Skin cosmetic

Abstract

To provide a skin cosmetic which has excellent storage stability by suppressing the precipitation of contained components and excellent comfort feeling during application and small difference in sense of use before and after shaving while containing natural water and a glycerin monoalkyl ether or a glycerin mono-fatty acid ester having an antimicrobial effect.SOLUTION: There is provided a skin cosmetic which contains (A) 10 to 98 mass% of natural water having hardness of 10 to 200 mg / L, (B) 0.001 to 0.4 mass% of one or more selected from the group consisting of a glycerin monoalkyl ether having a solubility in water at 25°C of 0.01 mass% or more and having an antimicrobial effect, which is a monoether of an alcohol having 6 to 10 carbon atoms and glycerin and a glycerin mono-fatty acid ester having a solubility in water at 25°C of 0.01 mass% or more and having an antimicrobial effect, which is a monoester of a fatty acid having 6 to 10 carbon atoms and glycerin, (C) 0.5 to 25 mass% of a divalent alcohol having 3 to 6 carbon atoms and (D) 0.00001 to 0.05 mass% of acidic mucopolysaccharides.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to a skin cosmetic preparation suitable for moisturizing the skin of the face, body, etc. [Background technology]

[0002] The water generally used in skin cosmetics is ion-exchanged water, which is made by removing impurities such as metal ions using ion exchange resins, from tap water that has been collected from rivers and other sources and purified. Components removed by ion exchange resins may include mineral salts such as calcium ions and magnesium ions that, together with amino acids and organic acids, constitute natural moisturizing factors (NMFs). NMF plays an important role in maintaining healthy skin, and it is known that when the amount of NMF in the stratum corneum decreases, the skin's moisturizing function decreases and the skin becomes more susceptible to dryness. It is widely recognized that mineral salts, such as calcium ions and magnesium ions, which are components of NMF, are effective in moisturizing the skin.

[0003] However, when mineral salts (especially divalent or higher mineral salts) are blended into aqueous skin cosmetics, their chelating action can cause substances dissolved in water to bind together, resulting in the formation of water-insoluble substances. Therefore, when natural water rich in mineral salts is used in skin cosmetics, the mineral salts contained in the natural water may cause the formation of water-insoluble substances. The water-insoluble substances generated in skin cosmetics not only deteriorate the appearance due to precipitation, etc., but may also cause roughness when applied, reducing the comfort of application.

[0004] In order to ensure that skin cosmetics are comfortable to apply, it is necessary to reduce the roughness upon application described above as well as stinging, such as a squeaky feeling, itching, or a burning sensation. In addition, in order to obtain a comfortable feeling when applying a skin cosmetic, the condition of the skin when the skin cosmetic is applied is also important. If the skin is inflamed, such as rough skin, the skin is less comfortable when applied, and in particular, if the skin has acne, the comfort of application is likely to decrease. Therefore, in order to obtain a comfortable feeling when applied, it is important to prevent acne on the skin to which the skin cosmetic is applied.

[0005] Ingredients with antibacterial effects, such as salicylic acid, are widely used in cosmetics to prevent acne. On the other hand, when the amount of the ingredient with antibacterial effects is increased to the extent that the ingredient exerts its antibacterial effect, stinging may occur. Therefore, cosmetics that can exert their antibacterial effect even with a small amount of the ingredient with antibacterial effect are desired, and a cosmetic containing a combination of deep sea water and a bactericide has been disclosed in order to enhance the antibacterial effect of the antibacterial ingredient and reduce irritation to the skin (Patent Document 1).

[0006] Patent Document 2 describes that in an acne-improving composition containing artichoke extract and saxifrage extract, the acne-improving performance is improved by including at least one of isopropyl methylphenol and glycerin mono 2-ethylhexyl ether as a bactericide. Patent Document 3 describes the use of zinc coceth sulfate in combination with an antibacterial agent selected from myrtle extract, triglyceryl monocaprylate, glyceryl caprate, and cetrimonium bromide as an antibacterial agent against acne bacteria. Glycerol monoalkyl ethers such as glycerol mono 2-ethylhexyl ether described in Patent Document 2 and glycerol monofatty acid esters such as glyceryl caprate described in Patent Document 3 are known to have a certain antibacterial effect and are used as preservative aids to reduce the amount of antibacterial agents used. However, the glycerin monoalkyl ethers and glycerin monofatty acid esters, which have the above-mentioned antibacterial effect, have low solubility in water, and in cosmetics containing deep sea water or natural water, the mineral salts contained in the deep sea water or natural water may promote the precipitation of the glycerin monoalkyl ethers and glycerin monofatty acid esters, which may be further promoted when the cosmetics are stored at below freezing points, particularly in bathrooms during cold seasons. When these components precipitate, the appearance of the cosmetics may deteriorate, and the comfort of application may decrease.

[0007] The comfort of application is influenced not only by the presence or absence of skin diseases such as skin inflammation and acne, but also by temporary external stimuli. Shaving is an example of a temporary external stimuli of the skin. Cosmetics are used before shaving to soften dry skin, and after shaving to prevent dry skin, but the feeling of use on the skin before shaving may differ from the feeling of use on the skin after shaving. When shaving the face or body hair with a shaver, old keratin is also removed, so the skin becomes sensitive to external stimuli such as friction, hot and cold sensations, etc. Therefore, even if a cosmetic product is felt to be comfortable before shaving, the comfort of the cosmetic product may decrease after shaving, and a cosmetic product with a small difference in feeling of use before and after shaving has been desired.

[0008] However, a skin cosmetic preparation that contains natural water and a glycerin monoalkyl ether or a glycerin monofatty acid ester having antibacterial effects, while suppressing precipitation of the contained components, has excellent storage stability and comfort when applied, and shows little difference in the feel when used before and after shaving, has not yet been developed. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] Japanese Patent Application Publication No. 10-182346 [Patent Document 2] JP 2015-166319 A [Patent Document 3] Special Publication No. 2015-522053 Summary of the Invention [Problem to be solved by the invention]

[0010] Therefore, an object of the present invention is to provide a skin cosmetic preparation which contains natural water and a glycerin monoalkyl ether or a glycerin monofatty acid ester having antibacterial effects, while suppressing precipitation of the contained components, has excellent storage stability and comfort when applied, and exhibits little difference in the feel when used before and after shaving. [Means for solving the problem]

[0011] As a result of intensive research to solve the above-mentioned problems, the present inventors have unexpectedly found that in a skin cosmetic preparation containing natural water having a specific hardness, and one or more selected from the group consisting of a glycerin monoalkyl ether having a solubility of 0.01% by mass or more in water at 25°C and having an antibacterial effect, the monoether of an alcohol having 6 to 10 carbon atoms and glycerin, and a glycerin monofatty acid ester having a solubility of 0.01% by mass or more in water at 25°C and having an antibacterial effect, the monoester of a fatty acid having 6 to 10 carbon atoms and glycerin, the simple addition of a dihydric alcohol having 3 to 6 carbon atoms and an acidic mucopolysaccharide improves the storage stability and comfort upon application, and reduces the difference in feel upon use before and after shaving. After further research, the present inventors have completed the present invention. That is, the present invention relates to the following.

