Alkyl Or Cycloalkyl Patents (Class 536/99)
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Patent number: 9024011Abstract: 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: GrantFiled: September 2, 2010Date of Patent: May 5, 2015Assignee: University of CalcuttaInventors: Patit Paban Kundu, Ratan Pal Singh
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Patent number: 8975310Abstract: A hydrophobic cationic steroidal anti-microbial (ceragenin) compound forms an amphiphilic compound having a hydrophobic sterol face and a hydrophilic cationic face. The hydrophobic CSA also includes a hydrophobic substituent that gives the ceragenin compound a CLogP value of at least 6.5.Type: GrantFiled: July 20, 2012Date of Patent: March 10, 2015Assignee: Brigham Young UniversityInventor: Paul B. Savage
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Publication number: 20140256832Abstract: The disclosure relates to a fullerene-derived cellulose nanocrystals, process for preparing same and methods of using said nanocrystals.Type: ApplicationFiled: March 6, 2014Publication date: September 11, 2014Applicant: CELLUFORCE INC.Inventors: Zhaoling Yao, Janelle Huimin Tam
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Publication number: 20140194618Abstract: Provided is a method for preparing a cellulose ether having a low degree of polymerization and undergoing less yellowing and a cellulose ether prepared thereby. Specifically, provided is a method for preparing a cellulose ether having a low degree of polymerization, the method including a step of bringing pulp and an alkali metal hydroxide solution into contact with each other or mixing them to obtain a corresponding alkali cellulose, a first depolymerization step of reacting the alkali cellulose with oxygen to adjust a viscosity reduction percentage of the alkali cellulose to from 10 to 95%, a step of reacting the depolymerized alkali cellulose with an etherifying agent, a step of washing and drying the reaction product to obtain a cellulose ether, and a second depolymerization step of bringing the cellulose ether into contact with hydrochloric acid to adjust a viscosity reduction percentage of the cellulose ether from 40 to 99.9%.Type: ApplicationFiled: January 9, 2014Publication date: July 10, 2014Applicant: Shin-Etsu Chemical Co., Ltd.Inventors: Mitsuo NARITA, Yuichi Nishiyama
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Publication number: 20130324710Abstract: There is disclosed a process for the derivatization of cellulose comprising the sequential steps: a) mixing cellulose with a viscosity below 900 ml/g with an aqueous solution to obtain a liquid, wherein particles comprising cellulose in said liquid have a diameter of maximum 200 nm, wherein the temperature of the aqueous solution is below 20° C., and wherein the pH of the aqueous solution is above 12, b) subjecting the liquid to at least one of the steps: i) decreasing the pH of the liquid with at least 1 pH unit, ii) increasing the temperature by at least 20° C., and c) derivatization of the cellulose. Advantages include that there is provided the possibility to derivatize cellulose faster and to a greater extent after the treatment. Further the yield is improved. The product quality is improved and the manufacture is cheaper and easier.Type: ApplicationFiled: October 26, 2011Publication date: December 5, 2013Applicant: HELI INOVATIO HANDELSBOLAGInventors: Gunnar Henriksson, Mikael Lindstrom
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Patent number: 8541571Abstract: 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: GrantFiled: February 25, 2009Date of Patent: September 24, 2013Assignee: SE Tylose GmbH & Co. KGInventors: Eugen Moellmann, Thomas Heinze, Tim Liebert, Sarah Koehler
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Publication number: 20130244976Abstract: The present invention provides a foam-type external skin preparation exhibiting an amount of and a retention of carbon dioxide foam appealing to the eye of the user, as well as good usability, such as in preventing the preparation from sagging from the skin, neither of which can be easily obtained with conventional foam-type external skin preparations. The present invention provides a foam-type external skin preparation containing a hydrophobically modified alkyl cellulose as an essential component.Type: ApplicationFiled: September 22, 2011Publication date: September 19, 2013Applicant: DAIDO CHEMICAL CORPORATIONInventors: Yasunari Inamoto, Toshio Shimamoto
