CN115003499A - Optical laminate and display device - Google Patents
Optical laminate and display device Download PDFInfo
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- CN115003499A CN115003499A CN202080094185.0A CN202080094185A CN115003499A CN 115003499 A CN115003499 A CN 115003499A CN 202080094185 A CN202080094185 A CN 202080094185A CN 115003499 A CN115003499 A CN 115003499A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
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- 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
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
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- 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
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Polarising Elements (AREA)
- Laminated Bodies (AREA)
- Push-Button Switches (AREA)
- Illuminated Signs And Luminous Advertising (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
- Liquid Crystal (AREA)
Abstract
本发明提供一种配置于显示装置的前表面使用的、且具有优异的耐冲击性的光学层叠体。一种光学层叠体，是将包含基材的前面板、以及n个(n为2以上的整数)光学部件依次层叠而得的，在上述n个光学部件的上述前面板侧的表面分别相接并层叠有厚度10μm以上的粘合剂层，将从靠近上述前面板的一侧起第x个(x为1～n的整数)光学部件设为第x光学部件时，评价值A满足下述式(2)：50≤A≤500(2)的关系。
The present invention provides an optical laminate which is disposed on the front surface of a display device and has excellent impact resistance. An optical laminate comprising a front panel including a base material and n (n is an integer of 2 or more) optical members sequentially stacked, wherein the surfaces of the n optical members on the front panel side are in contact with each other. When a pressure-sensitive adhesive layer having a thickness of 10 μm or more is laminated, and the x-th (x is an integer from 1 to n) optical member from the side close to the front panel is defined as the x-th optical member, the evaluation value A satisfies the following: Formula (2): The relationship of 50≤A≤500(2).
Description
Technical Field
The invention relates to an optical laminate and a display device.
Background
Korean laid-open patent publication No. 2018-0012913 (patent document 1) describes that a window for a display device is provided which has excellent durability.
Documents of the prior art
Patent document
Patent document 1: korean laid-open patent No. 2018-0012913
Disclosure of Invention
The invention aims to provide an optical laminate which is arranged on the front surface of a display device and used for the display device and has excellent impact resistance, and a display device comprising the optical laminate.
The present invention provides an optical laminate and a display device exemplified below.
[ 1] an optical laminate obtained by sequentially laminating a front plate comprising a base material and n (n is an integer of 2 or more) optical members,
the front panel side surfaces of the n optical members are respectively in contact with each other and laminated with an adhesive layer having a thickness of 10 μm or more,
when the xth optical component (x is an integer from 1 to n) from the side close to the front panel is taken as the xth optical component, the evaluation value a calculated by the following expression (1) satisfies the relationship of the following expression (2):
50≤A≤500 (2)。
[ in the formula (1), T 0 〔mJ/mm 3 A is toughness of the front panel, a 0 Is (thickness of the above base material [ μm ]/(thickness of the above front plate [ μm ])), T x 〔mJ/mm 3 Toughness of the x-th optical member, a x Is (a distance [ μm ] from a surface of the front plate on a side opposite to the optical member side to a surface of the x-th optical member on the front plate side)/(a thickness [ μm ] of the x-th optical member).]
The optical laminate according to [ 1], wherein one of the n optical members is a polarizing plate.
[ 3] the optical laminate according to [ 1] or [ 2], wherein one of the n optical members is a touch sensor panel.
[ 4] the optical laminate according to any one of [ 1] to [ 3], wherein n is an integer of 4 or less.
A display device comprising the optical laminate according to any one of [ 1] to [ 4 ].
According to the present invention, an optical laminate having excellent impact resistance and a display device including the optical laminate can be provided.
Drawings
Fig. 1 is a schematic cross-sectional view showing an example of the optical laminate of the present invention.
Detailed Description
Embodiments of the optical laminate according to the present invention will be described below with reference to the drawings, but the present invention is not limited to the embodiments below. In all the drawings below, the scale of each component is appropriately adjusted to facilitate understanding of the component, and the scale of each component shown in the drawings does not necessarily coincide with the scale of the actual component.
[ optical layered body ]
The optical laminate of the present invention is obtained by sequentially laminating a front plate including a base material and n (n is an integer of 2 or more) optical members, wherein the front plate-side surfaces of the n optical members are respectively in contact with each other and a pressure-sensitive adhesive layer having a thickness of 10 [ mu ] m or more is laminated. In the optical laminate of the present invention, the xth optical component (x is an integer of 1 to n) from the side close to the front panel is referred to as the xth optical component, and the pressure-sensitive adhesive layer having a thickness of 10 μm or more, which is laminated in contact with the front panel-side surface of the xth optical component, is referred to as the xth pressure-sensitive adhesive layer. n is preferably an integer of 6 or less, and more preferably an integer of 4 or less.
Each optical member may be composed of one layer or a plurality of layers. In the present specification, whether an optical member composed of a plurality of layers is a plurality of optical members or a single optical member is determined by the presence or absence of a pressure-sensitive adhesive layer having a thickness of 10 μm or more. In the present specification, two portions separated by an adhesive layer having a thickness of 10 μm or more are different optical members. Therefore, each optical member may include an adhesive layer having a thickness of less than 10 μm, and on the other hand, may not include an adhesive layer having a thickness of 10 μm or more.
The thickness of the optical laminate of the present invention is not particularly limited, and is, for example, 50 to 4000 μm, preferably 70 to 2000 μm, and more preferably 100 to 1000 μm, since it varies depending on the functions required for the optical laminate, the application of the optical laminate, and the like.
The optical laminate may have a square shape in plan view, for example, preferably has a square shape having long sides and short sides, and more preferably has a rectangular shape. When the shape of the optical laminate 100 in the plane direction is rectangular, the length of the long side may be, for example, 10mm to 1400mm, and preferably 50mm to 600 mm. The length of the short side is, for example, 5mm to 800mm, preferably 30mm to 500mm, and more preferably 50mm to 300 mm. Each layer constituting the optical laminate 100 may be subjected to R processing on the corners, or to slit processing on the ends, or to hole forming.
The optical laminate can be used for a display device and the like, for example. The display device is not particularly limited, and examples thereof include an organic electroluminescence (organic EL) display device, an inorganic electroluminescence (inorganic EL) display device, a liquid crystal display device, and an electroluminescence display device. The optical stack 100 is particularly suitable for use in a flexible display device.
Fig. 1 is a schematic cross-sectional view of an optical stack according to an embodiment of the present invention. The optical laminate 100 shown in fig. 1 is formed by sequentially laminating a front panel 10 and 3 (n is 3) optical members. The 3 optical members are the 1 st optical member 21, the 2 nd optical member 22, and the 3 rd optical member 23 from the side close to the front panel 10. In the optical laminate 100, the 1 st pressure-sensitive adhesive layer 31 is laminated by contacting the front surface of the 1 st optical member 21 on the side of the front panel 10, the 2 nd pressure-sensitive adhesive layer 32 is laminated by contacting the front surface of the 2 nd optical member 22 on the side of the front panel 10, and the 3 rd pressure-sensitive adhesive layer 33 is laminated by contacting the front surface of the 3 rd optical member 23 on the side of the front panel 10. The adhesive layers 31, 32, and 33 of items 1 to 3 each have a thickness of 10 μm or more.
In the optical laminate 100, the front panel 10 includes a substrate 11, and further includes a hard coat layer 12 provided on a surface of the substrate 11 on a side opposite to the 1 st optical member 21 side. For example, in the optical laminate 100, the 1 st optical member 21 is a protective plate, the 2 nd optical member 22 is a polarizing plate, and the 3 rd optical member 23 is a touch sensor panel.
< evaluation value of optical laminate A >
The evaluation value a of the optical laminate of the present invention satisfies the following formula (2):
50≤A≤500 (2)。
the evaluation value a is a value calculated by the following expression (1).
