Dispersions containing pyrogenic oxides

Abstract

Dispersions of pyrogenic oxides, doped using an aerosol, are prepared by mixing the oxide with a suspending agent and milling. The dispersions can be used to prepare inkjet paper.

What is claimed is:  
     
         1 . A dispersion comprising a liquid phase and a solid phase, wherein the solid phase comprises a pyrogenic oxide, and wherein said pyrogenic oxide: 
 a) is doped with one or more doping components; and    b) has a BET surface area of between 5 and 600 m 2 /g.    
     
     
         2 . The dispersion of    claim 1   , wherein said pyrogenic oxide is silica.  
     
     
         3 . The dispersion of    claim 1   , wherein said liquid phase is water.  
     
     
         4 . The dispersion of any one of claims  1 - 3 , wherein said pyrogenic oxide is prepared by the method of flame hydrolysis or flame oxidation.  
     
     
         5 . The dispersion of any one of claims  1 - 3 , wherein said pyrogenic oxide is doped using an aerosol.  
     
     
         6 . The dispersion of any one of claims  1 - 3 , wherein said pyrogenic oxide is doped with aluminum oxide.  
     
     
         7 . The dispersion of any one of claims  1 - 3 , wherein the amount of doped material in said pyrogenic oxide is between 1 and 200,000 ppm.  
     
     
         8 . The dispersion of    claim 6   , wherein the amount of doped material in said pyrogenic oxide is between 1 and 200,000 ppm.  
     
     
         9 . The dispersion of    claim 8   , wherein said doped material is applied as a salt or a salt mixture.  
     
     
         10 . The dispersion of any one of claims  1 - 3 , wherein the solid phase in the dispersion is present in a proportion by weight of between 0.001 and 80 wt. %.  
     
     
         11 . The dispersion of    claim 6   , wherein the solid phase in the dispersion is present in a proportion by weight of between 0.001 and 80 wt. %.  
     
     
         12 . A process for preparing a dispersion according to    claim 1   , comprising: 
 a) mixing a doped pyrogenic oxide with a liquid; and    b) milling the mixture produced in step a).    
     
     
         13 . The process of    claim 12   , wherein said liquid is water and said pyrogenic oxide is silica.  
     
     
         14 . The process of    claim 12   , wherein said pyrogenic oxide is present in said liquid in a proportion by weight of between 0.001 and 80 wt. %.  
     
     
         15 . The process of    claim 12   , wherein said milling procedure is performed using an ball mill.  
     
     
         16 . The process of    claim 12   , wherein said milling procedure is performed using a pearl mill.  
     
     
         17 . The process of    claim 12   , wherein said milling procedure is performed using a high pressure milling mixture.  
     
     
         18 . A coating mixture for an inkjet paper or inkjet film comprising the dispersion of    claim 1   .