Cleansing cosmetics

Abstract

To provide cleansing cosmetics that demonstrate superior foam resilience and persistence, without compromising their stability or usability, and also exhibit superior safety.SOLUTION: Cleansing cosmetics include following components (A)-(D): (A) synthetic hectorite of 0.1 mass%-0.8 mass%, (B) cationic polymer of 0.0005 mass%-3.0 mass%, (C) fatty acid soap of 5.0 mass%-50.0 mass% and (D) hydrogenated castor oil of 0.1 mass%-2.0 mass%. The component (B) includes 50% or more of (B1) a cationic polymer comprising dimethyldiallylammonium chloride and an acrylic acid monomer as constituent units.SELECTED DRAWING: None

Description

Technical Field

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[0003]

[0001] The present invention relates to a cleansing cosmetic, and more particularly, to a cleansing cosmetic that contains specific components and is excellent in foam elasticity, foam persistence, and further safety without impairing stability and usability.

Background Art

[0002] Cleansing cosmetics are used for the purpose of removing dirt on the skin and keeping the skin healthy. Usually, cleansing cosmetics mainly composed of soap or weakly acidic to neutral surfactants are used to remove dirt, but improvement in fineness of foam, foam elasticity, and foam persistence has been demanded for comfortable use. When washing with foam having excellent elasticity, the finger pressure on the skin is alleviated, and washing that is gentler to the skin without a frictional feeling becomes possible. However, if the foam persistence is poor, the foam will defoam during washing, resulting in poor skin feel and loss of a comfortable use feeling. From such a viewpoint, technologies for enhancing foam elasticity and foam persistence have always been demanded.

[0003] Generally, as means for improving foam elasticity and foam persistence, there are methods of increasing the strength of foam or reducing the surface tension. For example, it is known to blend a cationic polymer or a surfactant (Patent Documents 1 to 3). However, although satisfactory foam elasticity and foam persistence can be obtained by using these components, a sticky feeling occurs during use, increasing discomfort. Furthermore, it causes stringing when dispensing from the container, resulting in a problem of deteriorated usability. In addition, there is a concern about irritation to the skin when the surfactant is highly blended, and furthermore, problems such as stinging eyes during face washing may occur.

[0004] Furthermore, it has been disclosed that combining water-swellable clay minerals with cleansing components improves the stability of gel formulations and their cleansing properties (Patent Documents 4-5). Water-swellable clay minerals refer to synthetic or natural smectites, particularly hectorite, laponite, and montmorillonite. Patent Document 4 describes a gel-type cleanser for washing human skin and hair, comprising 3-15% by mass of water-swellable clay minerals, water, and 10-40% by mass of anionic surfactant. Patent Document 5 describes a cleanser consisting of 25-50% by mass of water-swellable clay minerals, 8-25% by mass of anionic surfactant, and 25-65% by mass of water. While these cleansers have improved formulation stability and post-use moisturizing properties, they were not satisfactory in terms of foam elasticity and foam quality during washing. Furthermore, Patent Document 6 discloses a technique for improving the stability of a formulation by combining a water-swellable clay mineral and a cationic component with a detergent containing a high concentration of alcohol. However, this document does not mention foam quality, and in fact, the foam elasticity and foam quality during washing with this combination were not satisfactory.

[0005] The inventors focused on soap-based ingredients that use soap as a cleaning agent. Generally, it is known that using soap-based cleaning agents results in good lathering and a highly viscous, creamy formulation. However, soap-based cleansers have an alkaline pH, and under these conditions, the addition of water-swellable clay minerals or cationic polymers further increases the viscosity of the formulation, leading to problems with usability and stability.

[0006] The present inventors have created a cleansing cosmetic using soap-based cleansing ingredients, which combines 0.8% by mass or less of synthetic hectorite, a water-swellable clay mineral, 0.5% by mass or less of cationic polymer, and 1.0% by mass or less of hydrogenated castor oil, thereby achieving a cleansing cosmetic with good foam elasticity and stability (Patent Application 2021-024112). However, a remaining issue was that when the amount of cationic polymer was increased in order to further improve foam elasticity and foam persistence, the usability and stability were impaired.

