Film-forming composition for skin

Abstract

The film-forming composition for skin contains the following components (A) to (F). An acrylamide-based polymer (A) Hydrophobic metal oxide fine particles (B) 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 A nonvolatile oil (F) Component (F) preferably includes an oil agent that is liquid at 25°C. The variation coefficient value of the fiber lengths of the regenerated cellulose fibers of component (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 (F): (A) an acrylamide polymer; (B) hydrophobic metal oxide fine particles; (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 to 5 μm and an average fiber length of 20 μm to 300 μm; and (F) a non-volatile oil. Detailed Description of the Invention

[0006] The fibers used in the above-mentioned Patent Documents 1 and 2 are both composed of hydrophobic materials, making it difficult to achieve good dispersion in an aqueous phase. On the other hand, even hydrophilic materials are not necessarily easily dispersed in an aqueous phase. If the dispersion of fibers in the composition is insufficient, for example, when the emulsions or compositions described in these documents are applied to a surface to form a coating film, the fibers are likely to 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, and problems may arise during application. Therefore, the present invention relates to a film-forming composition for skin that can form a film in which fibers are uniformly dispersed.

[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 an acrylamide polymer (hereinafter also referred to as "component (A)") as a constituent component. Component (A) is blended for the purpose of thickening the aqueous phase, which is the continuous phase, and stably distributing the hydrophobic metal oxide fine particles described below in the oil phase, thereby improving emulsion stability. Examples of polyacrylamide polymers include polyacrylamide and acrylamide copolymers. Examples of acrylamide copolymers include copolymers containing acrylamide and / or acryloyldimethyltaurine as constituent units.

[0009] Examples of copolymers containing acrylamide and / or acryloyldimethyltaurine as constituent units include a copolymer of hydroxyethyl acrylate and acryloyldimethyltaurine salt, a copolymer of an acrylate and acryloyldimethyltaurine salt, a copolymer of acrylamide and an acrylate salt, and a copolymer of acrylic acid, acrylic acid amide, an acrylate salt and acryloyldimethyltaurine salt.

[0010] Commercially available acrylamide polymers can also be used, such as polyacrylamide SEPIGEL 305 (polyacrylamide, hydrogenated polyisobutene (or (C13,14) isoparaffin), laureth-7, and water). Copolymers of hydroxyethyl acrylate and acryloyldimethyltaurate salts include SEPINOV EMT 10 ((hydroxyethyl acrylate / sodium acryloyldimethyltaurate) copolymer), SIMULGEL NS ((hydroxyethyl acrylate / sodium acryloyldimethyltaurate) copolymer, squalane, polysorbate 60, water), SIMULGEL FL ((hydroxyethyl acrylate / sodium acryloyldimethyltaurate) copolymer, isohexadecane, polysorbate 60, water), and SEPIPLUS S ((hydroxyethyl acrylate / sodium acryloyldimethyltaurate) copolymer, polyisobutene, PEG-7 trimethylolpropane coconut oil alkyl ether, water). An example of a copolymer of an acrylate and an acryloyldimethyltaurate is SIMULGEL EG ((sodium acrylate / sodium acryloyldimethyltaurate) copolymer, isohexadecane, polysorbate 80, water). An example of a copolymer of an acrylamide and an acrylate is SEPIPLUS 265 ((acrylamide / ammonium acrylate) copolymer, polyisobutene, polysorbate 20, water). An example of a copolymer of acrylic acid, acrylic acid amide, an acrylate, and an acryloyldimethyltaurate is SEPIPLUS 400 (polyacrylate-13, polyisobutene, polysorbate 20, water).

[0011] Among these acrylamide polymers, a copolymer of an acrylate and an acryloyldimethyltaurate is preferred, and a (sodium acrylate / sodium acryloyldimethyltaurate) copolymer is more preferred.

[0012] The content of component (A) 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, and even more preferably 0.3% by mass or more, from the viewpoints of improving the spreadability and sustainability of the film-forming composition and improving cosmetic wear when used in combination with cosmetics such as makeup cosmetics. Furthermore, the content of component (A) is preferably 2.3% by mass or less, more preferably 2% by mass or less, and even more preferably 1.8% by mass or less, from the viewpoints of ensuring the effects of the film-forming composition, such as good spreadability, sustainability, and usability. The inventors consider that the good spreadability of the film-forming composition in the present invention means a state in which the composition can be applied evenly when spread and applied to the skin, and also includes associated effects.

[0013] The film-forming composition of the present invention contains hydrophobic metal oxide fine particles (hereinafter also referred to as "component (B)") as a constituent component. Component (B) includes those used as UV scattering agents and can be incorporated for the purpose of improving UV protection. From the viewpoint of absorbing or scattering UV rays and improving UV protection, component (B) is preferably one or more selected from the group consisting of fine zinc oxide, fine titanium oxide, and fine cerium oxide, and more preferably one or more selected from the group consisting of fine zinc oxide and fine titanium oxide. These metal oxide fine particles can contain a divalent or higher metal. For example, metals such as iron, zirconium, calcium, manganese, magnesium, and yttrium or their oxides can be contained alone or in appropriate combinations of two or more.

