阅读说明：本技术 化妆品用颜料分散液、使用其的水系液体化妆品 (Pigment dispersion for cosmetic, and aqueous liquid cosmetic using same ) 是由 高千代惠一郎 佐久间聪 于 2019-03-08 设计创作，主要内容包括：提供炭黑的分散性、经时稳定性优异的化妆品用颜料分散液、使用其的适合于染发剂等的水系液体化妆品。该化妆品用颜料分散液的特征在于,至少含有：水、水溶性有机溶剂、炭黑、及(甲基丙烯酰基乙基甜菜碱/丙烯酸(酯)类)共聚物,水相对于全部溶剂的比率为30～95质量％。(Provided are a pigment dispersion for cosmetics which is excellent in dispersibility of carbon black and stability over time, and an aqueous liquid cosmetic which uses the pigment dispersion and is suitable for hair dyes and the like. The pigment dispersion for cosmetic preparations is characterized by containing at least: water, a water-soluble organic solvent, carbon black, and a (methacryloylethylbetaine/acrylic acid (ester) -based) copolymer, wherein the ratio of water to the total solvent is 30 to 95% by mass.)

1. A pigment dispersion liquid for cosmetics, characterized by containing at least: water, a water-soluble organic solvent, carbon black, and a (methacryloylethylbetaine/acrylic acid (ester) -based) copolymer, wherein the ratio of water to the total solvent is 30 to 95% by mass.

2. The pigment dispersion liquid for cosmetics according to claim 1, wherein the water-soluble organic solvent is a lower alcohol having 5 or less carbon atoms.

3. The pigment dispersion liquid for cosmetics according to claim 2, wherein the lower alcohol is ethanol.

4. An aqueous liquid cosmetic comprising the pigment dispersion for cosmetics according to any one of claims 1 to 3.

5. The aqueous liquid cosmetic according to claim 4, wherein the ratio of water to the total solvent in the aqueous liquid cosmetic is 30 to 95% by mass.

6. The aqueous liquid cosmetic according to claim 5, wherein the aqueous liquid cosmetic contains a lower alcohol having 5 or less carbon atoms in addition to water.

7. The aqueous liquid cosmetic according to claim 6, wherein the lower alcohol is ethanol.

Technical Field

The present invention relates to a pigment dispersion for cosmetics having excellent dispersibility of carbon black and stability over time, and an aqueous liquid cosmetic using the same.

Background

Conventionally, since pigments have excellent hiding properties, color development, and the like, various materials containing pigments have been used as coloring materials for cosmetics such as temporary hair dyes, makeup cosmetics, and the like. In addition, as a resin added to cosmetics such as hair dyes, an amphoteric polymer resin is often used.

On the other hand, carbon black is a material used as a coloring material for aqueous makeup cosmetics and hair dyes. In the eye makeup cosmetics, carbon black is used for adding colors and shades to the surroundings of eyes such as eyelids, eyelashes and eyebrows to give an attractive impression. Among hair dyes, carbon black is used for dyeing hair such as white hair. This carbon black has a strong coloring power as a black pigment and can be suitably used for aqueous eye makeup cosmetics, hair dyes, and the like, but at present, the carbon black has a problem of a strong aggregating power and a reduced dispersibility and stability with time.

On the other hand, for example, the following 1) to 5) are known as prior art documents in which dispersibility, stability with time, and the like are mentioned in liquid cosmetics and the like containing a pigment such as carbon black and the like.

1) Patent document 1 describes the following problems: in some countries, carbon black is not used for cosmetics and the like because of suspected carcinogenicity and the like, and there is a problem that it is difficult to wipe off the carbon black during makeup removal although there is no problem in color development. This patent document 1 discloses a temporary hair dye comprising: an alcohol-based main solvent having 4 or less carbon atoms, an N-methacryloylethyl-N, N-dimethylammonium α -N-methylcarboxylbetaine-butyl methacrylate copolymer as a dispersant, and titanium black as a coloring component. Titanium black is described as an essential component in place of carbon black.

