Light-diffusing gas barrier film and device with light-diffusing gas barrier film

Abstract

The present invention provides a light-diffusing gas barrier film that combines high light transmittance, good light diffusion, and high gas barrier properties, and a device equipped with the same. [Solution] A light-diffusing gas barrier film having an adhesive surface that is attached to an object to be attached, and an outer surface opposite to the adhesive surface, and satisfying the following conditions (i) to (iii). (i) The haze value is 10% or higher. (ii) The total light transmittance is 75% or more. (iii) The water vapor transmission rate under conditions of 90% relative humidity and 40°C is 1.0 × 10⁻⁶ -3 g / m 2 It is less than / day.

Description

[Technical Field]

[0001] The present invention relates to a light-diffusing gas barrier film and a device equipped with a light-diffusing gas barrier film. [Background technology]

[0002] In the field of optical technology, which includes liquid crystal display devices and organic light-emitting devices, the use of light diffusion control films that can strongly diffuse incident light from a specific angular range in a specific direction is being considered. Examples of such light diffusion control films include those having an internal structure within which multiple regions with relatively high refractive indices are located within a region with a relatively low refractive index. More specifically, examples include light diffusion control films having a louver structure in which multiple plate-like regions with different refractive indices are alternately arranged along any one direction along the film surface, and light diffusion control films having a column structure in which multiple columnar objects with relatively high refractive indices are arranged in a forest-like manner within a region with a relatively low refractive index. For example, Patent Document 1 describes an anisotropic light-diffusing film obtained by photocuring a composition for an anisotropic light-diffusing film that includes (A) a (meth)acrylic acid ester containing a plurality of aromatic rings as component (A) and (B) a urethane (meth)acrylate having a weight-average molecular weight in the range of 7,000 to 13,000 as component (B). [Prior art documents] [Patent Documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2016-200841 [Overview of the Initiative] [Problems that the invention aims to solve]

[0004] As light-diffusing films, such as the light-diffusing control films and anisotropic light-diffusing films mentioned above, become more widespread, there is a growing need for devices equipped with these light-diffusing films to possess high gas barrier properties so that they can withstand use in a variety of environments. However, conventionally proposed light-diffusing films do not possess sufficient gas barrier properties, and there was room for improvement.

[0005] In view of the above problems, the present invention aims to provide a light-diffusing gas barrier film that combines high light transmittance, good light diffusion, and high gas barrier properties, and a device equipped with the light-diffusing gas barrier film using the same. [Means for solving the problem]

[0006] The inventors of the present invention have conducted extensive research to solve the above problems and have found that it is possible to produce a light-diffusing gas barrier film that satisfies a predetermined set of physical properties, and that said light-diffusing gas barrier film can solve the above problems, thereby completing the present invention. In other words, the present invention provides the following [1] to [5].

[0007] [1] A light-diffusing gas barrier film having an adhesive surface that is applied to an object to be attached, and an outer surface opposite to the adhesive surface, and satisfying the following conditions (i) to (iii). (i) The haze value is 10% or higher. (ii) The total light transmittance is 75% or more. (iii) The water vapor transmission rate under conditions of 90% relative humidity and 40°C is 1.0 × 10⁻⁶ -3 g / m 2 It is less than / day. [2] Having a gas barrier layer and a light diffusion layer, The gas barrier film according to [1] above, wherein the light diffusing layer is located on the outer side with respect to the gas barrier layer. [3] The light diffusion layer is a light diffusion control layer having a plurality of high refractive index regions extending in the thickness direction and a low refractive index region covering the periphery of the high refractive index region and having a lower refractive index than the high refractive index region. The light-diffusing gas barrier film according to [2] above. [4] The light-diffusing gas barrier film according to [2] or [3] above, wherein the gas barrier layer has a modified region. [5] A device with a light-diffusing gas barrier film, comprising the light-diffusing gas barrier film according to any one of [1] to [4] above and a device body, wherein the sticking surface of the light-diffusing gas barrier film is stuck to the sticking target surface of the device body.

Advantages of the Invention

[0008] According to the present invention, there are provided a light-diffusing gas barrier film having high light transmittance, good light diffusibility, and high gas barrier properties, and a device with a light-diffusing gas barrier film using the same.

Brief Description of the Drawings

[0009] [Figure 1] It is a schematic cross-sectional view showing an example of the light-diffusing gas barrier film. [Figure 2] It is a schematic cross-sectional view showing another example of the light-diffusing gas barrier film. [Figure 3] It is a schematic cross-sectional view showing another example of the light-diffusing gas barrier film. [Figure 4] It is a schematic cross-sectional view showing another example of the light-diffusing gas barrier film. [Figure 5] It is a schematic cross-sectional view showing another example of the light-diffusing gas barrier film. [Figure 6] It is a schematic cross-sectional view showing an example of the device with a light-diffusing gas barrier film.

Embodiments for Carrying Out the Invention

[0010] In this specification, any provision deemed preferable can be selected at will, and any combination of preferred provisions is considered more preferable. In this specification, the notation "XX~YY" means "XX or greater and YY or less". In this specification, the lower and upper limits described in steps for a preferred numerical range (e.g., range of content) can be combined independently. For example, from the description "preferably 10 to 90, more preferably 30 to 60," the "preferred lower limit (10)" and the "more preferred upper limit (60)" can be combined to arrive at "10 to 60." In this specification, for example, "(meth)acrylic acid" refers to both "acrylic acid" and "methacrylic acid," and the same applies to other similar terms. In this specification, the property of suppressing the permeation of water vapor and oxygen is referred to as "gas barrier property," and a film having gas barrier property is referred to as a "gas barrier film." In this specification, "solids" means components other than the solvent in the coating solution. For the sake of clarity, diagrams will be used in various places, but the present invention is not limited to what is shown in the diagrams. Also, each diagram is a schematic diagram and is shown with exaggerated dimensions compared to the actual dimensions for the sake of clarity. Unless otherwise specified, the upper surface of each cross-sectional view will be referred to as the "top surface," and the lower surface of each cross-sectional view will be referred to as the "bottom surface." Furthermore, the side of the light-diffusing gas barrier film that is attached to the object to be attached will be referred to as the "attachment surface," and the side of the light-diffusing gas barrier film opposite the attachment surface will be referred to as the "outer surface." The following describes an embodiment of the present invention (which may be referred to as "this embodiment") of a light-diffusing gas barrier film and a device with a light-diffusing gas barrier film using the same.

[0011] 1. Light-diffusing gas barrier film A light-diffusing gas barrier film according to one or more embodiments of the present invention has an adhesive surface that is attached to an object to be attached, and an outer surface opposite to the adhesive surface, and satisfies the following conditions (i) to (iii). (i) The haze value is 10% or higher. (ii) The total light transmittance is 75% or more. (iii) The water vapor transmission rate under conditions of 90% relative humidity and 40°C is 1.0 × 10⁻⁶ -3 g / m 2 It is less than / day.

[0012] In the light-diffusing gas barrier film according to this embodiment, good light diffusion can be obtained by satisfying the above condition (i). Furthermore, high light transmittance can be obtained by satisfying the above condition (ii). Moreover, high gas barrier properties can be obtained by satisfying the above condition (iii). Conventional light-diffusing films have not been sufficiently considered from the viewpoint of gas barrier properties, and it has been difficult for devices to which conventional light-diffusing films are attached to exhibit sufficient gas barrier properties even when used in, for example, a humid and hot environment. As a result of various studies, the inventors of the present invention have found that it is possible to produce a light-diffusing gas barrier film that simultaneously satisfies the above conditions (i) to (iii), as shown in the examples described later, and have arrived at the present invention.

[0013] The above-described light-diffusing gas barrier film has a gas barrier layer and a light-diffusing layer, and it is preferable that the light-diffusing layer is located on the outer side relative to the gas barrier layer. This configuration makes it easier to achieve both gas barrier properties and light-diffusing properties, and also makes it easier to enhance the gas barrier properties.

[0014] 1-1. Example of a light-diffusing gas barrier film configuration Figure 1 shows a specific example of the configuration of a light-diffusing gas barrier film according to an embodiment of the present invention. Figure 1(a) is a cross-sectional view of the light-diffusing gas barrier film 100A according to an embodiment of the present invention. The light-diffusing gas barrier film 100A comprises a gas barrier layer 10 and a light-diffusing layer 20 that are laminated in order. In the light-diffusing gas barrier film 100A, the side of the gas barrier layer 10 opposite to the light-diffusing layer 20 (i.e., the bottom surface of the gas barrier layer 10 in Figure 1(a)) is the adhesive surface S1 that is attached to the object to be attached. The side of the light-diffusing layer 20 opposite to the gas barrier layer 10 is referred to as the outer surface S2. In the following light-diffusing gas barrier films as well, the side opposite to the adhesive surface S1 is also referred to as the outer surface S2.

