Liquid oil-based cosmetic

Abstract

A liquid oily cosmetic with good redispersibility of hydrophobically treated silica powder is provided. The cosmetic comprises the following components (a) to (c): (a) 5.0 to 60% by mass of volatile silicone oil; (b) 0.1 to 10% by mass of hydrophobically treated silica powder; (c) 0.05 to 5.0% by mass of polyglycerol-modified organosilicon as shown in formula (I), where R1 represents a straight-chain or branched alkyl or phenyl group having 1 to 12 carbon atoms; R2 represents an alkylene group having 2 to 11 carbon atoms; p is a number from 10 to 120; and q is a number from 1 to 11.

Description

Technical Field

[0001] This invention relates to liquid oily cosmetics containing oil-absorbing powders, and more particularly to liquid oily cosmetics using hydrophobically treated silica powder as an oil-absorbing powder. Background Technology

[0002] Liquid oily cosmetics that form a continuous oil phase, such as water-in-oil compositions, are widely used as cosmetics. They are particularly suitable for use as sunscreens / primers / foundations due to their excellent staying power.

[0003] Generally, in liquid oil-based cosmetics, the viscosity is adjusted to be low in order to improve the user experience, such as better spreadability and ease of application. However, in cosmetics with particularly low viscosity, powders sometimes settle and become uneven. In such cases, studies have been conducted to prevent the settling of even low-viscosity powders (Patent Document 1), or methods have been used such as shaking the container just before use to redisperse the settled powders and restore the composition to a uniform state for application (Patent Document 2).

[0004] In addition, various powders are used in cosmetics depending on the purpose, but for the purpose of preventing makeup from coming off due to sebum, powders that absorb sebum, such as spherical organic powders, are mixed in (Patent Documents 3 and 4).

[0005] More specifically, for example, Patent Document 4 discloses a water-in-oil emulsion cosmetic containing the following components (A), (B), (C) and (H): (A) 0.1 to 10% by mass of spherical organic powder with an oil absorption of 1.0 g / g or more and a water absorption of 1.0 g / g or less, (B) 0.1 to 10% by mass of film-forming agent, (C) 5 to 60% by mass of volatile oil, and (H) 5 to 70% by mass of water.

[0006] Existing technical documents

[0007] Patent documents

[0008] Patent Document 1: Japanese Patent No. 4566124

[0009] Patent Document 2: Japanese Patent Application Publication No. 2007-217393

[0010] Patent Document 3: Japanese Patent Application Publication No. 2005-97246

[0011] Patent Document 4: International Publication No. 2019 / 111831 Summary of the Invention

[0012] The problem that the invention aims to solve

[0013] On the other hand, to date, there has been insufficient research on substances obtained by hydrophobizing and mixing inorganic powder silica, which acts as a sebum-absorbing powder, into oil-based cosmetics, especially low-viscosity water-in-oil cosmetics.

[0014] In contrast, the inventors have focused on liquid oily cosmetics that utilize hydrophobically treated silica powder.

[0015] However, through in-depth research by the inventors, it has been found that when hydrophobically treated silica powder is used, problems such as poor dispersibility arise.

[0016] In particular, as mentioned above, for liquid oily cosmetics with low viscosity, hydrophobically treated silica powder dispersed in the oil phase tends to settle easily. When hydrophobically treated silica powder settles, it needs to be agitated to redisperse it. However, it is known that if hydrophobically treated silica powder is used, the dispersibility (defined as "redispersibility" in this application) during redispersive agitation is also poor.

[0017] The present invention aims to improve the above situation and its object is to provide a liquid oily cosmetic with good redispersibility of hydrophobically treated silica powder.

[0018] Methods for solving problems

[0019] The present invention, which achieves the above objectives, is described below.

[0020] Option 1

[0021] A liquid oil-based cosmetic comprising the following components (a) to (c):

[0022] (a) Volatile silicone oil 5.0–60% by mass;

[0023] (b) Hydrophobically treated silica powder 0.1–10% by mass;

[0024] (c) 0.05–5.0% by mass of polyglycerol-modified organosilicon as shown in formula (I) below.

