| 摘要 |
A blue colouring agent with positive regulating properties for electrophotographic recording processes is essentially composed of a compound having the formula (I) and characterized, in the X-ray diffraction pattern, by a strong band at 2 delta DEG (CuK alpha ) 18.47, by three medium bands at 2 delta (CuK alpha ) 18.47, by three medium bands at 2 delta (CuK alpha ) 5.97, 12.01, 13.90 and by three weak wide bands at 2 delta DEG (CuK alpha ) 20.0, 21.7, 22.5, 24.8, 28.2, 30.7, 32.2. The colouring agent is used for producing toners or developers useful for electric photocopying or reproducing documents and for printing electrically, optically or magnetically recorded information or for colour-proofing. |
