Hair treatment composition

Abstract

To provide a hair treatment composition for thickening hair and / or repairing the surface of hair. The present invention provides a hair treatment composition for thickening hair and / or repairing the surface of hair, which contains a cationic surfactant and / or glyoxylic acid as an active ingredient. The present invention also provides a method for thickening hair and / or repairing the surface of hair, which comprises applying such a composition to hair.

Description

[Technical field]

[0001] The present invention relates to a hair treatment composition, in particular to a hair treatment composition for thickening hair and / or repairing the hair surface. [Background technology]

[0002] Many people have hair problems such as thin hair and a lack of volume due to various factors such as genetic factors, aging, changes in hormone levels, etc. Therefore, there is a demand for hair that can be made thicker by thickening each individual hair to increase the volume of the entire head of hair.

[0003] A hair treatment agent containing a protein as an active ingredient has been proposed for the purpose of thickening hair (Patent Document 1). However, this hair treatment agent is a combination of two agents, a reducing agent and an oxidizing agent, and it is time-consuming to treat hair. A resin composition for making hair look thick has also been disclosed (Patent Document 2), but it is washed away after washing the hair, so it needs to be applied every time. Furthermore, a hair treatment agent containing a multi-chain multi-hydrophilic group type compound such as an anionic surfactant has been disclosed for improving hair thickness (Patent Document 3). However, anionic surfactants have the disadvantage of removing lipids and proteins from hair and damaging the hair (Patent Documents 4 and 5). Here, there is a strong demand for a new composition or method that does not have the above-mentioned disadvantages and is highly effective in thickening hair and / or repairing the surface of hair. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2007-91739 A [Patent Document 2] Patent No. 4812958 [Patent Document 3] JP 2006-56874 A [Patent Document 4] JP 2007-153779 A [Patent Document 5] JP 2007-217433 A [Patent Document 6] Patent No. 5947340 [Patent Document 7] Patent No. 6122942 Summary of the Invention [Problem to be solved by the invention]

[0005] It is an object of the present invention to provide a hair treatment composition for thickening hair and / or repairing the surface of hair.

[0006] The present inventors have conducted extensive research into the effects of various ingredients in thickening hair and / or repairing the surface of hair, and as a result have discovered for the first time that cationic surfactants and glyoxylic acid are particularly effective, leading to the completion of the present invention.

[0007] Specifically, the present invention relates to the following inventions: (1) A composition for thickening hair and / or repairing the surface of hair, comprising: The composition contains a cationic surfactant and / or glyoxylic acid as an active ingredient. (2) The cationic surfactant is The following formula (I): [ka] (In the formula, R 1 , R 2 , R 3 and R 4 may be the same or different, and at least one of them is a linear or branched alkyl or alkenyl group having 8 to 18 carbon atoms, or R 5 -OR 6 -(In the formula, R 5 represents a linear or branched alkyl or alkenyl group having 8 to 18 carbon atoms; R 6represents an ethylene group or a propylene group), and the other groups represent a hydrogen atom or an alkyl group having 1 to 3 carbon atoms which may be substituted with a hydroxyl group or a benzyl group, and X - indicates anion) The composition according to (1), wherein the ammonium salt is represented by the formula: (3) The ammonium salt is The following formula (II): [ka] (In the formula, R 1 , R 2 , R 3 and R 4 may be the same or different, at least one of which represents a linear or branched alkyl or alkenyl group having 8 to 18 carbon atoms, and the others represent an alkyl or benzyl group having 1 to 3 carbon atoms which may be substituted with a hydroxyl group, X - indicates anion) The composition according to (2), wherein the quaternary ammonium salt is represented by the formula: (4) The composition according to (3), wherein the quaternary ammonium salt is one or a combination of a plurality of quaternary ammonium salts selected from octyltrimethylammonium chloride, decyltrimethylammonium chloride, lauryltrimethylammonium chloride, myristyltrimethylammonium chloride, cetyltrimethylammonium chloride, stearyltrimethylammonium chloride, and dilauryldimethylammonium chloride. (5) The composition according to any one of (1) to (4), wherein the content of the cationic activator is 0.01 to 5% by weight. (6) The composition according to (1), wherein the amount of glyoxylic acid is 1 to 25% by weight. (7) The composition according to any one of (1) to (6), wherein the pH of the composition is within the range of 2 to 9. (8) The composition according to any one of (1) to (7), wherein the composition is applied to hair for 1 minute to 1 week. (9) The composition according to any one of (1) to (8), wherein the hair is heated after the composition is applied to the hair. (10) The composition according to (9), wherein the heating temperature is 150°C or higher. (11) A cosmetic or therapeutic method for thickening hair and / or repairing the surface of hair, comprising: The method comprises applying the composition according to any one of (1) to (10) to hair. (12) The method according to (11), further comprising heating the hair after applying the composition to the hair. (13) The method according to (12), wherein the heating temperature is 150°C or higher. Effect of the Invention

