BE655562A - - Google Patents

Info

Publication number
BE655562A
BE655562A BE655562DA BE655562A BE 655562 A BE655562 A BE 655562A BE 655562D A BE655562D A BE 655562DA BE 655562 A BE655562 A BE 655562A
Authority
BE
Belgium
Application number
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed filed Critical
Publication of BE655562A publication Critical patent/BE655562A/xx

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
    • H01B3/303—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups H01B3/38 or H01B3/302
    • H01B3/306—Polyimides or polyesterimides
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
    • C08G73/06—Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromolecule
    • C08G73/10—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
    • C08G73/06—Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromolecule
    • C08G73/10—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
    • C08G73/1003—Preparatory processes
    • C08G73/1007—Preparatory processes from tetracarboxylic acids or derivatives and diamines
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
    • C08G73/06—Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromolecule
    • C08G73/10—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
    • C08G73/1046—Polyimides containing oxygen in the form of ether bonds in the main chain
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
    • C08G73/06—Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromolecule
    • C08G73/10—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
    • C08G73/1057—Polyimides containing other atoms than carbon, hydrogen, nitrogen or oxygen in the main chain
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
    • C08G73/06—Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromolecule
    • C08G73/10—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
    • C08G73/1057—Polyimides containing other atoms than carbon, hydrogen, nitrogen or oxygen in the main chain
    • C08G73/106—Polyimides containing other atoms than carbon, hydrogen, nitrogen or oxygen in the main chain containing silicon
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
    • C08G73/06—Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromolecule
    • C08G73/10—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
    • C08G73/1057—Polyimides containing other atoms than carbon, hydrogen, nitrogen or oxygen in the main chain
    • C08G73/1064—Polyimides containing other atoms than carbon, hydrogen, nitrogen or oxygen in the main chain containing sulfur
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
    • C08G73/06—Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromolecule
    • C08G73/10—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
    • C08G73/1067—Wholly aromatic polyimides, i.e. having both tetracarboxylic and diamino moieties aromatically bound
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
    • C08G73/06—Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromolecule
    • C08G73/10—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
    • C08G73/1067—Wholly aromatic polyimides, i.e. having both tetracarboxylic and diamino moieties aromatically bound
    • C08G73/1071—Wholly aromatic polyimides containing oxygen in the form of ether bonds in the main chain
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2913—Rod, strand, filament or fiber
    • Y10T428/2933—Coated or with bond, impregnation or core
    • Y10T428/294—Coated or with bond, impregnation or core including metal or compound thereof [excluding glass, ceramic and asbestos]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/3154—Of fluorinated addition polymer from unsaturated monomers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/3154—Of fluorinated addition polymer from unsaturated monomers
    • Y10T428/31544—Addition polymer is perhalogenated
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31678—Of metal
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31678—Of metal
    • Y10T428/31681—Next to polyester, polyamide or polyimide [e.g., alkyd, glue, or nylon, etc.]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31721—Of polyimide
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31786—Of polyester [e.g., alkyd, etc.]

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Laminated Bodies (AREA)
  • Reinforced Plastic Materials (AREA)
  • Macromolecular Compounds Obtained By Forming Nitrogen-Containing Linkages In General (AREA)
BE655562D 1962-01-26 1964-11-10 BE655562A (xx)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US169120A US3179634A (en) 1962-01-26 1962-01-26 Aromatic polyimides and the process for preparing them

Publications (1)

Publication Number Publication Date
BE655562A true BE655562A (xx) 1965-03-01

Family

ID=22614333

Family Applications (1)

Application Number Title Priority Date Filing Date
BE655562D BE655562A (xx) 1962-01-26 1964-11-10

Country Status (3)

Country Link
US (1) US3179634A (xx)
BE (1) BE655562A (xx)
GB (1) GB982914A (xx)

Families Citing this family (185)

