Cellulose Derivatives Patents (Class 264/187)
  • Patent number: 10836151
    Abstract: A method for separating a window includes providing a display device including a display panel, a window disposed on the display panel and including a color layer. An adhesive layer is disposed between the display panel and the window. Heat is applied to the display device. The method includes inserting a disassembling stick between the display panel and the window to separate an edge of the display panel from the window. The method includes cooling the display device. The method includes separating the display panel and the window from each other.
    Type: Grant
    Filed: November 1, 2018
    Date of Patent: November 17, 2020
    Assignee: SAMSUNG DISPLAY CO., LTD.
    Inventors: Jongman Bae, Heechang Kim, Chang-mo Park, Jinwook Yang, Soyeon Eom
  • Patent number: 10703825
    Abstract: A cellulose acetate according to the present invention has a total degree of acetyl substitution of 0.4 to 1.1 and has a compositional distribution index (CDI) of 3.0 or less, where the CDI is specified by the formula: CDI=(Measured value of half height width of chemical composition)/(Theoretical value of half height width of chemical composition) where the measured value of half height width of chemical composition is a half height width of chemical composition determined by analyzing a cellulose acetate propionate by HPLC, where the cellulose acetate propionate is prepared by propionylating all residual hydroxy groups of the cellulose acetate (sample); and Theoretical value of half height width of chemical composition=2·35482?{square root over (3*DPw*(DS/3)*(1?DS/3))}/DPw??[Math.
    Type: Grant
    Filed: March 12, 2014
    Date of Patent: July 7, 2020
    Assignee: DAICEL CORPORATION
    Inventors: Shizuka Ukita, Hiroki Taniguchi, Shu Shimamoto, Toshikazu Nakamura
  • Patent number: 10138578
    Abstract: The present invention concerns a method for the recovery of solvent in a process for preparation of regenerated cellulosic fibers using sodium hydroxide as solvent for cellulose dissolving in the manufacturing of a cellulose spinning dope wherein sodium hydroxide present in the spinning dope is at least partially recovered and recycled as sodium hydroxide from a cellulose fiber regeneration or cellulose coagulation step and wherein said cellulose fiber regeneration or cellulose coagulation step consists of a bath into which cellulose spinning dope is injected. Recovered sodium hydroxide may be directly or indirectly recycled from a cellulose fiber regeneration or cellulose coagulation step to a cellulose dissolving step.
    Type: Grant
    Filed: June 27, 2014
    Date of Patent: November 27, 2018
    Assignee: TREETOTEXTILE AB
    Inventors: Lars Stigsson, Bengt Hagström, Tobias Köhnke, Artur Hedlund, Marta Bialik
  • Patent number: 10132007
    Abstract: The present invention provides a fabricating method for meltblown nonwoven from natural cellulose fiber blended with nano silver, which comprises following steps. Firstly, prepare nano silver colloidal sol by reduction titration for mixture of polyvinyl alcohol (PVA), silver nitrate (AgNO3) and sodium borohydride (NaBH4). Secondly, prepare mixing cellulose serum by blending agitation for mixture of wood pulp, N-methylmorpholine N-oxide (NMMO) and stabilizer. Thirdly, prepare blending mucilage from mixing cellulose serum via blending process. Fourthly, produce spinning dope by blending and dehydrating the nano silver colloidal sol and mixing cellulose serum. Fifthly, produce molten filament tow by meltblown spinning method in association with coagulation, regeneration in coagulation bath, and water rinse.
    Type: Grant
    Filed: November 10, 2015
    Date of Patent: November 20, 2018
    Assignee: ACELON CHEMICALS AND FIBER CORPORATION
    Inventors: Wen-Tung Chou, Ming-Yi Lai, Kun-Shan Huang, Shao-Hua Chou, Meng-Heng Hsieh
  • Patent number: 10132009
    Abstract: The present invention provides a fabricating method for natural cellulose fiber blended with nano silver. The fabricating method comprises following steps: Firstly, prepare nano silver colloidal sol by reduction titration for mixture of polyvinyl alcohol (PVA), silver nitrate (AgNO3) and sodium borohydride (NaBH4). Secondly, prepare mixing cellulose serum by blending agitation for mixture of wood pulp, N-methylmorpholine N-oxide (NMMO) and stabilizer. Thirdly, produce spinning dope by blending and dehydrating the nano silver colloidal sol and mixing cellulose serum. Fourthly, produce fibrous tow by Dry-Jet Wet Spinning method in association with coagulation, regeneration in coagulation bath, and water rinse. Finally, obtain final product of natural cellulose fiber blended with nano silver by post treatments of dry, oil and coil in proper order.
    Type: Grant
    Filed: November 9, 2015
    Date of Patent: November 20, 2018
    Assignee: ACELON CHEMICALS AND FIBER CORPORATION
    Inventors: Wen-Tung Chou, Ming-Yi Lai, Kun-Shan Huang, Shao-Hua Chou, Meng-Heng Hsieh
  • Patent number: 9556325
    Abstract: A hydrophobized nanofibrillated cellulose foam comprising a charged hydrophobic amine, a method for providing such foam and its use.
