| 摘要 |
PROBLEM TO BE SOLVED: To obtain a molded object having an improved water-repellency by increasing the fluorine atom content of a surface layer to a higher level than that of the inside and forming a roughened surface having a specific center line average height and a specific number of needle-like micro peakings per a unit surface area. SOLUTION: A roughened surface having a center line average height, Ra, of 0.2-3μm and 2.6×1013-1.8×1010/m2 needle-like micro peakings per a unit surface area is formed. Preferably, a fluororesin comprises a fluorocarbon resin or a fluorosilicone resin and the surface layer contains not less than 4%, further preferably 5-50%, of all the surface layer, of CF3 group of SiF3 group. The length of needle-like micro peakings is 0.3-1.5μm and the average distance between two neighboring micro peakings is 0.3-11.3μm. This surface is obtained by introducing high-energy ions having an accelerating voltage of not less than 2 kV and not more than 50 kV to a fluororesin surface to modify the surface. |
