JP4585264B2 - Hair cosmetic composition - Google Patents

Description

  The present invention relates to a hair cosmetic composition containing a hair damage repair ingredient.

In recent years, with the diversification of hairstyles, hair is often treated with hair treatment agents such as hair dyes, bleaches, permanent wave agents, hair straighteners, etc., and the hair tends to be easily damaged. It is in. Hair cosmetic compositions that exhibit the effect of repairing damaged hair by being applied to such hair are known (see Patent Documents 1 to 3). For example, the hair cosmetic composition described in Patent Document 1 contains a protein hydrolyzate and an amino acid as a hair damage repair component. On the other hand, a skin external preparation containing L-theanine is known as a moisturizing agent for the skin (see Patent Document 4).
Japanese Patent Laid-Open No. 11-139941 JP-A-10-175824 JP-A-11-71240 Japanese Patent Laid-Open No. 9-286715

  By the way, in the hair cosmetic composition of the said patent documents 1-3, the repair effect of the damaged hair is acquired. However, it was not satisfactory about the sustainability of the repair effect. In addition, in the said patent document 4, there is no description regarding the effect of L-theanine with respect to hair, and such knowledge is not acquired from the patent document 4 at all.

  The present invention has been made in view of such conventional circumstances, and the purpose thereof is to contain L-theanine, thereby exhibiting a repair effect on damaged hair and sustaining the effect. Another object of the present invention is to provide a hair cosmetic composition that is also good.

In order to achieve the above object, the hair cosmetic composition of the invention described in claim 1 contains L-theanine (except for inclusion as a tea extract) as a hair damage repair ingredient. To do.
The hair cosmetic composition of the invention described in claim 2 is characterized in that, in the invention described in claim 1, it further contains a cationized polymer.

  The hair cosmetic composition of the invention described in claim 3 is characterized in that, in the invention described in claim 1 or 2, it further contains a silicone derivative.

  ADVANTAGE OF THE INVENTION According to this invention, while exhibiting a restoration effect with respect to the damaged hair, the durability of the effect can also be provided.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments embodying the present invention will be described in detail.
The hair cosmetic composition of this embodiment contains L-theanine as a hair damage repair component.
L-theanine is a derivative of L-glutamic acid and is a kind of amino acid. This L-theanine is a component that is abundantly contained in tea leaves, particularly 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 and synthetic L-theanine can be used in the hair cosmetic composition.

  The content of L-theanine in the hair cosmetic composition is preferably 0.001 to 5 mass%, more preferably 0.01 to 3 mass%. If the content is less than 0.001% by mass, damaged hair may not be efficiently repaired. On the other hand, even if it exceeds 5% by mass, there is a possibility that a further repair effect cannot be obtained.

  The cationized polymer is preferably blended in order to further exhibit the hair repair effect of L-theanine. This cationized polymer indicates a water-soluble polymer containing an amino group or ammonium group bonded to a polymer chain, or containing at least dimethyldiallylammonium halide as a constituent unit.

  Specific examples of the cationized polymer include cationic starch, cationized cellulose derivative, cationized guar gum derivative, dimethyldiallyl quaternary ammonium salt derivative, dimethyldiallyl quaternary ammonium salt / acrylamide copolymer, quaternized polyvinylpyrrolidone derivative and the like. Is mentioned.

  Examples of the cationized cellulose derivative include o- [2-hydroxy-3- (trimethylammonio) propyl] hydroxyethylcellulose chloride, and commercially available products such as Leogard (trade name) G and GP manufactured by Lion Corporation. Polymer JR-125, the same JR-400, the same JR-30M, the same LR-400, the same LR-30M, and the like manufactured by Union Carbide. Furthermore, examples of the cationized cellulose derivative include hydroxyethyl cellulose dimethyl diallylammonium chloride, and examples of commercially available products include Cellcoat (trade name) H-100 and L-200 manufactured by National Starch and Chemical Co., Ltd.

