Skin cosmetic

Abstract

To provide a skin cosmetic that materializes soft skin of a user after being applied with the skin cosmetic, and enables the user to have moisturizing feeling after applying the skin cosmetic to the skin of the user.SOLUTION: A skin cosmetic is provided, containing following components (A), (B), (C), (D), (E) and (F): (A) linear polysaccharide, (B) branched polysaccharide, (C) chain polyhydric alcohol, (D) sugar alcohol, (E) acidic amino acid and / or neutral amino acid, and (F) water.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to skin cosmetics.

Background Art

[0002] Conventionally, in lotions, those for improving the moisturizing feeling and its persistence have been studied. For example, Patent Document 1 describes a cosmetic containing one or more selected from the group consisting of an amino acid, an amino acid derivative, a protein and a protein derivative, and a specific polysaccharide, which has high moisturizing property, the effect thereof is maintained, and there is no sticky feeling.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Conventional skin cosmetics have had problems that the skin after application is not soft enough and the moisturizing feeling is not sufficiently felt.

Means for Solving the Problems

[0005] The present inventors have found that by using a combination of a linear polysaccharide, a branched polysaccharide, a chain polyhydric alcohol, a sugar alcohol, an acidic amino acid and / or a neutral amino acid, a film is formed on the skin after application, and a skin cosmetic can be obtained in which the skin after application is soft and a moisturizing feeling of the skin is felt.

[0006] The present invention provides the following components (A), (B), (C), (D), (E) and (F): (A) A linear polysaccharide, (B) A branched polysaccharide, (C) A chain polyhydric alcohol, (D) Sugar alcohols, (E) Acidic amino acids and / or neutral amino acids, (F)Water This relates to skin cosmetics containing [a specific ingredient]. [Effects of the Invention]

[0007] The skin cosmetic of the present invention forms a hydrogel film on the skin after application, resulting in soft skin and a feeling of moisturization. [Modes for carrying out the invention]

[0008] In this invention, component (A) is a linear polysaccharide, and component (B) is a branched polysaccharide. Polysaccharides are polymers with a primary structure in which monosaccharides are linked by glycosidic bonds. Their structure is determined by the type of monosaccharide and the bonding pattern. A linear structure is one in which monosaccharides are linked in a single chain, while a branched structure has branching points relative to the main chain of monosaccharides and has side chains.

[0009] The linear polysaccharide of component (A) is not limited to those commonly used in cosmetics, and may be derived from natural products or obtained through chemical synthesis. Furthermore, derivatives of polysaccharides obtained by attaching alkyl groups, hydroxyalkyl groups, polyalkylene oxide groups such as polyethylene oxide groups and polypropylene oxide groups, sugars such as glucose, lactose, and sucrose, or polymers that use these sugars as constituent units, to some of the sugars of polysaccharides are also considered to be similar to polysaccharides and are included in the polysaccharides of component (A).

[0010] Specifically, examples include agar, carrageenan, alginic acid, pectin, methylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, hydroxypropylmethylcellulose, carboxymethylcellulose, gellan gum, dextran, pullulan, hyaluronic acid, chondroitin sulfate, dermatan sulfate, chitin, chitosan, and other mucopolysaccharides. Of these, from the viewpoint of forming a good hydrogel film on the skin after application, improving the softness of the skin after application, and improving the moisturizing effect on the skin after application, it is preferable to include one or more selected from hyaluronic acid, carrageenan, methylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, carboxymethylcellulose, and agar, more preferably to include one or more selected from hyaluronic acid, carrageenan, and methylcellulose, and even more preferably to include at least hyaluronic acid.

[0011] Component (A) can be one or more types, and from the viewpoint of forming a good hydrogel film on the skin after application, improving the softness of the skin after application, and improving the moisturizing effect on the skin after application, the content is preferably 0.01 to 1% by mass of the total composition, more preferably 0.03 to 0.4% by mass, and even more preferably 0.08 to 0.2% by mass.