    Type: Grant
    Filed: July 10, 2013
    Date of Patent: January 31, 2017
    Assignee: Cellutech AB
    Inventors: Nicholas Tchang Cervin, Lennart Bergström, Lars-Erik Wågberg
  • Patent number: 8790556
    Abstract: A spinneret having tri-arc holes may be used to produce tri-arc filaments. In some instances, tri-arc holes have a Y-shape with three prongs and each prong having an arc at the end of the prong that tapers from the end of the arc to a connection point of an adjacent arc, and tri-arc filaments have a generally-Y shape cross-section with bulbous or arcing tips. Further, tri-arc filaments may be useful in a plurality of applications including, but not limited to, filters, filters comprising particulate additives, and smoking device filters.
    Type: Grant
    Filed: July 25, 2012
    Date of Patent: July 29, 2014
    Assignee: Celanese Acetate LLC
    Inventors: Christopher M. Bundren, Lawton E. Kizer, Denis G. Fallon, Lixin Xue
  • Patent number: 8648144
    Abstract: The present disclosure relates to a method of forming fibers. First and second precursors, each possessing a core and at least one functional group known to have click reactivity, are mixed. The mixed precursors are then extruded under heat to cross-link during fiber production.
    Type: Grant
    Filed: February 22, 2010
    Date of Patent: February 11, 2014
    Assignees: Sofradim Production, Covidien LP
    Inventors: Ahmad Robert Hadba, Sébastien Ladet
  • Patent number: 8580167
    Abstract: The invention relates to a method and a device for producing Lyocell fibers which are extruded from a cellulose solution of water, cellulose and tertiary amine oxide in a spinning head (25). The cellulose solution is obtained in a number of process steps directly from the cellulose (3, 4) or with the formation of a cellulose suspension. Since the degree of polymerization decreases in the course of processing the cellulose through to its extrusion in the cellulose solution, with the processing of celluloses with a low degree of polymerization there is the risk that the endless molded bodies (2) extruded in the spinning head (25) exhibit defective quality.
    Type: Grant
    Filed: October 24, 2012
    Date of Patent: November 12, 2013
    Assignee: Lenzing Aktiengesellschaft
    Inventors: Stefan Zikeli, Michael Longin
  • Patent number: 8454884
    Abstract: The present invention relates to a cellulose carbamate spinning solution, the cellulose carbamate being dissolved in at least one ionic liquid. Furthermore, the invention relates to a method for the production of blown films in which a solution of cellulose carbamate in an ionic liquid is extruded into a coagulation bath, and also to the films produced with the method and the use thereof.
    Type: Grant
    Filed: April 7, 2009
    Date of Patent: June 4, 2013
    Assignee: Fraunhofer-Gesellschaft zur Forderung der angewandten Forschung e.V.
    Inventors: Horst Ebeling, Hans-Peter Fink
  • Patent number: 8420004
    Abstract: The present invention provides a meltblown wetlaid method for producing non-woven fabrics from natural cellulose using pulp as raw material and N-methylmorpholine N-oxide (NMMO) as solvent for dissolving into dope. The dope is then extruded out of a spinneret to form filament bundle by meltblown method. Subsequently, by means of ejecting mist aerosol of water, the filament bundle is coagulated with regeneration. Via post treatments of water rinsing, hydro-entangled needle punching, drying, winding-up and the like have been orderly applied, then final product of nonwoven fabrics with continuous filament are produced from natural cellulose.
    Type: Grant
    Filed: August 27, 2010
    Date of Patent: April 16, 2013
    Assignee: Acelon Chemical and Fiber Corporation
    Inventors: Wen-Tung Chou, Ming-Yi Lai, Kun-Shan Huang
  • Patent number: 8420005
    Abstract: The present invention provides a meltblown wetlaid method for producing non-woven fabrics with anti-mildew, anti-bacteria and deodorizing capabilities from natural cellulose. The method comprises selecting wood pulp as raw material and using N-methylmorpholine N-oxide (NMMO) as dissolving solvent and 1,3-phenylene-bis 2-oxazoline (BOX) as stabilizer to form mixed cellulose mucilage as well as using modified and nano-miniaturized natural chitosan as additive for blending and dissolution to form cellulose dope. By meltblown method, the dope is extruded out of spinnerets to form filament bundle, then by ejecting mist aerosol of water, the filament bundle is coagulated with regeneration. After post treatments of water rinsing, hydro-entangled needle punching, drying, winding-up and the like having been orderly applied, then final product for nonwoven fabric of continuous filament with anti-mildew, anti-bacteria and deodorizing capabilities is produced.
