Film-forming composition for skin

Abstract

This film-forming composition for skin contains the following components (A) to (E). 3 mass% to 20 mass% of a non-volatile oil (A) A surfactant (B) having a melting point of 35°C or lower A polyhydric alcohol (C) that is liquid at 25°C or a sugar alcohol Water (D) Regenerated cellulose fibers (E) having an average fiber diameter of 0.5 μm to 5 μm and an average fiber length of 20 μm to 300 μm The variation coefficient value of the fiber lengths of the regenerated cellulose fibers (E) is preferably 40% to 100%.

Description

Skin film-forming composition

[0001] The present invention relates to a film-forming composition 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 / 196401A1US2022 / 233410A1

[0005] The present invention relates to a film-forming composition for skin containing the following components (A) to (E): (A) a non-volatile oil in an amount of 3% by mass or more and 20% by mass or less; (B) a surfactant having a melting point of 35°C or less; (C) a polyhydric alcohol that is liquid at 25°C or is a sugar alcohol; (D) water; and (E) 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. Detailed Description of the Invention

[0006] Because the fibers used in Patent Documents 1 and 2 are both composed of hydrophobic materials, it is not easy to achieve good dispersion in an aqueous phase. On the other hand, even if the fibers are made of hydrophilic materials, it is not easy to achieve good dispersion in an aqueous phase. If the fibers have insufficient dispersibility in an aqueous phase, for example, when the emulsions and compositions described in these documents form a coating film on the surface to be applied, the fibers are likely to aggregate during the drying process. As a result, the durability, appearance, and feel of the coating formed by drying are reduced. Therefore, the present invention relates to a film-forming composition for skin that improves fiber dispersibility and improves the durability, appearance, and feel of the coating.

[0007] 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 purposes such as, but not limited to, cosmetic purposes, moisturizing, protecting the skin from external stimuli, and maintaining the health of the skin by absorbing and retaining secreted sebum.

[0008] The film-forming composition of the present invention contains a non-volatile oil (hereinafter also referred to as "component (A)") as a constituent component. Component (A) is a material that constitutes the oil phase in relation to the water contained in the film-forming composition of the present invention. In this specification, "non-volatile oil" refers to an oil that has a mass loss of 1% or less after 1 g of a sample to be measured is spread on a 48 mm diameter glass petri dish and left at 25°C and normal pressure for 24 hours. Component (A) is added for the purposes of increasing the durability of the fiber network in the formed film and increasing the transparency of the film.

[0009] Examples of component (A) include ester oils, hydrocarbon oils, ether oils, higher alcohols, silicone oils, fluorine oils, and fatty acids. 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. The content of component (A) can also be measured by the above-mentioned measurement, for example, by the intensity of the measured value of the portion showing the skeletal structure.

[0010] As the ester oil, for example, one or more types selected from an ester of a straight-chain or branched-chain fatty acid and a straight-chain or branched-chain alcohol or polyhydric alcohol, and a triglycerin fatty acid ester (triglyceride) can be used.Specifically, these include isopropyl myristate, cetyl octanoate, octyldodecyl myristate, isopropyl palmitate, butyl stearate, hexyl laurate, myristyl myristate, decyl oleate, hexyldecyl dimethyloctanoate, cetyl lactate, myristyl lactate, lanolin acetate, isocetyl stearate, isocetyl isostearate, cholesteryl 12-hydroxystearate, ethylene glycol di-2-ethylhexanoate, dipentaerythritol fatty acid esters, and monoisostearin. N-Alkyl Glycol Dicaprate, 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, Diethylhexyl Naphthalenedicarboxylate, Benzoic Acid (Carbon (Number 12-15) Alkyl, Cetearyl Isononanoate, Tri(Caprylic / Capric) Glycerin, (Dicaprylic / Capric) Butylene Glycol, Glyceryl Trilaurate, Glyceryl Trimyristate, Glyceryl Tripalmitate, Glyceryl Triisostearate, Glyceryl Tri-2-heptylundecanoate, Glyceryl Tribehenate, Glyceryl Cocoate, Castor Oil Fatty Acid Methyl Ester, Oleyl Oleate, 2-Heptylundecyl Palmitate, Diisobutyl Adipate, N- Examples of suitable ester oils include 2-octyldodecyl lauroyl-L-glutamate, 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, 2-ethylhexyl paramethoxycinnamate, and tripropylene glycol dipivalate, and one or more selected from these may be used. In order to enhance the feel upon use of the composition of the present invention, it is preferable to use an ester oil that is liquid at 25°C.

