JP2001220322A - Hair luster-improving agent - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a hair luster-improving agent capable of improving the luster of the hair markedly, and capable of obtaining effects e.g. dyeing the hair color after coloring the hair as a fresh color and improving its luster. SOLUTION: This hair appearance-improving agent is a hair luster-improving agent, light scattering-inhibiting agent and irregular reflection-inhibiting agent containing components of an oxy acid, an amino acid, a peptide, a polycarboxylic acid, an aromatic carboxylic acid, urea, guanidine, a primary amine, an alcohol, a dialkylketone, an alkylene carbonate, an alkylene glycol, a polyalkylene glycol, etc., which increase the hair weight by 2-30 wt.% at before and after the treatment of the hair, as active ingredients.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to optical properties of hair,
That is, the present invention relates to a hair care agent that suppresses light scattering and irregular reflection of hair and significantly improves transparency.

[0002]

2. Description of the Related Art Conventionally, various hair cosmetics have been used to improve optical properties such as gloss of hair. However, these hair cosmetics are intended to act on a cuticle (hair cuticle) on or near the surface of the hair, and the effect is temporary or insufficient. .

[0003] There is a problem that the hair after the hair dyeing treatment or the permanent wave treatment is particularly denatured, so that the hair itself becomes dull and the transparency is reduced.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a hair care agent capable of improving the optical properties, particularly transparency, of hair.

[0005]

The present inventors have conducted various studies on the relationship between the transparency, light scattering property and irregular reflection property of hair and hair treatment components. It has been found that the use of a hair care agent containing a component that increases the weight of the hair to a certain range later suppresses light scattering and irregular reflection of the hair after the treatment and significantly improves transparency.

That is, the present invention provides a hair transparency improving agent, a hair light scattering inhibitor, and a hair irregular reflection inhibitor (hereinafter, referred to as a hair colorant) containing, as an active ingredient, a component that increases hair weight by 2 to 30% by weight before and after hair treatment. "Transparency improver, etc.").

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The change in hair weight before and after hair treatment of the present invention can be measured by comparing the hair weight in a standard dry state before treatment with the hair weight in a standard dry state after treatment. Here, the standard dry state is
It refers to a state in which hair is hung and dried for 24 hours at a temperature of 20 ° C. and a humidity of 60% RH without wind. In addition, hair treatment
After treating the hair fiber bundle at a bath temperature (hair / treatment agent weight ratio) of 1/10, the bath temperature (hair / ion-exchanged water weight ratio) of 1/100 to 1 hour at a bath temperature (hair / treatment agent weight ratio) of the treatment agent at 40 ° C for 1 hour. 1/100
The sample is immersed in water at 0 for 30 seconds, and after lifting, wiping off excess moisture with a dry towel. Thereafter, the hair is put in the standard dry state and the hair weight is measured.

[0008] The rate of increase in the hair weight before and after the hair treatment thus obtained is 2 to 30% by weight (hereinafter simply indicated as%), and particularly preferably 5 to 20%.

[0009] When hair is treated with a hair care agent containing a component showing such an increase rate of hair weight, as described above,
Light scattering and irregular reflection of the hair are suppressed, and the transparency of the hair is significantly improved. The light scattering suppressing effect, the irregular reflection suppressing effect and the transparency improving effect were measured by measuring the lightness of the hair before and after the hair treatment under the above-mentioned conditions, and the lightness reduction rate was 0.02.
It can be determined based on whether or not the above is true. Here, the measurement of brightness is
Gonio Photometer (Murakami Color Research Laboratory, GCM
S-3 type), and diagonally 45 from above the root of the hair fiber bundle
White light is incident on the hair at an angle of
The lightness (L value) is measured when light is measured from a direction perpendicular to the hair (light receiving angle 0 ° direction) in the same plane as the hair fiber and in the half plane on the same side as the incident light with respect to the hair (FIG. 1). ).
The lightness before the processing is L ⁰ and the lightness after the processing is L ⁰ ′, and the lightness reduction rate is obtained by the following equation.

