pigment dispersion for aqueous cosmetic compositions, and aqueous cosmetic composition using same

Abstract

Pigment dispersion for aqueous cosmetic compositions, and aqueous cosmetic composition using same A pigment dispersion for aqueous cosmetic compositions and an aqueous cosmetic composition, the pigment dispersion comprising at least one aluminum lake such as Red No. 40; at least one dispersant selected from poly(organic acids) and their salts, and non-ionic surfactants; and water and a water-soluble organic solvent.

Description

Title of the invention: pigment dispersion for aqueous cosmetic compositions, and aqueous cosmetic composition using same Technical field

[0001] The present invention relates to: a pigment dispersion for aqueous cosmetic compositions, having excellent characteristics of dispersibility of aluminum lake pigments, such as Red No. 40, and stability over time; and an aqueous cosmetic composition using it. Technical background

[0002] A large number of dye or pigment-containing materials have usually been used as coloring materials of makeup cosmetics such as eyeliners and eyebrow cosmetics which are applied to keratinous surfaces of the skin and the like. However, dyes are currently avoided and are not used in many cases because they may leave a color after use by causing smearing on the keratinous surfaces of the skin and the like. The present applicant has realized makeup cosmetics such as eyeliners and eyebrow cosmetics which have a low viscosity of 15 mPa.s or less at a shear rate of 192 s1 by adjusting an iron oxide type pigment such as red iron oxide to have an extremely small particle size of 30 nm to 100 nm, and using an anionic polymer dispersant and an acid having a molecular weight of 300 or less (PTL 1)..

[0003] These makeup cosmetics, however, have a limitation in the development of the color due to the use of the pigment, and there are problems in terms of, for example, shading and reproducibility of the color.

[0004] On the other hand, liquid cosmetics containing a colorant and the like exhibit good color development and have no problem in shading and reproduction of the shade; however, as described above, they have problems not only in smearing property on keratin surfaces but also in light resistance and the like. Therefore, a pigment lake such as Red No. 40 is used, in which a colorant is converted into a salt by a reaction with a metal such as aluminum and thus made insoluble in water (PTL 2).

[0005] However, in this literature, the pigment is preferably in the form of large particles having a size of up to 500 pm and, with respect to the characteristics of a cosmetic, there is disclosed an emulsion-type cosmetic having an extremely high viscosity (27,000 cPa to 434,000 cPa). It is extremely difficult to incorporate such a cosmetic into a so-called pen-type cosmetic product used as an eyeliner to draw fine lines, and ease of handling during use is poor.

[0006] Similarly, a cosmetic has been disclosed in which an organic pigment such as an aluminum lake is combined in a composition having a high viscosity, from 1.5 Pa.s to 3.0 Pa.s preferably at a shear rate of 100 s 1 (PTL 3).

[0007] The cosmetic disclosed in this literature has a very high viscosity, although lower than that of the cosmetic of PTL 2. Nevertheless, it is said that it is difficult to apply this cosmetic evenly and smoothly.

[0008] It has further been disclosed to add an organic pigment such as an aluminum lake to a cosmetic in stick form, or in press-molded powder, or in loose powder (PTL 4).

[0009] Even in this form, good performance in terms of developing a bright color and reproducibility of the color is obtained; however, it is said that it is difficult to apply the cosmetic evenly and smoothly in the form of a neat line.

[0010] List of quotes

[0011] Patent Literature

[0012] PTL 1: Japanese Unexamined Patent Publication (Kokai) No. 2015-164912 (claims, examples, abstract, etc.)

[0013] PTL 2: Unexamined publication of Japanese patent application (translation of PCT application) No. 2012-504570 (claims, paragraphs

[0050] ,

[0251] , etc.).

[0014] PTL 3: Japanese Unexamined Patent Publication (Kokai) No. 2023-88285 (claims, paragraphs

[0037] ,

[0038] ,

[0039] , etc.).

[0015] PTL 4: Japanese Patent No. 7287458 (claims

[0045] ,

[0055] , examples, etc.).

[0016] Summary

[0017] Technical problem

[0018] In view of the foregoing, the present invention aims to solve the conventional problems described above and the like, and an object of the present invention is to provide: a pigment dispersion for aqueous cosmetic compositions, having excellent characteristics of color development of pigments such as Red No. 40, color reproducibility, applicability, dispersibility of aluminum lake pigments, and stability over time; and an aqueous liquid composition using the same, suitable for eyeliners, eyebrow cosmetics, and the like.

[0019] Solution to the problem

[0020] The present inventor has intensively studied the above-described and analogous conventional problems, and has consequently developed: a pigment dispersion for aqueous cosmetic compositions, characterized in that it contains at least one aluminum lake, a dispersant, and water; and an aqueous cosmetic composition, thereby carrying out the present invention. Furthermore, the present inventor has discovered that by using a composition which contains at least one aluminum lake in an amount of 0.00025 to 30.00% by mass, 0.05 to 15.00% by mass of a dispersant, and at least 2.50 to 30.00% by mass of a film-forming agent, the above-described target pigment dispersion for aqueous cosmetic compositions and an aqueous cosmetic composition using the same, which is suitable for an eyeliner composition, an eyebrow cosmetic, or the like, can be obtained, thereby carrying out the present invention.

[0021] The dispersant described above is preferably chosen from poly(organic acids) and their salts, and non-ionic surfactants.

[0022] The aqueous cosmetic composition described above preferably has a viscosity of 1.5 mPa.s to 20.0 mPa.s at 25°C and at a shear rate of 192 s1.

[0023] [Advantageous effects of the invention]

[0024] According to the present invention, there is provided the following: a pigment dispersion for aqueous cosmetic compositions, having excellent dispersibility and time stability characteristics of aluminum lake pigments, such as Red No. 40; and an aqueous cosmetic composition using the same, having excellent color development characteristics, color reproducibility, and applicability, and suitable for eyeliners, eyebrow cosmetics, and the like. Brief description of the drawings

[0025] [Fig.l] is a longitudinal cross-sectional view illustrating an exemplary embodiment of the rotary feed type liquid cosmetic applicator A of the present invention in a state before use.

[0026] [Fig. 2] is a partial cross-sectional view illustrating an exemplary embodiment of the manifold type B direct feed liquid cosmetic applicator of the present invention.