[0011] Examples of hydrocarbon oils include hydrocarbon oils that are liquid at 25°C, such as liquid paraffin, squalane, squalene, n-octane, n-heptane, cyclohexane, light isoparaffin, and liquid isoparaffin, and hydrocarbon oils that are solid or semi-solid at 20°C, such as petrolatum, ceresin, paraffin wax, microcrystalline wax, ozokerite, hydrogenated polyisobutene, polyethylene wax, and polyolefin wax, and one or more selected from these may be used. In order to improve the feel when using the composition of the present invention, it is preferable to use a hydrocarbon oil that is liquid at 25°C.

[0012] Examples of ether oils include alkyl-1,3-dimethylbutyl ethers such as cetyl dimethyl butyl ether, ethylene glycol dioctyl ether, glycerol monooleyl ether, dicaprylyl ether, etc., and one or more selected from these may be used. In order to improve the feel when using the composition of the present invention, it is preferable to use an ether oil that is liquid at 25°C.

[0013] Examples of higher alcohols include higher alcohols having 12 to 22 carbon atoms. As the higher alcohol having 12 to 22 carbon atoms, it is preferable to use an aliphatic alcohol, and it is particularly preferable to use a straight-chain aliphatic alcohol and / or a saturated aliphatic alcohol. It is particularly preferable to use a straight-chain saturated aliphatic alcohol. In order to improve the usability of the composition of the present invention, it is preferable to use a higher alcohol that is liquid at 25°C.

[0014] Specific examples of higher alcohols having 12 to 22 carbon atoms include saturated aliphatic monohydric alcohols such as myristyl alcohol, cetyl alcohol, stearyl alcohol, isostearyl alcohol, oleyl alcohol, arachidyl alcohol, and behenyl alcohol. These higher alcohols can be used alone or in combination of two or more.

[0015] Examples of silicone oils include dimethicone (dimethylpolysiloxane), diphenylsiloxyphenyl trimethicone, 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, cyclic silicone, and alkyl-modified silicone, and one or more selected from these can be used. In order to enhance the feel of the composition of the present invention when used, it is preferable to use a silicone oil that is liquid at 25°C. Examples of fluorinated oils include perfluorodecalin, perfluoroadamantane, perfluorobutyltetrahydrofuran, perfluorooctane, perfluorononane, perfluoropentane, perfluorodecane, perfluorododecane, and perfluoropolyether, and one or more selected from these can be used. In order to enhance the feel of the composition of the present invention when used, it is preferable to use a fluorinated oil that is liquid at 25°C.

[0016] The fatty acid may be, for example, one or more selected from linear saturated fatty acids, branched saturated fatty acids, and linear unsaturated fatty acids. Examples of linear saturated fatty acids include linear saturated fatty acids having 14 or more carbon atoms, such as myristic acid, palmitic acid, stearic acid, and behenic acid. Examples of branched saturated fatty acids include isostearic acid. Examples of linear unsaturated fatty acids include linear unsaturated fatty acids having 14 or more carbon atoms, such as linoleic acid, oleic acid, and linolenic acid. In order to improve the usability of the composition of the present invention, it is preferable to use a fatty acid that is liquid at 25°C.

[0017] As component (A), animal and vegetable oils containing one or more selected from ester oils, hydrocarbon oils, and fatty acids can also be used. Specific examples of animal and vegetable oils containing one or more selected from ester oils, hydrocarbon oils, and fatty acids include olive oil, jojoba oil, macadamia nut oil, medfoam oil, castor oil, safflower oil, sunflower oil, avocado oil, canola oil, apricot kernel oil, rice germ oil, rice bran oil, and lanolin oil, and one or more selected from these can be used.

[0018] From the viewpoint of the feel upon use and the like, it is preferable to use one or more oils selected from ester oils, hydrocarbon oils, and silicone oils as component (A), and it is more preferable to contain one or more oils selected from ester oils that are liquid at 25° C., hydrocarbon oils that are liquid at 25° C., and silicone oils that are liquid at 25° C. Specific examples include ester oils containing glycerin fatty acid esters such as triglycerides, hydrocarbon oils such as squalane, and silicone oils such as dimethicone and diphenylsiloxyphenyl trimethicone, and it is more preferable to use component (A) containing one or more oils selected from these.

