CLEANSING FOAM COSMETIC COMPOSITION COMPRISING AMINO ACID-BASED SURFACTANT

Abstract

To provide a cleansing foam cosmetic composition that does not cause skin irritation and has a mild feeling of use.SOLUTION: The present invention relates to a cleansing foam cosmetic containing an amino acid-based surfactant. More specifically, the cleansing foam cosmetic contains the amino acid-based surfactant that consists of only sodium lauroyl glutamate, sodium cocoyl glycinate and potassium cocoyl glycinate, while not using nonionic or amphoteric surfactants.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a cleansing foam cosmetic composition containing an amino acid-derived surfactant, and more specifically, is characterized in that the composition does not contain a nonionic or ionic surfactant, but contains an amino acid-derived surfactant consisting only of sodium lauroyl glutamate, sodium cocoyl glycinate, and potassium cocoyl glycinate. [Background technology]

[0002] Generally, cleansing agents are common cosmetic products used to cleanse the skin, removing various waste products such as sweat, sebum, dust, aged keratin, makeup residue, and other contaminants from the surface of the skin, keeping the skin moist and healthy.

[0003] Soap was often used as a cleansing agent, mainly used to wash the skin. However, soap is strongly alkaline, with a pH of about 9 to 10, and can irritate weak skin. In addition, most soaps contain little moisturizing ingredients for the skin and are made only for cleansing, so if used on dry skin, it can cause skin tightness and roughness.

[0004] Cleansing foams have been developed to overcome these shortcomings of ordinary soaps. Cleansing foams are primarily developed for washing sensitive skin such as the face, and generally have a lower pH (mainly neutral or slightly acidic) and contain moisturizing ingredients.

[0005] Conventionally used surfactants are mostly petroleum-based surfactants made by extracting crude oil and going through several processes, and it is known that such petroleum-based surfactants cause environmental pollution problems and problems with stability in the human body. That is, when absorbed into the skin, they can destroy the skin barrier and cause itching and dermatitis, and when repeatedly exposed for a long period of time, they can cause hair loss, allergies, atopic immune suppression, etc. Therefore, due to these problems, there is a trend of active research into the development of environmentally friendly biosurfactants to replace petroleum-based surfactants.

[0006] Biosurfactants have been defined as surface-active biomolecules produced by microorganisms with a wide range of applications, but more recently have been defined to include all surfactants made using renewable natural plant sources.

[0007] Amino acids have been frequently used in the synthesis of surfactants due to their excellent biodegradability and surface activity that can efficiently lower surface energy. Amino acid-based surfactants synthesized using amino acids have excellent biocompatibility, multifunctionality, non-toxicity, and non-irritation properties, and are harmless to aquatic organisms and have the advantages of excellent biodegradability. In addition, many amino acid-based surfactants, including n-acyl amino acid-based surfactants, are known to have bactericidal properties against disease-causing microorganisms.

[0008] However, amino acid surfactants basically have two functional groups, an amine group and a carboxyl group, but these amino acid compounds generally have low reactivity with higher fatty acids or higher alcohols, so it has been reported that a large amount of unreacted material remains. In addition, an additional process is required to remove the unreacted fatty acids, and the economical advantage is not great. Therefore, a method for synthesizing amino acid anionic biosurfactants using natural raw materials such as coconut oil has been studied.

[0009] On the other hand, while general amino acid-based surfactants have the advantages of being gentle on the skin and highly biodegradable, they also have the disadvantages of lacking sufficient foaming ability to generate foam and insufficient cleaning power to remove pollutants.

[0010] In order to solve the problem of reduced cleaning power, there have been many studies on mixing various amino acid-based surfactants with synthetic surfactants or amphoteric surfactants (see Patent Documents 1 to 5 below). In some cases, the foaming power or cleaning power (rinsing power) may differ depending on the mixing ratio of each surfactant.

[0011] In addition, non-ionic surfactants may also be used for solubilizing and emulsifying / dispersing functions.

[0012] In general, mixing surfactants with different properties rather than using only one type of surfactant is a research method that partially utilizes the use of a mixture of surfactants with different properties, as these mutually complement each other's shortcomings; however, it is difficult to resolve the issue of environmental friendliness.