[0012] [1] A skin cosmetic preparation containing the following component (A) in an amount of 10% by mass to 98% by mass, component (B) in an amount of 0.001% by mass to 0.4% by mass, component (C) in an amount of 0.5% by mass to 25% by mass, and component (D) in an amount of 0.00001% by mass to 0.05% by mass: (A) Natural water with a hardness of 10 mg / L to 200 mg / L; (B) one or more selected from the group consisting of glycerin monoalkyl ethers having a solubility of 0.01% by mass or more in water at 25°C and having an antibacterial effect, which are monoethers of glycerin and alcohols having 6 to 10 carbon atoms, and glycerin monofatty acid esters having a solubility of 0.01% by mass or more in water at 25°C and having an antibacterial effect, which are monoesters of glycerin and fatty acids having 6 to 10 carbon atoms; (C) dihydric alcohols having 3 to 6 carbon atoms, and (D) Acid mucopolysaccharides. [2] The skin cosmetic preparation according to [1], further comprising (E) 0.01% by mass to 10% by mass of an alkylene oxide derivative represented by the following formula (1):

[0013] [ka]

[0014] [In formula (1), Z represents a residue obtained by removing all hydroxyl groups from a hydroxy compound having 1 to 7 carbon atoms and 1 to 7 hydroxyl groups, and x represents an integer of 1 to 7. EO represents an oxyethylene group, PO represents an oxypropylene group, and BO represents an oxybutylene group, a represents the average number of moles added of the oxyethylene groups, b represents the average number of moles added of the oxypropylene groups, and c represents the average number of moles added of the oxybutylene groups, and 0≦a≦100, 0≦b≦60, and 0≦c≦5. However, a, b, and c are not 0 at the same time, and when a and b are not 0, the ratio of a to b (a / b) is 1 / 5 to 7 / 1. In addition, EO, PO, and BO may be added randomly or in blocks, and may be added randomly and in blocks.] [3] The skin cosmetic preparation according to [1] or [2], further comprising (F) 0.0001% by mass to 0.1% by mass of an extract of a citrus plant. Effect of the Invention

[0015] According to the present invention, it is possible to provide a skin cosmetic preparation which contains natural water and a glycerin monoalkyl ether or a glycerin monofatty acid ester having antibacterial effects, while suppressing precipitation of the contained components, has excellent storage stability and comfort when applied, and exhibits little difference in the feel when used before and after shaving. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Hereinafter, an embodiment of the present invention will be described. The present invention relates to a skin cosmetic preparation containing specific amounts of (A) natural water having a hardness of 10 mg / L to 200 mg / L, (B) one or more glycerin monoalkyl ethers having a solubility of 0.01% by mass or more in water at 25°C and having antibacterial effects, the monoethers being formed of glycerin and alcohols having 6 to 10 carbon atoms, and glycerin monofatty acid esters having a solubility of 0.01% by mass or more in water at 25°C and having antibacterial effects, the monoesters being formed of glycerin and fatty acids having 6 to 10 carbon atoms, (C) a dihydric alcohol having 3 to 6 carbon atoms, and (D) an acidic mucopolysaccharide (hereinafter also referred to as the skin cosmetic preparation of the present invention).

[0017] In the present invention, the term "skin cosmetic" refers to a cosmetic that is applied directly or indirectly to the skin by coating or spraying, etc., and specific examples thereof include basic cosmetics such as lotions, milky lotions, creams, etc., base cosmetics such as base lotions, base creams, etc., finishing (make-up) cosmetics such as foundations, fragrant cosmetics such as perfumes, hair colognes, etc., medicated cosmetics (quasi-drugs) such as anti-wrinkle cosmetics, whitening cosmetics, etc. Among these, basic cosmetics and medicated cosmetics for keeping the skin clean and healthy are preferred as skin cosmetics. In this specification, a numerical range defined using the symbol "~" is intended to include both the upper and lower limits of the range. For example, "2~5" means 2 or more and 5 or less.

[0018] <Component (A): Natural water with hardness of 10mg / L to 200mg / L> In the skin cosmetic of the present invention, the natural water contained as component (A) is natural water having a hardness of 10 mg / L to 200 mg / L calculated from the concentrations of calcium salts and magnesium salts contained therein. The natural water is not particularly limited as long as it has a hardness within the above range, and examples thereof include shallow well water, deep well water, spring water, mineral water, hot spring water, underground water, mineral water, etc., which are listed in the "Major Types of Raw Water" in the Notice of the Director-General of the Food Distribution Bureau No. 2 Food Distribution No. 1071 dated March 30, 1990. Any one of these natural waters may be used alone, or two or more types may be selected and used in combination. Furthermore, these natural waters may be used as they are after collection, or may be used after collection and subsequent filtration sterilization, heat sterilization, ozone sterilization, ultraviolet sterilization, etc. In the present invention, the hardness of natural water is the calcium and magnesium content converted into the amount of calcium carbonate (CaCO3), expressed in [mg / L], and can be calculated using the following simplified formula (2) (atomic weights: Ca=40, Mg=24.3, molecular weight: CaCO3=100).

[0019]

number

[0020] The natural water contained as component (A) in the skin cosmetic of the present invention has a hardness calculated using the above formula (2) of 10 mg / L to 200 mg / L, preferably 15 mg / L to 150 mg / L, and more preferably 20 mg / L to 100 mg / L. If the hardness is less than 10 mg / L, the comfort when applied may be insufficient or the difference in the feeling of use before and after shaving may be large, whereas if the hardness is more than 200 mg / L, the stability below freezing point may decrease or the comfort when applied may be impaired. Here, "difference in feel before and after shaving" refers to the difference between the smooth feel or stinging feel felt when applied to the skin before shaving and the smooth feel or stinging feel felt when applied to the skin after shaving. Therefore, "small difference in feel before and after shaving" means that the degree of change in feel after shaving is small compared to the feel before shaving (almost the same), and "large difference in feel before and after shaving" means that the degree of change in feel after shaving is large compared to the feel before shaving (decreased smoothness or increased stinging).

[0021] In the present invention, natural water having the above-mentioned hardness may be collected as component (A) and used as is or after collection, it may be subjected to filtration sterilization, heat sterilization, ozone sterilization, ultraviolet sterilization, etc., and commercially available products provided by various companies for use in cosmetics which are natural water having the above-mentioned hardness may also be used.

