JP2023127180A - Facial cleanser - Google Patents

Abstract

To provide a facial cleanser whose viscosity can be adjusted to provide an appropriate feeling of use depending on the formulation.SOLUTION: The facial cleanser contains (A) an amino acid-based anionic surfactant, (B) a fatty acid potassium salt, (C) a sulfobetaine-type amphoteric surfactant, and (D) water. By containing these components at a predetermined ratio, the viscosity becomes 200 mPa S or more, and the viscosity can be adjusted so as to obtain an appropriate feeling of use as a facial cleanser according to the formulation.SELECTED DRAWING: None

Description

The present invention relates to a facial cleanser using an amino acid surfactant as a cleansing ingredient.

BACKGROUND ART Fatty acid soaps have been widely used as cleaning agents for cleaning the skin and other parts of the body. Fatty acid soap is a soap composed of fatty acid salts obtained by neutralizing higher fatty acids with a base. While fatty acid soaps have excellent detergency, foaming properties, and water solubility, they tend to have strong degreasing properties and are highly irritating to the skin, making the skin feel tight after use. Therefore, they were not necessarily suitable as facial cleansers, especially for cleaning sensitive skin such as the face.

Therefore, amino acid-based cleaning agents that use amino acid-based surfactants as cleaning ingredients have attracted attention. Amino acid surfactants are characterized by being weakly acidic to neutral and less irritating to the skin (see, for example, Patent Document 1), and are suitably used in facial cleansers that require low irritation.

Special Publication No. 2015-523973

Incidentally, facial cleansing agents come in various dosage forms depending on the user's preferences and uses, and the viscosity is required depending on the dosage form. However, amino acid surfactants are difficult to maintain viscosity, and when used as a facial cleanser, the viscosity is generally adjusted by appropriately combining polymeric materials. Since viscosity basically depends on the amount of polymeric material, dosage forms that require high viscosity require a large amount of polymeric material. However, if the amount of the polymeric material increases, adverse effects caused by the polymeric material may occur, such as an excessively slimy feeling.

The present invention was made to solve the above problems, and provides a facial cleanser that uses an amino acid-based surfactant as a cleansing ingredient and whose viscosity can be adjusted to provide an appropriate feeling of use depending on the dosage form. The purpose is to provide

In order to achieve the above object, the present invention
Component (A) Amino acid-based anionic surfactant Component (B) Fatty acid potassium salt Component (C) Sulfobetaine type amphoteric surfactant Component (D) A facial cleanser containing water and having a viscosity of 200 mPa·S or more. .

Further, the pH of the above facial cleanser is preferably 7 to 10.

Further, in the facial cleanser, the content of the component (C) is preferably 1/2 or more of the content of the component (A).

Further, in the facial cleanser, the content of the component (B) is preferably ⅛ or more of the content of the component (A).

Further, in the facial cleanser, the content of the component (B) is preferably 1/2 or more of the content of the component (C).

Moreover, in the above-mentioned facial cleanser, it is preferable to further contain component (E) glycol ether, glyceryl alkyl ether, or alkanediol.

Further, in the facial cleanser, the content of the component (E) is preferably 1/16 or more of the content of the component (A).

According to the present invention, component (A) an amino acid-based anionic surfactant, component (B) fatty acid potassium salt, component (C) a sulfobetaine type amphoteric surfactant, and component (D) water in a predetermined ratio. By containing it, the viscosity can be adjusted to provide a suitable feeling when used as a facial cleanser depending on the dosage form.

Hereinafter, a facial cleanser according to an embodiment of the present invention will be specifically described. The facial cleanser according to this embodiment contains the following components.
Component (A) Amino acid-based anionic surfactant Component (B) Fatty acid potassium salt Component (C) Sulfobetaine type amphoteric surfactant Component (D) Water Component (E) Glycol ether, glyceryl alkyl ether or alkanediol

Anionic surfactants are used as the main ingredient in body cleansers, including facial cleansers.Historically, they have been divided into soap-based surfactants, higher alcohol-based surfactants, and amino acid-based surfactants. Development is proceeding step by step, with the aim of improving the usability and making it less irritating. Amino acid-based surfactants are made by reacting amino acids with higher fatty acids, and have improved properties than previous higher alcohol-based surfactants in terms of both usability and hypoallergenicity. .