  Examples of the cationized guar gum derivative are described in JP-B-58-35640, JP-B-60-46158, and JP-A-58-53996. Product names) C-13S, C-14S, C-17, C-210, C-162, and HI-CARE1000. Examples of the dimethyldiallyl quaternary ammonium salt polymer include polydimethylmethylenepiperidinium chloride, and a commercially available product is Marcote (trade name) 100 manufactured by Ondeo Narco. Examples of the dimethyldiallyl quaternary ammonium salt / acrylamide copolymer include dimethyldiallyl ammonium chloride / acrylamide copolymer, and a commercially available dimethyldiallyl quaternary ammonium salt / acrylamide copolymer is manufactured by Ondeo Nalco. MERCOAT (trade name) 550 and the like. Examples of the quaternized polyvinyl pyrrolidone derivative include vinyl pyrrolidone / N, N-dimethylaminoethyl methacrylic acid copolymer diethyl sulfate and the like, and commercially available products such as Guff Coat (product) Name) 734, 755, and 755N. Among the quaternized polyvinyl pyrrolidone derivatives, those having a molecular weight of 10,000 to 2,000,000 are preferable from the viewpoint of good adhesion to hair and good hair feel.

  Other cationized polymers include methacrylic acid ester polymers, specifically 2-methacryloyloxyethyl phosphorylcholine polymer, 2-methacryloyloxyethyl phosphorylcholine polymer, 2-methacryloyloxyethyl phosphorylcholine / methacrylic acid. Examples thereof include butyl copolymer, 2-methacryloyloxyethyl phosphorylcholine · 2-hydroxy-3-methacryloyloxypropyltrimethylammonium chloride copolymer, and chlorocholine methacrylate polymer. Commercial products containing chloromethacrylic acid ester polymers include Salcare (trade name) SC95 and SC96, manufactured by Ciba Specialty Chemicals, and Lipidure (trade name) HM, PMB, and C manufactured by NOF Corporation. Etc. These cationized polymers may be blended singly or in combination of two or more.

  Among these cationized polymers, o- [2-hydroxy-3- (trimethylammonio) propyl] hydroxyethylcellulose chloride from the viewpoint that the hair repair effect is sufficiently exhibited by combining with L-theanine, Hydroxyethylcellulose dimethyldiallylammonium chloride, polydimethylmethylenepiperidinium chloride, dimethyldiallylammonium chloride / acrylamide copolymer, vinylpyrrolidone / N, N-dimethylaminoethyl methacrylic acid copolymer diethyl sulfate, and methacrylic acid chloride At least one selected from coalesces is preferred.

  The content of the cationized polymer in the hair cosmetic composition is preferably 0.001 to 5% by mass, more preferably 0.01 to 3% by mass, and still more preferably 0.1 to 1% by mass. If the content is less than 0.001% by mass, damaged hair may not be efficiently repaired. On the other hand, even if it exceeds 5% by mass, there is a possibility that a further repair effect cannot be obtained.

  The silicone derivative is preferably added to the hair whose damage has been repaired by L-theanine so as to improve the touchability of the hair and thereby improve the feel of the hair. Specific examples of silicone derivatives include dimethyl silicone, methylphenyl silicone, cyclic dimethyl silicone, cyclic silicone, methyl hydrogen silicone, amino-modified silicone, ammonium-modified silicone, terminal hydroxyl group-modified dimethylpolysiloxane, alcohol-modified silicone, and aliphatic alcohol-modified. Examples thereof include silicone, alkyl-modified silicone, polyether-modified silicone, epoxy-modified silicone, and fluorine-modified silicone. Specifically, octamethylcyclotetrasiloxane, octamethyltrisiloxane, methylpolysiloxane (dimethicone), dimethylsiloxane / methylstearoxysiloxane copolymer, dimethylsiloxane / methylcetyloxysiloxane copolymer, stearoxytrimethylsilane, Stearoxymethyl polysiloxane, decamethylcyclopentasiloxane, decamethyltetrasiloxane, tetradecamethylcycloheptasiloxane, tetradecamethylhexasiloxane, tetrahydrotetramethylcyclotetrasiloxane, dodecamethylcyclohexasiloxane, tris (tributoxysiloxy) Methylsilane, trimethylsiloxysilicic acid, bisphenyldodecamethylhexasiloxane, hexadecylmethylcyclopolysiloxane, Samethylcyclotrisiloxane, hexamethyldisiloxane, poly (oxyethylene / oxypropylene) methylpolysiloxane copolymer, polyoxyethylene / methylpolysiloxane copolymer, polyoxypropylene / methylpolysiloxane copolymer, polymethacryl Methyl / dimethylpolysiloxane graft copolymer, methylcyclopolysiloxane, methylhydrogenpolysiloxane, methylphenylpolysiloxane, methylpolysiloxane / cetylmethylpolysiloxane / poly (oxyethylene / oxypropylene) methylpolysiloxane copolymer And poly (oxyethylene / oxypropylene) / butylene / methylpolysiloxane copolymer.

