Liquid Interaction Properties Changed (e.g., Solubility, Absorbability, Etc.) Patents (Class 536/87)
  • Patent number: 10150704
    Abstract: The present invention provides cementitious tile adhesives comprising ordinary Portland cement, sand or another inorganic filler, and from 0.12 to 0.6 wt. % of total solids of one or more polyether group containing crosslinked cellulose ethers. The present invention also provides methods of making the polyether group containing crosslinked cellulose ethers comprising crosslinking a cellulose ether at 90° C. or less, in an inert atmosphere, e.g. nitrogen, in the presence of a polyether group containing crosslinking agent and in the presence of alkali; the process may comprise part of a stepwise addition process of making of a cellulose ether itself in which the crosslinking of the cellulose ethers precedes at least one addition of alkyl halide or alkylene oxide to form, respectively, alkyl or hydroxyalkyl groups on the cellulose.
    Type: Grant
    Filed: June 29, 2016
    Date of Patent: December 11, 2018
    Assignee: Dow Global Technologies LLC
    Inventors: Alexandra Hild, Joerg Neubauer, Joern Breckwoldt
  • Publication number: 20150144032
    Abstract: Disclosed are methods for the preparation of alkyl hydroxyalkyl cellulose ethers, and the use of such alkyl hydroxyalkyl cellulose ethers in the preparation and use of mortars and other cement-based systems; also disclosed is a hydraulic composition containing at least one retarder, at least one accelerator and a cellulose ether having a prolonged open time without deterioration of the other cement tile adhesive properties such as workability, setting time, strength development and sag resistance; and further disclosed are dry mortars containing encapsulated calcium chloride used in preparing mortar materials for use in construction, and the preparation and use of such mortars in cold weather environments is also disclosed.
    Type: Application
    Filed: July 23, 2014
    Publication date: May 28, 2015
    Inventors: Kelly A. Brush, Patrick J. Cowan, Wilfried Adolphe Hohn, Alexander Adolphe Kindler, Vera Louise Nilles
  • Patent number: 8371475
    Abstract: Superabsorbents are metered by a process using a screw conveyor, wherein the superabsorbent is selected, or treated with a cohesion control agent, to have an unconfined yield strength of from 0.75 to 1.5 kPa at consolidation stress of 6 kPa.
    Type: Grant
    Filed: September 12, 2008
    Date of Patent: February 12, 2013
    Assignee: BASF SE
    Inventors: Norbert Herfert, Herman Josef Feise, Hanno Rüdiger Wolf
  • Patent number: 8175815
    Abstract: The invention deals with a method for the assessment of the effect of excipients, pH and combinations thereof on the predicted absorption properties of low solubility compounds, comprising the step of assessing a change in a flux function for a combination of a low solubility compound and an excipient at at least one predefined pH value. The method allows a fast, accurate, and economic evaluation of an excipient being capable of optimizing the absorption of drug molecules, i.e. low solubility compounds. Furthermore, animal experiments can be excluded and use of compounds can be reduced in such evaluation. Thus, screening for future formulation efficacy (pH and excipient effects on solubility and permeability) of drug candidates can be justified, since the method is fast, compound-sparing, cost-effective, and reasonably accurate.
    Type: Grant
    Filed: February 27, 2007
    Date of Patent: May 8, 2012
    Assignees: F. Hoffmann-La Roche AG, pION Inc.
    Inventors: Alex Avdeef, Manfred Kansy
  • Publication number: 20110040085
    Abstract: The invention relates to a dry or slurry process to prepare phosphate-crosslinked cellulose ethers from a cellulose starting material comprising the steps of adding an alkalizing agent to the cellulose starting material to achieve mercerization, adding an ethehfying agent to the reaction mixture to achieve etherification of the cellulose, and adding a crosslinking agent to the reaction mixture to achieve crosslinking of the cellulose, wherein at least part of the alkalizing agent is added to the cellulose starting material before the etherification and/or crosslinking reactions take place to obtain alkalized cellulose; the crosslinking agent and the etherifying agent are added one after the other in random order or simultaneously; the crosslinking agent is an alkali metal thmetaphosphate; and the crosslinking and etherification steps are performed at an elevated temperature.
    Type: Application
    Filed: April 10, 2009
    Publication date: February 17, 2011
    Applicant: AKZO NOBEL N.V.
