WO2023162101A1

WO2023162101A1 - Oil-in-water emulsion cosmetic

Info

Publication number: WO2023162101A1
Application number: PCT/JP2022/007688
Authority: WO
Inventors: 沙耶香光; みのり井口; 華子土肥; 勇介諏訪; ちひろ大西
Original assignee: 株式会社コスモビューティー; プレミアアンチエイジング株式会社
Priority date: 2022-02-24
Filing date: 2022-02-24
Publication date: 2023-08-31
Also published as: TW202333646A

Abstract

Provided is a translucent oil-in-water emulsion cosmetic that is in the form of a nanoemulsion having an average particle size of 100 nm or less and excellent emulsion stability. This oil-in-water emulsion cosmetic contains the following components: (A) water; (B) a polyhydric alcohol; (C) at least one nonionic activator with an HLB value of 12-17 selected from the group consisting of polyoxyethylene hardened castor oil and a polyoxyethylene sorbitan fatty acid ester, in a total amount of 0.3-1.0 mass%; (D) at least one nonionic activator selected from the group consisting of sorbitan sesquioleate, sorbitan monooleate and sorbitan monoisostearate, in a total amount of 0.1-0.5 mass%; (E) 0.001-0.5 mass% of an ester oil having a viscosity of 25-35 mPa·s at 25°C; (F) a mixture of two or more materials selected from the group consisting of a legume plant extract, an ammiaceous plant extract, a labiatae plant extract, a polygonaceous plant extract, a theaceous plant extract, a composite plant extract, an araliaceous plant extract, a betulaceous plant extract, a rubiaceous plant extract and hydrolyzed products thereof, with caproylglycine; and (G) a mixture of two or more essential oils selected from the group consisting of a rutaceous plant essential oil, a labiatae plant essential oil, a geraniaceous plant essential oil and a gramineous plant essential oil.

Description

Oil-in-water emulsified cosmetic

The present invention relates to an oil-in-water emulsified cosmetic. In particular, it relates to a translucent oil-in-water emulsified cosmetic having a nanoemulsion form.

Oil-in-water (O/W) emulsion technology is widely applied to cosmetics in the form of emulsions, creams, lotions, and the like. Oil-in-water (O/W) emulsions are generally produced by micro-emulsifying oil into an aqueous phase using surface science or mechanical techniques.
However, it is not easy to prepare an emulsion with excellent emulsification stability over time, and conventional efforts have been made to balance the two by devising the types and blending ratios of surfactants and oils. . In particular, a nanoemulsion in which emulsion particles have an average particle size of 100 nm or less is characterized by exhibiting a translucent appearance. Therefore, in order to stably maintain the appearance, high emulsion stability is required.

　Patent Document 1 can be cited as a prior art document that discloses a technology related to the emulsification stability of a cosmetic composition in the form of a nanoemulsion. It is disclosed that when certain nonionic surfactants are used in the preparation of nanoemulsions, there is a problem that the stability of the nanoemulsions is impaired and the translucent appearance cannot be maintained. , as a method for solving this, it is described that in addition to oil and water, a combination of polyglycerin fatty acid ester and hydrotrope is used as components.

JP 2014-122195 A Japanese Patent Publication No. 57-29213

An object of the present invention is to provide an oil-in-water emulsified cosmetic in the form of a nanoemulsion that has excellent emulsion stability and stably maintains a translucent appearance. More specifically, the object is to provide an oil-in-water emulsified cosmetic which is excellent in emulsion stability while containing a plant extract.

As a result of repeated studies to solve the above problems, the present inventors found that a nanoemulsion formed using an ester oil, water, a polyhydric alcohol, and a nonionic surfactant, as an additional component We have found that the stability of nanoemulsions is impaired when certain plant extracts are added. Therefore, as a result of intensive studies to solve this problem, the stability of the nanoemulsion is improved by blending a certain kind of plant essential oil in addition to the plant extract, and the translucent appearance can be stably maintained. It was found that an oil-in-water emulsified cosmetic having

The present invention has been completed through further studies based on such knowledge, and has the following embodiments.

