JP2010090109A - Scalp hair treatment method and hair treatment kit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a treatment method which can heighten hair strength while imparting to the scalp hair wetness, moistness, and sufficient luster. <P>SOLUTION: Scalp hair treatment is performed by bringing a first hair treatment composition containing a keratin hydrolyzate into contact with the scalp hair and further bringing a second hair treatment composition containing keratin amino acid having a smaller weight-average molecular weight than the keratin hydrolyzate and having a pH adjusted to an acidic range into contact with the scalp hair still kept in contact with the first hair treatment composition. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a hair treatment method and a hair treatment kit, and in particular, a hair treatment method capable of obtaining a better treatment effect and a hair treatment comprising a hair treatment composition used in such a hair treatment method. It is about the kit.

  Usually, hair is constantly subjected to stress due to dirt, ultraviolet rays of the sun, and the like, and besides that, it is also subjected to severe stress by the heat of a hair dryer and beauty treatment such as perm and hair dye. And it is known that the hair damaged by such stress is in a dull state without moisture, a state lacking smoothness and luster, and the strength is reduced.

  Therefore, in general, after shampooing the hair, the hair is contacted (applied) so that the hair treatment composition is attached or adsorbed, and the hair is treated to protect the hair from damage caused by stress. In addition, restoration of damaged hair is attempted.

  And in recent years, in addition to general compounding ingredients such as moisturizing ingredients, soft ingredients, oily ingredients, antiseptic ingredients, etc., by treating hair using a hair treatment composition containing special ingredients, Attempts have been made to further improve the treatment effect by giving the hair a moist, moist, smooth feeling and sufficient luster. For example, it has been proposed to treat hair with a hair treatment composition comprising a keratin hydrolyzate having a large weight average molecular weight of 8000 or greater (e.g., measured by gel filtration) ( For example, see Patent Document 1 below).

  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, forming membranes, and repairing damage To demonstrate. Therefore, if a hair treatment composition containing such a keratin hydrolyzate is applied to the hair, for example, by contacting the hair to treat the hair, a higher treatment effect can be obtained. Moreover, in the conventional hair treatment composition used in such a treatment method, a keratin hydrolyzate contained therein is selected and used having a large weight average molecular weight of 8000 or more. When the composition is used, for example, in the form of an aqueous solution, the keratin hydrolyzate exhibits sufficiently high dispersibility in the aqueous solution, thereby improving the adsorptivity of the keratin hydrolyzate to the hair. Therefore, a high treatment effect can be exhibited more reliably.

  However, when the present inventors investigated in more detail the treatment effect obtained when treating hair using such a conventional hair treatment composition, the conventional hair containing keratin hydrolyzate was simply used. It became clear that it was difficult to increase the strength of damaged hair to such a degree that it could be satisfactorily satisfied with only the treatment composition.

International Publication No. 2005/095439 Pamphlet

  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 treatment method capable of effectively increasing the strength of the hair while applying it. Another object of the present invention is to provide a hair treatment kit that can be advantageously used in such a hair treatment method.

  As a result of various experiments conducted by the present inventor to solve such problems, keratin amino acids having a weight average molecular weight smaller than that of the keratin hydrolyzate contained in the conventional hair treatment composition are improved in hair strength. It turned out to be effective for improvement. However, until now, the keratin hydrolyzate having a small weight average molecular weight is poor in dispersibility and easily precipitated in the solution, so that it is contained as a component of the hair treatment composition used in the form of a solution such as an aqueous solution. Nothing was used. Accordingly, the present inventors have sought various measures to increase the dispersibility of keratin amino acids having a small weight average molecular weight. By adjusting the hair treatment composition containing keratin amino acids to an acidic range, a solution of such a hair treatment composition is obtained. It has been found that the dispersibility of keratin amino acids therein can be dramatically improved. In addition, a hair treatment composition containing a keratin hydrolyzate having a large weight average molecular weight, which has been generally used in the past, is brought into contact with the keratin having a small weight average molecular weight on the hair that remains attached. It has also been found that further contact with a hair treatment composition comprising an amino acid effectively improves the problem of reduced strength of damaged hair. Thus, the present invention has been completed as a result of further research conducted by the present inventor 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> (a) a step of bringing the first hair treatment composition containing a keratin hydrolyzate into contact with the hair; and (b) an acidic region containing a keratin amino acid having a weight average molecular weight smaller than that of the keratin hydrolyzate. And a step of further contacting the adjusted second hair treatment composition with the hair that is still in contact with the first hair treatment composition.

<2> The hair treatment method according to the above aspect <1>, wherein the hair is washed with a shampoo before bringing the first treatment composition into contact with the hair.

<3> The above aspect <1>, wherein after the second hair treatment composition is brought into contact with the hair that is still in contact with the first hair treatment composition, the hair is washed with a shampoo <1> > Or <2> The hair treatment method according to <2>.

<4> The hair, in which the first hair treatment composition and the second hair treatment composition are brought into contact with each other, is washed with a shampoo, and then the rinse composition is brought into contact with the hair. The hair treatment method according to the above aspect <3>.