[0027] [Fig. 3] is a partial cross-sectional view illustrating an exemplary embodiment of the inner cotton type liquid cosmetic applicator C of the present invention.

[0028] [Fig.4A] illustrates a front view of an exemplary embodiment of the tapping type liquid cosmetic applicator D of the present invention in a state before use.

[0029] [Fig.4B] illustrates a cross-sectional view of an exemplary embodiment of the tapping-type liquid cosmetic applicator D of the present invention in a state before use.

[0030] Description of embodiments

[0031] Embodiments of the present invention will now be described in detail.

[0032] The aqueous pigment dispersion for aqueous cosmetic compositions according to the present invention is characterized in that it contains at least: an aluminum lake; at least one dispersant chosen from poly(organic acids) and their salts, and non-ionic surfactants; and water.

[0033] The aqueous cosmetic composition according to the present invention, which is suitable for an eyeliner composition, an eyebrow cosmetic, or the like, is characterized in that it contains at least: an aluminum lake in a proportion of 0.00025 to 30.00% by mass; 0.05 to 15.00% by mass of a dispersant selected from poly(organic acids) and their salts, and non-ionic surfactants; and at least 2.50 to 30.00% by mass of a film-forming agent.

[0034] As described above, the aluminum lake pigment used in the present invention is a coloring material generally used in cosmetics and examples thereof include Red No. 40, Blue No. 1, and Yellow No. 4.

[0035] For example, an aqueous dispersion of Red No. 40 requires a long dispersion time, and has problems of low productivity, poor stability over time, and the like; however, these problems are solved by enabling the dispersion to have the formulation characteristics of the present invention.

[0036] From the viewpoint of post-dispersion stability and convenience in the production of a cosmetic, it is desirable that the content of Red No. 40, Blue No. 1 or Yellow No. 4 is preferably 1 to 32% by mass, more preferably 2 to 25% by mass, relative to the total amount of the pigment dispersion for aqueous cosmetic compositions.

[0037] By controlling the content of Red No. 40, Blue No. 1 or Yellow No. 4 to be 1% by mass or more, not only is excellent productivity achieved, but also excellent coloring property is obtained when the pigment dispersion is added to a cosmetic, while by controlling the content to be 32% by mass or less, dispersibility and stability over time are further improved.

[0038] In the present invention, water is mainly used as a dispersion medium and solvent, and a water-soluble organic solvent can further be used. The usable water-soluble organic solvent is used as a dispersion medium for pigment dispersion for aqueous cosmetic compositions and as a cosmetic solvent, and examples thereof include lower alcohols having 5 or fewer carbon atoms. Specifically, the water-soluble organic solvent may be, for example, at least one (or a mixture of two or more) of methyl alcohol (methanol), ethyl alcohol (ethanol), n-propyl alcohol, isopropyl alcohol, n-butyl alcohol, sec-butyl alcohol, tert-butyl alcohol, isobutyl alcohol, pentyl alcohol, ethylene glycol, propylene glycol, butylene glycol, and the like.

[0039] Particularly from the point of view of safety, ease of handling, and the like, it is desirable to use ethyl alcohol (ethanol).

[0040] From the viewpoint of the dissolved stability of the dispersant described below as well as from the viewpoint of the stability of the pigment dispersion, particularly the low-temperature stability, the content of the water-soluble organic solvent to be used is desirably 1.0 to 15.0 mass% relative to the total amount of the pigment dispersion for aqueous cosmetic compositions. It is desirable that the content of the water-soluble organic solvent together with water is more preferably 50.0 to 90.0 mass%, more preferably 60.0 to 80.0 mass%.

[0041] By controlling the added amount of the water-soluble organic solvent to be 1.0 mass% or more, not only can an effect of preventing the solvent from freezing at low temperatures be exerted, but also an antiseptic effect, however slight, is exerted. When the added amount is controlled to be 15.0 mass% or less, neither an adverse effect on the film-forming agent described below nor irritation to the skin during use is observed. By controlling the content of water and the water-soluble organic solvent to be 50.0 mass% or more, a reduction in viscosity can be achieved and an antiseptic effect, however slight, is exerted, while by controlling the content to be 90.0 mass% or less, the dissolved stability of the dispersant described below is further improved.

[0042] The dispersant used in the present invention is a component which improves the dispersibility of an aluminum lacquer such as Red No. 40 and the stability over time of the aluminum lacquer in a dispersion.

[0043] The dispersant, which is a poly(organic acid) or a salt thereof, a water-soluble nonionic polymer, or a nonionic surfactant, contains a hydrophilic group in the molecule and is dissolved in water and a water-soluble solvent because of the hydrophilic group. Particles of an aluminum lake pigment such as Red No. 40 are obtained by mixing a tar dye and an aluminum salt which are soluble in water, and forming a lake; it is therefore believed that the particles of the aluminum lake are capable of forming hydrogen bonds with the hydrophilic group of the above-described dispersant, and the hydrogen bonds exist in such a way as to envelop the particles of the aluminum lacquer even in water and water-soluble solvent.

[0044] In the invention, by implementing a dispersion process in water and a water-soluble solvent in the presence of a poly(organic acid) and a salt thereof, a water-soluble non-ionic polymer, or a non-ionic surfactant, the dispersibility of an aluminum lacquer such as Red No. 40 and the stability over time of the aluminum lacquer in a dispersion are improved.

[0045] Examples of poly(organic acids) and salts thereof that can be used include: poly(lactic acid) and its salts; poly(phosphoric acid) and its salts; poly(acrylic acid) and its salts; and poly(aspartic acid) and its salts. Examples of the poly(organic acid) acid salt to be used include the salts of the poly(lactic acid), poly(phosphoric acid), poly(acrylic acid), and poly(aspartic acid) described above, and the poly(organic acid) salt may be any salt that contains at least one or more of the salts illustrated above. Examples of these types of salts include alkali metal salts, alkaline earth metal salts, ammonium salts, and alkanolamine salts, of which sodium salts, potassium salts, and lithium salts are particularly preferred.Among the poly(organic acids) and their salts illustrated above, especially poly(acrylic acid) and its salts, and poly(aspartic acid) and its salts, have excellent dispersion stability, and poly(sodium acrylate) and poly(sodium aspartate) are particularly desirable. Examples of commercially available poly(acrylic acid) products include POLYACRYLIC ACID 5,000 (manufactured by FUJIFILM Wako Pure Chemical Corporation) and AQUALIC H (manufactured by Nippon Shokubai Co., Ltd.).

