Powdered solid cosmetic

Abstract

Provided is a powdered solid cosmetic that has improved dispersibility of surface-treated pigment particles and is excellent in spreadability during use.　The powdered solid cosmetic contains: pigment particles that have been surface-treated using an ester compound of a C8-20 fatty acid and glycerin; an extender pigment; and an oil component containing at least one oil selected from the group consisting of ester oils and hydrocarbon oils.

Description

Powdered solid cosmetics

[0001] The present invention relates to a solid cosmetic product in powder form.

[0002] Known cosmetics containing surface-treated pigment particles include makeup cosmetics such as a makeup base, foundation, powder, blush, eye shadow, lipstick, eyeliner, or eyebrow pencil, and skin care cosmetics such as whitening cosmetics or UV care cosmetics.

[0003] As an example of surface-treated pigment particles used in such cosmetics, Patent Document 1 discloses a powder material for cosmetics that includes a powder for cosmetics that has been surface-treated with an ester compound of a fatty acid having 8 to 20 carbon atoms and glycerin.

[0004] International Publication No. 2022 / 030462

[0005] However, through intensive research by the present inventors, it was found that when a solid cosmetic powder preparation was prepared by blending pigment particles that had been surface-treated with an ester compound as disclosed in Patent Document 1, the cosmetic preparation sometimes had poor spreadability when used.

[0006] On the other hand, for example, in the case of an oil-based solid cosmetic, that is, when the continuous phase is an oil, the dispersibility of pigment particles surface-treated with the above-mentioned ester compounds did not change significantly depending on the combination with the oil (see Reference Examples 1-1 to 1-3 described below).

[0007] The present invention seeks to improve the above-mentioned circumstances, and its object is to provide a solid cosmetic in powder form that contains surface-treated pigment particles with improved dispersibility and that has excellent spreadability during use.

[0008] The present invention that achieves the above object is as follows.

[0009] Aspect 1: A solid cosmetic preparation in powder form comprising pigment particles surface-treated with an ester compound of a fatty acid having 8 to 20 carbon atoms and glycerin, an extender pigment, and an oil component comprising at least one selected from the group consisting of ester oils and hydrocarbon oils. Aspect 2: The solid cosmetic preparation in powder form according to Aspect 1, wherein the ester compound is at least one selected from the group consisting of diglyceryl tetraisostearate, diglyceryl triisostearate, caprylic / capric triglyceride, glyceryl dilaurate, glyceryl triisostearate, decaglyceryl monoisostearate, and decaglyceryl diisostearate. Aspect 3: The solid cosmetic preparation in powder form according to Aspect 1 or 2, wherein the pigment particles comprise at least one selected from the group consisting of titanium oxide, yellow iron oxide, red iron oxide, black iron oxide, and zinc oxide. Aspect 4: The cosmetic preparation in powder form according to any one of Aspects 1 to 3, wherein the body pigment comprises at least one selected from the group consisting of talc, mica, kaolin, sericite, silica, boron nitride, bismuth oxychloride, cellulose, and barium sulfate. Aspect 5: The cosmetic preparation in powder form according to any one of Aspects 1 to 4, wherein the oil content is 5.0 to 20% by mass. Aspect 6: The cosmetic preparation in powder form according to any one of Aspects 1 to 5, wherein the pigment particles surface-treated with the ester compound are contained in an amount of 0.01 to 30% by mass. Aspect 7: The cosmetic preparation in powder form according to any one of Aspects 1 to 6, wherein the body pigment content is 20 to 80% by mass. Aspect 8: The cosmetic preparation in powder form according to any one of Aspects 1 to 7, wherein the oil content comprises the ester oil. Aspect 9: The solid cosmetic preparation in powder form according to any one of Aspects 1 to 8, which is a powdery foundation, face powder, eye shadow, blush, highlighter, or bronzer.

[0010] According to the present invention, it is possible to provide a solid cosmetic in powder form that has improved dispersibility of the surface-treated pigment particles contained therein and that has excellent spreadability during use.

[0011] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the preferred embodiments. However, the present invention is not limited to the following embodiments, and various modifications can be made within the scope of the present invention.

[0012] <<Solid Cosmetic in Powder>> The solid cosmetic in powder of the present invention (hereinafter also simply referred to as "the cosmetic of the present invention") is a solid cosmetic in powder form comprising pigment particles that have been surface-treated with an ester compound of a fatty acid having 8 to 20 carbon atoms and glycerin, an extender pigment, and an oil component that includes at least one selected from the group consisting of ester oils and hydrocarbon oils.

