JP2759332B2 - Hair dye - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a hair dye which dyes hair without damaging it and has excellent color fastness.

[Prior Art] A hair dye that is conventionally used to dye human hair is called an oxidative hair dye, and is most important in terms of natural color and fastness of dyeing.

This oxidative hair dye comprises a first hair dye and a second hair dye, and the first hair dye is represented by paraphenylenediamine, toluene-2,5-diamine and the like. It is constituted by a combination of a dye precursor and a coupler represented by resorcinol, metaaminophenol, metaphenylenediamine and the like, and the second hair dye comprises an oxidizing agent represented by hydrogen peroxide; Generally, one agent is used by reacting it with a second agent for hair dye under alkaline conditions.

However, this hydrogen peroxide causes a great deal of damage to the hair, the hair becomes squeaky, and this damage to the hair is a serious problem for users.

This damage has also been shown to oxidize the cystine bonds in hair keratin, producing cysteine acid. (H. Zahn, JSCC, 17,687, 1966) Such damage is a major health and beauty problem for hair.

[Problems to be Solved by the Invention] In view of the above problems, the present inventors have conducted intensive studies and as a result, by combining a specific dye precursor and a specific oxidizing agent, the hair was not damaged and dyed. It was found that a hair with excellent color fastness can be obtained in a short time, and the present invention was completed.

[Means for Solving the Problems] That is, the present invention comprises one or more dye precursors consisting of paraphenylenediamine, toluene-2,5-diamine and salts thereof, catechol and pyrogallol. A hair dye comprising a hair dye first agent and a hair dye second agent containing one or more oxidizing agents consisting of iodate and periodate.

Examples of the salts of paraphenylenediamine and toluene-2,5-diamine used in the present invention include sulfates and hydrochlorides.

The compounding amount of one or more of paraphenylenediamine, toluene-2,5-diamine and salts thereof, catechol, pyrogallol used in the present invention is based on the total amount of the first agent.
It is 0.1 to 20% by weight, preferably 0.5 to 5% by weight.

The salts of iodate and periodate used in the present invention are not particularly limited, but potassium salts and sodium salts are preferred.

The compounding amount of iodate and periodate used in the present invention is 0.1 to 20% by weight, preferably 0.5 to 10% by weight of the total amount of the second agent.
% By weight.

The product of the present invention has a higher pH than the system using ordinary hydrogen peroxide.
Is less dependent on dyeing properties and can be used in a wide range of pH, but is preferably about PH 4 to 8 in consideration of hair damage.

In addition, as a hair dyeing method, the first agent is applied to
It is common to leave the hair for 20 minutes, then apply the second agent and leave it for 3 to 20 minutes to dye the hair.

Further, in order to give the first agent a variation in the dyeing color tone, a coupler such as resorcinol, metaaminophenol, metaphenylenediamine and the like which are usually used for an oxidative hair dye may be added. In addition to these, thioglycolic acid, cysteine,
Hypophosphites, antioxidants such as L-ascorbic acid and sequestering agents such as edetates, thickeners, humectants, surfactants,
You may mix oil etc.

The second agent may further include a thickener, a humectant, a surfactant, an oil, and the like.

[Examples] Next, the present invention will be specifically described with reference to Examples and Comparative Examples, but the present invention is not limited thereto. In addition, all compounding amounts are shown by weight%.

Prior to the examples, an effect test and an evaluation method of the present invention will be described.

Each test was carried out by the following methods, but for dyeing and feeling of hair, a test was conducted on 20 panelists,
The evaluation responses that were the most frequent were shown.

(1) Dyeing ○ Uniform gray hair is not noticeable △ Somewhat noticeable gray hair × Notably noticeable white hair (2) Fastness Dyed hair was shampooed 5 times and the color difference before and after shampoo was measured and evaluated.

○ Almost no color change △ Slight color change × Significant color change (3) Feeling of hair The touch was evaluated by touching the dyed hair by hand.

