Ethers Patents (Class 536/84)
  • Patent number: 10098907
    Abstract: The present invention provides a method of treating constipation and compositions useful in said method. The method comprises administering to a subject in need thereof an effective amount of a crosslinked carboxymethylcellulose having high elastic modulus coupled with high absorbance capacity when swollen in simulated gastric fluid/water (1:8) and simulated intestinal fluids.
    Type: Grant
    Filed: April 24, 2017
    Date of Patent: October 16, 2018
    Assignee: GELESIS LLC
    Inventors: Alessandro Sannino, Christian Demitri, Yishai Zohar, Eyal S. Ron, Barry J. Hand, Cosimo Saponaro
  • Patent number: 9675998
    Abstract: Provided herein are formaldehyde-free flame retardant compositions, comprising a flame retardant acid and a fixing agent; and methods of their use for manufacturing durable formaldehyde-free flame retardant cellulosic materials. Also provided herein are durable formaldehyde-free flame retardant cellulosic materials and articles comprising the same.
    Type: Grant
    Filed: March 13, 2013
    Date of Patent: June 13, 2017
    Assignee: WINNITEX LIMITED
    Inventors: James R. Johnson, Kenneth Y. M. Chan, Charles Wang
  • Patent number: 9512238
    Abstract: A cellulose resin produced by binding cardanol or a derivative thereof to cellulose or a derivative thereof with the use of a cellulose hydroxy group of the cellulose or a derivative thereof and the phenolic hydroxy group of the cardanol or a derivative thereof.
    Type: Grant
    Filed: November 14, 2014
    Date of Patent: December 6, 2016
    Assignee: NEC CORPORATION
    Inventors: Masatoshi Iji, Sungil Moon, Shukichi Tanaka, Hiroyuki Kai
  • Patent number: 9416199
    Abstract: The present invention relates to a method for producing an alkali cellulose with suppressed decrease in the degree of polymerization as well as with small use amount of a basic compound, and to a method for producing a cellulose ether by using the alkali cellulose thus obtained. Provided by the present invention are: (A) a method for producing an alkali cellulose, comprising Step 1 wherein a cellulose-containing raw material is pulverized in the presence of 0.6 to 1.
    Type: Grant
    Filed: April 27, 2012
    Date of Patent: August 16, 2016
    Assignee: KAO CORPORATION
    Inventors: Eisuke Miyoshi, Yutaka Yoshida, Ryo Miyasato, Kenichi Shiba, Rui Takahashi, Yoichiro Imori
  • Patent number: 9382337
    Abstract: A process for making a hydrogel forming material from an unbleached cellulose pulp comprised of isolating pulp fines from the cellulose pulp by screening and/or dissolved air filtration, reacting the isolated pulp fines with alkaline hydroxide to form an alkali cellulose composition, preparing a heterogeneous mixture of the alkali cellulose composition and an etherifying agent, and optionally organic cross-linking agent, and reacting the components of the mixture to produce a hydrogel forming material. A polyvalent metal cross-linking agent can optionally be reacted with the hydrogel forming material to enhance its gel strength.
    Type: Grant
    Filed: December 9, 2014
    Date of Patent: July 5, 2016
    Assignee: Rayonier Performance Fibers, LLC
    Inventors: Othman A. Hamed, Romuald S. Krzywanski
  • Patent number: 9359450
    Abstract: The amount of water-insoluble fibers in a water-soluble cellulose derivative is reduced in a process comprising the steps of a) providing a water-soluble cellulose derivative having a residual amount of at least 20 ppm by weight of water-insoluble fibers in a 2 weight percent aqueous solution of the water-soluble cellulose derivative; b) mixing the water-soluble cellulose derivative of step a) with a liquid in a compounder to provide a moist water-soluble cellulose derivative having a temperature of at least 50 C and a moisture content of from 35 to 90 percent, based on the total weight of the moist cellulose derivative; and c) drying-grinding the mixture of step b) in a gas-swept impact mill to obtain a dried and ground cellulose derivative.
    Type: Grant
    Filed: March 29, 2012
    Date of Patent: June 7, 2016
    Inventors: Yvonne M. Goerlach-Doht, Juergen Hermanns, Peter E. Pierini
  • Patent number: 9198868
    Abstract: The present disclosure relates to aqueous compositions for use in the manufacture of capsule shells endowed with bulk enteric properties. The present disclosure also relates, in part, to aqueous dispersions suitable for the implementation of said manufacturing process, and to enteric capsule shells and hard capsules obtained therewith.