[0013] As mentioned above, through extensive research by the present inventors, it was found that in the case of solid cosmetic powders, when pigment particles surface-treated with an ester compound as disclosed in Patent Document 1 are blended, the cosmetic may not spread well when used. This is thought to be because the continuous phase of solid cosmetic powders is an air phase, making it difficult to disperse the surface-treated pigment particles and the extender pigment well in the presence of oil.

[0014] In response to this, the present inventors, through further intensive research, have found that by using a specific oil in combination with pigment particles that have been surface-treated with such an ester compound (hereinafter also referred to as "the ester compound according to the present invention") in a solid cosmetic powder, it is possible to improve the dispersibility of the pigment particles, and as a result, to obtain a cosmetic of the present invention that has excellent spreadability upon application. Without being limited by theory, it is presumed that this is due to the following reasons.

[0015] That is, in the case of a powder solid cosmetic product, i.e., when the continuous phase is an air phase, if the compatibility between the oil and the surface-treated pigment particles is poor, the oil is likely to clump. As a result, it is believed that the surface-treated pigment particles also tend to clump. In contrast, the specific oil used in the cosmetic product of the present invention is relatively compatible with the surface treatment agent for the pigment particles of the present invention (i.e., the ester compound of the present invention), meaning that the surface-treated pigment particles of the present invention are likely to adsorb the oil. This is believed to suppress the occurrence of oil clumping and improve the mutual dispersibility of the pigment particles surface-treated with the ester compound of the present invention and the extender pigment in the presence of the oil.

[0016] In the present invention, a solid cosmetic in powder form refers to a cosmetic in which the air phase is the continuous phase and the powder is solidified with oil, resulting in a solid overall form. Therefore, in the solid cosmetic in powder form of the present invention, the powder constitutes the major portion of the entire composition. For example, in the solid cosmetic in powder form of the present invention, the total content of the pigment particles surface-treated with an ester compound and the extender pigment may be more than 50% by mass, 55% by mass or more, 60% by mass or more, 65% by mass or more, 70% by mass or more, 75% by mass or more, 80% by mass or more, or 90% by mass or more of the entire cosmetic. Furthermore, this total amount may be 95% by mass or less, 90% by mass or less, or 80% by mass or less.

[0017] Each component that can be contained in the cosmetic composition of the present invention will be described in detail below.

[0018] <Surface-treated pigment particles> The cosmetic of the present invention contains one or more types of surface-treated pigment particles. Here, the surface-treated pigment particles are those that have been surface-treated with the ester compound of the present invention.

[0019] In the cosmetic of the present invention, the content of the surface-treated pigment particles is not particularly limited, and may be adjusted, for example, as follows.

[0020] For example, relative to the total amount of the cosmetic of the present invention, the content of the surface-treated pigment particles may be, for example, 0.01% by mass or more, 0.05% by mass or more, 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, 8.0% by mass or more, 8.5% by mass or more, 9.0% by mass or more, 9.5% by mass or more, or 10% by mass or more, and may be 30% by mass or less, 25% by mass or less, 20% by mass or less, 15% by mass or less, 10% by mass or less, or 5.0% by mass or less.

[0021] Furthermore, for example, the amount of the surface-treated pigment particles relative to 100 parts by mass of the extender pigment may be, for example, 0.5 parts by mass or more, 1.0 parts by mass or more, 1.5 parts by mass or more, 2.0 parts by mass or more, 2.5 parts by mass or more, 3.0 parts by mass or more, 3.5 parts by mass or more, 4.0 parts by mass or more, 4.5 parts by mass or more, 5.0 parts by mass or more, 5.5 parts by mass or more, 6.0 parts by mass or more, 6.5 parts by mass or more, 7.0 parts by mass or more, 7.5 parts by mass or more, 8.0 parts by mass or more, 8.5 parts by mass or more, 9.0 parts by mass or more, 9.5 parts by mass or more, 10 parts by mass or more, 15 parts by mass or more, or 20 parts by mass or more, and may be 30 parts by mass or less, 25 parts by mass or less, 20 parts by mass or less, 15 parts by mass or less, or 10 parts by mass or less. In particular, from the viewpoint of using the cosmetic of the present invention as a face powder, the amount of the surface-treated pigment particles is preferably 0.5 parts by mass or more relative to 100 parts by mass of the body pigment. Furthermore, from the viewpoint of using the cosmetic of the present invention as a powdery foundation, the amount of the surface-treated pigment particles is preferably 30 parts by mass or less relative to 100 parts by mass of the body pigment.

