| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a film which has proofness to moisture permeation and water and heat-shielding properties and anticorrosion properties withstanding severe high-temperature, high-humidity conditions.SOLUTION: A porous film contains 0.10-30 mass pts. of metal particles of particle sizes of 0.5-40μm and an aspect ratio, or the ratio of the particle size to the thickness of the particle, of 1.5 or higher and 10-70 mass pts. of a non-metallic filler of particle sizes of 0.5-40μm in 100 mass pts. of a resin substrate of the film and is drawn uniaxially 1.1-5 times to form holes in parts of the non-metallic filler. The composite film has a moisture permeation resistance of 0.04-0.19 ms PA/μg, an infrared reflectance of 60% or higher and an infrared transmittance of 30% or lower, causes no change in appearance, e.g. whitening or red-browning due to corrosion of metal, after leaving under the high-temperature, high-humidity condition of 70°C×90%RH×72 h and retains, from the initial value, an infrared reflectance of 70% or higher.</p> |
