Hydroxyalkyl Containing Patents (Class 536/95)
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Patent number: 11608385Abstract: A method is provided for the post-treatment of nanoporous celluloses with an eye to scale up to plant operation wherein recycling and recovery of reagents is crucial in the efficient and cost effective operation of a full-scale plant. The instant method includes diminishing the alkali (e.g., sodium hydroxide) concentration of the treatment solution by converting it to a salt (e.g., a sodium salt).Type: GrantFiled: October 28, 2016Date of Patent: March 21, 2023Assignee: CELLULOSE SCIENCES INTERNATIONAL, INCInventors: Rajai H. Atalla, Rowan S. Atalla
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Patent number: 10723807Abstract: Provided is a method for producing a hydroxyalkyl alkyl cellulose having high thermal gel strength while suppressing a reduction in thermal gelation temperature. More specifically, provided is a method for producing a hydroxyalkyl alkyl cellulose including steps of: mixing cellulose pulp with a first alkali metal hydroxide solution to obtain alkali cellulose, reacting the alkali cellulose with an alkylating agent and a hydroxyalkylating agent to obtain a first reaction product mixture, adding a second alkali metal hydroxide solution to the first reaction product mixture without further adding any of alkylating and hydroxyalkylating agents to obtain a second reaction product mixture, and subjecting the second reaction product mixture to purification to obtain a hydroxyalkyl alkyl cellulose.Type: GrantFiled: March 14, 2018Date of Patent: July 28, 2020Assignee: SHIN-ETSU CHEMICAL CO., LTD.Inventors: Akira Kitamura, Mitsuo Narita
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Patent number: 10259990Abstract: A fracturing fluid and method of including a cellulose polymer derivative, a diol functional group, and a borate crosslinker. The diol functional group may be a cis-diol functional group, a 1,2-diol functional group, or a 1,3-diol functional group. The cellulose polymer derivative further may include a hydroxyethyl group or a hydroxypropyl group. The fracturing fluid may also include at least one metallic crosslinker. The method may also include the steps of adding a pH adjusting agent, at least one breaker, a surfactant, a scale inhibitor, and/or a bactericide to the fracturing fluid, or mixing the fracturing fluid using mixing equipment or wherein the fracturing fluid is introduced into a subterranean formation using one or more pumps.Type: GrantFiled: January 9, 2014Date of Patent: April 16, 2019Assignee: HALLIBURTON ENERGY SERVICES, INC.Inventors: Loan K. Vo, Bradley J. Sparks, Corneliu Stanciu, Christopher Parton
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Patent number: 9724309Abstract: The present invention provides a film-form preparation having a rapid dissolution profile in the mouth and sufficient film strength, and also having excellent appearance and feel. More specifically, the present invention provides a film-form preparation including: a water-soluble and a polar organic solvent-soluble edible polymer; and polar organic solvent-insoluble drug particles.Type: GrantFiled: March 28, 2011Date of Patent: August 8, 2017Assignee: NITTO DENKO CORPORATIONInventors: Daisuke Asari, Mitsuhiko Hori, Takuya Shishido
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Publication number: 20150144563Abstract: Articles containing soil adsorbing polymers, and more particularly, articles, for example nonwovens, such as paper towels, wovens, and/or sponges and/or article-forming components thereof that comprise a durably bonded soil adsorbing polymer, article-forming components used to make such articles, and processes for making same are provided.Type: ApplicationFiled: November 20, 2014Publication date: May 28, 2015Inventors: Robin Lynn McKIERNAN, Robert Joseph McCHAIN, Steven Daryl SMITH
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Patent number: 9040686Abstract: A coating agent containing a hydroxyalkyl cellulose in which a content of hydroxyalkoxy groups within the hydroxyalkyl cellulose is within a range of 40 to 50% by mass, preferably a coating agent containing a hydroxyalkyl cellulose in which the content of hydroxyalkoxy groups is within a range of 40 to 50% by mass and also a viscosity of 2% aqueous solution at 20° C. is within a range of 3.0 to 5.9 mPa·s; and a solid preparation coated with the coating agent.Type: GrantFiled: August 30, 2010Date of Patent: May 26, 2015Assignee: NIPPON SODA CO., LTD.Inventor: Yusuke Masue