In the formula (1), T 0 〔mJ/mm 3 Toughness of the front panel, a 0 Is (thickness of substrate contained in front panel [ μm ]/[ thickness of front panel [ μm ]), T x 〔mJ/mm 3 Toughness of the x-th optical member, a x Is (distance [ μm ] from the surface of the front plate on the side opposite to the optical member side to the surface of the x-th optical member on the front plate side)/(thickness [ μm ] of the x-th optical member described above). In the present specification, toughness refers to a value measured in an environment at a temperature of 23 ℃ and a relative humidity of 55%. The toughness was measured by the method described in the examples described later.
In the optical layered body shown in fig. 1, the evaluation value a is a value calculated by the formula (1 a).
A＝T 0 /a 0 +T 1 /a 1 +T 2 /a 2 +T 3 /a 3 (1a)
In the formula (1a), the compound (A),
T 0 〔mJ/mm 3 is the toughness of the front panel 10,
a 0 is (thickness t of base material 11 included in front panel 10) 01 [ mum ]/[ thickness t of front panel 10] 0 〔μm〕)，
T 1 〔mJ/mm 3 Is as a1 the toughness of the optical member 21 is,
a 1 is (distance d from the surface of the front panel 10 on the side opposite to the optical member side to the surface of the 1 st optical member 21 on the front panel 10 side) 1 [ μm ]/[ thickness t of 1 st optical member 21 ] 1 〔μm〕)，T 2 〔mJ/mm 3 "2" is the toughness of the optical member 22,
a 2 is (distance d from the surface of the front panel 10 on the side opposite to the optical member side to the surface of the 2 nd optical member 22 on the front panel 10 side) 2 [ μm ]/[ thickness t of 2 nd optical member 22 ] 2 〔μm〕)，T 3 〔mJ/mm 3 "3" is the toughness of the optical member 23,
a 3 is (distance d from the surface of the front panel 10 on the side opposite to the optical member side to the surface of the 3 rd optical member 23 on the front panel 10 side) 3 [ μm ]/[ thickness t of 3 rd optical member 23 ] 3 〔μm〕)。
The evaluation value a is a value calculated by equation (1) derived based on the result of a preliminary test described later. According to the formula (1): the higher the toughness of the front panel, and the thicker the thickness of the front panel, the larger the value of the evaluation value a. The higher the toughness of the x-th optical member, and the thicker the thickness of the x-th optical member, the larger the value of the evaluation value a. The contribution of toughness and thickness to the evaluation value a is the largest in the front panel, and the contribution is larger in the x-th optical member arranged closer to the front panel because the distance from the front panel brings the denominator of formula (1), that is, the smaller the value of x. Therefore, the evaluation value a can be adjusted by appropriately adjusting the toughness and thickness of the front panel, the toughness and thickness of the xth optical member, the number of optical members (the value of n), the thickness of the adhesive layer, and the like. The toughness of the front panel and the toughness of the xth optical member can be adjusted by adjusting their materials.
The optical laminate of the present invention can improve impact resistance by setting the evaluation value a to 50 or more. The impact resistance of the optical laminate can be evaluated by the method described in the examples below. The optical laminate of the present invention preferably has an evaluation value a of 100 or more from the viewpoint of further improving the impact resistance.
In addition, the optical laminate of the present invention can improve the bending resistance by setting the evaluation value a to 500 or less. The optical laminate is preferably capable of being bent in a direction inward of the front panel. Bendable means bendable in a direction in which the front panel is inside. In the present specification, the term "bent" includes a bent form in which a curved surface is formed at a bent portion, and the radius of curvature of the inner surface of the bent portion is not particularly limited. In addition, the bending also includes bending in which the bending angle of the inner surface is greater than 0 ° and less than 180 °, and folding in which the bending radius of the inner surface is near zero or the bending angle of the inner surface is 0 °. The bending resistance can be evaluated by whether or not any layer of the optical laminate cracks when repeatedly bent. From the viewpoint of further improving the bending resistance, the evaluation value a of the optical laminate of the present invention is preferably 300 or less, and may be 200 or less.
< front panel >
The front panel can constitute the outermost surface of the display device. The material and thickness of the front panel are not limited as long as the front panel is a plate-like body that can transmit light. The front panel may be composed of only the base material, or may be composed of the base material and other layers, as long as the front panel includes the base material. The substrate and the other layers may be constituted of only 1 layer, or 2 or more layers. Examples of the substrate included in the front panel include a resin plate-like body (e.g., a resin plate, a resin sheet, a resin film, etc.), and a glass plate-like body (e.g., a glass plate, a glass film, etc.).
From the viewpoint of hardness, the front panel may be a resin film provided with a hard coat layer. The hard coat layer may be formed on one surface of the resin film or on both surfaces thereof. By providing the hard coat layer, hardness and scratch resistance can be improved. The hard coat layer is a cured layer of, for example, an ultraviolet curable resin. Examples of the ultraviolet curable resin include acrylic resins, silicone resins, polyester resins, urethane resins, amide resins, and epoxy resins. The hard coating may contain additives for strength. The additive is not particularly limited, and examples thereof include inorganic fine particles, organic fine particles, and a mixture thereof. When the resin film has hard coat layers on both surfaces thereof, the composition and thickness of each hard coat layer may be the same or different from each other.
The toughness of the front plate is preferably 10mJ/mm from the viewpoint of ease of formation of an optical laminate having excellent impact resistance 3 Above, more preferably 30mJ/mm 3 Above, most preferably 40mJ/mm 3 As described above. The toughness of the front panel is, for example, 100mJ/mm 3 Hereinafter, the thickness may be 60mJ/mm 3 The following. The thickness of the front plate may be, for example, 30 to 500. mu.m, preferably 40 to 200. mu.m, and more preferably 50 to 100. mu.m. The thickness of the front panel is preferably 40 μm or more from the viewpoint of ease of formation of an optical laminate having excellent impact resistance. In the present invention, the thickness of each layer constituting the optical laminate can be measured by the thickness measurement method described in the examples described below.
When the base material of the front panel is a resin plate-like body, the resin plate-like body is not limited as long as it is permeable to light. Examples of the resin constituting the plate-like body made of a resin include polymers such as triacetyl cellulose, acetyl cellulose butyrate, ethylene-vinyl acetate copolymer, propionyl cellulose, butyryl cellulose, acetyl propionyl cellulose, polyester, polystyrene, polyamide, polyetherimide, poly (meth) acrylic acid, polyimide, polyethersulfone, polysulfone, polyethylene, polypropylene, polymethylpentene, polyvinyl chloride, polyvinylidene chloride, polyvinyl alcohol, polyvinyl acetal, polyetherketone, polyetheretherketone, polyethersulfone, polymethyl methacrylate, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polycarbonate, and polyamideimide. These polymers may be used alone or in combination of 2 or more. From the viewpoint of improving strength and transparency, the resin plate-like body is preferably a resin film made of a polymer such as polyimide, polyamide, polyamideimide, or the like. The thickness of the resin plate-like body is preferably 30 μm or more, for example, 200 μm or less, from the viewpoint of ease of formation of an optical laminate having excellent impact resistance.
When the substrate of the front plate is a glass plate, a strengthened glass for display is preferably used as the glass plate. The thickness of the glass plate may be, for example, 20 to 1000. mu.m.
By using the glass plate, a front panel having excellent mechanical strength and surface hardness can be constituted.
When the optical laminate is used in a display device, the front panel may have a function of protecting the front surface (screen) of the display device (function as a window film), a function as a touch sensor, a blue light cut-off function, a viewing angle adjustment function, and the like.
< x adhesive layer >
The 1 st adhesive layer is interposed between the front panel and the 1 st optical member, and they are bonded. The x-th adhesive layer other than the 1 st adhesive layer is interposed between the x-1 st optical member and the x-th optical member, and they are bonded. The xth pressure-sensitive adhesive layer may be composed of 1 layer or 2 or more layers, preferably 1 layer, if the thickness is 10 μm or more. The 1 st to n th pressure-sensitive adhesive layers may be the same or different in composition, blending component, thickness, and the like of the pressure-sensitive adhesive composition.