  These silicone derivatives may be blended singly or in combination of two or more. Among these silicone derivatives, it is possible to improve the fingering of the hair without inhibiting the action of L-theanine, so that methylpolysiloxane, octamethyltrisiloxane, decamethylcyclopentasiloxane and methylphenylpolysiloxane It is preferably at least one selected from

  The content of the silicone derivative in the hair cosmetic composition is preferably 0.001 to 10% by mass, more preferably 0.01 to 8% by mass, and still more preferably 0.1 to 7% by mass. If the content is less than 0.001% by mass, it may be difficult to efficiently improve the fingering property. On the other hand, if it exceeds 10% by mass, it is difficult to obtain a further improvement effect and the hair may become sticky.

In the hair cosmetic composition, an oily component, a hydrocarbon, a surfactant, a pH adjuster and the like can be blended as other components.
The oil component is preferably blended from the viewpoint of imparting moisture to the hair. Examples of the oil component include polyhydric alcohols, fats and oils, waxes, higher alcohols, higher fatty acids, alkyl glyceryl ethers, esters and the like.

  Examples of the polyhydric alcohol include glycols and glycerins. Examples of glycols include ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, dipropylene glycol, isoprene glycol, and 1,3-butylene glycol. Examples of glycerins include glycerin, diglycerin, and polyglycerin.

  As fats and oils, olive oil, camellia oil, shea fat, almond oil, tea seed oil, sasanqua oil, safflower oil, sunflower oil, soybean oil, cottonseed oil, sesame oil, beef fat, cacao butter, corn oil, peanut oil, rapeseed oil, Examples include rice bran oil, rice germ oil, wheat germ oil, pearl barley oil, grape seed oil, avocado oil, carrot oil, macadamia nut oil, castor oil, flaxseed oil, coconut oil, mink oil, egg yolk oil and the like. Examples of waxes include beeswax, candelilla wax, carnauba wax, jojoba oil, and lanolin.

  Higher alcohols include lauryl alcohol, myristyl alcohol, cetyl alcohol (cetanol), stearyl alcohol, cetostearyl alcohol, aralkyl alcohol, behenyl alcohol, 2-hexyldecanol, isostearyl alcohol, 2-octyldodecanol, decyltetradecanol, oleyl Alcohol, linoleyl alcohol, linolenyl alcohol, lanolin alcohol, etc. are mentioned. Examples of higher fatty acids include lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, isostearic acid, hydroxystearic acid, 12-hydroxystearic acid, oleic acid, undecylenic acid, linoleic acid, ricinoleic acid, and lanolin fatty acid. It is done.

  Examples of the alkyl glyceryl ether include batyl alcohol (monostearyl glyceryl ether), chimyl alcohol (monocetyl glyceryl ether), selachyl alcohol (monooleyl glyceryl ether), and isostearyl glyceryl ether.

  Esters include diisopropyl adipate, diisobutyl adipate, dioctyl adipate, 2-hexyldecyl adipate, diisostearyl adipate, isopropyl myristate, cetyl octanoate, cetyl isooctanoate, isononyl isononanoate, isodecyl isononanoate , Isotridecyl isononanoate, diisopropyl sebacate, octyldodecyl myristate, isopropyl palmitate, butyl stearate, stearyl stearate, hexyl laurate, myristyl myristate, decyl oleate, hexyldecyl dimethyloctanoate, triisodecyl myristate, myristic acid Isostearyl, 2-ethylhexyl palmitate, octyldodecyl ricinoleate, fatty acid (C10-30) (choleste Lanylyl), lauryl lactate, cetyl lactate, myristyl lactate, octyldodecyl lactate, lanolin acetate, isocetyl stearate, isocetyl isostearate, cholesteryl 12-hydroxystearate, ethylene glycol di-2-ethylhexanoate, dipentaerythritol fatty acid Examples thereof include esters, N-alkyl glycol monoisostearate, cetyl caprate, glyceryl tricaprylate, neopentyl glycol dicaprate, diisostearyl malate, and lanolin derivatives. These oil components may be blended alone or in combination of two or more. The content of the oil component is preferably 0.01 to 50% by mass, more preferably 0.1 to 30% by mass.

  Examples of the hydrocarbon include α-olefin oligomer, light isoparaffin, light liquid isoparaffin, liquid isoparaffin, liquid paraffin, squalane, polybutene, paraffin, polyethylene powder, microcrystalline wax, petrolatum and the like.

