Warm-sensing cosmetic

Abstract

An object of the present application is to provide a water-in-oil type temperature-sensing cosmetic which exhibits an excellent temperature-sensing effect, has a good use feeling, and is excellent in storage stability. The present application relates to a temperature-sensing cosmetic characterized by containing a polyhydric alcohol, an oil phase thickening agent, an emulsifier, and water.

Description

Technical Field

[0001] This invention relates to a warming cosmetic that imparts a warming sensation when applied to the skin. More specifically, this invention relates to a water-in-oil warming cosmetic that exhibits excellent emulsification stability, provides cosmetic effects, and offers a pleasant user experience. Background Technology

[0002] It is generally known that imparting a moderate warming sensation to the skin promotes blood circulation, increases metabolism, and can result in improved complexion, relaxation, and fatigue recovery. Therefore, warming substances are often incorporated into cosmetics in anticipation of these effects. Commonly used warming substances in cosmetics include humectants such as polyols, zeolites, metal salts, and metal oxides. These are all hygroscopic and generate heat upon contact with moisture on the skin, thus providing a warming sensation.

[0003] Patent Document 1 proposes using a specific nonionic surfactant to emulsify a polyol, thereby producing a polyol-in-oil type temperature-sensitive cosmetic, which achieves both moderate viscosity and excellent temperature-sensing effect. Patent Document 2 proposes dispersing highly pyrogenic zeolite in a polyol solvent to enhance the temperature-sensing effect.

[0004] As mentioned above, various bases have been proposed for temperature-sensitive cosmetics. The cosmetic in Patent Document 1 uses an oil-in-water base, and the polyol comes into direct contact with the skin, resulting in a significantly high level of stickiness. Therefore, it is a rinse-off cleanser applied to the skin and then rinsed off after a certain period of time. Furthermore, the cosmetic in Patent Document 2 is a leave-on type, but it is non-aqueous, making it difficult to stably combine with aqueous solutions containing salt-based agents with cosmetic effects.

[0005] Therefore, there is a need for an oil-in-water base that can also be used with whitening ingredients and other cosmetic agents that have excellent temperature-sensitive effects, as well as excellent stability and usability.

[0006] Existing technical documents

[0007] Patent documents

[0008] Patent Document 1: Japanese Patent Application Publication No. 2014-37404

[0009] Patent Document 2: Japanese Patent Application Publication No. 2016-193841 Summary of the Invention

[0010] The problem the invention aims to solve

[0011] The purpose of this invention is to provide an oil-in-water type temperature-sensitive cosmetic that exhibits excellent temperature-sensing effects, a pleasant user experience, and excellent preservation stability.

[0012] Solution for solving the problem

[0013] The inventors have conducted intensive research and discovered that the above-mentioned objectives can be achieved by combining polyols, oil-phase thickeners, emulsifiers, and water, thereby completing this invention.

[0014] That is, the present invention is characterized in that an oil-in-water type temperature-sensitive cosmetic contains:

[0015] Polyols,

[0016] Oil phase thickener

[0017] Emulsifiers, and

[0018] water.

[0019] The effects of the invention

[0020] The temperature-sensitive cosmetic of the present invention exhibits excellent temperature-imparting effects and superior emulsification stability. Furthermore, by being formulated as a water-in-oil type, the temperature-sensitive cosmetic of the present invention prevents direct contact between polyols and the skin. Therefore, although it contains a high concentration of moisturizers (polyols), it suppresses stickiness compared to conventional oil-in-water or polyol-in-oil type temperature-sensitive cosmetics. Thus, the temperature-sensitive cosmetic of the present invention can also be used as a base for leave-on temperature-sensitive cosmetics. Additionally, since it can be combined with water, it can also be combined with salt-based agents with cosmetic effects, such as whitening ingredients. Detailed Implementation

[0021] The temperature-sensitive cosmetic of the present invention is characterized in that it contains polyol, oil-phase thickener, emulsifier and water as essential ingredients. The present invention will now be described in detail.

[0022] <Polyols>

[0023] The polyols used in the temperature-sensitive cosmetics of this invention refer to those that impart a temperature sensation when applied to the skin. Specific examples are not limited but can include: glycerin, diglyceride, polyglycerol, 1,3-butanediol, ethylene glycol, propylene glycol, dipropylene glycol, polyethylene glycol (PEG-8, etc.), polypropylene glycol, polyethylene glycol-polypropylene glycol, methyl glucetol polyether-10, trimethylolethane, trimethylolpropane, erythritol, pentaerythritol, sorbitol, glucose, sorbitol, maltitol, sucrose, raffinose, hexanediol, 1,2-pentanediol, trehalose, etc.

