METHOD FOR FORMING MULTILAYER COATING FILM

[Problem] To provide a method for forming a multilayer coating film, with which it is possible to obtain a coating film which enables improved adhesion,between a surface of the coating film and an external component or the like and which exhibits excellent gasoline resistance, water resistance and a...

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Bibliographische Detailangaben
Hauptverfasser:	TSUNODA, Takeshi, KURIYAMA, Naoki, MICHIURA, Chie, WATANABE, Satoshi, GOTOU, Takeshi, OKAMOTO, Tomoyuki, FUTAMATA, Kouta
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	ADHESIVES CHEMICAL PAINT OR INK REMOVERS CHEMISTRY COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS COMPOSITIONS BASED THEREON CORRECTING FLUIDS DYES FILLING PASTES INKS MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS NATURAL RESINS ORGANIC MACROMOLECULAR COMPOUNDS PAINTS PASTES OR SOLIDS FOR COLOURING OR PRINTING POLISHES THEIR PREPARATION OR CHEMICAL WORKING-UP USE OF MATERIALS THEREFOR WOODSTAINS
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Beschreibung
Zusammenfassung:	[Problem] To provide a method for forming a multilayer coating film, with which it is possible to obtain a coating film which enables improved adhesion,between a surface of the coating film and an external component or the like and which exhibits excellent gasoline resistance, water resistance and appearance. [Solution] A method for forming a multilayer coating film by sequentially coating an intermediate coating material composition, a base coating material composition and a clear coating material composition on a metal for a motor vehicle body or resin material and then thermally curing the compositions, wherein the clear coating material composition is obtained by mixing a main agent (A) and a curing agent (B), the main agent (A) contains a hydroxy group-containing resin (A-1) and a surface conditioner (A-2) at a quantity of 0.01-3.0 mass% relative to the mass of solid content in the hydroxy group-containing acrylic resin, the hydroxy group- containing acrylic resin (A-1) has a hydroxy value of 80-250 mg KOH/g, a mass average molecular weight of 1,000-30,000 and an SP value of 9.0-12.0, the surface conditioner (A-2) is a polymer having a mass average molecular weight of 3,000-100,000, which is obtained by grafting an acrylic resin (A-2-i) and a resin (A-2-ii), the acrylic resin (A-2-i) has an SP value of 8.5-10.0, and the SP value of the resin (A-2-ii) is at least 2.0 higher than the SP value of the acrylic resin (A-2-i). La présente invention vise à fournir un procédé de formation d'un film de revêtement multicouche, avec lequel il est possible d'obtenir un film de revêtement qui permet une adhérence améliorée, entre une surface du film de revêtement et un composant externe ou équivalents et qui présente une excellente résistance à l'essence, une excellente résistance à l'eau et un excellent aspect. L'invention concerne par conséquent un procédé de formation d'un film de revêtement multicouche par revêtement séquentiel d'une composition de matériau de revêtement intermédiaire, d'une composition de matériau de revêtement de base et d'une composition de matériau de revêtement transparent sur un métal pour un corps de véhicule à moteur ou un matériau de résine, puis par durcissement thermique des compositions, la composition de matériau de revêtement transparent étant obtenue par mélange d'un agent principal (A) et un agent de durcissement (B), l'agent principal (A) contenant une résine contenant un groupe hydroxy (A-1) et un conditionneur de surface (A-2