Skin cosmetic

Abstract

To provide skin cosmetics that are gentle on a skin, agree well with the skin, do not cause a tightening feel during application, do not leave the skin sticky after application, and offer sustained moisturizing effects.SOLUTION: Skin cosmetics contain following components (A), (B) and (C): (A) trimethylglycine, (B) ethyl glucoside, and (C) water.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to skin cosmetics.

Background Art

[0002] Conventionally, skin cosmetics have been required to have a high moisturizing effect. For example, Patent Document 1 describes that an external preparation containing collagen, hyaluronic acid or its salt, and trimethylglycine as a moisturizing agent has a very high moisturizing property. Further, Patent Document 2 describes that an external preparation containing sphingolipids, mucopolysaccharides, and amino acids improves skin conditions such as rough skin and atopic dermatitis.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] Conventional skin cosmetics with a high moisturizing effect were sticky when applied, had poor skin affinity, made a crunching sound during application, and were sticky after application. Also, although they had a moisturizing effect, their persistence was not fully satisfactory.

Means for Solving the Problems

[0005] The present inventor has found that by using trimethylglycine and ethyl glucoside in combination, a skin cosmetic can be obtained that is soft to the touch, has good skin affinity, has no crunching sound during application, is not sticky after application, and has excellent persistence of the moisturizing effect.

[0006] The present invention comprises the following components (A), (B), and (C): (A) Trimethylglycine, (B) Ethyl glucoside, (C)Water This relates to skin cosmetics containing [specific ingredients / materials]. [Effects of the Invention]

[0007] The skin cosmetic of the present invention is soft to the touch, blends well with the skin, does not feel sticky during application, does not leave the skin sticky after application, provides a moist finish, and has a smooth feel. Furthermore, it has excellent long-lasting moisturizing effect. [Modes for carrying out the invention]

[0008] The component (A) trimethylglycine used in this invention is an intramolecular salt compound also known as glycine betaine. Commercially available products such as Aminocoat (manufactured by Asahi Kasei Chemicals) and BETAFIN BP (manufactured by Finnfeeds Finland Ltd.) can be used.

[0009] The content of component (A) is preferably 0.01 to 10% by mass of the total composition, more preferably 0.05 to 8% by mass, even more preferably 0.08 to 3% by mass, and still more preferably 0.15 to 1% by mass, from the viewpoint of improving the softness of the feel on the skin when applied, improving skin compatibility when applied, reducing the feeling of tightness during application, and reducing stickiness of the skin after application.

[0010] Component (B), ethyl glucoside, is known as a fermentation product found in fermented products such as sake, but its origin is not restricted, and it may be a synthetic product. From the perspective of improving the effect of suppressing the increase in transepidermal water evaporation during skin irritation and reducing stickiness of the skin after application, it is preferable to use the α-form or a mixture of its structural isomers, which have been confirmed to have a skin-improving effect.

[0011] The content of component (B) is preferably 0.001 to 0.5% by mass, more preferably 0.0015 to 0.3% by mass, and even more preferably 0.01 to 0.1% by mass, in the total composition, from the viewpoint of improving skin compatibility during application, reducing the feeling of tightness during application, reducing stickiness of the skin after application, and improving the duration of the moisturizing effect on the skin after application.

[0012] In the present invention, the mass ratio (A) / (B) of component (A) to component (B) is preferably 1 to 400, more preferably 3 to 300, and even more preferably 13 to 140, from the viewpoint of improving skin compatibility during application, reducing the feeling of tightness during application, and reducing stickiness of the skin after application.

[0013] In the present invention, the water content of component (C) is preferably 65 to 97% by mass, more preferably 70 to 95% by mass, and even more preferably 75 to 90% by mass, from the viewpoint of improving the softness on the skin when applied and obtaining a smooth feel as a cosmetic.

