JP2004002887A - Pigment dispersion and cosmetics - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pigment dispersion which is high in pigment dispersion stability and cosmetics. <P>SOLUTION: In the pigment dispersion which contains a pigment consisting of titanium oxide and/or zinc oxide, a dispersing medium comprising liquid oil and a dispersant, a reactive organic modified silicone is used as the dispersant. The pigment dispersion is used for the cosmetics. <P>COPYRIGHT: (C)2004,JPO

Description

The present invention relates to a pigment dispersion of titanium oxide and zinc oxide which are white pigments, and a cosmetic containing the same.

Titanium oxide and zinc oxide are widely used in the field of cosmetics and the like as white pigments for concealing skin troubles, and in recent years, organic and organic UV-protective agents that are chemically and physically stable and have high safety are used. It is widely used in place of UV absorbers.
Such inorganic pigments can exhibit various characteristics by changing the particle size, shape, and the like.For example, in the case of titanium oxide, in order to scatter visible light and exert a hiding power, the primary pigment has a particle size of 0%. It is desirable that the particles have a particle size (pigment grade) of 0.2 to 0.3 μm, and in order to effectively exert the ultraviolet protection effect, it is required that the particles be 0.1 μm or less.

However, pigments generally have lower dispersibility as the particle size decreases, and the pigments tend to aggregate when dispersed in a base, so that in cosmetics, the color becomes dull and the transparency is lost, or unnatural whiteness is lost. However, there has been a problem in that the emphasis is increased, and the spread (elongation) to the skin is deteriorated and the feeling of use is reduced.
2. Description of the Related Art In cosmetics, there is known a technique of performing a predetermined modification treatment in order to enhance the dispersibility, adhesion, dispersibility, and the like of powders such as pigments (Patent Documents 1 and 2).
JP-A-5-221827 JP-A-5-339518

In view of the above, an object of the present invention is to provide a pigment dispersion having a high dispersion stability of a white pigment, and a cosmetic composition having a transparent feeling and a natural finish.

The present inventors have found that the use of a reactive organically modified silicone as a dispersant for a pigment dispersion can improve the dispersion stability of a pigment, and have completed the present invention.
That is, the pigment dispersion according to the present invention is a pigment dispersion containing a pigment composed of titanium oxide and / or zinc oxide, a dispersion medium composed of liquid oil, and a dispersant, wherein the dispersant is a reactive organic modified silicone. It is characterized by being. By using a reactive organically modified silicone as a dispersant, the dispersion stability of the pigment is improved, and the pigment is less likely to settle and is more easily redispersed, and the stability is maintained for a long time. This is thought to be due to the interaction between the basic group and acidic group of the dispersant and the basic and acidic sites of the pigment particles. Also, since the dispersibility of the pigment is improved when the reactive organic modified silicone is used as compared with the non-reactive organic modified silicone, the viscosity of the pigment dispersion is increased even when a large amount of the pigment is mixed (for example, 20% by weight or more). Can be significantly reduced, and the compounding amount in a base material such as cosmetics can be increased, and its usability can be improved. This is because, when the dispersion state of the particles in the dispersion is good, the cohesive force between the particles is smaller than in the case where the dispersion is bad, and therefore, when the dispersion is flowed, the stress on the dispersion is also reduced and the viscosity is reduced. It is considered that, when the particles are not concentrated, if the particles are well dispersed, the chance of collision between the particles decreases.

Here, the reactive organically modified silicone is different from a so-called pure (straight) silicone obtained by directly hydrolyzing and polymerizing organochlorosilane, and in the course of its synthesis, a reaction with another organic compound is carried out. Those modified with a reactive organic group (reactive organic group), that is, a silicone in which hydrogen, a methyl group, or a phenyl group bonded to a silicon atom is substituted with an arbitrary reactive organic group. In other words, a silicone oil is used in the present invention.

