JP5060178B2 - Hair elasticity improver - Google Patents

Description

The present invention relates to a hair elasticity improving agent containing a modified polypeptide.

  In a hair treatment composition such as a hair treatment, shampoo, rinse or hair dye composition, a hydrolyzed polypeptide is generally known as a component for imparting moisture retention to hair. As hydrolyzed polypeptides applied to hair, for example, hydrolyzed keratin, hydrolyzed collagen, hydrolyzed silk and hydrolyzed soy protein are known. Since these hydrolyzed polypeptides have high affinity with hair composed of keratin proteins, they form a moisturizing protective film on the hair surface.

For example, Patent Documents 1 and 2 disclose modified polypeptides obtained by imparting other characteristics to hydrolyzed polypeptides. Patent Document 1 discloses a modified polypeptide in which a hydrolytic keratin obtained by hydrolyzing keratin and a higher fatty acid are condensed to impart surface activity to the hydrolyzed keratin. Reference 2 discloses a silylated peptide in which a functional group containing a silicon atom is covalently bonded to an amino group of a hydrolyzed polypeptide. The silylated peptide has both characteristics of a silicone oil having an effect of imparting gloss and gloss to hair, for example, and a property of a hydrolyzed polypeptide having an effect of imparting a moist feeling to hair.
JP 59-101449 A JP-A-8-59424 Japanese Patent Laid-Open No. 10-87448

  However, the hydrolyzed polypeptides disclosed in Patent Documents 1 and 2 have a problem that the moisture feeling of the hair may become excessive because of having a high moisturizing effect. 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 3 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 shows that in the hair treatment composition in which the modified polypeptide is used, the above problem can be solved by adding L-theanine to the hair treatment composition. It was made by finding. 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 described in claim 1 contains (A) L-theanine and (B) a modified polypeptide, and (B) the modified polypeptide contains silyl At least one selected from a saponified polypeptide, a cationized polypeptide, and an acylated polypeptide, wherein the silylated polypeptide comprises at least one protein selected from keratin, soybean, wheat, sesame, silk, and collagen. A silylated hydrolyzed protein, wherein the cationized polypeptide is a cationized hydrolyzed protein of at least one protein selected from keratin, soybean, wheat, silk, collagen, and conchiolin, wherein the acylated polypeptide Is an protein of at least one protein selected from soybean and collagen. Characterized Le of hydrolyzed protein der Rukoto.

The invention of claim 2 is the hair elasticity improving agent of claim 1 , wherein the blending ratio of the (A) L-theanine and the (B) modified polypeptide is 1: 0.1 to 1000 as a mass ratio. It is characterized by being.

  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 contains (A) L-theanine and (B) a modified polypeptide.

  (A) L-theanine exhibits the effect of improving the elasticity near the base of the hair while giving a moist feeling to the hair in combination with (B) the modified polypeptide. (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) The modified polypeptide is blended to impart moisture retention to the hair. (B) Since the modified polypeptide has high affinity with hair, it forms a moisturizing protective film on the surface of the hair. (B) As a modified polypeptide, the derivative | guide_body of the hydrolysis polypeptide obtained by processing a hydrolysis polypeptide using a well-known modification method can be mentioned, for example. Hydrolyzed polypeptides are proteins such as soy protein, almond protein, Brazil nut protein, hazelnut protein, barley protein, oat protein, wheat protein, sesame protein, rice (rice bran) protein, corn protein, potato protein, eggshell membrane, egg white It is obtained by hydrolyzing keratin, collagen, silk, pearl oyster glycoprotein, conchiolin, and milk protein. Examples of the hydrolysis treatment include acid treatment, alkali treatment, and protease treatment. The molecular weight of the hydrolyzed polypeptide is not particularly limited, but a hydrolyzed polypeptide that is degraded in the range of several hundred to several thousand is preferable. The smaller the molecular weight of the hydrolyzed polypeptide, the higher the adsorptivity to the hair.

