Ether-esters Patents (Class 536/66)
-
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
-
Patent number: 4906744Abstract: A method for the production of new derivatives of watersoluble cellulose ethers by the reaction of 100 parts by weight of a water-soluble cellulose ether with 3 to 30 parts by weight of C.sub.8-18 alkyl(ene) succinic acid anhydride, in the absence of water and under neutral or acid conditions at elevated temperature, until, in analytically detectable terms, 1 to 8% by weight, based on the cellulose ether, of alk(en)yl succinic acid has reacted with the cellulose molecule; the products of the method; and their use as thickners for aqueous surfactant solutions, dye dispersions, and for hydraulically setting building materials or their use as protective colloids or emulsifiers in the suspension polymerization of water-insoluble monomers in aqueous phase.Type: GrantFiled: February 3, 1989Date of Patent: March 6, 1990Assignee: Henkel CorporationInventors: Manfred Peuscher, Konrad Engelskirchen, Eberhard Gruenberger
-
Patent number: 4897473Abstract: This invention produces higher homologs, i.e., differing by at least a --CH.sub.2 -unit, of carbonyloxy-containing compounds by treating the carbonyloxy-containing compounds with carbon monoxide and hydrogen in the presence of a ruthenium-containing compound, a proton donor, an iodide promoter, and optionally, a manganese-containing compound.Type: GrantFiled: May 1, 1981Date of Patent: January 30, 1990Assignee: Union Carbide Chemicals and Plastics Company Inc.Inventor: Bernard D. Dombek
-
Patent number: 4839230Abstract: The present invention relates to a grafted cellulose ester prepared by reacting a cellulose ester containing residual hydroxyl groups with an acrylic based compound and m-isopropenyl-.alpha.,.alpha.'-dimethylbenzyl isocyanate. The grafted cellulose ester is a urethane-containing product having pendant (meth)acrylate and .alpha.-methylstyrene moieties. The grafted cellulose ester is readily self-polymerizable in the presence of a photoinitiator upon exposure to ultraviolet radiation. It does not require the presence of vinyl monomers to become crosslinked. The grafted cellulose ester is useful as a protective/decorative coating for wood, metal, plastics, and other substrates.Type: GrantFiled: January 25, 1988Date of Patent: June 13, 1989Assignee: Eastman Kodak CompanyInventor: Phillip M. Cook
-
Patent number: 4826970Abstract: New anianic, water-soluble cellulose ether derivatives, in particular, carboxymethyl hydrophobically modified hydroxyethylcellulose (CMHMHEC), which are useful as thickeners in aqueous solutions, e.g., water-based protective coating compositions such as latex paints, as well as aqueous solutions, including water-based protective coating compositions containing these ternary cellulose ethers as thickeners and protective coloids, are disclosed. The cellulose ether derivatives are characterized in that they have a Brookfield LVF Viscosity of about 5 centipoise to about 60,000 centipoise in a 1 weight % solution.Type: GrantFiled: September 17, 1987Date of Patent: May 2, 1989Assignee: Hercules IncorporatedInventors: Albert R. Reid, Richard D. Royce, Jr.
