Bleaching and dyeing; fluid treatment and chemical modification – Dyeing involving animal-derived natural fiber material ,... – Hair dyeing
Patent
1988-04-14
1991-04-09
Lieberman, Paul
Bleaching and dyeing; fluid treatment and chemical modification
Dyeing involving animal-derived natural fiber material ,...
Hair dyeing
8405, 8407, 8408, 8431, 8634, 8635, 132204, 424 71, A61K 713
Patent
active
050061275
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an agent for the oxidative dyeing of human and animal hair, which is prepared immediately before application by mixing with an oxidant a dye in creme or gel form containing at least one oxidation dye, and adjusting it to a pH between 5.9 and 6.9. The invention furthermore concerns a method for preparing the agent, and its use.
Until recent times use has been made, for the permanent coloring of human hair, of dyes in gel or creme form containing alkaline oxidation dyes, which are mixed immediately before use with an acid oxidant, e.g., hydrogen peroxide, to form the ready-to-use hair dye that is to be applied to the hair. The coloring is developed in this case by the reaction of certain developer substances with certain coupler substances in the presence of a suitable oxidant. The preparation when ready for application is in this case definitely in the alkaline range, so that the surfaces of the hairs are treated in a manner that is advantageous for the penetration of the oxidation dyes. On the other hand, alkaline preparations also stress the hair, so that, especially in the case of repeated treatment, e.g., repeated redyeing, damage can be done to the hair. Such redyeing, however, especially in the case of light-colored hair, is necessary in order, for example, to match the color of undyed regrowth hair to the previously dyed lengths of hair, and to refresh the color of previously dyed lengths of hair when they have been faded or bleached in the course of time by external effects such as exposure to sunlight, frequent washing, and the like.
Earlier attempts to avoid the effects of alkaline hair dyes especially on the ends of the hair by acidifying the ready-to-apply preparation made from the oxidation dye and the oxidant, have resulted in an unsatisfactory coloring action of the agent. Not until recent times has the applicant developed an agent that is in the weakly acid range (pH between 5.9 and 6.9) in the ready-to-apply state, which produces a good coloring of the hair, while the damage to the hair that has been observed with alkaline hair dyes is largely avoided (patent application P 35 30 270.4). This surprising result is achieved in this hair dye by the addition of small amounts of manganese dioxide which apparently acts as a catalyst of the dyeing action
The invention is addressed to the problem of devising an agent for the oxidative dyeing of hair and a method for its preparation, which, while further improving the dyeing action, will not lead, even when repeatedly used, to the hair damage observed in the use of alkaline hair dyes.
Setting out from a hair dye of the kind described above, this problem is solved according to the invention in that it additionally contains at least one alkali metal salt and/or alkaline earth metal salt, the salt or salts being preferably from the group containing potassium iodide, potassium bichromate, lithium chloride, magnesium acetate, calcium chloride and barium nitrate.
It has been found that the alkali metal salt and/or alkaline earth metal salt in the hair dyeing agent when ready for application leads to the desired catalytic intensification of the coloring action when it is contained in amounts between 0.0001 and 1.00 weight-percent, preferably between 0.0004 and 0.001 weight-percent. In the hair dyeing agent according to the invention, a content of the alkali metal salts or alkaline earth metal salts suffices which is one to two powers of ten less than it is in the above-mentioned newly developed acidified hair dyeing agents acting with manganese dioxide powder as catalytic additive.
In the preparation of the hair dyeing agent according to the invention, either the alkali metal salt or alkaline earth metal salt is mixed with the oxidation dye before the addition of the, as a rule, liquid oxidant, or it can also be added together with or immediately after the oxidation dye is mixed with the oxidant.
When the hair dyeing agent according to the invention is used for dyeing human hair, the procedure is virtually the same as it has been wi
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Lorenz Herbert
Tennigkeit Jurgen
Goldwell GmbH
Lieberman Paul
Skaling Linda D.
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