Mixed Ethers Patents (Class 536/90)
  • Patent number: 10300005
    Abstract: Described are personal care compositions, comprising water, nonionic cellulose ethers having hydroxyethyl groups and being further substituted with one or more hydrophobic substituents, and at least one hair fixative polymer, moisturizer, conditioner, humectant, cationic conditioning polymer, antioxidant, anti-aging active, or sun care active.
    Type: Grant
    Filed: September 14, 2012
    Date of Patent: May 28, 2019
    Assignees: Union Carbide Chemicals & Plastics Technology LLC, Rohm and Haas Company
    Inventors: Miao Wang, Emmett M. Partain
  • Patent number: 10086014
    Abstract: The invention relates to a method for the preparation of a polymer hydrogel, comprising cross-linking a precursor comprising a hydrophilic polymer optionally in combination with a second hydrophilic polymer, using a polycarboxylic acid as the cross-linking agent. The invention further concerns the polymer hydrogel obtainable by the method of the invention and the use thereof in a number of different applications.
    Type: Grant
    Filed: June 17, 2016
    Date of Patent: October 2, 2018
    Assignee: GELESIS LLC
    Inventors: Alessandro Sannino, Luigi Ambrosio, Luigi Nicolais, Christian Demitri
  • Patent number: 9683124
    Abstract: Multifunctional coating films that can be applied in liquid form are provided for compressing, sealing, covering and preserving surfaces. The films include a composition of polysaccharide materials and/or homo- or heteroglycan water-soluble polysaccharide derivatives, polyol spacers, and crosslinkers with carbonyl or carboxylic function(s). As-applied, the composition is water-soluble and reactive, but after hardening it is capable of absorbing water or swelling, impermeable to water vapour, stable against water and UV and can be biologically degraded in a controlled manner. By reacting polysaccharide materials, polysaccharide derivatives and polyol spacers with cross linkers having carbonyl or carboxylic function(s), mechanically stable flexible films are obtained, which retain their mechanical properties up to a foreign material content of 80%.
    Type: Grant
    Filed: March 27, 2013
    Date of Patent: June 20, 2017
    Assignee: THUERINGISCHES INSTITUT FUER TEXTIL-UND KUNSTSTOFF-FORSCHUNG E.V.
    Inventors: Jens Schaller, Knut Stengel, Frank Meister, Sabine Riede
  • Patent number: 9144625
    Abstract: This invention relates to absorbent materials useful in the manufacture of absorbent articles, in particular dressings for the advanced wound care market. The absorbent materials of the present invention are sulfonated polysaccharides, particularly water-insoluble cellulose alkyl sulfonates in which the cellulose is substituted by one type of alkyl sulfonate group. The invention also provides a process for the manufacture of such materials. The preferred cellulose alkyl sulfonate described herein is cellulose ethyl sulfonate. Reinforcing fibers and/or antimicrobial agents are optionally applied to the cellulose alkyl sulfonate.
    Type: Grant
    Filed: November 27, 2009
    Date of Patent: September 29, 2015
    Assignee: SPECIALITY FIBRES AND MATERIALS LTD.
    Inventor: Stephen Law
  • Patent number: 9024011
    Abstract: The present technology provides processes for cross-linking cellulose ethers under mild conditions. The processes include exposing a substantially dry cellulose ether film to a polyisocyanate to provide a cross-linked cellulose ether film, wherein the substantially dry cellulose ether film comprises alkoxide groups on the cellulose. The resulting cellulose ether films are highly cross-linked by polyurethane linkages and may be used as membranes in a variety of applications.
    Type: Grant
    Filed: September 2, 2010
    Date of Patent: May 5, 2015
    Assignee: University of Calcutta
    Inventors: Patit Paban Kundu, Ratan Pal Singh
  • Patent number: 8709450
    Abstract: The invention is a cellulose derivative wherein some of the carboxyl groups of the cellulose derivative carboxymethylcellulose are replaced with —CO—NH—X—CO—Y—Z, and a hydrogel of the same. In the formula, X is a C1-10 divalent hydrocarbon group, Y is a divalent group derived from polyalkylene oxide having oxygen atoms at both ends, and Z is a C1-24 hydrocarbon group or —CO—R4, where R4 is a C1-23 hydrocarbon group. The hydrogel has excellent viscoelasticity and can be injected into prescribed sites with injecting devices such as syringes, and it can thus be utilized as a medical gel or adhesion barrier.
