Water-based cleansing agent

Abstract

To provide an aqueous cleansing agent having excellent compatibility to a makeup, rinsability and removal effect on horny plug.SOLUTION: There is provided an aqueous cleansing agent which comprises 1 to 25 mass% of a component (A) and 1 to 25 mass% of a component (B), wherein the content ratio ((A) / (B)) is 0.1 to 10. The component (A): R-O-(PO)a-[(PO)b / (EO)c]-H (I) (R is a linear or branched chain alkyl group having 1 to 30 carbon atoms and 1≤a≤40, 1≤b≤40, 1≤c≤80 and (a+b+c)≥20. [(PO)b / (EO)c] represents a polyoxyalkylene group obtained by bonding b moles of PO and c moles of EO in a random form and the random rate x is 0.1≤x<1). The component (B): HO-(EO)l-(PO)m-(EO)n-H (II) (1≤l+n≤150, 1≤m≤100, the mass ratio (EO / PO) is 1 / 10 to 5 / 1 and EO and PO are bonded in a block form.)SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to an aqueous cleansing agent used to remove makeup cosmetics (hereinafter sometimes simply referred to as "makeup") and the like. [Background technology]

[0002] Cleansing agents are used to remove skin dirt derived from makeup cosmetics containing oils and pigments, as well as dirt derived from sebum and the like. Cleansing agents include aqueous cleansing agents that are oil-free and made of an aqueous medium, oil-based cleansing agents containing oil, oil-in-water cleansing agents, and water-in-oil cleansing agents. Among these, aqueous cleansing agents are superior to oil-based cleansing agents in terms of rinsing ability, being easy to wipe off or wash off and leaving little stickiness, but are inferior in terms of cleansing power. In particular, because they are aqueous, they require time for makeup cosmetics, sebum, and other oily dirt to blend in, making them unable to quickly cleanse. Furthermore, adding a large amount of surfactant to achieve sufficient cleansing power poses problems such as poor rinsing ability, leaving stickiness, and dry skin due to excessive degreasing.

[0003] As methods for increasing cleansing power while suppressing stickiness and dryness of the skin, methods such as those described in Patent Documents 1 and 2 have been proposed, and improvements in the feel of aqueous cleansing agents have been made in this way. However, while such aqueous cleansing agents can effectively cleanse oily dirt such as sebum, it is still difficult to remove pore dirt such as keratin plugs and blackheads. Pore dirt such as keratin plugs and blackheads is cited as a skin concern for many consumers, and there is a demand for aqueous cleansing agents that can remove these pore dirt as well as oily dirt such as sebum. Here, keratin plugs are formed when keratin and sebum are solidified in pores, and if left untreated, they can cause skin problems such as acne, as well as enlarged pores and blackheads, which can damage the health and beauty of the skin. Although various technologies effective in removing keratin plugs have been developed in the past, they generally required the use of a dedicated keratin plug remover in addition to the cleanser. Therefore, if a cleanser could be used to remove makeup and keratin plugs at the same time, it would be desirable from the perspective of simplifying the cleansing process. In light of this, it is desirable to provide an aqueous cleansing agent that is easy to blend with makeup, easy to rinse off, and has excellent keratin plug removal effects. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-193618 [Patent Document 2] Japanese Patent Application Laid-Open No. 2016-132627 Summary of the Invention [Problem to be solved by the invention]

[0005] An object of the present invention is to provide an aqueous cleansing agent that is easily compatible with makeup, has excellent rinsing properties, and is effective in removing keratin plugs. [Means for solving the problem]

[0006] The present inventors have conducted extensive research to solve the above-mentioned problems and have found that a composition containing the following components (A) and (B) in specific amounts solves the above-mentioned problems, thereby completing the present invention.

[0007] That is, the present invention is an aqueous cleansing agent containing 1 to 25 mass% of the following component (A) and 1 to 25 mass% of component (B), with the content ratio of component (A) to component (B) ((A) / (B)) being 0.1 to 10.

[0008] Component (A): An alkylene oxide derivative represented by formula (I) RO-(PO) a -[(PO) b / (EO) c ]-H (I) (R represents a linear or branched alkyl group having 1 to 30 carbon atoms. PO represents an oxypropylene group, and EO represents an oxyethylene group. a and b represent the average number of moles of oxypropylene groups added per molecule, and c represents the average number of moles of oxyethylene groups added per molecule, and these values ​​are 1≦a≦40, 1≦b≦40, 1≦c≦80, and (a+b+c)≧20. [(PO)b / (EO)c] represents a polyoxyalkylene group in which b moles of PO and c moles of EO are randomly bonded, and the random ratio x is 0.1≦x<1.)

