Film-forming composition for skin

Abstract

This film-forming composition for skin contains the following components (A) to (E). A phospholipid (A) A sterol ester (B) A C10-24 higher alcohol (C) Water (D) Water-insoluble fibers (E) having an average fiber diameter of 0.3 μm to 5 μm and an average fiber length of 20 μm to 300 μm In the film-forming composition for skin, the mass ratio (B) / (E) of component (B) to component (E) is 1 to 15. The water-insoluble fibers of component (E) preferably have a variation coefficient value of the fiber length of 40% to 100%.

Description

Skin film-forming composition

[0001] The present invention relates to a film-forming composition for skin.

[0002] Various emulsion cosmetics are known. For example, the present applicant previously proposed an oil-in-water emulsion cosmetic containing phospholipids, sterol esters, higher alcohols having from 10 to 24 carbon atoms, and liquid oils (see Patent Document 1). This emulsion cosmetic has a good finish after application, is less sticky, and has excellent emulsion stability.

[0003] The present applicant has also proposed an emulsion composition for topical application to the skin containing nicotinamide, sterol ester, and hydrogenated phospholipid (see Patent Document 2). This emulsion composition has a rich texture but is not sticky, and has excellent storage stability.

[0004] JP 2018-8907 A JP 2021-11448 A

[0005] The present invention relates to a film-forming composition for skin containing the following components (A) to (E), wherein the mass ratio (B) / (E) of component (B) to component (E) is 1 or more and 15 or less: (A) a phospholipid; (B) a sterol ester; (C) a higher alcohol having 10 to 24 carbon atoms; (D) water; and (E) a water-insoluble fiber having an average fiber diameter of 0.3 μm to 5 μm and an average fiber length of 20 μm to 300 μm. Detailed Description of the Invention

[0006] The emulsion cosmetics described in Patent Documents 1 and 2 contain a predetermined amount of a liquid or paste-like oil, and when the emulsion cosmetics are applied to the skin, they can cause noticeable shine after a long period of time. This shine is thought to be caused by the interaction of sebum secreted from the skin with the oil. Therefore, the present invention relates to a film-forming composition for skin that is less likely to cause shine even after a long period of time has passed after application.

[0007] The present invention will be described below based on 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. Films are formed on the surface of skin for purposes such as, but not limited to, beauty, as a makeup base or for makeup application, and for maintaining skin health by moisturizing, protecting the skin from external stimuli, and absorbing and retaining secreted sebum.

[0008] The film-forming composition of the present invention contains a phospholipid (hereinafter also referred to as "component (A)") as a constituent component. Component (A) is incorporated to improve the emulsion stability of the film-forming composition of the present invention and to suppress stickiness after application of the composition. The inventors consider stickiness in this invention to mean the feeling of stickiness, adhesiveness, etc., of the film-forming composition on the skin to which the film-forming composition has been applied. Examples of phospholipids include glycerophospholipids such as lecithin, hydrogenated lecithin, hydroxylated lecithin, phosphatidylethanolamine, phosphatidylserine, phosphatidylcholine, phosphatidylinositol, phosphatidylglycerol, and cardiolipin; and sphingophospholipids such as sphingomyelin, ceratosides, and gangliosides. Of these, hydrogenated lecithin is preferred.

[0009] From the viewpoint of improving the emulsion stability of the film-forming composition of the present invention and suppressing stickiness after application of the composition, the phospholipid preferably has a phosphatidylcholine content of 60% by mass or more, more preferably 64% by mass or more, even more preferably 68% by mass or more, and even more preferably 75% by mass or more. Examples of phospholipid components other than phosphatidylcholine include phosphatidic acid, phosphatidylserine, phosphatidylethanolamine, phosphatidylinositol, and phosphatidylglycerol.

[0010] The phospholipid may be a natural product extracted and purified from animals or plants, or may be chemically synthesized, or may be processed by hydrogenation, hydroxylation, or the like. As natural products, phospholipids that are extracts from soybeans or egg yolks or purified products thereof are preferred from the viewpoint of improving stability over time and reducing skin irritation. More preferred phospholipids are those that have been subjected to hydrogenation or hydroxylation. Specifically, hydrogenated soybean lecithin and / or hydrogenated egg yolk lecithin are preferred.

[0011] The content of phosphatidylcholine in phospholipids can be analyzed by methods using thin layer chromatography (TLC), high performance liquid chromatography (HPLC), Iatroscan (manufactured by Iatron), etc. For example, there is a method described in JP2001-186898A, in which an organic solvent containing phospholipids is spotted on a TLC, developed with chloroform:methanol:acetic acid = 65:25:10, sprayed with 50% by mass sulfuric acid in ethanol, heated, and then analyzed with a densitometer. In addition to the above methods, any method may be used as long as it can measure and calculate the content and percentage of phosphatidylcholine contained in phospholipids.