2) Despite the above-mentioned description of patent document 1, patent document 2 discloses a color hair cosmetic which contains water as a main solvent and contains: an acrylic amphoteric polymer resin having a specific structure, an acid dye, and carbon black. The acrylic amphoteric polymer resin other than the specific structure forms a firm resin coating on hair, and the problems of poor hair-washing property by shampoo and strong hardness are pointed out. In addition, when a dye and a pigment are used in combination, there is a disadvantage that the viscosity of the cosmetic tends to increase with time.

3) Further, patent document 3 by the present applicant discloses the following technique: carbon black was dispersed with water as the main solvent by the following copolymer: 1 copolymer selected from acrylic acid, methacrylic acid or their alkyl esters or derivatives with vinyl acetate; copolymers of vinyl pyrrolidone and vinyl acetate; copolymer of more than 1 selected from acrylic acid, methacrylic acid or their alkyl ester or derivatives and octyl acrylamide, and can be used for making eyeliner and eyebrow cosmetic. Patent document 3 describes: when the carbon black is dispersed using the betaine type alkyl acid amphoteric resin, the liquid stability is slightly poor.

4) Patent document 4 discloses a hair colorant composition containing water as a main solvent, a branched polyglycerol-modified silicone having a specific structure, a betaine-modified silicone, and a film-forming resin, and further containing an organic pigment. In addition, hair colorant formulations using (methacryloyloxyethyl carboxybetaine/alkyl methacrylate) copolymers in combination with carbon black with black # 401 (acid black 1, c.i.20470), violet # 401 (acid violet 43(c.i.60730), and orange # 205 (acid orange 7, c.i.15510) are exemplified.

5) Patent document 5 discloses a liquid cosmetic comprising cuttlefish melanin, an amphoteric compound, and water. Among them, examples in which water is the main solvent and yukaformmer ((methacryloyloxyethylcarboxybetaine/alkyl methacrylate) copolymer) is used for the dispersion of cuttlefish melanin are listed. However, no particular mention is made about the addition of inorganic pigments such as carbon black.

Disclosure of Invention

Problems to be solved by the invention

The present invention has been made to solve the above conventional problems, and an object thereof is to provide a pigment dispersion liquid for cosmetics which is excellent in dispersibility of carbon black and stability with time, and an aqueous liquid cosmetic suitable for hair dyes and the like using the same.

Means for solving the problems

The present inventors have conducted intensive studies to solve the above-mentioned conventional problems and found that a composition containing at least: the pigment dispersion for cosmetic products described above, and an aqueous liquid cosmetic suitable for hair dye or the like using the same can be obtained by using water, a water-soluble organic solvent, carbon black, and a specific component, and setting the ratio of water to the total solvent in a specific range, or the like.

That is, the pigment dispersion liquid for cosmetic preparations of the present invention is characterized by containing at least: water, a water-soluble organic solvent, carbon black, and a (methacryloylethylbetaine/acrylic acid (ester) -based) copolymer, wherein the ratio of water to the total solvent is 30 to 95% by mass.

The water-soluble organic solvent is preferably a lower alcohol having 5 or less carbon atoms.

The lower alcohol is preferably ethanol.

The aqueous liquid cosmetic of the present invention is characterized by containing the pigment dispersion for cosmetic preparations.

The ratio of water to the total solvent in the aqueous liquid cosmetic is preferably 30 to 95% by mass.

The aqueous liquid cosmetic preferably contains a lower alcohol having 5 or less carbon atoms in addition to water.

The lower alcohol of the aqueous liquid cosmetic is preferably ethanol.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the present invention, there can be provided: a pigment dispersion for cosmetics which is excellent in dispersibility and stability with time of carbon black, and an aqueous liquid cosmetic using the same which is suitable for hair dye and the like.

Detailed Description

The embodiments of the present invention will be described in detail below.