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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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Publication number: 20150040798Abstract: Provided are a method for producing a water-soluble cellulose ether having a low degree of polymerization and enhanced whiteness, and the like. The method includes the steps of: bringing a pulp powder having a multiplication product of less than 0.004 mm2 which is obtained by multiplying a number-average fiber length by a number-average fiber width, each measured with a Kajaani fiber length analyzer, into contact with an alkali metal hydroxide to obtain an alkali cellulose; reacting the alkali cellulose with an etherifying agent to obtain a crude water-soluble cellulose ether having a high degree of polymerization; purifying the crude water-soluble cellulose ether; drying the purified water-soluble cellulose ether; grinding the dried water-soluble cellulose ether into a water-soluble cellulose ether powder; and depolymerizing the water-soluble cellulose ether powder to obtain the water-soluble cellulose ether having a low degree of polymerization.Type: ApplicationFiled: July 31, 2014Publication date: February 12, 2015Inventors: Akira Kitamura, Mitsuo Narita, Takuya Yokosawa, Yuichi Nishiyama
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Publication number: 20140369997Abstract: The present application describes a method of creating a foaming ophthalmic formulation. The described formulation includes the addition of a foaming agent. The resulting solution is designed to be distributed by a non-aerosol foaming bottle/or aerosol.Type: ApplicationFiled: February 2, 2012Publication date: December 18, 2014Applicant: PASEInventor: Calvin Alexander Grant
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Patent number: 8829181Abstract: The present invention relates to a process for producing a cationic hydroxypropyl cellulose including the step of reacting a low-crystalline powdery cellulose with a cationizing agent represented by the following general formula (1) and/or a cationizing agent represented by the following general formula (2), and propylene oxide in the presence of water in an amount of from 10 to 60% by mass on the basis of the low-crystalline powdery cellulose, and a catalyst: wherein R1 to R3 are each independently a linear or branched hydrocarbon group having 1 to 4 carbon atoms; and X and Z are each a halogen atom and may be the same or different from each other.Type: GrantFiled: October 29, 2010Date of Patent: September 9, 2014Assignee: KAO CorporationInventors: Masanori Takai, Masafumi Miyamoto, Kohei Nakanishi, Toru Nishioka
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Patent number: 8822675Abstract: Provided is nonionic and excellently stable low-substituted hydroxypropylcellulose having improved compressibility and flowability, and further having improved disintegration and texture in oral cavity. More specifically provided is low-substituted hydroxypropylcellulose having a crystallinity of 60% or less, a degree of hydroxypropoxyl substitution of 5 to 9% by weight, and an aspect ratio of less than 2.5, wherein the crystallinity is calculated based on a diffraction intensity by wide-angle X-ray diffraction measurement according to the following formula (1): Crystallinity(%)={(Ic?Ia)/Ic}×100??(1) wherein Ic means a diffraction intensity at a diffraction angle 2? of 22.5° and Ia means a diffraction intensity at a diffraction angle 2? of 18.5°.Type: GrantFiled: March 8, 2011Date of Patent: September 2, 2014Assignee: Shin-Etsu Chemical Co., Ltd.Inventors: Naosuke Maruyama, Yasuyuki Hirama
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Publication number: 20140186427Abstract: The present invention pertains to oral applicable therapeutic dosage forms, in particular to orodispersible films. The present invention especially is directed to orodispersible films comprising a base layer substantially free of therapeutically active agents and a top layer comprising the desired therapeutically active agents. The present invention also concerns suitable base layers for such orodispersible films as well as therapeutical uses thereof and methods for manufacturing them.Type: ApplicationFiled: August 13, 2012Publication date: July 3, 2014Applicant: TESA LABTEC GMBHInventors: Armin Breitenbach, Sebastian Braun, Ralf Schliephacke
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Publication number: 20140142293Abstract: Provided is a method for producing low-substituted hydroxypropyl cellulose with less yellowing. More specifically, the method for producing purified low-substituted hydroxypropyl cellulose includes the steps of: reacting alkali cellulose and an etherifying agent to obtain a reaction mixture; dispersing the reaction mixture in water containing a portion of acetic acid necessary for neutralizing the total amount of the reaction mixture to neutralize a portion of the reaction mixture, and then completely neutralizing with the remaining acetic acid to cause precipitation, to obtain a slurry containing crude low-substituted hydroxypropyl cellulose; disintegrating a solid component in the slurry through a cutter pump, the solid component containing the crude low-substituted hydroxypropyl cellulose, and discharging the slurry containing the disintegrated solid component; washing the discharged slurry with water to obtain a cake of purified low-substituted hydroxypropyl cellulose; and drying the cake.Type: ApplicationFiled: November 14, 2013Publication date: May 22, 2014Applicant: Shin-Etsu Chemical Co., Ltd.Inventors: Akira Kitamura, Atsuhiko Yonemochi, Mitsuo Narita
