Vat Dyes


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Related to Vat Dyes: Reactive dyes, Disperse Dyes

Vat Dyes

 

one of the most important groups of dyes. They are insoluble in water. Vat dyes contain carbonyl groups, which are reduced to the enol form Vat Dyes by hydrosulfite, Na2S2O4, during the dyeing process. The resulting soluble leuco compounds of the vat dyes are absorbed by the substrate (for example, cellulose fiber) and converted into the original insoluble vat dyes during subsequent oxidation upon exposure to air. Vat dyes are classified according to chemical structure as polycyclic, indigoid, and thioindigoid. They are manufactured in all colors except bright red. Polycyclic vat dyes are very durable and are widely used in the textile industry for dyeing cellulose fibers; they also serve as pigments.

References in periodicals archive ?
Open width stable continuous dyeing of cotton, linen and their blends through disperse, reactive, vat dyes, etc.
The major product segments analyzed are Acid Dyes, Basic Dyes, Direct Dyes, Disperse Dyes, Reactive Dyes, Sulfur Dyes, Vat Dyes, and Other Dyes.
Some of these dyes are- Acid (Anionic) dyes, Basic (Cationic) dyes, Neutral - Premetalized dyes, sulfur dyes, vat dyes, reactive dyes, pigment dyes, etc.