[0008] The compositions of the present invention, which include a cationic surfactant and / or glyoxylic acid, can thicken hair and / or repair the surface of hair. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 shows an example of hair having a smooth cross-sectional shape. [Diagram 2] FIG. 2 shows an example of hair with a smooth surface. [Diagram 3] FIG. 3 shows an example of hair with unevenness in its cross-sectional shape. [Figure 4] FIG. 4 shows an example of hair with unevenness on its surface. [Diagram 5] Figure 5 shows the hair diameter increasing effect of various surfactants. * indicates a significant difference from the control containing no surfactant by Student's t-test (*p<0.05, ***p<0.001). [Figure 6] Figure 6 shows the hair diameter increasing effect due to different types of cationic surfactants. * indicates a significant difference from the control containing no surfactant by Student's t-test (*p<0.05, ***p<0.001). [Figure 7] Figure 7 shows the hair diameter increasing effect due to the difference in carbon chain length of cationic surfactants. * indicates a significant difference from the control containing no surfactant by Student's t-test (*p<0.05, ***p<0.001). [Figure 8] FIG. 8 shows the hair diameter increasing effect due to differences in pH of the LTC composition. [Figure 9] FIG. 9 shows the effect of increasing hair diameter due to differences in LTC concentration. [Figure 10] FIG. 10 shows the effect of increasing the hair diameter depending on the immersion time in the LTC composition. [Figure 11] 11 shows the hair diameter increasing effect of glyoxylic acid. * indicates a significant difference from the control not containing glyoxylic acid by Student's t-test (***p<0.001). DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] The present inventors have conducted extensive research to discover ingredients that thicken hair, and as a result, have discovered that cationic surfactants and glyoxylic acid are particularly effective. The composition of the present invention, which contains a cationic surfactant and / or glyoxylic acid as an active ingredient, can expand hair from the inside and increase the hair diameter. By thickening hair, it is possible to improve the elasticity and stiffness of hair and increase the overall volume of hair.

[0011] The present inventors have also found that the disorder of the cross-sectional shape of hair is involved in the feel of hair. Healthy hair, for example, as shown in Figures 1 and 2, has a smooth cross-sectional shape and surface, so it feels good to the touch, while the present inventors have found that if the cross-sectional shape or surface of hair is uneven, the hair loses its smoothness, becomes dry, and feels bad to the touch, as shown in Figures 3 and 4. In addition, the present inventors have also found that healthy hair, for example, as shown in Figure 2, reflects light without scattering, so it shows good luster, but if the cross-sectional shape is disordered and the surface is uneven, as shown in Figure 4, the light is scattered, so the luster is deteriorated. However, the composition of the present invention, which contains a cationic surfactant and / or glyoxylic acid as an active ingredient, can repair the surface of hair by swelling the hair from the inside. By repairing the surface of hair, it is possible to improve the smoothness and luster of hair and reduce dryness.