[0046] Examples of water-soluble nonionic polymers and acrylate copolymers that can be used include AMPHOMER HC (manufactured by Nouryon Japan KK), LUVIMER 100P (alkyl acrylate copolymer, manufactured by BASF Ltd.), and ACULYN 33A Rheology Modifier (manufactured by Dow Chemical Japan, Ltd. / Dow Toray Co., Ltd.).

[0047] Examples of nonionic surfactants that may be used include NIKKOL BB30 (30-mol polyoxyethylene behenyl adduct) and NIKKOL BC-20 (20-mol polyoxyethylene cetyl adduct) (both manufactured by Nikko Chemicals Co., Ltd.).

[0048] From the viewpoint of improving the dispersibility of an aluminum lake such as Red No. 40 and the stability over time of the aluminum lake in a dispersion, the content of the dispersant to be used is preferably 0.05 to 17.00% by mass relative to the total amount of the pigment dispersion for aqueous cosmetic compositions, preferably in terms of solid content.

[0049] By controlling the dispersant content to be 0.05 mass%, not only is the dispersed state of an aluminum lake such as Red No. 40 stabilized, but also the adhesion of a pigment and the like when mixed in a cosmetic is improved. Furthermore, by controlling the dispersant content to be 17.00 mass% or less, 16.50 mass% or less, 16.00 mass% or less, 15.50 mass% or less, or 15.00 mass% or less, an increase in viscosity is inhibited, so that the practicality in producing a cosmetic is further improved.

[0050] In the present invention, it is desired that the mixing ratio of the above-described aluminum lacquer to be used, such as Red No. 40, and the dispersant (aluminum lacquer such as Red No. 40 / dispersant) is more preferably from 2 / 1 to 100 / 1 in terms of mass ratio.

[0051] By setting this ratio at a value of 2 / 1 to 100 / 1, a pigment dispersion for aqueous cosmetic compositions is obtained which can meet the dispersibility and stability over time of aluminum lake such as Red No. 40, both at higher levels.

[0052] As for the water serving as the solvent of the present invention, distilled water, ion-exchanged water, purified water, pure water, or ultrapure water may be used, for example. The ratio of this water to all solvents (water + water-soluble organic solvent) should be 30 to 95% by mass (0.30 to 0.95), and is preferably 60 to 95% by mass.

[0053] When the ratio of water to all solvents is less than 30 mass% (0.30), the stability over time is poor, and the pigment cannot be dispersed, while when this ratio is more than 95 mass% (0.95), the solvents other than water which are originally contained in the respective components make it impossible to produce a pigment dispersion.

[0054] The pigment dispersion for aqueous cosmetic compositions according to the present invention which is configured in the manner described above can solve the problems of, for example, long dispersion time and poor time stability of aluminum lakes which are pigments, such as Red No. 40, in the dispersion, and provides a pigment dispersion for aqueous cosmetic compositions having excellent characteristics not only of dispersibility of aluminum lakes such as Red No. 40 but also of time stability.

[0055] This pigment dispersion for aqueous cosmetic compositions is suitably used in cosmetic applications where an aluminum lake such as Red No. 40 is used, and examples of preferred applications include skin care cosmetics, hair cosmetics, antiperspirant cosmetics, makeup cosmetics, UV protection cosmetics, and nail cosmetics, for example: basic skin care cosmetics, such as milk, creams, lotion, sunscreen agents, tanning agents, anti-acne cosmetics, and essences; makeup cosmetics, such as foundations, eye shadows, eyeliners, eyebrow cosmetics, mascaras, blushes, nail polishes, nail treatments, various nail gels, and lipsticks; rinse-off products; conditioners; hair dyes; styling agents; hair rejuvenators; deodorants; and perfumes.Furthermore, the form of a product is not particularly limited, and since the pigment dispersion for aqueous cosmetic compositions is a dispersed (aqueous) liquid, it can be applied to aqueous products in the form of a liquid, an emulsion, a cream, a paste, a gel, a mousse, a spray, or the like.

[0056] In particular, the pigment dispersion for aqueous cosmetic compositions according to the present invention, due to its dispersion characteristics and the like, is preferably used in aqueous cosmetic compositions, such as eyeliners, eyebrow cosmetics, mascaras, and water-based nail polishes.

[0057] The pigment dispersion for aqueous cosmetic compositions according to the present invention can be prepared by mixing the above-described aluminum lake such as Red No. 40 and a dispersant with a film-forming agent, water, a water-soluble organic solvent, and other components under suitable dispersion conditions, for example, using a dispersing device such as a Homomixer, a sand mill, an ultrasonic homogenizer, or a high-pressure homogenizer, and the average particle size of the aluminum lake pigment such as Red No. 40 in the resulting cosmetic (after dispersion) can be adjusted to be 150 nm to 350 nm. The average particle size may exceed 350 nm as long as a stable dispersed system can be obtained.

[0058] The cosmetic according to the present invention contains the water-soluble organic solvent, an aluminum lake such as Red No. 40, a dispersant, water, and a water-soluble organic solvent described above, and for the purpose of further improving the dispersibility and dissolved stability of each component, a pH modifier, a surfactant, a viscosity modifier, a chelating agent, and the like may be used as required.

[0059] Furthermore, the pigment dispersion for aqueous cosmetic compositions according to the present invention can be produced by the steps of mixing components, such as the water-soluble organic solvent, an aluminum lake such as Red N ° 40, a dispersant, and water, described above, in the respective content ranges described above, uniformly stirring and mixing the resulting product, and then dispersing the components by means of a Homomixer or the like.

[0060] For example, an aqueous cosmetic composition may be prepared by mixing under agitation an aluminum lake such as Red No. 40, the various additives described above, and a solvent such as water, until homogeneous, using a general purpose dispersing device or the like, and then further mixing the resulting product until homogeneous using a dispersing device or the like.

[0061] As a specific embodiment of the aqueous cosmetic composition according to the present invention, the use of the aqueous cosmetic composition in an eyeliner will now be described.

