Polymerizing In The Presence Of A Specified Material Patents (Class 528/336)
-
Patent number: 6103862Abstract: A novel compound of N-substituted aromatic polyamide is prepared by introducing an aralkyl group to the N-position of an aromatic polyamide by metalizing the aromatic polyamide, then reacting the metalized polyamide with an aralkyl halide.Type: GrantFiled: December 30, 1997Date of Patent: August 15, 2000Assignee: Samsung Display Devices Co., Ltd.Inventor: Seong-hee Noh
-
Patent number: 6103863Abstract: A two-step process for the production of polyamides from .alpha.,.omega.-dinitriles and .alpha.,.omega.-diamines involving the catalytic hydrolysis of the .alpha.,.omega.-dinitrile by addition of water with simultaneous purging of the reactor (i.e., venting of ammonia and water vapor) in the first step followed by polymerization by addition of the .alpha.,.omega.-diamine to the hydrolysate in the second step. Such a process is particularly useful in the production of poly(hexamethylene adipamide), i.e., nylon 6,6, from adiponitrile and hexamethylene diamine using lower catalyst levels during hydrolysis and resulting in reduced levels of bis(hexamethylene)triamine, BHMT, in the polymer.Type: GrantFiled: December 22, 1998Date of Patent: August 15, 2000Assignee: E. I. Dupont de Nemours & CompanyInventors: Richard Allen Hayes, David Neil Marks, Maria Van Eijndhoven
-
Patent number: 6100370Abstract: The invention concerns a softener-free polyamide prepared by polycondensation and/or polymerization of polyamide-forming monomers, wherein it was obtained by adding 5-50 wt. % of a dimer diol with a molecular weight within the range of 400-1000 and/or corresponding OH-terminated polyesters.Type: GrantFiled: May 6, 1999Date of Patent: August 8, 2000Assignee: Ems-Chemie AGInventors: Heinz Hoff, Ulrich Wolf
-
Patent number: 6087470Abstract: The new diamine, "3,3',5,5'-tetramethyl-2,2-bis[4-(4-amino-phenoxy)phenyl]propane" was synthesized and used to prepare high performance soluble engineering plastics by polycondensation. The polymer can be polyamides, polyimides or poly(amide-imide)s. These polymers exhibit excellent solubility, processability, heat resistance and mechanical performance.Type: GrantFiled: June 30, 1998Date of Patent: July 11, 2000Assignee: National Science Council of Republic of ChinaInventors: Der-Jang Liaw, Been-Yang Liaw
-
Patent number: 6084056Abstract: A process for the hydrolysis of a dinitrile (e.g., adiponitrile) utilizing from 0.1 to 500 mmoles of catalyst (e.g., a mixture of phosphorous acid and calcium hypophosphite) per mole of the dinitrile and in the presence of from 0.01 to 0.5 moles of a dicarboxylic acid cocatalyst (e.g., adipic acid) followed by addition of a diamine (e.g., hexamethylenediamine) and heating to produce polymerization. Such a process is particularly useful in the production of nylon 6,6 having a low BHMT content and improved melt stability.Type: GrantFiled: December 22, 1998Date of Patent: July 4, 2000Assignee: E. I. Dupont de Nemours & CompanyInventors: Richard Allen Hayes, David Neil Marks, Maria de Jesus Van Eijndhoven
-
Patent number: 6075117Abstract: A process for the hydrolysis of a dinitrile (e.g., adiponitrile) utilizing a dicarboxylic acid (e.g., adipic acid) as the sole catalyst followed by addition of a diamine (e.g., hexamethylenediamine) and heating to produce polymerization. Such a process is particularly usefull in the production of nylon 6,6 having a low BHMT content and improved melt stability.Type: GrantFiled: December 21, 1998Date of Patent: June 13, 2000Assignee: E.I. Dupont De Nemours & CompanyInventors: Richard Allen Hayes, David Neil Marks, Maria Van Eijndhoven
-
Patent number: 6072023Abstract: Polyamides and process for their preparation comprising eitherA) epoxidizing an unsaturated or partially hydrogenated fatty acid glyceride;B) transesterifying the epoxidized glyceride with a C.sub.1-4 alkanol to obtain epoxidized fatty acid C.sub.1-4 alkyl esters;C) ring opening and dimerizing the epoxidized fatty acid C.sub.1-4 alkyl esters; andD) reacting the dimerized fatty acid C.sub.1-4 alkyl esters with a polyamine to obtain a polyamide; orA) transesterifying an unsaturated or partially hydrogenated glyceride with a C.sub.14 alkanol to obtain olefinically unsaturated fatty acid C.sub.1-4 alkyl esters;B) epoxidizing the unsaturated fatty acid C.sub.1-4 alkyl esters;C) ring opening and dimerizing the epoxidized fatty acid C.sub.1-4 alkyl esters; andD) reacting the dimerized fatty acid C.sub.1-4 alkyl esters with a polyamine to obtain a polyamide.Type: GrantFiled: July 21, 1998Date of Patent: June 6, 2000Assignee: Henkel CorporationInventors: Setsuo Sato, Ramiro Carielo Bueno, Wanderson Bueno De Almeida
-