[0014] The metal oxide microparticles of component (B) have been subjected to a hydrophobic treatment, thereby imparting hydrophobicity to the metal oxide microparticles. Examples of hydrophobic treatments include silicone treatment; alkylalkoxysilane treatment; fatty acid treatment; fluorine-containing compound treatment using perfluoroalkyl phosphate esters, perfluoroalcohols, etc.; amino acid treatment using N-acylglutamic acid, etc.; lecithin treatment; metal soap treatment; alkyl phosphate ester treatment; and ASI treatment using an N-acylamino acid metal salt (sodium lauroyl aspartate), zinc chloride, and an alkoxytitanium alkylate (isopropyl titanium triisostearate). These hydrophobic treatments may be used alone or in combination of two or more. Among these, from the viewpoints of increasing the dispersibility of component (B) in the film-forming composition for skin of the present invention, improving UV protection effect and emulsion stability, and improving film formability, it is preferable to use one or more hydrophobic treatments selected from the group consisting of silicone treatment, alkylalkoxysilane treatment, and fatty acid treatment.

[0015] Examples of surface treatment agents used in silicone treatment include various silicone oils such as methylpolysiloxane, dimethylpolysiloxane (dimethicone), methylphenylpolysiloxane, methylhydrogenpolysiloxane, dimethylsiloxane / methylhydrogensiloxane copolymer (hydrogendimethicone), methylcyclopolysiloxane, dodecamethylcyclohexasiloxane, tetradecamethylhexasiloxane, dimethylsiloxane / methyl(polyoxyethylene)siloxane / methyl(polyoxypropylene)siloxane copolymer, dimethylsiloxane / methyl(polyoxyethylene)siloxane copolymer, dimethylsiloxane / methyl(polyoxypropylene)siloxane copolymer, dimethylsiloxane / methylcetyloxysiloxane copolymer, dimethylsiloxane / methylstearoxysiloxane copolymer, and (alkyl acrylate / dimethicone) copolymer. Of these, from the viewpoints of increasing the dispersibility of component (B) in the film-forming composition for skin of the present invention, improving the UV protection effect and emulsion stability, and improving film formability, dimethylpolysiloxane (dimethicone), methylhydrogenpolysiloxane, and dimethylsiloxane / methylhydrogensiloxane copolymer (hydrogendimethicone) are preferred, with methylhydrogenpolysiloxane and dimethylsiloxane / methylhydrogensiloxane copolymer (hydrogendimethicone) being more preferred.

[0016] The surface treatment agent used in the alkylalkoxysilane treatment is preferably an alkylalkoxysilane having a linear or branched alkyl group having from 6 to 20 carbon atoms, more preferably octyltriethoxysilane (triethoxycaprylylsilane) or octyltrimethoxysilane (trimethoxycaprylylsilane), and even more preferably octyltriethoxysilane (triethoxycaprylylsilane), from the viewpoints of increasing the dispersibility of component (B) in the film-forming composition for skin of the present invention, improving the UV protection effect and emulsion stability, and improving film formability.

[0017] Examples of surface treatment agents used in the fatty acid treatment include linear or branched higher fatty acids having from 12 to 22 carbon atoms. Of these, from the viewpoints of increasing the dispersibility of component (B) in the film-forming composition for skin of the present invention, improving the UV protection effect and emulsion stability, and improving film formability, linear or branched higher fatty acids having from 14 to 22 carbon atoms are preferred, linear or branched higher fatty acids having from 16 to 20 carbon atoms are more preferred, and stearic acid and isostearic acid are even more preferred.

[0018] As described above, from the viewpoints of increasing the dispersibility of component (B) in the film-forming composition for skin of the present invention, improving the UV protection effect and emulsion stability, and improving film formability, the hydrophobic treatment of component (B) is more preferably one or more treatments selected from the group consisting of silicone treatments using one or more surface treatment agents selected from the group consisting of methylhydrogenpolysiloxanes and dimethylsiloxane / methylhydrogensiloxane copolymers, alkylalkoxysilane treatments, and fatty acid treatments, and even more preferably one or more treatments selected from the group consisting of silicone treatments using one or more surface treatment agents selected from the group consisting of methylhydrogenpolysiloxanes and dimethylsiloxane / methylhydrogensiloxane copolymers, alkylalkoxysilane treatments using alkylalkoxysilanes having a linear or branched alkyl group having from 6 to 20 carbon atoms as a surface treatment agent, and fatty acid treatments using linear or branched higher fatty acids having from 14 to 22 carbon atoms as a surface treatment agent.

[0019] The above-mentioned surface treatment agents may be used alone or in combination of two or more. When titanium oxide is used as the metal oxide of component (B), in order to reduce photocatalytic activity, a treatment agent such as silica, hydrous silica, or a hydrous oxide of a metal such as aluminum may be used in combination with the above-mentioned surface treatment agent used for hydrophobic treatment.

[0020] The amount of hydrophobic treatment in component (B) is preferably 0.1% by mass or more in component (B) from the viewpoints of increasing the dispersibility of component (B) in the film-forming composition for skin of the present invention, improving film formability, and improving film durability and cosmetic wear, and is preferably 40% by mass or less, more preferably 30% by mass or less, from the viewpoints of ensuring effects such as film durability, cosmetic wear, and usability. In the present invention, the mass of component (B) and the average primary particle size described below mean the mass and average primary particle size including the surface treatment agent.

