JPS59179597A - Liquid detergent - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

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, 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; and those containing nonionic surfactants such as fatty acid noethanolamide as a main component are used.

In recent years, attempts have been made to incorporate tongue and spear hydrolysates, acylated protein hydrolysates, amino acids, etc. into the above-mentioned liquid detergents in order to improve the finish of hair and soften the effect on the skin. ing. However, these protein derivatives have a strong odor, making them difficult to apply in cosmetics, and they are insufficiently effective in softening the effect of applying them to the skin.

Examples of surfactants that are less irritating to the skin include nonionic surfactants such as glycerin higher fatty acid esters, polyoxyethylene alkylphenols, holoxyethylene alkyl ethers, sucrose higher fatty acid m esters, and sorbitan higher fatty acid esters. Although these surfactants are hypoallergenic, they do not foam well and do not satisfy the requirements for cleaning agents.

Recently, acylated amino acids have been attracting attention as surfactants that foam well and are hypoallergenic.

In general, amino acid-based surfactants are broken down by enzymes into long-chain fatty acids and amino acids, so it is said that they will not accumulate in the body even if they are ingested. It is considered to be a surfactant suitable for shampoos 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 shampoos, it lacks the basic foam feel and creamy feel. Because of its inferiority, various improvements have been attempted. For example, JP-A-4. ．． Publication No. 7-42809 states,
There is a description 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. borrowed. Further, JP-A-50-22803 describes that the detergency is improved by mixing an N-long chain acyl acidic amino acid salt and a fatty acid nonionic surfactant. Furthermore, in Japanese Patent Application Laid-Open No. 54-120610, N
It is described that good detergency and foaming power can be exhibited even in the presence of oil stains by mixing an acyl glutamate with an alkyl phosphate or a polyoxyalkyl phosphate. However, the inventors conducted various studies regarding these conclusions and found that the foaming performance and creamy feeling of the foam as a shampoo 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 been sufficient, especially in improving the creaminess of the foam. Improvements were insufficient.

As explained above, amino acid-based surfactants have the advantages of high safety and gentle action on the skin and hair, but they also have the advantages of foaming and creamy foam. It has the disadvantage that it does not fully satisfy the basic performance required for facial cleansing soaps, and therefore, 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, and has excellent foaming power.

The present inventors have energetically conducted research to improve foaming performance while taking advantage of the advantages of amino acid surfactants, and as a result, the above objective has been achieved by mixing N-acylamino acid salts and saponin. I found out what can be done. That is, the characteristic of the liquid detergent of the present invention is that it contains N-acylamino 11 salt and saponin.

According to the liquid detergent of the present invention, foam performance such as foaming and creamy feel 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.

The liquid cleaning agent of the present invention will be explained in detail below.

The acyl group of the N-acylamino acid salt blended into the liquid detergent of the present invention is a lauroyl group, mylinutoyl group, or lumitoyl group, and the amino acid is glutamic acid, glycine, beta-alanine, etc. -Acylamino salts include sodium, lithium, monoethanolamine, jetanolamine, triethanolamine, etc. Note that N-ano and N-alkyl amino acid salts can also be included in the N-acyl amino acid salts of the present invention. In this case, the alkyl group is a methyl group, an ethyl group,
These include propyl group, inpropyl group, etc.

Preferred N-acylamino-11 salts include N-lauroylglutamic acid, N-mylinutoylglutamine,
N-acyl amino acids such as N-valmitoylglutamic acid, N''-mi'7nutoylpetaalanine, N-valmitoylbetaalanine, and N-lauroyl N-ethylglycine, N-lauroyl N-isopropylglycine, Sodium, lithium, and monoethanol of N-acyl N-alkyl amino acids such as N-lauroylsarcosine, N-mylinutoylsarcosine, N-no and lumitoylsarcosine, and N-la'yroyl N-methylbeta-alanine. There are amine, noethanolamine, and triethanolamine groups.

The amount of the N-acylamino acid salt to be blended is preferably 3 to 30% of the total detergent composition, more preferably <5%.
~20 weight class. Within this range, particularly remarkable effects are exhibited.

The saponin blended into the liquid detergent of the present invention is a glycoside widely distributed in the physical world, and its sugar components include glucose,
Caractone, arabinose, uronic acid, etc., and the non-carbohydrate part (aglycone) is a polycyclic compound.
This is what is called regular sapokunin. mackerel? There are two types of genin: those belonging to triterpenoids and those belonging to hepteroids. Typical examples of the former include hederagenin contained in Ivy and carrots contained in Horse chestnut; representative examples of the latter include digitognin and gitognin found in Nogitalis.

Conventionally, saponin has been known to have foaming properties, stimulating effects on mucous membranes, hemolytic effects, etc., but it has not been known that it has the effect of improving foam performance when added to cleaning agents. Ta.

Commercially available saponins are obtained by extracting saponin-containing plant tissues with water and/or other organic solvents such as alcohol or polyethylene glycol, followed by precipitation, recrystallization, and the like.

