HK1141712B - Oil-in-water emulsion composition and method for producing the same - Google Patents

Description

Oil-in-water type emulsion composition and method for producing the same

RELATED APPLICATIONS

This application claims priority from Japanese patent application 2007-116809 filed on 26.4.2007, and is incorporated herein by reference.

Technical Field

The present invention relates to an oil-in-water emulsion composition, and more particularly, to an oil-in-water emulsion composition which is excellent in emulsion stability and contains almost no surfactant, and a method for producing the same.

Background

An oil-in-water emulsion used in cosmetics and the like stably mixes an aqueous component and an oily component by emulsification with an added surfactant.

On the other hand, with the increase in consumers who place more importance on safety in recent years, there is an increasing demand for oil-in-water emulsions in which highly allergic users do not contain or give such an amount of a surfactant that is not likely to be irritating.

An emulsion prepared by adsorbing a powder on the surface without using a surfactant is known as a pickering emulsion (pickering emulsion). Many studies have been reported on the adjustment of pickering emulsions (for example, non-patent document 1), and it is also proposed to apply the emulsions in the field of cosmetics (patent documents 1 and 2).

In recent years, a stable oil-in-water type emulsion composition is obtained by emulsifying an oil phase containing an amphiphilic material such as ceramide by using a specific cationic surfactant and a polyhydric alcohol in combination (see patent document 3).

Patent document 1: japanese patent No. 2656226

Patent document 2: japanese Kohyo publication No. 2001-518111

Patent document 3: japanese unexamined patent publication No. 2006-36763

Non-patent document 1: B.Binks et al, Advances in Colloid and interface science 100-

Disclosure of Invention

However, it is very difficult to prepare an oil-in-water type pickering emulsion which can satisfy stability against temperature and stirring in various environments, which is required when the emulsion is used in a cosmetic.

Further, in patent document 3, an amphiphilic substance is essential, and stabilization of the system is achieved by forming a liquid crystal structure (α gel) with a surfactant, but the system tends to be sticky in terms of usability. In order to obtain a Pickering emulsion, a technique of incorporating an amphiphilic substance in a trace amount has been reported so far (for example, Mukul M, Sharma et al, Journal of Colloid and interface science 157, 244. sup. 253, (1993)), but it is difficult to obtain a product satisfying sufficient stability as a cosmetic, and there is also a problem of a new feeling of use such as greasiness of a preparation due to an amphiphilic substance.

The present invention has been made in view of the above circumstances, and an object thereof is to provide an oil-in-water emulsion composition having excellent emulsion stability, less greasy feeling, and low skin irritation, and a simple method for producing the same.

As a result of intensive studies to achieve the above object, the present inventors have found that an oil-in-water emulsion having a specific structure formed from a powder, an oil phase component, an aqueous phase component, and a cationic surfactant containing a 2-chain alkyl group having a chain length within a certain range, which are blended in specific amounts, has excellent emulsion stability, is free from greasy feeling, and has low irritation, and have completed the present invention.

The present inventors have also found that the oil-in-water type emulsion composition can be easily obtained by combining the cationic surfactant treatment to the powder in the preparation process of the emulsion composition without separately treating the powder.

That is, a first aspect of the present invention is an oil-in-water emulsion composition comprising (a)1 to 20% by mass of a powder component, (b)0.001 to 0.5% by mass of a cationic surfactant having 2 alkyl chains with carbon chains of 12 to 22, (c) an oil phase component, and (d) an aqueous phase component, wherein the powder particles of (a) have a structure in which they are adsorbed on oil droplets dispersed in an aqueous phase, and wherein substantially no surfactant is contained other than the cationic surfactant of (b).

The oil-in-water emulsion composition is characterized in that the cationic surfactant (b) is adsorbed on the powder particles (a).

The oil-in-water emulsion composition is characterized in that the total amount of the cationic surfactant (b) is 0.001 to 0.1% by mass.

The cationic surfactant of the oil-in-water emulsion composition (b) is preferably dimethyldialkylammonium chloride.

The oil-in-water emulsion composition preferably contains 1 or 2 or more kinds selected from succinoglycan, xanthan gum and acrylamide as the aqueous phase component of (d).

The method for producing the oil-in-water emulsion composition is characterized by comprising the following steps (A) and (B),

(A) a step of dispersing a powder component and a cationic surfactant having 2 alkyl chains with carbon chains of 12 to 22 inclusive in an aqueous phase component,

(B) And (A) mixing the dispersion with an oil phase component.

A second aspect of the present invention is an external skin preparation for sunscreen, comprising the oil-in-water emulsion composition described above, and further comprising a hydrophobized powder dispersed in the oil phase component of (c).

The external preparation for skin for sun-screening preferably contains substantially no water-soluble surfactant other than the cationic surfactant (b).

The external skin preparation for sunscreen preferably contains hydrophobized fine particulate titanium dioxide and/or hydrophobized fine particulate zinc oxide as the hydrophobized powder.

A third aspect of the present invention is a cosmetic composition comprising the oil-in-water emulsion composition, and further comprising a hydrophobized powder dispersed in the oil phase component of (c), wherein 50% by mass or more of the oil phase component is a silicone oil.

The cosmetic composition preferably contains substantially no water-soluble surfactant other than the cationic surfactant of (b).

The cosmetic composition preferably contains 1 or 2 or more kinds selected from hydrophobized fine particles of titanium dioxide, red iron oxide, yellow iron oxide, black iron oxide, and aluminum oxide as the hydrophobized powder.

Further, the cosmetic composition preferably contains 1 or 2 or more kinds of silicone acrylates represented by the following general formula (I).

(formula 1)

(wherein R is an alkyl group having 10 to 20 carbon atoms, a + b + c is 1, a, b and c are each 0.2 or more, and d is an integer of 5 to 100.)

The cosmetic composition preferably contains 1 or 2 or more kinds of both-terminal silicone-modified glycerin represented by the following general formula (II).

(formula 2)

(in the formula, R1 represents a C1-12 linear or branched alkyl group or a phenyl group, R2 represents a C2-11 alkylene group, m represents 10-120, and n represents 1-11.)

The fourth aspect of the present invention is a hair cosmetic for styling, which comprises the oil-in-water emulsion composition, wherein the oil-phase component of (c) of the oil-in-water emulsion composition contains 1 to 30% by mass of a solid oil component and 1 to 30% by mass of a liquid oil component.

The hair cosmetic for permanent set preferably contains substantially no water-soluble surfactant other than the cationic surfactant (b).

The hair cosmetic for permanent set preferably contains silicon oxide as a powder component of (a).

According to the present invention, an oil-in-water emulsion composition having excellent emulsion stability can be easily obtained. Further, by blending the above composition, an oil-in-water sunscreen skin external preparation, an oil-in-water cosmetic composition, and a hair cosmetic for styling, which have high functionality, can be obtained.

Drawings

FIG. 1 is a phase diagram of dialkylmethylammonium chloride in a two-component system with water.

FIG. 2 shows a process for producing a silica-coated titanium oxide by changing the amount of dimethyl dioctadecyl ammonium chloride: 3 wt%, oil content: 47 wt%, water: the zeta potential measurement results of the silica-coated titanium oxide powder dispersed in water together with dimethyldioctadecylammonium chloride for the remaining oil-in-water emulsion composition are shown in the figure.

Detailed Description

The best mode of the present invention will be described below.

First, an oil-in-water type emulsion composition according to a first embodiment of the present invention will be described.

The oil-in-water emulsion composition of the present invention contains a specific amount of a cationic surfactant containing a 2-chain alkyl group having a chain length within a certain range, in addition to an oil phase, an aqueous phase and a powder component which are components of a conventional pickering emulsion.

(2-chain cationic surfactant)

The alkyl chain of the 2-chain cationic surfactant of the present invention may be a straight chain or a branched chain, or may be different. Examples of the 2-chain type cation contained in the oil-in-water emulsion of the present invention include dimethyldidodecylammonium chloride, diethyldidodecylammonium chloride, dipropyldidodecylammonium chloride, dimethyldihexadecylammonium chloride, diethyldihexadecylammonium chloride, dipropyldihexadecylammonium chloride, dimethyldicetylammonium chloride, diethyldicetylammonium chloride, dipropyldicetylammonium chloride, dimethyldioctadecylammonium chloride, diethyldioctadecylammonium chloride, dipropyldioctadecylammonium chloride, dimethyldidicosylammonium chloride, diethyldidicosylammonium chloride, dipropyldidocosylammonium chloride, distearoylethylammonium dichloride, dipalmitoylethyldiammonium chloride, Distearoylethylhydroxyethylmethylammonium methylsulfate, dipalmitoylethylhydroxyethylmethylammonium methylsulfate, and the like.

The chain length of the alkyl group of the 2-chain cationic surfactant in the oil-in-water emulsion composition of the present invention is preferably 12 to 22. When the amount is less than 12, the emulsifying power and the emulsifying stability are problematic, and when the amount is more than 22, the feeling of greasiness is increased, which causes a problem in handling. The chain length of the alkyl group of the 2-chain cationic surfactant is more preferably 16 to 20. The 2-chain type cationic surfactant in the oil-in-water emulsion composition of the present invention is preferably dimethyldialkylammonium chloride.

The amount of the 2-chain cationic surfactant to be incorporated in the oil-in-water emulsion composition of the present invention is 0.001 to 0.5% by mass, preferably 0.001 to 0.1% by mass, based on the total amount of the emulsion. When the amount of the 2-chain cationic surfactant is too large, the composition becomes an α -gel, and the composition tends to be greasy and to have a reduced feeling in use.

In general, the surfactant of the above-mentioned blending amount is only a trace amount to exert a function as an emulsifier in the emulsion composition, but exhibits an extremely excellent emulsion stabilizing effect in the pickering emulsion having the structure of the present invention. In addition, the irritation was also extremely low.

(powder component)

Examples of the powder component contained in the oil-in-water emulsion composition of the present invention include inorganic powders (for example, talc, kaolin, mica, sericite (serite), muscovite, phlogopite, synthetic mica, lepidolite, biotite, vermiculite, magnesium carbonate, calcium carbonate, aluminum silicate, barium silicate, calcium silicate, magnesium silicate, strontium silicate, metal tungstate, magnesium, silica, zeolite, barium sulfate, calcined calcium sulfate (calcined gypsum), calcium phosphate, fluorapatite, hydroxyapatite, ceramic powder, etc.), metal soaps (for example, zinc myristate, calcium palmitate, aluminum stearate), boron nitride, etc.); organic powders (e.g., titanium dioxide, zinc oxide, etc.); inorganic red pigments (e.g., iron titanate); inorganic violet pigments (e.g., manganese violet (mangoviole) and cobalt violet); inorganic green pigments (e.g., chromium oxide, chromium hydroxide, cobalt titanate, etc.); inorganic blue pigments (e.g., ultramarine blue and prussian blue); pearl pigments (e.g., titanium oxide-colored mica, titanium oxide-colored bismuth oxychloride, titanium oxide-colored talc, colored titanium oxide-colored mica, bismuth oxychloride, fish scale foil, etc.); metal powder pigments (e.g., aluminum powder, copper powder, etc.); organic pigments such as zirconium, barium, or aluminum lakes (e.g., organic pigments such as red 201, red 202, red 204, red 205, red 220, red 226, red 228, red 405, orange 203, orange 204, yellow 205, yellow 401, and blue 404, red 3, red 104, red 106, red 227, red 230, red 401, red 505, orange 205, yellow 4, yellow 5, yellow 202, yellow 203, green 3, and blue 1); natural pigments (e.g., chlorophyll, β -carotene, etc.) and the like may be used alone or in combination of 2 or more. In addition, a composite powder obtained by coating a powder with a metal oxide or the like, or a modified powder obtained by treating the surface of a powder with a compound or the like may also be used.

In the present invention, silicon oxide, titanium dioxide, zinc oxide, or a composite powder containing these components is preferably used, and from the viewpoint of skin friendliness, usability, an ultraviolet blocking effect, and emulsion stability, silicon oxide-coated zinc oxide and silicon oxide-coated titanium oxide are particularly preferable.

The particle size of the powder is not particularly limited, and is preferably 1 to 200nm from the viewpoints of ease of handling when incorporated into a cosmetic and emulsion stability.

The amount of the powder component to be incorporated in the oil-in-water emulsion of the present invention is preferably 1 to 20% by mass, and particularly preferably 1 to 10% by mass, based on the total amount of the oil-in-water emulsion composition. When the blending amount is less than 1% by mass, emulsification does not proceed sufficiently, and when it exceeds 20% by mass, greasy feeling tends to increase.

(oil phase component)

The oil phase component contained in the oil-in-water emulsion composition of the present invention includes the following components.

Examples of the liquid oils and fats include avocado oil, camellia oil, turtle oil, macadamia nut oil, corn oil, mink oil, olive oil, rapeseed oil, egg yolk oil, sesame oil, almond oil, wheat germ oil, camellia oil, castor oil, linseed oil, safflower oil, cottonseed oil, perilla oil, soybean oil, peanut oil, tea seed oil, coconut oil, rice bran oil, paulownia oil, jatropha oil, jojoba oil, germ oil, and triglycerin.

