Film-forming composition for skin, method for forming film on skin surface, and film-forming set for skin

Abstract

This film-forming composition for skin contains the following components (A) to (C). 80 mass% or more of a volatile component (A) A polyhydric alcohol (B) that is liquid at 25°C or a sugar alcohol Regenerated cellulose fibers (C) having an average fiber diameter of 0.5 μm to 5 μm and an average fiber length of 20 μm to 300 μm The film-forming composition for skin preferably includes a nonionic surfactant. Further, the film-forming composition for skin preferably includes a nonvolatile oil agent. The mass ratio (B) / (C) of component (B) to component (C) is preferably 0.1-10.

Description

Skin film-forming composition, method for forming a film on the skin surface, and skin film-forming set

[0001] The present invention relates to a film-forming composition for skin, and also to a method for forming a film on the surface of skin and a film-forming set for skin.

[0002] Various techniques for incorporating fibers into cosmetics are known. For example, Patent Document 1 proposes an emulsion in which fibers made of a thermoplastic polymer and having a number-average single fiber diameter of 1 to 500 nm are dispersed in a solvent. The document states that this emulsion has excellent uniform dispersion and long-term dispersion stability.

[0003] The present applicant has previously proposed a film-forming composition containing fibers with an average fiber diameter of 0.1 μm to 7 μm and a volatile component. This film-forming composition has the advantage of easily forming a film with excellent adhesion and durability.

[0004] US2007 / 0196401A1US2022 / 0233410A1

[0005] The present invention relates to a film-forming composition for skin containing the following components (A) to (C): (A) 80% by mass or more of a volatile component; (B) a polyhydric alcohol that is liquid at 25°C or is a sugar alcohol; and (C) regenerated cellulose fibers having an average fiber diameter of 0.5 μm to 5 μm and an average fiber length of 20 μm to 300 μm.

[0006] The present invention also relates to a method for forming a film on the surface of skin, comprising the steps of: applying to the skin a cosmetic other than the film-forming composition for skin according to claim 1 or 2, which cosmetic contains one or more oils in an amount of 1% by mass or more; and applying the film-forming composition for skin to the area of ​​the skin to which the cosmetic has been applied.

[0007] The present invention also relates to a method for forming a film on the surface of skin, comprising the steps of: applying the film-forming composition for skin according to claim 1 or 2 to the skin; and applying a cosmetic other than the film-forming composition for skin, the cosmetic containing one or more oils in an amount of 1 mass % or more, to the area of ​​the skin to which the film-forming composition for skin has been applied.

[0008] The present invention further relates to a film-forming set for skin, comprising: a cosmetic containing at least 1% by mass of one or more oily agents; and the film-forming composition for skin according to claim 1 or 2. Detailed Description of the Invention

[0009] The fibers used in Patent Documents 1 and 2 are both composed of hydrophobic materials, and therefore may not be easily dispersed in an aqueous phase. For example, when the emulsions or compositions described in these documents are applied to a surface to form a coating film, the fibers may aggregate during the drying process of the coating film. As a result, it is difficult to improve the durability of the film formed by drying. Furthermore, when used in combination with any cosmetic product, the composition tends to feel sticky. Therefore, the present invention relates to a film-forming composition for skin that forms a coating film on the skin with good durability and is less likely to cause a sticky feeling when used in combination with a cosmetic product.

[0010] The present invention will be described below based on its preferred embodiments. The present invention relates to a film-forming composition for skin. The film-forming composition for skin of the present invention (hereinafter also simply referred to as "film-forming composition") is a composition applied to the surface of human skin for the purpose of forming a film on the surface of skin. The film is formed on the surface of skin for, but not limited to, cosmetic purposes and for the purpose of maintaining a healthy state of skin, such as moisturizing, protecting the skin from external stimuli, and absorbing and retaining secreted sebum.

[0011] The film-forming composition of the present invention contains a volatile component (hereinafter also referred to as "component (A)") as a constituent thereof. Component (A) is a substance that is volatile in a liquid state and, in relation to the regenerated cellulose contained in the film-forming composition of the present invention, constitutes a dispersed phase. In this specification, a "volatile" component refers to a component with a vapor pressure of 200 Pa or more at 25°C. Component (A) is incorporated for the purposes of facilitating film formation when the film-forming composition of the present invention is used in combination with a cosmetic preparation described below, and suppressing stickiness after application of the composition. In the present invention, the inventors consider "stickiness" to mean a sticky, inseparable feeling, such as tackiness or adhesiveness, but does not impair any associated tactile sensations.

[0012] Examples of component (A) include water, monohydric alcohols, ketones, volatile hydrocarbons, volatile silicones, and amides such as dimethylformamide.

[0013] Examples of monohydric alcohols include chain aliphatic monohydric alcohols having from 1 to 6 carbon atoms and cyclic aliphatic monohydric alcohols having from 4 to 6 carbon atoms. Specific examples of chain aliphatic monohydric alcohols include ethanol, isopropyl alcohol, butyl alcohol, n-propanol, and n-pentanol. These alcohols can be used alone or in combination of two or more.

[0014] Examples of ketones include alkyl ketones having 1 to 6 carbon atoms. Specific examples of alkyl ketones include acetone, methyl ethyl ketone, and methyl isobutyl ketone. These ketones can be used alone or in combination of two or more.

[0015] Specific examples of volatile hydrocarbons include isoparaffins such as isododecane, isodecane, and hydrogenated polyisobutene. These volatile hydrocarbons can be used alone or in combination of two or more.

[0016] Specific examples of volatile silicones include dimethylpolysiloxane (2 cs or less) and cyclic silicones. These volatile silicones can be used alone or in combination of two or more.

[0017] In order to facilitate film formation even when the film-forming composition of the present invention is used in combination with a cosmetic preparation described below and to suppress stickiness after application of the composition, water and a water-soluble organic solvent can be used as component (A). Examples of water-soluble organic solvents include lower monohydric saturated aliphatic alcohols such as ethanol. In order to suppress stickiness, component (A) preferably contains one or more alcohols selected from water and lower monohydric saturated aliphatic alcohols having from 1 to 4 carbon atoms, and particularly preferably contains one or more alcohols selected from water and ethanol.

[0018] The content of component (A) in the film-forming composition of the present invention is preferably 80% by mass or more, more preferably 81.5% by mass or more, and even more preferably 83% by mass or more, from the viewpoint of facilitating film formation when the film-forming composition is used in combination with a cosmetic preparation described below and suppressing stickiness after application of the composition. Furthermore, taking into consideration a realistic blending amount, the content of component (A) is preferably 98% by mass or less, more preferably 97% by mass or less, and even more preferably 96% by mass or less. The content and skeletal structure of component (A) can be determined by specifying and identifying the molecular structure using known techniques such as NMR (nuclear magnetic resonance), chromatography, and IR analysis, or a combination thereof. Furthermore, the content of component (A) can be measured by the above-mentioned measuring means, for example, by measuring the intensity of the portion showing the skeletal structure.

