Solid skin cleansing composition

Abstract

To provide a skin cleansing composition that removes odor components and the components responsible therefor and exhibits excellent deodorizing effect in an effective, continuous manner.SOLUTION: A solid skin cleansing composition contains following components (A) and (B): (A) an anionic surfactant and (B) an amine 1.2 mass% or more.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to a solid skin cleansing composition. [Background technology]

[0002] 2. Description of the Related Art External skin preparations that are applied to the skin but do not wash off and that contain a deodorant component are known (for example, Patent Document 1 and Patent Document 2). However, these agents do not wash away from the skin the odorous components that cause body odor (short-chain fatty acids: isovaleric acid, butyric acid) or the components that are the source of odorous components (palmitic acid, oleic acid, leucine, which are precursors of short-chain fatty acids). If the skin is washed separately, the above-mentioned deodorizing components also easily disappear from the skin, so it was not possible to expect a sustained odor suppression effect that includes skin washing. On the other hand, a skin cleansing composition that is of the wash-off type and contains a bactericide or the like as a deodorizing component is known (Patent Document 3). In this skin cleansing composition, the main component that actually removes odorous components and components that cause odors is a surfactant, etc., so the deodorizing component is easily washed away from the skin during skin cleansing, and the deodorizing effect is not fully exerted. Furthermore, the deodorizing component cannot be expected to have a sustained odor suppression effect. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2014-105186 A [Patent Document 2] JP 2016-216516 A [Patent Document 3] International Publication No. 2016 / 093089 Summary of the Invention [Problem to be solved by the invention]

[0004] The present invention relates to a skin cleansing composition that effectively and sustainably provides an excellent deodorizing effect. [Means for solving the problem]

[0005] The inventors have discovered that a solid skin cleansing composition combining an anionic surfactant and amines has the effect of removing odorous components and the source of odorous components through both the anionic surfactant and the amines during cleansing, and that after cleansing, the amines remaining on the skin inhibit the metabolism of bacteria, suppressing the generation of odor, and also neutralizing and deodorizing the odorous components (produced by bacteria), thereby providing a sustained deodorizing effect, thereby completing the present invention.

[0006] The present invention comprises the following components (A) and (B): (A) an anionic surfactant, (B) Amines: 1.2% by mass or more The present invention relates to a solid skin cleansing composition comprising the above compound. The present invention also relates to a composition comprising the following components (A) and (B): (A) an anionic surfactant, (B) Amines A method for cleansing skin, comprising dissolving a solid composition comprising the formula: in water, applying the composition to the skin, and then rinsing the composition off, The present invention relates to a method for cleansing the skin, which deodorizes the skin by using a component (B) that remains on the skin after washing. Effect of the Invention

[0007] The solid skin cleansing composition of the present invention is mild to the skin without causing a tight feeling after cleansing, and can effectively and sustainably obtain an excellent deodorizing effect with normal cleansing action due to the removal of odorous components and odor-causing components by surfactants and amines, and the sustained deodorizing effect by the remaining amines. It also has good storage stability.

[0008] In the present invention, both the anionic surfactant and the amines remove odorous components and the source of odorous components during washing. The amines function as bases and neutralize the acidic odorous components, solubilizing them in water and making them easier to remove from the skin. After washing, the amines remaining on the skin inhibit the metabolism of bacteria, suppressing the generation of odor and neutralizing the odorous components (produced by bacteria), thus providing a long-lasting deodorizing effect. In this way, the anionic surfactant and amines remove the odorous components and the components that cause the odor, and the remaining amines have a deodorizing effect, resulting in a strong and long-lasting deodorizing effect. Therefore, you can effectively and continuously obtain excellent deodorizing effects by simply washing normally. Amines emit a specific odor (amine odor) when hydrolyzed. For example, in a liquid formulation, amines are easily hydrolyzed during storage at high temperatures, which can cause the generation of an amine odor. In an actual formulation, it is also necessary to prevent the deterioration of the amines contained in the formulation (odor deterioration that generates an amine odor) and to improve the storage stability of the formulation. Since the skin cleansing composition of the present invention is in a solid form, hydrolysis of amines is unlikely to occur, and the storage stability of the composition can be easily improved. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] The skin cleansing composition of the present invention is in a solid form and includes solid soap, powdery cleansing agent, and the like.

