From N-c-(c=o)-oh Containing Reactant Or Acid Derivative Thereof, E.g., Alpha Amino Acid, Etc. Patents (Class 528/328)
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Patent number: 5494995Abstract: Copolymers of polyaspartic acid which are suitable for the inhibition of scale deposition were obtained by reacting maleic acid, an additional polycarboxylic acid and ammonia in a stoichiometric excess, at 120.degree.-350.degree. C., preferably 180.degree.-300.degree. C., to provide copolymers of polysuccinimide. In a second embodiment, a polyamine was added to the reaction mix. These intermediate polysuccinimide copolymers could then be converted to the salts of copolymers of polyaspartic acid by hydrolysis with a hydroxide.Such copolymers are useful in preventing deposition of scale from water and find applications in treating water. Other applications include scale prevention additives for detergents. In addition, such copolymers inhibit dental tartar and plaque formation.Type: GrantFiled: April 13, 1995Date of Patent: February 27, 1996Assignee: Bayer AGInventors: Louis L. Wood, Gary J. Calton
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Patent number: 5493004Abstract: The invention relates to an improved process for the preparation of polysuccinimide from maleic anhydride and ammonia, characterized in that the starting compounds are brought to reaction in liquid form in a tubular reactor with feed nozzle at temperatures of preferably 50.degree. C. to 500.degree. C. and residence times of preferably 0.1 to 600 seconds and the resulting reaction mixture is possibly further polymerized thermally in a high-viscosity reactor preferably continuously operated at 120.degree. C. to 300.degree. C.Type: GrantFiled: April 8, 1994Date of Patent: February 20, 1996Assignee: Bayer AGInventors: Torsten Groth, Winfried Joentgen, Dorde Jovcic, Paul Wagner, Hans-Joachim Traenckner
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Patent number: 5492996Abstract: Alcohol-soluble aromatic heterocyclic polymers having repeating units of the formula: ##STR1## wherein X is --O-- or --S--, and R is selected from the group consisting of: ##STR2## and R' is selected from the group consisting of alkyl having 1 to 5 carbon atoms, alkaryl having 7 to 12 carbon atoms, aralkyl having 7 to 12 carbon atoms and substituted aromatic having 1 to 3 substituent groups.The alcohol-soluble polymers may be used for fabricating organic/inorganic hybrid composites with metal alkoxides M(OQ).sub.v, wherein M is Si, Ti, Al or the like and Q is a lower alkyl group. These polymers can also be used to coat materials or substrates which are susceptible to attack by highly corrosive acids. On drying, the ionic bond between the trialkylamine and the sulfo group is broken and the polymer reverts to the parent structure, thereby leaving a polymer coating. Yet further, the original amine can be exchanged with a less volatile amine or an amine having a desired functionality.Type: GrantFiled: February 21, 1995Date of Patent: February 20, 1996Assignee: The United States of America as represented by the Secretary of the Air ForceInventors: Thuy D. Dang, Jom P. Chen, Fred E. Arnold
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Patent number: 5493005Abstract: Alcohol-soluble, aromatic heterocyclic copolymers having repeating units of the formula: ##STR1## wherein x has a value of 0.10 to 0.90 and y has a value of 1.0-x. These copolymers are useful in the preparation of organic/inorganic hybrid materials having transparency which comprise the sol-gel derived, hydrolytically condensed reaction product of a metal alkoxide of the formula M(OR).sub.w wherein R is a lower alkyl group, M is Si, Ti, Al or a mixture thereof, and w is the valence value of M, and the above copolymer.Type: GrantFiled: February 21, 1995Date of Patent: February 20, 1996Assignee: The United States of America as represented by the Secretary of the Air ForceInventors: Fred E. Arnold, Jom P. Chen
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Patent number: 5491212Abstract: A method for producing polysuccinimides is provided. A rotary tray dryer operating at an internal temperature of from about 110.degree. to about 300.degree. C. and providing a residence time of from about 1 hour to about 10 hours is used in the polycondensation of one or more amino acids, amic acids or ammonium salts of monoethylenically unsaturated dicarboxylic acids to produce polysuccinimides.Type: GrantFiled: January 12, 1994Date of Patent: February 13, 1996Assignee: Rohm and Haas CompanyInventors: Yi H. Paik, Ethan S. Simon, Graham Swift
