Dyeing fibers at low temperatures has many advantages such as savings in energy and avoiding alterations to the physical properties
of the fibers being dyed or other fibers also present in blends. The problem of low temperature dyeing in synthetic fibers
is that it difficults the dye diffusion into the fiber. In the case of polyamide 6.6 microfibers, by using benzyl alcohol
as an auxiliary dyeing, it was shown that good diffusion was obtained for the dye exhaustion with metal complex dyes at temperatures
more than 30C below the normal dyeing temperature for the dye exhaustion with metal complex dyes. Using thermal analysis
methods these results were shown to be caused by the lowering of the Tg of the fiber when in the presence of benzyl alcohol.