Oil-in-water skin cleanser

Abstract

To provide an oil-in-water skin cleanser which is excellent in cushioning performance so that a feeling of thickness can be perceived between the cleanser and skin during use, and which further exhibits excellent rinsability and temporal stability.SOLUTION: An oil-in-water skin cleanser comprising the following components A to D. Component A: a polyglycerin fatty acid diester. Component B: hydroxypropyl starch phosphate or tamarind gum. Component C: an ester oil. Component D: water.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to an oil-in-water skin cleanser. [Background technology]

[0002] Skin cleansers that are generally foamed by adding water are commonly used. These skin cleansers usually contain anionic surfactants to remove sebum, cosmetics, etc., and may cause a feeling of tightness or dryness. In addition, foaming skin cleansers are difficult to wash off, so they are often used when it is easy to rinse thoroughly, such as during bathing.

[0003] Non-foaming skin cleansers have also been proposed as skin cleansers that are gentle on the skin. Patent Document 1 proposes an oil-in-water skin cleanser that contains, in specific proportions, component A: at least one of dipentaerythrityl hexa(hydroxystearate / stearic acid / rosin acid) and dipentaerythrityl hexahydroxystearate, component B: dipentaerythrityl tetra(hydroxystearate / isostearate), component C: an oil having a melting point of 30°C or less, component D: a nonionic surfactant, component E: a polyhydric alcohol, and component F: a water-soluble polymer, and that has excellent massaging properties, rinsing properties, and leaves the skin feeling moisturized and refreshed after rinsing. Patent Document 2 proposes a gel-type skin cleanser that does not require lathering and that has excellent massage effect, cleansing power, rinsing properties, and stability, and that contains (A) two or more water-soluble polymers selected from polysaccharides, (B) a nonionic surfactant selected from polyglyceryl monoalkyl ethers having a specific structure, and (C) a polyhydric alcohol in specific proportions. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2021-011463 [Patent Document 2] Japanese Patent Application Laid-Open No. 2015-229638 Summary of the Invention [Problem to be solved by the invention]

[0005] Non-foaming skin cleansers are excellent in providing a moisturizing feeling to the skin after rinsing, and because they are easy to rinse off, they can be easily used outside of bathing, for example, before leaving in the morning. However, with non-foaming skin cleansers, there is no foam between the hands and the skin, so they do not feel thick and tend to rub against the skin when used, which can lead to the impression that they are damaging the skin. The object of the present invention is to provide an oil-in-water skin cleanser that has excellent cushioning properties, allows a feeling of thickness between the skin and the cleanser during use, and is also excellent in rinsing ability and stability over time. [Means for solving the problem]

[0006] The means for solving the problems of the present invention are as follows. 1. An oil-in-water skin cleanser characterized by containing the following ingredients A to D: Component A: Polyglycerin fatty acid diester B ingredient: Hydroxypropyl starch phosphate or tamarind gum C ingredient: ester oil D component: water 2. The oil-in-water skin cleanser according to 1., wherein the component C includes one or more selected from cetyl ethylhexanoate, isostearyl neopentanoate, and ethylhexyl palmitate. 3. The component A includes one or more selected from polyglyceryl-10 diisostearate, polyglyceryl-10 dioleate, polyglyceryl-10 distearate, and polyglyceryl-6 dicaprate; 3. The oil-in-water skin cleanser according to 1. or 2., wherein the component B contains hydroxypropyl starch phosphate. [Effects of the Invention]

[0007] The oil-in-water skin cleanser of the present invention has excellent cushioning properties during use and feels thick, so that users can use it safely without feeling that it is causing friction or damage to the skin. The skin cleanser of the present invention has excellent stability over time and rinsability, and can be used easily even when not bathing, for example, at the washstand after waking up. DETAILED DESCRIPTION OF THE INVENTION

[0008] The oil-in-water skin cleanser of the present invention (hereinafter also referred to as skin cleanser) contains the following components A to D. Component A: Polyglycerin fatty acid diester B ingredient: Hydroxypropyl starch phosphate or tamarind gum C ingredient: ester oil D component: water In this specification, the expression "A to B (A and B are numerical values)" means a numerical range including both ends, that is, A or more and B or less.

