Water-based skin care products

Abstract

To provide an aqueous skin cosmetic that spreads well during application and has a refreshing, moisturizing effect, and gives a feel of penetration into the skin even in the summer when the skin tends to be sticky due to sweat and sebum.SOLUTION: An aqueous skin cosmetic contains the following component (A) of 0.1-10 mass%, component (B) of 0.1-6 mass%, and component (C) of 0.05-5 mass%. (A) A dicarboxylic acid diester of a C2-12 dicarboxylic acid and a C1-10 monohydric alcohol. (B) An alkylene oxide derivative represented by the following formula [I]: MG-[O(EO)x(PO)y-(BO)z]4 (where each symbol is as described in Claim 1).(C) A proteoglycan.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to an aqueous skin cosmetic preparation that has excellent spreadability when applied, has a refreshing moisturizing effect, and provides a feeling of penetration even in summer when the skin is prone to become sticky due to sweat and sebum. [Background technology]

[0002] Skin cosmetics are used to supply moisture and moisturizing ingredients to the skin and prevent dryness and rough skin. In particular, in winter, skin problems caused by dryness are likely to occur, so cosmetics with high moisturizing properties tend to be preferred. On the other hand, although dryness is less likely to occur in summer, it is prone to stickiness due to sweat and sebum, so cosmetics with a relatively refreshing feel tend to be preferred over those with high moisturizing properties. However, in recent years, it is known that in summer, the barrier function of the skin is weakened due to ultraviolet rays, air conditioners, and excessive sebum secretion, and the phenomenon of a lack of moisture inside the skin (inner dryness) can cause dry skin even in summer. Therefore, there is a demand for cosmetics that have both high moisturizing properties to prevent dryness and a refreshing feel that is not sticky.

[0003] One method to increase the moisturizing properties of skin cosmetics is to incorporate moisturizers such as polyhydric alcohols, water-soluble polymers, and amino acids, but incorporating moisturizers can lead to problems such as stickiness and sliminess, and poor skin compatibility. In addition, the coating sensation created by moisturizers makes it easier to feel a high level of moisturization, but this can be uncomfortable for sticky skin in the summer. Contrary to the coating sensation, cosmetics that give a feeling of penetration have the advantage of leaving less residual feeling and giving a refreshing feeling, and the feeling of the product penetrating into the skin makes it easy to feel that the inside of the skin is moisturized. However, there are problems such as not being able to provide a sufficient moisturizing feeling, and the fact that the product quickly blends into the skin and spreads poorly when applied. In particular, in the summer, there are problems with the skin not being able to fully penetrate when washing a sweaty face with only water in the morning and not fully removing sebum, or when sweating heavily after a bath.

[0004] Patent Document 1 discloses that a skin preparation that combines a mixed fatty acid containing a dibasic acid, a glycerin oligoester, tranexamic acid and its derivatives, and a dihydric alcohol has the effect of providing a moisturizing feeling and a refreshing feeling. However, this skin preparation is insufficient in terms of spreadability and penetration when applied.

[0005] Patent Document 2 discloses that an oil-in-water emulsion composition containing a volatile oil, a polar oil having a specific melting point, a higher alcohol or higher fatty acid that is solid at 25° C., and a hydrophobic powder is excellent in moisturizing feeling, good spreadability on the skin, and non-stickiness. However, this emulsion composition is insufficient in terms of penetration feeling.

[0006] Patent Document 3 discloses that an oil-in-water emulsion cosmetic containing a water-soluble thickener and having an adjusted emulsion particle size, hardness, etc., is excellent in terms of refreshing feeling, good spreadability on the skin, and penetration. However, this emulsion cosmetic is insufficient in terms of moisturizing feeling and penetration on sweaty skin in summer.

[0007] As described above, there is a demand for aqueous skin cosmetics that have good spreadability when applied, have refreshing moisturizing properties, and can be felt penetrating even in summer when the skin tends to become sticky due to sweat and sebum. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] JP 2015-218135 A [Patent Document 2] JP 2013-199442 A [Patent Document 3] JP 2009-102281 A Summary of the Invention [Problem to be solved by the invention]

[0009] To provide an aqueous skin cosmetic which has good spreadability when applied, is excellent in refreshing moisturizing property, and gives a feeling of penetration even in summer when the skin is likely to become sticky due to sweat and sebum. [Means for solving the problem]

[0010] As a result of intensive research into solving the above problems, the present inventors discovered that the above problems can be solved by the aqueous skin cosmetic preparation described below, and thus completed the present invention.

