Imide-containing Reactant Patents (Class 528/170)
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Patent number: 6051677Abstract: Disclosed is a gas separating membrane comprising a layer made of a polycarbodiimide resin having repeating units represented by formula (I): ##STR1## wherein R represents a divalent organic group. The gas separating membrane available according to the present invention has high permeability and separation selectivity as well as excellent permeating performance, and further has excellent heat resistance, chemical resistance and durability.Type: GrantFiled: August 18, 1998Date of Patent: April 18, 2000Assignee: Nitto Denko CorporationInventors: Masatoshi Maeda, Masahiro Yoshioka, Takahiro Fukuoka, Michie Sakamoto, Amane Mochizuki
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Patent number: 6046303Abstract: The invention herein relates to a soluble polyimide resin for a liquid crystal alignment layer and the manufacturing method thereof, wherein a mixture of aliphatic tetracarboxylic acid dianhydrides and aromatic diamine having aliphatic side chains are used to yield a soluble polyimide resin which has superior heat-resistance, solubility, surface hardness, transparency and liquid crystal alignment capacity.The soluble polyimide resin having alkoxy substituents, for a liquid crystal layer, according to the present invention, is manufactured by adding a mixture of dioxotetrahydrofuran 3-methylcyclohexene-1,2-dicarboxylic dianhydride, which is an aliphatic tetracarboxylic acid dianhydride and aromatic tetracarboxylic acid dianhydride to a mixture of aromatic diamine, and said dioxotetrahydrofuran 3-methylcyclohexene- 1,2-dicarboxylic dianhydride is used in the amount of 50 to 99 mol % to the total amount of anhydrides.Type: GrantFiled: September 11, 1998Date of Patent: April 4, 2000Assignee: Korea Research Institute of Chemical TechnologyInventors: Kil-Yeong Choi, Mi-Hie Yi, Moon-Young Jin, Jin-Tae Jung, Jeong-Ghi Koo, Jae-Eun Cho
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Patent number: 6046299Abstract: An ink-jet printing dye-fixing agent is provided which comprises a quaternary cationic polymer having the main chain represented by general formula (1): ##STR1## where R.sub.1, R.sub.2, R.sub.3, and R.sub.4 are independently an aliphatic alkyl group of 1 or 2 carbons; R is an aliphatic alkene group of 1-6 carbons or a phenylene group; and n is an integer of from 3 to 300. A recording paper sheet employing the fixing agent is also provided. This fixing agent has excellent ink dye fixability, and makes ink coloring excellent and improves water resistance of the printed matter.Type: GrantFiled: October 14, 1997Date of Patent: April 4, 2000Assignee: Nicca Chemical Co., Ltd.Inventors: Tatsuo Uchida, Noriaki Kobayashi, Ikuo Kameoka
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Patent number: 6037499Abstract: This invention relates the novel diamines, the polyimide oligomers and the polyimides derived therefrom and to the method of preparing the diamines, oligomers and the polyimides. The thermoplastic polyimides derived from the aromatic diamines of this invention are characterized as having a high glass transition temperature, good mechanical properties and improved processability in the manufacture of adhesives, electronic and composite materials for use in the automotive and aerospace industry. The distinction of the novel aromatic diamines of this invention is the 2,2',6,6'-substituted biphenyl radicals which exhibit noncoplanar conformation that enhances the solubility of the diamine as well as the processability of the polyimides, while retaining a realatively high glass transition temperature and improved mechanical properties at useful temperature ranges.Type: GrantFiled: December 24, 1998Date of Patent: March 14, 2000Assignee: The United States of America as represented by the Administrator of the National Aeronautics and Space AdministrationInventor: Chun-Hua K. Chuang
