PURPOSE: To provide a substrate surface with a highly water-repelling property economically and simply by precipitating crystalline of a wax or an oil and fat which has higher melting point than the temperature of the environments where the substrate is used on the surface of the substrate.
CONSTITUTION: A water-repelling property-imparting method to be applied for rain outfits, etc., involves heating a substrate to the temperature close to the melting point of a wax or an oil and fat and applying the wax or the oil and fat to the surface of the substrate. The method further involves cooling the substrate to room temperature to precipitate crystalline on the surface of the substrate and, if necessary, keeping the substrate at a prescribed temperature for a prescribed period to provide water repelling surface. In the case where triglyceride is for example used as the oil and fat, an excellent water-repelling surface can be obtained by keeping the substrate at about 40°C for two weeks. Or, the or oil and fat is dissolved in an organic solvent and after the obtained solution is applied to the surface of a substrate, the substrate is kept at the temperature at which the organic solvent volatilizes to precipitate crystalline on the surface of the substrate and, if necessary, the substrate is kept at a prescribed temperature for a prescribed period to provide the surface having a water repelling property.
ONDA TOMOHIKO
SATO NAOKI
TSUJII KAORU
