JP5060179B2 - Hair elasticity improver - Google Patents

Description

The present invention relates to a hair elasticity improving agent containing a higher fatty acid.

In a hair treatment composition, for example, a hair treatment, shampoo, rinse, or hair dye composition, an oily component such as a higher fatty acid is generally blended to impart a moist feeling to the hair. As for the higher fatty acid, its salt becomes an anionic surfactant. For this reason, higher fatty acids are also used as anionic surfactants, for example as emulsifiers, dispersants and foaming agents. For example, Patent Document 1 discloses a hair treatment composition containing a higher fatty acid salt and a higher fatty acid. Patent Document 1 can improve detergency and foaming power by blending a higher fatty acid salt and a higher fatty acid at a specific ratio.
Japanese Patent Laid-Open No. 10-176194 Japanese Patent Laid-Open No. 10-87448

  However, the higher fatty acid disclosed in Patent Document 1 has a high moisturizing effect, and thus has a problem that the moisture feeling of the hair may be excessive. For this reason, there is a problem that the entire hair becomes heavy and the elasticity of the hair, particularly near the base of the hair, is lowered, making it difficult to make a hairstyle with a volume feeling.

  By the way, Patent Document 2 discloses a hair styling agent containing a synthetic polymer such as polyvinylpyrrolidone as a compound that imparts hair styling properties. However, such a synthetic polymer has a problem that when applied to hair, the flexibility of the hair is lowered and the feel of the hair is inferior. Therefore, even if a synthetic polymer is used, it is difficult to make a hairstyle with a volume feeling while imparting a moist feeling to the hair.

As a result of intensive studies by the present inventors, the present invention solves the above problems by blending L-theanine and a specific organic acid in the hair treatment composition in a hair treatment composition in which higher fatty acids are used. It was made by finding out what is done. An object of the present invention is to provide a hair elasticity improving agent capable of improving the elasticity near the root of the hair while imparting a moist feeling to the hair.

In order to achieve the above object, the hair elasticity improving agent of the invention according to claim 1 is (A) L-theanine, (B) a higher fatty acid having 12 to 18 carbon atoms, and (C) 6 or less carbon atoms. At least one selected from organic acids and salts thereof, and the (B) higher fatty acid having 12 to 18 carbon atoms is lauric acid, myristic acid, palmitic acid, stearic acid, isostearic acid, 12-hydroxystearic acid, At least one selected from oleic acid, linoleic acid, and linolenic acid, and the organic acid having 6 or less carbon atoms is citric acid, acetic acid, glycolic acid, formic acid, levulinic acid, oxalic acid, lactic acid, tartaric acid, succinic acid , Malic acid, L-glutamic acid, L-aspartic acid, pyrrolidonecarboxylic acid, etidronic acid, aminotri (methylenephosphonic acid), and ethylenediamine Characterized by at least one Der Rukoto selected from tetra (methylene phosphonic acid).

The invention described in 請 Motomeko 2, in hair elasticity improving agent according to claim 1, characterized in that it further contains (D) a cationic surfactant.

  ADVANTAGE OF THE INVENTION According to this invention, the elasticity of hair base vicinity can be improved, providing a moist feeling with respect to hair.

  Hereinafter, embodiments in which the present invention is embodied in a composition for treating hair will be described in detail. The hair treatment composition according to this embodiment is at least one selected from (A) L-theanine, (B) a higher fatty acid having 12 to 18 carbon atoms, and (C) an organic acid having 6 or less carbon atoms and salts thereof. For example, (D) a cationic surfactant may be further contained.

  (A) L-theanine is moisturized to hair by the combined use of (B) a higher fatty acid having 12 to 18 carbon atoms, and (C) at least one selected from organic acids having 6 or less carbon atoms and salts thereof. The effect of improving the elasticity near the root of the hair is exhibited. (A) L-theanine alone has a hair repair effect. (A) L-theanine is a derivative of L-glutamic acid and is a kind of amino acid. L-theanine is a component that is abundant in tea leaves, especially gyokuro, and is known as an umami component of green tea. L-theanine can be obtained by extraction from tea leaves by a conventional method or by chemical synthesis. Any natural or synthetic L-theanine can be used in the hair treatment composition.

  The content of (A) L-theanine in the hair treatment composition is preferably 0.001 to 5 mass%, more preferably 0.01 to 3 mass%. (A) If the content of L-theanine is less than 0.001% by mass, the effect of improving the elasticity to the hair cannot be exhibited sufficiently. (A) Even if the content of L-theanine exceeds 5% by mass, no further effect of improving the elasticity to the hair can be obtained.

