Direct Black 77
Name:C.I.Direct Black 77,C.I.35860
Molecular Structure: Multi-azo class
C.I.Direct Black 77,C.I.35860,CAS 6409-85-4,1143.94,C42H25N11Na4O15S4
Molecular Formula:C42H25N11Na4O15S4
Molecular Weight: 1143.94
CAS Registry Number:6409-85-4
Manufacturing Methods : 2-Aminobenzene-1,4-disulfonic acid diazo, and Naphthalen-1-amine coupling, again diazo, and 8-Aminonaphthalene-2-sulfonic acid coupling, product to diazo, in alkaline conditions and 4-Amino-5-hydroxynaphthalene-1-sulfonic acid coupling, and then diazo, and 4-Nitrobenzene-1,3-diamine coupling.
Properties and Applications: green light grey. water-soluble ash light black, soluble in ethanol. The strong sulfuric acid for gray light black, grey brown for purple diluted. Dye with strong hydrochloric acid solution for violet black, precipitation; Add thick sodium hydroxide solution for Gray light black, precipitation.
| Standard | Acid Resistance | Alkali Resistance | Light Fastness | Soaping | Water | ||
| Fading | Stain | Fading | Stain | ||||
| ISO | 5 | 4 | 5 | 2 | 2-3 | ||
List of Suppliers:
[…] C.I.Direct Black 77 […]