JP2020160212A - Primer layer formation composition, barrier film and wavelength conversion sheet and method for manufacturing wavelength conversion sheet - Google Patents

Abstract

To provide a primer layer formation composition for forming a primer layer capable of obtaining excellent adhesion to a phosphor layer, maintaining the excellent adhesion even when placed in a high temperature and high humidity environment for a long time and obtaining the excellent adhesion even when arranged on the side opposite to a side of exposing the phosphor layer when curing the phosphor layer by single side exposure.SOLUTION: The primer layer formation composition for forming a primer layer adjacent to the phosphor layer of an optical laminate comprises: 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 photoinitiator having the maximal absorption coefficients of 100 ml/(g cm) or more in a visible light region having a wavelength of 400-700 nm.SELECTED DRAWING: None

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 are deteriorated by contact with oxygen or water vapor. Therefore, the wavelength conversion sheet often adopts a structure in which a barrier film having a gas barrier layer formed on a polymer film is arranged on one or both sides of a phosphor layer containing a phosphor.

For example, in Patent Document 1, barrier films are attached to both sides of a phosphor layer in which quantum dots are dispersed in an acrylic resin and an epoxy resin to prevent 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 as described in Patent Document 1, are dispersed, has poor adhesion to the barrier film and may cause peeling between the phosphor layer and the barrier film. there were. Further, not only in the quantum dot film as described in Patent Document 1, but also 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 influence on performance deterioration. , It is required to improve the adhesion between the barrier film and the phosphor layer. Further, when the optical laminate is left in a high temperature and high humidity environment for a long time, peeling between the phosphor layer and the barrier film is more likely to occur, and moisture and oxygen are released from the sheet edge due to this peeling. There is a problem that it invades and the light emitting characteristics of the phosphor layer are easily deteriorated. Therefore, the optical laminate is required to be able to maintain excellent adhesion between the phosphor layer and the barrier film even when it is left in a high temperature and high humidity environment for a long time.

Further, when the optical laminate is manufactured, the phosphor layer may be cured by irradiation with ultraviolet rays. Therefore, the present inventor provides primer layers on the surfaces of the pair of barrier films that sandwich the phosphor layer in contact with the phosphor layers, and reacts the components in the primer layer with the components in the phosphor layer during the ultraviolet irradiation. We investigated a method for improving 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 present inventor has found that the effect of improving adhesion may not be sufficiently obtained. It is considered that this is 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 film on both sides by performing double-sided exposure on the optical laminate, but there are many restrictions 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 above-mentioned problems of the prior art, and has excellent adhesion to the phosphor layer and also has excellent adhesion even when left in a high temperature and high humidity environment for a long time. Further, when the phosphor layer is cured by single-sided exposure, it is possible to form a primer layer capable of obtaining excellent adhesion even if it is arranged on the side opposite to the exposed side of the phosphor layer. It is an object of the present invention to provide a composition for forming a primer layer, a barrier film provided with a primer layer formed using the same, a wavelength conversion sheet provided with the barrier film, and a method for producing the wavelength conversion sheet.

In order to achieve the above object, 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 is a resin having a reactive carbon-carbon double bond. A resin having a primary hydroxyl group without a reactive carbon-carbon double bond, a polyisocyanate compound, and a maximum absorption coefficient in the visible light region having a wavelength of 400 to 700 nm are 100 ml / (g · cm) or more. A composition for forming a primer layer containing a photopolymerization initiator is provided.

According to the primer layer forming composition, the two types of resins having the specific structure, the polyisocyanate compound, and the maximum absorption coefficient in the visible light region having a wavelength of 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 excellent adhesion can be maintained even when left in a high temperature and high humidity environment for a long time. When the phosphor layer is cured by single-sided exposure, it is possible to form a primer layer capable of obtaining excellent adhesion even if it is arranged on the side opposite to the exposed side of the phosphor layer. We believe that the above effects are achieved for the following reasons. That is, by containing the above two types of resins having a specific structure and the polyisocyanate compound, a dense crosslinked structure is formed in the primer layer, and excellent adhesion between the primer layer and the phosphor layer is obtained. The crosslinked structure is maintained even when the compound is left in a high temperature and high humidity environment for a long time, and excellent adhesion is maintained. Further, since the specific photopolymerization initiator has sufficient sensitivity to visible light, it is arranged on the side opposite to the exposed side of the fluorescent material layer when the fluorescent material layer is cured by single-sided exposure. However, it is possible to form a primer layer capable of obtaining excellent adhesion to the phosphor layer. This is because the phosphor layer absorbs ultraviolet rays but easily transmits visible light, so that the visible light reaches the primer layer arranged on the side opposite to the exposed side, and the photopolymerization initiator having sensitivity to visible light. Due to the action, the reaction between the components such as the resin having a reactive carbon-carbon double bond in the primer layer and the components such as the ultraviolet (UV) curable resin in the phosphor layer proceeds, and the adhesion between the layers is improved. This is to improve.

By forming a primer layer using the above composition for forming a primer layer by the above-mentioned action, peeling occurs between the phosphor layer and the barrier film even when the primer layer is left in a high temperature and high humidity environment for a long time. It is difficult to prevent moisture and oxygen from invading from the edge of the sheet and deteriorating the light emitting characteristics of the phosphor layer. Furthermore, by forming a dense crosslinked structure in the primer layer, it is possible to suppress the invasion of water and oxygen from the edge of the sheet through the primer layer itself, and prevent deterioration of the light emitting characteristics of the phosphor layer. Can be done. In addition, since the composition for forming a primer layer contains a resin having a primary hydroxyl group without having a reactive carbon-carbon double bond, a hydroxyl group is contained in the primer layer, and the presence of this hydroxyl group makes it particularly effective. When the phosphor layer is formed by using an epoxy resin or a resin containing polyisocyanate, the adhesion between the primer layer and the phosphor layer is further improved.

In the primer layer forming composition, the content of the photopolymerization initiator is preferably 0.1 to 5% by mass based on the total solid content of the primer layer forming composition. When the content of the photopolymerization initiator is within the above range, the formed primer layer can obtain better adhesion to the phosphor layer and can be left in a high temperature and high humidity environment for a long time. It is possible to maintain better adhesion, and when the phosphor layer is cured by single-sided exposure, even if it is arranged on the side opposite to the exposed side of the phosphor layer, better adhesion can be obtained. Can be done.