[0011] That is, the present invention is an aqueous skin cosmetic preparation characterized by containing 0.1 to 10 mass % of the following component (A), 0.1 to 6 mass % of component (B), and 0.05 to 5 mass % of component (C). (A) Dicarboxylic acid diester of dicarboxylic acid having 2 to 12 carbon atoms and monohydric alcohol having 1 to 10 carbon atoms (B) An alkylene oxide derivative represented by the following formula [I] MG-[O(EO)x(PO)y-(BO)z]4...Formula[I] (In the formula, MG is a residue obtained by removing a hydroxyl group from methyl glucoside. EO is an oxyethylene group, PO is an oxypropylene group, x and y are the average number of moles of EO and PO added, respectively, and 0≦x≦20, 1≦y≦10. When x is not 0, EO and PO are added randomly, and the mass ratio of PO to the total mass of EO and PO is 10 to 45 mass%. BO is an oxybutylene group, z is the average number of moles of BO added, and 0≦z≦4.) (C) Proteoglycan Effect of the Invention

[0012] The aqueous skin cosmetic of the present invention has excellent spreadability when applied and refreshing moisturizing properties, and can impart a feeling of penetration even in summer when the skin is prone to becoming sticky due to sweat and sebum. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Hereinafter, an embodiment of the present invention will be described. In this specification, a numerical range defined using the symbol "~" includes both the upper and lower limits of the symbol "~". For example, "2~5" means 2 or more and 5 or less.

[0014] The aqueous skin cosmetic of the present invention contains (A) a dicarboxylate, (B) an alkylene oxide derivative represented by formula [I], and (C) a proteoglycan. Each component will be described below.

[0015] <Component (A): Dicarboxylate> The component (A) used in the present invention is a dicarboxylic acid diester of a dicarboxylic acid having 2 to 12 carbon atoms and a monohydric alcohol having 1 to 10 carbon atoms. Examples of dicarboxylic acids include oxalic acid, malonic acid, succinic acid, adipic acid, pimelic acid, suberic acid, azelaic acid, and sebacic acid, and dicarboxylic acids having 4 to 10 carbon atoms such as succinic acid are preferred. Examples of the monohydric alcohol include ethanol, ethoxyethanol, propanol, isopropanol, butanol, isobutanol, nonanol, and decanol, and preferred are monohydric alcohols having 2 to 6 carbon atoms, such as ethoxyethanol.

[0016] Examples of dicarboxylate diesters include diisobutyl adipate, dibutyl adipate, diisopropyl adipate, diethyl sebacate, diisopropyl sebacate, diethylhexyl succinate, diethoxyethyl succinate, etc. Among these, one type may be used alone, or two or more types may be used in combination. Among these, from the viewpoint of refreshing moisturizing feeling and penetration feeling, diisopropyl adipate, diethyl sebacate, and diethoxyethyl succinate are preferred, and from the viewpoint of good spreadability, diethoxyethyl succinate is more preferred.

[0017] Commercially available products can be used as component (A). For example, diethoxyethyl succinate may be "Crodamol DES-LQ-(JP)" manufactured by Croda Japan Ltd.

[0018] The content of component (A) in the aqueous skin cosmetic of the present invention is 0.1 to 10% by mass, preferably 0.3 to 5% by mass, and more preferably 0.5 to 2.5% by mass, based on the total amount of the composition. If the content of component (A) is too low, the spreadability, moisturizing properties, and penetration feeling may not be sufficient, whereas if the content is too high, the stability and usability may be reduced.

[0019] <Component (B): Alkylene oxide derivative> The component (B) used in the present invention is an alkylene oxide derivative represented by the following formula [I]. MG-[O(EO)x(PO)y-(BO)z]4...Formula[I] In the formula, MG is a residue obtained by removing a hydroxyl group from methyl glucoside. EO is an oxyethylene group, PO is an oxypropylene group, x and y are the average number of moles of EO and PO added, respectively, and are 0≦x≦20 and 1≦y≦10. When x is not 0, EO and PO are added randomly, and the mass ratio of PO to the total mass of EO and PO is 10 to 45 mass%. BO is an oxybutylene group, z is the average number of moles of BO added, and is 0≦z≦4. Preferably, 0≦x≦10, 3≦y≦7, and 0≦z≦1. Furthermore, in terms of a refreshing moisturizing feeling and a feeling of penetration after rinsing with water, it is more preferable that x=0, 4≦y≦6, and z=0.