    Type: Grant
    Filed: December 17, 2008
    Date of Patent: April 29, 2014
    Assignee: Teijin Limited
    Inventors: Hiroaki Kaneko, Nobuyuki Endo, Masaya Ito
  • 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: 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: 20120146468
    Abstract: A cellulose derivative, contains A) a hydrocarbon group; B) a group containing an acyl group: —CO—RB and an ethyleneoxy group: —C2H4—O— (RB represents a hydrocarbon group); and C) an acyl group: —CO—RC (RC represents a hydrocarbon group). A method for preparing the cellulose derivative, a resin composition containing the cellulose derivative, a case for an electric and electronic device and a method for preparing a molded body are also provided.
    Type: Application
    Filed: August 11, 2010
    Publication date: June 14, 2012
    Applicant: FUJIFILM CORPORATION
    Inventors: Shigeki Uehira, Youichirou Takeshima
  • 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
  • Publication number: 20120108805
    Abstract: A cellulose resin composition for melt molding, containing a cellulose derivative having two or more kinds of aliphatic oxy groups having different carbon numbers (—OR) (wherein R represents an aliphatic group which may be unsubstituted or substituted), wherein a difference in carbon number between the aliphatic oxy group having the largest carbon number and the aliphatic oxy group having the smallest carbon number is 1 to 18. The cellulose resin composition can provide good thermoplasticity and excellent mechanical strength, and can be used to prepare a molded body and a case for electric and electronic devices.
    Type: Application
    Filed: June 25, 2010
    Publication date: May 3, 2012
    Applicant: FUJIFILM CORPORATION
    Inventor: Yutaka Nozoe
  • Patent number: 8138331
    Abstract: A description is given of glyoxal-treated polysaccharide derivatives which, to decrease the unbound glyoxal, are treated with an aqueous solution of one or more water-soluble aluminium salts, or one or more water-soluble borates, or a combination of one or more water-soluble aluminium salts and one or more water-soluble borates, and, if appropriate, with suitable buffer substances to set the pH, and then dried. A description is likewise given of a process for decreasing the content of unbound glyoxal in glyoxal-treated polysaccharide derivatives.
    Type: Grant
    Filed: November 1, 2006
    Date of Patent: March 20, 2012
    Assignee: Dow Global Technologies LLC
    Inventors: Meinolf Brackhagen, Hartwig Schlesiger
  • Publication number: 20110129505
    Abstract: The invention is a cellulose derivative wherein some of the carboxyl groups of the cellulose derivative carboxymethylcellulose are replaced with —CO—NH—X—CO—Y—Z, and a hydrogel of the same. In the formula, X is a C1-10 divalent hydrocarbon group, Y is a divalent group derived from polyalkylene oxide having oxygen atoms at both ends, and Z is a C1-24 hydrocarbon group or —CO—R4, where R4 is a C1-23 hydrocarbon group. The hydrogel has excellent viscoelasticity and can be injected into prescribed sites with injecting devices such as syringes, and it can thus be utilized as a medical gel or adhesion barrier.
    Type: Application
    Filed: December 17, 2008
    Publication date: June 2, 2011
    Applicant: TEIJIN LIMITED
    Inventors: Hiroaki Kaneko, Nobuyuki Endo, Masaya Ito
  • 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: 20080242852
    Abstract: The present invention relates to a method for preparing hydroxyalkylalkylcellulose with high yield, more particularly to a method for preparing hydroxyalkylalkylcellulose with high yield, with at least 60% of alkoxy and hydroxyalkoxy substituted, by treating finely ground pulp with an alkali metal hydroxide at room temperature, reacting it with an alkylene oxide and an alkyl halide, and then adding an alkali metal hydroxide and an alkyl halide thereto. The method of the present invention is highly economical and also environment-friendly because waste of the reactants can be greatly reduced.
    Type: Application
    Filed: December 30, 2005
    Publication date: October 2, 2008
    Inventors: Seok Soo Kim, Ung-Jin Kim, Il Yong Lee, Hee Won Hwang, Yong Sung Jang
  • Patent number: 7402668
    Abstract: A process of preparing alkylhydroxyalkylcellulose (e.g., methylhydroxyethylcellulose and methylhydroxypropylcellulose) by reaction of cellulose in the presence of alkali metal hydroxide with an alkylating agent and a hydroxyalkylating agent is described. The process includes: (a) alkalizing cellulose by means of 0.9 to 2.9 equivalents of an alkali metal hydroxide I/AGU of the cellulose in the form of an aqueous alkali metal hydroxide solution, in the presence of a suspension medium containing at least 0.2 equivalents of an alkylating agent I/AGU of the cellulose; (b) reacting the alkalized cellulose of step (a) with alkylating agent I and a hydroxyalkylating agent at a temperature above 65° C.
