Filaments Patents (Class 264/178F)
  • Patent number: 6127506
    Abstract: A process for melt spinning spandex, utilizing a polyurethaneurea polymer prepared from a purified capped glycol, linear aliphatic diamines and a monoamine chain terminator, is provided.
    Type: Grant
    Filed: February 19, 1999
    Date of Patent: October 3, 2000
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: Robin N. Greene
  • Patent number: 6094769
    Abstract: The invention is directed to a bristle (1) for a toothbrush, in particular for an electric toothbrush, which is comprised of a monofilament (2) made of plastic. The monofilament (2) is of a non-circular cross-section, is twisted about its longitudinal axis, and is fixed as a result of the action of chemical agents. In this manner, the bristle (1) is provided with a three-dimensionally structured surface which effects an improved cleaning action, in particular with regard to the removal of plaque.
    Type: Grant
    Filed: April 1, 1999
    Date of Patent: August 1, 2000
    Assignee: Braun GmbH
    Inventors: Georges Driesen, Ahmet Cem Firatli, Rainer Hans, Norbert Schaefer, Armin Schwarz-Hartmann
  • Patent number: 6036895
    Abstract: A continuous process and apparatus for the production of melt-spun monofilaments having a diameter of 60 .mu.m to 2500 .mu.m from fiber-forming polymers, wherein the polymer melt is spun into air from a spinning head, laterally quenched in a spinning cabinet with a defined air velocity profile and then cooled in a liquid bath.
    Type: Grant
    Filed: June 25, 1998
    Date of Patent: March 14, 2000
    Assignee: Bayer Faser GmbH
    Inventors: Jurgen Budenbender, Eckhard Gartner
  • Patent number: 6017474
    Abstract: Formulation polymer dopes and development of processes for preparing asymmetric polyethersulfone hollow fiber membranes for gas separation are provided. Polyethersulfone hollow fiber membranes which exhibit improved gas permeability and selectivity have been produced from a formulated polymer dope containing N-methyl-2-pyrrolidone (NMP) and suitable nonsolvent-additives (NSA). The nonsolvent-additives are water and the mixture of ethanol and water. The dopes were tailored to be close to the point of phase separation, and have moderate polymer concentration with moderate viscosity. The hollow fibers were spun by the dry-wet phase inversion processes using water as both the internal and external coagulant. The dried hollow fibers are then coated with silicone rubber, a highly permeable material and the coated hollow fiber membranes exhibit excellent permeability and selectivity compared to those of the state-of-the-art polyethersulfone membranes.
    Type: Grant
    Filed: June 19, 1998
    Date of Patent: January 25, 2000
    Assignee: National University of Singapore
    Inventors: Wah Koon Teo, Kang Li, Dongliang Wang
  • Patent number: 6015516
    Abstract: A process for forming ultrathin dense-layer asymmetric hollow fiber membranes with a dense layer of less than 500 .ANG. from a binary solution system comprising a polymer and a solvent. In this process, the spinning polymeric solution has a high viscosity and exhibits chain entanglement at the spinning temperature. The solubility parameter difference between the bore fluid and the spinning dope is less than 2.5 (cal/cm.sup.3).sup.0.5 and the volume ratio of bore-fluid flow rate to the dope flow rate is between 0.45 to 0.75. The dope is wet-spun into hollow fibers using water as external coagulant. The ultrathin dense-layer asymmetric hollow fiber membranes are suitable for air and other gas separations.
    Type: Grant
    Filed: June 19, 1998
    Date of Patent: January 18, 2000
    Assignee: National University of Singapore
    Inventors: Tai-Shung Chung, Xudong Hu, Soo Khean Teoh
  • Patent number: 5961906
    Abstract: The use of dispersions of polyurethanes containing urea groups and based on selected starting materials, optionally via the intermediate stage of granules obtained by spray drying the dispersions, for the production of fully biodegradable shaped bodies.