Patent number: 6069228Abstract: Disclosed is a process for the preparation of polyamide polymers via prepolymer formation in a reactor system comprising a reactor, flasher and separator, crystallization of the prepolymer under controlled temperature conditions and the subsequent conversion of these crystallized prepolymers to high molecular weight polymer.Type: GrantFiled: August 17, 1998Date of Patent: May 30, 2000Assignee: E. I. du Pont de Nemours and CompanyInventors: Albert Walter Alsop, Elwood Neal Blanchard, Jeffrey D. Cohen, John Maurice Iwasyk, Clara Young Lin, David Neil Marks, Jan M. Stouffer
-
Patent number: 6063862Abstract: Disclosed is a process for producing a glass-polyamide composite comprising bringing into contact or mixing (A) an aqueous solution containing water, water glass, and a diamine and (B) an organic solution containing an organic solvent and a dicarboxylic acid halide to carry out polyamide formation and polycondensation of water glass simultaneously.Type: GrantFiled: March 10, 1999Date of Patent: May 16, 2000Assignee: Dainippon Ink and Chemicals, Inc.Inventors: Satoshi Idemura, Kazutoshi Haraguchi
-
Patent number: 6054553Abstract: Polymers having recurring succinyl units are obtained by an improved process by reaction of A, an unsaturated C.sub.4 -dicarboxylic acid or a derivative thereof, with B, a nitrogen-donating compound, in a first reaction step to give a reaction mixture comprising at least one low molecular weight reaction product, and subsequent continuous feeding of the reaction mixture into a continuously operated reactor to give the polymer in a second reaction step. In a further embodiment the invention refers to polymers having recurring succinyl units prepared by reaction of an unsaturated C.sub.4 -dicarboxylic acid or a derivative thereof with a nitrogen-donating compound in a first reaction step and subsequent feeding of the reaction mixture, without intermediate isolation, into an optionally continuously operated reactor, with removal of water, and treatment of the reaction mixture at a temperature of 140 to 350.degree. C.Type: GrantFiled: November 12, 1996Date of Patent: April 25, 2000Assignee: Bayer AGInventors: Torsten Groth, Winfried Joentgen, Frank Dobert, Klaus-Peter Heise, Thomas Menzel, Ursula Pentling, Hans-Georg Pirkl, Paul Wagner, Joergen Weinschenck
-
Patent number: 6025459Abstract: A method of forming a polyamide from a corresponding nylon salt material comprises providing a reaction mixture comprising a nylon salt and carbon dioxide; and then condensing the nylon salt in the carbon dioxide to form a polyamide and water. A method of forming a polyamide comprises providing a reaction mixture containing at least one lactam monomer and carbon dioxide; and then polymerizing the lactam monomer in the carbon dioxide to form a polyamide.Type: GrantFiled: February 12, 1997Date of Patent: February 15, 2000Assignee: The University of North Carolina at Chapel HillInventors: Joseph DeSimone, Ramone Givens, Yizeng Ni
-
Patent number: 6011131Abstract: Process for the preparation of polyamides comprising the steps of A) reacting a soybean oil condensate obtained from the deodorization of refined soybean oil and which contains less than 30% by weight of free and esterified oleic acid based on the total weight of free and esterified fatty acids in said condensate, with a C.sub.1-4 alkanol in the presence of a zinc oxide catalyst to convert free fatty acids and fatty acid glyceride esters to fatty acid C.sub.1-4 alkyl esters;B) removing excess C.sub.1-4 alkanol, volatile reaction by-products, water, and the zinc oxide catalyst from the resulting reaction mixture;C) heating the reaction mixture from step B) under vacuum to obtain a distillate of fatty acid C.sub.1-4 alkyl esters;D) separating the distillate from step C) into a fraction containing mostly C.sub.16-18 saturated fatty acid C.sub.1-4 alkyl esters and a second fraction containing mostly C.sub.16-18 unsaturated fatty acid C.sub.1-4 alkyl esters wherein the oleic acid C.sub.Type: GrantFiled: May 19, 1998Date of Patent: January 4, 2000Assignee: Henkel CorporationInventors: Setsuo Sato, Hercules Peloggia, Tracy Hunt, Joerg Schwarzer, Ramiro Carielo Bueno, Roger A. Lovald
-
Patent number: 6011134Abstract: An improved method for manufacturing poly(hexamethylene adipamide), i.e. nylon 6,6, by reacting monomethyl adipate with hexamethylenediamine in an approximately equimolar ratio in the presence of water at a temperature of 100 to 165.degree. C. while simultaneous distilling off of a stoichiometric amount of methanol. The resulting aqueous intermediate product is then heated to 200 to 260.degree. C. while distilling off substantially all water at a pressure of 150 to 250 psig (1.03 .times.10.sup.6 to 1.72 .times.10.sup.6 Pa) followed by reducing the pressure to atmospheric pressure and increasing the temperature to 270 to 280.degree. C. to polycondense the distillate residue. Such a process is useful in producing high purity commercial grade poly(hexamethylene adipamide) that advantageously avoids problems caused by N-methylation of the polyamide.Type: GrantFiled: January 30, 1998Date of Patent: January 4, 2000Assignee: E. I. du Pont de Nemours and CompanyInventors: David Neil Marks, Samuel Livingston Lane
