JP2010066744A - Transparent multi-layer sheet for display plate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a transparent multi-layer sheet for a display plate, which has excellent adhesiveness between resin layers and in which curvature is hardly caused even when environmental humidity changes, and in which practically sufficient stiffness is obtained by forming hard crosslink film on its surface. <P>SOLUTION: The transparent multi-layer sheet for display plates includes a methacrylic resin layer on at least one side of MMA-styrene copolymer resin sheet. The methyl methacrylate (MMA) content of methacrylic resin in a methacrylic resin layer is 85 mol% or more. A hard coat layer is included on at least one side of surfaces of the methacrylic resin layer. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a transparent resin laminate, and specifically to a transparent multilayer sheet for a display face plate.

  As the transparent sheet for the display face plate, a transparent thermoplastic resin sheet is used, and a methacrylic resin has been mainly used conventionally (see, for example, Patent Document 1). Moreover, in order to prevent the surface from being damaged, it has been generally performed to form a hard layer (hard coat layer) by coating or the like (see, for example, Patent Document 1).

  In the case of methacrylic resin, which is a material of the face plate that has been used conventionally, its elastic modulus is high, so it is possible to obtain practically sufficient hardness by forming a hard cross-linked film on its surface, but it is hygroscopic Therefore, when the humidity of the environment changes, warping is likely to occur.

  On the other hand, when a MMA / styrene copolymer resin sheet is used as the material for the face plate, it has a low hygroscopic property, so it does not easily warp even when environmental humidity changes. In such a case, the problem is that the hardness is insufficient as compared with the case where a hard crosslinked film is formed on the surface of the methacrylic resin.

JP 2004-299199 A Japanese Patent Publication No.62-41241

  The present invention has good adhesion between resin layers, hardly warps even when environmental humidity changes occur, and obtains a practically sufficient hardness by forming a hard cross-linked film on the surface. An object of the present invention is to provide a transparent multilayer sheet for a display face plate.

  As a result of intensive studies to solve the problems of the prior art, the present inventor obtained by sequentially laminating a methacrylic resin layer and a hard coat layer on at least one surface of the MMA / styrene copolymer resin base material. The resulting resin laminate has good adhesion between the resin layers, is less likely to warp even when environmental humidity changes, and has a practically sufficient hardness by forming a hard crosslinked film on its surface Found that you can get. The inventor has completed the present invention by further study.

That is, this invention provides the following transparent multilayer sheet for display faceplates, and its manufacturing method.
Item 1. The MMA / styrene copolymer resin sheet has a methacrylic resin layer on at least one surface, the methacrylic resin layer has a methyl methacrylate (MMA) content of 85 mol% or more, and the surface of the methacrylic resin layer. A transparent multilayer sheet for a display faceplate having a hard coat layer on at least one of the above.
Item 2. Item 2. The transparent multilayer sheet for a display faceplate according to Item 1, which has a methacrylic resin layer on both surfaces of the MMA / styrene copolymer resin sheet.
Item 3. Item 3. The transparent multilayer sheet for a display faceplate according to Item 2, wherein the MMA / styrene copolymer resin sheet has hard coat layers on both surfaces of the methacrylic resin layers on both sides.
Item 4. Item 4. The transparent multilayer sheet for display faceplate according to any one of Items 1 to 3, wherein the methacrylic resin layer has a thickness of 30 μm or more.
Item 5. Item 5. The transparent multilayer sheet for display faceplate according to any one of Items 1 to 4, wherein the thickness of the methacrylic resin layer is within 20% of the thickness of the entire multilayer sheet.
Item 6. Item 6. The transparent multilayer sheet for display faceplate according to any one of Items 1 to 5, wherein the thickness of the hard coat layer is 3 to 12 μm.
Item 7. Item 7. The transparent multilayer sheet for display faceplate according to any one of Items 1 to 6, wherein the hard coat layer is cured by ultraviolet rays.

  Hereinafter, the present invention will be described in detail.

  The transparent multilayer sheet for a display faceplate of the present invention is a resin laminate obtained by sequentially laminating a methacrylic resin layer and a hard coat layer on at least one surface of an MMA / styrene copolymer resin substrate.

As MMA · styrene copolymer resin substrate sheet display faceplate transparent multilayer sheet substrate of the present invention, transparency, processability, low moisture absorption properties, in terms of ready availability in the market, MMA · styrene copolymer A polymer resin is preferably used.