<5> The hair treatment method according to the above aspect <4>, wherein the rinsing composition is brought into contact with the hair, the hair is rinsed, and then the hair is washed with a shampoo.

<6> The weight average molecular weight of the keratin hydrolyzate contained in the first hair treatment composition is a value within a range of 8000 to 20000, and the weight average molecular weight is contained in the second hair treatment composition. The hair treatment method according to any one of the above aspects <1> to <5>, wherein the weight average molecular weight of the keratin amino acid is a value in the range of 90 to 200.

<7> In any one of the above aspects <1> to <6>, the second hair treatment composition is adjusted to an acidic range in which the pH value is in the range of 2 to 6. The hair treatment method described.

<8> The content of the keratin hydrolyzate in the first hair treatment composition is 0.01 to 30% by weight, and the content of the keratin amino acid in the second hair treatment composition Is a hair treatment method according to any one of the above aspects <1> to <7>, wherein the content is 0.1 to 10% by weight.

<9> The keratin hydrolyzate in the first hair treatment composition is derived from feathers, and the keratin amino acid in the second hair treatment composition is derived from human hair. The hair treatment method according to any one of the above aspects <1> to <8>.

<10> The hair treatment method according to any one of the above aspects <1> to <9>, wherein the second hair treatment composition contains a surfactant.

<11> The first container for storing the first hair treatment composition used in the hair treatment method according to any one of the above aspects <1> to <10>, and the second A hair treatment kit comprising a second container separate from the first container in which the hair treatment composition is contained.

  That is, in the hair treatment method according to the present invention, first, the first hair treatment composition is brought into contact with the hair to hydrolyze keratin having a large weight average molecular weight contained in the first hair treatment composition. An object can be reliably attached to or adsorbed to the hair, so that it is possible to impart a moist and moist feeling, smoothness and sufficient gloss to the hair. The second hair treatment composition is then contacted with the second hair treatment composition against the hair with the first hair treatment composition still in contact (attached or adsorbed). The keratin amino acid having a small weight average molecular weight contained therein can be easily penetrated into the hair, and as a result, the strength of the hair can be effectively increased.

  Moreover, in the method of the present invention, since the second hair treatment composition is adjusted to the acidic range, the dispersibility of the keratin amino acid having a small weight average molecular weight contained in the second hair treatment composition is advantageously enhanced. Thus, the precipitation of keratin amino acid in the solution of the second hair treatment composition is advantageously eliminated, and the penetration of keratin amino acid into the hair is improved as well as the improvement of the usability of the second hair treatment composition. Therefore, the effect of improving the hair strength by keratin amino acid can be effectively ensured at a higher level.

  Therefore, according to the hair treatment method according to the present invention as described above, it is possible not only to effectively give moist and moist feeling, smoothness and sufficient gloss, but also to increase the strength of the hair. It is possible to increase the level reliably and stably at a higher level.

  Further, in the hair treatment kit according to the present invention, since the first hair treatment composition and the second hair treatment composition are each configured to include a container separately accommodated, these two types are used. The hair treatment composition can be easily used, whereby the hair treatment method that exhibits the excellent characteristics described above can be easily performed. Therefore, substantially the same actions and effects as those obtained by the hair treatment method can be easily and effectively enjoyed.

The respective tensile strengths of the hair sample treated with the first and second hair treatment compositions, the rinse composition and the shampoo composition obtained in Example 1 and the hair sample which has not been treated at all. It is a graph to show. Each of the hair sample obtained in Example 2 treated with the first and second hair treatment compositions and the shampoo composition without using the rinse composition, and the hair sample without any treatment. It is a graph which shows the tensile strength of. A hair sample obtained in Example 3 treated with the first hair treatment composition prior to the second hair treatment composition, and the second hair treatment composition as the first hair treatment composition. It is a graph which shows each tensile strength of the hair sample treated using before a thing.

  By the way, of the first and second types of hair treatment compositions used in the hair treatment method for hair according to the present invention, the first hair treatment composition is obtained by hydrolyzing keratin as an essential component. The keratin hydrolyzate is contained, and this keratin hydrolyzate effectively exerts hair protecting action, moisturizing action, repairing action and the like.

  As the keratin material for obtaining such a keratin hydrolyzate, for example, any material containing keratin such as nails, horns, hoofs, epidermis as well as animal hair such as wool, feathers of birds, human hair, etc. Is done. Such keratin materials also include secondary products obtained using the above materials, such as feather bedding and feather clothing, wool bedding and wool clothing, and the like. Among these keratin materials, one of the exemplified materials is used alone, or two or more of them are appropriately combined and used. Among such keratin materials, feathers are particularly preferably used. This is because a hydrolyzate obtained by using feathers as a keratin material is almost colorless and odorless, has no skin irritation, and exhibits excellent hair protection, moisturizing and repairing functions.

  As a method for hydrolyzing a keratin material, any conventionally known method can be adopted, and for example, a method disclosed in International Publication No. 2005/095439 is used. And since the keratin hydrolyzate which has a comparatively big weight average molecular weight of 8000-20000 among the keratin amino acids obtained by doing in this way is used suitably as an essential component of a 1st hair treatment composition. is there. Specific examples of such keratin hydrolyzate include “keratide” (trade name) manufactured by Toyo Feather Industries Co., Ltd.