The amino acid-based anionic surfactant of component (A) of the present embodiment is preferably, for example, N-acylamino acids and salts thereof, and particularly preferably N-acylglycine, N-acylalanine, and salts thereof. Further, the acyl group preferably has 4 to 22 carbon atoms, more preferably 14 to 18 carbon atoms. Specifically, it is derived from lauric acid, myristic acid, palmitic acid, stearic acid, 2-ethylhexanoic acid, coconut oil fatty acid, oleic acid, castor oil fatty acid, olive oil fatty acid, palm oil fatty acid, and mixed fatty acids containing these. Examples include acyl groups. The base components constituting the salt of N-acylamino acid include alkali metals such as sodium and potassium, alkaline earth metals such as magnesium and calcium, organic amines such as monoethanolamine, diethanolamine, and triethanolamine, lysine, ornithine, Examples include basic amino acids such as arginine.

Specifically, N-coconut oil fatty acid acylglycine potassium (cocoylglycine potassium), N-coconut oil fatty acid acylglycine sodium (cocoylglycine sodium), N-coconut oil fatty acid acylglycine triethanolamine (cocoylglycine triethanolamine) , N-coconut oil fatty acid acylalanine potassium (cocoylalanine potassium), N-coconut oil fatty acid acylalanine sodium (cocoylalanine sodium), N-coconut oil fatty acid acylalanine triethanolamine (cocoylalanine triethanolamine),
Potassium N-coconut oil fatty acid acylglutamate (potassium cocoyl glutamate), sodium N-coconut oil fatty acid acylglutamate (sodium cocoyl glutamate), and triethanolamine of N-coconut oil fatty acid acylglutamate (triethanolamine cocoyl glutamate), In particular, N-coconut oil fatty acid acylglycine salts are preferred.

The amino acid-based anionic surfactant (component (A)) is contained, for example, in an amount of 0.1 to 20% by mass, preferably 4 to 20% by mass, based on the total amount of the facial cleanser, and is contained in an amount of 4 to 20% by mass, based on the total amount of the facial cleanser. Component (D)) is contained complementary thereto. The amino acid-based anionic surfactant is preferably contained in an amount of 4% by mass or more, since the anionic surfactant is a component that plays a major role as a detergent.

The fatty acid potassium salt of component (B) of the present embodiment includes, for example, potassium laurate, potassium myristate, potassium palmitate, potassium stearate, potassium coconut fatty acid, potassium oleate, potassium isostearate, potassium olive fatty acid, camelia Potassium oil fatty acids, potassium safflower fatty acids, potassium shea fatty acids, potassium camellia fatty acids, potassium palm kernel fatty acids, potassium palm fatty acids, potassium castor oil fatty acids, potassium behenate, potassium jojoba oil fatty acids, potassium macadamia seed oil fatty acids, potassium lanolin fatty acids , potassium linoleate, hydrogenated potassium coconut fatty acid, potassium beef tallow fatty acid, etc., and potassium coconut fatty acid is particularly preferred. Coconut fatty acid potassium is a potash soap made from coconut oil and potassium, and is a so-called pure soap ingredient, but it has excellent cleaning power due to its high water solubility and high foaming power.

The fatty acid potassium salt (component (B)) is contained, for example, in an amount of 0.01 to 10% by mass, preferably 0.1 to 5% by mass, based on the total amount of the facial cleanser. Further, the content of the fatty acid potassium salt (component (B)) is 1/8 or more of the content of the amino acid-based anionic surfactant (component (A)). However, if there is a large amount of fatty acid potassium salt, the skin irritation of the facial cleanser will be strong, so its content should not exceed the content of the amino acid-based anionic surfactant; About 1/2 of that is preferable.

Amphoteric surfactants are surfactants that have both an anionic group and a cationic group in the hydrophilic group in their molecules, and are generally cationic surfactants in acidic solutions and anionic surfactants in alkaline solutions. Active agent, exhibiting the properties of an amphoteric surfactant in neutral solution. Ampholytic surfactants mainly include amino acid type and betaine type, and betaine type further includes aminoacetic acid betaine type and sulfobetaine type, but component (C) of this embodiment is a sulfobetaine type amphoteric surfactant. It is a drug. These include, for example, coconut oil fatty acid dimethylsulfopropyl betaine, lauryldimethylaminohydroxysulfobetaine, laurylhydroxysulfobetaine (lauryl hydroxysulfobetaine), erucamidopropylhydroxysulfobetaine, cocamidopropylhydroxysulfobetaine, lauramidepropyl Examples include hydroxysulfobetaine.

The betaine type amphoteric surfactant (component (C)) is contained, for example, in an amount of 0.1 to 20% by weight, preferably in an amount of 1 to 10% by weight, based on the total amount of the facial cleanser. The content of the betaine type amphoteric surfactant (component (C)) is 1/2 or more of the content of the amino acid-based anionic surfactant (component (A)). Note that since the betaine type amphoteric surfactant has weak skin irritation, its content may exceed the content of the amino acid-based anionic surfactant as a facial cleanser.