[0022] Furthermore, for example, the amount of the surface-treated pigment particles relative to 100 parts by mass of oil is, for example, 1.0 parts by mass or more, 1.2 parts by mass or more, 1.5 parts by mass or more, 2.0 parts by mass or more, 2.5 parts by mass or more, 3.0 parts by mass or more, 3.5 parts by mass or more, 4.0 parts by mass or more, 4.5 parts by mass or more, 5.0 parts by mass or more, 5.5 parts by mass or more, 6.0 parts by mass or more, 6.5 parts by mass or more, 7.0 parts by mass or more, 7.5 parts by mass or more, 8.0 parts by mass or more, 8.5 parts by mass or more, 9.0 parts by mass or more, 9. The amount may be 5 parts by mass or more, 10 parts by mass or more, 15 parts by mass or more, 20 parts by mass or more, 30 parts by mass or more, 40 parts by mass or more, 50 parts by mass or more, or 60 parts by mass or more, and may be 80 parts by mass or less, 75 parts by mass or less, 70 parts by mass or less, 65 parts by mass or less, 60 parts by mass or less, 55 parts by mass or less, 50 parts by mass or less, 45 parts by mass or less, 40 parts by mass or less, 35 parts by mass or less, 30 parts by mass or less, 25 parts by mass or less, 20 parts by mass or less, 15 parts by mass or less, or 10 parts by mass or less. Furthermore, particularly from the viewpoint of using the cosmetic of the present invention as a face powder, it is preferable that the amount of the surface-treated pigment particles be 1.2 parts by mass or more per 100 parts by mass of oil. Furthermore, from the viewpoint of using the cosmetic of the present invention as a powdery foundation, it is preferable that the amount of the surface-treated pigment particles be 80 parts or less per 100 parts by mass of oil.

[0023] The ester compound according to the present invention is not particularly limited, and is preferably one that does not color or is unlikely to color the pigment particles that are the subject of surface treatment.

[0024] Specifically, the fatty acid having 8 to 20 carbon atoms in the ester compound according to the present invention may be, for example, a fatty acid having 8 or more, 10 or more, 12 or more, 14 or more, 16 or more, or 18 or more carbon atoms, or a fatty acid having 20 or less, 19 or less, or 18 or less carbon atoms. Of these, fatty acids having 8 to 18 carbon atoms are preferred, and fatty acids having 12 to 18 carbon atoms are more preferred. Furthermore, such fatty acids may be branched or linear.

[0025] Furthermore, the glycerin in the ester compound according to the present invention may be either unpolymerized (i.e., a monomer) monoglycerin or polymerized (i.e., a polymer) polyglycerin. When polyglycerin is used, its degree of polymerization is not particularly limited, but is preferably 2 or more and 10 or less. As the glycerin, monoglycerin, which is a monomer, diglycerin having a degree of polymerization of 2, or decaglycerin having a degree of polymerization of 10 is preferred, and diglycerin having a degree of polymerization of 2 is more preferred.

[0026] The ester compound according to the present invention may contain, for example, at least one selected from the group consisting of diglyceryl tetraisostearate, diglyceryl triisostearate, diglyceryl diisostearate, diglyceryl monoisostearate, caprylic / capric triglyceride, glyceryl triethylhexanoate, glyceryl dilaurate, glyceryl triisostearate, decaglyceryl monoisostearate, and decaglyceryl diisostearate. Among these, for example, from the viewpoint of improving the lipophilicity of the surface-treated pigment particles and from the viewpoint of being a naturally-derived material, the ester compound according to the present invention is preferably, for example, diglyceryl tetraisostearate, diglyceryl triisostearate, glyceryl dilaurate, glyceryl triisostearate, decaglyceryl monoisostearate, or decaglyceryl diisostearate, with diglyceryl tetraisostearate being more preferred.

[0027] The method for surface treatment of pigment particles using the ester compound according to the present invention is not particularly limited, and for example, the "Method for producing powder materials for cosmetics" disclosed in Patent Document 1 may be referred to as appropriate.

[0028] In the present invention, any pigment particles can be used as the pigment particles to be surface treated, regardless of their shape (spherical, rod-like, needle-like, plate-like, irregular, scaly, spindle-like, etc.), particle size (aerosol-like, fine particles, pigment-grade, etc.), or particle structure (porous, non-porous, etc.). Examples of pigment particles that can be used include, but are not limited to, inorganic pigment powders (including natural mineral pigments or synthetic inorganic pigments, etc.), organic colorants, and organic pigment powders.

[0029] In the present invention, the pigment particles subjected to surface treatment are used for coloring purposes and refer to particles capable of producing colors such as red, blue, green, yellow, brown, black, and white. For example, pigment particles include red iron oxide, zinc oxide, ultramarine, ferric iron oxide, verdigris, titanium dioxide, and carbon black. In contrast, the term "extender pigment" as used herein refers to a substance other than the pigment particles of the present invention that does not possess coloring power or hiding power by itself. For example, mica, sericite, talc, and the like can be classified as extender pigments. Furthermore, in cosmetics, extender pigments are often incorporated for the purpose of, for example, acting as an extender, or for adjusting fluidity, strength, gloss, viscosity, adhesion, etc., or for reinforcing purposes.