[0025]

[0026] In formula (I), R1 represents a straight-chain or branched alkyl or phenyl group with 1 to 12 carbon atoms; R2 represents an alkylene group with 2 to 11 carbon atoms; p is a number from 10 to 120; and q is a number from 1 to 11.

[0027] Option 2

[0028] According to the cosmetic material described in Scheme 1, the oleic acid in the hydrophobic treated silica powder has an oil absorption capacity of 1.0 ml / g or more.

[0029] Option 3

[0030] According to the cosmetic material described in Scheme 1 or 2, the aforementioned volatile silicone oil is a linear polydimethylsiloxane.

[0031] Option 4

[0032] The cosmetic material according to any one of Schemes 1 to 3 further comprises (e) an ultraviolet scattering agent.

[0033] Option 5

[0034] The cosmetic material according to any one of Schemes 1 to 4 further comprises (f) a film-forming agent.

[0035] <Option 6>

[0036] The cosmetic material according to any one of Schemes 1 to 5 is an oil-in-water type.

[0037] <Option 7>

[0038] According to any one of Schemes 1 to 6, the hydrophobic silica powder mentioned above is silica powder that has undergone organosilicon treatment.

[0039] <Option 8>

[0040] According to any one of Schemes 1 to 7, the above-mentioned polyglycerol modified organosilicon is bisbutyl polydimethylsiloxane polyglycerol-3.

[0041] <Option 9>

[0042] The cosmetic material according to any one of Schemes 1 to 8 is a redispersible cosmetic material that is redispersed by agitation during use.

[0043] The effects of the invention

[0044] According to the present invention, a liquid oily cosmetic with good redispersibility of hydrophobically treated silica powder can be provided. Detailed Implementation

[0045] Liquid oil-based cosmetics

[0046] The liquid oil-based cosmetic of the present invention (hereinafter also referred to as "the cosmetic of the present invention") comprises the following components (a) to (c):

[0047] (a) Volatile silicone oil 5.0–60% by mass;

[0048] (b) Hydrophobically treated silica powder 0.1–10% by mass;

[0049] (c) 0.05–5.0% by mass of polyglycerol-modified organosilicon as shown in formula (I) below.

[0050]

[0051] In formula (I), R1 represents a straight-chain or branched alkyl or phenyl group with 1 to 12 carbon atoms; R2 represents an alkylene group with 2 to 11 carbon atoms; p is a number from 10 to 120; and q is a number from 1 to 11.

[0052] As mentioned above, when hydrophobically treated silica powder is used in oil-based cosmetics, especially low-viscosity water-in-oil cosmetics, problems such as poor redispersibility are known. This is presumably because hydrophobically treated silica powder is a substance that has undergone hydrophobic treatment on the surface of hydrophilic silica powder, so a portion of the powder surface is in a hydrophilic state, thus causing it to aggregate in the oil phase.

[0053] To address this problem, the inventors, through in-depth research, discovered that by mixing the polyglycerol-modified organosilicon shown in formula (I) above, the redispersibility of hydrophobic silica powder becomes particularly good. Although not theoretically limited, it can be considered that this is because, in volatile silicone oil, the polyglycerol-modified organosilicon shown in formula (I) above, used as a dispersant, has a greater affinity for the hydrophobic silica powder than the polyglycerol-modified organosilicon has an affinity for the volatile silicone oil. Therefore, when redispersed by oscillation, the polyglycerol-modified organosilicon is also maintained on the surface of the hydrophobic silica powder, thus functioning to disperse the hydrophobic silica powder in the volatile silicone oil.

[0054] In contrast, it can be argued that other general dispersants do not have sufficient affinity for hydrophobic silica powder, or that they do not have sufficient ability to disperse hydrophobic silica powder in silicone oil.

[0055] Furthermore, while the polyglycerol-modified organosilicon shown in Formula (I) above is known to have been used conventionally as an organosilicon surfactant to disperse metal oxide particles such as titanium dioxide, it does not imply its use from the viewpoint of redispersibility as is present in this invention. Moreover, as shown in Comparative Example 8 described later, it is evident that when redispersing metal oxide particles such as titanium dioxide treated with organosilicon, even when the polyglycerol-modified organosilicon shown in Formula (I) above is mixed in the same manner as in this invention, good redispersibility is not achieved.

