JP2002363031A - Pigment dispersion for cosmetic, cosmetic composition and method for producing the composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a pigment dispersion for cosmetic, in which the dispersion state of a pigment is fine and stable and which has excellent color development and luster. SOLUTION: The pigment dispersion is characterized in that the dispersion diameter of at least >=90% pigment particles is distributed in <=0.7 μm.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a pigment dispersion for cosmetics, a cosmetic composition and a method for producing the same.

[0002]

2. Description of the Related Art Pigments used in make-up cosmetics, for example, eyeliners, eyebrows, mascaras, lipsticks, nail manicures, etc., are blended with other components in the form of powder or in the form of dissolving chips, and are used in ball mills and sand mills. ,
It was mixed using a known disperser such as a roll mill, a homomixer, and an attritor. It has also been proposed to use a pigment dispersion in which a pigment is dispersed in a dispersion medium such as an aqueous medium.

For example, Japanese Patent Publication No. 2604190 discloses a dispersion in which iron oxide particles having a specific particle size are dispersed together with a polymer dispersant and water in a ball mill or a dyno mill.
By blending other ingredients to make a liquid cosmetic,
It is described that when penetrating into a built-in type applicator, it penetrates well into an application part and can prevent clogging over time.
In Japanese Patent Application Laid-Open No. 11-189,513, an aqueous dispersion is prepared by mixing an inorganic color pigment such as iron oxide surface-treated with alumina with water together with a surfactant and an antifoaming agent. By mixing with, a water-based makeup cosmetic is obtained by improving the color separation, the feeling of use and the durability of the makeup. It is also known to wet crush cosmetic pigments.
No. 6 describes that an aqueous polymer emulsion is used as a dispersant to wet-pulverize a pigment to obtain an aqueous nail polish.

[0004]

However, in any of the above-mentioned methods, the dispersion does not proceed smoothly or falls into an overdispersed state, so that the distribution width of the particles is wide, and a large number of coarse particles also remain. It was found that satisfactory gloss, gloss and stability over time could not be obtained. Simply in advance in the state of a dispersion liquid in which the pigment is dispersed in various dispersion media in advance,
Just by blending this with other ingredients to prepare cosmetics,
Aggregation of the pigment particles occurs and the dispersion is insufficient. In particular, it has been extremely difficult to obtain a stable finely dispersed pigment dispersion in an aqueous medium. Also, it is known to wet-pulverize pigments in an aqueous medium.
Again, the dispersion did not go smoothly or became overdispersed, the distribution width of the particles was wide, and a large number of coarse particles also remained,
The problem of not being able to obtain satisfactory color development, gloss, and stability over time has not been solved.

[0005]

The inventors of the present invention have conducted intensive studies to develop an organic pigment dispersion for water-based cosmetics having excellent coloring properties, gloss, and stability over time in the state of dispersion. It has been found that a pigment dispersion having a specific particle size distribution is an organic pigment dispersion for water-based cosmetics that exhibits excellent coloration and gloss and has good stability over time, and has completed the present invention. .

That is, the present invention provides (1) at least 9
A pigment dispersion liquid for cosmetics, characterized in that a dispersion diameter of 0% or more of pigment particles is distributed to 0.7 μm or less, (2) The above-mentioned (1), which contains at least a pigment, a dispersion medium and a dispersant. The pigment dispersion for cosmetics according to (1) or (2), wherein (3) the pigment dispersion for cosmetics according to (1) or (2), wherein the dispersion medium is an aqueous medium. (5) A method for producing a cosmetic composition, which comprises blending the pigment dispersion for cosmetics according to any one of (1) to (4) above.
(3) A method for producing a cosmetic composition, which comprises mixing the cosmetic pigment dispersion according to any one of (3) with a polymer emulsion and a thickener, (6) a dispersion diameter of at least 90% or more of pigment particles. Is distributed to 0.7 μm or less.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.
The pigment used in the present invention is not particularly limited as long as it is used for cosmetics, and either an inorganic pigment or an organic pigment can be used. Preferably, an organic pigment or carbon black is used. For example, Red No. 3, Red 10
No. 4, Red No. 106, Yellow No. 4, Yellow No. 5, Green No. 3,
Blue No.1, Red No.227, Red No.230, Red 401
Aluminum, zirconium, barium lake, red 2 such as No. 205, orange 205, yellow 202 and yellow 203
No. 01 calcium, barium lake, red No. 202,
Red No. 204, Red No. 205, Red No. 220, Red No. 22
No. 6, Red No. 228, Red No. 404, Red No. 405, Orange No. 203, Orange No. 204, Yellow No. 205, Yellow 401
No. 204, Blue No. 404, and carbon black.