Examples of the surfactant include nonionic surfactants, cationic surfactants, anionic surfactants, and amphoteric surfactants.
Specific examples of the nonionic surfactant include polyoxyethylene (hereinafter referred to as POE) alkyl ethers, POE alkylphenyl ethers, POE / polyoxypropylene alkyl ethers, POE sorbitan fatty acid esters, POE propylene glycol fatty acid. Examples thereof include esters and aliphatic alkanolamides.

  Cationic surfactants include lauryl trimethyl ammonium chloride, cetyl trimethyl ammonium chloride, stearyl trimethyl ammonium chloride, alkyl trimethyl ammonium chloride, distearyl dimethyl ammonium chloride, cetyl trimethyl ammonium bromide, stearyl trimethyl ammonium bromide, ethyl lanolin sulfate fatty acid Examples thereof include aminopropylethyldimethylammonium, stearyltrimethylammonium saccharin, cetyltrimethylammonium saccharin, and methyl behenyltrimethylammonium sulfate.

  Examples of anionic surfactants include alkyl sulfates such as sodium lauryl sulfate, POE alkyl sulfates such as POE lauryl ether sodium sulfate, alkyl sulfate esters such as lauryl sulfate triethanolamine, stearoylmethyl taurine sodium, dodecylbenzenesulfonic acid Examples include triethanolamine, sodium tetradecenesulfonate, POE lauryl ether phosphate and salts thereof, N-lauroyl glutamates, and N-lauroylmethyl-β-alanine salts.

  Examples of amphoteric surfactants include 2-undecyl-N-carboxymethyl-N-hydroxyethylimidazolinium betaine sodium, cocoamidopropyl betaine, lauryldimethylaminoacetic acid betaine.

  Examples of the pH adjuster include citric acid and 2-amino-2-methyl-1-propanol. In addition, water is blended in the hair cosmetic composition as a solvent or dispersion medium for each component described above, and the concentration of each component is adjusted. The pH of the hair cosmetic composition is preferably weakly acidic, that is, pH 3 or more and less than 7 (25 ° C.). By making the pH weakly acidic, the effect of repairing hair by L-theanine can be sufficiently exerted.

  Furthermore, as other components, water-soluble polymers other than cationized polymers such as carboxyvinyl polymer, preservatives such as methylparaben and phenoxyethanol, chelating agents, and fragrances can be blended.

  The hair cosmetic composition can be made into liquid, mist, gel, foam, cream and other dosage forms. This hair cosmetic composition is used as a hair care agent for shampoo, rinse, treatment and the like. This hair cosmetic composition may be used after being applied to the hair and washed off with water or warm water, or the same composition adhering to the hair may be used without being washed away with water or warm water. From the viewpoint that the sustainability in the hair repair effect can be sufficiently exhibited, it is preferable to use the hair cosmetic composition after applying it to the hair without washing it away with water or warm water.

  This hair cosmetic composition is applied to hair treated with a hair treatment such as an oxidative hair dye, an acid hair dye, a bleaching agent, a permanent wave agent, a hair straightener, etc. Even when applied to hair damaged by factors other than the hair treatment agent, such as ultraviolet rays, the effect can be exhibited.

  Now, the hair cosmetic composition is prepared by blending L-theanine as a hair damage repair component, blending a cationized polymer, a silicone derivative, and the like as necessary, and mixing each component. This hair cosmetic composition is used by applying an appropriate amount to hair damaged by, for example, hair dyeing with an oxidative hair dye. In such hair, hair keratin is damaged due to, for example, alteration of amino acids typified by reductive opening of cystine bonds, elution of amino acids due to degradation of hair keratin, and the like. At this time, L-theanine contained in the hair cosmetic composition acts on the damaged portion of hair keratin. That is, it is speculated that L-theanine acts effectively as a hair damage repair component by exerting a binding force such as a hydrogen bond or a hydrophobic bond to damaged hair keratin. Furthermore, it is speculated that the binding state of L-theanine to the hair keratin is stable.

According to the embodiment described in detail above, the following effects are exhibited.
-The hair cosmetic composition of this embodiment contains L-theanine as a hair damage repair component. This L-theanine is presumed to act effectively on the damaged part of hair keratin, and exerts a repairing effect on the damaged hair. Furthermore, the binding state of L-theanine to such hair is assumed to be stable, and the persistence of the repair effect is also good. In particular, even if this hair cosmetic composition is applied to dyed hair, it is less likely to be affected by the color fading, etc. It can be demonstrated.

