Process for granulating azo compounds and granules obtained

Process for granulating an azo compound of general formula (I) below:

• in which:
• the radicals R1, R2, R3 and R4, identical or different, are chosen independently of one another from:
• a linear or branched alkyl group, optionally substituted by a hydroxy or alkoxy group or by a halogen atom;
• a cycloalkyl group, optionally substituted by a hydroxy or alkoxy group or by a halogen atom;
• an aryl group, optionally substituted by a hydroxy, alkyl or alkoxy group or by a halogen atom;
• an aralkyl group, optionally substituted by one or more alkyl, alkoxy or hydroxy group(s) or by one or more halogen atom(s);
• or
• at least one of the combinations of R1 with R2 and/or of R3 with R4 forms, with the carbon atom to which it is (or they are) connected, a cycloalkyl radical or a C(O) group;
• the radicals R5 and R6, identical or different, are chosen independently of one another from the CN or NH2 groups;
• said process comprising the following steps:
• a) a granulation step by stirring an aqueous suspension of said azo compound, in the presence of an organic binder;
• b) an optional step of recovering the granules obtained in step a), preferably by filtration;
• and
• c) an optional step of drying the granules recovered in step b).