KR20180017584A - Pressure sensitive adhesive, sub-gasket film for fuel cell comprising the same, membrane electrode assembly comprising the same and fuel cell stack comprising the same - Google Patents

Abstract

The present application relates to an adhesive composition, a sub-gasket film for a fuel cell comprising the same, a membrane electrode assembly comprising the same, a fuel cell stack comprising the same and a method for manufacturing fuel cell stack, and provides the adhesive composition having excellent reworkability, no defects such as bubble formation at the time of laminating, and excellent adhesion and durability after a final laminating process, and also provides the sub-gasket film for the fuel cell comprising the same.

Description

TECHNICAL FIELD [0001] The present invention relates to a pressure-sensitive adhesive composition, a sub-gasket film for a fuel cell comprising the same, a membrane electrode assembly including the same, and a fuel cell stack including the membrane electrode assembly. STACK COMPRISING THE SAME}

The present invention relates to a pressure-sensitive adhesive composition, a sub gasket film for a fuel cell comprising the same, a membrane electrode assembly including the same, a fuel cell stack including the membrane electrode assembly, and a method of manufacturing the fuel cell stack.

BACKGROUND ART A fuel cell is a power generation system that directly converts energy released by an oxidation reaction into an electric energy by oxidizing a fuel by an electrochemical process and includes both sides of an electrolyte membrane for selectively transporting hydrogen ions And a plurality of membrane-electrode assemblies (junction bodies) sandwiched and supported by pairs of electrodes.

The gasket used in the fuel cell stack prevents gas or liquid from leaking from the contact surface. However, when the gasket is used alone, it is impossible to completely block the leakage of the liquid or gas, A sub gasket film was applied.

The subgasket film should have low adhesive force to facilitate initial reworkability with the electrolyte membrane, and should not have problems such as bubbling or rubbing during jointing, and the adhesive strength after the final hot pressing process should be kept high.

Patent Document 1: Korean Laid-Open Publication No. 10-2016-0033909

The present invention relates to a pressure-sensitive adhesive composition for a sub-gasket film to be applied to a fuel cell, which is excellent in re-workability, has no defects such as bubble formation at the time of lamination, and exhibits excellent adhesion and durability after final lamination A sub gasket film for a fuel cell.

The present application relates to a pressure-sensitive adhesive composition. The pressure-sensitive adhesive composition may be included in a sub gasket film applied to a fuel cell. In one example, the pressure-sensitive adhesive composition may comprise a polymer having a first polymerization unit derived from a monomer having a glass transition temperature of 0 ° C or higher and a second polymerization unit derived from a monomer represented by the following formula (1). As described above, the monomer constituting the first polymerization unit may have a glass transition temperature of 0 ° C or higher, more specifically 10 ° C or higher, 20 ° C or higher, 30 ° C or higher, 50 ° C or higher, Lt; / RTI >

[Chemical Formula 1]

Wherein R ₁ is an alkyl group, an alkenyl group, an alkynyl group, an alkoxy group or an aryl group, R ₂ is a polymerizable functional group, and X is oxygen or nitrogen. R ₁ may be an alkyl group, an alkenyl group, an alkynyl group, an alkoxy group or an aryl group having a carbon number of 1 to 10, 1 to 8, or 1 to 5. The polymerizable functional group may be an alkenyl group, an acryloyl group, a methacryloyl group, an acryloyloxy group or a methacryloyloxy group. The monomer is not particularly limited as long as it satisfies the structure of the formula (1). For example, the monomer of the formula (1) may include vinyl acetate.

The present application relates to a pressure-sensitive adhesive composition comprising a first polymerized unit and a second polymerized unit, wherein the polymer constituting the pressure-sensitive adhesive composition has excellent re-workability and no defects such as bubbling during lamination and excellent adhesion and durability Can be implemented.

In one example, the second polymerized unit and the first polymerized unit are respectively 50 to 90 parts by weight and 10 to 40 parts by weight; 60 to 90 parts by weight and 10 to 35 parts by weight; 70 to 90 parts by weight and 10 to 25 parts by weight; Or 75 to 90 parts by weight and 12 to 20 parts by weight. Within the above range, the present application can provide a pressure-sensitive adhesive having physical properties capable of maintaining excellent durability in the final product while keeping the initial adhesive force low.