[0009] Component A: Polyglycerin fatty acid diester Polyglycerol fatty acid diesters are diester-type nonionic surfactants obtained by esterifying fatty acids with polyglycerol, which is obtained by polymerizing glycerol. The degree of polymerization of glycerol in the polyglycerol group is not particularly limited, but is preferably 4 to 12, more preferably 6 to 10. The fatty acid group is not particularly limited and may be linear or branched, saturated or unsaturated, and the number of carbon atoms is preferably 6 to 22, more preferably 8 to 18. The two fatty acid groups that make up the diester may be the same or different. Examples of polyglycerol fatty acid diesters include polyglyceryl-10 diisostearate, polyglyceryl-10 distearate, polyglyceryl-10 dioleate, polyglyceryl-6 dicaprate, polyglyceryl-6 dicaprylate, and polyglyceryl-10 dimyristate, and one or more of these can be used. Among these, it is preferable to include one or more selected from polyglyceryl-10 diisostearate, polyglyceryl-10 dioleate, polyglyceryl-10 distearate, and polyglyceryl-6 dicaprate, and it is more preferable to include polyglyceryl-10 diisostearate.

[0010] The blending ratio of component A is not particularly limited as long as it is within the range in which the effects of the present invention are achieved, but for example, it is preferably 1% by mass or more and 10% by mass or less, more preferably 2% by mass or more, even more preferably 3% by mass or more, even more preferably 3.5% by mass or more, and more preferably 8% by mass or less, and even more preferably 6% by mass or less, relative to the total skin cleanser.

[0011] B ingredient: Hydroxypropyl starch phosphate or tamarind gum Hydroxypropyl starch phosphate and tamarind gum are commonly used as thickeners in cosmetics. Although the mechanism is unknown, adding hydroxypropyl starch phosphate or tamarind gum can produce a skin cleanser with excellent cushioning properties, rinsing properties, and stability. The blending ratio of component B is not particularly limited as long as it is within the range that achieves the effects of the present invention, but for example, in the case of hydroxypropyl starch phosphate, it is preferably 0.1% by mass or more and 10% by mass or less, more preferably 0.7% by mass or more, even more preferably 1.5% by mass or more, even more preferably 2.2% by mass or more, more preferably 9% by mass or less, and even more preferably 8% by mass or less, based on the total weight of the skin cleanser. In addition, in the case of tamarind gum, it is preferably 0.01% by mass or more and 1% by mass or less, more preferably 0.1% by mass or more, even more preferably 0.3% by mass or more, more preferably 0.8% by mass or less, and even more preferably 0.6% by mass or less, based on the total weight of the skin cleanser. When both hydroxypropyl starch phosphate and tamarind gum are blended, it is preferable that each be blended in the ratio described above.

[0012] C ingredient: ester oil The ester oil used in the present invention can be any ester oil commonly used in skin cleansers. Examples of the ester oil include cetyl ethylhexanoate, isostearyl neopentanoate, ethylhexyl palmitate, isotridecyl isononanoate, isononyl isononanoate, butylene glycol diisononanoate, triethylhexanoin, isostearyl isostearate, neopentyl glycol dicaprate, and pentaerythrityl tetraisostearate. Among these, it is preferable to use one or more selected from cetyl ethylhexanoate, isostearyl neopentanoate, and ethylhexyl palmitate.

[0013] The blending ratio of component C is not particularly limited as long as it is within the range in which the effects of the present invention are achieved, but for example, it is preferably 5% by mass or more and 50% by mass or less, more preferably 8% by mass or more, even more preferably 12% by mass or more, more preferably 40% by mass or less, and even more preferably 30% by mass or less, based on the total skin cleanser.