    Inventor: Paulus Pieter De Wit
  • Patent number: 7319146
    Abstract: The present invention relates to a nonionic methyl ethyl hydroxyethyl cellulose ether having a flocculation temperature of 70-95° C., a DS-methyl of 0.1-0.8 and a DS-ethyl of 0.1-0.7. The cellulose ether has versatile properties and may be used as a thickening agent or a rheology modifier in an aqueous formulation, such as an aqueous latex-containing paint composition. A process for manufacturing the cellulose ether is also disclosed.
    Type: Grant
    Filed: January 16, 2004
    Date of Patent: January 15, 2008
    Assignee: Akzo Nobel N.V.
    Inventors: Peter Boström, Kenneth Sundberg
  • Patent number: 7151173
    Abstract: A nonionic water-soluble cellulose ether is characterized in that when 3 pbw of the nonionic water-soluble cellulose ether is added to a mixture of 90 pbw of cordierite, 10 pbw of ordinary Portland cement, and 33 pbw of water, immediately followed by kneading at 20° C. and 20 rpm, a maximum torque for kneading is reached within 180 seconds from the addition. It is suitable as an admixture for extrudable hydraulic compositions. The hydraulic composition to which the inventive admixture is added can be kneaded within a brief time into a uniform mass which is smoothly extrudable.
    Type: Grant
    Filed: March 19, 2003
    Date of Patent: December 19, 2006
    Assignee: Shin-Etsu Chemical Co., Ltd.
    Inventors: Yoshiaki Sasage, Tsutomu Yamakawa
  • Patent number: 7098327
    Abstract: A process for the production of dual-functional ion exchange resins from lignocellulosic agricultural material involving anionization of the lignocellulosic agricultural material with citric acid and then cationization of the lignocellulosic agricultural material with dimethyloldihydroxyethylene urea (DMDHEU) and choline chloride, or cationization of the lignocellulosic agricultural material with DMDHEU and choline chloride and then anionization of the lignocellulosic agricultural material with citric acid.
    Type: Grant
    Filed: August 19, 2004
    Date of Patent: August 29, 2006
    Assignee: The United States of America as represented by the Secretary of Agriculture
    Inventors: Wayne E. Marshall, Lynda H. Wartelle
  • Patent number: 7026471
    Abstract: The present invention relates to a purification method of hydroxypropylmethyl cellulose phthalate, more particularly to a method of preparing high-purity hydroxypropylmethyl cellulose phthalate through a simple crushing process which comprises: increasing fluidity of reaction product mixture by adding fluidization solvent as a post-treatment process; and spraying it into water through a spray nozzle. As a result, formation of fine granular hydroxypropylmethyl cellulose phthalate particles prevents inter-particle coagulation during the a post-treatment process, and phthalic anhydride reactant, free phthalic acid and remaining acetic acid solvent can be removed effectively.
    Type: Grant
    Filed: April 2, 2002
    Date of Patent: April 11, 2006
    Assignee: Samsung Fine Chemicals Co., Ltd.
    Inventors: Kyu-Il Cho, Hyon-Ho Baek
  • Patent number: 7022837
    Abstract: The present inventors have discovered that the solution rheology of cellulose ethers prepared from cellulose pulp is altered by mercerizing and recovering cellulose pulp before preparing the cellulose ethers. For example, the solution viscosity of carboxymethyl cellulose (CMC) produced from mercerized and recovered cellulose pulp is significantly greater than that produced from non-mercerized cellulose pulp. The present invention provides a method of preparing cellulose ethers comprising the steps of (a) obtaining mercerized and recovered cellulose pulp, and (b) converting the mercerized and recovered cellulose pulp into the cellulose ethers. According to one embodiment, the cellulose pulp is southern softwood kraft and the mercerized cellulose pulp has a TAPPI 230 om-89 viscosity of at most 12 cP. This method, however, may be applied to all cellulose pulps, regardless of their viscosities, including those which, when mercerized, have a viscosity greater than 12 cP.