[0021] The shape of component (B) may be, for example, spherical, flaky, plate-like, rod-like, spindle-like, needle-like, or irregular, but any shape can be used. From the viewpoint of improving UV protection effect and emulsion stability, the average primary particle size of component (B) is preferably 100 nm or less, more preferably 80 nm or less, even more preferably 50 nm or less, and even more preferably 40 nm or less. From the viewpoint of versatility, the average primary particle size of component (B) is preferably 1 nm or more, more preferably 5 nm or more, and even more preferably 10 nm or more. Specifically, from the same viewpoints as above, the average primary particle size of component (B) is preferably 1 nm to 100 nm, more preferably 1 to 80 nm, even more preferably 5 to 50 nm, even more preferably 10 to 50 nm, and even more preferably 10 to 40 nm.

[0022] The average primary particle size of component (B) can be determined from an image observed with a transmission electron microscope (TEM). Specifically, the TEM is used to observe the particles at a magnification of 50,000x, and the maximum minor axis of 300 primary particles in the observed image is measured and the number average value is calculated. When component (B) has a shape other than a flaky or plate-like shape, the maximum minor axis refers to the minor axis having the longest length among the minor axes perpendicular to the major axis. When component (B) has a flaky or plate-like shape, the average primary particle size can be determined by measuring the thickness of 300 primary particles in the observed image observed under the same conditions as above and calculating the number average value.

[0023] Component (B) can be prepared by a known method using the above-mentioned surface treatment agent on metal oxide fine particles (hereinafter also referred to as "component (B')") before hydrophobization treatment. For example, as described in Japanese Patent No. 3187440, the surface treatment using silicone oil involves coating metal oxide fine particles such as zinc oxide fine particles in a non-gas phase with at least one silicone compound (excluding silane compounds) composed of organopolysiloxanes and silicone resins, and then baking the particles at a temperature of 600 to 950°C in an oxygen-containing atmosphere to coat the surfaces of the metal oxide fine particles with silicon oxide. Furthermore, as described in JP2007-326902A, the surface treatment using alkylalkoxysilane can be prepared by coating metal oxide fine particles with a specific polysiloxane compound, followed by surface treatment with the alkylalkoxysilane in water. This document is incorporated herein by reference. The preferred embodiment and measuring method of the average primary particle size of component (B') (fine particle metal oxide before hydrophobization treatment) used in the above-mentioned hydrophobization treatment are the same as the preferred embodiment and measuring method of component (B).

[0024] Commercially available hydrophobized zinc oxide microparticles include the FINEX series (manufactured by Sakai Chemical Industry Co., Ltd.), the MZ series, and the MZY series (all manufactured by Teika Corporation). Commercially available hydrophobized titanium oxide microparticles include the STR series (manufactured by Sakai Chemical Industry Co., Ltd.), the TTO-55 series, and the TTO-51 series (all manufactured by Ishihara Sangyo Kaisha, Ltd.), the MT series, and the MTY series (all manufactured by Teika Corporation).

[0025] The content of component (B) in the film-forming composition of the present invention is preferably 1% by weight or more, more preferably 3% by weight or more, even more preferably 5% by weight or more, and even more preferably 7% by weight or more, from the viewpoint of improving UV protection effect. Furthermore, from the viewpoint of improving emulsion stability, the content of component (B) is preferably 30% by weight or less, more preferably 25% by weight or less, even more preferably 20% by weight or less, and even more preferably 15% by weight or less.

[0026] 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) has the effect of plasticizing regenerated cellulose fibers, which are component (E) described below. Therefore, 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 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.

[0027] 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 having a weight-average molecular weight of 1000 g / mol or less, and polypropylene glycol; and glycerins such as glycerin, diglycerin, and triglycerin. Examples of sugar alcohols include maltitol, sorbitol, xylitol, and erythritol. Of these, 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 are preferred.

[0028] 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 spreadability of the composition, improving the sustainability of the cosmetic used in combination, and preventing the formed film from feeling hard and 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.

[0029] 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.

[0030] 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 upon application, the content of component (D) in the film-forming composition of the present invention is preferably 40% by mass or more, more preferably 42% by mass or more, and even more preferably 44% by mass or more. From the viewpoint of compatibility with the skin, the content of component (D) in the film-forming composition of the present invention is preferably 80% by mass or less, more preferably 78% by mass or less, and even more preferably 75% by mass or less.

[0031] 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 refer to natural cellulose fibers that have been dissolved by chemical treatment and then reconstituted into cellulose. Regenerated cellulose fibers have the advantage of being well dispersible in the aqueous phase of the film-forming composition of the present invention. They also 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, regenerated cellulose fibers have excellent salt resistance. Excellent salt resistance is advantageous because the regenerated cellulose fibers are less susceptible to the effects of metal ions eluted from the hydrophobic metal oxide particulates contained in the film-forming composition of the present invention. After application to the skin, the regenerated cellulose fibers can be easily removed by rinsing. Among the regenerated cellulose fibers, unmodified cellulose fibers are preferred from the viewpoint of further improving the decomposability 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 any other substituent. Unmodified cellulose fibers have a high hydroxyl group density and are extremely hydrophilic. Furthermore, unmodified cellulose fibers have the advantage of being even more excellent in salt resistance. As mentioned above, excellent salt resistance is advantageous because 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.