[0019] The film-forming composition of the present invention contains, as a constituent, a polyhydric alcohol (hereinafter also referred to as "component (B)") that is either liquid at 25°C or a sugar alcohol. Component (B) has the effect of plasticizing regenerated cellulose fibers, which are component (C) described below. Therefore, by adjusting the type and amount of component (B) used, the physical properties of the film formed using the film-forming composition of the present invention can be controlled. Although sugar alcohols are solid at 25°C, they can dissolve in water and exhibit the same effect on fibers as polyhydric alcohols that are liquid at 25°C. The solubility of the sugar alcohol is preferably 30% by mass or more, more preferably 45% by mass or more, at 25°C. The inclusion of a sugar alcohol in the film-forming composition of the present invention improves the adhesion of the film formed from the film-forming composition.

[0020] Examples of polyhydric alcohols that are liquid at 25°C include alkylene glycols such as ethylene glycol, propylene glycol, 1,3-propanediol, and 1,3-butylene glycol; polyalkylene glycols such as diethylene glycol, dipropylene glycol, polyethylene glycols and polypropylene glycols having a weight-average molecular weight of 1000 g / mol or less; and glycerins such as glycerin, diglycerin, and triglycerin. Examples of sugar alcohols include maltitol, sorbitol, xylitol, and erythritol. These components (B) can be used alone or in combination of two or more. From the viewpoint of effectively controlling the physical properties of the film formed using the film-forming composition of the present invention, it is preferable to use at least one selected from ethylene glycol, propylene glycol, 1,3-butylene glycol, dipropylene glycol, polyethylene glycols having a weight-average molecular weight of 1000 g / mol or less, glycerin, diglycerin, maltitol, and sorbitol as component (B).

[0021] The content of component (B) in the film-forming composition of the present invention is preferably 0.5% by mass or more, more preferably 0.8% by mass or more, and even more preferably 1% by mass or more, so that the formed film does not feel hard and does not cause discomfort such as a tight feeling. Furthermore, so that the durability of the film does not decrease excessively, the content of component (B) in the film-forming composition of the present invention is preferably 20% by mass or less, more preferably 15% by mass or less, even more preferably 12% by mass or less, and even more preferably 9% by mass or less.

[0022] The film-forming composition of the present invention may further contain, as component (B'), polyethylene glycol (having a weight-average molecular weight of more than 1000 g / mol) that is solid at 25°C. When the film-forming composition of the present invention contains polyethylene glycol that is solid at 25°C, the durability of the film formed from the film-forming composition is improved. The content of polyethylene glycol that is solid at 25°C in component (B') is preferably 0.005% by mass or more, more preferably 0.008% by mass or more, even more preferably 0.01% by mass or more, even more preferably 0.05% by mass or more, even more preferably 0.1% by mass or more, and particularly preferably 1% by mass or more. The content is preferably 4.5% by mass or less, more preferably 3.5% by mass or less, and even more preferably 2.5% by mass or less.

[0023] The film-forming composition of the present invention contains regenerated cellulose fibers (hereinafter also referred to as "component (C)") as a constituent component. In this specification, regenerated cellulose fibers are fibers obtained by dissolving natural cellulose fibers through chemical treatment and then converting them back into cellulose. Regenerated cellulose fibers have the advantage of being well dispersible in the dispersed phase of the film-forming composition of the present invention. Furthermore, they have the advantage of suppressing fiber aggregation, allowing the composition to be uniformly spread upon application. Furthermore, regenerated cellulose fibers have the advantage of being able to stably maintain their fibrous shape in the film-forming composition of the present invention (e.g., not dissolving or deforming). After application to the skin, they can be easily removed by rinsing. Among regenerated cellulose fibers, unmodified cellulose fibers are preferred from the viewpoint of improving the decomposition into the aqueous phase of the film-forming composition of the present invention. Unmodified cellulose fibers are regenerated cellulose fibers in which the hydroxyl group at the C6 position of each glucose unit in the cellulose molecule is not substituted with another substituent. Unmodified cellulose fibers have a high hydroxyl group density and are highly hydrophilic. Furthermore, unmodified cellulose fibers also have the advantage of excellent salt tolerance. Excellent salt resistance is advantageous in that the unmodified cellulose fibers are less susceptible to the effects of metal ions when they are present in the film-forming composition of the present invention.

[0024] The average fiber diameter of the regenerated cellulose fibers is preferably 0.5 μm or more, more preferably 0.6 μm or more, and even more preferably 0.7 μm or more, from the viewpoints of good dispersibility in the composition, ease of fiber network formation, and adhesion of the formed film. Furthermore, the average fiber diameter of the regenerated cellulose fibers is preferably 5 μm or less, more preferably 4.5 μm or less, and even more preferably 4 μm or less, from the viewpoints of film durability, good adhesion of the film, and appropriate size of voids formed between fibers in the film. Furthermore, from the viewpoint of fiber manufacturability, the average fiber diameter of the regenerated cellulose fibers is preferably 3 μm or less, and even more preferably 2 μm or less.

[0025] Regenerated cellulose fibers are produced by dissolving natural products such as pulp or cotton linters in chemicals, chemically extracting plant cellulose, and regenerating it into fibers. These fibers are highly pure chemical fibers in which the hydroxyl group at C6 of each glucose unit in the cellulose molecule is not substituted with other substituents. They can be produced using the viscose method, the cuprammonium method, or the solvent spinning method. For example, when producing regenerated cellulose fibers using the cuprammonium method, the fiber diameter and fiber length of the regenerated cellulose fibers can be adjusted by adjusting the concentration of the cuprammonium cellulose solution, the diameter of the spinning nozzle, and the discharge rate. The raw material for the cellulose fibers used in the film-forming composition for skin of the present invention is not particularly limited as long as it is plant- or animal-derived cellulose. Examples include pulp derived from coniferous or broad-leaved trees, cotton linters, wood flour, and plant cellulose.

[0026] Regenerated cellulose fibers generally have a non-circular cross section, and the fiber diameter of regenerated cellulose fibers refers to the length of the fiber's cross section. The fiber diameter can be measured by observing the regenerated cellulose fibers under a scanning electron microscope (hereinafter also referred to as "SEM") at 2000x or 5000x magnification, randomly selecting 100 fibers from the two-dimensional image, excluding defects (e.g., fiber clumps, fiber intersections), drawing a line perpendicular to the fiber's longitudinal direction, and directly reading the fiber diameter. The average fiber diameter is the arithmetic mean of these measurements. When regenerated cellulose fibers are dispersed in a film, the film-forming composition of the present invention is thinly applied to a substrate and measured by SEM observation.

