Water-based cosmetics

Abstract

To provide an aqueous cosmetic which has good moisture-retaining properties and a sufficient antiseptic effect, good compatibility during application, less stickiness immediately after application and drying and an excellent moist feeling after application, is suitable for use after using a sunscreen cosmetic or a makeup cosmetic and has little change in appearance due to changes in temperature.SOLUTION: There is provided an aqueous cosmetic which comprises (a) 0.1 mass% to 3 mass% of one or more selected from the group consisting of dehydroacetic acid and its salt, (b) 0.1 mass% to 5 mass% of an alkylene oxide derivative represented by the following formula (1), (c) 5 mass% to 30 mass% of a polyhydric alcohol having 2 to 6 carbon atoms and (d) water, in which the content ratio [(b) / (a)] of the component (b) to the component (a) is 1 / 2 to 50 / 1 by mass, the content ratio [(b) / (c)] of the component (b) to the component (c) is 1 / 20 to 1 / 4 by mass. Z-[ O(EO)l(PO)m(AO)n-H]p (1) [The meanings of the symbols in the formula (1) are as described in the specification.]SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to an aqueous cosmetic having a good moisturizing effect and an antiseptic effect, being well-adhering during application, having little stickiness immediately after drying after application, being excellent in the moist feeling after application, and having little change in appearance due to temperature changes.

Background Art

[0002] In cosmetics, the compatibility of high moisturizing effect and good touch has been a long-standing problem, and many studies have been made so far. To enhance the moisturizing effect, it is effective to blend various types of polyhydric alcohols. However, when a high concentration of polyhydric alcohol is blended, there is a risk of deteriorating the touch surface such as stickiness during application. Therefore, alkylene oxide derivatives and the like have been developed as amphiphilic components for suppressing deterioration of touch such as stickiness. A cosmetic base having excellent touch and moisturizing property containing such an alkylene oxide derivative, and a cosmetic containing the cosmetic base and a water-soluble polyhydric alcohol have been proposed (Patent Document 1).

[0003] In addition, since cosmetics are used over a long period after opening, it is essential to have an antiseptic effect to suppress the growth and propagation of microorganisms. Therefore, it is common to blend preservatives such as paraoxybenzoic acid esters, phenoxyethanol, and isopropylmethylphenol in cosmetics. As a cosmetic composition in which the irritation caused by these preservatives is alleviated, a composition containing an acrylic copolymer having a specific structural unit has been proposed (Patent Document 2). However, in the cosmetics that achieve both the above-mentioned touch and moisturizing property, when the above-mentioned preservative and the above-mentioned alkylene oxide derivative are used in combination to improve the antiseptic effect, there may be a change in appearance when severe temperature changes are repeated. In addition, when the above-mentioned cosmetic is further applied after using a sunscreen cosmetic or a makeup cosmetic, the compatibility with the skin may not be sufficient, and there may be a deterioration in touch such as stickiness immediately after drying after application. In other words, conventionally, it has been difficult to obtain a cosmetic product that possesses both excellent texture and moisturizing properties, as well as sufficient preservative effects, and is suitable for use after applying sunscreen or makeup. [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] International Publication No. 2006 / 038724 [Patent Document 2] Japanese Patent Publication No. 2015-113298 [Overview of the project] [Problems that the invention aims to solve]

[0005] Therefore, the object of the present invention is to provide a cosmetic product that has good moisturizing and preservative effects, blends well when applied, is less sticky immediately after drying, provides excellent moisturizing properties after application, is suitable for use after using sunscreen or makeup, and undergoes little change in appearance due to temperature changes. [Means for solving the problem]

[0006] To solve the above problems, the inventors conducted diligent research and found that in an aqueous cosmetic composition containing one or more selected from the group consisting of dehydroacetic acid and its salts, a specific alkylene oxide derivative, and a water-soluble polyhydric alcohol in specific amounts and ratios, the change in appearance due to temperature changes is improved, and furthermore, even when used after using sunscreen or makeup, it blends well upon application and the stickiness immediately after drying is improved. After further research, the inventors completed the present invention.