-
Patent number: 6001957Abstract: A thermoplastic resin composition that includes a polyetherimide resin and a phosphorus-containing stabilizer that exhibits a low volatility. The thermoplastic resin composition exhibits improved melt stability and improved resistance to thermal degradation.Type: GrantFiled: December 23, 1997Date of Patent: December 14, 1999Assignee: General Electric CompanyInventors: Robert Puyenbroek, Darryl Nazareth, Robert Hayes, Yimin Jin
-
Patent number: 5998492Abstract: Disclosed are methods of producing super-absorbing polymeric networks of polyaspartates from crosslinked polysuccinimide. In one preferred aspect, polysuccinimide is first reacted with an organic crosslinking agent, preferably an organic base containing at least two primary amine groups, to form a gelled crosslinked polysuccinimide. The gelled crosslinked polysuccinimide is then base hydrolyzed to a gelled polymeric network of polyaspartate and deswollen with at least one liquid alcohol to a polymeric network of polyaspartate which demonstrates super-absorbing capability in water and in electrolyte solution. Super-absorbing polymeric networks of polyaspartates can also be produced in a single reaction vessel by sequentially crosslinking a polysuccinimide with an organic crosslinking agent in an aqueous reaction medium, optionally containing a mineral acid, and then hydrolyzing the crosslinked polysuccinimide to produce a polymeric network of polyaspartate.Type: GrantFiled: October 26, 1998Date of Patent: December 7, 1999Assignee: Donlar CorporationInventors: Joseph P. Haar, Jr., Robert J. Ross
-
Patent number: 5998572Abstract: Methods and devices for controlling the oxidation of a hydrocarbon to an acid by regulating the temperature hold-up time, and conversion in consecutive reaction zones. The temperature in the consecutive reaction zones progressively decreases, while the hold-up time increases. Preferably, the conversion also increases. One of the major advantages of the methods and devices of the present invention is that an outstanding balance between productivity and selectivity/yield of the desired acid may be achieved. In this respect high yields and selectivities may be obtained without sacrificing productivity.Type: GrantFiled: May 12, 1998Date of Patent: December 7, 1999Assignee: RPC Inc.Inventors: Ader M. Rostami, Mark W. Dassel, Eustathios Vassiliou, David C. DeCoster
-
Patent number: 5994494Abstract: An antisettling agent for aqueous paints giving excellent settling-preventing properties to aqueous paints is provided. The antisettling agent is produced by the following process: A polyamide, which is obtained by reacting a primary diamine having 2 to 12 carbon atoms with, in an amount excess to the diamine, a dimer dicarboxylic acid obtained by polymerizing an unsaturated fatty acid (common name: dimer acid) or a mixture of a dimer acid with another dicarboxylic acid having 3 to 21 carbon atoms and/or a monocarboxylic acid having 2 to 22 carbon atoms, is neutralized with a neutralizing base, and then the neutralized polyamide is dispersed in a medium mainly composed of water.Type: GrantFiled: May 8, 1998Date of Patent: November 30, 1999Assignee: Kusumoto Chemicals, Ltd.Inventor: Toshimitsu Wakui
-
Patent number: 5990270Abstract: A polyamide composition which is amorphous and transparent, which has reduced flammability, and which has reduced migration of flame-retardant additive so that it is film-free, includes at least one polyamide which contains cycloaliphatic monomer units and which is amorphous and transparent; and a flame-retardant additive which is present in an amount effective to reduced flammability of the polyamide composition, which is dissolved in the at least one polyamide, and which is at least one alkyl phosphonic acid compound having a general formula: ##STR1## wherein R and R' each represent, independent of each other, an alkyl group having from 1 to 4 carbon atoms, and x=0 or 1. An article molded from this composition is transparent, has reduced flammability, and has reduced migration of flame-retardant additive so that it is film-free.Type: GrantFiled: October 30, 1998Date of Patent: November 23, 1999Assignee: Ems- Inventa AGInventors: Hans Dalla Torre, Manfred Hewel
-
Patent number: 5986041Abstract: A polyetheresteramide compound and the method of preparing it comprise: a polyether compound containing a diamino group at the end mixed with a diacid and a diol, and being polymerized and condensed to form a polyetheresteramide compound. This polyetheresteramide is a durable anti-static resin. In addition to the anti-static property, the polyetheresteramide compound has the physical properties of the original polyester. Thus, the polyetheresteramide compound can be added into an anti-static resin and applied in general resin industry, special chemical and spinning industries. The anti-static products, such as the anti-static thin plate, anti-static bag, IC cover tape, anti-static clothes, and dustless clothes, or even broadly applied in electronic communication, semiconductor, and optoelectronic manufactures.Type: GrantFiled: June 19, 1997Date of Patent: November 16, 1999Assignee: Industrial Technology Research InstituteInventors: Ling-Yu Cheng, Yuung-Ching Sheen, Tsai-Wie Tseng, Juh-Shyong Lee
