JP4836576B2 - Hair treatment method - Google Patents

Description

  The present invention relates to a hair treatment method for efficiently producing a silicon-containing resin inside hair.

  Conventionally, as a method for improving the physical properties, appearance and feel of hair by infiltrating a substance into the hair, a method using a degradation product such as collagen, keratin or the like similar to the hair component or a derivative thereof has been proposed. However, it is still not a sufficient effect.

  On the other hand, a technique for strengthening hair using alkyltrialkoxysilane on alkali-treated hair is known (see, for example, Patent Document 1). In addition, by applying an organometallic compound obtained by partially or fully hydrolyzing an organometallic compound such as an organosilicon compound and partially or fully condensing it to keratin materials such as nails and hair. A method for protecting and strengthening keratin substances has also been proposed (see, for example, Patent Documents 2 and 3).

  However, in these techniques, since the organometallic compound exists only on the keratin surface, there is a problem that the effect is lost by washing, or the feel of the keratin surface is not the original feel.

  In order to improve such disadvantages, a method for producing a silicon-containing synthetic resin inside hair has been proposed (Patent Document 4). However, the effect of improving hair brought about by performing this treatment once is not always sufficient. Although it is not high, technical improvement is still desired in order to obtain a sufficient effect.

JP 61-7 Special Table 2000-510167 JP 2002-97114 A JP 2005-320314 A

  An object of the present invention is to provide a hair treatment method that can easily produce a large amount of silicon-containing resin in the hair and efficiently impart elasticity and stiffness.

  The inventors have found that the desired object can be achieved by the following operation.

  That is, the present invention is a hair treatment method performed by the following hair treatment agents A and B or hair treatment agents A and C, wherein the step of applying the hair treatment agent A to the hair is performed a plurality of times, and then the hair treatment agent. The present invention provides a hair treatment method for performing the step of applying B or hair treatment agent C.

<Hair treatment agent A>
A hair treatment agent having a pH of 2 to 5, comprising an alkoxysilane represented by the general formula (1), an acid and water.
R ¹ _p Si (OR ² ) _4-p (1)
[Wherein, R ¹ and R ² represent a linear or branched alkyl group having 1 to 6 carbon atoms or a linear or branched alkenyl group having 2 to 6 carbon atoms, and p R ¹ and ( 4-p) R ² may be the same or different. p shows the integer of 0-3. ]

<Hair treatment agent B>
A hair treatment agent which is an acidic aqueous solution having a pH of 1 to 4 after mixing with the hair treatment agent A at a weight ratio of 1: 1.

<Hair treatment agent C>
A hair treatment agent which is an alkaline aqueous solution having a pH of 8 to 12 after mixing with the hair treatment agent A at a weight ratio of 1: 1.

  According to the present invention, a large amount of a silicon-containing resin can be easily produced in the hair, and the firmness and firmness can be efficiently imparted.

  The present invention is a hair that can impart excellent firmness and firmness to hair fibers, particularly hair that does not have firmness and firmness (hair damaged by chemical treatment, etc., thin hair of Westerners and elderly people, etc.) The present invention relates to a treatment agent and a hair treatment method. Here, “giving firmness and elasticity” means improving hair elasticity.

  According to the present invention, the silanol compound produced by hydrolysis of alkoxysilane can be effectively penetrated into the hair and polymerized inside the hair. Therefore, it is possible to achieve an excellent hair modifying effect and improved touch. In addition, the effect persists even after repeated shampooing.

I. Hair treatment agent A
[Alkoxysilane (1)]
In R ¹ and R ² in the general formula (1), examples of the alkyl group include a methyl group, an ethyl group, a propyl group, a butyl group, an isopropyl group, an isobutyl group, and a t-butyl group. , Vinyl group, allyl group and the like. Among these, as R ² , an ethyl group is preferable from the viewpoints of safety of by-products generated by hydrolysis, reactivity of hydrolysis reaction, and the like.