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Patent number: 8440817Abstract: 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: GrantFiled: December 18, 2008Date of Patent: May 14, 2013Assignee: Kao CorporationInventor: Munehisa Okutsu
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Publication number: 20130053507Abstract: A hydrophobic cationic steroidal anti-microbial (ceragenin) compound forms an amphiphilic compound having a hydrophobic sterol face and a hydrophilic cationic face. The hydrophobic CSA also includes a hydrophobic substituent that gives the ceragenin compound a CLogP value of at least 6.5.Type: ApplicationFiled: July 20, 2012Publication date: February 28, 2013Inventor: Paul B. Savage
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Publication number: 20120277323Abstract: Disclosed are cellulose capsules, methods for preparing a cellulose capsule, and compositions comprising cellulose capsules, including sustained- or controlled-release dosage forms comprising cellulose capsules.Type: ApplicationFiled: November 8, 2010Publication date: November 1, 2012Applicant: UNIVERSITY OF IOWA RESEARCH FOUNDATIONInventors: Vijay Kumar, Bhavik Bhatt
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Publication number: 20120214983Abstract: Provided is a method for producing cellulose ether whose aqueous solution is transparent and contains a smaller amount of water-insoluble portion. The method comprises at least the steps of providing at least two alkali cellulose materials having different compositions, each of the materials having been prepared by bringing a pulp into contact with a solution of alkali metal hydroxide and draining; and mixing the at least two alkali cellulose materials having different compositions, wherein each weight ratio of the alkali metal hydroxide in each of the alkali cellulose materials having different compositions to a solid component in the pulp (alkali metal hydroxide/solid component in pulp) is equal to 0.4 to 2.5 times of a weight ratio of alkali metal hydroxide in the alkali cellulose obtained in the step of mixing to solid components in a sum of pulps used for preparation of the alkali cellulose materials.Type: ApplicationFiled: February 16, 2012Publication date: August 23, 2012Applicant: SHIN-ETSU CHEMICAL CO., LTD.Inventor: Mitsuo Narita
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Publication number: 20120041187Abstract: 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: ApplicationFiled: January 8, 2010Publication date: February 16, 2012Inventors: Matthias Sprehe, Bettina Hoelzer
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Publication number: 20110269711Abstract: The present invention provides a medicament or food supplement, that when ingested by an individual, forms a gel mass in the individual's stomach, said gel mass consisting essentially of methylcellulose and water, as well as methods for inducing satiety, reversibly reducing stomach void volume, and reducing caloric intake in an individual.Type: ApplicationFiled: April 27, 2011Publication date: November 3, 2011Inventors: Roland Adden, W. H. Anderson, Britta Huebner, Matthias Knarr
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Publication number: 20110230655Abstract: 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: ApplicationFiled: February 18, 2011Publication date: September 22, 2011Inventors: Jacob A. MOULIJN, Sjoerd Daamen, Paul O'Connor, Rob Van Der Meij
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Publication number: 20110182957Abstract: This invention relates to biomaterial compositions, methods and kits for producing hydrogels with tunable physico-chemical properties. Specifically, the invention relates to producing cellulosic hydrogels having optimized physico-chemical properties enabling support of cell growth or as replacement or filler for tissue repair, reconstruction or augmentation.Type: ApplicationFiled: June 19, 2009Publication date: July 28, 2011Inventors: Steven B. Nicoll, Simone S. Stalling, Anna T. Reza
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Patent number: 7985855Abstract: A method for modifying fibers is provided, which method comprises dispersing in water or a dilute alkali aqueous solution under shear a cellulose ether having such a low degree of substitution that a molar degree of substitution with an alkyl group and/or a hydoxyalkyl group ranges from 0.05 to 1.3, applying the resulting dispersion to fibers, and drying the applied fibers.Type: GrantFiled: June 29, 2005Date of Patent: July 26, 2011Assignee: Shin-Etsu Chemical Co., Ltd.Inventors: Naosuke Maruyama, Kazuhisa Hayakawa, Soji Tanioka