The x-th pressure-sensitive adhesive layer may be composed of a pressure-sensitive adhesive composition containing a (meth) acrylic resin, a rubber-based resin, a polyurethane-based resin, an ester-based resin, a silicone-based resin, or a polyvinyl ether-based resin as a main component (base polymer). As the adhesive composition constituting the x-th adhesive layer, an adhesive composition containing a (meth) acrylic resin as a base polymer excellent in transparency, weather resistance, heat resistance and the like is suitable. The adhesive composition may be an active energy ray-curable type or a heat-curable type.
As the (meth) acrylic resin used in the adhesive composition, a polymer or copolymer in which 1 or 2 or more kinds of (meth) acrylic esters such as butyl (meth) acrylate, ethyl (meth) acrylate, isooctyl (meth) acrylate, and 2-ethylhexyl (meth) acrylate are used as monomers can be suitably used. The polar monomer is preferably copolymerized with the base polymer. Examples of the polar monomer include monomers having a carboxyl group, a hydroxyl group, an amide group, an amino group, an epoxy group, and the like, such as a (meth) acrylic acid compound, a 2-hydroxypropyl (meth) acrylate compound, a hydroxyethyl (meth) acrylate compound, a (meth) acrylamide compound, an N, N-dimethylaminoethyl (meth) acrylate compound, and a glycidyl (meth) acrylate compound.
The adhesive composition may comprise only the above-mentioned base polymer, but usually further contains a crosslinking agent. Examples of the crosslinking agent include a metal ion having a valence of 2 or more and forming a metal salt of a carboxylic acid with a carboxyl group, a polyamine compound forming an amide bond with a carboxyl group, a polyepoxy compound or polyol forming an ester bond with a carboxyl group, and a polyisocyanate compound forming an amide bond with a carboxyl group. The crosslinking agent is preferably a polyisocyanate compound.
The active energy ray-curable adhesive composition has a property of being cured by irradiation with an active energy ray such as an ultraviolet ray or an electron beam, and has a property of being capable of adhering to a coating such as a film with adhesiveness even before irradiation with an active energy ray, and of being capable of being cured by irradiation with an active energy ray to adjust the adhesion force. The active energy ray-curable adhesive composition is preferably an ultraviolet-curable adhesive composition. The active energy ray-curable adhesive composition further contains an active energy ray-polymerizable compound in addition to the base polymer and the crosslinking agent. The photopolymerization initiator, the photosensitizer and the like may be contained as necessary.
Examples of the active energy ray-polymerizable compound include (meth) acrylate monomers having at least 1 (meth) acryloyloxy group in the molecule; a (meth) acrylic compound such as a (meth) acryloyloxy group-containing compound such as a (meth) acrylate oligomer having at least 2 (meth) acryloyloxy groups in the molecule, or a compound having at least 2 benzoylphenylmethacryloyl groups in the molecule, which is obtained by reacting 2 or more functional group-containing compounds. The binder composition may contain the active energy ray-polymerizable compound in an amount of 0.1 part by mass or more and 10 parts by mass or less, 5 parts by mass or less, or 2 parts by mass or less based on 100 parts by mass of the solid content of the binder composition.
Benzoylphenylmethacryloyl refers to a group represented by the following structure. Denotes the bonding site. The number of benzoylphenylmethacryloyl groups contained in the molecule of the active energy ray-polymerizable compound may be 5 or less and 4 or less.
Examples of the compound having at least 2 benzoylphenylmethacryloyl groups in the molecule include the following compounds.
Examples of the photopolymerization initiator include benzophenone, benzildimethylketal, and 1-hydroxycyclohexylphenylketone. The photopolymerization initiator may contain 1 or 2 or more species. When the pressure-sensitive adhesive composition contains a photopolymerization initiator, the total content thereof may be, for example, 0.01 to 3.0 parts by mass per 100 parts by mass of the solid content of the pressure-sensitive adhesive composition.
The binder composition may contain additives such as fine particles, beads (resin beads, glass beads, and the like), glass fibers, resins other than the base polymer for imparting light scattering properties, adhesion imparting agents, fillers (metal powder, other inorganic powder, and the like), antioxidants, ultraviolet absorbers, dyes, pigments, colorants, antifoaming agents, anticorrosive agents, photopolymerization initiators, and the like.
The xth pressure-sensitive adhesive layer can be formed by applying a diluted solution of the above pressure-sensitive adhesive composition in an organic solvent to a substrate and drying the applied solution. The xth adhesive layer may also be formed using an adhesive sheet formed using an adhesive composition. In the case of using an active energy ray-curable adhesive composition, the adhesive layer having a desired degree of curing can be obtained by irradiating the formed adhesive layer with an active energy ray.
The thickness of the xth pressure-sensitive adhesive layer is 10 μm or more, preferably 100 μm or less, and more preferably 50 μm or less.
< optical component >
Examples of the optical member in the optical laminate include a protective plate, a polarizing plate, a touch sensor panel, and the like included in the optical laminate 100 shown in fig. 1, and a back plate and the like. Examples of the back panel include a touch sensor panel and an organic EL display device. When the optical member is composed of a plurality of layers, a bonding layer for bonding two layers may be included. Examples of the order of stacking the optical members in the optical layered body include a protective plate, a polarizing plate, and a touch sensor panel from the front panel side (the stacking order shown in fig. 1), a protective plate, a polarizing plate, a touch sensor panel, an organic EL display element, a protective plate, a touch sensor panel, a polarizing plate, and an organic EL display element. The polarizing plate in the lamination order shown here is preferably a circular polarizing plate in terms of being able to impart a function as an antireflection film to the optical laminate. The protective plate in the lamination order shown here may not be included, but is preferably included from the viewpoint of easily adjusting the evaluation value a to a desired value.
Polarizing plate
The polarizing plate may be, for example, a linear polarizing plate, a circular polarizing plate (including an elliptical polarizing plate), or the like. The circular polarizing plate is provided with a linear polarizing plate and a phase difference layer. Since the circularly polarizing plate can absorb external light reflected by the image display device, the optical laminate can be provided with a function as an antireflection film.
The toughness of the polarizing plate is preferably 1mJ/mm from the viewpoint of ease of formation of an optical laminate having excellent impact resistance 3 The above is more preferably 2mJ/mm 3 As described above. The toughness of the polarizing plate is, for example, 100mJ/mm 3 Below, it may be 50mJ/mm 3 Hereinafter, it may be 10mJ/mm 3 The following. The thickness of the polarizing plate is usually 5 μm or more, and may be 20 μm or more, 25 μm or more, or 30 μm or more. The thickness of the polarizing plate is preferably 80 μm or less, and more preferably 60 μm or less.
Linear polarizer
The linearly polarizing plate has a function of selectively transmitting linearly polarized light in one direction of unpolarized light rays such as natural light. The linearly polarizing plate may include, as the polarizer layer, a stretched film or a stretched layer having a dichroic dye adsorbed thereon, a liquid crystal layer containing a cured product of a polymerizable liquid crystal compound and a dichroic dye, the dichroic dye being dispersed and oriented in the cured product of the polymerizable liquid crystal compound, or the like. The dichroic dye is a dye having a property that the absorbance of molecules in the long axis direction is different from the absorbance of molecules in the short axis direction. The linearly polarizing plate using a liquid crystal layer as a polarizer layer is preferable because the bending direction is not limited as compared with a stretched film or a stretched layer having a dichroic dye adsorbed thereon.
(polarizer layer as stretched film or stretched layer having dichroic dye adsorbed thereon)
The polarizer layer as a stretched film having a dichroic dye adsorbed thereon can be usually produced through a step of uniaxially stretching a polyvinyl alcohol resin film, a step of adsorbing the dichroic dye by dyeing the polyvinyl alcohol resin film with a dichroic dye such as iodine, a step of treating the polyvinyl alcohol resin film having the dichroic dye adsorbed thereon with an aqueous boric acid solution, and a step of washing the polyvinyl alcohol resin film with water after the treatment with the aqueous boric acid solution.
The thickness of the polarizer layer is usually 30 μm or less, preferably 18 μm or less, and more preferably 15 μm or less. Making the thickness of the polarizer layer thin is advantageous for making the polarizing plate 103 thin. The thickness of the polarizer layer is usually 1 μm or more, and for example, may be 5 μm or more.
