Cellulose Derivative Patents (Class 264/207)
  • Patent number: 9441318
    Abstract: The present invention provides a processing method of non-woven intrinsically with enhanced deodorant feature from bamboo. The process uses mixture of wasted coffee residue and bamboo pulp as raw material. The process uses N-methylmorpholine N-oxide (NMMO) as primary solvent and 1, 3-phenylene-bis 2-oxazoline (BOX) as additive stabilizer. A cellulose solution is firstly formed by the wasted coffee residue, bamboo pulp, NMMO and BOX aforesaid. Secondly, via grinding, blending, dissolving and thermal dehydrating, the cellulose solution is converted into spinning dope. Thirdly, via meltblown method, the dope is extruded out of spinnerets in a die assembly by a metering gear pump to form thread bundle.
    Type: Grant
    Filed: June 6, 2013
    Date of Patent: September 13, 2016
    Assignee: ACELON CHEMICAL AND FIBER CORPORATION
    Inventors: Wen-Tung Chou, Ming-Yi Lai, Kun-Shan Huang
  • Patent number: 9017586
    Abstract: Polymeric structures, methods for making same, fibrous structures comprising same and fibrous product incorporating same are provided.
    Type: Grant
    Filed: May 21, 2010
    Date of Patent: April 28, 2015
    Assignee: The Procter & Gamble Company
    Inventors: David William Cabell, Paul Dennis Trokhan, David Warren Loebker
  • Patent number: 8961845
    Abstract: The present invention provides an optical compensation film, which has excellent visibility such as light leakage, uneven color tone and front contrast, and can simultaneously realize retardation and wavelength dispersion. The optical compensation film is characterized by containing a cellulose ester, the following polymer (a), and the following compound (b). (a) A polymer produced by copolymerizing an ethylenically unsaturated monomer having in its molecule a partial structure represented by Formula (1) with at least one ethylenically unsaturated monomer. (b) An esterified compound produced by esterifying all or a part of OH groups in a compound (A) having one furanose structure or one pyranose structure, or an esterified compound produced by esterifying all of or a part of OH groups in a compound (B) containing nor less than 2 and not more than 12 structures of at least one of a furanose structure or a pyranose structure.
    Type: Grant
    Filed: June 28, 2013
    Date of Patent: February 24, 2015
    Assignee: Konica Minolta Opto, Inc.
    Inventor: Takashi Sera
  • 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: 8304040
    Abstract: A polymer is swollen in a first tank. The swelling temperature is in the range of ?10 to 50° C. The mixture is cooled in a first cooling vessel to the range of ?100 to ?10° C., and thereafter heated in a heating device to the range of 0 to 57° C. The polymer is cellulose acylate in which a degree of substitution of the acyl group for hydroxyl group is at least 2.87. A film obtained from the cellulose acylate has a negative value of ?Re and a positive value of ?Rth, and |?Rth| is at least 10 nm. ?Re and ?Rth are respective difference of Re and Rth at the measurement thereof with use of wavelengths between 700 nm and 400 nm. The film is used adequately as a birefringence film, a protective film for a polarizing filter in a liquid crystal display.
    Type: Grant
    Filed: January 26, 2005
    Date of Patent: November 6, 2012
    Assignee: FUJIFILM Corporation
    Inventor: Yasuyuki Sasada
  • Patent number: 8188164
    Abstract: Disclosed herein is a thermoplastic cellulosic composition for preparing a cellulose-based masterbatch and/or a fiber with an improved breaking elongation. In one example, the thermoplastic cellulosic composition includes an esterified cellulose present in a range of about 77 wt % to about 95 wt %, polyethylene glycol present in a range of about 4.5 wt % to about 15 wt %, a bifunctional reactant present in a range of about 0.01 wt % to about 3 wt %, an initiator present in a range of about 0.01 wt % to about 0.15 wt %, and a dispersing agent present in a range of about 0.01 wt % to about 5 wt %.