    Type: Grant
    Filed: July 17, 2002
    Date of Patent: July 22, 2008
    Assignee: Dow Wolff Cellulosics GmbH
    Inventors: Wolfgang Dannhorn, Erik-Andreas Klohr, Martin Kowollik, Hartwig Schlesiger, Jörn-Bernd Pannek
  • Patent number: 7049436
    Abstract: Alcohol based hydraulic fracturing fluids useful for treating oil and gas wells are disclosed. The fluids are compatible with carbon dioxide, and comprise an alcohol, a polymer, a crosslinking agent, and a breaker. Hydroxypropyl guar with a molar substitution of about 1.2 to about 2.2 is identified as a presently preferred polymer.
    Type: Grant
    Filed: October 9, 2002
    Date of Patent: May 23, 2006
    Assignee: BJ Services Company
    Inventors: D. V. Satyanarayana Gupta, Greg Niechwiadowicz, Anita C Jerat
  • Patent number: 7005515
    Abstract: The process for preparing an alkyl hydroxyalkyl cellulose ether comprises the steps of: a) alkalizing cellulose to obtain alkali cellulose, b) reacting alkali cellulose with an alkyl halogenide until an alkyl cellulose ether with a D.S.(alkyl) value of from 0.7 to 2.5. is attained, c) removing excess alkyl halogenide from the reaction mixture, and d) reacting the alkyl cellulose ether with an alkylene oxide in a liquid suspending agent to produce an alkyl hydroxyalkyl cellulose ether. An alkyl hydroxyalkyl cellulose ether is produced which has an D.S.(alkyl) of from 0.7 to 2.5 and an MS (hydroxyalkyl) from 0.03 to 2.0, wherein not more that 15 percent of the hydroxyalkyl groups are capped with an alkyl group.
    Type: Grant
    Filed: March 4, 2002
    Date of Patent: February 28, 2006
    Assignee: Dow Global Technologies Inc.
    Inventors: Hans P. Schneider, Wolfgang H. Beer, Stephen J. Merryweather
  • Patent number: 6958393
    Abstract: A description is given of cellulose derivatives having gel-like rheological properties in aqueous solution characterized in that: a) cellulose is alkalized with aqueous alkali metal hydroxide solution in the presence of a suspension medium, b) the alkalized cellulose is reacted with one or more alkylene oxides, c) then reacted with an alkyl halide present in the suspension medium d) subsequently or simultaneously the alkalized cellulose is reacted with a crosslinking agent in an amount of 0.0001 to 0.05 eq, where the unit “eq” represents the molar ratio of crosslinking agent relative to the anhydroglucose unit (AGU) of the cellulose used, and e) after, if appropriate, further addition of alkali metal hydroxide and/or alkylating agent, the resultant irreversibly crosslinked cellulose derivative is separated off from the reaction mixture, if appropriate purified and dried.
    Type: Grant
    Filed: July 23, 2003
    Date of Patent: October 25, 2005
    Assignee: Wolff Cellulosics GmbH & Co. KG
    Inventors: Hartwig Schlesiger, Arne Henning Kull, Erik-Andreas Klohr
  • Patent number: 6943247
    Abstract: Described is a building material composition prepared from or having added thereto a particulate material selected from particulate polysaccharides or particulate polysaccharide derivatives. The particulate material of the building material composition is prepared by a method comprising: (a) forming a feed composition comprising a member selected from the group consisting of polysaccharides and polysaccharide derivatives, and 35 wt. % to 99 wt. % of water, based on the total weight of the feed composition, wherein said member is at least one of swelled and dissolved in the feed composition; (b) contacting, in a mill, the feed composition with a gas stream, thereby converting simultaneously the water of said feed composition into water vapor, and said member of said feed composition into a solid state form of finely particulate material; (c) separating the particulate material from the gas stream; and (d) optionally drying the particulate material.
    Type: Grant
    Filed: March 14, 2001
    Date of Patent: September 13, 2005
    Assignee: Wolff Walsrode AG
    Inventors: René Kiesewetter, Hartwig Schlesiger, Martin Morning, Gunter Weber, Werner Lange
  • Patent number: 6939961
    Abstract: A process for preparing low-viscosity water-soluble cellulose ethers by the oxidative decomposition of higher-viscosity cellulose ethers with hydrogen peroxide is described. The process involves: (a) forming, under conditions of intensive mixing and at temperatures of 65-125° C., a mixture of, (i) one or more higher-viscosity cellulose ethers, and (ii) an aqueous solution of hydrogen peroxide, the proportions of the mixture being selected in such a way that the hydrogen peroxide content is 0.1-10 wt. % in relation to the dry cellulose ether, the solids content of the mixture is at least 25 wt. % in relation to the total weight of the mixture; and (b) agitating continuously the mixture of step (a) at temperatures of 65-125° C. until at least approximately 90% of the hydrogen peroxide has been spent.