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Patent number: 5491213Abstract: Polysuccinimide is prepared by reacting an unsaturated C.sub.2 dicarboxylic acid or anhydride thereof, e.g., maleic acid, fumaric acid, and maleic anhydride, with a particulate ammonium salt that is thermally decomposable to liberate ammonia. The reaction is carried out at a temperature which is above the thermal decomposition temperature of the ammonium salt and for a time period which is sufficient for the acid or anhydride to react with the ammonia liberated from the ammonium salt and for polymerization to occur. The present method avoids the prior art problems of controlling ammonia losses and water removal. The product polysuccinimide can be readily hydrolyzed to polyaspartic acid or a salt thereof, if desired.Type: GrantFiled: January 28, 1994Date of Patent: February 13, 1996Assignee: Donlar CorporationInventor: Daniel A. Batzel
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Patent number: 5488088Abstract: Copolymers of polyaspartic acid which are suitable for the inhibition of scale deposition were obtained by reacting maleic acid, an additional polycarboxylic acid and ammonia in a stoichiometric excess, at 120.degree.-350.degree. C., preferably 180.degree.-300.degree. C., to provide copolymers of polysuccinimide. In a second embodiment, a polyamine was added to the reaction mix. These intermediate polysuccinimide copolymers could then be converted to the salts of copolymers of polyaspartic acid by hydrolysis with a hydroxide.Such copolymers are useful in preventing deposition of scale from water and find applications in treating water. Other applications include scale prevention additives for detergents. In addition, such copolymers inhibit dental tartar and plaque formation.Type: GrantFiled: April 13, 1995Date of Patent: January 30, 1996Assignee: Bayer AGInventors: Louis L. Wood, Gary J. Calton
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Patent number: 5484878Abstract: A process is provided for preparing polysuccinimides by forming a polymerization mixture of poly(alkylene glycol), aspartic acid and, optionally, one or more other amino acids; heating the mixture to an elevated temperature; and maintaining the mixture at the elevated temperature to form polysuccinimides.Type: GrantFiled: August 25, 1994Date of Patent: January 16, 1996Assignee: Rohm and Haas CompanyInventors: Yi H. Paik, Ethan S. Simon, Graham Swift
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Patent number: 5484860Abstract: Copolymers of polyaspartic acid which are suitable for the inhibition of scale deposition were obtained by reacting maleic acid, an additional polycarboxylic acid and ammonia in a stoichiometric excess, at 120.degree.-350.degree. C., preferably 180.degree.-300.degree. C., to provide copolymers of polysuccinimide. In a second embodiment, a polyamine was added to the reaction mix. These intermediate polysuccinimide copolymers could then be converted to the salts of copolymers of polyaspartic acid by hydrolysis with a hydroxide.Such copolymers are useful in preventing deposition of scale from water and find applications in treating water. Other applications include scale prevention additives for detergents. In addition, such copolymers inhibit dental tartar and plaque formation.Type: GrantFiled: April 13, 1995Date of Patent: January 16, 1996Assignee: Bayer AGInventors: Louis L. Wood, Gary J. Calton
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Patent number: 5478919Abstract: Aspartic acid precursors such as mono and diammonium maleate, maleamic acid, ammonium maleamate, ammonium malate and mixtures of these and other precursors are copolycondensed thermally with a variety of mono, di and multifunctional monomers containing amino, hydroxyl and carboxyl functional groups. The resulting condensation copolymers and terpolymers contain succinimide units derived from aspartic acid precursors, condensed with other functional group monomers usually though amide and ester linkages. Hydrolysis of the polysuccinimide copolymers and terpolymers with alkali, alkaline earth and ammonium hydroxide produces aspartic acid copolymer and terpolymer salts.Type: GrantFiled: July 29, 1994Date of Patent: December 26, 1995Assignee: Donlar CorporationInventors: Larry P. Koskan, James F. Kneller, Daniel A. Batzel
