Complex Inorganic Effect Materials

Abstract

The present invention relates to a complex inorganic color effect material based on multiply coated platelet-shaped substrates wherein one of the layers is a complex inorganic colored pigment. The present color effect material may be used in automotive applications, security inks, and decorative coatings.

1 . A color effect material comprising a laminar substrate having at least one layer sequence comprising:
 (A) a coating having a high refractive index disposed on the substrate;   (B) a coating having a low refractive index disposed on said layer (A);   (C) a coating having a high refractive index disposed on said layer (B); and   (D) optionally, an external layer disposed on said layer (C); wherein one or more of layers (A), (C), or (D) comprise copper chromite.   
     
     
         2 . The color effect material of  claim 1  wherein layer (D) is copper chromite. 
     
     
         3 . The color effect material of  claim 1  wherein the layer (B) has a refractive index of ≦1.9. 
     
     
         4 . The color effect material of  claim 1  wherein the layer (B) is silicon dioxide. 
     
     
         5 . The color effect material of  claim 1  wherein the layer (A) and the layer (C) both have a refractive index of ≧1.95. 
     
     
         6 . The color effect material of  claim 1  wherein the layer (A) and the layer (C) both are metal oxides and the layer (D) is copper chromite. 
     
     
         7 . The color effect material of  claim 1  wherein the layer (A) is a metal oxide, the layer (C) is copper chromite. 
     
     
         8 . The color effect material of  claim 1  wherein the layer (A) is iron oxide. 
     
     
         9 . A color effect material comprising a laminar substrate having at least one layer sequence comprising:
 (A) a coating having a high refractive index disposed on the substrate;   (B) a coating having a low refractive index disposed on said layer (A);   (C) a coating having a high refractive index disposed on said layer (B); and   (D) an external layer disposed on said layer (C), layer (D) being a complex inorganic color effect pigment.   
     
     
         10 . The color effect material of  claim 9  wherein the complex inorganic color effect pigment of the layer (D) is copper chromite. 
     
     
         11 . The color effect material of  claim 9  wherein the layer (B) has a refractive index of ≦1.9. 
     
     
         12 . The color effect material of  claim 9  wherein the layer (B) is silicon dioxide. 
     
     
         13 . The color effect material of  claim 9  wherein the layer (A) and the layer (C) both have a refractive index of ≧1.95. 
     
     
         14 . The color effect material of  claim 9  wherein the layer (A) and the layer (C) both are metal oxides. 
     
     
         15 . The color effect material of  claim 9  wherein the layer (A) and/or the layer (C) are complex inorganic color effect pigment. 
     
     
         16 . The color effect material of  claim 9  wherein the layer (A) is iron oxide. 
     
     
         17 . The color effect material of  claim 9  wherein the layer (A) is a metal oxide and the layer (C) is a complex inorganic effect pigment. 
     
     
         18 . The color effect material of  claim 14  wherein the layer (D) is copper chromite. 
     
     
         19 . The color effect material of  claim 18  wherein the layer (A) is iron oxide. 
     
     
         20 . The color effect material of  claim 12 , wherein the layer (A) is iron oxide.