Synthetic Resin Containing Extrudant Patents (Class 264/184)
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Publication number: 20090160079Abstract: The invention relates to a continuous dry spinning process for preparing a fiber from a polymer solution having concentrations of polymer, salt, solvent and water. After the fiber is extruded and quenched, the fiber is placed in contact with a conditioning solution comprising concentrations of solvent, salt, and water. The conditioning solution acts upon the fiber to plasticize the fiber prior to being drawn. The conditioning solution has concentrations of solvent, salt, and water so that the fiber is plasticized to the extent necessary for drawing but does not plasticize the fiber to such an extent as to re-dissolve the fiber into a polymeric solution. A heat-treated fiber manufactured from this process has improved shrinkage and can be colored to darker shades.Type: ApplicationFiled: December 19, 2007Publication date: June 25, 2009Inventors: Mark H. Headinger, Edgar N. Rudisill, David W. Luckey
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Publication number: 20090160080Abstract: The invention relates to a continuous dry spinning process for preparing a fiber from a polymer solution having concentrations of polymer, salt, solvent and water. After the fiber is extruded and quenched, the fiber is placed in contact with a conditioning solution comprising concentrations of solvent, salt, and water. The conditioning solution acts upon the fiber to plasticize the fiber prior to being drawn. The conditioning solution has concentrations of solvent, salt, and water so that the fiber is plasticized to the extent necessary for drawing but does not plasticize the fiber to such an extent as to re-dissolve the fiber into a polymeric solution. A heat-treated fiber manufactured from this process has improved shrinkage and can be colored to darker shades.Type: ApplicationFiled: December 19, 2007Publication date: June 25, 2009Inventors: Mark H. Headinger, Edgar N. Rudisill, David W. Luckey
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Patent number: 7528216Abstract: In a preparation of random polyoxadiazole copolymer by reaction of a mixture of oleum, hydrazine sulfate, terephthalic acid, and isophthalic acid, the improvement requires the addition of oleum in more than one step.Type: GrantFiled: May 1, 2006Date of Patent: May 5, 2009Assignee: E.I. du Pont de Nemours and CompanyInventors: Kiu-Seung Lee, Harry Lee Smith, Jr.
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Publication number: 20090054620Abstract: Upon producing a meta-type wholly aromatic polyamide fiber by wet spinning a polymer solution containing a meta-type wholly aromatic polyamide containing a m-phenylenediamine isophthalamide skeleton as a major component, and an amide solvent containing a salt, (1) the polymer solution is ejected into a coagulation bath containing an amide solvent and water and containing a salt at a low concentration to coagulate as a porous thread body (fibrous material), (2) which is subsequently stretched in a plastic stretching bath containing an aqueous solution of an amide solvent, (3) is rinsed with water and then subjected to a heat treatment in a saturated steam atmosphere, and (4) is then subjected to a dry heat treatment, so as to produce a novel meta-type wholly aromatic polyamide fiber that contains an extremely small amount of a solvent remaining in the fibers, contains a small amount of a volatile substance harmful in a heat treatment step at a high temperature, is capable of suppressing coloration of a fiber pType: ApplicationFiled: January 30, 2007Publication date: February 26, 2009Applicant: TEIJIN TECHNO PRODUCTS LIMITEDInventors: Kotaro Takiue, Hiroshi Fujita
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Publication number: 20090030131Abstract: A rayon fiber that does not use a halide-based flame retardant, a phosphorous flame retardant or an organic solvent, has excellent flameproofness and launderability and is biodegradable when buried in the soil at the time of disposal, and a method for manufacturing the same are provided. The flameproof rayon fiber according to the present invention contains components of silicon and magnesium, and a compound containing the components of silicon and magnesium is amorphous.Type: ApplicationFiled: August 22, 2006Publication date: January 29, 2009Applicants: Daiwabo Co., Ltd., Daiwabo Rayon Co., Ltd.Inventors: Shigeo Fushitani, Masaru Nakano