    Type: Grant
    Filed: November 15, 1999
    Date of Patent: September 6, 2005
    Assignee: Wolf Walsrode AG
    Inventor: Hartwig Schlesiger
  • Patent number: 6933381
    Abstract: Process for the production of polysaccharide ethers, e.g. cellulose ethers, are disclosed wherein salts formed during the process, e.g., sodium nitrate or sodium acetate, are converted to their corresponding acids and bases by means of an electric current, preferably in combination with a bipolar membrane and suitable catiion and/or anion membranes. The acids and bases recovered from the process can be recycled, thereby avoiding the need to provide for disposal of salts.
    Type: Grant
    Filed: February 2, 2001
    Date of Patent: August 23, 2005
    Inventors: Charles B. Mallon, John S. Vames, John I. Sarlis, Benito See, David M. Trampe, Rathin Datta
  • Patent number: 6891034
    Abstract: Described is a process of preparing alkylhydroxyalkyl cellulose, e.g., methylhydroxypropyl cellulose (MHPC). The process includes: (a) alkylating cellulose with an aqueous caustic solution containing from 1.5 to 5.5 equivalents of alkali metal hydroxide, e.g., NaOH, per anhydroglucose unit (AGU) of said cellulose, in the presence of a suspension agent, e.g., dimethyl ether, which contains alkyl halide, e.g., methyl chloride, in an amount of from (equivalents of alkali metal hydroxide per AGU minus 1.4) to (equivalents of alkali metal hydroxide per AGU plus 0.8); (b) reacting the alkalised cellulose of step (a) with one or more alkylene oxides, e.g., propylene oxide, at a temperature higher than 65° C., e.g., 85° C.
    Type: Grant
    Filed: August 3, 2001
    Date of Patent: May 10, 2005
    Assignee: Wolff Walsrode AG
    Inventors: Wolfgang Dannhorn, Hartwig Schlesiger, Jörn-Bernd Pannek, Gerolf Weissach
  • Patent number: 6872820
    Abstract: Finely divided polysacharide derivatives are described. The finely divided polysacharide derivatives are prepared by a process comprising: a) forming an aqueous composition comprising a polysaccharide derivative and water, in which the polysaccharide derivative is soaked or dissolved; b) converting the polysaccharide derivative of the aqueous composition into finely divided solid particles by, (i) contacting the aqueous composition with superheated water vapor in a dryer-pulverizer; or (ii) causing the polysaccharide derivative of the aqueous composition to flocculate; and c) optionally drying the finely divided solid particles of step b). The primary structures of the polysaccharide starting material are largely removed, and the product has a shape factor of less than 5 and greater than or equal to 1.
    Type: Grant
    Filed: October 1, 2001
    Date of Patent: March 29, 2005
    Assignee: Wolff Walsrode AG
    Inventors: Gunter Weber, Detmar Redeker, Bernd Klinksiek, Jürgen Hinderer, Benno Ulfik
  • Patent number: 6843845
    Abstract: An admixture comprising (A) a nonionic water-soluble hydroxyethyl cellulose and/or hydroxyethyl ethyl cellulose having a viscosity of at least 500 mPa·s as measured in a 1 wt % aqueous solution at 20° C., and (B) another nonionic water-soluble cellulose ether having a viscosity of at least 1,500 mPa·s as measured in a 1 wt % aqueous solution at 20° C. is suited for use in extrudable hydraulic compositions, because the hydraulic compositions comprising the admixture are effectively extrudable into hardened products having improved surface properties, minimized spring-back and good dimensional accuracy.
    Type: Grant
    Filed: March 11, 2003
    Date of Patent: January 18, 2005
    Assignee: Shin-Etsu Chemical Co., Ltd.
    Inventors: Yoshiaki Sasage, Tsutomu Yamakawa
  • Patent number: 6669863
    Abstract: An anionic cellulose ether obtainable by a process comprising reacting an alkali metal cellulose with one or more reagents A selected from the group consisting of haloacetic acids, alkali metal haloacetates, alkali metal vinyl sulfonates, vinyl sulfonic acid, and precursors thereof, and one or more reagents B having the formula R1—(OCH2CH(R2))n-P, wherein R2 represents hydrogen or a methyl group; n is 0-2; P represents a glycidyl ether group, a 1,2-epoxy group or a precursor thereof, if P represents a glycidyl ether group, R1 represents a linear C3-C5 alkyl group, optionally containing an oxygen atom, a phenyl group, or a benzyl group, and if P represents a 1,2-epoxy group, R1 represents a linear C3-C5 alkyl group, optionally containing an oxygen atom. Preferably, reagent A is chloroacetic acid and reagent B is n-butyl glycidyl ether. The invention also relates to the use of said anionic cellulose ether as an associative thickener, rheology modifier or stabilizer.