[0014] The skin cosmetic composition of the present invention may further contain (D) water-soluble polysaccharides, which can improve the softness of the texture on the skin when applied, reduce the feeling of tightness during application, and improve the duration of the moisturizing effect on the skin after application. The water-soluble polysaccharide of component (D) is not limited to those commonly used in cosmetics, and may be derived from natural products or obtained through chemical synthesis.

[0015] 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 water-soluble polysaccharides of component (D).

[0016] Specifically, examples include mucopolysaccharides such as locust bean gum, guar gum, tamarind gum, quince seed gum, gum arabic, tragacanth gum, karaya gum, carrageenan, alginic acid and their salts, pectin, hydroxypropyl guar gum, methylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, carboxymethylcellulose, tuberose polysaccharide, xanthan gum, Alcaligenes letas-producing polysaccharide, gellan gum, dextran, pullulan, hyaluronic acid and their salts, chondroitin sulfate and its salts, dermatan sulfate and its salts, chitin, and chitosan. Of these, from the viewpoint of improving the softness of the product when applied to the skin, reducing the feeling of tightness during application, and improving the duration of the moisturizing effect on the skin after application, it is preferable to include one or more selected from hyaluronic acid and its salts, carrageenan, and xanthan gum, more preferably to include hyaluronic acid and its salts, and carrageenan (any of α, γ, or κ), and even more preferably to include hyaluronic acid and its salts. Furthermore, as for the hyaluronic acid salt, a salt of hyaluronic acid with an alkali metal is preferred, and a salt with sodium is more preferred.

[0017] Component (D) can be one or more types, and from the viewpoint of improving the softness of the feel on the skin when applied, improving skin compatibility when applied, reducing the feeling of tightness during application, reducing stickiness on the skin after application, and improving the duration of the moisturizing effect on the skin after application, the content is preferably 0.0005 to 0.05% by mass of the total composition, more preferably 0.0008 to 0.03% by mass, and even more preferably 0.0012 to 0.005% by mass.

[0018] In the present invention, the mass ratio (B) / (D) of component (B) to component (D) is preferably 1 to 150, more preferably 1.6 to 75, and even more preferably 7 to 17, from the viewpoint of improving the softness of the feel on the skin when applied, improving skin compatibility when applied, reducing the feeling of tightness during application, reducing stickiness on the skin after application, and improving the duration of the moisturizing effect on the skin after application.

[0019] The skin cosmetic of the present invention can further contain (E) polyhydric alcohol, which can improve the softness per unit area of the skin during application, reduce the squeaking feeling during application, improve the persistence of the moisturizing effect of the skin after application, enhance the storage stability of the cosmetic, and enable the improvement of the functions of the active ingredients. A polyhydric alcohol is a compound having two or more hydroxyl groups in the molecule, and any one can be used as long as it is used in a normal external preparation for skin. 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, etc. Examples of the trihydric alcohol include glycerin, trimethylolpropane, etc. Examples of the tetrahydric alcohol include diglycerin, erythritol, etc. Examples of the polyhydric alcohol having five or more valences include polyglycerin such as triglycerin; saccharides and sugar alcohols such as glucose, maltose, maltitol, sucrose, xylitol, sorbitol, maltitol, polyoxyethylene methyl glucoside, polyoxyethylene ethyl glucoside, polyoxyethylene propylene glucoside.

[0020] From the viewpoint of improving the softness per unit area of the skin during application, reducing the squeaking feeling during application, and improving the persistence of the moisturizing effect of the skin after application, the polyhydric alcohol as the component (E) preferably contains one or more selected from dihydric alcohols and trihydric alcohols, more preferably contains one or more selected from dipropylene glycol, 1,3-butylene glycol, propanediol, and glycerin, still more preferably contains one or more selected from dipropylene glycol, 1,3-butylene glycol, and glycerin, and even more preferably contains one or more selected from dipropylene glycol and glycerin. Moreover, it is preferable to simultaneously contain a dihydric alcohol and a trihydric alcohol, and it is more preferable to simultaneously contain dipropylene glycol and glycerin.