    Type: Grant
    Filed: October 31, 2001
    Date of Patent: April 4, 2006
    Assignee: BKI Holding Corporation
    Inventors: Roger Bruce Harding, Susan L. H. Crenshaw, Paul Eugene Gregory, Denise Hartnett Broughton
  • Patent number: 6914139
    Abstract: In a cellulose acylate solution, cellulose acylate is dissolved in an essentially non-chlorinated solvent. The essentially non-chlorinated solvent is a mixture of a ketone having a solubility parameter of 19 to 21 and an ester having a solubility parameter of 19 to 21. The solution further contains a releasing agent.
    Type: Grant
    Filed: November 9, 2001
    Date of Patent: July 5, 2005
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Yasuo Mukunoki, Tsukasa Yamada
  • 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: 5994531
    Abstract: Water-soluble, nonionic cellulose ethers selected from the group consisting of alkylcelluloses and hydroxyalkylcelluloses having an average degree of polymerization of less than 900 which is substituted by, on average, from 0.01 to 0.04 2-propenyl groups per anhydroglucose unit are used as protective colloids in the preparation of aqueous polymer dispersions.
    Type: Grant
    Filed: March 2, 1998
    Date of Patent: November 30, 1999
    Assignee: Clariant GmbH
    Inventors: Reinhard Doenges, Rudolf Ehrler, Horst Wurm
  • Patent number: 5583214
    Abstract: Cellulose ether derivatives comprising a hydrophobic substituent having an unsaturated alkyl portion are disclosed. The unsaturation in the alkyl portion of the hydrophobic substituent can promote crosslinking of the cellulose ether derivative. The cellulose ether derivatives are useful as ingredients in latex compositions. The cellulose ether derivatives can provide associative thickening and rheological properties to latex composition during storage and application. In addition, after the latex composition is applied to the surface to be coated, the cellulose ethers of the present invention can promote crosslinking of the latex film to provide a hard and durable coating. Latex paint compositions comprising the cellulose ether derivatives of the present invention are also disclosed.
    Type: Grant
    Filed: June 5, 1995
    Date of Patent: December 10, 1996
    Assignee: Union Carbide Chemicals & Plastics Technology Corporation
    Inventor: Emmett M. Partain, III
  • Patent number: 5541255
    Abstract: A bed of water insoluble, transparent, cross-linked gel, suitable for use in electrophoresis, is formed by dissolving a polysaccharide, including at least one linear polysaccharide such as agarose or hydroxyethyl cellulose, in a suitable solvent, such as water; adding a cross-linking agent, which is not charged nor becomes charged upon contact with water in a pH range of 2 to 11, to the solution; and incubating this mixture in a quiescent state to substantially simultaneously react the polysaccharide and the cross-linking agent and to gel the reaction product into a bed. The polysaccharide is at least one linear polysaccharides, but that linear polysaccharide may also be admixed with other linear polysaccharides and/or at least one non-linear polysaccharide. Synthetic organic polymers may also be admixed in the cross-linking reaction mixture.
    Type: Grant
    Filed: June 30, 1994
    Date of Patent: July 30, 1996
    Assignee: Guest Elchrom Scientific, Ltd.
    Inventor: Branko Kozulic
  • Patent number: 5527902
    Abstract: Bead-shaped cellulose products and a process for the manufacturing of such ead-shaped porous cellulose products provide improved characteristics, particularly a hydrophilic, reversibly expandable cellulose matrix with a pore structure that can be adjusted within wide ranges in a targeted manner while non-specific mutual reactions are simultaneously suppressed by biomacromolecules.
    Type: Grant
    Filed: November 14, 1994
    Date of Patent: June 18, 1996
    Assignee: Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V.
    Inventors: Fritz Loth, Carola Fanter
  • Patent number: 5498705
    Abstract: Disclosed is a method for producing a surface-crosslinked, modified polysaccharide having improved absorption properties. The method involves forming a mixture of water and a crosslinking agent, adding a generally water-soluble, modified polysaccharide to said mixture wherein the surface of the polysaccharide becomes crosslinked, and drying the modified polysaccharide. Also described is a surface-crosslinked, modified polysaccharide having improved absorption properties.
    Type: Grant
    Filed: February 22, 1995
    Date of Patent: March 12, 1996
    Assignee: Kimberly-Clark Corporation
    Inventor: Jian Oin
  • Patent number: 5470964
    Abstract: Disclosed is a method for producing a surface-crosslinked, modified polysaccharide having improved absorption properties. The method involves forming a mixture of water and a crosslinking agent, adding a generally water-soluble, modified polysaccharide to said mixture wherein the surface of the polysaccharide becomes crosslinked, and drying the modified polysaccharide. Also described is a surface-crosslinked, modified polysaccharide having improved absorption properties.