  In the hair treatment agent A, the alkoxysilane (1) becomes a water-soluble silanol compound (2) by hydrolysis and can penetrate into the hair.

R ¹ _p Si (OH) _n (OR ² ) _4-pn (2)

[Wherein R ¹ , R ² and p represent the same meaning as described above, and n represents an integer of 1 or more and (4-p) or less. p R ¹ and (4-p−n) R ² may be the same or different. ]

  From the viewpoint of physical properties of the silanol compound (2) to be produced and penetrability into hair, p in the general formulas (1) and (2) is preferably 0 to 2. Examples of the alkoxysilane (1) include alkyl (C1-6) trimethoxysilane, alkyl (C1-6) triethoxysilane, dialkyl (C1-6) diethoxysilane, and the like.

  The compounding amount of alkoxysilane (1) is in the hair treatment agent A (in the case of the two-component type, in the whole composition including the first agent and the second agent; the same applies hereinafter) from the point of reactivity due to the crosslinking reaction. It is preferably 4% by weight or more, more preferably 12% by weight or more, and 82% by weight or less, further preferably 58% by weight or less. In the case of the two-component system, the content of the alkoxysilane (1) in the first agent is 70 to 100% by weight, more preferably 80 to 100% by weight, and further 90 to 100% by weight from the viewpoint of storage stability. % Is preferred.

〔acid〕
Although not particularly limited, examples of the carboxylic acid include oxalic acid (pKa = 1.04, 3.82), maleic acid (pKa = 1.75, 5.83), aspartic acid (pKa = 1.93, 3.70), salicylic acid (pKa = 2.81). ), Tartaric acid (pKa = 2.82, 3.96), fumaric acid (pKa = 2.85, 4.10), citric acid (pKa = 2.90, 4.34), malic acid (pKa = 3.24, 4.71), succinic acid (pKa = 4.00, 5.24) , Formic acid (pKa = 3.55), lactic acid (pKa = 3.66), glutaric acid (pKa = 4.13, 5.01), adipic acid (pKa = 4.26, 5.03), acetic acid (pKa = 4.56), propionic acid (pKa = 4.67), etc. In view of easy pH adjustment, the first dissociation index (pKa1) is preferably in the range of 1.9 to 5.0, more preferably 2.9 to 5.0, and even more preferably 3.5 to 5.0. Of these, glutaric acid, adipic acid, acetic acid, and propionic acid, which can easily control the polymerization reaction of the silanol compound (2), are preferred, and adipic acid with less odor is more preferred. Other acids are preferably mineral acids such as phosphoric acid, sulfuric acid and hydrochloric acid, and organic acids such as monoalkyl phosphoric acid and paratoluenesulfonic acid.

  The blending amount of the acid is preferably 0.001 to 5% by weight, more preferably 0.001 to 1% by weight in the hair treatment agent A, from the viewpoint of suppressing polymerization before silanol generated by hydrolysis is absorbed into the hair. .

〔water〕
Water is preferably 20 to 95% by weight, more preferably 30 to 86% by weight in the hair treatment agent A of the present invention, from the viewpoint of sufficiently allowing the silanol compound (2) produced by hydrolysis to penetrate into the hair.

[Surfactant]
The hair treatment agent A can further contain a surfactant so that the treatment operation can be performed more simply, reliably and in a short time. By allowing the surfactant to coexist in the hair treatment agent A, hydrolysis of the alkoxysilane can be promoted, and the stirring operation during hydrolysis can be simplified. Furthermore, since the appearance of the system is changed from white turbidity to transparency, the progress of hydrolysis can be easily confirmed, so that the certainty of treatment is also improved. As the surfactant, any of a nonionic surfactant, an anionic surfactant, a cationic surfactant, and an amphoteric surfactant can be used.

