JP7299877B2 - water-based cosmetics - Google Patents

Description

The present invention relates to brightly colored cosmetics. More particularly, the present invention relates to cosmetics that are excellent in redispersibility of pigments even though they contain a large amount of pigments.

Coloring materials for cosmetics include dyes, natural dyes, pigments, and the like. Among them, dyes capable of vivid coloring with a small amount are often used. On the other hand, in recent years, consumers tend to prefer cosmetics using pigments as colorants from the viewpoint of safety to the human body and the environment. Furthermore, in addition to make-up cosmetics, there is a tendency to prefer brightly colored cosmetics for skin care cosmetics, which is an important factor in sales value.

In order to meet the above-mentioned consumer demand, pigments, which are considered to be highly safe, are used as coloring materials in cosmetics, and a larger amount than before is added to cosmetics in order to achieve vivid colors. It is necessary to However, pigments have poor redispersibility, and have the problem of sedimentation and agglomeration over time, resulting in caking when blended in a large amount in cosmetics.

As a method for improving the dispersibility of pigments in cosmetics, a hydrophilized pigment surface-treated with a hydrophilic silane compound or a silane coupling agent (Patent Document 1), or a phosphate ester having a specific perfluoroalkyl group is used. A pigment obtained by neutralizing a compound, a specific N-acylamino acid, and a pigment powder in an aqueous acidic region has been proposed (Patent Document 2).

However, since the above pigments require a surface treatment step before being blended into cosmetics, a simpler method for preventing caking is desired.

Japanese Patent Laid-Open No. 9-104833 JP 2007-154101

SUMMARY OF THE INVENTION An object of the present invention is to provide a cosmetic having excellent redispersibility of pigments in spite of containing a large amount of pigments. Above all, it is an object of the present invention to provide care cosmetics such as brightly colored detergents that have never existed before.

As a result of intensive studies to solve the above problems, the present inventors have found that by blending fine particle powder together with the pigment and adjusting the viscosity of the cosmetic to 10,000 mPa s or less, the blended pigment The inventors have found that the redispersibility of is excellent, and have completed the present invention.

That is, the present invention
Provided is a cosmetic containing (a) fine particle powder having an average primary particle size of 1 to 550 nm, (b) an inorganic pigment, and (c) a surfactant, and having a viscosity of 10,000 mPa·s or less.

According to the present invention, by adopting the above configuration, the pigment is excellent in redispersibility even though the pigment is highly blended, and the pigment is easily and uniformly redispersed by shaking or kneading by hand. It is possible to obtain cosmetics that According to the present invention, cosmetics can be vividly colored without using dyes, and thus safer cosmetics can be realized. In addition, since the cosmetic of the present invention does not require surface treatment of the pigment, the manufacturing process can be simplified and the manufacturing cost can be suppressed.

The cosmetic of the present invention contains (a) a fine particle powder having an average primary particle size of 1 to 550 nm, (b) an inorganic pigment, and (c) a surfactant, and has a viscosity of 10,000 mPa s or less. characterized by Each component constituting the cosmetic of the present invention will be described in detail below.

<(a) fine particle powder having an average primary particle size of 1 to 550 nm>
The fine particle powder (hereinafter sometimes simply referred to as "(a) component") in the present invention is a powder that can be used in ordinary cosmetics, and has an average primary particle size of 1 to 550 nm, preferably 3 to 300 nm. , more preferably a fine particle powder of 5 to 100 nm. The fine particle powder of the present invention is preferably a surface hydrophilic fine particle powder that can be stably dispersed in an aqueous system. It includes hydrophobic or hydrophilic microparticle powders surface-treated with a hydrophilic substance. Specific examples of the fine particle powder of the present invention include silica and titanium oxide.

Here, the "average primary particle size" in the present invention means the size of primary particles measured by a method commonly used in the field of cosmetics, specifically transmission electron micrographs, Alternatively, it is a value obtained as an arithmetic mean of the long axis and short axis of the particles, which is obtained by a laser scattering/diffraction method or the like.