The NCO / OH ratio of the primer layer forming composition is preferably 0.1 to 0.6. When the NCO / OH ratio is 0.1 or more, a sufficient crosslinked structure is formed in the obtained primer layer, and the phosphor layer and the primer layer adhere to each other when left in a high temperature and high humidity environment for a long time. The decline in sex is more sufficiently suppressed. On the other hand, when the NCO / OH ratio is 0.6 or less, sufficient hydroxyl groups remain in the primer layer, and particularly when the phosphor layer is formed by using an epoxy resin or a resin containing polyisocyanate. The 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. Reactive carbon-carbon double bonds show strong adhesion to UV-curable phosphor layers by being incorporated into the curing system of the phosphor layers during UV curing, while reactive carbon-carbon double bonds If there are many components, the wettability of the primer layer tends to decrease. Therefore, it is considered that the abundance of the reactive carbon-carbon double bond has an optimum range. 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, a sufficient reactive carbon-carbon double bond is present, and particularly excellent adhesion between the phosphor layer and the primer layer using a UV curable resin. 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 to the phosphor layer can be 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 hydroxyl value is 150 mgKOH / g or more, cross-linking with a polyisocyanate compound is sufficiently performed at the time of forming the primer layer, and the cross-linked structure is maintained even when left in a high temperature and high humidity environment for a long time, and fluorescence The excellent adhesion between the body layer and the primer layer is more sufficiently maintained. On the other hand, when the hydroxyl value is 230 mgKOH / g or less, it is possible to prevent excessive hydroxyl groups from remaining in the primer layer and easily permeating 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 of the above.

The present invention also provides a barrier film comprising a gas barrier film and a primer layer composed of a cured product formed by using the primer layer forming composition of the present invention arranged on one of the outermost surfaces. .. According to the barrier film, by providing the primer layer, excellent adhesion to the phosphor layer can be obtained through the primer layer, and it is also excellent even when it is left in a high temperature and high humidity environment for a long time. Furthermore, when the phosphor layer is cured by single-sided exposure, excellent adhesion can be obtained even if the phosphor layer is arranged on the side opposite to the exposed side.

The present invention also comprises 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 on the other surface of the phosphor layer. Provided is a wavelength conversion sheet, which comprises a second barrier film laminated on the above, and the first barrier film is the barrier film of the present invention having the primer layer on the outermost surface on the phosphor layer side. To do. According to the wavelength conversion sheet, since the first barrier film and the phosphor layer are laminated via the primer layer, excellent adhesion between the first barrier film and the phosphor layer can be obtained. Excellent adhesion can be maintained even when the phosphor layer is left in a high temperature and high humidity environment for a long time, and even when exposed from the second barrier film side when the phosphor layer is cured by single-sided exposure. Excellent adhesion between the first barrier film and the phosphor layer can be obtained.

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

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

According to the present invention, excellent adhesion to the phosphor layer can be obtained, excellent adhesion can be maintained even when the fluorescent material is left in a high temperature and high humidity environment for a long time, and further, the fluorescent material can be maintained by single-sided exposure. A composition for forming a primer layer capable of forming a primer layer capable of obtaining excellent adhesion even if it is arranged on the side opposite to the exposed side of the phosphor layer when the layer is cured, and formed using the same. It is possible to provide a barrier film provided with the primer layer, a wavelength conversion sheet provided with the barrier film, and a method for producing the wavelength conversion sheet.

It is a schematic cross-sectional view which shows one Embodiment of the barrier film of this invention. It is a schematic cross-sectional view which shows one Embodiment of the barrier film of this invention. It is a schematic cross-sectional view which shows one Embodiment of the barrier film of this invention. It is a schematic cross-sectional view which shows one Embodiment of the barrier film of this invention. It is a schematic cross-sectional view which shows one Embodiment of the wavelength conversion sheet of this invention. It is a graph which shows the spectrum of the light used for the exposure of a laminated body in an Example and a comparative example. It is a graph which shows the light transmittance of the coating film in an Example and a comparative example.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings in some cases. In the drawings, the same or corresponding parts are designated by the same reference numerals, and duplicate description will be omitted. Further, the dimensional ratio of the drawings is not limited to the ratio shown.

[Composition for forming a primer layer]
The primer layer forming composition of the present invention is a primer layer forming composition for forming a primer layer adjacent to the phosphor layer of the optical laminate, and is a resin having a reactive carbon-carbon double bond. A resin having a primary hydroxyl group without a reactive carbon-carbon double bond, a polyisocyanate compound, and light having a maximum absorption coefficient of 100 ml / (g · cm) or more in the visible light region having a wavelength of 400 to 700 nm. It contains a polymerization initiator. Hereinafter, each component will be described in detail.

(Resin having a reactive carbon-carbon double bond)
The reactive carbon-carbon double bond refers to a carbon-carbon double bond 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, more preferably, for example, a styryl group or a (meth) acryloyl group, and (meth). It is more preferably an acryloyl group, and particularly preferably an acryloyl group. When the group having a reactive carbon-carbon double bond is an acryloyl group, the reactivity in the primer layer and the reactivity with the phosphor layer are improved, and there is a tendency that better adhesion can be obtained.

Examples of the resin having a reactive carbon-carbon double bond include a polymer having a reactive carbon-carbon double bond in the molecule. Examples of the above-mentioned polymer include a polymer in which a reactive carbon-carbon double bond is introduced into a side chain of a polymer obtained by polymerizing one or more kinds of polymerizable monomers. It is not limited to this. As the resin having a reactive carbon-carbon double bond, one kind may be used alone or two or more kinds may be used in combination.

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 preferable. When the weight average molecular weight is 300 or more, the film forming property tends to be good, and when it is 100,000 or less, the 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 by 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, and more preferably 214 to 290 g / eq. When 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 a preferable range described later, 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 100 to 300 mgKOH / g, more preferably 130 to 270 mgKOH / g. When the hydroxyl value of the resin having a reactive carbon-carbon double bond is within the above range, the hydroxyl value of the entire resin component can be easily adjusted within the preferable range described later, and the resin is left in a high temperature and high humidity environment for a long time. Even in this case, it is easy to maintain excellent adhesion between the phosphor layer and the primer layer, and it is easy to prevent deterioration of the light emitting characteristics of the phosphor layer.