[0015] Figure 1(b) is a cross-sectional view of a light-diffusing gas barrier film 100A' according to an embodiment of the present invention. The light-diffusing gas barrier film 100A' has the same configuration as the light-diffusing gas barrier film 100A, except that it has an adhesive layer 40 on the adhesive side (i.e., the side of the gas barrier layer 10 opposite to the light-diffusing layer 20) which is an adhesive layer for attaching to the object to be attached. In the light-diffusing gas barrier film 100A', the side of the adhesive layer 40 opposite to the gas barrier layer 10 (i.e., the lower surface of the adhesive layer 40 in Figure 1(b)) is the adhesive surface S1 that is attached to the object to be attached. Because the light-diffusing gas barrier film 100A' has an adhesive layer 40, the light-diffusing gas barrier film 100A' can be easily attached to the object to be attached.

[0016] The light-diffusing gas barrier films 100A and 100A' are lightweight and easy to enhance in terms of light transmittance due to their simple construction.

[0017] The light-diffusing gas barrier film 100A can be manufactured by (I) a manufacturing method comprising the step of supplying a gas barrier layer-forming composition onto the light-diffusing layer and forming the gas barrier layer on the light-diffusing layer, or (II) a manufacturing method comprising the step of supplying a light-diffusing layer-forming composition onto the gas barrier layer and forming the gas barrier layer on the light-diffusing layer. In (I) above, a substrate having a release layer may be used, and a laminate having a light-diffusing layer may be formed by supplying a light-diffusing layer-forming composition onto the release layer, after which the gas barrier layer may be formed, and then the substrate may be removed. Alternatively, in (II) above, a substrate having a release layer may be used, and a laminate having a gas barrier layer may be formed by supplying a gas barrier layer-forming composition onto the release layer, after which the light-diffusing layer may be formed, and then the substrate may be removed. Furthermore, the light-diffusing gas barrier film 100A' can be manufactured by forming an adhesive layer on the exposed surface of the gas barrier layer 10 of the light-diffusing gas barrier film 100A obtained by the manufacturing method of (I) or (II) described above.

[0018] Figures 2(a) and 2(b) are cross-sectional views of light-diffusing gas barrier films 100B and 100B' according to other embodiments of the present invention. The light-diffusing gas barrier film 100B shown in Figure 2(a) further comprises a base film 30 in addition to the configuration of the light-diffusing gas barrier film 100A. The base film 30 is located on the adhesive side of the gas barrier layer 10. In the light-diffusing gas barrier film 100B, the lower surface of the base film 30 is the adhesive surface S1. The light-diffusing gas barrier film 100B' shown in Figure 2(b) has the same configuration as the light-diffusing gas barrier film 100B, except that it has an adhesive layer 40, which is an adhesive layer for application, on the application side (i.e., the side of the gas barrier layer 10 opposite to the light-diffusing layer 20).

[0019] Because the light-diffusing gas barrier films 100B and 100B' include a base film 30, their rigidity can be easily increased and they are easy to manufacture.

[0020] The light-diffusing gas barrier film 100B can be manufactured by a method comprising the steps of supplying a gas barrier layer-forming composition onto one surface of a base film 30 to form a gas barrier layer 10 on the base film 30, and supplying a light-diffusing layer-forming composition onto the surface of the gas barrier layer 10 opposite to the base film 30 to form a light-diffusing layer 20 on the gas barrier layer 10. Furthermore, the light-diffusing gas barrier film 100B' can be manufactured by forming an adhesive layer on the exposed surface of the base film 30 of the light-diffusing gas barrier film 100B obtained by the above manufacturing method.

[0021] Figures 3(a) and 3(b) are cross-sectional views of light-diffusing gas barrier films 100C and 100C' according to other embodiments of the present invention. The light-diffusing gas barrier film 100C shown in Figure 3(a) has a different layering order from the light-diffusing gas barrier film 100B, with the gas barrier layer 10, base film 30, and light-diffusing layer 20 being laminated in that order. In the light-diffusing gas barrier film 100C, the lower surface of the gas barrier layer 10 is the adhesive surface S1. The light-diffusing gas barrier film 100C' shown in Figure 3(b) has the same configuration as the light-diffusing gas barrier film 100C, except that it has an adhesive layer 40, which is an adhesive layer for adhesion, on the adhesive side (i.e., the side of the gas barrier layer 10 opposite to the base film 30).

[0022] Because the light-diffusing gas barrier films 100C and 100C' include a base film 30, their rigidity is easily increased and they are easy to manufacture. In addition, since the base film 30 is located between the gas barrier layer 10 and the light-diffusing layer 20, the compatibility of the adhesion between the gas barrier layer 10 and the light-diffusing layer 20 is not a concern, thus providing a high degree of freedom in selecting materials for both.

[0023] The light-diffusing gas barrier film 100C can be manufactured by a method comprising the steps of supplying a light-diffusing layer-forming composition onto one surface of the base film to form the light-diffusing layer on the base film, and supplying a gas barrier layer-forming composition onto the other surface of the base film to form the gas barrier layer on the base film. Furthermore, the light-diffusing gas barrier film 100C' can be manufactured by forming an adhesive layer on the exposed surface of the gas barrier layer of the light-diffusing gas barrier film 100C obtained by the above manufacturing method.

[0024] Figures 4(a) and 4(b) are cross-sectional views of light-diffusing gas barrier films 100D and 100D' according to other embodiments of the present invention. The light-diffusing gas barrier film 100D shown in Figure 4(a) comprises a first base film 31, a gas barrier layer 10, an adhesive layer 41, a second base film 32, and a light-diffusing layer 20 in this order. In the light-diffusing gas barrier film 100D, the lower surface of the first base film 31 is the adhesive surface S1. The light-diffusing gas barrier film 100D' shown in Figure 4(b) has the same configuration as the light-diffusing gas barrier film 100D, except that it has an adhesive layer 40, which is an adhesive layer for application, on the application side (i.e., the side of the first base film 31 opposite to the gas barrier layer 10).

[0025] The light-diffusing gas barrier films 100D and 100D' are easier to manufacture with increased rigidity because they consist of two base films 31 and 32. Furthermore, since they are manufactured by attaching a laminate in which the light-diffusing layer 20 is laminated on a second base film 32 to the upper surface (the side of the gas barrier layer 10 opposite to the first base film 31) of a laminate in which the gas barrier layer 10 is laminated on a first base film 31 using an adhesive layer 41, productivity can be increased. In addition, since the compatibility of adhesion between the gas barrier layer 10 and the light-diffusing layer 20 is not a concern, there is a high degree of freedom in selecting the materials for both.

[0026] The light-diffusing gas barrier film 100D can be manufactured by a method comprising the steps of: supplying a light-diffusing layer-forming composition onto a first substrate film to form the light-diffusing layer on the first substrate film; supplying a gas barrier layer-forming composition onto a second substrate film to form the gas barrier layer on the second substrate film; and placing an adhesive layer between the surface of the first substrate film opposite to the surface on which the light-diffusing layer is formed and the gas barrier layer. Furthermore, the light-diffusing gas barrier film 100D' can be manufactured by forming an adhesive layer on the exposed surface of the first base film of the light-diffusing gas barrier film 100D obtained by the above manufacturing method.

[0027] Figures 5(a) and 5(b) are cross-sectional views of light-diffusing gas barrier films 100E and 100E' according to other embodiments of the present invention. The light-diffusing gas barrier film 100E shown in Figure 5(a) comprises a gas barrier layer 10, a first base film 31, an adhesive layer 41, a second base film 32, and a light-diffusing layer 20 in this order. In the light-diffusing gas barrier film 100E, the lower surface of the gas barrier film 10 is the adhesive surface S1. The light-diffusing gas barrier film 100E' shown in Figure 5(b) has the same configuration as the light-diffusing gas barrier film 100E, except that it has an adhesive layer 40, which is an adhesive layer for application, on the application side (i.e., the side of the gas barrier film 10 opposite to the first base film 31).

[0028] The light-diffusing gas barrier films 100E and 100E' are easier to manufacture with increased rigidity because they consist of two base films 31 and 32. Furthermore, since they are manufactured by attaching a laminate in which a light-diffusing layer 20 is laminated on a second base film 32 to the back surface (the side of the first base film 31 opposite to the gas barrier layer 10) of a laminate in which a gas barrier layer 10 is laminated on a first base film 31 using an adhesive layer 41, productivity can be increased. In addition, since the compatibility of adhesion between the gas barrier layer 10 and the light-diffusing layer 20 is not a concern, there is a high degree of freedom in selecting the materials for both.

