Colored pigments
AssigneeMerck Patent GmbH
InventorsSabine Schoen, Christoph Schmidt
Life of this patent
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Abstract
The present invention relates to colored pigments based on multicoated platelet-shaped substrates which are distinguished by the fact that they comprise (A) a coating having a refractive index of n>1.8 and a layer thickness of 20-500 nm, (B) a colorless coating having a refractive index of n≦1.8 and a layer thickness of 10-100 nm, (C) a colorless coating having a refractive index of n>1.8 and a layer thickness of 20-500 nm, (D) a covering of absorbent pigment particles having a particle size of 1-500 nm, and optionally (E) an outer protective layer, and to their use in paints, coatings, printing inks, plastics, ceramic materials, glasses, for laser marking, in cosmetic formulations and for the production of pigment preparations and dry preparations.
Claims16
A colored pigment comprising a transparent platelet-shaped substrate which is mica, glass, talc, kaolin, aluminium oxide, SiO2, or BiOCl, and thereon
- (A) an optionally functional coating having a refractive index of n>1.8 and a layer thickness of 20-500 nm,
- (B) an optionally functional colourless coating having a refractive index of n≦1.8 and a layer thickness of 10-100 nm,
- (C) an optionally functional colourless coating having a refractive index of n>1.8 and a layer thickness of 20-500 nm,
- (D) a covering of absorbent pigment particles having a particle size of 1-500 nm, and
- optionally
- (E) an outer protective layer.
A dry preparation, in the form of pellets, granules, chips or briquettes, comprising a pigment in turn comprising
- a platelet-shaped substrate, and thereon
- (A) a coating having a refractive index of n>1.8 and a layer thickness of 20-500 nm,
- (B) a colorless coating having a refractive index of n≦1.8 and a layer thickness of 10-100 nm,
- (C) a colorless coating having a refractive index of n>1.8 and a layer thickness of 20-500 nm,
- (D) a covering of absorbent pigment particles having a particle size of 1-500 nm, and
- optionally
- (E) an outer protective layer.
A colored pigment consisting of a transparent platelet-shaped substrate which is mica, glass, talc, kaolin, aluminium oxide, SiO2, or BiOCl, and thereon
- (A) a coating having a refractive index of n>1.8 and a layer thickness of 20-500 nm,
- (B) a colorless coating having a refractive index of n≦1.8 and a layer thickness of 10-100 nm,
- (C) a colorless coating having a refractive index of n>1.8 and a layer thickness of 20-500 nm,
- (D) a covering of absorbent pigment particles having a particle size of 1-500 nm, and
- optionally
- (E) an outer protective layer.
A colored pigment comprising a transparent platelet-shaped substrate which is mica, glass, talc, kaolin, aluminium oxide, SiO2, or BiOCl, and thereon
- (A) an optionally functional coating having a refractive index of n>1.8 and a layer thickness of 20-500 nm,
- (B) an optionally functional colorless coating having a refractive index of n≦1.8 and a layer thickness of 10-100 nm,
- (C) an optionally functional colorless coating having a refractive index of n>1.8 and a layer thickness of 20-500 nm,
- (D) a covering of absorbent pigment particles having a particle size of 1-500 nm, and
- optionally
- (E) an outer protective layers,
- whereby said pigment possesses high hiding power and little or no angle dependence of the interference color.
Dependencies are inferred from the claim text.