The shape of the fine particle powder of the present invention is not particularly limited, and may be spherical, plate-like, rod-like, or the like.

The amount of component (a) blended in the cosmetic of the present invention is 0.001 to 0.1% by mass, preferably 0.005 to 0.05% by mass, more preferably 0.008 to 0.05% by mass, based on the total amount of the cosmetic. It is 0.03% by mass. If the amount is less than 0.001% by mass, the redispersibility will be poor, and if it exceeds 0.1% by mass, the fine particle powder layer will stand out and the appearance will be poor.

The present invention is based on the discovery that fine particle powder having cores such as silica or titanium oxide has the function of improving the redispersibility of other powder components. Fine particles such as the component (a) of the present invention (sometimes referred to as "nanoparticles") are known to have extremely high adhesion and aggregation properties, making it extremely difficult to control their aggregate state and dispersion. there is In the system of the present invention, when the fine particle powder (component (a)) having the properties described above is mixed with the pigment (component (b)), the fine particle powder settles between the pigments to prevent caking. It is also considered to improve “redispersibility”. Such effects are advantageous effects that are difficult to predict from the prior art.

<(b) pigment>
The pigment in the present invention (hereinafter sometimes simply referred to as "component (b)") is an inorganic pigment that is commonly used as a coloring material in cosmetics, and is not particularly limited. Color pigments, white pigments, pearl luster pigments (pearl agents), lame agents, functional pigments and the like are included.

Extender pigments include, but are not limited to, pulverized clay minerals such as mica, sericite, talc, and kaolin, silicic anhydride, cerium oxide, silica, zinc stearate, synthetic talc, barium sulfate, and bismuth oxychloride. , alumina, and magnesium carbonate.

Coloring pigments include iron oxide (red iron oxide), iron titanate, γ-iron oxide, yellow iron oxide (iron oxyhydroxide), ocher, black iron oxide, carbon, low-order titanium oxide, mango violet, cobalt violet, oxide Examples include chromium, chromium hydroxide, cobalt titanate, ultramarine blue, and dark blue.

Examples of white pigments include titanium dioxide and zinc oxide.

Pearlescent pigments (pearl agents) include titanium dioxide-coated mica (mica titanium), iron oxide-coated mica titanium, carmine-coated mica titanium, carmine/conjo-coated mica titanium, iron oxide/carmine-treated mica titanium, konjo-treated mica titanium, Iron oxide/conjo treated mica titanium, chromium oxide treated mica titanium, black titanium oxide treated mica titanium, acrylic resin coated aluminum powder, titanium oxide coated mica, titanium oxide coated bismuth oxychloride, titanium oxide coated talc, colored titanium oxide coated mica, Titanium oxide-coated synthetic mica, titanium oxide-coated silica, titanium oxide-coated alumina, titanium oxide-coated glass powder, polyethylene terephthalate/polymethyl methacrylate laminated film powder, bismuth oxychloride, fish scale foil, and the like.

Resins and metal powders can be used as lame agents, and polyethylene terephthalate/aluminum/epoxy lamination powder, polyethylene terephthalate/aluminum lamination powder, polyethylene terephthalate/gold lamination powder, polyethylene terephthalate/polyolefin laminated film powder, polyethylene terephthalate/polyolefin lamination powder, etc. Examples include polymethyl methacrylate laminated film powder, polyethylene/polyester laminated powder, polyethylene/polyethylene terephthalate laminated powder, acrylic resin-coated aluminum powder, and the like. Furthermore, those powders colored with legal dyes or inorganic pigments can also be used.

A hydrophilized pigment may be used as these pigments. As the hydrophilized pigment, those subjected to a hydrophilization treatment known in the art can be used. Both organic and inorganic treatments can be used for hydrophilization. Examples of hydrophilizing agents include, but are not limited to, polyhydric alcohols, polysaccharides, water-soluble polymers, metal alkoxides, and water glass.

Examples of functional pigments include boron nitride, photochromic pigments, synthetic fluorine phlogopite, iron-containing synthetic fluorine phlogopite, fine particle composite powder (hybrid fine powder), and the like.

