WO2011045840A1 - Hair cosmetic composition - Google Patents

Abstract

Disclosed is a hair cosmetic composition which is capable of improving the strength of hair, while providing the hair with a moist soft feeling, smoothness and sufficient gloss. Specifically disclosed is a hair cosmetic composition which contains a keratin amino acid that is derived from human hair and has an average molecular weight of 90-200, and a surfactant. The keratin amino acid content in the hair cosmetic composition is controlled to be 0.1-20% by weight, while adjusting the pH of the hair cosmetic composition within the range of 3-9.

Description

Hair cosmetic composition

The present invention relates to a hair cosmetic composition, and more particularly to a hair cosmetic composition suitably used as a shampoo, a treatment, a permanent pretreatment agent, a hair dyeing pretreatment agent, or the like.

Usually, hair is constantly subjected to stress due to dirt and sun ultraviolet rays, and besides that, it is damaged by severe stress due to the heat of hair dryers and beauty treatments such as perm and hair dyeing. And it is known that the hair damaged by such stress will be in a dull state without moisture, a state lacking smoothness and luster, and the strength will decrease.

Under such circumstances, for example, shampoos and rinses, treatments, conditioners, styling agents, permanent pretreatment agents, hair dyeing pretreatment agents, and so on, so-called hair cosmetic compositions, which are originally included depending on the application. Attempts have been made to prevent damage to hair due to stress, repair damaged hair, and the like by including special components in addition to the components.

For example, as one of such attempts, a keratin hydrolyzate having a sufficiently large average molecular weight of about 200 to 30,000 is added alone or in combination with another special component. Cosmetic compositions (for example, see Patent Documents 1 to 4 below) have been proposed.

As is well known, keratin is a hard protein that constitutes epithelial tissues such as vertebrate hair, feathers, wool, epidermis, nails, horns, etc., moisturizing hair, film-forming effect, damage repair effect Demonstrate. Therefore, by using a hair cosmetic composition containing such a keratin hydrolyzate, it is possible to impart moist and moist feeling, smoothness and sufficient gloss to the hair. In addition, in such a conventional hair cosmetic composition, a keratin hydrolyzate contained therein is selected and used having a large average molecular weight of about 200 to 30,000. The dispersibility of the keratin hydrolyzate in the cosmetic composition is high, whereby the excellent effects described above can be achieved more reliably.

However, the present inventors have examined the effects obtained by using such a conventional hair cosmetic composition for various applications from various angles. It has been found that it is extremely difficult to prevent a reduction in the strength of the received hair, and that there is still room for improvement.

Japanese Patent Laid-Open No. 10-17427 JP 2000-86464 A Japanese Patent Laid-Open No. 3-11099 JP 2004-203778 A

Here, the present invention has been made in the background as described above, and the problem to be solved is that the hair has a moist, moist, smooth and sufficient gloss. An object of the present invention is to provide a hair cosmetic composition that can effectively increase the strength of the hair while being applied.

And in order to solve this problem, the present inventors conducted various experiments. Among keratin amino acids obtained by hydrolyzing keratin derived from human hair, in particular, conventional hair cosmetic compositions. The use of a relatively small average molecular weight keratin amino acid, which is not used as an ingredient in the hair cosmetic composition, in a predetermined amount as a constituent of the hair cosmetic composition improves the problem of reduced hair strength. I found out. In addition, after adding a surfactant to the hair cosmetic composition containing such a specific keratin amino acid, the pH of the hair cosmetic composition (the pH of the aqueous solution) is specified. It has also been found that by adjusting the value within the range, the dispersibility of the keratin amino acid having a small average molecular weight in the hair cosmetic composition can be advantageously improved. Thus, the present invention has been completed as a result of further research conducted by the present inventors based on these findings.

In the present invention, in order to solve the above-mentioned problem or the problem grasped from the entire description and drawings of the present specification, it can be suitably implemented in various modes as listed below. . Each aspect described below can be adopted in any combination, and the aspect or technical features of the present invention are not limited to those described below, and the entire specification. It should be understood that the present invention can be recognized based on the description of the invention and the inventive idea disclosed in the drawings.

(1) It contains a keratin amino acid derived from human hair having an average molecular weight of 90 to 200 and a surfactant, the content of the keratin amino acid is 0.1 to 20% by weight, and the pH value is A hair cosmetic composition characterized by being adjusted to a value within the range of 3 to 9.

(2) The hair cosmetic composition according to the above aspect (1), wherein the content of the surfactant is 1 to 60% by weight.

(3) The above aspect (1) or (), wherein the content of the keratin amino acid is 0.1 to 5.0% by weight and the surfactant is an anionic surfactant and is used as a shampoo. Hair cosmetic composition as described in 2).

(4) The above aspect (1) or (2), wherein the content of the keratin amino acid is 0.1 to 10% by weight, and the surfactant is a cationic surfactant and is used as a treatment. Hair cosmetic composition as described in 1).

(5) The keratin amino acid content is 0.1 to 20% by weight, the surfactant is one of an anionic surfactant and a cationic surfactant, and a permanent pretreatment agent. The hair cosmetic composition according to the above aspect (1) or (2), which is used as a cosmetic composition.

(6) The content of the keratin amino acid is 0.1 to 20% by weight, and the surfactant is one of an anionic surfactant and a cationic surfactant, and hair dyeing pretreatment The hair cosmetic composition according to the above aspect (1) or (2), which is used as an agent.

That is, in the hair cosmetic composition according to the present invention, the keratin amino acid obtained by hydrolyzing keratin and the like contains a moist and moist feeling with moisture and sufficient smoothness. Glossiness can be imparted.

In such a hair cosmetic composition, in particular, keratin amino acids derived from human hair having a sufficiently small average molecular weight of 90 to 200 that easily penetrate into hair are used as keratin amino acids. Since it is contained in an amount in the range of 20% by weight, such keratin amino acids can easily and reliably penetrate into hair damaged by various stresses, and also improve the adsorptivity of keratin amino acids to hair. Thus, the strength of the hair can be effectively increased.

Moreover, in the hair cosmetic composition according to the present invention, the keratin amino acid is contained together with the surfactant, and the pH value of the hair cosmetic composition is adjusted to a value within the range of 3-9. Thus, the dispersibility in the hair cosmetic composition of keratin amino acids having a small average molecular weight, which was conventionally considered to be poor in dispersibility in the hair cosmetic composition, could be effectively increased. . As a result, for example, precipitation of keratin amino acids in the hair cosmetic composition aqueous solution is advantageously eliminated, and not only the usability of the hair cosmetic composition is improved, but also the permeability and adsorptivity of keratin amino acids to the hair are improved. Improvements could be realized more reliably.