[0027] One of the characteristics of regenerated cellulose fibers is that their length is within a specific range. Specifically, from the viewpoint of the adhesion of the formed film, the length of the regenerated cellulose fibers is preferably 20 μm or more in terms of average fiber length. To further enhance this advantage, the average fiber length of the regenerated cellulose fibers is more preferably 25 μm or more. Furthermore, from the viewpoint of suppressing entanglement and twisting of the fibers during application of the composition, the average fiber length of the regenerated cellulose fibers is preferably 300 μm or less, more preferably 250 μm or less, even more preferably 200 μm or less, even more preferably 150 μm or less, and particularly preferably 100 μm or less.

[0028] The average fiber length of the regenerated cellulose fibers is preferably within the above range, and the upper limit of the fiber length is preferably 300 μm or less.

[0029] The fiber length of regenerated cellulose fibers can be measured by observing them under an SEM at a magnification of 250 to 750 times depending on the fiber length, randomly selecting 100 fibers from the two-dimensional image, excluding defects (e.g., fiber clumps and fiber intersections), and directly reading their longitudinal lengths. The average fiber length is the arithmetic mean of these measurements.

[0030] Regenerated cellulose fibers having the above-mentioned average fiber length can be obtained by shortening continuous filaments having the above-mentioned average fiber diameter. Examples of fiber shortening methods include cutting, shearing, crushing, pulverizing, disintegrating, or defibrating. Specifically, dry grinding methods such as mechanical vortex grinders and impact crushers such as hammer crushers, jet grinders such as jet mills, media grinders such as ball mills and rod mills, cutter mill grinders and disc mill grinders, as well as media grinders using liquid media and wet grinders using media-less grinders, and combinations of these can be used. A more preferred fiber shortening method involves producing a fiber aggregate, such as a nonwoven fabric, in which regenerated cellulose fibers are entangled, followed by cutting the fiber aggregate to an appropriate size and then grinding it using a mechanical vortex grinder, cutter mill grinder, disc mill grinder, wet high-speed shear media-less grinder, or wet high-pressure shear media-less grinder.

[0031] The regenerated cellulose fibers preferably have a fiber length coefficient of variation (hereinafter also referred to as "CV value") within a specific range, from the viewpoint of successfully forming a fiber network in the film. Specifically, the CV value is preferably 40% or more, more preferably 42% or more, even more preferably 45% or more, from the viewpoint of facilitating the formation of a fiber network, reducing voids between the networks, and improving the film's adhesion to the skin, due to the variation in fiber length. From the viewpoint of further promoting the formation of a network between fibers, the CV value is preferably 50% or more, even more preferably 55% or more. Furthermore, from the viewpoint of improving the storage stability of the film-forming composition of the present invention and improving the film's adhesion due to fiber entanglement, the CV value of the regenerated cellulose fibers is preferably 100% or less, more preferably 95% or less, even more preferably 90% or less, from the viewpoint of improving the storage stability of the film-forming composition of the present invention and improving the film's adhesion due to fiber entanglement. From the viewpoint of suppressing fiber entanglement and improving the formation of a network between fibers, the CV value is preferably 85% or less, even more preferably 80% or less.

[0032] The CV value is calculated by [standard deviation of fiber length] / [average fiber length]×100[%].

[0033] From the viewpoint of forming a strong network in the film and improving the adhesion of the resulting film, the regenerated cellulose fibers preferably have a distribution in which the proportion of fibers with a fiber length of 40 μm or more in the total fiber is 5% or more. From the viewpoint of making this advantage more pronounced, the regenerated cellulose fibers more preferably contain 8% or more of fibers with a fiber length of 40 μm or more, and from the viewpoint of increasing fiber entanglement and further improving the strength of the film, more preferably contain 15% or more, and even more preferably contain 20% or more. From the viewpoint of facilitating the formation of a network in the film, the regenerated cellulose fibers preferably have a distribution in which the proportion of fibers with a fiber length of 40 μm or more is 100% or less, more preferably contain 80% or less, even more preferably contain 60% or less, and even more preferably contain 45% or less.

[0034] The percentage of fibers with a fiber length of 40 μm or more in the regenerated cellulose fibers was determined by adjusting the magnification of the SEM from 200x to 750x so that 20 to 30 fibers fit in one SEM image, depending on the fiber length, and measuring the lengths of all fibers within the image in this state to eliminate arbitrariness. The number of fibers measured was 200 or more.

[0035] The aspect ratio of regenerated cellulose fibers, defined as [average fiber length / average fiber diameter], is preferably 8 or more, more preferably 10 or more, and even more preferably 12 or more, from the viewpoint of the adhesion of the film formed, provided that the average fiber length and average fiber diameter of the regenerated cellulose fibers are within the above-mentioned ranges. Furthermore, from the viewpoint of the uniformity of the film and the resistance to layer aggregation, the aspect ratio of the regenerated cellulose fibers is preferably 200 or less, more preferably 180 or less, even more preferably 150 or less, even more preferably 100 or less, and particularly preferably 50 or less. In this specification, the aspect ratio is not the value for a single fiber, but a value calculated from the average fiber diameter and average fiber length determined according to the above-mentioned measurement method.

[0036] Whether or not a network containing regenerated cellulose fibers is formed in a film formed using the film-forming composition of the present invention can be confirmed by SEM observation. In this specification, a fiber network refers to a state in which fibers dispersed in the film have two or more intersections with each other, thereby defining gaps between the fibers. The gaps between the fibers can hold, for example, a liquid agent, an oil agent, or a cosmetic agent as described below.

[0037] From the viewpoints of the durability of the formed film and the ease of network formation, the content of component (C) in the film-forming composition of the present invention is preferably 0.2% by mass or more, more preferably 0.5% by mass or more, even more preferably 0.7% by mass or more, and even more preferably 1% by mass or more. From the viewpoint of the storage stability of the composition, the content of component (C) in the film-forming composition of the present invention is preferably 10% by mass or less, even more preferably 9% by mass or less, and even more preferably 8% by mass or less. Regarding network formability, in addition to ease of formation, it is desirable that the network be formed evenly throughout, i.e., that the network be uniform. From the viewpoint of such network uniformity, the content of component (C) is preferably 0.7% by mass or more, and particularly preferably 1% by mass or more.

