JP2003280234A - Image recording medium and image display sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image recording medium useful as a protective film for an image display sheet and to provide an image recording medium in which fracture of a thermoplastic resin film is prevented when the image display sheet is folded, the tackiness at normal temperature on the toner transfer face of the film is decreased and sticking of films when stored in a roll state is prevented. <P>SOLUTION: The image recording medium contains a thermoplastic resin film having a back face where an image forming toner is to be transferred and having a top face opposing to the back face. The medium comprises substantially a single layer of the above resin film, with the surface of the resin film being the outermost surface, or the medium is a multilayered body comprising the resin film and a protective layer disposed to cover the surface of the resin film and allowing the surface of the protective layer as the outermost surface, and the medium has light transmitting property to make an image visible through the outermost surface. The resin film comprises a resin component containing a tough resin and the glass transition temperature of the resin film ranges from 0 to 100°C. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in an image recording medium having a light-transmitting property that allows the image to be visually recognized from the outermost surface in the state where a toner image thermally transferred is formed on the back surface. The image recording medium of the present invention is particularly useful for producing an image display sheet by adhering it to a sheet substrate as a protective film. In the image recording medium of the present invention, since the thermoplastic resin film used as the toner transfer layer contains a tough resin, when the image display sheet completed by adhering to the sheet base material is folded and stored and transported, it is thermoplastic. It is possible to effectively prevent damage such as cracks in the resin film.

[0002]

2. Description of the Related Art An image display including a light-transmissive protective film and a sheet base material which is arranged so as to face the back surface of the protective film and is adhered to the protective film, and which includes an image visually recognizable through the protective film. The seat is, for example,
An image is formed on the surface of the sheet base material using toner printing,
After that, the printed surface is covered with a protective film to be manufactured. However, this method is not suitable when it is difficult to form an image on the surface of the sheet base material. For example, when the surface of the sheet base material has a coating layer made of a cured resin having low adhesion to toner, it is difficult to form an image on the surface of the sheet base material. The coating layer made of cured resin has a softening point higher than the thermal transfer temperature of the toner,
This is because it is difficult for the toner transfer process to soften.

Also, in order to enhance the appearance and design of the completed image display sheet, the sheet is also subjected to a designing process such as embossing and the like, and a wallpaper having a surface unevenness is used as the sheet base material. It is difficult to form an image on the surface of the base material. This is because when the toner is transferred to such a design processed sheet base material, the toner can only adhere to the convex portions of the surface under normal transfer conditions. Further, when the transfer temperature and the transfer pressure are increased in order to improve the fluidity of the toner and bring the toner into close contact with the concave portion of the surface, the unevenness on the surface of the sheet base material is deformed, and the design is impaired.

On the other hand, a light-transmissive image recording medium is used as a protective film, the toner is transferred to the rear surface (toner transfer surface) of the protective film, and an image visible through the protective film is formed from the toner. A method of adhering a sheet base material is also known. According to this method
Even when it is difficult to form an image on the surface of the sheet base material, an image display sheet containing an image visually recognizable through the protective film can be easily manufactured.

Such an image recording medium, that is, a protective film capable of forming an image on the back surface is disclosed in, for example, JP-A-63 / 1988.
-173693. This publication discloses an intermediate transfer consisting of a temporary carrier (carrier film) and an image-receiving layer which is detachable from the temporary carrier using a material capable of dyeing a heat transfer dye on one surface thereof. A medium is disclosed. This image receiving layer functions as a constituent material of a protective film capable of forming an image on the back surface. This image-receiving layer is usually
It is formed from a thermoplastic resin film containing a thermoplastic resin such as polyester resin or acrylic resin. Further, in the disclosure of this publication, a protective layer made of a relatively hard resin such as a hardened acrylic resin is laminated on an image receiving layer, and this laminate is used as a protective film including an imageable image receiving layer.

The method of using this intermediate transfer medium (method of decorating an article) is disclosed as follows. That is, an image is formed by a thermal transfer method using a thermal transfer sheet having a heat transferable dye layer in the image receiving layer and a thermal head, and then the protective film on which the image is formed is thermocompression-bonded to a transferred article via a fusion sheet. After that, the temporary carrier is removed. By using this intermediate transfer medium and the sheet-shaped substrate as the transferred article, an image display sheet formed on the back surface of the protective film and containing an image visually recognizable through the protective film can be manufactured.

Japanese Unexamined Patent Publication No. 2001-113890 discloses a thermal transfer film having a multilayer structure in which a clear coat layer, an ink layer, and a polyester adhesive layer are sequentially laminated on a polyester carrier film. A release agent layer is disposed on the surface of the carrier film that contacts the clear coat layer. This clear coat layer functions as a protective film capable of forming an image on the back surface.

The method of using this thermal transfer film is disclosed as follows. That is, in a transfer method for performing a predetermined printing on a transfer object having a three-dimensional shape with a thermal transfer film, the transfer film is arranged so as to be at a predetermined position of the transfer target, and the transfer target is transferred while heating the thermal transfer film. It is pressure-bonded to the object, and the clear coat layer with the ink layer is heat-bonded to the transfer target through the polyester adhesive layer,
It then includes removing the carrier film.
Therefore, by using this thermal transfer film and the sheet-shaped substrate as the transferred material, an image display sheet including an image formed on the back surface of the protective film and visually recognizable through the protective film can be manufactured. It should be noted that this publication does not disclose a resin for forming a clear coat layer, nor does it disclose that toner printing (toner thermal transfer) is possible on such a clear coat layer. .

US Pat. No. 5,681,631 (International Application Publication No. WO95 / 18720) discloses the following image transferable image overlay composite.
Is disclosed. The overlay composite disclosed herein comprises a premask layer (temporary carrier) and a protective layer (protective film), which is capable of receiving thermal transfer toner and functions as a backside imageable protective film. . The protective layer is usually formed of a thermoplastic resin. As the thermoplastic resin, for example, an acrylic copolymer or a homopolymer which is a polymer of a monomer containing methyl methacrylate, ethyl methacrylate or the like, polyurethane, or vinyl chloride-vinyl acetate copolymer is disclosed.