    Type: Grant
    Filed: September 2, 1993
    Date of Patent: November 28, 1995
    Assignee: Kimberly-Clark Corporation
    Inventor: Jian Qin
  • Patent number: 5346542
    Abstract: A novel polymer aqueous dispersion of enteric cellulose derivatives without ester bonded substituents, of which anionic functional groups form salts with cations. The aqueous dispersion of the present invention is used as coating agents for foods and pharmaceuticals. It has high dispersion stability such as high mechanical stability and high storage stability.
    Type: Grant
    Filed: November 6, 1992
    Date of Patent: September 13, 1994
    Assignee: Asahi Kasei Kogyo Kabushiki Kaisha
    Inventors: Honda Yosuke, Tanabe Tsuneaki, Yaginuma Yoshihito
  • Patent number: 5328905
    Abstract: New 8,9-annelated-1,2,3,4-tetrahydro-.beta.-carboline derivatives of the formula ##STR1## wherein R.sub.1 -R.sub.7 are as defined herein; and pharmaceutically acceptable salts and prodrugs thereof. A method of dissolving blood clots using this compound and a pharmaceutical composition having fibrinolytic activity comprising this compound are also part of the present invention.
    Type: Grant
    Filed: December 23, 1991
    Date of Patent: July 12, 1994
    Assignee: Duphar International Research B.V.
    Inventors: Derk Hamminga, Ineke van Wijngaarden, Johannes W. C. M. Jansen
  • Patent number: 5290829
    Abstract: A purified hydroxyethylcellulose (HEC) or hydroxypropylcellulose (HPC) reacts with a perfluorinated alkyl glycidyl ether to produce an associative thickener wherein a fluorinated C.sub.8 chain is nearly as effective as a hydrocarbyl C.sub.16 straight chain hydrophobe. A preferred glycidyl ether is prepared by reacting a terminal hydroxyl of a perfluorinated surfactant with epichlorohydrin.
    Type: Grant
    Filed: April 2, 1992
    Date of Patent: March 1, 1994
    Assignee: Aqualon Company
    Inventors: John D. Angerer, Thomas G. Majewicz, Makram H. Meshreki
  • Patent number: 5186847
    Abstract: The present invention relates to methods of preparing and using substantially debris-free gelled aqueous well treating fluids containing a cellulose gelling agent. The preparation methods comprise the steps of forming a gelled aqueous fluid and then mixing an amine phosphonate compound therewith to cause the hydration of unhydrated gelling agent remaining therein.
    Type: Grant
    Filed: January 30, 1991
    Date of Patent: February 16, 1993
    Assignee: Halliburton Company
    Inventors: R. Clay Cole, Bobby K. Bowles
  • Patent number: 5008385
    Abstract: Cellulose derivatives are disclosed which have the following formula: ##STR1## wherein Z is selected from the group consisting of alkylene, alkenylene, alkynylene, cycloalkylene or benzylene or xylylene radicals, which may or may not be substituted;X is selected from the group consisting of --H, --NR.sub.2, --N.sup.+ R.sub.3, --CN, --COOH, --SO.sub.3 H, --SO.sub.3 H, --PO(OR).sub.2, CONR.sub.2 or --Si(OR).sub.3 ;R is selected from the group consisting of hydrogen, alkyl and alkenyl groups having from 1 to 25 carbon atoms, and cycloalkyl, tolyl and phenyl groups;Y is selected from the group consisting of alkyl, alkenyl, alkynyl groups having from 1 to 36 carbon atoms, which may or may not be substituted, cycloalkyl, phenyl, tolyl and benzyl groups, ##STR2## (--CH.dbd.CH--COOH), and NHR, where R has the same meaning as in X, andm=0 to 2.5n=0.01 to 2.95,with the provision that, when m=0, n.gtoreq.1.55, if Y is an alkyl radical with 1 to 5 carbon atoms, 3-(CH.sub.2).sub.
    Type: Grant
    Filed: July 15, 1988
    Date of Patent: April 16, 1991
    Assignee: Akzo N.V.