[0012] Examples of phospholipids containing 60% by mass or more of phosphatidylcholine include Coatsome NC-21 (hydrogenated soybean phospholipid; containing 90% by mass or more of phosphatidylcholine; manufactured by NOF Corporation), Resinol S-10E (hydrogenated soybean phospholipid; containing 75 to 85% by mass of phosphatidylcholine; manufactured by Nikko Chemicals), Resinol S-10EX (hydrogenated soybean phospholipid; containing 95% by mass or more of phosphatidylcholine; manufactured by Nikko Chemicals), Basis LS-60HR (hydrogenated soybean phospholipid; containing 60 to 75% by mass of phosphatidylcholine; manufactured by Nisshin Oillio Co., Ltd.), Phospholipon 85G (soybean phospholipid; containing 85% by mass of phosphatidylcholine; manufactured by H. Holstein Co., Ltd.), and Phospholipon 90G (soybean phospholipid; containing 94% or more by mass; manufactured by H. Holstein Co.), Phospholipon 75IP (soybean phospholipid; containing 70% or more by mass of phosphatidylcholine; manufactured by H. Holstein Co.), Phospholipon 90IP (soybean phospholipid; containing 90% or more by mass of phosphatidylcholine; manufactured by H. Holstein Co.), Phospholipon 80H (hydrogenated soybean phospholipid; containing 70% or more by mass of phosphatidylcholine; manufactured by H. Holstein Co.), Phospholipon 90H (hydrogenated soybean phospholipid; containing 90% or more by mass of phosphatidylcholine; manufactured by H. Holstein Co.), Phospholipon 75HIP (hydrogenated soybean phospholipid; containing 70% or more by mass of phosphatidylcholine; manufactured by H. Holstein Co.), Phospholipon 90HIP (hydrogenated soybean phospholipid; containing 90% or more by mass of phosphatidylcholine; manufactured by H. Holstein), Lipoid E 80 (purified egg yolk phospholipid; containing 80% or more by mass of phosphatidylcholine; manufactured by H. Holstein), Lipoid E 80 S (purified egg yolk phospholipid; containing 64% or more by mass of phosphatidylcholine; manufactured by H. Holstein), Lipoid E PC S (purified egg yolk phospholipid; containing 96% or more by mass of phosphatidylcholine; manufactured by H. Holstein), Epikron 200 (containing 95% or more by mass of phosphatidylcholine; manufactured by Cargill), Phospholipid PCSH70 (hydrogenated phospholipid; containing approximately 70% or more by mass of phosphatidylcholine; manufactured by H. Holstein),Examples include egg yolk lecithin PL-100E (containing about 83% by mass of phosphatidylcholine; manufactured by Nippon Fine Chemical Co., Ltd.), and egg yolk lecithin PL-100E (containing about 83% by mass of phosphatidylcholine; manufactured by Kewpie Corporation). These may be used alone or in combination of two or more.

[0013] The content of component (A) in the film-forming composition of the present invention is preferably 0.05% by mass or more, more preferably 0.1% by mass or more, even more preferably 0.3% by mass or more, and even more preferably 0.5% by mass or more, from the viewpoints of improving emulsion stability and suppressing stickiness and greasiness after application of the composition, and from the same viewpoints, the content of component (A) is preferably 2.5% by mass or less, more preferably 2% by mass or less, even more preferably 1.8% by mass or less, and even more preferably 1.5% by mass or less.

[0014] The film-forming composition of the present invention contains a sterol ester (hereinafter also referred to as "component (B)") as a constituent thereof. Examples of sterols include plant sterols such as campesterol, campestanol, brassicasterol, 22-dehydrocampesterol, stigmasterol, stigmastanol, β-sitosterol, 22-dihydrospinasterol, 22-dehydrostigmastanol, 7-dehydrostigmasterol, tirucallol, euphol, fucosterol, isofucosterol, kojisterol, clionasterol, poriferasterol, clerosterol, 22-dehydroclerosterol, fungisterol, chondrilasterol, avenasterol, vernosterol, and pollinastanol; Examples of sterols include animal sterols such as cholesterol, dihydrocholesterol, cholestanol, coprostanol, epicoprosterol, epicoprostanol, 22-dehydrocholesterol, desmosterol, 24-methylenecholesterol, lanosterol, 24,25-dihydrolanosterol, norlanosterol, spinasterol, dihydroagnosterol, agnosterol, lophenol, and lathosterol; fungal sterols such as dehydroergosterol, 22,23-dihydroergosterol, episterol, ascosterol, and fecosterol, and hydrogenated products thereof. One or more of these sterols may be used. Among these, from the viewpoints of improving emulsion stability and suppressing stickiness after application of the film-forming composition of the present invention, it is preferable to use one or more sterols selected from phytosterols (a mixture containing campesterol, stigmasterol, and β-sitosterol) and cholesterol.

[0015] The sterol ester used in the present invention is not particularly limited as long as it is usable in cosmetics and pharmaceuticals. However, from the viewpoint of improving emulsion stability and suppressing stickiness after application of the film-forming composition of the present invention, it is preferable to use one or more sterol esters selected from acylamino acid sterol / higher alcohol esters, dimer dilinoleic acid sterol / higher alcohol esters, and sterol fatty acid esters.

[0016] From the viewpoints of improving emulsion stability and suppressing stickiness after application of the film-forming composition of the present invention, the phytosterol ester is preferably one or more selected from acylamino acid phytosterol / higher alcohol esters, phytosterol dimer dilinoleate / higher alcohol esters, and phytosterol fatty acid esters. Specifically, from the viewpoints described above, the acylamino acid phytosterol / higher alcohol ester is more preferably one or more selected from di(phytosteryl / octyldodecyl) lauroyl glutamate, di(octyldodecyl / phytosteryl / behenyl) lauroyl glutamate, and myristoylmethyl-β-alanine (phytosteryl / decyltetradecyl).

[0017] From the above-mentioned viewpoints, the phytosterol / higher alcohol dimer dilinoleate ester is more preferably one or more selected from the group consisting of (phytosteryl / behenyl) dimer dilinoleate, (phytosteryl / isostearyl / cetyl / stearyl / behenyl) dimer dilinoleate, dimer dilinoleyl bis(behenyl / isostearyl / phytosteryl) dimer dilinoleate, and di(isostearyl / phytosteryl) dimer dilinoleate.

[0018] From the above-mentioned viewpoints, the phytosterol fatty acid ester is more preferably one or more selected from macadamia nut oil fatty acid phytosteryl, lanolin fatty acid phytosteryl, phytosteryl stearate, phytosteryl isostearate, phytosteryl hydroxystearate, phytosteryl oleate, dihydrophytosteryl oleate, phytosteryl ricinoleate, phytosteryl nonanoate, rice bran oil fatty acid phytosteryl, phytosteryl palmitate, phytosteryl 2-ethylhexanoate, phytosteryl caprate, phytosteryl laurate, and phytosterol butyrate.

