Oil-in-water emulsion

Abstract

The invention relates to an oil-in-water emulsion comprising (a) at least one plant-derived ingredient selected from the group consisting of Hibiscus abelmoschus Extract, Pholiota Microspora Polysaccharides and Pyrus Cydonia Seed Extract, (b) niosomes comprising at least one nonionic surfactant, (c) a thickener different from component (a), (d) an oil agent and (e) an aqueous medium.

Description

DESCRIPTIONTitle of InventionOIL-IN-WATER EMULSIONTechnical Field

[0001] The present invention relates to an oil-in-water emulsion.Background Art

[0002] Silicone is widely used in cosmetics to improve stickiness and impart a moisturizing effect. With increasing consumer awareness of environmental issues in recent years, there has been a rapid increase in requirements for cosmetics that do not use the synthetic polymer compound silicone (Japanese Patent Public Inspection No. 2014- 533288, for example).Technical Problem

[0003] In light of this background, it is an object of the present invention to provide an oil-in-water emulsion that does not use silicone (i.e., is silicone-free), while also exhibiting an excellent moisturizing effect without stickiness.Solution to Problem

[0004] In order to provide an oil-in-water emulsion that does not use silicone, while exhibiting an excellent moisturizing effect without stickiness, one aspect of the present invention relates to the following composition: an oil-in-water emulsion comprising (a) at least one plant- derived ingredient selected from the group consisting of: Hibiscusabelmoschus Extract, Pholiota Microspora Polysaccharides, and Pyrus Cydonia Seed Extract, (b) niosomes comprising at least one nonionic surfactant, (c) a thickener different from component (a), (d) an oil agent, and (e) an aqueous medium. As used herein, "(a) at least one plant- derived ingredient selected from the group consisting of: Hibiscus abelmoschus Extract, Pholiota Microspora Polysaccharides, and Pyrus Cydonia Seed Extract " may also be referred to as "component (a)", and the other components may be referred to in a similar manner.

[0005] In a particular embodiment, the nonionic surfactant in component (b) is a polyglycerol fatty acid ester.

[0006] In a particular embodiment, component (c) includes one or more compounds selected from the group consisting of (meth)acrylic polymers, and polysaccharides different from those contained in component (a).

[0007] In a particular embodiment, component (d) includes a vegetable oil.

[0008] In a particular embodiment, the oil-in-water emulsion further comprises an electrolyte.

[0009] In a particular embodiment, the oil-in-water emulsion is silicone-free.

[0010] In a particular embodiment, the content of component (a) ranges from 0.5 to 30 mass%, preferably from 0.8 to 28 mass%, and more preferably from 1 to 25 mass%, based on the total mass of the oil- in-water emulsion.

[0011] In a particular embodiment, the content of component (b) ranges from 0.1 to 5 mass%, preferably from 0.3 to 4.5 mass%, morepreferable from 0.5 to 4 mass%, based on the total mass of the oil-in- water emulsion.

[0012] In a particular embodiment, the content of component (c) ranges from 0.1 to 3 mass%, preferably from 0.15 to 2.8 mass%, more preferable from 0.2 to 2.5 mass%, based on the total mass of the oil-in- water emulsion.

[0013] In a particular embodiment, the oil-in-water emulsion is prepared as a lotion, milk, an essence, makeup remover, a makeup base, a foundation or a concealer.

[0014] Another aspect of the invention relates to a cosmetic process for caring for and / or making-up keratinic materials, comprising the application onto keratinic materials, in particular onto the skin, of an oil-in-water emulsion as described herein.Advantageous Effects of Invention

[0015] As demonstrated in the Examples, the invention provides an oil-in-water emulsion that does not use silicone (i.e., is silicone-free), while also exhibiting an excellent moisturizing effect without stickiness.Detailed description of the invention

[0016] Embodiments of the invention will now be described. However, the present invention is not limited to the described embodiments.Component (a)

[0017] The oil-in-water emulsion of the invention comprises (a) at least one plant-derived ingredient selected from the group consisting of Hibiscus Abelmoschus Extract, Pholiota Microspora Polysaccharides, and Pyrus Cydonia Seed Extract.