[0012] The branched polysaccharide of component (B) is not limited to those commonly used in cosmetics, and may be derived from natural products or obtained through chemical synthesis. Furthermore, derivatives of polysaccharides obtained by attaching alkyl groups, hydroxyalkyl groups, polyalkylene oxide groups such as polyethylene oxide groups and polypropylene oxide groups, sugars such as glucose, lactose, and sucrose, or polymers that use these sugars as constituent units, to some of the sugars of polysaccharides are also considered to be similar to polysaccharides and are included in the polysaccharides of component (B).

[0013] Specifically, examples include mucopolysaccharides such as locust bean gum, guar gum, tamarind gum, gum arabic, karaya gum, hydroxypropyl guar gum, xanthan gum, and Alcaligenes-producing polysaccharides. Of these, it is preferable to include one or more selected from xanthan gum and Alcaligenes-producing polysaccharides, and more preferably to include at least Alcaligenes-producing polysaccharides, from the viewpoint of forming a good hydrogel film on the skin after application. As the Alcaligenes-producing polysaccharide, the polysaccharide produced by Alcaligenes latus strain B-16 (FERM BP-2015), a bacterium of the genus Alcaligenes, is preferred. Furthermore, commercially available products such as "Alkasiran" (manufactured by Hakuto Co., Ltd.) can be used as the polysaccharide produced by Alkaligenes lethas B-16 strain.

[0014] Component (B) can be one or more types, and from the viewpoint of forming a good hydrogel film on the skin after application, improving the softness of the skin after application, improving the moisturizing effect on the skin after application, and being easy to take out and spread appropriately when used, the content is preferably 0.01 to 0.15% by mass of the total composition, more preferably 0.013 to 0.1% by mass, and even more preferably 0.017 to 0.05% by mass.

[0015] In the present invention, the mass ratio (A) / (B) of component (A) to component (B) is preferably 0.1 to 40, more preferably 0.8 to 20, even more preferably 1.9 to 11, and still more preferably 3.7 to 5.9, from the viewpoint of forming a good hydrogel film on the skin after application, improving the softness of the skin after application, improving the moisturizing effect on the skin after application, and being easy to take out and spread appropriately when used.

[0016] The chain-like polyhydric alcohol of component (C) is a compound with a chain structure, no cyclic structure, and containing two or more hydroxyl groups in its molecule. Any of these other than the sugar alcohol of component (D) that is commonly used in cosmetics is acceptable. Examples of the dihydric alcohol include ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol, propylene glycol, dipropylene glycol, tripropylene glycol, polypropylene glycol, 1,3 - butylene glycol, propanediol, and the like. Examples of the trihydric alcohol include glycerin, trimethylolpropane, and the like. Examples of the tetrahydric alcohol include diglycerin, and the like. Examples of the polyhydric alcohol having 5 or more valences include polyglycerin such as triglycerin, and the like. Among these, from the viewpoint of improving the softness of the skin after application and the moisturizing feeling of the skin after application, it is preferable to contain one or more selected from dihydric alcohols and trihydric alcohols, and it is more preferable to contain one or more selected from dipropylene glycol and glycerin. Further, it is preferable to contain dipropylene glycol and glycerin simultaneously.

[0017] When glycerin is contained in component (C), the content of glycerin is preferably 1 to 10% by mass, more preferably 2 to 15% by mass, and still more preferably 6 to 8.5% by mass in the total composition from the viewpoints of forming a good hydrogel film on the skin after application, improving the softness of the skin after application, and improving the moisturizing feeling of the skin after application.

[0018] Component (C) can be used singly or in combination of two or more, and it is preferable to use in combination of two or more. The content of component (C) is preferably 5 to 20% by mass, more preferably 6 to 18% by mass, and still more preferably 7 to 15% by mass in the total composition from the viewpoints of forming a good hydrogel film on the skin after application, improving the softness of the skin after application, and improving the moisturizing feeling of the skin after application.

