Dispersant for cosmetic and cosmetic containing same

Abstract

The purpose of the present invention is to provide a dispersant that, even when used in a dispersion system containing a large amount of powder, is capable of quickly exhibiting a dispersion effect with a small blending amount with respect to the amount of the powder, and that is capable of imparting a good feel of use when blended in a cosmetic. The present invention provides a dispersant that contains component (A) which is a mono-saturated fatty acid monoglyceryl in which the length of the carbon chain in the fatty acid is 14-16, and component (B) which is a mono-unsaturated fatty acid monoglyceryl in which the length of the carbon chain in the fatty acid is 18-22. The mass ratio (component (B) content / component (A) content) of the content of the component (B) with respect to the content of the component (A) is 3-20. The present invention also provides: a cosmetic containing the dispersant; and a method for improving dispersibility of powder by using the dispersant.

Description

Dispersant for cosmetics and cosmetics containing the same

[0001] The present invention relates to a dispersant for cosmetics, cosmetics containing the same, and the like.

[0002] It has been found that the functionality of powders used in cosmetics is improved by reducing their particle size. For example, fine particle titanium oxide and fine particle zinc oxide used in sunscreen cosmetics can be used as ultraviolet scattering agents because, by making their primary particle size ultrafine at 100 nm or less, the light transmittance in the visible light region can be increased and the light shielding property in the ultraviolet region can be enhanced.

[0003] However, as the primary particle size becomes smaller, the cohesive force between the particles correspondingly becomes stronger and the dispersibility decreases. Therefore, in order to obtain a sufficient dispersed state in this regard, a powerful dispersing device such as a sand grinder mill is used. However, when the primary particle size is as small as 100 nm or less, the dispersing effect is insufficient with only mechanical force. Therefore, in order to improve the dispersibility of fine particle inorganic powders in a dispersion medium, polyhydroxy fatty acids, silicone polymer copolymers, etc. have been reported as dispersants (for example, Patent Documents 1 and 2).

[0004] Japanese Patent Application Laid-Open No. 2016-222602 International Publication No. 2020 / 017346

[0005] When a large amount of powder is contained in a dispersion system, it is necessary to increase the amount of dispersant added in order to form a uniform dispersed state of the powder. However, when the dispersant in the dispersion system becomes highly concentrated (high formulation), stickiness and greasiness occur when used as a cosmetic, and the usability deteriorates.

[0006] On the other hand, if the amount of dispersant added is reduced and the dispersant in the dispersion system is made low-concentration (low formulation), the powder aggregates and it is difficult to form a uniform dispersed state. Therefore, when used as a cosmetic, problems such as white floating and a gritty feeling occur, leading to deterioration of the usability. Furthermore, in a dispersion system containing a large amount of powder, it has been a problem that it may take time to obtain a stable dispersion when the amount of dispersant formulated is small relative to the amount of powder.

[0007] The object of the present invention is to provide a dispersant that can quickly exhibit a dispersion effect even when used in dispersion systems containing a large amount of powder, with a small amount added relative to the amount of powder, and that can provide a good feel when incorporated into cosmetics.

[0008] To achieve the above objective, the inventors conducted diligent studies and found that a dispersant containing monoglyceryl monosaturated fatty acids with a carbon chain length of 14 to 16 and monoglyceryl monounsaturated fatty acids with a carbon chain length of 18 to 22 in a specific mass ratio can achieve the above objective. Based on this new finding, further studies were conducted to complete the present invention.

[0009] In other words, the present invention is as follows: [1] A dispersant comprising the following components (A) and (B), characterized in that the mass ratio of the content of component (B) to the content of component (A) (content of component (B) / content of component (A)) is 3 to 20. (A) Monoglyceryl monosaturated fatty acid having a fatty acid carbon chain of 14 to 16 (B) Monoglyceryl monounsaturated fatty acid having a fatty acid carbon chain of 18 to 22 [1-1] The dispersant according to [1] above, further comprising the following component (C), characterized in that the mass ratio of the total content of component (A) and component (B) to the content of component (C) (total content of component (A) and component (B) / content of component (C)) is 3 to 49. (C) Monoglyceryl difatty acid having a fatty acid carbon chain of 16 to 18 [2] A cosmetic composition characterized by containing the dispersant according to [1] or [1-1] above. [3] The cosmetic composition according to [2] above, characterized by containing a hydrocarbon oil. [4] The cosmetic composition according to [2] or [3] above, characterized by being an emulsified cosmetic composition. [5] A method for improving the dispersibility of powders, characterized by using the dispersant according to [1] above.

