Skin cosmetics

Abstract

To provide a skin cosmetic which has a refreshing feeling upon application, has an excellent moist feeling after removing a mask after long time use and suppresses shininess and sticky feeling of oily skin after wearing a mask for an extended period of time.SOLUTION: There is provided a skin cosmetic which comprises 0.1 to 25 mass% of a component (a), 0.01 to 3 mass% of a component (b), 0.1 to 25 mass% of a component (c) and a component (d), wherein the mass ratio ((b) / (a)) of the component (b) to the component (a) is 1 / 100 to 1 / 5. (a) A polyalkylene oxide derivative represented by the formula (1), Z-[O(AO)l(EO)m(BO)n-H]p (1). (b) An alkylene oxide derivative represented by the formula (2), R-[(PO)x(EO)y]q-H (2). (c) A polyhydric alcohols having 2 to 6 carbon atoms. (d) water.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a skin cosmetic that provides a refreshing feel upon application, offers excellent moisturizing properties after removing a mask worn for an extended period, and effectively suppresses shine and stickiness for people with oily skin for a long time. [Background technology]

[0002] Maintaining the skin's moisture balance is said to be crucial for healthy skin. Moisture balance refers to the balance of water, sebum, and natural moisturizing factors (NMF) in the stratum corneum of the skin. Applying cosmetics to the skin to replenish these three components—water, moisturizers, and oils—is important for maintaining moisture balance.

[0003] To date, various moisturizing ingredients and cosmetics containing several types of moisturizing ingredients have been developed to prevent skin dryness. Patent Document 1 reports that cosmetics containing a specific alkylene oxide derivative have excellent moisturizing effects and do not leave a sticky feeling.

[0004] According to Patent Document 2, a cosmetic formulation containing ceramides, specific compounds such as butyl alcohol, and specific alkylene oxide derivatives is disclosed to reduce the feeling of a film on the skin, provide a refreshing feel, and offer excellent sustained moisturizing effects. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] WO2006 / 038724 A1 [Patent Document 2] Japanese Patent Publication No. 2021-80234 [Overview of the project] [Problems that the invention aims to solve]

[0006] Maintaining moisture balance requires selecting the optimal cosmetic product according to the external environment. In recent years, the need to wear masks due to the spread of infectious diseases has led to significant changes in the skin's external environment throughout the day. In particular, prolonged mask wear increases humidity inside the mask, but when the mask is removed, the moisture inside the mask evaporates, causing rapid evaporation of moisture from within the skin and leading to dryness. To maintain moisture balance even in situations where rapid moisture evaporation occurs, it is necessary to include a high concentration of moisturizers and oils. However, this can result in problems such as a sticky feeling upon application, a loss of the refreshing feeling upon application, and shininess for people with oily skin.

[0007] In contrast, the cosmetic composition described in Patent Document 1 failed to suppress stickiness for an extended period, and its moisturizing effect in the rapid evaporation of moisture when the mask is removed was also insufficient.

[0008] Furthermore, the cosmetic product described in Patent Document 2 did not adequately address the issue of rapid moisture evaporation when the mask was removed, and it also had the problem of causing greasiness in people with oily skin.

[0009] The object of the present invention is to provide a skin cosmetic that has a refreshing feel when applied, provides excellent moisturizing properties after removing a mask after wearing it for a long time, and suppresses shine and stickiness for a long time in people with oily skin after wearing a mask. [Means for solving the problem]

[0010] To solve the above problems, the present inventors have found that a skin cosmetic composition obtained by combining the two specific alkylene oxide derivatives and polyhydric alcohols in a specific ratio completely solves the above problems.