    Type: Grant
    Filed: November 4, 1997
    Date of Patent: October 5, 1999
    Assignee: Bayer Aktiengesellschaft
    Inventors: Hanns-Peter Muller, Jochen Kalbe, Rainhard Koch
  • Patent number: 5952434
    Abstract: The invention relates to synthetic yarns spun from suophuric acid anistropic solutions of rigid aromatic polyamides blended with aliphatic polyamides. Disclosed is a spinning dope composition comprising an aromatic polyamide, an aliphatic polyamide and concentrated sulphuric acid, wherein at least one of the aromatic and aliphatic plyamides is a copolymer composed of two aromatic and two aliphatic homopolymer units, respectiveyl; the aromatic copolymer having the formula: ?.paren open-st.(HN C.sub.6 H.sub.4 --HH CO C.sub.6 H.sub.4 CO.paren close-st.u.paren open-st.NH C.sub.6 H.sub.4 NH CONH C.sub.6 H.sub.4 NH CO C.sub.6 H.sub.4 CO.paren close-st.w!, wherein u=75-95 wt. % and w=5-25 wt. % and the aliphatic copolymer has the formula ?.paren open-st.HN(CH.sub.2).sub.6 --NHCO(CH.sub.2).sub.4 CO.paren close-st.n.paren open-st.HN(CH.sub.2).sub.5 CO.paren close-st.m wherein n=95-50 wt. % and m=5-50 wt. %.
    Type: Grant
    Filed: January 9, 1998
    Date of Patent: September 14, 1999
    Assignee: Vserossiisky Nauchno-Issledovatedlsky Institut Polimernykh Volokon S Opytnym Zavodom (Vniipv)
    Inventors: Tatyana Sergeevna Sokolova, Vera Dmitrievna Kalmykova, Vera Nikolaevna Sheptukhina, Ljudmila Dmitrievna Serova, Tatyana Andreevna Rozhdestvenskaya, Vladimir Nikolaevich Kiya-Oglu, Alexandra Vasilievna Volokhina, Ljubov Yakovlevna Tikanova, Georgy Ivanovich Kudryavtsev, deceased
  • Patent number: 5938999
    Abstract: A wet-spinning fiber process which controls the micro-structure of the wepun fiber by varying the non-solvent/solvent miscibility and precipitation strength.
    Type: Grant
    Filed: February 14, 1997
    Date of Patent: August 17, 1999
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Leonard J. Buckley, Mark Eashoo
  • Patent number: 5922259
    Abstract: There is provided a cord of twisted polybenzazole fibers, which has a tenacity of 35 g/d or higher and an elastic modulus of 800 g/d or higher. The cord has not only remarkably improved fatigue resistance but also excellent mechanical characteristics at a high level that has not been achieved so far. Therefore, it can attain the weight reduction of composite materials, particularly in the field of reinforced rubber materials, and can also make a great contribution to the energy saving.
    Type: Grant
    Filed: July 18, 1996
    Date of Patent: July 13, 1999
    Assignee: Toyo Boseki Kabushiki Kaisha
    Inventors: Yukinari Okuyama, Hiroshi Hirahata, Kazuyuki Yabuki
  • Patent number: 5911930
    Abstract: A fiber containing an organic acid salt of an intrinsically conductive polymer distributed throughout a matrix polymer along with a method for providing such fibers by spinning a solution which includes an organic acid salt of an intrinsically conductive polymer, a matrix polymer and a spinning solvent into a coagulation bath including a nonsolvent for both the organic acid salt of an intrinsically conductive polymer and the matrix polymer. The intrinsically conductive polymer-containing fibers typically have electrical conductivities below about 10.sup.-5 S/cm.
    Type: Grant
    Filed: August 25, 1997
    Date of Patent: June 15, 1999
    Assignee: Monsanto Company
    Inventors: Patrick J. Kinlen, Bruce G. Frushour
  • Patent number: 5910274
    Abstract: Improved anisotropic fluid separation membranes are prepared from blends of polymers with surface energy differences. The membranes are formulated by processes wherein low surface energy polymer with desirable fluid separation and permeation characteristics is preferentially concentrated in the surface discriminating layer of the membrane.
    Type: Grant
    Filed: September 4, 1997
    Date of Patent: June 8, 1999
    Assignee: Praxair Technology, Inc.
    Inventors: James Timothy Macheras, Benjamin Bikson, Joyce Katz Nelson
  • Patent number: 5840828
    Abstract: A polyimide fiber having textile physical property characteristics and the process of melt extruding same from a polyimide powder. Polyimide powder formed as the reaction product of the monomers 3,4'-ODA and ODPA, and endcapped with phthalic anhydride to control the molecular weight thereof, is melt extruded in the temperature range of C. to C. and at heights of 100.5 inches, 209 inches and 364.5 inches. The fibers obtained have a diameter in the range of 0.0068 inch to 0.0147 inch; a mean tensile strength in the range of 15.6 to 23.1 ksi; a mean modulus of 406 to 465 ksi; and a mean elongation in the range of 14 to 103%.