In this publication, one example of the method of using the overlay composite is disclosed as follows. That is, an image is printed on the outermost surface (rear surface) of the protective layer of the image overlay composite, the image-recorded protective layer is bonded to the toner receptor, and the premask layer is peeled and removed from the protective layer. This makes it possible to manufacture a laminate including an image formed on the back surface of the protective layer and visible through the protective layer. The toner receiver is, for example, a laminated film having a toner-receptive flexible film and a pressure-sensitive adhesive layer. To bond the image-recorded protective layer to the toner receiver, it is usually pressed while heating to soften the toner receiver. By adhering the laminate containing the image produced in this manner to the sheet-shaped substrate via the pressure-sensitive adhesive layer, an image display sheet containing an image visible through the protective layer can be produced.

It is also possible to adhere the image-recorded protective film to an adherend through a solvent activated adhesive. However, when forming an image display sheet, a solvent coating step and a drying step for shortening the time until the solvent is dried and the adhesion is completed are necessary, and it is difficult to simplify the manufacturing process. . Also, a sheet base material that is not resistant to organic solvents cannot be used. An example of using such a solvent activated adhesive is disclosed in, for example, JP-A-58-8479.
No. 1, JP-A-58-84792, and JP-A-58-84793.

[0012]

As described above, an image-recorded protective film (a protective film having a visible image formed through the protective film on its back surface) and a sheet substrate are bonded to each other with a heat-sensitive adhesive or the like. It is possible to form an image display sheet by bonding with an agent. However, it has been found that the conventional image recording medium (protective film capable of forming an image) has the following problems.

As described above, in the image recording medium used as the protective film, the toner transfer layer (receptive layer) having the toner transfer surface is formed of the thermoplastic resin film. However, in a thermoplastic resin film formed by using a normal resin, when the image display sheet that is completed by adhering to a sheet base material is folded and stored, or is transported,
Damage such as cracks sometimes occurred in the thermoplastic resin film. Further, when the unevenness of the sheet base material surface includes a relatively large convex portion (or concave portion) (for example, the peak-to-valley is 150 μm or more), the sheet base material surface The unevenness could not be followed, and the thermoplastic resin film was sometimes broken, such as cracking when adhered to the surface of the sheet base material.

On the other hand, the breakage of the thermoplastic resin film as described above is caused by a relatively soft thermoplastic resin film (for example, a thermoplastic resin film having a relatively low glass transition point).
It can be avoided by using. However, it has been found that in a relatively soft thermoplastic resin film, if the resin components contained in the thermoplastic resin film are erroneously selected, the room temperature tack on the toner transfer surface of the film becomes high. If the room temperature tack of the toner transfer surface of the film is high, when the long protective films are rolled and stored, the protective films that are overlapped with each other stick to each other. Adhesion between protective films is performed by unrolling a roll of protective film to record (form) an image, or unrolling a roll of an image-recorded protective film and adhering the protective film to a sheet substrate to form an image. Making display sheets difficult to manufacture.

Therefore, an object of the present invention is an image recording medium useful as a protective film for an image display sheet, which effectively prevents breakage of the thermoplastic resin film when the image display sheet is folded and stored or transported. Yes, and
An object of the present invention is to provide an image recording medium capable of lowering the room temperature tack of the toner transfer surface of the film and effectively preventing sticking of each other even when the film is wound into a long roll and stored.

[0016]

The present invention includes a thermoplastic resin film having a back surface, which is a toner transfer surface on which toner for forming an image is thermally transferred, and a surface opposite to the back surface. A substantially single layer of a thermoplastic resin film, the surface of the thermoplastic resin film is the outermost surface, or (ii) the thermoplastic resin film,
It is composed of a laminate including a protective layer arranged so that the back surface is directed to cover the surface of the thermoplastic resin film, the surface of the protective layer facing the back surface is the outermost surface, and the image is formed. Then, in the image recording medium having a light-transmitting property in which the image is visible from the outermost surface, the thermoplastic resin film is at least 1 selected from the group consisting of polyurethane, ethylene-acrylic acid copolymer and phenoxy resin. Image recording medium comprising a resin component containing one tough resin and having a glass transition point of 0 to 100 ° C. determined by using a differential scanning calorimeter of the thermoplastic resin film. And solve the above problems.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION [Function] In the image recording medium of the present invention, the thermoplastic resin film contained as the toner transfer layer contains the toughness resin as described above. The thermoplastic resin film containing such a toughness resin is particularly toughness (also referred to as toughness. The property that is evaluated by the product of the breaking strength and the breaking elongation as an index and is not easily broken by an external force). Be excellent. Therefore, when the image recording medium is used as a protective film and the image display sheet is formed by adhering to the surface of the sheet base material, it is possible to effectively enhance the followability to unevenness (unevenness) of the surface of the sheet base material. .
Further, it is possible to effectively prevent breakage of the thermoplastic resin film when the completed image display sheet is folded and stored and transported.

The room temperature tack of a thermoplastic resin film containing a tough resin is relatively low, but it is insufficient as it is. Therefore, in order to effectively reduce the room temperature tack of the toner transfer surface of the film, it is preferable to set the glass transition point of the thermoplastic resin film to 0 ° C. or higher. In the image recording medium of the present invention, since the room temperature tack of the thermoplastic resin film can be lowered and the image recording media can be effectively prevented from sticking to each other, the roll of the image recording medium after storage can be easily unwound. it can.

On the other hand, if the glass transition point of the thermoplastic resin film is too high, the thermal transfer performance of the toner is deteriorated and a clear image cannot be obtained. In addition, the film tends to become brittle, and when an image recording medium is used as a protective film, damage such as cracks easily occurs. From such a viewpoint, the glass transition point of the thermoplastic resin film is 100.
It is below ℃.

In order to more effectively enhance the effects as described above, that is, lowering the room temperature tack, improving the thermal transfer performance, and preventing the film embrittlement, the thermoplastic resin film has a glass transition point of 10 to 10. 90 ° C. is preferable, and 20 to 80 ° C. is particularly preferable. The glass transition point (Tg) of the thermoplastic resin film is measured by preparing a film having a thickness of about 10 μm (usually 8 to 20 μm) as a sample and setting the sample in a DSC (differential scanning calorimeter). . During the measurement, the temperature is raised from -50 to 120 ° C. (first scan), and Tg is determined from the inflection point corresponding to the second-order transition point during the first scan.

The ratio of the toughness resin to the whole resin components constituting the thermoplastic resin film is usually 55% by mass.
That is all. Further, in order to enhance the toughness of the film more effectively, the ratio of the toughness resin to the entire resin component is preferably 65% by mass or more, and particularly preferably 75% by mass or more.