-
Patent number: 5981692Abstract: This invention relates to high temperature, semi-crystalline, semi-aromatic nylon terpolymers with improved shrinkage resistance, made from terephthalic acid (TA), hexamethylene diamine (HMD) and/or 2-methyl pentamethylene diamine (2-MPMD) and another aliphatic dicarboxylic acid as monomers. These polymers display superior % TD (Transverse Direction) annealing shrinkage, as well as very good balance of mechanical performance as high temperature nylons.Type: GrantFiled: May 15, 1997Date of Patent: November 9, 1999Assignee: Du Pont Canada Inc.Inventor: Christian Leboeuf
-
Patent number: 5973105Abstract: The invention concerns a process for continuously preparing polyamide 6 with a low dimer content from .epsilon.-caprolactam (fresh lactam) and/or from recycled lactams from extraction and melt-demonomerizing stages. In a plurality of process stages the recycled lactam and/or fresh lactam is hydrolyzed under pressure in the fusible state with water contents of between 3 and 15% and temperatures ranging from 220.degree. C. to 280.degree. C. With a lower constant water content being set, the molten polyamide is then fed to the polymerization process in a further pressure stage incorporating a gas chamber.Type: GrantFiled: February 27, 1998Date of Patent: October 26, 1999Assignee: Polymer Engineering GmbHInventors: Karlheinz Wiltzer, Peter Lausmann, Baldur Ebert
-
Patent number: 5965689Abstract: The invention relates to electrical and electronic components made of a polyamide composition and possessing an improved resistance under soldering conditions, particularly when the surface mounting technique is used. This is achieved by using a polyamide composition whose main chain essentially consists of units derived from aliphatic dicarboxylic acids and diamines or .alpha.,.omega.-amino acids, and in which 1-40% of the chain units are derived from 1,6-cyclohexanedicarboxylic acid and an aliphatic diamine, or from 1,4-cyclohexanediamine and an aliphatic dicarboxylic acid.As a result, the temperature at which blisters are formed during soldering by the infrared method is 20-30.degree. C. higher than in the case of the homo-polyamide.Type: GrantFiled: March 19, 1998Date of Patent: October 12, 1999Assignee: DSM N.V.Inventors: Cornelis E. Koning, Petronella M. Knape, Robert M. Leeuwendal, Josefina M. A. Schiffer
-
Patent number: 5962628Abstract: Improved high temperature polyamides, and particularly partially-aromatic polyamides, containing less than about 40 .mu.eq/g carboxylic acid endgroups. When stabilized with a copper-containing thermal stabilizer, the polyamides exhibit improved thermal oxidative stability.Type: GrantFiled: December 17, 1997Date of Patent: October 5, 1999Assignee: BP Amoco CorporationInventor: Robert G. Keske
-
Patent number: 5959069Abstract: Polyamides are built up from, as fundamental building blocks (a), lactams or aminocarboxylic acids or mixtures of these,as fundamental building blocks (b), from 1 to 50 .mu.mol of at least tribasic amines or carboxylic acids per gram of polyamide,as fundamental building blocks (c), dibasic carboxylic acids or amines andas fundamental building blocks (d), monobasic carboxylic acids or amines,where (c) and (d) are carboxylic acids if (b) are amines, and (c) and (d) are amines if (b) are carboxylic acids,the equivalents ratio of the functional groups of (b) to the functional groups of (c) and (d) together is from 60:40 to 40:60 andthe equivalents ratio of the functional groups of (c) to the functional groups of (d) is from 15:85 to 60:40.Type: GrantFiled: December 23, 1997Date of Patent: September 28, 1999Assignee: BASF AktiengesellschaftInventors: Alexander Gluck, Walter Gotz, Stefan Grutke, Martin Laun, Volker Warzelhan
-
Patent number: 5955569Abstract: An improved method for increasing the relative viscosity and molecular weight of a polyamide polymer (such as nylon 6,6, nylon 6, and the like) while in the solid state involving the use of a phosphorus-containing catalyst (such as 2(2'-pyridyl) ethyl phosphonic acid or the like) in combination with an oxygen free gas characterized by a low dew point (typically below 30.degree. C. and preferably below -30.degree. C.). The combination of affording commercial operation at greater through put at lower temperature. Such a process is of particular value during the production of terpolyamide and multipolyamide polymer intended for use in colored nylon fiber manufacture.Type: GrantFiled: November 27, 1996Date of Patent: September 21, 1999Assignee: E.I. du Pont de Nemours and CompanyInventors: Ramdas Dujari, Gregory D. Cramer, David Neil Marks