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Patent number: 6037438Abstract: A cyanate resin composition comprising as essential components a cyanate compound represented by formula (1) or its prepolymer and a curing agent: ##STR1## wherein each of R.sub.1 and R.sub.2 represents a hydrogen atom or an alkyl group having 1 to 5 carbon atoms; A represents an alkyl group having 1 to 3 carbon atoms; i represents an integer of 0 to 3 alone or together with a brominated epoxy compound or a maleimide compound or its prepolymer, said cyanate resin composition giving a cured product having a low-dielectric constant, and a copper-clad laminate composed of a prepreg of said cyanate resin composition and a copper foil.Type: GrantFiled: December 19, 1995Date of Patent: March 14, 2000Assignee: Sumitomo Chemical Company, LimitedInventors: Yasuhiro Endo, Yoichi Ueda, Toshiaki Hayashi, Mitsuhiro Shibata, Shuichi Kanagawa, Shinichiro Kitayama, Hisashi Watabu
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Patent number: 6031068Abstract: The object of the present invention is to provide polyimide composition having such excellent property as low water absorption and low hygroscopic swelling, and a base tape for a TAB carrier tape and a FPC.The another object of the present invention is to provide polyimide composition comprising polyimide consisting of a repeating unit of the general formula (1): ##STR1## The further object of the present invention is to provide a base tape for a TAB carrier tape containing polyimide film made from said polyimide composition as a base film and a FPC containing polyimide film made from said polyimide composition as an insulating material.Type: GrantFiled: October 23, 1998Date of Patent: February 29, 2000Assignee: Kanegafuchi Kagaku Kogyo Kabushiki KaishaInventor: Kohji Okada
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Patent number: 6031061Abstract: A bis(trisubstitutedtrimellitic anhydride) derivative and a polyesterimide for optical communications, the polyesterimide being formed therefrom. The polyesterimide has a high refractive index, so that when using such polyesterimide as a material for a core of an optical fiber, the range of materials that can be selected for the cladding becomes wide. Also, a coating property and adhesion to a substrate are improved, thereby providing a good film forming property and thermal stability. Also, because the polyesterimide can minimize optical loss at a near infrared wavelength range, the polyesterimide is very useful as an optical material in the optical communications field adopting the light of near infrared wavelength.Type: GrantFiled: December 31, 1998Date of Patent: February 29, 2000Assignee: SamSung Electronics Co., Ltd.Inventors: Dong-hack Suh, Sun-young Chung, Tae-hyung Rhee
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Patent number: 6028159Abstract: A polyamideimide for optical communications, having a minimum light absorption loss in a near infrared light wavelength range, high thermal stability and excellent film processibility, and a method for preparing the same are provided. The polyamideimide has a higher refractive index than the conventional fluorinated polyamideimide. Thus, when using such polyamideimide as a material for a core of an optical fiber, the selection range on the material for cladding becomes wide. Also the coating property and adhesiveness to a substrate are improved, thereby providing a good film processibility and heat resistance.Type: GrantFiled: December 31, 1998Date of Patent: February 22, 2000Assignees: SamSung Electronics Co., Ltd., Korea Research Institute of Chemical TechnologyInventors: Dong-hack Suh, Eun-young Chung, Tae-hyung Rhee
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Patent number: 6025460Abstract: The service life of fiber-reinforced polyimide composites in a high temperature oxidative environment is extended by coating with a polyimide coating precursor solution that is synthesized by reacting an aromatic dianhydride with an aromatic diamine in a non-reactive solvent. The reactive solution is heated to a temperature sufficent to reduce its viscosity prior to its use as a coating. Preferably, a mixture of meta-phenylenediamine and para-phenylenediamine is reacted with biphenyldianhydride in n-methyl pyrrolidinone solvent and thereafter heated to between about 50.degree. C. (122.degree. F.) and 150.degree. C. (302.degree. F.) under nitrogen while stirring for a time sufficient to obtain a polyamic acid polyimide precursor coating solution having a Brookfield viscosity of from about 500 to about 5000 cP and a solids content of from about 5 to about 35 weight percent.Type: GrantFiled: November 4, 1997Date of Patent: February 15, 2000Assignee: Ohio Aerospace InstituteInventors: Anthony M. Mazany, Stanley G. Prybyla
