JPH0433839B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a transparent gel-like cleansing composition that has excellent foaming properties and cleansing properties, has mild effects on the skin and eye mucous membranes, and has good storage safety. Conventionally, solid transparent soaps made by adding carbohydrates such as sucrose to alkali metal salts of fatty acids and making them transparent with ethanol, glycerin, etc. have been used as transparent cleaning agents. However, such transparent soaps have poor foaming properties, tend to swell upon water absorption, dissolve, and devitrify during use, and have a high pH, which can easily cause problems such as roughening the skin. Even in this process, the ethanol is gradually volatilized after forming the mold, so
It has drawbacks such as requiring a long time to manufacture. Despite having many of the drawbacks mentioned above, transparent soap has a higher commercial value than ordinary detergents because of its beauty derived from its transparency. In recent years, in order to eliminate the above-mentioned drawbacks while retaining the beauty and luxury of transparent soap, transparent soap has been developed using an amino acid-based surfactant that has a mild effect on the skin and eye mucous membranes and is easy to use. Various efforts are being made to develop gel-like cleaning agents. For example, N-
An example using an acyl acidic amino acid triethanol-amine salt (JP-A-50-75576) or an example using an N-acyl acidic amino acid salt with a neutralization equivalent of 1.5 or more (JP-A-56-76500) etc. is that.
However, while N-acyl acidic amino acid salts have a mild effect on the skin and eye mucous membranes, they are slightly lacking in foaming power in the presence of oil stains, and this tendency is particularly evident with triethanamine salts. This is noticeable when a salt with a neutralization equivalent of 1.5 or more is used. In addition, attempts have also been made to obtain a transparent gel-like detergent made by blending polyethylene glycol, fatty acid diethanolamide, acylated collagen peptide alkali metal salt, etc. with N-acylglutamate, which is a type of N-amyl acidic amino acid salt. However, according to the present inventor's study, the viscosity is low and it cannot form a transparent gel, and furthermore, the odor derived from the alkali metal salt of acylated collagen peptide remains. It was recognized that it is difficult to put it into practical use. On the other hand, imidazoline-based amphoteric surfactants are examples of surfactants that have mild effects on the skin and ocular mucosa, but like N-acyl acidic amino acid salts, these surfactants alone do not react well in the presence of oil stains. In some cases, the foaming power and cleaning power are not necessarily sufficient. The present inventors aimed to improve the foaming performance of transparent gel-like detergents containing N-acyl acidic amino acid salts or imidazoline amphoteric surfactants as main components, using foaming agents such as fatty acid diethanolamide and alkylamine oxides, When we tried to incorporate synthetic surfactants such as alkyl sulfates, which have strong cleaning power, we found that these surfactants were not effective enough when used in small amounts, and that they became transparent when added in large amounts. It was confirmed that safety and safety were lost. In view of these circumstances, the present inventors conducted further studies in order to develop a transparent gel-like cleansing agent that maintains the favorable features of high safety and mild action on the skin and eye mucous membranes, and has improved foaming power and cleansing power. As a result, when the N-acyl acidic amino acid salt and the imidazoline amphoteric surfactant were blended in a specific ratio as described below, the results were good even without the addition of additives such as gelling agents or thickeners. The present inventors have discovered that a transparent gel-like detergent can be obtained that exhibits excellent storage stability, excellent foaming power, and detergent power, and has completed the present invention. That is, the present invention provides a detergent containing (A) an amino acid surfactant represented by the following general formula (), (B) an imidazoline amphoteric surfactant represented by the following general formula (), and (C) water as an essential component. In the composition, the weight ratio of component (B) to component (A) is 8/2 to 1/9.
This is a transparent gel-like cleaning composition in which the surfactant concentration is adjusted to a range of 40 to 70% by weight. (However, R ₁ is an alkyl group or alkenyl group having 7 to 21 carbon atoms, M ₁ and M ₂ are each a hydrogen atom or an alkali metal, and n is an integer of 1 or 2.) (However, R ₂ is an alkyl group or alkenyl group having 7 to 21 carbon atoms, R ₃ is a hydrogen atom, an alkali metal or CH ₂ COOM ₃ , and Z is COOM ₃ , CH ₂ COOM ₃ or