[0007] In other words, the present invention relates to the following: [1] An aqueous cosmetic comprising (a) 0.1% to 3% by mass of one or more selected from the group consisting of dehydroacetic acid and its salts, (b) 0.1% to 5% by mass of an alkylene oxide derivative represented by the following formula (1), (c) 5% to 30% by mass of a polyhydric alcohol having 2 to 6 carbon atoms, and (d) water, wherein the content ratio of component (b) to component (a) [(b) / (a)] is 1 / 2 to 50 / 1 by mass, and the content ratio of component (b) to component (c) [(b) / (c)] is 1 / 20 to 1 / 4 by mass.

[0008] [ka]

[0009] [In formula (1), Z represents a residue obtained by removing p hydroxyl groups from a hydroxy compound having 1 to 12 carbon atoms, and p represents an integer from 1 to 9. EO represents an oxyethylene group, PO represents an oxypropylene group, AO represents an oxyalkylene group having 3 to 4 carbon atoms, and l, m, and n represent the average number of moles added of oxyethylene, oxypropylene, and oxyalkylene groups, respectively, with 1 ≤ p × l ≤ 50, 1 ≤ p × m ≤ 50, and 0 ≤ p × n ≤ 10.] [Effects of the Invention]

[0010] The present invention provides an aqueous cosmetic that has good moisturizing and preservative effects, blends well when applied, is less sticky immediately after drying, provides excellent moisturizing properties after application, is suitable for use after sunscreen or makeup, and undergoes minimal changes in appearance due to temperature changes. [Modes for carrying out the invention]

[0011] The present invention will be described in detail below.

[0012] The present invention provides an aqueous cosmetic composition. In this specification, "aqueous cosmetic composition" means a cosmetic composition that contains water and mainly contains water-soluble components and hydrophilic components. The aqueous cosmetic of the present invention contains (a) one or more selected from the group consisting of dehydroacetic acid and its salts, (b) an alkylene oxide derivative, (c) a polyhydric alcohol having 2 to 6 carbon atoms, and (d) water.

[0013] [Component (a)] In the aqueous cosmetic of the present invention, dehydroacetic acid (3-acetyl-6-methyl-2H-pyran-2,4(3H)-dione) contained as component (a) is also called dehydroacetic acid and is a compound represented by the following formula (2).

[0014] [Chemical formula]

[0015] The salt of dehydroacetic acid is not particularly limited as long as it is an acceptable salt in cosmetics or a pharmaceutically acceptable salt, and examples include alkali metal salts such as sodium salt and potassium salt, and ammonium salt. In the present invention, sodium dehydroacetate is particularly preferably used.

[0016] In the aqueous cosmetic of the present invention, as component (a), one kind may be selected from the group consisting of dehydroacetic acid and its salts and used alone, or two or more kinds may be selected and used in combination. Dehydroacetic acid and its salts can be produced by known production methods and used, but commercially available products provided by various companies for use in cosmetics can also be utilized.

[0017] The content of component (a) in the aqueous cosmetic of the present invention is 0.1% by mass to 3% by mass. When the content of component (a) is less than 0.1% by mass, the feel during application may not be sufficient. From the viewpoint of the feel during application of the aqueous cosmetic, the content of component (a) is preferably 0.2% by mass or more, and more preferably 0.5% by mass or more. Furthermore, if the content of component (a) exceeds 3% by mass, stickiness may occur immediately after drying after application, resulting in a less moisturizing effect after application. From the viewpoint of preventing such deterioration of the user experience, the content of component (a) is preferably 2% by mass or less, and more preferably 1% by mass or less.

[0018] [Component (b)] The alkylene oxide derivative contained as component (b) in the aqueous cosmetic composition of the present invention is represented by the following formula (1).

[0019] [ka]

[0020] [In formula (1), Z represents a residue obtained by removing p hydroxyl groups from a hydroxy compound having 1 to 12 carbon atoms, and p represents an integer from 1 to 9. EO represents an oxyethylene group, PO represents an oxypropylene group, AO represents an oxyalkylene group having 3 to 4 carbon atoms, and l, m, and n represent the average number of moles added of oxyethylene, oxypropylene, and oxyalkylene groups, respectively, with 1 ≤ p × l ≤ 50, 1 ≤ p × m ≤ 50, and 0 ≤ p × n ≤ 10.]

