CN114867449A

CN114867449A - Oil-in-water type emulsified cosmetic

Info

Publication number: CN114867449A
Application number: CN202080087123.7A
Authority: CN
Inventors: 渡边司; 古川亮
Original assignee: Shiseido Co Ltd
Current assignee: Shiseido Co Ltd
Priority date: 2019-12-17
Filing date: 2020-12-10
Publication date: 2022-08-05
Also published as: JPWO2021125051A1; WO2021125051A1

Abstract

Provided is an oil-in-water emulsion cosmetic which has excellent emulsion stability and can exhibit a sense of disintegration as a sense of use. The oil-in-water type emulsion cosmetic of the present disclosure contains: a dispersion medium comprising water; and oil droplets dispersed in the dispersion medium, the oil droplets containing an oil component, a linear higher fatty acid having 16 or more carbon atoms, a monohydric higher alcohol, and a nonionic surfactant, the oil component containing at least one selected from a polar oil having an IOB of 0.10 or more and an ultraviolet absorber having an IOB of 0.10 or more, and the viscosity (V) measured at 0.6rpm when the B-type viscometer is used in an atmosphere at 30 ℃ (V) _0.6rpm ) With the viscosity (V) measured at 12rpm _12rpm ) Viscosity ratio (V) _0.6rpm /V _12rpm ) Is 7.9 or more.

Description

Oil-in-water type emulsified cosmetic

Technical Field

The present disclosure relates to an oil-in-water type emulsion cosmetic.

Background

In recent years, oil-in-water emulsion cosmetics have been developed which have emulsion stability and exhibit various feelings of use.

Patent document 1 discloses an emulsion composition which is obtained by blending (a) 0.01 to 5% by weight of a polysiloxane-polyoxyalkylene copolymer, (b) 0.05 to 1% by weight of a nonionic surfactant, (c) 10 to 30% by weight of a humectant, and (d) 1 to 50% by weight of urea, exhibits an excellent moisturizing effect while reducing irritation of urea, and has a very refreshing feeling in use.

Patent document 2 discloses an emulsion composition containing a poorly soluble drug, an oily component containing two or more higher alcohols, water, and a surfactant, wherein one of the higher alcohols is behenyl alcohol, which emulsion composition is excellent in usability and has excellent dispersion stability and emulsion stability of the drug.

Patent document 3 discloses an emulsion composition which is obtained by blending 0.01 to 5.0 mass% of a polysiloxane-polyoxyalkylene copolymer (a) and 0.05 to 1.0 mass% of a nonionic surfactant (B) or 0.05 to 5.0 mass% of a higher fatty acid having 12 or more carbon atoms with 0.05 to 50.0 mass% of a glycoside in which urea and/or ascorbic acid is blended, and which is excellent in stability and has a fresh feeling of use without stickiness.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open No. 2001-247427

Patent document 2: japanese unexamined patent publication No. 2001-354548

Patent document 3: japanese laid-open patent publication No. 2002-249665

Disclosure of Invention

Problems to be solved by the invention

An emulsified composition constituting a cosmetic contains an oil component. In oil, polar oil has oil properties and on the other hand has polarity, and therefore has properties of being easily compatible with water as compared with nonpolar oil. Therefore, the emulsion balance between the aqueous phase and the oil phase is liable to be lost, and it is difficult to improve the emulsion stability of the oil-in-water type emulsion cosmetic containing the polar oil. Moreover, it is more difficult to adjust the feeling of use of an oil-in-water type emulsion cosmetic containing such a polar oil.

Therefore, the subject of the present disclosure is to provide an oil-in-water type emulsion cosmetic which is excellent in emulsion stability and can exhibit a sense of disintegration as a sense of use.

Means for solving the problems

Scheme 1

An oil-in-water type emulsified cosmetic composition comprising:

a dispersion medium comprising water; and

oil droplets dispersed in the dispersion medium described above,

the oil droplets contain an oil component, a linear higher fatty acid having 16 or more carbon atoms, a monohydric higher alcohol, and a nonionic surfactant,

the oil component contains at least one kind selected from polar oil with IOB of 0.10 or more and ultraviolet absorbent with IOB of 0.10 or more,

viscosity (V) measured at 0.6rpm using a B-type viscometer at 30 ℃ in an atmosphere _0.6rpm ) With the viscosity (V) measured at 12rpm _12rpm ) Viscosity ratio (V) _0.6rpm /V _12rpm ) Is 7.9 or more.

Scheme 2

The cosmetic preparation according to claim 1, wherein the mass ratio of the linear higher fatty acid to the monohydric higher alcohol is 0.50 or more.

Scheme 3

The cosmetic preparation according to claim 1 or 2, wherein the linear higher fatty acid, the higher alcohol, and the nonionic surfactant form an interfacial film of the oil droplets in an atmosphere at 25 ℃.

Scheme 4

The cosmetic preparation according to any one of claims 1 to 3, wherein the linear higher fatty acid is at least one selected from stearic acid and behenic acid, and the higher alcohol is at least one selected from cetyl alcohol, isostearyl alcohol, stearyl alcohol and behenyl alcohol.

Scheme 5

The cosmetic according to any one of aspects 1 to 4, wherein the oil component contains at least one selected from the group consisting of a polar oil having an IOB of 0.10 or more and an ultraviolet absorber having an IOB of 0.10 or more in an amount of 50% by mass or more.

Scheme 6

The cosmetic material according to any one of aspects 1 to 5, further comprising a dihydric higher alcohol.

(plan 7)

The cosmetic according to any one of aspects 1 to 6, wherein the oil component further comprises a volatile acyclic silicone oil.

Scheme 8

The cosmetic according to any one of claims 1 to 7, further comprising at least one selected from a whitening agent and an anti-inflammatory agent.

Scheme 9

The cosmetic preparation according to any one of aspects 1 to 8, wherein the content of the thickener is 1% by mass or less.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the present disclosure, an oil-in-water emulsion cosmetic that is excellent in emulsion stability and can exhibit a sense of disintegration as a sense of use can be provided.

Detailed Description

Hereinafter, embodiments of the present disclosure will be described in detail. The present disclosure is not limited to the following embodiments, and various modifications may be made within the scope of the present invention.

