US3105775A - Combination coatings - Google Patents

Combination coatings Download PDF

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Publication number
US3105775A
US3105775A US10001561A US3105775A US 3105775 A US3105775 A US 3105775A US 10001561 A US10001561 A US 10001561A US 3105775 A US3105775 A US 3105775A
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Prior art keywords
enamel
parts
polyvinyl
wire
polyimide
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Lavin Edward
Albert H Markhart
Charles F Hunt
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Shawinigan Resins Corp
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Shawinigan Resins Corp
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Priority to BE615937D priority Critical patent/BE615937A/xx
Application filed by Shawinigan Resins Corp filed Critical Shawinigan Resins Corp
Priority to US10001561 priority patent/US3105775A/en
Priority to GB4619261A priority patent/GB1011285A/en
Priority to DE19621490279 priority patent/DE1490279A1/de
Priority to CH398462A priority patent/CH453449A/de
Application granted granted Critical
Publication of US3105775A publication Critical patent/US3105775A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/02—Disposition of insulation
    • H01B7/0208—Cables with several layers of insulating material
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D129/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Coating compositions based on hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Coating compositions based on derivatives of such polymers
    • C09D129/14—Homopolymers or copolymers of acetals or ketals obtained by polymerisation of unsaturated acetals or ketals or by after-treatment of polymers of unsaturated alcohols
    • 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
    • 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
    • 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
    • H01B3/308—Wires with resins
    • 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]
    • Y10T428/2942—Plural coatings
    • 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