    Type: Grant
    Filed: August 31, 2001
    Date of Patent: December 30, 2003
    Assignee: Akzo Nobel N.V.
    Inventors: Berend Jan Dijk, Jan Gerardus Batelaan
  • Patent number: 6627751
    Abstract: A hydrophobically modified anionic cellulose ether obtainable by a process comprising reacting an alkali metal cellulose with at least three alkylating reagents A, B, and C. Reagent A is selected from the group of haloacetic acids, alkali metal haloacetates, alkali metal vinyl sulfonates, and vinyl sulfonic acid. Reagent B has the formula R1—(OCH2CH(R2))n—P, wherein R1 represents a C2-C7 group, R2 is hydrogen or a methyl group, n is 0-2, and P represents a glycidyl ether group, a 3-halo-2-hydroxypropyl ether group, a 1,2-epoxy group, or a halide, and reagent C has the formula R3—(OCH2CH(R2))m—P, wherein R3 represents a C8-C30 group, m is 0-10, and R2 and P have the meaning as described above.
    Type: Grant
    Filed: December 6, 1999
    Date of Patent: September 30, 2003
    Assignee: Akko Nobel N.V.
    Inventors: Jan Gerardus Batelaan, Berend Jan Dijk, Peter Marten Van Der Horst
  • Patent number: 6602994
    Abstract: A method for producing derivatized microfibrillar polysaccharide, including but not limited to cellulose, derivatized by steric and/or electrostatic forces, where the electrostatic forces are provided by anionic charge or by a combination of both anionic and cationic charge, by stabilizing and/or microfibrillating a polysaccharide starting material. A method of modifying the rheological properties of a composition of matter using derivatized microfibrillar polysaccharide. Method of improving coatings, paper manufacture, and the stability of emulsions, dispersions, and foams using a derivatized microfibrillar polysaccharide. Compositions that include derivatized microfibrillar polysaccharide, including paper compositions, comestible compositions, non-comestible spreadable compositions, and emulsions, dispersion, and foams.
    Type: Grant
    Filed: February 10, 1999
    Date of Patent: August 5, 2003
    Assignee: Hercules Incorporated
    Inventors: Mary Jean Cash, Anita N. Chan, Herbert Thompson Conner, Patrick Joseph Cowan, Robert Alan Gelman, Kate Marritt Lusvardi, Samuel Anthony Thompson, Frank Peine Tise
  • Patent number: 6600033
    Abstract: The invention relates to a cellulose ether that is hydrophobically modified with an alkyl or alkenylketene dimer of general formula (I), in which R1 and R2 are alkyl or alkenyl chain, such as one having 5 to 22, preferably 13 to 20, most preferably 14 to 18 carbons. The product can be used in water-based products to control the rheological properties, for example. Objects of use include, for example, detergents, paper coating mixtures, paints, dispersing agents, and oil drilling muds.
    Type: Grant
    Filed: June 19, 2000
    Date of Patent: July 29, 2003
    Assignee: Metsa Specialty Chemicals Oy
    Inventors: Mikko Lähteenmäki, Heidi Känköhen, Göran Kloow, Oliver Ruppert, Jennifer Ann Leupin, Eugene Paul Gosselink
  • Patent number: 6593468
    Abstract: This invention relates to a process for producing a substantially fiber-free carboxymethyl cellulose which predominantly exhibits elastic properties, to the use thereof as a superabsorbent material, and to the use thereof as an adjuvant substance for achieving suitable rheological and water retention properties for the cosmetics, pharmaceutical and food sectors, and for industrial applications, e.g. as an additive for coating materials, for the sealing of cables and for use in tunnelling and in civil and underground engineering.