[0024] Among these, it is preferable to use them in combination with glycerin, dipropylene glycol, polyethylene glycol, 1,3-butanediol, methyl glucetol polyether-10, etc.

[0025] In addition, through the combination of polyols, a warming effect can be produced to deliver the product to bright and rosy skin, while the high moisturizing effect prevents makeup from fading due to dryness.

[0026] In the cosmetic of the present invention, the amount of polyol incorporated is 20% by mass or more relative to the total amount of the cosmetic, preferably 20 to 80% by mass, and more preferably 30 to 70% by mass. If the amount of polyol incorporated is less than 20% by mass, the warming sensation during use cannot be adequately obtained.

[0027] <Oil phase thickener>

[0028] The oil-phase thickener used in the temperature-sensitive cosmetic of the present invention refers to one that imparts viscosity to the oil phase. Examples include: emulsifying or non-emulsifying cross-linked siloxane elastomers, dextrin fatty acid esters, hydrophobically modified polysaccharides, fatty acids, waxes, etc. In this invention, from the viewpoint of suppressing stickiness, non-emulsifying cross-linked siloxane elastomers are preferred.

[0029] As a non-emulsifying cross-linked silicone elastomer, there are no particular limitations, but examples include: methyl polysiloxane cross-linked polymers, methyl phenyl polysiloxane cross-linked polymers, vinyl polydimethylsiloxane / lauryl polydimethylsiloxane cross-linked polymers, lauryl polydimethylsiloxyethyl polydimethylsiloxane / bisvinyl polydimethylsiloxane cross-linked polymers, alkyl (C30-45) cetearyl polydimethylsiloxane cross-linked polymers, cetearyl polydimethylsiloxane cross-linked polymers, etc. These non-emulsifying cross-linked silicone elastomers are commercially available in the form of swollen products that swell in various oils such as silicone oil, mineral oil, triisooctyl glycerol, and squalane. Specific examples include the following.

[0030] Examples of methyl polysiloxane crosslinked polymers include: 9040 silicone elastomer blends, 9041 silicone elastomer blends, 9045 silicone elastomer blends, EL-8040ID silicone-organic blends (all manufactured by Dow Corning Toray Co., Ltd.), etc.; or KSG-15, KSG-16, KSG-1610 (all manufactured by Shin-Etsu Chemical Co., Ltd.), etc.; KSP-100 (manufactured by Shin-Etsu Chemical Co., Ltd.), etc.; and TOSPEARL 150KA (manufactured by Momentive Performance Materials Co., Ltd.), etc.

[0031] Examples of methylphenyl polysiloxane crosslinked polymers include KSG-18A (polydimethylsiloxane / phenyl vinyl polydimethylsiloxane crosslinked polymer, manufactured by Shin-Etsu Chemical Industry Co., Ltd.) and other polydimethylsiloxane / phenyl polydimethylsiloxane crosslinked polymers.

[0032] Examples of vinyl polydimethylsiloxane / lauryl polydimethylsiloxane crosslinked polymers include: KSG-41A, KSG-42A, KSG-43, and KSG-44 (all manufactured by Shin-Etsu Chemical Industry Co., Ltd.).

[0033] Examples of swelling agents for lauryl polydimethylsiloxane-oxyethyl polydimethylsiloxane / bisvinyl polydimethylsiloxane crosslinked polymers include KSG-042Z and KSG-045Z (both manufactured by Shin-Etsu Chemical Co., Ltd.).

[0034] Examples of alkyl (C30-45) cetearyl polydimethylsiloxane crosslinking polymers include VELVESIL 125 and VELVESIL 034 (both manufactured by Momentive Performance Materials).

[0035] Examples of cetearyl-based polydimethylsiloxane crosslinked polymers include VELVESIL DM (manufactured by Momentive Performance Materials).

