Hydroxyalkyl Containing Patents (Class 536/91)
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Cellulose ethers containing butenyl groups and use thereof as protective colloids in polymerizations
Patent number: 6111011Abstract: Water-soluble, nonionic cellulose ethers selected from the group consisting of alkylcelluloses and hydroxyalkylcelluloses which are additionally substituted by butenyl groups are used as protective colloids in the preparation of aqueous polymer dispersions.Type: GrantFiled: November 19, 1998Date of Patent: August 29, 2000Assignee: Clariant GmbHInventors: Reinhard Doenges, Rudolf Ehrler, Horst Wurm -
Patent number: 6068697Abstract: A polysaccharide derivative prepared by replacing all or part of the hydroxyl hydrogen atoms of a polysaccharide or polysaccharide derivative by (A) a hydrophobic substituent having a C.sub.8 -C.sub.43 hydrocarbon chain as the partial structure and (B) an ionic hydrophilic substituent having at least one member selected from the group consisting of sulfonic, carboxyl phosphoric, and sulfate groups and salts thereof as the partial structure, wherein the average degree of replacement by the substituent (A) is 0.0001 or above but below 0.001 per constituent monosaccharide residue as determined by Zeisel's method or the diazomethane method and that by the substituent (B) is 0.01 to 2.0 per constituent monosaccharide residue as determined by colloidal titration. This polysaccharide derivative is useful as the admixture for hydraulic materials and can give stable hydraulic compositions excellent in dispersion.Type: GrantFiled: July 14, 1998Date of Patent: May 30, 2000Assignee: Kao CorporationInventors: Hotaka Yamamuro, Takeshi Ihara, Tomohito Kitsuki, Tetsuya Miyajima, Fujio Yamato, Makoto Kohama
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Patent number: 6054511Abstract: Hydroxyethylcellulose (HEC), hydrophobically modified hydroxyethylcellulose (HMHEC), hydroxypropylcellulose (HPC), methylhydroxypropylcellulose (MHPC), carboxymethylhydroxyethylcellulose (CMHEC), guar, starch, xanthan, hydroxypropylguar (HP Guar) or carboxymethylhydroxypropylguar (CMHP Guar) are stepwise or continuously reacted with hydrogen peroxide to produce aqueous compositions with a solids content greater than 5% by weight at a viscosity at 25.degree. C. below 9500 mPa.s. It is preferred to use 30-50% hydrogen peroxide to depolymerize the polysaccharide.Type: GrantFiled: January 15, 1993Date of Patent: April 25, 2000Assignee: Aqualon CompanyInventors: J David Angerer, Jashawant Jamanadas Modi, Robert C Szafranski
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Patent number: 5994531Abstract: 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: GrantFiled: March 2, 1998Date of Patent: November 30, 1999Assignee: Clariant GmbHInventors: Reinhard Doenges, Rudolf Ehrler, Horst Wurm
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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: 5840882Abstract: Cellulose ethers which contain hydroxyalkyl groups are prepared, with the recovery of sodium hydroxide, by cellulose being etherified with alkylene oxide in a water-containing organic suspension medium in the presence of at least 1.0 mol of sodium hydroxide per mole of anhydroglucose units, the water-containing organic suspension medium being separated off after the etherification reaction is complete, the crude cellulose ether being extracted with a suitable solvent mixture, the lower-boiling organic components being distilled off from the solvent mixture after the extraction, the water-containing organic suspension medium separated off being added to the distillation residue of the solvent mixture to form a multiphase mixture, the bottom phase of the multiphase mixture being separated and the sodium hydroxide present in the bottom phase being reused.Type: GrantFiled: August 20, 1997Date of Patent: November 24, 1998Assignee: Clariant GmbHInventors: Reinhard Doenges, Rudolf Ehrler
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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
