Cosmetics

Abstract

To provide a cosmetic that achieves simultaneous improvements to many properties during its use.SOLUTION: A cosmetic contains (a) an acrylamide thickener, (b) tamarind gum, and (c) water. The content of the acrylamide thickener is 0.01-1 mass% relative to the total amount of the cosmetic. The cosmetic is suitable for face serum.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to a cosmetic preparation suitable for use as a beauty serum or the like. [Background technology]

[0002] Conventionally, various cosmetic preparations have been studied for improving the texture of the skin by application to the skin. Such cosmetic preparations are required to have a dense feel and moistness when used, and also to have good adhesion when applied. In order to satisfy such various characteristics, the incorporation of various components, such as polymeric materials and surfactants, has been studied, but further improvement of characteristics is required. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2014-037404 A Summary of the Invention [Problem to be solved by the invention]

[0004] In general, when a cosmetic is improved in a desired characteristic according to a purpose, it becomes difficult to balance the other characteristics, and it is difficult to simultaneously satisfy all the characteristics. In the present invention, a cosmetic is desired that simultaneously improves many characteristics such as non-stickiness, freshness, smoothness, and adhesion while maintaining such a balance. [Means for solving the problem]

[0005] According to the present invention, the following inventions are provided. [1] (a) an acrylamide-based thickener, (b) tamarind gum, (c) water A cosmetic comprising the above-mentioned formula (1), wherein the blending amount of the acrylamide-based thickener is 0.01 to 1 mass % relative to the total amount of the cosmetic. [2] The cosmetic preparation according to [1], wherein a mass ratio of the total amount of the acrylamide-based thickener (a) to the total amount of the tamarind gum (b) is 0.2 to 3. [3] The acrylamide-based thickener (a) (Dimethylacrylamide / Sodium Acryloyldimethyltaurate) Crosspolymer, Acrylamide / 2-acrylamido-2-methylpropanesulfonic acid copolymer, A mixture of polyacrylamide and sodium polyacrylate, Sodium acrylate / 2-acrylamido-2-methylpropanesulfonic acid copolymer, Polyacrylamide / ammonium acrylate copolymer, and Acrylamide / sodium acrylate copolymer, The cosmetic preparation according to [1] or [2], which is one or more types selected from the group consisting of: [4] The cosmetic preparation according to any one of [1] to [3], further comprising (d) a carboxyvinyl polymer. [5] The cosmetic according to [4], wherein the blending amount of the carboxyvinyl polymer (d) is 0.01 to 0.5% by mass relative to the total amount of the cosmetic. [6] The cosmetic preparation according to any one of [1] to [5], further comprising (e) an alkyl-modified carboxyvinyl polymer. [7] The cosmetic according to [6], wherein the amount of the alkyl-modified carboxyvinyl polymer (e) is 0.0005 to 0.5% by mass relative to the total amount of the cosmetic. [8] (f) A cosmetic preparation according to any one of [1] to [7], further comprising a medicinal ingredient. [9] (g) The cosmetic preparation according to any one of [1] to [8], further comprising an alkylene oxide derivative.

[10] The cosmetic preparation according to any one of [1] to [9], which is a beauty serum. Effect of the Invention

[0006] According to the present invention, a cosmetic preparation is provided which has been improved simultaneously in many properties during use, specifically in non-stickiness, freshness, smoothness, and adhesion. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0007] Hereinafter, an embodiment of the present invention will be described in detail.

[0008] The cosmetic according to the present invention contains, as essential ingredients, (a) an acrylamide-based thickener, (b) tamarind gum, and (c) water.