  The reason why a keratin hydrolyzate having a weight average molecular weight of 8000 to 20,000 is suitable is as follows. That is, as described above, a keratin hydrolyzate having a small weight average molecular weight has low dispersibility in a solution of a composition containing the hydrolyzate. Therefore, if the keratin hydrolyzate contained in the first hair treatment composition has a relatively small weight average molecular weight of less than 8000, keratin hydrolysis in the solution of the first hair treatment composition The dispersibility of the product becomes low and the keratin hydrolyzate precipitates easily in such a solution, which not only makes the first hair treatment composition inferior to usability but also keratin hydrolysis. This is because the adsorptivity of the hair to the hair is lowered, and as a result, it may be difficult to sufficiently obtain the desired treatment effect by the hair protecting action, moisturizing action, and repairing action. On the other hand, even when the keratin hydrolyzate in the first hair treatment composition has a weight average molecular weight of more than 20000, the keratin hydrolyzate has an excessively large weight average molecular weight. There is a risk that the adsorptivity to the hair will be lowered, making it difficult to obtain a desired treatment effect sufficiently.

  Further, the content of the keratin hydrolyzate in the first hair treatment composition is not particularly limited, but is preferably a value within the range of about 0.1 to 30% by weight. This is because if the content of keratin hydrolyzate in the first hair treatment composition is less than 0.1% by weight, the content of keratin hydrolyzate in the first hair treatment composition is too low. For this reason, the hair protecting action, moisturizing action, repairing action and the like by the keratin hydrolyzate cannot be fully exhibited. Moreover, although the effect (treatment effect) by containing such a keratin hydrolyzate in the first hair treatment composition tends to be enhanced with an increase in the content of the keratin hydrolyzate, such an effect As the content of keratin hydrolyzate in the first hair treatment composition approaches 30% by weight, it gradually slows down, and when the content exceeds 30% by weight, Even if the content of the degradation product is increased, the enhancement of the effect due to the inclusion of the keratin hydrolyzate in the first hair treatment composition is hardly recognized. The soaring price becomes remarkable. Therefore, in order to sufficiently secure the effect obtained by containing the keratin hydrolyzate while suppressing the production cost of the first hair treatment composition, the keratin hydrolyzate in the first hair treatment composition It is preferable that the content is 0.1 to 30% by weight. In addition, it is more preferable that content of the keratin hydrolyzate in a 1st hair treatment composition shall be 1-20 weight%.

  In the first hair treatment composition, in addition to the keratin hydrolyzate having a large weight average molecular weight, an anionic surfactant, a cationic surfactant, a nonionic surfactant, an amphoteric surfactant, etc. Various components included in general hair treatment compositions such as various surfactants, moisturizers, oils, preservatives, and fragrances are included as optional components as long as the effects of the present invention are not impaired.

  On the other hand, the second hair treatment composition contains a keratin amino acid as an essential component, and this keratin amino acid has an effect of improving the strength of the hair in addition to the protective action, moisturizing action, repairing action, etc. of the hair. It comes to be demonstrated effectively.

  As the keratin material for obtaining such a keratin amino acid, any of the keratin materials exemplified above used for obtaining a keratin hydrolyzate contained in the first hair treatment composition can be used. . Even in such keratin materials, one of the exemplified materials may be used alone or in combination of two or more, but keratin amino acids may be used. In particular, human hair is suitably used alone as the keratin material for obtaining the above. This is because keratin amino acids derived from human hair exhibit an action to improve hair strength at a higher level than keratin amino acids obtained from keratin materials other than human hair.

  As a method for obtaining a keratin amino acid from these various keratin materials, various known methods including a method of hydrolyzing the keratin material can be adopted. Among the keratin amino acids thus obtained, keratin amino acid having a weight average molecular weight smaller than that of the keratin hydrolyzate contained in the first hair treatment composition is an essential component of the second hair treatment composition. Is used.

  In addition, although the weight average molecular weight of the keratin amino acid contained in a 2nd hair treatment composition is not specifically limited, Preferably it is set to the value within the range of about 90-200. This is because, when a keratin amino acid having a weight average molecular weight exceeding 200 is used, the permeability of such keratin amino acid into the hair is lowered, and the effect of improving the strength of the hair due to the penetration of the keratin amino acid is reduced. Because it ends up. In addition, when a keratin amino acid having an extremely small weight average molecular weight of less than 90 is used, the weight average molecular weight of the keratin amino acid is too small, so that the adsorptivity to hair is remarkably lowered, and this also provides sufficient hair strength. This is because improvement cannot be expected. Examples of keratin amino acids derived from human hair having a weight average molecular weight of 90 to 200 include, for example, valine, leucine, isoleucine, phenylalanine, proline, serine, threonine, tyrosine, aspartic acid, glutamic acid, arginine, lysine, histidine, methionine. And the like alone or a mixture thereof.