[0056] <(a) Volatile silicone oil>

[0057] The cosmetic material of the present invention comprises (a) a volatile silicone oil. By comprising a volatile silicone oil, it is possible to suppress, for example, stickiness, and also to achieve an effect that improves the evenness of the makeup when it is applied over a color cosmetic after the cosmetic material has been applied to the skin.

[0058] Furthermore, in this invention, "volatility" refers to the percentage of volatile matter exceeding 5% after being placed at atmospheric pressure and 105°C for 3 hours. From the viewpoint of further enhancing the effects of this invention, the volatile matter content, as an indicator of volatility, is preferably 10% or more, 20% or more, 40% or more, 50% or more, 60% or more, 80% or more, or 100%. In addition, in this disclosure, "non-volatile" refers to the percentage of volatile matter less than 5% after being placed at 105°C for 3 hours. Here, volatile matter refers to the rate of change of weight measured by gravimetric method when approximately 0.2 g of a sample is added to a glass dish with filter paper placed on it.

[0059] In this invention, examples of volatile silicone oils include, but are not limited to, polydimethylsiloxane. Furthermore, the volatile silicone oil can be chain-like or cyclic. More specifically, the chain-like volatile silicone oil can be linear or branched, with linear chains being particularly preferred.

[0060] In addition, the viscosity of volatile silicone oil can be, for example, 0.7 cs to 3.0 cs.

[0061] In addition, commercially available substances can be used as volatile silicone oils. Examples of commercially available volatile silicone oils include, but are not limited to, organosilicon KF-96A-2cs (polydimethylsiloxane), organosilicon KF-96A-1.5cs (polydimethylsiloxane), and silicone KF56 (diphenylsiloxyphenyl polytrimethylsiloxane) manufactured by Shin-Etsu Chemical Industry Co., Ltd.

[0062] In the cosmetics of the present invention, one or more volatile silicone oils may be used. From the viewpoints of improving spreadability, suppressing stickiness, or improving the evenness of applying the cosmetic to the skin, the content of volatile silicone oil in the cosmetic of the present invention, relative to the total amount of the cosmetic, can be 5.0% by mass or more, 6.0% by mass or more, 7.0% by mass or more, 8.0% by mass or more, 9.0% by mass or more, 10% by mass or more, 11% by mass or more, 12% by mass or more, 13% by mass or more, 14% by mass or more, 15% by mass or more, 16% by mass or more, 17% by mass or more, 18% by mass or more, 19% by mass or more, 20% by mass or more, 21% by mass or more, 22% by mass or more, 23% by mass or more, 24% by mass or more, 25% by mass or more, 26% by mass or more, 27% by mass or more, 28% by mass or more, 29% by mass or more, or 30% by mass or more. Alternatively, it can be 60% by mass or less, 50% by mass or less, 40% by mass or less, or 30% by mass or less.

[0063] <(b) Hydrophobic treated silica powder>

[0064] The cosmetic material of the present invention comprises (b) hydrophobically treated silica powder. By comprising hydrophobically treated silica powder, the cosmetic material of the present invention can absorb sebum, thereby preventing makeup from fading due to sebum.

[0065] In this invention, hydrophobically treated silica powder refers to a substance whose surface has been hydrophobically treated. Here, the hydrophobic treatment can be, for example, an organosilicon-based treatment such as polydimethylsiloxane or polymethylsiloxane. From the viewpoint of further enhancing the effects of this invention, hydrophobically treated silica powder is preferably silica powder that has undergone organosilicon treatment.

[0066] In this invention, the silica powder can be porous silica particles or silica particles with an uneven surface, but from the viewpoint of improving sebum absorption, porous silica particles are preferred. Furthermore, the shape of the silica particles is not particularly limited, and can be, for example, spherical, substantially spherical, or ellipsoidal. In addition, the silica particles can be disintegrating silica particles, particularly silica particles that can be broken down by the shearing force of a finger.

