JP5228139B2 - Oil-in-water emulsified cosmetic - Google Patents

Description

Related applications

  This application claims the priority of Japanese Patent Application No. 2011-111783 filed on May 18, 2011, and is incorporated herein.

  The present invention relates to an oil-in-water emulsified cosmetic, and particularly relates to improvement of dispersion stability and usability of a powder to be blended.

Conventionally, cosmetics containing powders such as titanium oxide and zinc oxide have been widely used. As such cosmetics, oil-in-water emulsified cosmetics are suitably used because they have a fresh and refreshing feeling of use.
On the other hand, an oil-in-water emulsified cosmetic containing a hydrophobized powder obtained by hydrophobizing a powder surface such as titanium oxide or zinc oxide has been developed. Since the hydrophobized powder has high water resistance on the skin and good makeup lasting, by blending, it is possible to obtain a cosmetic that is excellent in the properties after application as well as the feeling during use.

In a system in which fine powder particles are dispersed in cosmetics together with such emulsified particles, obtaining a sufficient dispersion stability as a product is an issue.
In recent years, a dispersion obtained by dispersing a hydrophobized powder in an oil phase component in advance and treating it with a wet disperser such as a bead mill is treated with an aqueous phase and a homomixer to thereby improve the feeling of use and the powder after application to the skin. In-powder oil phase dispersion type oil-in-water emulsified cosmetics that are excellent in dispersibility, makeup and the like have been developed. In this system, it is extremely important to stably disperse the powder in the oil phase, and various dispersion stabilizers have been studied.
As the dispersion stabilizer, for example, polyoxyalkylene-modified polysiloxane, silicon glycerin at both ends, acrylic-modified silicone, amino-modified silicone and the like are known (see Patent Documents 1 to 5).

However, when polyoxyalkylene-modified polysiloxane or both-ends silicone glycerin is used, the dispersant itself is also a nonionic surfactant, and it is easy to phase inversion when the HLB balance is lost. The powder itself has amphiphilic properties and adversely affects the emulsion stability. Furthermore, when blending a plurality of powders, sufficient stability cannot be ensured.
On the other hand, when acrylic modified silicone is used, it does not have amphiphilic properties like the above polyoxyalkylene modified polysiloxane, and is relatively excellent in securing stability. However, the base odor caused by the remaining acrylic monomer is a big problem.
In addition, when amino-modified silicone is used, a plurality of powders can be blended and there is no base odor, but there is room for improvement in dispersion stability and usability when organic ultraviolet absorbers are blended in high amounts. .

Japanese Patent Laid-Open No. 2004-210698 JP 2005-247722 A JP 2006-8996 A JP 2007-8915 A JP 2009-209123 A

  The present invention has been made in view of the above-described problems of the prior art, and an object thereof is to provide an oil-in-water emulsified cosmetic excellent in powder dispersion stability and usability.

  As a result of diligent research by the present inventors to solve the above-mentioned problems, an oil phase component containing a silicone oil, a volatile hydrocarbon oil, an organic ultraviolet absorber, and a specific amino-modified silicone is previously added. Sufficiently disperse the powder, and then add an amphiphile of HLB5 or less to the resulting dispersion to mix and emulsify the oil phase with the aqueous phase. The present inventors have found that an oil-in-water emulsified cosmetic with excellent powder dispersibility can be obtained later, and completed the present invention.

That is, the oil-in-water emulsified cosmetic according to the present invention includes an aqueous phase, an oil phase dispersed in the aqueous phase, and a powder dispersed in the oil phase,
In the oil phase,
Silicone oil,
Volatile hydrocarbon oil,
An organic UV absorber,
A side chain amino-modified silicone having a functional group equivalent represented by the following general formula (1) of 1 to 10,000;
And an amphiphilic substance having an HLB of 5 or less.
(In General Formula (1), X is an alkyl group having 1 to 18 carbon atoms, R is an alkyl group having 1 to 6 carbon atoms, and R ′ is an alkyl group having 1 to 4 carbon atoms.)

