Patent ID: 6921559
Filing Date: 2005-07-26
Classification: C09D,Y10T

Abstract:
1. A powder coating composition which comprises a mixture of first and second component powder coating compositions, there being a triboelectric interaction factor τ between the component powder coating compositions of ≧25, the value of τ being given by the relationship where with L*, a* and b* being respectively the z, x and y coordinate variables under the CIE L*a*b* ΔE (pure compositions) being determined by color spectrophotometric measurement and ΔE (composition mixture) being determined by mixing the two component compositions in equal weight proportions, causing charging of the resulting mixture by tribostatic interaction to establish equilibrium tribostatically charged conditions, directing the charged mixture onto two oppositely charged plates, resulting in a separation of the compositions on the two plates, and then determining ΔE, by color spectrophotometric measurement, between the compositions as applied to the two plates, one or both of the respective initial pure component compositions being dyed where appropriate to provide an enhanced ΔE between them to facilitate the determination of ΔE (pure compositions) and ΔE (composition mixture).