Components for creating high-resolution coating films and short fibers.

Abstract

DEPCT65 The current invention provides a fine fibrous component for creating a coating film. This component has excellent surface dispersion capabilities and produces a highly effective coating film. A very good, consistent texture when applied to the skin. A component for creating a coating film consisting of components (a) and (b). The following: (a) Fibers of 0.5 percent by mass or more and 10 percent by mass or That's even less than the total diameter of the components required to create this fiber-coated film. The average fiber thickness is 0.1 micrometers or more, and 7 micrometers or less, and the ratio... Characteristics [(average fiber length) / (average fiber diameter)] 8 or more and 300. Or less than that; and (b) Volatile components at 15 percent by mass or more and 90 percent By mass, or less, when compared to the total components for creating the coating film. [(Average fiber diameter)² / (fiber quantity)](square micrometers / percentage) By mass, the amount of this element is 0.005 or more and 7 or less, and the quantity... The total sum of component (a) and component (b) is 97 percent by mass, or Less than that -----------------------------------------------------------

Description

Film-forming composition and ultrafine short fibers

[0001] The present invention relates to a film-forming composition that can form a film containing fine fibers on the surface of the skin.

[0002] Furthermore, the present invention relates to ultrafine short fibers for forming thin films, which are useful in cosmetics, topical skin preparations, coatings, and the like.

[0003] The technique of incorporating fibers into cosmetics is well known and is widely used in products such as mascara. Furthermore, a composition (Patent Document 1) has been reported that contains fibers and a copolymer containing carboxylate groups and polydimethylsiloxane groups in a physiologically acceptable medium for the purpose of applying makeup to keratinous substances such as skin. In addition, a technique of incorporating fibers into cosmetics to reduce the irritation of cosmetics containing irritating ingredients has also been reported. Moreover, a skin cosmetic (Patent Document 3) containing short fibers with a length of 0.1 to 5 mm has been reported to improve the longevity of makeup.

[0004] Furthermore, ultrafine short fibers are being studied for use as fillers in thin films in fields such as cosmetics, pharmaceuticals, and electronic materials. For example, a fiber dispersion (Patent Document 4) has a number-average diameter of 1 to 500 nm and a sum Pa of the ratio of such single fibers of 60% or more; ultrafine short fibers (Patent Document 5) have an average fiber diameter of 1000 nm or less, an average fiber length of 20 μm or less, and a CV value of the fiber length of 55% or less; a method for producing short fibers with an average diameter of 50 nm to 10 μm and an average length of 1 to 50 μm by cutting with a blade located at the interface or intermediate phase of two or more liquid phases (Patent Document 6); and short fibers (Patent Document 7) have coefficients of variation of fiber diameter and fiber length of 0 to 15 and 0 to 20, respectively.

[0005] (Patent Document 1) Japanese Unexamined Patent Publication No. 2002-193746 (Patent Document 2) Japanese Unexamined Patent Publication No. 2002-293718 (Patent Document 3) Japanese Unexamined Patent Publication No. Hei 7-196440

[0006] (Patent Document 4) Japanese Unexamined Patent Publication No. 2005-320506 (Patent Document 5) Japanese Unexamined Patent Publication No. 2009-114560 (Patent Document 6) Japanese Unexamined Patent Publication No. 2012-52271 (Patent Document 7) Japanese Unexamined Patent Publication No. 2007-92235

[0007] The present invention relates to a film-forming composition containing the following components (a) and (b): (a) Fibers with an average fiber diameter of 0.1 μm or more and 7 μm or less, and an aspect ratio (average fiber length / average fiber diameter) of 8 or more and 300 or less, in an amount of 0.5% to 10% by mass of the entire film-forming composition; and (b) Volatile components, in an amount of 15% to 90% by mass of the entire film-forming composition. The present invention preferably relates to (average fiber diameter) 2 / fiber content (μm 2 The mass %) is 0.005 or more and 7 or less. Preferably, in this invention, the total content of component (a) and component (b) is 97% by mass or less.

[0008] The present invention also relates to a method for producing a film on the skin surface, comprising the step of applying the aforementioned film-forming composition to the skin.

[0009] The present invention also relates to short fibers for thin film formation containing short fibers with an average fiber diameter of 0.1 μm or more and 7 μm or less. Preferably, the present invention provides short fibers with an average fiber length of 20 μm or more and 300 μm or less. Preferably, the present invention provides short fibers with a CV value of fiber length of 40% or more and 100% or less. Preferably, the present invention provides short fibers in which the proportion of fibers with a fiber length of 40 μm or more in the total fiber is 5% or more.

[0010] Furthermore, the present invention relates to a method for producing short fibers, which includes a step of shortening nanofibers produced by an electrospinning method.

[0011] This is a schematic diagram showing the configuration of the electrostatic spraying apparatus used to form the fibers of component (a). Reference examples of SEM images with network formation are shown. Reference examples of SEM images without network formation are shown. Other reference examples of SEM images with network formation are shown. Other reference examples of SEM images without network formation are shown. Detailed description of the invention

[0012] The fibers used in Patent Documents 1 and 2 are thick, with a diameter of 0.9 dtex (= 10.7 μm), and have a low fiber content. As a result, a fiber network is not formed, leading to problems with the applicability of the composition and the uniformity of the cosmetic film. Similarly, the skin cosmetic composition in Patent Document 3 also has a low fiber content, resulting in a lack of fiber network formation and problems with the uniformity of the resulting cosmetic film. Therefore, the present invention provides a film-forming composition that contains fine fibers, has good applicability, and exhibits excellent uniformity of the film obtained when applied to the skin.

[0013] Furthermore, the short fibers described in Patent Documents 4 to 7 primarily focus on selectively producing fibers with a small distribution of fiber length. While this improves the strength of the resulting thin film when dispersed in a thin film, it has the problem that the short fibers do not easily form a network structure in the thin film, thus failing to provide sufficient adhesion to the thin film. Therefore, the present invention provides short fibers for thin film formation that, when dispersed in a thin film, can form a dense network structure and provide adhesion to the resulting thin film.

[0014] By using the film-forming composition of the present invention, a film with excellent adhesion and durability can be easily formed.

[0015] Furthermore, by using the short fibers of the present invention, the short fibers form a network structure in the resulting thin film, providing the thin film with excellent adhesion.