Section 1. Water containing the following (A), (B), (C), (D), (E), (F), and (G), and having an average particle size of emulsified particles of 100 nm or less Oil-type emulsified cosmetic:
(A) water (B) polyhydric alcohol (C) at least one selected from the group consisting of polyoxyethylene hydrogenated castor oil and polyoxyethylene sorbitan fatty acid ester nonionic activity having an HLB value of 12 to 17 agent in a total amount of 0.3 to 1.0% by mass,
(D) at least one nonionic active agent selected from the group consisting of sorbitan sesquioleate, sorbitan monooleate, and sorbitan monoisostearate, in a total amount of 0.1 to 0.5% by mass;
(E) 0.001 to 0.5% by mass of an ester oil having a viscosity of 25 to 35 mPa s at 25°C,
(F) Leguminous plant extract, Umbelliferous plant extract, Labiatae plant extract, Polygonaceous plant extract, Camellia family plant extract, Asteraceous plant extract, Araliaceous plant extract, Betulaceous plant extract, and Rubiaceous plant extract, and A mixture of two or more selected from the group consisting of these hydrolysates and caproylglycine,
(G) A mixture of two or more essential oils selected from the group consisting of Rutaceae plant essential oils, Labiatae plant essential oils, Geranium plant essential oils, and Gramineae plant essential oils.

Section 2. The above (F) is soybean seed extract, hydrolyzed soybean extract, Centella asiatica extract, Scutellaria root root extract, Japanese knotweed root extract, licorice root extract, tea leaf extract, rosemary leaf extract, chamomile flower extract, panax ginseng root extract, white birch extract, acen Item 2. The oil-in-water emulsified cosmetic according to Item 1, which is a mixture of yak extract and capryloylglycine.

Item 3. 3. Item 1 or 2, wherein the (G) is an essential oil mixture consisting of orange peel oil, bergamot fruit oil, lavender oil, odorant mulberry oil, amyris balsamifera bark oil, and palmarosa oil. Oil-in-water emulsified cosmetic.

The oil-in-water emulsified cosmetic of the present invention is characterized in that the emulsion particles have an average particle size of 100 nm or less and have a translucent appearance. According to the present invention, by having high emulsion stability, it is possible to stably exhibit a translucent appearance.

The oil-in-water emulsified cosmetic of the present invention is characterized by containing the following components and having an average particle size of emulsified particles of 100 nm or less:
(A) water;
(B) a polyhydric alcohol,
(C) at least one nonionic surfactant having an HLB value of 12 to 17 selected from the group consisting of polyoxyethylene hydrogenated castor oil derivatives and polyoxyethylene sorbitan fatty acid esters;
(D) at least one nonionic active agent selected from the group consisting of sorbitan sesquioleate, sorbitan monooleate, and sorbitan monoisostearate;
(E) an ester oil having a viscosity of 25 to 35 mPa s at 25°C;
(F) Leguminous plant extract, Umbelliferous plant extract, Labiatae plant extract, Polygonaceous plant extract, Camellia family plant extract, Asteraceous plant extract, Araliaceous plant extract, Betulaceous plant extract, and Rubiaceous plant extract, and A mixture of two or more selected from the group consisting of these hydrolysates and caproylglycine,
(G) A mixture of two or more essential oils selected from the group consisting of Rutaceae plant essential oils, Labiatae plant essential oils, Geranium plant essential oils, and Gramineae plant essential oils.

These components are described below.
(A) Water Water is not particularly limited as long as it is water that is usually used as a cosmetic material. For example, purified water, ion-exchanged water, distilled water, tap water, hydrogen water, alkaline electrolyzed water, etc. can be exemplified without limitation. The mixing ratio of water in the oil-in-water emulsified cosmetic of the present invention is not limited as long as the total amount including the components described later is 100% by mass (the balance of other components), but is 70 to 90% by mass. % range can be exemplified.