The polyvinyl alcohol resin is obtained by saponifying a polyvinyl acetate resin. As the polyvinyl acetate-based resin, in addition to polyvinyl acetate which is a homopolymer of vinyl acetate, a copolymer of vinyl acetate and another monomer copolymerizable therewith may be used. Examples of the other monomer copolymerizable with vinyl acetate include unsaturated carboxylic acid compounds, olefin compounds, vinyl ether compounds, unsaturated sulfone compounds, and (meth) acrylamide compounds having an ammonium group.
The saponification degree of the polyvinyl alcohol resin is usually about 85 mol% to 100 mol%, and preferably 98 mol% or more. The polyvinyl alcohol resin may be modified, and polyvinyl formal, polyvinyl acetal, or the like modified with aldehydes may be used. The polymerization degree of the polyvinyl alcohol resin is usually 1000 to 10000, preferably 1500 to 5000.
The polarizer layer as the stretched layer having the dichroic dye adsorbed thereon can be generally produced through a step of applying a coating liquid containing the above-mentioned polyvinyl alcohol resin onto a base film, a step of uniaxially stretching the obtained laminated film, a step of dyeing the polyvinyl alcohol resin layer of the uniaxially stretched laminated film with the dichroic dye to adsorb the dichroic dye thereon to produce a polarizer layer, a step of treating the film having the dichroic dye adsorbed thereon with an aqueous boric acid solution, and a step of washing with water after the treatment with the aqueous boric acid solution. The substrate film for forming the polarizer layer may also be used as a protective layer for the polarizer layer. The substrate film may be peeled off from the polarizer layer as necessary. The material and thickness of the base film may be the same as those of the thermoplastic resin film described later.
The polarizer layer as a stretched film or a stretched layer having a dichroic dye adsorbed thereon may be used as it is as a linear polarizing plate, or may be used as a linear polarizing plate by forming a protective layer on one or both surfaces thereof. As the protective layer, a thermoplastic resin film described later can be used. The thickness of the obtained linear polarizer is preferably 2 to 40 μm.
Examples of the thermoplastic resin film include a cyclic polyolefin resin film; cellulose acetate resin films made of resins such as triacetyl cellulose and diacetyl cellulose; polyester resin films made of resins such as polyethylene terephthalate, polyethylene naphthalate, and polybutylene terephthalate; a polycarbonate-based resin film; a (meth) acrylic resin film; and films known in the art, such as polypropylene resin films. The polarizer layer and the protective layer may be laminated via a lamination layer described later.
From the viewpoint of thinning, the thickness of the thermoplastic resin film is usually 100 μm or less, preferably 80 μm or less, more preferably 60 μm or less, further preferably 40 μm or less, further preferably 30 μm or less, and usually 5 μm or more, preferably 10 μm or more.
A hard coat layer may also be formed on the thermoplastic resin film. The hard coat layer may be formed on one surface or both surfaces of the thermoplastic resin film. By providing the hard coat layer, a thermoplastic resin film having improved hardness and scratch resistance can be produced. The hard coat layer may be formed in the same manner as the hard coat layer formed on the resin film.
(polarizer layer as liquid Crystal layer)
The polymerizable liquid crystal compound used for forming the liquid crystal layer is a compound having a polymerizable reactive group and exhibiting liquid crystallinity. The polymerizable reactive group is a group participating in polymerization reaction, and is preferably a photopolymerizable reactive group. The photopolymerizable reactive group means a group that can participate in a polymerization reaction by an active radical, an acid, or the like generated from a photopolymerization initiator. Examples of the photopolymerizable functional group include a vinyl group, a vinyloxy group, a 1-chloroethenyl group, an isopropenyl group, a 4-vinylphenyl group, an acryloyloxy group, a methacryloyloxy group, an oxetanyl group, and an oxetanyl group. Among them, acryloxy, methacryloxy, vinyloxy, oxetanyl and oxetanyl groups are preferable, and acryloxy group is more preferable. The type of the polymerizable liquid crystal compound is not particularly limited, and a rod-like liquid crystal compound, a discotic liquid crystal compound, and a mixture thereof can be used. The liquid crystallinity of the polymerizable liquid crystal compound may be thermotropic liquid crystal or lyotropic liquid crystal, and the phase-sequence structure may be nematic liquid crystal or smectic liquid crystal.
The dichroic dye used for the polarizer layer as a liquid crystal layer preferably has a maximum absorption wavelength (λ MAX) in the range of 300 to 700 nm. Examples of such dichroic dyes include acridine dyes,
Oxazine pigments, cyanine pigments, naphthalene pigments, azo pigments, anthraquinone pigments, and the like, and among them, azo pigments are preferable. As azo-sExamples of the coloring matter include monoazo coloring matter, disazo coloring matter, trisazo coloring matter, tetraazo coloring matter, and stilbene azo coloring matter, and disazo coloring matter and trisazo coloring matter are preferable. The dichroic dye may be used alone or in combination of 2 or more, preferably 3 or more. In particular, a combination of 3 or more azo compounds is more preferable. A part of the dichroic dye may have a reactive group or may have liquid crystallinity.
The polarizer layer as the liquid crystal layer can be formed, for example, by applying a composition for forming a polarizer layer containing a polymerizable liquid crystal compound and a dichroic dye onto an alignment film formed on a base film, and polymerizing and curing the polymerizable liquid crystal compound. The composition for forming a polarizer layer may be applied to a base film to form a coating film, and the coating film may be stretched together with the base film to form a polarizer layer. The substrate film for forming the polarizer layer may also be used as a protective layer for the polarizer layer. The material and thickness of the base film may be the same as those of the thermoplastic resin film.
Examples of the composition for forming a polarizer layer containing a polymerizable liquid crystal compound and a dichroic dye and the method for producing a polarizer layer using the composition include those described in japanese patent application laid-open nos. 2013-37353, 2013-33249, and 2017-83843. The composition for forming a polarizer layer may further contain additives such as a solvent, a polymerization initiator, a crosslinking agent, a leveling agent, an antioxidant, a plasticizer, and a sensitizer in addition to the polymerizable liquid crystal compound and the dichroic dye. These components may be used alone in 1 kind, or 2 or more kinds may be used in combination.
The polymerization initiator that the composition for forming a polarizer layer may contain is a compound that can initiate a polymerization reaction of the polymerizable liquid crystal compound, and is preferably a photopolymerization initiator in that the polymerization reaction can be initiated at a lower temperature. Specifically, there may be mentioned photopolymerization initiators capable of generating active radicals or acids by the action of light, and among them, photopolymerization initiators capable of generating radicals by the action of light are preferred. The content of the polymerization initiator is preferably 1 to 10 parts by mass, and more preferably 3 to 8 parts by mass, based on 100 parts by mass of the total amount of the polymerizable liquid crystal compound. Within this range, the reaction of the polymerizable group proceeds sufficiently, and the alignment state of the liquid crystal compound is easily stabilized.
The thickness of the polarizer layer as the liquid crystal layer is usually 10 μm or less, preferably 0.5 to 8 μm, and more preferably 1 to 5 μm.
The polarizer layer as the liquid crystal layer may be used as a linear polarizer without peeling and removing the substrate film, or the substrate film may be peeled and removed from the polarizer layer to be used as a linear polarizer. The polarizer layer as the liquid crystal layer may be used as a linear polarizer by forming a protective layer on one or both surfaces thereof. As the protective layer, the above thermoplastic resin film can be used.
The polarizer layer as the liquid crystal layer may have an overcoat layer on one side or both sides of the polarizer layer for the purpose of protecting the polarizer layer and the like. The overcoat layer can be formed, for example, by coating the material (composition) for forming the overcoat layer on the polarizer layer. Examples of the material constituting the overcoat layer include a photocurable resin and a water-soluble polymer. As a material constituting the overcoat layer, a (meth) acrylic resin, a polyvinyl alcohol resin, or the like can be used.