[0022] The content of component (A) relative to the total amount of the skin cosmetic of the present invention is 10% by mass to 98% by mass, preferably 20% by mass to 95% by mass, and more preferably 30% by mass to 90% by mass. If the content of component (A) is less than 10% by mass, the comfort upon application may be insufficient, or the difference in the sensation of use before and after shaving may be large. On the other hand, if the content of component (A) exceeds 98% by mass, the effect commensurate with the amount of the component (A) is not obtained.

[0023] <Component (B): one or more selected from the group consisting of glycerin monoalkyl ethers having a solubility of 0.01% by mass or more in water at 25° C. and having an antibacterial effect, which are monoethers of glycerin and alcohols having 6 to 10 carbon atoms, and glycerin monofatty acid esters having a solubility of 0.01% by mass or more in water at 25° C. and having an antibacterial effect, which are monoesters of glycerin and fatty acids having 6 to 10 carbon atoms> The skin cosmetic preparation of the present invention contains, as component (B), one or more compounds selected from the group consisting of glycerin monoalkyl ethers having an antibacterial effect, which are monoethers of glycerin and alcohols having 6 to 10 carbon atoms, and glycerin, which have a solubility in water at 25°C of 0.01% by mass or more, and glycerin monofatty acid esters having an antibacterial effect, which are monoesters of glycerin and fatty acids having 6 to 10 carbon atoms, which have an antibacterial effect, which have a solubility in water at 25°C of 0.01% by mass or more (hereinafter sometimes referred to as "glycerin derivatives" in this specification). In this specification, when a glycerin derivative dissolves up to 0.01 g in 100 g of water, the solubility of the glycerin derivative in water is defined as 0.01 mass%. The solubility of the glycerin derivative in water at 25°C is preferably 0.01 mass% to 1 mass%, and more preferably 0.05 mass% to 0.5 mass%. Glycerin monoalkyl ethers have a solubility in water of 0.01% by mass or more at 25° C. and have an antibacterial effect. Specific examples of monoethers of glycerin and alcohols having 6 to 10 carbon atoms include glycerin monohexyl ether (solubility in water at 25° C.: 1% by mass) and glycerin mono 2-ethylhexyl ether (solubility in water at 25° C.: 0.2% by mass). In addition, glycerin monofatty acid esters have a solubility in water of 0.01% by mass or more at 25° C. and have an antibacterial effect. Specific examples of monoesters of glycerin and fatty acids having 6 to 10 carbon atoms include glycerin monocaprylate ester (solubility in water at 25° C.: 0.05% by mass) and glycerin monocaprate ester (solubility in water at 25° C.: 0.01% by mass). As the component (B), the above glycerin derivatives may be used alone or in combination of two or more kinds.

[0024] In the present invention, as the component (B), the above-mentioned glycerin derivatives, which are commercially available products for use in cosmetics provided by various companies, can be used.

[0025] The content of component (B) relative to the total amount of the skin cosmetic of the present invention is 0.001% by mass to 0.4% by mass, preferably 0.01% by mass to 0.3% by mass, and more preferably 0.05% by mass to 0.2% by mass. If the content of component (B) is less than 0.001% by mass, the comfort upon application may be insufficient, whereas if the content of component (B) is more than 0.5% by mass, the stability below freezing point may decrease, or the difference in the feeling of use before and after shaving may be large.

[0026] <Component (C): Dihydric alcohol with 3 to 6 carbon atoms> The dihydric alcohol having 3 to 6 carbon atoms contained as component (C) in the skin cosmetic of the present invention is not particularly limited as long as it is an alcohol having 3 to 6 carbon atoms and having two hydroxyl groups in the molecule and can be used on the skin as a cosmetic component, but examples thereof include 1,2-propanediol (propylene glycol), 1,3-propanediol, 1,2-butanediol, 1,3-butanediol (1,3-butylene glycol), 1,4-butanediol, 2,3-butanediol, 1,2-pentanediol (pentylene glycol), 1,5-pentanediol, 1,2-hexanediol, dipropylene glycol, etc. For the purpose of the present invention, 1,3-propanediol, 1,3-butanediol and 1,2-pentanediol are preferably used, and 1,3-propanediol and 1,3-butanediol are more preferably used. As the component (C), the dihydric alcohol having 3 to 6 carbon atoms may be used alone or in combination of two or more kinds.

[0027] In the present invention, as the component (C), commercially available products provided by various companies as the above dihydric alcohols for cosmetic use can be used.

[0028] The content of component (C) relative to the total amount of the skin cosmetic of the present invention is 0.5% by mass to 25% by mass, preferably 2% by mass to 22% by mass, and more preferably 3% by mass to 20% by mass. If the content of component (C) is less than 0.5% by mass, the stability below freezing point may decrease or the comfort upon application may be insufficient. On the other hand, if the content of component (C) is more than 25% by mass, the comfort upon application may be impaired or the difference in the feeling of use before and after shaving may be large.

[0029] <Component (D): Acidic mucopolysaccharides> The acidic mucopolysaccharide contained as component (D) in the skin cosmetic of the present invention is a polysaccharide containing an amino sugar and having an acidic group such as a carboxyl group or a sulfate group, and can be used without any particular limitation as long as it can be used for cosmetics on the skin, and examples thereof include hyaluronic acid, chondroitin-4-sulfate, chondroitin-6-sulfate, dermatan sulfate, keratan sulfate, heparan sulfate, heparin, etc., and salts and acetylated products thereof can also be used. For the purpose of the present invention, hyaluronic acid, chondroitin-4-sulfate, chondroitin-6-sulfate, and salts and acetylated products thereof are preferred, hyaluronic acid, and salts and acetylated products thereof are more preferred, and salts of hyaluronic acid are most preferably used. In the present invention, the above-mentioned acid mucopolysaccharides are preferably those having a weight-average molecular weight, as measured by gel permeation chromatography (GPC), of 5,000 to 2,000,000, and more preferably those having a weight-average molecular weight of 8,000 to 1,800,000.

[0030] The salt of the acidic mucopolysaccharide is not particularly limited as long as it can be stably used in cosmetics and can be used on the skin, but inorganic salts can be used, and examples of the inorganic salt include alkali metal salts such as sodium salts and potassium salts. The salt of the acidic mucopolysaccharide is preferably sodium salts or potassium salts.

[0031] In the skin cosmetic composition of the present invention, as component (D), one type may be selected from the group consisting of acid mucopolysaccharides, their salts, and their acetylated products and used alone, or two or more types may be selected and used in combination.