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Patent number: 6025457Abstract: Novel molten-salt type polyelectrolytes are disclosed which contain as an essential ingredient a molten salt polymer obtained by reacting an imidazolium derivative, such as a 1,3-dialkylimidazolium halide, 1,2,3-trialkylimidazolium halide, 1-vinyl-3-alkylimidazolium halide, or 1-vinyl-2,3-alkylimidazolium halide, with an acid monomer, a poly(vinylsulfonamide), trifluoromethanesulfonimide, or the like. The electrolytes show high ionic conductivity at room temperature and have excellent stability to temperature fluctuations and excellent mechanical properties.Type: GrantFiled: December 23, 1997Date of Patent: February 15, 2000Assignee: Shikoku Chemicals CorporationInventors: Hiroyuki Ohno, Kaori Ito
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Patent number: 6025070Abstract: The present invention relates to an adhesive film which may be applied to several substrates, including plasticized polyvinyl chloride, such as canvas for trucks. The adhesive film according to the invention comprises at least a barrier layer and an adhesive layer, the barrier layer comprising a (co)polyamide. The adhesive film according to the invention may furthermore comprise a front layer, which is applied to the barrier layer. The barrier layer serves to prevent migration of components from the substrate, the front layer and the adhesive layer.Type: GrantFiled: July 27, 1998Date of Patent: February 15, 2000Assignee: Avery Dennison CorporationInventors: Peter Johannes Heederik, Aren Joost De Man, Frederick Everardus De Grunt
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Patent number: 6018015Abstract: The invention relates to belts made of thermoplastic polymer (A) and comprising a sufficient amount of a polymer (B) to render them antistatic, the said polymer (B) comprising polyethylene glycol blocks. Use is advantageously made of polymers (A) containing polyamide-6 (PA-6) or polyamide-12 (PA-12) blocks and polytetramethylene glycol blocks and polymers (B) containing PA-6 or PA-12 blocks and polyethylene glycol blocks.Type: GrantFiled: November 2, 1998Date of Patent: January 25, 2000Assignee: Elf Atochem S.A.Inventors: Patrick Alex, Jun Yamamoto
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Patent number: 6013759Abstract: A polyamideimide for optical communications, having a minimum optical loss in a near infrared light wavelength range, high thermal resistance and good film processibility, and a method for preparing the same are provided. The polyamideimide is very useful as an optical material in the optical communications field adopting the light of near infrared light wavelength.Type: GrantFiled: December 7, 1998Date of Patent: January 11, 2000Assignee: SamSung Electronics Co., Ltd.Inventors: Dong-hack Suh, Eun-young Chung, Tae-hyung Rhee
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Patent number: 6011118Abstract: A fluororesin sheet is disclosed which comprises an aromatic polyamide pulp and a fluororesin as an essential component, the tensile strength of the fluororesin sheet being not less than about 250 kg/cm.sup.2. A process for producing this fluororesin sheet comprises dispersing the aromatic polyamide pulp and the fluororesin powder in water, adding a coagulating agent which destabilizes the dispersing of the fluororesin powder to the dispersion to deposit the fluororesin powder on the surface of the aromatic polyamide pulp, paper-making, followed by drying to obtain a sheet article, and compressing the sheet article using a roller, followed by heating.Type: GrantFiled: January 30, 1998Date of Patent: January 4, 2000Assignee: Akzo Nobel nvInventors: Kosaku Asagi, Toshiharu Yamabayashi