[0012] In the present invention, "thickening hair" refers to increasing the thickness of each individual hair. For example, it refers to increasing the diameter of the hair in a cross-sectional view as shown in FIG. 1. The diameter (hair diameter) of the hair may be measured under a microscope after fixing the hair so that the observation angle is constant before and after application of the composition, as described in the Examples. For example, the effect of the composition of the present application to thicken the hair diameter may be determined by measuring the hair diameter before and after application of the composition of the present application, and if the hair diameter after application is increased by, for example, 0.1% or more, 0.2% or more, 0.3% or more, 0.4% or more, 0.5% or more, 1% or more, 2% or more, 3% or more, 4% or more, 5% or more, 6% or more, 7% or more, 8% or more, 9% or more, or 10% or more compared to before application, the composition of the present application may be determined to have the effect of thickening the hair diameter. In addition, in the present invention, "thickening hair" may also refer to, for example, increasing the cross-sectional area of ​​the hair in a cross-sectional view as shown in FIG. 1 or FIG. 3.

[0013] In the present invention, "repairing the hair surface" refers to smoothing out unevenness or disorder on the hair surface, for example, as shown in Figure 3 or Figure 4. For example, it may refer to bringing the surface into a state as shown in Figure 1 or Figure 2, but the degree of repair of the unevenness or disorder on the hair surface is not necessarily limited.

[0014] The cationic surfactant of the present invention refers to a surfactant exhibiting cationic properties. Surfactant is a general term for a substance having a hydrophilic group and a hydrophobic group. Surfactants are classified as anionic, cationic, amphoteric, and nonionic, and cationic surfactants (cationic surfactants) are often used in hair rinses and conditioners to impart flexibility to hair (Patent Documents 4 and 5). However, it was not known that cationic surfactants have the effect of thickening hair or repairing the disorder of the cross-sectional shape of hair.

[0015] Particularly preferred cationic surfactants are The following formula (I): [ka] (In the formula, R 1 , R2 , R 3 and R 4 may be the same or different, and at least one of them is a linear or branched alkyl or alkenyl group having 8 to 18 carbon atoms, or R 5 -OR 6 -(In the formula, R 5 represents a linear or branched alkyl or alkenyl group having 8 to 18 carbon atoms; R 6 represents an ethylene group or a propylene group), and the other groups represent a hydrogen atom or an alkyl group having 1 to 3 carbon atoms which may be substituted with a hydroxyl group or a benzyl group, and X - indicates anion) It is an ammonium salt represented by the formula:

[0016] For example, the cationic surfactant of the present invention may be The following formula (II): [ka] (In the formula, R 1 , R 2 , R 3 and R 4 may be the same or different, at least one of which represents a linear or branched alkyl or alkenyl group having 8 to 18 carbon atoms, and the others represent an alkyl or benzyl group having 1 to 3 carbon atoms which may be substituted with a hydroxyl group, X - represents an anion) can be preferably used.

[0017] Examples of the quaternary ammonium salt of formula (II) include octyltrimethylammonium chloride, octyltrimethylammonium bromide, decyltrimethylammonium chloride, decyltrimethylammonium bromide, lauryltrimethylammonium chloride, lauryltrimethylammonium bromide, myristyltrimethylammonium chloride, myristyltrimethylammonium bromide, cetyltrimethylammonium chloride, cetyltrimethylammonium bromide, stearyltrimethylammonium chloride, stearyltrimethylammonium bromide, behenyltrimethylammonium chloride, behenyltrimethylammonium bromide, lauryldimethylbenzylammonium chloride, myristyldimethylbenzylammonium chloride, cetyldimethylbenzylammonium chloride, stearyldimethylbenzylammonium chloride, and one or more combinations selected from dicocoyldimethylammonium chloride such as dilauryldimethylammonium chloride, dimyristyldimethylammonium chloride, dicetyldimethylammonium chloride, and distearyldimethylammonium chloride.

[0018] In addition, preferred cationic surfactants in the present invention are one or a combination of more than one selected from octyltrimethylammonium chloride, decyltrimethylammonium chloride, lauryltrimethylammonium chloride, myristyltrimethylammonium chloride, cetyltrimethylammonium chloride, stearyltrimethylammonium chloride, dilauryldimethylammonium chloride, and dimyristyldimethylammonium chloride, and particularly preferred are lauryltrimethylammonium chloride and myristyltrimethylammonium chloride alone or in combination.