[0009] Component (B): an alkylene oxide derivative represented by formula (II) HO―(EO) l -(PO) m -(EO) n -H (II) (EO is an oxyethylene group, and PO is an oxypropylene group. l and n are the average number of moles of oxyethylene groups added per molecule, and m is the average number of moles of oxypropylene groups added per molecule, with 1≦l+n≦150 and 1≦m≦100. The mass ratio of EO to PO (EO / PO) is 1 / 10 to 5 / 1. EO and PO are bonded in blocks.) [Effects of the Invention]

[0010] The aqueous cleansing agent of the present invention is easily compatible with oily dirt such as makeup cosmetics, so it has good cleansing power, and also has excellent rinsing properties, so it is easy to rinse off and does not leave stickiness on the skin, so it not only has the favorable effect as a cleansing agent, but also has the effect as a keratin plug remover.Therefore, the aqueous cleansing agent of the present invention can be used to remove makeup and remove keratin plugs, so compared with the case where a dedicated keratin plug remover is used for removing keratin plugs, the cleaning process is simple and the cleaning time is shortened. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, an embodiment of the present invention will be described. The aqueous cleansing agent of the present invention contains at least component (A) and component (B). Each component will be explained below in turn. In this specification, numerical ranges defined using the symbol "to" are inclusive of the numerical values ​​at both ends (upper and lower limits) of the symbol "to." For example, "2 to 10" represents a range from 2 to 10. In this specification, "room temperature" refers to 25°C. In this specification, when a composition contains multiple substances corresponding to each component, the content of each component in the composition means the total content of the multiple substances present in the composition, unless otherwise specified.

[0012] [Alkylene oxide derivative (component (A))] Component (A) is an alkylene oxide derivative represented by formula (I). RO-(PO) a -[(PO) b / (EO) c ]-H (I)

[0013] R in formula (I) represents a linear or branched alkyl group having 1 to 30 carbon atoms. The alkylene oxide derivative of formula (I) is usually produced using an alcohol, and R in formula (I) is derived from the alcohol used in producing the alkylene oxide derivative of formula (I). Such an alcohol is a linear or branched alcohol having 1 to 30 carbon atoms, and may be saturated or unsaturated, but is preferably a saturated alcohol. The saturated alcohol preferably has 1 to 20 carbon atoms, more preferably 1 to 12 carbon atoms, even more preferably 1 to 8 carbon atoms, and particularly preferably 1 to 5 carbon atoms. Specific examples of saturated alcohols include methanol, ethanol, propanol, butanol, hexanol, heptanol, octanol, isooctadecanol, 2-octyldecanol, and 2-decyltetradecanol. If the number of carbon atoms in R in formula (I) is too small, the compound may not blend well with makeup, whereas if the number of carbon atoms in R is too large, the compound may feel sticky when applied. One or more of these alcohols can be used in the production of the alkylene oxide derivative of formula (I).

[0014] In formula (I), PO is an oxypropylene group, and EO is an oxyethylene group. In formula (I), a and b are the average number of moles of PO added per molecule, and c is the average number of moles of EO added per molecule. a is a number from 1 to 40, preferably from 5 to 30, more preferably from 5 to 20, and even more preferably from 5 to 15. If a is too small, the makeup may not blend well with the cosmetic, and if a is too large, a sticky feeling may occur upon application. b is a number from 1 to 40, preferably from 5 to 30, more preferably from 10 to 25, and even more preferably from 15 to 25. If b is too small, component (A) may become solid at room temperature, resulting in poor handleability and a sticky feeling. If b is too large, solubility in water may decrease, reducing the ease with which makeup blends in. c is a number from 1 to 80, preferably from 10 to 60, more preferably from 20 to 50, and even more preferably from 20 to 40. If c is too small, the blendability with makeup may decrease. If c is too large, the crystallinity increases and the product becomes solid at room temperature, which may decrease the blendability with makeup or cause a sticky feeling. The sum of a, b, and c (a+b+c) is 20 or more, preferably 30 or more, more preferably 40 or more, and even more preferably 50 or more. If (a+b+c) is too small, the makeup may not blend well. From the viewpoint of ease of handling, (a+b+c) is preferably 100 or less, more preferably 80 or less, and even more preferably 70 or less.

[0015] The bonding moiety between PO and EO in formula (I) is [(PO) b / (EO) cThis indicates that in the present invention, b moles of PO and c moles of EO are bonded randomly, not in a block form. If EO and PO are bonded in a block form, component (A) becomes solid at room temperature, which may result in poor handleability and a sticky feeling.