  Nonionic surfactants include polyoxyalkylene alkyl ether, polyoxyalkylene alkenyl ether, higher fatty acid sucrose ester, polyglycerin fatty acid ester, higher fatty acid mono- or diethanolamide, polyoxyethylene hydrogenated castor oil, polyoxyethylene sorbitan fatty acid Examples thereof include esters, polyoxyethylene sorbite fatty acid esters, alkyl saccharide surfactants, alkyl amine oxides, and alkyl amido amine oxides. Of these, polyoxyalkylene alkyl ether and polyoxyethylene hydrogenated castor oil are preferable, and polyoxyethylene alkyl ether is more preferable.

  Anionic surfactants include alkyl benzene sulfonates, alkyl or alkenyl ether sulfates, alkyl or alkenyl sulfates, olefin sulfonates, alkane sulfonates, saturated or unsaturated fatty acid salts, alkyl or alkenyl ether carboxylates, Examples include α-sulfo fatty acid salts, N-acyl amino acid type surfactants, phosphate mono- or diester type surfactants, and sulfosuccinate esters. Counter ions of the anionic residue of the surfactant include alkali metal ions such as sodium ion and potassium ion; alkaline earth metal ions such as calcium ion and magnesium ion; ammonium ion; alkanol group having 2 or 3 carbon atoms Alkanolamine having 1 to 3 (for example, monoethanolamine, diethanolamine, triethanolamine, triisopropanolamine, etc.).

  Examples of the cationic surfactant include quaternary ammonium salts represented by the following general formula (3).

[In the formula, R ³ and R ⁴ each independently represent a hydrogen atom, an alkyl group having 1 to 28 carbon atoms or a benzyl group, and simultaneously become a hydrogen atom or a benzyl group; Except when it becomes an alkyl group. An ⁻ represents an anion. ]

Here, one of R ³ and R ⁴ is preferably an alkyl group having 16 to 24 carbon atoms, more preferably 22 alkyl groups, and more preferably a linear alkyl group, and the other is a lower alkyl group having 1 to 3 carbon atoms, Furthermore, a methyl group is preferable. Examples of the anion An ⁻ include halogen ions such as chlorine ion and bromine ion; organic anions such as ethyl sulfate ion and methyl carbonate ion, and halogen ion and further chlorine ion are preferable.

  As the cationic surfactant, mono long chain alkyl quaternary ammonium salts are preferable, and specific examples include cetyltrimethylammonium chloride, stearyltrimethylammonium chloride, aralkyltrimethylammonium chloride, and behenyltrimethylammonium chloride. Stearyl trimethyl ammonium chloride and behenyl trimethyl ammonium chloride are preferred.

  Examples of amphoteric surfactants include imidazoline series, carbobetaine series, amide betaine series, sulfobetaine series, hydroxysulfobetaine series, and amide sulfobetaine series.

  Among these, from the viewpoint of emulsifying ability (miscibility of alkoxysilane (1), organic acid, water and surfactant), nonionic surfactants of HLB 9-15, and further 11-14 are preferred. In addition, the calculated value by the Griffin method is used for HLB here.

  Two or more kinds of surfactants can be used in combination. From the viewpoint of emulsification and hydrolysis at the time of mixing, the content thereof is 0.1 to 20% by weight in the hair treatment agent A, and further 0.5. -15% by weight, more preferably 1-10% by weight.

[PH]
Hair treatment agent A is required to hydrolyze alkoxysilane (1) to produce silanol compound (2), and to allow silanol compound (2) to penetrate into hair and cause a polymerization reaction in hair. It is necessary to delay the polymerization reaction. Therefore, the pH (20 ° C.) of the hair treatment agent A is preferably 2 to 5, and more preferably 3 to 4.

