Adhesive member, optical film with adhesive member, display system, display body, and method for manufacturing display body

Abstract

Provided is an adhesive member which can contribute to improving the visibility of VR goggles. An adhesive member according to an embodiment of the present invention is provided with an adhesive layer and a release liner disposed on at least one surface of the adhesive layer, in which the number of foreign matters on the surface of the adhesive layer is 12 or less within a range of 20 mm square when the release liner is peeled off from the adhesive member in a Class 10000 environment specified by the United States Federal Standard 209D, and the number of foreign matters on the surface of the adhesive layer is 12 or less within a range of 20 mm square when the release liner is peeled off from the adhesive member in a Class 10000 environment specified by the United States Federal Standard 209D. The adhesive member is used by being laminated on a member constituting the VR goggles.

Description

Technical Field

[0001] This invention relates to adhesive components, optical films with adhesive components, display systems, display bodies, or methods for manufacturing display bodies. Existing technology

[0002] Image display devices, represented by liquid crystal displays and electroluminescent (EL) displays (such as organic EL displays), are rapidly becoming widespread. In order to realize image display and improve the performance of image display, optical components such as polarizing components and phase difference components are generally used in image display devices (see, for example, Patent Document 1).

[0003] In recent years, new applications for image display devices have been continuously developed. For example, goggles with displays for virtual reality (VR) have begun to be commercialized. The use of VR goggles in various situations is being explored, with the aim of improving their visibility.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 2021-103286 Summary of the Invention

[0007] The technical problem that the invention aims to solve

[0008] The main objective of this invention is to provide an adhesive component that can help improve the visibility of VR goggles.

[0009] Technical solutions for solving technical problems

[0010] 1. The adhesive component of the present invention comprises an adhesive layer and a release liner disposed on at least one side of the adhesive layer, wherein, under the Class 10000 environment specified by Federal Standard 209D, the number of foreign objects on the surface of the adhesive layer when the release liner is peeled off from the adhesive component is 12 or less within a 20 mm square range, and the adhesive component is laminated onto a component constituting a VR goggle for use.

[0011] 2. In the adhesive component described in 1 above, under an environment of 23°C and 55% RH, the charge on the surface of the adhesive layer after the release liner has been peeled off can be less than 4.0 kV.

[0012] 3. In the adhesive component described in 1 or 2 above, a conductive layer may also be provided, wherein the adhesive component is sequentially provided with the conductive layer, the adhesive layer and the release liner.

[0013] 4. In any of the adhesive components described in any one of 1 to 3 above, the adhesive layer may contain an antistatic agent.

[0014] 5-6. In any of the adhesive components described in any one of 1 to 4 above, the release liner may contain an antistatic agent.

[0015] 7. In the adhesive component described in 3 above, the conductive layer may contain an antistatic agent.

[0016] 8. In the adhesive component described in 4 above, the antistatic agent may be an ionic liquid.

[0017] 9. An optical film with an adhesive component, comprising the adhesive component of any one of 1 to 8 above.

[0018] 10. A display system for displaying an image to a user, comprising: a display element having a display surface from which light for displaying the image is emitted forward via a polarizing member; a reflective portion disposed in front of the display element, including a reflective polarizing member for reflecting light emitted from the display element; a first lens portion disposed in an optical path between the display element and the reflective portion; a semi-reflective mirror disposed between the display element and the first lens portion for transmitting light emitted from the display element and reflecting light reflected by the reflective portion back to the reflective portion; a first λ / 4 member disposed in an optical path between the display element and the semi-reflective mirror; and a second λ / 4 member disposed in an optical path between the semi-reflective mirror and the reflective portion, and comprising an optical film with an adhesive member as described in 9 above.

[0019] 11. In the display system described in 10 above, the display element may include the optical film with the adhesive component.

[0020] 12. A display body comprising the display system described in 10 or 11 above.

[0021] 13. A method for manufacturing a display body, comprising the display system described in 10 or 11 above.

[0022] 14. The manufacturing method of the display body described in 13 above may include the bonding action of the optical film with adhesive component described in 9 above.

[0023] Invention Effects

[0024] According to an embodiment of the present invention, an adhesive component that can help improve the visibility of VR goggles can be provided. Attached Figure Description

[0025] Figure 1 This is a schematic cross-sectional view of the adhesive component according to an embodiment of the present invention.

[0026] Figure 2 This is a schematic cross-sectional view of the adhesive component according to an embodiment of the present invention.

[0027] Figure 3 This is a schematic diagram illustrating a schematic structure of an example of a display system for VR goggles.

[0028] Figure 4 This is a schematic cross-sectional view of an optical film with an adhesive component according to an embodiment of the present invention.

[0029] Figure 5 This is a schematic cross-sectional view of a lens with an adhesive component according to an embodiment of the present invention. Detailed Implementation

[0030] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings, but the present invention is not limited to these embodiments. For clarity, the width, thickness, shape, etc., of various parts may be schematically shown compared to the embodiments, but these are merely examples and do not limit the interpretation of the present invention. Furthermore, repeated descriptions are sometimes omitted regarding the accompanying drawings.

[0031] (Definitions of terms and symbols)

[0032] The terms and symbols used in this specification are defined as follows.

[0033] (1) Refractive index (nx, ny, nz)

[0034] “nx” is the refractive index in the direction of maximum in-plane refractive index (i.e., the slow axis direction), “ny” is the refractive index in the direction orthogonal to the slow axis in-plane (i.e., the fast axis direction), and “nz” is the refractive index in the thickness direction.

[0035] (2) In-plane phase difference (Re)

[0036] “Re(λ)” is the in-plane phase difference measured at 23°C with light of wavelength λnm. For example, “Re(550)” is the in-plane phase difference measured at 23°C with light of wavelength 550nm. Re(λ) is calculated using the formula: Re(λ) = (nx - ny) × d when the thickness of the layer (film) is set to d (nm).

[0037] (3) Phase difference in the thickness direction (Rth)

[0038] “Rth(λ)” is the phase difference in the thickness direction measured at 23°C with light of wavelength λnm. For example, “Rth(550)” is the phase difference in the thickness direction measured at 23°C with light of wavelength 550nm. Rth(λ) is calculated using the formula: Rth(λ) = (nx - nz) × d when the layer (film) thickness is set to d (nm).

[0039] (4) Nz coefficient

[0040] The Nz coefficient can be obtained by Nz=Rth / Re.

[0041] (5) Angle

[0042] When an angle is mentioned in this specification, the angle includes both clockwise (+) and counterclockwise (-) directions relative to the reference direction. Therefore, for example, "45°" means ±45°.

[0043] A. Adhesive components

[0044] Figure 1 This is a schematic cross-sectional view of an adhesive component according to an embodiment of the present invention. The adhesive component 100 according to an embodiment of the present invention includes an adhesive layer 110 and a release liner 120 disposed on at least one side of the adhesive layer 110.

[0045] Figure 2 This is a schematic cross-sectional view of an adhesive component according to another embodiment of the present invention. The adhesive component 100' of the present invention sequentially includes a conductive layer 130, an adhesive layer 110, and a release liner 120.

[0046] The aforementioned adhesive components can be laminated onto the components constituting VR goggles. Alternatively, the aforementioned adhesive components can be directly laminated onto the components constituting VR goggles.

[0047] In this embodiment of the invention, under the Class 10000 environment specified by Federal Standard 209D, the number of foreign objects on the adhesive layer surface after peeling the liner from the bonded component is less than 12 within a 20 mm square area. The liner peeling can be performed at a peel angle of 180° and a stretching speed of 300 mm / min. The number of foreign objects is determined using an optical microscope 5 minutes after peeling the liner, and foreign objects with a major diameter of 10 µm or more are considered.

[0048] In this embodiment of the invention, by controlling the number of foreign objects as described above, an adhesive component can be provided that prevents image display defects in VR goggles. In recent years, with the use of pancake lenses or highly detailed displays in VR goggles, image display defects caused by even smaller foreign objects have become a problem. In such cases, the aforementioned adhesive component is particularly preferred. Using this adhesive component provides a display system that also prevents the introduction of minute foreign objects, thus significantly reducing image display defects.

[0049] Under the Class 10000 environment specified by Federal Standard 209D, after peeling the release liner from the bonded component, the number of foreign objects on the surface of the adhesive layer is preferably 10 or less within a 20 mm square area, more preferably 8 or less. Within this range, the aforementioned effect is significant. The fewer the number of foreign objects, the better; the lower limit is, for example, 5 (preferably 2, more preferably 0).