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Patent number: 5470942Abstract: There is disclosed a process for preparing polyaspartic acid by thermal condensation of L-aspartic acid in a novel catalyst which shortens the reaction time and increases the molecular weight of the polymer. The novel catalyst is a catalytically effective methylenephosphonic acid. Typical catalysts are 1-hydroxyethylidene-1,1-diphosphonic acid and aminotris(methylenephosphonic acid). The methylenephosphonic acid is blended with the amino acid in a molar ratio of amino acid to catalyst in the range of from about 1:1 to 40:1.Type: GrantFiled: February 16, 1995Date of Patent: November 28, 1995Assignee: Monsanto CompanyInventors: Gregory C. Alexander, Mark E. Jason, Dennis J. Kalota
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Patent number: 5468838Abstract: Polysuccinimide, polyaspartic acid and their salts are prepared by reaction of maleic anhydride and ammonia, polycondensation of the resulting product in the presence of a solubilizing agent and, if appropriate, hydrolysis.Type: GrantFiled: March 14, 1994Date of Patent: November 21, 1995Assignee: Bayer AGInventors: Gunther Boehmke, Gerd Schmitz
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Patent number: 5466779Abstract: Polysuccinimide is prepared by reacting ammonia gas with liquid maleic anhydride. The reaction is initially carried out at a temperature which is above the melting point of the maleic anhydride but below the boiling point of liquid maleic anhydride for a time period sufficient for the liquid maleic anhydride to react with the ammonia gas to form a reaction product thereof. The reaction product is subsequently polymerized to polysuccinimide. The present method avoids the prior art problems of water removal and minimizes the need for ammonia handling equipment. The polysuccinimide product can be readily hydrolyzed to polyaspartic acid or a salt thereof, if desired.Type: GrantFiled: May 17, 1994Date of Patent: November 14, 1995Assignee: Donlar CorporationInventor: Robert J. Ross
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Patent number: 5466760Abstract: Higher molecular weight copolymers of polyaspartic acid which are suitable for the inhibition of scale deposition may be obtained by reacting maleic acid and ammonia in a stoichiometric excess, with a diamine or a triamine, at 120.degree.-350.degree. C., preferably 180.degree.-300.degree. C., and then converting the copolymer of polysuccinimide formed to a salt of a copolymer of polyaspartic acid by hydrolysis with a hydroxide.Type: GrantFiled: January 17, 1995Date of Patent: November 14, 1995Assignee: Srchem, Inc.Inventor: Louis L. Wood
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Patent number: 5463017Abstract: A process is provided for preparing polysuccinimides by forming a polymerization mixture of poly(alkylene glycol), maleamic acid and, optionally one or more other amic acids, heating the mixture to an elevated temperature, and maintaining the mixture at the elevated temperature to form polysuccinimides.Type: GrantFiled: August 25, 1994Date of Patent: October 31, 1995Assignee: Rohm and Haas CompanyInventors: Yi H. Paik, Ethan S. Simon, Graham Swift
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Patent number: 5461085Abstract: A process for preparing a novel superabsorbent polymer which is readily hydrolyzed and conform to environment by reacting a polysuccinimide with a diamine in an aqueous solution or an organic solvent to partially crosslink the polysuccinimide, and subsequently or concurrently hydrolyzing the remaining imide ring with an alkali while controlling the pH; and the superabsorbent polymer thus obtained.Type: GrantFiled: December 13, 1994Date of Patent: October 24, 1995Assignee: Mitsui Toatsu Chemicals, IncorporatedInventors: Akinori Nagatomo, Hiroaki Tamatani, Masanobu Ajioka, Akihiro Yamaguchi
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Patent number: 5457176Abstract: The present invention relates to an acid catalyzed thermal polycondensation process for producing amino acid polymers. More specifically, amino acid polymers are produced by thermally condensing a mixture of one or more amino acids and optionally one or more polyfunctional monomers, using an acid catalyst, while maintaining an intimate admixture. Processing techniques useful for maintaining an intimate admixture include adding to the mixture one or more processing aids, using mechanical means, and combinations thereof. The amino acid polymers produced by this process are useful as cleaning and detergent additives; fertilizer and pesticide additives; personal care product additives; dispersants for inorganic particulates, aqueous emulsions, and drilling muds; and water treatment and oil production operation additives as corrosion and scale inhibitors.Type: GrantFiled: March 16, 1994Date of Patent: October 10, 1995Assignee: Rohm and Haas CompanyInventors: David E. Adler, Michael B. Freeman, James M. Lipovsky, Yi H. Paik