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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
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Patent number: 6005065Abstract: Ethylenically unsaturated compounds are provided having the structure: ##STR1## wherein R.sub.1 is hydrogen or methyl, R.sub.2 is a divalent linking group having 2 to 20 carbon atoms such as alkylene groups, and R.sub.3 is hydrogen or lower alkyl having 1 to 4 carbon atoms, and when R.sub.3 is hydrogen and R.sub.2 has two carbon atoms R.sub.2 is methyl methylene.Type: GrantFiled: August 21, 1998Date of Patent: December 21, 1999Assignee: PPG Industries Ohio, Inc.Inventors: Steven V. Barancyk, Neil D. McMurdie, James B. O'Dwyer
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Patent number: 6001958Abstract: The invention relates to a crosslinkable polymer for use in optics and non-linear optics, which comprises at least one chromophore, characterized in that it has, on at least two of its ends, at least one reactive end group of a different chemical type from the group predominantly used in polymerization and the preparation of a polymer skeleton. Said reactive end group comprises at least one CC, CN, CS, SS or NS double bond and/or triple bond, and/or an epoxy group and/or a thiol group or a derivative of said groups, and the polymerization groups are selected from at least one of the following groups: urethane, ester, amide, imide, ether, carbon-carbon, sulfide, silane and siloxane, urethane and ester groups being particularly preferred. Application in optical and opto-electronic materials and devices.Type: GrantFiled: October 28, 1996Date of Patent: December 14, 1999Assignee: Flamel TechnologiesInventors: Gilles Hugues Tapolsky, You Ping Chan, Remi Meyrueix, Jean-Pierre Lecomte, Michael Dickens
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Patent number: 6001942Abstract: The invention relates to a silicon-containing polyimide resin comprising (I) 0.1 to 100 mole % of structural units represented by the formula: ##STR1## where Ar.sup.1 is a tetra valent organic group having at least one aromatic ring, R independently represents a monovalent hydrocarbon group free of aliphatic unsaturated bonds, X is selected from an alkyleneoxyalkylene or an alkylene group having 2 or more carbon atoms, Y is an oxygen atom, an alkyleneoxyalkylene group, or an alkylene group having 2 or more carbon atoms, l, m, n are each integers having a value of 1 to 10, p is an integer having a value of 1 to 80, and a is 0 or 1; and (II) 99.9 to 0 mole % of structural units represented by the formula: ##STR2## where Ar.sup.2 is a tetravalent organic group having at least one aromatic ring, and Ar.sup.3 is a divalent organic group having at least one aromatic group.Type: GrantFiled: December 21, 1998Date of Patent: December 14, 1999Assignee: Dow Corning Toray Silicone Co., Ltd.Inventors: Masaaki Amako, Haruhiko Furukawa, Yoshitsugu Morita, Hiroshi Ueki
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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
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Patent number: 5998569Abstract: A composition of matter comprising a polyamic acid/ester having an amide pendant group directly substituting an acid site of the polyamic acid is provided, which composition when cured provides a colored polymer film when the amide group is a chromophore. The resulting polymer which may be applied as a film to semiconductor chips to provide an optically sensitive semiconductor chip comprises a partially imidized polyamic acid wherein an amide pendant group is directly attached to one acid moiety of the polyamic acid and the other acid group imidized with the adjacent amino group of the polyamic acid. The polymers are useful as optical filters on semiconductor chips and for photoresist applications.Type: GrantFiled: March 17, 1998Date of Patent: December 7, 1999Assignee: International Business Machines CorporationInventors: Dennis P. Hogan, Harold G. Linde
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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