[0010] The dispersant of the present invention exhibits excellent dispersion effects quickly even when added in small amounts relative to the powder to be dispersed (i.e., even when the mass ratio of the dispersant to the powder is small). As a result, even in dispersion systems containing a large amount of powder (for example, cosmetics), when the dispersant of the present invention is used, it exhibits excellent dispersion effects quickly even at low concentrations of the dispersant in the dispersion system. Because the dispersant of the present invention exhibits the above-mentioned excellent dispersion effect, when the dispersant of the present invention is used in cosmetics, the white cast and squeaky feeling that were problems with conventional dispersants are reduced or prevented, and a good user experience can be provided.

[0011] The present invention will be described in detail below. The dispersant of the present invention contains the following components (A) and (B), and is characterized in that the mass ratio of the content of component (B) to the content of component (A) (content of component (B) / content of component (A)) is 3 to 20. (A) Monoglyceryl monosaturated fatty acid having a carbon chain of 14 to 16 (B) Monoglyceryl monounsaturated fatty acid having a carbon chain of 18 to 22

[0012] The dispersant of the present invention preferably further contains the following component (C): (C) Difatty acid monoglyceryl having a fatty acid carbon chain of 16 to 18.

[0013] <(A) Monoglyceryl monosaturated fatty acid having a carbon chain of 14 to 16 carbon atoms> The monoglyceryl monosaturated fatty acid contained as component (A) is a monoester composed of a saturated fatty acid and glycerin. In the present invention, from the viewpoint of dispersibility with a small amount of dispersant, component (A) has a fatty acid with 14 to 16 carbon atoms that forms a monoester with glycerin, and 16 carbon atoms is particularly preferred. Furthermore, the saturated fatty acid may be a straight-chain saturated fatty acid, a branched-chain saturated fatty acid, or a hydroxy saturated fatty acid, but from the viewpoint of dispersibility with a small amount of dispersant, a straight-chain saturated fatty acid or a branched-chain saturated fatty acid is preferred, and a straight-chain saturated fatty acid is more preferred.

[0014] Component (A) specifically includes monoglyceryl monomyristate, monoglyceryl monoisomyristate, monoglyceryl monohydroxymyristate, monoglyceryl monopalmitate, monoglyceryl monoisopalmitate, monoglyceryl monohydroxypalmitate, and the like. One of these may be selected and used alone, or two or more may be selected and used in combination. In the present invention, monoglyceryl monopalmitate is particularly preferred as component (A) from the viewpoint of dispersibility with a small amount of dispersant.

[0015] <(B) Monounsaturated fatty acid monoglyceryl having a carbon chain of 18 to 22 carbon atoms> The monounsaturated fatty acid monoglyceryl contained as component (B) is a monoester composed of an unsaturated fatty acid and glycerin. In the present invention, from the viewpoint of dispersibility with a small amount of dispersant, component (B) has an unsaturated fatty acid with 18 to 22 carbon atoms that forms a monoester with glycerin, preferably 18 to 20, and particularly preferably 18. The fatty acid may be a straight-chain unsaturated fatty acid, a branched-chain unsaturated fatty acid, or a hydroxyunsaturated fatty acid, but from the viewpoint of dispersibility with a small amount of dispersant, a straight-chain unsaturated fatty acid or a branched-chain unsaturated fatty acid is preferred, and a straight-chain unsaturated fatty acid is more preferred. From the viewpoint of dispersibility with a small amount of dispersant, it is preferable to have one or more unsaturated bonds, more preferably one to three, even more preferably one to two, and particularly preferably one.

[0016] Specifically, component (B) can be monoglyceryl monooleate, monoglyceryl monolinoleate, monoglyceryl monolinolenic acid, etc. One of these may be selected and used alone, or two or more may be selected and used in combination. In the present invention, from the viewpoint of dispersibility with a small amount of dispersant, monoglyceryl monooleate, monoglyceryl monolinoleate, and monoglyceryl monolinolenic acid are more preferably used as component (B), monoglyceryl monooleate and monoglyceryl monolinoleate are even more preferably used, and monoglyceryl monooleate is particularly preferably used.