    Type: Grant
    Filed: June 14, 2010
    Date of Patent: May 29, 2012
    Assignee: Taiwan Textile Research Institute
    Inventors: Su-Chen Chen, Sheng-Jen Lin, Nai-Yun Liang, Wei-Peng Lin
  • Patent number: 8163215
    Abstract: A solution system for biopolymers in the form of carbohydrates based on a molten ionic liquid, additives optionally being contained in the solution system, is described. This solution system contains a protic solvent or a mixture of several protic solvents, and in the case where the protic solvent is solely water, this is present in the solution system in an amount of more than about 5 wt. %. Carbohydrates can be incorporated into the solution system, in particular in the form of starch, cellulose and derivatives thereof, and it can then be used for regeneration of the carbohydrates contained therein. A particularly advantageous process for the preparation of the solution system containing the carbohydrates and for the preparation of regenerated carbohydrates, in particular in the form of regenerated cellulose fibers, is moreover described. The invention accordingly also provides such spun fibers as are distinguished in that they are non-fibrillating.
    Type: Grant
    Filed: December 22, 2006
    Date of Patent: April 24, 2012
    Assignee: BASF Aktiengesellschaft
    Inventors: Veit Stegmann, Klemens Massonne, Matthias Maase, Eric Uerdingen, Michael Lutz, Frank Hermanutz, Frank Gaehr
  • 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: 8092732
    Abstract: The present invention provides a processing method of the natural cellulose fiber with feature for enhancing the capability of antifungi, antibacteria and deodorization. The procedure is that firstly modify and reduce the properties of the natural chitosan of high polymer material to nanometer scale; secondly dunk the chitosan into the syrup-like mixture of wood pulp and NMMO solvent to yield quasi-dope; thirdly dehydrate the quasi-dope of paste mixture to form the mud-like dope; fourthly spin the dope by dryjet wet spinning method; fifthly regenerate the filament in coagulation bath, water rinse and dry; finally water rinse, dry, apply the lubricant to finish. The water soluble chitosan, which has been treated by property modification and reduced to nanometer scale, can effectively and completely solve in the cellulose of low DP to offer wider extent of selection in the DP and better flexibility of adding percentage in content of modified chitosan.
    Type: Grant
    Filed: December 31, 2008
    Date of Patent: January 10, 2012
    Assignee: Acelon Chemical and Fiber Corporation
    Inventors: Wen-Tung Chou, Ming-Yi Lai, Kun-Shan Huang
  • Publication number: 20110263840
    Abstract: A method for the spinning of a fibre comprising cellulose nano-fibrils being aligned along the main axis of the fibre from a lyotropic suspension of cellulose nano-fibrils, said nano-fibril alignment being achieved through extension of the extruded fibre from a die, spinneret or needle, wherein said fibre is dried under extension and the aligned nano-fibrils aggregate to form a continuous structure. The fibrils used in this method can be extracted from a cellulose-rich material such as wood. The invention also related to a cellulose-based fibre obtained according to this method and to a cellulose fibre which contains at least 90% wt of crystallised cellulose.
    Type: Application
    Filed: October 9, 2009
    Publication date: October 27, 2011
    Applicant: SAPPI NETHERLANDS SERVICES B.V.
    Inventors: Philip Turner, Zurine Hernandez, Callum Hill
  • Publication number: 20110200809
    Abstract: The invention provides a way of using cellulose triacetate (CTA) made from softwood pulp to make films suitable for use in liquid crystal displays (LCDs). It has been surprisingly found that a combination of certain additives in the film casting dope and of metal and sulfur content of the CTA allow a softwood CTA to exhibit peeling characteristics from the casting substrate that are similar to those of lint-based CTA of similar sulfur content. The additives include a combination of acid scavengers and chelating agents.
    Type: Application
    Filed: January 18, 2011
    Publication date: August 18, 2011
    Applicant: Eastman Chemical Company
    Inventors: Darryl Aubrey Godfrey, Laurel Leigh Reitfort
  • Patent number: 7914712
    Abstract: A cellulose acylate film characterized in that it has a shear rate dependency of melt viscosity of 0.1 to 2 and/or a temperature dependency of melt viscosity of 0.1 to 3. The cellulose acylate film is capable of suppressing generation of cutting wastage at the time of cutting.
    Type: Grant
    Filed: May 24, 2006
    Date of Patent: March 29, 2011
    Assignee: Fujifilm Corporation
    Inventor: Kiyokazu Hashimoto
  • Patent number: 7892470
    Abstract: A casting film is formed by casting a dope containing a polymer and a solvent onto a support. Thereafter, the casting film is peeled off from the support as a wet film (74). The wet film (74) is transported to a tenter device (47) having plural tenter clips (101). Before holding side edges of the wet film (74) by the tenter clips (101), air is blown from an outlet (120a) of an air nozzle (120) to a curled portion (74a) such that the air is pressed against the curled portion (74a). Thereby, the curled portion (74a) is flattened to become an approximately flat portion (74b).