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Patent number: 5998545Abstract: The present invention relates to a mixture of polymers (A) having polyamide blocks and copolymers (B) comprising vinylaromatic units and unsaturated carboxylic anhydride units, the quantity of (B) being sufficient for the melt index (or melt flow index, MFI) of the mixture of (A) and (B) to be less than the melt index of (A) alone.It also relates to masterbatches of (A) and (B).Type: GrantFiled: January 22, 1998Date of Patent: December 7, 1999Assignee: Elf Atochem S.A.Inventors: Denis Melot, Alain Bouilloux, Benoit Ernst
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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
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Patent number: 5986036Abstract: A new holographic substrate utilizing flexible, optically transparent fluorinated polyimides. Said substrates have extremely low birefringence which results in a high signal to noise ratio in subsequent holograms. Specific examples of said fluorinated polyimides include 6FDA+APB and 6FDA+4BDAF.Type: GrantFiled: June 27, 1997Date of Patent: November 16, 1999Assignee: The United States of America as represented by the Administrator of the National Aeronautics and Space AdministrationInventors: Paul A. Gierow, William R. Clayton, Anne K. St. Clair
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Patent number: 5969088Abstract: An angularity enhancement layer in a liquid crystal display, which display comprises a liquid crystal cell, wherein the angularity enhancement layer includes a negative birefringent polyimide layer comprising a plurality of structural units having pendant fluorene groups, said angularity enhancement layer being disposed on at least one surface of said liquid crystal cell. A liquid crystal display can comprise an angularity enhancement construction of the invention which comprises a polyimide layer.Type: GrantFiled: May 5, 1998Date of Patent: October 19, 1999Assignee: 3M Innovative Properties CompanyInventors: Stephen A. Ezzell, Hassan Sahouani, Ernest L. Thurber
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Patent number: 5969079Abstract: Thermomechanical and thermo-oxidative stabilities in resin composites across the range of aerospace "engineering thermoplastic" resins are improved by forming four crosslinks at each addition polymerization site in the backbone of the resin using crosslinking functionalities of the general formula: ##STR1## wherein Z= ##STR2## .beta.=the residue an organic radical selected from the group consisting of: ##STR3## R.sub.R =a divalent organic radical; X=halogen;Me=methylT=allyl or methallyl.G=--CH.sub.2 --,--S--, --CO--, --SO--, --O--, --CHR.sub.3 --, or --C(R.sub.3).sub.2 --;i=1 or 2;R.sub.3 =hydrogen, lower alkyl, lower alkoxy, aryl, or aryloxy; and.theta.=--C.tbd.N, --O--C.tbd.N, --S--C.tbd.N, or --CR.sub.3 .dbd.C(R.sub.3).sub.Type: GrantFiled: October 21, 1994Date of Patent: October 19, 1999Assignee: The Boeing CompanyInventors: Hyman R. Lubowitz, Clyde H. Sheppard
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Patent number: 5968640Abstract: The morphology of multidimensional, thermally stable oligomers is combined with the inclusion of charge carrier linkages within the polymer arms to produce thermally stable advanced composites from cured oligomers that are conductive or semiconductive if suitably doped.Type: GrantFiled: September 5, 1985Date of Patent: October 19, 1999Assignee: The Boeing CompanyInventors: Hyman R. Lubowitz, Clyde H. Sheppard, Larry P. Torre
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Patent number: 5969081Abstract: Disclosed herein are cyclic oligomers comprising substituted or unsubstituted m-phenylene isophthalamide, complexes of these oligomers with selected metal salts, novel methods for their preparation, and polymerization of the cyclic oligomers to linear aramids. The aramids are useful, for example, as fibers for fire resistant clothing. Amino-functional cyclic oligomers may be reacted with polyfunctional acyl halides to produce polyamides.Type: GrantFiled: March 6, 1998Date of Patent: October 19, 1999Assignee: E. I. du Pont de Nemours and CompanyInventors: Young Hwan Kim, Wesley Memeger, Jr.