Examples of hydrolyzed polypeptide derivatives include cationized derivatives (cationized polypeptides), silylated derivatives (silylated polypeptides), and acylated derivatives (acylated polypeptides). Examples of the compound used for cationization of the hydrolyzed polypeptide include trimethylammonium salt and alkyl quaternary ammonium salt. The cationized derivative can improve the adsorptivity of the hydrolyzed polypeptide to the hair. Silylated derivatives exhibit e.g. active hydrogen in hydrolysis polypeptide, for example, a hydroxyl group, an amino group, and trisubstituted silyl group -SiR 3 hydrogens attached to the carbon atom in the carboxyl group _(R is for example, a hydroxyl group, a methyl group ). Silylated derivatives of hydrolyzed polypeptides alleviate the effects of silicone oil on hydrolyzed polypeptides, such as the effect of imparting gloss and gloss to hair, the effect of imparting viscosity to hair treatment compositions, and the irritation to the scalp The effect to do can be added. An acylated derivative of a hydrolyzed polypeptide is obtained by subjecting the hydrolyzed polypeptide and a higher fatty acid to a condensation reaction. An acylated derivative of a hydrolyzed polypeptide can impart surface activity to the hydrolyzed polypeptide.

  (B) Examples of modified polypeptides include hydroxypropyltrimonium hydrolyzed keratin, (dihydroxymethylsilylpropoxy) hydroxypropyl hydrolyzed keratin, cationized hydrolyzed soy protein, (dihydroxymethylsilylpropoxy) hydroxypropyl hydrolyzed soy protein, hydroxy Propyltrimonium hydrolyzed wheat protein, (dihydroxymethylsilylpropoxy) hydroxypropyl hydrolyzed wheat protein, hydrolyzed sesame protein PGpropylmethylsilanediol, hydroxypropyltrimonium hydrolyzed silk, (dihydroxymethylsilylpropoxy) hydroxypropyl hydrolyzed silk Hydroxypropyltrimonium hydrolyzed collagen, (dihydroxymethylsilylpropoxy) Mud propyl hydrolyzed collagen, cationized hydrolyzed conchiolin -2, cocoyl hydrolyzed soy protein potassium, and include Isostearoyl hydrolyzed collagen. Specific examples of these (B) modified polypeptides may be used alone or in combination of two or more.

  The content of the modified polypeptide (B) in the hair treatment composition is preferably 0.001 to 10% by mass, more preferably 0.01 to 5% by mass. (B) If the content of the modified polypeptide is less than 0.001% by mass, the effect of improving the moisture retention cannot be sufficiently exerted on the hair. (B) Even if the content of the denatured polypeptide exceeds 10% by mass, no further effect of improving the moisturizing property for the hair can be obtained, and there is a possibility of causing a sticky feeling to the hair.

  (A) In order to further demonstrate the effect of imparting moisture to hair and the effect of improving the elasticity in the vicinity of the hair root by the combined use of L-theanine and (B) the modified polypeptide, (A) L-theanine and (B) The blending ratio of the modified polypeptide is preferably adjusted as follows. (A) L-theanine: (B) modified polypeptide is preferably 1: 0.1 to 1000, more preferably 1: 0.5 to 100, as a mass ratio.

  The hair treatment composition may be, for example, water, a water-soluble polymer compound, an oil component, a polyhydric alcohol, a surfactant, a saccharide, a preservative, a chelating agent, a stabilizer, a pH adjuster, a plant extract. , Herbal extracts, vitamins, fragrances, and ultraviolet absorbers may be included.

  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, 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 lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, isostearic acid, 12-hydroxystearic acid, oleic 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 a cationic surfactant, an anionic surfactant, and an amphoteric surfactant. 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 sulfosuccinate 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 the cationic surfactant include alkyltrimethylammonium salt, alkenyltrimethylammonium salt, dialkyldimethylammonium salt, dialkenyldimethylammonium salt, lanolin fatty acid aminopropylethyldimethylammonium, and alkyloylamidopropyldimethylamine. 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.

