JP7085753B2 - Thermoplastic sheet with antireflection function, its manufacturing method, and image display device using it. - Google Patents

Description

The present invention relates to, for example, a thermoplastic sheet with an antireflection function used in an image display device such as a display, a touch panel, or a portable information terminal, a method for manufacturing the same, and an image display device using the same.

A resin protective plate is used to protect the surface of an image display device such as a display, a touch panel, or a portable information terminal. This protective plate is required to have various functions such as optical transparency and antireflection function in addition to resistance to heat generation from the inside of the display device, and also displays individual images such as a center information display, a meter panel, and a heat control panel. With the sophistication of design, the demand for functions of devices is increasing. This protective plate is manufactured by laminating a functional film on a transparent sheet from the viewpoint of productivity. Further, in recent years, in order to enhance the design of the image display device, a thermoplastic sheet capable of post-processing of heat molding and cutting has been used for this protective plate (for example, Patent Documents 1 and 2). ). In Patent Documents 1 and 2, specifically, a thermoplastic sheet having an antireflection function in which a film having an antireflection function is bonded to a polycarbonate plate having excellent transparency via an adhesive layer or a hot melt layer. Is described.

Japanese Unexamined Patent Publication No. 2011-189625 Japanese Unexamined Patent Publication No. 2005-227415

As image display device products require a higher degree of design, the level of demand for these thermoplastic sheets is also increasing. In the manufacture of thermoplastic sheets with anti-reflection function, when an adhesive is used for bonding, heat resistance such as deterioration of appearance due to gas generated by heat deteriorates, and the adhesive is used during cutting. The cutting resistance deteriorates, such as the problem of popping out and the accompanying peeling of the film. When an adhesive that generates less gas is used, the difference in refractive index between the adherend and the adhesive causes a decrease in transmittance.
There is a demand for a thermoplastic sheet having an antireflection function having good heat resistance and cutting resistance without impairing the design function of the antireflection film to be bonded.

Therefore, an object of the present invention is heat with an antireflection function, which has good optical characteristics such as an antireflection function, can maintain a good appearance even after a high temperature load, and is less likely to peel off at the interface between the film and the sheet during cutting. It is an object of the present invention to provide a plastic sheet, a method for producing the same, and an image display device using the same.

As a result of diligent research to solve the above problems, the present inventors have made a thermoplastic transparent sheet having a specific thickness and a reflection having a specific thickness provided on at least one surface of the thermoplastic transparent sheet. In order to complete the present invention, we have found that the above problems can be solved by setting the residual amount of the volatile organic solvent in a specific range in a thermoplastic sheet with an antireflection function, which is a welded body to a preventive film. I arrived.
That is, the present invention is the following [1] to [6].

[1] A welded body of a thermoplastic transparent sheet having a thickness of 0.1 to 15 mm and an antireflection film having a thickness of 0.005 to 0.4 mm provided on at least one surface of the thermoplastic transparent sheet. , A thermoplastic sheet with an antireflection function in which the residual amount of the volatile organic solvent is 0.005 to 4.3% by mass.
[2] The method for producing a thermoplastic sheet with an antireflection function according to the above [1], which comprises the following steps (a) to (d).
Step (a): A thickness of 0.005 including a thermoplastic transparent sheet having a thickness of 0.1 to 15 mm, a thermoplastic transparent base film, and an antireflection layer provided on one surface of the thermoplastic transparent base film. Step of preparing an antireflection film of ~ 0.4 mm (b): Reflection of one surface of a thermoplastic transparent sheet having a thickness of 0.1 to 15 mm and / or an antireflection film having a thickness of 0.005 to 0.4 mm. Step of coating a surface without a preventive layer with a volatile organic solvent at a coating amount of 0.08 to 80 g / m ² (c): The heat with the volatile organic solvent remaining. A step step (d) of obtaining a crimp sheet by crimping the antireflection film and the thermoplastic transparent sheet so that one surface of the plastic transparent sheet and the surface of the antireflection film not provided with the antireflection layer are opposed to each other. ): Step of drying the crimping sheet obtained in the above step (c) [3] The step according to the above [2], wherein the drying temperature in the above step (d) is 20 to 100 ° C. A method for manufacturing a thermoplastic sheet with an antireflection function.
[4] The heat with antireflection function according to the above [2] or [3], wherein the residual amount of the volatile organic solvent in the step (c) is 0.04 to 40 g / m ² . A method for manufacturing a plastic sheet.
[5] The thermoplastic transparent sheet is a single-layer sheet made of any one of polymethylmethacrylate resin, methylmethacrylate-styrene copolymer resin and polycarbonate resin, a two-layer sheet of polymethylmethacrylate resin / polycarbonate resin, or polymethyl. It is a three-layer sheet of methacrylate resin / polycarbonate resin / polymethyl methacrylate resin.
The thermoplastic transparent base film is a single-layer film made of any one of acrylic resin, methyl methacrylate-styrene copolymer resin, ABS resin, and polycarbonate resin, a two-layer film of polymethylmethacrylate resin / polycarbonate resin, or poly. The method for producing a thermoplastic sheet with an antireflection function according to any one of [2] to [4] above, which is a three-layer film of a methyl methacrylate resin / a polycarbonate resin / a polymethyl methacrylate resin.
[6] An image display device comprising a heat-molded product of the thermoplastic sheet with an antireflection function according to the above [1] on the surface.

According to the present invention, while having the thermoplastic transparent sheet and the antireflection film on one surface of the thermoplastic transparent sheet, the optical performance such as the antireflection function is excellent, and the good appearance is high temperature at the time of molding or the like. Provided are a thermoplastic sheet with an antireflection function that is maintained even after a load and is less likely to peel off at the interface between the film and the sheet during cutting, and an image display device provided with the thermoplastic sheet on the surface.

Hereinafter, the present invention will be described in more detail.