（式中、Ｒ_１，Ｒ_２はそれぞれ独立に−（ＣＨ_２）_ｍ−で示される直鎖アルキルであって、ｍは１〜１５の整数である。）
　また、顔料分散体中の顔料の含量は１〜７０重量％であり、分散剤の含量は０．１〜１０重量％であることが好ましい。 In a preferred embodiment, the reactive organically modified silicone comprises an amino-modified silicone and / or a carboxyl-modified silicone. Further, the reactive organically modified silicone has a polydimethylsiloxane skeleton, in which one or more methyl groups on the side chains and / or terminals are substituted with one or more substituents selected from the following substituent groups. It is preferable that

(In the formula, R ₁ and R ₂ are each independently linear alkyl represented by — (CH ₂ ) _m —, and m is an integer of 1 to 15.)
The content of the pigment in the pigment dispersion is preferably 1 to 70% by weight, and the content of the dispersant is preferably 0.1 to 10% by weight.

Next, the cosmetic according to the present invention is characterized by containing the pigment dispersion of the present invention. This makes it possible to obtain a cosmetic having good pigment dispersibility over a long period of time. As a result, the cosmetics have good elongation, the transparency of the applied film is improved, the powder is not powdery, and there is no unnatural whitening. In addition, as a makeup cosmetic, since it has a high dispersibility of pigment, it is possible to provide a cosmetic having good hiding power with a smaller amount of pigment than in the past. Furthermore, since the pigment dispersion of the present invention has a lower viscosity than conventional dispersions even if it contains a large amount of pigment, it is possible to increase the blending amount of white pigment into cosmetics without impairing usability. As a result, it is possible to provide a cosmetic having higher usability and ultraviolet protection effect than before.

Since the pigment dispersion of the present invention uses a reactive organically modified silicone as a dispersant, the dispersion stability of the pigment is improved, the pigment is unlikely to settle, and the pigment is easily redispersed. Can be maintained.
Since the cosmetic of the present invention uses this pigment dispersion, the dispersibility of the pigment is good over a long period of time, the transparency of the coating film is improved, the powder is not powdery, and it is not unnaturally white. Cosmetics. Furthermore, as a makeup cosmetic, it is possible to provide a cosmetic having a good hiding power with a smaller amount of the pigment than before, and a higher concentration of the pigment than before to provide a cosmetic having a high ultraviolet protection effect. Can be provided.

The pigment dispersion of the present invention contains a pigment composed of titanium oxide (titanium dioxide) and / or zinc oxide, a dispersion medium composed of a liquid oil, and a dispersant composed of a reactive organically modified silicone.
As the pigments, titanium oxide and zinc oxide, those commonly used in cosmetics and the like can be used, and those having an arbitrary particle diameter, shape, and crystalline state may be selected according to the purpose. For example, it is a particle diameter such as fine particles, medium particle diameter, pigment grade, etc., and titanium oxide is amorphous, anatase, rutile, etc. in the form of particles (spheres), needles, spindles, plates, flakes, etc. In the case of zinc oxide, a spherical or plate-like hexagonal crystal can be used as appropriate. It is also preferable to use a combination of particles having different particle diameters and shapes. As for the particle diameter, those having an average particle diameter of about 1 nm to 10 μm can be used. However, for titanium oxide, a particle diameter of about 0.2 to sufficiently scatter visible light in order to exert a hiding power. Use a material with a particle size of about 0.01 to 0.1 μm in order to sufficiently block ultraviolet rays, and use a material with a particle size of about 0.02 to 0.04 μm to block UVB. Is preferred. As the zinc oxide, a pigment grade having a particle size of about 0.1 to 0.5 μm and a fine grain grade having a particle size of about 0.01 to 0.04 μm can be preferably used depending on the purpose. Titanium oxide and zinc oxide may be used together in any ratio.

As these pigment powders, those obtained by subjecting part or all of them to a hydrophobic treatment in order to improve dispersibility can also be preferably used. Examples of the hydrophobizing surface treatment method include methyl hydrogen polysiloxane, chain dimethyl polysiloxane, methyl phenyl polysiloxane, cyclic dimethyl polysiloxane, alkyl-modified dimethyl polysiloxane, fluorine-modified organo hydrogen polysiloxane having a perfluoroalkyl group, Examples include generally used methods such as a method using a silicone compound and a fluorine compound such as fluoroalkyldi (oxyethyl) amine phosphates, a method using a metal soap, a higher fatty acid, and the like. Absent. Among them, a methylpolysiloxane treatment, a methylhydrogenpolysiloxane treatment, and a fluorine treatment are preferably used.