[0016] The film-forming composition of the present invention contains the following components (a) and (b): (a) Fibers with an average fiber diameter of 0.1 μm or more and 7 μm or less, and an aspect ratio (average fiber length / average fiber diameter) of 8 or more and 300 or less; (b) A volatile component.

[0017] Component (a) is a fiber with an average fiber diameter of 0.1 μm to 7 μm and an aspect ratio (average fiber length / average fiber diameter) of 8 to 300. Component (a) forms a network within the formed film, providing uniformity and adhesion to the film. Whether or not the fibers form a network within the film can be confirmed by scanning electron microscopy (SEM). A network is a state in which fibers dispersed within the film intersect with each other, creating gaps, and these gaps can hold components contained in the film-forming composition.

[0018] The fiber diameter is, in principle, the diameter of the fiber's cross-section. Here, if the fiber's cross-section is circular, it is the diameter; if the cross-section is elliptical, it is the major axis. The average fiber diameter of the fibers used in this invention is 0.1 μm to 7 μm from the viewpoint of uniformity of the formed film. Considering the practical blending amount, it is preferably 0.2 μm or more, and more preferably 0.3 μm or more. Furthermore, from the viewpoint of increasing the capillary force of the fibers and improving adhesion, it is preferably 5 μm or less, more preferably 4 μm or less, and even more preferably 3 μm or less. The fiber diameter can be measured by observing the fibers under SEM magnification at 2000x or 5000x, selecting 100 fibers arbitrarily from the two-dimensional image after removing defects (e.g., fiber clumps, fiber intersections), drawing lines perpendicular to the longitudinal direction of the fibers, and directly reading the fiber diameter. The average fiber diameter is obtained by calculating the arithmetic mean of these measured values. Since the fibers are dispersed in the film-forming composition, the film-forming composition is thinly applied to the substrate and measured by SEM observation.

[0019] From the viewpoint of uniformity of the formed coating and adhesion of the resulting thin film, the average fiber length is preferably 20 μm to 300 μm. From the viewpoint of facilitating network formation, it is more preferably 25 μm or more, even more preferably 30 μm or more, and even more preferably 40 μm or more. Furthermore, from the viewpoint of suppressing entanglement and twisting of fibers when applying the composition, it is more preferably 250 μm or less, even more preferably 200 μm or less, and especially preferably 150 μm or less. The fiber length can be measured by observing the fiber under SEM magnification of 250 to 750 times depending on the fiber length, selecting 100 fibers arbitrarily from the two-dimensional image after removing defects (e.g., fiber clumps, fiber intersections), drawing a line in the longitudinal direction of the fiber, and directly reading the fiber length. The average fiber length is obtained by calculating the arithmetic mean of these measured values.

[0020] The aspect ratio (average fiber length / average fiber diameter) of the fibers is between 8 and 300 from the viewpoint of uniformity of the formed film and durability of the film due to the formation of a uniform network. From the viewpoint of uniformity of the formed film and durability of the film due to the formation of a uniform network, an aspect ratio of 10 or more is preferable, 15 or more is more preferable, 20 or more is even preferable, 25 or more is particularly preferable, and 40 or more is especially preferable from the viewpoint of increasing fiber entanglement and improving the strength of the thin film. Furthermore, from the viewpoint of uniformity of the formed film and durability of the film due to the formation of a uniform network, an aspect ratio of 250 or less is more preferable, and 200 or less is even preferable. The aspect ratio as used herein is not a value for a single fiber, but a value calculated from the average fiber diameter obtained according to the fiber diameter measurement method and the average fiber length obtained according to the fiber length measurement method.

[0021] The coefficient of variation (CV) of the fiber length of the fibers in component (a) is preferably 40% to 100% from the viewpoint of uniformity of the formed coating and the formation of a network of fibers within the coating. From the viewpoint of facilitating network formation, a more preferable CV value is 42% or higher, and even more preferably 45% or higher. Furthermore, from the viewpoint of improving the storage stability of the composition, it is more preferably 95% or lower, even more preferably 90% or lower, and especially preferably 85% or lower. The CV value is calculated as (standard deviation of measured fiber length) / (average fiber length) × 100 [%]. It is calculated from the measured values ​​obtained when measuring the average fiber diameter and average fiber length.

[0022] The fibers of component (a) form a strong network within the film, and from the viewpoint of uniformity of the resulting film, it is preferable that the proportion of fibers with a fiber length of 40 μm or more in the total fiber count is 5% or more. It is more preferable that the content of fibers with a fiber length of 40 μm or more is 8% or more, and even more preferable that it is 15% or more from the viewpoint of increasing fiber entanglement and improving the strength of the thin film. The upper limit for fibers with a fiber length of 40 μm or more is preferably 500 μm or less. Also, from the viewpoint of facilitating network formation, it is preferable that the content of fibers with a fiber length of 40 μm or more is 100% or less.

[0023] Among the fibers of component (a), fibers having an average fiber diameter of 0.1 μm or more and 7 μm or less, an average fiber length of 20 μm or more and 300 μm or less, a CV value of the fiber length of 40% or more and 100% or less, and a ratio of fibers with a fiber length of 40 μm or more to the total number of fibers of 5% or more are more preferred as short fibers for thin film formation. The preferred ranges for the average fiber diameter, average fiber length, CV value of the fiber length, and ratio of fibers with a fiber length of 40 μm or more in these short fibers for thin film formation are the same as the preferred ranges for the fibers of component (a).

[0024] The short fibers of the present invention can be produced by a step of short-fiberizing fibers obtained from a fiber-forming polymer by various known spinning techniques. Here, the fiber-forming polymer is usually a thermoplastic or solvent-soluble chain polymer. Preferably, it is a thermoplastic resin with a weight-average molecular weight of 1.0 × 10⁻⁶.4 From g / mol to 2.0 × 10 5 A thermoplastic resin with a g / mol content is more preferable. Among fiber-forming polymers, the use of a water-insoluble polymer is preferable in that it maintains the shape of the fibers in the thin-film forming composition. Furthermore, as a spinning method, electrospinning is preferred in that it yields fibers with a small fiber diameter. The weight-average molecular weight can be measured, for example, by using gel permeation chromatography to measure the weight-average molecular weight of a biodegradable polyester, as the weight-average molecular weight in terms of polystyrene, according to the following conditions. As a polystyrene standard sample, a molecular weight calibration curve can be prepared in advance using polystyrene samples with known and different weight-average molecular weights (for example, monodisperse polystyrene manufactured by Tosoh Corporation (model numbers: F450, F288, F128, F80, F40, F20, F10, F4, F1, A5000, A2500, A1000, A500 and A300)), and the result can be measured by comparing the calibration curve with that of the sample to be measured.