[Other ingredients]
In addition, for the purpose of dissolving the silanol compound (2) and promoting the penetration of the silanol compound into the hair, various monohydric alcohols having 1 to 4 carbon atoms such as methanol and ethanol, glycerin, propylene glycol and the like. Monohydric alcohols, formamide, amides such as N, N-dimethylformamide, N-methylpyrrolidone, sulfoxides such as dimethyl sulfoxide, sulfones such as sulfolane, phosphate esters such as trimethyl phosphate, 2-ethoxyethyl alcohol Water-soluble organic solvents such as alcohol ethoxylates such as polyethylene glycol, tetrahydrofuran, 1,2-diethoxyethane, and ketones such as acetone and methyl ethyl ketone can be used, but the amount is too large When hair treatment agent A is applied to the hair, the hair is sufficient It does not swell, the silanol compound (2) is difficult to sufficiently penetrate. Therefore, the amount of the water-soluble organic solvent used is preferably 35% by weight or less, more preferably 20% by weight or less in the hair treatment agent A. In addition to this, the hair treatment agent A after hydrolysis of the alkoxysilane (1) contains alcohol R ² OH as a by-product.

  The hair treatment agent A has other purposes such as pH adjusters, oils, silicone derivatives, cationic polymers, humectants, viscosity modifiers, fragrances, dyes, UV absorbers, antioxidants, antibacterial agents, preservatives, etc. Depending on the case, it can be blended appropriately.

[Form of hair treatment agent A]
The form of the hair treatment agent A is composed of a first agent containing an alkoxysilane (1) and a second agent containing an organic acid and water and having a pH of 2 to 5 in order to ensure long-term stability. Even if it is prepared by mixing alkoxysilane (1), organic acid and water, surfactant and other optional components immediately before use, and adjusting the pH to 2-5. Good.

  When the hair treatment agent A is a two-component type, the surfactant is preferably contained in the second agent, but can also be contained in the first agent when the first agent does not contain moisture. Moreover, although it is preferable to contain other arbitrary components in the 2nd agent, if it is a non-aqueous liquid component and a solid component, it can also mix | blend in a 1st agent.

  When the hair treatment agent A is prepared by mixing the alkoxysilane (1), the organic acid and water, and the surfactant and other optional components immediately before use, the mixing order is not particularly limited, but by hydrolysis. Since the produced silanol compound (2) starts a polymerization reaction immediately, in order to suppress this, it is preferable to mix the alkoxysilane (1) after mixing the organic acid and water. When a thickener is blended with other components, it is preferable to mix the thickener after hydrolysis because the thickened solution slows the hydrolysis rate of the alkoxysilane (1).

  When the hair treatment agent A is a two-component type, the first agent and the second agent are mixed immediately before use, or when prepared at the time of use, alkoxysilane (1), organic acid and water, and if necessary Accordingly, by mixing the surfactant and other optional components, the alkoxysilane (1) becomes a water-soluble silanol compound (2) by hydrolysis, and can penetrate into the hair. From the viewpoint of the physical properties of the silanol compound (2) and the penetrability into hair, p in the general formula (2) is preferably 0 to 2, n is preferably 2 to 4, and (4-pn) is 0. Is preferred. The molecular weight of the silanol compound (2) is preferably 300 or less, more preferably 90 to 200, from the viewpoint of easy penetration into the hair.

II. Hair treatment agents B and C
The role of the hair treatment agents B and C is to promote the polymerization of the silanol compound by applying it to the hair as a polymerization accelerator after the silanol compound (2) has penetrated into the hair.

  When hair treatment agent B (acidic aqueous solution) is used, the acid preferably has a pKa of less than 4.1, more preferably 3.7 or less, from the viewpoint of the polycondensation reaction rate. In addition, pKa here means a 1st dissociation index | exponent (pKa1) in the case of a diacid or more. Among these, oxalic acid (pKa = 1.04, 3.82), maleic acid (pKa = 1.75, 5.83), aspartic acid (pKa = 1.93, 3.70), salicylic acid (pKa = 2.81), tartaric acid (pKa = 2.82) 3.96), fumaric acid (pKa = 2.85, 4.10), citric acid (pKa = 2.90, 4.34), malic acid (pKa = 3.24, 4.71), succinic acid (pKa = 4.00, 5.24), formic acid (pKa = 3.55), Examples of inorganic acids include lactic acid (pKa = 2.66) and phosphoric acid (pKa = 2.15), hydrochloric acid (pKa = -8), and the like. Of these, malic acid, lactic acid, hydrochloric acid, and phosphoric acid are preferable.

