Oxidation dye composition containing at least one double base in combination with at least one single base and dyeing process making use of it

  • US 5,137,538 A
  • Filed: 08/19/1991
  • Issued: 08/11/1992
  • Est. Priority Date: 09/08/1988
  • Status: Expired due to Term
First Claim
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1. A dye composition for dyeing keratinous fibers comprising:

  • (a) a single base dye precursor of formula (I);

    ##STR4## and salts thereof;

    (b) at least one double base dye precursors selected from the group consisting of N,N'"'"'-diphenylalkylenediamines of the formula (II);

    ##STR5## and acid addition salts thereof; and

    (c) a suitable carrier, wherein;

    the concentration of said single and double base dye precursors is sufficient for dyeing said keratinous fibers;

    said single and double base dye precursors are selected such that the difference between the value of the intensity of the color on dyed bleached hair (VB) and the value of the intensity on dyed permanent-waved bleached hair (VBP) is 0±

    0.5 and value is determined using the Munsell System for specifying color;

    the molar ratio of the single base dye precursors to double base dye precursors is between 3 and 10;

    Z1 and Z2, which are identical or different, denote hydroxyl or NHR9 groups, in which R9 denotes a hydrogen atom or an alkyl radical;

    R6 and R7, which are identical or different, denote hydrogen atoms, halogen atoms or (C1 -C4) alkyl groups;

    R8 denotes a hydrogen atom, a (C1 -C4) alkyl, hydroxy (C2 -C4) alkyl, an aminoalkyl group or an aminoalkyl group in which the amino residue is substituted by a (C1 -C4) alkyl group; and

    Y denotes a radical selected from the group consisting of the following radicals;

    -CH2)n, -CH2)n'"'"' O-CH2)n'"'"', -CH2)n'"'"' CHOH-CH2)n'"'"' and ##STR6## in which n is an integer between 0 and 8, andn'"'"' is an integer between 0 and 4 .

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