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Publication number: 20080290551Abstract: A spinning pack for dry-wet spinning is provided with a spinneret having not less than 6,000 spinning holes and having an aspect ratio Ra of not less than 2.5 for a spinning hole array of the spinning holes. In a device and method for producing a fiber bundle, a drawing angle of single fibers formed by the single fibers and a spinneret surface of a spinneret is in a range from 87° to 92°, the single fibers being fibers discharged from the outermost spinning holes located in the long side direction of the spinneret and running to a fiber bundle diverting guide provided in a coagulation bath. Further, a drawing angle of single fibers formed by the single fibers and the spinneret surface of the spinneret is in a range from 83° to 87°, the single fibers being fibers discharged from the outermost spinning holes located in the short side direction of the spinneret and running to the fiber bundle diverting guide provided in the coagulation bath.Type: ApplicationFiled: June 23, 2005Publication date: November 27, 2008Inventors: Kohei Takatani, Makoto Kibayashi, Koji Matsumoto, Kazuhisa Narusawa
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Publication number: 20080200640Abstract: Disclosed are wholly aromatic polyamide filament and a method of manufacturing the same, characterized by comprising multi-stage injection of a coagulant with sulfuric acid concentration lowered sequentially stage by stage, to a spun material fed into a coagulant injection tank. The present invention enables increase of a spinning and take-up velocity without occurrence of thread cutting by uniformly and evenly coagulating surface and inside of the spun material. In addition, the present invention recovers the coagulant or water already used and reuses the recovered coagulant or water in the earlier stages, so that it has advantages of saving production costs and reducing environmental contamination. Accordingly, the wholly aromatic polyamide filament produced according to the present invention has high crystallinity X, large apparent crystal size ACS and reduced defects in the crystal itself, thereby exhibiting more improved physical properties such as strength and modulus.Type: ApplicationFiled: July 5, 2006Publication date: August 21, 2008Inventors: In-Sik Han, Jae-Young Lee, Seung-Hwan Lee, Jae-Young Kim, So-Yeon Kwon
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Publication number: 20080164632Abstract: A spinning nozzle for producing the synthetic fibers and a method for producing a DNA counterfeit-proof fiber by the spinning nozzle are provided. The spinning nozzle includes a polymer solution inflow passage and a pair of water inflow passages located at the both sides of the polymer solution inflow passage, wherein the polymer solution inflow passage and the water inflow passages are converged into a mixing outflow passage and a synthetic fibers are produced at the outlet of the mixing outflow passage. A method for producing a DNA counterfeit-proof fiber by the spinning nozzle includes the steps as follows. First, mixing a plurality of the DNA microcapsules with a material solution to produce a polymer solution. Then, to form a converging interface between the polymer solution and the two streams of acid-hydrolysis waters. Afterwards, causing the flowing polymer solution to converge with the two streams of acid-hydrolysis waters for producing the DNA counterfeit-proof fiber.Type: ApplicationFiled: June 12, 2007Publication date: July 10, 2008Inventor: Ming-Wen Wang
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Patent number: 7189346Abstract: The present invention relates to polybenzazaole (PBZ) fibers and processes for the preparation of such fibers. The invention further relates to yarns, fabrics, and articles incorporating fibers of this invention, and processes for making such yarns, fabrics, and articles.Type: GrantFiled: July 22, 2004Date of Patent: March 13, 2007Assignee: E. I. du Pont de Nemours and CompanyInventor: Kiu-Seung Lee
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Patent number: 7135135Abstract: A multilayer construction that includes a first layer that includes water sensitive thermoplastic polymer and a second layer disposed on the first layer, the second layer including superabsorbent polymer.Type: GrantFiled: April 11, 2002Date of Patent: November 14, 2006Assignee: H.B. Fuller Licensing & Financing, Inc.Inventor: Stewart C. Anderson
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Patent number: 6830715Abstract: Method and device for producing elastane threads from spinning solutions using recycled elastane material.Type: GrantFiled: August 20, 2001Date of Patent: December 14, 2004Assignees: Bayer Faser GmbH, Bayer AktiengesellschaftInventors: Ulrich Reinehr, Tilo Sehm, Wolfgang Anderheggen, Toni Herbertz, Helmut Judat
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Publication number: 20040119187Abstract: A composition of matter suitable for spinning polyaniline fiber, a method for spinning electrically conductive polyaniline fiber, a method for exchanging dopants in polyaniline fibers, and methods for dedoping and redoping polyaniline fibers are described.Type: ApplicationFiled: September 26, 2003Publication date: June 24, 2004Inventors: Benjamin R. Mattes, Phillip N. Adams, Dali Yang, Lori A. Brown, Andrei G. Fadeev, Ian D. Norris