Examples of the solid fat and oil include cacao butter, coconut oil, horse fat, hydrogenated coconut oil, palm oil, beef tallow, mutton tallow, hydrogenated beef tallow, palm kernel oil, lard, beef bone fat, wood wax oil, hydrogenated oil, neatsfoot oil, wood wax, hydrogenated castor oil, and the like.

Examples of the waxes include beeswax, candelilla wax, cotton wax, carnauba wax, bayberry wax, white wax, spermaceti, montan wax, rice bran wax, lanolin, kapok wax, lanolin acetate, liquid lanolin, sugar cane wax, isopropyl lanolate, hexyl laurate, reduced lanolin, jojoba wax, hard lanolin, shellac wax, POE lanolin alcohol ether, POE lanolin alcohol acetate, POE cholesterol ether, lanolin fatty acid polyethylene glycol, and POE hydrogenated lanolin alcohol ether.

Examples of the hydrocarbon oil include liquid paraffin, ceresin, squalane, pristane, paraffin, purified ceresin, squalene, vaseline, and microcrystalline wax.

Examples of the higher fatty acid include lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, oleic acid, undecylenic acid, taconic acid, isostearic acid, linoleic acid, linolenic acid, eicosapentaenoic acid (EPA), and docosahexaenoic acid (DHA).

Examples of the higher alcohol include straight-chain alcohols (e.g., lauryl alcohol, cetyl alcohol, stearyl alcohol, behenyl alcohol, myristyl alcohol, oleyl alcohol, cetostearyl alcohol), and the like); branched alcohols (e.g., monostearyl glyceryl ether (batyl alcohol), 2-decyltetradecyl alcohol, lanolin alcohol, cholesterol, phytosterols, hexyldodecanol, isostearyl alcohol, octyldodecanol, etc.), and the like.

Examples of the synthetic ester oil include isopropyl myristate, cetyl caprylate, octyldodecyl myristate, isopropyl palmitate, butyl stearate, hexyl laurate, myristyl myristate, decyl oleate, hexyldecyl dimethylcaprylate, cetyl lactate, myristyl lactate, lanolin acetate, isocetyl stearate, isocetyl isostearate, cholesteryl 12-hydroxystearate, ethylene glycol di-2-ethylhexanoate, dipentaerythritol fatty acid ester, N-alkyldiol monoisostearate, neopentyl glycol didecanoate, diisooctadecyl malate, glycerol di-2-heptylundecanoate, trimethylolpropane tri-2-ethylhexanoate, trimethylolpropane triisostearate, pentaerythritol tetra-2-ethylhexanoate, isopropyl palmitate, isopropyl myristate, hexyl laurate, hexyl myristate, hexyl lactate, decyl lactate, lauryl lactate, lanolin acetate, isocetyl stearate, isopropyl myristate, Glycerol tri-2-ethylhexanoate, glycerol trioctanoate, glycerol trioctapalmitate, trimethylolpropane triisostearate, cetyl 2-ethylhexanoate, 2-ethylhexyl palmitate, glycerol trimyristate, glycerol tri-2-heptylundecylate, methyl ricinoleate, oleyl oleate, glycerol acetate, 2-heptylundecyl palmitate, diisobutyl adipate, 2-octyldodecyl N-lauroyl-L-glutamate, di-2-heptylundecyl adipate, ethyl laurate, di-2-ethylhexyl sebacate, 2-hexyldecyl myristate, 2-hexyldecyl palmitate, 2-hexyldecyl adipate, glycerol tri-2-heptylundecyl palmitate, glycerol tri-2-heptylundecyl stearate, methyl ricinoleate, oleyl oleate, glycerol acetate, 2-heptylundecyl palmitate, diisobutyl adipate, N-lauroyl-L-glutamate, di-2-heptylundecyl adipate, ethyl laurate, di-2-ethylhexyl sebacate, 2-hexyldecyl myristate, 2-, Diisopropyl sebacate, 2-ethylhexyl succinate, triethyl citrate, and the like.

Examples of the silicone oil include chain polysiloxanes (e.g., dimethylpolysiloxane, methylphenylpolysiloxane, diphenylpolysiloxane, etc.); cyclic polysiloxanes (e.g., octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane, etc.), silicone resins forming a three-dimensional network structure, silicone rubbers, various modified polysiloxanes (e.g., amino-modified polysiloxane, polyether-modified polysiloxane, alkyl-modified polysiloxane, fluorine-modified polysiloxane, etc.), acrylic silicones, and the like.

(Water phase component)

In the present invention, the aqueous phase component contains a lower alcohol and a polyhydric alcohol in addition to water.

Examples of the lower alcohol include ethanol, propanol, isopropanol, isobutanol, and tert-butanol.

Examples of the polyhydric alcohol include dihydric alcohols (e.g., ethylene glycol, propylene glycol, 1, 3-propanediol, 1, 2-butanediol, 1, 3-butanediol, 1, 4-butanediol, 2, 3-butanediol, 1, 5-pentanediol, 2-butene-1, 4-diol, 1, 6-hexanediol, 1, 8-octanediol, etc.); trihydric alcohols (e.g., glycerin, trimethylolpropane, etc.); tetrahydric alcohols (e.g., pentaerythritol such as 1, 2, 6-hexanetriol); pentahydric alcohols (e.g., xylitol, etc.); hexahydric alcohols (e.g., sorbitol, mannitol, etc.); polyol polymers (e.g., diethylene glycol, dipropylene glycol, triethylene glycol, polypropylene glycol, tetraethylene glycol, diglycerin, polyethylene glycol, triglycerol, tetraglycerol, polyglycerin, and the like); glycol alkyl ethers (e.g., ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, ethylene glycol monophenyl ether, ethylene glycol monohexyl ether, ethylene glycol mono 2-methylhexyl ether, ethylene glycol isoamyl ether, ethylene glycol benzyl ether, ethylene glycol isopropyl ether, ethylene glycol dimethyl ether, ethylene glycol diethyl ether, ethylene glycol dibutyl ether, etc.); glycol alkyl ethers (e.g., diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, diethylene glycol dimethyl ether, diethylene glycol diethyl ether, diethylene glycol butyl ether, diethylene glycol methyl ethyl ether, triethylene glycol monomethyl ether, triethylene glycol monoethyl ether, propylene glycol monomethyl ether, propylene glycol monoethyl ether, propylene glycol monobutyl ether, propylene glycol isopropyl ether, dipropylene glycol methyl ether, dipropylene glycol ethyl ether, dipropylene glycol butyl ether, etc.); glycol ether esters (e.g., ethylene glycol monomethyl ether acetate, ethylene glycol monoethyl ether acetate, ethylene glycol monobutyl ether acetate, ethylene glycol monophenyl ether acetate, ethylene glycol diadipate, ethylene glycol disuccinate, diethylene glycol monoethyl ether acetate, diethylene glycol monobutyl ether acetate, propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate, propylene glycol monopropyl ether acetate, propylene glycol monophenyl ether acetate, etc.); glycerol monoalkyl ethers (e.g., chimyl alcohol, selachyl alcohol, batyl alcohol, etc.); sugar alcohols (e.g., reducing alcohols such as sorbitol, maltitol, maltotriose, mannitol, sucrose, erythritol, glucose, fructose, amylolytic sugar, maltose, xylose, amylolytic, etc.); glysolid; tetrahydrofurfuryl alcohol; POE-tetrahydrofurfuryl alcohol, POP-butyl ether; POP POE butyl ether; glyceryl tripropylene oxide ether; POP-glycerol ether; POP-glyceryl ether phosphoric acid; POP, POE, pentane erythritol ether, polyglycerol, etc.

In the oil-in-water type emulsion composition of the present invention, it is preferable to blend a thickener having salt resistance, particularly succinoglycan, xanthan gum or acrylamide, as an aqueous phase component in order to impart stability against sedimentation and creaming (creaming) of emulsified oil droplets and further stability against aggregation of powder. When a general thickener is used, the viscosity of the thickener may be lowered by the action of the salt gradually eluted from the hydrophobized powder into the aqueous phase with time, but when a thickener having excellent salt resistance such as succinoglycan is used, the sedimentation of the emulsified particles can be prevented for a long period of time without being affected by the eluted salt.

The preferable amount of the thickener is 0.01 to 5% by mass based on the total components.

The oil-in-water type emulsion composition of the present invention contains the above-mentioned components to form a so-called pickering emulsion.

Pickering emulsion (Pickering emulsion) is known as an O/P/W type emulsion in which an oil phase is uniformly dispersed in an aqueous phase through fine particles (Powder) in an oil-in-water type dispersion. The present invention uses a cationic surfactant having a specific structure in the emulsion to enhance the emulsion stability of the powder.

The structure of the oil-in-water emulsion composition of the present invention will be described below according to the production method thereof.

In the production method of the present invention, it is necessary to form an aqueous dispersion having a lamellar liquid crystal structure with a cationic surfactant having 2 alkyl chains with carbon chains of 12 to 22 carbon atoms before the emulsification step. In addition, the powder component is also uniformly dispersed in water before emulsification.

As a specific method, for example, a powder component and a cationic surfactant may be added to water, and a homogeneous aqueous dispersion of a layered structure and powder may be prepared by an emulsification homogenizer, ultrasonic treatment, or the like. Alternatively, the powder component and the cationic surfactant may be separately dispersed in a part of water and then mixed. In the above step, other aqueous phase components may be added and mixed.

The cationic surfactant having 2 alkyl chains with carbon chains of 12 to 22 carbon atoms used in the present invention forms a lamellar liquid crystal structure in which lipophilic groups are associated in water at a wide concentration and temperature range. For example, it is known that dialkylmethylammonium chloride forms a liquid crystal structure shown in fig. 1 in a two-component system with water at a low concentration. In the present invention, it is particularly preferable that the cationic surfactant is in a state corresponding to a water/liquid crystal stable dispersion phase (water/liquid crystal dispersion) in fig. 1, that is, a state in which a small lamellar structure of the cationic surfactant is dispersed in water.

When the cationic surfactant in the lamellar liquid crystal state is dispersed in the same water system as the powder component, the hydrophilic group of the positively charged liquid crystal is generally adsorbed on the surface of the negatively charged powder particle. It is considered that by dispersing the particles by an appropriate treatment, a powder particle dispersion having numerous liquid crystal surfactants attached to the surface is produced.

FIG. 2 shows the preparation of silica-coated titanium oxide by changing the amount of dimethyl dioctadecyl ammonium chloride: 3 wt%, oil content: 47 wt%, water: the zeta potential of the silica-coated titanium oxide powder dispersed in water together with dimethyldioctadecylammonium chloride was measured for the remaining oil-in-water emulsion composition. As shown in fig. 2, as the concentration of the cationic surfactant increases, the zeta potential, which indicates the surface potential of the powder, shifts in the positive direction, and it is presumed that dimethyldioctadecylammonium chloride having a cationic group is adsorbed on the surface of the powder. As is clear from fig. 2, the adsorption amount increases as the cationic surfactant is incorporated into the powder more, but if the amount is too high, the phase inversion may be water-in-oil at the time of emulsification. Therefore, in the present invention, the mixing ratio of the specific cationic surfactant to the powder component is preferably about 5: 0.001 to 5: 1, although it depends on other formulation components.

After the above-described step, an oil phase component is added to the obtained dispersion of the cationic surfactant-adsorbed powder particles, and the resulting mixture is emulsified with an emulsifier or the like to obtain the oil-in-water type emulsion composition of the present invention. The addition of the oil phase component may be carried out under heating as necessary, or may be carried out in advance by a treatment such as crushing depending on the state of the oil phase component.

That is, the present invention can be said to be an O/P/W emulsion in which an oil phase is uniformly dispersed in an aqueous phase by fine particles adsorbing a specific cationic surfactant.

Here, it is considered that the added oil component enters the lipophilic group-associated portion of the lamellar liquid crystal adsorbed on the powder, and forms oil droplets adsorbing the powder particles at the interface with the aqueous phase. It is presumed that in this case, adsorption of the oil droplets by the powder is enhanced by the action of the specific cationic surfactant, and a composition having excellent emulsion stability can be obtained as compared with a conventional O/P/W emulsion in which oil droplets are dispersed only by the adsorption force of the powder.

As is clear from the above, the emulsion composition of the present invention has a structure in which powder particles are adsorbed on oil droplets dispersed in an aqueous phase, and further, a cationic surfactant is adsorbed on the powder particles.

In the method for producing the oil-in-water type emulsion composition of the present invention, it is preferable that the specific cationic surfactant in a liquid crystal state is adsorbed on the powder before the emulsification of the aqueous phase and the oil phase as described above. When the cationic surfactant is added during or after emulsification, the emulsified state and emulsion stability cannot be sufficiently improved.

(other Components)

In the oil-in-water type emulsion composition of the present invention, it is preferable that a surfactant is not substantially contained, except for a cationic active agent having a specific structure as an essential component, from the viewpoint of reducing irritation. In the present invention mainly involving emulsification with powder, an emulsified composition having sufficiently high stability can be obtained by blending only a small amount of a specific cationic surfactant that contributes to the stability of powder emulsification. Therefore, it is not particularly necessary to separately add a surfactant as an emulsifier.