[0014] D component: water The skin cleanser of the present invention contains water as component D as an essential component. The water content can be set depending on the viscosity, etc., but can be, for example, 5% by mass or more and 90% by mass or less of the total skin cleanser of the present invention. The water content is preferably 30% by mass or more, more preferably 40% by mass or more, and even more preferably 45% by mass or more, and is preferably 80% by mass or less, and more preferably 75% by mass or less.

[0015] In addition to components (A) to (D), the skin cleanser of the present invention may contain other components typically used in skin cleansers, provided that the effects of the present invention are not impaired. Examples of such other components include surfactants other than component A, polyhydric alcohols, organic and inorganic powders, ethanol, moisturizing ingredients, pH adjusters, preservatives, antioxidants, fragrances, colorants (e.g., cyanocobalamin), and functional ingredients such as cosmetic ingredients (e.g., rosemary extract). However, the skin cleanser of the present invention is preferably a non-foaming type, and the ratio of component A to the total surfactants is preferably 60% by mass or more, more preferably 80% by mass or more, even more preferably 90% by mass or more, even more preferably 95% by mass or more, and most preferably 100% by mass.

[0016] In the skin cleansing agent of the present invention, the mass ratio (C / A) of component (C) to component (A) is preferably 1 or more and 10 or less. When component (B) is hydroxypropyl starch phosphate, the mass ratio (C / B) of component (C) to component (B) is preferably 1 or more, more preferably 2 or more, and is preferably 15 or less, more preferably 10 or less.

[0017] From the viewpoints of cushioning properties and rinsing properties, the skin cleanser of the present invention preferably has a fluid, medium viscosity. Specifically, the viscosity measured with a B-type viscometer (25°C, No. 3 rotor, 12 rpm, 30 seconds) is preferably 500 mPa s or more, more preferably 1000 mPa s or more, and is preferably 20000 mPa s or less, more preferably 15000 mPa s or less.

[0018] The skin cleanser of the present invention can be in the form of a liquid, gel, emulsion, cream, etc., and is not particularly limited, and can be used, for example, to cleanse the face, scalp, body, hands, etc. Among these, it is preferably used as a facial cleanser, and a non-foaming type facial cleanser is more preferred.

[0019] The method for producing the skin cleansing agent of the present invention is not particularly limited, and examples thereof include a method in which the above-mentioned components are mixed using a known mixing device such as a homomixer, a propeller mixer, a disper mixer, or a paddle mixer. The product form of the skin cleanser of the present invention is not particularly limited, and it may be in the form of a product filled in a pump container, a tube container, a jar container, etc. Among these, a product form in a pump container, which has excellent discharge properties, is preferred. [Example]

[0020] The present invention will be specifically described below with reference to examples and comparative examples. Skin cleansing agents were prepared to have the formulations shown in Tables 1 to 4 (% by mass), and were evaluated by the following methods. "Evaluation Method" A sensory evaluation was carried out by a panel of five specialists using the following scoring system, and the following scores were given. A score of △ or higher was considered to be acceptable. Cushioning 1g of the skin cleanser was placed on the back of the hand and applied in a circular motion for 20 seconds. The thickness of the applied layer was evaluated according to the following criteria. "Thickness" refers to the sensation of not having direct contact between the fingertips and the back of the hand during application, which is the opposite of a feeling of friction. ◎: Feels very thick. ○: Feels thick. △: Feels slightly thick. ×: No feeling of thickness.

[0021] · Easy to wash off 1g of the skin cleanser was applied to the face and spread in a circular motion for 20 seconds. After that, 50-60g of tap water was taken in the palm of the hand and the act of rinsing the skin cleanser was counted as one rinse. The number of rinses required until the skin cleanser felt completely washed away was used to evaluate the rinsability according to the following criteria. ◎: Can be washed away thoroughly within two rinses. ○: Can be washed away thoroughly after rinsing 3 to 4 times. △: Can be washed away thoroughly after 5-6 rinses. ×: It takes 7 or more rinses to be thoroughly washed off, or an oily film remains and cannot be thoroughly washed off.

