Pearlescent pigment based on fine, thin substrates

Pearlescent pigment comprises a substantially transparent, platelet-shaped substrate having a thickness of delta sand at least one optically active coating having a thickness of delta m, where the substrate has an average size (d 5 0) of 3-8 mu m and an average height (h s) of 40-110 nm. Independent...

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Bibliographische Detailangaben
Hauptverfasser:	KAUPP, GUENTHER, SCHMIDT, ULRICH, GRUENER, MICHAEL, SCHNEIDER, RALPH, STEINBACH, KATRIN, HENGLEIN, FRANK, KRUEGER, PETER, DEPNER, JENS
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	ADHESIVES CHEMISTRY DYES METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS NATURAL RESINS PAINTS POLISHES PREPARATION OF CARBON BLACK TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS,TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES
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Beschreibung
Zusammenfassung:	Pearlescent pigment comprises a substantially transparent, platelet-shaped substrate having a thickness of delta sand at least one optically active coating having a thickness of delta m, where the substrate has an average size (d 5 0) of 3-8 mu m and an average height (h s) of 40-110 nm. Independent claims are included for: (1) a method for preparing the pearlescent pigment, comprising (a) classifying the transparent substrate to obtain a substrate having an average height (h s) of 40-110 nm and (b) coating the classified substrate with an optically active, preferably highly refractive, layer to obtain a pearlescent pigment having an average size (d 5 0) of 3-8 mu m; and (2) a method for calculating the average layer thickness (h s) of a platelet-shaped substrate, which is an effective pigment comprising a platelet-shaped substrate having a thickness of delta sand at least one optically active coating having a thickness of delta maccording to a formula given in the specification.