[0016] The alkylene oxide derivative represented by formula (I) has a random ratio x of 0.1≦x<1, preferably 0.3≦x≦0.97, more preferably 0.5≦x≦0.9, and even more preferably 0.6≦x≦0.9. If the random ratio x is too small, component (A) will be solid at room temperature, which may result in poor handling and a reduced moist feeling on the skin after rinsing. If the random ratio x is too large, makeup compatibility may be reduced and a sticky feeling may occur. The random ratio x in the alkylene oxide derivative represented by formula (I) can be calculated from the average numbers a, b, and c of moles of PO and EO added per molecule in formula (I) using the following formula (III). x = (b + c) / (a + b + c) (III)

[0017] The alkylene oxide derivative represented by formula (I) can be produced by a known method. For example, the alkylene oxide derivative of formula (I) can be obtained by addition-polymerizing propylene oxide with a linear alcohol having 1 to 30 carbon atoms in the presence of an alkali catalyst at 50 to 160°C and 0.5 MPa (gauge pressure) or less, followed by addition-polymerizing a mixture of ethylene oxide and propylene oxide, neutralizing with an acid, and then removing water and neutralized salts.

[0018] The content of component (A) is 1 to 25% by mass, preferably 2 to 20% by mass, and more preferably 3 to 15% by mass, based on 100% by mass of the aqueous cleansing agent. If the content of component (A) is too low, it may be difficult to fully exert the effect of removing makeup and keratin plugs. If the content of component (A) is too high, rinsing performance may be reduced, and a sticky feeling may occur after use. The component (A) may be used alone or in combination of two or more.

[0019] [Alkylene oxide derivative (component (B))] Component (B) is an alkylene oxide derivative represented by formula (II). HO―(EO) l -(PO) m -(EO) n -H (II)

[0020] In formula (II), EO is an oxyethylene group, and l and n each represent the average number of moles added per molecule of EO. However, neither l nor n is 0. l+n is 1 to 150, preferably 5 to 75, more preferably 10 to 50, and even more preferably 15 to 35. If l+n is too small, the compatibility of component (B) with water may decrease, resulting in impaired rinsing properties. If l+n is too large, the compatibility of component (B) with oil may decrease, resulting in impaired compatibility with makeup.

[0021] In formula (II), PO is an oxypropylene group, and m is the average number of moles added per molecule of PO. m is 1 to 100, preferably 5 to 75, more preferably 10 to 50, and even more preferably 20 to 40. If m is too small, the compatibility of component (B) with oil may decrease, resulting in poor makeup blendability, while if m is too large, the compatibility of component (B) with water may decrease, resulting in poor rinsing properties.

[0022] In the general formula (II), EO and PO are bonded in a block form. The mass ratio of EO to PO (EO / PO) is 1 / 10 to 5 / 1, preferably 1 / 5 to 4 / 1, more preferably 1 / 3 to 3 / 1, and even more preferably 1 / 2 to 5 / 2. If the mass ratio (EO / PO) is too small, the compatibility of component (B) with water may decrease, impairing rinsing properties, whereas if the mass ratio (EO / PO) is too large, the compatibility of component (B) with oil may decrease, impairing compatibility with makeup.

[0023] The alkylene oxide derivative represented by formula (II) can be produced by a known method, for example, by addition polymerization of propylene oxide and ethylene oxide in that order to propylene glycol in the presence of an alkali or acid catalyst, neutralizing the mixture with an acid, and then removing water and neutralized salts to obtain the alkylene oxide derivative represented by formula (II).

[0024] The content of component (B) is 1 to 25% by mass, preferably 2 to 20% by mass, and more preferably 3 to 15% by mass, based on 100% by mass of the aqueous cleansing agent. If the content of component (B) is too low, it may be difficult to fully exert the effect of removing makeup and keratin plugs. If the content of component (B) is too high, a sticky feeling may occur after use. The component (B) may be used alone or in combination of two or more.

[0025] In the aqueous cleansing agent of the present invention, the content ratio of component (A) to component (B) ((A) / (B)) is 0.1 to 10, preferably 0.25 to 4, and more preferably 0.5 to 2. If the content ratio ((A) / (B)) is too small, it may be difficult to fully exert the effect of removing makeup and keratin plugs. If the content ratio ((A) / (B)) is too large, rinsing properties may be reduced, and a sticky feeling may occur after use.

