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Vat Dyes

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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.



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Anthracene or Anthraquinone Dyes This large group contains 67 acid and mordant dyes, and includes the alizarines and 82 vat dyes.
Topics for the upcoming conference will include pigments, synthetic binders and thickeners, standardization of colorants, digital printing and instrumental color control, screen engraving and rotary screens and direct printing with vat dyes.
The major product segments analyzed are Dyes (Acid Dyes, Basic Dyes, Direct Dyes, Disperse Dyes, Fiber Reactive Dyes, Vat Dyes, Fluorescent Brighteners, & Others), Inorganic Pigments (Titanium Dioxide, Iron Oxides, & Others), and Organic Pigments.
 
 
 
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