Mixed Ethers Patents (Class 536/90)
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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: 5670137Abstract: The invention concerns a dentifrice composition containing, in an anhydrous medium which comprises glycerin, at least one hydroxyethylcellulose having at least one hydrophobic chain, and at least one pyrogenetic silica with an average primary particle size of less than 40 nm; as well as its use in bucco-dental hygiene.Type: GrantFiled: December 12, 1994Date of Patent: September 23, 1997Assignee: L'OrealInventor: Jean Marc Ascione
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Patent number: 5612321Abstract: Grafted polysaccharide compositions comprising polysaccharides grafted with antioxidants on at least one hydroxyl group of the polysaccharide. The use of antioxidant grafted polysaccharides or antioxidant grafted crosslinked polysaccharides as a treatment for arthritis, as a drug delivery vehicle, to reduce the incidence of post-operative adhesion formation, to promote the healing of chronic wounds and ulcers, and as a component of cosmetic formulations.Type: GrantFiled: June 22, 1995Date of Patent: March 18, 1997Assignee: Hercules IncorporatedInventor: Tuyen T. Nguyen
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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: 5583214Abstract: 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: GrantFiled: June 5, 1995Date of Patent: December 10, 1996Assignee: Union Carbide Chemicals & Plastics Technology CorporationInventor: Emmett M. Partain, III
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Patent number: 5466390Abstract: Substantially non-aqueous liquid cleaning compositions comprise a non-aqueous liquid phase, which liquid phase comprises an alkylpolyglucoside partial ether. Specific novel alkylpolyglucoside partial ether are also claimed.Type: GrantFiled: July 7, 1993Date of Patent: November 14, 1995Assignee: Lever Brothers CompanyInventors: Mark P. Houghton, Charles C. Verburg
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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: 5455341Abstract: The invention relates to certain highly substituted carboxymethyl sulfoethyl cellulose ethers (CMSEC), to a simplified and economic process for their production and to their use as thickeners in textile printing.Type: GrantFiled: December 1, 1993Date of Patent: October 3, 1995Assignee: Wolff Walsrode AktiengesellschaftInventors: Rene Kiesewetter, Reinhard Kniewske, Eugen Reinhardt, Klaus Szablikowski
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Patent number: 5442054Abstract: The present invention relates to sulphoalkylcellulose derivatives, in particular sulphoethylcellulose, with a degree of substitution by sulphoethyl groups of 1.2 to 2.0 using a one- to three-step, preferably two-step process and the use of the sulphoalkyl-cellulose derivatives as thickening agents or rheology improvers in textile printing.Type: GrantFiled: December 14, 1993Date of Patent: August 15, 1995Assignee: Wolff Walsrode AktiengesellschaftInventors: Rene Kiesewetter, Reinhard Kniewske, Eugen Reinhardt, Klaus Szablikowski
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Patent number: 5426182Abstract: Polysaccharides, including hydroxyethyl cellulose, having complex hydrophobic group substitution, provide latex compositions, such as paints, with improved rheology and stability. Improved processes for producing such polysaccharides are also provided.Type: GrantFiled: May 29, 1992Date of Patent: June 20, 1995Assignee: Union Carbide Chemical & Plastics Technology CorporationInventors: Richard D. Jenkins, David R. Bassett, Gregory D. Shay
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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: 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: 5278304Abstract: The invention relates to water-soluble sulfoethyl cellulose ethers, more particularly methyl sulfoethyl cellulose ether (MSEC), of very high solution quality, to a process for its production and to the use of these products as thickeners, dispersants or binders.Type: GrantFiled: April 20, 1992Date of Patent: January 11, 1994Assignee: Bayer AktiengesellschaftInventors: Reinhard Kniewske, Rene Kiesewetter, Klaus Szablikowski
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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: 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: 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: 5145910Abstract: New ketocarboxylated polymers which comprise an ester of a ketodiacid precursor, and part of all of the hydroxy or thiol groups of a polymer having one or more pendant hydroxy or thiol groups, are useful as adhesives, coatings, membranes and the like.Type: GrantFiled: July 27, 1990Date of Patent: September 8, 1992Assignee: Shell Oil CompanyInventor: Pen-Chung Wang