[0067] Furthermore, the average particle size of the hydrophobically treated silica powder is not particularly limited and can be, for example, 1 to 30 μm. Additionally, in this invention, the average particle size can be calculated as the diameter of the equivalent circle of the projected area of ​​a primary particle observed by SEM or TEM.

[0068] In this invention, the oil absorption capacity of the hydrophobic treated silica powder is evaluated by the amount of oleic acid (ml) that 1g of hydrophobic treated silica powder can absorb (i.e., "oil absorption capacity of oleic acid (ml / g)"). Furthermore, oleic acid is a representative unsaturated free fatty acid in sebum. In this invention, the oil absorption capacity of oleic acid in the hydrophobic treated silica powder can be 1.0ml / g or more, 1.1ml / g or more, 1.2ml / g or more, 1.3ml / g or more, 1.4ml / g or more, 1.5ml / g or more, 1.6ml / g or more, 1.7ml / g or more, 1.8ml / g or more, 1.9ml / g or more, 2.0ml / g or more, 2.1ml / g or more, 2.2ml / g or more, or 2.3ml / g or more, and can also be 5.0ml / g or less. In addition, the oil absorption of oleic acid in hydrophobically treated silica powder can be determined by referring to, for example, "JIS-K JIS K 5101-13-1 Japanese Industrial Standard Pigment Test Method - Part 13: Oil Absorption - Section 1: Refined Linseed Oil Method".

[0069] Furthermore, commercially available materials can be used as hydrophobic treated silica powder. Examples of commercially available hydrophobic treated silica powder include SA-SA-705 (product name) manufactured by Miyoshi Chemical Co., Ltd., but it is not limited to this.

[0070] In the cosmetics of the present invention, one or more types of hydrophobically treated silica powder may be used. From the viewpoint of improving sebum absorption, the content of hydrophobically treated silica powder in the cosmetics of the present invention, relative to the total amount of the cosmetics, may be 0.1% by mass or more, 0.5% by mass or more, 1.0% by mass or more, 1.5% by mass or more, 2.0% by mass or more, 2.5% by mass or more, 3.0% by mass or more, 3.5% by mass or more, 4.0% by mass or more, 4.5% by mass or more, 5.0% by mass or more, 5.5% by mass or more, 6.0% by mass or more, 6.5% by mass or more, 7.0% by mass or more, 7.5% by mass or more, or 8.0% by mass or more; or it may be 10% by mass or less, 9.0% by mass or less, 8.0% by mass or less, 7.0% by mass or less, or 6.0% by mass or less.

[0071] <(c) Polyglycerol modified organosilicon>

[0072] The cosmetic of the present invention comprises (c) polyglycerol-modified organosilicon. As described above, the cosmetic of the present invention, by comprising this polyglycerol-modified organosilicon, can improve the redispersibility of hydrophobic treated silica powder. Furthermore, the polyglycerol-modified organosilicon is represented by the following formula (I).

[0073]

[0074] In formula (I), R1 represents a straight-chain or branched alkyl or phenyl group with 1 to 12 carbon atoms; R2 represents an alkylene group with 2 to 11 carbon atoms; p is a number from 10 to 120; and q is a number from 1 to 11.

[0075] The polyglycerol-modified organosilicon shown in formula (I) above can be obtained, for example, as follows: A solution of isopropanol chloroplatinic acid is added to a mixture of polyglycerol diallyl ether and mono-terminated hydrogenated dimethyl polysiloxane, and the mixture is heated / reacted. An aqueous hydrochloric acid solution is then added, followed by superheated hydrolysis. After neutralization by adding sodium bicarbonate solution, the mixture is purified and evaporated to obtain the final product. However, the polyglycerol-modified organosilicon of this invention is not limited to this manufacturing method.

[0076] Examples of polyglycerol-modified organosilicones involved in this invention include, for example, bisbutyl polydimethylsiloxane polyglycerol-3 as defined in cosmetic designations, but are not limited thereto.

[0077] Furthermore, the polyglycerol-modified organosilicon shown in formula (I) above can be made from commercially available materials.