(B) Polyhydric alcohol Polyhydric alcohols include dihydric alcohols (e.g., dipropylene glycol, 1,3-butylene glycol, ethylene glycol, trimethylene glycol, 1,2-butylene glycol, tetramethylene glycol, 2,3 -butylene glycol, pentamethylene glycol, 2-butene-1,4-diol, hexylene glycol, octylene glycol, etc.), trihydric alcohols (e.g., glycerin, trimethylolpropane, etc.), tetrahydric alcohols (e.g., diglycerin) , pentaerythritol such as 1,2,6-hexanetriol, etc.), pentahydric alcohols (e.g., xylitol, triglycerin, etc.), hexahydric alcohols (e.g., sorbitol, mannitol, etc.), polyhydric alcohol polymers (e.g., diethylene glycol , dipropylene glycol-triethylene glycol, polypropylene glycol, tetraethylene glycol, diglycerin-triglycerin, tetraglycerin, polyglycerin, etc.), dihydric alcohol alkyl ethers (e.g., ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, ethylene glycol monophenyl ether, ethylene glycol monohexyl ether, ethylene glycol mono-2-methylhexyl ether, ethylene glycol isoamyl ether, ethylene glycol benzyl ether, ethylene glycol isopropyl ether, ethylene glycol dimethyl ether, ethylene glycol diethyl ether, ethylene glycol dibutyl ether, etc.), dihydric alcohol alkyl ethers (e.g., diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, diethylene glycol dimethyl ether, diethylene glycol diethyl ether, diethylene glycol butyl ether, diethylene glycol methyl ethyl ether, triethylene glycol monomethyl ether, triethylene glycol monoethyl ether, propylene glycol monomethyl ether, propylene glycol monoethyl ether, propylene glycol monobutyl ether, propylene glycol isopropyl ether, dipropylene glycol methyl ether, dipropylene glycol ethyl ether, dipropylene glycol butyl ether, etc.), dihydric alcohol ether ester (For example, ethylene glycol monomethyl ether acetate, ethylene glycol monoethyl ether acetate, ethylene glycol monobutyl ether acetate, ethylene glycol monophenyl ether acetate, ethylene glycol diazibate, ethylene glycol disuccinate, diethylene glycol monoethyl ether acetate, diethylene glycol monobutyl ether acetate, propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate, propylene glycol monopropyl ether acetate, propylene glycol monophenyl ether acetate, etc.), glycerin monoalkyl ethers (e.g., xyl alcohol, selachyl alcohol, batyl alcohol, etc.), Sugar alcohols (e.g., maltotriose, mannitol, sucrose, erythritol, glucose, fructose, amylolytic sugar, maltose, amylolytic sugar reducing alcohol, etc.), glycsolid, tetrahydrofurfuryl alcohol, POE -tetrahydrofurfuryl alcohol, POP-butyl ether, POP.POE-butyl ether tripolyoxypropylene glycerin ether, POP-glycerin ether, POP-glycerin ether phosphate, POP.POE-pentaneerythritol ether, polyglycerin and the like. Among these ingredients, without limitation, are glycerin, diglycerin, dipropylene glycol, propylene glycol, isoprene glycol, polyethylene glycol, pentylene glycol, polyglycerin, methylgluceth, 1,3-butylene glycol, 1,2-pentanediol. , 1,2-hexanediol, sorbitol, erythritol, maltitol and the like are ingredients that are preferably used in the production of cosmetics. Dihydric alcohols, trihydric alcohols and tetrahydric alcohols are preferred, and dipropylene glycol, 1,3-butylene glycol and glycerin are more preferred. These may be used individually by 1 type, or may be used in combination of 2 or more type.

The blending ratio of the polyhydric alcohol in the oil-in-water emulsified cosmetic of the present invention is not particularly limited as long as it does not impair the effects of the present invention, but the range of 5 to 30% by mass is exemplified. be able to. It is preferably 8 to 25% by mass, more preferably 10 to 20% by mass.

(C) Nonionic surfactant having an HLB value of 12 to 17 Examples of the nonionic surfactant include polyoxyethylene hydrogenated castor oil and polyoxyethylene sorbitan fatty acid ester. These can be used singly or in combination of two or more.

When one type of nonionic surfactant is used, polyoxyethylene hydrogenated castor oil or polyoxyethylene sorbitan fatty acid ester having its own HLB (hydrophilic-lipophilic balance) value in the range of 12 to 17 is used. be. The HLB value is preferably 12-16.
When two or more different polyoxyethylene hydrogenated castor oils are used in combination, when two or more different polyoxyethylene sorbitan fatty acid esters are used in combination, and polyoxyethylene hydrogenated castor oil and polyoxyethylene sorbitan fatty acid ester When used in combination, the HLB value of each component should be in the range of 12 to 17 for the mass average of all HLB values after combining each component. can be done.

As the polyoxyethylene hydrogenated castor oil, polyoxyethylene (hereinafter referred to as "POE") hydrogenated castor oil having an average added mole number of ethylene oxide (EO) groups in the range of 40 to 100 can be mentioned. POE (40) hydrogenated castor oil (HLB12.5, NIKKOL HCO-40), POE (50) hydrogenated castor oil (HLB13.5, NIKKOL HCO-50), POE (60) hydrogenated castor oil (HLB14 0, NIKKOL HCO-60), POE (80) hydrogenated castor oil (HLB15.0, NIKKOL HCO-80), POE (100) hydrogenated castor oil (HLB16.5, NIKKOL HCO-100), etc. manufactured by Nikko Chemicals Co., Ltd.). Among these, those having an average added mole number of EO groups of 40 to 100 are preferred, and POE (60) hydrogenated castor oil is more preferred.