[0011] In other words, the present invention is as follows. (1) A skin cosmetic comprising 0.1 to 25% by mass of component (a), 0.01 to 3% by mass of component (b), 0.1 to 25% by mass of component (c), and component (d), wherein the mass ratio of component (b) to component (a) ((b) / (a)) is 1 / 100 to 1 / 5. (a) Polyalkylene oxide derivatives represented by the following formula (1) Z-[O(AO) l (EO) m (BO) n -H] p ...(1) (In formula (1), Z is an alcohol with 3 to 9 carbon atoms. or sucrose It is a residue from which all hydroxyl groups have been removed. p is the aforementioned alcohol or sucrose The valence is 3 or greater and 9 or less. AO is an oxyalkylene group having 3 to 4 carbon atoms, EO is an oxyethylene group, and BO is an oxybutylene group. The oxyalkylene group AO, the oxyethylene group EO, and the oxybutylene group BO may be attached in a block-like or random manner. However, if at least the oxyalkylene group AO and the oxybutylene group BO are attached in a random manner, AO is an oxypropylene group. In the derivative, the average number of moles of the oxyalkylene group AO added, p × l, satisfies 1 ≤ p × l ≤ 50; the average number of moles of the oxyethylene group EO added, p × m, satisfies 1 ≤ p × m ≤ 50; the average number of moles of the oxybutylene group BO added, p × n, satisfies 1 ≤ p × n ≤ 10; and the ratio of the average number of moles of the oxyethylene group EO added to the sum of the average number of moles of the oxyalkylene group AO and the average number of moles of the oxyethylene group EO added, m / (l + m), is between 0.15 and 0.75. (b) Alkylene oxide derivatives represented by the following formula (2) R-[O(PO)x(EO)yH]q ··· (2) (In formula (2), R is a residue obtained by removing all hydroxyl groups from an alcohol having 2 to 3 carbon atoms, q is the valency of the alcohol, which is 2 or more and 3 or less, PO is an oxypropylene group, EO is an oxyethylene group, the average number of moles x×q of the oxypropylene group PO added to the derivative satisfies 1≦x×q≦30, the average number of moles y×q of the oxyethylene group EO added to the derivative satisfies 1≦y×q≦40, the ratio y / (x + y) of the average number of moles of the oxyethylene group EO to the total of the average number of moles of the oxypropylene group PO and the average number of moles of the oxyethylene group EO is 0.45 to 0.75, the oxypropylene group PO and the oxyethylene group EO are added randomly.) (c) A polyhydric alcohol having 2 to 6 carbon atoms (d) Water [Advantages of the Invention]

[0012] According to the skin cosmetic of the present invention, it has a refreshing feeling when applied, is excellent in the moist feeling after removing the mask after wearing it for a long time, and can suppress the greasiness and stickiness of people with oily skin after wearing the mask for a long time. [Embodiments for Carrying Out the Invention]

[0013] Hereinafter, the present invention will be described in detail. [Component (a)] Component (a) is an alkylene oxide derivative represented by formula (1), Z is a residue obtained by removing all hydroxyl groups from an alcohol having 3 to 9 carbon atoms (Z(OH) p ), and p represents the valency of the alcohol, which is 3 to 9. The alcohol (Z(OH) pIf the number of carbon atoms exceeds 9, a sticky feeling will occur, so it should be 9 or less, preferably 8 or less, and more preferably 6 or less. Also, alcohol (Z(OH) p If the number of carbon atoms in the compound is less than 3, the firmness will decrease, so it should be 3 or more.

[0014] The aforementioned alcohol (Z(OH) p These include, specifically, glycerin, trimethylolpropane, erythritol, pentaerythritol, sorbitan, alkyl glucoside, diglycerin, xylitol, dipentaerythritol, sorbitol, inositol, sucrose, trehalose, maltitol, and mixtures thereof.

[0015] AO is an oxyalkylene group having 3 to 4 carbon atoms, specifically an oxypropylene group derived from propylene oxide, an oxybutylene group derived from 1,2-butylene oxide, an oxytrimethylene group, etc. Preferably, it is an oxypropylene group or an oxybutylene group, and more preferably an oxypropylene group.

[0016] l is the average number of moles of AO added per hydroxyl group of the alkylene oxide derivative. Therefore, the average number of moles of AO added in the alkylene oxide derivative is p × l. If p × l exceeds 50, the refreshing feeling upon application will be impaired, so it should be 50 or less, but preferably 20 or less. Also, if p × l is less than 1, the skin will become shiny, so it should be 1 or more, but preferably 2 or more.

[0017] m is the average number of moles of ethylene oxide (EO) added per hydroxyl group of the alkylene oxide derivative. Therefore, the average number of moles of AO added in the alkylene oxide derivative is p × m. If p × m exceeds 50, a sticky feeling will occur, so p × m should be 50 or less, but preferably 20 or less. Also, if p × m is less than 1, the moist feeling after removing the mask will be impaired, so it should be 1 or more, but preferably 2 or more.