[0009] [(a) Acrylamide-based thickener] The cosmetic composition according to the present invention contains an acrylamide thickener. The acrylamide thickener is a water-soluble polymer containing acrylamide as a comonomer. The acrylamide comonomer constituting such a polymer is, for example, a dialkylacrylamide represented by the following general formula: [ka] (In the formula, R 1 , is a hydrogen or a methyl group; R 2 and R 3 each independently represents a methyl group, an ethyl group, a propyl group, or an isopropyl group ) The acrylamide thickener is preferably a copolymer consisting of a nonionic comonomer and an ionic comonomer. The nonionic comonomer is preferably a dialkylacrylamide represented by the above general formula (1). Particularly preferred dialkylacrylamides are dimethylacrylamide and diethylacrylamide. The ionic comonomer to be combined therewith is, for example, a dialkylacrylamide represented by the R 2 or R 3Ionic comonomers having a sulfo group or an ammonium group bonded to the alkyl group of the above can be used. Particularly preferred ionic comonomers are sodium acryloyldimethyltaurate, 2-acrylamido-2-methylpropanesulfonic acid, and salts thereof. The monomer composition ratio (feed ratio of the polymerization system) of the nonionic comonomer and the ionic comonomer in the polymerization system is appropriately and arbitrarily determined according to the structure of the target acrylamide-based thickener. The feed ratio (molar ratio) of the polymerization system of the nonionic comonomer and the ionic comonomer is usually nonionic monomer:ionic monomer=0.5:9.5 to 9.5:0.5, preferably 1:9 to 9:1, and more preferably 7:3 to 9:1, and is used for copolymerization. Such an acrylamide-based thickener is selected depending on the purpose, (Dimethylacrylamide / Sodium Acryloyldimethyltaurate) Crosspolymer, Acrylamide / 2-acrylamido-2-methylpropanesulfonic acid copolymer, A mixture of polyacrylamide and sodium polyacrylate, Sodium acrylate / 2-acrylamido-2-methylpropanesulfonic acid copolymer, Polyacrylamide / ammonium acrylate copolymer, and Acrylamide / sodium acrylate copolymer, Among these, (dimethylacrylamide / sodium acryloyldimethyltaurate) crosspolymer or acrylamide / 2-acrylamide-2-methylpropanesulfonic acid copolymer is more preferred, and (dimethylacrylamide / sodium acryloyldimethyltaurate) crosspolymer is particularly preferred.

[0010] [(b) Tamarind gum] The cosmetic according to the present invention contains tamarind gum. Tamarind gum is a natural polymeric compound with high viscosity and high transparency, and is typically a polysaccharide having a structure called xyloglucan, in which the main chain is glucose and the side chains are xylose and galactose. Such tamarind gum is generally produced by purifying components extracted from tamarind seeds using warm water or an alkaline aqueous solution.

[0011] Various types of tamarind gum are commercially available, and any one can be used depending on the purpose.Specific examples include Glyloid 6C (manufactured by DSP Gokyo Food & Chemical Co., Ltd.).

[0012] [(c)Water] The cosmetic preparation according to the present invention further contains water in addition to the above-mentioned components. As the water, water used in cosmetics, quasi-drugs, etc., can be used, such as purified water, ion-exchanged water, tap water, etc.

[0013] [Amount and ratio of each ingredient] The cosmetic preparation according to the present invention contains the above-mentioned essential components (a) to (c). If necessary, other components described below may also be contained, but the cosmetic preparation according to the present invention contains an acrylamide thickener in an amount of 0.01 to 1 mass %, preferably 0.05 to 0.5 mass %, and more preferably 0.1 to 0.3 mass %, based on the total mass of the cosmetic preparation.

[0014] Furthermore, the cosmetic composition according to the present invention can provide a particularly excellent feeling when the blending ratio of the tamarind gum and the acrylamide thickener is within a specific range. Specifically, the mass ratio (a) / (b) of the total amount of the acrylamide thickener (a) to the total amount of the tamarind gum (b) is preferably 0.2-3, more preferably 0.4-2.

[0015] The cosmetic according to the present invention may be combined with other ingredients as necessary, but generally, it is preferable that the blending ratio of water is high. Specifically, the blending amount of water is preferably 60% by mass or more, and more preferably 70 to 90% by mass, based on the total amount of the cosmetic.

[0016] [Other additives] The cosmetic preparation according to the present invention may contain various additives as necessary in addition to the above-mentioned components (a) to (c). The components that can be combined are described below.

[0017] The cosmetic according to the present invention may further include (d) a carboxyvinyl polymer. Such a carboxyvinyl polymer is used as a general-purpose thickener for cosmetics, and is a polymer containing acrylic acid as a monomer unit. The carboxyvinyl polymer referred to here is one in which the carboxyl group is not modified, that is, one that is not included in the acrylamide-based thickener (a) or the alkyl-modified carboxyvinyl polymer (e) described below. Such carboxyvinyl polymers are generally commercially available, and are commercially available under the names Hiviswako (trade name, manufactured by Wako Pure Chemical Industries, Ltd.), Synthalen (trade name, manufactured by 3V SIGMA), Carbopol (trade name, manufactured by Goodrich Co., Ltd.), etc. These thickeners are crosslinked polymers having a chemically crosslinked structure. Aqueous dispersions of such crosslinked polymers have a very high thickening effect.