[0019] The content of component (A) in the composition of the present invention is preferably 3% by mass or more, more preferably 4% by mass or more, and even more preferably 5% by mass or more, from the viewpoints of dispersibility of component (A) and durability of the formed film. Furthermore, from the viewpoints of dispersibility of component (A) and durability of the formed film, it is preferably 20% by mass or less, more preferably 18% by mass or less, and even more preferably 15% by mass or less. Taking the above into consideration, the content of component (A) in the composition of the present invention is preferably 3% by mass or more and 20% by mass or less, more preferably 4% by mass or more and 18% by mass or less, and even more preferably 5% by mass or more and 15% by mass or less.

[0020] The film-forming composition of the present invention contains a surfactant (hereinafter also referred to as "component (B)") having a melting point of 35°C or lower. Component (B) is blended into the film-forming composition for the purpose of forming an emulsion. This improves application properties and forms a uniform fiber network, thereby increasing the durability of the fiber network in the film and enhancing the transparency of the film.

[0021] Examples of component (B) include nonionic surfactants, anionic surfactants, etc. Examples of nonionic surfactants include polyoxyalkylene alkyl ethers, polyoxyalkylene alkyl allyl ethers, polyoxyalkylene derivatives, sorbitan fatty acid esters, polyoxyalkylene sorbitan fatty acid esters, polyoxyalkylene sorbitol fatty acid esters, glycerin fatty acid esters, polyoxyalkylene fatty acid esters, polyoxyalkylene alkylamines, alkyl alkanolamides, and polyoxyalkylene hydrogenated castor oil.

[0022] Specific examples of nonionic surfactants include poly(oxyethylene-oxypropylene)methylpolysiloxane copolymer, sorbitan monooleate, crosslinked polyether-modified silicone, crosslinked alkyl polyether-modified silicone, cetyl dimethicone copolyol, propylene glycol monostearate, polyoxyethylene hydrogenated castor oil 60, polyoxyethylene alkyl ether, sorbitan sesquioleate, polyoxyethylene sorbitan monostearate, diglyceryl monooleate, polyoxyethylene sorbitan fatty acid ester, polyoxyethylene sorbitan tetraoleate, propylene glycol fatty acid ester, polyoxyethylene alkenyl ether, polyoxyethylene polyoxypropylene glycol, polyoxyethylene polyoxypropylene alkyl ether, polyoxyethylene polyoxypropylene alkenyl ether, polyethylene glycol fatty acid ester, polyglycerin fatty acid ester, etc. These nonionic surfactants may be used alone or in combination of two or more.

[0023] Examples of the anionic surfactant include fatty acid salts, alkyl sulfate salts, alkyl sulfosuccinate salts, polyoxyalkylene alkyl sulfate salts, and polyoxyalkylene alkylaryl sulfate salts.

[0024] Specific examples of anionic surfactants include alkyl ether sulfates having 12 to 22 carbon atoms, such as polyoxyethylene lauryl triethanolamine sulfate, or salts thereof; polyoxyethylene alkyl ether phosphates having 12 to 22 carbon atoms, such as sodium polyoxyethylene cetyl ether phosphate, sodium polyoxyethylene oleyl ether phosphate, and sodium polyoxyethylene stearyl ether phosphate, or salts thereof; and dialkyl sulfosuccinates having 12 to 24 carbon atoms, such as sodium di-2-ethylhexyl sulfosuccinate, or salts thereof. These anionic surfactants may be used alone or in combination of two or more.

[0025] From the viewpoint of increasing the durability of the fiber network in the coating and increasing the transparency of the coating, it is preferable to use a nonionic surfactant as component (B), more preferably at least one selected from polyoxyethylene sorbitan monostearate, polyoxyethylene hydrogenated castor oil, and sucrose fatty acid ester, and even more preferably at least one selected from polyoxyethylene sorbitan monostearate and polyoxyethylene hydrogenated castor oil. It is also preferable that component (B) consists of a nonionic surfactant.

[0026] From the viewpoints of improving the durability of the coating, providing a good appearance, and suppressing stickiness, the content of component (B) in the film-forming composition of the present invention is preferably 0.1% by mass or more, more preferably 0.3% by mass or more, even more preferably 0.5% by mass or more, and even more preferably 1% by mass or more. Furthermore, from the viewpoint of good spreadability upon application, the content of component (B) in the film-forming composition of the present invention is preferably 6% by mass or less, more preferably 5.5% by mass or less, and even more preferably 5% by mass or less. The present inventors consider "good appearance" in this context to mean, when the film-forming composition is applied to the skin, that although the composition contains oily components, shine due to the oily components or skin sebum is difficult to see, or that shine is not visible at all. The present inventors consider "stickiness" in this context to mean a state in which viscosity is felt, or stickiness upon contact with oil.

