Cleansing cosmetics

Abstract

To provide cleansing cosmetics that are excellent in the resilience and continuation of foam without impairing stability or usability and are also excellent in safety.SOLUTION: Cleansing cosmetics contain components (A)-(D): (A) 0.1-0.8 mass% of synthetic hectorite, (B) 0.0005-0.5 mass% of cationic polymer, (C) 5.0-50.0 mass% of fatty acid soap, and (D) 0.1-1.0 mass% of hydrogenated castor oil.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to a cleansing cosmetic composition, and more specifically, to a cleansing cosmetic composition which contains a specific component and thereby has excellent foam elasticity and foam durability without impairing stability and usability, and further has excellent safety. [Background technology]

[0002] Cleansing cosmetics are used to remove dirt from the skin and keep the skin healthy. Cleansing cosmetics, whose main components are soap or weakly acidic to neutral surfactants, are usually used to remove dirt, but there has been a demand for improved foam fineness, foam elasticity, and foam durability to make use of them more comfortable. When washing with foam with excellent elasticity, the touch of the fingers on the skin is reduced, and a gentler wash can be achieved without a sense of friction. However, if the foam durability is poor, the foam will defoam during washing, making the skin feel uncomfortable and losing a comfortable feel when used. From this perspective, there is a constant demand for technology to improve foam elasticity and foam durability.

[0003] In general, it is known that a cationic polymer or surfactant is blended as a means for improving foam elasticity and foam durability (Patent Documents 1 to 3). However, although the foam elasticity and foam durability that are highly satisfactory can be obtained by using these ingredients, the foam feels slippery during use, which increases discomfort. Furthermore, the foam may become stringy when taken out of the container, which causes problems with usability. In addition, the blending of a high amount of surfactant raises concerns about skin irritation, and may even cause problems such as eye stinging during face washing.

[0004] It has also been disclosed that the stabilization and cleaning properties of gel formulations can be improved by combining water-swelling clay minerals with cleaning ingredients (Patent Documents 4-5). Water-swelling clay minerals refer to synthetic or natural smectites, particularly hectorite, laponite, and montmorillonite. Patent Document 4 describes a gel-type cleaning agent for cleaning human skin and hair, which contains 3-15% by mass of water-swelling clay minerals, water, and 10-40% by mass of an anionic surfactant. Patent Document 5 describes a cleaning agent consisting of 25-50% by mass of water-swelling clay minerals, 8-25% by mass of an anionic surfactant, and 25-65% by mass of water. These cleaning agents have improved formulation stability and moisturizing feeling after use, but the foam elasticity and foam quality during cleaning were not satisfactory. Furthermore, Patent Document 6 discloses a technology for improving the stability of a cleaning agent containing a high amount of alcohol by combining a water-swellable clay mineral and a cationic component. However, this document does not mention foam quality, and in fact this combination was not satisfactory in terms of foam elasticity and foam quality during cleaning.

[0005] The present inventors focused on soap-based components using soap as a cleaning component. It is generally known that when a soap-based cleaning component is used, the foaming is good and the formulation becomes a very thick cream. However, soap-based cleaning agents have an alkaline pH, and under such conditions, when a water-swelling clay mineral or a cationic component is added, the viscosity of the formulation further increases, which causes problems in usability and stability.

[0006] Given these circumstances, conventional technology has not been able to achieve a cleansing cosmetic product that has high usability, foam elasticity, and foam quality while resolving the issues, particularly in soap-based cleansers. There was an urgent need to solve these issues in order to develop a cleansing cosmetic product that has excellent foam elasticity and foam durability, is comfortable to use, and is safe to use. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] JP 2007-269704 A [Patent Document 2] JP 2014-181223 A [Patent Document 3] JP 2015-189674 A [Patent Document 4] JP 2007-254432 A [Patent Document 5] JP 2009-167126 A [Patent Document 6] JP 2017-048157 A Summary of the Invention [Problem to be solved by the invention]

[0008] 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 cosmetic composition which is a soap-based cleanser that has excellent foam elasticity and foam durability without compromising stability and usability, and is also excellent in safety. [Means for solving the problem]