[0032] From the viewpoint of the adhesiveness of the film formed, 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 viewpoint of the durability of the film and good adhesive feel, 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.

[0033] Regenerated cellulose fibers can be 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 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.

[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] 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 250 μm or less, more preferably 200 μm or less, even more preferably 150 μm or less, and even more preferably 100 μm or less.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] The CV value is calculated by [standard deviation of fiber length] / [average fiber length]×100[%].

[0041] 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.

[0042] 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.

[0043] 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, resistance to aggregation, etc., the aspect ratio of the regenerated cellulose fibers is preferably 200 or less, more preferably 180 or less, even more preferably 150 or less, and even more 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.

[0044] 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.

[0045] 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, 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.

[0046] In the film-forming composition of the present invention, it is preferable that the mass ratio (C) / (E) of component (C) to component (E) is 0.1 or more, from the viewpoints of preventing the film from feeling stiff and suppressing discomfort such as a tight feeling, improving the spreadability of the composition, and improving the durability and long-lasting makeup of the film. To further enhance this advantage, the ratio (C) / (E) is more preferably 0.3 or more, even more preferably 0.5 or more, and even more preferably 1.0 or more. Furthermore, from the viewpoint of film durability, the ratio (C) / (E) is preferably 10 or less, even more preferably 9 or less, and even more preferably 8 or less.

[0047] In the film-forming composition of the present invention, the mass ratio (A) / (E) of component (A) to component (E) is preferably 0.05 or more, even more preferably 0.1 or more, and even more preferably 0.2 or more, from the viewpoint of further improving the spreadability of the film-forming composition, film durability, cosmetic wear, etc. Similarly to the above, from the viewpoint of improving the spreadability of the film-forming composition while ensuring the durability of the film and cosmetic wear, the mass ratio (A) / (E) is preferably 10 or less, more preferably 4 or less, and even more preferably 1.8 or less. From the viewpoints of improving the spreadability of the film-forming composition, of ensuring good film durability, and of ensuring effects such as cosmetic wear, the contents of component (A) and component (E) and the mass ratio (A) / (E) are preferably such that the content of component (A) is from 0.3 to 2% by mass, the content of component (E) is from 0.5 to 8% by mass, and the mass ratio (A) / (E) is from 0.05 to 4; and more preferably the content of component (A) is from 0.3 to 1.8% by mass, the content of component (E) is from 0.7 to 8% by mass, and the mass ratio (A) / (E) is from 0.1 to 2.5.

[0048] 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 (E) 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 the larger this value, the shorter the 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.

[0049] The film-forming composition of the present invention may contain, as the fiber material, cellulose ((C ６ H １０ O ５ ) ｎ The film-forming composition of the present invention may include modified cellulose fibers in which the hydroxyl groups in the cellulose ester group are substituted with other functional groups, and fibers other than cellulose fibers, such as thermoplastic fibers. However, from the viewpoint of making the most of the advantages of using regenerated cellulose fibers, it is preferable that the film-forming composition of the present invention contains only regenerated cellulose fibers as the fiber material.

[0050] The film-forming composition of the present invention may contain other components in addition to the components described above. For example, the film-forming composition of the present invention may contain a non-volatile oil (hereinafter also referred to as "component (F)"). Component (F) is added for the purpose of making it easier to form a network of regenerated cellulose fibers, component (E), in the film formed on the skin when the film-forming composition of the present invention is applied to the skin. As used herein, "non-volatile" means that the vapor pressure at 25°C is less than 200 Pa.

[0051] Component (F) may contain, for example, an oil that is liquid at 25°C, or may contain an oil that is solid at 25°C. From the viewpoint of facilitating the formation of a network of regenerated cellulose fibers in the coating, it is preferable that component (F) contains at least an oil that is liquid at 25°C. When component (F) contains an oil that is liquid at 25°C, in order to further enhance the above-mentioned effects, the content of the oil that is liquid at 25°C in component (F) is preferably 55% by mass or more, more preferably 58% by mass or more, and even more preferably 60% by mass or more. From the same viewpoint, the content of the oil that is liquid at 25°C in component (F) is preferably 95% by mass or less, more preferably 94% by mass or less, and even more preferably 93% by mass or less.

[0052] Examples of component (F) include ester oils, hydrocarbon oils, and silicone oils. These oils can be used alone or in combination of two or more.

[0053] 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 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, diethylhexyl naphthalenedicarboxylate, benzoic acid (carbon number 12-15) Alkyl, Cetearyl Isononanoate, Caprylic / Capric Triglycerin, Butylene Glycol Dicaprylic / Capric Triglyceride, 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-Lauroyl-L-Glutamate-2-Octyldodecyl One or more selected from the group consisting of ethylhexyl 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 p-methoxycinnamate, tripropylene glycol dipivalate, dicapryl carbonate, polyglyceryl diisostearate, and dipentaerythrityl tri-polyhydroxystearate can be used.