-
Patent number: 4749414Abstract: The invention relates to a composition useful for producing a modifying adherent layer on a passive polymeric material, said composition comprising (A) a fluorinated ester substituted alkoxy cellulose having, on the average, between about 1.0 to 2.99 of the three reactive hydroxyl groups of each glucose unit present as alkoxy groups, and the remainder of the reactive hydroxyl groups of each glucose unit present as a fluoroester group of the formula: ##STR1## wherein R.sub.f is branched perfluoroalkyl comprising 3 to 20 carbon atoms; or --(CF.sub.2).sub.n CF.sub.2 --Q, wherein Q is hydrogen of fluorine; n is an integer from 1 to 19; or ##STR2## wherein X is selected from the group consisting of --F, --CF.sub.3 and --CF.sub.2 Cl, Y is --F, --Cl, --CF.sub.2 Cl or perfluoroalkyl having from 1 to 10 carbon atoms, Z is --F, --Cl, --CF.sub.3 or CF.sub.2 Cl, and m is an integer from 1 to 12; and (B) an organic solvent.Type: GrantFiled: December 16, 1986Date of Patent: June 7, 1988Assignee: The Dow Chemical CompanyInventors: Marinda L. Wu, John F. Voeks
-
Patent number: 4543410Abstract: Absorbent, coherent, flexible structures in the form of fibrous webs and porous sponges comprising water-insoluble, ring oxidized cellulosic bases consisting of water-insoluble cellulose ethers, cellulose mixed ethers ring oxidized forms of these cellulose, cellulose ether mixed esters and mixtures of the bases. The cellulose bases have a DS of between about 0.05 and about 0.35. Upon application of the structures to the body and wet with aqueous body liquids, sharp edges and protruding fibers and fibrils or hairs become highly swollen or may dissolve thereby eliminating irritation. The ring oxidized forms of the cellulose bases contain between about 2% and about 52% added carboxyl groups. The structures may have hemostatic properties and the structure may include uniformly dispersed therein chitin and/or starch derivatives or contain starch or gelatin compounds to enhance the hemostatic efficacy.Type: GrantFiled: June 21, 1982Date of Patent: September 24, 1985Assignee: Morca, Inc.Inventor: Cruz, Jr., Mamerto M.
-
Patent number: 4520192Abstract: A carboxyalkyl acetyl cellulose having a degree of substitution (DS) by the carboxyalkyl group per anhydroglucose unit of 0.2-2.5 and a degree of substitution (DS) by acetyl group per anhydroglucose unit of 0.5-2.8, the alkyl in the carboxyalkyl group being a C.sub.1-3 alkyl, and a salt thereof, and a process for the preparation of carboxyalkyl acetyl celluloses by acetylating an alkali metal salt of a carboxyalkyl cellulose having a degree of substitution by the carboxyalkyl group per anhydroglucose unit of 0.2-2.5, after converting it into the acid-form by treatment with an aqueous acid solution, with acetic anhydride in the presence of catalyst to obtain a carboxyalkyl acetyl cellulose having a degree of substitution by the carboxyalkyl group per anhydroglucose unit of 0.2-2.5 and a degree of substitution by acetyl group per anhydroglucose unit of 0.5-2.8, and if needed converting it into the corresponding salt.Type: GrantFiled: July 3, 1984Date of Patent: May 28, 1985Assignee: Daicel Chemical Industries Ltd.Inventor: Hajime Namikoshi
-
Patent number: 4504656Abstract: New esterified carboxymethyl celluloses in which DS by carboxymethyl group per anhydroglucose unit is 2.0 or more, the ester group is a hydrocarbon residue having 1-8 carbon atoms such as methyl, ethyl, n-octyl or benzyl group, DS by esterified carboxymethyl group per anhydroglucose unit is 1.50 or more and the remaining unsubstituted carboxymethyl groups are in the form of free acid and which are soluble in various polar or non-polar organic solvents and are useful as ingredients of paints of enteric coating materials.Type: GrantFiled: August 30, 1983Date of Patent: March 12, 1985Assignee: Daicel Chemical Industries, Ltd.Inventor: Takeo Omiya
-
