JP7375271B2 - Primer layer forming composition, barrier film, wavelength conversion sheet, and method for producing wavelength conversion sheet - Google Patents

Description

The present invention relates to a composition for forming a primer layer, a barrier film, a wavelength conversion sheet, and a method for producing a wavelength conversion sheet.

Wavelength conversion sheets using phosphors such as quantum dots have high brightness and color reproducibility, and are desired to be used in displays. However, phosphors such as quantum dots deteriorate upon contact with oxygen or water vapor. Therefore, wavelength conversion sheets often employ a structure in which a barrier film in which a gas barrier layer is formed on a polymer film is disposed on one or both sides of a phosphor layer containing a phosphor.

For example, in Patent Document 1, a barrier film is attached to both sides of a phosphor layer in which quantum dots are dispersed in an acrylic resin and an epoxy resin, thereby preventing oxygen and the like from entering the phosphor layer.

International Publication No. 2014/113562

However, the phosphor layer in which quantum dots, which are inorganic materials, are dispersed, as described in Patent Document 1, has poor adhesion with the barrier film, and there is a risk of peeling between the phosphor layer and the barrier film. there were. Furthermore, in addition to the quantum dot film described in Patent Document 1, in an optical laminate having a structure in which a phosphor layer and a barrier film are laminated, peeling of the barrier film has a great effect on performance deterioration. There is a need to improve the adhesion between the barrier film and the phosphor layer. Furthermore, if the optical laminate is left in a high-temperature, high-humidity environment for a long period of time, peeling between the phosphor layer and the barrier film is more likely to occur, and this peeling can cause moisture and oxygen to escape from the edge of the sheet. There is a problem in that the light emitting properties of the phosphor layer are likely to deteriorate due to the intrusion. Therefore, the optical laminate is required to be able to maintain excellent adhesion between the phosphor layer and the barrier film even when placed in a high temperature, high humidity environment for a long time.

Furthermore, when manufacturing an optical laminate, the phosphor layer may be cured by ultraviolet irradiation. Therefore, the present inventor provided a primer layer on each of the surfaces in contact with the phosphor layer of a pair of barrier films sandwiching the phosphor layer, and caused the components in the primer layer to react with the components in the phosphor layer during the ultraviolet irradiation. We investigated ways to improve the adhesion between the barrier film and the phosphor layer. However, since ultraviolet irradiation is performed only from one barrier film side, the reaction between the components in the primer layer and the components in the phosphor layer does not proceed sufficiently in the barrier film on the opposite side of the phosphor layer. The inventors of the present invention have found that the effect of improving adhesion may not be sufficiently obtained in some cases. This is thought to be because the ultraviolet rays are absorbed by the phosphor layer and do not reach the barrier film on the opposite side of the phosphor layer. It is possible to improve the adhesion of the barrier films on both sides by performing double-sided exposure on the optical laminate, but there are major limitations such as the need for equipment modification, so it is required that single-sided exposure can be used. There is.

The present invention has been made in view of the problems of the prior art described above, and provides excellent adhesion to the phosphor layer, as well as excellent adhesion even when left in a high temperature and high humidity environment for a long time. Furthermore, when curing the phosphor layer by single-sided exposure, it is possible to form a primer layer that can obtain excellent adhesion even when placed on the side opposite to the exposed side of the phosphor layer. The present invention aims to provide a composition for forming a primer layer, a barrier film including a primer layer formed using the composition, a wavelength conversion sheet including the barrier film, and a method for producing a wavelength conversion sheet.

In order to achieve the above object, the present invention provides a primer layer forming composition for forming a primer layer adjacent to a phosphor layer of an optical laminate, the composition comprising a resin having a reactive carbon-carbon double bond. , a resin that does not have a reactive carbon-carbon double bond and has a primary hydroxyl group, and a polyisocyanate compound that has a maximum absorption coefficient of 100 ml/(g cm) or more in the visible light region with a wavelength of 400 to 700 nm. Provided is a primer layer forming composition containing a photopolymerization initiator.

According to the composition for forming a primer layer, the two types of resins having the specific structure, the polyisocyanate compound, and the maximum absorption coefficient in the visible light region of wavelengths 400 to 700 nm are 100 ml/(g cm) or more. By containing a certain photopolymerization initiator, excellent adhesion to the phosphor layer can be obtained, and even when placed in a high temperature and high humidity environment for a long time, excellent adhesion can be maintained. When a phosphor layer is cured by single-sided exposure, a primer layer can be formed that can provide excellent adhesion even when placed on the opposite side of the phosphor layer to the exposed side. It is believed that the above effects are achieved for the following reasons. That is, by containing the two types of resins having the above-mentioned specific structures and the polyisocyanate compound, a dense crosslinked structure is formed in the primer layer, resulting in excellent adhesion between the primer layer and the phosphor layer. In addition, the crosslinked structure is maintained even when placed in a high temperature and high humidity environment for a long time, and excellent adhesion is maintained. In addition, since the above-mentioned specific photoinitiator has sufficient sensitivity to visible light, when curing the phosphor layer by single-sided exposure, it is necessary to place it on the side opposite to the exposed side of the phosphor layer. Also, it is possible to form a primer layer that can obtain excellent adhesion to the phosphor layer. This is because the phosphor layer absorbs ultraviolet rays but easily transmits visible light, so visible light reaches the primer layer placed on the opposite side to the exposed side, and the photopolymerization initiator, which is sensitive to visible light, As a result, the reaction between components such as resins with reactive carbon-carbon double bonds in the primer layer and components such as ultraviolet (UV) curable resins in the phosphor layer progresses, and the adhesion between these layers increases. The purpose is to improve.

Due to the above-mentioned effects, by forming a primer layer using the above composition for forming a primer layer, peeling between the phosphor layer and the barrier film will occur even if the primer layer is left in a high-temperature, high-humidity environment for a long time. It is possible to prevent moisture and oxygen from entering from the edge of the sheet and deteriorating the luminescent properties of the phosphor layer. Furthermore, by forming a dense crosslinked structure in the primer layer, it is possible to suppress moisture and oxygen from entering from the edge of the sheet through the primer layer itself, thereby preventing deterioration of the luminescent properties of the phosphor layer. I can do it. In addition, since the composition for forming a primer layer contains a resin that does not have a reactive carbon-carbon double bond and has a primary hydroxyl group, a hydroxyl group is included in the primer layer, and the presence of this hydroxyl group causes particularly When the phosphor layer is formed using a resin containing epoxy resin or polyisocyanate, the adhesion between the primer layer and the phosphor layer is further improved.

In the composition for forming a primer layer, the content of the photopolymerization initiator is preferably 0.1 to 5% by mass based on the total solid content of the composition for forming a primer layer. By having the content of the photopolymerization initiator within the above range, the formed primer layer has better adhesion to the phosphor layer, and even when left in a high temperature and high humidity environment for a long time. To be able to maintain better adhesion, and to obtain even better adhesion even when the phosphor layer is placed on the side opposite to the exposed side when the phosphor layer is cured by single-sided exposure. I can do it.

The NCO/OH ratio of the primer layer forming composition is preferably 0.1 to 0.6. By having an NCO/OH ratio of 0.1 or more, a sufficient crosslinked structure is formed in the resulting primer layer, and the adhesion between the phosphor layer and the primer layer when left in a high temperature and high humidity environment for a long time is ensured. Decrease in sexual performance is more fully suppressed. On the other hand, when the NCO/OH ratio is 0.6 or less, sufficient hydroxyl groups remain in the primer layer, especially when the phosphor layer is formed using a resin containing epoxy resin or polyisocyanate. Adhesion between the primer layer and the phosphor layer is further improved.

The (meth)acrylic equivalent of the entire resin component contained in the primer layer forming composition is preferably 270 to 800 g/eq. The reactive carbon-carbon double bond shows strong adhesion to the UV-cured phosphor layer by being incorporated into the curing system of the phosphor layer during UV curing, but on the other hand, the reactive carbon-carbon double bond If there are many components, the wettability of the primer layer tends to decrease. Therefore, it is thought that there is an optimal range for the amount of reactive carbon-carbon double bonds present. Further, this reactive carbon-carbon double bond is preferably a carbon-carbon double bond derived from a (meth)acryloyl group. When the (meth)acrylic equivalent of the entire resin component excluding the polyisocyanate compound is within the above range, particularly good adhesion between the primer layer and the phosphor layer can be obtained. When the (meth)acrylic equivalent is 800 g/eq or less, there are sufficient reactive carbon-carbon double bonds, and particularly excellent adhesion between the phosphor layer and primer layer using UV curable resin is achieved. is obtained. On the other hand, when the (meth)acrylic equivalent is 270 g/eq or more, the wettability of the primer layer is improved and excellent adhesion with the phosphor layer is obtained.

The hydroxyl value of the entire resin component contained in the primer layer forming composition is preferably 150 to 230 mgKOH/g. When the hydroxyl value is within the above range, particularly good adhesion between the primer layer and the phosphor layer can be obtained. When the above-mentioned hydroxyl value is 150 mgKOH/g or more, crosslinking by the polyisocyanate compound is sufficiently performed during formation of the primer layer, the crosslinked structure is maintained even when placed in a high temperature and high humidity environment for a long time, and the fluorescence The excellent adhesion between the body layer and the primer layer is more fully maintained. On the other hand, when the above-mentioned hydroxyl value is 230 mgKOH/g or less, it is possible to prevent excessive hydroxyl groups from remaining in the primer layer and easy permeation of water vapor, and when the primer layer is left in a high temperature and high humidity environment for a long time. It is possible to prevent deterioration of the light emitting characteristics of the phosphor layer.