[0078] In the cosmetics of the present invention, one or more polyglycerol-modified organosilicones of formula (I) above may be used. From the viewpoint of improving the redispersibility of hydrophobic treated silica powder, the content of the polyglycerol-modified organosilicon of formula (I) above in the cosmetics of the present invention, relative to the total amount of the cosmetics, may be 0.05% by mass or more, 0.1% by mass or more, 0.2% by mass or more, 0.3% by mass or more, 0.4% by mass or more, 0.5% by mass or more, 0.6% by mass or more, 0.7% by mass or more, 0.8% by mass or more, 0.9% by mass or more, 1.0% by mass or more, 1.2% by mass or more, 1.5% by mass or more, 1.8% by mass or more, 2.0% by mass or more, 2.2% by mass or more, 2.5% by mass or more, 2.8% by mass or more, 3.0% by mass or more, 3.2% by mass or more, or 3.5% by mass or more, and may also be 5.0% by mass or less, 4.0% by mass or less, or 3.0% by mass or less.

[0079] <Other Ingredients>

[0080] The cosmetic material of the present invention may contain, relative to the total amount of the cosmetic material, the aforementioned components (a) to (c) totaling 50% to 90% by mass or more, 60% to 70% by mass or more, 80% to 90% by mass or more. Furthermore, the cosmetic material of the present invention may further contain other components besides the aforementioned components (a) to (c). Hereinafter, other components will be described exemplarily, but the cosmetic material of the present invention is not limited thereto.

[0081] <(d)water>

[0082] The cosmetic material of the present invention may contain (d) water. The water may be any type of water suitable for use in cosmetic materials, such as ion-exchanged water.

[0083] In the cosmetics of the present invention, when water is included, its content relative to the total amount of the cosmetics can be 5.0% or more by mass, 10% or more by mass, 12% or more by mass, 15% or more by mass, 18% or more by mass, 20% or more by mass, 22% or more by mass, 25% or more by mass, 28% or more by mass, 30% or more by mass, 32% or more by mass, 35% or more by mass, 38% or more by mass, 40% or more by mass, 42% or more by mass, or 45% or more by mass. In addition, it can be 70% or less by mass, 60% or less by mass, or 50% or less by mass.

[0084] (e) Ultraviolet scattering agent)

[0085] The cosmetic material of the present invention may further contain an ultraviolet scattering agent. The ultraviolet scattering agent functions to scatter or block ultraviolet rays.

[0086] Examples of ultraviolet scattering agents include, but are not limited to, titanium oxide, zinc oxide, cerium oxide, or powders of mixtures thereof. Furthermore, titanium oxide and zinc oxide can be, for example, particulate titanium oxide and zinc oxide with a particle size of 10–50 nm. Moreover, titanium oxide and zinc oxide can undergo surface treatment. Examples of surface treatments include, for example, fatty acid treatment and fatty acid ester treatment, but are not limited to these.

[0087] In addition, commercially available substances can be used as ultraviolet scattering agents.

[0088] In the cosmetics of the present invention, when the ultraviolet scattering agent is included, its content relative to the total amount of the cosmetics can be, for example, 1.0% or more by mass, 2.0% or more by mass, 3.0% or more by mass, 4.0% or more by mass, 5.0% or more by mass, or 6.0% or more by mass, and can also be 25% or less by mass, 20% or less by mass, 15% or less by mass, or 10% or less by mass.

[0089] (f) Film-forming agents)

[0090] The cosmetic material of the present invention may further include a film-forming agent. The film-forming agent can provide a makeup-holding effect.

[0091] Examples of film-forming agents include, but are not limited to, fluorinated silicone resins, trimethylsiloxysilicic acid, and acrylic silicone resins. Furthermore, the film-forming agent can be in solid form at 25°C, and in its solid form, it can be dissolved in a solvent for use.

[0092] In addition, commercially available substances can be used as film-forming agents. Examples of commercially available film-forming agents include, for example, the fluoroorganic silicone resin X66-C8636 ((trifluoroalkyl dimethyl / trimethylsiloxysilicate) / polydimethylsiloxane) manufactured by Modernite Powerworks Materia Medica Japan Co., Ltd., but it is not limited to this.

