WO2016013290A1 - 顔面保護シールド用透明フィルム - Google Patents
顔面保護シールド用透明フィルム Download PDFInfo
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- WO2016013290A1 WO2016013290A1 PCT/JP2015/065283 JP2015065283W WO2016013290A1 WO 2016013290 A1 WO2016013290 A1 WO 2016013290A1 JP 2015065283 W JP2015065283 W JP 2015065283W WO 2016013290 A1 WO2016013290 A1 WO 2016013290A1
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Images
Classifications
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- A61F9/00—Methods or devices for treatment of the eyes; Devices for putting-in contact lenses; Devices to correct squinting; Apparatus to guide the blind; Protective devices for the eyes, carried on the body or in the hand
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F9/00—Methods or devices for treatment of the eyes; Devices for putting-in contact lenses; Devices to correct squinting; Apparatus to guide the blind; Protective devices for the eyes, carried on the body or in the hand
- A61F9/04—Eye-masks ; Devices to be worn on the face, not intended for looking through; Eye-pads for sunbathing
- A61F9/045—Eye-shades or visors; Shields beside, between or below the eyes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
- B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
- B32B3/30—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by a layer formed with recesses or projections, e.g. hollows, grooves, protuberances, ribs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/02—Physical, chemical or physicochemical properties
- B32B7/023—Optical properties
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
- G02B1/11—Anti-reflection coatings
- G02B1/111—Anti-reflection coatings using layers comprising organic materials
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
- G02B1/11—Anti-reflection coatings
- G02B1/118—Anti-reflection coatings having sub-optical wavelength surface structures designed to provide an enhanced transmittance, e.g. moth-eye structures
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
- G02B1/18—Coatings for keeping optical surfaces clean, e.g. hydrophobic or photo-catalytic films
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/0006—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 with means to keep optical surfaces clean, e.g. by preventing or removing dirt, stains, contamination, condensation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/40—Properties of the layers or laminate having particular optical properties
- B32B2307/412—Transparent
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/40—Properties of the layers or laminate having particular optical properties
- B32B2307/418—Refractive
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2551/00—Optical elements
Definitions
- This technology relates to a transparent film used for a face protection shield that protects the wearer's face from flying objects and flying objects while ensuring the necessary field of view for the wearer.
- Patent Document 1 discloses a face shield mask having a structure in which a transparent plastic film is attached to a face mask as an eye shield.
- the refractive index of a flexible transparent plastic film is generally 1.3 or more
- the plastic film forming the eye shield described in Patent Document 1 is formed of polyethylene terephthalate having a refractive index of 1.58. Therefore, the reflectance of light at the interface between the eye shield and air is, for example, 5.05%, and taking into account the reflection on the front and back of the eye shield, 10.1% of the incident light in total is reflected light. It becomes. For this reason, the intensity of reflected light also increases in a surgical operating room where illumination with very high light intensity (for example, illuminance of 140,000 lux or more) is used.
- Patent Document 2 it is preferable to coat the surface of a surgical face shield used under surgical illumination with high light intensity, and the antireflection property is applied to the surface of a transparent or translucent substrate. And coating compositions capable of imparting antifogging properties are disclosed. Patent Document 2 discloses that the light transmittance of a film coated with the coating composition disclosed in the same document is increased by 11 to 11.2% with respect to the light transmittance of an uncoated film. ing.
- the light transmittance of the film coated with the coating composition disclosed in Patent Document 2 with respect to light having a wavelength of 550 nm is about 97.0%, and reflected light of still 3% was still generated.
- the film coated with the coating composition disclosed in Patent Document 2 has insufficient antireflection properties.
- the antireflection properties of the transparent film used for the face protection shield are remarkably improved, it becomes difficult to visually recognize the presence of the transparent film. Will fall. Further, when the wearer wears the face protection shield, it is difficult for the non-wearer to visually confirm whether or not the face protection shield is worn. In addition, when a non-wearing person wipes sweat on the face of a wearer wearing a face protection shield in a surgical operation, it is difficult to see the presence or absence of the face protection shield from the non-wearing person, making it difficult to perform the work of wiping sweat. It was.
- the present invention has been made in view of the above problems, and the object of the present invention is to improve the transparency and improve the visibility from non-wearers, which is new and improved. Another object of the present invention is to provide a transparent film for a face protection shield.
- a plurality of transparent substrates having flexibility and laminated at least on one surface of the transparent substrate and provided at a pitch of not more than a visible light wavelength are provided.
- the difference in refractive index with respect to light with a wavelength of 589 nm between the transparent substrate and the transparent resin layer may be 0.05 or more.
- the uneven shape may have a height difference in the range of 0.1 to 9.5 ⁇ m and a pitch in the range of 1 to 100 mm.
- the transparent resin layer may be laminated on both surfaces of the transparent substrate.
- the transparent resin layer may be a cured product of an ultraviolet curable resin composition having a hydrophilic functional group.
- a face protection shield to which the above-described transparent film for face protection shield is attached.