In the oil-in-water emulsified cosmetic, the organic ultraviolet absorber is selected from octylmethoxycinnamate, octocrylene, hexyl diethylaminohydroxybenzoate, t-butylmethoxydibenzoylmethane, ethylhexyltriazone, bisethylhexyloxyphenol methoxyphenyltriazine It is suitable that it is 1 type or 2 types or more.
In the oil-in-water emulsified cosmetic, the volatile hydrocarbon oil is preferably a hydrocarbon oil having a boiling point at 1 atm of 300 ° C. or less.
In the oil-in-water emulsified cosmetic, it is preferable that the volatile hydrocarbon oil contains one or more selected from light isoparaffin, isododecane and isohexadecane.
In the oil-in-water emulsified cosmetic, it is preferable that the amount of the organic ultraviolet absorber is 0.1 to 10% by mass.
In the oil-in-water emulsified cosmetic, the blending mass ratio of the silicone oil and the volatile hydrocarbon oil is preferably 0.6: 1 to 9: 1.
In the oil-in-water emulsified cosmetic, it is preferable that the blending amount of the organic ultraviolet absorber is not more than 5 times the blending amount of the volatile hydrocarbon oil.
In the oil-in-water emulsified cosmetic, the amount of the side chain amino-modified silicone is preferably 1 to 5% by mass.
It is preferable that the oil-in-water emulsified cosmetic does not contain cetyl isooctanoate.
In the oil-in-water emulsified cosmetic, the water phase is selected from succinoglycan, xanthan gum, agar, hydrophobically modified polyether urethane, sodium acroyldimethyltaurate / hydroxyethyl acrylate copolymer, and acrylamide copolymer. It is preferred to include one or more thickeners.
In the oil-in-water emulsified cosmetic, it is preferable that the aqueous phase contains one or more emulsification aids selected from carboxymethyl cellulose, hydroxypropyl cellulose, hydroxyethyl cellulose, hydroxymethyl cellulose, and gelatin.

The method for producing an oil-in-water emulsified cosmetic according to the present invention includes a silicone oil, a volatile hydrocarbon oil, an organic ultraviolet absorber, and a functional group equivalent represented by the following general formula (1) having a functional group equivalent of 1 to 10,000. After blending the powder into an oil phase component containing a chain-type amino-modified silicone and dispersing the powder using a medium stirring mill, an amphiphilic substance of HLB5 or less is added to the obtained powder dispersion A water phase is added to the oil phase thus obtained, mixed and emulsified to obtain an oil-in-water emulsion cosmetic.
(In General Formula (1), X is an alkyl group having 1 to 18 carbon atoms, R is an alkyl group having 1 to 6 carbon atoms, and R ′ is an alkyl group having 1 to 4 carbon atoms.)

  The oil-in-water type emulsified cosmetic according to the present invention is obtained by sufficiently dispersing powder in an oil phase, using a volatile hydrocarbon oil, silicone oil, an oil phase containing an organic ultraviolet absorber, and a specific side chain type By using an amino-modified silicone and an amphiphilic substance, an oil-in-water emulsified cosmetic with excellent usability and powder dispersibility can be obtained.

It is the photograph at the time of adding a side chain type amino modification silicone to the oil phase containing an organic ultraviolet absorber.

The oil-in-water emulsified cosmetic according to the present invention includes an oil phase containing a specific component, a powder, and an aqueous phase.
Hereinafter, each compounding component is explained in full detail.

(Oil phase)
The oil phase needs to contain a silicone oil, a volatile hydrocarbon oil, an organic ultraviolet absorber, a specific side chain amino-modified silicone, and an amphiphilic substance having an HLB of 5 or less.

  Examples of the silicone oil include dimethylpolysiloxane, methylphenylpolysiloxane, methylhydrogenpolysiloxane, decamethylpolysiloxane, dodecamethylpolysiloxane, tetramethyltetrahydrogenpolysiloxane, cyclotetradimethylsiloxane, and cyclopentadimethylsiloxane. These include linear and cyclic polysiloxanes.

  The blending amount of the silicone oil is preferably 3 to 15% by mass and particularly preferably 5% by mass or more based on the total amount of the cosmetic. When there are too few compounding quantities, it may be inferior to a usability | use_condition. Moreover, it is particularly preferable that the blending amount of the silicone oil is 13% by mass or less.

A volatile hydrocarbon oil is a hydrocarbon oil having a boiling point of 300 ° C. or less at 1 atmosphere. Examples of the volatile hydrocarbon oil include light isoparaffin, isododecane, and isohexadecane.
Of these, it is preferable to use isododecane from the viewpoint of usability.

