JP2009221163A - Method for treatment of scalp and hair - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hair treatment composition keeping a homogeneous system in hair treatment and forming a coaservate in rinsing to improve the residual ratio of the active component on the hair. <P>SOLUTION: The method for the treatment of the scalp and hair comprises the application of a hair-treatment composition to the scalp or hair and the rinsing of the scalp or hair with warm water of 25-50°C. The hair treatment composition contains (a) a cationic polymer, (b) an anionic surfactant and (c) a nonionic or ampholytic surfactant, and the temperature to separate the composition to two phases is 25-50°C in the case of diluting 5-10 times with water. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a scalp / hair treatment method, and more particularly to improvement of usability by changing its phase structure.

  Hair treatment compositions represented by hair shampoos, hair rinses, and conditionings generally contain an anionic surfactant, a cationic polymer, an amphoteric or nonionic surfactant, and these three components are used when rinsing the hair. It is also possible to form an insoluble complex (coacervate) and adsorb it to the hair to give a smooth feel (Patent Document 1).

  On the other hand, when hair is treated with the hair treatment composition, the hair is appropriately moistened and the composition stock solution is applied. In this case, it is required that the composition components are spread evenly throughout the hair and that the fingering at that time is good. Therefore, it is preferable to maintain a uniform state in the composition dilution system at the time of treatment, and if a coacervate is formed at the time of treatment, the system becomes non-uniform and unevenness is likely to occur on the hair. Also lacks. However, in the case of a composition that becomes a uniform system at the time of treatment, all of the composition components flow out during rinsing with further dilution, and a smooth feel after shampooing cannot be achieved.

Furthermore, the amount of coacervate adsorbed varies depending on the state of the hair, and there is a great difference in feel between healthy hair and damaged hair even if the hair treatment composition has the same composition. In order to compensate for these drawbacks, the conventional hair treatment composition must be provided by changing the composition according to the state of the hair. However, the condition of the hair changes day by day, and it is not practical to change the hair treatment composition to be used each time.
JP 2006-274016 A

  The present invention has been made in view of the above prior art, and the problem to be solved is hair that can maintain a uniform system during hair treatment and can form a coacervate during rinsing to improve the residual rate of active ingredients in the hair. It is to provide a treatment composition.

In order to achieve the above-mentioned object, the present inventors have conducted intensive research, and as a result, by using a composition in which the formation of coacervate has a temperature dependency, it is possible to obtain a phase state suitable for each of processing and rinsing. The present inventors have found that this can be done and have completed the present invention.
That is, the present invention is a scalp / hair treatment method in which a hair treatment composition is applied to the scalp or hair, and the scalp or hair is rinsed with warm water of 25 to 50 ° C.,
The hair treatment composition comprises (a) a cationic polymer, (b) an anionic surfactant, (c) a nonionic or amphoteric surfactant,
It is characterized in that the separation temperature into two phases is 25 to 50 ° C. when diluted 5 to 10 times with water.
Moreover, in the said method, it is suitable that the two-phase separation temperature of a dilution liquid is 30 to 45 degreeC.

In the above method, the cationic activator is preferably cationized cellulose or polydimethylmethylenepiperidinium chloride represented by the following chemical formula 1.

In the above method, the anionic surfactant is preferably sodium lauryl sulfate or sodium lauryl ether sulfate.
In the above method, the nonionic or amphoteric surfactant is preferably t-octylphenoxypolyethoxyethanol or coconut fatty acid amidopropyl betaine represented by the following chemical formula 2.

Moreover, in the said method, it is suitable that the anion ratio Y defined by following formula 1 is 0.3-0.5.
Y = anionic surfactant / (anionic surfactant + nonionic surfactant + amphoteric surfactant) Formula 1

As described above, according to the present invention, by using the temperature-responsive coacervate, when applying the composition by moistening the hair and performing the treatment, the coacervate is not formed because the temperature is relatively low. Since the hot water is used during rinsing, coacervate is formed and the outflow of the active ingredient is suppressed. Furthermore, even with the same composition, a satisfactory feeling of use can always be provided by changing the rinsing temperature.