[0020] Commercially available products can be used as component (B), such as "Macbiobride MG-20P" (manufactured by NOF Corp., in formula [I], x = 0, y = 5, z = 0) and "Macbiobride MG-10E" (manufactured by NOF Corp., in formula [I], x = 2.5, y = 0, z = 0).

[0021] The content of component (B) in the aqueous skin cosmetic of the present invention is 0.1 to 6% by mass, preferably 0.3 to 5% by mass, and more preferably 0.5 to 4% by mass, based on the total amount of the composition. If the content of component (B) is too low, the moisturizing feeling and the penetrating feeling may not be sufficiently obtained, whereas if the content is too high, the spreadability, refreshing feeling, and stability at high temperatures may decrease.

[0022] <Component (C): Proteoglycan> The component (C) used in the present invention is a proteoglycan. Proteoglycans are complexes of sugars and proteins with a special structure, and include both animal and vegetable proteoglycans. In the present invention, either animal or vegetable proteoglycans can be used as component (C), but in consideration of production costs and the recent trend toward vegetable raw materials, it is preferable to use vegetable proteoglycans.

[0023] As the vegetable proteoglycan, those made from gum arabic obtained from Acacia senegal Willdenow, which belongs to the Acacia genus of the Mimosa family, or from closely related plants of the same genus, are preferably used. Commercially available vegetable proteoglycans include "Arabic Coal SS" (weight average molecular weight: about 200,000, manufactured by San-ei Pharmaceutical Trading Co., Ltd.). In addition, commercially available products as aqueous solutions of proteoglycans can also be used, such as "Phytoproteoglycan (registered trademark)" (weight average molecular weight: about 1.2 million, manufactured by NOF Corp.). In the aqueous skin cosmetic preparation of the present invention, the above-mentioned proteoglycans may be used alone or in combination of two or more kinds.

[0024] The weight-average molecular weight of the proteoglycan is preferably 100,000 to 3.5 million, more preferably 150,000 to 2 million, further preferably 500,000 to 2 million, and particularly preferably 1 million to 1.5 million.

[0025] The content of component (C) in the aqueous skin cosmetic of the present invention is 0.05 to 5 mass % of the total amount of the composition, preferably 0.1 to 4 mass %, and more preferably 0.5 to 2 mass %. If the content of component (C) is too low, a sufficient moisturizing feeling may not be obtained, whereas if it is too high, stickiness may occur or stability may decrease.

[0026] <Water> The aqueous skin cosmetic preparation of the present invention usually contains water in addition to the above components (A) to (C). As the water, water generally used for cosmetics or pharmaceuticals can be used, and it is preferable to use, for example, ion-exchanged water, purified water, water for injection, etc. The water content in the aqueous skin cosmetic preparation of the present invention is set as the amount to make the total amount 100% by mass after adding the above-mentioned components (A) to (C) and, if necessary, other components described below, and is usually 75 to 99.75% by mass, preferably 79 to 99% by mass, and more preferably 75 to 97% by mass.

[0027] <Other ingredients> In addition to the above-mentioned components (A) to (C) and water, the aqueous skin cosmetic of the present invention may contain other components commonly used in cosmetics or pharmaceuticals, if necessary, within the scope of not impairing the characteristics of the present invention. Examples of other components include nonionic surfactants, moisturizing agents, sequestering agents, thickeners, pigments, preservatives, pH adjusters, and fragrances. If necessary, a hydrophilic organic solvent may be added, and examples of such organic solvents include ethanol, 1,3-butylene glycol, dipropylene glycol, propylene glycol, and glycerin.

[0028] The content of the above-mentioned other ingredients in the aqueous skin cosmetic preparation of the present invention can be set according to the amount typically used in cosmetics depending on the purpose, but is usually 25% by mass or less, preferably 0.1 to 20% by mass, and more preferably 0.5 to 15% by mass.