[0025] <Gel Permeation Chromatography Conditions> • Measurement device: HLC-8220GPC (Tosoh Corporation) • Column: GMHHR-H + GMHHR-H (Tosoh Corporation) • Eluent: 1 mmol Firmin DM20 (Kao Corporation) / CHCl3 • Eluent flow rate: 1.0 mL / min • Column temperature: 40°C • Detector: RI • Sample concentration: 0.1 vol% (chloroform solution) • Sample injection volume: 100 mL

[0026] Water-insoluble polymer fibers refer to materials in which, when weighed at 1 atmosphere and 23°C, 1 g of fiber is immersed in 10 g of deionized water, and after 24 hours, more than 0.5 g of the immersed polymer remains undissolved.

[0027] Examples of water-insoluble polymers include fully saponified polyvinyl alcohol that can be insolubilized after film formation, partially saponified polyvinyl alcohol that can be crosslinked after film formation when used in combination with a crosslinking agent, oxazoline-modified silicones such as poly(N-propanoylethyleneimine) graft-dimethylsiloxane / γ-aminopropylmethylsiloxane copolymer, polyvinyl acetal diethylaminoacetate, polyester resins such as zein (a major component of corn protein), polylactic acid (PLA), polybutylene succinate, polyethylene terephthalate (PET), polybutylene terephthalate, acrylic resins such as polyacrylonitrile resin and polymethacrylic acid resin, polystyrene resin, polyvinyl butyral resin, polyvinyl acetal resin, polyurethane resin, polyamide resin, polyimide resin, polyamide-imide resin, polypropylene resin, polyethylene resin, and various polypeptides (collagen, gelatin, fibrin, casein, etc.). These water-insoluble polymers can be used individually or in combination of two or more. Of these water-insoluble polymers, one or more selected from fully saponified polyvinyl alcohol that can be insolubilized after film formation, partially saponified polyvinyl alcohol that can be crosslinked after film formation when used in combination with a crosslinking agent, acrylic resins such as polymethacrylic acid resin, polyvinyl butyral resin, polyurethane resin, polylactic acid (PLA), oxazoline-modified silicones such as poly(N-propanoylethyleneimine) graft-dimethylsiloxane / γ-aminopropylmethylsiloxane copolymer, polyvinyl acetal diethylaminoacetate, and zein can be used. Of these, one or more selected from polyvinyl butyral resin, acrylic resin, polypropylene resin, polyesters such as polylactic acid, and polyurethane resin are more preferred from the viewpoint of ease of nanofiber formation. As the acrylic resin, octylacrylamide / hydroxypropyl acrylate / butylaminoethyl methacrylate copolymer is preferred. Furthermore, using biodegradable resins such as polylactic acid, polybutylene succinate, polyglycolic acid, polycaprolactone, and polyhydroxyalkanoic acid is also preferable from the standpoint of reducing environmental impact.In this specification, "biodegradable" means that the degree of biodegradation of polyester, as measured in accordance with JIS K6953-1, is 30% or higher.

[0028] Methods for shortening fibers include cutting, shearing, crushing, pulverizing, deburring, or defibrating. Examples include mechanical vortex mills, impact crushers such as hammer crushers, jet mills, media-type mills such as ball mills and rod mills, dry mills such as cutter mills and disc mills, and wet mills using media mills or medialess mills with liquid media, as well as combinations thereof. A more preferred method for shortening fibers involves manufacturing a fiber aggregate in which nanofibers are intertwined, such as a nonwoven fabric, cutting the fiber aggregate to an appropriate size, and then using a mechanical vortex mill, cutter mill, disc mill, wet high-speed shear type medialess mill, or wet high-pressure shear type medialess mill. The fiber aggregate may also include materials with a predetermined thickness, such as cotton-like material, in addition to nonwoven fabrics.

[0029] The content of component (a) in the composition of the present invention is 0.5% by mass or more and 10% by mass or less, from the viewpoint of uniformity of the formed film, adhesion, and ease of forming a fiber network. Considering the practical amount used in the composition, a preferred content is 0.7% by mass or more, and more preferably 1% by mass or more. Also considering the practical amount used in the composition, 8% by mass or less is preferred, and 6% by mass or less is more preferred. The content of component (a) in the total film-forming composition is obtained by first obtaining fibers that are recognized as water-insoluble polymer fibers according to the definition of water-insoluble polymers described above from among the fibers contained in the composition. Then, after washing the fibers with a solvent in which they are insoluble, only the water-insoluble polymer fibers are obtained by filtration. The solvent is preferably ethanol if the resin contained in component (a) is an ester-based resin such as polylactic acid, and preferably water if the resin is acrylic. The mass of the water-insoluble polymer fibers can be measured and determined, and the mass % of the fibers can be determined by the ratio to the weight of the composition before washing, i.e., (weight of component (a) after washing) / (weight of composition before washing).

[0030] The volatile component of component (b) improves the coatability of the composition of the present invention, as well as making the formed film uniform and improving adhesion. In the present invention, volatility refers to a volatile component whose vapor pressure at 20°C is 0.01 kPa or more and 106.66 kPa or less.

[0031] (b) Examples of volatile components include water, alcohol, amides, ketones, volatile silicones, and volatile hydrocarbons. From the viewpoint of ease of application, water, alcohol, and one or more selected from volatile silicones and volatile hydrocarbons are preferred.

[0032] Suitable alcohols include monohydric chain aliphatic alcohols, monohydric cyclic aliphatic alcohols, and monohydric aromatic alcohols. Examples of monohydric chain aliphatic alcohols include C1-C6 alcohols, examples of monohydric cyclic alcohols include C4-C6 cyclic alcohols, and examples of monohydric aromatic alcohols include benzyl alcohol and phenylethyl alcohol. Specific examples include ethanol, isopropyl alcohol, butyl alcohol, phenylethyl alcohol, n-propanol, and n-pentanol. One or more of these alcohols can be used. Examples of volatile silicones include dimethylpolysiloxane and cyclic silicones. Examples of volatile hydrocarbons include isododecane and hydrogenated polyisobutene.