[0050] Under the Class 10000 environment specified by Federal Standard 209D, the number of foreign objects with a major diameter of less than 20 µm on the surface of the adhesive layer after the release liner has been peeled off from the bonded component is preferably 6 or less, more preferably 5 or less, further preferably 3 or less, and particularly preferably 0.

[0051] The number of foreign objects mentioned above can be controlled, for example, by adjusting the charge on the surface of the adhesive layer after the release liner has been peeled off. In an environment of 23°C and 55% RH, the charge on the surface of the adhesive layer after the release liner has been peeled off is preferably less than 4.0 kV, more preferably less than 3.0 kV, even more preferably less than 2.0 kV, and particularly preferably less than 1.0 kV. The aforementioned charge is the charge on the peeling surface of the release liner, measured in an environment of 23°C and 55% RH, after peeling the release liner for 10 seconds at a peeling angle of 180° and a stretching speed of 300 mm / min, with the distance from the release liner to the adhesive layer set to 35 mm.

[0052] The charge on the surface of the adhesive layer after the release liner has been removed can be adjusted by imparting a specified conductivity to any one or more of the elements constituting the adhesive component. For example, it can be adjusted by imparting conductivity to the adhesive layer and / or the release liner. Alternatively, it can be adjusted by, for example... Figure 2 A conductive layer is provided to adjust the electric charge on the surface of the adhesive layer. By providing a conductive layer, the adhesive component can be formed without imparting conductivity to the adhesive layer, thus making it easier to control the adhesive properties.

[0053] In one embodiment, the charge can be adjusted by adding an antistatic agent to the adhesive layer. According to this embodiment, a simple adhesive component can be obtained.

[0054] In one embodiment, the charge can be adjusted by adding an antistatic agent to the release liner. According to this embodiment, a simple adhesive component can be obtained. Furthermore, the adhesive component can be constructed without imparting conductivity to the adhesive layer, thus making it easy to control the adhesive properties.

[0055] The adhesion strength at 23°C when the bonded parts are adhered to alkali-free glass is preferably 1.0~12.0 N / 25 mm, more preferably 2.0~10.0 N / 25 mm. In this specification, the adhesion strength refers to the adhesion strength of the adhesive layer after the release liner has been peeled off from the bonded parts, and is measured according to the method of JIS Z 0237:2009 (bonding conditions: 2 kg roller back and forth once, stretching speed: 300 mm / min, peel angle: 180°).

[0056] B. Adhesive layer

[0057] The thickness of the adhesive layer is preferably 5µm to 100µm, more preferably 10µm to 50µm. From the viewpoint of smoothness, the thinner the thickness, the better.

[0058] The ISC value of the aforementioned adhesive layer is, for example, 100 or less, preferably 50 or less. The ISC value can serve as an indicator of smoothness or unevenness. If the ISC value is within such a range, an adhesive component capable of achieving excellent visibility in a display system can be obtained. The lower limit of the ISC value of the adhesive layer is, for example, 10. Furthermore, the ISC value can be calculated by measuring the image transmitted through the adhesive layer of the object and projected onto the screen using a CCD camera.

[0059] In one embodiment, the surface resistivity of the adhesive layer is preferably less than 1 × 10⁻⁶. 12 Ω / □, more preferably less than 5×10 11 Ω / □, further preferably less than 1×10 10 Ω / □. Within such a range, an adhesive component can be provided, which can be made into an adhesive layer preferably having conductivity, and can prevent image display defects in VR goggles. A conductive adhesive layer can be obtained, for example, by adding an antistatic agent described later. In the case of forming a conductive adhesive layer, the lower limit of the surface resistivity of the adhesive layer is, for example, 1 × 10⁻⁶. 8 Ω / □. The method for determining the surface resistivity is described below.

[0060] (Adhesive)

[0061] The adhesive layer described above includes an adhesive. Examples of adhesives include rubber-based adhesives, acrylic adhesives, silicone adhesives, polyurethane adhesives, vinyl alkyl ether adhesives, polyvinylpyrrolidone adhesives, polyacrylamide adhesives, and cellulose adhesives. In one embodiment, an acrylic adhesive may be used.

[0062] The aforementioned acrylic adhesives, as base polymers, comprise (meth)acrylic polymers. These (meth)acrylic polymers contain structural units derived from alkyl (meth)acrylates.

[0063] Alkyl methacrylates include, for example, alkyl methacrylates having straight-chain or branched alkyl groups having 1 to 20 carbon atoms (more preferably 3 to 18, particularly preferably 4 to 16). They can be used alone or in combination.

[0064] The content of alkyl methacrylate is preferably 65 to 99.99 parts by weight, more preferably 70 to 99.9 parts by weight, relative to 100 parts by weight of the (meth)acrylate polymer.

[0065] The aforementioned (meth)acrylic polymers may also, as needed, contain structural units derived from other monomers (comonomers) that can be copolymerized with the aforementioned alkyl (meth)acrylic esters. Examples of such monomers include the following.

[0066] Contains aromatic ring monomers: phenoxyethyl (meth)acrylate, benzyl (meth)acrylate;

[0067] Carboxyl-containing monomers: such as acrylic acid (AA), methacrylic acid (MAA), crotonic acid and other vinyl unsaturated monocarboxylic acids; maleic acid, itaconic acid, citraconic acid and other vinyl unsaturated dicarboxylic acids and their anhydrides (maleic anhydride, itaconic anhydride, etc.).

[0068] Hydroxyl-containing monomers: such as 2-hydroxyethyl methacrylate, 2-hydroxypropyl methacrylate, 3-hydroxypropyl methacrylate, 2-hydroxybutyl methacrylate and other hydroxyalkyl methacrylates; unsaturated alcohols such as vinyl alcohol and allyl alcohol; ether compounds such as 2-hydroxyethyl vinyl ether, 4-hydroxybutyl vinyl ether, diethylene glycol monovinyl ether;

[0069] Amino-containing monomers: such as ethyl (meth)acrylate, N,N-dimethylaminoethyl (meth)acrylate, tert-butylaminoethyl (meth)acrylate;

[0070] Epoxy monomers: for example, glycidyl (meth)acrylate, methyl glycidyl (meth)acrylate, allyl glycidyl ether;

[0071] Cyano-containing monomers: such as acrylonitrile and methacrylonitrile;

[0072] Ketone-containing monomers: such as diacetone (meth)acrylamide, diacetone (meth)acrylate, vinyl methyl ketone, vinyl ethyl ketone, allyl acetoacetate, vinyl acetoacetate;

[0073] Monomers having a nitrogen-containing ring: for example, N-vinyl-2-pyrrolidone, N-methylvinylpyrrolidone, N-vinylpyridine, N-vinylpiperidone, N-vinylpyrimidine, N-vinylpiperazine, N-vinylpyridine, N-vinylpyrrole, N-vinylimidazolium, N-vinyloxazole, N-vinylmorpholine, N-vinylcaprolactam, N-(meth)acryloylmorpholine;

[0074] Alkoxysilane-containing monomers: for example, 3-(meth)acryloyloxypropyltrimethoxysilane, 3-(meth)acryloyloxypropyltriethoxysilane, 3-(meth)acryloyloxypropylmethyldimethoxysilane, 3-(meth)acryloyloxypropylmethyldiethoxysilane;

[0075] Monomers containing isocyanate groups: (meth)acryloyl isocyanate, 2-(meth)acryloyloxyethyl isocyanate, and m-isopropenyl-α,α-dimethylbenzyl isocyanate;

[0076] Silane family: 3-Acryloyloxypropyltriethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, 4-vinylbutyltrimethoxysilane, 4-vinylbutyltriethoxysilane, 8-vinyloctyltrimethoxysilane, 8-vinyloctyltriethoxysilane, 10-methacryloyloxydecyltrimethoxysilane, 10-acryloyloxydecyltrimethoxysilane, 10-methacryloyloxydecyltriethoxysilane, 10-acryloyloxydecyltriethoxysilane.

[0077] These monomers can be used alone or in combination of two or more.

[0078] The content of comonomers is preferably 0.01 to 35 parts by weight, more preferably 2 to 25 parts by weight, relative to 100 parts by weight of (meth)acrylic polymer.

[0079] In one embodiment, the (meth)acrylic polymer comprises structural units derived from hydroxyl-containing monomers and / or structural units derived from carboxyl-containing monomers. These comonomers become reaction sites with the crosslinking agent when the adhesive contains a crosslinking agent. Since hydroxyl-containing monomers, carboxyl-containing monomers, etc., have good reactivity with intermolecular crosslinking agents, these monomers are preferably used to improve the cohesiveness and heat resistance of the resulting adhesive layer.

