# US 11,028,257 B2 · Flame-retardant resin composition, and insulating wire, metal cable, optical fiber cable and molded article using the same

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- Number: US 11,028,257 B2
- Document ID: US11028257B2
- Status: Granted
- Kind: B2
- Application number: 16/462,478
- Filed: 2017-10-03
- Published: 2020-02-27
- Granted: 2021-06-08
- Earliest claimed: 2016-11-22
- Assignees: Fujikura Ltd.
- Applicants: Fujikura Ltd.
- Inventors: Yusuke Yamaki; Shoichiro Nakamura
- Web page: https://patentgrep.com/patent/US11028257B2

## CPC

- C08L 23/06: Polyethylene
- C08L 23/0815: {with aliphatic 1-olefins containing one carbon-to-carbon double bond}
- C08L 23/36: by reaction with nitrogen-containing compounds, e.g. by nitration
- C08L 83/04: Polysiloxanes
- H01B 3/00: Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B 3/44: vinyl resins; acrylic resins (silicones H01B3/46)
- H01B 7/02: Disposition of insulation
- H01B 7/295: using material resistant to flame
- C08K 5/0066: {Flame-proofing or flame-retarding additives}
- C08K 5/09: Carboxylic acids; Metal salts thereof; Anhydrides thereof
- C08K 5/17: Amines; Quaternary ammonium compounds
- C08K 5/3432: Six-membered rings
- C08K 5/3492: Triazines
- C08K 5/5419: containing at least one Si—C bond
- C08K 2003/265: {Calcium, strontium or barium carbonate}
- C08L 2201/02: Flame or fire retardant/resistant
- C08L 2203/10: used for bottles
- C08L 2203/206: use in coating or encapsulating of electronic parts
- C08L 2205/02: containing two or more polymers of the same C08L -group
- C08L 2205/025: containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
- C08L 2207/062: HDPE
- C08L 2207/064: VLDPE
- C08L 2207/066: LDPE (radical process)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- 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})
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)

## Abstract

A flame-retardant resin composition may include a base resin composed of polyethylene and an acid-modified polyolefin, a silicone compound, a fatty acid-containing compound, and a hindered amine-based compound that includes a hindered amine structure. The polyethylene may include a high-density polyethylene, a medium-density polyethylene and a low-density polyethylene, where the high-density polyethylene has a density of 945 kg/m3 or more, the medium-density polyethylene has a density of 914 kg/m3 or more and less than 945 kg/m3, and the low-density polyethylene has a density of 864 kg/m3 or more and less than 914 kg/m3. The base resin may contain the high-density polyethylene in an amount of 40 mass % or more and 60 mass % or less, the medium-density polyethylene in an amount of 1 mass % or more and 35 mass % or less, and the low-density polyethylene in an amount of 10 mass % or more and 30 mass % or less.

## Claims

### Claim 1

A flame-retardant resin composition, comprising:
a base resin composed of polyethylene and an acid-modified polyolefin;
a silicone compound;
a fatty acid-containing compound; and
a hindered amine-based compound including a hindered amine structure;
wherein the polyethylene includes a high-density polyethylene, a medium-density polyethylene and a low-density polyethylene,
wherein the high-density polyethylene has a density of 945 kg/m3 or more,
the medium-density polyethylene has a density of 914 kg/m3 or more and less than 945 kg/m3, and
the low-density polyethylene has a density of 864 kg/m3 or more and less than 914 kg/m3,
wherein the base resin contains the high-density polyethylene in an amount of 40 mass % or more and 60 mass % or less,
the base resin contains the medium-density polyethylene in an amount of 1 mass % or more and 35 mass % or less,
the base resin contains the low-density polyethylene in an amount of 10 mass % or more and 30 mass % or less, and
the base resin contains the acid-modified polyethylene in an amount of 1 mass % or more and 20 mass % or less,
wherein the silicone compound is blended in an amount of 3 parts by mass or more and 10 parts by mass or less relative to 100 parts by mass of the base resin,
the fatty acid-containing compound is blended in an amount of 3 parts by mass or more and 10 parts by mass or less relative to 100 parts by mass of the base resin,
the hindered amine-based compound is blended in an amount of 0.2 part by mass or more and 2.4 parts by mass or less relative to 100 parts by mass of the base resin, and
wherein the hindered amine-based compound is composed of a first hindered amine-based compound and a second hindered amine-based compound different from the first hindered amine-based compound.

