Лако-красочные материалы — производство

The term “pseudo (or synthetic) sulfur dyes” refers to dyes that have application properties similar to those of sulfur dyes but are obtained by the insertion of mer — capto groups or their precursors into the dye precursors or pigments rather than by the classical sulfurization method. These dyes thus have some of the character­istics of sulfur dyes.

The principal chromophores in pseudo sulfur dyes are copper and cobalt phthalocyanines, e. g., in C. I. Sulphur Green 25 (16), and the perylene tetracar — boxylic diimide structure in C. I. Sulphur Red 14 [81209-07-6] and C. I. Solubilised Sulfur Red 11 [61969-41-3] (17). In contrast to the sulfur dye made from Cu phthalocyanine, the cobalt derivative can be applied with dithionite.

Some special reactive dyes that can be applied by sulfur-dye methods and can also be combined with sulfur dyes represent a special case. An example is C. I. Solubilised Sulfur Red 11. These dyes contain no thiolate groups at all.