[0062] Examples of the eyeliner composition include a composition that contains at least: the above-described pigment dispersion for aqueous cosmetic compositions that contains an aluminum lake such as Red No. 40; a general-purpose eyeliner component, such as a film-forming agent; and if necessary a thickener, a pH modifier, water, and a water-soluble organic solvent such as a lower alcohol. Depending on the color variation of the eyeliner composition, if necessary, the eyeliner composition may further contain a colorant other than the aluminum lake such as Red No. 40.

[0063] From the viewpoints of effects, solubility, storage stability, and the like, it is desirable that the content of the pigment dispersion for aqueous cosmetic compositions which contains the aluminum lake such as Red No. 40 is preferably 0.5 to 30.0% by mass, more preferably 1.0 to 25.0% by mass, relative to the total amount of the eyeliner composition.

[0064] As a colorant other than aluminum lake such as Red No. 40, any pigment generally used in eyeliners may be used, and examples thereof include: inorganic pigments, such as carbon black, black titanium oxide, yellow iron oxide, black iron oxide, red iron oxide, ultramarine blue, iron blue, chromium oxide, chromium hydroxide, carmine, and shikonin;and organic pigments, for example barium lake pigments, calcium lake pigments or zirconium lake pigments of water-soluble dyes such as Red No. 2, Red No. 3, Red No. 102, Red No. 104(1), Red No. 105(1), Red No. 106, Red No. 227, Red No. 230(1), Red No. 230(2), Red No. 231, Red No. 232, Yellow No. 5, Yellow No. 202(1), Yellow No. 202(2), Yellow No. 203, Green No. 3, Green No. 201, Green No. 204, Green No. 205, Blue No. 2, Blue No. 202, Blue No. 205, Orange No. 205, Orange No. 207, and Brown No. 201, as well as Red N° 201, Red N° 202, Red N° 203, Red N° 204, Red N° 205, Red N° 206, Red N° 207, Red N° 208, Red N° 215, Red N° 218, Red N° 219, Red N° 220, Red N° 221, Red N° 223, Red No. 225, Red No. 226, Yellow; No. 201, Yellow No. 204, Yellow No. 205, Green No. 202, Blue No. 201, Blue No. 204, Blue No. 404, Orange No. 201, Orange No. 203, Orange No. 204, Orange No. 206, Orange No. 401, Orange No. 402, Orange No. 403, and Violet No. 201. One or more of these dyes may be used.

[0065] When any of these colorants is used, from the viewpoints of the density of the drawn lines, the ease of shading, the storage stability, and the like, the content of the colorant is 0.1 to 25.0% by mass relative to the total amount of the eyeliner composition.

[0066] As a film-forming agent which can be specifically used, it is desirable to use an aqueous emulsion preferably of an acrylic acid-based polymer.

[0067] Examples of the aqueous emulsion of an acrylic acid-based polymer include alkyl acrylate copolymer emulsions, such as YODOSOL GH800F (manufactured by Nouryon Japan KK, product name, solid concentration: 45% by mass), YODOSOL GH810F (manufactured by Nouryon Japan KK, product name, solid concentration: 46% by mass), YODOSOL GH34F (manufactured by Nouryon Japan KK, product name, solid concentration: 42% by mass), and DAITOSOL 5000SJ (manufactured by Daito Kasei Kogyo Co., Ltd., product name, solid concentration: 50% by mass). For example, COVACRYL MS 11 (manufactured by Sensient Technologies Corporation, solids content: 57%) can be used, which is an alkyl acrylate copolymer emulsion. Examples of an alkyl acrylate-styrene copolymer emulsion include YODOSOL GH41F (manufactured by Nouryon Japan KK, product name, solids concentration: 45% by mass), DAITOSOL 5000STY (manufactured by Daito Kasei Kogyo Co., Ltd., product name, solids concentration: 50% by mass), and EMUPOLY CE-119N (sold by Nikko Chemicals Co., Ltd., product name). Examples of an alkyl acrylate-vinyl acetate copolymer emulsion include VINYSOL 2140L (manufactured by Daido Chemical Corporation, product name, solids concentration: 45% by mass). .

[0068] From the viewpoints of water resistance, adherence of drawn lines, applicability, and the like, it is desirable that the content of these resins be 3.0 to 20.0% by mass, preferably 5.0 to 15.0% by mass, relative to the total amount of the eyeliner composition, in terms of solid content.

[0069] The water-soluble organic solvent which may be further added may be, for example, a lower alcohol. A lower alcohol may preferably be used because of its low-temperature stability, drying properties, low irritation, and the like. Specifically, the water-soluble organic solvent may be, for example, at least one (or a mixture of two or more) of methyl alcohol (methanol), ethyl alcohol (ethanol), n-propyl alcohol, alcohol isopropyl alcohol, n-butyl alcohol, sec-butyl alcohol, tert-butyl alcohol, isobutyl alcohol, pentyl alcohol, ethylene glycol, propylene glycol, butylene glycol, and the like.

[0070] In particular, from the points of view of safety, ease of handling, and the like, it is desirable to use ethyl alcohol (ethanol).

[0071] The content of the lower alcohol is preferably 1 to 80% by mass, more preferably 1 to 40% by mass, more particularly 5 to 20% by mass, relative to the total amount of the eyeliner composition.

[0072] It is noted here that the pH can be suitably adjusted with a pH modifier or the like until an alkali-soluble type acrylic resin is dissolved. As the pH modifier, for example, 2-amino-2-methyl-1-propanol, 2-amino-2-methyl-1,3-propanediol, triethanolamine, L-arginine, ammonia, or sodium hydroxide can be used, and the particularly preferred pH modifier is ammonia or 2-amino-2-methyl-1-propanol.

[0073] The remainder of the eyeliner composition is adjusted with water (e.g., purified water, distilled water, ion-exchanged water, pure water, or tap water).

[0074] As regards the content of this water, it is desirable that the ratio of water to all solvents (water + water-soluble organic solvent) is preferably 30 to 95% by mass (0.30 to 0.95), more preferably 30 to 80% by mass.

[0075] When the ratio of water to all solvents is less than 30 mass% (0.30), the stability over time is poor, and the dissolved stability deteriorates with the addition of a water-soluble component, while when the ratio is more than 95 mass% (0.95), it is very likely that the antibacterial property is poor.