[0027] The film-forming composition of the present invention contains, as a constituent, a polyhydric alcohol (hereinafter also referred to as "component (C)") that is either liquid at 25°C or a sugar alcohol. Component (C) may have the effect of plasticizing regenerated cellulose fibers, which are component (E) described below. By adjusting the type and amount of component (C) 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 be dissolved 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.

[0028] 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 glycol and polypropylene glycol 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 component (C) can be used alone or in combination of two or more.

[0029] The content of component (C) 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, from the viewpoints of improving the durability of the formed film, improving the appearance of the film, and improving the feel when used, such as preventing the film from feeling hard or causing discomfort such as a tight feeling. Furthermore, from the viewpoint of preventing an excessive decrease in the durability of the film, the content of component (C) in the film-forming composition of the present invention is preferably 20% by mass or less, more preferably 15% by mass or less, and even more preferably 10% by mass or less.

[0030] The film-forming composition of the present invention may further contain, as component (C'), 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 (C') 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, and even more preferably 0.1% by mass or more. The content is preferably 3% by mass or less, more preferably 2% by mass or less, even more preferably 1% by mass or less, even more preferably 0.7% by mass or less, and even more preferably 0.5% by mass or less.

[0031] The film-forming composition of the present invention contains water (hereinafter also referred to as "component (D)") as a constituent component. From the viewpoint of good spreadability during application, the content of component (D) in the film-forming composition of the present invention is preferably 50% by mass or more, more preferably 60% by mass or more, and even more preferably 65% ​​by mass or more. Furthermore, the content of component (D) in the film-forming composition of the present invention is preferably 95% by mass or less, more preferably 90% by mass or less, and even more preferably 85% by mass or less.

[0032] The film-forming composition of the present invention contains regenerated cellulose fibers (hereinafter also referred to as "component (E)") 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 good dispersibility in the aqueous 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). Furthermore, they can be washed off after application to the skin. Among regenerated cellulose fibers, unmodified cellulose fibers are preferred from the viewpoint of improving the degradability of the film-forming composition of the present invention into the aqueous phase. 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.

[0033] One of the characteristics of regenerated cellulose fibers is that their average fiber diameter is relatively small. Specifically, from the viewpoints of good dispersibility in the composition, ease of fiber network formation, and adhesion of the formed film, 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. Furthermore, from the viewpoints of film durability, good adhesion of the film, and appropriate size of voids formed between fibers in the film, 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. 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.

[0034] 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.

[0035] 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.

[0036] 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 even more preferably 100 μm or less.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] The CV value is calculated by [standard deviation of fiber length] / [average fiber length]×100[%].

[0042] 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 even more pronounced, the regenerated cellulose fibers 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, it is even more preferable that the regenerated cellulose fibers contain 15% 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.

[0043] 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.

[0044] 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 adhesion of the formed film, 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 resistance to aggregation, the aspect ratio of regenerated cellulose fibers is preferably 200 or less, more preferably 180 or less, and even more preferably 150 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.

[0045] 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, liquid agents, oils, cosmetics, topical skin preparations, etc.

[0046] From the viewpoints of the durability of the formed film and ease of network formation, the content of component (E) 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 (E) in the film-forming composition of the present invention is preferably 10% by mass or less, more preferably 9% by mass or less, and even more preferably 8% by mass or less.

[0047] In the film-forming composition of the present invention, the mass ratio (C) / (E) of component (C) to component (E) is preferably 0.1 or more, from the viewpoint of sufficiently plasticizing component (E) so that the film does not feel hard and does not cause discomfort such as a tight feeling, and from the viewpoint of the durability and good appearance of the film. To further enhance this advantage, the ratio (C) / (E) is preferably 0.3 or more, even more preferably 0.5 or more, and even more preferably 1 or more. Furthermore, to prevent excessive deterioration of the durability of the film, the ratio (C) / (E) is preferably 25 or less, more preferably 12 or less, even more preferably 10 or less, even more preferably 9 or less, and even more preferably 8 or less.