(retardation layer)
The retardation layer included in the polarizing plate may be 1 layer or 2 or more layers. The retardation layer is preferably laminated on the surface of the polarizer layer on the side opposite to the front panel side. The retardation layer may have an overcoat layer for protecting the surface thereof, a substrate film for supporting the retardation layer, and the like. The phase difference layer includes a λ/4 layer, and may further include at least either a λ/2 layer or a positive C layer. When the retardation layer includes a lambda/2 layer, the lambda/2 layer and the lambda/4 layer are stacked in this order from the linear polarizer side. When the retardation layer includes a positive C layer, the λ/4 layer and the positive C layer may be stacked in this order from the linear polarizer side, or the positive C layer and the λ/4 layer may be stacked in this order from the linear polarizer side. The thickness of the retardation layer is, for example, 0.1 to 10 μm, preferably 0.5 to 8 μm, and more preferably 1 to 6 μm.
The retardation layer may be formed of a resin film exemplified as a material of the protective layer, or may be formed of a layer obtained by curing a polymerizable liquid crystal compound. The retardation layer may further include an alignment film. The phase difference layer may have a lamination layer for laminating the λ/4 layer with the λ/2 layer and the positive C layer.
When the polymerizable liquid crystal compound is cured to form the retardation layer, the retardation layer can be formed by applying a composition containing the polymerizable liquid crystal compound to a substrate film and curing the composition. An alignment film may be formed between the substrate film and the coating layer. The material and thickness of the base film may be the same as those of the thermoplastic resin film described above. When the retardation layer is formed from a layer obtained by curing a polymerizable liquid crystal compound, the retardation layer may be incorporated into the optical laminate in a form having an alignment film and a base film. The retardation layer may be bonded to the linearly polarizing plate via a bonding layer.
Touch sensor panel
The touch sensor panel may be a sensor that can detect a position touched on the front panel, and may have a transparent conductive layer. The touch sensor panel may have a substrate supporting the transparent conductive layer in addition to the transparent conductive layer. The detection method is not limited, and touch sensor panels such as a resistive film method, a capacitive method, an optical sensor method, an ultrasonic method, an electromagnetic induction coupling method, and a surface acoustic wave method can be exemplified. Among them, the touch sensor panel using the electrostatic capacitance method is suitable for low cost, high response speed, and thin film. The touch sensor panel may include an adhesive layer, a separation layer, a protective layer, and the like between the transparent conductive layer and a base material supporting the transparent conductive layer. Examples of the adhesive layer include an adhesive layer and an adhesive layer. Examples of the substrate supporting the transparent conductive layer include a substrate having a transparent conductive layer formed on one surface by vapor deposition, a substrate having a transparent conductive layer transferred thereto via an adhesive layer, and the like.
An example of a capacitive touch sensor panel includes a base material, a position detection transparent conductive layer provided on a surface of the base material, and a touch position detection circuit. In a display device provided with an optical laminate having a capacitive touch sensor panel, when the surface of a front panel is touched, a transparent conductive layer is grounded at the touched point via the capacitance of a human body. The touch position detection circuit detects grounding of the transparent conductive layer, thereby detecting a touched position. By having a plurality of transparent conductive layers separated from each other, more detailed position detection can be achieved.
The transparent conductive layer may be a transparent conductive layer made of a metal oxide such as ITO, or may be a metal layer made of a metal such as aluminum, copper, silver, gold, or an alloy thereof.
The separation layer may be a layer which is formed over a substrate such as glass and which is used to separate a transparent conductive layer formed over the separation layer from the substrate together with the separation layer. The separation layer is preferably an inorganic layer or an organic layer. Examples of the material for forming the inorganic layer include silicon oxide. As a material for forming the organic layer, for example, a (meth) acrylic resin composition, an epoxy resin composition, a polyimide resin composition, or the like can be used.
The protective layer may be provided in contact with the transparent conductive layer for protecting the conductive layer. The protective layer includes at least one of an organic insulating film and an inorganic insulating film, and these films can be formed by spin coating, sputtering, vapor deposition, or the like.
The touch sensor panel 30 can be manufactured, for example, as follows. In the method 1, first, a base material is laminated on a glass substrate via an adhesive layer. A transparent conductive layer patterned by photolithography is formed on a substrate. The glass substrate and the base material are separated by heating, and a touch sensor panel composed of the transparent conductive layer and the base material is obtained.
In the method 2, a separation layer is first formed on a glass substrate, and a protective layer is formed on the separation layer as needed. A transparent conductive layer patterned by photolithography is formed on the separation layer (or the protective layer). A protective film which can be peeled is laminated on the transparent conductive layer, and the glass substrate is separated by transferring the protective film from the transparent conductive layer to the separation layer. The substrate and the separation layer are bonded to each other through the adhesive layer, and the peelable protective film is peeled off, thereby obtaining a touch sensor panel having the transparent conductive layer, the separation layer, the adhesive layer, and the substrate in this order.
Examples of the substrate of the touch sensor panel include resin films such as triacetyl cellulose, polyethylene terephthalate, cycloolefin polymer, polyethylene naphthalate, polyolefin, polycycloolefin, polycarbonate, polyethersulfone, polyarylate, polyimide, polyamide, polystyrene, and polynorbornene. From the viewpoint of easily constituting a substrate layer having desired toughness, polyethylene terephthalate is preferably used.
The toughness of the touch sensor panel is preferably 2mJ/mm from the viewpoint of ease of formation of an optical laminate having excellent impact resistance 3 Above, more preferably 10mJ/mm 3 Above, most preferably 50mJ/mm 3 The above. Toughness of touch sensor panel is 200mJ/mm, for example 3 The following.
The thickness of the touch sensor panel is preferably 30 μm or more from the viewpoint of ease of formation of an optical laminate having excellent impact resistance. The thickness of the touch sensor panel is, for example, 100 μm or less.
Back plate
As the back plate, a plate-like body that transmits light, a component used in a general display device, or the like can be used.
The thickness of the back plate may be, for example, 5 to 2000. mu.m, preferably 10 to 1000. mu.m, and more preferably 15 to 500. mu.m.
The plate-like body used for the back plate may be composed of only 1 layer or 2 or more layers, and the plate-like body described above for the front plate may be used.
Examples of the components used in a general display device used for the back panel include the touch sensor panel and the organic EL display element described above.
Protection plate
As the protective plate, a plate-like body made of a resin which transmits light, a component used in a general display device, or the like can be used. The resin plate-like body may be constituted of only 1 layer or 2 or more layers, and the resin plate-like body described in the front panel can be used as exemplified above. Examples of the resin constituting the protective plate include polymers such as triacetyl cellulose, acetyl cellulose butyrate, ethylene-vinyl acetate copolymer, propionyl cellulose, butyryl cellulose, levulinyl cellulose, polyester, polystyrene, polyamide, polyetherimide, poly (meth) acrylic acid, polyimide, polyethersulfone, polysulfone, polyethylene, polypropylene, polymethylpentene, polyvinyl chloride, polyvinylidene chloride, polyvinyl alcohol, polyvinyl acetal, polyetherketone, polyetheretherketone, polyethersulfone, polymethylmethacrylate, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polycarbonate, and polyamideimide. These polymers may be used alone or in combination of 2 or more.
The toughness of the protective plate is preferably 1mJ/mm from the viewpoint of ease of formation of an optical laminate having excellent impact resistance 3 Above, more preferably 4mJ/mm 3 Above, it may be 50mJ/mm 3 As described above. The toughness of the protective plate is, for example, 200mJ/mm 3 Hereinafter, the thickness may be 100mJ/mm 3 The following. The thickness of the protective plate may be, for example, 5 to 2000. mu.m, preferably 10 to 1000. mu.m, more preferably 15 to 500. mu.m, and still more preferably 30 to 100. mu.m.
(laminating layer)
The optical component may comprise a lamination layer for joining the 2 layers. The adhesive layer is a layer made of an adhesive or a bonding agent. When the attaching layer is an adhesive layer, the thickness of the attaching layer is less than 10 μm. As the adhesive for the material of the laminating layer, the adhesive composition described in the above-mentioned x-th adhesive layer can be used.
