Interference pigments
AssigneeMerck Patent Gesellschaft
InventorsChristoph Schmidt, Gerhard Pfaff, Christina Schank, Sabine Schoen
Life of this patent
Estimating the term…
Abstract
The present invention relates to interference pigments on the basis of multiply coated, platelet-shaped substrates which comprise at least one layer sequence comprising (A) a coating having a refractive index n≧2.0, (B) a colorless coating having a refractive index n≦1.8, and (C) a nonabsorbing coating of high refractive index, and, if desired, (D) an external protective layer.
Claims13
An interference pigment comprising a multiply coated, platelet-shaped substrate (S) having at least one layer sequence comprising
- (A) a coating having a refractive index n>2.0,
- (B) a colourless coating having a refractive index n>1.8, and
- (C) a nonabsorbing coating of high refractive index.
An interference pigment comprising a multiply coated, platelet-shaped substrate having at least one layer sequence comprising
- (A) a coating having a refractive index n>2.0, selected from the group consisting of iron oxide, bismuth oxychloride, zirconium oxide, bismuth vanadate, cobalt aluminate or a mixture thereof,
- (B) a colourless coating having a refractive index n>1.8, selected from the group consisting of titanium dioxide, tin oxide, zinc oxide or a mixture thereof,
- (C) a nonabsorbing coating of high refractive index, and,
- (D) an external protective layer.
Dependencies are inferred from the claim text.