[0013] Therefore, there is a demand for new cleansing foam cosmetics that are mild to the skin, yet soft, and that do not lose foaming power or cleaning power even when using surfactants that are highly biodegradable. [Prior art documents] [Patent documents]

[0014] [Patent Document 1] Korean Patent No. 10-1042717 [Patent Document 2] Korean Patent Publication No. 10-2017-0058146 [Patent Document 3] Korean Patent Publication No. 10-2019-0090841 [Patent Document 4] International Publication No. 2017 / 106276 [Patent Document 5] China Patent Application Publication No. 105902411 [Non-patent literature]

[0015] [Non-Patent Document 1] Yedanan et al., "Synthesis and Interfacial Properties of Amino Acid-Based Anionic Surfactants Derived from Coconut Oil," Appl. Chem. Eng., Vol. 29, No. 5, October 2018, 524-532. Summary of the Invention [Problem to be solved by the invention]

[0016] The present invention has been made in view of the above-mentioned conventional techniques, and an object of the present invention is to provide a cleansing foam cosmetic composition which is non-irritating to the skin and has a mild feel when used.

[0017] The object of the present invention is to provide a cleansing foam cosmetic composition in a formulation that does not contain any ionic or nonionic surfactants, but uses only amino acid-based biosurfactants that are environmentally friendly, and can maintain its cleaning power, foaming power, and foam retention power. [Means for solving the problem]

[0018] In order to achieve the above object, the cleansing foam cosmetic composition of the present invention contains an amino acid-derived surfactant consisting of (A) sodium lauroyl glutamate, (B) sodium cocoyl glycinate, and (C) potassium cocoyl glycinate.

[0019] The cleansing foam cosmetic contains 7 to 25% of (A) sodium lauroyl glutamate, 7 to 25% of (B) sodium cocoyl glycinate, and 1 to 5% of (C) potassium cocoyl glycinate, based on the total weight of the cleansing foam cosmetic.

[0020] The cleansing foam cosmetic is characterized in that the weight ratio of (A) sodium lauroyl glutamate, (B) sodium cocoyl glycinate, and (C) potassium cocoyl glycinate is 10:10:1.4. If necessary, the weight ratio may be selected within the range of 7:7:1 to 13:13:1.4.

[0021] The cleansing foam cosmetic further contains water, an antioxidant, and a moisturizing agent. Effect of the Invention

[0022] As described above, the cleansing foam cosmetic according to one embodiment of the present invention (example) is excellent in that it does not irritate the skin and has a mild feel after use.

[0023] Furthermore, since the present invention uses only environmentally friendly amino acid-derived surfactants, it is highly biodegradable and also exhibits excellent properties in terms of cleaning power, foaming power and foam retention. [Brief description of the drawings]

[0024] [Figure 1] This is a graph comparing the cleaning power of three types of amino acid-based surfactants when used alone and in combination. [Diagram 2] FIG. 1 is a graph showing the degree of bubble generation for each surfactant over time. [Diagram 3] FIG. 13 is a graph showing the degree of air bubble retention observed over time after each surfactant was discharged. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0025] It is to be understood that the present invention is not intended to be limited to the specific disclosed embodiments, but rather to encompass all modifications, equivalents, and alternatives falling within the spirit and scope of the present invention.

[0026] In addition, the terms used in the present invention are merely used to describe a specific embodiment and are not intended to limit the present invention. Unless otherwise clearly indicated in the context, all terms used in this specification, including technical or scientific terms, have the same meaning as commonly understood by a person having ordinary knowledge in the technical field to which the present invention belongs.

[0027] As a result of research and efforts made by the present inventors to overcome the problems of the prior art, it was discovered that a cleansing foam made from a combination of only certain types of amino acid-based surfactants is mild to the skin and environmentally friendly, while also having excellent properties in terms of cleaning power, foaming power, and foam retention.

[0028] Amino acid-based anionic surfactants penetrate between the waste matter and the surface to be washed, such as the scalp or hair, to weaken the adhesion of the waste matter, making it easier to wash by physical force. The appropriate cleansing properties and foaming power of such anionic surfactants act as important factors in removing waste matter from the scalp and hair.

[0029] In general, amino acid-based surfactants are widely known as surfactants for the production of typical low-irritation detergents, and are also known to have good biodegradability. However, they often do not foam well, and leave a slippery and sticky feeling after rinsing, and they have problems with increasing unit costs.

