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 in which the R1 and R2 radicals are each independently phenylene, naphthylene or pyridylene, each of which may be mono- or polysubstituted by C1-C12-alkyl, C1-C6-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.

Abstract: Multilayer moldings (1) comprising an outer layer (2) comprising a thermoplastic polymer and at least one nanoscale IR absorber (8), and also an inner layer (3) arranged under the outer layer (2) and comprising a thermoplastic polymer. Multilayer molding (1) where the following are used as additional additives: UV absorbers, non-particulate organic IR absorbers, stabilizers, antioxidants, colorants, inorganic salts, pearl-luster pigments, NIR-reflective substances, antifogging agents, or fillers. Multilayer moldings (1) taking the form of a panel or sheeting. Process for the production of a multilayer molding (1) via coextrusion of the outer layer (2) and of the inner layer (3). Use of multilayer moldings in heat management, in agriculture, as window constituent, or as constituent of panels having cavities, twin-web panels, multi-web sandwich panels, or solid panels.

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 in which the R1 and R2 radicals are each independently phenylene, naphthylene or pyridylene, each of which may be mono- or polysubstituted by C1-C12-alkyl, C1-C6-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.