[0018] n is the average number of moles of oxybutylene groups (BO) added per hydroxyl group of the alkylene oxide derivative. The oxybutylene group (BO) is an oxybutylene group derived from 1,2-butylene oxide. If the average number of moles of BO added in the alkylene oxide derivative, p×n, is less than 1, the refreshing feeling will be inferior, so it should be 1 or greater. Also, if p×n exceeds 10, a sticky feeling will occur, so it should be 10 or less, but preferably 5 or less. The ratio of the average number of moles of oxyalkylene groups AO added to the sum of the average number of moles of oxyethylene groups EO added (l+m), "m / (l+m)", should be between 0.15 and 0.75. If this ratio "m / (l+m)" exceeds 0.75, a sticky feeling will occur, so it should be 0.75 or less, preferably 0.72 or less, and more preferably 0.70 or less. Also, if the ratio "m / (l+m)" is less than 0.15, the moist feeling after removing the mask will be impaired, so it should be 0.15 or more, preferably 0.30 or more, and more preferably 0.45 or more.

[0019] There is no particular order in which AO, EO, and BO are added; they may be added in a block pattern or randomly. That is, AO, EO, and BO may all be added randomly, or AO may be added in a block pattern, EO may be added in a block pattern, or BO may be added in a block pattern. Also, parts that are added in a block pattern and parts that are added randomly may be mixed. However, if at least (AO) and (BO) are added randomly, AO is an oxypropylene group. Here, if (AO) and (BO) are added randomly, (EO) may also be added randomly along with (AO) and (BO), or (EO) may be added in a block pattern. In a particularly preferred embodiment, (BO) is added in a block-like manner. In another particularly preferred embodiment, AO and EO are added randomly. In formula (1), AO may be bonded to a terminal hydrogen atom, EO may be bonded to a terminal hydrogen atom, and BO may be bonded to a terminal hydrogen atom. In a preferred embodiment, BO is bonded to a terminal hydrogen atom.

[0020] The alkylene oxide derivative of formula (1) of the present invention can be produced by a known method.

[0021] That is, an alkylene oxide (AO) having 3 to 4 carbon atoms, ethylene oxide (EO), and butylene oxide (BO) are appropriately addition-polymerized to a compound having a hydroxyl group. The addition order of each monomer during the addition polymerization is determined by the target structure. In a preferred embodiment, an alkylene oxide (AO) having 3 to 4 carbon atoms and ethylene oxide (EO) are addition-polymerized to a compound having a hydroxyl group. At this time, AO and EO may be randomly polymerized, AO may be block-polymerized, or EO may be block-polymerized. Then, after the addition polymerization of AO and EO, by adding BO for addition polymerization, a BO block bonded to a terminal hydrogen atom can be generated.

[0022] When the total mass of component (a), component (b), component (c), and component (d) is 100% by mass, the content of component (a) is 0.1 to 25% by mass. When the content of component (a) is less than 0.1% by mass, the refreshing feeling is not sufficient and the moist feeling after removing the mask is impaired, so it is 0.1% by mass or more, preferably 0.5% by mass or more, more preferably 1% by mass or more, and particularly preferably 2% by mass or more. When the content of component (a) exceeds 25% by mass, stickiness occurs for a long time, so it is 25% by mass or less, preferably 20% by mass or less, more preferably 15% by mass or less, and particularly preferably 10% by mass or less.

[0023] [Component b] In the present invention, in the alkylene oxide derivative represented by formula (2), R is an alcohol having 1 to 3 carbon atoms (R(OH) qIt is a residue obtained by removing all hydroxyl groups from ), where q indicates the valency of the alcohol, and is between 2 and 3. The aforementioned alcohol (R(OH) q If the number of carbon atoms in the compound exceeds 3, a sticky feeling will occur.

[0024] PO is an oxypropylene group. x is the average number of moles of PO added per hydroxyl group of the alkylene oxide derivative. The average number of moles of PO added in the alkylene oxide derivative is q × x. If q × x is less than 1, the skin will become shiny, so it should be 1 or more, but it is even more preferable to be 3 or more. Also, if q × x exceeds 30, the refreshing feeling upon application will be impaired, so it should be 30 or less, but it is even more preferable to be 10 or less.

