# US 5,707,732 A · Flame retardant cable

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 5,707,732 A
- Document ID: US5707732A
- Status: Granted
- Kind: A
- Application number: 08/677,941
- Filed: 1996-07-10
- Granted: 1998-01-13
- Earliest claimed: 1995-07-31
- Assignees: Nippon Unicar Company Limited
- Inventors: Masazumi Sonoda; Katsuhiro Horita
- Web page: https://patentgrep.com/patent/US5707732A

## CPC

- H01B 7/295: using material resistant to flame
- C08L 23/0815: {with aliphatic 1-olefins containing one carbon-to-carbon double bond}
- C08L 23/0853: Ethylene vinyl acetate copolymers
- G02B 6/4436: {Heat resistant}
- H01B 3/441: {from alkenes}
- C08L 2205/02: containing two or more polymers of the same C08L -group
- C08L 2314/06: Metallocene or single site catalysts
- Y10S 428/92: Fire or heat protection feature
- Y10S 428/921: Fire or flameproofing
- Y10T 428/29: Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
- Y10T 428/2933: Coated or with bond, impregnation or core
- 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})
- 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
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A cable comprising one or more electrical conductors or communications media, or a core of two or more electrical conductors or communications media, each electrical conductor, communications medium, or core being surrounded by a composition, which is essentially halogen free, comprising 100 parts by weight of a mixture of resins and 5 to 250 parts by weight of a flame retardant compound, which is either magnesium hydroxide, coated or uncoated, or aluminum trihydrate, wherein the resins in the mixture are as follows: (i) a polyethylene made using a metallocene single site catalyst system, said polyethylene having an Mw/Mn ratio of no greater than about 3; (ii) a polyethylene made using a transition metal catalyst system other than a metallocene single site catalyst system, said polyethylene having an Mw/Mn ratio greater than about 4; (iii) optionally, a copolymer of ethylene and an unsaturated ester or a very low density polyethylene having a density no greater than 0.915 gram per cubic centimeter, wherein resins (i) or (ii) are modified with an unsaturated aliphatic diacid anhydride through grafting or copolymerization.

## Claims

### Claim 1

A cable comprising one or more electrical conductors or communications media, or a core of two or more electrical conductors or communications media, each electrical conductor, communications medium, or core being surrounded by a composition, which is essentially halogen free, comprising 100 parts by weight of a mixture of resins and 5 to 250 parts by weight of a flame retardant compound, which is either magnesium hydroxide, coated or uncoated, or aluminum trihydrate, wherein the resins in the mixture are as follows:
(i) about 55 to about 98 parts by weight of a polyethylene made using a metallocene single site catalyst system, said polyethylene having an Mw/Mn ratio of no greater than about 3; and
(ii) about 2 to about 45 parts by weight of a polyethylene made using a transition metal catalyst system other than a metallocene single site catalyst system, said polyethylene having an Mw/Mn ratio greater than about 4;
wherein resins (i) or (ii) are modified with an unsaturated aliphatic diacid anhydride through grafting or copolymerization.

### Claim 2

A cable comprising one or more electrical conductors or communications media, or a core of two or more electrical conductors or communications media, each electrical conductor, communications medium, or core being surrounded by a composition, which is essentially halogen free, comprising 100 parts by weight of a mixture of resins and 5 to 250 parts by weight of a flame retardant compound, which is either magnesium hydroxide, coated or uncoated, or aluminum trihydrate, wherein the resins in the mixture are as follows:
(i) about 5 to about 35 parts by weight of a polyethylene made using a metallocene single site catalyst system, said polyethylene having an Mw/Mn ratio of no greater than about 3;
(ii) about 5 to about 35 parts by weight of a polyethylene made using a transition metal catalyst system other than a metallocene single site catalyst system, said polyethylene having an Mw/Mn ratio greater than about 4; and
(iii) about 60 to about 90 parts by weight of a copolymer of ethylene and an unsaturated ester or a very low density polyethylene having a density no greater than 0.915 gram per cubic centimeter
wherein resins (i) or (ii) are modified with an unsaturated aliphatic diacid anhydride through grafting or copolymerization.

### Claim 3

A cable comprising one or more electrical conductors or communications media, or a core of two or more electrical conductors or communications media, each electrical conductor, communications medium, or core being surrounded by a composition, which is essentially halogen free, comprising 100 parts by weight of a mixture of resins and 5 to 250 parts by weight of a flame retardant compound, which is either magnesium hydroxide, coated or uncoated, or aluminum trihydrate, wherein the resins in the mixture are as follows:
(i) about 2 to about 40 parts by weight of a polyethylene made using a metallocene single site catalyst system, said polyethylene having an Mw/Mn ratio of no greater than about 3; and
(ii) about 60 to about 98 parts by weight of a copolymer of ethylene and an unsaturated ester or a very low density polyethylene having a density no greater than 0.915 gram per cubic centimeter
wherein resin (i) is modified with an unsaturated aliphatic diacid anhydride through grafting or copolymerization.

### Claim 4 (depends on 3)

The cable defined in claim 3 wherein the flame retardant compound is present in an amount of about 5 to about 150 parts by weight.

### Claim 5 (depends on 1)

The cable defined in claim 1 wherein resin (i) is modified with an unsaturated aliphatic diacid anhydride.

### Claim 6 (depends on 1)

The cable defined in claim 1 wherein resin (ii) is modified with an unsaturated aliphatic diacid anhydride.

### Claim 7 (depends on 2)

The cable defined in claim 2 whereto resin (i) is modified with an unsaturated aliphatic diacid anhydride.

### Claim 8 (depends on 2)

The cable defined in claim 2 wherein resin (ii) is modified with an unsaturated aliphatic diacid anhydride.

### Claim 9 (depends on 7)

The cable defined in claim 7 wherein resin (iii) is a copolymer of ethylene and vinyl acetate or ethyl acrylate.

### Claim 10 (depends on 8)

The cable defined in claim 8 whereto resin (iii) is a copolymer of ethylene and vinyl acetate or ethyl acrylate.

### Claim 11 (depends on 3)

The cable defined in claim 3 wherein resin (ii) is a copolymer of ethylene and vinyl acetate or ethyl acrylate.