The adhesive used as the material of the adhesive layer may be formed by combining 1 or 2 or more kinds of water-based adhesives, active energy ray-curable adhesives, and the like, for example. Examples of the aqueous adhesive include a polyvinyl alcohol resin aqueous solution and an aqueous two-pack polyurethane emulsion adhesive. The active energy ray-curable adhesive is an adhesive that is cured by irradiation with an active energy ray such as ultraviolet ray, and examples thereof include an adhesive containing a polymerizable compound and a photopolymerization initiator, an adhesive containing a photoreactive resin, and an adhesive containing a binder resin and a photoreactive crosslinking agent. Examples of the polymerizable compound include photopolymerizable monomers such as a photocurable epoxy monomer, a photocurable acrylic monomer, and a photocurable urethane monomer, and oligomers derived from these monomers. Examples of the photopolymerization initiator include compounds containing active species that generate neutral radicals, anionic radicals, and cationic radicals by irradiation with active energy rays such as ultraviolet rays.
The thickness of the adhesive layer may be, for example, 1 μm or more, preferably 1 μm or more and less than 10 μm, more preferably 2 μm or more and less than 10 μm, and still more preferably 2.5 μm to 5 μm.
The two opposing surfaces bonded via the bonding layer may be subjected to corona treatment, plasma treatment, flame treatment, or the like in advance, or may have a primer layer or the like.
[ method for producing optical laminate ]
The optical laminate can be produced by a method including a step of bonding the front panel and the optical member via the adhesive layer. The surfaces of the front plate and the optical member that are in contact with the pressure-sensitive adhesive layer are preferably subjected to surface activation treatment such as corona treatment for adjusting the adhesion force. The conditions of the corona treatment may be set as appropriate, and may be different between one surface and the other surface of the mating surface. When the bonding surface is a transparent conductive layer of the touch sensor panel, it is preferable not to perform corona treatment.
< display device >
The display device included in the present invention includes the optical laminate of the present invention. The display device is not particularly limited, and examples thereof include image display devices such as an organic EL display device, an inorganic EL display device, a liquid crystal display device, and an electroluminescence display device. A display device including the optical laminate of the present invention has excellent impact resistance, and can also be used as a flexible display which can be bent or rolled.
In the display device, the optical laminate is disposed on the viewing side of the display element included in the display device with the front panel facing outward (the side opposite to the display element side, i.e., the viewing side). The display device is preferably bendable with the front panel side being the inside. The display device may be curved so that the front panel side is the outer side.
The display device of the invention can be used as a portable device such as a smart phone and a tablet, a television, a digital photo frame, an electronic billboard, a detector, a meter, an office device, a medical instrument, a computer device and the like.
Examples
The present invention will be described in more detail below with reference to examples, but the present invention is not limited thereto.
< preliminary test >
In each of tests 1 to 5, 3 test pieces (for example, test pieces 1-1, 1-2, and 1-3 in test 1) were prepared. Each test piece had the configuration of the optical laminate 100 shown in fig. 1, and the front panel 10 and the 1 st to 3 rd optical members 21, 22, and 23 were configured using the members shown in table 1. In each test piece, adhesive layers (thickness: 25 μm) prepared as described below were used for the 1 st to 3 rd adhesive layers 31, 32, and 33. In test 1, the members of the front panel were different among 3 test pieces, in test 2, the members of the 1 st optical member were different among 3 test pieces, in test 3, the members of the 2 nd optical member were different among 3 test pieces, in test 4, the 3 rd optical member was different among 3 test pieces, and in test 5, the front panel and the 1 st to 3 rd optical members were different among 3 test pieces. The impact resistance test was performed on each test piece in accordance with the method described below, and the depth of the impact mark was measured. The measurement results are shown in table 1.
[ Table 1]
In table 1, members 1, 2, and 3 are resin films shown in table 2. In table 2, the toughness and thickness of the members 1, 2, and 3 were measured by the methods described later.
[ Table 2]
| Species of | Thickness [ mu ] m] | Toughness [ mJ/mm 3 ] | |
| Component 1 | Cycloolefin polymer film | 25 | 1 |
| Component 2 | Triacetyl cellulose film | 25 | 10 |
| Component 3 | Polyethylene terephthalate film | 25 | 100 |
[ preparation of adhesive layer ]
The (meth) acrylic resin used for the adhesive for forming the adhesive layer was prepared according to the following procedure. A 1L reaction vessel capable of refluxing nitrogen gas and provided with a cooling device for temperature adjustment was charged with 95 parts of 2-ethylhexyl acrylate, 2 parts of dodecyl acrylate, and 3 parts of 2-hydroxypropyl acrylate. To remove oxygen from the reaction vessel, the internal temperature was maintained at 60 ℃ by purging with nitrogen for 1 hour. After the compounds charged into the reaction vessel were mixed uniformly, 0.5 part of 1-hydroxycyclohexyl phenyl ketone as a photopolymerization initiator was charged and stirred, and a UV lamp (10mW) was irradiated to obtain a (meth) acrylic resin. The weight average molecular weight Mw of the obtained (meth) acrylic resin was 61 ten thousand.
An adhesive was obtained by mixing 100 parts of the (meth) acrylic resin (solid content equivalent) obtained above and 0.3 part of 1-hydroxycyclohexylphenone (solid content equivalent) as a photopolymerization initiator.
The obtained adhesive was applied to the silicone release-treated surface of the 1 st release film, which was a PET film, as a substrate, to a thickness of 25 μm, and the 2 nd release film, which was a PET film, as a substrate, was laminated on the coating layer to prepare a laminate. The laminate was subjected to UV irradiation (cumulative light amount 400 mJ/cm) 2 Illuminance of 1.8mW/cm 2 UVV standard), a 1 st release film, an adhesive layer, and a 2 nd release film were laminated in this order to prepare an adhesive sheet.
[ measurement of toughness ]
The toughness of the optical member was measured in accordance with JIS K7161 as follows. Rectangular chips with a long side of 110mm × a short side of 10mm were cut out from the optical component to be measured by using a super cutter. Then, both ends in the longitudinal direction of the chip were held at a distance of 5cm by upper and lower clamps of a tensile tester (Autograph AG-Xplus tester manufactured by Shimadzu corporation), and the chip was stretched in the longitudinal direction at a stretching speed of 4 mm/min under an environment of 23 ℃ and 55% relative humidity. Toughness was calculated as an integrated value of a stress-strain curve during a period from an initial stage to fracture.
[ impact resistance test ]
Rectangular pieces having a length of 150mm × 70mm were cut out from the optical laminate to be measured using a super cutter, and the surface of the piece opposite to the front panel was bonded to an acrylic plate via an adhesive layer. Then, the evaluation pen was held on the small piece in an environment of 23 ℃ and 55% relative humidity such that the pen tip was positioned at a height of 10cm from the outermost surface of the front plate of the small piece and the pen tip was downward, and the evaluation pen was dropped from this position. As the evaluation pen, a pen having a weight of 5.6g and a pen tip diameter of 0.75mm was used. The depth of the mark was measured using an image of an interference Microscope (ContourGT-K3D Optical Microscope, Bruker) on the chip after the evaluation pen was dropped.
[ measurement of thickness ]
The thickness of the sample was measured using a contact type film thickness measuring apparatus ("MS-5C" manufactured by Nikon K.K.). The polarizer layer and the alignment film were measured using a laser microscope ("OLS 3000" manufactured by olympus corporation).
[ examination of preliminary test results ]
From the evaluation results of the test 1 to 5 shown in table 1, it is found that: in the impact resistance test, the optical member closer to the surface on which the pen collides has a greater influence on the depth of the impact mark due to the use of different types (different toughness) of base materials, and the impact depth can be reduced as the toughness of the optical member is increased.
< examples 1 to 5, comparative examples 1 and 2 >
As the optical laminates of examples 1 to 5 and comparative examples 1 and 2, an optical laminate 100 shown in fig. 1 was produced. In each optical laminate, the front panel 10, the 1 st optical member (protective plate) 21, the 2 nd optical member (polarizing plate) 22, and the 3 rd optical member (touch sensor panel) 23 are configured using members described later. In each of the optical laminates, the same adhesive layers (thickness: 25 μm) as those of the 1 st to 3 rd adhesive layers 31, 32 and 33 used in the preliminary test were used for the 1 st to 3 rd adhesive layers 31, 32 and 33. For each optical layered body, an evaluation value a is calculated from the formula (1 a). The calculated evaluation value a is shown in table 3.
