# US 12,014,848 B2 · Flame-retardant cable with self-extinguishing coating layer

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- Number: US 12,014,848 B2
- Document ID: US12014848B2
- Status: Granted
- Kind: B2
- Application number: 17/454,080
- Filed: 2021-11-09
- Published: 2022-05-12
- Granted: 2024-06-18
- Earliest claimed: 2020-11-11
- Assignees: Prysmian S.p.A.
- Applicants: Prysmian S.P.A.
- Inventors: Pauline Audebet; Vito Scrima; Luigi Caimi; Flavio Casiraghi
- Web page: https://patentgrep.com/patent/US12014848B2

## CPC

- H01B 7/295: using material resistant to flame
- C09D 5/18: Fireproof paints {including high temperature resistant paints}
- C09D 7/61: inorganic
- C09D 7/63: organic
- C09D 123/06: Polyethylene
- C09D 123/0853: {Vinylacetate}
- H01B 3/441: {from alkenes}
- C08K 3/016: Flame-proofing or flame-retarding additives
- C08K 3/22: of metals
- C08K 3/26: Carbonates; Bicarbonates
- C08K 3/346: {Clay}
- C08K 5/0066: {Flame-proofing or flame-retarding additives}
- C08K 5/34924: {containing cyanurate groups; Tautomers thereof}
- C08K 2003/2224: {Magnesium hydroxide}
- C08K 2003/2227: {of aluminium}
- C08K 2003/265: {Calcium, strontium or barium carbonate}
- C09K 21/00: Fireproofing materials (for use in a particular application, see the relevant places, e.g. fireproofing of wood B27K, of polymers C08, of textiles D06M, of paper D21H; fireproof paints C09D5/18)
- 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})
- C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D)
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE

## Abstract

A flame-retardant cable having a core is disclosed. The cable contains at least one conductor and a coating made from a low smoke zero halogen flame-retardant polymer composition. The polymer composition contains a halogen free base polymer added with a) less than 170 phr of at least one metal hydroxide; b) from 1 to 10 phr of a phyllosilicate clay; c) at least 1 phr and less than 10 phr of melamine or a derivative thereof; and d) an alkali or alkaline-earth metal carbonate. The cable has improved reaction to fire performances especially in that no dripping occurs during burning, which renders it compliant with the requirements of the more recent international standards.

## Claims

### Claim 1

A flame-retardant cable, the cable comprising
at least one conductor, and
a coating layer made from a low smoke zero halogen flame-retardant polymer composition comprising a halogen free base polymer added with:
a) from 100 phr to 160 phr of at least one metal hydroxide;
b) from 1 to 10 phr of a phyllosilicate clay;
c) at least 1 phr and less than 10 phr of melamine or a derivative thereof; and
d) from 20 to 70 phr of an alkali or alkaline-earth metal carbonate.

### Claim 2 (depends on 1)

The cable according to claim 1, wherein the coating layer is the outermost layer of the cable.

### Claim 3 (depends on 1)

The cable according to claim 1, wherein the base polymer is at least one selected from the group consisting of a thermoplastic polymer and a crosslinked polymer.

### Claim 4 (depends on 1)

The cable according to claim 1, wherein the base polymer includes at least one ethylene homopolymer or copolymer having a density of equal to or less than 0.94 g/cm3.

### Claim 5 (depends on 1)

The cable according to claim 1, wherein the base polymer comprises a mixture of a LLDPE or a VLDPE, and an ethylene vinyl acetate copolymer.

### Claim 6 (depends on 1)

The cable according to claim 1, wherein the metal hydroxide is magnesium hydroxide or aluminium hydroxide.

### Claim 7 (depends on 1)

The cable according to claim 1, wherein an amount of the phyllosilicate clay in the flame-retardant polymer composition ranges from 2 to 6 phr.

### Claim 8 (depends on 1)

The cable according to claim 1, wherein the phyllosilicate clay is montmorillonite or bentonite.

### Claim 9 (depends on 1)

The cable according to claim 1, wherein the phyllosilicate clay is chemically modified.

### Claim 10 (depends on 1)

The cable according to claim 1, wherein the flame-retardant polymer composition comprises a melamine derivative, which is at least one melamine cyanurate.

### Claim 11 (depends on 1)

The cable according to claim 1, wherein the alkali or alkaline-earth metal carbonate is selected from the group consisting of sodium carbonate, magnesium carbonate, calcium carbonate, and a mixture thereof.

### Claim 12 (depends on 1)

The cable according to claim 1, wherein the flame-retardant polymer composition further comprises an anhydride-modified polyethylene as a coupling agent.

### Claim 13 (depends on 12)

The cable according to claim 12, wherein an amount of the anhydride-modified polyethylene in the flame-retardant polymer composition ranges from 5 to 12 phr.

### Claim 14

A flame-retardant cable, the cable comprising
at least one conductor, and
a coating layer made from a low smoke zero halogen flame-retardant polymer composition comprising a halogen free base polymer added with:
a) less than 170 phr of at least one metal hydroxide;
b) from 1 to 10 phr of a phyllosilicate clay;
c) at least 1 phr and less than 10 phr of melamine or a derivative thereof; and
d) an alkali or alkaline-earth metal carbonate,
wherein the phyllosilicate clay has an average particle size of from 5 to 35 μm.