Oil-in-water emulsified cosmetic

Abstract

The present application aims to provide an oil-in-water emulsified base which is excellent in powder dispersibility, particularly vibration stability, even when a high amount of a UV scattering agent and a pigment is incorporated into a cosmetic base having a reduced amount of a silicone compound. The present application provides an oil-in-water emulsified cosmetic characterized by comprising: (A) a pigment surface-treated with a surface treatment agent containing glutamic acid or aspartic acid acylated with a saturated aliphatic acid having a carbon number of 8 to 14 or a salt thereof, (B) an oil component, (C) a hydrophobic UV scattering agent, and (D) a water-soluble alkyl-substituted polysaccharide derivative, wherein the amount of the UV absorber is less than 1 mass% relative to the total amount of the cosmetic, the amount of the silicone oil is 10 mass% or less relative to the total amount of the cosmetic, and the (A) and (C) components are dispersed in the oil phase.

Description

TECHNICAL FIELD

[0001] The present application relates to an oil-in-water emulsified cosmetic which can stably incorporate a UV scattering agent and a pigment in a cosmetic base with reduced amount of silicone compound. BACKGROUND

[0002] Silicone compounds such as silicone oil have characteristics of high water repellency, no stickiness, light use touch, and good spreading on the skin, and have effects of improving water resistance, use feeling, and dispersibility of other incorporated ingredients of the cosmetic in which they are incorporated. In addition, silicone compounds are widely used as surface treatment agents for powder ingredients.

[0003] Although silicone compounds have the above-mentioned advantages, they have a problem that their high water repellency makes it difficult to wash off the cosmetic with water, and poor washability. In addition, silicone compounds are generally not biodegradable, and thus are long-term accumulated in the environment, and there is a concern that they pollute the environment and disturb the ecosystem. Therefore, in recent years, cosmetics not incorporating silicone compounds, which are called "silicone-free", have attracted attention.

[0004] However, if the silicone compounds which contribute to the improvement of the dispersibility of other incorporated ingredients such as powders in the conventional cosmetics are removed, there is a problem that it becomes difficult to maintain the stability of the cosmetic and the like.

[0005] On the other hand, in order to protect the skin from the damage of ultraviolet rays, a UV absorbing agent and a UV scattering agent are generally incorporated in cosmetics. In general, an organic compound such as ethylhexyl methoxy cinnamate and octocrylene is used as the UV absorbing agent, and an inorganic powder ingredient such as titanium dioxide and zinc oxide is used as the UV scattering agent.

[0006] The UV absorbing agent has advantages of high transparency, good spreading on the skin, and not easily destroyed by sweat, but since it prevents the influence of ultraviolet rays by converting ultraviolet rays into heat energy or other energy, users with sensitive skin sometimes feel irritation. Therefore, there is a demand for so-called "non-chemical" cosmetics which do not use a UV absorbing agent but obtain a UV protection effect by a UV scattering agent.

[0007] For example, Patent Literature 1 proposes an oil-in-water emulsified cosmetic in which a metal soap formed from a higher fatty acid and a divalent metal is used as a surface treatment agent for powder, so that the powder dispersibility and use feeling are good.

[0008] However, the cosmetic described in Patent Literature 1 does not study whether sufficient stability can be obtained in the case where the cosmetic is subjected to vibration such as when it is carried on the body.

[0009] PRIOR ART DOCUMENTS

[0010] Patent Literature

[0011] Patent Literature 1: International Publication No. 2017 / 006488 SUMMARY

[0012] Problem to be solved by the invention

[0013] An object of the present application is to provide an oil-in-water emulsion base which is excellent in powder dispersibility, particularly vibration stability, even when a high amount of an ultraviolet scattering agent and a pigment is incorporated in a cosmetic base in which the amount of an organic silicon compound to be incorporated is reduced.

[0014] Solution to the problem

[0015] The present inventors have intensively studied to solve the above problem and as a result, found that by surface-treating a pigment incorporated in an oil phase with a surface-treating agent containing acylated glutamic acid or aspartic acid or a salt thereof with a saturated aliphatic acid having a carbon number of 8 to 14 and incorporating a water-soluble alkyl-substituted polysaccharide derivative, the dispersibility of a powder in an oil phase as an internal phase is significantly improved even without incorporating an organic silicon compound, thereby completing the present application.

[0016] That is, the present application provides an oil-in-water emulsion cosmetic, characterized by comprising:

[0017] (A) a pigment surface-treated with a surface-treating agent containing acylated glutamic acid or aspartic acid or a salt thereof with a saturated aliphatic acid having a carbon number of 8 to 14,

[0018] (B) an oil component,

[0019] (C) a hydrophobic ultraviolet scattering agent, and

[0020] (D) a water-soluble alkyl-substituted polysaccharide derivative,

[0021] wherein

[0022] the amount of the ultraviolet absorber is less than 1 mass% relative to the total amount of the cosmetic,

[0023] the amount of the silicone oil is 10 mass% or less relative to the total amount of the cosmetic,

[0024] the above (A) and (C) components are dispersed in the oil phase.

