Diketopyrrolopyrrole pigments in platelet form

Abstract

Organic pigments selected from the diketopyrrolopyrrole, azo, isoindolinone and isoindoline series, which pigments consist of .Iadd.at least .Iaddend.50% by weight of platelets which are from 5 to 50 μm long, 2 to 50 μm wide and 0.01 to 5 μm thick, with the proviso that the ratios of length:thickness and width:thickness must be at least 3. The pigments in platelet form are excellently suited to producing effect colorations in high molecular weight organic material and in cosmetic products.

What is claimed is: 
     
       1. A diketopyrrolopyrrole organic pigment, which consists of .Iadd.at least .Iaddend.50% by weight of platelets which are from 5 to 50 μm long, 2 to 50 μm wide and 0.01 to 5 μm thick, with the proviso that the ratios of length:thickness and width:thickness must be at least 3. 
     
     
       2. An organic pigment according to claim 1, wherein the ratios of length:thickness and width:thickness must be at least 5. 
     
     
       3. An organic pigment according to claim 1 which is a 1,4-diketopyrrolo[3,4-c]pyrrole pigment. 
     
     
       4. An organic pigment according to claim 1 which is 1,4-diketo-3,6-diphenylpyrrolo-[3,4-c]pyrrole.