JPH035440B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a cleansing composition containing an N-acylglutamate and a β-alanine type amphoteric surfactant, which aims to be highly safe, gentle on skin and hair, and moreover, An object of the present invention is to provide a cleaning composition having excellent foaming properties and cleaning properties. In recent years, demands on the safety of various cleaning agents have become stronger and stronger, and there is a need for highly safe active ingredients in cleaning agents when formulating formulations. Among these, surfactants obtained using fatty acids and amino acids, which are natural raw materials, have recently attracted attention and demand is increasing. A typical example is N-acylglutamate, which has already been used as a base material for solid detergents, liquid detergents, etc. (Japanese Patent Publication No. 48-11805,
Publication No. 49-34725, etc.), and detergent compositions that do not irritate the skin, which are obtained by adding this to mineral oil-based or alcohol-based detergents, have also been proposed (Japanese Patent Publication No.
-29444). Recently, β-alanine type amphoteric surfactants have attracted attention (Japanese Patent Application Laid-open Nos. 51-68609 and 54-78704).
As a detergent, it exhibits excellent surfactant ability, has excellent emulsifying, dispersing, and solubilizing power, and has excellent dispersing power for metal soap (scum), and is mild and non-irritating to the skin and hair. It has been recognized that it has excellent biodegradability. The above amino acid surfactants are as described above,
When added to synthetic detergents, it has an excellent skin protection effect, but when used alone, it has no emulsifying power for cleaning dirt with a lot of oil stains, such as cleaning dishes with oil on it, and hair with pomade on it. It has been pointed out that the cleaning power is somewhat insufficient. Therefore, the present inventors conducted various studies on detergent compositions comprising a mixture of N-acylglutamate and a β-alanine type amphoteric surfactant, and found that N-acylglutamate and the general formula (A) (However, in the formula, R is a hydrocarbon group having 6 to 18 carbon atoms,
m and n are integers, m=0 to 19, n=1 to 20, m+n
=1 to 20, and M represents hydrogen, an alkali metal such as Na or K, ammonium, or an organic amine. ) When used in combination with an amphoteric surfactant shown in
Compared to when each is used alone, a product can be obtained that has good detergency and foaming power even in the presence of oil stains, has increased skin protection, and has emulsifying and antistatic properties. They discovered that the combing ability after washing was further improved and completed the present invention. The cleaning agent of the present invention can take various forms, such as solid, kneaded, and liquid, depending on the raw materials used, but it has been found that the above-mentioned characteristics are fully exhibited regardless of the form. The acyl group of the N-acylglutamate used here includes fatty acid residues having 8 to 22 carbon atoms, such as acyl of a single fatty acid such as 2-ethylhexanoyl, lauroyl, palmitoyl, stearoyl, and oleoyl, as well as hardened Mixed fatty acid acyls such as beef tallow fatty acid acyl and coconut oil fatty acid acyl are used, and as salts, mono- and di-equivalent salts such as lithium, sodium, potassium, ammonium, alkylolamino, and basic amino acids are used as appropriate depending on the form of the cleaning agent. selected. In the general formula (A) of β-alanine type amphoteric surfactant which is one component, R is a hydrocarbon group having 6 to 18 carbon atoms, such as octyl, decyl, lauryl, myristyl, palmityl, stearyl, isostearyl. Examples include individual alkyl such as or a mixture thereof, where m is an integer of 0 to 19, n is an integer of 1 to 20, and m+n is an integer of 1 to 20, and M is hydrogen or Na, K, etc. Examples include alkali metals, ammonium, and organic amines such as monoethanolamine, diethanolamine, triethanolamine, and lysine. The blending ratio of N-acylglutamate and the β-alanine type amphoteric surfactant represented by the general formula (A) is usually 9:1 to 1:9 by weight, but especially 8:2. An excellent synergistic effect in detergency and foaming power is seen at around 4:6. The cleaning composition of the present invention may include other surfactants, such as anionic surfactants such as other N-acyl amino acid salts, N-acyl proteins, alkyl sulfates, alkyl sulfoacetates, alkyl ether sulfates, Nonionic surfactants such as alkylolamides and amphoteric surfactants such as imidazolines are used as necessary.
It is also possible to incorporate cationic surfactants such as alkylammonium salts, as well as organic or inorganic builders such as citric acid, amino acids, protein acids, sodium sulfate, solubilizers, diluents, fragrances, pigments, etc. can be appropriately blended. A more detailed explanation will be given below using examples. still,
All percentages in the examples are by weight. Example 1 Liquid detergent