[0029] The light-diffusing gas barrier film 100E can be manufactured by a method comprising the steps of: supplying a light-diffusing layer-forming composition onto a first substrate film to form the light-diffusing layer on the first substrate film; supplying a gas barrier layer-forming composition onto a second substrate film to form the gas barrier layer on the second substrate film; and placing an adhesive layer between the surface of the first substrate film opposite to the surface on which the light-diffusing layer is formed and the surface of the second substrate film opposite to the surface on which the gas barrier layer is formed. Furthermore, the light-diffusing gas barrier film 100E' can be manufactured by forming an adhesive layer on the exposed surface of the gas barrier layer of the light-diffusing gas barrier film 100E obtained by the above manufacturing method.

[0030] In the above condition (i), the haze value of the light-diffusing gas barrier film is preferably 15% or more, more preferably 20% or more, even more preferably 30% or more, and particularly preferably more than 30%, from the viewpoint of obtaining higher light diffusion. There is no particular upper limit to the above haze value, but from the viewpoint of visibility when attached to the device body, for example it is 50%. The above haze value can be set to the above numerical range primarily by providing a light diffusion layer, as described later. The above haze values ​​were measured in accordance with JIS K 7136:2000, and in detail, they were measured by the method described in the examples.

[0031] In the above condition (ii), the total light transmittance of the light-diffusing gas barrier film is preferably 78% or higher, more preferably 80% or higher, even more preferably 82% or higher, and particularly preferably 85% or higher, from the viewpoint of obtaining higher light transmittance. There is no particular upper limit, and it can be 100%. The total light transmittance of the above-mentioned light-diffusing gas barrier film can be set to the above numerical range mainly by forming a light-diffusing layer and a gas barrier layer that satisfies the following requirements (1) and (2). The total light transmittance described above is measured by the method described in the examples.

[0032] In the above condition (iii), from the viewpoint of ensuring higher gas barrier properties, the water vapor transmission rate of the light-diffusing gas barrier film in an atmosphere of 40°C and 90% relative humidity is preferably 9.0×10 -4 g / m 2 / day or less, more preferably 8.0×10 -4 g / m 2 / day or less, still more preferably 7.0×10 -4 g / m 2 / day or less, even more preferably 6.0×10 -4 g / m 2 / day or less. The water vapor transmission rate of the light-diffusing gas barrier film can be set within the above numerical range mainly by forming a gas barrier layer that satisfies the requirements (1) and (2) described below. The water vapor transmission rate is measured by a known method, specifically, the method described in the examples.

[0033] The thickness of the light-diffusing gas barrier film can be appropriately determined according to the intended use of the electronic device and the like. From the viewpoint of handling properties, the thickness of the light-diffusing gas barrier film is preferably 10 to 1,000 μm, more preferably 30 to 200 μm, and still more preferably 50 to 150 μm.

[0034] 1-2. Light-diffusing layer Examples of the light-diffusing layer include a light-diffusion control layer that can diffuse or transmit incident light depending on the incident angle, and an antiglare hard coat layer that can suppress regular reflection of external light and prevent reflection of external light.

[0035] (1) Light-diffusion control layer The light-diffusion control layer has an internal structure including a plurality of regions with relatively high refractive indices in a region with a relatively low refractive index. The light-diffusion control layer preferably has an internal structure in which a plurality of regions with relatively high refractive indices extend in the thickness direction in a region with a relatively low refractive index inside. In other words, in a preferred embodiment of the light-diffusing gas barrier film according to the present invention, the light-diffusing layer is a light-diffusing control layer having a plurality of high-refractive-index regions extending in the thickness direction and low-refractive-index regions covering the periphery of the high-refractive-index regions and having a lower refractive index than the high-refractive-index regions.

[0036] One example of such an internal structure is a column structure in which multiple columnar objects with relatively high refractive indices are arranged in the thickness direction within a region with a relatively low refractive index. Another example is a louver structure in which multiple plate-like regions with different refractive indices are alternately arranged in one arbitrary direction along the main surface of the light diffusion control layer.

[0037] (1-1) Configuration of the light diffusion control layer The specific configuration and composition of the light diffusion control layer are not particularly limited, and conventionally known ones can be used. A preferred example of a light diffusion control layer is one obtained by curing a composition for a light diffusion control layer that contains a high refractive index component having one or two polymerizable functional groups and a low refractive index component having a lower refractive index than the high refractive index component and also having one or two polymerizable functional groups. By using such a high refractive index component and a low refractive index component, it becomes easier to form the above-mentioned internal structure well.

[0038] Preferred examples of the above-mentioned high refractive index component include (meth)acrylic acid esters containing aromatic rings. Examples of (meth)acrylic acid esters containing multiple aromatic rings include (meth)acrylic acid biphenyl, (meth)acrylic acid naphthyl, (meth)acrylic acid anthrasyl, (meth)acrylic acid benzylphenyl, (meth)acrylic acid biphenyloxyalkyl, (meth)acrylic acid naphthyloxyalkyl, (meth)acrylic acid anthrasyloxyalkyl, and (meth)acrylic acid benzylphenyloxyalkyl, as well as those in which some of these are substituted with halogens, alkyls, alkoxys, alkyl halides, etc.

[0039] The weight-average molecular weight of the high refractive index component is preferably 150 to 2,500. Having the weight-average molecular weight of the high refractive index component within this range facilitates the formation of a light-diffusion control layer with a desired internal structure. Note that the weight-average molecular weight used herein is the value on a standard polystyrene basis, measured by gel permeation chromatography (GPC).

[0040] The refractive index of the high refractive index component is preferably 1.45 or higher, more preferably 1.50 or higher, and even more preferably 1.56 or higher. Furthermore, the refractive index of the high refractive index component is preferably 1.70 or lower, particularly preferably 1.65 or lower, and even more preferably 1.59 or lower. Having the refractive index of the high refractive index component within the above range facilitates the formation of a light diffusion control layer having the desired internal structure. In this specification, the refractive index refers to the refractive index of a predetermined component before curing the light diffusion control layer composition, and the refractive index is measured in accordance with JIS K0062:1992.

[0041] The content of the high refractive index component in the light diffusion control layer composition is preferably 25 to 400 parts by mass per 100 parts by mass of the low refractive index component. When the content of the high refractive index component is within this range, the internal structure of the formed light diffusion control layer will have regions derived from the high refractive index component and regions derived from the low refractive index component in a desired ratio, and as a result, the light diffusion control layer will be able to easily achieve the desired light diffusion properties.

[0042] Preferred examples of the low refractive index component include urethane (meth)acrylate, (meth)acrylic polymers having (meth)acryloyl groups in their side chains, (meth)acryloyl group-containing silicone resins, and unsaturated polyester resins.

[0043] The above urethane (meth)acrylate is preferably formed from (a) a compound containing at least two isocyanate groups, (b) a polyalkylene glycol, and (c) a hydroxyalkyl (meth)acrylate.

[0044] Preferred examples of compounds containing at least two isocyanate groups as described above include aromatic polyisocyanates such as 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, 1,3-xylylene diisocyanate, and 1,4-xylylene diisocyanate; aliphatic polyisocyanates such as hexamethylene diisocyanate; alicyclic polyisocyanates such as isophorone diisocyanate (IPDI) and hydrogenated diphenylmethane diisocyanate; their biuret and isocyanurate derivatives; and adduct derivatives (e.g., xylylene diisocyanate-based trifunctional adduct derivatives) obtained by reaction with low molecular weight active hydrogen-containing compounds such as ethylene glycol, propylene glycol, neopentyl glycol, trimethylolpropane, and castor oil.

[0045] Preferred examples of the (b) polyalkylene glycols mentioned above include polyethylene glycol, polypropylene glycol, polybutylene glycol, and polyhexylene glycol.

[0046] (b) The weight-average molecular weight of the polyalkylene glycol is preferably 2,300 to 19,500.

[0047] Preferred examples of the above-mentioned (c) hydroxyalkyl (meth)acrylate include 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate, 2-hydroxybutyl (meth)acrylate, 3-hydroxybutyl (meth)acrylate, and 4-hydroxybutyl (meth)acrylate.

[0048] The synthesis of urethane (meth)acrylate using the components (a) to (c) described above can be carried out according to conventional methods. In this case, from the viewpoint of efficiently synthesizing urethane (meth)acrylate, the mixing ratio of components (a) to (c) is preferably in the molar ratio of component (a):component (b):component (c) = 1 to 5:1:1 to 5.

[0049] The weight-average molecular weight of the low refractive index component is preferably 3,000 to 20,000. Having the weight-average molecular weight of the low refractive index component within this range facilitates the formation of a light diffusion control layer with desired performance.

[0050] The refractive index of the low refractive index component is preferably 1.30 to 1.59. Having the refractive index of the low refractive index component within this range makes it easier to form the desired light diffusion control layer.