[0025] Effects of the invention

[0026] The cosmetic of the present application, by adopting the above constitution, can improve the vibration stability and emulsion stability of the emulsified base agent with high pigment and ultraviolet scattering agent even without the organic silicon compound. Thus, a non-organic silicon color cosmetic suitable for carrying around can be achieved. In addition, according to the present application, sufficient ultraviolet protection effect can be obtained by the high ultraviolet scattering agent even without the ultraviolet absorber, thus a non-chemical cosmetic can be achieved. DETAILED DESCRIPTION

[0027] The cosmetic of the present application is characterized by comprising: (A) a pigment surface-treated with a surface treatment agent containing acylated glutamic acid or aspartic acid with a saturated aliphatic acid having a carbon number of 8 to 14 or a salt thereof, (B) an oil component, (C) a hydrophobic ultraviolet scattering agent, and (D) a water-soluble alkyl-substituted polysaccharide derivative. Each component constituting the cosmetic of the present application is described below.

[0028] (A) Pigment

[0029] The (A) pigment (hereinafter sometimes referred to as "(A) component") to be compounded in the cosmetic of the present application refers to an inorganic pigment surface-treated with a surface treatment agent containing acylated glutamic acid or aspartic acid with a saturated aliphatic acid having a carbon number of 8 to 14 or a salt thereof. By using a pigment surface-treated with these specific treatment agents, a cosmetic with excellent powder dispersibility and stability over time is obtained. As the surface treatment agent of the pigment of the present application, only acylated glutamic acid or aspartic acid with a saturated aliphatic acid having a carbon number of 8 to 14 or a salt thereof can be used, or other compounds usually used as a surface treatment agent for a powder can be further contained on the basis of acylated glutamic acid or aspartic acid with a saturated aliphatic acid having a carbon number of 8 to 14 or a salt thereof.

[0030] As specific examples of the pigment, red iron oxide (red ochre), iron titanate, γ-iron oxide, yellow iron oxide, yellow ocher, black iron oxide, carbon black, titanium suboxide, manganese violet, cobalt violet, chromium oxide, chromium hydroxide, cobalt titanate, ultramarine, Prussian blue, etc. can be listed. Among them, as the pigment of the present application, pigment-grade iron oxide such as yellow iron oxide, red iron oxide, black iron oxide, pigment-grade titanium oxide, etc. are preferably used. Here, pigment-grade refers to an average particle diameter in the order of 100 nm to 1 μm.

[0031] "Glutamic acid or aspartic acid, or their salts, that have been acylated with saturated fatty acids having 8 to 14 carbon atoms" refers to compounds or their salts in which an acyl group, specifically a saturated fatty acid having 8 to 14 carbon atoms, is condensed onto the amino group of glutamic acid or aspartic acid. Examples of saturated fatty acids having 8 to 14 carbon atoms include caprylic acid, lauric acid, and myristic acid. Examples of the "acyl group" include caprylyl, lauroyl, and myristic. The "salt" can be selected from alkali metal salts such as sodium and potassium, or alkaline earth metal salts, with sodium salts being preferred. Specific examples of acylated amino acids include sodium lauroyl glutamate and sodium lauroyl aspartate.

[0032] In addition to the acylated glutamic acid or aspartic acid or their salts described above, the surface treatment agent in this invention may also include other treatment agents. Examples of other treatment agents include "amino acids," "esters," and "metal complexes of esters." "Amino acids" are not particularly limited, but are preferably selected from aspartic acid, glutamic acid, and lysine, with lysine being particularly preferred. "Esters" are compounds in which a mono- or di-carboxylic fatty acid with 8 to 12 carbon atoms is bonded to a saturated aliphatic alcohol with 12 to 20 carbon atoms via an ester bond. The alkyl chains of the fatty acid and aliphatic alcohol can be straight-chain or branched; examples include isostearate sebacic acid. "Metal complexes of esters" refer to compounds formed by the coordination bonding of an ester to a metal atom; for example, isopropoxytitanium triisostearate is a preferred example.

[0033] The pigment of the present invention (A) can be prepared by adsorbing acylated amino acids or their salts onto the pigment surface using conventional methods.

[0034] As the pigment (A) used in this invention, it is preferred to use a pigment that has been surface-treated with a surface treatment agent (ASL treatment agent) containing sodium lauroyl glutamate and lysine, or with a surface treatment agent (ASI treatment agent) containing sodium lauroyl aspartate and isopropoxytitanium triisostearate.

[0035] As the pigment (A) of the present invention, commercially available products can also be used. Examples of preferred commercially available products include: ASL-1TiO2 CR-50, ASL-RED R516P, ASL-YELLOW LL-100P, ASL-BLACK BL-100P and other ASL-treated powders; ASI-treated powders such as ASI TiO2 CR-50, ASI-RED R516P, ASI-YELLOW LL-100P, ASI-BLACK BL-100P, ASI-TALCJA46R and other ASI-treated powders (all manufactured by Daito Kasei Corporation).

[0036] The cosmetic of the present application can be combined with one kind of the above-mentioned pigments treated with a surface treatment agent, or two or more kinds of them can be combined.

[0037]

[0038] <(B) Oil Fraction>

[0039] The (B) oil fraction (hereinafter sometimes referred to as "(B) component") combined in the cosmetic of the present application is not particularly limited as long as it is an oil fraction generally combined in cosmetics, and as examples, there can be mentioned hydrocarbon oils, ester oils, higher alcohols having a carbon number of 12 to 22, fatty acids having a carbon number of 12 to 22, oil fats, waxes, and the like. Even polar oils which have been considered to lower emulsion stability in the past can be stably combined in the cosmetic of the present application.