[Cleaning power measurement method]

It was carried out according to the improved VS method (Oil Chemistry 24 (9), 595, (1975)). However, the measurement was performed at a sample concentration of 1.5 g/. [Results of Detergent Power Measurement] As is clear from Table 1, a synergistic effect on the detergent power, that is, an increase in the number of dishes washed, was observed in a relatively wide range of blending ratios between the two amino acid surfactants.

[Table] Example 2 Liquid shampoo (%) N-cocoylglutamic acid monotriethanolic acid salt 15 β-alanine type amphoteric surfactant (A) 5 Coconut oil fatty acid diethanolamide 2 Sodium pyroglutamate (50% aqueous solution) 2 Water 76 Total: 100 With the above-mentioned blended composition, a liquid shampoo was obtained that was gentle on the skin and hair, had excellent foaming power and foam retention, and also had an excellent feel after use. In addition, as a result of measuring the foaming quality according to the presence or absence of the β-alanine type amphoteric surfactant (A) in the above composition by the Ross Miles method, as is clear from Table 2, the β-alanine type amphoteric surfactant (A) It was found that foaming was improved by adding .

[Table] Example 3 Solid detergent Monosodium N-acylglutamate *63% N-(2-hydroxyalkyl)-N-(2-hydroxyethyl)-β-alanine** 21% Cetyl alcohol 10% Water 6% Total 100% (* Composition of acyl group is 8:2 composition of semi-hardened beef tallow fatty acid and coconut oil fatty acid) (** 2-hydroxyalkyl group is C ₁₂ ~
C ₁₄ ) In the case of the above formulation, three types of formulations except monosodium N-acylglutamate are mixed, emulsified by heating, and then added to monosodium N-acylglutamate and thoroughly kneaded using a small roll. This was extruded using a small soap prototype device whose mouthpiece was kept at 40 to 50°C, and the resulting bar-shaped detergent was molded using a foot-type molding machine to obtain a solid detergent. This product was gentle on the skin and had a rich foaming and retaining property, and even when used in hard water, no metal soap (scum) was formed and the foaming was good. Example 4 Facial cleansing paste monopotassium N-myristoylglutamate
25% N-(2-hydroxydodecyl)-N-(2-hydroxyethyl)-β-alanine 10% N-(2-hydroxyalkyl)-N-(polyoxyethylene (3 moles)-β-alanine 2% Propylene glycol 10% Polyethylene glycol 1500 5% Water 48% Total 100% A facial cleansing paste that was gentle on the skin and had excellent foaming properties was obtained. Example 5 Transparent facial cleansing paste Detergent monosodium N-cocoylglutamate 25% N-(2-hydroxydodecyl)-N-(polyoxyethylene (3 mol)-β-alanine 25% propylene glycol 5% water 45% The above blended composition was heated at 80°C Dissolve it uniformly while stirring in a vacuum emulsifier kept at room temperature.Then, when it is cooled to room temperature, it produces a facial cleanser that is gentle on the skin and leaves the skin feeling moisturized after use, as well as having a beautiful transparent gel-like appearance. Obtained.

Claims (1)

[Scope of Claims] A cleaning composition characterized by containing 1 N-acylglutamate and a β-alanine type amphoteric surfactant represented by the following general formula (A). (However, in the formula, R is a hydrocarbon group having 6 to 18 carbon atoms,
m and n are integers, m=0 to 19, n=1 to 20, m+n
=1 to 20, and M represents hydrogen, alkali metal, ammonium or organic amine. )