[Formula] M ₃ represents a hydrogen atom, an alkali metal or an alkanolamine. ) According to the present invention, the present invention has the desirable properties of amino acid-based surfactants and imidazoline-based amphoteric surfactants, that is, mild action on the skin and eye mucous membranes, as well as excellent foaming and cleansing properties, and storage stability. A good transparent gel-like cleaning agent can be easily produced. In the present invention, examples of the amino acid surfactant represented by the general formula () include N-lauroyl aspartic acid, N-myristoyl aspartic acid,
N-palmitoyl aspartic acid, N-stearoyl aspartic acid, N-oleoyl aspartic acid, N-isostearoyl aspartic acid, etc. Single fatty acid acylaspartic acid, N-coconut oil fatty acid acylaspartic acid, N-hydrogenated beef tallow fatty acid acylaspartic acid Mixed fatty acids such as acylaspartic acid, N-lauroylglutamic acid, N-myristoylglutamic acid, N-palmitoylglutamic acid, N-stearoylglutamic acid, N-
Single fatty acid acylglutamic acid such as oleoylglutamic acid, N-isostearoylglutamic acid, N-coconut oil fatty acid acylglutamic acid, N-
Examples include mixed fatty acid acylglutamic acids such as hardened beef tallow fatty acid acylglutamic acid, mixtures thereof, and alkali metal salts thereof such as sodium, potassium, and lithium. In addition, the amino acid components are
It may be either an optically active form or a racemic form. Further, as the amphoteric surfactant represented by the general formula (), which is one of the components used in the present invention, for example, a compound represented by the following chemical formula (
-1) to (-7) are preferred. In the transparent gel-like cleaning composition of the present invention, the blending ratio (A)/(B) of (A) amino acid surfactant and (B) imidazoline amphoteric surfactant is 8/2 to 8/2 by weight. 1/
9 The ratio is preferably 6/4 to 4/6; if the amino acid surfactant is more than this ratio, crystallization tends to occur and the low-temperature stability of the resulting transparent gel is impaired, and if it is less, foaming may occur. Power and cleaning power are insufficient. In addition, the total concentration of surfactant, components (A) and (B) is
40-70% by weight, preferably 50-60% by weight,
If the concentration is lower than this, the viscosity decreases and the transition to a fluid liquid is likely to occur, and if the concentration is higher, it not only becomes hard and inconvenient to handle, but also devitrification occurs at low temperatures.
Caking is likely to occur. In order to produce the transparent gel-like cleaning agent of the present invention, an amino acid surfactant, an imidazoline amphoteric surfactant, and water are blended in the above-mentioned proportions.
The solution may be heated and dissolved at ℃ and then allowed to cool. At this time, it is preferable to add an appropriate amount of lower alcohol such as ethanol to facilitate dissolution. When producing the transparent gel-like cleaning agent of the present invention, polyhydric alcohols such as glycerin, ethylene glycol, propylene glycol, sorbitol, urea, thiourea,
Clarifying agents such as maltitol, fragrances, colorants,
Antioxidants such as α-tocopherol, citric acid,
Amino acids, proteins, organic or inorganic builders such as sodium sulfate, etc. can be blended as appropriate. Furthermore, for the purpose of adjusting detergency and foaming, other anionic surfactants, cationic surfactants, and nonionic surfactants may be added within a range that does not impede the purpose of the present invention. These include, for example, fatty acid soap, higher alcohol sulfate ester salt, polyoxyethylene higher alcohol phosphate ester and its salt, polyoxyethylene higher fatty acid phosphate ester and its salt, sulfonated higher fatty acid alcohol ester salt, higher Condensates of higher fatty acids and alkylolamines such as alcohol sulfosuccinate salts, isethionic acid higher fatty acid ester salts, α-sulfo higher alcohol acetate salts, lauric acid diethanolamide, stearic acid monoethanolamide, and their ethylene oxide adducts , N-acyl basic amino acid salts, N-acyl peptides, and the like. Hereinafter, this will be explained in detail using examples. All percentages in the examples are based on weight. Example 1 Facial cleansing composition N-lauroyl-L-glutamic acid monosodium salt 25.0% Imidazoline amphoteric surfactant (-1
Formula) 25.0% Fragrance 0.3% Water 49.7% Total 100.0% Add an appropriate amount of ethanol to the above composition excluding the fragrance, and heat at 80 to 90°C to uniformly dissolve. Thereafter, the ethanol was collected, and when it was cooled to about 60°C, a fragrance was added and left at room temperature to obtain a transparent gel-like facial cleansing composition. Example 2 Facial cleansing composition Monosodium N-coconut oil fatty acyl-L-glutamate 40.0% Imidazoline amphoteric surfactant (-4)
Formula) 10.0% Fragrance 0.3% Glycerin 5.0% Water 44.7% Total 100.0% The above composition was mixed and dissolved in the same manner as in Example 1, and then allowed to cool to obtain a transparent gel-like facial cleansing composition. Example 3 Facial cleansing composition N-myristoyl-L-aspartic acid dipotassium salt 5.0% Imidazoline-based amphoteric surfactant (-6
Formula) 40.0% Fragrance 0.3% Coconut oil fatty acid diethanolamide 5.0% Water 49.7% Total 100.0% The above compounds were mixed in the same manner as in Example 1, dissolved and then released to obtain a transparent gel facial cleansing composition. . Example 4 Facial cleansing composition N-hardened tallow oil fatty acid acyl-L-glutamic acid monosodium salt 5.0% imidazoline amphoteric surfactant (-7
Formula) 35.0% Sodium N-lauroyl sarcosine 5.0% Fragrance 0.3% Glycerin 5.0% Water 49.7% Total 100.0% The above composition was mixed and dissolved in the same manner as in Example 1, and then allowed to cool to form a transparent gel facial cleanser. A composition was obtained. Example 5 Conditioning shampoo composition N-lauroyl-DL-glutamic acid monosodium salt 10.0% N-oleoyl-DL-aspartic acid monosodium salt 10.0% Imidazoline-based amphoteric surfactant (above-3)
Formula) 40.0% Glycerin 5.0% Cationized cellulose 1.0% Fragrance 0.3% Water 33.7% Total 100.0% The above composition was mixed and dissolved in the same manner as in Example 1, and then allowed to cool to form a transparent gel-like conditioner. A shampoo composition was obtained. The cleaning compositions of Examples 1 to 5 were subjected to storage stability, sensory tests, and skin irritation tests based on the following methods. Storage stability test The condition was visually judged after being left in a constant temperature room at 0°C and 40°C for 2 weeks. ◎: Extremely good transparent gel state ○: Good transparent gel state ×: Devitrification, caking, or liquefaction Sensory test A panel of 30 women aged 18 to 30 was tested on the hands and face for face wash and for shampoo. The number of people who had their hair washed and answered that it was good was displayed. Skin irritation test A 24-hour closed patch test with a 10% aqueous solution of each sample was conducted using 10 New Zealand White male rabbits. Judgment was made according to the Draize method below. Draize method A Erythema and eschar formation No erythema 0 Very slight erythema 1 Clear erythema 2 Moderate to severe erythema 3 Severe erythema (dark red) and slight eschar formation
4 B edema formation No edema 0 Very slight edema 1 Mild edema (clear bulge, clear surroundings) 2 Moderate edema (bulge height approximately 1 mm) 3 Severe edema (bulge height 1 mm or more) 4 Judgment Σ (A+B)÷10 ≦2 Mild 〃 ＜5 Moderate 〃 ≧5 Severe