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Patent number: 5449748Abstract: There is disclosed a process for preparing polysuccinimide by thermal condensation of L-aspartic acid to produce polysuccinimide wherein the L-aspartic acid is exposed to an atmosphere in excess of about 350.degree. C. and to a temperature in the range of from about 350.degree. C. to about 400.degree. C. for a period of time of from about 6 to about 15 minutes. Under such conditions, at least about 90% conversion of the L-aspartic acid is provided. The polysuccinimide may be hydrolysed to provide polyaspartic acid by conventional hydrolysis under basic conditions.Type: GrantFiled: December 27, 1994Date of Patent: September 12, 1995Assignee: Monsanto CompanyInventor: Skippy H. Ramsey
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Patent number: 5442038Abstract: Polymers of maleic acid may be prepared by thermally polymerizing malic acid, maleic acid or fumaric acid with less than one equivalent of ammonia. The polymers are modified by the incorporation of amines, carboxylic acids or combinations thereof. The polymers formed are excellent inhibitors of alkaline earth salt deposition, dispersants, tartar control additives, detergent additives, and water treatment agents.Type: GrantFiled: October 6, 1993Date of Patent: August 15, 1995Assignee: SRCHEM, Inc.Inventors: Louis L. Wood, Gary J. Calton
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Patent number: 5442029Abstract: A new method for preparing commercially valuable polymeric ketones is described. The method employs an .alpha.-amiononitrile as a monomeric unit whereby an amorphous, soluble polymer having protected carbonyl moiety is obtained. Upon deprotecting the carbonyl moiety, a crystalline polymeric ketone is obtained. The method allows production of polymeric ketone materials having aromatic, aliphatic or mixed aromatic/aliphatic backbones.Type: GrantFiled: August 26, 1994Date of Patent: August 15, 1995Assignees: The Center for Innovative Technology, Virginia Polytechnic Institue & State University, Virginia Tech Intellectual PropertiesInventors: Harry W. Gibson, Ashish Pandya
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Patent number: 5430073Abstract: The invention relates to a process for preparing a polymer in which in situ polymerization of monomers takes place in the presence of a catalyst, in which the monomers are obtained by in situ activation of precursor monomers.According to the invention a premature polymerization is avoided, but polymerization only starts at the desired moment.Type: GrantFiled: July 15, 1993Date of Patent: July 4, 1995Assignee: DSM, N.V.Inventors: Hans K. Van Dijk, Ronald M. A. M. Schellekens, Markus J. H. Bulters, Olav M. Aagaard, Gerard P. De Vries, Matthias J. G. Brouns
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Patent number: 5424391Abstract: A method for producing polysuccinimide is provided. Thermal polymerization of fumaramic acid at a temperature of from about 160.degree. C. to about 330.degree. C. produces polysuccinimide. The reaction is optionally conducted in the presence of one or more processing aids, solvents or diluents. The polysuccinimide is particularly useful as a detergent additive.Type: GrantFiled: July 20, 1993Date of Patent: June 13, 1995Assignee: Rohm and Haas CompanyInventors: Yi H. Paik, Graham Swift, Ethan S. Simon, Michael B. Freeman
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Patent number: 5408029Abstract: Polymers of maleic, fumaric or malic acids or maleic, fumaric or malic acid and ammonia with amino acids are prepared by heating at 180.degree.-350.degree. C., preferably 200.degree.-300.degree. C. The polymer formed may be converted to a salt by hydrolysis with a metal hydroxide or ammonium hydroxide.Type: GrantFiled: October 6, 1993Date of Patent: April 18, 1995Assignee: SRCHEM, Inc.Inventors: Lousi L. Wood, Gary J. Calton