The pigment dispersion liquid for cosmetics according to the present invention is characterized by containing at least: water, a water-soluble organic solvent, carbon black, and a (methacryloylethylbetaine/acrylic acid (ester) -based) copolymer, wherein the ratio of water to the total solvent is 30 to 95% by mass.

The carbon black used in the present invention is not particularly limited as long as it is used as a coloring material for an eye makeup cosmetic or a hair dye, and various carbon blacks can be used as long as they are generally used as a coloring material for a black liquid cosmetic.

In general, an aqueous dispersion containing carbon black has problems such as a long time for dispersion due to its strong aggregating force and a reduction in productivity, stability with time, and the like in the production of the dispersion, but the above problems can be solved by preparing a dispersion having the blending characteristics of the present invention.

From the viewpoint of stability after dispersion and convenience in cosmetic production, the content of the carbon black to be used is desirably: the amount of the pigment dispersion liquid for cosmetics is preferably 1 to 32% by mass, and more preferably 2 to 25% by mass, based on the total amount of the pigment dispersion liquid for cosmetics.

When the content of the carbon black is 1% by mass or more, the productivity is excellent, and the coloring property when added to a cosmetic is excellent, while when the content is 32% by mass or less, the dispersibility and the stability with time are further improved.

The water-soluble organic solvent used in the present invention is used as a solvent for the cosmetic pigment dispersion, and examples thereof include lower alcohols having 5 or less carbon atoms. Specifically, there may be mentioned at least 1 kind (each alone or a mixture of 2 or more kinds) of methanol (methanol), ethanol (ethanol), n-propanol, isopropanol, n-butanol, sec-butanol, tert-butanol, isobutanol, pentanol, ethylene glycol, propylene glycol and the like.

In particular, ethanol (ethanol) is desirably used from the viewpoint of safety, handling properties, and the like.

From the viewpoint of the solubility stability of the (methacryloylethylbetaine/acrylic acid (ester) -based) copolymer described later, and further from the viewpoint of the stability of carbon black dispersion, particularly from the viewpoint of the stability at low temperature, the content of the water-soluble organic solvent used is desirably: the amount of the pigment dispersion liquid for cosmetics is preferably 1.0 to 60.0% by mass, and more preferably 5.0 to 30.0% by mass, based on the total amount of the pigment dispersion liquid for cosmetics.

By setting the content of the water-soluble organic solvent to 1.0 mass% or more, the freezing prevention effect at low temperature of the solvent can be exhibited, and the anticorrosive effect can be exhibited although the effect is weak, while by setting the content to 60.0 mass% or less, the later-described solubility stability of the (methacryloylethylbetaine/acrylic acid (ester) -based) copolymer is further improved.

The (methacryloylethylbetaine/acrylic acid (ester) -based copolymer used in the present invention is a component that improves the dispersibility of carbon black and the stability with time when the dispersion is prepared.

The (methacryloylethylbetaine/acrylic acid (ester) -based copolymer is a copolymer of 2 or more monomers consisting of acrylic acid, methacrylic acid or their simple esters and ethylbetaine methacrylate, and has a common name of N-methacryloyloxyethyl-N, N-dimethylammonium- α -N-methylcarboxylbetaine/alkyl methacrylate copolymer, and has a betaine unit in a polymer structure, and a polymer having the betaine unit exhibits unique characteristics unlike other ionic polymers.

Conventionally, a (methacryloylethylbetaine/acrylic acid (ester) -based copolymer has been used as a film-forming agent or a hair styling agent, and in the case of the present invention, it is a component that exhibits a novel use as a component for improving the dispersibility of carbon black and the stability with time when a dispersion is prepared.

As the (methacryloylethylbetaine/acrylic acid (ester) -based) copolymer which can be used, commercially available ones such as RAMESIN-1000 (available from Osaka Chemicals Co., Ltd.), Plus size L-440 (available from Kyowa Kagaku K.K.) and the like can be used.