[0033] (b) The content of volatile components is 15% by mass or more and 90% by mass or less in the composition of the present invention, from the viewpoint of the applicability of the composition and the uniformity of the film. From the viewpoint of the feel when applying the film-forming composition to the skin or substrate surface and after application, 17% by mass or more is more preferable, 20% by mass or more is even more preferable, and 30% by mass or more is particularly preferable. Furthermore, from the viewpoint of the formation of a fiber network after applying the film-forming composition to the skin or substrate surface and the durability of the film, 87% by mass or less is preferable, and 85% by mass or less is more preferable. The content of volatile components can be measured by measuring the weight loss when the sample is heated or depressurized or a combination thereof. It can also be measured by heating the sample at 200°C using an infrared moisture meter until the weight stops changing and measuring the weight loss.

[0034] In the composition of the present invention, the fibers form a network within the formed film, and in order to improve the uniformity and adhesion of the film, (average fiber diameter) 2 / fiber content (μm 2 The fiber content ( / mass%) is preferably in the range of 0.005 to 7. Fiber content refers to the mass percentage of fibers in the film-forming composition. From the viewpoint of uniformity of the fiber network, this value is preferably 0.02 or higher, more preferably 0.03 or higher, and even more preferably 0.05 or higher. Furthermore, from the viewpoint of sufficiently forming a fiber network in the film, it is preferably 6 or less, more preferably 5 or less, even more preferably 4 or less, and even more preferably 3 or less. This value, i.e., (average fiber diameter) 2 / Average fiber content (μm 2 The value per mass (%) is an indicator of the cumulative length of fibers contained in the composition; a higher value means a shorter cumulative length.

[0035] The total content of component (a) and component (b) in the composition of the present invention is 97% by mass or less from the viewpoints of the coating property of the composition, the uniformity of the film formed, and the adhesion. Considering the practical blending amount in the composition, 92% by mass or less is preferable, 90% by mass or less is more preferable, and 87% by mass or less is particularly preferable. Also, considering the practical blending amount in the composition, 16% by mass or more is preferable, 21% by mass or more is more preferable, and 31% by mass or more is further preferable.

[0036] The mass ratio (a / b) of component (a) and component (b) in the composition of the present invention is preferably 0.005 or more, more preferably 0.01 or more, from the viewpoints of the coating property of the composition, the uniformity of the film formed, and the adhesion. Considering the practical blending amount in the composition, 0.7 or less is preferable, 0.4 or less is more preferable, 0.25 or less is further preferable, and 0.2 or less is particularly preferable.

[0037] In addition to the above components (a) and (b), the composition of the present invention may contain (c) a non-volatile oil agent, (d) a surfactant, (e) a polyol that is liquid at 20°C, a preservative, various powders, a humectant other than the component (e), a water-soluble polymer, an amino acid, a pigment, and the like.

[0038] Examples of the (c) non-volatile oil agent include ester oil, hydrocarbon oil, higher alcohol, ether oil, silicone oil, fluorine oil, and the like. Among these, one or more selected from ester oil, hydrocarbon oil, ether oil, and higher alcohol are more preferable in terms of imparting high durability to the film. The content and skeletal structure of component (c) can be identified by specifying the molecular structure by known techniques such as NMR (nuclear magnetic resonance apparatus), chromatography, IR analysis, and combinations thereof. Also, the content of component (c) can be measured by, for example, the intensity of the measurement value of the portion showing the above skeletal structure by the above measurement.

[0039] As the ester oil, one or more can be selected from esters consisting of a straight-chain or branched-chain fatty acid and a straight-chain or branched-chain alcohol or polyhydric alcohol, and triglycerol 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, cholesteryl 12-hydroxystearylate, ethylene glycol di-2-ethylhexanoate, dipentaerythritol fatty acid ester, N-aluminum monoisostearate Kilglycol, neopentyl glycol dicaprate, diisostearyl malate, glyceryl di-heptylundecanoate, trimethylolpropane tri-2-ethylhexanoate, trimethylolpropane triisostearate, pentaerythritol tetra-2-ethylhexanoate, glyceryl tri-2-ethylhexanoate, trimethylolpropane triisostearate, cetyl 2-ethylhexanoate, 2-ethylhexyl palmitate, diethylhexyl naphthalenedicarboxylate, alkyl benzoate (C12-C15) Ingredients: Cetearyl isononanoate, Caprylic / Capric Triglyceride, Dicaprylic / Capric Butylene Glycol, Glyceryl Trilaurate, Glyceryl Trimyristate, Glyceryl Tripalmitate, Glyceryl Triisostearate, Glyceryl Tri-2-Heptyl Undecanoate, Glyceryl Tribehenate, Glyceryl Coconut Oil Fatty Acid, Methyl Castor Oil Fatty Acid, Oleyl Oleate, 2-Heptyl Undecyl Palmitate, Diisobutyl Adipate, N-Lauroyl-L-Glutamate One or more of the following can be used: 2-octyldodecyl ester, di-2-heptylundecyl adipate, ethyl laurate, di-2-ethylhexyl sebacate, 2-hexyldecyl myristate, 2-hexyldecyl palmitate, 2-hexyldecyl adipate, diisopropyl sebacate, di-2-ethylhexyl succinate, triethyl citrate, 2-ethylhexyl paramethoxycinnamate, tripylene glycol dipivalate, polyglyceryl diisostearate, and glyceryl behenate.

[0040] Among these, from the viewpoints of the adhesion and durability of the formed film, at least one selected from octyldodecyl myristate, myristyl myristate, isocetyl stearate, isocetyl isostearate, cetearyl isononanoate, diisobutyl adipate, di(2-ethylhexyl) sebacate, isopropyl myristate, isopropyl palmitate, distearyl malate, neopentyl glycol dicaprate, C12-15 alkyl benzoate, and glyceryl tri(caprylate / caprate) is preferable, and at least one selected from isopropyl myristate, isopropyl palmitate, distearyl malate, neopentyl glycol dicaprate, C12-15 alkyl benzoate, and glyceryl tri(caprylate / caprate) is more preferable. It is still more preferable to contain one or more selected from neopentyl glycol dicaprate, C12-15 alkyl benzoate, glyceryl tri(caprylate / caprate), isopropyl myristate, polyglyceryl diisostearate, and glyceryl behenate. The oil agent in the present invention has an HLB value of 10 or less, preferably 8 or less. The HLB value is an index indicating the hydrophilic-lipophilic balance (Hydrophile ipophile Balance), and in the present invention, the value calculated by the following formula by Oda and Teramura et al. is used. HLB = (Σinorganic value / Σorganic value) × 10

[0041] Examples of the hydrocarbon oil include hydrocarbon oils that are liquid at 20°C, such as liquid paraffin, squalane, squalene, n-octane, n-heptane, cyclohexane, light isoparaffin, and fluid isoparaffin, and hydrocarbon oils that are solid or semi-solid at 20°C, such as petrolatum, ceresin, paraffin wax, microcrystalline wax, ozokerite, hydrogenated polyisobutene, polyethylene wax, and polyolefin wax. From the viewpoint of the durability of the formed film, one or more selected from liquid paraffin, fluid isoparaffin, squalane, and petrolatum are preferable.