[0040] Among them, the amount of the silicon oil combined in the cosmetic of the present application is 10 mass% or less, preferably 5 mass% or less, and further preferably 1 mass% or less, relative to the total amount of the cosmetic. In addition, the cosmetic of the present application also includes a mode in which substantially no silicon oil is combined.

[0041] As the hydrocarbon oil, there can be mentioned, for example, liquid paraffin, isohexadecane, isododecane, ozocerite, squalane, squalene, pristane, paraffin, isoparaffin, white wax, vaseline, microcrystalline wax, hydrogenated polyisobutene, olefin oligomer, volatile hydrocarbon oil (e.g., isododecane, isohexadecane, undecane, tridecane, and the like), and the like.

[0042] ​As the ester oil, for example, isopropyl myristate, cetyl ethylhexanoate, octyldodecyl myristate, isopropyl palmitate, butyl stearate, hexyl laurate, myristyl myristate, decyl oleate, dimethyl octanoic acid hexyl decyl ester, cetyl lactate, myristyl lactate, isocetyl stearate, isocetyl isostearate, cholesteryl 12-hydroxystearate, ethylene glycol di-2-ethylhexanoate, dipentaerythritol fatty acid ester, N-alkyl glycol mono-isostearate, neopentyl glycol dicaprate, diisostearyl malate, glycerol di-2-heptylundecanoate, trimethylolpropane tri-2-ethylhexanoate, trimethylolpropane triisostearate, glycerol triisostearate, pentaerythritol tetraethylhexanoate, glycerol triisooctanoate (glyceryl tri(2-ethylhexanoate)), cetyl 2-ethylhexanoate, 2-ethylhexyl palmitate, trimyristin, glycerol tri-2-heptylundecanoate, castor oil fatty acid methyl ester, oleyl oleate, cetyl stearyl alcohol, acetyl glycerin, 2-heptylundecyl palmitate, diisobutyl adipate, N-lauroyl-L-glutamic acid-2-octyldodecyl ester, di-2-heptylundecyl adipate, ethyl laurate, di-2-ethylhexyl sebacate, 2-hexyldecyl myristate, 2-hexyldecyl palmitate, 2-hexyldecyl adipate, diisopropyl sebacate, 2-ethylhexyl succinate, polypropylene glycol dipivalate, ethyl acetate, butyl acetate, amyl acetate, triethyl citrate, and the like can be exemplified.

[0043] As the higher alcohol having a carbon number of 12 to 22, for example, oleyl alcohol, 2-decyltetradecyl alcohol, dodecanol, isostearyl alcohol, octyldodecanol, and the like can be exemplified. As the fatty acid having a carbon number of 12 to 22, for example, oleic acid, isostearic acid, linoleic acid, linolenic acid, and the like can be exemplified.

[0044] As the oil and fat, for example, Japan wax, cocoa butter, hydrogenated castor oil, avocado oil, camellia seed oil, macadamia nut oil, corn oil, olive oil, rapeseed oil, sesame oil, almond oil, wheat germ oil, camellia oleifera seed 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 tung oil, jojoba oil, germ oil, triglycerol, glycerol trioctanoate, glycerol triisopalmirate, and the like can be exemplified.

[0045] As the wax, for example, carnauba wax, beeswax, candelilla wax, jojoba wax, and the like can be exemplified.

[0046] In the cosmetic of the present application, when the proportion of the polar oil with respect to the total amount of the oil component is 40% or more in terms of mass ratio, the dispersion stability of the powder is improved. Therefore, in the cosmetic of the present application, it is preferable that the proportion of the polar oil in the total amount of the (B) oil component is set to 40% or more.

[0047] As the polar oil, there can be mentioned oils having an IOB value of 0.05 to 0.80, particularly ester oils. As specific examples of the polar oil, there can be mentioned isostearic acid, isopropyl myristate, cetyl octanoate, octyldodecyl myristate, isopropyl palmitate, butyl stearate, hexyl laurate, myristyl myristate, decyl oleate, dimethyl octanoic acid hexyl decyl ester, isononyl isononanoate, cetyl lactate, myristyl lactate, isocetyl stearate, isocetyl isostearate, cetyl ethylhexanoate, cholesteryl 12-hydroxystearate, ethylene glycol di-2-ethylhexanoate, dipentaerythritol fatty acid ester, N-alkyl glycol mono isostearate, neopentyl glycol dicaprate, diisostearyl malate, glycerol di-2- heptylundecanoate, trimethylolpropane tri-2-ethylhexanoate, trimethylolpropane triisostearate, pentaerythritol tetra-2-ethylhexanoate, glycerol tri-2-ethylhexanoate (glyceryl triisooctanoate), cetyl isooctanoate, cetyl 2-ethylhexanoate, 2-ethylhexyl palmitate, C12-15 alcohol benzoate, cetyl stearyl alcohol isononanoate, caprylic / capric acid triglyceride, butylene glycol dicaprylate / dicaprate, trimyristin, glycerol tri-2- heptylundecanoate, castor oil fatty acid methyl ester, oleyl oleate, cetyl stearyl alcohol, acetyl glycerin ester, 2-heptylundecyl palmitate, diisobutyl adipate, N-lauroyl-L-glutamic acid-2-octyldodecyl ester, di-2-heptylundecyl adipate, ethyl laurate, di-2-ethylhexyl sebacate, 2-hexyldecyl myristate, 2-hexyldecyl palmitate, 2-hexyldecyl adipate, diisopropyl sebacate, di-2-ethylhexyl succinate, ethyl acetate, butyl acetate, amyl acetate, triethyl citrate, 2-ethylhexyl p-methoxycinnamate, tripropylene glycol dipivalate, 2-ethylhexyl 2-cyano-3,3-diphenylacrylate, and the like.