In the embodiments of the present application, the monomer having a glass transition temperature of 0 ° C or higher is not particularly limited, and examples thereof include methyl (meth) acrylate, t-butyl (meth) acrylate, isobornyl acrylate, cyclohexyl (Meth) acrylate, styrene, vinyl acetate, isopropyl methacrylate, N-vinyl formamide, benzyl acrylate, or mixtures thereof.

In one example, the monomer having a glass transition temperature of 0 ° C or higher or the monomer represented by the formula (1) may not contain a reactive functional group. The reactive functional group may be, for example, a hydroxy group or a carboxyl group. In the present application, the desired adhesion can be achieved by limiting the kinds of monomers as described above. As described above, the monomer constituting the first polymerization unit may have a glass transition temperature of 0 ° C or higher, more specifically 10 ° C or higher, 20 ° C or higher, 30 ° C or higher, 50 ° C or higher, Lt; / RTI > By controlling the glass transition temperature of the monomer constituting the first polymerization unit of the polymer within the above range, the present application can provide high adhesion and durability after the final laminating step while lowering the initial adhesion.

In the present specification, the term " monomer having a glass transition temperature of 0 deg. C or higher " may mean that a glass transition temperature measured or calculated from a polymer in the form of a homopolymer formed of only the monomer is 0 deg. In addition, the term "polymerized units derived from a monomer" in the present application means that at least one of the polymerized units of the polymer is composed of the monomer.

In one example, the monomer having a glass transition temperature of 0 ° C or higher may comprise a compound of the following formula (2).

(2)

In Formula 2, R may be hydrogen or an alkyl group having 1 to 4 carbon atoms, 1 to 3 carbon atoms, or 1 to 2 carbon atoms. In Formula 2, P may be an aliphatic cyclic monovalent residue of 3 to 30 carbon atoms or an aliphatic saturated hydrocarbon cyclic monovalent residue. In Formula 2, P is preferably a monovalent residue derived from an aliphatic saturated hydrocarbon ring compound having 3 to 25 carbon atoms, 6 to 20 carbon atoms, or 8 to 15 carbon atoms. Examples of the compound of Formula 2 include isobornyl (meth) acrylate, cyclohexyl (meth) acrylate, norbornanyl (meth) acrylate, norbornenyl ( (Meth) acrylate, dicyclopentadienyl (meth) acrylate, ethynylcyclohexane (meth) acrylate, ethynylcyclohexene (meth) acrylate or ethynyldecahydronaphthalene But isobornyl (meth) acrylate may be used, but is not limited thereto.

The term "alkyl group" as used herein means an alkyl group having 1 to 30 carbon atoms, 1 to 25 carbon atoms, 1 to 20 carbon atoms, 1 to 16 carbon atoms, 1 to 12 carbon atoms, 1 to 8 carbon atoms or 1 to 4 carbon atoms ≪ / RTI > The alkyl group may have a linear, branched or cyclic structure and may optionally be substituted with one or more substituents.

The term "alkoxy group" as used herein may mean an alkoxy group having 1 to 20 carbon atoms, 1 to 16 carbon atoms, 1 to 12 carbon atoms, 1 to 8 carbon atoms or 1 to 4 carbon atoms, unless otherwise specified. The alkoxy group may be linear, branched or cyclic. In addition, the alkoxy group may be optionally substituted with one or more substituents.

Unless otherwise specified, the term "alkenyl group" as used herein may mean an alkenyl group having 2 to 20 carbon atoms, 2 to 16 carbon atoms, 2 to 12 carbon atoms, 2 to 8 carbon atoms, or 2 to 4 carbon atoms have. The alkenyl group may be linear, branched or cyclic. In addition, the alkenyl group may be optionally substituted with one or more substituents.