Liquid oil as a dispersion medium for dispersing the above pigment is not particularly limited as long as it is an oil that is liquid at normal temperature, for example, avocado oil, almond oil, olive oil, sesame oil, sasanqua oil, safflower oil Vegetable liquid oils such as soybean oil, camellia oil, corn oil, rapeseed oil, persic oil, castor oil, cottonseed oil, peanut oil; animal liquid oils such as mink oil, egg yolk oil; liquids such as liquid lanolin, jojoba oil Waxes; liquid hydrocarbon oils such as liquid paraffin and squalane; liquid silicone oils and the like can be used alone or in combination of two or more. Among them, silicone oils can be preferably used. In particular, dimethylpolysiloxane (kinematic viscosities of 0.65 × 10 ⁻⁶ , 1 × 10 ⁻⁶ , 1.5 × 10 ⁻⁶ , 2 × 10 ⁻⁶ , 5 × 10 ⁻⁶ , × 10 ⁻⁶ m ² / s, etc .: 1 × 10 ⁻⁶ m ² / s = 1 cs; centi Strokes), volatile silicones such as cyclomethicone (4,5,6 hexamer), and methylphenylpolysiloxane are preferable. .

反 応 Reactive organically modified silicone is used as the dispersant. Examples of the organic group having reactivity (reactive organic group) include an aminoalkyl group, an epoxy ring-containing organic group, a hydroxyalkyl group, a carboxyalkyl group, and the like. It is preferable to use an amino-modified silicone or a carboxyl-modified silicone modified with a carboxyl group. Here, the position of introduction (substitution) and the number of introduction of the reactive organic group are not particularly limited. For example, a side chain type in which a side chain is substituted, a both terminal type in which both terminals are substituted, and one terminal May be any of a single-terminal type in which is substituted, a double-terminal side chain in which a side chain and both terminals are substituted, and a single-terminal type in which a side chain and one terminal are substituted. In particular, those containing a side chain type substituent are preferable from the viewpoint of the dispersion effect.

These reactive organic modified silicones may be used alone or in combination of two or more. Further, one or more non-reactive organic modified silicones may be used in combination. Examples of the non-reactive organic-modified silicone include polyether-modified silicone, alkyl-modified silicone, fluorinated alkyl-modified silicone, higher fatty acid ester-modified silicone, and higher alkoxy-modified silicone. In addition to the modification with a reactive organic group, a silicone partially modified with a non-reactive organic group (carboxyl-polyether modification, amino-polyether modification, etc.) can also be used.

（式中、Ｒ_１，Ｒ_２はそれぞれ独立に−（ＣＨ_２）_ｍ−で示される直鎖アルキルであって、ｍは１〜１５の整数である。）
　上記において、特に、分散効果の観点からｍは１〜１０であることが好ましい。 Particularly preferably, this dispersant has a polydimethylsiloxane skeleton, and one or more methyl groups on the side chains and / or terminals thereof are substituted with one or more substituents selected from the following group. It is preferable to use silicone.

(In the formula, R ₁ and R ₂ are each independently linear alkyl represented by — (CH ₂ ) _m —, and m is an integer of 1 to 15.)
In the above, it is particularly preferable that m is 1 to 10 from the viewpoint of the dispersion effect.

（式中、ａは３０〜５００の整数であり、ｂは１〜２０の整数であり、ｃは１０〜３００の整数である。） Specifically, modified silicones represented by the following general formulas (I) to (V) can be preferably used. (I) represents a side chain type, (II) represents a double-ended type, (III) represents a single-ended type, (IV) represents a single-ended side chain type, and (V) represents a double-ended side chain type. X represents an arbitrary substituent selected from the above group.

(In the formula, a is an integer of 30 to 500, b is an integer of 1 to 20, and c is an integer of 10 to 300.)