[0048] (B) The amount of the oil component to be incorporated is not particularly limited as long as it is the amount generally used when a pigment or a powder such as an ultraviolet scattering agent is incorporated in an oil phase, and, for example, 5 to 50% by mass relative to the total amount of the cosmetic can be mentioned. If the amount of the oil component to be incorporated exceeds 50% by mass, there is a tendency that the stability and the use properties are deteriorated.

[0049] (C) Hydrophobic Ultraviolet Scattering Agent

[0050] The (C) hydrophobic ultraviolet scattering agent (hereinafter sometimes referred to as "(C) component") to be incorporated in the cosmetic of the present application can be appropriately selected from the hydrophobic ultraviolet scattering agents generally used in cosmetics, and is not particularly limited, and refers to one in which the surface of the particles is hydrophobic. As specific examples, there can be mentioned metal oxides such as titanium oxide, zinc oxide, iron oxide, cerium oxide, tungsten oxide, and the like. In the present application, titanium oxide and zinc oxide are preferred. Further, fine particles having an average particle diameter of 0.1 μm or less are preferred. The lower limit of the average particle diameter is not particularly limited, and is usually about 5 nm.

[0051] The ultraviolet scattering agent used in the present application can be any of those which are not surface-treated and those which are surface-treated to be hydrophobic, as long as the surface of the particles is hydrophobic. As the surface treatment agent for hydrophobization, there are no particular limitations, and examples include silicone treatment agents, fluorine compound treatment agents, amino acid treatment agents, fatty acid treatment agents, fatty acid soap treatment agents, fatty acid ester treatment agents, lecithin treatment agents, and alkyl phosphate esters.

[0052] As the silicone treatment agent, examples include silicone oils such as methylhydrogenpolysiloxane, dimethylpolysiloxane, and methylphenylpolysiloxane; alkylsilanes such as methyltrimethoxysilane, ethyltrimethoxysilane, hexyltrimethoxysilane, and octyltrimethoxysilane; and fluorine alkylsilanes such as trifluoromethylethyltrimethoxysilane and heptadecafluorodecyltrimethoxysilane. As the fluorine compound treatment agent, examples include perfluoroalkyl phosphate esters and perfluoroalcohols. As the amino acid treatment agent, examples include N-acyl glutamic acid, N-acyl aspartic acid, and N-acyl lysine. As the fatty acid treatment agent, examples include palmitic acid, isostearic acid, stearic acid, lauric acid, myristic acid, behenic acid, oleic acid, abietic acid, and 12-hydroxystearic acid. As the fatty acid soap treatment agent, examples include aluminum stearate, calcium stearate, and aluminum 12-hydroxystearate. As the fatty acid ester treatment agent, examples include dextrin fatty acid ester, cholesterolfatty acid ester, sucrose fatty acid ester, and starch fatty acid ester. These hydrophobization treatments can be performed according to conventional methods.

[0053] The cosmetic according to the present application can highly incorporate the ultraviolet scattering agent in the oil phase, and thus can achieve sufficient ultraviolet protection effects even without incorporating an ultraviolet absorber. Therefore, the amount of the ultraviolet absorber incorporated in the cosmetic according to the present application is 3% by mass or less, preferably 1% by mass or less, relative to the total amount of the cosmetic. In addition, the cosmetic according to the present application also includes a type which does not substantially incorporate an ultraviolet absorber. By adopting the type which does not substantially incorporate an ultraviolet absorber, a "non-chemical" cosmetic can be produced.

[0054] The "non-chemical" cosmetic refers to a cosmetic which does not contain an organic ultraviolet absorber but contains an inorganic ultraviolet scattering agent, and thus exerts a skin protection effect against ultraviolet rays.

[0055] (C) The amount of the ultraviolet scattering agent incorporated is not particularly limited as long as it is an amount sufficient to achieve the desired ultraviolet protection effect, and is usually 1% by mass or more, for example, 5 to 30% by mass, preferably 10 to 30% by mass, relative to the total amount of the cosmetic. When the amount is less than 5% by mass, it is difficult to achieve sufficient ultraviolet protection effects, and when it exceeds 30% by mass, there is a tendency that the stability deteriorates. In the case where the cosmetic according to the present application is produced as a non-chemical cosmetic, it is preferable to set the total content of the ultraviolet scattering agents to 10% by mass or more.

[0056] (D) water-soluble alkyl-substituted polysaccharide derivative

[0057] As the (D) water-soluble alkyl-substituted polysaccharide derivative (hereinafter also referred to as "(D) component") used in the cosmetic of the present application, there are no particular limitations, and hydrophobically modified alkyl cellulose, hydrophobically modified sulfated polysaccharide derivative, and the like can be exemplified.

[0058] As the hydrophobically modified alkyl cellulose, an alkyl cellulose which has been hydrophobically modified with an alkyl group having a carbon number of 14 to 22 is preferable. More specifically, it is a compound in which a long-chain alkyl group as a hydrophobic group has been introduced into a water-soluble cellulose ether derivative, and a substance represented by the following general formula (I) is preferable.