  And the 2nd hair treatment composition containing such a keratin amino acid will be used, for example as aqueous solution, but this 2nd hair treatment composition must be adjusted to the acidic region. This is because the second hair treatment composition has a low weight average molecular weight that has not been used in the past because of its poor dispersibility in the solution of the hair treatment composition. Keratin amino acid (weight average molecular weight smaller than the keratin hydrolyzate contained in the hair treatment composition) is contained, but this keratin amino acid has high dispersibility only in the solution of the composition adjusted to the acidic range. This is because will come to be demonstrated.

  The specific pH value of the second hair treatment composition adjusted to this acidic range is not particularly limited, but preferably the pH value is in the range of about 2 to 6. The This is because if the pH value of the second hair treatment composition exceeds 6, the second hair treatment composition becomes weakly acidic and keratin in the second hair treatment composition (in solution) This is because it may be difficult to ensure sufficient dispersibility of amino acids, and when the pH value is less than 2, it is difficult to form treatment properties, and there is a risk of damaging hair. This is because there is a concern of causing a problem such as. The pH value of the second hair treatment composition is more preferably set to a value in the range of 4.0 to 5.5. The pH value of the second hair treatment composition can be adjusted, for example, by adjusting the concentration of each of various components that show acidity or alkalinity, or by adding a known pH adjuster to the second hair treatment composition. It is carried out by adding or the like.

  Further, the content of the keratin amino acid in the second hair treatment composition is not limited at all, but is preferably a value within the range of about 0.1 to 10% by weight. This is because if the content of keratin amino acid in the second hair treatment composition is less than 0.1% by weight, the content of keratin amino acid in the second hair treatment composition is too small, This is because the effect of improving the strength of hair by amino acids cannot be fully exhibited. In addition, the effect of improving the strength of hair exhibited by the inclusion of such keratin amino acids in the second hair treatment composition tends to be enhanced with an increase in the content of keratin amino acids. The degree of enhancement gradually decreases as the keratin amino acid content in the second hair treatment composition approaches 10% by weight, and when the content exceeds 10% by weight, the keratin amino acid content increases. Increase in the strength of the hair due to the inclusion of keratin amino acid in the second hair treatment composition is hardly recognized, but on the contrary, the cost increase due to the increase in the amount of keratin amino acid used is remarkable It becomes. Therefore, in order to sufficiently secure the effect of improving the strength of the hair obtained by containing the keratin amino acid while suppressing the production cost of the second hair treatment composition, the keratin amino acid in the second hair treatment composition It is preferable that the content is 0.1 to 10% by weight. In addition, it is more preferable that content of the keratin amino acid in a 2nd hair treatment composition shall be 1.0 to 5.0 weight%.

  In the second hair treatment composition, in addition to the keratin amino acid having a small weight average molecular weight, as in the first hair treatment composition, an anionic surfactant, a cationic surfactant, and a nonionic surfactant are used. Various components included in a general hair treatment composition such as various surfactants such as an agent and an amphoteric surfactant, a moisturizer, an oil agent, a preservative, and a fragrance are included as optional components. In particular, by containing various surfactants, the dispersibility of keratin amino acids having a small weight average molecular weight can be more effectively enhanced.

  Thus, a first hair treatment composition comprising a keratin hydrolyzate having a large weight average molecular weight and a second hair treatment composition comprising a keratin amino acid having a smaller weight average molecular weight than such keratin hydrolyzate, For example, it is made of synthetic resin or glass, and each is housed in different containers, and these two types of hair treatment compositions are made into one set as they are or in a predetermined case. After being packaged, it will be generally provided as a hair treatment kit. Thereby, the distribution pattern of the first hair treatment composition and the second hair treatment composition can be optimized. In addition, both the first hair treatment composition and the second hair treatment composition can be easily obtained by the user, and a method for treating hair using these two types of hair treatment compositions is provided. It can be implemented easily and reliably.

  By the way, when the hair treatment is performed using the first hair treatment composition and the second hair treatment composition as described above, for example, the operation is advanced according to the following procedure. .

  That is, first, the hair to be treated is washed with a shampoo, and then towel-dried to remove moisture adhering to the hair. In addition, the kind of shampoo composition used here is not limited at all, and is appropriately selected from known shampoo compositions.

  Thereafter, the first hair treatment composition is brought into contact with and adhered to the hair washed with the shampoo. Any method may be used to bring the first hair treatment composition into contact with the hair and attach it to the hair, for example, after an appropriate amount of the first hair treatment composition is placed on the hair or palm, Alternatively, using a comb or brush, the first hair treatment composition may be applied to the hair while being stretched (expanded), or attached to the hair, or using a spray device or the like. A method of spraying the composition on the hair and attaching it to the hair is employed. In addition, the amount of the first hair treatment composition used here may be an amount that allows the first hair treatment composition to adhere to the entire hair. According to the length and amount of hair to be determined, it is determined appropriately.