As for polyoxyethylene sorbitan fatty acid esters, those having an HLB value in the range of 12 to 17 may be used, as described above. Preferably the HLB value is between 12 and 16, more preferably between 12.5 and 14.5. Examples of such polyoxyethylene sorbitan fatty acid esters include, but are not limited to, polyoxyethylene sorbitan monooleate (20E.O.) (also known as polysorbate 80), polyoxyethylene sorbitan monoisostearate (20E.O.), Polyoxyethylene sorbitan monopalmitate (20 E.O.), Polyoxyethylene sorbitan monostearate (20 E.O.), Polyoxyethylene sorbitan tristearate (20 E.O.), Polyoxyethylene sorbitan triisostearate ( 20E.O.), etc.

The blending ratio of the nonionic surfactant in the oil-in-water emulsified cosmetic of the present invention can be 0.3 to 1.0% by mass. It is preferably 0.4 to 0.9% by mass, more preferably 0.5 to 0.85% by mass.

(D) Nonionic surfactant consisting of sorbitan fatty acid ester Examples of the ionic surfactant include at least one selected from the group consisting of sorbitan sesquioleate, sorbitan monooleate, and sorbitan monoisostearate. be able to. These may be used singly or in any combination of two or more.

The blending ratio of the nonionic surfactant in the oil-in-water emulsified cosmetic of the present invention can be 0.1 to 0.5% by mass. It is preferably 0.15 to 0.45% by mass, more preferably 0.2 to 0.4% by mass.

(E) Ester oil Examples of the ester oil include those having a viscosity of 25 to 35 mPa·s at 25°C (product temperature). Here, the viscosity was measured using an ester oil adjusted to 25°C under the same temperature conditions using a versatile high-precision rotary digital viscometer (TQC Viscothinner: manufactured by Therminport Quality Control) (rotor number: spindle 1). can be evaluated by measuring the dynamic viscosity when rotated at 562 rpm for 1 minute.
Such ester oils include triethylhexanoin, octyldodecyl myristate, isocetyl stearate, hexyldecyl isostearate, and isocetyl myristate. These may be used singly or in any combination of two or more. Preferred are triethylhexanoin, octyldodecyl myristate and isocetyl stearate, and more preferred is triethylhexanoin.

The blending ratio of the ester oil in the oil-in-water emulsified cosmetic of the present invention can be 0.01 to 0.5% by mass. It is preferably 0.03 to 0.45% by mass, more preferably 0.04 to 0.42% by mass.

(F) A mixture of plant extracts and caproylglycine Plant extracts include leguminous plant extracts, Apiaceae plant extracts, Labiatae plant extracts, Polygonaceous plant extracts, Theaceae plant extracts, Asteraceae plant extracts, and Araliaceae plant extracts. Mention may be made of plant extracts, birch family plant extracts, and rubiaceous plant extracts.

The leguminous plant may be any plant belonging to the family Leguminosae, preferably soybean, astragalus, clara, kudzu, and white clover. More preferred is soybean.
The Umbelliferae plant may be any plant belonging to the Umbelliferae family, and preferably includes Centella asiatica, carrot, fennel, parsley, and cnidium. Centella asiatica is more preferred.
The Labiatae plant may be any plant belonging to the Labiatae family, but preferably includes Scutellaria root, rosemary, dead nettle, perilla, larvae, and spearmint. Scutellaria root and rosemary are more preferred.
The Polygonaceae plant may be any plant belonging to the Polygonaceae family, but preferably includes Japanese knotweed, Agrimony, Ibukitoranoo, Polygonum, and Buckwheat. Japanese knotweed is more preferred.
The Theaceae plant may be any plant belonging to the Theaceae family, preferably including tea, camellia, sasanqua, and sakaki. Cha is more preferred.
The Asteraceae plant may be any plant belonging to the Asteraceae family, preferably chamomile, lettuce, dandelion, thistle, and okera. Chamomile is more preferred.
The Araliaceae plant may be any plant belonging to the Araliaceae family, and preferably includes Panax ginseng, Ivy, Aralia, and Eleuthero. Panax ginseng is more preferred.
The Betulaceae plant may be any plant belonging to the Betulaceae family, but preferably include white birch, alder, and juniper. Birch is more preferred.
The Rubiaceae plant may be any plant belonging to the Rubiaceae family, and preferably includes Acacia, Gardenia, Madder, Cinchona, and Coffea. More preferred is Asenyak.