In the present invention, "substantially not contained" means "not contained at all" or an extremely small amount of the compound having no influence on the present invention even if contained.

Further, the oil-in-water emulsion composition of the present invention may be prepared by a conventional method by blending components generally used in cosmetics and quasi drugs in addition to the above components within a range not impairing the effects thereof. The ingredients that can be blended are not limited, but examples include a humectant, monosaccharide, oligosaccharide, organic amine, an ultraviolet absorber, an antioxidant, a preservative (ethyl p-hydroxybenzoate, butyl p-hydroxybenzoate, etc.), a whitening agent (for example, saxifrage extract, arbutin, tranexamic acid, 4-methoxysalicylic acid, etc.), various extracts (for example, ginger, phellodendron, coptis root, chinese violet root, white birch, loquat, ginseng, aloe, mallow, iris, grape, luffa, lily, saffron, ligusticum wallichii, ginger, hypericum, formononetin, garlic, capsicum, dried orange peel, angelica, peony, seaweed, etc.), an activator (for example, panthenyl ethyl ether, nicotinamide, biotin, pantothenic acid, royal jelly, cholesterol derivatives, etc.), an anti-fat-overflow agent (for example, pyridoxine, dimethyl dithianne, etc.), a perfume, a pigment, and the like.

Examples of the humectant include, in addition to the polyhydric alcohol, chondroitin sulfate, hyaluronic acid, mucin sulfate, caronin acid (charonin acid), atelocollagen, cholesteryl-12-hydroxystearate, sodium lactate, bile acid salt, d 1-pyrrolidone carboxylate, short-chain soluble collagen, diglycerol (EO) PO adduct, rosa roxburghii extract, yarrow extract, and melia officinalis extract.

Examples of the monosaccharide include triose (e.g., D-glyceraldehyde, dihydroxyacetone, etc.); tetroses (e.g., D-erythrose, D-erythrulose, D-threose, erythritol, etc.); pentoses (e.g., L-arabinose, D-xylose, L-lyxose, D-arabinose, D-ribose, D-ribulose, D-xylulose, L-xylulose, etc.); hexoses (e.g., D-glucose, D-talose, D-psicose, D-galactose, D-fructose, L-galactose, L-mannose, D-tagatose, etc.); heptoses (e.g., aldoheptoses, heplose, etc.); octyl sugar (e.g., octyl ketose); deoxy sugars (e.g., 2-deoxy-D-ribose, 6-deoxy-L-galactose, 6-deoxy-L-mannose, etc.); aminosugars (e.g., D-glucosamine, D-galactosamine, sialic acid, aminouronic acid, histidine, etc.); uronic acids (e.g., D-glucuronic acid, D-mannuronic acid, L-guluronic acid, D-galacturonic acid, L-iduronic acid, etc.) and the like.

Examples of the oligosaccharide include sucrose, gentiotriose, umbelliferose, lactose, psyllium seed sugar, isolignocelluloses (isolichinose), α -trehalose, raffinose, lignocelluloses (lichnose), umbilicin, and stachyose verbascose.

Examples of the amino acid include neutral amino acids (e.g., threonine and cysteine); basic amino acids (e.g., hydroxylysine, etc.), and the like. Examples of the amino acid derivative include sodium acyl sarcosinate (sodium lauroyl sarcosinate), acyl glutamate, sodium acyl β -alanine, glutathione, pyrrolidone carboxylic acid, and the like.

Examples of the organic amine include monoethanolamine, diethanolamine, triethanolamine, morpholine, triisopropanolamine, 2-amino-2-methyl-1, 3-propanediol, and 2-amino-2-methyl-1-propanol.

Examples of the ultraviolet absorber which is an organic compound as the ultraviolet ray protective agent include benzoic acid-based ultraviolet absorbers (for example, p-aminobenzoic acid (hereinafter abbreviated as "PABA"), PABA monopropanetriol ester, N-dipropoxypPABA ethyl ester, N-diethoxypPABA ethyl ester, N-dimethylpPABA butyl ester, N-dimethylpPABA ethyl ester, etc.); anthracene-based ultraviolet absorbers (e.g., 3, 5-trimethylcyclohexyl-N-acetyl anthranilate, etc.); salicylic acid ultraviolet absorbers (e.g. amyl salicylate, salicylic acid)Phenyl esters, 3, 5-trimethylcyclohexyl salicylate, octyl salicylate, phenyl salicylate, benzyl salicylate, p-isopropenylphenyl salicylateEtc.); cinnamic acid-type ultraviolet absorbers (e.g., octyl cinnamate, ethyl-4-isopropyl cinnamate, methyl-2, 5-diisopropyl cinnamate, ethyl-2, 4-diisopropyl cinnamate, methyl-2, 4-diisopropyl cinnamate, propyl-p-methoxy cinnamate, isopropyl-p-methoxy cinnamate, isopentyl-p-methoxy cinnamate, octyl-p-methoxy cinnamate (2-ethylhexyl-p-methoxy cinnamate), 2-ethoxyethyl-p-methoxy cinnamate, cyclohexyl-p-methoxy cinnamate, ethyl- α -cyano- β -phenyl cinnamate, 2-ethylhexyl- α -cyano- β -phenyl cinnamate, methyl-2, 5-diisopropyl cinnamate, methyl-p-methoxy cinnamate, isopropyl-p-methoxy cinnamate, isopentyl-p-methoxy cinnamate, octyl-p-methoxy cinnamate, 2-ethylhexyl-, Glyceryl mono-2-ethylhexanoyl-di-p-methoxycinnamate, etc.); benzophenone-based ultraviolet absorbers (e.g., 2, 4-dihydroxybenzophenone, 2 ' -dihydroxy-4-methoxybenzophenone, 2 ' -dihydroxy-4, 4 ' -dimethoxybenzophenone, 2 ', 4, 4 ' -tetrahydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-methoxy-4 ' -methylbenzophenone, 2-hydroxy-4-methoxybenzophenone-5-sulfonate, 4-phenylbenzophenone, 2-ethylhexyl-4 ' -phenyl-benzophenone-2-carboxylate, 2-hydroxy-4-n-octyloxybenzophenone, 4-hydroxy-3-carboxylic acid benzophenone, etc.); 3- (4' -methylbenzylidene) -d, l-camphor, 3-benzylidene-d, l-camphor; 2-phenyl-5-methylbenzoxazole; 2, 2-hydroxy-5-methylphenylbenzotriazole; 2- (2 '-hydroxy-5' -tert-octylphenyl) benzotriazole; 2- (2 ' -hydroxy-5 ' -methylphenyl benzotriazole, dibenzylazine, dianisiloylmethane, 4-methoxy-4 ' -tert-butyldibenzoylmethane, 5- (3, 3-dimethyl-2-norbornanyl) -3-pentan-2-one, and the like.

Examples of the ultraviolet absorber of the inorganic compound include titanium oxide, zinc oxide, iron oxide, cerium oxide, and composite powder containing these.

Examples of the antioxidant auxiliary include phosphoric acid, citric acid, ascorbic acid, maleic acid, malonic acid, succinic acid, fumaric acid, cephalin, hexametaphosphate, phytic acid, ethylenediaminetetraacetic acid, and the like.

The formulation of the oil-in-water emulsion composition of the present invention is not limited, and may be in the form of a lotion (emulsion), cream, gel, or the like, and may be appropriately determined depending on the formulation components, the intended use, and the like.

Next, an external preparation for skin for sun-screening, which is a second embodiment of the present invention, will be described.

In general, an external preparation for skin against ultraviolet rays is prepared by blending an organic ultraviolet ray protective agent and a powdery inorganic ultraviolet ray protective agent as an oil agent into a base. From the viewpoint of blending a large amount of the ultraviolet ray protection agent, a water-in-oil emulsion composition is widely used as a base, but the external preparation for skin having the above-mentioned structure has an unpleasant oily feeling and a strong powdery feeling, and therefore, a good feeling in use cannot be obtained.

On the other hand, when an oil-in-water emulsion composition is used as a base material, an external skin preparation having a tender feeling and a refreshing feeling can be obtained in view of the characteristics of the composition, but it is difficult to sufficiently blend the ultraviolet ray protection agent and maintain emulsion stability. Further, the conventional oil-in-water type sunscreen skin external preparation has a problem that it is inferior to water-in-oil type sunscreen skin external preparation in water resistance and is easily exfoliated by sweat or sebum.

Therefore, the present inventors have further studied the properties of the oil-in-water emulsion composition of the present invention and found that an oil-in-water sunscreen external preparation for skin having excellent emulsion stability and little tightening feeling can be obtained by blending the composition.

The components of the oil-in-water emulsion composition to be blended in the external preparation for skin for sunscreen of the present invention are as described above. However, the external preparation for skin for sunscreen of the present invention is obtained by dispersing the hydrophobized powder in the oil phase component of the oil-in-water emulsion composition.

Examples of the hydrophobized powder dispersed in the oil phase component include those obtained by hydrophobizing the surface of inorganic powder particles with, for example, silicones such as methylhydrogenpolysiloxane and dimethylpolysiloxane, dextrin fatty acid esters, higher fatty acids, higher alcohols, fatty acid esters, metal soaps, alkyl phosphate ethers, fluorine compounds, hydrocarbons such as squalane and paraffin, wet methods, vapor phase methods, and mechanochemical methods using solvents, and those obtained by coating inorganic powder particles with silicon oxide and then hydrophobizing the particles with an alkyl-modified silane coupling agent.

Examples of the inorganic powder particles subjected to the hydrophobic treatment include titanium oxide, zinc oxide, talc, mica, sericite, kaolin, mica titanium, black iron oxide, yellow iron oxide, red iron oxide, ultramarine, prussian blue, chromium oxide, chromium hydroxide, and the like. In the present invention, it is particularly preferable to contain hydrophobized particulate titanium oxide and/or hydrophobized particulate zinc oxide.

In view of the property of the present invention that the hydrophobized powder is dispersed in the oil phase component, the average particle diameter is preferably smaller than that of the emulsified particles as the oil phase. In particular, when a hydrophobized powder is used as an ultraviolet scattering agent, it is preferable to use a powder having an average particle diameter of 100nm or less in the external preparation for sunscreen skin of the present invention.

In addition, the sunscreen skin external preparation of the present invention may contain other components than the essential components as appropriate within a range not to impair the effects thereof. However, it is preferable that the oil-in-water type emulsion composition constituting the external preparation for sunscreen skin contains substantially no water-soluble surfactant other than the specific cationic surfactant. The skin external preparation for sunscreen which is excellent in water resistance can be obtained without containing a surfactant as an emulsifier.

The external preparation for skin of the present invention can be prepared by the above-mentioned method for producing an oil-in-water emulsion composition of the present invention using the above-mentioned essential components and other optional components. For example, a desired external preparation for skin for sun protection can be obtained by adding a powder component and a specific cationic surfactant to a part of water, mixing them under heating, adding the rest of water and an aqueous phase component, mixing them, and then adding and mixing an oil phase component in which a hydrophobic powder is dissolved and stirred under heating.

The formulation thereof may be in the form of a lotion, emulsion, paste, gel or the like, which is determined as appropriate depending on the formulation components, the intended use, and the like.

The third embodiment of the present invention is a cosmetic composition.

Conventionally, various powders have been blended in cosmetic compositions for imparting functions such as coloring the skin or hair, concealing spots and freckles, protecting the skin from ultraviolet rays, and absorbing sweat or sebum. On the other hand, there is a demand for development of a technique for imparting sufficient powder dispersion stability by preventing aggregation and sedimentation of emulsified particles or fine powder particles with time or temperature change when the powder is blended in an emulsion composition.

Further, the oil-in-water type emulsion composition has a refreshing feeling in use and is suitable for cosmetics such as emulsion, cream, and emulsion foundation. Although silicone oils are widely used to provide excellent feeling in use and high water repellency, oils having a high proportion of silicone oils having low compatibility with other oil components such as hydrocarbons require a complicated selection of an optimal surfactant, and stable emulsification is difficult. In particular, when silicone surfactant-based silicone emulsion oil is used, a large amount of silicone surfactant must be blended for stabilization, and there is a problem that the composition has a greasy feeling due to the surfactant.

The present inventors have further studied the properties of the oil-in-water emulsion composition of the present invention, and have found that an oil-in-water cosmetic composition having excellent emulsion stability and less greasy feeling can be obtained by blending the composition.

The components of the oil-in-water emulsion composition to be blended in the cosmetic composition of the present invention are as described above. However, the cosmetic composition of the present invention is obtained by dispersing the hydrophobized powder in the oil phase component of the oil-in-water emulsion composition.

