JP2007284389A - Skin cosmetic - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a skin cosmetic compounded with a thickening agent, characterized in tending to disintegrate leading to refreshing feel in use, and extremely highly stable as well. <P>SOLUTION: The skin cosmetic comprises (a) 0.1-1.0 mass% of an acrylamide-based thickening agent, (b) 0.01-1.0 mass% of a carboxyvinyl polymer, (c) 0.01-3.0 mass% of sodium carbonate and (d) water. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a skin cosmetic containing a thickener. More specifically, the present invention relates to a skin cosmetic that is characterized by a fragile and fresh feeling of use and that has extremely excellent stability.

  Water-soluble thickeners that can be used in skin cosmetics include various polysaccharides, natural polymers such as gelatin, synthetic polymers such as polyoxyethylene and crosslinked poly (meth) acrylic acid, and inorganic minerals such as montmorillonite and silica. Etc.

  Among these, cross-linked poly (meth) acrylic acid is particularly inexpensive and has a high thickening effect and gels in a small amount. Therefore, it is frequently used as a water-soluble thickener or stabilizer in the cosmetic industry, especially skin cosmetics. Has been.

  However, cross-linked poly (meth) acrylic acid is inhibited from dissociation of carboxyl groups under acidic conditions of pH 5 or lower or in an aqueous solution containing salts, and the viscosity is extremely lowered and does not gel. For this reason, it cannot be used in a formulation that requires acidic conditions and a salt coexistence system.

  The most commonly used thickener for cosmetics is a polymer of acrylic acid, which is collectively called carboxyvinyl polymer, and the trade names are Hibiswako (Wako Pure Chemicals), Sinteren (3V SIGMA), It is commercially available as Carbopol (Goodrich). These thickeners are chemically cross-linked polymers.

Such an aqueous dispersion of a crosslinked polymer has a very high thickening effect and is widely used as a thickener for cosmetics.
However, as a drawback of these carboxyvinyl polymers, when used alone, they are excellent in stability but poor in skin familiarity, stickiness, and inferior penetration feeling. In addition, there is a problem that the pH range in which viscosity can be increased is limited. In the carboxyvinyl polymer, the polymer swells and thickens in water when the carboxyl group contained in the polymer is in a dissociated state. Therefore, there is a serious drawback that the carboxyvinyl polymer does not function as a thickener in a pH range of weak acid or less where the carboxyl group is not sufficiently dissociated. There is currently a strong demand for thickeners that have an excellent skin familiarity and excellent usability and can be thickened over a wide pH range.

  On the other hand, acrylamide-based thickeners have been tried to be incorporated into cosmetics because they are excellent in use feeling and can cope with a low pH range. However, when these acrylamide-based thickeners are used alone, there is a problem from the viewpoint of stability that the viscosity decreases with time.

  On the other hand, a thickener composed of a water-swellable polymer microgel has been developed by the present applicant as an acrylamide-based thickener having good stability and is used in cosmetics (Patent Document 1). In addition, a thickener made of hydrophobic polyether urethane has been developed as an associative polymer (Patent Document 2), and is used in cosmetics (Patent Document 3), hair cosmetics and cleaning materials (Patent Document 4). . However, these thickeners are not necessarily easily broken and do not give a fresh feeling of use.

Thus, in the field of cosmetics, many various thickeners are energetically studied from the viewpoint of cosmetic stability and usability.
JP 2004-43785 A JP-A-9-71766 JP 2000-239120 A WO 02/00179

  In view of the above-mentioned viewpoints, the present inventors have conducted extensive research on skin cosmetics containing various thickeners, and as a result, combined use of an acrylamide thickener and a carboxyvinyl polymer as a thickener, Addition of sodium carbonate breaks up the thickened cosmetic with a slight force, makes it fresh and easy to spread on the skin, gives the skin a good fit and is moist and non-sticky, and has excellent stability. It has been found that skin cosmetics can be provided. Furthermore, when xanthan gum is blended with this skin cosmetic, it has been found that water can be provided without separation even when filled in a dispenser container, and the present invention has been completed.

  An object of the present invention is to provide a skin cosmetic that is characterized by a fragile and fresh feeling of use and that is extremely excellent in stability.

  That is, the present invention comprises (a) 0.1 to 1.0% by mass of an acrylamide thickener, (b) 0.01 to 1.0% by mass of carboxyvinyl polymer, and (c) 0.01% sodium carbonate. The present invention provides a skin cosmetic comprising -3.0% by mass and (d) water.

  In the present invention, the (a) acrylamide-based thickener is a vinylpyrrolidone / 2-acrylamido-2-methylpropanesulfonic acid copolymer or a dimethylacrylamide / 2-acrylamido-2-methylpropanesulfonic acid copolymer. , Acrylic acid amide / 2-acrylamido-2-methylpropanesulfonic acid copolymer, a mixture of polyacrylic acid amide and sodium polyacrylate, sodium acrylate / 2-acrylamido-2-methylpropanesulfonic acid copolymer, poly The above skin makeup characterized by being one or more thickeners selected from the group consisting of ammonium acrylate, polyacrylamide / ammonium acrylate copolymer, acrylamide / sodium acrylate copolymer A fee is provided.

