| 摘要 |
PROBLEM TO BE SOLVED: To provide a PVA film having both high near-infrared shielding properties and high visible light transmissibility and being very useful in various uses including heat-ray-shielding materials such as tents, pavillions, building materials, and window materials, optical materials such as infrared-cutting filters, recording materials, heat-storage materials, and near-infrared detection sensors, and to provide a method for producing the same. SOLUTION: The film comprises a polyvinyl alcohol polymer and copper sulfide microparticles, the copper sulfide microparticles of an average particle diameter of 50 nm or smaller being finely dispersed in the polymer, and satisfies the following requirements (1) and (2): (1) the average transmittance in the visible region of wavelength of 400-760 nm is 50% or higher, and (2) the average transmittance in the near-infrared region of a wavelength of 800-1,200 nm is 60% or less. COPYRIGHT: (C)2008,JPO&INPIT
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