○ Smooth and good finger passing △ Smoothness and finger passing slightly poor × Smoothness and poor finger passing and squeaky Examples 1-4, Comparative Example 1 A hair dye was produced according to the following formulation. In the comparative example, paraphenylenediamine was used as a dye precursor in the first agent, the pH was adjusted to 10 with ammonia, and hydrogen peroxide was used as the oxidizing agent in the second agent.

In the case of the inventive hair dyeing method, gray hair was treated with the first agent for 10 minutes, the second agent was treated for 10 minutes, washed with water and dried. For the comparative product, the first agent and the second agent were mixed at a ratio of 1: 1, applied to gray hair, left for 20 minutes, washed with water and dried in the same manner as the invention product. Table 1 shows the evaluation results.

(First agent) Dye precursor (Table 1) 1.0 Propylene glycol 5.0 Sodium polyoxyethylene lauryl sulfate 10.0 L-ascorbic acid 0.3 edetate 0.1 Purified water Residue (Second agent) Oxidizing agent (Table 1) 5.0 Lauryl Sodium sulfate 5.0 Purified water Residue As is clear from Table 1, the hair dye of the present invention was excellent in all of the effects of dyeing, fastness and hair feel.

Example 5 (First agent) Cetanol 6.0 Liquid paraffin 10.0 Polyoxyethylene cetyl ether 5.0 Sodium lauryl sulfate 2.0 Propylene glycol 5.0 Paraphenylenediamine 3.0 Resorcinol 1.0 Metaaminophenol 0.1 L-ascorbic acid 0.5 edetate 0.1 Perfume 0.1 Purified water Residue (Second agent) Xanthan gum 1.0 Sodium iodate 7.0 Purified water Residue Apply first agent to gray hair, leave for 10 minutes, rinse with water, gently wipe with a towel, apply second agent and leave for 10 minutes After that, it was washed with water and shampooed. The gray hair was dyed firmly yellow-brown, the hair was smooth, the fingers passed smoothly, and no change in color was observed even after one month.

Example 6 (1st agent) Xanthan gum 0.7 propylene glycol 5.0 benzyl alcohol 8.0 N-methylpyrrolidone 15.0 catechol 2.0 resorcinol 0.1 edetate 0.1 purified water residue (2nd agent) Xanthan gum 1.0 potassium periodate 2.0 purified water residue 1st agent Was applied to gray hair, and after standing for 15 minutes, the second agent was overlaid and left for another 15 minutes.

Thereafter, it was washed with water and shampooed. The gray hair was dyed firmly reddish-brown, the hair was smooth and the fingers passed smoothly, and no color change was observed even after one month.

Example 7 (First agent) Cetanol 6.0 Amino-modified silicone 8.0 Polyoxyethylene cetyl ether 2.0 Stearic acid 2.0 Sodium lauryl sulfate 5.0 28% aqueous ammonia 3.5 Toluene-2,5-diamine sulfate 4.0 Sodium sulfite 0.2 Purified water Residue (Second agent) Ingredients) Cetanol 8.0 Liquid paraffin 5.0 Polyoxyethylene lauryl sulfate 6.0 Sodium periodate 5.0 Phenacetin 0.1 Purified water Residue Apply first agent to gray hair, leave for 10 minutes, rinse with water, gently wipe with towel Two agents were applied. Ten
After standing for a minute, it was washed with water and shampooed. The gray hair was dyed firmly black-brown, the hair was smooth, the fingers passed smoothly, and no color change was observed even after one month.

[Effects of the Invention] A hair dye first agent comprising one or more dye precursors consisting of paraphenylenediamine, toluene-2,5-diamine and salts thereof, catechol and pyrogallol, and iodic acid A hair dye consisting of a second agent and a hair dye containing one or more oxidizing agents consisting of a salt and a periodate is a color excellent in dyeing properties and fastness without damaging the hair It gives taste.

Claims (1)

(57) [Claims] (1) paraphenylenediamine, toluene-2,5
A first hair dye containing one or more dye precursors comprising diamines and their salts, catechol and pyrogallol, and one or two oxidants comprising iodate and periodate A hair dye comprising a hair dye second agent comprising at least one seed.