[0042] Examples of ether oils include alkyl-1,3-dimethylbutyl ethers such as cetyldimethylbutyl ether, ethylene glycol dioctyl ether, glycerol monooleyl ether, and dicaprylyl ether. One or more of these can be used.

[0043] Examples of higher alcohols include those having 12 to 20 carbon atoms, specifically cetyl alcohol, stearyl alcohol, isostearyl alcohol, oleyl alcohol, etc., and one or more selected from these can be used. Cetyl alcohol is preferred as the higher alcohol.

[0044] In addition, animal and vegetable oils containing the above-mentioned ester oils and hydrocarbon oils can be used. Examples of animal and vegetable oils include olive oil, jojoba oil, macadamia nut oil, meadowfoam oil, castor oil, safflower oil, sunflower oil, avocado oil, canola oil, apricot kernel oil, rice germ oil, and rice bran oil. Olive oil is preferred as the animal or vegetable oil.

[0045] Examples of silicone oils include dimethylpolysiloxane, 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. Dimethylpolysiloxane is preferred as the silicone oil. Examples of fluorine oils include perfluorodecalin, perfluoroadamantane, perfluorobutyltetrahydrofuran, perfluorooctane, perfluorononane, perfluoropentane, perfluorodecane, perfluorododecane, and perfluoropolyether.

[0046] The content of component (c) in the composition of the present invention is preferably 2% by mass or more, more preferably 5% by mass or more, and even more preferably 8% by mass or more, from the viewpoint of the dispersibility of component (a), the adhesion of the formed film, and the durability. Furthermore, from the viewpoint of the dispersibility of component (a), the adhesion of the formed film, and the durability, it is preferably 80% by mass or less, more preferably 75% by mass or less, and even more preferably 65% ​​by mass or less.

[0047] From the viewpoint of adhesion of the formed film, the content of the oil selected from silicone oil and fluorine oil is preferably 80% by mass or less (0 to 80% by mass), more preferably 75% by mass or less (0 to 75% by mass), and even more preferably 70% by mass or less (0 to 70% by mass).

[0048] (d) Examples of surfactants include nonionic surfactants, anionic surfactants, cationic surfactants, etc., such as polyoxyethylene methylpolysiloxane copolymer, poly(oxyethylene oxypropylene) methylpolysiloxane copolymer, crosslinked polyether-modified silicone, crosslinked alkyl polyether-modified silicone, cetyl dimethicone copolyol, propylene glycol monostearate, sorbitan monooleate, glyceryl stearate, polyoxyethylene hydrogenated castor oil, polyoxyethylene alkyl ether, sorbitan sesquioleate, and diglyceryl monooleate. These surfactants may be used individually or in combination of two or more. Nonionic surfactants are preferably those with an HLB value greater than 10, and more preferably 12 or higher. Nonionic surfactants and anionic surfactants are preferred. Polyoxyethylene sorbitan monostearate (20 E.O.) and polyoxyethylene sorbitan tristearate (20 E.O.) are preferred nonionic surfactants. N-stearoyl-L-glutamic acid is preferred as the anionic surfactant.

[0049] (e) Examples of polyols that are liquid at 20°C include alkylene glycols such as ethylene glycol, propylene glycol, 1,3-propanediol, and 1,3-butanediol; polyalkylene glycols such as diethylene glycol, dipropylene glycol, polyethylene glycol and polypropylene glycol with a weight-average molecular weight of 2000 g / mol or less; and glycerin derivatives such as glycerin, diglycerin, and triglycerin. Of these, ethylene glycol, propylene glycol, 1,3-butanediol, dipropylene glycol, polyethylene glycol with a weight-average molecular weight of 2000 g / mol or less, glycerin and diglycerin are preferred, propylene glycol, 1,3-butanediol and glycerin are more preferred, and propylene glycol and 1,3-butanediol are even more preferred.

[0050] Examples of preservatives include phenoxyethanol, methyl parahydroxybenzoate, ethyl paraaminobenzoate, isobutyl parahydroxybenzoate, isopropyl parahydroxybenzoate, ethyl parahydroxybenzoate, butyl parahydroxybenzoate, propyl parahydroxybenzoate, benzyl parahydroxybenzoate, and ethylhexanediol.

[0051] The composition of the present invention can be produced by conventional methods, by heating and mixing the above-mentioned components as necessary.

[0052] The viscosity of the composition of the present invention at 20°C is preferably 5 mPa·s or more, more preferably 10 mPa·s or more, and even more preferably 10,000 mPa·s or more, from the viewpoint of ease of spreading. Considering a practical blending amount, the viscosity at 20°C is preferably 50,000 mPa·s or less, more preferably 30,000 mPa·s or less, and even more preferably 20,000 mPa·s or less. The viscosity of the composition of the present invention can be measured at 20°C using a B-type viscometer (VISCOMETER TV-10, Toki Sangyo Co., Ltd.), and the rotor and rotation speed shall conform to the standards set by the measuring instrument.

[0053] The composition of the present invention is a film-forming composition, and by applying it to the skin or other substrates, a uniform film can be formed on the skin or the substrate surface. Further, this film forms a fiber network due to the disappearance of volatile components by volatilization. As a result, the obtained film is excellent in uniformity and adhesion.