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Patent number: 6692828Abstract: Disclosed is a spandex fiber prepared to be excellent in resistance to both chlorine and heat without affecting the properties of the polyurethane polymer, and manufacturing method thereof. The spandex fiber contains hydrotalcite coated with 0.1 to 10 wt. % of a melamine-based compound. The melamine-based compound includes melamine compounds, phosphor-associated melamine compounds, melamine cyanurate compounds, melamine compounds substituted with an organic compound having a carboxyl group, phosphor-associated melamine compounds substituted with an organic compound having a carboxyl group, or melamine cyanurate compounds substituted with an organic compound having a carboxyl group, which are used alone or in combination. The spandex fiber has a high resistance to both chlorine and heat and is therefore useful for underwear, socks, and particularly, sports apparels such as swimsuit.Type: GrantFiled: September 24, 2002Date of Patent: February 17, 2004Assignees: Hyosung Corporation, Doobon Inc.Inventors: Byung Su Song, Tae Woo Lee, Ji Won Kim, Seung Won Seo, Dae Hwi Lee
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Publication number: 20030215656Abstract: A process for reducing the haze of extrusions of clear polymeric blends containing styrene-butadiene copolymer and a polymer immiscible therewith. An assembly of extrusion layers in which a layer of clear polymeric blends containing styrene/butadiene copolymer and a polymer immiscible therewith is overlayered with layers of clear material that provides a smooth extruded surface.Type: ApplicationFiled: June 19, 2003Publication date: November 20, 2003Applicant: Phillips Petroleum CompanyInventors: Mark D. Hanes, Lee A. Carvell
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Publication number: 20030165677Abstract: This invention provides processes for preparing fiber or film comprising a polyurethane and layers delaminated from a lamellar clay, said layers being dispersed in said Polyurethane. Fiber and film produced by the processes of the present invention exhibit reduced tack and an increased ability to affix at least one dye.Type: ApplicationFiled: December 12, 2002Publication date: September 4, 2003Inventors: Leonard Edward Raymond Kosinski, Govindasamy Paramasivam Rajendran, Robert Rex Reitz
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Patent number: 6602453Abstract: Described are a process for producing elastane yarn having a linear density of at least 2500 dtex by the wet spinning process and the thereby producible coarse linear density elastane yarn having a wide cross section and a low residual solvent content. The process comprises the steps of spinning an up to 35% strength by weight stable-viscosity elastane solution into a coagulation bath, washing and optionally drawing, drying by contact heating, setting, spin finishing and winding the yarn, the filaments leaving the coagulation bath passing around a diverting roller disposed just above the coagulation bath liquid, the as-spun filament linear density amounting to not more than 1% of the value of the final linear density, the jet stretch ratio being within the range from 0.5 to 50, the contact heating temperature being at least 220° C. and the contact time of the elastane yarn being at least 2 seconds.Type: GrantFiled: December 29, 2000Date of Patent: August 5, 2003Assignee: Bayer Faser GmbHInventors: Ulrich Reinehr, Tilo Sehm, Wolfgang Anderheggen, Toni Herbertz
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Publication number: 20030141251Abstract: A hollow fiber microfiltration (MF) membrane is provided. The casting solution used to make this membrane includes a fiber-forming polymer having a degree of polymerization greater than about 1000, a water-soluble polymer, an anhydride with about 2 to 12 carbon atoms, and a solvent. The membrane is formed by mixing and heating these components to form a viscous dope and then extruding the dope through an annular orifice to form a hollow fiber MF membrane. The hollow fiber membrane is then fed through a coagulation bath and two leaching baths. The membrane is especially useful for filtering liquids, such as wine and juice, so as to remove bacteria, gel, and solid particles from the liquids.Type: ApplicationFiled: January 28, 2002Publication date: July 31, 2003Applicant: Koch Membrane SystemsInventors: Jiang Ji, Candeloro DiCecca, Edward M. Schulz, Mahesh Mehta, David Stead, David McKinley, David H. Koch