  Then, after the first hair treatment composition is attached to the entire hair, after the hair has been squeezed so that the first hair treatment composition is sufficiently distributed over the entire hair, the hair treatment composition is applied for about 3 to 5 minutes. put. Accordingly, the first hair treatment composition is made to conform to the hair, and the keratin hydrolyzate contained in the first hair treatment composition is surely and sufficiently adsorbed to the entire hair. Thus, the hair protecting action, moisturizing action and repairing action by the keratin hydrolyzate are effectively exerted on the hair.

  Next, the second hair treatment composition is further brought into contact with the hair with the first hair treatment composition still adhered to adhere to the entire hair. This allows the keratin amino acid contained in the second hair treatment composition to penetrate into the hair. Therefore, in addition to the hair protecting action, moisturizing action and repairing action by the keratin amino acid, the hair strength improving action is effectively exerted on the hair.

  In addition, the method similar to the method of making a 1st hair treatment composition contact hair is employ | adopted as the method of making a 2nd hair treatment composition contact hair and making it adhere. The amount of the second hair treatment composition used is also appropriately determined according to the length and amount of the hair to be treated so that the second hair treatment composition can adhere to the entire hair. The

  Then, when the second hair treatment composition is uniformly attached to the entire hair, the hair is washed with shampoo, and the first hair treatment composition and the second hair treatment composition attached to the hair are washed. Wash away. The shampoo composition used here is not particularly limited.

  Then, after wiping off moisture with a towel, if necessary, the rinse composition is brought into contact with the hair and adhered. As a result, the rinsing composition exerts an oil replenishing action on the hair surface and a hair flexibility improving action. In addition, the kind of rinse composition used here is not limited at all, and it selects from a well-known rinse composition suitably, and is used.

  When the rinse composition is brought into contact with the hair, the hair is rinsed and then washed with shampoo. Any known shampoo composition can be used.

  In this way, after the first hair treatment composition is brought into contact with and attached to the hair, the second hair treatment composition is brought into contact with the hair with the first hair treatment composition still attached. By adhering, the hair protecting effect, moisturizing effect and restorative effect of the keratin hydrolyzate contained in the first hair treatment composition are effectively exhibited, and in addition, the second hair treatment composition The effect of improving the strength of hair by the keratin amino acid contained in is sufficiently exhibited. Therefore, not only can moist, moist, smooth and sufficient gloss be effectively imparted to the hair, but the strength of the hair can be reliably and stably increased at a higher level. It will be.

  In addition, by washing the hair with a shampoo before the first hair treatment composition is brought into contact with the hair, the dirt on the hair is sufficiently removed before the treatment for the hair is performed. As a result, the treatment effect by using the first and second hair treatment compositions can be more sufficiently obtained.

  Further, after the first hair treatment composition and the second hair treatment composition are brought into contact with and attached to the hair, the first and second hair treatment compositions are washed by shampooing the hair. In particular, the second hair treatment composition having a high viscosity is surely washed away. As a result, it is possible to effectively eliminate the occurrence of stickiness of the hair caused by the second hair treatment composition being left on the hair without being washed off.

  Furthermore, by using the first and second hair treatment compositions, the rinsing composition is further brought into contact with the treated hair, so that the rinsing composition can replenish oil to the hair surface and the hair. Based on the action of improving the flexibility of the hair, the supple and soft feel of the hair can be effectively enhanced.

  Furthermore, after rinsing the hair after such a rinsing composition is in contact with the hair, the rinsing composition is then washed away by washing the hair with a shampoo. As a result, the occurrence of stickiness of the hair caused by leaving the rinse composition attached to the hair without being washed off can be effectively eliminated.

  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.

<Preparation of sample>
First, as a keratin material for obtaining a keratin hydrolyzate, feathers of waterfowl were used and hydrolyzed according to the method described in International Publication No. 2005/095439 pamphlet. : Keratide, Toyo Feather Industrial Co., Ltd.) was prepared in a predetermined amount. When the weight average molecular weight of this keratin hydrolyzate was measured by the well-known gel filtration method, the value was 9074. In addition, the measurement conditions of the weight average molecular weight by the gel filtration method are as follows.
Column: G2000SWXL 7.8 × 300 mm (manufactured by Tosoh Corporation)
Mobile phase: 0.1M phosphate buffer pH 6.8 (containing 0.3M NaCl)
・ Flow rate: 0.6mL / min
-Column temperature: 40 ° C
・ Detector: UV230nm
・ Molecular weight marker: Aldolase (Mw 158,000)
: Bovine serum albumin (Mw 68,000)
: Ovalbumin (Mw 45,000)
: Chymotrypsinogen (Mw 25,000)
: Cytochrome (Mw1,500)
: Insulin (Mw5,500)

In addition to the keratin hydrolyzate described above, human hair was used as a keratin material for obtaining keratin amino acids, and a predetermined amount of keratin amino acids derived from human hair obtained by hydrolyzing this using a known technique was prepared. When the weight average molecular weight of the keratin amino acid was measured by a known gel filtration method in the same manner as the method for measuring the weight average molecular weight of the keratin hydrolyzate, the value was between 90 and 200. In addition, the measurement conditions of the weight average molecular weight by the gel filtration method are as follows.
Column: Shodex KW-803 (manufactured by Showa Denko KK)
-Mobile phase: 0.05M phosphate buffer pH 7.0 (containing 0.1M NaCl)
・ Flow rate: 1.0 mL / min
-Column temperature: 40 ° C
・ Detector: Optilab DSP (RI), miniDAWN
・ Molecular weight marker: Insulin (Mw500)

  Next, according to the composition shown in Table 1 below, four types of first hair treatment compositions having different keratin hydrolyzate contents were prepared. And among those four types of first hair treatment compositions, the keratin hydrolyzate content is 0.01% by weight, and the first hair treatment composition A is 1.0% by weight. Is the first hair treatment composition B, 5.0 wt% is the first hair treatment composition C, and 10 wt% is the first hair treatment composition D.