[0021] The polyhydric alcohol of component (E) can be used alone or in combination of two or more. From the viewpoint of improving the softness per skin during application and reducing the squeaking feeling during application, the content is preferably 1 to 35% by mass, more preferably 4 to 30% by mass, still more preferably 7 to 25% by mass, and even more preferably 8 to 20% by mass in the whole composition.

[0022] From the viewpoint of moderately improving the softness per skin during application, further alleviating the squeaking feeling during application, and reducing the stickiness of the skin after application, the skin cosmetic of the present invention can also contain an oil agent within a range that does not impair the plumpness feeling. The content of the oil agent is preferably 3% by mass or less, more preferably 1% by mass or less, still more preferably 0.5% by mass or less, and even more preferably 0.2% by mass or less in the whole composition.

[0023] In addition to the above components, the skin cosmetic of the present invention can contain components usually used in cosmetics, such as surfactants, antioxidants, fragrances, preservatives, pH adjusters, sequestering agents, blood circulation promoters, cooling agents, antiperspirants, bactericides, skin activators, moisturizers, cooling agents, etc.

[0024] The skin cosmetic of the present invention can be produced according to a usual method. When the skin cosmetic of the present invention contains components (D) and (E), for example, component (D) can be dispersed in component (E) to prepare a dispersion, and the skin cosmetic can be produced by mixing this dispersion with components (A), (B), (C), and other components.

[0025] From the viewpoint of improving the softness of the skin when applied and providing a dosage form that makes it easy to feel smooth, the viscosity of the skin cosmetic composition of the present invention at 25°C is preferably 0 to 3000 mPa·s, more preferably 0.5 to 2000 mPa·s, even more preferably 1 to 1500 mPa·s, and still more preferably 1.5 to 1000 mPa·s. In this invention, viscosity is measured at 25°C using a B-type viscometer (bismetron viscometer: model VDA2 (manufactured by Shibaura Semtec Co., Ltd.)). The measurement is performed within the following viscosity ranges under the following conditions. • For pressures between 2,500 mPa·s and less than 10,000 mPa·s: Rotor No. 3, rotation speed 12 rpm, 30 seconds. • If the pressure is between 500 mPa·s and less than 2,500 mPa·s, use rotor No. 2, rotation speed 12 rpm, 30 seconds. • If pressure is less than 500 mPa·s, use rotor No. 1, rotation speed 12 rpm, 30 seconds.

[0026] The skin cosmetic composition of the present invention is suitable as a solubilized or aqueous cosmetic composition, with aqueous cosmetic composition being preferred, aqueous liquid cosmetic composition being more preferred, and lotion being even more preferred. [Examples]

[0027] Examples 1-10, Comparative Examples 1-2 Skin cosmetics (lotions) with the compositions shown in Table 1 were manufactured, and their softness on the skin, ease of absorption, lack of stickiness during application, lack of stickiness after application, and duration of moisturizing effect were evaluated. The results are also shown in Table 1.

[0028] (Manufacturing method) A dispersion was prepared by dispersing component (D) in component (E). This dispersion was mixed with components (A), (B), (C), and other components to produce a skin cosmetic (lotion).

[0029] (Evaluation method) (1) Softness against the skin: Three professional evaluators, all without makeup, sensory-evaluated the "softness on the skin" of 1.5 mL of each skin cosmetic applied to their face after washing, using the following evaluation criteria. The results are shown as the total score from the three evaluators. Furthermore, "softness on the skin" when applied refers to a smooth, non-watery feel on the skin upon application, and the cosmetic product not being overly thick. 5 points: Very soft. 4 points: Soft. 3 points: Slightly soft. 2 points: Not very soft. 1 point: Not soft.

[0030] (2) Good skin compatibility: Three professional evaluators, all without makeup, sensory-evaluated the "skin absorption" of 1.5 mL of each skin cosmetic product applied to their face after washing, using the following criteria. The results are shown as the total score from the three evaluators. 5 points: Very easy to use. 4 points: It blends well. 3 points: Somewhat familiar. 2 points: It's not very familiar. 1 point: It doesn't blend well.