The thermoplastic sheet with antireflection function of the present invention has a thermoplastic transparent sheet having a thickness of 0.1 to 15 mm and a thickness of 0.005 to 0.4 mm provided on at least one surface of the thermoplastic transparent sheet. It is a welded body with an antireflection film, and is a thermoplastic sheet with an antireflection function in which the residual amount of the volatile organic solvent is 0.005 to 4.3% by mass.
If the residual amount of the volatile organic solvent in the thermoplastic sheet is less than 0.005% by mass, it is likely to be peeled off at the interface between the thermoplastic transparent sheet and the antireflection film during cutting. If the residual amount of the volatile organic solvent exceeds 4.3% by mass, the appearance deteriorates after a high temperature load. The residual amount of the volatile organic solvent is preferably 0.01 to 4.2% by mass.
In the present invention, the volatile organic solvent means an organic solvent having a boiling point of 150 ° C. or lower at a standard pressure.
The residual amount of the volatile organic solvent in the thermoplastic sheet with antireflection function of the present invention refers to the number of grams of the solvent remaining per unit m ² of the sheet, which is quantified by the headspace gas chromatography method. The headspace gas chromatography method is a method in which a sample is enclosed in a container, heated, and the gas in the container is promptly injected into a gas chromatograph with the container filled with volatile components to quantify the volatile components.
The residual amount of the volatile organic solvent in the thermoplastic sheet can be adjusted by the production conditions when forming a welded body between the thermoplastic transparent sheet and the antireflection film.
Further, in the present invention, the "welded body" means a laminate formed by using a volatile organic solvent, for example, volatile organic on one surface of a thermoplastic transparent sheet and / or an antireflection film. A sheet and / or a film whose surface has been treated with a volatile organic solvent by contact with a solvent is obtained, and this treated surface is used to mean a laminate in which the sheet and the film are adhered.

[Thermoplastic transparent sheet]
The thickness of the thermoplastic transparent sheet used in the present invention is 0.1 to 15 mm. If the thickness is less than 0.1 mm, the sheet loses its elasticity and the shape stability is likely to be impaired. If the thickness exceeds 15 mm, the weight increases, so that the weight is reduced.
The thickness of the thermoplastic transparent sheet is preferably 0.1 to 5.0 mm, more preferably 0.4 to 2.0 mm.

The layer structure and material of the thermoplastic transparent sheet used in the present invention are not particularly limited, and may be a single-layer sheet made of a thermoplastic resin or a multi-layer sheet having two or more layers each layer made of a thermoplastic resin. good. Examples of the type of thermoplastic resin include polymethylmethacrylate resin, methylmethacrylate-styrene copolymer resin, polycarbonate resin and the like.
The thermoplastic transparent sheet is preferably a single-layer sheet composed of any one of polymethylmethacrylate resin, methylmethacrylate-styrene copolymer resin and polycarbonate resin; polymethylmethacrylate resin / polycarbonate resin two-layer sheet; polymethyl. Examples thereof include a three-layer sheet of methacrylate resin / polycarbonate resin / polymethylmethacrylate resin, and more preferably a single-layer sheet such as polymethylmethacrylate resin and polycarbonate resin, and polymethylmethacrylate resin / polycarbonate resin / polymethylmethacrylate. A three-layer sheet of resin can be mentioned. From the viewpoint of improving the heat resistance of the thermoplastic sheet with antireflection function of the present invention, a three-layer sheet of polymethylmethacrylate resin / polycarbonate resin / polymethylmethacrylate resin is particularly preferable.
In the present specification, when the layer structure is displayed as A / B, for example, it means that the layer structure is a two-layer structure in which the A layer and the B layer are laminated, and is indicated as A / B / A. If so, it means that the structure is a three-layer structure in which the A layer, the B layer, and the A layer are laminated in this order.

[Anti-reflective film]
The antireflection film of the present invention may be provided on one surface or both surfaces of the thermoplastic transparent sheet. Further, it is preferable that the antireflection film is provided directly on the surface of the thermoplastic transparent sheet. For example, if an adhesive layer or the like is present between the antireflection film and the thermoplastic transparent sheet, the heat resistance and machinability of the thermoplastic sheet with antireflection function of the present invention tend to deteriorate.
The antireflection film used in the present invention is a thermoplastic film provided with an antireflection layer, preferably a thermoplastic film including a thermoplastic transparent base film and an antireflection layer. In this case, the antireflection layer is provided directly on one surface of the thermoplastic transparent base film or via a hard coat layer or the like.
The thickness of the antireflection film is 0.005 to 0.4 mm. If the thickness is less than 0.005 mm, the thickness is too thin and the film is easily cut and difficult to handle. If the thickness is more than 0.4 mm, air easily enters between the thermoplastic transparent sheet and the antireflection film. , Problems in bonding are likely to occur.
The thickness of the antireflection film is preferably 0.025 to 0.25 mm, more preferably 0.050 to 0.100 mm. By adjusting the thickness within such a range, it becomes easy to maintain a good appearance of the thermoplastic sheet with antireflection function of the present invention after a high temperature load.

The layer structure and material of the thermoplastic transparent base film used in the present invention are not particularly limited, and even if it is a single-layer film made of a thermoplastic resin, each layer is a multilayer film having two or more layers made of a thermoplastic resin. You may. Examples of the type of thermoplastic resin include acrylic resins such as polymethylmethacrylate resin, methylmethacrylate-styrene copolymer resin, ABS resin, and polycarbonate resin.
The thermoplastic transparent base film is preferably a single-layer film in which the thermoplastic transparent base film is made of any one of an acrylic resin, a methyl methacrylate-styrene copolymer resin, an ABS resin, and a polycarbonate resin; a polymethyl methacrylate resin. / Polycarbonate resin two-layer film; Polymethylmethacrylate resin / Polycarbonate resin / Polymethylmethacrylate resin three-layer film, and among these, polymethylmethacrylate resin single-layer film and polymethylmethacrylate resin / Polycarbonate resin are preferable. The two-layer film of is mentioned.

The thermoplastic sheet with an antireflection function of the present invention is preferably formed by arranging the surface of the antireflection film on the thermoplastic transparent base film side so as to be in contact with the surface of the thermoplastic transparent sheet. In this case, the thermoplastic transparent sheet and the thermoplastic transparent base film are in contact with each other, but it is preferable that the layers of the same material are in contact with each other. In other words, the two layers in direct contact are preferably made of the same material. For example, if the thermoplastic transparent base film (or the layer on the thermoplastic transparent sheet side of the thermoplastic transparent base film) is made of a polymethylmethacrylate resin, the thermoplastic transparent sheet (or the thermoplastic transparent sheet) is formed. Of these, the layer on the thermoplastic transparent base film side) is also preferably a polymethylmethacrylate resin.
Since the two layers in direct contact are made of the same material, the adhesiveness at the interface is enhanced, and the heat resistance and the adhesive processing resistance are easily improved. In particular, it is preferable that the two layers in direct contact are both polymethylmethacrylate resins.

