| 摘要 |
The dye precursor-containing composition for hair dyeing contains at least one p-aminophenol derivative compound of the formula (I):in which R1 and R2 each can be H, an alkyl, a hydroxyalkyl, an aminoalkyl, a mono- or dialkylaminoalkyl, an acylaminoalkyl, an aryl- or alkylsulfonylaminoalkyl, a carbamidoalkyl, an acyl, an aryl, an alkylsulfonyl or a carbomoyl group, each alkyl group having from 1 to 4 carbon atoms, or R1 and R2 together are part of a heterocyclic, non-aromatic 5- or 6-membered ring, with or without an oxo group; at least one 5-amino-2-methylphenol derivative compound of the formula (II),in which R is H, a C1- to C4-alkyl, a C2- to C4-hydroxyalkyl group or a C2- to C4- polyhydroxyalkyl group; and at least one m-phenylenediamine derivative compound of the formula (III),in which R1 and R2 each can be H, a C1- to C4-alkyl, a C2- to C4-hydroxyalkyl or a C3- to C4-polyhydroxyalkyl group; R3 stands for H, a C1- to C6-alkyl, a C1- to C4-alkoxy, a C2- to C4-hydroxyalkyl or a C3- to C4-polyhydroxyalkyl group; and R4 stands for H, a C1- to C6-alkyl, a C2- to C4-alkoxy, a C2- to C4-hydroxyalkyl or a C3- to C4-polyhydroxyalkyl group.
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