# US 10,872,712 B2 · Insulated wire

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- Number: US 10,872,712 B2
- Document ID: US10872712B2
- Status: Granted
- Kind: B2
- Application number: 16/175,019
- Filed: 2018-10-30
- Published: 2019-05-09
- Granted: 2020-12-22
- Earliest claimed: 2017-11-07
- Assignees: Hitachi Metals, Ltd.
- Applicants: Hitachi Metals, Ltd.
- Inventors: Masafumi Kaga; Tamotsu Kibe
- Web page: https://patentgrep.com/patent/US10872712B2

## CPC

- H01B 7/295: using material resistant to flame
- H01B 3/441: {from alkenes}
- H01B 3/447: {from acrylic compounds}
- H01B 7/0291: {comprising two or more layers of insulation having different electrical properties}
- H01B 3/307: {Other macromolecular compounds}
- H01B 3/448: {from other vinyl compounds}
- 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})

## Abstract

An insulated wire having an electrical wire structure capable of reducing a diameter while a direct-current stability property and a flame-retardant property are highly kept is provided. In the insulated wire including: a conductor; a flame-retardant semiconductive layer arranged on an outer periphery of the conductor; an insulating layer arranged on an outer periphery of the flame-retardant semiconductive layer; and a flame-retardant layer arranged on an outer periphery of the insulating layer, an oxygen index of the flame-retardant semiconductive layer defined by JIS K7201-2 is larger than 40, and a volume resistivity of the flame-retardant semiconductive layer defined by JIS C2151 is equal to or smaller than 5.0×1015 (Ωcm).

## Claims

### Claim 1

An insulated wire comprising:
a conductor;
a flame-retardant semiconductive layer arranged immediately on the conductor;
an insulating layer arranged on an outer periphery of the flame-retardant semiconductive layer; and
a flame-retardant layer arranged on an outer periphery of the insulating layer,
wherein an oxygen index of the flame-retardant semiconductive layer defined by JIS K7201-2 is larger than 40,
a volume resistivity of the flame-retardant semiconductive layer defined by JIS C2151 is equal to or smaller than 5.0×1015 (Ωcm),
the flame-retardant semiconductive layer contains a resin component and a non-halogen filler so as to contain 150 or more and 250 or less parts by mass of the non-halogen filler per 100 parts by mass of the resin component, and
the insulating layer contains an additive in an amount that is less than or equal to 5 parts by mass per 100 parts by mass of the resin component.

### Claim 2 (depends on 1)

The insulated wire according to claim 1,
wherein a diameter of the conductor is equal to or smaller than 1.25 mm, and
a total of the thicknesses of the flame-retardant semiconductive layer, the insulating layer, and the flame-retardant layer is smaller than 0.6 mm.

### Claim 3 (depends on 1)

The insulated wire according to claim 1,
wherein a diameter of the conductor is larger than 1.25 mm and equal to or smaller than 5.0 mm, and
a total of the thicknesses of the flame-retardant semiconductive layer, the insulating layer, and the flame-retardant layer is smaller than 0.7 mm.

### Claim 4 (depends on 1)

The insulated wire according to claim 1,
wherein the insulated wire has a flame-retardant property that allows the insulated wire to pass a vertical tray flame test (VTFT) on the basis of EN 50266-2-4.

### Claim 5 (depends on 1)

The insulated wire according to claim 1,
wherein the insulated wire has a direct-current stability that allows the insulated wire to pass a direct-current stability test in conformity to EN 50305.6.7.

### Claim 6 (depends on 1)

The insulated wire according to claim 1,
wherein a volume resistivity of the insulating layer defined by JIS C2151 is larger than 1.0×1016 (⋅cm).

### Claim 7 (depends on 1)

The insulated wire according to claim 1,
wherein an oxygen index of the flame-retardant layer is larger than 40.

### Claim 8 (depends on 1)

The insulated wire according to claim 1,
wherein the flame-retardant semiconductive layer includes at least one resin selected from a group consisting of high-density polyethylene, linear low-density polyethylene, low-density polyethylene, ethylene-(a-olefin) copolymer, ethylene-vinyl acetate copolymer, ethylene-acrylic acid ester copolymer, and ethylene-propylene-diene copolymer.

### Claim 9 (depends on 1)

The insulated wire according to claim 1,
wherein the flame-retardant layer includes at least one resin selected from a group consisting of high-density polyethylene, linear low-density polyethylene, low-density polyethylene, ethylene-(a-olefin) copolymer, ethylene-vinyl acetate copolymer, ethylene-acrylic acid ester copolymer, and ethylene-propylene-diene copolymer.

### Claim 10 (depends on 1)

The insulated wire according to claim 1,
wherein at least a part of the insulating layer is a cross-linked substance.

### Claim 11 (depends on 1)

The insulated wire according to claim 1,
wherein a resin composition making up the insulating layer contains a resin component, and
the resin component is made of high-density polyethylene and/or low-density polyethylene.

### Claim 12 (depends on 1)

The insulated wire according to claim 1, wherein the non-halogen filler is made of metallic hydroxide.

### Claim 13 (depends on 1)

The insulated wire according to claim 1, wherein the insulating layer is a cross-linked substance whose gel fraction is equal to or larger than 40% and equal to or smaller than 100%.