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Patent number: 5969080Abstract: A film excellent in flatness, and not degraded in flatness by curling, etc. even at high temperature during processing and use as a product.The film of the present invention is made of an aromatic polyamide and/or aromatic polyimide, and satisfies the following:(Pmax-Pmin)/Pavr.ltoreq.1.0where Pmax is the maximum value of the orientation degree obtained from the Raman spectrum in the section direction of the film; Pmin is the minimum value and Pavr is the average value.Type: GrantFiled: December 30, 1997Date of Patent: October 19, 1999Assignee: Toray Industries, Inc.Inventors: Toshiya Ieki, Akimitsu Tsukuda, Toshihiro Tsuzuki
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Patent number: 5958292Abstract: A polyamic acid derived from an amine component comprising a 2-cyano-1,4-phenylene diamine and a family of diaryl ketones is claimed. The polyamic acids are useful in formation of polyimides, also claimed, and for the optical alignment of liquid crystals and the manufacture of liquid crystal optical elements, also claimed.Type: GrantFiled: May 18, 1998Date of Patent: September 28, 1999Assignee: Elsicon Inc.Inventors: Wayne M. Gibbons, Paul Joseph Shannon, Hanxing Zheng
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Patent number: 5959042Abstract: A material is provided comprising: (a) a polyamide; (b) a polymer having PA blocks and polyether PEG blocks; (c) optionally a polyolefin; (d) a functionalized polyolefin; the various constituents being present in amounts by weight, a, b, c and d such that: a>0; b>0; c+d>0; a+b+c+d=100; with a/b>0.2; (a+b)/(c+d)>1; and b/(a+b+c+d)<0.5. A film which is non-porous but breathable, i.e. porous to water vapor but not to water, and an antistatic object obtained from this material are also provided.Type: GrantFiled: November 14, 1997Date of Patent: September 28, 1999Assignee: Elf Atochem S.A.Inventors: Alain Bouilloux, Patrick Alex
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Patent number: 5955568Abstract: The disclosure describes a process for preparing a polyamideimide resin having high molecular weight in a simple manner wherein major problems of the prior processes such as low heat resistance and low melt flowability are improved. The process comprises condensation of an aromatic tricarboxylic acid anhydride and an aromatic diamine in a polar solvent, subjecting the resulting diimidedicarboxylic acid to acyl halogenating agent treatment to give an intermediate having good reactivity at low temperature, and then subjecting the latter to direct polymerization by using diamine as a nucleophilic agent to give a polyamideimide resin having high molecular weight. The polyamideimide resin prepared by the present invention can be used as major heat resistant structural material in advanced industries and as paint, sheet, adhesives, sliding material, fiber and film having heat resistance.Type: GrantFiled: October 23, 1997Date of Patent: September 21, 1999Assignee: Korea Research Institute of Chemical TechnologyInventors: Kil-Yeong Choi, Dong-Hack Suh, Mi-Hie Yi, Young-Taik Hong, Moon-Young Jin
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Patent number: 5955566Abstract: Thermosetting polymers with high temperature capability for composite and adhesive applications are disclosed. Inhibitors for improving pot life, gel time and storage stability are disclosed. These polymers are ideally suited for adhesives and RTM, resin film infusion, and prepreg methods to make polymer matrix, fiber reinforced composite parts.Type: GrantFiled: November 13, 1996Date of Patent: September 21, 1999Assignee: Cytec Technology CorporationInventors: Jean Lee, Jack Douglas Boyd, Albert Kuo
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Patent number: 5952448Abstract: This invention relates to a poly (imide amic ester) random copolymer, a precursor thereof, and a process for preparing the same. Specifically this invention relates to a novel precursor of polyimide, poly(imide amic ester) which is chemically stable and has excellent workability in either liquid or solid state, a polyimide obtained therefrom and a process for preparing the same.Type: GrantFiled: December 30, 1997Date of Patent: September 14, 1999Assignee: Korea Research Institute of Chemical TechnologyInventors: Myung-Hun Lee, Seo-Bong Lee, Chang-Jin Lee, Eun-Kyoung Kim, Mi-Seon Ryoo