[0080] The weight-average molecular weight (Mw) of the aforementioned (meth)acrylic acid polymers is, for example, 500,000 to 3,000,000, preferably 700,000 to 2,700,000, and more preferably 800,000 to 2,500,000. The weight-average molecular weight refers to the value determined by GPC (gel permeation chromatography) and calculated using polystyrene.

[0081] The (meth)acrylic acid polymers can be manufactured using known methods such as solution polymerization, bulk polymerization, emulsion polymerization, and various free radical polymerizations. Furthermore, the resulting (meth)acrylic acid polymers can be any of the following: random copolymers, block copolymers, graft copolymers, etc.

[0082] The adhesives described above may contain any suitable additives as needed. Examples of such additives include crosslinking agents, crosslinking catalysts, tackifiers, plasticizers, pigments, dyes, fillers, anti-aging agents, conductive materials, antistatic agents, ultraviolet absorbers, light stabilizers, peel modifiers, softeners, surfactants, flame retardants, antioxidants, etc.

[0083] The aforementioned crosslinking agents can be organic crosslinking agents or polyfunctional metal chelates. Examples of organic crosslinking agents include isocyanate-based, peroxide-based, epoxy-based, and imine-based crosslinking agents. Polyfunctional metal chelates are substances in which multivalent metals are covalently or coordinately bonded to organic compounds. Examples of multivalent metal atoms include Al, Cr, Zr, Co, Cu, Fe, Ni, V, Zn, In, Ca, Mg, Mn, Y, Ce, Sr, Ba, Mo, La, Sn, and Ti. Examples of organic compounds that can be covalently or coordinately bonded include oxygen atoms; examples of organic compounds include alkyl esters, alcohols, carboxylic acids, ethers, and ketones.

[0084] The crosslinking agent content is preferably 3 parts by weight or less, more preferably 0.01 parts by weight to 3 parts by weight, and even more preferably 0.02 parts by weight to 2 parts by weight, relative to 100 parts by weight of the (meth)acrylic polymer.

[0085] (Antistatic agent)

[0086] As described above, in one embodiment, the adhesive layer comprises an antistatic agent. The antistatic agent can be an ionic compound, preferably an ionic compound having a fluoride anion. Alternatively, the antistatic agent can be an ionic surfactant, a conductive polymer, conductive microparticles, etc. The adhesive layer containing the antistatic agent can be formed, for example, by applying a conductive adhesive composition containing the aforementioned adhesive and antistatic agent using any suitable method.

[0087] Examples of such ionic compounds include inorganic cation and anion salts and organic cation and anion salts.

[0088] Inorganic cation and anion salts can be, for example, alkali metal salts formed from alkali metal cations and anions. Alkali metal salts can be organic or inorganic salts of alkali metals.

[0089] Examples of alkali metal ions constituting the cation portion of an alkali metal salt include lithium, sodium, and potassium ions. Lithium ions are preferred.

[0090] The anionic portion of alkali metal salts can be composed of organic or inorganic substances. For example, CH3COO can be used as the anionic portion of organic salts. - CF3COO - CH3SO3 - CF3SO3 - (CF3SO2)3C - C4F9SO3 - C3F7COO - (CF3SO2)(CF3CO)N - , - O3S(CF2)3SO3 - PF6 - CO3 2- (C) n F 2n +1SO2)2N - (n is an integer from 1 to 10), CF2 (C m F 2m SO2)2N - (m is an integer from 1 to 10) - O3S (CF2) l SO3 - (l is an integer from 1 to 10), (C) p F 2p +1SO2)N - (C) q F 2q +1SO2), (p, q are integers from +1 to 10), (FSO2)2N - wait.

[0091] Cl can be used as the anionic part that constitutes inorganic salts. - ,Br - I - AlCl4 - Al2Cl7 - BF4 - PF6 - ClO4 - NO3 - AsF6 - SbF6 - NbF6 - TaF6 - (CN)2N - wait.

[0092] In one embodiment, anions containing fluorine atoms can be used. Alkali metal salts having anionic portions containing fluorine atoms are advantageous in terms of excellent ionic dissociation.

[0093] Examples of alkali metal organic salts include sodium acetate, sodium alginate, sodium lignosulfonate, sodium toluenesulfonate, LiCF3SO3, Li(CF3SO2)2N, Li(CF3SO2)2N, Li(C2F5SO2)2N, Li(C4F9SO2)2N, Li(CF3SO2)3C, KO3S(CF2)3SO3K, and LiO3S(CF2)3SO3K, with LiCF3SO3 being the preferred choice. 3. Li(CF3SO2)2N, Li(C2F5SO2)2N, Li(C4F9SO2)2N, Li(CF3SO2)3C, etc., more preferably Li(CF3SO2)2N, Li(C2F5SO2)2N, Li(C4F9SO2)2N, Li(FSO2)2N, etc., containing fluorinated lithium imide salts, particularly preferably bis(trifluoromethanesulfonyl)imide lithium salt and bis(fluorosulfonyl)imide lithium salt.

[0094] Examples of inorganic salts of alkali metals include lithium perchlorate and lithium iodide.

[0095] The above-mentioned organic cation and anion salts are organic salts, with their cation portion composed of organic matter. The anion portion can be either organic or inorganic. Organic cation and anion salts can be ionic liquids or ionic solids.

[0096] Ionic liquids are preferably used as antistatic agents. Using ionic compounds allows for the formation of adhesive layers with excellent transparency and smoothness. Such adhesive layers result in bonded parts with fewer surface defects. In this specification, ionic liquids refer to molten salts (organic cationic and anionic salts) that are liquid at temperatures below 40°C. Furthermore, ionic liquids are particularly preferred to have a melting point below 25°C.

[0097] The aforementioned organic cation and anion salts comprise both cationic and anionic components composed of organic matter. Examples of cationic components include: pyridinium cations, piperidinium cations, pyrrolidineonium cations, cations with a dihydropyrrole skeleton, cations with a pyrrole skeleton, imidazolineonium cations, tetrahydropyrimidineonium cations, dihydropyrimidineonium cations, pyrazolium cations, pyrazolineonium cations, tetraalkylammonium cations, trialkylsulfonium cations, tetraalkylphosphine cations, etc.

[0098] Examples of anionic components include: Cl - ,Br - I - AlCl4 - Al2Cl7 - BF4- PF6 - ClO4 - NO3 - CH3COO - CF3COO - CH3SO3 - CF3SO3 - (CF3SO2)3C - AsF6 - SbF6 - NbF6 - TaF6 - (CN)2N - C4F9SO3 - C3F7COO - (CF3SO2)(CF3CO)N - , - O3S(CF2)3SO3 - (C) n F 2n +1SO2)2N - (n is an integer from 1 to 10), CF2 (C m F 2m SO2)2N - (m is an integer from 1 to 10) - O3S (CF2) l SO3 - (l is an integer from 1 to 10), (C) p F 2p +1SO2)N - (C) q F 2q +1SO2), (p, q are integers from 1 to 10), (FSO2)2N - wait.

[0099] In one embodiment, anions containing fluorine atoms can be used. Alkali metal salts having anionic portions containing fluorine atoms have the advantage of excellent ion dissociation properties.

[0100] In one embodiment, the fluorine-containing anion is preferably a fluorinated imide anion, more preferably a bis(trifluoromethanesulfonyl)imide anion or a bis(fluorosulfonyl)imide anion. Among these, bis(fluorosulfonyl)imide anion is particularly preferred. When using a bis(fluorosulfonyl)imide anion, the desired charge can be achieved by adding only a small amount. A small amount of antistatic agent can reduce the thickness of the adhesive layer and improve smoothness.

[0101] In addition, inorganic salts such as ammonium chloride, aluminum chloride, copper chloride, ferrous chloride, ferric chloride, and ammonium sulfate can also be used for ionic compounds.

[0102] In addition, other antistatic agents can be achieved using materials that impart antistatic properties, such as ionic surfactants, conductive polymers, and conductive microparticles. Ionic surfactants can be categorized into various types, including cationic (e.g., quaternary ammonium salts, phosphine salts, sulfonium salts, etc.), anionic (carboxylic acid salts, sulfonates, sulfates, phosphates, phosphites, etc.), zwitterionic (sulfobetaine salts, alkyl betaines, alkyl imidazolium betaines, etc.), and nonionic (polyol derivatives, β-cyclodextrin inclusion complexes, dehydrated sorbitol fatty acid monoesters / diesters, polyepoxide derivatives, amine oxides, etc.).

[0103] The proportion of antistatic agent in the adhesive layer relative to 100 parts by weight of the base polymer of the adhesive is preferably 0.05 parts by weight to 20 parts by weight, more preferably 0.1 parts by weight to 18 parts by weight, and even more preferably 1 part by weight to 16 parts by weight. Within this range, an adhesive layer with excellent transparency, durability, and tight adhesion can be formed.