[0059]

[0060] [In the formula, R, which can be the same or different, is one or more selected from the group consisting of a hydrogen atom, an alkyl group having a carbon number of 1 to 4, a group -[CH2CH(CH3)O] m -H (in the formula, m is an integer of 1 to 5, preferably 1 to 3), a group -CH2CH2OH, and a group -CH2CH(OH)CH2OR' (in the formula, R' is an alkyl group having a carbon number of 14 to 22), and it is necessary to contain the group -CH2CH(OH)CH2OR'. In addition, A is a group -(CH2) q -(q is an integer of 1 to 3, preferably 1), and n is an integer of 100 to 10,000, preferably 500 to 5,000.]

[0061] As for the production method of the hydrophobically modified alkyl cellulose of the above formula (I), a long-chain alkyl glycidyl ether of a compound having a carbon number of 14 to 22, specifically the following formula (II), is contacted with a water-soluble cellulose ether derivative which becomes a group, specifically methyl cellulose (R is a hydrogen atom or a methyl group), ethyl cellulose (R is a hydrogen atom or an ethyl group), propyl cellulose (R is a hydrogen atom or a propyl group), butyl cellulose (R is a hydrogen atom or a butyl group), hydroxypropyl cellulose [R is a hydrogen atom or a hydroxypropyl group (group -[CH2CH(CH3)O] m -H (in the formula, m is an integer of 1 to 5, preferably 1 to 3)], hydroxypropyl methyl cellulose (R is a hydrogen atom, a methyl group, or a hydroxypropyl group (same as above)), and the like in the presence of an alkali catalyst to obtain.

[0062]

[0063] [R' is an alkyl group having a carbon number of 14 to 22.]

[0064] The content of the group -CH2CH(OH)CH2OR' introduced in the hydrophobically modified alkyl cellulose of the present application is preferably about 0.1 to 5.0 mass% relative to the entire hydrophobically modified alkyl cellulose. In order to set such a content, the molar ratio at the time of reacting the above water-soluble cellulose ester derivative with the long-chain alkyl glycidyl ether, the reaction time, the type of base catalyst, and the like can be appropriately selected and manufacturing can be performed. After the above reaction, a purification process such as neutralization, filtration, washing, drying, and sieving of the reactants can be performed.

[0065] Note that, among the above water-soluble cellulose ether derivatives, a hydroxypropyl methyl cellulose is particularly preferably selected (thereby, R in formula (I) becomes a hydrogen atom, a methyl group, a group -[CH2CH(CH3)O] m H and a group -CH2CH(OH)CH2OR', q of the group A is 1, and the A becomes a methylene group).

[0066] In addition, R' in the long-chain alkyl glycidyl ether of formula (II) is an alkyl group having a carbon number of 14 to 22, is preferably an alkyl group having a carbon number of 14 to 20, and is further preferably a stearyl group (-C 18 H 37 ) having a carbon number of 18. When the carbon number of the alkyl group R' is less than 14 or is 23 or more, there is a case where the resulting hydrophobically modified alkyl cellulose has insufficient emulsion stability.

[0067] The weight average molecular weight of the hydrophobically modified alkyl cellulose is preferably 100000 to 1000000, more preferably 300000 to 800000, and further preferably 550000 to 750000.

[0068] As the hydrophobically modified sulfated polysaccharide derivative, a compound having a polysaccharide or a derivative thereof as a basic skeleton, and a part or all of the hydrogen atoms of the hydroxyl groups being substituted with a substituent (a) and a substituent (b) is preferable. The substituent (a) is preferably a glyceryl ether group having a hydrophobic portion selected from an alkyl glyceryl ether group having a linear or branched alkyl group having a carbon number of 10 to 40 and an alkenyl glyceryl ether group having a linear or branched alkenyl group having a carbon number of 10 to 40. The substituent (b) is preferably a sulfonoalkyl group having a carbon number of 1 to 5, or a salt thereof, the hydroxyl group being optionally substituted. Here, water-soluble means a property of dissolving 0.001 mass% or more in water at 25°C.

[0069] As specific examples of the substituent (a), there are no particular limitations, and 2-hydroxy-3-alkyloxypropyl, 2-alkyloxy-l-(hydroxymethyl)ethyl, 2-hydroxy-3-alkenyloxypropyl, 2-alkenyloxy-l-(hydroxymethyl)ethyl can be mentioned. As the alkyl group or alkenyl group having 10 to 40 carbon atoms which is substituted in these glyceryl ether groups, straight-chain or branched alkyl groups and alkenyl groups having 12 to 36 carbon atoms, further preferably 16 to 24 carbon atoms are preferred, of which alkyl groups are preferred, and straight-chain alkyl groups are more preferred.

[0070] Further, as specific examples of the substituent (b), there are no particular limitations, and 2-sulfoethyl, 3-sulfopropyl, 3-sulfo-2-hydroxypropyl, 2-sulfo-l-(hydroxymethyl)ethyl, and the like can be mentioned, and all or a part thereof can be a salt with alkali metal such as Na, K, alkaline earth metal such as Ca, Mg, organic cation group such as amine, and the like, ammonium ion, and the like.