Definitions

  • This invention relates to enameled wires; more particularly, it relates to wires coated with multiple layers of cured polyvinyl acetal resin compositions and polyimide resin compositions.
  • a method commonly used to upgrade the thermal life of polyvinyl acetal coatings consists in impregnating the ready to use wire winding with special varnishes.
  • the varnishes do not achieve the improvement sought by this invention and, moreover, suifer from the inconvenience that they must be applied after motor and generator coils are wound.
  • FIGURE 1 illustrates a wire coated with two layers of polyimide enamel and four layers of polyvinyl formal enamel; the polyimide layers are next to the metal.
  • the thickness of the insulation coatings is scaled to show approximately the number of layers of each type of coating.
  • FIGURE'Z the order of superposition of enamels has been reversed so that the polyvinyl formal enamel is now next to the metal.
  • the conductor is covered with four layers of polyvinylformal sandwiched between two layers of polyimide.
  • the polyvinyl formal resin employed contains 10.5% acetate groups calculated as polyvinyl acetate, 6% 'hydroxyl groups calculated as polyvinyl alcohol, and 83.5% formal groups calculated by difference as polyvinyl formal.
  • the phenolic resin is a soluble, fusible, heathardenable reaction product of 100 parts cresol, 60 parts formalin, and 3.2 parts ethanolamine, dissolved in commercial cresylic acid.
  • the polyurethane is the phenol blocked reaction product of one mo-l trimethylol propane with three mols of a mixture containing about 2,4- and about 20% 2,6-tolylene diisocyanates.
  • the melamine-formaldehyde resin is a relatively low molecular weight, butylated, internally plas-ticized condensation product of 1 mol melamine with 3.5 mols formaldehyde and 0.5 mol para-toluene sulfonamide.
  • the last two components employed in the preparation of these enamels are commercial cresylic acid and naphtha. Little need ,be said about enamels A to D themselves; they will be easily recognized by workers the field.
  • One of the polyamides employed in the examples, enamel E is the condensation product of pyromellitic dianhydride with 4,4'-oxydianiline.
  • the oxyariiline was recrystallized from ethyl alcohol-dimethyl acetamide, and technical pyromellitic dianhydride (86.7%) was purified by heating at 250 C. for two hours at 80 mm. pressure.
  • the resulting pyromellitic dianhydride, 14.8 g. was slurried in 71 ml. dry dimethyl-acetamide in a 3-neck, round-bottom flask fitted with a thermometer and an air condenser, protected with a calcium chloride drying tube.
  • the scrape abrasion test This test consists essentially in scraping repeatedly the insulated wire sample with a steel needle loaded with a set weight which is varied according to the build of the Wire. The tester solution thus obtained was applied on wire. Suflice it 5 records the number of strokes and shuts off when contact to mention at this stage that the polyamide, after it has is made between the needle and the bared wire. Insulabeen applied to the wire, is converted in situ to a tion which withstands an average of 30 strokes in six polyamide structure during the subsequent processing of different places is considered standard provided that no the wire. one place wears down with less than 15 strokes.
  • the other polyamide enamel used in the examples (F) The hydrolysis resistance test.In this test, entwined is a commercial product marketed under the brand name wire pairs are heated at 150 C. in sealed glass tubes ML; it consists essentially of a polyamide chemically containing 0.5 ml. water. At definite intervals, a pair similar to that in enamel E, dissolved as a by is taken out and is tested under increasing electrical weight solution in a 1:1 mixture of N-methylpyrrolidone potential until the insulation breaks down. Results are and dimethylacetamide and having a viscosity of about 15 reported as the period, in hours, of exposure to the con: 4800 cps. at 25 C.
  • EXAMPLES 8- 13 The testing of the enameled wires was done by stand- 7 and procedures, Althgugh n m h i l, physical Wires were then prepared with insulation consisting and electrical properties of the control wires and of the of four coats of polyvinyl formal resin over two coats new insulated wires were tested, the descriptions of the 0f Polyimide enamel as illustrated y FIGURE The testing procedures will be limited to those measuring significant properties of these new coatings are sumthe properties in which significant changes were observed, marized in the following table.
  • Table III 1 kWh-lite (hours) Hydrol- Build Abrasion ysis Enamel (mils) (strokes) resistance 180 0 200 0. 225 0. 250 0. 300 0 (hours) A on 11---. 2+1 31 2.000 2,000 2, 000 620 112 144 0 on E.
  • wires of Table II will quickly indicate that, although the 1 kilovolt-life test.
  • the 1 kv.-life test was made in regular six coat (3 mil build) polyimide wire has a theraccordance with the provisions of the American Institute mal life superior to any of the above combination enof Electrical Engineers specifications No. 57, dated Octo- 70 amels, two coats of enamels E or F placed under four ber 1955.
  • the test is a measure of the period for which coats of polyvinyl formal enamel will form insulation a coating can be exposed at the particular temperature that is far superior than that provided by twocoats of indicated before it will fail as electrical insulation upon enamel F alone.
  • the preferred resins will be those containing on a weight basis from about 1 to about 35% ester groups calculated as polyvinyl ester, from about 3 than those of either the polyvinyl formal coating and 5 to about hydroxyl groups calculated as polyvinyl the one mil pol-yimide coatings alone. It should also alcohol, the balance being substantially aldehyde acetal.
  • Suitable reactive hydrogen compounds include phenols, such as phenol, cresol, xylenols, etc., secondary aromatic Fon'C 0. 5+ 2.5 28 2,000 1,800 1, 900 792 so amines, monoand polyfunctional alcohols, amines, lac- CI1F 23 11100 508 265 29 tams, enols, and mixtures thereof.
  • the preferred blocking agents are compounds in which an hydroxyl group It is also obvious from these results that a single enamel i h d to an aromatic i F Undercoat With five P y y fm1$ rfisin Coats is
  • the simplest class of useful polyisocyanates can be not as desirable as a single enamel F overcoat. re resented by the following formula:
  • Suitable polyisocyanates include compounds amples that the thermal life of polyvinyl acetal resin such as phenylene diisocyanates, diphenylene diisocyainsulations is sensibly lengthened when they are used nates, tolylene diisocyanates, naphthylene diisocyanates, in conjunction with thinner layers of a polyimide enamel, diphenylmethane diisocyanates, cyclohexane diisocythe excellent abrasion and hydrolysis resistance of the anates, ethylene diisocyanates, tetramethylene diisoformer enamels being retained in the process.
  • polyvinyl acetal resin such as phenylene diisocyanates, diphenylene diisocyainsulations is sensibly lengthened when they are used nates, tolylene diisocyanates, naphthylene diisocyanates, in conjunction with thinner layers of a polyimide enamel, diphenylmethane diisocyanates,
  • the preferred polyurethanes are produced from mono-
  • the polyvinyl acetals that may be used mers or trimers of aromatic diisocyanates which are fully in this invention are obtained by the acctalization of blocked in order to advantageously avoid premature curpolyvinyl esters, partially hydrolyzed polyvinyl esters, ing and yet obtain the rapid, uniform and complete curand fully hydrolyzed polyvinyl esters, according to lug required for good solvent resistance, heat stability and methods well known in the art, such as those found in the numerous other properties needed for satisfactory U.S. Reissue No. 20,430 to Morrison et al. Polyvinyl electrical insulation.
