Powder coating composition for forming multilayer film

Details Powder coating composition for forming multilayer film Powder coating composition for forming multilayer film

C - Chemistry, Metallurgy

09

D

C09D 5/03 (2006.01)

Patent

CA 2300139

The present invention provides a powder coating composition for forming a multilayer film, obtainable by dry blending a lower layer-forming thermosetting powder coating material (A) and an upper layer-forming thermosetting powder coating material (B), wherein at least one of the following conditions is satisfied: (I) the material (A) contains an onium salt compound; (II) particles of 45 µm or smaller diameter account for at least 90 wt.% of each of the materials (A) and (B); and (III) the material (A) is higher than the material (B) in melt viscosity (Pa.cndot.s) measured at 130°C. The powder coating composition of the invention is capable of sufficiently separating into layers and forming a multilayer film with excellent properties.

Cette invention se rapporte à une composition de revêtement pulvérulente destinée à former un film multicouche, que l'on prépare en mélangeant à sec un matériau de revêtement pulvérulent thermodurcissable (A), destiné à former une couche inférieure, avec un matériau de revêtement pulvérulent thermodurcissable (B) destiné à former une couche supérieure, et qui se caractérise en ce que; (I) le matériau (A) contient un composé sel d'onium, (II) les particules d'un diamètre égal ou inférieur à 45 mu m constituent au moins 90 % en poids de chacun des matériaux (A) et (B), ou (III) la viscosité à l'état fondu (Pa.s) du matériau (A) à 130 DEG C est supérieure à celle du matériau (B) à la même température. Cette composition possède d'excellentes propriétés de séparation entre les couches, ce qui donne un film multicouche produisant d'excellentes performances en tant que film.

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