JP2010006724A - Hair strengthening agent, hair cosmetic composition containing the hair strengthening agent and hair strengthening method using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hair strengthening agent that supplies damaged hair with a sufficient hair strengthening effect and has excellent durability of the effect, a hair cosmetic composition and a hair strengthening method using the same. <P>SOLUTION: The hair strengthening agent includes citrullines as active ingredients. The hair cosmetic composition includes the hair strengthening agent. The hair strengthening method includes applying the hair cosmetic composition to the hair. Preferably the hair cosmetic composition includes further a nitrogen-containing polymer such as a cationized cellulose derivative, a dimethyl diallyl quaternary ammonium salt derivative, an amino modified silicone, a polypeptide, etc. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a hair strengthening agent, a hair cosmetic composition containing the hair strengthening agent, and a hair strengthening method using the same.

In recent years, with the diversification of hairstyles, the chances of hair being treated with hair treatment agents such as hair dyes, bleaches, permanent wave agents, hair straighteners, etc. have increased, and the hair has been damaged and cut. There is a tendency to become weaker. There is known a hair cosmetic composition that is applied to such hair and exhibits the effect of strengthening the weakened hair. For example, Patent Document 1 discloses an amino acid having a proton-releasable anionic functional group selected from aspartic acid or glutamic acid, and an amino acid having a proton-acceptable cationic functional group selected from L-arginine, creatine, creatinine and the like. Disclosed are hair cosmetics containing the same. Patent Document 2 discloses a hair treatment composition containing a combination of an amino acid having an aliphatic side chain and an amino acid having a basic side chain.
JP 2004-346040 A Special table 2003-500345 gazette

On the other hand, as hair cosmetics containing citrulline, hair growth promoters and hair moisturizers as described in Patent Documents 3 to 5, melanin production inhibitors based on the action of removing active oxygen, and the like are known. Yes. In addition, Patent Document 6 discloses a technique for repairing damaged portions of hair with a polymer having citrulline in the side chain.
JP-T 8-502509 JP 2002-226370 A JP 2007-197360 A International Publication No. 2000/032560 Pamphlet

  By the way, in the hair cosmetic composition of the said patent documents 1-2, although the hair reinforcement effect is acquired, the reinforcement effect is only temporary and the subject that it is not satisfactory about persistence exists. . The above-mentioned patent document 3 relates to the use of citrulline as a metabolic intermediate of the urea cycle in hair follicles involved in hair generation, and does not suggest any application to damaged hair. Neither of its actions is disclosed. Patent Documents 4 and 5 do not disclose any action of citrulline on hair as an active ingredient. Patent Document 6 discloses that a (meth) acrylic acid-based polymer in which amino acid residues having a high adsorptivity to proteins are arranged in a pendant form is adsorbed favorably on the damaged part of the skin or hair. A technique for repairing is disclosed. However, this technique effectively adsorbs the (meth) acrylic acid polymer to the skin and hair, and exhibits a repair action by the polymer, and no amino acids are involved. Citrulline is only listed as an example of various amino acids, and no action is disclosed on citrulline on hair as an active ingredient among various amino acids. In addition, since the main chain is a polymer (meth) acrylic acid polymer that is known to have a high film-forming property, there is a concern that the touch after hair application may deteriorate.

  The present invention has been made in view of such conventional circumstances, and its purpose is to strengthen hair that has been damaged and weakened without impairing the feel, and has a long-lasting reinforcing effect. Another object of the present invention is to provide a hair cosmetic composition containing the reinforcing agent and a hair strengthening method using the hair cosmetic composition.

  In order to achieve the above object, the hair strengthening agent of the invention described in claim 1 is characterized in that one or more selected from citrulline and salts thereof are used as active ingredients.

  The gist of the hair cosmetic composition of the invention according to claim 2 is that it contains the hair strengthening agent according to claim 1.

  The gist of the hair cosmetic composition of the invention of claim 3 is the hair cosmetic composition of claim 1 containing a nitrogen-containing polymer.