  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 lactic acid, glycolic acid, tartaric acid, malic acid, pyrrolidone carboxylic acid (PCA), succinic acid, citric acid, glutamic acid, 2-amino-2-methyl-1-propanol (AMP), and 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. 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, (A) L-theanine was blended with a hair treatment composition containing (B) a modified polypeptide. 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, even when (B) the modified polypeptide is blended in the hair treatment composition, a hairstyle with a volume feeling can be made. In particular, it is possible to make a voluminous hairstyle even for fine hair, which is difficult to make a voluminous hairstyle due to its high moisturizing effect.

  (3) In the present embodiment, (B) a modified polypeptide having a hair moisturizing effect and (A) L-theanine are used in combination. Therefore, the hair moisturizing effect exhibited by (B) the modified polypeptide can be further improved. Moreover, the sustainability of the moisturizing effect is also good.

(4) In the present embodiment, when a hydrolyzed polypeptide is used as the (B) modified polypeptide, the adsorptivity of the polypeptide to hair can be improved.
(5) In this embodiment, as the modified polypeptide (B), a derivative obtained by binding an adduct to a hydrolyzed polypeptide, for example, a cationized derivative, a silylated derivative, or an acylated derivative was used. Therefore, (B) the modified polypeptide can be imparted not only with the moisture retaining property for hair provided by the hydrolyzed polypeptide, but also the effect provided by each adduct.

  (6) In this embodiment, (A) L-theanine is mix | blended in the composition for hair treatment. Therefore, the composition exhibits an effect of repairing damage to 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.

  (7) In this embodiment, when (A) L-theanine and (B) modified polypeptide are used in combination, the hair repair effect exhibited by (A) L-theanine can be further improved.

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 Table 1, 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.

(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”.

(Moisture retention of hair)
The human black hair bundle treated with the hair treatment composition of each example was first left in an atmosphere of 25 ° C. and 50% RH for 24 hours, and the initial hair mass (X) was measured. Next, the same hair bundle was further allowed to stand in an atmosphere of 25 ° C. and 10% RH for 24 hours, and the secondary hair mass (Y) was measured. Next, the same hair bundle with diphosphorus pentoxide was left in a desiccator under reduced pressure for one week, and the dry hair mass (Z) when completely dried was measured. The dry hair mass (Z) was subtracted from the initial hair mass (X) and the secondary hair mass (Y), respectively, to obtain hair moisture in each drying step. Hair treated with only water (control hair) was also subjected to the same drying treatment, and the moisture content of the control hair in each drying step was obtained. When the moisture content in each drying step in each example is 100%, the ratio ([hair moisture content in each example] × 100 / [control hair moisture content]) Expressed as (%). For each example, the average of the ratio (%) to the control hair in each step was calculated. In the evaluation of moisture retention, the case of 110% or more is “excellent”, the case of 105% or more and less than 110% is “good”, the case of 101% or more and less than 105% is “slightly bad”, and less than 101% The case of was considered "bad".

As shown in Table 1, in Examples 1 to 14 containing (A) L-theanine and (B) denatured polypeptide, any evaluation of hair volume, tensile strength, moisture, and moisture retention Was also confirmed to be “excellent” or “good”. In particular, in Examples 1 to 12, in which the modified polypeptide (B) is a cationized derivative and a silylated derivative, all evaluations of hair volume feeling, tensile strength, moisture feeling, and moisture retention are “excellent”. It was confirmed that there was.

  On the other hand, (A) Comparative Example 1 containing no L-theanine resulted in a decrease in volume feeling as shown in Table 2. In Comparative Example 1, compared to Example 1, moisture feeling and moisture retention are reduced. This is considered to be due to the fact that the moisture retention effect of the hair by (B) the modified polypeptide is improved by using (A) L-theanine and (B) the modified polypeptide in Example 1. .