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Publication number: 20140134317Abstract: Cellulose ethers are described herein which are useful in food compositions. In these cellulose ethers the ether substituents are methyl groups, hydroxyalkyl groups, and optionally alkyl groups being different from methyl, the cellulose ether has a DS(methyl) of from 1.65 to 2.20, an MS(hydroxyalkyl) of from 0.10 to 1.00, and hydroxy groups of anhydroglucose units are substituted with methyl groups such that [s23/s26?0.2*MS(hydroxyalkyl)] is 0.35 or less, wherein s23 is the molar fraction of anhydroglucose units wherein only the two hydroxy groups in the 2- and 3-positions of the anhydroglucose unit are substituted with methyl groups and wherein s26 is the molar fraction of anhydroglucose units wherein only the two hydroxy groups in the 2- and 6-positions of the anhydroglucose unit are substituted with methyl groups.Type: ApplicationFiled: June 6, 2012Publication date: May 15, 2014Applicant: Dow Global Technologies LLCInventors: Britta Huebner-Keese, Carol E. Mohler, Meinolf Brackhagen, Roland Adden, Robert L. Sammler, Jonathan D. Moore, Matthias Knarr
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Patent number: 8709390Abstract: This invention relates to non-uniformly substituted (“blocky”) hydroxyethylcelluloses (HECs) and derivatives thereof that exhibit associative behavior in both neat solutions and in filled systems. The HECs and derivatives thereof exhibit unique and highly desirable rheology and are more efficient in thickening aqueous systems than prior art HEC products. These blocky HECs can be distinguished from prior art and commercial HEC products by having an unsubstituted anhydroglucose trimer ratio (U3R) greater than 0.21 and the hydroxyethyl molar substitution greater than about 1.3 and less than about 5. This invention also relates to processes for making blocky HEC and uses thereof in functional systems.Type: GrantFiled: February 14, 2006Date of Patent: April 29, 2014Assignee: Hercules IncorporatedInventors: Petrus Wilhelmus Franciscus Arisz, Kate M. Lusvardi, Tuyen T. Nguyen
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Publication number: 20140100292Abstract: The present invention relates inter alia to the use of moisture-conditioned disintegrants or expanding agents in tablet manufacture for the selective adjustment of the mechanical properties, the dissolution kinetics (dissolution) and/or the water loading of tablets.Type: ApplicationFiled: October 8, 2013Publication date: April 10, 2014Applicant: BOEHRINGER INGELHEIM INTERNATIONAL GMBHInventors: Eduard BALTHES, Johannes GESER, Peter SCHNEIDER
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Publication number: 20140073777Abstract: 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 (I) is treated by a pulverizing machine thereby obtaining a cellulose-containing raw material (II) which contains a cellulose having crystallinity in the range of 10 to 55% and Step 2 wherein the cellulose-containing raw material (II) obtained in Step 1 is added by a basic compound with the amount thereof being in the range of 0.6 to 1.Type: ApplicationFiled: April 27, 2012Publication date: March 13, 2014Applicant: KAO CORPORATIONInventors: Eisuke Miyoshi, Yutaka Yoshida, Ryo Miyasato, Yoichiro Imori, Toru Nishioka
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Patent number: 8652252Abstract: A hydraulic composition comprising a water-soluble hydroxyalkyl alkyl cellulose, cement, aggregate, reinforcing fibers, and water is provided. The hydroxyalkyl alkyl cellulose has a degree of alkyl substitution of 1.2-1.7, the sum of the degree of alkyl substitution and the molar substitution of hydroxyalkyl is 1.5-2.0, and a proportion of glucose ring not substituted with alkyl and hydroxyalkyl groups per glucose ring unit is up to 10 mol %. The composition cures within a short time and is extrusion moldable even at elevated temperature.Type: GrantFiled: July 2, 2013Date of Patent: February 18, 2014Assignee: Shin-Etsu Chemical Co., Ltd.Inventors: Hidekazu Konishi, Rumiko Itoh, Tsutomu Yamakawa, Kazuhisa Hayakawa
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Publication number: 20130289055Abstract: A powder of cold-soluble polysaccharide and polyol, which is highly viscous in water and suitable for direct compression, and a method for preparing the powder and uses thereof are described, the powder being notably intended for preparing solid forms with controlled release of an active principle.Type: ApplicationFiled: November 2, 2011Publication date: October 31, 2013Applicant: ROQUETTE FRERESInventors: Baptiste Boit, Fabrice Buquet, Gregory Le Bihan, Philippe Lefevre