- the face protection shield to which the present invention is applied can ensure a remarkably bright field of view for the wearer, and can easily confirm whether or not the wearer is wearing.
- FIG. 6 is a graph showing a simulation result of L * when the thickness of a base layer formed on a flat transparent substrate is changed in the range of 0 to 10 ⁇ m.
- FIG. 6 is a graph showing the simulation results of a * when the thickness of the base layer formed on the flat transparent substrate is changed in the range of 0 to 10 ⁇ m.
- FIG. 6 is a graph showing a simulation result of b * when the thickness of a base layer formed on a flat transparent substrate is changed in a range of 0 to 10 ⁇ m.
- “transparent” means that, for example, in the visible light band (specifically, 360 nm to 830 nm), about 70% or more of incident light is transmitted, and the absorption of light is about about that of incident light. It represents less than 30%.
- FIG. 1 is a cross-sectional view schematically showing a cross-section of a transparent film 1A for face protection shield according to an embodiment of the present invention cut in the thickness direction
- FIG. 2 shows the transparent film 1A for face protection shield as a film. It is the typical top view seen from the direction perpendicular
- a transparent film 1A includes a structure (so-called moth eye) composed of a transparent substrate 10 having flexibility and a plurality of concave or convex portions provided at a pitch of not more than a visible light wavelength. And a transparent resin layer 20 having a structure).
- the face protection shield may be formed by directing either the surface of the transparent film 1A including the transparent base material 10 or the surface including the transparent resin layer 20 toward the wearer.
- the refractive index of the transparent base material 10 and the transparent resin layer 20 are different, and the interface between the transparent base material 10 and the transparent resin layer 20 has an uneven shape (the transparent base material 10 and the transparent resin layer).
- the interface with 20 is also said to have undulations).
- the interface shape of the transparent base material 10 and the transparent resin layer 20 can be observed in the cut surface at the time of cut
- the transparent film 1 ⁇ / b> A according to the present embodiment reflects the surface of the transparent resin layer 20 by forming a structure (so-called moth-eye structure) composed of a plurality of recesses or projections provided at a pitch equal to or less than the visible light wavelength. The prevention property is improved.
- the transparent film 1A according to the present embodiment makes the refractive index of the transparent substrate 10 different from the refractive index of the transparent resin layer 20, and has an uneven shape at the interface between the transparent substrate 10 and the transparent resin layer 20. By providing, a rainbow-colored reflection pattern that can be observed only by a non-wearer is formed on the transparent film 1A. With these configurations, the face protective shield transparent film 1 ⁇ / b> A according to the present embodiment can improve the visibility from a non-wearer while further improving the transparency.
- the transparent resin layer 20 supports a plurality of structures 21 (moth eye structures) composed of recesses or protrusions two-dimensionally arranged at a pitch equal to or less than the wavelength of visible light, and the individual structures 21.
- a base layer 22 formed integrally with the body 21. With such a moth-eye structure, the transparent resin layer 20 can have antireflection characteristics.
- the plurality of structures 21 constituting the moth-eye structure are structures that are convex or concave with respect to the film surface of the transparent film 1A.
- the three-dimensional shape of the structure 21 may be any shape, but may be, for example, a bell shape or an elliptical truncated cone shape.
- the planar shape of the structure 21 as viewed from the direction perpendicular to the film surface may be any shape, and may be, for example, a circle or an ellipse.
- the height H1 of the structure 21 is preferably 180 nm to 300 nm, more preferably 190 nm to 300 nm, and still more preferably 190 nm to 230 nm.
- the height of the structure 21 is a value in such a range, the antireflection characteristic of the transparent film 1A can be further improved.
- the moth-eye structure of the transparent resin layer 20 is formed by a transfer method as will be described later, the releasability when the transparent resin layer 20 is released from the original mold after the transfer can be improved. Note that the heights of the structures 21 may be different from each other.
- the tracks T1, T2, and T3 in which the structures 21 are arranged in the X direction are alternately arranged in the Y direction.
- P1 is the pitch of the structures 21 in the tracks in the X direction (hereinafter also referred to as dot pitch)
- P2 is the pitch of the structures 21 between adjacent tracks
- TP is the pitch of each track ( Hereinafter, this is referred to as a track pitch).
- UC is a unit cell in the arrangement pattern shown in FIG.
- the dot pitch P1 within the track of the structure 21 and the pitch P2 between the tracks are set to be equal to or less than the wavelength of visible light intended to prevent reflection, respectively.
- P1 and P2 may be 100 nm to 830 nm.
- the positions of the structures 21 are shifted by 1 ⁇ 2 of the dot pitch P1 for each track between adjacent tracks T1, T2, and T3.
- the structures 21 are arranged in a hexagonal lattice pattern.
- the arrangement pattern of the structures 21 is not limited to the hexagonal lattice shape shown in FIG.
- the arrangement pattern of the structures 21 may be any two-dimensional pattern, but may be, for example, a tetragonal lattice pattern or a random pattern.