    Type: Grant
    Filed: September 10, 2010
    Date of Patent: April 16, 2013
    Assignee: Acelon Chemical and Fiber Corporation
    Inventors: Wen-Tung Chou, Ming-Yi Lai, Kun-Shan Huang
  • Patent number: 8366988
    Abstract: The present invention provides a “spunbond wetlaid method for producing non-woven fabrics from natural cellulose” using pulp as raw material and N-methylmorpholine N-oxide (NMMO) as solvent for dissolving into dope. Then, the dope is extruded out of a spinneret to form filament bundle by spunbond method. The dope is extruded out of a spinneret bank of grouped spinnerets to form filament bundle for further stretching process under quench condition. The filament bundle is coagulated with regeneration in a coagulating solution. The coagulated filament bundle is rapidly stretched under high pressure by an air draw-off machine. The stretched filament bundle is collected and stacked on a collecting net as web nonwoven. After post treatments of water rinsing, hydro-entangled needle punching, drying, winding-up and the like have been orderly applied then final product of nonwoven fabrics with continuous filament are produced from natural cellulose.
    Type: Grant
    Filed: September 1, 2010
    Date of Patent: February 5, 2013
    Assignee: Acelon Chemical and Fiber Corporation
    Inventors: Wen-Tung Chou, Ming-Yi Lai, Kun-Shan Huang
  • Patent number: 8303888
    Abstract: A process is disclosed of forming cellulose fibers. The process includes extruding an aqueous solution of cellulose and a solvent through a first member to form filaments. The first member has multiple rows of first and second openings with a nozzle positioned in each of the first openings. At least one of the nozzles in one row is staggered from at least one of the nozzles in an adjacent row. At least a portion of each of the filaments is shrouded in a pressurized gas emitted through each of the first openings. Each of the filaments is contacted with a liquid to remove some of the solvent and transform each of the filaments into a continuous solid fiber. The continuous solid fibers are then collected on a moving surface to form a non-woven cellulose web.
    Type: Grant
    Filed: April 11, 2008
    Date of Patent: November 6, 2012
    Assignee: Reifenhauser GmbH & Co. KG
    Inventors: Douglas B. Brown, Jeffrey D. Stark, Carmen A. Granato, Sr., Duane K. Zacharias
  • Patent number: 8282877
    Abstract: The present invention relates to a process for the production of a hydroentangled product comprising cellulose fibers, which includes the steps of (a) extruding a solution comprising cellulose dissolved in an aqueous tertiary amine-oxide through a spinneret into an air gap, thereby forming filaments (b) drawing said filaments by means of a gaseous stream (c) collecting and precipitating said filaments in order to form a web (d) bonding said web by means of a hydroentanglement process (e) contacting said filaments in the air gap with a medium which at least partially coagulates the filaments. Furthermore, the invention relates to products obtainable by said products, and uses thereof.
    Type: Grant
    Filed: April 26, 2007
    Date of Patent: October 9, 2012
    Assignee: Lenzing Aktiengesellschaft
    Inventors: Pat White, Haio Harms, Malcolm Hayhurst
  • Patent number: 8246865
    Abstract: The flame retardant viscose is obtained by adding silica to the viscose and subsequently fixing the silica to the fiber, such that the final flame retardant fiber will have regenerated cellulose and a silica polymer providing the fibers with flame retardant properties. Conventionally, the regeneration of the viscose mixture is carried out using zinc sulphate, while the final phase of washing of the fiber is accomplished using sulphuric acid. Both zinc and sulphuric acid are highly contaminating products from the environmental point of view. The invention consists, on the one hand, of replacing the zinc sulphate with aluminum sulphate and, on the other, of replacing the sulphuric acid with hydrogen peroxide or oxygenated water, this minimizing the contaminating effect of the process to an extraordinary extent.
    Type: Grant
    Filed: May 20, 2009
    Date of Patent: August 21, 2012
    Assignee: Viscocel, S.L.
    Inventors: Javier Oreña Tesouro, Angel Barcedo Miro
  • Publication number: 20120022242
    Abstract: The invention relates to a method for producing an elongate polysaccharide element, in particular a chitosan thread, comprising an operation of extruding an extrusible solution of said polysaccharide through an extrusion die and an operation of coagulating the extruded solution. The extrusible solution is a hydroalcoholic solution containing an alcohol that does not form an azeotrope with water and which has a boiling point of more than 150° C. at atmospheric pressure. The coagulation operation includes a step of evaporating the water, preferably over the alcohol, producing a gelled extruded elongate element in the form of a mainly alcoholic gel, in particular by subjecting the extruded solution to a hot air flow. At least one operation of eliminating the alcohol contained in said gel makes it possible to obtain the elongate polysaccharide element.
    Type: Application
    Filed: February 15, 2010
    Publication date: January 26, 2012
    Applicants: Laboratoire Tetra Medical, Centre National De La Recherche Scientifique, Universite Claude Bernad Lyon I
    Inventors: Alain Domard, Laurent David, Alexandra Montembault, Mylène Desorme
  • Patent number: 7981337
    Abstract: The present invention relates to the use of an aqueous sodium hydroxide/thiourea solution, specifically to the use of an aqueous sodium hydroxide/thiourea solution for pilot-scale production of cellulose products, wherein sodium hydroxide constitutes 8.1%-12.0% of the total weight of the aqueous solution, thiourea constitutes 3.0%-6.0% of the total weight of the aqueous solution, and said cellulose products include regenerated cellulose filaments, films, nonwovens, as well as composite fibers and/or functional materials of protein/cellulose, chitin/cellulose, Konjac Glucomannan/cellulose, nano-crystal particle/cellulose, etc.
