Patent ID: 8268069

Claim:
Pearlescent pigments consisting of glass flakes; and on the surface of the glass flake a layer sequence consisting of (A) a layer of SiO 2 , which is optionally full or partially coated with SnO 2 or SnO 2 nuclei, (B) a high-refractive-index coating having a refractive index n>1.8 which essentially consists of TiO 2 , (C) a low-refractive-index layer of SiO 2 and/or Al 2 O 3 , having a refractive index n<1.8 and optionally doped with one or more oxides of V, Zr, Zn, Ce, Ti, B, Na, K, Mg, Ca and/or Mn and optionally (D) an outer silane protective layer.