JP3262947B2 - Permanent wave agent - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a permanent waving agent, which has a very high waving effect on hair, has low irritation to the skin, and can be used safely without causing rough hands. It is to provide a permanent wave agent.

[0002]

2. Description of the Related Art As a permanent wave, a "two-bath cold wave agent" for waving hair at room temperature.
Is mainly used. At present, the "two-bath cold wave agent" includes a first agent containing thioglycolic acid or a salt thereof (reducing agent), a bromate and the like (oxidizing agent).
Those comprising a second agent containing are commonly used. In order to form a permanent wave on the hair, the elasticity and the resilience of the hair are utilized, and the resilience of the hair is first removed temporarily by cutting the side chains of the protein. The principle of a permanent wave is to give plasticity to the hair, to curl it into an arbitrary shape, and then to rejoin the side chains again at a new position to give the hair a restoring force to form a wave. Therefore, in the case of using the above-mentioned "two-bath cold wave agent", when the hair is wound around a rod and the first agent is acted on, the cystine bond (-) of the hair is reduced.
(S—S—bond) is cleaved by the reducing agent, then washed with water, and then the second agent is applied to the hair treated with the first agent.
The cleaved cystine bond is recombined by the oxidizing agent, and is restored to the original state of natural hair in a wave form, thus completing the permanent wave.

[0003] Since the permanent wave agent contains a reducing agent, an oxidizing agent and an alkali, it is necessary to pay close attention to its handling from the viewpoint of safety. In Japan, the Ministry of Health and Welfare has enacted “Permanent Wave Agent Standards”, which were regulated as quasi-drugs. According to conventional standards, in a two-bath cold wave preparation containing thioglycolic acid or a salt thereof as a main component, the content of thioglycolic acid (salt) as a main component of the first preparation is 2.0 to 7.0%. The range was regulated.

[0004]

In order to impart a certain wave effect to hair, it is required to increase the amount of thioglycolic acid or its salt (reducing agent) in the first agent. However, a permanent waving agent containing thioglycolic acid or a salt thereof in an amount of 5% by weight or more generally has a strong wave effect, but on the other hand, has a strong irritating effect on the scalp or hands of a practitioner, and poses a problem in safety. There was a problem that would arise.

On the other hand, in February 1993, the "Permanent Wave Agent Standard" was abolished, and the "Permanent Wave Agent Manufacturing (Import) Approval Standard" was enacted. The upper limit of the concentration was increased from 7% by weight to 11% by weight.
With this establishment, the industry has made it possible to develop permanent waving agents having a greater waving effect on hair than ever before, and research is being conducted in various fields. However,
Skin irritation and rough hand giving to the practitioner of permanent wave agent with high thioglycolic acid concentration becomes a more serious problem than ever before, and the solution to this skin irritation problem,
It was an urgent task in the industry.

[0006]

According to the present invention, 5% by weight or more of thioglycolic acid or a salt thereof, 0.5 to 5% by weight of isopropanolamine, and 0.1 to 5% by weight of trimethylglycine are used. The present invention solves all of the above-mentioned problems by providing a permanent wave agent which is contained as an essential component and has a pH of 8.5 or more.

[0007]

The constitution of the permanent wave agent according to the present invention will be described below in detail. The permanent wave agent according to the present invention is thioglycolic acid or a salt thereof,
Isopropanolamines and trimethylglycine are contained as essential components.

[0008] Thioglycolic acid or a salt thereof, which is one of the essential components, acts as a reducing agent and cleaves cystine bonds (-SS- bonds) in the hair to make the hair soft and plastic. Thioglycolic acid is a very strong acid, which causes inflammation if it adheres to the skin.
Preferably, it is used in the form of a salt neutralized with an alkali. Specifically, ammonium thioglycolate, monoethanolamine thioglycolate and the like are preferably used, but calcium salts and sodium salts can also be used.

In the present invention, the thioglycolic acid or a salt thereof is incorporated in an amount of 5% by weight or more. The reason for this is
If the content of thioglycolic acid or salts thereof is less than 5% by weight, the effect of forming a wave on hair is not sufficient, and the permanent wave agent having a good wave power aimed at by the present invention cannot be obtained. . The upper limit of thioglycolic acid or salts thereof may be within the established standards.