    Type: Grant
    Filed: April 21, 2006
    Date of Patent: July 19, 2011
    Assignees: Wuhan University, Jiangsu Long-Ma Green Fibers Co., Ltd.
    Inventors: Lina Zhang, Dong Ruan, Jinping Zhou, Ang Lv
  • Patent number: 7959762
    Abstract: A method for making mixed polymer composite fibers in which a carboxyalkyl cellulose and a starch are blended in water to provide an aqueous gel; the aqueous gel treated with a first crosslinking agent to provide a crosslinked gel; the crosslinked gel mixed with a water-miscible solvent to provide fibers; and the fibers treated with a second crosslinking agent to provide crosslinked mixed polymer composite fibers.
    Type: Grant
    Filed: June 30, 2008
    Date of Patent: June 14, 2011
    Assignee: Weyerhaeuser NR Company
    Inventor: S Ananda Weerawarna
  • Patent number: 7938993
    Abstract: An improved process for the preparation of a cellulose solution for spinning of fibers, filaments or films therefrom comprising the steps of: a) activating cellulose in a mixture containing said cellulose, tertiary amine oxide solvent and water for a period sufficient to allow a swelling of the cellulose by introduction therein of water present in said mixtures, the temperature of said activation step and concentration of solvent being such that the solvent is not converted into its monohydrate state during the step of activation; b) the cellulose mixture being subjected to the steps of dissolution of cellulose in the solvent by heating for removal of water so as to convert the solvent into at least its monohydrate form so as to cause a dissolution.
    Type: Grant
    Filed: November 6, 2008
    Date of Patent: May 10, 2011
    Assignee: Birla Research Institute for Applied Sciences
    Inventors: Koutu Brij Bhushan, Chand Suresh Salgiya
  • Patent number: 7815832
    Abstract: In the manufacture of cellulose ester fibers, a dope is extruded into filaments. Extrusion occurs in an elongated cabinet having an outlet for the filaments. The filaments are taken up after exiting the outlet. The filaments are lubricated at the outlet of the cabinet.
    Type: Grant
    Filed: March 24, 2006
    Date of Patent: October 19, 2010
    Assignee: Celanese Acetate, LLC
    Inventors: Heather L. Clarkson, Cheryl F. Corallo, Robina M. C. Hogan, Ramiro Montez Diaz, Ronald Nivins
  • Patent number: 7727444
    Abstract: An apparatus includes a spinning nozzle, a fiber drawing device and a water spray device. The spinning nozzle has spinnerets and a spinning solution is filled therein. The spinning solution includes a solvent and a fiber material. The solvent includes N-Methylmorpholine N-Oxide, and the fiber material includes cellulose. The fiber drawing device is disposed under the spinning nozzle and has a gas flow generating device therein for generating a gas flow which is ejected from the top of the fiber drawing device and toward the bottom thereof. The fiber drawing device also has a slit on the top thereof, and the spinning solution from the spinning nozzle would enter the fiber drawing device through the slit. The water spray device is disposed at the slit of the fiber drawing device, and the spinning solution would pass through the water spray device before entering the fiber drawing device.
    Type: Grant
    Filed: November 5, 2008
    Date of Patent: June 1, 2010
    Assignee: Taiwan Textile Research Institute
    Inventors: Tzu-Hsiang Huang, Chao-Chun Peng
  • Patent number: 7713459
    Abstract: The present invention relates to cellulose fiber containing 500 to 2000 of filaments and having homogeneous physical properties and the multi-filaments according to the present invention is characterized in that the strength and the breaking elongation of the multi-filaments are 4 to 9 g/d and 4 to 15%, respectively. In particular, the present invention is characterized in that each mono-filament selected 100 strands from every three part divided from multi-filaments has properties as following: (a) 3 to 9 g/d in average strength, 7 to 15% in average breaking elongation and 0.035 to 0.055 in by birefringence, (b) the differences of the above three parts are below 1.0 g/d in average strength, 1.5% in breaking elongation and 0.7 denier in denier, (c) the CV (%) (coefficient of variation) of the above three parts are below 10%, and (d) the birefringence differences of the above three parts are below 0.004.
    Type: Grant
    Filed: June 22, 2007
    Date of Patent: May 11, 2010
    Assignee: HYOSUNG Corporation
    Inventors: Ik-Hyun Kwon, Soo-Myung Choi, Tae-Jung Lee, Jae-Shik Choi
  • Publication number: 20100021711
    Abstract: The present invention relates to Lyocell staple fiber consisting of a plurality of cut filaments, which is characterized in that at least part of said cut filaments exhibit an overall cross-sectional shape which is a bi- or multi-filar cross-sectional shape resulting from notionally partially overlapping two or more fiber cross-sectional shapes.
