JPH06172137A - Method for modifying keratinous fiber - Google Patents

Abstract

PURPOSE:To obtain a method for modifying keratinous fiber, capable of effectively and durably providing keratinous fiber with tension and rigidity, supplying excellent touch after treatment, changing color tone of hair without dyeing skin. CONSTITUTION:A phosphoric ester-based surfactant such as monoalkyl phosphoric ester or monofluoroalkyl ester is permeated into keratinous fiber to modify the keratinous fiber.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for modifying keratinous fibers, and more specifically, it improves keratinous fibers by effectively imparting firmness and elasticity to the keratinous fibers and changing the color tone of the fibers. It is about quality law.

[0002]

2. Description of the Related Art Conventionally used keratinous fibers, that is, a modification method for imparting elasticity and elasticity to hair, wool, etc., includes, for example, (1) adsorbing a polymer added to a perm agent or the like on the hair surface. Method (JP-A-52-7449, JP-A-58-7)
216113), (2) Method using an astringent (JP-A-55-108812)
No. 58-109405, No. 60-87208), (3) a method of filling a protein hydrolyzate in the hair, and (4) a method of forming an insoluble salt in the hair (JP-A-1-233208). No.) etc. are known. In addition, as a method for modifying the color tone of hair and the like, as a general method, (5) a method of polymerizing an oxidizing dye,
(6) A method of introducing a water-soluble acid dye or the like into the hair, (7)
Known methods include attaching a dye to the hair surface, and (8) attaching an oil compound to the hair surface.

[0003]

However, these methods have some problems. That is, the above (1)
In the methods (3) to (3), the effect was small because the amount of the drug adsorbed on the hair was small, and the effect persisted poorly. In addition, although the method (4) is more effective than the methods (1) to (3), it is still not sufficient, and when the hair is treated by this method, it becomes stiff and feels stiff. It was bad. Therefore, it has been desired to develop a modification method that imparts sufficient firmness and elasticity to keratinous fibers such as hair and is excellent in terms of durability and touch.

On the other hand, when the above methods (5) to (7) are applied to, for example, hair, there is a big drawback that the skin is dyed at the same time, and the method (8) has a sticky feeling. However, it has the drawbacks of poor appearance, unnatural appearance, and a small effect, and there has been a strong demand for a method that changes the color tone of only the hair and is excellent in touch.

[0005]

[Means for Solving the Problems] Thus, in consideration of the actual situation,
As a result of intensive studies to solve the above-mentioned problems, the present inventors have made it possible to effectively and persistently permeate keratinous fibers by allowing a phosphate ester surfactant to sufficiently penetrate into keratinous fibers, It has been found that it is possible to add stiffness and, on the other hand, the color tone of hair can be changed without dyeing the skin,
The present invention has been completed.

That is, the present invention provides a method for modifying keratinous fibers, which comprises permeating a phosphate ester type surfactant into the keratinous fibers.

The phosphoric acid ester surfactant used in the present invention is obtained by a known method, for example, by reacting a long-chain aliphatic alcohol with an oxidizing agent such as phosphoric anhydride or phosphorus oxychloride.

[0008]

[Chemical 1]

[Wherein R ₁ and R ₂ each represent an alkyl group having 6 to 22 carbon atoms or an alkyl group having 6 to 22 carbon atoms having a fluorine atom, and M ₁ and M ₂ each represent a hydrogen ion, a metal ion or Represents an organic cation], or
It is a mixture of (I) and (II).

Particularly, as the phosphoric acid ester type surfactant, those composed of monoalkyl phosphoric acid ester or monofluoroalkyl phosphoric acid ester are preferable. In the case of a phosphate ester surfactant having an alkyl group containing fluorine, the number of fluorine atoms in the alkyl group is not limited.

Such a phosphoric acid ester-based surfactant is usually used in the form of an aqueous solution containing the phosphoric acid ester-based surfactant in an amount of 0.01 to 50% by weight, preferably 1 to 25% by weight, and contains keratinous fibers. The phosphate ester type surfactant is permeated into the fiber by immersing in this aqueous solution or by applying the aqueous solution to the keratinous fiber.

The permeation of the phosphate ester surfactant into the keratinous fiber is 0.6% by weight or more, preferably 1.3 to 10% by weight in the fiber. The permeation amount of the phosphate ester surfactant can be measured by weight change, extraction with a solvent, and analysis of the cut surface with an X-ray microanalyzer or a microspectrophotometer. The feature of the keratinous fiber modifying method of the present invention is that the phosphate ester-based surfactant thus permeates the keratinous fiber, so that the hair or the like is finished supplely and the feeling after treatment is improved. . In the above-mentioned conventional technique, a water-insoluble substance is formed on the surface of or inside the fiber, so that it becomes stiff and squeaky, and the feel after treatment is poor. The term “permeation” as used in the present invention means a state in which a surfactant is present at least inside the fiber, and the form of its presence does not matter. It also includes the case of being filled in fibers.

Further, an aqueous solution containing a phosphate ester type surfactant is applied to the keratinous fibers, or the keratinous fibers are immersed in the aqueous solution, preferably for 3 minutes or more, and particularly preferably for 5 to 40 minutes as it is. The effect of the present invention can be expected more remarkably by washing after standing. Also, 30
It is preferable to heat to -40 ° C because the effect is promoted.

The phosphoric acid ester surfactant used in the present invention preferably has a pH of 5.5 or less. If the pH is higher than this, the electrostatic effect will increase and the penetration into the fiber will decrease and the effect will decrease.

In the modifying method of the present invention, the components other than the above-mentioned essential components which are usually used in hair cosmetics can be appropriately used.

