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EP-4742332-A1 - GASKET MEMBER FOR FUEL CELL

EP4742332A1EP 4742332 A1EP4742332 A1EP 4742332A1EP-4742332-A1

Abstract

A gasket member for a fuel cell, the gasket member including: a substrate layer; an d adhesive layers arranged on both sides of the substrate layer, in which the substrate layer c ontains polyimide, and has a stress at break of 50 N/mm 2 or more and an elongation at break of 50% or more.

Inventors

  • MIYAZAWA, YUKI
  • IWATSUKI, KEIGO
  • ONABE, TAKAYUKI

Assignees

  • Toagosei Co., Ltd.

Dates

Publication Date
20260513
Application Date
20240628

Claims (4)

  1. A gasket member for a fuel cell, the gasket member comprising a substrate layer an d adhesive layers arranged on both sides of the substrate layer, wherein the substrate layer co mprises polyimide, and has a stress at break of 50 N/mm 2 or more and an elongation at break of 50% or more.
  2. The gasket member for a fuel cell according to claim 1, wherein the substrate layer has a retention rate of elongation at break of 50% or more after being held in water at 120°C for 3000 hours.
  3. The gasket member for a fuel cell according to claim 1 or 2, wherein the substrate 1 ayer has a retention rate of stress at break of 100% or less after being held in water at 120°C for 3000 hours.
  4. The gasket member for a fuel cell according to claim 1 or 2, wherein a primer layer is further disposed between the substrate layer and the adhesive layer.

Description

TECHNICAL FIELD The present disclosure relates to a gasket member for a fuel cell. BACKGROUND ART In recent years, hot-melt adhesive compositions have come to be used as adhesive f ilms or sheets (hereinafter, collectively referred to as "adhesive members") for chemical batt eries such as lithium ion batteries and fuel cells incorporated in notebook computers, smartph ones, tablets, automobiles and the like, and physical batteries such as solar batteries and capa citors. In order to bond metal substrates such as iron, aluminum, titanium, other metals, and a lloys thereof, which are used for substrates of constituent members of these batteries, it is kn own that a relatively good adhesive strength is obtained when a hot-melt adhesive compositi on containing an olefinic thermoplastic resin modified with an acid (hereinafter, also referred to as "acid-modified polyolefin") as a main component is used. As for battery applications, for example, the fuel cell is operated in a humidified at mosphere in order to improve proton conductivity of an electrolyte membrane, and since wat er is generated by a power generation reaction, a member constituting the fuel cell is required to have high hydrolysis resistance. In addition, since power density can be improved by incr easing an operating temperature of the fuel cell, the fuel cell is required to be used in a high-t emperature environment (for example, 100°C or higher) from the viewpoint of downsizing th e fuel cell. As a technique for improving hydrolysis resistance of a gasket member, among me mbers constituting a fuel cell, in the high-temperature environment, for example, Patent Liter ature 1 describes a gasket member for a solid polymer fuel cell, the gasket member including a laminate including at least a substrate layer and adhesive layers arranged on both sides of t he substrate layer, in which the laminate has a retention rate of elongation at break of 60% or more after being left standing in water at 120°C for 300 hours. Patent Literature 2 describes a gasket member for a solid polymer fuel cell, the gasket member including a laminate includ ing at least a substrate layer and adhesive layers arranged on both sides of the substrate layer, in which the substrate layer contains polyphenylsulfone. PRIOR ART DOCUMENT PATENT DOCUMENT Patent Literature 1: WO 2022/172983 APatent Literature 2: WO 2022/172985 A SUMMARY OF INVENTION TECHNICAL PROBLEM An object of an embodiment of the present disclosure is to provide a gasket membe r for a fuel cell having excellent adhesion durability in an environment at a high temperature and in the presence of moisture. SOLUTION TO PROBLEMS Means for solving the above problems include the following aspects. [1] A gasket member for a fuel cell, the gasket member comprising: a substrate layer and adh esive layers arranged on both sides of the substrate layer, in which the substrate layer contain s polyimide, and has a stress at break of 50 N/mm2 or more and an elongation at break of 50 % or more.[2] The gasket member for a fuel cell according to [1], in which the substrate layer has a rete ntion rate of elongation at break of 50% or more after being held in water at 120°C for 3000 hours.[3] The gasket member for a fuel cell according to [1] or [2], in which the substrate layer has a retention rate of stress at break of 100% or less after being held in water at 120°C for 3000 hours.[4] The gasket member for a fuel cell according to any one of [1] to [3], in which a primer la yer is further disposed between the substrate layer and the adhesive layer. EFFECTS OF INVENTION According to an embodiment of the present disclosure, it is possible to provide a ga sket member for a fuel cell, the gasket member having excellent adhesion durability in an en vironment at a high temperature and in the presence of moisture. DESCRIPTION OF EMBODIMENTS Hereinafter, a gasket member for a fuel cell according to the present disclosure will be described in detail. The following description may be made based on a representative em bodiment of the gasket member for a fuel cell according to the present disclosure, but the gas ket member for a fuel cell according to the present disclosure is not limited to such embodim ents and can be implemented with appropriate modifications within the scope of the object of the present disclosure. In the present disclosure, a numerical range represented by "to" means a range incl uding numerical values described before and after "to" as a lower limit value and an upper li mit value. In the present disclosure, "high temperature" means 100°C or higher. In the present disclosure, "environment where moisture exists" is, for example, an environme nt where an object is held in water. In the numerical range described stepwise in the present disclosure, the upper limit value or the lower limit value described in a certain numerical range may be replaced with an upper limit value or a lower limit value of another numerical range. In