  The gist of the hair strengthening method of the invention described in claim 4 is that the hair cosmetic composition of claim 2 or 3 is applied to the hair.

  According to the present invention, it is possible to provide a hair strengthening agent, a hair cosmetic composition, and a hair strengthening method for strengthening damaged and weakened hair and improving the sustainability of the effect.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments embodying the present invention will be described in detail.

  The hair strengthening agent of the present embodiment contains one or more selected from citrulline and salts thereof (hereinafter referred to as citrulline) as an active ingredient. Citrulline is a substance widely known to be produced in the process of nitrogen metabolism in animals. Citrulline is involved in the biosynthesis of urea and is known to be one of the intermediates of the urea cycle, and is also a kind of amino acid represented by the following formula (I), which is also included in cucurbitaceae plants such as watermelon. is there.

  As citrulline used in the present invention, synthetic origin obtained by chemical synthesis can be used in addition to natural origin obtained from plants containing these citrulline.

  As citrulline used in the present invention, L form is preferably used, but D form or racemic form can also be used.

  As the citrulline used in the present invention, any of a free form, an acid addition salt and a base salt can be used. Acid addition salts include inorganic acid salts such as hydrochloride, hydrobromide, sulfate, nitrate and phosphate, and organic acid salts such as methanesulfonate, toluenesulfonate, maleate and fumarate Is mentioned. Examples of the basic salt include metal salts such as sodium salt, potassium salt and copper salt, and weak base salts such as triethanolamine salt and ammonium salt.

  The hair cosmetic composition of this embodiment contains citrulline, which is an active ingredient of a hair strengthening agent. Although total content of citrulline is arbitrary, Preferably it is 0.0001-3 mass%, More preferably, it is 0.001-1 mass%. If this content is less than 0.0001% by mass, the hair strengthening effect may not be sufficiently imparted. On the other hand, if the content exceeds 3% by mass, the feel of hair may be impaired.

  The hair cosmetic composition of this embodiment contains a nitrogen-containing polymer in addition to the hair strengthening agent. In addition to citrulline, which is an active ingredient of a hair strengthening agent, a nitrogen-containing polymer further enhances the hair strengthening effect through synergistic effects with citrulline and improves the durability of the hair strengthening effect. It is preferable to contain in a thing.

  This nitrogen-containing polymer means a polymer having a nitrogen atom on the polymer main chain, or containing a nitrogen atom as an amino group, an ammonium group, an amide group or the like in a modifying group bonded to a side chain, Any of natural and synthetic sources can be used. Specific examples of the nitrogen-containing polymer include cationized cellulose derivatives, cationized guar gum derivatives, dimethyldiallyl quaternary ammonium salt derivatives, quaternized polyvinylpyrrolidone derivatives, amino-modified silicones, polypeptides, and the like.

  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 derivative include polydimethylmethylenepiperidinium chloride and derivatives thereof, and commercially available products such as Marcote (trade name) 100, 550, 280, 295, plus 3330 manufactured by Ondeo Nalco. Plus 3331 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.

  Examples of the amino-modified silicone include amodimethicone, (aminoethylaminopropylmethicone / dimethicone) copolymer, aminopropyl dimethicone, highly polymerized aminopropyl dimethicone, and quaternium-80 (INCI name).

  Polypeptides include proteins derived from various animals and plants such as collagen, keratin, silk, wheat, soybean, sesame, almond, eggshell membranes and their hydrolysates, quaternized derivatives, silylated derivatives, acyls of the hydrolysates. And the like.

  Other nitrogen-containing polymers include cationized starch, methacrylic acid ester polymers, and chitin / chitosans. Examples of the methacrylic acid ester polymers include 2-methacryloyloxyethyl phosphorylcholine polymer, 2-methacryloyloxyethyl phosphorylcholine polymer, 2-methacryloyloxyethyl phosphorylcholine / butyl methacrylate copolymer, 2-methacryloyloxyethyl phosphorylcholine, 2- Examples thereof include hydroxy-3-methacryloyloxypropyltrimethylammonium chloride copolymer and chlorocholine methacrylate polymer. Commercial products containing methacrylic acid ester polymers include Salcare (trade name) SC95 and SC96 manufactured by Ciba Specialty Chemicals, Lipidure (trade name) HM, PMB, C manufactured by NOF Corporation, etc. Is mentioned.

