Effect pigments based on coated glass flakes

Abstract

The present invention relates to effect pigments based on thin glass flakes and to a method for the production of such pigments. The resulting pigment can be used in any application for which pearlescent pigments have been heretofore used such as, for example, in plastics, paints, inks, cosmetic formulations, coatings including solvent or waterborne automotive paint systems, powder coatings, inks and agriculture foils.

1 - 12 . (canceled) 
     
     
         13 . Effect pigments comprising glass flakes with a thickness of ≦1.0 μm, which glass flakes are coated with one or two layers of TiO 2  in the rutile modification, Fe 2 O 3 , TiFe 2 O 5 , Ti suboxides, Fe 3 O 4 , Cr 2 O 3 , Al 2 O 3 , SiO 2 , ZrO 2 , ZnO, SnO 2 , CoO, Co 3 O 4 , VO 2 , V 2 O 3 , Sn(Sb)O 2  or mixtures thereof to form said effect pigments. 
     
     
         14 . Effect pigments according to  claim 13 , wherein the softening point of the glass flakes is ≧800° C. 
     
     
         15 . Effect pigments according to  claim 13 , wherein the metal oxide is TiO 2  in the rutile modification. 
     
     
         16 . Effect pigments according to  claim 15 , characterized in that the glass flakes are coated with TiO 2  in the rutile modification, Fe 2 O 3  or a mixture of TiO 2  in the rutile modification and Fe 2 O 3 . 
     
     
         17 . Effect pigments according to  claim 13 , wherein the glass flakes are coated with one layer. 
     
     
         18 . A method of preparing effect pigments according to  claim 13 , comprising coating the glass flakes by wet chemical coating, by chemical or physical vapor deposition or electroless plating and optionally calcining the coated glass flakes. 
     
     
         19 . A product selected from the group consisting of plastics, coatings, powder coatings, paints, inks, printing inks, glasses, ceramic products, agriculture foils and cosmetic formulations, comprising effect pigments according to  claim 13  and a carrier. 
     
     
         20 . A product selected from the group consisting of conductive pigments, magnetic pigments and dopants for the laser-marking of papers and plastics, comprising effect pigments according to  claim 13 . 
     
     
         21 . A pigment formulation containing the effect pigments according to  claim 13  and a carrier. 
     
     
         22 . Effect pigments according to  claim 13 , which are as follows:
 glass flake+TiO 2  (rutile)   glass flake+Fe 2 O 3      glass flake+Fe 3 O 4      glass flake+TiFe 2 O 5      glass flake+Cr 2 O 3      glass flake+ZrO 2      glass flake+Sn(Sb)O 2      glass flake+BiOCI   glass flake+Al 2 O 3      glass flake+Ce 2 S 3  or   glass flake+MoS 2 .   
     
     
         23 . Effect pigments according to  claim 13 , which are as follows:
 glass flake+Fe 2 O 3      glass flake+Fe 3 O 4      glass flake+TiFe 2 O 5      glass flake+Cr 2 O 3      glass flake+ZrO 2      glass flake+Sn(Sb)O 2      glass flake+BiOCI   glass flake+Al 2 O 3      glass flake+Ce 2 S 3  or   glass flake+MoS 2 .   
     
     
         24 . Effect pigments according to  claim 13 , which are as follows:
 glass flake+TiO 2  (rutile).   
     
     
         25 . Effect pigments according to  claim 13 , wherein the glass have a thickness of ≦0.8 μm. 
     
     
         26 . Effect pigments according to  claim 25 , which are as follows:
 glass flake+TiO 2  (rutile)   glass flake+Fe 2 O 3      glass flake+Fe 3 O 4      glass flake+TiFe 2 O 5      glass flake+Cr 2 O 3      glass flake+ZrO 2      glass flake+Sn(Sb)O 2      glass flake+BiOCI   glass flake+Al 2 O 3      glass flake+Ce 2 S 3  or   glass flake+MoS 2 .   
     
     
         27 . Effect pigments according to  claim 13 , wherein the glass have a thickness of ≦0.5 μm. 
     
     
         28 . Effect pigments according to  claim 27 , which are as follows:
 glass flake+TiO 2  (rutile)   glass flake+Fe 2 O 3      glass flake+Fe 3 O 4      glass flake+TiFe 2 O 5      glass flake+Cr 2 O 3      glass flake+ZrO 2      glass flake+Sn(Sb)O 2      glass flake+BiOCI   glass flake+Al 2 O 3      glass flake+Ce 2 S 3  or   glass flake+MoS 2 .   
     
     
         29 . Effect pigments according to  claim 13 , wherein the glass flakes are quartz glass. 
     
     
         30 . Effect pigments according to  claim 13 , wherein the glass flakes are amorphous glass.