Unless otherwise specified, the term "alkynyl group" as used herein may mean an alkenyl group having 2 to 20 carbon atoms, 2 to 16 carbon atoms, 2 to 12 carbon atoms, 2 to 8 carbon atoms, or 2 to 4 carbon atoms have. The alkenyl group may be linear, branched or cyclic. In addition, the alkynyl group may be optionally substituted with one or more substituents.

As used herein, the term " aryl group " means a monovalent residue derived from a compound or derivative thereof, including a structure containing benzene or a structure in which two or more benzenes are condensed or bonded, unless otherwise specified have. The aryl group may be, for example, an aryl group having 6 to 22 carbon atoms, preferably 6 to 16 carbon atoms, and more preferably 6 to 13 carbon atoms, and examples thereof include a phenyl group, a phenylethyl group, a phenylpropyl group, , A tolyl group, a xylyl group or a naphthyl group.

In the present application, the polymer may have a weight average molecular weight (MW) such that the pressure-sensitive adhesive composition can be formed into a film. For example, the polymer may have a weight average molecular weight of about 100,000 to 2,000,000, 300,000 to 1,500,000, or 500,000 to 1,200,000. The term "weight average molecular weight" as used herein means a value converted to a standard polystyrene measured by GPC (Gel Permeation Chromatograph).

In one example, the adhesive composition may further comprise an inorganic filler. The inorganic filler can form a concave-convex structure when the pressure-sensitive adhesive composition is made of a pressure-sensitive adhesive layer in the form of a film or a sheet. The inorganic filler may have a particle diameter of 100 nm to 1 占 퐉, 200 nm to 800 nm, or 300 nm to 700 nm from the viewpoint of forming a concave-convex structure. In one example, the material of the inorganic filler is not particularly limited as long as it is not reactive with the material constituting the pressure-sensitive adhesive, and may include, for example, silica or titania. The pressure-sensitive adhesive layer comprising the pressure-sensitive adhesive composition according to the present application can be attached to the electrolyte membrane described later on the surface on which the concavo-convex structure is formed. The present application can provide a high adhesive strength and durability after the final laminating step while lowering the initial adhesive force by including the inorganic filler in the pressure-sensitive adhesive composition.

In the embodiment of the present application, the inorganic filler may be included in an amount of 5 to 30 parts by weight or 8 to 25 parts by weight based on 100 parts by weight of the polymer. In the present application, the content of the inorganic filler is controlled to not less than 5 parts by weight to form a desired concavo-convex structure, and by controlling the content to 30 parts by weight or less, it is possible to prevent the inorganic filler from being clumped, And excellent adhesion and durability can be realized at the time of final jointing.

The pressure-sensitive adhesive composition may contain various additives in addition to the above-described composition according to the application and the manufacturing process of the sub-gasket film described later. For example, the pressure-sensitive adhesive composition may contain a curable material, a cross-linking agent, a filler or the like in an appropriate range depending on the desired properties.

The present application also relates to a sub gasket film for a fuel cell. The sub gasket film (1) may include a pressure-sensitive adhesive layer (2) comprising the above-mentioned pressure-sensitive adhesive composition. The sub gasket film may include a base layer 3 and a pressure-sensitive adhesive layer 2 formed on at least one side of the base layer 3 and including the above-mentioned pressure-sensitive adhesive composition, as shown in Fig. Further, in one example, the sub gasket film may include the pressure-sensitive adhesive layer on both sides of the base layer, and as another example, a film composed of a pressure-sensitive adhesive layer without a base layer may be provided.

The material of the base layer is not particularly limited and may be, for example, a polyethylene naphthalate film, a polyethylene terephthalate film, a polytetrafluoroethylene film, a polyethylene film, a polypropylene film, a polybutene film, a polybutadiene film, Film, a polyurethane film, an ethylene-vinyl acetate film, an ethylene-propylene copolymer film, an ethylene-ethyl acrylate copolymer film, an ethylene-methyl acrylate copolymer film or a polyimide film. In consideration of physical durability, chemical stability and oxygen barrier property, the present application can use a polyethylene naphthalate film as a substrate layer.

