Stabilizing Patents (Class 536/81)
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Patent number: 11685793Abstract: One embodiment shows a method for producing porous cellulose particles, including: (a) dissolving cellulose diacetate into a solvent to prepare a cellulose diacetate solution; (b) dispersing the cellulose diacetate solution into a medium immiscible with the cellulose diacetate solution to obtain a dispersed system; (c) cooling the dispersed system; (d) adding a poor solvent to the cooled dispersed system to precipitate cellulose diacetate particles; and (e) saponifying the cellulose diacetate particles.Type: GrantFiled: August 13, 2014Date of Patent: June 27, 2023Assignee: JNC CORPORATIONInventors: Toru Kurabayashi, Shigeyuki Aoyama, Akihiro Uchida
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Patent number: 10889654Abstract: The invention concerns a process for the manufacture of an acylated polysaccharide which comprises. (a) reacting a polysaccharide with an acylating agent to produce an acylated polysaccharide and (b) washing the acylated polysaccharide with water containing from 0.05 to 15 mg/l Ca2+-ions (c) recovering the washed acylated polysaccharide and an aqueous phase containing carboxylic acid from step (b).Type: GrantFiled: October 8, 2014Date of Patent: January 12, 2021Assignee: SOLVAY ACETOW GmbHInventors: Andreas Hummel, Hans-Juergen Ehret
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Patent number: 7671193Abstract: A process for adjusting an intermolecular or intermolecular degree of acetyl substitution of cellulose acetate is disclosed. The process comprises ripening cellulose acetate in the presence of a catalyst, an acetyl donor, and water or an alcohol. The amount of water and the alcohol is in the range of 0.1 to 10 mol % based on the amount of the acetyl donor.Type: GrantFiled: March 14, 2002Date of Patent: March 2, 2010Assignee: Daicel Chemical Industries, Ltd.Inventors: Tohru Shibata, Yuichiro Shuto, Masaaki Ito, Tanemi Asai
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Patent number: 6531592Abstract: The subject of the invention is a process for modifying amylaceous (starchy) materials comprising a stage of chemical fluidification and a stage of stabilization, simultaneous or not simultaneous, these two stages being performed in the dry phase and by the use of a plycarboxylic organic acid. The acid can be chosen particularly from among citric acid, adipic acid, azelaic acid and their mixtures. The process is advantageously performed at a temperature between 90° C. and 170° C., at a pH below 4 and during a total period between 3 minutes and 8 hours. The starchy material subjected to fluidification and stabilization can be cationic.Type: GrantFiled: May 1, 2000Date of Patent: March 11, 2003Assignee: Roquette FreresInventors: Patrick Fuertes, Anne Lambin, Jean-Louis Dreux
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Patent number: 5773227Abstract: This invention describes bifunctional polysaccharides conjugated to both a chelating group suitable for the selective complexation of metal cations, and a targeting peptide specific for a cellular substructure. These bifunctional polysaccharides are primarily useful for the regulation, detection and quantification of metal ion levels, such as Ca.sup.2+, Mg.sup.2+, Na.sup.+, K.sup.+, or Li.sup.+, in specific cellular structures. Localization within the cellular structure is accomplished by the targeting peptide, whereupon the large, water-soluble polysaccharide prevents diffusion of the chelating group from the targeted site. When the target cell structure is the nucleus of a fertilized egg cell, the polysaccharide-chelator conjugate remains sequestered within the nucleus until the breakdown of the nuclear envelope, whereupon the reagent becomes sequestered into both daughter nuclei. This means of tracking daughter cells is practical even through several cell divisions.Type: GrantFiled: June 23, 1993Date of Patent: June 30, 1998Assignee: Molecular Probes, Inc.Inventors: Michael A. Kuhn, Tobias Meyer, Nancy L. Allbritton
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Patent number: 5294703Abstract: Provided is a novel improved process for the preparation of .alpha.-D-cellobiose octaacetate via the acetylative degradation of cellulose or cellulose acetate. The title compound is provided in high yield and quality in a facile one-pot process, amenable to large-scale synthesis.Type: GrantFiled: April 7, 1993Date of Patent: March 15, 1994Assignee: Eastman Kodak CompanyInventors: John A. Hyatt, Tony L. Sander, D. Mark Naylor, Bobby L. Bernard