Particularly preferred are Red 201 and Red 20
No. 2, Red No. 220, Red No. 226, Orange No. 204, Yellow No. 205, Yellow No. 401, Blue No. 204, Blue No. 404
No., and carbon black. In particular, when these pigments are used, the effect of exhibiting performance such as color developability is remarkable when the particle size is within the range specified in the present invention. The mixing ratio of the pigment is preferably from 1 to 40% by weight, more preferably from 10 to 30% by weight, based on the solid content of the dispersion. In this range, the handleability is particularly good, and it is also suitable for producing a cosmetic composition.

Although the dispersion medium used in the pigment dispersion of the present invention is not limited, an aqueous dispersion containing water in particular as the dispersion medium is suitable for use as a coloring material for aqueous cosmetics. Here, the aqueous dispersion refers to one containing 50% by weight or more of water as usually used. Since the pigment dispersion of the present invention has very excellent dispersion stability, it may further contain water in an amount of 60% by weight or more, and more preferably 70% by weight or more. A dispersion containing no organic solvent can also be used. The pigment dispersion of the present invention can further improve the dispersion stability by containing a dispersant. Although the dispersant used here is not limited, for example, a water-soluble polymer and various surfactants are typical. Examples of the water-soluble polymer include styrene-acrylic acid copolymer, styrene-methacrylic acid copolymer, styrene-α-methylstyrene-acrylic acid copolymer, alkyl acrylate copolymer, acrylate-methacrylic acid copolymer. Polymers, styrene-maleic acid copolymers, methoxyethylene-maleic anhydride copolymers and half esters thereof, and the like, and as salts thereof, alkali salts such as sodium, potassium, and lithium; ammonium salts; And alkanolamine salts such as triethanolamine and triisopropanolamine. Other examples include polyvinylpyrrolidone vinyl acetate copolymer and polyvinylpyrrolidone.

Examples of the anionic surfactant include soap base, zinc laurate, zinc myristate, magnesium myristate, zinc palmitate, magnesium stearate, zinc stearate, aluminum stearate, calcium stearate, sodium lauryl sulfate, Triethanolamine lauryl sulfate, sodium cetyl sulfate, polyoxyethylene lauryl ether triethanolamine sulfate, polyoxyethylene lauryl ether sodium sulfate, polyoxyethylene lauryl ether phosphoric acid, sodium polyoxyethylene lauryl ether phosphate, polyoxyethylene cetyl ether Phosphoric acid, sodium polyoxyethylene cetyl ether phosphate, polyoxyethylene stearyl ether phosphoric acid, polyoxyethylene Rail ether phosphoric acid, sodium polyoxyethylene oleyl ether phosphate, polyoxyethylene alkyl (12-16) ether phosphoric acid, polyoxyethylene alkyl phenyl ether phosphoric acid, polyoxyethylene alkyl phenyl ether phosphate triethanolamine, polyoxy Sodium ethylene alkyl phenyl ether phosphate, sodium dioctyl sulfosuccinate, and the like.

Examples of the nonionic surfactant include glyceride monostearate, glyceryl monooleate, ethylene glycol monostearate, propylene glycol monostearate, propylene glycol dioleate, sorbitan monolaurate, sorbitan monopalmitate, and monostearin Sorbitan acid, sorbitan monooleate, sorbitan sesquioleate,
Sorbitan trioleate, sucrose fatty acid ester, polyoxyethylene lauryl ether, polyoxyethylene cetyl ether, polyoxyethylene stearyl ether, polyoxyethylene octyl phenyl ether,
Polyoxyethylene nonylphenyl ether, polyoxyethylene octyl dodecyl ether, polyoxyethylene isocetyl ether, polyoxyethylene isostearyl ether, polyoxyethylene oleyl cetyl ether, polyoxyethylene stearamide, monostearate polyoxyethylene glycerin, Polyoxyethylene sorbit monolaurate, polyoxyethylene sorbit monooleate, polyoxyethylene sorbitan trioleate, polyoxyethylene sorbit tetraoleate, polyoxyethylene castor oil, polyoxyethylene hardened castor oil, polyoxyethylene lanolin, etc. No.

