A membrane electrode assembly includes a cathode, an anode, a proton-conductive membrane arranged between the cathode and the anode and a sealing frame which surrounds the cathode, the anode and the membrane at the edges thereof, wherein in the inner region of the sealing frame at least mutually superposed subregions of the cathode, of the anode and of the membrane are exposed, wherein the sealing frame in the layer thickness direction comprises a first sealing layer and a second sealing layer which are bonded to each other by an adhesive and wherein the first sealing layer and/or the second sealing layer has a reinforcement structure.

A membrane electrode assembly includes a cathode, an anode, a proton-conductive membrane arranged between the cathode and the anode and a sealing frame which surrounds the cathode, the anode and the membrane at the edges thereof, wherein in the inner region of the sealing frame at least mutually superposed subregions of the cathode, of the anode and of the membrane are exposed, wherein the sealing frame in the layer thickness direction comprises a first sealing layer and a second sealing layer which are bonded to each other by an adhesive and wherein the first sealing layer and/or the second sealing layer has a reinforcement structure.

The present invention was made in view of the foregoing problem and has an object to provide a photocurable resin composition which can be quickly cured by irradiation with active energy rays such as ultraviolet rays and achieves excellent adhesion to polyolefin such as PP having properties difficult to bond. Specifically, provided is a photocurable resin composition containing the following (A) and (B) ingredients: (A) ingredient: a polymer having a polyisobutylene backbone mainly containing a —[CH.sub.2C(CH.sub.3).sub.2]— unit, the polymer having one or more (meth)acryloyl groups per molecule; and (B) ingredient: a photo-radical initiator of hydrogen abstraction type.

The present invention was made in view of the foregoing problem and has an object to provide a photocurable resin composition which can be quickly cured by irradiation with active energy rays such as ultraviolet rays and achieves excellent adhesion to polyolefin such as PP having properties difficult to bond. Specifically, provided is a photocurable resin composition containing the following (A) and (B) ingredients: (A) ingredient: a polymer having a polyisobutylene backbone mainly containing a —[CH.sub.2C(CH.sub.3).sub.2]— unit, the polymer having one or more (meth)acryloyl groups per molecule; and (B) ingredient: a photo-radical initiator of hydrogen abstraction type.

This invention relates to gaskets, apparatus incorporating said gaskets and to methods of using them. In particular, there is provided a gasket comprising a closed loop of resilient material, the loop having an inner periphery and an outer periphery, the gasket having a first thickness at a first position which is between 0% and 30% of the gasket width away from the outer periphery, a second thickness at a second position measured at a point at least 50% of the gasket width from the first position, and a third thickness at a third position intermediate the first and second positions and at least 10% of the gasket width from each, the first thickness being greater than the third thickness which is greater than the second thickness, and wherein either a said gasket reduces in thickness from the first thickness to the third thickness and then to the second thickness via one or more tapered sections which taper linearly to a reduced thickness in the direction towards the inner periphery, or b said gasket reduces in thickness from the first thickness to the third thickness via one or more steps which step to a reduced thickness in the direction towards the inner periphery and then from the third thickness to the second thickness via one or more steps which step to a reduced thickness in the direction towards the inner periphery, or c said gasket reduces in thickness from the first thickness to the third thickness and then to the second thickness via a combination of one or more steps and one or more tapered sections as defined above.

The invention relates to a fuel cell (10) having a stack comprising a bipolar plate (20) which has a flow field (22) formed by a profiled section of the bipolar plate (20), and an elongated sealing element (21) which at least partially surrounds the flow field (22), and a membrane electrode assembly (30). It is provided that, inside a cavity (25) formed between the membrane electrode assembly (30) and the bipolar plate (20) in a region between the sealing element (21) and the flow field (22), a filling agent (24) is arranged which extends in the extension direction of the cavity (25).

The invention relates to a fuel cell (10) having a stack comprising a bipolar plate (20) which has a flow field (22) formed by a profiled section of the bipolar plate (20), and an elongated sealing element (21) which at least partially surrounds the flow field (22), and a membrane electrode assembly (30). It is provided that, inside a cavity (25) formed between the membrane electrode assembly (30) and the bipolar plate (20) in a region between the sealing element (21) and the flow field (22), a filling agent (24) is arranged which extends in the extension direction of the cavity (25).

A fuel cell is provided with a power generation unit; the power generation unit is provided with a first metal separator, a first electrolyte membrane/electrode structure, a second metal separator, a second electrolyte membrane/electrode structure, and a third metal separator. The first electrolyte membrane/electrode structure is provided with a first resin frame member at the outer periphery, and the first resin frame member is provided with an inlet buffer section positioned outside a power generation region and coupled to a first oxidant gas flow path, and a protruding section, which is one part of an inlet coupling flow path coupling together the inlet buffer section and an oxidant gas inlet communication hole.

A fuel cell is provided with a power generation unit; the power generation unit is provided with a first metal separator, a first electrolyte membrane/electrode structure, a second metal separator, a second electrolyte membrane/electrode structure, and a third metal separator. The first electrolyte membrane/electrode structure is provided with a first resin frame member at the outer periphery, and the first resin frame member is provided with an inlet buffer section positioned outside a power generation region and coupled to a first oxidant gas flow path, and a protruding section, which is one part of an inlet coupling flow path coupling together the inlet buffer section and an oxidant gas inlet communication hole.

The present invention relates to the field of fuel cell stacks and stack tower or module, in particular to a sealing structure for stack tower and a stack tower. The sealing structure comprises a first component, a second component and a mica spacer, the first component and the second component are opposite to each other, the mica spacer is disposed between the first component and the second component, sealing part is arranged between the mica spacer and at least one of the first component and the second component, and the sealing part comprises a glass ceramic layer and an outer circumferential ceramic cement ring surrounding the glass cement layer; the sealing structure for stack tower has excellent sealing performance and service durability for a fuel cell system.