WO2022196567A1 - 光学フィルム、並びに、これを用いたディスプレイ部材及びディスプレイ装置 - Google Patents
光学フィルム、並びに、これを用いたディスプレイ部材及びディスプレイ装置 Download PDFInfo
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- WO2022196567A1 WO2022196567A1 PCT/JP2022/010977 JP2022010977W WO2022196567A1 WO 2022196567 A1 WO2022196567 A1 WO 2022196567A1 JP 2022010977 W JP2022010977 W JP 2022010977W WO 2022196567 A1 WO2022196567 A1 WO 2022196567A1
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- optical film
- hard coat
- coat layer
- display device
- film
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- 239000012788 optical film Substances 0.000 title claims abstract description 58
- 239000010408 film Substances 0.000 claims abstract description 29
- -1 polysiloxane Polymers 0.000 claims abstract description 15
- 125000000524 functional group Chemical group 0.000 claims abstract description 14
- 229920001296 polysiloxane Polymers 0.000 claims abstract description 11
- 229920001721 polyimide Polymers 0.000 claims abstract description 9
- 239000004642 Polyimide Substances 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 claims description 15
- 239000011347 resin Substances 0.000 claims description 13
- 229920005989 resin Polymers 0.000 claims description 13
- 125000002091 cationic group Chemical group 0.000 claims description 3
- 125000003700 epoxy group Chemical group 0.000 claims description 2
- 239000000758 substrate Substances 0.000 abstract description 8
- 239000010410 layer Substances 0.000 description 51
- 239000011248 coating agent Substances 0.000 description 17
- 238000000576 coating method Methods 0.000 description 17
- 239000007788 liquid Substances 0.000 description 10
- 230000001681 protective effect Effects 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 7
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 6
- 238000011156 evaluation Methods 0.000 description 6
- 239000002904 solvent Substances 0.000 description 6
- NTIZESTWPVYFNL-UHFFFAOYSA-N Methyl isobutyl ketone Chemical compound CC(C)CC(C)=O NTIZESTWPVYFNL-UHFFFAOYSA-N 0.000 description 5
- UIHCLUNTQKBZGK-UHFFFAOYSA-N Methyl isobutyl ketone Natural products CCC(C)C(C)=O UIHCLUNTQKBZGK-UHFFFAOYSA-N 0.000 description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical group [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 5
- 238000001723 curing Methods 0.000 description 5
- 229910052710 silicon Inorganic materials 0.000 description 5
- 238000005452 bending Methods 0.000 description 4
- 238000010538 cationic polymerization reaction Methods 0.000 description 4
- 239000006059 cover glass Substances 0.000 description 4
- 239000012046 mixed solvent Substances 0.000 description 4
- 150000002894 organic compounds Chemical class 0.000 description 4
- 239000004593 Epoxy Substances 0.000 description 3
- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 150000002484 inorganic compounds Chemical class 0.000 description 3
- 229910010272 inorganic material Inorganic materials 0.000 description 3
- 239000003505 polymerization initiator Substances 0.000 description 3
- 239000007870 radical polymerization initiator Substances 0.000 description 3
- XBDQKXXYIPTUBI-UHFFFAOYSA-M Propionate Chemical compound CCC([O-])=O XBDQKXXYIPTUBI-UHFFFAOYSA-M 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- KXKVLQRXCPHEJC-UHFFFAOYSA-N acetic acid trimethyl ester Natural products COC(C)=O KXKVLQRXCPHEJC-UHFFFAOYSA-N 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- UHESRSKEBRADOO-UHFFFAOYSA-N ethyl carbamate;prop-2-enoic acid Chemical compound OC(=O)C=C.CCOC(N)=O UHESRSKEBRADOO-UHFFFAOYSA-N 0.000 description 2
- 229910003471 inorganic composite material Inorganic materials 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 238000010526 radical polymerization reaction Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- XNWFRZJHXBZDAG-UHFFFAOYSA-N 2-METHOXYETHANOL Chemical compound COCCO XNWFRZJHXBZDAG-UHFFFAOYSA-N 0.000 description 1
- 239000002202 Polyethylene glycol Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 125000002723 alicyclic group Chemical group 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000005354 aluminosilicate glass Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 125000001033 ether group Chemical group 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 125000003055 glycidyl group Chemical group C(C1CO1)* 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000002346 layers by function Substances 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229920001223 polyethylene glycol Polymers 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000009281 ultraviolet germicidal irradiation Methods 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
Images
Classifications
-
- 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
- G02B1/14—Protective coatings, e.g. hard coatings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
-
- 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
-
- 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
- B32B27/28—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
- B32B27/281—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42 comprising polyimides
-
- 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
- B32B27/28—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
- B32B27/283—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42 comprising polysiloxanes
-
- 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
- B32B27/38—Layered products comprising a layer of synthetic resin comprising epoxy resins
-
- 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
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/02—Details
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/80—Constructional details
- H10K59/8793—Arrangements for polarized light emission
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/80—Constructional details
- H10K59/8791—Arrangements for improving contrast, e.g. preventing reflection of ambient light
Definitions
- the present invention relates to an optical film for screen protection, and a display member and a display device using the same.