Therefore, the hair cosmetic composition according to the present invention as described above can not only effectively give moist and moist feeling, smoothness and sufficient gloss to the hair, but also the strength of the hair. Can be reliably and stably increased at a higher level.

From the hair sample washed using the shampoo solution comprising the hair cosmetic composition containing keratin amino acid derived from human hair and the hair cosmetic composition containing hydrolyzed keratin solution derived from wool obtained in Example 1 It is a graph which shows each tensile strength of the hair sample wash | cleaned using the shampoo liquid which becomes. A hair sample treated in the treatment liquid comprising a hair cosmetic composition containing a keratin amino acid derived from human hair and a nonionic surfactant, obtained in Example 2, and a hydrolyzed keratin liquid derived from wool It is a graph which shows each tensile strength of the hair sample treated using the treatment liquid which consists of hair cosmetics compositions. A hair sample treated with a treatment liquid comprising a hair cosmetic composition containing a keratin amino acid derived from human hair and an anionic surfactant, obtained in Example 3, and a hydrolyzed keratin liquid derived from wool It is a graph which shows each tensile strength of the hair sample treated using the treatment liquid which consists of hair cosmetics compositions. A hair sample treated with a treatment liquid comprising a hair cosmetic composition containing a keratin amino acid derived from human hair and a cationic surfactant, obtained in Example 4, and a hydrolyzed keratin liquid derived from wool It is a graph which shows each tensile strength of the hair sample treated using the treatment liquid which consists of hair cosmetics compositions. A hair sample treated in the treatment liquid comprising a hair cosmetic composition containing a keratin amino acid derived from human hair and an anionic surfactant, obtained in Example 4, and a hydrolyzed keratin liquid derived from wool It is a graph which shows the average friction coefficient of each surface of the hair sample treated using the treatment liquid which consists of hair cosmetics compositions. A hair sample obtained in Example 5 and pre-perm treated with a perm pre-treatment agent comprising a hair cosmetic composition comprising a keratin amino acid derived from human hair and a cocoylalanine TEA surfactant; It is a graph which shows each tensile strength of the hair sample which carried out the permanent pretreatment using the permanent pretreatment agent which consists of a hair-cosmetics composition containing a hydrolysis keratin liquid. A hair sample pretreated by hair dyeing using a hair dyeing pretreatment agent comprising a hair cosmetic composition containing keratin amino acid derived from human hair and Na olefin (C14-16) sulfonate obtained in Example 6 It is a graph which shows each tensile strength of the hair sample pre-dyeed using the hair dye pretreatment agent which consists of a hair-cosmetics composition containing the hydrolysis keratin liquid derived from wool.

By the way, the hair cosmetic composition according to the present invention contains keratin amino acids and a surfactant as essential components. The keratin amino acids are derived from human hair, that is, hard proteins constituting human hair. Must be a component of some keratin. This is because keratin constitutes human hair, vertebrate hair, epidermis, nails, horns, or epithelial tissues such as feathers and wool except human hair, but keratin is a constituent of human hair. This is because the desired effect described above cannot be obtained by using any keratin amino acid constituting keratin other than the above.

In the present invention, among such keratin amino acids derived from human hair, those having an average molecular weight of 90 to 200 are used. This is because, when a keratin amino acid having an average molecular weight exceeding 200 is used, the permeability of such keratin amino acid to the hair is lowered, and the effect of improving the strength of the hair due to the penetration of the keratin amino acid is lowered. Because. In addition, when a keratin amino acid having an extremely small average molecular weight of less than 90 is used, the molecular weight of the keratin amino acid is too small, so that the adsorptivity to hair is remarkably lowered, and this also can sufficiently improve the strength of the hair. Because it will disappear.
A suitable range for the average molecular weight of such keratin amino acids is 90 to less than 200, more preferably 100 to 180.

Such a keratin amino acid derived from human hair having an average molecular weight of 90 to 200 can be obtained, for example, by hydrolyzing human hair by a known method. Examples of the keratin amino acid include valine, leucine, isoleucine, phenylalanine, proline, serine, threonine, tyrosine, aspartic acid, glutamic acid, arginine, lysine, histidine, methionine and the like.

In the hair cosmetic composition of the present invention, such keratin amino acid is contained in the range of 0.1 to 20% by weight. This is because when the content of keratin amino acid in the hair cosmetic composition is less than 0.1% by weight, the content of keratin amino acid in the composition is too small, and thus the hair obtained by the inclusion of keratin amino acid. This is because the moisturizing effect, film-forming effect, damage repairing effect, and the effect of improving the strength of the hair as described above cannot be sufficiently obtained. In addition, the effects of the inclusion of such keratin amino acids in the composition tend to be enhanced with an increase in the content of keratin amino acids, but the degree of enhancement of such effects is When the content of keratin amino acid gradually decreases as the content of keratin amino acid approaches 20% by weight and the content exceeds 20% by weight, even if the content of keratin amino acid is increased, the composition of keratin amino acid is increased. The increase in the effect due to the inclusion of is hardly recognized, and on the contrary, the increase in cost due to the increase in the amount of keratin amino acid used becomes remarkable. Therefore, the content of the keratin amino acid in the hair cosmetic composition is 0.1 to from the viewpoint of sufficiently securing the effect obtained by the inclusion of the keratin amino acid while suppressing the production cost of the hair cosmetic composition. It must be 20% by weight. A suitable range of the content of the keratin amino acid in the hair cosmetic composition is 1 to 20% by weight.

In addition, the hair cosmetic composition according to the present invention contains a surfactant as an essential component together with the keratin amino acid. Thereby, the dispersibility of, for example, an aqueous solution of a hair cosmetic composition of a keratin amino acid having a small average molecular weight can be effectively enhanced. Examples of such surfactants include anionic surfactants, cationic surfactants, nonionic surfactants, and amphoteric surfactants that are generally contained in conventional hair cosmetic compositions. More than one type is used in combination.

Examples of the anionic surfactant that can be used in the present invention include cocoyl methyl taurine Na, stearoyl methyl taurine Na, laureth sulfosuccinate 2Na, olefin (C14-16) sulfonate Na, lauryl sulfate Na, POE lauryl ether sulfate Na, laureth. Examples include sodium sulfate, dodecyl benzene sulfonic acid triethanolamine, tetradecene sulfonic acid Na, POE lauryl ether phosphoric acid, and salts thereof.