    Type: Grant
    Filed: September 26, 2006
    Date of Patent: February 22, 2011
    Assignee: Fujifilm Corporation
    Inventor: Kentarou Tanimura
  • Publication number: 20110036366
    Abstract: A filter material adapted for use as a filter element of a smoking article is provided, the filter material including at least one segment of fibrous tow having a plurality of degradable particles dispersed therein, the degradable particles comprising a starch material. Exemplary starch materials include naturally-occurring starch, hydroxyalkylated starch, starch esters, ionically modified starch, oxidized starch, hydrolyzed starch, plasticized starch, gelatinized starch, grafted starch, crosslinked starch, transglycosylated starch, starch ethers, and mixtures thereof, as well as blends of starch with other polymers. Filter elements and smoking articles, such as cigarettes, that contain the filter material are also provided. A method of preparing polymer fibers for use in filter elements is also provided, the method including adding the starch material to a fiber precursor solution prior to fiber extrusion or dry-blending the starch material with the polymer material to be formed into fibers.
    Type: Application
    Filed: August 11, 2009
    Publication date: February 17, 2011
    Inventor: Andries D. Sebastian
  • Publication number: 20110024931
    Abstract: A method for the production of molded bodies from a base substance, wherein the base substance is mixed with a solution for producing a molding solution, and the solution subsequently is at least partially removed from the mixture, and the molding solution is fed to a unit for molding, wherein the molding solution is diluted before molding.
    Type: Application
    Filed: February 6, 2009
    Publication date: February 3, 2011
    Applicant: LIST HOLDING AG
    Inventors: Andreas Diener, Oliver Tretzack, Helmut Schildknecht, Daniel Witte
  • 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: 20100113249
    Abstract: A batch mixture including ceramic-forming ingredients, a pore former, a binder comprising an ammonium salt of an alkylated cellulose binder, and a liquid vehicle, as defined herein. Also disclosed is a method for producing a ceramic precursor article as defined herein having excellent extrusion properties.
    Type: Application
    Filed: October 30, 2008
    Publication date: May 6, 2010
    Inventors: Patricia Ann Beauseigneur, Kevin Ying Chou
  • 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: 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
  • Publication number: 20090166916
    Abstract: The present invention provides a processing method of the natural cellulose fiber with feature for enhancing the capability of antifungi, antibacteria and deodorization. The procedure is that firstly modify and reduce the properties of the natural chitosan of high polymer material to nanometer scale; secondly dunk the chitosan into the syrup-like mixture of wood pulp and NMMO solvent to yield quasi-dope; thirdly dehydrate the quasi-dope of paste mixture to form the mud-like dope; fourthly spin the dope by dryjet wet spinning method; fifthly regenerate the filament in coagulation bath, water rinse and dry; finally water rinse, dry, apply the lubricant to finish. The water soluble chitosan, which has been treated by property modification and reduced to nanometer scale, can effectively and completely solve in the cellulose of low DP to offer wider extent of selection in the DP and better flexibility of adding percentage in content of modified chitosan.
    Type: Application
    Filed: December 31, 2008
    Publication date: July 2, 2009
    Applicant: Acelon Chemical and Fiber Corporation
    Inventors: Wen-Tung Chou, Ming-Yi Lai, Kun-Shan Huang
  • 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: 7470385
    Abstract: A cellulose acylate film is produced by using a cellulose acylate solution and forming a film consisting of two or more layers by the co-casting method. The cellulose acylate to be used is selected so that the association molecular weight of cellulose acylate due to the static light scattering in the solution forming the outer layer becomes smaller than the association molecular weight of cellulose acylate due to the static light scattering in the solution forming the inner layer.