The amount of each component in the pigment dispersion can be appropriately set according to its use, etc., but the content of the pigment is preferably 1% by weight or more in order to efficiently exert the function of the pigment. From the viewpoint of chemical conversion, the content is preferably 70% by weight or less, and particularly preferably 5 to 60% by weight. Further, the content of the dispersant is preferably at least 0.1% by weight in order to obtain a sufficient dispersing effect, and is preferably at most 10% by weight from the viewpoint of feeling of use when used as a cosmetic or the like. If the amount of the dispersant is too large, it may be sticky when blended in a cosmetic.

In addition to the above pigments, dispersion media, and dispersants, the pigment dispersion of the present invention includes, as other components, components generally used in cosmetics and the like, for example, extenders, color pigments, fragrances, antioxidants, and metals. Even if an ion sealant, an antibacterial / antifungal agent, an ultraviolet absorber, an oil / fat, a wax, a fatty acid, a higher alcohol, a polyhydric alcohol, etc. are contained within a range not to impair the effects of the present invention. Good.

The pigment dispersion of the present invention can be produced according to a conventional method using a general disperser / emulsifier such as a propeller mixer, a disper, a homomixer, etc., and is widely applied to pharmaceuticals, cosmetics, quasi-drugs, and the like. However, it is particularly suitable for application to cosmetics, especially makeup cosmetics (base makeup cosmetics and point makeup cosmetics) and cosmetics having an ultraviolet protection effect.

Next, the cosmetic of the present invention contains the above-mentioned pigment dispersion of the present invention. A plurality of different types of pigment dispersions may be included.

The cosmetics include those of any use and dosage form, for example, two- or three-layered foundation cosmetics such as lotions, emulsions, creams, etc .; emulsions, creams, oily ointments, oily sticks And foundations in the form of powder (base makeup cosmetics); point makeup cosmetics such as eye colors and cheek colors; and lip cosmetics such as lip balms and lipsticks. Among them, a makeup cosmetic or a cosmetic having an ultraviolet protection effect is preferable because the hiding power and the ultraviolet protection power of the pigment can be sufficiently exhibited.

The content of the pigment dispersion in the cosmetic is not particularly limited, and can be appropriately set in the range of 1 to 90% by weight depending on the type and form of the cosmetic and the composition of the pigment dispersion. .

In addition to the above-described pigment dispersion of the present invention, an appropriate amount of an arbitrary component can be contained in the cosmetic depending on the purpose of use. Such components include, for example, fats and oils, waxes, hydrocarbons, fatty acids, higher alcohols, esters, lower alcohols, polyhydric alcohols, humectants, various vitamins, whitening agents, cell activation Agents, anti-inflammatory agents, surfactants, water-soluble polymer compounds, gelling agents, antioxidants, metal ion sealants, antibacterial and antifungal agents, pigments, fragrances, etc. Raw material components. In addition to white pigments, powders such as extender pigments, coloring pigments, pearlescent pigments and the like may be contained, and especially in sunscreen cosmetics for the purpose of ultraviolet protection, organic ultraviolet absorbers May be used in combination.
The cosmetic of the present invention can be manufactured by a general method using various general manufacturing apparatuses.

Hereinafter, the present invention will be described in more detail with reference to Examples. In Examples,% by weight is simply expressed as%.
(1) Evaluation of pigment dispersion stability [Examples 1 to 12, Comparative Examples 1 to 9]
Predetermined amounts of the pigment, dispersant, and dispersion medium (polydimethylsiloxane) shown in Tables 1 and 2 were weighed into a test tube, premixed with a vortex mixer for 1 minute, and then stirred with ultrasonic waves for 1 hour. In Tables 1 and 2, the fine particle titanium oxide was TTO-55 (N) manufactured by Ishihara Sangyo Co., Ltd. (average particle size: 0.035 μm), and the fine particle zinc oxide was FINEX-50 manufactured by Sakai Chemical Co., Ltd. (average particle size: 0.02 μm), N-modified SC is side-chain type amino-modified silicone: KF-867S (1300 cs) manufactured by Shin-Etsu Chemical Co., Ltd. C-modified silicone is side-chain carboxy-modified silicone: X22- manufactured by Shin-Etsu Chemical Co., Ltd. 3701E (3000 cs) and PO-modified SC indicate side chain type polyether-modified silicone: KF-6016 (150 cs) manufactured by Shin-Etsu Chemical Co., Ltd., respectively.

