JP3494282B2 - 2nd agent for permanent wave for straight perm - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a second agent for permanent waves for straight permanents, and more particularly, to a high viscosity suitable for straight permanents. The present invention relates to a second agent for permanent wave for straight perm, which has excellent storage stability of viscosity and function. 2. Description of the Related Art Wave treatment of hair with a permanent waving agent is carried out by using a reducing agent such as thioglycolic acid or a salt thereof, cysteine or a salt thereof, and a reducing agent such as ammonia, monoethanolamine or triethanolamine. A first agent for permanent wave, which contains an alkaline agent and, if necessary, further contains a wetting agent, a surfactant, a stabilizer, etc., is applied to the hair, and the hair is wound around a rod or the like (or the hair is wound). The first agent is applied to the hair after being wound around a rod), and in that state, the disulfide bond of cystine in keratin, which is a protein (protein) of the hair, is reductively cleaved with the above reducing agent to generate a mercapto group. The above-mentioned first agent is used for the permanent wave second agent mainly containing an oxidizing agent such as sodium bromate and hydrogen peroxide. It is applied to the treated hair by oxidizing the mercapto group with an oxidizing agent in a state where the hair is waved and reforming the disulfide bond at a position different from the original position, thereby fixing the wave. Has been done. [0003] In addition, the permanent wave treatment includes a curly hair straightening treatment for extending wavy hair (curly hair) to a straight state (straight), contrary to the above-described waving treatment. Treatment agents for straight perm used in hair straightening treatment are also included in the category of permanent wave agents. [0004] The mechanism of this straight perm treatment is to apply a first agent to wavy hair, straighten the hair, and in that state reduce disulfide bonds in the hair with a reducing agent to generate a mercapto group. Then, a second agent is applied, and the hair is straightened by oxidizing the mercapto group with an oxidizing agent in a state where the hair is straightened to reform a disulfide group at a position different from the original position. is there. [0005] As described above, in the straight perm treatment, the hair is kept straight in both the first agent treatment and the second agent treatment, so that the first agent and the second agent easily flow down from the hair. Therefore, it is necessary to increase the viscosity of both the first agent and the second agent to prevent them from remaining on the hair and easily flowing down from the hair. [0006] Therefore, in the first agent for permanent wave, the viscosity is increased by blending a water-soluble polymer compound such as carboxymethyl cellulose or xanthan gum. [0007] However, since the second agent contains an oxidizing agent such as sodium bromate, the water-soluble polymer compound such as carboxymethylcellulose cannot be oxidized such as sodium bromate. Is oxidized by the agent and loses its function as a thickener. Therefore, during storage, the viscosity is greatly reduced. As a result, the oxidizing action of the second agent is not sufficiently exhibited, and the function as the second agent is lost. However, there was a problem that was reduced. Accordingly, the present invention solves the above-mentioned problems in the conventional second agent for permanent wave for straight permanent, increases the viscosity of the second agent for permanent wave, and improves the viscosity and function of the second agent. An object of the present invention is to provide a second agent for permanent wave for straight perm, which has excellent storage stability. According to the present invention, a second agent for permanent wave for straight permanent containing an oxidizing agent has a degree of polymerization of 300 to 1,000 (molecular weight 30,30).
Crosslinked sodium polyacrylate having a viscosity of 1,500 to 3,000 cps at 25 ° C. in a 0.5% by weight aqueous solution in which a linear polymer of 2,000 to 100,000) is randomly crosslinked with a crosslinking agent of 200 or more. The above-mentioned problem is solved by increasing the viscosity of the second agent for permanent wave for straight perm and suppressing the decrease in viscosity during storage by containing the same by weight. DETAILED DESCRIPTION OF THE INVENTION The cross-linked sodium polyacrylate used in the present invention has the above-mentioned specific polymerization degree and viscosity, has an excellent thickening effect, and is excellent in the second agent. In addition to not hindering the oxidizing action of the oxidizing agent, it also maintains its thickened viscosity for a long time without being oxidized by oxidizing agents such as sodium bromate and hydrogen peroxide. By including the permanent-wave permanent wave second agent in the permanent-wave permanent agent second agent, the viscosity of the permanent-permanent permanent-wave second agent increases, and the decrease in viscosity during storage is reduced. The cross-linked sodium polyacrylate used in the present invention is, specifically, Rheogic 252L (trade name) manufactured by Nippon Pure Chemical Co., Ltd.
