Prior Art Used In Latest Powder Coating

The powder coating of the present invention comprises a particulate material comprising

at least a binder resin and a hardener and an external additive.

The content of the binder is preferably from 50% to 90% by weight of the powder coating. Examples of the binder resin include epoxy resin, acrylic resin, phenolic resin, xylene resin, urea resin, melamine resin and polyester resin.

The content of the hardener is preferably from 2 to 20% by weight of the powder coating. Examples of the hardener include isocyanate, amine, polyamide, acid anhydride, polysulfide, trifluoroboric acid, acid dihydrazide, and imidazole.

The particulate material can further comprise a filler such as barium sulfate, calcium carbonate, aluminum oxide and calcium silicate, a leveling agent such as acryl oligomer and silicone, a coloring agent such as titanium oxide, chromium oxide, iron oxide and carbon black, an anti-foaming agent, etc. as desired. These components can be added in a total amount of from 5% to 40% by weight of the powder coating.

If the percent coverage by the external additive falls below 30%, the resulting powder coating cannot be provided with a sufficient fluidity and thus exhibits a poor storage stability and leaves something to be desired in the uniformity of film obtained therefrom. On the contrary, if the percent coverage by the external additive exceeds 200%, flowability of the powder coating at a molten state is lowered to cause deteriorated levelling of the coated film. For obtaining a film having excellent levelling, the percent coverage X is preferably from 40% to 150%.

by: ericfu

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