    Type: Grant
    Filed: July 31, 2002
    Date of Patent: December 30, 2008
    Assignee: Fujifilm Corporation
    Inventor: Tsukasa Yamada
  • 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: 7250201
    Abstract: A production method of cellulose film wherein cellulose film is produced by preparing a polymer solution through dissolving cellulose ester in a solvent containing a prescribed organic solvent as the main component, forming a filmy object from the prepared polymer solution, and evaporating the solvent in the filmy object; the residual amount of the organic solvent is reduced while the film quality is not degraded, and the production efficiency is degraded to a least possible extent; a poor solvent, highest in boiling point among the materials contained in the solvent, is added in the content ranging from 0.1 wt % to 1.0 wt %, taking the total amount of the solvent in the prepared polymer solution to be 100 wt %; and the solubility of cellulose ester in the poor solvent is inferior to the solubility of the cellulose ester in the organic solvent which is the main component of the solvent.
    Type: Grant
    Filed: April 11, 2005
    Date of Patent: July 31, 2007
    Assignee: Fujifilm Corporation
    Inventors: Hidekazu Yamazaki, Toshikazu Nakamura, Hiroshi Miyachi
  • Patent number: 7214335
    Abstract: This invention relates to a method of preparing cellulose solution which is homogeneous at relatively low temperature, in which a small amount of cellulose powder or polyvinylalcohol is dissolved in the liquid-state, concentrated N-methylmorpholine-N-oxide (hereinafter, referred to as ‘NMMO’) so as to lower the solidifying temperature of NMMO, and then, the resulting solution and cellulose powder are fed into an extruder so as to be mixed, swollen and melted in the extruder.
    Type: Grant
    Filed: November 4, 2005
    Date of Patent: May 8, 2007
    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: 6974608
    Abstract: Disclosed is a cellulose ester film comprising a polymer prepared by polymerizing at least one ethylenically unsaturated monomer selected from vinyl esters, vinyl esters having a functional group, acrylic esters, and acrylic esters having a functional group, wherein the polymer has a weight average molecular weight of not more than 5,000.
    Type: Grant
    Filed: July 10, 2001
    Date of Patent: December 13, 2005
    Assignee: Konica Corporation
    Inventors: Kunio Shimizu, Toru Kobayashi
  • 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: 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
  • Publication number: 20040207110
    Abstract: In accordance with the present invention, lyocell products can be made with unbleached pulps resulting in products with high amounts of hemicellulose and high amounts of lignin as compared to conventional lyocell products. The lyocell products of the present invention are advantageously less expensive to produce but retain the desirable strength of conventional lyocell products.
    Type: Application
    Filed: April 16, 2003
    Publication date: October 21, 2004
    Inventors: Mengkui Luo, Amar Neogi
  • Publication number: 20040188881
    Abstract: A cellulose acylate film is produced by using a cellulose acylate solution and forming a film consisting of two or more layers by the co-casting method. The cellulose acylate to be used is selected so that the association molecular weight of cellulose acylate due to the static light scattering in the solution forming the outer layer becomes smaller than the association molecular weight of cellulose acylate due to the static light scattering in the solution forming the inner layer.
    Type: Application
    Filed: January 30, 2004
    Publication date: September 30, 2004
    Inventor: Tsukasa Yamada
  • Patent number: 6757116
    Abstract: A method of manufacturing a patterned data/information storage and retrieval medium in the form of an annular disk having an outer diameter, a central opening defining an inner diameter, and opposed first and second major surfaces, the method including inserting a smaller diameter cylindrical shaft of a stamping/imprinting tool in the central opening and biasing the inner diameter of the disk into contact with the cylindrical shaft at a pre-selected location along the inner diameter of the disk during stamping/imprinting of a pre-selected pattern such as a servo pattern in at least one of the first and second major surfaces of the disk, the biasing creating a space between the inner diameter of the disk and the surface of the cylindrical shaft which has a maximum width at a location diametrically opposite the pre-selected location.
    Type: Grant
    Filed: January 28, 2002
    Date of Patent: June 29, 2004
    Assignee: Seagate Technology LLC
    Inventors: Donald Everett Curtiss, Koichi Wago
  • Publication number: 20030168762
    Abstract: The present invention relates to a method for producing a continuously molded body (11) from an extrusion solution preferably containing water, cellulose and a tertiary amine. The extrusion solution is extruded through an extrusion duct orifice (10) to obtain a continuously molded body. The continuously molded body is passed through an air gap (12) 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: Application
    Filed: April 29, 2003
    Publication date: September 11, 2003
    Inventors: Stefan Zikeli, Friedrich Ecker
  • Patent number: 6582645
    Abstract: A method for producing a cellulose acylate film is disclosed. The method comprises the steps of, casting dope containing cellulose acylate on a surface of a metal support, peeling off a web formed by casting the dope from the metal support, contacting surface of the web which has been contacted with the surface of the metal support, with a first roller just after the peeling off of the web from the metal support surface, consequently, contacting the surface of the web which has been exposed to air on the metal support, with a second roller, and drying the peeled web.