  These nitrogen-containing polymers may be contained alone in the hair cosmetic composition, or may be contained in combination of two or more. Among these nitrogen-containing polymers, O- [2-hydroxy-3- (trimethylammoni chloride) chloride is more effective in improving the hair strengthening effect due to the synergistic effect with citrulline and improving the sustainability. E) Propyl] hydroxyethylcellulose, hydroxyethylcellulose dimethyldiallylammonium chloride, polydimethylmethylenepiperidinium chloride, dimethyldiallylammonium chloride / acrylamide copolymer, vinylpyrrolidone / N, N-dimethylaminoethylmethacrylic acid copolymer diethyl sulfate , Polymethacryloyloxyethyltrimethylammonium chloride, amodimethicone, highly polymerized aminopropyl dimethicone, (aminoethylaminopropylmethicone / dimethicone) copolymer, 2-methacryloyloxy Ethyl phosphorylcholine-2-hydroxy-3-methacryloyloxy propyl trimethyl ammonium chloride copolymer, hydrolyzed keratin, silylated hydrolyzed keratin, at least one selected from quaternized hydrolyzed wheat protein preferred.

  The nitrogen-containing polymer content in the hair cosmetic composition is arbitrary, but 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. It is. There exists a possibility that a synergistic effect with citrulline cannot fully be exhibited as this content is less than 0.001 mass%. On the other hand, when it contains exceeding 5 mass%, there exists a possibility of causing the deterioration of touch, such as hair becoming stiff.

  The hair cosmetic composition optionally contains, as other components, oily ingredients, surfactants, pH adjusters, and other components that are usually used in hair cosmetic compositions as long as the object of the present invention is not impaired. Can do.

  The hair cosmetic composition preferably contains an oil component from the viewpoint of imparting moist feeling to the hair. Examples of the oil component include silicone derivatives, polyhydric alcohols, fats and oils, waxes, higher alcohols, higher fatty acids, alkyl glyceryl ethers, esters, hydrocarbons and the like.

  Specific examples of silicone derivatives include dimethyl silicone, methyl phenyl silicone, cyclic silicone, methyl hydrogen silicone, terminal hydroxyl group-modified dimethyl polysiloxane, polyether-modified silicone, alcohol-modified, excluding components corresponding to the nitrogen-containing polymer. Examples thereof include silicone, alkyl-modified silicone, epoxy-modified silicone, and fluorine-modified silicone. Specifically, octamethyltrisiloxane, decamethyltetrasiloxane, dodecamethylpentasiloxane, tetradecamethylhexasiloxane, dimethylpolysiloxane (dimethicone), highly polymerized dimethylpolysiloxane (silicone gum), methylphenylpolysiloxane, decamethyl Cyclopentasiloxane, dodecamethylcyclohexasiloxane, tetradecamethylcycloheptasiloxane, tetrahydrotetramethylcyclotetrasiloxane, methylhydrogenpolysiloxane, stearoxytrimethylsilane, tris (tributoxysiloxy) methylsilane, trimethylsiloxysilicate, poly (Oxyethylene / oxypropylene) methylpolysiloxane copolymer, polyoxyethylene / methylpolysiloxane copolymer, poly Xylpropylene / methylpolysiloxane copolymer, methylpolysiloxane / cetylmethylpolysiloxane / poly (oxyethylene / oxypropylene) methylpolysiloxane copolymer, poly (oxyethylene / oxypropylene) / butylene / methylpolysiloxane copolymer Examples thereof include dimethylsiloxane / methylstearoxysiloxane copolymer, dimethylsiloxane / methylcetyloxysiloxane copolymer, polyglyceryl-3disiloxane dimethicone (INCI name), and the like.