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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: 20130236512Abstract: Cellulose ethers are described herein which are useful in capsules or in coatings for dosage forms. In these cellulose ethers the ether substituents are methyl groups, hydroxyalkyl groups, and optionally alkyl groups being different from methyl, the cellulose ether has an MS (hydroxyalkyl) of 0.05 to 1.00, and hydroxy groups of anhydroglucose units are substituted with methyl groups such that [s23/s26?0.2*MS(hydroxyalkyl)] is 0.35 or less, wherein s23 is the molar fraction of anhydroglucose units wherein only the two hydroxy groups in the 2- and 3-positions of the anhydroglucose unit are substituted with methyl groups and wherein s26 is the molar fraction of anhydroglucose units wherein only the two hydroxy groups in the 2- and 6-positions of the anhydroglucose unit are substituted with methyl groups.Type: ApplicationFiled: October 6, 2011Publication date: September 12, 2013Applicant: DOW GLOBAL TECHNOLOGIES LLCInventors: Roland Adden, Meinolf Brackhagen, Matthias Knarr, Jin Zhao
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Patent number: 8519120Abstract: Provided are a low-substituted hydroxypropylcellulose powder having high compressibility, good flowability and excellent disintegration, and a method for producing the same. More specifically, provided is a method for producing a low-substituted hydroxypropylcellulose powder having a molar substitution number per anhydrous glucose unit of 0.05 to 1.0, which is insoluble in water and swollenable by absorbing water, comprising the steps of: adding an aqueous sodium hydroxide solution to powdered pulp in such a manner that weight ratio of sodium hydroxide with respect to anhydrous cellulose is 0.1 to 0.3 so as to produce alkali cellulose; etherifying the obtained alkali cellulose to obtain a crude product; neutralizing the sodium hydroxide contained in the obtained crude reaction product; washing the resultant; drying; and pulverizing using by compaction-grinding.Type: GrantFiled: August 1, 2007Date of Patent: August 27, 2013Assignee: Shin-Etsu Chemical Co., Ltd.Inventors: Naosuke Maruyama, Hiroshi Umezawa
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Publication number: 20120232167Abstract: Provided is a method of producing hydroxyalkylcellulose microparticles, the method including generating a pulse shock wave, and supplying a hydroxyalkylcellulose aqueous solution to the pulse shock wave generation region, thereby crushing and drying the hydroxyalkylcellulose aqueous solution. According to the production method, hydroxyalkylcellulose microparticles having a volume-average particle size of at least 0.1 ?m but less than 15 ?m are obtained. By mixing the hydroxyalkylcellulose microparticles with a principal agent and subjecting the resulting mixture to a tablet compression, a solid preparation having excellent tensile strength and disintegration properties can be obtained.Type: ApplicationFiled: November 24, 2010Publication date: September 13, 2012Applicants: Nippon Soda Co., Ltd.Inventors: Hirofumi Takeuchi, Satoru Abe, Takeshi Shimotori, Gentaro Nemoto
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Publication number: 20120214985Abstract: The present invention relates to a process for producing a cationic hydroxypropyl cellulose including the step of reacting a low-crystalline powdery cellulose with a cationizing agent represented by the following general formula (1) and/or a cationizing agent represented by the following general formula (2), and propylene oxide in the presence of water in an amount of from 10 to 60% by mass on the basis of the low-crystalline powdery cellulose, and a catalyst: wherein R1 to R3 are each independently a linear or branched hydrocarbon group having 1 to 4 carbon atoms; and X and Z are each a halogen atom and may be the same or different from each other.Type: ApplicationFiled: October 29, 2010Publication date: August 23, 2012Applicant: KAO CORPORATIONInventors: Masanori Takai, Masafumi Miyamoto, Kohei Nakanishi, Toru Nishioka
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Publication number: 20120214984Abstract: When a combination of pulps having different alkali metal hydroxide solution absorption rates is as a raw material, contact conditions such as a contact temperature and a contact time have to be changed frequently, depending on the absorption rate of pulps currently processed, thereby causing a problem of reduced productivity. For solving the problem, provided is a method for producing alkali cellulose, comprising at least the steps of: bringing two or more types of pulps having different alkali metal hydroxide solution absorption rates into contact with an alkali metal hydroxide solution to obtain a contact product; and draining the contact product, wherein the highest absorption rate is not more than 4.0 times as fast as the lowest absorption rate.Type: ApplicationFiled: February 16, 2012Publication date: August 23, 2012Applicant: SHIN-ETSU CHEMICAL CO., LTD.Inventor: Mitsuo Narita