- the filling rate (average filling rate) of the structures 21 in a plan view of the transparent resin layer 20 is preferably 40% or more, more preferably 65% or more, and further preferably 73% or more, with 100% being the upper limit. 86% or more is most preferable.
- the filling rate of the structures 21 can be obtained as follows.
- the surface of the transparent resin layer 20 is photographed from a direction perpendicular to the film surface of the transparent film 1 ⁇ / b> A using a scanning electron microscope (SEM: Scanning Electron Microscope).
- SEM Scanning Electron Microscope
- the unit lattice UC of the arrangement pattern is randomly selected from the photographed SEM photograph, and the dot pitch P1 and the track pitch TP of the structure 21 are measured in order to calculate the length of each side of the unit lattice UC.
- an area S UNIT of the unit cell is calculated from the measured dot pitch P1 and track pitch TP.
- S UNIT can be calculated at P1 ⁇ 2TP. Further, the area SDOT of the bottom surface of the structure 21 located at the center of the unit cell UC is measured by image processing. From these measurement results, the filling rate can be obtained from the following equation.
- the calculation of the filling rate described above is performed on a plurality of unit lattices (for example, 10 locations) randomly selected from the photographed SEM photograph, and the average of the calculated filling rates is calculated.
- the filling rate can be determined.
- the lower portions of the adjacent structures 21 are joined together, or the shape of the bottom surface of the structures 21 is adjusted to adjust the shape of the bottom surface of the transparent resin layer 20 in a plan view. For example, the area of the portion can be reduced.
- the base layer 22 is formed integrally with the structure 21 and supports the individual structures 21.
- the thickness of the base layer 22 changes corresponding to the uneven shape of the interface between the transparent substrate 10 and the transparent resin layer 20.
- the average thickness H2 of the base layer 22 is preferably 0.5 to 10 ⁇ m, more preferably 0.5 to 7 ⁇ m.
- the average thickness H2 of the base layer 22 is, for example, the film thickness of the transparent film 1A a plurality of times (for example, 10 times) using a digital length measuring device (Lightmatic VL-50S-B manufactured by Mitutoyo Corporation). It can be calculated by subtracting the height H1 (design value) of the structure 21 and the film thickness H3 of the transparent substrate 10 from the average film thickness measured and calculated.
- the average thickness H2 of the base layer 22 is preferably measured every about 10% or about 3 mm of the length of the longest side in a direction parallel to the longest side of the film width.
- the transparent resin layer 20 is formed of a transparent organic resin. As will be described later, when a transfer method is used to form the structure 21 in the transparent resin layer 20, the transparent resin layer 20 is preferably formed of a curable resin.
- the transparent resin layer 20 is more preferably formed of a curable resin having a high light transmittance after curing, a refractive index within a predetermined range described later, and a hydrophilic property.
- the refractive index of the curable resin constituting the transparent resin layer 20 is preferably 1.40 or more and 2.00 or less, and more preferably 1.43 or more and 2.00 or less.
- a resin having a high refractive index after curing has a high viscosity before curing. Therefore, when the refractive index of the curable resin exceeds 2.00, the structure 21 having a desired shape is formed when the structure 21 is formed on the surface of the transparent resin layer 20 by a transfer method as described later. This is not preferable because it becomes difficult.
- the transparent film 1A is hardly fogged by moisture. Therefore, when the face protection shield formed using the transparent film 1A is attached to the face of the wearer, the transparent film 1A can be prevented from being clouded by the breath of the wearer.
- the curable resin having hydrophilicity for example, an ultraviolet curable resin having a hydrophilic functional group is preferably used.
- an ultraviolet curable resin obtained by polymerizing a monofunctional monomer, a bifunctional monomer, or a polyfunctional monomer with a photopolymerization initiator is used. be able to.
- examples of the monofunctional monomer include carboxylic acid monomers (such as acrylic acid), hydroxy monomers (such as 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, and 4-hydroxybutyl acrylate), alkyl or alicyclic monomers.
- carboxylic acid monomers such as acrylic acid
- hydroxy monomers such as 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, and 4-hydroxybutyl acrylate
- alkyl or alicyclic monomers alkyl or alicyclic monomers.
- bifunctional monomer examples include tri (propylene glycol) diacrylate, trimethylolpropane diallyl ether, urethane acrylate, and the like.
- polyfunctional monomer examples include trimethylolpropane triacrylate, dipentaerythritol pentaacrylate, dipentaerythritol hexaacrylate, ditrimethylolpropane tetraacrylate, and the like.
- a curable resin obtained by polymerizing a monomer having a hydrophilic group such as a hydroxy group, a carboxy group, an amino group, or an amide group as described above is more preferable. preferable.
- photopolymerization initiators for polymerizing the above monomers examples include 2,2-dimethoxy-1,2-diphenylethane-1-one, 1-hydroxy-cyclohexyl phenyl ketone, 2-hydroxy-2-methyl-1- Phenylpropan-1-one or the like can be used.