[0019] Further, the cationic surfactant of the present invention may be, for example, The following formula (III): [ka] (In the formula, R 1 , R 2 and R 3may be the same or different, at least one of which represents a linear or branched alkyl or alkenyl group having 8 to 18 carbon atoms, and the others represent an alkyl or benzyl group having 1 to 3 carbon atoms which may be substituted with a hydroxyl group, X - Tertiary ammonium salts represented by the formula (I) are also preferably used.

[0020] Examples of tertiary ammonium salts of formula (III) include octyldimethylammonium chloride, octyldimethylammonium bromide, decyldimethylammonium chloride, decyldimethylammonium bromide, lauryldimethylammonium chloride, lauryldimethylammonium bromide, myristyldimethylammonium chloride, myristyldimethylammonium bromide, cetyldimethylammonium chloride, cetyldimethylammonium bromide, stearyldimethylammonium chloride, stearyldimethylammonium bromide, behenyldimethylammonium chloride, behenyldimethylammonium bromide, laurylmethylbenzylammonium chloride, myristylmethylbenzylammonium chloride, cetylmethylbenzylammonium chloride, stearylmethylbenzylammonium chloride, and dicocoylmethylammonium chlorides such as dilaurylmethylammonium chloride, dimyristylmethylammonium chloride, dicetylmethylammonium chloride, and distearylmethylammonium chloride.

[0021] In addition, examples of the cationic surfactant of the present invention include The following formula (IV): [ka] (In the formula, R 2 , R 3 and R 4 represents an alkyl group having 1 to 3 carbon atoms which may be substituted with a hydroxyl group or a benzyl group, which may be the same or different, R 5 represents an alkyl or alkenyl group having 8 to 18 carbon atoms; R 6 represents an ethylene group or a propylene group, and X -represents an anion) can also be preferably used.

[0022] Examples of the quaternary ammonium salt of formula (IV) include octylethyltrimethylammonium chloride, octylpropyltrimethylammonium chloride, octylethyltrimethylammonium bromide, octylpropyltrimethylammonium bromide, decylethyltrimethylammonium chloride, decylpropyltrimethylammonium chloride, decylethyltrimethylammonium bromide, decylpropyltrimethylammonium bromide, laurylethyltrimethylammonium chloride, laurylpropyltrimethylammonium chloride, laurylethyltrimethylammonium bromide, laurylpropyltrimethylammonium bromide, myristylethyltrimethylammonium chloride, myristylpropyltrimethylammonium chloride, myristylethyltrimethylammonium bromide, myristylpropyltrimethylammonium bromide, cetylethyltrimethylammonium chloride, cetylpropyltrimethylammonium chloride, cetylethyltrimethylammonium bromide, cetylpropyltrimethylammonium bromide, stearylethyltrimethylammonium chloride, stearylpropyltrimethylammonium chloride, stearylethyltrimethylammonium bromide, and stearylpropyltrimethylammonium bromide.

[0023] Further, the cationic surfactant of the present invention may be, for example, The following formula (V): [ka] (In the formula, R 2 and R 3 represents an alkyl group having 1 to 3 carbon atoms which may be substituted with a hydroxyl group or a benzyl group, which may be the same or different, R 5 represents an alkyl or alkenyl group having 8 to 18 carbon atoms; R 6 represents an ethylene group or a propylene group, and X - Tertiary ammonium salts represented by the formula (I) are also preferably used.