[0021] In formula (1), Z is a hydroxy compound having 1 to 12 carbon atoms (Z(OH) p It is a residue obtained by removing all hydroxyl groups from ), where p indicates the number of hydroxyl groups in the hydroxy compound, ranging from 1 to 9. The above hydroxy compound (Z(OH) p If the number of carbon atoms in the compound exceeds 12, stickiness may occur immediately after drying following application. From the standpoint of preventing such stickiness immediately after drying following application, hydroxy compounds (Z(OH) p The number of carbon atoms in the molecule is preferably 8 or less, and more preferably 6 or less. Also, the above hydroxy compound (Z(OH) p If the compound is an inorganic compound that does not contain carbon, the adhesion during application may decrease. From the standpoint of adhesion during application, hydroxy compounds (Z(OH) pThe carbon number of the element is preferably 2 or more, and more preferably 3 or more. Examples of the above-mentioned hydroxy compound (Z(OH)p) include methanol, ethanol, propylene glycol, glycerin, trimethylolpropane, erythritol, pentaerythritol, sorbitan, alkyl glucosides having an alkyl group with 1 to 6 carbon atoms, diglycerin, xylitol, dipentaerythritol, sorbitol, inositol, sucrose, trehalose, maltitol, etc. In preparing the alkylene oxide derivative represented by formula (1), one of these hydroxy compounds may be used, or a mixture of two or more may be used.

[0022] In formula (1), the oxyethylene group represented by EO originates from ethylene oxide, and in formula (1), l is the average number of moles of oxyethylene groups added per hydroxyl group of the alkylene oxide derivative. Therefore, the average number of moles of oxyethylene groups added in the alkylene oxide derivative is p × l. The average number of moles of oxyethylene groups added in alkylene oxide derivatives, p×l, is between 1 and 50. If the average number of moles of oxyethylene groups added in the alkylene oxide derivative (p × l) exceeds 50, stickiness may occur immediately after drying following application. From the viewpoint of preventing stickiness immediately after drying following application, the average number of moles of oxyethylene groups added (p × l) is preferably 20 or less, and more preferably 10 or less. Furthermore, if the average number of moles of oxyethylene groups added in the alkylene oxide derivative (p × l) is less than 1, the adhesion during application may be poor. From the viewpoint of adhesion during application, the average number of moles of oxyethylene groups added (p × l) is preferably 2 or more, and more preferably 5 or more.

[0023] In formula (1), the oxypropylene group represented by PO is an oxypropylene group derived from 1,2-propylene oxide, and m is the average number of moles of oxypropylene groups added per hydroxyl group of the alkylene oxide derivative. Therefore, the average number of moles of oxypropylene groups added in the alkylene oxide derivative is p × m. The average number of moles of oxypropylene groups added (p × m) in alkylene oxide derivatives is between 1 and 50. If the average number of moles of oxypropylene groups added in an alkylene oxide derivative (p × m) exceeds 50, the adhesion during application may deteriorate. From the viewpoint of adhesion during application, the average number of moles of oxypropylene groups added (p × m) is preferably 20 or less, and more preferably 10 or less. Furthermore, if the average number of moles of oxypropylene groups added in the alkylene oxide derivative (p × m) is less than 1, the effect of preventing changes in appearance may be inferior. From the viewpoint of preventing changes in appearance, the average number of moles of oxypropylene groups added (p × m) is preferably 2 or more, and more preferably 4 or more.

[0024] In formula (1), the oxyalkylene group having 3 to 4 carbon atoms represented by AO specifically includes oxypropylene group, oxytrimethylene group, oxybutylene group, oxyisobutylene group, and oxytetramethylene group derived from 1,2-propylene oxide, and is preferably an oxybutylene group derived from 1,2-butylene oxide. In formula (1), n ​​is the average number of moles of the oxyalkylene group added per hydroxyl group of the alkylene oxide derivative, and the average number of moles of the oxyalkylene group added in the alkylene oxide derivative is p × n. The average number of moles of oxyalkylene groups added in alkylene oxide derivatives, p × n, is between 0 and 10. The average number of moles of oxyalkylene groups added in the alkylene oxide derivative, p×n, may be 0, but from the viewpoint of compatibility during application, it is preferable that it be greater than 0, and more preferably 1 or more. Furthermore, if the average number of moles of oxyalkylene groups added in the alkylene oxide derivative, p × n, exceeds 10, the effect of preventing changes in appearance may be inferior. From the viewpoint of preventing changes in appearance, the average number of moles of oxyalkylene groups added, p × n, is preferably 5 or less, and more preferably 3 or less.