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Patent number: 6569987Abstract: To produce meta aramid filaments having a good quality from a polymer solution of a meta aramid produced by a solution polymerization method, with high efficiency, (1) a meta aramid is prepared by polymerization-reacting a aromatic meta-diamine with a aromatic meta-dicarboxylic acid chloride in a polar organic solvent; (2) hydrogen chloride contained in the resultant polymer solution is neutralized with a neutralizing agent containing an alkali metal hydroxide which can react with hydrogen chloride to produce a salt thereof insoluble in the polymerization solvent; (3) the salt deposited from the polymer solution is removed by filtration; (4) the resultant polymer solution is mixed with water and a polar organic amide solvent to prepare a spinning solution; (5) the resultant meta aramid spinning solution is directly extruded in the form of filamentary streams into an aqueous coagulation liquid, to coagulate the extruded filamentary streams of the polymer solution into the form of filaments; (6) the coagulatedType: GrantFiled: June 21, 2001Date of Patent: May 27, 2003Assignee: Teijin LimitedInventors: Akihiro Ohba, Takashi Yoshitomi, Hirozumi Iwasaki, Kotaro Takiue
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Patent number: 6569366Abstract: A meta-type wholly aromatic polyamide containing, as principal repeating units, meta-phenylenediamineisophthalamide units is dissolved in an amide compound solvent; the resultant polymer solution is subjected to a wet-spinning procedure wherein the polymer solution is extruded in the form of filamentary streams into a coagulation bath containing an amide compound-containing solvent and water but substantially not containing salts, through spinning orifices of a spinneret, to coagulate the extruded filamentary polymer solution streams in the coagulation bath; the coagulated porous undrawn filaments are subjected to a drawing procedure wherein the porous undrawn filaments are drawn in a plasticizing drawing bath containing an aqueous solution of an amide compound solvent; the resultant drawn filaments are washed with water, and then heat-treated (for example, further drawn at a draw ratio of 0.7 to 4.0 while being heated at a temperature of 250 to 400° C.Type: GrantFiled: October 15, 2001Date of Patent: May 27, 2003Assignee: Teijin LimitedInventors: Kiyotsuna Toyohara, Jiro Sadanobu, Tsutomu Nakamura
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Patent number: 6565786Abstract: The present invention provides a method for producing a formed article from a dope comprising a polyphosphoric acid solvent and a polymer soluble in polyphosphoric acid, which includes using a production apparatus containing an apparatus for stirring and uniformly dispersing or homogenizing a dope and a pump apparatus for delivering the uniformly dispersed or homogeneous dope, wherein at least one of the apparatus and the pump apparatus has a part that comes into contact with the dope. According to the present invention, maintenance frequency of production facility due to the corrosion and elution of metal in a recovered solvent can be reduced, which in turn decreases the production cost.Type: GrantFiled: December 12, 2000Date of Patent: May 20, 2003Assignee: Toyo Boseki Kabushiki KaishaInventors: Yoshihiko Teramoto, Shoichi Uemura, Kiyoshi Hotta
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Patent number: 6533975Abstract: This invention provides processes for preparing fiber or film comprising a polyurethane and layers delaminated from a lamellar clay, said layers being dispersed in said polyurethane. Fiber and film produced by the processes of the present invention exhibit reduced tack and an increased ability to affix at least one dye.Type: GrantFiled: September 20, 2000Date of Patent: March 18, 2003Assignee: E. I. du Pont de Nemours and CompanyInventors: Leonard Edward Raymond Kosinski, Govindasamy Paramasivam Rajendran, Robert Rex Reitz
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Patent number: 6506333Abstract: The present invention provides a method for fabricating a medical tubing. The method includes the steps of: (1) providing a material selected from the group consisting of ethylene homopolymers and ethylene copolymers, wherein the ethylene copolymers are obtained by copolymerizing ethylene with a comonomer selected from the group consisting of lower alkyl olefins, lower alkyl esters of a carboxylic acid and lower alkene esters of a carboxylic acid, the lower alkyl and lower alkene each have from 3-18 carbons, or blends thereof; (2) providing an extruder with an extrusion die; (3) extruding the material into a medical tubing; (4) providing a surface modifier solution; (5) preheating the surface modifier solution to a temperature within the range of 50-80° C.; and (6) applying the preheated solution onto the tubing at it exits the extrusion die when the tubing is in a molten state or a semi-molten state.Type: GrantFiled: September 3, 1999Date of Patent: January 14, 2003Assignee: Baxter International Inc.Inventors: Chuan Qin, Patrick T. Ryan, Michael T. K. Ling, Donna L. Rostron, Yuanpang S. Ding, Lecon Woo, Susan R. Mizener, Birendra K. Lal
