JP7132002B2 - transparent solid detergent - Google Patents

Description

The present invention relates to a transparent solid detergent containing an N-acyl acidic amino acid salt as an ingredient.

Transparent solid cleansing agents with a high aesthetic appearance are widely used not only as soaps for gifts but also as face soaps for women.
Conventionally, transparent solid detergents are mainly composed of a higher fatty acid salt and a clarifying agent such as glycerin, sucrose or sorbitol. However, the above-mentioned conventional transparent soaps are not sufficiently transparent, and there is a problem that the surface of the soap gels and becomes opaque during use.

In recent years, transparent solid detergents based on N-acyl acidic amino acid salts have been developed. There is a problem of inferior usability such as quality (Patent Document 1).

In order to overcome such drawbacks, a technique of a transparent solid detergent composition comprising an N-acyl acidic amino acid salt composed of an alkali metal salt and an ethanolamine salt has been disclosed (Patent Document 2). This transparent solid detergent exhibits excellent foaming properties, but has the problem of poor hardness, large adhesion to soap containers, and easy consumption.
Further, as an improvement of the transparent solid detergent described above, a technique of a transparent solid detergent composition comprising an N-acyl acidic amino acid salt composed of a potassium salt, a sodium salt and an ethanolamine salt has been disclosed. is not sufficient, and it has a problem of being easily softened under high-temperature and high-humidity storage (Patent Document 3).

Furthermore, a technique of a transparent solid detergent composition in which an acylglycine salt is blended with an N-acyl acidic amino acid salt is disclosed (Patent Document 4). Although the usability has been greatly improved, there is a problem that increasing the blending ratio of the acylglycine salt deteriorates the stability at high temperatures and lowers the hardness.
To date, no fully satisfactory transparent solid detergent composition has been developed.

JP-A-55-25465 JP-A-4-1297 JP-A-6-264092 WO2016/060207

An object of the present invention is to provide a novel transparent solid detergent.

As a result of extensive research, the present inventors have found that by blending N-acylglutamic acid and N-acyl neutral amino acid in a specific ratio, converting them into a triethanolamine salt, and further blending urea in a specific ratio, 3. The feeling of use (foaming, foam volume, foam quality, foam elasticity) can be improved compared to conventional transparent solid detergents mainly composed of N-acyl acidic amino acid salts as described in Patent Document 1. and completed the present invention.

The gist of the present invention is as follows.
[1] a triethanolamine salt of N-acylglutamic acid;
a triethanolamine salt of an N-acyl neutral amino acid;
urea and
In the raw material formulation, N-acylglutamic acid: 10 to 40% by weight, N-acyl neutral amino acid: 5 to 20% by weight, urea: 5 to 20% by weight, N-acylglutamic acid and N-acyl neutral amino acid is 50:50 to 85:15 by weight,
A transparent solid detergent having a total degree of neutralization of N-acylglutamic acid and N-acyl neutral amino acids of 80-100%.
[2] The transparent solid detergent of Claim 1, wherein the N-acyl neutral amino acid is N-acyl-N-methyl-β-alanine or N-acylsarcosine.

ADVANTAGE OF THE INVENTION According to this invention, a novel transparent solid detergent can be provided.

The present invention relates to a transparent solid detergent containing a salt of unneutralized N-acylglutamic acid and triethanolamine and a salt of unneutralized N-acyl neutral amino acid and triethanolamine.

Unneutralized N-acylglutamic acid and unneutralized N-acyl neutral amino acid used in the present invention are commonly available on the market.
Unneutralized N-acylglutamic acid (component (A1)) includes N-lauroylglutamic acid, N-myristoylglutamic acid, N-stearoylglutamic acid, N-cocoyl (coconut fatty acid acyl)glutamic acid and the like. For example, one of these can be used alone or in combination of two or more as needed. from 15 to 30% by weight.
If the amount of N-acylglutamic acid is less than 10% by weight, the hardness is lowered and the formulation as a transparent solid detergent cannot be maintained. It can be difficult.

Unneutralized N-acyl neutral amino acids (component (A2)) include N-lauroyl-methyl-β-alanine, N-myristoyl-methyl-β-alanine, N-stearoyl-methyl-β-alanine, N - N-acyl-N-methyl-β-alanine such as cocoyl-methyl-β-alanine, N-lauroylsarcosine, N-myristoylsarcosine, N-stearoylsarcosine, N-acylsarcosine such as N-cocoylsarcosine, N- N-acylglycine such as lauroylglycine, N-myristoylglycine, N-stearoylglycine, N-cocoylglycine, etc., and N-acyl-N-methyl-β-alanine or N-acylsarcosine is preferred from the viewpoint of lathering. . For example, one of these can be used alone or in combination of two or more as needed. From the viewpoint of amount, foam quality, foam elasticity) and stability, it is preferably 5 to 15% by weight. If the blending amount is less than 5% by weight, sufficient effects on foaming, foam volume, foam quality, and foam elasticity cannot be exhibited.

