Processes for Polyester Fibers with Disperse Dyes

2 Dyeing Processes for Polyester Fibers with Disperse Dyes 

PES fibers are almost exclusively colored with disperse dyes. For some time, dia-zotization dyes were used for dark shades. They are coupled in the fiber with suitable components (e.g., 2-hydroxynaphthoic acid). Although fast colors are obtained, the dyeing process is time-consuming and susceptible to failure, and dyeing reproducibility is poor. Vat dyes are also occasionally used for PES dyeing. Small molecular thioindigo derivatives, in particular, diffuse into PES fibers if they are applied in the thermosol process. 

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