[0093] In the cosmetics of the present invention, when a film-forming agent is included, its content relative to the total amount of the cosmetic can be, for example, 0.1% by mass or more, 0.5% by mass or more, 1.0% by mass or more, 1.5% by mass or more, 2.0% by mass or more, 2.5% by mass or more, or 3.0% by mass or more; and can also be 10% by mass or less, 8% by mass or less, 6% by mass or less, or 4% by mass or less. Furthermore, when the film-forming agent is dissolved in a solvent, its content as a solid component can be within the above-mentioned ranges.

[0094] (surfactant)

[0095] Although the polyglycerol-modified organosilicon shown in formula (I) is a type of organosilicon surfactant that acts as a dispersant, the cosmetic of the present invention may further contain other surfactants, such as surfactants that act as emulsifiers, for example, organosilicon surfactants or nonionic surfactants such as polyglycerol fatty acid esters.

[0096] Here, examples of organosilicon surfactants other than the polyglycerol-modified organosilicon shown in formula (I) above include, for example, polyether-modified organosilicon with the polyether chain located on the side chain (hereinafter also simply referred to as "polyether-modified organosilicon"), or polyglycerol-modified organosilicon, but are not limited to these.

[0097] Examples of these surfactants include, but are not limited to, PEG-10 polydimethylsiloxane, PEG-9 polydimethylsiloxyethyl polydimethylsiloxane, and lauryl PEG-9 polydimethylsiloxyethyl polydimethylsiloxane, which are defined in cosmetic labeling.

[0098] In addition, commercially available products of these surfactants include KF-6017, KF-6028, and KF-6038 manufactured by Shin-Etsu Chemical Co., Ltd., but are not limited to these.

[0099] (Non-volatile silicone oil)

[0100] The cosmetics of the present invention may further contain oils other than the volatile silicone oils described above, such as non-volatile silicone oils. Examples of non-volatile silicone oils include commercially available silicone KF-96A-6T (polydimethylsiloxane) and other silicone oils other than the volatile silicone oils described above, but are not limited to these.

[0101] Furthermore, in cases where non-volatile silicone oil is included, its content relative to the total amount of cosmetics can be, for example, 1.0 to 10% by mass.

[0102] (Water-soluble components)

[0103] The cosmetics of the present invention may further contain water-soluble ingredients such as lower alcohols. Examples of lower alcohols include, but are not limited to, ethanol, propanol, butanol, pentanol, and hexanol.

[0104] Furthermore, when water-soluble ingredients are included, their content relative to the total amount of the cosmetic can be, for example, 1.0 to 10% by mass.

[0105] (UV absorber)

[0106] The cosmetic material of the present invention may further comprise a UV absorber. Examples of UV absorbers include, but are not limited to, benzoic acid derivatives, salicylic acid derivatives, cinnamic acid derivatives, dibenzoylmethane derivatives, β,β-diphenylacrylate derivatives, benzophenone derivatives, benzyl camphor derivatives, phenylbenzimidazole derivatives, triazine derivatives, phenylbenzotriazole derivatives, o-aminobenzoyl derivatives, imidazoline derivatives, benzylmalonate derivatives, and 4,4-diarylbutadiene derivatives.

[0107] Furthermore, in cases where ultraviolet absorbers are included, their content relative to the total amount of cosmetics can be, for example, 1.0 to 10% by mass.

[0108] (Coloring agent)

[0109] The cosmetic material of the present invention may further include a colorant. Examples of colorants include, but are not limited to, red pigments such as iron oxide red or iron titanate, yellow pigments such as iron oxide yellow or loess, black pigments such as iron oxide black, purple pigments such as manganese violet, green pigments such as chromium oxide, blue pigments such as navy blue, and substances obtained by mixing them.

[0110] Furthermore, in cases where colorants are included, their content relative to the total amount of cosmetics can be, for example, 0.001 to 10% by mass.

[0111] In addition to the above, as long as the effect of the present invention is not impaired, the cosmetics of the present invention may further include ingredients that can be used in conventional cosmetics, such as preservatives, thickeners, pH adjusters, fragrances, moisturizers, blood circulation promoters, cooling agents, antiperspirants, bactericides, or skin activators.