[0018] However, in the cosmetic according to the present invention, the thickening effect is sufficiently obtained by (a) the acrylamide thickener and (b) the tamarind gum, and therefore the blending amount of (d) the carboxyvinyl polymer, if blended, is preferably 0.01 to 0.5% by mass, more preferably 0.03 to 0.3% by mass, based on the total amount of the cosmetic.

[0019] The cosmetic according to the present invention may further comprise (e) an alkyl-modified carboxyvinyl polymer. This polymer is an acrylic polymer having a hydrocarbon group. More specifically, it is a polymer or copolymer containing an alkyl acrylate or an alkyl methacrylate as a polymerization unit. This polymer may contain acrylic acid or methacrylic acid without an alkyl group as a polymerization unit. Furthermore, it may be a crosspolymer in which these polymers are crosslinked with each other, or may be a crosslinked polyacrylic acid and an alkyl polyacrylate. Here, the alkyl group may be any of linear, branched, or alicyclic. The number of carbon atoms in the alkyl group is not particularly limited, but is preferably 2 to 50, more preferably 10 to 30.

[0020] This (e) alkyl-modified carboxyvinyl polymer contributes as an emulsion stabilizer or thickener for the cosmetic, and when incorporated, its amount is preferably 0.0005 to 0.5 mass % and more preferably 0.001 to 0.1 mass % relative to the total amount of the cosmetic.

[0021] The cosmetic according to the present invention may further comprise (f) a medicinal component. The medicinal component may be selected from conventionally known ones depending on the purpose, and examples of the medicinal component include whitening agents, anti-inflammatory agents, moisturizing agents, etc. It is preferable that these medicinal components are water-soluble.

[0022] Specific examples of such pharmaceutical ingredients include tranexamic acid and its derivatives and salts thereof, glycyrrhizic acid and its derivatives and salts thereof, L-ascorbic acid and its derivatives and salts thereof, alkoxysalicylic acid and its derivatives and salts thereof, glutathione and its derivatives and salts thereof, methoxysalicylic acid and its derivatives and salts thereof, nicotinamide, etc. Among these, tranexamic acid and its derivatives and salts thereof are preferred, with tranexamic acid being particularly preferred.

[0023] The cosmetic composition according to the present invention may further comprise (g) an alkylene oxide derivative, which is capable of improving the moisturizing feeling of the skin.

[0024] The (f) alkylene oxide derivative that can be used in the cosmetic according to the present invention is not particularly limited, but is preferably a compound represented by the following formula (a). R a O-[(AO) p (EO) q ]-R b (a) (In the formula, AO is an oxyalkylene group having 3 to 4 carbon atoms, EO is an oxyethylene group, p and q are the average added mole numbers of the oxyalkylene group having 3 to 4 carbon atoms and the oxyethylene group, respectively, and are 1≦p≦70 and 1≦q≦70, the ratio of the oxyethylene groups to the total of the oxyalkylene groups and the oxyethylene groups is 20 to 80 mass%, the oxyalkylene groups and the oxyethylene groups may be added in a block form or a random form, and R a and R b are the same or different hydrocarbon groups having 1 to 4 carbon atoms or hydrogen atoms, R a and R b The ratio of the number of hydrogen atoms to the number of hydrocarbon groups is 0.15 or less.

[0025] In the compound represented by the above formula (a), AO is an oxyalkylene group having 3 to 4 carbon atoms, such as an oxypropylene group, an oxybutylene group, an oxyisobutylene group, a trimethylene group, a tetramethylene group, and the like, and preferably an oxypropylene group or an oxybutylene group. p is the average number of moles of the oxyalkylene group having 3 to 4 carbon atoms added, and is 1≦p≦70, preferably 2≦p≦20. q is the average number of moles of the oxyethylene group added, and is 1≦q≦70, preferably 2≦q≦20. In addition, (p+q) is preferably 8 to 100.