  (B) Higher fatty acids having 12 to 18 carbon atoms are moisturized to hair by the combined use of (A) L-theanine and (C) at least one selected from organic acids having 6 or less carbon atoms and salts thereof. The effect of improving the elasticity near the root of the hair is exhibited. Examples of (B) higher fatty acids include lauric acid, myristic acid, palmitic acid, stearic acid, isostearic acid, 12-hydroxystearic acid, oleic acid, linoleic acid, and linolenic acid. Specific examples of these higher fatty acids may be used alone or in combination of two or more.

  The content of (B) a higher fatty acid having 12 to 18 carbon atoms in the hair treatment composition is preferably 0.05 to 30% by mass, more preferably 0.1 to 20% by mass. (B) If the content of the higher fatty acid having 12 to 18 carbon atoms is less than 0.05% by mass, the effect of improving the moisture retention cannot be sufficiently exerted on the hair. (B) Even if the content of the higher fatty acid having 12 to 18 carbon atoms exceeds 30% by mass, the effect of improving the moisturizing property for the hair is not obtained, and there is a risk of causing the hair to feel sticky. is there.

  (C) At least one selected from organic acids having 6 or less carbon atoms and salts thereof has a moist feeling on hair by the combined use of (A) L-theanine and (B) higher fatty acids having 12 to 18 carbon atoms. While imparting, it exhibits the effect of improving the elasticity near the base of the hair. An organic acid refers to an organic compound having an acidic functional group and exhibiting acidity. Examples of the organic acid include carboxylic acids and phosphonic acids. Examples of carboxylic acids having 6 or less carbon atoms include citric acid, acetic acid, glycolic acid, formic acid, levulinic acid, oxalic acid, lactic acid, tartaric acid, succinic acid, malic acid, L-glutamic acid, L-aspartic acid, and pyrrolidonecarboxylic acid. Is mentioned. Examples of the phosphonic acids having 6 or less carbon atoms include etidronic acid (also called hydroxyethanediphosphonic acid), aminotri (methylenephosphonic acid), and ethylenediaminetetra (methylenephosphonic acid). Specific examples of these organic acids may be used alone or in combination of two or more. Moreover, salts of those organic acids may be used.

  The content of at least one selected from (C) an organic acid having 6 or less carbon atoms and salts thereof in the hair treatment composition is preferably 0.001 to 5 mass%, more preferably 0.002 to 2 mass%. It is. (C) When the content of at least one selected from organic acids having 6 or less carbon atoms and salts thereof is less than 0.001% by mass, the effect of improving the elasticity to hair cannot be sufficiently exhibited. (C) Even if the content of at least one selected from organic acids having 6 or less carbon atoms and salts thereof exceeds 5% by mass, no further effect of improving the elasticity to the hair is obtained. There is a risk of damage.

  (D) The cationic surfactant is suitably blended in order to exhibit the effect of further improving the elasticity near the root of the hair. Examples of (D) cationic surfactants include alkyltrimethylammonium salts, alkenyltrimethylammonium salts, dialkyldimethylammonium salts, dialkenyldimethylammonium salts, lanolin fatty acid aminopropylethyldimethylammonium, and alkyloylamidopropyldimethylamine. It is done. Examples of the alkyl trimethyl ammonium salt include stearyl trimethyl ammonium chloride. Examples of the dialkyldimethylammonium salt include distearyldimethylammonium chloride. Examples of the counter ion of the cationic group of these surfactants include chloride ion, bromide ion, iodide ion, alkyl sulfate ion, and saccharin. Specific examples of these (D) cationic surfactants may be used alone or in combination of two or more.

  The content of the (D) cationic surfactant in the hair treatment composition is preferably 0.01 to 10% by mass, more preferably 0.05 to 5% by mass. (D) If the content of the cationic surfactant is less than 0.01% by mass, the effect of improving the elasticity to the hair cannot be sufficiently exhibited. (D) Even if the content of the cationic surfactant exceeds 10% by mass, no further effect of improving the elasticity to the hair can be obtained, and there is a risk that the hair will become sticky.

  If necessary, the hair treatment composition may be, for example, water, a water-soluble polymer compound, an oil component other than the above, a polyhydric alcohol, a surfactant other than the above, a saccharide, a preservative, a chelating agent, a stabilizer, pH You may contain at least 1 type chosen from a regulator, a plant extract, a herbal extract, vitamins, a fragrance | flavor, and a ultraviolet absorber.