[0054] Examples of the hydrocarbon oil include hydrocarbon oils that are liquid at 20° C., such as liquid paraffin, squalane, squalene, hydrogenated polyisobutene, polyisobutene (pentamer or higher), and liquid isoparaffin.

[0055] Examples of silicone oils include 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, cyclic silicone, and alkyl-modified silicone, and it is preferable to use at least dimethylpolysiloxane (5 cs or more) as the silicone oil.

[0056] An organic UV absorber can also be used as component (F). Examples of organic UV absorbers include benzoic acid UV absorbers, anthranilic acid UV absorbers, salicylic acid UV absorbers, cinnamic acid UV absorbers, benzophenone UV absorbers, and triazine UV absorbers. Among these, from the viewpoints of UV protection effect, less stickiness after application, and stability over time, one or more selected from benzoic acid UV absorbers and triazine UV absorbers are preferred. Furthermore, oil-soluble organic UV absorbers are preferred as organic UV absorbers.

[0057] Examples of benzoic acid-based ultraviolet absorbers include para-aminobenzoic acid (PABA), glyceryl PABA, ethyl dihydroxypropyl PABA, N-ethoxylate PABA ethyl ester, N-dimethyl PABA ethyl ester, N-dimethyl PABA butyl ester, N-dimethyl PABA amyl ester, octyl dimethyl PABA, and diethylaminohydroxybenzoyl hexyl benzoate. Examples of anthranilic acid-based ultraviolet absorbers include homomenthyl-N-acetylanthranilate. Examples of salicylic acid-based ultraviolet absorbers include amyl salicylate, menthyl salicylate, homomenthyl salicylate, octyl salicylate, phenyl salicylate, benzyl salicylate, and p-isopropanol phenyl salicylate.

[0058] Examples of cinnamic acid-based ultraviolet absorbers include octyl cinnamate, ethyl 4-isopropyl cinnamate, ethyl 2,4-diisopropyl cinnamate, methyl 2,4-diisopropyl cinnamate, propyl p-methoxy cinnamate, isopropyl p-methoxy cinnamate, isoamyl p-methoxy cinnamate, 2-ethylhexyl p-methoxy cinnamate, 2-ethoxyethyl p-methoxy cinnamate, cyclohexyl p-methoxy cinnamate, ethyl α-cyano-β-phenyl cinnamate, 2-ethylhexyl α-cyano-β-phenyl cinnamate, and glyceryl mono-2-ethylhexanoyl di-para-methoxy cinnamate. Examples of the benzophenone-based ultraviolet absorber include 2,4-dihydroxybenzophenone, 2,2'-dihydroxy-4-methoxybenzophenone, 2,2'-dihydroxy-4,4'-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-methoxy-4'-methylbenzophenone, 2-hydroxy-4-methoxybenzophenone, 4-phenylbenzophenone, 2-ethylhexyl-4'-phenylbenzophenone-2-carboxylate, 2-hydroxy-4-n-octoxybenzophenone, and 4-hydroxy-3-carboxybenzophenone. Examples of triazine-based ultraviolet absorbers include 2,4,6-tris[4-(2-ethylhexyloxycarbonyl)anilino]-1,3,5-triazine (ethylhexyltriazone), dioctylbutamidotriazone, and 2,4-bis-[{4-(2-ethylhexyloxy)-2-hydroxy}-phenyl]-6-(4-methoxyphenyl)-1,3,5-triazine.Other organic UV absorbers include 3-(4'-methylbenzylidene)-dl-camphor, 3-benzylidene-dl-camphor, urocanic acid ethyl ester, 2-phenyl-5-methylbenzoxazole, 2,2'-hydroxy-5-methylphenylbenzotriazole, 2-(2'-hydroxy-5-t-octylphenyl)benzotriazole, dibenzalazine, dianisoylmethane, 4-methoxy-4'-t-butyldibenzoylmethane, 5-(3,3-dimethyl-2-norbornylidene)-3-pentan-2-one, drometrizole trisiloxane, benzene bis-1,3-diketone derivatives described in JPH2-212579A, and benzoyl pinacolone derivatives described in JPH3-220153A. These documents are incorporated herein by reference.

[0059] The film-forming composition of the present invention may contain, as component (F), an oil that is solid at 25° C. (hereinafter also referred to as a "solid fat") The inclusion of a solid fat strengthens the oil droplet interface and improves emulsion stability.

[0060] Examples of solid fats include higher alcohols having 14 to 22 carbon atoms, linear saturated fatty acids having 14 or more carbon atoms, cholesterol, ceramide, and phospholipids. These components can be used alone or in combination of two or more.

[0061] As the higher alcohol having 14 to 22 carbon atoms, it is preferable to use an aliphatic monohydric alcohol, it is preferable to use a straight-chain aliphatic alcohol and / or a saturated aliphatic alcohol, and it is more preferable to use a straight-chain saturated aliphatic alcohol.

[0062] Specific examples of higher alcohols having 14 to 22 carbon atoms include saturated aliphatic monohydric alcohols such as myristyl alcohol, cetyl alcohol, cetearyl alcohol, stearyl alcohol, isostearyl alcohol, arachidyl alcohol, behenyl alcohol, etc. These higher alcohols can be used alone or in combination of two or more.