[0076] The eyeliner composition configured in the manner described above contains at least the pigment dispersion for aqueous cosmetic compositions described above, which contains Red No. 40, a film-forming agent, water and a water-soluble organic solvent, and a pH modifier and the like. The eyeliner composition may further contain, if desired, other raw materials such as a thickener, a surfactant, a preservative, a UV absorber, an antioxidant, a reduction inhibitor, a chelating agent, an oil component, a fragrance, and an animal / plant extract, within a range not detrimental to the effects of the present invention.

[0077] Examples of a usable antimicrobial agent include parabens, sodium dehydroacetate, phenoxyethanol, and 1,2-hexanediol. The antimicrobial agent in the present invention contains a preservative, and as the paraben serving as a preservative, for example, p-hydroxybenzoate can be used. methyl p-hydroxybenzoate, ethyl p-hydroxybenzoate, propyl p-hydroxybenzoate, butyl p-hydroxybenzoate, or isopropyl p-hydroxybenzoate, in an appropriate amount.

[0078] From the viewpoints of applicability, storage stability, inhibition of pigment precipitation, and the like, examples of a usable thickener include: cellulose-based thickeners, such as hydroxyethylcellulose, hydroxypropylmethylcellulose, stearoxyhydroxypropylmethylcellulose, hydroxypropyl guar, hydroxypropyltrimonium chloride, and cationized cellulose in which a cationic functional group is added to cellulose; resin-based thickeners, such as polyvinyl alcohol and acrylic acid; clay-based thickeners, such as bentonite; and polysaccharide-based thickeners, such as xanthan gum.

[0079] From the viewpoints of improving adhesion such as suitable viscosity and water resistance and improving usability and applicability for use in an applicator, as well as from the viewpoints of discharge properties and applicability to the eye area in the case of using the eyeliner composition in an automatic pen-type applicator, the eyeliner composition desirably has a viscosity at 25°C (plane-cone type viscometer: 50 rpm; shear rate # 192 s *) of 1.0 to 200 mPa.s, preferably 1.5 to 40 mPa.s, more preferably 1.5 to 15.0 mPa.s.

[0080] The viscosity can be adjusted to be within the above-described range (1.0 to 200 mPa.s) by adjusting the amounts of the respective components to be used described above, the type and amount of the above-described thickener to be preferably used, and the like.

[0081] By controlling the viscosity of the eyeliner composition to be 1.0 mPa.s or more, the occurrence of liquid leakage from a container or the like can be made unlikely, and the stability of a drawn line after application is improved, while by controlling the viscosity of the composition to be 200 mPa.s or less, the user's operation can discharge the composition in an appropriate liquid amount.

[0082] The eyeliner composition of the present embodiment can be prepared by any conventional method, and an eyeliner composition having a viscosity and pH within the respective preferred ranges described above can be produced by combining the pigment dispersion for aqueous cosmetic compositions, described above, which contains Red No. 40, with components such as a film-forming agent, water, a water-soluble organic solvent, and an antimicrobial agent, in the respective content ranges described above, and stirring and uniformly mixing the resulting product using a suitable mixer or the like.

[0083] To use the eyeliner composition of the present embodiment which is configured in the manner described above, a general-purpose cosmetic applicator can be used, and the shape, structure, and the like of the cosmetic applicator to be used are not particularly limited. Examples of the cosmetic applicator include an applicator equipped with a tapping-type valve device, a hair mascara-type applicator, a tube-type applicator, and an applicator equipped with a piston pressing mechanism.

[0084] The resulting aqueous cosmetic composition may be stored in a pen-type applicator having a brush as an application part. For example, the aqueous cosmetic composition may be used by storing (filling) it in a pen-type liquid cosmetic applicator (container) having a brush, a pen core, or the like, as an application part.

[0085] The liquid cosmetic applicator that can be used is not particularly limited as long as it is, for example, a liquid cosmetic applicator equipped with a brush or a pen core for eyeliners or eyebrows.

[0086] A preferred example of such a liquid cosmetic applicator is an applicator which comprises a container to be filled with a liquid cosmetic and is equipped with an application body serving as an application means which consists of a brush (brush pen) or a pen core for eyeliners or eyebrows, and a resilient rubber, elastomer, or closed-cell foam.

[0087] Specifically, it is desirable to use a liquid cosmetic applicator having excellent usability, convenience, and applicability, having any one of a rotary feed type, a collector type, a cosmetic-embedded type, and a tapping type, which are illustrated in [Fig. 1], [Fig. 2], [Fig. 3], and Figures 4A and 4B, respectively.

[0088] As illustrated in [Fig.l], a rotation-feed type liquid cosmetic applicator A comprises an application part 23 formed of a brush (brush pen), which is disposed in front of a cosmetic storage container 11 serving as a reservoir from which the liquid cosmetic of the present invention (hereinafter simply referred to as "liquid cosmetic") stored in front of a liquid pressing mechanism 30 is discharged by means of the liquid pressing mechanism 30.

[0089] The liquid pressing mechanism 30 is configured so that the liquid cosmetic in the container (reservoir 11) is drawn out and supplied to the application part 23 by the relative rotation of a supply member 31, which is disposed in a rear end part of a shaft main body 10, in a circumferential direction relative to the shaft main body 10.

[0090] The liquid squeezing mechanism 30 of this applicator comprises: the feed member 31 which is rotatably fitted on the rear end of the shaft main body 10; a drive cylinder which transmits the rotational force of the feed member 31 applied by a user to a screw rod; a screw body which is fixed to the shaft main body 10 and screwed together with the screw rod; the screw rod with which a piston body 32 is rotatably engaged at a tip; and the piston body 32 which slides inside the reservoir 11 of the shaft main body 10.The liquid pressing mechanism 30 has a structure in which the rotation of the feeding member 31 is transmitted to the screw rod via the driving cylinder, and the resulting rotation of the screw rod causes the screw rod and the piston body 32 to move forward via a female screw of the nut-shaped screw body, whereby the liquid cosmetic is delivered from the reservoir 11 to the application part 23.

[0091] In the feed member 31, a cylindrical operating part, which is closed by inserting a crown into the rear end, is fitted so as to be rotatable at the rear end part of the shaft main body 10 and is exposed. The drive cylinder is inserted into the feed member 31 and fixed in the rotational direction, and in this drive cylinder, the screw body is mounted with a fixed rotational direction so as to be relatively movable in the axial direction. The crown is a spring member, and biases the feed member 31, which is a rotating body, toward the rear side.