[0030] More specifically, inorganic pigments are not particularly limited, and examples thereof include white inorganic pigments, black inorganic pigments, red inorganic pigments, yellow inorganic pigments, green inorganic pigments, blue inorganic pigments, and purple inorganic pigments. White inorganic pigments include, but are not limited to, titanium oxide and zinc oxide. Black inorganic pigments include, but are not limited to, black iron oxide and carbon. Red inorganic pigments include, but are not limited to, red iron oxide and red iron oxide. Yellow inorganic pigments include, but are not limited to, yellow iron oxide. Green inorganic pigments include, but are not limited to, chromium oxide, chromium hydroxide, and cobalt titanate. Blue inorganic pigments include, but are not limited to, ultramarine and Prussian blue. Purple inorganic pigments include, but are not limited to, mango violet and cobalt violet.

[0031] Examples of organic dyes include, but are not limited to, Red No. 3, Red No. 10, Red No. 106, Red No. 201, Red No. 202, Red No. 204, Red No. 205, Red No. 220, Red No. 226, Red No. 227, Red No. 228, Red No. 230, Red No. 401, Red No. 405, Red No. 505, Yellow No. 4, Yellow No. 5, Yellow No. 202, Yellow No. 203, Yellow No. 205, Yellow No. 401, Orange No. 201, Orange No. 203, Orange No. 204, Orange No. 205, Orange No. 206, Orange No. 207, Blue No. 1, Blue No. 2, Blue No. 201, Blue 404, Green No. 3, Green No. 201, Green No. 204, and Green No. 205.

[0032] Examples of organic pigment powders include, but are not limited to, tar pigments, nylon powder, cellulose powder, polyethylene powder, polymethyl methacrylate powder, polystyrene powder, acrylic powder, and silicone powder.

[0033] In one embodiment, the pigment particles according to the present invention may comprise at least one selected from the group consisting of titanium oxide, yellow iron oxide, red iron oxide, black iron oxide, and zinc oxide.

[0034] <Extender Pigment> The cosmetic of the present invention contains one or more extender pigments.

[0035] Extender pigments can function as fillers in cosmetics. More specifically, for example, by blending extender pigments, it is possible to increase the amount of powder components or dilute the coloring material (pigment particles). Furthermore, when blending multiple types of extender pigments, adjusting the blending ratio can change the appearance impression after application of the cosmetic and the feel of the cosmetic.

[0036] In the cosmetic of the present invention, the content of the extender pigment is not particularly limited, and may be adjusted, for example, as follows.

[0037] For example, relative to the total amount of the cosmetic of the present invention, the amount of the extender pigment may be, for example, 20% by mass or more, 25% by mass or more, 30% by mass or more, 35% by mass or more, 40% by mass or more, 45% by mass or more, 50% by mass or more, 55% by mass or more, 60% by mass or more, 65% by mass or more, or 70% by mass or more, and may be 80% by mass or less, 79% by mass or less, 78% by mass or less, 77% by mass or less, 76% by mass or less, 75% by mass or less, 74% by mass or less, 73% by mass or less, 72% by mass or less, 71% by mass or less, or 70% by mass or less.

[0038] Furthermore, for example, the amount of the extender pigment per 100 parts by mass of oil may be, for example, 55 parts by mass or more, 56 parts by mass or more, 80 parts by mass or more, 100 parts by mass or more, 150 parts by mass or more, 200 parts by mass or more, 250 parts by mass or more, 300 parts by mass or more, 350 parts by mass or more, 400 parts by mass or more, 450 parts by mass or more, 500 parts by mass or more, 550 parts by mass or more, 600 parts by mass or more, 650 parts by mass or more, 700 parts by mass or more, or 750 parts by mass or more, and may be 1300 parts by mass or less, 1000 parts by mass or less, or 800 parts by mass or less. Furthermore, particularly from the viewpoint of using the cosmetic of the present invention as a powdery foundation, it is preferable that the amount of the extender pigment be 56 parts by mass or more per 100 parts by mass of oil. Furthermore, from the viewpoint of using the cosmetic of the present invention as a face powder, the amount of the extender pigment is preferably 1,300 parts by mass or less per 100 parts by mass of the oil content.

[0039] In the cosmetic of the present invention, the extender pigment is not particularly limited, and may be, for example, an inorganic powder, a ground product of a naturally occurring clay mineral, or a synthetic powder.