  -It is preferable that the hair cosmetic composition of this embodiment contains a cationized polymer further. When comprised in this way, it is estimated that the film formation ability of a cationized polymer is fully exhibited by containing with L-theanine, and the repair effect of a damaged part is further exhibited.

  -It is preferable that the hair cosmetic composition of this embodiment contains a silicone derivative further. When comprised in this way, it is estimated that the frictional resistance of the hair restored | repaired with L-theanine is reduced, and the touch of hair can be made favorable by improving the finger's permeability of hair.

In addition, the said embodiment can also be changed and comprised as follows.
-At least one of the cationized polymer and the silicone derivative may be omitted.

  -You may contain amino acids other than the said L-theanine, and its derivative (s). The amino acids and derivatives thereof include glycine, sarcosine, dimethylglycine, betaine, alanine, β-alanine, α-aminobutyric acid, β-aminobutyric acid, γ-aminobutyric acid, γ-amino-β-oxobutyric acid, valine, β -Aminoisovaleric acid, γ-aminoisovaleric acid, norvaline, β-aminovaleric acid, γ-aminovaleric acid, δ-aminovaleric acid, leucine, isoleucine, norleucine, serine, α-methylserine, isoserine, α-methylisoserine , Cycloserine, homoserine, threonine, o-methylthreonine, allothreonine, o-methylallothreonine, roseonin, trans-3-aminocyclohexanecarboxylic acid, cis-3-aminocyclohexanecarboxylic acid, ε-aminecaproic acid, ω-amino Dodecanoic acid, β-hydroxyvaline, α-hydride Roxy-β-aminoisovaleric acid, cysteine, cystine, S-methylcysteine, S-methylcysteine-S-oxide, cysteic acid, homocysteine, homocystin, methionine, penicillamine, taurine, α, β-diaminopropionic acid, ornithine, Lysine, arginine, canalin, canavanine, δ-hydroxylysine, aspartic acid, asparagine, isoasparagine, glutamic acid, glutamine, isoglutamine, α-methylglutamic acid, β-hydroxyglutamic acid, γ-hydroxyglutamic acid, α-aminoadipic acid, citrulline , Lanthionine, cystathionine, phenylalanine, α-methylphenylalanine, o-chlorophenylalanine, m-chlorophenylalanine, p-chlorophenylalanine, o-fluoro Phenylalanine, m-fluorophenylalanine, p-fluorophenylalanine, β- (2-pyridyl) alanine, tyrosine, thyronine, dichlorotyrosine, dibromotyrosine, diiodotyrosine, 3,4-dihydroxyphenylalanine, α-methyl-3,4 -Dihydroxyphenylalanine, phenylglycine, tryptophan, abrin, histidine, 1-methylhistidine, 2-mercaptohistidine, proline, hydroxyproline, anthranilic acid, paraminol and salts thereof.

Next, the embodiment will be described more specifically with reference to examples and comparative examples.
(Examples 1-11, Comparative Examples 1-3)
First, a human black hair bundle subjected to hair dyeing treatment with an oxidative hair dye is prepared. The oxidative hair dye is composed of a first agent containing an oxidative dye and an alkali agent, and a second agent containing an oxidant. These 1st agent and 2nd agent were mixed by mass ratio of 1: 1, and after applying the mixture to a human black hair bundle, it was left to stand for 20 minutes. Thereafter, the mixture adhering to the human black hair bundle was washed with water and dried to give the human black hair bundle a hair dyeing treatment. The composition of the oxidative hair dye is as shown below.
<Oxidative hair dye>
(First agent) Mass%
Paraphenylenediamine 0.2
Resorcin ... 1.0
Paraaminophenol ... 0.5
2,6-diaminopyridine ... 0.2
Cetyl alcohol ... 5.0
Polyethylene glycol ... 5.0
Polyoxyethylene (20) cetyl ether, 8.0
Sodium dodecyl sulfate
Strong ammonia water (28%) …… 5.0
Ascorbic acid 0.5
Purified water ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Remaining amount (second agent)
Hydrogen peroxide (35%) ... 17.0
Purified water ............... Remaining amount Next, human hair compositions prepared in the examples shown in Table 1 and subjected to hair dyeing treatment were prepared. Each black hair bundle was applied and blended into the hair bundle. In Table 1, the unit of the numerical value indicating the blending amount of each component indicates mass%, (A) indicates a cationized polymer, and (B) indicates a silicone derivative.