[0018] As used herein, "Hibiscus Abelmoschus Extract" refers to an extract obtained from the entire plant of Hibiscus Abelmoschus (specifically one or more parts selected from the roots, leaves, stems, flowers, seeds and fruit of Hibiscus Abelmoschus). As used herein, "Pyrus Cydonia Seed Extract" refers to an extract obtained from the seeds of the quince (Cydonia oblonga). The Hibiscus Abelmoschus Extract and the Pyrus Cydonia Seed Extract may be extracts obtained using water, or extracts obtained using a mixed solvent of water with a water-soluble solvent (for example, a monool such as ethanol, propyl alcohol or isopropyl alcohol; or a polyhydric alcohol such as ethylene glycol, propanediol (1,2-propanediol, 1,3 -propanediol), propylene glycol, butylene glycol, pentylene glycol (1,2-pentanediol), hexylene glycol, 1 ,2-hexanediol, glycerin, and mixtures thereof), but it is preferably an extract obtained using a mixed solvent of a polyhydric alcohol with water. An example of a commercial Hibiscus Abelmoschus Extract product to be used is ABELMOSK E5822 (marketed by SINA BT) which contains water, glycerin and 1 ,2- hexanediol as an extraction solvent. An example of a commercial Pyrus Cydonia Seed Extract product to be used is QUINCESEED 2 SP (marketed by DAINIHON KASEI) which contains water, glycerin and butylene glycol as an extraction solvent.

[0019] As used herein, “Pholiota Microspora Polysaccharides" refers to a fraction of polysaccharides isolated from Foliophylla. Here, Foliophylla is a type of mushroom belonging to the genus Pholiota of the family Strophariaceae. An example of a commercial Pyrus Cydonia Seed Extract product to be used is PHOLITECT BG(marketed by KOKEN) which contains water and butylene glycol as a solvent.

[0020] In a particular embodiment, the content of component (a) ranges from 0.5 to 30 mass%, preferably from 0.8 to 28 mass%, and more preferably from 1 to 25 mass%, based on the total mass of the oil- in-water emulsion. Indeed, the Applicant surprisingly found that if the content of component (a) is within this range, it provides a much better moisturizing effect and a non-sticky feel.Component (b)

[0021] The oil-in-water emulsion of the invention also comprises (b) niosomes comprising a nonionic surfactant. The term "niosomes", as used herein, refers to bilayer membrane closed vesicles formed by a nonionic surfactant.

[0022] The present inventors surprisingly found that component (a) makes it possible to impart a silicone-like, non-sticky feel and a moisturizing effect to the composition, while combination of component (a) with niosomes allows the formation of a stable emulsion.

[0023] Examples of nonionic surfactants for component (b) include polyglycerol fatty acid esters (for example, polyglyceryl-2 laurate, polyglyceryl-2 stearate, polyglyceryl-2 oleate, polyglyceryl-2 isostearate, polyglyceryl-4 isostearate, polyglyceryl- 10 laurate, polyglyceryl- 10 myristate, polyglyceryl- 10 stearate, polyglyceryl- 10 oleate, poly glyceryl- 10 isostearate, polyglyceryl-2 diisostearate, polyglyceryl-3 diisostearate and polyglyceryl- 10 diisostearate), glycerol fatty acid esters (for example, glyceryl myristate, glyceryl stearate, glyceryl isostearate, glyceryl oleate and glyceryl diisostearate),sorbitan fatty acid esters (for example, sorbitan monolaurate, sorbitan monopalmitate, sorbitan monostearate, sorbitan monoisostearate, sorbitan monooleate, sorbitan tristearate and sorbitan trioleate), sucrose fatty acid esters, polyoxyethylene alkyl ethers (for example, polyoxyethylene lauryl ether, polyoxyethylene cetyl ether, polyoxyethylene stearyl ether and polyoxyethylene oleyl ether), polyoxyethylene alkylphenyl ethers, alkyl glucosides (for example, decyl glucoside, lauryl glucoside and cocoglycoside), polyethylene glycol fatty acids (for example, polyethyleneglycol monolaurate and polyethyleneglycol monostearate), polyoxyethylene sorbitan fatty acids (for example, polyoxyethylene sorbitan monostearate, polyoxyethylene sorbitan monooleate, polyoxyethylene sorbitan tristearate and polyoxyethylene sorbitan trioleate), and mixtures thereof. The nonionic surfactant used in the herein described composition may be a single type alone, or two or more may be used in combination. Polyglycerol fatty acid esters are preferred among these for more excellent emulsified stability. Examples of available niosomes comprising polyglycerol fatty acid esters include NIKKOL NIKKOSOME™ PV-PF containing polyglyceryl- 10 laurate and polyglyceryl- 10 diisostearate.

