| abstract |
Compositions based on dioxo-pyrrolopyrroles They contain a) at least one dioxo-pyrrolopyrrole corresponding to the formula I: (CF DRAWING IN BOPI) in which R1, R2, R3 and R4 each represent, -H, -Cl, Br, - CH3, -OCH3, -C6 H5 or -CN, and b) from 0.5 to 10% by weight, relative to a), of a mixture of at least 3 symmetrical and unsymmetrical dioxopyrrolopyrroles corresponding to formula I in in which R1, R2, R3 and R4 each represent -H, -Cl, -Br, -CH3, -OCH3, -C6 H5 or a radical -SO3 - X + whose symbol X + represents H +, an equivalent of a metal cation or an ammonium cation, with the proviso that, in this mixture, at least one of the symbols R1, R2, R3 and R4 represents an -SO3 - X + radical. They are remarkably suitable for dyeing macromolecular organic materials. |