- Patent Document 1 describes a cover glass having a thickness of 0.3 to 1.5 mm, which is formed by chemically strengthening a substrate such as aluminosilicate glass.
- the resin film has flexibility, its surface hardness is inferior to that of glass, so it is necessary to compensate for the hardness by providing a hard coat layer on the surface of the resin film.
- a film having a cured resin layer such as a hard coat layer on a substrate tends to curl. It is desired that the curl is small so as not to impair the mechanical suitability during film production and the workability in subsequent steps.
- an object of the present invention is to provide an optical film that achieves both high flexibility and high hardness and has reduced curling.
- the present invention provides an optical film in which a hard coat layer is laminated on a polyimide base material, the hard coat layer comprising a cured film of polysiloxane having a cationic polymerizable organic functional group,
- a rectangle having a short side of 50 mm in length parallel to the flow direction and a long side of 150 mm in length parallel to the width direction perpendicular to the flow direction is cut, and the cut sample is placed on a flat surface , the average value of the distance between both ends of one short side and the distance between both ends of the other short side is 18 mm or more.
- a display member and a display device according to the present invention are provided with the above optical film.
- FIG. 1 is a cross-sectional view showing a schematic configuration of a display device according to an embodiment.
- FIG. 2 is a cross-sectional view showing the layer structure of the optical film shown in FIG.
- FIG. 3 is an explanatory diagram of a curl measuring method for an optical film.
- FIG. 1 is a cross-sectional view showing the schematic configuration of the display device according to the embodiment
- FIG. 2 is a cross-sectional view showing the layer configuration of the optical film shown in FIG.
- the display device 10 includes a circularly polarizing plate 3, a resin film 2 and an optical film 1 in this order on the display surface side of the display panel 4.
- a self-luminous panel such as an organic EL panel or a micro LED can be preferably used.
- Circular polarizer 3 is composed of a linear polarizer and a quarter-wave plate, and is provided to suppress reflection of light incident on display panel 4 .
- the resin film 2 is provided, for example, to improve the surface hardness of the display device 10 .
- the material of the resin film 2 is not particularly limited, for example, polyimide can be preferably used. However, the resin film 2 may be omitted.
- the display panel 4, the circularly polarizing plate 3, the resin film 2, and the optical film 1, which constitute the display device 10, are all made of a resin film as a base material, and the display device 10 is bendable.
- a foldable portable terminal can be configured by attaching the foldable display device 10 to a foldable main body via a hinge.
- the optical film 1 is a protective film provided on the outermost surface of the display device 10 and replaces the function of the cover glass. As shown in FIG. 2, the optical film 1 is formed by laminating a hard coat layer 6 on one side of a substrate 5, and has flexibility.
- the base material 5 is a transparent polyimide film, and has durability against repeated bending due to the excellent mechanical strength of polyimide.
