Patent ID: 7732045
Filing Date: 2010-06-08
Classification: C08J,Y10T

Abstract:
1. A film for a membrane structure, wherein the film comprises: a film substrate; a photocatalyst layer; and an interlayer interposed between the film substrate and the photocatalyst layer, wherein the film substrate comprises at least one fluororesin selected from the group consisting of an ethylene/tetrafluoroethylene copolymer, a tetrafluoroethylene/hexafluoropropylene copolymer, a tetrafluoroethylene/perfluoro(alkyl vinyl ether) copolymer, a polyvinyl fluoride and a polyvinylidene fluoride, wherein the interlayer comprises a zirconia curing agent and an organic-inorganic hybrid polymer obtained by hydrolyzing/co-condensing at least one member selected from the group consisting of an organosilane, a hydrolysate of an organosilane and a condensate of an organosilane, and a silyl group-containing organic polymer, wherein the mass remaining ratio of the organic-inorganic hybrid polymer is from 50% to 80% at 500° C. measured by thermogravimetric analysis, wherein the photocatalyst layer comprises a zirconia curing agent and a photocatalyst, wherein the film substrate exhibits a surface tension of at least 38 mN/m as a result of having been subjected to a corona discharge surface treatment, wherein adhesion between the film substrate and the interlayer is at least 85% as measured by a cross-cut method in accordance with JIS K5600, wherein the water contact angle on a surface of the photocatalyst layer is at most 5° as measured after the following weather resistance test, and wherein the change in haze is at most 3% as measured before and after the following weather resistance test: weather resistance test: while the film is irradiated with ultraviolet rays at a wavelength of from 300 nm to 400 nm at an intensity of 100 mW/cm