| 摘要 |
To provide a method of producing a multi-layer paint film with the 3C1B system with which multi-layer paint films which have excellent paint film appearance and coating operability (sag resistance, bubbling resistance properties) can be obtained. [Means of Resolution] The invention concerns a method of forming multilayer paint films which includes a process in which an aqueous first base paint (A) is coated on an object which is to be painted and a first base paint film is formed, a process in which a second aqueous base paint (B) is coated over the aforementioned uncured first base paint film and a second base paint film is formed, a process in which a clear paint (C) is coated over the aforementioned uncured second based paint film and a clear paint film is formed and a process in which the aforementioned first base paint film, the aforementioned second base paint film and the aforementioned clear paint film are heated and cured at the same time and in which the aforementioned aqueous first base paint (A) includes as the base resin a water-soluble or water-dispersible acrylic resin (Al) of weight average molecular weight from 10,000 to 100,000 and one or more type of water-soluble or water-dispersible resin (A2), selected from among the polyester resins, polyurethane resins and acrylicurethane resins, which has a weight average molecular weight of from 10,000 to 100,000. |