[0032] In the present invention, as component (D), commercially available products provided by various companies as acid mucopolysaccharides for cosmetic use can be used. Examples of such commercially available products include sodium hyaluronate such as "Hyaluronic Acid Solution HA-LQH1P" manufactured by Kewpie Corporation, "Hyaluronic Acid FCH-200" manufactured by Kikkoman Biochemifa Corporation, "Exogenous Sodium Hyaluronate "Maruha" manufactured by Maruha Nichiro Corporation, and low molecular weight (weight average molecular weight = 10,000 or less) hyaluronic acid such as "Hyalo Oligo" manufactured by Kewpie Corporation. Also, examples of sodium chondroitin sulfate such as "Exogenous Sodium Chondroitin Sulfate" manufactured by Maruha Nichiro Corporation.

[0033] The content of component (D) relative to the total amount of the skin cosmetic of the present invention is 0.00001% by mass to 0.05% by mass, preferably 0.0001% by mass to 0.04% by mass, and more preferably 0.0005% by mass to 0.03% by mass. If the content of component (D) is less than 0.00001% by mass, the stability below freezing may decrease, the comfort upon application may be insufficient, and the difference in the feeling of use before and after shaving may be large. On the other hand, if the content of component (D) is more than 0.05% by mass, the comfort upon application may be impaired.

[0034] <Content ratio of components (A), (B), and (C)> In the skin cosmetic of the present invention, from the viewpoint of minimizing the difference in feel before and after shaving, the ratio of the content of component (A) to the content of component (C) [(A) / (C)], in mass ratio, is preferably 2 to 40, more preferably 4 to 30, and even more preferably 6 to 20. Furthermore, in the skin cosmetic of the present invention, from the viewpoint of improving comfort upon application, the ratio of the content of component (C) to the content of component (B) [(C) / (B)] is preferably 10 to 600, more preferably 20 to 400, and even more preferably 30 to 200, in mass ratio.

[0035] <Component (E): Alkylene oxide derivative> The skin cosmetic of the present invention may further contain, in addition to the above-mentioned components (A) to (D), (E) an alkylene oxide derivative represented by the following formula (1).

[0036] [ka]

[0037] [In formula (1), Z represents a residue obtained by removing all hydroxyl groups from a hydroxy compound having 1 to 7 carbon atoms and 1 to 7 hydroxyl groups, and x represents an integer of 1 to 7. EO represents an oxyethylene group, PO represents an oxypropylene group, and BO represents an oxybutylene group, a represents the average number of moles added of the oxyethylene groups, b represents the average number of moles added of the oxypropylene groups, and c represents the average number of moles added of the oxybutylene groups, and 0≦a≦100, 0≦b≦60, and 0≦c≦5. However, a, b, and c are not 0 at the same time, and when a and b are not 0, the ratio (a / b) of the average number of moles added of the oxyethylene groups to the average number of moles added of the oxypropylene groups is 1 / 5 to 7 / 1. In addition, EO, PO, and BO may be added randomly or in a block form, and may have a mixture of a randomly added portion and a block-added portion.]

[0038] In formula (1), Z is a hydroxy compound having 1 to 7 carbon atoms and 1 to 7 hydroxyl groups (Z(OH) x ) with all hydroxyl groups removed, and x represents the number of hydroxyl groups in the hydroxy compound and is an integer of 1 to 7. From the viewpoint of comfort during application, the hydroxy compound (Z(OH) x ) preferably has 2 or more carbon atoms, and more preferably has 3 or more carbon atoms. The above hydroxy compounds (Z(OH) xSpecific examples of the hydroxyl compounds include methanol, ethanol, propanol, butanol, propylene glycol, glycerin, trimethylolpropane, erythritol, pentaerythritol, glucose, sorbitan, methyl glucoside, diglycerin, xylitol, sorbitol, mannitol, inositol, and the like. In preparing the alkylene oxide derivative represented by formula (1), one of these hydroxyl compounds may be used, or a mixture of two or more of them may be used.

[0039] In formula (1), the oxyethylene group represented by EO is derived from ethylene oxide, and in formula (1), a is the average number of moles of oxyethylene groups added per hydroxyl group of the alkylene oxide derivative, which is 0 or more and 100 or less, preferably 1 or more and 20 or less, and more preferably 2 or more and 15 or less. In formula (1), the oxypropylene group represented by PO is an oxypropylene group derived from propylene oxide such as 1,2-propylene oxide, and b is the average number of moles of oxypropylene groups added per one hydroxyl group of the alkylene oxide derivative, which is 0 or more and 60 or less, preferably 0 or more and 15 or less, and more preferably 0 or more and 10 or less. In formula (1), the oxybutylene group represented by BO is an oxybutylene group derived from butylene oxide such as 1,2-butylene oxide, and c is the average number of moles of oxybutylene groups added per hydroxyl group of the alkylene oxide derivative, which is 0 or more and 5 or less, preferably 0 or more and 3 or less, and more preferably 0 or more and 2 or less.

[0040] In the alkylene oxide derivative represented by the above formula (1), the average number of moles a of added oxyethylene groups, the average number of moles b of added oxypropylene groups, and the average number of moles c of added oxybutylene groups are not all zero at the same time. In the above formula (1), when a is not 0, the average number of moles of oxyethylene groups added in the alkylene oxide derivative, a×x, is preferably 2 or more and 40 or less, and more preferably 4 or more and 30 or less. In the above formula (1), when b is not 0, the average number of moles of oxypropylene groups added in the alkylene oxide derivative, b×x, is preferably 1 or more and 30 or less, and more preferably 2 or more and 20 or less. In the above formula (1), when c is not 0, the average number of moles of oxybutylene groups added, c×x, in the above alkylene oxide derivative is preferably 1 or more and 6 or less, and more preferably 2 or more and 4 or less. In the above formula (1), when both the average number of moles a of oxyethylene groups added and the average number of moles b of oxypropylene groups added are not 0, the ratio thereof (a / b) is 1 / 5 to 7 / 1, and preferably 1 / 1 to 2 / 1.

[0041] In the alkylene oxide derivative represented by the above formula (1), the order in which the oxyethylene groups, oxypropylene groups and oxybutylene groups are added is not particularly specified, and they may be added randomly or in blocks, or there may be a mixture of randomly and block-like addition sites. In addition, in the alkylene oxide derivative represented by the above formula (1), any of an oxyethylene group, an oxypropylene group, and an oxybutylene group may be bonded to the terminal hydrogen atom, but when an oxybutylene group is added, it is preferable that the oxybutylene group is bonded to the terminal hydrogen atom.