[0036] The amount of the oil-phase thickener in the cosmetic of the present invention is more than 1.25% by mass and less than 15% by mass relative to the total amount of the cosmetic, preferably 1.26 to 12% by mass, more preferably 1.27 to 10% by mass, and even more preferably 1.28 to 10% by mass. If the amount of the oil-phase thickener is less than 1.25% by mass, there is a tendency for poor emulsification stability or poor usability. On the other hand, if it is added in amounts exceeding 15% by mass, it is difficult to prepare a stable cosmetic.

[0037] As the oil phase thickener of the present invention, it can be used in combination with one or more of the above-mentioned non-emulsifying cross-linked siloxane elastomers.

[0038] <Emulsifier>

[0039] The emulsifier used in the temperature-sensitive cosmetic of this invention refers to one with relatively high lipophilicity, capable of exerting an emulsifying and stabilizing effect on both the aqueous and oily components of a highly complexed polyol. In this invention, polyether-modified organosilicon or organomodified clay minerals with specific properties are preferably used.

[0040] The so-called polyether-modified silicone used as the emulsifier of the present invention, having the specific properties described above, is one with an HLB of 8.0 or less and a viscosity of 10,000 mmHg at 25°C. 2 / s or higher, preferably 15000mm 2 / s or higher, and preferably 20000mm 2 / s or higher. If the viscosity is less than 10000 mm 2 If the emulsion stability is not good, then a / s ratio cannot be obtained.

[0041] As a specific example of polyether-modified organosilicon, PEG / PPG (Poly Propylene Glycol)-19 / 19 polydimethylsiloxane (trade name "BY11-030", HLB=3, viscosity 30000 mm) can be cited. 2 / s; manufactured by Dow CorningToray, etc.

[0042] The organic modified clay mineral used in this invention is a colloidal hydrous aluminum silicate with a three-layer structure, which can be produced by modifying the clay mineral represented by the following general formula (1) using a quaternary ammonium salt cationic surfactant.

[0043] (x, Y) 2-3 (Si, Al)4O 10 (OH)2Z 1 / 3 ·nH2O (1)

[0044] In the above formula, X is Al, Fe(III), Mn(III) or Cr(III), Y is Mg, Fe(II), Ni, Zn or Li, and Z is K, Na or Ca.

[0045] Specifically, it can be obtained by treating natural or synthetic montmorillonite groups (commercially available products such as magnesium aluminum silicate, Kunipia, and synthetic lithium saponite) such as montmorillonite, saponite, and lithium montmorillonite (in which case the (OH) group in the formula is replaced by fluorine), and clay minerals such as sodium silicate mica or sodium or lithium band mica (commercially available products such as Dimonite; manufactured by TOPY INDUSTRIES, etc.) with quaternary ammonium salt cationic surfactants.

[0046] The quaternary ammonium salt cationic surfactant used here is represented by the following general formula (2).

[0047]

[0048] In the formula, R 1 R represents an alkyl or benzyl group having 10 to 22 carbon atoms. 2 R represents a methyl group or an alkyl group having 10 to 22 carbon atoms. 3 and R 4 It indicates an alkyl or hydroxyalkyl group with 1 to 3 carbon atoms, and X indicates a halogen atom or a methyl sulfate residue.

[0049] Examples of quaternary ammonium salt-type cationic surfactants include: dodecyltrimethylammonium chloride, myristyltrimethylammonium chloride, cetyltrimethylammonium chloride, stearyltrimethylammonium chloride, arachidictrimethylammonium chloride, benzylic trimethylammonium chloride, myristyl dimethyl ethyl ammonium chloride, cetyl dimethyl ethyl ammonium chloride, stearyl dimethyl ethyl ammonium chloride, arachidic dimethyl ethyl ammonium chloride, benzylic dimethyl ethyl ammonium chloride, myristyl diethyl methyl ammonium chloride, cetyl... Diethylmethylammonium chloride, stearyl diethylmethylammonium chloride, arachidyl diethylmethylammonium chloride, benzyl diethylmethylammonium chloride, benzyl dimethylmyristyl ammonium chloride, benzyl dimethyl cetyl ammonium chloride, benzyl dimethyl stearyl ammonium chloride, benzyl dimethyl benzyl ammonium chloride, benzyl methyl ethyl cetyl ammonium chloride, benzyl methyl ethyl stearyl ammonium chloride, dibenzyl dihydroxyethyl ammonium chloride, and equivalent bromides, and further, dipalmitylpropyl ethylammonium methyl sulfate, etc. In the implementation of this invention, one or more of these may be selected arbitrarily.