[0024] Examples of the tertiary ammonium salt of formula (V) include octylethyldimethylammonium chloride, octylpropyldimethylammonium chloride, octylethyldimethylammonium bromide, octylpropyldimethylammonium bromide, decylethyldimethylammonium chloride, decylpropyldimethylammonium chloride, decylethyldimethylammonium bromide, decylpropyldimethylammonium bromide, laurylethyldimethylammonium chloride, laurylpropyldimethylammonium chloride, laurylethyldimethylammonium bromide, laurylpropyldimethylammonium bromide, myristylethyldimethylammonium chloride, myristylpropyldimethylammonium chloride, myristylethyldimethylammonium bromide, myristylpropyldimethylammonium bromide, cetylethyldimethylammonium chloride, cetylpropyldimethylammonium chloride, cetylethyldimethylammonium bromide, cetylpropyldimethylammonium bromide, stearylethyldimethylammonium chloride, stearylpropyldimethylammonium chloride, stearylethyldimethylammonium bromide, and stearylpropyldimethylammonium bromide.

[0025] The linear or branched alkyl or alkenyl group in the above formulas (I) to (V) preferably has 18 to 18 carbon atoms, and more preferably has 12 to 14 carbon atoms.

[0026] In addition, X in the above formulas (I) to (V) - The anion represented by the formula (I) is not particularly limited as long as it is an anion capable of forming a salt with ammonium, such as a halogen atom, such as chlorine or bromine, or an organic acid, such as an alkylsulfuric acid having 1 to 3 carbon atoms.

[0027] Glyoxylic acid is a carboxylic acid represented by H-CO-COOH. Glyoxylic acid is used in perm agents and hair straighteners (Patent Documents 6 and 7). However, it was not known that glyoxylic acid has the effect of thickening hair diameter or repairing the surface of hair.

[0028] The active ingredient in the composition of the present invention is preferably contained at a concentration sufficient to achieve the effect of thickening hair and / or repairing the surface of hair.

[0029] The concentration of the cationic surfactant in the composition of the present invention is preferably 0.01% by weight to 5% by weight, more preferably 0.05% by weight to 1% by weight, and particularly preferably 0.1% by weight to 0.5% by weight, based on the total amount of the composition of the present invention. The higher the concentration, the higher the effect of increasing the hair diameter, but even at 0.1% by weight, a sufficient effect can be confirmed, and if the amount exceeds 0.5% by weight, no effect commensurate with the amount of the amount added can be expected.

[0030] The concentration of glyoxylic acid in the composition of the present invention is preferably 1 to 25% by weight, more preferably 5 to 20% by weight, and may be particularly preferably 10 to 15% by weight, based on the total amount of the composition of the present invention.

[0031] The pH of the composition of the present invention containing a cationic surfactant as an active ingredient may be preferably pH 2-9, pH 3-9, pH 4-9, pH 5-9, pH 6-9, or pH 7-9. In some cases, pH 2-8, pH 3-8, pH 4-8, pH 5-8, pH 6-8, or pH 7-8 may be preferred. In other cases, pH 2-7, pH 3-7, pH 4-7, pH 5-7, or pH 6-7 may be preferred. In the pH range of 3-7, the higher the pH, the higher the effect of increasing the hair diameter, and at pH 7 or higher, the effect becomes almost constant. However, a significant effect can be confirmed even at pH 3. In addition, if the pH is too high, the alkali becomes too strong, which can cause damage to the scalp and hair.

[0032] The pH of the composition of the present invention containing glyoxylic acid as an active ingredient may be preferably pH 2 to 9, pH 3 to 8, pH 4 to 7, pH 5 to 9, pH 6 to 8, or pH 7. In other cases, pH 2 to 8, pH 3 to 8, pH 2 to 7, pH 3 to 7, pH 2 to 6, pH 3 to 6, pH 2 to 5, pH 3 to 5, pH 2 to 4, or pH 3 to 4.

[0033] The time for which the composition of the present invention is applied to hair may be, for example, 1 minute to 1 week, 1 minute to 120 hours, 3 minutes to 1 week, 3 minutes to 120 hours, 3 minutes to 96 hours, 5 minutes to 1 week, 5 minutes to 120 hours, 5 minutes to 96 hours, 5 minutes to 72 hours, 15 minutes to 24 hours, 15 minutes to 24 hours, 1 hour to 6 hours, 2 hours to 6 hours, etc. The longer the application time, the higher the effect of increasing the hair diameter, but a sufficient effect can be confirmed even with 5 minutes, and the effect becomes almost constant at 6 hours or more.

