With Nitrogen-containing Reactant Patents (Class 528/363)
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Patent number: 5391642Abstract: 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 polysuccinimlde formed to a salt of a copolymer of polyaspartic acid by hydrolysis with a hydroxide.Type: GrantFiled: June 17, 1994Date of Patent: February 21, 1995Assignee: SRCHEM IncorporatedInventor: Louis L. Wood
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Patent number: 5386000Abstract: Described is a flexible adhesive formulation for bonding a semiconductor device to a flexible substrate and a flexible card containing a semiconductor device which can be processed in a computer.Type: GrantFiled: December 3, 1993Date of Patent: January 31, 1995Assignee: Johnson Matthey Inc.Inventor: My N. Nguyen
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Patent number: 5385778Abstract: Toughened thermosetting resins are disclosed comprising a thermosetting resin having a Tg of at least 150.degree. C., preferably 180.degree. C., and having dispersed substantially uniformly therethrough microspheres of a thermoplastic resin having a Tg of at least 150.degree. C., preferably 180.degree. C. It is preferred to use thermoplastic resins with functional groups on the surface thereof capable of bonding to an available group on the thermosetting resin. High performance structural composites made from such toughened resins are disclosed as well as the process of making such composites.Type: GrantFiled: July 19, 1993Date of Patent: January 31, 1995Assignee: Southwest Research InstituteInventors: Marvin L. Deviney, Joel J. Kampa
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Patent number: 5380816Abstract: Linear polyester diols suitable for the preparation of thermoset coatings having improved flexibility and hardness are disclosed. The linear polyesters consist essentially of recurring units of isophthalic acid, an aliphatic diol component including 2-methyl-1,3-propanediol, and optionally, a dicarboxylic acid other than isophthalic acid. The linear polyester diols are useful for thermosettable resin compositions that comprise the polyester diol, an aminoplast crosslinking agent, and a catalyst.Type: GrantFiled: May 2, 1991Date of Patent: January 10, 1995Inventor: Carl J. Sullivan
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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: 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: 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: 5371167Abstract: A coating composition is described comprising two components that are reactable with each other to cure the coating. The two components are:(a) a carboxyl-functional polyurethane component that is the reaction product of:(i) a polyisocyanate compound, and(ii) a compound comprising at least one acid group and at least one isocyanate-reactive group,(b) a component comprising at least two groups that are reactive with the epoxy groups on the polyurethane compound.Type: GrantFiled: October 29, 1992Date of Patent: December 6, 1994Assignee: BASF CorporationInventors: John W. Rehfuss, Walter H. Ohrbom
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Patent number: 5371178Abstract: Described is a rapidly curing adhesive formulation and a method of reducing the curing time of an adhesive formulation containing cyanate ester.Type: GrantFiled: December 3, 1993Date of Patent: December 6, 1994Assignee: Johnson Matthey Inc.Inventor: My N. Nguyen
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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: 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: 5367047Abstract: Polyaspartate, useful for inhibition of incrustations due to materials causing hardness in water and of value in detergent formulations, can be prepared by reacting maleic acid or fumaric acid in a molar ratio of 1:1-2.1 at temperatures greater than 190.degree. C., followed by conversion of the polymer formed in this reaction to a salt of polyaspartic acid by basic hydrolysis.Type: GrantFiled: February 22, 1994Date of Patent: November 22, 1994Assignee: Srchem IncorporatedInventor: Louis L. Wood
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Patent number: 5360887Abstract: A flame-retarded thermosetting resin composition is provided by blending about 5 to 45 mole % of a phenylcyanate having at least one halogen substituent at the ortho or para position relative to the cyanato group, and about 55 to 95 mole % of a halogen-free bis-4-phenylcyanate. A flame retardancy of V-O grade of UL94 is achieved in the thermoset resin of the composition without compromising dielectric, heat resistance, moisture absorption and other properties.Type: GrantFiled: July 28, 1993Date of Patent: November 1, 1994Assignee: Kanegafuchi Kagaku Kogyo Kabushiki KaishaInventors: Hidenari Tsunemi, Toshinobu Nakata, Koyoyuki Namura