[0007] Given this background, conventional technologies have not been able to achieve a cleansing cosmetic that combines good lathering and foam elasticity, particularly in soap-based cleansers, with good usability, foam elasticity, and foam quality. Therefore, solving these problems was an urgent task in order to develop a cleansing cosmetic that is comfortable and safe to use, with excellent foam elasticity and foam persistence. [Prior art documents] [Patent Documents]

[0008] [Patent Document 1] Japanese Patent Publication No. 2007-269704 [Patent Document 2] Japanese Patent Publication No. 2014-181223 [Patent Document 3] Japanese Patent Publication No. 2015-189674 [Patent Document 4] Japanese Patent Publication No. 2007-254432 [Patent Document 5] Japanese Patent Publication No. 2009-167126 [Patent Document 6] Japanese Patent Publication No. 2017-048157 [Overview of the Initiative] [Problems that the invention aims to solve]

[0009] The present invention has been made in view of the above-mentioned prior art, and aims to provide a cleansing cosmetic that is excellent in foam elasticity and foam persistence without impairing stability or usability, and is also excellent in safety. [Means for solving the problem]

[0010] In order to achieve the above objective, the inventors conducted diligent research, The following components (A) to (D) (A) Synthetic hectorite 0.1% to 0.8% by mass (B) Cationic polymer 0.0005% to 3.0% by mass (C) Fatty acid soap 5.0% by mass to 50.0% by mass (D) Hydrogenated castor oil 0.1% to 2.0% by mass We found that the above problems can be solved by including (B1)dimethyldiallylammonium chloride and acrylic acid monomer as constituent units in component (B), and thus completed the present invention. [Effects of the Invention]

[0011] According to the present invention, it is possible to provide a cleansing cosmetic that is excellent in foam elasticity and foam persistence without compromising stability or usability, and is also excellent in safety. [Best Mode for Carrying Out the Invention]

[0012] The present invention will be described in more detail below. Unless otherwise noted, when the amount of a component is expressed in "%" below, it means mass percent.

[0013] The component (A) synthetic hectorite used in this invention is a type of synthesized smectite. These have the property of producing viscosity when mixed with water, and are characterized by fewer impurities and smaller particles compared to natural smectite. Such synthetic hectorite is not particularly limited as long as it is a synthetic clay mineral commonly used in cosmetics, but specifically synthetic hectorite such as silica (Li / Mg / Na) or silica (Na / Mg), with silica (Na / Mg) being particularly preferred. By incorporating this component and using it in combination with other components described in the claims, foam elasticity and foam persistence are particularly improved. These components (A) may be used individually, or two or more may be used in appropriate combinations.

[0014] The amount of component (A) synthetic hectorite used in the present invention is 0.1% to 0.8% by mass in the cleansing cosmetic, with 0.3% to 0.6% by mass being more preferable. Within this range, issues such as foam elasticity, foam persistence, stability in the formulation, and usability can be resolved.

[0015] Component (B) Cationic polymers are natural or synthetic polymers having cationic functional groups within their molecules. Specifically, these include cationized cellulose, cationized starch, cationized xanthan gum, cationized fenugreek gum, cationized guar gum, cationized tara gum, cationized locust bean gum, guar hydroxypropyltrimonium chloride, hydroxypropyltrimonium hyaluronate, polydiallyl quaternary ammonium salts, vinylimidazolium trichloride / vinylpyrrolidone copolymer, vinylpyrrolidone / quaternary dimethylaminoethyl methacrylate copolymer, vinylpyrrolidone / alkylaminoacrylate copolymer, vinylpyrrolidone / alkylaminoacrylate / vinylcaprolactam copolymer, vinylpyrrolidone / methacrylamide copolymer Polyquaternium-4, polyquaternium-7, polyquaternium-10, polyquaternium-61, polyquaternium-64, polyquaternium-65, and polyquaternium-22 are examples. Polyquaternium-7, polyquaternium-39, polyquaternium-47, polyquaternium-47, polyquaternium-10, polyquaternium-10, polyquaternium-61, polyquaternium-64, polyquaternium-65, and polyquaternium-22 are particularly preferred, and polyquaternium-7, polyquaternium-39, polyquaternium-47, polyquaternium-10, and polyquaternium-22 are even more preferred.

