JPS5835106A - First solution for hair dyeing - Google Patents

Abstract

PURPOSE:The first solution for hair dyeing in which a basic salt of guanidine such as guanidine hydroxide or guanidine carbonate is used as an alkali component to regulate its pH and the consumption of N/10 standard acid solution in specified ranges respectively. CONSTITUTION:The objective first solution for hair dyeing contains as the alkali component at least one selected from guanidine hydroxide, guanidine carbonate, guanidine bicarbonate, guanidine phosphate, guanidine borate and guanidine organic acid salts and so its shows a pH of 8.5-10.5 and consumes N/10 standard acid solution by 5-35ml/g. When ammonia is used as the alkali component, it is preferred because it is volatile. However, attention should be paid its odor and the objective solution may contain less than 0.8wt% NH3, when the consumption of N/10 standard acid solution is 5-35ml/g.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a first agent containing an oxidation dye representing phenylene diamine and generically referring to its analogues, which is used for Shiraga dyeing, Oshiyare dyeing, etc., and hydrogen peroxide. This invention relates to improvements in the first agent in hair dyes that are combined with a second agent containing an oxidizing agent such as the above.

There are various types of hair dyes of this type, such as powder type, liquid type, dyestuff type, and cream type, but the first agent of most of them is alkaline.

Conventionally, ammonia water was mainly used as the alkali. Ammonia is a desirable alkaline agent because it swells the hair and has a mild action, but unfortunately its odor is disliked due to its volatility.

On the other hand, inorganic alkalis such as KO)T and Na2CO3 tend to remain in the hair. Doing so may cause damage, p
It is limited to craftsmen who use it in small quantities only when raising H. recent years()
! I) Using (n)(mono)ethylamine,
Odorless hair dye has begun to be commercially available. However, recently a report was published regarding the sensitization of ethanolamine to the skin of animals, and the Ministry of Health and Welfare designated it as a labeled substance. Regardless of whether the effect on the human body is true or not, it cannot help but be viewed as a problem. Therefore, while searching for other alkaline substances, the present inventors have confirmed that basic salts of guanidine are excellent and hereby propose them.

In the first place, the reason why alkali is added to the first part of hair dye is
[■ The purpose of neutralizing the acidic drugs contained in the first agent, ■ The purpose of neutralizing the acid content of the second agent, which is the source of oxygen (acidic to stabilize hydrogen peroxide) ), ■Generally, when oxidation dyes polymerize and develop color, the reaction rate on the alkaline side is faster, so it is necessary to maintain alkalinity even after mixing the first and second agents. The purpose of adding it is that alkalinity is good for swelling the hair in order to absorb the dye. ].

However, since the hair of healthy people is generally kept on the acidic side, as much alkali as possible must be removed from the hair after treatment.

Figure 1 shows the alkali residual rates of hair treated with various alkalis. After immersing the hair in a N/10 normal concentration solution of each alkali, the water is drained and the hair is then immersed in purified water for washing. (First time) The pH at that time was measured, and the following measurements were made in the same manner several times. As a result, ammonia was the easiest to remove (followed by guania carbonate), while triethanolamine and KOH gave poor results. Ammonia is the most preferred because it volatilizes during dry cent, followed by guanidine.

Guanidine compounds exhibiting basicity (-, guanidine hydroxide (present only as a solution), guanidine carbonate, guanine bicarbonate, guanidine borate, diguaninone phosphate,
Examples include organic acid guanidine, and in the present invention, any of them can be used selectively. For example, guanidine hydroxide has a pH of 13.5, which is higher than NaOH, and diguanidine phosphate has a pH of 8.5, and a combination of these can be used. The feature is that the pH can be adjusted over an extremely wide range. This has a wide range of applications in other cosmetic fields, but when it comes to rabbit meat and hair dyes, if the pH is too high, it will not only have an adverse effect on the quality of the hair, but will also worsen the degree of dyeing. Of course, dyeing takes time on the acidic side.

Regarding alkali, the strength of the alkali (dissociation degree (pH)) and the amount of alkali must be discussed. The required amount of alkali is as described in (1) to (2) above.

In particular, adding too much will actually have an adverse effect on the hair quality. Based on many years of research results, the inventor has determined that the pH of the first agent
is 8.5 to 10.5, and the amount of alkali is 5 to 30 m2 per product, except for the above (2).
It has been found that a range of 1/11 is optimal.

Here, the pH was determined using a 4-fold diluted solution, and the consumption amount of the N/10 acid standard solution was determined by the titration number until the pH reached 7.0.

Deficient Example 1 is a specific example in the case of an alkali containing only guanidine salt.

“Example 1. Name of compounded drug and amount paraphenylenediamine 4.00 (wt%)
1.5 dihydroxynaphthalene 1.25 para-aminone phenylamine 0.65 nido p-phenylene diamine 0.10 propylene/glycol
5.0 Oleic acid 5.
0 Twee 780 26.0 Olive oil 2° Ethyl alcohol
10.0 Phosphoric acid/guanidine 1
7.5 Purified water 28.5 Total 100.0 This blended composition is viscous, pale yellow, has no odor, has a pH of 8.9, and has an N/10 acid standard solution consumption of 8.0 ml/
It was g.