    Type: Grant
    Filed: April 17, 2000
    Date of Patent: July 15, 2003
    Assignee: Wolff-Walsrode AG
    Inventors: Werner Lange, Bernd Schriewer, Friedrich-Karl Lampert, Wilhelm Oppermann, Jörn-Bernd Pannek, René Kiesewetter
  • Patent number: 6562961
    Abstract: The invention relates to polysaccharide derivatives comprising a) at least one hydrophobic and b) at least one nitrogen-containing substituent; in particular, the derivative is a cellulose ether which, as substituent a), has a trialkylsilyl and, as substituent b), an aminoalkyl group. Furthermore, it relates to a process for immobilizing biomolecules on a coated sheet-like carrier material in which the biomolecules are attached at or in the coating and the coated sheet-like carrier material comprises within or outside the coating at least one such polysaccharide derivative. Additionally, in the process for preparing the mixed cellulose ether a solution of trialkylsilylcellulose in an organic solvent is admixed with a reactive aminoalkane derivative which is insoluble or only sparingly soluble in this solvent, the reaction is carried out and the end product is isolated.
    Type: Grant
    Filed: June 7, 2000
    Date of Patent: May 13, 2003
    Assignee: Molecular Machines & Industries GmbH
    Inventors: Stefan Seeger, Frank Loescher
  • Patent number: 6531593
    Abstract: Cellulose derivatives are formed by first crosslinking cellulose and subsequently reacting the crosslinked cellulose with a reagent capable of forming a cellulose ether or ester. Many crosslinking agents are suitable but those forming ether linkages between cellulose chains are preferred. The crosslinking, in effect, increases the D.P of the cellulose so that wood celluloses are then suitable for forming compositions that previously could only be formed very high D.P celluloses; e.g., those derived from cotton linters.
    Type: Grant
    Filed: May 16, 2000
    Date of Patent: March 11, 2003
    Assignee: Weyerhaeuser Company
    Inventors: Mengkui Luo, Richard A. Jewell, Amar N. Neogi
  • Patent number: 6509461
    Abstract: The present invention relates to a new, particularly economical process for producing particulate water-soluble cellulose derivatives. The process involves forming a feed composition of swollen and/or dissolved cellulose derivative, and water. The feed composition is contacted with a carrier and heat exchange gas, in a sieve-free high rotational speed gas jet impact mill, and the cellulose derivative of the feed composition is converted into a solid state form of finely particulate particles. The particulate cellulose derivative is then separated from the heat exchange gas and carrier gas, and optionally dried. The mill drying and the particulate cellulose derivative product are influenced by establishing a specific water content in the swollen and/or dissolved cellulose derivative.
    Type: Grant
    Filed: February 16, 2001
    Date of Patent: January 21, 2003
    Assignee: Wolff Walsrode AG
    Inventors: Hartwig Schlesiger, Martin Morning, Gunter Weber, René Kiesewetter, Rudolf Lelgemann
  • Publication number: 20020198373
    Abstract: The present invention is directed to particulate drug carriers, such as vesicles, formed from polysaccharide derivatives. A polysaccharide bearing at least one non-ionic hydrophilic group attached to an individual monosaccharide unit is hydrophobised to form a derivative bearing at least one long chain alkyl residue. Particle formation is then induced in the presence of cholesterol. The particles are suited for entrapment or conjugation of pharmaceutically active ingredients.
    Type: Application
    Filed: September 30, 1999
    Publication date: December 26, 2002
    Inventor: IJEOMA FLORENCE UCHEGBU
  • Patent number: 6372902
    Abstract: Polysaccharides, including hydroxyethyl cellulose, having alkyl-aryl hydrophobic substitution, provide latex compositions, such as paints, with improved rheology and stability. Improved processes for producing such polysaccharides are also provided.
    Type: Grant
    Filed: December 23, 1994
    Date of Patent: April 16, 2002
    Assignee: Union Carbide Corporation
    Inventors: Emmett Malone Partain, III, George Lewis Brode, II, Richard Charles Hoy
  • Patent number: 6372901
    Abstract: Polysaccharides, including hydroxyethyl cellulose, having alkyl-aryl hydrophobic substitution, provide latex compositions, such as paints, with improved rheology and stability. Improved processes for producing such polysaccharides are also provided.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: April 16, 2002
    Assignee: Union Carbide Corporation
    Inventors: Emmett Malone Partain, III, George Lewis Brode, II, Richard Charles Hoy
  • Patent number: 6320043
    Abstract: The invention relates to a new, particularly economic process for preparing pulverulent polysaccharide derivatives, in particular cellulose derivatives, having a thermal flocculation point; the process comprises soaking or dissolving the polysaccharide derivative in a solvent or mixed solvent, dividing/comminuting the soaked or dissolved polysaccharide derivative by thermal and/or mechanical liquid separation and an optional drying step.