  • acetals normally contain a certain number of hydroxyl
  • This preferred class of polyurethanes is made of the groups and may contain a certain number of ester groups blocked reaction products of a polyhydric alcohol with an arylene diisocyanate.
  • the polyhydric alcohols are in general limited to compounds containing not more than 16 carbon atoms and when used in wire enamels should preferably contain not more than 10 carbon atoms. Examples of these polyhydric alcohols are ethylene glycol, propylene glycol, glycerol, trirnethylol propane, pentaerythritol, hexane-triols, etc.
  • the class of polyurethanes is illustrated by the general formula OIEIII HO where R is an aromatic hydrocarbon radical containing up to 13 carbon atoms, or an alkyl substitute thereof.
  • the isocyanate groups are blocked with a reactive hydrogen containing compound such as phenol.
  • the melamine resins which can be used in the present wire enamel compositions can be selected from the general class of resinous aldehyde condensation products of melamine which are soluble in the organic liquids employed as solvents for the resinous components of the enamel.
  • the useful melamine compounds include such derivatives of melamine as melam and melem.
  • the alde hyde condensation products are well known and may be formed by reacting from l-6 mols of the aldehyde with 1 mol of melamine.
  • the solubility of the aldehydemelamine condensation product is generally obtained by further reacting the condensation product with an alcohol or by co-condensing the melamine and aldehyde in the presence of an alcohol.
  • the usable aldehydes are aliphatic, aromatic cyclic and heterocyclic aldehydes including formaldehyde, acetaldehyde, propionaldehyde, butyraldehyde, isobutyraldehyde, valeraldehyde, octaldehyde, benzaldehyde, cinnamaldehyde, cyclohexanone, furfural, etc.
  • the alcohols which may be used include aliphatic, cycloaliphatie, aromatic, nitro and amino alcohols such as methanol, ethanol, propanol, isopropanol, butanol, isobutanol, pentanols, octanols, lauryl alcohol, cetyl alcohol, stearyl alcohol, cyclohexanol, benzyl alcohol, cinnamyl alcohol, allyl alcohol, 2-nitro-l-butanol, 2-nitro-2-methyll-propanol, 2-nitro-2-methyl-1,3-propane diol, 2-nitro-2- ethyl-1,3-propane diol, tris(hydroxymethyl)nitromethane, 2 amino 1 butanol, 2-arnino-2-methyl-l-propanol, 2- amino-2-methyl-1,3-propane diol, 2-amino-2-ethyl-l,3- propane diol, tris(
  • the preferred melamine resins are the further reaction products of the melamine aldehyde and alcohol reactants with an aryl sulfonamide. These products are also well known and may be obtained by co-condensation of all the reactants named, as taught in US. 2,508,875, which is hereby incorporated by reference.
  • the useful aryl sulfonamides include benzene sulfonamide and the ring substituted derivatives thereof such as toluene sulfor1 amides, chlorobenzene sulfonarnides, nitrobenzene sulfonamides, etc. i
  • the co-condensation products of melamine, toluene sulfonamide, formaldehyde and butanol may be varied between the limits of 1 mol of melamine to from 0.1 to 1.0 of toluenesulfom amide and from 1 to 6 or more mols of formaldehyde. An excess of the formaldehyde may be used.
  • the toluene sulfonamide may be any of the isomeric ortho, meta or para derivatives or it may be a mixture of two or more of the isomers.
  • polyamides useful in this invention are the con-- densation products of tetracarboxylic aromatic acids with diamines and may be illustrated by the recurring structural unit These polymers are soluble, and can be converted in situ, as mentioned earlier, by further heating into polyimide structures that are extremely resistant to solvents:
  • the R of the formulae stands for a bivalent radical of either benzene, naphthalene, biphenyl, diphenyl ether, ditolyletheryd-iphenyl sulfide, diphenyl sulfone, diphenyl methane, 2,2- diphenyl propane, benzophenone, or from a low molecular weight saturated aliphatic hydrocarbon containing not more than siX carbon atoms.
  • the preferred class of polyamides is limited to the condensation products of pyromellitic dianhydride with a diarnine characterized by a lack of aliphatic hydrogen atoms and by the possession of a flexible linkage such 'as the ether group of 4,4'-oxydianiline.
  • These polyamides should preferably be such that they show a viscosity ranging from about 1300 centipoises to 5000 centipoises for a 15% by weight solution in 1:1 dimethylacetamide and N-methylpyrrolidone at 25 C.
  • Some of the resinous coatings that may be used in this invention are the solid reaction products, cured at 250 to 450 C. of 100 parts by weight of a polyvinyl acetal resin, 2.5 to 100 parts of a phenol aldehyde resin, and
  • the preferred balance of the properties required for insulated wire is obtained by the application of polyvinyl acetal resins containing, for each 100 parts of polyvinyl acetal, 5 to parts of a phenol aldehyde resin, 5 to 80 parts of a polyurethane and 0.5 to 20 parts of a melamine resin, and of a polyamide resin made from pyromellitic dianhydride and 4,4-oxydiani-
  • the preferred number of coats of resins are four and two for the acetal resins and the polyamide resin respectively for heavy build magnet wire.
  • wires with satisfactory properties can be made with an insulation cover of any thickness between 0.1 to 4 mils, this up to a point being a function of the wire diameter and the viscosity of the enamels, applied in 2 to 14 layers.
  • no restriction is intended to the four and two arrangement.
  • Combinations of five coatsof polyvinyl acetal resin and one coat of polyamide, for instance, have shown quite acceptable properties.
  • the examples have shown that while an outside covering of polyamide gives the best thermal results, the use of the polyamide as an undercoat to the polyvinyl acetal resin also achieves a great improvement in the significant wire properties.
  • a metal conductor coated with multiple layers of a cured polyvinyl acetal resin composition and of a polyimide composition comprising the condensation product of an aromatic tetracarboxylic acid with a diamino compound selected from the group consisting of aromatic diamines containing from 6 to 16 carbon atoms and saturated aliphatic diamines containing up to 6 carbon atoms.
  • An insulated conductor comprising a metallic element coated with multiple layers of (A) a resinous composition comprising, in parts by weight,
  • blocked polyisocyanate is the phenolic adduct of the reaction product of about one mol trimethylol propane with about three mols tolylene diisocyanate.
  • a process for producing a wire coated with 0.1 to 4.0 mil thick covering consisting of about 2 to 14 layers of insoluble and infusible resins, separately dried and cured at 250 to 450 C., originally applied by passing the wire through two liquid compositions comprising essentially, in parts by weight,
  • (A) for one of the compositions (1) parts of polyvinyl formal containing about 10.5% acetate groups calculated as polyvinyl acetate, about 6% hydroxyl groups calculated as polyvinyl alcohol, and about 83.5% formal groups calculated by difference as polyvinyl formal,
  • a metal conductor coated with insulation of a thickness of about 3 mils consisting of (A) four layers of a resinous composition comprising,
  • a soluble, heat-hardenable phenol aldehyde resin obtained by condensing one mol of a phenol selected from the group consisting of phenol, cresol, Xylenol, and mixtures, thereof, with from 0.75 to 2.0 mols of formaldehyde under alkaline conditions,
  • a metal conductor coated with insulation of a thickness of about 3 mils consisting of (A) four layers of a resinous composition comprising, in parts by weight,