In the image display sheet using the image recording medium of the present invention as a protective film, an adhesive layer for adhering the image-recorded protective film and the sheet base material to each other is provided on both the back surface of the protective film and the surface of the sheet base material. It is preferable to have a pressure-sensitive adhesive layer in close contact with. By doing so, the protective film and the sheet substrate can be bonded to each other at room temperature (usually 20 to 30 ° C.) without heating the sheet substrate itself.

On the back surface of the protective film on which an image has been recorded, the lumps of toner are convex to form irregularities. At the time of adhering the image-recorded protective film and the adhesive layer, the adhesive layer must be deformed (flowed) so as to follow such unevenness, and the protective film and the adhesive layer must be brought into close contact with each other. This is because the poor adhesion between the protective film and the adhesive layer results in the inclusion of bubbles, and the bubbles visible to the observer impair the appearance and visibility of the image. In the image display sheet of the present invention, since it can be produced by a method that does not include a thermocompression bonding operation, a base material that is easily damaged by heat, for example, a wallpaper whose surface is subjected to design treatment such as embossing is used as a sheet base material. ,
The image display sheet can be completed.

The pressure-sensitive adhesive layer is a layer of an adhesive containing a tacky polymer and does not require a heating operation for enhancing the unevenness followability (fluidity) of the adhesive layer. Therefore, it is not necessary to heat the three members, that is, the image-recorded protective film, the adhesive layer, and the sheet base material, by pressure bonding. The pressure sensitive adhesive layer preferably contains a crosslinked tacky polymer. When it contains a crosslinked tacky polymer, compared to the case where it is not crosslinked, even if the image display sheet formed by adhering the protective film and the sheet base material to each other is rolled and stored, The adhesive does not exude from the side part (side part) of the roll, and it is possible to effectively prevent the image display sheets that overlap each other from sticking together. Therefore, the roll of the image display sheet after storage can be easily unwound. The adhesive layer may have two pressure-sensitive adhesive layers as long as the thickness of the entire image display sheet becomes unnecessarily large and does not impair the effects of the present invention. It can also have a pressure-adhesive layer and a second pressure-sensitive adhesive layer that adheres to the sheet substrate.

(Image Display Sheet) A preferred example of the image display sheet of the present invention will be described with reference to FIG. Figure 1
Shows schematically the image display sheet of this example. The image display sheet (100) includes the image recording medium of the present invention as a light-transmitting protective film (1). In the illustrated example, the image recording medium is composed of a single layer thermoplastic resin film. The protective film (1) has a front surface (11) and a back surface (12), and receives the toner (2) on the back surface (12). The toner (2) forms an image visible through the protective film (1) from the outermost surface of the protective film. In the illustrated example, the surface (11) is covered with the liner (5), but the image display sheet (100)
When used, it is peeled and removed. Therefore, during use, the surface (11) of the protective film is the outermost surface in contact with the outside.

The scratch resistance and antifouling property of the surface (11) of the protective film are preferably enhanced as much as possible. In order to effectively improve the scratch resistance and the antifouling property, it is preferable to adhere a protective layer made of the cured resin composition to the surface of the thermoplastic resin film. That is, an image recording medium (protective film) is formed from a laminate including a thermoplastic resin film and a protective layer which is adhered to the thermoplastic resin film with the back surface thereof facing the thermoplastic resin film. Is preferred. In this case, the surface of the protective layer facing the back surface is the outermost surface of the protective film. The protective layer can be formed from a curable composition containing a resin such as polyurethane or urethane acrylate. The thickness of the protective layer is usually 0.5 to 20 μm, preferably 1 to 10 μm.

The sheet base material (4) has a front surface (41) arranged so as to face the back surface (12) of the protective film, and a back surface (42) facing the front surface (41), and has an adhesive layer (3). )) To the protective film (1).
The adhesive layer (3) is a pressure-sensitive adhesive layer containing a tacky polymer. Examples of such a pressure-sensitive adhesive layer include a pressure-sensitive adhesive film in the form of a single layer film containing an adhesive polymer, a first pressure-sensitive adhesive layer that adheres to a protective film, and a sheet substrate. A double-sided adhesive sheet having a second pressure-sensitive adhesive layer can be preferably used. Sheet substrate surface (4
In 1), the finished image display sheet (100) can be subjected to a designing process in order to enhance the appearance designing property, thereby forming irregularities.

As described above, the sheet base material (4) and the protective film (1) are pressure-bonded without being heated when they are bonded. Further, when the adhesive layer (3) is fixed to the sheet base material (4) before the protective film (1) is adhered, both are pressure-bonded without heating. Therefore, the adhesive layer (3) is in close contact with the surface of the sheet base material (41) without impairing the design of the surface of the sheet base material (41). In the illustrated example, the adhesive layer (3) has high transparency, and an observer can satisfactorily visually recognize the design irregularities on the sheet base material surface (41) through the protective film (1) and the adhesive layer (3).

The back surface of the protective film on which the image is formed (1
The toner (2) is convex on the surface 2) to form irregularities. Since the adhesive layer (3) has pressure-sensitive adhesiveness, it is deformed (flows) so as to follow the irregularities without being heated, and the back surface (12) of the protective film and the adhesive layer (3) are in close contact with each other.

The liner (5) usually comprises a support and a release layer (not shown) in contact with the protective film surface (11). The support is usually a polymer sheet or polymer film. As the polymer for the support, for example, synthetic polymers such as polyester, polyvinyl chloride, ionomer, acrylic polymer, polyolefin and polyurethane can be used.

The release layer is preferably formed from a coating film of a release agent composition containing a silicone polymer. The silicone-based polymer is usually a modified silicone. Incidentally, the release layer, as an additive, for example, a heat stabilizer,
An ultraviolet absorber, an antistatic agent, an antioxidant, a dye, a pigment and the like can also be added. As an example of a commercial product of the liner that can be used in the present invention, P with a release layer manufactured by Teijin Ltd.
Examples thereof include ET film (trademark) Tetron film and PP film (trademark) Telefan BO with release layer manufactured by Toray Industries, Inc.