[0030] The amino acid surfactants suitable for use in the cleansing foam cosmetic of the present invention can be appropriately selected and used depending on the purpose. For example, acidic amino acid series such as N-acyl glutamates and weakly alkaline amino acid series close to neutral such as acyl glycinates can all be used.

[0031] In particular, it is most preferable to select sodium lauroyl glutamate, sodium cocoyl glycinate, and potassium cocoyl glycinate, which are obtained from natural sources.

[0032] The sodium lauroyl glutamate is an anionic surfactant component derived from glutamic acid (amino acid), lauric acid and sodium, obtained from coconut oil or palm oil. It is characterized by its excellent biodegradability to plant-based ingredients that can replace synthetic surfactants. It contributes to stabilizing components that do not mix inside cosmetics by acting as an active agent that adsorbs to the interface of each substance to make them mix well. In particular, it is widely used as a cleansing ingredient that is weakly acidic, the same as the pH of the skin, and has a soft finish, making it comfortable to use.

[0033] The sodium cocoyl glycinate and potassium cocoyl glycinate are anionic surfactants derived from plant-derived amino acids extracted from coconut fruit with a pH of 8 to 9. They are naturally derived ingredients that are biodegradable and safe with little irritation to the skin. They have excellent foam generation capabilities, allowing for gentle cleansing, and have soft foam, high cleaning power, and a moist feel when used.

[0034] Therefore, by appropriately combining the three above-mentioned components, a mild cleansing foam cosmetic can be produced that has high skin safety and improved usability, and has a more excellent cleaning or foaming effect.

[0035] According to a preferred embodiment of the present invention, the content of the amino acid anionic surfactant is 15 to 30% by weight, preferably 20 to 25% by weight, based on the total weight of the composition. If the content of the amino acid anionic surfactant is less than 15% by weight, problems such as insufficient foam elasticity and reduced ability to alleviate skin irritation may occur, whereas if it exceeds 30% by weight, problems such as increased hardness and poor usability may occur.

[0036] The cleansing foam cosmetic contains 7 to 25% by weight of (A) sodium lauroyl glutamate, 7 to 25% by weight of (B) sodium cocoyl glycinate, and 1 to 5% by weight of (C) potassium cocoyl glycinate relative to the total weight of the cosmetic. The weight ratio (A:B:C) of the amino acid surfactants is most preferably 10:10:1.4. If necessary, the weight ratio of the components can be selected within the range of 7:7:1 to 13:13:1.4.

[0037] In addition to the above-mentioned essential components, the cleansing foam cosmetic of the present invention may contain the remaining amount of purified water, antioxidants, beauty agents, moisturizers, ultraviolet absorbers, fragrances, and other ingredients that are commonly used in cosmetics, provided that the effects of the present invention are not impaired.

[0038] In the present invention, the moisturizing agent for imparting moisturizing feeling after washing includes polyhydric alcohol. For example, the polyhydric alcohol may be any one or more selected from the group consisting of glycerin, diglycerin, 1,3-butylene glycol, ethylene glycol, propylene glycol, dipropylene glycol, sorbitol, maltitol, 1,2-pentanediol, 1,2-hexanediol, etc., but is not limited thereto.

[0039] The method for producing the cleansing foam cosmetic of the present invention is not particularly limited. The produced formulation is in the form of a cream or paste.

[0040] The present invention will be described in more detail below based on preferred embodiments.

[0041] Embodiment: Investigation of the characteristics of a combination of surfactants for the production of a cleansing foam cosmetic Table 1 below shows the content ratios of the three amino acid surfactants when used alone and in combination. Each of Samples 1 to 6 was examined for cleaning power, foaming power, and foam retention power.

[0042] [Table 1]

[0043] Experimental example 1. Detergency evaluation A waterproof mascara, waterproof eyebrow pencil and lipstick with strong color and long-lasting power were evenly applied to an area 5cm wide x 1cm long on the inside of the lower arm of a human body and left for 10 minutes, after which a cleaning test was conducted using the six sample surfactants (21.4% sol.). The area was rubbed in a circular motion 30 times with the same amount of about 10ml and the same pressure, and then rinsed with lukewarm water to remove the water.

[0044] As a result, as shown in Figure 1, in the case of waterproof mascara, almost nothing was removed, but in the case of waterproof eyebrow and lipstick, the cleaning power was higher when surfactants were used in combination (samples 4, 5, 6) than when surfactants were used alone (samples 1, 2, 3). In particular, the results for sample 5 showed the best cleaning power.