[0092] In this applicator, a sealing part, a joining member 22, a front shaft 20, and the application part 23 are attached to the front end part of the shaft main body 10 by insertion. The liquid cosmetic is stored in the reservoir 11 of the shaft main body 10, and the liquid cosmetic drawn from the reservoir 11 passes through a flow path inside the joining member and is discharged to the application part 23, thereby enabling the application of the liquid cosmetic. Furthermore, the applicator is configured such that, after use, a cap 40 can be mounted on the front shaft 20 to cover the application part 23 and the front shaft 20.

[0093] In [Fig.l], the symbol 15 represents a stirring ball which stirs the liquid cosmetic in the reservoir 11 by a reciprocating motion, and the symbol 13 represents a sealing ball. An inner cap is disposed in the cap 40, and this inner cap is biased rearwardly by a rearward biasing spring. It is noted here that the stirring ball 15 can be omitted when the liquid cosmetic has good dispersibility as in the present invention.

[0094] Furthermore, symbol 14 represents a shutter in which an annular-shaped portion is mounted between the rear end of the front shaft 20 and the front face of a stepped portion of a front end portion 12 of the main shaft body 10 so as to dispose the sealing portion, the joining member 22, the front shaft 20, and the application portion 23 at a position where the flow path of the liquid cosmetic to the application portion 23 is closed when the applicator is not in use. In this shutter 14, the ring-shaped portion is partially cut out, and a button piece is integrally formed on the opposite side of the cut out portion. The ring-shaped portion can be detached from the rear end of the front shaft 20 and the front end portion 12 of the shaft main body 10 by pulling the button piece and thereby expanding the diameter of the ring-shaped portion from the cut out portion.

[0095] As illustrated in [Fig. 1], when the applicator is not in use, the sealing ball 13 is inserted into and hermetically seals an inner diameter portion of the sealing part which serves as a sealing ball receiver, preventing the liquid cosmetic from flowing to the side of the application part 23.On the other hand, when the applicator is used, the user pulls the shutter 14 out of the shaft main body 10 and pushes the front shaft 20 toward the rear end side, and this causes a rear end narrow portion of the joining member 22 to abut in the sealing ball 13, whereby the sealing ball 13 is removed from the inner diameter portion of the sealing part and moves into the reservoir 11, as a result of which the liquid cosmetic in the reservoir 11 flows from the inner diameter portion of the joining member 22 into the liquid flow path of the application part 23 and is delivered from inside the liquid flow path to the application part 23, thereby enabling the liquid cosmetic to be applied to a target part.

[0096] [Fig.2] illustrates a collector-type liquid cosmetic applicator of a direct-feed system in which the liquid cosmetic composition for eye makeup according to the present invention is stored.

[0097] In this liquid cosmetic applicator B, for example, as illustrated in [Fig. 2], the aqueous cosmetic composition 50 of the present invention fills a reservoir part 51 constituting a shaft body in which the aqueous cosmetic composition 50 is directly stored without being absorbed by an inner cotton or the like. The liquid cosmetic applicator B is configured such that a sheet body (ink retaining system, collecting member) 52, which temporarily retains the liquid cosmetic 50 pushed out of the reservoir part 51 in the case of expansion of air inside the reservoir part 51 due to an increase in temperature or the like so as to prevent the liquid cosmetic 50 from dripping from a pen tip or an air hole, is embedded in the front portion of the reservoir part 51, and a brush-type pen tip (a brush) 53 serving as an application body is disposed on the tip of the collecting member 52. As the brush-type pen tip (brush) 53, for example, a brush having an irregular cross-sectional shape other than a circular shape or a square shape may be cited.

[0098] The aqueous cosmetic composition 50 is delivered from the reservoir portion 51 to the pen tip 53 serving as the application portion via a relay core 55 in which there is an application liquid flow path 54 attached to a central hole of the collector member 52.

[0099] In [Fig. 2], each of the symbols 56 and 57 represents a holding member, the symbol 58 represents a rear shaft body fixed to the rear of the reservoir portion 51, and the symbol 59 represents a cap having an inner cap. The aqueous cosmetic composition may also be dispensed by disposing a rear portion of the pen tip 53 directly into the reservoir portion 51, without interposing the relay core 55 therebetween.

[0100] The liquid cosmetic applicator B having this shape is used by removing the cap 59 in the same manner as with the liquid cosmetic applicator A described above.

[0101] [Fig.3] illustrates a cotton-inner type liquid cosmetic applicator C in which the aqueous cosmetic composition for eye makeup according to the present invention is used.

[0102] The liquid cosmetic applicator C having this shape has, for example, as illustrated in [Fig. 3], a structure in which an inner shaft 61 is disposed inside an applicator main body 60; an impregnation body 62, which is formed of a porous material impregnated with the aqueous cosmetic composition of the present invention, is housed in the inner shaft 61; an application body 63, which is formed of a brush having an irregular cross-sectional shape for applying the liquid cosmetic, is disposed on the tip side of the impregnation body 62; and an end cap 64 is attached to the rear end of the inner shaft 61. The symbol 65 represents a cap having an inner cap portion 66. The liquid cosmetic applicator C having this shape is used by removing the cap 65.

[0103] Figure 4 illustrates a direct feed tapping type liquid cosmetic applicator D in which the aqueous cosmetic composition for eye makeup according to the present invention is used.

[0104] As illustrated in Figures 4(a) and (b), the liquid cosmetic applicator D is a container from which the liquid cosmetic in a reservoir 124 can be drawn off by pressing a ring gear 112, which is disposed in a rear end portion of a shaft main body 110, forward in the axial direction. So as to More specifically, the liquid cosmetic applicator D comprises: a tapping mechanism K which converts a pressing force of the crown 112, generated by a tapping operation of a user, into a rotational force; a screw body 128 which is fixed to the shaft main body 110; and a screw rod 130 which is screwed with the screw body 128. By rotating the screw rod 130 with the rotational force converted by the tapping mechanism K, the screw rod 130 is moved forward via the screw body 128, and the contents are consequently drawn out.

