US PATENT SUBCLASS 8 / 651
.~.~ Soluble leuco ester salts

Current as of: June, 1999
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8 /   HD   BLEACHING AND DYEING; FLUID TREATMENT AND CHEMICAL MODIFICATION OF TEXTILES AND FIBERS

636  DF  DYE OR POTENTIAL DYE COMPOSITION, ADDITIVE, TREATMENT, PROCESS, PRODUCT, OR ANCILLARY DYE OPERATION {12}
650  DF  .~ Sulfur dye or vat dye {3}
651.~.~ Soluble leuco ester salts

DEFINITION

Classification: 8/651

Soluble leuco ester salts:

(under subclass 650) Subject matter employing derivatives of vat dyes, in the form of soluble ester salts or their leuco compounds.

(1) Note. For example, a quinionic vat dye reduced to the hydroquinone form (OH) and esterified with a sulfoated aromatic compound to solubilize the insoluble vat dye.