Sulfobetaine-type amphoteric surfactants have detergency and foaming properties by themselves, but when used in combination with anionic surfactants, the detergency increases and creates a fine-textured, creamy foam. It is known that foam stability is improved. In addition, fatty acid potassium salts and sulfobetaine-type amphoteric surfactants have good compatibility as detergents, and sulfobetaine-type amphoteric surfactants not only improve foaming but also improve the stability of fatty acid potassium salts. play a role.

Examples of water as component (C) of this embodiment include tap water, ion exchange water, distilled water, purified water, and natural water, and sterilized water is preferable.

Component (E) of this embodiment is a glycol ether, glyceryl alkyl ether, or alkanediol, and these are materials that are generally added as preservatives in facial cleansers. As the glycol ether, for example, phenoxyethanol, phenoxyisopropanol, phenoxypropanediol, etc. are used. Examples of the glyceryl alkyl ether include 1-hexylglyceryl ether, 1-heptylglyceryl ether, 1-octylglyceryl ether, 1-decylglyceryl ether, 1-dodecylglyceryl ether, and 1-(2-ethylhexyl)glyceryl ether (ethylhexylglycerin). ) etc. are used. The alkanediol is preferably 1,2-alkanediol, such as 1,2-pentanediol, 1,2-hexanediol, 1,2-heptanediol, 1,2-octanediol (caprylyl glycol), 1, Examples include 2-nonanediol and 1,2-decanediol.

<Tests 1-4>
The viscosity of the resulting facial cleanser can be adjusted by changing the content of potassium cocoylglycine (component (A)), potassium coconut fatty acid (component (B)), and lauryl hydroxysultaine (component (C)). The results are shown in Table 1 below. In addition to water (component (D)), phenoxyethanol was added as component (E) to the above three components. The numerical value of the content of each component in the table is shown in mass %. Further, the viscosity was measured using a Brookfield viscometer, and herein, those with a viscosity of 200 mPa·S or more were taken as examples, and those with no viscosity were taken as comparative examples.

In Tests 1A to 1C, the contents of components (A) and (B) were kept constant, and only the content of component (C) was changed. In Tests 2A to 2C, the content of components (A) and (B) was half that of Tests 1A to 1C. In Tests 3A to 3C, component (B) was not added. In Tests 4A to 4C, the content of components (A) and (C) was kept constant, and the content of component (B) was varied.

As shown in Table 1, in Tests 1A, 2A, and 3A, no viscosity was observed because component (C) was not blended. Further, in Tests 3A to 3C, no viscosity was observed because component (B) was not blended. These results showed that no viscosity was produced when either component (B) or (C) was not added.

Further, Tests 1B and 2B showed that 3% by mass of component (C) did not give rise to viscosity, and that a higher content was required. This result shows that the content of component (C) should be 1/2 or more of the content of component (A).

Moreover, Test 4A showed that if component (B) was blended in an amount of 1% by mass or more, viscosity increased. This result shows that the content of component (B) should be at least ⅛ of the content of component (A).

In addition, from Tests 4A, 4B, 4C, and 1C, if the content of components (A) and (C) is constant, the higher the content of component (B), the higher the viscosity. The content of component (B) in Test 1C is 3 times that of Test 4A, but the viscosity is 6 times, and the content of component (B) in Test 1C is 4 times that of Test 4A, but the viscosity is 13 It's doubled. From this, it can be seen that component (B) has a greater effect of increasing the viscosity than the content ratio with respect to components (A) and (C). In addition, from Tests 2C and 4B, the viscosity increases as the content of component (A) decreases compared to the content of component (C), so component (A) does not contribute to the viscosity, and component It is thought that the ratio of (B) and (C) influences the viscosity. From the above results, it can be seen that the content of component (B) is preferably 1/2 or more of component (C).

As described above, according to the present embodiment, component (A) is an amino acid-based anionic surfactant, component (B) is a fatty acid potassium salt, component (C) is a sulfobetaine type amphoteric surfactant, and component (D) is a fatty acid potassium salt. By containing water in a predetermined proportion, the viscosity becomes 200 mPa·S or more, and the viscosity can be adjusted to a level that provides an appropriate feeling of use as a facial cleanser depending on the dosage form. Although the viscosity is 200 mPa・S as an example here, the typical viscosity for facial cleansers is 500 mPa・S or more. It is considered to be S.