[0026] In the compound represented by the formula (a), the ratio of oxyethylene groups to the total of oxyalkylene groups having 3 to 4 carbon atoms and oxyethylene groups is preferably 20 to 80% by mass. The order of addition of ethylene oxide and alkylene oxide having 3 to 4 carbon atoms is not particularly limited. The oxyethylene groups and oxyalkylene groups having 3 to 4 carbon atoms may be added in a block form or a random form, but are preferably added in a random form. Here, the block form includes not only a two-stage block but also a three-stage block.

[0027] R a and R b may be the same type, may be a mixture of a hydrocarbon group having 1 to 4 carbon atoms and a hydrogen atom, or may be a mixture of different hydrocarbon groups having 1 to 4 carbon atoms. a and R b In the hydrocarbon groups, the ratio of the number of hydrocarbon groups to the number of hydrogen atoms (Y), that is, Y / X, is 0.15 or less, and preferably 0.06 or less.

[0028] Specific examples of the alkylene oxide derivatives include polyoxyethylene (10 mol) polyoxypropylene (10 mol) dimethyl ether, polyoxyethylene (9 mol) polyoxypropylene (2 mol) dimethyl ether, polyoxyethylene (14 mol) polyoxypropylene (7 mol) dimethyl ether, polyoxyethylene (6 mol) polyoxypropylene (14 mol) dimethyl ether, polyoxyethylene (15 mol) polyoxypropylene (5 mol) dimethyl ether, polyoxyethylene (25 mol) polyoxypropylene (25 mol) dimethyl ether, polyoxyethylene (9 mol) polyoxybutylene (2 mol) dimethyl ether, polyoxyethylene (14 mol) polyoxybutylene (7 mol) dimethyl ether, polyoxyethylene (25 mol) polyoxypropylene (25 mol) dimethyl ether, polyoxyethylene (25 mol) polyoxypropylene (25 mol) dimethyl ether, polyoxyethylene (25 mol) polyoxypropylene (25 mol) dimethyl ether, polyoxyethylene (25 mol) polyoxybutylene (2 ...propylene (25 mol) dimethyl ether, Examples of the polyoxyethylene ether include ethylene (10 mol) polyoxypropylene (10 mol) diethyl ether, polyoxyethylene (10 mol) polyoxypropylene (10 mol) dipropyl ether, polyoxyethylene (10 mol) polyoxypropylene (10 mol) dibutyl ether, and polyoxyethylene (36 mol) polyoxypropylene (41 mol) dimethyl ether. Among these, polyoxyethylene (9 mol) polyoxypropylene (2 mol) dimethyl ether, polyoxyethylene (14 mol) polyoxypropylene (7 mol) dimethyl ether, and polyoxyethylene (36 mol) polyoxypropylene (41 mol) dimethyl ether are preferred, with polyoxyethylene (14 mol) polyoxypropylene (7 mol) dimethyl ether being particularly preferred.

[0029] The alkylene oxide derivatives used in the cosmetic composition of the present invention can be produced by known methods, for example, by addition polymerization of ethylene oxide and an alkylene oxide having 3 to 4 carbon atoms to a compound having a hydroxyl group, followed by an ether reaction with an alkyl halide in the presence of an alkali catalyst.

[0030] When an alkylene oxide derivative is blended into the cosmetic according to the present invention, the blending amount is not particularly limited, but is preferably 0.001 to 5 mass %, more preferably 0.01 to 3 mass %, and even more preferably 0.1 to 1 mass %, based on the total mass of the cosmetic.

[0031] The cosmetic according to the present invention may contain other additives that can be generally used in cosmetics, provided that the effects of the present invention are not impaired. Examples of such additives include moisturizers, pH adjusters, surfactants, silicone oils, preservatives, chelating agents, stabilizers, colorants, fragrances, and thickeners other than the above-mentioned components. These additives may be appropriately blended according to the formulation of the cosmetic.

[0032] The moisturizing agent can be any conventionally known moisturizing agent. Examples of such moisturizing agents include polyhydric alcohols and glycol ethers, more specifically, ethylene glycol, diethylene glycol, dipropylene glycol, 1,3-butylene glycol, glycerin, hexamethylene glycol, isoprene glycol, polyethylene glycol, hyaluronic acid, xylitol, sorbitol, maltitol, diglycerin (EO)PO adducts, etc.

[0033] Examples of pH adjusters include commonly used acids or alkalis, such as hydrochloric acid and sodium hydroxide.