[0112] <form>

[0113] The cosmetic material of the present invention can be a redispersible cosmetic material that is agitated during use to redisperse it.

[0114] Furthermore, the cosmetic material of the present invention can be a water-in-oil type. Water-in-oil type cosmetic materials are preferred from the viewpoints of moisturizing and water resistance.

[0115] Here, the water-in-oil cosmetic can be manufactured using conventional methods. More specifically, the cosmetic of the present invention can be manufactured using the following steps: At a specified temperature of approximately 25°C, a powder phase (hydrophobic treated silica powder, and optionally added ultraviolet scattering agents, colorants, etc.) is added to a mixed oil phase component (volatile silicone oil, and optionally added film-forming agents, etc.) and dispersed. Then, an aqueous phase component (water, and optionally added water-soluble components) is added and stirred to obtain the water-in-oil cosmetic.

[0116] Furthermore, the cosmetic material of the present invention can be applied to lotions, base makeup, liquid foundations, sunscreens, and other cosmetic materials. Moreover, the cosmetic material of the present invention can be used both as a single product and in combination with powder cosmetic materials such as liquid foundations, pressed powders / puffs.

[0117] <Viscosity>

[0118] From the viewpoint of good spreadability and improved ease of application, the viscosity of the cosmetic material of the present invention can be, for example, 10000 mPa·s or less, or 8000 mPa·s or less. Furthermore, from the viewpoint of suppressing liquid dripping during application, it can be 100 mPa·s or more. In addition, in the present invention, the viscosity of the cosmetic material can be measured using, for example, a BL type viscometer (VS-A type, manufactured by Shibaura System Co., Ltd., 30°C) with rotor number 3 under measurement conditions of 12 rpm and 1 minute.

[0119] Example

[0120] The following examples illustrate the invention in further detail, but the invention is not limited thereto. Furthermore, unless otherwise specified, all contents are expressed in mass percent (%).

[0121] The cosmetics of the examples and comparative examples shown in Tables 1 and 2 below were prepared using conventional methods. The redispersibility of each of the resulting cosmetics was evaluated according to the following criteria. The results are shown in Table 1.

[0122] (Evaluation of redistribution)

[0123] The cosmetics from each embodiment and comparative example were evaluated for their condition after centrifugation using a Hitachi centrifuge (himac CF702). The evaluation criteria are as follows:

[0124] A: No particles settled during the 10 up-and-down oscillations.

[0125] B: After 10 up-and-down oscillations, some of the particles settled.

[0126] C: After 10 up-and-down oscillations, most of the particles (visually more than half) settled.

[0127] [Table 1]

[0128]

[0129] In addition, the “Other common components” in Table 1 are shown in Table 2 below.

[0130] [Table 2]

[0131] (Table 2: Details of other common components in the various embodiments and comparative examples)

[0132]

[0133] As can be clearly seen from Table 1, the cosmetics in Examples 1 to 3 all exhibit good redispersibility.

[0134] In contrast, it can be seen that Comparative Examples 1 to 7, which do not contain "bisbutylpolydimethylsiloxane polyglycerol-3", all exhibit poor redispersibility. Furthermore, in Comparative Examples 2 to 7, it can be seen that even when other surfactants are mixed in to replace "bisbutylpolydimethylsiloxane polyglycerol-3", the redispersibility cannot be improved.

[0135] Furthermore, in Comparative Example 8, it was found that "bisbutyl polydimethylsiloxane polyglycerol-3" was used instead of the hydrophobic treated silica powder of the present invention to disperse "organosilicon-treated titanium dioxide", resulting in poor redispersibility.

[0136] (Determination of the oil absorption capacity of oleic acid in hydrophobically treated silica powder)

[0137] The oil absorption of oleic acid was determined using the hydrophobic treated silica powder (organosilicon treated silica) used in the examples, with reference to "JIS-KJIS K 5101-13-1 Japanese Industrial Standard Pigment Test Method - Part 13: Oil Absorption - Section 1: Refined Linseed Oil Method".