[0048] In the film-forming composition of the present invention, the mass ratio (A) / (E) of component (A) to component (E) is preferably 0.3 or more, more preferably 0.5 or more, even more preferably 0.7 or more, and even more preferably 1 or more, from the viewpoints of suppressing stickiness and further improving the durability and appearance of the coating. Furthermore, from the viewpoints of suppressing stickiness while ensuring the durability and good appearance of the coating, the mass ratio (A) / (E) is preferably 100 or less, more preferably 30 or less, even more preferably 20 or less, and even more preferably 15 or less.

[0049] In the film-forming composition of the present invention, the mass ratio (B) / (E) of component (B) to component (E) is preferably 0.05 or more, more preferably 0.1 or more, and even more preferably 0.4 or more, from the viewpoints of suppressing stickiness and further improving the durability and appearance of the coating. Furthermore, from the viewpoints of suppressing stickiness while ensuring the durability and good appearance of the coating, the mass ratio (B) / (E) is preferably 30 or less, more preferably 12 or less, even more preferably 7 or less, and even more preferably 5 or less.

[0050] 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 average fiber diameter２ / 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, even more preferably 0.23 or more, and even more preferably 0.25 or more. Furthermore, from the viewpoint of ease of production, this value is preferably 7 or less, even more preferably 5 or less, and even more preferably 4 or less.

[0051] The film-forming composition of the present invention may contain, as the fiber material, in addition to regenerated cellulose fiber, modified cellulose fiber, and fiber other than cellulose fiber, such as thermoplastic fiber, etc. However, from the viewpoint of making the advantage of using regenerated cellulose fiber more prominent, it is preferable that the film-forming composition of the present invention contains only regenerated cellulose fiber as the fiber material.

[0052] The film-forming composition of the present invention may contain other components in addition to the components described above. Such other components may include, for example, a surfactant (excluding components (A) and (B); hereinafter, also referred to as "component (F)"). The surfactant component (F) has a melting point above 35°C, and specific examples thereof include N-acylamino acids or salts thereof, N-acyltaurines or salts thereof; fatty acids having 12 to 22 carbon atoms or salts thereof, such as sodium laurate, potassium palmitate, and arginine stearate; alkyl sulfates having 12 to 22 carbon atoms or salts thereof, such as sodium lauryl sulfate and potassium lauryl sulfate; N-acyl sarcosines having 12 to 22 carbon atoms or salts thereof, such as sodium lauroyl sarcosinate; alkyl phosphoric acids having 12 to 22 carbon atoms or salts thereof, such as sodium monostearyl phosphate; and sucrose fatty acid esters. It is preferable to use one or more surfactants selected from these.

[0053] From the viewpoint of ensuring that the effects of the present invention are reliably achieved, the smaller the amount of component (F) contained in the film-forming composition of the present invention, the better. Specifically, the film-forming composition for skin of the present invention can contain component (F) so that the value W2 / W1, which is the ratio of the mass W2 of the surfactant of component (B) to the mass W1 of all surfactants contained in the composition, in other words, the value (B) / ((B)+(F)), is 80 mass% or more, or can contain component (F) so that the value is 90 mass% or more. The content of component (F) may be zero.

[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 UV absorbers, water-soluble polymers such as carboxyvinyl polymers, pH adjusters, disinfectants, anti-inflammatory agents, preservatives such as phenoxyethanol, colorants, chelating agents, whitening agents, antiperspirants, insect repellents, physiologically active ingredients, salts, antioxidants, fragrances, powder components, neutralizers such as potassium hydroxide, and thickeners. 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. The amount of optional components, when included, expressed as 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 0.1 μm to 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 reliably 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 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 the volume cumulative particle size D at a cumulative volume of 50% by 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] Examples of the ultraviolet absorber include benzoic acid-based ultraviolet absorbers, anthranilic acid-based ultraviolet absorbers, salicylic acid-based ultraviolet absorbers, cinnamic acid-based ultraviolet absorbers, benzoylmethane-based ultraviolet absorbers, triazine-based ultraviolet absorbers, benzophenone-based ultraviolet absorbers, and hydantoin-based ultraviolet absorbers, and are solid at 25°C. These ultraviolet absorbers may be used alone or in combination of two or more. Among these ultraviolet absorbers, from the viewpoint of ultraviolet protection effect, one or more selected from benzoic acid-based ultraviolet absorbers, cinnamic acid-based ultraviolet absorbers, and triazine-based ultraviolet absorbers are preferred.