  The blending amount of the volatile hydrocarbon oil is preferably 1 to 10% by mass, and particularly preferably 1.5% by mass or more, based on the total amount of the cosmetic. If the amount is too small, the stability of the oil phase may be poor. Moreover, it is especially suitable that the compounding quantity of volatile hydrocarbon oil is 8 mass% or less. If the amount is too large, oiliness may appear.

  In the cosmetic of the present invention, the blending mass ratio of silicone oil and volatile hydrocarbon oil is preferably 0.6: 1 to 9: 1, and particularly preferably 3: 1 to 8: 1. It is. If the ratio of silicone oil is too large, the stability of the oil phase may be poor. When the ratio of volatile hydrocarbon oil is too large, the feeling of use may be inferior.

Examples of the organic ultraviolet absorber include octylmethoxycinnamate, octocrylene, hexyl diethylaminohydroxybenzoate, t-butylmethoxydibenzoylmethane, ethylhexyltriazone, bisethylhexyloxyphenol methoxyphenyltriazine, and the like.
Of these, octyl methoxycinnamate is preferably used.

  The blending amount of the organic ultraviolet absorber is preferably 0.1 to 10% by mass, particularly preferably 3.5% by mass or more, based on the total amount of the cosmetic. When there are too few compounding quantities, it may be inferior to the ultraviolet-ray prevention effect. Moreover, it is especially suitable that the compounding quantity of an organic ultraviolet absorber is 8 mass% or less. If the amount is too large, the stability of the oil phase may be poor.

  Moreover, it is suitable that the compounding quantity of an organic ultraviolet absorber is 5 times or less of the compounding quantity of volatile hydrocarbon oil, and it is especially suitable that it is 3 times or less. If the blending amount of the organic ultraviolet absorber is too large relative to the blending amount of the volatile hydrocarbon oil, the stability of the oil phase may be inferior.

  The side chain type amino-modified silicone which is a powder dispersant is a side chain type amino-modified silicone having a functional group equivalent represented by the following general formula (1) of 1 to 10,000.

In the general formula (1), X is an alkyl group having 1 to 18 carbon atoms, R is an alkyl group having 1 to 6 carbon atoms, and R ′ is an alkyl group having 1 to 4 carbon atoms.
The functional group equivalent of the side chain type amino-modified silicone (also referred to as diamine-modified silicone or amodimethicone) is 1 to 10,000, preferably 1500 to 3800. When the functional group equivalent exceeds 10,000, the dispersion becomes insufficient and the stability of the obtained emulsion is also lowered.

  The blending amount of the side chain type amino-modified silicone is preferably 1 to 5% by mass in the total amount of the cosmetic. If the amount of the side chain type amino-modified silicone is too small, the powder may aggregate and the dispersion may not be sufficient. Moreover, when there are too many compounding quantities, it may be inferior to the usability | use_condition at the time of application | coating.

As the amphiphilic substance having an HLB of 5 or less, those which can be usually blended in cosmetics can be used, and examples thereof include POE-modified siloxane and isostearic acid.
By blending such an amphiphilic substance, the interfacial tension can be lowered in order to improve the powder dispersion stability during and after emulsification, and the emulsion stability.

  The amount of the amphiphilic substance having an HLB of 5 or less is preferably 0.05 to 10% by mass, particularly preferably 0.1% by mass or more, based on the total amount of the cosmetic. If the amount is too small, the emulsion stability may not be sufficient. Further, it is particularly preferable that the amount of the amphiphilic substance having an HLB of 5 or less is 5% by mass or less. If the amount is too large, the feeling during use may be inferior or the phase may be changed to a water-in-oil type.

  In addition to the above essential components, the oil phase includes oils and fats, waxes, higher fatty acids, higher alcohols, synthetic ester oils, natural ester oils, hydrocarbon oils other than the above, etc., unless the effects of the present invention are impaired. Optional ingredients can be blended.