The plant part from which the extract is extracted can be selected according to each plant from roots, stems, leaves, petioles, leaves, flowers, seeds, fruits, pericarp, branches, bark, and whole plants. Examples include, but are not limited to, seeds of the leguminous plant soybean; leaves and stems of the Umbelliferae plant of Centella asiatica; roots and rhizomes of the Labiatae plant, Scutellaria root; leaves and petioles of the Labiatae plant, rosemary; Japanese knotweed, a plant belonging to the family Theaceae, has leaves and petioles; Chamomile, a plant belonging to the family Compositae, has flowers; Panax ginseng, a plant belonging to the family Araliaceae, has roots and rhizomes; An extract can be prepared from the leaves, petioles and branches of the family plant Acalyptus.

The solvent used for extract extraction includes polar solvents that are commonly used for plant extraction. Specifically water; alcohols such as methanol, ethanol, 1-propanol, 2-propanol, 1-butanol and 2-butanol; polyhydric alcohols such as 1,3-butylene glycol; ketones such as acetone; can be mentioned. These may be used individually by 1 type, and can also be used in arbitrary combinations of 2 or more types. Preferred are water, a polyhydric alcohol such as 1,3-butylene glycol, or a combination of water and a polyhydric alcohol such as 1,3-butylene glycol.

The extraction method using an extraction solvent can follow a conventional method and is not particularly limited, but for example, a method of immersing the target plant part in the solvent and allowing it to stand or stir can be mentioned. The temperature of the extraction solvent used (that is, the extraction temperature) can be appropriately set within the range of 0 to 100° C. depending on the type of solvent. The liquid extract thus prepared can be used as a plant extract in a liquid state as it is, but can also be used as a plant extract in a more concentrated state (concentrated liquid). Preferably, a plant extract (liquid) adjusted to have a solid content in the range of 0.01 to 5% by mass can be used.

The plant extract may be further hydrolyzed. A hydrolyzed extract can be prepared, for example, by adding an acid (eg, phosphoric acid, hydrochloric acid, nitric acid or acetic acid, preferably hydrochloric acid) to the above-described plant extract, hydrolyzing the mixture, and then desalting.

These plant extracts and their hydrolysates (hereinafter collectively referred to as "plant extracts") are obtained by combining two or more arbitrarily selected from these groups with caproylglycine, ( F) Used as a component. The combination of plant extracts is preferably a combination of plant extracts or hydrolyzed extracts belonging to different families among the nine families mentioned above. Preferably 3 or more, more preferably 4 or more, still more preferably 5 or more, even more preferably 6 or more, still more preferably 7 or more, especially preferably 8 or more, particularly preferably 9 or more, especially Leguminous plant extracts, Umbelliferous plant extracts, Labiatae plant extracts, Polygonaceous plant extracts, Camellia family plant extracts, Asteraceous plant extracts, Araliaceous plant extracts, Betulaceous plant extracts, and madder It is a combination of 10 or more, preferably 11 or more, more preferably 12, plant extracts, including the family plant extracts.
More specifically, among the plant extracts listed in Table 1 below, those containing Centella asiatica extract; preferably those containing Centella asiatica extract, Scutellaria root root extract, and Japanese knotweed root extract; Centella asiatica extract, Scutellaria root root extract, Japanese knotweed root extract, licorice root extract, and tea leaf extract; more preferably Centella asiatica extract, Scutellaria root extract, Japanese knotweed root extract, licorice root extract, tea leaf extract, and rosemary It contains leaf extract and chamomile flower extract.

In the component (F), the blending ratio of the plant extracts and caproylglycine consisting of a combination of two or more of the above is not limited, but the ratio of caproylglycine to 100 parts by mass of the total amount of the plant extracts is 0.1 to 0.1. A range of 10 parts by weight can be mentioned. It is preferably 0.3 to 5 parts by mass, more preferably 0.1 to 3 parts by mass.

The blending ratio of component (F) in the oil-in-water emulsified cosmetic of the present invention can be 0.001 to 2% by mass. It is preferably 0.01 to 1% by mass, more preferably 0.05 to 0.5% by mass.

(G) Plant essential oils Examples of plant essential oils include Rutaceae plant essential oils, Labiatae plant essential oils, Geranium plant essential oils, and Gramineae plant essential oils.