(Resin that does not have a reactive carbon-carbon double bond and has a primary hydroxyl group)
Examples of the resin having no reactive carbon-carbon double bond and having a primary hydroxyl group include a polymer having no reactive carbon-carbon double bond and having a primary hydroxyl group in the molecule. Examples of the polymer include polymers using a monomer containing a (meth) acryloyl group such as hydroxyalkyl (meth) acrylate and pentaerythritol triacrylate and a primary hydroxyl group as a monomer component. However, it is not limited to this. As the resin having no reactive carbon-carbon double bond and having a primary hydroxyl group, one type can be used alone or two or more types can be used in combination.

The weight average molecular weight of the resin having no reactive carbon-carbon double bond and having a primary hydroxyl group is preferably 300 to 100,000, more preferably 500 to 50,000, and 1,000. It is particularly preferably ~ 30,000. When the weight average molecular weight is 300 or more, the film forming property tends to be good, and when it is 100,000 or less, the coating suitability tends to be good.

The hydroxyl value of the resin having no reactive carbon-carbon double bond and having a primary hydroxyl group is preferably 10 to 150 mgKOH / g, more preferably 30 to 100 mgKOH / g. When the hydroxyl value of the resin having a primary hydroxyl group without a reactive carbon-carbon double bond is within the above range, the hydroxyl value of the entire resin component can be easily adjusted within a preferable range described later, and the temperature and humidity are high. Even when it is left in an environment for a long time, it is easy to maintain excellent adhesion between the phosphor layer and the primer layer, and it is easy to prevent deterioration of the light emitting characteristics of the phosphor layer.

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

In the primer layer forming composition, the (meth) acrylic equivalent of the entire resin component is preferably 200 to 1000 g / eq, more preferably 250 to 900 g / eq, and preferably 270 to 800 g / eq. More preferably, it is 280 to 500 g / eq. When the (meth) acrylic equivalent is 1000 g / eq or less, the reactive carbon-carbon double bond is sufficiently present in the resin component, and in particular, the phosphor layer and the primer layer using the UV curable resin are used. 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 to the phosphor layer can be obtained. In the present specification, the resin component means the entire resin contained in the primer layer forming composition, and has at least a resin having a reactive carbon-carbon double bond and a reactive carbon-carbon double bond. It is a component containing a resin having a primary hydroxyl group. Components other than the resin, such as polyisocyanate compounds, photopolymerization initiators, and additives described later, are not included in the resin components. Further, in the present specification, the (meth) acrylic equivalent of the entire resin component is, for example, the (meth) acrylic equivalent of a resin having a reactive carbon-carbon double bond and the reactive carbon in the total content of the resin component. -It can be calculated from the proportion of resin having a carbon double bond. Alternatively, the (meth) acrylic equivalent of the entire resin component can be obtained by comparison with a calibration curve of a substance having a known concentration by infrared spectroscopy or Raman spectroscopy.

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, and even more preferably 150 to 230 mgKOH / g. , 170-220 mgKOH / g is particularly preferable. When the hydroxyl value is 100 mgKOH / g or more, cross-linking with a polyisocyanate compound is sufficiently performed at the time of forming the primer layer, and the cross-linked structure is maintained even when left in a high temperature and high humidity environment for a long time, and fluorescence The excellent adhesion between the body layer and the primer layer is more sufficiently maintained. On the other hand, when the hydroxyl value is 300 mgKOH / g or less, it is possible to prevent excessive hydroxyl groups from remaining in the primer layer and easily permeating 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 of the above. In the present specification, the hydroxyl value of the entire resin component has, for example, the hydroxyl value of a resin having a reactive carbon-carbon double bond and the primary hydroxyl group having no reactive carbon-carbon double bond. It can be calculated from the hydroxyl value of the resins and the ratio of those resins to the total content of the resin components. Alternatively, the hydroxyl value of the entire resin component can be determined by infrared spectroscopy or Raman spectroscopy by comparison with a calibration curve of a substance having a known concentration.

(Polyisocyanate compound)
Examples of the polyisocyanate compound include tolylene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, and xylylene diisocyanate, and those using them 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 an alcohol. The polyisocyanate compound may be an isocyanurate type, a burette type, an adduct type, or a polyisocyanate compound such as a bifunctional type (a mixture of two types of polyisocyanate compounds). Among these, isocyanurate-type and burette-type polyisocyanate compounds are preferable from the viewpoint of adhesion. The polyisocyanate compound may be used alone or in combination of two or more.

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

(Photopolymerization initiator)
The photopolymerization initiator has a maximum absorption coefficient of 100 ml / (g · cm) or more in the visible light region having 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 obtained primer layer cures the phosphor layer by single-sided exposure. Even if it is arranged on the side opposite to the exposed side of the phosphor layer, visible light passes through the phosphor layer and reaches the primer layer, so that excellent adhesion to the phosphor layer is obtained. be able to.

The absorption coefficient of the photopolymerization initiator can be measured by a general 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 at a wavelength of 405 nm of 100 ml / (g · cm) or more, or 150 ml / (g · cm) or more. When the absorption coefficient is 100 ml / (g · cm) or more, the obtained primer layer is arranged on the side opposite to the exposed side of the phosphor layer when the phosphor layer is cured by single-sided exposure. However, since visible light having 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, anthraquinones and the like. From 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 photopolymerization initiator may be sensitive to ultraviolet rays. Among these, it is preferable to use acylphosphine oxides from the viewpoint of obtaining the effect of the present invention more sufficiently.

The content of the photopolymerization initiator in the primer layer forming composition is preferably 0.1 to 5% by mass based on the total solid content (nonvolatile content) of the primer layer forming composition, and is 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 value, the action of promoting the photopolymerization reaction by the photopolymerization initiator is sufficiently obtained, and the formed primer layer can obtain better adhesion to the phosphor layer and at a high temperature. It is possible to maintain better adhesion even when it is left in a high humidity environment for a long time, and when the phosphor layer is cured by single-sided exposure, it is on the side opposite to the exposed side of the phosphor layer. Even if it is arranged, better adhesion can be obtained. On the other hand, when the content is not more than the above upper limit value, it is possible to suppress the 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 being lowered.

(Other ingredients)
The composition for forming the primer layer includes the above-mentioned resin having a reactive carbon-carbon double bond, a resin having a primary hydroxyl group without a reactive carbon-carbon double bond, a polyisocyanate compound, and photopolymerization initiation. It may contain other components (additives) other than the agent. Examples of the additive include a slip agent, a surfactant, a solvent, an antifoaming agent, an antistatic agent and the like. As the solvent, for example, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, ethyl acetate, butyl acetate, methanol, ethanol, isopropyl alcohol, butanol and the like can be used. Further, the composition for forming a primer layer contains a photopolymerization initiator having a maximum absorption coefficient of less than 100 ml / (g · cm) in the visible light region having a wavelength of 400 to 700 nm and having sensitivity to ultraviolet rays. You may.