[0063] From the viewpoint of storage stability in an emulsion state, it is preferable to use a combination of two or more aliphatic alcohols having different carbon numbers as the higher alcohol having 14 to 22 carbon atoms. In this case, the mass ratio (a1) / (a2) of the short-chain aliphatic alcohol (having 14 to less than 18 carbon atoms) (a1) to the long-chain aliphatic alcohol (having 18 to 20 carbon atoms) (a2) is preferably 0.1 or more, more preferably 0.6 or more, and even more preferably 1.0 or more. Furthermore, (a1) / (a2) is preferably 7.0 or less, more preferably 5.0 or less, even more preferably 3.0 or less, and even more preferably 2.5 or less.

[0064] Examples of phospholipids include glycerophospholipids such as lecithin, hydrogenated lecithin, hydroxylated lecithin, phosphatidylethanolamine, phosphatidylserine, phosphatidylcholine, phosphatidylinositol, phosphatidylglycerol, and cardiolipin; and sphingophospholipids such as sphingomyelin, ceratoside, and ganglioside.

[0065] Examples of ceramides include natural ceramides, sphingosine derivatives, and pseudo-ceramides (substances with ceramide-like structures) described in JPS 62-228048A, JPS 63-216812A, JPS 63-227513A, JPS 64-29347A, JPS 64-31752A, JPH8-319263A, etc. These documents are incorporated herein by reference.

[0066] Specific examples of natural ceramides include ceramide Types 1 to 7, in which sphingosine, dihydrosphingosine, phytosphingosine, or sphingadienine is amidated, and further include N-alkylated versions (e.g., N-methylated versions) of these. Specific examples of pseudo-ceramides include (N-hexadecyloxyhydroxypropyl)-N-hydroxyhexadecanamide, (N-hexadecyloxyhydroxypropyl)-N-hydroxydecanamide, N-[2-(2,3-dihydroxypropyloxy)-3-hexadecyloxypropyl]-N-3-methoxypropyltetradecanamide, and N-(hexadecyloxyhydroxypropyl)-N-hydroxyethylhexadecanamide, with N-(hexadecyloxyhydroxypropyl)-N-hydroxyethylhexadecanamide being preferred.

[0067] From the viewpoint of improving the ease of application, improving the moisturizing feeling on the skin after application, and reducing the heat sensation under high temperature and humidity conditions, thereby reducing the burden on the skin, compounds selected from the following general formulas (1) and (2) are preferred, and the compound of general formula (1) is particularly preferred.

[0068]

[0069] (In the formula, R １ represents a hydrocarbon group having 10 to 26 carbon atoms, and R ２ represents a hydrocarbon group having 9 to 25 carbon atoms, and X represents -(CH ２ ) ｎ - (n is an integer from 2 to 6.)

[0070]

[0071] (In the formula, R ３ and R ４ R represents an optionally hydroxylated hydrocarbon group having 1 to 40 carbon atoms, and may be the same or different; ５ represents an alkylene group having 1 to 6 carbon atoms or a single bond, R ６ represents a hydrogen atom, an alkoxy group having 1 to 12 carbon atoms, or a 2,3-dihydroxypropyloxy group, provided that R ５ When is a single bond, R ６ is a hydrogen atom.)

[0072] In the general formulae (1) and (2), the hydrocarbon group is preferably an alkyl group or an alkenyl group.

[0073] An example of a compound of general formula (1) is N-(hexadecyloxyhydroxypropyl)-N-hydroxyethylhexadecanamide (INCI name: Cetyl-PG Hydroxyethyl Palmitamide). An example of a compound of general formula (2) is long-chain dibasic acid-bis-3-methoxypropylamide. The compound represented by general formula (1) is a pseudo-ceramide and a ceramide functional component, which can supplement the function of ceramide and improve skin condition (such as moisture content).

[0074] The content of component (F) in the film-forming composition of the present invention is preferably 5% by mass or more, more preferably 7% by mass or more, and even more preferably 10% by mass or more, from the viewpoints of improving the dispersibility of component (E) in the composition and the durability of the formed film. From the same viewpoints as above, the content of component (F) is preferably 40% by mass or less, more preferably 35% by mass or less, and even more preferably 30% by mass or less.

[0075] The film-forming composition of the present invention may further contain a nonionic surfactant. Examples of nonionic surfactants include sorbitan fatty acid esters and sucrose fatty acid esters. Specific examples of nonionic surfactants include sucrose fatty acid esters, glycerin fatty acid esters, polyglycerin fatty acid esters, sorbitan fatty acid esters, polyoxyethylene sorbitan fatty acid esters, polyoxyethylene glycerin fatty acid esters, ethylene glycol fatty acid esters, polyoxyethylene fatty acid esters, polyalkylene glycol alkyl ethers, polyoxyethylene hydrogenated castor oil, propylene glycol fatty acid esters, glycerin alkyl ethers, fatty acid alkanolamides, fatty acid dialkanolamides, polyoxyethylene sorbitan monostearate, polyether-modified silicones, sorbitan stearate, sorbitan distearate, and fatty acid glyceryls of linear saturated fatty acids having 14 or more carbon atoms.