- the composition before curing of the curable resin forming the transparent resin layer 20 may contain fillers such as inorganic fine particles and organic fine particles.
- the inorganic fine particles include metal oxide fine particles such as SiO 2 , TiO 2 , ZrO 2 , SnO 2 , and Al 2 O 3 .
- the organic fine particles include resin fine particles formed of a transparent organic resin.
- ком ⁇ онентs such as a leveling agent, a surface conditioner, and an antifoaming agent may be added to the composition before curing of the curable resin that forms the transparent resin layer 20.
- the transparent substrate 10 is formed from a transparent resin having flexibility, and supports the transparent resin layer 20. Moreover, in 1 A of transparent films which concern on this invention, the interface of the transparent base material 10 and the transparent resin layer 20 has uneven
- the uneven shape is, for example, a difference in height of the unevenness of 1/3 times or more with respect to the height of the structure 21, and the pitch of the unevenness is 100 times or more than the pitch of the arrangement pattern of the structures 21. Represents a long wavy shape.
- the uneven height difference Hw is preferably determined according to the average thickness of the base layer 22.
- the unevenness height difference Hw is preferably 0.1 to 1 ⁇ m.
- the height difference Hw is preferably 0.1 ⁇ m to 4.5 ⁇ m.
- the height difference Hw is preferably set to 0.1 to 9.5 ⁇ m.
- the pitch of the concavo-convex shape is preferably within a range of 1 to 100 mm, and preferably within a range of 2.5 to 50 mm, in order to make it easy to see a rainbow-colored reflection pattern that can be observed only by non-wearers. It is more preferable.
- corrugated shape which the interface of the transparent base material 10 and the transparent resin layer 20 has is preferable to form over a wide area
- the average thickness H3 of the transparent substrate 10 is appropriately selected according to how to use the transparent film 1A.
- the average thickness H3 of the transparent substrate 10 is preferably 10 ⁇ m or more and 500 ⁇ m or less, and 50 ⁇ m or more and 500 ⁇ m or less. Is more preferable, and 50 ⁇ m or more and 300 ⁇ m or less is more preferable.
- the face protection shield formed using the transparent film 1A can have sufficient protection performance against scattered objects or flying objects. Moreover, when the average thickness H3 of the transparent base material 10 is 500 micrometers or less, the transparent film 1A can be reduced in weight. In addition, since the transparency of the transparent film 1A is increased, the transparent film 1A can be easily deformed into a curved shape, so that a feeling of wearing as a protective member of the face protection shield can be improved.
- the average thickness H3 can be measured by a known method. For example, a digital length measuring device (Lightmatic VL-50S-B manufactured by Mitutoyo Corporation) can be used a plurality of times (for example, The average value at the time of measurement can be used.
- the refractive index of the transparent substrate 10 is different from the refractive index of the transparent resin layer 20.
- the difference in refractive index between light of the transparent substrate 10 and the transparent resin layer 20 at a wavelength of 589 nm is preferably 0.05 or more and 0.3 or less, and more preferably 0.05 or more and 0.2 or less.
- the thickness of the base layer 22 of the transparent resin layer 20 is provided with uneven thickness, and the front and back surfaces of the base layer 22.
- the reflected light from can be made to interfere. Specifically, the reflected light at the interface between the layer whose refractive index changes gently by the structure 21 (that is, the layer obtained by removing the base layer 22 from the transparent resin layer 20) and the base layer, and the transparent substrate 10 And the reflected light at the interface between the base layer 22 and the base layer 22 can be made to interfere with each other. Further, the degree of interference caused by the base layer 22 changes periodically because the base layer 22 has uneven thickness.
- the transparent film 1A improves the visibility from non-wearers while providing a bright and easy-to-see field of view for the wearer of the face protection shield using the transparent film 1A, and improves handling. Can be improved.
- the material for forming the transparent substrate 10 as described above for example, various known transparent resins having a refractive index different from that of the transparent resin layer 20 can be used.
- the forming material of the transparent substrate 10 includes polyethylene terephthalate (PET), polycarbonate (Polycarbonate: PC), methyl methacrylate polymer, styrene polymer, methyl methacrylate copolymer, styrene copolymer.
- Methyl methacrylate-styrene copolymer cellulose diacetate, cellulose triacetate, cellulose acetate butyrate, polyester, polyamide, polyimide, polyether sulfone, polysulfone, polypropylene, polymethylpentene, polyvinyl chloride, polyvinyl acetal, polyether ketone , Polyurethane, cycloolefin polymer, cycloolefin copolymer (COC), etc. It can be. In consideration of heat resistance, it is also possible to use an aramid resin as a material for forming the transparent substrate 10. Furthermore, a flexible thin film glass can be used as a material for forming the transparent substrate 10.
- the transparent film 1A for a face protection shield according to the present invention includes the transparent resin layer 20 in which a plurality of structures 21 each having a concave portion or a convex portion are provided at a pitch of a visible light wavelength or less. On the surface.