[0016] Component (B) The cationic polymer contains 50% or more of (B1) "cationic polymer having dimethyldiallylammonium chloride and acrylic acid monomer as constituent units" in component (B). Examples of (B1) include polyquaternium-22 and polyquaternium-39, and polyquaternium-22 is particularly preferred. By containing 50% or more of this (B1) in component (B), even if the blending amount of the cationic polymer is increased, deterioration in usability, foam quality, foam elasticity, and stability does not occur. It has been found that when the blending amount of the cationic polymer of component (B) is increased in the presence of component (A), deterioration in usability occurs. However, when (B1) is contained in component (B) at 50% or more, deterioration in usability does not occur, and the foam elasticity, foam quality, and stability are also satisfactory.

[0017] Component (B) may be used alone or in combination of two or more as long as it contains 50% or more of (B1) "cationic polymer having dimethyldiallylammonium chloride and acrylic acid monomer as constituent units" in component (B). Further, even if component (B) other than (B1) is contained, the effects of the present invention are achieved as long as the above conditions are satisfied.

[0018] The blending amount of the cationic polymer of component (B) used in the present invention is 0.0005% by mass to 3.0% by mass, and more preferably more than 0.5% by mass to 2.5% by mass. In this range, problems such as foam elasticity, foam persistence, stability in the formulation, and usability can be solved.

[0019] Component (C) fatty acid soap is not particularly limited, but refers to the salt of a fatty acid and an alkali metal. Specific fatty acids include caprylic acid, capric acid, lauric acid, myristic acid, pentadecanoic acid, palmitic acid, palmitoleic acid, margaric acid, stearic acid, oleic acid, vaccenic acid, linoleic acid, etc. It is not particularly limited, not only linear but also branched forms of the above fatty acids, etc., but preferably lauric acid, myristic acid, palmitic acid, isostearic acid, stearic acid. From the viewpoints of foam elasticity, foam persistence, stability in the preparation, safety, etc., fatty acid soaps of these sodium salts or potassium salts are desirable. These (C) components may be used alone respectively, or two or more kinds may be appropriately combined and used.

[0020] The blending amount of component (C) fatty acid soap used in the present invention is 0.0 mass% to 50.0 mass% in the cleansing cosmetic 10 .0 mass% to 40.0 mass% is more preferable. By blending within this range, more excellent foam elasticity and foam persistence can be realized. 10 .0 mass% to 40.0 mass% is more preferable. By blending within this range, more excellent foam elasticity and foam persistence can be realized.

[0021] The hydrogenated castor oil of component (D) used in the present invention is not particularly limited, but is used as one kind of oily component expecting to improve the stability of the composition. The production method is also not particularly limited. For example, it is obtained by hydrogenating castor oil extracted from the seeds of Ricinus communis.

[0022] The blending amount of component (D) used in the present invention is 0.1 mass% to 2.0 mass% in the cleansing cosmetic, and 0.3 mass% to 1.5 mass% is more preferable. Within this range, the stability of the preparation can be enhanced while maintaining or improving the foam elasticity and foam persistence.

[0023] In addition to the essential components mentioned above, the cleansing cosmetic composition of the present invention may also contain other components commonly used in cosmetics, as needed. For example, pearlescent agents, moisturizers, thickeners other than component (A), 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 proportion of these components can be appropriately selected according to their type and purpose, and they may be used individually or in combination of two or more as appropriate. [Examples]

[0024] The present invention will be further explained below with reference to examples. These examples are not intended to limit the present invention in any way.