In order to accelerate the thermosetting of the primer layer, a thermosetting catalyst that promotes urethanization may be added to the composition for forming the primer layer. 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 by using the primer layer forming composition arranged 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 an embodiment of the barrier film of the present invention. The barrier film 100 shown in FIG. 1 includes a first film 1, a second film 2, an adhesive layer 4, a primer layer 5, and a mat layer 6, which are gas barrier films. Here, the first film 1 includes a first base material 11, an anchor coat layer 12, and a barrier layer 15 composed of an inorganic thin film layer 13 and a gas barrier coating layer 14. The second film 2 is composed of only the second base material 21. The first film 1 and the second film 2 are bonded to each other via an 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 arranged on the surface of the first film 1 on the side of the first base material 11 in contact with the first base material 11, and the mat layer 6 is the first. The second base material 21 constituting the film 2 of 2 is arranged on the surface opposite to the adhesive layer 4 in a state of being in contact with the second base material 21. The barrier film 100 having the structure shown in FIG. 1 includes the second film 2 to improve the gas barrier property and the mechanical strength, and the second film 2 is composed of only the second base material 21. Therefore, as compared with the barrier films of FIGS. 1 and 2 described later, the manufacturing process can be simplified, the cost can be reduced, and the thickness can be reduced.

The barrier film 200 shown in FIG. 2 includes a first film 1 which is a gas barrier film, a primer layer 5, and a mat layer 6. Here, the first film 1 includes a first base material 11, an anchor coat layer 12, and a barrier layer 15 composed of an inorganic thin film layer 13 and a gas barrier coating layer 14. In the barrier film 200, the primer layer 5 is arranged on the surface of the first film 1 on the gas barrier coating layer 14 side in a state of being in contact with the first base material 11, and the mat layer 6 is a second. The film 2 is arranged in contact with the second base material 21 on the surface of the second base material 21 opposite to the adhesive layer 4. Since the barrier film 200 having the structure shown in FIG. 2 does not include the second film 2 and the adhesive layer 4, the manufacturing process can be simplified, the cost can be reduced, and the thickness can be reduced.

The barrier film 300 shown in FIG. 3 includes a first film 1 which is a gas barrier film, a second film 2 which is a gas barrier film, an adhesive layer 4, a primer layer 5, and a mat layer 6. Here, the first film 1 includes a first base material 11, an anchor coat layer 12, and a barrier layer 15 composed 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 composed 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 to each other via an 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 arranged on the surface of the first film 1 on the side of the first base material 11 in contact with the first base material 11, and the mat layer 6 is the first. The film 2 is arranged on the surface of the film 2 on the side of the second base material 21 in contact with the second base material 21. Since the barrier film 300 having the structure shown in FIG. 3 has two gas barrier films of the first and second films 1 and 2 bonded together, the permeation of water and oxygen can be more sufficiently suppressed. .. Further, by arranging the barrier layers 15 and 25 inside the first and second base materials 11 and 21, the barrier layers 15 and 25 are protected and damage to the barrier layers 15 and 25 is suppressed.

The barrier film 400 shown in FIG. 4 includes a first film 1 which is a gas barrier film, a second film 2 which is a gas barrier film, an adhesive layer 4, a primer layer 5, and a mat layer 6. Here, the first film 1 includes a first base material 11, an anchor coat layer 12, and a barrier layer 15 composed 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 composed 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 to each other via an 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 arranged on the surface of the first film 1 on the gas barrier coating layer 14 side in a state of being in contact with the gas barrier coating layer 14, and the mat layer 6 is a second. The film 2 is arranged on the surface of the film 2 on the side of the second base material 21 in contact with the second base material 21. Since the barrier film 400 having the structure shown in FIG. 4 has two gas barrier films of the first and second films 1 and 2 bonded together, the permeation of water and oxygen can be more sufficiently suppressed. .. Further, by arranging the barrier layer 15 on the primer layer 5 side, that is, at a position closer to the phosphor layer, it is possible to more sufficiently suppress the invasion of water and oxygen into the phosphor layer.

The barrier films 100, 200, 300, and 400 having the above-described configuration have good gas barrier properties, and by bonding to the phosphor layer via the primer layer 5, excellent adhesion can be obtained. Further, the primer layer 5 is formed by 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 is a barrier. The occurrence of peeling in the film is also sufficiently suppressed. Therefore, the barrier film having the above-mentioned structure can suppress the invasion of oxygen and water vapor from the interface between the barrier film and the phosphor layer, and can suppress the deterioration of the phosphor layer.

Hereinafter, each layer constituting the barrier film will be described in detail.

(Base material)
It is desirable that the first and second base materials 11, 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; polycarbonates; and triacetyl cellulose. 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, and even more preferably a polyethylene terephthalate film. Polyethylene terephthalate film is desirable from the viewpoint of transparency, processing suitability and adhesion. Further, the polyethylene terephthalate film is preferably a biaxially stretched polyethylene terephthalate film from the viewpoint of transparency and gas barrier property.

The polymer film may contain additives such as an antistatic agent, an ultraviolet absorber, a plasticizer and a slip agent, if necessary. Further, the surface of the polymer film may be subjected to corona treatment, frame treatment and plasma treatment.

In the barrier film, when the first base material 11 and the primer layer 5 are in contact with each other, it is preferable that the first base material 11 has a polar group such as a hydroxyl group on its surface. When the first base material 11 has a polar group such as a hydroxyl group on its surface, the adhesion is further improved by the intermolecular force between the polar group such as the hydroxyl group and the functional group in the primer layer 5. Among the above-mentioned polymer films, those having a hydroxyl group on the surface usually 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, frame treatment and plasma treatment, the adhesion to the primer layer 5 can be further improved.

The thicknesses of the first and second base materials 11 and 21 are not particularly limited, but are preferably 3 μm or more and 100 μm or less, and more preferably 5 μm or more and 50 μm or less. When this 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 in order to improve the adhesion between the inorganic thin film layers 13 and 23. Further, the anchor coat layers 12 and 22 may have a barrier property to prevent the permeation of water and oxygen.