### Claim 2 (depends on 1)

The flame-retardant resin composition according to claim 1, wherein in the first hindered amine-based compound, a nitrogen atom of the hindered amine structure is bonded to an oxygen atom, and
in the second hindered amine-based compound, a nitrogen atom of the hindered amine structure is bonded to a hydrogen atom or a carbon atom.

### Claim 3 (depends on 2)

The flame-retardant resin composition according to claim 2, wherein the first hindered amine-based compound includes a group represented by the following formula (1A):
where R1 to R4 each independently represent an alkyl group having 1 to 8 carbon atoms; R5 represents an alkyl group having 1 to 18 carbon atoms, a cycloalkyl group having 5 to 12 carbon atoms, an aralkyl group having 7 to 25 carbon atoms, or an aryl group having 6 to 12 carbon atoms.

### Claim 4 (depends on 3)

The flame-retardant resin composition according to claim 3, wherein the first hindered amine-based compound is represented by the following formula (2A):
where R6 to R8 each independently represent a group represented by the following formula (3A):
where R9 and R10 each independently represent a group represented by the formula (1A); and R11 and R12 each independently represent an alkyl group having 1 to 18 carbon atoms.

### Claim 5 (depends on 4)

The flame-retardant resin composition according to claim 4, wherein the second hindered amine-based compound includes a repeating unit represented by the following formula (4A):
where R13 represents a group containing a nitrogen atom; R14 and R15 each independently represent a group represented by the following formula (5A); and n represents an integer of 1 to 8,
where R16 represents a hydrogen atom, an alkyl group having 1 to 18 carbon atoms, a cycloalkyl group having 5 to 12 carbon atoms, an aralkyl group having 7 to 25 carbon atoms, or an aryl group having 6 to 12 carbon atoms; and R17 to R20 each independently represent an alkyl group having 1 to 8 carbon atoms.

### Claim 6 (depends on 1)

The flame-retardant resin composition according to claim 1, wherein the first hindered amine-based compound is blended in an amount of 0.1 part by mass or more and 1.2 parts by mass or less relative to 100 parts by mass of the base resin, and
the second hindered amine-based compound is blended in an amount of 0.1 part by mass or more and 1.2 parts by mass or less relative to 100 parts by mass of the base resin.

### Claim 7 (depends on 1)

The flame-retardant resin composition according to claim 1, further comprising calcium carbonate,
wherein the calcium carbonate is blended in an amount of more than 0 part by mass and 60 parts by mass or less relative to 100 parts by mass of the base resin.

### Claim 8 (depends on 1)

The flame-retardant resin composition according to claim 1, wherein the acid-modified polyolefin is a maleic anhydride-modified polyolefin.

### Claim 9 (depends on 1)

The flame-retardant resin composition according to claim 1, wherein the silicone compound is silicone gum.

### Claim 10 (depends on 1)

The flame-retardant resin composition according to claim 1, wherein the fatty acid-containing compound is magnesium stearate.

### Claim 11 (depends on 1)

An insulating wire, comprising:
a metal conductor; and
an insulating layer that covers the metal conductor,
wherein the insulating layer is composed of the flame-retardant resin composition according to claim 1.

### Claim 12 (depends on 1)

A metal cable, comprising:
an insulating wire including a metal conductor and an insulating layer covering the metal conductor; and
a covering layer covering the insulating wire,
wherein at least one of the insulating layer and the covering layer is composed of the flame-retardant resin composition according to claim 1.

### Claim 13 (depends on 1)

An optical fiber cable, comprising:
an optical fiber; and
a covering part covering the optical fiber,
wherein the covering part includes an insulating body directly covering the optical fiber cable, and
wherein the insulating body is composed of the flame-retardant resin composition according to claim 1.

### Claim 14 (depends on 1)

A molded article, comprising the flame-retardant resin composition according to claim 1.