[0024] In a particular embodiment, component (b) also contains, in addition to a nonionic surfactant, a polyol (for example, glycerol, ethylene glycol, 1,3 -propanediol, propylene glycol, butylene glycol, pentylene glycol, hexylene glycol, dipropylene glycol, polyethylene glycol, glycerol, diglycerol or polyglycerol), a higher fatty acid (for example, lauric acid, myristic acid, palmitic acid, stearic acid,isostearic acid or oleic acid) or its salt, citric acid or its salt, or water, or mixture thereof.

[0025] In a particular embodiment, the content of component (b) ranges from 0.1 to 5 mass%, preferably from 0.3 to 4.5 mass%, and more preferably from 0.5 to 4 mass%, based on the total mass of the oil-in-water emulsion. Indeed, the Applicant surprisingly found that if the content of component (b) is within this range, it provides a less sticky feel, a much better moisturizing effect and superior emulsion stability.Component (c)

[0026] The oil-in-water emulsion of the invention comprises (c) a thickener different from component (a). The thickener is a component that can impart a thickening effect to a composition, and it may be a (meth)acrylic polymer, a polysaccharide other than those contained in component (a), or mixtures thereof, for example.

[0027] The term "(meth)acrylic polymer", as used herein, means a polymer including (meth)acrylic acid and / or its derivative such as (meth)acrylic acid, a (meth)acrylic acid ester or (meth)acrylamide, as a structural unit. Specific examples of polymers with a (meth)acrylic group as a structural unit include sodium polyacrylate, sodium polyacrylate starch, carboxyvinyl polymers (carbomers), and mixtures thereof. Specific examples of polymers with (meth)acrylic acid esters as structural units include acrylic acid / alkyl methacrylate copolymer, (acrylates / C 10-30 alkyl acrylate cross polymer, (acrylates / ethylhexyl acrylate) copolymer, (acrylates / steareth-20 methacrylate) copolymer, (acrylates / beheneth-25 methacrylate) copolymer, and mixtures thereof.Specific examples of polymers with (meth)acryloylalkyltaurines or their salts as structural units include (acryloyldimethyltaurine ammonium / beheneth-25 methacrylate) crosspolymer, (hydroxyethyl acrylate / acryloyldimethyltaurine sodium) copolymer, (acryloyldimethyltaurine ammonium / VP) copolymer, (acryloyldimethyltaurine ammonium / carboxyethylammonium acrylate) crosspolymer, (acrylamide / acryloyldimethyltaurine sodium) copolymer, (dimethylacrylamide / acryloyldimethyltaurine sodium), crosspolymer (sodium acrylate / acryloyldimethyltaurine / dimethylacrylamide) crosspolymer, (acryloyldimethyltaurine sodium / VP) crosspolymer, polyacryloyldimethyltaurine ammonium, (sodium acrylate / acryloyldimethyltaurine sodium) copolymer, polyacryloyldimethyltaurine sodium, and mixtures thereof. As used herein, "VP" refers to vinylpyrrolidone.

[0028] Examples of polysaccharides other than those contained in component (a) include xanthan gum, gellan gum, sclerotium gum, gum arabic, guar gum, locust bean gum, tara gum, Tremella fuciformis polysaccharides, hyaluronic acid or its salts, chondroitin sulfuric acid or its salts, pectin, carrageenan, agar, alginic acid or its salts, starch, dextrin, methyl cellulose, ethyl cellulose, hydroxyethyl cellulose, and mixtures thereof.