Using the human black hair bundle thus treated with the oxidative hair dye and the hair cosmetic composition, the following hair repair performance and feel are evaluated, and the evaluation results are also shown in Table 1.
<Hair repair performance>
(Strength evaluation)
About the human black hair bundle before and after processing with the hair cosmetic 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 increase in the value The rate was the strength increase rate (%). From the obtained strength increase rate, the strength of the hair was evaluated according to the following criteria.

Excellent (◎): Strength increase rate is 9% or more, Good (◯): Strength increase rate is 7% or more and less than 9%, slightly bad (△): Strength increase rate is 5% or more and less than 7%, Defective (×) : Strength increase rate is less than 5%.
(Sustainability assessment)
The human black hair bundle treated with the hair cosmetic composition of each example was stored for 5 days in a constant temperature and humidity chamber (25 ° C., relative humidity 55%), and then the breaking stress value was measured in the same manner as in the above strength evaluation. The sustainability was calculated from the breaking stress values according to the following equation.

Sustain rate (%) = [(fracture stress value after 5 days) / (fracture stress value immediately after treatment)] × 100
Based on the obtained sustainability rate, sustainability was evaluated according to the following criteria.
Excellent (◎): Sustain rate is 98% or more, Good (○): Sustain rate is 97% or more and less than 98%, Slightly poor (△): Sustain rate is 95% or more and less than 97%, Poor (x): Sustain rate Is less than 95%.
<Feel>
(Moist feeling)
Regarding the human black hair bundle treated with the hair cosmetic 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. An average score is calculated for the scoring results of five panelists, and when the average score is 3.6 points or more, “Excellent: ◎”, when 2.6 points or more and 3.5 points or less, “Good: ○” In the case of 1.6 points or more and 2.5 points or less, “slightly bad: Δ” and in the case of 1.5 points or less were “bad: ×”, and the evaluation results of moist feeling were obtained.
(Fingering)
Regarding the human black hair bundle treated with the hair cosmetic composition of each example, five panelists pass fingers, 4 points when the finger is very good, 3 points when it is good, 2 points when it is slightly bad, and Scoring was done in 4 stages, with 1 case being bad. An average score is calculated for the scoring results of five panelists, and when the average score is 3.6 points or more, “Excellent: ◎”, when 2.6 points or more and 3.5 points or less, “Good: ○” In the case of 1.6 points or more and 2.5 points or less, “slightly bad: Δ” and in the case of 1.5 points or less were “bad: ×”, and the evaluation results of the fingering property were obtained.

表１に示す結果から明らかなように、各実施例ではＬ−テアニンが含有されているため、強度評価及び持続性評価の結果は優れる又は良好である。よって、Ｌ−テアニンによる毛髪の修復効果が発揮され、かつその持続性も良好であることがわかる。その結果、うるおい感の評価結果も、優れる又は良好である。特に、実施例１〜８では、（Ａ）カチオン化ポリマーが含有されているため、強度評価の結果が優れている。また、実施例１〜８、及び実施例１０では、（Ｂ）シリコーン誘導体が含有されているため、指通り性の評価結果が優れている。各実施例に対して、各比較例ではＬ−テアニンが含有されていないため、強度評価の結果が不良となっている。また、比較例３はアミノ酸の一種であるＬ−グルタミン酸を含有している。しかしながら、比較例３の強度評価は悪い結果を示している。従って、アミノ酸の中でも各実施例におけるＬ−テアニンは毛髪損傷修復成分として特異的に作用することがわかる。

As is apparent from the results shown in Table 1, since each example contains L-theanine, the results of strength evaluation and sustainability evaluation are excellent or good. Therefore, it turns out that the repair effect of the hair by L-theanine is exhibited and its sustainability is also favorable. As a result, the evaluation result of moisture feeling is excellent or good. In particular, in Examples 1 to 8, since the (A) cationized polymer is contained, the strength evaluation results are excellent. Moreover, in Examples 1-8 and Example 10, since the (B) silicone derivative is contained, the evaluation result of fingering property is excellent. In contrast to each example, since each comparative example does not contain L-theanine, the result of strength evaluation is poor. Comparative Example 3 contains L-glutamic acid which is a kind of amino acid. However, the strength evaluation of Comparative Example 3 shows a bad result. Therefore, it can be seen that among amino acids, L-theanine in each Example acts specifically as a hair damage repair component.

Claims (3)

A hair cosmetic composition comprising L-theanine (except for inclusion as a tea extract) as a hair damage repair component. Furthermore, the hair cosmetic composition of Claim 1 containing a cationized polymer. Furthermore, the hair cosmetic composition of Claim 1 or Claim 2 containing a silicone derivative.