Patent number: 4365060Abstract: The invention provides a novel enterosoluble capsule for containing a medicament, which is shaped with a hitherto not used novel cellulose derivative. The cellulose derivative is a mixed ester of an alkyl-, hydroxyalkyl- or hydroxyalkyl alkylcellulose esterified with succinyl anhydride and an aliphatic monocarboxylic acid anhydride. The enterosoluble capsules have excellent enterosolubility behavior as well as sufficient pliability even without the addition of a plasticizer which is almost indispensable in the prior art materials. The cellulose derivative can be shaped into capsules not only by the conventional dipping method but also by the plastic deformation at an elevated temperature under pressure such as compression molding, vacuum forming, matchedmold forming and the like.Type: GrantFiled: April 15, 1980Date of Patent: December 21, 1982Assignee: Shin-Etsu Chemical Co. Ltd.Inventors: Yoshiro Onda, Hiroaki Muto, Kazumasa Maruyama
-
Patent number: 4362868Abstract: Plasticized cellulose polymers comprise a base polymer having a chain of .beta.-anhydroglucose units joined by ether linkages and having ether substituents, with at least one of the units being additionally substituted, by esterification of at least one hydroxyl group, by at least one ester group, which contains at least two carbon atoms and is chemically unreactive.Preferably the ester group contains four or more, most preferably five, carbon atoms. The carbon chains of the ester groups may be straight or branched.These internally plasticized celluloses may be prepared by, for example, reacting the base polymer with a carboxylic acid in xylene or with an acid chloride or anhydride in pyridine. They are useful in particular as inhibitor coatings for rocket motor propellants and in general wherever cellulose polymers are employed.Type: GrantFiled: September 19, 1980Date of Patent: December 7, 1982Assignee: The Secretary of State for Defence in Her Britannic Majesty's Government of the United Kingdom of Great Britian and Northern IrelandInventors: Michael Burnup, Gerard F. Hayes, Norman C. Paul
-
Patent number: 4329383Abstract: Non-thrombogenic material comprising a base polymer treated with heparin, the improvement in which the heparin is covalently bonded with the base polymer through only one acetal bond or hemiacetal bond at each bonding site between the heparin and the base polymer.Type: GrantFiled: July 21, 1980Date of Patent: May 11, 1982Assignee: Nippon Zeon Co., Ltd.Inventor: Yasushi Joh
-
Patent number: 4321261Abstract: A contact lens solution is provided for wetting, soaking and lubricating of hard contact lenses, particularly those carrying an ionic charge. The solution contains an ionic polymer of cationic or anionic charge that interacts with an oppositely charged surface of a contact lens forming an interfacial polyelectrolyte complex. This polyelectrolyte complex provides increased, long lasting lens wettability leading to a cushioning and lubricating effect with the eyelid and the cornea.Type: GrantFiled: June 25, 1979Date of Patent: March 23, 1982Assignee: Polymer Technology CorporationInventors: Edward J. Ellis, Joseph C. Salamone
-
Patent number: 4305823Abstract: Polymers from the group consisting of cellulose and its ester and ether derivatives, of polyvinyl alcohol and its ester derivatives, copolymers with vinyl esters and homopolymers and copolymers of acrylates and methacrylates are modified with monofunctional or difunctional cyclic .beta.-ketonic acids or their esters, in particular with succinylsuccinic acid or its ester derivatives. The modified polymers are particularly suitable for obtaining semi-permeable membranes for osmotic separation methods.Type: GrantFiled: July 25, 1980Date of Patent: December 15, 1981Assignee: Ciba-Geigy CorporationInventors: Hans Batzer, Joel Sinnreich
-
Patent number: 4294731Abstract: 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: GrantFiled: August 13, 1980Date of Patent: October 13, 1981Assignee: Akzona IncorporatedInventor: Thomas C. Allen
-
Patent number: 4272526Abstract: The present invention relates to a chloral derivative having the general formula ##STR1## in which Y' is a polysaccharide consisting of a chain of anhydroglucose, modified anhydroglucose or uronic acid units as substituent group and in which R is selected from --H, --COCH.sub.2 OH, --[(CH.sub.2).sub.n 0].sub..chi. --H in which n is 2 to 5 and .chi. is 1 to 7; --CH.sub.2 OSO.sub.2 X' or --CH.sub.2 COOX' in which X' is NH.sub.4 or a single equivalent of a non-toxic metallic cation, --(CH.sub.2).sub.n H where n is 1 to 7, --(CH.sub.2).sub.n (OH).sub..chi. Y where Y is --H or --CH.sub.3 n is 1 to 7, .chi. is 1 to 12 and the --OH groups are attached to any or all of the carbon atoms by substitution and wherein when Y.sup.1 is a chain of unmodified anhydroglucose units, these units have the following configurations:.alpha.-D-glucopyranosyl units having a predominantly 1-4 linkage.beta.-D-glucopyranosyl units having a predominantly 1-4 linkage and/or.beta.Type: GrantFiled: May 8, 1979Date of Patent: June 9, 1981Assignee: Macarthys Pharmaceuticals LimitedInventors: David E. Simpkins, John B. O. Taylor