分散 The degree of dispersion of the obtained pigment dispersion was measured after 1, 2, 6, 24 hours. Here, it is represented by [dispersion degree = height (mm) from gas-liquid interface to sedimentation interface / total height of dispersion liquid (mm)]. The results are also shown in Tables 1 and 2.

As shown in the above Tables 1 and 2, the pigment dispersions of the examples using the reactive organic modified silicone were compared with the comparative examples using no dispersant or using a non-reactive organic modified silicone as the dispersant. And the dispersion stability was excellent. Further, when the long-term stability of the pigment dispersions of Examples 1 to 9 was examined, a good dispersion state was maintained even after one month.

(2) Evaluation of viscosity of pigment dispersion [Examples 13, 14 and Comparative Example 10]
Each of the components shown in Table 3 (400 g in total) was charged into a bead mill (DISPERMAT SL, manufactured by VMA, media: zirconia, 0.5 mm) and stirred for 25 minutes to prepare a pigment dispersion. In the table, the same pigment and dispersant as described above were used.
A 70 ml mayonnaise bottle was used as a viscosity measurement container. Each pigment dispersion sample was put in the bottle, stored in a thermostat at 25 ° C. for 24 hours, and the viscosity was measured using a B-type viscometer (manufactured by Tokyo Seiki) ( Rotation speed: 6 rpm, measurement time: 1 minute, measurement temperature: 25 ° C., rotor: No. 3). The results are also shown in Table 3.

As shown in Table 3 above, the viscosity of the pigment dispersion of the example using the reactive organically modified silicone was found to be significantly lower than that of the pigment dispersion of the comparative example using the non-reactive organically modified silicone. did.

(3) Usability evaluation of cosmetics Preparation of Pigment Dispersion Dispersions 1 to 9 were prepared by using the components shown in Table 4 and dispersing them in a bead mill for 5 minutes. Further, as dispersions of Comparative Examples, dispersions 1c to 9c in which each of the reactive organic-modified silicone dispersants of Dispersions 1 to 9 was replaced with non-reactive polyether-modified silicone were prepared in the same manner. The pigment used is the one that has been surface-treated with silicone.In the table, the silicon-treated particulate titanium oxide is SI-TTO-55 (N), the silicone-treated particulate zinc oxide is SI-FINEX-50, and the silicone-treated titanium oxide is SA-oxidized. Titanium CR-50 (average particle size: 0.25 μm), siliconized zinc oxide is SI-fine zinc white (average particle size: 0.1 μm) (all manufactured by Miyoshi Kasei Co., Ltd.) Same as above.

B. Preparation of various cosmetics [Example 15: Oil-in-water emulsion]
Ingredients (%)
1) Dispersion 1 16.0
2) Cetanol 1.0
3) Beeswax 0.5
4) Squalane 2.0
5) Polyoxyethylene (10E.O.) monooleate 1.0
6) Glyceryl monostearate 1.0
7) 1,3-butylene glycol 4.0
8) Glycerin 4.0
9) Purified water 55.2
10) Methyl paraoxybenzoate 0.1
11) Carboxyvinyl polymer (1% aqueous solution) 15.0
12) Potassium hydroxide 0.1
13) Fragrance 0.1
Total 100.0
The oil phase components 1) to 6) were mixed and dissolved by heating to 70 ° C. On the other hand, the aqueous phase components 7) to 10) were mixed and dissolved, and the mixture was heated to 70 ° C. This aqueous phase was added to the oil phase for pre-emulsification, then 11) was added and stirred, and then 12) was added to increase the viscosity and homogenized with a homomixer. Thereafter, the mixture was cooled, 13) was added at 40 ° C. and mixed to obtain an oil-in-water emulsion.