The Rutaceae plant may be any plant belonging to the Rutaceae family and containing an essential oil component, but preferably includes orange, bergamot, amylispersamifera, yuzu, lemon, Shikuwasa, and grapefruit. More preferred are orange, bergamot, and amilis persamifera.
The Labiatae plant may be any plant belonging to the Labiatae family and containing essential oil components, but preferably includes lavender, spearmint, perilla, sage, melissa, marjoram, and rosemary. Lavender is more preferred.
The Geranium plant may be any plant belonging to the Geranium family and containing an essential oil component, and preferably includes pelargonium and geranium. More preferred is Pelargonium odoratum.
The gramineous plant may be any plant belonging to the gramineous family and containing an essential oil component, but preferred examples include palmarosa, citronella, petiver, and lemongrass. Palmarosa is more preferred.

The plant part from which the essential oil is collected may be any part of the plant as long as it contains the essential oil, including roots, stems, leaves, petioles, leaves, flower parts, seeds, pericarp, fruits, branches, bark, and whole plants. , can be selected according to each plant. Although not limited, for example, the fruit of the Rutaceae plant orange is the peel, the bergamot is the fruit, the Amyrispersamifera is the bark; the Labiatae plant lavender is the flower part, leaves and stems; , Leaves; The leaves of the gramineous plant Palmarosa can be used to prepare essential oils.

The essential oil collection method can follow the standard method. Although not particularly limited, for example, known methods such as steam distillation method, compression method, solvent extraction method, enfleurage method (cold immersion method), maceration method (digestion method), and supercritical extraction method can be mentioned. .

The plant essential oil is used for the (G) component as a mixed essential oil by combining two or more arbitrarily selected from the group of plant essential oils described above. As for the combination of plant essential oils, it is preferable to combine essential oils of plants belonging to different families among the above-mentioned four families. Preferably 3 or more, more preferably 4 or more, particularly preferably 5 or more, preferably 6, including Rutaceae plant essential oil, Labiatae plant essential oil, Geranium plant essential oil, and Gramineae plant essential oil It is a mixture of plant essential oils.

The blending ratio of component (G) in the oil-in-water emulsified cosmetic of the present invention can be 0.01 to 0.5% by mass. It is preferably 0.03 to 0.3% by mass, more preferably 0.05 to 0.2% by mass.

(H) Other components The oil-in-water emulsified cosmetic of the present invention may contain other components blended in the emulsified cosmetic as long as the effect of the present invention (emulsification stability of the nanoemulsion) is not impaired. good. These other ingredients include, but are not limited to, water-soluble polymers, thickeners, UV absorbers, UV blockers, moisturizers, whitening agents, antioxidants, vitamins or provitamins, preservatives, pH They include modifiers, cooling agents, pigments, perfumes, and the like, and can be appropriately selected according to the type, shape, and use of the oil-in-water emulsified cosmetic.
The pH of the oil-in-water emulsified cosmetic of the present invention may be in the range of pH 5 to 7 because it is applied to the skin, but in terms of emulsion stability, the pH is in the range of 5.5 to 6.5. is preferably adjusted to

[Manufacturing method and characteristics]
The oil-in-water emulsified cosmetic of the present invention can be produced by mixing the components (A) to (G) and, if necessary, the component (H) according to a conventionally known method. Conventional methods include, for example, a non-aqueous emulsification method (see Patent Document 2), a D phase emulsification method (see Non-Patent Document 1), and a surface chemical emulsification method such as a phase inversion temperature emulsification method (see Non-Patent Document 2). According to the above, various commonly used emulsifiers such as paddle mixers, homomixers, homodispers, high-pressure homogenizers, colloid mills, pebble mills, and ultrasonic emulsifiers can be used. Preferred is an emulsification method using a non-aqueous emulsification method. Preferably, the components (B), (C), (D), and (E) are mixed to prepare a conch emulsion, and then the component (A) is added while dispersing using a paddle mixer. Furthermore, by blending preservatives, pH adjusters, thickeners, etc. as components (F) and (G), and components (H), the oil-in-water emulsified cosmetic of the present invention can be prepared. can.

The thus-prepared oil-in-water emulsified cosmetic of the present invention has a nanoemulsion form in which the average particle size of emulsified particles is 100 nm or less. In the absence of a specific opacifying agent, the translucency of the oil-in-water emulsified cosmetic of the present invention, which has a nanoemulsion form, originates from small emulsified particles (dispersed phase) with an average particle size of 100 nm or less. Such small-sized emulsified particles can be obtained by applying mechanical energy by using an emulsifier in the surface chemical emulsification method described above.

