JPS6046156B2 - liquid cleaning agent - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a liquid detergent, and particularly to a liquid detergent that has excellent foaming properties and foam feel, is resistant to precipitation over time, and is less irritating to the skin and hair.

Conventionally, liquid cleaning agents such as shampoos, facial soaps, and kitchen detergents have been made using anionic surfactants such as sodium alkylbenzene sulfonates, higher alcohol sulfates, polyoxyethylene alkyl ether sulfates, and higher fatty acid salts; Those containing a nonionic surfactant such as fatty acid diethanolamide as a main component are used.

In recent years, attempts have been made to incorporate protein hydrolysates, acylated protein hydrolysates, amino acids, etc. into the above-mentioned liquid cleansing agents in order to improve the finish of hair and soften the effect on the skin. . However, these protein derivatives not only have a strong odor, making it difficult to apply them to cosmetics, but also have insufficient effects on mildening the effect on the skin. Grise is a surfactant that causes less skin irritation.

Examples include nonionic surfactants such as phosphorus higher fatty acid ester, polyoxyethylene alkyl phenol, polyoxyethylene alkyl ether, sucrose higher fatty acid ester, and zorbitan higher fatty acid ester, but although these surfactants are hypoallergenic, It does not foam well and does not meet the requirements as a cleaning agent. Recently, acylated amino acids have been attracting attention as surfactants that foam well and are hypoallergenic.

In general, amino acid-based surfactants are said to be broken down by enzymes into long-chain fatty acids and amino acids, so even if they are ingested, they will not accumulate in the body. It is considered to be a suitable surfactant for kitchen detergents and shampoos.

N-acylglutamate is a typical amino acid-based surfactant, but this surfactant has poor lathering in the presence of dirt, and when applied to shampoo, the basic performance of foam texture and creaminess is poor. Because it is inferior,
Various improvements have been attempted so far. For example, JP-A-47-4281 states that a mixture of an N-long chain acyl acidic amino acid salt and a fatty acid dialkanolamide improves foaming even in the presence of dirt. However, according to experiments conducted by the present inventors, the foam-enhancing effect of fatty acid dialkanolamide is significant at pH 7 or above, but no sufficient foam-enhancing effect was observed at pH 5-6, which is mild to hair and skin. . Also, JP-A-50-2280
No. 3 describes that cleaning power is improved by mixing an N-long chain azilic acidic amino acid salt and a fatty acid nonionic surfactant. Furthermore, Japanese Patent Application Publication No. 1973-
Publication No. 1206■ discloses that by mixing N-acylglutamate and an alkyl phosphate or a polyoxyalkyl phosphate, good detergency and foaming power can be exhibited even in the presence of oil stains. Are listed. However, the present inventors conducted various studies regarding these conclusions, and found that the foam performance as Jumpu and the creamy feeling of the foam were still insufficient.
In addition to these amino acid surfactants that are mild to hair and skin, there are N-acyl N-alkyl amino acid salts, but like N-acyl glutamates, they have poor foaming properties in the presence of oil stains. , and the creaminess of the foam is also poor, and although there have been attempts to improve it as shown in Japanese Patent Publication No. 50-33684, as explained above, these improvements have not been sufficient, especially in the creaminess of the foam. Improvements were insufficient.

As explained above, amino acid surfactants have advantages such as high safety and mild effects on the skin and hair, but they also have the advantage of being highly safe and having mild effects on the skin and hair. It has the disadvantage that it does not fully satisfy the basic performance required for products, so it has been difficult to apply it to such products.

An object of the present invention is to provide a liquid detergent that is highly safe, has a mild effect on the skin and hair, has excellent foaming power, and is less likely to cause precipitation over time.

The present inventors have energetically conducted research to improve the foaming performance while taking advantage of the advantages of amino acid surfactants, and as a result, we have found that N-acylamino acid salts and birch bark and/or xylem extracts have been developed. It has been found that the above object can be achieved by mixing the above.

