Disazo dyes secondary

Secondary Disazo Dyes. There are about 250 dyes of known constitutions in this group. They are made by diazotizing an aminoazo compound, the amino group of which derives from the original coupling component and coupling it to a suitable intermediate. Intrasil Orange YBLH... 

Disazo JMordant Dyes. Examples of disazo dyes are Diamond Alizarine Black SN [3258-74-0] (55) (Cl Mordant Black 25 Cl 21725) and a secondary disazo dye. Diamond Black F [8027-29-0] (56) (Cl Mordant Black 5 Cl 26695). 

Conventional directdyes include monoazo, disazo. trisazo. and tetrakisazo dyes. It is advantageous to subdivide them according to the nature of their chemical structure. Disazo dyes, for example, can be divided according to chemical synthesis principles into primary and secondary. Conventional azo direct dyes further include symmetric urea derivatives, dyes obtained by oxidation of amines, and triazinyl and copper-containing dyes. 

Secondary Disazo Dyes. For the manufacture of secondary disazo dyes of the D— M— K type, a diazotized amine D is coupled to an amine middle component M with a free para position, which in turn is diazotized and coupled to a coupling component K (series coupling). 

In describing the separate dye types it is useful to distinguish between the mono azo and the disazo dyes, and to further break down the disazo dyes into primary and secondary types on the basis of chemicostructural principles. 

Secondary disazo dyes. These dyes can be manufactured by series coupling according to the scheme D —>M—>K (D = diazo component M = middle component K = coupling component), offer much greater possibilities for variation than the primary disazo dyes. This group includes red dyes and, above all, navy blues and blacks. 

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