(Image Recording Medium) The image recording medium of the present invention has, as the toner transfer layer, the thermoplastic resin film containing the resin component containing the tough resin as described above. Such a thermoplastic resin film has high toughness and, for example, does not crack even in the following bending test. First, a laminate formed by adhering a wallpaper and an image recording medium via a pressure-sensitive adhesive layer is cut to have a width of about 25.
A tape-shaped test piece having a length of 100 mm and a length of 100 mm is prepared. The wallpaper used here is usually the same as that used when actually forming the image display sheet, but the thickness is 20
Other wallpaper may be used as long as it is a wallpaper of up to 1,000 μm. The pressure-sensitive adhesive layer used here is usually the same as that used when actually forming the image display sheet, but any other pressure-sensitive adhesive layer having a thickness of 20 to 200 μm may be used. good. The test piece is folded 180 degrees along the length direction around the substantially central portion of the test piece, and the test piece is folded in two so that the surfaces of the test piece face each other. Then, the folded test piece is opened again, and this time the test piece is folded in two so that the back surfaces of the test pieces face each other. This is repeated 5 times, and a 180-degree bending operation is performed 10 times. It is evaluated that the toughness of such a thermoplastic resin film is good when cracks do not occur in the thermoplastic resin film even after 10 times of 180-degree bending operation.

Polyurethane used as a tough resin is a polymer obtained by polymerizing a raw material containing a polyol and a diisocyanate. The raw materials include, as a chain extender, neopentyl glycol, ethylene glycol,
Short chain diols such as propylene glycol may be added. Examples of the diisocyanate include isophorone diisocyanate (IPDI), diphenylmethane diisocyanate (MDI), hydrogenated MDI, 1,6-hexanediol diisocyanate, and tolylene diisocyanate (TDI).
DI), tetramethylxylylene diisocyanate (T
MXDI) can be used. The raw material may contain one or more polyols and may also contain one or more diisocyanates.

The first suitable polyurethane is a polyurethane obtained by polymerizing a raw material containing an acrylic polyol as a polyol. This is because the breaking strength and breaking elongation of the thermoplastic resin film can be enhanced in a well-balanced manner, and breakage of the thermoplastic resin film can be prevented particularly effectively. Further, since acrylic polyol has excellent weather resistance, polyurethane formed from acrylic polyol can effectively prevent deterioration or coloring of the thermoplastic resin film due to environmental factors such as ultraviolet rays and heat. Since the toner image is viewed through the thermoplastic film, tinting of the thermoplastic film causes discoloration of the image. Therefore, such a thermoplastic resin film which is difficult to be colored is advantageous as a toner transfer layer of an image recording medium.

The acrylic polyol is a polymer or oligomer which is formed by polymerizing a (meth) acrylic monomer mixture and has a hydroxyl group in the molecule. The (meth) acrylic monomer mixture is usually a hydroxy (meth) acrylate, an alkylene glycol diacrylate, a (meth) acrylate having an alkyl group having 1 to 10 carbon atoms, and other copolymerizable monomers (acrylic acid,
Methacrylic acid, etc.). Acrylic polyols can be formed from such monomer mixtures using conventional polymerization methods, such as solution polymerization.

The mixing ratio of each monomer is appropriately determined so that the glass transition point and other physical properties of the thermoplastic resin film containing polyurethane formed from acrylic polyol are in the optimum range. The physical properties other than the glass transition point of the thermoplastic resin film include, for example, the Vicat softening point of the thermoplastic resin film. The Vicat softening point is usually 30 to 95 ° C, preferably 40 to 93 ° C.
If the Vicat softening point is too high, thermal transfer of toner may be difficult. On the other hand, if the Vicat softening point is too low,
The mechanical strength of the protective film is lowered, and especially when the protective film is composed of a single layer of the thermoplastic resin film, the scratch resistance of the protective film may be lowered. The Vicat softening point is a softening temperature measured by a method in accordance with Japanese Industrial Standard JIS-K7206, and a test is performed while applying a predetermined load to a needle-shaped indenter standing vertically on a test piece (thermoplastic resin film). It is the temperature when the temperature of the piece is raised at a constant rate and the indenter penetrates the test piece by 1 mm.

The second preferred polyurethane is a polyolefin having an alkylene skeleton having 5 or 6 carbon atoms in the main chain.
It is a polyurethane having a unit in the molecule. Whether the number of carbon atoms in the main chain is 4 or less or 7 or more, the effect of preventing damage to the thermoplastic resin film as described above tends to decrease. Although the reason for this is not clear, when the number of carbon atoms in the main chain is 4 or less, the elongation at break is reduced and the toughness is reduced. On the contrary, when the number of carbon atoms in the main chain is 7 or more, the breaking strength is reduced. It is thought that the toughness decreases. If the number of carbon atoms in the main chain is 4 or less, thermal transfer of toner tends to be difficult.

As the polyol, polyester polyol or polycarbonate polyol is preferable. This is because damage to the thermoplastic resin film can be prevented particularly effectively. Particularly preferred is a polycarbonate polyol. This is because polycarbonate polyol has excellent weather resistance and moisture resistance as compared with polyester polyol. If the thermoplastic resin film has excellent moisture resistance,
It is possible to effectively prevent the image display sheet from absorbing humidity and curling. Effectively preventing such curling facilitates the work of adhering the image display sheet to the wall surface as wallpaper.

In the second preferred polyurethane, the type (chemical structure) of the diisocyanate contained in the raw material and, if a short chain diol is contained, the ratio of the short chain diol and the polyol is appropriately determined to determine the physical properties of the polyurethane (glass Transition point,
The complex dynamic viscosity and the Vicat softening point) can be controlled within the above range. In addition, it is preferable that the component ratio of such a raw material is determined so that the elongation at break when a thermoplastic resin film having a thickness of 50 μm or more is used as a sample is 100% or more. The elongation at break is about 25% at room temperature (about 25 ° C) and normal humidity (about 50% R).
It is a value obtained by measuring with a tensile tester at a tensile speed of 300 mm / min under the environment of H). The molecular weight of the first and second polyurethanes is not particularly limited as long as it has sufficient toughness, but is usually 20,000 to 1.0.
It has a weight average molecular weight of 0,000.

