Dyes Soluble in Polymers

Polymer-soluble dyes of very different chemical constitutions were developed for the coloration of polystyrene and other transparent plastics. These dyeings 

Apart from C.I. Solvent Yellow 56 other examples are C.I. Solvent Orange 60, 564100 [61969-47-9] and C.I. SolventRed 135, 564120 [71902-17-5]. 

Several anthraquinone dyes are used in dyeing thermoplastics such as polymethacrylate, (modified) polystyrene, and polycarbonate. The dyes also are used in combination with titanium dioxide or other materials to provide body colors for the thermoplastics. Initially compounds with relatively simple structures were used, many of them drawn from stocks of existing intermediates. Since then new products designed to satisfy the specific requirements have become available. 

In contrast to disperse dyes solvent dyes for spin dyeing of polyester fibers are initially soluble in the polymer, thus avoiding the dipersing processes for the application of disperse dyes or pigments. 

Dyes for the coloration of polyacrylonitrile fibers must be soluble in the solvents used for the PAN fiber production process, such as DMF, dimethylacet-amide, and ethylene carbonate. Examples are C.I. Solvent Yellow 147 C.I. Solvent Yellow 163, 58840 [13676-91-0] C.I. SolventRed 202 and C.I Solvent Blue 66, 42799 [58104-34-0] (8) and C.I. Solvent Blue 131. 

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