[0076] In addition to the above-described components, the film-forming composition of the present invention may contain a powder component (excluding component (B)) to the extent that the effects of the present invention are not impaired. Examples of powder components include color pigments, extender pigments, pearlescent 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 dioxide, 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 incorporated. The average particle size of the powder component is greater than 0.1 μm and not greater than 200 μm, so as to ensure uniform adhesion to the skin's ridges, grooves, and pores and to provide a natural cosmetic feel. When the powder component has been hydrophobized or hydrophilized, the average particle size, content, or blend amount of the powder component refers to the average particle size, content, or blend amount, respectively, including the hydrophobized or hydrophilized agent. 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.

[0077] In addition to the components described above, the film-forming composition of the present invention may contain optional components, as appropriate, within the limits that do not impair the effects of the present invention. Optional components include surfactants, water-soluble polymers, pH adjusters, disinfectants, anti-inflammatory agents, preservatives, colorants, chelating agents, whitening agents, antiperspirants, insect repellents, physiologically active ingredients, salts, antioxidants, fragrances, thickeners, etc.

[0078] 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.

[0079] The film-forming composition of the present invention can form a uniform film on human skin by application. Furthermore, a fiber network is formed in this film 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 regenerated cellulose fibers are less likely to aggregate, the composition can be spread evenly upon application. As a result, a fiber network is uniformly formed in the film, improving the durability of the film. Therefore, makeup such as foundation can be applied over the film for extended wear. This suppresses shine caused by sebum. Furthermore, the moisturizing effect is sustained.

[0080] 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.

[0081] 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 (F): (A) an acrylamide polymer; (B) hydrophobic metal oxide fine particles; (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; and (F) a non-volatile oil.

[0082] <2> The film-forming composition for skin according to <1>, wherein the coefficient of variation of the fiber length of the regenerated cellulose fibers of component (E) is 40% or more and 100% or less. <3> The film-forming composition for skin according to <1> or <2>, wherein component (F) contains an oil that is liquid at 25°C. <4> The film-forming composition for skin according to <1> to <3>, wherein component (F) further contains an oil that is solid at 25°C. <5> The film-forming composition for skin according to any one of <1> to <4>, wherein the content of a coloring pigment is 0% by mass or more and 3.5% by mass or less. <6> The film-forming composition for skin according to any one of <1> to <5>, wherein the aspect ratio of the regenerated cellulose fibers of component (E), defined by the average fiber length / average fiber diameter, is 8 or more and 200 or less. <7> The (average fiber diameter) of the regenerated cellulose fibers of component (E) ２ / fiber content (μm ２ <6> The film-forming composition for skin according to any one of <1> to <6>, wherein the ratio (wt%) of the total weight of the polymer to the total weight of the coating is 0.05 or more and 8 or less.

[0083] <8> The film-forming composition for skin according to any one of <1> to <7>, wherein component (A) preferably contains polyacrylamide or an acrylamide copolymer, and more preferably contains a copolymer of an acrylate and an acryloyldimethyltaurate salt. <9> The film-forming composition for skin according to any one of <1> to <8>, wherein the content of component (A) is preferably 0.1% by mass or more and 2% by mass or less. <10> The film-forming composition for skin according to any one of <1> to <9>, wherein component (B) preferably has an average primary particle size of 1 nm to 100 nm, and more preferably 10 to 40 nm. <11> The film-forming composition for skin according to any one of <1> to <10>, wherein the blending amount of component (B) is preferably 1% by mass or more and 30% by mass or less, and more preferably 7% by mass or more and 20% by mass or less. <12> The film-forming composition for skin according to any one of <1> to <11>, wherein component (C) preferably contains one or more selected from ethylene glycol, propylene glycol, 1,3-butylene glycol, dipropylene glycol, polyethylene glycols having a weight-average molecular weight of 1,000 g / mol or less, glycerin, diglycerin, maltitol, and sorbitol. <13> The film-forming composition for skin according to any one of <1> to <12>, wherein the content of component (C) is preferably 0.5% by mass or more and 20% by mass or less.

[0084] <14> The film-forming composition for skin according to any one of <1> to <13>, preferably further comprising component (C') polyethylene glycol that is solid at 25°C. <15> The film-forming composition for skin according to <14>, wherein the content of component (C') is preferably 0.005% by mass or more and 3% by mass or less. <16> The film-forming composition for skin according to any one of <1> to <15>, wherein the content of a powder component 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. <17> The film-forming composition for skin according to any one of <1> to <16>, wherein the average fiber diameter of the regenerated cellulose fibers of component (E) is preferably 0.7 μm or more and 2 μm or less. <18> The film-forming composition for skin according to any one of <1> to <17>, wherein the average fiber length of the regenerated cellulose fibers of the component (E) is preferably 20 μm or more and 150 μm or less.