Examples of the hydrophobized powder dispersed in the oil phase component include those obtained by hydrophobizing the surface of inorganic powder particles with, for example, silicones such as methylhydrogenpolysiloxane and dimethylpolysiloxane, dextrin fatty acid esters, higher fatty acids, higher alcohols, fatty acid esters, metal soaps, alkyl phosphate ethers, fluorine compounds, hydrocarbons such as squalane and paraffin, wet methods, vapor phase methods, and mechanochemical methods using solvents, and those obtained by coating inorganic powder particles with silicon oxide and then hydrophobizing the particles with an alkyl-modified silane coupling agent.

Examples of the inorganic powder particles subjected to the hydrophobic treatment include titanium oxide, zinc oxide, talc, mica, sericite, kaolin, mica titanium, black iron oxide, yellow iron oxide, red iron oxide, ultramarine, prussian blue, chromium oxide, chromium hydroxide, and the like. In the present invention, particularly, hydrophobized particulate titanium dioxide, red iron oxide, yellow iron oxide, black iron oxide and/or alumina is preferably contained. Since the powder after the hydrophobic treatment has high water resistance to sebum, sweat, and the like and good makeup retention, a composition having good feeling of use during application and excellent properties after application can be obtained by dispersing the powder in the oil phase component of the oil-in-water emulsion composition.

In view of the property of the present invention that the hydrophobized powder is dispersed in the oil phase component, the average particle diameter is preferably smaller than that of the emulsified particles as the oil phase. In particular, in the cosmetic composition of the present invention, it is preferable to use a powder having an average particle diameter of 100nm or less.

The cosmetic composition of the present invention contains 50% by mass or more of a silicone oil with respect to the oil phase component in an oil-in-water emulsion composition as an essential component.

Examples of the silicone oil that can be suitably used in the present invention include chain polysiloxanes (e.g., dimethylpolysiloxane, methylphenylpolysiloxane, diphenylpolysiloxane, etc.); cyclic polysiloxanes (e.g., octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane, etc.), silicone resins having a three-dimensional network structure, silicone rubbers, various modified polysiloxanes (e.g., amino-modified polysiloxane, polyether-modified polysiloxane, alkyl-modified polysiloxane, fluorine-modified polysiloxane, etc.), silicone acrylates, etc., and the like, and they may be blended singly or in combination of 2 or more.

In particular, silicone acrylates represented by the following general formula (I) are preferably used in the present invention.

(formula 3)

(formula 3)

In the general formula (I), R is an alkyl group having 10 to 20 carbon atoms. And a + b + c is 1, a, b and c are all 0.2 or more, and d is an integer of 5 to 100.

In the present invention, both terminal silicone-modified glycerin represented by the following general formula (II) is preferably blended.

(chemical formula 4)

In the formula, R1 is a C1-12 linear or branched alkyl group or a phenyl group, and R2 is a C2-11 alkylene group. In addition, m is 10 to 120, and n is 1 to 11.

The compounds represented by the above general formulae (I) and (II) may be compounded singly or in combination.

The oil phase of the oil-in-water emulsion composition contained in the cosmetic composition of the present invention may contain, in addition to a specific amount of silicone oil, oil components generally used in cosmetics, such as liquid oils and fats, waxes, hydrocarbon oils, higher fatty acids, higher alcohols, and synthetic ester oils.

In the cosmetic composition of the present invention, components other than the essential components may be appropriately blended within a range not impairing the effects thereof. However, it is preferable that substantially no water-soluble surfactant is blended, other than the specific cationic surfactant contained in the oil-in-water type emulsion composition constituting the cosmetic composition. A cosmetic composition having extremely high water resistance can be obtained without containing a water-soluble surfactant as an emulsifier.

The cosmetic composition of the present invention can be prepared by the above-mentioned oil-in-water emulsion composition preparation method of the present invention using the above-mentioned essential components and other optional components. For example, a powder component and a specific cationic surfactant may be added to a part of water, mixed under heating, the rest of water and an aqueous phase component may be added, mixed, and then an oil phase component in which a hydrophobic powder is dissolved and stirred under heating may be added and mixed under heating to obtain a desired cosmetic composition.

The formulation thereof may be in the form of a lotion, emulsion, paste, gel or the like, which is determined as appropriate depending on the formulation components, the intended use, and the like.

The fourth embodiment of the present invention is a hair cosmetic for styling.

Currently, styling agents for hair are required to have styling properties, and also to have no greasy feeling or high moisture resistance when used. For example, as a general method for improving setting properties or moisture resistance, it is considered that the viscosity of the product is increased by adjusting the amount of the setting oil agent or the like. However, although the setting property can be improved by this, the setting property is generally improved, and the greasy feeling is also increased.

On the other hand, it is known that greasiness can be improved by using an oil-in-water emulsion for a setting agent, but it is difficult to achieve stable emulsification as an emulsion together with selection of an oil agent for optimizing setting properties.

The present inventors have further studied the properties of the oil-in-water emulsion composition of the present invention, and have found that a hair cosmetic for styling having excellent emulsion stability, excellent styling power and moisture resistance, and less greasy feeling can be obtained by blending the composition.

The components of the oil-in-water emulsion composition to be blended in the hair cosmetic for permanent hair of the present invention are as described above. However, the present invention contains 1 to 30 mass% of solid oil and 1 to 30 mass% of liquid oil with respect to the total components constituting the present invention.

The solid oil component in the present invention means an oil component which is solid at room temperature and is generally used in cosmetics. Specific examples thereof include solid fats and oils such as cacao butter, coconut oil, horse oil, hydrogenated coconut oil, palm oil, beef tallow, mutton tallow, hydrogenated beef tallow, palm kernel oil, lard, beef bone oil, wood wax oil, hydrogenated oil, neatsfoot oil, wood wax, and hydrogenated castor oil; waxes such as beeswax, candelilla wax, cotton wax, carnauba wax, bayberry wax, white wax, spermaceti wax, montan wax, rice bran wax, lanolin, kapok wax, lanolin acetate, sugarcane wax, isopropyl lanolate, hexyl laurate, reduced lanolin, jojoba wax, hard lanolin, shellac wax, POE lanolin alcohol ether, POE lanolin alcohol acetate, POE cholesterol ether, and POE hydrogenated lanolin alcohol ether; hydrocarbon waxes such as polyethylene wax, paraffin wax, refined ozokerite, vaseline, microcrystalline wax, Lunacera, and ozokerite; higher alcohols such as cetyl alcohol, cetostearyl alcohol, stearyl alcohol, and behenyl alcohol; fatty acid glyceryl ethers such as monostearylpropanetriol (batyl alcohol); and fatty acid triglycerides such as glycerol acetate and glycerol tri-2-heptylundecanoate. The solid oil components can be mixed individually or in combination of 2 or more.

The amount of the solid oil component to be blended in the present invention is 1 to 30% by mass, more preferably 2 to 15% by mass, based on the total amount of the hair cosmetic for styling. When the amount of the solid oil component is less than 1% by mass, the setting force is insufficient, and when the amount exceeds 30% by mass, stickiness may occur.

The liquid oil component used in the present invention means an oil component which is liquid at room temperature and is generally used in cosmetics. Specific examples thereof include liquid oils and fats such as avocado oil, evening primrose oil, camellia oil, turtle oil, macadamia nut oil, sunflower seed oil, almond oil, corn oil, mink oil, olive oil, rapeseed oil, egg yolk oil, sesame oil, almond oil, wheat germ oil, camellia oil, castor oil, linseed oil, safflower oil, cottonseed oil, perilla oil, soybean oil, peanut oil, tea seed oil, coconut oil, rice bran oil, paulownia oil, japanese paulownia oil, jojoba oil, germ oil, and the like; cetyl octanoate, cetyl 2-ethylhexanoate, hexyldecyl dimethyloctanoate, ethyl laurate, hexyl laurate, isopropyl myristate, 2-hexyldecyl myristate, myristyl myristate, octyldodecyl myristate, isopropyl palmitate, 2-ethylhexyl palmitate, 2-hexyldecyl palmitate, 2-heptylundecyl palmitate, butyl stearate, isocetyl isostearate, decyl oleate, dodecyl oleate, oleyl oleate, myristyl lactate, cetyl lactate, diisooctadecyl malate, cholesteryl 12-hydroxyoctadecyl stearate, methyl ricinoleate, 2-octyldodecyl N-lauroyl-L-glutamate, lauryl dimethyl octanoate, hexyl laurate, isopropyl palmitate, hexyl palmitate, isopropyl myristate, hexyl palmitate, 2-hexyldecyl palmitate, hexyl stearate, hexyl oleate, 2-ethylhexyl succinate, diisobutyl adipate, 2-hexyldecyl adipate, di-2-heptylundecyl adipate, diisopropyl sebacate, di-2-ethylhexyl sebacate, ethylene glycol di-2-ethylhexanoate, neopentyl glycol didecanoate, neopentyl glycol dioctanoate, glycerol acetate, ester oils such as glycerol di-2-heptylundecanoate, glycerol trioctanoate, glycerol tri-2-ethylhexanoate, glycerol trimyristate, glycerol trioctanoate, glycerol tri-2-heptylundecanoate, trimethylolpropane tri-2-ethylhexanoate, trimethylolpropane triisostearate, pentaerythritol tetraoctanoate, and pentaerythritol tetra-2-ethylhexanoate; hydrocarbon oils such as liquid paraffin, ceresin, squalene, pristane, polybutene, etc.; chain polysiloxanes such as dimethylpolysiloxane, methylphenylpolysiloxane, and diphenylpolysiloxane, cyclic polysiloxanes such as octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, and dodecamethylcyclohexasiloxane, and various modified polysiloxanes such as amino-modified polysiloxane, polyether-modified polysiloxane, alkyl-modified polysiloxane, and fluorine-modified polysiloxane. The liquid oil components may be mixed singly or in combination of 2 or more.

The amount of the liquid oil component to be blended in the hair cosmetic for styling of the present invention is 1 to 30% by mass, more preferably 5 to 20% by mass, based on the total amount. When the amount of the liquid oil component is less than 1% by mass, the setting force is insufficient, and when the amount is more than 30% by mass, the composition becomes sticky.

In the hair cosmetic composition for hair styling of the present invention, the powder component of the oil-in-water emulsion composition as an essential component is preferably blended with silicon oxide, titanium dioxide, zinc oxide, or a composite powder containing these. In particular, silicon oxide is preferably used because it has transparency and does not turn white after coating. The particle size of the powder is not particularly limited, but is preferably 1 to 100nm from the viewpoint of ease of handling and emulsion stability when incorporated into an aromatic cosmetic.

In the hair cosmetic for permanent set of the present invention, components other than the essential components may be appropriately blended within a range not impairing the effects. However, it is preferable that substantially no water-soluble surfactant is blended in addition to the specific cationic surfactant contained in the oil-in-water emulsion composition constituting the hair cosmetic for permanent set. The hair cosmetic for hair styling which contains no surfactant as an emulsifier has low skin irritation and high water resistance.

The hair cosmetic for styling of the present invention can be prepared by the above-mentioned method for preparing the oil-in-water emulsion composition of the present invention, using the above-mentioned essential components and other optional components. For example, a powder component and a specific cationic surfactant may be added to a part of water, mixed under heating, the rest of water and an aqueous phase component may be added, and then an oil phase component containing a solid oil component and a liquid oil component dissolved in advance under heating may be added and mixed under heating to obtain a desired hair cosmetic for styling.

The formulation thereof may be in the form of a lotion, emulsion, paste, gel or the like, which is determined as appropriate depending on the formulation components, the intended use, and the like.

Example 1

The present invention is described more specifically by the following examples, but the technical scope of the present invention should not be construed as being limited to the following examples. In the present example, "mass%" or "%" of the amount to be blended is indicated, and unless otherwise specified, it represents mass% relative to the total amount of the composition.

First, the evaluation method used in this example will be described.

Evaluation (1): emulsion stability (appearance)

The appearance of the emulsion was visually observed within 1 day after the preparation of the emulsion.

O: the sample was homogeneous and no oil-bleeding or powder aggregation was observed.

And (delta): the sample was substantially uniform and slightly oiled.

X: the sample was not uniform, or significant oil phase separation or powder aggregation was confirmed.

Evaluation (2): emulsion stability (emulsion particle)

When the sample is observed with an optical microscope,

o: the emulsified particles were uniform, and no aggregation or aggregation was observed.

And (delta): although the emulsified particles were substantially uniform, they were found to be slightly aggregated or aggregated.

X: the emulsified particles were not uniform, and significant aggregation or aggregation was observed.

Evaluation (3): skin irritation test

The closed ointment test was performed for 24 hours on the inner side of the forearm of 10 evaluators, and the average value was calculated based on the following criteria.

No abnormalities were confirmed at all.

Confirm reddish.

Confirm red.

Confirm redness and pimples.

The evaluation criteria of the "skin irritation test" are as follows.

Very good: the average value of 10 evaluators was 0 or more and less than 0.15

O: the average value of 10 evaluators was 0.15 or more and less than 0.2

And (delta): the average value of 10 evaluators was 0.2 or more and less than 0.3

X: the average value of 10 evaluators was 0.3 or more

Evaluation (4): evaluation of greasy feeling upon coating

The actual use test of each sample was conducted by 10 special evaluators. The evaluation criteria are as follows.