That is, the liquid cleaning agent of the present invention is characterized in that it contains an N-acylamino acid salt and birch bark and/or xylem extract. According to the liquid detergent of the present invention, the foam performance such as foaming and creamy feeling of the foam is significantly improved without impairing the safety and gentle effect on the skin and hair, which are the advantages of amino acid surfactants. Precipitation does not easily occur and has excellent long-term stability.

Hereinafter, the liquid cleaning agent of the present invention will be explained in detail. The acyl group of the N-acylamino acid salt blended into the liquid cleaning agent of the present invention is a lauroyl group, mystoyl group, palmitoyl group, etc., and the amino acid is glutamic acid, glycine, beta-alanine, etc. The salts include sodium, lithium, monoethanolamine, diethanolamine, triethanolamine, and the like.

Note that the N-acyl N-alkyl amino acid salts of the present invention also include N-acyl N-alkylamino acid salts.
- Can be included in acylamino acid salts. in this case,
Alkyl groups include methyl, ethyl, propyl, isopropyl and the like. Preferred N-acylamino acid salts include N-acylamino acids such as N-lauroylglutamic acid, N-myristoylglutamic acid, N-palmitoylglutamic acid, N-myristoyl beta-alanine, N-palmitoyl beta-alanine, and N-lauroyl N-ethylglycine. , N-acyl N-alkyl amino acids such as N-lauroyl N-isopropylglycine, N-lauroyl sarcosine, N-myristoyl sarcosine, N-palmitoyl sarcosine, N-lauroyl N-methyl beta-alanine, sodium, lithium, mono There are ethanolamine, diethanolamine, and triethanolamine salts. The amount of the N-acylamino acid salt to be blended is preferably 3 to 3% by weight, more preferably 5 to 2% by weight, based on the entire detergent composition.

Within this range, particularly remarkable effects are exhibited.
The birch bark and/or xylem extract, which is a component of the liquid cleaning agent of the present invention, is a solution obtained by treating birch bark and/or xylem as follows.

The birch bark and/or xylem is cut into small pieces and air dried.

Add an appropriate amount of water-ethanol mixed solvent to this dried product,
Centrifuge after soaking for ~2 laps. This extract is left standing in a cool, dark place for several days and then filtered. Birch is a deciduous tree having the scientific name Betulaalba in the Betula family.

Birch bark and/or xylem extract contains large amounts of betulin, a lupine triterpene, saponins, and tannins, as well as small amounts of essential oils, bitters, and BetulOsidl.
Contains etc.

In particular, the bark contains more than 10% betulin and up to 15% tannins. The preferred blending amount of birch bark and/or xylem extract is 0.0005 to 30% of the total detergent composition in terms of evaporation residue after 6 hours at 105°C.
．． It is more preferably 0.05 to 10 J weight % than the nominal weight %.

If the amount is less than 0.0005% by weight, the effects of the present invention will not be exhibited, and if it exceeds 30% by weight, the product will tend to precipitate over time.

As mentioned above, improving the foaming performance of amino acid surfactants is a big problem, and it is difficult to improve the foaming properties while taking advantage of their characteristics such as safety and mild effects on the skin and hair. Although it was difficult, such problems were solved by the present invention, and it became possible to apply amino acid surfactants to liquid detergents such as Jumpu.

This improvement in foam properties by the detergent of the present invention is believed to be due to the mixture of the N-acylamino acid salt and birch bark and/or xylem extract into micelles. In addition, when birch bark and/or xylem extract is added, precipitation due to storage is less likely to occur, compared to when saponin is added alone. This indicates that birch components other than saponin effectively contribute to storage stability. The liquid detergent of the present invention may also contain anionic, cationic, nonionic, and amphoteric surfactants as optional components.

