A combination of powder coatings usable in a
powder coating method for forming a coating film having visually homogeneous hue by mixing two or more powder coatings of which each color is different. In the combination of powder coatings, each of differences in triboelectric charges of two or more powder coatings is 5.0 C/g or less. The coating method usable herein includes the step of applying onto a substrate to be coated two or more powder coatings of which each color is different, in which the triboelectric charges are controlled in the above given ranges.
An article, comprising a coated substrate obtained by coating an uncoated substrate with a single layer of a combination of two or more
powder coating, comprising two or more color powder coatings wherein the color of each power coating is different, wherein a difference in triboelectric charge of said two or more powder coating is 5.0 C/g or less; wherein particles of each
powder coating are not agglomerated; and wherein said two or more powder coatings form a single layered coating film having a homogeneous hue.
However, even if these colored powders were very fine, having a particle size of 10 m or less, it is actually not easy to form a coating film of visually homogeneous hue depending upon the combination of two or more colored powders. Moreover, those powder coatings need a granulation process or a composite-forming process, thereby making it difficult to prepare
powder coating of desired hue in a simple process.