[0038] In the film-forming composition of the present invention, the mass ratio of component (B) to component (C) is preferably within a predetermined range. Specifically, in the film-forming composition of the present invention, the mass ratio (B) / (C) of component (B) to component (C) is preferably 0.1 or more, from the viewpoint of sufficiently plasticizing component (D) so that the film does not feel hard and does not cause discomfort such as a tight feeling. To further enhance this advantage, the mass ratio (B) / (C) is preferably 0.2 or more, more preferably 0.3 or more, and even more preferably 1 or more. Furthermore, to prevent excessive deterioration of the durability of the film, the mass ratio (B) / (C) is preferably 10 or less, more preferably 9 or less, even more preferably 8 or less, and even more preferably 7 or less.

[0039] In the film-forming composition of the present invention, the mass ratio of component (A) to component (C) is preferably within a predetermined range. Specifically, in the film-forming composition of the present invention, the mass ratio (A) / (C) of component (A) to component (C) is preferably 8 or more, more preferably 10 or more, and even more preferably 12 or more, from the viewpoint of improving stickiness suppression performance. Furthermore, the mass ratio (A) / (C) is preferably 400 or less, more preferably 190 or less, and even more preferably 96 or less, from the viewpoint of further improving the durability of the film.

[0040] In the film-forming composition of the present invention, the fibers form a network in the formed film, and in order to improve the durability of the film, the regenerated cellulose fibers of component (C) have an average fiber diameter of ２ / fiber content (μm ２ / % by mass is preferably in the range of 0.05 to 8. The fiber content means the mass % of fibers in the film-forming composition. (Average fiber diameter) ２ / fiber content (μm ２ The value of (wt%) / (mass%) is an index of the cumulative length of the fibers contained in the film-forming composition of the present invention, and a larger value indicates a shorter cumulative length. From the viewpoint of sufficiently forming a uniform fiber network and forming a uniform fiber network, this value is preferably 0.1 or more, more preferably more than 0.2, and even more preferably 0.23 or more. Furthermore, from the viewpoint of ease of production, this value is preferably 7 or less, more preferably 6.5 or less, and even more preferably 6 or less.

[0041] The film-forming composition of the present invention may contain, as the fiber material, in addition to regenerated cellulose fibers, modified cellulose fibers, and fibers other than cellulose fibers, such as thermoplastic fibers, etc. However, from the viewpoint of making the most of the advantages of using regenerated cellulose fibers, it is preferred that the film-forming composition of the present invention contain only regenerated cellulose fibers as the fiber material.

[0042] The film-forming composition of the present invention may contain other components in addition to the above-mentioned components. For example, the film-forming composition of the present invention may contain a nonionic surfactant (hereinafter also referred to as "component (D)"). Component (D) is added for the purpose of improving compatibility with the skin. This enhances the uniformity and durability of the fiber network in the film.

[0043] Examples of component (D) include polyhydric alcohol fatty acid ester-type nonionic surfactants. Examples of polyhydric alcohol fatty acid ester-type nonionic surfactants include sucrose fatty acid esters, glycerin fatty acid esters, polyglycerin fatty acid esters, mono-fatty acid sorbitan, polyoxyethylene sorbitan fatty acid esters, polyoxyethylene sorbitan fatty acid esters, polyoxyethylene glycerin fatty acid esters, polyoxyethylene fatty acid esters, and polyoxyethylene hydrogenated castor oil. These nonionic surfactants can be used alone or in combination of two or more.

[0044] From the viewpoint of good spreadability and smoothness upon application, the content of component (D) in the film-forming composition of the present invention is preferably 5% by mass or less, more preferably 4% by mass or less, and even more preferably 3% by mass or less. Furthermore, from the viewpoint of improving compatibility with the skin, the content of component (D) in the film-forming composition of the present invention is preferably 0.05% by mass or more, more preferably 0.07% by mass or more, and even more preferably 0.1% by mass or more. The content and skeletal structure of component (D) can be determined by specifying and identifying the molecular structure using known techniques such as NMR (nuclear magnetic resonance), chromatography, and IR analysis, or a combination thereof. Furthermore, the content of component (D) can be measured by the above-mentioned measuring means, for example, by measuring the intensity of the portion showing the skeletal structure.

[0045] The film-forming composition of the present invention may contain a non-volatile oil (hereinafter also referred to as "component (E)"). Component (E) is a substance that is non-volatile in its liquid state. In this specification, a "non-volatile" component refers to a component with a vapor pressure of 30 Pa or less at 25°C. Component (E) is incorporated for the purpose of improving the adhesion of component (C), the regenerated cellulose fiber, in the film formed on the skin when the film-forming composition of the present invention is applied to the skin.

[0046] Examples of component (E) include oils such as ester oils, non-volatile hydrocarbon oils, non-volatile silicone oils, ether oils, and fluorine oils. One or more selected from these oils may be contained.

[0047] The ester oil may be one or more selected from esters of straight-chain or branched-chain fatty acids and straight-chain or branched-chain alcohols or polyhydric alcohols, or triglycerin fatty acid esters (triglycerides).Specifically, 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, isononyl isononanoate, isotridecyl isononanoate, cholesteryl 12-hydroxystearate, ethylene glycol di-2-ethylhexanoate, dipentaerythritol, methylparaben ... Lithritol fatty acid ester, n-alkyl glycol monoisostearate, neopentyl glycol dicaprate, diisostearyl malate, glycerin di-2-heptylundecanoate, trimethylolpropane tri-2-ethylhexanoate, trimethylolpropane triisostearate, pentaerythrityl tetra-2-ethylhexanoate, glyceryl tri-2-ethylhexanoate, trimethylolpropane triisostearate, cetyl 2-ethylhexanoate, 2-ethylhexyl palmitate, naphthalene dimethicone Diethylhexyl benzoate, C12-15 alkyl benzoate, cetearyl isononanoate, caprylic / capric triglyceride, butylene glycol dicaprylate / caprate, glyceryl trilaurate, glyceryl trimyristate, glyceryl tripalmitate, glyceryl triisostearate, glyceryl tri-2-heptylundecanoate, glyceryl tribehenate, glyceryl cocoate, methyl ester of castor oil fatty acids, oleyl oleate, 2-heptylundecyl palmitate One or more ester oils may be used selected from the group consisting of diisobutyl adipate, N-lauroyl-L-glutamic acid 2-octyldodecyl ester, di-2-heptylundecyl adipate, ethyl laurate, di-2-ethylhexyl sebacate, 2-hexyldecyl myristate, 2-hexyldecyl palmitate, 2-hexyldecyl adipate, diisopropyl sebacate, di-2-ethylhexyl succinate, triethyl citrate, ethylhexyl paramethoxycinnamate, tripropylene glycol dipivalate, etc. In order to enhance the feel when using the film-forming composition of the present invention, it is preferable to use an ester oil that is liquid at 25°C.