  Synthetic ester oils include, for example, isopropyl myristate, octyldodecyl myristate, isopropyl palmitate, butyl stearate, hexyl laurate, myristyl myristate, decyl oleate, hexyl decyl dimethyloctanoate, cetyl lactate, myristyl lactate, acetic acid Lanolin, isocetyl stearate, isocetyl isostearate, cholesteryl 12-hydroxystearate, ethylene glycol di-2-ethylhexanoate, dipentaerythritol fatty acid ester, N-alkyl glycol monoisostearate, neopentyl glycol dicaprate, dimalate malate Isostearyl, di-2-heptylundecanoic acid glycerin, tri-2-ethylhexanoic acid trimethylolpropane, triisostearic acid Methylolpropane, tetra-2-ethylhexanoic acid pentane erythritol, tri-2-ethylhexanoic acid glycerin, triisostearic acid trimethylolpropane, cetyl 2-ethylhexanoate, 2-ethylhexyl palmitate, trimyristic acid glycerin, tri- 2-Heptylundecanoic acid glyceride, castor oil fatty acid methyl ester, oleyl oleate, cetostearyl alcohol, acetoglyceride, 2-heptylundecyl palmitate, diisobutyl adipate, N-lauroyl-L-glutamic acid-2-octyldodecyl, adipic acid Di-2-heptylundecyl, ethyl laurate, di-2-ethylhexyl sebacate, 2-hexyldecyl myristate, 2-hexyldecyl palmitate, adipine 2-hexyl decyl, sebacic acid diisopropyl, 2-ethylhexyl succinate, ethyl acetate, butyl acetate, amyl acetate, and triethyl citrate.

  Examples of natural ester 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, flaxseed Oil, safflower oil, cottonseed oil, eno oil, soybean oil, peanut oil, tea seed oil, kaya oil, rice bran oil, cinnagari oil, jojoba oil, germ oil, triglycerin, trioctanoic acid glycerin, triisopalmitic acid glycerin, etc. Can be mentioned.

(powder)
As the powder dispersed in the oil phase, a powder that can be usually blended in cosmetics can be used. Examples of the powder include titanium oxide, zinc oxide, talc, mica, sericite, kaolin, mica titanium, black iron oxide, yellow iron oxide, bengara, ultramarine, bitumen, chromium oxide, chromium hydroxide, silica, cerium oxide. Etc.

The powder dispersed in the oil phase may be an untreated powder or a hydrophobized powder. Among these, in consideration of dispersibility, cosmetic durability, etc., it is preferable to hydrophobize the powder surface.
As a specific method of hydrophobizing treatment, the surface of the powder is made of methylhydrogenpolysiloxane, dimethylpolysiloxane, silicones such as alkyl-modified silicone resin, dextrin fatty acid ester, higher fatty acid, higher alcohol, fatty acid ester, metal Hydrophobized with soap, alkyl phosphate ether, fluorine compound, or hydrocarbons such as squalane, paraffin, etc., by a wet method using a solvent, a gas phase method, a mechanochemical method, etc., and its average particle size Is preferably smaller than the emulsified particles in the oil phase.

  The blending amount of the powder varies depending on the product form, but in the case of foundation, it is preferably 8 to 60% by mass, and in the case of sunscreen, it is preferably 10 to 35% by mass.

(Water phase)
In the aqueous phase, an aqueous component that can be usually blended in cosmetics can be used as long as the stability of the emulsion is not impaired.

In the aqueous phase, one or more kinds selected from succinoglycan, xanthan gum, acrylamide copolymer, acryloyldimethyltaurine sodium / hydroxyethyl acrylate copolymer, agar, and hydrophobic polyether urethane are used. It is preferable to blend a sticky agent.
It is preferable that the compounding quantity of a thickener is 0.1-3 mass% with respect to cosmetics whole quantity. If the blending amount is too small, the stability may not be sufficient, and if the blending amount is too large, the feeling of use may be deteriorated, such as warping.

Moreover, it is also suitable to mix | blend the 1 type (s) or 2 or more types of emulsification adjuvant selected from a carboxymethylcellulose, a hydroxyethylcellulose, a hydroxymethylcellulose, a hydroxypropyl cellulose, and gelatin in an aqueous phase.
It is preferable that the compounding quantity of an emulsification adjuvant is 0.1-1 mass% with respect to cosmetics whole quantity. If the blending amount is too small, the temperature stability of the emulsion and the dispersion stability of the powder may not be sufficient, and if the blending amount is too large, the usability may be deteriorated.

In addition, in order to improve the feeling of use and the beauty of the finish, it is also possible to blend powder in the aqueous phase as long as the stability is not impaired. A hydrophilic powder is suitable as the powder to be blended.
Examples of the hydrophilic powder include silica, mica, talc, sericite, kaolin, synthetic fluorine phlogopite, dicalcium phosphate, organic resin powder subjected to hydrophilization, and organic resin powder introduced with a hydrophilic group. .