    Type: Grant
    Filed: January 12, 2001
    Date of Patent: June 24, 2003
    Assignee: Konica Corporation
    Inventor: Akihiko Takeda
  • Patent number: 6548660
    Abstract: A producing method of a cellulose polymer powder is provided, which comprises dissolving a cellulose polymer by exposure to an organic solvent containing, as the main component, an ester-based solvent having from 2 to 8 carbon atoms, a ketone-based solvent having from 4 to 10 carbon atoms, or an alcohol-based solvent having from 3 to 6 carbon atoms, and carbon dioxide, and then removing the carbon dioxide and the organic solvent from the solution. A producing method of an organic solvent solution of a cellulose polymer is also provided.
    Type: Grant
    Filed: December 7, 2000
    Date of Patent: April 15, 2003
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Tadahisa Sato, Katsuyoshi Yamakawa, Hiroshi Onishi, Tadahiro Tsujimoto
  • Patent number: 6368534
    Abstract: This invention relates to a solution casting process capable of decreasing uneven coating of a functional layer upon applying the functional layer onto a film surface, which comprises casting a solution of polymer dissolved in organic solvent into a film by extruding from a die onto a support, wherein the length of the film from the die opening to the landing of the film on the support is controlled to 3 to 40 mm.
    Type: Grant
    Filed: July 7, 2000
    Date of Patent: April 9, 2002
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Toshikazu Nakamura, Yukihiro Katai
  • Patent number: 6316582
    Abstract: The present invention relates to a method of reducing the clogging of nozzles and slits and diminishing the formation of deposits in the spin bath system in the process of making viscose filamentary and film materials by using an alkoxylated polyamine surfactant having the formula: RNA&Parenopenst;CnH2nNA&Parenclosest;x−1A  (I) where R represents a hydrogen or an aliphatic group with 1-24 carbon atoms, each A represents a hydrogen, an aliphatic group with 1-24 carbon atoms, or H(OCmH2m)y-groups, where m is a number from 2-3, n is a number from 2-3, x is 4-8, with the proviso that the number of H(OCmH2m)y-groups are from 1 to x+1, and the total number of carbon atoms in the aliphatic groups is from 8 to 45. The alkoxylated polyamine surfactant has an excellent anticlogging effect, since it is a good dispersant and prevent or reduce precipitation in the spin bath. In addition it is very stable.
    Type: Grant
    Filed: June 1, 2000
    Date of Patent: November 13, 2001
    Assignee: Akzo Nobel N.V.
    Inventors: Kent Bjur, Anders Cassel, Margreth Strandberg, Ingemar Uneback
  • Patent number: 6139785
    Abstract: The present invention provides a cellulose ester composition, containing 1 to 99% by weight of cellulose triacetate prepared by substituting hydroxyl groups of cellulose with acetyl and having a degree of substitution with acetyl, DSace, which satisfies the relationship: 2.7.ltoreq.DSace.ltoreq.3.0, and 99 to 1% by weight of a mixed fatty acid ester of cellulose prepared by substituting hydroxyl groups of cellulose with acetyl and acyl groups having three or more carbon atoms and having degrees of substitution with acetyl and acyl groups having three or more carbon atoms, DSace and DSacyl, respectively, which satisfy the relationships: (I) 2.20.ltoreq.DSace.ltoreq.2.95, (II) 0.05.ltoreq.DSacyl.ltoreq.0.80 and (III) 2.60.ltoreq.DSace+DSacyl.ltoreq.3.00.
    Type: Grant
    Filed: March 19, 1999
    Date of Patent: October 31, 2000
    Assignee: Daicel Chemical Industries, Ltd.