From the viewpoint of improving the dispersibility of carbon black and the stability with time when the carbon black is prepared into a dispersion, the content of the (methacryloylethylbetaine/acrylic acid (ester) -based) copolymer to be used is desirably: the amount of the pigment dispersion is preferably 3.0 to 15.0% by mass, and more preferably 5.0 to 10.0% by mass in terms of solid content, based on the total amount of the pigment dispersion for cosmetics.

By setting the content of the (methacryloylethylbetaine/acrylic acid (ester) -based) copolymer to 3.0 mass% or more, the dispersion state of carbon black becomes stable, and the fixation of a pigment or the like when blended in a cosmetic becomes good, while by setting the content to 15.0 mass% or less, the increase in viscosity is suppressed, and the convenience of manufacturing a cosmetic becomes further good.

In the present invention, the compounding ratio of the above carbon black to the (methacryloylethylbetaine/acrylic acid (ester) -based) copolymer to be used is desirably: further preferably, the carbon black is: (methacryloylethylbetaine/acrylic acid (ester) copolymer ═ 1: 1-4: 1. particularly preferably, the ratio is 2: 1-4: 1.

By setting this ratio to 1: 1-4: 1, thereby providing a pigment dispersion liquid for cosmetics which can achieve both high dispersibility of carbon black and high stability over time.

As the water to be used as the solvent in the present invention, distilled water, ion-exchanged water, purified water, pure water, ultrapure water, or the like can be used, and the ratio of water to the total solvent (water + water-soluble organic solvent) is required to be 30 to 95 mass% (0.30 to 0.95), preferably 60 to 95 mass%.

When the ratio of the water to the total solvent is less than 30% by mass (0.30), the stability with time becomes unstable and the carbon black cannot be dispersed. On the other hand, if it exceeds 95 mass% (0.95), the production cannot be carried out due to the solvent other than water originally contained in each component.

The pigment dispersion liquid for cosmetics of the present invention contains: the water-soluble organic solvent, carbon black, (methacryloylethylbetaine/acrylic acid (ester) -based copolymer, and water may be used as needed, and a pH adjuster, a surfactant, a viscosity adjuster, a chelating agent, and the like may be used as necessary, from the viewpoint of further improving dispersibility and the storage stability of each component.

The pigment dispersion liquid for cosmetics according to the present invention can be prepared by mixing and uniformly stirring/mixing the above-mentioned components such as the water-soluble organic solvent, carbon black, the (methacryloylethylbetaine/acrylic acid (ester) -based) copolymer, and water in the above-mentioned content ranges.

For example, a pigment dispersion for cosmetics can be produced by: the pigment dispersion liquid for cosmetics can be produced by stirring carbon black, a water-soluble solvent, water and other solvents uniformly with a general-purpose disperser or the like, mixing the (methacryloylethylbetaine/acrylic acid (ester) -based) copolymer, further stirring the mixture uniformly with a homomixer or the like, and stirring the mixture with a disperser or the like.

The pigment dispersion liquid for cosmetics of the present invention thus constituted can solve the problems of long dispersion time and low stability with time of a dispersion liquid in carbon black as a black pigment, and can obtain a pigment dispersion liquid for cosmetics excellent in dispersibility of carbon black and excellent stability with time.

The obtained pigment dispersion for cosmetics can be suitably used for applications of cosmetics using carbon black, and preferable applications include eye makeup cosmetics, hair cosmetics, nail cosmetics, and the like, and examples thereof include eye makeup cosmetics such as eye shadow pencils, eyeliners, eyebrow pencils, mascaras, lotion, hair conditioner, hair dye, hair restorer, nail oil, nail care solution, various gel nails, and the like. The form of the product is not particularly limited, and the product is a dispersion (aqueous system), and therefore the product can be applied to aqueous cosmetics such as a liquid, an emulsion, a cream, a paste, a gel, a mousse, and a spray.

In particular, from the viewpoint of the dispersion characteristics of the pigment dispersion liquid for cosmetics of the present invention, it is preferably applied to hair dyes, eye makeup cosmetics (including eyeliners, mascaras, and eyeshadows), aqueous nail varnishes, and the like, which are aqueous liquid cosmetics.