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Publication number: 20020122937Abstract: A hollow shrinkable fiber is manufactured by wet spinning a copolymer of acrylonitrile and a halogen-containing vinyl monomer, and then carrying out steam treatment, followed by drying treatment, and then heat treatment, thus forming a marrow-like or network-like hollow portion comprising a large number of voids in a core part of the fiber cross section. The void ratio of the fiber cross section is 10 to 50%, and the dry heat shrinkage percentage of the fiber is at least 15%. The fiber has a hollow form similar to that of natural fur, is excellent in terms of bulkiness, a lightweight feeling and warmth retention, and can be used as down hairs in pile products.Type: ApplicationFiled: November 16, 2001Publication date: September 5, 2002Inventors: Shin Sudo, Satoru Harada
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Publication number: 20020113335Abstract: Coagulation spinning produces structures such as fibers, ribbons, and yarns of carbon nanotubes. Stabilization, orientation, and shaping of spun materials are achieved by post-spinning processes. Advantages include the elimination of core-sheath effects due to carbonaceous contaminants, increasing mechanical properties, and eliminating dimensional instabilities in liquid electrolytes that previously prohibited the application of these spun materials in electrochemical devices. These advances enable the application of coagulation-spun carbon nanotube fibers, ribbons, and yarns in actuators, supercapacitors, and in devices for electrical energy harvesting.Type: ApplicationFiled: September 4, 2001Publication date: August 22, 2002Inventors: Alex Lobovsky, Jim Matrunich, Mikhail Kozlov, Robert C. Morris, Ray H. Baughman, Anvar A. Zakhidov
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Patent number: 6436319Abstract: A method for preparing a hollow fiber-type separation membrane from high density polyethylene is provided, which includes the steps of: melt-spinning a mixture of a high density polyethylene and a diluting agent to produce a phase-separated undrawn hollow fiber; detecting a tensile strength of the undrawn fiber during an alternative and repetitive winding and unwinding procedure between two bobbins, said undrawn fiber being drawn during the alternative and repetitive winding and unwinding procedure; reducing a rotation speed of one of the two bobbins when the detected tensile strength is larger than a predetermined value; and increasing a rotation speed of one of the two bobbins when the detected tensile strength is smaller than the predetermined value to yield the hollow fiber-type separation membrane.Type: GrantFiled: January 13, 2000Date of Patent: August 20, 2002Assignee: Agency for Technology and StandardsInventors: Hyang Sun, Yong Sang Yi, Kyu Bong Rhee
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Patent number: 6413070Abstract: Systems and methods for the manufacture of reinforced, three-zone, microporous phase inversion membrane having any one of a plurality of different possible pore sizes in any of the three zones from at least a single mother dope batch is disclosed. The systems and methods include formulating at least a single mother batch of dope in a vessel preferably maximizing the non-solvent to solvent ratio for a given weight percentage of polymer for use in a microporous phase inversion membrane production operation to produce three-zone phase inversion membranes having one of a plurality of different predetermined pore sizes in any or all of the three zones. The at least one mother dope batch is controllably formulated in at least one vessel such that the temperature of the dope does not exceed a predetermined maximum mixing temperature and is maintained at a relatively low temperature (lower than the mixing temperature) suitable for storage.Type: GrantFiled: March 9, 2000Date of Patent: July 2, 2002Assignee: Cuno IncorporatedInventors: Mark T. Meyering, William R. Kelly, Jack H. Vining, C. Thomas Baddenhop, Joseph G. Wallace
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Patent number: 6290888Abstract: The present invention provides a highly oriented aramid fiber with high tensile strength, high tensile modulus and low breakage elongation by spinning liquid crystal polymers such as aramids and drafting the polymer in or adjacent to a first coagulating bath. A polymer solution with concentration of 4-24 weight % is extruded as a stream into a non-coagulating fluid, and the stream is stretched in the non-coagulating fluid and passed through a first coagulating bath where it is drafted by using a drafting roller, so that the polymer concentration of the flue is increased sufficient to form fibers. As a result, a highly oriented aramid fiber with tensile strength of 1500-5000 MPa, tensile modulus of 200-500 GPa, and the % elongation of 0.8-1.4 is provided.Type: GrantFiled: August 4, 1999Date of Patent: September 18, 2001Assignee: Kansai Research Institute (KRI)Inventor: Kigen Kawai