[0050] Representative examples of organically modified clay minerals include: dimethyldistearate lithium montmorillonite, dimethylalkylammonium lithium montmorillonite, benzyldimethylstearate lithium montmorillonite, and distearate dimethylammonium chloride-treated magnesium aluminum silicate. Dimethyldistearate lithium montmorillonite is particularly preferred. Commercially available products include BENTONE 27 (benzyldimethylstearate chloride-treated lithium montmorillonite: manufactured by Elementis Japan) and BENTONE 38VCG (distearate dimethylammonium chloride-treated lithium montmorillonite: manufactured by Elementis Japan).

[0051] The amount of emulsifier in the cosmetic of the present invention is 0.1 to 5% by mass relative to the total amount of the cosmetic, preferably 0.2 to 4% by mass, and more preferably 0.4 to 3% by mass. If the amount is less than 0.1% by mass, viscosity is not easily observed and stability is poor. If it exceeds 5% by mass, a sticky or powdery feeling from the emulsifier will be produced, which is not preferred in terms of usability.

[0052] <Water>

[0053] In the temperature-sensitive cosmetic of the present invention, water (ion-exchanged water, purified water, natural water, etc.) can be used as an aqueous solvent. However, the presence of an aqueous solvent reduces the temperature-sensitive effect; therefore, when using an aqueous solvent, its amount relative to the total amount of the temperature-sensitive cosmetic should be kept to 10% by mass or less, preferably 8% by mass or less, and more preferably 5% by mass or less. Therefore, from the viewpoint of ensuring sufficient dissolution of the whitening agent and other agents and achieving a real temperature-sensitive effect in the temperature-sensitive cosmetic of the present invention, it is preferable to set the amount of water to 0.1 to 10% by mass, or 1 to 10% by mass, more preferably 0.1 to 8% by mass, or 1 to 8% by mass, and even more preferably 1 to 5% by mass.

[0054] <Whitening Agent>

[0055] Conventional no-rinse temperature-sensitive cosmetics are non-aqueous and difficult to incorporate with water-soluble agents. In contrast, the temperature-sensitive cosmetic of the present invention contains water and is therefore characterized in that it can be incorporated with water-soluble agents.

[0056] The whitening agents used in conjunction with these products can be any whitening agents commonly found in cosmetics; there are no particular limitations. Examples include: ascorbic acid (vitamin C), tranexamic acid, kojic acid, ellagic acid, arbutin, alkoxysalicylic acid, and their salts or derivatives. More specific examples include: sodium L-ascorbate, magnesium L-ascorbate, L-ascorbate glucoside, 2-O-ethyl-L-ascorbic acid, 3-O-ethyl-L-ascorbic acid, sodium 4-methoxysalicylate, potassium 4-methoxysalicylate, etc.

[0057] In this invention, potassium 4-methoxysalicylate can be used preferably.

[0058] In addition, it can be used in conjunction with medications other than whitening agents. Examples of medications include: Vitamin A, Vitamin A palmitate, Vitamin A acetate and other Vitamin A derivatives; Vitamin B6 hydrochloride, Vitamin B6 trimalpalate, Vitamin B6 dicaprylate, Vitamin B2 and its derivatives, Vitamin B12, Vitamin B15 and its derivatives and other B vitamins; α-Vitamin E, β-Vitamin E, Vitamin E acetate and other Vitamin E derivatives; Vitamin D derivatives; Vitamin H; pantothenic acid; pantothenic acid; gamma-oryzanol; allantoin; glycyrrhizic acid (salt). Extracts from plants including glycyrrhetinic acid, glycyrrhetinic acid stearate, juniper alcohol, bisabolol, eucalyptol, thymol, inositol, saikosaponin, ginsenosides, loofah saponin, soapberry saponin, panthenol ether, arbutin, senna alkaloids, and various pharmaceuticals; extracts from plants such as rhubarb, sophora flavescens, Japanese lotus root, orange, litchi grass, sawgrass, round-leaved mallow, angelica, thyme, angelica sinensis, bitter orange, birch, horsetail, loofah, horse chestnut, saxifrage, scutellaria baicalensis, arnica, lily, mugwort, peony, aloe, gardenia, cherry leaves, and pigments such as β-carotene.