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Patent number: 5124445Abstract: Cellulose ethers are disclosed which have sufficient nonionic substitution to render them water soluble and which are further modified with a C.sub.10 to C.sub.24 long chain alkylaryl group in an amount between 0.2% by weight and the amount which makes them less than 1% by weight soluble in water. Hydroxyethylcellulose is a preferred water soluble cellulose ether for modification according to the invention. These products exhibit substantially improved viscosifying effects compared to their unmodified cellulose ether counterparts, and provide good leveling and sag resistance in latex paints. Preferred alkylaryl groups are nonylphenyl, dodecylphenyl, and dinonylphenyl. Included are cellulose ethers with spacer groups of various lengths between the alkylaryl group and the connecting group to the cellulose molecule.Type: GrantFiled: May 17, 1991Date of Patent: June 23, 1992Assignee: Aqualon CompanyInventors: Ernst K. Just, Thomas G. Majewicz, Arjun C. Sau
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Patent number: 5120838Abstract: Cellulose ethers are disclosed which have sufficient nonionic substitution to render them water soluble and which are further modified with a C.sub.10 to C.sub.24 long chain alkylaryl group in an amount between 0.2% by weight and the amount which makes them less then 1% by weight soluble in water. Hydroxyethylcellulose is a preferred water soluble cellulose ether for modification according to the invention. These products exhibit substantially improved viscosifying effects compared to their unmodified cellulose ether counterparts, and provide good leveling and sag resistance in latex paints. Preferred alkylaryl groups are nonylphenyl, dodecylphenyl, and dinonylphenyl. Included are cellulose ethers with spacer groups of various lengths between the alkylaryl group and the connecting group to the cellulose molecule.Type: GrantFiled: October 30, 1989Date of Patent: June 9, 1992Assignee: Aqualon CompanyInventors: Ernst K. Just, Thomas G. Majewicz, Arjun C. Sau
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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: 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: 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: 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: 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: 5001232Abstract: Improved water soluble carboxymethylsulphoethyl celluloses may be obtained by suspending cellulose, adding compounds which transfer sulphoalkyl and carboxymethyl and then etherifying after alkalization.Type: GrantFiled: December 9, 1988Date of Patent: March 19, 1991Assignee: Wolff Walsrode AGInventors: Dieter Herzog, Klaus Balser, Klaus Szablikowski
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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: 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: 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: 4976885Abstract: Liquid preparations for cleaning hard surfaces based on anionic surfactants either individually or in combination with nonionic surfactants or amphoteric surfactants, or nonionic surfactants either individually or in combination with cationic surfactants, solubilizers and, optionally, builders, dyes, perfumes and preservatives, containing an addition of polymers, namely cellulose ethers.Type: GrantFiled: August 12, 1988Date of Patent: December 11, 1990Assignee: Henkel Kommanditgesellschaft auf AktienInventors: Klaus-Dieter Wisotzki, Klaus Schumann, Konard Engelskirchen, Brigitte Hase
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Patent number: 4972007Abstract: Cellulose derivatives which are substituted in a specified manner by both carboxyalkyl groups and sulphoalkyl groups which are suitable in drilling fluids.Type: GrantFiled: December 9, 1988Date of Patent: November 20, 1990Assignee: Wolff Walsrode AGInventors: Dieter Herzog, Bernd Schriewer
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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
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Patent number: 4904772Abstract: Water-soluble, cellulose ether polymers having (a) at least one substituent selected from the group consisting of hydroxyethyl, hydroxypropyl, and methyl radicals and (b) two or more hydrophobic radicals having 6 to 20 carbon atoms selected from the group consisting of long chain alkyl, alphahydroxyalkyl, urethane, acyl and 3-alkoxy-2-hydroxypropyl, wherein one of the hydrophobic radicals has a carbon chain length that is at least two carbon atoms longer than that of the other of the hydrophobic radials and the hydrophobic radicals are contained in a total amount of between about 0.2 weight percent and an amount such that the cellulose ethers are less than 1% by weight soluble in water, and aqueous protective coatings, such as latex paints, containing the same are disclosed.Type: GrantFiled: October 3, 1988Date of Patent: February 27, 1990Assignee: Aqualon CompanyInventor: Arjun C. Sau