[0034] The method of application of the composition of the present invention is not particularly limited, but it is preferable to apply the composition in a manner that fully exerts the effect of thickening hair and / or repairing the surface of hair. It is particularly preferable to apply the composition of the present invention directly to hair.

[0035] The form that the composition of the present invention can take is preferably a form that can be applied to hair, such as a rinse, treatment, pack, hair cream, mousse, shampoo, tonic, milky lotion, skin lotion, aerosol, perm agent, hair straightener, etc., but is not limited to these.

[0036] The composition of the present invention containing a cationic surfactant as an active ingredient can be applied, for example, in the form of a rinse or treatment to hair after washing, for example, once a week, once every three days, once every two days, once a day, twice a day, or three times a day in an appropriate amount, for example, 1 to 10 ml, 1 to 5 ml, etc.

[0037] The composition of the present invention containing glyoxylic acid as an active ingredient can be applied to hair, for example, in the form of a treatment, in an appropriate amount, for example, 10 ml to 200 ml, 50 ml to 100 ml, once in June, once in May, once in April, once in March, once in February, once in January, twice in January, three times in January, or four times in January.

[0038] After the hair is soaked in the composition of the present invention containing glyoxylic acid as an active ingredient, the hair is preferably subjected to a heat treatment. The heating temperature is preferably 150°C to 300°C, 160°C to 280°C, 170°C to 250°C, or 180°C to 230°C, and in some cases 180°C to 230°C is more preferable. In other cases 150°C to 230°C is more preferable.

[0039] The heating time may be, for example, 1 second to 10 minutes, 2 seconds to 10 minutes, 3 seconds to 10 minutes, 4 seconds to 10 minutes, 5 seconds to 10 minutes, 10 seconds to 5 minutes, 20 seconds to 3 minutes, 30 seconds to 2 minutes, 1 minute to 2 minutes, 30 seconds to 1 minute, etc.

[0040] However, the concentration of the active ingredient in the composition, the pH of the composition, the immersion time, the form, the application method, the application amount, the heating temperature, and the heating time can be appropriately adjusted according to the target hair type, thickness, amount, number, scalp condition, room temperature, etc., and are not limited to the above embodiments.

[0041] Furthermore, the composition of the present application may contain various oily or aqueous components, moisturizers, thickeners, preservatives, antioxidants, fragrances, colorants, various chemicals, and the like that are generally used in hair treatment compositions, hair cosmetics, quasi-drugs, pharmaceuticals, and the like, as necessary and as long as the effects of the present invention are not impaired.

[0042] Furthermore, the present application also provides a method for thickening hair and / or repairing the surface of hair, comprising applying to the hair a composition of the present invention.

[0043] In the method of the present invention for thickening hair and / or repairing the surface of hair, for example, a composition containing 0.1 to 0.5% by weight of lauryltrimethylammonium chloride and having a pH of 3 to 8 may be applied to the hair for 5 minutes to 1 week to thicken the hair and / or repair the surface of the hair.

[0044] Furthermore, in the method of the present invention for thickening hair and / or repairing the surface of hair, for example, a composition containing 10% by weight to 15% by weight of glyoxylic acid and having a pH of 2 to 7 may be applied to the hair for 5 minutes to 1 week, and then the hair may be heated at 150° C. to 230° C. for 30 seconds to 2 minutes to thicken the hair and / or repair the hair surface. EXAMPLES

[0045] The present invention will now be described in more detail with reference to examples, although the present invention is not limited thereto. Experiment 1: Effects of various surfactants on thickening hair diameter The effect of increasing the bristle diameter was examined using various surfactants shown below.

[0046] [Table 1]

[0047] Hair diameter measurement Hair diameter was measured using a microscope (VHX1000: Keyence Corporation). The hair was attached to a petri dish with tape so that the thickness of the same part at the same angle before and after treatment could be compared, and the thickness of the hair 0.1 mm protruding from the tape was measured before and after treatment and compared.