[0010] The anionic surfactant of component (A) used in the present invention may be any one that is commonly used in detergents, and examples thereof include fatty acid salts, acylamino acid salts, and sulfonate salts. The fatty acid salts are excluding neutralized salts of fatty acids and amines, and include neutralized salts of fatty acids and alkali metals such as sodium and potassium. The fatty acids constituting the fatty acid salts are preferably those having 12 to 24 carbon atoms, and more preferably saturated fatty acids having 12 to 20 carbon atoms. Examples include lauric acid, myristic acid, palmitic acid, stearic acid, isostearic acid, oleic acid, linoleic acid, and behenic acid. In addition, mixtures of coconut fatty acid, palm fatty acid, palm kernel fatty acid, and the like may also be used.

[0011] The amino acids constituting the acylamino acid salt include acidic amino acids such as glutamic acid and aspartic acid; neutral amino acids such as glycine, alanine, threonine, methylalanine, and sarcosine; and basic amino acids such as lysine and arginine. These amino acids may be L-, D-, or DL-forms. Among these, from the viewpoint of mildness to the skin, acidic amino acids and neutral amino acids are preferred, and it is more preferred to include one or more selected from glutamic acid, aspartic acid, and glycine.

[0012] The acyl group constituting the acylamino acid salt is preferably an acyl group derived from a saturated or unsaturated straight-chain or branched-chain fatty acid, and from the viewpoints of foaming ability, skin mildness, and easy availability, the number of carbon atoms is preferably 6 to 26, and more preferably 8 to 22. Specific examples of the fatty acid include caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid, stearic acid, isostearic acid, oleic acid, linoleic acid, and behenic acid. In addition, fatty acids derived from animals and plants, such as coconut fatty acid, palm fatty acid, and hardened beef tallow fatty acid, may also be used.

[0013] Examples of the salts of acylamino acids include inorganic salts such as alkali metal salts (e.g., sodium salt, potassium salt, etc.), alkaline earth metal salts (e.g., calcium salt, magnesium salt, etc.), aluminum salt, zinc salt, etc., ammonium salts, organic amine salts (e.g., monoethanolamine salt, diethanolamine salt, triethanolamine salt, etc.), and organic salts such as basic amino acid salts (e.g., arginine salt, lysine salt, etc.). Among these, sodium salts and potassium salts are preferred from the viewpoints of storage stability and availability.

[0014] Examples of sulfonates include sodium coconut oil fatty acid ethyl ester sulfonate, sodium tetradecene sulfonate, and the like.

[0015] From the viewpoint of facilitating solidification of the composition, component (A) is preferably a solid at 25°C. Examples of anionic surfactants that are solid at 25° C. include laurates, myristates, palmitates, stearates, sulfonates, glutamate, aspartate, glycine salts, and sarcosinate salts.

[0016] From the viewpoints of foaming ability, mildness to the skin, and availability, component (A) preferably contains one or more selected from laurate, myristate, palmitate, stearate, myristoyl glutamate, lauroyl glutamate, lauroyl aspartate, cocoyl glycine salt, and lauroyl sarcosine salt. As the salt, sodium salt and potassium salt are preferred, and sodium salt is more preferred.

[0017] Component (A) may be used alone or in combination of two or more, and the content is preferably 64% by mass or more, more preferably 68% by mass or more, and even more preferably 72% by mass or more in the total composition from the viewpoint of detergency. When the composition contains 1.2% or more of component (B) as described later, the content of component (A) is 98.8% by mass or less, preferably 98.4% by mass or less, and more preferably 97.5% by mass or less.