[0010]

(Equation 1)

The information contained in the L ⁰ -L ⁰ ′ values includes, in addition to the color, inhomogeneity caused by damage to the hair structure such as the cuticle surface, cuticle layer, cortex, medura, and light scattering from the cavity. Including diffuse reflection. In order to measure such light scattering and irregular reflection, a method of measuring lightness from the direction of a light receiving angle of 0 ° under the above-mentioned goniophotometer measurement conditions is suitable. The advantage of this method is that the effect of hair color can be suppressed as much as possible, and the effects of scattering and diffuse reflection from the surface and inside of the hair can be more sensitively reflected.

The rate of increase in hair weight before and after the hair treatment is 2
As a component to be set to 30%, for example, a compound having an amino group, a hydroxyl group, a carbonyl group, or a carboxyl group in the molecule and having a molecular weight of 30 to 500 is exemplified. Such a compound may further have other groups such as a mercapto group and a guanidino group. Further, the molecular weight of the compound is preferably from 30 to 500.

Examples of such compounds include α-hydroxy acids, β-hydroxy acids, 1,2-dicarboxylic acids, 1,3-dicarboxylic acids, aromatic carboxylic acids, amino acids, peptides, N-acyl amino acids, urea , Urea derivatives, guanidine, guanidine derivatives, primary amines, alcohols, aromatic alcohols, dialkyl ketones, alkylene carbonates, alkylene glycols, polyalkylene glycols and derivatives thereof, especially α-hydroxy acids, β- Hydroxy acids, 1,2-dicarboxylic acids, 1,3-dicarboxylic acids, aromatic carboxylic acids, amino acids, ureas, guanidines, aromatic alcohols, dialkyl ketones, alkylene carbonates, alkylene glycols, polyalkylene glycols and derivatives thereof preferable.

Specifically, for example, malic acid, succinic acid,
Maleic acid, salicylic acid, malonic acid, mandelic acid, lactic acid, glycolic acid, glycine, urea, phenylurea, citrulline, thiourea, guanidine, phenylguanidine, benzylguanidine, 3-methoxy-2-hydroxypropylguanidine, 2- (2 -Hydroxyethoxy) ethylguanidine, monoethanolamine, ethanol, n-propanol, benzyl alcohol, benzyloxyethanol, methyl salicylate, ethylene glycol salicylate, diethyl ketone, propylencarbonate, dipropylene glycol, propyl propylene glycol, ethyl carbitol, N -Methyl-2-pyrrolidone and the like.

One or more such compounds can be used, and when contained in a hair care agent, 0.1 to 50%, preferably 0.5 to 30%, more preferably 1 to 20% in the total composition. %
It is preferable to include them because the effect can be obtained under milder processing conditions.

When the transparency improver of the present invention is contained in a hair care agent, in addition to the above compounds, components usually used in hair cosmetics, such as cationic surfactants, anionic surfactants, and nonionic surfactants Surfactants, zwitterionic surfactants, higher alcohols, acid dyes, oxidation dyes, silicones, cationic polymers, reducing agents, oxidizing agents, solvents, etc., as long as the effects of the present invention are not impaired. Can be done.

The hair care agent containing the transparency improving agent of the present invention can be produced by mixing the respective components, and the form is not particularly limited. For example, it is in the form of a liquid, gel, cream, aerosol or the like. be able to.

The hair care agent containing the transparency improving agent of the present invention has a pH of 2 to 12, especially 2 to 6, or 8
It is preferably from 10 to 10. In order to obtain a preferable pH, the pH may be adjusted by adding an acid or an alkali.