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  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
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US10001561 1961-04-03 1961-04-03 Combination coatings Expired - Lifetime US3105775A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
BE615937D BE615937A (enrdf_load_stackoverflow) 1961-04-03
US10001561 US3105775A (en) 1961-04-03 1961-04-03 Combination coatings
GB4619261A GB1011285A (en) 1961-04-03 1961-12-27 Method of insulating conductors
DE19621490279 DE1490279A1 (de) 1961-04-03 1962-03-26 Metallischer Leiter
CH398462A CH453449A (de) 1961-04-03 1962-04-02 Isolierter metallener Leiter

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US10001561 US3105775A (en) 1961-04-03 1961-04-03 Combination coatings

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BE (1) BE615937A (enrdf_load_stackoverflow)
CH (1) CH453449A (enrdf_load_stackoverflow)
DE (1) DE1490279A1 (enrdf_load_stackoverflow)
GB (1) GB1011285A (enrdf_load_stackoverflow)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3220882A (en) * 1961-05-22 1965-11-30 Monsanto Co Metal conductor having alternate layers of epoxy enamel and polyamid enamel coatings
US3306771A (en) * 1963-11-18 1967-02-28 Beck & Co Gmbh Dr Plural ester-imide resins on an electrical conductor
US3428486A (en) * 1965-01-04 1969-02-18 George Co P D Polyamide-imide electrical insulation
US3442703A (en) * 1965-12-06 1969-05-06 Du Pont Plural coated electrical conductor
US3486934A (en) * 1966-08-01 1969-12-30 Minnesota Mining & Mfg Process for the production of a metal-polyimide composite and the resulting article
JPS4838500A (enrdf_load_stackoverflow) * 1971-09-20 1973-06-06
US3953649A (en) * 1973-08-12 1976-04-27 Kanegafuchi Kagaku Kogyo Kabushiki Kaisha Self-bonding magnet wire and process of manufacturing same
FR2429819A1 (fr) * 1978-06-27 1980-01-25 Rhone Poulenc Ind Compositions de revetement a base de polyacetals de vinyle
US4324837A (en) * 1979-06-27 1982-04-13 Sumitomo Electric Industries, Ltd. Self-bonding magnet wire
EP0224191A3 (en) * 1985-11-25 1989-02-22 E.I. Du Pont De Nemours And Company Method for forming optically smooth polymeric layers
WO2004058905A1 (en) * 2002-12-27 2004-07-15 Rotomac Electricals Pvt Ltd Self-priming coil coating compositions and method
FR2885729A1 (fr) * 2005-05-12 2006-11-17 Nexans Sa Cable de manutention pour l'alimentation electrique et/ou la transmission de signal
US20100231345A1 (en) * 2009-03-13 2010-09-16 Hitachi Magnet Wire Corp. Insulating coating composition and an insulated wire, and a coil formed using the same
US20130161065A1 (en) * 2011-12-22 2013-06-27 Hitachi Cable, Ltd. Insulated wire and coil