The inventors of the present invention focused on adjusting the formation temperature of the coacervate in order to achieve both usability of the scalp / hair treatment composition and the persistence of the active ingredient.
First, the present inventors tried to prepare a hair treatment composition whose phase state changes with temperature. That is, polydimethyldimethylmethylenepiperidinium chloride (cationic polymer) was dissolved in 20 mM t-octylphenoxypolyethoxyethanol (nonionic surfactant) /0.4M sodium chloride solution so as to be 3 g / L. 60 mM sodium lauryl sulfate (anionic surfactant) /0.4 M sodium chloride solution was added dropwise thereto. And the turbidity of the solution was measured and the change of the phase state was investigated. In this case, t-octylphenoxypolyethoxyethanol (nonionic surfactant) forms micelles, and the dropped sodium lauryl sulfate (anionic surfactant) is added to the micelles of t-octylphenoxypolyethoxyethanol. It is captured. Therefore, the dripping of sodium lauryl sulfate adjusts the surface charge of the surfactant micelle.

On the other hand, since polydimethyldimethylmethylenepiperidinium chloride has a cationic property, when the anionicity of the surfactant micelles increases and reaches a certain level, it forms an electrostatic bond with the micelles as shown in FIG. This is considered to cause the two-layer separation.
The results are shown in FIG.
In the figure, the vertical axis represents turbidity, and the horizontal axis Y represents the amount of sodium lauryl sulfate / total amount of surfactant (proportional to the micelle surface charge).
As is clear from the figure, the turbidity suddenly increases around Y = 0.3 to 0.45, and once the turbidity decreases around 0.5, it rapidly rises above 0.55. . It is considered that coacervation is formed in this turbidity increasing region.

Therefore, if the binding state of the anionic surfactant micelle and the cationic polymer is changed depending on the temperature, a temperature-responsive coacervate is formed.
Therefore, the inventors investigated the phase change by changing the temperature in the same test system as in FIG. 3 as shown in FIG.
As a result, it was confirmed that coacervate was not formed at low temperature (5 ° C.) and could be formed at room temperature (22 to 27 ° C. region).
However, considering the use temperature of the shampoo, it is preferable to cause a phase change between normal temperature (25 ° C. or lower) and warm water use (30 ° C. or higher).
Therefore, the present inventors have adjusted the amount of sodium chloride, which is an electrolyte, and examined a region where phase transition occurs depending on temperature.
The basic formulation is shown in Table 1 below, and the evaluation was performed with a 5-fold diluted solution assuming that the hair was actually washed with the treatment composition (Table 2).

As is clear from the results shown in Table 1 above, in this test example, sodium chloride was added to 1.38% to form two phases, that is, an insoluble complex at high temperature (50 ° C.), and hair Rinsing is also facilitated by the decrease in the viscosity of the aqueous phase along with the adsorption to the surface.
On the other hand, one phase is maintained around room temperature, it is easy to apply uniformly to the whole hair, and the feeling of use is excellent.

In the present invention, a surfactant usually used in a hair treatment composition can be blended within a range that does not impair the effects of the present invention.
Specific examples of the anionic surfactant include, for example, alkyl sulfate, alkyl ether sulfate, higher fatty acid salt, alkyl sulfonate, polyoxyethylene alkyl sulfate, alkyl benzene sulfonate, N-acyl sarcosine salt, Examples thereof include N-acyl isethionate, N-acyl glutamate, alpha olefin sulfonate, alkyl ether acetate, polyoxyethylene alkyl ether acetate, and the like.

  Specific examples of the nonionic surfactant include, for example, alkanolamide, glycerin fatty acid ester, polyoxyalkylene alkyl ether, polyoxyalkylene glycol, polyoxyalkylene sorbitan fatty acid ester, sorbitan fatty acid ester, polyoxyalkylene sorbit fatty acid ester. Sorbitol fatty acid ester, polyoxyalkylene glycerin fatty acid ester, polyoxyalkylene fatty acid ester, polyoxyalkylene alkyl phenyl ether, tetrapolyoxyalkylene ethylenediamine condensate, polyoxyalkylene ether, sucrose fatty acid ester, polyoxyalkylene fatty acid amide, Polyoxyalkylene glycol fatty acid ester, polyoxyalkylene castor oil derivative, polyoxy Alkylene hardened castor oil derivatives, alkyl polyglucoside, and the like.

  Specific examples of amphoteric surfactants include alkyl imidazolinium betaines, alkylamidopropyl betaines, alkylaminocarboxylic acids, alkylsulfobetaines, alkylamine oxides, alkylcarboxybetaines, and alkylbetaines.