    Type: Grant
    Filed: May 7, 1997
    Date of Patent: November 24, 1998
    Assignee: The United States of America as represented by the Administrator of the National Aeronautics and Space Administration
    Inventors: Terry L. St. Clair, Catharine C. Fay, Dennis C. Working
  • Patent number: 5824767
    Abstract: A process for improving the processability of poly(arylene sulfide) in melt spinning operations by treatment with a barium-containing compound and, optionally, a lubricant is disclosed.
    Type: Grant
    Filed: July 8, 1996
    Date of Patent: October 20, 1998
    Assignee: Hoechst Celanese Corporation
    Inventors: Balaram B. Gupta, Andrew B. Auerbach, Barrie L. Davies
  • Patent number: 5804120
    Abstract: Celluloe extrudates can be made from an optically anisotropic solution containing 94-100 wt % of: cellulose; phosphoric acid and/or its anhydrides; and water by extruding the solution, coagulating the formed extrudates, and then aftertreating those extrudates so that they have a degree of acidity which at least equals 7. Fibres obtained by such a process possess particularly good thermal stability and are suitable for use as a reinforcing material.
    Type: Grant
    Filed: February 19, 1997
    Date of Patent: September 8, 1998
    Assignee: Akzo Nobel N.V.
    Inventors: Hanneke Boerstoel, Marco Ypma
  • Patent number: 5762798
    Abstract: An asymmetrical, microporous, hollow fiber membrane is made from a polymeric dope mixture of polysulfone and polyvinyl pyrrolidone dissolved in an aprotic solvent. The physical morphology of the hollow fiber membrane, i.e., the asymmetric microporous wall, is rapidly formed by passing the polymeric dope mixture through an outer annular orifice of a tube-in-orifice spinneret while simultaneously passing a precipitating solution through the central tube of the spinneret. The emerging hollow fiber travels substantially downward for about 0.01-10 m before submersion into a quenching bath. The asymmetrical, microporous, hollow fiber membrane is biocompatible and suitable for use in, for example, dialysis, hemodialysis, ultrafiltration, and water filtration applications.
    Type: Grant
    Filed: May 6, 1993
    Date of Patent: June 9, 1998
    Assignee: Minntech Corporation
    Inventors: Randal M. Wenthold, Robert T. Hall, II, Robert G. Andrus, Paul D. Brinda, Louis C. Cosentino, Robert F. Reggin, Daniel T. Pigott
  • Patent number: 5762846
    Abstract: A process for spinning a fully water washed fluorinated olefinic polymer intermediate fiber structure from a mixture of an aqueous dispersion of particles of the fluorinated olefinic polymer and a solution of a cellulosic ether.
    Type: Grant
    Filed: December 20, 1996
    Date of Patent: June 9, 1998
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Nicole Lee Blankenbeckler, Joseph Michael Donckers, II, Warren Francis Knoff
  • Patent number: 5723081
    Abstract: A process for preparing a dispersion spun fluorinated polymer fiber wherein the intermediate fiber structure, immediately before sintering, contains primarily ions characterized as fugitive ions.
    Type: Grant
    Filed: December 20, 1996
    Date of Patent: March 3, 1998
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Nicole Lee Blankenbeckler, Joseph Michael Donckers, II, Warren Francis Knoff
  • Patent number: 5720838
    Abstract: A doormat is formed by accumulating a large number of monofilaments in a random loop form continuously to present a mottled pattern or a striped pattern by the combination of color monofilaments of two or more colors. This manufacturing device comprises a spinning pack having a rectangular shape for spinning a large number of monofilaments, a plurality of extruders disposed at symmetrical positions in the longitudinal direction of the spinning pack, and a collecting mechanism for collecting the monofilaments spun from the spinning pack. The spinning pack is provided with a resin flowpath unit and a multihole nozzle plate which are superposed, and the resin flowpath unit is connected to the extruders by means of communicating pipe lines disposed at symmetrical positions in the longitudinal direction.
    Type: Grant
    Filed: February 29, 1996
    Date of Patent: February 24, 1998
    Assignee: Yugengaisya Towa
    Inventor: Akira Nakata
  • Patent number: 5714258
    Abstract: An improved polyester fiber, polymer composition for producing such fibers by spinning and drawing, and a process for improving the production of fibers from polyester is disclosed wherein an aliphatic diester such as ethylene glycol distearate is incorporated into the polyester resin prior to spinning fibers from the resin in trace amounts of from about 0.01 to about 0.4 percent by weight of the polyester. The composition improves the process of spinning and drawing fibers from the resin and produces superior fibers.