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Patent number: 5407985Abstract: Stable aqueous microdispersions of finely divided polyamide resin particles and methods for the manufacture thereof are provided. The properties of these microdispersions are achieved by the addition thereto of an effective amount of a co-surfactant such as a lower alkyl alcohol. The provided microdispersions can be drawn into films which will form clear, continuous films at ambient or near-ambient temperatures regardless of the softening point of the polyamide resin. Dispersions according to this invention find use in hot melt adhesives, coatings, inks, and the like.Type: GrantFiled: March 25, 1991Date of Patent: April 18, 1995Assignee: Union Camp CorporationInventor: George A. Smith
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Patent number: 5408028Abstract: Copolymers of polyaspartic acid which are suitable for the inhibition of scale deposition were obtained by reacting maleic acid, an additional polycarboxylic acid and ammonia in a stoichiometric excess, at 120.degree.-350.degree. C., preferably 180.degree.-300.degree. C., to provide copolymers of polysuccinimide. In a second embodiment, a polyamine was added to the reaction mix. These intermediate polysuccinimide copolymers could then be converted to the salts of copolymers of polyaspartic acid by hydrolysis with a hydroxide.Such copolymers are useful in preventing deposition of scale from water and find applications in treating water. Other applications include scale prevention additives for detergents. In addition, such copolymers inhibit dental tartar and plaque formation.Type: GrantFiled: December 22, 1992Date of Patent: April 18, 1995Inventors: Louis L. Wood, Gary J. Calton
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Patent number: 5395916Abstract: A biodegradable copolymer having the constituent units represented by the structures (I) and (II): ##STR1## wherein X represents a hydrogen atom, an acyl group having the formula RCO-- where R is a hydrocarbon group having 1 to 20 carbon atoms, an alkoxy group having to 20 carbon atoms, and Y represents a hydrogen atom or an alkyl group having 1 to 8 carbon atoms, and m and n are independently integers of 1 or more, m+n is at least 10, and m/(m+n) is at least 0.01 and a pharmaceutical composition containing the same.Type: GrantFiled: May 17, 1993Date of Patent: March 7, 1995Assignee: Teijin LimitedInventors: Seiji Mochizuki, Kiyoshi Nawata, Yuji Makino, Yoshiki Suzuki
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Patent number: 5393868Abstract: A method for producing polysuccinimide is provided. Thermal polymerization of maleamic acid at a temperature of from about 160.degree. C. to about 330.degree. C. produces polysuccinimide. The reaction is optionally conducted in the presence of one or more processing aids, solvents or diluents. The polysuccinimide is particularly useful as a detergent additive.Type: GrantFiled: October 13, 1992Date of Patent: February 28, 1995Assignee: Rohm and Haas CompanyInventors: Michael B. Freeman, Yi H. Paik, Ethan S. Simon, Graham Swift
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Patent number: 5391826Abstract: Diamidopolyamines are prepared by reacting glutamic acid with two moles, per mole of glutamic acid, of a defined class of diamines, including oxyethyelene diamines, oxypropylenediamines, oxyethylene/propylene diamines, oxypropylene triamines, 1,2-diaminocyclohexane and isophorone diamine, whereby each of the carboxyl groups of the glutamic acid will react with an amine group of the amine reactant to thereby provide primary amine terminated amidopolyamines containing, internally, the unreacted primary amine group of the glutamic acid.Type: GrantFiled: May 4, 1990Date of Patent: February 21, 1995Assignee: Huntsman CorporationInventors: George P. Speranza, Jiang-Jen Lin
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Patent number: 5380817Abstract: A process is provided for preparing polysuccinimides by forming a polymerization mixture of poly(alkylene glycol), aspartic acid and, optionally, one or more other amino acids; heating the mixture to an elevated temperature; and maintaining the mixture at the elevated temperature to form polysuccinimides.Type: GrantFiled: July 10, 1992Date of Patent: January 10, 1995Assignee: Rohm and Haas CompanyInventors: Yi H. Paik, Ethan S. Simon, Graham Swift
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Patent number: 5378807Abstract: A method is disclosed for significantly diminishing the rate of degradation of naturally-produced .gamma.-PGA in a .gamma.-PGA-producing cell culture. Also, a method is disclosed for significantly decreasing the water solubility coefficient of naturally-produced .gamma.-PGA by forming derivatives of .gamma.-PGA. In addition, a polymer solution is disclosed which includes a polysaccharide component and a .gamma.-PGA component.Type: GrantFiled: February 7, 1992Date of Patent: January 3, 1995Assignee: University of Massachusetts at LowellInventors: Richard A. Gross, Stephen P. McCarthy, Devang T. Shah