[0042] For example, in the alkylene oxide derivative used in a preferred embodiment of the present invention, oxyethylene groups and oxypropylene groups are added randomly, and oxybutylene groups are added in blocks, and the oxybutylene groups are bonded to terminal hydrogen atoms. In the alkylene oxide derivative used in another preferred embodiment of the present invention, only an oxyethylene group or an oxypropylene group is added to the hydroxyl group. Furthermore, in the alkylene oxide derivative used in another preferred embodiment of the present invention, oxyethylene groups and oxypropylene groups are added to hydroxyl groups in a block or random manner. In the present invention, examples of alkylene oxide derivatives that are more preferably used as component (E) include derivatives in which oxyethylene groups and oxypropylene groups are added randomly to hydroxyl groups of glycerin, and further oxybutylene groups are added in block form and the oxybutylene groups are bonded to terminal hydrogen atoms, such as alkylene oxide derivative 2 described below, and derivatives in which oxyethylene groups and oxypropylene groups are added in block and random form to hydroxyl groups of butanol, such as alkylene oxide derivative 3 described below.

[0043] The alkylene oxide derivative represented by formula (1) can be produced by a known method. x ) is subjected to addition polymerization with ethylene oxide, propylene oxide (1,2-propylene oxide, etc.), butylene oxide (1,2-butylene oxide, etc.) as appropriate. The order and amount of each monomer added during addition polymerization can be determined depending on the desired structure. In addition, commercially available alkylene oxide derivatives such as "Macbiobride MG-10E", "Macbiobride MG-20E", "Macbiobride MG-10P", "Macbiobride MG-20P", "Wilbride S-753", "Wilbride MG-2070", and "Wilbride BS-03" (all manufactured by NOF Corporation) can also be used.

[0044] In the skin cosmetic of the present invention, one alkylene oxide derivative represented by the above formula (1) may be selected and used alone, or two or more may be selected and used in combination.

[0045] The content of component (E) relative to the total amount of the skin cosmetic of the present invention is preferably 0.01% by mass to 10% by mass, more preferably 0.05% by mass to 8% by mass, and even more preferably 0.1% by mass to 5% by mass. When the content of component (E) is within the above range, the stability at sub-freezing points is improved, and the comfort upon application is improved.

[0046] <Ingredient (F): Citrus plant extract> The skin cosmetic of the present invention may further contain (F) an extract of a citrus plant in addition to the above components (A) to (D) or the above components (A) to (E).

[0047] The citrus plant extract that can be contained as component (F) in the skin cosmetic composition of the present invention is an extract obtained by extracting a plant classified as a citrus fruit with a solvent. Plants classified as citrus fruits include plants belonging to the genera Citrus, Poncirus, and Fortunella in the subfamily Aurantioideae of the family Rutaceae. Plants belonging to the citrus genus include lime (Citrus aurantifolia), bergamot (Citrus bergamia), citron (Citrus medica), lemon (Citrus limon), pomelo (Citrus grandis), grapefruit (Citrus paradisi), hassaku (Citrus hassaku), summer mandarin (Citrus natsudaidai), sunpokan (Citrus sulcata), bitter orange (Citrus aurantium), sweet orange (Citrus sinensis), tankan (Citrus tankan), iyokan (Citrus iyo), hyuganatsu (Citrus tamurana), yuzu (Citrus junos), sudachi (Citrus sudachi), kabosu (Citrus sphaerocarpa), and satsuma mandarin (Citrus unshiu), mandarin (Citrus reticulata), tachibana (Citrus tachibana), and shekwasha (Citrus depressa). An example of a plant belonging to the genus Trifoliata is Trifoliata (Citrus trifoliata L.). Examples of plants belonging to the genus Fortunella include Citrus japonica, Fortunella margarita, Fortunella crassifolia, and the like. In the present invention, the plant used for preparing component (F) is preferably a plant belonging to the genus Citrus, more preferably Citrus depressa, Citrus tachibana, Citrus aurantium, lemon (Citrus limon), Citrus junos, grapefruit (Citrus paradisi), and even more preferably Citrus depressa, lemon (Citrus limon), and grapefruit (Citrus paradisi). In preparing the component (F) that can be contained in the skin cosmetic of the present invention, there is no particular limitation on the part of the plant classified as a citrus fruit that can be used, but the fruit, peel, seeds, fruit juice, etc. can be suitably used. The fruit, peel, seeds, etc. of the plant are subjected to extraction with an extraction solvent either as is or after drying, shredding, crushing, etc.

[0048] Examples of the extraction solvent used for extraction include water and polar solvents. Examples of polar solvents include esters such as ethyl acetate; ketones such as acetone; ethers such as diethyl ether, tetrahydrofuran, and polyhydric alcohol alkyl ethers (diethylene glycol ether, etc.); lower alcohols (methanol, ethanol, propanol, isopropanol, etc.), and polyhydric alcohols (propylene glycol, dipropylene glycol, 1,3-butylene glycol, glycerin, etc.). Among them, from the viewpoint of safety and extraction efficiency, water; lower alcohols such as methanol, ethanol, propanol, and isopropanol; and polyhydric alcohols such as propylene glycol, dipropylene glycol, 1,3-butylene glycol, and glycerin are preferred, and water, 1,3-butylene glycol, and glycerin are more preferred. The extraction solvent may be used alone or in combination of two or more. For the preparation of component (F), water, 1,3-butylene glycol, or a mixed solvent of water and 1,3-butylene glycol is more preferably used. The amount of the extraction solvent used is, for example, when the extraction solvent is water, usually 100 to 2000 parts by mass, preferably 200 to 1000 parts by mass, per 100 parts by mass of the plant body classified as citrus fruits.When the extraction solvent is a lower alcohol or a polyhydric alcohol, usually 100 to 5000 parts by mass, preferably 500 to 2000 parts by mass, per 100 parts by mass of the plant body classified as citrus fruits. When extracting from fruit juice obtained from a plant, the amount of the extraction solvent used is, for example, when the extraction solvent is water, usually 50 to 2000 parts by mass, and preferably 100 to 1000 parts by mass, per 100 parts by mass of the fruit juice. When the extraction solvent is a lower alcohol or a polyhydric alcohol, usually 50 to 2000 parts by mass, and preferably 100 to 1000 parts by mass, per 100 parts by mass of the fruit juice.