- the transparent film 1A according to the present invention can reduce the reflected light even under illumination with very high intensity.
- the light transmittance with respect to light having a wavelength of 550 nm can be 98.5% or more. .
- the transparent film 1A according to the present invention since the interface between the transparent substrate 10 and the transparent resin layer 20 has an uneven shape, the thickness of the base layer 22 that supports the structure 21 is changed, and the transparent substrate The refractive index of the material 10 and the transparent resin layer 20 is different. Thereby, in the transparent film 1A according to the present invention, the reflected light interferes with the base layer 22, and a rainbow-colored reflection pattern is observed. Since such a reflection pattern is observed only by a non-wearing person of the face protection shield using the transparent film 1A and is not observed by the wearing person, the transparent film 1A ensures the wearer's field of view while not wearing the wearing person. Visibility from can be improved.
- the transparent film 1A for face protection shield in order to improve the visibility from a non-wearing person, it is possible to put a frame on the transparent film 1A or to perform printing partially. In this case, the manufacturing cost increases.
- the transparent film 1A according to the present invention can be obtained by using a nip roller having a concavo-convex shape on the surface of the transparent substrate 10, for example, by using a nip roller having a concavo-convex shape on the surface when the film used as the transparent substrate 10 is manufactured.
- a nip roller having a concavo-convex shape on the surface when the film used as the transparent substrate 10 is manufactured By surface-treating the material 10, it can be formed at a low cost. Therefore, the transparent film 1A according to the present invention can suppress an increase in manufacturing cost.
- the transparent resin layer 20 is formed on the transparent base material 10 having a concavo-convex shape on the surface, and the structure 21 is formed on the transparent resin layer 20 by a transfer method or the like. 1A can be manufactured.
- a resin sheet to be used as the transparent substrate 10 is prepared.
- the resin sheet has a concavo-convex shape on its surface by using, for example, a nip roller having a concavo-convex shape at the time of molding.
- an uncured ultraviolet curable resin composition is applied to the surface of the resin sheet on which the concavo-convex shape is formed, the application surface is brought into close contact with the master having the moth-eye structure, and then irradiated with ultraviolet rays or the like.
- the ultraviolet curable resin composition is cured.
- the transparent film 1A can be produced by peeling the resin sheet from the master.
- the ultraviolet curable resin composition is a mixture of an ultraviolet curable resin, a photopolymerization initiator, other fillers, additives, and the like.
- the master with the moth-eye structure formed can be manufactured by the following method. Specifically, as described in International Publication No. 2012/133944, first, a resist is applied to a roll-shaped glass master, and then patterned by photolithography using a laser beam, so that a fine surface is formed. You may manufacture the original disk in which the uneven
- FIG. 3 is a cross-sectional view schematically showing a cross section of the transparent film according to the first modification of the present embodiment cut in the thickness direction.
- 4 and 5 are cross-sectional views schematically showing a cross section of the transparent film according to the second modification of the present embodiment cut in the thickness direction.
- the transparent film 1B is provided with a surface treatment layer 10b on one side of a transparent resin sheet 10a having a flat front and back, and a transparent resin on the surface treatment layer 10b.
- Layer 20 is formed.
- corrugated shape is formed in the surface at the side of the transparent resin layer 20 of the surface treatment layer 10b.
- Such a surface treatment layer 10b functions as an anchor coat layer or a primer layer that enhances the adhesion between the transparent resin sheet 10a and the transparent resin layer 20.
- the surface treatment layer 10b may be formed as a coating layer made of, for example, an organoalkoxymetal compound, polyester, acrylic-modified polyester, or polyurethane.
- the surface treatment layer 10b may be applied using a coating roll having an uneven shape on the surface.
- the transparent resin layer 20 is provided on both surfaces of the transparent substrate 10.
- the transparent resin layer 20 is provided on both surfaces of the transparent base material 10 through the surface treatment layer 10b.
- the transparent resin layer 20 on both surfaces of the transparent substrate 10, reflected light is suppressed even when the illumination intensity is very strong, such as surgical lighting, and the light transmittance of the transparent films 1C and 1D is 99. % Or more.
- the transparent films 1C and 1D having extremely high transparency, in order to improve visibility and handling, an rainbow-colored reflection pattern is observed with the interface between the transparent substrate 10 and the transparent resin layer 20 as an uneven shape. The significance of doing this is particularly high.
- the structures 21 formed in the transparent resin layers 20 do not necessarily have the same shape, height, pitch, and the like, but may be different. Good.
- the height of the structure 21 of the transparent resin layer 20 provided on one surface of the transparent substrate 10 is H1a, the average thickness of the transparent substrate 10 is H3, and the other surface of the transparent substrate 10 is provided.
- H1a: H3: H1b 18-30: 800-300000: 18- 30 is preferable
- H1a: H3: H1b 18 to 30: 1000 to 50000: 18 to 30 is more preferable.
- the face protection shield is, for example, a transparent shield material such as a goggle type, a face mask type, or a sun visor type that is used by medical personnel to protect the face.