[Table] As is clear from Table 1, the transparent gel-like cleaning agent of the present invention has good storage stability, and has excellent foaming power and good foaming power compared to the known transparent gel-like cleaning agent (comparative example). It has a feeling of use. The ingredients of the comparative example are shown in the table.
Shown in 2.

【table】

[Table] Example 6 N-coconut oil fatty acid acyl-L-glutamic acid monosodium salt (A) Imidazoline amphoteric surfactant (Formula 1 above) (B) 50.0% Fragrance 0.3% Water 49.7% Total 100.0 % In the above composition, the blending ratio of N-coconut oil fatty acid acyl-L-glutamic acid monosodium salt and imidazoline amphoteric surfactant was changed as shown in Table 3, and transparent was prepared in the same manner as in Example 1. A gel-like cleaning agent was prepared and evaluated. From the results in Table 3, N-coconut oil fatty acid acyl-
The weight ratio of monosodium L-glutamate and imidazoline amphoteric surfactant is 8/2~
It will be understood that a ratio of 1/9 provides a transparent gel with good storage stability.

【table】

[Table] Example 7 N-coco fatty acid acyl-L-glutamic acid monosodium salt x% imidazoline amphoteric surfactant (-1
(Formula) -4, a transparent gel-like cleaning agent was prepared and evaluated in the same manner as in Example 1. As shown in Table 4, a transparent gel was formed when the content of N-coco fatty acid acyl-L-glutamic acid sodium salt and imidazoline amphoteric surfactant was 40 to 70% by weight.

【table】

Claims (1)

[Claims] 1. (A) an amino acid surfactant represented by the following general formula (), (B) an imidazoline amphoteric surfactant represented by the following general formula (), and (C) water as essential components. The ratio of component (A) to component (B) in the detergent composition
A transparent gel-like cleaning composition having a weight ratio of (A)/(B) of 8/2 to 1/9 and a surfactant concentration adjusted to a range of 40 to 70% by weight. (However, R ₁ is an alkyl group or alkenyl group having 7 to 21 carbon atoms, M ₁ and M ₂ are each a hydrogen atom or an alkali metal, and n is an integer of 1 or 2.) (However, R ₂ is an alkyl group or alkenyl group having 7 to 21 carbon atoms, R ₃ is a hydrogen atom, an alkali metal or CH ₂ COOM ₃ , Z is COOM ₃ , CH ₂ COOM ₃ or [Formula] M ₃ is a hydrogen atom , indicating an alkali metal or alkanolamine).