[0138] More specifically, 100g of hydrophobically treated silica powder was measured, and oleic acid was used instead of refined flaxseed oil to determine the oil absorption of the hydrophobically treated silica powder.

[0139] The results of the measurements show that the oleic acid absorption of the hydrophobic treated silica powder used in the examples is 240-250 ml / 100g.

[0140] (Viscosity measurement)

[0141] The viscometers for the cosmetics in Examples 1-3 were measured using a BL type viscometer (VS-A type, manufactured by Shibaura System Co., Ltd., 30°C) with rotor No. 3 at 12 rpm for 1 minute. The results showed that the viscosity of all cosmetics in Examples 1-3 was 2000 mPa·s.

[0142] <Prescription Example>

[0143] The following are examples of formulations of cosmetic materials according to the present invention, but the present invention is not limited to these examples.

[0144] Prescription Example 1: Sunscreen

[0145] Ingredient content (mass%)

[0146] The remaining portion of water contains 6.0% ethanol.

[0147] 22% volatile polydimethylsiloxane

[0148] Non-volatile polydimethylsiloxane 4.0%

[0149] Diphenylsiloxyphenyl polytrimethylsiloxane 3.0%

[0150] (Trifluoroalkyl dimethyl / trimethylsiloxysilicate) / polydimethylsiloxane 2.6%

[0151] PEG-10 polydimethylsiloxane 0.9%

[0152] Dibutylpolydimethylsiloxane polyglycerol-3 1.0%

[0153] Ethylhexyl methoxycinnamate 5.0%

[0154] Diethylhexyloxyphenol methoxyphenyl triazine 0.5%

[0155] Fatty acid treatment of titanium dioxide 1.0%

[0156] Fatty acid esters treated zinc oxide 6.0%

[0157] Organosilicon-treated silica 5.0%

[0158] Polyhydroxybutyric acid 0.1%

[0159] Poly(3-hydroxybutyric acid-co-3-hydroxyvalerate) 0.1%

[0160] Phenoxyethanol 0.5%

[0161] Total 100%

[0162] Prescription Example 2: Sunscreen

[0163] Ingredient content (mass%)

[0164] Remaining water 6.0% ethanol Nicotinamide 5.0% 22% volatile polydimethylsiloxane Non-volatile polydimethylsiloxane 4.0% Diphenylsiloxyphenyl polytrimethylsiloxane 3.0% (Trifluoroalkyl dimethyl / trimethylsiloxysilicate) / polydimethylsiloxane 2.6% PEG-10 polydimethylsiloxane 0.9% Dibutylpolydimethylsiloxane polyglycerol-3 1.0% Ethylhexyl methoxycinnamate 5.0% Diethylhexyloxyphenol methoxyphenyl triazine 0.5% Fatty acid treatment of titanium dioxide 1.0% Fatty acid esters treated zinc oxide 6.0% Organosilicon-treated silica 5.0% Polyhydroxybutyric acid 0.1% Poly(3-hydroxybutyric acid-co-3-hydroxyvalerate) 0.1% Phenoxyethanol 0.5% Total 100%.

Claims

1. A liquid oil-based cosmetic comprising the following ingredients (a) to (c): (a) Volatile silicone oil 5.0–60% by mass; (b) 3.0–10% by mass of hydrophobically treated silica powder. (c) 0.05 to 5.0% by weight of bisbutyl polydimethylsiloxane polyglycerol-3.

2. The cosmetic according to claim 1, wherein the oleic acid in the hydrophobic treated silica powder has an oil absorption capacity of 1.0 ml / g or more.

3. The cosmetic according to claim 1 or 2, wherein the volatile silicone oil is a linear polydimethylsiloxane.

4. The cosmetic according to claim 1 or 2, further comprising (e) an ultraviolet scattering agent.

5. The cosmetic according to claim 1 or 2, further comprising (f) a film-forming agent.

6. The cosmetic product according to claim 1 or 2 is an oil-in-water type.

7. The cosmetic according to claim 1 or 2, wherein the hydrophobic silica powder is silica powder that has undergone organosilicon treatment.

8. The cosmetic according to claim 1 or 2, wherein it is a redispersible cosmetic that is redispersed by agitation during use.

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