The present invention also provides a barrier film comprising a gas barrier film and a primer layer made of a cured product formed using the composition for forming a primer layer of the present invention, disposed on one outermost surface. . According to the barrier film, by including the primer layer, it is possible to obtain excellent adhesion to the phosphor layer through the primer layer, and also to have excellent adhesion even when placed in a high temperature and high humidity environment for a long time. Further, when the phosphor layer is cured by single-sided exposure, excellent adhesion can be obtained even when the phosphor layer is placed on the side opposite to the exposed side.

The present invention also provides a phosphor layer including a phosphor and a cured product of a curable resin, a first barrier film laminated on one surface of the phosphor layer, and a first barrier film laminated on the other surface of the phosphor layer. and a second barrier film laminated on the substrate, wherein the first barrier film is the barrier film of the present invention, wherein the first barrier film has the primer layer on the outermost surface on the phosphor layer side. do. According to the wavelength conversion sheet, since the first barrier film and the phosphor layer are laminated with the primer layer interposed therebetween, excellent adhesion between the first barrier film and the phosphor layer can be obtained, and It can maintain excellent adhesion even when placed in a high temperature and high humidity environment for a long time, and furthermore, even when exposed from the second barrier film side when curing the phosphor layer by single-sided exposure, Excellent adhesion between the first barrier film and the phosphor layer can be obtained.

The present invention further provides a step of forming a laminate including a first barrier film, a coating film of a composition for forming a phosphor layer containing a phosphor and a curable resin, and a second barrier film; curing the curable resin in the coating film to form a phosphor layer by irradiating light containing ultraviolet rays and visible light with a wavelength of 400 to 700 nm from the second barrier film side of the laminate; Provided is a method for producing a wavelength conversion sheet, which is the barrier film of the present invention, wherein the first barrier film has the primer layer on the outermost surface on the coating film side. The wavelength conversion sheet obtained by the above method has excellent adhesion between the first barrier film and the phosphor layer because the first barrier film and the phosphor layer are laminated via the primer layer. Moreover, excellent adhesion can be maintained even when placed in a high temperature and high humidity environment for a long time.

In the above manufacturing method, it is preferable that the minimum visible light transmittance of the coating film at a wavelength of 400 to 700 nm is 30% or more. Thereby, it is possible to obtain excellent adhesion between the first barrier film and the phosphor layer, and to maintain the excellent adhesion even when the film is placed in a high temperature and high humidity environment for a long time.

According to the present invention, it is possible to obtain excellent adhesion to the phosphor layer, maintain excellent adhesion even when placed in a high temperature and high humidity environment for a long time, and furthermore, by single-sided exposure, the phosphor layer A composition for forming a primer layer that can form a primer layer that can obtain excellent adhesion even when placed on the side opposite to the exposed side of the phosphor layer when curing the layer, and formed using the same. It is possible to provide a barrier film including a primer layer, a wavelength conversion sheet including the barrier film, and a method for producing a wavelength conversion sheet.

FIG. 1 is a schematic cross-sectional view showing one embodiment of the barrier film of the present invention. FIG. 1 is a schematic cross-sectional view showing one embodiment of the barrier film of the present invention. FIG. 1 is a schematic cross-sectional view showing one embodiment of the barrier film of the present invention. FIG. 1 is a schematic cross-sectional view showing one embodiment of the barrier film of the present invention. 1 is a schematic cross-sectional view showing one embodiment of a wavelength conversion sheet of the present invention. It is a graph showing the spectrum of light used for exposing the laminate in Examples and Comparative Examples. It is a graph showing the light transmittance of coating films in Examples and Comparative Examples.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described in detail below, with reference to the drawings as the case may be. In the drawings, the same or corresponding parts are denoted by the same reference numerals, and redundant explanations will be omitted. Furthermore, the dimensional ratios in the drawings are not limited to the ratios shown.

[Composition for forming primer layer]
The composition for forming a primer layer of the present invention is a composition for forming a primer layer for forming a primer layer adjacent to a phosphor layer of an optical laminate, and comprises a resin having a reactive carbon-carbon double bond. , a resin that does not have a reactive carbon-carbon double bond and has a primary hydroxyl group, a polyisocyanate compound, and a light having a maximum absorption coefficient of 100 ml/(g cm) or more in the visible light region with a wavelength of 400 to 700 nm. It contains a polymerization initiator. Each component will be explained in detail below.

(Resin with reactive carbon-carbon double bond)
A reactive carbon-carbon double bond refers to a carbon-carbon double bond that is capable of radical polymerization or cationic polymerization. The resin having a reactive carbon-carbon double bond can be a resin containing a group having a reactive carbon-carbon double bond. The group having a reactive carbon-carbon double bond is preferably a group having an ethylenically unsaturated double bond, for example, it is more preferably a styryl group or a (meth)acryloyl group. An acryloyl group is more preferable, and an acryloyl group is particularly preferable. When the group having a reactive carbon-carbon double bond is an acryloyl group, the reactivity within the primer layer and the reactivity with the phosphor layer tends to improve, and better adhesion can be obtained.

Examples of the resin having a reactive carbon-carbon double bond include polymers having a reactive carbon-carbon double bond in the molecule. Examples of the above-mentioned polymer include, for example, a polymer obtained by polymerizing one or more polymerizable monomers and introducing a reactive carbon-carbon double bond into the side chain. It is not limited to this. Resins having reactive carbon-carbon double bonds can be used alone or in combination of two or more.

The weight average molecular weight of the resin having a reactive carbon-carbon double bond is preferably 300 to 100,000, more preferably 500 to 50,000, and more preferably 1,000 to 30,000. is particularly preferred. When the weight average molecular weight is 300 or more, film formability tends to be good, and when it is 100,000 or less, coating suitability tends to be good. In this specification, the weight average molecular weight is determined by measuring by gel permeation chromatography (GPC) and converting it using a calibration curve using standard polystyrene.

The (meth)acrylic group equivalent of the resin having a reactive carbon-carbon double bond is preferably 214 to 360 g/eq, more preferably 214 to 290 g/eq. Since the (meth)acrylic group equivalent of the resin having a reactive carbon-carbon double bond is within the above range, the (meth)acrylic group equivalent of the entire resin component can be easily adjusted within the preferred range described below, and the phosphor It is easy to obtain excellent adhesion between the layer and the primer layer.

The resin having a reactive carbon-carbon double bond may have a hydroxyl group. The hydroxyl group may be a primary hydroxyl group or a secondary hydroxyl group. When the resin having a reactive carbon-carbon double bond has a hydroxyl group, the hydroxyl value thereof is preferably from 100 to 300 mgKOH/g, more preferably from 130 to 270 mgKOH/g. Since the hydroxyl value of the resin having a reactive carbon-carbon double bond is within the above range, it is easy to adjust the hydroxyl value of the entire resin component within the preferred range described below, and it can be kept in a high temperature and high humidity environment for a long time. Even in such a case, excellent adhesion between the phosphor layer and the primer layer can be easily maintained, and deterioration of the luminescent properties of the phosphor layer can be easily prevented.

(Resin that does not have a reactive carbon-carbon double bond and has a primary hydroxyl group)
Examples of the resin having a primary hydroxyl group without a reactive carbon-carbon double bond include polymers having a primary hydroxyl group without a reactive carbon-carbon double bond in the molecule. Examples of the above polymers include polymers using monomers containing a (meth)acryloyl group and a primary hydroxyl group, such as hydroxyalkyl (meth)acrylate and pentaerythritol triacrylate, as monomer components. However, it is not limited to this. The resins having primary hydroxyl groups without reactive carbon-carbon double bonds can be used alone or in combination of two or more.

The weight average molecular weight of the resin having a primary hydroxyl group without having a reactive carbon-carbon double bond is preferably 300 to 100,000, more preferably 500 to 50,000, and 1,000 to 1,000. It is particularly preferred that it is 30,000. When the weight average molecular weight is 300 or more, film formability tends to be good, and when it is 100,000 or less, coating suitability tends to be good.

The hydroxyl value of the resin having a primary hydroxyl group without a reactive carbon-carbon double bond is preferably 10 to 150 mgKOH/g, more preferably 30 to 100 mgKOH/g. Since the hydroxyl value of the resin that does not have reactive carbon-carbon double bonds and has primary hydroxyl groups is within the above range, it is easy to adjust the hydroxyl value of the entire resin component within the preferred range described below, and it can be used at high temperatures and high humidity. Even when left in the environment for a long time, excellent adhesion between the phosphor layer and the primer layer is easily maintained, and deterioration of the luminescent properties of the phosphor layer is easily prevented.

In the composition for forming a primer layer, the mass ratio of the content of a resin having a reactive carbon-carbon double bond to a resin having a primary hydroxyl group without having a reactive carbon-carbon double bond (reactive carbon - content of resin having a carbon double bond/reactive carbon-content of a resin having a primary hydroxyl group without a carbon double bond) is preferably 0.05 to 8.0, and 0. It is more preferably from .1 to 7.0, and even more preferably from 0.3 to 6.0. When this mass ratio is 0.05 or more, the adhesion between the phosphor layer and the primer layer, which uses UV curable resin, tends to be particularly good, and when it is 8.0 or less, the film formability is good. There is a tendency to

In the composition for forming a primer layer, the (meth)acrylic equivalent of the entire resin component is preferably 200 to 1000 g/eq, more preferably 250 to 900 g/eq, and more preferably 270 to 800 g/eq. More preferably, it is particularly preferably 280 to 500 g/eq. By setting the above (meth)acrylic equivalent to 1000 g/eq or less, there are sufficient reactive carbon-carbon double bonds in the resin component, and in particular, the combination of a phosphor layer and a primer layer using a UV curable resin is ensured. Excellent adhesion can be obtained. On the other hand, when the (meth)acrylic equivalent is 270 g/eq or more, the wettability of the primer layer is improved and excellent adhesion with the phosphor layer is obtained. In this specification, the resin component refers to the entire resin contained in the composition for forming a primer layer, and includes at least a resin having a reactive carbon-carbon double bond and a resin having a reactive carbon-carbon double bond. First, it is a component containing a resin having a primary hydroxyl group. Components other than the resin, such as a polyisocyanate compound, a photopolymerization initiator, and additives described below, are not included in the resin component. In addition, in this specification, the (meth)acrylic equivalent of the entire resin component refers to, for example, the (meth)acrylic equivalent of the resin having a reactive carbon-carbon double bond, and the reactive carbon proportion to the content of the entire resin component. - It can be determined by calculation from the proportion of resin having carbon double bonds. Alternatively, the (meth)acrylic equivalent of the entire resin component can also be determined by infrared spectroscopy or Raman spectroscopy by comparison with a calibration curve of a substance whose concentration is known.