[0048] Healthy human hair purchased from Beaulax was used, which had been treated four times each with hair coloring and perm agents. For hair coloring agent treatment, agent 1 (PRIMIENCE N6) and agent 2 (PRIMIENCE 6) were mixed in a ratio of agent 1:agent 2 = 1:1 and treated at 31°C for 30 minutes. For perm agent treatment, agent 1 (CRYSTARIZING STRAIGHT H1 Straightner) was used for 15 minutes at 31°C, followed by agent 2 (CRYSTARIZING STRAIGHT 2 Neutralizing Emulsion) for 3 minutes at 31°C.

[0049] Preparation of solutions Solutions containing each of the activators shown in Table 1 were prepared according to the compositions shown in Table 2. A solution prepared in the same manner but without the activator served as a control.

[0050] [Table 2]

[0051] The hair was immersed in the solution prepared as above for 1 hour, rinsed with water, and then dried. After drying, the hair diameter was measured using the method described above. Student's t-test was used to test for statistical significance (*p<0.05, **p<0.01, ***p<0.001).

[0052] The results are shown in Figure 5. Figure 5 shows that the cationic surfactants LTC and STC were more effective at thickening the hair diameter than the control. LTC was particularly effective. On the other hand, anionic surfactants such as LES and AMT, and amphoteric surfactants such as IMB and AMPB did not change the hair diameter much after treatment compared to the control, and either no effect or a very low effect was observed in thickening the hair diameter.

[0053] Experiment 2: Effect of different cationic surfactants on thickening hair diameter Next, the effect of using each cationic surfactant to thicken the hair diameter was investigated. The experiment was carried out with the same composition and method as in Experiment 1, except that the surfactants used were those shown in Table 3 below, and their concentration was 0.5%. Student's t-test was used to test for statistical significance (*p<0.05, **p<0.01, ***p<0.001).

[0054] [Table 3]

[0055] The results are shown in Figure 6. Figure 6 shows that LTC, which has a carbon chain length of 12, had a very high hair diameter increasing effect. However, STC, which has a carbon chain length of 18, and DLTC, which is a two-chain form of LTC, also had a significant hair diameter increasing effect compared to the control.

[0056] Experiment 3: Effect of different carbon chains of cationic surfactants on thickening of hair diameter Next, the effect of thickening the hair diameter was investigated using cationic surfactants with various carbon chain lengths. The cationic surfactants used in the experiment were those shown in Table 4 below, and the composition and method were the same as in Experiment 1, except that the sample was immersed in a solution with a concentration of 10% by weight for 6 hours. Student's t-test was used to test for statistical significance (*p<0.05, **p<0.01, ***p<0.001).

[0057] [Table 4]

[0058] The results are shown in Figure 7. Figure 7 shows that all cationic surfactants used in Experiment 3 significantly increased the hair diameter compared to the control. Cationic surfactants with carbon chains of 12 to 14 were particularly effective in expanding the hair diameter, but cationic surfactants with other carbon lengths also had the effect of increasing the hair diameter.

[0059] Experiment 4: Effect of pH on thickening LTC hair diameter The difference in the hair diameter increasing effect due to pH was investigated using LTC. The experiment was carried out with the same composition and method as in Experiment 1, except that 5 wt% LTC was used as a cationic surfactant and the pH of each composition was adjusted to 2, 3, 4, 5, 6, and 7 using sodium hydroxide.

[0060] The results are shown in Figure 8. Figure 8 shows that, in the range of pH 3 to 7, the higher the pH of the composition, the greater the effect of expanding the hair diameter, but at all pH levels, a greater hair diameter increase effect was obtained compared to the control. When the above experiment was also performed at pH 8 and 9, the same results as at pH 7 were obtained (not shown), indicating that when the pH is 7 or higher, the hair increase effect does not change significantly even if the pH is increased beyond that.