[0040] More specifically, the extender pigment may contain at least one selected from the group consisting of talc, mica, kaolin, sericite, silica, boron nitride, bismuth oxychloride, cellulose, and barium sulfate. Among these, from the viewpoint of improving usability and impact resistance, the extender pigment preferably contains talc and / or mica.

[0041] In the present invention, the extender pigment may be surface-treated or untreated. Examples of surface treatments include hydrophobic treatments such as fluorine compound treatment, silicone treatment, silicone resin treatment, pendant treatment, silane coupling agent treatment, titanium coupling agent treatment, oil treatment, N-acylated lysine treatment, polyacrylic acid treatment, metal soap treatment, dextrin fatty acid ester treatment, amino acid treatment, inorganic compound treatment, plasma treatment, mechanochemical treatment, silane compound treatment, and silazane compound treatment, but are not limited to these.

[0042] <Oil> The cosmetic composition of the present invention contains one or more types of oil.

[0043] The content of the oil is not particularly limited and may be adjusted appropriately depending on the intended use of the cosmetic, etc. For example, relative to the total amount of the cosmetic of the present invention, the oil content may 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, or 15% by mass or more, or may be 20% by mass or less, 19% by mass or less, 18% by mass or less, 17% by mass or less, 16% by mass or less, 15% by mass or less, 14% by mass or less, 13% by mass or less, 12% by mass or less, 11% by mass or less, or 10% by mass or less.

[0044] In the present invention, the oil component includes at least one selected from the group consisting of ester oils and hydrocarbon oils. Of these, oil components that are liquid at 25° C. are particularly preferred. Furthermore, from the viewpoint of improving compatibility with pigment particles that have been surface-treated with the above-described ester compound of the present invention, the oil component preferably includes an ester oil.

[0045] (Ester Oil) In the present invention, the ester oil refers to an oil component having an ester bond, and may be, for example, an ester oil obtained by a dehydration reaction between a carboxylic acid (including a fatty acid) and an alcohol (including a lower to higher alcohol). The ester oil is not particularly limited, and may be, for example, a polar oil or a triglyceride.

[0046] The term "polar oil" refers to an oil with a high polarity among oils that can be used in cosmetics, and may refer to, for example, an oil with an IOB value of 0.10 or more. The IOB value of the polar oil according to the present invention is not particularly limited, and may be, for example, 0.10 or more, 0.11 or more, 0.12 or more, 0.13 or more, 0.14 or more, 0.15 or more, 0.16 or more, 0.17 or more, 0.18 or more, 0.19 or more, 0.20 or more, or 0.25 or more. The upper limit of the IOB value of the polar oil according to the present invention is not particularly limited. For example, the IOB value of the polar oil is preferably 0.50 or less, and more specifically, the IOB value may be, for example, 0.49 or less, 0.45 or less, 0.40 or less, 0.35 or less, or 0.30 or less.

[0047] Here, the IOB value is an abbreviation for Inorganic / Organic Balance (Inorganic / Organic Ratio), and is a value that represents the ratio of inorganic value to organic value, and is an index that indicates the degree of polarity of an organic compound. Specifically, the IOB value is expressed as IOB value = inorganic value / organic value. For each of the "inorganic value" and "organic value," "inorganic value" and "organic value" are set according to various atoms or functional groups, for example, an "organic value" of 20 for one carbon atom in a molecule and an "inorganic value" of 100 for one hydroxyl group. The IOB value of an organic compound can be calculated by adding up the "inorganic value" and "organic value" of all atoms and functional groups in the organic compound (see, for example, Yoshio Koda, "Organic Conceptual Diagram - Fundamentals and Applications," pp. 11-17, Sankyo Publishing, 1984).

[0048] In the present invention, the IOB value of a triglyceride can also be determined. For example, the IOB value of a triglyceride according to the present invention may be 0.10 or more, 0.11 or more, 0.12 or more, 0.13 or more, 0.14 or more, 0.15 or more, 0.16 or more, 0.17 or more, 0.18 or more, 0.19 or more, 0.20 or more, or 0.25 or more, and may be 0.50 or less, 0.45 or less, 0.40 or less, 0.35 or less, or 0.30 or less.

[0049] Furthermore, from the viewpoint of further improving compatibility with pigment particles surface-treated with the above-described ester compound of the present invention, the ester oil is preferably an ester of a fatty acid having 2 to 8 carbon atoms and a monohydric to trihydric alcohol having 8 to 20 carbon atoms. Specifically, the fatty acid having 2 to 8 carbon atoms constituting the ester oil may be, for example, a fatty acid having 2 or more, 3 or more, or 4 or more carbon atoms, or a fatty acid having 8 or less, 7 or less, 6 or less, 5 or less, or 4 or less carbon atoms. Of these, fatty acids having 2 to 6 carbon atoms are preferred, and fatty acids having 4 to 6 carbon atoms are more preferred. Furthermore, such fatty acids may be branched or linear. Specifically, the alcohol constituting the ester oil may be, for example, an alcohol having 8 or more, 10 or more, 12 or more, 14 or more, 16 or more, or 18 or more carbon atoms, or an alcohol having 20 or less, or 18 or less carbon atoms. The valence of the alcohol may be, for example, monohydric, dihydric, or trihydric.

