Self-cleaning member and coating composition
AssigneeToto Ltd.
InventorsHiromasa Tokudome, Koji Okubo, Kyoko Kataoka, Saori Sonokawa, Hiroyuki Fujii
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Abstract
A self-cleaning member comprising a member having a porous surface is disclosed. The member 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 a dynamic contact angle measurement with an extension/contraction method, of 80 degree or more at the surface layer and a receding contact angle θr of 25 degree or less, is capable of forming a water film on the surface by water provided and of allowing an ionic or reactive contaminant to be washed away without fixation.
Claims41
A self-cleaning member comprising a member having a porous surface, wherein
- the surface layer 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 degree or more and a receding contact angle of 25 degree or less, and is capable of forming a water film on the surface by water provided and of allowing an ionic or reactive contaminant to be washed away without fixation.
A self-cleaning coating composition comprising at least hydrophobic resin emulsion particles, whiskers, photocatalyst particles and water, wherein
- the coating composition has a weight ratio of the hydrophobic resin emulsion particles to the whiskers of 2 or more and 5.5 or less, and wherein
- the coating composition has a ratio of a sum of the solid weight of the hydrophobic resin emulsion particles and the whiskers to the total solid weight of the coating composition of 0.4 or more and 1.0 or less.
Dependencies are inferred from the claim text.