WO2021020222A1 - Surface protection panel, multilayer member and image display device each using same, and method for producing surface protection panel - Google Patents

Surface protection panel, multilayer member and image display device each using same, and method for producing surface protection panel Download PDF

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Publication number
WO2021020222A1
WO2021020222A1 PCT/JP2020/028188 JP2020028188W WO2021020222A1 WO 2021020222 A1 WO2021020222 A1 WO 2021020222A1 JP 2020028188 W JP2020028188 W JP 2020028188W WO 2021020222 A1 WO2021020222 A1 WO 2021020222A1
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Prior art keywords
layer
protective plate
functional
surface protective
functional layer
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PCT/JP2020/028188
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French (fr)
Japanese (ja)
Inventor
知則 西田
晋 宮崎
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大日本印刷株式会社
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Priority to JP2021536968A priority Critical patent/JPWO2021020222A1/ja
Publication of WO2021020222A1 publication Critical patent/WO2021020222A1/en

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00Layered products comprising a layer of synthetic resin
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/10Optical coatings produced by application to, or surface treatment of, optical elements
    • G02B1/14Protective coatings, e.g. hard coatings
    • GPHYSICS
    • G02OPTICS
    • G02FOPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333Constructional arrangements; Manufacturing methods
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09FDISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements

Definitions

  • the core layer is mainly composed of resin.
  • the main component means 50% by mass or more of the total solid content constituting the core layer, preferably 70% by mass or more, more preferably 90% by mass or more, still more preferably 95% by mass or more, still more preferably 99. It is mass% or more.
  • thermoplastic resins include polystyrene-based resins, polyolefin-based resins, ABS resins, AS resins, AN resins, polyphenylene oxide-based resins, polycarbonate-based resins, polyacetal-based resins, acrylic-based resins, polyethylene terephthalate-based resins, and polybutylene tephthalate-based resins.
  • the width of the edge portion is not particularly limited, but is usually about 1 to 20 mm, preferably 2 to 10 mm.
  • the color of the colored layer is arbitrary, but it is preferably a dark color such as black or brown.
  • Ra-A and Ra-B shall mean the arithmetic mean roughness of JIS B0601: 1994 when the cutoff value ⁇ c is 0.8 mm.
  • Ra-A is preferably 0.01 to 10 ⁇ m, more preferably 0.01 to 0.149 ⁇ m, and even more preferably 0.01 to 0.114 ⁇ m.
  • Ra-B is preferably 0.1 ⁇ m or less, more preferably 0.03 ⁇ m or less, and further preferably 0.01 ⁇ m or less.
  • Sm-A means the average spacing of the unevenness of JIS B0601: 1994 when the cutoff value ⁇ c is 0.8 mm. Further, Sm-A shall mean the average of the average intervals of the unevenness of 18 points obtained by rounding down the maximum value and the minimum value from the measured values of any 20 points.
  • the surface unevenness of the hard coat layer A corresponds to a lens for the pixels of the display element.
  • the arithmetic average roughness Ra is large, the thickness of the unevenness (in other words, the thickness of the lens) increases and the glare (a phenomenon in which minute variations in brightness are visible in the image light) worsens.
  • the average spacing Sm of the unevenness is large, the spacing between the irregularities (in other words, the diameter of the lens) tends to increase and the glare tends to worsen.
  • Ra-A When Ra-A is 0.050 ⁇ m or more and the formula (A2) is satisfied, the antiglare property can be improved. If Ra-A is too large, the thickness of the lens formed by the unevenness tends to increase, the glare tends to deteriorate, and the image sharpness tends to decrease. Therefore, Ra-A is preferably 0.060 to 0.300 ⁇ m, more preferably 0.070 to 0.200 ⁇ m, and even more preferably 0.080 to 0.130 ⁇ m.
  • the pencil hardness of the hard coat layer A is defined as Ha-A and the pencil hardness of the hard coat layer B is defined as Ha-B
  • the scratch resistance of the hard coat layer A on the front surface side, where scratch resistance is important can be easily improved, while the hard coat layer B on the back surface side can be easily improved. It is possible to easily improve the adhesion with the layer adjacent to the hard coat layer B.
  • the pencil hardness of the hard coat layer A is preferably H or higher, more preferably 2H or higher, and even more preferably 3H or higher. Further, the pencil hardness of the hard coat layer B is preferably 3B to 2H, and more preferably 2B to H. In this specification, the pencil hardness is based on the highest hardness that has not been scratched by performing the pencil hardness test (4.9 N load) specified in JIS K5600-5-4: 1999.
  • the hard coat layer A is formed from an electron beam curable resin composition described later, while the hard coat layer B is formed from an ultraviolet curable resin composition described later.
  • the hard coat layer A is formed from the electron beam curable resin composition, the scratch resistance of the hard coat layer A can be easily improved, and an ultraviolet absorber can be easily added to the hard coat layer A, so that the surface protective plate can be easily formed. It is possible to easily improve the weather resistance of the resin. Further, by forming the hard coat layer B from the ultraviolet curable resin composition, it is possible to easily improve the adhesion with the layer adjacent to the hard coat layer B.
  • Examples of the layer structure of the functional layer B include the following B1 to B6.
  • B1 to B6 below, "/" means the interface of the layers, and the layer located on the left side means the layer located on the core layer side.
  • B1 Adhesive layer B / Hard coat layer B (B2) Adhesive layer B / Anchor layer B / Hard coat layer B (B3) Adhesive layer B / Hard coat layer B / Antireflection layer B (B4) Adhesive layer B / Anchor layer B / Hard coat layer B / Antireflection layer B (B5) Hard coat layer B (B6) Hard coat layer B / Antireflection layer B
  • the adhesive layer may be a pressure-sensitive adhesive layer (so-called “adhesive layer”) or a heat-sensitive adhesive layer (so-called “heat seal layer”).
  • adhesive layer is preferably a heat-sensitive adhesive layer.
  • a heat-sensitive or pressure-sensitive resin suitable for the material of the core layer for the adhesive layer is preferable to use a heat-sensitive or pressure-sensitive resin suitable for the material of the core layer for the adhesive layer.
  • the material of the core layer is an acrylic resin
  • the material of the core layer is a polyphenylene oxide-based resin, a polycarbonate-based resin, or a styrene-based resin
  • the material of the core layer is polypropylene resin
  • the hard coat layer A and the hard coat layer B preferably contain a cured product of a curable resin composition such as a thermosetting resin composition or an ionizing radiation curable resin composition, and from the viewpoint of improving scratch resistance. , It is more preferable to contain a cured product of the ionizing radiation curable resin composition.
  • typical examples of the ionizing radiation curable resin composition include an ultraviolet curable resin composition and an electron beam curable resin composition.
  • the electron beam curable resin composition has features such as no initiator is required and it is easy to cure instantly to form a dense and hard film.
  • the term "hard coat layer" refers to both the hard coat layer A and the hard coat layer B.
  • the thermosetting resin composition is a composition containing at least a thermosetting resin, and is a resin composition that is cured by heating.
  • the thermosetting resin include acrylic resin, urethane resin, phenol resin, urea melamine resin, epoxy resin, unsaturated polyester resin, and silicone resin.
  • a curing agent is added to these curable resins as needed.
  • the bifunctional (meth) acrylate-based monomers include ethylene glycol di (meth) acrylate, bisphenol A tetraethoxydiacrylate, bisphenol A tetrapropoxydiacrylate, and 1,6-hexane. Examples thereof include diol diacrylate.
  • the trifunctional or higher functional (meth) acrylate-based monomer include trimethylolpropane tri (meth) acrylate, pentaerythritol tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, dipentaerythritol hexa (meth) acrylate, and di.
  • polyfunctional (meth) acrylate-based oligomer examples include acrylate-based polymers such as urethane (meth) acrylate, epoxy (meth) acrylate, polyester (meth) acrylate, and polyether (meth) acrylate.
  • Urethane (meth) acrylate is obtained, for example, by reacting a polyhydric alcohol or organic diisocyanate with a hydroxy (meth) acrylate.
  • the preferable epoxy (meth) acrylate is a (meth) acrylate obtained by reacting a (meth) acrylic acid with a trifunctional or higher functional aromatic epoxy resin, an alicyclic epoxy resin, an aliphatic epoxy resin or the like, and a bifunctional epoxy resin.
  • (Meta) acrylate obtained by reacting the above aromatic epoxy resin, alicyclic epoxy resin, aliphatic epoxy resin, etc. with polybasic acid and (meth) acrylic acid, and bifunctional or higher functional aromatic epoxy resin, It is a (meth) acrylate obtained by reacting an alicyclic epoxy resin, an aliphatic epoxy resin or the like with phenols and (meth) acrylic acid.
  • the ionizing radiation curable compound may be used alone or in combination of two or more.
  • the ionizing radiation curable compound when the ionizing radiation curable compound is an ultraviolet curable compound, the ionizing radiation curable composition preferably contains an additive such as a photopolymerization initiator or a photopolymerization accelerator.
  • a photopolymerization initiator include one or more selected from acetophenone, benzophenone, ⁇ -hydroxyalkylphenone, Michler ketone, benzoin, benzyl dimethyl ketal, benzoyl benzoate, ⁇ -acyl oxime ester, thioxanthones and the like.
  • the photopolymerization accelerator can reduce the polymerization inhibition by air at the time of curing and accelerate the curing rate. For example, from p-dimethylaminobenzoic acid isoamyl ester, p-dimethylaminobenzoic acid ethyl ester and the like. One or more selected species can be mentioned.
  • the functional layer A may have an anchor layer A for improving heat resistance.
  • the functional layer B may have an anchor layer B.
  • anchor layer refers to both the anchor layer A and the anchor layer B.
  • the anchor layer preferably contains a cured product of the curable resin composition.
  • the curable resin composition include a thermosetting resin composition and an ionizing radiation curable resin composition.
  • the embodiment of the thermosetting resin composition and the ionizing radiation curable resin composition of the anchor layer is the same as the embodiment of the thermosetting resin composition and the ionizing radiation curable resin composition of the hard coat layer.
  • the thickness of the anchor layer is preferably 0.1 to 6 ⁇ m, more preferably 0.5 to 5 ⁇ m.
  • the functional layer A may have an antireflection layer A on the surface side in order to suppress reflection on the surface.
  • the functional layer B may have an antireflection layer B on the back surface side in order to improve the light transmittance of the surface protective plate.
  • antireflection layer refers to both the antireflection layer A and the antireflection layer B.