    Type: Grant
    Filed: July 8, 1999
    Date of Patent: November 20, 2001
    Assignee: Wolf Walsrode AG
    Inventors: Gunter Weber, Detmar Redeker, Bernd Klinksiek, Jürgen Hinderer, Benno Ulfik
  • Patent number: 6313287
    Abstract: Water-soluble sulfoalkyl-containing hydrophobically modified cellulose ethers, processes for preparing them, and their use in emulsion paints The present invention relates to water-soluble ionic cellulose ethers from the group of the hydroxyalkylcelluloses which are substituted by on average from 0.001 to 1.0 alkyl group per anhydroglucose unit and which carry from 0.01 to 0.1 sulfoalkyl group per anhydroglucose unit, to processes for preparing them and to the use of water-soluble ionic cellulose ethers from the group of the hydroxyalkylcelluloses which are substituted by on average from 0.001 to 1.0 alkyl group per anhydroglucose unit and which carry from 0.01 to 0.4 sulfoalkyl group per anhydroglucose unit in emulsion paints.
    Type: Grant
    Filed: October 26, 1999
    Date of Patent: November 6, 2001
    Assignee: Clariant GmbH
    Inventors: Reinhard Doenges, Juergen Kirchner
  • Publication number: 20010021387
    Abstract: The present invention relates to water-soluble, organosilylated cellulose ethers in which the organosilyl groups are attached hydrolysis-stably to the cellulose ethers and the remaining substituents on the silicon atoms of the organosilyl groups are likewise stable to hydrolysis. The cellulose ethers of the invention exhibit a strongly thickening action in aqueous solution, even at very low degrees of silylation, and are suitable as thickeners, for example, in paints, adhesives, and cosmetics. They are further suitable as protective colloids in the preparation of polymer dispersions.
    Type: Application
    Filed: February 15, 2001
    Publication date: September 13, 2001
    Applicant: Clariant GmbH
    Inventors: Ralf Krammer, Reinhard Doenges, Juergen Kirchner, Horst Wurm
  • Patent number: 6261218
    Abstract: There is a process for making a cellulose ether. The process comprises the following: a) alkalyzing a cellulose pulp; b) etherifying the alkalyzed cellulose pulp to form a cellulose ether; c) washing the cellulose ether; d) drying the cellulose ether; e) milling the cellulose ether to a particulate form; f) heating the particulate cellulose ether; g) tumbling the particulate cellulose ether while simultaneously contacting it with an acid to partially depolymerize it to a lower molecular weight; h) partially or substantially neutralizing the acid. There is also an apparatus for making the cellulose ether.
    Type: Grant
    Filed: December 1, 1998
    Date of Patent: July 17, 2001
    Assignee: The Dow Chemical Company
    Inventor: Gary J. Schulz
  • Patent number: 6248880
    Abstract: The present invention relates to associative cellulose ethers with improved thickening effects, especially in paint. The improvement depends on the presence of a hydrophobic modifying group of the general formula where R is an aliphatic group of 12-22 carbon atoms and n is a number from 3 to 7. The DS of the hydrophobic group is 0.003 to 0.012.
    Type: Grant
    Filed: July 19, 1999
    Date of Patent: June 19, 2001
    Assignee: Akzo Nobel NV
    Inventor: Leif Karlson
  • Patent number: 6111011
    Abstract: Water-soluble, nonionic cellulose ethers selected from the group consisting of alkylcelluloses and hydroxyalkylcelluloses which are additionally substituted by butenyl groups are used as protective colloids in the preparation of aqueous polymer dispersions.
    Type: Grant
    Filed: November 19, 1998
    Date of Patent: August 29, 2000
    Assignee: Clariant GmbH
    Inventors: Reinhard Doenges, Rudolf Ehrler, Horst Wurm
  • Patent number: 6054511
    Abstract: Hydroxyethylcellulose (HEC), hydrophobically modified hydroxyethylcellulose (HMHEC), hydroxypropylcellulose (HPC), methylhydroxypropylcellulose (MHPC), carboxymethylhydroxyethylcellulose (CMHEC), guar, starch, xanthan, hydroxypropylguar (HP Guar) or carboxymethylhydroxypropylguar (CMHP Guar) are stepwise or continuously reacted with hydrogen peroxide to produce aqueous compositions with a solids content greater than 5% by weight at a viscosity at 25.degree. C. below 9500 mPa.s. It is preferred to use 30-50% hydrogen peroxide to depolymerize the polysaccharide.
    Type: Grant
    Filed: January 15, 1993
    Date of Patent: April 25, 2000
    Assignee: Aqualon Company
    Inventors: J David Angerer, Jashawant Jamanadas Modi, Robert C Szafranski
  • Patent number: 5898072
    Abstract: The invention concerns an aqueous suspension of a non-ionic, water-soluble cellulose ether cross-linked with glyoxal, in the presence of an electrolytic salt which gives a pH value below 8.0 in water and at the concentration involved. Conveniently, the suspension is produced by mixing the water included with a dry blend containing the cellulose ether and the electrolytic salt, and preferably the other components of the suspension as well.