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Patent number: 4892589Abstract: A novel cementing composition comprising a hydraulic cement and, as a fluid loss agent, water-soluble, nonionic hydrophobically modified hydroxyethyl cellulose, are disclosed. Preferably, the cementing composition further comprises water-soluble, nonionic hydroxyethyl cellulose as a second fluid loss agent. A novel aqueous slurry containing the cementing composition, a novel process of using the aqueous slurry to fill an annulus between a borehole wall and casing, and a novel composition of matter comprising specified amounts of water-soluble, nonionic hydrophobically modified hydroxyethyl cellulose and water-soluble, nonionic hydroxyethyl cellulose, are also disclosed.Type: GrantFiled: August 16, 1988Date of Patent: January 9, 1990Assignee: Aqualon CompanyInventors: William J. Kirkland, Carl A. Lukach, William C. McLachlan
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Patent number: 4663159Abstract: Water-soluble, cationic polysaccharides, including quaternary nitrogen-containing cellulose ethers, containing hydrophobic substitution, are substantially water-soluble; provide aqueous solutions having enhanced viscosity, foaming and preferably improved surface properties; and possess utility in personal care, emulsions and cleansers.Type: GrantFiled: February 1, 1985Date of Patent: May 5, 1987Assignee: Union Carbide CorporationInventors: George L. Brode, II, Russell L. Kreeger, Errol D. Goddard, Frederick M. Merritt, II, David B. Braun
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Patent number: 4661589Abstract: Alkylene oxide is added as a vapor in preparing C.sub.2 or higher hydroxyalkylcellulose ethers and hydroxyalkylalkylcellulose ethers by continuously adding the reagents to alkali cellulose at elevated temperatures.Type: GrantFiled: July 2, 1985Date of Patent: April 28, 1987Assignee: The Dow Chemical CompanyInventors: Glen L. Adams, Christopher D. Messelt
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Patent number: 4650863Abstract: The process for preparing water-soluble mixed cellulose ethers proceeds in the following steps:(a) alkalization of the cellulose,(b) etherification of the alkali cellulose in the presence of a base, using at least one etherifying agent which requires, for the reaction with cellulose, a catalytic and sub-stoichiometric quantity of a base, and(c) after increasing the quantity of base, further etherification of the cellulose ether so prepared, using at least one etherifying agent which requires, for the reaction with cellulose, an at least stoichiometric quantity of a base or a catalytic and sub-stoichiometric quantity of a base, increased over the quantity used in (a),with at least one inert organic solvent being used as a dispersing auxiliary in at least one of the steps and water being present in all steps. The organic solvent used is dimethyl ether, which either is used alone or in a mixture with dimethoxyethane, an alkanol, an alkanediol and/or an alkoxyalkanol.Type: GrantFiled: May 10, 1985Date of Patent: March 17, 1987Assignee: Hoechst AktiengesellschaftInventors: Utz-Hellmuth Felcht, Gerhard Buchberger
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Patent number: 4579942Abstract: Water-soluble polysaccharides, including cellulose ethers, containing pendent vicinal dihydroxy structure capable of cis geometry, which upon crosslinking with a polyvalent metal, have shear-thermal stability characteristics of at least about 30 at 250.degree. F., are useful in oilfield applications.Type: GrantFiled: September 26, 1984Date of Patent: April 1, 1986Assignee: Union Carbide CorporationInventors: George L. Brode, James P. Stanley, Emmett M. Partain, III
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Patent number: RE34904Abstract: Cellulose ethers are disclosed which have sufficient nonionic substitution to render them water soluble and which are further modified with a C.sub.10 to C.sub.24 long chain alkylaryl group in an amount between 0.2% by weight and the amount which makes them less than 1% by weight soluble in water. Hydroxyethylcellulose is a preferred water soluble cellulose ether for modification according to the invention. These products exhibit substantially improved viscosifying effects compared to their unmodified cellulose ether counterparts, and provide good leveling and sag resistance in latex paints. Preferred alkylaryl groups are nonylphenyl, dodecylphenyl, and dinonylphenyl. Included are cellulose ethers with spacer groups of various lengths between the alkylaryl group and the connecting group to the cellulose molecule.Type: GrantFiled: July 8, 1993Date of Patent: April 11, 1995Assignee: Hercules IncorporatedInventors: Ernst K. Just, Thomas G. Majewicz, Arjun C. Sau