In the composition for forming a primer layer, the hydroxyl value of the entire resin component is preferably 100 to 300 mgKOH/g, more preferably 120 to 250 mgKOH/g, even more preferably 150 to 230 mgKOH/g. , 170 to 220 mgKOH/g is particularly preferred. When the above-mentioned hydroxyl value is 100 mgKOH/g or more, crosslinking by the polyisocyanate compound is sufficiently performed during formation of the primer layer, the crosslinked structure is maintained even when placed in a high temperature and high humidity environment for a long time, and the fluorescence The excellent adhesion between the body layer and the primer layer is more fully maintained. On the other hand, when the above-mentioned hydroxyl value is 300 mgKOH/g or less, it is possible to prevent excessive hydroxyl groups from remaining in the primer layer and easy permeation of water vapor, and when the primer layer is left in a high temperature and high humidity environment for a long time. It is possible to prevent deterioration of the light emitting characteristics of the phosphor layer. In this specification, the hydroxyl value of the entire resin component is, for example, the hydroxyl value of a resin having a reactive carbon-carbon double bond, and the hydroxyl value of a resin having a primary hydroxyl group without a reactive carbon-carbon double bond. It can be determined by calculation from the hydroxyl value of the resin and the proportion of the resin in the total resin component content. Alternatively, the hydroxyl value of the entire resin component can also be determined by infrared spectroscopy or Raman spectroscopy by comparison with a calibration curve of a substance whose concentration is known.

(Polyisocyanate compound)
Examples of the polyisocyanate compound include tolylene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, xylylene diisocyanate, and those using these as raw materials. The polyisocyanate compound may be a prepolymer obtained by reacting the above-mentioned polyisocyanate compounds with each other, or a prepolymer obtained by reacting the above-mentioned polyisocyanate compound with alcohol. The polyisocyanate compound may be an isocyanurate type, a biuret type, an adduct type, a bifunctional type (a mixture of two types of polyisocyanate compounds), or the like. Among these, isocyanurate type and biuret type polyisocyanate compounds are preferred from the viewpoint of adhesiveness. One type of polyisocyanate compound can be used alone or two or more types can be used in combination.

The content of the polyisocyanate compound in the composition for forming a primer layer is preferably such that the NCO/OH ratio (molar ratio) in the composition for forming a primer layer is 0.05 to 1.0. The amount is more preferably 1 to 0.6, even more preferably 0.15 to 0.55, and particularly preferably 0.2 to 0.5. By having an NCO/OH ratio of 0.05 or more, a sufficient crosslinked structure is formed in the resulting primer layer, and the adhesion between the phosphor layer and the barrier film is improved when the primer layer is left in a high-temperature, high-humidity environment for a long time. Decrease in sexual performance is more fully suppressed. On the other hand, when the NCO/OH ratio is 1.0 or less, sufficient hydroxyl groups remain in the primer layer, especially when the phosphor layer is formed using a resin containing epoxy resin or polyisocyanate. Adhesion between the primer layer and the phosphor layer is further improved. In this specification, the NCO/OH ratio of the composition for forming a primer layer can be determined by infrared spectroscopy or Raman spectroscopy by comparison with a calibration curve of a substance whose concentration is known.

(Photopolymerization initiator)
The photopolymerization initiator has a maximum absorption coefficient of 100 ml/(g·cm) or more in the visible light region with a wavelength of 400 to 700 nm. The maximum absorption coefficient may be 150 ml/(g·cm) or more. When the maximum absorption coefficient is 100 ml/(g cm) or more, the photopolymerization initiator has sufficient sensitivity to visible light, and the resulting primer layer has a phosphor layer cured by single-sided exposure. Even when placed on the opposite side of the phosphor layer to the exposed side, visible light passes through the phosphor layer and reaches the primer layer, resulting in excellent adhesion to the phosphor layer. be able to.

The absorption coefficient of a photopolymerization initiator can be measured by a common method. For example, the absorption coefficient can be measured and calculated in accordance with JIS K0115:1992.

The photopolymerization initiator may have an absorption coefficient of 100 ml/(g·cm) or more, or 150 ml/(g·cm) or more at a wavelength of 405 nm. When the above-mentioned absorption coefficient is 100 ml/(g cm) or more, the obtained primer layer can be placed on the side opposite to the exposed side of the phosphor layer when the phosphor layer is cured by single-sided exposure. Also, since visible light with a wavelength of around 405 nm passes through the phosphor layer and reaches the primer layer, excellent adhesion to the phosphor layer can be obtained.

Examples of the photopolymerization initiator include acylphosphine oxides, acetophenones, benzophenones, thioxanthones, ketals, and anthraquinones. Among these, those having a maximum absorption coefficient in the visible light region of 100 ml/(g·cm) or more can be selected and used. The photoinitiator may also be sensitive to ultraviolet light. Among these, it is preferable to use acylphosphine oxides from the viewpoint of obtaining the effects of the present invention more fully.

The content of the photopolymerization initiator in the composition for forming a primer layer is preferably 0.1 to 5% by mass, based on the total solid content (nonvolatile content) of the composition for forming a primer layer, and preferably 0.5 to 5% by mass. It is more preferably 4% by mass, and even more preferably 1 to 3% by mass. When the content is at least the above lower limit, the photopolymerization initiator can sufficiently promote the photopolymerization reaction, and the formed primer layer has better adhesion to the phosphor layer and can withstand high temperatures. It can maintain superior adhesion even when left in a high humidity environment for a long time, and when curing the phosphor layer by single-sided exposure, the side opposite to the exposed side of the phosphor layer Better adhesion can be obtained even if the On the other hand, when the content is below the above upper limit, it is possible to suppress a relative decrease in the amount of the resin component, and it is possible to prevent the primer layer from becoming brittle and the adhesion from decreasing.

(Other ingredients)
The composition for forming a primer layer includes a resin having a reactive carbon-carbon double bond as described above, a resin having a primary hydroxyl group without having a reactive carbon-carbon double bond, a polyisocyanate compound, and a photopolymerization initiator. It may contain other components (additives) other than the agent. Examples of additives include slip agents, surfactants, solvents, antifoaming agents, antistatic agents, and the like. As the solvent, for example, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, ethyl acetate, butyl acetate, methanol, ethanol, isopropyl alcohol, and butanol can be used. In addition, the composition for forming a primer layer contains a photopolymerization initiator that has a maximum absorption coefficient of less than 100 ml/(g cm) in the visible light region with a wavelength of 400 to 700 nm and is sensitive to ultraviolet rays. It's okay.

In order to promote thermosetting of the primer layer, a thermosetting catalyst that promotes urethanization may be added to the primer layer forming composition. As the thermosetting catalyst, a tin-based catalyst, a zirconium-based catalyst, a titanium-based catalyst, or the like can be used.

[Barrier film]
The barrier film of the present invention includes a gas barrier film and a primer layer made of a cured product formed using the above primer layer forming composition and disposed on one outermost surface of the barrier film. Hereinafter, preferred embodiments of the barrier film of the present invention will be described with reference to the drawings.

1 to 4 are schematic cross-sectional views showing one embodiment of the barrier film of the present invention. A barrier film 100 shown in FIG. 1 includes a first film 1 that is a gas barrier film, a second film 2, an adhesive layer 4, a primer layer 5, and a matte layer 6. Here, the first film 1 includes a first base material 11 , an anchor coat layer 12 , and a barrier layer 15 consisting of an inorganic thin film layer 13 and a gas barrier coating layer 14 . The second film 2 is made up of only the second base material 21. The first film 1 and the second film 2 are bonded together via the adhesive layer 4 so that the gas barrier coating layer 14 and the second base material 21 face each other. In the barrier film 100, the primer layer 5 is disposed on the surface of the first film 1 on the first base material 11 side in contact with the first base material 11, and the matte layer 6 is disposed on the surface of the first film 1 on the first base material 11 side. The second base material 21 constituting the second film 2 is disposed on the surface of the second base material 21 opposite to the adhesive layer 4 in contact with the second base material 21 . The barrier film 100 having the structure shown in FIG. 1 improves gas barrier properties and mechanical strength by including the second film 2, and the second film 2 is composed only of the second base material 21. Therefore, the manufacturing process can be simplified, the cost can be reduced, and the thickness can be reduced compared to the barrier films shown in FIGS. 1 and 2, which will be described later.