- a face protection shield can be obtained by attaching the transparent film according to the present invention to a face mask or the like so as to be fixed or detachable.
- the object which attaches the transparent film which concerns on this invention is not limited to a face mask.
- the transparent film according to the present invention may be attached to a sun visor type cover, and can be appropriately selected according to the form of the face protection shield.
- FIG. 6 is a plan view of a face protection shield 70 in which the transparent film 1 according to the present invention is fixed to the face mask 71 as an eye shield 73.
- FIG. 7 is a perspective view showing a state in which the face protection shield 70 shown in FIG. 6 is attached to the face.
- the face mask 71 covers a part of the wearer's nose, mouth and chin, and is held on the face by a string 72 or the like.
- any medical face mask can be used.
- a mask having air permeability and a multilayer structure can be used to prevent bacteria from entering.
- the eye shield 73 is formed of the transparent film 1 according to the present invention, and is fixed to the face mask 71 and the joining regions 74A and 74B in order to prevent liquids and scattered objects from flying into the eyes of the wearer.
- the eye shield 73 has a sufficiently large width with respect to the width of the face mask 71, and has a size that can cover the wearer's eyes widely.
- the eye shield 73 has a recess 75 at the center of the lower side. By having such a dent 75, when the face protection shield 70 is worn on the face, the eye shield 73 can bend around the wearer's nose and become a curved surface along the face.
- the joining regions 74A and 74B are provided at the left and right end portions of the face mask 71 that become the side of the nose when worn.
- a method of fixing the eye shield 73 and the face mask 71 in the bonding regions 74A and 74B ultrasonic welding, thermal bonding, mechanical bonding such as wrinkles, and the like can be used.
- the joining regions 74A and 74B may have any size as long as the eye shield 73 can be fixed.
- the joining regions 74A and 74B can have a width of 3 to 15 mm and a length of 5 to 30 mm.
- Such joint regions 74A and 74B eliminate the need to press the eye shield 73 against the face with the string 72, so that the face protection shield 70 can be easily attached and detached.
- Examples 1 and 2 and Comparative Example 1 A transparent film having a transparent resin layer in which a moth-eye structure is formed on both sides of a transparent substrate by the following process, and having an irregular shape at the interface between the transparent resin layer and the transparent substrate (that is, the interface has undulations) was made.
- a transparent film formed of the resin shown in Table 1 was prepared as a transparent substrate.
- the pitches of the concavo-convex shapes of the transparent films according to Examples 1 and 2 and Comparative Example 1 were in the range of 1 to 100 mm, and the height difference was in the range of 0.1 to 9.5 ⁇ m.
- the refractive index (wavelength 589 nm (sodium D line)) of each transparent substrate was measured with an Abbe refractometer (manufactured by Atago Co., Ltd.).
- a UV curable resin composition having a hydrophilic group A few drops of a UV curable resin composition having a hydrophilic group was dropped on the master, and a transparent base material was pressure-bonded to the master and irradiated with UV.
- a UV curable resin composition having a hydrophilic group a weight ratio of urethane acrylate (EBECRYL 9270 manufactured by Daicel Cytec Co., Ltd.) and methoxypolyethylene glycol monomethacrylate (SR550 manufactured by Sartomer Co., Ltd.) is 7: 3.
- a mixture obtained by adding 3% by mass of the photopolymerization initiator Irgacure 184 (manufactured by BSAF Japan Co., Ltd.) to the total mass of the UV curable resin composition was used.
- UV irradiation was performed by irradiating with 1000 mJ ultraviolet rays for 1 minute from the transparent substrate side.
- the transparent film was released from the master, and a transparent film having a transparent resin layer formed on one surface of the transparent substrate as shown in FIG. 1 was obtained.
- a transparent resin layer was formed on the other surface opposite to one surface of the transparent substrate 10 to obtain a transparent film having a transparent resin layer formed on both surfaces of the transparent substrate as shown in FIG.
- the refractive index of the transparent resin layer (wavelength 589 nm (sodium D line)) was measured with an Abbe refractometer (manufactured by Atago Co., Ltd.). Met.
- UV curable resin urethane acrylate (EBECRYL 9270 manufactured by Daicel-Cytec Co., Ltd.) and methoxypolyethylene glycol monomethacrylate (SR550 manufactured by Sartomer Co., Ltd.) are mixed with a photopolymerization initiator Irgacure 184 (BSAF Japan).
- BSAF Japan photopolymerization initiator
- a product obtained by adding 3% by weight to the total mass of the UV curable resin composition was used.
- the mixing ratio of urethane acrylate and methoxypolyethylene glycol monomethacrylate was adjusted so that the refractive index of the cured product of the UV curable resin was 1.58.
- UV irradiation was performed by irradiating with 1000 mJ ultraviolet rays for 1 minute from the transparent substrate side. As a result, a flat UV curable resin layer having the same refractive index on the transparent substrate was obtained.
- the height difference of the UV curable resin layer was measured in the same manner as described above, the height difference was less than 0.1 ⁇ m.