  Furthermore, this invention provides said skin cosmetics characterized by further containing (e) xanthan gum.

  Moreover, this invention provides said skin cosmetics characterized by further containing (f) sodium lactate.

  Furthermore, this invention provides said skin cosmetics characterized by the viscosity of the said skin cosmetics being 4000-30000 mPa * s in 30 degreeC.

  The present invention also provides the above skin cosmetic, wherein the skin cosmetic is an oil-in-water emulsified cosmetic.

  Furthermore, the present invention provides the above-described skin cosmetic, wherein the skin cosmetic container is a dispenser.

INDUSTRIAL APPLICABILITY The present invention can provide a skin cosmetic that can be broken with a little force, is fresh, has a good skin fit, and has a moist and non-sticky feeling.
Moreover, in general, it is possible to provide a skin cosmetic that can sufficiently cope with a dispenser container, in which it is difficult to ensure stability due to generation of a lump by separation or drying.

  Hereinafter, the present invention will be described in detail.

  The acrylamide type thickener of the (a) component used for this invention is not specifically limited. For example, vinylpyrrolidone / 2-acrylamido-2-methylpropanesulfonic acid copolymer, dimethylacrylamide / 2-acrylamido-2-methylpropanesulfonic acid copolymer, acrylic acid amide / 2-acrylamido-2-methylpropanesulfonic acid Copolymer, polyacrylic acid amide and sodium polyacrylate mixture, sodium acrylate / 2-acrylamide-2-methylpropane sulfonic acid copolymer, ammonium polyacrylate, polyacrylamide / ammonium acrylate copolymer, acrylamide / Sodium acrylate copolymer and the like, but are not limited to these examples. One or more acrylamide type thickeners can be used.

  A particularly preferred acrylamide-based thickener in the present invention is a thickener comprising a microgel described in Patent Document 1. The thickener composed of the microgel is a composition in which an acrylamide monomer is produced by a polymerization method generally referred to as a reverse phase emulsion polymerization method in a composition having an organic solvent or oil as a dispersion medium and water as a dispersion phase. It is a molecular microgel. The microgel is preferably produced under the condition that the polymerization system in the inverse emulsion polymerization forms a single-phase microemulsion or a fine W / O emulsion. Specifically, it is preferable to use dimethylacrylamide and 2-acrylamido-2-methylpropanesulfonic acid and use a microgel copolymerized from these monomers as a thickener for component (a). Furthermore, it is also preferable to copolymerize a crosslinking monomer such as methylenebisacrylamide, and a copolymer microgel composed of dimethylacrylamide, 2-acrylamido-2-methylpropanesulfonic acid and methylenebisacrylamide is particularly preferable.

  (A) The compounding quantity of the acrylamide type thickener of a component is 0.1-1.0 mass% with respect to skin cosmetics whole quantity. If it is less than 0.1% by mass, the stability of the system is poor. On the other hand, when it exceeds 1.0 mass%, stickiness may be produced, and it is not preferable from the viewpoint of easy use and a fresh feeling of use.

  As the component (b) carboxyvinyl polymer, a general-purpose commercially available product can be used. The compounding quantity is 0.01-1.0 mass% with respect to skin cosmetics whole quantity from a stability viewpoint. If it is less than 0.01% by mass, the stability of the system becomes poor. From the viewpoint of a feeling of use that is easy to collapse and is not sticky, it is more preferably 0.03 to 0.2% by mass.

  (C) The component sodium carbonate functions as a stabilizer, a viscosity adjuster, a pH adjuster in the skin cosmetic of the present invention as well as the electrolyte type thickener of the component (a), and It is an essential ingredient that demonstrates the unpredictable effect of not reducing viscosity.

  In skin cosmetics, a salt is generally used as a stabilizer, a viscosity modifier, or a pH adjuster. Specific examples include sodium citrate, sodium lactate, and sodium chloride. However, these salts have a remarkable viscosity-reducing effect on the type of thickener that thickens by its own dissociation, and it is desirable as a low-viscosity region (4000-30000 mPa · s / 30 ° C.) as a skin cosmetic. There is a disadvantage that it is unsuitable for adjustment. Moreover, even if it was able to be adjusted, there was a problem that the viscosity decreased with time.

  Conventionally, as a thickener for cosmetics, a thickener that thickens by its own dissociation is, for example, a homopolymer of carboxyvinyl polymer, 2-acrylamido-2-methylpropanesulfonic acid (hereinafter sometimes abbreviated as AMPS). Vinyl pyrrolidone / AMPS copolymer, acrylic acid amide / AMPS copolymer, sodium acrylate / AMPS copolymer, sodium acrylate-acrylic acid amide mixture, etc., and these electrolyte type thickeners are , All of which are reduced in viscosity by the salt described above.