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Publication number: 20110150777Abstract: A medical magnetic resonance tomography apparatus and a contrast agent for magnetic resonance tomography imaging of cavities in a patient are provided. The contrast agent is formed from a highly viscous magnetic resonance contrast agent. The highly viscous magnetic resonance contrast agent includes a substance. A specific magnetic resonance contrast can be generated by the substance.Type: ApplicationFiled: December 15, 2010Publication date: June 23, 2011Inventor: Sebastian Schmidt
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Patent number: 7919614Abstract: 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: GrantFiled: October 2, 2003Date of Patent: April 5, 2011Assignees: Sanofi-Aventis, Azko NobelInventors: Philippe Duchaussoy, Jean Marc Herbert, Guy Jaurand, Maurice Petitou, Constant Van Boeckel
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Publication number: 20110046365Abstract: A transglycosylation product, a method of producing the same and use of the product. The transglycosylation product comprises an alkyl or hydroxyalkyl glycoside of a cellulose ester or ether, wherein the alkyl or hydroxyalkyl groups of the glycoside residue comprise a carbon chain having 1 to 4 carbon atoms, and having 0 to 2 free hydroxyl groups and being attached to the 1-carbon of the anhydroglucose unit via an oxy group. The product can be produced by mixing the cellulose derivative with mono-, di- or triol to form a reaction mixture, after which the reaction mixture is heated and the reaction is continued until a clear mixture is obtained. After cooling the recoverable product is suitable for use for example as an adhesive or as a hydrophobic coating.Type: ApplicationFiled: February 25, 2009Publication date: February 24, 2011Applicant: VALTION TEKNILLINEN TUTKIMUSKESKUSInventors: Hannu Mikkonen, Soili Peltonen, Aki Laine, Kyösti Valta, Eino Sivonen, Tero Malm, Juha Sarlin
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Publication number: 20100324280Abstract: The present invention provides a sodium absorption inhibitor, a potassium absorption inhibitor, and a phosphorus absorption inhibitor, and a preventive agent, a therapeutic agent and a food for diseases caused by overconsumption of common salt, potassium and phosphorus or diseases which require restriction of ingestion of common salt, potassium and phosphorus to actively and safely excrete overconsumed common salt, potassium and phosphorus excreted outside the body. R—O-A ??(I) {In the formula (I), R represents a crosslinked cellulose residue and A represents a functional group a having cation-exchange ability.Type: ApplicationFiled: December 26, 2007Publication date: December 23, 2010Applicant: OTSUKA Pharmaceutical Factory, Inc.Inventors: Ippei Yamaoka, Naoyuki Yoshida, Kazushi Ishida, Shuji Sasaki
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Publication number: 20100298555Abstract: 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: ApplicationFiled: December 18, 2008Publication date: November 25, 2010Applicant: KAO CORPORATIONInventor: Munehisa Okutsu
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Publication number: 20100274001Abstract: The present invention relates to a process for producing a cellulose ether derivative in an industrially convenient and efficient manner by reacting a low-crystalline powdery cellulose with an epoxy compound in the presence of a catalyst.Type: ApplicationFiled: October 21, 2008Publication date: October 28, 2010Applicant: Kao CorporationInventors: Munehisa Okutsu, Masanori Takai, Toru Nishioka, Takeshi Ihara, Naoki Nojiri, Masahiro Umehara, Kohei Nakanishi
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Publication number: 20090062524Abstract: The present invention describes a process for the degradation of cellulose by dissolving the cellulose in an ionic liquid and treating it with an acid, if appropriate with addition of water.Type: ApplicationFiled: February 28, 2007Publication date: March 5, 2009Applicant: BASF SEInventors: Klemens Massonne, Giovanni D'Andola, Veit Stegmann, Werner Mormann, Markus Wezstein, Wei Leng
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Patent number: 7402668Abstract: 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: GrantFiled: July 17, 2002Date of Patent: July 22, 2008Assignee: Dow Wolff Cellulosics GmbHInventors: Wolfgang Dannhorn, Erik-Andreas Klohr, Martin Kowollik, Hartwig Schlesiger, Jörn-Bernd Pannek