[0026] [Polyhydric alcohol (component (C))] The aqueous cleansing agent of the present invention may contain a polyhydric alcohol from the viewpoint of suppressing dryness after use and providing a moist feeling. The polyhydric alcohol used in the present invention is not particularly limited as long as it is one that is commonly used in cosmetics, and examples thereof include glycols and glycerins. Specific examples of glycols include ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol, propylene glycol, dipropylene glycol, isoprene glycol, 1,3-butylene glycol, 1,2-pentanediol (pentylene glycol), 1,2-hexanediol, and 1,2-octanediol. Examples of glycerins include glycerin, diglycerin, and polyglycerin. Of these polyhydric alcohols, glycerin, dipropylene glycol and 1,2-pentanediol are preferred.

[0027] When component (C) is used, the content of component (C) is preferably 1 to 25% by mass, more preferably 2 to 20% by mass, and even more preferably 3 to 15% by mass, relative to 100% by mass of the aqueous cleansing agent. When component (C) is used, one type may be used alone, or two or more types may be used in combination.

[0028] 〔water〕 The aqueous cleansing agent of the present invention contains at least water in addition to the above components (A) to (C), and the water is preferably deionized water, ion-exchanged water, or distilled water. The content of water is appropriately set so that the total content of the above components (A) and (B), and the total content when component (C) is further contained as needed, is preferably 75% by mass or more, more preferably 80 to 100% by mass, and even more preferably 85 to 99% by mass, relative to 100% by mass of the aqueous cleansing agent.

[0029] [Other ingredients] The aqueous cleansing cosmetic of the present invention may contain, in addition to the above-mentioned components, additives used in cosmetics, quasi-drugs, pharmaceuticals, etc., as needed, within the scope of not impairing the effects of the present invention. For example, natural fragrances or synthetic fragrances may be contained for the purpose of increasing palatability. Natural fragrances are essential oils obtained by steam distillation or other methods from the flowers, stems, leaves, fruits, peels, and roots of plants, and the separated water can also be used as aromatic perfumes. Synthetic fragrances include esters, ethers, aldehydes, ketones, aromatic alcohols, hydrocarbons, and other substances. Other additives include lower alcohols such as ethanol and isopropanol; sugars such as lactose and sucrose; anionic surfactants such as acylmethyltaurine salts, alkyl ether sulfate salts, and amide ether sulfate salts; water-soluble polymers such as carboxyvinyl polymers, carboxymethylcellulose, hydroxyethylcellulose, and hydroxypropylmethylcellulose; cationic polymers such as ceramide, cholesterol, and cationized cellulose; thickening polysaccharides such as xanthan gum; organic or inorganic salts such as citrate, malate, and salt; acids and alkalis as pH adjusters; parabens; preservatives; extracts derived from plants and animals; vitamins; amino acids; colorants; and pigments. The content of the above additives, excluding the above components (A) to (C) and water, is appropriately set to be preferably 25% by mass or less, more preferably 20% by mass or less, and even more preferably 15% by mass or less, relative to 100% by mass of the aqueous cleansing agent.

[0030] The aqueous cleansing cosmetic of the present invention can be produced by a conventional method, for example, by mixing at least the above-mentioned components (A) and (B), and optionally further component (C) and additives, with water to dissolve or disperse them, and then adjusting with water so that the total of all components, including water, is 100% by mass. [Example]

[0031] The present invention will be described in more detail below with reference to examples and comparative examples. [Examples 1 to 5 and Comparative Examples 1 to 5] Compounds 1 to 5 shown in Table 1 were used as components (A) and (A'), and compounds 6 and 7 shown in Table 2 were used as components (B) and (B'), and aqueous cleansing cosmetics were prepared by blending them in the compositions shown in Table 3, and evaluated by the methods described below. The letters in Tables 1 and 2 represent the letters in formula (I) and formula (II), respectively. R in Table 1 represents the alcohol used in producing compounds 1 to 5. The content of each component in Table 3 is shown in mass %. The common components listed in Table 3 consist of the seven components shown in Table 4. Glycerin and dipropylene glycol in Table 4 correspond to component (C).

[0032] (a) Ease of wearing makeup Twenty women (aged 25-40) served as panelists. Foundation (product name: Moisture Powder Foundation, Chifure Cosmetics Co., Ltd.) was evenly applied to the inner forearm in a 2 cm diameter circle, then allowed to dry for 15 minutes. 100 mg of an aqueous cleanser sample was applied to the foundation application area and blended with a finger for 30 seconds. The ease of blending of the foundation was evaluated as follows: Furthermore, a total score of 35 points or more by the 20 panelists was evaluated as "◎", 30-34 points as "○", 20-29 points as "△", and less than 20 points as "×". 2 points: I felt it was a good fit. 1 point: I felt that it fit in fairly well. 0 points: I felt that it didn't fit well.

