Patent ID: 8114211

Claim:
Pearlescent pigments based on a flake-form substrate, which have the following layer sequence: substrate+SiO 2 +TiO 2 +FeOOH, substrate+SiO 2 +TiO 2 +SiO 2 +FeOOH, substrate+SiO 2 +FeOOH+TiO 2 , substrate+SiO 2 +TiO 2 +SiO 2 +TiO 2 +FeOOH, substrate+SiO 2 +TiO 2 +SiO 2 +TiO 2 +SiO 2 +FeOOH, substrate+SiO 2 +FeOOH+SiO 2 +TiO 2 , substrate+SiO 2 +FeOOH+SiO 2 +TiO 2 +SiO 2 +TiO 2 , substrate+SiO 2 +FeOOH+TiO 2 +SiO 2 +TiO 2 , substrate+TiO 2 +SiO 2 +FeOOH, substrate+TiO 2 +SiO 2 +TiO 2 +FeOOH, substrate+TiO 2 +SiO 2 +TiO 2 +SiO 2 +FeOOH, substrate+FeOOH+SiO 2 +TiO 2 , substrate+FeOOH+SiO 2 +TiO 2 +SiO 2 +TiO 2 , or substrate+FeOOH+TiO 2 +SiO 2 +TiO 2 , and optionally a colourless coating comprising one or more layers having a refractive index of <1.8.