Although the mechanism of the present invention is not completely clear, when a phosphoric acid ester type surfactant penetrates or is filled in the hair, the inside of the hair becomes hydrophobic and, at the same time, the thickness of the hair becomes thick. It is thought that firmness and elasticity are added. In addition, phosphate ester-type surfactants are more effective than other surfactants because phosphate ester-type surfactants have a particularly high affinity with living organisms, so a larger amount penetrates and is washed. It is thought that this is because it is difficult to pull out.

Although the phosphoric acid ester type surfactant itself has no color, the color tone is changed because the permeated phosphoric acid ester type surfactant appropriately scatters light.
It is thought that the color changes depending on the degree of penetration.

Therefore, according to the method of the present invention, firmness on hair,
The effect is even more remarkable for hair that is stiff and has significantly improved hairstyle retention even under high humidity, and especially for hair that has been damaged by chemical treatment and has decreased elasticity, and the hairformability, It has an effect of remarkably improving the holding property. At the same time, it brightens the hair and reduces damage to its appearance.

Further, by appropriately controlling the degree of penetration, there is an effect of changing the hair to a bright color without coloring the skin, clothes, etc., and at the same time, an effect of reducing the appearance and the feeling of damage. .

[0020]

EXAMPLES Next, the present invention will be described with reference to examples.
The invention is not limited by these examples.

Examples 1 and 2 and Comparative Examples 1 and 2 30 treatments at 40 ° C. were applied to the treatment liquids shown in Table 1 for each 10 hairs which were not chemically treated such as permanent wave and hair dye.
It was immersed for a minute, washed with ion-exchanged water, and then dried. The tensile elasticity of these hairs was measured before and after treatment under a relative humidity of 50%. Tensile elasticity was measured at a speed of 1 mm / min using a tensile tester (Model TCM-20, manufactured by Meisho Machine Co., Ltd.).
It was elongated by 0.2 mm and determined from the stress-strain curve according to a conventional method. However, the initial length of hair was 2 cm. The elastic modulus thus obtained was compared by setting the elastic modulus before treatment, which was previously measured by the same method, as 1. The rate of change in elasticity after the treatment is shown in Table 2, and it can be seen that Examples 1 and 2 which are the modification methods of the present invention significantly improve the elasticity. Here, the elastic change rate after the treatment was calculated by the following equation: tensile elastic change rate = (tensile elastic modulus after treatment) / (tensile elastic modulus before treatment). Incidentally,% in Table 1 is% by weight (the same applies hereinafter).

[0022]

[Table 1]

[0023]

[Table 2]

Example 3 and Comparative Examples 3 to 4 A bundle of 10 g of hair not chemically treated with permanent wave, hair dye, etc. was moistened with water, and then dipped in a solution of each formulation shown in Table 3. Rinse thoroughly with ion-exchanged water and dry. Table 4 shows the results of a sensory evaluation of firmness and stiffness of the hair by 10 people. From Table 4,
It can be seen that Example 3 using the method of the present invention imparts excellent firmness and elasticity to the hair in terms of feel.

[0025]

[Table 3]

[0026]

[Table 4]

Examples 4 to 5 and Comparative Example 5 Each of 10 hairs not subjected to chemical treatment such as permanent wave and hair dye was subjected to the treatment shown in Table 5, and then sufficiently washed with water, followed by general treatment. The effect of the present invention on the permed hair was investigated. Each treatment (30 ℃ x
The tensile elastic modulus of the hair after 30 minutes) was determined in the same manner as in Example 1. Table 6 shows the results of comparing the thus obtained elastic moduli with the elastic modulus before treatment preliminarily measured by the same method as 1. From Table 6, it can be seen that Examples 4 and 5 remarkably recover the decrease in elastic modulus due to the permanent wave treatment.

[0028]

[Table 5]

[0029]

[Table 6]

Examples 6 to 7 and Comparative Examples 6 to 7 A bundle of 10 g of hair not chemically treated with permanent wave, hair dye, etc. was moistened with water and then immersed in a solution of each formulation shown in Table 7. It was treated, thoroughly rinsed with ion-exchanged water and dried. Table 8 shows the results of a visual evaluation of the change in color tone of 10 persons on the hair. From the results in Table 8, it can be seen that a change in the color of the hair occurs obviously by the method of the example and the method of the comparative example, and it can be changed by the treatment time.

[0031]

[Table 7]

[0032]

[Table 8]

Table 9 below shows the pH of the compositions of Examples 1 to 7 and the permeation amount of the phosphate ester type surfactant into the hair. The penetration of the phosphate ester-based surfactant into the hair was confirmed by an X-ray microanalyzer, and the penetration amount was determined by the weight change.

[0034]

[Table 9]

Claims (6)

[Claims] 1. A method for modifying keratinous fibers, which comprises infiltrating a keratinous fiber with a phosphate ester surfactant. 2. A method for modifying keratinous fibers, which comprises infiltrating 0.6% by weight or more of a phosphate ester type surfactant into keratinous fibers. 3. A keratinous fiber is dipped in a compound containing a phosphoric acid ester-based surfactant, or the compound is applied to the keratinous fiber, and then left standing for 5 minutes or longer to allow the phosphoric acid ester-based surfactant to be added to the fiber. A method for modifying keratinous fibers, which is characterized in that the keratinous fibers are permeated into the interior. 4. The pH of the phosphate ester surfactant is 5.5.
The keratinous fiber modification method according to any one of claims 1 to 3, which is as follows. 5. The phosphoric acid ester-based surfactant comprises a monoalkyl phosphoric acid ester.
The method for modifying keratinous fibers according to the item. 6. The method for modifying keratinous fibers according to claim 1, wherein the phosphoric acid ester-based surfactant comprises a monofluoroalkyl phosphoric acid ester.