    Type: Application
    Filed: May 29, 2007
    Publication date: January 28, 2010
    Applicant: LENZING AKTIENGESELLSCHAFT
    Inventors: Christoph Schrempf, Franz Dümberger, Wolfgang Uhlir
  • Publication number: 20090259032
    Abstract: The present invention relates to a cellulose carbamate spinning solution, the cellulose carbamate being dissolved in at least one ionic liquid. Furthermore, the invention relates to a method for the production of blown films in which a solution of cellulose carbamate in an ionic liquid is extruded into a coagulation bath, and also to the films produced with the method and the use thereof.
    Type: Application
    Filed: April 7, 2009
    Publication date: October 15, 2009
    Applicant: FRAUNHOFER-GESELLSCHAFT zur Forderung der angewandten Forschung e.V.
    Inventors: Horst Ebeling, Hans-Peter Fink
  • Patent number: 7585442
    Abstract: A process for making a cigarette tow comprising: spinning a dope; taking-up the as-spun cellulose acetate filaments; lubricating the filaments; forming a tow from the filaments; crimping the tow with a stuffer box crimper; drying the crimped tow; and baling the dried crimped tow. The process further comprises at least two of the following: A. crimping further comprising one roller of the pair of nip rollers being adapted to induce crimp into the tow; B. crimping further comprising one roller of the pair of nip rollers being made of a solid ceramic material; C. crimping further comprising a pair of tow edge lubricators; D. crimping further comprising a steam injector; E. further comprising plasticizing the tow; F. lubricating the filaments further comprises a finish consisting of a water emulsion.
    Type: Grant
    Filed: June 25, 2004
    Date of Patent: September 8, 2009
    Assignee: Celanese Acetate, LLC
    Inventors: Philip I. L. Caenen, Gary B. Ellison, David O. Kutscher, William S. Sanderson, Mark E. Scarborough, Donald T. Stilwell
  • Patent number: 7585441
    Abstract: In the manufacture of a fiber tow, particularly cellulose acetate tow, the tow is plasticized prior to entry into the crimper. The preferred plasticizer is water.
    Type: Grant
    Filed: June 25, 2004
    Date of Patent: September 8, 2009
    Assignee: Celanese Acetate, LLC
    Inventors: Philip I. L. Caenen, William S. Sanderson
  • Patent number: 7534379
    Abstract: In the manufacture of a fiber tow, particularly cellulose acetate tow, a stuffer box crimper has a pair of tow edge lubricators adapted to lubricate the lateral edges of the tow immediately prior to contact with the nip rollers of the crimper.
    Type: Grant
    Filed: June 25, 2004
    Date of Patent: May 19, 2009
    Assignee: Celanese Acetate LLC
    Inventors: Gary B. Ellison, William S. Sanderson, Donald T. Stilwell
  • Patent number: 7534380
    Abstract: In the manufacture of a fiber tow, particularly cellulose acetate tow, a stuffer box crimper has a steam injector in communication with the stuffer channel of the crimper. The steam injector consists of a single pair of injectors vertically aligned with one another above and below the stuffer channel of the crimper.
    Type: Grant
    Filed: June 25, 2004
    Date of Patent: May 19, 2009
    Assignee: Celanese Acetate LLC
    Inventors: Gary B. Ellison, David O. Kutscher, William S. Sanderson
  • Patent number: 7445737
    Abstract: In the manufacture of a fiber tow, particularly cellulose acetate tow, a stuffer box crimper has one roller adapted to induce crimp into the tow. This roller induces crimp by preferentially weakening a portion of the tow. This roller has an axially grooved surface. This roller may be located in the stuffer box crimper or before the stuffer box crimper.
    Type: Grant
    Filed: June 25, 2004
    Date of Patent: November 4, 2008
    Assignee: Celanese Acetate, LLC
    Inventors: William S. Sanderson, Mark E. Scarborough
  • Patent number: 7425289
    Abstract: In the manufacture of a fiber tow, particularly cellulose acetate tow, a stuffer box crimper has a pair of nip rollers, at least one, made of a solid ceramic material.
    Type: Grant
    Filed: June 25, 2004
    Date of Patent: September 16, 2008
    Assignee: Celanese Acetate LLC
    Inventor: William S. Sanderson
  • Patent number: 7364681
    Abstract: The present invention relates to an apparatus for producing continuously molded bodies from a molding material, such as a spinning solution containing cellulose, water and tertiary amine oxide. The apparatus (1) comprises a die plate (3) including extrusion orifices (4) through which the molding material is extruded into substantially filament-like continuously molded bodies (5). The continuously molded bodies (5) are passed through an air gap (6) and guided in a precipitation bath (9) by a deflector (10) to a bundling means (12) where they are united into a bundle of fibers. In the air gap, a blowing means (14) is provided for directing a cooling gas stream (15) onto the continuously molded bodies (5) in a direction transverse to the direction of passage (7).