    Type: Grant
    Filed: October 24, 2011
    Date of Patent: December 1, 2015
    Assignee: Capsugel Belgium NV
    Inventors: Hassan Benameur, Dominique Nicolas Cade, Sophie Schreiber
  • Patent number: 8993747
    Abstract: The present invention relates to a process for the production of alkali cellulose for the production of alkali cellulose and, optionally, cellulose ethers from cellulose in the presence of alkali and, if applicable, with alkylating and/or hydroxyalkylating agent(s) comprising the reaction of a cellulose with an alkali metal hydroxide, wherein the alkali metal hydroxide is mixed with cellulose in a mixing apparatus, the mixing apparatus (1) having an upper region (20, 102a, 202a) with a first cross-section and a lower region (21, 102b, 202b) with a second cross-section, the second cross-section being the same as or smaller than the first cross-section and comprising at least one non-horizontally oriented mixing device (23, 27, 121, 221, 224).
    Type: Grant
    Filed: January 8, 2010
    Date of Patent: March 31, 2015
    Assignee: Dow Global Technologies LLC
    Inventors: Matthias Sprehe, Bettina Hoelzer
  • Publication number: 20150059619
    Abstract: The present disclosure is directed to methods for producing a very low viscosity cellulose ether having little or no discoloration and cellulose ether products resulting therefrom. The method includes contacting a cellulose ether with an oxidizing agent and an acid to form a mixture. The mixture is then heated and neutralized. The method includes adding a second oxidizing agent to the mixture and forming a very low viscosity cellulose ether having a viscosity from 1.2 cP to less than 2 cP. The very low viscosity ether may also have an APHA color value of 1 to 100.
    Type: Application
    Filed: November 12, 2014
    Publication date: March 5, 2015
    Inventor: Charles B. Mallon
  • Patent number: 8916700
    Abstract: The present invention relates to a process for selectively producing a cellulose ether derivative with a very high reaction efficiency of an organohalide compound. There is provided a process for producing a cellulose ether derivative such as carboxymethyl cellulose and hydroxyethyl cellulose in which a low-crystalline powdery cellulose having a crystallinity of 50% or less is reacted with an organohalide compound such as ethylene chlorohydrin, a monohaloacetic acid and a salt of the monohaloacetic acid in the presence of a base.
    Type: Grant
    Filed: November 11, 2008
    Date of Patent: December 23, 2014
    Assignee: Kao Corporation
    Inventors: Munehisa Okutsu, Takeshi Ihara
  • Patent number: 8900706
    Abstract: A process for producing cellulose nanocrystals (CNCs) involves providing a cellulosic material, contacting the cellulosic material with an inorganic persulfate at an elevated temperature to produce CNCs, and recovering the CNCs. The process permits one-step production of CNCs from vegetative biomasses such as flax and hemp. Cellulose nanocrystals produced by the process with carboxylic groups are more uniform and have higher aspect ratios than CNCs produced by prior art processes.
    Type: Grant
    Filed: March 15, 2010
    Date of Patent: December 2, 2014
    Assignee: National Research Council of Canada
    Inventors: Chi Woon Leung, John H. T. Luong, Sabahudin Hrapovic, Edmond Lam, Yali Liu, Keith B. Male, Khaled Mahmoud, Denis Rho
  • Patent number: 8864943
    Abstract: Provided is a method for preparing nonionic water-soluble cellulose ether having low insoluble content and providing a transparent solution. More specifically, provided is a method for preparing nonionic water-soluble cellulose ether comprising at least the steps of: drying a pulp sheet or pulp chips into which the pulp sheet has been converted, bringing the dried pulp sheet or pulp chips into contact with an alkali metal hydroxide solution to obtain alkali cellulose, draining the alkali cellulose, and reacting the drained alkali cellulose with an etherifying agent.
    Type: Grant
    Filed: August 28, 2012
    Date of Patent: October 21, 2014
    Assignee: Shin-Etsu Chemical Co., Ltd.
    Inventor: Mitsuo Narita
  • Patent number: 8865889
    Abstract: The invention is a method for efficiently preparing alkali cellulose having a uniform alkali distribution therein. More specifically, the invention is a method for preparing alkali cellulose comprising steps of bringing pulp into continuous contact with an alkali metal hydroxide solution in a rotary feeder type contactor to generate a contact mixture, and draining the contact mixture; and a method for preparing cellulose ether comprising use of the alkali cellulose thus prepared; an apparatus for preparing alkali cellulose, comprising a rotary feeder comprising a cyclic housing comprising an inlet port and an outlet port, a cyclic contact drum being circularly rotatable along the housing in the housing and comprising a plurality of filter cells arranged in a circumferential direction, and a filtrate-discharging tube being disposed in a diameter direction inside of the cyclic contact drum and collecting the filtrate which has passed the filter, and a drainer for draining a cake discharged from the contactor.
