Black coloring for fibers
Fibers, especially black, brown or gray fibers, comprising IR-transparent colorants. IR-transparent colorants may be di-, tri- or polychromatic dyes or pigments, especially perylene pigments. The fibers may comprise perylene pigments which comprise one of the isomers of the formula Ia or Ib in which the R 1 and R 2 radicals are each independently phenylene, naphthylene or pyridylene, each of which may be mono- or polysubstituted by C 1 -C 12 -alkyl, C 1 -C 6 -alkoxy, hydroxy and/or halogen, or a mixture of the two isomers. Useful fiber materials include plastics or glass. The fibers find use, among other uses, in heat management or for production of textiles or fabrics.
1. A polyester fiber, comprising
from 0.5 to 10% by weight an IR-transparent colorant based on the total weight of fiber and colorant, the IR-transparent colorant is a perylene pigment and comprises one of the isomers of the formula Ia or Ib
in which the R 1 and R 2 radicals are each independently phenylene, naphthylene or pyridylene, each of which may be mono- or polysubstituted by C 1 -C 12 -alkyl, C 1 -C 6 -alkoxy, hydroxyl and/or halogen, or a mixture of the two isomers; and
2 to 20% by weight of titanium dioxide as an additive based on the total weight of the fiber and the additive, wherein the fiber has a reflectance of at least 60.
2. The fiber according to claim 1 , which is a black, brown or gray fiber.
3. A process for producing a fiber according to claim 1 , which comprises coloring a fiber with the aid of an IR-transparent colorant.
4. A material comprising a fiber according to claim 1 .
5. The material according to claim 4 , which, behind the fiber, has a light or white surface.
6. The material according to claim 4 , wherein the material is a textile or a fabric.
7. The material according to claim 6 , wherein the textile or fabric is a sunblind, an awning, a roller blind, a curtain, a geotextile, a mulch film, a tent, a textile and a fabric for outdoor use, clothing or a seat cover.