[0050] More specifically, examples of the ester oil include diisostearyl malate, isopropyl myristate, cetyl octanoate, octyldodecyl myristate, isopropyl palmitate, butyl stearate, hexyl laurate, myristyl myristate, decyl oleate, hexyldecyl dimethyloctanoate, cetyl lactate, myristyl lactate, lanolin acetate, isocetyl stearate, isocetyl isostearate, cholesteryl 12-hydroxystearate, ethylene glycol di-2-ethylhexanoate, dipentaerythritol fatty acid esters, N-alkyl glycol monoisostearate, neopentyl glycol dicaprate, glycerin di-2-heptylundecanoate, trimethylolpropane tri-2-ethylhexanoate, trimethylolpropane triisostearate, pentaerythritol tetra-2-ethylhexanoate, glycerin tri-2-ethylhexanoate, trimethylol triisostearate, propane, cetyl 2-ethylhexanoate, 2-ethylhexyl palmitate, glycerin trimyristate, tri-2-heptylundecanoic acid glyceride, castor oil fatty acid methyl ester, oleyl oleate, acetoglyceride, 2-heptylundecyl palmitate, diisobutyl adipate, N-lauroyl-L-glutamic acid-2-octyldodecyl ester, di-2-heptylundecyl adipate, ethyl laurate, di-2-ethyl sebacate Examples of ester oils include, but are not limited to, hexyl, 2-hexyldecyl myristate, 2-hexyldecyl palmitate, 2-hexyldecyl adipate, diisopropyl sebacate, isodecyl pivalate, 2-ethylhexyl succinate, ethyl acetate, butyl acetate, triethyl citrate, triethylhexanoin, glyceryl tricaprylate, glyceryl triisostearate, glyceryl tri(caprylic / capric acid), castor oil, and macadamia nut oil. Of these, preferred ester oils include, for example, diisostearyl malate and castor oil.

[0051] In the composition of the present invention, the content of the ester oil is not particularly limited, and may be, for example, 0.1 mass% or more, 1.0 mass% or more, 5.0 mass% or more, 10 mass% or more, 15 mass% or more, 20 mass% or more, 25 mass% or more, 30 mass% or more, 35 mass% or more, 40 mass% or more, 45 mass% or more, 50 mass% or more, 55 mass% or more, 60 mass% or more, 65 mass% or more, 70 mass% or more, 75 mass% or more, 80 mass% or more, 85 mass% or more, 90 mass% or more, 95 mass% or more, or 100 mass% (in this case, the oil is ester oil) relative to the entire oil content (total oil content), or 100 mass% or less, 90 mass% or less, 80 mass% or less, 70 mass% or less, 60 mass% or less, or 55 mass% or less. In particular, in the composition of the present invention, it is preferable that 80 mass% or more of the total oil content is constituted by ester oil.

[0052] (Hydrocarbon Oil) In the present invention, the hydrocarbon oil refers to a hydrocarbon oil other than the above-mentioned ester oil.

[0053] In the present invention, the hydrocarbon oil may be a volatile hydrocarbon oil or a non-volatile hydrocarbon oil.

[0054] In this specification, "non-volatile" oil means that the volatile content is 5% or less when left at atmospheric pressure and 105°C for 3 hours. Here, "volatile content" refers to the weight change rate (rate of loss due to volatilization) measured by a gravimetric method after placing filter paper on a glass petri dish and dropping about 0.2 g of sample (oil) on it. In contrast, a volatile content of more than 5% measured under similar conditions is considered "volatile."

[0055] More specifically, examples of hydrocarbon oils include, but are not limited to, liquid paraffin, hydrogenated polydecene, squalane, pristane, paraffin, squalene, α-olefin oligomer, isododecane, isohexadecane, and light isoparaffin.

[0056] Furthermore, in the composition of the present invention, the content of the hydrocarbon oil is not particularly limited, and may be, for example, 0.1% by mass or more, 1.0% by mass or more, 5.0% by mass or more, 10% by mass or more, 15% by mass or more, 20% by mass or more, 25% by mass or more, 30% by mass or more, 35% by mass or more, 40% by mass or more, 45% by mass or more, 50% by mass or more, 55% by mass or more, 60% by mass or more, 65% by mass or more, 70% by mass or more, 75% by mass or more, 80% by mass or more, 85% by mass or more, 90% by mass or more, 95% by mass or more, or 100% by mass (in this case, the oil content is an ester oil), or 100% by mass or less, 90% by mass or less, 80% by mass or less, 70% by mass or less, 60% by mass or less, or 55% by mass or less, relative to the total oil content.

