Bleaching and dyeing; fluid treatment and chemical modification – Measuring – testing – or inspecting dye process
Patent
1991-08-14
1993-07-27
Clingman, A. Lionel
Bleaching and dyeing; fluid treatment and chemical modification
Measuring, testing, or inspecting dye process
8504, 8676, 8680, 8924, D06P 500
Patent
active
052307093
ABSTRACT:
A process for the dyeing of a fibrous article containing fibers of a polyamide polymer with an anionic dye and dyed products made by the process. The process includes immersing the article in a dyeing bath of a liquid solvent for the anionic dye. The liquid solvent and the article are heated to a temperature at least equal to the dyeing transition temperature of the fiber of polyamide polymer. The anionic dye is added to the dyeing bath as a miscible liquid concentrate at a dye addition rate during a controlled dye addition period. At least a portion of the dye is added while the solvent and the article are at a temperature at least equal to the dyeing transition temperature. Stirring of the bath during the dye addition period and while the solvent and article are at a temperature at least equal to the dyeing transition temperature is done to mix the dye concentrate with the solvent in the bath to form a dilute dye solution and to provide a flow of the dilute dye solution relative to the article to cause the dye to be transported to the article. The stirring also provides, on the average, essentially uniform dye transport of the anionic dye to the article. The dye addition rate is adjusted at least while the solvent and article are at a temperature at least equal to the dyeing transition temperature so that the dye addition rate is the primary control over the rate of dye uptake by the article.
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Holfeld Winfried T.
Mancuso Dale E.
Clingman A. Lionel
E. I. Du Pont de Nemours and Company
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