    Type: Grant
    Filed: November 11, 2002
    Date of Patent: April 29, 2008
    Inventors: Stefan Zikeli, Friedrich Ecker
  • Patent number: 7326376
    Abstract: A method of regulating the composition of the cellulose-containing extrusion solution in the production of cellulosic molded articles, whereby (a) cellulose is mixed with an aqueous amine oxide solution; (b) the mixture is converted to the extrusion solution by evaporation of water in vacuo at an elevated temperature and by input of shearing energy; (c) the extrusion solution is extruded, forming the cellulosic molded article, and is coagulated in a coagulation bath, and (d) the resulting molded article is washed to remove the residual amine oxide, characterized in that in step (a) the cellulose/amine oxide ratio is kept at a predetermined level by preregulation, and the water content of the extrusion solution is kept at a predetermined level by a main regulation after leaving step (b). This method allows accurate regulation of the composition of the solution.
    Type: Grant
    Filed: September 29, 2000
    Date of Patent: February 5, 2008
    Assignee: Lenzing AG
    Inventors: Uwe Kind, Leo Kagalowski, Marco Blech
  • Patent number: 7303710
    Abstract: The present invention relates to an apparatus and a method as well as a system for extruding continuously molded bodies for producing filaments or staple fibers from an extrusion solution, such as a cellulose solution containing water, cellulose and tertiary amine oxide such as N-methylmorpholine N-oxide. In comparison with the methods known from the prior art, profitability can be increased in the production of continuously molded bodies (3) if the extrusion rate v is set to a value v=B·T0.33·10,000·(1/r2). In a system, profitability can be enhanced if the number r of rows is r=[(B/v)·10,000·T0.33]1/2. T is here the fiber titer in T dtex, v the extrusion rate in m/min, r the number of the rows of extrusion duct orifices (12), and B an operational parameter which is not more than 4 and at least 0.5.
    Type: Grant
    Filed: April 25, 2001
    Date of Patent: December 4, 2007
    Assignee: Zimmer A.G.
    Inventors: Stefan Zikeli, Friedrich Ecker
  • Patent number: 7270779
    Abstract: The present invention relates to a method and an apparatus for extruding continuously molded bodies, wherein an extrusion solution, in particular an extrusion solution containing water, cellulose and a tertiary amine oxide, is extruded through an extrusion orifice into a continuously molded body and is then deflected by means of a deflector (7). To improve the quality of the continuously molded bodies produced by the method or apparatus of the invention, the extrusion orifices are arranged in a row such that the individual, continuously molded bodies exit in the form of a curtain (3) form the extrusion head. This curtain is then deflected by the deflector.
    Type: Grant
    Filed: April 25, 2001
    Date of Patent: September 18, 2007
    Assignee: Zimmer A.G.
    Inventors: Stefan Zikeli, Friedrich Ecker
  • Patent number: 7175792
    Abstract: Process for manufacture of cellulose mouldings, such as fibres, filaments, or films, from TCF-bleached or ECF-bleached cellulose, in which the bleached cellulose is dissolved in an aqueous tertiary aminoxide to form a mouldable cellulose, the cellulose solution deforms, and the moulding comes into being by coagulation of the deformed solution, characterized in that, to reduce the cellulose decomposition in the process, TCF-bleached cellulose is used comprising carboxyl group content in the range from 1 to 35 ?mol/g or an ECF-bleached cellulose with carboxyl group content in the range from 1 to 50 ?mol/g. Cellulose mouldings having a reduced cellulose decomposition may be formed by said process.
    Type: Grant
    Filed: September 29, 2000
    Date of Patent: February 13, 2007
    Assignee: Zimmer AG
    Inventors: Ralf-Uwe Bauer, Uwe Kind
  • Patent number: 7173094
    Abstract: Moldings of fluoro rubbers produced by crosslinking a tetrafluoroethylene/propylene copolymer or a tetrafluoroethylene/propylene/vinylidene fluoride copolymer, which have metal contents of 1.5% by mass or below in terms of metal elements and are suitable for use applications necessitating clean environment, for example, manufacturing or carrier equipment for semiconductors, manufacturing equipment, carriers, or storage containers for food, or medical supplies.
    Type: Grant
    Filed: September 20, 2002
    Date of Patent: February 6, 2007
    Assignees: Nichias Corporation, Asahi Glass Co., Ltd.
    Inventors: Kazuki Morimoto, Naoya Kuzawa, Hitoshi Ogura, Takumi Arisawa, Takeshi Kuboyama, Kinro Hashimoto, Hitoshi Yamada, Masayuki Saito, Tetsuya Miwa
  • Patent number: 7097344
    Abstract: The present invention relates to a method for making highly homogenized cellulose solution, wherein the cellulose solution is obtained by obtaining a solidified N-methylmorphorine-N-oxide (hereinafter, referred to as ‘NMMO’) hydrates which is solidified a liquid-state NMMO hydrates comprising 10 to 18% by weight water by using a simple screw-type feeder and by controlling the temperature, feeding the solidified NMMO into a twin-screw type extruder continuously, obtaining a cellulose solution which is fully swelled in a few minutes by dispersing and mixing with cellulose powder in the twin-screw type extruder, and extruding a highly homogenized cellulose solution by feeding the obtained cellulose solution into a melting zone of the extruder to melting the cellulose solution in a few minutes by minimum heat and shear force.
