# US 2020/0399455 A1 · Rubber composition and hose

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- Number: US 2020/0399455 A1
- Document ID: US20200399455A1
- Status: Published application
- Kind: A1
- Application number: 16/758,608
- Filed: 2018-11-08
- Published: 2020-12-24
- Earliest claimed: 2017-11-10
- Assignees: The Yokohama Rubber Co., Ltd.
- Applicants: The Yokohama Rubber Co., Ltd.
- Inventors: Koki SUGIHARA
- Web page: https://patentgrep.com/patent/US20200399455A1

## CPC

- C08L 23/16: Ethylene-propylene or ethylene-propylene-diene copolymers
- C08K 3/06: Sulfur
- C08K 5/0016: {Plasticisers}
- C08K 5/01: Hydrocarbons {(C08K5/0091 takes precedence)}
- F16L 11/04: made of rubber or flexible plastics
- F16L 11/08: with reinforcements embedded in the wall (F16L11/11 takes precedence)
- C08L 2201/08: Stabilised against heat, light or radiation or oxydation
- C08L 2205/02: containing two or more polymers of the same C08L -group
- C08L 2314/06: Metallocene or single site catalysts
- 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)
- F16L: PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL

## Abstract

The present invention is to provide a rubber composition exhibiting excellent heat resistance, dimensional stability, and workability, and a hose. The present invention includes a rubber composition containing an ethylene-propylene-diene copolymer (A) containing an ethylene-propylene-diene copolymer (a1) obtained by using a metallocene catalyst, an ethylene-propylene copolymer having a weight average molecular weight of 35000 or less, and sulfur; and a hose formed by using the rubber composition.

## Claims

### Claim 1

A rubber composition comprising:
an ethylene-propylene-diene copolymer (A) containing an ethylene-propylene-diene copolymer (a1) obtained by using a metallocene catalyst;
an ethylene-propylene copolymer having a weight average molecular weight of 35000 or less; and
sulfur.

### Claim 2 (depends on 1)

The rubber composition according to claim 1, wherein a content of the ethylene-propylene copolymer is from 5 to 30 parts by mass per 100 parts by mass of the ethylene-propylene-diene copolymer (A).

### Claim 3 (depends on 1)

The rubber composition according to claim 1, further comprising a plasticizer,
a content of the plasticizer being 15 parts by mass or greater per 100 parts by mass of the ethylene-propylene-diene copolymer (A).

### Claim 4 (depends on 1)

The rubber composition according to claim 1, wherein a content of a diene repeating unit constituting the ethylene-propylene-diene copolymer (a1) is 8 mass % or less of an amount of the ethylene-propylene-diene copolymer (a1).

### Claim 5 (depends on 1)

The rubber composition according to claim 1, wherein a content of an ethylene repeating unit constituting the ethylene-propylene-diene copolymer (a1) is greater than 60 mass % of the amount of the ethylene-propylene-diene copolymer (a1).

### Claim 6 (depends on 1)

The rubber composition according to claim 1, wherein the weight average molecular weight of the ethylene-propylene copolymer is from 5000 to 25000.

### Claim 7 (depends on 1)

The rubber composition according to claim 1, wherein a content of the sulfur is from 0.3 to 1.5 parts by mass per 100 parts by mass of the ethylene-propylene-diene copolymer (A).

### Claim 8 (depends on 1)

The rubber composition according to claim 1, wherein a content of the ethylene-propylene-diene copolymer (a1) in 100 parts by mass of the ethylene-propylene-diene copolymer (A) is from 40 to 100 mass %.

### Claim 9 (depends on 1)

The rubber composition according to claim 1, wherein the rubber composition is used for a hose.

### Claim 10 (depends on 1)

A hose formed by using the rubber composition described in claim 1.