Process for preparing vat pigment dyes

Details Process for preparing vat pigment dyes Process for preparing vat pigment dyes

1986-10-10

1989-02-21

Clingman, A. Lionel

Bleaching and dyeing; fluid treatment and chemical modification

Dye or potential dye composition, additive, treatment,...

Sulfur dye or vat dye

8625, 8626, 8632, 86371, 8653, 8661, 8675, C09B 4704, C09C 308, C09D 536

Patent

active

048061280

ABSTRACT:
A process for preparing pigment dyes comprising reducing a colloidal dispersion of an impure dye to form a solution of the leucobase, introducing into this solution a finely divided substrate and, by adding an oxidizing agent, oxidizing the leucobase to form the vat dye, which thereby precipitates and deposits on the substrate.

REFERENCES:
patent: 3761297 (1973-09-01), Figueras

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