The anchor coat layers 12 and 22 are, 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, and 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 by using the above-mentioned resin alone or by using a composite resin in which two or more kinds of the above-mentioned resins are combined.

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

The thickness of the anchor coat layers 12 and 22 is preferably in the range of 5 to 500 nm, and more preferably in 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 and 21 and the inorganic thin film layers 13 and 23 and the barrier property against moisture and oxygen tend to be improved. When it is 500 nm or less, it tends to be possible to form a uniform layer in which the internal stress is sufficiently suppressed.

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

The barrier layers 15 and 25 may be formed in the air or in a vacuum. Examples of the vacuum film formation include a physical vapor deposition method and a chemical vapor deposition method. Examples of the physical vapor deposition method include a vacuum deposition 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, an optical CVD method, and the like. 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 vapor deposition method, a sputtering method, or a PECVD method. The vacuum vapor deposition method is more preferably a resistance heating vacuum deposition method, an electron beam heating vacuum deposition method, or an induction heating vacuum vapor deposition 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, the sputtering method is preferable, and from the viewpoint of cost, the vacuum vapor deposition method is preferable and can be selected according to the purpose and application.

Examples of the plasma generation method in the sputtering method and the PECVD method include a DC (Direct Current) method, an RF (Radio Frequency) method, an MF (Middle Frequency) method, a DC pulse method, an RF pulse method, and a DC + RF superimposition method. Can be done.

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

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, a better barrier property tends to be obtained. Further, when the thickness of the inorganic thin film layers 13 and 23 is 100 nm or less, the occurrence of cracks tends to be suppressed, and the deterioration of the water vapor barrier property and the oxygen barrier property due to the cracks tends to be suppressed. Further, when the thickness of the inorganic thin film layers 13 and 23 is 100 nm or less, the cost can be reduced due to the reduction of the amount of material used and the shortening of the film formation time, which is preferable from the economical viewpoint.

(Gas barrier coating layer)
The gas barrier coating layers 14 and 24 are provided to prevent various secondary damages in the subsequent process and to impart high barrier properties. The gas barrier coating layers 14 and 24 may contain a siloxane bond. The gas barrier coating layers 14 and 24 can also be formed in the atmosphere. When the gas barrier coating layers 14 and 24 are formed in the atmosphere, they contain, for example, polar compounds such as polyvinyl alcohol, polyvinylpyrrolidone and ethylene vinyl alcohol, chlorine-containing compounds such as polyvinylidene chloride, and 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, or the like onto the inorganic thin film layers 13 and 23, and drying and curing the mixture.

Specific examples of the coating liquid coating method for forming the gas barrier coating layers 14 and 24 in the atmosphere include a coating method using a gravure coater, a dip coater, a reverse coater, a wire bar coater, a die coater, and the like. Be done.

The compound containing a siloxane bond is preferably formed by reacting a silanol group with, for example, a silane compound. Examples of such a silane compound include a compound 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. And so on. Polysilazane containing nitrogen may be used.

Further, for the gas barrier coating layers 14 and 24, a material made of a precursor composed of other metal atoms may be used. 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, tetrabutoxytitanium and the like.

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 the gas barrier coating layers 14 and 24 are formed in the air, the coating liquid is cured after coating. The curing method is not particularly limited, and examples thereof include ultraviolet curing and thermosetting. In the case of UV curing, the coating solution may contain a polymerization initiator and a compound having a double bond. If necessary, heat aging may be performed.

As another method for forming the gas barrier coating layers 14 and 24 in the atmosphere, particles of inorganic oxides such as magnesium, calcium, zinc, aluminum, silicon, titanium, and zirconium are interposed via phosphorus atoms derived from a phosphorus compound. It is also possible to use a method in which the reaction product obtained by dehydration condensation is used as a gas barrier coating layer. Specifically, a functional group (for example, a hydroxyl group) existing on the surface of the inorganic oxide and a site of a phosphorus compound capable of reacting with the inorganic oxide (for example, a halogen atom directly bonded to a phosphorus atom or directly to a phosphorus atom). The bonded oxygen atom) causes a condensation reaction and is bonded. In the reaction product, for example, a coating liquid containing an inorganic oxide and a phosphorus compound is applied to the surfaces of the inorganic thin film layers 13 and 23, and the formed coating film is heat-treated so that the particles of the inorganic oxide are made into phosphorus. It is obtained by advancing the reaction of binding via a phosphorus atom derived from a compound. 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. If 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 the base material and the like, but is 220 ° C. or lower, and preferably 190 ° C. or lower. The heat treatment can be carried out in air, in a nitrogen atmosphere, in an argon atmosphere, or the like.

When the gas barrier coating layers 14 and 24 are formed 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 and polyester resin. Among these resins, the coating liquid preferably contains a resin having high compatibility with other materials in the coating liquid.

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

The thickness of the gas barrier coating layers 14 and 24 formed in the atmosphere is preferably 50 nm to 2000 nm, more preferably 100 nm to 1000 nm in terms of the film thickness 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 easy. 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 formed with the first film 1 and the second film 2 in order to bond and laminate the first film 1 and the second film 2. It is provided between. As the adhesive layer 4, a general adhesive or an adhesive for a polymer film can be used, and the adhesive layer 4 is appropriately selected according to the surfaces of the first film 1 and the second film 2 on the side to be bonded. Will be done. Examples of the material of the adhesive layer 4 include epoxy-based, polyester-based, acrylic-based, rubber-based, phenol-based, and urethane-based adhesives or adhesives.

Examples of the adhesive or the method of applying the adhesive include a gravure coater, a dip coater, a reverse coater, a wire bar coater, a 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 the cost increase tends to be suppressed. is there.

In addition, the first film 1 and the second film 2 can be bonded to each other via the adhesive layer 4 and then aged. 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, if 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 primer layer forming composition. The primer layer 5 can be formed by applying a primer layer forming composition on the first base material 11 of the first film 1 or on the gas barrier coating layer 14 and curing the composition. Examples of the coating method include a gravure coater, a dip coater, a reverse coater, a wire bar coater, a 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 sufficiently, the 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, further preferably 0.3 to 3 μm, and 0.5 to 1.5 μm. Is particularly preferable. When this thickness is 0.1 μm or more, the occurrence of pinholes can be suppressed, and since the film has a sufficient film thickness, stress relaxation property can be sufficiently exhibited, and the film forming property after coating is stable, and the surface surface is stable. Good adhesion can be uniformly obtained within. On the other hand, when the thickness is 10 μm or less, the primer layer 5 can be prevented from becoming brittle and stable adhesion to the phosphor layer can be obtained, and the end portion of the primer layer 5 (barrier film and phosphor layer) can be obtained. It is possible to sufficiently suppress the invasion of water and oxygen through the primer layer from between), and it is possible to suppress deterioration of the light emitting characteristics of the phosphor layer (particularly edge deterioration). Further, when the thickness of the primer layer 5 is thin, the curing reaction of the primer layer 5 proceeds faster and the initial adhesion to the phosphor layer becomes better.