[0025] y is the average number of moles of EO added per hydroxyl group of the alkylene oxide derivative. The average number of moles of EO added in the alkylene oxide derivative is q × y. If q × y exceeds 40, a sticky feeling will occur, so it should be 40 or less, but 10 or less is even more preferable. Also, if q × y is less than 1, the moist feeling after removing the mask will be impaired, so it should be 1 or more, but 3 or more is even more preferable.

[0026] The ratio "y / (x+y)" of the average number of moles of oxyethylene groups EO added to the sum of the average number of moles of oxypropylene groups PO and the average number of moles of oxyethylene groups EO added shall be between 0.45 and 0.75. If "y / (x+y)" exceeds 0.75, a sticky feeling will occur, so it should be 0.75 or less, preferably 0.70 or less, and more preferably 0.65 or less. Also, if "y / (x+y)" is less than 0.15, the moist feeling after removing the mask will be impaired, so it should be 0.15 or more, preferably 0.30 or more, and more preferably 0.45 or more.

[0027] The oxypropylene group (PO) and oxyethylene group (EO) are added randomly to create a refreshing feel.

[0028] The alkylene oxide derivative of formula (2) of the present invention can be produced by known methods. For example, it can be obtained by reacting a compound having a hydroxyl group with propylene oxide (PO) and ethylene oxide (EO).

[0029] When the total mass of components (a), (b), (c), and (d) is 100% by mass, the content of component (b) should be 0.01 to 3% by mass. If the content of component (b) is less than 0.01% by mass, the refreshing feeling will not be sufficient and the moist feeling after removing the mask will be impaired, so it should be 0.01% by mass or more. Also, if the content of component (b) exceeds 3% by mass, stickiness will persist for a long time, so it should be 3% by mass or less, preferably 2% by mass or less, and more preferably 0.5% by mass or less.

[0030] [Component (c)] The component (c) of the present invention, a polyhydric alcohol having 2 to 6 carbon atoms, is a water-soluble compound having two or more hydroxyl groups in its molecule, such as propylene glycol, dipropylene glycol, isoprene glycol, 1,3-butylene glycol, pentanediol, hexanediol, glycerin, and diglycerin. Preferably, it is a water-soluble polyhydric alcohol having 2 to 3 carbon atoms, and specifically, glycerin and 1,3-butylene glycol are particularly preferred.

[0031] When the total mass of components (a), (b), (c), and (d) is taken as 100% by mass, the content of component (c) should be between 0.01% and 25% by mass. If the content of component (c) is less than 0.01% by mass, the refreshing feeling will not be sufficient and the moist feeling after removing the mask will be impaired, so it should be 0.01% by mass or more, but 3.0% by mass or more is preferable. Also, if the content of component (c) exceeds 25% by mass, stickiness will persist for a long time, so it should be 25% by mass or less, but 10% by mass or less is even more preferable.

[0032] [Component (d)] Component (d) of the present invention is water, and water commonly used in cosmetics, pharmaceuticals, etc., can be used. For example, ion-exchanged water or purified water can be used. The content of component (d) is the remainder obtained by subtracting the total content of components (a), (b), and (c) from 100% by mass.

[0033] [Ratio of each component] In this invention, the mass ratio of component (b) to component (a), ((b) / (a)), is set to 1 / 100 to 1 / 5. If ((b) / (a)) is less than 1 / 100, the skin will become shiny, so it should be 1 / 100 or more. Also, if ((b) / (a)) is greater than 1 / 5, the refreshing feeling will be inferior and stickiness will persist for a long time, so it should be 1 / 5 or less, but 1 / 10 is preferred, and 1 / 50 is even more preferred.

[0034] In addition to the above components (a) to (d), the cosmetic composition of the present invention may preferably further contain the following component (e). This will make the effects of the present invention even more pronounced. [Component (e)] Component (e) is a water-soluble thickener, and examples include natural polysaccharides such as carrageenan, xanthan gum, dextrin, methylcellulose, hyaluronic acid, and chitosan; semi-synthetic polysaccharides such as ethylcellulose, hydroxyethylcellulose, and hydroxypropylcellulose; and synthetic polymers such as polyvinyl alcohol, polyacrylic acid, polymethacrylic acid, carboxyvinyl polymer, and (acrylic acid / alkyl acrylate (10-30 carbon atoms) copolymer). Of these, xanthan gum, hydroxypropyl methylcellulose, carboxyvinyl polymer, and (acrylic acid / alkyl acrylate (10-30 carbon atoms) copolymer are preferred from the viewpoint of makeup retention and non-stickiness.