The barrier film 200 shown in FIG. 2 includes a first film 1 that is a gas barrier film, a primer layer 5, and a matte layer 6. Here, the first film 1 includes a first base material 11 , an anchor coat layer 12 , and a barrier layer 15 consisting of an inorganic thin film layer 13 and a gas barrier coating layer 14 . In the barrier film 200, the primer layer 5 is disposed on the surface of the first film 1 on the gas barrier coating layer 14 side in contact with the first base material 11, and the matte layer 6 is disposed on the surface of the first film 1 on the gas barrier coating layer 14 side. It is arranged in contact with the second base material 21 on the surface opposite to the adhesive layer 4 of the second base material 21 constituting the film 2 . Since the barrier film 200 having the structure shown in FIG. 2 does not include the second film 2 and the adhesive layer 4, it is possible to simplify the manufacturing process, reduce costs, and reduce the thickness.

The barrier film 300 shown in FIG. 3 includes a first film 1 that is a gas barrier film, a second film 2 that is a gas barrier film, an adhesive layer 4, a primer layer 5, and a matte layer 6. Here, the first film 1 includes a first base material 11 , an anchor coat layer 12 , and a barrier layer 15 consisting of an inorganic thin film layer 13 and a gas barrier coating layer 14 . The second film 2 includes a second base material 21 , an anchor coat layer 22 , and a barrier layer 25 consisting of an inorganic thin film layer 23 and a gas barrier coating layer 24 . The first film 1 and the second film 2 are bonded together via the adhesive layer 4 so that the gas barrier coating layer 14 and the gas barrier coating layer 24 face each other. In the barrier film 300, the primer layer 5 is disposed on the surface of the first film 1 on the first base material 11 side in contact with the first base material 11, and the matte layer 6 is disposed on the surface of the first film 1 on the first base material 11 side. The second film 2 is disposed on the second base material 21 side surface of the second film 2 in contact with the second base material 21 . Since the barrier film 300 having the structure shown in FIG. 3 is made by laminating two gas barrier films, the first and second films 1 and 2, it is possible to more sufficiently suppress the permeation of moisture and oxygen. . Further, by disposing the barrier layers 15, 25 inside the first and second base materials 11, 21, the barrier layers 15, 25 are protected, and damage to the barrier layers 15, 25 is suppressed.

A barrier film 400 shown in FIG. 4 includes a first film 1 that is a gas barrier film, a second film 2 that is a gas barrier film, an adhesive layer 4, a primer layer 5, and a matte layer 6. Here, the first film 1 includes a first base material 11 , an anchor coat layer 12 , and a barrier layer 15 consisting of an inorganic thin film layer 13 and a gas barrier coating layer 14 . The second film 2 includes a second base material 21 , an anchor coat layer 22 , and a barrier layer 25 consisting of an inorganic thin film layer 23 and a gas barrier coating layer 24 . The first film 1 and the second film 2 are bonded together via the adhesive layer 4 so that the first base material 11 and the gas barrier coating layer 24 face each other. In the barrier film 400, the primer layer 5 is disposed on the gas barrier coating layer 14 side surface of the first film 1 in contact with the gas barrier coating layer 14, and the matte layer 6 is disposed on the gas barrier coating layer 14 side surface of the first film 1. It is arranged on the surface of the film 2 on the second base material 21 side, in contact with the second base material 21 . Since the barrier film 400 having the structure shown in FIG. 4 is made by laminating two gas barrier films, the first and second films 1 and 2, it is possible to more fully suppress the permeation of moisture and oxygen. . Further, by disposing the barrier layer 15 on the primer layer 5 side, that is, closer to the phosphor layer, it is possible to more sufficiently suppress moisture and oxygen from entering the phosphor layer.

The barrier films 100, 200, 300, and 400 having the above-described configurations have good gas barrier properties, and when bonded to a phosphor layer via the primer layer 5, excellent adhesion can be obtained. Further, the primer layer 5 is formed using the above-mentioned composition for forming a primer layer, and exhibits extremely good adhesion to both the first base material 11 and the gas barrier coating layer 14, and has excellent barrier properties. Peeling within the film is also sufficiently suppressed. Therefore, the barrier film having the above-described configuration can suppress oxygen and water vapor from entering through the interface between the barrier film and the phosphor layer, and can suppress deterioration of the phosphor layer.

Each layer constituting the barrier film will be described in detail below.

(Base material)
It is desirable that the first and second base materials 11 and 21 are polymer films. Examples of the material of the polymer film include polyesters such as polyethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate; polyamides such as nylon; polyolefins such as polypropylene and cycloolefin; polycarbonate; and triacetyl cellulose. but not limited to. The polymer film is preferably a polyester film, a polyamide film or a polyolefin film, more preferably a polyester film or a polyamide film, even more preferably a polyethylene terephthalate film. Polyethylene terephthalate film is desirable from the viewpoints of transparency, processability, and adhesion. Further, the polyethylene terephthalate film is preferably a biaxially stretched polyethylene terephthalate film from the viewpoints of transparency and gas barrier properties.

The polymer film may contain additives such as antistatic agents, ultraviolet absorbers, plasticizers, and slip agents, if necessary. Further, the surface of the polymer film may be subjected to corona treatment, flame treatment, or plasma treatment.

In the barrier film, when the first base material 11 and the primer layer 5 are in contact with each other, the first base material 11 preferably has a polar group such as a hydroxyl group on the surface. Since the first base material 11 has a polar group such as a hydroxyl group on its surface, the intermolecular force between the polar group such as the hydroxyl group and the functional group in the primer layer 5 further improves the adhesion. Among the above-mentioned polymer films, those that usually have hydroxyl groups on the surface include polyethylene terephthalate film, polybutylene terephthalate film, polyethylene naphthalate film, polycarbonate film, cellulose triacetate film, and the like. Further, by performing surface treatments such as corona treatment, flame treatment, and plasma treatment, the adhesion with the primer layer 5 can be further improved.

The thickness of the first and second base materials 11 and 21 is not particularly limited, but is preferably 3 μm or more and 100 μm or less, more preferably 5 μm or more and 50 μm or less. When the thickness is 3 μm or more, processing is easy, and when it is 100 μm or less, the total thickness of the barrier film can be reduced.

(Anchor coat layer)
The anchor coat layers 12 and 22 are provided between the first and second base materials 11 and 21 and the inorganic thin film layers 13 and 23 in order to improve the adhesion between them. Furthermore, the anchor coat layers 12 and 22 may have barrier properties that prevent permeation of moisture and oxygen.

The anchor coat layers 12 and 22 are made of, for example, polyester resin, isocyanate resin, urethane resin, acrylic resin, polyvinyl alcohol resin, ethylene vinyl alcohol resin, vinyl modified resin, epoxy resin, oxazoline group-containing resin, modified styrene resin, modified silicone resin. Alternatively, it can be formed using a resin selected from alkyl titanates and the like. The anchor coat layer can be formed using the above-mentioned resin alone or using a composite resin that is a combination of two or more of the above-mentioned resins.

The anchor coat layers 12 and 22 can be formed by applying a solution containing the resin described above onto the first and second base materials 11 and 21, and drying and curing the solution. Examples of the coating method include coating methods using a gravure coater, dip coater, reverse coater, wire bar coater, die coater, and the like.

The thickness of the anchor coat layers 12, 22 is preferably within the range of 5 to 500 nm, more preferably within the range of 10 to 100 nm. Here, when the thickness is 5 nm or more, the adhesion between the first and second base materials 11, 21 and the inorganic thin film layers 13, 23 and the barrier properties against moisture and oxygen tend to improve, When the thickness is 500 nm or less, it tends to be possible to form a uniform layer in which internal stress is sufficiently suppressed.

(barrier layer)
The barrier layers 15 and 25 are layers provided to further improve water vapor permeability and oxygen permeability. It is desirable that the barrier layers 15 and 25 have high transparency from an optical viewpoint. The barrier layers 15, 25 may be a single layer or a multilayer, but as shown in FIGS. 1 to 4, it is preferable to have inorganic thin film layers 13, 23 and gas barrier coating layers 14, 24. .

The barrier layers 15 and 25 may be formed in the atmosphere or in vacuum. Examples of vacuum film formation include physical vapor deposition, chemical vapor deposition, and the like. Examples of the physical vapor deposition method include a vacuum evaporation method, a sputtering method, and an ion plating method. Examples of the chemical vapor deposition (CVD) method include a thermal CVD method, a plasma CVD (PECVD) method, and a photoCVD method. The film forming method may be different between the inorganic thin film layers 13 and 23 and the gas barrier coating layers 14 and 24.

(Inorganic thin film layer)
The method for forming the inorganic thin film layers 13 and 23 is preferably a vacuum evaporation method, a sputtering method, or a PECVD method. The vacuum evaporation method is preferably a resistance heating vacuum evaporation method, an electron beam heating vacuum evaporation method, or an induction heating vacuum evaporation method, and the sputtering method is a reactive sputtering method or a dual magnetron sputtering method. is more preferable. From the viewpoint of film homogeneity, sputtering is preferred, and from the viewpoint of cost, vacuum evaporation is preferred, and can be selected depending on the purpose and application.

Examples of plasma generation methods in the sputtering method and the PECVD method include the DC (Direct Current) method, the RF (Radio Frequency) method, the MF (Middle Frequency) method, the DC pulse method, the RF pulse method, and the DC+RF superimposition method. I can do it.

In vacuum film formation, a film of metal, oxide of silicon, nitride, nitride oxide, or the like is usually formed. As the inorganic thin film layers 13 and 23, films of metals such as aluminum, titanium, copper, indium, and tin, or oxides thereof (alumina, etc.), or films of silicon or silicon oxide are preferable. In addition, a film of not only a metal or silicon oxide but also a metal or silicon nitride or nitride oxide may be formed. Furthermore, a film containing multiple metals may be formed. The above-mentioned oxides, nitrides, and nitride oxides of aluminum, titanium, copper, indium, and silicon are excellent in both transparency and barrier properties. Oxides containing silicon and nitrided oxides have high barrier properties and are particularly preferred.