[0018] It is preferable that component (A) contains a fatty acid salt, because the stratum corneum is likely to swell when cleansed, water-soluble amines are likely to remain in and penetrate the swollen stratum corneum, and are likely to react with odorous components and the like that have permeated the stratum corneum. The content of the fatty acid salt in the composition is preferably 64% by mass or more, more preferably 68% by mass or more, and is preferably 98.8% by mass or less, more preferably 97% by mass or less. When the composition is to be made into a solid soap, from the viewpoints of keeping the content of amines below a certain level to obtain mildness on the skin by reducing the pH, while keeping the amount of water below a certain level to facilitate production (giving the composition a hardness that allows it to be easily compressed into a solid soap shape), the content of fatty acid salt in the composition is preferably 64% by mass or more, and more preferably 70% by mass or more. Furthermore, when the composition is to be made into a solid soap, from the viewpoints of obtaining a deodorizing effect by containing a certain amount of amines and facilitating production by blending a certain amount of water (giving the composition a hardness that allows it to be easily compressed into a solid soap shape), the content of fatty acid salts in the composition is preferably 88.3% by weight or less, and more preferably 85% by mass or less. When the composition is used as a powder cleanser, from the viewpoint of achieving skin mildness by reducing the pH by keeping the content of amines below a certain level, the content of fatty acid salts in the composition is preferably 82% by mass or more, and more preferably 88% by mass or more, and from the viewpoint of achieving a deodorizing effect by containing a certain amount of amines or more, the content is preferably 98.8% by mass or less, and more preferably 97% by mass or less.

[0019] Examples of the amines of component (B) include basic amino acids such as arginine, lysine, and histidine; trishydroxymethylaminomethane; and the like. Among these, basic amino acids have high affinity with the skin and have a higher effect of remaining on the skin and exerting a deodorizing effect (sustained deodorizing effect), and among basic amino acids, arginine is more preferable from the viewpoint of a sustained deodorizing effect. These amino acids may be any of L-, D-, and DL-isomers. Trishydroxymethylaminomethane combines with proteins to improve dispersibility in water, and therefore has a strong ability to cleanse keratin plugs and the like on the skin. From the viewpoint of obtaining a deodorizing effect, component (B) preferably contains one or more selected from arginine, lysine, histidine, and trishydroxymethylaminomethane, and from the viewpoint of storage stability of the composition, it is more preferable that component (B) contains one or more selected from lysine, histidine, and trishydroxymethylaminomethane.

[0020] From the viewpoint of facilitating the formation of a solid composition and from the viewpoint of ease of incorporation when the composition is made into a powder cleansing agent, it is preferable that component (B) is a solid at 25°C. Examples of amines that are solid at 25° C. include arginine, lysine, histidine, and trishydroxymethylaminomethane.

[0021] One or more kinds of component (B) can be used, and the content is 1.2% by mass or more in the total composition, preferably 1.6% by mass or more, and more preferably 2.5% by mass or more, from the viewpoint that the amines remain in the stratum corneum of the skin even after the composition is washed off to exert a deodorizing effect (sustained deodorizing effect). When the composition contains a component (fatty acid, etc.) that forms a neutralized salt with the amines, it is preferable to adjust the content of the amines, etc. in the composition so that the amines that are not neutralized by this component are 1.2% by mass or more. In addition, the content of component (B) is preferably 19% by mass or less, more preferably 15% by mass or less, and even more preferably 11% by mass or less, from the viewpoint of reducing the pH of the composition when dissolved in water and improving skin mildness. When the composition is to be made into a solid soap, the content of component (B) is preferably 19% by mass or less, more preferably 15% by mass or less, and even more preferably 11% by mass or less, from the viewpoint of storage stability. When the composition is to be made into a solid soap using component (B) as a powder raw material, by suppressing the content of component (B), the composition can be easily compressed into a solid soap shape, and production becomes easier. From this viewpoint, the content of component (B) is preferably 18% by mass or less, more preferably 16% by mass or less.