[0009] In order to achieve the above object, the present inventors have conducted extensive research and have found that The following components (A) to (D) (A) Synthetic hectorite 0.1% to 0.8% by mass (B) Cationic polymer 0.0005% by mass to 0.5% by mass (C) Fatty acid soap 5.0% by mass to 50.0% by mass (D) Hydrogenated castor oil 0.1% by mass to 1.0% by mass The present invention has been completed based on the discovery that the above-mentioned problems can be solved by providing a cleansing cosmetic composition comprising the above-mentioned component (I). Effect of the Invention

[0010] According to the present invention, it is possible to provide a cleansing cosmetic composition which has excellent foam elasticity and foam durability without compromising stability and usability, and further has excellent safety. BEST MODE FOR CARRYING OUT THEINVENTION

[0011] The present invention will be described in more detail below. Unless otherwise noted, the amount of each component expressed as "%" below means % by mass.

[0012] The component (A) synthetic hectorite used in the present invention is a type of synthetic smectite. These have the property of providing viscosity when mixed with water, and are characterized by having fewer impurities and smaller particles than natural smectite. Such synthetic hectorite is not particularly limited as long as it is a synthetic clay mineral generally used in cosmetics, but specifically, synthetic hectorite such as silicic acid (Li / Mg / Na) or silicic acid (Na / Mg), and particularly preferably silicic acid (Na / Mg), is desirable. By blending this component and using it in combination with other components described in the claims, foam elasticity and foam durability are particularly improved. These components (A) may be used alone or in appropriate combination of two or more.

[0013] The blending amount of the component (A) synthetic hectorite used in the present invention is 0.1% to 0.8% by mass in the cleansing cosmetic composition, and more preferably 0.3% to 0.6% by mass. This range can solve problems such as foam elasticity, foam persistence, formulation stability, and usability.

[0014] The component (B) cationic polymer is not particularly limited, but is a natural or synthetic polymer having a cationic functional group in the molecule. Specific examples include cationic cellulose, cationic starch, cationic xanthan gum, diallyl quaternary ammonium salt / acrylamide copolymer, vinylimidazolium trichloride / vinylpyrrolidone copolymer, hydroxyethyl cellulose / dimethyl diallyl ammonium chloride copolymer, vinylpyrrolidone / quaternary dimethylaminoethyl methacrylate copolymer, vinylpyrrolidone / alkylaminoacrylate copolymer, vinylpyrrolidone / alkylaminoacrylate / vinylcaprolactam copolymer, vinylpyrrolidone / methacrylamidopropyl trimethylammonium chloride copolymer, alkylacrylamide / acrylate / alkylaminoalkylacrylamide / polyethylene glycol copolymer, and the like. Chole methacrylate copolymer, adipic acid / dimethylamino hydroxypropyl ethylenetriamine copolymer, cationized fenugreek gum, cationized guar gum, cationized tara gum, cationized locust bean gum, acrylic acid / methacrylamidopropyltrimethylammonium chloride / acrylamide copolymer, polyquaternium-4, polyquaternium-7, polyquaternium-10, polyquaternium-39, polyquaternium-47, polyquaternium-51, polyquaternium-52, polyquaternium-61, polyquaternium-64, polyquaternium-65, and guar hydroxypropyltrimonium chloride, hydroxypropyltrimonium hyaluronate. Particularly preferred are polyquaternium-7, polyquaternium-39, polyquaternium-47, polyquaternium-10, and hydroxypropyltrimonium hyaluronate, and more preferred are polyquaternium-7 and hydroxypropyltrimonium hyaluronate. These (B) components may be used alone or in combination of two or more.

[0015] The amount of the cationic polymer (B) used in the present invention is 0.0005% by mass to 0.5% by mass, and more preferably 0.001% by mass to 0.5% by mass. Within this range, problems such as foam elasticity, foam durability, stability in the formulation, and safety can be solved.

[0016] Component (C) fatty acid soap is not particularly limited, but refers to sodium salts of fatty acids and potassium salts of fatty acids. Specific fatty acids include caprylic acid, capric acid, lauric acid, myristic acid, pentadecylic acid, palmitic acid, palmitoleic acid, margaric acid, stearic acid, oleic acid, vaccenic acid, and linoleic acid, and are not particularly limited to straight chains or branched types of the above fatty acids, but preferably lauric acid, myristic acid, palmitic acid, isostearic acid, and stearic acid. From the viewpoints of foam elasticity, foam persistence, stability in formulations, and safety, fatty acid soaps of sodium salts or potassium salts of these are desirable. These (C) components may be used alone or in appropriate combinations of two or more.