[0071] The degree of substitution of the substituent (a) with respect to the structural monosaccharide residue is preferably 0.001 to 1, more preferably 0.002 to 0.5, and further preferably 0.003 to 0.1. The degree of substitution of the substituent (b) with respect to the structural monosaccharide residue is preferably 0.01 to 2.5, more preferably 0.02 to 2, and further preferably 0.1 to 1.5. Further, the ratio of the number of the substituent (a) to the substituent (b) is preferably 1:1000 to 100:1, more preferably 1:500 to 10:1, and further preferably 1:300 to 10:1.

[0072] As the polysaccharide or derivative thereof which is the basic skeleton of the hydrophobically-modified sulfated polysaccharide derivative, there are no particular limitations, and cellulose, hydroxyethyl cellulose, methyl cellulose, ethyl cellulose, hydroxypropyl cellulose can be mentioned. The weight average molecular weight of these polysaccharides or derivatives thereof is preferably 10000 to 10000000, more preferably 100000 to 5000000, and further preferably 300000 to 2000000.

[0073] As the (D) component used in the cosmetic of the present application, there are no particular limitations, and hydrophobically-modified alkyl celluloses such as hydroxypropyl methyl cellulose stearylox ether, laureth-13 PG hydroxyethyl cellulose, and the like; hydrophobically-modified sulfated polysaccharide derivatives such as stearylox PG hydroxyethyl cellulose sulfonate, and the like can be mentioned. Of these, hydroxypropyl methyl cellulose stearylox ether or stearylox PG hydroxyethyl cellulose sulfonate is more preferred.

[0074] In the present application, as the component (D), commercially available products can also be used. For example, as hydroxypropyl methylcellulose stearoxyl ether, SANGELOSE 60L (manufactured by Daito Kogyo K.K.), SANGELOSE 90L (manufactured by Daito Kogyo K.K.), and the like can be exemplified, and as stearoxyl PG hydroxyethyl cellulose sulfonate, POIZ 310 (manufactured by Kawabata Kagaku K.K.), and the like can be exemplified.

[0075] The blending amount of the component (D) in the cosmetic of the present application is 0.01 to 1% by mass, preferably 0.05 to 0.5% by mass, and more preferably 0.1 to 0.3% by mass, relative to the total amount of the cosmetic. If it is less than 0.05% by mass, sufficient emulsion stability cannot be obtained, and even if it is blended in excess of 1% by mass, the effect cannot be further increased.

[0076] In the cosmetic of the present application, the stability and the usability can be improved by further blending a water-soluble thickening agent other than the water-soluble alkyl-substituted polysaccharide derivative as the component (D). As the water-soluble thickening agent used in the present application, a substance used as an emulsifier having thickening properties, which is usually blended in the water phase of an emulsion-type cosmetic and the like, can be appropriately selected.

[0077] As the water-soluble thickening agent, for example, gum arabic, gum tragacanth, galactan, locust bean gum, guar gum, karaya gum, carrageenan, xanthan gum, pectin, agar, buckthorn seed (quince), sodium alginate (brown algae extract), and the like plant-based polymers; gellan gum, dextran, succinoglucan, pullulan, and the like microorganism-based polymers; collagen, casein, albumin, gelatin, and the like animal-based polymers; starch (rice, corn, potato, millet), carboxymethyl starch, hydroxypropyl methyl starch, and the like starch-based polymers; methyl cellulose, nitrocellulose, ethyl cellulose, hydroxypropyl methyl cellulose, hydroxyethyl cellulose, sodium cellulose sulfate, hydroxypropyl cellulose, sodium carboxymethyl cellulose, crystalline cellulose, cellulose powder, and the like cellulose-based polymers; sodium alginate, propylene glycol alginate, and the like alginic acid-based polymers; polyvinyl methyl ether, carboxyvinyl polymer, and the like vinyl-based polymers; polyoxyethylene-based polymers; polyoxyethylene polyoxypropylene copolymer-based polymers; polyethyl acrylate, polyacrylamide, and the like acrylic acid-based polymers; polyethylene imine, cationic polymers, bentonite, magnesium aluminum silicate, lithium clay, montmorillonite, anhydrous silicic acid, and the like inorganic water-soluble polymers; PEG-240 / HDI copolymer bis-decyltetradecin polyether-20 ether, dimethyl acrylamide / sodium acryloyldimethyl taurate crosslinked polymer, sodium acrylate / sodium acryloyldimethyl taurate copolymer, alkyl acrylate / stearyl polyether-20 methacrylate copolymer, (ammonium acryloyldimethyl taurate / vinyl pyrrolidone) copolymer, and the like can be exemplified.

[0078] The cosmetic of the present application, when using a thickening agent in an aqueous phase which has low salt tolerance in which the viscosity decreases due to an increase in the concentration of electrolytes, particularly at a concentration within the range of a usual blending amount in cosmetics (hereinafter also referred to as "thickening agent in which the viscosity decreases due to an increase in the concentration of electrolytes"), when the cosmetic is applied to the skin, a unique moist feeling of use is obtained.

[0079] The "unique moist feeling of use" in the present application means that when the cosmetic is applied to the skin with a finger or the like, the viscosity sharply decreases, and a feeling of disintegration is obtained, and at the same time, a very moist feeling is obtained with respect to the skin.