Very good: the 8 or more evaluators confirmed that the coating had no greasy feeling.

O: 6 or more and less than 8 evaluators confirmed no greasy feeling in coating.

And (delta): 3 or more and less than 6 evaluators confirmed no greasy feeling in coating.

X: less than 3 evaluators confirmed no greasy feel in the application.

An oil-in-water emulsion containing the compounding composition shown in table 1 was prepared by the following method, and each sample was subjected to the evaluation test concerning the above-mentioned evaluations (1) to (4).

[ TABLE 1]

(preparation method)

Glycerol and succinoglycan as water phase components and silica-coated zinc oxide as powder components were added to purified water and mixed. To this solution, octadecyltrimethylammonium chloride or dimethyldioctadecylammonium chloride separately dispersed in purified water was added, and heat ultrasonic treatment was performed. After the powder components are uniformly dispersed, the remaining oil phase components are added and mixed with a mixer until uniform to obtain an oil-in-water type emulsified composition.

As is clear from table 1, the emulsifiability of test example 1 in which only the powder was blended was significantly poor. The emulsifying property of test example 2 in which a small amount of the single-chain cationic active agent was added was good, but the skin irritation was high and the greasy feeling was likely to be high. On the other hand, the emulsifying property, skin irritation and greasy feeling of test example 3 in which the cationic active agent having 2 long-chain alkyl groups was added were all good.

Then, in order to examine the preferable blending amount of the powder, an oil-in-water emulsion containing the blending composition shown in table 2 was prepared by a usual method, and each sample was subjected to the evaluation test concerning the above evaluations (1) to (4).

[ TABLE 2]

(preparation method)

Glycerol and succinoglycan as water phase components and silica-coated zinc oxide as powder components were added to purified water and mixed. To this solution, dimethyldioctadecylammonium chloride dispersed separately in purified water was added and heat-treated with ultrasonic waves. After the powder components are uniformly dispersed, the remaining oil phase components are added and mixed with a mixer until uniform to obtain an oil-in-water type emulsified composition.

As is clear from table 2, the emulsions of test examples 5 to 7 exhibited excellent emulsion stability, low greasy feeling, and low skin irritation. On the other hand, the emulsion of test example 4 containing 0.1 mass% of the powder was slightly inferior in emulsion stability, and the emulsion of test example 8 containing 30 mass% of the powder was strong in greasy feeling.

Therefore, the amount of the powder of the oil-in-water emulsion of the present invention is preferably 1 to 20% by mass based on the total amount of the emulsion.

Then, in order to examine a preferable blending amount of the cationic surfactant having 2 long-chain alkyl groups, an oil-in-water emulsion having a blending composition described in table 3 was prepared by a usual method, and each sample was subjected to an evaluation test concerning the above evaluations (1) to (4).

[ TABLE 3 ]

(preparation method)

Glycerol and succinoglycan as water phase components and silica-coated zinc oxide as powder components were added to purified water and mixed. To this solution, dimethyldioctadecylammonium chloride dispersed separately in purified water was added and heat-treated with ultrasonic waves. After the powder components are uniformly dispersed, the remaining oil phase components are added and mixed with a mixer until uniform to obtain an oil-in-water type emulsified composition.

As is clear from table 3, in test examples 10 to 12, the emulsions exhibited excellent emulsion stability, low greasy feeling, and low skin irritation. On the other hand, the emulsion of test example 9 in which 0.0005 mass% of the cationic surfactant was blended was poor in emulsifiability, and the emulsion of test example 13 in which 1 mass% of the cationic surfactant was blended was slightly poor in skin irritation and strong in greasy feeling.

Therefore, the amount of the cationic surfactant incorporated in the oil-in-water emulsion of the present invention is preferably 0.001 to 0.5% by mass based on the total amount of the emulsion.

Then, an oil-in-water emulsion containing the compounding composition shown in table 4 was prepared by a usual method, and each sample was subjected to the evaluation tests related to the above evaluations (1) to (4).

[ TABLE 4 ]

(preparation method)

Glycerol and succinoglycan as water phase components and silica-coated zinc oxide as powder components were added to purified water and mixed. To this solution, dimethyldioctadecylammonium chloride dispersed separately in purified water was added and heat-treated with ultrasonic waves. After the powder components are uniformly dispersed, the remaining oil phase components are added and mixed with a mixer until uniform to obtain an oil-in-water type emulsified composition.

As is clear from table 4, the emulsions of test examples 15 to 17 exhibited excellent emulsion stability, low greasy feeling, and low skin irritation. On the other hand, the emulsion of test example 14 having a chain length of 10 had poor emulsifiability, and the greasy feeling increased as the chain length was increased to 18 to 22 (test examples 16 to 17).

Therefore, the oil-in-water emulsion of the present invention preferably has a chain length of 2 alkyl groups of the cationic active agent of 12 to 22.

Further, the oil-in-water type emulsion composition was evaluated for changes with time in emulsion stability due to the addition of succinoglycan, xanthan gum, or acrylamide. The evaluation method is as follows. Evaluation (5): stability over time

An oil-in-water type emulsion composition having a compounding composition shown in table 5 below was prepared, and the state of the emulsion after 1 month from the start of preparation was visually observed for the compositions of the respective test examples.

Very good: the composition remains emulsified as prepared.

O: some emulsion settling was seen, but the composition remained largely emulsified.

And (delta): the emulsified particles settled and aggregation of the particles was also confirmed.

X: the emulsified particles in the composition settle and aggregate, and the oil phase is completely separated.

[ TABLE 5 ]

(preparation method)

Glycerin, succinoglycan, xanthan gum, acrylamide or polyacrylate as an aqueous phase component, and silica-coated zinc oxide as a powder component were added to purified water and mixed. To this solution, dimethyldioctadecylammonium chloride dispersed separately in purified water was added and heat-treated with ultrasonic waves. After the powder components are uniformly dispersed, the remaining oil phase components are added and mixed with a mixer until uniform to obtain an oil-in-water type emulsified composition.

As shown in Table 5, test examples 18 to 20 in which succinoglycan, xanthan gum, or acrylamide was blended maintained in a stable emulsified state for a long period of time. On the other hand, in test example 21 in which another thickener was added and test example 22 in which no thickener was added, the stability with time was slightly lowered.

Therefore, in the oil-in-water emulsion composition of the present invention, 1 or more of succinoglycan, xanthan gum and acrylamide are preferably blended.

The method for producing the oil-in-water emulsion composition of the present invention was studied. Emulsion compositions having the formulations shown in Table 6 were prepared by the following respective preparation methods, and the emulsified states thereof were evaluated. The results are shown in Table 7.

Preparation method

(test example 23)

Mixing a material obtained by uniformly dispersing the water phase component and the powder component in a part of the purified water and a material obtained by uniformly dispersing the surfactant component in the remaining purified water, heating to 70 deg.C, and subjecting to ultrasonic treatment. Adding oil phase component heated to 70 deg.C, and emulsifying with emulsifying machine to obtain composition.

(test example 24)

Mixing the water phase component and the powder component in refined water, heating to 70 deg.C, and performing ultrasonic treatment. Adding oil phase component heated to 70 deg.C and surfactant component, and emulsifying with emulsifying machine.

(test example 25)

Stirring the powder component and surfactant component in appropriate amount of ethanol, and volatilizing ethanol to obtain surfactant treated powder. Mixing the above powder and water phase components in purified water, heating to 70 deg.C, and performing ultrasonic treatment. Adding oil phase component heated to 70 deg.C, and emulsifying with emulsifying machine to obtain composition.

Evaluation method

Evaluation (1): emulsion stability (appearance)

The appearance of the emulsion was visually observed within 1 day after the preparation of the emulsion.

O: the sample was homogeneous and no oil-bleeding or powder aggregation was observed.

And (delta): the sample was substantially uniform and slightly oiled.

X: the sample was not uniform, or significant oil phase separation or powder aggregation was confirmed.

Evaluation (2): emulsion stability (emulsion particle)

When the sample is observed with an optical microscope,

o: the emulsified particles were uniform, and no aggregation or aggregation was observed.

And (delta): although the emulsified particles were substantially uniform, they were found to be slightly aggregated or aggregated.

X: the emulsified particles were not uniform, and significant aggregation or aggregation was observed.

[ TABLE 6 ]

[ TABLE 7 ]

As shown in table 7, test example 23, in which a specific cationic surfactant in a state of being dispersed in water was mixed with a powder component and then emulsified with an oil phase component, showed excellent emulsion stability.

On the other hand, in test example 24 in which the cationic surfactant was added at the time of emulsification of the aqueous phase and the oil phase without passing through the above-mentioned steps, stable emulsification and aggregation of oil droplets or powder were not confirmed. Further, the emulsion stability of test example 25, which was not treated with the powder and the cationic surfactant in water or separately treated in ethanol, was also poor.

Comparative test examples 23 and 24 show that stable emulsions were obtained by dispersing a specific cationic surfactant in water to form a lamellar liquid crystal, adsorbing the lamellar liquid crystal on the powder particles, and then emulsifying the lamellar liquid crystal. Further, it is clear from comparative test examples 23 and 25 that a composition having high emulsion stability can be easily prepared by treating the powder with a specific cationic surfactant which forms a lamellar liquid crystal in water.

50 parts by weight of a dispersion of the surface-treated powder obtained by each of the following methods and 50 parts by weight of an oil phase component (liquid paraffin) were mixed under heating at 70 ℃ to obtain a composition, and the emulsion stability of the obtained composition was evaluated.

(test example 26)

0.1 part by weight of dimethyldioctadecylammonium chloride and 6 parts by weight of silica-coated zinc oxide were dispersed in 100 parts by weight of water, and ultrasonic treatment was performed under heating.

(test example 27)

0.1 part by weight of stearic acid was dissolved in 100 parts by weight of ethanol, and 6 parts by weight of silica-coated zinc oxide was added thereto, followed by stirring and mixing under heating.

(test example 28)

0.1 part by weight of glycerin monostearate was uniformly dispersed in 100 parts by weight of water, and 6 parts by weight of silica-coated zinc oxide was added thereto and dispersed, followed by ultrasonic treatment under heating.

[ TABLE 8 ]

As shown in test example 26, an O/P/W emulsion composition having excellent stability can be obtained by emulsifying an oil phase component and a powder in a treated powder dispersion obtained by powder-treating dimethyl dioctadecyl ammonium chloride in water.

On the other hand, stearic acid, which is commonly used as a hydrophobizing agent for powder, is treated in ethanol because it is difficult to perform powder treatment in water in view of its properties (test example 27). Therefore, the dispersion of the treated powder cannot be directly emulsified with the oil phase component. When the treated powder was dispersed again in water and emulsified, the powder emulsification could be carried out, but the emulsion stability of the obtained composition was inferior to that of test example 26.

In addition, in test example 28, glycerin monostearate was treated as a powder in water, and powder emulsification was performed using this dispersion, but the emulsion stability of the obtained composition was inferior to that of test example 26.

From this fact, it is found that the oil-in-water type emulsion composition of the present invention can be obtained by using a cationic surfactant having 2 long-chain alkyl groups as a treatment agent for a powder at the time of emulsification, treating the powder in water, and directly mixing the obtained dispersion of the treated powder with an oil phase component. That is, the oil-in-water emulsion composition of the present invention uses a cationic surfactant having a specific structure as a powder treatment agent, and thus can be easily and continuously emulsified from the surface treatment of the powder to the emulsification with the powder, and has high emulsion stability.

The following examples are given as examples of the formulation of the oil-in-water emulsion composition of the present invention, but the present invention is not limited thereto. The oil-in-water emulsion compositions obtained by the following formulation examples all had high emulsion stability, low greasy feeling, and low skin irritation.

< formulation example 1> emulsion

(mass%)

Phase A

Squalane 4.0

Oleic acid oleyl ester 2.5

Evening primrose oil 0.2

Fragrance 0.1

Phase B

1, 3-butanediol 1.5

Ethanol 2.0

Hydrophobized silica 5.0

Dimethyldioctadecylammonium chloride 0.05

Proper amount of refined water

Phase C

Xanthan gum 0.1

Proper amount of refined water

Phase D

Carboxyvinyl Polymer 0.2

0.1 part of potassium hydroxide

L-arginine L-aspartate 0.01

Ethylenediaminetetraacetate 0.05

Proper amount of preservative

The rest of refined water

(preparation method)

Heating phase B to 70 deg.C, dispersing thoroughly with a mixer or ultrasonic waves, adding phase C, adding phase A, emulsifying with an emulsifying machine, and adding phase D to obtain emulsion.

< formulation example 2> ultraviolet protective emulsion

(mass%)

Phase A

Squalane 4.0

Octyl methoxycinnamate 8.0

Cyclopentadimethylsiloxane 5.0

Fragrance 0.1

Phase B

1, 3-butanediol 1.5

Ethanol 2.0

Silicon oxide coated Zinc oxide (30nm) 3.0

Diethyldioctadecylammonium chloride 0.015

Proper amount of refined water

Phase C

Succinoglycan 0.2

Glycerol 3.0

L-arginine L-aspartate 0.01

Ethylenediaminetetraacetate 0.05

Proper amount of preservative

The rest of refined water

(preparation method)

Heating phase B to 70 deg.C, dispersing with a mixer or ultrasonic wave, and adding uniformly dissolved phase C. Adding phase A heated to 70 deg.C into phase B heated to 70 deg.C, and emulsifying with emulsifying machine. It was cooled to give an emulsion.