This product is an example of a Noyanpu-type first agent for hair dyeing that dyes hair black by mixing with a second agent containing hydrogen peroxide. ” Next, the present inventor proposed a study on the combined use of ammonia and guanidine. As mentioned above, 7mmoni7 is excellent for hair as an alkali hair dye, but it is difficult to use due to its odor.

However, (-1) The present inventor realized that the odor is a matter of degree, and conducted a questionnaire survey of unspecified people to determine the relationship between the NH3 concentration in the drug and the odor (heated to 3°C). It is clear that there is a limit to the extent to which it is not so disgusting.
Ta. The results are summarized into five ranks and listed in Table 1.

The numbers in Table 1 are based on the number of people surveyed as 100%. As a result, it means that there is no problem even if N) (3 concentration in the cross-agent is used up to 0.8% [7].However, NH
30.8%, ie, N/10 acid consumption of 4.7 ynl/y, cannot be said to be sufficient as a first dye agent. If it's the same.

This is because a considerable amount of alkali is consumed also for the neutralization of the above-mentioned item (2).

For reference, measurement results of known commercially available products are shown in Table 2.

Table 2 According to Table 2, the alkali consumption amount after mixing the first and second agents should be S-A, and although the odor will probably be weakened after mixing, the amount of alkali consumed by the first agent will still be Gives an unpleasant impression when opened or mixed. Of course, the shampoo set is designed with a specialized container for mixing. In addition, the second agent, hydrogen peroxide, is stable on the acidic side (pI (near 3.0)), and the second agent is
In the table, it can be seen that in the case of the cream type, a large amount of acid is added for stabilization, but this inevitably increases the amount of potassium in the second agent.

Comprehensively from the above, the present invention shows that the total alkaline content of the first agent is 5.0 to 35.0 m/111 when titrated to pH 7.0 with N/10 acid standard solution; The idea was to use guanidine as the alkali for the purpose of (2), and to use guanidine as the alkali for the purposes of (2) and (2). As mentioned above, this ammonia should be suppressed to 0.8% or less from the viewpoint of odor. Since the alkalinity of guanidine is stronger than that of ammonia, it preferentially binds to ■. However, this is a conceptual concept, and if there is an excess of guanidine base,
However, as long as the pH does not exceed 10.5, there is no particular negative effect on hair dyeing. N as presence or absence of alkali
)(3(%) can be measured by heating the sample at 100"C.
Since H3 evaporates, it is sufficient to titrate the alkali before and after heating with an N/10 acid standard solution and multiply the difference by 0.17.

Next, Example 2 shows a case where ammonia and guanidine salt are used in combination.

“Example 2 1 Dyeing of paraphenylene diamine etc. N 3.
7 (wt%)2 Sodium edetate
0.23 Propylene glycol 7
54 Polyvinylpyrrolidone 0.15 Vaseline (contains liquid paraffin) 10.06 Setanol 7.07 Stearic acid
2.08 Sodium lauryl sulfate
2゜9 Polyoxyethylene cetyl ether
5.010 Bori -<-)80
2.511 Ammonia water (ao%) -2,012 Diguanidine carbonate 8゜13 Purified water
50.0 total io
o.

1 to 4. 8. Dissolve and mix 11 to 13 to form a water base,
5-7.9-10. Mix and reconcile to make an oil base,
Both were heated to 70° C. and mixed together to form the first creamy hair dye. The pt-r of the 4-fold dilution of this product is 10.0, N/
The consumption amount of 10 acid standard solution is 241111. #, NH3 is 0
, 57. ” In this way, it was possible to raise the pH level with a small amount of alkali without adding inorganic alkali, which is most unsuitable for hair. Regarding ethanolamine, its own toxicity has not been determined, and the pH cannot be adjusted.\1. Since it has properties that are difficult to discard, such as adjustment of H and affinity with the activator, its addition is not prohibited in the present invention.

[Brief explanation of the drawing]

The attached drawing shows a comparison of the amount of hair remaining depending on the type of alkali.The horizontal axis shows the number of washings, and the vertical axis shows the p of the hair wash
This is a diagram of H. 01234 567 Number of washes

Claims (2)

[Claims] (1) One or more types of guanidine hydroxide, guanidine carbonate, guanidine bicarbonate, guanidine phosphate, guanidine boric acid, and organic acid guanidine are blended as the a/L potash content, and the pH is 8.5- A first agent for a hair dye pot, characterized in that the consumption amount of a 10,5, N/, 1θ acid standard solution is 5 to 35 Ml/77. (2) The consumption amount of the N/10 acid standard solution is 5 to 35T.
nll&, which contains 0.8% (weight t) or less of 7 mmoni 7 as ■ out of its alkaline content, as set forth in claim 1. 1
Agent