The weight ratio of components (A1) and (A2) in the present invention is 50:50 to 85:15, preferably 55:45 to 80:20 from the viewpoint of foamability and foam volume. Within this range of 50:50 to 85:15, it is possible to provide a transparent solid detergent having good transparency and hardness, and excellent usability such as foaming and foam quality. When component (A2) is added at a ratio exceeding 50:50, the stability under high-temperature storage may deteriorate, and when component (A1) is added at a ratio exceeding 85:15, sufficient usability is not obtained. sometimes not.
The transparent solid detergent of the present invention contains these triethanolamine salts in which component (A1) and component (A2) are neutralized with triethanolamine. The total degree of neutralization defined by the following formula for N-acylglutamic acid and N-acyl neutral amino acids is 80-100%, more preferably 82-100%. If the total degree of neutralization is less than 80%, the transparency and hardness will be lowered.

In the present invention, urea (component B) is contained in addition to triethanolamine salts of components (A1) and (A2). Urea is 5 to 20% by weight in the total composition of raw materials, and preferably 5 to 16% by weight from the viewpoint of low-temperature storage stability. If the blending amount is less than 5% by weight, the hardness is lowered, and if it exceeds 20% by weight, problems such as devitrification due to crystallization occur.

From the viewpoint of hardness and transparency, the transparent solid detergent of the present invention should contain polyhydric alcohols such as glycerin, propylene glycol, sorbitol, ethylene glycol and diglycerin, and sugar in a proportion of 5 to 30% by weight. is preferred.
Moreover, the transparent solid detergent of the present invention preferably contains 0.5 to 10% by weight of a lower alcohol such as ethyl alcohol or isopropyl alcohol from the viewpoint of manufacturing time and cost.

In the transparent solid detergent of the present invention, various commonly used additives can be added as long as they do not impair the effects of the present invention. Other ingredients that are commonly used in cosmetics for the purpose of adjusting cleansing properties and texture, such as extracts derived from animals, plants, fish and shellfish, microorganisms, powder ingredients, liquid oils, solid oils, waxes, and hydrocarbons. , higher fatty acids, higher alcohols, esters, silicones, anionic surfactants, cationic surfactants, amphoteric surfactants, nonionic surfactants, moisturizing agents, water-soluble polymers, thickeners, film agents, ultraviolet rays Absorbents, antiphlogistic agents, sequestering agents, sugars, amino acids, organic amines, synthetic resin emulsions, pH adjusters, skin nutrients, vitamins, antioxidants, antioxidant aids, fragrances, water, etc. The above may be added, if necessary, in an amount within a range that does not interfere with transparent solidification.

In particular, the addition of a cationic polymer, which is a type of water-soluble polymer, can increase the foamability and further improve the feeling of use. Preferable examples of cationic polymers include cationized cellulose and cationized guar gum.
The method for producing the transparent solid detergent of the present invention is not particularly limited and can be determined appropriately by those skilled in the art. Specifically, it can be produced by, for example, a frame kneading method. In the case of the frame kneading method, the above (A1) unneutralized N-acylglutamic acid, (A2) unneutralized N-acyl neutral amino acid, triethanolamine, (B) urea, water, and if necessary A mixture of other components contained is heated to 70° C. to 90° C. and melted uniformly, poured into a mold and cooled to solidify. Then, through dry aging, a transparent solid detergent can be obtained.

As described above, according to the present invention, a novel transparent solid detergent can be provided. Compared with conventional transparent solid detergents mainly composed of N-acyl acidic amino acid salts as described in Patent Document 1, the transparent solid detergent has a better feel during use (foaming, foam volume, foam quality, foam quality, etc.). elasticity) is very good.

The effects of the present invention will be described in more detail with reference to Examples, but the present invention is not limited to these Examples.
Various transparent solid detergents whose ingredients are shown in Table 1 were produced by the frame kneading method and evaluated according to the following evaluation items.

<Regarding manufacturability evaluation>
Manufacturability was evaluated according to the following criteria:
×: Gelation or poor solidification occurs during production 〇: Products that can be manufactured Note that gelation or poor solidification occurs is not subject to other evaluations shown below ("-" in the table) ”).