    Type: Grant
    Filed: December 21, 2006
    Date of Patent: October 21, 2014
    Assignee: Shin-Etsu Chemical Co., Ltd.
    Inventors: Mitsuo Narita, Masaki Tabata, Atsushi Yoshida, Hiroshi Umezawa
  • Patent number: 8853388
    Abstract: The invention is a method for efficiently preparing alkali cellulose having a uniform alkali distribution therein. More specifically, the invention is a method for preparing alkali cellulose comprising steps of bringing pulp into continuous contact with an alkali metal hydroxide solution in a pipe type contactor to generate a contact mixture and draining the contact mixture; a method for preparing cellulose ether comprising use of the alkali cellulose; and an apparatus for preparing alkali cellulose, comprising a pipe type contactor having at least one inlet port at one end thereof for introducing pulp and an alkali metal hydroxide solution, and an outlet port at the other end for discharging a contact mixture, wherein the pulp and the alkali metal hydroxide solution are moved from one end to the other end while bringing them into contact with each other, and a drainer for separating a cake from the contact mixture discharged from the contactor.
    Type: Grant
    Filed: December 22, 2006
    Date of Patent: October 7, 2014
    Assignee: Shin-Etsu Chemical Co., Ltd.
    Inventors: Mitsuo Narita, Masaki Tabata, Atsushi Yoshida, Hiroshi Umezawa
  • Patent number: 8821689
    Abstract: A composition comprising starch, a biogum and water subjected to heat, shearing and optionally depolymerization is provided which is useful as a stable high solids dispersion useful in various applications including as wet-end additives for paper making.
    Type: Grant
    Filed: July 26, 2013
    Date of Patent: September 2, 2014
    Assignee: Penford Products Co.
    Inventors: Daryl Holland, Edward P. Pauley, Joseph S. Squires
  • Publication number: 20140154756
    Abstract: Processes disclosed are capable of converting biomass into high-crystallinity nanocellulose with surprisingly low mechanical energy input. In some variations, the process includes fractionating biomass with an acid (such as sulfur dioxide), a solvent (such as ethanol), and water, to generate cellulose-rich solids and a liquid containing hemicellulose and lignin; and mechanically treating the cellulose-rich solids to form nanofibrils and/or nanocrystals. The total mechanical energy may be less than 500 kilowatt-hours per ton. The crystallinity of the nanocellulose material may be 80% or higher, translating into good reinforcing properties for composites. The nanocellulose material may include nanofibrillated cellulose, nanocrystalline cellulose, or both. In some embodiments, the nanocellulose material is hydrophobic via deposition of some lignin onto the cellulose surface.
    Type: Application
    Filed: November 27, 2013
    Publication date: June 5, 2014
    Applicant: API Intellectual Property Holdings, LLC
    Inventors: Kimberly NELSON, Theodora RETSINA, Vesa PYLKKANEN, Ryan O'CONNOR
  • Patent number: 8691052
    Abstract: The invention relates to a stable aqueous slurry composition comprising clay or clay-like material, hydrophobically associative polymer, and optionally a surfactant; and a method of inhibiting the deposition of organic contaminants in pulp and papermaking applications.
    Type: Grant
    Filed: March 13, 2009
    Date of Patent: April 8, 2014
    Assignee: Hercules Incorporated
    Inventors: Fushan Zhang, William S. Carey, Erin A. S. Doherty, John Todd Sarraf
  • Patent number: 8598336
    Abstract: A cellulose derivative and a resin composition having good thermoplasticity, strength, and elongation at break and therefore suited to molding processing are provided. The cellulose derivative is derived by replacing at least part of the hydrogen atoms of the hydroxyl groups of cellulose with a hydrocarbon group and an aliphatic or aromatic oxycarbonyl group.
    Type: Grant
    Filed: September 28, 2009
    Date of Patent: December 3, 2013
    Assignee: Fujifilm Corporation
    Inventors: Yutaka Nozoe, Toshihide Yoshitani
  • Publication number: 20130310519
    Abstract: A cellulose resin produced by binding cardanol or a derivative thereof, and a flexible component to cellulose or a derivative thereof.