[0017] <(C) Di-fatty acid monoglyceryl having a carbon chain of 16 to 18 carbon atoms> The di-fatty acid monoglyceryl optionally included as component (C) is a diester composed of a fatty acid (saturated fatty acid and / or unsaturated fatty acid) and glycerin. In the present invention, from the viewpoint of dispersibility with a small amount of dispersant, the number of carbon atoms of the fatty acid that forms the diester with glycerin is preferably 16 to 18. Furthermore, the fatty acid may be a straight-chain fatty acid, a branched-chain fatty acid, or a hydroxy fatty acid, but from the viewpoint of dispersibility with a small amount of dispersant, straight-chain fatty acids and branched-chain fatty acids are preferred, and straight-chain fatty acids are more preferred. Component (C) specifically includes monoglyceryl dipalmitate, monoglyceryl diisopalmitate, monoglyceryl dihydroxypalmitate, monoglyceryl distearate, monoglyceryl diisostearate, monoglyceryl dihydroxystearate, monoglyceryl dioleate, monoglyceryl dilinoleate, and monoglyceryl dilinolenic acid. These may be used individually or in combination of two or more. From the viewpoint of the dispersibility of the emulsified cosmetic composition of the present invention, monoglyceryl dipalmitate, monoglyceryl dioleate, and monoglyceryl dilinoleate are preferably used.

[0018] Furthermore, in the dispersant of the present invention, the mass ratio of the content of component (B) to the content of component (A) (content of component (B) / content of component (A)) (hereinafter also referred to as "mass ratio [(B) / (A)]") is 3 to 20. From the viewpoint of dispersibility with a small amount of dispersant, the mass ratio [(B) / (A)] is preferably 4 to 19, more preferably 5 to 15, and even more preferably 5 to 9. Furthermore, when the dispersant of the present invention is incorporated into a cosmetic composition, from the viewpoint of reducing or preventing white cast, the mass ratio [(B) / (A)] is preferably 5 or more, and from the viewpoint of reducing or preventing a squeaky feeling (in other words, the effect of providing a smooth feel), the mass ratio [(B) / (A)] is preferably 9 or less.

[0019] In the dispersant of the present invention, if component (C) is further included, from the viewpoint of dispersibility with a small amount of dispersant added, the mass ratio of the total content of component (A) and component (B) to the content of component (C) (hereinafter also referred to as "mass ratio [{(A) + (B)} / (C)]") is preferably 3 to 49, more preferably 4 to 33, even more preferably 5 to 20, and particularly preferably 6 to 19.

[0020] The dispersant of the present invention can be used to disperse powder in a liquid dispersion medium. When using the dispersant of the present invention, the dispersant and the dispersion medium may be mixed in advance and then mixed with the powder, or the dispersant and the dispersion medium may be added to the powder separately and then mixed.

[0021] Regarding the amount of the dispersant of the present invention used, it is preferable that the mass ratio of the dispersant to the powder to be dispersed (inorganic powder or organic powder) (hereinafter also referred to as "mass ratio [dispersant / powder]") is 0.005 to 0.5. From the viewpoint of dispersibility with a small amount of dispersant, it is preferable that the mass ratio [dispersant / powder] is 0.01 or higher. Furthermore, when the dispersant of the present invention is incorporated into a cosmetic composition, from the viewpoint of reducing or preventing white cast, it is preferable that the mass ratio [dispersant / powder] is 0.01 or higher, more preferably 0.02 or higher, and particularly preferable 0.05 or higher. Also, when the dispersant of the present invention is incorporated into a cosmetic composition, from the viewpoint of usability, the amount of dispersant in the cosmetic composition is preferably 0.05 to 10% by mass, more preferably 0.1 to 5% by mass, even more preferably 0.4 to 3% by mass, and even more preferably 0.5 to 3% by mass.

