Pigments

Abstract

A process for the manufacture of a pigment concentrate which comprises dispersing dry organic pigment granules in an organic vehicle.

We claim:  
     
       1. A process for the preparation of a pigment concentrate which comprises  comprising  
       a) dispersingproducing dried organic pigment granulates obtained  by  
         1 ) wet granulation in an ink varnish  using an extruder granulator followed by drying of the granular extrudate,  
         2 ) spray drying,  
         3 ) in-vat granulation or  
         4 ) fluid-bed granulation,  
       b) wherein said dispersion is carried outdispersing said dried organic pigment granulates in an ink varnish, using a kneader, a kneader/extruder or an extruder.  
     
     
       2. A process as claimed in  claim 1  in which the dry pigment granules contain 0-5% moisture. 
     
     
       3. A process as claimed in  claim 1  in which the dry granules have a mean size of 0.1 to 50 mm. 
     
     
       4. A process as claimed in  claim 1  in which the pigment is an azo, azomethene, copper phthalocyanine, anthraquinone, nitro, perinone, quinacridone, azo or azomethine metal salt or complex or dipyrolopyrole pigment, or mixtures thereof. 
     
     
       5. A process as claimed in  claim 1  in which the pigment is resinated with a natural or synthetic resin. 
     
     
       6. A process as claimed in  claim 1  in which the pigment granules also contain a non-polar component. 
     
     
       7. A dispersed pigment concentrate which is produced by a process as claimed to  claim 1 . 
     
     
       8. A concentrate as claimed in  claim 7  which contains from 40 to 80% of pigment.