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Patent number: 5827835Abstract: Thermally gelling emulsion compositions which reversibly increase in either loss modulus or storage modulus, or both, upon contact with the eye, skin, mucous membrane or body cavity are disclosed. The emulsion compositions contain one or more nonionic substituted cellulose ethers and do not require a charged surfactant or a pH-sensitive polymer for such increase in loss modulus or storage modulus, or both, upon administration. In one embodiment, the compositions gel upon instillation in the eye.Type: GrantFiled: December 3, 1996Date of Patent: October 27, 1998Assignee: Alcon Laboratories, Inc.Inventor: Bhagwati P. Kabra
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Patent number: 5814141Abstract: The invention relates to a liquid crystalline, photo cross-linkable main-chain polymer used as interferentially effective, chromophoric substance for colored paints, in which the main mesogenic groups are disposed at least approximately in a chiral-nematic manner. An etherified cellulose ether or a mixture of several etherified cellulose ethers is used pursuant to the invention as liquid crystalline main-chain polymer or polymers wherein:the cellulose ethers have a molecular weight of 500 to 1,000,000,the anhydroglucose units of the cellulose ethers are etherified with an average degree of molar substitution of 2 to 7 with propylene oxide or ethylene oxide units (C.sub.3 H.sub.6 O- or C.sub.2 H.sub.4 O-units), andthe cellulose ethers are etherified with an average degree of molar substitution of 1.5 to 3 with unsaturated hydrocarbon groups (C.sub.r H.sub.2r-1).Type: GrantFiled: November 27, 1996Date of Patent: September 29, 1998Assignee: Daimler-Benz AGInventors: Martin Kirschbaum, Maria-Theresia Sailer, Fritz Dannenhauer, Hartmut Seliger
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Patent number: 5804166Abstract: Disclosed are hair spray compositions containing non-ionic cellulosic ethers in a solvent base containing water and volatile organic solvent wherein the level of volatile organic solvent in the composition is about 80% or less, and wherein the non-ionic cellulose ether is characterized by a solution viscosity of less than about 50 cps at 25.degree. C. for an aqueous solution containing 3 wt. % solids and 55 wt. % ethanol. The preferred non-ionic cellulosic ether is methylhydroxypropyl cellulose.Type: GrantFiled: May 9, 1997Date of Patent: September 8, 1998Assignee: Hercules IncorporatedInventors: Anita N. Chan, Anthony B. Clayton, Jashawant J. Modi
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Patent number: 5770528Abstract: The present invention is directed to a method of producing methylated hydroxypropylcellulose (m-HPC). By controlling the degree of methylation, one can manipulate the lower critical solution temperature (LCST) of the m-HPC polymer to below room temperature and thereby stabilize the polymer in water above about 30.degree. C. The present invention is also directed to binder compositions, fibrous substrates, water-dispersible products and thermoformable products containing the m-HPC polymer.Type: GrantFiled: December 31, 1996Date of Patent: June 23, 1998Assignee: Kimberly-Clark Worldwide, Inc.Inventors: Pavneet Singh Mumick, Yihua Chang
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Patent number: 5743949Abstract: The present invention relates to stable aqueous wax dispersions comprisingA) 5 to 65% by weight of microized wax andB) 0.01 to 7% by weight of polymeric carbohydrate derivatives as dispersing agent.The waxes are amide, montan and polyethylene waxes, and particularly suitable carbohydrate derivatives are cellulose ethers. These wax dispersions are suitable for the preparation of care compositions for automobiles, shoes, floors and stone, drawing compounds, aqueous wood varnishes, printing inks and paints, for leather treatment, in papermaking and as release agents.Type: GrantFiled: December 9, 1996Date of Patent: April 28, 1998Assignee: Hoechst AktiengesellschaftInventor: Hans Jurgen Kainz
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Patent number: 5719274Abstract: Low molecular weight cellulose ethers which are suitable as a coating material for solid metered units and as an additive in ceramic compositions or cosmetics formulations or as a polymerization auxiliary are obtained by irradiation of a mixture of a higher molecular weight cellulose ether and a base with electrons.Type: GrantFiled: September 22, 1995Date of Patent: February 17, 1998Assignee: Hoechst AktiengesellschaftInventors: Reinhard Doenges, Diethart Reichel
