Direct Black 4
Name:C.I.Direct Black 4,C.I.30245
Molecular Structure: trisazo class
C.I.Direct Black 4,C.I.30245,CAS 2429-83-6,795.76,C35H27N9Na2O7S2,Direct Black R,Direct Black RW
Molecular Formula:C35H27N9Na2O7S2
Molecular Weight: 795.76
CAS Registry Number:2429-83-6
Manufacturing Methods : 4-(4-Aminophenyl)benzenamine double nitriding, first with aniline diazo,In alkaline conditions with 4-Amino-5-hydroxynaphthalene-2,7-disulfonic acid coupling monoazo compound obtained under acidic conditions in the coupling , then and 4-Methylbenzene-1,3-diamine coupling.
Properties and Applications: black. water-soluble ash light black,, and adequate soluble in ethanol (for blue-ray grey) and soluble fiber element, insoluble in other organic solvents. The strong sulfuric acid in the dark for the light blue, red red after diluted sauce to black precipitation; In nitric acid solution for brown (not completely); In strong hydrochloric acid for wine solution (not completely).
| Standard | Acid Resistance | Alkali Resistance | Light Fastness | Soaping | Water | ||
| Fading | Stain | Fading | Stain | ||||
| ISO | 3 | 3 | 3 | 2 | 3 | ||
| AATCC | 3 | 3 | 4 | 3 | 2 | ||
List of Suppliers:
Direct Black R(Colorom SA)
Direct Black RW ( Multicrom SA )
Multicuer Black RW ( Multicrom SA )
Vopsider Black DR(Colorom SA)