Cationic surfactants include behentrimonium chloride, lauryl trimethyl ammonium chloride, stearyl trimethyl ammonium chloride, alkyl trimethyl ammonium chloride, distearyl methyl ammonium chloride, cetyl trimethyl ammonium bromide, stearyl trimethyl ammonium bromide, ethyl lanolin sulfate fatty acid amino acid Examples thereof include propylethyldimethylammonium, stearyltrimethylammonium saccharin, cetyltrimethylammonium saccharin and the like.

Examples of nonionic surfactants include glyceryl stearate, sorbitan oleate, POE alkyl ethers, POE alkyl phenyl ethers, POE / POP alkyl ethers, POE sorbitan fatty acid esters, POE propylene glycol fatty acid esters, and the like. The Specific examples of POE alkyl ethers include POE lauryl ether, POE cetyl ether, POE stearyl ether, POE behenyl ether, and the like.

Examples of the double-sided surfactant include lauryl betaine, dimethicone copolyol, 2-undecyl-N, N, N- (hydroxyethylcarboxymethyl) -2-imidazoline sodium, cocoamidopropyl betaine, lauramidopropyl betaine, Examples include lauryl dimethylaminoacetic acid betaine.

The content of these surfactants in the hair cosmetic composition is not particularly limited, but is preferably in the range of 1 to 60% by weight. This is because when the content of such a surfactant is less than 1% by weight, the amount of the surfactant in the hair cosmetic composition is too small, and thus the effect obtained by the inclusion of the surfactant, ie, This is because the excellent effect of enhancing the dispersibility of the keratin amino acid having a small average molecular weight in the hair cosmetic composition (for example, an aqueous solution thereof) cannot be sufficiently exhibited. In addition, when the content of the surfactant exceeds 60% by weight, there arises a problem that the permeability and adsorption property of keratin amino acids into the hair are adversely affected.

A hair cosmetic composition containing a surfactant and a keratin amino acid is used as an aqueous solution, for example, and the pH value of the aqueous solution of such a hair cosmetic composition is in the range of 3 to 9. Must be adjusted to the value in This is because, as described above, in the hair cosmetic composition of the present invention, the keratin amino acid contained therein is conventionally used because of its poor dispersibility in the hair cosmetic composition. In addition to the fact that a surfactant is included as an essential component in the hair cosmetic composition, the pH value of the hair cosmetic composition is within the range of 3 to 9 in spite of having a small average molecular weight. With this value, the dispersibility of the keratin amino acid in the hair cosmetic composition can be effectively improved. Therefore, when the pH value of the hair cosmetic composition is less than 3, even if such a hair cosmetic composition contains a surfactant, the keratin amino acid in the hair cosmetic composition This is because it is difficult to sufficiently enhance the dispersibility of the hair, and when the pH value exceeds 9, the function as a hair cosmetic is not sufficiently exhibited. Because. It is desirable that the pH value of the hair cosmetic composition is a value within the range of 4-8.

The hair cosmetic composition according to the present invention contains a surfactant and a keratin amino acid as essential components, and also contains various components according to its use. For example, shampoo, rinse, treatment, styling It will be used as an agent, a permanent pre-treatment agent, a permanent post-treatment agent, a hair dyeing pre-treatment agent, a hair dyeing post-treatment agent, and the like.

When such a hair cosmetic composition is used as, for example, a shampoo, the content of the keratin amino acid in the hair cosmetic composition is preferably 0.1 to 5.0% by weight. . This is because if the keratin amino acid content is less than 0.1% by weight, the various effects described above due to the keratin amino acid content may not be obtained effectively. In addition, as the content of keratin amino acid increases, the effect due to the inclusion of keratin amino acid is enhanced, but as the content approaches 5.0% by weight, the degree of enhancement of the effect gradually slows down. Furthermore, when the content exceeds 5.0% by weight, even if the content of keratin amino acid is increased, the increase in the effect due to it is hardly recognized. This is because the soaring of the price becomes remarkable. The content of the keratin amino acid in the hair cosmetic composition used as a shampoo is more preferably about 1 to 5% by weight.

In the case where the hair cosmetic composition of the present invention is used as a shampoo, the type of surfactant contained as an essential component together with the keratin amino acid is not particularly limited. Preferably, an anionic surfactant is used. As this anionic surfactant, any of those exemplified above can be used. Further, the content of the anionic surfactant in the hair cosmetic composition is set to 30 to 60% by weight, which is a preferable content in the hair cosmetic composition of the present invention, for the same reason as described above. It is desirable.

Thus, human hair-derived keratin amino acids having an average molecular weight of 90 to 200 are contained in a proportion of 0.1 to 5.0% by weight, an anionic surfactant is contained, and the pH is 3 to 9, When the hair cosmetic composition preferably adjusted to 5 to 7 is used as a shampoo, it is possible to reduce irritation to the skin when washing the hair, and to exhibit excellent foaming and detergency, In addition to that, moist and moist feeling with smoothness and sufficient gloss can be imparted to the hair, as well as an improvement in the strength of damaged hair can be effectively achieved. It is.

On the other hand, when the hair cosmetic composition of the present invention is used as a treatment, the content of the keratin amino acid in the hair cosmetic composition is preferably 0.1 to 10% by weight. This is because if the keratin amino acid content is less than 0.1% by weight, the various effects described above due to the keratin amino acid content may not be obtained effectively. Moreover, when the content of the keratin amino acid exceeds 10% by weight, it becomes difficult to make the aqueous solution of the hair cosmetic composition into a creamy form, making it difficult to use as a treatment. The content of the keratin amino acid in the hair cosmetic composition used as a treatment is more preferably about 5 to 7% by weight.

When the hair cosmetic composition of the present invention is used as a treatment, the type of surfactant contained as an essential component together with keratin amino acids is not particularly limited. Preferably, a cationic surfactant is used. As this cationic surfactant, any of those exemplified above can be used. In addition, the content of the cationic surfactant in the hair cosmetic composition is set to 5 to 30% by weight, which is a preferable content in the hair cosmetic composition of the present invention, for the same reason as described above. It is desirable.

Thus, human hair-derived keratin amino acids having an average molecular weight of 90 to 200 are contained in a proportion of 0.1 to 10% by weight, and a cationic surfactant is contained, so that the pH is preferably 3 to 9. The hair cosmetic composition adjusted to 4-8 is used as a treatment, so that it can exhibit high adsorptivity to hair, exhibits excellent wetting action on hair, and is sufficiently smooth. In addition to the feeling and gloss that can be imparted to the hair, the strength of the damaged hair can be effectively improved.