[0022] In the present invention, the powder to be dispersed is not particularly limited in terms of shape (such as plate-like, spindle-like, or needle-like), particle size, particle structure (such as porous or non-porous), etc. Organic powders or inorganic powders commonly used in cosmetics can be used, and inorganic powders are preferably used.

[0023] In the present invention, the powders to be dispersed are, specifically, inorganic extender pigments (e.g., silica, talc, kaolin, mica, aluminum oxide, calcium carbonate, magnesium carbonate, barium sulfate, etc.); inorganic white pigments (e.g., titanium dioxide, zinc oxide, zirconium oxide, etc.); inorganic red pigments (e.g., red iron oxide, iron titanate, etc.); inorganic brown pigments (e.g., γ-iron oxide, etc.); inorganic yellow pigments (e.g., yellow iron oxide (iron oxyhydroxide and ferric hydroxide), yellow ochre, etc.); Inorganic black pigments (e.g., black iron oxide (iron(III) oxide), lower titanium oxide, carbon black, etc.); inorganic purple pigments (e.g., manganese violet, cobalt violet (e.g., cobalt phosphate, hydrated ammonium cobalt phosphate, etc.)); inorganic green pigments (e.g., chromium oxide, chromium hydroxide, cobalt titanate, etc.); inorganic blue pigments (e.g., cobalt blue (cobalt aluminate), ultramarine (sodium aluminum sulfosilicate), Prussian blue (ferric ferrocyanide, ferrocyanide)). Examples include: iron oxide-coated mica (ferric ammonium ionide), pearl pigments (e.g., titanium mica (titanium oxide coated mica), titanium oxide-coated bismuth oxychloride, titanium oxide-coated talc, bismuth oxychloride, etc.); colored pearl pigments (e.g., iron oxide-coated mica, iron oxide-coated titanium mica, carbon black-coated titanium mica, black iron oxide-coated titanium mica, iron hydroxide-coated titanium mica, Prussian blue-coated titanium mica, chromium hydroxide-coated titanium mica, chromium oxide-coated titanium mica, cobalt titanate-coated titanium mica, lower titanium oxide-coated mica, etc.); organic extender pigments (e.g., polyurethane, polystyrene, nylon, polymethyl methacrylate, polymethylsilsesquioxane powder, organopolysiloxane elastomer powder, cellulose, crystalline cellulose, polyethylene, crosslinked polymethyl (meth)acrylate, polyester, styrene-acrylic acid copolymer, benzoguanamine, tetrafluoroethylene, cellulose acetate, etc.); organic tar-based pigments; and dye powders (e.g., organic dye lake pigments, etc.).

[0024] In the present invention, powders obtained by hydrophobizing the surface of the above-mentioned pigments with organic compounds such as silicone compounds, fluorine compounds (e.g., perfluoroalkyl phosphate esters, perfluoroalkyl phosphates, perfluoroalkylsilanes, etc.), silane coupling agents, fatty acids (e.g., stearic acid, isostearic acid, etc.), acylated fatty acids (e.g., N-stearoyl-L-glutamic acid, etc.), metal soaps (e.g., aluminum stearate, etc.), and amino acids can also be used.

[0025] In the present invention, from the viewpoint of dispersibility with a small amount of dispersant, when using hydrophobized powder, the hydrophobization treatment is preferably performed with a silicone compound, a silane coupling agent, or a fatty acid, more preferably with a silicone compound or a silane coupling agent, and even more preferably with a silicone compound.

[0026] Furthermore, when incorporating the dispersant of the present invention into cosmetics, it is more preferable to use silica, talc, mica, iron oxide, titanium dioxide, and zinc oxide from the viewpoint of reducing or preventing white cast and a squeaky feeling, and it is particularly preferable to use titanium dioxide and zinc oxide for white coloring and UV protection.

[0027] In the present invention, the average particle size of the powder to be dispersed can be within an appropriate range depending on its application. When used as a pigment, it is preferably 10 nm to 100 μm, more preferably 50 nm to 50 μm, and even more preferably 100 nm to 30 μm. When used as an ultraviolet scattering agent, it is preferably 10 nm to 100 nm, and more preferably 10 nm to 50 μm. In this specification, "average particle size" refers to the value of the volume-average particle size measured by laser diffraction and scattering.