In addition, examples of humectants that can be incorporated into the aqueous phase include polyhydric alcohols such as glycerin, diethylene glycol, butylene glycol, and polyethylene glycol, proteins such as amino acids, nucleic acids, collagen, and elastin, mucopolysaccharides such as hyaluronic acid and chondroitin sulfate, and the like. Is mentioned.
Examples of the sequestering agent include sodium edetate, sodium metaphosphate, phosphoric acid and the like.

  Examples of water-soluble polymers include plant polymers such as gum arabic, carrageenan, pectin, quince seed (quince), starch, and alge colloid (brown algae extract), microbial polymers such as dextran and pullulan, casein, and gelatin. Animal polymer, starch polymer such as carboxymethyl starch and methylhydroxypropyl starch, alginic acid polymer such as sodium alginate, vinyl polymer such as carboxyvinyl polymer, polyoxyethylene polymer, polyoxyethylene polymer Examples thereof include oxypropylene copolymer-based polymers, acrylic polymers such as sodium polyacrylate, and inorganic water-soluble polymers such as bentonite, aluminum magnesium silicate, and laponite.

The drugs include vitamin A oil, retinol, retinol palmitate, inosit, pyridoxine hydrochloride, benzyl nicotinate, nicotinamide, nicotinic acid dl-α-tocopherol, ascorbic acid magnesium phosphate, ascorbic acid 2-glucoside, vitamin D2 ( Ergocassipherol), dl-α-tocopherol 2-L potassium ascorbate diester potassium salt, dl-α-tocopherol, acetic acid dl-α-tocopherol, pantothenic acid, vitamins such as biotin, anti-inflammatory such as allantoin and azulene Agents, whitening agents such as arbutin, astringents such as zinc oxide and tannic acid, sulfur, lysozyme chloride, pyridoxine hydrochloride, γ-oryzanol and the like.
In addition to the above drugs being used in a free state, those capable of salt formation can be used in the form of an acid or base salt, and those having a carboxylic acid group can be used in the form of its ester.

  In the oil-in-water emulsified cosmetic according to the present invention, as the emulsifier, an emulsifier that can be usually blended in the cosmetic can be used. In the present invention, it is preferable to use a hydrophilic surfactant because it has low solubility in the oil phase and good temperature stability. Moreover, it is particularly preferable to use an emulsifier composed of one or more total HLBs of 10 or more.

Examples of hydrophilic surfactants include glycerin or polyglycerin fatty acid esters, propylene glycol fatty acid esters, POE sorbitan fatty acid esters, POE sorbit fatty acid esters, POE glycerin fatty acid esters, POE fatty acid esters, and POE alkyl ethers. , POE alkylphenyl ethers, POE / POP alkyl ethers, POE castor oil or hydrogenated castor oil derivatives, POE beeswax / lanolin derivatives, alkanolamides, POE propylene glycol fatty acid esters, POE alkylamine, POE fatty acid amide, etc. Is mentioned.
It is preferable that the compounding quantity of an emulsifier is 0.5-5 mass% in cosmetics whole quantity.

  In the oil-in-water emulsified cosmetic of the present invention, other various components usually used in cosmetics, for example, organic powders, pH adjusters, antioxidants, antiseptics, antibacterial agents, as long as the effects are not impaired , Neutralizing agents, plant extracts, fragrances, pigments and the like can be blended.

Examples of the organic powder include nylon powder, polyethylene powder, polymethylsilsesquioxane powder, silicone elastomer powder, and acrylic resin powder.
Examples of the pH adjuster include lactic acid, citric acid, sodium citrate, glycolic acid, succinic acid, tartaric acid, dl-malic acid, potassium carbonate, sodium hydrogen carbonate, ammonium hydrogen carbonate and the like.
Examples of the antioxidant include ascorbic acid, α-tocopherol, dibutylhydroxytoluene, butylhydroxyanisole and the like.
Examples of antiseptics and antibacterial agents include paraoxybenzoic acid esters, phenoxyethanol, benzoic acid, salicylic acid, carboxylic acid, sorbic acid, parachloromethcresol, hexachlorophene, benzalkonium chloride, chlorhexidine chloride, trichlorocarbanilide, and photosensitizer. Etc.