Each optical laminate was subjected to an impact resistance test by the method shown in the section of the preliminary test, and the scratch was evaluated by visual observation and observation under a microscope (Nikon, MM-40/2U, X10 magnification) according to the following evaluation criteria. The evaluation results are shown in table 3.
A: in the observation by eye and microscope, no mark was observed.
B: in the visual observation, no mark was observed. In observation by a microscope, the marking was observed.
C: in the visual observation, the mark was observed.
[ front panel 10]
A front plate (177 mm in length by 105mm in width) having a hard coat layer 12 formed on one surface thereof was produced by applying the composition for a hard coat layer on a transparent resin film (substrate 11), drying the composition with a solvent, and UV-curing the dried composition.
The composition for a hard coat layer was prepared by mixing 30 parts by weight of a multifunctional acrylate (MIRAMER M340, U.S. Pat. No.), 50 parts by weight of a nano silica sol (average particle diameter 12nm, solid content 40%) dispersed in propylene glycol monomethyl ether, 17 parts by weight of ethyl acetate, 2.7 parts by weight of a photopolymerization initiator (Ciba, I184), and 0.3 part by weight of a fluorine-based additive (KY 1203, shin-Etsu chemical Co., Ltd.) with a stirrer and filtering the mixture with a polypropylene (PP) filter.
The resin film (substrate 11) used was the polyamideimide resin film of any one of the following production examples 1 to 7 shown in Table 3.
Production example 1
52g (162.38mmol) of 2, 2' -bis (trifluoromethyl) benzidine (TFMB) and 673.93g of N, N-dimethylacetamide (DMAc) having a water content of 500ppm were charged into a 1L separable flask equipped with a stirring blade under a nitrogen atmosphere, and TFMB was dissolved in DMAc while stirring at room temperature. Subsequently, 28.90g (65.05mmol) of 4, 4' - (hexafluoroisopropylidene) diphthalic dianhydride (6FDA) was added to the flask, and the mixture was stirred at room temperature for 3 hours. Thereafter, 19.81g (97.57mmol) of terephthaloyl chloride (TPC) was added to the flask, and the mixture was stirred at room temperature for 1 hour. Subsequently, 7.49g (94.65mmol) of pyridine and 14.61g (143.11mmol) of acetic anhydride were added to the flask, and the mixture was stirred at room temperature for 30 minutes, then heated to 70 ℃ using an oil bath, and further stirred for 5 hours, whereby a reaction solution was obtained.
The obtained reaction solution was cooled to room temperature, and put into a large amount of methanol in a linear form, and the precipitated precipitate was taken out, immersed in methanol for 6 hours, and then washed with methanol. Then, the precipitate was dried under reduced pressure at 100 ℃ to obtain a polyamideimide resin. DMAc was added to the obtained polyamideimide resin so that the concentration thereof was 15% by mass, thereby producing a polyamideimide varnish.
The obtained polyamide-imide varnish was applied to a smooth surface of a polyester substrate (manufactured by Toyobo Co., Ltd., trade name "A4100") using a coater so that the film thickness of the self-supporting film was 55 μm, and the film was dried at 50 ℃ for 30 minutes and then at 140 ℃ for 15 minutes to obtain a self-supporting film. The free-standing film was fixed to a metal frame, and further dried at 230 ℃ for 30 minutes under the air to obtain a polyamide-imide film having a film thickness of 50 μm.
Production example 2
A polyamideimide film having a film thickness of 60 μm was obtained in the same manner as in production example 1, except that the film thickness of the free-standing film was 65 μm.
Production example 3
52g (162.38mmol) of 2, 2' -bis (trifluoromethyl) benzidine (TFMB) and 693.8g of N, N-dimethylacetamide (DMAc) having a water content of 100ppm were charged into a 1L separable flask equipped with a stirring blade under a nitrogen atmosphere, and TFMB was dissolved in DMAc while stirring at room temperature. Subsequently, 28.90g (65.05mmol) of 4,4 ' - (hexafluoroisopropylidene) diphthalic dianhydride (6FDA) and 9.57g (32.52mmol) of 3,3 ', 4,4 ' -biphenyltetracarboxylic dianhydride (BPDA) were added to the flask, and the mixture was stirred at room temperature for 3 hours. Thereafter, 13.21g (63.10mmol) of terephthaloyl chloride (TPC) was added to the flask, and stirred at room temperature for 1 hour. Subsequently, 4.99g (63.10mmol) of pyridine and 21.91g (214.66mmol) of acetic anhydride were added to the flask, and the mixture was stirred at room temperature for 30 minutes, then heated to 70 ℃ using an oil bath, and further stirred for 1 hour, whereby a reaction solution was obtained.
The obtained reaction solution was cooled to room temperature, put into a large amount of methanol in a linear form, and the precipitated precipitate was taken out, immersed in methanol for 6 hours, and then washed with methanol. Then, the precipitate was dried under reduced pressure at 100 ℃ to obtain a polyamideimide resin. DMAc was added to the obtained polyamideimide resin so that the concentration thereof was 15% by mass, thereby producing a polyamideimide varnish.
The obtained polyamide-imide varnish was applied to a smooth surface of a polyester substrate (manufactured by Toyobo Co., Ltd., trade name "A4100") using a coater so that the film thickness of the self-supporting film was 55 μm, and the film was dried at 50 ℃ for 30 minutes and then at 140 ℃ for 15 minutes to obtain a self-supporting film. The free-standing film was fixed to a metal frame, and further dried at 300 ℃ for 30 minutes under the air to obtain a polyamide-imide film having a film thickness of 50 μm.
Production example 4
A polyamideimide film having a film thickness of 60 μm was obtained in the same manner as in production example 3, except that the film thickness of the free-standing film was 65 μm.
Production example 5
A polyamideimide film having a film thickness of 40 μm was obtained in the same manner as in production example 3, except that the film thickness of the free-standing film was 45 μm.
Production example 6
14.67g (45.8mmol) of 2, 2' -bis (trifluoromethyl) benzidine (TFMB) and 233.3g of N, N-dimethylacetamide (DMAc) with a water content of 200ppm were charged into a 1L separable flask equipped with a stirring blade under a nitrogen atmosphere, and TFMB was dissolved in DMAc while stirring at room temperature. Next, 4.283g (13.8mmol) of 4, 4' -oxydiphthalic dianhydride (OPDA) was added to the flask, and the mixture was stirred at room temperature for 16.5 hours. Thereafter, 1.359g (4.61mmol) of 4, 4' -oxybis (benzoyl chloride) (OBBC) and 5.609g (27.6mmol) of terephthaloyl chloride (TPC) were added to the flask, and stirred at room temperature for 1 hour. Subsequently, 4.937g (48.35mmol) of acetic anhydride and 1.501g (16.12mmol) of 4-methylpyridine were added to the flask, and the mixture was stirred at room temperature for 30 minutes, then heated to 70 ℃ using an oil bath, and further stirred for 3 hours, thereby obtaining a reaction solution. After the obtained reaction solution was cooled to room temperature, 360g of methanol and 170g of ion-exchanged water were added to the reaction solution to obtain a precipitate of polyamideimide. It was immersed in methanol for 12 hours, recovered by filtration, and washed with methanol. Then, the precipitate was dried under reduced pressure at 100 ℃ to obtain a polyamideimide resin. DMAc was added to the obtained polyamideimide resin so that the concentration thereof was 15% by mass, to prepare a polyamideimide varnish. The obtained polyamide-imide varnish was applied to a smooth surface of a polyester substrate (manufactured by Toyobo Co., Ltd., trade name "A4100") using a coater so that the film thickness of the self-supporting film was 55 μm, and the film was dried at 50 ℃ for 30 minutes and then at 140 ℃ for 15 minutes to obtain a self-supporting film. The free-standing film was fixed to a metal frame, and further dried at 300 ℃ for 30 minutes under the air to obtain a polyamide-imide film having a film thickness of 50 μm.