[0022] In the present invention, the mass ratio (B) / (A) of component (B) to component (A) is preferably 0.01 or more, more preferably 0.015 or more, and even more preferably 0.02 or more, from the viewpoint of sustained deodorizing effect, and is preferably 0.28 or less, more preferably 0.18 or less, and even more preferably 0.08 or less, from the viewpoint of skin mildness, and is preferably 0.28 or less, more preferably 0.2 or less, and even more preferably 0.16 or less, from the viewpoint of storage stability.

[0023] The skin cleansing composition of the present invention may contain (C) water. When the composition is to be a solid soap, the inclusion of (C) water makes it easy to bond the fatty acid salts together, facilitating production. From the viewpoint of providing the composition with a hardness that allows it to be easily compressed into a solid soap shape and facilitating production, the water content of component (C) is preferably 10.5% by mass or more of the total composition, more preferably 10.7% by mass or more, and even more preferably 10.9% by mass or more, and is preferably 19% by mass or less, more preferably 17% by mass or less, and even more preferably 15% by mass or less.

[0024] In the present invention, when the composition is made into a solid soap, the mass ratio (B) / (C) of component (B) to component (C) is preferably 0.05 or more, more preferably 0.1 or more, and even more preferably 0.2 or more, from the viewpoint of sustained deodorizing effect, and is preferably 1.7 or less, more preferably 1.5 or less, and even more preferably 1.3 or less, from the viewpoint of ease of production and improved storage stability.

[0025] The skin cleansing composition of the present invention may further contain (D) an unneutralized fatty acid. When the composition is made into a bar soap, the fatty acid can improve mildness and foaming, and when the composition is made into a powder detergent, the fatty acid can function as an emollient. The fatty acid is preferably one having 12 to 24 carbon atoms, more preferably a saturated fatty acid having 12 to 20 carbon atoms. Examples include caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid, stearic acid, isostearic acid, oleic acid, linoleic acid, behenic acid, etc. Also, a mixture of coconut fatty acid, palm fatty acid, palm kernel fatty acid, etc. may be used. Of these, lauric acid, myristic acid, palmitic acid, stearic acid, oleic acid, and linoleic acid are preferred from the standpoints of foaming ability, mildness to the skin, and ready availability.

[0026] Component (D) may be used alone or in combination with two or more types. From the viewpoints of foaming ability and mildness to the skin, the content is preferably 0.7% by mass or more of the total composition, more preferably 1.5% by mass or more, and even more preferably 2.5% by mass or more. In the present invention, when component (D) is contained, a neutralized salt of component (D) and amines of component (B) may be formed. Even in this case, the content of components (D) and the like is adjusted so that the content of amines of component (B) not neutralized by component (D) is 1.2 mass% or more in the composition so that the composition contains an amount of amines sufficient to exhibit a sustained deodorizing effect. From this viewpoint, the content of component (D) in the entire composition is preferably 10 mass% or less, more preferably 7 mass% or less. From the viewpoint of sustained deodorizing effect, the content of component (B) not neutralized by component (D) is preferably 1.6 mass% or more in the composition, more preferably 2.5 mass% or more.

[0027] In addition to the above-mentioned components, the skin cleansing composition of the present invention may contain components used in conventional skin cleansing agents, such as surfactants other than component (A), polymeric compounds, polyols, oily components, bactericides, anti-inflammatory agents, preservatives, fragrances, colorants, ultraviolet absorbers, antioxidants, plant extracts, etc.

[0028] The surfactant other than component (A) may be a nonionic surfactant. In addition, by including a fragrance, the amine odor originating from the amines in the composition can be masked. In this case, it is preferable that the fragrance component does not react with the amines. Examples of such fragrance components include fragrance components other than carboxylic acids. Furthermore, by including a colorant, not only can the composition be colored, but also discoloration (e.g., yellowing) of the product caused by amines can be covered. Examples of such colorants include iron oxide and titanium oxide.