Among these dispersants, particularly, styrene-acrylic acid copolymers, sodium salts and ammonium salts of styrene-α-methylstyrene-acrylic acid copolymers, and polyoxyethylene lauryl ether phosphoric acid, polyoxyethylene Sodium ethylene lauryl ether phosphate, polyoxyethylene cetyl ether phosphate, polyoxyethylene cetyl ether sodium phosphate, polyoxyethylene stearyl ether phosphate, polyoxyethylene oleyl ether phosphate, polyoxyethylene oleyl ether sodium phosphate, poly Phosphate anionic surfactants such as oxyethylene alkyl (12-16) ether phosphoric acid, polyoxyethylene alkyl phenyl ether phosphoric acid, polyoxyethylene lauryl ether, polyoxy Tylene cetyl ether, polyoxyethylene stearyl ether, polyoxyethylene octyl phenyl ether, polyoxyethylene nonyl phenyl ether, polyoxyethylene octyl dodecyl ether, polyoxyethylene isocetyl ether, polyoxyethylene isostearyl ether, polyoxyethylene oleyl cetyl Polyoxyethylene nonionic surfactants such as ethers are preferred.

The above-mentioned dispersants can be used alone or in combination of two or more. Preferably, 0.1 to 40 parts by weight, particularly preferably 10 to 35 parts by weight, per 100 parts by weight of the pigment to be compounded. Then, the dispersibility and dispersion stability of the pigment can be particularly enhanced. In addition, various water-soluble solvents can be contained, for example, polyethylene glycol, glycerin, propylene glycol, ethylene glycol, isoprene glycol, and 1.3 butylene glycol.

In addition, it may contain a humectant, a preservative and a pH adjuster. As the humectant, for example, ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, dipropylene glycol,
Polypropylene glycol, 1.3 butylene glycol, isoprene glycol, polyethylene glycol,
Hexylene glycol, glycerin, concentrated glycerin, diglycerin, polyglycerin, sorbitol, sorbitol solution, maltitol, maltitol solution, xylit.

As preservatives, for example, chlorobutanol, chlorcresol, parachloromethaxylenol,
Cresol, triclosan, trichlorocarbanide, isopropylmethylphenol, benzethonium chloride, benzethonium chloride solution, cetylpyridinium chloride, thianthol, phenol, sodium paraphenolsulfonate (dihydrate), zinc paraphenolsulfonate, resorcinol, photosensitizer 101 No., Photoelement 201, Photoelement 3
01, photosensitive element 401, hinokiol, 1-menthol, dl-menthol, d-camphor, dl-camphor, benzoic acid, sodium benzoate, paraoxybenzoates, sorbic acid, potassium sorbate, dehydroacetic acid, Examples include sodium dehydroacetate, salicylic acid, sodium salicylate, methyl salicylate, phenyl salicylate, and the like.

[0016] Examples of the pH adjuster include ethanolamine, diethanolamine, triethanolamine and isopropanolamine. Diisopropanolamine, triisopropanolamine, 2-amino-2-methyl-1-propanol, 2-amino-2-methyl-1.3-propanediol, morpholine, sodium hydroxide, magnesium hydroxide, potassium hydroxide, strong Ammonia water.

The cosmetic pigment dispersion of the present invention contains, in addition to the above components, components generally used in water-based cosmetic items, such as thickeners and chelating agents, so long as the effects of the present invention are not impaired. And an antifoaming agent can be appropriately compounded. However, since the pigment dispersion of the present invention is very excellent in dispersion stability, a low-viscosity dispersion in which components such as a thickener are not added can be used.