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Patent number: 5591844Abstract: The present invention relates to alkyl hydroxyalkyl cellulose ethers which contain a sulfoalkyl group as a further substituent, to a process for the preparation of these cellulose ethers and to building material mixtures which are based on gypsum, hydrated lime or cement and contain alkyl hydroxyalkyl cellulose ethers containing sulfoalkyl groups.Type: GrantFiled: November 28, 1994Date of Patent: January 7, 1997Assignee: Hoechst AktiengesellschaftInventors: Uwe Bartz, Reinhard D onges, Heiner Klehr
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Patent number: 5589589Abstract: A process and apparatus for screening cellulose ethers which have a finely fibrous or wad-like or woolly structure, wherein the process comprises the following steps:a) applying the cellulose ether (material to be screened) to a sieve surface,b) dividing the material to be screened into an screenable portion (acceptable size material or material passing through the sieve) and a circulating portion (oversize material or sieve surface tailings) with the aid of an agitated (preferably vibrating and/or tumbling) sieve surface,c) flushing through the agitated sieve surface from below, generally perpendicularly to the sieve surface, with an air flow,d) discharging (recovering) the acceptable size material, ande) discharging the circulating portion from the sieving system.The air flow inhibits clogging or plugging of or matting upon the sieve surface and is preferably directed upward by slit nozzles arranged below the sieve surface.Type: GrantFiled: April 11, 1995Date of Patent: December 31, 1996Assignee: Hoechst AGInventors: Manfred Sponheimer, Guenther Welt, Manfred Ziegelmayer
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Patent number: 5500124Abstract: The invention relates to a process for the purifying working-up of liquid reaction media and/or wash media obtained during preparation of cellulose ethers, which are insoluble in hot water, from cellulose, an alkali metal hydroxide and at least one etherifying agent in a medium containing water and if appropriate at least one organic solvent, by ultrafiltration of the media into a permeate and concentrate, which comprises carrying out the ultrafiltration of the reaction media and/or wash media at a temperature at or above the flocculation temperature of the cellulose ethers.Type: GrantFiled: December 3, 1992Date of Patent: March 19, 1996Assignee: Hoechst AGInventors: Heinz Wallisch, Reinhard Donges, Ulrich Meyer-Blumenroth
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Patent number: 5493013Abstract: Process for preparing cellulose ethers with cyclic ethers as suspending agents. The present invention relates to a process for preparing cellulose ethers from cellulose and alkylating agents, in the presence of water and bases and at least one water-miscible cyclic ether as the suspending agent, comprising the stages:a) alkalisation,b) subsequent alkylation,wherein the water-miscible cyclic ether is employed already in stage a) or, where appropriate, not until stage b).Type: GrantFiled: June 1, 1994Date of Patent: February 20, 1996Assignee: Hoechst AktiengesellschaftInventor: Diethart Reichel
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Patent number: 5488104Abstract: This invention is a process for comminuting a cellulose ether which comprises extruding a hydrated cellulose ether through a plurality of orifices, each orifice having a cross-sectional area of from about 7.5.times.10.sup.-9 m.sup.2 to about 1.times.10.sup.-6 m.sup.2, to form an elongated extrudate, and then cutting the elongated extrudate to desired length. The high density cellulose ether product is typically cold water dispersible, non-dusty, and free flowing.Type: GrantFiled: June 30, 1994Date of Patent: January 30, 1996Assignee: The Dow Chemical CompanyInventor: Gary J. Schulz