[0029] The skin cleansing composition of the present invention is in a solid form and can be in the form of a solid soap, a powdery cleanser, or the like. When it is made into a solid soap, it can be produced by a conventional method. For example, it can be produced by kneading components (A), (B), water, and other components as necessary. Usually, this kneaded mixture (neat soap) is extruded into a rod shape using an extruder, and then stamped into a mold to process it into the shape of a so-called solid soap, which can then be used. When a powdered cleansing agent is used, it can be produced by mixing the respective components.

[0030] From the viewpoint of improving skin mildness, the skin cleansing composition of the present invention preferably has a pH of a 1% by mass aqueous solution of the composition at 25°C of 10.9 or less, more preferably 10.7 or less, even more preferably 10.6 or less, preferably 4 or more, more preferably 5 or more, and even more preferably 6 or more. In the present invention, the pH is measured by a pH meter (for example, model F-22, manufactured by Horiba, Ltd.).

[0031] The skin cleansing composition of the present invention is suitable for deodorizing skin because it can effectively and sustainably provide excellent deodorizing effects with normal washing actions due to the removal of odorous components and components that cause odorous components by the anionic surfactant and amines, and the deodorizing effect of the remaining amines.

[0032] The present invention also relates to a composition comprising components (A) and (B): (A) an anionic surfactant, (B) Amines A method for cleansing skin, comprising dissolving a solid composition comprising the formula: in water, applying the composition to the skin, and then rinsing the composition off, This is a method for cleansing the skin, which can deodorize the skin by the component (B) remaining on the skin after washing. EXAMPLES

[0033] Examples 1 to 19 and Comparative Example 1 (Soap Bar) A skin cleansing composition (solid soap) having the composition shown in Table 1 was prepared. The obtained skin cleansing composition was measured for pH and evaluated for sustained deodorizing effect, mildness to skin, manufacturability, and storage stability. The results are shown in Table 1.

[0034] (Manufacturing method) A skin cleansing composition (solid soap) was produced by kneading sodium fatty acid, amines, water, and, if necessary, fatty acid, and extruding the kneaded mixture (neat soap) into a rod shape using an extruder and stamping it into a mold.

[0035] (Evaluation method) (1)pH measurement: A 1% by mass aqueous solution of each composition was prepared, and the pH was measured at 25° C. using a pH meter (manufactured by Horiba, Ltd., model number F-22).

[0036] (2) Long-lasting deodorizing effect: The evaluation was carried out by five expert panelists. For the solid soap, the solid soap was foamed while adding water as needed, and for the powder detergent, 1 g of the sample was taken in the hand and foamed while adding water as needed. The resulting foam was used to wash the entire foot from the ankle down for 30 seconds, rinsed with tap water, and then wiped with a towel. The foot odor 24 hours after wiping with a towel was evaluated according to the following criteria, and the average value was calculated. <Evaluation criteria> 0: No smell at all. 1: Very faint odor is detected. 2: A faint odor is detected. 3: There is a clear smell. 4: There is a clearly strong odor. 5: There is clearly a very strong odor.

[0037] (3) Mild on the skin: The evaluation was carried out by five expert panelists. For the bar soap, water was added to the bar soap to create a lather, and for the powder detergent, 1 g of the sample was taken in the hand and lathered while adding water. The resulting lather was used to wash the entire foot from the ankle down for 30 seconds, rinsed with tap water, and then wiped with a towel. The skin feel after wiping with a towel was evaluated according to the following criteria, and the average value was calculated. <Evaluation criteria> 0: No tightness on the skin at all. 1: Very slight feeling of tightness on the skin. 2: Sensitive skin feels tight. 3: The skin feels tight and dry. 4: The skin feels very tight and very dry.

