Лако-красочные материалы — производство

The chemistry of the three most important chemical classes of organic colorants, the azo, carbonyl and phthalocyanine classes, has been dealt with individually in Chapters 3 -5 respectively. In this chapter, the chem­istry of a further five chemical classes which are of some importance for specific applications is discussed. These classes are the polymethines, arylcarbonium ion colorants, dioxazines, sulfur dyes and nitro dyes. A section of this chapter is devoted to each of these, each individual section contains a description of the principal structural features which charac­terise the particular colorant type, together with an outline of the chemis­try of the main synthetic routes. There are many other chemical types of dyes and pigments that do not fall into the categories previously men­tioned, but which are neglected in this text either because they are commercially of little importance or because they have been less exten­sively investigated.