powder coating
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 μC/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.
1. An article, comprising a coated substrate obtained by coating an uncoated substrate with a single layer of a combination of two or more powder coatings, 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 coatings is 5.0 μC/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.
2. The article according to claim 1, wherein each of differences in true specific gravities of said two or more powder coatings is 0.15 g/cc or less.
3. The article according to claim 1, wherein each of differences in apparent densities of said two or more powder coatings is 0.020 g/cc or less.
4. The article according to claim 1, wherein each of differences in softening points of said two or more powder coatings is 5.0° C. or less, the softening points being measured using a capillary rheometer.
5. The article according to claim 1, wherein each of differences in dielectric constants of said two or more powder coatings is 0.20 or less.
6. The article according to claim 1, wherein each of ratios of the electric resistance of said two or more powder coatings is from 0.1 to 10.
7. The article according to claim 1, wherein at least one powder coating is a white powder coating containing a white pigment, and the remaining powder coatings comprise no white pigments.
8. The article according to claim 1, wherein the average particle size of the powder coating is from 1 to 50 μm.
9. The article according to claim 1, wherein the average particle size of the powder coating exceeds 10 μm.
10. The article according to claim 1, wherein said combination is prepared by mixing two or more per coatings such that the difference in triboelectric charge of said two or more powder coatings is 5.0 μC/g or less.
11. The article according to claim 1, wherein said article consists essentially of: a coated substrate obtained by coating an uncoated substrate with a single layer of a combination of two or more powder coatings, comprising two or more color powder coatings wherein the color of each powder coating is different, wherein a difference in triboelectric charge of said two or more powder coatings is 5.0 μC/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.
12. The article according to claim 1, wherein said article consists of: a coated substrate obtained by coating an uncoated substrate with a single layer of a combination of two or more powder coatings, comprising two or more color powder coatings wherein the color of each powder coating is different, wherein a difference in triboelectric charge of said two or more powder coatings is 5.0 μC/g or less; wherein particles of ch powder coating are not agglomerated; and wherein said two or more powder coatings form a single layered coating film having a homogeneous hue.
13. An article, comprising a coated substrate obtained by coating an uncoated substrate with a single layer of a powder coating composition which comprises two or more color powder coatings wherein the color of each powder coating is different, a difference in triboelectric charge of said two or more powder coatings is 5.0 μC/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.
14. The article according to claim 13, wherein a difference in true specific gravities of said two or more color powder coatings is 0.15 g/cc or less.
15. The article according to claim 13, wherein a difference in apparent densities of said two or more color powder coatings is 0.020 g/cc or less.
16. The article according to claim 13, wherein a difference in softening points of said two or more color powder coatings is 5.0° C. or less, the softening points being measured using a capillary rheometer.
17. The article according to claim 13, wherein a difference in dielectric constants of said two or more color powder coatings is 0.20 or less.
18. The article according claim 13, wherein each of ratios of electric resistance of said two or more color powder coatings if from 0.1 to 10.
19. The article according to claim 13, wherein the average particle size of the powder coating is from 1 to 50 μm.
20. The article according to claim 13, wherein the average particle size of the powder coating exceeds 10 μm.
21. The article according to claim 13, wherein said article consists essentially of: a coated substrate obtained by coating an uncoated substrate with a single layer of a powder coating composition which comprises two or more color powder coatings wherein the color of each powder coating is different, a difference in triboelectric charge of said two or more powder coatings is 5.0 μC/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.
22. The article according to claim 13, wherein said article consists of: a coated substrate obtained by coating an uncoated substrate with a single layer of a powder coating composition which comprises two or more color per coatings wherein the color of each powder coating is different, a difference in triboelectric charge of said two or more powder coating is 5.0 μC/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.
23. An article, comprising a coated substrate obtained by coating an uncoated substrate with a single layer of a powder coating composition which comprises two or more color powder coatings, each of said two or more powder coatings comprising: a resin; and at least one colorant, wherein (1) each of said two or more color powder coatings has a different color, (2) a difference in triboelectric charge of said two or more color powder coatings is 5.0 μC/g or less, (3) the particles of each color powder coating are not agglomerated, and (4) said powder coating composition forms a single layered coating film having a visually homogeneous hue.
24. The article according to claim 1, 13, or 23, wherein one powder coating is a white powder coating containing a white pigment and the other powder coatings contain no white pigment.
25. The article according to claim 23, wherein said article consists essentially of: a coated substrate obtained by coating an uncoated substrate with a single layer of a powder coating composition which comprises two or more color powder coatings, each of said two or more powder coatings comprising: a resin; and at least one colorant, wherein (1) each of said two or more color powder coatings has a different color, (2) a difference in triboelectric charge of said two or more color powder coatings is 5.0 μC/g or less, (3) the particles of each color powder coating are not agglomerated, and (4) said powder coating composition forms a single layered coating film having a visually homogeneous hue.
26. The article according to claim 23, wherein said article consists of: a coated substrate obtained by coating an uncoated substrate with a single layer of a powder coating composition which comprises two or more color powder coatings, each of said two or more powder coatings comprising: a resin; and at least one colorant, wherein (1) each of said two or more color powder coatings has a different color, (2) a difference in triboelectric charge of said two or more color powder coatings Is 5.0 μC/g or less, (3) the particle of each color powder coating are not agglomerated, and (4) said powder coating composition forms a single layered coating film having a visually homogeneous hue.
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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 μC/g or less.
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