# US 10,501,609 B2 · Hose rubber composition and hydraulic hose

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- Number: US 10,501,609 B2
- Document ID: US10501609B2
- Status: Granted
- Kind: B2
- Application number: 15/756,153
- Filed: 2016-08-30
- Published: 2018-09-27
- Granted: 2019-12-10
- Earliest claimed: 2015-09-16
- Assignees: Bridgestone Corporation
- Applicants: Bridgestone Corporation
- Inventors: Youhei Tsunenishi; Sho Ochiai
- Web page: https://patentgrep.com/patent/US10501609B2

## CPC

- C08L 9/02: Copolymers with acrylonitrile
- C08L 23/16: Ethylene-propylene or ethylene-propylene-diene copolymers
- F16L 11/04: made of rubber or flexible plastics
- F16L 11/085: {comprising one or more braided layers (in combination with layers of a helically wound core or wire F16L11/088)}
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- F16L: PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL

## Abstract

Provided is a hose rubber composition having improved adhesiveness to wires while maintaining rubber characteristics, and containing: acrylonitrile-butadiene rubber (NBR) and ethylene-propylene-diene rubber (EPDM) as rubber components; and further containing: a cobalt salt of an organic acid and hydrotalcite, in which 0.5 to 5 parts by mass of the hydrotalcite is contained with respect to 100 parts by mass of the rubber components.

## Claims

### Claim 1

A hose rubber composition, comprising:
acrylonitrile-butadiene rubber (NBR) and ethylene-propylene-diene rubber (EPDM), as rubber components; and
a cobalt salt of an organic acid and hydrotalcite,
wherein the cobalt salt of an organic acid is cobalt versatate,
wherein 0.5 to 5 parts by mass of the hydrotalcite is contained with respect to 100 parts by mass of the rubber components.

### Claim 2 (depends on 1)

The hose rubber composition according to claim 1, wherein 1 to 5 parts by mass of the cobalt salt of an organic acid is contained with respect to 100 parts by mass of the rubber components.

### Claim 3 (depends on 1)

The hose rubber composition according to claim 1, wherein a mass ratio (NBR/EPDM) of the acrylonitrile-butadiene rubber (NBR) to the ethylene-propylene-diene rubber (EPDM) is 55/45 to 75/25.

### Claim 4 (depends on 1)

A hydraulic hose comprising the hose rubber composition according to claim 1.

### Claim 5 (depends on 2)

The hose rubber composition according to claim 2, wherein the cobalt salt of an organic acid comprises cobalt versatate.

### Claim 6 (depends on 2)

The hose rubber composition according to claim 2, wherein a mass ratio (NBR/EPDM) of the acrylonitrile-butadiene rubber (NBR) to the ethylene-propylene-diene rubber (EPDM) is 55/45 to 75/25.

### Claim 7 (depends on 2)

A hydraulic hose comprising the hose rubber composition according to claim 2.

### Claim 8 (depends on 1)

The hose rubber composition according to claim 1, wherein a mass ratio (NBR/EPDM) of the acrylonitrile-butadiene rubber (NBR) to the ethylene-propylene-diene rubber (EPDM) is 55/45 to 75/25.

### Claim 9 (depends on 1)

A hydraulic hose comprising the hose rubber composition according to claim 1.

### Claim 10 (depends on 3)

A hydraulic hose comprising the hose rubber composition according to claim 3.

### Claim 11 (depends on 5)

The hose rubber composition according to claim 5, wherein a mass ratio (NBR/EPDM) of the acrylonitrile-butadiene rubber (NBR) to the ethylene-propylene-diene rubber (EPDM) is 55/45 to 75/25.

### Claim 12 (depends on 5)

A hydraulic hose comprising the hose rubber composition according to claim 5.

### Claim 13 (depends on 6)

A hydraulic hose comprising the hose rubber composition according to claim 6.

### Claim 14 (depends on 8)

A hydraulic hose comprising the hose rubber composition according to claim 8.

### Claim 15 (depends on 11)

A hydraulic hose comprising the hose rubber composition according to claim 11.