[0019]

EXAMPLES Examples 1 to 14 Hair care agents containing transparency improvers and the like shown in Tables 1 to 3 were prepared, and the lightness reduction rate was measured to improve the hair transparency, suppress light scattering, and suppress irregular reflection. The effect was evaluated. The processing conditions and evaluation results are also shown in the table. Hair is permed (2
Times) and bleached (twice) length 20 cm, 10
g of hair tress was used. In addition, perm treatment is performed with one agent (ammonium thioglycolate 8%, water balance, pH 9.0).
(Adjusted with strong ammonia water)] at 30 ° C for 15 minutes,
Next, two agents [sodium bromate 7%, water balance, pH
9.0 (adjusted with strong ammonia water)] at 30 ° C for 10 minutes. The bleaching treatment was performed at 30 ° C. for 20 minutes with a bleaching agent [8.5% hydrogen peroxide, water balance, pH 9.5 (adjusted with strong ammonia water)]. The bath ratio (hair / agent) was set to 1/1 for both the permanent agent and the bleaching agent. As can be seen from the table, it can be seen that the examples all have a lightness reduction rate of 0.02 or more and have a hair transparency improving effect, a light scattering suppressing effect, and an irregular reflection suppressing effect.

[0020]

[Table 1]

[0021]

[Table 2]

[0022]

[Table 3]

Example 15 A shampoo / rinse containing a transparency improver and the like shown in Table 4 was prepared, and the shampoo / rinse treatment was repeated 30 times.
By measuring the lightness reduction rate, the effect of improving hair transparency,
The light scattering suppressing effect and the irregular reflection suppressing effect were evaluated. The evaluation was performed in the same manner as in Examples 1 to 14. Table 5 shows the evaluation results.
As can be seen from Table 5, in the example, the lightness reduction rate was 0.02.
As described above, it can be seen that it has the effect of improving hair transparency, the effect of suppressing light scattering, and the effect of suppressing irregular reflection.

[0024]

[Table 4]

[0025]

[Table 5]

Example 16 A hair dye containing a transparency improver and the like shown in Table 6 was prepared, and the lightness reduction rate was measured to improve the hair transparency after treatment, suppress light scattering, and suppress irregular reflection. Was evaluated. The evaluation was performed in the same manner as in Examples 1 to 14. Table 7 shows the evaluation results. As can be seen from Table 7, the Example has a lightness reduction rate of 0.02 or more, and has an effect of improving hair transparency, an effect of suppressing light scattering, and an effect of suppressing irregular reflection.

[0027]

[Table 6]

[0028]

[Table 7]

Example 17 A permanent agent containing a transparency improving agent and the like shown in Table 8 was prepared, treated with one permanent agent, treated with two permanent agents, and measured for the lightness reduction rate, thereby improving the hair transparency. The light scattering suppressing effect and the irregular reflection suppressing effect were evaluated. Evaluation was performed in Examples 1 to 14.
The same was done. Table 9 shows the evaluation results. As can be seen from Table 9, the example has a brightness reduction rate of 0.02 or more,
It can be seen that it has a hair transparency improving effect, a light scattering suppressing effect, and an irregular reflection suppressing effect.

[0030]

[Table 8]

[0031]

[Table 9]

[0032]

EFFECTS OF THE INVENTION The use of the hair transparency improver of the present invention significantly improves the transparency of hair, such as improving the color of hair after coloring to a vivid color and improving gloss. The effect is obtained.

[Brief description of the drawings]

FIG. 1 is a diagram showing a method for measuring the lightness of hair.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Takao Shinozaki 2-1-3 Bunka, Sumida-ku, Tokyo Inside Kao Corporation Research Laboratory (72) Inventor Hiroshi Ikeda 2-1-3 Bunka, Sumida-ku, Tokyo Kao 4C083 AB032 AB312 AB332 AC072 AC102 AC122 AC152 AC232 AC292 AC302 AC482 AC542 AC582 AC682 AC692 AC792 AC842 AC852 AD042 AD282 BB53 CC31 DD21 DD23 DD25 DD31 DD41 EE21

Claims (3)

[Claims] 1. A hair transparency improver comprising, as an active ingredient, an ingredient which increases hair weight by 2 to 30% by weight before and after hair treatment. 2. A hair light scattering inhibitor comprising, as an active ingredient, a component which increases hair weight by 2 to 30% by weight before and after hair treatment. 3. An agent for suppressing irregular reflection of hair, comprising, as an active ingredient, a component which increases the weight of hair by 2 to 30% by weight before and after hair treatment.