[0059] The dosage of the pharmaceutical agent of the present invention can be arbitrarily determined within a range that allows it to dissolve in temperature-sensitive cosmetics. From the viewpoint of obtaining sufficient pharmaceutical effect in cosmetics, 0.5 to 4% by mass is preferred, and more preferably 1 to 3% by mass.

[0060] <Polyether-modified organosilicon>

[0061] In this invention, by combining HLB with a viscosity of less than 8.0 and less than 10000 mm at 25°C... 2 / s of polyether-modified organosilicon can further improve emulsion stability. Among them, it is preferable that the side chains do not have alkyl chains and the side chains of the linear or branched polysiloxane backbone have polyoxyalkylene groups.

[0062] Specific examples of polyether-modified organosilicones with a linear polysiloxane backbone include: PEG-3 polydimethylsiloxane (trade name "KF-6015", HLB=4.5, viscosity 150 mm). 2 / s; manufactured by Shin-Etsu Chemical Industry Co., Ltd.), PEG-9 methyl ether polydimethylsiloxane (trade name "KF-6016", HLB=4.5, viscosity 150mm) 2 / s; manufactured by Shin-Etsu Chemical Industry Co., Ltd.), PEG-10 polydimethylsiloxane (trade name "KF-6017P", HLB=4.5, viscosity 850 mm) 2 / s; manufactured by Shin-Etsu Chemical Industry Co., Ltd.), PEG-12 polydimethylsiloxane (trade name "SH3772M", HLB=6, viscosity 1050 mm) 2 / s, Product name "SH3773M", HLB=8, Viscosity 650mm 2 / s, Product name "SH3775M", HLB=5, Viscosity 1600mm 2 / s; all of the above are manufactured by Dow Corning Toray), PEG / PPG-20 / 22 butyl ether polydimethylsiloxane (trade name "KF-6012", HLB=7.0, viscosity 1600mm). 2 / s; manufactured by Shin-Etsu Chemical Industry Co., Ltd., etc.

[0063] Specific examples of polyether-modified organosilicon with a branched polysiloxane backbone include: PEG-9 polydimethylsiloxyethyl polydimethylsiloxane (trade name "KF-6028", HLB=4, viscosity 900 mm). 2 / s; manufactured by Shin-Etsu Chemical Industry Co., Ltd.), lauryl PEG-9 polydimethylsiloxyethyl polydimethylsiloxane (trade name "KF-6038", HLB=3, viscosity 700mm) 2 / s; manufactured by Shin-Etsu Chemical Industry Co., Ltd.), cetyl PEG / PPG-10 / 1 polydimethylsiloxane (trade name "KF-6048", HLB=3.5, viscosity 2700 mm) 2 / s; manufactured by Shin-Etsu Chemical Industry Co., Ltd., etc.

[0064] The amount of polyether-modified organosilicon in the cosmetic of the present invention is 0.1 to 10% by mass or less relative to the total weight of the cosmetic, preferably 0.3 to 6% by mass, and more preferably 1 to 5% by mass.

[0065] <Oil content>

[0066] In the temperature-sensitive cosmetic of the present invention, an oil is preferably incorporated to improve the user experience when applied to the skin. As for the oil, any oil that can be used in conventional cosmetics can be used without particular restrictions.

[0067] Examples include: flaxseed oil, camellia oil, macadamia nut oil, corn oil, olive oil, avocado oil, camellia flower oil, castor oil, safflower oil, almond oil, cinnamon oil, jojoba oil, grape oil, sunflower seed oil, almond oil, rapeseed oil, sesame oil, wheat germ oil, rice germ oil, rice bran oil, cottonseed oil, soybean oil, peanut oil, tea seed oil, evening primrose oil, and other oils; fatty acids such as heptanoic acid, caprylic acid, nonanoic acid, decanoic acid, pentadecanoic acid, heptadecanoic acid, nonadecanoic acid, isostearic acid, oleic acid, linoleic acid, linolenic acid, arachidonic acid, etc.; and pentaerythritol tetracaprylate, cetyl octanoate, hexyl laurate, isopropyl myristate, etc. Esters such as octyl myristate, octyl palmitate, isopropyl isostearate, octyl isopalmitate, isodecanyl oleate, and cetyl ethylhexanoate; hydrocarbons such as liquid paraffin, squalane, squalene, olefin oligomers, hydrogenated polydecene, alkanes, isoalkanes, octane, decane, dodecane, isododecane, hexadecane, and isohexadecane; higher alcohols such as octanol, isostearyl alcohol, and oleyl alcohol; chain organosilicones such as dimethyl polysiloxane, methylphenyl polysiloxane, and methylhydropolysiloxane; cyclic organosilicones such as octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, and dodecylcyclohexasiloxane; or silicone oils such as octyl polymethylsiloxane.

