A series of diarylide yellow pigments based on selected p-phenylenediamine derivatives as tetrazo components have been synthesised and their application performance assessed. Among the most interesting products were a range of new metal-salt disazo pigments synthesised from 2,5-phenylenediamine-1,6-disulphonic acid, which is of potential interest as an alternative to 3,3-dichlorobenzidine, as it is likely to be of low toxicity, non-carcinogenic, non-mutagenic and potentially low cost. The synthesis of disazo metal-salt pigments is in this case complicated by the requirement for a two-stage diazotisation/azo coupling process, although this offers a versatility advantage with an easy route to unsymmetrical derivatives. The colouristic properties, overpaint fastness, lightfastness and heat stability of the metal-salt pigments were comparable in some cases, inferior in others, to commercial dichlorobenzidine-based pigments selected as standards. Lightfastness was, in some cases, comparable in full strength although inferior in tint; solvent resistance was superior to that of the commercial pigments, as expected for metal-salt type pigments.

一系列基于选定p的二芳基黄色颜料已经合成了作为四唑组分的-苯二胺衍生物，并评估了其应用性能。在最有趣的产品中，有一系列由2,5-苯二胺-1,6-二磺酸合成的新型金属盐二偶氮颜料，作为3,3-二氯联苯胺的替代品，它具有潜在的吸引力。具有低毒性，无致癌性，无诱变和潜在的低成本。在这种情况下，对二偶氮金属盐颜料的合成由于需要两步重氮化/偶氮偶合工艺而变得复杂，尽管这提供了通用性优势，并且易于获得不对称衍生物。在某些情况下，金属盐颜料的色泽性，涂料坚牢度，耐光性和热稳定性可比拟，在其他情况下则较差，选用市售的基于二氯联苯胺的颜料作为标准。在某些情况下，尽管坚牢度较差，但耐晒牢度在全强度上是可比的；如金属盐型颜料所预期的，耐溶剂性优于市售颜料。