[0080] As the thickening agent in which the viscosity decreases due to an increase in the concentration of electrolytes, there are no particular limitations, and examples include vinyl-based polymers such as polyvinyl alcohol, polyvinyl acetate, polyvinyl methyl ether, polyvinyl pyrrolidone, a copolymer of vinyl pyrrolidone and vinyl acetate, and a carboxy vinyl polymer; acrylic-based polymers such as sodium polyacrylate, polyacrylate ethyl, polyacrylic acid alkanolamine, a copolymer of alkyl methacrylate and dimethylaminoethyl methacrylate, poly 2-acrylamide-2-methylpropane sulfonic acid, polymethylacryloyl oxytrimethyl ammonium, (acryloyl dimethyl ammonium taurate / vinyl pyrrolidone) copolymer, and dimethyl acrylamide / acryloyl dimethyl sodium taurate cross-linked polymer.

[0081] As the water-soluble thickening agent of the present application, one or two or more selected from the above-described substances can be blended and used.

[0082] The blending amount of the water-soluble thickening agent in the cosmetic of the present application is preferably 0.05 to 3% by mass, more preferably 0.1 to 2% by mass, and further preferably 0.15 to 1% by mass, with respect to the total amount of the cosmetic.

[0083] The cosmetic according to the present application can achieve a "silicone-free" cosmetic which does not contain a silicone compound.

[0084] The "silicone compound" in the present specification means a compound having a siloxane (-Si-O-Si-) structure in the molecule (for example, organosilicon and siloxane) and silane (monosilane, oligosilane, polysilane, and silane derivatives, for example, alkylsilane, alkoxy silane, and the like), including silicone oil, silicone elastomer, silicone-based surfactant, and powder which has been surface-treated with a silicone compound. Note that the "silicone compound" in the present application does not include silicon dioxide (silica).

[0085] The cosmetic of the present application, by combining a pigment which has been treated with the above-described specific surface treatment agent with a water-soluble alkyl-substituted polysaccharide derivative, the dispersibility and stability of the powder, particularly the stability to vibration, are significantly improved even as a silicone-free cosmetic.

[0086] In the cosmetic of the present application, other arbitrary components ordinarily used in skin external agents such as cosmetics, pharmaceuticals, and the like can be appropriately blended as needed within a range not impairing the object and effects of the present application, in addition to the above-mentioned components. As the other arbitrary components, for example, powders other than the above-mentioned (A) and (C) components, surfactants, high molecular compounds, chelating agents, lower alcohols, polyhydric alcohols, pH adjusting agents, antioxidants, perfumes, preservatives, bactericides, various pharmaceutical agents, and the like can be exemplified. However, these exemplifications are not limiting.

[0087] The cosmetic of the present application can be manufactured according to a general method, and can be produced in a dosage form such as a liquid, emulsion, paste, cream, gel, solid, and the like.

[0088] The cosmetic of the present application can be provided in the form of a makeup cosmetic such as foundation, base, concealer, blush, eye shadow, mascara, eyeliner, eyebrow pencil, covering agent (Japanese: overcoat agent), lipstick, and the like; a skin care product such as sunscreen, and the like, and is suitable for a makeup cosmetic, particularly foundation, base.

[0089] Examples

[0090] The present application is further explained in detail by the following examples, but the present application is not limited by these examples in any way. The blending amount is expressed in mass% with respect to the system to which the component is blended, unless otherwise specified. Before specifically explaining each example, the evaluation method employed is explained.

[0091] 1. Evaluation of powder dispersibility immediately after preparation

[0092] The appearance of the sample was visually observed immediately after preparation, and the dispersibility of the powder was evaluated based on the following criteria. The fewer the color streaks, the more uniform the powder dispersion.

[0093] A: No color streaks were observed at all.

[0094] B: Color streaks were observed slightly, but to a degree that was not problematic for use.

[0095] C: Color streaks were observed clearly.

[0096] D: Color streaks were visible, and the sample could not be used as a cosmetic.

[0097] 2. Evaluation of vibration stability

[0098] The prepared sample 30 ml was charged into a resin tube, and vibration was applied at 30 minutes, 10 Hz or more. The emulsion separation and the aggregation state of the powder of the sample after standing were visually observed, and evaluated based on the following criteria.

[0099] A: No emulsion breakdown or powder aggregation was observed.

[0100] B: Slight emulsion breakdown, powder aggregation.

[0101] C: Visible emulsion breakdown, powder aggregation.

[0102] D: Obvious emulsion breakdown, powder aggregation.

[0103] 3. Evaluation of stability over time

[0104] The test sample was filled into a threaded tube (50 ml) and left standing in a thermostat at 50°C for 2 weeks. Before and after standing, the change in viscosity was measured with a rotational viscometer (Bismetron rotational viscometer), and observation of the emulsion particles and appearance was performed, and evaluation was performed based on the following criteria.

[0105] A: No change in viscosity, no problem with emulsion particles / appearance.

[0106] B: Slight change in viscosity, change in emulsion particles / appearance, but to a degree that is not a problem for use.

[0107] C: Change in viscosity, change in emulsion particles / appearance.

[0108] D: Change in viscosity, change in emulsion particles / appearance, cannot be used as a cosmetic.

[0109] An oil-in-water emulsion cosmetic having the composition shown in the table below was prepared by a conventional method. For the prepared test sample, stability and powder dispersibility were evaluated according to the above evaluation method. The results are shown in the table.