-
Patent number: 4249000Abstract: Polymers from the group consisting of cellulose and its ester and ether derivatives, of polyvinyl alcohol and its ester derivatives, polymers with vinyl esters and homopolymers and copolymers of acrylates and methacrylates are modified with monofunctional or difunctional cyclic .beta.-ketonic acids or their esters, in particular with succinylsuccinic acid or its ester derivatives. The modified polymers are particularly suitable for obtaining semi-permeable membranes for osmotic separation methods.Type: GrantFiled: February 21, 1979Date of Patent: February 3, 1981Assignee: Ciba-Geigy CorporationInventors: Hans Batzer, Joel Sinnreich
-
Patent number: 4226981Abstract: A novel cellulose derivative provided in this invention is a mixed ester of an alkoxy or hydroxyalkoxy substituted cellulose ether, prepared by the esterification reaction of the ether with succinic anhydride and an anhydride of an aliphatic monocarboxylic acid. The cellulose derivatives are advantageous because of their capability of producing enteric coatings having sufficient flexibility without the use of a plasticizer as well as by their chemical and physical stability against moisture, and also by easy purification after completion of the esterification reaction. The coatings produced from the derivatives have a similar chemical and physical stability. The cellulose derivatives are useful for the enteric coating of pharmaceutical dosage forms and also for providing halation-preventing layers on photographic films.Type: GrantFiled: September 20, 1978Date of Patent: October 7, 1980Assignee: Shin-Etsu Chemical Co., Ltd.Inventors: Yoshiro Onda, Hiroaki Muto, Kazumasa Maruyama
-
Patent number: 4097667Abstract: Disclosed is a process for the chemical modification of a water-soluble cellulose ether, which comprises reacting the ether with a chloroformic acid ester in an aqueous organic medium containing alkali hydroxide, whereby the cellulose ether is rendered at least partially insoluble in water. The modified cellulose ether may be easily dispersed in water and redissolved to form a smooth solution of the original water-soluble ether by adding sufficient alkali to the dispersion to reuse its pH to at least about 11, preferably to about 12.Type: GrantFiled: December 16, 1976Date of Patent: June 27, 1978Assignee: Hoechst AktiengesellschaftInventors: Arno Holst, Michael Kostrzewa
-
Patent number: 4013820Abstract: Known polymers of a defined class are converted into a universally useable tableting ingredient that provides controlled release of a drug from tablets made with this material. The new material is made in a rapidly stirred, nonaqueous solvent in a one-step process.Type: GrantFiled: November 7, 1974Date of Patent: March 22, 1977Assignee: Abbott LaboratoriesInventors: Bahram Farhadieh, James Maynard Berdahl
-
Patent number: 4005070Abstract: A novel substance, viz., the salt of .beta.-diethylaminoethyl p-aminobenzoate with celluloseglycolic acid has the following general formula: ##STR1## WHERE X STANDS FOR THE DEGREE OF SUBSTITUTION RANGING FROM 75 TO 100n stands for the degree of polymerization ranging from 30 to 120.A method of producing said compound comprises reacting .beta.-diethylaminoethyl p-aminobenzoate with celluloseglycolic acid in an aqueous medium, whereupon the final product is isolated.The aforementioned compound, viz., the salt of .beta.-diethylaminoethyl p-aminobenzoate with celluloseglycolic acid is the active principle of a local anesthetic drug. The proposed drug finds application in medical practive as an anesthetic in infiltration, conduction or spinal anesthesia, as well as in surface anesthesia.Type: GrantFiled: November 30, 1971Date of Patent: January 25, 1977Inventors: Milda Jaovna Pormale, Nadezhda Alexandrovna Kashkina, Arvid Janovich Kalninsh, Varvara Nikolaevna Sergeeva, Janis Alexandrovich Surna, Janis Shusters, Modris Jaowich Melzobs, Waldis Danielowich Mikazhan, Indulis Waldowich Purwinsh, Antons Petrowich Skutelis, Martinsh Aleksandrowich Liepinsh