Patent ID: 7799126

Claim:
A pigment comprising a flake-form substrate and an anion-binding layer which comprises an anion-forming organic, inorganic and/or organometallic colorant, wherein natural and synthetic clay minerals are excluded as substrate, wherein the flake-form substrate is a glass flake, SiO 2 flake, Al 2 O 3 flake, synthetic or natural flake-form iron oxide, synthetic or natural graphite and/or a flake-form metal, wherein the anion-binding layer comprises a layered double hydroxide of formula M 2+ 1-x M 3+ x (OH) 2 (Z n− ) x/n .mH 2 O wherein 0.2<x<0.33, M 3+ is Al 3+ , Cr 3+ , Fe 3+ , Ga 3+ , In 3+ , Y 3+ , La 3+ and/or Ce 3+ , M 2+ is Ba 2+ , Ca 2+ , Cu 2+ , Mg 2+ , Sr 2+ and/or Zn 2+ , Z is a counterion of a metal salt and/or an anion or anion mixture of an anion-forming organic, inorganic and/or organometallic colorant, n is the charge number of Z, and m is a stoichiometric factor and indicates the content of water of crystallisation, and wherein the anion-forming organic and/or inorganic colorant is in a proportion of 0.01 to 30% by weight based on the pigment as a whole.