[0051] The above-described light diffusion control layer composition may contain other additives in addition to the high refractive index component and the low refractive index component. Examples of other additives include polyfunctional monomers (compounds having three or more polymerizable functional groups), photopolymerization initiators, antioxidants, ultraviolet absorbers, antistatic agents, polymerization accelerators, polymerization inhibitors, infrared absorbers, plasticizers, diluent solvents, and leveling agents.

[0052] The light diffusion control layer composition can be prepared by uniformly mixing the aforementioned high refractive index and low refractive index components, as well as other additives as desired. During mixing, the mixture may be heated to a temperature of 40-80°C while stirring to obtain a uniform light diffusion control layer composition. Alternatively, a diluent solvent may be added and mixed to achieve the desired viscosity of the resulting light diffusion control layer composition.

[0053] (1-2) Thickness of the light diffusion control layer In this embodiment, the thickness of the light diffusion control layer is preferably 20 to 700 μm. Having the light diffusion control layer within this range makes it easier to achieve the desired light diffusion properties and also helps to suppress the occurrence of dents.

[0054] (1-3) Ratio of internal structure in the thickness direction of the light diffusion control layer As described above, the light diffusion control layer preferably has an internal structure in which multiple regions with relatively high refractive indices are extended in the thickness direction within a region with a relatively low refractive index. Here, the proportion of the internal structure extending in the thickness direction is preferably 10% or more of the thickness of the light diffusion control layer, from the viewpoint of making light diffusion more efficient. There is no upper limit, and the internal structure may be formed in 100%, i.e., the entire thickness direction.

[0055] (2) Anti-glare hard coat layer To form the anti-glare hard coat layer, which serves as the light-diffusing layer in the above-mentioned light-diffusing gas barrier film, a hard coat layer forming material having the following composition is used.

[0056] (2-1) Hard coat layer forming material The hard coat layer forming material described above contains (A) an active energy ray-sensitive composition, (B) spherical organic fine particles, and (C) a dispersant having at least one polar group in its molecule.

[0057] (A) Active energy ray-sensitive composition In the hard coat layer forming material, the active energy ray-sensitive composition used as component (A) includes (a) at least one selected from the group consisting of polyfunctional (meth)acrylate monomers and (meth)acrylate prepolymers that are active energy ray-curable compounds, and (b) silica-based fine particles. In this specification, "active energy beams" refer to electromagnetic waves or charged particle beams that have energy quanta, such as ultraviolet rays or electron beams.

[0058] (B) Spherical organic fine particles In the hard coat layer forming material described above, examples of spherical organic fine particles used as component (B) include silicone-based fine particles, melamine-based resin fine particles, acrylic-based resin fine particles, acrylic-styrene copolymer fine particles, polycarbonate-based fine particles, polyethylene-based fine particles, polystyrene-based fine particles, and benzoguanamine-based resin fine particles. These are preferably spherical with a narrow particle size distribution. From the viewpoint of anti-glare performance, the average particle size of these spherical organic fine particles is preferably 6 to 10 μm. The method for measuring this average particle size will be described later. The spherical organic fine particles of component (B) may be used individually or in combination of two or more types. From the viewpoint of anti-glare performance, the amount of fine particles used is preferably 0.1 to 30 parts by mass per 100 parts by mass of the solid content of the active energy ray-sensitive composition which is component (A) described above. The cured product of the active energy ray-sensitive composition, which is component (A) as described above, and the spherical fine particles, which are component (B), can be selected to have various refractive index differences depending on the purpose. For example, when the anti-glare hard coat layer is of the high-contrast type, it is preferable that the absolute value of the refractive index difference be small so that internal haze does not occur, for example, 0 to 0.03. Also, when the anti-glare hard coat layer is of the general-purpose type, it is preferable that it be 0.03 to 0.2 in order to control the occurrence of internal haze.

[0059] (C) Dispersant In the hard coat layer forming material described above, the dispersant used as component (C) has at least one polar group in its molecule, and examples of such polar groups include carboxyl groups, hydroxyl groups, sulfo groups, primary amino groups, secondary amino groups, tertiary amino groups, amide groups, quaternary ammonium bases, pyridium bases, sulfonium bases, and phosphonium bases. These polar groups may be introduced individually or in multiples within the molecule. When a molecule has multiple polar groups, a component is needed to bond the organic compounds containing each polar group together. Polyoxyalkylene glycol is one such component. While the molecular weight of such a component is not particularly limited, it can be selected from a wide range, from several hundred to several hundred thousand. This dispersant, having at least one polar group in its molecule, suppresses the sedimentation of spherical organic particles in a hard coat layer where the film thickness is greater than the average particle size of the spherical organic particles, allowing the particles to be more abundant near the surface of the hard coat layer, thereby improving anti-glare performance.

[0060] Furthermore, as a specific example of a polar group in the dispersant, a polar group derived from an N,N-dialkylamino group having 1 to 8 carbon atoms in the alkyl group can be cited. Specific examples of the aforementioned N,N-dialkylaminoalkanols include N,N-dimethylaminoethanol, N,N-diethylaminoethanol, N,N-dipropylaminoethanol, N,N-dibutylaminoethanol, N,N-dipentylaminoethanol, and N,N-dihexylaminoethanol, as well as compounds obtained by replacing the ethanol portion of these compounds with propanol or butanol. The two alkyl groups in the dialkyl portion may be the same or different. Examples of dispersants having polar groups derived from N,N-dialkylaminoalkanols include N,N-dialkylaminoalkanol-modified polyoxyalkylene glycols.

[0061] The dispersant of component (C) may be used alone or in combination of two or more types. Furthermore, the amount added is preferably 0.01 to 10 parts by mass per 100 parts by mass of the solid content of the active energy ray-sensitive composition which is component (A) described above, from the viewpoint of balancing the anti-glare properties, scratch resistance, other physical properties, and economic efficiency of the hard coat layer.

[0062] (Photopolymerization initiator) The hard coat layer forming material described above may optionally contain a photopolymerization initiator. Examples of such photopolymerization initiators include benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin-n-butyl ether, benzoin isobutyl ether, acetophenone, dimethylaminoacetophenone, and 2,2-dimethoxy-2-phenylacetophenone. These may be used individually or in combination of two or more, and the amount used is usually selected in the range of 0.2 to 10 parts by mass per 100 parts by mass of the total active energy ray curable compound. Here, the total active energy ray curable compound refers to (b) silica-based fine particles, and if reactive silica fine particles are used, it refers to those containing them.

[0063] (Preparation of hard coat layer forming material) The hard coat layer forming material described above can be prepared by adding, if necessary, the active energy ray-sensitive composition of component (A), spherical organic fine particles of component (B), a dispersant of component (C), and at least one of the optional photopolymerization initiators and various additives, such as antioxidants, ultraviolet absorbers, silane coupling agents, light stabilizers, leveling agents, and defoamers, in a suitable solvent in predetermined proportions, and dissolving or dispersing them.

[0064] 1-3. Base film Various resin films can be used as the base film, and preferably, for example, polyethylene terephthalate (PET) film, polybutylene terephthalate (PBT) film, polylactic acid (PLA) film, polycarbonate film, cycloolefin film, and cellulose film are used. These base films are readily available at low cost and have good light transmittance. The base film may have at least one layer on its surface selected from the group consisting of, for example, a layer to enhance adhesion to the layer formed on the base film (anchor layer), an oligomer deposition prevention layer, a slip-resistant layer, an antistatic layer, and a hard coat layer. For example, it may be treated to enhance adhesion by corona treatment or flame treatment. The base film may be one that has not undergone heat-resistant treatment (e.g., annealing treatment) or one that has undergone heat-resistant treatment.

[0065] 1-4. Gas barrier layer From the viewpoint of ensuring high gas barrier properties at a low cost, the above-mentioned light-diffusing gas barrier film preferably has a gas barrier layer containing silicon and oxygen. Preferably, the gas barrier layer is formed from a coating film of a composition containing a polysilazane compound, as described later. Furthermore, it is preferable that the gas barrier layer has a first region (high nitrogen-containing region) in the thickness direction that contains silicon, oxygen, and nitrogen, and has a higher nitrogen content than other regions.

[0066] As described later, the first region is formed by the reforming process and has a relatively higher nitrogen content compared to the second region, which is the region other than the first region. For this reason, in the following explanation, the first region may also be referred to as the "reformed region" or the "high nitrogen content region." The second region may also be referred to as the "unreformed region" or the "low nitrogen content region." The "high nitrogen content region" refers to a region that remains stable over time and whose thickness does not decrease over time. Therefore, a preferred embodiment of the light-diffusing gas barrier film of the present invention is one in which the gas barrier layer has a modified region.