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Patent number: 5373085Abstract: Memory enhancing thermal proteins were synthesized from heating aspartic acid, glutamic acid, proline and tryptophan above 100.degree. C. Two hydrophobic and one non-hydrophobic polymer were injected intracerebroventricularly into the brains of mice after the mice had undergone partial training in footshock avoidance conducted in a T-maze. When retention of footshock avoidance was tested one week later, the hydrophobic polymers enhanced retention while the non-hydrophobic polymer did not.Type: GrantFiled: September 28, 1992Date of Patent: December 13, 1994Inventors: Sidney W. Fox, James F. Flood
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Patent number: 5373088Abstract: Polyaspartic acid is produced by thermal condensation of ammonium maleate derived from maleic acid and ammonia. Solid ammonium maleate in particulate form is heated to a temperature of at least about 170.degree. C. to effect thermal condensation to a polysuccinimide which is then base hydrolyzed to a polyaspartic acid salt.Type: GrantFiled: January 28, 1994Date of Patent: December 13, 1994Assignee: Donlar CorporationInventors: Larry P. Koskan, Abdul R. Y. Meah
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Patent number: 5373086Abstract: .beta.-Polyaspartic acid having a weight average molecular weight of 1000 to 5000 produced by hydrolysis of anhydropolyaspartic acid exhibits a high degree of calcium carbonate and calcium phosphate inhibition.Type: GrantFiled: January 26, 1994Date of Patent: December 13, 1994Assignee: Donlar CorporationInventors: Larry P. Koskan, Kim C. Low, Abdul R. Y. Meah, Anne M. Atencio
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Patent number: 5371180Abstract: Polysuccinimide is prepared by reaction of fumaric acid, maleic acid or a derivative thereof with urea, isourea, carbamic acid, ammonium carbamide, ammonium bicarbonate, diammonium carbonate or mixtures of the abovementioned substances in a reactor at temperatures of preferably 100.degree. C. to 300.degree. C. over reaction times of preferably 0.5 minute to 300 minutes.Type: GrantFiled: March 31, 1994Date of Patent: December 6, 1994Assignee: Bayer AGInventors: Torsten Groth, Winfried Joentgen, Gunter Boehmke, Gerd Schmitz, Hans-Joachim Traenckner
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Patent number: 5371179Abstract: Polysuccinimide polymers of from about 5 to 100 percent by weight of methylenesuccinimide moieties, and from 0 to about 95 percent by weight of one or more amino acid moieties are provided. A process is provided for preparing polysuccinimide polymers by forming a polymerization mixture of poly(alkylene glycol), ammonia, one or more monoethylenically unsaturated poly(carboxylic acids) and, optionally, one or more other monoethylenically unsaturated compounds; heating the mixture to an elevated temperature; and maintaining the mixture at the elevated temperature to form polysuccinimide polymers.Type: GrantFiled: July 10, 1992Date of Patent: December 6, 1994Assignee: Rohm and Haas CompanyInventors: Yi H. Paik, Ethan S. Simon, Graham Swift
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Patent number: 5371177Abstract: A process is provided for preparing polysuccinimides by forming a polymerization mixture of poly(alkylene glycol), maleamic acid and, optionally one or more other amic acids, heating the mixture to an elevated temperature, and maintaining the mixture at the elevated temperature to form polysuccinimides.Type: GrantFiled: July 10, 1992Date of Patent: December 6, 1994Assignee: Rohm and Haas CompanyInventors: Yi H. Paik, Ethan S. Simon, Graham Swift
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Patent number: 5371183Abstract: The present invention provides a process for preparing urethanes and carbonates from an amine or an alcohol, carbon dioxide and a hydrocarbyl halide. The amine or alcohol is reacted with carbon dioxide in a suitable solvent system and in the presence of an amidine or guanidine base, to form the ammonium carbamate or carbonate salt which is then reacted in a polar aprotic solvent with a hydrocarbyl halide. Polymer products can also be prepared utilizing this process or utilizing the resulting urethanes and carbonates under standard polymerization conditions.Type: GrantFiled: November 16, 1992Date of Patent: December 6, 1994Assignee: Monsanto CompanyInventors: William D. McGhee, Dennis P. Riley