  The inventors of the present invention indicate that sodium carbonate functions as a stabilizer, a viscosity modifier, and a pH adjuster in a skin cosmetic containing an electrolyte type thickener as component (a), but does not reduce the viscosity. Newly found. If the thickeners of the components (a) and (b) and the sodium carbonate of the component (c) are combined, a medium to low viscosity that is easy to collapse and has a fresh feeling of use and has been difficult to adjust conventionally. It has been found that the region (4000-30000 mPa · s / 30 ° C.) can be freely adjusted.

  Sodium carbonate used in the present invention may be any of an anhydrous salt, a monohydrate, a decahydrate, or a mixture thereof. The compounding quantity is 0.01-3.0 mass% with respect to the skin cosmetics whole quantity. If the amount is less than 0.01% by mass, freshness may be lacking in terms of usability, and if it exceeds 3.0% by mass, the viscosity may decrease over time.

The skin cosmetic of the present invention is a skin cosmetic that is thickened by blending water as component (d).
The blending amount of water is not limited, but the effect of the present invention is more effectively exhibited when the water or the water phase mainly composed of water is 50.0 to 90.0% by mass with respect to the total amount of the skin cosmetic. Is done.
If the aqueous phase is less than 50.0% by mass, the weight may be felt and stickiness may occur. On the other hand, if it exceeds 90.0% by mass, it is refreshing, but it is not moist and it is difficult to obtain an excellent feeling of use.

  In the present invention, in particular, when a dispenser container is used as a filling container, in addition to the above components (a) to (d), by further blending (e) xanthan gum, the dispenser can be filled without impairing the freshness or breakage. It is possible to provide a skin cosmetic excellent in stability required for the preparation. If the dispenser container is not blended with (e) xanthan gum due to the pressure at the time of discharge, etc., the stability of the skin cosmetic of the present invention may be destroyed upon discharge and water may be separated. The component (e) is a requirement to brilliantly solve a specific phenomenon when filling the dispenser container with the skin cosmetic of the present invention, which is easily broken and has a fresh feeling of use. As a result, it becomes possible to provide the skin cosmetic of the present invention by filling it in an easy-to-use dispenser, and when taking out an appropriate amount and spreading it on the skin with a finger, it is easy to collapse and exhibits a fresh feeling of use. It becomes possible.

  (E) As for the compounding quantity of the xanthan gum of a component, 0.01-0.2 mass% is preferable with respect to skin cosmetics whole quantity, More preferably, it is 0.03-0.1 mass%. If it is less than 0.01% by mass, the stability at the time of taking out from the dispenser is poor. On the other hand, if it exceeds 0.2% by mass, it may be discharged as a lump, which is not preferable.

  In the present invention, it is preferable to add (f) sodium lactate in addition to the essential components (a) to (c) because the fresh feeling of use is further increased.

  (F) 0.01-3.0 mass% is preferable with respect to the skin cosmetics whole quantity, and, as for the compounding quantity of the sodium lactate of component, More preferably, it is 0.01-1 mass%. If it is less than 0.01% by mass, the effect cannot be expected, and if it exceeds 3.0% by mass, the stability of the system may be poor.

  In the skin cosmetic of the present invention, it is preferable to adjust the viscosity to 4000 to 30000 mPa · s / 30 ° C. (measured by a B-type viscometer) as an optimum viscosity that can provide a fresh feeling of use.

  The dosage form of the skin cosmetic of the present invention is arbitrary, and for example, a solubilization system, a water dispersion system, an emulsification system and the like can be produced. The essential ingredients, an oil component and an emulsifier are mixed and emulsified by a conventional method. An oil-type skin cosmetic is preferred. In the oil-in-water skin cosmetic, the water phase component is particularly preferably 50.0 to 90.0% by mass, and the oil phase component is preferably 10.0 to 50.0% by mass, so that the feeling of collapse and water splash out. Freshness and moist feeling are particularly preferably exhibited. And it will become still more preferable from a viewpoint of usability if the viscosity is adjusted to 4000-30000 mPa * s / 30 degreeC (measurement value by a B-type viscosity meter). In addition, it is possible to mix | blend various chemical | medical agents with an oil phase component and an aqueous phase component.

  In the oil-in-water skin cosmetic of the present invention, oils that can be usually blended in an emulsified composition can be blended as appropriate within a range that does not impair the effects of the present invention. Examples of such components include, but are not limited to, hydrocarbon oils, silicone oils, waxes, fatty acid esters, higher alcohols, ultraviolet absorbers, and the like.

  Examples of the hydrocarbon oil include liquid paraffin, ozokerite, squalane, pristane, paraffin, ceresin, squalene, petrolatum, microcrystalline wax, polyethylene wax, and Fischer-Tropsch wax.

  Examples of the silicone oil include linear polysiloxanes (for example, dimethylpolysiloxane, methylphenylpolysiloxane, diphenylpolysiloxane, etc.); cyclic polysiloxanes (for example, decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane, etc.), 3 Silicone resin forming a three-dimensional network structure, silicone rubber having an average molecular weight of 200,000 or more, various modified polysiloxanes (amino-modified polysiloxane, polyether-modified polysiloxane, alkyl-modified polysiloxane, fluorine-modified polysiloxane, etc.) It is done.