The oil-in-water type emulsion cosmetic (sometimes simply referred to as "cosmetic") of the present disclosure contains: a dispersion medium comprising water; and oil droplets dispersed in the dispersion medium, the oil droplets containing an oil component, a linear higher fatty acid having 16 or more carbon atoms, a monohydric higher alcohol, and a nonionic surfactant, wherein the oil component in the oil droplets contains at least one selected from a polar oil having an IOB of 0.10 or more and an ultraviolet absorber, and in addition, the viscosity (V) measured at 0.6rpm when the type B viscometer is used in an atmosphere of 30 ℃, (V) is measured _0.6rpm ) With the viscosity (V) measured at 12rpm _12rpm ) Viscosity ratio (V) _0.6rpm /V _12rpm ) Is 7.9 or more.

Although not limited by the principle, the principle of action that such an oil-in-water type emulsion cosmetic is excellent in emulsion stability and can achieve a specific viscosity ratio in the sense of disintegration is considered as follows.

When a polar oil having an IOB of 0.10 or more or an ultraviolet absorber having an IOB of 0.10 or more, which can correspond to such a polar oil, is contained as an oil component, the emulsion balance is generally disturbed, and therefore, the emulsion stability of the cosmetic is expected to be lowered. Therefore, even though various documents disclose an oil-in-water type emulsion composition containing a nonpolar oil, a linear higher fatty acid having 16 or more carbon atoms, a monohydric higher alcohol, and a nonionic surfactant, those skilled in the art would not normally think of changing the nonpolar oil in such a composition to a polar oil.

The present inventors have found that even when a polar oil is used as the oil component, the emulsion particles (oil droplets) prepared using a specific material, that is, a linear higher fatty acid having 16 or more carbon atoms, a monohydric higher alcohol, and a nonionic surfactant have excellent emulsion stability.

The main reason for the expression of such emulsion stability is considered to be: for example, a linear higher fatty acid having 16 or more carbon atoms, a monohydric higher alcohol, and a nonionic surfactant form an interface film such as a gel film or a liquid crystal film based on lamellar liquid crystals or the like that are stronger than micelle structures or the like at normal temperature, for example, in an atmosphere of 25 ℃ or 30 ℃, around emulsified particles, and a polar oil that easily breaks the emulsion equilibrium is included.

Further, the presence of such an interfacial film is also considered to affect the feeling of disintegration in the cosmetic of the present disclosure. That is, unlike the emulsified particles having an interface film, for example, particles having a micelle structure, the interface film is broken at once when a load exceeding a limit value is applied, and thus a sense of disintegration is considered to be exhibited.

The terms in this disclosure are defined as follows.

In the present disclosure, the "disintegrating feeling" refers to a feeling of use in which the viscosity of a cosmetic is reduced at a glance when a load is applied to the cosmetic. Specifically, the "disintegrating feeling" in the present disclosure means a feeling of use in which the viscosity is high and the fluidity is low at the stage of placing the cosmetic on the skin or the like, but if the cosmetic is applied to the skin or the like by rubbing against each other, the viscosity is reduced and the state of dry and high fluidity is obtained. The disintegration feeling was measured by using a B-type viscometer (TVB-10, manufactured by Toyobo industries Co., Ltd., rotor No. L3) at 30 ℃ in an atmosphere of 0.6rpm (V) _0.6rpm ) With the viscosity (V) measured at 12rpm _12rpm ) Viscosity ratio (V) _0.6rpm /V _12rpm ) The term "viscosity ratio" means a state of 7.9 or more.

Oil-in-water type emulsified cosmetic preparation

The oil-in-water emulsion cosmetic of the present disclosure has excellent emulsion stability. The emulsion stability here means, for example, a state in which the particles are not separated at 0 to 37 ℃ for 4 weeks, preferably at 50 ℃ for 4 weeks, and preferably a state in which the emulsified particles (oil droplets) have little or no change in size.

In addition, the oil-in-water type emulsion cosmetic of the present disclosure may exhibit a sense of disintegration. Such a sense of disintegration can be determined by the viscosity ratio (V) as described above _0.6rpm /V _12rpm ) To specify. The viscosity ratio may be 7.9 or more, 8.0 or more, 8.1 or more, 8.3 or more, 8.5 or more, 8.7 or more, 9.0 or more, 9.5 or more, or 10.0 or more. The upper limit of the viscosity ratio is not particularly limited, and may be, for example, 30.0 or less, 25.0 or less, 20.0 or less, or 15.0 or less.

The viscosity ratio of the oil-in-water type emulsion cosmetic can be controlled by adjusting at least one of the following conditions (a) to (c):

(a) the mass ratio of the linear higher fatty acid to the monohydric higher alcohol.

(b) Oil components (e.g., polar oils and volatile acyclic silicone oils), linear higher fatty acids having 16 or more carbon atoms, monohydric higher alcohols, and nonionic surfactants, and combinations thereof.

(c) The proportion of the polar oil and/or the volatile acyclic silicone oil in the oil component.

Viscosity (V) measured at 12rpm as an oil-in-water type emulsion cosmetic of the present disclosure _12rpm ) The amount of the surfactant is not particularly limited, and may be appropriately determined in consideration of the application performance, the feeling of use, and the like of the cosmetic. For example, the viscosity (V) was measured using a B-type viscometer (TVB-10, manufactured by Toyobo industries Co., Ltd., rotor number L3) at 30 ℃ in an atmosphere _12rpm ) The viscosity of the aqueous dispersion may be 20,000 mPas or less, 18,000 mPas or less, 15,000 mPas or less, 12,000 mPas or less, 10,000 mPas or less, 8,000 mPas or less, 6,000 mPas or less, or 5,000 mPas or less, or may be 2,000 mPas or more, 2,200 mPas or more, 2,500 mPas or more, 2,700 mPas or more, or 3,000 mPas or more.

Dispersion medium

The oil-in-water type emulsified cosmetic of the present disclosure contains water as a dispersion medium.

(Water)

The amount of water to be blended is not particularly limited, and may be, for example, 50 mass% or more, 60 mass% or more, 70 mass% or more, or 80 mass% or more, or 95 mass% or less, 90 mass% or less, or 85 mass% or less with respect to the total amount of the cosmetic material, from the viewpoint of emulsion stability, disintegrating feeling, or the like.

The water that can be used in the oil-in-water emulsion cosmetic of the present disclosure is not particularly limited, and water that can be used in cosmetics, quasi drugs, and the like can be used. For example, ion-exchanged water, distilled water, ultrapure water, tap water, or the like can be used.

Oil drop

Oil droplets as an oil phase or a dispersed phase in the oil-in-water type emulsion cosmetic contain an oil component, a linear higher fatty acid having 16 or more carbon atoms, a monohydric higher alcohol, and a nonionic surfactant. Among these components, a linear higher fatty acid having 16 or more carbon atoms, a monohydric higher alcohol, and a nonionic surfactant can form an interfacial film of oil droplets. Such an interface film can be confirmed using, for example, an optical microscope.

The present inventors have found that oil droplets (emulsified particles) having such an interfacial film can be obtained, for example, by preparing an oil-in-water emulsion composition by a liquid crystal emulsion method in which a linear higher fatty acid having 16 or more carbon atoms, a monohydric higher alcohol, and a nonionic surfactant are mixed together with a highly polar oil component while heating to prepare a solution, and the solution is added to heated water.

The average particle size of the oil droplets as the dispersed phase is not particularly limited. The average particle size of the oil droplets may be, for example, 10 μm or less, 7 μm or less, 5 μm or less, or 3 μm or less immediately after the production. The lower limit of the average particle diameter is not particularly limited, and may be, for example, 500nm or more, 700nm or more, or 1 μm or more. Here, the average particle diameter of the oil droplets may be defined as an average value of the projected area equivalent circle diameters of 10 or more, preferably 100 or more oil droplets observed with an optical microscope.

(oil component)

The content of the oil component in the oil-in-water type emulsion cosmetic of the present disclosure is not particularly limited, and may be, for example, 0.5 mass% or more, 1 mass% or more, 3 mass% or more, 5 mass% or more, 7 mass% or more, 10 mass% or more, 13 mass% or more, or 15 mass% or more, or 50 mass% or less, 40 mass% or less, 30 mass% or less, 25 mass% or less, or 20 mass% or less, relative to the total amount of the cosmetic.

The oil component contains at least one selected from a polar oil having an IOB of 0.10 or more and an ultraviolet absorber having an IOB of 0.10 or more. The cosmetic composition of the present disclosure can improve the emulsion stability of oil droplets by a linear higher fatty acid having 16 or more carbon atoms, a monohydric higher alcohol, and a nonionic surfactant, and therefore can highly contain a polar oil having an IOB of 0.10 or more and an ultraviolet absorber. The oil component may be contained in an amount of 50 mass% or more, 60 mass% or more, 65 mass% or more, 70 mass% or more, or 75 mass% or more based on the whole oil component. The upper limit of the oil content is not particularly limited, and may be, for example, 100 mass% or less, 95 mass% or less, 90 mass% or less, 85 mass% or less, 80 mass% or less, or 75 mass% or less. Here, an organic ultraviolet absorber having an IOB of 0.10 or more can be regarded as an oil component.

The IOB value of the polar oil and the ultraviolet absorber may be, for example, 0.10 or more, 0.11 or more, 0.12 or more, or 0.13 or more, and may be 0.50 or less, 0.45 or less, or 0.40 or less. Here, the IOB value is a abbreviation of Inorganic/Organic Balance, and is a value indicating a ratio of an Inorganic value to an Organic value, and is an index showing a degree of polarity of an Organic compound. Specifically, the IOB value is expressed as an inorganic value/organic value. The "inorganic value" and the "organic value" are each set, for example, such that the "inorganic value" and the "organic value" corresponding to each atom or functional group are set as the "organic value" and the "hydroxyl group" corresponding to each atom or functional group in the molecule are 20 and 100, and the "inorganic value" and the "organic value" of all the atoms and functional groups in the organic compound are added up to calculate the IOB value of the organic compound (see, for example, athetimics, "regulatory concept figure-base 3099 と," (organic concept map-base and application-) ", p.11 to 17, published in three co-publications, published in 1984).

Polar oil having an IOB of 0.10 or more

Examples of polar oils satisfying such conditions include isopropyl myristate (IOB value ═ 0.18), octyl palmitate (IOB value ═ 0.13), isopropyl palmitate (IOB value ═ 0.16), butyl stearate (IOB value ═ 0.14), hexyl laurate (IOB value ═ 0.17), myristyl myristate (IOB value ═ 0.11), decyl oleate (IOB value ═ 0.11), isononyl isononanoate (IOB value ═ 0.20), isotridecyl isononanoate (IOB value ═ 0.15), cetyl ethylhexanoate (IOB value ═ 0.13), pentaerythritol tetraethylhexanoate (IOB value ═ 0.35), diethylhexyl succinate (IOB value ═ 0.32), dioctyl succinate (IOB value ═ 0.36), ethylene glycol distearate (IOB value ═ 0.0.25), diglycerol distearate (IOB value) (IOB value ═ 0.28), isodecyl malate (IOB value ═ 0.25), isodecyl stearate (IOB value) Trimethylolpropane triisostearate (IOB value ═ 0.16), glycerol tri-2-ethylhexanoate (triisooctanoate) (IOB value ═ 0.35), trimethylolpropane trioctanoate (IOB value ═ 0.33), trimethylolpropane triisostearate (IOB value ═ 0.16), diisobutyl adipate (IOB value ═ 0.46), N-lauroyl-L-glutamic acid-2-octyldodecyl ester (IOB value ═ 0.29), 2-hexyldecyl adipate (IOB value ═ 0.16), diisopropyl sebacate (IOB value ═ 0.40), 2-ethylhexyl palmitate (IOB value ═ 0.13), 2-ethylhexyl ethylhexanoate (IOB value ═ 0.2), glyceryl triisostearate (IOB value ═ 0.16), dipivalonic acid PPG-3(IOB value ═ 0.52), glyceryl tri (caprylic/capric) ester (IOB value ═ 0.33), and the like. These may be used alone or in combination of two or more.

An ultraviolet absorber having an IOB of 0.10 or more

Examples of the ultraviolet absorbers satisfying such conditions include organic ultraviolet absorbers such as ethylhexyl methoxycinnamate, octocrylene, polysiloxane-15, t-butyl methoxydibenzoylmethane, ethylhexyl triazone, bis-ethylhexyl oxyphenol methoxyphenyl triazine, diethylamino hydroxybenzoyl hexyl benzoate, benzophenone-3, methylene bis-benzotriazolyl tetramethylbutyl phenol, homosalate, and ethylhexyl salicylate. These ultraviolet absorbers may be used singly or in combination of two or more.

(C16 or more straight chain higher fatty acid)

The content of the linear higher fatty acid having 16 or more carbon atoms in the oil-in-water type emulsion cosmetic of the present disclosure is not particularly limited, and may be, for example, 0.10% by mass or more, 0.15% by mass or more, 0.20% by mass or more, 0.25% by mass or more, or 0.30% by mass or more, or 5.0% by mass or less, 3.0% by mass or less, or 1.0% by mass or less, relative to the total amount of the cosmetic.

The oil-in-water type emulsion cosmetic of the present disclosure may contain a higher fatty acid other than the linear higher fatty acid having 16 or more carbon atoms, for example, a linear or branched higher fatty acid having less than 16 carbon atoms or a branched higher fatty acid having 16 or more carbon atoms, within a range that does not affect the effects of the present invention, but from the viewpoint of disintegration feeling and emulsion stability, these other higher fatty acids are preferably contained in a range of, for example, less than 0.10 mass%, 0.05 mass% or less, or 0.01 mass% or less with respect to the total amount of the cosmetic, and further, these other higher fatty acids are more preferably not contained in the cosmetic.

The number of carbon atoms of the linear higher fatty acid may be 16 or more, or 18 or more, or 25 or less, 24 or less, or 22 or less.

Examples of such a linear higher fatty acid include saturated fatty acids such as palmitic acid, stearic acid, arachidic acid, behenic acid (n-docosanoic acid) and lignoceric acid, and unsaturated fatty acids such as palmitoleic acid, oleic acid, linoleic acid, α -linolenic acid, γ -linolenic acid, arachidonic acid, eicosapentaenoic acid and docosahexaenoic acid. Among them, from the viewpoint of the feeling of disintegration, saturated fatty acids are preferable, stearic acid and behenic acid are more preferable, and behenic acid is particularly preferable. These straight chain higher fatty acids may be used alone or in combination of two or more.

(monohydric higher alcohol)

The content of the monohydric higher alcohol in the oil-in-water type emulsion cosmetic of the present disclosure is not particularly limited, and may be, for example, 0.1 mass% or more, 0.3 mass% or more, 0.5 mass% or more, 0.7 mass% or more, or 1.0 mass% or more, or 5.0 mass% or less, 4.0 mass% or less, or 3.0 mass% or less, based on the total amount of the cosmetic.

The monohydric higher alcohol is not particularly limited, and for example, a saturated or unsaturated monohydric aliphatic alcohol may be used, and may be either linear or branched, but is preferably linear. From the viewpoint of emulsion stability and sense of disintegration, preferred is a monohydric higher alcohol which is solid at room temperature, for example, and which, together with a linear higher fatty acid and a nonionic surfactant, is likely to form an interface film such as a gel film or a liquid crystal film made of a lamellar liquid crystal or the like at room temperature or higher. Here, the term "normal temperature" in the present disclosure means a range of 5 ℃ to 35 ℃.

Examples of such monohydric higher alcohols include higher alcohols having a melting point of 40 ℃ or higher, for example, monohydric aliphatic alcohols having 10 to 30 carbon atoms. Specific examples thereof include stearyl alcohol, isostearyl alcohol, oleyl alcohol, octyldodecanol, cholesterol, sitosterol, cetyl alcohol (cetyl alcohol), cetostearyl alcohol, decyltetradecyl alcohol, phytosterol, hexyldecanol, behenyl alcohol, lauryl alcohol, lanolin alcohol, and hydrogenated lanolin alcohol. Among them, cetyl alcohol, isostearyl alcohol, stearyl alcohol, and behenyl alcohol are preferable, and behenyl alcohol is more preferable, from the viewpoint of emulsion stability and disintegration feeling. These higher alcohols may be used singly or in combination of two or more.

a. Mass ratio of higher alcohol to straight chain higher fatty acid

The mass ratio of the linear higher fatty acid having 16 or more carbon atoms to the monohydric higher alcohol is preferably 0.50 or more, 0.55 or more, 0.60 or more, or 0.65 or more, and preferably 2.0 or less, 1.7 or less, 1.5 or less, or 1.3 or less, from the viewpoints of emulsion stability, disintegrating feeling, and the like. In some embodiments, when the oil-in-water type emulsion cosmetic of the present disclosure contains a volatile acyclic silicone oil described later as an oil component, such a mass ratio may be 0.30 or more, 0.35 or more, 0.40 or more, 0.45 or more, 0.50 or more, 0.55 or more, 0.60 or more, or 0.65 or more, and may be 2.0 or less, 1.7 or less, 1.5 or less, or 1.3 or less.

(nonionic surfactant)

The content of the nonionic surfactant in the oil-in-water type emulsion cosmetic of the present disclosure is not particularly limited, and may be, for example, 0.1 mass% or more, 0.3 mass% or more, or 0.5 mass% or more, or 5.0 mass% or less, 4.0 mass% or less, 3.0 mass% or less, or 2.0 mass% or less with respect to the total amount of the cosmetic.

The nonionic surfactant is not particularly limited, and examples thereof include polyoxyalkylene alkyl ethers, polyalkylene glycol fatty acid esters, POE alkyl ethers, POE/POP alkyl ethers, PEG fatty acid esters, polyglycerol fatty acid esters, POE glycerol fatty acid esters, isostearic acid PEG glycerol esters, and silicone surfactants. These may be used alone or in combination of two or more.

Examples of the polyoxyalkylene alkyl ether include polyoxyethylene behenyl ether and polyoxyethylene stearyl ether.

Examples of the polyalkylene glycol fatty acid ester include polyethylene glycol monostearate and polyethylene glycol monooleate.

Examples of the POE alkyl ethers include, for example, POE (2) lauryl ether, POE (4.2) lauryl ether, POE (9) lauryl ether, POE (5.5) cetyl ether, POE (7) cetyl ether, POE (10) cetyl ether, POE (15) cetyl ether, POE (20) cetyl ether, POE (23) cetyl ether, POE (4) stearyl ether, POE (20) stearyl ether, POE (7) oleyl ether, POE (10) oleyl ether, POE (15) oleyl ether, POE (20) oleyl ether, POE (50) oleyl ether, POE (10) behenyl ether, POE (20) behenyl ether, POE (30) behenyl ether, POE (2) (C12-15) alkyl ether, POE (4) (C12-15) alkyl ether, POE (10) (C12-15) alkyl ether, POE (5) secondary alkyl ether, POE (7) secondary alkyl ether, POE (9) alkyl ether, POE (12) alkyl ether, and the like.

Examples of the POE/POP alkyl ether include POE (1) polyoxypropylene (POP) (4) cetyl ether, POE (10) POP (4) cetyl ether, POE (20) POP (8) cetyl ether, POE (20) POP (6) decyltetradecyl ether, and POE (30) POP (6) decyltetradecyl ether.

Examples of the PEG fatty acid ester include polyethylene glycol monolaurate (hereinafter, abbreviated as PEG) (10), PEG (10) monostearate, PEG (25) monostearate, PEG (40) monostearate, PEG (45) monostearate, PEG (55) monostearate, PEG (100) monostearate, PEG (10) monooleate, PEG distearate, PEG diisostearate, PEG (40) hydrogenated castor oil, PEG (50) hydrogenated castor oil, PEG (60) hydrogenated castor oil, PEG (100) hydrogenated castor oil, and the like.

Examples of the polyglycerin fatty acid esters include hexaglycerol monolaurate, hexaglycerol monomyristate, hexaglycerol monostearate, hexaglycerol monooleate, decaglycerol monolaurate, decaglycerol monomyristate, decaglycerol monostearate, decaglycerol monoisostearate, decaglycerol monooleate, decaglycerol distearate, and decaglycerol diisostearate.

Examples of POE glycerin fatty acid esters include Polyoxyethylene (POE) (5) glycerin monostearate, POE (15) glycerin monostearate, POE (5) glycerin monooleate, and POE (15) glycerin monooleate.

Examples of the isostearic acid PEG glyceride include isostearic acid PEG (8) glyceride, isostearic acid PEG (10) glyceride, isostearic acid PEG (15) glyceride, isostearic acid PEG (20) glyceride, isostearic acid PEG (25) glyceride, isostearic acid PEG glyceride (30), isostearic acid PEG (40) glyceride, isostearic acid PEG (50) glyceride, isostearic acid PEG (60) glyceride, and the like.

Examples of the silicone surfactants include PEG (7) polydimethylsiloxane and PEG (10) polydimethylsiloxane.

Among them, from the viewpoint of emulsion stability, disintegrating feeling and the like, PEG fatty acid esters, PEG glyceryl isostearate and silicone surfactants are preferable, PEG (60) hydrogenated castor oil, PEG (60) glyceryl isostearate and PEG (10) polydimethylsiloxane are more preferable, and they may be used alone, but they are preferably used in combination.

Optional ingredients

The oil-in-water type emulsion cosmetic of the present disclosure may contain various components as appropriate within a range not affecting the effect of the present invention. Examples of the various components include additional components that can be generally blended in a cosmetic. Examples thereof include a humectant such as 1, 3-butanediol, propylene glycol and glycerin for explosives, an anionic surfactant, a cationic surfactant, an amphoteric surfactant, a water-soluble polymer, an oil-soluble polymer, a film-forming agent such as a polysaccharide organosilicate, a sequestering agent, a lower alcohol such as ethanol, a polyhydric alcohol such as PEG6000 and dipropylene glycol, a higher alcohol other than the above, various extracts, a sugar, an amino acid, an organic amine, a polymer emulsion, a chelating agent, an ultraviolet absorber other than the above, an ultraviolet scattering agent such as zinc oxide, a pH adjuster, a skin nutrient, a vitamin, a drug, a quasi-drug, a cosmetic, and other water-soluble drugs, a whitening agent, an anti-inflammatory agent, an antioxidant, a buffer, an antiseptic, an antioxidant aid, a thickener, a dispersing agent, a propellant, an organic powder, a surfactant, an organic silicon dioxide gas, a silicone oil, and the like, Clay minerals, pigments, dyes, pigments, perfumes, acid components, alkali components, nonpolar oils such as polydimethylsiloxane, etc. These optional ingredients may be used alone or in combination of two or more, and may be appropriately compounded in the oil phase and/or the aqueous phase.

Among such additives, higher alcohols other than the above are preferably used from the viewpoint of suppression of crystallization of the interface film, sense of disintegration, and the like. The higher alcohol is preferably a dihydric higher alcohol, and batyl alcohol is particularly preferable.

In addition, since it is generally difficult to improve the emulsion stability of an oil-in-water type emulsion cosmetic using a polar oil, a thickener, particularly a water-soluble thickener, is generally used to ensure the emulsion stability of such a cosmetic. However, compounding of a thickener may improve emulsion stability, but may adversely affect the feeling of disintegration, that is, achievement of a specific viscosity ratio, and, in addition, may easily give a sticky feeling.

On the other hand, since the emulsion particles (oil droplets) in the oil-in-water emulsion cosmetic of the present disclosure are prepared using specific materials, that is, a linear higher fatty acid having 16 or more carbon atoms, a monohydric higher alcohol, and a nonionic surfactant, the emulsion stability is excellent, and therefore the cosmetic of the present disclosure may not substantially contain a thickener. That is, the thickener may be blended in a proportion of 1 mass% or less, 0.5 mass% or less, 0.1 mass% or less, 0.01 mass% or less, or 0.001 mass% or less with respect to the total amount of the cosmetic, but it is advantageous not to use the thickener from the viewpoint of a sense of disintegration and the like.

In some embodiments, the oil-in-water type emulsion cosmetic of the present disclosure may be blended with a nonpolar oil component such as polydimethylsiloxane as the oil component. Among them, when a volatile acyclic silicone oil is blended, the film strength of an interfacial film such as a gel film or a liquid crystal film formed around oil droplets can be further improved, and therefore, a whitening agent, an anti-inflammatory agent, or other agents that tend to deteriorate emulsion stability can be blended. Further, the use of the volatile acyclic silicone oil capable of improving the film strength of the interfacial film can also increase the static viscosity while suppressing an increase in the dynamic viscosity of the cosmetic, and therefore an increase in the viscosity ratio, that is, a feeling of disintegration can be more easily expressed. The term "volatility" as used herein means that the volatile matter is more than 5% when left at 105 ℃ for 3 hours under atmospheric pressure. From the viewpoint of obtaining excellent film strength and disintegrating feeling, the volatile component that is an indicator of volatility is preferably 10% or more, 20% or more, 40% or more, 50% or more, 60% or more, 80% or more, or 100%. Alternatively, as an indicator of volatility, the boiling point at 1 atmosphere (101.325kPa) can be used. From the viewpoint of obtaining excellent film strength and sense of disintegration, the boiling point is preferably 250 ℃ or lower, 240 ℃ or lower, or 230 ℃ or lower, and is preferably 80 ℃ or higher, 100 ℃ or higher, 120 ℃ or higher, 150 ℃ or higher, or 160 ℃ or higher. In the present disclosure, "nonvolatile" means that the volatile content is 5% or less when left at 105 ℃ for 3 hours.

As the volatile acyclic silicone oil, for example, a volatile linear silicone oil or a volatile branched silicone oil can be used. Among them, volatile linear silicone oils are preferable. The volatile acyclic silicone oil may be used alone or in combination of two or more.

Examples of the volatile linear silicone oil include low-molecular-weight linear dimethylpolysiloxanes such as dimethylpolysiloxane having a viscosity of 0.65cSt (which may be referred to as "polydimethylsiloxane"), dimethylpolysiloxane having a viscosity of 1cSt, dimethylpolysiloxane having a viscosity of 1.5cSt, and dimethylpolysiloxane having a viscosity of 2 cSt. Here, these viscosities refer to kinematic viscosities under an atmosphere of 25 ℃.

Examples of the volatile branched silicone oil include low molecular weight branched silicones such as methylpolytrimethylsiloxane, tris (trimethylsilyl) methylsilane, and tetrakis (trimethylsilyl) silane.

The content of the volatile acyclic silicone oil in the oil-in-water emulsion cosmetic of the present disclosure is not particularly limited, and may be, for example, 0.1% by mass or more, 0.3% by mass or more, 0.5% by mass or more, 0.7% by mass or more, or 1.0% by mass or more, and may be less than 20.0% by mass, 15.0% by mass or less, 10.0% by mass or less, 9.0% by mass or less, 8.0% by mass or less, 7.0% by mass or less, 6.0% by mass or less, 5.0% by mass or less, 4.0% by mass or less, or 3.0% by mass or less, relative to the total amount of the cosmetic. Alternatively, the content of the volatile acyclic silicone oil may be 15 mass% or more, 17 mass% or more, or 20 mass% or more, or may be about 50 mass% or less, about 40 mass% or less, or about 30 mass% or less, relative to the total amount of the oil component.

In several embodiments, the oil-in-water type emulsion cosmetic of the present disclosure may be compounded with a volatile cyclic silicone oil and a non-volatile non-cyclic silicone oil as an oil component. However, when the volatile acyclic silicone oil is blended to further improve the film strength of the interface film, the content of the volatile cyclic silicone oil and the nonvolatile acyclic silicone oil is preferably less than 20.0 mass%, 15.0 mass% or less, 10.0 mass% or less, 7.0 mass% or less, 5.0 mass% or less, 3.0 mass% or less, or 1.0 mass% or less, respectively, with respect to the total amount of the cosmetic. Alternatively, the content of the volatile cyclic silicone oil and the nonvolatile acyclic silicone oil is preferably 10.0% by mass or less, 7.0% by mass or less, 5.0% by mass or less, 3.0% by mass or less, or 1.0% by mass or less, respectively, with respect to the total amount of the oil component. Further, the volatile cyclic silicone oil and/or the nonvolatile acyclic silicone oil is more preferably not blended in the oil component, and particularly preferably not blended in the oil component.

In several embodiments, the oil-in-water type emulsion cosmetic of the present disclosure may be compounded with at least one selected from a whitening agent and an anti-inflammatory agent. Whitening agents and anti-inflammatory agents, particularly acid-type whitening agents and anti-inflammatory agents, salt-type whitening agents and anti-inflammatory agents, generally tend to deteriorate the emulsion stability. However, the oil-in-water type emulsion cosmetic of the present disclosure, which is further improved in the film strength of the interface film by blending a volatile acyclic silicone oil, can exhibit good emulsion stability even when such a whitening agent and an anti-inflammatory agent are blended.

The whitening agent is not particularly limited as long as it exhibits a whitening effect. Examples thereof include at least one acid type whitening agent selected from ascorbic acid (L-ascorbic acid), tranexamic acid, glycyrrhizic acid, nicotinic acid, kojic acid, ellagic acid, 1-piperidinepropionic acid, 3-O-ethyl-L-ascorbic acid, and alkoxysalicylic acid (e.g., 4-methoxysalicylic acid); and at least one salt type whitening agent selected from ascorbate, thrombonate, glycyrrhetate, nicotinate, kojic acid salt, ellagic acid salt, 1-piperidine propionate, 3-O-ethyl-L-ascorbate, and alkoxy salicylate (such as 4-methoxy salicylate). Examples of the salt-type whitening agent include alkali metal salts such as sodium salt and potassium salt; alkaline earth metal salts such as calcium salts and magnesium salts; a zinc salt; a ferric salt; an ammonium salt; salts with basic amino acids such as arginine, lysine, histidine and ornithine; and salts with amines such as monoethanolamine, diethanolamine, and triethanolamine. Examples of the whitening agent include ascorbic acid derivatives (e.g., ascorbyl glucoside), tranexamic acid derivatives, glycyrrhizic acid derivatives, nicotinic acid derivatives, kojic acid derivatives (e.g., kojic dipalmitate), ellagic acid derivatives, alkoxysalicylic acid derivatives, hydroquinone, α -arbutin, β -arbutin, niacinamide, astaxanthin, dimercaptooctanoylhistidine (Na/zinc), chamomile extract, licorice extract, placenta extract, rosemary extract, 4-n-butylresorcinol, and magnolol. The whitening agents may be used alone or in combination of two or more.

The anti-inflammatory agent is not particularly limited as long as it exhibits an anti-inflammatory action. However, agents exhibiting both whitening and anti-inflammatory effects are treated as whitening agents in the present disclosure. Examples of the anti-inflammatory agent include magnesium L-ascorbyl phosphate, glycyrrhizin, dipotassium glycyrrhizinate, ammonium glycyrrhizinate, and allantoin.

The blending amount of the whitening agent and the anti-inflammatory agent is not particularly limited, and may be, for example, 0.01 mass% or more, 0.05 mass% or more, 0.1 mass% or more, 0.3 mass% or more, 0.5 mass% or more, 0.7 mass% or more, or 1.0 mass% or more, and may be 15.0 mass% or less, 10.0 mass% or less, 8.0 mass% or less, or 5.0 mass% or less, independently of each other, with respect to the total amount of the cosmetic.

Use of oil-in-water type emulsified cosmetic

The oil-in-water type emulsion cosmetic of the present disclosure can exhibit a sense of disintegration such that the viscosity of the cosmetic is reduced at a glance when a load is applied. Therefore, the cosmetic of the present disclosure exhibiting such a feeling of use can be used as a cosmetic applied by spreading on the skin or the like, for example. Here, the cosmetic applied to the skin may contain a substance called a skin preparation for external use.

The formulation of the cosmetic of the present disclosure is not particularly limited, and examples thereof include a liquid, an emulsion, a cream, a gel, a spray, and a mousse. Here, the "spray" in the present disclosure may include a mist type spray, an aerosol type spray, and the like.

The form of the cosmetic preparation of the present disclosure is not particularly limited, and examples thereof include facial cosmetics such as lotions, beauty liquids, lotions, and masks; makeup cosmetics such as foundation make-up; sunscreen cosmetic materials (sunscreens); a body cosmetic; skin washing materials such as makeup remover, body shampoo, etc.; hair cosmetics such as shampoo, hair tonic, hair conditioner, shampoo, rinse-off hair conditioner, and hair tonic; ointments and the like.

Method for producing oil-in-water type emulsified cosmetic preparation

The oil-in-water type emulsion cosmetic of the present disclosure can be prepared by a known method such as a dispersion method or an aggregation method.

The dispersion method is a method of making a bulk of a dispersed phase into fine particles by a mechanical force. Specifically, the emulsification is performed by the crushing force of an emulsifier, and examples of such a method include a high-pressure emulsification method in which a high shearing force is applied by using a high-pressure homogenizer.

The agglutination method is a colloid modulation method using surface chemical properties, and is a method in which a material that is a dispersed phase is made supersaturated by some means from a state in which a sample に is uniformly (Japanese text) dissolved, and appears. As specific methods, a liquid crystal emulsification method, an HLB temperature emulsification method, a phase inversion emulsification method, a nonaqueous emulsification method, a D phase emulsification method, and the like are known.

Among these methods, the oil-in-water emulsion cosmetic of the present disclosure is advantageously prepared by a liquid crystal emulsion method from the viewpoint of emulsion stability, disintegrating feeling, and the like. An interface film such as a gel film or a liquid crystal film made of a lamellar liquid crystal or the like is easily formed in the vicinity of the interface of emulsified particles prepared by a liquid crystal emulsification method. As a result, aggregation and coalescence of the emulsified particles are suppressed, emulsion stability is improved, and a sense of disintegration is more likely to be expressed by a strong interface film.

As a method for preparing the cosmetic of the present disclosure by the liquid crystal emulsion method, for example, the following method can be employed. The polar oil, the linear higher fatty acid having 16 or more carbon atoms, the monohydric higher alcohol, the nonionic surfactant, the optional components, and the like can be used in the same manner.

A polar oil, a linear higher fatty acid having 16 or more carbon atoms, a monohydric higher alcohol, a nonionic surfactant, and optionally added oil-soluble optional components are mixed together while heating to about 70 to 90 ℃ to prepare an oil phase solution. Next, the oil-in-water type emulsion cosmetic of the present disclosure can be prepared by mixing water and optionally added water-soluble optional ingredients while heating to about 70 to 90 ℃ to prepare an aqueous phase solution, slowly adding the oil phase solution to the aqueous phase solution while stirring, and then cooling to room temperature.

In the conventional liquid crystal emulsification method, since it was confirmed that an interfacial film such as a gel film or a liquid crystal film is formed around emulsified particles by a lamellar liquid crystal or the like at a stage of being cooled to room temperature, it is considered that the emulsified particles of the present disclosure form such an interfacial film around the emulsified particles at the same stage.

Examples

The present invention will be described in further detail below with reference to examples, but the present invention is not limited thereto. In the following, unless otherwise specified, the blending amount is expressed as mass%.

Examples 1 to 7 and comparative examples 1 to 8

The following evaluations were made with respect to the oil-in-water emulsion cosmetic compositions obtained by the formulations shown in tables 1 to 3 and the production methods shown below, and the results are shown in tables 1 to 3.

Evaluation method

(evaluation of viscosity)

The viscosity of the cosmetic was evaluated by using a B-type viscometer (TVB-10, manufactured by Toyobo industries, Ltd.) under conditions of a spindle number L3, 30 ℃, 0.6rpm and 12 rpm. The results are shown in the table together with the viscosity ratios calculated from the results. Here, in the table,the viscosity measured at 0.6rpm is marked as "V _0.6rpm ", the viscosity measured at 12rpm is marked as" V _12rpm ", the viscosity ratio is marked as" V _0.6rpm /V _12rpm ”。

(evaluation of emulsion stability)

The size of oil droplets within 1 hour after the preparation of the emulsified cosmetic and the size of oil droplets after storage at 50 ℃ for 4 weeks were observed by an optical microscope, and the emulsion stability was evaluated based on the following criteria:

a: little change in droplet size occurs.

B: the oil droplet size is slightly increased.

C: the oil droplet size is significantly increased or the cosmetics are separated.

Method for producing cosmetic

(example 1)

An oil-in-water type emulsion cosmetic was produced by the liquid crystal emulsion method shown below using the formulations shown in table 1. Here, the numbers shown below correspond to the numbers of the display component names on the left side of the prescription in table 1.

While heating to 70 to 90 ℃, the oil components of Nos. 10 to 13 and the ultraviolet absorbers of Nos. 14 and 15 were uniformly mixed, and then the nonionic surfactants of Nos. 1 and 2, the higher alcohols of Nos. 3 and 4, and the behenic acid of No.5, which is a straight-chain higher fatty acid, were further mixed to prepare an oil phase solution.

Next, the materials No.16 to No.23 were added to the ion-exchanged water No.24 while heating to 70 to 90 ℃ and uniformly mixed to prepare an aqueous solution.

The oil-phase solution was slowly added to the aqueous phase solution while heating the solution to 70 to 90 ℃, and the mixture was uniformly dispersed in a dispenser and then cooled to room temperature, thereby obtaining the oil-in-water type emulsion cosmetic of example 1.

(example 2 and comparative examples 1 to 7)

Oil-in-water emulsion cosmetics of example 2 and comparative examples 1 to 7 were obtained in the same manner as in example 1 except that the components and blending amounts of the oil phase solution and the aqueous phase solution were changed to those shown in table 1.

(examples 3 to 6)

Oil-in-water emulsion cosmetic compositions of examples 3 to 6 were obtained in the same manner as in example 1 except that the components and blending amounts of the oil phase solution and the aqueous phase solution were changed to those shown in table 2.

(example 7 and comparative example 8)

Oil-in-water type emulsified cosmetic materials of example 7 and comparative example 8 were obtained in the same manner as in example 1 except that the components and blending amounts of the oil phase solution and the water phase solution were changed to those shown in table 3.

[ Table 1]

Results

As is clear from table 1, the emulsion cosmetics of comparative examples 1 to 7 had a viscosity ratio of less than 7.9, and therefore, even when these cosmetics were applied to the skin and spread, no sense of disintegration was felt. In particular, it is found that the emulsion cosmetics of comparative examples 6 to 7 are poor in emulsion stability. On the other hand, the emulsion cosmetics of examples 1 to 2 were excellent in emulsion stability and had a viscosity ratio of 7.9 or more, and therefore, when these cosmetics were applied to the skin and spread, it was confirmed that they exhibited a good sense of disintegration.

[ Table 2]

TABLE 2

Results

As is clear from comparison between example 1 and example 3, when a volatile acyclic silicone oil polydimethylsiloxane (1.5cst) was used in place of the volatile cyclic silicone oil cyclopentademethicone, the viscosity ratio of the emulsified cosmetic was increased. Further, if these cosmetics were applied to the skin and spread, it was confirmed that the cosmetic of example 3 exhibited a more favorable sense of disintegration. Such properties are considered to be affected by the difference in compatibility of the cyclic silicone oil and the acyclic silicone oil with the components constituting the interfacial film. That is, the acyclic silicone oil has a property of being less compatible with components constituting the interface film than cyclic silicone oils such as cyclopentadimethylsiloxane. Therefore, if a volatile acyclic silicone oil is used as the oil component, the interfacial film constituent component is more easily separated from the oil component than in the case of a cyclic silicone oil that is easily compatible. As a result, it is considered that more interfacial film-forming components move to the vicinity of the interface between the oil phase and the water phase, and thus a stronger interfacial film is formed, and the above-described performance can be exhibited.

The emulsion cosmetics of examples 4 to 6 were prepared by blending the cosmetics of example 3 with various whitening agents. Such whitening agents generally tend to deteriorate emulsion stability, but it has been confirmed that in the case of a cosmetic prepared by using a volatile acyclic silicone oil, the emulsion stability is excellent even when the whitening agent is blended. Further, since the emulsion cosmetics of examples 4 to 6 had a viscosity ratio of 7.9 or more although they contained a whitening agent, it was confirmed that these cosmetics exhibited a good sense of disintegration when applied to the skin and spread.

[ Table 3]

TABLE 3

Results

As is clear from comparison between comparative example 8 and example 7, when a volatile acyclic silicone oil is used in place of a nonvolatile acyclic silicone oil as the oil component, the whitening agent can exhibit good emulsion stability and can achieve a viscosity ratio of 7.9 or more.

Further, it was confirmed that by changing the kind of the nonpolar oil to a volatile acyclic silicone oil, a viscosity ratio of 7.9 or more can be achieved even if the mass ratio of the linear higher fatty acid to the monohydric higher alcohol is less than 0.50.

Claims

1. An oil-in-water type emulsified cosmetic composition comprising:

a dispersion medium comprising water; and

oil droplets dispersed in the dispersion medium,

the oil component contains at least one kind selected from a polar oil having an IOB of 0.10 or more and an ultraviolet absorber having an IOB of 0.10 or more,

viscosity V measured at 0.6rpm using a B-type viscometer at 30 ℃ in an atmosphere _0.6rpm With a viscosity V measured at 12rpm _12rpm Viscosity ratio V of _0.6rpm /V _12rpm Is 7.9 or more.

2. The cosmetic according to claim 1, wherein the mass ratio of the linear higher fatty acid to the monohydric higher alcohol is 0.50 or more.

3. The cosmetic according to claim 1 or 2, wherein the linear higher fatty acid, the higher alcohol, and the nonionic surfactant form an interfacial film of the oil droplets under an atmosphere of 25 ℃.

4. The cosmetic preparation according to any one of claims 1 to 3, wherein the linear higher fatty acid is at least one selected from stearic acid and behenic acid, and the higher alcohol is at least one selected from cetyl alcohol, isostearyl alcohol, stearyl alcohol and behenyl alcohol.

5. The cosmetic according to any one of claims 1 to 4, wherein the oil component contains at least 50% by mass of at least one selected from a polar oil having an IOB of 0.10 or more and an ultraviolet absorber having an IOB of 0.10 or more.

6. The cosmetic according to any one of claims 1 to 5, further comprising a dihydric higher alcohol.

7. The cosmetic according to any one of claims 1 to 6, wherein the oil component further comprises a volatile acyclic silicone oil.

8. The cosmetic according to any one of claims 1 to 7, further comprising at least one selected from a whitening agent and an anti-inflammatory agent.

9. The cosmetic according to any one of claims 1 to 8, wherein the content of the thickener is 1% by mass or less.