| 摘要 |
PROBLEM TO BE SOLVED: To provide a natural lighting heat insulating material which has an excellent heat insulating property, a high transparency and light weight. SOLUTION: The natural lighting heat insulating material has a structure that a plurality of resin films 11, 12, 13 are oppositely arranged with an air layer interposed therebetween, and has a visible light transmittance of 20% or more. The natural lighting heat insulating material has the air layer having a thickness of 100μm to 3 mm and has at least a sealed peripheral part of the air layer. The resin film is not particularly limited as long as it has excellent transparency and is preferably formed of, for example, polycarbonate and polyvinyl chloride. The thickness of the resin film has preferably a lower limit of 10μm and an upper limit of 300μm. The natural lighting heat insulating material exhibits a high heat insulating performance when installed in a natural lighting part of a building solely or in combination of ordinary glass. COPYRIGHT: (C)2007,JPO&INPIT
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