[0031] (3) No squeaky feeling during application: Three professional evaluators, who were not wearing any makeup, applied 1.5 mL of each skin cosmetic to their faces after washing and evaluated the lack of any squeaky feeling during application according to the following criteria. The results are shown as the total score of the three evaluators. Furthermore, "no squeaky feeling during application" means that when applied, the fingers do not feel any resistance against the skin, and it spreads smoothly on the skin until it is fully absorbed. 5 points: Clearly no creaking sound. 4 points: No squeaking sensation. 3 points: There isn't much creaking. 2 points: There is a slight creaking sound. 1 point: It has a creaky feel.

[0032] (4) No stickiness on the skin after application: Three professional evaluators, all without makeup, applied 1.5 mL of each skin cosmetic to their cleansed faces and then sensory-evaluated the non-greasy feeling of each product according to the following criteria. The results are shown as the total score from the three evaluators. 5 points: Clearly no stickiness. 4 points: Not sticky. 3 points: Not very sticky. 2 points: Slightly sticky. 1 point: It's sticky.

[0033] (5) Durability of moisturizing effect: Three professional evaluators, all without makeup, applied 1.5 mL of each skin cosmetic to their faces after washing, and evaluated the moisturizing effect after one hour, according to the following criteria. The results are shown as the total score from the three evaluators. 5 points: Clearly moisturizes well. 4 points: It feels moisturizing. 3 points: It has a slightly moisturizing feel. 2 points: It doesn't provide much moisture. 1 point: It doesn't feel moisturizing.

[0034] [Table 1]

[0035] <Example Form 1: Moisturizing Lotion> 1. Trimethylglycine 0.5 (mass%) 2. Ethyl glucoside 0.02 3. Dipropylene glycol 6.0 4.1,3-Butylene glycol 5.0 5. Concentrated glycerin 4.0 6. PEG-75 (*1) 0.5 7. PEG-20 (*2) 0.5 8. Polyoxyethylene hydrogenated castor oil (60 E.O.) 0.1 9. Polyoxyethylene methylpolysiloxane copolymer (*3) 0.05 10. Sodium hyaluronate (2) 0.002 11. Fermented soy milk liquid 0.1 12. Spruce extract 0.1 13. Watercress extract 0.1 14. Apricot juice 0.1 15. Citric acid 0.05 16. Sodium citrate 0.05 17. Phenoxyethanol 0.5 18.Fragrance 0.005 19. Purified water remainder Total 100.0 (*1) Polyethylene glycol 4000 (manufactured by NOF Corporation) (*2) Polyethylene glycol 1000 (manufactured by NOF Corporation) (*3) Silicone KF-6011 (manufactured by Shin-Etsu Chemical Co., Ltd.)

[0036] <Formulation Example 2: Milky Moisturizing Lotion> 1. Trimethylglycine 0.5 (mass%) 2. Ethyl glucoside 0.02 3. Ethanol 8.0 4. Hydrogenated soybean phospholipid 0.5 5. Cholesterol 0.25 6. Dipropylene glycol 5.0 7. Concentrated glycerin 3.0 8. Diglycerin (*4) 1.0 9. Polyquaternium-51 (*5) 0.5 10. Xanthan gum 0.002 11. Alcaligenes-produced polysaccharide 0.003 12. Yeast extract 0.1 13. Aluminum starch octenyl succinate (*6) 0.5 14. Phenoxyethanol 0.2 15. Purified water remainder Total 100.0 (*4) Diglycerin 801 (manufactured by Sakamoto Pharmaceutical Co., Ltd.) (*5) LIPIDURE-PMB (PH10) (manufactured by Nippon Seika Co., Ltd.) (*6)DRY-FLO PURE (manufactured by Nouryon)