    Inventor: Michael Diamantoglou
  • Patent number: 4994509
    Abstract: Aqueous dispersion of a multicolored wall coating composition comprising colored minerals in the form of quartz granules having transparent or translucent fibers agglomerated thereto, wherein said minerals are transparent or translucent after drying.
    Type: Grant
    Filed: October 27, 1988
    Date of Patent: February 19, 1991
    Inventor: Alain Laurent
  • Patent number: 4803264
    Abstract: The invention provides a process for the preparation of a polysaccharide in oil dispersion which comprises the steps of(a) forming a water-in-oil emulsion by dispersing in oil an aqueous solution of polysaccharide, in the presence of at least one dispersion promoter,(b) drying the resulting emulsion azeotropically, and(c) physically isolating from the resulting azeotropically dried residue an oil phase containing oil and dispersion promoter and a polysaccharide in oil dispersion in the form of a suspension phase containing polysaccharide, dispersion promotor and oil;and a polysaccharide in oil dispersion prepared by the process containing 40 to 50% w/w polysaccharide and 3 to 4.5% w/w of at least one dispersion promoter.
    Type: Grant
    Filed: November 25, 1986
    Date of Patent: February 7, 1989
    Assignee: Shell Oil Company
    Inventors: Wilhelmus J. Krijnen, Jacob B. Roest, Jacob Bloemheuvel
  • Patent number: 4696762
    Abstract: A process is used to increase the rate and quality of dispersion of hydroxypropylmethylcellulose (HPMC) in water. The HPMC is dry blended in a fluidized bed by intermittently spraying the HPMC particles with a liquid spray while the particles are in the fluidized state causing the surfaces of the particles to become tacky and the particles to stick to each other. The particles are permitted to dry between spraying intervals and the spraying and drying is continued until agglomerated particles are formed having a moisture content of less than 25% by weight of the agglomerated particle.
    Type: Grant
    Filed: December 6, 1985
    Date of Patent: September 29, 1987
    Assignee: Zumbro Enterprises, Inc.
    Inventors: Eugene H. Sander, Douglas R. Cook
  • Patent number: 4689408
    Abstract: Disclosed are novel sodium salt of carboxymethylcellulose (CMC) which are substantially nonfibrous, have a degree of substitution (D.S.) of 0.2 to 0.9 and an absorbency of at least 25 g. liquid/g. the novel CMC material, and are prepared from a cellulose furnish having a degree of polymerization (D.P.) of greater than 1,000; and to processes for preparing same. Owing to their high absorbency properties, they are particularly useful in the manufacture of disposable nonwoven products, such as adult incontinence pads, feminine hygiene products, disposable diapers and surgical dressings.
    Type: Grant
    Filed: July 7, 1986
    Date of Patent: August 25, 1987
    Assignee: Hercules Incorporated
    Inventors: Robert A. Gelman, Eleanor C. Hawkins
  • Patent number: 4634438
    Abstract: Hygienic products of various types, all comprising as their operative body contact portion a fiber mass of acidic, modified, pH-regulating, cellulose.
    Type: Grant
    Filed: October 12, 1984
    Date of Patent: January 6, 1987
    Assignee: Henkel Kommanditgesellschaft auf Aktien
    Inventors: Scarlet Sustmann, Ingo G. Marini
  • Patent number: 4634439
    Abstract: A cellulose fiber which is carboxyalkylated in free acid form, a fiber mass formed therefrom, and a method for producing such fiber.
    Type: Grant
    Filed: October 12, 1984
    Date of Patent: January 6, 1987
    Assignee: Lenzing Aktiengesellschaft
    Inventors: Scarlet Sustmann, Ingo G. Marini
  • Patent number: 4622153
    Abstract: A liquid polymer containing composition, useful as a thickening agent for aqueous systems, containing hydroxyethyl cellulose, a hydrophobic liquid medium in which the hydroxyethyl cellulose is substantially non-swellable and a gelling agent for thickening the hydrophobic liquid.
    Type: Grant
    Filed: January 25, 1980
    Date of Patent: November 11, 1986
    Assignee: NL Industries, Inc.