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Patent number: 5463037Abstract: A process for producing a mixed cellulose ether comprising reacting a starting cellulose ether with an etherifying agent is disclosed, wherein said starting cellulose ether comprises at least 18 mol % of a 6-substituted glucose unit and at least 15 mol % of an unsubstituted glucose unit. A high utilization of the etherfifying agent can be reached. The resulting mixed cellulose ether has a high solubility in water and an aqueous solution of the resulting mixed cellulose ether has excellent properties such as flow properties and clarity.Type: GrantFiled: June 1, 1994Date of Patent: October 31, 1995Assignee: Daicel Chemical Industries, Ltd.Inventors: Atsunobu Kiyose, Yonosuke Kato
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Patent number: 5407919Abstract: Double-substituted, water-soluble, cellulose ethers substituted with a cationic substituent and a hydrophobic substituent are disclosed. The levels of substitution for the cationic substituent and the hydrophobic substituent can provide enhanced properties when used in personal care compositions, such as, for example, enhanced substantivity, saline capability and low irritation potential to mucosal linings.Type: GrantFiled: September 29, 1993Date of Patent: April 18, 1995Inventors: George L. Brode, Russell L. Kreeger, George A. Salensky
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Patent number: 5395930Abstract: The present invention relates to alkyl hydroxyalkyl cellulose ethers which contain a sulfoalkyl group as a further substituent, to a process for the preparation of these cellulose ethers and to building material mixtures which are based on gypsum, hydrated lime or cement and contain alkyl hydroxyalkyl cellulose ethers containing sulfoalkyl groups.Type: GrantFiled: June 7, 1993Date of Patent: March 7, 1995Assignee: Hoechst AGInventors: Uwe Bartz, Reinhard Donges, Heiner Klehr
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Patent number: 5385607Abstract: The invention relates to a new class of water-soluble ionic cellulose derivatives and their use as additive for gypsum- and cement-containing compounds.Type: GrantFiled: January 27, 1993Date of Patent: January 31, 1995Assignee: Wolff Walsrode AGInventors: Rene Kiesewetter, Klaus Szablikowski, Werner Lange
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Patent number: 5360902Abstract: The present invention relates to a process for producing methyl hydroxyalkyl cellulose ethers by alkalisation and etherification of celluloses, rinsing the methyl hydroxyalkyl cellulose ethers with water at higher temperatures and recovering the short-chain cellulose ethers that are soluble in the wash water, wherein the wash water containing sodium chloride and organic by-products is passed across a first stage of a membrane filtration having a molecular cut size of 200 to 150,000 Dalton, is concentrated during this process and passes across a second stage of a membrane filtration.Type: GrantFiled: December 15, 1992Date of Patent: November 1, 1994Assignee: Wolff Walsrode AGInventors: Oke Brauer, Bernd Haase, Dieter Herzog, Lutz Riechardt, Gerd Sonnenberg, Dietrich Tegtmeier
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Patent number: 5358561Abstract: The invention relates to water-soluble ionic cellulose derivatives and their use as additives for gypsum- and cement-containing compounds.Type: GrantFiled: January 27, 1993Date of Patent: October 25, 1994Assignee: Wolff Warlsrode AGInventors: Rene Kiesewetter, Klaus Szablikowski, Werner Lange
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Patent number: 5302196Abstract: The invention relates to water-soluble cellulose ethers, containing at least one fluorine-free radical attached via an ether link and selected from the group hydroxyethyl, hydroxypropyl, methyl, ethyl and carboxymethyl, and a hydrophobic substituent which comprises one fluorine-containing alkyl radical of 3 to 24, in particular 5 to 18, carbon atoms, the fluorine content being 0.05 to 5, in particular 0.1 to 1% by weight, based on the dry weight of the cellulose ether.Type: GrantFiled: September 9, 1991Date of Patent: April 12, 1994Assignee: Hoechst AktiengesellschaftInventors: Christoph Meister, Reinhard Donges, Walter Schermann, Walter Schrattenholz
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Patent number: 5294702Abstract: This invention relates to water-soluble polymerisable 3-allyloxy-2-hydroxypropylethers of cellulose and to a process for their preparation.Type: GrantFiled: October 2, 1992Date of Patent: March 15, 1994Assignee: Wolff Walsrode AGInventors: Jorn Breckwoldt, Klaus Szablikowski