[0049] As the extraction method, a general method is adopted, for example, a method in which an extraction solvent is added to a plant body, the plant body is immersed, and the extraction is performed by leaving the plant body to stand or stirring, a method in which the plant body is homogenized in the extraction solvent, or a method in which the plant body is squeezed or the like to obtain a fruit juice and the extraction is performed by adding the extraction solvent to the fruit juice obtained by leaving the fruit juice to stand or stirring, etc. From the viewpoint of extraction efficiency, it is preferable to carry out the extraction operation after drying, cutting, crushing, etc. of the plant body, or to extract from the fruit juice obtained from the plant body. Examples of methods for drying the plant include air drying, warm drying, freeze drying, etc. The extraction temperature is appropriately determined depending on the type of extraction solvent used. For example, when the extraction solvent is water, the extraction temperature is usually about 20°C to 120°C, and when the extraction solvent is a lower alcohol or a polyhydric alcohol, the extraction temperature is usually about 30°C to 80°C. In the case of extraction by immersion, the extraction time is usually 1 hour or more, preferably 3 hours or more, more preferably 5 hours or more. From the viewpoint of extraction efficiency, the upper limit of the extraction time is usually 10 hours or less, preferably 8 hours or less. The number of extractions is not particularly limited, but it is preferable to perform extraction once using the above amount of extraction solvent.

[0050] After the above-mentioned extraction treatment, the extract can be recovered by filtration, centrifugation, etc. The obtained extract may be used as it is, or may be concentrated by distilling off the solvent, and if necessary, purified by treatment such as column chromatography or solvent fractionation, and further dried, etc. From the viewpoint of ease of handling, the obtained extract can be used after diluting with water or a polyhydric alcohol such as glycerin or 1,3-butylene glycol.

[0051] In the present invention, the citrus plant extract may be prepared by extracting from a plant classified as a citrus fruit as described above, concentrating, purifying, etc., or may be a commercially available cosmetic ingredient. Commercially available extracts usually contain 0.1% to 3% by mass of solids.

[0052] The content of component (F) relative to the total amount of the skin cosmetic of the present invention, converted into the solid content, is preferably 0.0001% by mass to 0.1% by mass, more preferably 0.0005% by mass to 0.05% by mass, and even more preferably 0.001% by mass to 0.02% by mass. When the content of component (F) is within the above range, the difference in feel before and after shaving is small.

[0053] <Water other than component (A)> The skin cosmetic of the present invention may contain normal water in addition to component (A). "Normal water" refers to ion-exchanged water or distilled water that is normally used in skin cosmetic preparations, which contains substantially no minerals and has a hardness of 0 mg / L or less than 1 mg / L. Furthermore, when an aqueous solution or dispersion of an acidic mucopolysaccharide, or a commercially available product in the form of an aqueous solution or dispersion is used as component (D), when an extract of a citrus plant in water, a dilution or aqueous solution of said extract in water, etc. is used as component (F), or when a component in the form of an aqueous solution or dispersion is used as another component described below, the skin cosmetic of the present invention contains water derived from these. Such water is the above-mentioned "normal water" such as ion-exchanged water or distilled water, and is substantially free of minerals and has a hardness of 0 mg / L or less than 1 mg / L. The normal water content in the skin cosmetic of the present invention is preferably 60% by mass or less, more preferably 40% by mass or less, and even more preferably 20% by mass or less.

[0054] <Other added ingredients> The skin cosmetic preparation of the present invention may further contain, in addition to the above-mentioned components (A) to (D), and further components (E) and (F), additive components generally used in cosmetics, within the scope of the present invention. Examples of such added components include moisturizers (glycerin, diglycerin, amino acids, etc.); emollients (olive fruit oil, ceramide, etc.); anti-inflammatory agents (dipotassium glycyrrhizinate, etc.); anti-wrinkle agents (niacinamide, etc.); whitening agents (ascorbyl glucoside, etc.); cell activators; astringents; oils; surfactants; preservatives; thickeners; pH adjusters; antioxidants; metal sequestering agents; UV absorbers; UV scattering agents; fragrances; colorants; pigments, etc. The content of other added components is preferably 40% by mass or less, and more preferably 30% by mass or less, of the total amount of the skin cosmetic.

[0055] The skin cosmetic of the present invention can be provided in the form of a liquid, gel, emulsion, cream, etc., as skin cosmetics such as lotion, beauty essence, emulsion, cream, etc.; base cosmetics such as base lotion, base cream, etc.; makeup cosmetics such as emulsion foundation, cream foundation, etc.; body cosmetics such as body lotion, body cream, etc.; medicinal cosmetics such as lotion, beauty essence, emulsion, cream, etc. for preventing wrinkles, whitening, etc. The skin cosmetic of the present invention can be produced according to a normal formulation method adopted depending on the form. For example, in the case of a liquid or gel-like skin cosmetic, it can be produced by mixing component (A): natural water having a hardness of 10 mg / L to 200 mg / L, component (B): one or more selected from the group consisting of a glycerin monoalkyl ether having a solubility of 0.01% by mass or more in water at 25°C and having an antibacterial effect, which is a monoether of an alcohol having 6 to 10 carbon atoms and glycerin, and a glycerin monofatty acid ester having a solubility of 0.01% by mass or more in water at 25°C and having an antibacterial effect, which is a monoester of a fatty acid having 6 to 10 carbon atoms and glycerin, component (C): a dihydric alcohol having 3 to 6 carbon atoms, and component (D): an acidic mucopolysaccharide, and further adding and mixing component (E): an alkylene oxide derivative, and component (F): a citrus plant extract, and adding and mixing other additive components as necessary, and homogenizing the mixture.

[0056] The skin cosmetic of the present invention contains natural water and a glycerin monoalkyl ether or a glycerin monofatty acid ester having antibacterial effects, while suppressing precipitation of the contained components, exhibiting excellent storage stability and comfort upon application, with little difference in the sensation of use before and after shaving. EXAMPLES

[0057] The present invention will be described in more detail below with reference to examples and comparative examples.

[0058] [Examples 1 to 22, Comparative Examples 1 to 5] Skin cosmetics (lotion) According to the formulation shown in Table 1, components (A) to (D) and ion-exchanged water were mixed and homogenized to prepare the skin cosmetics (lotions) of Examples 1 to 11. According to the formulation shown in Table 2, components (A) to (F) and ion-exchanged water were mixed and homogenized to prepare the skin cosmetics (lotions) of Examples 12 to 22. In addition, according to the formulation shown in Table 3, the components (A), (B), (B'), (C), and (D) and ion-exchanged water were mixed and homogenized to prepare the skin cosmetics (lotions) of Comparative Examples 1 to 5. In Tables 1 to 3, the value in the column corresponding to each component indicates the content (mass %) of that component relative to the total amount of the skin cosmetic (lotion), and a blank column indicates that the component is not contained. Additionally, "(A) / (C)" indicates the ratio (mass ratio) of the content of component (A) to the content of component (C), and "(C) / (B)" indicates the ratio (mass ratio) of the content of component (C) to the content of component (B). In Table 3, "-" in the columns corresponding to (A) / (C) and (C) / (B) indicates that the ratio cannot be calculated because component (C) or component (B) is not contained.