  • the antireflection layer examples include a single-layer structure having a low refractive index layer and a two-layer structure having a high refractive index layer and a low refractive index layer.
  • the high refractive index layer is arranged on the core layer side.
  • the refractive index and thickness of the high refractive index layer and the low refractive index layer may be adjusted within a conventionally known range.
  • the antireflection layer such as the high refractive index layer and the low refractive index layer can be roughly classified into those formed by the wet method and those formed by the dry method.
  • the antireflection layer is preferably formed by a wet method from the viewpoint of preventing cracking during molding.
  • the refractive index of the low refractive index layer is preferably 1.10 to 1.48, more preferably 1.20 to 1.45, more preferably 1.26 to 1.40, and more preferably 1.28 to 1.38. Preferably, 1.30 to 1.32 are more preferable.
  • the content of the low refractive index particles is preferably 50 to 400 parts by mass, more preferably 60 to 300 parts by mass, more preferably 70 to 200 parts by mass, and voids in the particles having voids with respect to 100 parts by mass of the binder component. 70 to 250 parts by mass is preferable, 90 to 200 parts by mass is more preferable, and 100 to 150 parts by mass is more preferable.
  • the high refractive index layer can be formed from, for example, a binder resin composition and a high refractive index layer coating liquid containing high refractive index particles.
  • a binder resin composition for example, the curable resin composition exemplified in the hard coat layer can be used.
  • the thickness of the film layer is preferably 40 ⁇ m to 500 ⁇ m, more preferably 100 ⁇ m to 300 ⁇ m, and even more preferably 150 ⁇ m to 280 ⁇ m from the viewpoint of moldability and handleability.
  • the film layer A of the surface protection plate of the present invention preferably has a primer layer A on the surface of the film layer A on the side in contact with the functional layer A.
  • the surface protective plate includes the film layer B, it is preferable to have the primer layer B on the surface of the film layer B on the side in contact with the functional layer B.
  • the thickness of the primer layer is preferably 0.1 to 10 ⁇ m, more preferably 0.2 to 5 ⁇ m, and even more preferably 0.3 to 3 ⁇ m.
  • Injection molding when the laminate A or the laminate B is a transfer sheet is so-called "in-mold molding". Injection molding when both the laminate A and the laminate B are transfer sheets is so-called “double in-mold molding". Injection molding when the laminated body A or the laminated body B is a laminated film is so-called “insert molding”. Injection molding when both the laminated body A and the laminated body B are laminated films is so-called “double insert molding”. Injection molding when one of the laminated body A and the laminated body B is a transfer sheet and the other is a laminated film is so-called "double insert-in mold molding".
  • the transfer sheet A used in the step (1) can be obtained by sequentially forming each layer constituting the functional layer A on the release sheet.
  • the transfer sheet B used in the step (1) can be obtained by sequentially forming each layer constituting the functional layer B on the release sheet and then forming a colored layer on a part of the functional layer B. ..
  • the colored layer is preferably formed by melt heat transfer of a solid colored layer (for example, an ink ribbon).
  • the surface shape of the hard coat layer is similar to the inverted surface shape of the release sheet. That is, the surface shapes of the hard coat layer A and the hard coat layer B can be adjusted by the surface shape of the release sheet.
  • thermoplastic resins include polystyrene-based resins, polyolefin-based resins, ABS resins (including heat-resistant ABS resins), AS resins, AN resins, polyphenylene oxide-based resins, polycarbonate-based resins, polyacetal-based resins, and acrylic-based resins.
  • thermoplastic resins include polystyrene-based resins, polyolefin-based resins, ABS resins (including heat-resistant ABS resins), AS resins, AN resins, polyphenylene oxide-based resins, polycarbonate-based resins, polyacetal-based resins, and acrylic-based resins.
  • examples thereof include one or a mixture selected from a polyethylene terephthalate resin, a polybutylene tephthalate resin, a polysulphon resin, and a polyphenylene sulfide resin.
  • step (2) when the resin is injected into the injection molding mold, the material of the layer (the layer located on the core layer side of the functional layers, the colored layer, or the film layer) that is in direct contact with the injection resin is selected. In consideration, it is preferable to adjust the temperature, pressure, and speed of the injection resin so that the adhesion is good.
  • the method for producing the surface protective plate of the present invention preferably further includes the following step (3).
  • step (3) A step of opening the mold and peeling the release sheet of the transfer sheet from the laminated body X.
  • step (3) in order to suppress foil breakage and transfer defects of the functional layer when the release sheet is peeled off, a combination of the core layer material and the functional layer material may be selected, or the functional layer may be selected. It is preferable to adjust the thickness.
  • the laminated member of the present invention in which the functional member is bonded to the back surface side of the surface protective plate can make it difficult to change the optical axis of the plastic film of the functional member, and suppresses a decrease in visibility. can do.
  • Methacrylic acid alkyl esters such as butyl methacrylate, 2-ethylhexyl methacrylate, cyclohexyl methacrylate and benzyl methacrylate can be mentioned.
  • a vinyl group-containing compound such as vinyl acetate, vinyl propionate, vinyl ether, styrene, acrylonitrile, and methacrylonitrile may be used as the copolymerization monomer.
  • the thickness of the adhesive layer is preferably 0.1 to 50 ⁇ m, more preferably 0.5 to 30 ⁇ m.
  • the laminated member of the present invention it is preferable that there is no glass between the plastic film located closest to the surface protective plate side of the functional member and the adhesive layer.
  • the laminated member has such a structure, the effect of the present invention can be easily exerted.
  • the functional member having at least one plastic film may be a single layer of the plastic film, or may be a functional member having a member other than the plastic film (for example, a touch panel).
  • the touch panel including the plastic film include a capacitance type touch panel, a resistive touch panel, an optical touch panel, an ultrasonic touch panel, an electromagnetic induction type touch panel and the like.
  • Plastic film Examples of the plastic film contained in the functional member include polyester, triacetyl cellulose (TAC), cellulose diacetate, cellulose acetate butyrate, polyamide, polyimide, polyether sulphon, polysulphon, polypropylene, polymethylpentene, and polyvinyl chloride. Examples thereof include those formed of resins such as polyvinyl acetal, polyether ketone, polymethyl methacrylate, polycarbonate, polyurethane and amorphous olefin (Cyclo-Olfin-Polyester: COP). Among these plastic films, the stretched plastic film tends to affect the visibility due to the change of the optical axis.
  • the image display device of the present invention comprises the above-mentioned laminated member of the present invention on a display element, and is arranged so that the surface of the laminated member on the functional member side faces the display element side. It is a thing.
  • Examples of the display element include a liquid crystal display element, an EL display element, a plasma display element, an electronic paper element, and the like.
  • a hard coat layer A was formed by applying, drying, and irradiating ultraviolet rays on an acrylic film having a thickness of 250 ⁇ m so that the thickness of the hard coat coating liquid 1 after drying was 4 ⁇ m.
  • the coating liquid 1 for the low refractive index layer 1 is coated, dried, and irradiated with ultraviolet rays on the hard coat layer A so that the thickness after drying becomes 100 nm, and the single antireflection layer A of the low refractive index layer A is irradiated.
  • Example 2 The laminated film 1 produced in the above "4" is arranged on one side of a pair of upper and lower injection molding dies, and the transfer sheet 2 produced in the above "3" is arranged on the other side of the mold. did.
  • the laminated film 1 was arranged so that the side surface of the film layer faces the inside of the mold (the side in contact with the injection resin).
  • the transfer sheet 2 was arranged so that the surface opposite to the release sheet faces the inside of the mold (the side in contact with the injection resin).
  • the mold is closed, the injection resin (polycarbonate resin) is injected into the mold, the surface of the laminated film 1 on the film layer A side, the core layer (thickness 2.0 mm) containing the injection resin, and the above.
  • a laminated body X in which the surface of the transfer sheet 2 opposite to the release sheet was in close contact was obtained. Then, after opening the mold, the release sheet of the transfer sheet 2 was peeled off from the laminated body X. Next, ultraviolet irradiation (irradiation amount 800 mJ / cm 2 ) was performed to accelerate the curing of the hard coat layers A and B, and the surface protective plate of Example 2 was obtained.
  • the surface protective plate of Example 2 has an antireflection layer A, a hard coat layer A, a film layer A, a core layer, and a colored layer (Note: the colored layer is partially formed instead of the entire surface) from the front surface side to the back surface side.
  • the adhesive layer B and the hard coat layer B were provided in this order.
  • the surface protective plate of Example 2 has an antireflection layer A, a hard coat layer A, a film layer A, a core layer, and a colored layer (Note: the colored layer is partially formed instead of the entire surface) from the front surface side to the back surface side.
  • the adhesive layer B and the hard coat layer B were provided in this order. Since the surface protection plate of Reference Example 1 is formed by laminating the functional layer B, the position of the surface of the colored layer on the functional layer B side and the surface of the core layer on the functional layer B side in the region without the colored layer. The positions of are not substantially the same in the thickness direction of the surface protective plate, and an inclination is formed at the boundary between the region having the colored layer and the region having no colored layer on the outermost surface on the back surface side of the surface protective plate. Had had.
  • the surface protective plates of Examples 1 and 2 can suppress a decrease in visibility when a functional member containing a plastic film is attached to the back surface via an adhesive layer.
  • the functional layer B is formed by laminating, the boundary between the region having the colored layer and the region not having the colored layer is inclined on the outermost surface on the back surface side of the surface protective plate. As a result, the visibility was inferior to that of Examples 1 and 2.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Mathematical Physics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Chemical & Material Sciences (AREA)
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  • Injection Moulding Of Plastics Or The Like (AREA)
  • Laminated Bodies (AREA)

Abstract

The present invention provides a surface protection panel having a colored layer, said surface protection panel being capable of suppressing decrease in visibility if a functional member comprising a plastic film is bonded to the back surface of the surface protection panel, with an adhesive layer being interposed therebetween. A surface protection panel which sequentially comprises, from the front surface side toward the back surface side, a functional layer A, a core layer that is mainly composed of a resin, and a functional layer B in this order, wherein the core layer comprises a colored layer in at least a part of the functional layer B-side surface.

Description

表面保護板、並びにそれを用いた積層部材及び画像表示装置、並びに表面保護板の製造方法A surface protective plate, a laminated member and an image display device using the same, and a method for manufacturing the surface protective plate.
 本発明は、表面保護板、並びにそれを用いた積層部材及び画像表示装置、並びに表面保護板の製造方法に関する。 The present invention relates to a surface protective plate, a laminated member and an image display device using the same, and a method for manufacturing the surface protective plate.