On the other hand, when polyurethane is used, a hard resin having a glass transition point in the range of 60 to 100 ° C.
The use of it in combination with esin) is advantageous for increasing the toughness of the thermoplastic resin film. Useful for such purpose is a combination of polyurethane and phenoxy resin. In such a mixture, polyurethane is preferably contained in a larger amount than the phenoxy resin. This is because it is possible to effectively prevent a decrease in the breaking strength of the thermoplastic resin film while increasing the breaking elongation and effectively prevent the breaking of the thermoplastic resin film. In addition, forming a thermoplastic resin film by mixing a hard resin and polyurethane as described above has high room temperature tack and low toughness (for example, a glass transition point of which is lower than 0 ° C.). Is also advantageous in reducing the tack of the thermoplastic resin film and enhancing the toughness.

A thermoplastic resin film containing an ethylene-acrylic acid copolymer as a tough resin has excellent toughness and transparency. It is considered that the ethylene-acrylic acid copolymer imparts toughness to the film because the carboxyl group derived from acrylic acid of the molecule forms an effective hydrogen bond between adjacent polymer molecules.

With respect to the ratio of ethylene units to acrylic acid units in the ethylene-acrylic acid copolymer molecule, the above-mentioned physical properties (glass transition point, complex dynamic viscosity and Vicat softening point) are controlled within the above range. Is decided. Also, the thickness is 5
It is preferable to determine the elongation at break when the thermoplastic resin film of 0 μm or more is used as a sample to be 100% or more. The breaking elongation is a value obtained by measuring a tape-shaped sample having a width of 25 mm at a tensile speed of 300 mm / min by a tensile tester under an environment of normal temperature (about 25 ° C.) and normal humidity (about 50% RH). Is. If the amount of acrylic acid units is too large, the elongation at break tends to decrease, and if too small, the transparency tends to decrease. The content of acrylic acid in the ethylene-acrylic acid copolymer is usually 3 to 20% by mass. The molecular weight of the ethylene-acrylic acid copolymer is
It is not particularly limited as long as it has sufficient toughness, but usually 2
It has a weight average molecular weight of 10,000 to 1,000,000.

When the phenoxy resin is used, the breaking strength of the thermoplastic resin film is high and the dynamic bending resistance is high. This is mainly due to having a repeating unit derived from bisphenol in the molecule. Therefore, breakage of the thermoplastic resin film can be effectively prevented. As the phenoxy resin, those usually used for paints can be used. As a specific example of the commercially available product, "Product number: manufactured by Tohto Kasei Co., Ltd."
"YP50S", "Trademark: Paphe" of Phenoxy Specialties
n PKHH ”and the like. The molecular weight of the phenoxy resin is not particularly limited as long as it has sufficient toughness, but usually has a weight average molecular weight of 20,000 to 1,000,000.

The thermoplastic resin film may contain a thermoplastic resin other than the tough resin so long as the effects of the present invention are not impaired. Examples of other thermoplastic resins include polyester resins, acrylic resins, vinyl chloride resins, vinyl acetate resins, and polyvinylidene fluoride resins.

The image recording medium can be manufactured, for example, as follows. The thermoplastic resin film can be formed by a usual film forming method. For example, it can be formed by applying a coating material containing a resin component on the release surface of the liner and solidifying it. A usual coater, for example, a bar coater, a knife coater, a roll coater, a die coater or the like can be used for the coating device. The solidifying operation is a drying operation in the case of a coating material containing a volatile solvent or an operation of cooling the molten resin component. Further, it can be formed by a melt extrusion molding method.

The protective film containing the protective layer and the thermoplastic resin film can be produced, for example, as follows. First, a protective layer is formed on a liner, and a coating material containing a resin component of a thermoplastic resin film is applied and solidified on the protective layer with a liner (that is, on the back surface of the protective layer). This makes it possible to manufacture an image recording medium including a laminate including a protective layer and a thermoplastic resin film. Also,
Another layer such as a primer layer or an adhesive layer may be arranged between the protective layer and the thermoplastic resin film.

As described above, it is preferable that the glass transition point of the thermoplastic resin film is set to 0 ° C. or higher and the room temperature tack is lowered. The degree of room temperature tack is not particularly limited as long as it can prevent sticking of the image recording media, but is usually 25 ° C.
The probe tack measured in 1 is less than 1N, preferably 0.5
It is less than N, particularly preferably less than 0.1N. If the probe tack is high, it may not be possible to effectively prevent the image recording media from sticking to each other, and the roll of the image recording media after storage may not be easily unwound. The probe tack is measured by a method based on ASTM D2979.

The thickness of the entire image recording medium is usually 1 to 50.
μm, preferably 5 to 40 μm. If the thickness is too thin, the mechanical strength will decrease and the scratch resistance may decrease when used as a protective film. On the other hand, if it is too thick, the thermoplastic resin film may not be effectively prevented from being damaged when the image display sheet containing the image recording medium is folded and stored and transported.

The image recording medium has a light transmitting property as a whole. The light transmittance is usually 60% or more, preferably 70% or more, and particularly preferably 80% or more. The "light transmittance" in this specification means the total light transmittance measured using the light of 550 nm using the spectrophotometer or the color meter also equipped with the function of a photometer.

(Sheet Substrate) The sheet substrate used in the present invention can be formed from paper, non-woven fabric, woven fabric or polymer sheet. The polymer sheet may be a foam containing a plurality of fine pores inside. The polymer sheet can be formed using a composition containing a polymer such as acrylic resin, polyester, epoxy resin, polyurethane, polyvinyl chloride, polyamide, or polyolefin. The sheet base material may include a pigment or a dye and may be colored. Further, a design may be printed on the surface of the sheet base material as long as the effect of the present invention is not impaired. Furthermore, unless impairing the effects of the present invention, the surface of the sheet substrate, flameproofing,
You may give an antistatic process.

When the image display sheet of the present invention is used as a wallpaper containing an image, the surface of the sheet base material is preferably subjected to a designing process such as embossing as described above.
As the design processing, for example, irregular irregularities having a relatively large surface roughness are formed on the surface to give a non-glossy appearance, or a predetermined pattern is formed in accordance with the design or pattern included in the image of the protective film. By forming irregularities in the shape, it is possible to give a realistic appearance and a three-dimensional effect. More specifically, for example, wood tone, grain tone, stone tone, Japanese paper tone, cloth tone, hairline,
A three-dimensional pattern having a suede-like design can be provided.