  In addition to these four types of first hair treatment compositions A to D, three types of second hair treatment compositions having different keratin amino acid contents were prepared according to the composition shown in Table 2 below. . Of these three types of second hair treatment compositions, those having a keratin amino acid content of 0.1% by weight are second hair treatment compositions A and those having 1.0% by weight. The second hair treatment composition C, which was 5.0% by weight, was designated as the second hair treatment composition C. For these three types of second hair treatment compositions A to C, the pH value of each composition is adjusted to 5.0 by adding lactic acid in a predetermined amount as a pH adjuster. did.

  Further, a rinse composition was prepared according to the composition shown in Table 3 below.

<Example 1>
Then, each of the four types of the first hair treatment compositions A to D and the three types of the second hair treatment compositions A to C thus prepared is combined in 12 combinations shown in Table 4 below. Further, a hair sample (hair bundle) of human hair was treated according to the following procedure using a rinse composition prepared separately from the shampoo composition. In Table 4 below, 12 combinations are shown as combinations 1 to 12, respectively.

  In performing the treatment on the hair sample, first, the hair sample was washed with a shampoo composition, and then towel drying was performed by wiping off moisture with a towel. Subsequently, the first hair treatment composition was sprayed on the entire hair sample using a spray bottle, and after further impregnating the hair, it was left for 3 to 5 minutes. Subsequently, after the second hair treatment composition is applied to the entire hair sample on which the first hair treatment composition is adhered, the hair is washed with the shampoo composition, and the first hair adhered to the hair is then washed. The treatment composition and the second hair treatment composition were washed away, and then towel drying was performed on the hair sample. The rinse composition was then applied to the entire hair sample, rinsed, and then the hair sample was again washed with the shampoo composition. Thereafter, the hair sample was dried using a warm air dryer, and thus the treatment for the hair sample was completed.

  Then, in the 12 different combinations (combinations 1 to 12), the first hair treatment composition and the second hair treatment composition are used, and the rinse composition and the shampoo composition are used. In order to examine the strength of each of the hair samples treated with the first, randomly from the hair samples treated with the first hair treatment composition and the second hair treatment composition according to combination 1 A plurality of hairs having the same diameter of 0.08 mm were cut out. 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 to examine the load value at the time of breakage of each hair. And the average value of the load value at the time of the fracture | rupture in each of those 30 hairs was computed. The results are shown in FIG.

  Also, according to combinations 2 to 12, using the first hair treatment composition and the second hair treatment composition, and using the rinse composition and the shampoo composition, each of the 11 types of treated hair samples was used. The cut hair was also subjected to a tensile test in the same manner as described above, the load at each break was examined, and the average value was calculated for each hair sample. Further, for comparison, a plurality of hairs cut from a hair sample that has not been subjected to any treatment as described above are also subjected to a tensile test in the same manner as described above to determine the load at each break. Further, the average value was calculated. The results are also shown in FIG. In addition, as for each average load value of the invention examples 1-12 shown by FIG. 1, according to the combination 1-12, the 1st and 2nd hair treatment composition, the rinse composition, and the shampoo composition are used, The average load value at the time of breakage of the treated hair is shown. Moreover, the average load value of the comparative example 1 shows the average load value at the time of the fracture | rupture of the untreated hair which is not treated at all.

  As is clear from FIG. 1, the hair collected from the hair sample that had not been treated at all had an average value of the load value at the time of breaking by the tensile test (comparative example value) of 95.78 g. In contrast, any one of the first hair treatment compositions A to D containing a keratin hydrolyzate and a keratin amino acid having a weight average molecular weight smaller than that of the keratin hydrolyzate and adjusted to an acidic range The hair collected from the hair sample treated with any one of the two hair treatment compositions A to C has a minimum load value (values of Invention Examples 1 to 12) at the time of breaking by the tensile test. The maximum was 114.90 g, and the maximum was 140.32 g. This clearly shows that the hair strength is improved by treating the hair according to the method of the present invention.

  In addition, from the results shown in FIG. 1, along with an increase in the content of keratin hydrolyzate in the first hair treatment composition and an increase in the content of keratin amino acids in the second hair treatment composition, It can be recognized that the effect of improving the strength of the hair is increased.

<Example 2>
Next, in order to examine the effect of improving the strength of the hair when the hair treatment is not performed after the hair treatment using the first hair treatment composition and the second hair treatment composition, The following tests were conducted.