  Examples of the waxes include beeswax, candelilla wax, carnauba wax, lanolin, liquid lanolin, jojoballow and the like.

  Examples of fatty acid esters include myristyl myristate, cetyl palmitate, cholesteryl stearate, beeswax fatty acid 2-octyldodecyl, and the like.

  Examples of the higher alcohol include hexyl alcohol, octyl alcohol, cetyl alcohol, stearyl alcohol, ceryl alcohol, behenyl alcohol, triacontyl alcohol, seraalkyl alcohol, and batyl alcohol.

Examples of the ultraviolet absorber include the following compounds.
(1) Benzoic acid ultraviolet absorbers For example, paraaminobenzoic acid (hereinafter abbreviated as PABA), PABA monoglycerin ester, N, N-dipropoxy PABA ethyl ester, N, N-diethoxy PABA ethyl ester, N, N-dimethyl PABA ethyl ester, N, N-dimethyl PABA butyl ester, N, N-dimethyl PABA ethyl ester and the like.
(2) Anthranilic acid-based UV absorbers such as homomenthyl-N-acetylanthranilate.
(3) Salicylic acid ultraviolet absorbers such as amyl salicylate, menthyl salicylate, homomenthyl salicylate, octyl salicylate, phenyl salicylate, benzyl salicylate, p-isopropanol phenyl salicylate, and the like.
(4) Cinnamic acid UV absorbers For example, octyl cinnamate, ethyl-4-isopropyl cinnamate, methyl-2,5-diisopropyl cinnamate, ethyl-2,4-diisopropyl cinnamate, methyl-2,4- Diisopropyl cinnamate, propyl-p-methoxycinnamate, isopropyl-p-methoxycinnamate, isoamyl-p-methoxycinnamate, octyl-p-methoxycinnamate (2-ethylhexyl-p-methoxycinnamate), 2-ethoxy Ethyl-p-methoxycinnamate, cyclohexyl-p-methoxycinnamate, ethyl-α-cyano-β-phenylcinnamate, 2-ethylhexyl-α-cyano-β-phenylcinnamate, glyceryl mono-2-ethylhexanoyl -Diparamethoxycinnamate.
(5) Triazine-based ultraviolet absorber, for example, bisresorcinyl triazine.
More specifically, bis {[4- (2-ethylhexyloxy) -2-hydroxy] phenyl} -6- (4-methoxyphenyl) 1,3,5-triazine, 2,4,6-tris { 4- (2-ethylhexyloxycarbonyl) anilino} 1,3,5-triazine and the like.
(6) Other UV absorbers For example, 3- (4'-methylbenzylidene) -d, l-camphor, 3-benzylidene-d, l-camphor, 2-phenyl-5-methylbenzoxazole, 2,2 '-Hydroxy-5-methylphenylbenzotriazole, 2- (2'-hydroxy-5'-t-octylphenyl) benzotriazole, 2- (2'-hydroxy-5'-methylphenylbenzotriazole, dianisoylmethane, 4-methoxy-4'-t-butyldibenzoylmethane, 5- (3,3-dimethyl-2-norbornylidene) -3-pentan-2-one, pyridazine derivatives such as dimorpholinopyridazinone.

  In addition, as an emulsifier used in the oil-in-water skin cosmetic of the present invention, a combination of a nonionic surfactant of HLB 3-11 and a long-chain acyl acidic glutamate is more preferable from the viewpoint of fresh feeling and stability. preferable.