The oil-in-water emulsified cosmetic of the present invention is measured using a laser diffraction particle size distribution measuring device, particularly a nanoparticle size distribution measuring device (for example, a nanoparticle size distribution measuring device SALD-7500nano manufactured by Shimadzu Corporation). The number average diameter of the emulsified particles (referred to as "average particle size" in the present invention) is 100 nm or less. It is preferably 95 nm or less, more preferably 90 nm or less. The lower limit of the average particle size of the emulsified particles is not limited, but may be 40 nm or more, preferably 45 nm or more, more preferably 50 nm or more.

The oil-in-water emulsified cosmetic of the present invention is characterized by having such an oil-in-water nanoemulsion form and exhibiting a translucent appearance. The transparency of the nanoemulsion can be evaluated visually. Details can be evaluated according to the method described in the Examples section below.

[Application]
The oil-in-water emulsified cosmetic of the present invention can be applied to the human skin, face including lips, mucous membranes, nails, eyelashes, eyebrows, hair and/or scalp. By doing so, the oil-in-water emulsified cosmetic of the present invention can be used for non-therapeutic methods such as cosmetic methods for caring for the skin, lips, mucous membranes, nails, eyelashes, eyebrows, hair, and/or scalp. can be done.

The oil-in-water emulsified cosmetic of the present invention can be used as a care product and/or makeup product for body skin, facial skin, mucous membranes, nails, eyelashes, eyebrows, hair and/or scalp. Care products include lotions, emulsions, creams, hair tonics, hair conditioners, sunscreens, and the like; make-up products include lotions for pre-makeup, touch-up mists, and the like.

As used herein, the terms "include" and "contain" include the meanings of "consisting of" and "consisting essentially of".

In the following, the present invention will be described using experimental examples in order to facilitate understanding of the configuration and effects of the present invention. However, the present invention is not limited by these experimental examples. Unless otherwise specified, the following experiments were performed at room temperature (25±5° C.) and atmospheric pressure conditions. Unless otherwise specified, "%" described below means "% by mass", and "part" means "parts by mass".

Among the components of the test samples (Examples and Comparative Examples) used in the experiments below, the following were used as (F) the plant extract and (G) the plant essential oil mixture.

Experimental Example 1 Preparation of oil-in-water emulsified cosmetic and evaluation of its physical properties An oil-in-water emulsified cosmetic having the formulation shown in Tables 3 and 4 was prepared, and the average particle size of the emulsified particles was measured immediately after preparation and after storage for 3 months. And the appearance was measured to evaluate the physical properties of the oil-in-water emulsified cosmetic.

(1) Method for preparing oil-in-water emulsified cosmetic composition First, among the components shown in Tables 3 and 4, components (B), (C), (D), and (E) were mixed to prepare a conch emulsion. . Next, while stirring this using a paddle mixer (Three One Motor BL600: manufactured by HEIDON), component (A) is added, then components (F) and (G), and component (H) (pH adjuster ) was added and blended. After all the ingredients were added, the mixture was stirred for about 5 minutes with the same paddle mixer to prepare oil-in-water emulsified cosmetics (Examples 1 to 8, Comparative Examples 1 to 8) as test samples. Also, as a control sample, an oil-in-water emulsified cosmetic (control example) not containing the components (F) and (G) was prepared in the same manner.

(2) Evaluation method of oil-in-water emulsified cosmetic composition For the oil-in-water emulsified cosmetic composition prepared above (Examples 1 to 8, Comparative Examples 1 to 8, Control Example), immediately after preparation and under each temperature condition (0 ° C. , room temperature, 45° C.) for 3 months, and then the average particle diameter and appearance (presence or absence of translucency) of the emulsified particles were measured by the following methods.

[Measurement of average particle size of emulsified particles]
Nanoparticle size distribution measuring device (SALD-7500nano: blue-violet semiconductor laser (wavelength: 405 nm), manufactured by Shimadzu Corporation) without diluting oil-in-water emulsified cosmetics (ISO 13320 and JIS Z 8825 standards for laser diffraction and scattering methods) -1), the number particle size distribution of the emulsified particles was measured, and the number average particle size was determined.

[Measurement of Appearance (Presence or Absence of Translucency)]
An undiluted oil-in-water emulsified cosmetic was placed in a colorless and transparent glass square bottle (2 cm×2 cm: 50 ml capacity) and placed in front of a black dial under light with an illumination intensity of 1000 LUX. As the letters on the black dial, we adopted the Randall ring of the eye test chart. From the other side, the Randall ring on the dial was visually observed through the glass square bottle. The observation position was set so that the outer diameter (outer diameter) of the Randall ring on the dial was 2.3 mm.