The thickness of the inorganic thin film layers 13 and 23 formed by vacuum film formation is preferably 5 nm or more and 100 nm or less. When the thickness of the inorganic thin film layers 13 and 23 is 5 nm or more, better barrier properties tend to be obtained. Moreover, when the thickness of the inorganic thin film layers 13 and 23 is 100 nm or less, the occurrence of cracks can be suppressed, and there is a tendency that deterioration of water vapor barrier properties and oxygen barrier properties due to cracks can be suppressed. Furthermore, it is preferable from an economical point of view that the thickness of the inorganic thin film layers 13 and 23 is 100 nm or less, since costs can be reduced due to reductions in the amount of materials used, film formation time, and the like.

(Gas barrier coating layer)
The gas barrier coating layers 14 and 24 are provided to prevent various secondary damages in subsequent steps and to provide high barrier properties. The gas barrier coating layers 14 and 24 may contain siloxane bonds. The gas barrier coating layers 14 and 24 can also be formed in the atmosphere. When forming the gas barrier coating layers 14 and 24 in the atmosphere, for example, a polar compound such as polyvinyl alcohol, polyvinylpyrrolidone, or ethylene vinyl alcohol, a compound containing chlorine such as polyvinylidene chloride, and a compound containing Si atoms. It can be formed by applying a coating liquid containing a compound, a compound containing a Ti atom, a compound containing an Al atom, a compound containing a Zr atom, etc. onto the inorganic thin film layers 13 and 23, and drying and curing.

Specific examples of the coating method for applying the coating liquid when forming the gas barrier coating layers 14 and 24 in the atmosphere include coating methods using a gravure coater, dip coater, reverse coater, wire bar coater, die coater, etc. It will be done.

The compound containing a siloxane bond is preferably formed, for example, by using a silane compound and reacting a silanol group. Examples of such silane compounds include compounds represented by the following formula (1).
R ¹ _n (OR ² ) _4-n Si...(1)
[In the formula, n represents an integer of 0 to 3, and R ¹ and R ² each independently represent a hydrocarbon group, preferably an alkyl group having 1 to 4 carbon atoms. ]

Examples of the compound represented by the above formula (1) include tetramethoxysilane, tetraethoxysilane, tetrapropoxysilane, tetrabutoxysilane, methyltrimethoxysilane, methyltriethoxysilane, dimethyldimethoxysilane, and dimethyldiethoxysilane. etc. Polysilazane containing nitrogen may also be used.

Further, the gas barrier coating layers 14 and 24 may be made of a material made from a precursor made of other metal atoms. Examples of the compound containing a Ti atom include a compound represented by the following formula (2).
R ¹ _n (OR ² ) _4-n Ti…(2)
[In the formula, n represents an integer of 0 to 3, and R ¹ and R ² each independently represent a hydrocarbon group, preferably an alkyl group having 1 to 4 carbon atoms. ]

Examples of the compound represented by the above formula (2) include tetramethoxytitanium, tetraethoxytitanium, tetraisopropoxytitanium, and tetrabutoxytitanium.

Examples of the compound containing an Al atom include a compound represented by the following formula (3).
R ¹ _m (OR ² ) _3-m Al…(3)
[In the formula, m represents an integer of 0 to 2, and R ¹ and R ² each independently represent a hydrocarbon group, preferably an alkyl group having 1 to 4 carbon atoms. ]

Examples of the compound represented by the above formula (3) include trimethoxyaluminum, triethoxyaluminum, triisopropoxyaluminum, and tributoxyaluminum.

Examples of the compound containing a Zr atom include a compound represented by the following formula (4).
R ¹ _n (OR ² ) _4-n Zr…(4)
[In the formula, n represents an integer of 0 to 3, and R ¹ and R ² each independently represent a hydrocarbon group, preferably an alkyl group having 1 to 4 carbon atoms. ]

Examples of the compound represented by the above formula (4) include tetramethoxyzirconium, tetraethoxyzirconium, tetraisopropoxyzirconium, and tetrabutoxyzirconium.

When forming the gas barrier coating layers 14 and 24 in the atmosphere, the coating liquid is cured after being applied. Curing methods include, but are not particularly limited to, ultraviolet curing, thermosetting, and the like. In the case of ultraviolet curing, the coating solution may contain a polymerization initiator and a compound having a double bond. Further, heating aging may be performed as necessary.

Another method for forming the gas barrier coating layers 14 and 24 in the atmosphere is to form particles of inorganic oxides such as magnesium, calcium, zinc, aluminum, silicon, titanium, and zirconium through phosphorus atoms derived from phosphorus compounds. It is also possible to use a method in which a reaction product obtained by dehydration condensation is used as a gas barrier coating layer. Specifically, functional groups (e.g., hydroxyl groups) present on the surface of inorganic oxides and sites of phosphorus compounds that can react with inorganic oxides (e.g., halogen atoms directly bonded to phosphorus atoms, bonded oxygen atoms) cause a condensation reaction and bond. The reaction product can be produced, for example, by applying a coating solution containing an inorganic oxide and a phosphorus compound to the surfaces of the inorganic thin film layers 13 and 23, and heat-treating the formed coating film, so that particles of the inorganic oxide become phosphorous. It is obtained by proceeding with a bonding reaction through phosphorus atoms derived from compounds. The lower limit of the heat treatment temperature is 110°C or higher, preferably 120°C or higher, more preferably 140°C or higher, and even more preferably 170°C or higher. When the heat treatment temperature is low, it becomes difficult to obtain a sufficient reaction rate, which causes a decrease in productivity. The preferable upper limit of the heat treatment temperature varies depending on the type of base material, etc., but is preferably 220° C. or lower, and preferably 190° C. or lower. The heat treatment can be performed in air, under a nitrogen atmosphere, under an argon atmosphere, or the like.

When forming the gas barrier coating layers 14 and 24 in the atmosphere, the coating liquid may further contain a resin as long as it does not aggregate. Specific examples of the resin include acrylic resin, polyester resin, and the like. Among these resins, the coating liquid preferably contains a resin that has high compatibility with other materials in the coating liquid.

The coating liquid may further contain a filler, a leveling agent, an antifoaming agent, an ultraviolet absorber, an antioxidant, a silane coupling agent, a titanium chelating agent, and the like, as necessary.

The thickness of the gas barrier coating layers 14, 24 formed in the atmosphere is preferably 50 nm to 2000 nm, more preferably 100 nm to 1000 nm after curing. When the thickness of the gas barrier coating layers 14 and 24 formed in the atmosphere is 50 nm or more, film formation tends to be easier. When the thickness of the gas barrier coating layers 14 and 24 formed in the atmosphere is 2000 nm or less, cracking or curling tends to be suppressed.

(Adhesive layer)
As shown in FIGS. 1 and 3 to 4, the adhesive layer 4 is used to bond and laminate the first film 1 and the second film 2. is set between. As the adhesive layer 4, a common adhesive or pressure-sensitive adhesive for polymer films can be used, and it can be selected as appropriate depending on the surfaces of the first film 1 and the second film 2 to be bonded. be done. Candidates for the material of the adhesive layer 4 include epoxy-based, polyester-based, acrylic-based, rubber-based, phenol-based, and urethane-based adhesives or pressure-sensitive adhesives.

Examples of methods for applying the adhesive or pressure-sensitive adhesive include methods using a gravure coater, dip coater, reverse coater, wire bar coater, die coater, and the like.

The thickness of the adhesive layer 4 is preferably 1 μm or more and 20 μm or less. When the thickness of the adhesive layer 4 is 1 μm or more, sufficient adhesiveness tends to be obtained, and when it is 20 μm or less, the total thickness of the barrier film can be reduced, and an increase in cost can be suppressed. be.

Moreover, after the first film 1 and the second film 2 are bonded together via the adhesive layer 4, aging can be performed. Aging is performed, for example, at 20 to 80°C for 1 to 10 days.

The adhesive layer 4 may contain a curing agent, an antistatic agent, a silane coupling agent, an ultraviolet absorber, an antioxidant, a leveling agent, a dispersant, and the like, as necessary.

(Primer layer)
The primer layer 5 is a layer provided to improve the adhesion between the barrier film and the phosphor layer. The primer layer 5 is provided on the first base material 11 of the first film 1 or on the gas barrier coating layer 14. The primer layer 5 is provided on one outermost surface of the barrier film, and the surface of the barrier film on the primer layer 5 side is bonded to the phosphor layer.

The primer layer 5 is a layer made of a cured product of the above-mentioned composition for forming a primer layer. The primer layer 5 can be formed by applying a composition for forming a primer layer onto the first base material 11 of the first film 1 or the gas barrier coating layer 14 and curing the composition. Examples of the coating method include coating methods using a gravure coater, dip coater, reverse coater, wire bar coater, die coater, and the like. Curing can be performed, for example, at 60 to 150°C for 15 to 300 seconds. Further, in order to cure the primer layer 5 more fully, aging treatment may be performed at 40 to 80° C. for 1 to 7 days.