 液晶表示装置及び有機EL表示装置等の画像表示装置は、装置内部の電気回路等を隠蔽することなどを目的として、装置表面の周縁部にベゼルカバーを配置する場合がある。 Image display devices such as liquid crystal display devices and organic EL display devices may have a bezel cover placed on the peripheral edge of the device surface for the purpose of concealing an electric circuit or the like inside the device.
 しかし、表面にベゼルカバーを配置した画像表示装置は、デザインが制限されたり、表示面のフラット性が損なわれたりする問題がある。特に、近年の携帯型の画像表示装置は静電容量式のタッチパネルを内蔵しているものが多いため、ベゼルカバーが存在することにより指が引っ掛かり、タッチパネルの操作性が低下してしまう。 However, the image display device with the bezel cover placed on the surface has problems that the design is limited and the flatness of the display surface is impaired. In particular, since many portable image display devices in recent years have a built-in capacitance type touch panel, the presence of the bezel cover causes a finger to be caught and the operability of the touch panel is deteriorated.
 このため、画像表示装置を構成する部材に加飾印刷を施す手段が提案されている(例えば特許文献1)。 For this reason, a means for performing decorative printing on a member constituting an image display device has been proposed (for example, Patent Document 1).
特開2011-93977号公報(請求項8、段落0038、段落0043)JP-A-2011-93977 (Claim 8, paragraph 0038, paragraph 0043)
 特許文献1には、基材フィルムの一方の面に、部分的にグラビア印刷及びスクリーン印刷等で加飾印刷し、前記基材フィルムの加飾印刷層を有する面と、基材レス粘着シートの粘着剤面とを貼り合わせてなる、加飾印刷層付き粘着シートが記載されている。 In Patent Document 1, one surface of the base film is partially decoratively printed by gravure printing, screen printing, or the like, and the surface having the decorative printing layer of the base film and the base material-less adhesive sheet are described. An adhesive sheet with a decorative printing layer, which is formed by laminating the adhesive surface, is described.
 特許文献1の加飾印刷層付き粘着シートは、加飾印刷層により隠蔽性を付与し得るため、ベゼルカバーを省略することが可能である。しかし、特許文献1の加飾印刷層付き粘着シートの粘着層側にプラスチックフィルムを含む機能性部材を貼り合わせた際に、画像表示装置の視認性が低下するケースが頻発した。 Since the adhesive sheet with the decorative printing layer of Patent Document 1 can be concealed by the decorative printing layer, the bezel cover can be omitted. However, when a functional member containing a plastic film is attached to the adhesive layer side of the adhesive sheet with a decorative printing layer of Patent Document 1, the visibility of the image display device is often lowered.
 本発明は、このような実情に鑑みてなされたものであり、表面保護板の背面に粘着層を介してプラスチックフィルムを含む機能性部材を貼り合わせた際に、視認性が低下することを抑制し得る、着色層を有する表面保護板を提供することを課題とする。また、本発明は、前記表面保護板を簡易に製造する方法を提供することを課題とする。また、本発明は、視認性が低下することを抑制し得る積層部材、及び前記積層部材を用いた画像表示装置を提供することを課題とする。 The present invention has been made in view of such circumstances, and suppresses deterioration of visibility when a functional member containing a plastic film is attached to the back surface of a surface protective plate via an adhesive layer. It is an object of the present invention to provide a surface protective plate having a colored layer which can be used. Another object of the present invention is to provide a method for easily manufacturing the surface protective plate. Another object of the present invention is to provide a laminated member capable of suppressing a decrease in visibility and an image display device using the laminated member.
 上記課題を解決すべく、本発明は、以下の[1]~[15]を提供する。
[1]表面側から背面側に向けて、機能層A、樹脂を主成分とするコア層、機能層Bをこの順に有してなり、さらに、前記コア層の前記機能層B側の面の一部に着色層を有してなる、表面保護板。
[2]前記着色層の前記機能層B側の面の位置と、前記着色層を有さない領域における前記コア層の前記機能層B側の面の位置とが、前記表面保護板の厚み方向において実質的に同一である、[1]に記載の表面保護板。
[3]前記表面保護板の背面側の最表面における、前記着色層を有する領域と前記着色層を有さない領域との境界の平均傾斜角が0.10度以下である、[1]又は[2]に記載の表面保護板。
[4]前記着色層を有する領域の全光線透過率が2%以下である、[1]~[3]の何れかに記載の表面保護板。
[5]前記着色層を有さない領域の全光線透過率が50%以上である、[1]~[4]の何れかに記載の表面保護板。
[6]前記機能層Bが、前記機能層Aとは異なる層を有する、[1]~[5]の何れかに記載の表面保護板。
[7]前記機能層Aがハードコート層Aを含み、前記機能層Bがハードコート層Bを含む、[1]~[6]の何れかに記載の表面保護板。
[8]前記ハードコート層Aの表面の算術平均粗さをRa-A、前記ハードコート層Bの表面の算術平均粗さをRa-Bと定義した際に、Ra-A>Ra-Bの関係を満たす、[7]に記載の表面保護板。
[9][1]~[8]の何れかに記載の表面保護板の背面側に、粘着層を介して、少なくとも1枚のプラスチックフィルムを有する機能性部材が積層されてなる、積層部材。
[10]前記機能性部材の最も表面保護板側に位置するプラスチックフィルムと、前記粘着層との間にガラスを有さない、[9]に記載の積層部材。
[11]前記機能性部材がタッチパネルである、[9]又は[10]に記載の積層部材。
[12]表示素子上に、[9]~[11]の何れかに記載の積層部材を有してなり、前記積層部材の前記機能性部材側の面が前記表示素子側を向くように配置してなる、画像表示装置。
[13]下記の工程(1)~(2)を有する、表面保護板の製造方法。
(1)一対の射出成形用金型の一方の側に、機能層Aを有してなる積層体Aを配置するとともに、前記金型の他方の側に、機能層Bを有し、前記機能層B上の一部に着色層を有してなる積層体Bを配置する工程。
(2)前記金型を締め、前記金型内に射出樹脂を注入し、前記積層体Aと、前記射出樹脂を含むコア層と、前記積層体Bとを密着させた積層体Xを得る工程。
[14]前記積層体Aが離型シート上に機能層Aを有してなる転写シートAであり、前記積層体Bが離型シート上に機能層Bを有し、前記機能層B上の一部に着色層を有してなる転写シートBであり、 前記積層体Xが前記転写シートAの離型シートとは反対側の面と、前記射出樹脂を含むコア層と、前記転写シートBの離型シートとは反対側の面とを密着させた積層体であり、さらに下記の工程(3)を有する、[13]に記載の表面保護板の製造方法。
(3)前記金型を開くとともに、前記積層体Xから転写シートAの離型シート及び転写シートBの離型シートを剥離する工程。
[15]前記積層体Aがフィルム層Aと機能層Aとを積層した積層フィルムAであり、前記積層体Bが離型シート上に機能層Bを有し、前記機能層B上の一部に着色層を有してなる転写シートBであり、前記積層体Xが、前記積層フィルムAの前記機能層Aとは反対側の面と、前記射出樹脂を含むコア層と、前記転写シートBの離型シートとは反対側の面とを密着させた積層体であり、さらに下記の工程(3)を有する、[13]に記載の表面保護板の製造方法。
(3)前記金型を開くとともに、前記積層体Xから転写シートBの離型シートを剥離する工程。
In order to solve the above problems, the present invention provides the following [1] to [15].
[1] From the front surface side to the back surface side, the functional layer A, the core layer containing a resin as a main component, and the functional layer B are provided in this order, and further, the surface of the core layer on the functional layer B side. A surface protective plate having a colored layer in part.
[2] The position of the surface of the colored layer on the functional layer B side and the position of the surface of the core layer on the functional layer B side in the region without the colored layer are in the thickness direction of the surface protective plate. The surface protective plate according to [1], which is substantially the same in the above.
[3] The average inclination angle of the boundary between the region having the colored layer and the region not having the colored layer on the outermost surface on the back surface side of the surface protective plate is 0.10 degrees or less, [1] or The surface protection plate according to [2].
[4] The surface protective plate according to any one of [1] to [3], wherein the total light transmittance of the region having the colored layer is 2% or less.
[5] The surface protective plate according to any one of [1] to [4], wherein the total light transmittance of the region having no colored layer is 50% or more.
[6] The surface protective plate according to any one of [1] to [5], wherein the functional layer B has a layer different from that of the functional layer A.
[7] The surface protective plate according to any one of [1] to [6], wherein the functional layer A contains a hard coat layer A and the functional layer B contains a hard coat layer B.
[8] When the arithmetic mean roughness of the surface of the hard coat layer A is defined as Ra-A and the arithmetic mean roughness of the surface of the hard coat layer B is defined as Ra-B, Ra-A> Ra-B. The surface protective plate according to [7], which satisfies the relationship.
[9] A laminated member in which a functional member having at least one plastic film is laminated on the back surface side of the surface protective plate according to any one of [1] to [8] via an adhesive layer.
[10] The laminated member according to [9], which has no glass between the plastic film located closest to the surface protective plate side of the functional member and the adhesive layer.
[11] The laminated member according to [9] or [10], wherein the functional member is a touch panel.
[12] The laminated member according to any one of [9] to [11] is provided on the display element, and the laminated member is arranged so that the surface of the laminated member on the functional member side faces the display element side. An image display device.
[13] A method for manufacturing a surface protective plate, which comprises the following steps (1) and (2).
(1) The laminated body A having the functional layer A is arranged on one side of the pair of injection molding dies, and the functional layer B is provided on the other side of the mold. A step of arranging a laminated body B having a colored layer on a part of the layer B.
(2) A step of tightening the mold and injecting an injection resin into the mold to obtain a laminate X in which the laminate A, a core layer containing the injection resin, and the laminate B are in close contact with each other. ..
[14] The laminated body A is a transfer sheet A having a functional layer A on a release sheet, and the laminated body B has a functional layer B on a release sheet and is on the functional layer B. A transfer sheet B having a partially colored layer, wherein the laminate X has a surface opposite to the release sheet of the transfer sheet A, a core layer containing the injection resin, and the transfer sheet B. The method for manufacturing a surface protective plate according to [13], which is a laminated body in which the surface opposite to the release sheet of No. 1 is in close contact with each other, and further has the following step (3).