As a specific embodiment of the aqueous liquid cosmetic of the present invention, an application to a hair dye will be described below.

Examples of hair dyes that can be used include at least: a pigment dispersion for cosmetics, a general-purpose hair dye component, for example, a resin, a lower alcohol, a hair dye auxiliary, a pH adjuster, and water, which contain the carbon black, and further, a colorant other than the carbon black may be contained as needed depending on the color change of the hair dye.

From the viewpoint of hair dyeing effect, solubility, storage stability and the like, the content of the pigment dispersion for cosmetics containing the carbon black is desirably: the amount of the hair dye is preferably 0.5 to 30.0% by mass, and more preferably 1.0 to 25.0% by mass, based on the total amount of the hair dye.

As the colorant other than carbon black that can be used, pigments used in hair dyes are generally used, and examples of inorganic pigments include black titanium oxide, yellow iron oxide, black iron oxide, Indian red, ultramarine, Prussian blue, chromium oxide, chromium hydroxide, carmine, shikonin, etc., and examples of organic pigments include Red No. 2 (acid Red 27: C.I.16185), Red No. 3 (acid Red 51: C.I.45430), Red No. 102 (acid Red 18: C.I.16255), Red No. 104 (acid Red 92: C.I.45410), Red No. 105 (acid Red 94: C.I.45440), Red No. 106 (acid Red 52: C.I.45100), Red No. 227 (acid Red 33: C.I.17200), Red No. 230 (1), Red No. 230 (2) (all of acid Red 87: C.I.45380), Red No. 231.I.45380, Red No. 92: C.4594: C.45410), Red No. 440: C.I.45410, Red No. 440: C.45380, Red No. 6.440: C.45410, Red No. 2, Yellow No. 4 (acid yellow 23: c.i.19140), yellow No. 5 (food yellow 3: c.i.15985), yellow No. 202 (1), yellow No. 202 (2) (all acid yellow 73: c.i.45350), yellow No. 203 (acid yellow 3: c.i.47005), green No. 3 (food green: c.i.42053), green No. 201 (acid green 25: c.i.61570), green No. 204 (solvent green 7: c.i.59040), green No. 205 (acid green 5: c.i.42095), blue No. 1 (food blue 2: c.i.42090), blue No. 2 (acid blue 74: c.i.73015), blue No. 202 (acid blue 5: c.i.42052), blue No. 205 (acid blue 9: c.i.42090), orange No. 205 (acid orange 7: c.i.15510), red No. 207 (acid red 95: c.i.45425), brown No. 24: c.i.20157 (acid blue 201: c.i.20170), and the like, and a chelate red pigment of acid orange 7: c.i.i.15510, a water-soluble aluminum pigment (acid red orange 201: 1: c.1: c.i.202, yellow No. 1: yellow pigment, yellow No. 1: c.201: yellow pigment, yellow No. 1: c.1: yellow pigment, Red 203 (pigment Red 53: C.I.15585), Red 204 (pigment Red 53 (Ba): C.I.15585), Red 205 (pigment Red 49 (Na): C.I.15630), Red 206 (pigment Red 49 (Ca): C.I.15630), Red 207 (pigment Red 49 (Ba): C.I.15630), Red 208 (pigment Red 49 (Sr): C.I.15630), Red 215 (solvent Red 49: C.I.45170), Red 218 (solvent Red 48: C.I.45410), Red 219 (pigment Red 64: C.I.15800), Red 220 (pigment Red 63 (Ca): C.I.15880), Red 221 (pigment Red 3: C.I.12120), Red 223 (solvent Red 43: C.I.45380), Red 225 (solvent Red 23: C.I.26100), Red 226: C.I.611.12120), yellow wine No. yellow 205: yellow 205.51: yellow 205: yellow 201.51: yellow 201: yellow 205.51: yellow 201: yellow 205: C.31: yellow 205: yellow 201: yellow 205: C.735: yellow 205: yellow 201: yellow 31: yellow 14: C.31: yellow 14 Blue 204 (vat blue 6: c.i.69839), blue 404 (pigment blue 15: c.i.74160), orange 201 (solvent red 72: c.i.45370), orange 203 (pigment orange 5: c.i.12075), orange 204 (pigment orange 13: c.i.21110), orange 206 (solvent red 73: c.i.45425), orange 401 (pigment orange 1: c.i.11725), orange 402 (acid orange 20: c.i.14600), orange 403 (solvent orange 2: c.i.12100), black 401 (acid black 1: c.i.20470), violet 201 (solvent violet 13: c.i.60725) and the like, and at least 1 of these can be used.