The method for preparing the pigment dispersion of the present invention is not limited. For example, the above components are blended and wet-pulverized using a known dispersing machine such as a ball mill, sand mill, roll mill, homomixer, and attritor. . At this time, in order to make at least 90% or more of the pigment particles 0.7 μm or less, wet pulverization is performed as appropriate while checking the particle size, and wet pulverization is performed until at least 90% or more of the pigment particles become 0.7 μm or less. Just do it. In that case, the desired particle size distribution can be obtained by selecting the amount of the dispersant for each pigment type and appropriately adjusting the number of revolutions and the dispersion share of the disperser at the time of pulverization.

The particle size can be confirmed by, for example, "Microtrack UPA MODEL: 9340-UPA" (manufactured by Nikkiso Co., Ltd.). The pigment dispersion of the present invention thus obtained can be used at room temperature and 50 ° C.
Average dispersion diameter of pigment particles at ° C., pH, viscosity, particle size distribution of pigment particles, hue, any of the presence or absence of sediment,
Excellent stability over 3 months can be obtained.

In this way, a pigment dispersion of the present invention characterized in that at least 90% or more of the pigment particles have a dispersion diameter of 0.7 μm or less. Here, the dispersion diameter of the pigment particles refers to the dispersion diameter of the pigment particles existing in the liquid, and is measured by the following method. That is,
Using "Microtrack UPA" (manufactured by Nikkiso Co., Ltd.), the signal level is 0.1 to 100, preferably 0.6 to 100.
It is measured using a diluent obtained by diluting a sample with ion-exchanged water so as to obtain a value of 80. When the dispersion diameter of at least 90% or more of the pigment particles is 0.7 μm or less, the particle size distribution of the pigment in the liquid is measured by the above-described apparatus and method, and the cumulative curve in the obtained particle size distribution is 90%. The particle size at the point, the value usually called “90% diameter” is 0.7 μ
m or less. When the pigment particles having a particle size of 0.7 μm or less are less than 90%, the color development and gloss are lost due to the coarse particles, and the sedimentation of the pigment occurs over time,
As a result, a dispersion liquid having good stability over time cannot be obtained. The pigment dispersion of the present invention further has a 90% diameter of 0.5 μm or less,
μm or less.

The average dispersion diameter of the pigment in the pigment dispersion of the present invention is not particularly limited, but is preferably 0.5 μm or less, more preferably 0.3 μm or less. By setting the content in this range, it is possible to obtain a pigment dispersion which can provide an aqueous cosmetic composition having particularly excellent dispersion stability and color development. Although the viscosity of the pigment dispersion of the present invention is not particularly limited, the viscosity of the pigment dispersion of the present invention can be extremely low, for example, 5 cps or less, further 2 cps or less, further 1 cc.
Since it can be less than ps, it is easy to handle and mix with other cosmetic ingredients. In order to obtain a higher viscosity, the viscosity may be adjusted by appropriately adding a component such as a thickener.

The above-described pigment dispersion of the present invention can be blended as a coloring material to produce a cosmetic composition. For example, a water-based cosmetic composition such as an eyeliner, eyebrow, mascara, lipstick, or nail manicure can be obtained by blending the pigment dispersion of the present invention with a polymer emulsion and a thickener. Typical polymer emulsions include various water-soluble polymer emulsions such as acrylic resin, styrene / acrylic acid resin, vinyl acetate resin, styrene / butadiene resin, polyurethane, olefin resin, and alkyd resin. . Methylcellulose, carboxymethylcellulose as a thickener,
Hydroxyethyl cellulose, hydroxypropyl cellulose, polyvinyl alcohol, polyvinyl pyrrolidone, carboxyvinyl polymer, sodium polyacrylate, polyethylene glycol, ethylene oxide / propylene oxide block copolymer, gum arabic, sodium alginate, xanthan gum, casein, guar gum, locust bean gum And a bentonite thickener.

In the water-based cosmetic composition thus obtained, the pigment particles can be dispersed in a very fine state and uniformly, so that a product having excellent coloring properties and gloss can be obtained. Can be. In addition, since a pigment dispersion containing no organic solvent can be obtained, there is also an advantage that a product can be provided which does not require attention to harmfulness to living organisms, flammability, solvent odor, and the like. In addition, the distribution of the pigment in the cosmetic composition obtained by using the pigment dispersion of the present invention can be such that at least 90% or more of the pigment particles have a dispersion diameter of 0.7 μm or less. is there.

