- Mixed coupled azo pigments
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(1) A mixed coupled azo pigment prepared from: (A) 30% to 70% of two or more diazonium components, at least one derived from a monoaryl amine and (B) an organic coupled component, said pigment containing one or more COOH or .?.SO H.!. .Iadd.SO3 H .Iaddend.groups or esters, amides, alkali metal or alkali earth metal salts thereof or (2) A mixed coupled azo pigment prepared from: (A) 5% to 95% of two or more bis, tris or tetrakis diazonium components, at least one derived from a monoaryl amine and meeting certain specific critria and (B) an organic coupling component, said pigment comprising the same acid or salt groups of pigment (1).
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- Azo pigment compositions and process for their preparation
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This invention is that of an azo pigment composition containing about 1 to 10 percent by weight of a nonionic alkyl polyglycoside dispersing agent. The polyglycosides useful in the invention have the general formulae: wherein: M is an oxygen, sulfur, nitrogen phosphorous or silicon atom; n is an integer from 8 to 18, preferably 8 to 11 and X represents the number average degree of polymerization having a numerical value from about 1 to about 2. These azo pigment compositions are prepared by conducting the azo pigment coupling reaction in the presence of said alkyl polyglycoside. The resulting pigment exhibit superior application properties in water based ink systems.
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