[0019] Commercially available phytosterol esters can also be used. Examples of such commercially available products include Eldew PS-203 (di(phytosteryl / octyldodecyl)lauroylglutamate), Eldew PS-304, Eldew PS-306 (di(octyldodecyl / phytosteryl / behenyl)lauroylglutamate), Eldew APS-307 (myristoylmethyl-β-alanine(phytosteryl / decyltetradecyl)) (all manufactured by Ajinomoto Co., Inc.), and Plandoor-MAS (macadamia). fatty acid phytosteryl), Plandoor-ISS (phytosteryl isostearate), Plandoor-S, Plandoor-H (phytosteryl / isostearyl / cetyl / stearyl / behenyl dimer dilinoleate), Plandoor-G (dimer dilinoleyl bis(behenyl / isostearyl / phytosteryl) dimer dilinoleate), Plandoor-SUN (phytosteryl oleate), LUSPLAN PI-DA (di(isostearyl / phytosteryl) dimer dilinoleate) (all manufactured by Nippon Fine Chemicals Co., Ltd.), Salacos FH (phytosteryl hydroxystearate) (all manufactured by Nisshin Oillio Co., Ltd.), and the like.

[0020] As the cholesterol ester, one or more selected from acylamino acid cholesterol / higher alcohol esters and cholesterol fatty acid esters are preferably used from the viewpoint of improving emulsion stability and suppressing stickiness after application of the film-forming composition of the present invention.

[0021] Specifically, from the above viewpoint, it is preferable to use one or more acylamino acid cholesterol / higher alcohol esters selected from di(cholesteryl / behenyl / octyldodecyl) lauroyl glutamate and di(cholesteryl / octyldodecyl) lauroyl glutamate (Estemol CHS).

[0022] From the above viewpoints, it is preferable to use one or more cholesterol fatty acid esters selected from macadamia nut oil fatty acid cholesteryl, cholesteryl hydroxystearate, lanolin fatty acid cholesteryl, branched fatty acid (C12-31) cholesteryl, cholesteryl stearate, cholesteryl hydroxystearate, cholesteryl isostearate, cholesteryl oleate, dihydrocholesteryl oleate, cholesteryl ricinoleate, and cholesteryl nonanoate.

[0023] Commercially available cholesterol esters can also be used. Examples of such commercially available products include Eldew CL-301 (di(cholesteryl / behenyl / octyldodecyl) lauroyl glutamate), Eldew CL-202 (di(cholesteryl / octyldodecyl) lauroyl glutamate) (both manufactured by Ajinomoto Co., Inc.), Salacos HS (cholesteryl hydroxystearate) (manufactured by Nisshin Oillio Co., Ltd.), Ecolano-MAC (cholesteryl macadamiate), Ecolano CLE-S (cholesteryl lanolinate), and Ecolano CLE-NH (cholesteryl branched fatty acid (C12-31)) (all manufactured by Nippon Fine Chemical Co., Ltd.).

[0024] Among the above sterol esters, from the viewpoint of improving emulsion stability and suppressing stickiness after application of the film-forming composition of the present invention, it is preferable to use one or more selected from macadamia nut oil fatty acid phytosteryl, dimer dilinoleate (phytosteryl / isostearyl / cetyl / stearyl / behenyl), di(cholesteryl / octyldodecyl) lauroyl glutamate, cholesteryl lanolinate, and branched fatty acid (C12-31) cholesteryl, and it is even more preferable to use one or more selected from macadamia nut oil fatty acid phytosteryl, branched fatty acid (C12-31) cholesteryl, and cholesteryl lanolinate.

[0025] The content of component (B) in the film-forming composition of the present invention is preferably 2% by mass or more, more preferably 3% by mass or more, even more preferably 3.5% by mass or more, and even more preferably 4% by mass or more, from the viewpoints of improving emulsion stability, suppressing stickiness of the composition after application, and achieving a good finish after application. From the same viewpoints, the content of component (B) is preferably 20% by mass or less, even more preferably 16% by mass or less, even more preferably 12% by mass or less, even more preferably 10% by mass or less, and particularly preferably 8% by mass or less.

[0026] In the film-forming composition of the present invention, the mass ratio of component (B) to component (A) [(B) / (A)] is preferably set to 1.5 or more, more preferably 3 or more, even more preferably 3.5 or more, even more preferably 4 or more, and particularly preferably 4.5 or more, from the viewpoints of improving emulsion stability, suppressing stickiness after application of the composition, and achieving a good finish by suppressing shine after application. From the same viewpoints as above, [(B) / (A)] is preferably set to 25 or less, more preferably 20 or less, even more preferably 16 or less, and even more preferably 14 or less.

[0027] The film-forming composition of the present invention contains a higher alcohol having from 10 to 24 carbon atoms (hereinafter also referred to as "component (C)") as a constituent thereof. Component (C) is incorporated for the purposes of improving the emulsion stability of the film-forming composition of the present invention, suppressing stickiness after application of the composition, and improving the finish after application. For this purpose, the number of carbon atoms in component (C) is preferably from 14 to 24, more preferably from 16 to 22. Component (C) may be either linear or branched, and may be either saturated or unsaturated. From the viewpoint of improving the emulsion stability of the film-forming composition of the present invention and suppressing stickiness after application of the composition, component (C) is preferably a linear or branched saturated higher alcohol, more preferably a linear saturated higher alcohol.

[0028] Specifically, examples of component (C) include myristyl alcohol, cetyl alcohol, stearyl alcohol, arachidyl alcohol, cetearyl alcohol, behenyl alcohol, and carnaubyl alcohol. These alcohols can be contained alone or in appropriate combination of two or more. Among these alcohols, from the viewpoints of improving emulsion stability, suppressing stickiness after application of the composition, and achieving a good finish after application, component (C) preferably contains one or more selected from cetyl alcohol, stearyl alcohol, cetearyl alcohol, arachidyl alcohol, and behenyl alcohol. From the viewpoint of stability, it is more preferable that component (C) contains behenyl alcohol. From the viewpoint of stability, it is even more preferable to use component (C) containing behenyl alcohol.