[0059] The following raw materials were used as the components (*1 to *10) in Tables 1 to 3. Other components were commercially available products provided for use in cosmetics. *1 Natural water 1: Mineral water with a hardness of 150 mg / L was used. *2 Natural water 2: Mineral water with a hardness of 50 mg / L was used. *3 Natural water 3: Mineral water with a hardness of 25 mg / L was used. *4 Acid mucopolysaccharide 1: "Hyaluronic acid solution HA-LQH1P" (aqueous solution containing 1% by mass of sodium hyaluronate (average molecular weight = 1,200,000 to 2,200,000) and 0.8% by mass of phenoxyethanol, manufactured by Kewpie Corporation) was used. The content in the table is the net content of sodium hyaluronate. *5 Acidic mucopolysaccharide 2: "Hyalooligo" (hydrolyzed hyaluronic acid (average molecular weight = 10,000 or less), manufactured by Kewpie Corporation) was used. *6 Alkylene oxide derivative 1: "Macbiobride MG-20P" (polyoxypropylene (20 mol) methyl glucoside, in formula (1), Z = methyl glucoside residue, a = 0, b = 5, c = 0, x = 4, manufactured by NOF Corporation) was used. *7 Alkylene oxide derivative 2: "Wilbride S-753" (polyoxybutylene (3 mol) polyoxyethylene (8 mol) polyoxypropylene (5 mol) glyceryl ether, in formula (1), Z = glycerin residue, a = 2.67, b = 1.67, a / b = 8 / 5, c = 1, x = 3, manufactured by NOF Corporation) was used. *8 Alkylene oxide derivative 3: "Wilbride BS-03" (polyoxyethylene (10 mol) polyoxypropylene (7 mol) butyl ether, in formula (1), Z = n-butanol residue, a = 10, b = 7, a / b = 10 / 7, c = 0, x = 1, manufactured by NOF Corporation) was used. *9 Grapefruit seed extract: Extract obtained by extracting grapefruit (Citrus paradisi) seeds with 10 times the mass of water (80°C, 3 hours) was used. The content in the table is the content converted to solid content. *10 Lemon juice extract: Extract obtained by extracting lemon (Citrus limon) juice with an equal mass of 1,3-butylene glycol (80°C, 3 hours). The content in the table is the content converted to solid content.

[0060] The skin cosmetics of the Examples and Comparative Examples were evaluated for stability at sub-zero temperatures, comfort upon application, and difference in feel upon use before and after shaving, as described below.

[0061] (1) Evaluation of stability at sub-zero temperatures Each skin cosmetic preparation of the Examples and Comparative Examples was stored at -5°C for one week, and the condition during storage and after returning to room temperature was observed, and the stability was evaluated according to the following evaluation criteria. The evaluation results are shown in Tables 1 to 3. The results were evaluated as passing, with "◎" and "◯" being given. <Evaluation criteria> ◎: No change in appearance even at -5℃, and no separation or precipitation was observed when returned to room temperature. ◯: At -5°C, changes in appearance such as turbidity were observed, but no separation or precipitation was observed when returned to room temperature. ×: After storage at -5°C, separation or precipitation was observed when the temperature was returned to room temperature.

[0062] (2) Evaluation of comfort when applied Twenty women aged 25 to 55 years old were selected as panelists, and each panelist took 1 g of each of the skin cosmetics of the Examples and Comparative Examples in the palm of their hand and applied it to their face, and scored the comfortability according to the following sensory evaluation criteria. The scores of the 20 panelists were calculated and the comfortability upon application was evaluated according to the following evaluation criteria. The evaluation results are shown in Tables 1 to 3. The number in parentheses below the evaluation results indicates the total evaluation score. Evaluations of "◎" and "○" were judged to be acceptable. <Sensory evaluation criteria> 2 points: There is absolutely no roughness or stinging upon application and it feels very comfortable. 1 point: There is almost no roughness or stinging when applied, and it feels comfortable. 0 points: If there is roughness and / or stinging upon application and it feels uncomfortable. <Evaluation criteria> ⊚: The total score is 35 points or more; the skin cosmetic is excellent in comfort when applied. ◯: The total score is 30 points or more and 34 points or less; the skin cosmetic is very comfortable to apply. Δ: The total score is 20 or more and 29 or less; the skin cosmetic is slightly less comfortable to apply. ×: The total score is 19 points or less; the skin cosmetic is poor in comfort when applied.

[0063] (3) Evaluation of the difference in usability before and after shaving Twenty women aged 25 to 55 years old were selected as panelists, and each panelist took 1 g of each of the skin cosmetics of the Examples and Comparative Examples on the palm of their hand, applied it to their face, and then shaved the facial hairs using a shaver. Then, 1 g of each of the skin cosmetics of the Examples and Comparative Examples was taken on the palm of their hand again, and applied it to their face. Each panelist scored the difference in the feeling of use when applied before shaving and when applied after shaving according to the following sensory evaluation criteria. The total score of the 20 panelists was calculated, and the difference in the feeling of use before and after shaving was evaluated according to the following evaluation criteria. The evaluation results are shown in Tables 1 to 3. The number in parentheses below the evaluation results indicates the total score. The evaluation of "◎" and "○" was judged to be acceptable. <Sensory evaluation criteria> 2 points: If you feel there is almost no difference in the smooth feeling or lack of stinging before and after shaving. 1 point: If you feel there is little difference in the smooth feeling or lack of stinging before and after shaving. 0 points: If you feel there is a difference in smoothness and lack of stinging before and after shaving. <Evaluation criteria> ⊚: Total score is 35 points or more; this is a skin cosmetic product with little difference in feel before and after shaving. ◯: The total score is 30 points or more and 34 points or less; this is a skin cosmetic product for which the difference in feel before and after shaving is quite small. Δ: The total score is 20 or more and 29 or less; this is a skin cosmetic product for which the difference in feel before and after shaving is somewhat large. ×: The total score is 19 points or less; this is a skin cosmetic product that shows a large difference in feel before and after shaving.

[0064] [Table 1]

[0065] [Table 2]

[0066] [Table 3]

[0067] As shown in Tables 1 and 2, all of the skin cosmetics of Examples 1 to 22 were evaluated as having good storage stability at sub-zero temperatures, excellent or very excellent comfort when applied, and little or very little difference in feel when used before and after shaving. In particular, the skin cosmetic preparation of Example 13, which contains components (A) to (D) in the more preferred amounts described above and in which the (A) / (C) and (C) / (B) values ​​are both within the more preferred ranges described above, the skin cosmetic preparations of Examples 19 and 20, which contain, in addition to components (A) to (D), as component (E), an alkylene oxide derivative 2 to which an oxyethylene group, an oxypropylene group, and an oxybutylene group have been added, and an alkylene oxide derivative 3 to which an oxyethylene group and an oxypropylene group have been added, respectively, and the skin cosmetic preparation of Example 22, which contains, in addition to components (A) to (D), a lemon juice extract as component (F), were all rated as "Excellent" in terms of storage stability below freezing point, comfort upon application, and difference in feel before and after shaving.