[0085] <19> The film-forming composition for skin according to any one of <1> to <18>, wherein the blending amount of component (D) is 40% by mass or more and 75% by mass or less. <20> The film-forming composition for skin according to any one of <1> to <19>, wherein the content of the water-insoluble fiber in component (E) is preferably 0.2% by mass or more and 10% by mass or less, more preferably 0.5% by mass or more and 9% by mass or less, even more preferably 0.7% by mass or more and 8% by mass or less, and even more preferably 1% by mass or more and 8% by mass or less. <21> The film-forming composition for skin according to any one of <1> to <19>, wherein component (E) is a component having an average fiber diameter of the regenerated cellulose fiber. ２ / fiber content (μm ２<22> The film-forming composition for skin according to any one of <1> to <20>, wherein the mass ratio (A) / (E) of component (A) to component (E) is preferably from 0.05 to 10, more preferably from 0.1 to 4. <23> The film-forming composition for skin according to any one of <1> to <22>, wherein the mass ratio (A) / (E) of component (A) to component (E) is preferably from 0.05 to 10, more preferably from 0.1 to 4.

[0086] 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."

[0087] Examples 1 to 4: The components shown in Table 1 were blended in the proportions (mass%) shown in the table to obtain oil-in-water compositions. 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 an outlet hole of 0.3 mm diameter, 180 holes, and a hole spacing of 1.1 mm was used, and the cuprammonium cellulose solution was discharged from the outlet hole into warm water at 20°C. The resulting blue yarn was stretched and deammoniated using a flow-down tension spinning method. The blue yarn and the hot water were then separated by pouring 50°C hot water into a semicircular, inclined trough located 20 cm below the funnel outlet. The hot water was then poured 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 (Xtreme 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.

[0088] Comparative Example 1: An oil-in-water composition was obtained by using acrylic resin fibers instead of regenerated cellulose fibers and blending the components shown in Table 3 in the proportions (mass %) shown in the same table. The obtained composition was evaluated as follows. The results are shown in Table 2.

[0089] Comparative Example 2: An oil-in-water composition was obtained by using cellulose nanofibers (CNF) instead of regenerated cellulose fibers and blending the components shown in Table 2 in the proportions (mass%) shown in the same table. The obtained composition was evaluated as follows. The results are shown in Table 2.

[0090] Comparative Example 3 An oil-in-water composition was obtained by blending the components shown in Table 2 in the proportions (% by 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.

[0091] Comparative Example 4 An oil-in-water composition was obtained by blending the components shown in Table 2 in the proportions (% by 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.

[0092] Comparative Example 5 An oil-in-water composition was obtained by blending the components shown in Table 2 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 2.

[0093] Comparative Example 6 An oil-in-water composition was obtained by blending the components shown in Table 2 in the proportions (% by mass) shown in the same table. In this comparative example, component (A) was not blended. The resulting composition was evaluated as follows. The results are shown in Table 2.

[0094] [Easy spreadability of the composition and durability of the film] The film-forming compositions for skin obtained in the Examples and Comparative Examples were applied to the faces of five expert panelists at a concentration of 2 mg / cm. ２The composition was applied to a skin. The ease of spreading of the composition at the time of application was evaluated according to the following criteria. Six hours after application, the presence or absence of creasing in the film was evaluated according to the following criteria. An overall evaluation was made by adding up the scores of both evaluation results. <Spreadability of composition> 5: Good spread (even application) 4: Slightly good spread (little uneven application) 3: Neither 2: Slightly poor spread (slightly uneven application) 1: Poor spread (uneven application) <Film durability> 5: No creasing 4: Little creasing 3: Neither 2: Slight creasing 1: Crinkling <Overall evaluation> ◎: 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

[0095] [Makeup Durability] The film-forming compositions for skin obtained in Examples and Comparative Examples were applied to the faces of five expert panelists at a concentration of 2 mg / cm. ２ The product was applied and allowed to dry for 15 minutes. Foundation was then applied over it. After 6 hours, the duration of the cosmetic effect was evaluated and judged by expert panelists based on the following criteria: ◎: Four or more expert panelists recognized that the cosmetic effect lasted well. ○: Three expert panelists recognized that the cosmetic effect lasted well. △: Two expert panelists recognized that the cosmetic effect lasted well. ×: One or less expert panelists recognized that the cosmetic effect lasted well.

[0096]

[0097]

[0098] As is clear from the results shown in Tables 1 and 2, the compositions obtained in each Example spread well on the skin. It is also clear that the films formed from the compositions obtained in each Example are highly durable. Furthermore, it is clear that when a cosmetic is applied to a film formed from the composition obtained in each Example, the cosmetic lasts longer.

[0099] As described above in detail, the film-forming composition for skin of the present invention suppresses fiber aggregation, thereby forming a uniform fiber network in the film, thereby improving the durability of the film and, as a result, improving the long-lasting makeup effect after applying a cosmetic onto the film.

Claims

1. A film-forming composition for skin containing the following components (A) to (F): (A) an acrylamide polymer; (B) hydrophobic metal oxide fine particles; (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; and (F) an oil agent.

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 of component (E) is 40% or more and 100% or less.

3. The film-forming composition for skin according to claim 1 or 2, wherein component (F) comprises an oil that is liquid at 25°C.

4. The film-forming composition for skin according to claim 1 or 2, wherein component (F) comprises an oil that is solid at 25°C.

5. A film-forming composition for skin according to claim 1 or 2, in which the content of powder components having an average particle size of more than 100 μm is 3.5% by mass or less or 0% by mass.

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

7. (Average fiber diameter) of the regenerated cellulose fiber 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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