ES427902A1 - PROCEDURE FOR PREPARING A TINTORIAL COMPOSITION FOR KERATINIC FIBERS. - Google Patents

Abstract

Procedure for preparing a dyeing composition for keratin fibers, characterized by the fact that: a) New indamins of formula are prepared: ** (See formula) ** where R and R'each represent a hydrogen atom, a lower alkyl or alkoxy radical or an amino, acylamino or hydroxyl radical and one of them, but only one, is obligatorily an amino, acylamino or hydroxyl radical; R1 and R2 each represent a lower alkyl radical optionally substituted with a hydroxyl, amino, acylamino, carbamyl, alkylsulfonylamino, or arylsulfonylamino moiety; R3, R4, R5, R6, R7 and R8 represent a hydrogen atom or an alkyl or lower alkoxy radical; as well as their acid addition salts and their double zinc salts, it being understood that these compounds can be presented in a tautomeric form of that represented by formula (I); and to this effect a compound of formula is condensed: where Y represents an amino, acylamino or hydroxyl radical; Y1 and Y2 each represent an alkyl radical optionally substituted with a hydroxyl, amino, acylamino, carbamyl, alkylsulfonylamino or arylsulfonylamino moiety; Y3, Y4 and Y5 each represent a hydrogen atom or a lower alkyl or alkoxy radical, on a benzoquinondiimide of the formula: ** (See formula) ** where Z3, Z4, Z5 and Z6 each represent a dehydrogen atom or a lower alkyl or alkoxy radical, however with the proviso that at least two of these radicals do not represent a hydrogen atom; this condensation being carried out in an aqueous medium, optionally in the presence of an acid salt corresponding to the desired indamine salt more soluble in water than this indamine salt or in an inert solvent, optionally in the presence of the acid corresponding to this salt; b) the product obtained in a) is separated, washed in a solvent and dried; c) the product obtained in b) is dissolved in an aqueous or hydroalcoholic solution in an amount of 0.002 to 1% by weight of indamine or deindamine salts; d) other ingredients for dyeing compositions such as wetting agents, dispersing agents, penetrating agents, thickeners and cosmetic resins are introduced into the solution prepared in c) in an amount of 1 to 3% by weight relative to the total weight of the composition ; and everything is adjusted to a pH of 3 to 10 and preferably 6 to 9. (Machine-translation by Google Translate, not legally binding)