Glazing pigment and method for the production thereof

Abstract

In a method for the manufacture of a nacreous pigment, in which a multilayer film is produced by vacuum evaporation coating on a substrate and, after release from the substrate, the particles thus produced are comminuted to pigment particles of a desired size, vapor deposition of a plurality of layers taking place at separate locations within an evacuable container and the substrate being passed along the sources of evaporation, it is provided that at least a backing (A), in particular a silicon oxide layer, and at least a metal oxide layer (B), in particular a titanium oxide layer, are vapor-deposited on the substrate, in particular a circulating metal belt.

1 . A method for the manufacture of a nacreous pigment, in which a multilayer film is produced by vacuum evaporation coating on a substrate and, after release from the substrate, the particles thus produced are comminuted into pigment particles of a desired size, vapor deposition of a plurality of layers taking place at separate locations within an evacuable container and the substrate being passed along the sources of evaporation, characterized in that at least a backing (A), in particular a silicon oxide layer, and at least a metal oxide layer (B), in particular a titanium oxide layer, are vapor-deposited on the substrate, in particular a circulating metal belt.  
     
     
         2 . A method according to  claim 1 , characterized in that first a metal oxide layer (B), in particular a titanium oxide layer, is vapor-deposited, then a backing (A), in particular a silicon oxide layer, and then another metal oxide layer (B′), in particular a titanium oxide layer.  
     
     
         3 . A method according to  claim 2 , characterized in that the metal oxide layers (B, B′) have varying thicknesses.  
     
     
         4 . A method according to  claim 1 , characterized in that, on a metal oxide layer (B), in particular a titanium oxide layer, a backing (A), in particular a silicon oxide layer, is vapor-deposited, which is followed by another metal oxide layer (B′), in particular a titanium oxide layer, and an aluminum layer.  
     
     
         5 . A method according to  claim 4 , characterized in that a silicon oxide protective layer is vapor-deposited on the aluminum layer.  
     
     
         6 . A method according to  claim 1 , characterized in that, on a metal oxide layer (B), in particular a titanium oxide layer, a backing (A), in particular a silicon oxide layer, is vapor-deposited, on which is vapor-deposited a metal layer, then a metal oxide layer, in particular a silicon oxide layer, and another metal oxide layer, in particular a titanium oxide layer.  
     
     
         7 . A method according to  claim 6 , characterized in that the metal is aluminum, chromium, gold, copper or the like.  
     
     
         8 . A method according to  claim 1 , characterized in that, on a metal oxide layer (B), in particular a titanium oxide layer, a backing (A), in particular a silicon oxide layer, is vapor-deposited, which is followed by a metal layer (C).  
     
     
         9 . A method according to  claim 8 , characterized in that the metal is aluminum, chromium, gold, copper, silver or the like.  
     
     
         10 . A method according to one of  claims 1  to  9 , characterized in that the thickness of the backing (A) ranges between 20 and 1000 nm.  
     
     
         11 . A method according to one of  claims 1  to  10 , characterized in that the thickness of the metal oxide layer (B) ranges between 20 and 500 nm.  
     
     
         12 . A method for the manufacture of a nacreous pigment, characterized in that first the backing is produced by vacuum evaporation coating of a circulating metal belt and, after release from the substrate, the backing particles thus produced are comminuted to a desired size, these backing particles subsequently being provided by wet coating with at least another layer.  
     
     
         13 . A method according to  claim 12 , characterized in that the backing particles consist of silicon oxide, silicate, boron oxide, borates, aluminum oxide, aluminates, titanium boride (TiB 2 ) or mixtures thereof.  
     
     
         14 . A method according to  claim 12 , characterized in that the backing particles comprise network formers or network modifiers and/or barium sulfate for surface smoothing and/or soluble or insoluble inorganic or organic colorants.  
     
     
         15 . A method according to  claim 12 , characterized in that the layers applied by wet chemical deposition consist of oxides of the metals zirconium, chromium, titanium, iron, zinc, oxide hydrates of these metals, ferrotitanium, titanium suboxides or mixtures thereof.  
     
     
         16 . A method according to  claim 15 , characterized in that the metal oxides are reduced.  
     
     
         17 . A method according to  claim 12 , characterized in that additional coatings are applied for light stabilization and weathering resistance.  
     
     
         18 . A method for the manufacture of a nacreous pigment, characterized in that a single optically active layer consisting of titanium oxide, iron oxide, titanium suboxides, molybdenum sulfide or ferrotitanium oxide is produced by vacuum evaporation coating on a circulating metal belt; and, after release from the substrate, the particles thus produced are comminuted to a desired size; and subsequently light stabilization and weathering resistance coatings are applied by wet chemical deposition.  
     
     
         19 . A method according to  claim 18 , characterized in that the optically active layer has a thickness in the order of magnitude ranging from 20 to 500 nm, preferably from 40 to 100 nm.  
     
     
         20 . A method according to  claim 1 , characterized in that a metal oxide layer, in particular a titanium oxide layer, a metal layer and another metal oxide layer, in particular a titanium oxide layer, are vapor-deposited on a substrate, in particular a circulating metal belt.  
     
     
         21 . A method according to  claim 20 , characterized in that the metal is aluminum, chromium, gold, copper, silver or the like.  
     
     
         22 . A nacreous pigment produced in accordance with the method according to one of the preceding  claims 1  to  21 .  
     
     
         23 . A paint, lacquer, cosmetic or plastic material comprising a nacreous pigment according to  claim 22 .  
     
     
         24 . Use of a nacreous pigment according to  claim 22  for the production of paints, lacquers, cosmetics and plastics.