Several agents named warmth-retaining agents were mixed in the coating layers on the polyester fabrics.
The aluminum-powder or the copper-powder which retains the warmth with reflection showed greater warmth-retention when the coating layer was on the outer side of the clothes than on the inner side.
On the other hand, carbon-powder or the oxidized iron-powder showed greater warmth-retention when the coating layer was on the inner side of the clothes than on the outer side.
Electron micrographs showed clearly the various structures in the coating layers when the warmth-retaining agents were mixed in the resin.
There were the multilayers, porous layers, and/or airly layers made with the warmth-retaining agents, air, and the resin.
Basing on these structure, roles of the warmth-retaining agents were discussed.
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