- the thickness of the substrate 5 is not particularly limited, it is preferably 20 to 80 ⁇ m.
- the hard coat layer 6 is a functional layer for imparting hardness to the optical film 1 .
- the hard coat layer 6 is a cured film obtained by cationic polymerization of polysiloxane having a cationic polymerizable organic functional group and a siloxane bond. Since the optical film 1 according to this embodiment is used as a protective film for the foldable display device 10, the hard coat layer 6 requires both hardness and flexibility.
- the hard coat layer is formed from a polymerizable organic compound, it is possible to obtain an optical film having flexibility, but the hardness of the hard coat layer tends to be insufficient. If the thickness of the hard coat layer is increased to compensate for the hardness, the hard coat layer is likely to crack when folded, resulting in a decrease in flexibility, and in addition, the curl of the resulting optical film increases. more likely to cause problems. Therefore, when the hard coat layer is formed of a polymerizable organic compound, it is difficult to obtain an optical film having both surface hardness, flexibility and low curling properties. Further, when the hard coat layer is formed of an inorganic compound, the surface hardness is increased, but the hard coat layer is easily cracked and flexibility cannot be obtained.
- the hard coat layer 6 is formed of an organic-inorganic composite material having a cationically polymerizable organic functional group and a siloxane bond, the organic structural portion in which the organic functional groups are polymerized with each other is necessary for bending. In addition to exhibiting excellent flexibility, hardness required as a protective film is exhibited by the inorganic structural portion composed of siloxane bonds.
- Polysiloxane is an oligomer having a siloxane bond as a skeleton, and the constituent units are an M unit in which three organic functional groups are bonded to a silicon atom, a D unit in which two organic functional groups are bonded to a silicon atom, and an organic There are T units with one functional group attached and Q units with no organic functional groups attached to the silicon atom.
- polysiloxane having a network structure containing T units can be used as a material for forming the hard coat layer 6 according to the present embodiment.
- Examples of cationically polymerizable organic functional groups possessed by polysiloxane include glycidyl groups such as 3-glycidoxypropyl groups, and cyclic groups such as alicyclic epoxy groups such as 2-(3,4 epoxy)cyclohexylethyl groups. Ether groups and vinyl groups can be mentioned.
- the hard coat layer 6 is formed by applying a coating liquid containing polysiloxane having a cationically polymerizable organic functional group and a thermal cationic polymerization initiator or a photocationic polymerization initiator to the polyimide base material 5, followed by heating or light (ultraviolet rays). ) can be formed by curing the coating film by irradiation.
- the coating solution for forming the hard coat layer may contain a solvent, a curing accelerator, and other additives. Since the polymerization reaction proceeds rapidly in radical polymerization, curling tends to occur as the coating film hardens.
- the curl of the optical film 1 becomes too large, the mechanical suitability in the manufacturing process of the optical film is deteriorated, and there is a possibility that problems such as breakage may occur. Moreover, if the curl of the optical film 1 is too large, there is a possibility that a problem will occur when the optical film 1 is attached to the circularly polarizing plate.
- the hard coat layer 6 is cured by cationic polymerization, curling can be suppressed in exchange for the slow progress of the polymerization reaction.
- FIG. 3 is an explanatory diagram of the curl measurement method of the optical film.
- the optical film 1 according to the present embodiment is divided into a short side of 50 mm in length parallel to the machine direction (MD direction) and a long side of 150 mm in length parallel to the width direction (TD) perpendicular to the machine direction. Cut into rectangles with Next, as shown in FIG. 3, the cut sample is placed on a flat surface (on clean paper laid on a flat workbench).
- the average value of the distance A between both ends of one short side and the distance B between both ends of the other short side is 18 mm or more.
- the average value of the distances A and B is 18 mm or more, curling is suppressed, and the influence of curling in the manufacturing process of the optical film 1 and the manufacturing process of the display device 10 can be reduced. If the average value of the distances A and B is less than 18 mm, the curl increases to such an extent that the cut sample curls into a cylindrical shape, and the mechanical suitability in the manufacturing process of the optical film 1 and the manufacturing process of the display device 10 deteriorates.