In one example, the thickness of the pressure-sensitive adhesive layer may be in the range of 1 占 퐉 to 50 占 퐉, 2 占 퐉 to 40 占 퐉, 3 占 퐉 to 30 占 퐉, 5 占 퐉 to 20 占 퐉, or 8 占 퐉 to 15 占 퐉. By controlling the thickness of the pressure-sensitive adhesive layer in the above-described range, the present application can provide excellent re-workability and can prevent defects such as bubbling at the time of lamination.

In the specific embodiment of the present invention, the pressure-sensitive adhesive layer may have a probe tack force measured at room temperature of 50 gf or less, 40 gf or less, 30 gf or less, 20 gf or less, 10 gf or less, 9 gf or 8 gf or less as measured according to ASTM D2979 . The probe tack force can be measured by a method known in the art. For example, a glass having a size of 3 cm x 3 cm was prepared, and then the pressure-sensitive adhesive layer was attached using a roll laminator, and then the pressure-sensitive adhesive surface was measured at room temperature based on the ASTM D2979 method. Probe tack measurement equipment was used to measure the average value three times under conditions of contact time of 10 seconds and application rate of 100 gf at a rate of 10 mm / sec using a 3-cm diameter rod-type probe. By controlling the probe tack force of the pressure-sensitive adhesive layer to 10 gf or less, the present invention can provide excellent initial reworkability and effectively inhibit the bubbling of the bubbles or the adhesive surface.

The present application also relates to membrane electrode assemblies. The membrane electrode assembly may include an electrolyte membrane 4 and a sub gasket film 1 formed on one or both sides of the electrolyte membrane 4, as shown in FIG. 2 or 3. The sub gasket film may include a pressure-sensitive adhesive layer having the pressure-sensitive adhesive composition described above.

The membrane electrode assembly of the present application may further include an electrode layer 5 on one side or both sides of the electrolyte membrane 4 except for the edge portion where the subgasket film 1 is formed. The edge of the electrode layer 5 may be connected to the sub-gasket film 1.

The thickness or width of the rim in the present application can be adjusted by a person skilled in the art according to his purpose, which is well known to a person skilled in the art.

The electrode layer may be an anode electrode layer or a cathode electrode layer. The electrode layer may be a catalytically active portion. In one example, an exemplary fuel cell stack of the present application may include the membrane electrode assembly described above. Specifically, the fuel cell stack includes a membrane-electrode assembly having a first catalytically active portion and a second catalytically active portion formed on both sides of the electrolyte membrane, and a first flow path for flowing the fuel, An anode member disposed in close contact with the first catalyst active portion, and a cathode member having a second flow path for circulating air and disposed in close contact with the second catalyst active portion. In the above, the first catalytically active portion may be an anode electrode layer and the second catalytically active portion may be a cathode electrode layer.

And the first flow path may be formed in a channel shape of a meander in the anode member. Further, the second flow path may be formed as a plurality of vent holes in the cathode member. Further, the fuel cell stack including the above-described membrane electrode assembly may be configured as a current collecting plate for collecting electric current of different polarity from the anode member and the cathode member.

In one example, the membrane electrode assembly may further include a gasket formed on the sub-gasket film along the rim of the electrolyte membrane. The material of the gasket is not particularly limited and may be a silicone, a fluorine or an olefin rubber material, a polyethylene terephthalate, a polyethylene naphthalate, a polyimide or a polypropylene. . The gasket may be formed to cover the entire sub-gasket film or may cover a part of the sub-gasket film. When covering a part, the gas diffusion layer described later may be formed so as to cover another part.

In one example, the gaskets 7 may be connected to the edge of the electrode layer as shown in FIG. 3, or may not be connected to each other as shown in FIG. For example, when the sub gasket film is formed to have the same thickness as the electrode layer or is formed to have a thicker thickness, the gasket formed on the sub gasket film may not be connected to the edge of the electrode layer. However, when the sub gasket film is formed to be thinner than the electrode layer, the gasket may be connected to the edge of the electrode layer.

In one example, the subgasket film may further comprise a base layer, and a pressure-sensitive adhesive layer may be formed on one or both sides of the base layer, the pressure sensitive adhesive composition including the pressure-sensitive adhesive composition.