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Patent number: 5952453Abstract: Methylenedianiline-free, PMR-type, curable compositions based on m-phenylenediamine or mixtures of m-phenylenediamine and p-phenylenediamine are described.Type: GrantFiled: May 8, 1996Date of Patent: September 14, 1999Assignee: Cytec Technology Corp.Inventors: Patrick T. McGrail, Paul Eustace, William S. Dewar
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Patent number: 5945503Abstract: A polymaleimide resin composition is herein disclosed which comprises an aromatic amino resin, a polymaleimide resin and a bifunctional crosslinking agent as components, and the bifunctional crosslinking agent is selected from the group consisting of an aliphatic diamine compound, a 2,4-diamino-S-triazine compound, a diisocyanate compound, an aliphatic diamine compound and a bismaleimide compound; and a laminate plate for a semiconductor substrate in which the polymaleimide resin composition is used is also disclosed. The thermosetting resin composition permits the preparation of prepregs and green sheets having excellent flexibility, so that the workability and the productivity of the laminate plates can remarkably be improved.Type: GrantFiled: November 10, 1997Date of Patent: August 31, 1999Assignee: Mitsui Chemicals, Inc.Inventors: Keisuke Takuma, Takuo Tajima, Yoshiyuki Shindo, Koutaro Suzuki, Tatsuhiro Urakami, Atsuo Otsuji, Kouzou Tanaka
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Patent number: 5939520Abstract: Regiospecific polyamide-imides are cast to form membranes which exhibit superior gas separation properties when compared to polyamide-imide membranes formed from random copolymers. The regiospecific polyamide-imides are synthesized by reacting specific aromatic diimide dicarboxylic acids with select aromatic diamines.Type: GrantFiled: September 5, 1997Date of Patent: August 17, 1999Assignee: Air Products and Chemicals, Inc.Inventor: Michael Langsam
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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
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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
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Patent number: 5939521Abstract: This invention relates the novel diamines, the polyimide oligomers and the polyimides derived therefrom and to the method of preparing the diamines, oligomers and the polyimides. The thermoplastic polyimides derived from the aromatic diamines of this invention are characterized as having a high glass transition temperature, good mechanical properties and improved processability in the manufacture of adhesives, electronic and composite materials for use in the automotive and aerospace industry. The distinction of the novel aromatic diamines of this invention is the 2,2',6,6'-substituted biphenyl radicals which exhibit noncoplanar conformation that enhances the solubility of the diamine as well as the processability of the polyimides, while retaining a realatively high glass transition temperature and improved mechanical properties at useful temperature ranges.Type: GrantFiled: January 23, 1998Date of Patent: August 17, 1999Assignee: The United States of America as represented by the Administrator of the National Aeronautics and Space AdministrationInventor: Chun-Hua K. Chuang
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Patent number: 5929201Abstract: The present invention relates to amine compositions and the preparation of polyimides. The polyimides can be used for inducing alignment of a liquid crystal medium with polarized light and liquid crystal display elements.Type: GrantFiled: May 20, 1997Date of Patent: July 27, 1999Assignee: Elsicon, Inc.Inventors: Wayne M. Gibbons, Paul J. Shannon, Shao-Tang Sun
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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
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Patent number: 5919893Abstract: Degradable polyesteramide suitable for use in biomedical applications is obtained by reacting diamino alkyl ester with alpha hydroxy acid to form diamide-diol which is reacted with acyl halide or dicarboxylic acid to yield polyesteramide.Type: GrantFiled: January 28, 1998Date of Patent: July 6, 1999Assignee: United States Surgical CorporationInventors: Mark S. Roby, Ying Jiang