[0054] If the composition of the present invention is applied to the skin, a film excellent in uniformity can be formed on the skin surface. As means for applying the composition to the skin, examples include application by fingers, application by spray, application using tools such as rollers and sponges, and application of stick-shaped solid cosmetics. As the range that can be applied by hand, the viscosity at 20 ° C. is preferably within the above range. According to the present invention, the film formed on the skin surface has good uniformity, excellent adhesion and durability, and preferably also has good transparency. Here, the thickness of the film depends on the coating amount, but in the normal use range (coating area weight 1 to 3 mg / cm 2 ), it is preferably 0.3 μm or more and 30 μm or less, and more preferably 0.5 μm or more and 20 μm or less. The thickness is measured with a contact-type film thickness meter (Mitutoyo Corporation's Lite-Matic VL-50A) on the substrate after coating on the substrate. Here, a PET substrate is used.

[0055] Next, the present invention will be described in more detail with reference to examples.

[0056] [Example of production of component (a)] Example 1 shows an example of short fiber production. (1) The acrylic resin shown in Table 1, specifically the (octylacrylamide / hydroxypropyl acrylate / butylaminoethyl methacrylate) copolymer, was dissolved in ethanol to obtain an 18% by mass solution. Using this solution, a nanofiber sheet was formed on the surface of the collector using the electrospinning apparatus shown in Figure 1. The production conditions for the nanofibers were as follows: - Applied voltage: 30 kV - Distance between capillary and collector: 150 mm - Aqueous solution discharge rate: 12 mL / hour - Environment: 25°C, 30% RH (2) After cutting the obtained nanofiber sheet to an appropriate size, a disperser blade was attached to a stirring system (Primix Corporation, Labolution® registered trademark), and the sheet was sheared at a rotation speed of 8000 rpm for 15 minutes to obtain fibers.

[0057] Examples 2-4, 7-11, and 13 were manufactured in the same manner as Example 1, except for polymer concentration, rotation speed, and shearing time, as shown in Table 1. Example 5 is shown as an example of short fiber production. The ester resin (PLA) shown in Table 1 was dissolved in chloroform and dimethylformamide (80:20 weight ratio) to obtain a 20% by mass solution. Using these solutions, a nanofiber sheet was formed on the surface of the collector using the electrospinning apparatus shown in Figure 1. 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 (2). The obtained nanofiber sheet was sheared in a circulation line at 13500 rpm for 8 cycles using a dispersion device (Milder, manufactured by Taiheiyo Kiko Co., Ltd.) to obtain fibers. Examples 6 and 12 were manufactured in the same manner as Example 4, except for polymer concentration and number of cycles, as shown in Table 1.

[0058] [Example of composition preparation] The obtained component (a) was added and blended as shown in Table 1 to make the composition. The properties of the obtained fibers are shown in Table 1.

[0059]

[0060] *1: AMPHOMER 28-4910 (AkzoNobel Co., Ltd.) *2: Polylactic Acid Ingeo6252D (Natureworks) *3: Clopure OL-LQ (Croda Japan Co., Ltd.) *4: Estemol N-01 (Nisshin Oillio Group, Ltd.) *5: Cosmall 42V (Nisshin Oillio Group, Ltd.) *6: Sunsoft No.8100-C (Taiyo Kagaku Co., Ltd.) *7: Silicone KF-96A-10CS (Shin-Etsu Chemical Co., Ltd.) *8: Silicone KF-96A-50CS (Shin-Etsu Chemical Co., Ltd.) *9: Silicone KSG-16 (Shin-Etsu Chemical Co., Ltd.) *10: PEG-1540(-G) (NOF Co., Ltd.) *11: Leodor TW-S120V (Kao Corporation) *12: Leodor TW-S320V (Kao Corporation) *13: Amisoft HA-P (Ajinomoto Co., Inc.) *14: SIMULGEL EG (SEPPIC) *15: PEMULEN TR-1 (Lubrizol Advanced Materials) *16: Shiro Naiver 0.5-6D (Cosmeterias Co., Ltd.) Of these, *2 is biodegradable.

[0061] Examples 1-9 The film-forming compositions shown in Table 1 were prepared, and the compositions were uniformly applied to artificial leather to form a film. The properties of the formed film were evaluated. (Evaluation method) (1) Adhesion 2 mg / cm of the film-forming composition was applied to the artificial leather. 2 The transferability was evaluated after application and 15 minutes of drying. Transferability was evaluated visually by pressing black paper against the fibers according to the following criteria: 4: No transfer. 3: Little transfer, but some transfer (less than 40%) was observed. 2: 40% to less than 70% transfer. 1: 70% or more transfer.

[0062] (2) Uniformity: 2 mg / cm² of film-forming composition on artificial leather 2 The coating was applied by finger (10-20 gf), and the uniformity of the coating film was visually inspected and evaluated according to the following criteria: 4: No uneven coating. 3: Uneven coating is visible in less than 30% of the total coating area. 2: Uneven coating is visible in 30% to less than 70% of the total coating area. 1: Uneven coating is present in 70% or more of the total coating area.

[0063] (3) Applicability Ten men and women in their 20s and 30s were given 2 mg / cm of the film-forming composition. 2 The sample was applied to the arm, and the ease of spreading it was evaluated. The average value was calculated and rounded to the first decimal place. When spreading, the film-forming composition was taken in the dominant hand and applied to the other arm, spreading it until the film-forming substance became transparent. A 5cm x 5cm area was marked for application, 50mg was taken in the hand, and spread evenly. When applying, areas without wounds and with little arm hair were selected. The evaluation criteria were as follows: 4: Very easy to spread. 3: Easy to spread. 2: Difficult to spread (tends to curl). 1: Difficult to spread.

[0064] (4) Network formation The presence or absence of network formation was evaluated using SEM. Network formation was evaluated when a fiber had two or more intersection points with other fibers and the presence of gaps surrounded by fibers could be confirmed throughout, and this was indicated as "○" in the table.

[0065] The results are shown in Table 1. Furthermore, Figure 2 shows a reference image of an SEM with network formation, which was used as a criterion for determining the presence or absence of network formation in the examples and comparative examples, while Figure 3 shows an image of an SEM without network formation.

[0066] Examples 10-13 and Comparative Examples 1 and 2: The film-forming compositions shown in Table 2 were prepared, and these compositions were uniformly applied to artificial leather to form a film. The properties of the formed film were evaluated. The evaluation method was the same as in Examples 1-9.

