JPH0460581B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Field of Application] The present invention relates to an auto-oxidizing one-component hair dye. [Prior art and its problems] Conventionally, for example, two-part oxidative hair dyes consisting of a first part whose main ingredient is paraphenylene diamine or paratolylene diamine and a second part whose main ingredient is an oxidizing agent have been widely used. has been done. This type of hair dye can dye hair in various tones and has excellent hair dyeing power and fastness. However, with these hair dyes, it is necessary to uniformly mix the first and second agents immediately before use, which is cumbersome for amateurs who dye their hair by themselves.
Moreover, it has the disadvantage that it is not particularly suitable for people with allergies because it is relatively irritating. In addition, semi-permanent hair dyes that dye hair by solvent dyeing using acidic or basic dyes, metal hair dyes that use metal salts and polyvalent phenols, and temporary hair dyes that use carbon black or pigments. Although these hair dyes are less irritating than the two-component oxidative hair dyes mentioned above and can be used by people with allergies, they are all expensive dyes. The adhesion and fastness cannot be expected, and the color tone is also not satisfactory. On the other hand, oxidative dyes used as oxidative hair dyes are not necessarily automatically oxidized by oxygen in the air, even without the use of a second agent containing an oxidizing agent as the main ingredient.
It is known to produce color. In short, in this case, there is no need to mix the first agent and the second agent during use. However, in the case of conventional oxidation dyes, not only does it take a long time to develop color, but the dyeing power to hair is weak, and the color tone is unnatural, giving third parties a sense of discomfort. [Problems to be solved by the invention and means for solving the problem] In view of the above circumstances, the present inventor has developed an auto-oxidizing hair dye that does not require the use of an oxidizing agent and is capable of dyeing hair darkly and naturally. After conducting various studies to obtain a dye, we found that by using an oxidation dye that is a mixture of a certain paraphenylenediamine derivative and 2,4-diaminophenol, it was possible to dye hair with high dyeing power and a good color tone in a short period of time. The present inventors have discovered that the dye can be dyed, and that it causes very little damage to the hair and very little irritation to the skin, leading to the completion of the present invention. That is, the gist of the present invention is that as an oxidation dye,
2,4-diaminophenol or its salt and the following general formula [] (In the formula, R1 and R2 represent a hydrogen atom, an alkyl group, or a hydroxyalkyl group, but both R1 and R2 are not hydrogen atoms.) Contains a paraphenylenediamine derivative or a salt thereof. An auto-oxidizing one-component hair dye characterized by: The present invention will be explained in detail below. In the general formula [] in the present invention,
The alkyl group or hydroxyalkyl group represented by R1 and R2 preferably has 1 to 3 carbon atoms. Specific examples of paraphenylenediamine derivatives represented by the general formula [] include N-
Methylparaphenylenediamine, N,N-dimethylparaphenylenediamine, N-ethylparaphenylenediamine, N,N-diethylparaphenylenediamine, N-ethyl-β-hydroxyethylparaphenylenediamine, N,N -bishydroxyethylparaphenylenediamine and the like, particularly preferably N-ethyl-β-hydroxyethylparaphenylenediamine and N,N-bishydroxyethylparaphenylenediamine. In addition, these salts usually include sulfates,
Examples include hydrochloride and acetate. In the present invention, it is essential to use the above paraphenylene diamine derivative and 2,4-diaminophenol or a salt thereof in combination. In other words, although this oxidation dye is automatically oxidized even when used alone, when used alone, the color does not develop well in a short period of time, the dyeing power is weak, and the color tone is unnatural.However, when both are used together, It has excellent auto-oxidation properties and can be used to dye hair well. Examples of the salt of 2,4-diaminophenol include sulfate, hydrochloride, acetate, etc., as in the case of paraphenylenediamine derivatives. The ratio of paraphenylenediamine derivative or its salt to 2,4-diaminophenol or its salt is usually 0.1 to 5 times by mole, preferably
It is 0.5 to 2 times the mole. If this usage ratio is too large or too small, a good hair dyeing process due to excellent autooxidation cannot be expected. In the present invention, the amount of oxidation dye added to the hair dye is usually 0.01 to 10% by weight, preferably 0.1 to 6% by weight.
Weight%. In addition, in the present invention, in addition to the above-mentioned oxidation dye, for example, a small amount of nitro dye or acid dye may be blended. The hair dye of the present invention is usually based on an aqueous medium, but in addition to the dye component, there are surfactants such as polyoxyethylene alkyl ether and polyoxyethylene alkylamine fatty acid amide, and humectants such as glycerin and propylene glycol. , oily ingredients such as lanolin, squalane, and liquid paraffin,
Known compounding agents such as stabilizers such as sulfites and ascorbic acid, thickeners such as carboxymethylcellulose, alkali agents such as ammonia and alkanolamines, higher alcohols, fragrances, and propellants are appropriately blended as necessary. be able to. Moreover, the form of hair dye is usually a lotion type or a foam type. When using the auto-oxidizing one-component hair dye of the present invention, the hair dye of the present invention is directly applied to the hair to be dyed without using an oxidizing agent, and then, for example, By leaving it for about 60 minutes, hair can be dyed by the action of oxygen in the air. After the hair dyeing process, hair dyeing can be completed by washing the hair according to a conventional method and then drying the hair. If the dye concentration is low, hair can be dyed by applying it to the hair and leaving it for half a day to two days. [Examples] Next, the present invention will be explained in more detail with reference to Examples, but the present invention is not limited to the description of the following Examples unless it exceeds the gist thereof. Examples 1 to 4 and Comparative Examples 1 to 7 (Formulation of hair dye) Paraphenylene diamine derivative 2,4-diaminophenol As shown in Table 1 Anhydrous sodium sulfite 0.3% by weight Monoethanolamine 0.3% by weight Hydroxyethyl cellulose 2.0 Amount % Make 100% with purified water. Each of the hair dyes prepared above was applied to white goat hair strands, left for 1 hour at room temperature, washed with water and dyed, and the dyed hair was evaluated according to the following criteria. The results are shown in Table 1. (Evaluation criteria) 1... Hardly dyed 2... Stained to pale gray 3... Stained to grayish brown 4... Stained to brown 5... Stained to blackish brown