When the hair cosmetic composition of the present invention is used as a permanent pretreatment agent, the content of keratin amino acid in the hair cosmetic composition is preferably 0.1 to 20% by weight. This is because if the keratin amino acid content is less than 0.1% by weight, the above-described effects due to the keratin amino acid content may not be obtained effectively. Even when the hair cosmetic composition is used as a permanent pretreatment agent, the effect of the keratin amino acid content is enhanced with the increase of the keratin amino acid content, but the content is 20 As the percentage approaches weight%, the degree of enhancement of the effect gradually slows down. Further, when the content exceeds 20% by weight, even if the content of keratin amino acid is increased, the enhancement of the effect is hardly caused. This is because the cost increase due to the increase in the amount of keratin amino acid used becomes remarkable. The content of the keratin amino acid in the hair cosmetic composition used as the permanent pretreatment agent is more preferably about 5 to 8% by weight.

Further, when the hair cosmetic composition of the present invention is used as a permanent pretreatment agent, the kind of surfactant contained as an essential component together with the keratin amino acid is particularly limited. However, preferably, one of an anionic surfactant and a cationic surfactant is used. As these anionic surfactants and cationic surfactants, any of those exemplified above can be used. In addition, regardless of whether an anionic surfactant or a cationic surfactant is used, the content of these surfactants in the hair cosmetic composition is the same as described above. It is desirable that the content is 1 to 10% by weight, which is a suitable content in the cosmetic composition.

Thus, human hair-derived keratin amino acids having an average molecular weight of 90 to 200 are contained in a proportion of 0.1 to 20% by weight, and either an anionic surfactant or a cationic surfactant is contained. The hair cosmetic composition having a pH adjusted to 3 to 9, more preferably 5 to 8 is used as a permanent pretreatment liquid, so that the hair is subjected to a permanent treatment that causes severe damage. On the other hand, the keratin amino acid is sufficiently permeated and adsorbed, so that a decrease in hair strength and a damage on the hair surface due to the permanent treatment can be advantageously prevented in advance.

Furthermore, when the hair cosmetic composition of the present invention is used as a hair dyeing pretreatment agent, the content of the keratin amino acid in the hair cosmetic composition is preferably 0.1 to 20% by weight. Is done. This is due to the same reason as the case where the hair cosmetic composition of the present invention is used as a permanent pretreatment agent. The content of the keratin amino acid in the hair cosmetic composition used as a hair dyeing pretreatment agent is more preferably about 1 to 20% by weight.

Further, when the hair cosmetic composition of the present invention is used as a hair dyeing pretreatment agent, the type of surfactant contained as an essential component together with the keratin amino acid is particularly limited. Although it is not a thing, Preferably, any one of an anionic surfactant and a cationic surfactant is used. As these anionic surfactants and cationic surfactants, any of those exemplified above can be used. In addition, regardless of whether an anionic surfactant or a cationic surfactant is used, the content of these surfactants in the hair cosmetic composition is the same as described above. It is desirable that the content is 1 to 20% by weight, which is a suitable content in the cosmetic composition.

Thus, human hair-derived keratin amino acids having an average molecular weight of 90 to 200 are contained in a proportion of 0.1 to 20% by weight, and either an anionic surfactant or a cationic surfactant is contained. The hair cosmetic composition having a pH adjusted to 3 to 9, more preferably 5 to 8, is used as a hair dyeing pretreatment liquid, so that the hair dye suffers severe damage as in the permanent treatment. Before the treatment is performed, the keratin amino acid is sufficiently permeated and adsorbed to the hair, so that a decrease in the strength of the hair and a damage to the hair surface due to the hair dyeing treatment can be advantageously prevented in advance. Moreover, color loss of the hair that has been dyed can be more effectively prevented by sufficiently adsorbing keratin amino acids to the hair before the hair dyeing treatment.

Examples of the present invention will be shown below to clarify the present invention more specifically. However, the present invention is not limited by the description of such examples. Needless to say. In addition to the following examples, the present invention includes various modifications based on the knowledge of those skilled in the art without departing from the spirit of the present invention, in addition to the specific description described above. It should be understood that modifications, improvements, etc. can be made. In the following examples, all parts, ratios and percentages are shown on a weight basis unless otherwise specified.

<Example 1>
First, a predetermined amount of human hair was used and hydrolyzed by a known method to prepare a predetermined amount of human hair-derived keratin amino acid. When the average molecular weight of the keratin amino acid was measured according to the conventional method, the value was 90 to 200. Separately, a predetermined amount of wool is hydrolyzed by a known method to prepare a predetermined amount each of a hydrolyzed keratin solution having an average molecular weight of 400 and a hydrolyzed keratin solution having an average molecular weight of 10,000. And prepared. Further, as the surfactant, a predetermined amount of each of cocoylmethyltaurine Na and sulfolauric acid laureth 2Na as an anionic surfactant, and a predetermined amount of each of lauryl betaine and dimethicone copolyol as an amphoteric surfactant are prepared. did.

Next, six types of shampoo solutions were prepared according to the composition shown in Table 1 below, using the prepared human hair-derived keratin amino acids, wool-derived hydrolyzed keratin solution, surfactant, and other optional components. In addition, the pH values of these six types of shampoo liquids were adjusted to 5 to 7 by adjusting the concentrations of the contained components. Shampoo solutions containing keratin amino acids derived from human hair in proportions of 0.1% by weight, 1.0% by weight, 2.0% by weight and 5.0% by weight, respectively, Invention Example 1, Invention Example 2, Invention It was set as Example 3 and Invention Example 4. Further, a shampoo solution containing a wool-derived hydrolyzed keratin solution having an average molecular weight of 400 was used as Comparative Example 1, and a shampoo solution containing a wool-derived hydrolyzed keratin solution having an average molecular weight of 10,000 was used as Comparative Example 2. In Table 1 and Tables 2 to 6 to be described later, a hydrolyzed keratin liquid having an average molecular weight of 400 is shown as hydrolyzed keratin liquid A, and a hydrolyzed keratin liquid having an average molecular weight of 10,000 is represented by a hydrolyzed keratin liquid. Shown as B.

The shampoo solution of Invention Example 1 out of the six types of shampoo solutions thus prepared (Invention Examples 1 to 4, Comparative Examples 1 and 2) was applied to a human hair sample (hair bundle). After washing the hair sample, the shampoo solution was washed away with water. Thereafter, the hair sample was lightly wiped with a towel and then dried with a dryer. Then, after washing and drying operations for the hair sample were repeated 10 times, a plurality of hairs having the same diameter of 0.08 mm were randomly cut from the hair sample. Thereafter, only 30 hairs were selected from the plurality of hairs thus obtained, and a known hair tension tester [30 ° C., humidity: 60%] was applied to each of the 30 hairs. A tensile test using a KES-G1-SH high-sensitivity hair tensile tester manufactured by Kato Tech Co., Ltd. was performed, and the load value at the time of breakage of each hair was examined. And the average value of the load value at the time of each fracture | rupture of these 30 hairs was computed. The results are shown in FIG.