[0025] In the alkylene oxide derivative contained as component (b) in the aqueous cosmetic composition of the present invention, the order in which the oxyethylene group, oxypropylene group, and oxyalkylene group are added is not particularly specified, and they may be added in a block-like manner or in a random manner. That is, the oxyethylene group, oxypropylene group, and oxyalkylene group may all be added in a random manner, or one or more of the oxyethylene group, oxypropylene group, and oxyalkylene group may be added in a block-like manner. Furthermore, parts that are added in a block-like manner and parts that are added in a random manner may be mixed. In a particularly preferred embodiment of the present invention, oxyalkylene groups are added in a block-like manner. In another particularly preferred embodiment of the present invention, oxyethylene groups and oxypropylene groups are added in a random manner. In the alkylene oxide derivative represented by formula (1), any of the oxyethylene group, oxypropylene group, and oxyalkylene group may be bonded to the terminal hydrogen atom, but it is preferable that the oxyalkylene group is bonded to the terminal hydrogen atom.

[0026] The alkylene oxide derivative represented by formula (1) can be produced by known methods. In other words, hydroxy compound (Z(OH) p Ethylene oxide, propylene oxide (such as 1,2-propylene oxide), and alkylene oxides with 3 to 4 carbon atoms (such as 1,2-butylene oxide) are appropriately added to the given material. The order in which each monomer is added during addition polymerization can be determined according to the desired structure. Preferably, oxyalkylene blocks bonded to terminal hydrogen atoms can be generated by addition polymerization of ethylene oxide and propylene oxide to a hydroxy compound, followed by addition polymerization of alkylene oxide. When addition polymerization of ethylene oxide and propylene oxide, random polymerization of ethylene oxide and propylene oxide is permitted, or block polymerization of propylene oxide or ethylene oxide is permitted.

[0027] The content of component (b) in the aqueous cosmetic composition of the present invention is 0.1% to 5% by mass. If the content of component (b) is less than 0.1% by mass, the coating may not adhere well, stickiness may occur immediately after drying, and the effect of preventing changes in appearance may be inferior. From the viewpoint of adhesion during application, the content of component (b) is preferably 0.5% by mass or more, more preferably 1% by mass or more, and even more preferably 1.5% by mass or more. Furthermore, if the content of component (b) exceeds 5% by mass, stickiness may occur immediately after drying following application. From the viewpoint of suppressing stickiness immediately after drying following application, the content of component (b) is preferably 4.5% by mass or less, and more preferably 3% by mass or less.

[0028] [Component (c)] The polyhydric alcohol having 2 to 6 carbon atoms contained as component (c) in the aqueous cosmetic composition of the present invention is a water-soluble compound having 2 to 6 carbon atoms and possessing two or more hydroxyl groups in its molecule. Examples include dihydric alcohols having 2 to 6 carbon atoms such as ethylene glycol, propylene glycol, dipropylene glycol, 1,3-butylene glycol, pentanediol, isoprene glycol (3-methyl-1,3-butanediol), and hexanediol; trihydric alcohols having 3 carbon atoms such as glycerin and diglycerin, and their dimers; and sugar alcohols having 4 to 6 carbon atoms such as erythritol, treitol, arabinitol, xylitol, ribitol, isitol, galactitol, sorbitol, and mannitol. Preferably, it is a dihydric or trihydric alcohol having 2 to 6 carbon atoms, and specifically, glycerin, 1,3-butylene glycol, and dipropylene glycol are particularly preferred.

[0029] The content of component (c) in the aqueous cosmetic composition of the present invention is 5% to 30% by mass. If the content of component (c) is less than 5% by mass, stickiness may occur immediately after drying after application, resulting in a less moisturizing effect after application. From the viewpoint of preventing such deterioration of the feel after application, the content of component (c) is preferably 10% by mass or more, and more preferably 15% by mass or more. Furthermore, if the content of component (c) exceeds 30% by mass, the adhesion during application may be poor. From the viewpoint of adhesion during application, the content of component (c) is preferably 25% by mass or less, and more preferably 20% by mass or less.