[0104] C. Conductive layer

[0105] The surface resistivity of the aforementioned conductive layer is preferably less than 1×10⁻⁶. 12 Ω / □, more preferably less than 5×10 11 Ω / □, further preferably less than 1×10 10 Ω / □. Within this range, an adhesive component can be provided to prevent image display defects in VR goggles. The lower limit of the surface resistance value of the aforementioned conductive layer is, for example, 1 × 10⁻⁶. 6 Ω / □.

[0106] Typically, the conductive layer contains an antistatic agent. This allows the conductivity of the conductive layer to be adjusted. Examples of antistatic agents include those mentioned above.

[0107] In one embodiment, the conductive layer comprises a conductive polymer. From the viewpoints of optical properties, appearance, antistatic effect, and the stability of the antistatic effect during humidification, a conductive polymer is preferred.

[0108] Examples of conductive polymers include polyaniline and polythiophene. Conductive polymers can be soluble in organic solvents, water-soluble, or water-dispersible. Water-soluble or water-dispersible conductive polymers are preferred.

[0109] Furthermore, the aforementioned water-soluble or water-dispersible conductive polymers, such as polyaniline and polythiophene, preferably possess hydrophilic functional groups in their molecules. Examples of hydrophilic functional groups include sulfonic acid groups, amino groups, amide groups, imine groups, quaternary ammonium salt groups, hydroxyl groups, mercapto groups, hydrazine groups, carboxyl groups, sulfate ester groups, phosphate ester groups, or salts thereof. By possessing hydrophilic functional groups within the molecule, the aforementioned water-soluble or water-dispersible conductive polymers can be readily formulated.

[0110] Furthermore, regarding the material forming the anchoring layer, adhesive components can be added together with the aforementioned conductive polymer to improve the film-forming properties of the conductive polymer and its tight adhesion to the optical film. In the case of an aqueous material containing a water-soluble or water-dispersible conductive polymer, a water-soluble or water-dispersible adhesive component is used. Examples of adhesives include: oxazoline-containing polymers, polyurethane resins, polyester resins, acrylic resins, polyether resins, cellulose resins, polyvinyl alcohol resins, epoxy resins, polyvinylpyrrolidone, polystyrene resins, polyethylene glycol, pentaerythritol, etc. Polyurethane resins, polyester resins, and acrylic resins are particularly preferred. One or more of these adhesives can be used appropriately according to their intended application.

[0111] The amount of antistatic agent (preferably a conductive polymer) and adhesive used depends on their type, but it is preferable to adjust them so that the surface resistance value of the resulting conductive layer is within the above-mentioned range.

[0112] D. Peeling the liner

[0113] As a release liner, for example, a release liner can be made from a substrate such as paper or plastic film whose surface has undergone a release treatment such as polysiloxane treatment or fluorinated polysiloxane treatment. Examples of such substrates include olefin-based resin films such as polyethylene-based resin films, polypropylene-based resin films, and cyclic olefin-based resin (COP) films, and polyester-based films such as polyethylene terephthalate-based films. Alternatively, the release liner can also be made from fluorinated resin films such as polytetrafluoroethylene (PTFE)-based resin films, or olefin-based resin films such as polyethylene-based resin films, polypropylene-based resin films, and cyclic olefin-based resin (COP) films.

[0114] In one embodiment, the surface resistivity of the peeling liner is preferably less than 1 × 10⁻⁶. 12 Ω / □, more preferably less than 5×10 11 Ω / □, further preferably less than 1×10 10 Ω / □. Using a release liner preferably with conductivity in this way provides an adhesive component that can prevent image display defects in VR goggles. When the release liner is made conductive, the lower limit of the surface resistance value of the release liner is, for example, 1 × 10⁻⁶. 6 Ω / □.

[0115] In one embodiment, the release liner described above has antistatic properties. Such a release liner, for example, contains an antistatic agent. The antistatic agent may be contained in the substrate (a substrate containing antistatic material) or the antistatic layer, which are components of the release liner. Examples of antistatic agents include the aforementioned antistatic agents. That is, ionic compounds, ionic surfactants, conductive polymers, conductive microparticles, etc., can be used. In one embodiment, the release liner contains a conductive polymer. The amount of antistatic agent (preferably a conductive polymer) used depends on its type, and is preferably adjusted to ensure that the surface resistivity of the resulting release liner is within the aforementioned range.

[0116] E. Display System

[0117] Figure 3 This is a schematic diagram illustrating the general configuration of a display system (VR goggles) according to one embodiment of the present invention. Figure 3 The schematic diagram shows the arrangement and shape of the various components of the display system 2. The display system 2 includes: a display element 12, a reflective portion 14 including a reflective polarizing component, a first lens portion 16, a semi-reflective mirror 18, a first phase difference component 20, a second phase difference component 22, and a second lens portion 24. The reflective portion 14 is disposed on the display surface 12a side, i.e., in front of the display element 12, and reflects light emitted from the display element 12. The first lens portion 16 is disposed in the optical path between the display element 12 and the reflective portion 14, and the semi-reflective mirror 18 is disposed between the display element 12 and the first lens portion 16. The first phase difference component 20 is disposed in the optical path between the display element 12 and the semi-reflective mirror 18, and the second phase difference component 22 is disposed in the optical path between the semi-reflective mirror 18 and the reflective portion 14.

[0118] The display element 12 is, for example, a liquid crystal display or an organic EL display, having a display surface 12a for displaying images. Light emitted from the display surface 12a passes through a polarizing component (represented by a polarizing film) included in the display element 12 and is then emitted as first linearly polarized light.

[0119] The first phase difference component 20 is a λ / 4 component, which can convert the first linearly polarized light incident on the first phase difference component 20 into the first circularly polarized light (hereinafter, the first phase difference component is sometimes referred to as the first λ / 4 component). In addition, the first phase difference component 20 can also be integrated with the display element 12.

[0120] The semi-reflective mirror 18 allows light emitted from the display element 12 to pass through and reflects light reflected by the reflective portion 14 back to the reflective portion 14. The semi-reflective mirror 18 is integrally provided with the first lens portion 16.

[0121] The second phase difference component 22 is a λ / 4 component that allows light reflected by the reflector 14 and the semi-reflector 18 to pass through the reflector 14, which includes a reflective polarizing component (hereinafter, the second phase difference component is sometimes referred to as the second λ / 4 component). In addition, the second phase difference component 22 may also be integrally provided with the first lens component 16.

[0122] The first circularly polarized light emitted from the first λ / 4 component 20 passes through the half-reflector 18 and the first lens section 16, and is converted into second linearly polarized light by the second λ / 4 component 22. The second linearly polarized light emitted from the second λ / 4 component 22 does not penetrate the reflective polarizing component included in the reflective section 14 and is reflected towards the half-reflector 18. At this time, the polarization direction of the second linearly polarized light incident on the reflective polarizing component included in the reflective section 14 is in the same direction as the reflection axis of the reflective polarizing component. Therefore, the second linearly polarized light incident on the reflective section 14 is reflected by the reflective polarizing component.

[0123] The second linearly polarized light reflected by the reflector 14 is converted into second circularly polarized light by the second λ / 4 component 22. The second circularly polarized light emitted from the second λ / 4 component 22 is reflected by the half-reflector 18 by the first lens 16. The circularly polarized light reflected by the half-reflector 18 passes through the first lens 16 and is converted into third linearly polarized light by the second λ / 4 component 22. The third linearly polarized light is transmitted through the reflective polarizing component included in the reflector 14. At this time, the polarization direction of the third linearly polarized light incident on the reflective polarizing component included in the reflector 14 is in the same direction as the transmission axis of the reflective polarizing component. Therefore, the third linearly polarized light incident on the reflector 14 is transmitted through the reflective polarizing component.

[0124] The light from the transmission and reflection section 14 passes through the second lens section 24 and enters the user's eye 26.

[0125] For example, the absorption axis of the polarizing component included in the display element 12 and the reflection axis of the reflective polarizing component included in the reflective portion 14 can be arranged approximately parallel to each other, or approximately orthogonal to each other. The angle formed by the absorption axis of the polarizing component included in the display element 12 and the slow axis of the first phase difference component 20 is, for example, 40°~50°, 42°~48°, or approximately 45°. The angle formed by the absorption axis of the polarizing component included in the display element 12 and the slow axis of the second phase difference component 22 is, for example, 40°~50°, 42°~48°, or approximately 45°.