[0028] In the present invention, the above powders can be used individually or in combination of two or more. Furthermore, when the dispersant of the present invention is incorporated into a cosmetic composition, from the viewpoint of usability, the amount of powder incorporated into the cosmetic composition is preferably 30% by mass or less, and more preferably 25% by mass or less.

[0029] As the powder mentioned above, commercially available products provided by various companies for cosmetic use can be used.

[0030] In the present invention, an oil that is liquid at 25°C is preferred as the dispersion medium for dispersing the above powder (inorganic powder or organic powder). That is, in the present invention, the dispersion medium can be any oil that is fluid at 25°C and is used in cosmetics, without any particular limitations, and examples include animal and vegetable oils, hydrocarbon oils, ester oils (for example, triglycerides of medium-chain or branched-chain fatty acids, esters of medium-chain or long-chain fatty acids and branched-chain aliphatic alcohols, liquid esters of unsaturated carboxylic acids or aromatic carboxylic acids, diglycerides of medium-chain or branched-chain fatty acids, etc.), silicone oils, liquid higher fatty acids, liquid higher alcohols, etc.

[0031] Examples of hydrocarbon oils include liquid paraffin, hydrogenated polyisobutene (light liquid isoparaffin, liquid isoparaffin, heavy liquid isoparaffin), paraffin, dodecane, isododecane, squalene, and squalane, with squalane, hydrogenated polyisobutene, and isododecane being preferred, and squalane and isododecane being more preferred.

[0032] Examples of medium-chain or branched-chain fatty acid triglycerides include tri(caprylic / capric acid) glyceryl, tri-2-ethylhexanoate glyceryl, and triisostearate glyceryl, with tri(caprylic / capric acid) glyceryl being preferred.

[0033] Examples of esters of medium-chain or long-chain fatty acids with branched-chain aliphatic alcohols include isononyl isononanoate, isopropyl myristate, octyldodecyl myristate, isopropyl palmitate, and 2-ethylhexyl palmitate. Isononyl isononanoate, isopropyl myristate, and 2-ethylhexyl palmitate are preferred, and isononyl isononanoate and 2-ethylhexyl palmitate are more preferred.

[0034] Examples of silicone oils include polysiloxanes (e.g., dimethylpolysiloxane, methylphenylpolysiloxane, methylhydrogenpolysiloxane, etc.), cyclic polysiloxanes (e.g., octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane, tetrahydrotetramethylcyclotetrasiloxane, etc.), polyoxyethylene-methylpolysiloxane copolymers, polyoxyethylene-polydimethylsiloxyethyl-methylpolysiloxane copolymers, and other silicone-based surfactants. Dimethylpolysiloxane, methylphenylpolysiloxane, and polyoxyethylene-methylpolysiloxane copolymers are preferred, and dimethylpolysiloxane and polyoxyethylene-methylpolysiloxane copolymers are more preferred.

[0035] Examples of liquid higher fatty acids include unsaturated fatty acids such as oleic acid, linoleic acid, and linolenic acid, and branched-chain fatty acids such as isopalmitic acid and isostearic acid, with oleic acid and isostearic acid being preferred.

[0036] Examples of liquid esters of unsaturated or aromatic carboxylic acids include 2-ethylhexyl paramethoxycinnamate, 2-ethoxyethyl paramethoxycinnamate (cinoxate), 2-ethylhexyl 2-cyano-3,3-diphenyl-2-propenoate (octocrylene), 2-ethylhexyl salicylate, and 3,3,5-trimethylcyclohexyl salicylate (homosalate).

[0037] When the dispersant of the present invention is incorporated into a cosmetic composition, from the viewpoint of reducing or preventing white cast and squeaky feeling, hydrocarbon oil, esters of medium-chain or long-chain fatty acids and branched-chain aliphatic alcohols, and silicone oil are preferably used as the dispersion medium, more preferably hydrocarbon oil, esters of medium-chain or long-chain fatty acids and branched-chain aliphatic alcohols, and even more preferably hydrocarbon oil. Furthermore, from the viewpoint of dispersibility, the amount of hydrocarbon oil incorporated in an oil-in-water emulsion cosmetic composition is preferably 1 to 30% by mass, and more preferably 5 to 20% by mass. Furthermore, from the viewpoint of dispersibility, the amount of hydrocarbon oil incorporated in an oil-in-water emulsion cosmetic composition is preferably 5 to 50% by mass, and more preferably 10 to 40% by mass.