[0029] Component (c) may be a single compound used alone, or two or more may be used in combination. Among these compounds for component (c), carboxyvinyl polymers (carbomers), acrylic acid / alkyl methacrylate copolymers, (acrylates / C 10-30 alkyl acrylate) cross polymer, (acryloyldimethyltaurine ammonium / VP) copolymer, xanthangum, gum arabic, and combinations thereof, are preferred to allow better emulsion stability.

[0030] In a particular embodiment, the content of component (c) ranges from 0.1 to 3 mass%, preferably from 0.15 to 2.8 mass%, and more preferably from 0.2 to 2.5 mass%, based on the total mass of the oil-in-water emulsion. Indeed, the Applicant surprisingly found that if the content of component (c) is within this range, it provides a superior emulsion stability.Component (d)

[0031] The oil-in-water emulsion of the invention comprises (d) an oil agent. The oil agent may be in any form such as a liquid, paste or solid form. Examples of oil agents include vegetable oils (for example, avocado oil, linseed oil, argan oil, almond oil, apricot kernel oil, olive oil, kukui nut oil, grapeseed oil, rice bran oil, safflower oil, shea butter, soybean oil, camellia oil, evening primrose oil, tamanu seed oil, sunflower oil, castor oil, jojoba oil, macadamia nut oil, palm oil, meadowfoam oil or rosehip oil), hydrocarbon oils (for example, liquid paraffins, light liquid isoparaffins, dodecane, isododecane, tetradecane, isotetradecane, hexadecane, isohexadecane, squalane, vaseline, polyisobutylene or polybutene), waxes (for example, beeswax, lanolin, carnauba wax, candelilla wax or spermaceti wax), and mixtures thereof.

[0032] Component (d) may be a single one used alone, or two or more may be used in combination. Vegetable oils are preferred among these substances for component (d).

[0033] In a particular embodiment, the content of component (d) ranges from 0.01 to 3 mass%, preferably from 0.01 to 2.5 mass%, andmore preferably from 0.1 to 2.5 mass%, based on the total mass of the oil-in-water emulsion.Component (e)

[0034] The oil-in-water emulsion of the invention contains (e) an aqueous medium. The aqueous medium may consist of water alone, or it may also include a solvent that is soluble in water.

[0035] The water used may be distilled water, purified water, hot spring water, deep water, or plant-derived steam distilled water such as lavender water, rose water, orange flower water, and mixtures thereof.

[0036] Examples of solvents that are soluble in water include monools such as methanol, ethanol, propyl alcohol, isopropyl alcohol and phenoxyethanol; and polyhydric alcohols such as ethylene glycol, propanediols (1,2-propanediol, 1,3-propanediol), propylene glycol, butylene glycol, pentylene glycol (1,2-pentanediol), hexylene glycol, 1 ,2-hexanediol, dipropylene glycol, polyethylene glycol, glycerin, diglycerin, polyglycerin, sorbitol, xylitol, mannitol, caprylyl glycol, poly oxyalkylene methyl glucosides (methyl gluceth-10 and methyl gluceth-20), and mixtures thereof. The solvent that is soluble in water may be a single one used alone, or two or more may be used in combination. Preferred among the above are glycerin, butylene glycol, pentylene glycol, propanediol, and mixtures thereof.

[0037] In a particular embodiment, the content of component (e) ranges from 25 to 95 mass%, preferably from 25 to 90 mass%, and more preferably from 30 to 90 mass%, based on the total mass of the oil-in-water emulsion.Other components

[0038] The oil-in-water emulsion of the invention may further comprise an electrolyte. The term "electrolyte" as used herein refers to a component different from components (a) to component (e) described above, which ionizes in the composition to function as active agents, conservatives, antioxidants or pH regulators. Including an electrolyte in an oil-in-water emulsion will tend to promote breakdown of the emulsion, but the combination of components (a) to (c) will maintain the stability even with electrolytes.