  The hair cosmetic composition may contain these silicone derivatives alone or in combination of two or more. Among these silicone derivatives, it is possible to improve the gloss of hair without inhibiting the action of citrulline, which is an active ingredient of a hair strengthening agent, so that dimethylpolysiloxane, highly polymerized dimethylpolysiloxane, octamethyl It is preferably at least one selected from trisiloxane, decamethylcyclopentasiloxane, and methylphenylpolysiloxane.

  Examples of the polyhydric alcohol include glycols and glycerins. Examples of glycols include ethylene glycol, diethylene glycol, polyethylene 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, hexyl decyl dimethyloctanoate, triisodecyl myristate, myristic acid Isostearyl, 2-ethylhexyl palmitate, octyldodecyl ricinoleate, fatty acid (C10-30) (choleste / Lanosteryl lactate), 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.

  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.

  The hair cosmetic composition may contain these oily components 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 surfactant include nonionic surfactants, cationic surfactants, anionic surfactants, and amphoteric surfactants.

  Specific examples of nonionic surfactants include POE alkyl ethers such as polyoxyethylene (hereinafter referred to as POE) lauryl ether, POE cetyl ether, POE stearyl ether, POE alkylphenyl ethers, POE polyoxypropylene alkyl Examples include ethers, POE sorbitan fatty acid esters, POE propylene glycol fatty acid esters, and aliphatic alkanolamides.

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

  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, the hair cosmetic composition contains water as a solvent or dispersion medium for the above components, 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 effects of citrulline can be sufficiently exhibited.

  The hair cosmetic composition includes, as other components, water-soluble polymers (hydroxyethylcellulose, carboxyvinyl polymer, etc.) excluding the nitrogen-containing polymer, preservatives such as sodium benzoate, methylparaben, phenoxyethanol, oxybenzone and methoxycinnamon. Ultraviolet absorbers such as octyl acid, chelating agents such as edetate and hydroxyethane diphosphonate, and fragrances can be contained.

  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 such as shampoo, rinse, treatment, styling agent, and hair tonic. 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 of the hair strengthening effect can be sufficiently exhibited, it is preferable to use the composition without applying it to water or warm water after the hair cosmetic composition is applied to the hair.

  This hair cosmetic composition is applied to hair damaged by hair treatment agents such as oxidative hair dyes, bleaching agents, permanent wave agents, hair straighteners, and other factors, such as ultraviolet rays. By applying to hair damaged by such as, hair strengthening effect can be exhibited. In addition, when used as a pre- and post-hair dyeing treatment for oxidative hair dyes, acidic hair dyes, etc., it exhibits a hair strengthening effect and at the same time improves the dye retention in hair, improves the hair dyeing property, and suppresses fading Also demonstrates.

  Now, the hair cosmetic composition contains citrulline as an active ingredient of a hair strengthening agent, and also contains a nitrogen-containing polymer and the like as required, and is prepared by 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, citrulline which is an active ingredient of the hair strengthening agent acts on the damaged portion of hair keratin. That is, it is speculated that citrulline acts effectively as a hair strengthening component inside the hair by exerting a binding force such as a hydrogen bond or a hydrophobic bond to damaged hair keratin. Furthermore, the binding state of citrulline to the hair keratin is presumed to be stable.

  According to the embodiment described in detail above, the following effects are exhibited.

  -The hair strengthening agent of this embodiment uses citrulline as an active ingredient. This citrulline is presumed to act effectively on the damaged part of hair keratin, and exerts a hair strengthening effect on the damaged hair. Furthermore, the binding state of citrulline to such hair is assumed to be stable, and the durability of the hair strengthening effect is also good.

  -When the hair strengthening agent of this embodiment is applied to hair as a pre- and post-dyeing treatment, the hair strengthening effect and its sustainability are fully exhibited, and at the same time, the hair dyeing property is improved, and the fading prevention effect Can be demonstrated.

