Black coloring for fibers

Abstract

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 ##STR00001##
in which the R.sup.1 and R.sup.2 radicals are each independently phenylene, naphthylene or pyridylene, each of which may be mono- or polysubstituted by C.sub.1-C.sub.12-alkyl, C.sub.1-C.sub.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.

Claims

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 ##STR00007## in which the R.sup.1 and R.sup.2 radicals are each independently phenylene, naphthylene or pyridylene, each of which may be mono- or polysubstituted by C.sub.1-C.sub.12-alkyl, C.sub.1-C.sub.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.

Description

EXAMPLES

Production of the Fibers

(1) A masterbatch in PBT, comprising 40% by weight of IR-transparent colorant based on the total amount of PBT and IR-transparent colorant, was prepared. This masterbatch was used in a ratio of 1:10 to produce a PET fiber. The fibers were produced by spinning extrusion and then air-textured. The spectroscopic measurements (reflectance measurements) were carried out on a wound fiber bundle (Ulbricht sphere 300-2500 nm).

(2) The following IR-transparent colorants were used:

(3) ##STR00003## ##STR00004## ##STR00005## ##STR00006##

(4) The colorants F1 to F9 were prepared as specified in WO 2005/078023 A2.

Example 1

Reflectance of NIR Radiation of a Black Fiber Bundle in the Wavelength Range from 760 to 1500 nm in Front of a White Surface

(5) The reflectance was higher than 70% for all colorants F1 to F9.

(6) In comparison, the reflectance for fibers into which carbon black had been incorporated under the same conditions as the colorants within the above-specified wavelength range was less than 5%.

Example 2

Reflectance of NIR Radiation of a Black Textile for Automobile Interiors in the Wavelength Range from 760 to 1500 nm in Front of a White Surface

(7) The reflectance was higher than 60% for all colorants F1 to F9.

(8) In comparison, the reflectance for fibers into which carbon black had been incorporated under the same conditions as the colorants within the above-specified wavelength range was less than 5%.

Example 3

Reflectance of NIR Radiation of a Gray Textile for Automobile Interiors in the Wavelength Range from 760 to 1500 nm in Front of a White Surface

(9) The reflectance was higher than 60% for all colorants F1 to F9.

(10) In comparison, the reflectance for fibers into which carbon black had been incorporated under the same conditions as the colorants within the above-specified wavelength range was less than 30%.