[0022] ·Stability (50℃1M) 50g of skin cleanser was filled into a lightweight standard bottle No. 6 (6K bottle) and stored at 50℃ for one month. After that, the appearance was observed and evaluated according to the following criteria: ◎: The appearance is uniform and unchanged. ○: Slight unevenness is observed, but no oil floating is observed. △: A small amount of oil is visible. ×: Separation into aqueous and oil layers.

[0023] [Table 1]

[0024] [Table 2]

[0025] [Table 3]

[0026] [Table 4]

[0027] The oil-in-water skin cleanser obtained in the Example of the present invention was excellent in cushioning properties and rinsing properties, and also had excellent stability over time. From Examples 1 and 6 to 12 shown in Table 2, it was confirmed that cetyl ethylhexanoate, isostearyl neopentanoate, and ethylhexyl palmitate are particularly preferable as Component C. As shown in Table 3, Comparative Example 1, in which a polyglycerin fatty acid monoester was used instead of a polyglycerin fatty acid diester, Comparative Example 2, in which a polyglycerin fatty acid triester was used, and Comparative Examples 3 to 7, in which other surfactants were used, were inferior in rinsing properties, and Comparative Examples 3 to 7 were also inferior in stability. In Table 4, Examples 16 to 20 and Comparative Examples 8 to 12 are examples in which the concentration of the thickener was adjusted to achieve the same viscosity as Example 1. As shown in Table 4, Comparative Examples 8 to 12, which used thickeners other than hydroxypropyl starch phosphate and tamarind gum (Component C), were inferior in cushioning properties, rinse-off properties, or stability.

[0028] An example of a prescription is shown below. Formulation example 1: Facial cleanser (mass%) Polyglyceryl-10 Diisostearate 4 Sodium stearoyl glutamate 0.5 Polyglyceryl-2 Triisostearate Cetyl ethylhexanoate 13 Stearic acid 0.5 Silica 0.5 Betaine 1 Hydroxypropyl starch phosphate 3 Carbomer 0.14 Potassium hydroxide 0.03 Glycerin 3 DPG 5 water remainder

[0029] Formulation example 2: Cleansing agent (mass%) Polyglyceryl-6 Dicaprate 5 Sodium stearoyl glutamate 1 Cetyl ethylhexanoate 15 Dicaprylyl Ether 5 Cetyl alcohol 0.5 Stearic acid 0.2 Hydroxypropyl Starch Phosphate 2.5 Carbomer 0.15 Potassium hydroxide 0.03 DPG 6 Pentylene Glycol 2 water remainder

[0030] Formulation example 3: Body cleanser (mass%) Polyglyceryl-10 Diisostearate 4 Sodium Methyl Cocoyl Taurate 0.5 Ethylhexyl palmitate 10 Isostearyl neopentanoate 5 Arachidyl alcohol 0.5 Stearic acid 0.1 Medufoam Oil 2 Silica 0.3 PEG-75 1 Hydroxypropyl starch phosphate 2.8 Carbomer 0.14 Potassium hydroxide 0.03 Glycerin 5 BG 5 DPG 5 water remainder

Claims

1. An oil-in-water skin cleanser characterized by containing the following ingredients A to D: Component A: Polyglycerin fatty acid diester B component: Hydroxypropyl starch phosphate or tamarind gum C component: ester oil D component: water

2. 2. The oil-in-water skin cleanser according to claim 1, wherein the component C comprises one or more selected from the group consisting of cetyl ethylhexanoate, isostearyl neopentanoate, and ethylhexyl palmitate.

3. The component A includes one or more selected from polyglyceryl-10 diisostearate, polyglyceryl-10 dioleate, polyglyceryl-10 distearate, and polyglyceryl-6 dicaprate, 3. The oil-in-water skin cleanser according to claim 1, wherein the component B comprises hydroxypropyl starch phosphate.

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