| abstract |
Use of an azo pigment of the formula (1) as colorants in electrophotographic toners and developers, powders and powder coatings and in electret materials, characterized in that the azo pigment has a specific surface area of the pigment powder of more than 70 m 2 / g and that the azo pigment particles have an average length-to-width ratio of smaller than 2.8: 1 and have an average particle size d 50 of less than 130 nm. |