  Water is used as a solvent or dispersion medium for each component. An appropriate amount of water is mixed with the surfactant to emulsify the hair treatment composition. The water content in the hair treatment composition is preferably 50 to 95% by mass, more preferably 70 to 90% by mass. If the water content is less than 50% by mass, emulsification of the hair treatment composition may be insufficient. If the water content exceeds 95% by mass, it becomes difficult to ensure the uniformity and stability of the hair treatment composition.

  Examples of the water-soluble polymer compound include gum arabic, gum karaya, gum tragacanth, sodium alginate, xanthan gum, cellulose derivatives, cross-linked polyacrylic acid, and polydimethylmethylene piperidinium chloride. Examples of the crosslinked polyacrylic acid include carbomers.

  The oily component imparts a moist feeling to the hair. Therefore, the hair treatment composition preferably contains an oily component. Examples of the oil component include fats and oils, waxes, higher alcohols, hydrocarbons, higher fatty acids other than the above, alkyl glyceryl ethers, esters, and silicones.

  Examples of oils and fats include olive oil, camellia oil, shea fat, almond oil, safflower oil, sunflower oil, soybean oil, cottonseed oil, sesame oil, corn oil, rapeseed oil, rice bran oil, rice germ oil, grape seed oil, avocado oil , Macadamia nut oil, castor oil, coconut oil, and evening primrose oil. Examples of the waxes include beeswax, candelilla wax, carnauba wax, jojoba oil, and lanolin.

  Examples of higher alcohols include lauryl alcohol, myristyl alcohol, cetanol, stearyl alcohol, cetostearyl alcohol, aralkyl alcohol, behenyl alcohol, 2-hexyldecanol, isostearyl alcohol, 2-octyldodecanol, decyltetradecanol, oleyl alcohol, and Lanolin alcohol is mentioned.

  Examples of the hydrocarbon include paraffin, olefin oligomer, polyisobutene, hydrogenated polyisobutene, mineral oil, squalane, polybutene, polyethylene, microcrystalline wax, and petrolatum. Examples of the higher fatty acid include behenic acid and lanolin fatty acid. Examples of the alkyl glyceryl ether include batyl alcohol, chimyl alcohol, ceralkyl alcohol, and isostearyl glyceryl ether.

  Examples of esters include diisopropyl adipate, isopropyl myristate, cetyl octanoate, isononyl isononanoate, octyldodecyl myristate, isopropyl stearate, stearyl stearate, myristyl myristate, isotridecyl myristate, 2-ethylhexyl palmitate Octyldodecyl ricinoleate, fatty acid (C10-30) (cholesteryl / lanosteryl), cetyl lactate, lanolin acetate, ethylene glycol di-2-ethylhexanoate, pentaerythritol fatty acid ester, dipentaerythritol fatty acid ester, cetyl caprate, tricapryl Examples include glyceryl acid, diisostearyl malate, and dioctyl succinate.

  Examples of silicones include dimethylpolysiloxane (dimethicone), methylphenylpolysiloxane, decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane, terminal hydroxyl group-modified dimethylpolysiloxane, polyether-modified silicone, and an average polymerization degree of 650 to 10,000. Examples include highly polymerized silicone, amino-modified silicone, betaine-modified silicone, alkyl-modified silicone, alkoxy-modified silicone, mercapto-modified silicone, carboxy-modified silicone, and fluorine-modified silicone. Examples of the polyether-modified silicone include PEG-12 dimethicone. Specific examples of these oil components may be used alone or in combination of two or more.

  Examples of the polyhydric alcohol include glycerin, diglycerin, polyglycerin, ethylene glycol, isopentyldiol, propylene glycol (PG), dipropylene glycol (DPG), and 1,3-butylene glycol (BG).

  The surfactant is suitably blended to maintain the stability of the hair treatment composition as an emulsifier of the composition or a solubilizer of each component in the composition. Surfactants include ionic surfactants and nonionic surfactants. Examples of the ionic surfactant include anionic surfactants and amphoteric surfactants. Examples of the anionic surfactant include alkyl ether sulfate, alkyl sulfate, alkenyl ether sulfate, alkenyl sulfate, olefin sulfonate, alkane sulfonate, saturated or unsaturated fatty acid salt, alkyl or alkenyl ether carboxylate , Α-sulfone fatty acid salts, N-acylamino acid type surfactants, phosphate mono- or diester type surfactants, and sulfosuccinic acid esters. Examples of the alkyl ether sulfate include sodium laureth sulfate. Examples of the N-acylamino acid type surfactant include sodium N-lauroyl-L-glutamate. Examples of the counter ion of the anionic group of these surfactants include sodium ion, potassium ion, and triethanolamine.