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Patent number: 7361753Abstract: The invention relates to a method for the production of at least alkylated, non-ionic cellulose ethers, whereby at least 10% of all hydroxy groups contained therein are alkylated and which may flocculate in water, within a temperature range of 45 to 95° C. The invention is characterized in that at least one surfactant in solid, liquid, or solution form is added to the cellulose for production of the cellulose ether.Type: GrantFiled: April 12, 2001Date of Patent: April 22, 2008Assignee: SE Tylose GmbH & Co. KGInventors: Alf Hammes, Reinhard Doenges
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Patent number: 7351422Abstract: Proposed is a novel soluble trauma-healing and hemostatic cellulose fiber capable of absorbing and readily dissolving hemorrhaging trauma loci when applied thereto and of promoting the hemostatic action of blood platelets and fibrin and cell adhesion to the trauma site. The coagulation protein-containing soluble trauma-healing and hemostatic cellulose fiber is produced in that after treatment of a natural or regenerated cellulose fiber with an aqueous sodium hydroxide solution, said fiber is carboxymethylated by reaction with a monochloro acetic acid solution for a given time (hours) in such a manner that the degree of partial substitution of the glucose units constituting the cellulose molecule (etherification degree) is 0.5-less than 1.0% and that, furthermore, the coagulation proteins fibrinogen, thrombin, and coagulation factor XIII are imparted by surface application or chemical bonding.Type: GrantFiled: February 22, 2001Date of Patent: April 1, 2008Assignee: Hogy Medical Co., Ltd.Inventors: Yoshio Jo, Motonori Aoshima, Koji Tanabe, Koichi Matsushita, Toshiki Inoue
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Publication number: 20080003443Abstract: A method for producing a cellulose acylate composition, which comprises filtering a solution in which cellulose acylate satisfying the following formulae 1 to 3 and having melt viscosity of 150 to 1000 Pa·s at 230° C. is dissolved in a solvent through a filter having a retention particle size of 0.1 to 40 ?m, and mixing the filtered solution with a poor solvent to reprecipitate cellulose acylate: 1.5?A+B?3Formula 1 0?A?2.0Formula 2 1.0?B?3Formula 3 where A is a substitution degree for an acetyl group of a hydrogen atom which constitutes a hydroxyl group of cellulose, and B is a substitution degree for an acyl group having 3 to 7 carbon atoms of a hydrogen atom which constitutes a hydroxyl group of cellulose.Type: ApplicationFiled: June 26, 2007Publication date: January 3, 2008Applicant: FUJIFILM CorporationInventor: Toyohisa Oya
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Patent number: 7247722Abstract: Polysaccharide aldehydes are prepared using selective oxidation involving the use of nitroxyl radical mediated aqueous oxidation with a limited amount of oxidant and defined reaction conditions. These polysaccharide aldehyde derivatives having maximum effective aldehyde and minimal carboxylic acid levels making them especially useful as wet, temporary wet and dry strength additives for paper.Type: GrantFiled: April 23, 2003Date of Patent: July 24, 2007Assignee: National Starch and Chemical Investment Holding CorporationInventors: A. Levent Cimedoglu, John S. Thomaides
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Patent number: 7208593Abstract: A process for producing a self-cross-linking alkyl cellulose derivative, which includes irradiating, with radioactive rays, a mixture of a starting alkyl cellulose derivative (the number of carbon atoms of the alkyl group is 1 through 3, the alkyl group may be substituted by a hydroxyl group or a carboxyl group, and the carboxyl group may form a salt) (100 parts by weight) and water (5–2,000 parts by weight), and thus obtained self-cross-linking alkyl cellulose derivative has an improved biodegradability and excellent water-absorbability.Type: GrantFiled: February 23, 2005Date of Patent: April 24, 2007Assignees: Daicel Chemical Industries, Ltd., Japan Atomic Energy Research InstituteInventors: Fumio Yoshii, Tamikazu Kume, Tadashi Murakami
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Patent number: 7005515Abstract: 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: GrantFiled: March 4, 2002Date of Patent: February 28, 2006Assignee: Dow Global Technologies Inc.Inventors: Hans P. Schneider, Wolfgang H. Beer, Stephen J. Merryweather