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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: 20120157674Abstract: There are provided a coating agent containing a hydroxyalkyl cellulose in which a content of hydroxyalkyl groups within the hydroxyalkyl cellulose is within a range of 40 to 50% by mass, preferably a coating agent containing a hydroxyalkyl cellulose in which the content of hydroxyalkyl groups is within a range of 40 to 50% by mass and also a viscosity of 2% aqueous solution at 20° C. is within a range of 3.0 to 5.9 mPa·s; and a solid preparation coated with the coating agent.Type: ApplicationFiled: August 30, 2010Publication date: June 21, 2012Applicant: NIPPON SODA CO., LTD.Inventor: Yusuke Masue
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Publication number: 20120115823Abstract: Bismuth-containing compounds include bismuth and a biologically active agent coordinated to the bismuth. The biologically active agent includes at least one heteroatom configured for coordination with the bismuth. Coordination polymers include a polymer matrix that contains a bismuth-containing compound. Methods for modulating a pharmacokinetic property of a biologically active agent include coordinating the biologically active agent to bismuth to form a bismuth-containing compound, and administering the bismuth-containing compound orally to a patient. Methods for treating Parkinson's disease, methods for treating hypothyroidism, methods for treating ulcerative colitis, and methods for treating cancer each include administering a bismuth-containing compound to a patient.Type: ApplicationFiled: November 8, 2010Publication date: May 10, 2012Inventors: John D. Price, Thomas Piccariello, Robert A. Oberlender, Michaela E. Mulhare, Scott B. Palmer
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Publication number: 20120076708Abstract: A porous article of manufacture (a sealing material) which comprises sintered hydroxyalkylcellulose, for example, sintered hydroxypropylcellulose, or a sealing material which is capable of being formed into a porous article in the form of a filter and which is made by heating at least one gelling agent that has carboxyl functionality and at least one gelling agent that has hydroxyl functionality, preferably carboxylmethylcellulose (CMC) and hydroxypropylcellulose (HPC) respectively, and a method for preparing the same from a powdery admixture thereof, and a pipette which includes the sealing material in the form of a filter, and also including embodiments of a bilayer filter and of a trilayer filter, each of which comprises a composite of a filter of the present invention and a filter comprising porous sintered polyethylene, preferably ultra high-molecular weight polyethylene.Type: ApplicationFiled: September 19, 2011Publication date: March 29, 2012Applicant: GENERAL POLYMERIC CORPORATIONInventors: Joseph E. Ferri, Kenneth P. Kreska
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Patent number: 8138331Abstract: 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: GrantFiled: November 1, 2006Date of Patent: March 20, 2012Assignee: Dow Global Technologies LLCInventors: Meinolf Brackhagen, Hartwig Schlesiger
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Publication number: 20120065390Abstract: Provided is a method for producing low-substituted hydroxypropylcellulose in which depolymerization capable of achieving a target viscosity in a short time is carried out safely after an etherification reaction step. More specifically, provided is a method for producing low-substituted hydroxypropylcellulose having a degree of hydroxypropoxy substitution of from 9.5 to 16.0% by weight, comprising at least a step of reacting alkali cellulose with an etherifying agent and a step of carrying out depolymerization after the reaction.Type: ApplicationFiled: September 13, 2011Publication date: March 15, 2012Applicant: SHIN-ETSU CHEMICAL CO., LTD.Inventors: Akira Kitamura, Takahiro Suzuki, Mitsuo Narita
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Patent number: 8133991Abstract: An allergen inactivating agent is provided which has no adverse effects on the human body and which does not cause problems such as color development.Type: GrantFiled: January 31, 2005Date of Patent: March 13, 2012Assignee: Kao CorporationInventors: Mami Nonomura, Kimihiko Hori, Hiroshi Nojiri, Hiroyuki Yanagida, Fumiko Okuda
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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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Patent number: 8093376Abstract: 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: GrantFiled: December 17, 2004Date of Patent: January 10, 2012Assignee: Samsung Fine Chemicals Co., Ltd.Inventors: Seok Soo Kim, Jung Ho So, Il Yong Lee, Hee Won Hwang