[0033] (b) Rinseability Twenty women (aged 25-40) served as panelists. After performing the evaluation in (a) above, they rinsed the applied area with running water. The ease of rinsing and the condition of the skin after rinsing were evaluated as follows: A total score of 35 points or more by the 20 panelists was evaluated as "◎", 30-34 points as "○", 20-29 points as "△", and less than 20 points as "×". 2 points: It was easy to rinse off and didn't feel sticky on the skin. 1 point: It was a little difficult to rinse off or felt a little sticky on the skin. 0 points: Difficult to rinse off and felt sticky on the skin.

[0034] (c) Blackhead removal effect The keratin plug removal effect was evaluated by a washing test of artificial keratin plugs carried out according to the following procedure. (1) The components shown in Table 5, except for charcoal, were mixed at 80°C, cooled, and colored with charcoal to prepare a sample of a model keratin plug. (2) 0.02 g of the above model keratin plug was placed on artificial leather and spread with fingers. (3) Then, 0.1 g of a sample of water-based cleanser was applied and rubbed with a finger 20 times. (4) After rinsing with running water, the degree of residual model keratin plugs on the artificial leather was visually observed. The evaluation criteria for the effectiveness of keratin plug removal were divided into 10 stages, with 1 representing "almost no model keratin plugs removed" and 10 representing "almost no model keratin plugs remaining." 9 and 10 were evaluated as "◎," 6 to 8 as "○," 3 to 5 as "△," and 1 and 2 as "×."

[0035] [Table 1]

[0036] [Table 2]

[0037] [Table 3]

[0038] [Table 4]

[0039] [Table 5]

[0040] As is clear from the results shown in Table 3, the aqueous cleansing agents of Examples 1 to 5 were superior to the aqueous cleansing agents of Comparative Examples 1 to 5 in terms of ease of blending with makeup, ease of rinsing, and effectiveness in removing blackheads. Specifically, Comparative Examples 1 and 2, which did not contain component (A) or component (B), were inferior in the blackhead removal effect, Comparative Example 3, which contained compound 4 as component (A') instead of component (A), was inferior in both compatibility with makeup and blackhead removal effect, and Comparative Example 4, which contained compound 5 as component (A') instead of component (A), and Comparative Example 5, which contained compound 7 as component (B') instead of component (B), were inferior in both rinsability and blackhead removal effect.

[0041] Furthermore, formulation examples of the aqueous cleansing agent of the present invention are shown in the following Table 6. Note that glycerin, dipropylene glycol, and pentylene glycol in Table 6 correspond to component (C).

[0042] [Table 6]

[0043] Like the above examples, this formulation example was also excellent in terms of compatibility with makeup, rinsability, and keratin plug removal effect. [Industrial Applicability]

[0044] The aqueous cleansing agent of the present invention can remove not only makeup cosmetics and dirt from the skin but also dirt from pores such as keratin plugs, and therefore can be suitably used as a time-saving makeup remover.

Claims

[Claim 1] An aqueous cleansing agent containing 1 to 25 mass% of the following component (A) and 1 to 25 mass% of component (B), wherein the content ratio of component (A) to component (B) ((A) / (B)) is 0.1 to 10. Component (A): An alkylene oxide derivative represented by formula (I) R-O-(PO) ａ -[(PO) ｂ / (EO) ｃ ]-H ・・・(I) (R represents a linear or branched alkyl group having 1 to 30 carbon atoms. PO represents an oxypropylene group, and EO represents an oxyethylene group. a and b represent the average number of moles of oxypropylene groups added per molecule, and c represents the average number of moles of oxyethylene groups added per molecule, and 1≦a≦40, 1≦b≦40, 1≦c≦80, and (a+b+c)≧20. [(PO)b / (EO)c] represents a polyoxyalkylene group formed by b moles of PO and c moles of EO bonded randomly, and the random ratio x is 0.1≦x<1.) Component (B): Alkylene oxide derivative represented by formula (II) HO―(EO) ｌ -(O) ｍ ―(49) ｎ -H・・・(II) (EO is an oxyethylene group, and PO is an oxypropylene group. 1 and n are the average number of moles of oxyethylene groups added per molecule, and m is the average number of moles of oxypropylene groups added per molecule, with 1≦l+n≦150 and 1≦m≦100. The mass ratio of EO to PO (EO / PO) is 1 / 10 to 5 / 1. EO and PO are bonded in the form of blocks.)

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