Specific examples of non-ionic surfactants of HLB 3 to 11 include the following.
As nonionic surfactants of HLB 3 to 11, POE (2) stearyl ether (HLB 4.0), self-emulsifying type propylene glycol monostearate (HLB 4.0), glyceryl myristate (HLB 3.5), monostearic acid Glyceryl (HLB4.0), self-emulsifying glyceryl monostearate (HLB4.0), glyceryl monoisostearate (HLB4.0), decaglyceryl pentastearate (HLB3.5), decaglyceryl pentaisostearate (HLB3.5) ), Decaglyceryl pentaoleate (HLB3.5), monostearate sorbitan (HLB4.7), sorbitan monoisostearate (HLB5.0), sorbitan sesquiisostearate (HLB4.5), sorbitan monooleate (HLB4) 3), hexastearic acid POE (6) sorbite (HLB3.0), POE (3) castor oil (HLB3.0), monostearic acid PEG (2) (HLB4.0), monostearic acid ethylene glycol (HLB3. 5), PEG (2) stearate (HLB4.5) and the like, and hexaglyceryl monomyristate (HLB11), hexaglyceryl monostearate (HLB9.0), hexaglyceryl monooleate (HLB9.0) ), Polyglyceryl fatty acid esters such as decaglyceryl distearate (HLB9.5) and decaglyceryl diisostearate (HLB10.0). Polyoxyethylene glyceryl fatty acid esters such as polyoxyethylene monostearate (hereinafter abbreviated as POE) (5) glyceryl (HLB9.5), monooleic acid POE (5) glyceryl (HLB9.5), and the like. Monostearic acid POE (6) sorbitan (HLB9.5), Tristearic acid POE (20) Sorbitan (HLB10.5), Monooleic acid POE (20) Sorbitan (HLB15.0), Monooleic acid POE (6) Sorbitan Polyoxyethylene sorbitan fatty acid esters such as (HLB 10.0) and trioleic acid POE (20) sorbitan (HLB 11.0). POE (20) castor oil (HLB10.5) POE (20) hydrogenated castor oil (HLB10.5), POE (30) hydrogenated castor oil (HLB11.0), and other polyoxyethylene castor oil and hydrogenated castor oil. Polyoxyethylene sterols and hydrogenated sterols such as POE (5) phytosterol (HLB9.5). POE (2) lauryl ether (HLB9.5), POE (5.5) cetyl ether (HLB10.5), POE (7) cetyl ether (HLB11.5), POE (7) oleyl ether (HLB10.5), POE (10) oleyl ether (HLB14.5), POE (15) oleyl ether (HLB16.0), POE (20) oleyl ether (HLB17.0), POE (50) oleyl ether (HLB18.0), POE ( 10) Behenyl ether (HLB10.0) POE (2) (C12-15) alkyl ether (HLB9.0), POE (4) (C12-15) alkyl ether (HLB10.5), POE (5) secondary alkyl Polyoxyethylene alkyl ethers such as ether (HLB10.5). Polyoxyethylene (hereinafter abbreviated as POE) (1) polyoxypropylene (hereinafter abbreviated as POP) (4) cetyl ether (HLB9.5), POE (10) POP (4) cetyl ether (HLB10.5), Polyoxyethylene polyoxypropylene alkyl ethers such as POE (20) POP (6) decyl tetradecyl ether (HLB11.0). Polyethylene glycol fatty acid esters such as PEG (10) monostearate (HLB11.0) and PEG diisostearate (HLB9.5). Polyoxyethylene glyceryl isostearates such as PEG (8) glyceryl isostearate (HLB 10.0) and PEG (10) glyceryl isostearate (HLB 10.0).

  In the present invention, when the oil-in-water type emulsified skin cosmetic is used, the nonionic surfactant of HLB 3 to 11 is preferably 0.1 to 1.0% by mass. If it is less than 0.1% by mass, there may be a problem in terms of stability, and if it exceeds 1.0% by mass, a problem will occur in terms of usability such as freshness.

  The N-long chain acyl acidic amino acid salt used in the present invention is specifically N-stearoyl-L-glutamic acid, N-palmitoyl-L-glutamic acid, N-stearoyl-aspartic acid, N-palmitoyl-aspartic acid. It is preferable that it is at least one of the monosodium salt or monopotassium salt.

  In the present invention, when the oil-in-water type emulsified skin cosmetic is used, the N-long chain acyl acidic amino acid salt is desirably 0.05 to 1.0% by mass. If the amount is less than 0.05% by mass, the emulsifying property may be insufficient. If the amount exceeds 1.0% by mass, a problem may occur in terms of usability such as freshness.

  In addition to the above-mentioned components, the skin cosmetic of the present invention can be appropriately blended with components that can be usually blended in skin cosmetics as long as the effects of the present invention are not impaired. Specific examples of the components that can be blended are shown below.

  Examples of the polyhydric alcohol include polyethylene glycol, glycerin, diglycerin, 1,3-butylene glycol, erythritol, sorbitol, xylitol, maltitol, 1,2-pentanediol, hexylene glycol and the like.

  Examples of the water-soluble polymer include carrageenan, pectin, mannan, curdlan, chondroitin sulfate, starch, glycogen, gum arabic, sodium hyaluronate, tragacanth gum, xanthan gum, mucoitin sulfate, hydroxyethyl guar gum, carboxymethyl guar gum, guar gum, dextran. , Keratosulfuric acid, locust bean gum, succinoglucan, chitin, chitosan, carboxymethylchitin, agar and the like.

In addition, lower alcohols such as ethanol; antioxidants such as butylhydroxytoluene, δ-tocopherol and phytin; antiseptics such as benzoic acid, salicylic acid, sorbic acid, paraoxybenzoic acid alkyl esters, phenoxyethanol, hexachlorophene, and ε-polylysine; Organic or inorganic acids such as citric acid, lactic acid, hexametaphosphoric acid and their salts; vitamin A, vitamin A palmitate, vitamin A derivatives such as vitamin A acetate, vitamin B ₆ hydrochloride, vitamin B ₆ tripalmitate, vitamin B ₆ dioctanoate , vitamin B ₂ and derivatives thereof, vitamin B _12, vitamin B such as vitamin B ₁₅ and its derivatives, alpha-tocopherol, beta-tocopherol, vitamin E such as vitamin E acetate, vitamin D, vitamin H, Pantote Vitamins such as acid and pantethine; γ-oryzanol, allantoin, glycyrrhizic acid (salt), glycyrrhetinic acid, stearyl glycyrrhetinate, hinokitiol, bisabolol, eucarptone, thymol, inositol, saikosaponin, carrot saponin, hetimasaponin, muclodisaponin Saponins such as, pantothenyl ethyl ether, various drugs such as arbutin, cephalanthin, borage, clara, kohone, orange, sage, yarrow, mallow, thyme, thyme, spruce, birch, sugina, loofah, maronier, yukinoshita, Extracts of plants such as ougon, arnica, lily, mugwort, peonies, aloe, gardenia, cherry leaf, pigments such as β-carotene, and the like can also be blended.