[0068] In the cosmetic of the present invention, multiple oils described above can be combined. The amount of oil added is 10 to 50% by mass relative to the total amount of the cosmetic, more preferably 15 to 40% by mass, and even more preferably 15 to 35% by mass. If the amount of oil added is less than 10% by mass, the outer oil phase is insufficient, making emulsification difficult. Furthermore, the lightness or good spreadability when applied to the skin cannot be adequately obtained. If the amount added exceeds 50% by mass, the inner water phase is insufficient, resulting in poor viscosity and compromised stability.

[0069] <Other Ingredients>

[0070] In addition to the above-mentioned ingredients, the temperature-sensitive cosmetic of the present invention may, as needed, be appropriately combined with other ingredients commonly used in cosmetics, such as powder ingredients, ultraviolet protectants, various aqueous solvents, thickeners, masking agents, sugars, amino acids, organic amines, pH adjusters, stabilizers, skin nutrients, antioxidants, antioxidant auxiliaries, fragrances, etc., without impairing the effects of the present invention.

[0071] The average emulsified particle size of the water droplets constituting the temperature-sensitive cosmetic of the present invention is 10 μm or less, and more preferably 5 μm or less. By reducing the average emulsified particle size of the water droplets, excellent emulsification stability is achieved.

[0072] The temperature-sensitive cosmetic of the present invention has a hardness of 6 or higher, preferably 8 or higher, and more preferably 10 or higher, as measured by a rheometer (11.3 mm φ, 10 mm needle) at 25°C. It can be formulated into an ointment by combining it with waxes or the like. The emulsified cosmetic of the present invention, having this level of hardness, exhibits excellent stability; for example, when filled into a bottle or container, it does not flow and maintains a suitable level of hardness.

[0073] The temperature-sensitive cosmetic of the present invention is characterized by being a single-layer type. Even when combined with water-soluble agents, the temperature-sensitive cosmetic of the present invention exhibits good emulsification stability, and despite the presence of moisturizers, it is non-sticky and provides an excellent user experience. Therefore, the temperature-sensitive cosmetic of the present invention can be widely used in cosmetics, and can be provided in any form such as lotion, serum, cream, massage cosmetic, sunscreen, foundation, pressed powder, lipstick, blush, eyeshadow, etc.

[0074] The temperature-sensitive cosmetic of the present invention can be manufactured by conventional methods. As an example, a uniform aqueous phase and an oil phase are prepared by stirring and mixing the aqueous phase component and the oil phase component separately, and the aqueous phase component is added to the oil phase while stirring and mixing.

[0075] Example

[0076] The present invention will now be described in more detail with reference to specific embodiments, but the invention is not limited to these embodiments. Unless otherwise specified, the amount of a compound is expressed as a percentage by mass. Before the embodiments, the evaluation methods used in the present invention will be described.

[0077] (1) Temperature sensing effect

[0078] Ten professional sensory inspectors conducted practical use tests on the prepared samples. Specifically, the prepared samples were applied to the faces of each sensory inspector, and the temperature sensitivity was evaluated according to the following criteria.

[0079] <Evaluation Criteria>

[0080] A: More than 8 professional sensory examiners believe that it has a warming effect.

[0081] B: Five to eight professional sensory examiners believe that there is a warming effect.

[0082] C: Three to five professional sensory examiners believe that there is a warming effect.

[0083] D: Fewer than 3 professional sensory examiners believe that there is a warming effect.

[0084] (2) Stability

[0085] For each sample, after preparation, it was placed at 0℃, 25℃, and 50℃ for one month, and then restored to room temperature. Visual observation was performed, and the presence or absence of separation was used for evaluation. Additionally, the emulsion particle size of the water droplets after sample preparation was measured using a microscope. Smaller average emulsion particles indicate better emulsion stability; if the average particle size exceeds 10 μm, an increased tendency for separation can be observed due to long-term storage.