The roughness of the surface of the sheet substrate that has been subjected to the design treatment is not particularly limited, but usually, it is measured by a surface roughness measuring device.
Ra measured under the condition that the measurement length is 0.4 mm is 3 to 25.
It is 0 μm or more. In the image display sheet according to the present invention,
Projections (or depressions) with relatively large irregularities on the surface of the sheet base material
Partial (eg, peak-to-valley is 15
Even if it is 0 μm or more), the protective film with image recording follows the irregularities on the surface of the sheet base material and is effective in damaging the thermoplastic resin film such as cracking when the protective film is adhered to the surface of the sheet base material. Can be prevented. The thickness of the sheet base material is usually 10 to 1,000 μm, and preferably 20 to 800 μm.

(Adhesive Layer) The pressure-sensitive adhesive layer of the adhesive layer can be formed from, for example, a coating film of an adhesive containing a tacky polymer. A preferred adhesive contains a tacky polymer and a crosslinking agent that crosslinks the tacky polymer. The components and physical properties of the adhesive are plastically deformed following the completion of adhesion of the protective film and the sheet base material, followed by the unevenness of the toner on the back surface of the protective film, and the design unevenness formed on the surface of the sheet base material, and the protective film and It is selected so as to adhere to the sheet base material.

In the present specification, the adhesive polymer (self-a
A dherent polymer) is a polymer that exhibits tackiness at room temperature (about 25 ° C.). As the adhesive polymer, acrylic polymer, polyurethane, polyolefin, polyester and the like can be used. One example of the synthesis of the tacky polymer will be described by taking an acrylic polymer as an example. First, as the first monomer, a polar (meth) acrylic monomer such as an acrylic unsaturated acid (for example, acrylic acid, methacrylic acid, itaconic acid, maleic acid, etc.) or acrylonitrile is prepared. The first monomer and the acrylic monomer as the second monomer are mixed to prepare a monomer mixture. As the second monomer, an alkyl acrylate, for example, isooctyl acrylate, butyl acrylate, 2-methylbutyl acrylate, 2-ethylhexyl acrylate, isononyl acrylate or the like can be used. The monomer mixture thus prepared is used to synthesize an adhesive polymer having a predetermined molecular weight by using a usual polymerization method such as solution polymerization, emulsion polymerization or bulk polymerization.

When a cross-linking agent is used to cross-link the adhesive polymer, the addition amount of the cross-linking agent depends on the kind of the cross-linking agent, but is usually 0.0 per 100 parts by weight of the adhesive polymer.
It is 2 to 2 parts by mass, preferably 0.03 to 1 part by mass. The crosslinking agent is an isocyanate compound, a melamine compound, a poly (meth) acrylate compound, an epoxy compound, an amide compound, a bisamide compound [isophthaloylbis (2-
Bisaziridine derivative of dibasic acid such as methylaziridine) and the like can be used.

The total thickness of the adhesive layer is preferably 10 to 20.
0 μm, particularly preferably 20 to 100 μm. Also,
The pressure-sensitive adhesive layer may contain additives such as a tackifier, a tacky polymer microsphere, a crystalline polymer, an inorganic powder and an ultraviolet absorber as long as the effect of the present invention is not impaired.

(Image formation) An image is formed by transferring toner to the back surface of the protective film using a usual printing method such as an electrostatic printing method. In the electrostatic printing method, an image is directly printed on the back surface of the protective film, and a transfer method in which the image is temporarily printed on the temporary carrier and then the image is transferred to the protective film. There is. In the latter transfer method, an image is formed on a temporary carrier called transfer medium, and the image is heated on the back surface of the protective film,
Transfer by pressure to complete the image-recorded protective film.

The toner forming an image contains a binder resin and a pigment dispersed in the binder resin. The binder resin is formed, for example, of one type selected from the group consisting of vinyl chloride-acetate-based copolymers, acrylic resins and polyester resins, or a mixture containing two or more types. For details of such electrostatic printing method, see, for example, Japanese Patent Application Laid-Open No. 4-216562 and Japanese Patent Publication No. 11-513.
No. 818 and the like.

[0059]

(Example) Using an electrostatic printing system manufactured by 1.3M, trademark Scotchprint product number 9512, on a transfer medium manufactured by 3M, product number 8601J,
A digital image for transfer was formed using a dedicated toner. This image-recorded transfer medium was wound into a roll to prepare a media roll.

2. Next, a laminator manufactured by 3M Co., Ltd., a brand Orca III media roll unwinding shaft as described above 1. Of the image recording medium whose surface is coated with a liner is attached to the unwinding shaft of the transfer target roll.
A roll of a pressure-sensitive adhesive layer whose front and back surfaces were protected by two release liners was attached to the unwinding roll of the overlaminate film roll, and preparations were completed for completing the image-recorded medium with the adhesive layer. In this medium with an adhesive layer, the toner image is recorded on the back surface of the image recording medium by contacting the toner, and the pressure-sensitive adhesive layer is adhered on the toner image and covers the back surface of the image recording medium. The operating conditions of the laminator when the image is transferred to the image recording medium are shown below. * Image transfer conditions-Upper roll temperature = 130 ° C-Lower roll temperature = 50 ° C-Web transport speed = 70 cm / min-Pressure = approx. 480 kPa (70 psi)

3. The image recording medium was manufactured as follows. First, polyurethane (U) and phenoxy resin (Ph) were mixed in toluene at a ratio of 7: 3 (U: Ph, mass ratio) to prepare a toluene solution. Polyurethane was obtained by polymerizing a raw material containing 1,6-hexanediol carbonate polyol and hexamethylene diisocyanate. Phenoxy resin is Ph
It was "Trademark: Paphen PKHH" of enoxy Specialties. This solution was used as a liner (50 μm with release treatment layer)
On the polyester film) and the thickness after drying is 35μ
Then, the image recording medium of this example composed of a transparent thermoplastic resin film was prepared by coating and drying so as to have a thickness of m. The Tg of the image recording medium (thermoplastic resin film) of this example is
It was 24 ° C. The image recording medium of this example functions as a protective film capable of electrostatic printing.

4. The pressure-sensitive adhesive layer was a coating film of a paint containing a tacky polymer. This adhesive polymer is made of isooctyl acrylate (IOA), methyl acrylate (M
A), a monomer mixture consisting of acrylic acid (AA) (IOA:
MA: AA = 70: 22.5: 7.5, mass ratio) was obtained by solution polymerization. This sticky polymer 100
Bisamide (crosslinking agent) in an ethyl acetate solution containing parts by mass
The pressure-sensitive adhesive layer was formed by applying the coating composition containing 0.19 parts by mass on one of the two release liners and drying it. The drying condition was 95 ° C. for 5 minutes. After forming the pressure-sensitive adhesive layer, the exposed surface of the adhesive layer was covered with the other release liner to prepare the pressure-sensitive adhesive layer roll. The thickness of the pressure sensitive adhesive film after drying was 30 μm.