    Inventors: Kenneth E. Watson, Keith W. Sharp
  • Patent number: 4615882
    Abstract: An aqueous anti-microbial disinfectant solution for contact lenses contains an effective amount of an active ingredient which is an anti-microbial, organosilicon quaternary ammonium salt chemically bonded to a water soluble, high molecular weight organic polymer. The solution is non-toxic and non-irritating to the eye, and does not adsorb or penetrate into a contact lens.
    Type: Grant
    Filed: May 2, 1985
    Date of Patent: October 7, 1986
    Inventor: Richard F. Stockel
  • Patent number: 4584370
    Abstract: The present invention is directed to a method of producing calcium cellulose glycolate. Basically, the method comprises converting sodium cellulose glycolate to calcium cellulose glycolate in a heterogeneous reaction system under particular reaction conditions.
    Type: Grant
    Filed: August 13, 1984
    Date of Patent: April 22, 1986
    Inventors: Jun Taguchi, Hiroomi Kobayashi, Takahiro Koyama
  • Patent number: 4582614
    Abstract: A polymeric composition useful in the thickening of aqueous brines comprising hydroxyethyl cellulose, a water miscible organic liquid and an aqueous liquid.
    Type: Grant
    Filed: April 11, 1983
    Date of Patent: April 15, 1986
    Assignee: NL Industries, Inc.
    Inventors: Roy F. House, Lonnie D. Hoover
  • Patent number: 4581446
    Abstract: Impurities in cellulose ether compositions are removed by providing a functionally effective thickness of a cellulose ether composition to a filtration device, and contacting the thickness, in a manner such that substantial thickness is maintained with at least one extracting solution in which the impurities in the cellulose ether are soluble such that a gradient impurity concentration is formed. High purity cellulose ethers are prepared, without experiencing large product losses.
    Type: Grant
    Filed: March 15, 1985
    Date of Patent: April 8, 1986
    Assignee: The Dow Chemical Company
    Inventor: Gary J. Schulz
  • Patent number: 4566977
    Abstract: Described herein is an improved non-aqueous slurry suitable for use as a thickener or viscosifier in oil or gas drilling, fracturing, flow diversion, completion or workover fluids, which slurry comprises a water-soluble cellulose ether polymer, a water-insoluble liquid hydrocarbon, a non-ionic surfactant having an HLB of from about 7 to about 14, and an organo modified clay.
    Type: Grant
    Filed: February 28, 1985
    Date of Patent: January 28, 1986
    Assignee: Union Carbide Corporation
    Inventor: James C. Hatfield
  • Patent number: 4537958
    Abstract: Non-gelling cellulose ethers are purified by mixing same with a dialdehyde under acidic conditions and under high agitation, forming a slurry of the treated cellulose ether, rapidly transferring the slurry to a filter and then dewatering said slurry.
    Type: Grant
    Filed: June 29, 1984
    Date of Patent: August 27, 1985
    Assignee: The Dow Chemical Company
    Inventors: Carl P. Strange, Harold B. Martin, Jr., Albert C. Tsang
  • Patent number: 4536217
    Abstract: The invention pertains to the absorbing dressing for wounds, which consists of spherical particles of regenerated cellulose of the size 0.05-0.5 mm (preferably 0.05-0.3 mm) and a macroporous structure characterized by the cyclohexane regain of the dry material at least 0.2 ml/g. The dressing is prepared from the regenerated cellulose swollen with water by replacement with organic solvents and the subsequent drying of the product swollen with the said solvent. The porous structure of the dressing warrants that it can absorb excretions of the wound in the amount 1.5 to 5 g water per g of solids; the grainy macrostructure remains preserved during the absorption so that the material applied on the wound in the form of a powder in the layer 2-5 mm thick, in particular 2-3 mm thick, can be without difficulties and almost without pain rinsed away with water.
    Type: Grant
    Filed: September 28, 1983
    Date of Patent: August 20, 1985
    Assignees: Ceskoslovenska akademie ved of Praha, Akademie der Wissenschaften der DDR
    Inventors: Fritz Loth, Horst Dautzenberg, Jiri Stamberg, Jan Peska, Dieter Bertram, Herbert Lettau
  • Patent number: 4521594
    Abstract: A process for producing sodium carboxymethylcellulose having an excellent dispersibility in water by heat-treating sodium carboxymethylcellulose to crosslink the same. The starting sodium carboxymethylcellulose has an equivalent ratio of the free carboxylic acid group to the sodium carboxylate of at least 0.01 to 100 and a viscosity of at least 100 cP (as a 1% aqueous solution).