[0038] In the present invention, the above-mentioned dispersion medium (liquid oil) can be used individually or in combination of two or more types.

[0039] As the dispersion medium (liquid oil) mentioned above, commercially available products provided by various companies for use in cosmetics, etc., can be used.

[0040] The present invention also relates to a cosmetic composition containing the dispersant of the present invention as described above (hereinafter also referred to as "the cosmetic composition of the present invention"). Examples of cosmetic compositions in the present invention include beauty serums, lotions, emulsions, sunscreens, makeup bases, makeup cosmetics (e.g., liquid foundations, mascaras, lipsticks), and cleansing cosmetics. In the present invention, emulsified cosmetic compositions (e.g., sunscreens, makeup bases, makeup cosmetics, etc.) are preferred. In the present invention, emulsified cosmetic compositions include oil-in-water cosmetic compositions and water-in-oil cosmetic compositions. The cosmetic composition of the present invention preferably contains the dispersion medium described above and the powder that is the target of the dispersion described above.

[0041] The present invention also relates to a method for improving the dispersibility of powders (hereinafter, also referred to as "the method for improving the dispersibility of powders of the present invention"), which is characterized by using the dispersant of the present invention described above. The method for improving the dispersibility of powders of the present invention can improve the dispersibility of powders by mixing the powders and the dispersant of the present invention by a method generally known in the fields such as cosmetics. In the present invention, the dispersant and the dispersion medium may be mixed in advance and the mixture may be mixed with the powders, or the dispersant and the dispersion medium may be separately added to the powders and mixed. In the method for improving the dispersibility of powders of the present invention, the amount of the dispersant of the present invention used, the dispersion medium, the powders to be dispersed, etc. are the same as the amount of the dispersant of the present invention used, the dispersion medium, the powders to be dispersed, etc. described above.

[0042] Hereinafter, the present invention will be described in more detail with reference to Examples and Test Examples, but the present invention is not limited thereto.

[0043] [Test Example 1] Dispersing effect of powders in a dispersion medium by adding a dispersant In order to confirm the dispersing effect of powders in a dispersion medium by adding the dispersant of the present invention, the following test was conducted. The compositions of the dispersants a to j used in the test are shown in Table 1. Dispersants a to f are the dispersants of the present invention, and dispersants g to j are the dispersants of the comparative examples.

[0044] (Preparation of samples of Examples 1 to 13 and Comparative Examples 1 to 7) The dispersants, powders, and dispersion media shown in Table 2 were used. 47.5 g of the dispersion medium was taken in a 300 ml beaker, 2.5 g of the dispersant and 50 g of the powders were added, and the mixture was stirred at 3000 rpm for 1 minute or 10 minutes using a disperser to prepare samples of Examples 1 to 13 and Comparative Examples 1 to 7 (samples stirred for 1 minute and samples stirred for 10 minutes, respectively).

[0045] (Evaluation of the dispersibility of each sample) For each of the samples prepared above, the dispersibility was visually evaluated according to the following evaluation criteria. The results are shown in Table 2. <Evaluation criteria> ◎: All the powders are uniformly dispersed in the dispersion medium. ○: Most of the powders are uniformly dispersed in the dispersion medium, but a small amount remains at the bottom. △: About half of the powders are dispersed in the dispersion medium, but aggregation is also observed. ×: The powders are not dispersed at all in the dispersion medium.

[0046]

[0047]

[0048] From the results in Table 2, it was shown that all the samples of Examples 1 to 13 using the dispersants a to f of the present invention had excellent dispersibility.

[0049] [Test Example 2] Evaluation of the feel of cosmetics containing a dispersant In order to confirm the effect of reducing or preventing the whitening and squeaking of cosmetics by using the dispersant of the present invention, the following tests were conducted.

[0050] (Preparation of cosmetics of Examples 14 to 24 and Comparative Examples 8 and 9) According to the blending ratios shown in Tables 3 and 4, the dispersion medium, dispersant, and emulsifier were heated to 80°C and uniformly mixed, then the powder was added, and the mixture was stirred at 3000 rpm for 5 minutes using a disperser, and water was gradually added while stirring to emulsify, and the cosmetics of Examples 14 to 24 and Comparative Examples 8 and 9 were prepared.