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Patent number: 6280843Abstract: Aromatic polyamide fibers which have a crystalline structure having (1) crystal size (A) in a (110) plane of 7.5 nm, (2) crystal size (B) in a (200) plane of 8.2 nm and (3) a product A×B of 61.50 to 630.00, and exhibit a thermal linear expansion coefficient of −1.0×10−6/° C. to −7.5×10−6/° C. and thus a high dimensional stability even upon moisture-absorbing and desorbing, are useful for forming a resin-reinforcing fiber sheet, a pre-preg containing the fiber sheet, and a laminate for, for example, an electric insulating material or electric circuit board, having an excellent cutting, shaving, perforating or laser processability and capable of forming a smooth cut, shaved or perforated face.Type: GrantFiled: June 3, 1999Date of Patent: August 28, 2001Assignee: Teijin LimitedInventors: Sadamitsu Murayama, Masanori Wada, Michikage Matsui
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Patent number: 6258916Abstract: The present invention relates to a process for obtaining PAI fibers by spinning PAI in solution and to the fibers thus obtained. They are obtained by dry or wet spinning into dimethylalkyleneurea followed by removal of the solvent and overdrawing at high temperature. The yarns and fibers obtained are produced from PAI based on tolylene or meta-phenylene diisocyanate, and on an aromatic acid anhydride and/or an aromatic dianhydride, and optionally on one or a number of diacid compounds. They exhibit an outstanding thermomechanical behavior and make it possible to gain access to very low linear densities.Type: GrantFiled: January 14, 1998Date of Patent: July 10, 2001Assignee: Rhone-Poulenc FibresInventors: Philippe Michaud, Marie-Eve Perier, Jean Russo
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Patent number: 6245876Abstract: The present invention relates to a continuous shaped article such as a polyurethaneurea fiber and a polyurethaneurea film having a birefringence index (&Dgr;n) of from at least 1.0×10−4 to 8.0×10−4 in a nontensile state, a crosslinking density at an elongation of 100% (N100) of at least 5.0×1026/m3, a crosslinking point density at an elongation of 400% (N400) of from 4.0×1026 to 3.0×1027/m3, and a crosslinking point density at the time of breakage (Nt) of at least 1.6×1027/m3, wherein the ratio of the crosslinking density at an elongation of 400% to that at an elongation of 100% (N400/N100) is from 0.9 to 1.3, and a process for producing the same. The present invention has made the continuous shaped article show an initial stress, a strength at break and an elongation at break which are sufficiently high, and a small rise in the stress in the medium elongation range.Type: GrantFiled: August 27, 1999Date of Patent: June 12, 2001Assignee: Asahi Kasei Kogyo Kabushiki KaishaInventors: Hiroyuki Hanahata, Yoshihiko Shimaya
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Patent number: 6197238Abstract: This invention relates, in general, to thermoplastic film and fiber structures and methods of making the same. More specifically, this invention relates to substantially water-free films and fibers comprising unmodified polyvinyl alcohol.Type: GrantFiled: January 31, 2000Date of Patent: March 6, 2001Assignee: Kimberly-Clark Worldwide, Inc.Inventors: James Hongxue Wang, David Michael Schertz, William S. Pomplun
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Patent number: 6171537Abstract: A process for the preparation of poly(urethaneurea) fibers by reacting a blocked aliphatic diamine with a capped glycol prepolymer, followed by extrusion spinning, is provided.Type: GrantFiled: March 25, 1999Date of Patent: January 9, 2001Assignee: E.I. du Pont de Nemours and CompanyInventor: Jeffrey David Cohen
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Patent number: 6123883Abstract: Stable, concentrated solutions of high molecular weight polyaniline. In order to process high quality fibers and other articles possessing good mechanical properties, it is known that solution concentrations of the chosen polymer should be in the range from 15-30% (w/w). Moreover, it is desirable to use the highest molecular weight consistent with the solubility properties of the polymer. However, such solutions are inherently unstable, forming gels before processing can be achieved. The present invention describes the addition gel inhibitors (GIs) to the polymer solution, thereby permitting high concentrations (>15% (w/w)) of high molecular weight ((M.sub.w)>120,000, and (M.sub.n)>30,000) emeraldine base (EB) polyaniline to be dissolved. Secondary amines have been used for this purpose in concentrations which are small compared to those which might otherwise be used in a cosolvent role therefor.Type: GrantFiled: June 16, 1999Date of Patent: September 26, 2000Assignee: The Regents of the University of CaliforniaInventors: Benjamin R. Mattes, Hsing-Lin Wang
