JPH0327526B2 - - Google Patents

Description

[Detailed description of the invention]

INDUSTRIAL APPLICATION FIELD The present invention relates to a hair cleaning composition such as shampoo, more specifically, a hair cleaning composition containing menthol and a certain type of anionic surfactant having ammonia or alkanolamine as a counter ion. This invention relates to a hair cleansing composition that prevents coloring that occurs over time. Conventional technology Formula using ammonia or alkanolamine as a counter ion: R ₁ -O-(CH ₂ CH ₂ O)n-SO ₃ -M [] [In the formula, R ₁ is alkyl or alkenyl having 8 to 20 carbon atoms] ; n is 0 to 5; M means a cation derived from NH ₄ or an alkanolamine, such as triethanolamine] It is well known that anionic surfactants of the following form become colored over time, In hair cleaning compositions such as shampoos that use this surfactant, metal sequestrants, urea, reducing agents, antioxidants, ultraviolet absorbers, and the like are added to prevent this coloring. however. This coloration is promoted by fragrances, especially menthol, contained in the hair washing composition, and cannot be prevented by conventional methods. It is difficult to prevent the product value from decreasing due to the accompanying decrease in aroma and clean feeling. On the other hand, an anionic surfactant of formula [] and formula: [In the formula, _R2 means an alkyl or alkenyl having 8 to 20 carbon atoms] It has been demonstrated that a hair washing composition containing an alkanolamide represented by the following formula in combination with menthol exhibits excellent cooling sensation and hair washing performance. However, even in this composition, coloring occurs over time due to the surfactant of formula [] and menthol, and it is very difficult to prevent this. Problems to be Solved by the Invention The present inventor has proposed an anionic surfactant of the formula [],
Intensive research has been carried out to prevent coloring over time in a hair cleansing composition containing alkanolamide and menthol of formula []. As a result, it was found that discoloration over time can be effectively prevented by coexisting with a certain type of diphosphonic acid. Means for Solving the Problems The present invention provides: (a) 1 to 20% by weight of an anionic surfactant of the formula [], (b) 0.1 to 10% by weight of an alkanolamide of the formula [], (c) l- or dl-menthol 0.01-5% by weight and (d) formula: [In the formula, M ₁ , M ₂ , M ₃ and M ₄ each independently represent hydrogen or an alkali metal such as sodium or potassium]. The present invention provides a hair cleansing composition. As mentioned above, in order to prevent discoloration of hair cleansing compositions over time, metal sequestrants such as EDTA have been conventionally used.On the other hand, compounds of formula [] also have a metal sequestration effect, but compounds of formula [] Conventional sequestering agents have little effect on preventing coloration over time of hair cleaning compositions containing an anionic surfactant of formula [], an alkanolamide of formula [], and menthol, and a compound of formula [] It has a specific coloration prevention effect. Thus, in the hair cleansing composition of the present invention, by incorporating the diphosphonic acid of formula [], coloring over time and the resulting decrease in commercial value are specifically prevented. Typical anionic surfactants of formula [] include lauryl sulfate triethanolamine,
Examples include polyoxyethylene (3) lauryl ether sulfate triethanolamine, ammonium lauryl sulfate, and the like. These are based on the characteristics of the individual active agents actually used, the desired performance, and from an economic point of view.
Generally, it is included in an amount of 1 to 20% by weight based on the total amount of the composition. Representative alkanolamides of formula [] include coconut oil fatty acid diethanolamide, which is also generally incorporated in an amount of 0.1 to 10% by weight based on the total amount of the composition from the viewpoint of desired performance and economy. L- or dl-menthol may be used alone or as a component of a fragrance, and from the viewpoint of cooling sensation, solubility, and economy, the amount of l- or dl-menthol may be 0.01% based on the total amount of the composition.
-5% by weight, preferably 0.1-5% by weight. Typical diphosphonic acids of the formula [] include Killesculin HEP (manufactured by Killest Chemical Co., Ltd.), Terpinal SL, and Terpinal 4NL (manufactured by Hoechst Hakusuisha), and from the viewpoint of desired performance and economy, the composition is generally It is blended in an amount of 0.001 to 1% by weight, preferably 0.01 to 0.5% by weight, based on the total amount of the substance. The hair cleansing composition of the present invention can be made into a shampoo by a conventional method such as mixing and dissolving each component, and if desired, may further contain other fragrances, colorants, preservatives, conditioning agents, etc. The combination is very good. As mentioned above, the addition of a sequestering agent, which is normally used as a discoloration inhibitor for shampoo, is not very effective in the present invention and may even promote discoloration, so it is preferable to avoid it. . EXAMPLES Next, the present invention will be described in more detail with reference to Examples and Comparative Examples. Example 1 According to the following formulation, using various color inhibitors,
A shampoo was prepared by a conventional method, left at 50° C. for one month, and visually compared with a control sample containing no coloring inhibitor to evaluate the coloring prevention effect. The results are shown in Table 1. Ingredient weight% Lauryl sulfate triethanolamine 15.0 Coconut oil fatty acid diethanolamide 5.0 l-Menthol 2.0 Fragrance (does not contain menthol) 0.5 Anti-coloring agent shown in Table 1 Purified water Balance shown in Table 1 The anti-coloring effect is , evaluated based on the following criteria. 1: Significant coloring prevention effect is observed. 2: Coloring prevention effect is observed. 3: Coloring to the same extent as the control sample is observed. 4: Promotion of coloring is observed.

【table】

[Table] As shown in Table 1, among various coloring inhibitors, diphosphonic acid of formula [] specifically exhibits a coloring preventing effect. Examples 2 to 7 and Comparative Examples 1 to 4 Various shampoos were prepared by conventional methods according to the formulations shown in Table 2. Samples of each shampoo were heated to 50°C.
After being left for 3 months or exposed to sunlight for 2 months, the degree of coloration was compared with a sample maintained at 0° C. and evaluated according to the following criteria. ○: Coloring is significantly prevented. Δ: Coloring is prevented. ×: Coloring prevention effect is not observed. In addition, the odor and refreshing feeling after leaving or exposure,
The overall evaluation was evaluated based on the following criteria. ○: Very good. △: Good. ×: Defective. The results are shown in Table 2.

[Table] As is clear from Table 2, the addition of diphosphonic acid of formula [] can prevent specific coloring.
Decrease in product value can be effectively prevented.

Claims (1)

[Claims] 1 (a) Formula: R ₁ -O-(CH ₂ CH ₂ O)n-SO ₃ ·M [] [In the formula, R ₁ is alkyl or alkenyl having 8 to 20 carbon atoms; n is 0 to 5; M means a cation derived from NH ₄ or an alkanolamine] 1 to 20% by weight of an anionic surfactant represented by the formula (b) [In the formula, _R2 means alkyl or alkenyl having 8 to 20 carbon atoms] 0.1 to 10% by weight of an alkanolamide represented by (c) 0.01 to 5% by weight of l- or dl-menthol, and (D) formula: [In the formula, M ₁ , M ₂ , M ₃ and M ₄ each independently represent hydrogen or an alkali metal.] Composition for hair cleaning.