    Type: Grant
    Filed: June 20, 1984
    Date of Patent: June 4, 1985
    Assignee: Daicel Chemical Industries, Ltd.
    Inventor: Tetuo Kanematu
  • Patent number: 4508894
    Abstract: The present invention provides a novel water-soluble acid-type carboxymethyl cellulose characterized by:(a) having a total degree of substitution "x" by carboxymethyl group of 0.42 to 3.00 per anhydrous glucose unit, the degree of substitution "y" by acid-type carboxymethyl groups being to 100% of the total degree of substitution, provided that when "x" is less than 2.0, "y" shall be less than (1.25.times.-0.5), the remaining carboxymethyl group being of the alkali salt type,(b) having an average degree of polymerization of 50 to 1500, and(c) being soluble in water,which is useful as dispersant, carrier, coating agent and various other materials and also as an intermediate for carboxymethyl cellulose derivatives; and a process for preparing them.
    Type: Grant
    Filed: December 23, 1983
    Date of Patent: April 2, 1985
    Assignee: Daicel Chemical Industries Ltd.
    Inventor: Takeo Omiya
  • Patent number: 4474950
    Abstract: Modified cellulose reaction products, which are dispersible in aqueous media over a broad pH range without lump formation, are prepared by reacting water-soluble cellulose ether with a specified silane modifying agent in the amount of from 0.0001 to 0.12 mole of modifying agent per mole of cellulose in the cellulose ether.
    Type: Grant
    Filed: August 26, 1983
    Date of Patent: October 2, 1984
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Utz-Hellmuth Felcht, Helmut Berenbold
  • Patent number: 4439333
    Abstract: Polymeric compositions for, and methods of, increasing the viscosity of aqueous brine well servicing fluids comprising adding to the brine a composition containing hydroxyethyl cellulose, a solid organic activating agent for the hydroxyethyl cellulose, and a solvent for the activating agent which also functions as a suspending medium or carrier for the hydroxyethyl cellulose.
    Type: Grant
    Filed: May 8, 1981
    Date of Patent: March 27, 1984
    Assignee: NL Industries, Inc.
    Inventors: Roy F. House, Lonnie D. Hoover
  • Patent number: 4435564
    Abstract: Processes are disclosed for activating hydroxyethyl cellulose (HEC) such that the HEC will disperse and hydrate in compatible heavy brines having a density greater than about 13.5 pounds per gallon containing one or more salts selected from the group consisting of calcium chloride, calcium bromide, zinc chloride, and zinc bromide, at ambient temperatures such that the HEC will be at least 80% hydrated within one hour.The activation process comprises admixing the HEC with an organic liquid which has no appreciable swelling effect on the HEC and an amine activator.The invention also provides activated HEC compositions and a process of increasing the viscosity of a heavy brine utilizing these compositions.
    Type: Grant
    Filed: June 7, 1982
    Date of Patent: March 6, 1984
    Assignee: Venture Innovations, Inc.
    Inventor: Roy F. House
  • Patent number: 4400502
    Abstract: Anionic, water-soluble cellulose ethers which are treated with a mixture of glyoxal and a sodium borate, preferably borax, readily disperse in aqueous solutions without clumping or agglomerating. These treated compounds can be formed by contacting an organic slurry of an anionic, water-soluble cellulose ether with an aqueous solution of glyoxal and a sodium borate, recovering the product and then drying it.
    Type: Grant
    Filed: April 27, 1982
    Date of Patent: August 23, 1983
    Assignee: Hercules Incorporated
    Inventor: Thomas G. Majewicz
  • Patent number: 4368323
    Abstract: The absorbent material is treated to increase its wettability in a substantive manner. This is accomplished by reacting a diepoxide compound with an absorbent material selected to have accessible hydroxyl groups and with a surfactant having functional end groups selected from the group consisting of primary amine or hydroxyl groups.