[0025] <Evaluation of formulation usability> The formulations of the cleansing cosmetic are shown in the Examples and Comparative Examples. The usability of the formulations was determined by actual use to see if they were at a level that would not cause any problems in general use. Specifically, the formulations were filled into polyethylene tube containers with an inner diameter of 8 mm and a sleeve length of 131.5 mm, dispensed at room temperature (20 degrees Celsius), and judged whether they could be used without problems by actually foaming them by hand.

[0026] (Evaluation criteria for the usability of the formulation) ○: There are no particular problems with using it. △: Difficult to dispense from the tube, making it difficult to use. ×: Difficult to dispense from the tube, poor usability.

[0027] <Evaluation of foam elasticity> Foam elasticity was evaluated using a sensory characteristics test. 1. Prepare a 10% aqueous solution of the sample to be evaluated. 2. After thoroughly foaming the mixture using a foaming net, a sensory evaluation was conducted by 10 expert panelists, who each evaluated the foam's elasticity based on the following criteria. The average of the 10 panelists' scores was calculated, and scores below 3.0 were marked with ×, 3.0 to less than 4.0 with △, 4.0 to less than 4.5 with ○, and 4.5 or higher with ◎.

[0028] (Evaluation criteria for foam elasticity) 5 stars: Very satisfied 4 points: Somewhat satisfied 3 points: Average 2 points: Somewhat dissatisfied 1 point: Dissatisfaction

[0029] <Evaluation of foam persistence> The persistence of the foam was evaluated using the following method. 1. Prepare a 10% aqueous solution of the evaluation sample. 2. Place 20g of the 10% aqueous solution of the evaluation sample into a 150mL transparent PET container. 3. Shake the comparison sample 100 times simultaneously. 4. After shaking, let it stand for 10 minutes and measure the height of the drained liquid with a ruler to evaluate the amount of liquid drained.

[0030] (Evaluation criteria for foam persistence) ◎: Compared to the standard sample (Comparative Example 5), the amount of drained liquid is less than 30%. ○: Compared to the standard sample (Comparative Example 5), the amount of drained liquid is 30% or more but less than 60%. △: Compared to the standard sample (Comparative Example 5), the drainage volume is 60% or more but less than 90%. ×: Compared to the standard sample (Comparative Example 5), the drainage volume is 90% or more.

[0031] <Evaluation of the stability of the formulation> The formulations were left to stand at 40 degrees Celsius for one month, and their condition was visually evaluated by skilled technicians. ○: No separation △: Slight separation is occurring. ×: Separation is clearly occurring.

[0032] [Table 1]

[0033] [Table 2] *Constituent monomers of cationic polymers Polyquaternium-6:dimethyldiallylammonium chloride Polyquaternium-7:dimethyldiallylammonium chloride / acrylamide Polyquaternium-22:Dimethyldiallylammonium Chloride / Acrylic Acid Polyquaternium-39: Dimethyldiallylammonium Chloride / Acrylamide / Acrylic Acid Polyquaternium-47: Methacrylamidopropyltrimethylammonium chloride / Methacrylic acid / Acrylic acid Polyquaternium-64: 2-methacryloyloxyphosphorylcholine / 2-hydroxy-3-methacryloyloxypropyltrimethylammonium chloride