-
Patent number: 5948880Abstract: A process is provided for preparing a dispersion of a polyamide in water, said process comprising:forming a solution of a polyamide having an acid value of greater than about 2 in an organic solvent to form a solution of said polyamide in said solvent, said polyamide and said solvent being at a temperature below the softening point of said polyamide during said dissolving, said solution further comprising a surfactant, wherein at least a portion of the acid value of said polyamide is neutralized,adding sufficient water to said solution with mixing to form an oil-in-water dispersion, the temperature of said solution and said water being below the softening point of said polyamide during said adding, andremoving at least a major amount of said organic solvent from said oil-in-water dispersion. The resulting dispersion is useful in preparing a coating of the polyamide, which coating is useful as an adhesive.Type: GrantFiled: May 8, 1997Date of Patent: September 7, 1999Assignee: Henkel CorporationInventors: Stephen A. Fischer, Chase J. Boudreaux, Michael S. Wiggins
-
Patent number: 5939512Abstract: A composition comprising a polyamide, a polyolefinic modifier, and an ethylene/acrylic acid copolymer.Type: GrantFiled: February 28, 1998Date of Patent: August 17, 1999Assignee: AllliedSignal Inc.Inventors: Jay A. Gervasi, Harold W. Tuller, Wesley F. Smith, Charles W. Alpaugh
-
Patent number: 5939519Abstract: The crystallinity of poly(1,4-cyclohexanedimethyl 1,4-cyclohexanedicarboxylate) is enhanced by the incorporation of amide units, preferably derived from such compounds as 1,6-bis(4-carbomethoxycyclohexylcarboxamido)hexane. Crystallization temperatures increase, as do heats of crystallization.Type: GrantFiled: May 11, 1998Date of Patent: August 17, 1999Assignee: General Electric Co.Inventor: Daniel Joseph Brunelle
-
Patent number: 5932689Abstract: A formaldehyde-free curable composition useful for binding nonwovens comprises(a) a polyacid comprising at least two carboxylic acid groups, anhydride groups, or salts of the polyacid thereof;(b) an active hydrogen compound containing at least two active hydrogen groups selected from the group consisting of hydroxyl, primary amino, secondary amino, and mixtures thereof; and(c) one or more compounds selected from the group consisting of cyanamide, dicyandiamide, 1,2-mono- or di-(C.sub.1 -C.sub.6 alkyl) substituted-3-cyanoguanidines such as ethyl-3-cyanoguanidine, 1,2-diethyl-3-cyanoguanidine, and 1,2-diisopropyl-3-cyanoguanidine, and 1,2-mono- or di-(C.sub.6 -C.sub.12 aryl) substituted-3-cyanoguanidines, such as phenyl-dicyandiamide; and, optionally(d) an accelerator;wherein the ratio of the number of equivalents of said carboxylic acid groups, anhydride groups, or salts thereof to the number of equivalents of said active hydrogen groups is from 1/0.Type: GrantFiled: April 22, 1998Date of Patent: August 3, 1999Assignee: Rohm and Haas CompanyInventors: Charles Thomas Arkens, Johnny Chung Nin U
-
Patent number: 5922830Abstract: A highly hygroscopic polyamide fiber formed from a polyamide compound containing a polyvinylpyrrolidone (in an amount of 3-15 wt %) which is synthesized in isopropyl alcohol as a solvent, contains pyrrolidone in an amount less than 0.1 wt %, and has a K-value of 20-70. This fiber contains pyrrolidone in an amount less than 0.1 wt % of the amount of polyvinylpyrrolidone. This fiber is characterized by a yellowness index lower than 10 before dyeing, a large difference between the maximum moisture absorptivity and the standard moisture absorptivity, and a low content of water-soluble components that are subject to leaching.Type: GrantFiled: March 25, 1997Date of Patent: July 13, 1999Assignee: Toray Industries, Inc.Inventors: Naoyuki Kinoshita, Tetsuya Katoh, Yumiko Sawai
-
Patent number: 5919892Abstract: This invention relates to polyamic acids and to methods for converting polyamic acid into polyimidebenzoxazole polymers. The polyamic acids are prepared by reacting a dianhydride with a diaminobenzoxazole under conditions sufficient to form polyamic acid with an inherent viscosity of greater than 2.0 dL/gram, as measured at 0.2 g/dL in N-methyl-pyrrolidinone at 25.degree. C. The polyamic acids are converted to polyimidebenzoxazole in the form of films, fiber, coatings and the like using thermal and chemical processes.Type: GrantFiled: October 31, 1994Date of Patent: July 6, 1999Assignee: The Dow Chemical CompanyInventors: Wen-Fang Hwang, William J. Harris
-
Patent number: 5917004Abstract: The invention is relative to weather-resistant polyamides and to methods of their production in which the polymerization or polycondensation of the polyamide-forming monomers (I) is carried out in the presence of 0.02 to 0.7% by weight 4-amino-2,2,6,6-tetraalkylpiperdine (II), 0 to 0.5% by weight of an aliphatic or cycloaliphatic diamine (III) carrying a primary and a tertiary amino group and 0.02 to 0.7% by weight of a 2,6-dialkylphenol (IV) functionalized in 4-position to the OH group and with the formula ##STR1## in which R.sup.1 and R.sup.2 are the same or different alkyl groups with 1 to 6 C atoms, R.sup.3 is either a hydrogen atom or a methyl group, functional group A represents either a free carboxyl group or a carboxyl group esterified with C.sub.1 -C.sub.Type: GrantFiled: July 9, 1997Date of Patent: June 29, 1999Assignee: EMS-Inventa AGInventor: Hanns-Jorg Liedloff