Has a degree of polymerization of 300 to 1,000 (molecular weight of 30,000
To 100,000), which are randomly linked by a crosslinking agent composed of 200 or more tetraallyloxyethanes. For example, the following structural formula (I): Having a structure represented by the following formula, the cross-linking of which is formed by an ether bond, and has a strong resistance to alkalis and neutral salts, a strong resistance to oxidizing agents,
When it is contained in an agent, it is not oxidized by an oxidizing agent. The viscosity of a 0.5% aqueous solution of Rheological 252L (trade name) is 1,500 to 3,000 cps at 25 ° C., which is particularly suitable for thickening the second agent in the present invention. Further, in addition to the above-mentioned tetraallyloxyethane, those crosslinked with civinyl ether, ethylene glycol dimethacrylate or the like may be used. In the present invention, the content of the crosslinked sodium polyacrylate in the second agent for permanent wave (the amount to be added to the second agent for permanent wave) is 1%.
~ 5% by weight. When the content of the cross-linked sodium polyacrylate in the second agent for permanent wave is less than 1% by weight, the effect of increasing the viscosity is not sufficiently exhibited, and the cross-linked sodium polyacrylate for permanent wave is not sufficiently expressed. If the content in the two agents is more than 5% by weight, the viscosity increases too much and handling becomes difficult. The second agent for permanent wave for straight perm of the present invention can be prepared in the same manner as the conventional second agent for permanent wave for straight perm except that the specific crosslinked sodium polyacrylate is contained. it can. As the oxidizing agent, conventionally, for example, sodium bromate, hydrogen peroxide, potassium bromate and the like are used, and the content of these oxidizing agents in the second agent for permanent perm for straight permanent is usually 0.5%. ~ 20% by weight is suitable. The second agent for permanent wave for straight perm of the present invention contains, in addition to the above-mentioned oxidizing agent and crosslinked sodium polyacrylate, an optional component usually used for the second agent for permanent wave for straight perm. Can be. Such optional ingredients include, for example, phosphates, phosphoric acid, sodium hydroxide, etc. added for the purpose of buffering the pH of the preparation, surfactants added as a hair penetration enhancer or a hair protection agent, and feel improvement. Agents, perfumes, preservatives and the like. In the present invention, the viscosity does not decrease even if the above salts are added for the purpose of pH buffering. The second agent for a permanent wave for a straight permanent according to the present invention is usually prepared by adding an oxidizing agent and the above-mentioned specific crosslinked sodium polyacrylate to water or an aqueous medium containing water as a main component. Is prepared by adding and mixing other optional ingredients, and mixing the specific cross-linked sodium polyacrylate with the second agent for permanent wave for permanent perm which is already prepared in a state containing an oxidizing agent. It may be prepared by addition. Next, the present invention will be described more specifically with reference to examples. However, the present invention is not limited to only these examples. In the following examples,% indicating the concentration of the solution or dispersion is% by weight. Example 1 and Comparative Examples 1-2 The second agent for permanent wave for straight perm of Example 1 and Comparative Examples 1-2 was prepared with the composition shown in Table 1. The unit of each component in the table is part by weight, and this is the same in the following tables showing compositions. In addition, the pH of the prepared second agent for permanent wave for straight permanent
And the viscosity are also shown in Table 1. The pH was measured by the pH measurement method (25 ° C.) specified in the Cosmetic Ingredients Standard Test Method, and the viscosity was measured by the second viscosity measurement method (25 ° C., 12 rotations, 1 minute), and the methods for measuring pH and viscosity are the same in the following. [Table 1] When the second agent for permanent wave of Example 1 and Comparative Examples 1 and 2 was used for straight perm, the first agent having the composition shown in Table 2 below was used. In addition, the concentration of a used component that is not pure is shown in parentheses (parentheses) after the name of the component. Table 2 also shows the pH and viscosity of the prepared first agent for permanent wave. [Table 2] Next, the above Example 1 and Comparative Examples 1 and 2
Of the second agent for permanent wave of the viscosity over time with storage, dripping when applied to the hair after the first agent treatment, straight rate, straight retention rate when straight perm treatment is applied to curly hair, treatment The gloss of the hair afterwards and the uniform slip (slip) feeling were examined. The evaluation method and the evaluation result will be described in detail below. (1) Time-dependent change of viscosity by storage: The second agent for permanent wave of Example 1 and Comparative Examples 1-2 was stored at 25 ° C. for 4 months and at 40 ° C. for 4 months, and the time-dependent change of viscosity. Was examined. The results are shown in Table 3 below together with the evaluation results of the following “drip”. However, Table 3