[0067] The above-mentioned gas barrier layer preferably has a modified region containing silicon, oxygen, and nitrogen in its thickness direction and satisfies the following requirements (1) and (2). Requirement (1): The composition of the first region above is SiO x N y It is represented as follows. x: 0.1~1.5 y: 0.2~0.7 Requirement (2): Thickness d of the above-mentioned modified region M It is 10 nm or larger.

[0068] The above thickness M From the viewpoint of improving gas barrier properties, the wavelength is preferably 30 nm or greater. There is no particular upper limit, but from the viewpoint of ease of manufacturing, it is preferably 300 nm or less.

[0069] The above-mentioned high nitrogen-containing region may be located on the outermost surface of the gas barrier layer or within the gas barrier layer. From the viewpoint of exhibiting good gas barrier properties and ease of manufacturing, it is preferable that it be located on the outermost surface of the gas barrier layer.

[0070] Multiple high-nitrogen-containing regions may exist in the depth direction. If multiple high-nitrogen-containing regions are present, their total thickness must be 10 nm or more. From the viewpoint of preventing water vapor permeation from the edges, it is preferable that one of the multiple high nitrogen-containing regions is located on the outermost surface of the gas barrier layer on the adhesive side. Furthermore, a gas barrier layer having multiple high nitrogen-containing regions in the depth direction can be obtained, for example, by repeatedly forming a gas barrier precursor layer for the formation of the gas barrier layer and performing the reforming treatment described later.

[0071] In the depth direction of the gas barrier layer described above, the elemental ratio of nitrogen atoms can be made to change gradually and continuously from the outermost surface by forming a high nitrogen-containing region through a reforming treatment, as will be described later. Furthermore, in the change in the elemental ratios of silicon, oxygen, and nitrogen in the thickness direction of the gas barrier layer, there may be regions where the elemental ratio of nitrogen is higher than in the deeper parts.

[0072] In the above-mentioned light-diffusing gas barrier film, the thickness d of the gas barrier layer is determined from the viewpoint of ensuring high gas barrier properties and light transmittance, as well as good flexibility, and from the viewpoint of ease of manufacturing. G And the thickness d of the above modified region. M However, 1.00≧d M / d G It is preferable that the relationship ≥ 0.01 is satisfied.

[0073] Thickness d of the gas barrier layer G From the viewpoint of ensuring gas barrier properties, light transmittance, and flexibility, as well as ease of manufacturing, the wavelength is preferably 30 to 1,500 nm. Thickness d of the gas barrier layer G Even at the nanoscale, by providing a high nitrogen content region, a light-diffusing gas barrier film with sufficient gas barrier performance can be obtained.

[0074] Each of the above thicknesses d G d M This can be achieved by forming a gas barrier layer according to the method described later, and by adjusting the composition of the coating solution and the conditions of the modification treatment.

[0075] The above-mentioned gas barrier layer is formed from a gas barrier precursor layer, and is preferably formed from a layer obtained by drying a coating film of a polysilazane compound (hereinafter also referred to as "coating liquid for gas barrier precursor layer") which serves as the gas barrier precursor layer. The above-mentioned high nitrogen-containing region can be formed by a modification treatment described later.

[0076] Examples of polysilazane compounds include inorganic polysilazanes and organic polysilazanes. Examples of inorganic polysilazanes include perhydropolysilazanes, and examples of organic polysilazanes include compounds in which some or all of the hydrogen atoms of perhydropolysilazane are substituted with organic groups such as alkyl groups. Among these, inorganic polysilazanes are more preferred from the viewpoint of ease of availability and the ability to form a gas barrier layer with excellent gas barrier properties. Furthermore, polysilazane compounds can also be used as is, for example, commercially available products sold as glass coating materials. Polysilazane compounds can be used individually or in combination of two or more.

[0077] A method for forming a layer obtained by applying and drying a coating solution for a gas barrier precursor layer includes, for example, applying a coating solution for a gas barrier precursor layer containing at least one selected from the group consisting of a polysilazane compound, optionally, for example, a carbon-containing silicon polymer compound, other components (e.g., a curing agent, other polymers, an antioxidant, a light stabilizer, a flame retardant), and a solvent, onto a substrate film by a known method, and then appropriately drying the resulting coating film to form the layer. Because the polysilazane compounds mentioned above are included in the coating solution for the gas barrier precursor layer, heating after coating causes a conversion reaction of the polysilazane, resulting in a coating film with gas barrier properties (gas barrier precursor layer).

[0078] The thickness of the gas barrier precursor layer is preferably 30 to 1,500 nm. Even if the thickness of the gas barrier precursor layer is on the nanoscale, a light-diffusing gas barrier film with sufficient gas barrier performance can be obtained by subsequently applying a modification treatment.

[0079] Examples of the above-mentioned modification treatments include ion implantation and vacuum ultraviolet light irradiation (e.g., irradiation with an excimer laser). Among these, ion implantation is preferred because it provides high gas barrier performance. In ion implantation, the amount of ions implanted into the polymer layer can be appropriately determined according to the intended use of the light-diffusing gas barrier film to be formed (e.g., required gas barrier properties, light transmittance, or flexibility).

[0080] Examples of ions to be implanted include noble gas ions such as argon, helium, neon, krypton, and xenon; and ions such as fluorocarbons, hydrogen, nitrogen, oxygen, carbon dioxide, chlorine, fluorine, and sulfur. These ions may be used individually or in combination of two or more.

[0081] There are no particular limitations on the method of ion implantation, but examples include irradiating with ions accelerated by an electric field (ion beam) and implanting ions in a plasma. Among these, the latter method of implanting plasma ions is preferred because it allows for the simple acquisition of a gas barrier film.

[0082] Examples of ion species to be implanted with plasma ions include those similar to those exemplified above as ions to be implanted.

[0083] 1-5. Adhesive layer When a light-diffusing gas barrier film has an adhesive layer, as in the light-diffusing gas barrier films 100C and 100D described above, it is preferable to use a water vapor barrier adhesive layer. The adhesive layer is formed from an adhesive composition containing, for example, a modified polyolefin resin as component (A) and a polyfunctional epoxy compound as component (B). The above adhesive composition exhibits excellent adhesive strength due to the inclusion of a modified polyolefin resin. Furthermore, the cured product of the adhesive composition containing a polyfunctional epoxy compound exhibits excellent water vapor barrier properties.

[0084] The above adhesive composition may contain components other than components (A) and (B). Examples of components other than components (A) and (B) include components (C), (D), and (E) listed below. • (C) Ingredients: Tackifier with a softening point of 80°C or higher • (D) Component: Imidazole-based curing catalyst • (E) Component: Silane coupling agent

[0085] (A) The modified polyolefin resin as component is a polyolefin resin into which functional groups have been introduced.

[0086] Modified polyolefin resins can be obtained by modifying a polyolefin resin, which is used as a precursor, with a modifying agent. Modifiers used in the modification treatment of polyolefin resins are compounds that have functional groups, i.e., groups that can contribute to crosslinking reactions, within their molecules. Examples of functional groups include carboxyl groups, carboxylic acid anhydride groups, carboxylic acid ester groups, hydroxyl groups, epoxy groups, amide groups, ammonium groups, nitrile groups, amino groups, imide groups, isocyanate groups, acetyl groups, thiol groups, ether groups, thioether groups, sulfone groups, phosphoric acid groups, nitro groups, urethane groups, and halogen atoms. Among these, carboxyl groups, carboxylic acid anhydride groups, carboxylic acid ester groups, hydroxyl groups, ammonium groups, amino groups, imide groups, and isocyanate groups are preferred, carboxylic acid anhydride groups and alkoxysilyl groups are more preferred, and carboxylic acid anhydride groups are particularly preferred. A compound having a functional group may have two or more functional groups within its molecule.

[0087] Examples of modified polyolefin resins include acid-modified polyolefin resins and silane-modified polyolefin resins. Among these, acid-modified polyolefin resins are preferred from the viewpoint of obtaining better effects than those of the present invention.

[0088] Commercially available acid-modified polyolefin resins can also be used. Examples of commercially available products include Admer® (manufactured by Mitsui Chemicals, Inc.), Unistor® (manufactured by Mitsui Chemicals, Inc.), BondyRam (manufactured by Polyram Inc.), orevac® (manufactured by ARKEMA Inc.), and Modic® (manufactured by Mitsubishi Chemical Corporation).

[0089] Modified polyolefin resins can be used individually or in combination of two or more types.

[0090] The weight-average molecular weight (Mw) of the modified polyolefin resin is not particularly limited, but from the viewpoint of obtaining better effects of the present invention, 10,000 to 2,000,000 is preferred. The weight-average molecular weight (Mw) of modified polyolefin resins can be determined by performing gel permeation chromatography using tetrahydrofuran as the solvent, and expressed as a value equivalent to standard polystyrene.

