Commercially Available Monoazo Yellow and Orange Pigments

4 Commercially Available Monoazo Yellow and Orange Pigments 

The oldest monoazo yellow pigment is Pigment Yellow 1, which continues to be produced and shipped on a large scale. Its discovery and introduction in 1910 was followed by the development of a variety of related pigments of this type, not all of which have turned into a commercial success. A few, such as pyrazolone-based Pigment Yellow 10, are still produced by some regional companies and are targeted for smaller niche applications. 

97 11767 och3 so2nh-Cd [5 och3 OCH3 Cl och3 yellow 

Acetoacetic-o-anisidide, a frequently used coupling component for monoazo yellow pigments, is generally considered one of the most important intermediates for the production of monoazo and disazo yellow pigments worldwide. 

The currently available salt type monoazo yellow pigments are mostly based on 2-nitroaniline-4-sulfonic acid as a diazo component and are mostly sold as calcium lakes (Table 13). 

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Commercially Available Monoazo Yellow and Orange Pigments 225 Pigment Yellow 73... 

A selection of representative chemical structures from the vast range of reactive dyes now available commercially is illustrated in Figure 8.5. Reactive dyes may be prepared, in principle, from any of the chemical classes of colorant by attaching a fibre-reactive group to an appropriate molecule. In common with most application classes of textile dyes and pigments, most reactive dyes belong to the azo chemical class, especially in the yellow, orange and red shade areas. Examples are typified by the structurally related red monoazo reactive dyes, the dichlorotriazine 8.28a, Cl Reactive Red 1, the... 

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