[0029] The content of component (C) in the film-forming composition of the present invention is preferably 0.1% by mass or more, more preferably 0.5% by mass or more, even more preferably 1% by mass or more, and even more preferably 1.2% by mass or more, from the viewpoints of improving emulsion stability, suppressing stickiness of the composition after application, and achieving a good finish after application. Also, from the same viewpoints, the content of component (C) is preferably 5% by mass or less, more preferably 4% by mass or less, even more preferably 3.5% by mass or less, and even more preferably 3% 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 45% by mass or more, more preferably 48% by mass or more, and even more preferably 50% 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 95% by mass or less, more preferably 90% by mass or less, and even more preferably 85% by mass or less. In the present invention, the inventors consider that "good compatibility with the skin" means a state in which the film-forming composition adheres well to the skin when applied to the skin.

[0031] The film-forming composition of the present invention contains a water-insoluble fiber (hereinafter also referred to as "component (E)") as a constituent component. The water-insoluble fiber is a fiber that has the property that, when 1 g of the fiber is weighed and immersed in 10 g of deionized water under an environment of 1 atmosphere and 23°C, more than 0.5 g of the immersed fiber does not dissolve after 24 hours.

[0032] The water-insoluble fibers preferably have an average fiber diameter of 0.3 μm or more, more preferably 0.4 μm or more, even more preferably 0.5 μm or more, and even more preferably 0.7 μm or more, from the viewpoints of good dispersibility in the composition, ease of fiber network formation, and adhesion of the formed film. Furthermore, from the viewpoints of film durability, good adhesion of the film, and an appropriate size of voids formed between fibers in the film, the average fiber diameter of the water-insoluble fibers is preferably 5 μm or less, even more preferably 4.5 μm or less, even more preferably 4 μm or less, and even more preferably 2 m or less.

[0033] The fiber diameter of water-insoluble fibers refers to the diameter when the cross section of the fiber is circular, and to the major axis when the cross section is elliptical. The fiber diameter can be measured by observing the water-insoluble fibers at 2000x or 5000x magnification using a scanning electron microscope (hereinafter also referred to as "SEM") or an atomic force microscope (hereinafter also referred to as "AFM"), randomly selecting 100 fibers from the two-dimensional image, excluding defects (e.g., fiber clumps, fiber intersections), drawing a line perpendicular to the longitudinal direction of the fibers, and directly reading the fiber diameter. The average fiber diameter is the arithmetic mean of these measurements. When water-insoluble fibers are dispersed in a film, the film-forming composition of the present invention is thinly applied to a substrate and measured by SEM or AFM observation.

[0034] From the viewpoint of strengthening the coating to be formed, it is preferable that the length of the water-insoluble fibers be 20 μm or more in terms of average fiber length. To further enhance this advantage, the average fiber length of the water-insoluble 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 water-insoluble fibers is preferably 300 μm or less, more preferably 250 μm or less, even more preferably 200 μm or less, and even more preferably 150 μm.

[0035] The average fiber length of the water-insoluble fibers is preferably within the above-mentioned range, and the upper limit of the fiber length is preferably 300 μm or less.

[0036] The fiber length of water-insoluble fibers can be measured by observing them under 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 the lengths in the longitudinal direction. The average fiber length is the arithmetic mean of these measurements.

[0037] Water-insoluble 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 water-insoluble 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.

[0038] The water-insoluble 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 water-insoluble 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.

[0039] The CV value is calculated by [standard deviation of fiber length] / [average fiber length]×100[%].

[0040] In order to set the CV value of the water-insoluble fiber within the above range, for example, when the water-insoluble fiber is shortened by the above method, the treatment time, the number of times the fiber is passed through the treatment device, etc. may be controlled.

[0041] From the viewpoint of forming a strong network in the coating and improving the adhesion of the resulting coating, the water-insoluble fibers preferably have a distribution in which the proportion of fibers with a fiber length of 40 μm or more in the total number of fibers is 5% or more. From the viewpoint of making this advantage even more pronounced, the water-insoluble 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 coating, it is even more preferable that the water-insoluble fibers contain 15% or more. From the viewpoint of facilitating the formation of a network in the coating, the water-insoluble fibers preferably have a distribution in which the proportion of fibers with a fiber length of 40 μm or more in the total number of fibers is 100% or less.

[0042] The proportion of water-insoluble fibers with a fiber length of 40 μm or more is 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 is 200 or more.

[0043] The aspect ratio of the water-insoluble 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 adhesiveness of the film formed, provided that the average fiber length and average fiber diameter of the water-insoluble fibers are within the above-mentioned ranges. Furthermore, from the viewpoints of the uniformity of the film, resistance to aggregation, etc., the aspect ratio of the water-insoluble 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.

[0044] Whether or not a network containing water-insoluble 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. It is believed that the retention of these substances between the fibers makes it difficult for oily components in the composition to fall into the skin's sulci, thereby suppressing stickiness.

[0045] From the viewpoints of the durability of the formed film and the 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, still more preferably 1% by mass or more, and even more preferably 1.5% by mass or more. Also, 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, even more preferably 9% by mass or less, even more preferably 8% by mass or less, and even more preferably 6% by mass or less.

[0046] 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 diameter ２ / fiber content (μm ２ / % by mass is preferably in the range of 0.03 to 8. The fiber content means the mass % of fibers in the film-forming composition. (Average fiber diameter) ２ / fiber content (μm ２The 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 0.05 or more, more preferably 0.1 or more, even more preferably more than 0.2, still 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.