  The product form of the oil-in-water emulsified cosmetic of the present invention is arbitrary and can be used as a foundation, sunscreen, makeup base, emulsion, cream and the like.

The oil-in-water emulsified cosmetic according to the present invention is prepared by blending powder and a dispersant for the powder into the specific oil, and finely pulverizing the powder with a medium stirring mill such as a bead mill, Thereafter, an oil phase obtained by adding an amphiphile of HLB 5 or less to the obtained powder dispersion can be produced by mixing and emulsifying with an aqueous phase with a homomixer or the like.
In the oil-in-water emulsified cosmetic of the present invention, the powder is dispersed in a state in which the secondary aggregates are sufficiently crushed in the emulsified and dispersed oil phase. It is good, and the dispersion state of the powder on the skin after application is also good.

  In addition, when a powder having a particle size larger than the emulsified particle size (emulsified oil droplet size) is present during production, a part of the powder is transferred from the emulsified oil phase to the aqueous phase by the homomixer treatment. Since an aggregate is formed, the average particle size of the powder is preferably smaller than the average particle size of the emulsified particles that are the oil phase. For example, when using a bead mill, it is preferable to increase the residence time of the dispersion in the mill, that is, to increase the number of passes to sufficiently reduce the particle size of the crushed powder and obtain a crushed powder sufficiently smaller than the emulsified particle size. is there.

The present invention will be described in more detail with reference to the following examples, but the present invention is not limited thereto. Unless otherwise specified, the blending amount is expressed in mass% with respect to the system in which the component is blended.
Prior to the description of the examples, the evaluation method of the test used in the present invention will be described.

Evaluation (1): Appearance A sample was placed in a 50 ml sample tube (diameter 3 cm), rotated at room temperature for 4 hours at a speed of 45 rpm, a rolling test was performed, and the degree of powder aggregation was visually observed.
A: Color stripes were not observed.
B: Slight color fringing was observed.
C: A considerable amount of color fringing was observed.

Evaluation (2): Oil phase stability An oil phase was prepared, and phase separation of the oil phase was visually observed.
A ^* : Phase separation was not observed.
A: A slight phase separation was observed.
B: Phase separation was observed.
C: Phase separation was clearly observed.

Evaluation (3): Usability (freshness)
Ten specialist panels applied the sample to the face and evaluated the feeling after use.
A ^* : More than 9 panelists answered that the rest was refreshing.
A: A panel of 7 or more and less than 9 responded that the rest was refreshing.
B: A panel of 5 or more and less than 7 responded that the rest would be refreshed.
C: A panel of less than 5 responded that the rest would be refreshed.

  First, the inventors changed the type of the oil phase component, and manufactured an oil-in-water emulsified cosmetic having the composition shown in Table 1 below by the following manufacturing method. And each sample was evaluated on the above-mentioned scoring standard about evaluation item (1). The results are shown in Table 1.

(Production method)
Powder is added to and mixed with the oil phase component (excluding the emulsification aid) containing the dispersant, and the mixture is processed in a bead mill with five passes to fully disperse the powder. The emulsification aid component was added as necessary, and stirred to create an oil phase part. The oil-in-water emulsified cosmetic was obtained by gradually adding the obtained oil phase parts to an aqueous phase composed of an aqueous phase component uniformly mixed in advance while applying a homomixer.

* 1: KF-8004 (manufactured by Shin-Etsu Chemical Co., Ltd.)

From Table 1, the sample of Test Example 1-1 in which the powder was dispersed in the oil phase by using the side chain type amino-modified silicone as the dispersant did not cause aggregation of the powder.
However, in the sample of Test Example 1-2 in which the squalane of Test Example 1-1 was replaced with octylmethoxycinnamate, which is an organic ultraviolet absorber, powder aggregation was observed.

Therefore, the stability of the oil phase when the composition of only the oil phase component was changed was examined. The present inventors evaluated each sample that was allowed to stand after mixing the oil phase components having the composition shown in Table 2 below with a homomixer, based on the above scoring criteria for the evaluation item (2). The results are shown in Table 2.
Moreover, the photograph which image | photographed the sample of Test Example 2-3, 2-4 is shown to (a) and (b) of FIG. 1, respectively. And the photograph which image | photographed the sample of Test Example 2-1 and 2-2 which added the side chain type amino modified silicone to the sample of Test Example 2-3, 2-4 is respectively shown to (a) ', (b of FIG. ) '. This photo was taken with the sample placed on a black desk.
In addition, the compounding quantity in following Table 2 has shown by the mass part with respect to the type | system | group with which the component is mix | blended.