  The thickness of the MMA / styrene copolymer resin sheet used as the transparent multilayer sheet for the display faceplate of the present invention is appropriately determined depending on the size of the display, the method of use, etc. For a range of 2 to 50 inches, 0.5 mm to 4.0 mm is preferred.

  The thickness ratio of the MMA / styrene copolymer resin base material sheet to the entire multilayer sheet exhibits its low moisture absorption characteristics and is transparent for display faceplates to prevent warping even when environmental humidity changes. It is desirable that the total thickness of the multilayer sheet is 50% or more, and more preferably 60% to 96%.

  The MMA / styrene copolymer resin base sheet has high transparency, and the total light transmittance (JIS K7105) measured in the form of a sheet having a thickness of 2 mm is preferably 85% or more, and more preferably 87% to 92%.

  As the MMA / styrene copolymer resin in the present invention, a polymer obtained by copolymerizing a MMA monomer and styrene is used. The composition of MMA and styrene, which are the main components of this MMA / styrene copolymer resin, can be put to practical use within a molar ratio of MMA: styrene = 80: 20 to 20:80, preferably 75:25 to 50:50. Although it is possible, in order to improve adhesiveness with a methacrylic resin layer, it is preferable that the composition ratio of MMA is high, and on the other hand, it is preferable that the composition ratio of MMA is low in terms of moisture absorption characteristics. In addition, in order to increase the impact strength, the composition of the MMA / styrene copolymer resin may be copolymerized with a rubber component such as butadiene and a monomer copolymerizable with MMA / styrene for other purposes.

  The production method of the MMA / styrene copolymer resin in the present invention is not particularly limited, and any of those produced by a batch polymerization method or a continuous polymerization method can be used. Considering the difficulty, the continuous polymerization method is preferable.

  The molecular weight of the MMA / styrene copolymer resin in the present invention is not particularly limited.

  Also, it may contain various additives such as general heat stabilizers, UV absorbers, light-resistant stabilizers, colorants, mold release agents, lubricants and antistatic agents used in MMA / styrene copolymer resins. good.

Methacrylic resin layer In the present invention, the methacrylic resin layer supports the hard coat layer formed on the surface of the transparent multi-layer sheet for display face plate, and exhibits sufficient hardness, thereby damaging the surface of the transparent multi-layer sheet of the present invention. The purpose is to prevent. The thickness of the methacrylic resin layer necessary for exerting the hardness of the hard coat layer is preferably 30 μm or more, particularly 50 μm to 80 μm. On the other hand, as the thickness of the methacrylic resin layer increases, warping due to moisture absorption tends to occur. Therefore, it is necessary to limit the thickness to a sufficient level to achieve sufficient hardness. It is preferable to keep it within 20% of the total thickness, preferably 15% to 1.5%. Here, the thickness of a methacrylic resin layer means the thickness of one side, when a methacrylic resin layer exists in both surfaces of a base material sheet.

  As the methacrylic resin in the present invention, MMA monomer is contained in an amount of 85 mol% or more, preferably 90 mol% or more, and a monomer copolymerizable therewith, for example, acrylate ester such as methyl acrylate, styrene, and other copolymerizable Obtained by copolymerizing monomers. If the content of the MMA monomer is within this range, a practically sufficient surface hardness can be obtained as a transparent multilayer sheet when a hard coat layer is laminated on the methacrylic resin layer. In the methacrylic resin of the present invention, fine particles having a core-shell structure (multilayer polymer particles) in which a core layer made of a rubber-like polymer (crosslinked elastic polymer) is covered with a shell layer of a glassy polymer (thermoplastic polymer). Can be dispersed (see, for example, Patent Document 2). Furthermore, the methacrylic resin layer may contain various additives such as a general heat stabilizer, ultraviolet absorber, light resistance stabilizer, colorant, mold release agent, lubricant, and antistatic agent.

  It is also possible to improve impact strength by kneading and dispersing rubber particles by emulsion polymerization prepared by adjusting the refractive index of methacrylic resin and further adjusting the particle diameter.

  In the present invention, it is necessary that a methacrylic resin layer is laminated on at least one surface of the MMA / styrene copolymer resin base material sheet, but it is possible to obtain a methacrylic resin layer laminated on both surfaces of the base material sheet. This is effective for reducing warpage due to moisture absorption of the transparent multilayer sheet for display face plates.