The antireflection film used in the present invention includes an antireflection layer. As the antireflection layer, one formed directly on the above-mentioned thermoplastic transparent base film or via a hard coat layer or an antiglare hard coat layer can be used. For example, a method of JP-A-2007-171405 which is formed on a hard coat layer using a polydiorganosiloxane compound, and a method of forming on an antiglare layer containing translucent organic fine particles instead of the hard coat layer can be mentioned. Be done.
[Hard coat layer]
As the composition for forming the hard coat layer for forming the hard coat layer, a conventionally known composition capable of forming the hard coat layer can be used, but it contains a photocurable resin and a photopolymerization initiator. It is preferably a composition for forming a hard coat. When the composition for forming a hard coat layer has a basic composition consisting of a photocurable resin and a photopolymerization initiator, it is photocurable with respect to a total of 100 parts by mass of the photocurable resin and the photopolymerization initiator. The resin may be 90 to 99 parts by mass, and the photopolymerization initiator may be 1 to 10 parts by mass. Further, as will be described later, the composition for forming a hard coat may contain translucent organic fine particles to prepare a composition for forming an antiglare hard coat layer.
As the photocurable resin used for the hard coat layer, a polyfunctional acrylate is preferably used, and among them, a 2-3 functional polyfunctional acrylate is more preferably used. If the functional number of the polyfunctional acrylate is within this range, defects such as cracks after the heat resistance test occur due to an increase in the difference between the expansion of the resin plate and the base film resin underneath and the shrinkage of the hard coat layer cured film. Good appearance is obtained.
When a polyfunctional acrylate having four or more functional numbers is used in combination, an acrylic resin having a glass transition temperature Tg of 84 ° C. or higher (for example, PMMA (Tg is about 105 ° C.)) is blended together after the heat resistance test. The occurrence of cracks can be suppressed.
On the other hand, when the content of the monofunctional acrylate is limited to 20% by mass or less, the coating film is not peeled off or embrittled, and the long-term durability in a high temperature and high humidity environment is not impaired.

Examples of the photocurable resin include oligomers such as urethane (meth) acrylate, epoxy (meth) acrylate, polyester (meth) acrylate, polyether (meth) acrylate, and (meth) acrylate.

The photopolymerization initiator is used as a polymerization initiator when the composition for forming a hard coat layer is cured by ultraviolet rays (UV) to form a coating film. The photopolymerization initiator is not particularly limited as long as it initiates polymerization by irradiation with ultraviolet rays, and known compounds can be used. For example, 1-hydroxycyclohexylphenylketone, 2-hydroxy-2-methyl-1-phenylpropane-1-one, 2-methyl-1- [4- (methylthio) phenyl] -2-morpherinopropane-1. -On, 1- [4- (2-hydroxyethoxy) phenyl] -2-hydroxy-2-methyl-1-propane-1-one and other acetophenone-based polymerization initiators, benzophenone, 2,2-dimethoxy 1,2 -Benzophenone polymerization initiators such as diphenylethane-1-one, benzophenone, [4- (methylphenylthio) phenyl] phenylmethanone, 4-hydroxybenzophenone, 4-phenylbenzophenone, 3,3', 4,4' Examples thereof include benzophenone-based polymerization initiators such as tetra (t-butylperoxycarbonyl) benzophenone, and thioxanthone-based polymerization initiators such as 2-chlorothioxanthone and 2,4-diethylthioxanthone. Only one kind of these photopolymerization initiators may be used, or two or more kinds thereof may be mixed.

If necessary, the composition for forming a hard coat layer contains other components such as a surface preparation agent, a leveling agent, an ultraviolet absorber, an ultraviolet stabilizer, an antioxidant, an antistatic agent, an antifoaming agent, and a diluent. It may be contained within a range that does not impair the effect of the present invention.

The diluting solvent used for preparing the composition for forming a hard coat layer is used for adjusting the viscosity of the composition for forming a hard coat layer, and is not particularly limited as long as it is non-polymerizable. With such a diluting solvent, a composition for forming a hardcourt layer can be easily applied mainly on a thermoplastic transparent base film.

Examples of the diluting solvent include toluene, xylene, ethyl acetate, propyl acetate, butyl acetate, methyl cellsolve, ethyl cell solution, ethyl cell solve acetate, propylene glycol monomethyl ether acetate, methyl alcohol, ethyl alcohol, isopropyl alcohol, butyl alcohol, and the like. Examples thereof include diacetone alcohol, acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, hexane, heptane, octane, decane, dodecane, propylene glycol monomethyl ether, 3-methoxybutanol and the like.

As a method of forming a hard coat layer on the thermoplastic transparent base film, for example, a method of applying the above composition for forming a hard coat layer on the thermoplastic transparent base film and then irradiating with ultraviolet rays to cure the composition. Can be mentioned. As a method of applying the composition for forming a hard coat layer on a thermoplastic transparent base film, a roll coat method, a spin coat method, a dip coat method, a brush coat method, a spray coat method, a bar coat method, a knife coat method, etc. Any known method such as a die coat method, a gravure coat method, a curtain flow coat method, a reverse coat method, a kiss coat method, and a comma coat method is adopted. At the time of coating, it is also preferable to pre-treat the surface of the thermoplastic transparent base film, such as a corona discharge treatment, in advance in order to improve the adhesion.

As the ultraviolet source used for irradiating ultraviolet rays, for example, a radiation source such as a high-pressure mercury lamp, a halogen lamp, a xenon lamp, a nitrogen laser, an electron beam accelerator, or a radioactive element is used. The irradiation amount of the ultraviolet rays is preferably 50 to 5000 mJ / cm ² as the integrated light amount at the wavelength of the ultraviolet rays of 365 nm.

The composition for the hard coat layer may contain translucent organic fine particles and the like to form a composition for forming an antiglare hard coat layer. The antiglare hardcoat layer forming composition can form an antiglare hardcoat layer (AG layer). The translucent organic fine particles are contained in order to positively form a light diffusing function, that is, surface irregularities in the antiglare hard coat layer. The translucent organic fine particles include styrene-acrylic copolymer resin, (meth) acrylic resin (refractive index 1.49), vinyl chloride resin (refractive index 1.54), polystyrene resin (refractive index 1.59), and polyethylene. One or more resin fine particles selected from a resin (refractive index 1.53), a melamine resin (refractive index 1.57 to 1.60), a polycarbonate resin (refractive index 1.59), and the like can be used. Of these, a (meth) acrylic resin or a styrene-acrylic copolymer resin is preferable because the refractive index can be easily adjusted.

[Anti-reflective layer]
The antireflection layer may be composed of a single layer or may be composed of a plurality of layers. Examples of the antireflection layer composed of a plurality of layers include those composed of a plurality of layers having different refractive indexes. When an antireflection layer in which a low refractive index layer and a high refractive index layer are laminated is used, the antireflection film has a hard coat layer on one surface of a thermoplastic transparent base material and a high refraction layer from the viewpoint of enhancing the antireflection effect. It is preferable that the rate layer and the low refractive index layer are laminated in this order. Further, in order to enhance the antireflection effect, a hard coat layer, a medium refractive index layer, a high refractive index layer, and a low refractive index layer may be laminated in this order on one surface of the thermoplastic transparent base film.