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Patent number: 5357009Abstract: A polymer scale preventive agent for use in polymerization of a monomer having an ethylenically unsaturated double bond, comprising an alkaline solution containing a condensation product of (A) an aliphatic diamine compound and (B) an aromatic tetracarboxylic acid anhydride. This agent is used for forming a coating on the inner wall, etc. of a polymerization vessel. Such a vessel is effective in preventing polymer scale deposition, not only on the areas in the liquid phase but also near the interface between the liquid phase and the gas phase in the vessel, and useful in producing a polymer that shows very few fish eyes and good whiteness when formed into sheets or the like.Type: GrantFiled: June 4, 1993Date of Patent: October 18, 1994Assignee: Shin-Etsu Chemical Co., Ltd.Inventors: Toshihide Shimizu, Mikio Watanabe
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Patent number: 5357004Abstract: 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. Alkyl or substituted alkyl groups may be incorporated in the backbone of the polymer by adding a alkyl or substituted alkyl monoamine to maleic acid and ammonia and heating at 120.degree. C. or more until polymerization has occurred.Type: GrantFiled: February 14, 1994Date of Patent: October 18, 1994Assignee: Srchem IncorporatedInventors: Gary J. Calton, Louis L. Wood
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Patent number: 5352764Abstract: A stepwise linear polymer composition having intense magnetic properties and a method for preparation of same. A phthalimide compound and an aromatic dialiphatic acid are reacted in the presence of an acetate of monovalent metal at elevated temperatures to form a phenylenebis diphthalimidine compound. The phenylenebis diphthalimidine compound is then reacted with 3-benzylidine phthalimidine and a metal salt of an aliphatic acid at elevated temperatures under an inert gas to form the intensely magnetic polymer. The reactions may be carried out in the presence of a solvent.Type: GrantFiled: October 26, 1993Date of Patent: October 4, 1994Assignee: Northrop CorporationInventor: Jack D. Mackey
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Patent number: 5340915Abstract: A crosslinked polymer composition having intense magnetic properties and a method for preparation of same. A phthalimide compound and an aromatic dialiphatic acid are reacted in the presence of an acetate of a monovalent metal at elevated temperatures to form a phenylenebis diphthalimidine compound. The phenylenebis diphthalimidine compound is then reacted with a metal salt of an aliphatic acid at elevated temperatures under an inert gas to form the intensely magnetic crosslinked polymer. The reactions may be carried out in the presence of a solvent.Type: GrantFiled: May 4, 1993Date of Patent: August 23, 1994Assignee: Northrop CorporationInventor: Jack D. Mackey
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Patent number: 5296578Abstract: Production of polysuccinimide by reacting maleic anhydride and ammonia at elevated temperatures. The base hydrolyzed polyaspartic acid product.Type: GrantFiled: September 18, 1992Date of Patent: March 22, 1994Assignee: Donlar CorporationInventors: Larry P. Koskan, Abdul R. Y. Meah
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Patent number: 5292858Abstract: Copolymers of polyamino acids formed by reaction of an alcohol with maleic anhydride to form the half ester followed by addition of ammonia, ammonia and an amine, or ammonia and a polyamine. The mixture is then heated to 120.degree.-350.degree. C. to form polysuccinimide or a derivative thereof. The resulting polysuccinimide may be hydrolyzed to form a derivative of polyaspartic acid or its salt.Type: GrantFiled: March 16, 1993Date of Patent: March 8, 1994Assignee: SRCHEM IncorporatedInventor: Louis L. Wood
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Patent number: 5288783Abstract: Polyaspartate, useful or inhibition of incrustations due to materials causing hardness in water and of value in detergent formulations, can be prepared by reacting maleic acid or fumaric acid in a molar ratio of 1:1-2.1 at temperatures greater than 170.degree. C., followed by conversion of the polymer formed in this reaction to a salt of polyaspartic acid by basic hydrolysis.Type: GrantFiled: January 21, 1993Date of Patent: February 22, 1994Assignee: Srchem IncorporatedInventor: Louis L. Wood
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Patent number: 5286810Abstract: 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: April 7, 1993Date of Patent: February 15, 1994Assignee: SRCHEM IncorporatedInventor: Louis L. Wood