    Type: Grant
    Filed: December 28, 1995
    Date of Patent: February 3, 1998
    Assignee: Hoechest Celanese Corporation
    Inventor: F. Holmes Simons
  • Patent number: 5691443
    Abstract: Aramids which after drawing have high tensile strengths and tensile moduli are made from units derived from selected 2,2'-disubstituted-4,4'-diaminobiphenyls, p-phenylenediamine, oxydianiline and terephthalic acid. Also disclosed is a process for drawing such aramids at least 1.5%, which results in the drawn aramid having significant crystallinity and higher tensile strength. The aramids are useful for ropes and composites.
    Type: Grant
    Filed: September 8, 1995
    Date of Patent: November 25, 1997
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Robert Samuel Irwin
  • Patent number: 5641450
    Abstract: A hollow polysulfonic fiber intended for a selectively transmissive membrane contains a hydrophilic polymer which is cross-linked into a water-insoluble form (for example polyvinylpyrrolidone) and is used in the form of a hydrogel containing water. A method for the production of a membrane module consists in spinning a hollow fiber by the use of a spinning solution containing a polysulfonic resin and a hydrophilic polymer, wetting the fiber above the saturated moisture content, and then, with the wet condition maintained, subjecting the fiber to the processes of module molding and radiation induced cross-linking, these processes being performed in either order. The method provides a selectively transmissive hollow polysulfone fiber membrane which displays less elution into water and a sharp molecular weight fractionation, so as to be usable safely in the fields of medicine and foodstuffs.
    Type: Grant
    Filed: December 6, 1994
    Date of Patent: June 24, 1997
    Assignee: Toray Industries, Inc.
    Inventors: Takuichi Kobayashi, Kazumi Tanaka
  • Patent number: 5639484
    Abstract: A spinning cell for producing lyocell fibre by spinning a solution of cellulose in an organic solvent through an air gap into a spin bath has nozzles to create a cross-draught through the air gap.
    Type: Grant
    Filed: April 3, 1995
    Date of Patent: June 17, 1997
    Assignee: Courtaulds Fibres (Holdings) Limited
    Inventors: Patrick Arthur White, Malcolm John Hayhurst, Alan R. Owens, Ian David Roughsedge, Richard James Davies, Alan Sellars, Jacqueline Faye MacDonald, Michael Colin Quigley, Ralph Draper, Ronald Derek Payne
  • Patent number: 5628947
    Abstract: A process for the simultaneous drying and crystallization of crystallizable thermoplastic synthetic material (plastic), e.g. polyethylene terephthalate, in which plastic from the melt is extruded in cord form, solidified at the surface by quenching in water and crystallized by gas treatment and dried, using a device for cooling and drying the cord emerging from dies having a casting gutter with its acceptance end arranged beneath the dies and a device producing a flow of coolant on the casting gutter within a quenching section, a subsequent dewatering section in which the casting gutter has apertures for the free flow of the coolant, a subsequent drying section in which the casting gutter has closely spaced nozzles for the passage of gas and a granulator downstream of the drying section. The lengths of the quenching, dewatering and drying sections must be such, taking account of the rate of creep of the cord along the casting gutter, that the passage time in the quenching section is a maximum of some 1.
    Type: Grant
    Filed: February 15, 1995
    Date of Patent: May 13, 1997
    Assignee: Rieter Automatik GmbH
    Inventor: Jurgen Keilert
  • Patent number: 5626703
    Abstract: The present invention relates to a method for preparing a composite material comprising a matrix resin of a thermal plastic resin and a liquid crystal resin which has a liquid crystal transition temperature higher than the minimum temperature of capable of molding said thermal plastic resin and which is formed into a fiber structure as a reinforcing material.The method is characterized in that the composite composition is subjected to a melt extrusion process at an apparent shear rate of 3.times.10.sup.2 to 10.sup.5 sec.sup.-1 and above the liquid crystal transition temperature. The resulting material in a filament or thin film has fibers of the liquid crystal resin having an aspect of more than 3 in the matrix resin, so that it is provided with an improved tensile strength by further being subjected to a drawing process at a drawing ratio of 11 to 120.
    Type: Grant
    Filed: January 21, 1993
    Date of Patent: May 6, 1997
    Assignee: Mazda Motor Corporation
    Inventors: Takashi Tomita, Masakatsu Ohsugi, Yushi Matsuda, Mitsuharu Kaneko, Keita Sasaki, Kazuhisa Toh, Masayasu Nishihara, Kenji Moriwaki
  • Patent number: 5607700
    Abstract: A synthetic resin pelletizing machine includes an extrusion cylinder forming, with a horizontal plane, an installation angle .theta. which is in the range of<.theta.<, a raw material feed passage extending upwardly from said extrusion cylinder at a predetermined angle relative to a longitudinal axis of said extrusion cylinder, and a cooling unit disposed below a die head and having a double bath construction composed of a first cooling bath and a second cooling bath disposed in the first cooling bath. The pelletizing machine thus constructed is compact in size and is capable of assuring a smooth feed of a raw material to the extrusion cylinder as well as a smooth passage of an extruded strand through the cooling unit.