The thickness of the primer layer 5 is preferably 0.1 to 10 μm, more preferably 0.2 to 5 μm, even more preferably 0.3 to 3 μm, and even more preferably 0.5 to 1.5 μm. It is particularly preferable that When this thickness is 0.1 μm or more, the generation of pinholes can be suppressed, and since the film has a sufficient thickness, stress relaxation properties can be sufficiently exhibited, and the film formability after coating is stable, and the surface It is possible to obtain uniformly good adhesion within the area. On the other hand, if the thickness is 10 μm or less, the primer layer 5 can be prevented from becoming brittle and stable adhesion with the phosphor layer can be obtained, and the end portion of the primer layer 5 (between the barrier film and the phosphor layer) can be prevented from becoming brittle. It is possible to sufficiently suppress moisture and oxygen from entering through the primer layer (between the phosphor layer and the phosphor layer), and to suppress deterioration of the luminescent properties of the phosphor layer (particularly deterioration at the edges). Further, the thinner the primer layer 5 is, the faster the curing reaction of the primer layer 5 proceeds, and the better the initial adhesion with the phosphor layer.

(matte layer)
The matte layer 6 is provided on the surface of the barrier film opposite to the primer layer 5 in order to exhibit one or more optical functions and antistatic functions. Here, the optical function includes, but is not particularly limited to, an interference fringe (moiré) prevention function, an antireflection function, a diffusion function, and the like. Among these, it is preferable that the matte layer 6 has at least an interference fringe prevention function as an optical function. In this embodiment, a case will be described in which the matte layer 6 has at least a function of preventing interference fringes.

The mat layer 6 may include a binder resin and fine particles. The fine particles may be embedded in the binder resin so that a portion of the fine particles are exposed from the surface of the mat layer 6, so that the surface of the mat layer 6 may have minute irregularities. By providing such a matte layer 6 on the surface of the barrier film, the generation of interference fringes such as Newton's rings can be more fully prevented, and as a result, a wavelength conversion sheet with high efficiency, high definition, and long life can be obtained. becomes possible.

The binder resin is not particularly limited, but a resin with excellent optical transparency can be used. More specifically, for example, polyester resin, acrylic resin, acrylic urethane resin, polyester acrylate resin, polyurethane acrylate resin, urethane resin, epoxy resin, polycarbonate resin, polyamide resin, polyimide resin. , thermoplastic resins such as melamine resins and phenolic resins, thermosetting resins, ionizing radiation-curable resins, and the like can be used. Moreover, a silica binder can also be used in addition to the organic resin. Among these, it is desirable to use acrylic resins and urethane resins because of their wide range of materials, and it is more desirable to use acrylic resins because they have excellent light resistance and optical properties. These can be used not only one type but also in combination of multiple types.

Examples of fine particles include, but are not limited to, inorganic fine particles such as silica, clay, talc, calcium carbonate, calcium sulfate, barium sulfate, titanium oxide, and alumina, as well as styrene resin, urethane resin, silicone resin, Organic fine particles such as acrylic resin and polyamide resin can be used. Among these, it is preferable to use fine particles made of silica, acrylic resin, urethane resin, polyamide resin, etc. and having a refractive index of 1.40 to 1.55 from the viewpoint of light transmittance. Fine particles with a low refractive index are expensive, while fine particles with a too high refractive index tend to impair light transmittance. These can be used not only one type but also in combination of multiple types.

The average particle diameter of the fine particles is preferably 0.1 to 30 μm, more preferably 0.5 to 10 μm. When the average particle diameter of the fine particles is 0.1 μm or more, an excellent interference fringe prevention function tends to be obtained, and when it is 30 μm or less, transparency tends to be further improved.

The content of fine particles in the matte layer 6 is preferably 0.5 to 30% by mass, more preferably 3 to 10% by mass, based on the total amount of the matte layer 6. When the content of fine particles is 0.5% by mass or more, the light diffusion function and the effect of preventing the generation of interference fringes tend to be further improved, and when the content is 30% by mass or less, the brightness is not reduced. .

The matte layer 6 can be formed by applying a coating liquid containing the binder resin and fine particles described above onto the surface of the first film 1 or the second film 2, and drying and curing the coating liquid. Examples of the coating method include coating methods using a gravure coater, dip coater, reverse coater, wire bar coater, die coater, and the like.

The thickness of the matte layer 6 is preferably 0.1 to 20 μm, more preferably 0.3 to 10 μm. When the thickness of the matte layer 6 is 0.1 μm or more, a uniform film tends to be easily obtained, and a sufficient optical function tends to be easily obtained. On the other hand, when the matte layer 6 has a thickness of 20 μm or less, when fine particles are used in the matte layer 6, the fine particles tend to be exposed to the surface of the matte layer 6, making it easier to obtain the unevenness imparting effect.

The barrier film of this embodiment having the configuration described above can be used in applications that require barrier properties regarding the permeation of oxygen and water vapor, such as a wavelength conversion sheet containing a luminescent material used in a backlight for a liquid crystal display. In particular, it can be used as a barrier film for wavelength conversion sheets containing quantum dot light emitters.

[Wavelength conversion sheet]
Next, the wavelength conversion sheet of the present invention using the above barrier film will be explained. The wavelength conversion sheet of the present invention includes a phosphor layer containing a cured product of a phosphor and a curable resin, a first barrier film laminated on one surface of the phosphor layer, and the other side of the phosphor layer. a second barrier film laminated on the surface of the barrier film of the present invention, wherein at least the first barrier film has the primer layer on the outermost surface on the phosphor layer side. .

FIG. 5 is a schematic cross-sectional view showing one embodiment of the wavelength conversion sheet of the present invention. The wavelength conversion sheet 600 shown in FIG. 5 has a structure in which a phosphor layer 7 containing a phosphor and having a wavelength conversion function is sandwiched between a first barrier film 100a and a second barrier film 100b. Both the first barrier film 100a and the second barrier film 100b are the barrier films 100 described above. The first and second barrier films 100a, 100b and the phosphor layer 7 are laminated so that the primer layer 5 is in contact with the phosphor layer 7. In the wavelength conversion sheet 600 having such a configuration, the first and second barrier films 100a, 100b and the phosphor layer 7 are bonded together with the primer layer 5 interposed therebetween, so that excellent adhesion can be obtained. Note that the first and second barrier films 100a and 100b may be the barrier film 200, barrier film 300, or barrier film 400 described above.

(phosphor layer)
The phosphor layer 7 is a layer having a wavelength conversion function of emitting light of different wavelengths upon irradiation with excitation light, and includes at least one type of phosphor (not shown).

Among phosphors, nano-sized semiconductors called quantum dots are preferred because they provide high wavelength conversion efficiency and are excellent in brightness and color reproducibility as displays. Examples of quantum dots include those in which a core serving as a light emitting portion is covered with a shell serving as a protective film. Examples of the core include cadmium selenide (CdSe), and examples of the shell include zinc sulfide (ZnS). Quantum efficiency is improved by covering surface defects of CdSe particles with ZnS having a large band gap. Further, the phosphor may have a core double coated with a first shell and a second shell. In this case, CdSe can be used for the core, zinc selenide (ZnSe) can be used for the first shell, and ZnS can be used for the second shell. The above phosphors are used in combination of two or more types. Further, a phosphor layer containing only one type of phosphor and a phosphor layer containing only another type of phosphor may be stacked.

The phosphor is dispersed in a sealing resin for sealing. The sealing resin can be formed using, for example, a curable resin such as a UV curable resin having an ethylenic double bond or an epoxy photocationically polymerizable resin.

The phosphor layer 7 is formed by applying a mixed solution containing a phosphor, a curable resin, an optional curing agent, and an optional solvent to the primer layer 5 of one of the first and second barrier films 100a and 100b. The other of the first and second barrier films 100a and 100b is laminated with the primer layer 5 facing the phosphor layer 7, and the coating film is cured. can do.

The coating film can be cured by curing the photocurable resin by irradiating it with ultraviolet light (UV curing). Note that the photocurable resin may be further thermally cured after UV curing. By curing the curable resin, the sealing resin of the phosphor layer 7 is formed.

The wavelength conversion sheet of this embodiment described above can be used, for example, in a backlight unit. The backlight unit includes, for example, a light source, a light guide plate, a reflection plate, and the wavelength conversion sheet of this embodiment. In the backlight unit, a light guide plate and a reflection plate are arranged in this order on one surface of a wavelength conversion sheet, and a light source is arranged on the side of the light guide plate (in the surface direction of the light guide plate). For example, a blue light emitting diode element or the like is used as the light source.

[Production method of barrier film and wavelength conversion sheet]
Next, one embodiment of the method for manufacturing the barrier film and wavelength conversion sheet of the present invention will be described. The method for producing a barrier film of the present embodiment is a method for producing a barrier film comprising a gas barrier film and a primer layer disposed on the outermost surface of one of the films, and the method comprises disposing the primer layer forming composition on the gas barrier film. The method includes a step of applying a material and curing it to form the primer layer.

Further, the method for manufacturing the wavelength conversion sheet of the present embodiment includes a phosphor layer containing a phosphor and a cured product of a curable resin (sealing resin), and a barrier film laminated on both surfaces of the phosphor layer. A method for producing a wavelength conversion sheet, comprising: a first barrier film; a coating film of a composition for forming a phosphor layer containing a phosphor and a curable resin; and a second barrier film. A step of forming a laminate, and curing the curable resin in the coating film by irradiating light containing ultraviolet rays and visible light with a wavelength of 400 to 700 nm from the second barrier film side of the laminate. forming a phosphor layer. Here, at least the first barrier film is the barrier film of the present embodiment described above, which includes the primer layer on the outermost surface on the coating film side. Note that the second barrier film may also be the barrier film of this embodiment described above. The first and second barrier films may be any of the above barrier films 100, 200, 300, and 400, respectively.

When manufacturing the barrier film 100 shown in FIG. 1 and the wavelength conversion sheet 600 shown in FIG. 5 using the barrier film 100 shown in FIG. 1, it can be manufactured, for example, by the following procedure. Note that the method for forming each layer is as described above. First, a first film 1 and a second film 2 are each produced. That is, the first film 1 is produced by forming the anchor coat layer 12 on the first base material 11, and sequentially forming the inorganic thin film layer 13 and the gas barrier coating layer 14 thereon. As the second film 2, the second base material 21 is used as is.