[0105] In the cosmetic applicator D described above, a junction 114, a pipe connector 116, a pipe 118, a front shaft 120, and a brush head 122 are attached to a front end portion 110a of the shaft main body 110, and the contents (aqueous cosmetic composition) drawn from the reservoir 124 in the shaft main body 110 pass through the pipe 118 and are discharged onto the brush head 122. Furthermore, the cosmetic applicator D is configured so that a cap 126 can be fitted thereon after use.

[0106] Note here that symbol 124a represents an agitator ball that agitates the contents in the reservoir 124 by a reciprocating motion; symbol 126a represents an inner cap; symbol 126b represents a spring for rearward biasing of the inner cap; and symbol 127 represents a shutter that blocks the flow of the contents downstream of the pipe 118 when the cosmetic applicator D is not in use. In a rear end portion of the pipe 118, when the cosmetic applicator D is not in use, a sealing ball 124b tightly adheres to an inner diameter portion of the junction 114 so that the contents do not flow into the pipe 118.On the other hand, when the cosmetic applicator D is in use, the sealing ball 124b is detached from the inner diameter portion of the junction 114 by extracting the shutter 127 from the shaft main body 110 and pushing the front shaft 120 toward the rear end side, as a result of which the contents flow into the pipe 118 and can be applied.

[0107] Examples

[0108] The present invention will now be described in more detail by way of examples and comparative examples; the present invention is however not limited by the examples described below and the like.

[0109] [Production Examples 1 to 13 and Comparative Production Examples 1 to 10: Pigment Dispersion Preparations for Aqueous Cosmetic Compositions]

[0110] In the same proportion as in the respective mixture formulations indicated in Tables 1 and 2 below, an aluminum lake such as Red No. 40, and a dispersant selected from poly(organic acids) and their salts and non-ionic surfactants, are dispersed in water and an organic solvent soluble in water, using a ball mill to prepare pigment dispersions for cosmetics. [YES] [Examples 1 to 13 (Table 1) and Comparative Examples 1 to 10 (Table 2): preparations of eyeliner compositions]

[0112] A film-forming agent and the like are further added to each of the pigment dispersions for aqueous cosmetic compositions obtained in Production Examples 1 to 13 and Comparative Production Examples 1 to 10, and each of the resulting products are mixed and stirred to obtain the respective mixture formulations shown in Tables 1 and 2 below, whereby eyeliner compositions are prepared.

[0113] The results of the evaluation of these eyeliner compositions are presented in Tables 1 and 2 below.

[0114] [Measurement of viscosity of eyeliner compositions]

[0115] For each of the eyeliner compositions of Examples 1 to 13 and Comparative Examples 1 to 10, obtained by the method described above, the viscosity at 25°C was measured using a plano-cone type viscometer (TVE-25, manufactured by Toki Sangyo Co., Ltd.) at a shear rate of 192 s1.

[0116] (Measurement of the particle size of eyeliner compositions)

[0117] For each of the pigment dispersions for aqueous cosmetic compositions obtained above, the average particle size at 25°C was measured using a particle size distribution analyzer [FPAR-1000 (manufactured by Otsuka Electronics Co., Ltd.)].

[0118] (Method for evaluating applicability)

[0119] Each of the eyeliner compositions obtained above was loaded into the applicator B described above (collector type eyeliner container) and applied to the skin of a tester, and the applicability was evaluated on the basis of the following evaluation criteria.

[0120] A: The cosmetic is discharged and applied without problem.

[0121] B: the cosmetic is discharged and applied to the skin; however the line drawn is partially cloudy.

[0122] C: The cosmetic is not normally discharged from the container, and cannot be applied to the skin.

[0123] (Color development after application)

[0124] In the same manner as in the applicability evaluation described above, each of the eyeliner compositions was loaded into applicator B and applied to the skin of 10 testers, and the color development was evaluated based on the following evaluation criteria.

[0125] A: All 10 testers feel that the color development is excellent.

[0126] B: at least 7 of 10 testers feel that the color development is good.

[0127] C: at least 3 of the 10 testers feel that the color development is good.

[0128] D: None of the testers feel that the color development is good.

[0129] (Adherence of the drawn line)

[0130] In the same manner as in the applicability evaluation described above, each of the eyeliner compositions was loaded into applicator B and applied to the skin of 10 testers. After a drawn line had dried, the applied surface was rubbed with the pad of a finger, and the adhesion was evaluated based on the following evaluation criteria.

[0131] A: The traced line does not show any change even after being rubbed 10 times with the fingertip of each tester who carried out the application.

[0132] B: As a result of rubbing the traced line 10 times with the pad of a finger of each tester who carried out the application, three of the 10 testers recognized a slight change in the traced line.

[0133] C: As a result of rubbing the traced line 10 times with the pad of a finger of each tester who carried out the application, 7 of the 10 testers recognized a change in the traced line.

[0134] D: As a result of rubbing the traced line 10 times with the pad of a finger of each tester who performed the application, all testers recognize a change in the traced line, or the line is erased.

[0135] (Water resistance)

[0136] In the same manner as in the applicability evaluation described above, each of the eyeliner compositions obtained above was loaded into the applicator B and applied to the skin. After a drawn line dried, the applied surface adhesion test described above was carried out under running water, and the water resistance was evaluated based on the following evaluation criteria.

[0137] A: The traced line does not show any change even after being rubbed 10 times with the fingertip of each tester who carried out the application.

[0138] B: As a result of rubbing the traced line 10 times with the pad of a finger of each tester who carried out the application, three of the 10 testers recognized a slight change in the traced line.

[0139] C: As a result of rubbing the traced line 10 times with the pad of a finger of each tester who carried out the application, 7 of the 10 testers recognized a change in the traced line.

[0140] D: As a result of rubbing the traced line 10 times with the pad of a finger of each tester who performed the application, all testers recognize a change in the traced line, or the line is erased.

[0141] (Make-up removal ability (non-staining property of the skin))

[0142] In the same manner as in the applicability evaluation described above, each of the eyeliner compositions obtained above was loaded into the applicator B and applied to the skin. After at least 8 hours, the makeup on the applied surface was removed using a makeup remover (BIORE (registered trademark) Wipe-Only Cotton Makeup Remover; manufactured by Kao Corporation), and the makeup removability (smearing property) was evaluated on the basis of the following evaluation criteria.

[0143] A: a drawn line is no longer recognizable after makeup removal.