[0019] In the present invention, the mass ratio (B) / (C) of component (B) to component (C) is preferably from 0.0005 to 0.03, more preferably from 0.0006 to 0.01, still more preferably from 0.0008 to 0.007, even more preferably from 0.001 to 0.0033, and most preferably from 0.0013 to 0.0016, from the viewpoints of forming a good hydrogel film on the skin after application, improving the softness of the skin after application, improving the moisturizing feeling of the skin after application, and forming a uniform, transparent and flexible film that adheres to the skin.

[0020] Examples of the sugar alcohol of component (D) include those commonly used in ordinary cosmetics, such as xylitol, sorbitol, maltitol, mannitol, malvitol, erythritol; polyoxyethylene alkyl glucosides such as polyoxyethylene (20 E.O.) methyl glucoside and polyoxyethylene ethyl glucoside, and polyoxyethylene propylene glucoside. Among these, from the viewpoints of forming a good hydrogel film on the skin after application and forming a uniform, transparent and flexible film that adheres to the skin, it is preferable to contain one or more selected from maltitol, sorbitol, and polyoxyethylene alkyl glucosides, and more preferably to contain one or more selected from maltitol and polyoxyethylene alkyl glucosides.

[0021] One or more kinds of component (D) can be used, and from the viewpoints of forming a good hydrogel film on the skin after application, improving the softness of the skin after application, improving the moisturizing feeling of the skin after application, and forming a uniform, transparent and flexible film that adheres to the skin, the content is preferably 1 to 12% by mass, more preferably 2 to 9% by mass, still more preferably 3 to 8% by mass, and even more preferably 3.5 to 6% by mass in the total composition.

[0022] In the present invention, the mass ratio (C) / (D) of component (C) to component (D) is preferably 0.42 to 20, more preferably 1 to 12, even more preferably 2.5 to 6.5, and even more preferably 3.46 to 4.1, from the viewpoint of forming a good hydrogel film on the skin after application, improving the softness of the skin after application, improving the moisturizing effect on the skin after application, and creating a uniform, transparent, flexible film that adheres to the skin.

[0023] Component (E) is an acidic amino acid and / or a neutral amino acid. Acidic amino acids are amino acids with an isoelectric point of less than 5. Examples include aspartic acid and glutamic acid. Neutral amino acids are amino acids with an isoelectric point of 5 to 6.5. Examples include glycine, trimethylglycine, alanine, valine, leucine, isoleucine, serine, threonine, phenylalanine, tyrosine, tryptophan, cystine, cysteine, methionine, proline, hydroxyproline, asparagine, and glutamine. Salts of these amino acids, N-alkyl compounds (e.g., N-methyl compounds), etc., can also be used.

[0024] As for component (E), from the viewpoint of improving the softness of the skin after application, neutral amino acids are preferred, more preferably containing one or more selected from N-methyl-L-serine, L-proline, L-alanine, glycine, and N-amidino-L-proline, even more preferably containing one or more selected from N-methyl-L-serine, L-alanine, and glycine, and even more preferably containing N-methyl-L-serine.

[0025] Component (E) can be one or more types, and from the viewpoint of forming a good hydrogel film on the skin after application, improving the softness of the skin after application, and improving the moisturizing effect on the skin after application, the content is preferably 0.01 to 1% by mass of the total composition, more preferably 0.03 to 0.4% by mass, and even more preferably 0.05 to 0.2% by mass.

[0026] In the present invention, the mass ratio (B) / (E) of component (B) to component (E) is preferably 0.01 to 15, more preferably 0.033 to 3.3, even more preferably 0.085 to 1, and still more preferably 0.33 to 0.45, from the viewpoint of forming a good hydrogel film on the skin after application, improving the softness of the skin after application, and improving the moisturizing effect on the skin after application.