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Patent number: 5284924Abstract: Terpolymers of polyolefin/acrylic acid or substituted acrylic acid/acrylonitrile are prepared by combining a polyolefin/acrylic acid or substituted acrylic acid copolymer with at least one dinitrile to form a mixture and reacting the mixture at a temperature of at least 200.degree. C. for a time sufficient to form the terpolymer. Copolymers of polyolefin/acrylonitrile are obtained when the reaction is carried to completion. The total reaction masses obtained comprising terpolymer or copolymer, cyclic imide, solvent, when used and any unreacted dinitrile find use as pour point depressants in heavy hydrocarbon oils.Type: GrantFiled: October 23, 1991Date of Patent: February 8, 1994Assignee: Conoco Inc.Inventors: Kenneth W. Pober, Charles M. Starks
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Patent number: 5281675Abstract: Novel cyclic imino ether compositions containing one or more mesogenic moieties, when polymerized, result in products having improved properties.Type: GrantFiled: February 6, 1992Date of Patent: January 25, 1994Assignee: The Dow Chemical CompanyInventors: Robert E. Hefner, Jr., Jimmy D. Earls
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Patent number: 5280069Abstract: The new compound N,N,N'N'-tetraglycidyl-3,3'-diethyl-4,4'-diaminodiphenylmethane and curable resin compositions containing it.Type: GrantFiled: April 30, 1991Date of Patent: January 18, 1994Assignee: Ciba-Geigy CorporationInventors: Bryan Dobinson, Michael R. Thoseby
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Patent number: 5252692Abstract: Novel amphoteric acrylic and methacrylic copolymers are described comprising cationic units of pendant N-substituted amidine and anionic units of acrylic or methacrylic acid and/or acidic groups carried by substituents of N-acrylamide, N-methacrylamide, N-acrylamidine or N-methacrylamidine. One preferred embodiment is a copolymer in which at least some types of functional groups are organized in blocks. Particularly preferred are blocks of pendant nitrile groups. Preferred compositions have the said N-substituents of the amides and/or amidines containing polar groups other than primary amines. Particularly preferred polar groups are tertiary amines, quaternary ammonium salts, hydroxyls and sulfonic acid. These copolymers may optionally be convalently or physically crosslinked and swellable rather than soluble in water.Type: GrantFiled: November 23, 1990Date of Patent: October 12, 1993Assignee: Kingston Technologies, Inc.Inventors: Jan Lovy, Vladimir A. Stoy
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Patent number: 5252700Abstract: The heat resistant adhesive of the invention comprises polyamic acid and/or polyimide which are prepared by using 1,3-bis(3-aminophenoxy)benzene as an aromatic diamine component and 3,3', 4,4'-biphenyltetracarboxylic dianhydride, 3,3',4,4'-benzophenonetetracarboxylic dianhydride and/or 3,3',4,4'-diphenylethertetracarboxylic dianhydride as tetracarboxylic acid dianhydrides, and further by blocking the polymer chain end with dicarboxylic anhydride or a monoamine compound; or comprises a polyimide solution containing the polyimide in a good solvent.The adhesive of the invention is a heat-resistant adhesive capable of adhering under mild temperature/mild pressure conditions. The adhesive of polyimide solution can provide desired adhesion by simple procedures such as applying to the adherend and heating under pressure and exhibits excellent adhesive strength.Type: GrantFiled: April 21, 1992Date of Patent: October 12, 1993Assignee: Mitsui Toatsu Chemicals, Inc.Inventors: Hideaki Okikawa, Shoji Tamai, Katsuaki Iiyama, Saburo Kawashima, Akihiro Yamaguchi, Tadashi Asanuma
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Patent number: 5250600Abstract: Described is a flexible adhesive formulation for bonding a semiconductor device to a flexible substrate and a flexible card containing a semiconductor device which can be processed in a computer.Type: GrantFiled: May 28, 1992Date of Patent: October 5, 1993Assignee: Johnson Matthey Inc.Inventors: My N. Nguyen, Yuan Y. Chien
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Patent number: 5225519Abstract: Described is a coating composition comprising at least a polycarbodiimide component having at least two carbodiimide groups per molecule, at least one anhyride component having one or more carboxylic acid anhydride groups per molecule, and a hydroxylic reagent capable of reacting with said anhydride component to generate free carboxylic polyacids, at least one among said components and reagents being a compound suitable for forming films. The composition produces fast cross-linking coatings at low temperatures.Type: GrantFiled: January 24, 1992Date of Patent: July 6, 1993Assignee: Industrie Vernici Italiane S.p.A.Inventor: Antonio Tortolina