[0144] B: a traced line remains even after makeup removal (a pigmentation). [Tables 1] Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Example 8 Example 9 Example 10 Example 11 Example 12 Example 13 Coloring Material Red Lake No. 40 9 9 15 28 28 9 9 9 15 8 5 Blue Lake No. 1 9 Yellow Lake No. 4 9 Red No. 40 Blue No. 1 Yellow No. 4 Emulsion Resin (Adhesive) Alkyl Acrylate Copolymer Emulsion 8.4 8.4 8.4 8.4 8.4 8.4 8.4 8.4 3 8.4 8.4 25.2 3 Poly(organic acid) (salt) Poly(sodium acrylate) 0.0 9 0.9 6 H, 2 14 6 0.0 9 0.0 9 0.8 1 Poly(sodium aspartate) 3.6 Non-ionic polymer Styrene / acrylate copolymer 3.6 Non-ionic surfactant Cetyl ether POE(2 0) 4.5 Cationic surfactant Stearamin ePPG-l / P EG-1 Preservative 4.0 6 4.0 6 4.0 6 4.0 6 4.0 6 4.0 6 4.2 4 4.0 6 4.0 6 4.0 6 4.0 6 4.1 8 4.0 6 Aqueous solvent (including purified water) The rest The rest The rest The rest The rest The rest The rest The rest The rest The rest The rest The rest The rest The rest Physical properties of the cosmetic Viscosity, mPa.s: 50 rpm (shear rate: 192 / s) 4.4 5.6 12.5 17.5 19.8 18.1 9.2 9 7.5 4.2 4.7 14.1 2.7 Granulometry 251 260 291 321 307 284 281 158 287 281 255 257 284 Assessment points Applicability AAAAAAAAAAAAA Colour development BBAAABBBABBBB Adhesion AAAAAAAABAAAB Water resistance ABBBBBABBAAAB Make-up removal (smearing property) AAAAAAAAAAAAA [Tables 2] Comparative Ex. 1 Comparative Ex. 2 Cor-para-tiv Ex. 3 Cor-para-tiv Ex. 4 Con-para-tiv Ex. 5 rCon-para-tiv Ex. rCon-para-tiv Ex. 7 Comparative Ex. 8 Comparative Ex. 9 Cor-para-tiv Ex. 10 Coloring Material Red Lake No. 40 9 35 9 15 9 9 5 Blue Lake No. 1 Yellow Lake No. 4 Red No. 40 1 Blue No. 1 1 Yellow No. 4 1 Emulsion Resin (Adhesive) Alkyl Acrylate Copolymer Emulsion 8.4 8.4 8.4 1.5 8.4 8.4 8.4 35 8.4 1 Poly(organic acid) (salt) Poly(sodium acrylate) 17.5 0.0 3 6 0.9 0.0 5 Poly(sodium aspar tate) Non-ionic polymer Styrene / acrylate copolymer Non-ionic surfactant Cetyl ether POE(20) Cationic surfactant Stear amine PPG-1 / P EG-1 0.9 Preservative 4.06 4.06 4.0 6 4.0 6 4.0 6 4.0 6 4.0 6 4.52 4.06 4.0 6 Solvent aqueous (including purified water) the remainder the remainder the remainder the remainder the remainder the remainder the remainder Physical properties of the cosmetic Viscosity, mPa.s: 50 rpm (shear rate: 192 / s) not measurable (gelling) 34.7 3.1 5.4 3.2 3 3.1 27.8 not measurable (gelling) 1.3 Particle size not measurable (gelling) 387 275 288 water-soluble colorant: no particle size 374 not measurable (gelling) 254 Assessment points Applicability CCAAAAACCA Color development not discharged; not assessed not discharged; not assessed CABBB not discharged; not assessed not discharged; not assessed B Adhesion not discharged; not assessed not discharged; not assessed CDBBB not discharged; not assessed not discharged; not assessed D Water resistance Not discharged; not evaluated Not discharged; not evaluated BCCCC Not discharged; not evaluated Not discharged; not evaluated D Ability to remove makeup Not de Not de AABBB Not de Not de A age e; e; e; e; (property d not ev not ev not ev not ev e smearing) aluated aluated aluated aluated

[0145] As evident from the results shown in Tables 1 and 2, the eyeliner compositions of Examples 1 to 13 exhibit good discharge characteristics and applicability when used in the collector type applicator B which is provided with a relay core and has a brush as an application part, and are confirmed to be superior to the eyeliner compositions of Comparative Examples 1 to 10 in all of color development, adhesion, water resistance, and removability.

[0146] Industrial applicability

[0147] The following can be obtained: a pigment dispersion for aqueous cosmetic compositions having excellent dispersibility of aluminum lakes which are pigments, such as Red No. 40; and an aqueous cosmetic composition using the same, which is suitable for eyeliner compositions and the like.

[0148] List of reference characters

[0149] 10, 60, 110: main shaft body

[0150] 11: tank

[0151] 12: front end portion of main shaft body

[0152] 13, 124b: sealing ball

[0153] 14, 127: shutter

[0154] 15, 124a: stirring ball

[0155] 20, 120: front shaft

[0156] 21: front shaft main body

[0157] 23, 53, 63, 122: brush (application part)

[0158] 24, 54, 116: core forming relay, pipe

[0159] 51: tank part

[0160] 52: collector element

[0161] 61: inner tree

[0162] 62: impregnation body (inner cotton)

[0163] K: tapping mechanism

Claims

Claims

1. A pigment dispersion for aqueous cosmetic compositions, the pigment dispersion comprising at least: an aluminum lake; at least one dispersant selected from poly(organic acids) and their salts, and non-ionic surfactants; and water and a water-soluble organic solvent.

2. A pigment dispersion for aqueous cosmetic compositions, wherein the content of the dispersant is 0.05 to 17.00% by mass relative to the total amount of the pigment dispersion for aqueous cosmetic compositions.

3. An aqueous cosmetic composition comprising at least: an aluminum lake in a proportion of 0.00025 to 30.00% by mass; 0.05 to 15.00% by mass of a dispersant selected from poly(organic acids) and their salts, and non-ionic surfactants; at least 2.50 to 30.00% by mass of a film-forming agent; and water and a water-soluble organic solvent.

4. An aqueous cosmetic composition according to claim 3, having a viscosity of 1.5 mPa.s to 20.0 mPa.s at 25°C and at a shear rate of 192 s '.

Images