Patent ID: 8512855

Claim:
A self-cleaning member comprising a substrate and a coating layer having a porous surface provided on or above the substrate, the coating layer comprising a hydrophobic resin, and whiskers, wherein the porous surface has a contact angle hysteresis Δθ (=θa−θr), which is a difference between an advancing contact angle θa and a receding contact angle θr measured by dynamic contact angle measurement by an extension/contraction method, of 80 degrees or more and a receding contact angle of 25 degrees or less, has a static contact angle of water of 80 degrees to 130 degrees, wherein a weight ratio of the hydrophobic resin to the whisker in the coating layer is 2 or more to 5.5 or less, a ratio of a sum of the solid weight of the hydrophobic resin and the whiskers to the total solid weight of the coating layer is 0.4 or more to 1.0, and wherein the coating layer does not contain photocatalyst particles.