[0034] As the surfactant, any surfactant known in the art can be selected and used, but silicone surfactant is preferred.Specific examples include polyether modified silicone, such as PEG-10 dimethicone, cetyl dimethyl copolyol, ralyl PEG-9 polydimethylsiloxyethyl dimethicone, PEG / PPG-19 / 19 dimethicone, PEG-9 polydimethylsiloxyethyl dimethicone, (dimethicone / (PEG-10 / 15)) crosspolymer, and polysilicone-13.

[0035] Examples of silicone oils include chain polysiloxanes (e.g., dimethylpolysiloxane, methylphenylpolysiloxane, diphenylpolysiloxane, etc.), cyclic polysiloxanes (e.g., decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane, etc.), silicone resins forming a three-dimensional network structure, silicone rubbers having an average molecular weight of 200,000 or more, and various modified polysiloxanes (amino-modified polysiloxanes, polyether-modified polysiloxanes, alkyl-modified polysiloxanes, fluorine-modified polysiloxanes, etc.).

[0036] Examples of preservatives include phenoxyethanol, chlorphenesin, benzoic acid, salicylic acid, sorbic acid, alkyl paraoxybenzoate esters, hexachlorophene, and ε-polylysine.

[0037] Chelating agents are used to sequester metal ions in cosmetics, and examples of such agents include sodium hexametaphosphate and sodium salt of ethylenediaminetetraacetic acid.

[0038] The stabilizer is selected depending on the components to be blended, and for example, sodium pyrosulfite can be used.

[0039] The type of the cosmetic of the present invention and the method of producing the cosmetic are not particularly limited. However, since the present invention significantly improves the properties of the cosmetic such as the feeling of adhesion when used, the preferred embodiment of the cosmetic of the present invention is a beauty serum. EXAMPLES

[0040] The present invention will be described in detail with reference to the following examples, but the present invention is not limited to these examples. The blend amounts are shown in mass % unless otherwise specified.

[0041] [Examples 1 to 9, Comparative Examples 1 to 7] Cosmetics of each of the Examples and Comparative Examples were prepared according to the formulations shown in Table 1.

[0042] Furthermore, the performance of these cosmetics was evaluated in terms of stickiness, freshness, smoothness, adhesion, and stability according to the following criteria.

[0043] [Sticky] (Evaluation method) Three expert panelists were selected from women in their 30s and 40s who had received sensory evaluation training and were able to evaluate using a set standard. The expert panelists applied each cosmetic product to their entire face, and after it had fully absorbed, they gently rubbed the skin from top to bottom and left to right to evaluate stickiness. Each cosmetic product was given a score on a 5-point scale using the absolute evaluation below, and the average score was calculated from the total scores of all panelists for each cosmetic product to make a judgment. (standard) A: No sticky feeling B: Almost no stickiness C: Slightly sticky feeling D: Sticky feeling E: Very sticky feeling

[0044] [Freshness] (Evaluation method) Three expert panelists were selected from women in their 30s and 40s who had received training in sensory evaluation and were able to evaluate using a set standard. The expert panelists applied each cosmetic product to the entire face, and immediately after application, gently stroked the skin from top to bottom and left to right to evaluate the freshness of the skin. Each cosmetic product was given a score on a 5-point scale using the absolute evaluation below, and the average score was calculated from the total scores of all panelists for each cosmetic product to make a judgment. A: I feel a great sense of freshness. B: Feels fresh C: Feels slightly fresh D: Almost no moisture E: Not feeling fresh

[0045] [Smoothness] (Evaluation method) Three expert panelists were selected from women in their 30s and 40s who had received training in sensory evaluation and were able to evaluate using a set standard. The expert panelists applied each cosmetic product to the entire face, and after it had fully absorbed, they gently stroked the skin from top to bottom and left to right to evaluate the smoothness. Each cosmetic product was given a score on a 5-point scale using the absolute evaluation below, and the average score was calculated from the total scores of all panelists for each cosmetic product to make a judgment. (standard) A: I feel it is very smooth. B: Feels moderately smooth C: Somewhat smooth D: Almost no smoothness E: No smoothness at all

[0046] [Close fit] (Evaluation method) Three expert panelists were selected from women in their 30s and 40s who had received training in sensory evaluation and were able to evaluate using a set standard. The expert panelists applied each cosmetic product to the entire face, tapped the skin immediately after application, and evaluated the adhesion. Each cosmetic product was given a score on a 5-point scale using the absolute evaluation below, and the average score was calculated from the total scores of all panelists for each cosmetic product to make a judgment. (standard) A: It feels so strong that it sticks to your skin. B: Feels close to the skin C: Moderate feeling of adhesion D: Slight feeling of adhesion E: No sense of adhesion

[0047] [Stability] (Evaluation method) The cosmetic compositions were stored under low and high temperature conditions, and the condition of the cosmetic compositions was visually inspected and evaluated. (standard) Good: No visible changes Not acceptable: gelation has occurred

[0048] [Table 1] In the table, the blending ratio of each component is expressed as mass %.

