Patent Interference No. 103,548
HO
CH2
CH2 (I)
HO N
R
in which R represents a hydrogen atom or a C1-C4 alkyl group, or an
acid addition salt thereof in a medium suitable for dyeing is applied to these
fibres, this composition is kept in contact with the fibres for a period sufficient to
develop a colour with the aid of a chemical oxidizing system, the chemical
oxidising system consisting of:
(i)iodide ions and hydrogen peroxide, the composition (A) additionally
containing, in this case, either (a) iodide ions or (b) hydrogen
peroxide and the application of the composition (A) being preceded or
followed by the application of a composition (B) which contains, in a medium
appropriate for dyeing, either:
(a) hydrogen peroxide at a pH of between 2 and 12 when the composition
(A) contains iodide ions, or
(b) iodide ions at a pH of between 3 and 11, when the composition (A)
contains hydrogen peroxide;
(ii)salt of a metal of groups 3 to 8 of the periodic table, the metal
salt being applied in a separate step by means of a composition (B)
containing the salt in a medium appropriate for dyeing;
(iii) a quinone derivative comprising an ortho- or para- benzoquinone, an ortho-
or para-benzoquinone monoimine or diimine, a 1,2- or 1,4-naphthoquinone,
an ortho- or para-benzoquinone sulphonimide, and ",T-alkylenebis-1,4-
benzoquinone or a 1,2- or 1,4-naphthoquinone monoimine or diimine, the
5,6-dihydroxyindoline of formula (I) and the quinone derivative being
selected such that the difference in redox potential )E between the redox
potential E1 of the 5,6-dihydroxyindoline of formula (I) determined at pH 7 in
a phosphate medium on a vitreous carbon electrode by means of
voltammetry and the redox potential Eq of the quinone derivative determined
at pH 7 in a phosphate medium by polarography on a mercury electrode
relative to the saturated calomel electrode such that:
)E = Ei - Eq # 320 millivolts;
the composition (B) being applied before or after the application of the
composition (A) and wherein the fibers are then rinsed.
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Last modified: November 3, 2007