< prescription example 3> Foundation make-up

(mass%)

Phase A

Cetyl alcohol 3.5

Deodorant lanolin 4.0

Jojoba oil 5.0

Vaseline 2.0

Squalane 6.0

Pyridoxine tripalmitate 0.1

Proper amount of preservative

Fragrance 0.3

Phase B

Mica 5.0

Dimethyldioctadecylammonium chloride 0.015

Proper amount of refined water

Phase C

Propylene glycol 10.0

Blended powder 12.0

Ethylenediaminetetraacetic acid trisodium 0.5

The rest of refined water

(preparation method)

Heating phase B to 70 deg.C, dispersing thoroughly with emulsifier, adding heated phase A, and emulsifying with emulsifier. Finally, phase C was added and the emulsion was cooled using a heat exchanger to obtain a foundation.

The oil-in-water emulsion compositions of formulation examples 1 to 3 were all excellent in emulsion stability and free from skin irritation or greasiness.

Example 2

The skin external preparation for sunscreen of the present invention is studied below. In the present example, "mass%" or "%" of the amount to be blended is indicated, and unless otherwise specified, it is indicated by mass% relative to the total amount of the composition.

First, the evaluation method used in this example will be described.

Evaluation (1): emulsion stability (emulsion particle)

When the appearance of the sample was observed with an optical microscope within 1 day after the preparation of the emulsion,

o: the emulsified particles were uniform and no aggregation or aggregation was observed.

And (delta): although the emulsified particles were substantially uniform, they were found to be slightly aggregated or aggregated.

X: the emulsified particles were not uniform, and significant aggregation or aggregation was observed.

Evaluation (2): rotation test

The sample was put into a 50ml sample tube (diameter: 3cm), rotated at 45rpm for 4 hours at room temperature, and the emulsion stability was evaluated by a microscope. The evaluation criteria are as follows.

O: the emulsified particles were uniform and no aggregation was observed.

And (delta): the emulsified particles were substantially uniform, but were confirmed to be slightly aggregated.

X: the emulsified particles were not uniform, and significant aggregation was confirmed.

Evaluation (3): tightness after use

The actual use test was conducted by 10 panelists for the presence or absence of a tight feeling after the use of the test specimen. The evaluation criteria are as follows.

Very good: 8 or more evaluators confirmed no tightness after use.

O: 6 or more and less than 8 evaluators confirmed no tightness after use.

And (delta): 3 or more and less than 6 evaluators confirmed no tightness after use.

X: less than 3 evaluators confirmed no tightness after use.

Evaluation (4): evaluation of greasy feeling at the time of coating

The actual use test of each sample was conducted by 10 special evaluators. The evaluation criteria are as follows.

Very good: the 8 or more evaluators confirmed that the coating had no greasy feeling.

O: 6 or more and less than 8 evaluators confirmed no greasy feeling in coating.

And (delta): 3 or more and less than 6 evaluators confirmed no greasy feeling in coating.

X: less than 3 evaluators confirmed no greasy feel in the application.

An external preparation for skin for sunscreen having a compounding composition shown in table 9 was prepared, and evaluation tests related to the above evaluations (1) to (4) were performed on each sample.

[ TABLE 9 ]

(preparation method)

Heating phase A to 70 deg.C, dispersing with ultrasonic wave, and adding uniformly dissolved phase B. Adding phase C heated to 70 deg.C into phase B heated to 70 deg.C, emulsifying with emulsifying machine, and cooling to room temperature.

As shown in table 9, test example 29 using the powder without the cationic surfactant incorporated therein had extremely poor emulsifiability. In addition, in test example 30 in which only the single-chain cationic surfactant was added, it was confirmed that the emulsion stability was lowered by the rotation. On the other hand, test example 31 in which the cationic surfactant having 2 long-chain alkyl groups was added showed excellent results in any of the items.

In test example 32 in which no powder component (silicon oxide-coated zinc oxide) was blended, the emulsion stability was extremely poor compared to test example 31, and in test example 33 in which no hydrophobized powder was included in the oil phase, a taut feel was observed after use, and stickiness was likely to occur during coating. It was confirmed that the tight feeling and the greasy feeling were remarkable in test example 34 in which the hydrophilic titanium dioxide was blended instead of the hydrophobized powder.

From this, it was confirmed that the external preparation for skin for sun protection of the present invention comprises: an oil-in-water emulsion composition comprising (a) a powder component, (b) a cationic surfactant having 2 alkyl chains with a carbon chain of 12 to 22 inclusive, (c) an oil phase component, and (d) an aqueous phase component, is provided with excellent emulsion stability. In addition, by blending the hydrophobized powder to the oil phase component, the feeling of tightness after use and the feeling of greasiness during coating are improved.

The effect of the amount of the surfactant added on the water resistance of the external skin preparation for sunscreen was evaluated. The evaluation method is as follows.

Evaluation (5): water resistance test

The external dose on the skin immediately after applying the sample to the arms of 10 evaluators and washing with a constant amount of running water was quantified by ethanol extraction, and the residual ratio (%) was calculated from the following equation.

Residual ratio (%) (external dose on skin after washing with water)/(external dose on skin before washing with water) × 100

Then, the calculated residual ratio was evaluated according to the following criteria.

The evaluation criteria of the "water resistance test" are as follows.

Very good: the residual rate is more than 90 percent

O: the residual rate is more than 60 percent and less than 90 percent

And (delta): the residue rate is more than 30 percent and less than 60 percent

X: the residue rate is lower than 30 percent

An external preparation for skin for sunscreen containing the compounding composition described in table 10 was prepared, and each sample was evaluated in relation to the above evaluation (5).

[ TABLE 10 ]

(preparation method)

Heating phase A to 70 deg.C, dispersing with ultrasonic wave, and adding uniformly dissolved phase B. Adding phase C heated to 70 deg.C into phase B heated to 70 deg.C, emulsifying with emulsifying machine, and cooling to room temperature.

As shown in table 10, the samples of test example 35, which contained no surfactant other than the specific cationic surfactant, were excellent in water resistance. When a water-soluble surfactant other than the specific cationic surfactant is used in combination, the water resistance can be maintained if the amount is extremely small (test example 36), and the water resistance of the sample tends to be inferior as the amount of the water-soluble surfactant used in combination increases.

Therefore, the external skin preparation for sunscreen of the present invention is preferably substantially free of (b) a water-soluble surfactant other than the cationic surfactant having 2 alkyl chains with carbon chains of 12 to 22 carbon atoms.

Next, in order to examine a preferable blending amount of the powder used for emulsification, an oil-in-water type sunscreen skin external preparation containing a blending composition described in table 11 was prepared, and evaluation tests relating to the above (1) to (4) were performed on each sample.

[ TABLE 11 ]

(preparation method)

Heating phase A to 70 deg.C, dispersing with ultrasonic wave, and adding uniformly dissolved phase B. Adding phase C heated to 70 deg.C into phase B heated to 70 deg.C, emulsifying with emulsifying machine, and cooling to room temperature.

As is clear from Table 11, the compositions of test examples 41 to 43 exhibited excellent emulsion stability, and neither a tight feeling nor a greasy feeling was observed. On the other hand, in test example 40 in which 0.5 mass% of the powder was blended, the emulsion stability was poor, and in example 44 in which 30 mass% of the powder was blended, the tight feeling and the greasy feeling were strong.

Therefore, the amount of the powder to be incorporated in the external preparation for skin for sun-screening of the present invention is preferably 1 to 20% by mass based on the total amount of the external preparation.

Then, in order to examine a preferable blending amount of the cationic surfactant having 2 long-chain alkyl groups, an oil-in-water type sunscreen skin external preparation having a blending composition described in table 12 was prepared, and evaluation tests related to the above evaluations (1) to (4) were performed on each sample.

[ TABLE 12 ]

(preparation method)

Heating phase A to 70 deg.C, dispersing with ultrasonic wave, and adding uniformly dissolved phase B. Adding phase C heated to 70 deg.C into phase B heated to 70 deg.C, emulsifying with emulsifying machine, and cooling to room temperature.

As shown in Table 12, the compositions of test examples 46 to 48 exhibited excellent emulsion stability, and neither a tight feeling nor a greasy feeling was observed. On the other hand, the emulsion stability of example 45 containing 0.0005 mass% of the cationic surfactant and that of test example 49 containing 1 mass% of the cationic surfactant were extremely poor.

Therefore, in the external skin preparation for sunscreen of the present invention, the amount of the cationic surfactant having 2 alkyl chains with a carbon chain of 12 to 22 is preferably 0.001 to 0.5% by mass based on the total amount of the components.

Further, an external preparation for skin for sunscreen containing the compounding composition described in table 13 was prepared, and evaluation tests related to the above evaluations (1) to (4) were performed on each sample.

[ TABLE 13 ]

(preparation method)

Heating phase A to 70 deg.C, dispersing with ultrasonic wave, and adding uniformly dissolved phase B. Adding phase C heated to 70 deg.C into phase B heated to 70 deg.C, emulsifying with emulsifying machine, and cooling to room temperature.

As shown in table 13, test examples 51 and 52 showed good results in both evaluation items. On the other hand, the emulsion stability of example 50 in which the cationic surfactant having a chain length of 10 was blended was poor, and as shown in test example 53, when the cationic surfactant having a chain length of 22 or more was blended, the emulsion stability during rotation was lowered, and the tense feeling and the greasy feeling were increased.

Therefore, in the external skin preparation for sunscreen of the present invention, the cationic surfactant preferably has a 2-alkyl chain length of 12 to 22.

Examples of the formulation of the external preparation for skin for sunscreen of the present invention are shown below, but the present invention is not limited thereto. The skin external preparations for sunscreen obtained by the following formulation examples were all high in emulsion stability and water resistance, low in tense and greasy feeling, and low in skin irritation.

< formulation example 1> sunscreen emulsion

(mass%)

Phase A

Squalane 4.0

Oleic acid oleyl ester 2.5

Sorbitan sesquioleate 0.8

Evening primrose oil 0.2

Hydrophobicized titanium dioxide 3.0

Fragrance 0.1

Phase B

1, 3-butanediol 1.5

Ethanol 2.0

Silicon oxide (10nm) 5.0

Dimethyldioctadecylammonium chloride 0.05

Proper amount of refined water

Phase C

Xanthan gum 0.1

Proper amount of refined water

Phase D

Carboxyvinyl Polymer 0.2

0.1 part of potassium hydroxide

L-arginine L-aspartate 0.01

Ethylenediaminetetraacetate 0.05

Proper amount of preservative

The rest of refined water

(preparation method)

Heating phase B to 70 deg.C, dispersing thoroughly with a mixer or ultrasonic waves, adding phase C, adding phase A, emulsifying with an emulsifying machine, and adding phase D to obtain emulsion.

< formulation example 2> ultraviolet protective emulsion

(mass%)

Phase A

Squalane 4.0

Octyl methoxycinnamate 8.0

Cyclopentadimethylsiloxane 5.0

Hydrophobized zinc oxide 5.0

Fragrance 0.1

Phase B

1, 3-butanediol 1.5

Ethanol 2.0

Silicon oxide coated Zinc oxide (30nm) 3.0

Diethyldioctadecylammonium chloride 0.015

Proper amount of refined water

Phase C

Succinoglycan 0.2

Glycerol 3.0

L-arginine L-aspartate 0.01

Ethylenediaminetetraacetate 0.05

Proper amount of preservative

The rest of refined water

(preparation method)

Heating phase B to 70 deg.C, dispersing with a mixer or ultrasonic wave, and adding uniformly dissolved phase C. Adding phase A heated to 70 deg.C into phase B heated to 70 deg.C, and emulsifying with emulsifying machine. It was cooled to give an emulsion.

< prescription example 3> sunscreen foundation

(mass%)

Phase A

Cetyl alcohol 3.5

Deodorant lanolin 4.0

Jojoba oil 5.0

Vaseline 2.0

Squalane 6.0

Pyridoxine tripalmitate 0.1

Hydrophobicized titanium dioxide 3.0

Proper amount of preservative

Fragrance 0.3

Phase B

Mica 5.0

Dimethyldioctadecylammonium chloride 0.015

Proper amount of refined water

Phase C

Propylene glycol 10.0

Blended powder 12.0

Ethylenediaminetetraacetic acid trisodium 0.5

The rest of refined water

(preparation method)

Heating phase B to 70 deg.C, dispersing thoroughly with emulsifier, adding heated phase A, and emulsifying with emulsifier. Finally, phase C was added and the emulsion was cooled using a heat exchanger to obtain a foundation.

Example 3

The cosmetic composition of the present invention was studied. In the present example, "mass%" or "%" of the amount to be blended means mass% based on the total amount of the composition unless otherwise specified.