- the thickness (after curing) of the hard coat layer 6 is preferably 5 to 30 ⁇ m. If the thickness of the hard coat layer 6 is less than 5 ⁇ m, the surface hardness may be insufficient. Further, when the thickness of the hard coat layer 6 exceeds 30 ⁇ m, the hard coat layer 6 is likely to crack due to repeated folding of the optical film 1, and the flexibility may deteriorate. Therefore, the thickness of the hard coat layer 6 is preferably within the above range in order to achieve both surface hardness and flexibility.
- the optical film 1 according to the present embodiment includes the hard coat layer 6 having both organic functional group-derived structural units and inorganic structural units composed of siloxane bonds on the polyimide base material 5, the hard coat layer 6 has flexibility derived from organic structural units and surface hardness derived from inorganic structural units. Therefore, the optical film 1 according to this embodiment is suitable as a protective film for a display device (portable terminal) having a foldable display screen.
- the optical film 1 according to this embodiment may constitute a display member for constituting a display device.
- the display member include a structure in which an adhesive is laminated on the back surface of the substrate 5 of the optical film 1 (the surface opposite to the hard coat layer 6), and a structure in which another resin is laminated on the back surface of the substrate 5 of the optical film 1.
- a configuration in which films are bonded together, a configuration in which a circularly polarizing plate is bonded to the back side of the base material 5 of the optical film 1, and the like can be mentioned.
- a polyimide film having a thickness of 50 ⁇ m was used as a base material. Moreover, the following composition was used as a coating liquid for forming a hard coat layer.
- ⁇ Coating liquid for forming hard coat layer 1 organic compound system> A main agent containing 30 parts by mass of urethane acrylate, 9 parts by mass of dimethyl carbonate, and 9 parts by mass of an acrylic ester compound, 2 parts by mass of a radical polymerization initiator, a solvent (methyl acetate, dimethyl carbonate (DMC), methyl isobutyl ketone (MIBK) and a mixed solvent of polyethylene glycol monomethyl ether (PGME)) were mixed to prepare a coating liquid 1 for forming a hard coat layer.
- DMC dimethyl carbonate
- MIBK methyl isobutyl ketone
- PGME polyethylene glycol monomethyl ether
- ⁇ Coating liquid for forming hard coat layer 2 Inorganic compound system> A main agent containing 28 parts by mass of urethane acrylate and 20 parts by mass of an inorganic dispersion such as silica/alumina is mixed with 2 parts by mass of a radical polymerization initiator and 50 parts by mass of a solvent (a mixed solvent of methyl acetate, DMC and MIBK), A coating liquid 2 for forming a hard coat layer was prepared.
- ⁇ Hard Coat Layer Forming Coating Liquid 3 Organic-Inorganic Hybrid Compound System> 48 parts by mass of polysiloxane having a T unit having a 2-(3,4 epoxy) cyclohexylethyl group per silicon atom, 2 parts by mass of a radical polymerization initiator, a solvent (mixed solvent of ethyl acetate and MIBK) 50 parts by mass were mixed to prepare a coating liquid 3 for forming a hard coat layer.
- ⁇ Hard Coat Layer Forming Coating Liquid 4 Organic-Inorganic Hybrid Compound System> 48 parts by mass of polysiloxane having a T unit having a 2-(3,4 epoxy) cyclohexylethyl group per silicon atom, 2 parts by mass of a cationic polymerization initiator, a solvent (mixed solvent of ethyl acetate and MIBK) 50 parts by mass were mixed to prepare a coating liquid 4 for forming a hard coat layer.
- Examples 1-3 Using a bar coater, the coating solution for forming a hard coat layer shown in Table 1 was applied to one side of the substrate in such a thickness that the hard coat layer after curing would have the thickness shown in Table 1. The coating was dried in a drying oven at 40-100° C. for 30-60 seconds to remove the solvent. Thereafter, the coating film was cured by irradiating ultraviolet rays, and then heated at 100° C. for 2 hours (post-heating treatment) to prepare optical films according to Examples 1 to 3.