[0035] When the skin cosmetic composition of the present invention contains component (e), the content of component (e) is preferably 0.01 to 5% by mass, more preferably 0.05 to 4% by mass, and even more preferably 0.1 to 3% by mass, based on the total amount of the cosmetic composition.

[0036] Other ingredients may be added to the skin cosmetic composition of the present invention, as long as they do not impair the effects of the invention. Other optional ingredients include alcohols, sugars, polysaccharides, amino acids, various surfactants, organic salts, inorganic salts, and p H regulators, chelating agents, antioxidants, bactericides, blood flow promoters, anti-inflammatory agents, UV absorbers, UV scatterers, vitamins, pigments, fragrances, etc., can be added as appropriate. [Examples]

[0037] 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.

[0038] (Synthesis examples a1, a2, a3, a'1, a'2, a'3, a'4) As shown in Table 1, 1 mole of alcohol and 0.1% by mass of potassium hydroxide as a catalyst relative to the final weight of the alkylene oxide derivative were charged into an autoclave. 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 propylene oxide and p × m moles of ethylene 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 the 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 pH 6-7, and then dehydrated at -0.095 MPa (50 mmHg) and 100°C to remove any remaining water. The mixture was dehydrated for 1 hour. Furthermore, filtration was performed to remove the neutralized salts generated by dehydration, yielding the compounds of synthesis examples a1, a2, a3, a'1, a'2, a'3, and a'4.

[0039] (Synthesis example a4) One mole of glycerin and 0.1% by mass of potassium hydroxide as a catalyst relative to the final weight of the alkylene oxide derivative were charged into an autoclave. After replacing the air in the autoclave with dry nitrogen, the catalyst was completely dissolved at 110°C while stirring. Next, a mixture of three moles of 1,2-butylene oxide and three moles of ethylene oxide was added dropwise from a dropping device. After the addition was complete, the mixture was reacted at 110°C for 3 hours. Subsequently, 1.5 moles of 1,2-butylene oxide were added dropwise to the autoclave from the dropping device. After the addition was complete, the mixture was reacted at 110°C for 2 hours. The reaction product was then removed from the autoclave, neutralized with hydrochloric acid to pH 6-7, and dehydrated at -0.095 MPa (50 mmHg) and 100°C for 1 hour to remove the contained water. Furthermore, the mixture was filtered to remove the neutralized salt produced by dehydration, and the compound of synthesis example a4 was obtained.

[0040] (Synthesis example a5) One mole of sucrose and 0.1% by mass of potassium hydroxide as a catalyst relative to the final weight of the alkylene oxide derivative were charged into an autoclave. After replacing the air in the autoclave with dry nitrogen, the catalyst was completely dissolved at 110°C with stirring. Next, 48 moles of propylene oxide were added dropwise from a dropping device. The reaction was allowed to proceed for 2 hours after the completion of the dropwise addition. Subsequently, 10 moles of ethylene oxide were added dropwise from the dropping device. The reaction was allowed to proceed at 110°C for 1 hour after the completion of the dropwise addition. Subsequently, 8 moles of 1,2-butylene oxide were added dropwise to the autoclave from the dropping device. The reaction was allowed to proceed at 110°C for 2 hours after the completion of the dropwise addition. The reaction product was then removed from the autoclave, neutralized with hydrochloric acid to pH 6-7, and diluted to -0.095 to remove any contained water. The mixture was dehydrated at MPa (50 mmHg) and 100°C for 1 hour. Furthermore, filtration was performed to remove the neutralized salts generated by dehydration, yielding the compound of synthesis example a5.

[0041] (Synthesis examples b1, b2, b3) One mole of the alcohol shown in Table 2 and 0.1% by mass of potassium hydroxide as a catalyst relative to the final weight of the alkylene oxide derivative were charged into an autoclave. After replacing the air in the autoclave with dry nitrogen, the catalyst was completely dissolved at 110°C while stirring. Next, a mixture of q × x moles of propylene oxide and q × y moles of ethylene 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 pH 6-7, and dehydrated at -0.095 MPa (50 mmHg) and 100°C for 1 hour to remove any remaining water. Furthermore, the mixture was filtered to remove the neutralized salts produced by dehydration, yielding the compounds of synthesis examples b1, b2, and b3.