[0038] (4) Manufacturability: In producing the solid soap, fatty acid Na, amines, water, and, if necessary, fatty acid were added and kneaded. The kneaded composition was compressed by a plotter to form a solid soap shape, and the manufacturability was evaluated according to the following criteria. ◯: The composition can be formed into a soap bar shape. Δ: Although it takes time, the composition can be formed into a soap bar shape. ×: The composition cannot be formed into a soap bar shape.

[0039] (5) Storage stability: The evaluation was carried out by five expert panelists. Each composition was stored at 50° C. for one month, and then the composition was whipped into a foam. The odor of the foam was evaluated according to the following criteria, and the average value was calculated. <Evaluation criteria> 0: No amine odor is detected at all. 1: A very weak amine odor is detected. 2: A weak amine odor is detected. 3: A clear amine odor is detected. 4: A strong amine odor is clearly detected. 5: A very strong amine odor is clearly detected.

[0040] [Table 1]

[0041] Examples 20 to 31 and Comparative Example 2 (Powder Cleanser) A powdered cleanser having the composition shown in Table 2 was produced by mixing the components. For the obtained powdery cleansing agent, the pH was measured and the sustained deodorizing effect, skin mildness, and storage stability were evaluated in the same manner as in Examples 1 to 19. The results are shown in Table 2.

[0042] [Table 2]

Claims

1. The following components (A), (B) and (C): (A) an anionic surfactant selected from fatty acid salts, acylamino acid salts, and sulfonate salts; (B) amines selected from basic amino acids and tris(hydroxymethyl)aminomethane: 1.2% by mass or more; (C) Water 10.7-19% by mass wherein the mass ratio (B) / (A) of component (B) to component (A) is 0.01 to 0.

28.

2. 2. The skin cleansing composition according to claim 1, wherein component (A) is a solid at 25°C.

3. 3. The skin cleansing composition according to claim 1, wherein the component (B) comprises one or more members selected from the group consisting of arginine, lysine, histidine and trishydroxymethylaminomethane.

4. The skin cleansing composition according to any one of claims 1 to 3, wherein component (B) is a solid at 25°C.

5. The skin cleansing composition according to any one of claims 1 to 4, wherein the content of component (B) is 19 mass% or less.

6. 6. The skin cleansing composition according to any one of claims 1 to 5, wherein component (A) comprises one or more selected from the group consisting of laurate, myristate, palmitate, stearate, myristoyl glutamate, lauroyl glutamate, lauroyl aspartate, cocoyl glycine salt, and lauroyl sarcosine salt.

7. 7. The skin cleansing composition according to claim 1, wherein the mass ratio (B) / (C) of component (B) to component (C) is 0.05 to 1.

7.

8. The skin cleansing composition according to any one of claims 1 to 7, further comprising (D) a fatty acid.

9. 9. The skin cleansing composition according to claim 8, wherein the content of the amines of component (B) that are not neutralized with component (D) in the composition is 1.2% by mass or more.

10. The skin cleansing composition according to any one of claims 1 to 9, wherein a pH of a 1% by mass aqueous solution at 25°C is 10.9 or less.

11. The skin cleansing composition according to any one of claims 1 to 10, which is a solid soap.

12. The skin cleansing composition according to any one of claims 1 to 11, which is used for deodorizing skin.

13. The following components (A), (B) and (C): (A) an anionic surfactant selected from fatty acid salts, acylamino acid salts, and sulfonate salts; (B) amines selected from basic amino acids and tris(hydroxymethyl)aminomethane: 1.2% by mass or more; (C) Water 10.7-19% by mass wherein the mass ratio (B) / (A) of component (B) to component (A) is 0.01 to 0.28, and the solid composition is dissolved in water, applied to the skin, and then washed off, This method for cleansing the skin deodorizes the skin with the component (B) remaining on the skin after washing.

Images