Separately, the shampoo liquids of Invention Examples 2 to 4 and the shampoo liquids of Comparative Example 1 and Comparative Example 2 were used, respectively, and five hair samples were obtained in the same manner as when the shampoo liquid of Invention Example 1 was used. Washing and drying operations were repeatedly performed 10 times, and then 30 hairs were collected from each hair sample. And the tension test with respect to 30 hair extract | collected from each of these hair samples was done one by one, the load at the time of each fracture | rupture was investigated, Furthermore, the average value was computed for every hair sample. For comparison, after collecting 30 hairs from a hair sample obtained by repeating washing and drying operations by washing 10 times without using any shampoo solution, a tensile test on these 30 hairs was performed. Was carried out one by one, the load at each break was examined, and the average value was calculated. The results are also shown in FIG. The average load values of Invention Examples 1 to 4 and Comparative Examples 1 and 2 shown in FIG. 1 are the values of hairs washed with the shampoo solutions of Invention Examples 1 to 4 and Comparative Examples 1 and 2, respectively. The average load value at break is shown. The untreated average load value indicates an average load value at the time of breakage of the hair washed by washing with water without using a shampoo solution.

As apparent from FIG. 1, the hair collected from the hair sample that was repeatedly washed with water and dried without using a shampoo solution had an average load value at break of 93. It was 08 g. On the other hand, the shampoo solution of Invention Example 1 was used as the average value of the load value at the time of breakage by the tensile test of the hair collected from the hair sample that was repeatedly washed and dried using the shampoo solution. 98.02 g in the case, 123.06 g when the shampoo liquid of Invention Example 2 is used, 125.41 g when the shampoo liquid of Invention Example 3 is used, and when the shampoo liquid of Invention Example 4 is used. Was 126.2 g. Moreover, when using the shampoo liquid of the comparative example 1, it was 113.2 g, and when using the shampoo liquid of the comparative example 2, it was 110.48 g.

From these results, when the hair cosmetic composition of the present invention containing an anionic surfactant is used as a shampoo solution, it is of course derived from wool when compared to the case where the hair is washed only by washing with water. The tensile strength of the hair is effectively increased even when the hair is washed with a shampoo solution (Comparative Examples 1 and 2) containing a hydrolyzed keratin solution containing a keratin amino acid having a large average molecular weight. Getting can be easily recognized. Further, even when the hair cosmetic composition of the present invention is used as a shampoo solution, it is recognized that the tensile strength of hair is improved as the content of keratin amino acid derived from human hair increases.

<Example 2>
A predetermined amount of keratin amino acid derived from human hair having an average molecular weight of 90-200, a predetermined amount of hydrolyzed keratin liquid derived from wool having an average molecular weight of 400, and a wool having an average molecular weight of 10,000 prepared in Example 1 A predetermined amount of the hydrolyzed keratin solution was prepared. Separately, a predetermined amount of each of glyceryl stearate, sorbitan oleate, and polysorbate 60 as a nonionic surfactant was prepared as a surfactant.

Next, using the prepared human hair-derived keratin amino acids, wool-derived hydrolyzed keratin solution, surfactant, and other optional components, six treatment liquids were prepared according to the composition shown in Table 2 below. did. These six types of treatment liquids were adjusted to pH values of 4 to 8 by adjusting the concentrations of the contained components. And the treatment liquid containing the treatment liquid containing the keratin amino acid derived from human hair in the ratio of 1.0% by weight, 2.0% by weight, 5.0% by weight and 10% by weight, respectively, Invention Example 5, Invention It was set as Example 6, Invention Example 7, and Invention Example 8. Further, a treatment liquid containing a wool-derived hydrolyzed keratin liquid having an average molecular weight of 400 was set as Comparative Example 3, and a treatment liquid containing a wool-derived hydrolyzed keratin liquid having an average molecular weight of 10,000 was set as Comparative Example 4.

The treatment liquid of Invention Example 5 out of the six treatment liquids thus prepared (Invention Examples 5 to 8 and Comparative Examples 3 and 4) is used and applied to a human hair sample (hair bundle). Then, after leaving for 5 minutes, the treatment liquid was washed away with water. Thereafter, the hair sample was lightly wiped with a towel and then dried with a dryer. And the treatment and drying operation of this hair sample were repeated 5 times. Then, in the same manner as in Example 1, a tensile test of 30 hairs collected from the hair sample was performed, and an average value of load values at the time of breaking of each of the 30 hairs was calculated. The results are shown in FIG.

Separately, the treatment liquids of Invention Examples 6 to 8 and the treatment liquids of Comparative Examples 3 and 4 were used, respectively, and five hair samples were used in the same manner as when the treatment liquid of Invention Example 5 was used. After repeating the treatment and drying operation for each of the above 5 times, 30 hairs were collected from each hair sample. And the tension test with respect to 30 hair extract | collected from each of these hair samples was performed one by one, and the average value of the load value at the time of the fracture | rupture of these 30 hairs was computed for every hair sample. For comparison, another hair sample was immersed in water for 5 minutes without using any treatment solution, and then dried with a drier for 5 times. And after collecting 30 hairs from the hair sample and carrying out a tensile test, the average value of the load values at the time of breaking the 30 hairs was calculated. The results are also shown in FIG. The average load values of Invention Examples 5 to 8, Comparative Example 3 and Comparative Example 4 shown in FIG. 2 are treated using the treatment solutions of Invention Examples 5 to 8 and Comparative Examples 3 and 4, respectively. The average load value at the time of breaking of the hair is shown. Further, the term “no treatment” refers to an average load value at the time of breakage of hair in which an operation of dipping in water and drying without using a treatment liquid is repeatedly performed.

As apparent from FIG. 2, the hair collected from the hair sample that was repeatedly dipped in water and dried without using the treatment liquid was the average of the load values at the time of breaking by the tensile test. Was 93.08 g. On the other hand, the treatment liquid of Invention Example 5 was used as the average value of the load value at the time of breakage by the tensile test of the hair collected from the hair sample that was repeatedly treated and dried using the treatment liquid. When the treatment liquid of Invention Example 6 is used, 132.4 g, when the treatment liquid of Invention Example 7 is used, 134.2 g, when the treatment liquid of Invention Example 8 is used Was 136.0 g. When the treatment liquid of Comparative Example 3 was used, the amount was 117.16 g, and when the treatment liquid of Comparative Example 4 was used, the amount was 110.06 g.