[0047] From the viewpoint of enhancing the water insolubility of the fiber, it is preferable that the fiber of component (E) is a fiber containing a thermoplastic resin or a cellulose fiber. When cellulose fiber is used as the fiber of component (E), the cellulose fiber is preferably regenerated cellulose. Regenerated cellulose fiber is natural cellulose fiber that has been dissolved once by chemical treatment and then reconstituted into cellulose. The regenerated cellulose may be unmodified cellulose fiber or modified cellulose fiber. From the viewpoint of enhancing dispersibility in an aqueous phase and salt tolerance, it is more preferable that the proportion of unmodified cellulose in the regenerated cellulose is 85% by mass or more. Unmodified cellulose fiber refers to a regenerated cellulose fiber in which the hydroxyl group at the C6 position of each glucose unit in the cellulose molecule is not substituted with another substituent.

[0048] The fibers of component (E) can be produced by a method including a step of shortening fibers obtained by spinning a fiber-forming polymer using various known spinning techniques. The fiber-forming polymer is usually a thermoplastic or solvent-soluble chain polymer, preferably a thermoplastic resin, having a weight-average molecular weight of 1.0 x 10 ４ g / mol to 2.0 x 10 ５ g / mol thermoplastic resin is more preferred.

[0049] When measuring the weight average molecular weight of a biodegradable polyester using, for example, gel permeation chromatography, the weight average molecular weight of a thermoplastic resin can be measured as a polystyrene-equivalent weight average molecular weight according to the following conditions: As polystyrene standard samples, polystyrene samples with known weight average molecular weights and different weight average molecular weights (for example, monodisperse polystyrenes manufactured by Tosoh Corporation (model numbers: F450, F288, F128, F80, F40, F20, F10, F4, F1, A5000, A2500, A1000, A500, and A300)) can be used to prepare a molecular weight calibration curve in advance, and the results of the measurement samples can be compared with the calibration curve.

[0050] <Gel Permeation Chromatography Conditions> Measurement apparatus: HLC-8220GPC (manufactured by Tosoh Corporation) Column: GMHHR-H + GMHHR-H (manufactured by Tosoh Corporation) Eluent: 1 mmol Farmin DM20 (manufactured by Kao Corporation) / CHCl ３ Eluent flow rate: 1.0 mL / min Column temperature: 40°C Detector: RI Sample concentration: 0.1% by volume (chloroform solution) Sample injection volume: 100 mL

[0051] Water-insoluble fibers can be obtained by using a water-insoluble polymer as the fiber-forming polymer. Examples of water-insoluble polymers include fully saponified polyvinyl alcohol, which can be insolubilized after film formation, partially saponified polyvinyl alcohol, which can be crosslinked after film formation by using a crosslinking agent in combination, oxazoline-modified silicones such as poly(N-propanoylethyleneimine) graft-dimethylsiloxane / γ-aminopropylmethylsiloxane copolymer, polyester resins such as polyvinyl acetal diethylaminoacetate, zein (a major component of corn protein), polylactic acid (PLA), and 3-hydroxybutyrate-3-hydroxyhexanoate copolymer (PHBH), polybutylene succinate, and polyglycol. Examples of water-insoluble polymers include acrylic resins such as carboxylic acid, polycaprolactone, polyhydroxyalkanoic acid, polyacrylonitrile resin, and polymethacrylic acid resin, polystyrene resin, polyvinyl butyral resin, polyvinyl acetal resin, polyethylene terephthalate resin (PET), polybutylene terephthalate resin, polyurethane resin, polyamide resin, polyimide resin, polyamideimide resin, polyolefin resin (polypropylene resin, polyethylene resin, etc.), various water-insoluble polypeptides (collagen, gelatin, fibrin, casein, silk, etc.), and water-insoluble polysaccharides or derivatives thereof (cellulose-based polymers, etc.). These water-insoluble polymers can be used alone or in combination of two or more.

[0052] Of these water-insoluble polymers, it is preferable to use one or more selected from fully saponified polyvinyl alcohol, which can be insolubilized after film formation, partially saponified polyvinyl alcohol, which can be crosslinked after film formation by using a crosslinking agent in combination, acrylic resins such as polymethacrylic acid resins, polyvinyl butyral resins, polyurethane resins, polylactic acid (PLA), oxazoline-modified silicones such as poly(N-propanoylethyleneimine) graft-dimethylsiloxane / γ-aminopropylmethylsiloxane copolymers, polyvinyl acetal diethylaminoacetate, zein, polyolefin resins, and cellulose-based polymers.

[0053] Among these, from the viewpoint of the adhesiveness of the resulting film, one or more selected from polyvinyl butyral resin, acrylic resin, polylactic acid, polyurethane resin, polyolefin resin, and cellulose-based polymer are more preferred.

[0054] Preferred acrylic resins include methacrylic acid / methyl methacrylate copolymers (methacrylic acid copolymer S (e.g., Eudragit S100, manufactured by Evonik), methacrylic acid copolymer L (e.g., Eudragit L100, manufactured by Evonik), etc.), methyl acrylate / methyl methacrylate / methacrylic acid polymers (e.g., Eudragit FS30D, manufactured by Evonik), octyl acrylic acid / alkyl acrylate ester copolymers (e.g., DERMACRYL 79, manufactured by Nouryon), methacrylic acid / alkyl methacrylate / dimethylpolysiloxane block copolymers (e.g., MyBlock Wako 101, manufactured by Fujifilm Wako Pure Chemical Industries, Ltd.), and methacrylic acid / 1,1-dimethylethyl acrylate / ethyl acrylate copolymers (e.g., Luvimer 100P, manufactured by BASF SE).

[0055] Examples of polyolefin resins include polyethylene (PE), polypropylene (PP), and polystyrene (PS).

[0056] Examples of water-insoluble polysaccharides or derivatives thereof include methylcellulose, ethylcellulose, methylhydroxypropylcellulose, carboxymethylcellulose, hydroxymethylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, nitrocellulose, sodium cellulose sulfate, sodium carboxymethylcellulose, crystalline cellulose, cellulose powder, hydroxyethylcellulose hydroxypropyl stearyl ether sodium hydroxypropylsulfonate, TEMPO (2,2,6,6-tetramethylpiperidine-1-oxyl radical) oxidized cellulose, regenerated cellulose (rayon, cupra, etc.), cellulose-based polymers such as hypromellose phthalate and hypromellose acetate succinate, chitosan, chitin, etc. Of these, hypromellose phthalate and hypromellose acetate succinate are preferred.