- Comparative Examples 1 to 6 Optical films according to Comparative Examples 1 to 6 were produced in the same manner as in Examples 1 to 3, except that the post-heat treatment was not performed after the coating film was cured by UV irradiation.
- optical films of Examples 1-3 and Comparative Examples 1-6 were evaluated for pencil hardness, flexibility and curl.
- the evaluation method and evaluation criteria are as follows.
- ⁇ Pencil hardness> Based on JIS K5600 (4.9 N load), a pencil scratch tester (HA-301, Tester Sangyo Co., Ltd.) was used to measure the pencil hardness of the hard coat layer surface. When the measured pencil hardness was 7H or more, it was determined that the surface hardness was sufficient.
- Flexibility was evaluated using a U-shaped no-load bending tester manufactured by Yuasa System Co., Ltd. A sample of the optical film cut to 80 mm (machine direction) ⁇ 30 mm (width direction) was attached to a measuring jig, and a 200,000-times repeated bending test was performed with the hard coat layer inside. After the test, the bent portion was visually and microscopically observed. If there was no change in the appearance of the hard coat layer, it was judged as OK.
- ⁇ Curl> An optical film was cut into a size of 50 mm (machine direction) ⁇ 150 mm (width direction), and the cut sample was placed on clean paper laid on a flat workbench (see FIG. 3). A distance A between both ends of one short side of the placed sample and a distance B between both ends of the other short side of the sample were measured, and the average value of the distances A and B was taken as the curl evaluation value. When the curl evaluation value was 18 mm or more, it was determined that the curl was suppressed. When the curl was large and the sample was rolled into a cylinder, the diameter of the sample rolled into a cylinder was used as the evaluation value.
- Table 1 also shows the materials of the hard coat layer, the curing method, the thickness of the hard coat layer, and the evaluation values of pencil hardness, flexibility, and curl in Examples 1 to 3 and Comparative Examples 1 to 6.
- optical films according to Examples 1 to 3 were excellent in surface hardness and flexibility, and had performance suitable for protective films of foldable display devices. Further, it was confirmed that the optical films according to Examples 1 to 3 hardly curled and had excellent mechanical suitability in the manufacturing process.
- the optical films according to Comparative Examples 1 and 2 were inferior in surface hardness to those of Examples 1-3. Further, as can be seen from the comparison of Comparative Examples 1 and 2, increasing the thickness of the hard coat layer made of an organic compound can improve the pencil hardness, but reduces flexibility and worsens curling.
- the optical films according to Comparative Examples 3 and 4 had a surface hardness as high as that of Examples due to the formation of the hard coat layer using an inorganic compound, but the flexibility was insufficient. , the curl was also large.
- the present invention can be used as a protective optical film provided on the outermost surface of a display device, and is particularly suitable as an optical film for a display device having a foldable display screen.