First, the evaluation method used in this example will be described.

Evaluation (1): formulation stability

The appearance of the prepared emulsion after storage at 50 ℃ for 1 month was visually observed, and the state of the emulsion was observed with an optical microscope. The evaluation criteria are as follows.

O: the appearance was not changed, and the emulsion particles were uniform, and no aggregation or aggregation was observed.

And (delta): although no change in appearance was observed, aggregation, and the like of the emulsified particles were observed.

X: the oil phase separation was confirmed in appearance.

Evaluation (2): greasy feeling after use

The test piece had no greasy feeling after use, and the actual use test was carried out by 10 panelists. The evaluation criteria are as follows.

Very good: the 8 or more evaluators confirmed no greasy feeling after use.

O: no greasy feeling after use was confirmed by 6 or more and less than 8 evaluators.

And (delta): 3 or more and less than 6 evaluators confirmed no greasy feeling after use.

X: less than 3 evaluators confirmed no greasy feeling after use.

Evaluation (3): evaluation of Water tenderness at the time of coating

The actual use test of each sample was conducted by 10 special evaluators. The evaluation criteria are as follows.

Very good: the tenderness of the coating was confirmed by 8 or more evaluators.

O: tender in coating was confirmed by 6 or more evaluators and 8 or less evaluators.

And (delta): tenderness during application was confirmed by 3 or more and less than 6 evaluators.

X: less than 3 evaluators confirmed tenderness in the coating.

Oil-in-water cosmetic compositions containing the compounding compositions shown in table 14 were prepared, and the respective samples were evaluated in relation to the above-mentioned evaluations (1) to (3).

[ TABLE 14 ]

(preparation method)

Phase A was heated to 70 ℃ and dispersed by sonication. The mixture to which phase B was added, emulsified with an emulsifying machine, and cooled.

As shown in table 14, test example 54 in which only the hydrophilic powder was blended without containing the cationic surfactant and test example 55 in which only the cationic surfactant was blended were extremely poor in emulsifiability. The formulation of test example 56 in which the cationic surfactant and the hydrophilic powder were blended was excellent in stability, non-greasy feeling, and tender feeling.

The composition of test example 57 emulsified with the hydrocarbon surfactant had poor formulation stability, exhibited greasy feel, and did not feel tender. The stability of the formulation of test example 58 using the silicone surfactant was also improved when the hydrocarbon surfactant was used, and the greasy and tender feeling was still poor.

Thus, the cosmetic composition of the present invention comprises: an oil-in-water emulsion composition comprising (a) a powder component, (b) a cationic surfactant having 2 alkyl chains with carbon chains of 12 to 22 inclusive, (c) an oil phase component, and (d) an aqueous phase component was confirmed to be imparted with excellent emulsion stability. In addition, by blending the hydrophobized powder to the oil phase component, the feeling of tightness after use and the feeling of greasiness during coating are improved.

The following studies were made on the oil phase component of the cosmetic composition of the present invention.

That is, oil-in-water type cosmetic compositions containing the compounding compositions shown in table 15 were prepared, and the respective samples were evaluated in relation to the above evaluations (2) and (3).

[ TABLE 15 ]

(preparation method)

Phase A was heated to 70 ℃ and dispersed by sonication. The mixture to which phase B was added, emulsified with an emulsifying machine, and cooled.

As shown in table 15, the compositions of test examples 59 to 62 containing the silicone oil in an amount of 50 mass% or more based on the oil phase component in the oil phase had no greasy feeling and had a water tenderness. In particular, when a silicone acrylate having a specific structure (test example 59), a silicone-modified glycerin having both terminals (test example 60), or both (test example 61) are blended, a significant improvement in usability is confirmed. On the other hand, in test example 63 in which the amount of the silicone oil blended is less than 50% by mass based on the oil phase component, the sample was extremely greasy and did not feel tender.

As described above, the cosmetic composition of the present invention preferably contains 50% by mass or more of a silicone oil with respect to the oil phase component, and particularly preferably contains a silicone acrylate having a specific structure and/or silicone-modified glycerin at both ends, from the viewpoint of improving the usability.

The effect of the amount of the surfactant added on the water resistance of the cosmetic composition was evaluated. The evaluation method is as follows.

Evaluation (4): water resistance test

The external dose on the skin immediately after applying the sample to the arms of 10 evaluators and washing with a constant amount of running water was quantified by ethanol extraction, and the residual ratio (%) was calculated from the following equation.

Residual ratio (%) (external dose on skin after washing with water)/(external dose on skin before washing with water) × 100

Then, the calculated residual ratio was evaluated according to the following criteria.

The evaluation criteria of the "water resistance test" are as follows.

Very good: the residual rate is more than 90 percent

O: the residual rate is more than 60 percent and less than 90 percent

And (delta): the residue rate is more than 30 percent and less than 60 percent

X: the residue rate is lower than 30 percent

Cosmetic compositions containing the compounding compositions shown in table 16 were prepared, and the evaluation related to the above evaluation (4) was performed on each sample.

[ TABLE 16 ]

(preparation method)

Phase A was heated to 70 ℃ and dispersed by sonication. The mixture to which phase B was added, emulsified with an emulsifying machine, and cooled.

As shown in table 16, the composition of test example 64, which contained no surfactant other than dimethyldioctadecylammonium chloride, was excellent in water resistance. On the other hand, when the surfactant and the other water-soluble surfactant (octadecyl trimethyl ammonium chloride) are used in combination, if the amount of the other water-soluble surfactant is very small, 0.01 mass% of the surfactant exhibits high water resistance (test example 65), and the water resistance tends to decrease as the amount of the water-soluble surfactant used in combination increases (test examples 66 to 68).

Therefore, it is preferable that the cosmetic composition of the present invention does not substantially contain (b) a water-soluble surfactant other than the cationic surfactant having an alkyl chain of 2 carbon chains of 12 to 22.

Then, in order to examine the preferable blending amount of the powder components during emulsification, cosmetic compositions containing the blending compositions shown in table 17 were prepared, and the evaluation tests related to the above (1) to (3) were performed on each sample.

[ TABLE 17 ]

(preparation method)

Phase A was heated to 70 ℃ and dispersed by sonication. The mixture to which phase B was added, emulsified with an emulsifying machine, and cooled.

As shown in Table 17, the cosmetic compositions of test examples 70 to 72 had excellent preparation stability, and were not greasy and had excellent tenderness. On the other hand, the formulation stability of test example 69 in which the powder component (silicon oxide-coated zinc oxide) was mixed in an amount of 0.5 mass% during emulsification was poor, and the composition of example 73 in which 30 mass% of the powder component was mixed was highly greasy and was deficient in water tenderness.

Therefore, the amount of the powder component to be blended in the cosmetic composition of the present invention is preferably 1 to 20% by mass based on the composition.

Next, in order to examine a preferable blending amount of the cationic surfactant having 2 long-chain alkyl groups, cosmetic compositions containing the blending compositions described in table 18 were prepared, and evaluation tests related to the above evaluations (1) to (3) were performed on each sample.

[ TABLE 18 ]

(preparation method)

Phase A was heated to 70 ℃ and dispersed by sonication. The mixture to which phase B was added, emulsified with an emulsifying machine, and cooled.

As shown in Table 18, the cosmetic compositions of test examples 75 to 77 exhibited excellent preparation stability, no greasiness, and excellent tenderness. On the other hand, the formulations of example 74 containing 0.0005 mass% of dimethyldioctadecylammonium chloride and of test example 78 containing 1 mass% were significantly degraded in stability.

Therefore, the cosmetic composition of the present invention preferably contains 0.001 to 0.5% by mass of a cationic surfactant having 2 alkyl chains with a carbon chain of 12 to 22 inclusive, based on the composition.

Then, cosmetic compositions containing the compounding compositions shown in table 19 were prepared, and evaluation tests for the above evaluations (1) to (3) were performed on the respective samples.

[ TABLE 19 ]

(preparation method)

Phase A was heated to 70 ℃ and dispersed by sonication. The mixture to which phase B was added, emulsified with an emulsifying machine, and cooled.

As shown in table 19, the compositions of test examples 80 and 81 showed good results in any of the evaluation items. On the other hand, the composition of example 79 using dimethyldialkylammonium chloride having an alkyl chain length of 10 had extremely low formulation stability and was not durable. The composition of example 82 having an alkyl chain length of 22 had excellent formulation stability, but was slightly greasy and did not feel tender.

Therefore, in the cosmetic composition of the present invention, the cationic surfactant preferably has a 2-alkyl chain length of 12 to 22.

Examples of the formulation of the cosmetic composition of the present invention will be described below, but the present invention is not limited thereto. The cosmetic compositions obtained by the following formulation examples all had high preparation stability, low greasy feeling, and water-tenderness.

< formulation example 1> oil-in-water type emulsion foundation

(mass%)

(1) Hydrophobized titanium dioxide 10.0

(2) Hydrophobicized talc 3.0

(3) Hydrophobized yellow iron oxide 0.8

(4) Hydrophobized black iron oxide 0.15

(5) Hydrophobization of Red iron oxide 0.36

(6) Both terminal organosilicon-modified glycerin represented by the general formula (II) 3.0

(7) Polyoxyethylene-methylpolysiloxane copolymer 0.5

(8) Decamethylcyclopentasiloxane 10.0

(9) Squalane 4.0

(10) Dipropylene glycol 5.0

(11) Silicic anhydride 3.0

(12) Diethyldioctadecylammonium chloride 0.03

(13) Proper amount of refined water

(14) Xanthan gum 0.3

(15) Carboxylic acid methyl cellulose 0.2

(16) Ethanol 2.0

(17) Ethylenediaminetetraacetate 0.1

(18) Proper amount of preservative

(19) The rest of refined water

(preparation method)

Mixing (10) - (13), heating to 70 deg.C, sufficiently dispersing with emulsifying homogenizer or ultrasonic wave, adding oil phases (1) - (9) dispersed and crushed in advance with bead mill, emulsifying with emulsifying machine, adding (14) - (19), and uniformly dispersing to obtain oil-in-water emulsified foundation.

< formulation example 2> oil-in-water type emulsion foundation

(mass%)

(1) Hydrophobized titanium dioxide 10.0

(2) Hydrophobicized talc 3.0

(3) Hydrophobized yellow iron oxide 0.8

(4) Hydrophobized black iron oxide 0.15

(5) Hydrophobization of Red iron oxide 0.36

(6) Both terminal organosilicon-modified glycerin represented by the general formula (II) 3.0

(7) Polyoxyethylene-methylpolysiloxane copolymer 0.5

(8) Decamethylcyclopentasiloxane 15.0

(9) Methoxy cinnamic acid octyl ester 5.0

(10) Ochrinklin 2.0

(11) Glycerol 3.0

(12)1, 3-butanediol 4.0

(13) Silicon oxide coated Zinc oxide (30nm) 5.0

(14) Dimethyldioctadecylammonium chloride 0.05

(15) Proper amount of refined water

(16) Succinoglycan 0.3

(17) Carboxylic acid methyl cellulose 0.2

(18) Proper amount of preservative

(19) The rest of refined water

(preparation method)

Mixing (11) - (15), heating to 70 deg.C, dispersing thoroughly with emulsifying homogenizer or ultrasonic wave, slowly adding oil phase (1) - (10) dispersed with bead mill, emulsifying with emulsifying machine, adding (16) - (20), and dispersing uniformly to obtain oil-in-water emulsion foundation.

< formulation example 3> oil-in-water type gel foundation

(mass%)

(1) Hydrophobized titanium dioxide 10.0

(2) Hydrophobized yellow iron oxide 0.8

(3) Hydrophobized black iron oxide 0.15

(4) Hydrophobization of Red iron oxide 0.36

(5) Silicone acrylate 1.0 represented by the general formula (I)

(6) Polyoxyethylene-methylpolysiloxane copolymer 0.5

(7) Isostearic acid 0.2

(8) Decamethylcyclopentasiloxane 12.0

(9) Cetyl octanoate 3.0

(10) Glycerol 3.0

(11) Dipropylene glycol 4.0

(12) Silica-coated titanium dioxide (10nm) 3.0

(13) Dimethyldioctadecylammonium chloride 0.15

(14) Proper amount of refined water

(15) Xanthan gum 0.2

(16) Agar powder 1.5

(17) Ethylenediaminetetraacetate 0.1

(18) Proper amount of preservative

(19) The rest of refined water

(preparation method)

Mixing (11) - (14), heating to 70 deg.C, dispersing thoroughly with emulsifying homogenizer or ultrasonic wave, slowly adding oil phase (1) - (10) dispersed and broken with bead mill, and emulsifying with emulsifying machine. Then, (15) to (19) which had been uniformly dispersed at 90 ℃ in advance and then cooled were added to the mixture to obtain an oil-in-water gel foundation.

Example 4

The following studies were made on the hair styling cosmetic of the present invention. The term "mass%" or "%" as used herein means the mass% of the total composition unless otherwise specified.

First, the evaluation method used in this example will be described.