[0067]

[0068] [Examples of Short Fiber Production] Example 14 is shown as an example of short fiber production. (1) The acrylic resin shown in Table 3, specifically the (octylacrylamide / hydroxypropyl acrylate / butylaminoethyl methacrylate) copolymer, was dissolved in ethanol to obtain an 18% by mass solution. Using this solution, a nanofiber sheet was formed on the surface of the collector using the electrospinning apparatus shown in Figure 1. The nanofiber production conditions were as follows: ・Applied voltage: 30kV ・Capillary-collector distance: 150mm ・Aqueous solution discharge rate: 12mL / hour ・Environment: 25℃, 30%RH (2) The obtained nanofiber sheet was attached to a stirring system (Primix Corporation, Labolution® registered trademark) with a disperser blade and sheared at a rotation speed of 5000rpm for 25 minutes to obtain fibers. Examples 15, 16, 18-21 were produced in the same manner as in Example 14, except for the polymer concentration, rotation speed, and shearing time, as shown in Table 3. Example 17 is also shown as an example of short fiber production. (1) The ester resin (PLA) shown in Table 3 was dissolved in chloroform and dimethylformamide (80:20 weight ratio) to obtain a 20% solution. Using this solution, a nanofiber sheet was formed on the surface of the collector using the electrospinning apparatus shown in Figure 1. The conditions for producing the nanofibers were as follows: Applied voltage: 30 kV, Capillary-collector distance: 150 mm, Aqueous solution discharge rate: 12 mL / H, Environment: 25°C, 30% RH (2) The obtained nanofiber sheet was sheared in a circulation line at 13500 rpm for 8 cycles using a dispersion apparatus (Milder, manufactured by Taiheiyo Kiko Co., Ltd.) to obtain fibers. In Examples 22 and 23, fibers were produced in the same manner as in Example 17, except for the polymer concentration and number of cycles, as shown in Table 3.

[0069] [Example of Composition Preparation] The obtained short fibers were blended according to the formulation in Table 4 to prepare a thin film-forming composition. The properties and formulations of the obtained fibers are shown in Tables 3 and 4.

[0070]

[0071]

[0072] *19: Leodor TW-S120V (Kao Corporation) *20: SIMULGEL EG (SEPPIC) *21: Estemall N-01 (Nisshin Oillio Group Ltd.) *22: Leodor TW-S320V (Kao Corporation) *23: PEMULEN TR-1 (Lubrizol Advanced Materials)

[0073] Examples 14-23: Thin film-forming compositions from Table 4 were prepared, and these compositions were uniformly applied to artificial leather to form thin films. The properties of the formed thin films were evaluated. (Evaluation method) (1) Adhesion: Thin film-forming compositions of formulations A, B, and C were applied at a rate of 2 mg / cm² to two types of substrates: artificial leather and PET film. 2 The adhesion of the artificial leather and PET film, which were applied by finger to form a thin film, was evaluated by bending tests. With the thin film facing inward, the film was bent 180 degrees 10 times, and the adhesion state between the thin film and the substrate was judged according to the following criteria: 4: No change. 3: Peeling or twisting of the thin film was observed after the 7th time. 2: Peeling or twisting of the thin film was observed after the 3rd time. 1: Peeling or twisting of the thin film was observed after the 1st time.

[0074] (2) Network Formation The presence or absence of network formation was evaluated using SEM. Network formation was evaluated when a fiber had two or more intersection points with other fibers and the presence of gaps surrounded by fibers could be confirmed throughout, and this was indicated with "○" in the table. SEM reference images with network formation are shown in Figure 4, and SEM reference images without network formation are shown in Figure 5.

[0075] 10 Electrostatic spray device 11 Syringe 12 High voltage source 13 Conductive collector 11a Cylinder 11b Piston 11c Capillary

Claims

DEPCT651. A film-forming composition which includes the following components (a) and (b): (a) fibers of 0.5 percent by mass or more and 10 percent by mass or less relative to the total film-forming composition, which have an average fiber diameter of 0.1 micrometers or more and 7 micrometers or less, and a characteristic ratio [(average fiber length) / (average fiber diameter)] of 8 or more and 300 or less; and (b) volatile components of 15 percent by mass or more and 90 percent by mass or less relative to the total film-forming composition, which have a [(average fiber diameter)2 / (fiber volume)](sq.µm / percent by mass) of 0.005 or more and 7 or less, and the total combined amount of component (a) and component (b) is 97 percent by mass or less.

2. A film-forming composition according to claim 1 in which component (a) contains an insoluble polymer.3.The composition for forming a coating film under claim 1 or 2, where component (a) is composed of one or more substances selected from the group of fully saponified polyvinyl alcohols that are insoluble after film formation, partially saponified polyvinyl alcohols that are crosslinkable after film formation when used with a crosslinking agent, acrylic resins such as polymethacrylic acid resins, polyvinyl butyral resins, polyurethane resins, polylactic acid, oxazoline modified silicones such as poly(N- copolymers) Propanoyl ethyleneimine) grafted with dimethylsiloxane / gamma-aminopropylmethylsiloxane, polyvinyl acetal diethyl amino acetate and the desired compound is composed of one or more compounds selected from the group of polyvinyl butyral resins, acrylic resins, polypropylene resins, polyurethane resins, polylactic acid, polybutylene succinate, polyglycolic acid, polycaprolactone and polyhydroxyalkanoic acid.

4. A compound for forming a coating film according to any of the claims of claims 1 to 3 where the compound (a) is polylactic acid. 5.The composition for forming a coating film under any of the claims of Reputations 1 through 4 where the amount of component (a) is 0.5 percent by mass or more and 10 percent by mass or less is desirable, 0.7 percent by mass or more and 8 percent by mass or less is desirable, 1 percent by mass or more and 6 percent by mass or less is desirable.

6. The composition for forming a coating film under any of the claims of Reputations 1 through 5 where the average fiber diameter of component (a) is 0.2 micrometers or more and 5 micrometers or less is desirable, 0.3 micrometers or more and 4 micrometers or less is desirable, 0.3 micrometers or more and 3 micrometers or less is desirable. 7.A film-forming component under any of the claims 1 through 6 where the average fiber length of component (a) is 20 µm or more and 300 µm or less is desirable, 25 µm or more and 250 µm or less is even more desirable, 30 µm or more and 200 µm or less is even more desirable, 40 µm or more and 200 µm or less.

8. A film-forming component under any of the claims 1 through 7 where the characteristic ratio [(average fiber length) / (average fiber diameter)] of component (a) is 8 or more and 300 or less is desirable, 10 or more and 300 or less is even more desirable, 15 or more and 250 or less is even more desirable, 20 or more and 250 or less is even more desirable, 20 or more and 200 or less. 9.