(Mat layer)
The mat layer 6 is provided on the surface of the barrier film opposite to the primer layer 5 in order to exert one or more optical functions and antistatic functions. Here, the optical function is not particularly limited, and examples thereof include an interference fringe (moire) prevention function, an antireflection function, and a diffusion function. Among these, the mat layer 6 preferably has at least an interference fringe prevention function as an optical function. In this embodiment, a case where the mat layer 6 has at least an interference fringe prevention function will be described.

The mat layer 6 may be composed of a binder resin and fine particles. Then, the surface of the mat layer 6 may have fine irregularities by embedding the fine particles in the binder resin so that a part of the fine particles is exposed from the surface of the mat layer 6. By providing such a mat layer 6 on the surface of the barrier film, the occurrence of interference fringes such as Newton rings can be more sufficiently prevented, and as a result, a wavelength conversion sheet having high efficiency, high definition, and long life can be obtained. It becomes possible.

The binder resin is not particularly limited, but a resin having 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. In addition to the organic resin, a silica binder can also be used. Among these, it is desirable to use an acrylic resin or a urethane resin because of the wide range of materials, and it is more desirable to use an acrylic resin because of its excellent light resistance and optical characteristics. These are not limited to one type, but can be used in combination of a plurality of types.

The fine particles are not particularly limited, but are, for example, 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, and silicone resin. Organic fine particles such as acrylic resin and polyamide resin can be used. Among these, as the fine particles, it is preferable to use fine particles having a refractive index of 1.40 to 1.55 made of silica, acrylic resin, urethane resin, polyamide resin or the like in terms of light transmittance. Fine particles with a low refractive index are expensive, while fine particles with an excessively high refractive index tend to impair the light transmittance. These are not limited to one type, but can be used in combination of a plurality of types.

The average particle size of the fine particles is preferably 0.1 to 30 μm, more preferably 0.5 to 10 μm. When the average particle size 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, the transparency tends to be further improved.

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

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

The thickness of the mat layer 6 is preferably 0.1 to 20 μm, more preferably 0.3 to 10 μm. When the thickness of the mat layer 6 is 0.1 μm or more, a uniform film tends to be easily obtained, and an optical function tends to be sufficiently obtained. On the other hand, when the thickness of the mat layer 6 is 20 μm or less, when fine particles are used for the mat layer 6, the fine particles are exposed on the surface of the mat layer 6 and the unevenness imparting effect tends to be easily obtained.

The barrier film of the present embodiment having the above-described configuration can be used in applications that require barrier properties regarding the permeation of oxygen and water vapor. For example, a wavelength conversion sheet containing a light emitter used for a liquid crystal backlight. In particular, it can be used as a barrier film for a wavelength conversion sheet containing a quantum dot illuminant.

[Wavelength conversion sheet]
Next, the wavelength conversion sheet of the present invention using the barrier film will be described. 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 of the phosphor layer. A second barrier film laminated on the surface of the above is provided, and at least the first barrier film is the barrier film of the present invention having the primer layer on the outermost surface on the phosphor layer side. ..

FIG. 5 is a schematic cross-sectional view showing an 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 having a wavelength conversion function including a phosphor 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 film 100 described above. The first and second barrier films 100a and 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, since the first and second barrier films 100a and 100b and the phosphor layer 7 are bonded to each other via the primer layer 5, excellent adhesion can be obtained. The first and second barrier films 100a and 100b may be the barrier film 200, the barrier film 300, or the barrier film 400 described above.

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

Among the phosphors, nano-sized semiconductors called quantum dots are preferable because they can obtain high wavelength conversion efficiency and are excellent in brightness and color reproducibility as a display. Examples of the quantum dots include those in which the core as a light emitting portion is covered with a shell as a protective film. Examples of the core include cadmium selenide (CdSe) and the like, and examples of the shell include zinc sulfide (ZnS) and the like. The quantum efficiency is improved by covering the surface defects of the CdSe particles with ZnS having a large bandgap. 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 laminated.

The phosphor is dispersed in a sealing resin for sealing. The sealing resin can be formed by using, for example, a curable resin such as a light (UV) curable resin having an ethylenic double bond and an epoxy-based photocationic polymerizable resin.

The phosphor layer 7 is a primer layer 5 of one of the first and second barrier films 100a and 100b containing a mixed solution containing a phosphor, a curable resin, a curing agent if necessary, and a solvent if necessary. It is applied on top to form a coating film, and the other of the first and second barrier films 100a and 100b is laminated so that the primer layer 5 faces the phosphor layer 7, and the coating film is cured. can do.

The coating film can be cured by curing the photocurable resin (UV curing) by irradiating with ultraviolet rays. The photocurable resin may be further thermoset after UV curing. By curing the curable resin, the sealing resin for the phosphor layer 7 is formed.

The wavelength conversion sheet of the present 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 reflector, and a wavelength conversion sheet of the present embodiment. In the backlight unit, the light guide plate and the reflector are arranged in this order on one surface of the wavelength conversion sheet, and the light source is arranged on the side of the light guide plate (the surface direction of the light guide plate). As the light source, for example, a blue light emitting diode element or the like is used.

[Manufacturing method of barrier film and wavelength conversion sheet]
Next, an embodiment of the method for manufacturing the barrier film and the 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 including a gas barrier film and a primer layer arranged on one of the outermost surfaces, and is a composition for forming the primer layer on the gas barrier film. It has a step of applying an object and curing it to form the primer layer.

