| 摘要 |
PROBLEM TO BE SOLVED: To effectively prevent the tap attaching face of a sink from fur staining by depositing and sticking of minor components in water by chemically binding a stainproofing agent film at least on the tap attaching face of the rear part of a sink, which is alternately and repeatedly wetted and dried, to shield hydroxy groups on the surface. SOLUTION: A glaze film containing an antibacterial agent is formed on the surface of the ground 32 on the whole sink 10. A water repellent agent 36 film is formed as a stainproofing agent on the surface of the glaze 34 in the tap attaching face 16 and the back guard part 18. The water repellent agent 36 has fluorocarbon groups at ends and chemical reactive groups with chemical reactivity to hydroxy groups on the surface of a porcelain of the sink 10 on the opposite ends. The water repellent agent 36 is applied on the surface of the sink 10 and reacts to and chemically combined with hydroxy groups on the surface to form a film of the water repellent agent 36 on the surface. Hydoxy groups on the surface on the film forming part of the sink 10 surface is brought into a shielding condition.
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