    Type: Grant
    Filed: April 15, 1994
    Date of Patent: March 4, 1997
    Assignee: YKK Corporation
    Inventors: Akiyoshi Kando, Hiroshi Yoshida, Kazuki Kuse
  • Patent number: 5601856
    Abstract: The heat transmission from the heating box of a spinning beam to the nozzle package carried therein in a nozzle throat is improved in such a way that the fixing device for the package is provided with heat receiving elements. These elements are subjected to saturated vapor in operation and are provided with condensation surfaces so as to receive heat from the saturated vapor. The heat received is transmitted to the package via at least one heat bridge.
    Type: Grant
    Filed: April 11, 1995
    Date of Patent: February 11, 1997
    Assignee: Rieter Automatik GmbH
    Inventors: Willi Kretzschmar, Erik Ortmayer
  • Patent number: 5587122
    Abstract: We have discovered a process for producing a polypropylene suture including the steps of (a) extruding melted polypropylene resin through an orifice and rapidly quenching the melted polypropylene resin to produce a filament; (b) drawing the filament in the range of from about 5.times. to about 7.5.times. to produce a singly drawn filament; (c) drawing the singly drawn filament in the range of form about 1.times. to about 2.5.times. in a second heated zone being maintained at a temperature in the range of from about C. to about C., to form a doubly drawn filament; (d) shrinking the doubly drawn filament in the range of from about 0.75 percent to about 0.95 percent, in a second heated zone being maintained at a temperature in the range of from about C. to about C., to form a polypropylene suture.
    Type: Grant
    Filed: February 10, 1995
    Date of Patent: December 24, 1996
    Assignee: Ethicon, Inc.
    Inventor: David J. Lennard
  • Patent number: 5534205
    Abstract: In a process for preparing polybenzoxazole or polybenzothiazole filaments by extruding a polybenzoxazole or polybenzothiazole dope, drawing the dope filament across an air gap, and coagulating the dope filament; the number of filament breaks can be reduced by placing a stress isolation device after extruding but before coagulating the filament.
    Type: Grant
    Filed: August 5, 1994
    Date of Patent: July 9, 1996
    Assignee: The Dow Chemical Company
    Inventors: Timothy L. Faley, Michael E. Mills, Yoshihiko Teramoto, Douglas E. Turek, Kazuyuki Yabuki
  • Patent number: 5518670
    Abstract: The invention relates to a continuous process for the formation of monofilaments having a diameter of from 60 .mu.m to 500 .mu.m from filament-forming polymers by melt-spinning the polymer, optionally quenching the formed polymer filaments below the melt-spinning head with a cooling medium, cooling the filaments in a liquid bath having a temperature of from C. to C., removing the entrained water and post-treating the filaments by spin finishing, drawing and fixing at a filament delivery speed which is greater than 600 to 4000 m/min after the fixing step.
    Type: Grant
    Filed: October 13, 1994
    Date of Patent: May 21, 1996
    Assignee: Bayer Aktiengesellschaft
    Inventors: Jurgen Budenbender, Eckhard Gartner, Jakob Jansen
  • Patent number: 5496510
    Abstract: A process for making acrylic fibers in which control of polymer composition and spin bath composition provide improved product properties.
    Type: Grant
    Filed: August 23, 1994
    Date of Patent: March 5, 1996
    Inventor: Gary J. Capone
  • Patent number: 5476563
    Abstract: A method for making a door mat comprising an integral mass of loops of synthetic resin monofilaments which includes a surface layer having a decorative pattern on its upper side and a reverse surface layer having its upper side joined to the lower side of said surface layer. The underside of the reverse surface layer may be joined to an anti-slip layer, which may be in the form of a lattice layer.
    Type: Grant
    Filed: June 9, 1994
    Date of Patent: December 19, 1995
    Assignee: Yugengaisya Towa
    Inventor: Akira Nakata
  • Patent number: 5470519
    Abstract: A method of manufacturing a cellulosic article of cellulose or a cellulose derivative that has incorporated a polyethylene oxide composition having a molecular weight of at least 70,000.