The first film 1 and the second film are separated by applying an adhesive or pressure-sensitive adhesive on the gas barrier coating layer 14 of the obtained first film 1, bonding it to the second film 2, and aging it. A laminated film is obtained in which 2 and 2 are bonded together with the adhesive layer 4 interposed therebetween. The bonding can be performed using a general laminating device. Note that the adhesive or pressure-sensitive adhesive may be applied onto the second film 2.

The primer layer forming composition of the present embodiment described above is applied onto the first base material 11 of the obtained laminated film and cured to form the primer layer 5. Further, a mat layer 6 is formed on the second film 2 of the laminated film. The order in which the primer layer 5 and matte layer 6 are formed is not particularly limited. Further, the matte layer 6 may be formed on the second film 2 in advance before the first film 1 and the second film 2 are bonded together. Furthermore, the primer layer 5 may be formed in advance on the first base material 11 of the first film 1 before bonding the first film 1 and the second film 2 together. Thereby, barrier film 100 is obtained. Two of these barrier films 100 are produced, and are respectively referred to as a first barrier film 100a and a second barrier film 100b.

Next, on the primer layer 5 of the first barrier film 100a, a mixed solution containing a phosphor, a curable resin, an optional curing agent, and an optional solvent is applied to form a coating film. The primer layer 5 side of the second barrier film 100b is bonded thereon to obtain a laminate. Next, by irradiating the obtained laminate with light including ultraviolet rays and visible light with a wavelength of 400 to 700 nm from the second barrier film 100b side, the curable resin in the coating film is cured to form the phosphor layer 7. form. At this time, since the irradiated light includes ultraviolet rays and visible light with a wavelength of 400 to 700 nm, the curable resin in the coating film is cured by the ultraviolet rays, and the visible light that has passed through the coating film is used to cure the first barrier film 100a. It reaches the primer layer 5, and due to the action of the photopolymerization initiator, the reaction between the resin having reactive carbon-carbon double bonds in the primer layer 5 and the curable resin in the coating film progresses, resulting in excellent adhesion. is obtained. The primer layer 5 of the second barrier film 100b is directly irradiated with visible light, so that the reaction between the resin having reactive carbon-carbon double bonds in the primer layer 5 and the curable resin in the coating film progresses. Excellent adhesion can be obtained. Note that if the photopolymerization initiator contained in the primer layer 5 of the second barrier film 100b is also sensitive to ultraviolet rays, the above-mentioned reaction will proceed also by directly irradiated ultraviolet rays. By the above method, it is possible to obtain the wavelength conversion sheet 600 of this embodiment, which has good gas barrier properties and excellent adhesion between the first and second barrier films 100a, 100b and the phosphor layer 7.

The light to be irradiated when curing the coating film is preferably light containing both ultraviolet rays (for example, wavelengths of 250 to 380 nm) and visible light with wavelengths of 400 to 700 nm from one light source; Light that does not substantially contain ultraviolet rays and light that includes visible light but does not substantially contain ultraviolet rays may be irradiated from separate light sources. Examples of the light source include a metal halide lamp, a high-pressure mercury lamp, and a mercury-xenon lamp.

The coating film preferably has a minimum visible light transmittance of 30% or more, preferably 35% or more, at a wavelength of 400 to 700 nm at a coating thickness corresponding to the thickness of the phosphor layer 7 to be formed. It is more preferable that it is 50% or more, even more preferably that it is 70% or more. The larger the minimum value of the visible light transmittance, the easier it is for visible light to reach the first barrier film 100a during light irradiation, and the adhesion between the primer layer and the phosphor layer can be improved more efficiently.

The coating film preferably has a visible light transmittance of 30% or more at a wavelength of 405 nm, more preferably 35% or more, at a coating thickness corresponding to the thickness of the phosphor layer 7 to be formed. It is more preferably 50% or more, particularly preferably 70% or more. The larger the visible light transmittance at a wavelength of 405 nm, the easier it is for the visible light at a wavelength of 405 nm to reach the first barrier film 100a during light irradiation, and the more efficiently the adhesion between the primer layer and the phosphor layer can be improved. can.

The coating film may have a maximum value of ultraviolet transmittance at a wavelength of 200 to 380 nm of less than 30%, but not more than 25%, at a coating thickness corresponding to the thickness of the phosphor layer 7 to be formed. It may be 20% or less. Even if the ultraviolet transmittance of the coating film is low as described above, if the primer layer is formed using the composition for forming a primer layer of this embodiment, the reaction proceeds with visible light, so the primer layer It is possible to obtain excellent adhesion between the phosphor layer and the phosphor layer.

In this specification, the visible light transmittance and ultraviolet transmittance of the coating film mean values measured by the following method. That is, two polypropylene films (PP films) are prepared, a composition for forming a phosphor layer is applied onto one PP film to form a coating film, and the other PP film is laminated thereon to form a test piece. Create. The thickness of the coating film corresponds to the thickness of the phosphor layer 7 to be formed. On the other hand, a control test piece is prepared by laminating two polypropylene films together without sandwiching the coating film between them. The light transmittance of the obtained test piece and control test piece at a wavelength of 200 to 700 nm is measured using an ultraviolet-visible spectrophotometer, and from the results, the light transmittance of the coating film at each wavelength is calculated using the following formula. As a result, the minimum value of visible light transmittance at a wavelength of 400 to 700 nm, the visible light transmittance at a wavelength of 405 nm, and the maximum value of ultraviolet transmittance at a wavelength of 200 to 380 nm can be determined.
Light transmittance of coating film (%) = (light transmittance of test piece / light transmittance of control test piece) × 100

Although the preferred embodiments of the present invention have been described in detail above, the technical scope of the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention. It is.

For example, in the barrier films shown in FIGS. 1 to 5, the mat layer 6 and the anchor coat layers 12 and 22 may not be provided.

In the barrier films shown in FIGS. 1 to 5, the barrier layers 15 and 25 may be formed by alternately laminating a plurality of inorganic thin film layers 13 and 23 and gas barrier coating layers 14 and 24. In this case, gas barrier properties can be further improved.

In the barrier films shown in FIGS. 1 to 5, the orientations of the first film 1 and the second film 2 are not limited to the directions shown, and may be arranged in opposite directions.

In addition to the first film and the second film, the barrier film may further include one or more films having a similar configuration. For example, in the barrier films 300 and 400 shown in FIGS. 3 and 4, a third film made only of a base material may be further provided between the second film 2 and the matte layer 6.

In the barrier film shown in FIG. 1, the second film 2 and adhesive layer 4 may not be provided. In the barrier film shown in FIG. 2, the second base material 21 is bonded to the first base material 11 via the adhesive layer 4 between the mat layer 6 and the first base material 11. A second film 2 may also be provided.

In the wavelength conversion sheet shown in FIG. 5, the pair of barrier films sandwiching the phosphor layer 7 may have different configurations. Moreover, the matte layer 6 does not necessarily need to be provided on both sides of the wavelength conversion sheet, and may be provided only on one surface.

EXAMPLES Hereinafter, the present invention will be described in more detail based on Examples and Comparative Examples, but the present invention is not limited to the following Examples.

Photopolymerization initiators A to D shown in Table 1 below were prepared as photopolymerization initiators used in Examples and Comparative Examples. Table 1 shows the absorption coefficient of each wavelength and the maximum absorption coefficient in the visible light region of wavelengths 400 to 700 nm.

[Example 1]
(Preparation of composition for forming primer layer)
Acryloyl group-containing resin (manufactured by Arakawa Chemical Co., Ltd., model number: ACS-719, resin having an acryloyl group and a secondary hydroxyl group, (meth)acrylic equivalent weight 214 g/eq, which is a resin having a reactive carbon-carbon double bond) hydroxyl value 262mgKOH/g) 50 parts by mass, and acrylic polyol (manufactured by Arakawa Chemical Co., Ltd., model number: ACS-717, hydroxyl value) which is a resin having primary hydroxyl groups without having a reactive carbon-carbon double bond. 1,000 parts by mass of a solvent (ethyl acetate) was added to 50 parts by mass (80 mgKOH/g), and the mixture was stirred at 25° C. for 2 hours. Thereafter, 15 parts by mass of biuret-type hexamethylene diisocyanate (manufactured by Arakawa Chemical Co., Ltd., trade name: ARACOAT CL106) as a curing agent and 2 parts by mass of photopolymerization initiator A were added, and the mixture was stirred at 25°C for 30 minutes. A composition for forming a primer layer was obtained.

The (meth)acrylic equivalent of the entire resin component excluding the polyisocyanate compound, photopolymerization initiator, and solvent in the composition for forming a primer layer was 428 g/eq, and the hydroxyl value was 171 mgKOH/g. The above (meth)acrylic equivalent and hydroxyl value were determined by the following method. The (meth)acrylic equivalent was calculated from the (meth)acrylic equivalent of the resin having a reactive carbon-carbon double bond and its blending ratio. The hydroxyl value is calculated from the hydroxyl value of a resin that has a reactive carbon-carbon double bond, the hydroxyl value of a resin that does not have a reactive carbon-carbon double bond and has a primary hydroxyl group, and their blending ratio. Ta. Further, the NCO/OH ratio of the composition for forming a primer layer was 0.48.

(Preparation of barrier film)
A polyester resin solution is applied by a bar coating method onto the corona discharge treated surface of a biaxially oriented polyethylene terephthalate film (product name: P60, thickness: 16 μm, manufactured by Toray Industries, Inc.), one side of which has been subjected to a corona discharge treatment. An anchor coat layer with a thickness of 100 nm was formed by drying and curing at 80° C. for 1 minute.