    Type: Application
    Filed: July 6, 2011
    Publication date: November 21, 2013
    Applicant: NEC CORPORATION
    Inventors: Shukichi Tanaka, Masatoshi Iji, Sungil Moon
  • Patent number: 8580950
    Abstract: Novel aldehyde-functionalized polysaccharide compositions containing pendant dialdehyde groups are described that are more stable in aqueous solution than oxidized polysaccharides. The aldehyde-functionalized polysaccharides may be reacted with various amine-containing polymers to form hydrogel tissue adhesives and sealants that may be useful for medical applications such as wound closure, supplementing or replacing sutures or staples in internal surgical procedures such as intestinal anastomosis and vascular anastomosis, tissue repair, preventing leakage of fluids such as blood, bile, gastrointestinal fluid and cerebrospinal fluid, ophthalmic procedures, drug delivery, and preventing post-surgical adhesions.
    Type: Grant
    Filed: December 21, 2010
    Date of Patent: November 12, 2013
    Assignee: Actamax Surgical Materials, LLC
    Inventors: Helen S. M. Lu, Steven W. Shuey
  • Patent number: 8580951
    Abstract: Novel aldehyde-functionalized polysaccharide compositions are described that are more stable in aqueous solution than oxidized polysaccharides or other types of polysaccharides containing pendant aldehyde groups. The aldehyde-functionalized polysaccharides may be reacted with various amine-containing polymers to form hydrogel tissue adhesives and sealants that may be useful for medical applications such as wound closure, supplementing or replacing sutures or staples in internal surgical procedures such as intestinal anastomosis and vascular anastomosis, tissue repair, preventing leakage of fluids such as blood, bile, gastrointestinal fluid and cerebrospinal fluid, ophthalmic procedures, drug delivery, and preventing post-surgical adhesions.
    Type: Grant
    Filed: July 1, 2010
    Date of Patent: November 12, 2013
    Assignee: Actamax Surgical Materials, LLC
    Inventors: Helen S. M. Lu, Steven W. Shuey
  • Patent number: 8569479
    Abstract: A process for reducing the average molecular weight of a cellulose ether comprises the step of contacting a cellulose ether with an acid to partially depolymerize it to a lower molecular weight in a diluent comprising at least 50 weight percent of an organic hydroxylic compound having at least one hydroxy group and at least two carbon atoms.
    Type: Grant
    Filed: April 23, 2007
    Date of Patent: October 29, 2013
    Assignee: Dow Global Technologies, LLC
    Inventor: Charles B. Mallon
  • Patent number: 8569263
    Abstract: A method of producing silane-modified cationized cellulose that has excellent aqueous dispersibility, including: a step (1) of cationizing water-soluble cellulose ether in a presence of alkali in a mixed solvent of a water-compatible organic solvent to obtain slurry comprising cationized cellulose; a step (2) of adding acid to said slurry and neutralizing said alkali; a step (3) of reacting said cationized cellulose obtained after said neutralization with an aminosilane compound and a step (4) of drying the obtained slurry, wherein: drying is conducted in step (4) at 115-160° C. until weight loss on drying is 5% by weight or less, or there is also including a step (5) of adding a water-compatible organic solvent or a mixed solvent of a water-compatible organic solvent and water to the cationized cellulose after the neutralization so that water content in a whole solvent that contacts the cationized cellulose is 10% by mass or less.
    Type: Grant
    Filed: August 22, 2008
    Date of Patent: October 29, 2013
    Assignee: LION Corporation
    Inventors: Youichirou Kohno, Yoko Osako, Atsushi Ito
  • Patent number: 8541571
    Abstract: The invention is directed to a simple and new method for the homogeneous synthesis of cellulose ethers. Ionic liquids are not only used as solvent, but also as reaction media for the homogeneous etherification of cellulose. The dissolved cellulose is treated with the etherification agent in the absence of organic and/or inorganic bases and in the absence and/or in the presence of moderate amounts of water. The obtained cellulose ethers show new distributions of substitution on the polymer chain, resulting in new properties and applications.
    Type: Grant
    Filed: February 25, 2009
    Date of Patent: September 24, 2013
    Assignee: SE Tylose GmbH & Co. KG
    Inventors: Eugen Moellmann, Thomas Heinze, Tim Liebert, Sarah Koehler
  • Patent number: 8496782
    Abstract: Provided is a method for preparing cellulose ether which is transparent as dissolved in water and has low water-insoluble content. More specifically, provided are a method for preparing alkali cellulose comprising a contact step of bringing a pulp sheet having a pore volume of 1.0 ml/g or greater, or chips into which the pulp sheet has been converted, into contact with an alkali metal hydroxide solution to obtain an alkali cellulose reaction mixture, and a drain step of draining the alkali cellulose reaction mixture; and a method for preparing water-soluble cellulose ether comprising a step of reacting the alkali cellulose with an etherifying agent.