- a transparent resin layer (refractive index of 1.53) on the flat UV curable resin layer in the same procedure as in Example 1, the transparent resin layer, the underlying UV curable resin layer, and the transparent group are formed. There was a difference in refractive index between the materials, and a transparent film was obtained in which the interface between the transparent resin layer and the UV curable resin layer was not an uneven shape but was flat.
- the visibility was evaluated by the following method. First, a transparent film was installed so that the film surface was facing the front of the observer, and a white fluorescent lamp was installed as illumination light above the transparent film and the midpoint of the observer. Next, the illuminance of the white fluorescent lamp was set to 2000 lux or 500 lux, and the observer was allowed to observe the transparent film. In this case, the visibility (visibility) of the transparent film from the observer was evaluated in five stages from “1” where the transparent film is easily visible due to the reflective pattern and “5” where the transparent film is not visible.
- the transparent film according to Examples 1 and 2 is actually cut to a size that can cover most of the observer's field of view, and is attached to the observer as a face protection shield. As a result of checking the appearance, it was found that a good field of view was obtained.
- Example 3 Moreover, the transparent film with which the transparent resin layer was formed only in the single side
- the thickness variation in the film width direction of the transparent substrate was measured. Specifically, 20 or more measurement points were provided in the range of 600 mm in the film width direction, and each measurement point was measured 10 times using a digital length measuring device (Lightmatic VL-50S-B manufactured by Mitutoyo Corporation). It was measured.
- FIG. 8 is a graph showing the results.
- the interface of a transparent base material and a transparent resin layer is also the same uneven
- corrugated shape of the interface of a transparent base material and a transparent resin layer can be measured also using a laser microscope etc. other than the method mentioned above, for example.
- the light transmittance and Haze (turbidity) of the transparent film according to Example 3 were measured in the same manner as in Example 1, the light transmittance was 94.8% and the Haze was 0.3%.
- the visibility of the transparent film which concerns on Example 3 was evaluated by the method similar to Example 1, it was possible to confirm a reflective pattern and it has confirmed that the visibility was improving.
- the transparent film which concerns on Example 3 was mounted
- a flat PET (refractive index 1.60) film or PC (refractive index 1.58) film was used as a transparent substrate, and a structure was formed in the same manner as in Example 1.
- a transparent resin layer (refractive index 1.53) was laminated on a transparent substrate to produce a transparent film for testing.
- the test transparent film is irradiated with a white fluorescent lamp, the lightness L * and chromaticity in the L * a * b * color system are changed by changing the thickness of the base layer in the range of 0 to 10 ⁇ m. It was simulated how a * and b * change.
- TFCalc manufactured by Software Spectra Inc.
- the color of the transparent film changes periodically every time the thickness of the base layer changes by about 1500 nm. Therefore, in consideration of the results shown in FIGS. 9A, 9B, and 9C, if the interface between the transparent base material and the transparent resin layer has an uneven shape in which the thickness of the base layer varies by 0.1 ⁇ m or more, it is not mounted It was found that the person can visually recognize the change in the color tone of the transparent film. Therefore, it was found that the height difference of the unevenness of the uneven shape is preferably in the range of 0.1 to 9.5 ⁇ m.