[0039] Examples of electrolytes that function as active agents include amino acids (such as adenosine), vitamins (such as sodium tocopheryl phosphate), saccharides (such as gluconolactone), plant-derived ingredients different from component (a) (for example, Centella asiatica leaf extract, iris root extract, Malva sylvestris flower, leaf or stem extract, rose extract and Rosa damascena flower extract), and mixtures thereof. Examples of electrolytes that function as conservatives include sodium benzoate, potassium sorbate, chlorphenesin, hydroxyacetophenone, and mixtures thereof. Citric acid is an example of an electrolyte that functions as an antioxidant.Examples of pH regulators include malic acid, citric acid, lactic acid, phosphoric acid and their salts; sodium hydroxide, potassium hydroxide, arginine, and mixtures thereof. A single electrolyte may be used alone, or two or more may be used in combination.

[0040] In a particular embodiment, the content of electrolytes ranges from 0.01 to 6 mass%, preferably from 0.05 to 6 mass%, and more preferably from 0.05 to 5.5 mass%, based on the total mass of the oil- in-water emulsion.

[0041] The oil-in-water emulsion of the invention may also contain, in addition to these components, other pH regulators, chelating agents, antifading agents, stabilizers, powders, pigments and perfumes, added as appropriate in order to impart various effects.

[0042] The oil-in-water emulsion of the invention preferably contains no silicone (i.e., is silicone-free) from the viewpoint of minimizing its environmental effect. As used herein, "silicone" refers to a compound having a siloxane bond (Si-O-Si), with silicon and oxygen mutually bonded, as the basic skeleton. Examples of silicones include silicone oils such as dimethicone, trisiloxane, cyclopentasiloxane, cyclohexasiloxane, cyclomethicone, diphenyl dimethicone, phenyl trimethicone and diphenylsiloxyphenyl trimethicone; and modified silicone oils such as stearyl dimethicone, cetyl dimethicone, (stearoxymethicone / dimethicone) copolymer, amodimethicone, aminopropyl dimethicone, bisaminopropyl dimethicone and biscetearyl amodimethicone .

[0043] As an example, the oil-in-water emulsion of the invention is prepared by a process comprising at least the following steps:(1) Component (e) and other aqueous components are mixed to obtain mixture A.(2) Component (c) is added to mixture A and the resulting mixture is heated and stirred to uniformity (preferably at a temperature ranging from 70°C to 90°C), and then cooled to obtain mixture B.(3) Component (a), component (b), component (d) and, optionally electrolytes, and other oily components are added to mixture B and the resulting mixture is stirred to uniformity.

[0044] In a particular embodiment, the oil-in-water emulsion of the invention is used as a skin care cosmetic or makeup cosmetic, such as a lotion, milk, essence, makeup remover, makeup base, foundation or concealer, for example.

[0045] The oil-in-water emulsion of the embodiment may be applied as a cosmetic onto a keratinic material, and particularly onto the skin. In other words, the present invention also provides a cosmetic process for caring for and / or making-up keratinic materials, comprising the application onto keratinic materials, in particular onto the skin, of the oil-in-water emulsion defined herein.Examples

[0046] The invention will now be illustrated by examples, with the understanding that the invention is not meant to be limited to these examples.

[0047] Preparation of oil-in-water emulsions>The oil-in-water emulsions of Examples 1 to 20 (according to the invention) and Comparative Examples 1 to 7 were prepared using the cosmetic agents and / or ingredients listed in Tables 1 to 4. The numerical values in Tables 1 to 4 are all mass%, based on the total mass of the oil-in-water emulsion. First, each aqueous medium (phase A) listed in the tables was mixed to uniformity at room temperature. The thickener (phase B) was added to the resulting mixture, and after stirring to uniformity at a temperature ranging from 80°C to 85°C, the mixture was cooled to 40°C. To this mixture there were added the plant-derived ingredient (phase C), vesicles (phase D), vegetable oils(phase E) and electrolyte (phase F), and the mixture was stirred to uniformity at room temperature to obtain an oil-in-water emulsion.

