Vat Blue 20
Name:C.I.Vat Blue 20,C.I.59800
Molecular Structure: violanthrone
Molecular Formula:C34H16O2
Molecular Weight: 456.49
CAS Registry Number:116-71-2
Manufacturing Methods : commonly known as Violanthrone. (a) Anthracen-9-ol and glycerol in the presence of sulfuric acid condensation, the product 7H-benzo[de]anthracen-7-one with Potassium hydroxide alkali fusion; (b) 4,4′-Dibenzoyl-1’1′-binaphtyl with Aluminium chloride heating; (c) 7H-benzo[de]anthracen-7-one with Potassium hydroxide in glucose and high boiling point inert solvent) in the presence of alkali solution.
Properties and Applications: dark blue purple red to purplish blue. Blue black powder. Etanol and insoluble in water, soluble in 1, 2, 3, 4 – Tetrahydronaphthalene and Xylene in red solution (with red fluorescence), slightly soluble in Acetone, Chloroform, 2 – Chlorophenol, Pyridine and Toluene. Alkaline reduction leuco for dark purple; Acid reduction leuco for wine. In concentrated sulfuric acid for purple black, dilution after purple black precipitation. Used for cotton fiber dyeing, poor levelness. Widely used in dark blue fabric and polyester/cotton khaki dyeing. The leuco used for hosiery dyeing, in yarn-dyed mainly applied to dyeing yarn. Used for cotton fabric direct printing. Can dye viscose, silk and d/cotton goods. Can also be processed into organic pigment.
Standard | Ironing Fastness | Chlorine bleach | Light Fastness | Mercerized | Oxygen bleach | Soaping | |
Fading | Stain | ||||||
ISO | 1 | 4 | 6-7 | 4-5 | 4 | ||
AATCC | 1 | 4-5 | 6-7 | 4 | 4 | 4-5 | 5 |
List of Suppliers:
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