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Patent number: 5344914Abstract: A new method for preparing commercially valuable polymeric ketones is described. The method employs an .alpha.-amiononitrile as a monomeric unit whereby an amorphous, soluble polymer having protected carbonyl moiety is obtained. Upon deprotecting the carbonyl moiety, a crystalline polymeric ketone is obtained. The method allows production of polymeric ketone materials having aromatic, aliphatic or mixed aromatic/aliphatic backbones.Type: GrantFiled: October 5, 1992Date of Patent: September 6, 1994Assignee: The Center for Innovative Technology*Inventors: Harry W. Gibson, Ashish Pandya
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Patent number: 5319145Abstract: A method for producing polysuccinimides is provided. A rotary tray operating at an internal temperature of from about 110 to about 300.degree. C. and providing a residence time of from about 1 hour to about 10 hours is used in the polycondensation of one or more amino acids, amic acids or ammonium salts of monoethylenically unsaturated dicarboxylic acids to produce polysuccinimides.Type: GrantFiled: July 10, 1992Date of Patent: June 7, 1994Assignee: Rohm and Haas CompanyInventors: Yi H. Paik, Ethan S. Simon, Graham Swift
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Patent number: 5317065Abstract: The invention relates to biologically degradable polymers, in particular polyaminodicarboxylic acid-co-anhydroaminodicarboxylic acid derivatives, to a process for their preparation and to the use thereof for depot preparations having controlled delivery of active compound.Type: GrantFiled: March 25, 1993Date of Patent: May 31, 1994Assignee: Hoechst AktiengesellschaftInventors: Volker Krone, Axel Walch
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Patent number: 5292864Abstract: Solutions of polymers of aspartic acid or its amine copolymers prepared by thermal condensation are reacted with a decolorizing agent selected from the group consisting of hypochlorfte, chlorine, chlorine dioxide, hydrogen peroxide, a peroxycarboxylate or ozone, sufficient in strength to effect the desired decolorization.Type: GrantFiled: April 7, 1993Date of Patent: March 8, 1994Assignee: SRCHEM IncorporatedInventors: Louis L. Wood, Gary J. Calton
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Patent number: 5284936Abstract: Substantially water-insoluble, crosslinked polypeptides containing 15 to 85 mole % of amino acid residues such as glutamic acid, aspartic acid, phosphoserine, phosphohomoserine, phosphotyrosine, phosphothreonine, phosphoasparagine, or phosphoglutamine, and 15 to 85 mole % of amino acid residues such as lysine, arginine, asparagine, glutamine, serine or tyrosine, in which the degree of crosslinking is sufficient to result in a substantially water-insoluble polypeptide with the ability to absorb a 1 wt. % aqueous NaCl solution in an amount of at least 20 times the weight of the polypeptide, are useful as superabsorbents in devices such as diapers, etc. Mild alkaline hydrolysis of the crosslinked polypeptides increases their superabsorbency by two to three fold.Type: GrantFiled: April 17, 1992Date of Patent: February 8, 1994Assignee: University of South AlabamaInventors: Julie Donachy, C. Steven Sikes
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Patent number: 5279821Abstract: Here is disclosed a water-insoluble pyrogen adsorbent composed of a polymer possessing amide groups optionally modified, said polymer being, e.g., a poly amino acid, a nylon, on a polyacrylamide.Type: GrantFiled: August 30, 1991Date of Patent: January 18, 1994Assignees: Chuichi Hirayama, Hirotaka Ihara, Ajinomoto Co., Inc.Inventors: Chuichi Hirayama, Hirotaka Ihara, Shunsei Tsunoda, Katsutoshi Aihara, Kazufumi Yagyu, Masao Honma
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Patent number: 5254669Abstract: The present invention relates to a process for the manufacture of a crosslinked polymer, wherein a crosslinking reaction is carried out between an organic crosslinking agent which is a polyacid or a derivative of a polyacid, and a long chain alkylpolyamine having at least two amine functional groups which may be primary and/or secondary and which is not a succinimide. The long chain alkylpolyamine can be obtained by a method comprising reacting a corresponding long chain alkylcarbonyl compound with an amine. The long chain carbonyl compound is for example prepared by ozonolysis of a polyolefin which can be a polybutene. The obtained crosslinked polymer can be used as an additive in lubricant compositions.Type: GrantFiled: August 25, 1992Date of Patent: October 19, 1993Assignee: BP Chemicals LimitedInventor: John R. Blackborow
