Bleaching and dyeing; fluid treatment and chemical modification – Process of printing permanently on substrate – other than... – Vat dye or sulfur dye – e.g. – quinonic or indigoid reducible...
Patent
1993-08-09
1994-09-27
Lieberman, Paul
Bleaching and dyeing; fluid treatment and chemical modification
Process of printing permanently on substrate, other than...
Vat dye or sulfur dye, e.g., quinonic or indigoid reducible...
8625, 8651, 8653, 585266, C09B 6728, C09B 904, C09B 700
Patent
active
053504259
ABSTRACT:
A process for reducing vat dyes, such as indigo, into their leuco form by placing a metal, such as aluminum, in water in the presence of a reduction facilitator to form a first solution after which a vat dye having the general structure O.dbd.C(--C.dbd.C--).sub.N C.dbd.O where N=1, 2 or 4 is mixed with the first solution to form a dye solution where substantially all of the vat dye is reduced to its soluble leuco form having the general structure HO--C.dbd.(C--C).sub.N .dbd.C--OH. The process includes dyeing fabric in the dye solution. the reduction facilitator may be a base, for example that produced hydroxide ions in water, and the first solution as well as the dye solution can be a basic solution. The soluble leuco can be isolated from the dye solution and dissolved in a non-aqueous solution. Prior to mixing the vat dye in water, it may first be dissolved in a solvent miscible with water.
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Dusheck Caroline L.
Lieberman Paul
Martin Timothy J.
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