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Patent number: 5278203Abstract: Water-soluble, polymer viscosifiers of aqueous solutions, also known as gelling agents, can be suspended in a hydrocarbon carrier fluid, such as, diesel to prepare a liquid gel concentrate. When a liquid gel concentrate is added to an aqueous solution the gelling agent disperses into it and viscosifies it. To make an improved performance admixture for preparation of liquid gel concentrates and render the gelling agent suspendable in the hydrocarbon carrier fluid, it is first coated with a mixture of an oil-compatible polymer suspending agent, such as a polymer suspension, comprising a branched chain alkyl acrylate monomer copolymerized with a minor amount of hydrophilic monomer such as acrylic acid with an appropriate amount of internal crosslinking agent to control polymer particle size, and a surfactant such as a nonylphenol reacted with several moles of ethylene oxide, styrenated phenol ethoxylate, or a phosphate ester of styrenated phenol ethoxylate.Type: GrantFiled: November 5, 1992Date of Patent: January 11, 1994Assignee: Halliburton CompanyInventor: Weldon M. Harms
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Patent number: 5221790Abstract: Mixed polysaccharide compositions, well adopted for flocculating/precipitating solid particulates from liquid dispersions thereof and for the shaping of insulating articles therefrom, comprise (i) at least one polysaccharide prepared by microbial fermentation, the basic recurring structural unit of which comprising both glucose and rhamnose moieties, and (ii) at least one cationic natural polysaccharide or derivative thereof.Type: GrantFiled: July 30, 1991Date of Patent: June 22, 1993Assignee: Rhone-Poulenc ChimieInventors: Marie-Madeleine Besnard, Claire David, Magali Knipper
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Patent number: 5218107Abstract: This invention is a process of removing water-soluble impurities from a water-soluble cellulose ether aqueous solution containing such water-soluble impurities comprising treating an aqueous solution comprising a water-soluble cellulose ether and a water-soluble impurity by means of ultrafiltration and diafiltration at conditions effective to produce a treated aqueous solution having a reduced concentration of the water-soluble impurity and an increased concentration of the water-soluble cellulose ether.Type: GrantFiled: December 30, 1991Date of Patent: June 8, 1993Assignee: The Dow Chemical CompanyInventor: Gary J. Schulz
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Patent number: 5196527Abstract: This invention relates to ion-exchanged fine cellulose particles, porous fine cellulose particles which can be advantageously used as an affinity carrier, and methods of production thereof. These fine particles of the invention have the advantage that they possess excellent pressure-resistant strength and can treat treatment liquors under pressure at a high flowing velocity. Thus, they can be advantageously used industrially in various separation and purification processes.Type: GrantFiled: February 4, 1992Date of Patent: March 23, 1993Assignee: Kanebo Ltd.Inventors: Shigeru Ookuma, Kouei Igarashi, Masami Hara, Kazuhiro Aso, Hideo Yoshidome, Hiroshi Nakayama, Keizo Suzuki, Kazuhiko Nakajima
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Patent number: 5182380Abstract: Water-soluble, reversibly gelable cellulose ethers containing sulphoethyl groups (DS-sulphoethyl) and dihydroxpropyl groups (MS-dihydroxypropyl).Type: GrantFiled: July 30, 1991Date of Patent: January 26, 1993Assignee: Wolff Walsrode AktiengesellschaftInventors: Jorn Breckwoldt, Klaus Szablikowski
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Patent number: 5177199Abstract: Water-soluble hydroxypropyl sulfoethyl cellulose derivatives having an average degree of substitution (DS) with sulfoethyl groups of <0.3 and a molar degree of substitution (MS) with hydroxypropyl or <2.Type: GrantFiled: November 15, 1991Date of Patent: January 5, 1993Assignee: Wolff Walsrode AktiengesellschaftInventors: Rene Kiesewetter, Klaus Szablikowski