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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: 5219952Abstract: A method of producing high molecular weight polysuccinimide and high molecular weight polyaspartic acid. Reacting maleic anhydride with ammonia and further reacting with polymerized polysuccinimide. Hydrolyzing the resultant product to form polyaspartic acid.Type: GrantFiled: September 18, 1992Date of Patent: June 15, 1993Assignee: Donlar CorporationInventors: Larry P. Koskan, Abdul R. Y. Meah
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Patent number: 5191059Abstract: Poly (Reissert compounds) can be formed by reaction of a coupled bis(isoquinoline), e.g., a 4,4' -coupled bis(isoquinoline), a diacid chloride, e.g. adipoyl chloride, and a source of cyanide, e.g., trimethylsilyl cyanide.Type: GrantFiled: April 15, 1991Date of Patent: March 2, 1993Assignee: Virginia Tech Intellectual Properties, Inc.Inventors: Harry W. Gibson, Yajnanarayana H. R. Jois
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Patent number: 5189134Abstract: Novel nonlinearly optically active polymers, well suited for electrooptical applications, are prepared by copolymerizing a first difunctional monomer with a second difunctional comonomer, with at least one of such difunctional monomers including a polar charge transfer moiety containing at least one electron acceptor group and at least one electron donor group (D), and further wherein the polymerizable functional groups are borne by the one or more electron donor groups (D).Type: GrantFiled: September 18, 1989Date of Patent: February 23, 1993Assignee: Rhone-Poulenc ChimieInventors: Gerard Mignani, Pascal Barthelemy, Remi Meyrueix
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Patent number: 5159047Abstract: Crosslinkable coatings that contain a polyol component which is a caprolactone oligomer containing a cycloaliphatic moiety having improved properties, especially lower viscosity and improved coating hardness, and are useful for coating metals and plastics.Type: GrantFiled: June 14, 1991Date of Patent: October 27, 1992Assignee: E. I. du Pont de Nemours and CompanyInventor: John A. Simms
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Patent number: 5138078Abstract: A compound of the formula (I) ##STR1## wherein R is hydrogen, methyl of C.sub.2 -C.sub.5 alkyl and R.sup.1 is O-phenylene, a saturated or unsaturated 1,2-cyclohexylene group; a 2,3-bicyclo[2.2.2]-hept-5-enyl group of the formula (II) ##STR2## or a saturated or unsaturated aliphatic group of about 2 to about 20 carbon atoms; said O-phenylene is optionally substituted in the ring by one or two alkyl groups of from 1 to 4 carbon atoms; said 1,2-cyclohexylene and bicyclo groups are optionally substituted by one or two alkyl groups of from 1 to 4 carbon atoms and/or by one to six chlorine or bromine atoms; and said aliphatic group is optionally substituted by one or more chlorine or bromine atoms. This compound can be used as a coating compound when mixed with curing agents.Type: GrantFiled: December 10, 1990Date of Patent: August 11, 1992Assignee: Ciba-Geigy CorporationInventor: Vincent Brytus
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Patent number: 5093456Abstract: This invention provides synthetic routes for novel single isomers of monocarbamate diols and their polymerization to provide novel polyesters, polyurethanes, polycarbonates, and the like having pendant carbamate groups on the polymer chain. Devices using some of these novel polymers which demonstrate nonlinear optical activity are also disclosed.Type: GrantFiled: June 14, 1989Date of Patent: March 3, 1992Assignee: Minnesota Mining and Manufacturing CompanyInventors: Smarajit Mitra, Cecil V. Francis
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Patent number: 5089545Abstract: A chemical method of producing organic switching and memory units for electronic computer elements which comprises the self-assembly of said elements from polyamino acids exclusive of flavin and pterin pigments and mono-amino-dicarboxylic acids, and membranous planar, spherical and tubular structures produced thereby.Type: GrantFiled: February 12, 1989Date of Patent: February 18, 1992Assignee: Biotech International, Inc.Inventor: Alexander T. Pol