Production example 7
A polyamideimide film having a film thickness of 60 μm was obtained in the same manner as in production example 6, except that the self-supporting film was coated to a film thickness of 65 μm.
The thickness of the hard coat layer 12 is as shown in table 3.
Toughness T of the front panel 10 0 The determination was carried out by the method shown in the preliminary test item. The measurement results are shown in table 3. Toughness T of front panel 10 0 The value varies depending on the kind of the substrate 11 and the thickness of the hard coat layer 12.
[ protective plate 21 (1 st optical member) ]
As the protective plate 21, any one of the following resin films described in table 3 was used.
PET80 (trade name: SH82, manufactured by SKC Ltd., polyethylene terephthalate film thickness 80 μm)
TAC60 (trade name: KC6UAW, Konika Mentada, triacetyl cellulose film, thickness 60 μm)
TAC40 (trade name: KC4UAW, Konika Mentada, triacetyl cellulose film, thickness 40 μm)
COP13 (trade name: ZF 14-013, Nippon Rauyang Co., Ltd., cycloolefin resin film having a thickness of 13 μm)
Toughness T of the protective plate 21 1 The determination was carried out by the method shown in the preliminary test item. The measurement results are shown in table 3. Toughness T of the protection plate 21 1 The value varies depending on the type of resin film.
[ polarizing plate 22 (2 nd optical member) ]
A polyvinyl alcohol (PVA) film having an average polymerization degree of about 2400, a saponification degree of 99.9 mol% or more and a thickness of 20 μm was prepared. The PVA film was immersed in pure water at 30 ℃ and then immersed in an aqueous solution having an iodine/potassium iodide/water mass ratio of 0.02/2/100 at 30 ℃ to carry out iodine dyeing (iodine dyeing step). The PVA film subjected to the iodine dyeing step was immersed in an aqueous solution of potassium iodide/boric acid/water at a mass ratio of 12/5/100 at 56.5 ℃ to be subjected to boric acid treatment (boric acid treatment step). The PVA film subjected to the boric acid treatment step was washed with pure water at 8 ℃ and then dried at 65 ℃ to obtain a polarizer in which iodine was adsorbed and oriented to polyvinyl alcohol. The PVA film is stretched in the iodine dyeing step and the boric acid treatment step. The total draw ratio of the PVA film was 5.3 times. The thickness of the resulting polarizer was 7 μm.
The polarizer obtained above was bonded to a substrate with a kneading roll via a water-based adhesive. The obtained laminate was kept at a tension of 430N/m and dried at 60 ℃ for 2 minutes to obtain a linear polarizing plate having a substrate film on one side. The aqueous adhesive was prepared by adding 3 parts of carboxyl-modified polyvinyl alcohol ("Kuraray Poval KL 318", manufactured by Kuraray) and 1.5 parts of water-soluble polyamide epoxy Resin ("Sumirez Resin 650" (aqueous solution having a solid content of 30%), manufactured by takan chemical industries, inc.) to 100 parts of water.
A retardation film comprising a layer obtained by polymerizing and curing a liquid crystal compound was bonded to the polarizer via an adhesive layer having a thickness of 5 μm (thickness: 5 μm, layer composition: lambda/2 plate (thickness: 2 μm)/adhesive layer (thickness: 2 μm)/lambda/4 plate (thickness: 1 μm) composed of a layer obtained by curing a liquid crystal compound and an alignment film). Thus, a polarizing plate having a layer of "substrate/polarizer (thickness 7 μm)/adhesive layer (thickness 5 μm)/retardation film (thickness 5 μm)" was produced.
As shown in table 3, a resin film described in any one of the following items was used as a substrate to be attached to a polarizer.
TAC25 (trade name: KC2UAW, Konika Mentada, triacetyl cellulose film, thickness 25 μm)
COP23 (trade name: ZF 14-023, manufactured by Nippon Rayleigh Co., Ltd., cycloolefin resin film having a thickness of 23 μm)
The toughness T of the polarizing plate 22 2 The determination was carried out by the method shown in the preliminary test item. The measurement results are shown in table 3. Toughness T of polarizer 22 2 The value varies depending on the kind of the substrate.
Touch sensor Panel 23 (3 rd optical component)
A touch sensor panel having a longitudinal dimension of 177mm × a transverse dimension of 105mm, in which a transparent conductive layer, a separation layer, an adhesive layer, and a base material were laminated in this order, was prepared. The transparent conductive layer contained an ITO layer, and the separation layer contained a cured layer of an acrylic resin composition, and the sum of the thicknesses of the two layers was 7 μm. The thickness of the adhesive layer was 2 μm.
The resin film described in any one of tables 3 below was used as the substrate.
PET80 (trade name: SH82, manufactured by SKC Ltd., polyethylene terephthalate film thickness 80 μm)
TAC25 (trade name: KC2UAW, Konika Mentada, triacetyl cellulose film, thickness 25 μm)
COP23 (trade name: ZF 14-023, manufactured by Nippon Rayleigh Co., Ltd., cycloolefin resin film having a thickness of 23 μm)
Toughness T of touch sensor panel 23 3 The determination was carried out by the method shown in the preliminary test item. The measurement results are shown in table 3. Toughness T of touch sensor panel 23 3 The value varies depending on the kind of the substrate.
[ Table 3]
Description of the symbols
10 front panel, 11 substrate, 12 hard coat, 21 st optical component (protective plate), 22 nd optical component (polarizer), 23 rd optical component (touch sensor panel), 31 st adhesive layer, 32 nd adhesive layer, 2 nd adhesive layer, 33 rd adhesive layer.
Claims (5)
1. An optical laminate comprising a front plate comprising a base material and n optical members laminated in this order, wherein n is an integer of 2 or more,
an adhesive layer having a thickness of 10 μm or more is laminated on each of the front panel-side surfaces of the n optical members,
when the x-th optical member from the side close to the front panel is taken as the x-th optical member, the evaluation value A calculated by the following expression (1) satisfies the relationship of the following expression (2), wherein x is an integer from 1 to n,
50≤A≤500 (2)
in the formula (1), T 0 Is the toughness of the front panel, a 0 Is (thickness of the base material)/(thickness of the front panel), T x Is the toughness of the x-th optical member, a x Is (distance from surface of the front panel on the side opposite to the optical member side to surface of the x-th optical member on the side of the front panel, to the front panel side)/(thickness of the x-th optical member), wherein T 0 、T x In mJ/mm 3 The thickness and distance are expressed in μm.
2. The optical stack of claim 1, wherein one of the n optical components is a polarizer.
3. The optical stack of claim 1 or 2, wherein one of the n optical components is a touch sensor panel.
4. The optical stack according to any one of claims 1 to 3, wherein n is an integer of 4 or less.
5. A display device comprising the optical stack of any of claims 1-4.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2020-010108 | 2020-01-24 | ||
| JP2020010108A JP2021117334A (en) | 2020-01-24 | 2020-01-24 | Optical stack and display device |
| PCT/JP2020/044457 WO2021149359A1 (en) | 2020-01-24 | 2020-11-30 | Optical stack and display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115003499A true CN115003499A (en) | 2022-09-02 |
Family
ID=76993304
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202080094185.0A Pending CN115003499A (en) | 2020-01-24 | 2020-11-30 | Optical laminate and display device |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JP2021117334A (en) |
| KR (1) | KR20220126711A (en) |
| CN (1) | CN115003499A (en) |
| TW (1) | TW202129319A (en) |
| WO (1) | WO2021149359A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20260003680A (en) | 2023-04-27 | 2026-01-07 | 다이니폰 인사츠 가부시키가이샤 | Laminates and display devices for display devices |
| JP7573778B1 (en) * | 2024-02-29 | 2024-10-25 | 富士フイルム株式会社 | Touch sensor, image display device |
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Also Published As
| Publication number | Publication date |
|---|---|
| JP2021117334A (en) | 2021-08-10 |
| KR20220126711A (en) | 2022-09-16 |
| TW202129319A (en) | 2021-08-01 |
| WO2021149359A1 (en) | 2021-07-29 |
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