[0045] Experimental example 2. Air bubble strength evaluation 20 g of 1% sol. of the surfactant samples 1 to 6 was placed in a 100-vial container, shaken up and down 10 times, and the degree of bubble generation after stirring was observed over time. As shown in Figure 2, samples 4 and 5 were observed to have excellent foaming power.

[0046] Experimental Example 3: Air bubble retention evaluation 20g of 1% sol. of the surfactant samples 1 to 6 was placed in an Autoform container, and after discharging three times, observations were made over time. As shown in Figure 3, most of the samples maintained foam even after one hour, and samples 3 and 5 in particular were observed to have excellent foam retention.

[0047] Experimental example 4. Dosage form test In order to investigate the feasibility of achieving a dosage form depending on the surfactant ratio, eight samples were manufactured and compared. Based on the results of the above experimental examples, Examples 1 to 6 and Comparative Example 1 were manufactured by mixing surfactants (A) sodium lauroyl glutamate, (B) sodium cocoyl glycinate, and (C) potassium cocoyl glycinate at a constant ratio.

[0048] In particular, when the total amount of the three types of surfactants was between 15% and 30% by weight, hardness was formed, and the most preferable hardness value was obtained when the total amount was between 20% and 25% by weight.

[0049] Among these, potassium cocoyl glycinate needs to be maintained at 1.4% or more. However, if the content is relatively high compared to the other two types (corresponding to Comparative Example 1), it will be difficult to use in tube containers because the viscosity will not be optimal, which will cause problems in commercialization.

[0050] On the other hand, in Comparative Example 2, which was prepared by further adding other ionic surfactants (sodium lauryl sulfate and cocamidopropyl betaine) in addition to the amino acid surfactant, the hardness was too low to measure. Instead, the viscosity was measured and found to be low (6,000 at LV4 x 30 RPM).

[0051] That is, in the present invention, it was confirmed that adding and mixing a surfactant with a different property does not compensate for the shortcomings, but rather acts to reduce the desired effect by half.

[0052] Here, the hardness range of the dosage form desired by the present invention is 50 to 300 N, preferably 50 to 100 N. The most preferable range is 85 to 95 N.

[0053] [Table 2]

[0054] Experimental Example 5. Skin irritation evaluation An experiment was conducted on a panel of 15 people to compare skin irritation after using the compositions of embodiment (Example) 3 according to the present invention and comparative example 2. The experiment on skin irritation involved applying each composition to the back of the hand, leaving it for 5 minutes, and finishing by washing with water, and then comparing the irritation felt by the panelists. Each item of itching, erythema, hives, and tingling was scored from 0 to 5 (the higher the score, the higher the irritation), and the results are shown in Table 3 below.

[0055] Although the skin irritation index of both of the above compositions was not high overall, it can be seen that the level of irritation (especially itching) was much lower in Example 3, which used only an amino acid-derived surfactant, than in Comparative Example 2, which added an ionic surfactant.

[0056] [Table 3]

Claims

1. A cleansing foam cosmetic composition comprising an amino acid-based surfactant, the amino acid-based surfactant being composed solely of (A) 7-15% by weight of sodium lauroyl glutamate, (B) 7-15% by weight of sodium cocoyl glycinate, and (C) 1.4-2.8% by weight of potassium cocoyl glycinate, without using any nonionic surfactant, relative to the total weight of the cleansing foam cosmetic.

2. 2. The cleansing foam cosmetic composition according to claim 1, wherein the weight ratio of (A) sodium lauroyl glutamate, (B) sodium cocoyl glycinate, and (C) potassium cocoyl glycinate is 10:10:1.

4.

3. The cleansing foam cosmetic composition according to claim 1, further comprising water, an antioxidant and a moisturizing agent.

4. The cleansing foam cosmetic composition according to claim 3, wherein the moisturizer is at least one selected from the group consisting of glycerin, diglycerin, 1,3-butylene glycol, ethylene glycol, propylene glycol, dipropylene glycol, sorbitol, maltitol, 1,2-pentanediol, and 1,2-hexanediol.

5. The cleansing foam cosmetic composition according to any one of claims 1 to 4, wherein the composition is in the form of a cream or a paste.

6. A method for producing the cleansing foam cosmetic composition according to any one of claims 1 to 4.

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