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US 8,034,174 B2Granted
Diarylide yellow pigments
AssigneeSun Chemical Corporation
InventorsRussell Schwartz, Ulrik Cassias, Palle Chris Nielsen
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Abstract
A diarylide yellow pigment formed by a coupling reaction of a benzidine and a mixture comprising 4-chloro-2,5-dimethoxy-acetoacetanilide and 2,4-dimethyl-acetoacetanilide. The diarylide yellow pigment has a desirable reddish shade than C.I. Pigment Yellow 83, exists in a solid solution, and contains fewer aromatic amine impurities.
Claims13
A diarylide yellow pigment produced from a process comprising:
- coupling tetrazotized 3,3′-dichlorobenzidine and a mixture comprising 25-90% by weight of 4-chloro-2,5-dimethoxy-acetoacetanilide and 75-10% by weight of 2,4-dimethyl-acetoacetanilide;
- where the resulting diarylide yellow pigment is a solid solution.
Dependencies are inferred from the claim text.