[0030] [Component (d)] The aqueous cosmetic composition of the present invention contains water as component (d). As the water, water suitable for the manufacture of cosmetics, pharmaceuticals, etc., can be used, for example, ion-exchanged water or purified water can be used. The content of component (d) in the aqueous cosmetic composition of the present invention is calculated as 100% by mass of the total amount of the aqueous cosmetic composition containing the above-mentioned components (a), (b), and (c), as well as other components added as needed as described later.

[0031] [Content ratio of ingredients (a), (b), and (c)] The content ratio of component (b) to component (a) in the aqueous cosmetic composition of the present invention [(b) / (a)] is 1 / 2 to 50 / 1 by mass. If [(b) / (a)] is less than 1 / 2, the preventative effect against changes in appearance may be inferior. From the viewpoint of the preventative effect against changes in appearance, it is preferable that [(b) / (a)] be 1 / 1 or more, and more preferable that it be 3 / 1 or more. Furthermore, if [(b) / (a)] exceeds 50 / 1, the moisturizing effect after application may be inferior. From the viewpoint of moisturizing effect after application, [(b) / (a)] is preferably 10 / 1 or less, and more preferably 6 / 1 or less. The ratio of the content of component (b) to component (c) [(b) / (c)] is between 1 / 20 and 1 / 4 by mass. If [(b) / (c)] is less than 1 / 20, the adhesion during application may be poor. From the viewpoint of adhesion during application, [(b) / (c)] is preferably 1 / 15 or more, and more preferably 1 / 10 or more. Furthermore, if [(b) / (c)] exceeds 1 / 4, stickiness may occur immediately after drying following application. From the viewpoint of suppressing stickiness immediately after drying following application, it is preferable that [(b) / (c)] be 1 / 5 or less, and more preferably 1 / 6 or less.

[0032] In addition to the above-mentioned components (a), (b), and (c), general cosmetic additives may be added to the aqueous cosmetic composition of the present invention as needed, provided that the effects of the present invention are not impaired. Examples of such additives include monohydric lower alcohols, oils, sugars, polysaccharides, amino acids, various surfactants, organic salts, inorganic salts, pH adjusters, chelating agents, antioxidants, bactericides, blood flow promoters, anti-inflammatory agents, astringents, whitening agents, cell activators, UV absorbers, UV scattering agents, vitamins, pigments, fragrances, etc. These may be added in amounts commonly used depending on the purpose of each formulation.

[0033] The aqueous cosmetic composition of the present invention can be provided as skin cosmetics such as lotions, serums, emulsions, and creams; cleansing cosmetics such as cleansing lotions and cleansing creams; makeup cosmetics such as base lotions, base creams, and emulsion-type foundations; and body cosmetics such as body lotions and body creams, and can be provided more preferably as skin cosmetics such as lotions, serums, and emulsions.

[0034] The aqueous cosmetic composition of the present invention can be manufactured according to conventional formulation methods used depending on its form. For example, in the case of a lotion or serum, components (a), (b), and (c) can be mixed and uniformly dissolved, and then added to component (d) along with other additives and mixed to produce a uniform product.

[0035] The aqueous cosmetic composition of the present invention has good moisturizing and preservative effects, blends well when applied, is less sticky immediately after drying, provides excellent moisturizing after application, and undergoes little change in appearance due to temperature changes. In particular, the aqueous cosmetic composition of the present invention blends well when applied, even when used after sunscreen or makeup, and does not leave a sticky feeling immediately after drying, making it suitable for use after sunscreen or makeup. [Examples]

[0036] The present invention will be described in more detail below with reference to examples and comparative examples, but the present invention is not limited thereto.