[0048] The ether oil may be one or more selected from alkyl-1,3-dimethylbutyl ethers such as cetyl dimethyl butyl ether, ethylene glycol dioctyl ether, glycerol monooleyl ether, dicaprylyl ether, etc. In order to enhance the feel of the film-forming composition of the present invention when used, it is preferable to use an ether oil that is liquid at 25°C.

[0049] The non-volatile hydrocarbon oil may be one or more selected from liquid hydrocarbon oils that are liquid at 20° C., such as liquid paraffin, squalane, squalene, polyisobutene (pentamer or higher), and liquid isoparaffin. In order to improve the feel of the film-forming composition of the present invention when used, it is preferable to use a non-volatile hydrocarbon oil that is liquid at 25° C.

[0050] Examples of the non-volatile silicone oil include dimethicone (dimethylpolysiloxane (5 cs or more)), polyether-modified silicone, amino-modified silicone, carboxy-modified silicone, methylphenylpolysiloxane, fatty acid-modified silicone, alcohol-modified silicone, aliphatic alcohol-modified silicone, epoxy-modified silicone, fluorine-modified silicone, and alkyl-modified silicone, and one or more selected from these may be used. In order to improve the usability of the film-forming composition of the present invention, it is preferable to use a non-volatile silicone oil that is liquid at 25°C.

[0051] The fluorine oil may be one or more selected from the group consisting of perfluorodecalin, perfluoroadamantane, perfluorobutyltetrahydrofuran, perfluorooctane, perfluorononane, perfluoropentane, perfluorodecane, and perfluoropolyether. In order to improve the usability of the film-forming composition of the present invention, it is preferable to use a fluorine oil that is liquid at 25°C.

[0052] In order to improve the usability of the film-forming composition of the present invention, it is particularly preferred that component (E) contain one or more oils selected from the group consisting of ester oils that are liquid at 25°C, non-volatile hydrocarbon oils that are liquid at 25°C, and non-volatile silicone oils that are liquid at 25°C.

[0053] The content of component (E) in the film-forming composition of the present invention is preferably 3% by mass or less, more preferably 2.5% by mass or less, and even more preferably 2% by mass or less, from the viewpoint of facilitating retention of the cosmetic in the film when the composition is used in combination with the cosmetic described below. Furthermore, from the viewpoint of improving the dispersibility of component (C) in the film-forming composition and the durability of the formed film, the content of component (E) in the film-forming composition of the present invention is preferably 0.1% by mass or more, more preferably 0.2% by mass or more. The content and skeletal structure of component (E) can be determined by specifying and identifying the molecular structure using known techniques such as NMR (nuclear magnetic resonance), chromatography, and IR analysis, or a combination thereof. Furthermore, the content of component (E) can be measured by the above-mentioned measuring means, for example, by measuring the intensity of the measured value of the portion showing the skeletal structure.

[0054] In addition to the above-described components, the film-forming composition of the present invention may contain optional components as appropriate, provided that the effects of the present invention are not impaired. Examples of optional components include ultraviolet absorbers, water-soluble polymers, pH adjusters, disinfectants, anti-inflammatory agents, preservatives such as phenoxyethanol, thickeners such as xanthan gum, colorants, chelating agents, whitening agents, antiperspirants, insect repellents, physiologically active ingredients, salts, antioxidants, and powder components. These optional components can be used alone or in combination of two or more. These optional components can be included as needed based on the properties required of the film-forming composition of the present invention. When optional components are included, the total amount of the optional components in the composition is preferably 0.1% by mass or more and 10% by mass or less.

[0055] Examples of powder components include color pigments, extender pigments, pearl pigments, and organic powders. Examples of color pigments include inorganic color pigments, organic color pigments, and organic dyes. Examples of color pigments include, but are not limited to, titanium oxide, red iron oxide, yellow iron oxide, and black iron oxide. Lustrous pigments such as titanium mica, iron oxide-coated mica, titanium iron oxide-coated mica, titanium organic pigment-coated mica, and aluminum powder can also be used or blended. The average particle size of the powder component is preferably greater than 0.1 μm and less than 200 μm, more preferably greater than 0.1 μm and less than 50 μm, even more preferably 0.2 μm to 20 μm, and even more preferably 0.5 μm to 10 μm, in order to ensure uniform adhesion to the skin's ridges, grooves, and pores and provide a natural cosmetic feel. When the powder component has been hydrophobized or hydrophilized, the average particle size, content, or blending amount of the powder component refers to the average particle size and content, respectively, including the agent used for the hydrophobization or hydrophilization treatment. From the viewpoint of ensuring that the effects of the present invention are achieved, the content or blending amount of powder components contained in the film-forming composition of the present invention is preferably 3.5% by mass or less, more preferably 2% by mass or less, even more preferably 1% by mass or less, and even more preferably 0% by mass. In particular, the content or blending amount of powder components having an average particle size of more than 100 μm is preferably 3.5% by mass or less, more preferably 2% by mass or less, even more preferably 1% by mass or less, and even more preferably 0% by mass. In the present invention, the average particle size is defined as the volume cumulative particle size D at 50% cumulative volume measured by a laser diffraction / scattering method. ５０ The shape of the powder component used in the present invention may be, for example, spherical, flaky, rod-like, spindle-like, needle-like, or irregular, and any shape can be used as long as the average particle size is within the above range.

[0056] The film-forming composition of the present invention can be produced by mixing the above-mentioned components according to a conventional method, adjusting the temperature as necessary. In the film-forming composition of the present invention produced in this manner, it is preferable that the regenerated cellulose fiber (component (C)) is mainly present in the dispersed phase of the volatile component (component (A)). When the film-forming composition of the present invention contains, for example, a nonionic surfactant (component (D)) and a nonvolatile oil (component (E)), the composition is preferably an oil-in-water emulsion. In this case, it is preferable that the regenerated cellulose fiber (component (C)) is mainly present in the aqueous phase. However, this does not prevent the regenerated cellulose fiber (component (C)) from being present in the oil phase.

[0057] The film-forming composition of the present invention can form a uniform film on human skin by applying it. Furthermore, in this film, a fiber network is formed due to the volatilization and disappearance of volatile components. As a result, the resulting film has excellent uniformity and adhesion. In particular, the regenerated cellulose fibers contained in the film-forming composition of the present invention have good dispersibility in the dispersed phase. Furthermore, since regenerated cellulose fibers are less likely to aggregate, they can be spread uniformly during application of the composition. As a result, a fiber network is uniformly formed in the film, improving the durability of the film. Furthermore, stickiness is suppressed.