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111574919B (zh) * 2020-06-11 2021-11-19 苏州东特绝缘科技有限公司 一种金色聚氨酯涂料及其制备方法、漆包线

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2333922A (en) * 1941-07-14 1943-11-09 Du Pont Insulated electrical conductor

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2333922A (en) * 1941-07-14 1943-11-09 Du Pont Insulated electrical conductor

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3220882A (en) * 1961-05-22 1965-11-30 Monsanto Co Metal conductor having alternate layers of epoxy enamel and polyamid enamel coatings
US3306771A (en) * 1963-11-18 1967-02-28 Beck & Co Gmbh Dr Plural ester-imide resins on an electrical conductor
US3428486A (en) * 1965-01-04 1969-02-18 George Co P D Polyamide-imide electrical insulation
US3442703A (en) * 1965-12-06 1969-05-06 Du Pont Plural coated electrical conductor
US3486934A (en) * 1966-08-01 1969-12-30 Minnesota Mining & Mfg Process for the production of a metal-polyimide composite and the resulting article
JPS4838500A (enrdf_load_stackoverflow) * 1971-09-20 1973-06-06
US3953649A (en) * 1973-08-12 1976-04-27 Kanegafuchi Kagaku Kogyo Kabushiki Kaisha Self-bonding magnet wire and process of manufacturing same
FR2429819A1 (fr) * 1978-06-27 1980-01-25 Rhone Poulenc Ind Compositions de revetement a base de polyacetals de vinyle
US4324837A (en) * 1979-06-27 1982-04-13 Sumitomo Electric Industries, Ltd. Self-bonding magnet wire
EP0224191A3 (en) * 1985-11-25 1989-02-22 E.I. Du Pont De Nemours And Company Method for forming optically smooth polymeric layers
WO2004058905A1 (en) * 2002-12-27 2004-07-15 Rotomac Electricals Pvt Ltd Self-priming coil coating compositions and method
US20040204538A1 (en) * 2002-12-27 2004-10-14 Dhrubo Bhattacharya Self-priming coil coating composition and method
US7205353B2 (en) 2002-12-27 2007-04-17 Rotomac Electricals Pvt. Ltd. Self-priming coil coating composition and method
FR2885729A1 (fr) * 2005-05-12 2006-11-17 Nexans Sa Cable de manutention pour l'alimentation electrique et/ou la transmission de signal
US20100231345A1 (en) * 2009-03-13 2010-09-16 Hitachi Magnet Wire Corp. Insulating coating composition and an insulated wire, and a coil formed using the same
US20120043109A1 (en) * 2009-03-13 2012-02-23 Hitachi Magnet Wire Corp. Insulating coating composition and an insulated wire, and a coil formed using the same
US8247071B2 (en) * 2009-03-13 2012-08-21 Hitachi Magnet Wire Corp. Insulating coating composition and an insulated wire, and a coil formed using the same
US8367934B2 (en) * 2009-03-13 2013-02-05 Hitachi Magnet Wire Corp. Insulating coating composition and an insulated wire, and a coil formed using the same
US20130161065A1 (en) * 2011-12-22 2013-06-27 Hitachi Cable, Ltd. Insulated wire and coil
US9343197B2 (en) * 2011-12-22 2016-05-17 Hitachi Metals, Ltd. Insulated wire and coil

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BE615937A (enrdf_load_stackoverflow) 1900-01-01
CH453449A (de) 1968-06-14
GB1011285A (en) 1965-11-24
DE1490279A1 (de) 1969-01-30

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