The content of these colorants when used is desirably 1.0 to 25.0% by mass based on the total amount of the hair dye, from the viewpoints of hair dye effect, solubility, storage stability and the like.

Examples of the resin that can be used include a resin having water resistance and a resin having film-forming properties, and examples thereof include at least 1 of (methacryloyloxyethylcarboxybetaine/alkyl methacrylate) copolymer, (octylacrylamide/hydroxypropyl acrylate/butylaminoethyl methacrylate) copolymer, (hydroxyethyl acrylate/butyl acrylate/methoxyethyl acrylate) copolymer, N-methacryloylethyl-N, N-dimethylammonium α -N-methylcarboxylbetaine/butyl methacrylate copolymer, and (methacryloylethylbetaine/acrylic acid (ester) -based) copolymer.

From the viewpoints of water resistance, hand after hair coating, coatability, and the like, the contents of these resins are desirably: 0.1 to 10.0%, preferably 0.5 to 5.0%, in terms of solid content, based on the total amount of the hair dye.

The lower alcohol which can be used is suitably used in view of low-temperature stability, drying property, low irritation, and the like. Examples of the lower alcohol to be used include lower alcohols having 5 or less carbon atoms. Specifically, at least 1 kind (each alone or a mixture of 2 or more kinds) of methanol (methanol), ethanol (ethanol), n-propanol, isopropanol, n-butanol, sec-butanol, tert-butanol, isobutanol, pentanol, and the like can be mentioned.

In particular, ethanol (ethanol) is desirably used from the viewpoint of safety, handling properties, and the like.

The content of these lower alcohols is preferably 10 to 80% by mass, more preferably 15 to 70% by mass, and particularly preferably 15 to 65% by mass based on the total amount of the hair dye.

The hair dyeing auxiliary that can be used is one that is used from the viewpoint of further improving the hair dyeing effect, and examples thereof include at least 1 of benzyl alcohol, phenyl ethanol, phenoxyethanol, propylene carbonate, propylene glycol, ethoxydiglycol, N-methylpyrrolidone, N-methyl-2-pyrrolidone, and the like.

From the viewpoint of further hair dyeing effect, the content of these hair dyeing auxiliaries is preferably 2.0 to 20.0%, more preferably 5.0 to 15.0%, and particularly preferably 3.0 to 5.0% with respect to the total amount of the hair dye.

pH adjusters that can be used are for improving colorability, preventing skin irritation, preventing skin staining accidents, and it is desirable that: the pH of the hair dye is preferably adjusted to 2 to 5, more preferably 3.5 to 5.0 by the pH adjuster.

Examples of the pH adjuster that can be used include organic acids such as formic acid, acetic acid, lactic acid, tartaric acid, malic acid, citric acid, and glycolic acid, inorganic acids or salts thereof, and optionally bases such as triethanolamine.

The balance of the hair dye can be adjusted by using water (purified water, distilled water, ion-exchanged water, pure water, tap water, etc.).

As the content of the water, it is desirable that: the ratio of water to the total solvent (water + water-soluble organic solvent) is preferably 30 to 95 mass% (0.30 to 0.95), more preferably 30 to 80 mass%.