[0037] <Formulation Example 3: Sheet Mask Impregnation Solution> 1. Trimethylglycine 1.0 (mass%) 2. Ethyl glucoside 0.05 3. Concentrated glycerin 5.0 4. Sorbitol solution 4.0 5.1,3-Butylene glycol 4.0 6. PEG-20 1.0 7. Glycosyltrehalose (*7) 1.0 8. Polyoxyethylene hydrogenated castor oil (60 E.O.) 0.3 9. Polyoxyethylene coconut oil fatty acid sorbitan (20E.O.) 0.2 10. Cyclohexanedicarboxylic acid bisethoxydiglycol (*8) 0.1 11. Polyquaternium-51 0.5 12. Carrageenan 0.01 13. Xanthan gum 0.02 14. L-ascorbic acid 2-glucoside 0.5 15. Niacinamide 0.1 16. Dipotassium glycyrrhizinate 0.05 17. Potassium hydroxide 0.1 18. Citric acid 0.05 19. Sodium citrate 0.05 20. EDTA-2Na 0.01 21. Methylparaben 0.1 22. Phenoxyethanol 0.3 23.Fragrance 0.01 24.Purified water remainder Total 100.0 (*7) Tornare (manufactured by Hayashibara Co., Ltd.) (*8) NEOSOLUE-AQULIO (manufactured by Nippon Seika Co., Ltd.)

[0038] <Prescription Example 4: Aftershave Lotion> 1. Trimethylglycine 0.7 (mass%) 2. Ethyl glucoside 0.03 3. Ethanol 12.0 4. Polyoxyethylene methyl glucoside (20E.O.) (*9) 0.5 5. Concentrated glycerin 3.0 6.1,3-Butylene glycol 4.0 7. Cyclohexanedicarboxylic acid bisethoxydiglycol 5.0 8. Hydrogenated soybean phospholipid 0.5 9. Polyoxyethylene polyoxypropylene decyl Tetradecyl ether (30 E.O.) (6 P.O.) (*10) 0.4 10. Sodium hyaluronate (2) 0.002 11. Hydroxypropyl methylcellulose 0.003 12. Dipotassium glycyrrhizinate 0.1 13. Isopropylmethylphenol 0.01 14. l-menthol 0.05 15. Lactic acid 0.02 16. Sodium hydroxide (appropriate amount) 17. Purified water remainder Total 100.0 (*9) MacBioBride MG-20E (manufactured by NOF Corporation) (*10) NIKKOL SG-DTD630 (manufactured by Japan Surfactant Industry Co., Ltd.)

[0039] <Example prescription 5: Emulsion> 1. Trimethylglycine 3.0 (mass%) 2. Ethyl glucoside 0.05 3. Ethanol 5.0 4.1,3-Butylene glycol 5.0 5. Dipropylene glycol 5.0 6. Concentrated glycerin 2.0 7. Octyldodecyl myristate 1.0 8. Macadamia nut oil 0.5 9. Squalane 0.5 10. Hydrogenated soybean phospholipid 0.3 11. Cholesterol 0.2 12. PEG-75 0.2 13. N-methyl-L-serine 0.15 14. Acrylic acid / alkyl methacrylate copolymer (*11) 0.1 15. Polyquaternium-51 0.1 16. Xanthan gum 0.02 17. Sodium hyaluronate (2) 0.005 18. Soy milk fermented liquid 0.1 19. Spruce extract 0.1 20. Olive leaf extract 0.1 21. Water-soluble collagen 0.1 22. N-acetylglucosamine 0.01 23. EDTA-2Na 0.02 24. Phenoxyethanol 0.3 25.Fragrance 0.05 26.Purified water remainder Total 100.0 (*11) PEMULEN TR-1 (manufactured by Lubrizol)

[0040] The fragrance used in the example formulation is the following floral blended fragrance. The 1% DPG, 5% DPG, and 10% DPG listed in the ingredient names indicate that these are dipropylene glycol solutions with active ingredient content of 1% by mass, 5% by mass, and 10% by mass, respectively.