[0057] Specific examples of ultraviolet absorbers include diethylaminohydroxybenzoylhexyl benzoate, 2,4,6-tris[4-(2-ethylhexyloxycarbonyl)anilino]-1,3,5-triazine (also known as "ethylhexyltriazone"), 2,4-bis-[{4-(2-ethylhexyloxy)-2-hydroxy}-phenyl]-6-(4-methoxyphenyl)-1,3,5-triazine, and drometrizole trisiloxane.

[0058] The film-forming composition of the present invention can be produced by conventional methods by heating and mixing the above-mentioned components as necessary. The film-forming composition of the present invention produced in this manner is preferably an oil-in-water emulsion. In this case, it is preferable that the regenerated cellulose fiber, component (E), is present mainly in the aqueous phase. However, this does not prevent the regenerated cellulose fiber, component (E), from being present in the oil phase.

[0059] The film-forming composition of the present invention can form a uniform film on human skin by application. Furthermore, in this film, a fibrous 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 aqueous phase. Furthermore, since the regenerated cellulose fibers are less likely to aggregate, the composition can be spread evenly upon application. As a result, a fibrous network is uniformly formed in the film, improving the durability and appearance of the film. Furthermore, stickiness is suppressed. Furthermore, when the film-forming composition of the present invention is applied to human skin, the resulting film is preferably transparent or translucent, and a transparent or translucent film containing a fibrous network that maintains a more natural skin appearance can be obtained. In other words, when the skin film-forming composition of the present invention is applied to skin, the regenerated cellulose fibers (component (E)) form a network on the skin, thereby forming a transparent or translucent film on the skin. Here, transparent or translucent means that the boundary between the area where the composition is applied and the skin is not clear and the color of the skin can be clearly seen.

[0060] 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 using an optical microscope, an electron microscope, or the like to measure the thickness of the coating formed on a substrate using the coating-forming composition of the present invention.

[0061] 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 (E): (A) a non-volatile oil in an amount of 3% by mass or more and 20% by mass or less; (B) a surfactant having a melting point of 35°C or less; (C) a polyhydric alcohol that is liquid at 25°C or is a sugar alcohol; (D) water; and (E) unmodified regenerated cellulose fibers having an average fiber diameter of 0.5 μm or more and an average fiber length of 20 μm or more and 300 μm or less. <2> The film-forming composition for skin according to <1>, wherein the regenerated cellulose fibers of (E) have a fiber length variation coefficient of 40% or more and 100% or less. <3> The film-forming composition for skin according to <1> or <2>, wherein the amount of the surfactant of component (B) relative to all surfactants contained in the film-forming composition for skin is preferably 80% by mass or more. <4> The film-forming composition for skin according to any one of <1> to <3>, wherein the aspect ratio of the component (E), defined by the average fiber length / average fiber diameter, is preferably 8 or more and 200 or less. <5> The (average fiber diameter) of the component (E) ２ / fiber content (μm ２ <6> The film-forming composition for skin according to any one of <1> to <4>, wherein the (mass%) is preferably from 0.05 to 8. <6> The film-forming composition for skin according to any one of <1> to <5>, wherein the component (A) preferably contains one or more oils selected from ester oils, hydrocarbon oils, and silicone oils, and more preferably contains one or more oils selected from ester oils that are liquid at 25°C, hydrocarbon oils that are liquid at 25°C, and silicone oils that are liquid at 25°C.

[0062] <7> The film-forming composition for skin according to any one of <1> to <6>, wherein the content of the component (A) is preferably 3% by mass or more and 20% by mass or less. <8> The film-forming composition for skin according to any one of <1> to <7>, wherein the component (B) preferably contains a nonionic surfactant, more preferably consists of a nonionic surfactant. <9> The film-forming composition for skin according to any one of <1> to <8>, wherein the content of the component (B) is preferably 0.1% by mass or more and 6% by mass or less. <10> The film-forming composition for skin according to any one of <1> to <9>, wherein the mass ratio (C) / (E) of the contents of the component (C) to the component (E) is preferably 0.1 to 12. <11> The film-forming composition for skin according to any one of <1> to <10>, wherein the mass ratio (C) / (E) of the contents of the component (C) to the component (E) is preferably 1 to 8. <12> The film-forming composition for skin according to any one of <1> to <11>, wherein the mass ratio (A) / (E) of the contents of the component (A) to the component (E) is preferably 0.3 or more and 100 or less, more preferably 0.5 or more and 30 or less, and even more preferably 0.7 or more and 20 or less. <13> The film-forming composition for skin according to any one of <1> to <12>, wherein the mass ratio (B) / (E) of the contents of the component (B) to the component (E) is preferably 0.05 or more and 30 or less, more preferably 0.1 or more and 12 or less, and even more preferably 0.4 or more and 7 or less. <14> The (average fiber diameter) of the component (E) ２ / fiber content (μm ２ <14> The film-forming composition for skin according to any one of <1> to <13>, wherein the (wt%) is preferably more than 0.2 and not more than 8, more preferably 0.23 or more and not more than 7.