[0017] The amount of the fatty acid soap (C) used in the present invention is 5.0% to 50.0% by mass, and preferably 8.0% to 40.0% by mass, in the cleansing cosmetic composition. By adding the fatty acid soap in this range, better foam elasticity and foam durability can be achieved.

[0018] The hydrogenated castor oil of component (D) used in the present invention is not particularly limited, but is a type of oil component that is used in the hope of improving the stability of the composition. The manufacturing method is also not particularly limited, but for example, it can be obtained by hydrogenating castor oil extracted from castor seeds.

[0019] The amount of component (D) used in the present invention in the cleansing cosmetic is 0.1% to 1.0% by mass, and more preferably 0.3% to 0.8% by mass. Within this range, the foam elasticity and foam durability can be maintained or improved while the stability of the formulation can be increased.

[0020] In addition to the above essential components, the cleansing cosmetic of the present invention can also contain components generally used in cosmetics, etc., as necessary. For example, pearlescent agents, moisturizing agents, thickeners, water-soluble polymers other than component (B), fragrances, bactericides, preservatives, antioxidants, pH adjusters, chelating agents, anti-inflammatory agents, antioxidants, cooling agents, herbal extracts, vitamins, and other additives can be added as appropriate. The blending ratio of these components when they are added can be appropriately selected depending on their types and purposes, and one type may be used alone, or two or more types may be used in appropriate combination. EXAMPLES

[0021] The present invention will be further described below with reference to examples, but the present invention is not limited to these examples in any way.

[0022] <Evaluation of the usability of the formulation> The formulations of the cleansing cosmetics are shown in the Examples and Comparative Examples. The usability of the formulations was judged by actual use to see if they were generally problem-free. Specifically, the formulations were filled into a polyethylene tube container with an inner mouth diameter of 8φ and a sleeve length of 131.5 mm, and discharged at room temperature (20°C). They were then actually foamed by hand to see if they could be used without any problems.

[0023] (Evaluation criteria for the usability of the formulation) ○: No problem if used △: Difficult to get out of the tube, difficult to use ×: Difficult to remove from the tube and poor usability

[0024] <Evaluation of foam elasticity> The foam elasticity was evaluated in a sensory evaluation test. 1: Prepare a 10% aqueous solution of the sample to be evaluated. 2: After sufficient foaming with a foaming net, a sensory evaluation was conducted by 10 expert panelists, who rated the foam elasticity according to the following criteria. The average score of the 10 panelists was calculated, with less than 3.0 points being marked x, 3.0 to 4.0 points being marked △, 4.0 to 4.5 points being marked ○, and 4.5 points or more being marked ◎.

[0025] (Evaluation criteria for foam elasticity) 5 points: Very satisfied 4 points: Somewhat satisfied 3 points: Normal 2 points: Somewhat dissatisfied 1 point: Unsatisfied

[0026] <Evaluation of foam durability> The foam durability was evaluated by the following method. 1. Prepare a 10% aqueous solution of the sample to be evaluated. 2. Place 20 g of a 10% aqueous solution of the sample to be evaluated in a 150 mL transparent PET container. 3. Shake 100 times simultaneously with the comparison sample. 4. After 10 minutes of shaking, measure the height of the drained liquid with a ruler and visually check to evaluate.

[0027] (Evaluation criteria for foam durability) ◎: The volume of drainage is less than 30% compared to the standard sample (Comparative Example 5). ◯: Compared with the standard sample (Comparative Example 5), the drainage volume is 30% or more and less than 60%. △: Compared with the standard sample (Comparative Example 5), the drainage volume is 60% or more and less than 90%. ×: The volume of drainage is 90% or more compared to the standard sample (Comparative Example 5).

