# US 11,028,260 B2 · Rubber composition, rubber molded body, and method for production of rubber molded body

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- Number: US 11,028,260 B2
- Document ID: US11028260B2
- Status: Granted
- Kind: B2
- Application number: 16/313,508
- Filed: 2017-06-27
- Published: 2019-07-25
- Granted: 2021-06-08
- Earliest claimed: 2016-06-28
- Assignees: Sumitomo Chemical Company, Limited
- Applicants: Sumitomo Chemical Company, Limited
- Inventors: Takashi Sakai; Sadayuki Nakano
- Web page: https://patentgrep.com/patent/US11028260B2

## CPC

- C08L 23/16: Ethylene-propylene or ethylene-propylene-diene copolymers
- C08K 3/016: Flame-proofing or flame-retarding additives
- C08K 3/04: Carbon
- C08K 3/28: Nitrogen-containing compounds
- C08K 3/32: Phosphorus-containing compounds
- C08K 5/0066: {Flame-proofing or flame-retarding additives}
- C08K 5/17: Amines; Quaternary ammonium compounds
- C08K 5/3462: Six-membered rings
- C08K 5/49: Phosphorus-containing compounds {(C08K5/0091 takes precedence)}
- C08K 5/5205: {Salts of P-acids with N-bases}
- C08K 7/22: Expanded, porous or hollow particles
- C08K 7/24: inorganic
- C08L 23/08: Copolymers of ethene (C08L23/16 takes precedence)
- C08K 3/36: Silica
- C08K 2003/329: {Phosphorus containing acids}
- C08L 2201/02: Flame or fire retardant/resistant
- C08L 2203/30: used for thermoforming
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)

## Abstract

A rubber composition contains: (A) an ethylene-α-olefin-based copolymer rubber including an ethylene unit and an α-olefin unit having 3 or more carbon atoms; (B) a fire retardant including a phosphorus atom and a nitrogen atom; (C) a thermally expandable graphite; and (D) additive particles that are porous particles or particles having ion exchangeability. A content of the fire retardant is 50 to 250 parts by mass and a content of the additive particles is 15 parts by mass or less with respect to 100 parts by mass of the ethylene-α-olefin-based copolymer rubber.

## Claims

### Claim 1

A rubber composition comprising:
(A) an ethylene-α-olefin-based copolymer rubber comprising an ethylene unit and an α-olefin unit having 3 or more carbon atoms;
(B) a fire retardant comprising a phosphate salt formed from phosphoric acid or a polyphosphoric acid and alkylene polyamine or polyalkylene polyamine;
(C) a thermally expandable graphite; and
(D) additive particles that are porous particles or particles having ion exchangeability, wherein the additive particles are silica particles, hydrotalcite particles, or a combination thereof, and wherein
a content of the fire retardant is 50 to 250 parts by mass and a content of the additive particles is 0.5 parts by mass to 10 parts by mass with respect to 100 parts by mass of the ethylene-α-olefin-based copolymer rubber.

### Claim 2 (depends on 1)

The rubber composition according to claim 1, wherein the content of the additive particles is 5 parts by mass or less with respect to 100 parts by mass of the ethylene-α-olefin-based copolymer rubber.

### Claim 3 (depends on 1)

The rubber composition according to claim 1, wherein the ethylene-α-olefin-based copolymer rubber further comprising a nonconjugated polyene unit.

### Claim 4 (depends on 1)

A rubber molded body comprising the rubber composition according to claim 1 and/or a vulcanizate thereof.

### Claim 5 (depends on 1)

A method for producing a rubber molded body, comprising heat-molding the rubber composition according to claim 1 in a mold.