(3) A step of opening the mold and peeling the release sheet of the transfer sheet A and the release sheet of the transfer sheet B from the laminate X.
[15] The laminated body A is a laminated film A in which a film layer A and a functional layer A are laminated, and the laminated body B has a functional layer B on a release sheet and is a part of the functional layer B. A transfer sheet B having a colored layer, wherein the laminated body X is a surface of the laminated film A opposite to the functional layer A, a core layer containing the injection resin, and the transfer sheet B. The method for manufacturing a surface protective plate according to [13], which is a laminated body in which the surface opposite to the release sheet of No. 1 is in close contact with each other, and further has the following step (3).
(3) A step of opening the mold and peeling the release sheet of the transfer sheet B from the laminated body X.
 本発明の表面保護板によれば、背面に粘着層を介してプラスチックフィルムを含む機能性部材を貼り合わせた際の視認性の低下を抑制することができる。また、本発明の表面保護板の製造方法は、前記表面保護板を簡易に製造することができる。また、本発明の積層部材及びこれを用いた画像表示装置は、視認性の低下を抑制することができる。 According to the surface protective plate of the present invention, it is possible to suppress a decrease in visibility when a functional member containing a plastic film is attached to the back surface via an adhesive layer. In addition, the method for manufacturing a surface protective plate of the present invention can easily manufacture the surface protective plate. Further, the laminated member of the present invention and the image display device using the laminated member can suppress a decrease in visibility.
本発明の表面保護板の一実施形態を示す断面図である。It is sectional drawing which shows one Embodiment of the surface protection plate of this invention. 従来の表面保護板の一例を示す断面図である。It is sectional drawing which shows an example of the conventional surface protection plate. 本発明の積層部材の一実施形態を示す断面図である。It is sectional drawing which shows one Embodiment of the laminated member of this invention. 従来の積層部材の一例を示す断面図である。It is sectional drawing which shows an example of the conventional laminated member. 本発明の表面保護板の一実施形態を示す平面図である。It is a top view which shows one Embodiment of the surface protection plate of this invention. 本発明の表面保護板の一実施形態を示す断面図である。It is sectional drawing which shows one Embodiment of the surface protection plate of this invention.
[表面保護板]
 本発明の表面保護板は、表面側から背面側に向けて、機能層A、樹脂を主成分とするコア層、機能層Bをこの順に有してなり、さらに、前記コア層の前記機能層B側の面の一部に着色層を有してなるものである。
[Surface protection plate]
The surface protective plate of the present invention has a functional layer A, a core layer containing a resin as a main component, and a functional layer B in this order from the front surface side to the back surface side, and further, the functional layer of the core layer. It has a colored layer on a part of the surface on the B side.
 図1は、本発明の表面保護板の一実施形態を示す断面図である。
 図1の表面保護板(100)は、表面側から背面側に向けて、機能層A(20A)、樹脂を主成分とするコア層(10)、機能層B(20B)をこの順に有している。また、図1の表面保護板(100)は、コア層(10)の機能層B(20B)側の面の一部に着色層(30)を有している。
 さらに、図1の表面保護板(100)は、表面保護板の背面側の最表面において、着色層(30)を有する領域(i)と、着色層(30)を有さない領域(ii)との境界(BL)に実質的に傾斜を有していない。
なお、本明細書において、「実質的に傾斜を有していない」とは、平面を含む概念である。
FIG. 1 is a cross-sectional view showing an embodiment of the surface protection plate of the present invention.
The surface protective plate (100) of FIG. 1 has a functional layer A (20A), a core layer (10) containing a resin as a main component, and a functional layer B (20B) in this order from the front surface side to the back surface side. ing. Further, the surface protective plate (100) of FIG. 1 has a colored layer (30) on a part of the surface of the core layer (10) on the functional layer B (20B) side.
Further, the surface protective plate (100) of FIG. 1 has a region (i) having a colored layer (30) and a region (ii) having no colored layer (30) on the outermost surface on the back surface side of the surface protective plate. There is virtually no slope at the boundary (BL) with.
In addition, in this specification, "substantially having no inclination" is a concept including a plane.
 図2は、従来の表面保護板の一例を示す断面図である。
 図2の表面保護板(100)は、例えば、コア層(10)と機能層B(20B)との間ではなく、機能層B(20B)のコア層(10)とは反対側に着色層(30)を有する点において、図1の本発明の表面保護板(100)と構成が相違している。
 さらに、図2の表面保護板(100)は、表面保護板の背面側の最表面において、着色層(30)を有する領域(i)と、着色層(30)を有さない領域(ii)との境界(BL)に傾斜を有している。
FIG. 2 is a cross-sectional view showing an example of a conventional surface protection plate.
The surface protective plate (100) of FIG. 2 is, for example, a colored layer not between the core layer (10) and the functional layer B (20B) but on the side opposite to the core layer (10) of the functional layer B (20B). The configuration is different from the surface protective plate (100) of the present invention in FIG. 1 in that it has (30).
Further, the surface protective plate (100) of FIG. 2 has a region (i) having a colored layer (30) and a region (ii) having no colored layer (30) on the outermost surface on the back surface side of the surface protective plate. It has a slope at the boundary (BL) with.
 図6は、本発明の表面保護板の一実施形態を示す断面図である。
 図6の表面保護板(100)は、表面側から背面側に向けて、機能層A(20A)、フィルム層A(24A)、樹脂を主成分とするコア層(10)、機能層B(20B)をこの順に有している。また、図6の表面保護板(100)は、コア層(10)の機能層B(20B)側の面の一部に着色層(30)を有している。また、図示はしていないが、機能層A(20A)とフィルム層A(24A)との間に、さらに、プライマー層を有してもよい。
 さらに、図6の表面保護板(100)は、表面保護板の背面側の最表面において、着色層(30)を有する領域(i)と、着色層(30)を有さない領域(ii)との境界(BL)に実質的に傾斜を有していない。
 なお、本明細書において、「実質的に傾斜を有していない」とは、平面を含む概念である。
FIG. 6 is a cross-sectional view showing an embodiment of the surface protection plate of the present invention.
The surface protective plate (100) of FIG. 6 has a functional layer A (20A), a film layer A (24A), a core layer (10) containing a resin as a main component, and a functional layer B (from the front surface side to the back surface side). 20B) are provided in this order. Further, the surface protective plate (100) of FIG. 6 has a colored layer (30) on a part of the surface of the core layer (10) on the functional layer B (20B) side. Further, although not shown, a primer layer may be further provided between the functional layer A (20A) and the film layer A (24A).
Further, the surface protective plate (100) of FIG. 6 has a region (i) having a colored layer (30) and a region (ii) having no colored layer (30) on the outermost surface on the back surface side of the surface protective plate. There is virtually no slope at the boundary (BL) with.
In addition, in this specification, "substantially having no inclination" is a concept including a plane.
 本発明の表面保護板は、コア層の機能層B側の面の一部に着色層を有する(言い換えると、コア層と機能層Bとの間に着色層を有する)ことによって、表面保護板の背面側の最表面において、着色層を有する領域と、着色層を有さない領域との境界に傾斜が生じることを抑制することができ、ひいては、表面保護板の背面に粘着層を介してプラスチックフィルムを含む機能性部材を貼り合わせた際に、視認性の低下を抑制することができる。
 着色層を有する領域と、着色層を有さない領域との境界に大きな傾斜が存在する際に視認性が低下する原因は、プラスチックフィルムに該傾斜が反映され(図4参照)、プラスチックフィルムの光軸が部分的に変化するためと考えられる。なお、コア層よりも表面側に着色層を配置すれば前述のような不具合は生じないが、奥行き感が低下するため、表面保護板全体としての高級感を良好にすることができない。
 一方、着色層を有する領域と、着色層を有さない領域との境界に傾斜が実質的に存在しない場合、表面保護板の背面側にプラスチックフィルムを含む機能性部材を貼り合わせても、プラスチックフィルムの光軸の変化が抑制されるため、視認性の低下を抑制できると考えられる(図3参照)。また、着色層を有する領域と、着色層を有さない領域との境界に傾斜が実質的に存在しない場合、表面保護板の背面にプラスチックフィルムを含む機能性部材を貼り合わせた際に、気泡の混入を抑制しやすい点でも好ましい。
The surface protective plate of the present invention has a colored layer on a part of the surface of the core layer on the functional layer B side (in other words, has a colored layer between the core layer and the functional layer B). On the outermost surface on the back surface side of the surface, it is possible to prevent the boundary between the region having the colored layer and the region not having the colored layer from being inclined, and by extension, the back surface of the surface protective plate is provided with an adhesive layer. When a functional member including a plastic film is attached, a decrease in visibility can be suppressed.
The reason why the visibility is lowered when there is a large inclination at the boundary between the region having the colored layer and the region not having the colored layer is that the inclination is reflected in the plastic film (see FIG. 4). This is probably because the optical axis changes partially. If the colored layer is arranged on the surface side of the core layer, the above-mentioned problems do not occur, but the sense of depth is reduced, so that the overall sense of quality of the surface protective plate cannot be improved.
On the other hand, when there is substantially no inclination at the boundary between the region having the colored layer and the region not having the colored layer, even if a functional member containing a plastic film is attached to the back side of the surface protective plate, the plastic is used. Since the change in the optical axis of the film is suppressed, it is considered that the decrease in visibility can be suppressed (see FIG. 3). Further, when there is substantially no inclination at the boundary between the region having the colored layer and the region not having the colored layer, when a functional member containing a plastic film is attached to the back surface of the surface protective plate, air bubbles are generated. It is also preferable in that it is easy to suppress the mixing of.
 本発明の表面保護板の一実施形態は、着色層の機能層B側の面の位置と、着色層を有さない領域におけるコア層の機能層B側の面の位置とが、表面保護板の厚み方向において実質的に同一であることが好ましい。かかる構成を備えることにより、表面保護板の背面側の最表面において、着色層を有する領域と、着色層を有さない領域との境界の傾斜を実質的になくすことができ、表面保護板の背面にプラスチックフィルムを含む機能性部材を貼り合わせた際に、視認性が低下することをより抑制したり、気泡が混入することを抑制したりすることができる。 In one embodiment of the surface protective plate of the present invention, the position of the surface of the colored layer on the functional layer B side and the position of the surface of the core layer on the functional layer B side in the region without the colored layer are set as the surface protective plate. It is preferable that they are substantially the same in the thickness direction of. By providing such a configuration, it is possible to substantially eliminate the inclination of the boundary between the region having the colored layer and the region not having the colored layer on the outermost surface on the back surface side of the surface protective plate. When a functional member containing a plastic film is attached to the back surface, it is possible to further suppress the deterioration of visibility and suppress the mixing of air bubbles.