    Type: Grant
    Filed: December 9, 2008
    Date of Patent: July 30, 2013
    Assignee: Shin-Etsu Chemical Co., Ltd.
    Inventor: Mitsuo Narita
  • Patent number: 8487089
    Abstract: The present invention relates to a water-soluble associative cellulose ether having a DP viscosity from 250 to 20,000 mPa·s, measured at a concentration of 1% by weight, and a molecular substitution, MS, from 0.0001 to 0.005 of a hydrophobic substituent containing an unsubstituted or substituted hydrocarbon group of 8-24 carbon atoms. The cellulose ether has a good thickening effect and advantageous application properties at low contents and can be used in an aqueous decorative paint composition, an aqueous paper coating composition, an aqueous organic filler composition, an aqueous cement slurry, an aqueous detergent composition or an aqueous personal care formulation.
    Type: Grant
    Filed: December 15, 2004
    Date of Patent: July 16, 2013
    Assignee: Akzo Nobel N.V.
    Inventors: Peter Boström, Leif Karlson
  • Publication number: 20130172290
    Abstract: A process for treating a polysaccharide with a dialdehyde in the presence of from 10 to 40 weight percent of water, based on the total weight of polysaccharide and water, is beneficially conducted in a mixing device characterized by a FROUDE number FRw of larger than 11, wherein ?w is the angular frequency in sec-1 and is defined as 2*?*RPM/60, RPM is the rotational speed of the mixing device in revolutions per minute, Rw is the radius of the mixing device in m, and g is the acceleration due to gravity in m/s2.
    Type: Application
    Filed: September 15, 2011
    Publication date: July 4, 2013
    Applicant: Dow Global Technologies LLC
    Inventors: Alexandra Hild, Matthias Sprehe, Axel Altmann, Roland Adden
  • Patent number: 8440817
    Abstract: The present invention relates to a process for efficiently producing methyl cellulose in an industrially convenient manner. The production process of the present invention includes the step of reacting cellulose with methanol in a subcritical state.
    Type: Grant
    Filed: December 18, 2008
    Date of Patent: May 14, 2013
    Assignee: Kao Corporation
    Inventor: Munehisa Okutsu
  • Publication number: 20120328877
    Abstract: The present invention is cellulose nanofibers having an average polymerization degree of 600 to 30000, an aspect ratio of 20 to 10000, an average diameter of 1 nm to 800 nm, and an I?-type crystal peak in an X-ray diffraction pattern.
    Type: Application
    Filed: September 5, 2012
    Publication date: December 27, 2012
    Applicant: Olympus Corporation
    Inventors: KOHEI SHIRAMIZU, Naohito Shiga, Takashi Magara, Kohei Oguni, Lianzhen Lin
  • Patent number: 8324377
    Abstract: A water-soluble cellulose ether is separated from its suspension by passing a suspension of water-soluble cellulose ether particles in water through a filter of perforated metallic or ceramic filter medium under pressure, removing the filter cake of water-soluble cellulose ether from the filter medium, and cleaning the filter medium with steam, compressed air or water under pressure. The invention enables to separate a water-soluble cellulose ether, especially having a high dissolution temperature, avoids the filter from being clogged, and extends the operative time of the filter.
    Type: Grant
    Filed: November 1, 2005
    Date of Patent: December 4, 2012
    Assignee: Shin-Etsu Chemical Co., Ltd.
    Inventors: Kazuhisa Hayakawa, Shinichi Kurotani, Mitsuo Narita
  • Publication number: 20120214980
    Abstract: Provided is a method for efficiently preparing alkali cellulose having a uniform alkali distribution. More specifically, provided are a methods for preparing alkali cellulose comprising a contact filtration step of bringing a pulp into contact with an alkali metal hydroxide solution on a moving filtration plane for vacuum filtration to collect a contact product remaining on the filtration plane, and a draining step of draining the contact product; and a method of preparing cellulose ether by using the alkali cellulose. Also provided is an apparatus for preparing alkali cellulose comprising a continuous horizontal vacuum filter type contactor.
    Type: Application
    Filed: February 16, 2012
    Publication date: August 23, 2012
    Applicant: SHIN-ETSU CHEMICAL CO., LTD.