    Type: Grant
    Filed: July 26, 1994
    Date of Patent: November 28, 1995
    Assignee: Viskase Corporation
    Inventor: John Markulin
  • Patent number: 5464491
    Abstract: A method for producing a mat including a three dimensional filament loop aggregate comprises extruding molten thermoplastic synthetic resin die to form a plurality of filaments. The filaments are heated and descend onto a surface of a cooling liquid, between a pair of rotatable rolls submerged in the cooling liquid. The filaments are all cooled simultaneously by the cooling liquid and form loops on the surface thereof. A first series of loops formed from outermost filaments are supported on one of the rotatable rolls in the cooling liquid, with the loops being horizontal. Rotation of the roll moves these loops into a vertical position. Thereafter, all the loops are integrated, with the loops formed by the outermost filaments being in a vertical position, and the loops formed by the remaining filaments being in the horizontal position.
    Type: Grant
    Filed: August 12, 1993
    Date of Patent: November 7, 1995
    Assignee: Kabushiki Kaisha Risuron
    Inventor: Minoru Yamanaka
  • Patent number: 5451359
    Abstract: High molecular weight polyester fibers having excellent mechanical strength and useful for various industrial materials, is produced by dry-jet wet spinning a dope solution of a polyester resin comprising repeating ethylene terephthalate units, having an intrinsic viscosity of 1.2 or more and dissolved in a phenolic solvent, through a spinneret, coagulating the resultant filamentary dope solution streams in a bath of coagulating liquid in which the phenolic solvent is soluble and the polyester resin is insoluble, while controlling the temperature of the coagulating liquid to a level of from ( C.) to ( C.) wherein Tg represents a glass transition temperature of the dope solution, and optionally subjecting the resultant undrawn polyester filaments to a rinsing step with a rinsing liquid, to a drawing step at a total draw ratio of at least 5, and to a heat-treating step.
    Type: Grant
    Filed: March 15, 1994
    Date of Patent: September 19, 1995
    Assignee: Teijin Limited
    Inventors: Kazuo Yahata, Ryoji Tsukamoto
  • Patent number: 5441394
    Abstract: A device for cooling and granulating molten thermoplastic strands (1) emerging from dies (2) which either drop along the falling line starting at the dies or are guided in an operating position through a coolant bath (9), freely stressed between guide rollers fitted in the bath and then taken into a granulator (4). In the region between the dies and the coolant bath there is a precooling device (5) which carries the plastic strands emerging from the dies and takes them to the coolant bath. Behind the precooling device there is a gripping device (21 ) with opposed clamping rollers (41, 42) which can open and shut and move along a guiding rail to grip the forward ends of the plastic strands after they have been separated by a separator (22) movable through the falling line of the strands. The rollers with the forward ends of the strands are moved along the guiding rail running through the region of the coolant bath as far as the granulator, where they release the strands thereinto.
    Type: Grant
    Filed: April 1, 1994
    Date of Patent: August 15, 1995
    Assignee: Rieter Automatik GmbH
    Inventors: Jurgen Keilert, Frank Glockner, Helmut Meidhof, Laurenz Hohm
  • Patent number: 5389326
    Abstract: Aramid and polybenzimidazole fibers and films of improved flame resistance are obtained by impregnation with tungsten hexachloride.
    Type: Grant
    Filed: May 23, 1994
    Date of Patent: February 14, 1995
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Robert V. Kasowski, Kiu-Seung Lee
  • Patent number: 5374708
    Abstract: Polyimide filaments and polyimide films having great strength, high elastic modulus and high crystallinity and comprising a novel polyimide which can be melt-processed without impairing high crystallinity and which essentially consists of recurring structural units represented by the formula (I): ##STR1## more than 85 mol % the polyimide consists of recurring structural units of the formula (II): ##STR2## and from 0.5 to 15 mol % of the polyimide consists of recurring structural units represented by the formula (III), the formula (II) exclusive, the formula (IV) and/or the formula (V).
    Type: Grant
    Filed: August 8, 1991
    Date of Patent: December 20, 1994
    Assignee: Mitsui Toatsu Chemicals, Incorporated
    Inventors: Shoji Tamai, Masahiro Ohta, Akihiro Yamaguchi, Masumi Saruwatari
  • Patent number: 5367046
    Abstract: A high temperature resistant fiber, especially a polyimide fiber, having a dielectric constant less than 3 is prepared by first reacting 2,2-bis[4-(4-aminophenoxy)phenyl]hexafluoropropane with 2,2-bis(3,4-dicarboxyphenyl)hexafluoropropane dianhydride in an aprotic solvent to form a polyamic acid resin solution. The polyamic acid resin solution is then extruded into a coagulation medium to form polyamic acid fibers, which are thermally cured to their polyimide form. Alternatively, 2,2-bis[4-(4-aminophenoxy)phenyl]hexafluoropropane with 2,2-bis(3,4-dicarboxyphenyl)hexafluoropropane dianhydride to form a polyamic acid, and the polyamic acid is chemically converted to its polyimide form. The polyimide is then dissolved in a solvent to form a polyimide resin solution, and the polyimide resin is extruded into a coagulation medium to form a polyimide wet gel filament. In order to obtain polyimide fibers of increased tensile properties, the polyimide wet gel filaments are stretched at elevated temperatures.