A silicon oxide material (manufactured by Canon Optron Inc.) was evaporated by electron beam heating under a pressure of 1.5 × 10 ^-2 Pa using an electron beam heating type vacuum evaporation device to form an inorganic thin film on the anchor coat layer. A SiOx film with a thickness of 80 nm was formed as a layer. Note that the accelerating voltage during vapor deposition was 40 kV, and the emission current was 0.2 A. On this SiOx film, a coating solution containing a hydrolyzate of tetraethoxysilane (containing siloxane bonds) and polyvinyl alcohol mixed in a mass ratio of 1:1 was applied using a bar coating method, and dried and cured at 120°C for 1 minute. A gas barrier coating layer having a thickness of 400 nm was formed. In this way, a first film was obtained. The water vapor permeability of the first film was 0.5 g/(m ² ·day).

An adhesive (base material: Takelac A525, curing agent: Takenate A50, manufactured by Mitsui Chemicals, Inc.) is applied on the gas barrier coating layer of the first film to form an adhesive layer, and a biaxially oriented polyethylene film is used as the second film. The corona discharge treated surfaces of terephthalate film (product name: FE2001, thickness: 25 μm, manufactured by Futamura Chemical Co., Ltd., water vapor permeability 25 g/(m ² · day)) were bonded together and aged at 40°C for 2 days. did. Thereby, a laminated film (1) in which the first film and the second film were bonded together via the adhesive layer was obtained. The thickness of the adhesive layer was 4 μm.

On the polyethylene terephthalate film (first base material) of the first film in the obtained laminated film (1), the composition for forming a primer layer is applied with a wire bar coater to form a coating film. After drying and curing in an oven at 100°C for 20 seconds, a primer layer was formed by aging at 40°C for 3 days. The thickness of the primer layer was 1 μm.

Further, on the polyethylene terephthalate film (second base material) of the second film, 100 parts by mass of an acrylic polyol resin (manufactured by DIC Corporation, trade name: Acridic A-814) and an isocyanate-based curing agent (manufactured by DIC Corporation, product name: Acridic A-814) were added. , trade name: Burnock DN-980, a composition for forming a matte layer consisting of 8.5 parts by mass of hexamethylene diisocyanate-based compound), 10 parts by mass of fine particles (polyurethane, average particle size 2 μm), and 70 parts by mass of a solvent (ethyl acetate). was coated and cured by heating and drying to form a matte layer with a thickness of 3 μm. Thereby, a barrier film having the configuration shown in FIG. 1 was obtained. Two sheets of this barrier film were prepared and used as a first barrier film and a second barrier film, respectively.

(Preparation of wavelength conversion sheet)
On the primer layer of the first barrier film, the core is cadmium selenide (CdSe), the shell is zinc sulfide (ZnS), a quantum dot light emitter with a particle size of 6 nm, and an acryloyl group at the end of the main chain or side chain. A phosphor layer forming composition containing an acrylic photocurable resin (manufactured by Hitachi Chemical Co., Ltd., trade name: Hitaloid 7927-8) and a photopolymerization initiator (manufactured by BASF, trade name: Lucirin TPO) was used. The coating was applied to form a coating film, and the primer layer of the second barrier film was laminated thereon. The obtained laminate is irradiated with light from the second barrier film side using an ultraviolet irradiation device (light source: high-pressure mercury lamp) at an exposure dose of 300 mJ/cm ² , 600 mJ/cm ² or 600 mJ/cm ² The coating film was thereby cured to form a phosphor layer (thickness: 100 μm) having a wavelength conversion function. Note that FIG. 6 shows the spectrum of the light used for exposure. As shown in FIG. 6, the light used for exposure includes visible light and ultraviolet light.

Further, the visible light transmittance of the above coating film was measured by the following method. Two polypropylene films (PP films) are prepared, a composition for forming a phosphor layer is applied on one PP film to form a coating film, and the other PP film is bonded thereto to create a test piece. did. The thickness of the coating film was the same as when producing the wavelength conversion sheet (the coating thickness at which a phosphor layer with a thickness of 100 μm was formed). In addition, a control test piece was prepared by bonding two polypropylene films together without sandwiching the coating film between them. The light transmittance of the obtained test piece and control test piece at a wavelength of 200 to 700 nm was measured using a JASCO V-650 spectrometer (manufactured by JASCO Corporation). A graph of the obtained light transmittance is shown in FIG. From this measurement result, the light transmittance of the coating film at each wavelength was calculated using the following formula, and the minimum value of the light transmittance in the visible light region of wavelengths 400 to 700 nm was determined. As a result, the minimum visible light transmittance was 35%. Further, the maximum value of ultraviolet transmittance in the wavelength range of 200 to 380 nm was 25%.
Light transmittance of coating film (%) = (light transmittance of test piece / light transmittance of control test piece) × 100

[Example 2]
A composition for forming a primer layer, a barrier film, and a wavelength conversion sheet were obtained in the same manner as in Example 1 except that photoinitiator B was used instead of photoinitiator A.

[Comparative example 1]
A composition for forming a primer layer, a barrier film, and a wavelength conversion sheet were obtained in the same manner as in Example 1 except that photoinitiator C was used instead of photoinitiator A.

[Comparative example 2]
A composition for forming a primer layer, a barrier film, and a wavelength conversion sheet were obtained in the same manner as in Example 1 except that photoinitiator D was used instead of photoinitiator A.

<Evaluation of adhesion>
The wavelength conversion sheets obtained in Examples and Comparative Examples were cut into strips of 25 mm x 100 mm, and the cut wavelength conversion sheets were fixed on a glass plate. The barrier film of the fixed strip-shaped wavelength conversion sheet was tested at 300 mm/min in the direction perpendicular to the glass plate using a tensile tester (manufactured by Shimadzu Corporation, product name: Autograph AG-X). It was peeled off from the phosphor layer at a high speed, and the force required for peeling was measured as the peel strength. The peel strength was measured between the second barrier film and the phosphor layer on the light irradiation side, and between the first barrier film and the phosphor layer on the opposite side to the light irradiation side. went.

Further, assuming that the sheets were left in a high temperature and high humidity environment for a long time, as a reliability test, the wavelength conversion sheets obtained in Examples and Comparative Examples were stored at 65° C. and 95% RH for 500 hours. Using the wavelength conversion sheet after the reliability test, peel strength was measured in the same manner as above. Table 2 shows the measurement results of peel strength before and after the reliability test.

DESCRIPTION OF SYMBOLS 1... First film, 2... Second film, 4... Adhesive layer, 5... Primer layer, 6... Matte layer, 7... Fluorescent layer, 11... First base material, 21... Second base material , 12,22...Anchor coat layer, 13,23...Inorganic thin film layer, 14,24...Gas barrier coating layer, 15,25...Barrier layer, 100,200,300,400...Barrier film, 100a...First barrier Film, 100b...Second barrier film, 600...Wavelength conversion sheet.

Claims (9)

A composition for forming a primer layer for forming a primer layer adjacent to a phosphor layer of an optical laminate, comprising:
A resin having a reactive carbon-carbon double bond, a resin having a primary hydroxyl group without having a reactive carbon-carbon double bond, a polyisocyanate compound, and a maximum absorption coefficient in the visible light region of wavelengths 400 to 700 nm. contains a photopolymerization initiator whose is 100 ml/(g cm) or more,
The resin having a reactive carbon-carbon double bond is a polymer having a reactive carbon-carbon double bond in the molecule,
The (meth)acrylic equivalent of the entire resin component contained in the primer layer forming composition is 200 to 1000 g/eq,
A composition for forming a primer layer, wherein the hydroxyl value of the entire resin component contained in the composition for forming a primer layer is 100 to 300 mgKOH/g . The composition for forming a primer layer according to claim 1, wherein the content of the photopolymerization initiator is 0.1 to 5% by mass based on the total solid content of the composition for forming a primer layer. The composition for forming a primer layer according to claim 1 or 2, having an NCO/OH ratio of 0.1 to 0.6. The composition for forming a primer layer according to any one of claims 1 to 3, wherein the (meth)acrylic equivalent of the entire resin component contained in the composition for forming a primer layer is 270 to 800 g/eq. The composition for forming a primer layer according to any one of claims 1 to 4, wherein the hydroxyl value of the entire resin component contained in the composition for forming a primer layer is 150 to 230 mgKOH/g. gas barrier film,
A primer layer made of a cured product formed using the primer layer forming composition according to any one of claims 1 to 5, disposed on one outermost surface of the barrier film;
A barrier film comprising: a phosphor layer containing a cured product of a phosphor and a curable resin; a first barrier film laminated on one surface of the phosphor layer; and a first barrier film laminated on the other surface of the phosphor layer. 2 barrier film;
The wavelength conversion sheet, which is a barrier film according to claim 6, wherein the first barrier film includes the primer layer on the outermost surface on the phosphor layer side. forming a laminate including a first barrier film, a coating film of a composition for forming a phosphor layer containing a phosphor and a curable resin, and a second barrier film;
A step of curing the curable resin in the coating film by irradiating light containing ultraviolet rays and visible light with a wavelength of 400 to 700 nm from the second barrier film side of the laminate to form a phosphor layer. and,
The method for producing a wavelength conversion sheet, which is a barrier film according to claim 6, wherein the first barrier film includes the primer layer on the outermost surface on the coating side. The method for producing a wavelength conversion sheet according to claim 8, wherein the coating film has a minimum visible light transmittance of 30% or more in a wavelength range of 400 to 700 nm.

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