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Patent number: 5247068Abstract: Substantially water-insoluble, crosslinked polypeptides containing 15 to 85 mole % of amino acid residues such as glutamic acid, aspartic acid, phosphoserine, phosphohomoserine, phosphotyrosine, phosphothreonine, phosphoasparagine, or phosphoglutamine, and 15 to 85 mole % of amino acid residues such as lysine, arginine, asparagine, glutamine, serine or tyrosine, in which the degree of crosslinking is sufficient to result in a substantially water-insoluble polypeptide with the ability to absorb a 1% aqueous NaCl solution in an amount of at least 20 times the weight of the polypeptide, are useful as superabsorbents in devices such as diapers, etc.Type: GrantFiled: March 29, 1991Date of Patent: September 21, 1993Assignee: University of South AlabamaInventors: Julie Donachy, Steven Sikes
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Patent number: 5241018Abstract: The terminal-modified imide oligomer composition capable of being cured within a short time and of being converted to a shaped, cured resin article having a high mechanical strength, heat resistance and elastic modulus, comprises a rigid, high molecular weight aromatic polyimide (I) produced by polymerizing and imidizing a tetracarboxylic acid component comprising at least one biphenyltetracarboxylic acid compound with an amine component comprising at least one aromatic diamine compound (a) having at least one cyclic structure and two amino groups directly attached to the cyclic structure; a flexible imide oligomer (II) produced by polymerizing and imidizing the tetracarboxylic acid component, with a diamine component comprising at least one aromatic diamine compound (b) having at least two cyclic structures and two amino groups attached directly or through a divalent bonding member to the cyclic structures and a monoamine component comprising at least one monoamine compound (c) having an unsaturated hydrocarType: GrantFiled: June 5, 1992Date of Patent: August 31, 1993Assignee: Ube Industries, Ltd.Inventors: Shinji Yamamoto, Yasuo Hirano, Kazuyoshi Fujii
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Patent number: 5236996Abstract: Stable aqueous dispersions of finely divided piperazine-containing polyamide resin particles and methods for the manufacture thereof are provided. Dispersions according to this invention find use in hot melt adhesives, coatings, inks, and the like.Type: GrantFiled: July 24, 1991Date of Patent: August 17, 1993Assignee: Union Camp CorporationInventor: George A. Smith
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Patent number: 5229469Abstract: The invention relates to biologically degradable polymers, in particular polyaminodicarboxylic acid-co-anhydroaminodicarboxylic acid derivatives, to a process for their preparation and to the use thereof for depot preparations having controlled delivery of active compound.Type: GrantFiled: January 29, 1991Date of Patent: July 20, 1993Assignee: Hoechst AktiengesellschaftInventors: Volker Krone, Axel Walch
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Patent number: 5221733Abstract: Polyaspartic acid having a weight average molecular weight of 1000 to 5000 is produced by hydrolysis of anhydropolyaspartic acid. Anhydropolyaspartic acid is produced by condensation polymerization of L-aspartic acid. Greater than 80% conversion is achievable utilizing "temperature vs time" profiles.Type: GrantFiled: February 22, 1991Date of Patent: June 22, 1993Assignee: Donlar CorporationInventors: Larry P. Koskan, Kim C. Low, Abdul R. Y. Meah, Anne M. Atencio
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Patent number: 5219986Abstract: The invention is a process of manufacture, and a product manufactured by that process. The process comprises various steps. The steps include charging aspartic acid particles into a process unit and heating those particles to approximately 400.degree.-480.degree. F. As the aspartic acid particles are heated, vacuum is applied to that unit. Water is removed from the aspartic acid to form polyanhydroaspartic acid.Type: GrantFiled: October 28, 1991Date of Patent: June 15, 1993Assignee: Cygnus CorporationInventor: Thomas A. Cassata