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Patent number: 5916996Abstract: A process for the preparation of polyester-imide resin of the formula ##STR1## wherein n represents the number of segments present and is a number of from about 10 to about 10,000; R' is alkyl or alkylene; and R is independently an oxyalkylene or a polyoxyalkylene by the reaction of trimellitic acid, or a trimellitic anhydride, a glycol and a diamine of the formula ##STR2## wherein R represents a hydrogen or alkyl group; and n represents the number of monomer segments, and is a number of from about 1 to about 10, and which reaction is accomplished by heating the aforementioned components.Type: GrantFiled: June 23, 1994Date of Patent: June 29, 1999Assignee: Xerox CorporationInventors: Guerino G. Sacripante, Melvin D. Croucher, Stephan V. Drappel
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Patent number: 5914387Abstract: Polyesteramides having amino acid-derived groups alternating with hydroxy acid-derived groups are useful in making shaped articles, particularly, shaped articles suitable for use as surgical devices.Type: GrantFiled: January 28, 1998Date of Patent: June 22, 1999Assignee: United States Surgical CorporationInventors: Mark S. Roby, Ying Jiang
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Patent number: 5914354Abstract: A photosensitive resin composition comprising;(A) a polyimide precursor containing an acrylic or methacrylic group;(B) a tertiary amine compound represented by the general formula: ##STR1## wherein R.sup.6 is a monovalent organic group having 3 or less carbon atoms, R.sup.7 is a divalent organic group having 3 or less carbon atoms, and R.sup.8 is a hydrogen atom or a methyl group; and(C) at least one of a photopolymerization initiator and a sensitizer.This composition has a sufficient sensitivity even when thick films are formed, has a superior developability in an aqueous alkali solution, and is suited for the formation of polyimide patterns.Type: GrantFiled: August 12, 1997Date of Patent: June 22, 1999Assignee: Shin-Etsu Chemical Co., Ltd.Inventor: Hideto Kato
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Patent number: 5914385Abstract: An addition type polyimide resin raw material composition having high heat resistance and high corrosion resistance comprising a tetracarboxylic anhydride and/or tetracarboxylic diester compound, diamine compound and exo-3,6-epoxy-1,2,3,6-tetrahydrophthalic anhydride and/or exo-3,6-epoxy-1,2,3,6-tetrahydrophthalic monoester compound; a composition containing a prepreg; a fiber-reinforced polyimide composite prepreg, coating material and paint using them; and a curing method thereof.Type: GrantFiled: December 4, 1996Date of Patent: June 22, 1999Assignee: Mitsubishi Jukogyo Kabushiki KaishaInventors: Noriya Hayashi, Naomoto Ishikawa, Yukihiro Sakaguchi, Shunichi Hayashi, Hitoshi Noda
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Patent number: 5908915Abstract: Copolyetherimides are prepared by the reaction of an alkali metal salt of a dihydroxyaromatic compound with a bis(substituted phthalimide) and a third compound which may be a substituted aromatic ketone or sulfone or a macrocyclic polycarbonate or polyarylate oligomer. The reaction takes place the in presence of a solvent and a phase transfer catalyst having high thermal stability, such as a hexaalkylguanidinium halide. Random or block copolymers may be obtained, depending on the reaction conditions.Type: GrantFiled: October 6, 1997Date of Patent: June 1, 1999Assignee: General Electric CompanyInventor: Daniel Joseph Brunelle
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Patent number: 5902874Abstract: Cyclic monomers prepared by novel methods are useful in making polyesteramides which can be made into shaped articles, particularly, shaped articles suitable for use as surgical devices.Type: GrantFiled: January 28, 1998Date of Patent: May 11, 1999Assignee: United States Surgical CorporationInventors: Mark S. Roby, Ying Jiang
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Patent number: 5902875Abstract: A polyesteramide suitable for use in the fabrication of absorbable surgical devices such as monofilament and multifilament sutures, films, sheets, plates, clips, staples, pins, screws, and the like, is obtained by reacting a monoalkanolamine such as ethanolamine with a diacid halide such as succinic acidchloride to provide a diamidediol and thereafter reacting the diamidediol with the same or different diacid halide under polymerization conditions to form the polyesteramide.Type: GrantFiled: January 28, 1998Date of Patent: May 11, 1999Assignee: United States Surgical CorporationInventors: Mark S. Roby, Ying Jiang