[0086] (3) Hardness

[0087] Here, the "hardness" mentioned above was measured using a rheometer (manufactured by Fudo Kogyo Co., Ltd.) under the conditions of needle diameter: 11.3 mmφ, needle penetration distance: 10 mm, and measurement temperature: 25°C.

[0088] (4) Usability

[0089] Ten professional sensory inspectors conducted practical use tests on the prepared samples. Specifically, the prepared samples were applied to the faces of each sensory inspector, and the non-stickiness, smoothness, and lightness of spread were comprehensively evaluated based on the following criteria.

[0090] <Evaluation Criteria>

[0091] A: More than 8 professional sensory inspectors deemed it to be of excellent usability.

[0092] B: Five to eight professional functional examiners deemed it to be of excellent usability.

[0093] C: Three to five professional functional examiners deemed it to be of excellent usability.

[0094] D: Fewer than 3 professional functional inspectors considered its usability to be excellent.

[0095] [Examples 1-8, Comparative Examples 1-7]

[0096] Cosmetics were prepared using the formulations shown in Tables 1 and 2 below, and their properties were evaluated according to the evaluation methods described above. The results are presented together in Tables 1 and 2.

[0097] [Table 1]

[0098]

[0099] [Table 2]

[0100]

[0101] *1KSG-16 (Manufactured by Shin-Etsu Chemical Industry Co., Ltd.)

[0102] *2DC9041 (manufactured by Dow Corning Toray)

[0103] *3TOSPEARL 150KA (Manufactured by Momentive Performance Materials)

[0104] *4KSG-18A (Manufactured by Shin-Etsu Chemical Industry Co., Ltd.)

[0105] *5KSP-100 (Manufactured by Shin-Etsu Chemical Industry Co., Ltd.)

[0106] *6BY11-030 (Manufactured by Dow Corning Toray)

[0107] *7BENTONE 38VCG (Manufactured by Elementis Japan)

[0108] *8KF-6017P (Manufactured by Shin-Etsu Chemical Industry Co., Ltd.)

[0109] *9KF-6048 (Manufactured by Shin-Etsu Chemical Industry Co., Ltd.)

[0110] *10KF-6028 (Manufactured by Shin-Etsu Chemical Industry Co., Ltd.)

[0111] As shown in the table, the composition of this invention, comprising a humectant, an oil-phase thickener, and an emulsifier (Example 1), provides a sufficient temperature-sensitive effect, exhibits excellent emulsification stability, is non-sticky, and has a pleasant user experience. Furthermore, the compositions of Examples 2-8 can be stably formulated with whitening agents.

[0112] On the other hand, in compositions without oil-phase thickeners (Comparative Examples 1-3) and with low amounts of oil-phase thickeners (Comparative Examples 4 and 5), stability was significantly reduced, and separation occurred. Furthermore, compositions without either high-viscosity polyether-modified silicone or organically modified clay minerals (Comparative Example 6) exhibited significantly low stability. Additionally, with a high amount of water (Comparative Example 7), a sufficient temperature-sensing effect could not be obtained.

Claims

1. A water-in-oil type temperature-sensitive cosmetic, comprising: 30-80% by mass of polyols, 1.28~10% by mass of oil-phase thickener 0.4~3% by mass of emulsifier 1-5% by mass of the product has a viscosity of less than 10,000 mm at 25°C. 2 / s of polyether-modified organosilicon, 15-35% by mass of oil, and 1~5% water by mass in, The polyol is selected from glycerol, diglycerol, polyglycerol, 1,3-butanediol, ethylene glycol, propylene glycol, dipropylene glycol, polyethylene glycol, polypropylene glycol, polyethylene glycol-polypropylene glycol, methyl glucetol polyether-10, trimethylolethane, and trimethylolpropane. The oil-phase thickener is selected from one or more of emulsifying cross-linked siloxane elastomers and non-emulsifying cross-linked siloxane elastomers. The emulsifier is selected from those with a viscosity of 10000 mm at 25°C. 2 One or more of the following: polyether-modified organosilicon and distearate dimethylammonium lithium montmorillonite. The oil contains chain-like organosilicon.

2. The cosmetic product according to claim 1, wherein, The emulsifier has a viscosity of 10000 mm at 25°C. 2 Polyether-modified organosilicon with a strength of / s or higher.

3. The cosmetic product according to claim 1, wherein, The emulsifier is distearate dimethylammonium lithium montmorillonite.

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