 着色層の機能層B側の面の位置と、着色層を有さない領域におけるコア層の機能層B側の面の位置とを、表面保護板の厚み方向において実質的に同一とする手段としては、例えば、後述するインモールド成形等の射出成形が挙げられる。インモールド成形等の射出成型では、型内において、着色層及び機能層Bを含む転写シートとコア層を形成する射出樹脂とが高い圧力で密着するため、上記構成を実現しやすくできる。
 さらに、インモールド成形等の射出成形では、着色層及び機能層Bを含む転写シートとコア層を形成する高温の射出樹脂とが高い圧力で密着することにより、着色層とコア層との界面で、着色層の一部とコア層の一部とが溶融し、一体化しやすくなる。このように、着色層とコア層との界面で着色層の一部とコア層の一部とが一体化しやすくなることで、着色層とコア層との界面における密着性が向上しやすくなり、より強固な表面保護板を作製することができる。
 なお、着色層及び機能層Bを含む転写シートを用いた場合でも、インモールド成形等の射出成形以外の手法では、上記構成を実現しにくい。例えば、あらかじめ成形したコア層上に、着色層及び機能層Bを含む転写シートを配置し、熱ロールを押し当て、コア層と転写シートを密着させた後、転写シートの離型シートを剥離する手法では、コア層に着色層が殆どめり込まず、上記構成を実現しにくい。
As a means for making the position of the surface of the colored layer on the functional layer B side and the position of the surface of the core layer on the functional layer B side in the region without the colored layer substantially the same in the thickness direction of the surface protective plate. For example, injection molding such as in-mold molding described later can be mentioned. In injection molding such as in-mold molding, the transfer sheet containing the colored layer and the functional layer B and the injection resin forming the core layer adhere to each other at a high pressure in the mold, so that the above configuration can be easily realized.
Further, in injection molding such as in-mold molding, the transfer sheet containing the colored layer and the functional layer B and the high-temperature injection resin forming the core layer adhere to each other at a high pressure, so that the colored layer and the core layer are in close contact with each other at the interface between the colored layer and the core layer. , A part of the colored layer and a part of the core layer are melted, and it becomes easy to integrate them. In this way, at the interface between the colored layer and the core layer, a part of the colored layer and a part of the core layer are easily integrated, so that the adhesion at the interface between the colored layer and the core layer is easily improved. A stronger surface protection plate can be produced.
Even when a transfer sheet containing a colored layer and a functional layer B is used, it is difficult to realize the above configuration by a method other than injection molding such as in-mold molding. For example, a transfer sheet containing a colored layer and a functional layer B is placed on a preformed core layer, a heat roll is pressed against the core layer, the core layer and the transfer sheet are brought into close contact with each other, and then the release sheet of the transfer sheet is peeled off. In the method, the colored layer hardly penetrates into the core layer, and it is difficult to realize the above configuration.
 本明細書において、「着色層の機能層B側の面の位置と、着色層を有さない領域におけるコア層の機能層B側の面の位置とが、表面保護板の厚み方向において実質的に同一である」とは、表面保護板を垂直に切断した断面をSEM等で画像観察した際に、着色層の機能層B側の面の位置と、着色層を有さない領域におけるコア層の機能層B側の面の位置との高低差が1.0μm以下であることを意味し、好ましくは0.5μm以下、より好ましくは0.2μm以下である。表面保護板が曲面形状の場合、曲面を基準として前述した高低差を判断するものとする。 In the present specification, "the position of the surface of the colored layer on the functional layer B side and the position of the surface of the core layer on the functional layer B side in the region without the colored layer are substantially in the thickness direction of the surface protective plate. "Is the same as" means that when the cross section of the surface protection plate cut vertically is observed by SEM or the like, the position of the surface of the colored layer on the functional layer B side and the core layer in the region without the colored layer. This means that the height difference from the position of the surface on the functional layer B side is 1.0 μm or less, preferably 0.5 μm or less, and more preferably 0.2 μm or less. When the surface protective plate has a curved surface shape, the above-mentioned height difference shall be determined based on the curved surface.
 本発明の表面保護板の一実施形態は、表面保護板の厚み方向における、コア層と着色層のとの厚み比(コア層の厚み/着色層の厚み)が、100以上であることが好ましく、200以上であることがより好ましく、500以上であることがさらに好ましく、1000以上であることが特に好ましい。前記厚み比が100以上であることで、射出成型の際に、着色層及び機能層Bを含む転写シートとコア層を形成する射出樹脂とが高い圧力で密着しやすくなるため、表面保護板の背面側の最表面において、着色層を有する領域と、着色層を有さない領域との境界の傾斜を実質的になくしやすくすることができる。
 なお、前記厚み比の上限値については特に限定はされないが、通常は20000以下が好ましく、10000以下がより好ましい。
In one embodiment of the surface protection plate of the present invention, the thickness ratio of the core layer to the colored layer (thickness of the core layer / thickness of the colored layer) in the thickness direction of the surface protection plate is preferably 100 or more. , 200 or more, more preferably 500 or more, and particularly preferably 1000 or more. When the thickness ratio is 100 or more, the transfer sheet containing the colored layer and the functional layer B and the injection resin forming the core layer can easily adhere to each other at a high pressure during injection molding. On the outermost surface on the back surface side, it is possible to substantially eliminate the inclination of the boundary between the region having the colored layer and the region not having the colored layer.
The upper limit of the thickness ratio is not particularly limited, but is usually preferably 20000 or less, and more preferably 10000 or less.
 本発明の表面保護板の一実施形態は、表面保護板の背面側の最表面における、着色層を有する領域と前記着色層を有さない領域との境界の平均傾斜角が0.10度以下であることが好ましく、0.07度以下であることがより好ましく、0.05度以下であることがさらに好ましく、0.03度以下であることがよりさらに好ましい。
 前記平均傾斜角を0.10度以下とすることにより、表面保護板の背面にプラスチックフィルムを含む機能性部材を貼り合わせた際に、視認性が低下することをより抑制したり、気泡が混入することを抑制したりすることができる。
In one embodiment of the surface protection plate of the present invention, the average inclination angle of the boundary between the region having the colored layer and the region not having the colored layer on the outermost surface on the back surface side of the surface protection plate is 0.10 degrees or less. It is more preferably 0.07 degrees or less, further preferably 0.05 degrees or less, and even more preferably 0.03 degrees or less.
By setting the average inclination angle to 0.10 degrees or less, when a functional member containing a plastic film is attached to the back surface of the surface protective plate, it is possible to further suppress the deterioration of visibility or to mix air bubbles. It can be suppressed.
 本明細書において、平均傾斜角は下記(1)~(3)で算出したものとする。なお、表面保護板が曲面形状を有する場合、下記(1)~(3)における平均傾斜角の算出の際には、最小二乗関数による補正を行うものとする。平均傾斜角は、例えば、白色干渉式の表面形状測定器により測定することができる。
(1)表面保護板の背面の表面形状を測定する。表面形状の測定領域は、少なくとも、着色層を有する領域と着色層を有さない領域との境界を含む200μm四方以上の領域とする。ここで測定される表面形状は、200μm四方以上の領域の三次元形状である。
(2)前記(1)で測定した表面形状(200μm四方以上の領域の三次元形状)から、着色層を有する領域と着色層を有さない領域との境界(図1及び図2のBL)を中心とした幅100μmの断面プロファイルを20箇所取得する。断面プロファイルとは、図1及び図2でいうとXZ方向の断面プロファイルを意味する。
(3)各断面プロファイルから平均傾斜角を算出し、最大値及び最小値を切り捨てた18箇所の平均傾斜角の平均を、各表面保護板の境界の平均傾斜角とする。
In the present specification, the average inclination angle is calculated by the following (1) to (3). When the surface protection plate has a curved surface shape, the correction by the least squares function shall be performed when calculating the average inclination angle in the following (1) to (3). The average inclination angle can be measured by, for example, a white interference type surface shape measuring device.
(1) Measure the surface shape of the back surface of the surface protection plate. The surface shape measurement region shall be at least a region of 200 μm square or more including the boundary between the region having the colored layer and the region not having the colored layer. The surface shape measured here is a three-dimensional shape in a region of 200 μm square or more.
(2) From the surface shape measured in (1) above (three-dimensional shape of a region of 200 μm square or more), the boundary between the region having a colored layer and the region not having a colored layer (BL in FIGS. 1 and 2). Acquire 20 cross-sectional profiles having a width of 100 μm centered on the above. The cross-sectional profile means a cross-sectional profile in the XZ direction in FIGS. 1 and 2.
(3) The average inclination angle is calculated from each cross-sectional profile, and the average of the average inclination angles of 18 places where the maximum value and the minimum value are rounded off is taken as the average inclination angle of the boundary of each surface protection plate.
 本発明の表面保護板の一実施形態は、表面保護板の背面側の最表面における、着色層を有する領域と前記着色層を有さない領域との境界の断面プロファイルの標高の最大値と最小値との差(PV)の平均が1.0μm以下であることが好ましく、0.7μm以下であることがより好ましく、0.5μm以下であることがさらに好ましく、0.3μm以下であることがよりさらに好ましい。
 PVの平均を1.0μm以下とすることにより、表面保護板の背面にプラスチックフィルムを含む機能性部材を貼り合わせた際に、視認性が低下することをより抑制したり、気泡が混入することを抑制したりすることができる。
In one embodiment of the surface protective plate of the present invention, the maximum and minimum elevations of the cross-sectional profile of the boundary between the region having the colored layer and the region not having the colored layer on the outermost surface on the back surface side of the surface protective plate. The average difference (PV) from the value is preferably 1.0 μm or less, more preferably 0.7 μm or less, further preferably 0.5 μm or less, and preferably 0.3 μm or less. Even more preferable.
By setting the average PV to 1.0 μm or less, when a functional member containing a plastic film is attached to the back surface of the surface protective plate, it is possible to further suppress the deterioration of visibility and to mix air bubbles. Can be suppressed.
 PVの平均は、平均傾斜角と略同一の手法で算出できる。具体的には、平均傾斜角の算出手法の(1)及び(2)と、下記(3’)とでPVの平均を算出できる。なお、表面保護板が曲面形状を有する場合、最小二乗関数による補正を行うものとする。
(3’)各断面プロファイルから、標高の最大値と最小値との差(PV)を算出し、最大値及び最小値を切り捨てた18箇所のPVの平均を、各表面保護板の境界のPVの平均とする。
The average of PV can be calculated by substantially the same method as the average inclination angle. Specifically, the average of PV can be calculated by the methods (1) and (2) for calculating the average inclination angle and the following (3'). If the surface protection plate has a curved surface shape, the correction is performed by the least squares function.