[0091] The content of the modified polyolefin resin is not particularly limited, but from the viewpoint of obtaining better effects of the present invention, it is preferable that the total amount of the modified polyolefin resin and component (B) below be 30% by mass or more, based on the solid content of the adhesive composition.

[0092] (B) The polyfunctional epoxy compound as component is a compound having at least two epoxy groups in its molecule.

[0093] Examples of epoxy compounds having two or more epoxy groups include bisphenol A diglycidyl ether, bisphenol F diglycidyl ether, bisphenol S diglycidyl ether, brominated bisphenol A diglycidyl ether, brominated bisphenol F diglycidyl ether, brominated bisphenol S diglycidyl ether, novolac-type epoxy resins (e.g., phenol-novolac-type epoxy resins, cresol-novolac-type epoxy resins, brominated phenol-novolac-type epoxy resins), and hydrogenated bisphenol Examples include Nol A diglycidyl ether, hydrogenated bisphenol F diglycidyl ether, hydrogenated bisphenol S diglycidyl ether, pentaerythritol polyglycidyl ether, 1,6-hexanediol diglycidyl ether, hexahydrophthalate diglycidyl ester, neopentyl glycol diglycidyl ether, trimethylolpropane polyglycidyl ether, 2,2-bis(3-glycidyl-4-glycidyloxyphenyl)propane, and dimethylol tricyclodecane diglycidyl ether. These polyfunctional epoxy compounds can be used individually or in combination of two or more.

[0094] The amount of the polyfunctional epoxy compound, which is component (B) in the above adhesive composition, is preferably 25 to 200 parts by mass per 100 parts by mass of component (A). Cured products of adhesive compositions in which the amount of polyfunctional epoxy compound is within this range exhibit superior water vapor barrier properties.

[0095] Examples of component (C) include rosin resins such as polymerized rosin, polymerized rosin esters, and rosin derivatives; terpene resins such as polyterpene resins, aromatically modified terpene resins and their hydrides, and terpene phenol resins; coumarone-indene resins; petroleum resins such as aliphatic petroleum resins, aromatic petroleum resins and their hydrides, and aliphatic / aromatic copolymer petroleum resins; low molecular weight polymers of styrene or substituted styrene; styrene resins such as α-methylstyrene monopolymer resins, α-methylstyrene / styrene copolymer resins, styrene monomer / aliphatic monomer copolymer resins, styrene monomer / α-methylstyrene / aliphatic monomer copolymer resins, styrene monomer monopolymer resins, and styrene monomer / aromatic monomer copolymer resins. Among these, styrene resins are preferred, and styrene monomer / aliphatic monomer copolymer resins are more preferred. These tackifiers can be used individually or in combination of two or more.

[0096] The softening point of the tackifier is 80°C or higher. Having a softening point of 80°C or higher allows for the production of an adhesive composition with excellent adhesion at high temperatures. Furthermore, it improves the workability when forming the adhesive composition into a sheet.

[0097] If the above adhesive composition contains a tackifier having a softening point of 80°C or higher, which is component (C), the amount of tackifier is preferably 1 to 200 parts by mass per 100 parts by mass of component (A).

[0098] (D) The imidazole-based curing catalyst as component is a compound having an imidazole skeleton that catalyzes the curing reaction of the adhesive composition. Examples of imidazole-based curing catalysts include 2-methylimidazole, 2-phenylimidazole, 2-undecylimidazole, 2-heptadecylimidazole, 2-ethyl-4-methylimidazole, 2-phenyl-4-methylimidazole, 2-phenyl-4-methyl-5-hydroxymethylimidazole, and 2-phenyl-4,5-dihydroxymethylimidazole. Among these, 2-ethyl-4-methylimidazole is preferred. These imidazole-based curing catalysts can be used individually or in combination of two or more.

[0099] If the above adhesive composition contains an imidazole-based curing catalyst, its content is preferably 0.1 to 10 parts by mass per 100 parts by mass of component (A).

[0100] The above adhesive composition may contain a solvent. Examples of solvents include aromatic hydrocarbon solvents such as benzene and toluene; ester solvents such as ethyl acetate and butyl acetate; ketone solvents such as acetone, methyl ethyl ketone, and methyl isobutyl ketone; aliphatic hydrocarbon solvents such as n-pentane, n-hexane, and n-heptane; and alicyclic hydrocarbon solvents such as cyclopentane, cyclohexane, and methylcyclohexane. These solvents can be used individually or in combination of two or more. The solvent content can be determined as appropriate, taking into consideration coating properties and other factors.

[0101] The above adhesive composition may contain other components as long as they do not interfere with the effects of the present invention. Examples of other components include various additives (e.g., UV absorbers, antistatic agents, light stabilizers, antioxidants, resin stabilizers, fillers, pigments, bulking agents, and softeners). These can be used individually or in combination of two or more. If the above adhesive composition contains these additives, their content can be appropriately determined according to the purpose.

[0102] The thickness of the adhesive layer is preferably 5 to 1,000 μm, and more preferably 10 to 40 μm, from the viewpoint of adhesiveness and water vapor permeability resistance.

[0103] The above adhesive composition is prepared by appropriately mixing and stirring the specified components according to conventional methods.

[0104] Furthermore, the above adhesive layer can also be used as an adhesive layer for attaching to an object, similar to the adhesive layer 40 in the light-diffusing gas barrier films 100A' to 100E' described above.

[0105] 1-7. Other configuration examples of light-diffusing gas barrier films The light-diffusing gas barrier film according to the embodiment of the present invention is not limited to those shown in Figures 1 to 5, and may include, for example, one or more other layers on the base film, between the base film and the gas barrier layer, on the gas barrier layer, between the base film and the light-diffusing layer, and on the light-diffusing layer, as long as the objective of the present invention is not impaired. Other layers mentioned above include, for example, other gas barrier layers and protective layers. Furthermore, the placement of these other layers is not limited to those described above.

[0106] Furthermore, the light-diffusing gas barrier film may be in long lengths. In this case, the light-diffusing gas barrier film may be in the form of a roll wound around a core material.

[0107] 2. Devices with light-diffusing gas barrier film A device with a light-diffusing gas barrier film according to one or more embodiments of the present invention comprises any of the above-mentioned light-diffusing gas barrier films and a device body, wherein the adhesive surface of the light-diffusing gas barrier film is attached to the surface to which the device body is to be attached.

[0108] Figure 6 is a cross-sectional view showing an example of a device with a light-diffusing gas barrier film according to the present invention. The device 200 with a light-diffusing gas barrier film shown in Figure 6 has a structure in which the above-described light-diffusing gas barrier film 100A' and the device body 201 are laminated together, and the back surface of the adhesive layer 40 of the light-diffusing gas barrier film 100A' is attached to the device body 201.

[0109] Examples of the above-mentioned devices include liquid crystal displays, reflective liquid crystal displays, organic electroluminescent displays, electronic paper, and solar cells. [Examples]

[0110] Next, specific embodiments of the present invention will be described, but the present invention is not limited in any way by these examples. The water vapor transmittance, total light transmittance, haze value, and luminance characteristics of the light-diffusing gas barrier films and comparative laminates prepared in the examples described later were measured, calculated, and evaluated using the following procedure.

[0111] [Water Vapor Transmittance (WVTR)] Using a water vapor transmission rate measuring device (MOCON, AQUATRAN-2 (AQUATRAN is a registered trademark)), the water vapor transmission rate (WVTR) (unit: g / m³) of the light-diffusing gas barrier film of the example immediately after manufacturing and the laminate of the comparative example immediately after manufacturing were measured under conditions of 90% relative humidity and 40°C. 2 The value of " / day" was measured. The same measurements were also performed on each of the above light-diffusing gas barrier films and laminates after being stored for 1,000 hours under conditions of 90% relative humidity and 60°C.

[0112] [Total light transmittance (Tt)] The total light transmittance Tt was measured for the light-diffusing gas barrier film of the example immediately after manufacturing and the laminate of the comparative example immediately after manufacturing, using an SH7000 manufactured by Nippon Denshoku Industries Ltd., in accordance with JIS K 7361-1:1997. The same measurements were also performed on each of the above light-diffusing gas barrier films and laminates after being stored for 1,000 hours under conditions of 90% relative humidity and 60°C. Then, if Tt was over 85%, it was rated as "VG", if it was between 75% and 85%, it was rated as "G", and if it was less than 75%, it was rated as "NG".

[0113] [Hayes] The haze values ​​of the light-diffusing gas barrier film of the example immediately after manufacturing and the laminate of the comparative example immediately after manufacturing were measured using an SH7000 manufactured by Nippon Denshoku Industries Ltd., in accordance with JIS K 7136:2000. The same measurements were also performed on each of the above light-diffusing gas barrier films and laminates after being stored for 1,000 hours under conditions of 90% relative humidity and 60°C. Then, we evaluated the haze value as "VG" if it was over 30%, "G" if it was between 10% and 30%, and "NG" if it was less than 10%.

