Effect pigments coated with organic binders for powder paints, and a method for producing said coated effect pigments and their use

Abstract

The invention relates to coated effect pigments, wherein the coating comprises a binder which is suitable for powder paints. They comprise a crystalline and an amorphous fraction which is determined by C13 NMR MAS relaxation measurements, the relaxation of the 13C cores being fitted as a biexponential relaxation according to the formula (II) and the degree of crystallinity c being in a range between 40 to 85%, and relaxation having a short average relaxation time T1S and a long average relaxation time T1I, and T1I being in a range of from 65 to 130 s. The effect pigments coated according to the invention have at least one endothermic peak with a maximum from a range of Tmax=100 to 150° C. and an enthalpy ΔH associated with said peak from a range of 15 J/g to 80 J/g in DSC at a feed speed of 5° C./min, the enthalpy being calculated relative to the amount of the binder. The binders are applied to the effect pigment by way of spontaneous precipitation. M ⁡ ( t , M 0 , a , c , T 1 s , T 1 l ) = M 0 · [ ( 1 - c ) · ( 1 - a · e - ( t T 1 s ) ) + c · ( 1 - a · e - ( t T 1 l ) ) ] ( II )

Dependencies are inferred from the claim text.