<Regarding evaluation of transparency>
A transparent solid detergent with a thickness of 20 mm was placed on a 26-point type, and whether or not it was legible was judged and evaluated according to the following evaluation criteria.
◎: Clearly legible ○: Legible △: Somewhat legible ×: Unreadable

<Regarding evaluation of hardness>
Each transparent solid detergent was judged and evaluated based on the following criteria based on the feel of the detergent to see if it had sufficient hardness as a solid detergent.
○: Sufficiently hard △: Practical hardness as a solid detergent, but somewhat insufficient ×: Not practical at all

<Regarding the evaluation of usability>
Each transparent solid detergent was washed by hand with tap water at 40°C, and evaluated for foaming, foam volume, foam quality (creaminess of foam (softness felt when touching foam)), elasticity of foam, and ease of rinsing. was evaluated according to the following criteria. Evaluation was performed by five panelists according to the following evaluation criteria, with an average value of 4.0 to 3.5 or more ◎, less than 3.5 to 2.5 or more ○, and less than 2.5 to 1.5 or more △ , and less than 1.5 were evaluated as x.
In addition to evaluating each evaluation item, we judged that the feeling of use was better for items with a large number of items with higher evaluations. was judged to have a better feeling of use).

<Evaluation criteria for foaming, foam volume, foam quality, foam elasticity, and rinsability>
4: very good 3: good 2: somewhat bad 1: bad

<Evaluation of low-temperature storage stability>
Each transparent solid detergent was wrapped in a stretch film, stored at 5°C for 1 month, returned to room temperature, and evaluated according to the following criteria.
○: Transparent and having sufficient hardness △: Transparent but slightly dull ×: Devitrification due to precipitation

<Evaluation of high temperature storage stability>
After each transparent solid detergent was wrapped in a stretch film, it was stored for 3 months under the conditions of 40° C. and 75% RH, and after returning to room temperature, it was judged and evaluated according to the following criteria.
○: Transparent and having sufficient hardness △: Transparent but slightly softened ×: Softened and deformed

<Regarding the total degree of neutralization>
Total degree of neutralization was calculated by the following method.

Comparative Example 1 is a case in which no acyl neutral amino acid was added to Example 1, but in this case, the usability (foaming, foam volume, foam quality, foam elasticity) was inferior.
Comparative Example 2 is an example in which an anionic active agent that does not correspond to an N-acyl neutral amino acid is blended. was not possible.
Comparative Example 3 is an example in which a sodium salt of an acyl neutral amino acid is blended. It also resulted in poor stability.
Comparative Examples 4 and 5 are examples in which an anion active agent that does not correspond to an N-acyl neutral amino acid is blended as a sodium salt, but are carried out in terms of usability (foaming, foam volume, foam quality, foam elasticity). The result was inferior to the example.
Comparative Example 6 is an example in which the amount of the N-acyl neutral amino acid is less than 5% by weight, but the usability (foaming, foam volume, foam quality, foam elasticity) is inferior to that of Examples. became.
Comparative Example 7 is an example in which the amount of N-acylglutamic acid is less than 10% by weight. result was not possible.
Comparative Example 8 is an example in which the blending amount of urea is less than 5% by weight, but the hardness and stability are significantly lower than those of Examples, and the dosage form as a transparent solid detergent cannot be maintained. result was not possible.
Comparative Example 9 is an example in which the blending amount of urea is more than 20% by weight. was not possible.
Comparative Example 10 is an example in which the amount of N-acylglutamic acid is more than 40% by weight.
Comparative Example 11 is an example in which the amount of the N-acyl neutral amino acid is more than 20% by weight. result was not possible.
On the other hand, all of the transparent solid detergents of Examples 1 to 12 were judged to be clearly legible in terms of transparency, and in terms of hardness, they were able to maintain their shapes as solid detergents. Furthermore, usability (foaming, foam volume, foam quality, foam elasticity, ease of rinsing) was all judged to be good or very good, and compared to Comparative Example 1, foaming, foam volume, foam quality, and foam elasticity I understand that it is excellent. Furthermore, the low-temperature storage stability and high-temperature storage stability were evaluated to be equal to or higher than those of the comparative examples.

Claims (2)

containing a triethanolamine salt of N-acylglutamic acid, a triethanolamine salt of an N-acyl neutral amino acid , and urea;
In the raw material formulation, N-acylglutamic acid: 10 to 40% by weight, N-acyl neutral amino acid: 5 to 20% by weight, urea: 5 to 20% by weight, N-acylglutamic acid and N-acyl neutral amino acid is 50:50 to 85:15 by weight,
A transparent solid detergent having a total degree of neutralization of N-acylglutamic acid and N-acyl neutral amino acids of 80-100%. 2. The transparent solid detergent according to claim 1, wherein the N-acyl neutral amino acid is N-acyl-N-methyl-β-alanine or N-acylsarcosine.