* Cited by examiner, † Cited by third party
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NL298949A (xx) * 1962-10-08
NL299131A (xx) * 1962-10-11
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US3282897A (en) * 1963-09-25 1966-11-01 Du Pont Process for preparing a polyamide-ester
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US3282898A (en) * 1963-11-21 1966-11-01 Du Pont Treatment of aromatic polyamide-acids with carbodiimides
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US3411122A (en) * 1966-01-13 1968-11-12 Ibm Electrical resistance element and method of fabricating
US3442861A (en) * 1966-05-02 1969-05-06 Du Pont Polyamide-acid and polyimide polymers cross-linked with selected aldehydes and ketones
US3413267A (en) * 1966-05-17 1968-11-26 Du Pont Copolyimide-isoimide polymers
US3338859A (en) * 1966-06-30 1967-08-29 Dow Corning Silicone polyimides
US3347808A (en) * 1966-07-05 1967-10-17 Monsanto Co Coating compositions
US3408867A (en) * 1966-10-10 1968-11-05 Anaconda Wire & Cable Co Temperature measuring sea water probe, insulated wire suitable therefor and method of making same
US3356648A (en) * 1966-10-13 1967-12-05 Du Pont Polyamide-acids and polyimides from hexafluoropropylidine bridged diamine
US3484532A (en) * 1966-10-18 1969-12-16 Haveg Industries Inc Electrical conductor with light-weight electrical shield
US3484286A (en) * 1966-12-05 1969-12-16 Reeves Ind Inc High temperature magnetic tape
US3416994A (en) * 1967-01-12 1968-12-17 Du Pont Cross-linked polyimide
US3634130A (en) * 1967-02-03 1972-01-11 Monsanto Chemicals Impregnates reinforcing materials
US3394023A (en) * 1967-02-09 1968-07-23 Thin Film Inc Process for converting water-repellent surfaces of plastic into water-attractive surfaces
US3528774A (en) * 1967-03-14 1970-09-15 Us Air Force Formation of high modulus,high strength graphite yarns
US3410826A (en) * 1967-04-10 1968-11-12 Du Pont Process for preparing shaped articles from polyamide acids before converting to insoluble polyimides
US3531437A (en) * 1967-04-24 1970-09-29 Rhone Poulenc Sa Dimethylformamide soluble phosphorus-containing polypyromellimides
US3448617A (en) * 1967-05-18 1969-06-10 Gen Electric Liquid level sensor adapted for use in hydrocarbon fuels
US3519510A (en) * 1967-05-26 1970-07-07 Edward J Ardolino Formation of structural honeycomb
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US3804669A (en) * 1967-07-11 1974-04-16 Corning Glass Works Flame-resistant resistor coatings
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FR96145E (fr) * 1967-11-30 1972-05-19 Trw Inc Polyimides stables et a durcissement rapide a partir de prépolymeres, et procédé pour leur préparation.
US3523056A (en) * 1967-12-13 1970-08-04 Gen Electric Stretchable silicone bonded,compacted glass fabric-polyimide laminate tape and method for making the same
US3502625A (en) * 1968-01-10 1970-03-24 Eastman Kodak Co Polyimides and poly(amide - acids)prepared from diamines and thianthrenetetracarboxylic acid 5,5,10,10-tetraoxides
US3534003A (en) * 1968-05-08 1970-10-13 Gen Electric Polyamide imides prepared from aromatic cyclic sulfone amines and haloformylphthalic anhydrides
US3539537A (en) * 1968-05-08 1970-11-10 Gen Electric Polyamide-acids and polyimides prepared by reacting organic dianhydrides with aromatic diamino cyclic sulfones
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US3501443A (en) * 1968-05-20 1970-03-17 American Cyanamid Co Process for preparing a polyimide comprising reacting 3,4 - dicarboxy - 1,2,3,4-tetrahydro - 1 - naphthalene succinic dianhydride with a diprimary diamine in the presence of certain organic solvents
US3525965A (en) * 1968-08-16 1970-08-25 Teledyne Inc Electrical coil
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US3536666A (en) * 1968-11-29 1970-10-27 Minnesota Mining & Mfg Polyamide-acid and polyimides prepared from aromatic diamines containing at least two tetraarylmethane nuclei