-
Patent number: 5907028Abstract: A method for making polyesterimide varnishes by polycondensing and imidat a mixture of trimellitic anhydride, 4,4'-diamino-diphenyl methane, glycol, dimethyl terephthalate and glycerol or tris(hydroxyethyl) isocyanurate or optionally p,p'-dihydroxy-diphenyl-dimethyl methane, with a transesterification catalyst added, and subsequently dissolving the resulting polyesterimide resin in an organic solvent with a crosslinking catalyst added, characterized by the feature that 2-methyl-1,3-propanediol and/or 2-butyl-2-ethyl-1,3-propanediol is used as the glycol or as one of the glycols.Type: GrantFiled: December 9, 1997Date of Patent: May 25, 1999Assignee: Instytut Chemii Przemyslowej im. Prof. Ignacego Moscickiego ul.Inventors: Elzbieta Wardzinska, Piotr Penczek, Jadwiga Stanecka, Barbara L/os-Kuchta, Edward Pl/atek, Krystyna Wiaduch, Wojciech Jewl/oszewicz, Tomasz Jarmulski
-
Patent number: 5895809Abstract: The invention relates to a method of producing partially aromatic copolyamides from polymeric esters of aromatic dicarboxylic acids by amidation of the ester groups with diamines, removal of the split-off alcohols or diols and after-condensation of the low-molecular precondensates as well as by the following compounding to polyamide molding materials.Type: GrantFiled: February 13, 1997Date of Patent: April 20, 1999Assignee: EMS-Polyloy GmbHInventors: Harald Wagner, Joachim Ensinger, Erich Krumpschmid
-
Patent number: 5889138Abstract: A process for making stain resistant nylon fibers from a mixture of nylon and highly sulfonated nylon copolymer is disclosed. The highly sulfonated nylon has greater than about 4.0% weight of aromatic sulfonate incorporated into the polymer structure and an unexpectedly low solid particle content as measured by Flow Vision Particle Analyzer and melt filtration studies. Also disclosed is the process and composition of the highly sulfonated nylon copolymer.Type: GrantFiled: January 17, 1997Date of Patent: March 30, 1999Assignee: Solutia Inc.Inventor: Arthur W. Summers
-
Patent number: 5886131Abstract: A method for synthesizing 1,4-bis(4-aminophenoxy)naphthalene and a series of polyamides, polyimides and copoly(amide-imide)s derived from the said compound is disclosed. These polymers possess excellent thermal stability and mechanical strength.Type: GrantFiled: May 30, 1997Date of Patent: March 23, 1999Assignee: China Textile InstituteInventors: Shin Chuan Yao, Jongfu Wu, Kun-Lin Cheng, Wen-Tung Chen
-
Patent number: 5886135Abstract: A process is provided for preparing a dispersion of a polyamide in water, said process comprising:dissolving a polyamide having an amine value of greater than about 2 in an organic solvent to form a solution of said polyamide in said solvent, said polyamide and said solvent being at a temperature below the softening point of said polyamide during said dissolving, said solution further comprising a surfactant and an inorganic alkaline material,adding sufficient water containing an acid to said solution with mixing to form an oil-in-water dispersion, the temperature of said solution and said water being below the softening point of said polyamide during said adding, the amount of said acid being sufficient to neutralize a portion of said inorganic alkaline material, but insufficient to coagulate said polyamide from the resulting oil-in-water dispersion, andremoving at least a major amount of said organic solvent from said oil-in-water dispersion.Type: GrantFiled: May 8, 1997Date of Patent: March 23, 1999Assignee: Henkel CorporationInventors: Stephen A. Fischer, Michael S. Wiggins, Chase J. Boudreaux
-
Patent number: 5874519Abstract: There are disclosed a para-aramid shaped article having a density of 1.390-1.470/cm.sup.3. The para-aramid has an inherent viscosity .eta.inh of at least 3.5 and contains metal ions of 500 ppm or less, the metal ions being combined with acid end groups linked with the para-aramid molecules. The invention also relates to a process for preparing the same. Due to a reduced rate of moisture sorption, a reduced hygroscopic expansion coefficient and excellent mechanical properties, the para-aramid of the present shaped article is suitable for use for reinforcing fiber materials for a composite material and for a magnetic recording medium.Type: GrantFiled: February 3, 1997Date of Patent: February 23, 1999Assignee: Asahi Kasei Kogyo Kabushiki KaishaInventors: Satomi Nishimura, Hideo Kasatani
-