When the ratio of the water to the total solvent is less than 30 mass% (0.30), the stability with time is deteriorated, and when a water-soluble component is added, the dissolution stability is deteriorated, while when it exceeds 95 mass% (0.95), the possibility of the antibacterial property being poor is increased.

The hair dye thus constituted contains at least: the cosmetic pigment dispersion liquid containing the carbon black, the resin, the lower alcohol, the hair dyeing auxiliary agent, and the pH adjuster may contain other materials, for example, a thickener, various surfactants, a preservative, an ultraviolet absorber, an antioxidant, an anti-reducing agent, a chelating agent, an oily component, a perfume, an animal or plant extract, and the like, as appropriate, within a range not impairing the effects of the present invention.

Examples of the thickener that can be used in terms of coatability, storage stability, suppression of sedimentation of the pigment, and the like include cellulose-based thickeners such as hydroxyethyl cellulose, hydroxypropyl methylcellulose, stearyloxyhydroxypropyl methylcellulose, hydroxypropyl guar hydroxypropyl ammonium trichloride, cationized cellulose obtained by adding a cationic functional group to cellulose, resin-based thickeners such as polyvinyl alcohol and acrylic acid, and clay-based thickeners such as bentonite.

The viscosity of the hair dye is preferably 1.0 to 200 mPas at 25 ℃ (cone and plate viscometer: 50rpm) for a container using a cotton wool (sliver) from the viewpoints of appropriate viscosity, dye dissolution stability, smoothness, flexibility, and wet feeling imparted to the hair to improve touch, water resistance, usability and coatability when applied to an article, and hair use.

Similarly, when the viscosity at 25 ℃ is used for a container using a valve, it is desirable that the viscosity (cone and plate viscometer: 50rpm) be 1.0 to 100 mPas.

Further, when used in a mascara-shaped container, the viscosity at 25 ℃ (cone-plate viscometer: 50rpm) is preferably 10 to 200 mPas, more preferably 1.0 to 50 mPas, and still more preferably 1.0 to 10.0 mPas.

The viscosity range (1.0 to 200 mPas) can be adjusted by appropriately adjusting the amounts of the respective components to be used, the thickener to be preferably used, the amounts thereof, and the like.

By setting the viscosity of the hair dye to 1.0mPa · s or more, it becomes difficult for the hair dye to leak from a container or the like, to adhere to the scalp, and to soil clothes, and by setting the viscosity to 200mPa · s or less, it becomes easier for the user to control the amount of liquid wound around an application body such as a brush, and the hair dye can be applied to the hair thinly and uniformly.

The hair dye of the present embodiment can be produced by a conventional method, and can be produced in the above-described preferred viscosity range and pH range by mixing the above-described components including the pigment dispersion for cosmetics, resin, lower alcohol, hair dyeing auxiliary, pH adjuster, and water, and further uniformly stirring and mixing the above components using a suitable mixer or the like.

The target hair dye can be prepared, for example, by: the target hair dye can be produced by stirring an alcohol phase such as a resin or a lower alcohol, and an aqueous phase such as a colorant containing carbon black and water, respectively, with a general disperser or the like until uniform, mixing the alcohol phase and the aqueous phase, adding a pH adjuster, a thickener, and the like, stirring with a disperser or the like until uniform, and then stirring with a homomixer or the like.

When the hair dye of the present embodiment thus constituted is used, a general-purpose hair application tool can be used, and the shape, structure, and the like of the hair application tool used are not particularly limited, and examples thereof include an application tool provided with a rotary valve device, a mascara-type application tool, a tube-type application tool, and an application tool provided with a piston pressing mechanism.

The hair dye of the present embodiment thus constituted contains at least: the cosmetic pigment dispersion liquid containing the carbon black, the resin, the lower alcohol, the hair dyeing auxiliary agent, the pH regulator and the water have excellent dispersibility and stability with time of the carbon black as a black pigment, so that the coloring component of the hair dye can be stably dispersed, and the hair dye with excellent storage stability, water resistance, usability, coating property, low-temperature stability, drying property, low irritation and the like can be obtained.