[0051] (Evaluation of the presence or absence of whitening immediately after application) For each of the above-prepared cosmetics, 20 panelists applied 0.5 g of each cosmetic to their forearms, and a sensory evaluation (visual) was conducted on the presence or absence of whitening immediately after application, and scoring was performed according to the following evaluation criteria. <Evaluation criteria> 2 points: No whitening was observed on the skin after application. 1 point: A little whitening was observed on the skin after application. 0 point: Whitening was observed on the skin after application.

[0052] (Judgment of the effect of reducing or preventing whitening) The total score of the 20 panelists' scores in the above evaluation was calculated, and the effect of reducing or preventing whitening was judged according to the following judgment criteria. The higher the score, the higher the effect of reducing or preventing whitening. The judgment results are shown in Tables 3 and 4. <Judgment criteria> ◎: The total score of the evaluation is 35 points or more. ○: The total score of the evaluation is 30 points or more and 34 points or less. △: The total score of the evaluation is 20 points or more and 29 points or less. ×: The total score of the evaluation is 19 points or less.

[0053] (Evaluation of the presence or absence of squeaky feeling immediately after application) For each of the cosmetics prepared above, 20 panelists applied 0.5g of each cosmetic to their forearms and performed a sensory evaluation of the presence or absence of squeaky feeling (and smoothness), and scored them according to the following evaluation criteria. <Evaluation Criteria> 2 points: Smoothness was strongly felt, and there was almost no squeaky feeling. 1 point: Smoothness was felt to some extent, but there was a slight squeaky feeling. 0 points: Smoothness was hardly felt, and there was a squeaky feeling.

[0054] (Assessment of the effect of reducing or preventing squeaking) The total score of the 20 panelists in the above evaluation was calculated, and the effect of reducing or preventing squeaking was judged according to the following criteria. A higher score indicates a greater effect of reducing or preventing squeaking. The judgment results are shown in Tables 3 and 4. <Judgment Criteria> ◎: The total score is 35 points or more. ○: The total score is 30 points or more and 34 points or less. △: The total score is 20 points or more and 29 points or less. ×: The total score is 19 points or less.

[0055]

[0056]

[0057] The results in Tables 3 and 4 show that the cosmetic compositions of Examples 14 to 24 using the dispersant of the present invention all have the effect of reducing or preventing white cast and squeaky feeling. The cosmetic compositions using the dispersant of the present invention showed less white cast and squeaky feeling, and a good feel when used.

[0058] Examples of cosmetic formulations (sunscreen, mascara, liquid foundation, lipstick) containing the dispersant of the present invention are shown below. In Tables 5 to 8, % indicates mass %.

[0059] [Prescription Examples 1 and 2] Sunscreen

[0060]

[0061] [Prescription Example 3] Mascara

[0062]

[0063] [Formulation Example 4] Liquid Foundation

[0064]

[0065] [Prescription Example 5] Lipstick

[0066]

[0067] According to the present invention, even when used in dispersion systems containing a large amount of powder, a dispersant can quickly exhibit a dispersion effect with a small amount relative to the amount of powder, and can also provide a good feel when incorporated into cosmetics.

[0068] This application is based on Japanese Patent Application No. 2025-001995, the contents of which are fully incorporated herein.

Claims

1. A dispersant characterized by containing the following components (A) and (B), wherein the mass ratio of the content of component (B) to the content of component (A) (content of component (B) / content of component (A)) is 3 to 20. (A) Monoglyceryl monosaturated fatty acid having a carbon chain of 14 to 16 carbon atoms (B) Monoglyceryl monounsaturated fatty acid having a carbon chain of 18 to 22 carbon atoms 2. A cosmetic composition characterized by containing the dispersant described in claim 1.

3. The cosmetic composition according to claim 2, characterized by containing a hydrocarbon oil.

4. The cosmetic composition according to claim 2 or 3, characterized in that it is an emulsified cosmetic composition.

5. A method for improving the dispersibility of powders, characterized by using the dispersant described in claim 1.

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