Patent number: 5874518Abstract: An epoxy-modified polyamide resin obtained by reacting a diisocyanate(A) with at least one member selected from the group consisting of a dicarboxylic acid and a tricarboxylic acid anhydride (B) in a nitrogen-containing aprotic solvent to form a polyamide resin intermediate and reacting this polyamide resin intermediate with an epoxy resin (C) in the nitrogen-containing aprotic solvent. This epoxy-modified polyamide resin has a high molecular weight and can provide a film with excellent heat resistance and flexibility, and its composition can be used as a coating material, adhesive or such in the form as it is.Type: GrantFiled: July 15, 1994Date of Patent: February 23, 1999Assignee: Hitachi Chemical Company, Ltd.Inventors: Kenji Suzuki, Yoshiyuki Mukoyama, Toshihiko Ito
-
Patent number: 5859180Abstract: Process for the solid state polycondensation of polyamide resins by the use in the polycondensation reactor of a quantity of an inert gas such that the ratio by weight between the solid capacity/h at the reactor outlet and that one of gas fed into the reactor is lower than 0.5.Type: GrantFiled: October 10, 1997Date of Patent: January 12, 1999Assignee: Sinco Engineering S.p.A.Inventors: Dario Giordano, Riccardo Bianchi
-
Patent number: 5859175Abstract: Process for the preparation of polyether-amide solutions, steam-sterilizable dialysis membranes obtainable using the polyether-amide solutions, and a process for the production of these membranes.Polycondensation of one or more dicarboxylic acid derivatives of the formula I ##STR1## with one or more aromatic diamines of the formula II ##STR2## and, if appropriate, m-phenylenediamine, in aprotic polar solvents is known.As a result of passing ammonia, in an amount sufficient to neutralize the HCl formed, into the polymer solution obtained after the end of the polycondensation and filtering off the ammonium chloride formed, it is possible to prepare neutral, salt-free and particularly storage-stable polyether-amide solutions which can be further processed to membranes without isolation of the polymer. The resulting membranes are steam-sterilizable, chemically and thermally stable and show efficiency data in the region of that of good high-flux dialysis membranes.Type: GrantFiled: December 20, 1996Date of Patent: January 12, 1999Assignee: Hoechst AktiengesellschaftInventors: Karsten Blatter, Reinhard Wagener, Carl Martin Bell, Hermann Josef Gohl
-
Patent number: 5859177Abstract: The process for single-stage postcondensation of a polycondensate in a fluidized bed reactor (1) includes feeding the polycondensate through the fluidized bed reactor (1); circulating a main stream of nitrogen carrier gas through the fluidized bed reactor; withdrawing a fractional stream at a temperature of from 20.degree. to 230.degree. C. from the main stream of the nitrogen carrier gas; passing the fractional stream through a water-filled gas scrubber column (15) so as to form a conditioned stream of the nitrogen carrier gas with a predetermined dew point between 10.degree. to 80.degree. C.; and returning the conditioned stream to the main stream. In preferred embodiments the polycondensate is allowed to cool during a cool-down stage at an end of the postcondensation and the withdrawal of the fractional stream from the main stream is halted, but the circulating of the main stream through the fluidized bed reactor is continued during the cool-down stage.Type: GrantFiled: August 26, 1997Date of Patent: January 12, 1999Assignee: Rhodia Filtec AGInventors: Luzius Berger, Hans Stehr, Niklaus Zemp
-
Patent number: 5859179Abstract: A method of preparing superabsorbent polymer as crosslinked polyaspartate salt by reacting polysuccinimide dissolved in organic solvent with crosslinker and reacting the polysuccinimide in situ with neat or a solution of alkali metal hydroxide to form the crosslinked salt.Type: GrantFiled: March 17, 1997Date of Patent: January 12, 1999Assignee: Solutia Inc.Inventor: Yueting Chou
-
Patent number: 5859170Abstract: An aromatic polycarbodiimide containing a siloxane bond in the polymer main chain thereof.The polycarbodiimide can adhere at a low temperature in a short time and has a high heat resistance. The polycarbodiimide has a good adhesive property to an adherend such as semiconductor elements, has a low hygroscopic property and is excellent in the storage stability. Therefore, the polycarbodiimide can be stored for a long period of time at normal temperature.Type: GrantFiled: May 28, 1997Date of Patent: January 12, 1999Assignee: Nitto Denko CorporationInventors: Michie Sakamoto, Amane Mochizuki, Mashiro Yoshioka
-