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Patent number: 5166333Abstract: The new thermoplastic methyl hydroxypropyl cellulose ethers have an average degree of substitution with methyl groups of 1.5 to 2.9 and a molar degree of substitution with hydroxypropyl groups of 1.4 to 1.9.Type: GrantFiled: May 2, 1991Date of Patent: November 24, 1992Assignee: Wolff Walsrode AktiengesellschaftInventor: Jorn Breckwoldt
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Patent number: 5166332Abstract: New alkenyl methyl hydroxypropyl cellulose ethers have an average degree of substitution DS with methyl groups of 1.5 to 2.9, a molar degree of substitution MS with hydroxypropyl groups of 1.4 to 1.9 and an average degree of substitution DS with alkenyl groups of 0.05 to 1.Type: GrantFiled: May 6, 1991Date of Patent: November 24, 1992Assignee: Wolff Walsrode AktiengesellschaftInventor: Jorn Breckwoldt
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Patent number: 5140099Abstract: Water soluble nonionic cellulose ethers are provided, containing mixed alkylphenoxyalkyleneoxy-2-hydroxy propylene groups, having hydrophilic units composed of (a) alkyleneoxy groups of two or three carbon atoms, in a number from zero to about six, selected from --CH.sub.2 CH.sub.2 O--; ##STR1## and --CH.sub.2 CH.sub.2 CH.sub.2 O--; and (b) one 2-hydroxy propylene group, together with hydrophobic units which are alkylphenoxy groups of the formula ##STR2## where R and R.sub.4 are hydrocarbon groups having from about four to about thirty carbon atoms, preferably from about nine to about eighteen carbon atoms; n.sub.Type: GrantFiled: March 12, 1990Date of Patent: August 18, 1992Assignee: Berol Nobel ABInventors: Peter Bostrom, Ingemar Ingvarsson, Kenneth Sundberg
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Patent number: 5093485Abstract: A polysaccharide-based composition, characterized by comprising or essentially consisting of:at least a first component a) excluding galactane constituted by a substituted .beta.-1,4-linked glycan which is dissolvable in water of a certain temperature and which has a molecular weight (Mw) of .gtoreq.5.multidot.10.sup.4 Daltons, preferably.gtoreq.10.sup.5 Daltons, particularly .gtoreq.10.sup.6 Daltons, andat least a second component b), also excluding galactans, constituted by a substituted .beta.-1,4-linked glycan which is more difficult to dissolve than said first component at said temperature, or is agar or a carrageenan;the use of the composiiton above as a:a) means for reducing friction,b) means for facilitating removal of undesired contamination from surfaces, such as graffiti, scrawl, soot etc.Type: GrantFiled: December 29, 1989Date of Patent: March 3, 1992Assignee: Polysaccharide Industries Aktiebolag PsiInventor: Sigfrid Svensson
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Patent number: 5093486Abstract: A modified cellulose and/or chitin for biocompatible dialysis membranes having a structure represented by the formula ##STR1## wherein cell is unmodified cellulose or chitin, in each case without hydroxyl groups, s=3 in the case of cellulose and s=2 in the case of chitin, R' is CH.sub.3 and/or C.sub.2 H.sub.5 and/or C.sub.3 H.sub.7, X denotes specified functional groups, m=0.75 to 2.85, and x=0.005 to 2.10. A process for preparation of the cellulose and/or chitin derivatives is also disclosed.Type: GrantFiled: October 19, 1990Date of Patent: March 3, 1992Assignee: Akzo N.V.Inventor: Michael Diamantoglou
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Patent number: 5093489Abstract: A modified cellulose and/or chitin for biocompatible dialysis membranes having a structure represented by the formula ##STR1## wherein Cell is cellulose or chitin, in each case without hydroxyl groups, s=3 in the case of cellulose and s=2 in the case of chitin, R' is CH.sub.3 and/or C.sub.2 H.sub.5 and/or C.sub.3 H.sub.7, X denotes specified functional groups, R" is H or R, Z corresponds to the following groups of atoms: SR", SO.sub.3 H and salts thereof, SO-R, SONR".sub.2, SO.sub.2 -R, SO.sub.2 NR".sub.2, SO.sub.2 H and salts thereof, F, Cl, Br, I, NR".sub.2, PR".sub.2, PO.sub.3 H.sub.2 and salts thereof, PO.sub.2 H(OR), PO(OR).sub.2, PO.sub.2 HR" and salts thereof, POR"(OR) and POR".sub.2, x+t=0.75 to 2.85, t=0 to 2.85, x=0 to 2.85, and z=0.01 to 0.45. A process for preparation of the cellulose and/or chitin derivatives is also disclosed.Type: GrantFiled: October 19, 1990Date of Patent: March 3, 1992Assignee: Akzo N.V.Inventor: Michael Diamantoglou