  The methacrylic resin in the present invention has high transparency, and the total light transmittance measured in the form of a sheet having a thickness of 2 mm is preferably 85% or more, more preferably 87% to 93%.

Hard coat layer In general, an inorganic hard coat layer, an organic hard coat layer, an organic inorganic hard coat layer, a silicone hard coat layer, or the like can be used as the hard coat layer in the present invention.

The inorganic hard coat layer is made of, for example, SiO ₂ , Al ₂ O ₃ , TiO ₂ , ZrO ₂ or the like, and the layer is formed by vacuum deposition, sputtering, or the like on the acrylic resin layer.

  Examples of the organic hard coat layer include a type in which a melamine type, alkyd type, urethane type and acrylic resin paint is heat-cured, a type in which a polyfunctional acrylic resin paint is UV-cured, and the like.

  Examples of the organic / inorganic hard coat layer include those in which a photopolymerization reactive functional group is introduced on the surface of silica ultrafine particles and uniformly dispersed in the organic component of the ultraviolet curable hard coat material. Ultraviolet curable hard coat components and photosensitive groups of inorganic ultrafine particles undergo a polymerization reaction, resulting in the formation of a network-like crosslinked coating film in which ultrafine silica particles mediated by chemical bonds are uniformly dispersed in an organic matrix, etc. Is mentioned.

  Examples of the silicone hard coat layer include polycondensation of partial hydrolysates such as carbon functional alkoxysilane, alkyltrialkoxysilane, and tetraalkoxysilane, and those containing colloidal silica.

  In the present invention, as described above, a reaction type hard coat film containing alkoxysilane, which is said to be silane-based, can also be used, but in terms of productivity, it is a reactive crosslinking type of various organic compounds that are said to be organic-based. It is desirable to use a hard coat film.

  In particular, by using a scratch-resistant organic hard coat film of a type that is cured by irradiation with ultraviolet rays, a transparent multilayer sheet for a display faceplate can be stably produced with high productivity.

  Since the transparent multilayer sheet for display face plate of the present invention is used in an environment from low temperature to high temperature, it is necessary to determine the thickness of the hard coat layer in consideration of expansion and contraction of the sheet due to temperature change. In order to follow the expansion and contraction of the sheet due to temperature change, it is desirable that the thickness of the hard coat layer is thin, but the hardness of the sheet surface tends to decrease. On the other hand, if the thickness of the hard coat layer is large, curing shrinkage due to UV curing increases and cracks may occur. Therefore, the thickness of the hard coat layer in the transparent multilayer sheet for display faceplate is preferably about 1 to 20 μm, particularly about 3 to 12 μm, thereby satisfying both hardness and durability. Here, when there are two hard coat layers, the thickness of the hard coat layer means the thickness of one layer.

Transparent multilayer sheet for display faceplate The transparent multilayer sheet for display faceplate of the present invention can be produced, for example, as follows.

  First, as a method of laminating a methacrylic resin on at least one side of an MMA / styrene copolymer resin base material sheet, a sheet obtained by winding a methacrylic resin sheet on a sheet obtained by winding the MMA / styrene copolymer resin base material sheet is continuously formed. MMA / styrene copolymer resin and methacrylic resin continuously by the method of laminating, the method of laminating the wound sheet to the sheet continuously extruded by the melt extrusion method, the melt extrusion method Various methods such as a method of processing into a sheet while joining can be employed. Among them, the adhesion of the bonding surface can be improved, and as a method to prevent foreign matter from being caught in the bonding surface during bonding, it is processed into a sheet while continuously joining different resin materials by the melt extrusion method. Is preferred.

  The method of continuously joining different types of resin materials while melting them is the method of pasting after discharge from the sheet extrusion die, and the sheet-shaped die after being integrated inside the sheet extrusion die. There is a method of forming a laminated sheet by extrusion. Any method can be applied to produce the transparent multilayer sheet for display faceplate of the present invention. In the present invention, a method of forming a laminated sheet by extruding from a sheet-shaped die after being integrated inside a die for sheet extrusion, that is, a method using a multilayer die is a method suitable for enhancing adhesion. It is.

  As the die used in the method using the multilayer die, those generally used when producing a multilayer film or a multilayer sheet can be used. Feed block type dies or multi-manifold type dies may be used, but in order to minimize variations in the thickness of each layer, it is better to use multi-manifold type dies. Bring.

