# US 10,483,017 B2 · Flame retardant resin composition, cable using same and optical fiber cable

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- Number: US 10,483,017 B2
- Document ID: US10483017B2
- Status: Granted
- Kind: B2
- Application number: 15/506,304
- Filed: 2015-08-25
- Published: 2017-09-21
- Granted: 2019-11-19
- Earliest claimed: 2014-08-25
- Assignees: Fujikura Ltd.
- Applicants: Fujikura Ltd.
- Inventors: Nao Nishida; Seiichi Taira; Shoichiro Nakamura
- Web page: https://patentgrep.com/patent/US10483017B2

## CPC

- H01B 7/295: using material resistant to flame
- C08K 3/26: Carbonates; Bicarbonates
- C08K 5/09: Carboxylic acids; Metal salts thereof; Anhydrides thereof
- C08L 23/06: Polyethylene
- C08L 23/26: modified by chemical after-treatment (saponified copolymers C08L23/0861; unsaturated acid salts C08L23/0876)
- C08L 83/04: Polysiloxanes
- G02B 6/44: Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables (cables incorporating electric conductors and optical fibres {where features relating to the optical fibres are not of interest} H01B11/22)
- G02B 6/4429: {Means specially adapted for strengthening or protecting the cables}
- H01B 3/00: Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B 3/427: {Polyethers}
- H01B 3/44: vinyl resins; acrylic resins (silicones H01B3/46)
- H01B 3/46: silicones
- H01B 7/00: Insulated conductors or cables characterised by their form
- H01B 7/02: Disposition of insulation
- C08K 2003/265: {Calcium, strontium or barium carbonate}
- C08L 2207/062: HDPE
- C08L 2207/066: LDPE (radical process)
- 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)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

A flame retardant resin composition including a base resin including 18 to 85% by mass of a high density polyethylene, 9 to 69% by mass of a low density polyethylene, and 3 to 25% by mass of an acid-modified polyolefin compound, and 25 parts by mass to 110 parts by mass of calcium carbonate particles, more than 1 part by mass to 10 parts by mass of a silicone-based compound, and 2 parts by mass to 20 parts by mass of a fatty acid-containing compound, each on the basis of 100 parts by mass of the base resin.

## Claims

### Claim 1

A flame retardant resin composition consisting essentially of:
a base resin comprising 18 to 85% by mass of a high density polyethylene, 9 to 69% by mass of a low density polyethylene, and 3 to 25% by mass of a maleic anhydride modified ethylene-α olefin copolymer, and
25 parts by mass to 110 parts by mass of calcium carbonate particles, more than 1 part by mass to 10 parts by mass of a silicone-based compound, and 2 parts by mass to 20 parts by mass of a fatty acid-containing compound, each on the basis of 100 parts by mass of the base resin.

### Claim 2 (depends on 1)

The flame retardant resin composition according to claim 1, wherein the maleic anhydride modified ethylene-α olefin copolymer is maleic anhydride modified ethylene-1-butene copolymer.

### Claim 3 (depends on 1)

The flame retardant resin composition according to claim 1, wherein a density of the high density polyethylene is 945 kg/m3 or more, and a density of the low density polyethylene is from 880 kg/m3 to 925 kg/m3.

### Claim 4 (depends on 1)

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

### Claim 5 (depends on 1)

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

### Claim 6 (depends on 1)

An optical fiber cable comprising an optical fiber and an insulating layer covering the optical fiber, wherein the insulating layer is composed of the flame retardant resin composition according to claim 1.

### Claim 7 (depends on 1)

A cable comprising a conductor and an insulating layer covering the conductor, wherein the insulating layer is composed of the flame retardant resin composition according to claim 1.

### Claim 8 (depends on 1)

The flame retardant resin composition according to claim 1, wherein the content of the maleic anhydride modified ethylene-α olefin copolymer is 5 to 20% by mass.

### Claim 9 (depends on 1)

The flame retardant resin composition according to claim 1, wherein the average particle diameter of the calcium carbonate particles is from 0.7 μm to 3.6 μm.