[0058] The film-forming composition of the present invention can be applied to the skin by, for example, applying it with the fingers, spraying it, applying it with a tool such as a roller or sponge, or applying a stick-shaped solid cosmetic. The film formed on the surface of the skin has good uniformity, excellent adhesion and durability, and preferably good transparency. The thickness of the film depends on the amount applied, but is within the range of normal use (coating basis weight of 1 to 3 mg / cm). ２ The thickness of the coating can be measured by observing the coating formed on a substrate using the coating-forming composition of the present invention with an optical microscope, an electron microscope, or the like.

[0059] The film-forming composition of the present invention is less likely to cause a sticky feeling even when used in combination with a cosmetic other than the film-forming composition (hereinafter also referred to as "cosmetic a"). This is thought to be because cosmetic a (its non-volatile components) are retained in the fiber network within the film. Cosmetic a has a different composition from the film-forming composition of the present invention, and examples thereof include skin care cosmetics such as serums and various emulsions, topical skin preparations containing medicinal ingredients, cosmetic compositions such as liquid foundations and tinted emulsions, and other personal compositions used on the skin. "Skin care cosmetics" refer to agents that deliver active ingredients to the skin and maintain the health of the skin by moisturizing or the like. When used in combination with the film-forming composition of the present invention, cosmetic a is preferably a skin care cosmetic, from the viewpoint of effectively forming a film retaining cosmetic a. Below, a method for forming a film on the skin surface by using the film-forming composition of the present invention in combination with cosmetic a will be described. First, cosmetic a is applied to the skin.

[0060] Cosmetic a of this embodiment can be any commonly used cosmetic without any particular limitations. When cosmetic a is retained in the fiber network in the film, from the viewpoint of maintaining a healthy state of the skin through moisturizing or the like, cosmetic a preferably contains one or more oil agents X. Examples of oil agent X include ester oils, ether oils, hydrocarbon oils, and silicone oils. These oil agents can be used alone or in combination of two or more. Specific examples of ester oils, ether oils, hydrocarbon oils, and silicone oils include those used as component (E) described above. Cosmetic a can also be used in which oil agent X is a solid fat that is solid at 25°C. When the film-forming composition of the present invention contains component (E) that is a non-volatile oil agent, oil agent X and component (E) may contain the same or different components. When the film-forming composition of the present invention is used in combination with cosmetic a, from the viewpoint of effectively maintaining a healthy state of the skin through moisturizing or the like, it is more preferable that oil agent X contains a non-volatile oil. However, the oil X may contain a volatile oil.

[0061] From the viewpoint of improving the adhesion and appearance of the formed film, the content of oil X in cosmetic a is preferably 1% by mass or more, more preferably 1.5% by mass or more, and even more preferably 2% by mass or more. Furthermore, from the viewpoint of the durability of the formed film, the content of oil X in cosmetic a is preferably 40% by mass or less, and even more preferably 35% by mass or less. The content and skeletal structure of oil X can be determined by specifying and identifying the molecular structure using known techniques such as NMR (nuclear magnetic resonance), chromatography, and IR analysis, or a combination thereof. Furthermore, the content of oil X can be measured by the above-mentioned measuring means, for example, by the intensity of the measured value of the portion showing the above-mentioned skeletal structure.

[0062] The cosmetic preparation a of this embodiment can be applied to the skin by the above-described method for applying the film-forming composition of the present invention. From the viewpoint of improving the adhesion and appearance of the formed film, the amount of cosmetic preparation a applied to the skin is set to a basis weight of 0.1 mg / cm. ２ It is preferable that the concentration is 0.2 mg / cm or more, and more preferably 0.2 mg / cm ２ More preferably, it is 0.4 mg / cm ２ In order to make it easier for cosmetic material A to be retained in the fiber network in the film, the amount of cosmetic material A to be applied to the skin is set to a basis weight of 15 mg / cm. ２ It is preferably 10 mg / cm or less, and more preferably 10 mg / cm ２ More preferably, it is 7 mg / cm or less. ２ and even more preferably 5 mg / cm ２ The following is the result.

[0063] Next, the film-forming composition of the present invention is applied to the area of ​​the skin where cosmetic product a has been applied. The film-forming composition of the present invention contains a relatively large amount of the volatile component (A), and this procedure causes component (A) to volatilize and disappear, while the non-volatile components derived from cosmetic product a are retained within the formed fiber network. As a result, the composition is less likely to feel sticky on the skin to which it has been applied. Furthermore, by retaining cosmetic product a within the fiber network in the film, it is possible to maintain the health of the skin by moisturizing it, etc.

[0064] When used in combination with cosmetic preparation A, the film-forming composition of the present invention can be applied to the skin by the above-mentioned application methods. In this case, from the viewpoint of improving the adhesion and appearance of the formed film, the amount of the film-forming composition of the present invention applied to the skin is set to a basis weight of 0.1 mg / cm. ２ It is preferable that the concentration is 0.3 mg / cm or more, and more preferably 0.3 mg / cm ２ More preferably, it is 0.5 mg / cm ２ In order to improve the applicability, the amount of the film-forming composition of the present invention to be applied to the skin is set to a basis weight of 12 mg / cm. ２ It is preferably 10 mg / cm or less, and more preferably 10 mg / cm ２ More preferably, it is 8 mg / cm or less. ２ The following is the result.

[0065] In the above explanation, the case where cosmetic a is applied to the skin and then the film-forming composition of the present invention is applied has been described, but the desired effect is also fully achieved when the composition is applied to the skin and then cosmetic a is applied. Similarly, the desired effect is also fully achieved when cosmetic a and the film-forming composition of the present invention are applied to the skin simultaneously. In either case, the type of oil X contained in cosmetic a and the content of said oil X can be the same as described above. Furthermore, the amount of the film-forming composition of the present invention applied and the amount of cosmetic a applied can also be the same as described above.

[0066] From the viewpoints of facilitating the combined use of cosmetic preparation a and the film-forming composition of the present invention, suppressing stickiness, and facilitating the maintenance of healthy skin, it is preferable to use a film-forming set for skin that includes cosmetic preparation a and the composition. As described above, cosmetic preparation a that contains 1% by mass or more of one or more oils can be suitably used.

[0067] In relation to the above-described embodiment, the present invention further discloses the following film-forming composition for skin. <1> A film-forming composition for skin containing the following components (A) to (C): (A) 80% by mass or more of a volatile component; (B) a polyhydric alcohol that is liquid at 25°C or is a sugar alcohol; and (C) regenerated cellulose fibers having an average fiber diameter of 0.5 μm or more and 5 μm or less and an average fiber length of 20 μm or more and 300 μm or less.