Examples of such surfactants include higher alcohol sulfuric esters, alkylbenzene sulfonates, linear alkylbenzene sulfonates, alkylnaphthalene sulfonates, alkyl phosphates, polyoxyethylene sulfates, α-olefin surfactants, and the like. anionic surfactants such as polyoxyethylene alkyl ethers, polyoxyethylene alkylphenol ethers, sorbitan fatty acid esters, polyoxyethylene acyl esters, alkylamine salts, quaternary ammonium salts, etc. There are cationic surfactants and amphoteric surfactants such as alkyl betaines. These surfactants can be used alone or in a suitable combination of two or more. Furthermore, the liquid cleaning agent of the present invention may contain other additive components such as inorganic builders such as sodium tripolyphosphate, sodium metasilicate, and mirabilite, CMCl lower alcohol, antifoaming agents, fluorescent dyes, colorants, fragrances, and the like. It is also possible to do so.

Next, the liquid cleaning agent of the present invention will be explained in more detail based on the following experimental examples. Prior to that, an overview of the test methods and evaluation methods adopted in the experimental examples will be explained. Skin irritation was evaluated using the following two methods (1) and (2).

(1) Sensory evaluation The evaluation was conducted by a manual immersion test by 10 testers using a 1% aqueous solution (35° C.) of the liquid cleaning composition.

That is, the dipping-drying operation was performed 15 times at intervals of 1 minute, and the degree of rough skin on the hands after 2 minutes was visually judged based on the following criteria.
0: Almost no skin roughness Δ: Some dry exfoliation changes in the stratum corneum surface layer of the skin ×: Dry exfoliation changes in more than 30% of the skin (2) BSA molecular ellipticity This is an evaluation using the ellipticity (ellipticity) as an indicator.

The method for measuring the indentation molecular ellipticity is as follows. That is, after mixing 100 ppm of bovine serum albumin and a liquid detergent composition, a sodium phosphate buffer solution was added to give a concentration of 50 Tr1.
Circular dichroism is measured using a trOpOlarimeter to determine molecular ellipticity (0). By the way, the molecular ellipticity of undenatured bovine serum albumin is -11.3×1Cf'D
eg-CltldecimOl. In addition, it has been confirmed that those having a molecular ellipticity equivalent to that of bovine serum albumin and showing no denaturation cause almost no skin irritation. (
The numerical unit in the table is 1 [θ]×10−6. ) 20ml (25°C) of a 6% aqueous solution of foaming liquid detergent composition
00 mt cylinder, add 0.2 y of liquid lanolin as artificial dirt to it, shake it 20 times for 10 seconds, and measure the foam volume (ml) after 1 minute.

Foam feel (sensory evaluation) Divide your hair into two and add 3 to each side.
After lathering the comparison sample and test sample of y, the feel of the lather was evaluated and judged by 10 testers according to the following criteria.

In addition, polyoxyethylene alkyl ether sodium sulfate (average E
Number of moles of O added i=3, alkyl group: C,2/Cl3=1
/1) was used. ++: Foam feel is clearly superior to AES-Na.

+: Slightly better foam feel than AES-Na.

±: The feel is comparable to that of AES-Na. Ni AES-
The feel of the foam is inferior to that of Na.

- The foam feel is very inferior to Ni AES-Na.

Storage stability test sample solution was prepared and incubated at 45°C for 1
The sample was stored for several months, and the presence or absence of precipitate was visually determined.

×: Precipitation 0: No precipitation Test Example 1 Type U liquid cleaning compositions having the compositions shown in Table 1 below were prepared, and their performance was evaluated.

The results are shown in the same table. In addition, the compounding amounts in the table are weight %. As is clear from the table, the cleaning composition containing both N-acyl amino acid salt and birch bark extract (
Examples 1 to 5) all showed excellent performance, whereas
The cleaning compositions (Comparative Examples 1 to 9) that do not contain birch bark extract all have poor performance.

Test Example 2 The storage stability of liquid cleaning compositions shown in Table 2 below was evaluated.

Claims (1)

[Claims] 1. A liquid cleaning agent containing an N-acyl amino acid salt and birch bark and/or xylem extract.