[0057] In particular, from the viewpoint of SDGs and ESG, it is preferable to use an environmentally friendly resin. Examples of environmentally friendly resins include biodegradable resins and natural polymers.

[0058] Preferred biodegradable resins are polylactic acid, polybutylene succinate, polyglycolic acid, polycaprolactone, polyhydroxyalkanoic acid, 3-hydroxybutyrate-3-hydroxyhexanoate copolymer, cellulose polymer, regenerated cellulose, and polypeptide. In this specification, "biodegradable" means that the degree of biodegradation of the resin measured in accordance with JIS K6953-1 is 30% or more.

[0059] Examples of natural polymers include water-insoluble polypeptides (collagen, gelatin, fibrin, casein, silk, etc.), water-insoluble polysaccharides (cellulose-based polymers, chitosan, chitin, etc.), and the like.

[0060] In the film-forming composition of the present invention, the mass ratio (B) / (E) of component (B) to component (E) is preferably 1 or greater, from the viewpoint of improving application properties and compatibility with the skin. To further enhance this advantage, the ratio (B) / (E) is more preferably 1.2 or greater, and even more preferably 1.5 or greater. Furthermore, from the viewpoint of improving sustainability, the ratio (B) / (E) is preferably 16 or less, even more preferably 14 or less, even more preferably 12 or less, and even more preferably 8 or less. The inventors consider the application properties of the film-forming composition in this invention to mean the property of spreading the film-forming composition evenly and smoothly without causing any discomfort such as friction when applied to the skin.

[0061] 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, more preferably 0.1 or more, and even more preferably 0.3 or more, from the viewpoints of emulsion stability, suppression of stickiness, and suppression of shine after application of the film-forming composition, etc. Furthermore, from the viewpoints of ensuring emulsion stability while ensuring effects such as a feeling of use such as stickiness and suppression of shine, the mass ratio (A) / (E) is preferably 12.5 or less, more preferably 8 or less, and even more preferably 5 or less.

[0062] In the film-forming composition of the present invention, the mass ratio (C) / (E) of component (C) to component (E) is preferably 0.05 or more, more preferably 0.1 or more, and even more preferably 0.2 or more, from the viewpoints of improving emulsion stability, suppressing stickiness of the composition after application, and ensuring a good finish after application. Furthermore, from the viewpoints of improving emulsion stability, suppressing stickiness of the composition, and ensuring a good finish after application, the mass ratio (C) / (E) is preferably 20 or less, more preferably 8 or less, even more preferably 5 or less, even more preferably 3 or less, and even more preferably 2 or less.

[0063] In the film-forming composition of the present invention, the mass ratio (A+B+C) / (E) of the sum of components (A), (B), and (C) to component (E) is preferably at least 1, and more preferably at least 2, from the viewpoints of improving emulsion stability, suppressing stickiness after application of the composition, and ensuring a good finish after application. Furthermore, from the viewpoints of improving emulsion stability, suppressing stickiness after application of the composition, and ensuring a good finish after application, the mass ratio (A+B+C) / (E) is preferably at most 50, more preferably at most 17, even more preferably at most 12, and even more preferably at most 8.

[0064] The film-forming composition of the present invention may contain other components in addition to the components described above, such as nonionic surfactants, ionic surfactants, polyhydric alcohols that are liquid at 25°C or sugar alcohols, and oils that are liquid at 20°C.

[0065] 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 ultraviolet absorbers, water-soluble polymers, pH adjusters, disinfectants, anti-inflammatory agents, preservatives, colorants, chelating agents, whitening agents, antiperspirants, insect repellents, physiologically active ingredients, salts, antioxidants, fragrances, powder components, thickeners, etc.

[0066] Examples of the ultraviolet absorber include organic ultraviolet absorbers such as benzoic acid-based ultraviolet absorbers, anthranilic acid-based ultraviolet absorbers, salicylic acid-based ultraviolet absorbers, cinnamic acid-based ultraviolet absorbers, benzophenone-based ultraviolet absorbers, and triazine-based ultraviolet absorbers. Among these, from the viewpoints of ultraviolet protection effect, less stickiness after application, stability over time, etc., one or more selected from benzoic acid-based ultraviolet absorbers and triazine-based ultraviolet absorbers are preferred. Furthermore, as the ultraviolet absorber, an oil-soluble organic ultraviolet absorber is preferred.

[0067] 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.

[0068] 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 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.

[0069] In addition to the above-described components, the film-forming composition of the present invention may contain a powder component within a range that does not impair the effects of the present invention. 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 preferably greater than 0.1 μm and not greater 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 to impart a natural cosmetic feel. In addition, when the powder component is hydrophobized or hydrophilized, the average particle size and content or blending amount of the powder component respectively refer to the average particle size and content or blending amount including the agent that has been hydrophobized or hydrophilized. From the viewpoint of ensuring the effects of the present invention, the content or blending amount of the powder component 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 50% cumulative volume measured by 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.

[0070] The film-forming composition of the present invention can be produced by conventional methods by mixing the above-mentioned components, heating as necessary. The film-forming composition of the present invention produced in this manner is preferably an oil-in-water emulsion. In this case, the water-insoluble fiber, component (E), is preferably present mainly in the aqueous phase. However, this does not prevent the water-insoluble fiber, component (E), from being present in the oil phase.

[0071] 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. Furthermore, the uniform formation of a fibrous network in the resulting film improves the durability of the film. Furthermore, the appearance of the film is improved. Furthermore, when a makeup base or foundation is applied over the film, the makeup of the applied cosmetics lasts longer.