  Examples of the method for laminating the hard coat layer on the methacrylic resin layer include the following. For example, there is a roll coating method in which coating is performed by supplying paint to two metal or rubber rolls and passing a plate through the gap between the rolls. This is suitable when painting a plate or film. There is a spin coating method in which a coating material is dropped on the center of the product to be painted and rotated to spread the coating material on the surface of the product. This is suitable for the case where a shape close to a circle is coated with a uniform film thickness. There is a spray coating method in which the paint is sprayed on the surface of the coated product. This is suitable for painting molded articles having a three-dimensional shape. There is a dip coating method in which an article to be coated is dipped in a paint liquid and gently pulled up. Thereby, the front and back, such as plate shape, a curved surface, and a three-dimensional shape, can be painted at a time. There is a flow coat method in which a paint is cast on a product to be painted. This can be coated on both sides, such as a plate or curved surface, or on one side.

  Specific examples of the layer structure of the transparent multilayer sheet for a display faceplate of the present invention include a MMA / styrene copolymer resin sheet as an MS sheet, a methacrylic resin layer as an MA layer, and a hard coat layer as an HC layer. MA layer / HC layer, MA layer / MS sheet / MA layer / HC layer, HC layer / MA layer / MS sheet / MA layer / HC layer and the like. In addition, other layers can be added to these layer structures as long as the effects of the present invention are achieved.

  In particular, as specific examples of the layer structure of the transparent multilayer sheet for display faceplates having methacrylic resin layers on both sides of the MMA / styrene copolymer resin sheet, MA layer / MS sheet / MA layer / HC layer, HC layer / MA layer / MS sheet / MA layer / HC layer.

  The “having a hard coat layer on both surfaces of the methacrylic resin layer on both sides of the MMA / styrene copolymer resin sheet” of the present invention has a layer structure of HC layer / MA layer / MS sheet / MA layer / HC layer. Have.

The transparent multilayer sheet for a display face plate obtained as described above has a pencil hardness (JISK5600) on the hard coat layer as high as about 4H to 5H. Steel wool # 0000 (manufactured by Nippon Steel Wool Co., Ltd.) Even after 10 reciprocations at 500 g / cm ^2, scars are hardly observed, and the film has excellent scratch resistance.

  The transparent multilayer sheet for display face plate of the present invention is mainly intended to protect display devices of flat display devices such as liquid crystal (TN liquid crystal, STN liquid crystal, TFT liquid crystal, etc.) display devices, organic electroluminescence (organic EL) devices, etc. Attached to its surface.

  The thickness of the transparent multilayer sheet for display faceplate of the present invention can be appropriately selected according to need, but the required thickness of the transparent multilayer sheet for display faceplate is often determined by the size of the display. For a 2 to 5 inch small size display, the total thickness of the face plate transparent sheet is 0.4 to 0.8 mm, and for a 20 to 50 inch large size display, the total thickness of the face plate transparent sheet is used. 1.2 to 4.0 mm is often used.

  The transparent multilayer sheet for display face plate of the present invention has good adhesion between the resin layers and is excellent in transparency, moisture deformation resistance, hardness, and scratch resistance, and thus protects the display device of the flat display device. It is suitably used as a transparent multilayer sheet.

  Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited by the examples.

[Test method]
Specifically, each test in the examples was performed as follows.

1. Total light transmittance The total light transmittance was measured according to JIS K7105.

2. Pencil hardness The pencil hardness was measured according to JIS K5600.

3. Steel Wool Hardness Steel wool hardness was measured by reciprocating steel wool # 0000 with a load of 500 g / cm ² and observing the degree of scratches after 10 reciprocations. Scratchability was shown in 10 stages, with 1 when there was no scratch and 10 when innumerable scratches occurred.

4). Moisture resistance test sled After hard coat processing, the sheet was cut into 200 mm × 200 mm, and a polyethylene-based masking film (Daio processed paper, FM-125, 60 μm) was stuck on one side so as not to have air bubbles or floats. After holding this sheet in an environment of 60 ° C. and 95% relative humidity for 36 hours, the masking film stuck on one side is peeled off, kept at room temperature, and the convex side is down, and a smooth 5 mm The gap between the four corners and the surface of the plate glass was measured by placing it on a thick plate glass plate, and the average value was obtained.