Each layer of the antireflection layer is formed by the composition for forming the antireflection layer. The antireflection layer forming composition is usually a composition containing a photocurable resin and a photopolymerization initiator, and in addition to these, metal oxide fine particles for adjusting the refractive index, which will be described later. Hollow silica fine particles and the like can be blended.
As the photocurable resin used in the composition for forming an antireflection layer, a fluoroacrylate having 2 to 6 acryloyloxy groups in the molecule is preferable. When the number of functional groups is within this range, a good cured film can be obtained without deterioration of the crosslink density and strength due to the increase in the number of unreacted functional groups. Further, for example, as a composition for forming an antireflection layer for forming a low refractive index layer, a mixture of hollow silica fine particles, a fluoroacrylate having 2 to 6 acryloyloxy groups in the molecule, and a photopolymerization initiator is used. It can be suitably used.
When the antireflection layer is composed of a plurality of layers, the composition for forming the high refractive index layer and the medium refractive index layer includes metal oxide fine particles such as titanium oxide, ATO, zinc antimonate, and ITO in the molecule. A mixture of an acrylate having 2 to 6 acryloyloxy groups and a photopolymerization initiator is preferable. This is because the primer effect of the hard coat layer and the low refractive index layer can be improved, and the adhesiveness of each layer can be enhanced.

The refractive index of the high refractive index layer, the medium refractive index layer, and the low refractive index layer represents the relative high and low refractive index, and is not particularly limited.
For example, when the antireflection layer is composed of a single layer, it is preferable that the low refractive index layer is laminated in this order on the hard coat layer as described above. In this case, the refractive index of the hard coat layer is preferably higher than that of the low refractive index layer.
When the antireflection layer is composed of two layers, it is preferable that the antireflection layer is composed of two layers, a high refractive index layer and a low refractive index layer, and as described above, the high refractive index is placed on the hard coat layer. It is preferable that the layer and the low refractive index layer are laminated in this order. In this case, it is preferable that the refractive index of the high refractive index layer is higher than the refractive index of the hard coat layer. The refractive index of the high refractive index layer is not particularly limited as long as it is higher than that of the low refractive index layer.
When the antireflection layer is composed of three layers, it is preferable that the antireflection layer is composed of three layers of a high refractive index layer, a medium refractive index layer and a low refractive index layer, and as described above, above the hard coat layer. It is preferable that the medium refractive index layer, the high refractive index layer, and the low refractive index layer are laminated in this order. In this case, it is preferable that the refractive index of the medium refractive index layer is higher than that of the hard coat layer. Further, the refractive index of each of the high refractive index layer, the medium refractive index layer, and the low refractive index layer is not particularly limited as long as the refractive index is higher in the order of the high refractive index layer, the medium refractive index layer, and the low refractive index layer.
The specific refractive index of each layer is not particularly limited, but the refractive index of the hard coat layer is 1.48 to 1.70, the refractive index of the high refractive index layer is 1.50 to 1.95, and the refractive index is medium. The refractive index of the rate layer may be selected in the range of 1.49 to 1.80, and the refractive index of the low refractive index layer may be selected in the range of 1.20 to 1.49. Within such a range, it is preferable to select the refractive index of each layer so as to have the above-mentioned relationship.

[Manufacturing method of thermoplastic sheet with antireflection function]
The thermoplastic sheet with an antireflection function of the present invention is preferably manufactured by a manufacturing method including the following steps (a) to (d).

[Step (a)]
Step (a) is a step of preparing a thermoplastic transparent sheet having a thickness of 0.1 to 15 mm and an antireflection film having a thickness of 0.005 to 0.4 mm including the thermoplastic transparent base film and the antireflection layer. ..

[Step (b)]
In step (b), one surface of a thermoplastic transparent sheet having a thickness of 0.1 to 15 mm and / or a surface having no antireflection layer of an antireflection film having a thickness of 0.005 to 0.4 mm is placed on one surface. This is a step of coating a volatile organic solvent with a coating amount of 0.08 to 80 g / m ² .
The application of the volatile organic solvent may be applied to one surface of the thermoplastic transparent sheet, or to the surface of the antireflection film not provided with the antireflection layer, or to both of them. However, from the viewpoint of improving workability, it is preferable to perform it on one surface of the thermoplastic transparent sheet.

In the present invention, when applying the volatile organic solvent, in addition to the volatile organic solvent, a component such as a resin having a function of adhering the film and the sheet (for example, an adhesive or an adhesive) is not used in combination. Is preferable. When these are used in combination, a layer such as an adhesive layer is formed at the interface between the thermoplastic transparent sheet and the antireflection film, and the heat resistance and machinability of the thermoplastic sheet tend to deteriorate. From the viewpoint of improving the heat resistance and machinability of the thermoplastic sheet, only the volatile organic solvent is placed on one surface of the thermoplastic transparent sheet and / or on the surface of the antireflection film without the antireflection layer. Is more preferable.

The volatile organic solvent used in the present invention is not particularly limited as long as it has a high affinity for the base film of the thermoplastic transparent sheet and the antireflection film, and is, for example, acetone (boiling point 56 ° C.) and methyl ethyl ketone (boiling point 80). ° C.), Methyl isopropyl ketone (94 ° C.), diethyl ketone (102 ° C.), methyl isobutyl ketone (boiling point 117 ° C.), 3-pentanone (boiling point 101 ° C.), methyl n-butyl ketone (boiling point 127 ° C.), cyclopentanone. Ketones such as (boiling 131 ° C);
Methyl acetate (boiling point 57 ° C), ethyl acetate (boiling point 77 ° C), isopropyl acetate (boiling point 85 ° C), n-propyl acetate (boiling point 101 ° C), n-butyl acetate (boiling point 125 ° C), isobutyl acetate (boiling point 118 ° C) ), N-amyl acetate (boiling point 142 ° C.), methyl lactate (boiling point 145 ° C.) and other esters;
Methanol (boiling point 65 ° C), ethanol (boiling point 78 ° C), n-propanol (boiling point 97 ° C), isopropanol (boiling point 82 ° C), n-butanol (boiling point 117 ° C), 1-pentanol (boiling point 137 ° C), 2 -Alcohols such as methyl-1-pentanol (boiling point 148 ° C);
Aromatic hydrocarbons such as benzene (boiling point 80 ° C), toluene (boiling point 111 ° C), ethylbenzene (boiling point 136 ° C), xylene (boiling point 138 ° C);
Cyclic ethers such as tetrahydrofuran (boiling point 66 ° C.), tetrahydropyran (boiling point 88 ° C.), 1,4-dioxane (boiling point 101 ° C.);
Ethylene glycol monomethyl ether (boiling point 124 ° C), ethylene glycol monoethyl ether (boiling point 135 ° C), ethylene glycol dimethyl ether (boiling point 84 ° C.), propylene glycol monomethyl ether (boiling point 119 ° C.), propylene glycol monoethyl ether (boiling point 132 ° C.) , Polyhydric alcohol alkyl ethers such as propylene glycol dimethyl ether (boiling point 97 ° C.);
Examples thereof include polyhydric alcohol alkyl ether acetates such as ethylene glycol monomethyl ether acetate (boiling point 145 ° C.) and diethylene glycol monomethyl ether acetate (boiling point 143 ° C.).