    Type: Grant
    Filed: September 21, 1981
    Date of Patent: January 11, 1983
    Assignee: Personal Products Company
    Inventor: Richard P. James
  • Patent number: 4357469
    Abstract: A carrier base material adapted to be combined with a therapeutically active medicament and shaped and compressed to form a sustained release therapeutic composition having a long-lasting, slow and regular incremental release of the medicament upon administration, the carrier base material being hydroxypropylmethylcellulose or a mixture of hydroxypropylmethylcellulose and either up to 30% ethylcellulose or 30% sodium carboxymethylcellulose or both, and wherein the carrier base material has been subjected to hydrolysis and oxidation successively or concurrently until the carbonyl content ranges from 0.2-3.0 grams/100 grams, the carboxyl content ranges from 0.60-2.60 grams/100 grams and the moisture content is in the range of 0.5-3.9%.
    Type: Grant
    Filed: June 29, 1981
    Date of Patent: November 2, 1982
    Assignee: Forest Laboratories, Inc.
    Inventor: Joseph M. Schor
  • Patent number: 4340731
    Abstract: Polycarboxyalkyl-cellulose characterized by exceptionally high fluid absorbing and retaining capacities is obtained by oxidizing, under particular conditions, hydroinsoluble, cross-linked carboxyalkyl-cellulose having a substitution degree greater than 0.35.
    Type: Grant
    Filed: June 19, 1980
    Date of Patent: July 20, 1982
    Assignee: Montedison S.p.A.
    Inventors: Virginio Colombo, Alberto Nicoletti, Benito Casu
  • Patent number: 4321367
    Abstract: In the preparation of etherified polysaccharides, the inclusion of a polyhalo methane or an alkylene dihalide in the etherification reaction mixture yields a water-soluble, cross-linked product which exhibits increased viscosities in aqueous solution. For example, the admixture of a cellulose, e.g., cotton linter; an alkali metal hydroxide; etherifying agents such as methyl chloride or propylene oxide; and 1,2-dichloroethane in a reaction diluent such as toluene can be heated to form a water-soluble, cross-linked hydroxypropyl methylcellulose exhibiting increased solution viscosities.
    Type: Grant
    Filed: September 2, 1980
    Date of Patent: March 23, 1982
    Assignee: The Dow Chemical Company
    Inventors: Wen-Jiu Cheng, Ernie V. Luoma
  • Patent number: 4309535
    Abstract: Easily dispersible anionic water-soluble polymers are disclosed which are prepared by lightly treating particulate water-soluble polymer with a water-soluble aluminum salt and an aluminum chelant. Rate of hydration is retarded when the particles are added to aqueous media, allowing the particles to be dispersed completely before their surfaces hydrate sufficiently to gel and prevent complete dissolution.
    Type: Grant
    Filed: September 5, 1980
    Date of Patent: January 5, 1982
    Assignee: Hercules Incorporated
    Inventor: Thomas G. Majewicz
  • Patent number: 4294731
    Abstract: A method for oven drying chemically modified cellulosic materials, especially fibers, having improved fluid absorbency involves incorporating into the cellulose structure while swollen an amphiphilic compound miscible with water which will not evaporate when the fiber is oven dried and will remain in the fiber to prevent collapse of the fiber as the water is removed. The improved method of drying the fibrous cellulosic material produces a product having saline absorbency about equal to that produced when the fibers are dried with a water-miscible solvent and avoids the use of volatile solvents and the disadvantages inherent therewith. The fibers provided by the invention are especially suitable for use in pads which are to be used for absorbing water and body fluids.
    Type: Grant
    Filed: August 13, 1980
    Date of Patent: October 13, 1981
    Assignee: Akzona Incorporated
    Inventor: Thomas C. Allen
  • Patent number: RE31323
    Abstract: A process for the preparation of substantially water-insoluble, particulate sodium carboxymethyl cellulose, suitable for use as an absorbent in tampons and other catamenial devices, or the like. The process involves treating solid, water-soluble sodium carboxymethyl cellulose having a degree of substitution of at least 0.4 with hydrogen chloride gas and heating the carboxymethyl cellulose, either after the hydrogen chloride treatment or concurrently therewith, to produce a cross-linked, insoluble, partially acid form carboxymethyl cellulose suitable for absorbent applications.
    Type: Grant
    Filed: April 19, 1982
    Date of Patent: July 26, 1983
    Assignee: International Playtex, Inc.
    Inventors: Herman L. Marder, Nathan D. Field, Makoto Shinohara