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Patent number: 5093488Abstract: A modified cellulose and/or chitin for biocompatible dialysis membranes having a structure represented by the formula ##STR1## wherein cell is cellulose or chitin, in each case without hydroxyl groups, s=3 in the case of cellulose and s=2 in the case of chitin, R' is CH.sub.3 and/or C.sub.2 H.sub.5 and/or C.sub.3 H.sub.7, X denotes specified functional groups, R" is H or R, R"' denotes R, x+t=0.75 to 2.85, t=0 to 2.85, x=0 to 2.85, and r=0 to 1. A process for preparation of the cellulose and/or chitin derivatives is also disclosed.Type: GrantFiled: October 19, 1990Date of Patent: March 3, 1992Assignee: Akzo N.V.Inventor: Michael Diamantoglou
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Patent number: 5013832Abstract: A process for working up water-soluble cellulose derivatives, more especially with flocculation points above 85.degree. C., after removal by condensation of readily volatile constituents of the crude product mixture resulting from an etherification reaction, by suspension of the crude product in hot water and subsequent separation of the suspension and washing liquids, wherein the separation of the suspension and washing liquids is carried out at elevated temperature and under pressure applied to the separator as a whole.Type: GrantFiled: August 17, 1987Date of Patent: May 7, 1991Inventors: Wilfried Raehse, Willi Wuest, Guenther Just
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Patent number: 5008385Abstract: 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: GrantFiled: July 15, 1988Date of Patent: April 16, 1991Assignee: Akzo N.V.Inventor: Michael Diamantoglou
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Patent number: 5004808Abstract: A product comprising a water soluble, high molecular weight aminoalkyl-derivative of hydroxyalkyl-cellulose. The molecular weight of said cellulose is at least 50,000 daltons. One of the methods to obtain the product comprises reacting a hydroxyalkyl cellulose in a basic aqueous medium, in the presence of halogenalkylaminohalide compounds, to obtain a hydroxyalkyl cellulose having an alkylamino group which can be used as such or further reacted in the presence of an amide reducing agent, for instance sodium cyanoborohydride and a carbohydrate residue selected from the group consisting of mono-, di-, oligo-saccharides and starch.Type: GrantFiled: July 7, 1988Date of Patent: April 2, 1991Assignee: Domtar Inc.Inventors: Manssur Yalpani, Magdy M. Abdel-Malik
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Patent number: 5001231Abstract: Carboxymethylhydroxyethyl (CMHEC), starch and guar are preferred polysaccharides providing at least a 1% solution viscosity of 1000 cps at 25 C. An invert emulsion for oil drilling or paper manufacture comprises on a weight percent basis:______________________________________ Diesel, mineral or paraffin oil 40-60 Imidazole surfactant 1-4 Water 0-10 Organophilic clay 0.5-5.Type: GrantFiled: November 20, 1989Date of Patent: March 19, 1991Assignee: Aqualon CompanyInventor: Jose Zapico
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Patent number: 4997935Abstract: A modified cellulose for biocompatible dialysis membranes having a structure represented by the formula ##STR1## wherein cell is cellulose or chitin, in each case without hydroxyl groups, s=3 in the case of cellulose and s=2 in the case of chitin, R' is CH.sub.3 and/or C.sub.2 H.sub.5 and/or C.sub.3 H.sub.7, X denotes specified functional groups, R" is H or R, R"' denotes R, x+t=0.75 to 2.85, t=0 to 2.85, x=0 to 2.85, and r=0 to 1. A process for preparation of the cellulose derivatives is also disclosed.Type: GrantFiled: February 27, 1989Date of Patent: March 5, 1991Assignee: Akzo N.V.Inventor: Michael Diamantoglou
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Patent number: 4992538Abstract: Silated polysaccharides having 0.0005 to 2.0 silyl molar substitution per anhydrosaccharide unit form water resistant films when cast from aqueous solution and dried in the presence of atmospheric carbon dioxide. These films are soluble in aqueous caustic. A preferred water soluble polymer is a cellulose ether with 0.005 to 1.0 silyl substitution.Type: GrantFiled: June 5, 1989Date of Patent: February 12, 1991Assignee: Aqualon CompanyInventor: Arjun C. Sau