The amount of component (b) in the cosmetic of the present invention is 0.001 to 0.1% by mass, preferably 0.005 to 0.08% by mass, more preferably 0.008%, based on the total amount of the cosmetic. ~0.05% by mass. If the amount of component (b) is less than 0.001% by mass, the cosmetic will have poor color development.

<(c) Surfactant>
The surfactant (hereinafter sometimes simply referred to as "component (c)") in the present invention is a surfactant that is commonly used in cosmetics, and is not particularly limited.

When preparing the cosmetic of the present invention as a cleansing agent, it is preferable to use a foaming surfactant as the component (c). A foaming surfactant is a surfactant that is excellent in emulsifying and dispersing properties and provides foaming when blended in cosmetics, and includes anionic surfactants and nonionic surfactants. Among them, it is preferable to use an anionic surfactant.

The anionic surfactant dissociates the hydrophilic group portion into an anion when dissolved in water, and is not limited to fatty acid soaps (examples include laurate, myristate, palmitate, etc.). and salts include sodium, potassium, etc.), long-chain acyl sulfonates, N-acyl glutamates, carboxylic acid salts such as alkyl ether acetic acid and sodium lauryl glycol acetate, α-olefin sulfonates, There are sulfonic acid type such as alkanesulfonate and alkylbenzenesulfonic acid, sulfuric acid ester type such as higher alcohol sulfuric acid ester salt, phosphoric acid ester salt type and the like. As the anionic surfactant of the present invention, a sulfate salt type is preferably used. Specific examples include polyoxyethylene alkyl ether sulfates.

Specific compounds include N-lauroyl-N-methyltaurate, N-myristoyl-N-methyltaurate, N-palmitoyl-N-methyltaurate, N-stearoyl-N-methyltaurate, N-cocoyl- N-Methyl Taurate, Ammonium Lauryl Sulfate, Triethylamine Lauryl Sulfate, Triethanolamine Lauryl Sulfate, Monoethanolamine Lauryl Sulfate, Diethanolamine Lauryl Sulfate, Sodium Lauryl Sulfate, Potassium Lauryl Sulfate, Ammonium Cocoyl Sulfate, Sodium Cocoyl Sulfate, Potassium Cocoyl Sulfate, Cocoyl Sulfate Monoethanolamine, ammonium laureth sulfate (=POE ammonium lauryl sulfate), triethylamine laureth sulfate (=POE triethylamine lauryl sulfate), triethanolamine laureth sulfate (=POE triethanolamine lauryl sulfate), monoethanolamine laureth sulfate (=POE monolauryl sulfate) ethanolamine), laureth sulfate diethanolamine (=POE lauryl sulfate diethanolamine), sodium laureth sulfate (=POE sodium lauryl ether sulfate), potassium laureth sulfate (=POE potassium lauryl sulfate), sodium tridecylbenzenesulfonate, sodium dodecylbenzenesulfonate , ammonium lauroyl sulfate, sodium lauroyl sulfate, potassium lauroyl sulfate, triethanolamine lauroyl sulfate, monoethanolamine lauroyl sulfate, polyoxyethylene (2 mol) sodium lauryl ether sulfate, sodium methyl taurate of coconut oil fatty acid, and the like. Among them, it is preferable to use sodium polyoxyethylene lauryl ether sulfate.

Nonionic surfactants are those with hydrophilic groups that do not ionize when dissolved in water. The nonionic surfactant of the present invention is not particularly limited as long as it is commonly used in cosmetics, and includes polyglyceryl laurate, polyglyceryl lauryl ether, polyethylene glycol diisostearate, coconut oil fatty acid diethanolamide (cocamide DEA), and the like. is preferably used.

As the surfactant of the present invention, one type may be used alone, or two or more types may be used in combination.

When the cosmetic of the present invention is prepared as a cosmetic other than a cleansing agent, such as a massage cosmetic, an anionic surfactant, a nonionic surfactant, a cationic surfactant and an amphoteric surfactant are used as the component (c). Any of the active agents may be used. In this case, it is preferable to add crushed agar gel or the like to facilitate application to the skin.

