Abstract: A polymer electrolyte membrane for a polymer electrolyte fuel cell, that overcomes disadvantages of the conventional polymer ion-exchange membranes including fluorine-based polymer electrolyte membranes and can maintain cell characteristics even in use over a long period of time (e.g., several thousand hours). The polymer electrolyte membrane comprises a fluorine polymer substrate having grafted thereon monomers having sulfone groups as a cation-exchange group, wherein a main chain of the graft chain comprises a hydrocarbon or a partially fluorinated hydrocarbon, and sulfone groups or substituents having sulfone groups are bonded as a side chain, and wherein in element compositional ratio by ESCA, at least one surface of the polymer electrolyte membrane has O/S value of 5.0 or higher, and a surface element proportion of S is 0.4-5.0%.

Abstract: The present invention provides an electrolyte membrane that can maintain its properties even during long-term use in a solid polymer fuel cell. More specifically, the present invention provides an electrolyte membrane that exhibits excellent adhesion to the electrodes in a solid polymer fuel cell. The electrolyte membrane of the present invention is an electrolyte membrane for a solid polymer fuel cell, in which a graft chain containing a cation-exchange group has been added to a polymer substrate comprising an olefin-type polymer or fluoropolymer, wherein the penetration temperature of the electrolyte membrane, as measured by thermomechanical analysis, is no more than 200° C. This electrolyte membrane preferably has a dimensional variation ratio, upon immersion in a 40 weight % aqueous methanol solution, of no more than 40%. The polymer substrate preferably comprises polyvinylidene fluoride.

Abstract: By performing photograft polymerization of functional monomers such that grafted chains will be introduced from the surface of a polymer base film into its interior without deteriorating its inherent characteristics and also by creating a multiplex crosslinked structure between the grafted chains and the base film under such conditions as to cause preferential radiation-induced crosslinking reaction, there is produced a polymer electrolyte membrane having high enough oxidation resistance and proton conductivity to be suitable for use in fuel cells.

Abstract: A crosslinked nano-inorganic particle/polymer electrolyte membrane composed of a polymer film substrate, graft molecular chains bound to the backbone skeleton of the polymer film substrate and comprising a vinyl monomer graft-polymerized, sulfonic groups bound to the graft molecular chains, and an inorganic material as nano-scale particles uniformly dispersed within a crosslinked structure ascribed to the backbone skeleton of the polymer film substrate and the graft molecular chains, wherein the backbone skeleton of the polymer film substrate, the graft molecular chains, and the nano-inorganic particles mutually construct a crosslinked structure.

Abstract: Polytetrafluoroethylene porous film is laminated with an ultra high molecular weight polyolefin porous film to realize excellent formability, dust collecting ability, and permeability that could not be attained by these porous films used alone. The laminate, which can be formed to prescribed shape if desired, is used to make a container for holding an adsorbent.

Abstract: A polymer electrolyte membrane produced by a process in which a monofunctional vinyl monomer into which sulfonic acid groups can be introduced and a vinyl monomer having a halogen at a terminal are co-grafted into a polymer base film that has been exposed to an ionizing radiation, and the base film is exposed again to an ionizing radiation and/or heat treated so that the terminal halogen is eliminated to introduce a crosslinking structure in which the graft molecular chains are bound together.

Abstract: Polymer ion-exchange membranes having outstanding electrical conductivity, water retention and oxidation resistance are produced by the steps of uniformly mixing an organic high-molecular weight resin with functional inorganics having the abilities to promote graft polymerization of polymerizable monomers, adsorb water and conduct protons, irradiating the resulting functional inorganics/polymer membrane to initiate graft polymerization or graft copolymerization of polymerizable monomers having functional groups, and then introducing sulfonic acid groups into the graft chains.

Abstract: The improved electrolyte membrane which is produced by grafting a styrenic monomer and bis(vinylphenyl)ethane as monomers to a polymer substrate and then introducing sulfonic acid groups into the graft side chains formed has improved oxidation resistance and good adhesion to electrodes. The polymer substrate is preferably made of a fluorocarbon polymer or an olefinic polymer. The styrenic monomer is preferably one or more species selected from the group consisting of styrene, ?-methylstyrene, vinyltoluene, and trifluorostyrene.

Abstract: A polymer electrolyte membrane for a polymer electrolyte fuel cell, that overcomes disadvantages of the conventional polymer ion-exchange membranes including fluorine-based polymer electrolyte membranes and can maintain cell characteristics even in use over a long period of time (e.g., several thousand hours). The polymer electrolyte membrane comprises a fluorine polymer substrate having grafted thereon monomers having sulfone groups as a cation-exchange group, wherein a main chain of the graft chain comprises a hydrocarbon or a partially fluorinated hydrocarbon, and sulfone groups or substituents having sulfone groups are bonded as a side chain, and wherein in element compositional ratio by ESCA, at least one surface of the polymer electrolyte membrane has O/S value of 5.0 or higher, and a surface element proportion of S is 0.4-5.0%.

Abstract: A colored resin composition for water pipes which comprises (A) a polyethylene resin and (B) specific amounts of (i) a cobalt blue pigment, (ii) at least one selected from phthalocyanine pigments having no metals and metal phthalocyanine pigments having no chlorine atoms or one chlorine atom in a molecule, (iii) a dioxazine pigment and (iv) a titanium dioxide pigment and a colored water pipe which comprises the colored polyethylene resin composition and has a color tone within a specific color solid expressed by the values of the Munsell standard color table before and after the test of resistance to chlorine water for 500 hours. The composition and the water pipe are colored in a bluish color and exhibits an excellent hiding property, excellent fastness of the color tone of the coloring component to water containing chlorine and an excellent property for preventing formation of blisters in water containing chlorine.

Abstract: A filter medium for filters wherein the evolution of organic gases and dusting from a reinforcing member are depressed and thus the excellent characteristics inherent to a porous polytetrafluoroethylene membrane as a collection layer are fully achieved. The filter medium (1) for filters comprises a porous polytetrafluoroethylene membrane (2) and a porous ultrahigh-molecular weight polyolefin membrane (3) as a reinforcing member for the filter medium.

Abstract: A propylene polymer composition comprising (A) a modified propylene polymer obtained by treating: (1) 100 parts by weight of a propylene polymer or a mixture of a propylene homopolymer and a ethylene-propylene copolymer rubber, with (2) 0.1 to 50 parts by weight of an organic compound having at least one unsaturated bond in the molecule and a hydroxyl group and (3) 0.01 to 20 parts by weight of an organic peroxide; and (B) a propylene polymer, wherein content of the component (A) in the composition is 5 to 50% by weight. This composition may further contain one or more of (C) an amorphous ethylene-propylene copolymer having a propylene content of 20% to 50% by weight and a Mooney viscosity ML.sub.1+4 at 100.degree. C. of 20 to 100, (D) a high-density ethylene copolymer having a density of 0.935 g/cm.sup.3 or more, (E) a linear low-density ethylene copolymer having a density of not less than 0.900 g/cm.sup.3 but less than 0.935 g/cm.sup.2, a melting point of 106.degree. C. to 130 C., a melt flow rate of 0.