The present application also relates to a fuel cell stack. In one example, the fuel cell stack of the present application includes a gas diffusion layer 6 formed on one side or both sides of the above-described membrane electrode assembly and the membrane electrode assembly as shown in FIG. 4 . The gas diffusion layer 6 may be formed on the electrode layer 5 of the membrane electrode assembly or a part of the subgasket film 1 existing at the rim of the membrane electrode assembly And can be formed thereon in an overlapping manner.

In one example, the edge of the gas diffusion layer may or may not be connected to the edge of the gasket formed on the sub-gasket film.

In one example, as shown in FIG. 5, the rim portion of the gas diffusion layer 6 may be formed so as to overlap with one region of the sub gasket film 1. For example, when the thickness of the sub-gasket film 1 is the same as that of the electrode layer 5, the gasket 7 does not completely cover the sub-gasket film 1, It may be formed thereon so as to cover a region on the outer surface (outward from the electrolyte membrane side) of the sub gasket film 1. In another example, when the thickness of the sub gasket film 1 is thicker than the thickness of the electrode layer 5, the gas diffusion layer 6 is formed on the electrode layer 5, Side surface) and / or the gas diffusion layer 6 on the outer surface of the sub-gasket film 1.

In one example, the edge portion of the gas diffusion layer and one region of the sub gasket film may be adhered to each other by an adhesive in a region where the gas diffusion layer and the sub gasket film overlap each other, that is, in the region in contact therewith.

The present application also relates to a method of manufacturing a fuel cell stack. The manufacturing method may include a step of laminating a gas diffusion layer on an electrode layer formed on one surface or both surfaces of an electrolyte membrane, and bonding a part of the sub gasket film overlapping with the stacked gas diffusion layer through an adhesive means.

In one example, the manufacturing method includes: forming an electrode layer on both sides of an electrolyte membrane except for a rim; Forming a subgasket film on the edges of both sides of the electrolyte membrane so as to be connected to the edge of the electrode layer; And bonding the gas diffusion layer on the electrode layer and a part of the sub gasket film overlapping with the gas diffusion layer to be laminated through the bonding means. The adhesive means is not particularly limited, and adhesives known in the art can be used.

For example, the adhesive may be selected from the group consisting of i) cellulose acetate, cellulose acetate butyrate, cellulose nitrate, polyvinyl acetate, vinylvinylidene (Thermoplastic Adhesive) in which a solvent-type adhesive selected from polyvinyl acetates, polyvinyl alcohols, polyamides, acrylics and phenoxy is controlled in viscosity, (Ii) an epoxy resin such as Cyanoacrylate, Polyester, Urea Formaldehyde, Resorcinol and Phenol-Resorcinol Formaldehyde, Epoxy, A solvent or a liquid type adhesive selected from among polyimide, acrylic, and acrylate acid diesters, Thermosetting Adhesive, or iii) Natural Rubber, Reclaimed Rubber, Butyl Synthetic Rubber, Polyisobutylene, Nitrile, Styrene Butadiene, And an elastomeric adhesive which is viscosity-regulated in a liquid type adhesive selected from styrene butadiene, polyurethane, polysulfide, silicone, and neoprene.

The present application provides a pressure-sensitive adhesive composition which is excellent in reworkability, has no defects such as bubble formation at the time of laminating, and exhibits excellent adhesion and durability after the final laminating process, and a sub gasket film for a fuel cell comprising the same.

1 is a sectional view of a sub gasket film for a fuel cell according to one example of the present application.
Figures 2 and 3 show cross-sectional views of a membrane electrode assembly (conjugate) according to one example of the present application.
Figures 4 and 5 show cross-sectional views of a fuel cell stack according to one example of the present application.

Hereinafter, the present application will be described in more detail by way of examples according to the present application and comparative examples not complying with the present application, but the scope of the present application is not limited by the following embodiments.

Example  One

A 1 L reactor was charged with vinyl acetate and isobornyl acrylate in a weight ratio of 85:15 (VAc: IBOA). Subsequently, ethyl acetate (EAc) was added as a solvent, nitrogen gas was purged for 60 minutes to remove oxygen, and then azobisisobutyronitrile (AIBN ) Was added in an amount of 0.02 parts by weight based on 100 parts by weight of the solid content to initiate the reaction. Thereafter, the reaction product which had been reacted for about 5 hours was diluted with ethyl acetate (EAc) to prepare a sticky polymer (A1).