    Inventors: Yuichiro Shuto, Hiroki Taniguchi, Yukiko Nakanishi, Masahiko Murayama
  • Patent number: 6019925
    Abstract: A method for producing cellulosic dialysis membranes in the form of flat, tubular, or hollow fiber membranes by spinning a spinning solution of cellulose and/or modified cellulose, a tertiary amine oxide, and additional liquids and additives such as stabilizers, pore formers and the like is provided. The method operates at high takeoff speed and produces membranes for the low, middle, and high flux ranges. The membranes show practically no aging and have a stable structure. The oxidative breakdown of cellulose in the manufacture of the membranes is extremely low and hemocompatability is very good.
    Type: Grant
    Filed: May 15, 1997
    Date of Patent: February 1, 2000
    Assignee: Akzo Nobel NV
    Inventors: Michael Diamantoglou, Martin Nywlt, Winfried Holz
  • Patent number: 5976440
    Abstract: A spinning dope for the stable production of a cellulose diacetate fiber at a high productivity rate, such fiber being almost free from the occurrence of fluffs and excellent in strength and elongation properties. The spinning dope is a composition formed of (1) acetone or a solvent containing acetone and 0 to 5% by weight, based on the acetone, of water or methanol, (2) 24 to 33% by weight, based on the total weight of the composition, of cellulose diacetate, and (3) at least a phthalate ester, an aliphatic dibasic acid ester, a fatty acid ester, a phosphate ester, an epoxy plasticizer or a glycol-ester-containing plasticizer; and the composition has a thixotropy index (I), represented by the following equation, of at least 1.3,I=.eta..sub.6 /.eta..sub.60wherein .eta..sub.6 and .eta..sub.60 are viscosity measured with a Brookfield viscometer at a rotor rotation of 6 rpm and 60 rpm, respectively, and 35.degree. C.
    Type: Grant
    Filed: May 20, 1998
    Date of Patent: November 2, 1999
    Assignee: Teijin Limited
    Inventors: Mie Yoshimura, Toshimasa Kuroda
  • Patent number: 5811162
    Abstract: A food casing based on cellulose hydrate, which is preferably used as a sausage casing, in addition to cellulose hydrate, includes a copolymer having units of methyl vinyl ether and maleic acid and/or alkali metal maleate. It can additionally contain further polymers.
    Type: Grant
    Filed: August 1, 1996
    Date of Patent: September 22, 1998
    Assignee: Kalle Nalo GmbH
    Inventors: Klaus-Dieter Hammer, Theo Krams, Martina Koenig
  • Patent number: 5783121
    Abstract: A preparation of a polymer solution comprising the steps of: mixing a polymer with a solvent to swell the polymer in the solvent; cooling the swelled mixture to a temperature of -100.degree. to -10.degree. C.; and then warming the cooled mixture to a temperature of 0.degree. to 120.degree. C. to dissolve the polymer in the solvent. The swelled mixture is cooled at a rate of faster than 1.degree. C. per minute, or the cooled mixture is warmed at a rate of faster than 1.degree. C. per minute. Apparatuses for the preparation of a polymer solution are also disclosed.
    Type: Grant
    Filed: December 5, 1996
    Date of Patent: July 21, 1998
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Hidekazu Yamazaki, Tadahiro Tsujimoto, Yukihiro Katai
  • Patent number: 5747125
    Abstract: A crosslinked cellulose composite film including a regenerated cellulose matrix containing a uniform dispersion of hemp fibers and a poly(ethylene oxide) plasticizer. A method for forming the film includes mixing a slurry of the hemp, poly(ethylene oxide) and a cellulose solvent with a cellulose solution, extruding the mixture, regenerating the cellulose from the solution to form the matrix containing hemp fibers, contacting with a crosslinking agent and then drying.
    Type: Grant
    Filed: July 18, 1996
    Date of Patent: May 5, 1998
    Assignee: Viskase Corporation
    Inventor: John Markulin
  • Patent number: 5733663
    Abstract: To produce a composite membrane, the solution of a polymer in a volatile organic solvent is spread on water, the solvent is allowed to evaporate, the polymer is crosslinked and the polymer film formed is transferred to a porous support membrane. The polymer is preferably a polysiloxane which is cross-linked via polymer-bonded OH groups. The composite membrane is suitable, inter alia, for pervaporation.