Further, the method for producing a wavelength conversion sheet of the present embodiment is a barrier film laminated on both a phosphor layer containing a cured product (sealing resin) of a phosphor and a curable resin and the surface of the phosphor layer. A method for producing a wavelength conversion sheet comprising the above, 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. By irradiating the step of forming the laminate and light including ultraviolet rays and visible light having a wavelength of 400 to 700 nm from the second barrier film side of the laminate, the curable resin in the coating film is cured. It has a step of forming a phosphor layer. Here, at least the first barrier film is the barrier film of the present embodiment having the primer layer on the outermost surface on the coating film side. The second barrier film may also be the barrier film of the present embodiment described above. The first and second barrier films may be any of the above-mentioned barrier films 100, 200, 300, and 400, respectively.

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

An adhesive or an adhesive is applied onto the gas barrier coating layer 14 of the obtained first film 1, and the film 1 and the second film are aged by being bonded to the second film 2 and aged. A laminated film is obtained in which 2 and 2 are bonded to each other via an adhesive layer 4. The bonding can be performed using a general laminating device. The adhesive or the adhesive may be applied on the second film 2.

The above-mentioned composition for forming a primer layer of the present embodiment is applied onto the first base material 11 of the obtained laminated film and cured to form the primer layer 5. Further, the matte layer 6 is formed on the second film 2 of the laminated film. The formation order of the primer layer 5 and the mat layer 6 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. Further, the primer layer 5 may be formed on the first base material 11 of the first film 1 in advance before the first film 1 and the second film 2 are bonded together. As a result, the barrier film 100 is obtained. Two of these barrier films 100 are produced and used as a first barrier film 100a and a second barrier film 100b, respectively.

Next, a mixed solution containing a phosphor, a curable resin, a curing agent if necessary, and a solvent if necessary is applied onto the primer layer 5 of the first barrier film 100a to form a coating film. The primer layer 5 side of the second barrier film 100b is bonded onto the primer layer 5 side to obtain a laminated body. Next, the curable resin in the coating film was cured by irradiating light containing ultraviolet rays and visible light having a wavelength of 400 to 700 nm from the second barrier film 100b side of the obtained laminate to cure the phosphor layer 7 To form. At this time, since the light to be irradiated contains ultraviolet rays and visible light having a wavelength of 400 to 700 nm, the curable resin in the coating film is cured by the ultraviolet rays, and the visible light transmitted through the coating film is the first barrier film 100a. When it reaches the primer layer 5, the reaction between the resin having a reactive carbon-carbon double bond in the primer layer 5 and the curable resin in the coating film proceeds due to the action of the photopolymerization initiator, and excellent adhesion is achieved. Is obtained. In the primer layer 5 of the second barrier film 100b, the reaction between the resin having a reactive carbon-carbon double bond in the primer layer 5 and the curable resin in the coating film proceeds by the visible light directly irradiated. Therefore, excellent adhesion can be obtained. When the photopolymerization initiator contained in the primer layer 5 of the second barrier film 100b is also sensitive to ultraviolet rays, the above reaction proceeds even with the directly irradiated ultraviolet rays. By the above method, it is possible to obtain the wavelength conversion sheet 600 of the present embodiment having good gas barrier properties and excellent adhesion between the first and second barrier films 100a and 100b and the phosphor layer 7.

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

In the coating film, the minimum value of visible light transmittance at a wavelength of 400 to 700 nm is preferably 30% or more, preferably 35% or more, in the coating film thickness corresponding to the thickness of the phosphor layer 7 to be formed. More preferably, it is more preferably 50% or more, and particularly preferably 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.

In the coating film, the visible light transmittance at a wavelength of 405 nm is preferably 30% or more, more preferably 35% or more, in the coating film thickness corresponding to the thickness of the phosphor layer 7 to be formed. It is more preferably 50% or more, and particularly preferably 70% or more. The larger the visible light transmittance at the wavelength of 405 nm, the easier it is for visible light having a wavelength of 405 nm 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. it can.

In the coating film, the maximum value of the ultraviolet transmittance at a wavelength of 200 to 380 nm may be less than 30%, and is 25% or less in the coating film thickness corresponding to the thickness of the phosphor layer 7 to be formed. It may be 20% or less. Even when the ultraviolet transmittance of the coating film is low as described above, if the primer layer is formed by using the primer layer forming composition of the present embodiment, the reaction proceeds by visible light, so that the primer layer And excellent adhesion to the phosphor layer can be obtained.

In the present specification, the visible light transmittance and the ultraviolet transmittance of the coating film mean values measured by the following methods. 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 attached thereto to form a test piece. To make. The thickness of the coating film is a coating film thickness corresponding to the thickness of the phosphor layer 7 to be formed. On the other hand, two polypropylene films are bonded together without sandwiching the coating film to prepare a control test piece. The light transmittance of the obtained test piece and the control test piece at a wavelength of 200 to 700 nm is measured using an ultraviolet-visible spectrophotometer, and the light transmittance of the coating film of each wavelength is calculated from the result by the following formula. Thereby, the minimum value of the visible light transmittance at the wavelength of 400 to 700 nm, the visible light transmittance at the wavelength of 405 nm, and the maximum value of the ultraviolet light transmittance at the wavelength of 200 to 380 nm can be obtained.
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 modifications can be made without departing from the spirit of the present invention. 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, the gas barrier property can be further enhanced.

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 in the drawings, and may be arranged in opposite directions.

The barrier film may further include one or more films having a structure similar to those of the first film and the second film. For example, in the barrier films 300 and 400 shown in FIGS. 3 and 4, a third film made of only 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 the adhesive layer 4 may not be provided. In the barrier film shown in FIG. 2, the barrier film is composed of only the second base material 21 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 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 from each other. Further, the mat layer 6 does not necessarily have to be provided on both sides of the wavelength conversion sheet, and may be provided only on one surface.

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 of 400 to 700 nm.

[Example 1]
(Preparation of composition for forming primer layer)
Acryloyl group-containing resin (manufactured by Arakawa Chemical Industry Co., Ltd., model number: ACS-719, resin having acryloyl group and secondary hydroxyl group, (meth) acrylic equivalent 214 g / eq, which is a resin having a reactive carbon-carbon double bond. Hydroxyloyl value 262 mgKOH / g) 50 parts by mass and acrylic polyol (manufactured by Arakawa Chemical Industry Co., Ltd., model number: ACS-717, hydroxyl value) which is a resin having a primary hydroxyl group without a reactive carbon-carbon double bond. To 50 parts by mass of 80 mgKOH / g), 1000 parts by mass of a solvent (ethyl acetate) was added, and the mixture was stirred at 25 ° C. for 2 hours. Then, 15 parts by mass of burette-type hexamethylene diisocyanate (manufactured by Arakawa Chemical Industries, Ltd., trade name: Alacoat CL106) and 2 parts by mass of photopolymerization initiator A were added as a curing agent, 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, the photopolymerization initiator and the solvent in the primer layer forming composition 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 methods. The (meth) acrylic equivalent was calculated from the (meth) acrylic equivalent of the resin having a reactive carbon-carbon double bond and the blending ratio thereof. The hydroxyl value is calculated from the hydroxyl value of a resin having a reactive carbon-carbon double bond, the hydroxyl value of a resin having a primary hydroxyl group without a reactive carbon-carbon double bond, and the blending ratio thereof. It was. The NCO / OH ratio of the primer layer forming composition was 0.48.

