Water-insoluble colorants, process for preparing them and...

Details Water-insoluble colorants, process for preparing them and... Water-insoluble colorants, process for preparing them and...

C - Chemistry, Metallurgy

07

D

6/217, 260/242.5

C07D 491/04 (2006.01) C08K 5/35 (2006.01) C09B 57/00 (2006.01) D06P 1/00 (2006.01)

Patent

CA 1053229

WATER-INSOLUBLE COLORANTS, PROCESS FOR PREPARING THEM AND THEIR USE Abstract of the disclosure: The condensation of barbituric acid, thiobarbituric acid or imino-barbituric acid with 2-hydroxy-3-carboxy-1-naphthal- dehydes or their arylamides in a solvent at 20 to 180°C yields colored compounds which are useful as pigments.

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