[0068] <2> The film-forming composition for skin according to <1>, wherein the content of component (C) is preferably 0.5% by mass or more, more preferably 0.7% by mass or more. <3> The film-forming composition for skin according to <1> or <2>, further comprising component (D) a nonionic surfactant. <4> The film-forming composition for skin according to <3>, wherein component (D) contains a polyhydric alcohol fatty acid ester-type nonionic surfactant. <5> The film-forming composition for skin according to <3> or <4>, wherein the content of component (D) is preferably 0.05% by mass or more and 5% by mass or less. <6> The film-forming composition for skin according to any one of <1> to <5>, further comprising component (E) a non-volatile oil. <7> The film-forming composition for skin according to <6>, wherein the component (E) preferably contains one or more oils selected from ester oils, non-volatile hydrocarbon oils, non-volatile silicone oils, ether oils, and fluorinated oils, and more preferably contains one or more oils selected from ester oils that are liquid at 25°C, non-volatile hydrocarbon oils that are liquid at 25°C, and non-volatile silicone oils that are liquid at 25°C.

[0069] <8> The film-forming composition for skin according to <6> or <7>, wherein the content of the component (E) is preferably 0.1% by mass or more and 3% by mass or less. <9> The film-forming composition for skin according to any one of <1> to <8>, wherein the mass ratio (B) / (C) of the component (B) to the component (C) is preferably 0.1 or more and 10 or less. <10> The film-forming composition for skin according to any one of <1> to <9>, wherein the mass ratio (B) / (C) of the component (B) to the component (C) is more preferably 1 or more and 8 or less. <11> The film-forming composition for skin according to any one of <1> to <10>, wherein the mass ratio (A) / (C) of the component (A) to the component (C) is preferably 8 or more and 400 or less, more preferably 10 or more and 190 or less. <12> The film-forming composition for skin according to any one of <1> to <11>, wherein the coefficient of variation of the fiber length of the component (C) regenerated cellulose fibers is preferably 40% or more and 100% or less. <13> The film-forming composition for skin according to any one of <1> to <12>, wherein the coefficient of variation of the fiber length of the component (C) regenerated cellulose fibers is more preferably 55% or more and 80% or less. <14> The film-forming composition for skin according to any one of <1> to <13>, wherein the aspect ratio of the component (C) defined by the average fiber length / average fiber diameter is preferably 8 or more and 200 or less.

[0070] <15> (Average fiber diameter) of the component (C) ２ / fiber content (μm ２<16> The film-forming composition for skin according to any one of <1> to <15>, wherein the (wt%) is preferably 0.05 or more and 8 or less, more preferably more than 0.2 and 7 or less, and even more preferably 0.23 or more and 7 or less. <16> The film-forming composition for skin according to any one of <1> to <15>, wherein the component (A) preferably contains one or more selected from water and lower monohydric saturated aliphatic alcohols having from 1 to 4 carbon atoms, and more preferably contains one or more selected from water and ethanol. <17> The film-forming composition for skin according to any one of <1> to <16>, wherein the content of the component (B) is preferably 0.5% by mass or more and 20% by mass or less. <18> The film-forming composition for skin according to any one of <1> to <17>, further containing component (B') polyethylene glycol that is solid at 25°C. <19> The film-forming composition for skin according to <18>, wherein the content of the component (B′) is preferably 0.005% by mass or more and 2.5% by mass or less.

[0071] <20> The film-forming composition for skin according to any one of <1> to <19>, wherein the content of powder components having an average particle size of more than 100 μm is preferably 3.5% by mass or less, more preferably 1% by mass or less, and even more preferably 0% by mass. <21> The film-forming composition for skin according to any one of <1> to <20>, wherein the average fiber diameter of component (C) is preferably 0.7 μm or more and 2 μm or less. <22> The film-forming composition for skin according to any one of <1> to <21>, wherein the average fiber length of component (C) is preferably 20 μm or more and 150 μm or less. <23> A method for forming a film on the surface of skin, comprising the steps of applying to skin a cosmetic other than the film-forming composition for skin according to any one of <1> to <22>, which contains one or more oils at 1% by mass or more, and applying the film-forming composition for skin to the area of ​​the skin where the cosmetic has been applied. <24> A method for forming a film on the surface of skin, comprising the steps of: applying to skin the film-forming composition for skin according to any one of <1> to <22>; and applying to the area of ​​the skin to which the film-forming composition for skin has been applied a cosmetic preparation containing one or more oily agents at 1% by mass or more and other than the film-forming composition for skin. <25> A film-forming set for skin, comprising: a cosmetic preparation containing preferably 1% by mass or more of one or more oily agents; and the film-forming composition for skin according to any one of <1> to <22>.

[0072] The present invention will be described in more detail below with reference to examples. However, the scope of the present invention is not limited to such examples. Unless otherwise specified, "%" means "% by mass."

[0073] Examples 1 to 10: Compositions were obtained by blending the components shown in Table 1 in the proportions (mass%) shown in the table. The resulting compositions were evaluated as follows. The results are shown in Table 1. In each example, the average fiber diameter, average fiber length, and CV value of the regenerated cellulose fibers were adjusted as follows during the production process of the regenerated cellulose fibers. [Preparation of Cellulose Fibers] Cotton linter pulp was dissolved in a cuprammonium solution to prepare a cuprammonium cellulose solution with a cellulose concentration of 5.0 mass%, copper concentration of 1.8 mass%, and ammonia concentration of 5.5 mass%. This cuprammonium cellulose solution was filtered through a sintered filter with an average pore size of 5 μm to remove foreign matter. A spinning nozzle with discharge holes with a hole diameter of 0.3 mm, 180 holes, and a hole spacing of 1.1 mm was used, and the cuprammonium cellulose solution was discharged from the spinneret into warm water at 20°C. The resulting blue yarn was stretched and deammonified using a flow-down tension spinning method. Hot water at 50°C was poured into a semicircular, inclined trough located 20 cm below the funnel outlet, and the blue yarn and hot water were separated by pouring them into a plastic net. The blue yarn was thoroughly decoppered by showering with 10% by mass sulfuric acid. The sulfuric acid was then thoroughly washed away with pure water, yielding wet, continuous cellulose fibers. The resulting continuous cellulose fibers were diluted with pure water to prepare an aqueous suspension with a cellulose concentration of 1.0% by mass. 500 ml of this aqueous suspension was placed in a mixer (Extreme Mill, MX-1200XT, manufactured by AS ONE Corporation) and processed for 5 minutes. The cellulose fibers were further suspended in 10% by mass sulfuric acid to a concentration of 0.1% by mass. This solution was heated to 70°C and stirred with a magnetic stirrer for 30 minutes, after which the sulfuric acid was washed away with pure water to obtain easily fibrillated cellulose fibers. The resulting fibrillation-promoting cellulose fibers were diluted with pure water to prepare an aqueous suspension with a cellulose concentration of 0.5% by mass. This aqueous suspension was then subjected to five micronization treatments using a high-pressure homogenizer (NS015H manufactured by Nia Sorobi) at an operating pressure of 100 MPa to prepare shortened regenerated cellulose fibers.

