Overdyeable pigmented polymeric fiber and yarns and articles made therefrom
View Patent ↗Dyed yarns typically have inferior color fastness compared with pigmented yarns. However, dyeing offers a virtually infinite selection of colors, flexibility and more uniformity than constructions of pigmented yarns in residential carpet and other yarn applications, such as apparel. It has been found that relatively small amounts of pigment (10 to 1000 ppm) incorporated into polymeric fibers, and particularly nylon fibers used in carpets, creates lightly pigmented yarns which, when overdyed, are highly uniform and have a higher degree of apparent dye light fastness compared to normal dyed yarns. This effect is observable for both anionic and cationic polyamide polymers, and dyeing of these slightly pigmented yarns can be conducted to produce yarns of almost any color of greater depth than the base yarn.
1. A polymeric lightly pigmented overdyed fiber, consisting of:
a polymer;
color pigments, wherein the color pigments are selected from two of the color families of the trichromatic dye color system, the trichromatic dye color system consisting of blue, yellow and red, the pigmented fiber having off-white color with L* value of about 70 to about 94,
wherein the color pigments consist of a combination of two of Pigment Red 60, Pigment Red 63, Pigment Red 80, Pigment Red 66, Pigment Red 67, Pigment Red 81, Pigment Red 68, Pigment Red 73, Pigment Red 83, Pigment Yellow 65, Pigment Yellow 82, Pigment Yellow 85, Pigment Yellow 87, Pigment Blue 61, Pigment Blue 69, Pigment Blue 74, and Pigment Blue 78;
a dye appropriate for the polymer;
optionally TiO 2 delusterant; and
wherein the total pigment loading level is in the range from about 10 to about 600 ppm by weight of the fiber.
2. The fiber of claim 1 , wherein the polymer is selected from the group consisting of polylactic acid, polyamide, and copolymers and blends thereof.
3. The fiber of claim 2 , wherein the polyamide is nylon.
4. The fiber of claim 3 , wherein the nylon is nylon 6, nylon 66, nylon 4, 6, nylon 6, 12, and blends and copolymers thereof.
5. The fiber of claim 3 , wherein the nylon is cationically dyeable nylon polymers.
6. The fiber of claim 1 , wherein the dye consists of at least one of acid dye, pre-metallized dye, disperse dye, vat dye, cationic dye and reactive dye.
7. The fiber of claim 1 , wherein the color pigments consist of at least two of Pigment Red 63, Pigment Blue 74, Pigment Blue 69 and Pigment Yellow 65.
8. A uniformly overdyed article comprising a substantially homogeneous yarn, the yarn consisting essentially of the fiber of claim 1 .
9. The overdyed article of claim 8 , wherein the overdyed article comprises one of an article of apparel or a carpet.