[0048] <Organoleptic evaluation>The lack of stickiness and the moisturizing effect with application of each composition were evaluated based on the following scale, in a single use test on skin by an evaluation panel of 5 cosmetic experts. The evaluation results were recorded by totaling the number of points by the 5 panel members and assigning "A" for a total value of 12 points or greater, "B" for 8 to 11 points and "C" for 5 to 7 points. The results are shown in Tables 1 to 3.(Evaluation scale for lack of stickiness)A (3 points): Smooth with no stickinessB (2 points): Slight stickiness, somewhat lack of smoothness C (1 point): Stickiness and lack of smoothness (Evaluation of moisturizing effect)A (3 points): Excellent moisturizing effectB (2 points): Slightly inferior moisturizing effectC (1 point): Inferior moisturizing effect

[0049] As shown in Tables 1 to 3, the compositions of the Examples 1 to 20 according to the invention, were all smooth without stickiness, and had excellent moisturizing effects. The compositions of Comparative Examples 1 to 6, on the other hand, were sticky and lacked smoothness, or had inferior moisturizing effects, while the composition of Comparative Example 7 was unable to maintain the stable emulsified state described below (see Table 4).

[0050] <Emulsion stability evaluation>Each composition was filled into a transparent glass container and sealed. It was then placed in a thermostatic bath at 50°C and allowed to stand for 1 month. After standing, the emulsion stability was visually evaluated based on the following scale. The results are shown in Tables 1 to 4.A: No changeB: Slight separationC: Complete separation

[0051] As shown in Tables 1 to 3, the compositions of the Examples 1 to 20, i.e., according to the invention, all maintained a stable emulsified state without separation of the aqueous phase and oil phase, even after standing for 1 month at 50°C. The compositions of the Comparative Examples, on the other hand, exhibited separation of the aqueous phase and oil phase and were thus unable to maintain a stable emulsified state (see Table 4).

[0052] [Table 1]

[0053] [Table 2]

[0054] [Table 3]

[0055] [Table 4]

Claims

CLAIMS1. An oil-in-water emulsion comprising:(a) at least one plant-derived ingredient selected from the group consisting of Hibiscus abelmoschus Extract, Pholiota Microspora Polysaccharides, and Pyrus Cydonia Seed Extract,(b) niosomes comprising at least one nonionic surfactant,(c) a thickener different from component (a),(d) an oil agent, and(e) an aqueous medium.

2. The oil-in-water emulsion according to claim 1, wherein the nonionic surfactant in component (b) is a polyglycerol fatty acid ester.

3. The oil-in-water emulsion according to claim 1 or 2, wherein component (c) includes at least one compound selected from the group consisting of (meth)acrylic polymers, and polysaccharides different from those contained in component (a).

4. The oil-in-water emulsion according to any one of claims 1 to 3, wherein component (d) includes a vegetable oil.

5. The oil-in-water emulsion according to any one of claims 1 to 4, which further comprises an electrolyte.

6. The oil-in-water emulsion according to any one of claims 1 to 5, which is silicone-free.

7. The oil-in-water emulsion according to any one of claims 1 to 6, wherein the content of component (a) ranges from 0.5 to 30 mass%, preferably from 0.8 to 28 mass%, and more preferably from 1 to 25 mass%, based on the total mass of the oil-in-water emulsion.

8. The oil-in-water emulsion according to any one of claims 1 to 7, wherein the content of component (b) ranges from 0.1 to 5 mass%, preferably from 0.3 to 4.5 mass%, and more preferably from 0.5 to 4 mass%, based on the total mass of the oil-in-water emulsion.

9. The oil-in-water emulsion according to any one of claims 1 to 8, wherein the content of component (c) ranges from 0.1 to 3 mass%, preferably from 0.15 to 2.8 mass%, and more preferably from 0.2 to 2.5 mass%, based on the total mass of the oil-in-water emulsion.

10. The oil-in-water emulsion according to any one of claims 1 to 9, which is in the form of a lotion, milk, an essence, makeup remover, a makeup base, a foundation or a concealer.

11. A cosmetic process for caring for and / or making-up keratinic materials, comprising the application onto keratinic materials, in particular onto the skin, of the oil-in-water emulsion according to any one of claims 1 to 10.

Images