# US 2013/0240239 A1 · Phosphorus-free based halogen-free flame-retardant resin composition, phosphorus-free based halogen-free flame-retardant insulated electric wire and phosphorus-free based halogen-free flame-retardant cable

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- Number: US 2013/0240239 A1
- Document ID: US20130240239A1
- Status: Published application
- Kind: A1
- Application number: 13/796,425
- Filed: 2013-03-12
- Published: 2013-09-19
- Earliest claimed: 2012-03-14
- Assignees: Hitachi Cable, Ltd.
- Applicants: Hitachi Cable, Ltd.
- Inventors: Hitoshi KIMURA; Motoharu KAJIYAMA; Takuya SUZUKI
- Web page: https://patentgrep.com/patent/US20130240239A1

## CPC

- C09K 21/14: Macromolecular materials
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE

## Abstract

A phosphorus-free based halogen-free flame-retardant resin composition includes a base polymer including a copolymer of ethylene and α-olefin having carbon number of 3 to 8 polymerized by a metallocene catalyst as a main component, and 5 to 30 weight % of an ethylene-vinyl acetate copolymer that has a melt flow rate of not less than 50 g/min and a vinyl acetate content of not less than 40%, a metal hydroxide blended with the base polymer in a ratio of 100 to 250 parts by weight relative to 100 parts by weight of the base polymer, and a mineral oil blended with the base polymer in a ratio of 1 to 20 parts by weight relative to 100 parts by weight of the base polymer.

## Claims

### Claim 1

A phosphorus-free based halogen-free flame-retardant resin composition, comprising:
a base polymer comprising a copolymer of ethylene and α-olefin having carbon number of 3 to 8 polymerized by a metallocene catalyst as a main component, and 5 to 30 weight % of an ethylene-vinyl acetate copolymer that has a melt flow rate of not less than 50 g/min and a vinyl acetate content of not less than 40%;
a metal hydroxide blended with the base polymer in a ratio of 100 to 250 parts by weight relative to 100 parts by weight of the base polymer; and
a mineral oil blended with the base polymer in a ratio of 1 to 20 parts by weight relative to 100 parts by weight of the base polymer.

### Claim 2 (depends on 1)

The resin composition according to claim 1, wherein the copolymer of ethylene and α-olefin comprises one of ethylene propylene copolymer, ethylene butene copolymer, ethylene hexene copolymer and octene propylene copolymer.

### Claim 3 (depends on 1)

The resin composition according to claim 1, wherein the metal hydroxide comprises one of magnesium hydroxide, aluminum hydroxide and calcium hydroxide.

### Claim 4 (depends on 1)

The resin composition according to claim 1, wherein the mineral oil comprises one of paraffin base oil, naphthene base oil and aroma based oil.

### Claim 5 (depends on 1)

A phosphorus-free based halogen-free flame-retardant insulated electric wire, comprising:
a conductor; and
an insulation layer formed on a periphery of the conductor and comprising the phosphorus-free based halogen-free flame-retardant resin composition according to claim 1.

### Claim 6 (depends on 1)

A phosphorus-free based halogen-free flame-retardant cable, comprising:
an insulated electric wire comprising a conductor and an insulation layer formed on a periphery of the conductor; and
a sheath formed on a periphery of the insulated electric wire and comprising the phosphorus-free based halogen-free flame-retardant resin composition according to claim 1.