[0126] The in-plane phase difference Re (550) of the first phase difference component 20 is, for example, 100nm~190nm, 110nm~180nm, 130nm~160nm, or 135nm~155nm.

[0127] The first retardation member 20 preferably exhibits an inverse wavelength dispersion characteristic in which the retardation value increases with the wavelength of the measurement light. Re(450) / Re(550) of the first retardation member 20 is, for example, less than 1, may be 0.95 or less, may further be less than 0.90, and more preferably may be 0.85 or less. Re(450) / Re(550) of the first retardation member 20 is, for example, 0.75 or more.

[0128] The first retardation member 20 preferably has a refractive index characteristic showing a relationship of nx > ny ≧ nz. Here, "ny = nz" includes not only the case where ny and nz are exactly the same but also the case where they are substantially the same. Therefore, within the range not impairing the effects of the present invention, there may be a case where ny < nz. The Nz coefficient of the first retardation member 20 is preferably 0.9 to 3, more preferably 0.9 to 2.5, further preferably 0.9 to 1.5, and particularly preferably 0.9 to 1.3.

[0129] The first retardation member 20 is formed of any suitable material that can satisfy the above characteristics. The first retardation member 20 may be, for example, a stretched film of a resin film or an alignment cured layer of a liquid crystal compound. In addition, the stretched film of the resin film is sometimes referred to as a retardation film.

[0130] Examples of the resin contained in the resin film include: polycarbonate resins, polyester carbonate resins, polyester resins, polyvinyl acetal resins, polyarylate resins, cyclic olefin resins, cellulose resins, polyvinyl alcohol resins, polyamide resins, polyimide resins, polyether resins, polystyrene resins, acrylic resins, and the like. These resins may be used alone or in combination (for example, blended or copolymerized). When the first retardation member 20 exhibits an inverse wavelength dispersion characteristic, a resin film containing a polycarbonate resin or a polyester carbonate resin (hereinafter sometimes simply referred to as a polycarbonate resin) may be preferably used.

[0131] As the aforementioned polycarbonate-based resin, any suitable polycarbonate-based resin can be used, as long as the effects of the present invention are achieved. For example, the polycarbonate-based resin comprises: structural units derived from fluorene-based dihydroxy compounds; structural units derived from isosorbide-based dihydroxy compounds; and structural units derived from at least one dihydroxy compound selected from the group consisting of alicyclic diols, alicyclic diethanols, diethylene glycol, triethylene glycol, or polyethylene glycol, and alkylene glycols or spirodiols. The polycarbonate-based resin preferably comprises: structural units derived from fluorene-based dihydroxy compounds; structural units derived from isosorbide-based dihydroxy compounds; structural units derived from alicyclic diethanols; and / or structural units derived from diethylene glycol, triethylene glycol, or polyethylene glycol; more preferably, it comprises: structural units derived from fluorene-based dihydroxy compounds; structural units derived from isosorbide-based dihydroxy compounds; and structural units derived from diethylene glycol, triethylene glycol, or polyethylene glycol. The polycarbonate-based resin may also contain structural units derived from other dihydroxy compounds as needed. Furthermore, detailed descriptions of the polycarbonate resin suitable for use in the first phase difference component and the method for forming the first phase difference component are described, for example, in Japanese Patent Application Publication Nos. 2014-10291, 2014-26266, 2015-212816, 2015-212817, and 2015-212818, which are incorporated herein by reference.

[0132] The aforementioned orientation-cured layer of the liquid crystal compound is a layer in which the liquid crystal compound is oriented in a predetermined direction within the layer, and its orientation state is fixed. Furthermore, the concept of "orientation-cured layer" includes orientation-cured layers obtained by curing liquid crystal monomers as described later. In the first phase retardation member, typically, the rod-shaped liquid crystal compounds are oriented (planar orientation) with their arrangement along the slow axis direction of the first phase retardation member. Examples of rod-shaped liquid crystal compounds include, for example, liquid crystal polymers and liquid crystal monomers. The liquid crystal compound is preferably polymerizable. If the liquid crystal compound is polymerizable, its orientation state can be fixed by polymerizing it after orientation.

[0133] The orientation-cured layer of the aforementioned liquid crystal compound (liquid crystal orientation-cured layer) can be formed by: performing an orientation treatment on the surface of a specified substrate, applying a coating liquid containing the liquid crystal compound to the surface, orienting the liquid crystal compound in a direction corresponding to the orientation treatment, and fixing the orientation state. Any suitable orientation treatment can be used. Specifically, mechanical orientation treatment, physical orientation treatment, and chemical orientation treatment can be cited. Specific examples of mechanical orientation treatment include friction treatment and stretching treatment. Specific examples of physical orientation treatment include magnetic field orientation treatment and electric field orientation treatment. Specific examples of chemical orientation treatment include oblique evaporation and photo-orientation treatment. The processing conditions for each orientation treatment can be any suitable condition according to the purpose.

[0134] The orientation of liquid crystal compounds can be performed at a temperature that allows the liquid crystal phase to appear, depending on the type of liquid crystal compound. Through this temperature treatment, the liquid crystal compound enters a liquid crystal state and becomes oriented according to the orientation treatment direction on the substrate surface.

[0135] In one embodiment, the orientation state is fixed by cooling the liquid crystal compound oriented as described above. When the liquid crystal compound is polymerizable or crosslinkable, the orientation state is fixed by performing a polymerization or crosslinking treatment on the liquid crystal compound oriented as described above.

[0136] As the aforementioned liquid crystal compound, any suitable liquid crystal polymer and / or liquid crystal monomer can be used. The liquid crystal polymer and liquid crystal monomer can be used alone or in combination. Specific examples of liquid crystal compounds and methods for fabricating liquid crystal orientation-cured layers are described, for example, in Japanese Patent Application Publication No. 2006-163343, Japanese Patent Application Publication No. 2006-178389, and International Publication No. 2018 / 123551. This specification incorporates the descriptions in these publications by way of reference.

[0137] The thickness of the first phase difference component 20 is preferably 100µm or less. Specifically, the thickness of the first phase difference component 20, which is formed by extending a resin film, is, for example, 10µm to 100µm, preferably 10µm to 70µm, more preferably 10µm to 60µm, and even more preferably 20µm to 50µm. Furthermore, the thickness of the first phase difference component 20, which is formed by a liquid crystal alignment and curing layer, is, for example, 1µm to 10µm, preferably 1µm to 8µm, more preferably 1µm to 6µm, and even more preferably 1µm to 4µm.

[0138] The in-plane phase difference Re (550) of the second phase difference component 22 is, for example, 100nm~190nm, 110nm~180nm, 130nm~160nm, or 135nm~155nm.

[0139] The second retardation member 22 preferably exhibits an inverse wavelength dispersion characteristic in which the retardation difference increases with the wavelength of the measurement light. Re(450) / Re(550) of the second retardation member 22 is, for example, less than 1, may be 0.95 or less, may also be less than 0.90, and may further be 0.85 or less. Re(450) / Re(550) of the second retardation member 22 is, for example, 0.75 or more.

[0140] The second retardation member 22 preferably has a refractive index characteristic showing a relationship of nx > ny ≧ nz. Here, "ny = nz" includes not only the case where ny and nz are exactly the same, but also the case where they are substantially the same. Therefore, within the range not impairing the effects of the present invention, there may be a case where ny < nz. The Nz coefficient of the second retardation member 22 is preferably 0.9 to 3, more preferably 0.9 to 2.5, further preferably 0.9 to 1.5, and particularly preferably 0.9 to 1.3.

[0141] The second retardation member 22 is formed of any suitable material that can satisfy the above characteristics. The second retardation member 22 can be, for example, a stretched film of a resin film or an alignment cured layer of a liquid crystal compound. Regarding the second retardation member 22 constituted by a stretched film of a resin film or an alignment cured layer of a liquid crystal compound, the same description as that of the first retardation member 20 can be applied. The first retardation member 20 and the second retardation member 22 can be members having the same constitution (forming material, thickness, optical characteristics, etc.), or can be members having different constitutions.

[0142] The thickness of the second retardation member 22 is preferably 100 µm or less. Specifically, the thickness of the second retardation member 22 constituted by a stretched film of a resin film is, for example, 10 µm to 100 µm, preferably 10 µm to 70 µm, more preferably 10 µm to 60 µm, and further preferably 20 µm to 50 µm. In addition, the thickness of the second retardation member 22 constituted by an alignment cured layer of a liquid crystal is, for example, 1 µm to 10 µm, preferably 1 µm to 8 µm, more preferably 1 µm to 6 µm, and further preferably 1 µm to 4 µm.