[0037] [Synthesis examples b1-b3, b'1-b'4] Alkylene oxide derivatives First, an example of the synthesis of component (b) is shown below. One mole of the hydroxy compound shown in Table 1 and potassium hydroxide as a catalyst were charged into an autoclave in an amount equal to 0.1% by mass relative to the final amount of alkylene oxide derivative. After replacing the air in the autoclave with dry nitrogen, the catalyst was completely dissolved at 110°C while stirring. Next, a mixture of p × 1 moles of ethylene oxide and p × m moles of 1,2-propylene oxide was added dropwise from a dropping device. After the addition was complete, the reaction was allowed to proceed at 110°C for 3 hours. Subsequently, p × n moles of 1,2-butylene oxide were added dropwise to the autoclave from a dropping device. After the addition was complete, the reaction was allowed to proceed at 110°C for 2 hours. The reaction product was then removed from the autoclave, neutralized with hydrochloric acid to a pH of 6-7, and dehydrated at 50 mmHg and 100°C for 1 hour to remove water contained in the reaction product. Furthermore, filtration was performed to remove the neutralized salts generated by dehydration, yielding the alkylene oxide derivatives of synthesis examples b1, b2, and b3, as well as b'1, b'2, b'3, and b'4.

[0038] [Synthesis Example b4] Alkylene Oxide Derivatives One mole of glycerin as the hydroxy compound and potassium hydroxide as the catalyst were charged into an autoclave in an amount equal to 0.1% by mass relative to the final amount of alkylene oxide derivative. After replacing the air in the autoclave with dry nitrogen, the catalyst was completely dissolved at 110°C while stirring. Next, a mixture of 20 moles of ethylene oxide and 10 moles of 1,2-propylene oxide was added dropwise from a dropping device. After the addition was complete, the reaction was allowed to proceed at 110°C for 3 hours. The reaction product was then removed from the autoclave, neutralized with hydrochloric acid to a pH of 6-7, and dehydrated at 50 mmHg and 100°C for 1 hour to remove water contained in the reaction product. Furthermore, the mixture was filtered to remove the neutralization salt produced by dehydration, and the compound of Synthesis Example b4 was obtained as the alkylene oxide derivative.

[0039] [Synthesis Example b5] Alkylene Oxide Derivatives One mole of sucrose as a hydroxy compound and potassium hydroxide as a catalyst were charged into an autoclave in an amount equal to 0.1% by mass relative to the final amount of alkylene oxide derivative. After replacing the air in the autoclave with dry nitrogen, the catalyst was completely dissolved at 110°C with stirring. Next, 48 moles of 1,2-propylene oxide were added dropwise from a dropping device, and the reaction was allowed to proceed at 110°C for 2 hours after the completion of the addition. Subsequently, 10 moles of ethylene oxide were added dropwise from the dropping device, and the reaction was allowed to proceed at 110°C for 1 hour after the completion of the addition. Then, 8 moles of 1,2-butylene oxide were added dropwise from the dropping device, and the reaction was allowed to proceed at 110°C for 2 hours after the completion of the addition. The reaction product was then removed from the autoclave, neutralized with hydrochloric acid to a pH of 6-7, and dehydrated at 50 mmHg and 100°C for 1 hour to remove water contained in the reaction product. Furthermore, the product was filtered to remove the neutralization salt produced by dehydration, and the compound of Synthesis Example b5 was obtained as the alkylene oxide derivative.

[0040] [Table 1]

[0041] [Examples 1-7, Comparative Examples 1-9] Aqueous Cosmetics According to the formulations shown in Table 2, components (a), (b), and (c) were mixed and dissolved uniformly, then added to component (d) and mixed and stirred until homogeneous to prepare the aqueous cosmetic compositions of Examples 1 to 7. Component (b) used was the same as that used in the above synthesis examples b1 to b5. Furthermore, according to the formulations shown in Table 3, component (a) or (a'), component (b) or (b'), and component (c) were mixed and uniformly dissolved, then added to component (d) and mixed and stirred until homogeneous to prepare aqueous cosmetic compositions of Comparative Examples 1 to 9. Component (b) was the above-mentioned synthesis example b2, and component (b') was the above-mentioned synthesis examples b'1 to b'4. In the preparation of the aqueous cosmetic compositions of the above examples and comparative examples, commercially available products for cosmetic use were used as components (a), (a'), and (c).

[0042] For each aqueous cosmetic composition in Examples 1-7 and Comparative Examples 1-9, a usage test was conducted as described below, and the changes in appearance due to temperature changes were observed and evaluated.