[0042] (Synthesis example b'1) One mole of sorbitol and 0.1% by mass of potassium hydroxide as a catalyst relative to the final weight of the alkylene oxide derivative were charged into an autoclave. After replacing the air in the autoclave with dry nitrogen, the catalyst was completely dissolved at 110°C while stirring. Next, 12 moles of propylene oxide were added dropwise from a dropping device. The reaction was allowed to proceed for 2 hours after the completion of the dropwise addition. The reaction product was then removed from the autoclave, neutralized with hydrochloric acid to pH 6-7, and dehydrated at -0.095 MPa (50 mmHg) and 100°C for 1 hour to remove any remaining water. Furthermore, the product was filtered to remove the neutralized salt produced by dehydration, yielding the compound of synthesis example b'1.

[0043] (Synthesis example b'2) One mole of glycerin and 0.1% by mass of potassium hydroxide as a catalyst relative to the final weight of the ethylene oxide derivative were charged into an autoclave. After replacing the air in the autoclave with dry nitrogen, the catalyst was completely dissolved at 110°C while stirring. Next, 12 moles of ethylene oxide were added dropwise from a dropping device. The reaction was allowed to proceed for 2 hours after the completion of the dropwise addition. The reaction product was then removed from the autoclave, neutralized with hydrochloric acid to pH 6-7, and dehydrated at -0.095 MPa (50 mmHg) and 100°C for 1 hour to remove any remaining water. Furthermore, the product was filtered to remove the neutralized salt produced by dehydration, and the compound of synthesis example b'2 was obtained.

[0044] <Method for preparing cosmetic products for evaluation> (1) If using arginine, prepare a 10% aqueous solution in advance. (2) While mixing component (d) (ion-exchanged water) with a disperser mixer, gradually add component (c) and dissolve it. (3) Next, add ingredient (a) or (a'), ingredient (b) or (b'), and other ingredients, and stir until homogenized.

[0045] <Evaluation Method> A user experience test was conducted with 20 men who identified as having oily skin. Each participant took 1.0g of the prepared cosmetic product and applied it to their entire face. The following four items were then evaluated by each panelist on a 4-point scale from 0 to 3 using the absolute evaluation system described below. (1) Refreshing feeling upon application (2) After applying the product, wear the mask for 6 hours, and check the moisturizing effect 5 minutes after removing the mask. (3) Shine of the skin after wearing the mask for 6 hours after application. (4) No stickiness after wearing the mask for 6 hours after application. Then, for each item, the total score is classified into five levels from AA to D, and AA A and B were deemed to have passed. Furthermore, for the evaluations after wearing masks in (2), (3), and (4), a pleated nonwoven fabric mask (material: polypropylene, pleated, manufactured by Tamagawa Eizai Co., Ltd.) was used and the evaluation was conducted after wearing it for 6 hours in a room at 25°C and 70% RH humidity.

[0046] <Final evaluation based on the sum of absolute scores> AA: Total score of 50-60 points A: Total score of 40-49 points B: Total score of 30-39 points C: Total score of 20-29 points D: Total score is less than 20 points

[0047] (1) Refreshing feeling upon application (Absolute evaluation criteria) (Rating): (Evaluation) 3: Provides an extremely refreshing feeling upon application. 2: Provides a refreshing feeling upon application. 1: I don't really feel much of a refreshing sensation when applying it. 0: No refreshing feeling is felt at all upon application. (2) After applying the product, wear the mask for 6 hours, and check the moisturizing effect 5 minutes after removing the mask. (Absolute evaluation criteria) (Rating): (Evaluation) 3: Excellent moisturizing properties. 2: Good moisturizing effect 1: Doesn't feel very moisturizing. 0: I don't feel any moisturizing effect at all. (3) Shine of the skin after wearing the mask for 6 hours after application. (Rating): (Evaluation) 3: No shine at all. 2: I hardly feel any shine. 1: I feel a slight shine. 0: Feels shiny (4) No stickiness after wearing the mask for 6 hours after application. (Rating): (Evaluation) 3: No stickiness at all. 2: I hardly feel any stickiness. 1: I feel a slight stickiness. 0: Feels sticky

[0048] <Examples 1-6 and Comparative Examples 1-11> Cosmetic formulations were prepared and evaluated using the method described above. Tables 3, 4, and 5 show the formulations and results. All formulations were prepared on a 100g scale.