[0143] The reflection portion 14 may include an absorption type polarizing member in addition to the reflection type polarizing member. The absorption type polarizing member can be disposed in front of the reflection type polarizing member. The reflection axis of the reflection type polarizing member and the absorption axis of the absorption type polarizing member can be arranged substantially parallel to each other, and the transmission axis of the reflection type polarizing member and the transmission axis of the absorption type polarizing member can be arranged substantially parallel to each other. When the reflection portion 14 includes an absorption type polarizing member, the reflection portion 14 may also include a laminate having a reflection type polarizing member and an absorption type polarizing member.

[0144] The aforementioned reflective polarizing element allows light to be transmitted while maintaining the polarization state of polarized light parallel to its transmission axis (typically linearly polarized light), and reflects light with other polarization states. The orthogonal transmittance (Tc) of the reflective polarizing element can be, for example, 0.01% to 3%. The unit transmittance (Ts) of the reflective polarizing element can be, for example, 43% to 49%, preferably 45% to 47%. The polarization degree (P) of the reflective polarizing element can be, for example, 92% to 99.99%. The reflective polarizing element is typically constructed of a film with a multilayer structure (sometimes called a reflective polarizing film). Examples of commercially available reflective polarizing films include, for example, those manufactured by 3M under the trade names "DBEF" and "APF," and those manufactured by Nitto Denko under the trade name "APCF."

[0145] The aforementioned absorptive polarizing component may typically include a resin film containing a dichroic substance (sometimes referred to as an absorptive polarizing film). The thickness of the absorptive polarizing film may be, for example, 1µm or more and 20µm or less, 2µm or more and 15µm or less, 12µm or less, 10µm or less, 8µm or less, or 5µm or less.

[0146] The above-mentioned absorptive polarizing film can be made from a single layer of resin film or from a laminate of two or more layers.

[0147] When producing a single-layer resin film, an absorptive polarizing film can be obtained by subjecting hydrophilic polymer films such as polyvinyl alcohol (PVA) films, partially formalized PVA films, and partially saponified ethylene-vinyl acetate copolymer films to dyeing treatments using dichroic substances such as iodine or dichroic dyes, stretching treatments, etc. Among these, an absorptive polarizing film obtained by dyeing a PVA film with iodine and then uniaxially stretching it is preferred.

[0148] The dyeing using iodine described above can be performed, for example, by immersing the PVA membrane in an aqueous iodine solution. The elongation ratio of the uniaxial stretching is preferably 3 to 7 times. Elongation can be performed after dyeing or simultaneously with dyeing. Alternatively, dyeing can be performed after stretching. Depending on the requirements, the PVA membrane may undergo swelling treatment, crosslinking treatment, washing treatment, drying treatment, etc.

[0149] Examples of laminates fabricated using two or more layers include: a laminate of a resin substrate and a PVA-based resin layer (PVA-based resin film) deposited on the resin substrate; or a laminate of a resin substrate and a PVA-based resin layer coated on the resin substrate. An absorptive polarizing film obtained using a laminate of a resin substrate and a PVA-based resin layer coated on the resin substrate can be fabricated, for example, by the following steps: coating a PVA-based resin solution onto a resin substrate and drying it to form a PVA-based resin layer on the resin substrate, thus obtaining a laminate of the resin substrate and the PVA-based resin layer; and stretching and dyeing the laminate to form an absorptive polarizing film from the PVA-based resin layer. In this embodiment, it is preferable to form a polyvinyl alcohol-based resin layer containing a halide and a polyvinyl alcohol-based resin on one side of the resin substrate. Stretching typically includes immersing the laminate in an aqueous boric acid solution. Furthermore, if necessary, stretching may also include air stretching the laminate at a high temperature (e.g., above 95°C) before stretching in the aqueous boric acid solution. Furthermore, in this embodiment, it is preferable to subject the laminate to a drying shrinkage treatment, in which the laminate is heated while being conveyed along its long side, thereby shrinking it by more than 2% in the width direction. Typically, the manufacturing method of this embodiment includes sequentially performing an air-assisted stretching treatment, a dyeing treatment, an underwater stretching treatment, and a drying shrinkage treatment on the laminate. By introducing air-assisted stretching, the crystallinity of PVA can be improved even when PVA is coated onto a thermoplastic resin, achieving high optical properties. In addition, by simultaneously improving the orientation of PVA beforehand, problems such as decreased orientation or dissolution of PVA can be prevented when immersed in water during subsequent dyeing or stretching steps, achieving high optical properties. Furthermore, when the PVA-based resin layer is immersed in a liquid, compared to when the PVA-based resin layer does not contain halides, the orientation disorder and reduction of polyvinyl alcohol molecules can be suppressed more effectively. Therefore, the optical properties of the absorptive polarizing film obtained by immersing the laminate in a liquid through dyeing and underwater stretching treatments can be improved. Furthermore, by shrinking the laminate in the width direction through a drying shrinkage process, optical properties can be improved. The resulting resin substrate / absorbent polarizing film laminate can be used directly (i.e., the resin substrate can be used as a protective layer for the absorbent polarizing film), or it can be used on the release surface after peeling the resin substrate from the resin substrate / absorbent polarizing film laminate, or on the surface layer opposite to the release surface, to achieve any suitable purpose. Detailed descriptions of the manufacturing method of the absorbent polarizing film are described, for example, in Japanese Patent Application Publication No. 2012-73580 and Japanese Patent No. 6470455. The entire contents of these publications are incorporated herein by reference.

[0150] The orthogonal transmittance (Tc) of the absorptive polarizing element (absorbent polarizing film) is preferably 0.5% or less, more preferably 0.1% or less, and even more preferably 0.05% or less. The monomer transmittance (Ts) of the absorptive polarizing element (absorbent polarizing film) is, for example, 41.0% to 45.0%, preferably 42.0% or more. The polarization degree (P) of the absorptive polarizing element (absorbent polarizing film) is, for example, 99.0% to 99.997%, preferably 99.9% or more.

[0151] The various elements contained in a display body with a display system are integrated as needed via adhesive layers. The adhesive layers can be formed by adhesives or by bonding agents.

[0152] In one embodiment, either of the adhesive layers is made into the adhesive layer described in paragraph B, or a laminate comprising the adhesive layer and the conductive layer described in paragraph C.

[0153] Figure 4 This is a schematic cross-sectional view of an optical film with an adhesive member according to an embodiment of the present invention. The optical film 200 with the adhesive member includes an optical film A and the aforementioned adhesive member 100 disposed on at least one side of the optical film A. The adhesive member 100 may be configured such that the release liner 120 is on the side opposite to the optical film A. The adhesive member may also be an adhesive member having a conductive layer (i.e., Figure 2 The adhesive component 100' shown.

[0154] As optical film A, any suitable optical film can be used. Examples of optical film A include reflective polarizers, absorptive polarizers, reflective polarizing plates, absorptive polarizing plates, and phase retardation films. Examples of reflective polarizers include the aforementioned reflective polarizing components. Examples of absorptive polarizers include the aforementioned absorptive polarizing components. Examples of phase retardation films include the aforementioned first phase retardation component and second phase retardation component. The optical film can be a single layer or multiple layers. In one embodiment, the outermost layer on the adhesive component side of the optical film is made of a low-permeability material. Examples of low-permeability materials include cyclic olefin resins and polycarbonate resins. When the adhesive component has an adhesive layer containing an ionic liquid (e.g., an ionic liquid composed of fluorine-containing anions such as bis(fluorosulfonyl)imide anions), if the outermost layer on the adhesive component side of the optical film is made of a low-permeability material, the penetration of the ionic liquid into the optical film can be suppressed. The moisture permeability of the aforementioned low-permeability material at 40℃ × 92%RH is, for example, 10 g / (m³). 2 • 24h) ~ 900g / (m 2 •24h). The permeability can be determined according to the permeability test (permeability cup method) of JIS Z 0208.

[0155] In the manufacture of a display body with a display system, after the release liner is peeled from the optical film with the adhesive component, the optical film with the adhesive layer is pasted. In this embodiment, a display body with an adhesive layer is provided. Using the adhesive component of this embodiment prevents the introduction of foreign matter and allows for the pasting of the optical film. In particular, it is advantageous from the viewpoint of preventing the introduction of minute foreign matter.

[0156] In one embodiment, an optical film with an adhesive component is provided, comprising an optical film including an absorptive polarizing component and the aforementioned adhesive component. This optical film with the adhesive component is preferably used as a polarizing component in a display element, for example, after a release liner can be peeled off. In this embodiment, a display element with an adhesive layer can be provided. The optical film including the absorptive polarizing component may also further include a retardation film.