    Inventor: Mitsuo Narita
  • Publication number: 20120214981
    Abstract: A degree of polymerization of cellulose ether is accurately controlled, and quality and a manufacturing process of the cellulose ether are stabilized. There is provided a method for producing depolymerized alkali cellulose having a degree of polymerization controlled, comprising at least a step of depolymerizing, in the presence of an oxygen-containing gas flow, alkali cellulose obtained by bringing a pulp into contact with an alkali solution, while measuring feeding and discharging amounts of oxygen in the oxygen-containing gas flow. There is also provided a method for producing cellulose ether, comprising at least a step of adding an etherifying agent to the depolymerized alkali cellulose having a degree of polymerization controlled.
    Type: Application
    Filed: February 16, 2012
    Publication date: August 23, 2012
    Applicant: SHIN-ETSU CHEMICAL CO., LTD.
    Inventor: Mitsuo NARITA
  • Publication number: 20120165518
    Abstract: A non-crosslinked, nonionic, water-soluble cellulose ether having a syneresis value of at least 25% by weight in which the hydrogen atom of a hydroxyl group is substituted by a C6-C26 alkyl halide, monoepoxide or monoisocyanate is useful as a binder in ceramic extrusion molding.
    Type: Application
    Filed: December 27, 2011
    Publication date: June 28, 2012
    Applicant: SHIN-ETSU CHEMICAL CO., LTD.
    Inventors: Shingo Niinobe, Kazuhisa Hayakawa
  • Publication number: 20120129954
    Abstract: Compositions comprising carboxypolysaccharides (CPS) including carboxymethyl cellulose (CMC) and polyethylene glycols (PEGs) are provided where the PEG is a PEG-epoxide covalently linked to the CPS. In certain embodiments, the PEG attaches to only one CPS, forming a decorated CPS. In other embodiments, bi-functional PEG molecules are attached to adjacent CPSs, thereby forming a covalently cross-linked composition. Additional embodiments include PEG/CMC compositions where the PEG is a multi-branch PEG and/or a multi-arm PEG. PEG/CMC compositions can be made with desired viscoelastic properties, and such compositions can be used as space-filling materials, load-bearing materials, anti-adhesion compositions, drug delivery vehicles or lubrication of tissues and medical instruments.
    Type: Application
    Filed: October 3, 2011
    Publication date: May 24, 2012
    Inventors: Samuel J. Falcone, Richard A. Berg
  • Patent number: 8173799
    Abstract: A composition of a loose mass of comminuted raw cotton linter fibers has a bulk density of at least 8 g/100 ml and at least 50% of the fibers in the mass passes through a US standard sieve size #10 (2 mm opening). This composition is made by obtaining a loose mass of first cut, second cut, third cut, or mill runs raw cotton linters or mixtures thereof and comminuting the loose mass of raw cotton linters to a size wherein at least 50% pass through a US standard sieve size #10 (2 mm opening). This composition is used to make cellulose ether derivatives.
    Type: Grant
    Filed: April 13, 2004
    Date of Patent: May 8, 2012
    Assignee: Hercules Incorporated
    Inventors: Paul C Gillette, Thomas G. Majewicz, Arjun C. Sau
  • Patent number: 8093376
    Abstract: The present invention relates to a process of preparing hydroxyalkyl cellulose derivatives having improved enzymatic resistance. In particular, the present invention relates to a process of preparing hydroxyalkyl cellulose derivatives by reacting cellulose and ethylene oxide in the presence of alkali metal hydroxide, wherein the reaction between cellulose and ethylene oxide is performed in the presence of isopropyl alcohol azeotropic solvent in a horizontally agitated reactor, wherein the ethylene oxide is supplied via two steps, thus resulting in a two-step reaction, and the amount of alkali metal hydroxide remaining after the first reaction is controlled, thereby enabling to provide hydroxyalkyl cellulose derivatives having improved enzymatic resistance and turbidity and to remarkably decrease the solvent usage to have economical and environmental advantages.
    Type: Grant
    Filed: December 17, 2004
    Date of Patent: January 10, 2012
    Assignee: Samsung Fine Chemicals Co., Ltd.
    Inventors: Seok Soo Kim, Jung Ho So, Il Yong Lee, Hee Won Hwang
  • Publication number: 20120004194
    Abstract: Novel aldehyde-functionalized polysaccharide compositions are described that are more stable in aqueous solution than oxidized polysaccharides or other types of polysaccharides containing pendant aldehyde groups. The aldehyde-functionalized polysaccharides may be reacted with various amine-containing polymers to form hydrogel tissue adhesives and sealants that may be useful for medical applications such as wound closure, supplementing or replacing sutures or staples in internal surgical procedures such as intestinal anastomosis and vascular anastomosis, tissue repair, preventing leakage of fluids such as blood, bile, gastrointestinal fluid and cerebrospinal fluid, ophthalmic procedures, drug delivery, and preventing post-surgical adhesions.