[0027] In the present invention, the water content of component (F) is preferably 70 to 95% by mass, more preferably 75 to 90% by mass, and even more preferably 80 to 85% by mass, from the viewpoint of the skin feel and pleasant usability of the skin cosmetic.

[0028] From the viewpoint of improving the transparency of the appearance, the skin cosmetic composition of the present invention preferably contains 0.5% by mass or less of oil in the total composition, more preferably 0.2% by mass or less, even more preferably 0.1% by mass or less, and even more preferably contains no oil.

[0029] In addition to the above-mentioned components, the skin cosmetic composition of the present invention may contain components commonly used in cosmetics, such as surfactants, antioxidants, fragrances, preservatives, pH adjusters, blood circulation promoters, cooling agents, antiperspirants, bactericides, skin activators, moisturizers, cooling agents, and the like.

[0030] The skin cosmetic composition of the present invention can be manufactured according to conventional methods, for example, by the following method. (1) Prepare product 1 by mixing and dissolving component (E) in a portion of the water of component (F). (2) Add components (A), (B), and (C) to the remaining water in component (F) to prepare a solution in which they are completely dissolved, and then add component (D). Add preparation 1 to this and stir well until homogenized to produce a skin cosmetic.

[0031] The skin cosmetic composition of the present invention is preferably 10 to 1000 mPa·s, more preferably 20 to 900 mPa·s, and even more preferably 50 to 800 mPa·s at 25°C, from the viewpoint of being easy to take out into the hand and spreading appropriately when used. In this invention, viscosity is measured at 25°C using rotor No. 2 of a vismetron B-type viscometer (manufactured by Shibaura Semtec Co., Ltd.) at a rotation speed of 12 rpm for 30 seconds.

[0032] The cosmetic composition of the present invention is suitable as a solubilized cosmetic composition, preferably as an aqueous liquid cosmetic composition, and more preferably as a lotion. The cosmetic composition of this invention forms a hydrogel film on the skin after application, resulting in soft skin and a noticeable moisturizing effect. This hydrogel film contains moisture, is soft and flexible, and can follow the movements of the skin, preventing it from breaking down even when other cosmetics are applied afterward. [Examples]

[0033] Examples 1-12, Comparative Examples 1-4 Skin cosmetics (lotions) with the compositions shown in Table 1 were prepared, and their viscosity was measured. The physical properties of the film, the softness of the skin after application, and the moisturizing effect on the skin after application were also evaluated. The results are shown in Table 1.

[0034] (Manufacturing method) (1) Prepare product 1 by mixing and dissolving component (E) in a portion of the water of component (F). (2) Add components (A), (B), (C), polyglyceryl diisostearate, ethanol, and phenoxyethanol to the remaining water of component (F) to prepare a solution in which the components are completely dissolved, and then add component (D). Add preparation 1 to this and stir well until homogenized to produce a skin cosmetic (lotion).

[0035] (Evaluation method) (1) Viscosity: For each skin cosmetic product, the viscosity was measured at 25°C using a vismetron B-type viscometer (manufactured by Shibaura Semtec Co., Ltd.) with rotor No. 2 at a rotation speed of 12 rpm for 30 seconds.

[0036] (2) Physical properties of the coating: Five grams of each skin cosmetic were placed in a disposable plastic petri dish (PS, 40mm diameter) and left to stand in a 45°C constant temperature room for 24 hours. The formed film was then collected with tweezers and evaluated according to the following criteria. A score of 3 or higher was considered acceptable. 4; A uniform film is formed, and the film can be lifted with tweezers to remove 50% to 100% of the surface area of ​​the petri dish without tearing. 3; A uniform film is formed, and the film can be lifted with tweezers to peel off 20% to less than 50% of the surface area of ​​the petri dish without tearing. 2; A uniform film is formed, and the film can be lifted with tweezers to remove less than 20% of the surface area of ​​the petri dish without tearing. 1; A uniform film is not formed.