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Patent number: 6960660Abstract: A water-soluble cellulose ether is selected by judging whether the number of undissolved fibers having a size of 16–200 ?m is up to 350 fibers/2 ml in a 0.1 wt % aqueous solution of the cellulose ether at 25° C. This water-soluble cellulose ether forms an aqueous solution which can be filtered without clogging and can form a very thin film without defectives.Type: GrantFiled: June 19, 2003Date of Patent: November 1, 2005Assignee: Shin-Etsu Chemical Co., Ltd.Inventors: Shingo Niinobe, Kazuhisa Hayakawa
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Patent number: 6933381Abstract: 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: GrantFiled: February 2, 2001Date of Patent: August 23, 2005Inventors: Charles B. Mallon, John S. Vames, John I. Sarlis, Benito See, David M. Trampe, Rathin Datta
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Patent number: 6891034Abstract: 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: GrantFiled: August 3, 2001Date of Patent: May 10, 2005Assignee: Wolff Walsrode AGInventors: Wolfgang Dannhorn, Hartwig Schlesiger, Jörn-Bernd Pannek, Gerolf Weissach
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Patent number: 6849729Abstract: Provided is a cellulose polymer having a water retention property, and good feeling upon use when applied to the skin and being suitably used as a carrier. More specifically, provided is a low-substituted cellulose ether powder comprising primary particles wherein at least 95% by weight of the primary particles have an aspect ratio of 1.0 to 1.5. Also provided is a production process of a low-substituted cellulose ether powder having a molar substitution degree of 0.05 to 1.0, comprising, during or after the addition of an acid to an alkali solution of low-substituted cellulose ether to neutralize the solution, triturating a resulting mixture; and spray-drying a resulting dispersion. Further provided is a production process of a low-substituted cellulose ether powder having a molar substitution degree of 0.05 to 1.0, comprising shear-triturating a low-substituted cellulose ether powder in water so as to swell-disperse the powder and spray-drying a resulting dispersion.Type: GrantFiled: February 27, 2003Date of Patent: February 1, 2005Assignee: Shin-Etsu Chemical Co., Ltd.Inventor: Sakae Obara
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Patent number: 6843845Abstract: 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: GrantFiled: March 11, 2003Date of Patent: January 18, 2005Assignee: Shin-Etsu Chemical Co., Ltd.Inventors: Yoshiaki Sasage, Tsutomu Yamakawa
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Publication number: 20040110942Abstract: The invention relates to a method for the production of at least alkylated, non-ionic cellulose ethers, whereby at least 10% of all hydroxy groups contained therein are alkylated and which may flocculate in water, within a temperature range of 45 to 95° C. The invention is characterised in that at least one surfactant in solid, liquid or solution form is added to the cellulose for production of the cellulose ether.Type: ApplicationFiled: May 5, 2003Publication date: June 10, 2004Inventors: Alf Hammes, Reinhard Doengers
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Patent number: 6669863Abstract: 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: GrantFiled: August 31, 2001Date of Patent: December 30, 2003Assignee: Akzo Nobel N.V.Inventors: Berend Jan Dijk, Jan Gerardus Batelaan
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Publication number: 20030236398Abstract: A water-soluble cellulose ether is selected by judging whether the number of undissolved fibers having a size of 16-200 &mgr;m is up to 350 fibers/2 ml in a 0.1 wt % aqueous solution of the cellulose ether at 25° C. This water-soluble cellulose ether forms an aqueous solution which can be filtered without clogging and can form a very thin film without defectives.Type: ApplicationFiled: June 19, 2003Publication date: December 25, 2003Inventors: Shingo Niinobe, Kazuhisa Hayakawa
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Patent number: 6627751Abstract: 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: GrantFiled: December 6, 1999Date of Patent: September 30, 2003Assignee: Akko Nobel N.V.Inventors: Jan Gerardus Batelaan, Berend Jan Dijk, Peter Marten Van Der Horst