[0034] Regarding the usability, foam elasticity, and foam persistence of the formulation, incorporating the components of the present invention yielded significantly better results compared to comparative examples without the components. Comparing Examples 1 and 2 with Comparative Example 1, a very significant difference was observed in terms of foam elasticity and foam quality. In Comparative Examples 2 and 3, where the ratio of (B1) in component (B) was less than 50%, it was evident that usability deteriorated, and foam quality, foam elasticity, and stability worsened. From these results, Examples 1 to 17, in which component (B) contains 50% or more of component (B1), showed good usability, foam elasticity, foam quality, and stability, thus achieving the objective of the present invention. Comparative Examples 4 and 5 are examples using cationic polymers with constituent monomers different from those of component (B1). When cationic polymers do not contain dimethyldiallylammonium chloride / acrylic acid as constituent monomers, especially at high concentrations of cationic polymers, the results for usability, foam quality, and foam elasticity are poor. On the other hand, in Examples 1 to 17, which incorporated (B1), the usability, foam elasticity, foam quality, and stability were excellent. Furthermore, when component (B) was replaced with other polymers, there were no problems with usability or stability, but the foam elasticity and foam quality were not satisfactory. Comparing Example 1 with Comparative Examples 13, 14, and 15, when component (D) was replaced with a similar component, or when the amount added fell outside the specified range, the objective of the present invention could not be achieved in any case. From these results, it can be seen that component (D) is essential in the present invention's composition for solving the problems of stability, foam elasticity, and foam persistence.

[0035] Cleansing cosmetics were prepared using conventional methods according to the following formulations. It was confirmed that all formulations exhibited the effects of the present invention.

[0036] (1) Facial cleansing foam Ingredients Amount (%) Lauric acid 5 Myristic acid 15 Palmitic acid 16 Stearic acid 10 Isostearic acid 0.5 Hydrogenated castor oil 1.8 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-22 1.0 Wild rose extract 0.1 Sodium hyaluronate 0.01 Potassium hydroxide 10.5 Chelating agent (appropriate amount) Preservative (appropriate amount) water residue Total 100

[0037] (2) Facial cleansing foam 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 0.5 Polyquaternium-22 2.0 Wild rose extract 0.1 Sodium hyaluronate 0.01 Potassium hydroxide 10.5 Chelating agent (appropriate amount) Preservative (appropriate amount) water residue Total 100

[0038] (3) Facial cleansing foam 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-22 1.2 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% to 0.8% by mass (B) Cationic polymer 0.0005% to 3.0% by mass (C) Fatty acid soap 10.0% by mass to 50.0% by mass (D) Hydrogenated castor oil 0.1% to 2.0% by mass A cleansing cosmetic containing, and comprising 50% or more of a cationic polymer having (B1) dimethyldiallylammonium chloride and acrylic acid monomer as constituent units in component (B).

2. The following components (A) to (D) (A) Synthetic hectorite 0.1% to 0.8% by mass (B) Cationic polymer more than 0.5% by mass to 3.0% by mass (C) Fatty acid soap 10.0% by mass to 50.0% by mass (D) Hydrogenated castor oil 0.1% to 2.0% by mass A cleansing cosmetic containing, and comprising 50% or more of a cationic polymer having (B1) dimethyldiallylammonium chloride and acrylic acid monomer as constituent units in component (B).

3. Component (B) contains 50% or more of a cationic polymer having (B1) dimethyldiallylammonium chloride and acrylic acid monomer as constituent units. The cleansing cosmetic composition according to claim 1 or claim 2, wherein if component (B) is included in addition to (B1), component (B) other than (B1) is one or more selected from polyquaternium-7, polyquaternium-47, polyquaternium-10, and hydroxypropyltrimonium hyaluronate.

4. Component (A) is silicate (Na / Mg), Component (B) contains 50% or more of a cationic polymer having (B1) dimethyldiallylammonium chloride and acrylic acid monomer as constituent units. The cleansing cosmetic composition according to claim 1 or claim 2, wherein if component (B) is included in addition to (B1), component (B) other than (B1) is one or more selected from polyquaternium-7, polyquaternium-47, polyquaternium-10, and hydroxypropyltrimonium hyaluronate.

5. Component (A) is silicate (Na / Mg), Component (B) contains 50% or more of (B1) polyquaternium-22 and / or polyquaternium-39, The cleansing cosmetic composition according to claim 1 or claim 2, wherein if component (B) is included in addition to (B1), component (B) other than (B1) is one or more selected from polyquaternium-7, polyquaternium-47, polyquaternium-10, and hydroxypropyltrimonium hyaluronate.

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