    Type: Grant
    Filed: July 25, 1997
    Date of Patent: March 31, 1998
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Ude Scheunemann, Olaf Althoff, Werner Hickel, Gunther Appel, Jacqueline Bauer, Gerhard Geiss
  • Patent number: 5688455
    Abstract: A method of making a cellulose triacetate photographic film support by forming a dope solution of cellulose triacetate in a first solvent, passing the dope solution under pressure through a sheet forming die zone having an upper and lower surface and two edge surfaces, injecting a second solvent into the dope solution at the edge surfaces within the die zone in an amount sufficient to form a slip layer at the two edge surfaces, exiting the dope solution from the sheet forming die zone and separating the solvent from the cellulose triacetate.
    Type: Grant
    Filed: January 29, 1996
    Date of Patent: November 18, 1997
    Assignee: Eastman Kodak Company
    Inventors: Randall Joseph Kehl, Eric Eugene Arrington
  • Patent number: 5686036
    Abstract: The invention provides a method of making a cellulose triacetate photographic film base which comprises providing a casting composition of cellulose triacetate, plasticizer, and solvent having a cellulose triacetate and plasticizer concentration of from 36% to 72% by weight, casting the coating composition at a temperature of from 40.degree. C. to 63.degree. C. unto a surface maintained at from -70.degree. C. to 21.degree. C. for a residence time from 3 to 8 seconds, in accordance with the equation Tr/Tg<1.9, where Tg and Tr are the glass transition temperature in degrees Kelvin and the temperature of the casting composition in degrees Kelvin at a point adjacent to the surface where the film base is separated from the surface.
    Type: Grant
    Filed: January 11, 1996
    Date of Patent: November 11, 1997
    Assignee: Eastman Kodak Company
    Inventor: Eric Eugene Arrington
  • Patent number: 5656224
    Abstract: The invention is concerned with a process for the production of a suspension of cellulose in a liquid, aqueous tertiary amine-oxide, wherein shredded cellulose is mixed with the liquid, aqueous tertiary amine-oxide, said process comprising:(A) contacting the shredded cellulose with the liquid, aqueous tertiary amine-oxide, a first mixture being prepared, and(B) spreading this first mixture mechanically as a layer on a surface and transporting it along this surface while intensively being mixed, until a homogeneous suspension is produced which is removed from the surface, wherein(C) measures (A) and (B) are carried out continuously.
    Type: Grant
    Filed: June 5, 1995
    Date of Patent: August 12, 1997
    Assignee: Lenzing Aktiengesellschaft
    Inventors: Stefan Zikeli, Peter Hinterholzer
  • Patent number: 5626810
    Abstract: A process is disclosed for the preparation of a shapeable solution of cellulose in an aqueous tertiary amine-oxide from comminuted cellulose. The process includes introducing previously comminuted cellulose material into an aqueous solution of a tertiary amine-oxide to prepare an initial suspension, subjecting the initial suspension to high-consistency milling to further break-up the cellulose material to obtain a second suspension, and converting the second suspension into a shapeable solution of cellulose by heating under reduced pressure.
    Type: Grant
    Filed: March 10, 1994
    Date of Patent: May 6, 1997
    Assignee: Lenzing Aktiengesellschaft
    Inventors: Stefan Zikeli, Peter Hinterholzer
  • Patent number: 5553835
    Abstract: Solvent based film is produced in an endless belt casting apparatus (10) in which, within initial compartments (46-52), flows of gas are directed through transversely elongated inlet channels (85.sub.i) to contact a layer (36') of polymer and solvent supported by an endless belt (26) and flows of gas and solvent vapors are withdrawn from the vicinity of the layer by transversely elongated gas plenums (68); within subsequent compartments (54-62), flows of gas are directed through elongated inlet plenums (74) to contact the layer and flows of gas and solvent vapors are withdrawn through transversely elongated exhaust channels (85.sub.o); within all compartments along upper and lower spans of the belt, flows of gas are directed at the inner side (30) of the belt from transversely elongated gas plenums (70) and flows of gas are withdrawn though outlets (72); and within initial compartments (46-52), flows of cooling gas are directed at the edges of the inner side of the belt from cooling nozzles (146,148).
    Type: Grant
    Filed: April 7, 1995
    Date of Patent: September 10, 1996
    Assignee: Eastman Kodak Company
    Inventors: Carl F. Dresie, Edward S. Jones, Stephen R. Shelley, Kurt H. Strobl, Shamal L. Suthar, Harold C. Worden