[0037] (3) Skin softness after application: Three expert evaluators applied 0.1g of each skin cosmetic to the inner forearm and then evaluated the softness of the skin when pressed with a finger, according to the following criteria. The results are shown as the total score from the three evaluators. 5; You can clearly feel the softness of your skin. 4; I can feel the softness of the skin. 3; I can feel a slight softness in the skin. 2; I don't really feel the softness of the skin. 1; I don't notice any noticeable softness in the skin.

[0038] (4) Moisture feeling of the skin after application: Three expert evaluators applied 0.1g of each skin cosmetic to the inner forearm and then evaluated the moisturizing sensation when touching the skin with their fingers, according to the following criteria. The results are shown as the total score from the three evaluators. 5; I can clearly feel the moisturizing effect. 4. I feel a moisturizing effect. 3; I feel a slight moisturizing effect. 2; I don't feel much moisturizing effect. 1. I don't feel any noticeable moisturizing effect.

[0039] [Table 1]

[0040] *1 Sodium hyaluronate (2): Hyaluronic acid FCH (FCH-SU), manufactured by Kikkoman Biochemifa Co., Ltd. *2 Sodium hyaluronate (2): Hyaluronic acid FCH (FCH-120), manufactured by Kikkoman Biochemifa Co., Ltd. *3 Alcaligenes letas B-16 polymer: Alkasirane, manufactured by Hakuto Co., Ltd. *4 Concentrated glycerin: RG-Co-K, manufactured by NOF Corporation. *5 Dipropylene glycol: DPG-RF, manufactured by ADEKA Corporation. *6 Maltitol solution (75% by mass of maltitol, 25% by mass of water): Amalty Syrup, manufactured by Mitsubishi Corporation Life Sciences Co., Ltd. *7 N-methyl-L-serine: N-methyl-L-serine, manufactured by Takasago Chemical Co., Ltd. *8 Polyglyceryl diisostearate:Matsunate MI-102, manufactured by Matsumoto Fine Chemical Co., Ltd.

[0041] Prescription Examples 1-3 Skin cosmetics with the compositions shown in Tables 2 to 4 were prepared in the same manner as in Examples 1 to 12. All of the resulting skin cosmetics form a uniform hydrogel film on the skin after application, leaving the skin feeling soft and moisturized.

[0042] [Table 2]

[0043] [Table 3]

[0044] [Table 4]

[0045] *9 Sodium hyaluronate (2): Hyaluronic acid FCH (FCH-200), manufactured by Kikkoman Biochemifa Co., Ltd. *10 Xanthan gum: SunAce C, manufactured by San-Ei Gen F.F.I. Co., Ltd. *11 Xanthan gum: Nomucoat ZZ, manufactured by San-Ei Gen F.F.I. Co., Ltd.

Claims

1. The following components (A), (B), (C), (D), (E) and (F): (A) a linear polysaccharide, (B) a branched polysaccharide; (C) a chain polyhydric alcohol, (D) a sugar alcohol, (E) N-methyl-L-serine, (F) Water A skin cosmetic comprising:

2. 2. The skin cosmetic according to claim 1, wherein the mass ratio (B) / (C) of component (B) to component (C) is 0.0005 to 0.

03.

3. 3. The skin cosmetic according to claim 1, wherein the mass ratio (C) / (D) of component (C) to component (D) is 0.42 to 20.

4. 3. The skin cosmetic preparation according to claim 1 or 2, wherein component (A) comprises one or more members selected from the group consisting of hyaluronic acid, carrageenan, methylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, carboxymethylcellulose, and agar.

5. 3. The skin cosmetic preparation according to claim 1 or 2, wherein component (B) comprises an Alcaligenes-produced polysaccharide.

6. 3. The skin cosmetic preparation according to claim 1 or 2, wherein component (D) comprises one or more members selected from the group consisting of maltitol and polyoxyethylene alkyl glucoside.