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Abstract
Description
基材として厚み50μmのポリイミドフィルムを使用した。また、ハードコート層形成用塗液として、以下の組成物を使用した。
<ハードコート層形成用塗液1:有機化合物系>
ウレタンアクリレート30質量部、ジメチルカーボネート9質量部、アクリル酸エステル化合物9質量部を含有する主剤に、ラジカル重合開始剤2質量部、溶剤(酢酸メチル、ジメチルカーボネート(DMC)、メチルイソブチルケトン(MIBK)、ポリエチレングリコールモノメチルエーテル(PGME)の混合溶剤)50質量部を混合して、ハードコート層形成用塗液1を調製した。
<ハードコート層形成用塗液2:無機化合物系>
ウレタンアクリレート28質量部、シリカ・アルミナ等無機分散液20質量部を含有する主剤に、ラジカル重合開始剤2質量部、溶剤(酢酸メチル、DMC、MIBKの混合溶剤)50質量部を混合して、ハードコート層形成用塗液2を調製した。
<ハードコート層形成用塗液3:有機無機複合化合物系>
ケイ素原子1個当たり、2-(3,4エポキシ)シクロヘキシルエチル基を有するT単位を構成単位とするポリシロキサン48質量部、ラジカル重合開始剤2質量部、溶剤(酢酸エチル、MIBKの混合溶剤)50質量部を混合して、ハードコート層形成用塗液3を調製した。
<ハードコート層形成用塗液4:有機無機複合化合物系>
ケイ素原子1個当たり、2-(3,4エポキシ)シクロヘキシルエチル基を有するT単位を構成単位とするポリシロキサン48質量部、カチオン重合開始剤2質量部、溶剤(酢酸エチル、MIBKの混合溶剤)50質量部を混合して、ハードコート層形成用塗液4を調製した。
バーコーターを用いて、基材の一方面に、表1に示すハードコート層形成用塗液を硬化後のハードコート層が表1に記載の厚みとなる膜厚で塗布した。乾燥炉において40~100℃にて30~60秒間塗膜を乾燥させて溶剤を除去した。その後、紫外線を照射して塗膜を硬化させた後、100℃で2時間加熱(後加熱処理)を行い、実施例1~3に係る光学フィルムを作製した。
紫外線照射による塗膜硬化後に、後加熱処理を行わなかったことを除き、実施例1~3と同様の手順を行い、比較例1~6に係る光学フィルムを作製した。
JIS K5600(4.9N荷重)に基づき、鉛筆引っかき試験機(HA-301、テスター産業株式会社)を用いて、ハードコート層表面の鉛筆硬度を測定した。測定した鉛筆硬度が7H以上の場合に表面硬度が十分であると判定した。
屈曲性は、ユアサシステム機器株式会社製 U字型無負荷屈曲試験機を用いて評価した。80mm(流れ方向)×30mm(幅方向)にカットした光学フィルムのサンプルを測定治具に取り付け、ハードコート層を内側として20万回の繰り返し折り曲げ試験を行った。試験後、屈曲させた部分を目視及び顕微鏡で観察し、ハードコート層に外観上の変化
がなかった場合をOKとし、クラック等の破壊箇所が観察された場合をNGとした。
50mm(流れ方向)×150mm(幅方向)に光学フィルムをカットし、カットしたサンプルを、平坦な作業台上に敷いたクリーンペーパー上に載置した(図3参照)。載置したサンプルの一方の短辺の両端間の距離Aと他方の短辺の両端間の距離Bとを測定し、距離A及びBの平均値をカールの評価値とした。カールの評価値が18mm以上である場合にカールが抑制されていると判定した。尚、カールが大きく、サンプルが筒状に丸まった場合は、筒状に丸まったサンプルの直径を評価値とした。
2 樹脂フィルム
3 円偏光板
4 表示パネル
5 基材
6 ハードコート層
Claims (6)
- ポリイミドの基材上に、ハードコート層が積層された光学フィルムであって、
前記ハードコート層が、カチオン重合性の有機官能基を有するポリシロキサンの硬化膜からなり、
前記光学フィルムを、流れ方向に平行な長さ50mmの短辺と、流れ方向と直交する幅方向に平行な長さ150mmの長辺とを有する長方形にカットし、カットしたサンプルを平坦面上に載置したときに、一方の短辺の両端間の距離と他方の短辺の両端間の距離との平均値が18mm以上である、光学フィルム。 - 前記有機官能基がエポキシ基を含む、請求項1に記載の光学フィルム。
- 前記基材の厚みが20~80μmであり、
前記ハードコート層の厚みが5~30μmである、請求項1または2に記載の光学フィルム。 - 請求項1~3のいずれかに記載の光学フィルムを有するディスプレイ部材。
- 表示パネル上に、円偏光板と、請求項1~3のいずれかに記載の光学フィルムとが設けられた、ディスプレイ装置。
- 前記円偏光板と前記光学フィルムとの間に、更に、樹脂フィルムが設けられる、請求項5に記載のディスプレイ装置。
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CN202280020216.7A CN117063096A (zh) | 2021-03-16 | 2022-03-11 | 光学膜、以及使用了该光学膜的显示部件和显示装置 |
JP2023507062A JPWO2022196567A1 (ja) | 2021-03-16 | 2022-03-11 | |
KR1020237031090A KR20230142616A (ko) | 2021-03-16 | 2022-03-11 | 광학 필름, 그리고 이것을 사용한 디스플레이 부재 및 디스플레이 장치 |
US18/244,144 US20230417955A1 (en) | 2021-03-16 | 2023-09-08 | Optical film, display member and display device using the same |