  -It is preferable that the hair cosmetic composition containing the hair strengthening agent of this embodiment further contains a nitrogen-containing polymer. When configured in this way, it is presumed that the nitrogen-containing polymer will produce a synergistic effect on the hair by containing it together with citrulline, which is an active ingredient of the hair strengthening agent, and the durability of the hair strengthening effect is further improved. To do.

  In addition, the said embodiment can also be changed and comprised as follows.

  -The hair cosmetic composition may contain amino acids other than citrulline, salts thereof and derivatives thereof. Amino acids, salts thereof 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 , L-theanine, 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 -Amine caproic acid, ω-aminododecanoic acid β-hydroxyvaline, α-hydroxy-β-aminoisovaleric acid, cysteine, cystine, S-methylcysteine, S-methylcysteine-S-oxide, cysteic acid, homocysteine, homocystin, methionine, penicillamine, taurine, α, β -Diaminopropionic acid, ornithine, lysine, L-arginine, canalin, canavanine, δ-hydroxylysine, aspartic acid, asparagine, isoasparagine, glutamic acid, glutamine, isoglutamine, α-methylglutamic acid, β-hydroxyglutamic acid, γ-hydroxy Glutamic acid, α-aminoadipic acid, ectoine, lanthionine, cystathionine, phenylalanine, α-methylphenylalanine, o-chlorophenylalanine, m-chlorophenylalanine, p-c Rophenylalanine, o-fluorophenylalanine, m-fluorophenylalanine, p-fluorophenylalanine, β- (2-pyridyl) alanine, tyrosine, thyronine, dichlorotyrosine, dibromotyrosine, diiodotyrosine, 3,4-dihydroxyphenylalanine, α- Examples include 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 1-14, Comparative Examples 1-4)
As an experimental hair bundle, a human black hair bundle treated with a persulfate-containing bleach was prepared. The persulfate-containing bleaching agent uses a commercially available product (Hoyu Powder Bleach manufactured by Hoyu Co., Ltd.) composed of a powdery first agent containing a persulfate and a second agent containing an oxidizing agent. The human black hair bundle was decolorized according to a conventional method to obtain an experimental hair bundle. These experimental hair bundles were gold. In addition, it was confirmed that the tensile strength was lower than before the treatment using a tensile tester described later. Next, the hair treatment of each example shown in Table 1 is prepared, and is applied to each experimental hair bundle, and allowed to stand for 60 minutes in an atmosphere of a constant temperature and humidity chamber (25 ° C., relative humidity 30%). Then, it used for the below-mentioned experiment. In addition, unless otherwise indicated, the unit of the numerical value which shows content of each component in prescription described below including Table 1 means the mass%.

  Using the experimental hair bundle, the following evaluations on the hair strengthening effect and feel were performed. The evaluation results are also shown in Table 1.

<Hair enhancement effect>
(Strength increase rate)
Before and after treatment with the non-washing hair treatment of each example, the tensile stress tester (Tensilon (trade name) UTM-II, manufactured by Toyo Baldwin) was used to measure the breaking stress value of the experimental hair bundle. The increase rate was defined as the strength increase rate (%). The obtained strength increase rate 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%.

(Strength duration)
After the experimental hair bundle treated with the hair treatment not washed off in each case was stored in a constant temperature and humidity chamber (25 ° C., relative humidity 55%) for 5 days, the breaking stress value was measured in the same manner as the strength increase rate evaluation described above. did. The strength persistence was calculated from the breaking stress values by the following formula.
Strength persistence (%) = [(fracture stress value after 5 days) / (fracture stress value immediately after treatment)] × 100
The obtained strength sustainability was evaluated according to the following criteria.
Excellent (◎): Strength persistence is 98% or more, Good (◯): Strength persistence is 97% or more and less than 98%, slightly poor (△): Strength persistence is 95% or more and less than 97%, or defective (×) : Strength persistence is less than 95%.