[0114] [Brightness characteristics] In the light-diffusing gas barrier film manufactured in the example and the laminate manufactured in the comparative example, one release liner of an adhesive sheet was peeled off to expose the adhesive layer, which was then applied to the adhesive surface. Next, the other release liner of the adhesive sheet was peeled off, and the exposed adhesive layer was applied to a 1.1 mm thick soda-lime glass to obtain a measurement sample. This sample was placed in a small scattering analyzer (Lightec Co., Ltd., product name "Mini-DiffV2") so that the measurement light (white light with a value of 100 (unitless)) was incident from the soda-lime glass side. Then, under conditions of 23°C and 50% RH, the luminance was measured at a measurement wavelength of 622 nm from an angle of 0° in front of the sample (directly in front of the sample). The luminance measurement was calibrated so that the luminance at 0° in front of the sample was 100 in a blank measurement without the sample. The brightness was then evaluated according to the following criteria. • "VG": When the luminance at an azimuth angle of 0° and an extreme angle of 10° is greater than 70%, and the luminance at an azimuth angle of 90° and an extreme angle of 10° is also greater than 70%. • "G": The luminance at an azimuth angle of 0° and a polar angle of 10°, and the luminance at an azimuth angle of 90° and a polar angle of 10° are both 50% or higher, and at least one of them is 70 or lower. • "NG": When the luminance at an azimuth angle of 0° and an extreme angle of 10°, and the luminance at an azimuth angle of 90° and an extreme angle of 10°, are both less than 50%.

[0115] [Changes in brightness after humid heat resistance test] Each sample underwent a humid heat endurance test by being stored for 1,000 hours under conditions of 90% relative humidity and 60°C. A sample was judged "OK" if the brightness value was 1.5 times or less of the initial value, and "NG" if the brightness value exceeded 1.5 times the initial value.

[0116] [Water resistance evaluation of simulated devices] A 150 nm thick film of metallic calcium was deposited onto the surface of a 0.2 mm thick quartz glass plate using a vacuum deposition apparatus (ALS Corporation, E-200). During this process, the deposition was masked to ensure that the film was deposited only in a 4 cm square area. Then, the surface of the adhesive layer was bonded to the quartz glass and the metallic calcium deposition area at room temperature (25°C) so that the 4cm square metallic calcium deposition area formed on the quartz glass was covered with a sample similar to the sample used for measuring the brightness characteristics described above, thus creating an evaluation device. This evaluation device was left undisturbed for 1,000 hours in an environment of 60°C and 90% relative humidity.

[0117] After standing, the area where the metallic calcium was deposited was photographed at 5x magnification using a digital camera (Keyence Corporation, product name "VHX-100") from the side where the evaluation device was attached, and a digital image was acquired. The obtained digital images were then analyzed using the ColorCount v1.3 software. Areas with a score of 100 or less were classified as corroded, and areas with a score of 101 or more were classified as uncorroded. The percentage of the area of ​​the corroded area was calculated by dividing the number of bits in the corroded area by the total number of bits, and the images were classified according to the following criteria. EX: More than 99.5% of the area is uncorroded. VG: The uncorrosed portion is 90% or more, but less than 99.5%. G: The uncorroded portion is greater than 0% but less than 90%. NG: 100% of the area is corroded.

[0118] [Fabrication of gas barrier film X] A polysilazane layer was formed by coating the untreated side (PET side) of a 50 μm thick polyethylene terephthalate (PET) film (A-4160, manufactured by Toyobo Co., Ltd.) with an easy-adhesion treatment on one side, with perhydropolysilazane (DHC-05AM, manufactured by DNF Corporation), and then heat-curing it at 100°C for 2 minutes. The thickness of the polysilazane layer was 200 nm. Next, plasma ion implantation was performed on the polysilazane layer using a plasma ion implanter under the following conditions to modify the surface of the polysilazane layer and obtain the first gas barrier layer. Then, the second gas barrier layer was formed using the same procedure to obtain gas barrier film X. The water vapor transmission rate of gas barrier film X is 5.0 × 10⁻⁶. -4 g / m 2 It was / day. The plasma ion implantation apparatus and plasma ion implantation conditions used in the above modification process are as follows. (Plasma ion implanter) • RF power supply: Model number "RF56000", manufactured by JEOL Ltd. • High-voltage pulse power supply: "PV-3-HSHV-0835", manufactured by Kurita Manufacturing Co., Ltd. (Plasma ion implantation conditions) • Plasma-generating gas: He • Gas flow rate: 100 sccm ·Duty ratio: 0.5% • Repetition frequency: 1,000Hz • Applied voltage: -10kV ·RF power supply: Frequency 13.56MHz, applied power 1,000W Chamber pressure: 0.2 Pa • Pulse width: 5 μsec • Processing time (ion implantation time): 200 seconds

[0119] [Fabrication of a light-diffusing film having a light-diffusing layer Ya] To 40 parts by mass (solid content equivalent; the same applies hereinafter) of polyether urethane methacrylate with a weight-average molecular weight of 9,900, obtained by reacting polypropylene glycol, isophorone diisocyanate, and 2-hydroxyethyl methacrylate as low refractive index components, 60 parts by mass of o-phenylphenoxyethoxyethyl acrylate with a molecular weight of 268, as a high refractive index component, and 8 parts by mass of 2-hydroxy-2-methyl-1-phenylpropan-1-one as a photopolymerization initiator were added, and the mixture was heated and mixed at 80°C to obtain a composition for a light diffusion control layer. The obtained light diffusion control layer composition was applied to one side of a long polyethylene terephthalate sheet, which served as the process sheet, to form a coating film. Subsequently, a polyethylene terephthalate film (manufactured by Toyobo Co., Ltd., product name "PET50 A4360", thickness: 50 μm), which served as a second base film, was laminated to the side of the coating film opposite to the process sheet.

[0120] The resulting laminate, consisting of the second base film, the coating film, and the process sheet, was placed on a conveyor. At this time, the side of the laminate facing the second base film was facing upwards, and the longitudinal direction of the laminate was parallel to the flow direction of the conveyor. A UV spot parallel light source (manufactured by Jatec Co., Ltd.), with a central beam parallelism controlled to within ±3°, was then installed on the conveyor on which the laminate was placed. At this time, the light source was installed so that it could irradiate parallel light in a direction tilted 15° to the opposite side of the conveyor's flow direction with respect to the normal direction of the side of the laminate facing the second base film. Furthermore, the distance between the surface of the second base film and the light source was set to 240 mm.

[0121] Subsequently, the conveyor is activated, moving the laminate at a speed of 0.2 m / min, while the peak illuminance on the coating surface is 2.00 mW / cm². 2 Total luminous intensity: 53.13 mJ / cm² 2 Under these conditions, the coating film in the laminate was cured by irradiating it with parallel light with a parallelism of 2° or less (ultraviolet light from a high-pressure mercury lamp with a main peak wavelength of 365 nm and other peaks at 254 nm, 303 nm, and 313 nm). As a result, a laminate was fabricated in which the aforementioned coating film had hardened and a 60 μm thick diffusion control layer was formed. Furthermore, by peeling the process sheet from the above laminate, a light diffusion control film was obtained as a light diffusion film having a light diffusion layer Ya, in which a second base film and the light diffusion control layer were laminated in that order.

[0122] Furthermore, microscopic observation of the cross-section of the obtained light-diffusing film revealed that a columnar structure, consisting of multiple columnar objects standing upright throughout the entire thickness direction, was formed within the light-diffusing control layer. In other words, the proportion of the columnar structure region extending in the thickness direction within the obtained light-diffusing control layer was 100%. In addition, it was confirmed that the aforementioned columnar objects were inclined at a 20° angle (inclination angle -20°) in the direction opposite to the direction of conveyor travel relative to the thickness direction of the light-diffusing control layer. Note that this inclination angle is denoted as 0° in the direction normal to the film surface, with the direction of conveyor travel being positive and the opposite direction being negative.

[0123] Furthermore, the peak illuminance and integrated light intensity mentioned above were measured by placing a UV meter (manufactured by iGraphics Co., Ltd., product name "i UV Integrated Illuminance Meter UVPF-A1") equipped with a light receiver at the location of the coating film. The thickness of the light-diffusing film was measured using a constant-pressure thickness measuring instrument (manufactured by Teclock Co., Ltd., product name "Teclock PG-02J").