From these results, when the hair cosmetic composition of the present invention containing a nonionic surfactant is used as a treatment liquid, the hair is treated, and the hair is simply soaked in water and then dried. Of course, the tensile strength of the hair is more effective than the treatment using the treatment liquid (Comparative Examples 3 and 4) containing hydrolyzed keratin liquid containing keratin amino acid having a large average molecular weight derived from wool. It can be clearly recognized that it can be enhanced. Moreover, when using the hair cosmetic composition of this invention as a treatment liquid, it is recognized that the tensile strength of hair increases gradually as content of the keratin amino acid derived from human hair increases.

<Example 3>
A predetermined amount of keratin amino acid derived from human hair having an average molecular weight of 90 to 200, a predetermined amount of hydrolyzed keratin liquid derived from wool having an average molecular weight of 400, and an average molecular weight of 10,000 prepared in Examples 1 and 2 A predetermined amount of hydrolyzed keratin solution derived from wool was prepared. Separately, as the surfactant, a predetermined amount of olefin (C14-16) sulfonic acid Na as an anionic surfactant and a predetermined amount of each of glyceryl oleate and lauric acid as amphoteric surfactants, Got ready.

Next, using these prepared human hair-derived keratin amino acids, wool-derived hydrolyzed keratin solution, surfactant, and other optional components, three types of treatment solutions were prepared according to the composition shown in Table 3 below. did. These three types of treatment liquids were adjusted to pH values of 4 to 8 by adjusting the concentrations of contained components. The treatment liquid containing keratin amino acid derived from human hair is referred to as Invention Example 9, the treatment liquid containing hydrolyzed keratin liquid derived from wool having an average molecular weight of 400 is referred to as Comparative Example 5, and hydrolysis derived from wool having an average molecular weight of 10,000. The treatment liquid containing keratin liquid was designated as Comparative Example 6.

And three kinds of treatment liquids thus adjusted (Invention Example 9, Comparative Examples 5 and 6)
And three hair samples were used in the same manner as in Example 2, and after repeating the treatment and drying operation for each hair sample, one tensile test was performed on 30 hairs collected from each hair sample. Each time, the load value at the time of breakage of each hair was examined, and the average value was calculated for each hair sample. The results are shown in FIG. The average load values of Invention Example 9, Comparative Example 5 and Comparative Example 6 shown in FIG. 3 are the breakage of hair treated with the treatment liquids of Invention Example 9 and Comparative Examples 5 and 6, respectively. The average load value is shown. Further, the term “no treatment” refers to an average load value at the time of breakage of hair in which an operation of immersing in water and then drying is repeated without using a treatment liquid.

As is clear from FIG. 3, the hair collected from the hair sample that had been repeatedly dried after being immersed in water without using the treatment solution was the average of the load values at the time of breaking by the tensile test. While the value was 93.08 g, the average value of the load value at the time of breakage by the tensile test of the hair collected from the hair sample that was repeatedly treated and dried using the treatment liquid is the invention. When the treatment liquid of Example 9 was used, it was 127.6 g, when the treatment liquid of Comparative Example 5 was used, 117.3 g, and when the treatment liquid of Comparative Example 6 was used, it was 111.4 g.

From these results, when the hair cosmetic composition of the present invention containing an anionic surfactant is used as a treatment liquid, the hair is treated, and the hair is simply soaked in water and then dried. Of course, the tensile strength of the hair is more effective than the treatment using the treatment liquid (Comparative Examples 5 and 6) containing hydrolyzed keratin liquid containing keratin amino acid having a large average molecular weight derived from wool. Can be easily recognized.

<Example 4>
A predetermined amount of keratin amino acid derived from human hair having an average molecular weight of 90 to 200, a predetermined amount of hydrolyzed keratin liquid derived from wool having an average molecular weight of 400, and an average molecular weight of 10,000 prepared in Examples 1 to 3 A predetermined amount of hydrolyzed keratin solution derived from wool was prepared. Separately, a predetermined amount of behentrimonium chloride as a cationic surfactant and a predetermined amount of glyceryl stearate as an amphoteric surfactant were prepared as surfactants.

Next, using the prepared human hair-derived keratin amino acids, wool-derived hydrolyzed keratin solution, surfactant, and other optional components, three types of treatment solutions were prepared according to the composition shown in Table 4 below. did. These three types of treatment solutions were adjusted to pH values of 4 to 6 by adjusting the concentrations of the contained components. The treatment liquid containing keratin amino acid derived from human hair is designated as Invention Example 10, the treatment liquid containing hydrolyzed keratin liquid derived from wool having an average molecular weight of 400 is designated as Comparative Example 7, and hydrolysis derived from wool having an average molecular weight of 10,000. The treatment liquid containing keratin liquid was designated as Comparative Example 8.

Then, using the three types of treatment liquids thus prepared (Invention Example 10, Comparative Examples 7 and 8) and three hair samples, the treatment and drying operation for each hair sample were repeated in the same manner as in Example 2. Thereafter, a tensile test was performed on 30 hairs collected from each hair sample one by one, and the load value at the time of breaking of each hair was examined, and the average value was calculated for each hair sample. . The results are shown in FIG. The average load values of Invention Example 10, Comparative Example 7, and Comparative Example 8 shown in FIG. 4 are the breakage of hair treated with the treatment liquids of Invention Example 10 and Comparative Examples 7 and 8. The average load value is shown. Further, the term “no treatment” refers to an average load value at the time of breakage of hair in which an operation of dipping in water and drying without using a treatment liquid is repeatedly performed.

As is clear from FIG. 4, the hair collected from the hair sample that was repeatedly dried after being immersed in water without using the treatment solution was the average of the load values at the time of breaking by the tensile test. While the value was 93.08 g, the average value of the load value at the time of breakage by the tensile test of the hair collected from the hair sample that was repeatedly treated and dried using the treatment liquid is the invention. When the treatment liquid of Example 10 was used, it was 132.02 g, when the treatment liquid of Comparative Example 7 was used, 118.86 g, and when the treatment liquid of Comparative Example 8 was used, it was 114.06 g.

From these results, when the hair cosmetic composition of the present invention containing a cationic surfactant is used as a treatment liquid, the hair is treated, and the hair is simply soaked in water and then dried. Of course, the tensile strength of the hair is more effective than the treatment using the treatment liquid (Comparative Examples 7 and 8) containing hydrolyzed keratin liquid containing keratin amino acid having a large average molecular weight derived from wool. Can be easily recognized.