10. A film-forming component under any of the claims 1 through 8 where the CVV of the fiber length of component (a) is 40 percent or more and 100 percent or less is desirable, 42 percent or more and 95 percent or less is desirable, 45 percent or more and 90 percent or less is desirable.

11. A film-forming component under any of the claims 1 through 9 where [(average fiber diameter)2 / (fiber volume)](sq.µm / percent by mass) in this component is 0.02 or more and 7 or less is desirable, 0.02 or more and 6 or less is desirable, 0.03 or more and 5 or less is desirable, 0.05 or more and 4 or less is desirable. 12.

12. A film-forming composition under any of the claims of claims 1 through 11 in which component (b) consists of one or more substances selected from the group of water, alcohol, amide, volatile silicone and volatile hydrocarbons, and the desired substance is one or more substances selected from water, alcohol, volatile silicone and volatile hydrocarbons.

13. A film-forming composition under any of the claims of claims 1 through 11 in which component (b) consists of one or more substances selected from the group of water, ethanol, silicone and isododecane.

14.

14.

15.

16. 17 ...The components for forming a coating film under any of the claims of Claims 1 through 14 where the total desirable amount of component (a) and component (b) is 16 percent by mass or more and 97 percent by mass or less, and even more desirable is 21 percent by mass or more and 90 percent by mass or less, and even more desirable is 31 percent by mass or more and 90 percent by mass or less.

16. The components for forming a coating film under any of the claims of Claims 1 through 14 17. Film-forming compositions under any one of Reservations 1 through 16 where the mass ratio of component (a) to component (b) (a / b) is 0.005 or more and 0.7 or less, the desirable ratio is 0.005 or more and 0.4 or less, the more desirable ratio is 0.001 or more and 0.25 or less, the most desirable ratio is 0.

18. A film-forming compound pursuant to any of the claims 1 through 17 in which the mass ratio of component (a) to component (b) (a / b) is 0.01 or more and 0.25 or less.

19. A film-forming compound pursuant to any of the claims 1 through 18 which is further incorporated with one or more substances selected from the group consisting of (c) non-volatile oils and (e) polyols.

20. A film-forming compound pursuant to claim 19 in which (c) non-volatile oils are incorporated with one or more non-volatile oils selected from the group consisting of ester oils, hydrocarbon oils, long-chain alcohols, ether oils, silicone oils and fluorine oils. 21.

21. A film-forming compound under Reputation 19 or 20 in which the amount of (c) non-volatile oil substance is 2 percent by mass or more and 80 percent by mass or less is desirable, 5 percent by mass or more and 75 percent by mass or less is more desirable, 8 percent by mass or more and 65 percent by mass or less.

22. A film-forming compound under any one of Reputation 1 through 21 in which the viscosity at 20 degrees Celsius is 5 millipascals•seconds or more and 50,000 millipascals•seconds or less.

23. A film-forming compound under any one of Reputation 1 through 22 in which the viscosity at 20 degrees Celsius is 10 millipascals•seconds or more and 30,000 millipascals•seconds or less.

24. A method for producing a film on the surface of the skin which involves the application of any one of the film-forming compounds under Reputation 1 through 23 to the skin. 25.

25. Short fibers for thin film fabrication in which the average diameter of these short fibers is 0.1 µm or more and 7 µm or less; the average length of these short fibers is 20 µm or more and 300 µm or less; the CVV of this length is 40 percent or more and 100 percent or less; and the proportion of fibers with a length of 40 µm or more in the total short fibers is 5 percent or more and 100 percent or less.

26. Short fibers for thin film fabrication according to claim 25 in which the proportion of fibers with a length of 40 µm or more in the total short fibers is 8 percent or more and 100 percent or less, the desirable proportion is 15 percent or more and 100 percent or less.

27. Short fibers according to claim 25 or 26 which consist of an insoluble polymer.

28. Short fibers according to any one of claims 25 through 27 which exhibit biodegradability. 29.

30. Short fibers as defined by any one of the claims in claims 25 through 28, which are composed of thermoplastic resins with an average molecular weight of 1.0 x 10⁴ g / mol or more and 2.0 x 10⁵ g / mol or less.

31. Short fibers as defined by any one of the claims in claims 25 through 29, where the characteristic ratio of this short fiber [(average fiber length) / (average fiber diameter)] is 8 or more and 300 or less.

32. Short fibers as defined by any one of the claims in claims 25 through 30, where the ratio of this short fiber [(average fiber length) / (average fiber diameter)] is 8 or more and 300 or less. The characteristics of this short fiber [(average fiber length) / (average fiber diameter)] are 10 or more and 300 or less, the desirable is 15 or more and 250 or less, the more desirable is 20 or more and 250 or less, the more desirable is 25 or more and 200 or less.

32. Short fibers according to any one of the claims 25 through 31 where the average diameter of this short fiber is 0.2 micrometers or more and 5 micrometers or less. 33.

33. Short fibers pursuant to any one of the claims 25 through 32 where the average diameter of this short fiber is 0.3 micrometers or more and 4 micrometers or less, the desirable is 0.3 micrometers or more and 3 micrometers or less.

34. Short fibers pursuant to any one of the claims 25 through 33 where the average length of this short fiber is 25 micrometers or more and 250 micrometers or less.

35. Short fibers pursuant to any one of the claims 25 through 34 where the average length of this short fiber is 30 micrometers or more and 200 micrometers or less, the desirable is 40 micrometers or more and 200 micrometers or less, the more desirable is 40 micrometers or more and 150 micrometers or less.

36. Short fibers pursuant to any one of the claims 25 through 35 where the CVV of this short fiber length is 42 percent or more and 95 percent or less. 37.

37. A method for producing short fibers under any of the claims 25 through 36 where the CVV of this short fiber length is 45 percent or more and 90 percent or less, with the desired being 45 percent or more and 85 percent or less.

38. A method for producing short fibers under any of the claims 25 through 37 which includes shortening of nanofibers produced by electrospinning.

39. A coating film incorporating short fibers under any of the claims 25 through 38.

40. A coating film under claim 39 which has a thickness of 0.3 micrometers or more and 30 micrometers or less, with the desired being 0.5 micrometers or more and 20 micrometers or less.