Patent number: 5856428Abstract: An aromatic polyamide resin composition composed of two types of aromatic polyamide (A) and (B), where (A) is an aromatic polyamide wherein the molar ratio of aromatic polyamide with respect to the monomer components that constitute the polyamide is 0.4 or greater, and (B) is an aromatic polyamide containing an aromatic monomer as the monomer component that constitutes the polyamide and has a recrystallization temperature that is lower than that of the aromatic polyamide (A), where said aromatic polyamide resin composition has a recrystallization temperature that is 10.degree. C. or more lower than the recrystallization temperature of the aromatic polyamide (A).Merit:The aromatic polyamide composition of the present invention has the high heat resistance characteristic of aromatic polyamides, superior dimensional stability with respect to water absorption, and maintenance of physical stability and chemical resistance, while providing improved molding characteristics.Type: GrantFiled: October 1, 1996Date of Patent: January 5, 1999Assignee: E. I. du Pont de Nemours and CompanyInventors: Ryuichi Hayashi, Reiko Koshida
-
Patent number: 5856429Abstract: Amide-containing polymers characterized by the presence of piperazine amide and/or substituted piperazine amide in the polymer chain are used as adsorbents to remove polyphenolic compounds from liquids. The compositions are especially useful in combination with protein removal agents such as silica gel or tannin. The amide-containing polymer compositions (alone or in combination with protein removal agents) are especially useful in the stabilization and/or chillproofing of plant derived liquids or beverages such as beer, wine, fruit juice and vegetable juice.Type: GrantFiled: April 8, 1997Date of Patent: January 5, 1999Assignee: W. R. Grace & Co.-Conn.Inventor: Demetrius Michos
-
Patent number: 5856426Abstract: A para-oriented polyamide porous film comprising a fibril having a diameter of not more than 1.mu., with fibrils planarly arranged as a network or nonwoven fabric and laminated in a layer, the thermal linear expansion coefficient at 200.degree.-300.degree. C. within .+-.50.times.10.sup.-6 /.degree.C. and 30-95% vacant spaces. Also, a battery separator using the porous film. Also, a production process of: (a) forming a film-like material from a solution containing 1-10% of a para-oriented aromatic polyamide having an inherent viscosity of 1.0-2.8 dl/g and 1-10% of a chloride of an alkali metal or an alkali earth metal in a polar amide or polar urea solvent; (b) maintaining the film-like material at not less than 20.degree. C. and not more than -5.degree. C.Type: GrantFiled: November 25, 1996Date of Patent: January 5, 1999Assignee: Sumitomo Chemical Company, LimitedInventors: Tsutomu Takahashi, Tatsuo Tateno, Yoshifumi Tsujimoto
-
Patent number: 5852165Abstract: A crystalline terpolymer polyamide produced from: (a) an equimolar salt of hexamethylenediamine with adipic acid, (b) an equimolar salt of hexamethylenediamine with terephthalic acid, and (c) 12-aminododecanoic acid or .omega.-laurolactam; a polyamide resin composition comprising (A) the terpolymer polyamide and (B) a modified polyolefin; a polyamide resin composition comprising (A) the terpolymer polyamide, (B) the modified polyolefin, and (C) polyamide 12; a polyamide resin composition comprising (A) the terpolymer polyamide and (D) an inorganic filler and/or a flame retardant; and an automotive part comprising a molding one of these terpolymer polyamide and polyamide resin compositions.Type: GrantFiled: May 30, 1995Date of Patent: December 22, 1998Assignee: UBE Industries, Ltd.Inventors: Tatsuo Tsumiyama, Tadahisa Kanayama
-
Patent number: 5847071Abstract: A photosensitive resin composition comprising, as its main ingredient, a poly(amic acid) resin constituted of a diamino compound represented by formula: ##STR1## and optionally used other diamino compound and a tetracarboxylic acid dianhydride as its constituent monomers and/or a poly(amic acid) ester resin obtained by esterifying said poly(amic acid) resin and/or a polyimide resin obtained by a dehydrating or alcohol-eliminating ring-closure reaction of said poly(amic acid) resin or poly(amic acid) ester resin has an excellent developability and a high film strength and can form a relief patter of low thermal expansion.Type: GrantFiled: April 17, 1997Date of Patent: December 8, 1998Assignee: Hitachi, Chemical Co., Ltd.Inventors: Hideo Hagiwara, Makoto Kaji, Hiroshi Nishizawa, Kenji Suzuki, Yasunori Kojima
-
Patent number: 5837803Abstract: A method of producing a polyamide resin by reacting 1 mol of linear polyester resin (as calculated in repeating unit of the linear polyester resin) consisting of at least one dicarboxylic acid component and at least one diol component and having an intrinsic viscosity of not less than 0.2 dl/g with 0.5-1.5 mol of at least one diamine compound in a reaction medium comprising at least one solvent which is selected from the group consisting of hydrocarbons, halogenated hydrocarbons, ethers and acetals, so that the diol component of the linear polyester resin is substituted by the diamine compound to provide the polyamide resin as a reaction product.Type: GrantFiled: March 31, 1997Date of Patent: November 17, 1998Assignee: M & S Research and Development Co., Ltd.Inventor: Seiko Nakano