    Type: Application
    Filed: July 1, 2010
    Publication date: January 5, 2012
    Applicant: E. I. DU PONT NEMOURS AND COMPANY
    Inventors: Helen S.M. Lu, Steven W. Shuey
  • Patent number: 8053216
    Abstract: A new method to produce formulations of bacterial cellulose that exhibit improved viscosity-modifying properties particularly with low energy applied to effectuate viscosity changes therewith is provided. Such a method includes the novel co-precipitation with a water soluble co-agent that permits precipitation in the presence of excess alcohol to form an insoluble fiber that can than be utilized as a thickener or suspension aid without the need to introduce high energy mixing. Such bacterial cellulose properties have been available in the past but only through highly labor and energy intensive processes. Such an inventive method as now proposed thus provides a bacterial cellulose-containing formulation that exhibits not only properties that are as effective as those for previous bacterial celluloses, but, in some ways, improvements to such previous types. Certain end-use compositions and applications including these novel bacterial cellulose-containing formulations are also encompassed within this invention.
    Type: Grant
    Filed: May 23, 2005
    Date of Patent: November 8, 2011
    Assignee: CP Kelco U.S., Inc.
    Inventors: Zhi-Fa Yang, Neil A. Morrison, Todd A. Talashek, David F. Brinkmann, Don DiMasi, You Lung Chen
  • Publication number: 20110230655
    Abstract: A process is disclosed for regenerating or derivatizing cellulose. The process comprises the steps of providing a source of unrefined cellulose, and dissolving the unrefined cellulose in a molten inorganic salt. The source of unrefined cellulose may be a biomass, such as wood. The process permits the regeneration or derivatization of cellulose having a high degree of polymerization.
    Type: Application
    Filed: February 18, 2011
    Publication date: September 22, 2011
    Inventors: Jacob A. MOULIJN, Sjoerd Daamen, Paul O'Connor, Rob Van Der Meij
  • Patent number: 8017766
    Abstract: Provided is a method for preparing alkali cellulose having alkali distributed uniformly therein. A uniform alkali distribution in the alkali cellulose makes it possible to prepare cellulose ether which has been substituted uniformly in an etherification reaction step. The resulting cellulose ether does not contain a floating water-insoluble portion which will otherwise appear owing to insufficient substitution. More specifically, provided are a method for preparing alkali cellulose, comprising simultaneously feeding pulp powder and an aqueous alkali solution to a high speed disperser to continuously bring them into contact with each other and a method for preparing cellulose ether, comprising reacting the resulting alkali cellulose with an etherifying agent.
    Type: Grant
    Filed: June 7, 2006
    Date of Patent: September 13, 2011
    Assignee: Shin-Etsu Chemical Co., Ltd.
    Inventors: Mitsuo Narita, Atsushi Hatayama, Hiroshi Umezawa
  • Publication number: 20110113989
    Abstract: The present invention relates to the preparation of methylhydroxypropylcellulose (MHPC) and the use thereof in mineral-bound building material systems, preferably in gypsum-bound building material systems, particularly preferably in gypsum machine plaster.
    Type: Application
    Filed: March 15, 2008
    Publication date: May 19, 2011
    Inventors: Meinolf Brackhagen, Grit Grote, Martin Kowollik, Hartwig Schlesiger
  • Patent number: 7919614
    Abstract: Synthetic polysaccharides are disclosed containing 8-24 monosaccharide units made up of a concatenation of disaccharides consisting of a uronic acid and a hexose, wherein the hydroxyl groups of the polysaccharides are etherified with a C1-6 alkyl group or esterified in the form of a sulpho group, each disaccharide being at least monoetherified; and salts thereof, are disclosed.
    Type: Grant
    Filed: October 2, 2003
    Date of Patent: April 5, 2011
    Assignees: Sanofi-Aventis, Azko Nobel
    Inventors: Philippe Duchaussoy, Jean Marc Herbert, Guy Jaurand, Maurice Petitou, Constant Van Boeckel
  • Publication number: 20100311964
    Abstract: The present invention relates to a process for selectively producing a cellulose ether derivative with a very high reaction efficiency of an organohalide compound. There is provided a process for producing a cellulose ether derivative such as carboxymethyl cellulose and hydroxyethyl cellulose in which a low-crystalline powdery cellulose having a crystallinity of 50% or less is reacted with an organohalide compound such as ethylene chlorohydrin, a monohaloacetic acid and a salt of the monohaloacetic acid in the presence of a base.