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Patent number: 6056529Abstract: Systems for processing dope for the manufacture of microporous phase inversion membrane having any one of a plurality of different pore sizes from a single master dope batch is disclosed. The systems and methods include formulating a single master batch of dope preferably maximizing the non-solvent to solvent ratio for a given weight percentage of polymer for use in a microporous phase inversion membrane casting operation to produce phase inversion membranes having one of a plurality of different predetermined pore sizes. The master dope batch is controllably formulated in a vessel such that the temperature of the dope does not exceed a predetermined maximum mixing temperature and is maintained at a relatively low temperature (lower than the mixing temperature) suitable for storage.Type: GrantFiled: February 11, 1998Date of Patent: May 2, 2000Assignee: Cuno, Inc.Inventors: Mark T Meyering, William R. Kelly, Joseph G. Wallace
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Patent number: 6054214Abstract: A process for preparing high strength carbon fiber from PAN-fiber wherein the time of the oxidation step is reduced from 30-90 minutes to about 8-15 minutes and product prepared therefrom.Type: GrantFiled: July 20, 1998Date of Patent: April 25, 2000Inventor: Kenneth Wilkinson
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Patent number: 6042941Abstract: A fiber of a para-aromatic polyamide polymer having a surprisingly higher modulus. This fiber has a quantity of sulphur bound to the aromatic nuclei of the polymer and wherein the quantity of nucleus-bound sulphur is 0.05-0.20% by weight. A process for the manufacture of para-aromatic polyamide fiber of increased modulus.Type: GrantFiled: November 17, 1998Date of Patent: March 28, 2000Assignee: Akzo Nobel NVInventors: Bastiaan Krins, Monique Helene Marielle Meeusen-Wierts, Harm van der Werff
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Patent number: 6017474Abstract: 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: GrantFiled: June 19, 1998Date of Patent: January 25, 2000Assignee: National University of SingaporeInventors: Wah Koon Teo, Kang Li, Dongliang Wang
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Patent number: 6015516Abstract: 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: GrantFiled: June 19, 1998Date of Patent: January 18, 2000Assignee: National University of SingaporeInventors: Tai-Shung Chung, Xudong Hu, Soo Khean Teoh
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Patent number: 6011118Abstract: A fluororesin sheet is disclosed which comprises an aromatic polyamide pulp and a fluororesin as an essential component, the tensile strength of the fluororesin sheet being not less than about 250 kg/cm.sup.2. A process for producing this fluororesin sheet comprises dispersing the aromatic polyamide pulp and the fluororesin powder in water, adding a coagulating agent which destabilizes the dispersing of the fluororesin powder to the dispersion to deposit the fluororesin powder on the surface of the aromatic polyamide pulp, paper-making, followed by drying to obtain a sheet article, and compressing the sheet article using a roller, followed by heating.Type: GrantFiled: January 30, 1998Date of Patent: January 4, 2000Assignee: Akzo Nobel nvInventors: Kosaku Asagi, Toshiharu Yamabayashi
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Patent number: 5968432Abstract: A process of making a fiber includes the sequential steps of extruding as a stream solution of a polymer having a polymer concentration of 4-24 weight % into a non-coagulating fluid, stretching the stream while in the non-coagulating fluid, passing the stream through a first coagulating bath, stretching the stream in a non-coagulating fluid, and passing the stream through a coagulating bath to sufficiently increase the polymer concentration in the stream to form the fiber.Type: GrantFiled: March 4, 1997Date of Patent: October 19, 1999Assignee: Kansai Research Institute (KRI)Inventor: Kigen Kawai
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Patent number: 5961908Abstract: A spinning noxxle apparatus for the production of elastane filaments from spinning solutions by the wet spinning method comprising a feed line (7) for the spinning solution, a filter unit (1) having a mixer element (2) and a filter element element (3), a spinning nozzle (5) for immersion in a precipation bath (11), and a connection piece (8) for the direct connection of the filter unit (1) and spinning nozzle (5), wherein the spinning nozzle (5) is joined to the connection piece (8) by a quick-release coupling connection (4), particularly a bayonet coupling (4).Type: GrantFiled: March 18, 1998Date of Patent: October 5, 1999Assignee: Bayer Faser GmbHInventors: Ulrich Reinehr, Tilo Sehm, Wolfgang Anderheggen, Toni Herbertz