    Type: Grant
    Filed: October 24, 2003
    Date of Patent: August 29, 2006
    Assignee: Hyosung Corporation
    Inventors: Ik-Hyeon Kwon, Soo-Myung Choi, Young-Soo Wang, Sung-Ryong Kim, Jae-Shik Choi, Tae-Jung Lee, Seok-Jong Han, Myung-Woo Kim
  • Patent number: 7052775
    Abstract: A process for producing cellulosic formed materials having high water retention capacity according to the dry-wet extrusion process by producing a solution of 5 to 20 wt.-% of cellulose in a hydrous tertiary amine oxide, extruding the solution, stretching the extrudate in a non-precipitating medium, and precipitating the formed materials in an aqueous or alcoholic precipitating bath, characterized by extruding a solution including 0.01 to 250 wt.-%, relative to cellulose, of at least one superabsorbent polymer having a grain size of ?100 ?m. The fibers, films, and composite materials being formed are remarkable for their high water retention capacity and are suitable in the production of hygiene products, baby or disposable diapers, sanitary towels, tampons, incontinence articles, absorbent patches, wound dressings, strappings, bandages, absorbent cloths, moisture-absorbing clothing, bed mattings, filter materials or filters, packaging materials, or cable sheathings.
    Type: Grant
    Filed: July 31, 2002
    Date of Patent: May 30, 2006
    Assignee: Stockhausen GmbH & Co. KG
    Inventors: Waldemar Dohrn, Reiner Buettner, Ingo Notz, Georg Werner, Carmen Knobelsdorf, Edgar Herrmann, Michael Schuemann
  • Patent number: 7029622
    Abstract: The present invention relates to a method for producing a continuously molded body from an extrusion solution preferably containing water, cellulose and a tertiary amine. The extrusion solution is extruded through an extrusion duct orifice to obtain a continuously molded body. The continuously molded body is passed through an air gap in which it is stretched. To increase the loop strength and to reduce the tendency to fibrillate, the mean acceleration and/or the mean heat flow density are controlled according to the invention in accordance with predetermined formulae.
    Type: Grant
    Filed: April 18, 2001
    Date of Patent: April 18, 2006
    Assignee: Zimmer A.G.
    Inventors: Stefan Zikeli, Friedrich Ecker
  • Patent number: 7025926
    Abstract: The present invention relates to a method of producing a continuous molding making use of an extrusion solution containing preferably water, cellulose and a tertiary amine oxide. The extrusion solution is extruded through an extrusion-channel opening so as to form a continuous molding. The continuous molding is conducted through an air gap in which it is drawn. In order to increase the non-looping property and in order to reduce the fibrillation tendency, the present invention is so conceived that the mean acceleration and/or the mean heat flow density are controlled in accordance with predetermined formulae.
    Type: Grant
    Filed: April 12, 2002
    Date of Patent: April 11, 2006
    Assignee: Zimmer A.G.
    Inventors: Stefan Zikeli, Friedrich Ecker
  • Patent number: 6972102
    Abstract: The invention relates to a method for continually producing an extrusion solution for producing cellulosed shaped bodies, such as fibres and films, according to the lyocell method. According to the inventive method, (a) a cellulose suspension is produced from cellulose and an aqueous phase in a mass ratio ranging from 1:3 to 1:40, whereby shearing is maintained for between 5 to 200 minutes. (b) The cellulose suspension is dewatered to form a material having a cellulose content ranging from 20 to 80 mass % and the aqueous phase produced thereby is at least partially returned to step (a). (c) The humid cellulose material being homogenised is transported through a first shearing zone in the absence of N-methylmorpholine-N-oxide.
    Type: Grant
    Filed: September 29, 2000
    Date of Patent: December 6, 2005
    Assignee: Zimmer AG
    Inventors: Ralf-Uwe Bauer, Uwe Kind
  • Patent number: 6972101
    Abstract: A method and device for regulating the composition of a solution(s) in the production of cellulosic mouldings. The device comprises multiple measuring devices for the measurement of non-optical properties of the solution. According to invention, by measuring the non-optical properties of the solutions and comparison of the measured value with a preset value, the composition(s) of the solution(s) can be controlled.
    Type: Grant
    Filed: September 29, 2000
    Date of Patent: December 6, 2005
    Assignee: Zimmer AG
    Inventors: Frank-Gunter Niemz, Wilhem Meyer, Tanja Mainzer-Althof
  • Patent number: 6929884
    Abstract: A film which slowly releases solids is prepared by dissolving cellulose in a solvent such as an alkali metal salt, for example L1Cl in a polar solvent such as DMAC, dispersing the solid in the solution and gelling the solution with water to form a film.
    Type: Grant
    Filed: September 18, 2002
    Date of Patent: August 16, 2005
    Assignee: Zinc Matrix Power, Inc.