US3663510A (en) * 1969-05-08 1972-05-16 Gen Electric Process for producing polyamide coating materials
US3624050A (en) * 1970-01-28 1971-11-30 Jorg Strickrodt Process for producing polyimides via polyamide acids without use of solvents
US3708459A (en) * 1970-06-24 1973-01-02 Trw Inc Molding power prepolymers
US3649892A (en) * 1970-07-13 1972-03-14 Mallory & Co Inc P R Capacitors utilizing bonded discrete polymeric film dielectrics
US3868348A (en) * 1970-12-30 1975-02-25 Alfred Anisimovich Berlin Thermostable heterocyclic polymers of aromatized bis adducts of diels-alder reaction between maleic anhydride and bisfuranic compounds
US3959350A (en) * 1971-05-17 1976-05-25 E. I. Du Pont De Nemours And Company Melt-fusible linear polyimide of 2,2-bis(3,4-dicarboxyphenyl)-hexafluoropropane dianhydride
US3853691A (en) * 1971-05-27 1974-12-10 Olin Corp Copper-plastic laminate
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US3835207A (en) * 1972-05-03 1974-09-10 Westinghouse Electric Corp Method for forming reverse osmosis membranes composed of polyamic acid salts
IT963296B (it) * 1972-07-24 1974-01-10 Montedison Spa Copoliimmidi elastomeriche conte nenti fluoro e procedimento per la loro preparazione
US3787718A (en) * 1972-08-08 1974-01-22 Sondell Res Deve Co Spherical electronic components
US3775722A (en) * 1972-09-01 1973-11-27 Westinghouse Electric Corp Magnetic core structures for instrument transformers
US3989670A (en) * 1972-12-29 1976-11-02 General Electric Company Method for making polyetherimides
US3900662A (en) * 1973-01-17 1975-08-19 Du Pont Bondable adhesive coated polyimide film and laminates
DE2326314C2 (de) * 1973-05-23 1983-10-27 Siemens AG, 1000 Berlin und 8000 München Verfahren zur Herstellung von Reliefstrukturen
US5290908A (en) * 1973-05-25 1994-03-01 The University Of Notre Dame Du Lac Acetylenic end-capped polyimides
US3998786A (en) * 1973-05-25 1976-12-21 University Of Notre Dame Du Lac Process for preparing aromatic polyimides, polyimides prepared thereby
US3928673A (en) * 1973-08-16 1975-12-23 Ball Brothers Res Corp Release and lubricating composition for glass molds and method and apparatus utilizing such composition
USRE33079E (en) * 1973-11-06 1989-10-03 Hughes Aircraft Company Homopolymerization of acetylene substituted polyimide polymers
US3912366A (en) * 1973-12-06 1975-10-14 Ibm Liquid crystal display assembly having polyimide layers
US3956136A (en) * 1974-01-03 1976-05-11 Union Carbide Corporation Nitrogen linked cyclic polyether ion binding polymeric liquid purification materials
US3926913A (en) * 1974-02-15 1975-12-16 Trw Inc Low temperature curing polyimides
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US4254174A (en) * 1979-03-29 1981-03-03 Massachusetts Institute Of Technology Supported membrane composite structure and its method of manufacture
US4371860A (en) * 1979-06-18 1983-02-01 General Electric Company Solderable varistor
US4271288A (en) * 1979-07-02 1981-06-02 The Dow Chemical Company Novel polyamic acid polymers and polyimide derivatives thereof
US4487911A (en) * 1979-07-23 1984-12-11 The P. D. George Company Stable polyamic acids
US4277583A (en) * 1979-12-03 1981-07-07 Plastics Engineering Company Oxirane polyimide copolymers
DE3018873A1 (de) * 1980-05-16 1981-11-26 Dow Corning GmbH, 8000 München Luft- und/oder ofentrockenender gleitlack zur bildung von trockenschmierfilmen
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US4543295A (en) * 1980-09-22 1985-09-24 The United States Of America As Represented By The Director Of The National Aeronautics And Space Administration High temperature polyimide film laminates and process for preparation thereof
US4329399A (en) * 1980-10-06 1982-05-11 E. I. Du Pont De Nemours And Company Coated, heat-sealable aromatic polymer film
US4358581A (en) * 1980-12-05 1982-11-09 E. I. Du Pont De Nemours And Company Polyimide manufacture
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