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Patent number: 5089585Abstract: A new class of transition metal bis(dithiolene) complex polymers having improved physical characteristics. These polymers are generally prepared by first preparing a bifunctionalized transition metal bis(dithiolene) complex, then reacting the bifunctionalized complex with one or more other bifunctional compounds. A wide variety of flexible linkage can be incorporated into the polymer chain via the bifunctional reactant to vary the physical properties of the resulting polymer. The polymers can be used as near infrared filters, both as supported and freestanding films.Type: GrantFiled: May 1, 1990Date of Patent: February 18, 1992Assignee: Board of Regents, The University of Texas SystemInventors: John R. Reynolds, Fei Wang
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Patent number: 5066773Abstract: A poly Ressert can be formed by first reacting benzimidazole with an aliphatic diacid chloride to form bisbenzimidazole and then reacting the bisbenzimidazole with an aliphatic diacid chloride and cyanide to form the poly Reissert.Type: GrantFiled: October 6, 1989Date of Patent: November 19, 1991Assignee: Virginia Tech Intellectual Properties, Inc.Inventors: Harry W. Gibson, Yajnanarayana H. R. Jois
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Patent number: 5061784Abstract: Polyimides and polyamide-acids having improved solubility and processing characteristics and high glass transition temperatures are provided, having incorporated into the polymeric chain the novel aromatic dianhydride compound 4,4'-bis[2-(3,4-dicarboxyphenyl) hexafluoroisopropyl] diphenyl dianhydride. The polyamide-acids and polyimides are prepared by reacting the 12F-Diphenyl DA with aromatic or aliphatic diamines. It has been found that the polyimides of this invention have improved solubility characteristics, good dielectric properties while at the same time exhibiting relatively high glass transition temperatures, and superior thermal and thermo-oxidative stability. The polymers may be processed into films, fibers or compression molded or fabricated into composites at moderate temperatures and pressures.Type: GrantFiled: August 6, 1990Date of Patent: October 29, 1991Assignee: Hoechst Celanese CorporationInventors: Werner H. Mueller, Rohitkumar H. Vora
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Patent number: 5043411Abstract: The present invention generally relates to a thermosettable cyanate ester resin composition which contains a fortifier that is the reaction product of an epoxy and an aromatic reactant selected from an aromatic amine and an aromatic amide. Thermoset cyanate ester resin compositions of the present invention have improved flexural strength and/or flexural modulus. The compositions of the present invention may be used to prepare circuit boards or molded parts.Type: GrantFiled: May 14, 1990Date of Patent: August 27, 1991Assignee: Nova Petrochemicals Inc.Inventors: Kam W. Ho, Adrian Cassola
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Patent number: 5041516Abstract: Dendritic macromolecules and a novel convergent process for producing the same are disclosed. The convergent process enables the accurate control and design of the surface functionality of the macromolecule.Type: GrantFiled: June 21, 1989Date of Patent: August 20, 1991Assignee: Cornell Research Foundation, Inc.Inventors: Jean M. J. Frechet, Craig J. Hawker, Athena E. Philippides
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Patent number: 5028237Abstract: Graft polymers which are obtainable from(A) 2-30% by weight of an addition product from alkylene oxide onto an aliphatic alcohol which is at least trihydric having 3 to 10 carbon atoms and(B) 70-98% by weight of a grafted-on monomer mixture of(1) 20 to 50% by weight of an N-substituted or N-unsubstituted acrylamide or methacrylamide and(2) 50 to 80% by weight of an N-vinyl-substituted amide or of a vinyl ester, derived in each case from a saturated aliphatic monocarboxylic acid,where the sums of (A) and (B), and (1) and (2) in each case add up to 100%.These novel graft polymers are suitable as dyeing assistants, particularly as padding assistants or liquor binders when dyeing cellulose fibre materials.Type: GrantFiled: September 25, 1990Date of Patent: July 2, 1991Assignee: Ciba-Geigy CorporationInventor: Hans-Ulrich Berendt
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Patent number: 4954584Abstract: Thermosetting resin compositions comprise a mixture of a 1-arylcyclobutenecarboxylate ester of a glycidyloxy compound having at least two glycidyloxy substituents and at least one polymerizable monomer having at least two substituents with multiple valence bonds between adjacent atoms. Also claimed are the cured products obtained by heating such compositions.Type: GrantFiled: June 12, 1989Date of Patent: September 4, 1990Assignee: Shell Oil CompanyInventor: Pen-Chung Wang