[0049] These results show that the cosmetics of the present invention are excellent in terms of stickiness, freshness, smoothness, adhesion, and stability. It is also clear that increasing the amount of acrylamide-based thickener tends to improve adhesion.

[0050] In addition, when the results of the comparative examples are also considered, it is understood that the cosmetic composition according to the present invention achieves excellent effects by using an acrylamide thickener and tamarind gum simultaneously, and the effects of the present invention cannot be obtained by combining a carboxyvinyl polymer, etc. It is also understood that the use of polyethylene glycol instead of an acrylamide thickener can improve the freshness, etc., but results in insufficient stability of the cosmetic composition.

[0051] Furthermore, the richness (thickness) of the cosmetics of Examples 1 to 3 and 6 to 9 was evaluated according to the following criteria. The results are shown in Table 2.

[0052] [Richness (richness)] (Evaluation method) Three expert panelists were selected from women in their 30s and 40s who had received training in sensory evaluation and were able to evaluate using a set standard. The expert panelists applied each cosmetic product to the entire face, and evaluated the richness of the product by gently stroking the skin up, down, left and right before the product was absorbed into the skin. Each cosmetic product was given a score on a 5-point scale using the absolute evaluation below, and the average score was calculated from the total scores of all panelists for each cosmetic product to make a judgment. (standard) A: Strong richness B: Feel the richness C: Moderately rich flavor D: Slightly rich taste E: No richness

[0053] [Table 2] In the table, only the main components of each example are shown, and the blending ratios of additives and water are omitted.

[0054] These results show that increasing the amount of acrylamide-based thickener tends to improve the richness.

Claims

1. (a) an acrylamide-based thickener, (b) tamarind gum, (c) water; (d) a carboxyvinyl polymer, and (e) Alkyl-modified carboxyvinyl polymer A cosmetic comprising: The acrylamide-based thickener (a) is a (dimethylacrylamide / sodium acryloyldimethyltaurate) crosspolymer, the blending amount of the acrylamide-based thickener is 0.01 to 1% by mass relative to the total amount of the cosmetic; a mass ratio of the total amount of the acrylamide-based thickener (a) to the total amount of the tamarind gum (b) is 0.2 to 3.

2. The cosmetic according to claim 1, wherein the blending amount of the carboxyvinyl polymer (d) is 0.01 to 0.5% by mass based on the total amount of the cosmetic.

3. The cosmetic according to claim 1 or 2, wherein the amount of the alkyl-modified carboxyvinyl polymer (e) is 0.0005 to 0.5% by mass based on the total amount of the cosmetic.

4. The cosmetic preparation according to any one of claims 1 to 3, further comprising (f) a medicinal ingredient.

5. (g) a compound represented by the following formula (a): 2 ａ O[(AO) ｐ (59) ｑ )-2 ｂ (a) (In the formula, AO is an oxyalkylene group having 3 to 4 carbon atoms, EO is an oxyethylene group, p and q are the average number of moles of the oxyalkylene group having 3 to 4 carbon atoms and the average number of moles of the oxyethylene group added, respectively, and are 1≦p≦70 and 1≦q≦70. The ratio of the oxyethylene groups to the total of the oxyalkylene groups and the oxyethylene groups is 20 to 80 mass %, and the oxyalkylene groups and the oxyethylene groups may be added in a block form or a random form. R ａ and R ｂ are the same or different hydrocarbon groups having 1 to 4 carbon atoms or hydrogen atoms, R ａ and R ｂ The ratio of the number of hydrogen atoms to the number of hydrocarbon groups is 0.15 or less. The cosmetic preparation according to any one of claims 1 to 4, further comprising an alkylene oxide derivative represented by the formula:

6. The cosmetic preparation according to any one of claims 1 to 5, which is a beauty serum.

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