[0068] In contrast, as shown in Table 3, none of the skin cosmetics of Comparative Examples 1 to 5 were judged to be pass in any of the evaluation items. That is, the skin cosmetic preparation of Comparative Example 1, which did not contain component (A), was evaluated as being slightly inferior in comfort upon application and showing a slightly large difference in feel before and after shaving. The skin cosmetic preparation of Comparative Example 2, which did not contain component (B), was evaluated as being slightly inferior in terms of comfort upon application. The skin cosmetic preparation of Comparative Example 3, which contained phenoxyethanol as component (B') instead of component (B), was rated as being slightly less comfortable to apply and with a slightly larger difference in feel before and after shaving. The skin cosmetic preparation of Comparative Example 4, which did not contain component (C), was evaluated as having poor stability below freezing point and being somewhat inferior in comfort when applied. The skin cosmetic preparation of Comparative Example 5, which did not contain component (D), was evaluated as having poor stability below freezing point, being somewhat inferior in comfort when applied, and showing a somewhat large difference in feel before and after shaving.

[0069] Next, other examples of the skin cosmetic of the present invention will be described.

[0070] [Example 23] Gel-type skin cosmetic Based on the formulation shown in Table 4, a gel-type skin cosmetic was produced as follows. Note that the natural water 3, acidic mucopolysaccharide 1, alkylene oxide derivative 1, alkylene oxide derivative 3, and grapefruit seed extract in Table 4 were the same raw materials as those used in the production of Examples 1 to 22 above, and the other raw materials were products commercially available for use in cosmetics. The content of acidic mucopolysaccharide 1 in Table 4 indicates the net content of sodium hyaluronate, and the content of grapefruit seed extract indicates the content converted into the solid content. <Manufacturing method> The other additive components (13) and (14) were dispersed in a portion of the ion-exchanged water in advance to prepare an aqueous dispersion. Components (B), (C), and the other additive components (1) and (2) were added to component (A) and mixed and stirred to make the mixture uniform. Components (D) to (F) and the other additive components (6) to (11) were then added in order and mixed and dissolved. The aqueous dispersion prepared in advance and the other additive component (15) were then added to thicken the mixture, and a mixture of the other additive components (3) to (5) and (12) was added. The remainder of the ion-exchanged water was then added to make the total amount 100% by mass.

[0071] [Table 4]

[0072] [Example 24] Milky skin cosmetic Based on the formulation shown in Table 5, the following emulsion-type skin cosmetic preparations were produced. The natural water 3, acidic mucopolysaccharide 1, alkylene oxide derivative 2, alkylene oxide derivative 3, and lemon juice extract in Table 5 were the same raw materials as those used in the production of Examples 1 to 22 above. The Citrus depressa peel extract was an extract prepared by extracting Citrus depressa peel with 10 times the mass of 1,3-butylene glycol (80°C, 3 hours). The other raw materials used were products commercially available for use in cosmetics. The content of Acidic Mucopolysaccharide 1 in Table 5 indicates the net content of sodium hyaluronate, and the contents of the lemon juice extract and Citrus depressa peel extract are each indicated in terms of solid content. <Manufacturing method> The other additive components (18) and (19) were dispersed in a portion of the ion-exchanged water in advance to prepare an aqueous dispersion. The components (A) to (C), the other additive components (1) and (2), and the remaining portion of the ion-exchanged water were mixed and dissolved, and heated to 75°C to 80°C to prepare an aqueous phase. Meanwhile, the other additive components (3) to (10) were mixed and heated to 75°C to 80°C to homogenize and prepare an oil phase. The oil phase was added to the aqueous phase with stirring to emulsify, and cooled to 40°C. Components (D) to (F) and the other additive components (11) to (17) were added in order, mixed, and dissolved, and then the previously prepared aqueous dispersion and the other additive component (20) were added to thicken the mixture.

[0073] [Table 5]

[0074] The gel-type skin cosmetic preparation of Example 23 and the milky skin cosmetic preparation of Example 24 both had excellent storage stability at sub-zero temperatures and were comfortable to apply, with little difference in feel before and after shaving. [Industrial Applicability]

[0075] As described above in detail, the present invention can provide a skin cosmetic preparation which contains natural water and a glycerol monoalkyl ether or a glycerol monofatty acid ester having antibacterial effects, while suppressing precipitation of the contained components, has excellent storage stability and comfort when applied, and exhibits little difference in feel when used before and after shaving.

Claims

1. A skin cosmetic composition comprising 10% by mass to 98% by mass of the following component (A), 0.001% by mass to 0.4% by mass of component (B), 0.5% by mass to 25% by mass of component (C), and 0.00001% by mass to 0.05% by mass of component (D): (A) natural water having a hardness of 10 mg / L to 200 mg / L; (B) one or more selected from the group consisting of glycerin monoalkyl ethers having a solubility of 0.01% by mass or more in water at 25° C. and having an antibacterial effect, the monoether being made of a C6-10 alcohol and glycerin, and glycerin monofatty acid esters having a solubility of 0.01% by mass or more in water at 25° C. and having an antibacterial effect, the monoester being made of a C6-10 fatty acid and glycerin; (C) a dihydric alcohol having 3 to 6 carbon atoms, and (D) Acid mucopolysaccharides.

2. The skin cosmetic preparation according to claim 1, further comprising (E) 0.01% by mass to 10% by mass of an alkylene oxide derivative represented by the following formula (1): 【Chemistry 1】 [In formula (1), Z represents a residue obtained by removing all hydroxyl groups from a hydroxy compound having 1 to 7 carbon atoms and 1 to 7 hydroxyl groups, and x represents an integer of 1 to 7. EO represents an oxyethylene group, PO represents an oxypropylene group, and BO represents an oxybutylene group, a represents the average number of moles of the oxyethylene groups added, b represents the average number of moles of the oxypropylene groups added, and c represents the average number of moles of the oxybutylene groups added, and 0≦a≦100, 0≦b≦60, and 0≦c≦5. However, a, b, and c are not 0 at the same time, and when a and b are not 0, the ratio of a to b (a / b) is 1 / 5 to 7 / 1. In addition, EO, PO, and BO may be added randomly or in a block form, and may be added randomly and in a block form mixed together.]

3. The skin cosmetic preparation according to claim 1 or 2, further comprising (F) 0.0001% by mass to 0.1% by mass of an extract of a citrus plant.

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