  The skin cosmetic of the present invention is preferably used as an oil-in-water type emulsion product such as a skin care milky lotion and a low viscosity skin care cream. These products can be manufactured by a conventional method by mixing the above-described essential components and components usually blended in cosmetics.

  The present invention will be further described in detail with reference to examples. The present invention is not limited thereby. Unless otherwise specified, the amount is shown in mass%.

  Skin care emulsions (oil-in-water type skin cosmetics) of Examples 1 to 9 and Comparative Examples 1 to 6 having the composition described in “Tables 1 to 3” were produced by a conventional method. About the obtained skin care emulsion, stability and usability (disintegration feeling, freshness, stickiness, penetration feeling) were evaluated by the following test methods. As for the viscosity, the sample was immersed in a 30 ° C. water bath for 1 hour and measured with a B-type viscometer.

[Stability test]
The appearance after standing at 50 ° C. for 1 month was visually observed and judged according to the following evaluation criteria.
(Evaluation criteria)
○: No separation was observed.
Δ: Almost no separation was observed.
X: Separation of the liquid phase (oil phase or water phase) occurred.

[Stable for dispensers]
(Evaluation criteria)
(Double-circle): When it took out from the dispenser left at high temperature, isolation | separation and a lump were not seen at all.
○: Almost no separation or lump was observed when the dispenser was left at a high temperature.
(Triangle | delta): When it took out from the dispenser left at high temperature, isolation | separation or solidification by mouth was seen.
X: Separation or solidification was observed at the mouth when taken out from the dispenser.

[Usability (disintegration)]
An actual use test was conducted by a female panel (10 persons), and the feeling of breakage when extending to the skin was evaluated according to the following evaluation criteria.
(Evaluation criteria)
A: All 10 people judged that there was a feeling of breakage.
○: Seven to nine people determined that there was a feeling of breakage.
(Triangle | delta): Three to six persons judged having a feeling of breakage.
X: It was determined that 0-2 persons had a feeling of breakage.

[Usability (freshness)]
An actual use test was conducted by a panel dedicated to women (10 persons), and freshness was evaluated according to the following evaluation criteria.
(Evaluation criteria)
A: All 10 people judged that there was freshness.
○: Seven to nine people determined that there was freshness.
(Triangle | delta): Three to six persons judged having freshness.
X: It was determined that 0 to 2 persons had freshness.

[Usability (stickiness)]
An actual use test was conducted by a panel dedicated to women (10 persons), and stickiness was evaluated according to the following evaluation criteria.
(Evaluation criteria)
A: All 10 people judged that there was no stickiness and was moist.
○: Seven to nine people judged that there was no stickiness and was moist.
(Triangle | delta): Three to six persons judged that there was no stickiness and was moist.
X: It was determined that 0-2 persons had no stickiness and were moist.

[Usability (permeation: the active ingredient permeates the skin)]
An actual use test was conducted by a panel dedicated to women (10 persons), and the penetrance was evaluated according to the following evaluation criteria.
(Evaluation criteria)
(Double-circle): All 10 persons determined that there was a feeling of penetration.
○: Seven to nine people determined that there was a sense of penetration.
(Triangle | delta): Three to six persons determined that there was a penetrating feeling.
X: 0 to 2 persons determined that there was a sense of penetration.

＊１：下記合成例により得られるアクリルアミド系増粘剤ミクロゲル
「合成例：ジメチルアクリルアミド（興人製）を35gと2-アクリルアミド2-メチルプロパンスルホン酸（Sigma製）17.5gおよびメチレンビスアクリルアミド70mgを260gのイオン交換水に溶解し水酸化ナトリウムでpH=7.0に調節する。還流装置を備えた1000ml三つ口フラスコに、n-ヘキサン260gとポリオキシエチレン（３）オレイルエーテル（エマレックス５０３、日本エマルション製）8.7gおよびポリオキシエチレン（６）オレイルエーテル（エマレックス５０６、日本エマルション製）17.6gを入れ混合溶解しN₂置換する。この三つ口フラスコにモノマー水溶液を添加してN₂雰囲気下で攪拌しながらオイルバスで６５℃〜７０℃に加熱する。系の温度が６５℃〜７０℃に達したところで系が半透明なマイクロエマルション状態になっていることを確認した後、過硫酸アンモニウム2gを重合系に添加し重合を開始する。重合系を６５〜７０℃に３時間攪拌しながら維持することでミクロゲルが生成する。重合終了後ミクロゲル懸濁液にアセトンを加えてミクロゲルを沈殿させ、引き続きアセトンで3回洗浄し、残存モノマーおよび界面活性剤を除去する。沈殿物は濾過後減圧乾燥し、白色粉末状のミクロゲル乾燥物を得る。」
＊２：商品名：ＳＩＭＵＬＧＥＬ ＮＳ（ポリマー実分３５％）（ＳＥＰＰＩＣ社製）
＊３：商品名：Ａｒｉｓｔｏｆｌｅｘ ＡＶＣ（Ｃｌａｒｉａｎｔ社製）