    Inventors: Michael Cheiky, Wilson Hago
  • Patent number: 6902690
    Abstract: The invention relates to a method for producing cellulosed shaped bodies. (a) Cellulose and an aqueous aminoxide are mixed, whereby a suspension is produced. (b) A cellulose solution is produced from the suspension, whereby water evaporates. (c) A first property and a second property of the produced cellulose solution is measured and the measured value is used for correcting the composition of the solution and (d) the cellulose solution is extruded through a gap of air and into an aqueous regenerating bath where said solution is coagulated to form shaped bodies.
    Type: Grant
    Filed: September 29, 2000
    Date of Patent: June 7, 2005
    Assignee: Zimmer AG
    Inventors: Frank Gunter Niemz, Wilhelm Meyer, Tanja Mainzer Althof
  • Patent number: 6887409
    Abstract: A method for the production of cellulose fibers or filaments from cell material, by the dry-wet extrusion method with aqueous amine oxides, in particular, N-methylmorpholine-N-oxide as solve is described comprising the following steps: a) dispersion of a cell material, or a cell material mixture with a cuoxam DP from 250-3000, in aqueous amine oxide, b) transformation of the obtained dispersion, by water evaporation with shear, at elevated temperature, into a homogeneous solution with a zero shear viscosity of 600 to 6000 Pa·s and a relaxation time of 0.3 to 50 seconds all at 85° C.
    Type: Grant
    Filed: March 6, 2001
    Date of Patent: May 3, 2005
    Assignee: Thuringishces Institut fur Textil und Kunststoff-Forschung E.V.
    Inventors: Birgit Kosan, Christoph Michels
  • Patent number: 6881361
    Abstract: The invention relates to a method for producing shaped bodies, especially threads or foils, from at least one polymer of the groups consisting of polysaccharide, polysaccharide derivative or polyvinyl alcohol by forming a solution of the polymer that contains an additive in a solvent containing amine-N-oxide, extruding the solution and precipitating the extrudate by contacting with a coagulant. The invention is characterized in that at least two polymeric solutions are formed. At least one of the two polymeric solutions contains one or more finely distributed additives and the at least two polymeric solutions are simultaneously extruded forming a combined extrudate.
    Type: Grant
    Filed: February 24, 2000
    Date of Patent: April 19, 2005
    Assignee: Ostthuringische Materialprufgesellschaft fur Textil und Kunststoffe mbH
    Inventors: Thomas Schulze, Eberhard Taeger, Dieter Vorbach
  • Patent number: 6861023
    Abstract: A process for making lyocell fibers including the steps of pulping raw material in a digester to provide an alkaline pulp, wherein the raw material includes sawdust in an amount greater than 0% up to 100%; contacting the alkaline pulp including cellulose and at least about 7% hemicellulose under alkaline conditions with an amount of an oxidant sufficient to reduce the average degree of polymerization of the cellulose to the range of from about 200 to about 1100 without substantially reducing the hemicellulose content or substantially increasing the copper number of the pulp; and forming fibers from the pulp.
    Type: Grant
    Filed: April 23, 2002
    Date of Patent: March 1, 2005
    Assignee: Weyerhaeuser Company
    Inventors: James E. Sealey, II, W. Harvey Persinger, Jr., Mengkui Luo, Brian Wester
  • Publication number: 20040265612
    Abstract: A process for producing cellulosic formed materials having high water retention capacity according to the dry-wet extrusion process by producing a solution of 5 to 20 wt.-% of cellulose in a hydrous tertiary amine oxide, extruding the solution, stretching the extrudate in a non-precipitating medium, and precipitating the formed materials in an aqueous or alcoholic precipitating bath, characterized by extruding a solution including 0.01 to 250 wt.-%, relative to cellulose, of at least one superabsorbent polymer having a grain size of ≦100 &mgr;m. The fibers, films, and composite materials being formed are remarkable for their high water retention capacity and are suitable in the production of hygiene products, baby or disposable diapers, sanitary towels, tampons, incontinence articles, absorbent patches, wound dressings, strappings, bandages, absorbent cloths, moisture-absorbing clothing, bed mattings, filter materials or filters, packaging materials, or cable sheathings.
    Type: Application
    Filed: July 30, 2004
    Publication date: December 30, 2004
    Inventors: Waldemar Dohrn, Reiner Buettner, Ingo Notz, Georg Werner, Carmen Knobelsdorf, Edgar Herrmann, Michael Schuemann
  • Publication number: 20040234806
    Abstract: A moldable pellet used for making high impact, non-abrasive recyclable structural composites consisting of a thermoplastic polymer or polymers, with or without fillers and additives, and a synthetic cellulosic fiber in yarn or tow form such as Rayon or Lyocell. The concentration of cellulose fiber within the pellet may vary from approximately 2-80 percent by weight or higher. This moldable pellet is suitable for molding in current molding applications such as, but not limited to, injection molding, extrusion compression molding, and compression molding.
    Type: Application
    Filed: May 18, 2004
    Publication date: November 25, 2004
    Inventors: Frank R. Cichocki, James L. Thomason, Terry L. Cheney