5). Adhesiveness After the transparent multilayer sheet was bent 10 times so that the curvature radius was 200 mm, the presence or absence of peeling at the laminated interface was examined.

[Example 1]
Extruder (Main extruder: Tanabe Plastic, extrusion screw diameter: 40 mm, L / D: 32, Sub-extruder: Plastic Giken, extrusion screw diameter: 25 mm, L / D: 24) and feed block 3-layer die MMA / styrene copolymer resin (manufacturer: Nippon A & L Co., Ltd., varieties: Planetloy KM-6A, MMA = 60.9 mol%, styrene = 39.1 mol%, random polymerized product) Then, methacrylic resin (manufacturer: Mitsubishi Rayon Co., Ltd., varieties Acrypet VH, MMA = 98 mol% or more, random polymerization product) is put into the sub-extruder, the main extruder is cylinder temperature 220 ° C., screw rotation speed 40 rpm, sub-extrusion A methacrylic resin layer was formed on both sides of the MMA / styrene copolymer resin at a cylinder temperature of 250 ° C. and a screw rotation speed of 10 rpm.

  As described above, a three-layer 1.5 mm thick sheet having a methacrylic resin layer of 60 μm on both sides of a MMA / styrene copolymer resin layer of about 1380 μm was obtained.

  On both surfaces of this methacrylic resin layer, a hard coat layer of 4 μm was formed by a roll coating method using an ultraviolet curable hard coat paint (Nippon Synthetic Chemical Industry Co., Ltd., Shikko UT-4256) made of a polyfunctional acrylic resin.

  The pencil hardness of this transparent multilayer sheet hard coat product was 4 to 5H, and there was no scratch even after 10 reciprocations with steel wool # 0000, and the scratch resistance was excellent. Further, this transparent multilayer sheet hard coat product was a good plate with almost no warpage due to changes in environmental humidity.

[Example 2]
Extruder (Main extruder: Tanabe Plastic, extrusion screw diameter: 40 mm, L / D: 32, Sub-extruder: Plastic Giken, extrusion screw diameter: 25 mm, L / D: 24) and feed block 3-layer die MMA / styrene copolymer resin (Manufacturer: Nippon A & L Co., Ltd., varieties: Planetero KM-6A, MMA = 60.9 mol%, styrene = 39.1 mol%, random polymerized product) Then, methacrylic resin (manufacturer: Denki Kagaku Kogyo Co., Ltd., varieties: TX polymer, KT-80, MMA = 90.3 mol%, styrene = 9.7 mol%, random polymerized product) is introduced into the sub-extruder. The main extruder has a cylinder temperature of 220 ° C. and a screw rotation speed of 40 rpm, and the sub-extruder has a cylinder temperature of 250 ° C. and a screw rotation speed of 10 rpm. It was formed Le resin layer.

  As described above, a three-layer 1.5 mm thick sheet having a methacrylic resin layer of 60 μm on both sides of a MMA / styrene copolymer resin layer of about 1380 μm was obtained.

  On both surfaces of the methacrylic resin layer, a hard coat layer of 4 μm was formed by a roll coating method using an ultraviolet curable hard coat paint (Nippon Synthetic Chemical Industry Co., Ltd., Shikko UT-4256) made of a polyfunctional acrylic resin.

  The pencil hardness of this transparent multilayer sheet hard coat product was 4 to 5H, and there was almost no scratch even after 10 reciprocations with steel wool # 0000, and the scratch resistance was excellent. Further, this transparent multilayer sheet hard coat product was a good plate with almost no warpage due to changes in environmental humidity.

[Comparative Example 1]
Using an extruder (main extruder: Tanabe Plastic, extrusion screw diameter: 40 mm, L / D: 32) and a single layer die, MMA / styrene copolymer resin (manufacturer: Nippon A & L Co., Ltd.) A 1.5 mm sheet of cultivar: Planeteroy KM-6A) was obtained. On both sides of this MMA / styrene copolymer resin layer, a hard coat layer of 4 μm is formed by a roll coating method using an ultraviolet curable hard coat coating material (Nippon Gosei Chemical Co., Ltd., Shikko UT-4256) made of a polyfunctional acrylic resin. Formed.

