Abstract: An MEA 15 is arranged between frames 13, 14. A first gas flow passage forming member 21 is arranged between an anode electrode layer 17 of the MEA 15 and a first separator 23 fixed to an upper surface of the frame 13. A second gas flow passage forming member 22 is arranged between a cathode electrode layer 18 of the MEA 15 and a second separator 24 fixed to a lower surface of the frame 14. The gas flow passage forming members 21, 22 are each formed by a metal lath 25. The metal lath is formed by forming a plurality of through holes 26 in a thin metal plate in a mesh-like manner and forming the thin metal plate in a stepped shape. The gas flow passage forming members 21, 22 each include a plurality of annular portions 27 forming the through holes 26. Each of the annular portions 27 has a flat surface portion 28a in a first contact portion 28, which contacts a carbon paper 19, 20.

Abstract: A fuel cell has: an electrolyte; an anode provided on one side of the electrolyte and having a fuel-gas consuming face at which fuel gas is consumed; a cathode provided on the other side of the electrolyte and having an oxidizing-gas consuming face at which oxidizing gas is consumed; and a fuel-gas passage portion forming a passage through which fuel gas is supplied to predetermined regions of the fuel-gas consuming face of the anode. The fuel cell has an operation mode in which almost the entire amount of the supplied fuel gas is consumed at the fuel-gas consuming face of the anode.

Abstract: A radiation-curable resin composition for optical parts comprising (A) 5% to 70% by weight of a urethane (meth)acrylate which is a reaction product of (a) a (meth)acrylate having a hydroxyl group, (b) a polyisocyanate having an aromatic ring, (c) a polyol, and (d) an alcohol having 1 to 4 carbon atoms without a polymerizable unsaturated group, and which has (meth)acryloyl groups in an amount of 40% to 85% by mole of its molecular ends on average of the reaction product; and (B) 10% to 80% by weight of a compound, other than the component (A), having an ethylenically unsaturated group is provided. A cured product of the composition exhibits a high refractive index, excellent property of adhesion to various plastic substrates, appropriate hardness, and little sign of yellowing.

Abstract: Ribs (41a, 43a) are formed on a cathode plate (41) and an anode plate (43) of a fuel cell (10). The ribs (41a, 43a) protrude toward a contact surface of porous members (26, 27), and provided along an outer periphery of the porous members (26, 27) to surround the outer periphery of the porous members (26, 27). The rib (41a) of the cathode plate (41) and the rib (43a) of the anode plate (43) are arranged to face each other when separator (40) and the porous members (26, 27) are stacked on both sides of a power generating portion (20). The power generating portion (20), the porous members (26, 27), and the separator (40) are stacked such that a seal gasket (30) on the power generating portion (20) is partially sandwiched between the ribs (41a, 43a).

Abstract: Subject: To provide a photocurable composition capable of producing a cured product excelling in heat resistance, showing only a small amount of deformation, and producing cured products particularly useful as optical parts. Means for the Solution: A photocurable composition comprising the following components (A)-(D): (A) at least one of the (meth)acrylates having the structures shown by the formulas (1) and (2) (excluding the following component (C)), Chemical Formula (1), Chemical Formula (2) wherein R1 represents a hydrogen atom or a halogen atom excluding a fluorine atom, R2 is a hydrogen atom, a halogen atom excluding a fluorine atom, Ph-C(CH3)2—, Ph-, or an alkyl group having 1-20 carbon atoms, and R3 represents —CH2—, —S—, or —C(CH3)2—, (B) a (meth)acrylate having three or more functional groups, (C) a monofunctional monomer of which the homopolymer has a Tg of 150° C.

Abstract: To provide a UV-curable resin composition useful for forming optical parts such as optical lenses. A radiation-curable resin composition for optical parts, comprising (A) 5–70 wt % of urethane (meth)acrylate, (B) 0.1–70 wt % of benzyl (meth)acrylate, and (C) 10–70 wt % of an ethylenically unsaturated group-containing compound other than the components (A) and (B).

Abstract: The invention relates to a photocurable resin composition comprising: (A) (A1) a (meth)acrylate having a structure shown by the formula (1) or (2), or (A2) an epoxy compound having a structure shown by the formula (1) or (2); (B) a (meth)acrylate having three or more functional groups other than (A1); (C) a radical photoinitiator; (D) a compound having three or more cyclic ether linkages in the molecule other than (A2) and (E) a cationic photoinitiator; the invention also relates to optical parts made from the resins of the invention and use of the resin in other applications.

Abstract: To provide a UV-curable resin composition useful for forming optical parts such as optical lenses. A radiation-curable resin composition for optical parts, comprising (A) 5-70 wt % of urethane (meth)acrylate, (B) 0.1-70 wt % of benzyl (meth)acrylate, and (C) 10-70 wt % of an ethylenically unsaturated group-containing compound other than the components (A) and (B).

Abstract: An object of the present invention is to provide cationic hollow crosslinked polymer particles that maintain a cationic property over a wide pH range, has adequate strength, and is favorable for use in filled paper, pigments for coating paper, additives for paints, fillers for resins, rubbers, and the like. Another object of the present invention is to provide a method of producing the abovementioned cationic hollow crosslinked polymer particles with excellent characteristics in a stable manner. The hollow crosslinked polymer particles of the present invention are characterized in that (I) the zeta potential as measured in an aqueous medium of pH 2 to 9 is in the range of +5 to +100 mV, (II) the volume hollowness is in the range of 1 to 80%, and (III) the average particle diameter is in the range of 0.03 to 10 &mgr;m. This hollow crosslinked polymer particles are produced by a method that (a) 1 to 99.99 weight % of a crosslinking monomer, (b) 0.

Abstract: An object of the present invention is to provide cationic hollow crosslinked polymer particles that maintain a cationic property over a wide pH range, has adequate strength, and is favorable for use in filled paper, pigments for coating paper, additives for paints, fillers for resins, rubbers, and the like. Another object of the present invention is to provide a method of producing the abovementioned cationic hollow crosslinked polymer particles with excellent characteristics in a stable manner. The hollow crosslinked polymer particles of the present invention are characterized in that (I) the zeta potential as measured in an aqueous medium of pH 2 to 9 is in the range of +5 to +100 mV, (II) the volume hollowness is in the range of 1 to 80%, and (III) the average particle diameter is in the range of 0.03 to 10 &mgr;m. This hollow crosslinked polymer particles are produced by a method that (a) 1 to 99.99 weight % of a crosslinking monomer, (b) 0.