[0043] 1. Testing A usage test was conducted with 20 female panelists (ages 25-50). Specifically, in a room with a temperature of 25°C and a relative humidity of 50%, a commercially available sunscreen cosmetic was first applied to the inside of the forearm. After 30 minutes, 0.2g of each aqueous cosmetic from the example and comparative examples was taken and applied to the inside of the forearm. Each panelist was asked to evaluate the following on a 4-point scale from 0 to 3 points according to the absolute evaluation criteria below: (1) how well it blended upon application, (2) the stickiness immediately after the moisture of the applied aqueous cosmetic dried, and (3) the moisturizing effect after application. The total scores from the 20 panelists were then evaluated on a 5-point scale from "AA" to "D" based on the criteria below, and a rating of "AA", "A", or "B" was considered a pass. <Evaluation criteria based on the total score of 20 people> AA: The total score is between 50 and 60 points. A: The total score is between 40 and 49 points. B: The total score is between 30 and 39 points. C: The total score is between 20 and 29 points. D: The total score is less than 20 points.

[0044] (1) Good adherence when applied The ease of absorption felt immediately after applying each aqueous cosmetic composition from the examples and comparative examples to the inner forearm was evaluated using the following absolute evaluation criteria. <Absolute evaluation criteria> 3 points: It blends in extremely well when applied. 2 points: It blends well when applied. 1 point: It doesn't blend very well when applied. 0 points: Poor adhesion during application.

[0045] (2) Stickiness immediately after the water in the applied water-based cosmetic has dried. After applying each aqueous cosmetic composition from the examples and comparative examples to the inner side of the forearm, participants were asked to spread it with their fingers and perform a sensory evaluation of the stickiness felt immediately after the moisture dried, according to the absolute evaluation criteria below. <Absolute evaluation criteria> 3 points: No stickiness at all. 2 points: I hardly feel any stickiness. 1 point: It feels slightly sticky. 0 points: Clearly feels sticky.

[0046] (3) Moisturizing effect after application After applying each aqueous cosmetic composition of the Examples and Comparative Examples to the inner forearm, and spreading it with a finger, the feeling of moisture was evaluated 30 minutes after the moisture had dried, according to the absolute evaluation criteria below. <Absolute evaluation criteria> 3 points: Feels moisturizing. 2 points: I feel a slight moisturizing effect. 1 point: I hardly feel any moisturizing effect. 0 points: Does not feel moisturizing.

[0047] 2. Changes in appearance due to temperature changes Each aqueous cosmetic composition from the examples and comparative examples was left to stand in a test chamber with a 6-hour cycle at -5°C to 60°C for 3 months. After 3 months, the condition was visually observed and evaluated according to the following evaluation criteria. <Evaluation Criteria> ○: Transparent and uniform ×: Separation or precipitation of contained components is observed.

[0048] The results of the above usage tests and evaluations of changes in appearance due to temperature changes are shown in Tables 2 and 3.

[0049] [Table 2]

[0050] As shown in Table 2, the aqueous cosmetic compositions of Examples 1 to 7 received a rating of "B" or higher in all evaluation items, including ease of application, stickiness immediately after drying, and moisturizing effect after application, and no changes in appearance due to temperature changes were observed. In particular, the aqueous cosmetic composition of Example 2, which contains 2.0% by mass of the alkylene oxide derivative of Synthesis Example b2, which is a derivative obtained by adding an alkylene oxide to glycerin, with an average number of added moles of oxyethylene groups (p × l) of 8, an average number of added moles of oxypropylene groups (p × m) of 5, and the oxyalkylene group being an oxybutylene group with an average number of added moles (p × n) of 3, and which has a mass ratio of content of component (b) to component (a) [(b) / (a)] of 4 / 1 and a mass ratio of content of component (b) to component (c) [(b) / (c)] of 1 / 10, received an "AA" rating in all items of the usage test.