According to Test Example 1-1 ′, the sample containing the side chain type amino-modified silicone and not containing the organic ultraviolet absorber was excellent in stability.
According to Test Examples 1-2 ′, 2-1, and 2-2, it can be seen that in the oil phase in which the side chain type amino-modified silicone is blended, the stability is deteriorated as the blending amount of the organic ultraviolet absorber is increased.
From Tables 1 and 2, it is clear that in oil-in-water emulsified cosmetics, when the stability of the oil phase deteriorates, the oil-in-water emulsified cosmetics containing the oil phase cause powder aggregation and adversely affect the stability. Became.

In addition, according to Test Examples 2-3 and 2-4, when the side chain type amino-modified silicone was not blended, the stability was excellent even when the organic ultraviolet absorber was blended in a high amount.
Therefore, the oil component necessary for stably blending the organic UV absorber into the oil phase component blended with the side chain amino-modified silicone necessary as a dispersant for dispersing the powder in the oil phase was investigated. It was.
The inventors of the present invention evaluated each sample that was allowed to stand after mixing the oil phase components having the composition shown in Table 3 below with a homomixer, based on the above scoring criteria for the evaluation item (2). Moreover, the oil-in-water emulsion cosmetic was manufactured with the said manufacturing method using the oil-phase component shown in following Table 3, and the powder of the mixing | blending composition of Test Example 1-2, the water phase, and the emulsifier. And each sample was evaluated by the said scoring standard about evaluation item (3). The results are shown in Table 3.

From Table 3, it was found that the stability of the oil phase was improved by substituting a portion of the silicone oil of the sample of Test Example 2-2 with a hydrocarbon oil such as light isoparaffin, isododecane, and isohexadecane.
However, according to Test Examples 3-4 to 3-6, it was found that when a non-volatile hydrocarbon oil was added to the oil phase, the usability deteriorated when an oil-in-water emulsion cosmetic was prepared.
For this reason, an oil-in-water type emulsion-in-water emulsified cosmetic using a side-chain amino-modified silicone as a dispersant according to the present invention comprises a silicone oil, a volatile hydrocarbon oil, and an organic ultraviolet absorber in the oil phase. It is necessary to include.

  Next, the present inventors examined the blending ratio of silicone oil and volatile hydrocarbon oil in the oil phase. The inventors of the present invention evaluated each sample that was allowed to stand after mixing the oil phase components having the composition shown in Table 4 below with a homomixer, based on the above scoring criteria for the evaluation item (2). Moreover, the oil-in-water emulsion cosmetic was manufactured with the said manufacturing method using the oil phase component shown in following Table 4, the powder of the mixing | blending composition of Test Example 1-2, an aqueous phase, and an emulsifier. And each sample was evaluated by the said scoring standard about evaluation item (3). The results are shown in Table 4.

From Table 4, it can be seen that when the blending mass ratio of silicone oil is too large, the oil phase stability cannot be obtained, and when the blending mass ratio of volatile hydrocarbon oil is too large, the usability is deteriorated.
Therefore, in the oil-in-water emulsified cosmetic according to the present invention, the blending mass ratio of the silicone oil and the volatile hydrocarbon oil is preferably 0.6: 1 to 9: 1.

  Next, the present inventors examined the kind of organic ultraviolet absorber. The present inventors evaluated each sample that was allowed to stand after mixing the oil phase components having the blending composition shown in Table 5 below with a homomixer according to the above scoring criteria for the evaluation item (2). In addition, an oil-in-water emulsified cosmetic was produced by the above production method using the oil phase components shown in Table 5 below and the powder, water phase, and emulsifier of the composition of Test Example 1-2. And each sample was evaluated by the said scoring standard about evaluation item (3). The results are shown in Table 5.