In the present invention, isopropanolamines are used as the second essential component. As the isopropanolamines, monoisopropanolamine,
Diisopropanolamine, triisopropanolamine and the like are preferably used, but are not particularly limited. Isopropanolamines make the system containing thioglycolic acid or a salt thereof as a main component alkaline and improve the reducing action on hair. This isopropanolamine is blended at 0.5 to 5% by weight. The reason for this is that if the amount of isopropanolamine is less than 0.5% by weight, it is necessary to add a large amount of another alkaline agent, which may cause irritation to the skin. If mixed, the irritation to the skin becomes too strong, and in any case, it may have an adverse effect, which is not preferable.

As a third essential component, trimethylglycine is used. Trimethylglycine is a natural zwitterionic substance that contains a quaternary ammonium cation and a carboxylic acid anion in one molecule, and is present in sugar beet, cottonseed, and many other plants. are doing. It is also a natural ingredient considered to be one of the umami ingredients of squid and octopus. In the present invention, by blending this natural zwitterionic substance in a permanent wave agent containing thioglycolic acid or a salt thereof as a main component, it is possible to reduce irritation to the skin at the time of permanent wave treatment. It was found by the inventors' earnest research.

Trimethylglycine is incorporated in the present invention in an amount of 0.1 to 5% by weight. The reason for this is that if the amount of trimethylglycine is less than 0.1% by weight, the effect of suppressing skin irritation to fingers and the like at the time of permanent wave treatment is not exhibited, while if it is more than 5% by weight, This is because stickiness is observed in the hair after the treatment, and the texture of the hair after the treatment may be impaired.

The permanent waving agent of the present invention containing the above essential components needs to have the pH of the system set to 8.5 or more. The reason for this is that if the pH of the system is less than 8.5, the reducing power of thioglycolic acid or its salts used as a reducing agent is reduced, and the swelling action of hair is weakened, so that a strong wave power is obtained. This is not preferable because it is not available.

As described above, the permanent waving agent according to the present invention, which comprises three components of thioglycolic acid or salts thereof, isopropanolamines and trimethylglycine as essential components, comprises a normal permanent waving agent in addition to the above essential components. Other known ingredients used for: fragrances, surfactants, purified water, polyhydric alcohols, humectants, sequestering agents, hair swelling agents, wetting agents, alkali agents, hair protection agents, emulsifiers, penetrants Agents, lubricants and the like can be appropriately compounded as needed.

[0015]

Formulation Examples Hereinafter, formulation examples of the permanent wave agent according to the present invention will be described. (Formulation Example 1) wt% ammonium thioglycolate solution (50%) 14.0 monoisopropanolamine 3.0 trimethylglycine 2.0 ammonia water (25%) 0.5 ammonium bicarbonate 2.0 urea 1.0 diethylenetriamine Pentaacetic acid pentasodium solution (40%) 0.1 liquid paraffin 1.0 polyoxyethylene oleyl ether (50 EO) 2.0 polyoxyethylene nonyl phenyl ether (10 EO) 1.0 hydrolyzed collagen solution 2.0 hydrolyzed keratin solution 1.0 benzyl alcohol 0.1 purified water balance part total 100.0

Formulation Example 2% by weight Ammonium thioglycolate solution (50%) 20.0 Diammonium dithiodiglycolate solution (40%) 8.0 Monoisopropanolamine 2.0 Diisopropanolamine 0.5 Trimethylglycine 3.0 Aqueous ammonia (25%) 0.6 Sodium bicarbonate 2.0 Sodium carbonate 0.5 Pentasodium diethylenetriaminepentaacetic acid solution (40%) 0.1 Liquid paraffin 1.5 Polyoxyethylene oleyl ether (50 EO) .) 3.0 mink oil 1.0 polyoxyethylene oleyl ether (20E.O.) 1.0 amodimethicone emulsion 1.0 stearyl trimethyl ammonium chloride 0.5 purified water balance part total 100.0

[0017]

EXAMPLES The effects of the permanent wave agent according to the present invention will be further clarified by giving Examples and Comparative Examples. However, the present invention is not limited by the following embodiments.

