness of the film, and has a smooth plane perpendicular to its axis at a free end surface thereof and a modulus of longitudinal elasticity of at least 1.0×104 kgf/mm2, up to 20% of the film thickness at a strain rate of 100%/min from the free end surface is applied repeatedly 20 times, and a production process of the porous film, in which a step of compressing an expanded porous polytetrafluoroethylene film having a high draw ratio is provided.
    Type: Grant
    Filed: February 19, 2009
    Date of Patent: July 12, 2011
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Fumihiro Hayashi, Yasuhiro Okuda
  • Patent number: 7942275
    Abstract: A method of making a porous membrane includes, in an exemplary embodiment, mixing together a first fine powder PTFE resin and a second fine powder PTFE resin to form a PTFE resin mixture. The first PTFE resin having a characteristic of forming more and longer fibrils than fibrils formed from the second PTFE resin. The second PTFE resin having a characteristic of forming thicker nodes than nodes formed from the first PTFE resin. The method also includes forming a preform from the PTFE resin mixture, extruding the preform into a tape, passing the tape through a plurality of opposing calender rolls to form a calendered tape having a thickness of about 380 ?m to about 1200 ?m, and stretching the calendered tape in the transverse direction to form a porous membrane having a plurality of nodes and fibrils and having a thickness of at least about 100 ?m.
    Type: Grant
    Filed: July 8, 2008
    Date of Patent: May 17, 2011
    Assignee: BHA Group, Inc.
    Inventor: Gopakumar Thottupurathu
  • Patent number: 7927525
    Abstract: A process of manufacturing micro or nanostructure surfaces or parts formed of PTFE by applying a vacuum to powered or granulated PTFE in a heated compression mold. The process further includes applying a compression anvil within the metallic mold, removing the mold from a heat source and quenching the mold while maintaining the pressure in the mold during quenching. A mold or mold insert may be manufactured from sintered metal, sintered ceramic or sintered stainless steel to allow the vacuum to be applied across a surface holding the micro or nanostructures.
    Type: Grant
    Filed: August 22, 2008
    Date of Patent: April 19, 2011
    Inventors: Todd E. Lizotte, Orest Ohar
  • Patent number: 7872073
    Abstract: A process is disclosed for dispersion spinning non-melt-processible fluoropolymer fiber in which a mixture of an aqueous dispersion of non-melt-processible fluoropolymer particles and an aqueous solution of a matrix polymer is formed. The non-melt-processible fluoropolymer particles have an SSG of less than about 2.40 and comprise a core of high molecular weight polytetrafluoroethylene and a shell of lower molecular weight polytetrafluoroethylene or modified polytetrafluoroethylene. The mixture is extruded into a coagulation bath containing a concentration of ions which coagulate the matrix polymer to form an intermediate fiber structure. The intermediate fiber structure is sintered to decompose the matrix polymer and coalesce the non-melt-processible fluoropolymer particles to form the fiber. The present invention also provides a spinning composition useful for the dispersion spinning of non-melt-processible fluoropolymer fiber.
    Type: Grant
    Filed: January 25, 2008
    Date of Patent: January 18, 2011
    Assignee: E.I. du Pont de Nemours and Company
    Inventor: Clay Woodward Jones
  • Patent number: 7868083
    Abstract: A material comprising aerogel particles and a polytetrafluoroethylene (PTFE) binder is formed having a thermal conductivity of less than or equal to 25 mW/m K at atmospheric conditions. The material is moldable or formable, having little or no shedding of filler particles, and may be formed into structures such as tapes or composites, for example, by bonding the material between two outer layers. Advantageously, composites may be flexed, stretched, or bent without significant dusting or loss of insulating properties.
    Type: Grant
    Filed: January 11, 2008
    Date of Patent: January 11, 2011
    Assignee: Gore Enterprise Holdings, Inc.
    Inventors: Cedomila Ristic-Lehmann, Brian Farnworth, Anit Dutta, Bradley E. Reis
  • Patent number: 7811490
    Abstract: A composition is provided that, in one aspect, may be used in the production of sealing materials, such as gaskets. The composition includes a polytetraflouroethylene matrix and a Boron Nitride filler. In one aspect, the Boron Nitride filler may be provided as a hexagonal, close-packed, Boron Nitride filler that is homogeneously dispersed within the polytetraflouroethylene matrix. In at least one embodiment, the composition is formed by combining quantities of polytetraflouroethylene, Boron Nitride filler, hydrocarbon liquid, and solvent. The liquid and solvent may be removed through various processes prior to sintering the composition to form a full-density, Boron Nitride filled, polytetraflouroethylene matrix that exhibits improved sealability, greater resistance to permeation, and less color contamination.