<Test 5>
Next, after keeping the contents of cocoylglycine potassium (component (A)), coconut fatty acid potassium (component (B)), and lauryl hydroxysultaine (component (C)) constant, the pH of the facial cleanser was adjusted to that level. The effect on appearance was tested and the results are shown in Table 2 below. Note that the pH was adjusted by appropriately adding citric acid.

As shown in Table 2, the facial cleanser composed of the above components became slightly cloudy at pH 7 (Test 5C) and became cloudy at pH 6.5 (Test 5D) in a 5° C. environment. In addition, at room temperature, it became slightly cloudy at pH 6.5 (Test 5D). From the above results, it can be seen that the pH of the facial cleanser composed of the above components is preferably 7 or higher. Furthermore, since it is a facial cleanser, it is not preferable that it be excessively alkaline, and a pH of 7 to 10 is preferable.

<Tests 6-9>
Next, after keeping the contents of cocoylglycine potassium (component (A)), coconut fatty acid potassium (component (B)), and lauryl hydroxysultaine (component (C)) constant, phenoxyethanol was added as component (E). , ethylhexylglycerin, or caprylyl glycol was tested to see how the viscosity of the resulting facial cleanser would change, and the results are shown in Table 3 below. In addition, in Table 3 below, examples are those containing component (E), those without component (E), and those containing sodium benzoate, which is known as a general preservative. was used as a comparative example.

In Tests 6A to 6C, phenoxyethanol was used as component (E), and its content was varied in three stages: 0, 0.5% by mass, and 1% by mass. Similarly, ethylhexylglycerin was used in Tests 7A-7C, caprylyl glycol was used in Tests 8A-8C, and sodium benzoate was used in Tests 9A-9C.

From Tests 6A, 7A, and 8A, a constant viscosity is obtained even without component (E), but from Tests 6B, 6C, 7B, 7C, 8B, and 8C, as the content of component (E) increases, the viscosity increases. was shown to be higher. Furthermore, it was shown that a very high thickening effect can be obtained by adding 0.5% by mass of both. These results show that the content of component (E) should be at least 1/16 of component (A). It was also shown that ethylhexylglycerin has a particularly high thickening effect.

Further, in Tests 9A to 9C in which sodium benzoate was added as a comparative example, the viscosity decreased as the content of sodium benzoate increased. Here, the solubility of sodium benzoate used in the comparative example in water is about 62.5 g/100 g. On the other hand, the solubility of phenoxyethanol used in Examples in water is about 2.6 g/100 g, the solubility of ethylhexylglycerin is about 0.1 g/100 g, and the solubility of caprylyl glycol is about 0.75 g/100 g. That is, it is presumed that alcohol/ether materials with low solubility exhibit a thickening effect when added to facial cleansers made of amino acid-based anionic surfactants.

The cleaning composition of the present embodiment may contain any other components as appropriate, in addition to the above-mentioned components, within a range that does not impair the effects of the invention. Examples of optional ingredients include humectants, herbal medicines, pH adjusters, chelating agents, preservatives, antioxidants, refreshing agents, vitamins, proteins, polymers, fragrances, antibacterial agents, thickeners, and pigments. It will be done. Specifically, examples of the polymer include polyquaternium-10, and examples of the chelating agent include disodium EDTA. Note that this does not negate the addition of a thickener to increase the viscosity by a method other than the combination of surfactants, and for example, a thickener such as polyethylene glycol distearate may be used. Moreover, preservatives other than the above-mentioned component (E) may be added as appropriate.

Note that the facial cleanser according to the present invention is not limited to the above embodiments, and various modifications can be made. In the above examples, only one type of component (E) was used in order to examine the thickening effect, but a plurality of types of component (E) may be mixed. In addition, the present invention is intended to be applied to facial cleansers that are particularly required to be irritating to the skin. Needless to say, it can be used in all body wash compositions containing surfactants.

Claims (7)

A facial cleanser containing component (A) amino acid-based anionic surfactant, component (B) fatty acid potassium salt, component (C) sulfobetaine type amphoteric surfactant, and component (D) water and having a viscosity of 200 mPa·S or more. The facial cleanser according to claim 1, which has a pH of 7 to 10. The facial cleanser according to claim 1 or 2, wherein the content of the component (C) is 1/2 or more of the content of the component (A). The facial cleanser according to any one of claims 1 to 3, wherein the content of the component (B) is ⅛ or more of the content of the component (A). The facial cleanser according to any one of claims 1 to 4, wherein the content of the component (B) is 1/2 or more of the content of the component (C). The body cleansing composition according to any one of claims 1 to 5, further comprising component (E) glycol ether, glyceryl alkyl ether, or alkanediol. The facial cleanser according to claim 6, wherein the content of the component (E) is 1/16 or more of the content of the component (A).