    Type: Application
    Filed: November 11, 2008
    Publication date: December 9, 2010
    Applicant: KAO Corporation
    Inventors: Munehisa Okutsu, Takeshi Ihara
  • Patent number: 7838667
    Abstract: A method of grafting galactomannan-type polysaccharide polymers, preferably guar, to a functional group by irradiation with high energy electron beams in the presence of an unsaturated monomer-compressing the described functional group. The method may include the depolymerization of the grafted polymer to a pre-selected low molecular weight. The preferred galactomannans for treatment according to this method are guar gum, guar splits and hydroxypropyl guar. In a preferred embodiment the guar gum is also depolymerized, preferably to a molecular weight of below about 700,000 Daltons, and most preferably to a molecular weight of between about 100,000 Daltons to about 250,000 Daltons. The depolymerized guar most preferably has a polydispersity of less than about 3.0 and is useful in oil well fracturing to enhance oil production.
    Type: Grant
    Filed: June 25, 2003
    Date of Patent: November 23, 2010
    Assignee: Rhodia, Inc.
    Inventors: Leo Zhaoqing Liu, Christian Priou
  • Publication number: 20100240776
    Abstract: A contact lens (4) comprises a solid component capable of imparting shape and structure to said lens, and a liquid component, at least partially contained in the solid component, capable of favouring the compatibility between said lens and the eye of a user of said lens, wherein the liquid component comprises a solution capable of being used as a lachrymal substitute.
    Type: Application
    Filed: February 8, 2010
    Publication date: September 23, 2010
    Inventor: Alessandro Filippo
  • Publication number: 20100168410
    Abstract: A composition for manufacture of hard hydroxypropyl methyl cellulose capsules comprising a film forming material of hydroxypropyl methyl cellulose having a methoxy content of 27.0-30.0% (w/w), and a hydroxypropoxy content of 4.0-7.5% and as a 2% weight solution, a viscosity of 3.5-6.0 cPs at 20° C., dipping compositions, process for manufacture of hard hydroxypropyl methyl cellulose capsules according to a dip coating process and hard capsule shells.
    Type: Application
    Filed: October 17, 2007
    Publication date: July 1, 2010
    Applicant: PFIZER PRODUCTS INC.
    Inventors: Dominique Nicolas Cade, David He Xinwe
  • Publication number: 20100120658
    Abstract: A textile care agent comprising amine-modified cellulose ether for protecting textiles, and the use of the agent for improving water absorption, for improving shape retention, for lint reduction, for reducing pilling, for reducing wrinkling, for smoothing and improving softness to the touch, and for making ironing easier for textile web materials.
    Type: Application
    Filed: January 19, 2010
    Publication date: May 13, 2010
    Applicant: Henkel AG & Co. KGaA
    Inventors: Marc-Steffen Schiedel, Noelle Wrubbel, Nadine Warkotsch, Doris Dahlmann
  • Publication number: 20090326217
    Abstract: The invention relates to a process for preparing a cellulose ether wherein the cellulose ether is prepared in the presence of an ether of the formula R1-O—R2 having a boiling point between 40 and 90° C., or of a solvent mixture comprising an ether and having a boiling point between 40 and 90° C., wherein R1 and R2 maybe the same or different and are independently selected from an alkyl group.
    Type: Application
    Filed: January 18, 2008
    Publication date: December 31, 2009
    Applicant: Akzo Nobel N.V.
    Inventor: Björn Mikael Vidmark
  • Patent number: 7608687
    Abstract: A compound comprised of a hydrophilic polymer covalently yet reversibly linked to a amine-containing ligand through a dithiobenzyl linkage is described.
    Type: Grant
    Filed: September 19, 2007
    Date of Patent: October 27, 2009
    Assignee: Alza Corporation
    Inventor: Samuel Zalipsky
  • Patent number: 7592307
    Abstract: A conjugate comprised of a hydrophilic polymer covalently yet reversibly linked to a amine-, hydroxy- or carboxyl-containing ligand is described. The resulting conjugate is capable of releasing the parent amine, hydroxy, or carboxyl-containing compound via thiol-mediated cleavage. The system allows for delivery of various amino-, hydroxy-, or carboxy-containing drugs in the form of their thiolytically cleavable macromolecular conjugates.
    Type: Grant
    Filed: June 6, 2007
    Date of Patent: September 22, 2009
    Assignee: Alza Corporation
    Inventors: Samuel Zalipsky, Radwan Kiwan