[0157] Figure 5 This is a schematic cross-sectional view of a lens with an adhesive component according to an embodiment of the present invention. The lens 300 with the adhesive component includes a lens B and an adhesive component 100 disposed on at least one side of the lens B. In this embodiment, a lens with an adhesive layer can be provided. The adhesive component 100 can be configured such that a release liner 120 is located on the opposite side of the lens B. The adhesive component can also be an adhesive component having a conductive layer (i.e.,...). Figure 2 (The adhesive component 100' shown). Examples of lens B include the second lens portion described above and the first lens portion described above.

[0158] Example

[0159] The present invention will be specifically described below through embodiments, but the present invention is not limited to these embodiments.

[0160] [Manufacturing Example 1]

[0161] (Fabrication of absorption-type polarizing film)

[0162] Using a roll stretching machine, a long roll of 30µm thick polyvinyl alcohol (PVA) resin film (manufactured by Kuraray, product name "PE3000") is uniaxially stretched along its long side to make it 5.9 times its original length. Simultaneously, swelling, dyeing, crosslinking, and washing processes are carried out, and finally, drying is performed to produce an absorptive polarizing film with a thickness of 12µm.

[0163] Specifically, the swelling treatment involves extending the film by 2.2 times while being treated in pure water at 20°C. Next, the dyeing treatment involves extending the film by 1.4 times while being treated in an aqueous solution at 30°C containing iodine and potassium iodide in a weight ratio of 1:7, with the iodine concentration adjusted to achieve a monomer transmittance of 45.0% for the resulting absorptive polarizing film. Furthermore, the crosslinking treatment employs a two-stage process. The first stage involves extending the film by 1.2 times while being treated in an aqueous solution containing boric acid and potassium iodide at 40°C. The boric acid content in the first stage crosslinking treatment aqueous solution is 5.0 wt%, and the potassium iodide content is 3.0 wt%. The second stage involves extending the film by 1.6 times while being treated in an aqueous solution containing boric acid and potassium iodide at 65°C. The boric acid content in the second stage crosslinking treatment aqueous solution is 4.3 wt%, and the potassium iodide content is 5.0 wt%. Finally, the washing treatment involves treatment with an aqueous solution of potassium iodide at 20°C. The potassium iodide content in the washing treatment aqueous solution is 2.6 wt%. Finally, the film is dried at 70°C for 5 minutes to obtain an absorptive polarizing film.

[0164] (Fabrication of polarizing components)

[0165] A cellulose triacetate (TAC) resin film (TAC thickness: 25 µm, HC thickness: 7 µm) was laminated as a protective layer on one side of the obtained absorptive polarizing film, and a cyclic olefin resin film (thickness: 13 µm) was laminated as a protective layer on the other side. Specifically, the total thickness of the curable adhesive was applied to approximately 1 µm, and the film was laminated using a rolling mill. Then, UV light was irradiated from the TAC film side to cure the adhesive.

[0166] Thus, a polarizing component consisting of "TAC film (protective layer) / absorption polarizing film / COP film (protective layer)" is obtained.

[0167] [Manufacturing Example 2]

[0168] (Formation of the adhesive layer)

[0169] In a four-necked flask equipped with a stirring blade, thermometer, nitrogen inlet pipe, and cooler, a monomer mixture containing 94.9 parts by weight of butyl acrylate, 5 parts by weight of acrylic acid, and 0.1 parts by weight of 2-hydroxyethyl acrylate was added. Relative to 100 parts by weight of this monomer mixture, 0.3 parts by weight of benzoyl peroxide (as a polymerization initiator) was added together with ethyl acetate. While stirring slowly, nitrogen was introduced to purify the flask, and the liquid temperature was maintained at 60°C for 7 hours for polymerization. Then, ethyl acetate was added to the resulting reaction solution to adjust the solids concentration to 30% by weight, preparing an acrylic polymer solution with a weight average molecular weight (Mw) of 2.2 million.

[0170] An acrylic adhesive was prepared by mixing 0.6 parts by weight of trimethylolpropane / toluene diisocyanate adduct (trade name: Coronate L, manufactured by Tosoh Corporation) and 0.075 parts by weight of silane coupling agent (trade name: KBM403, manufactured by Shin-Etsu Chemical Co., Ltd.) with 100 parts by weight of the solid component of the obtained acrylic polymer solution.

[0171] The obtained acrylic adhesive liquid was applied to the substrate film and the coating film on the substrate film was dried in an oven to form an adhesive layer with a thickness of 15µm.

[0172] [Example 1]

[0173] (Preparation of conductive adhesive composition)

[0174] A monomer mixture containing 75 parts by weight of butyl acrylate (BA), 21 parts by weight of phenoxyethyl acrylate (PEA), 3.3 parts by weight of N-vinyl-2-pyrrolidone (NVP), 0.3 parts by weight of acrylic acid (AA), and 0.4 parts by weight of 4-hydroxybutyl acrylate (HBA) was added to a four-necked flask equipped with a stirring blade, thermometer, nitrogen inlet, and cooler. 0.1 parts by weight of 2,2'-azobisisobutyronitrile (2,2'-azobisisobutyronitrile), used as a polymerization initiator, and 100 parts by weight of ethyl acetate were added to the flask along with 100 parts by weight of the monomer mixture (solid component). Nitrogen was introduced while the mixture was slowly stirred to perform nitrogen purging. The liquid temperature in the flask was maintained at approximately 55°C, and the polymerization reaction was carried out for 8 hours to prepare an acrylic polymer solution.

[0175] In the acrylic polymer liquid obtained above (100 parts by weight of solid component), 5 parts by weight of an ionic compound (organic cationic anionic salt (ionic liquid), 1-ethyl-3-methylimidazolium bis(fluorosulfonyl)imide, manufactured by Daiichi Kogyo Pharmaceutical Co., Ltd.), 0.2 parts by weight of an isocyanate crosslinking agent (manufactured by Mitsui Chemicals Co., Ltd., TAKENATE D160N, trimethylolpropane hexamethylene diisocyanate), 0.3 parts by weight of benzoyl peroxide (manufactured by Nippon Yushu Co., Ltd., NYPER BMT), and a silane coupling agent (manufactured by Shin-Etsu Chemical Co., Ltd.: X-41-1810) were mixed to prepare a conductive adhesive composition containing an adhesive and an antistatic agent.

[0176] (Fabrication of adhesive components)

[0177] The above-mentioned conductive adhesive composition was applied to a release liner (manufactured by Mitsubishi Polyester Film, trade name "MRF38") to obtain an adhesive component consisting of a release liner and a conductive adhesive layer (thickness: 20µm).

[0178] (Fabrication of optical films)

[0179] The adhesive component is deposited onto the polarizing component obtained in Manufacturing Example 1 in such a manner that the COP film of the polarizing component is opposite to the conductive adhesive layer, thereby obtaining an optical film with the adhesive component. A schematic diagram of the structure of the obtained optical film with the adhesive component is shown in Table 1 together with schematic diagrams of the structures of Examples 2 to 5 and Comparative Examples (adhesive layer not shown).

[0180] [Table 1]

[0181] Example 1

[0182]

[0183] Example 2

[0184]

[0185] Example 3

[0186]

[0187] Example 4

[0188]

[0189] Example 5

[0190]

[0191] Comparative Example 1

[0192]

[0193] [Example 2]

[0194] The amount of the ionic compound (organic cationic anionic salt (ionic liquid), 1-ethyl-3-methylimidazolium bis(fluorosulfonyl)imide, manufactured by Daiichi Kogyo Pharmaceutical Co., Ltd.) was set to 0.5 parts by weight, and the optical film with adhesive components was obtained in the same manner as in Example 1.

[0195] [Example 3]

[0196] (Modulation of the composition for forming the conductive layer)

[0197] A conductive layer forming composition with a solid content of 0.5% by weight was prepared by mixing 8.6 parts by weight of a thiophene polymer solution (trade name: Denatron P-580W, manufactured by NagaseChemteX Co.), 1 part by weight of a solution containing an oxazoline-based acrylic polymer (trade name: Epocros WS-700, manufactured by Nippon Catalyst Co.), and 90.4 parts by weight of water.

[0198] The resulting conductive layer forming composition contains 0.04% by weight of a polythiophene polymer and 0.25% by weight of an oxazoline-containing acrylic polymer.

[0199] (Formation of the conductive layer)

[0200] The conductive layer forming composition was applied to the COP film side of the polarizing component to achieve a dried thickness of 50 nm, and then dried at 80°C for 2 minutes to form the conductive layer. The resulting conductive layer contained 8 wt% of a thiophene-based polymer and 50 wt% of an oxazoline-containing acrylic polymer.