  Examples of amphoteric surfactants include cocobetaine, lauramidopropyl betaine, cocamidopropyl betaine, sodium lauroamphoacetate, and sodium cocoamphoacetate.

  Examples of the nonionic surfactant include polyoxyalkylene alkyl ether, polyoxyalkylene alkenyl ether, polyoxyethylene sorbitan fatty acid ester, sucrose fatty acid ester, sorbitan fatty acid ester, alkyl saccharide surfactant, glycerin fatty acid ester, Examples include polyoxyethylene hydrogenated castor oil, fatty acid alkanolamide, and alkylamine oxide. Examples of the polyoxyalkylene alkyl ether include laureth, ceteth, steareth, and palace. Specific examples of these surfactants may be used alone or in combination of two or more.

  Examples of the saccharide include sorbitol and maltose. Examples of the preservative include parabens. Examples of the chelating agent include ethylenediaminetetraacetic acid disodium (EDTA-2Na). Examples of the stabilizer include phenacetin, 8-hydroxyquinoline, acetanilide, sodium pyrophosphate, barbituric acid, uric acid, and tannic acid. Examples of the pH adjuster include 2-amino-2-methyl-1-propanol (AMP), triethanolamine (TEA), and arginine.

  The hair treatment composition can be made into a liquid, mist, gel, foam, cream, or other dosage form. The hair treatment composition can be used as a hair care agent for imparting a moisturizing effect, for example, a shampoo, a rinse, and a hair treatment agent. The composition for treating hair may be used after being applied to the hair and washed away with water or warm water, or the composition adhering to the hair may be used without being washed away with water or warm water. More preferably, it is used as a rinse or hair treatment agent in a form used after shampooing. The composition for treating hair may be used after being applied to the hair and washed away with water or warm water, or the composition adhering to the hair may be used without being washed away with water or warm water. This hair treatment composition may be used as a hair styling agent. The composition for treating hair may be used after being applied to the hair and washed away with water or warm water, or the composition adhering to the hair may be used without being washed away with water or warm water. The hair treatment composition may be used as a hair dyeing agent, for example, an oxidative hair dye and an acid hair dye, for example, by further blending a dye. This hair treatment composition may be applied as a bleaching agent, for example, by blending an oxidizing agent. This hair treatment composition may be used, for example, as a permanent wave agent, a hair straightener and a decoloring agent by blending a reducing agent.

According to the embodiment described in detail above, the following effects are exhibited.
(1) In this embodiment, the hair treatment composition is selected from (A) L-theanine, (B) a higher fatty acid having 12 to 18 carbon atoms, and (C) an organic acid having 6 or less carbon atoms and salts thereof. At least one kind was blended. Therefore, it is possible to improve elasticity near the base of the hair while giving a moist feeling to the hair.

  (2) In this embodiment, the hair treatment composition is selected from (A) L-theanine, (B) a higher fatty acid having 12 to 18 carbon atoms, and (C) an organic acid having 6 or less carbon atoms and salts thereof. At least one kind was blended. Therefore, it is possible to make a hair style with a sense of volume even for hair that has been damaged by repeated treatment with a chemical treatment agent, for example, a hair dye treatment agent, and whose hair has inherently reduced hair and stiffness. .

  (3) In this embodiment, the hair treatment composition is selected from (A) L-theanine, (B) a higher fatty acid having 12 to 18 carbon atoms, and (C) an organic acid having 6 or less carbon atoms and salts thereof. At least one kind was blended. Therefore, the sustainability of the moist feeling imparted to the hair can also be improved.

  (4) In this embodiment, (B) a hair treatment composition containing a higher fatty acid having 12 to 18 carbon atoms, (A) L-theanine, and (C) an organic acid having 6 or less carbon atoms and salts thereof At least one selected from Therefore, the sticky feeling at the time of use derived from a higher fatty acid can be suppressed.

(5) In this embodiment, (D) cationic surfactant was mix | blended with the composition for hair treatment. Therefore, the volume feeling can be further improved with respect to the hair.
(6) In this embodiment, (A) L-theanine is mix | blended in the composition for hair treatment. Therefore, the composition for hair treatment exhibits a damage repair effect on hair damaged by, for example, hair dyeing treatment, decoloring treatment, permanent treatment and ultraviolet irradiation. Moreover, the persistence of the repair effect is also favorable.