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Patent number: 4990608Abstract: Carboxymethylcellulose (CMC) and hydroxyethylcellulose (HEC) are preferred modified polysaccharides providing at least 10% by weight gelatin particles to prevent fluid loss during diaphragm wall construction. A 1% solution of CMC or HEC give a 1000 cps viscosity at 25.degree. C. An oil slurry comprises:______________________________________ Solvent 45 Surfactant 2.5 Water 6 Organophillic clay 1 Modified cellulose 45.Type: GrantFiled: June 7, 1989Date of Patent: February 5, 1991Assignee: Aqualon CompanyInventor: Jose Zapico
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Patent number: 4981960Abstract: A modified cellulose for biocompatible dialysis membranes having a structure represented by the formula ##STR1## wherein Cell is cellulose or chitin, in each case without hydroxyl groups, s=3 in the case of cellulose and s=2 in the case of chitin, R' is CH.sub.3 and/or C.sub.2 H.sub.5 and/or C.sub.3 H.sub.7, X denotes specified functional groups, R" is H or R, Z corresponds to the following groups of atoms: SR", SO.sub.3 H and salts thereof, SO-R, SONR".sub.2, SO.sub.2 -R, SO.sub.2 NR".sub.2, SO.sub.2 H and salts thereof, F, Cl, Br, I, NR".sub.2, PR".sub.2, PO.sub.3 H.sub.2 and salts thereof, PO.sub.2 H(OR), PO(OR).sub.2, PO.sub.2 HR" and salts thereof, POR"(OR) and POR".sub.2, x+t=0.75 to 2.85, t=0 to 2.85, x=0 to 2.85, and z=0.01 to 0.45. A process for preparation of the cellulose derivatives is also disclosed.Type: GrantFiled: February 27, 1989Date of Patent: January 1, 1991Assignee: Akzo N.V.Inventor: Michael Diamantoglou
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Patent number: 4981959Abstract: A modified cellulose for biocompatible dialysis membranes having a structure represented by the formula ##STR1## wherein cell is unmodified cellulose or chitin, in each case without hydroxyl groups, s=3 in the case of cellulose and s=2 in the case of chitin, R' is CH.sub.3 and/or C.sub.2 H.sub.5 and/or C.sub.3 H.sub.7, X denotes specified functional groups, m=0.75 to 2.85, and x=0.005 to 2.10. A process for preparation of the cellulose derivatives is also disclosed.Type: GrantFiled: February 27, 1989Date of Patent: January 1, 1991Assignee: Akzo N.V.Inventor: Michael Diamantoglou
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Patent number: 4942128Abstract: The present invention involves a method of producing cellulose. This method comprises inoculating a quantity of nutrient medium comprising a polysaccharide derivative such as carboxymethylcellulose (CMC) with a cellulose-producing microorganism. The inoculated medium is then aerobically incubated to facilitate the production of cellulose. The step of substantially drying the cellulose may be added for certain products. Substantially dried cellulose resulting from this procedure is highly absorbent, tending to retain its absorbent properties during repeated wetting and drying, and is usable where such absorbency is desired.A subject of the present invention is a composition of matter consisting essentially of such cellulose in a native or substantially dried form. Microbial cellulose produced in the presence of carboxymethyl cellulose may be substantially dried by many means known to those skilled in the art. This drying may be, for example, by washing with a non-aqueous hydrophilic solvent or by air-drying.Type: GrantFiled: March 6, 1987Date of Patent: July 17, 1990Assignee: Board of Regents, the University of Texas SystemInventor: R. Malcolm Brown, Jr.
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Patent number: 4940785Abstract: A method for preparing cellulose ethers containing tertiary or quaternary nitrogen by reacting alkylene epoxides with cellulose or its derivatives in an alkaline medium in the presence of water. Alkylene epoxides of the formulas ##STR1## or mixtures thereof, in which n=1, 2 or 3, R.sup.1, R.sup.2 and R.sup.3 correspond to the same or different alkyl groups with 1 to 18 carbon atoms or R.sup.1 corresponds to the benzyl group or --C.sub.2 H.sub.4 OH and X is chloride, bromide, sulfate or acetate are used as cationization agents.Type: GrantFiled: October 4, 1988Date of Patent: July 10, 1990Assignee: Degussa AktiengesellschaftInventors: Reinhard Stober, Dietmar Bischoff, Michael Huss