Among these, from the viewpoint of solubility and boiling point, acetone, methyl ethyl ketone, methyl isobutyl ketone, 3-pentanone, methyl acetate, ethyl acetate, normal butyl acetate, toluene, methanol, ethanol, isopropanol, isobutyl acetate, methyl lactate, ethylene. Glycol monomethyl ether, ethylene glycol monoethyl ether, propylene glycol monomethyl ether, propylene glycol monoethyl ether, diethylene glycol dimethyl ether, ethylene glycol monomethyl ether acetate, propylene glycol monomethyl ether acetate are preferable, and methyl ethyl ketone, butyl acetate, butanol and toluene are more preferable. Preferred. These organic solvents can be used alone or in combination of two or more.

The coating amount of the volatile organic solvent is preferably 0.08 to 80 g / m ² from the viewpoint of adjusting the residual amount of the volatile organic solvent of the thermoplastic sheet to a desired range. Further, from the viewpoint of adjusting the residual amount of the volatile organic solvent to a desired range while shortening the drying time, it is more preferably 0.1 to 30 g / m ² , more preferably 0.2 to 10 g / m ² . Is more preferable.

[Step (c)]
In the step (c), one surface of the thermoplastic transparent sheet and the surface of the antireflection film not provided with the antireflection layer are opposed to each other with the volatile organic solvent remaining, and the above-mentioned step (c) is performed. This is a process of crimping an antireflection film and a thermoplastic transparent sheet to obtain a crimped sheet.
The method of crimping is not particularly limited, and a generally known method can be appropriately adopted, but a roll press is preferable.
The crimping is performed so that one surface of the thermoplastic transparent sheet and the surface of the antireflection film not provided with the antireflection layer face each other. That is, in the above step (b), the pressure bonding is performed so that the surface coated with the volatile organic solvent becomes the interface between the sheet and the film.
In the step (c), the residual amount of the volatile organic solvent is preferably 0.04 to 40 g / m ² . Since the residual amount of the volatile organic solvent in the step (c) depends on the coating amount, in the case of continuous coating, it can be controlled not only by the supply amount of the volatile organic solvent but also by the sheet transport speed. .. The time from application to overlaying and crimping of the antireflection film is usually 0.2 to 30 seconds, preferably 1 to 5 seconds. Further, the crimping is performed under a pressure of usually 0.1 to 5.0 kgf / cm ² , preferably 0.5 to 2.0 kgf / cm ² , as the pressure and surface pressure at the time of crimping.
The residual amount of the volatile organic solvent in the step (c) means the residual amount of the volatile organic solvent immediately before the thermoplastic transparent sheet and the antireflection film are pressure-bonded. Immediately before crimping means 1 second before crimping. The residual amount of the volatile organic solvent is calculated from the coating film thickness of the solvent and the specific gravity of the solvent obtained from the reflection spectrum.

[Step (d)]
The step (d) is a step of drying the crimping sheet obtained in the above step (c). Drying can usually be carried out at a temperature of 20 to 100 ° C., preferably 30 to 50 ° C., and appropriately under ventilation conditions. The drying time is preferably 10 seconds to 8 minutes, more preferably 40 seconds to 2 minutes. By increasing the drying temperature or lengthening the drying time, the amount of residual solvent tends to decrease. It is preferable that these drying conditions are carried out while keeping the production efficiency within the range of the residual amount of the predetermined volatile organic solvent of the present invention.

[Image display device]
The thermoplastic sheet with antireflection function of the present invention has excellent optical properties, maintains a good appearance even after a high temperature load during molding, and has peeling strength to withstand cutting stress, so that it is a display, a touch panel, and a portable information terminal. It can be suitably used for an image display device such as, and particularly preferably an image display device such as a center information display, a meter panel, and a heat control panel. Specifically, it can be used as an image display device provided with a heat-molded product of the thermoplastic sheet with antireflection function of the present invention on the surface.

Hereinafter, the present invention will be specifically described with reference to examples.
First, the evaluation method in each example is shown.
<Measurement of residual amount of volatile organic solvent>
1 g was collected by cutting into a thermoplastic sheet with antireflection function, the cut sheet sample was placed in a 20 mL glass vial, sealed, and heated at 150 ° C. for 30 minutes. Then 0.5 mL was sampled from the headspace and analyzed by gas chromatograph. From the measured value (amount of volatile organic solvent) calculated based on the calibration curve and the weight of the sheet sample, the residual amount [mass%] of the volatile organic solvent of the thermoplastic sheet with the antireflection function was calculated according to the following formula (1).
Residual amount of volatile organic solvent [mass%] = 100 x amount of volatile organic solvent / sheet sample weight ... Formula (1)
The gas chromatographs and the like used are as follows.
Gas chromatograph: GC-2010 [manufactured by Shimadzu Corporation]
Column: "Zebron ZB-1" 30 m x 0.53 mm, liquid phase thickness 5 μm (manufactured by phenomenex)

<Haze value>
A haze value (%) as an optical characteristic was measured using a haze meter [NDH2000 manufactured by Nippon Denshoku Kogyo Co., Ltd.]. When the difference between the haze value of the antireflection film and the haze value of the thermoplastic sheet with the antireflection function is 1% or less, the antireflection film can be adhered to the thermoplastic transparent sheet without impairing the characteristics of the antireflection film. When the antireflection film is applied to both sides of the thermoplastic transparent sheet, if the difference between the sum of the haze values of each antireflection film and the haze value of the thermoplastic sheet with antireflection function is 1% or less, the antireflection film The antireflection film can be adhered to the thermoplastic transparent sheet without impairing the characteristics.