[Table] From the results in Table 1, good hair dyeing results are obtained when 2,4-diaminophenol is used in combination (Examples 1 to 4), but when it is not used in combination (Comparative Examples 1 to 4) It can be seen that there is no substantial hair dyeing. Furthermore, it can be seen that the example of the present invention is superior to the case where paraphenylenediamine itself is used (Comparative Example 5). On the other hand, it can be seen that the case of using 2,4-diaminophenol alone (Comparative Example 7) cannot be said to be a sufficient hair dyeing treatment. 2-methoxy-paraphenylenediamine and 2,
When 4-diaminophenol was used in combination (Comparative Example 8), the dyeing result was lower than when the paraphenylenediamine derivative specified in the present invention and 2,4-diaminophenol were used together (Examples 1 to 4). It can be seen that the hair effect is inferior. Example 5 (Example of lotion type) N-ethyl-β-hydroxyethylparaphenylenediamine sulfate 0.56% by weight 2,4-diaminophenol sulfate 0.44% by weight Glycerin 5% by weight Ethanol 10% by weight Monoethanolamine 0.5 Weight% Carbopol 940 0.2% by weight Make 100% with purified water. This hair dye was applied to a white goat hair strand, left to stand at room temperature for 1 hour, washed with water and dried, resulting in a good dark brown color to the hair strand. Example 6 (foam type example) N,N-bishydroxyethylparaphenylenediamine sulfate 0.6% by weight 2,4-diaminophenol sulfate 0.4% by weight Stearyl alcohol 1.5% by weight Cetyltrimethylammonium bromide 0.5% by weight Polyoxyethylene (7.5) nonyl phenyl ether 2.0% by weight Methylphenyl polysiloxane 0.5% by weight Glycerin 2.0% by weight Ethanol 0.5% by weight Triethanolamine 0.5% by weight Polyvinylpyrrolidone 2.0% by weight Propellant (Freon 12/Freon 114) 9.0 Weight % The hair dye was made up to 100% with purified water, and then filled into aluminum cans. This was applied to a bunch of white goat hair, left for one hour, washed with water, and dried, resulting in a good gray-black color. [Effects of the Invention] According to the auto-oxidizing one-component hair dye of the present invention, by using a specific paraphenylenediamine derivative and 2,4-diaminophenol as oxidation dyes, Oxidation and color development occur extremely well in a short period of time, making it possible to dye hair in natural dark colors. In addition, it is preferable because it has excellent dyeing power and fastness during hair dyeing treatment, and is less irritating to the scalp.

Claims (1)

[Claims] 1. As an oxidation dye, 2,4-diaminophenol or a salt thereof and the following general formula [] (In the formula, R1 and R2 represent a hydrogen atom, an alkyl group, or a hydroxyalkyl group, but both R1 and R2 are not hydrogen atoms.) Contains a paraphenylenediamine derivative or a salt thereof. An auto-oxidizing single-component hair dye that is characterized by: