JP2016124793A - W/o/w emulsion composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a W/O/W emulsion composition having excellent moisture retention feelings and springy feelings.SOLUTION: A W/O/W emulsion composition comprises di(isostearyl/phytosteryl) dimer dilinoleate.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a W / O / W emulsion composition.

Conventionally, as an emulsified cosmetic, an O / W type emulsion composition in which an oil phase is dispersed in an aqueous phase and a W / O type emulsion composition in which an aqueous phase is dispersed in an oil phase have been widely used. However, in recent years, W / O / W type emulsion compositions in which a W / O type emulsion composition is further dispersed in an aqueous phase have been applied to cosmetics.
The W / O / W type emulsion composition can give a different feeling of use from conventional O / W type emulsion compositions and W / O type emulsion compositions.

  For example, Patent Document 1 provides a W / O / W type emulsion composition that exhibits a fresh feeling of use and stability over time by incorporating an electrolyte in the inner aqueous phase and an alkyl-modified carboxyvinyl polymer in the outer aqueous phase. It is disclosed that it can be done.

By the way, in order to impart a moisturizing effect to cosmetics, oil-soluble humectants such as higher alcohols, liquid paraffin, and ester oils are generally added to cosmetics.
As an oil-soluble humectant, dimer dilinoleic acid di (isostearyl / phytosteryl) which is an ester of a dimer acid derived from a plant is known.
For example, Patent Document 2 discloses an O / W type containing dimer linoleic acid di (isostearyl / phytosteryl), water-soluble polymer, liquid oil, paste-form oil at room temperature, and polyhydric alcohol as essential components. It is disclosed that the external preparation for skin is excellent in terms of moisturizing feeling and the like.
On the other hand, no attempt has been made to add moisturizing sensation by adding dimerlinoleic acid di (isostearyl / phytosteryl) to the W / O / W emulsion composition.

Further, in order to give a firm feeling to the skin, the composition of cosmetics has been conventionally studied. For example, Patent Document 3 describes that, according to an oil-in-water emulsified cosmetic containing a specific higher alcohol, hydrophilic polyoxyethylene alkyl ether, and glycerin monoalkyl ether in a predetermined ratio, a firm feeling can be obtained. Has been.
However, in the W / O / W type emulsified composition, a technique for improving the firmness given to the skin has not been proposed so far.

JP 2002-275029 A JP 2009-40705 A JP 2008-13450 A

The problem to be solved by the present invention is to provide a W / O / W emulsified composition excellent in moisturizing feeling and firmness.
Another object of the present invention is to provide a W / O / W emulsified composition that has excellent moisturizing feeling and firmness and is less likely to cause stickiness.

As described above, dimer linoleic acid di (isostearyl / phytosteryl) has an effect of improving moisturizing feeling. However, the present inventor has shown that the effect of improving the moisturizing feeling obtained when dimerdilinoleic acid di (isostearyl / phytosteryl) is added to the W / O / W type emulsion is the O / W type emulsion. It was found that it is remarkably higher than the effect of improving the moisturizing feeling obtained when it is added.
Moreover, when dimer dilinoleic acid di (isostearyl / phytosteryl) was added to the W / O / W type emulsion, it was found that the feeling of firmness given to the skin was remarkably improved.
These discoveries were surprising that could not be anticipated with conventional common sense.

The present invention which solves the above problems based on these findings is a W / O / W type emulsion composition containing dimer linoleic acid di (isostearyl / phytosteryl).
The W / O / W emulsion composition containing dimer linoleic acid di (isostearyl / phytosteryl) has excellent moisturizing feeling and firmness.

The W / O / W emulsion composition of the present invention preferably contains 1 to 10% by mass of dimer linoleic acid di (isostearyl / phytosteryl).
By setting it as such a form, the stickiness of a W / O / W type emulsion composition can be suppressed.

In a preferred embodiment of the present invention, the outer aqueous phase contains oil phase droplets that do not contain an aqueous phase, and the dimer linoleic acid di (isostearyl / phytosteryl) is contained in the oil phase droplets that do not contain the aqueous phase.
As described above, dimerimlinoleic acid di (isostearyl / phytosteryl) is contained in a single-layer oil phase droplet dispersed in the outer aqueous phase as a (W1 / O1 + O2) / W type emulsified form. The moisturizing feeling and firmness of the W / O / W emulsion composition can be improved.

In a preferred embodiment of the present invention, the content of the water-soluble polymer is 0.1% by mass or less.
Thus, the stickiness of a W / O / W type emulsion composition can be suppressed by making content of a water-soluble polymer into the said range.

  This invention exists also in the cosmetics containing a W / O / W type | mold emulsion composition. The cosmetic of the present invention has excellent moisturizing feeling and firmness.

  According to the present invention, it is possible to provide a W / O / W emulsion composition having an excellent moisturizing feeling and firmness.

It is the schematic of a W / O / W type emulsion composition. It is a conceptual diagram of the change of the storage elastic modulus G 'with respect to the increase in stress when the storage elastic modulus G' is measured while increasing the stress applied to the W / O / W emulsion composition. For Examples 5 to 9, oscillation measurement using a rheometer, the stress was changed under the conditions of a gap of 1 mm, 1 Hz, and 20 ° C., and the storage elastic modulus G ′ was measured. The graph which plotted rate G 'is shown.

The present invention is a W / O / W type emulsion composition containing dimer linoleic acid di (isostearyl / phytosteryl).
Hereinafter, the present invention will be described in more detail.

  In the present invention, the W / O / W emulsion composition refers to an emulsion composition in which a W / O emulsion composition (also referred to as a primary emulsion) is further dispersed in an aqueous phase. And the oil droplet which includes the water phase (inner water phase) dispersed in the water phase (outer water phase) which is the outermost phase in the W / O / W emulsion composition is referred to as W / O particles.

In the present invention, oil droplets that do not contain an aqueous phase may be further dispersed in the outer aqueous phase.
Hereinafter, as shown in FIG. 1, the inner aqueous phase is referred to as W1, the outer aqueous phase is referred to as W2, the oil phase including the aqueous phase is referred to as O1, and the oil phase not including the aqueous phase is referred to as O2 in the present specification.
Further, in the present specification, a W / O / W type emulsion composition in which oil droplets that do not contain an aqueous phase are further dispersed in an external aqueous phase, particularly a (W / O1 + O2) / W type emulsion composition. That's it.

The W / O / W emulsion composition of the present invention contains dimer dilinoleic acid di (isostearyl / phytosteryl).
A W / O / W emulsion composition containing dimer linoleic acid di (isostearyl / phytosteryl) is excellent in moisturizing feeling and firmness.

  In the present invention, dimer linoleic acid di (isostearyl / phytosteryl) can be purchased from Nippon Seika Co., Ltd. under the trademark “LUSPLAN PI-DA”.

Dimer linoleic acid di (isostearyl / phytosteryl) is a lipophilic molecule and can therefore be contained in the oil phase.
When the present invention is a (W / O1 + O2) / W type emulsion composition, dimer linoleic acid di (isostearyl / phytosteryl) may be contained in either O1 or O2.
In a preferred embodiment of the present invention, dimer dilinoleic acid di (isostearyl / phytosteryl) is included in O2.
The present invention of such an embodiment is particularly excellent in moisturizing feeling and firmness.

In embodiment of this invention, content of dimer dilinoleic acid di (isostearyl / phytosteryl) becomes like this. Preferably it is 1-10 mass%, More preferably, it is 2-5 mass%.
By setting the content of dimer linoleic acid di (isostearyl / phytosteryl) in the above range, it is possible to improve moisturizing feeling and firmness when using the W / O / W emulsion composition.
Moreover, by setting it as such a form, the W / O / W type emulsification composition which is hard to produce stickiness can be provided.

In the W / O / W type emulsion composition of the present invention, dimer linoleic acid di (isostearyl / phytosteryl) is preferably 1 with respect to the total amount of the oil phase component contained in the W / O / W type emulsion composition. It is -30 mass%, More preferably, it is 3-15 mass%.
By setting the content of dimer dilinoleic acid di (isostearyl / phytosteryl) in the oil phase to be in the above range, it is possible to improve the moisturizing feeling and firmness when using the W / O / W emulsion composition.

In the embodiment of the present invention, the mass ratio of W1 and O1 in the W / O / W emulsion composition is preferably 10: 1 to 1:10, more preferably 5: 1 to 1: 5, and even more preferably. 2: 1 to 1: 2.
By setting the mass ratio of W1 and O1 within the above range, the moisturizing feeling of the W / O / W type emulsion composition can be improved, and stickiness can be suppressed.

In the embodiment of the present invention, the mass ratio of W1 and W2 in the W / O / W emulsion composition is preferably 1: 4 to 1:10, more preferably 1: 5 to 1: 9, and even more preferably 1. : 6 to 1: 8.
By setting the mass ratio of W1 and W2 in the above range, it is possible to improve the moisturizing feeling during use of the W / O / W emulsion composition.

In the embodiment of the present invention, the mass ratio of the total amount of the water phase and the total amount of the oil phase in the W / O / W type emulsion composition is preferably 20: 1 to 0.5: 1, more preferably 10: 1. To 1: 1, more preferably 5: 1 to 1.5: 1.
By setting the mass ratio of the water phase to the oil phase in the above range, the moisturizing feeling of the W / O / W emulsion composition can be improved, and stickiness can be suppressed.

When the present invention is a (W / O1 + O2) / W type emulsion composition, the mass ratio of O1 and O2 is preferably 5: 1 to 1: 1, more preferably 4: 1 to 1.5: 1. More preferably, the ratio is 3: 1 to 2: 1.
By setting the mass ratio of O1 and O2 in the above range, it is possible to provide a W / O / W type emulsion composition having a better moisturizing feeling.

  The oil content contained in the oil phase is not particularly limited, and liquid oils, solid oils, waxes, hydrocarbon oils, higher fatty acids, higher alcohols, synthetic ester oils, silicone oils, and the like can be used.

  Examples of liquid oils include avocado oil, camellia oil, turtle oil, macadamia nut oil, corn oil, mink oil, olive oil, rapeseed oil, egg yolk oil, sesame oil, persic oil, wheat germ oil, southern castor oil, castor oil, linseed oil , Safflower oil, cottonseed oil, eno oil, meadow foam oil, soybean oil, peanut oil, tea seed oil, kaya oil, rice bran oil, cinnagari oil, Japanese kiri oil, jojoba oil, germ oil, triglycerin, glycerin trioctanoate, Examples include glycerin triisopalmitate.

  Solid fats and oils include cocoa butter, coconut oil, horse fat, hydrogenated coconut oil, palm oil, beef tallow, sheep fat, hardened beef tallow, palm kernel oil, pork fat, beef bone fat, owl kernel oil, hydrogenated oil, and cow leg fat. , Mole, hardened castor oil, and the like.

  The waxes include beeswax, candelilla wax, cotton wax, carnauba wax, bayberry wax, ibota wax, whale wax, montan wax, nuka wax, lanolin, kapok wax, lanolin acetate, liquid lanolin, sugar cane wax, lanolin fatty acid isopropyl, lauryl hexyl, reduced lanolin, jojojo Examples thereof include a wax, hard lanolin, shellac wax, POE lanolin alcohol ether, POE lanolin alcohol acetate, POE cholesterol ether, lanolin fatty acid polyethylene glycol, POE hydrogenated lanolin alcohol ether, and the like.

  Examples of the hydrocarbon oil include liquid paraffin, ozokerite, pristane, paraffin, ceresin, squalene, petrolatum, and microcrystalline wax.

  Examples of higher fatty acids include lauric acid, myristic acid, palmitic acid, stearic acid, behen (behenine) acid, 12-hydroxystearic acid, undecylenic acid, and toric acid.

  Examples of the higher alcohol include cetyl alcohol, stearyl alcohol, behenyl alcohol, batyl alcohol, myristyl alcohol, cetostearyl alcohol, and the like.

  Synthetic ester oils include isopropyl myristate, cetyl octanoate, octyldodecyl myristate, isopropyl palmitate, butyl stearate, hexyl laurate, myristyl myristate, decyl oleate, hexyl decyl dimethyloctanoate, cetyl lactate, myristyl lactate Lanolin acetate, isocetyl stearate, isocetyl isostearate, sucrose stearate, sucrose oleate, cholesteryl 12-hydroxystearylate, ethylene glycol di-2-ethylhexylate, dipentaerythritol fatty acid ester, N-alkyl glycol monoisostearate, Neopentyl glycol dicaprate, diisostearyl malate, glycerin di-2-heptylundecanoate, tri-2-ethyl Trimethylolpropane xylate, trimethylolpropane triisostearate, pentane erythritol tetra-2-ethylhexylate, glycerin tri-2-ethylhexylate, trimethylolpropane triisostearate, cetyl 2-ethylhexanoate, 2-ethylhexyl palmitate Glyceryl trimyristate, glyceride tri-2-heptylundecanoate, castor oil fatty acid methyl ester, oleic acid oil, cetostearyl alcohol, acetoglyceride, 2-heptylundecyl palmitate, cetyl palmitate, diisobutyl adipate, N- Lauroyl-L-glutamic acid-2-octyldodecyl ester, di-2-heptylundecyl adipate, ethyl laurate, di-2-ethyl sebacate Hexyl myristate 2-hexyl decyl palmitate, 2-hexyldecyl, 2-hexyldecyl adipate, sebacic acid diisopropyl, 2-ethylhexyl succinate, ethyl acetate, butyl acetate, amyl acetate, and triethyl citrate.

  Examples of silicone oils include chain polysiloxanes such as dimethylpolysiloxane, methylphenylpolysiloxane, and methylhydrogenpolysiloxane, and cyclic polysiloxanes such as decamethylpolysiloxane, dodecamethylpolysiloxane, and tetramethyltetrahydrogenpolysiloxane. Is mentioned.

  1 type (s) or 2 or more types can be used for an oil component.

In the embodiment of the present invention, it is usually preferable to contain an emulsifier used when forming an emulsion composition.
As an emulsifier in the present invention, any of an ionic surfactant and a nonionic surfactant can be used without limitation.

  Examples of the ionic surfactant include fatty acid soaps such as sodium laurate, sodium stearate, potassium stearate, and potassium palmitate, higher alkyl sulfates such as sodium lauryl sulfate and potassium lauryl sulfate, and polyoxyethylene lauryl sulfate. Alkyl ether sulfates such as triliethanolamine, N-acyl sarcosine acids such as sodium lauroyl sarcosine, higher fatty acid amide sulfonates such as sodium N-myristoyl-N-methyl taurate, sodium polyoxyethylene oleyl ether phosphate, Phosphate ester salts such as polyoxyethylene stearyl ether phosphate, sulfosuccinates such as sodium di-2-ethylhexylsulfosuccinate, sodium dodecylbenzenesulfonate N-acyl glutamate such as triethanolamine dodecylbenzenesulfonate, alkylbenzenesulfonate such as dodecylbenzenesulfonate, monosodium N-lauroylglutamate, disodium N-stearoylglutamate, monosodium N-myristoyl-L-glutamate Etc.

Nonionic surfactants include, for example, polyoxyethylene alkyl ether type activators such as polyoxyethylene oleyl ether, ester type activators such as polyoxyethylene hydrogenated castor oil, and polyoxyethylene glyceryl monoisostearate. Polyhydric alcohol fatty acid ester type surfactants such as ethylene oxide addition type surfactants such as ether / ester type surfactants such as glycerol, and glycerin fatty acid esters such as glyceryl monostearate, sorbitan fatty acid esters such as sorbitan monolaurate, etc. Is mentioned. Moreover, polyether modified silicone etc. are mentioned as a silicone type surfactant.
In a more preferred embodiment of the present invention, a silicone surfactant is used as an emulsifier.

In the embodiment of the present invention, the content of the surfactant in the W / O / W emulsion composition is preferably 0.01 to 5% by mass, more preferably 0.1 to 3% by mass, and still more preferably. 0.5 to 2% by mass.
By setting the content of the surfactant in the above range, it becomes possible to improve the stability of the W / O / W emulsion composition.

In embodiment of this invention, when preparing the W / O type | mold emulsion composition which is a primary emulsion (primary emulsification process mentioned later), Preferably it is 1-10 with respect to the whole W / O type | mold emulsion composition. The surfactant is added in an amount of mass%, more preferably 2 to 7 mass%.
By making the addition amount of the surfactant added in the preparation of the W / O type emulsion composition within the above range, the stability of the W / O type emulsion composition, and thus the W / O / W type emulsion composition can be improved. It becomes possible to improve.

In the embodiment of the present invention, when the W / O type emulsion composition is dispersed in the outer aqueous phase to prepare the W / O / W type emulsion composition (secondary emulsification step described later), W / O / Preferably, 0.1 to 2% by mass, more preferably 0.3 to 1% by mass of a surfactant is added to the entire W-type emulsion composition.
By making the addition amount of the surfactant added during the preparation of the W / O / W emulsion composition within the above range, the stability of the W / O / W emulsion composition can be improved. .

In a preferred embodiment of the present invention, an organically modified clay mineral is contained.
By containing the organically modified clay mineral, the stability of the W / O / W emulsion composition can be further improved.

In a more preferred embodiment of the present invention, the W / O particles contain an organically modified clay mineral.
When the W / O particles contain an organically modified viscosity mineral, the stability of the W / O / W emulsion composition can be further improved.

The organically modified clay mineral is a clay mineral in which a part of an organic compound is bonded to a part of the clay mineral through a covalent bond or an ionic bond. Examples of the clay mineral include skmetite-type hectorite, bentonite, montmorillonite, kaolinite, illite, marine clay mineral (sea mud), desert rose clay mineral, and pascalite.
Examples of the organic compound include compounds having a quaternary amino group. Specific examples include stearyl trimethyl ammonium chloride and dimethyl distearyl ammonium chloride.
In the embodiment of the present invention, it is preferable to use dimethyl distearyl ammonium chloride modified hectorite (distearyl dimonium hectorite) as the organically modified clay mineral.
By containing dimethyl distearyl ammonium chloride modified hectorite, the stability of the W / O / W emulsion composition is further improved.
Moreover, it becomes possible to improve the gap feeling of the W / O / W emulsion composition.

In a preferred embodiment of the present invention, the W / O particles contain a silicone surfactant.
By making the W / O particles contain a silicone-based surfactant, the stability of the W / O / W emulsion composition can be improved.

In a more preferred embodiment of the present invention, the W / O particles contain an organically modified clay mineral and a silicone surfactant.
By making the W / O particles contain an organically modified clay mineral and a silicone-based surfactant, the stability of the W / O / W emulsion composition can be improved.

In a preferred embodiment of the present invention, the content of the water-soluble polymer is preferably 0.3% by mass or less, more preferably 0.1% by mass or less, and further preferably 0.05% by mass or less.
By making content of water-soluble polymer into the said range, stickiness of a W / O / W type | mold emulsion composition can be suppressed.

  Here, the water-soluble polymer refers to those having a viscosity-imparting effect, such as arabiya gum, tragacanth gum, karaya gum, xanthan gum, tamarind gum, guar gum, hydroxypropyl guar gum, locust bean gum, quince seed, gellan gum, native gellan gum, polyacrylic acid , Polymethacrylic acid, polyvinyl alcohol, polyethylene glycol, polyvinyl pyrrolidone, polyacrylamide, polymethacrylamide, methacryloyloxyethyltrimethylammonium chloride, methacrylamidepropyltrimethylammonium chloride, Nn-butoxymethylacrylamide, N-iso-butoxy Acrylamide, tert-butylacrylamide sulfonic acid, dimethylaminopropyl methacrylate Or a copolymer of these polymerizable monomer raw materials and other polymerizable monomers, or methyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, carboxymethyl cellulose, alginic acid, carrageenan, hyaluronic acid, chondroitin sulfate, dermatan sulfate, collagen, chitin Derivatives, pectin, gelatin, carboxyvinyl polymer, acrylic acid / alkyl methacrylate copolymer, and salts thereof.

In preferable embodiment of this invention, content of the carboxy vinyl polymer which may be modified | denatured among the said water-soluble polymer becomes like this. Preferably it is 0.3 mass% or less, More preferably, it is 0.03 mass% or less. is there.
In a further preferred embodiment of the present invention, the carboxyvinyl polymer which may be modified is not included.
By setting the content of the carboxyvinyl polymer which may be modified within the above range, stickiness of the W / O / W emulsion composition can be suppressed.

In a preferred embodiment of the present invention, the inner aqueous phase does not contain an electrolyte.
By making it the form which does not contain an electrolyte in an inner water phase, stability of a W / O / W type | mold emulsion composition can be improved.

In a preferred embodiment of the W / O / W emulsified composition of the present invention, the storage elastic modulus G ′ is measured with a rheometer while increasing the stress under the conditions of oscillation measurement, gap 1 mm, 1 Hz, 20 ° C. The storage elastic modulus G ′ at a stress of 1 Pa is 2000 Pa or more, and contains 15% by mass or more of W / O particles.
The W / O / W type emulsified composition of such an embodiment has a rich and dense tactile sensation (bright feeling) from before application to the skin to the initial stage of application, and is light from the middle to the final stage of application. It has a unique feeling of use that gives the skin a pleasant feeling of use, that is, a gap.
W / O / W type emulsification with a feeling of use that gives a feeling of gap to the W / O / W type emulsified composition, so that a moisturizing feeling and a firm feeling spread from the middle to the final stage of application to the skin. A composition can be provided.
Hereinafter, the embodiment will be described in more detail.

In this specification, the feeling of gap refers to a unique feeling of use that has a rich feeling in the initial stage of application from before application to the skin, and turns into a good feeling of elongation as the application proceeds.
In addition, richness refers to a rich and dense tactile sensation, and good stretch feel refers to a comfortable feel that spreads lightly on the skin.
The feeling of gap can be evaluated by sensory evaluation. Specifically, it can be evaluated by performing sensory evaluation on the rich feeling and the feeling of use with good elongation.
The feeling of gap can also be evaluated using a commercially available rheometer. Specifically, it can be evaluated by measuring the storage elastic modulus G ′ when the stress is changed.

Hereinafter, the W / O / W emulsion composition of the present invention will be described with reference to FIG. FIG. 2 is a conceptual diagram of the change in the storage elastic modulus G ′ with respect to the increase in stress when the storage elastic modulus G ′ is measured while increasing the stress applied to the W / O / W emulsion composition. Here, the storage elastic modulus G ′ is measured by a rheometer while increasing stress under the conditions of oscillation measurement, gap 1 mm, 1 Hz, and 20 ° C.
As shown in FIG. 2, the storage elastic modulus G ′ of the W / O / W type emulsion composition of the above embodiment is 2000 Pa or more when the stress is 1 Pa. In addition, the storage elastic modulus G ′ of the W / O / W emulsion composition of the above embodiment is preferably 3000 Pa or more, more preferably 4000 to 10,000 Pa when the stress is 1 Pa. That is, the W / O / W emulsion composition of the above embodiment is an emulsion composition having a certain level of hardness before application to the skin.
In order to adjust the storage elastic modulus G ′ at a stress of 1 Pa to the above range, the viscosity of the outer water phase may be adjusted. The higher the viscosity of the outer water phase, the higher the storage elastic modulus G ′ at a stress of 1 Pa.
As a method for adjusting the viscosity of the outer aqueous phase, specifically, adjustment of the concentration of the thickener in the outer aqueous phase, and the amount of W / O particles to be dispersed in the outer aqueous phase or the oil phase not including the aqueous phase And the formation of an α gel by a higher alcohol and a hydrophilic surfactant in the outer aqueous phase.
The formation of α gel in the outer water phase will be described in detail later.

By the way, when the W / O / W type emulsion composition is applied to the skin, naturally the stress is applied to the composition, and the W / O / W type emulsion composition is viscoelastic according to the applied stress. Indicates.
The present inventors have found that the relationship between the stress measured under the above conditions and the storage elastic modulus G ′ is a change in feel from the initial application stage to the final application stage when the W / O / W emulsion composition is applied to the skin. I found out that it was expressed clearly.
Specifically, it has been found that the stage where the stress of about 1 to 100 Pa is applied can be assumed to be the stress applied to the W / O / W emulsion composition in the initial stage of application to the skin (FIG. 2). ). Moreover, it can be assumed that the stage where the stress greater than 80 Pa, for example, the stress greater than 90 Pa or the stress greater than 100 Pa is applied, is a stress applied to the W / O / W emulsified composition after the middle of application to the skin. (FIG. 2).
In the W / O / W type emulsified composition of a preferred embodiment of the present invention, when stress is applied under the above conditions, the storage elastic modulus G ′ is within a range where the applied stress is relatively small, for example, about 1 to 100 Pa. Is hardly affected by changes in stress. However, when a certain stress is exceeded, for example, in a range exceeding 80 Pa, the storage elastic modulus G ′ decreases significantly as the stress increases (FIG. 2). This remarkable decrease in the storage elastic modulus G ′ affects the gap feeling that characterizes the unique feeling of use of the embodiment.

The W / O / W emulsion composition of the present invention preferably has a storage elastic modulus G ′ of 2000 Pa or more, preferably 3000 Pa or more in the initial stage of coating, that is, in the range of stress of 1 to 80 Pa. More preferably, it is 4000 Pa or more.
By setting the storage elastic modulus G ′ at a stress of 1 to 80 Pa in the above range, it is possible to provide a W / O / W type emulsion composition that exhibits excellent richness in the initial stage of application to the skin.

Moreover, it is preferable that the W / O / W type emulsified composition of the present invention has a large storage elastic modulus G ′ even when a larger stress is applied. Specifically, the W / O / W type emulsion composition of the above embodiment preferably has a storage elastic modulus G ′ of 2000 Pa or more at a stress of 90 Pa when the storage elastic modulus G ′ is measured under the above conditions. The storage elastic modulus G ′ is more preferably 2000 Pa or more at a stress of 100 Pa, and the storage elastic modulus G ′ is more preferably 2000 Pa or more at 120 Pa.
In this way, even when a larger stress is applied, the structure exhibiting a large storage elastic modulus G ′ provides a sufficient rich feeling during a certain period in the initial stage of application to the skin. An O / W emulsion composition can be provided.
In order to adjust the storage elastic modulus G ′ at the stress within the above range, the viscosity of the outer water phase may be adjusted. The higher the viscosity of the outer water phase, the higher the storage elastic modulus G ′.
As a method for adjusting the viscosity of the outer aqueous phase, specifically, adjustment of the concentration of the thickener in the outer aqueous phase, and the amount of W / O particles to be dispersed in the outer aqueous phase or the oil phase not including the aqueous phase And the formation of an α gel by a higher alcohol and a hydrophilic surfactant in the outer aqueous phase.
The formation of α gel in the outer water phase will be described in detail later.

Moreover, when the storage elastic modulus G ′ is measured by the above-described method, the W / O / W emulsion composition of the present invention has a decrease in the storage elastic modulus G ′ of 500 Pa in the stress range of 1 to 80 Pa. Or less, more preferably 300 Pa or less, and even more preferably 150 Pa or less.
Also, the amount of decrease in the storage elastic modulus G ′ is preferably in the above range even in the range of stress of preferably 1 to 90 Pa, more preferably 1 to 100 Pa.
By setting the amount of decrease in the storage elastic modulus G ′ in the stress range to be in the above range, an excellent rich feeling can be maintained during the initial operation of application to the skin. It becomes possible to notice a change in the feeling of use.

In order to adjust the amount of decrease in the storage elastic modulus G ′ in the above-described stress range to the above range, the content of W / O particles and the particle diameter of W / O particles may be adjusted. The higher the content of W / O particles, the smaller the amount of decrease in storage modulus G ′ in the stress range. Moreover, the amount of decrease in the storage elastic modulus G ′ at a stress of 1 to 80 Pa decreases as the particle diameter of the W / O particles increases.
Specifically, it can be realized by adjusting the content of the W / O particles, preferably the particle diameter of the W / O particles in addition to this, to a range described later.

The W / O / W emulsion composition of the present invention has a storage elastic modulus G with respect to an increase in stress of 100 Pa in a stress range exceeding 80 Pa when the storage elastic modulus G ′ is measured by the method described above. It is preferable that the amount of decrease of ′ is in the range of 2000 Pa or more (FIG. 2).
In the W / O / W emulsified composition of the above embodiment, the amount of decrease in the storage elastic modulus G ′ with respect to the amount of increase in stress of 100 Pa is preferably 3000 Pa or more, more preferably 4000 Pa or more.
By setting it as such a form, the W / O / W type | mold emulsion composition which has a more unique feeling of use with a large difference of the tactile sensation felt in the initial stage of application | coating to skin and after the middle stage can be provided.
In order to adjust the amount of decrease in the storage elastic modulus G ′ in the above-described stress range to the above range, the content of W / O particles and the particle diameter of W / O particles may be adjusted. The higher the content of W / O particles, the smaller the amount of decrease in storage modulus G ′ in the stress range. Moreover, the amount of decrease in the storage elastic modulus G ′ at a stress of 1 to 80 Pa decreases as the particle diameter of the W / O particles increases.
Specifically, it can be realized by adjusting the content of the W / O particles, preferably the particle diameter of the W / O particles in addition to this, to a range described later.

  By the way, as shown in FIG. 2, when the amount of change in stress is ΔX and the amount of change in storage elastic modulus G ′ is ΔY, the numerical value (ΔY / ΔX) obtained by dividing ΔY by ΔX corresponds to the amount of change in stress. This represents the amount of change in the storage elastic modulus G ′. That is, as the value of (ΔY / ΔX) increases in the negative direction, the amount of decrease in the storage elastic modulus G ′ corresponding to the amount of increase in stress increases, that is, the storage elastic modulus G ′ decreases rapidly. The present inventors have found that the gap feeling can be exhibited extremely remarkably by setting the value of (ΔY / ΔX) within the following range.

That is, in the W / O / W type emulsion composition of the above embodiment, the amount of decrease in the storage elastic modulus G ′ with respect to the amount of increase in stress is 50 Pa or more in the stress range exceeding 80 Pa, preferably 90 Pa, more preferably 100 Pa. ((ΔY / ΔX) value is −50 or less).
Further, it is preferable that the amount of decrease in the storage elastic modulus G ′ is in a range of 55 Pa or more (the value of (ΔY / ΔX) is −55 or less).
As described above, the W / O / W type emulsified composition according to the embodiment in which the storage elastic modulus G ′ is rapidly reduced according to the increase in the stress has a moisturizing feeling and a firm feeling on the skin from the rich feeling. It shows a drastic change in the feeling of use to a good feeling of spreading and has a very unique feeling of use.
The larger the content of W / O particles, the smaller the value of (ΔY / ΔX). Therefore, by adjusting the content of the W / O particles, it is possible to provide a W / O / W type emulsion composition that exhibits a value of (ΔY / ΔX) within the above range.

In the W / O / W emulsion composition of the present invention, the content of W / O particles is preferably 15% by mass or more, more preferably 15-30% by mass, and more preferably 15-20% by mass. %, More preferably 16 to 18% by mass.
By setting the content of the W / O particles in the above range, it is possible to improve the feeling of use with good elongation that spreads the moisturizing feeling and firmness to the skin from the middle to the final stage of application to the skin.
In addition, the amount of the W / O type emulsion composition (primary emulsion) to be added to the outer aqueous phase in the W / O / W type emulsion composition preparation step, which will be described later, is the amount of W in the W / O / W type emulsion composition. / O particle content. That is, the content of the desired W / O particles can be obtained by adjusting the amount of the primary emulsion to be dispersed in the outer aqueous phase.

In the W / O / W emulsion composition of the present invention, the average particle size of the W / O particles is preferably 10 μm or more, more preferably 10 to 30 μm, and still more preferably 10 to 20 μm.
By setting the average particle diameter of the W / O particles in the above range, it is possible to improve the richness that is felt in the initial stage of application from before application to the skin. In addition, it is possible to improve the feeling of use in which the moisturizing feeling and firmness spread from the middle stage to the final stage of application to the skin. That is, the W / O / W type emulsified composition of such an embodiment has a unique feeling of use with a large difference between the feeling of richness and the feeling of good elongation.

As will be described later, the particle size of the W / O particles is obtained by combining the stirring conditions such as the type of the stirring and mixing device used for dispersing the primary emulsion in the outer aqueous phase, the number of rotations thereof, and the stirring time. The target particle size range can be controlled.
As will be described later, when the primary emulsion is dispersed in the outer aqueous phase by a membrane emulsification method, the particle size of the W / O particles can be adjusted by the pore size of the porous membrane used for membrane emulsification.

  In addition, the average particle diameter of the W / O particles in the present specification is an average obtained by measuring the particle diameters of about 100 W / O particles arbitrarily selected in the micrograph of the W / O / W emulsion composition. Say the value you did.

In a preferred embodiment of the present invention, an α gel formed by a hydrophilic surfactant and a higher alcohol is contained in the outer aqueous phase.
By adopting such an embodiment, W / O / W type emulsification with excellent high-temperature stability is suppressed by coalescence and drainage of W / O particles by the action of α-gel formed in the outer aqueous phase. A composition can be provided. That is, the W / O / W type emulsified composition of the present invention of such an embodiment maintains an excellent moisturizing feeling and firmness even after being stored at a high temperature.

In a more preferred embodiment of the present invention, at least an ionic surfactant is contained as the hydrophilic surfactant.
By using an ionic surfactant, the high temperature stability of the W / O / W emulsion composition can be further improved.
Although it does not restrict | limit especially as an ionic surfactant, Fatty acid salts, such as sodium laurate, sodium stearate, potassium stearate, potassium palmitate, polyoxyethylene alkyl ether phosphoric acid and its salt, alkaloyl alkyl taurine salt, Preferred examples include alkaloyl glutamate, alkaloyl lactate, alkyltrimethylammonium chloride, 2-alkyl-N-carboxymethyl-N-hydroxyethylimidazolinium betaine, polyoxyethylene alkyl ether sulfate, alkylamidoamine and salts thereof. it can.
In a preferred embodiment of the present invention, a fatty acid salt is contained as an ionic surfactant.

In a more preferred embodiment of the present invention, the hydrophilic surfactant is a nonionic system having an HLB of 8 or more, more preferably 10 or more, more preferably 12 or more, further preferably 14 or more, more preferably 16 or more. Contains a surfactant.
By using such a highly hydrophilic surfactant, the high temperature stability of the W / O / W emulsion composition can be further improved.
In addition, HLB in this specification means the HLB calculated by the Griffin method.

  The nonionic surfactant described above is not particularly limited as long as it can form an α gel with a higher alcohol, and is used in combination with a lipophilic surfactant that does not form an α gel within a range that can form an α gel structure. Polyoxyethylene alkyl ether, polyoxyethylene polyoxypropylene alkyl ether, sorbitan fatty acid ester, glycerin monoalkyl ester, polyether fatty acid ester, polyoxyethylene hydrogenated castor oil, polyoxyethylene castor oil, Polyoxyethylene glycerin alkyl ester, polyoxyethylene alkyl ether alkyl ester, polyoxyethylene sorbitan alkyl ester, polyglycerin alkyl ester, pyroglutamic acid ester, dimethicone copolyol, polyether Sex dimethicone, and the like.

In preferable embodiment of this invention, content of the said hydrophilic surfactant becomes like this. Preferably it is 0.01-5 mass%, More preferably, it is 0.1-3 mass%, More preferably, it is 0.5-2 mass %.
By making the content of the hydrophilic surfactant within the above range, a W / O / W type emulsification that exhibits excellent moisturizing feeling and firmness even after being stored at a high temperature for a longer period of time. A composition can be provided.

In preferable embodiment of this invention, carbon number of the said higher alcohol becomes like this. Preferably it is 8-22, More preferably, it is 16-22, More preferably, it is 16-18.
By using a higher alcohol having a carbon number in the above range, a W / O / W type emulsion composition that exhibits excellent moisturizing feeling and firmness even after being stored at a high temperature for a longer period of time is provided. can do.

  The higher alcohol is not particularly limited as long as it can form an α gel with the hydrophilic surfactant, and includes lauryl alcohol, batyl alcohol, cetyl alcohol, stearyl alcohol, behenyl alcohol, myristyl alcohol, oleyl alcohol, cetanol and the like. Is mentioned.

In preferable embodiment of this invention, content of the said higher alcohol is 0.1-10 mass%, More preferably, it is 0.5-5 mass%, More preferably, it is 2-3 mass%.
By providing the higher alcohol content within the above range, a W / O / W emulsion composition that exhibits excellent moisturizing feeling and firmness even after being stored at a high temperature for a longer period of time is provided. can do.

In a preferred embodiment of the present invention, the molar ratio of the higher alcohol to the hydrophilic surfactant is 1: 1 to 20: 1, preferably 1.5: 1 to 10: 1, more preferably 2: 1. ~ 5: 1.
By setting the molar ratio of the higher alcohol to the hydrophilic surfactant within the above range, W / O / W exhibits excellent moisturizing feeling and firmness even after being stored at a higher temperature for a longer period of time. A mold emulsion composition can be provided.

In a preferred embodiment of the present invention, the mass ratio of the content of W / O particles dispersed in the outer aqueous phase and the total amount of the hydrophilic surfactant and the higher alcohol is preferably 1: 1 to 10: 1. More preferably, it is 2: 1 to 7: 1, and further preferably 3: 1 to 5: 1.
By making the mass ratio of the W / O particles, the hydrophilic surfactant and the higher alcohol within the above range, excellent moisturizing feeling and firmness can be exhibited even after long-term storage at high temperatures. A W / O / W emulsion composition can be provided.

  The W / O / W type emulsified cosmetic of the present invention may be blended with optional additive components that are usually blended in cosmetics as long as the effects of the present invention are not impaired. Examples of such additive components include humectants such as polyethylene glycol, glycerin, 1,3-butylene glycol, erythritol, sorbitol, xylitol, and maltitol; lower alcohols such as ethanol; butylhydroxytoluene, tocopherol, and phytin. Antioxidants; antibacterial agents such as benzoic acid, salicylic acid, sorbic acid, paraoxybenzoic acid alkyl ester, hexachlorophene; paraaminobenzoic acid (hereinafter abbreviated as “PABA”), PABA monoglycerin ester, N, N-dipropoxy PABA ethyl ester N, N-diethoxy PABA ethyl ester, N, N-dimethyl PABA methyl ester, N, N-dimethyl PABA ethyl ester, N, N-dimethyl PABA butyl ester, N, N-dimethyl P Benzoic acid UV absorbers such as BA2-ethylhexyl ester; Anthranilic acid UV absorbers such as homomenthyl-N-acetylanthranilate; Amyl salicylate, menthyl salicylate, homomenthyl salicylate, octyl salicylate, phenyl salicylate, benzyl salicylate, p -Salicylic acid ultraviolet absorbers such as isopropanol phenyl salicylate; octylcinnamate, ethyl-4-isopropylcinnamate, methyl-2,5-diisopropylcinnamate, ethyl-2,4-diisopropylcinnamate, methyl-2,4- Diisopropyl cinnamate, propyl-p-methoxycinnamate, isopropyl-p-methoxycinnamate, isoamyl-p-methoxycinnamate, octyl-p-methoxy Cinnamate (2-ethylhexyl-p-methoxycinnamate), 2-ethoxyethyl-p-methoxycinnamate, cyclohexyl-p-methoxycinnamate, ethyl-α-cyano-β-phenylcinnamate, 2-ethylhexyl-α- Cinnamic acid-based UV absorbers such as cyano-β-phenylcinnamate and glyceryl mono-2-ethylhexanoyl-diparamethoxycinnamate; [3-bis (trimethylsiloxy) methylsilyl-1-methylpropyl] -3, 4,5-trimethoxycinnamate, [3-bis (trimethylsiloxy) methylsilyl-3-methylpropyl] -3,4,5-trimethoxycinnamate, [3-bis (trimethylsiloxy) methylsilylpropyl] -3 , 4,5-trimethoxycinnamate, [3-bis (to Methylsiloxy) methylsilylbutyl] -3,4,5-trimethoxycinnamate, [3-tris (trimethylsiloxy) silylbutyl] -3,4,5-trimethoxycinnamate, [3-tris (trimethylsiloxy) silylbutyl ] 3,4,5-trimethoxycinnamate, [3-tris (trimethylsiloxy) silyl-1-methylpropyl] -3,4-dimethoxycinnamate and other silicone-based cinnamic acid UV absorbers; 2,4 -Dihydroxybenzophenone, 2,2'-dihydroxy-4-methoxybenzophenone, 2,2'-dihydroxy-4,4'-dimethoxybenzophenone, 2,2'4,4'-tetrahydroxybenzophenone, 2-hydroxy-4- Methoxybenzophenone, 2-hydroxy-4-methoxy-4′-me Rubenzophenone, 2-hydroxy-4-methoxybenzophenone-5-sulfonate, 4-phenylbenzophenone, 2-ethylhexyl-4′-phenyl-benzophenone-2-carboxylate, 2-hydroxy-4-n-octoxybenzophenone Benzophenone ultraviolet absorbers such as 4-hydroxy-3-carboxybenzophenone; 3- (4′-methylbenzylidene) -d, l-camphor, 3-benzylidene-d, l-camphor, urocanic acid ethyl ester, 2- Phenyl-5-methylbenzoxazole, 2,2′-hydroxy-5-methylphenylbenzotriazole, 2- (2′-hydroxy-5′-t-octylphenyl) benzotriazole, 2- (2′-hydroxy-) 5'-methylphenyl) benzotriazol , Dibenzalazine, dianisoylmethane, 4-methoxy-4′-t-butyldibenzoylmethane, 5- (3,3′dimethyl-2-norbornylidene) -3-pentan-2-one, etc .; Organic acids such as sarcosine acid (eg, lauroyl sarcosine sodium), glutathione, citric acid, malic acid, tartaric acid, lactic acid; vitamin A and its derivatives, vitamin B6 hydrochloride, vitamin B6 tripalmitate, vitamin B6 dioctanoate, vitamin B2 and its Derivatives, vitamin B such as vitamin B12, vitamin B15 and derivatives thereof, α-tocopherol, β-tocopherol, γ-tocopherol, vitamin E such as vitamin E acetate, vitamin D, vitamin H, pantothenic acid, panthetin, nicotine Acid amide, di Vitamins such as benzyltinate; γ-oryzanol, allantoin, glycyrrhizic acid (salt), glycyrrhetinic acid and derivatives thereof, tranexamic acid and derivatives thereof [tranexamic acid derivatives include tranexamic acid dimers (eg, trans- 4- (trans-aminomethylcyclohexanecarbonyl) aminomethylcyclohexanecarboxylic acid, etc.), esters of tranexamic acid and hydroquinone (for example, trans-4-aminomethylcyclohexanecarboxylic acid 4′-hydroxyphenyl ester, etc.), tranexamic acid And esters of gentisic acid (for example, 2- (trans-4-aminomethylcyclohexylcarbonyloxy) -5-hydroxybenzoic acid and its salts), amides of tranexamic acid (for example, (S-4-aminomethylcyclohexanecarboxylic acid methylamide and its salt, trans-4- (P-methoxyvinzoyl) aminomethylcyclohexanecarboxylic acid and its salt, trans-4-guanidinomethylcyclohexanecarboxylic acid and its salt, etc.) ), Saponins such as hinokitiol, bisabolol, eucalptone, thymol, inositol, psychosaponin, carrot saponin, hechimasaponin, muclodisaponin, pantothenyl ethyl ether, ethinyl estradiol, tranexamic acid, arbutin, cephalanthin, placenta extract, etc. Drugs: Barefoot, Clara, corn, orange, sage, yarrow, mallow, thyme, thyme, spruce, spruce, birch, horsetail, loofah, maronier, saxifrage Extracts of plants such as arnica, lily, mugwort, peonies, aloe, gardenia, sawara; pigments; porous and / or water-absorbing powders (eg starches derived from corn, potatoes, silicic acid, talc) , Powders of kaolin, aluminum magnesium silicate, calcium alginate, etc.); neutralizers; preservatives; fragrances; pigments and the like.

The manufacturing method of the W / O / W type emulsion composition of this invention is not specifically limited, For example, it can manufacture using a stirring and mixing apparatus as follows.
First, a uniform mixture is prepared by heating and mixing the oil phase component and the inner aqueous phase component. Next, in a state where the mixture of the oil phase components is stirred using a stirring and mixing device, the mixture of the inner aqueous phase components is gradually added to the mixture of the oil phase components and emulsified (primary emulsification step), A primary emulsion is prepared.

  A homogeneous mixture prepared by heating and mixing the outer aqueous phase components is prepared. Next, in a state where the mixture of the outer aqueous phase components is stirred using a stirring and mixing device, the primary emulsion is gradually added to the mixture of the outer aqueous phase components and emulsified (secondary emulsification step), A W / O / W type emulsion composition is prepared.

In the secondary emulsification step, a (W / O1 + O2) / W emulsion composition can be prepared by further adding a separately prepared mixture of oil phase components.
In this case, the higher alcohol can be added as an O1 component or an O2 component to form an α gel in the outer aqueous phase.

  Moreover, a (W / O1 + O2) / W type emulsion composition can also be prepared by mixing the W / O1 / W type emulsion composition and O2 / W type emulsion composition which were adjusted independently, respectively.

Although the average particle diameter of the W / O particles in the W / O / W emulsion composition of the present invention can be controlled by various methods, a method of controlling by the stirring conditions in the secondary emulsification step can be preferably exemplified.
In general, the larger the rotation speed of the stirring and mixing apparatus used in the secondary emulsification step and the longer the stirring time, the greater the load due to shear, collision and cavitation. To do. Therefore, the average particle size of the W / O particles of the W / O / W type emulsion composition of the present invention can be obtained by combining the stirring conditions such as the type of the stirring and mixing device, the number of rotations thereof, and the stirring time. The particle size range can be controlled.

  Examples of the stirring and mixing device include a high-speed emulsifying device such as a homodisper, a homomixer, a homogenizer, and a microfluidizer, a dispermixer having a sawtooth stirring blade, an impeller stirring device having a rotating blade, and the like. . Any of the stirring and mixing devices can produce a W / O / W type emulsion composition containing W / O particles having an average particle size specified in the present invention, but particularly high-speed emulsification represented by homodispers. It is preferable to use an apparatus.

Moreover, the W / O / W type emulsified composition of the present invention can also be produced by a membrane emulsification method using a porous membrane having a uniform pore size.
That is, it is also possible to prepare a liquid that becomes a dispersed phase by a method of press-fitting with nitrogen gas or the like into a liquid that becomes a continuous phase through a porous film.

  The W / O / W type emulsion composition of the present invention can be used as cosmetics such as milky lotion, cream, cosmetic liquid, sunscreen, liquid foundation, skin external preparation, quasi-drug, and pharmaceutical.

<Production Example 1>
The W / O / W type emulsion compositions of Examples 1 to 4 and Comparative Examples 1 and 2 were produced by the following method.
First, the O1 component and the W1 component shown in Table 1 were respectively heated and dissolved, and then the W1 component was gradually added to the O1 component while stirring to emulsify, and then cooled to prepare a W / O type primary emulsion.

  After the O2 component and the W2 component shown in Table 2 were dissolved by heating, the O1 component was gradually added to the W2 component with stirring and emulsified to prepare an O / W emulsion. By mixing this O / W type emulsion and the primary emulsion, the W / O / W type emulsion compositions of Examples 1 to 4 and Comparative Examples 1 to 3 ((W / O1 + 2) / W type emulsion composition) Prepared).

  Further, as a comparative example, an O / W type emulsion composition (Comparative Example 3) having a blending ratio shown in Table 2 was produced. The O / W type emulsion composition of Comparative Example 3 was produced by preparing an oil phase component and an aqueous phase component, and gradually adding the oil phase component to the aqueous phase component while stirring.

<Test Example 1>
20 panelists were allowed to apply the W / O / W emulsion compositions of Examples 1 to 4 and Comparative Examples 1 and 2 and the O / W emulsion composition of Comparative Example 3 to their skin, According to the evaluation criteria, moisturizing feeling and firmness were evaluated.
The results are shown in Table 2.
・ Moisturizing feeling ◎ ・ ・ ・ I feel a strong moisturizing feeling ○ ・ ・ ・ I feel a moisturizing feeling △ ・ ・ ・ I don't feel much moisturizing feeling ×… I don't feel a moisturizing feeling

・ A feeling of elasticity ◎ ・ ・ ・ I feel a strong elasticity ○… I feel a feeling of elasticity △… I don't feel a feeling of elasticity too much ×… I don't feel a feeling of elasticity

As shown in Table 2, the W / O / W type emulsified compositions of Examples 1 to 4 containing dimer dilinoleic acid di (isostearyl / phytosteryl) were used in the W / O / W emulsions of Comparative Examples 1 and 2 not containing the compound. It was found that compared to the O / W type emulsion composition, it was excellent in moisturizing feeling and firmness.
From this result, it was found that the W / O / W emulsion composition containing dimer linoleic acid di (isostearyl / phytosteryl) is excellent in moisturizing feeling and firmness in use.

Further, the W / O / W emulsion compositions of Examples 2 and 3 in which the content of dimerlinoleic acid di (isostearyl / phytosteryl) is 10% by mass or 14% by mass are sticky.
On the other hand, it was found that the W / O / W emulsion compositions of Examples 1 and 4 having a dimerlinoleic acid di (isostearyl / phytosteryl) content of 2% by mass or 5% by mass did not cause stickiness. It was.
From this result, the W / O / W type emulsion composition having a dimerinolinoleic acid di (isostearyl / phytosteryl) content of 2 to 5% by mass does not cause stickiness while having an excellent moisturizing feeling. I understood.

Moreover, the W / O / W type emulsion composition of Example 1 was compared with the O / W type emulsion composition of Comparative Example 3 in spite of the fact that the contained components and the content thereof were the same. It was found that the remarkably excellent moisturizing feeling and firmness were exhibited.
From this result, it was found that the improvement of moisturizing feeling and firmness due to the inclusion of dimerlinoleic acid di (isostearyl / phytosteryl) is particularly remarkable in the W / O / W emulsion composition.

<Production Example 2>
W / O / W type emulsion compositions having the blending ratios shown in Table 3 were produced in the same manner as in Production Example 1 (Examples 5 to 9).

<Test Example 2>
About the W / O / W type | mold emulsion composition of Examples 5-9 manufactured by manufacture example 2, it evaluated about richness and the goodness of elongation with the following method.
Twenty panelists applied the W / O / W emulsion compositions of Examples 5 to 9 in their containers to their skin. And according to the following evaluation criteria, 1 to 5 points regarding the rich feeling felt from the time of scooping up the W / O / W emulsion composition from the container to the initial stage of coating and the elongation from the middle to the final stage of coating The average value was taken.
And based on the evaluation result of a feeling of richness and good use feeling, the feeling of gap was evaluated.
The results are shown in Table 3.
・ Five points: 4 points with very strong feelings ... 3 points with strong feelings ... 2 points with strong feelings ... 1 point with weak feelings ... No rich feelings

・ Good elongation 5 points ・ ・ ・ Elongation is quite good 4 points ・ ・ ・ Elongation is good 3 points ・ ・ ・ Elongation is 2 points ・ ・ ・ Elongation is slightly bad 1 point ・ ・ ・ Elongation is quite bad

As shown in Table 3, the W / O / W type emulsion composition (Examples 5 to 7) having a W / O particle content of 16 mass% or 20 mass% has a W / O particle content of 10%. Compared with the mass% W / O / W emulsion composition (Examples 8 and 9), the body is remarkably strong and has excellent elongation. And it turned out that the W / O / W type | mold emulsion composition of Examples 5-7 has the unique usability | use_condition excellent in the gap feeling.
From this result, it is understood that the W / O / W type emulsion composition having a W / O particle content of 15% by mass or more has unique characteristics such as a rich feeling that is difficult to achieve at the same time and a good feeling in use. It was.
That is, when a W / O / W type emulsion composition having a W / O particle content of 15% by mass or more is applied to the skin, a moisturizing feeling and a firm feeling are felt when turning from a rich feeling to a good feeling of elongation. I can feel it.

  Moreover, when the W / O / W-type emulsion compositions of Example 5 and Example 7 in which the content of both W / O particles is 16% by mass are compared, the average particle diameter of the W / O particles is 2 μm. Compared to the W / O / W type emulsion composition of Example 7, the W / O / W type emulsion composition of Example 5 in which the average particle diameter of the W / O particles is 10 μm is more intense. It was found that the material has a good stretch feeling and a large gap.

<Test Example 3>
About the W / O / W type emulsified composition of Examples 5 to 9, the measurement surface was a Teflon cone-stainless steel disk type rheometer (T.A. Instruments AR500), temperature 20 ° C., oscillation. The storage elastic modulus (G ′) was measured while increasing the stress from 1 Pa under the conditions of measurement, gap 1 mm and 1 Hz. The results are shown in Table 4 and FIG.

  As shown in Table 4 and FIG. 3, the W / O / W type emulsion compositions of Examples 5 to 9 each have a storage elastic modulus G ′ of 2000 or more at a stress of 1 Pa.

Further, in the W / O / W type emulsion compositions of Examples 5 to 7, the storage elastic modulus G ′ hardly decreases in the stress range of 1 Pa to 80 Pa.
On the other hand, the W / O / W type emulsified compositions of Examples 8 and 9 are reduced by about 2300 Pa and about 700 Pa, respectively, in the stress range of 1 Pa to 80 Pa.

  In addition, the W / O / W type emulsion compositions of Examples 5 to 7 each had a storage elastic modulus G ′ from when a stress of about 100 Pa, about 120 Pa, and about 100 Pa was applied and while the stress further increased by 100 Pa. Are reduced by about 3600 Pa, about 8700 Pa, and about 3000 Pa, respectively.

From the above results, when the storage elastic modulus G ′ was measured while increasing the stress under the above conditions, the W / O / W type emulsified compositions of Examples 5 to 7 were (a) a range of stress of 1 Pa to 80 Pa. The amount of decrease in storage elastic modulus G ′ is 500 Pa or less, and (b) in the range of stress exceeding 80 Pa, the amount of decrease in storage elastic modulus G ′ with respect to the amount of increase in stress of 100 Pa is in the range of 2000 Pa or more. I understand.
When these results and the results in Table 3 are combined, the W / O / W emulsion composition satisfying the above (a) and (b) as a result of measurement with a rheometer has a strong body feeling and a good feeling of elongation. It can be seen that the gap is strong.
That is, when a W / O / W emulsion composition satisfying the above (a) and (b) is applied to the skin, a moisturizing feeling and a firm feeling can be felt when turning from a rich feeling to a good feeling of elongation. .

As described above, the W / O / W type emulsified compositions of Examples 5 to 7 each have a storage elastic modulus G ′ of 1 Pa to about 100 Pa, 1 Pa to about 120 Pa, and 1 Pa to about 100 Pa in the stress range. Almost no decline.
When this result and the result of Table 3 are combined, the greater the stress range in which the storage elastic modulus G ′ is hardly decreased, the stronger the richness felt in the initial stage of application of the W / O / W emulsion composition to the skin. , It can be seen that there is a tendency for the gap to become stronger.
In other words, the W / O / W emulsified composition with a large stress range in which the storage elastic modulus G ′ hardly decreases, when it turns from a rich feeling to a good feeling of elongation, it feels stronger and moisturized and firm. Can be made.

Further, in the W / O / W type emulsion compositions of Examples 5 to 7, the storage elastic modulus G ′ decreased by about 3600 Pa, about 8700 Pa, and about 3000 Pa, respectively, while the stress was applied to 100 Pa beyond the above range. doing.
When this result and the result of Table 3 are combined, it can be seen that the greater the decrease in the storage elastic modulus G ′ after exceeding the above range, the stronger the sense of richness.
That is, the W / O / W type emulsion composition having a large decrease in the storage elastic modulus G ′ after exceeding the above range has a stronger moisturizing feeling and firmness when it turns from a rich feeling to a good feeling of elongation. You can feel the feeling.

Table 4 shows numerical values (ΔX / ΔY) obtained by dividing the change amount of the storage elastic modulus G ′ by the change amount of the stress. As shown in Table 3, the W / O / W type emulsion compositions of Examples 5 to 7 have values of (ΔX / ΔY) of about −58, about −240, and about − in the stress range exceeding 80 Pa, respectively. There is a range of stresses of 78.
When this result and the result of Table 3 are combined, (c) W / O / W type emulsion composition in which the amount of decrease in storage elastic modulus G ′ relative to the amount of increase in stress is in the range of 50 Pa or more in the range of stress exceeding 80 Pa. It can be seen that the object has a strong sense of richness and a strong sense of gap.
That is, the W / O / W type emulsion composition that satisfies the above condition (c) has a strong gap feeling, so that it can be more strongly moisturized and firm.

  The results of Test Examples 1 and 2 show that the W / O / W type emulsion compositions of Examples 5 to 7 have an excellent rich feeling in the initial stage of application from before application, but rapidly from the middle to the end of application. This indicates that the moisturizing feeling and firmness are superior to the unique feeling of use, that is, the gap feeling, that the feeling of stretching spreads across the skin.

<Production Example 3>
W / O / W type emulsion compositions having the blending ratios shown in Table 5 were produced in the same manner as in Production Example 1 (Examples 10 to 17).

<Test Example 4>
The high temperature stability, moisturizing feeling and non-stickiness of the W / O / W type emulsion compositions of Examples 10 to 17 were evaluated by the following methods. The results are shown in Table 5.
High temperature stability The W / O / W emulsion compositions of Examples 10 to 17 were stored at 40 ° C., and the period of maintaining the W / O / W type observed before the start of the storage test was examined. .
-Moisturizing feeling and non-stickiness 20 panelists were allowed to apply the W / O / W emulsion compositions of Examples 10 to 17 to their skin. And according to the following evaluation criteria, the moisturizing feeling and the non-stickiness were scored, and the average value was taken.
5 points of moisturizing feeling 4 points to feel very good moisturizing feeling 3 points to feel good moisturizing feeling 2 points to feel moisturizing feeling 1 point to hardly feel moisturizing feeling・ Do not feel moisturizing

5 points without stickiness ... 4 points with no stickiness ... 3 points with little stickiness ... 2 points with slightly stickiness ... 1 point with stickiness ... very sticky

The W / O / W type emulsion compositions of Examples 10 to 17 contain a higher alcohol and a hydrophilic surfactant, and form an α gel in the outer aqueous phase.
And as shown in Table 5, all of the W / O / W type emulsified compositions of Examples 10 to 17 maintained the W / O / W type emulsified form at 40 ° C. for one month or longer. .
As a result, the W / O / W emulsion composition containing an α-gel formed by a hydrophilic surfactant and a higher alcohol in the outer aqueous phase has excellent moisture retention and firmness even after long-term storage at high temperatures. Shows that to maintain.

As shown in Table 5, the W / O / W emulsion composition of Example 17 can maintain the emulsion form for one month, while the W / O / W emulsion composition of Examples 10 to 16 is 40. The W / O / W type emulsified form was maintained at 3 ° C. for 3 months or more.
This result shows that the high-temperature stability of the W / O / W emulsion composition is improved by containing potassium stearate as the hydrophilic surfactant.
In other words, this result shows that by containing an ionic surfactant as a hydrophilic surfactant for the formation of α-gel, excellent moisturizing feeling even after storage at a high temperature for a longer period of time. It shows that it is possible to provide a W / O / W type emulsified composition that exhibits a firm feeling.

As shown in Table 5, the W / O / W type emulsified form should be maintained for 3 months or more as long as it is a form containing an ionic surfactant, no matter what kind of higher alcohol is used. Can do.
Moreover, compared with the W / O / W type | mold emulsion composition of Example 16 using lauryl alcohol (carbon number 12), Examples 10-12 using cetanol (carbon number 16) and behenyl alcohol (carbon number 22). The W / O / W emulsion composition is superior in stability at high temperatures. This result shows that it is more preferable to use a higher alcohol having 16 or more carbon atoms.

As shown in Table 5, the total content of higher alcohol is 2.6% by mass, compared with the W / O / W type emulsion composition of Example 13 in which the total content of higher alcohol is 1.3% by mass, The W / O / W type emulsion compositions of Examples 10 to 12 of 3.5% by mass and 2.4% by mass are excellent in high temperature stability and moisturizing feeling.
Further, compared with the W / O / W type emulsion composition of Example 11 in which the total content of higher alcohol is 3.5% by mass, Example 10 in which the total content of higher alcohol is 2.6% by mass is It is excellent in non-stickiness.
These results show that the W / O / W type emulsion composition having a higher alcohol content of 2 to 3% by mass has particularly excellent moisture retention and non-stickiness, and its characteristics are long-term storage at high temperatures. Shows that it is hard to be lost.

Further, Examples 10 to 12 in which the ratio of the total molar amount of the higher alcohol contained to the total molar amount of the hydrophilic surfactant is 3.1: 1, 4.2: 1, 2.7: 1. W / O / W type emulsion compositions of Examples 13-16, wherein the ratio is 1.6: 1, 1.8: 1, 1.5: 1, 5.8: 1. It is excellent in high-temperature stability as compared with a W-type emulsion composition.
This result shows that the W / O / W emulsion composition having a molar ratio of the higher alcohol to the hydrophilic surfactant of 2: 1 to 5: 1 is particularly excellent in high temperature stability. .

The present invention can be applied to cosmetics in the form of a W / O / W emulsifier.

Claims (5)

A W / O / W type emulsion composition containing dimer linoleic acid di (isostearyl / phytosteryl). The W / O / W type emulsion composition according to claim 1, comprising 1 to 10% by mass of the dimer linoleic acid di (isostearyl / phytosteryl). The outer aqueous phase contains an oil phase droplet that does not contain an aqueous phase, and the dimer dilinoleate (isostearyl / phytosteryl) is contained in an oil phase droplet that does not contain the aqueous phase. Or the W / O / W type emulsion composition of 2. The W / O / W type emulsion composition according to claim 1 or 2, wherein the content of the water-soluble polymer is 0.1% by mass or less. Cosmetics containing the W / O / W type emulsion composition as described in any one of Claims 1-4.