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Patent number: 6602994Abstract: 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: GrantFiled: February 10, 1999Date of Patent: August 5, 2003Assignee: Hercules IncorporatedInventors: Mary Jean Cash, Anita N. Chan, Herbert Thompson Conner, Patrick Joseph Cowan, Robert Alan Gelman, Kate Marritt Lusvardi, Samuel Anthony Thompson, Frank Peine Tise
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Patent number: 6600033Abstract: 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: GrantFiled: June 19, 2000Date of Patent: July 29, 2003Assignee: Metsa Specialty Chemicals OyInventors: Mikko Lähteenmäki, Heidi Känköhen, Göran Kloow, Oliver Ruppert, Jennifer Ann Leupin, Eugene Paul Gosselink
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Patent number: 6593468Abstract: 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: GrantFiled: April 17, 2000Date of Patent: July 15, 2003Assignee: Wolff-Walsrode AGInventors: Werner Lange, Bernd Schriewer, Friedrich-Karl Lampert, Wilhelm Oppermann, Jörn-Bernd Pannek, René Kiesewetter
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Patent number: 6562961Abstract: 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: GrantFiled: June 7, 2000Date of Patent: May 13, 2003Assignee: Molecular Machines & Industries GmbHInventors: Stefan Seeger, Frank Loescher
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Patent number: 6482876Abstract: The invention relates to an agglomerate containing at least one of the following water-soluble or water-dispersible materials as a bonding base polymer: carboxylized and/or alkoxylized starch, cellulose ether and fully synthetic vinyl polymers and/or polyacrylates. The agglomerate is characterized in that it contains a blasting agent which produces a high swelling pressure, but, advantageously, does not gel. The agglomerate can have a regular geometric form or not. Its weight should be between 0.5 and 500 g. The agglomerate is used in particular in the production of lump-free paste.Type: GrantFiled: March 15, 2000Date of Patent: November 19, 2002Assignee: Henkel Kommanditgesellschaft auf AktienInventors: Sandra Witt-Nuesslein, Werner Haller, Bernhard Schoettmer, Monika Boecker, Wolfgang Seiter, Ingo Hardacker, Heinz-Peter Hoffmann
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Patent number: 6392035Abstract: The invention concerns reactive cellulose, i.e. cellulose having in particular a very low degree of crystallinity obtainable with a high degree of purity. Said novel reactive cellulose is particularly used as raw material for making cellulose ethers. The invention is characterized in that the reactive cellulose is substituted by organic groups according to a degree of substitution, DS, of less than 0.2, preferably between 0.04 and 0.2.Type: GrantFiled: November 10, 1999Date of Patent: May 21, 2002Assignee: Rhodia AcetowInventors: Ties Karstens, Armin Stein, Hans Steinmeier
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Patent number: 6320043Abstract: 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: GrantFiled: July 8, 1999Date of Patent: November 20, 2001Assignee: Wolf Walsrode AGInventors: Gunter Weber, Detmar Redeker, Bernd Klinksiek, Jürgen Hinderer, Benno Ulfik
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Patent number: 6261218Abstract: 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: GrantFiled: December 1, 1998Date of Patent: July 17, 2001Assignee: The Dow Chemical CompanyInventor: Gary J. Schulz
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Patent number: 6235893Abstract: According to the present invention, there is a methylcellulose having a methoxy substitution of about 21 to about 42 percent based upon the weight of the cellulose ether and elastic modulus (EM) of EM≧181.3×(v0.2711) wherein “v” is viscosity of a two percent solution of the cellulose ether at 20° C. Further described is a process for making the cellulose ether, a food composition containing it, and a pharmaceutical capsule containing it.Type: GrantFiled: April 1, 1999Date of Patent: May 22, 2001Assignee: The Dow Chemical CompanyInventors: Kenneth C. Reibert, Jerry R. Conklin
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Patent number: 5898072Abstract: 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: GrantFiled: October 29, 1996Date of Patent: April 27, 1999Assignee: Akzo Nobel nvInventors: Peter Bostrom, Lars Andersson
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Patent number: 5837864Abstract: 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: GrantFiled: June 10, 1997Date of Patent: November 17, 1998Assignee: Akzo Nobel NVInventors: Lars Andersson, Peter Bostrom