JPH0479322B2 - - Google Patents

Description

[Detailed description of the invention]

INDUSTRIAL FIELD OF APPLICATION The present invention relates to a hair dye used for dyeing human hair. More specifically, the present invention can dye human hair to a natural tone of brown to blackish-brown, has excellent hair dyeing properties, sunlight fastness and washing resistance, causes little damage to the hair, and is easy to use. This invention relates to a simple air oxidation (auto-oxidation) one-component hair dye. BACKGROUND ART Various hair dyes have been known from the past. For example (1). Items using vegetable dyes such as henna and chamomile (2). Those using organic metal salts such as bismuth tartrate and iron tannate, (3). Items using metal salts such as copper, aluminum, iron, lead, etc. (4).
Acidic dyes, basic dyes, metal-containing dyes, mordant dyes,
Those using dyes such as disperse dyes or direct dyes,
(Five). Those using pigments such as carbon black,
(6)． Those using oxidative dyes such as paraphenylene diamine and para-aminophenol are already known. However, (1) and (3) have the drawbacks of weak color development and poor dyeability. In case (2), the color tone is unnatural and the metal ions in the raw materials adversely affect the permanent wave treatment later. Although (4) has the advantage of being able to obtain a variety of color tones, it generally has poor dyeability and often fades easily when washed.
(5) Since the pigment is simply physically attached and fixed to the hair, its fastness to rubbing and fastness to washing is very poor. Regarding (6), it has almost the best dyeability, color tone, sunlight fastness, washing fastness, etc. among conventionally known hair dyes, and is the mainstay of currently used hair dyes. However, the hair dye (6) also has some drawbacks. Since hair dyes using oxidative dyes usually undergo an oxidative coloring reaction, it is essential to use an oxidizing agent in combination, and peroxides such as hydrogen peroxide, perborates, and percarbonates are used. For this reason, commercially available hair dyes include one powder formula in which water is added and the inorganic peroxide salts undergo a decomposition reaction, and the other is a powder formula in which water is added and a two-part formula containing hydrogen peroxide is mixed at the time of use. There is a two-drug formula used. In both cases, special equipment for mixing and
An operation that requires uniform mixing is required. Furthermore, this operation must be carried out immediately before hair dyeing, and there is a time constraint in that the hair dyeing must be completed promptly. In addition, all coloring peroxides are highly irritating to the skin, especially to the mucous membranes and eyes, and if they accidentally come into contact with the eyes, there is a risk of serious damage such as blindness. For this reason, we have developed oxidative dyes without using these oxidizing agents to make them usable as hair dyes. Dye compositions that satisfy these requirements have been studied, but all of them have shortcomings and are of low practicality. For example, even if polyhydric phenols such as resorcinol, catechol, and pyrogallol are incorporated into pomades and hair tonics, color development takes several days to several weeks, and the color tone is unnatural and dyeability is poor. Problems to be Solved by the Invention The present inventors have created an ideal hair dye that does not have the drawbacks of the various hair dyes conventionally known as described above, that is, it is easy to use and eliminates gray hair. We have conducted various research in order to obtain a one-part air oxidation (auto-oxidation) hair dye that has sufficient hiding properties, provides natural color tones, is less likely to discolor or fade due to sunlight or washing, and does not use an oxidizing agent. Ta. As a result, by combining specific dyes among known oxidation dyes, color develops in a short time after application with an air oxidation (auto-oxidation) type that is not found in conventional hair dyes.
We have discovered a one-part hair dye that dyes to a natural tone and does not fall off even when washed, and completed the present invention. Means to solve the problem Among the oxidation dyes normally used in hair dyes, those that gradually develop color by themselves due to air oxidation include paraphelenediamine or its salt (hereinafter referred to as
(all known salts also include salts), toluene-2,5-diamine, para-aminophenol, ortho-aminophenol, para-methylaminophenol, 2,4-diaminophenol, pyrogallol, catechol, hydroquinone,
Many of them are known, such as resorcinol, but among these, 2,4-diaminophenol develops color particularly quickly, and develops color in a few minutes in an alkaline solution. Even para-aminophenol, which develops color relatively quickly with other oxidative dyes, is required within several hours. The present inventors attempted to develop an air-oxidized one-part hair dye using 2,4-diaminophenol, but
Hair dyes obtained using this dye alone have a fast color development rate, but the color tone is reddish-purple to reddish-brown, which is unnatural for gray hair dyes. It also has poor dyeability, so it easily comes off when washed. Therefore, we considered improvements to adjust this color tone and improve washing fastness, and tried using oxidation dyes other than 2,4-diaminophenol in combination with 2,4-diaminophenol. discovered a particularly excellent dye composition that has never been seen before. The results are shown next. Experimental method: Prepare the following hair dye, apply a certain amount to gray hair, and leave at room temperature for air oxidation. After 24 hours, wash it with water and observe its dyeability (color depth) and color tone. (Hair dye composition)

[Table] 〓

Claims (1)

[Claims] 1 1,5-dihydroxynaphthalene and 2,4-
An air-oxidized one-component hair dye characterized by containing diaminophenol or a salt thereof.