Plants that contain saponin include licorice, Senega, and Kirayasa? There are Naria, Korean carrot, pomegranate, bellflower, akebi, marigold, etc.

The amount of saponin to be blended is preferably 0% of the total detergent composition.
．． 01 to 10% by weight, more preferably 1.0 to 10% by weight. Within this range, particularly remarkable effects are exhibited.

As mentioned above, improving the foam performance of amino acid-based surfactants is a big problem, and it is necessary to improve the foam properties while taking advantage of their characteristics such as safety and mild effects on the skin and hair. Although it was difficult to describe, such problems have been solved by the present invention, and it has become possible to apply amino acid-based surfactants to liquid detergents such as shampoo.

This improvement in foam properties by the detergent of the present invention is believed to be due to the formation of mixed micelles with the N-acylamino acid salt and saponin.

The liquid detergent of the present invention may also contain anionic, ionic, nonionic, and amphoteric surfactants as optional components. Examples of such surfactants include higher alcohol sulfates, alkylbenzene sulfonates, direct fa alkylbenzene sulfonates,
Anionic surfactants such as alkylnaphthalene sulfonate, alkyl phosphate, polyoxyethylene sulfate, α-olefin sulfate, polyoxyethylene alkyl ether 1, +f IJ oxyethylene alkyl phenol ether, sorbitan fatty acid ester, polyoxyethylene Examples include nonionic surfactants such as ethylene acyl esters, cationic surfactants such as alkylamine salts and quaternary ammonium salts, and amphoteric surfactants such as alkyl betaines. These surfactants can be used alone or in an appropriate combination of two or more.

Furthermore, the liquid cleaning agent of the present invention also contains, as additional components,
For example, it is also possible to blend inorganic building blocks such as sodium tripolyphosphate, sodium metasilicate, and Glauber's salt, CMC1 lower alcohol, antifoaming agents, fluorescent dyes, coloring agents, fragrances, and the like.

Next, the liquid cleaning agent of the present invention will be explained in more detail based on the following experimental examples 1. Prior to that, the outline of the test method and evaluation method adopted in the experimental example will be explained.

Skin irritation was evaluated using the following two methods (1) and (2). (1) Sensory evaluation Using a 1% aqueous solution (35°C) of a liquid detergent composition, 1,000 test results were obtained by 10 testers. This is an evaluation based on an immersion test. That is, the dipping-drying operation was performed 15 times at 1-minute intervals, and the degree of rough skin on the hands was visually judged after 24 hours using the following criteria.

○: Almost no skin roughness △: Partial dry exfoliation change in the stratum corneum surface layer of the skin ×: Dry exfoliation change in more than 30% of the skin (2, I BSA molecular ellipticity Bovine serum albumin molecular ellipticity (BSA This is an evaluation using molecular ellipticity) as an indicator.

BSA molecular ellipticity ij1! The I standard method is as follows.

That is, after mixing 100 pPm of bovine serum albumin and a liquid detergent composition, a sodium phosphate buffer was added to give a concentration of 50 mM, and JASCOCD S was added at 25°C.
Measure the circular dichroism with a pectropolar meter and find the molecular ellipticity (by the way, undenatured) bovine blood 7# argumin has a molecular ellipticity of -11.3 06
deg-d/dec1 mol. By the way, is the molecular ellipticity of real blood? It is equivalent to if albumin and shows no denaturation. (The numerical unit in the table is -[θ)XIO'.

) 20ml (25°C) of a 6-layer aqueous solution of a foaming liquid detergent composition
00ml cylinder, add 0.2!7 of liquid lanolin as artificial dirt to it, shake it 20 times for 10 seconds, and measure the foam volume (ml) after 1 minute.

Feel of foam (sensory evaluation) Hair is divided into two parts, three comparative samples, test samples, and three test samples are applied to each side, and after lathering, the feel of the foam is evaluated and judged by 10 testers based on the standard under the shavings. do. In addition, as a comparative sample, polyoxyethylene alkyl ether sulfate) lithium (average number of EO added moles H=a, alkyl group: C12
/CI! , ='/1)-AES-Na was used.

”-10: Foam feel is clearly superior to AES-Na.

10: Excellent for AES-Na and foamy hornworms.

Soil: The feel of foam is similar to that of AES-Na.

: Foam feel is inferior to AES-Na.

--: Very poor foam feel compared to AES-Na.

Test Example 15 types of liquid cleaning compositions having the compositions shown in the table below were tested at NpJ.
jd and evaluated their performance. The results are shown in the same table. Incidentally, the blending amounts in the table are weight t %.

As is clear from the table, the cleaning compositions containing both N-acyl amino acid salt and saponin (Examples 1 to 6) all exhibit excellent performance, whereas the detergent compositions containing both N-acyl amino acid salt and saponin exhibit excellent performance. All of the cleaning compositions (Comparative Examples 1 to 9) have poor performance.

Claims (1)

[Claims] A liquid cleaning agent containing N-acyl amino acid salt and zaponin.