<Visual reflectance Y (SCI)>
In order to eliminate the reflection on the back surface of the measurement surface, the back surface of the film was roughened with sandpaper and adjusted by painting with black paint. The measurement surface of the adjusted film is measured by "SD6000" manufactured by Nippon Denshoku Co., Ltd., and the tristimulus value Y of the object color due to reflection in the XYZ color system (CIE standard Illuminant D65) specified by JISZ 8701 is obtained. Calculated.
<Appearance>
○: Floating, blistering, cracks, wrinkles, no embrittlement ×: Floating, blistering, cracks, wrinkles, or embrittlement

<Heat resistance>
After storage for 1000 hours under each of three conditions of 120 ° C., 95 ° C., and 60 ° C., the heat resistance was judged based on the above appearance criteria. It was judged as follows according to the temperature that did not become x in appearance.
◎ ◎: Appearance after heat resistance test after storage at 120 ° C for 1000 hours ○
⊚: Appearance after heat resistance test after storage at 95 ° C for 1000 hours ○, Appearance after heat resistance test after storage at 120 ° C for 1000 hours ×
◯: Appearance after heat resistance test after storage at 60 ° C for 1000 hours ○, Appearance after heat resistance test after storage at 95 ° C for 1000 hours ×
×: Appearance after heat resistance test after storage at 60 ° C for 1000 hours ×
<Cutting resistance>
Cutting resistance was determined based on the presence or absence of peeling at the film / sheet interface during cutting on the end face cut with a rotary electric saw. For those that did not peel off at the film / sheet interface during cutting, further trimming the edges with a tapered surface finish using a router to remove the peeling at the film / sheet interface of the machined surface. The processing resistance was judged by the presence or absence.
◎: Peeling during router processing, none ○: No peeling during cutting, peeling during router processing ×: Peeling during cutting

The name (abbreviation) and layer structure of the thermoplastic transparent sheet used in each Example and Comparative Example and the antireflection film are shown below. In the display of the layer structure, for example, when A / B is displayed, it means that the structure is a two-layer structure in which the A layer and the B layer are laminated, and when A / B / A is displayed, the A layer is displayed. , B layer, and A layer are laminated in this order, which means that the structure is three layers.
Further, the polymethylmethacrylate resin is abbreviated as "PMMA" and the polycarbonate resin is abbreviated as "PC". Further, the hard coat layer is abbreviated as "HC" and the anti-glare layer is abbreviated as "AG".
<Thermoplastic transparent sheet>
# C101: PMMA / PC / PMMA, 3-layer sheet, "Technoloy C101" manufactured by Sumitomo Chemical Co., Ltd. (trade name)
# 1151: PC sheet, single layer sheet, "Panlight sheet PC-1151" manufactured by Teijin Limited (trade name)
# 1600: PC sheet, single layer sheet, "PC-1600" manufactured by Takiron Co., Ltd. (trade name)
DG-A: PMMA sheet, single layer sheet, Asahi Kasei Techno Plus Co., Ltd. methacrylic resin sheet "Deraglass A" (trade name)

<Anti-reflective film>
HCAR1: The thermoplastic transparent base film is a PC / PMMA two-layer film, and the entire antireflection film is a PC / PMMA / HC / antireflection layer. The antireflection layer has a two-layer structure consisting of a high refractive index layer and a low refractive index layer.
AGAR1: The thermoplastic transparent base film is a two-layer film of PC / PMMA, and the layer structure of the entire antireflection film is PC / PMMA / AG layer / antireflection layer.
HCAR2: The thermoplastic transparent base film is a PMMA single-layer film, and the entire antireflection film is a PMMA / HC / antireflection layer. The antireflection layer has a two-layer structure consisting of a high refractive index layer and a low refractive index layer.

<Volatile organic solvent>
MEK: Methyl ethyl ketone MEK / BuAc: Methyl ethyl ketone / butyl acetate = 80/20 (mass ratio) mixed solvent MEK / Toluene: Methyl ethyl ketone / toluene = 80/20 (mass ratio) mixed solvent MEK / 1-butanol: Methyl ethyl ketone / 1- Butanone = 80/20 (mass ratio) mixed solvent Depressant-containing solvent: Acrylic pressure-sensitive adhesive "SK Dyne 2094" (nonvolatile content 25% by mass, methyl ethyl ketone 75% by mass) manufactured by Soken Kagaku Co., Ltd. and a cross-linking agent. Solvent containing "E-5XM" and "L-45"

(Production Example 1: Production of HCAR1)
(1) Preparation of composition for forming a hard coat layer (HC-1) The ultraviolet curable resin shown below and a photopolymerization initiator were mixed to obtain HC-1.
"EBECRYL8402" manufactured by Daicel Cytec Co., Ltd. using the following three components as an ultraviolet curable resin ... 42.5% by mass
"KAYARAD DPCA-20" manufactured by Nippon Kayaku Co., Ltd .... 12.5% by mass
Kyoeisha Chemical Co., Ltd. "Light Acrylate 1.9ND-A" ... 41% by mass
"IRGACURE184 (I-184)" manufactured by Ciba Specialty Chemicals Co., Ltd. using the following components as a photopolymerization initiator ... 4% by mass

(2) Preparation of Composition H-1 for Forming High Refractive Rate Layer 70 parts by mass of zinc antimonate fine particle dispersion (Celnax CX-603M-F2 manufactured by Nissan Chemical Industry Co., Ltd.) in terms of solid content, urethane acrylate (Molecular weight 1400, viscosity at 60 ° C. 2500-4500 Pa · s, manufactured by Nippon Synthetic Chemical Industry Co., Ltd., Shikou UV7600B) 25 parts by mass, photopolymerization initiator (Ciba Specialty Chemicals Co., Ltd., Irgacure 184) 5 parts by mass and 500 parts by mass of isopropyl alcohol were mixed to obtain a composition for forming a high refractive index layer (containing zinc antimonate fine particle curable coating liquid). The refractive index of H-1 (after curing) was 1.58.

(3) Preparation of Composition L-1 for Low Refractive Index Layer 40 parts by mass of hollow silica fine particles having a particle size of 60 nm, 60 parts by mass of dipentaerythritol hexaacrylate (manufactured by Nippon Kayaku Co., Ltd., trade name "DPHA") , Photopolymerization initiator (Ciba Specialty Chemicals Co., Ltd., Irgacure 907) 5 parts by mass, Silicon additive (Big Chemy Japan Co., Ltd., BYKUV-3570) 8 parts by mass, Silicon additive (Shinetsu Chemical Industry Co., Ltd.) A composition for a low refractive index layer by mixing 5 parts by mass of TIC2457 (manufactured by Co., Ltd.), 0.5 parts by mass of an alumina additive (NANOBYKUV-3601 manufactured by Big Chemie Japan Co., Ltd.), and 2000 parts by mass of isopropyl alcohol. (Silica-containing curable coating liquid) was obtained. The refractive index of L-1 (after curing) was 1.39.