[0029] The aqueous skin cosmetic preparation of the present invention can be produced by a conventional method, for example, by mixing the above-mentioned components (A) to (C) and, if necessary, other components in water and / or an organic solvent and dissolving or dispersing them uniformly.

[0030] <Application> The aqueous skin cosmetic composition of the present invention can be applied not only to the face but also to various parts of the body. However, since it has excellent refreshing moisturizing properties and provides a feeling of penetration even in the summer when the skin is prone to becoming sticky due to sweat and sebum, it is preferable to apply it to the face, as this makes it easier to feel the effects of the present invention. EXAMPLES

[0031] The present invention will now be described more specifically with reference to examples and comparative examples. Aqueous skin cosmetics were prepared using components (A) to (C), component (B'), component (C'), a preservative, and purified water according to the compositions shown in Table 1 (Examples 1 to 4) and Table 2 (Comparative Examples 1 to 5), and were evaluated according to the following methods (1) to (3). Tables 1 and 2 show the blended components. The following ingredients were used as commercially available products. The amount of each ingredient was calculated from the content of the active ingredient (target ingredient) or solid content in the mixed product. When adjusting the total amount to 100% by mass using water, the water contained in the product was also used.

[0032] Component (A) "Crodamol DES-LQ-(JP)" (manufactured by Croda Japan Co., Ltd.) Ingredients (B-1) "MacbioBride MG-20P" (manufactured by NOF Corp.) Ingredients (B-2) "MacbioBride MG-10E" (manufactured by NOF Corp.) Component (B'-1) "Diglycerin 801" (manufactured by Sakamoto Pharmaceutical Co., Ltd.) Component (B'-2) "PEG#4000" (NOF Corporation) Ingredients (C) "Phytoproteoglycan" (NOF Corporation) Component (C') "Hyaluronic Acid Liquid HA-LQH1P" (Kewpie Corporation)

[0033] <Evaluation method> Each test was evaluated for (1) ease of spreading when applied, (2) refreshing moisturizing feeling, and (3) feeling of penetration after rinsing with water, and rated into one of four levels based on the following criteria.

[0034] (1) Good spreadability when applied A panel of 20 women (aged 23 to 55) was used to evaluate the spreadability of aqueous skin cosmetics (hereinafter simply referred to as "skin cosmetics") when applied to the face. (Evaluation Criteria) 2 points: I felt that it spread well when applied. 1 point: I felt that it spread somewhat well when applied. 0 points: The product felt poorly spread when applied. (Judgment criteria) The total scores of the 20 participants were calculated and judged as follows: ⊚: Total score is 30 points or more: The skin cosmetic spreads well when applied. ◯: Total score is 20 points or more but less than 30 points: The skin cosmetic spreads fairly well when applied. Δ: Total score is 10 or more but less than 20 points: The skin cosmetic has slightly poor spreadability when applied. ×: Total score is less than 10 points: The skin cosmetic preparation has poor spreadability when applied.

[0035] (2) Refreshing moisturizing sensation A panel of 20 women (aged 23-55) evaluated the refreshing moisturizing sensation after applying the skin cosmetics to the face. (Evaluation Criteria) 2 points: I felt a refreshing moisturizing sensation. 1 point: Felt a slightly refreshing moisturizing sensation. 0 points: Did not feel refreshing and moisturizing. (Judgment criteria) The total scores of the 20 participants were calculated and judged as follows: ◎: Total score is 30 points or more: A skin cosmetic that is refreshing and moisturizing. ○: Total score is 20 points or more but less than 30 points: A skin cosmetic product with slightly refreshing moisturizing properties. △: Total score is 10 or more but less than 20 points: A skin cosmetic that is refreshing and not very moisturizing. ×: Total score is less than 10 points: The skin cosmetic has no refreshing moisturizing properties at all.