[0110] [Table 1]

[0111]

[0112] *1: ASL-1 Ti02 CR-50 (manufactured by Daito Kasei Kogyo Co., Ltd.)

[0113] *2: ASL-YELLOW LL-100P (manufactured by Daito Kasei Kogyo Co., Ltd.)

[0114] *3: ASL-RED R516P (manufactured by Daito Kasei Kogyo Co., Ltd.)

[0115] *4: ASI Ti02 CR-50 (manufactured by Daito Kasei Kogyo Co., Ltd.)

[0116] *5: ASI-YELLOW LL-100P (manufactured by Daito Kasei Kogyo Co., Ltd.)

[0117] *6: ASI-RED R516P (manufactured by Daito Kasei Kogyo Co., Ltd.)

[0118] *7: NHS-TITAN CR-50 (manufactured by Miki Chemical Industry Co., Ltd.)

[0119] *8: NHS-YELLOW LL-100P (manufactured by Miki Chemical Industry Co., Ltd.)

[0120] *9: NHS-RED R516PS (manufactured by Miki Chemical Industry Co., Ltd.)

[0121] *10: NAI-TITAN CR-50 (manufactured by Miki Chemical Industry Co., Ltd.)

[0122] *11: NAI-YELLOW LL-100P (manufactured by Miki Chemical Industry Co., Ltd.)

[0123] *12: NAI-RED R516PS (manufactured by Miki Chemical Industry Co., Ltd.)

[0124] *13: LL TiO2 CR-50 (manufactured by Daiei Chemical Industry Co., Ltd.)

[0125] *14: LL-YELLOW LL-100P (manufactured by Daiei Chemical Industry Co., Ltd.)

[0126] *15: LL-RED R516P (manufactured by Daiei Chemical Industry Co., Ltd.)

[0127] *16: MI-TITAN CR-50 (manufactured by Miki Chemical Industry Co., Ltd.)

[0128] *17: MI-YELLOW LL-100P (manufactured by Miki Chemical Industry Co., Ltd.)

[0129] *18: MI-RED R516PS (manufactured by Miki Chemical Industry Co., Ltd.)

[0130] *19: ST-485SA (manufactured by Titan Kogyo, Ltd.)

[0131] As shown in the table, the cosmetic of Comparative Example 1, which was not compounded with the (D) water-soluble alkyl-substituted polysaccharide derivative of the present application, failed to emulsify. In addition, the cosmetics of Comparative Examples 2 to 6, which were subjected to hydrophobization treatment of the pigment using a treatment agent (NHS treatment, NAI treatment) containing disodium stearoyl glutamate having a condensate of stearic acid having a carbon number of 18 and glutamic acid, a treatment agent (LL treatment) of an acylated amino acid in which the amino acid was lysine, a fatty acid soap treatment agent (MI treatment), and a silicone treatment agent (EP1 treatment), were observed to have color streaks immediately after preparation, and emulsion breakdown, aggregation of powder, and poor stability over time were clearly observed after the vibration test.

[0132] On the other hand, the cosmetic of Example 1 and Example 2 in which the components (A) to (D) of the present application were combined showed good powder dispersibility immediately after preparation, and the vibration stability and the stability over time were also excellent.

[0133] Note that the cosmetic of Comparative Example 5 containing the pigment subjected to the hydrophobizing treatment using a fatty acid soap treatment agent (MI treatment) corresponds to the cosmetic of the invention of Patent Document 1, and it was shown that the cosmetic of the present application is a cosmetic in which the powder dispersibility and the stability over time are improved, as compared with the cosmetic of the invention of Patent Document 1.

Claims

1. An oil-in-water emulsified cosmetic comprising: (A) a pigment surface-treated with a surface-treatment agent comprising an acylated glutamic acid or aspartic acid or a salt thereof with a saturated aliphatic acid having a carbon number of 8 to 14, (B) an oil component, (C) a hydrophobic ultraviolet scattering agent, and (D) a water-soluble alkyl-substituted polysaccharide derivative, wherein the combined amount of the ultraviolet absorber is less than 1 mass% relative to the total amount of the cosmetic, the silicone oil is 10 mass% or less relative to the total amount of the cosmetic, the (A) and (C) components are dispersed in the oil phase, the saturated aliphatic acid having a carbon number of 8 to 14 is selected from the group consisting of caprylic acid, lauric acid, and myristic acid, the water-soluble alkyl-substituted polysaccharide derivative is selected from the group consisting of hydroxypropyl methylcellulose stearyloxy ether and stearyloxy PG hydroxyethyl cellulose sulfonate, the combined amount of the pigments is 1 to 20 mass% relative to the total amount of the cosmetic, the combined amount of the oil component is 5 to 50 mass% relative to the total amount of the cosmetic, the combined amount of the hydrophobic ultraviolet scattering agent is 5 to 30 mass% relative to the total amount of the cosmetic, the combined amount of the water-soluble alkyl-substituted polysaccharide derivative is 0.01 to 1 mass% relative to the total amount of the cosmetic.

2. The oil-in-water emulsified cosmetic according to claim 1, wherein The acylated amino acid is sodium lauroyl glutamate or sodium lauroyl aspartate.

3. The oil-in-water emulsified cosmetic according to claim 1 or 2, further comprising (E) a water-soluble thickening agent.

4. The oil-in-water emulsified cosmetic according to claim 1, wherein The polar oil accounts for 40% or more by mass in the (B) oil component.

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