[0074] Comparative Example 1: A composition was obtained by using acrylic resin fibers instead of regenerated cellulose fibers and blending the components shown in Table 1 in the proportions (mass %) shown in the same table. The obtained composition was evaluated as follows. The results are shown in Table 1.

[0075] Comparative Example 2: A composition was obtained by using cellulose nanofibers (CNF) instead of regenerated cellulose fibers and blending the components shown in Table 1 in the proportions (mass %) shown in the same table. The obtained composition was evaluated as follows. The results are shown in Table 1.

[0076] Comparative Example 3 A composition was obtained by blending the components shown in Table 1 in the proportions (% by mass) shown in the same table. In this comparative example, component (C) was not blended. The resulting composition was evaluated as follows. The results are shown in Table 1.

[0077] Comparative Example 4 A composition was obtained by blending the components shown in Table 1 in the proportions (mass %) shown in the same table. In this comparative example, component (B) was not blended. The resulting composition was evaluated as follows. The results are shown in Table 1.

[0078] [Comparative Examples 5 and 6] Compositions were obtained by blending the components shown in Table 1 in the proportions (mass %) shown in the same table. The obtained compositions were evaluated as follows. The results are shown in Table 1.

[0079] [Durability of the film] The film-forming composition was applied to a glass substrate at a thickness of 2 mg / cm. ２ After application and drying for 15 minutes, the coating film was rubbed with a finger cot attached to a cotton cloth at a load of 20 to 50 gf up to 10 times, and the presence or absence of peeling of the film was evaluated according to the following criteria: 5: No peeling; 4: Peeling occurred after 8 to 9 tries; 3: Peeling occurred after 6 to 7 tries; 2: Peeling occurred after 4 to 5 tries; 1: Peeling occurred after 1 to 3 tries.

[0080] [Suppression of stickiness] A cosmetic (the cosmetic contains 30.6% by mass of oil. The cosmetic contains 3.6% by mass of hydrocarbon oil, 4% by mass of ester oil, and 12.5% ​​by mass of silicone oil, respectively. The cosmetic contains 20.6% by mass of oil that is liquid at 25°C, and 10% by mass of solid fat. Note that solid fat includes not only solids such as powders, but also non-fluid pastes. Curel (registered trademark) medicated cream, manufactured by Kao Corporation) was applied at a concentration of 2 mg / cm to the forearm of a specialist panelist. ２ After 15 minutes, the film-forming composition was applied to the applied area at a rate of 2 mg / cm. ２ The felt was applied in layers. After 15 minutes, 15 to 20 pieces of felt cut into 4 mm squares or less were scattered along the skin surface, and the area was pressed at 1000 gf for 5 seconds. Immediately after this, the forearm was inverted so that the applied area faced downward, and the number of felt pieces remaining on the forearm was counted. The number of felt pieces remaining on the forearm after inverting it relative to the number of felt pieces initially placed on the forearm was taken as the felt remaining rate. ◎: Felt remaining rate is less than 20%. ○: Felt remaining rate is 40% or more and less than 60%. △: Felt remaining rate is 20% or more and less than 40%. ×: Felt remaining rate is 60% or more and less than 80%.

[0081] [Network Formability] The film-forming composition was applied to black artificial leather at a rate of 2 mg / cm. ２ After application and drying overnight, the state of the network was observed with an SEM (magnification 100-250) and judged based on the following criteria: <Judgment> ◎: A fiber network is formed densely and uniformly. ○: A fiber network is formed uniformly. △: A fiber network is formed, but there are some areas where it is not formed. (Or there are areas where individual fibers exist separately.) ×: A fiber network is not formed in most areas, or no fiber network is observed.

[0082]

[0083] As is clear from the results shown in Table 1, the films formed from the compositions obtained in the examples were highly durable and suppressed from becoming sticky.

[0084] The film-forming composition for skin of the present invention forms a coating film on the skin that has good durability, and when used in combination with other cosmetics containing oils, it can suppress sticky feeling.

Claims

1. A film-forming composition for skin containing the following components (A) to (C): (A) 80% by mass or more of a volatile component; (B) a polyhydric alcohol that is liquid at 25°C or is a sugar alcohol; and (C) regenerated cellulose fibers having an average fiber diameter of 0.5 μm or more and 5 μm or less and an average fiber length of 20 μm or more and 300 μm or less.

2. The film-forming composition for skin according to claim 1, further comprising a nonionic surfactant.

3. The film-forming composition for skin according to claim 1 or 2, further comprising a non-volatile oil.

4. A film-forming composition for skin according to claim 1 or 2, wherein the mass ratio (B) / (C) of component (B) to component (C) is 0.1 or more and 10 or less.

5. A film-forming composition for skin according to claim 1 or 2, wherein the coefficient of variation of the fiber length of component (C), regenerated cellulose fiber, is 40% or more and 100% or less.

6. The film-forming composition for skin according to claim 1 or 2, wherein the aspect ratio of component (C), defined as average fiber length / average fiber diameter, is 8 or more and 200 or less.

7. (Average fiber diameter) of the component (C) ２ / fiber content (μm ２ 3. The film-forming composition for skin according to claim 1, wherein the % by mass of the composition is 0.05 or more and 8 or less.

8. A method for forming a film on the surface of skin, comprising the steps of: applying to the skin a cosmetic other than the film-forming composition for skin according to claim 1 or 2, which contains one or more oils at 1% by mass or more; and applying the film-forming composition for skin to the area of ​​the skin where the cosmetic has been applied.

9. A method for forming a film on the surface of skin, comprising the steps of: applying the film-forming composition for skin according to claim 1 or 2 to the skin; and applying a cosmetic other than the film-forming composition for skin, the cosmetic containing one or more oils in an amount of 1% by mass or more, to the area of ​​the skin to which the film-forming composition for skin has been applied.

10. A skin film-forming set comprising: a cosmetic containing 1% by mass or more of one or more oils; and the skin film-forming composition according to claim 1 or 2.

Images