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Patent number: 5952434Abstract: 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: GrantFiled: January 9, 1998Date of Patent: September 14, 1999Assignee: 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
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Patent number: 5945054Abstract: The invention pertains to a process for manufacturing filaments from an optically anisotropic spinning solution in which the spinning solution is extruded through spinning orifices grouped in at least one spinning section and the extrudates are passed through an inert gas and a coagulation bath in succession, with the ratio of the spacing of the spinning orifices to the width of the spinning section being more than 0.15 and less than 0.7, and the width of the spinning section being less than 5 mm. The invention makes it possible to spin a plurality of filaments of good physical properties at a high speed and a comparatively high acid concentration in the coagulant without widespread sticking.Type: GrantFiled: April 21, 1998Date of Patent: August 31, 1999Assignee: Akzo Nobel N.V.Inventors: Johannes Jacobus Meerman, Erik Wilhelmus Maria Derksen, Peter Jeroen Cloos
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Patent number: 5938999Abstract: 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: GrantFiled: February 14, 1997Date of Patent: August 17, 1999Assignee: The United States of America as represented by the Secretary of the NavyInventors: Leonard J. Buckley, Mark Eashoo
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Patent number: 5932157Abstract: A composite film is described which has at least one base layer which predominantly comprises polypropylene, and at least one top layer. The top layer is sealable and comprises a homopolymer of an olefin. A process for producing the composite film, the top layer olefin homopolymer and packaging material made from the film also are described.Type: GrantFiled: May 17, 1996Date of Patent: August 3, 1999Assignee: Hoechst AktiengesellschaftInventors: Thomas Dries, Gunter Schloegl, Walter Spaleck, Andreas Winter
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Patent number: 5910274Abstract: 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: GrantFiled: September 4, 1997Date of Patent: June 8, 1999Assignee: Praxair Technology, Inc.Inventors: James Timothy Macheras, Benjamin Bikson, Joyce Katz Nelson
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Patent number: 5889138Abstract: A process for making stain resistant nylon fibers from a mixture of nylon and highly sulfonated nylon copolymer is disclosed. The highly sulfonated nylon has greater than about 4.0% weight of aromatic sulfonate incorporated into the polymer structure and an unexpectedly low solid particle content as measured by Flow Vision Particle Analyzer and melt filtration studies. Also disclosed is the process and composition of the highly sulfonated nylon copolymer.Type: GrantFiled: January 17, 1997Date of Patent: March 30, 1999Assignee: Solutia Inc.Inventor: Arthur W. Summers
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Patent number: 5888434Abstract: The invention relates to a process for preparing a microporous membrane from an unsulfonated poly(phenylene sulfide) polymer by forming a mixture of an unsulfonated poly(phenylene sulfide) polymer, an amorphous polymer, and optionally a plasticizer, heating the resulting mixture, extruding or optionally casting the mixture into a membrane, controlled cooling (quenching) or coagulating the membrane, and leaching the membrane, while optionally drawing the membrane before, during, and/or after leaching.Type: GrantFiled: February 3, 1993Date of Patent: March 30, 1999Assignee: The Dow Chemical CompanyInventors: Robert D. Mahoney, Jiro Kawamoto, Richard A. Lundgard, Mark F. Sonnenschein, Hawk S. Wan, H. Nelson Beck
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Patent number: 5882563Abstract: The invention relates to an improvement of the known process for spinning poly(p-phenylene terephthalamide) via an air gap spinning process. It comprises mixing poly(p-phenylene terephthalamide) with concentrated sulphuric acid by a freezing process, heating the solid mixture, and passing the resulting solution to the spinning orifices under pressure. It involves the use of a mixing kneader to convert the solid mixture into a spinning solution.Type: GrantFiled: October 27, 1997Date of Patent: March 16, 1999Assignee: Akzo Nobel NVInventors: Wilhelmus Marie Roelofs, Antonius Hendrikus Maria Spieker, Johannes Gerrit Waringa
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Patent number: 5882566Abstract: A method to make electrically conductative high strength and high modulus poly(p-phenylene terephthalamide) fibers rendered electrically conductive with sulfonic acid insitu ring-substituted polyaniline.Type: GrantFiled: June 11, 1997Date of Patent: March 16, 1999Assignee: E. I. du Pont de Nemours and CompanyInventors: Che-Hsiung Hsu, Hsiang Shih