Luster pigments based on multiply coated plateletlike silicatic substrates

Luster pigments of multiply coated platelet-shaped silicatic substrates, obtained by coating substrates, already coated with a first layer comprising a colorless or selectively absorbing metal oxide,

• a) initially with a second, nonselectively absorbing layer consisting essentially of carbon, a metal or a metal oxide, and
• b) subsequently with a third layer comprising colorless or selectively absorbing metal oxide,
• wherein
• i) the carbon layer (step a) is applied by thermal decomposition of an oxygen-containing hydrocarbon which for every two carbon atoms contains at least one oxygen atom,
• ii) the metal layer (step a) is applied by gas phase decomposition of a volatile compound of a metal in an inert gas, and
• iii) the metal oxide layer (step a and/or b) is applied by gas phase decomposition of a volatile compound of a metal in the presence of oxygen, water vapor or mixtures thereof, to said substrates coated with said second nonselectively absorbing layer a).

A process for preparing luster pigments of multiply coated platelet-shaped silicatic substrates, comprising:

• a) coating substrates, already coated with a first layer comprising a colorless or selectively absorbing metal oxide, with a second, nonselectively absorbing layer consisting essentially of carbon, a metal, or a metal oxide;
• and
• b) subsequently coating said carbon, metal, or metal oxide coated substrate with a third layer comprising colorless or selectively absorbing metal oxide said coating in step b) being optional for said metal or metal oxide coated substrate;
• wherein
• i) the carbon layer (step a) is applied by thermal decomposition of an oxygen-containing hydrocarbon which for every two carbon atoms contains at least on oxygen atom,
• ii) the metal layer (step a) is applied by gas phase decomposition of a volatile compound of a metal in an inert gas, and
• iii) the metal oxide layer (step a and/or b) is applied by gas phase decomposition of a volatile compound of a metal in the presence of oxygen, water vapor, or mixtures thereof, to the substrates coated in case a) with a first metal oxide layer and in case b) additionally with a nonselectively absorbing layer a).