[0049] [Table 1]

[0050] [Table 2]

[0051] [Table 3]

[0052] [Table 4]

[0053] [Table 5]

[0054] As shown in Table 3, in Examples 1 to 6, the product provided a refreshing feel upon application, excellent moisturizing properties after removing the mask after prolonged wear, and effectively suppressed greasiness and stickiness for oily skin individuals after wearing a mask for an extended period.

[0055] On the other hand, in Comparative Examples 1 to 11, sufficient effects were not obtained. In other words, Comparative Examples 1 to 4 contained comparative component (a') having a structure outside the range of component (a) of the present invention, and therefore could not simultaneously satisfy the effects of the present invention. In Comparative Examples 5 and 6, the comparative component (b') had a structure outside the range of component (b) of the present invention, and therefore, the effects of the present invention could not be simultaneously satisfied. In Comparative Example 7, because it did not contain ingredient (b), it was inferior in terms of the refreshing feeling upon application, the moist feeling after removing the mask, and the lack of stickiness after wearing the mask. In Comparative Example 8, the b / a ratio was greater than 1 / 5, resulting in inferiority in the refreshing feeling upon application, the moist feeling after removing the mask, and the lack of stickiness after wearing the mask. In Comparative Example 9, the content of component (a) and component (b) exceeded 25% by mass and 3% by mass, respectively, resulting in insufficient effects in all aspects. In Comparative Example 10, since component (a) was not included, the refreshing feeling upon application, the moist feeling after removing the mask, and the sticky feeling after wearing the mask were inferior. In Comparative Example 11, because it did not contain ingredient (c), it was inferior in terms of the refreshing feeling upon application, the moist feeling after removing the mask, and the lack of greasiness after wearing the mask.

Claims

1. A skin cosmetic comprising 0.1 to 25% by mass of component (a), 0.01 to 3% by mass of component (b), 0.1 to 25% by mass of component (c), and component (d), wherein the mass ratio of component (b) to component (a) ((b) / (a)) is 1 / 100 to 1 / 5. (a) Polyalkylene oxide derivatives represented by the following formula (1) Z-[O(AO) ｌ (EO) ｍ (BO) ｎ -+] ｐ ・・・(1) (In formula (1), Z is a residue obtained by removing all hydroxyl groups from an alcohol or sucrose having 3 to 9 carbon atoms. p is the valency of the alcohol or sucrose, and is between 3 and 9. AO is an oxyalkylene group having 3 to 4 carbon atoms, EO is an oxyethylene group, and BO is an oxybutylene group. The oxyalkylene group AO, the oxyethylene group EO, and the oxybutylene group BO may be attached in a block-like or random manner. However, if at least the oxyalkylene group AO and the oxybutylene group BO are attached in a random manner, AO is an oxypropylene group. In the derivative, the average number of moles of the oxyalkylene group AO added, p × l, satisfies 1 ≤ p × l ≤ 50; the average number of moles of the oxyethylene group EO added, p × m, satisfies 1 ≤ p × m ≤ 50; the average number of moles of the oxybutylene group BO added, p × n, satisfies 1 ≤ p × n ≤ 10; and the ratio of the average number of moles of the oxyethylene group EO added to the sum of the average number of moles of the oxyalkylene group AO and the average number of moles of the oxyethylene group EO added, m / (l + m), is between 0.15 and 0.

75. (b) Alkylene oxide derivatives represented by the following formula (2) R-[O(PO)x(EO)y-H]q... (2) (In formula (2), R is a residue obtained by removing all hydroxyl groups from an alcohol with 2 to 3 carbon atoms. q is the valency of the alcohol, and is between 2 and 3. PO is an oxypropylene group, EO is an oxyethylene group, The average number of moles of oxypropylene groups PO added in the derivative, x × q, satisfies 1 ≤ x × q ≤ 30. The average number of moles of oxyethylene groups EO added in the derivative, y × q, satisfies 1 ≤ y × q ≤ 40. The ratio y / (x+y) of the average number of moles of oxyethylene groups EO to the sum of the average number of moles of oxypropylene groups PO and the average number of moles of oxyethylene groups EO is 0.45 to 0.

75. The oxypropylene group PO and the oxyethylene group EO are randomly attached. (c) Polyhydric alcohols having 2 to 6 carbon atoms (d) Water

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