The prepared pressure sensitive adhesive polymer solution was coated on a polyethylene naphthalate (PEN) base layer having a thickness of 25 탆 by a pressure sensitive adhesive layer having a thickness of 10 탆 in a bar coating manner and dried to prepare a sub gasket film.

The prepared subgasket film was joined to the rim of the fluorine electrolyte membrane formed on both sides of the electrode layer, and pressed and bonded at 140 DEG C for 2 minutes to prepare a membrane electrode assembly.

Example  2

A subgasket film and a membrane electrode assembly were prepared in the same manner as in Example 1, except that vinyl acetate and isobornyl acrylate were added in a weight ratio (VAc: IBOA) of 95: 5.

Comparative Example  One

A subgasket film and a membrane electrode assembly were prepared in the same manner as in Example 1, except that isobornyl acrylate was not added.

Comparative Example  2

A subgasket film and a membrane electrode assembly were prepared in the same manner as in Example 1, except that ethylhexyl acrylate and isobornyl acrylate were added in a weight ratio of 85:15 (2-EHA: IBOA).

The physical properties in the following examples and comparative examples were evaluated in the following manner.

1. Molecular weight measurement

The weight average molecular weight (Mw) was measured using GPC under the following conditions, and the measurement results were converted using standard polystyrene of Agilent system for the calibration curve.

<Measurement Conditions>

Measuring instrument: Agilent GPC (Agilent 1200 series, U.S.)

Column: Two PL Mixed B connections

Column temperature: 40 ° C

Eluent: THF (Tetrahydrofuran)

Flow rate: 1.0 mL / min

Concentration: ~ 1 mg / mL (100 μL injection)

2. Room Temperature Tack Measurement

After the glass having a size of 3 cm x 3 cm was prepared, the pressure-sensitive adhesive layer prepared in Examples and Comparative Examples was attached using a roll laminator, and the pressure-sensitive adhesive surface was measured at room temperature based on the ASTM D2979 method. Probe tack measurement equipment was used to measure the average value three times under conditions of contact time of 10 seconds and application rate of 100 gf at a rate of 10 mm / sec using a 3-cm diameter rod-type probe.

3. Final Lyo  After appearance

When the membrane electrode assemblies prepared in the examples and comparative examples were subjected to final pressing and laminating, the cells were observed with a visual inspection per a 10 cm × 10 cm area. When the cells were observed with no more than 3 cells, Were classified as X.

4. Final Lyo Peel force

When the base layer and the electrolyte membrane were fixed (width 1 inch, length 120 mm) and the base layer was torn off at a rate of 0.3 mpm using a TA analyzer, peeling was indicated as not possible.

Molecular Weight Tack (gf) Appearance after final lamination Final peel strength Example 1 116 million 7.6 O No peeling Example 2 99 million 12.6 △ No peeling Comparative Example 1 65 million 53 X No peeling Comparative Example 2 70 million 100 or more X No peeling

In the case of Comparative Example 2, wrinkles due to inflow of air bubbles were observed in appearance after final laminating.

1: Sub gasket film
2: Pressure-sensitive adhesive layer
3: substrate layer
4: electrolyte membrane
5: Electrode layer
6: gas diffusion layer
7: Gasket

Claims (21)

A polymer having a first polymerization unit derived from a monomer having a glass transition temperature of 0 ° C or higher and a second polymerization unit derived from a monomer represented by the following formula (1):
[Chemical Formula 1]