* 1: Acrylamide thickener microgel obtained by the following synthesis example “Synthesis example: 35 g of dimethylacrylamide (manufactured by Kojin), 17.5 g of 2-acrylamide-2-methylpropanesulfonic acid (manufactured by Sigma) and 70 mg of methylenebisacrylamide. Dissolve in 260 g of ion-exchanged water and adjust to pH = 7.0 with sodium hydroxide.In a 1000 ml three-necked flask equipped with a reflux apparatus, 260 g of n-hexane and polyoxyethylene (3) oleyl ether (Emalex 503, Japan) emulsion Ltd.) 8.7 g, and polyoxyethylene (6) oleyl ether (EMALEX 506, manufactured by Nippon emulsion) 17.6 g were mixed and dissolved placed N ₂ substitution. the three-neck flask was added aqueous monomer solution an N ₂ atmosphere While stirring under heat, heat in an oil bath to 65 ° C. to 70 ° C. When the temperature of the system reaches 65 ° C. to 70 ° C., the system is half After confirming that it is in a transparent microemulsion state, 2 g of ammonium persulfate is added to the polymerization system to start polymerization, and a microgel is formed by maintaining the polymerization system at 65 to 70 ° C. with stirring for 3 hours. After completion of the polymerization, acetone is added to the microgel suspension to precipitate the microgel, followed by washing with acetone three times to remove residual monomers and surfactants. Get a dry product. "
* 2: Product name: SIMULGEL NS (35% polymer) (SEPPIC)
* 3: Product name: Aristoflex AVC (manufactured by Clariant)

  As is clear from the results in Tables 1 to 3, it can be seen that the skin care emulsions of Examples 1 to 9 according to the present invention have excellent stability and usability.

  The rheological properties of Example 4 in Table 1 are shown in FIG. From this graph, it can be seen that despite the high viscosity yield value, the subsequent stress is low (the slope of shear stress decreases with the viscosity yield value). This indicates that it is easy to collapse when applied with a finger and is easy to apply. That is, when the skin cosmetic of the present invention is stretched on the skin (a load is applied with a finger), the skin cosmetic is easily broken and stretched, and when it is broken and stretched, it gives a fresh application feeling such as water splashing. .

  Other examples of the present invention will be shown below.

Example 13 Skin Care Cream (Compounding ingredient)
(1) Ion exchange water Residue (2) Sodium hexametaphosphate 0.1
(3) Sodium carbonate decahydrate 0.2
(4) Sodium lactate 0.05
(5) Tranexamic acid 1.0
(6) Sodium hydroxide 0.03
(7) Titanium oxide (rutile type, particle size 0.25 μ) 1.0
(Product name: Taipei CR-50 (Ishihara Sangyo Co., Ltd.))
(8) 1,3-butylene glycol 5.0
(9) Glycerin 3.0
(10) Acrylamide thickener 2.5
(Product name: Sepigel 305 (actual content 40%) (manufactured by SEPPIC))
(11) Carboxyvinyl polymer 0.03
(12) N-stearoyl-potassium aspartate 0.1
(13) Phenoxyethanol 0.5
(14) Water-soluble collagen appropriate amount (15) Self-emulsifying glyceryl monostearate 0.5
(16) Sorbitan tristearate 0.1
(17) Behenic acid 0.4
(18) Myristic acid 0.2
(19) (Hydroxystearic acid / stearic acid / rosinic acid) 0.1
Dipentaerythrityl (trade name: Cosmol 168E, manufactured by Nisshin Oilio Co., Ltd.)
(20) α-olefin oligomer 2.5
(21) Glyceryl tri-2-ethylhexanoate 1.5
(22) Dimethylpolysiloxane 0.3
(23) Octocrylene 0.1
(24) Perfume appropriate amount <Production method>
(15) to (24) were uniformly mixed and dissolved at 70 ° C. (oil phase). On the other hand, (1) to (14) were uniformly mixed and dissolved at 70 ° C. (aqueous phase). The mixture was emulsified with a homomixer while gradually adding the oil phase to the aqueous phase maintained at 70 ° C. When the emulsification was completed, the emulsion was rapidly cooled to 40 ° C. or lower to obtain a target skin care cream having a viscosity of 30000 mPa · s / 30 ° C.
<Product properties>
The obtained skin care cream was evaluated in the same manner as in Examples 1 to 9. As a result, it was excellent in usability (usability evaluation, spreading on the skin, stickiness, freshness, penetrating feeling ◎), and stability was also good. (Stability evaluation: ○).