(Examples 1 to 3 and Comparative Examples 1 to 5) Ammonium thioglycolate, isopropanolamines,
Ammonia water and other ingredients were blended according to the formulation in Table 1 to prepare permanent waving agents of Examples 1 to 3 and Comparative Examples 1 to 5.

[Table 1]

[0019]

[Test example]

(1) Wave efficiency A bundle of 10 normal hairs that had not been chemically treated was bundled according to the Kilby method according to Examples 1 to 3 and Comparative Example 1.
Permanent wave agent obtained at ~ 5, 1 in 30 ° C
After immersion for 0 minutes and washing with water for 30 seconds, the water was lightly drained and then immersed in the second agent [Paria rich boisoapalm (hard)] at 30 ° C. for 10 minutes to form a wave. Thereafter, the hair tress was washed with water for 30 seconds and lightly drained, and the wave efficiency (%) was calculated according to the Kilby method. The obtained wave efficiency is 70%
Those that were above were rated as ◎, those with 60% or more and less than 70% were rated as Δ, those with 50% or more and less than 60% were rated as Δ, and those with less than 50% were rated as x. Table 2 shows the results.
Shown in (2) Hand roughness evaluation Ten hairdressers selected arbitrarily were allowed to use the permanent waving agents obtained in Examples 1 to 3 and Comparative Examples 1 to 5 three times a day continuously for 7 days. The sensory test was conducted for the roughness of the hands. 3 points for "I do not feel rough hands", 2 points for "I hardly feel rough hands", "Slightly rough hands"
Was scored as 1 point, and "hand was rough" was scored as 0 point, and those having a total average score of 2.5 or more for each sample were evaluated as ◎, 1.5 to
Less than 2.5 was evaluated as Δ, 0.5 to less than 1.5 was evaluated as Δ, and less than 0.5 was evaluated as ×. Table 2 shows the results.

[0020]

[Table 2]

As is evident from the results in Table 2, it can be seen that the permanent waving agent of the example has a good hair waving efficiency and does not make the person who has applied the composition feel rough. On the other hand, it can be seen that the permanent waving agent (Comparative Example 1, Comparative Example 2) in which monoethanolamine is blended in place of the isopropanolamines causes the operator to have rough hands. In addition, even when thioglycolic acid and isopropanolamine were blended, the composition without trimethylglycine (Comparative Example 3)
The practitioner felt rough hands, indicating that the skin protection was not sufficient. Even when isopropanolamines and trimethylglycine are blended, the composition with a low content of thioglycolic acid (Comparative Example 4) and the composition with a low content of isopropanolamines (Comparative Example 5) have a wave efficiency for hair. Is low.

[0022]

As described in detail above, the present invention provides 5% by weight.
The above thioglycolic acid or salts thereof, 0.5 to 5% by weight of isopropanolamine, and 0.1 to 5% by weight
And the pH of the system is 8.5 or more, and therefore, as is clear from the results of the above test examples, the formation of waves on hair It is an excellent effect that it is a permanent wave agent that is excellent in effect, does not cause roughening to the perm practitioner, has low irritation to the skin of the scalp and fingers, and has good safety.

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Nobunori Fujiwara 5-12, Jungen-cho, Chuo-ku, Osaka-shi Mandom Central Research Laboratory Co., Ltd. (56) References JP-A-5-271039 (JP, A) JP-A-60-243011 (JP, A) JP-A-56-65812 (JP, A) JP-A-6-313915 (JP, A) JP-A-6-293621 (JP, A) JP-A-2-59509 (JP, A) Japanese Patent Publication No. 51-9003 (JP, B1) Japanese Patent Publication No. Sho 60-500210 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) A61K 7/09 CA (STN )

Claims (1)

(57) [Claims] 1. An essential component comprising 5% by weight or more of thioglycolic acid or a salt thereof, 0.5 to 5% by weight of isopropanolamines, and 0.1 to 5% by weight of trimethylglycine. And the pH of the system is 8.5
A permanent wave agent characterized by the above.