[0028] <Stability evaluation of formulations> The preparations were left to stand at 40°C for one month, and their condition was visually evaluated by a skilled technician. ○: No separation △: Slight separation has occurred ×: Separation is evident

[0029] [Table 1]

[0030] [Table 2]

[0031] In terms of the usability, foam elasticity, and foam durability of the formulation, when the components of the present invention were blended, very good results were obtained compared to the comparative examples in which the components were not blended. In particular, when comparing Examples 1 and 2 with Comparative Examples 1 to 8, it can be seen that the absence of components (A) and (B) alone significantly reduced the foam elasticity and foam durability. As in Comparative Examples 9 and 10, when the blending amounts of components (A) and (B) are significantly increased, the formulation becomes too hard, causing problems in usability. This also shows that the blending amounts specified in the present application are preferable. Looking at Comparative Example 12, it can be seen that the stability of the formulation, foam elasticity, and foam durability are adversely affected. However, it can be seen that the combination of the present application in Example 1 comprehensively solves the problems of stability, foam elasticity, foam durability, and usability. Looking at Example 1 and Comparative Examples 13, 14, and 15, when component (D) was replaced with a similar component, or when the blending amount was outside the specified range, the same effect was not obtained in either case. These results also show that component (D) in the composition of the present invention is essential for solving the problems of stability, foam elasticity, and foam durability.

[0032] The cleansing cosmetic compositions having the following formulations were prepared in a conventional manner. It was confirmed that the effects of the present invention were achieved in all of the formulations.

[0033] (1) Facial cleanser Ingredients Amount (%) Lauric Acid 5 Myristic Acid 15 Palmitic Acid 16 Stearic Acid 10 Isostearic acid 0.5 Hydrogenated castor oil 0.8 1,2-Pentanediol 0.5 Dipropylene glycol 1 Glycerin 20 Lauryl hydroxysulfobetaine solution 10 Silicate (Li / Mg / Na) 0.2 Silicate (Na / Mg) 0.6 Hydroxypropyltrimonium Hyaluronate 0.05 Polyquaternium-7 0.25 Polyquaternium-39 0.2 Wild rose extract 0.1 Sodium hyaluronate 0.01 Potassium hydroxide 10.5 Chelating agent (appropriate amount) Preservative (appropriate amount) water residue Total 100

[0034] (2) Facial cleanser Ingredients Amount (%) Lauric Acid 7 Myristic Acid 15 Palmitic Acid 16 Stearic Acid 8 Isostearic acid 0.5 Hydrogenated castor oil 0.4 Dipropylene glycol 1 Glycerin 20 Lauryl hydroxysulfobetaine solution 10 Disteardimonium Hectorite 0.1 Silicate (Na / Mg) 0.4 Polyquaternium-7 0.25 Wild rose extract 0.1 Sodium hyaluronate 0.01 Potassium hydroxide 10.5 Chelating agent (appropriate amount) Preservative (appropriate amount) water residue Total 100

[0035] (3) Facial cleanser Ingredients Amount (%) Lauric Acid 7 Myristic Acid 15 Palmitic Acid 16 Stearic Acid 8 Isostearic acid 0.5 Hydrogenated castor oil 0.6 1,2-Pentanediol 0.5 Dipropylene glycol 1 Glycerin 20 Lauryl hydroxysulfobetaine solution 10 Silicate (Na / Mg) 0.2 Silicate (Al / Mg) 0.5 Hydroxypropyltrimonium Hyaluronate 0.05 Polyquaternium-7 0.25 Polyquaternium-10 0.2 Wild rose extract 0.1 Sodium hyaluronate 0.01 Potassium hydroxide 10.5 Chelating agent (appropriate amount) Preservative (appropriate amount) water residue Total 100

Claims

1. The following components (A) to (D) (A) Synthetic hectorite 0.1% by mass to 0.8% by mass (B) Cationic polymer: 0.0005% by mass to 0.5% by mass (C) Fatty acid soap 5.0% by mass to 50.0% by mass (D) Hydrogenated castor oil 0.1% by mass to 1.0% by mass A cleansing cosmetic comprising:

2. 2. The cleansing cosmetic composition according to claim 1, wherein the component (A) is silicic acid (Na / Mg).

3. 3. The cleansing cosmetic composition according to claim 1, wherein the component (B) is one or more selected from the group consisting of polyquaternium-7, polyquaternium-39, polyquaternium-47, polyquaternium-10, and hydroxypropyltrimonium hyaluronate.

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