[0201] (Fabrication of adhesive components)

[0202] Using the adhesive layer obtained in Manufacturing Example 2, the conductive layer is deposited onto a release liner (manufactured by Mitsubishi Polyester Film Co., Ltd., trade name "MRF38") to obtain an adhesive component consisting of a release liner, an adhesive layer, and a conductive layer.

[0203] (Fabrication of optical films)

[0204] The adhesive component is deposited on the polarizing component obtained in Manufacturing Example 1 in such a way that the COP film of the polarizing component is opposite to the conductive layer, thereby obtaining an optical film with adhesive component (polarizing component / adhesive component (conductive layer / adhesive layer / release liner)).

[0205] [Example 4]

[0206] (Fabrication of adhesive components)

[0207] The adhesive layer obtained in Manufacturing Example 2 was laminated onto a conductive release liner (manufactured by Mitsubishi PolyesterFilm, trade name "MRQ75") to obtain an adhesive component consisting of a conductive release liner and an adhesive layer (thickness: 15µm).

[0208] (Fabrication of optical films)

[0209] The adhesive component is deposited onto the polarizing component obtained in Manufacturing Example 1 in such a way that the COP film of the polarizing component is opposite to the adhesive layer, thereby obtaining an optical film with the adhesive component.

[0210] [Example 5]

[0211] (Fabrication of the conductive layer)

[0212] The conductive layer was obtained in the same manner as in Example 3.

[0213] (Fabrication of adhesive components)

[0214] Using the adhesive layer obtained in Manufacturing Example 2, the conductive layer is laminated onto a conductive release liner (manufactured by Mitsubishi Polyester Film Co., Ltd., trade name "MRQ75") to obtain an adhesive component consisting of a conductive release liner and an adhesive layer (thickness: 15µm).

[0215] (Fabrication of optical films)

[0216] The adhesive component is deposited on the polarizing component obtained in Manufacturing Example 1 in such a way that the COP film of the polarizing component is opposite to the conductive layer, thereby obtaining an optical film with an adhesive component.

[0217] [Comparative Example 1]

[0218] (Fabrication of adhesive components)

[0219] The adhesive layer obtained in Manufacturing Example 2 was laminated onto a release liner (manufactured by Mitsubishi Polyester Film, trade name "MRF38") to obtain an adhesive component consisting of a release liner and an adhesive layer (thickness: 15µm).

[0220] (Fabrication of optical films)

[0221] The adhesive component is deposited onto the polarizing component obtained in Manufacturing Example 1 in such a way that the COP film of the polarizing component is opposite to the adhesive layer, thereby obtaining an optical film with the adhesive component.

[0222] <Foreign object adhesion>

[0223] The optical film peeling backing with adhesive components obtained from the examples and comparative examples was observed using an optical microscope (20x) to measure the number and size of foreign objects in a 20mm × 20mm area. A total of 10 or more observed foreign objects (the total number of foreign objects with a size of 10µm or larger) was rated as × (unacceptable), 5 to 9 as ○ (acceptable (ideal)), and 4 or fewer as ◎ (acceptable (relatively ideal)).

[0224] The release liner was peeled at a peel angle of 180° and a stretching speed of 300 mm / min. The number of foreign matter adhering to the liner was determined 5 minutes after peeling.

[0225] <Surface resistivity>

[0226] The surface resistance of the conductive element (the adhesive layer in Comparative Example 1) was measured using an MCP-HT450 manufactured by Mitsubishi Chemical Analytech. The surface resistance value was measured after 10 seconds under an applied voltage of 250V (Examples 1 and 2) or 10V (Examples 3-5, Comparative Example 1).

[0227] <Battery Charge>

[0228] The release liner was peeled off from the optical films with adhesive components obtained from the examples and comparative examples, and the charge on the adhesive layer and conductive adhesive layer was measured 10 seconds after peeling. The measurement environment was set at 23°C and 55%RH. The peeling conditions were set as peel angle: 180° and stretching speed: 300 mm / min. When measuring the charge, a STATIRON DZ4 from SHISHIDO ELECTROSTATIC, LTD. was used, and the distance from the adhesive layer surface (the side with the release liner) was set to 35 mm.

[0229] Smoothness

[0230] Using the EyeScale-4W manufactured by i-system Co., Ltd., the degree of in-plane unevenness (smoothness) of the adhesive layer was calculated as the ISC value according to the device's standard using the ISC measurement mode of a 3CCD image sensor.

[0231] (Measurement conditions)

[0232] The adhesive layer is a component used as a sample, adhered to an alkali-free glass plate (Corning, 1737). After sequentially setting up the light source, sample, and screen, the transmitted image of the sample projected onto the screen is measured using a CCD camera. The light source and CCD camera are positioned at a distance of 30 cm from the sample (the adhesive layer adhered to the alkali-free glass plate). Alternatively, the light source and CCD camera are positioned at a distance of 100 cm from the screen. The light source and CCD camera are positioned 20 cm away from both the sample and the screen at the same distance.

[0233] The ISC value is related to the assessment of unevenness. If the ISC value is below 100, it can be judged that the unevenness can be controlled and reduced. The smaller the ISC value, the more unevenness can be judged. An ISC value of 50~100 is assessed as ○ (ideal), and below 50 is assessed as ◎ (relatively ideal).

[0234] The results are shown in Table 2.

[0235] [Table 2]

[0236]

[0237] As is evident from Table 2, according to embodiments of the present invention, an adhesive component with minimal foreign matter adhesion during the peeling of the release liner can be provided. The optical film containing this adhesive component (optical film with adhesive component) can be bonded to components constituting VR goggles (e.g., display panels) using the adhesive layer as the bonding surface. Using an adhesive component with minimal foreign matter adhesion allows for the acquisition of VR goggles that prevent display defects.

[0238] Industrial availability

[0239] The adhesive component of this invention can be used in displays such as VR goggles.

[0240] Explanation of reference numerals in the attached figures

[0241] 2: Display System

[0242] 12: Display element

[0243] 14: Reflector

[0244] 16: First lens section

[0245] 18: Semi-reflective mirror

[0246] 20: First phase difference component

[0247] 22: Second phase difference component

[0248] 24: Second lens section

[0249] 100, 100': Adhesive components

[0250] 110: Adhesive layer

[0251] 120: Peeling the gasket

[0252] 130: Conductive layer

Claims

1. An adhesive component comprising an adhesive layer and a release liner disposed on at least one side of the adhesive layer, characterized in that, Under Class 10000 conditions as specified in Federal Standard 209D, the number of foreign objects on the surface of the adhesive layer when the release liner is peeled off from the bonded component is less than 12 within a 20 mm square area. The adhesive component is laminated onto the components that make up the VR goggles for use.

2. The adhesive component as described in claim 1, characterized in that, When the release liner is peeled off, the surface charge of the adhesive layer is less than 4.0 kV.

3. The adhesive component as described in claim 1, characterized in that, It also has a conductive layer. The adhesive component is sequentially provided with the conductive layer, the adhesive layer, and the release liner.

4. The adhesive component as described in claim 1, characterized in that, The adhesive layer contains an antistatic agent.

5. The adhesive component as claimed in claim 1, characterized in that, The release liner contains an antistatic agent.

6. The adhesive component as described in claim 3, characterized in that, The release liner contains an antistatic agent.

7. The adhesive component as claimed in claim 3, characterized in that, The conductive layer contains an antistatic agent.

8. The adhesive component as claimed in claim 4, characterized in that, The antistatic agent is an ionic liquid.

9. An optical film with an adhesive component, characterized in that, An adhesive component comprising any one of claims 1 to 8.

10. A display system for displaying images to a user, characterized in that, have: A display element having a display surface from which light for displaying an image is emitted forward via a polarizing component; A reflective element, disposed in front of the display element, includes a reflective polarizing component that reflects light emitted from the display element; A first lens portion is disposed in the optical path between the display element and the reflective portion; A semi-reflective mirror is disposed between the display element and the first lens portion, allowing light emitted from the display element to be transmitted and causing light reflected by the reflective portion to be reflected back to the reflective portion; A first λ / 4 component is disposed in the optical path between the display element and the semi-reflective mirror; The second λ / 4 component is disposed in the optical path between the semi-reflective mirror and the reflective part. It also has the optical film with adhesive components as described in claim 9.

11. The display system as claimed in claim 10, characterized in that, The display element includes the optical film with adhesive components.

12. A display body, characterized in that, The display system described in claim 10 is provided.

13. A method for manufacturing a display body, characterized in that, The display system described in claim 10 is provided.

14. The method for manufacturing a display body as described in claim 13, characterized in that, The action of applying the optical film with adhesive components as described in claim 9.

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