[0063] <15> The film-forming composition for skin according to any one of <1> to <14>, wherein the blending amount of powder 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. <16> The film-forming composition for skin according to any one of <1> to <15>, wherein the average fiber diameter of component (E) is preferably 0.7 μm or more and 2 μm or less. <17> The film-forming composition for skin according to any one of <1> to <16>, wherein the average fiber length of component (E) is preferably 20 μm or more and 150 μm or less. <18> The film-forming composition for skin according to any one of <1> to <17>, wherein the content of component (E) is preferably 0.5% by mass or more, more preferably 0.7% by mass or more. <19> A method for forming a film on human skin, comprising applying the skin film composition according to any one of <1> to <18> to the skin, and causing the component (E) to form a network on the skin, thereby forming a transparent or translucent film on the skin.

[0064] 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."

[0065] Examples 1 to 6: Squalane (manufactured by Nippon Surfactant Co., Ltd., product name: Nikkol Sugar Squalane) and macadamia nut oil (manufactured by NOF Corporation, product name: Refined Macadamia Oil) were used as component (A). Polyoxyethylene sorbitan monostearate (manufactured by Kao Corporation, product name: Rheodol TW-S120V) and polyoxyethylene hydrogenated castor oil 60 (manufactured by Nippon Surfactant Co., Ltd., product name: Nikkol HCO-60) were used as component (B). Glycerin (manufactured by NOF Corporation, product name: RG.CO.K) and dipropylene glycol (manufactured by ADEKA Corporation, product name: DPG-RF) were used as component (C). Carboxyvinyl polymer (3V manufactured by Sigma S.p.A., product name: Syntaren K) was used as the water-soluble polymer. Potassium hydroxide (manufactured by Toagosei Co., Ltd., product name: liquid caustic potash (48%)) was used as the neutralizing agent. Phenoxyethanol (manufactured by Toho Chemical Industry Co., Ltd., product name: Hisorb EPH) was used as the preservative. The above components were blended in the proportions (mass %) shown in Table 1 to obtain oil-in-water compositions. The obtained compositions were evaluated as follows. The results are shown in Table 1.

[0066] 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% by mass, a copper concentration of 1.8% by mass, and an ammonia concentration of 5.5% by 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 180 outlet holes with a hole diameter of 0.3 mm and a hole spacing of 1.1 mm was used, and the cuprammonium cellulose solution was discharged into warm water at 20°C through the outlet. Drawing and deammoniating were performed using the down-flow tension spinning method to produce a blue yarn. The blue yarn and warm water were then poured into a semicircular inclined trough located 20 cm below the funnel outlet while 50°C warm water was flowing through the trough, and the blue yarn and warm water were separated by pouring the water into a plastic net. The blue yarn was then thoroughly decoppered by showering 10% by mass of sulfuric acid over the blue yarn. The mixture was then showered with pure water to thoroughly wash away the sulfuric acid, yielding continuous, wet 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 (MX-1200XT, manufactured by AS ONE Corporation) and processed for 5 minutes. The cellulose fibers were then 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 fibrillation-treated cellulose fibers. The resulting fibrillation-treated 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 subjected to a micronization treatment five times at an operating pressure of 100 MPa using a high-pressure homogenizer (NS015H, manufactured by Nia Sorobi Co., Ltd.) to prepare shortened regenerated cellulose fibers.

[0067] Example 7 An oil-in-water composition was obtained in the same manner as in Example 1, except that dimethicone (manufactured by Shin-Etsu Chemical Co., Ltd., product name: Silicone KF-96A-2CS) and diphenylsiloxyphenyl trimethicone (manufactured by Dow Corning Toray Co., Ltd., product name: DOWSIL FZ-209) were used as component (A) and the components shown in Table 1 were blended in the proportions (% by mass) shown in the same table. The obtained composition was evaluated as follows. The results are shown in Table 1.

[0068] Comparative Example 1 An oil-in-water composition was obtained in the same manner as in Example 1, except that acrylic resin fibers were used instead of regenerated cellulose fibers and the components shown in Table 2 were blended in the proportions (mass %) shown in the same table. The obtained composition was evaluated as follows. The results are shown in Table 2.