[0057] (Other Oils) In the present invention, the oil may further contain other oils in addition to the above-mentioned ester oil and hydrocarbon oil, as long as the effects of the present invention are not impaired. Specific examples of other oils include, but are not limited to, silicone oil.

[0058] The silicone oil may be a volatile silicone oil or a non-volatile silicone oil, and may also be an acyclic silicone oil (e.g., a linear silicone oil or a branched silicone oil) or a cyclic silicone oil.

[0059] Specific examples of silicone oils include, but are not limited to, acyclic silicone oils such as polydimethylsiloxane (also known as "dimethicone"), methylphenylpolysiloxane, and methylhydrogenpolysiloxane; cyclic silicone oils such as octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, and dodecamethylcyclohexasiloxane; and mixtures of two or more thereof.

[0060] In the present invention, when the oil component contains other oil components, the content of the other oil components may be, for example, 0.1 parts by mass or more, 1.0 parts by mass or more, 5.0 parts by mass or more, 10 parts by mass or more, 15 parts by mass or more, or 20 parts by mass or more relative to 100 parts by mass of the total of the ester oil, hydrocarbon oil, and other oil components, and may be 50 parts by mass or less, 45 parts by mass or less, 40 parts by mass or less, 35 parts by mass or less, 30 parts by mass or less, 25 parts by mass or less, 20 parts by mass or less, 15 parts by mass or less, 10 parts by mass or less, 5.0 parts by mass or less, or 1.0 part by mass or less.

[0061] <Other Components> In addition to the components described above, the cosmetic of the present invention may optionally contain other components that can be used in solid powder cosmetics, as long as the effects of the present invention are not impaired. Examples of other components include, but are not limited to, other powders (powders other than the surface-treated pigment particles and extender pigments described above), ultraviolet absorbers, ultraviolet scattering agent particles, solid or semi-solid oily components other than the oils described above, surfactants, moisturizers, thickeners, fragrances, antioxidants, and various drugs.

[0062] For example, the other powders are not particularly limited and include, for example, functional powders. Specifically, for example, spherical inorganic powders can be further used as the other powders. Examples of inorganic spherical powders include silica, more specifically, colloidal silica, precipitated silica, fumed silica, calcined silica, fused silica, etc., but are not limited to these. By incorporating such inorganic powders, especially silica, into a powder solid cosmetic product, a smooth feeling similar to that obtained when using loose powder can be obtained.

[0063] When such other powders are further contained, their content is not particularly limited and may be, for example, 5.0% by mass or more, 10% by mass or more, or 15% by mass or more, and may be 30% by mass or less, 25% by mass or less, or 20% by mass or less, relative to the total amount of the cosmetic.

[0064] <Method for producing the cosmetic of the present invention> The cosmetic of the present invention is not particularly limited and can be produced, for example, by a method conventionally used for producing solid cosmetics in powder form. For example, either dry molding, in which the powder component and oil component are mixed without adding a solvent, filled into a container, and pressure-molded, or wet molding, in which a volatile dispersion medium is added to the powder component and oil component to form a slurry, filled into a container in the slurry state, and solidified by removing the solvent by vacuum suction or the like, may be used.

[0065] <Uses> The cosmetic of the present invention has improved dispersibility of the surface-treated pigment particles and excellent spreadability upon use, and therefore can be suitably used as a variety of makeup cosmetics and base makeup cosmetics.

[0066] Thus, the cosmetic of the present invention may be, for example, a powdery foundation, a face powder, an eye shadow, a blush, a highlighter, or a bronzer.

[0067] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these. Unless otherwise specified, the blending amounts are expressed in mass %.

[0068] Examples 1 and 2, and Comparative Examples 1 and 2: Solid cosmetic powder preparations of Examples 1 and 2, and Comparative Examples 1 and 2, were prepared based on the formulations in Table 1. The degree of spreadability of each of the resulting cosmetic preparations upon use was evaluated according to the following criteria. The evaluation results are shown in Table 1.

[0069] <Evaluation of Spreadability> Cosmetics were applied to the inner arm of the subject and visually observed. "A": The cosmetic was applied heavily and spread very well; "B": The cosmetic was applied heavily and spread well; "C": The cosmetic was applied lightly but spread well; "D": The cosmetic was applied lightly and spread poorly; "E": The cosmetic was not applied and did not spread well.