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US18/244,144 Continuation US20230417955A1 (en) | 2021-03-16 | 2023-09-08 | Optical film, display member and display device using the same |
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Citations (6)
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JP2012027322A (ja) * | 2010-07-26 | 2012-02-09 | Nitto Denko Corp | 反射防止層付き円偏光板および画像表示装置 |
WO2019207957A1 (ja) * | 2018-04-26 | 2019-10-31 | 富士フイルム株式会社 | ハードコートフィルム、ハードコートフィルムを備えた物品、及び画像表示装置 |
US20200062991A1 (en) * | 2018-08-17 | 2020-02-27 | Sk Innovation Co., Ltd. | Composition for Forming Hard Coating Layer, Preparation Method of Hard Coating Film, and Hard Coating Film Prepared Using the Same |
WO2020059726A1 (ja) * | 2018-09-18 | 2020-03-26 | 富士フイルム株式会社 | ハードコート組成物、ハードコートフィルム、ハードコートフィルムを有する物品、画像表示装置、及びハードコートフィルムの製造方法 |
WO2020110966A1 (ja) * | 2018-11-27 | 2020-06-04 | 富士フイルム株式会社 | ハードコートフィルム、ハードコートフィルムを備えた物品、及び画像表示装置 |
JP2020160137A (ja) * | 2019-03-25 | 2020-10-01 | 住友化学株式会社 | 積層体及び画像表示装置 |
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JPS5881414U (ja) | 1981-11-28 | 1983-06-02 | 三菱電機株式会社 | 天井埋込形空気調和機 |
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2022
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- 2022-03-11 JP JP2023507062A patent/JPWO2022196567A1/ja active Pending
- 2022-03-11 KR KR1020237031090A patent/KR20230142616A/ko not_active Application Discontinuation
- 2022-03-11 CN CN202280020216.7A patent/CN117063096A/zh active Pending
- 2022-03-15 TW TW111109353A patent/TWI816328B/zh active
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Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2012027322A (ja) * | 2010-07-26 | 2012-02-09 | Nitto Denko Corp | 反射防止層付き円偏光板および画像表示装置 |
WO2019207957A1 (ja) * | 2018-04-26 | 2019-10-31 | 富士フイルム株式会社 | ハードコートフィルム、ハードコートフィルムを備えた物品、及び画像表示装置 |
US20200062991A1 (en) * | 2018-08-17 | 2020-02-27 | Sk Innovation Co., Ltd. | Composition for Forming Hard Coating Layer, Preparation Method of Hard Coating Film, and Hard Coating Film Prepared Using the Same |
WO2020059726A1 (ja) * | 2018-09-18 | 2020-03-26 | 富士フイルム株式会社 | ハードコート組成物、ハードコートフィルム、ハードコートフィルムを有する物品、画像表示装置、及びハードコートフィルムの製造方法 |
WO2020110966A1 (ja) * | 2018-11-27 | 2020-06-04 | 富士フイルム株式会社 | ハードコートフィルム、ハードコートフィルムを備えた物品、及び画像表示装置 |
JP2020160137A (ja) * | 2019-03-25 | 2020-10-01 | 住友化学株式会社 | 積層体及び画像表示装置 |
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KR20230142616A (ko) | 2023-10-11 |
JPWO2022196567A1 (ja) | 2022-09-22 |
TWI816328B (zh) | 2023-09-21 |
TW202238188A (zh) | 2022-10-01 |
CN117063096A (zh) | 2023-11-14 |
US20230417955A1 (en) | 2023-12-28 |
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