- Face protection transparent film Transparent substrate 10a Transparent resin sheet 10b Surface treatment layer 20 Transparent resin layer 21 Structure 22 Base layer 70 Face protection shield 71 Face mask 72 String 73 Eye shield 74a, 74b Joining area 75 Depression
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Abstract
Description
<1.1.概要>
まず、図1および図2を参照して、本発明の一実施形態に係る顔面保護シールド用透明フィルム(以下、単に透明フィルムともいう)について説明する。図1は、本発明の一実施形態に係る顔面保護シールド用透明フィルム1Aを厚み方向に切断した断面を模式的に示した断面図であり、図2は、顔面保護シールド用透明フィルム1Aをフィルム面に垂直な方向から見た模式的な平面図である。
(透明樹脂層)
透明樹脂層20は、可視光の波長以下のピッチで2次元的に複数配設された凹部又は凸部からなる複数の構造体21(モスアイ構造)と、個々の構造体21を支持し、構造体21と一体に形成された基底層22と、を有する。このようなモスアイ構造により、透明樹脂層20は、反射防止特性を備えることができる。
透明基材10は、可撓性を有する透明樹脂から形成され、透明樹脂層20を支持する。また、本発明に係る透明フィルム1Aにおいて、透明基材10と透明樹脂層20との界面は、凹凸形状を有する。より具体的には、透明基材10の透明樹脂層20側の表面には、凹凸形状が形成される。この凹凸形状により、透明樹脂層20の基底層22に厚みムラを形成することができるため、透明フィルム1Aは、非装着者のみから観察可能な反射模様を備えることが可能となる。
透明フィルム1Aの製造方法としては、例えば、表面に凹凸形状を有する透明基材10上に透明樹脂層20を形成し、転写法などにより透明樹脂層20に構造体21を形成することで透明フィルム1Aを製造することができる。
続いて、図3~図5を参照して、本実施形態に係る透明フィルムの種々の変形例について説明する。図3は、本実施形態の第1の変形例に係る透明フィルムを厚み方向に切断した断面を模式的に示した断面図である。図4および5は、本実施形態の第2の変形例に係る透明フィルムを厚み方向に切断した断面を模式的に示した断面図である。
第1の変形例では、図3に示すように、透明フィルム1Bは、表裏が平坦に形成されている透明樹脂シート10aの片面に表面処理層10bが設けられ、表面処理層10b上に透明樹脂層20が形成されている。また、表面処理層10bの透明樹脂層20側の表面には、凹凸形状が形成されている。
第2の変形例では、図4および図5に示すように、透明基材10の両面に透明樹脂層20が設けられる。このような場合、透明基材10と透明樹脂層20との少なくともいずれか一方の界面が凹凸形状であればよい。
次に、図6および図7を参照して、本発明に係る透明フィルムを用いた顔面保護シールドについて説明する。顔面保護シールドは、例えば、医療従事者等が顔面を保護するために使用するゴーグル型、顔面マスク型、サンバイザー型などの透明シールド材である。このような顔面保護シールドは、本発明に係る透明フィルムを顔面マスク等に固着又は着脱自在に取り付けることにより得ることができる。なお、本発明に係る透明フィルムを取り付ける対象は、顔面マスクに限定されない。例えば、本発明に係る透明フィルムをサンバイザー型の被り物に取り付けてもよく、顔面保護シールドの形態に応じて、適宜選択することができる。
次の工程により透明基材の両面にモスアイ構造が形成された透明樹脂層を有し、透明樹脂層と透明基材の間の界面が凹凸形状である(すなわち、界面がうねりを有する)透明フィルムを作製した。
透明樹脂層と透明基材との間に屈折率差があり、透明樹脂層と透明基材との間の界面が凹凸形状ではなく平坦である透明フィルムを次の工程により作製した。
実施例1、2及び比較例1、2に係る透明フィルムについて、光透過率及びHaze(濁度)をヘイズメーター((株)村上色彩技術研究所製HM-150)により測定した。
また、実施例1と同様の方法で、図1に示すような、透明基材の片面のみに透明樹脂層が形成された透明フィルムを作製した。
さらに、透明基材と透明樹脂層との界面における凹凸形状の高低差がどの程度である場合に、透明フィルムにおいて虹色に色調が変化した反射模様が視認されるかを検討した。
10 透明基材
10a 透明樹脂シート
10b 表面処理層
20 透明樹脂層
21 構造体
22 基底層
70 顔面保護シールド
71 顔面マスク
72 紐
73 アイシールド
74a、74b 接合領域
75 凹み
Claims (6)
- 可撓性を有する透明基材と、
前記透明基材の少なくともいずれかの一面に積層され、可視光波長以下のピッチで複数設けられた凹部又は凸部からなる構造体を表面に有する透明樹脂層と、を備え、
前記透明基材および前記透明樹脂層の屈折率は異なり、
前記透明基材と前記透明樹脂層との界面は、凹凸形状である、顔面保護シールド用透明フィルム。 - 前記透明基材および前記透明樹脂層の波長589nmの光に対する屈折率の差は、0.05以上である請求項1に記載の顔面保護シールド用透明フィルム。
- 前記凹凸形状は、高低差が0.1~9.5μmの範囲内であり、ピッチが1~100mmの範囲内である、請求項1又は2に記載の顔面保護シールド用透明フィルム。
- 前記透明樹脂層は、前記透明基材の両面に積層される、請求項1~3のいずれか一項に記載の顔面保護シールド用透明フィルム。
- 前記透明樹脂層は、親水性官能基を有する紫外線硬化性樹脂組成物の硬化物である、請求項1~4のいずれか一項に記載の顔面保護シールド用透明フィルム。
- 請求項1~5のいずれか一項に記載の顔面保護シールド用透明フィルムが取り付けられた、顔面保護シールド。
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EP15825390.6A EP3165358B1 (en) | 2014-07-23 | 2015-05-27 | Transparent film for face protective shield |
US15/328,335 US10575572B2 (en) | 2014-07-23 | 2015-05-27 | Transparent film for face protection shield |
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Also Published As
Publication number | Publication date |
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JP2016029446A (ja) | 2016-03-03 |
KR102444982B1 (ko) | 2022-09-19 |
JP6458392B2 (ja) | 2019-01-30 |
EP3165358B1 (en) | 2020-01-01 |
KR20170039085A (ko) | 2017-04-10 |
US10575572B2 (en) | 2020-03-03 |
US20170208878A1 (en) | 2017-07-27 |
EP3165358A1 (en) | 2017-05-10 |
TWI680869B (zh) | 2020-01-01 |
EP3165358A4 (en) | 2018-03-07 |
TW201604008A (zh) | 2016-02-01 |
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