(3') From each cross-sectional profile, the difference (PV) between the maximum and minimum altitude values is calculated, and the average of 18 PVs with the maximum and minimum values rounded down is calculated as the PV at the boundary of each surface protection plate. Is the average of.
 本発明の表面保護板の一実施形態は、着色層によって隠蔽性を付与しやすくする観点から、着色層を有する領域の全光線透過率が2%以下であることが好ましく、0.5%以下であることがより好ましく、0.04%以下であることがさらに好ましく、0.0008%以下であることがよりさらに好ましい。 In one embodiment of the surface protection plate of the present invention, the total light transmittance of the region having the colored layer is preferably 2% or less, preferably 0.5% or less, from the viewpoint of facilitating the concealment property by the colored layer. It is more preferably 0.04% or less, and even more preferably 0.0008% or less.
 本発明の表面保護板の一実施形態は、表面保護板の背面を視認しやすくする観点から、着色層を有さない領域の全光線透過率が50%以上であることが好ましく、80%以上であることがより好ましく、90%以上であることがさらに好ましい。 In one embodiment of the surface protective plate of the present invention, the total light transmittance of the region having no colored layer is preferably 50% or more, and 80% or more, from the viewpoint of making the back surface of the surface protective plate easy to see. Is more preferable, and 90% or more is further preferable.
 本明細書において、全光線透過率とは、JIS K7361-1:1997で規定する全光線透過率を意味し、20箇所測定した際の平均値とする。 In the present specification, the total light transmittance means the total light transmittance specified in JIS K7361-1: 1997, and is an average value when 20 points are measured.
 本発明の表面保護板の一実施形態は、表面側(機能層A側)の鉛筆硬度をP-A、背面側(機能層B側)の鉛筆硬度をP-Bと定義した際、P-A>P-Bの関係を満たすことが好ましい。
 P-A>P-Bの関係を満たすことにより、耐擦傷性が重要である表面側(機能層A側)の耐擦傷性を良好にしやすくできる一方で、背面側(機能層B側)に関しては、機能層Bに隣接する層との密着性を良好にしやすくできる。
In one embodiment of the surface protection plate of the present invention, when the pencil hardness on the front surface side (functional layer A side) is defined as PA and the pencil hardness on the back surface side (functional layer B side) is defined as PA, P- It is preferable to satisfy the relationship of A> BP.
By satisfying the relationship of PA> BP, it is possible to easily improve the scratch resistance on the front side (functional layer A side) where scratch resistance is important, while on the back side (functional layer B side). Can facilitate good adhesion to the layer adjacent to the functional layer B.
 表面側(機能層A側)の鉛筆硬度は、H以上であることが好ましく、2H以上であることがより好ましく、3H以上であることがさらに好ましい。また、背面側(機能層B側)の鉛筆硬度は、3B~2Hであることが好ましく、2B~Hであることがより好ましい。
 なお、本明細書において、鉛筆硬度は、JIS K5600-5-4:1999に規定する鉛筆硬度試験(4.9N荷重)を行い、傷のつかなかった最も高い硬度に基づくものである。
The pencil hardness on the surface side (functional layer A side) is preferably H or more, more preferably 2H or more, and even more preferably 3H or more. The pencil hardness on the back surface side (functional layer B side) is preferably 3B to 2H, and more preferably 2B to H.
In this specification, the pencil hardness is based on the highest hardness that has not been scratched by performing the pencil hardness test (4.9 N load) specified in JIS K5600-5-4: 1999.
 本発明の表面保護板の表面側の面の反射率が、背面側の面の反射率よりも低いことが好ましい。表面保護板の表面側の面の反射率が、背面側の面の反射率より低いことで、表面保護板の表面の反射をより抑制しやすくできる。
 本明細書において、反射率は視感反射率Y値のことをいう。反射率を測定する際は、表面保護板の被測定面とは反対側の面に、透明粘着剤層を介して黒色板を貼り合わせたサンプルを作製し、該サンプルの被測定面側から入射角5°で光を入射させて測定するものとする。反射率を測定する際の光源はD65とすることが好ましい。
 サンプルの透明粘着剤層と接する部材(例えばハードコート層B)と、透明粘着剤層との屈折率差は0.15以内とすることが好ましく、0.10以内とすることがより好ましく、0.05以内とすることがさらに好ましい。また、黒色板は、JIS K7361-1:1997の全光線透過率が1%以下のものが好ましく、0%のものがより好ましい。また、黒色板を構成する樹脂の屈折率と、透明粘着剤層との屈折率差は0.15以内とすることが好ましく、0.10以内とすることがより好ましく、0.05以内とすることがさらに好ましい。
It is preferable that the reflectance of the surface side surface of the surface protective plate of the present invention is lower than the reflectance of the back surface side surface. Since the reflectance of the surface side surface of the surface protection plate is lower than the reflectance of the back surface side surface, it is possible to more easily suppress the reflection on the surface of the surface protection plate.
In the present specification, the reflectance refers to the visual reflectance Y value. When measuring the reflectance, a sample is prepared in which a black plate is attached to the surface of the surface protective plate opposite to the surface to be measured via a transparent adhesive layer, and the sample is incident from the surface to be measured. It is assumed that light is incident at an angle of 5 ° for measurement. The light source for measuring the reflectance is preferably D65.
The difference in refractive index between the member in contact with the transparent pressure-sensitive adhesive layer of the sample (for example, the hard coat layer B) and the transparent pressure-sensitive adhesive layer is preferably 0.15 or less, more preferably 0.10 or less, and 0. It is more preferably within .05. Further, the black plate preferably has a total light transmittance of JIS K7361-1: 1997 of 1% or less, and more preferably 0%. Further, the difference in the refractive index between the refractive index of the resin constituting the black plate and the transparent pressure-sensitive adhesive layer is preferably 0.15 or less, more preferably 0.10 or less, and more preferably 0.05 or less. Is even more preferable.
<コア層>
 コア層は樹脂を主成分とするものである。主成分とは、コア層を構成する全固形分の50質量%以上を意味し、好ましくは70質量%以上、より好ましくは90質量%以上、さらに好ましくは95質量%以上、よりさらに好ましくは99質量%以上である。
<Core layer>
The core layer is mainly composed of resin. The main component means 50% by mass or more of the total solid content constituting the core layer, preferably 70% by mass or more, more preferably 90% by mass or more, still more preferably 95% by mass or more, still more preferably 99. It is mass% or more.
 コア層の樹脂は、インモールド成形等の射出成形の容易性の観点から熱可塑性樹脂が好ましい。
 コア層の樹脂を熱可塑性樹脂にすることで、インモールド成形等の射出成形をする際に、コア層の樹脂を高温、高圧で射出することができるため、着色層及び機能層Bを含む転写シートとコア層の樹脂とをより密着しやすくすることができ、さらに着色層とコア層との界面で、着色層の一部とコア層の一部とが溶融し一体化しやすくなる。このように、着色層とコア層との界面で着色層の一部とコア層の一部とが一体化しやすくなることで、着色層とコア層との界面における密着性が向上しやすくなり、より強固な表面保護板を作製することができる。
 熱可塑性樹脂としては、ポリスチレン系樹脂、ポリオレフィン系樹脂、ABS樹脂、AS樹脂、AN樹脂、ポリフェニレンオキサイド系樹脂、ポリカーボネート系樹脂、ポリアセタール系樹脂、アクリル系樹脂、ポリエチレンテレフタレート系樹脂、ポリブチレンテフタレート系樹脂、ポリスルフォン系樹脂、およびポリフェニレンサルファイド系樹脂から選ばれる1種または混合物等が挙げられる。これらの中でもポリカーボネート系樹脂及びアクリル系樹脂が好ましく、耐衝撃性に優れるポリカーボネート系樹脂がより好ましい。
The resin of the core layer is preferably a thermoplastic resin from the viewpoint of ease of injection molding such as in-mold molding.
By changing the resin of the core layer to a thermoplastic resin, the resin of the core layer can be injected at a high temperature and high pressure at the time of injection molding such as in-mold molding, so that the transfer including the colored layer and the functional layer B can be performed. The sheet and the resin of the core layer can be more easily adhered to each other, and at the interface between the colored layer and the core layer, a part of the colored layer and a part of the core layer are easily melted and integrated. In this way, at the interface between the colored layer and the core layer, a part of the colored layer and a part of the core layer are easily integrated, so that the adhesion at the interface between the colored layer and the core layer is easily improved. A stronger surface protection plate can be produced.
The thermoplastic resins include polystyrene-based resins, polyolefin-based resins, ABS resins, AS resins, AN resins, polyphenylene oxide-based resins, polycarbonate-based resins, polyacetal-based resins, acrylic-based resins, polyethylene terephthalate-based resins, and polybutylene tephthalate-based resins. Examples thereof include one or a mixture selected from resins, polysulfone-based resins, and polyphenylene sulfide-based resins. Among these, polycarbonate-based resins and acrylic-based resins are preferable, and polycarbonate-based resins having excellent impact resistance are more preferable.
 コア層の波長589nmにおける面内リタデーションは、300nm以下であることが好ましく、200nm以下であることがより好ましい。面内リタデーションを前記範囲とすることにより、液晶表示装置等の画面を表面保護板及び偏光サングラスを介して観察した際に、虹状のムラが視認されることを抑制できる。
 面内リタデーション(Re)は、コア層の面内において最も屈折率が大きい方向(遅相軸方向)の屈折率(nx)と、遅相軸方向と直交する方向(進相軸方向)の屈折率(ny)と、コア層の厚み(d)(nm)とにより、以下の式(1)によって表されるものである。 
 Re=(nx-ny)×d  ・・・(1)
 面内リタデーションは、例えば、王子計測機器株式会社製KOBRA-WRによって測定することができる。
The in-plane retardation of the core layer at a wavelength of 589 nm is preferably 300 nm or less, more preferably 200 nm or less. By setting the in-plane retardation within the above range, it is possible to prevent the rainbow-shaped unevenness from being visually recognized when the screen of the liquid crystal display device or the like is observed through the surface protective plate and the polarized sunglasses.