  (B) In Comparative Example 2 in which the modified polypeptide and glutamine as an amino acid are used in combination, it was confirmed that the volume of hair was not improved. In addition, in Comparative Example 2 in which (B) the modified polypeptide and glutamine are used in combination, it was confirmed that the moisture feeling and water retention were reduced as compared with Comparative Example 1 in which no amino acids were blended.

(A) In Comparative Examples 4 to 8 in which L-theanine and hydrolyzed protein are used in combination, it was confirmed that the volume feeling was “bad”. In Comparative Example 3 in which no polypeptide is used, the tensile strength is reduced as compared with each Example. Therefore, by using (A) L-theanine and (B) a modified polypeptide in combination, (A) It can be seen that the effect of repairing hair by L-theanine is further improved.

In addition, the notation of (A) and (B) in a table | surface shows the compound corresponding to each component of this-application claim (hereinafter, the same). On the other hand, the notation of a and b in the table indicates a comparative compound of each component described in the claims.

(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 hair volume, tensile strength, moisture and moisture retention. Each evaluation followed 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 15 to 18 containing (A) L-theanine and (B) modified polypeptide, any evaluation of hair volume feeling, tensile strength, moisture feeling, and moisture retention Was also confirmed to be “excellent”.

(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, the moisture feeling, and the moisture retention were evaluated. Each evaluation followed 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, in Examples 19 to 23 containing (A) L-theanine and (B) modified polypeptide, any evaluation of hair volume feeling, tensile strength, moisture feeling, and moisture retention Was also confirmed to be “excellent”.

(Oxidative hair dye)
The composition for hair treatment as an oxidative hair dye comprises an oxidative hair dye first agent (hereinafter referred to as “first agent”) containing an oxidative dye and an alkaline agent and an oxidative hair dye containing an oxidant. It is composed of two agents (hereinafter referred to as “second agent”). The first agent and the second agent of each example shown in Table 5 were prepared, and the first agent and the second agent were mixed at a mass ratio of 1: 2, and the mixture was mixed with a human black hair bundle or a straight bob style wig. (Wig: see FIG. 1) and then left for 20 minutes. Thereafter, each hair was dyed by washing the mixture adhering to the hair with water and drying it. Each hair thus treated with an oxidative hair dye was used to evaluate the hair's volume, tensile strength, moisture and moisture retention. Each evaluation followed the method described in the hair treatment agent column. In Table 5, the unit of the numerical value indicating the blending amount of each component is mass%.

As shown in Table 5, in Examples 24 to 27 containing (A) L-theanine and (B) modified polypeptide, any evaluation of hair volume, tensile strength, moisture, and moisture retention Was also confirmed to be “excellent”.

Next, the technical idea that can be grasped from the embodiment will be described below.
(A) The hair elasticity improving agent, wherein the modified polypeptide (B) is a derivative of a hydrolyzed polypeptide obtained by modifying the hydrolyzed polypeptide.

(B) the hydrolysis polypeptide, soy protein, sesame protein, wheat protein, keratin, collagen, and the hair elasticity improving agent characterized by being obtained by hydrolysis of silk.

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) containing L-theanine and (B) a modified polypeptide ,
The (B) modified polypeptide is at least one selected from a silylated polypeptide, a cationized polypeptide, and an acylated polypeptide,
The silylated polypeptide is a silylated hydrolyzed protein of at least one protein selected from keratin, soybean, wheat, sesame, silk, and collagen,
The cationized polypeptide is a cationized hydrolyzed protein of at least one protein selected from keratin, soybean, wheat, silk, collagen, and conchiolin,
The acylated polypeptide, hair elasticity improving agent characterized acylated hydrolyzed protein der Rukoto of at least one protein selected from soy and collagen. The hair elasticity improver according to claim 1, wherein the blending ratio of the (A) L-theanine and the (B) modified polypeptide is 1: 0.1 to 1000 as a mass ratio.