[0051] [Table 3]

[0052] On the other hand, none of the aqueous cosmetics in Comparative Examples 1 to 9 passed all evaluation items, including ease of application, stickiness immediately after drying, and moisturizing effect after application. Except for the aqueous cosmetics in Comparative Examples 1 and 3, changes in appearance due to temperature changes were observed. In other words, as shown in Table 3, the aqueous cosmetic composition of Comparative Example 1, which did not contain ingredient (a), was evaluated as having a slightly sticky feeling immediately after drying following application, and the moisturizing effect after application was deemed insufficient. Comparative Example 2, an aqueous cosmetic composition containing methyl parahydroxybenzoate as component (a') instead of component (a), was evaluated as having insufficient blendability and moisturizing properties upon application, and a slight stickiness was felt immediately after drying. Changes in appearance due to temperature changes were also observed. Comparative Example 3, an aqueous cosmetic composition containing methyl parahydroxybenzoate as component (a') instead of component (a) and with a component (b) content exceeding 5% by mass, was evaluated as having insufficient blendability upon application and a sticky feeling immediately after drying. Comparative Example 4, an aqueous cosmetic composition containing isopropylmethylphenol as component (a') instead of component (a), was evaluated as lacking good absorption during application and a moist feeling after application, and was found to be sticky immediately after drying. Changes in appearance due to temperature changes were also observed. Comparative Example 5, an aqueous cosmetic containing the alkylene oxide derivative of Synthesis Example b'1, in which the average number of moles of oxyethylene groups added (p × l) and the average number of moles of oxypropylene groups added (p × m) exceeds 50, instead of component (b), was evaluated as not blending well upon application, providing insufficient moisture after application, and showing changes in appearance due to temperature changes. In the aqueous cosmetic of Comparative Example 6, which contains the alkylene oxide derivative of Synthesis Example b'2 with an average number of added moles of oxyalkylene groups (p × n) exceeding 10 instead of component (b); the aqueous cosmetic of Comparative Example 7, which contains the alkylene oxide derivative of Synthesis Example b'3 with an average number of added moles of oxyethylene groups (p × l) exceeding 50; and the aqueous cosmetic of Comparative Example 8, which contains the alkylene oxide derivative of Synthesis Example b'4 with an average number of added moles of oxypropylene groups (p × m) exceeding 50, the good blendability and moisturizing effect upon application were not felt or were insufficient, and stickiness was felt immediately after drying after application. Changes in appearance due to temperature changes were also observed. Comparative Example 9, an aqueous cosmetic composition containing sodium dehydroacetate as component (a) and the alkylene oxide derivative of Synthesis Example b2 as component (b), but with a content of component (a) exceeding 3% by mass, a content of component (b) exceeding 5% by mass, and a content of component (c) exceeding 30% by mass, was evaluated as lacking good absorption and moisturizing properties upon application, feeling sticky immediately after drying, and exhibiting changes in appearance due to temperature changes. [Industrial applicability]

[0053] As described in detail above, the present invention provides an aqueous cosmetic that has good moisturizing and preservative effects, blends well when applied, is less sticky immediately after drying, provides excellent moisturizing properties after application, and undergoes little change in appearance due to temperature changes. In particular, the aqueous cosmetic composition of the present invention is suitable for use after applying sunscreen or makeup.

Claims

[Claim 1] An aqueous cosmetic composition comprising: (a) 0.1% to 3% by mass of one or more selected from the group consisting of dehydroacetic acid and its salts; (b) 0.1% to 5% by mass of an alkylene oxide derivative represented by the following formula (1); (c) 5% to 30% by mass of a polyhydric alcohol having 2 to 6 carbon atoms; and (d) water, wherein the content ratio of component (b) to component (a) [(b) / (a)] is 1 / 2 to 50 / 1 by mass, and the content ratio of component (b) to component (c) [(b) / (c)] is 1 / 20 to 1 / 4 by mass. 【Chemistry 1】 [In formula (1), Z represents a residue obtained by removing p hydroxyl groups from a hydroxy compound having 1 to 12 carbon atoms, and p represents an integer from 1 to 9. EO represents an oxyethylene group, PO represents an oxypropylene group, AO represents an oxybutylene group derived from 1,2-butylene oxide, and l, m, and n represent the average number of moles added of the oxyethylene group, oxypropylene group, and oxybutylene group derived from 1,2-butylene oxide, respectively, with 1 ≤ p × l ≤ 50, 1 ≤ p × m ≤ 50, and 0 ≤ p × n ≤ 10.]

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