Next, using the three types of treatment liquids (Invention Example 10, Comparative Examples 7 and 8), the hair sample in which the treatment and the drying operation as described above were repeated five times, and simply drying after dipping in water. Five hairs each having the same diameter of 0.08 mm were collected from the hair samples that were repeatedly subjected to the operation of 5 times. Thereafter, in order to examine the friction feeling of the surface of the collected hair, the average friction coefficient (MIU) of each hair was measured in a known friction feeling test machine [temperature: 23 ° C., humidity: 60%] [ KES-SE friction tester manufactured by Kato Tech Co., Ltd.] was used for measurement. In addition, for comparison, the average friction coefficient of five hairs collected from hair samples obtained by repeating the operation of dipping in water and drying after 5 times without using any treatment solution was also measured in the same manner. . The results are shown in FIG. The average friction coefficients of Invention Example 10, Comparative Example 7, and Comparative Example 8 shown in FIG. 5 are the surfaces of hair treated with the treatment liquids of Invention Example 10 and Comparative Examples 7 and 8. The average coefficient of friction is shown. The term “no treatment” refers to the average friction coefficient of hair that has been repeatedly subjected to an operation of dipping in water and then drying without using a treatment liquid.

As is apparent from FIG. 5, the hair collected from the hair sample that was repeatedly dipped in water and dried without using the treatment liquid had an average coefficient of friction of 0.27. On the other hand, the average friction coefficient of the hair collected from the hair sample that was repeatedly treated and dried using the treatment liquid was 0.20 when the treatment liquid of Invention Example 10 was used. It was 0.22 when the treatment liquid of Comparative Example 7 was used, and 0.24 when the treatment liquid of Comparative Example 8 was used.

From these results, when the hair cosmetic composition of the present invention containing a cationic surfactant is used as a treatment liquid, the hair is treated, and the hair is simply soaked in water and then dried. Of course, it is more sufficient for hair than when treating with a treatment liquid (Comparative Examples 7 and 8) containing hydrolyzed keratin liquid containing keratin amino acid having a large average molecular weight derived from wool. It is clearly recognized that a smooth feeling can be imparted.

<Example 5>
A predetermined amount of keratin amino acid derived from human hair having an average molecular weight of 90 to 200, a predetermined amount of hydrolyzed keratin liquid derived from wool having an average molecular weight of 400, and an average molecular weight of 10,000 prepared in Examples 1 to 4 A predetermined amount of hydrolyzed keratin solution derived from wool was prepared. Separately, a predetermined amount of cocoylalanine TEA, which is an anionic surfactant, was prepared as a surfactant.

Next, using these prepared human hair-derived keratin amino acids, wool-derived hydrolyzed keratin solution, surfactant, and other optional components, according to the composition shown in Table 5 below, six types of perm pretreatment agents Was prepared. These six kinds of permanent pretreatment agents were adjusted to pH values of 5 to 8 by adjusting the concentrations of the contained components. And the permanent pretreatment agent which contains the permanent pretreatment agent containing the keratin amino acid derived from human hair in the ratio of 5.0% by weight, 9.0% by weight and 20.0% by weight, respectively, Invention Example 11, Invention It was set as Example 12 and Invention Example 13. Further, a permanent pretreatment agent containing a hydrolyzed keratin solution derived from wool having an average molecular weight of 400 is used as Comparative Example 9, and a pretreatment agent containing a hydrolyzed keratin solution derived from wool having an average molecular weight of 10,000 is used as Comparative Example 10. A permanent pretreatment agent containing no keratin amino acid or hydrolyzed keratin solution was used as Comparative Example 11.

　そして、かくして調整された６種類のパーマ前処理剤（発明例１１～１３、比較例９～１１）のうちの発明例１１のパーマ前処理剤を用い、これを、洗浄後に、タオルで水分を十分に拭き取った人毛の毛髪サンプル（毛束）に塗布した。その後、還元性の第１剤としてのチオグリコール酸アンモニウムと酸化性の第２剤としての臭素酸ナトリウムとを用いて、公知の手法により、毛髪サンプルに対する縮毛矯正施術を行った後、毛髪サンプルをドライヤーで乾燥させた。そして、このパーマ前処理操作及びパーマ処理操作を３回繰り返し行った。次いで、実施例１と同様にして、毛髪サンプルから採取された３０本の毛髪の引張り試験を行って、それら３０本の毛髪のそれぞれの破断時の荷重値の平均値を算出した。その結果を、図６に示した。

Of the six types of perm pretreatment agents thus prepared (Invention Examples 11 to 13, Comparative Examples 9 to 11), the permanent pretreatment agent of Invention Example 11 was used. It was applied to a human hair sample (hair bundle) that had been sufficiently wiped off. Then, after performing a hair straightening treatment on the hair sample by a known method using ammonium thioglycolate as the reducing first agent and sodium bromate as the oxidizing second agent, the hair sample Was dried with a dryer. Then, the perm pretreatment operation and the perm treatment operation were repeated three times. Then, in the same manner as in Example 1, a tensile test of 30 hairs collected from the hair sample was performed, and an average value of load values at the time of breaking of each of the 30 hairs was calculated. The results are shown in FIG.

Separately, the permanent pretreatment agents of Invention Examples 12 and 13 and the permanent pretreatment agents of Comparative Examples 9 to 11 were used, respectively, and the same as when the permanent pretreatment agent of Invention Example 5 was used. After the perm pretreatment operation and the perm treatment operation for each hair sample were repeated three times, 30 hairs were collected from each hair sample. And the tension test with respect to 30 hair extract | collected from each of these hair samples was performed one by one, and the average value of the load value at the time of the fracture | rupture of these 30 hairs was computed for every hair sample. The results are also shown in FIG. Note that the average load values of Invention Examples 11 to 13 and Comparative Examples 9 to 11 shown in FIG. 6 are the same as before the permanent using the permanent pretreatment agents of Invention Examples 11 to 13 and Comparative Examples 9 to 11, respectively. The average load value at the time of breaking of the treated hair is shown.

As is clear from FIG. 6, using the permanent pretreatment agent of Comparative Example 11 that does not contain any keratin amino acid or hydrolyzed keratin solution, it was collected from a hair sample that had been repeatedly subjected to permanent pretreatment and permanent treatment. The average value of the load value at the time of breaking by the hair tensile test was 83.4 g. On the other hand, using a permanent pretreatment agent containing human hair-derived keratin amino acid, the load value at the time of breakage by the tensile test of the hair collected from the hair sample that was repeatedly subjected to the permanent pretreatment and the permanent treatment operation. The average value is 90.2 g when the permanent pretreatment agent of Invention Example 11 is used, 90.06 g when the permanent pretreatment agent of Invention Example 12 is used, and the permanent pretreatment agent of Invention Example 13 is used. Was 93.45 g. In addition, using a pretreatment agent containing a hydrolyzed keratin solution derived from wool, the average value of the load value at the time of breakage by a tensile test of hair collected from a hair sample that has been subjected to permanent pretreatment and perm treatment operation repeatedly Was 85.62 g when the permanent pretreatment agent of Comparative Example 9 was used, and 83.2 g when the permanent pretreatment agent of Comparative Example 10 was used.