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Patent number: 4942215Abstract: A thermosetting liquid moulding composition comprising:(a) a polyepoxide containing at least two epoxide groups per molecule;(b) a tricarboxylic acid definable by the general formula: ##STR1## where: R.sup.1, R.sup.2 and R.sup.3 have the meaning given in the description; and(c) a diacarboxylic acid anhydride.This composition can be transformed by liquid moulding into manufactured articles particularly useful in the electrical sector.Type: GrantFiled: November 18, 1988Date of Patent: July 17, 1990Assignee: Enichem Synthesis S.p.A.Inventors: Alberto Greco, Luigi Raisa
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Patent number: 4939210Abstract: A process for producing a parabanic acid ring-containing polymer, which comprises reacting a polycarbodiimide polymer with oxalyl chloride and then treating the reaction product with water.Type: GrantFiled: February 17, 1989Date of Patent: July 3, 1990Assignee: Nisshinbo Industries, Inc.Inventors: Yasuo Imashiro, Satoshi Amano
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Patent number: 4897460Abstract: The present invention relates to an one-packed type epoxy resin composition. An object of the present invention is to provide epoxy resin composition which have good compatibility with epoxy resin, exhibit excellent stability during storage and heat stability, can be used at about room temperature over a long period of time and can be rapidly cured at a relatively low temperature upon heating.Type: GrantFiled: January 28, 1987Date of Patent: January 30, 1990Assignee: Ajinomoto Co., Inc.Inventors: Hiroshi Sakamoto, Koji Takeuchi
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Patent number: 4868277Abstract: Disclosed is a novel class of linear segmented non-elastomeric thermoplastic polyesteramides. The polymers are easily obtained by reacting a carboxylic acid-terminated prepolymer (derived by reacting at least a two-molar proportion of a dicarboxylic acid with a polymeric diol of molecular weight 400 to 6000), a dicarboxylic acid, and a diisocyanate.The polymers so obtained have nylon-like properties, particularly nylon 11 or 12, but are characterized by superior high temperature properties therefrom. At the same time, they have excellent toughness and very low water absorption characteristics.Type: GrantFiled: August 18, 1988Date of Patent: September 19, 1989Assignee: The Dow Chemical CompanyInventor: Augustin T. Chen
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Patent number: 4857599Abstract: Dense star polymers on immobilized cores are very useful as ion-exchange resins and chelation resins. For example, an aminated form of chloromethylated styrene/divinyl benzene copolymer can be employed as an immobilized core compound and reacted successively with methyl acrylate via a Michael addition reaction and then with ethylenediamine to form a first generation dense star polymer or dendrimer. These reactions can then be repeated to form second and third generation dendrimers.Type: GrantFiled: February 8, 1988Date of Patent: August 15, 1989Assignee: The Dow Chemical CompanyInventors: Donald A. Tomalia, James R. Stahlbush
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Patent number: 4851484Abstract: An anhydride-cured epoxy resin (epoxy resin+anhydride curing agent+catalyst) may be fortified (i.e. increased in strength and modulus without being made brittle) by the addition of a carboxylic acid and the reaction product of a carboxylic acid anhydride and a substituted aromatic amine. Strengths as high as 125 MPa and moduli as high as 3500 MPa have been attained, as well as elongations up to 6% and an increase in the ability of the plastic to yield before fracture (ductility), compared to 80 MPa strength, 3000 MPa modulus and 2.4% elongation for the unfortified system (strengths and moduli are tensile).Type: GrantFiled: March 3, 1988Date of Patent: July 25, 1989Assignee: Canadian Patents & Development Ltd.Inventors: Andrew Garton, Paul D. McLean
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Patent number: 4841016Abstract: An additive composition for enhancing curing and color clarity properties of polyester resins. The additive comprises from about 50 to 75 parts by weight of a mercaptan, and from about 50 to about 25 parts by weight of a quaternary ammonium salt. From about 0.5 to about 25 parts by weight of a polymerization initiator can be incorporated into the additive when the polyester resin is utilized as a gel coat. Resinous compositions formulated with the additive consist essentially of from about 50 to about 99.5 parts by weight of a polyester resin, from about 0.5 to about 35 parts by weight of the mercaptan, from about 0.1 to about 15 parts by weight of the quaternary ammonium salt, and a minor effective amount of an oxidizing agent for the polyester resin.Type: GrantFiled: March 16, 1988Date of Patent: June 20, 1989Inventor: Bill R. Edwards