The content of component (c) in the cosmetic of the present invention is 1 to 30% by mass, preferably 3 to 20% by mass, more preferably 5 to 15% by mass, based on the total amount of the cosmetic. If the content of component (c) is less than 1% by mass as a pure content, the cosmetic does not have sufficient viscosity, resulting in poor foaming and detergency.

The cosmetic composition of the present invention has different suitable viscosities depending on the application, but from the viewpoint of powder dispersion stability, the viscosity measured at 30° C. using a BL viscometer is 10,000 mPa s or less. It is characterized by adjusting to When the cosmetic of the present invention is prepared as a cleansing agent, it is preferably 8,000 mPa·s or less, more preferably 6,000 mPa·s or less.

In the cosmetic composition of the present invention, by blending the above-mentioned components (a) to (c) and setting the viscosity of the cosmetic composition to 10,000 mPa·s or less, more pigments than in the past can be blended. In spite of the presence of the pigment, sedimentation and agglomeration of the pigment over time are suppressed, and a cosmetic having excellent redispersibility of the powder component can be obtained.

<(d) amphoteric surfactant>
In addition, in the cosmetics of the present invention, when an anionic surfactant is used as the component (c) to prepare a cleansing agent, if an amphoteric surfactant is further added, cord-like micelles are formed in the solution. , the solution has an appropriate viscosity without the addition of other thickening agents, and the dispersibility of the pigment at rest is further improved.

The amphoteric surfactant (hereinafter sometimes simply referred to as "(d) component") in the present invention is commonly used in cosmetics as an amphoteric surfactant, and is not particularly limited.
An amphoteric surfactant has at least one cationic functional group and at least one anionic functional group, and generally has the property of dissociating an anion under alkaline conditions and a cationic amphoteric ion under acidic conditions. Amphoteric surfactants include imidazoline, amidoamine oxide, amidobetaine, amidosulfobetaine, and carbobetaine surfactants. Carbobetaine-based surfactants are preferably used as the amphoteric surfactant of the present invention. Specific examples include imidazolinium betaines, alkylbetaines, and amidobetaines.

Specific compounds include 2-undecyl-N,N,N-(hydroxyethylcarboxymethyl)-2-imidazoline sodium, 2-cocoyl-2-imidazolinium hydroxide-1-carboxyethyloxy disodium salt, 2 -heptadecyl-N-carboxymethyl-N-hydroxyethylimidazolinium betaine, lauryldimethylaminoacetate betaine, coconut fatty acid amidopropyl betaine, 2-alkyl (C8-18)-N-carboxymethyl-N-hydroxyethylimidazoline nium betaine and the like. Among them, it is preferable to use coconut oil fatty acid amidopropyl betaine.

The content of component (d) in the cosmetic of the present invention is 1 to 30% by mass, preferably 2 to 20% by mass, more preferably 3 to 10% by mass, based on the total amount of the cosmetic. If the content of component (d) is less than 1% by mass as a pure content, the cosmetic composition will not be viscous, and if it exceeds 30% by mass, it will irritate the skin.

In addition, since the cleansing agent of the present invention imparts an appropriate viscosity to the cosmetic as a whole by blending an anionic surfactant and an amphoteric surfactant, it can be used as a thickening agent commonly used for adjusting the viscosity of cosmetics. Does not require compounding. Therefore, the cleaning agent of the present invention includes an aspect in which no thickening agent is blended.

By blending the crushed agar gel in the cosmetic of the present invention, it is possible to impart a soft scrubbing effect when applied to the skin. An agar gel can be blended in both when the cosmetic of the present invention is prepared as a cleansing agent and when it is prepared as a massage cosmetic or the like. In this case, the crushed agar gel preferably has a size of 1 mm or less.

