Abstract: A solid polymer electrolyte membrane is used to stably generate electricity under non-humidified conditions or conditions with a relative humidity of 50% or less at an operating temperature of 100° C. to 300° C. for a long period of time. A method of producing the same and a fuel cell including the solid polymer electrolyte membrane are also provided. The solid polymer electrolyte membrane comprises a component A comprising at least a basic polymer such as polybenzimidazoles, polybenzoxazoles, and polybenzthiazoles, a component B comprising at least a basic polymer such as a porous polyolefin resin grafted by a vinyl monomer, a porous fluorinated polyolefin resin grafted by a vinyl monomer, and a porous polyimide resin grafted by a vinyl monomer, and a component C comprising at least an inorganic acid such as a sulfuric acid, a phosphoric acid, and a condensed phosphoric acid.

Abstract: An adhesive film comprising a ceramic powder and an adhesive composition having pressure-sensitive properties at room temperature (20.degree. C.), and a process for producing a multilayered ceramic structure, such as multilayered ceramic substrates, laminated ceramic capacitors, etc. using the adhesive film, are disclosed.

Abstract: A glass powder adhesive sheet used for a surface coating of inorganic structures comprising ceramics, metals, glasses, etc., a glazed ceramic substrate such as a substrate of electronic circuit, etc. or a heat-resistant label, etc., which comprises a glass powder molding comprising as main components, a glass powder and a resin binder, and an adhesive layer having a thermal decomposition initiation temperature higher than that of the resin binder, provided on the surface of the glass powder molding.