In displaying the evaluation results, the evaluation results are symbolized by the following criteria. ◎: no change in viscosity at all ○: little change in viscosity △: slightly reduced viscosity ×: considerably reduced viscosity (2) Drip: after treatment with first agent The second agent for permanent wave of Example 1 and Comparative Examples 1 and 2 was applied to the straightened hair, respectively, and the state of dripping (that is, the second agent flowing down from the hair) was observed. . The results are shown in Table 3 together with the evaluation results of the change in viscosity over time due to the storage. However, in displaying the evaluation results in Table 3, the evaluation results are represented by symbols according to the following criteria. ◎: no dripping ○: almost no dripping Δ: slight dripping ×: considerable dripping The permanent dripping of the liquid dripping was evaluated in Example 1 and Comparative Examples 1-2. Immediately after the preparation of the second agent and after storage at 25 ° C. for 4 months (shown as “25 ° C. 4 months” in the table, the same applies hereinafter) and after storage at 40 ° C. for 4 months (“40 ° C. 4 months ", the same applies hereinafter). [Table 3] As is clear from the results shown in Table 3, the second agent for permanent wave of Example 1 showed almost no decrease in viscosity and almost no dripping even when stored at 40 ° C. for 4 months. On the other hand, in the second agent for permanent wave of Comparative Example 1 containing carboxymethylcellulose as a thickening agent, the viscosity was greatly reduced when stored at 40 ° C. for 4 months, and dripping occurred. There were many. Comparative Example 2 containing no thickener
Although the viscosity of the second agent for permanent wave did not decrease due to storage, the viscosity was low immediately after preparation and the dripping was large. (3) Straight ratio, straight holding ratio,
Gloss and uniform smoothness First of all, strong hair with a woman's hair (length about 15 cm,
However, weigh 0.5 g of the sample in a natural state without stretching it), bundle one end of the bundle into a hair bundle, wash the hair bundle with a 5% aqueous solution of sodium lauryl sulfate, dry naturally at room temperature, and dry the sample. It was a hair bundle. Next, 1 g of the above-mentioned first agent for permanent wave was applied to the above-mentioned sample hair bundle by 1 g, and combing was performed with a fine comb, and the hair was straightened at 36 ° C. for 15 minutes. After standing, further combing was performed, and after washing with water, 1 g of each of the second agents for permanent wave of Example 1 and Comparative Examples 1 and 2 was applied, and combed with a fine comb.
After standing for 5 minutes, it was washed with water and dried. One end of the hair bundle after the straight perm treatment was fixed to a panel and hung down, the total length was measured, and the straightness was determined by the following equation. [0034] A: Total length (mm) of the hair bundle after treatment B: Total length (mm) of the hair bundle before treatment in a natural state (that is, a hazy state) C: With the hair bundle before treatment straightened Next, the hair bundle after the above straight perm treatment was immersed once a day in a 5% aqueous solution of sodium lauryl sulfate for 5 minutes, washed with water, and dried. After repeating the washing treatment with the aqueous solution of sodium lauryl sulfate for 10 days, the straightness ratio was checked in the same manner as described above, and the straightness ratio immediately after the straight permanent treatment was used to determine the straightness retention ratio according to the following equation. . [0037] The above straight perm treatment and washing treatment were carried out immediately after the preparation of the second agent for permanent wave of Example 1 and Comparative Examples 1 and 2, after storage at 25 ° C. for 4 months, and
Performed after storage at 0 ° C. for 4 months. Table 4 shows the results. Further, sensory evaluation was conducted on the gloss and uniform smoothness of the hair after the straight perm treatment. This was also performed immediately after preparation of the second agent for permanent wave of Example 1 and Comparative Examples 1 and 2, after storage at 25 ° C for 4 months, and after storage at 40 ° C for 4 months. Table 5 shows the results. However, in displaying the evaluation results in Table 5, the evaluation results are represented by symbols according to the following criteria. ◎: Very good ：: Good △: Slightly poor ×: Poor [Table 5] As is clear from the results shown in Tables 4 and 5, Example 1 was particularly superior to Comparative Examples 1 and 2 in that
The straightness and the straightness after storage at 0 ° C. for 4 months were high, and the gloss and uniform smoothness of the hair after the straightening treatment were compared with Comparative Example 1
It was excellent compared to # 2. As described above, according to the present invention, a permanent wave for a permanent permanent wave having a high viscosity suitable for a straight permanent and having excellent storage stability in viscosity and function. Two agents could be provided.

Continuation of the front page (56) References JP-A-5-17322 (JP, A) JP-A-11-113038 (JP, A) JP-A-11-130637 (JP, A) (58) Fields studied (Int .Cl. ⁷ , DB name) A61K 7/09

Claims (1)

(57) [Claim 1] In a second agent for a permanent wave for a straight permanent containing an oxidizing agent, the degree of polymerization is 300.
~ 1,000 (Molecular weight 30,000-100,000)
Of more than 200 linear polymers randomly by crosslinking agent
The combined 0.5% by weight aqueous solution has a viscosity of 1,50 at 25 ° C.
A second agent for a permanent wave for a straight perm, comprising 1 to 5% by weight of a crosslinked sodium polyacrylate of 0 to 3,000 cps.