From Table 5, the samples of Test Examples 5-1 to 5-5 in which various organic ultraviolet absorbers were blended with the oil-in-water emulsion cosmetic according to the present invention were excellent in oil phase stability and usability.
Therefore, in the oil-in-water emulsified cosmetic according to the present invention, as the organic ultraviolet absorber to be blended, in addition to octylmethoxycinnamate, octocrylene, hexyl diethylaminohydroxybenzoate, t-butylmethoxydibenzoylmethane, ethylhexyltriazone Bisethylhexyloxyphenol methoxyphenyl triazine is preferred.
In consideration of oil phase stability and usability, it is particularly preferable to blend octyl methoxycinnamate as the organic ultraviolet absorber.

Claims (11)

An aqueous phase, an oil phase dispersed in the aqueous phase, and a powder dispersed in the oil phase,
In the oil phase,
Silicone oil,
Volatile hydrocarbon oil,
An organic UV absorber,
A side chain amino-modified silicone having a functional group equivalent represented by the following general formula (1) of 1 to 10,000;
HLB5 and following of the amphiphilic substance, only including,
An oil- in-water emulsified cosmetic, wherein the blending mass ratio of silicone oil: volatile hydrocarbon oil is 0.6: 1 to 9: 1 .
(In General Formula (1), X is an alkyl group having 1 to 18 carbon atoms, R is an alkyl group having 1 to 6 carbon atoms, and R ′ is an alkyl group having 1 to 4 carbon atoms.)   The oil-in-water emulsion cosmetic according to claim 1, wherein the organic ultraviolet absorber is octylmethoxycinnamate, octocrylene, hexyl diethylaminohydroxybenzoate, t-butylmethoxydibenzoylmethane, ethylhexyltriazone, bisethylhexyloxyphenol methoxyphenyl. An oil-in-water emulsified cosmetic, characterized by being one or more selected from triazines.   3. The oil-in-water emulsified cosmetic according to claim 1 or 2, wherein the volatile hydrocarbon oil is a hydrocarbon oil having a boiling point at 1 atm of 300 ° C. or less.   The oil-in-water emulsified cosmetic according to any one of claims 1 to 3, wherein the volatile hydrocarbon oil contains one or more selected from light isoparaffin, isododecane and isohexadecane. Oil emulsified cosmetic.   The oil-in-water emulsified cosmetic according to any one of claims 1 to 4, wherein the organic ultraviolet absorber is blended in an amount of 0.1 to 10% by mass. The oil-in-water type emulsion cosmetic according to any one of claims 1 to 5 , wherein the blending amount of the organic ultraviolet absorber is not more than 5 times the blending amount of the volatile hydrocarbon oil. Emulsified cosmetic. The oil-in-water emulsion cosmetic according to any one of claims 1 to 6 , wherein the amount of the side chain amino-modified silicone is 1 to 5% by mass. The oil-in-water emulsion cosmetic according to any one of claims 1 to 7, wherein the oil-in-water emulsion cosmetic does not contain cetyl isooctanoate. The oil-in-water emulsion cosmetic according to any one of claims 1 to 8 , wherein the aqueous phase comprises succinoglycan, xanthan gum, agar, hydrophobically modified polyether urethane, acroyldimethyltaurine sodium / hydroxyethyl acrylate copolymer An oil-in-water emulsified cosmetic comprising one or more thickeners selected from acrylamide copolymers. The oil-in-water emulsified cosmetic according to any one of claims 1 to 9 , wherein the aqueous phase contains one or more emulsification aids selected from carboxymethyl cellulose, hydroxypropyl cellulose, hydroxyethyl cellulose, hydroxymethyl cellulose, and gelatin. An oil-in-water emulsified cosmetic comprising an agent. Silicone oil and volatile hydrocarbon oil ( wherein the blending mass ratio of silicone oil: volatile hydrocarbon oil is 0.6: 1 to 9: 1 ), an organic ultraviolet absorber, and the following general formula (1) Obtained after blending the powder into an oil phase component containing a side chain amino-modified silicone having a functional group equivalent of 1 to 10,000 and dispersing the powder using a medium stirring mill Oil-in-water emulsification characterized in that an oil phase obtained by adding an amphiphile of HLB 5 or less to a powder dispersion is mixed with an aqueous phase and emulsified to obtain an oil-in-water emulsified cosmetic. A method for producing cosmetics.
(In General Formula (1), X is an alkyl group having 1 to 18 carbon atoms, R is an alkyl group having 1 to 6 carbon atoms, and R ′ is an alkyl group having 1 to 4 carbon atoms.)