dye|World dye variety

Name:C.I.Direct Brown 31,C.I.35660

Molecular Structure: Multi-azo class

C.I.Direct Brown 31,C.I.35660,CAS 2429-81-4,1118.95,C46H30N10Na4O13S3,Brown B,Direct Brown BC,Brown BT

Molecular Formula:C₄₆H₃₀N₁₀Na₄O₁₃S₃

Molecular Weight: 1118.95

CAS Registry Number:2429-81-4

Manufacturing Methods : 4-(4-Aminophenyl)benzenamine double nitriding, first coupled with 2-Hydroxybenzoic acid, and then and 3-Amino-5-hydroxynaphthalene-2,7-disulfonic acid diazo, in acid conditions and 4-Methylbenzene-1,3-diamine coupled to a product matches, then hydrolysis benzene sulfonic acid ester base, its products as coupling components again with diazo of 4-Aminonaphthalene-1-sulfonic acid matches.

Properties and Applications:  red light brown. Soluble in water for yellow brown, and adequate soluble in ethanol and soluble fiber element, insoluble in other organic solvents. The strong sulfuric acid for blue-ray purple or brown and violet black, yellow to red light brown after diluted precipitation; In the nitric acid for brown; In 10% of sodium hydroxide solution for blue-ray red. The dye solution to join strong hydrochloric acid for red orange brown; Add thick sodium hydroxide solution have orange brown precipitation.

List of Suppliers:

ABCOL Brown B.I.B.( Abbey Color Inc. )

ACDI Brown B 125%(Aakash Chemicals & Dyestuffs Inc)

Direct Brown BC(Classic Dyestuffs Inc)

Pontamine Brown BT(Classic Dyestuffs Inc)

Trisulphone Brown B( ellenic Dyeworks

SA)