Example 14 Skincare emulsion (formulation component)
(1) Ion exchange water Residual (2) Sodium hexametaphosphate 0.05
(3) Sodium lactate 0.01
(4) Sodium carbonate (anhydrous salt) 0.05
(5) Ascorbic acid glucoside 0.2
(6) Potassium hydroxide 0.05
(7) Titanium oxide (rutile type, particle size 0.25 μ) 1.0
(Product name: Taipei CR-50 (Ishihara Sangyo Co., Ltd.))
(8) Dipropylene glycol 5.0
(9) 1,3-butylene glycol 9.0
(10) Glycerol 3.0
(11) Acrylamide thickener (obtained in the synthesis example of Table 1) 0.1
(12) Carboxyvinyl polymer 0.1
(13) Celtrol: 0.05
(14) Phenoxyethanol 0.5
(15) Erythritol 0.1
(16) cholesteryl hydroxystearate appropriate amount (17) glyceryl stearate 0.3
(18) Stearic acid 0.4
(19) Myristic acid 0.2
(20) Cetostearyl alcohol 0.3
(21) Hydrogenated palm oil 0.6
(22) Liquid paraffin 5.0
(23) Methylpolysiloxane 20 mPa · s 0.1
(24) Sodium pyrosulfite 0.005
(25) Perfume appropriate amount <Production method>
(16) to (25) were uniformly mixed and dissolved at 70 ° C. (oil phase). On the other hand, (1) to (15) were uniformly mixed and dissolved at 70 ° C. (aqueous phase). The mixture was emulsified with a homomixer while gradually adding the oil phase to the aqueous phase maintained at 70 ° C. When the emulsification was completed, the emulsion was rapidly cooled to 40 ° C. or lower to obtain a target skin care emulsion having a viscosity of 10000 mPa · s / 30 ° C. and placed in a dispenser container to obtain a dispenser-specific skin care emulsion.
<Product properties>
The obtained skin care emulsion was evaluated in the same manner as in Examples 1 to 9. As a result, it was excellent in usability (usability evaluation, spread on the skin, stickiness, freshness, penetrating feeling ◎), and stability was also good. (Stability evaluation: ○).

  According to the present invention, an acrylamide-based thickener and a carboxyvinyl polymer are used in combination as a thickener to give a feeling of breakage and freshness. Therefore, by using sodium carbonate, stability and usability are extremely excellent. A composition is obtained, and this composition is suitably used as a skin cosmetic.

  With respect to stability, there is no separation such as oil floating even when stored with time at 50 ° C. or by centrifugation, and the stability over time is extremely excellent.

  In addition, the usability has particularly excellent characteristics in terms of usability such as a feeling of breakage, freshness, non-stickiness, and excellent feeling of penetration of the active ingredient into the skin (penetration feeling). And by using sodium lactate, since especially fresh feeling can be further increased, the effect of the present invention is further improved.

  Furthermore, when the skin cosmetic of the present invention is filled in a dispenser container, the effect of the present invention is further improved because xanthan gum can be provided with good stability.

It is a graph of the rheological characteristic of the skin cosmetics of Example 4.

Claims (7)

  (A) Acrylamide thickener 0.1-1.0% by mass, (b) Carboxyvinyl polymer 0.01-1.0% by mass, (c) Sodium carbonate 0.01-3.0% by mass And (d) a skin cosmetic characterized by containing water.   The (a) acrylamide type thickener is vinylpyrrolidone / 2-acrylamido-2-methylpropanesulfonic acid copolymer, dimethylacrylamide / 2-acrylamido-2-methylpropanesulfonic acid copolymer, acrylic acid amide / 2. -Acrylamide-2-methylpropanesulfonic acid copolymer, mixture of polyacrylic acid amide and sodium polyacrylate, sodium acrylate / 2-acrylamido-2-methylpropanesulfonic acid copolymer, ammonium polyacrylate, polyacrylamide The skin cosmetic according to claim 1, which is one or two or more thickeners selected from the group consisting of: a copolymer / ammonium acrylate copolymer and an acrylamide / sodium acrylate copolymer.   The skin cosmetic according to claim 1 or 2, further comprising (e) xanthan gum.   The skin cosmetic according to any one of claims 1 to 3, further comprising (f) sodium lactate.   The skin cosmetic according to any one of claims 1 to 4, wherein the viscosity of the skin cosmetic is 4000 to 30,000 mPa · s at 30 ° C.   The skin cosmetic according to any one of claims 1 to 5, wherein the skin cosmetic is an oil-in-water emulsified cosmetic. The skin cosmetic according to any one of claims 1 to 6, wherein the skin cosmetic container is a dispenser.

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