Evaluation (1): emulsion stability (emulsion particle)

When the appearance of the sample was observed with an optical microscope within 1 day after the preparation of the emulsion,

o: the emulsified particles were uniform and no aggregation or aggregation was observed.

And (delta): although the emulsified particles were substantially uniform, they were found to be slightly aggregated or aggregated.

X: the emulsified particles were not uniform, and significant aggregation or aggregation was observed.

Evaluation (2): setting force

The setting force of the test specimen was subjected to an actual use test by 10 special evaluators. The evaluation criteria are as follows.

Very good: more than 8 evaluators confirmed that natural style with natural hair flow was maintained.

O: more than 6 and less than 8 evaluators confirmed that natural style with natural hair flow was maintained.

And (delta): more than 3 and less than 6 evaluators confirmed that natural style with natural hair flow was maintained.

X: less than 3 evaluators confirmed that natural style with natural hair flow was maintained.

Evaluation (3): moisture resistance

After applying a sample to a hair bundle and drying the hair in a natural state, the hair was stored in a container adjusted to a relative humidity of 90% and 25 ℃ for 24 hours and then taken out, and the shape and texture thereof were evaluated functionally by 10 evaluators, and the evaluation was performed based on the following criteria.

Very good: more than 8 evaluators judged to have moisture resistance.

O: the moisture resistance was judged by 6 or more and less than 8 evaluators.

And (delta): the moisture resistance was judged by 3 or more and less than 6 evaluators.

X: less than 3 evaluators judged moisture resistance.

Evaluation (4): evaluation of greasy feeling at the time of coating

The actual use test of each sample was conducted by 10 special evaluators. The evaluation criteria are as follows.

Very good: the 8 or more evaluators confirmed that the coating had no greasy feeling.

O: 6 or more and less than 8 evaluators confirmed no greasy feeling in coating.

And (delta): 3 or more and less than 6 evaluators confirmed no greasy feeling in coating.

X: less than 3 evaluators confirmed no greasy feel in the application.

Hair cosmetic preparations for hair styling containing the blend compositions shown in table 20 were prepared, and the evaluation tests related to the above-described evaluations (1) to (4) were performed on the respective samples.

[ TABLE 20 ]

(preparation method)

Phase A was heated to 70 ℃ and dispersed by sonication. Adding phase B heated to 80 deg.C, emulsifying with emulsifying machine, and cooling.

As shown in table 20, test example 83 in which the hydrophilic powder (silica-coated titanium oxide, silica) was emulsified and test example 84 in which the hydrophilic powder (silica-coated titanium oxide, silica) was emulsified with dimethyldioctadecylammonium chloride were all extremely poor in emulsion stability. On the other hand, test example 85 in which emulsification was performed using both dimethyl dioctadecyl ammonium chloride and hydrophilic powder showed high emulsion stability, and good usability in terms of setting power, moisture resistance and no greasy.

In addition, the composition of test example 86 emulsified with only PEG-60 hydrogenated castor oil as the hydrocarbon surfactant had poor emulsion stability and insufficient usability.

Therefore, the hair cosmetic for styling of the present invention preferably contains: an oil-in-water emulsion composition comprising (a) a powder component, (b) a cationic surfactant having 2 alkyl chains with a carbon chain of 12 to 22 inclusive, (c) an oil phase component, and (d) an aqueous phase component.

Then, in order to examine the preferable blending amount of the powder components during emulsification, hair cosmetic preparations for hair styling containing the blending compositions shown in table 21 were prepared, and the evaluation tests related to the above (1) to (4) were performed on each sample.

[ TABLE 21 ]

(preparation method)

Phase A was heated to 70 ℃ and dispersed by sonication. Adding phase B heated to 80 deg.C, emulsifying with emulsifying machine, and cooling.

As shown in table 21, the hair cosmetic compositions for styling of test examples 88 to 90 exhibited excellent emulsion stability, and also exhibited high evaluations in terms of styling power, moisture resistance, and non-greasy feeling. On the other hand, the emulsion stability of test example 87 in which 0.5 mass% of the powder component (silicon oxide-coated zinc oxide, silicon oxide) was added during the emulsion was poor, and the composition of example 91 in which 30 mass% of the powder component was added was significantly poor in usability.

Therefore, the amount of the powder component to be blended in the hair cosmetic for styling of the present invention is preferably 1 to 20% by mass based on the composition.

Next, in order to examine a preferable blending amount of the cationic surfactant having 2 long-chain alkyl groups, hair styling cosmetics having a blending composition described in table 22 were prepared, and evaluation tests relating to the above evaluations (1) to (4) were performed on each sample.

[ TABLE 22 ]

(preparation method)

Phase A was heated to 70 ℃ and dispersed by sonication. Adding phase B heated to 80 deg.C, emulsifying with emulsifying machine, and cooling.

As shown in table 22, the hair styling cosmetics of test examples 93 to 95 exhibited high emulsion stability and also excellent styling power, moisture resistance and greasy feeling. On the other hand, example 92, in which dimethyldioctadecylammonium chloride was added in an amount of 0.0005 mass%, was poor in emulsion stability, and test example 96, in which the amount was 1 mass%, was poor in both emulsion stability and usability.

Therefore, in the hair cosmetic composition for styling of the present invention, it is preferable to blend 0.001 to 0.5% by mass of a cationic surfactant having 2 alkyl chains with a carbon chain of 12 or more and 22 or less with respect to the composition.

Then, hair cosmetic preparations for hair styling containing the blend compositions shown in table 23 were prepared, and the respective samples were subjected to the evaluation tests related to the above evaluations (1) to (4).

[ TABLE 23 ]

(preparation method)

Phase A was heated to 70 ℃ and dispersed by sonication. Adding phase B heated to 80 deg.C, emulsifying with emulsifying machine, and cooling.

As shown in table 23, the compositions of test examples 98 and 99 showed good results in both evaluation items. On the other hand, the composition of example 97 using dimethyldialkylammonium chloride with an alkyl chain length of 10 had very low emulsion stability and was not durable. The composition of example 100 having an alkyl chain length of 22 had insufficient formulation stability and usability.

Therefore, in the hair cosmetic for styling of the present invention, the alkyl chain length of 2 of the cationic surfactant is preferably 12 to 22.

Then, in order to examine the preferable oily components of the present invention, hair styling cosmetics containing the blend compositions shown in table 24 were prepared, and the respective samples were subjected to the evaluation tests related to the above evaluations (2) to (4).

[ TABLE 24 ]

(preparation method)

Phase A was heated to 70 ℃ and dispersed by sonication. Adding phase B heated to 80 deg.C, emulsifying with emulsifying machine, and cooling.

As shown in table 24, test example 101 in which only a solid oil was blended as an oil phase component had a high greasy feeling, and test example 102 in which only a liquid oil was blended had a poor fixing ability. On the other hand, the composition of test example 103 in which the solid oil component and the liquid oil component were mixed in appropriate amounts showed excellent results in all items.

On the other hand, test examples 104 and 105 in which a large amount of solid oil or liquid oil was blended gave results inferior in usability to test example 103.

Therefore, in the hair cosmetic composition for styling of the present invention, it is preferable to blend a solid oil component and a liquid oil component in appropriate amounts as the oil phase component.

Further, as a result of further investigation, the amounts of the solid oil and the liquid oil to be blended are preferably 1 to 30% by mass, respectively, based on the total amount of the components.

Examples of the formulation of the hair cosmetic for permanent set of the present invention will be described below, but the present invention is not limited thereto. The hair cosmetic for setting obtained from the following formulation examples was high in emulsion stability, low in greasy feeling, and excellent in setting power and moisture resistance.

< prescription example 1> Hair wax

(mass%)

(A phase)

Liquid paraffin 10.0

Microcrystalline wax 5.0

Carnauba wax 5.0

Pentaerythritol tetra 2-ethylhexanoate 3.0

(phase B)

1, 3-butanediol 7.0

Silicon oxide coated Zinc oxide (30nm) 3.0

Diethyldioctadecylammonium chloride 0.03

Silicon oxide (10nm) 1.0

Proper amount of refined water

(C phase)

Triethanolamine 0.3

Ethanol 2.0

Carboxyvinyl Polymer 0.2

Proper amount of p-hydroxybenzoate

Proper amount of 3 sodium ethylene diamine tetraacetate

The rest of refined water

(preparation method)

Phase B was heated to 70 ℃ and dispersed by sonication. Adding phase A heated to 80 deg.C, emulsifying with emulsifying machine, adding phase C, and cooling.

< prescription example 2> Hair wax

(mass%)

(A phase)

Liquid paraffin 10.0

Microcrystalline wax 10.0

Dimethylpolysiloxane 4.0

Stearyl alcohol 2.0

Carnauba wax 3.0

Pentaerythritol tetra 2-ethylhexanoate 2.0

Proper amount of perfume

(phase B)

Propylene glycol 8.0

Silicon oxide coated Zinc oxide (30nm) 2.0

Diethyldioctadecylammonium chloride 0.07

Silicon oxide (10nm) 2.0

Proper amount of refined water

Phase C

Succinoglycan 0.2

Glycerol 3.0

L-arginine L-aspartate 0.01

Ethylenediaminetetraacetate 0.05

Proper amount of preservative

The rest of refined water

(preparation method)

Phase B was heated to 70 ℃ and dispersed by sonication. Adding phase A heated to 80 deg.C, emulsifying with emulsifying machine, adding phase C, and cooling.

Claims (16)

1. An oil-in-water emulsion composition comprising:

(a)1 to 20 mass% of a powder component,

(b)0.001 to 0.5 mass% of a cationic surfactant having 2 alkyl chains with a carbon chain of 12 to 22 inclusive,

(c) Oil phase components,

(d) Contains 1 or more than 2 kinds of water phase components selected from succinoglycan, xanthan gum and acrylamide,

has a structure in which the powder particles of (a) are adsorbed on oil droplets dispersed in an aqueous phase, and,

a surfactant is not contained at all except the cationic surfactant of (b),

and the oil-in-water emulsion composition is prepared by a preparation method comprising the following steps (A) and (B),

(A) a step of dispersing a powder component and a cationic surfactant having 2 alkyl chains with carbon chains of 12 to 22 inclusive in an aqueous phase component,

(B) And (A) mixing the dispersion with an oil phase component.

2. The oil-in-water emulsion composition according to claim 1, wherein the cationic surfactant (b) is adsorbed on the powder particles of (a).

3. The oil-in-water emulsion composition according to claim 1 or 2, wherein the cationic surfactant of (b) is contained in an amount of 0.001 to 0.1% by mass in total.

4. The oil-in-water type emulsion composition according to claim 1 or 2, wherein the cationic surfactant in (b) is dimethyldialkylammonium chloride.

5. The method for producing an oil-in-water emulsion composition according to claim 1 or 2, comprising the following steps (A) and (B),

(A) a step of dispersing a powder component and a cationic surfactant having 2 alkyl chains with carbon chains of 12 to 22 inclusive in an aqueous phase component,

(B) And (A) mixing the dispersion with an oil phase component.

6. An external skin preparation for sunscreen comprising the oil-in-water emulsion composition according to claim 1 or 2, and further comprising a hydrophobized powder dispersed in the oil phase component of (c).

7. The external preparation for skin as claimed in claim 6, which is characterized by containing no surfactant other than the cationic surfactant of (b).

8. The external preparation for skin as claimed in claim 6 or 7, wherein the hydrophobized powder contains hydrophobized particulate titanium dioxide and/or hydrophobized particulate zinc oxide.

9. A cosmetic composition comprising the oil-in-water emulsion composition according to claim 1 or 2, further comprising a hydrophobized powder dispersed in the oil phase component of (c), wherein 50% by mass or more of the oil phase component is a silicone oil.

10. The cosmetic composition according to claim 9, which is completely free of a surfactant other than the cationic surfactant of (b).

11. The cosmetic composition according to claim 9 or 10, wherein the hydrophobized powder contains 1 or 2 or more kinds selected from the group consisting of hydrophobized fine particulate titanium dioxide, red iron oxide, yellow iron oxide, black iron oxide, and aluminum oxide.

12. The cosmetic composition according to claim 9 or 10, which comprises 1 or 2 or more silicone acrylates represented by the following general formula (I),

(formula 1)

In the formula, R is alkyl with 10-20 carbon atoms, a + b + c is 1, a, b and c are all 0.2 or more, and d is an integer of 5-100.

13. The cosmetic composition according to claim 9 or 10, which comprises 1 or 2 or more kinds of both terminal silicone-modified glycerin represented by the following general formula (II),

(formula 2)

In the formula, R1 is a C1-12 linear or branched alkyl group or a phenyl group, R2 is a C2-11 alkylene group, m is 10-120, and n is 1-11.

14. A hair cosmetic composition for styling, comprising the oil-in-water emulsion composition according to claim 1 or 2, wherein the oil phase component (c) contains 1 to 30% by mass of a solid oil component and 1 to 30% by mass of a liquid oil component.

15. The hair cosmetic for styling as claimed in claim 14, characterized in that a surfactant is not contained at all except the cationic surfactant of (b).

16. The hair cosmetic for permanent set according to claim 14, characterized by containing silicon oxide as the powder component of (a).