Water-impermeable sheet material
AssigneeHiraoka & Co., Ltd.
InventorsYoshiji Hiraoka, Tsutomu Obayashi
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Abstract
A water-impermeable sheet material capable of preventing formation of water drops thereon, has one or two water-impermeable layers, at least one of which layers holds, on the surface thereof, a water drop-preventing agent in the form of fine solid particles and consisting of at least one hydrophilic but water-insoluble substance, at least a portion of the water drop-preventing agent being exposed to the ambient atmosphere.
Claims20
A water-impermeable sheet material having one or two water-impermeable layers, at least one of which layers holds, on the surface thereof, a water drop-preventing agent in the form of fine solid particles and consisting of at least one hydrophilic but water-insoluble substance, at least a portion of said water drop-preventing agent being exposed to the ambient atmosphere.
Dependencies are inferred from the claim text.