  From the viewpoint of the polycondensation reaction rate, the hair treatment agent B is one having a pH of 1 to 4 when mixed with the hair treatment agent A at a weight ratio of 1: 1, preferably the pH is 1.5 to Use 3.5 or even 2-3. Hair treatment agent B may be a buffer system in the above pH range.

  When hair treatment agent C (alkaline aqueous solution) is used, alkali includes carbonates such as sodium bicarbonate and calcium carbonate; hydroxides such as sodium hydroxide and potassium hydroxide; monoethanolamine, 2-amino-2 Alkanolamines such as -methyl-1-propanol can be used. From the viewpoint of the polycondensation reaction rate, the hair treatment agent C is one having a pH of 8 to 12 when mixed with the hair treatment agent A at a weight ratio of 1: 1, preferably the pH is 8.5 to Use 12 or 9-10.

[Other ingredients]
For hair treatment agents B and C, surfactants, oil agents, silicone derivatives, cationic polymers, humectants, viscosity modifiers, fragrances, pigments, UV absorbers, antioxidants, antibacterial agents, antiseptics, etc., respectively. Depending on the purpose, it can be blended appropriately. Moreover, you may make it an emulsion using an oil agent and surfactant.

[Hair treatment method]
In order to treat hair using the hair treatment agents A and B or the hair treatment agents A and C, first, the hair treatment agent A is applied to the hair. If hair treatment agent A is a two-component type, mix first agent and second agent immediately before use, and if prepared at the time of use, alkoxysilane (1), organic acid and water, and if necessary Surfactant and other optional components are mixed immediately before use, then stirred and mixed by means such as shaking, and after confirming that the mixed solution has become a uniform single phase by visual observation, the obtained mixture is applied to hair. It is preferable to apply. When a surfactant is contained, the stirring operation after mixing can be simplified. When the surfactant is not contained, it is preferable to continuously stir until a uniform one phase is obtained. However, when the surfactant is contained, the first stirring is usually performed, or 1 in several minutes. A single agitation is sufficient. The mixing ratio of the first agent and the second agent (weight ratio of the first agent / second agent) is preferably 80/20 to 1/99, more preferably 60/40 to 20/80. Immediately after mixing, they were incompatible with each other, but by continuing to be shaken and stirred, it became a uniform single phase, so that alkoxysilane (1) was hydrolyzed and silanol compound (2) was produced. I can confirm that. In particular, when a surfactant is included, the silanol immediately after mixing was in a white turbid emulsified state or partially emulsified state, but becomes transparent as it is allowed to stand still or if necessary, and thus silanol. Formation of compound (2) can be easily confirmed.

  If the resulting mixture is allowed to stand, the polymerization reaction of the silanol compound (2) proceeds, so it is preferable to apply the obtained mixture to the hair within 30 minutes, more preferably within 15 minutes. This allows the silanol compound (2) to penetrate into the hair. The hair to be applied may be wet or dry. It is preferable to apply 0.5 to 3 g of the mixture to 1 g of dried hair. The target to be applied may be human hair or hair such as a wig.

  In order to allow the silanol compound (2) to sufficiently penetrate into the hair, the time for application to the hair and blending is preferably 15 to 90 minutes, more preferably 20 to 60 minutes. The silanol compound (2) penetrates into the hair by allowing it to stand for a certain time after application. Under the present circumstances, you may heat the application part of hair to 40-90 degreeC, Preferably it is 40-60 degreeC. After sufficiently impregnating the silanol compound (2) into the hair, it is preferable to dry with warm air to volatilize the moisture, or to remove the excess hair treatment agent A with a towel etc. and then proceed to the next step, It is more preferable to volatilize water with warm air.