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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: 20110230656Abstract: Provided is nonionic and excellently stable low-substituted hydroxypropylcellulose having improved compressibility and flowability, and further having improved disintegration and texture in oral cavity. More specifically provided is low-substituted hydroxypropylcellulose having a crystallinity of 60% or less, a degree of hydroxypropoxyl substitution of 5 to 9% by weight, and an aspect ratio of less than 2.5, wherein the crystallinity is calculated based on a diffraction intensity by wide-angle X-ray diffraction measurement according to the following formula (1): Crystallinity(%)={(Ic?Ia)/Ic}×100??(1) wherein Ic means a diffraction intensity at a diffraction angle 2? of 22.5° and Ia means a diffraction intensity at a diffraction angle 2? of 18.5°.Type: ApplicationFiled: March 8, 2011Publication date: September 22, 2011Inventors: Naosuke Maruyama, Yasuyuki Hirama
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Patent number: 8022136Abstract: By using a vulcanized rubber composition containing a rubber component composed of at least any one of a natural rubber, a modified natural rubber and a synthetic rubber, and chemically modified microfibril cellulose, it is possible to provide a vulcanized rubber composition that is environmentally conscious and that exhibits excellent rupture characteristics and a low energy loss, and a pneumatic tire that is excellent in rolling resistance property, steering stability and durability.Type: GrantFiled: September 4, 2008Date of Patent: September 20, 2011Assignee: Sumitomo Rubber Industries, Ltd.Inventors: Hiroyuki Yano, Yukio Isobe, Naoya Ichikawa, Takayuki Hattori
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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: 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: 20110003936Abstract: Disclosed are soil additives capable of hydrophilizing soil particles and/or increase available water capacity in soil. The soil additive are capable of increasing the available water content/capacity (AWC) in soils, the additive in one embodiment comprising a polymer composition having a hydrophilic portion and a hydrophobic portion, wherein the hydrophobic portion of the copolymer binds with the soil particle surface and the hydrophilic portion of the copolymer can bind with water. This results in the prevention, arrest or decelerated loss of water from the targeted area, for example the plant root zone, which allows for improved water usage efficiency by plants, grasses, vegetation, etc.Type: ApplicationFiled: July 2, 2010Publication date: January 6, 2011Applicant: Rhodia OperationsInventors: Zhiyun Chen, Jean-Christophe Castaing, Marie-Pierre Labeau
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Publication number: 20080262216Abstract: Provided is hydroxyalkyl methylcellulose which can be dissolved at room temperature of 20 to 30° C. and has high thermoreversible gel strength during thermoreversible gelation. More specifically, provided is water-soluble hydroxyalkyl methylcellulose having a molar substitution of hydroxyalkoxyl groups of 0.05 to 0.1 and a substitution degree of methoxyl groups of 1.6 to 1.9, wherein the hydroxyalkoxyl groups are classified into substituted hydroxyalkoxyl groups having hydroxyl groups of hydroxyalkoxyl groups substituted further with methoxyl groups and unsubstituted hydroxyalkoxyl groups having hydroxyl groups of hydroxyalkoxyl groups not further substituted; and a ratio (A/B) of a molar fraction (A) of the substituted hydroxyalkoxyl groups to a molar fraction (B) of unsubstituted hydroxyalkoxyl groups is 0.4 or greater.Type: ApplicationFiled: April 4, 2008Publication date: October 23, 2008Applicant: SHIN-ETSU CHEMICAL CO., LTD.Inventors: Kazuhisa HAYAKAWA, Rumiko ITOH
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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: 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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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: 7049436Abstract: 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: GrantFiled: October 9, 2002Date of Patent: May 23, 2006Assignee: BJ Services CompanyInventors: D. V. Satyanarayana Gupta, Greg Niechwiadowicz, Anita C Jerat
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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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Cellulose derivatives having gel-like rheological properties and process for the preparation thereof
Patent number: 6958393Abstract: 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: GrantFiled: July 23, 2003Date of Patent: October 25, 2005Assignee: Wolff Cellulosics GmbH & Co. KGInventors: Hartwig Schlesiger, Arne Henning Kull, Erik-Andreas Klohr -
Patent number: 6924369Abstract: 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 as protective colloids in polymerizations.Type: GrantFiled: June 25, 2002Date of Patent: August 2, 2005Assignee: SE Tylose GmbH & Co., KGInventors: Reinhard Doenges, Horst Wurm
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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