[0061] Experiment 5: Concentration study The difference in the hair diameter increase effect due to the LTC concentration was investigated. The experiment was carried out in the same manner and with the same composition as in Experiment 1, except that LTC was used as a cationic surfactant and the LTC concentration in each composition was adjusted to 0.0 wt%, 0.1 wt%, 0.5 wt%, 1.0 wt%, and 5.0 wt%.

[0062] The results are shown in Figure 9. When the LTC concentration in the composition was 0.1% by weight, the bristle diameter increased by more than 5%. This bristle diameter increase effect became almost constant when the LTC concentration was 0.5% by weight or more.

[0063] Experiment 6: Examination of soaking time The difference in the hair diameter increase effect due to the immersion time in the LTC solution was investigated. The experiment was carried out with the same composition and method as in Experiment 1, except that 0.5 wt% LTC was used as the cationic surfactant and the immersion time of the hair in the solution was 5 minutes, 1 minute, 1 hour, 2 hours, 6 hours, and 24 hours.

[0064] The results are shown in Figure 10. Figure 10 shows that when the immersion time was 5 minutes, the hair diameter increased by about 2 to 3%. This hair diameter increase effect increased with increasing immersion time, but became almost constant after 6 hours or more.

[0065] Experiment 7: Changes in hair diameter due to glyoxylic acid treatment Hair obtained in the same manner as in Experiment 1 was used. A solution having the composition shown in Table 5 below was prepared. The pH of this solution was about 2. A phosphate buffer solution not containing glyoxylic acid was used as a control. The hair was immersed in the thus prepared solution for 1 hour. After immersion, the hair was dried by towel drying and treated with a hair iron at 180°C for 60 seconds. After treatment, the hair was washed with shampoo and dried. The hair diameter after drying was measured by the same method as above. Student's t-test was used to test for statistical significance (*p<0.05, **p<0.01, ***p<0.001).

[0066] [Table 5]

[0067] The results are shown in Figure 11. It can be seen that the hair diameter was significantly increased compared to the control solution of only the buffer solution without glyoxylic acid. Therefore, the hair diameter-increasing effect of glyoxylic acid was confirmed.

[0068] In these examples, hair that had been damaged by treatment with a hair coloring agent and a perm agent was used, but even when the composition of the present invention was applied to healthy hair, the hair diameter increased with a statistically significant difference before and after treatment, confirming a similar effect of increasing hair diameter. [Industrial Applicability]

[0069] The compositions and methods of the present invention can be used to thicken hair and / or repair the surface of hair. By thickening hair, the overall volume of the hair can be increased, and by repairing the surface of hair, the smoothness and shine of hair can be improved and dryness can be reduced.

Claims

1. A composition for thickening hair, comprising glyoxylic acid in an amount of 1 to 25% by weight as an active ingredient for thickening hair.

2. A composition for thickening hair, comprising: The composition contains a cationic surfactant in an amount of 0.1% by weight or more as an active ingredient for thickening hair, The composition, wherein the cationic surfactant is a quaternary ammonium salt selected from the group consisting of octyltrimethylammonium chloride, decyltrimethylammonium chloride, myristyltrimethylammonium chloride, and dilauryldimethylammonium chloride, which is a combination of one or more of these quaternary ammonium salts.

3. A composition for thickening hair, comprising: The composition contains cetyltrimethylammonium chloride or stearyltrimethylammonium chloride in an amount of 1.0% by weight or more as an active ingredient for thickening hair.

4. The composition according to any one of claims 1 to 3, wherein the pH of the composition is in the range of 2 to 9.

5. The composition according to any one of claims 1 to 4, wherein the composition is applied to the hair for between 1 minute and 1 week.

6. The composition according to any one of claims 1 to 5, wherein the hair is heated after the composition has been applied to the hair.

7. The composition according to claim 6, wherein the heating temperature is 150°C or higher.

8. A method for thickening hair, comprising: Said method comprising applying a composition according to any one of claims 1 to 7 to hair.

9. The method of claim 8, further comprising heating the hair after applying the composition to the hair.

10. The method according to claim 9, wherein the heating temperature is 150° C. or higher.

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