Bleaching and dyeing; fluid treatment and chemical modification – Dyeing involving animal-derived natural fiber material ,... – Hair dyeing
Patent
1987-07-22
1988-11-01
Wax, Robert A.
Bleaching and dyeing; fluid treatment and chemical modification
Dyeing involving animal-derived natural fiber material ,...
Hair dyeing
8432, 132 7, 424 72, A61K 713
Patent
active
047817240
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
The invention relates to a process for the permanent shaping of white and gray hair which also involves a simultaneous dyeing of the hair.
In the present conventional process, the permanent shaping of hair is effected in two steps. First, the disulfide bridges of the hair keratin are broken by means of the action of a suitable reducing agent. The hair is then put into its new shape and fixed in the new shape by means of treatment with a suitable oxidizing agent accompanied by the reconnection of the broken disulfide bonds.
The composition used for implementing the first reducing process step contains sulfite, bisulfite or certain mercapto compounds, particularly thioglycolic acid and thiolactic acid, also in the form of their ester or alkaline or ammonium salts, as a hair keratin reducing substance which effects shaping.
These compositions are made either acidic (sulfite, bisulfite and mercaptocarboxylic acid ester) or alkali (alkali and ammonium salts of mercaptocarboxylic acids). In the case of alkaline adjusted shaping compositions the required alkalinity is primarily achieved by means of adding ammonia, organic amines, ammonium- or alkali carbonate and ammonium- or alkali hydrocarbonate.
The permanent shaping of human hair is generally carried out in that the washed and towel dried hair is first divided into a plurality of parts and these parts are then wound on curlers. After the curling process, the curlers are thoroughly moistened with the required quantity of permanent shaping composition. The curlers which are used for a permanent wave have a diameter of approximately 5 to 13 millimeters, whereas curlers having a diameter of more than 13 millimeters are required for hair straightening. In hair straightening, one can also dispense with the use of curlers if the hair is stretched by means of combing during the period in which the keratin reducing composition is allowed to act.
The time during which the shaping composition acts on the hair amounts to approximately 5 to 30 minutes in permanent waving as well as permanent straightening, depending on the constitution of the hair and the degree of reshaping which is desired. This period of action can be reduced by means of applying heat, for example, with the use of a heat radiator or a dryer.
After the required period of action of the shaping composition has elapsed, the hair is rinsed with water and treated with a fixing composition, for example, an aqueous solution of hydrogen peroxide or potassium bromate. The period of action of the fixing composition is usually approximately 10 to 15 minutes. Next, the curlers are removed, the hair is treated a second time for some minutes with the fixing composition, if necessary, and is then thoroughly rinsed with water, styled and dried.
Frequently, however, particularly with white or gray hair, a dyeing or tinting is also desired in addition to a shaping of the hair. It is then necessary to carry out a separate dyeing treatment before or after the shaping treatment. This leads to an excessive strain on the hair, since every dyeing or hair shaping constitutes a serious operation on the hair structure.
A reduction of this stressing of the hair can be achieved by means of a simultaneous hair shaping and hair dyeing treatment. Such a combination of the two treatments also saves time.
For this reason, it has already been attempted repeatedly to carry out the shaping and dyeing of hair in one operation. Thus, a process is known from DE-AS Nos. 1 129 261 and GB-PS 876 663, for example, which enables a simultaneous permanent waving and dyeing of hair, including white and gray hair. This process is based on a shaping composition which consists of an aqueous solution of a keratin reducing active ingredient and a suitable basic dyestuff. The dyestuffs used, such as crystal violet, methylene blue, Fuchsin or malachite green, are in the form of the more stable leuco compounds and are only converted into the actual dyestuff during the subsequent oxidative fixing. In addition, it is suggested in the German Patent
REFERENCES:
patent: 3399682 (1968-09-01), Isaji
Hartmann Peter
Kubo Kohei
Wajaroff Theodor
Striker Michael J.
Wax Robert A.
Wella Aktiengesellschaft
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