In addition to the above-described essential ingredients, the cosmetic of the present invention may contain components commonly used in cosmetics, such as water, oil, alcohols, moisturizing agents, lipophilic surfactants, oil-based surfactants, oil phase thickeners, Whitening agents, anti-inflammatory agents, various plant extracts, pH adjusters, dispersants, antioxidants, fragrances, stabilizers, etc. may be added as appropriate.

The form of the cosmetic according to the present invention is not particularly limited, and it can be used as skin care cosmetics, makeup cosmetics, and the like. Among them, it is particularly suitable as a cleaning agent because it can provide detergency and appropriate viscosity by blending a specific surfactant. According to the cosmetic composition of the present invention, it is possible to obtain a cosmetic composition that has a more vivid color than conventional detergents due to the high content of pigments.

The cosmetic of the present invention can be produced by a conventional method as a cosmetic containing powder.

EXAMPLES The present invention will be described in more detail below with specific examples, but the present invention is not limited to the following examples. In addition, unless otherwise specified, the compounding amounts in the following examples and the like are shown in mass %.

Prior to the Examples, the effect of fine particle powder on redispersibility was examined. Specifically, the components shown in Table 1 below are mixed and dissolved to prepare solutions A to D, transferred to a container, centrifuged at room temperature at 5000 rpm for 3 hours, and then the container is slowly shaken up and down 10 times. The state of redispersibility of the pigment when it was crushed was visually observed.

Bentonite is an aqueous thickening agent traditionally used to improve the redispersibility of powdered ingredients. As a result of the test, caking of the pigment occurred in solution D containing neither silica nor bentonite, but the pigment (yellow iron oxide) redispersed satisfactorily in solution A containing fine particle silica. On the other hand, in the system in which the present pigment was highly blended, caking occurred even when bentonite, which was conventionally used to improve the redispersibility of the powder component, was blended (solution C). Further, when silica having a large average primary particle size was used, no effect of improving the redispersibility of the pigment was observed (solution B).

Next, cosmetics having compositions shown in Tables 2 and 3 below were prepared, and (1) viscosity measurement and (2) pigment redispersibility evaluation were performed. Evaluation was performed as follows.

(1) Measurement of Viscosity The prepared sample was placed in a wide-mouthed container and allowed to stand at 30° C. for 1 day, and then the viscosity (mPa·s) was measured with a BL-type viscometer (rotor No. 6, 10 revolutions).

(2) Evaluation of redispersibility The prepared sample was placed in a pouch container, allowed to stand at 70°C for 3 days, and then rubbed by hand to evaluate the state when the powder component was redispersed.

(Examples 1-3)
Of the compositions shown in Table 2 below, a detergent was prepared by mixing water phase components, heating and dissolving the mixture, and then adding and mixing agar gel.

As shown in Table 2, no pigment caking occurred in any of the cleaning agents, and brightly colored cleaning agents with excellent pigment redispersibility were obtained. In addition, the detergents of Examples 1 to 3 contained an anionic surfactant (POE sodium lauryl ether sulfate) and an amphoteric surfactant (coconut fatty acid amidopropyl betaine) without blending a thickener for viscosity adjustment. By blending with, it was possible to obtain an appropriate viscosity.

(Examples 4-6)
Of the compositions shown in Table 3 below, components other than the agar gel were mixed, heated and dissolved, and then the agar gel was added and mixed to prepare a liquid soap detergent.

As shown in Table 3, no caking of the pigment occurred in any of the liquid detergents, and vividly colored liquid detergents with excellent pigment redispersibility were obtained.

Claims (4)

(a) 0.001 to 0.1% by weight of hydrophilic silica having an average primary particle size of 5 to 100 nm;
(b) 0.001 to 0.1% by mass of at least one inorganic pigment selected from colored pigments and white pigments, and (c) a surfactant,
An aqueous cosmetic having a viscosity of 950 to 10,000 mPa·s. The cosmetic according to claim 1, wherein the component (c) is a foaming surfactant. 3. The cosmetic according to claim 1, wherein the component (c) is an anionic surfactant, and in which case the cosmetic further contains (d) an amphoteric surfactant. The cosmetic according to any one of claims 1 to 3, which is a cleansing agent.