As a control sample, purified water was placed in a colorless and transparent glass bottle and visually observed in the same manner. Based on the results, it was judged to be transparent, translucent, or cloudy according to the following criteria from the visibility of the Randall's ring.
Clear: Randall's rings are clearly visible as in the control sample.
Translucent: It is not clearly visible, but you can see where the hole (gap) is. Cloudy: You cannot see where the hole (gap) is.

(3) Test results The results are shown in Tables 3 and 4 together.
In Tables 3 and 4, the results of appearance evaluation mean the following:
〇: Uniformly translucent △: Cloudy but uniform appearance ×: Cloudy and aggregation or separation occurs

As can be seen from the results of Control Example and Comparative Example 8 shown in Table 4, in addition to components (A) to (E), when the plant extract of (F) and capryloylglycine are blended, (A) to (E) ) component, the balance of the nanoemulsion (control example) was lost, and no nanoemulsion was obtained (comparative example 8). This result was the same even when the mixing ratio of components (A) to (F) was changed (Comparative Examples 1 and 7). In addition to the components (A) to (E), when (G) plant essential oil is blended instead of (F), although a nanoemulsion can be prepared, the emulsion stability is poor, and after storage for 3 months , a phenomenon of coalescence and agglomeration of emulsion particles was observed (Comparative Example 2). Furthermore, when blending the components (F) and (G), no nanoemulsion was obtained unless either one of the components (C) and (D) was used (Comparative Examples 3 to 6).
On the other hand, by blending the components (A) to (G) in predetermined amounts, a uniform translucent nanoemulsion was formed, and even after storage for 3 months under various temperature conditions, the nanoemulsion remained stable. was confirmed to be stably maintained (Examples 1 to 8).

Formulation Example 1 A lotion having the formulation shown in Table 5 was prepared according to the method described in Experimental Example 1. The prepared lotion exhibited a stable and uniform translucency both immediately after preparation and after storage for at least 3 months.

Formulation Example 2 Gel A uniform translucent gel having the formulation shown in Table 6 was prepared. After mixing components (B), (C), (D), and (E) to prepare a conch emulsion, a part of component (A) is added while dispersing using a paddle mixer, and further ( Components F) and (G), and components (H) excluding carboxyvinyl polymer and sodium hydroxide are blended. An aqueous carboxyvinyl polymer solution neutralized with sodium hydroxide was added to this, and the mixture was stirred at 3000 rpm for 5 minutes with a homomixer to prepare a gel formulation. The prepared gel exhibited stable and uniform translucency both immediately after preparation and after storage for at least 3 months.

Claims

Water containing the following (A), (B), (C), (D), (E), (F), and (G), and having an average particle size of emulsified particles of 100 nm or less Oil-type emulsified cosmetic:
(A) water (B) polyhydric alcohol (C) at least one selected from the group consisting of polyoxyethylene hydrogenated castor oil and polyoxyethylene sorbitan fatty acid ester nonionic activity having an HLB value of 12 to 17 agent in a total amount of 0.3 to 1.0% by mass,
(D) at least one nonionic active agent selected from the group consisting of sorbitan sesquioleate, sorbitan monooleate, and sorbitan monoisostearate, in a total amount of 0.1 to 0.5% by mass;
(E) 0.001 to 0.5% by mass of an ester oil having a viscosity of 25 to 35 mPa s at 25°C,
(F) Leguminous plant extract, Umbelliferous plant extract, Labiatae plant extract, Polygonaceous plant extract, Camellia family plant extract, Asteraceous plant extract, Araliaceous plant extract, Betulaceous plant extract, and Rubiaceous plant extract, and A mixture of two or more selected from the group consisting of these hydrolysates and caproylglycine,
(G) A mixture of two or more essential oils selected from the group consisting of Rutaceae plant essential oils, Labiatae plant essential oils, Geranium plant essential oils, and Gramineae plant essential oils.
The above (F) is soybean seed extract, hydrolyzed soybean extract, Centella asiatica extract, Scutellaria root root extract, Japanese knotweed root extract, licorice root extract, tea leaf extract, rosemary leaf extract, chamomile flower extract, panax ginseng root extract, white birch extract, acen The oil-in-water emulsified cosmetic according to claim 1, which is a mixture of yak extract and capryloylglycine.
3. The method according to claim 1 or 2, characterized in that (G) is an essential oil mixture consisting of orange peel oil, bergamot fruit oil, lavender oil, marigold oil, amyris balsamifera bark oil, and palmarosa oil. oil-in-water emulsified cosmetic.