(4) Production of HCAR1 Thermoplastic transparent base film (PC / PMMA) consisting of a two-layer structure consisting of a 0.2 mm thick polycarbonate resin layer and a polymethylmethacrylate resin layer: "C001" manufactured by Sumitomo Chemical Co., Ltd. The composition for forming a hard coat layer (HC-1) was applied onto the PMMA layer with a roll coater so that the dry film thickness was 7 μm, and dried at 80 ° C. for 2 minutes. Then, under a nitrogen atmosphere, ultraviolet rays were irradiated with a 120 W high-pressure mercury lamp (manufactured by Nippon Battery Co., Ltd.) (integrated light intensity 300 mJ / cm ² ), and the composition for forming a hard coat layer was cured to form a hard coat layer.
Next, the composition for forming a high refractive index layer H-1 is applied onto the hard coat layer so that the thickness at the time of drying is 150 nm, and then an ultraviolet irradiation device (manufactured by Eye Graphics Co., Ltd.) is used under a nitrogen atmosphere. , 120 W high-pressure mercury lamp) was irradiated with ultraviolet rays of 300 mJ / cm ² to cure the composition for forming a high refractive index layer to form a high refractive index layer.
Finally, the composition L-1 for a low refractive index layer is applied onto the high refractive index layer so that the thickness at the time of drying is 90 nm, and then an ultraviolet irradiation device (manufactured by Eye Graphics Co., Ltd.) is applied under a nitrogen atmosphere. , 120 W high-pressure mercury lamp) was irradiated with ultraviolet rays of 300 mJ / cm ² , and the composition for the low refractive index layer was cured to form the low refractive index layer, and an antireflection film (HCAR1) was produced.

(Manufacturing Example 2: Manufacture of HCAR2)
Antireflection film (PMMA): Antireflection film (PMMA) manufactured by Sumitomo Chemical Co., Ltd., except that "S014G-125, thickness 0.1 mm" is used as the thermoplastic transparent base film, in the same manner as in Production Example 1. HCAR2) was produced.

(Manufacturing Example 3: Manufacture of AGAR1)
(1) Preparation of composition for forming an antiglare hard coat layer (a) As an acrylic resin having a glass transition temperature of 84 ° C. or higher, PMMA (manufactured by SIGMA-ALDRICH, "Poly (Methyl methacryllate)" weight average molecular weight 97, As a urethane acrylate having 000, Tg = 105 ° C.) of 65% by mass, (b) having three or more (meth) acrylic groups in one molecule and having a weight average molecular weight of 15,000 or less, manufactured by Nippon Synthetic Chemical Industry Co., Ltd., " 22% by mass of "purple light UV7600B", (c) 9% by mass of "MX-150" (crosslinked acrylic monodisperse particles, average particle size 1.5 μm) manufactured by Soken Kagaku Co., Ltd. as translucent organic fine particles, (d) light. A composition for forming an antiglare hard coat layer was obtained by mixing 4% by mass of "Irgacure-184" manufactured by Ciba Specialty Chemicals Co., Ltd. as a polymerization initiator, and the composition had a solid content concentration of 10% by mass. Methyl ethyl ketone (MEK) was mixed so as to be completely dissolved, and a coating liquid containing a composition for forming an antiglare hard coat layer was obtained. In addition, components other than (c) translucent organic fine particles "MX-150" (crosslinked acrylic monodisperse particles manufactured by Soken Kagaku Co., Ltd., average particle size 1.5 μm) were completely dissolved in the coating liquid, and (c). It was confirmed that the translucent organic fine particles "MX-150" (crosslinked acrylic monodisperse particles manufactured by Soken Kagaku Co., Ltd., average particle size 1.5 μm) were uniformly dispersed in the paint.

(2) Production of Antiglare Antireflection Film AGAR1 A transparent base material poly of a two-layer laminate consisting of a polycarbonate layer and a polymethylmethacrylate layer is coated with a coating liquid containing the above-mentioned antiglare hard coat layer forming composition. The methyl methacrylate layer was coated with a roll coater so that the dry film thickness was 0.2 μm, and dried at 80 ° C. for 2 minutes. The dry film thickness is substantially the film thickness of the hard coat layer. After that, ultraviolet rays were irradiated with a 120 W high-pressure mercury lamp [manufactured by Nippon Battery Co., Ltd.] (integrated light intensity 300 mJ / cm ² ) to cure the composition for forming the hard coat layer, and an antiglare hard coat layer was formed on the transparent substrate. Formed.

Subsequently, (a) 5% by mass of "Optur DAC-HP" manufactured by Daikin Industries, Ltd. as a fluorine-containing ultraviolet curable resin, and (b) a polyether-modified polydimethylsiloxane having an acrylic group or a polyester-modified having an acrylic group. 4% by mass of "BYK3500" manufactured by Big Chemie Co., Ltd. as a polydimethylsiloxane, and "OD2H2A" (1,10-di) manufactured by JGC Catalysts and Chemicals Co., Ltd. as a binder capable of copolymerizing with (c), (a), and (b). Acryloyloxy-2,9-dihydroxy-4,4,5,5,6,6,7,7-octafluorodecane) in 43% by mass, (d) as translucent organic fine particles manufactured by JGC Catalysts and Chemicals Co., Ltd. A composition for forming an antireflection layer containing 43% by mass of "Thruria NAU" and 5% by mass of "Irgacure-907" manufactured by BASF Co., Ltd. as a photopolymerization initiator has a solid content concentration of 5% by mass. As described above, it was diluted with IPA to obtain a coating liquid (L-1) for forming an antireflection layer.

The obtained coating liquid (L-1) for forming an antireflection layer had a thickness of about 0.1 μm on the antiglare hard coat layer (when the reflection spectrum was measured, the minimum reflectance wavelength was about 600 nm). It was applied so as to have a certain thickness), and dried at 80 ° C. for 2 minutes. An antireflection layer is formed by irradiating ultraviolet rays with an integrated light amount of 300 mJ / cm ² using an ultraviolet irradiation device (120 W high-pressure mercury lamp manufactured by Eye Graphics Co., Ltd.) in a nitrogen atmosphere to cure the antireflection layer forming composition. It was formed and an antiglare antireflection film (AGAR1) was produced.

