Bleaching and dyeing; fluid treatment and chemical modification – Dyeing involving animal-derived natural fiber material ,... – Hair dyeing
Patent
1987-04-22
1988-10-11
Lieberman, Paul
Bleaching and dyeing; fluid treatment and chemical modification
Dyeing involving animal-derived natural fiber material ,...
Hair dyeing
8405, 8628, 132203, 132208, 25218621, 424 71, A61K 713, A61K 709
Patent
active
047768568
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a process for the oxidized dyeing of human or animal hair, in which a hair dyeing agent is prepared immediately before use from at least one oxidation dye and one oxidizing agent, applied to the hair that is to be dyed, and made to act for a given period of time, whereupon the hair dyeing agent is washed out, as well as a hair dyeing agent for performing the process.
For the lasting dyeing of human hair, alkaline oxidation dyes in paste form are used, which are mixed immediately before use with an acid oxidizing agent, e.g., hydrogen peroxide, to form the ready-to-use hair dyeing preparation that is to be applied to the hair being dyed. The color is produced by the reaction of certain developer substances with certain coupling substances in the presence of a suitable oxidizing agent. The ready-to-use preparation in this case is definitely in the alkaline range, so that the surfaces of the hairs to be dyed are opened up advantageously for the penetration of the oxidation dyes. On the other hand, alkaline preparations also are stressful to the hair, so that, especially when they are used repeatedly, e.g., for repeated redyeing, they can harm the hair. Such redyeing, however, is necessary, especially in the case of light-colored hair, in order, for example, to match the undyed regrowth to the color of the previously dyed hair lengths, or to refresh the color of the previously dyed hair lengths if the original color has faded in the course of time due to other influences, such as sunshine, frequent washing and the like.
Attempts to prevent the harmful effects, especially at the hair ends, of alkaline hair dyeing agents by acidifying the preparations ready-made from the oxidation dye and the oxidizing agent have led to insufficient coloring of the hair and therefore have not been further pursued.
The invention is addressed to the problem of devising a process for the oxidizing dyeing of hair as well as the hair dyeing agent necessary for the purpose, which, even when frequently used, will not result in the hair damage described above.
Setting out from a process of the kind described above, this object is achieved according to the invention by the use of a hair dyeing agent prepared in powder form from an oxidation dye and oxidizing agents with the use of manganese dioxide, and adjusted to a weakly acid pH in the range from 5.9 to 6.9. It has been found that, when such a hair dyeing agent with a weakly acid adjustment is used in the company of manganese dioxide, outstandingly persistent dyeing of human hair in bright shades is possible, unless darker hair is to be redyed to a lighter shade. The successful dyeing action, in comparison to earlier experiments with acid hair dyeing agents, is attributed to the catalytic action of the manganese dioxide contained in the hair dyeing agent. Furthermore it was found that the hair damage which was to be attributed to the alkalinity of the previously used hair dyeing agents is completely avoided.
From the above information it appears that, for the lightening or brightening of darker hair, recourse must be had to the known alkaline hair dyeing agents. Since damage to the hair is produced by such alkaline hair dyeing agents as a rule only after repeated redyeing, such damage can be prevented if, in the redyeing of hair dyed to a lighter color, which in the natural state is darker, the procedure is first to employ a known hair dyeing agent of alkaline adjustment on the darker regrowth close to the scalp, but in the adjoining, previously dyed hair lengths to apply the weakly acid hair dyeing agent, and to wash both the alkaline and the weakly acid hair dyeing agents out of the treated hair after a sufficient time of action.
Especially problematical in regard to hair damage is a combined permanent wave and hair dyeing treatment. In a process for the waving and oxidation dyeing of hair in which first a permanent-wave preparation is made to act for a given period of time on the hair washed and wound on curlers, and then washed out, and then the still-woun
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Lorenz Herbert
Tennigkeit Jurgen
Goldwell GmbH Chemische Fabrik H. E. Dotter
Lieberman Paul
Skaling Linda D.
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