In-plane retardation (Re) is the refractive index (nx) in the direction with the largest refractive index in the plane of the core layer (slow phase axis direction) and the refraction in the direction orthogonal to the slow phase axis direction (phase advance axis direction). It is expressed by the following formula (1) according to the rate (ny) and the thickness (d) (nm) of the core layer.
Re = (nx-ny) x d ... (1)
The in-plane retardation can be measured by, for example, KOBRA-WR manufactured by Oji Measuring Instruments Co., Ltd.
 コア層の面内リタデーションを上記範囲とするためには、リタデーションが生じにくい樹脂を用いたり、コア層内で樹脂の分子が特定の方向に配向しないようにしたりすることが好ましい。コア層の樹脂としてポリカーボネート系樹脂を用い、かつ、ポリカーボネート系樹脂を射出成形する場合には、型内における溶融ポリカーボネート系樹脂の流れが特定の方向に偏らないようにすることが好ましい。 In order to keep the in-plane retardation of the core layer within the above range, it is preferable to use a resin in which retardation is unlikely to occur, or to prevent the resin molecules from being oriented in a specific direction in the core layer. When a polycarbonate-based resin is used as the resin of the core layer and the polycarbonate-based resin is injection-molded, it is preferable that the flow of the molten polycarbonate-based resin in the mold is not biased in a specific direction.
 コア層は、必要に応じて、紫外線吸収剤、光安定剤、酸化防止剤及び難燃剤等の添加剤を含有してもよい。 The core layer may contain additives such as an ultraviolet absorber, a light stabilizer, an antioxidant and a flame retardant, if necessary.
 コア層の厚みは特に限定されないが、通常、1mm以上であり、1~10mmであることが好ましい。
 本明細書において、表面保護板を構成する各層(コア層、着色層等)の厚みは、表面保護板の垂直断面を電子顕微鏡等で観察した際の任意の20箇所の平均値として算出したものとする。
The thickness of the core layer is not particularly limited, but is usually 1 mm or more, preferably 1 to 10 mm.
In the present specification, the thickness of each layer (core layer, colored layer, etc.) constituting the surface protective plate is calculated as an average value of 20 arbitrary points when the vertical cross section of the surface protective plate is observed with an electron microscope or the like. And.
<着色層>
 本発明の表面保護板は、コア層の機能層B側の面の一部に着色層を有する。上述したように、コア層の機能層B側(言い換えると、コア層よりも背面側)に着色層を有することにより、奥行き感に基づく高級感を付与することができる。
<Colored layer>
The surface protective plate of the present invention has a colored layer on a part of the surface of the core layer on the functional layer B side. As described above, by having the colored layer on the functional layer B side (in other words, the back side of the core layer) of the core layer, it is possible to give a high-class feeling based on a sense of depth.
 着色層は、バインダー樹脂及び着色剤を含むことが好ましい。
 着色層のバインダー樹脂は、コア層及び機能層Bとの密着性を良好にする観点から、熱可塑性樹脂であることが好ましい。着色層のバインダー樹脂としての熱可塑性樹脂は、コア層の熱可塑性樹脂として例示したものと同様のものが挙げられる。
 着色層の着色剤は、汎用の顔料及び染料が挙げられ、隠蔽性を良好にする観点から顔料が好ましい。
 バインダー樹脂と着色剤との配合割合は、着色層の塗膜強度及び隠蔽性等のバランスを考慮して適宜調整すればよい。
The colored layer preferably contains a binder resin and a colorant.
The binder resin of the colored layer is preferably a thermoplastic resin from the viewpoint of improving the adhesion to the core layer and the functional layer B. Examples of the thermoplastic resin as the binder resin of the colored layer include those similar to those exemplified as the thermoplastic resin of the core layer.
Examples of the colorant of the coloring layer include general-purpose pigments and dyes, and pigments are preferable from the viewpoint of improving hiding power.
The blending ratio of the binder resin and the colorant may be appropriately adjusted in consideration of the balance between the coating film strength and the hiding power of the colored layer.
 着色層のパターンは任意であり、ベタ印刷であってもよいし、文字、数字、円、楕円、四角形、多角形、幾何学模様、木目、石目、布目及び砂目等の任意のパターンであってもよい。また、ベタ印刷の一部を抜き、抜いた部分によって、文字、数字、円、楕円、四角形、多角形及び幾何学模様等の任意のパターンを表示するものであってもよい。また、着色層は、表面保護板を平面視した際の縁部分の全部又は一部に形成されるようにパターニングしてもよく、縁部分の全部に形成されるようにパターニングすることが好ましい。図5は、縁部分の全部に着色層30を形成した表面保護板を平面視した透過図である。縁部分の幅は特に限定されないが、通常1~20mm程度であり、好ましくは2~10mmである。
 着色層の色は任意であるが、黒及び茶等の暗色系の色であることが好ましい。
The pattern of the colored layer is arbitrary and may be solid printing, or any pattern such as letters, numbers, circles, ovals, quadrangles, polygons, geometric patterns, wood grain, stone grain, cloth grain and sand grain. There may be. Further, a part of the solid printing may be removed, and an arbitrary pattern such as a character, a number, a circle, an ellipse, a quadrangle, a polygon, or a geometric pattern may be displayed depending on the removed part. Further, the colored layer may be patterned so as to be formed on all or a part of the edge portion when the surface protective plate is viewed in a plan view, and it is preferable to pattern the colored layer so as to be formed on the entire edge portion. FIG. 5 is a transparent view of a surface protective plate having a colored layer 30 formed on the entire edge portion in a plan view. The width of the edge portion is not particularly limited, but is usually about 1 to 20 mm, preferably 2 to 10 mm.
The color of the colored layer is arbitrary, but it is preferably a dark color such as black or brown.
 表面保護板の全面積に占める着色層の面積割合は特に限定されず、目的に応じて適宜調整すればよい。多くの場合、前記面積割合は20~80%程度である。 The area ratio of the colored layer to the total area of the surface protection plate is not particularly limited, and may be appropriately adjusted according to the purpose. In many cases, the area ratio is about 20 to 80%.
 着色層の厚み(T1)は、隠蔽性と表面保護板の薄膜化とのバランスの観点から、0.5~10μmであることが好ましく、1~5μmであることがより好ましく、2~4μmであることがさらに好ましい。 The thickness (T1) of the colored layer is preferably 0.5 to 10 μm, more preferably 1 to 5 μm, and 2 to 4 μm from the viewpoint of the balance between the hiding property and the thinning of the surface protection plate. It is more preferable to have.
 着色層全体の厚みの平均(T1)と、着色層のエッジから100μmの領域の厚みの平均(T2)とは、0.85≦T2/T1≦1.00を満たすことが好ましく、0.90≦T2/T1≦1.00を満たすことがより好ましく、0.95≦T2/T1≦1.00を満たすことがさらに好ましい。
 T2/T1を前記範囲とすることにより、着色層のエッジがシャープとなり、意匠性を良好にしやすくできる。なお、T2/T1を前記範囲とした場合、表面保護板の背面にプラスチックフィルムを含む機能性部材を貼り合わせた際の視認性に関して不利となるが、本発明の表面保護板の構成を採用すること、好ましくは本発明の表面保護板の好適な実施形態の構成を採用することにより、視認性の低下を抑制しやすくできる。
The average thickness of the entire colored layer (T1) and the average thickness of the region 100 μm from the edge of the colored layer (T2) preferably satisfy 0.85 ≦ T2 / T1 ≦ 1.00, and 0.90. It is more preferable to satisfy ≦ T2 / T1 ≦ 1.00, and further preferably to satisfy 0.95 ≦ T2 / T1 ≦ 1.00.
By setting T2 / T1 in the above range, the edge of the colored layer becomes sharp, and the design can be easily improved. When T2 / T1 is within the above range, it is disadvantageous in terms of visibility when a functional member containing a plastic film is attached to the back surface of the surface protective plate, but the configuration of the surface protective plate of the present invention is adopted. That is, preferably, by adopting the configuration of a preferred embodiment of the surface protective plate of the present invention, it is possible to easily suppress a decrease in visibility.
 T2/T1を前記範囲とするためには、「着色層を含む転写シートによってコア層に着色層を転写すること」、及び、「転写シートの機能層B上の一部に着色層を形成する際に、固形の着色層(例えばインクリボン)を溶融熱転写して形成すること」が好ましい。なお、塗布方式で着色層を形成した場合、着色層のエッジはなだらかとなるため、T2/T1を前記範囲とすることは困難である。 In order to set T2 / T1 in the above range, "transferring the colored layer to the core layer by a transfer sheet containing a colored layer" and "forming a colored layer on a part of the functional layer B of the transfer sheet". At that time, it is preferable to form a solid colored layer (for example, an ink ribbon) by melt heat transfer. When the colored layer is formed by the coating method, the edge of the colored layer becomes gentle, so it is difficult to set T2 / T1 in the above range.
<機能層>
 本発明の表面保護板は、コア層の表面側に機能層Aを有し、コア層の背面側に機能層Bを有する。機能層A及び機能層Bは、それぞれ単層構成であってもよいし、多層構成であってもよい。
 なお、以下、特に断らない限り、「機能層」と表記した場合、機能層A及び機能層Bの両方を指すものとする。
<Functional layer>
The surface protective plate of the present invention has a functional layer A on the front surface side of the core layer and a functional layer B on the back surface side of the core layer. The functional layer A and the functional layer B may each have a single-layer structure or a multi-layer structure.
Hereinafter, unless otherwise specified, the term "functional layer" refers to both functional layer A and functional layer B.
 機能層A及び機能層Bの構成は同一であってもよいし、異なっていてもよいが、異なることが好ましい。すなわち、機能層Bは機能層Aとは異なる層を有することが好ましい。
 「異なる層」としては、樹脂組成が異なる層、表面形状が異なる層、厚みが異なる層などが挙げられる。機能層Aと機能層Bとの構成を異なるものとするには、後述する両面同時インモールド成形等の射出成形が効率的である。
The configurations of the functional layer A and the functional layer B may be the same or different, but are preferably different. That is, it is preferable that the functional layer B has a layer different from that of the functional layer A.
Examples of the "different layer" include a layer having a different resin composition, a layer having a different surface shape, and a layer having a different thickness. In order to make the configurations of the functional layer A and the functional layer B different, injection molding such as double-sided simultaneous in-mold molding, which will be described later, is efficient.