5. The above 2. The image-recorded medium with the adhesive layer prepared in 1. and the sheet base material are laminated using a laminator, and the image-recorded medium and the sheet base material are pressure-bonded via the pressure-sensitive adhesive layer to display the image of this example. Got a roll of sheets. In this image display sheet, the surface of the protective film (image recording medium) was still covered with the polyester liner. The pressure-bonding conditions for the image-recorded image-recording medium and the sheet base material are shown below. * Pressing condition between image recording medium and sheet substrate-Pressing temperature = 25 ° C-Pressure = about 480 kPa (70 psi) -Web transport speed = 70 cm / min

6. The sheet base material was wallpaper. This wallpaper is a foamed wallpaper (Takashima Co., Ltd. product number: TO-3)
Then, an adhesive layer containing an acrylic adhesive polymer was formed on the foamed surface (surface). The thickness of the foamed wallpaper is 60 (maximum thickness) measured at the highest convex part.
The maximum value of the peak-to-valley of the unevenness of the foamed surface was 0 μm and 200 μm.

The roll of the image recording medium (protective film) used in this example was stored at about 25 ° C. for 2 months, but there was no sticking of the overlapping films, and the roll after storage could be easily unwound. The image recording medium having a desired length could be taken out. Further, the roll of the image display sheet of this example was stored at about 25 ° C. for 2 months, but no exudation of the adhesive in the adhesive layer was observed, and the roll after storage could be easily unwound, The image display sheet of length could be taken out.

After taking out in this way, in the image display sheet from which the liner covering the protective film was removed, the image observed through the protective film was clear. In the image display sheet of this example, the protective film has sufficient followability to the unevenness of the surface of the sheet substrate, and the protective film did not crack. In addition, it was confirmed from the appearance observation of the image display sheet that the design irregularities on the wallpaper surface were reproduced.
In addition, a 180-degree bending test (10
No cracks were formed in the protective film.

The image display sheet of this example can be used as a wallpaper with a digitally printed image by applying a glue for wallpaper only on the back surface of the sheet base material, and has a scratch resistance of a sufficient level for its use. Was confirmed.

(Example 2) An image display sheet of this example was obtained in the same manner as in Example 1 except that the following image recording medium was used. The image recording medium (image-recordable protective film) used in this example was prepared as follows. First, a coating solution containing a thermosetting polyurethane to be a protective layer was applied onto the liner used in Example 1 so that the thickness after drying was 3 μm, and dried to obtain a transparent thermosetting film. Formed. As a result, a protective layer made of a thermosetting film in which the surface closely attached to the liner (the surface which becomes the outermost surface in the completed protective film after the liner was peeled off) and the back surface facing the surface was exposed was formed.

The coating solution used here was 60 parts by mass of a main solution (trade name: Bellclean No. 5000SC, manufactured by NOF CORPORATION) containing a thermosetting polyurethane, and a first isocyanate-based curing agent ( 16 parts by mass of Nippon Oil & Fats Co., Ltd., trademark: Bellclean curing agent, and a second isocyanate-based curing agent (Nippon Oil & Fats Co., Ltd., trademark: Primac curing agent PS)
No. 201) 24 parts by mass were mixed and prepared. Since the main liquid contained a so-called hydrophilicity-imparting agent that imparts hydrophilicity to the coating film surface, in addition to polyurethane, the surface of the protective layer had self-cleaning property due to hydrophilicity. The protective layer having such a self-cleaning property is particularly excellent in antifouling property.

On the protective layer with liner, Example 1
Similarly to the above, a solution containing polyurethane and a phenoxy resin was applied and dried to form a thermoplastic resin film in close contact with the protective layer, to obtain an image recording medium of this example. This image recording medium was composed of a laminate of a thermoplastic resin film as a toner transfer layer and a protective layer, and functioned as an electrostatically printable protective film. When the unrolling of the image recording medium roll and the image display sheet roll after storage was evaluated in the same manner as in Example 1, both of the rolls could be easily unwound.

In the image display sheet of this example, the image observed through the protective film was clear. In the image display sheet of this example, the protective film has sufficient followability to the unevenness of the surface of the sheet substrate, and the protective film did not crack. In addition, it was confirmed from the appearance observation of the image display sheet that the design irregularities on the wallpaper surface were reproduced. Also,
When a 180-degree bending test (10 times) was performed according to the method described above, no crack was generated in the protective film.

The image display sheet of this example can be used as a wallpaper with a digitally printed image by applying a glue for wallpaper on the back surface of the sheet base material, and has a scratch resistance of a sufficient level for its use. Was confirmed.

Comparative Example 1 Example 1 was repeated except that a polymethylmethacrylate-containing thermoplastic resin film (thickness: 15 μm) formed from Raloh &Haas's Paraloid A-21 was used as the protective film. An image display sheet of this example was obtained in the same manner as in. The Tg of the thermoplastic resin film used in this example was 105 ° C. The image on the image display sheet of this example was unclear. In addition, the ability of the protective film to follow the unevenness of the surface of the sheet base material is insufficient,
The protective film was cracked. Moreover, when a 180-degree bending test was performed, cracks were generated in the protective film.

(Example 3) An image display sheet of this example was obtained in the same manner as in Example 1 except that the thermoplastic resin film was made of only the above-mentioned phenoxy resin. The image recording medium (thermoplastic resin film) of this example had a Tg of 72 ° C. When the unwinding of the image recording medium roll after storage was evaluated in the same manner as in Example 1, it could be easily unwound.

In the image display sheet of this example, the image observed through the protective film was clear. In the image display sheet of this example, the protective film has sufficient followability to the unevenness of the surface of the sheet substrate, and the protective film did not crack. In addition, it was confirmed from the appearance observation of the image display sheet that the design irregularities on the wallpaper surface were reproduced. Also,
When a 180-degree bending test (10 times) was performed according to the method described above, no crack was generated in the protective film.

(Example 4) An image display sheet of this example was obtained in the same manner as in Example 1 except that the thermoplastic resin film was made only from the above-mentioned polyurethane. The Tg of the image recording medium (thermoplastic resin film) of this example was 34 ° C. When the unwinding of the image recording medium roll after storage was evaluated in the same manner as in Example 1, it could be easily unwound.