Wherein R ₁ is an alkyl group, an alkenyl group, an alkynyl group, an alkoxy group or an aryl group, R ₂ is a polymerizable functional group, and X is oxygen or nitrogen. The pressure-sensitive adhesive composition according to claim 1, wherein the second polymerization unit and the first polymerization unit are contained in a ratio of 50 to 90 parts by weight and 10 to 40 parts by weight, respectively. The thermoplastic resin composition according to claim 1, wherein the monomer having a glass transition temperature of 0 ° C or higher is at least one selected from the group consisting of methyl (meth) acrylate, t-butyl (meth) acrylate, isobornyl acrylate, cyclohexyl (meth) acrylate, styrene, Isopropyl methacrylate, N-vinyl formamide, benzyl acrylate, or mixtures thereof. The pressure-sensitive adhesive composition according to claim 1, wherein the monomer having a glass transition temperature of 0 ° C or higher comprises a compound represented by the following formula (2):
(2)

In Formula 2, R is hydrogen or an alkyl group, and P is an aliphatic cyclic monovalent residue having 3 to 30 carbon atoms. The pressure-sensitive adhesive composition according to claim 1, wherein the polymerizable functional group comprises an alkenyl group, an acryloyl group, a methacryloyl group, an acryloyloxy group or a methacryloyloxy group. The pressure-sensitive adhesive composition according to claim 1, wherein the monomer having a glass transition temperature of 0 ° C or higher or the monomer of the formula (1) does not contain a reactive functional group. The pressure-sensitive adhesive composition according to claim 1, wherein the polymer has a weight average molecular weight in the range of 100,000 to 2,000,000. A sub-gasket film for a fuel cell comprising a base layer and a pressure-sensitive adhesive layer formed on at least one side of the base layer and comprising the pressure-sensitive adhesive composition according to any one of claims 1 to 7. 9. The method of claim 8, wherein the substrate layer is at least one selected from the group consisting of a polyethylene naphthalate film, a polyethylene terephthalate film, a polytetrafluoroethylene film, a polyethylene film, a polypropylene film, a polybutene film, a polybutadiene film, a polyvinyl chloride film, A sub gasket film for a fuel cell comprising an ethylene-vinyl acetate film, an ethylene-propylene copolymer film, an ethylene-ethyl acrylate copolymer film, an ethylene-methyl acrylate copolymer film or a polyimide film. The sub-gasket film for a fuel cell according to claim 8, wherein the pressure-sensitive adhesive layer has a probe tack force measured according to ASTM D2979 standard of 50 gf or less at room temperature. An electrolyte membrane; A sub gasket film formed on one or both sides of the electrolyte membrane and comprising the pressure-sensitive adhesive composition according to any one of claims 1 to 7; And an electrode layer formed on one surface or both surfaces of the electrolyte membrane except for the edge portion where the sub gasket film is formed, and the edge of the electrode layer is connected to the sub gasket film. 12. The membrane electrode assembly of claim 11, wherein the electrode layer is an anode electrode layer or a cathode electrode layer. 12. The membrane electrode assembly of claim 11, wherein the electrode layer is a catalytically active portion. 12. The membrane electrode assembly of claim 11, further comprising a gasket formed on the subgasket film along the rim of the electrolyte membrane. 15. The membrane electrode assembly of claim 14, wherein the gasket is not connected to or connected to the edge of the electrode layer. 12. The membrane electrode assembly of claim 11, wherein the subgasket film comprises a substrate layer, and a pressure-sensitive adhesive layer is formed on one or both sides of the substrate layer. 17. A fuel cell stack comprising a membrane electrode assembly according to any one of claims 11 to 16 and a gas diffusion layer formed on one or both sides of the membrane electrode assembly. The fuel cell stack according to claim 17, wherein the edge of the gas diffusion layer is not connected to or connected to the edge of the gasket formed on the sub gasket film. 18. The fuel cell stack according to claim 17, wherein a rim portion of the gas diffusion layer is formed to overlap with one region of the sub gasket film. 20. The fuel cell stack according to claim 19, wherein the rim portion of the gas diffusion layer and one region of the sub gasket film are adhered by an adhesive in the overlapped region. Forming an electrode layer on both sides of the electrolyte membrane except for the rim portion;
Forming a subgasket film according to claim 8 so as to be connected to edge portions of the electrode layer formed on both sides of the electrolyte membrane; And
A step of laminating a gas diffusion layer on the electrode layer and bonding a part of the sub gasket film overlapping with the stacked gas diffusion layer through an adhesive means.

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