In addition to the essential components, a silicone emulsion can be added to the hair treatment composition of the present invention. The silicone emulsion in the present invention is an emulsion in which water-insoluble silicone oil droplet particles are present in water as dispersed droplets.
By blending the silicone emulsion, a smooth feeling can be imparted without impairing a heavy velvet-like feel. Moreover, the speed of foam breakage can be further improved.

  The silicone oil in the silicone emulsion is not particularly limited, and specific examples include methylpolysiloxane, methylphenylpolysiloxane, decamethylcyclopentasiloxane and the like. In the present invention, non-volatile silicone oil is preferable, and methylpolysiloxane is particularly preferable. The silicone emulsion can be arbitrarily selected from one or two or more kinds.

  Since the silicone emulsion of the present invention is commercially available as a silicone emulsion, a commercially available product can be used, which is efficient. Examples of commercially available products include, for example, dimethyl silicone emulsion BY22-007 (containing 50% by mass of dimethylpolysiloxane), BY22-009 (containing 20% by mass of ultrafine-particulated methylpolysiloxane), and BY22-029 (highly polymerized methyl). Polysiloxane 50% by mass), BY22-019 (highly polymerized methylpolysiloxane and decamethylcyclopentasiloxane 50% by mass), BY22-034 (highly polymerized methylpolysiloxane and methylpolysiloxane 50% by mass), BY22-020 (containing high-polymerized methylpolysiloxane and light liquid isoparaffin 50% by mass) (above, manufactured by Toray Dow Corning Co., Ltd.).

  Although the compounding quantity of a silicone emulsion is not specifically limited, 0.0005-5 mass% is preferable as a silicone oil amount in the composition whole quantity. More preferably, it is 0.25 to 2.5 mass% in the total amount of the composition.

  In the hair treatment composition of the present invention, in addition to the above-mentioned components, other components that are usually used in hair treatment compositions can be appropriately blended as necessary within a range that does not impair the effects of the present invention. Other ingredients that can be blended include, for example, oils, pearlizing agents, humectants, polyhydric alcohols, polymer-based viscosity modifiers, amino acids (glutamic acid, arginine, etc.), fragrances, pigments, UV absorbers, antioxidants Agents, bactericides, anti-inflammatory agents, antiseptics, sequestering agents, water and the like.

  Specific examples of the oil include, for example, squalane, olive oil, jojoba oil, castor oil, lanolin, liquid paraffin, cetanol, stearyl alcohol and the like. Examples of the pearling agent include ethylene glycol distearate and a styrene polymer.

Specific examples of the humectant include, for example, polyethylene glycol, glycerin, 1,3-butanediol, 1,2-pentanediol, erythritol, sorbitol, xylitol, maltitol, propylene glycol, dipropylene glycol, diglycerin, Examples include sodium pyrrolidone carboxylate, lactic acid, and sodium lactate.

It is explanatory drawing of the preparation process of the processing composition concerning this invention. In this invention, it is explanatory drawing of the mechanism in which a coacervate is formed. It is explanatory drawing of the anionic property of a mixed micelle and a coacervation formation state. It is explanatory drawing of the phase change state of temperature-responsive coacervation.

Claims (6)

Apply the hair treatment composition to the scalp or hair,
A scalp / hair treatment method for rinsing the scalp or hair with warm water of 25-50 ° C.,
The hair treatment composition comprises (a) a cationic polymer, (b) an anionic surfactant, (c) a nonionic or amphoteric surfactant,
A scalp / hair treatment method, wherein the separation temperature into two phases is 25 to 50 ° C. when diluted 5 to 10 times with water.   The scalp / hair treatment method according to claim 1, wherein the two-phase separation temperature of the diluted solution is 30 ° C. to 45 ° C. 3. The scalp / hair treatment method according to claim 1, wherein the cationic active agent is cationized cellulose or polydimethylmethylenepiperidinium chloride represented by the following chemical formula 1.
  4. The scalp / hair treatment method according to any one of claims 1 to 3, wherein the anionic surfactant is sodium lauryl sulfate or sodium lauryl ether sulfate. The method according to any one of claims 1 to 4, wherein the nonionic or amphoteric surfactant is t-octylphenoxypolyethoxyethanol or coconut oil fatty acid amidopropyl betaine represented by the following chemical formula 2: Hair treatment method.
6. The scalp / hair treatment method according to claim 3, wherein the anion ratio Y defined by the following formula 1 is 0.3 to 0.5.
Y = anionic surfactant / (anionic surfactant + nonionic surfactant + amphoteric surfactant) Formula 1