Dyed microfiber textiles
A nonwoven textile substrate formed from microfibers with a polyurethane matrix fully and/or partially impregnated therein, a nonazo disperse dye within microfibers, including the surface, and the matrix. The dyed fibers having an L value of about 35 or less, an ΔE light fastness of about 6 or less when subjected to about 225 kilo-joules, and a long term crock of at least about 1.5.
1. A method for making a nonwoven textile substrate comprising the steps of:
(a) providing a nonwoven textile substrate comprising microfibers;
(b) dyeing the nonwoven textile substrate with a non-azo disperse dye;
(c) scouring the dyed nonwoven textile substrate by a process comprising the steps of:
(i) immersing the dyed nonwoven textile substrate in an aqueous bath comprising at least one alkali material,
(ii) increasing the temperature of the aqueous bath to a first temperature,
(iii) adding a reductive scouring material to the aqueous bath at the first temperature,
(iv) scouring the dyed nonwoven textile substrate in the aqueous bath at the first temperature,
(v) decreasing the temperature of the aqueous bath to a second temperature, and
(vi) rinsing the dyed nonwoven textile substrate.
2. The method of claim 1 wherein the first temperature is about 170 degrees F.
3. The method of claim 1 further comprising the step of agitating the dyed nonwoven textile substrate during said scouring step.
4. The method of claim 1 wherein said nonwoven textile substrate comprises microfibers formed therein and further comprising a matrix at least partially impregnated therein and at least partially surrounding at least a portion of the microfibers, the microfibers including exposed surface area, said microfibers being impregnated with polyurethane.