[Example 1]
A thermoplastic transparent sheet (# 1151, thickness 2.0 mm) with a width of 20 cm and a length of 50 cm is set on the slider of the applicator manufactured by Tester Sangyo Co., Ltd., and the line speed is 4.43 m / at room temperature (about 20 ° C). While feeding at min, a predetermined amount of volatile organic solvent (MEK) is applied to one surface of the thermoplastic transparent sheet, and an antireflection film (HCAR1, equivalent to about 9 cm) is applied from behind for 2.0 seconds (corresponding to about 9 cm) from the application position. (Thickness 0.2 mm) was supplied and laminated and crimped by hand using a gully plate roller to obtain a crimping sheet. The crimping was performed so that one surface of the thermoplastic transparent sheet and the surface of the antireflection film not provided with the antireflection layer faced each other. Next, the crimping sheet was dried under a drying condition of a drying temperature of 40 ° C. and a drying time of 60 seconds to obtain a thermoplastic sheet with an antireflection function.
Table 1 shows the production conditions of the thermoplastic sheet with antireflection function of the present invention in each example together with the evaluation results. In addition, Table 2 shows the manufacturing conditions of the thermoplastic sheet with antireflection function, which is not the one in the present invention in each comparative example, together with the evaluation results.

[Examples 2 to 16, Comparative Examples 1 to 4]
A thermoplastic sheet with an antireflection function was prepared in the same manner as in Example 1 except that the types of the thermoplastic transparent sheet, the antireflection film, and the volatile organic solvent used, and the drying conditions were changed as shown in Table 1 or 2. Obtained. The evaluation results are shown in Tables 1 and 2 together with the manufacturing conditions.

[Comparative Example 5]
Polymethylmethacrylate film (PMMA), which is a thermoplastic transparent base film instead of the antireflection film: "S014G-125, thickness 0.1 mm" manufactured by Sumitomo Chemical Co., Ltd. is used, and the thermoplastic transparent sheet used is volatile. A thermoplastic sheet was obtained in the same manner as in Example 1 except that the type of the sex organic solvent and the drying conditions were changed as shown in Table 2. Table 2 shows the evaluation results together with the manufacturing conditions.

[Comparative Example 6]
Reflection was carried out in the same manner as in Example 1 except that the above-mentioned adhesive-containing solvent was used instead of the volatile organic solvent, and the thermoplastic transparent sheet, antireflection film, and drying conditions used were changed as shown in Table 2. A thermoplastic sheet with a preventive function was obtained. Table 2 shows the evaluation results for both manufacturing conditions.

Regarding the evaluation results shown in Table 1, all of the thermoplastic sheets with antireflection function of the present invention of Examples 1 to 16 have excellent antireflection characteristics without a decrease in haze, and a good appearance is a high temperature load at the time of molding. It was clarified that it was maintained afterwards and had a peeling strength that could withstand cutting stress.

On the other hand, in Comparative Example 1 shown in Table 2, the residual amount of the solvent immediately before bonding was excessive, and as a result, the residual amount of the solvent of the thermoplastic sheet with the antireflection function exceeded the appropriate range, and this result. , The heat resistance has deteriorated. In Comparative Example 2, the residual amount of the solvent immediately before bonding was too small, and as a result, the residual amount of the solvent of the thermoplastic sheet with the antireflection function fell below the appropriate range, and as a result, the cutting resistance deteriorated.
In Comparative Example 3, the residual amount of the solvent immediately before bonding was excessive, and as a result, the residual amount of the solvent of the thermoplastic sheet with the antireflection function exceeded the appropriate range, and as a result, the heat resistance deteriorated.

Further, in Comparative Example 4, the drying temperature was too low, and the residual amount of the solvent in the thermoplastic sheet with the antireflection function was excessive, so that the heat resistance was deteriorated. In Comparative Example 5, since the film was not coated with the hard coat layer and the antireflection layer, the surface opposite to the bonded surface of the film was eroded by the solvent, resulting in embrittlement and poor appearance. rice field. In Comparative Example 6, an adhesive was used, and since the adhesive layer was present on the surface of the thermoplastic transparent sheet, heat resistance and machinability were deteriorated.

Claims (6)

It is a welded body of a thermoplastic transparent sheet having a thickness of 0.1 to 15 mm and an antireflection film having a thickness of 0.005 to 0.4 mm provided on at least one surface of the thermoplastic transparent sheet, and is volatile. A thermoplastic sheet with an antireflection function in which the residual amount of the organic solvent is 0.005 to 4.3% by mass. The method for manufacturing a thermoplastic sheet with an antireflection function according to claim 1, which comprises the following steps (a) to (d).
Step (a): A step step (b) of preparing a thermoplastic transparent sheet having a thickness of 0.1 to 15 mm and an antireflection film having a thickness of 0.005 to 0.4 mm including the thermoplastic transparent base film and the antireflection layer. ): A volatile organic solvent on one surface of a thermoplastic transparent sheet having a thickness of 0.1 to 15 mm and / or a surface of an antireflection film having a thickness of 0.005 to 0.4 mm without an antireflection layer. Step of coating with a coating amount of 0.08 to 80 g / m ² (c): Reflection of the antireflection film and one surface of the thermoplastic transparent sheet with the volatile organic solvent remaining. Step (d) of obtaining a crimp sheet by crimping the antireflection film and the thermoplastic transparent sheet with the surface not provided with the prevention layer facing each other: the crimp sheet obtained in the step (c). Drying process The method for producing a thermoplastic sheet with an antireflection function according to claim 2, wherein the drying temperature in the step (d) is 20 to 100 ° C. The method for producing a thermoplastic sheet with an antireflection function according to claim 2 or 3, wherein the residual amount of the volatile organic solvent in the step (c) is 0.04 to 40 g / m ² . The thermoplastic transparent sheet is a single-layer sheet made of any one of polymethylmethacrylate resin, methylmethacrylate-styrene copolymer resin and polycarbonate resin, polymethylmethacrylate resin / polycarbonate resin two-layer sheet, or polymethylmethacrylate resin /. It is a three-layer sheet of polycarbonate resin / polymethylmethacrylate resin,
The thermoplastic transparent base film is a single-layer film made of any one of polymethylmethacrylate resin, methylmethacrylate-styrene copolymer resin, ABS resin, and polycarbonate resin, and a two-layer film of polymethylmethacrylate resin / polycarbonate resin. The method for producing a thermoplastic sheet with an antireflection function according to any one of claims 2 to 4, which is a three-layer film of polymethylmethacrylate resin / polycarbonate resin / polymethylmethacrylate resin. An image display device comprising a heat-molded product of the thermoplastic sheet with an antireflection function according to claim 1 on the surface.