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Patent number: 5142034Abstract: Process for reducing the degree of substitution of cellulose esters employing Lewis acids as solvolysis promoters is disclosed. Novel low degree of substitution cellulose esters produced by the invention process are also described.Type: GrantFiled: April 16, 1990Date of Patent: August 25, 1992Assignee: Eastman Kodak CompanyInventors: Michael Bellas, Charles M. Buchanan, Kevin J. Edgar, Ted C. Germroth, Alan K. Wilson
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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: 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: 4988617Abstract: Assay for determing the nucleic acid sequence in a region of a nucleic acid test substance having a known normal sequence and a known possible mutation at at least one target nucleotide position. Oligonucleotide probes are selected to anneal to immediately adjacent segments of a substantially complementary test DNA or RNA molecule. The target probe has an end region wherein one of the end region nucleotides is complementary to the normal or abnormal nucleotide at the corresponding target nucleotide position. A linking agent is added under conditions such that when the target nucleotide is correctly base paired, the probes are covalently joined and if not correctly base paired, the probes are incapable of being covalently joined under such conditions. The presence or absence of linking is detected as an indication of the sequence of the target nucleotide.Type: GrantFiled: March 25, 1988Date of Patent: January 29, 1991Assignee: California Institute of TechnologyInventors: Ulf Landegren, Leroy Hood
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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: 4831068Abstract: A process is described for improving the photochemical stability of dyeings on polyester fibre materials by means of UV absorbers of the formula ##STR1## in which R is lower alkyl, lower alkoxy, halogen or hydroxyl, R.sub.1 and R.sub.2 independently of one another alkyl which is substituted by hydroxyl, lower alkoxy, lower alkylthio, amino, monoalkylamino or dialkylamino, phenyl, phenyl which is substituted by chlorine, lower alkyl or lower alkoxy, or o-hydroxyphenyl, and n is 0, 1 or 2.Type: GrantFiled: February 17, 1988Date of Patent: May 16, 1989Assignee: Ciba-Geigy CorporationInventors: Gerhard Reinert, Kurt Burdeska
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Patent number: 4461892Abstract: A process for preparing porous, spherical cellulose particles which comprises suspending a cellulose organic ester solution dissolved in a chlorinated hydrocarbon solvent into an aqueous medium to form droplets of the solution, evaporating the chlorinated hydrocarbon solvent in the droplets to form cellulose organic ester spherical particles, and saponifying the cellulose organic ester spherical particles. In the aforesaid process, an acid or alkaki is added and mixed with the cellulose organic ester solution prior to suspending the cellulose organic ester solution into the aqueous medium to control the porosity of the porous, spherical cellulose particles with high reproducibility.Type: GrantFiled: February 23, 1983Date of Patent: July 24, 1984Assignee: Chisso CorporationInventors: Masahiko Nishikawa, Hiroaki Ishibashi, Hidenori Furukawa
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Patent number: 4458065Abstract: Apramycin derivatives substituted at the 7'-amino group with a methyl, ethyl, n-propyl or n-butyl substituent are broad spectrum antibiotics. Also claimed are intermediates in the synthesis of these 7'-N-alkylapramycin derivatives.Type: GrantFiled: February 17, 1983Date of Patent: July 3, 1984Assignee: Eli Lilly and CompanyInventor: Herbert A. Kirst
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Patent number: 4390691Abstract: A process for preparing porous, spherical cellulose particles which comprises suspending a cellulose organic ester solution dissolved in a chlorinated hydrocarbon solvent into an aqueous medium to form droplets of the solution, evaporating the chlorinated hydrocarbon solvent in the droplets to form cellulose organic ester spherical particles, and saponifying the cellulose organic ester spherical particles. In the aforesaid process, an acid or alkali is added and mixed with the cellulose organic ester solution prior to suspending the cellulose organic ester solution into the aqueous medium to control the porosity of the porous, spherical cellulose particles with high reproducibility.Type: GrantFiled: July 21, 1981Date of Patent: June 28, 1983Assignee: Chisso CorporationInventors: Masahiko Nishikawa, Hiroaki Ishibashi, Hidenori Furukawa