[Example 16: Oil-in-water cream]
Ingredients (%)
1) Dispersion 3 25.0
2) Vaseline 2.0
3) Stearyl alcohol 3.0
4) Palmitic acid 3.0
5) Glyceryl monostearate 3.0
6) Polyethyl acrylate 1.0
7) Tocopherol acetate 0.2
8) Glycerin 7.0
9) Purified water 55.4
10) Potassium hydroxide 0.2
11) Methyl paraoxybenzoate 0.1
12) Fragrance 0.1
Total 100.0
1) was dispersed in a mixture obtained by mixing and heating and dissolving the above oil phase components 2) to 7), and then heated to 70 ° C. On the other hand, the aqueous phase components 8) to 11) were mixed and dissolved, and the mixture was heated to 70 ° C. This aqueous phase was added to the oil phase with stirring, and emulsified by a homogenizer. Thereafter, the mixture was cooled, 12) was added at 40 ° C. and mixed to obtain an oil-in-water cream.

[Example 17: Sunscreen emulsion]
Ingredients (%)
1) Dispersion 2 25.0
2) Dispersion 4 14.0
3) Methylphenyl polysiloxane 9.0
4) Polyether-modified silicone 3.0
5) Organically modified montmorillonite 1.5
6) Oxybenzone 3.0
7) 2-Ethylhexyl paramethoxycinnamate 5.0
8) 1,3-butylene glycol 5.0
9) Purified water 34.3
10) Methyl paraoxybenzoate 0.1
11) Fragrance 0.1
Total 100.0
The above components 1) to 7) were mixed and stirred to obtain an oil phase. On the other hand, the components 8) to 10) were mixed and dissolved to obtain an aqueous phase. The aqueous phase was added to the oil phase with stirring at room temperature, and the mixture was uniformly emulsified with a homomixer. After emulsification, 11) was added and mixed to obtain a sunscreen emulsion.

[Example 18: Two-layer type base lotion]
Ingredients (%)
1) Dispersion 5 12.0
2) Ethanol 10.0
3) Polyoxyethylene (20E.O.) sorbitan tetraoleate 0.3
4) Methyl paraoxybenzoate 0.1
5) Sorbitol 1.5
6) Glycerin 1.0
7) Purified water 75.1
Total 100.0

The alcohol phase obtained by dissolving the above components 3) and 4) in 2) was added to 1) to obtain an oil phase. On the other hand, a mixture obtained by mixing and dissolving the components 5) to 7) was used as an aqueous phase, and the oil phase was added to the aqueous phase at room temperature, followed by stirring and mixing to obtain a two-layer base lotion.

[Example 19: Makeup base cream]
Ingredients (%)
1) Stearic acid 3.0
2) Dispersion 6 6.5
3) Cetanol 1.5
4) Isopropyl palmitate 7.0
5) Self-emulsifying glyceryl monostearate 2.0
6) 1,3-butylene glycol 8.0
7) Potassium hydroxide 0.2
8) Purified water 69.4
9) Methyl paraoxybenzoate 0.1
10) Talc 1.9
11) Yellow iron oxide 0.2
12) Bengala 0.1
13) Fragrance 0.1
Total 100.0
The oil phase components of the above 1) to 5) were mixed and dissolved by heating to 75 ° C. On the other hand, the pigments of 10) to 12) were added to a mixture obtained by mixing and dissolving the aqueous phase components of 6) to 9) at 75 ° C, and dispersed by a homomixer. This aqueous phase was added to the oil phase and uniformly emulsified with a homomixer. After cooling, 13) was added and mixed at 40 ° C. to obtain a makeup base cream.

[Example 20: Creamy foundation]
Ingredients (%)
1) Dispersion 7 22.0
2) Methylphenyl polysiloxane 9.0
3) Squalane 12.0
4) Paraffin wax 1.5
5) Glyceryl diisostearate 3.0
6) Siliconized silica anhydride 5.0
7) Silicone treated talc 7.0
8) Siliconized yellow iron oxide 1.1
9) Siliconized Bengala 0.2
10) Siliconized black iron oxide 0.1
11) Glycerin 5.0
12) Purified water 34.0
13) Methyl paraoxybenzoate 0.1
Total 100.0
The oil phase components of the above 1) to 5) were mixed and dissolved by heating to 60 ° C. Here, each component of 6) to 10) was added and dispersed by a homomixer. The oil phase was gradually added to an aqueous phase obtained by heating and dissolving each of the components 11) to 13) at 60 ° C., and the mixture was uniformly emulsified with a homomixer to obtain a creamy foundation.