    Type: Grant
    Filed: October 29, 1996
    Date of Patent: April 27, 1999
    Assignee: Akzo Nobel nv
    Inventors: Peter Bostrom, Lars Andersson
  • Patent number: 5837864
    Abstract: In a method of producing a suspension of a nonionic cellulose ether that has no turbidity point, the water forming part of the suspension is mixed with a dry mixture containing a cellulose ether, which is cross-linked with glyoxal, and an electrolyte salt. This electrolyte salt consists of a salt of a mixture of salts which, in water and at the concentration employed, results in a pH value below 8.0. Preferably, the cellulose ether is a hydroxyethylcellulose.
    Type: Grant
    Filed: June 10, 1997
    Date of Patent: November 17, 1998
    Assignee: Akzo Nobel NV
    Inventors: Lars Andersson, Peter Bostrom
  • Patent number: 5827835
    Abstract: Thermally gelling emulsion compositions which reversibly increase in either loss modulus or storage modulus, or both, upon contact with the eye, skin, mucous membrane or body cavity are disclosed. The emulsion compositions contain one or more nonionic substituted cellulose ethers and do not require a charged surfactant or a pH-sensitive polymer for such increase in loss modulus or storage modulus, or both, upon administration. In one embodiment, the compositions gel upon instillation in the eye.
    Type: Grant
    Filed: December 3, 1996
    Date of Patent: October 27, 1998
    Assignee: Alcon Laboratories, Inc.
    Inventor: Bhagwati P. Kabra
  • Patent number: 5814141
    Abstract: The invention relates to a liquid crystalline, photo cross-linkable main-chain polymer used as interferentially effective, chromophoric substance for colored paints, in which the main mesogenic groups are disposed at least approximately in a chiral-nematic manner. An etherified cellulose ether or a mixture of several etherified cellulose ethers is used pursuant to the invention as liquid crystalline main-chain polymer or polymers wherein:the cellulose ethers have a molecular weight of 500 to 1,000,000,the anhydroglucose units of the cellulose ethers are etherified with an average degree of molar substitution of 2 to 7 with propylene oxide or ethylene oxide units (C.sub.3 H.sub.6 O- or C.sub.2 H.sub.4 O-units), andthe cellulose ethers are etherified with an average degree of molar substitution of 1.5 to 3 with unsaturated hydrocarbon groups (C.sub.r H.sub.2r-1).
    Type: Grant
    Filed: November 27, 1996
    Date of Patent: September 29, 1998
    Assignee: Daimler-Benz AG
    Inventors: Martin Kirschbaum, Maria-Theresia Sailer, Fritz Dannenhauer, Hartmut Seliger
  • Patent number: 5808052
    Abstract: The present invention relates to water-soluble, particularly ternary, preferably ionic, cellulose mixed ethers, more particularly to anionic water-soluble cellulose mixed ethers, as additives for drilling fluid applications.
    Type: Grant
    Filed: June 10, 1996
    Date of Patent: September 15, 1998
    Assignee: Wolff Walsrode AG
    Inventors: Klaus Szablikowski, Werner Lange, Jorn-Bernd Pannek, Rene Kiesewetter
  • Patent number: 5804166
    Abstract: Disclosed are hair spray compositions containing non-ionic cellulosic ethers in a solvent base containing water and volatile organic solvent wherein the level of volatile organic solvent in the composition is about 80% or less, and wherein the non-ionic cellulose ether is characterized by a solution viscosity of less than about 50 cps at 25.degree. C. for an aqueous solution containing 3 wt. % solids and 55 wt. % ethanol. The preferred non-ionic cellulosic ether is methylhydroxypropyl cellulose.
    Type: Grant
    Filed: May 9, 1997
    Date of Patent: September 8, 1998
    Assignee: Hercules Incorporated
    Inventors: Anita N. Chan, Anthony B. Clayton, Jashawant J. Modi
  • Patent number: 5719274
    Abstract: Low molecular weight cellulose ethers which are suitable as a coating material for solid metered units and as an additive in ceramic compositions or cosmetics formulations or as a polymerization auxiliary are obtained by irradiation of a mixture of a higher molecular weight cellulose ether and a base with electrons.
    Type: Grant
    Filed: September 22, 1995
    Date of Patent: February 17, 1998
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Reinhard Doenges, Diethart Reichel