[0072] The film-forming composition of the present invention can be applied to the skin by, for example, applying it with the fingers, applying it by spraying, applying it with a tool such as a roller or sponge, or applying a stick-shaped solid cosmetic. In the film formed on the surface of the skin, the oily components are held between the fibers, resulting in good uniformity and durability of the film on the skin. In addition, the film is prevented from feeling sticky for a long period of time. Furthermore, due to the high density of the film, the feeling of firmness is improved and external irritation is suppressed by the film. In addition, the film is prevented from becoming shiny over time after formation. The thickness of the film depends on the amount applied, but it is within the range of normal use (a 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.

[0073] In relation to the above-described embodiment, the present invention further discloses the following film-forming composition for skin. <1> The film-forming composition for skin contains the following components (A) to (E): (A) a phospholipid; (B) a sterol ester; (C) a higher alcohol having from 10 to 24 carbon atoms; (D) water; and (E) a water-insoluble fiber having an average fiber diameter of from 0.3 μm to 5 μm and an average fiber length of from 20 μm to 300 μm. The mass ratio (B) / (E) of component (B) to component (E) is from 1 to 15.

[0074] <2> The film-forming composition for skin according to <1>, wherein the water-insoluble fibers of component (E) have a coefficient of variation of fiber length of 40% or more and 100% or less. <3> The film-forming composition for skin according to <1> or <2>, wherein the water-insoluble fibers of component (E) have an aspect ratio defined by average fiber length / average fiber diameter of 8 or more and 200 or less. <4> The (average fiber diameter) of the water-insoluble fibers of component (E) ２ / fiber content (μm ２ <1> The film-forming composition for skin according to any one of <1> to <3>, wherein the water-insoluble fiber of component (E) is a fiber containing a thermoplastic resin or a cellulose fiber. <6> The film-forming composition for skin according to <5>, wherein the cellulose fiber is an unmodified cellulose fiber.

[0075] <7> (Average fiber diameter) of the water-insoluble fiber of component (E) ２ / fiber content (μm ２<1> The film-forming composition for skin according to any one of <1> to <6>, wherein the % saturation index (SAR) / mass % is more than 0.2 and not more than 8, more preferably more than 0.25 and not more than 7. <8> The film-forming composition for skin according to any one of <1> to <7>, wherein component (A) preferably contains hydrogenated lecithin, and more preferably has a phosphatidylcholine content of 60% by mass or more. <9> The film-forming composition for skin according to any one of <1> to <8>, wherein the content of component (A) is preferably 0.05% by mass or more and not more than 2.5% by mass. <10> The film-forming composition for skin according to any one of <1> to <9>, wherein component (B) preferably contains, as a sterol, one or more sterols selected from phytosterols (a mixture containing campesterol, stigmasterol, and β-sitosterol) and cholesterol. <11> The film-forming composition for skin according to any one of <1> to <10>, wherein the content of component (B) is preferably 2% by mass or more and not more than 10% by mass.

[0076] <12> The film-forming composition for skin according to any one of <1> to <11>, wherein component (C) is preferably a linear or branched saturated higher alcohol, and more preferably contains one or more selected from cetyl alcohol, stearyl alcohol, cetearyl alcohol, arachidyl alcohol, and behenyl alcohol. <13> The film-forming composition for skin according to any one of <1> to <12>, wherein the content of component (C) is preferably 0.1% by mass to 5% by mass, and more preferably 1.2% by mass to 3% by mass. <14> The film-forming composition for skin according to any one of <1> to <13>, wherein the content of the water-insoluble fiber of component (E) is preferably 0.2% by mass to 10% by mass, more preferably 0.5% by mass to 9% by mass, even more preferably 0.7% by mass to 8% by mass, still more preferably 1% by mass to 6% by mass, and particularly preferably 1.5% by mass to 6% by mass. <15> The film-forming composition for skin according to any one of <1> to <14>, wherein the average fiber diameter of the water-insoluble fibers of component (E) is preferably 0.7 μm or more and 2 μm or less. <16> The film-forming composition for skin according to any one of <1> to <15>, wherein the average fiber length of the water-insoluble fibers of component (E) is preferably 20 μm or more and 150 μm or less. <17> The film-forming composition for skin according to any one of <1> to <16>, wherein the 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. <18> The film-forming composition for skin according to any one of <1> to <17>, wherein the mass ratio (A) / (E) of the content of component (A) to component (E) is preferably 0.05 to 12.5, more preferably 0.1 to 8. <19> The film-forming composition for skin according to any one of <1> to <18>, wherein the mass ratio (C) / (E) of the content of component (C) to component (E) is preferably 0.05 or more and 20 or less, more preferably 0.1 or more and 8 or less, even more preferably 0.1 or more and 5 or less, still more preferably 0.1 or more and 3 or less, and even more preferably 0.2 or more and 3 or less.<20> The film-forming composition for skin according to any one of <1> to <19>, wherein the mass ratio (A+B+C) / (E) of the sum of the components (A), (B) and (C) to the component (E) is preferably 1 or more and 50 or less, more preferably 2 or more and 17 or less, even more preferably 2 or more and 12 or less, and still more preferably 2 or more and 8 or less.

[0077] 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."

[0078] Example 1 Acrylic resin A (octylacrylamide / hydroxypropyl acrylate / butylaminoethyl methacrylate copolymer) was dissolved in ethanol to obtain an 18% solution. Using this solution, a nanofiber sheet was formed on the surface of a collector using the electrospinning apparatus described in Figure 3 of JP2010-168722A. The nanofiber production conditions were as follows: Applied voltage: 30 kV Capillary-collector distance: 150 mm Aqueous solution discharge rate: 12 mL / hour Environment: 25°C, 30% RH The obtained nanofiber sheet was appropriately cut, and then attached to a stirring system (manufactured by Primix Corporation, Lavortion (registered trademark)) with a dispersing blade, and pulverized at 5000 rpm for 30 minutes to obtain water-insoluble fibers. The components shown in Table 1, including the water-insoluble fibers obtained in this way, were blended in the proportions (mass%) shown in the same table to obtain an oil-in-water composition.