<Feel>
(Moist feeling)
For experimental hair bundles treated with non-washing hair treatments in each case, 5 panelists put their fingers through, 4 points when the moisture feeling is very good, 3 points when good, 2 points when slightly bad, and Scoring was done in 4 stages, with 1 case being bad. The average score was calculated for the scoring results of five panelists, and the average score was evaluated according to the following criteria.
Excellent (◎): Average point is 3.6 points or more, Good (◯): Average point is 2.6 points or more and 3.5 points or less, Slightly poor (△): Average point is 1.6 points or more and 2.5 points Points or less, defective (x): 1.5 points or less.

(Fingering)
For the experimental hair bundles treated with non-washing hair treatments in each case, 5 panelists put their fingers through, 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. The average score was calculated for the scoring results of five panelists, and the average score was evaluated according to the following criteria.
Excellent (◎): Average point is 3.6 points or more, Good (◯): Average point is 2.6 points or more and 3.5 points or less, Slightly poor (△): Average point is 1.6 points or more and 2.5 points Points or less, defective (x): 1.5 points or less.

  As is clear from the results shown in Table 1, since the hair treatments of Examples 1 to 14 that are not washed away contain citrulline that is an active ingredient of the hair strengthening agent of the present invention, the hair strengthening effect and feel are related. All the evaluation results were excellent or good. In particular, since Examples 2 to 14 further contained a nitrogen-containing polymer, any evaluation results relating to the hair strengthening effect and feel were excellent. On the other hand, since the non-washing hair treatment of Comparative Example 1 does not contain citrulline, which is an active ingredient of a hair strengthening agent, each evaluation result of the hair strengthening effect was poor. Comparative Examples 2 to 4 contained various amino acids that are conventionally known hair strengthening components instead of L-citrulline of Example 2, but the durability of the hair strengthening effect was poor. Thus, it can be seen that among amino acids, citrulline exhibits an excellent hair strengthening effect that is not obtained by the prior art, which is excellent in the strength increase rate as well as the hair strength increase rate.

(Example 15, Comparative Example 5)
Next, a hair treatment having the following composition was prepared as Example 15 and applied to each of the same experimental hair bundles as used in Examples 1 to 14, followed by washing for 1 minute, washing and drying. It was. Moreover, the hair treatment of the comparative example 5 which abbreviate | omitted only L-citrulline was prepared from the following composition, and the same process was performed.

(Rinse hair treatment)
L-citrulline 0.05
Stearyl trimethyl ammonium chloride ... 5.0
Cetostearyl alcohol ... 5.0
Isopropyl palmitate 0.5
Olive oil ... 0.5
Amodimethicone ... 3.0
Liquid paraffin ... 1.0
Diglycerin ... 4.0
Octyl methoxycinnamate 0.05
Sodium benzoate 1.2
Fragrance ... 0.2
Purified water: Amount to be 100% in total

  As a result of evaluating the hair bundles treated with the hair treatment washed out in Example 15 and Comparative Example 5 according to the same evaluation criteria as in Examples 1 to 14, the evaluation on the hair strengthening effect when treated with the hair treatment in Example 15 is It was good and the evaluation about the touch was excellent. On the other hand, when treated with the hair treatment of Comparative Example 5, the evaluation regarding the touch was good, but each evaluation regarding the hair strengthening effect was poor.

(Example 16, comparative example 6)
Next, a hair cosmetic composition having the following composition as Example 16 was prepared and used as a hair dyeing pretreatment agent. An appropriate amount of this hair cosmetic was applied to each of the same experimental hair bundles used in Examples 1 to 14, and then immediately dried with a drier. Moreover, the hair cosmetics of the comparative example 6 which abbreviate | omitted only L-citrulline among the following compositions were also prepared, and the same process was performed.