    Type: Grant
    Filed: April 10, 1992
    Date of Patent: November 22, 1994
    Assignee: The United States of America as represented by the Administrator of the National Aeronautics and Space Administration
    Inventors: William E. Dorogy, Jr., Anne K. St. Clair
  • Patent number: 5362430
    Abstract: Molten polyamide filaments are extruded from spinneret capillaries through a gas-filled gap and into a quench bath which contains a heated aqueous liquid. The bath has a nozzle defining a vertically disposed cylindrical passageway with its entrance in the bath below the bath surface. The filaments are converged into a filament bundle at the entrance and withdrawn from the exit of the passageway at a withdrawal speed of about 1500 to about 3500 meters per minute. The polyamide polymer is extruded from the spinneret such that the jet velocity in the spinneret capillaries is between 2 and 10% of the withdrawal speed of the filament from the exit of the nozzle passageway.
    Type: Grant
    Filed: July 16, 1993
    Date of Patent: November 8, 1994
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: John H. Herold, II, Henry Kobsa
  • Patent number: 5340479
    Abstract: A depth filter formed of a plurality of substantially continuous intertwined filaments including a central support zone formed of support filaments having a first diameter and a filter zone formed of filtration filaments having filaments of a second diameter in which the diameters are different or the filaments are constructed of different materials. The invention also relates to an apparatus and a method for making such a depth filter element.
    Type: Grant
    Filed: August 20, 1992
    Date of Patent: August 23, 1994
    Assignee: Osmonics, Inc.
    Inventors: Joseph T. Szczepanski, Thomas M. Aune, Henry J. Schneider
  • Patent number: 5296286
    Abstract: A process for preparing subdenier fibers and structures thereof from isotropic polymer solutions is disclosed. The process comprises extruding a stream of the polymer solution into a chamber, introducing a pressurized gas into the chamber, directing the gas in the flow direction of and in surrounding contact with the stream within the chamber, passing both the gas and the stream into a zone of lower pressure at a velocity sufficient to attenuate the stream and fragment it into fibers, and contacting the fragmented stream in the zone with a coagulating fluid.
    Type: Grant
    Filed: January 11, 1993
    Date of Patent: March 22, 1994
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Steven R. Allen, David M. Gale, Aziz A. Mian, Sam L. Samuels, Hsiang Shih
  • Patent number: 5294395
    Abstract: Thermoplastic monofilament sutures having improved flexibility and handling characteristics are obtained by a melt spinning process which includes the step of drawing the filaments in a heated zone maintained at a temperature above the melting temperature of the filament. The resulting monofilament sutures have a higher elongation and lower modulus than comparable monofilament sutures obtained without the heated drawing step, and are characterized by a crystalline structure which is more highly ordered in the core of the monofilament suture than in a surrounding annular area.
    Type: Grant
    Filed: May 12, 1993
    Date of Patent: March 15, 1994
    Assignee: Ethicon, Inc.
    Inventor: Ephraim Broyer
  • Patent number: 5286435
    Abstract: Fibers of linear polyethylene or polypropylene are solution spun, cooled, dried in hot air and hot drawn. Drying and hot drawing are carried out by passing a moving filament of the wet polymer through a hot air dryer having an air temperature of at least C., preferably at least C., then heating and hot drawing a moving filament of the dried fiber. Optional steps include wet drawing the fiber prior to drying, and solvent exchange of the original solvent, e.g. decalin, for a more volatile solvent.
    Type: Grant
    Filed: December 31, 1987
    Date of Patent: February 15, 1994
    Assignee: Bridgestone/Firestone, Inc.
    Inventors: Leonid I. Slutsker, Kenneth R. Lucas, Georg G. A. Bohm
  • Patent number: 5286833
    Abstract: A process for making PBZ fibers of ultra-high physical properties is given. Polybenzoxazole fibers made by the process of this invention have tensile strengths nearly double in value from what has been reported previously.