    Type: Grant
    Filed: February 6, 2008
    Date of Patent: October 12, 2010
    Assignee: Garlock Sealing Technologies, Inc.
    Inventor: Ameet Kulkarni
  • Patent number: 7790658
    Abstract: A PTFE-based composite material includes a PTFE major phase filled with a metal oxide minor phase. The major phase is intermixed with the metal oxide minor phase, wherein the minor phase includes a plurality of irregularly shaped metal oxide nanoparticles. The irregularly shaped nanoparticles provide substantial reductions in steady state wear rate over otherwise similar nanocomposites. The metal oxide can comprise aluminum oxide.
    Type: Grant
    Filed: May 30, 2006
    Date of Patent: September 7, 2010
    Assignee: University of Florida Research Foundaction, Inc.
    Inventors: W. Gregory Sawyer, David L. Burris
  • Patent number: 7754121
    Abstract: A material comprising aerogel particles and a polytetrafluoroethylene (PTFE) binder is formed having a thermal conductivity of less than or equal to 25 mW/m K at atmospheric conditions. The material is moldable or formable, having little or no shedding of filler particles, and may be formed into structures such as tapes or composites, for example, by bonding the material between two outer layers. Advantageously, composites may be flexed, stretched, or bent without significant dusting or loss of insulating properties.
    Type: Grant
    Filed: April 5, 2007
    Date of Patent: July 13, 2010
    Assignee: Gore Enterprise Holdings, Inc.
    Inventors: Cedomila Ristic-Lehmann, Brian Farnworth, Anita Dutta
  • Patent number: 7744792
    Abstract: The subject invention pertains to methods for processing polytetrafluoroethylene (PTFE) resin into highly desirable product forms that fill the needs of the fluoropolymer industry. The subject invention concerns methods for making a multi-directional planar oriented PTFE resin structure. PTFE produced by methods of the present invention will challenge or exceed the capabilities of melt processable resins and accomplish many of the goals not previously realized by the fluoropolymer industry. The subject invention also concerns methods for preparing PTFE resin primary colloidal particles. The subject invention also concerns the PTFE primary colloidal particles produced by the methods and products utilizing the particles.
    Type: Grant
    Filed: January 31, 2007
    Date of Patent: June 29, 2010
    Inventor: Robert Roberts
  • Patent number: 7740781
    Abstract: The invention provides an insulated wire having a conductor and an insulator of paste extruded PTFE fine powder around the conductor. The paste extruded insulator has at least one closed continuous longitudinal air channel spaced apart from the conductor. The invention further provides a process for forming an insulator around a conductor by paste extruding lubricated PTFE fine powder in an extrusion device comprising a die, mandrel, and at least one channel-forming member. The die and mandrel form a converging chamber leading to an extrusion orifice and the channel-forming member is positioned in the orifice. The mandrel has a central bore for supplying the conductor. Lubricated PTFE fine powder is forced through the chamber and out of the exit of the orifice as a lubricated green extrudate around the conductor forming an insulator with at least one closed longitudinal air channel spaced apart from the conductor.
    Type: Grant
    Filed: September 20, 2006
    Date of Patent: June 22, 2010
    Assignee: E.I. du Pont de Nemours and Company
    Inventors: Daniel L. Levy, Kurt Aeschbach
  • Patent number: 7691299
    Abstract: Disclosed are expanded polytetrafluoroethylene products, such as porous polytetrafluoroethylene tubes, having high axial tear strength and a process for their production. Each expanded polytetrafluoroethylene product has a microstructure, which comprises fibrils and nodes interconnected with each other by the fibrils, and has an axial tear strength of not lower than 6,000 gf/mm as calculated in accordance with the following formula: L/[T×(V/100)] where L (gf) is an axial tear load, T (mm) is a wall thickness, and V (%) is a volume ratio of resin. The process for the production of the expanded polytetrafluoroethylene product includes a high-speed extrusion step.
    Type: Grant
    Filed: May 1, 2003
    Date of Patent: April 6, 2010
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Fumihiro Hayashi, Yasuhiro Okuda, Motomi Nakata, Koichiro Natori