  Next, hair treatment agent B or C which is a polymerization accelerator is applied. The time for leaving the silanol compound (2) to proceed for polymerization is preferably 1 to 60 minutes, more preferably about 10 to 30 minutes. At this time, the hair may be wrapped with a wrapping agent or the like in order to prevent the hair from drying, and the application part may be heated to 40 to 90 ° C, preferably 40 to 60 ° C. Thereafter, it may be washed with shampoo or the like and dried appropriately.

Depending on the treatment with the hair treatment agent A and the hair treatment agent B or C, a silicon-containing synthetic resin of about 2% as a silicon element can be generated in the hair (referred to as sorption into the hair). . As the amount of sorption on the hair increases, the effect of improving the hair increases. To repeat the treatment operation to increase the sorption amount, the treatment with the hair treatment agent A and the hair treatment agent B or C and the hair washing are not repeated, but the operation of applying the hair treatment agent A is repeated several times, In addition, by promoting polymerization with the hair treatment agent B or C, a high sorption amount can be obtained efficiently. In this case, it is preferable to sandwich drying with warm air between the application operations of the hair treatment agent A multiple times. By drying with warm air, most of the applied hair treatment agent A is efficiently absorbed into the hair. The number of application operations of the hair treatment agent A is not limited, but is preferably 2 to 5 times from the viewpoint of hair stiffness due to repeated application and drying.

Examples 1-2 and Comparative Examples 1-3
The following hair treatment agent A, hair treatment agent B and shampoo were prepared and used for hair treatment.

<Sample used>
・ Hair treatment agent A
0.23 g of adipic acid was added to 15.22 g of ion-exchanged water and dissolved by stirring. To this, 13.5 g of methyltriethoxysilane was added and stirred for about 30 minutes to obtain a transparent solution. While stirring this solution, a mixture of Labor gum EX [hydroxypropylxanthan gum; Dainippon Pharmaceutical Co., Ltd.] 0.15 g and Emulgen 109P [polyoxyethylene (9) lauryl ether; Kao Corporation] 0.90 g In addition, stirring was continued for 5 minutes to obtain a hair treatment agent A.

・ Hair treatment agent B
A 50% by weight aqueous solution of malic acid was diluted with ion-exchanged water to a concentration of 10% by weight, and sodium hydroxide was added to adjust the pH to 3.0 to obtain a hair treatment agent B.

·shampoo

<Measurement of polysiloxane sorption amount on hair>
An ICP (inductively coupled plasma) emission spectrometer (Horiba, JY238ULTRACE) was used to evaluate the amount of silicon compound sorbed on the hair. The sorption amount of the silicon compound was determined as the sorption amount of silicon element based on the amount of silicon element measured using ashing / alkaline melting / ICP method.

  0.1 g of sample is collected in a platinum crucible, carbonized until no smoke is produced with a heater, and then placed in an electric furnace at 550 ° C. for 2 hours for ashing. After cooling, add 1g of alkaline flux (Na2CO3: H3BO3 = 5: 2) on the remaining ash, perform alkali melting treatment in an electric furnace at 950 ° C for 30 minutes, and after cooling, dissolve in 4mL of 6N hydrochloric acid. The sample solution was made up to 50 mL with pure water. Measurement was performed three times at an absorption wavelength of 251.512 nm and an integration time of 3 seconds, and the amount of silicon element was determined from the average value using a calibration curve. The calculation method of the silicon element sorption amount to the hair is as follows. The results are shown in Table 3.

  Silicon element sorption amount (%) = [silicon element amount (mg) / hair weight (g)] × 0.1

<Measurement of treatment time with human hair>
The treatment time was simulated using a mannequin head with hair up to the shoulder (53 cm outer circumference of the temple). As a result, the time shown in Table 2 was obtained as the estimated time required for each process. Based on this time, the treatment time required in all steps of the following examples and comparative examples was determined. The results are shown in Table 3.