In the image display sheet of this example, the image observed through the protective film was clear. In the image display sheet of this example, the protective film has sufficient followability to the unevenness of the surface of the sheet substrate, and the protective film did not crack. In addition, it was confirmed from the appearance observation of the image display sheet that the design irregularities on the wallpaper surface were reproduced. Also,
When a 180-degree bending test (10 times) was performed according to the method described above, no crack was generated in the protective film.

(Example 5) This example was carried out in the same manner as in Example 1 except that the thermoplastic resin film was made only from polyurethane produced by polymerizing polycaprolactone, MDI and neopentyl glycol as raw materials. The image display sheet of The Tg of the image recording medium (thermoplastic resin film) of this example was 0 ° C. When the unwinding of the image recording medium roll after storage was evaluated in the same manner as in Example 1, stick slip was occasionally seen, but the unwinding could be easily performed.

In the image display sheet of this example, the image observed through the protective film was clear. In the image display sheet of this example, the protective film has sufficient followability to the unevenness of the surface of the sheet substrate, and the protective film did not crack. In addition, it was confirmed from the appearance observation of the image display sheet that the design irregularities on the wallpaper surface were reproduced. Also,
When a 180-degree bending test (10 times) was performed according to the method described above, no crack was generated in the protective film.

(Example 6) Same as Example 1 except that polyurethane polymerized in the same manner as in Example 5 was used except that the amount of neopentyl glycol relative to polycaprolactone was increased to increase Tg. An image display sheet of this example was obtained. The Tg of the image recording medium (thermoplastic resin film) of this example was 30 ° C. When the unwinding of the image recording medium roll after storage was evaluated in the same manner as in Example 1, it could be easily unwound.

In the image display sheet of this example, the image observed through the protective film was clear. In the image display sheet of this example, the protective film has sufficient followability to the unevenness of the surface of the sheet substrate, and the protective film did not crack. In addition, it was confirmed from the appearance observation of the image display sheet that the design irregularities on the wallpaper surface were reproduced. Also,
When a 180-degree bending test (10 times) was performed according to the method described above, no crack was generated in the protective film.

Example 7 An image display sheet of this example was obtained in the same manner as in Example 1 except that the thermoplastic resin film was made of a tough resin made of an ethylene-acrylic acid copolymer. The Tg of the thermoplastic resin film is 75.
It was ℃. When the unwinding of the image recording medium roll after storage was evaluated in the same manner as in Example 1, it could be easily unwound. In the image display sheet of this example,
The image observed through the protective film was clear.
In the image display sheet of this example, the protective film has sufficient followability to the unevenness of the surface of the sheet substrate, and the protective film did not crack. In addition, it was confirmed from the appearance observation of the image display sheet that the design irregularities on the wallpaper surface were reproduced. Further, when a 180-degree bending test (10 times) was performed according to the method described above, no crack was generated in the protective film.

Comparative Example 2 A thermoplastic resin film was prepared from a polyurethane obtained by polymerizing a raw material containing a polyester polyol consisting of adipic acid and 1,4-butanediol, tolylene diisocyanate and propylene glycol. An image display sheet of this example was obtained in the same manner as in Example 1 except that the image was produced. T of thermoplastic resin film
g was -50 ° C.

When the unwinding of the image recording medium roll after storage was evaluated in the same manner as in Example 1, it was difficult to unwind the roll due to sticking of the image recording media to each other.

[Brief description of drawings]

FIG. 1 is a sectional view of an example of an image display sheet of the present invention.

[Explanation of symbols]

100: image display sheet, 1: protective film, 11: front surface, 12: back surface, 2: toner, 3: adhesive layer, 4: sheet base material, 41: base material front surface, 42: base material back surface, 5: liner

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Hiroshi Tsuji             5500 Wakagi, Higashine, Yamagata Prefecture Yamagata pickpocket             ー M Co., Ltd. F term (reference) 3B005 EB01 EB09 FA01 FB40 FC01Z                       FC05Z FC08Z FC09Z GA18                 4F100 AK51A AK54A AK70A AR00B                       AT00A AT00C BA03 BA07                       CB05 EC04 GB07 HB31 JA05A                       JB16A JK14 JL05 JN01B                       YY00A

Claims (5)

[Claims] 1. A thermoplastic resin film having a back surface, which is a toner transfer surface on which toner for forming an image is thermally transferred, and a surface facing the back surface, and (i) a substantial part of the thermoplastic resin film. A single layer, the surface of the thermoplastic resin film is the outermost surface, or (ii) the thermoplastic resin film, and a protective layer arranged with the back surface facing the surface of the thermoplastic resin film And an image recording medium having a light-transmitting property that allows the image to be visually recognized from the outermost surface in the state where the image is formed, in which the front surface of the protective layer facing the back surface is the outermost surface. In the above, the thermoplastic resin film is a resin containing at least one tough resin selected from the group consisting of polyurethane, ethylene-acrylic acid copolymer and phenoxy resin. Comprises a minute, and a glass transition point obtained is 0 to 100 ° C. using a differential scanning calorimeter of the thermoplastic resin film, the image recording medium. 2. The image recording medium according to claim 1, wherein the tough resin is a polyurethane having in its molecule a polyol unit having an alkylene skeleton whose main chain has 5 or 6 carbon atoms. 3. The polyol unit having an alkylene skeleton comprises at least one polyol unit selected from the group consisting of a polyol unit derived from a polyester polyol and a polyol unit derived from a polycarbonate polyol. 2. The image recording medium according to 2. 4. The image recording medium according to claim 1, wherein the toughness resin is a mixture containing polyurethane and a phenoxy resin. 5. A protective film comprising the image recording medium of claim 1 and having a back surface which is the toner transfer surface and an outermost surface facing the back surface, and (b) a transfer to the back surface of the protective film. And an image formed from the above-mentioned toner and visible from the outermost surface, and (c) a front surface arranged facing the back surface of the protective film, and a back surface facing the front surface, and adhered to the protective film. A sheet base material, and (d) a protective film on which the image is formed and an adhesive layer that adheres the sheet base material to each other, wherein the adhesive layer includes the back surface of the protective film on which the image is formed and the sheet. An image display sheet having a pressure-sensitive adhesive layer in close contact with both the surface of a base material.