[0124] [Fabrication of a light-diffusing film having a light-diffusing layer Yb] As an active energy ray-sensitive composition, 100 parts by mass of a hard coat agent [manufactured by JSR Corporation, trade name "Opstar Z7524", solid content concentration 70% by mass, 65% by mass of a total active energy ray-curable compound containing reactive silica fine particles and polyfunctional acrylate, 5% by mass of a photopolymerization initiator, 30% by mass of methyl ethyl ketone, refractive index of cured product 1.50] was uniformly mixed to prepare a coating agent for an anti-glare hard coat layer with a solid content of approximately 40% by mass. The above coating agent 1 was applied to the surface of an 80 μm thick TAC film [manufactured by Fujifilm Corporation, product name "TAC80TD80ULH"] using a Meyer bar to achieve a cured film thickness of approximately 10 μm. After drying in a 70°C oven for 1 minute, it was heated with a high-pressure mercury lamp at 300 mJ / cm². 2 A hard coat layer was formed by irradiating it with ultraviolet light, and an anti-glare hard coat film was fabricated as a light-diffusing film having a light-diffusing layer Yb.

[0125] [Preparation of adhesive layer Z] 100 parts by mass of a modified polyolefin resin (acid-modified α-olefin polymer, manufactured by Mitsui Chemicals, Inc., trade name: Unistol H-200, weight-average molecular weight: 52,000), 100 parts by mass of a polyfunctional epoxy compound (1) (hydrogenated bisphenol A diglycidyl ether, manufactured by Kyoeisha Chemical Co., Ltd., trade name: Epolite 4000, liquid at 25°C, epoxy equivalent 215-245 g / eq, weight-average molecular weight: 800), 50 parts by mass of a tackifier (styrene monomer aliphatic monomer copolymer, softening point 95°C, manufactured by Mitsui Chemicals, Inc., trade name: FTR6100), and 1 part by mass of an imidazole-based curing catalyst (2-ethyl-4-methylimidazole) were dissolved in methyl ethyl ketone to prepare adhesive composition 1 with a solid content concentration of 30% by mass. This adhesive composition 1 was applied to the release surface of a release film (Lintec Corporation, product name: SP-PET382150), and the resulting coating was dried at 100°C for 2 minutes to form an adhesive layer with a thickness of 12 μm. The release surface of another release film (Lintec Corporation, product name: SP-PET381031) was then bonded onto it. In this way, an adhesive layer Z was obtained between the pair of release films.

[0126] <Example 1> In the "Preparation of Gas Barrier Film X" described above, a light-diffusing gas barrier film having the same layer configuration (configuration A) as the light-diffusing gas barrier film 100B described above was prepared by performing the same procedure as described above, except that a light-diffusing film having a light-diffusing layer Ya was used instead of a 50 μm thick polyethylene terephthalate film (manufactured by Toyobo Co., Ltd., A-4160) that had been easily bonded to one side.

[0127] <Example 2> In accordance with the manufacturing procedure described above for "light diffusing layer Ya," a light diffusing layer Ya was formed on the side of the gas barrier film X opposite to the gas barrier layer (the exposed side of the base film) instead of the second base film, thereby producing a light diffusing gas barrier film having the same layer configuration (configuration B) as the light diffusing gas barrier film 100C described above.

[0128] <Example 3> A light-diffusing gas barrier film having a light-diffusing layer Ya was fabricated by bonding the side of the light-diffusing film opposite to the light-diffusing layer Ya (the exposed side of the second base film) and the side of the gas barrier film X opposite to the base film (the exposed side of the gas barrier layer) with an adhesive layer Z, thereby creating a light-diffusing gas barrier film having the same layer configuration (configuration C) as the light-diffusing gas barrier film 100D described above.

[0129] <Example 4> A light-diffusing gas barrier film having a light-diffusing layer Ya was fabricated by bonding the side of the light-diffusing film opposite to the light-diffusing layer Ya (the exposed side of the second base film) with the side of the gas barrier film X opposite to the gas barrier layer (the exposed side of the first base film) using an adhesive layer Z. This resulted in a light-diffusing gas barrier film having the same layer configuration (configuration D) as the light-diffusing gas barrier film 100E described above.

[0130] <Example 5> A light-diffusing layer Yb was formed on the gas barrier layer of gas barrier film A in accordance with the manufacturing procedure described in "light-diffusing layer b" above, thereby producing a light-diffusing gas barrier film having the same layer configuration (configuration A) as the light-diffusing gas barrier film 100B described above.

[0131] <Comparative Example 1> The above-mentioned light-diffusing film having the above-mentioned light-diffusing layer Ya was used as is to form the laminate of Comparative Example 1. In Table 1, the configuration of this laminate is described as "Configuration E".

[0132] <Comparative Example 2> The gas barrier film X described above was used as is to create the laminate of Comparative Example 2. In Table 1, the configuration of this laminate is referred to as "Configuration F".

[0133] <Comparative Example 3> A hard coat layer coating agent was prepared on the side of the gas barrier film X opposite to the base film (the exposed side of the gas barrier layer), except that spherical organic fine particles in the light diffusion layer Yb were removed. This coating agent was then applied and dried in the same manner to form a light-transmitting layer with a thickness of 10 μm, thereby creating the laminate of Comparative Example 3. In Table 1, the layer configuration of this laminate is referred to as "Configuration G".

[0134] The measurement and evaluation results for the light-diffusing gas barrier films of each example and the laminates of the comparative examples are shown in Table 1, along with the composition of each light-diffusing gas barrier film and laminate, and the thickness of the gas barrier layer.

[0135] [Table 1]

[0136] As is clear from the results in Table 1, the light-diffusing gas barrier films of Examples 1 to 5 exhibited high gas barrier properties and light transmittance, as well as good haze values ​​and brightness. Furthermore, high gas barrier properties were maintained even after the humid heat durability test, light transmittance and haze remained good, and changes in brightness characteristics were kept to a minimum. In addition, the water resistance evaluation of the simulated device was also good, indicating that even when used on objects sensitive to water vapor, such as image elements and solar cell elements, water vapor degradation of such elements can be prevented while maintaining light diffusion. In particular, the light-diffusing gas barrier films of Examples 1 to 4 exhibited extremely good light transmittance, haze, and brightness characteristics, and these characteristics were maintained at a high level even after the humid heat durability test. Moreover, the light-diffusing gas barrier films of Examples 1, 3, and 5, which have configurations A and C, in which the gas barrier layer is formed directly on the base film and the side of the base film opposite the gas barrier layer is the adhesive surface, exhibited particularly good water resistance evaluation of the simulated device.

[0137] On the other hand, the laminate of Comparative Example 1, which lacked a gas barrier layer, exhibited significantly lower gas barrier properties from the outset compared to the Examples, and when attached to the device body, it was at a level that would cause degradation of the device body. Furthermore, the gas barrier properties after the moist heat durability test also decreased compared to the initial state. In addition, the water resistance evaluation of the pseudo-device was significantly inferior to that of the light-diffusing gas barrier film of the Examples. The laminate of Comparative Example 2, which lacked a light-diffusing layer, and the laminate of Comparative Example 3, which had a light-transmitting layer instead of a light-diffusing layer on the outer surface, both exhibited low haze values ​​from the outset and failed to achieve sufficient light diffusion. Furthermore, while both initially exhibited good gas barrier properties, the degree of deterioration in gas barrier properties after the moist heat endurance test was greater than that of the light-diffusing gas barrier film in the example. [Explanation of Symbols]

[0138] 10: Gas barrier layer 20: Light Diffusion Layer 30, 31, 32: Base film 40, 41: Adhesive layer 100: Light-diffusing gas barrier film 200: Device with light-diffusing gas barrier film 201: Device body

Claims

1. A light-diffusing gas barrier film having an adhesive surface that is applied to the object to be attached, and an outer surface opposite to the adhesive surface, and satisfying the following conditions (i) to (iii). (i) The haze value is 10% or higher. (ii) The total light transmittance is 75% or more. (iii) The water vapor transmission rate under conditions of 90% relative humidity and 40°C is 1.0 × 10⁻⁶. －３ g / m ２ It is less than / day.

2. It has a gas barrier layer and a light diffusing layer, The gas barrier film according to claim 1, wherein the light diffusing layer is located on the outer side with respect to the gas barrier layer.

3. The light-diffusing gas barrier film according to claim 2, wherein the light-diffusing layer is a light-diffusing control layer having a plurality of high-refractive-index regions extending in the thickness direction and low-refractive-index regions covering the periphery of the high-refractive-index regions and having a lower refractive index than the high-refractive-index regions.

4. The light-diffusing gas barrier film according to claim 2, wherein the gas barrier layer has a modified region.

5. A device with a light-diffusing gas barrier film, comprising a light-diffusing gas barrier film according to any one of claims 1 to 4, and a device body, wherein the adhesive surface of the light-diffusing gas barrier film is attached to the surface to which the device body is to be attached.

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