    Type: Grant
    Filed: December 3, 1992
    Date of Patent: February 15, 1994
    Assignee: The Dow Chemical Company
    Inventors: Robert A. Bubeck, Stephen J. Nolan, Chieh-Chun Chau, Steven Rosenberg, Mark D. Newsham, Myrna Serrano
  • Patent number: 5279783
    Abstract: A process for manufacturing polyamide monofilament suture includes the steps of extruding a polyamide resin, stretching the solidified monofilament and annealing the stretched monofilament so that it shrinks to within about 80 to about 97 percent of the length of the monofilament prior to annealing. The polyamide monofilament sutures so produced exhibit reduced energy compared to conventional polyamide monofilament sutures.
    Type: Grant
    Filed: January 30, 1992
    Date of Patent: January 18, 1994
    Assignee: United States Surgical Corporation
    Inventors: Cheng-Kung Liu, John C. Brewer
  • Patent number: 5268133
    Abstract: Ultra-oriented, crystalline synthetic filaments with high tenacity are produced by extrusion of a fiber-forming synthetic polymer melt into a liquid isothermal bath maintained at a temperature of at least C. above the glass transition temperature of the polymer, withdrawing the filaments from the bath and then winding up the filaments. Polyethylene terephthalate filaments so produced at 3000-5000 m/min exhibit a crystalline structure and possess birefringence of 0.20-0.22, tenacity of 7-9 g/d, break elongation of 14-30% and boil-off shrinkage of 5-10%.
    Type: Grant
    Filed: February 4, 1992
    Date of Patent: December 7, 1993
    Assignee: North Carolina State University
    Inventors: John A. Cuculo, Paul A. Tucker, Gao-Yuan Chen, Ferdinand Lundberg
  • Patent number: 5264173
    Abstract: A process for producing a high strength and high initial modulus polyvinyl alcohol monofilament yarn. The monofilament yarn is polyvinyl alcohol having a polymerization degree of from 1500 to 7000, a tensile strength of not less than 10 g/d and an initial modulus of not less than 200 g/d, with a fineness of 100 denier or more. The monofilament yarn is made by dry-wet spinning a spinning dope prepared by dissolving polyvinyl alcohol having a polymerization degree of from 1500 to 7000 in a solvent and stretching the resulting unstretched filament, where a plurality of filaments immediately after being spun from a spinning nozzle having a plurality of orifices are closely adhered and united into a substantially single strand in an inert atmosphere and then introduced into a coagulating bath or a cooling bath.
    Type: Grant
    Filed: August 22, 1991
    Date of Patent: November 23, 1993
    Inventors: Masatsugu Mochizuki, Kazutaka Kooda, Siro Murakami, Naohiko Nagata, Mitsuo Kawaguchi
  • Patent number: 5262099
    Abstract: A process of the type including the steps of spinning, water-quenching, and drawing a heavy denier, polyamide monofilament in at least first and second draw stages to a total draw ratio of at least about 5.5.times.. The quenched monofilament is advanced in the first draw stage through a steamer containing a high temperature steam atmosphere and is advanced in the second draw stage through a zone heated with a radiant heater. The improvement includes:advancing the monofilament through a draw point localization zone in the first draw stage in advance of and remote from the steamer;providing a generally uniform coating of liquid water to the monofilament in the draw point localization zone, the water being provided in an amount greater than about 5% by weight based on the dry weight of the monofilament; andheating the coating of water on the monofilament in the draw point localization zone generally uniformly to a temperature greater than about C.
    Type: Grant
    Filed: April 1, 1992
    Date of Patent: November 16, 1993
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Earl B. Adams, Robert K. Anderson, Rajive K. Diwan
  • Patent number: 5238982
    Abstract: Disclosed is a method for producing polyamide fibers with reduced flammability by melt mixing a polyamide with a phosphate ester of the general formula: ##STR1## wherein n is a number of from 1 to 10;m is a number of from 0 to 3;x is a number of from 0 to 3;R is linear or branched C.sub.1 - to C.sub.18 - alkyl radical;at a temperature of from about to about C., and melt spinning fibers.
    Type: Grant
    Filed: September 24, 1992
    Date of Patent: August 24, 1993
    Assignee: BASF Corporation
    Inventors: Atish Adhya, Robert L. Lilly
  • Patent number: 5223187
    Abstract: Polyester of high intrinsic viscosity is spun, steam-heated, drawn and wound up in a multi-stage continuous process to provide an improved monofilament that is particularly suited for reinforcing rubber, e.g. in tires, after suitable dip-coating, stretching and setting.
    Type: Grant
    Filed: June 26, 1991
    Date of Patent: June 29, 1993
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: William A. Chantry, Amy G. Roberson, Taracad K. Venkatachalam