[0024]

EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples. (Example 1) Purified water 68.4 parts by weight Alkyl acrylate copolymer 5.0 parts by weight Strong ammonia water 0.2 parts by weight 1.3 butylene glycol 5.0 parts by weight Phenoxyethanol 0.7 parts by weight Paraoxybenzoate Methyl acid 0.3 part by weight Propyl parahydroxybenzoate 0.1 part by weight Disodium edetate 0.1 part by weight 0.2 part by weight 2-amino-methyl-1-propanol 0.2 parts by weight Blue No. 404 20.0 parts by weight

The above components are mixed and dispersed by a bead mill while confirming the particle size distribution using “Microtrac UPA MODEL: 9340-UPA” (manufactured by Nikkiso Co., Ltd.). 0.37μ
m or less was obtained. The average dispersion diameter of the pigment in this pigment dispersion was 0.12 μm, and the viscosity was 6 cps. This pigment dispersion did not show any sediment even after 3 months. Also, the average dispersion diameter at room temperature and 50 ° C., p
H, viscosity, particle size distribution of pigment particles, and hue were all stable after 3 months.

(Example 2) Purified water 75.5 parts by weight Polyoxyethylene alkyl (12-16) ether phosphoric acid 3.0 parts by weight Polyoxyethylene oleyl ether 0.4 parts by weight Sodium hydroxide 0.15 parts by weight 1.3 butylene glycol 5.0 parts by weight Phenoxyethanol 0.7 parts by weight Methyl parahydroxybenzoate 0.3 parts by weight Red No. 202 20.0 parts by weight

The above components were mixed and dispersed in a bead mill while confirming the particle size distribution using “Microtrac UPA MODEL: 9340-UPA” (manufactured by Nikkiso Co., Ltd.), and 90% or more of pigment particles were 0.36 μm. The following pigment dispersion was obtained. The average dispersion diameter of the pigment in this pigment dispersion was 0.15 μm, and the viscosity was 4 cps. This pigment dispersion did not show any sediment even after 3 months. Further, all of the average dispersion diameter at room temperature and 50 ° C., the pH, the viscosity, the particle size distribution of the pigment particles, and the hue were stable even after lapse of three months.

(Comparative Example 1) Purified water 72.0 parts by weight Polyvinylpyrrolidone 3.0 parts by weight 1.3 butylene glycol 5.0 parts by weight Phenoxyethanol 0.7 parts by weight Methyl parahydroxybenzoate 0.3 parts by weight Red No. 226 20.0 parts by weight

The above components were mixed and dispersed in a bead mill to obtain a broad pigment dispersion having a particle size distribution in which 40% or more of pigment particles of 6 μm or more were present. This liquid had separated into two layers when left for 1 hour.

Comparative Example 2 Purified water 64.0 parts by weight 1.3 butylene glycol 5.0 parts by weight Phenoxyethanol 0.7 parts by weight Methyl parahydroxybenzoate 0.3 parts by weight Acrylic resin alkanolamine liquid 10.0 parts by weight Yellow No. 205 20.0 parts by weight

The above components were mixed and dispersed in a bead mill to obtain a pigment dispersion having a broad particle size distribution containing 60% or more of pigment particles having a size of 6 μm or more. This pigment dispersion is
When left for one hour, two layers were separated.

[0032]

According to the present invention, it is possible to obtain a pigment dispersion for cosmetics and a composition for cosmetics in which the dispersion state of the pigment is fine and stable, and which is excellent in coloring property and gloss.

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Claims (6)

[Claims] 1. A pigment dispersion for cosmetics, wherein at least 90% or more of the pigment particles have a dispersion diameter of 0.7 μm or less. 2. A pigment dispersion for cosmetics according to claim 1, which contains at least a pigment, a dispersion medium and a dispersant. 3. The pigment dispersion for cosmetics according to claim 1, wherein the dispersion medium is an aqueous medium. 4. A method for producing a cosmetic composition, comprising blending the pigment dispersion for cosmetics according to claim 1 as a coloring material. 5. A method for producing a cosmetic composition, comprising blending the pigment dispersion for cosmetics according to claim 1 with a polymer emulsion and a thickener. 6. A cosmetic composition characterized in that at least 90% or more of the pigment particles have a dispersion diameter of 0.7 μm or less.