(Making a barrier film)
A polyester resin solution was applied by the bar coat method on the corona discharge-treated surface of a biaxially stretched polyethylene terephthalate film (trade name: P60, thickness: 16 μm, manufactured by Toray Industries, Inc.) whose one side was corona discharge-treated. An anchor coat layer having a thickness of 100 nm was formed by drying and curing at 80 ° C. for 1 minute.

Using a vacuum vapor deposition apparatus of the electron beam heating type, a silicon oxide material (manufactured by Canon Optron Inc.) and evaporated by electron beam heating under a pressure of 1.5 × 10 -2 ^Pa, an inorganic thin film on the anchor coat layer A SiOx film having a thickness of 80 nm was formed as a layer. The accelerating voltage in the vapor deposition was 40 kV, and the emission current was 0.2 A. On this SiOx film, a coating solution prepared by mixing a hydrolyzate of tetraethoxysilane (containing a siloxane bond) and polyvinyl alcohol at a mass ratio of 1: 1 is applied by 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. As a result, a first film was obtained. The water vapor permeability of the first film was 0.5 g / (m ² · day).

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

The composition for forming a primer layer is coated on the polyethylene terephthalate film (first base material) of the first film in the obtained laminated film (1) with a wire bar coater to form a coating film, and a batch is formed. A primer layer was formed by drying and curing at 100 ° C. for 20 seconds in an oven and then 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, trade name: Acrydic A-814) and an isocyanate-based curing agent (manufactured by DIC). , Trade name: Vernock DN-980, hexamethylene diisocyanate compound) 8.5 parts by mass, fine particles (polyurethane, average particle size 2 μm) 10 parts by mass, solvent (ethyl acetate) 70 parts by mass, composition for forming a mat layer Was applied, dried by heating, and cured to form a matte layer having a thickness of 3 μm. As a result, a barrier film having the structure shown in FIG. 1 was obtained. Two of these barrier films 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 has cadmium selenide (CdSe), the shell has zinc sulfide (ZnS), a quantum dot illuminant having a particle size of 6 nm, and an acryloyl group at the end of the main chain or side chain. A composition for forming a phosphor layer containing an acrylic photocurable resin (manufactured by Hitachi Kasei Co., Ltd., trade name: Hitaroid 7927-8) and a photopolymerization initiator (manufactured by BASF, trade name: Lucirin TPO). It was applied to form a coating film, and a primer layer of a second barrier film was attached thereto. The thus obtained laminate, ultraviolet irradiation apparatus from the second barrier film side: irradiating light at an exposure dose of ^{300mJ / cm 2, 600mJ / cm} 2 or 600 mJ / cm ² using (light source a high pressure mercury lamp) As a result, the coating film was cured to form a phosphor layer (thickness 100 μm) having a wavelength conversion function. The spectrum of light used for exposure is shown in FIG. As shown in FIG. 6, the light used for exposure includes visible light and ultraviolet light.

In addition, the visible light transmittance of the coating film was measured by the following method. 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 bonded thereto to prepare a test piece. did. The thickness of the coating film was the same as that at the time of producing the wavelength conversion sheet (the thickness of the coating film on which the phosphor layer having a thickness of 100 μm was formed). In addition, two polypropylene films were laminated without sandwiching the coating film to prepare a control test piece. The light transmittance of the obtained test piece and the control test piece at a wavelength of 200 to 700 nm was measured using a JASCO V-650 spectrometer (manufactured by JASCO Corporation). The graph of the obtained light transmittance is shown in FIG. From this measurement result, the light transmittance of the coating film of each wavelength was calculated by the following formula, and the minimum value of the light transmittance in the visible light region having a wavelength of 400 to 700 nm was obtained. As a result, the minimum value of visible light transmittance was 35%. The maximum value of the ultraviolet transmittance at a wavelength 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 primer layer forming composition, a barrier film, and a wavelength conversion sheet were obtained in the same manner as in Example 1 except that the photopolymerization initiator B was used instead of the photopolymerization initiator A.

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

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

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

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

1 ... 1st film, 2 ... 2nd film, 4 ... adhesive layer, 5 ... primer layer, 6 ... matte layer, 7 ... phosphor 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.
A resin having a reactive carbon-carbon double bond, a resin having a primary hydroxyl group without a reactive carbon-carbon double bond, a polyisocyanate compound, and a maximum absorption coefficient in the visible light region having a wavelength of 400 to 700 nm. A composition for forming a primer layer, which comprises a photopolymerization initiator having a concentration of 100 ml / (g · cm) or more. The primer layer forming composition 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 primer layer forming composition. The composition for forming a primer layer according to claim 1 or 2, wherein the NCO / OH ratio is 0.1 to 0.6. The primer layer forming composition according to any one of claims 1 to 3, wherein the (meth) acrylic equivalent of the entire resin component contained in the primer layer forming composition 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 and
A primer layer composed of a cured product formed by using the primer layer forming composition according to any one of claims 1 to 5, which is arranged on one of the outermost surfaces.
Barrier film with. 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 laminated on the other surface of the phosphor layer. With 2 barrier films
The wavelength conversion sheet according to claim 6, wherein the first barrier film is provided with the primer layer on the outermost surface on the phosphor layer side. A step of forming a laminate containing 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 to form a phosphor layer by irradiating the laminated body with light containing ultraviolet rays and visible light having a wavelength of 400 to 700 nm from the second barrier film side. And have
The method for producing a wavelength conversion sheet, wherein the first barrier film is the barrier film according to claim 6, wherein the primer layer is provided on the outermost surface on the coating film side. The method for producing a wavelength conversion sheet according to claim 8, wherein the minimum value of the visible light transmittance at a wavelength of 400 to 700 nm of the coating film is 30% or more.

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