The above embodiment can be modified as follows.
-In the said embodiment, you may divide | segment each component mix | blended with the composition for hair treatment, and you may comprise as a multiple dosage form.

Next, the embodiment will be described more specifically with reference to examples and comparative examples.
(Hair treatment agent)
In each example shown in Tables 1 and 2, a hair treatment composition as a hair treatment agent was prepared by mixing each component. Each composition was applied to a human black hair bundle or a straight bob-style wig (wig: see FIG. 1) and blended into the hair. Next, the hair was left for 3 minutes, rinsed with warm water, and dried with a dryer. In Tables 1 and 2, the unit of the numerical value indicating the blending amount of each component is mass%.

(Hair volume (quantity))
The volume feeling of the hair was judged by visually observing the wig treated with the hair treatment composition of each example. When evaluating the volume of hair, if there is sufficient volume around the base of the hair, the volume is sufficiently “excellent”, and there is elasticity near the root of the hair and there is a sense of volume. `` Good '', the elasticity near the hair root is slightly lost and the volume feeling is slightly inferior, `` Slightly bad '', and the elasticity near the hair root is lost and there is no volume feeling `` "Bad".

  In addition, in FIG. 1, evaluation of the volume feeling of hair is shown for reference. In the hair (wig) of FIG. 1, it was evaluated that the hair on the left side from the top of the head had sufficient elasticity (“excellent”) due to sufficient elasticity near the base of the hair. The hair on the right side from the top of the head was evaluated as having no elasticity (“bad”) due to loss of elasticity near the root of the hair.

(A feeling of stickiness during use)
Five panelists evaluated the stickiness when applying the hair treatment composition of each example to the hair by a sensory test. Take the appropriate amount of each composition in the palm of your hand and apply it to the hair, 4 points if no sticky feeling is left, 3 points if little sticky feeling is left, 2 points if slightly sticky feeling remains In addition, scoring was performed in four stages, with 1 point being the case where the sticky feeling remained and was uncomfortable. For the evaluation of stickiness, an average score is calculated for the scoring results of five panelists, and when the average score is 3.6 points or more, it is regarded as “excellent” and when 2.6 points or more and less than 3.6 points Was “good”, the case of 1.6 points or more and less than 2.6 points was “slightly bad”, and the case of less than 1.6 points was “bad”.

(Tensile strength of hair)
For the human black hair bundle before and after being treated with the hair treatment composition of each example, the breaking stress value was measured using a tensile tester (Tensilon (trade name) UTM-II, manufactured by Toyo Baldwin), and the value increased The rate was the strength increase rate (%).

  And it evaluated on the following reference | standard about the intensity | strength of hair from the calculated | required strength increase rate. A strength increase rate of 9% or more is considered “excellent”, a strength increase rate of 7% or more and less than 9% is “good”, and a strength increase rate of 5% or more and less than 7% is “slightly bad”. Less than 5% was regarded as “bad”.

(Moist hair feeling)
Regarding the human black hair bundle treated with the hair treatment composition of each example, 4 points when the moisture feeling is very good when touched by 5 panelists, 3 points when it is good, 2 points when it is slightly bad , And a bad case was scored in 4 stages. Then, as an evaluation of moist feeling, an average score is calculated for the scoring results of five panelists, and when the average score is 3.6 points or more, it is considered “excellent” and 2.6 points or more and less than 3.6 points The case was “good”, the case of 1.6 points or more and less than 2.6 points was “slightly bad”, and the case of less than 1.6 points was “bad”.

As shown in Table 1, in Examples 1 to 12 containing (A) L-theanine, (B) a higher fatty acid having 12 to 18 carbon atoms, and (C) an organic acid having 6 or less carbon atoms and salts thereof. It was confirmed that all evaluations were “excellent” or “good” with respect to the sense of volume, tensile strength, moisture, and stickiness during use. In particular, in Examples 1 to 8 in which (D) a cationic surfactant is blended, all evaluations of hair volume feeling, tensile strength, moisture feeling, and stickiness feeling during use are “excellent”. confirmed.

  On the other hand, (A) Comparative Example 1 containing no L-theanine resulted in a decrease in volume feeling as shown in Table 2. (A) In Comparative Example 2 in which glutamine as an amino acid was blended in place of L-theanine, it was confirmed that the sense of volume of hair was not improved. In Comparative Examples 1 and 2, it was confirmed that the stickiness during use was not improved.