[0070] The excellent spreadability of the cosmetic is believed to be the result of the improved dispersibility of the surface-treated pigment particles.

[0071]

[0072] As is clear from the results in Table 1, the cosmetics of Examples 1 and 2 were found to have better adhesion and better spreadability upon use than the cosmetics of Comparative Examples 1 and 2. In particular, Example 1 was found to be the most excellent in the evaluation of spreadability upon use.

[0073] Example 3 and Comparative Examples 3 and 4 Solid cosmetic powder preparations of Example 3 and Comparative Examples 3 and 4 were prepared based on the formulations in Table 2. The degree of spreadability of each of the resulting cosmetic preparations upon use was evaluated in the same manner as above. The evaluation results are shown in Table 2.

[0074] As is clear from the results in Table 2, the cosmetic of Example 3 was found to be superior to the cosmetic of Comparative Examples 3 and 4 in terms of spreadability during use.

[0075] Reference Examples 1-1 to 1-3 Oil-based solid cosmetics of Reference Examples 1-1 to 1-3 were prepared based on the formulations in Table 3. The dispersibility of the pigment particles in each of the obtained cosmetics was evaluated according to the following criteria. The evaluation results are shown in Table 3. <Evaluation of Dispersibility of Pigment Particles> The cosmetics were applied to the inner arm of the subject and observed visually. "Good": The cosmetic spreads well and evenly; "Poor": The cosmetic spreads poorly and is uneven.

[0076]

[0077] As is clear from the results in Table 3, the cosmetics of Reference Examples 1-1 to 1-3 all showed good dispersibility of the surface-treated pigment particles. This suggests that in the case of oil-based solid cosmetics, the dispersibility of the surface-treated pigment particles does not change significantly depending on the combination with an oil component.

[0078] Reference Examples 2-1 to 2-3 Loose powder cosmetics (powder cosmetics, but not solid) of Reference Examples 2-1 to 2-3 were prepared based on the formulations in Table 4. The dispersibility of the pigment particles in each of the obtained cosmetics was evaluated in the same manner as above. The evaluation results are shown in Table 4.

[0079]

[0080] As is clear from the results in Table 4, the dispersibility of the surface-treated pigment particles was found to be good in all of the cosmetics of Reference Examples 2-1 to 2-3. This suggests that in the case of loose powder, the dispersibility of the surface-treated pigment particles does not change significantly depending on the combination with oil.

[0081] Examples 4 to 10 and Comparative Examples 5 to 7 Solid cosmetic powder preparations of Examples 4 to 10 and Comparative Examples 5 to 7 were prepared based on the formulations in Table 5. The degree of spreadability during use of each of the obtained cosmetic preparations was evaluated in the same manner as described above. The evaluation results are shown in Table 5.

[0082]

[0083] As is clear from the results in Table 5, the cosmetics of Examples 4 to 10 were found to be superior in spreadability during use compared to the cosmetics of Comparative Examples 5 to 7.

Claims

1. A powdered solid cosmetic comprising pigment particles surface-treated with an ester compound of a fatty acid having 8 to 20 carbon atoms and glycerin, an extender pigment, and an oil component containing at least one selected from the group consisting of ester oils and hydrocarbon oils.

2. The solid cosmetic preparation in powder form according to claim 1, wherein the ester compound is at least one selected from the group consisting of diglyceryl tetraisostearate, diglyceryl triisostearate, caprylic / capric triglyceride, glyceryl dilaurate, glyceryl triisostearate, decaglyceryl monoisostearate, and decaglyceryl diisostearate.

3. The solid cosmetic preparation in powder form according to claim 1, wherein the pigment particles comprise at least one selected from the group consisting of titanium oxide, yellow iron oxide, red iron oxide, black iron oxide, and zinc oxide.

4. The solid cosmetic preparation in powder form according to claim 1, wherein the body pigment comprises at least one selected from the group consisting of talc, mica, kaolin, sericite, silica, boron nitride, bismuth oxychloride, cellulose, and barium sulfate.

5. The solid cosmetic preparation in powder form according to claim 1, wherein the oil content is 5.0 to 20% by mass.

6. The solid cosmetic preparation in powder form according to claim 1, wherein the content of the pigment particles surface-treated with the ester compound is 0.01 to 30% by mass.

7. The solid cosmetic preparation in powder form according to claim 1, wherein the content of said extender pigment is 20 to 80% by mass.

8. The solid cosmetic powder according to claim 1, wherein the oil component comprises the ester oil.

9. The solid cosmetic preparation in powder form according to any one of claims 1 to 8, which is a powdery foundation, face powder, eye shadow, blush, highlighter, or bronzer.

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