  This transparent sheet hard coat product had a pencil hardness of 2 to 3H, and after 10 reciprocations with steel wool # 0000, scratches were generated, which was a practically undesirable level. On the other hand, the transparent sheet hard coat product was a good plate in terms of this warp, with almost no warp due to changes in environmental humidity.

[Comparative Example 2]
Using an extruder (main extruder: Tanabe Plastics, extrusion screw diameter: 40 mm, L / D: 32) and a single-layer die, a methacrylic resin (manufacturer: Mitsubishi Rayon Co., Ltd., Acrypet VH) 1. A 5 mm sheet was obtained.

  A hard coat layer of 4 μm was formed on both surfaces of this acrylic resin layer by a roll coating method using an ultraviolet curable hard coat paint (Nippon Synthetic Chemical Industry Co., Ltd., Shikko UT-4256) made of a polyfunctional acrylic resin.

  The pencil hardness of this transparent sheet hard coat product was 4 to 5H, and there was almost no scratch even after 10 reciprocations with steel wool # 0000, and the scratch resistance was excellent. However, this transparent sheet hard coat product was severely warped due to changes in the humidity of the environment and was at a practically problematic level.

[Comparative Example 3]
Extruder (Main extruder: Tanabe Plastic, extrusion screw diameter: 40 mm, L / D: 32, Sub-extruder: Plastic Giken, extrusion screw diameter: 25 mm, L / D: 24) and feed block 3-layer die MMA / styrene copolymer resin (Manufacturer: Nippon A & L Co., Ltd., varieties: Planetloy KM-6A, MMA = 60.9 mol%, styrene = 39.1 mol%, random polymerized product)) MS resin (Manufacturer: Denki Kagaku Kogyo Co., Ltd., varieties: TX polymer, KT-75, MMA = 80.6 mol%, styrene = 19.4 mol%, random polymerized product) is charged into the sub-extruder, and the main extruder is Containing MMA on both sides of MMA / styrene copolymer resin with MMA content of 60.9mol% with cylinder temperature of 220 ° C, screw rotation speed of 40rpm, sub-extruder with cylinder temperature of 250 ° C and screw rotation speed of 10rpm To form MMA · styrene copolymer resin layer of 80.6mol%. As described above, the MMA / styrene copolymer resin layer having an MMA content of 60.9 mol% is approximately 1380 μm, and the 1.5 mm thickness of three layers each having an MMA / styrene copolymer resin layer having an MMA content of 80.6 mol% of 60 μm on both sides. A sheet was obtained. On both sides, a hard coat layer of 4 μm was formed by a roll coating method using an ultraviolet curable hard coat paint (Nippon Synthetic Chemical Industry Co., Ltd., Seiko UT-4256) made of a polyfunctional acrylic resin.

  The transparent sheet hard coat product had a pencil hardness of 3H, and after 10 reciprocations with steel wool # 0000, scratches were generated, which was a practically undesirable level. On the other hand, this transparent sheet hard coat product was a good plate in terms of the warp, with almost no warp due to changes in environmental humidity.

  The results of Examples 1 and 2 and Comparative Example 1-3 are shown in Table 1.

Claims (7)

  The MMA / styrene copolymer resin sheet has a methacrylic resin layer on at least one surface, the methacrylic resin layer has a methyl methacrylate (MMA) content of 85 mol% or more, and the surface of the methacrylic resin layer. A transparent multilayer sheet for a display faceplate having a hard coat layer on at least one of the above.   The transparent multilayer sheet for a display faceplate according to claim 1, wherein a methacrylic resin layer is provided on both surfaces of the MMA / styrene copolymer resin sheet.   The transparent multilayer sheet for display faceplates of Claim 2 which has a hard-coat layer on both the surfaces of the methacrylic resin layer in both surfaces of a MMA and a styrene copolymer resin sheet.   The transparent multilayer sheet for display faceplate as described in any one of Claims 1-3 whose thickness of a methacryl resin layer is 30 micrometers or more.   The transparent multilayer sheet for display faceplate as described in any one of Claims 1-4 whose thickness of a methacryl resin layer is less than 20% of the thickness of the whole multilayer sheet.   The transparent multilayer sheet for display faceplate as described in any one of Claims 1-5 whose thickness of a hard-coat layer is 3 thru | or 12 micrometers.   The transparent multilayer sheet for a display faceplate according to any one of claims 1 to 6, wherein the hard coat layer is cured by ultraviolet rays.