  It was confirmed that Comparative Example 3 containing (A) L-theanine and (C) an organic acid having 6 or less carbon atoms and salts thereof did not improve both volume and moisture. In Comparative Example 4 in which (A) L-theanine, (C) an organic acid having 6 or less carbon atoms and salts thereof, and higher fatty acid esters are blended, it is confirmed that neither volume feeling nor sticky feeling during use is improved. It was. In Comparative Example 5 in which (A) L-theanine, (C) an organic acid having 6 or less carbon atoms and salts thereof, and a higher fatty acid having 22 carbon atoms are mixed, neither volume feeling nor sticky feeling during use is improved. Was confirmed.

  In addition, the notation of (A)-(D) in a table | surface shows the compound corresponding to each component of this-application claim (following, the same). On the other hand, the notations a to d in the table indicate the comparative compounds of the respective components described in the claims of the present application.

(shampoo)
In each example shown in Table 3, a composition for treating hair as a shampoo was prepared by mixing each component. Each composition was applied to a human black hair bundle or a straight bob-style wig (wig: see FIG. 1), washed, and rinsed with warm water. Next, the hair was dried with a drier, and the dried hair was evaluated for volume feeling, tensile strength, and moisture feeling. Evaluation of volume feeling, tensile strength, moisture feeling, and stickiness when used was in accordance with the method described in the hair treatment agent column. In Table 3, the unit of the numerical value indicating the blending amount of each component is mass%.

As shown in Table 3, in Examples 13 to 15 containing (A) L-theanine, (B) a higher fatty acid having 12 to 18 carbon atoms, and (C) a salt of an organic acid having 6 or less carbon atoms, It was confirmed that all evaluations of hair volume, tensile strength, moisture, and stickiness during use were “excellent” or “good”.

(Out bath treatment agent)
In each example shown in Table 4, a composition for treating hair as an out bath treatment agent was prepared by mixing each component. An appropriate amount of each composition was applied to a bundle of human black hair or a straight bob-style wig after washing with water (wig: see FIG. 1). Next, the hair was dried using a dryer. About the hair after drying, the volume feeling of the hair, the tensile strength, and the moisture feeling were evaluated. Evaluation of volume feeling, tensile strength, moisture feeling, and stickiness when used was in accordance with the method described in the hair treatment agent column. In Table 4, the unit of the numerical value indicating the blending amount of each component is mass%.

As shown in Table 4, it contains (A) L-theanine, (B) a higher fatty acid having 12 to 18 carbon atoms, (C) an organic acid having 6 or less carbon atoms, and (D) a cationic surfactant. In Examples 16 to 19, it was confirmed that all evaluations of hair volume feeling, tensile strength, moisture feeling, and stickiness feeling during use were “excellent”.

Next, the technical idea that can be grasped from the embodiment will be described below.
(A) The hair elasticity improving agent used as a rinse and hair treatment agent used after shampooing.

(B) Content of said (A) L-theanine is 0.001-5 mass%, The said hair elasticity improving agent characterized by the above-mentioned.

The reference figure which shows evaluation of the volume feeling of hair. The hair on the left side from the top of the head shows a case where the volume feeling is sufficient (“excellent”) due to sufficient elasticity near the root of the hair. The hair on the right side from the top of the head shows the case where the elasticity near the base of the hair is lost and there is no volume (“bad”).

Claims (2)

(A) L-theanine, (B) a higher fatty acid having 12 to 18 carbon atoms, and (C) at least one selected from organic acids having 6 or less carbon atoms and salts thereof ,
The (B) higher fatty acid having 12 to 18 carbon atoms is at least one selected from lauric acid, myristic acid, palmitic acid, stearic acid, isostearic acid, 12-hydroxystearic acid, oleic acid, linoleic acid, and linolenic acid. There,
The organic acid having 6 or less carbon atoms is citric acid, acetic acid, glycolic acid, formic acid, levulinic acid, oxalic acid, lactic acid, tartaric acid, succinic acid, malic acid, L-glutamic acid, L-aspartic acid, pyrrolidonecarboxylic acid, etidone. acid, hair elasticity improving agent characterized at least one der Rukoto selected from amino tri (methylene phosphonic acid), and ethylene diamine tetra (methylene phosphonic acid). Furthermore, (D) cationic surfactant is contained, The hair elasticity improving agent of Claim 1 characterized by the above-mentioned.