Antiviral material, antiviral film, antiviral fiber, and antiviral product

An antiviral film, comprising:

• tungsten oxide microparticles having a mean primary particle diameter (D50) in a range of 5.5 to 75 nm, the mean primary particle diameter (D50) being a D50 diameter of integrated diameter with reference of volumes of 50 pieces or more of microparticles extracted from an image analysis of a SEM or TEM photograph of the microparticles;
• and
• an inorganic binder for binding the tungsten oxide microparticles, a content of the inorganic binder in the antiviral film being from 5 to 95 mass %, and the inorganic binder being made only of an amorphous metal oxide,
• wherein in a X-ray diffraction chart when the tungsten oxide microparticles are measured by X-ray diffractometry, an intensity ratio of a peak A to a peak D (A/D) and an intensity ratio of a peak B to the peak D (B/D) are in a range of 0.7 to 2.0, and an intensity ratio of a peak C to the peak D (C/D) is in a range of 0.5 to 2.5, wherein the peak A is a peak existing in 2θ range from 22.8 to 23.4°, the peak B is a peak existing in 2θ range from 23.4 to 23.8°, the peak C is a peak existing in 2θ range from 24.0 to 24.25°, and the peak D is a peak existing in 26 range from 24.25 to 24.5°,
• wherein the tungsten oxide microparticles contain 15% or more of microparticles having a primary particle diameter of 40 nm or less,
• wherein a thickness of the antiviral film is in a range of from 2 to 400 nm, and
• wherein the tungsten oxide microparticles have an inactivation effect R of 2 or more, as expressed by following:
• R=log C−log A
• wherein C denotes a virus titer tissue culture infective dose (TCID50) obtained after irradiating an unprocessed specimen with visible light for 24 hours, and A denotes a virus titer TCID50 obtained when the specimen is tested in the following manner:
• a) said microparticles are adhered to a specimen in a range of 0.01 mg/cm 2 to 40 mg/cm2;
• b) the specimen from step (a) is inoculated by a virus titer, wherein said virus is selected from a pathogenic avian influenza virus H9N2, H5N1, and a swine influenza virus;
• c) said inoculated specimen from step (b) is irradiated with visible light having a wavelength of 380 nm or more and an illuminance of 6000 lx for 24 hours using a white fluorescent lamp and an ultraviolet cutting filter, and then evaluated for antibacterial activity of photocatalytic products under photoirradiation by Test method JIS-R-1702 (2006).