From these results, by using the hair cosmetic composition of the present invention containing a cocoylalanine TEA surfactant as a permanent pretreatment agent, a permanent pretreatment agent that does not contain any keratin by simply performing a permanent pretreatment ( Compared to the case of performing a pretreatment with a permanent pretreatment agent (Comparative Examples 9 and 10) containing a hydrolyzed keratin solution containing a keratin amino acid having a large average molecular weight derived from wool, such as Comparative Example 11), It can be readily appreciated that the tensile strength of the hair can be effectively increased. Moreover, when using the hair cosmetic composition of this invention as a permanent treatment agent, it is recognized that the tensile strength of hair increases gradually as content of the keratin amino acid derived from human hair increases.

<Example 6>
A predetermined amount of keratin amino acid derived from human hair having an average molecular weight of 90 to 200, a predetermined amount of hydrolyzed keratin solution derived from wool having an average molecular weight of 400, and an average molecular weight of 10,000 prepared in Examples 1 to 5 A predetermined amount of hydrolyzed keratin solution derived from wool was prepared. Separately, a predetermined amount of olefin (C14-16) sulfonate Na, which is an anionic surfactant, was prepared as a surfactant.

Next, using these prepared human hair-derived keratin amino acids, wool-derived hydrolyzed keratin solution, surfactant, and other optional components, three types of hair dyeing pretreatments according to the composition shown in Table 6 below An agent was prepared. These three types of hair dye pretreatment agents were adjusted to pH values of 5 to 8 by adjusting the concentrations of the contained components. And the hair dye pretreatment agent containing keratin amino acid derived from human hair is Invention Example 14, the hair dye pretreatment agent containing hydrolyzed keratin solution derived from wool having an average molecular weight of 400 is Comparative Example 12, and the average molecular weight is 10,000. The hair dye pretreatment agent containing hydrolyzed keratin liquid derived from wool was used as Comparative Example 13.

Of the three types of hair dyeing pretreatment agents thus prepared (Invention Example 14, Comparative Examples 12 and 13), the permanent pretreatment agent of Invention Example 14 was used, and this was used as a human hair sample (hair bundle). ). Then, the hair dyeing | staining operation was performed with respect to the hair sample by the well-known method using an acidic hair dye. Then, in the same manner as in Example 1, a tensile test of 30 hairs collected from the hair sample was performed, and an average value of load values at the time of breaking of each of the 30 hairs was calculated. The results are shown in FIG.

Separately, using the hair dyeing pretreatment agents of Comparative Examples 12 and 13, respectively, and using the hair dyeing pretreatment agent of Invention Example 14, the hair dyeing pretreatment for each of the two hair samples. After the operation, the hair dyeing operation for each hair sample was performed. Thereafter, 30 hairs were collected from each hair sample. And the tension test with respect to 30 hair extract | collected from each of these hair samples was performed one by one, and the average value of the load value at the time of the fracture | rupture of these 30 hairs was computed for every hair sample. The results are also shown in FIG. The average load values of Invention Example 14 and Comparative Examples 12 and 13 shown in FIG. 7 are pre-dyed using the hair pre-treatment agents of Invention Example 14 and Comparative Examples 12 and 13, respectively. The average load value at the time of breaking of the hair is shown.

As is apparent from FIG. 7, the hair collected from the hair sample pretreated with the hair dyeing pretreatment agent of Invention Example 14 has an average load value at break of 90. It was 38 g. On the other hand, the hair collected from the hair sample pretreated with the hair dyeing pretreatment agent of Comparative Example 12 had an average load value at break of 89.3 g in the tensile test. . Moreover, the hair collected from the hair sample pretreated with the hair dyeing pretreatment agent of Comparative Example 13 had an average load value at break of 87.6 g in the tensile test.

From these results, the hair cosmetic composition of the present invention containing an olefin (C14-16) sulfonic acid Na surfactant is used as a hair dyeing pretreatment agent, and then the hair is pre-treated to produce wool. The tensile strength of the hair is more effective than the pre-dyeing treatment using the pre-dyeing agent (Comparative Examples 12 and 13) containing a hydrolyzed keratin solution containing a keratin amino acid having a large average molecular weight. It can be easily recognized that it can be enhanced.

Next, three hair samples were subjected to the hair dyeing operation after performing the hair dyeing pretreatment as described above using three types of hair dyeing pretreatment agents (Invention Example 14, Comparative Examples 12 and 13). Each was left for 30 days in a state immersed in purified water. And the transition of the coloring of the purified water at that time was observed visually every 10 days. The results are shown in Table 7 below.

As is clear from Table 7, the purified water in which the hair sample pretreated with the hair dyeing pretreatment agent of Invention Example 14 was soaked was thinly colored even after 30 days. It was nothing more than On the other hand, the purified water in which the hair sample subjected to the hair dyeing pretreatment using the hair dyeing pretreatment agents of Comparative Example 12 and Comparative Example 13 was soaked was colored with a dark color after 30 days. did. This means that color loss after dyeing can be effectively prevented by performing pre-dyeing treatment on the hair using a pre-dyeing agent containing a keratin amino acid derived from human hair having a small average molecular weight. , Showing clearly.

Claims (6)

It contains a keratin amino acid derived from human hair having an average molecular weight of 90 to 200 and a surfactant, the content of the keratin amino acid is 0.1 to 20% by weight, and the pH value is 3 to 9 A hair cosmetic composition characterized by being adjusted to a value within the range of. The hair cosmetic composition according to claim 1, wherein the content of the surfactant is 1 to 60% by weight. The content of the keratin amino acid is 0.1 to 5.0% by weight, and the surfactant is an anionic surfactant and is used as a shampoo. Hair cosmetic composition. The hair according to claim 1 or 2, wherein the content of the keratin amino acid is 0.1 to 10% by weight, and the surfactant is a cationic surfactant and is used as a treatment. Cosmetic composition. The keratin amino acid content is 0.1 to 20% by weight, and the surfactant is either an anionic surfactant or a cationic surfactant, and is used as a permanent pretreatment agent. The hair cosmetic composition according to claim 1 or 2, wherein the composition is a hair cosmetic composition. The keratin amino acid content is 0.1 to 20% by weight, and the surfactant is any one of an anionic surfactant and a cationic surfactant, and is used as a hair dyeing pretreatment agent. The hair cosmetic composition according to claim 1 or 2, wherein the composition is a hair cosmetic composition.

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