[Example 21: Stick-shaped foundation]
Ingredients (%)
1) Isopropyl myristate 10.77
2) Liquid lanolin 3.0
3) Microcrystalline wax 4.0
4) Celerin 8.0
5) Carnauba wax 2.0
6) Sorbitan sesquioleate 1.0
7) Tocopherol acetate 0.2
8) Butyl paraoxybenzoate 0.03
9) Dispersion 8 39.5
10) Dispersion 9 20.0
11) Mica 3.8
12) Kaolin 5.0
13) Yellow iron oxide 2.0
14) Bengala 0.5
15) Black iron oxide 0.2
Total 100.0
The oil phase components 1) to 8) were mixed and dissolved by heating at 70 to 80 ° C, and the components 9) and 10) were added and dispersed. Further, the pigment components of 11) to 15) were added and kneaded with a roll mill. The kneaded material was heated and melted to remove bubbles, then filled in a mold and solidified by cooling.

[Comparative Examples 11 to 17]
The oil-in-water of Comparative Example 11 was prepared in the same manner as in Examples 15 to 21, except that the corresponding dispersions 1c to 9c of the comparative example were used instead of the dispersions 1 to 9 as the dispersion. Emulsion, oil-in-water cream of Comparative Example 12, sunscreen emulsion of Comparative Example 13, two-layer base lotion of Comparative Example 14, makeup base cream of Comparative Example 15, creamy foundation of Comparative Example 16, Comparative Example 17 Was prepared.

C. Usage Test Twenty female panelists in their twenties to fifties were grouped as one group, and the panelists of each group were allowed to use the cosmetic samples of Examples and Comparative Examples blindly for two weeks. After the test, in Examples 15 to 18 and 21 and corresponding Comparative Examples 11 to 14 and 17, the elongation of the cosmetic and the whitening of the finish were evaluated. In Examples 19 and 20, and Comparative Examples 15 and 16, Then, the elongation of the cosmetic and the covering effect (hiding power) were evaluated. In each evaluation, scoring was performed according to the criteria shown below, and the average value of 20 persons was calculated.
(Elongation of cosmetics) Good: 5, Moderately good: 4, Normal: 3, Moderately bad: 2, Bad: 1
(Whitening of finish) Not worried: 4, normal: 3, slightly worried: 2, worried: 1
(Cover effect of finish) Satisfaction: 4, slightly satisfied: 3, slightly dissatisfied: 2, dissatisfied: 1
Table 5 shows the results.

As shown in Table 5 above, in the group using the examples, the elongation of the cosmetic, the whitening of the finish, and the cover effect were all improved, and a good evaluation was obtained. confirmed.

Claims (5)

A pigment dispersion comprising a pigment composed of titanium oxide and / or zinc oxide, a dispersion medium composed of a liquid oil, and a dispersant, wherein the dispersant is a reactive organically modified silicone. The pigment dispersion according to claim 1, wherein the reactive organic-modified silicone includes an amino-modified silicone and / or a carboxyl-modified silicone. 2. The reactive organically modified silicone according to claim 1, wherein one or more methyl groups on a side chain and / or a terminal of polydimethylsiloxane are substituted with one or more substituents selected from the following substituent group. 3. 3. The pigment dispersion according to 2.

(In the formula, R ₁ and R ₂ are each independently linear alkyl represented by — (CH ₂ ) _m —, and m is an integer of 1 to 15.) The pigment dispersion according to any one of claims 1 to 3, wherein the content of the pigment in the pigment dispersion is 1 to 70% by weight, and the content of the dispersant is 0.1 to 10% by weight. A cosmetic comprising the pigment dispersion according to claim 1.