# US 4,400,430 A · Magnet wires

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- Number: US 4,400,430 A
- Document ID: US4400430A
- Status: Granted
- Kind: A
- Application number: 06/401,770
- Filed: 1982-07-26
- Granted: 1983-08-23
- Earliest claimed: 1981-07-24
- Assignees: Sumitomo Electric Industries, Ltd.
- Inventors: Masayoshi Miyake; Isao Ueoka; Munetaka Kawaguchi
- Web page: https://patentgrep.com/patent/US4400430A

## CPC

- H01B 3/308: {Wires with resins}
- C08G 69/48: Polymers modified by chemical after-treatment
- H01B 3/305: {Polyamides or polyesteramides}
- Y10T 428/294: including metal or compound thereof [excluding glass, ceramic and asbestos]
- Y10T 428/2947: Synthetic resin or polymer in plural coatings, each of different type
- H01B: CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES (selection for magnetic properties H01F1/00; waveguides H01P {; printed circuits H05K})
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A magnet wire comprising a layer of baked enamel formed on the conductor either directly or through another insulation is disclosed. At least the outermost layer of the wire has an insulation coating formed by applying and baking an enamel composition consisting essentially of a polyamide at least one molecule of which is terminated with a straight alkyl group having 21 or more carbon atoms.

## Claims

### Claim 1

A magnet wire, comprising:
an electrical conductor core; and
at least one outermost insulation layer surrounding the core, the layer being formed by applying and baking an enamel composition consisting essentially of a polyamide polymer at least one molecule of which is terminated with a straight chain alkyl group having 21 or more carbon atoms, the straight chain alkyl group being contained in the polyamide in an amount of 0.3 to 3.5% by weight.

### Claim 2 (depends on 1)

A magnet wire as claimed in claim 1, wherein the electrical conductor is in direct contact with an inner insulation layer, the inner insulation layer being in direct contact with and being surrounded by the outermost insulation layer.

### Claim 3 (depends on 1, 2)

A magnet wire as claimed in claim 1 or 2, wherein the straight chain alkyl group is contained in the polyamide in an amount of 0.3 to 2.5% by weight.

### Claim 4 (depends on 1, 2)

A magnet wire as claimed in claim 1 or 2, wherein the polyamide is nylon-6,6.

### Claim 5 (depends on 1, 2)

A magnet wire as claimed in claim 1 or 2, wherein the polyamide is nylon-6.

### Claim 6 (depends on 1, 2)

A magnet wire as claimed in claim 1 or 2, wherein the polyamide is a copolymerized nylon including a nylon-12 unit.

### Claim 7 (depends on 1, 2)

A magnet wire as claimed in claim 1 or 2, wherein the polyamide is terminated with a straight alkyl group having 27 or more carbon atoms, said enamel being a polymer solution produced by reacting a polyamide with a carboxylic acid having a straight alkyl group of 27 or more carbon atoms in a phenolic solvent under heating.