  That is, first, after the hair sample was washed with the shampoo composition prepared in Example 1, towel drying was performed by wiping off moisture with a towel. Subsequently, the first hair treatment composition C prepared in Example 1 was sprayed on the entire hair sample using a spray bottle, and after the hair was absorbed, the hair was left for 3 to 5 minutes. Subsequently, after the second hair treatment composition C prepared in Example 1 was applied to the entire hair sample with the first hair treatment composition C still adhered, the shampoo composition prepared in Example 1 was applied. Then, the hair sample was washed again, and the first hair treatment composition C and the second hair treatment composition C adhering to the hair were washed away. Thereafter, towel drying was performed on the hair sample, and then the hair sample was dried using a warm air dryer, thereby completing the treatment on the hair sample.

  And after collecting a plurality of hairs from the hair sample thus treated, in the same manner as in Example 1, a tensile test is performed on the hairs, the load at each breakage is examined, and the average value is further obtained. Was calculated. The results are shown in FIG. The average load value of Invention Example 13 shown in FIG. 2 is as described above when the hair treated with the first hair treatment composition C and the second hair treatment composition C is broken. The average load value is shown. Moreover, the average load value of the comparative example 1 shows the average load value at the time of the fracture | rupture of the untreated hair which is not treated at all.

  As is clear from FIG. 2, the hair collected from the hair sample not subjected to any treatment had an average value of the load value at the time of breakage by the tensile test (comparative example value) of 95.78 g. On the other hand, the hair collected from the hair sample treated with the first hair treatment composition C and the second hair treatment composition C is an average value of the load value at the time of breaking by the tensile test ( The value of Invention Example 13) was 132.51 g. Thus, according to the method of the present invention, a first hair treatment composition containing a keratin hydrolyzate and a second hair treatment adjusted to an acid containing a keratin amino acid having a weight average molecular weight smaller than that of the keratin hydrolyzate It can be clearly recognized that if the hair is treated with the composition, the effect of improving the strength of the hair can be sufficiently ensured without using the rinse composition.

  In Example 1, the hair collected from the hair sample treated with the rinse composition in addition to the first hair treatment composition C and the second hair treatment composition C was The average value of the load values (value of Invention Example 9) is 137.88 g, which is slightly larger than the value of Invention Example 13 described above. This indicates that the strength of the hair can be increased by treating the hair with a rinse composition in addition to the first and second hair treatment compositions. .

<Example 3>
Next, in order to investigate the effect of improving the strength of the hair when the hair treatment was performed by changing the order of use of the first hair treatment composition and the second hair treatment composition, the following tests were conducted. .

  That is, first, using the previously prepared keratin hydrolyzate and keratin amino acid, according to the compositions shown in the following Tables 5 and 6, respectively, the first hair treatment composition E containing the keratin hydrolyzate and A second hair treatment composition D containing keratin amino acids was prepared respectively.

  First, the hair sample was washed with the shampoo composition prepared in Example 1, and then towel drying was performed by wiping off moisture with a towel. Next, the second hair treatment composition D was sprayed on the entire hair sample by using a spray bottle, and after the hair was absorbed, the hair was left for 3 to 5 minutes. Subsequently, after applying the first hair treatment composition E to the entire hair sample on which the second hair treatment composition D is adhered, the hair sample is again applied with the shampoo composition prepared in Example 1. After washing, the second hair treatment composition D and the first hair treatment composition E adhering to the hair were washed away. Thereafter, towel drying was performed on the hair sample, and then the hair sample was dried using a warm air dryer, thereby completing the treatment on the hair sample.

  And after collecting a plurality of hairs from the hair sample thus treated, in the same manner as in Example 1, a tensile test is performed on the hairs, the load at each breakage is examined, and the average value is further obtained. Was calculated. The results are shown in FIG. In addition, in Example 2, the average load value of Invention Example 14 shown in FIG. 3 is the same as that of the first hair treatment composition C (the content of the keratin hydrolyzate is 5 as in the first hair treatment composition E). 0.0% by weight) and the second hair treatment composition C (the content of keratin amino acid is 5.0% by weight, the same as the second hair treatment composition D), and the former in order. The average load value at the time of breakage of the hair used in the treatment is shown. In addition, the average load value of Comparative Example 2 is the average load at the time of breakage of the hair treated with the first hair treatment composition E and the second hair treatment composition D using the latter in the previous order. Indicates the value.

  As is clear from FIG. 3, the hair treated using the second hair treatment composition D before the first hair treatment composition E is the average value of the load values at the time of breakage in the tensile test (comparison). The value of Example 2) was 124.98 g. On the other hand, the hair collected from the hair sample treated using the first hair treatment composition C before the second hair treatment composition C has an average load value at the time of breakage by the tensile test. The value (value of Invention Example 14) was 132.51 g.

  This is because, according to the method of the present invention, first, a first hair treatment composition containing a keratin hydrolyzate is contacted with hair, and then contains an acidic keratin amino acid having a weight average molecular weight smaller than that of the keratin hydrolyzate. Treating the hair with the second hair treatment composition adjusted to the hair in the reverse order, rather than treating the hair with the first and second hair treatment compositions in the reverse order It clearly shows that a high effect can be obtained in improving the strength.