[0041] Floral fragrance blend formulation content (by mass) Bergamot oil (natural fragrance) 2.0 Lemon oil (natural fragrance) 3.5 Grapefruit oil (natural fragrance) 1.0 Linaleel Acetate 1.5 Methyl anthranilate 0.2 Petigrain oil (natural fragrance) 0.5 Aurantiol 10% DPG (Also known as: Schiff base of hydroxycitronellal and methyl anthranilate) 1.0 Amyl allyl glycolate 1% DPG 0.5 Galbanum oil 1% DPG (natural fragrance) 0.1 Blackcurrant Buzz Absolute 10% DPG (Natural Fragrance) 1.5 Tagetes Oil 10% DPG (Natural Fragrance) 0.8 Ylang-ylang oil extra (natural fragrance) 2.0 Benzyl acetate 5.0 Methyldihydrojasmonate 13.0 Cisjasmon 10% DPG 1.0 Jasmine absolute (natural fragrance) 0.5 Indole 5% DPG 0.5 Alpha-hexyl cinnamic aldehyde 1.5 L-Citronellol 0.5 Geranium oil (natural fragrance) 0.5 Rose oil (natural fragrance) 0.5 Rose absolute (natural fragrance) 0.5 Damascenone 1% DPG 0.5 L-Rose Oxide 1% DPG 0.5 Dimethylbenzylcarbonyl acetate 1.0 Hydroxycitronellal 3.0 Alpha-isomethylionone (Alternate name: 5-(2,2,6-trimethyl-2-cyclohexenyl)-3-methyl-3-buten-2-one) 4.0 Oris Concrete 10% DPG (natural fragrance) 0.8 Methyl eugenol 0.5 Iso E Super (Also known as: 7-acetyl-1,2,3,4,5,6,7,8-octahydro-1,1,6,7-tetramethylnaphthalene) 2.5 Beltfick School (Also known as: 4-acetyl-trimethyl-6,8α-ethano-1,2,3,5,6,7,8,8α-octahydronaphthalenone) 4.0 Vetiver acetate 2.0 Sandalwood oil (natural fragrance) 1.5 Bagdanol 10% DPG (Also known as: 2-ethyl-4-(2,2,3-trimethyl-3-cyclopenten-1-yl)-2-buten-1-ol) 1.0 Patchouli oil 10% DPG (natural fragrance) 0.2 Evernir 10% DPG (Also known as: methyl-2,4-dihydroxy-3,6-dimethylbenzoate) 1.5 GalakSolid 50% Benzyl Benzoate (Also known as: 4,6,6,7,8,8-hexamethyl-1,3,4,6,7,8-hexahydrocyclopentabenzopyran) 10.0 Cyclopentadecanorid 4.0 Coumarin 0.5 Vanillin 10% DPG 0.5 Ethyl vanillin 10% DPG 2.5 Gamma-undecalactone 10% DPG 1.5 Gammadecalactone 10% DPG 1.5 Labdanum Absolute 10% DPG (Natural Fragrance) 0.5 Dipropylene glycol remaining amount Total 100

[0042] The skin cosmetics in formulation examples 1-5 are all soft on the skin, blend well, do not feel sticky during application, do not leave the skin feeling greasy after application, provide a moist finish with a smooth feel, and have excellent long-lasting moisturizing effects.

Claims

1. The following components (A), (B) and (C): (A) trimethylglycine, (B) ethyl glucoside, (C) Water A skin cosmetic comprising:

2. 2. The skin cosmetic according to claim 1, wherein the mass ratio (A) / (B) of component (A) to component (B) is 1 to 400.

3. 3. The skin cosmetic according to claim 1, wherein the content of component (A) is 0.01 to 10% by mass.

4. The skin cosmetic preparation according to claim 1 or 2, further comprising (D) a water-soluble polysaccharide.

5. 5. The skin cosmetic according to claim 4, wherein the mass ratio (B) / (D) of component (B) to component (D) is 1 to 150.