Acid donor process for dyeing polyamide fibers and textiles

Details Acid donor process for dyeing polyamide fibers and textiles Acid donor process for dyeing polyamide fibers and textiles

1998-03-12

1999-10-05

Diamond, Alan

Bleaching and dyeing; fluid treatment and chemical modification

Organic additive for dye composition, dye composition...

Carboxylic acid esters, cyanates, isocyanates, or sulfur...

8405, 8436, 8404, 8552, 8580, 8594, 8662, 8673, 8674, 8676, 8680, 8685, C09B 6700

Patent

active

059616695

ABSTRACT:
A process for dying materials containing natural or synthetic polyamides is disclosed. The process includes immersing the materials to be dyed in a dye bath containing an acid dye. The pH of the dye bath is initially at a level that substantially inhibits the dye from being absorbed by the polymer. In accordance with the present invention, however, an acid producing composition is added to the bath which gradually reduces the pH of the bath and allows for uniform diffusion of the dye into the polymer. The acid producing composition of the present invention is a maleate ester, which, in one embodiment, is the reaction product of maleic acid or maleic anhydride and a glycol.

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