(Hair cosmetics) Mass%
L-citrulline 0.5
Ethanol ... 5.0
Silylated hydrolyzed collagen ... 0.3
Hydroxyethyl cellulose ... 0.5
Glycine ... 0.5
Dipropylene glycol ... 3.0
Methylparaben 1.2
Purified water .... Total amount to 100% After drying, hair dyeing treatment is performed using a commercially available oxidative hair dye (Beauty Lab Hair Color Natural Brown manufactured by Hoyu Co., Ltd.) according to a conventional method. Then, it was washed with a commercially available shampoo (Bigen Treatment Shampoo manufactured by Hoyu Co., Ltd.) and dried.

  The hair bundle that was pre-treated with the hair cosmetic composition of Example 16 and Comparative Example 6 and then processed for hair dyeing was evaluated according to the same evaluation criteria as in Examples 1 to 14. As a result, it was pre-treated with the hair cosmetic composition of Example 16. The evaluation regarding the hair strengthening effect in the case was good, and the evaluation regarding the touch was excellent. On the other hand, when pre-treated with the hair cosmetic composition of Comparative Example 6, the evaluation regarding the touch was good, but each evaluation regarding the hair strengthening effect was poor.

  Furthermore, as a result of visually confirming the dyeing of these hair bundles, the hair bundle pretreated with the hair cosmetic of Comparative Example 6 was clearly shallower than the hair bundle pretreated with the hair cosmetic of Example 16. .

(Example 17, comparative example 7)
Next, as Example 17 and Comparative Example 7, the hair cosmetics used in Example 16 and Comparative Example 6, respectively, were used as hair dyeing post-treatment agents. The same experimental hair bundle as used in Examples 1 to 14 was dyed according to a conventional method using a commercially available oxidation hair dye (Beauty Lab Hair Color Natural Brown manufactured by Hoyu Co., Ltd.), and a commercially available shampoo (Hoyu) After washing with Vigen Treatment Shampoo Co., Ltd., a suitable amount of the hair cosmetic used in Example 16 and Comparative Example 6 was applied in a wet state and immediately dried with a dryer.

  About the hair bundle post-processed with the hair cosmetics of Example 16 and Comparative Example 6, as a result of evaluating with the same evaluation criteria as Examples 1-14, the hair strengthening effect in the case of post-processing with the hair cosmetics of Example 16 The evaluation regarding was good, and the evaluation regarding touch was excellent. On the other hand, when the post-treatment with the hair cosmetic composition of Comparative Example 6 was performed, the evaluation regarding the touch was good, but each evaluation regarding the hair strengthening effect was poor. In addition, the intensity | strength before a process in intensity | strength increase rate evaluation in a present Example is measured before a hair dyeing process.

  Further, these hair bundles were separately immersed in a 1% aqueous solution of sodium lauryl sulfate at 50 ° C. After standing for 10 minutes, the hair bundle was washed with water, dried, and then visually checked for dyeing. As a result, compared with the hair bundle post-treated with the hair cosmetic composition of Example 16, the hair bundle post-treated with the hair cosmetic composition of Comparative Example 6 was clearly faded.

  As shown in the results of Examples 16 and 17, it was found that the hair strengthening agent of the present invention exerts a hair strengthening effect and at the same time exhibits an excellent effect as a hair dyeing pretreatment agent or a posttreatment agent. This is presumed that the dye retention ability of hair increased with hair strengthening.

Next, the technical idea that can be grasped from the above embodiment will be described below.
A pre- and post-treatment agent for hair dyeing, comprising one or more selected from citrulline and salts thereof. When comprised in this way, it can exhibit the effect which improves hair dyeing property as a hair dyeing pretreatment agent as well as the hair strengthening effect, and can exhibit the fading prevention effect as a hair dyeing post-treatment agent.

Claims (4)

A hair strengthening agent comprising one or two or more selected from citrulline and salts thereof as an active ingredient. A hair cosmetic composition comprising the hair strengthening agent according to claim 1. The hair cosmetic composition according to claim 2, comprising a nitrogen-containing polymer. A hair strengthening method by applying the hair cosmetic composition according to claim 2 or 3 to hair.