[0079] [Examples 2 to 15] Oil-in-water compositions were obtained in the same manner as in Example 1, except that the components shown in Tables 1 and 2 were blended in the proportions (% by mass) shown in the same tables. The fiber diameter of the fibers used in each example was adjusted by changing the concentration of the acrylic resin A solution used during electrospinning.

[0080] Example 16 Methacrylic acid B (methacrylic acid copolymer S (Eudragit S100, manufactured by Evonik)) was dissolved in ethanol and DMSO (mass ratio 80:30) to obtain a 16% solution. Using this solution, a nanofiber sheet was formed on the surface of a collector using the electrospinning apparatus described in Figure 3 of JP2010-168722A. The nanofiber production conditions were as follows: Applied voltage: 30 kV Capillary-collector distance: 800 mm Aqueous solution discharge rate: 20 g / hour Environment: 25°C, 30% RH The obtained nanofiber sheet was appropriately cut, and then a disperser blade was attached to a stirring system (Laborution (registered trademark), manufactured by Primix Corporation) and sheared at a rotation speed of 3000 rpm for 3 minutes to obtain water-insoluble fibers. The components shown in Table 2, including the water-insoluble fiber thus obtained, were blended in the proportions (mass %) shown in the same table to obtain oil-in-water compositions.

[0081] Examples 17 to 20: Regenerated cellulose fibers were used as the water-insoluble fibers, and the components shown in Table 2 were blended in the proportions (mass%) shown in the table to obtain oil-in-water compositions. 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 Regenerated 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 a hole diameter of 0.3 mm, 180 holes, and a hole spacing of 1.1 mm was used, and the cuprammonium cellulose solution was discharged from the nozzle 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 to separate the blue yarn and the hot water. The blue yarn was then 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 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 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.

[0082] Comparative Example 1 An oil-in-water composition was obtained by blending the components shown in Table 3 in the proportions (mass %) shown in the same table. In this comparative example, component (E) was not blended.

[0083] Comparative Example 2 An oil-in-water composition was obtained by blending the components shown in Table 3 in the proportions (% by mass) shown in the same table. In this comparative example, component (C) was not blended.

[0084] Comparative Example 3 An oil-in-water composition was obtained by blending the components shown in Table 3 in the proportions (mass %) shown in the same table. In this comparative example, component (B) was not blended.

[0085] Comparative Example 4 An oil-in-water composition was obtained by blending the components shown in Table 3 in the proportions (mass %) shown in the same table. In this comparative example, component (A) was not blended.

[0086] Comparative Examples 5 and 6 Oil-in-water compositions were obtained by using cellulose nanofibers (CNF) as the water-insoluble fiber and blending the components shown in Table 3 in the proportions (mass %) shown in the same table.

[0087] Comparative Example 7 Polyamide staple fibers manufactured by Cosmeticals Co., Ltd. were used as the water-insoluble fibers, and the components shown in Table 3 were blended in the proportions (mass %) shown in the same table to obtain an oil-in-water composition.

[0088] [Evaluation] The oil-in-water compositions obtained in the Examples and Comparative Examples were evaluated as follows, and the results are shown in Tables 1 to 3.

[0089] [Long-term suppression of stickiness] An oil-in-water composition was applied to the face of 10 expert panelists, who were asked to evaluate the degree of stickiness of the film immediately after application and 8 hours later based on the following criteria, and the degree of stickiness suppression was determined based on the total score. [Evaluation] 1: Stickiness was felt immediately after application. 2: No stickiness was felt immediately after application, but a considerable stickiness was felt 8 hours later. 3: No stickiness was felt immediately after application, but a slight stickiness was felt 8 hours later. 4: No stickiness was felt immediately after application and after 8 hours. [Judgment] ◎: Total score of 35 points or more ○: Total score of 30 points or more but less than 35 points △: Total score of 25 points or more but less than 30 points ×: Total score less than 25 points

[0090] [Shine Suppression] An oil-in-water composition was applied to the face of 10 expert panelists, who were asked to evaluate the presence or absence of shine due to sebum immediately after application and 8 hours later based on the following criteria, and the degree of shine suppression was determined based on the total score. [Evaluation] 1: Shine was observed immediately after application. 2: No shine was observed immediately after application, but considerable shine was observed 8 hours later. 3: No shine was observed immediately after application, but some shine was observed 8 hours later. 4: No shine was observed both immediately after application and 8 hours later. [Judgment] ◎: Total score is 35 points or more ○: Total score is 30 points or more but less than 35 points △: Total score is 25 points or more but less than 30 points ×: Total score is less than 25 points

[0091]

[0092]

[0093]

[0094] As is clear from the results shown in Tables 1 to 3, the films formed from the compositions obtained in each Example are found to be less sticky for a long period of time. Furthermore, the films formed from the compositions obtained in each Example are found to be less shiny.

[0095] As described above in detail, the film-forming composition for skin of the present invention can suppress the occurrence of shine even after the passage of time after application, despite the inclusion of an oily component.

Claims

1. A film-forming composition for skin containing the following components (A) to (E): (A) a phospholipid; (B) a sterol ester; (C) a higher alcohol having 10 to 24 carbon atoms; (D) water; and (E) a water-insoluble fiber having an average fiber diameter of 0.3 μm to 5 μm and an average fiber length of 20 μm to 300 μm. The mass ratio (B) / (E) of component (B) to component (E) is 1 to 15.

2. The film-forming composition for skin according to claim 1, wherein the water-insoluble fiber of component (E) has a coefficient of variation of fiber length of 40% or more and 100% or less.

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

4. (Average fiber diameter) of the water-insoluble fiber of 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 0.03 or more and 8 or less.

5. A film-forming composition for skin according to claim 1 or 2, wherein the water-insoluble fiber of component (E) is a fiber containing a thermoplastic resin or a cellulose fiber.

6. The film-forming composition for skin according to claim 5, wherein the regenerated cellulose fibers are unmodified cellulose fibers.

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