<Example 4>
Next, prepare multiple types of keratin hydrolyzate, which is a raw material used for the first hair treatment composition, and keratin amino acid, which is a raw material used for the second hair treatment composition. In order to examine the effect of improving the strength of hair in various combinations, the following tests were conducted.

  First, two types of keratin hydrolysates were prepared as keratin hydrolysates used in the first hair treatment composition. That is, the same keratin hydrolyzate used in <Example 1> to <Example 3> described above, derived from feathers and having a weight average molecular weight of 8000 to 20000, keratin hydrolyzate A (trade name: Keratide, Toyo Feather) Kelatin hydrolyzate B having a weight average molecular weight of 100,000 derived from wool. On the other hand, the following two types of keratin amino acids were prepared as keratin amino acids used in the second hair treatment composition. That is, the same keratin amino acid used in <Example 1> to <Example 3>, derived from human hair and having a weight average molecular weight of 90 to 200, and keratin amino acid having a weight average molecular weight of 400 derived from wool B. These two types of keratin hydrolysates A and B and keratin amino acids A and B were used in the test in the four combinations shown in Table 7 below. The keratin amino acids A and B are both adjusted to the acidic range.

  As hair samples (human hair) used in the test, 5 bundles of hair bundles were selected by selecting 20 hairs having a diameter of 0.08 mm from the sample bundle. Then, according to the combinations shown in Table 7 above, four of the prepared hair bundles are first immersed in keratin hydrolyzate A or B for 10 minutes, then left in the air for 10 minutes, and further, keratin amino acid A or I was immersed in B for 10 minutes. After these immersion treatments, the hair bundle was rinsed with water and dried using a hot air dryer. After repeating the above steps 5 times each, under the environment of temperature: 23 ° C. and humidity: 60%, a known hair tension tester [KES-G1-SH high sensitivity hair tension tester manufactured by Kato Tech Co., Ltd.] A tensile test using the hair was performed, and the load value at the time of breakage of each of the 20 hairs in each hair bundle was examined. Further, as a comparative example, a similar tensile test was performed on a hair bundle in which only rinsing with water and hot air drying were repeated 5 times each. The results are shown in Table 8 below. In addition, in order to standardize the test results, the numerical values for three times from the highest value and three times from the lowest value are deleted.

  From the results shown in Table 8, as a combination of the keratin hydrolyzate and keratin amino acid used in the method of the present invention, keratin hydrolyzate A having a weight average molecular weight of 8000 to 20000 (trade name: Keratide, Toyo Feather) It can be seen that a combination of Kogyo Kogyo Co., Ltd.) and keratin amino acid A having a weight average molecular weight of 90 to 200 derived from human hair is particularly suitable.

Claims (11)

Contacting the hair with a first hair treatment composition comprising a keratin hydrolyzate;
A second hair treatment composition adjusted to an acidic range containing a keratin amino acid having a weight average molecular weight smaller than that of the keratin hydrolyzate is applied to the hair that has been kept in contact with the first hair treatment composition. And further contacting step,
A method for treating hair, comprising the step of:   The hair treatment method according to claim 1, wherein the hair is washed with a shampoo before contacting the first treatment composition with the hair.   3. The hair is washed with a shampoo after the second hair treatment composition is brought into contact with the hair that is still in contact with the first hair treatment composition. The hair treatment method according to 1.   The rinsing composition is brought into contact with the hair after washing the hair in contact with the first hair treatment composition and the second hair treatment composition with a shampoo. Item 4. A hair treatment method according to Item 3.   The hair treatment method according to claim 4, wherein after the rinsing composition is brought into contact with the hair, the hair is rinsed, and then the hair is washed with a shampoo.   The weight average molecular weight of the keratin hydrolyzate contained in the first hair treatment composition is a value within the range of 8000 to 20000, and the keratin amino acid contained in the second hair treatment composition. The hair treatment method according to any one of claims 1 to 5, wherein the weight average molecular weight is a value within a range of 90 to 200.   The hair treatment according to any one of claims 1 to 6, wherein the second hair treatment composition is adjusted to an acidic range in which a pH value is in a range of 2 to 6. Method.   The content of the keratin hydrolyzate in the first hair treatment composition is 0.01 to 30% by weight, and the content of the keratin amino acid in the second hair treatment composition is 0. The hair treatment method according to any one of claims 1 to 7, wherein the hair treatment method is 1 to 10% by weight.   2. The keratin hydrolyzate in the first hair treatment composition is derived from feathers, and the keratin amino acid in the second hair treatment composition is derived from human hair. The hair treatment method according to any one of claims 8 to 9.   The hair treatment method according to any one of claims 1 to 9, wherein the second hair treatment composition contains a surfactant.   The 1st container in which said 1st hair treatment composition used for the hair treatment method of any one of said Claim 1 thru | or 10 is accommodated, and said 2nd hair treatment composition A hair treatment kit comprising a second container separate from the first container in which an object is stored.

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