<Each treatment process for tress>
A tress that bundled 0.3g of European human hair with no chemical treatment history was used.

・ Application and absorption of hair treatment agent A 0.6g of hair treatment agent A is applied to the tress and spread with a comb to spread the entire hair bundle, wrapped in a wrap film (Saran Wrap manufactured by Asahi Kasei Life & Living Co., Ltd.) Leave in a 50 ° C hot air bath for 30 minutes.

-Wipe off hair treatment agent A Wipe the tress with Kimwipe (manufactured by Crecia Co., Ltd.) to remove as much as possible the hair treatment agent A remaining around the hair.

・ Dry
Dry with hot air of 50 ℃.

・ Applying and curing hair treatment agent B Apply 0.3g of hair treatment agent B to the tress, spread with a comb over the whole hair bundle, wrap in a wrap film and leave at room temperature for 15 minutes.

・ Hair washing Wet the tress with water, apply 0.5g of the shampoo composition (Table 1) described in the <Use sample> column, whip it well for 20 seconds and spread it throughout the tress, then tap water Rinse for 15 seconds.

Treatment step of Example 1: Example of repeating application and absorption twice For the trace, two steps of “application and absorption of hair treatment agent A” and then “wiping off of hair treatment agent A” were performed once in between After repeating “drying” twice, “application and curing of hair treatment agent B” was performed, “hair washing” was performed three times, and the mixture was left to dry at room temperature.

Example 2 Treatment Step: Example of Repeating Application and Absorption 3 Times The two steps of “application and absorption of hair treatment agent A” and then “wiping off of hair treatment agent A” are performed twice on the trace. After repeating “drying” three times, “application and curing of hair treatment agent B” was performed, and “hair washing” was performed three times and left to dry at room temperature.

Treatment process of Comparative Example 1: Example of one application / absorption. For tress, “application and absorption of hair treatment agent A”, “wiping of hair treatment agent A”, “application and curing of hair treatment agent B”, then Four steps of three “hair washing” were performed once and left to dry at room temperature.

Treatment process of comparative example 2: Example of combination of application and absorption twice Condensation of hair treatment agent A, wiping of hair treatment agent A, hair treatment agent B The four steps of “application and curing” and then three “hair washing” were repeated twice with one “drying” in between, and then allowed to dry at room temperature.

Treatment process of comparative example 3: Example of combination of application and absorption and condensation performed three times For tress, “application and absorption of hair treatment agent A”, “wiping of hair treatment agent A”, “hair treatment agent B The four steps of “application and curing” and then three “hair washing” were repeated three times with two “drying” in between, and then allowed to dry at room temperature.

  From the comparison between Example 1 and Comparative Example 2 and Example 2 and Comparative Example 3, even though the amount of silicon sorption was about the same, the Example was much shorter and more efficient in human treatment time. It is. Naturally, both of these show higher sorption amounts of silicon than one treatment (Comparative Example 1).

Claims (1)

A hair treatment method performed by the following hair treatment agent A and B, the step of applying the hair treatment agent A to the hair subjected several times, and drying in hot air between the plurality of times of coating process The hair processing method which performs the process of performing hair coating agent B after performing this.
<Hair treatment agent A>
A hair treatment agent having a pH of 2 to 5, comprising an alkoxysilane represented by the general formula (1), an acid and water.
R ¹ _p Si (OR ² ) _4-p (1)
[Wherein, R ¹ and R ² represent a linear or branched alkyl group having 1 to 6 carbon atoms or a linear or branched alkenyl group having 2 to 6 carbon atoms, and p R ¹ and ( 4-p) R ² may be the same or different. p shows the integer of 0-3. ]
<Hair treatment agent B>
A hair treatment agent which is an acidic aqueous solution having a pH of 1 to 4 after mixing with the hair treatment agent A at a weight ratio of 1: 1 .