[0069] Comparative Example 2 An oil-in-water composition was obtained in the same manner as in Example 1, except that cellulose nanofibers (CNF) were used instead of regenerated cellulose fibers and the components shown in Table 2 were blended in the proportions (mass %) shown in the same table. The obtained composition was evaluated as follows. The results are shown in Table 2.

[0070] Comparative Example 3 An oil-in-water composition was obtained in the same manner as in Example 1, except that the components shown in Table 2 were blended in the proportions (mass %) shown in the same table. In this comparative example, component (E) was not blended. The resulting composition was evaluated as follows. The results are shown in Table 2.

[0071] Comparative Example 4 An oil-in-water composition was obtained in the same manner as in Example 1, except that the components shown in Table 2 were blended 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 2.

[0072] Comparative Example 5 An oil-in-water composition was obtained in the same manner as in Example 1, except that the components shown in Table 2 were blended in the proportions (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 2.

[0073] Comparative Example 6 An oil-in-water composition was obtained in the same manner as in Example 1, except that the components shown in Table 2 were blended in the proportions (% by mass) shown in the same table. In this comparative example, component (F) was blended in place of component (B). Glyceryl stearate (manufactured by Miyoshi Oil & Fats Co., Ltd., product name: Montex A) was used as component (F). The obtained composition was evaluated as follows. The results are shown in Table 2.

[0074] [Film Durability] Ten expert panelists used the film-forming composition for skin, and judged the durability of the coating after 6 hours (whether it felt like it remained on the skin) based on the following criteria, and the total score was used to judge. 5: Durable 4: Somewhat durable 3: Neither durable nor durable 2: Somewhat undurable 1: Undurable <Judgment> ◎: Total score is 40 points or more ○: Total score is 30 points or more but less than 40 points △: Total score is 20 points or more but less than 30 points ×: Total score is less than 20 points

[0075] [Appearance of the film] Model sebum was applied to the artificial leather at a rate of 20 μg / cm ２ On top of that, a film-forming composition for skin was applied at a concentration of 2 mg / cm ２ The coating was reapplied. Five expert panelists evaluated the appearance of the coating using the following criteria, and the total score was used to judge the appearance of the coating. 5: Shine is suppressed 4: Shine is slightly suppressed 3: Neither 2: Shine is not suppressed very much 1: Shine is not suppressed at all <Judgment> ◎: Total score is 20 points or more ○: Total score is 15 points or more but less than 20 points △: Total score is 10 points or more but less than 15 points ×: Total score is less than 10 points

[0076] [Suppression of stickiness] The composition was applied to the forearms of five expert panelists at a concentration of 2 mg / cm. ２The coating was applied, and the degree of stickiness suppression of the coating upon application was evaluated based on the following criteria, and the degree of stickiness suppression was determined by the total score: 5: Stickiness suppressed 4: Stickiness suppressed slightly 3: Neither 2: Stickiness not suppressed much 1: Stickiness not suppressed at all <Judgment> ◎: Total score is 20 points or more ○: Total score is 15 points or more but less than 20 points △: Total score is 10 points or more but less than 15 points ×: Total score is less than 10 points

[0077]

[0078]

[0079] As is clear from the results shown in Tables 1 and 2, the films formed from the compositions obtained in each Example were found to be highly durable. It was also found that the films formed from the compositions obtained in each Example exhibited good appearance. Furthermore, it was found that the films formed from the compositions obtained in each Example were less sticky.

[0080] According to the film-forming composition for skin of the present invention, fiber aggregation is suppressed, thereby forming a uniform fiber network in the film, resulting in good durability and appearance of the film and suppressing stickiness.

Claims

1. A film-forming composition for skin containing the following components (A) to (E): (A) 3% by mass or more and 20% by mass or less of a non-volatile oil. (B) A surfactant having a melting point of 35°C or less. (C) A polyhydric alcohol that is liquid at 25°C or is a sugar alcohol. (D) Water. (E) 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, wherein the coefficient of variation of the fiber length of the regenerated cellulose fibers in (E) is 40% or more and 100% or less.

3. A film-forming composition for skin according to claim 1 or 2, wherein the amount of the surfactant of component (B) relative to all surfactants contained in the film-forming composition for skin is 80% by mass or more.

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

5. (Average fiber diameter) of the component (E) 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.

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