[0036] (3) Feeling of absorption immediately after washing the face with water Twenty women (aged 23-55) were asked to remain in a room with a room temperature of 30°C and humidity of 60% for 30 minutes and then lightly washed their faces with water before applying skin cosmetics and evaluating their penetration sensation. (Evaluation Criteria) 2 points: I felt it penetrated. 1 point: Some penetration was felt. 0 points: No penetration was felt. (Judgment criteria) The total scores of the 20 participants were calculated and judged as follows: ⊚: Total score is 30 points or more: The skin cosmetic product feels sufficiently absorbed even after rinsing with water. ○: Total score is 20 or more and less than 30 points: The skin cosmetic product has a feeling of penetration even after rinsing with water. △: Total score is 10 or more but less than 20 points: After rinsing with water, the skin cosmetic preparation does not feel like it penetrates very well. ×: Total score less than 10 points: The skin cosmetic preparation does not feel penetrated at all after rinsing with water.

[0037] [Table 1]

[0038] [Table 2]

[0039] In the Examples, all of the samples had excellent spreadability upon application and a refreshing moisturizing feeling, and the skin felt sufficiently absorbed even after washing a sweaty face with water. On the other hand, in Comparative Examples 1 to 5, sufficient effects were not obtained. That is, in Comparative Example 1, a component different from component (B) was used, so although there was a moisturizing feeling, there was stickiness and the finish was not refreshing. In Comparative Example 2, since a component different from component (B) was used, the coating sensation was somewhat strong and the penetration sensation was insufficient. In Comparative Example 3, since component (C) was not contained, the moisturizing feeling was insufficient. In Comparative Example 4, since component (A) was not contained, the refreshing moisturizing feeling and the feeling of penetration were insufficient. In Comparative Example 5, a component different from component (C) was used, and therefore the feeling of penetration was insufficient.

[0040] Examples of formulations of the aqueous skin cosmetic according to the present invention are given below, where BG is 1,3-butylene glycol, PEG is polyethylene glycol, and DPG is dipropylene glycol. [Formulation Example 1] Penetrating lotion (mass%) "Phytoproteoglycan" (NOF Corp.): 0.95 Polyoxypropylene methyl glucoside (20P.O.): 1.0 Diethoxyethyl succinate: 1.0 BG:17.0 Ethylhexylglycerin: 0.15 Glyceryl Caprylate: 0.15 Preservatives: appropriate amount pH adjuster: appropriate amount Water: Remaining Fragrance: Appropriate amount

[0041] [Formulation Example 2] Penetrating emulsion (mass%) "Phytoproteoglycan" (NOF Corp.): 0.1 Polyoxypropylene methyl glucoside (20P.O.): 1.0 Diethoxyethyl succinate: 3.0 Squalane: 1.0 Beeswax: 1.0 Glycosyl trehalose: 0.47 PEG-32:1.0 BG:5.0 DPG:5.0 Pentylene glycol: 2.0 Xanthan gum: 0.08 Carbomer: 0.14 Hydrogenated starch hydrolysate: 0.27 Arginine: 0.1 Polysorbate 80:0.3 Behenyl alcohol: 0.8 Glyceryl stearate: 0.75 PEG-75 stearate: 0.3 Phenoxyethanol: 0.3 Allantoin: 0.1 pH adjuster: appropriate amount Water: Remaining Fragrance: Appropriate amount

[0042] As with the Examples, Formulation Examples 1 and 2 were evaluated for (1) ease of spread upon application, (2) refreshing moisturizing sensation, and (3) penetration sensation after rinsing with water, and good results were obtained.

Claims

[Claim 1] An aqueous skin cosmetic preparation comprising the following components (A) in an amount of 0.1 to 10% by mass, (B) in an amount of 0.1 to 6% by mass, and (C) in an amount of 0.05 to 5% by mass. (A) Dicarboxylic acid diester of a dicarboxylic acid having 2 to 12 carbon atoms and a monohydric alcohol having 1 to 10 carbon atoms (B) An alkylene oxide derivative represented by the following formula [I] MG-[O(EO)x(PO)y-(BO)z] ４ ... Formula [I] (In the formula, MG is a residue obtained by removing a hydroxyl group from methyl glucoside. EO is an oxyethylene group, PO is an oxypropylene group, x and y are the average number of moles of EO and PO added, respectively, and 0≦x≦20, 1≦y≦10. When x is not 0, EO and PO are added randomly, and the mass ratio of PO to the total mass of EO and PO is 10 to 45 mass %. BO is an oxybutylene group, z is the average number of moles of BO added, and 0≦z≦4.) (C) Proteoglycan

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