# US 2017/0288237 A1 · Sealing member for a fuel cell

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- Number: US 2017/0288237 A1
- Document ID: US20170288237A1
- Status: Published application
- Kind: A1
- Application number: 15/294,309
- Filed: 2016-10-14
- Published: 2017-10-05
- Earliest claimed: 2016-03-31
- Assignees: Sumitomo Riko Company Limited
- Applicants: Sumitomo Riko Company Limited
- Inventors: Yusuke Nishikawa; Kenji Yamamoto
- Web page: https://patentgrep.com/patent/US20170288237A1

## CPC

- H01M 8/0284: Organic resins; Organic polymers
- C08K 5/098: Metal salts of carboxylic acids
- C08K 5/14: Peroxides
- C08L 23/16: Ethylene-propylene or ethylene-propylene-diene copolymers
- C08L 91/06: Waxes
- H01M 8/0273: with sealing or supporting means in the form of a frame
- H01M 2008/1095: {Fuel cells with polymeric electrolytes}
- Y02E 60/50: Fuel cells
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

Provided is a sealing member for a fuel cell, including a constituent member of a fuel cell and the sealing member bonded to each other through intermediation of an adhesive layer, or including the sealing members bonded to each other through intermediation of the adhesive layer, the sealing member including a cross-linked product of a rubber composition, in which the rubber composition contains the following components (A) to (C): (A) at least one rubber component selected from the group consisting of an ethylene-propylene rubber, an ethylene-propylene-diene rubber, and an ethylene-butene-diene rubber; (B) a cross-linking agent including an organic peroxide; and (C) at least one of a fatty acid potassium or a fatty acid sodium.

## Claims

### Claim 1

A sealing member for a fuel cell, comprising:
a cross-linked product of a rubber composition comprising the following components (A) to (C):
(A) at least one rubber component selected from the group consisting of an ethylene-propylene rubber, an ethylene-propylene-diene rubber, and an ethylene-butene-diene rubber;
(B) a cross-linking agent comprising an organic peroxide; and
(C) at least one selected from the group consisting of a fatty acid potassium and a fatty acid sodium.

### Claim 2 (depends on 1)

The sealing member for a fuel cell according to claim 1, wherein the component (C) is only the fatty acid potassium.

### Claim 3 (depends on 1)

The sealing member for a fuel cell according to claim 1, wherein the rubber composition has a content of the component (C) falling within a range of from 0.5 part by weight to 10 parts by weight with respect to 100 parts by weight of the rubber component (A).

### Claim 4 (depends on 1)

The sealing member for a fuel cell according to claim 1, wherein the rubber composition further comprises the following component (D):
(D) at least one of a paraffin oil or a poly-α-olefin compound.

### Claim 5 (depends on 1)

The sealing member for a fuel cell according to claim 1, wherein the rubber component (A) has an ethylene content of 60 wt. % or less.

### Claim 6 (depends on 1)

The sealing member for a fuel cell according to claim 1, wherein the cross-linking agent (B) comprises at least one selected from the group consisting of a peroxyketal, a peroxyester, a diacyl peroxide, a peroxydicarbonate, a dialkyl peroxide, and a hydroperoxide.

### Claim 7 (depends on 1)

The sealing member for a fuel cell according to claim 1, wherein the at least one selected from the group consisting of the fatty acid potassium and the fatty acid sodium (C) has a number of carbon atoms falling within a range of from 8 to 22.

### Claim 8 (depends on 1)

The sealing member for a fuel cell according to claim 1, wherein the fatty acid potassium comprises at least one selected from the group consisting of potassium caprylate, potassium caprate, potassium laurate, potassium myristate, potassium palmitate, potassium stearate, potassium oleate, and potassium behenate.

### Claim 9 (depends on 1)

The sealing member for a fuel cell according to claim 1, wherein the fatty acid sodium comprises at least one selected from the group consisting of sodium caprylate, caprate sodium, sodium laurate, sodium myristate, sodium palmitate, stearate sodium, sodium oleate, and sodium behenate.

### Claim 10 (depends on 4)

The sealing member for a fuel cell according to claim 4, wherein the poly-α-olefin compound has a kinematic viscosity at 100° C. of 8 mm2/s or less.