 機能層Aは、表面の耐擦傷性の観点からハードコート層Aを有することが好ましい。
 同様に、機能層Bは、裏面の耐擦傷性の観点からハードコート層Bを有することが好ましい。なお、機能層Bがハードコート層Bを有することにより、機能層Bがバリア層として機能し、コア層及び/又は粘着層(表面保護板の背面にプラスチックフィルムを含む機能性部材を貼り合わせる際に用いる粘着層)から生じた成分が拡散することを抑制し得る点で好ましい。なお、コア層及び粘着層から生じる成分としては、これらの層に含まれる低分子成分や、残留溶剤に起因するガス等が挙げられる。
The functional layer A preferably has a hard coat layer A from the viewpoint of surface scratch resistance.
Similarly, the functional layer B preferably has a hard coat layer B from the viewpoint of scratch resistance on the back surface. Since the functional layer B has the hard coat layer B, the functional layer B functions as a barrier layer, and when the core layer and / or the adhesive layer (when a functional member containing a plastic film is attached to the back surface of the surface protective plate). It is preferable in that it can suppress the diffusion of the components generated from the adhesive layer (adhesive layer used in). Examples of the components generated from the core layer and the adhesive layer include low molecular weight components contained in these layers, gas caused by a residual solvent, and the like.
 ハードコート層Aの表面の算術平均粗さをRa-A、ハードコート層Bの表面の算術平均粗さをRa-Bと定義した際に、Ra-A>Ra-Bの関係を満たすことが好ましい。
 Ra-A>Ra-Bの関係を満たすことにより、ハードコート層Aで防眩性を付与しやすくできる一方で、ハードコート層Bの凹凸によって表面保護板を介して観察するもの(物品及び映像等)の解像性が低下することを抑制しやすくできる。
 本明細書において、Ra-A及びRa-Bは、カットオフ値λcを0.8mmとした際のJIS B0601:1994の算術平均粗さを意味するものとする。また、Ra-A及びRa-Bは、任意の20箇所の測定値から最大値及び最小値を切り捨てた18箇所の算術平均粗さの平均を意味するものとする。なお、Ra-Bは、表面保護板を平面視した際に着色層を有さない領域において測定する。
When the arithmetic mean roughness of the surface of the hard coat layer A is defined as Ra-A and the arithmetic mean roughness of the surface of the hard coat layer B is defined as Ra-B, the relationship of Ra-A> Ra-B can be satisfied. preferable.
By satisfying the relationship of Ra-A> Ra-B, it is possible to easily impart antiglare property to the hard coat layer A, while observing through the surface protective plate due to the unevenness of the hard coat layer B (article and image). Etc.) can be easily suppressed from being lowered in resolution.
In the present specification, Ra-A and Ra-B shall mean the arithmetic mean roughness of JIS B0601: 1994 when the cutoff value λc is 0.8 mm. Further, Ra-A and Ra-B shall mean the average of the arithmetic mean roughness of 18 points obtained by rounding down the maximum value and the minimum value from the measured values of any 20 points. Ra-B is measured in a region having no colored layer when the surface protective plate is viewed in a plan view.
 Ra-Aは、0.01~10μmであることが好ましく、0.01~0.149μmであることがより好ましく、0.01~0.114μmであることがさらに好ましい。
 また、Ra-Bは、0.1μm以下であることが好ましく、0.03μm以下であることがより好ましく、0.01μm以下であることがさらに好ましい。
Ra-A is preferably 0.01 to 10 μm, more preferably 0.01 to 0.149 μm, and even more preferably 0.01 to 0.114 μm.
Further, Ra-B is preferably 0.1 μm or less, more preferably 0.03 μm or less, and further preferably 0.01 μm or less.
 ハードコート層Aの表面の凹凸の平均間隔をSm-Aと定義した際に、Ra-A及びSm-Aが下記式(A1)及び(A2)を満たすことが好ましい。
  Ra-A[μm]×Sm-A[μm]≦5.00 (A1)
  0.050[μm]≦Ra-A (A2)
When the average spacing of the irregularities on the surface of the hard coat layer A is defined as Sm-A, it is preferable that Ra-A and Sm-A satisfy the following formulas (A1) and (A2).
Ra-A [μm] x Sm-A [μm] ≤ 5.00 (A1)
0.050 [μm] ≤ Ra-A (A2)
 本明細書において、Sm-Aは、カットオフ値λcを0.8mmとした際のJIS B0601:1994の凹凸の平均間隔を意味するものとする。また、Sm-Aは、任意の20箇所の測定値から最大値及び最小値を切り捨てた18箇所の凹凸の平均間隔の平均を意味するものとする。 In the present specification, Sm-A means the average spacing of the unevenness of JIS B0601: 1994 when the cutoff value λc is 0.8 mm. Further, Sm-A shall mean the average of the average intervals of the unevenness of 18 points obtained by rounding down the maximum value and the minimum value from the measured values of any 20 points.
 ハードコート層Aの表面凹凸は表示素子の画素にとってレンズに相当する。本発明者らは鋭意研究した結果、算術平均粗さRaが大きいと、凹凸の厚み(言い換えると、レンズの厚み)が増してギラツキ(映像光に微細な輝度のばらつきが見える現象)が悪化する傾向があること、及び、凹凸の平均間隔Smが大きいと、凹凸の間隔(言い換えると、レンズの直径)が増してギラツキが悪化する傾向があることを見出した。そして、本発明者らはさらに研究した結果、Ra及びSmを単独で調整してもギラツキを改善しにくいものの、Ra及びSmの積を調整することにより、表面保護板を液晶表示素子等の表示素子の前面に用いる場合にギラツキを改善し得ることを見出した。 The surface unevenness of the hard coat layer A corresponds to a lens for the pixels of the display element. As a result of diligent research by the present inventors, when the arithmetic average roughness Ra is large, the thickness of the unevenness (in other words, the thickness of the lens) increases and the glare (a phenomenon in which minute variations in brightness are visible in the image light) worsens. It has been found that there is a tendency and that when the average spacing Sm of the unevenness is large, the spacing between the irregularities (in other words, the diameter of the lens) tends to increase and the glare tends to worsen. As a result of further research, the present inventors have made it difficult to improve the glare even if Ra and Sm are adjusted independently, but by adjusting the product of Ra and Sm, the surface protective plate can be displayed on a liquid crystal display element or the like. It has been found that glare can be improved when used on the front surface of an element.
 Ra-A×Sm-Aが5.00以下であることは、凹凸により形成されるレンズの厚みが小さいこと、及び/又は、凹凸により形成されるレンズの直径が小さいことを意味する。よって、式(A1)を満たすことにより、ギラツキを抑制しやすくできる。
 Ra-A×Sm-Aは、4.80以下であることが好ましく、4.30以下であることがより好ましく、4.00以下であることがさらに好ましい。
 Ra-A×Sm-Aの下限は特に限定されないが、2.00以上であることが好ましく、2.50以上であることがより好ましく、3.00以上であることがさらに好ましい。なお、Ra-A×Sm-Aの単位は[μm]である。
When Ra-A x Sm-A is 5.00 or less, it means that the thickness of the lens formed by the unevenness is small and / or the diameter of the lens formed by the unevenness is small. Therefore, by satisfying the equation (A1), glare can be easily suppressed.
Ra-A x Sm-A is preferably 4.80 or less, more preferably 4.30 or less, and even more preferably 4.00 or less.
The lower limit of Ra—A × Sm—A is not particularly limited, but is preferably 2.00 or more, more preferably 2.50 or more, and further preferably 3.00 or more. The unit of Ra-A x Sm-A is [μm 2 ].
 Ra-Aが0.050μm以上で式(A2)を満たすことにより、防眩性を良好にすることができる。
 なお、Ra-Aが大き過ぎると、凹凸により形成されるレンズの厚みが増してギラツキが悪化したり、画像鮮明性が低下したりする傾向がある。
 このため、Ra-Aは0.060~0.300μmであることが好ましく、0.070~0.200μmであることがより好ましく、0.080~0.130μmであることがさらに好ましい。
When Ra-A is 0.050 μm or more and the formula (A2) is satisfied, the antiglare property can be improved.
If Ra-A is too large, the thickness of the lens formed by the unevenness tends to increase, the glare tends to deteriorate, and the image sharpness tends to decrease.
Therefore, Ra-A is preferably 0.060 to 0.300 μm, more preferably 0.070 to 0.200 μm, and even more preferably 0.080 to 0.130 μm.
 上記式(A1)を満たす限り、Sm-Aの範囲は特に限定されないが、10~100μmであることが好ましく、20~80μmであることがより好ましく、30~70μmであることがさらに好ましい。 As long as the above formula (A1) is satisfied, the range of Sm-A is not particularly limited, but it is preferably 10 to 100 μm, more preferably 20 to 80 μm, and even more preferably 30 to 70 μm.
 ハードコート層Aの表面の十点平均粗さをRz-Aと定義した際に、Ra-A及びRz-Aが下記式(A3)を満たすことが好ましい。
 Rz-A/Ra-A≦15.0 (A3)
When the ten-point average roughness of the surface of the hard coat layer A is defined as Rz-A, it is preferable that Ra-A and Rz-A satisfy the following formula (A3).
Rz-A / Ra-A ≤ 15.0 (A3)
 Rz-A/Ra-Aは、ハードコート層Aの表面形状のランダム性を示すパラメータといえる。Rz-A/Ra-Aが15.0以下で式(A3)を満たすことにより、ギラツキを抑制しやすくできる。
 Rz-A/Ra-Aは、14.0以下であることが好ましく、13.0以下であることがより好ましく、12.0以下であることがさらに好ましい。
 Rz-A/Ra-Aの下限値は、ハードコート層Aの表面形状に一定のランダム性を付与することができ、ハードコート層Aの欠陥を目立ちにくくすることができるという観点から、5.0以上であることが好ましく、6.0以上であることがより好ましく、7.0以上であることがさらに好ましい。
Rz-A / Ra-A can be said to be a parameter indicating the randomness of the surface shape of the hard coat layer A. By satisfying the formula (A3) when Rz-A / Ra-A is 15.0 or less, glare can be easily suppressed.
Rz—A / Ra—A is preferably 14.0 or less, more preferably 13.0 or less, and even more preferably 12.0 or less.
The lower limit of Rz-A / Ra-A can give a certain randomness to the surface shape of the hard coat layer A, and can make the defects of the hard coat layer A less noticeable. It is preferably 0 or more, more preferably 6.0 or more, and even more preferably 7.0 or more.
 Rz-Aは0.25~5.00μmであることが好ましく、0.50~2.50μmであることがより好ましく、1.00~2.00μmであることがさらに好ましい。
 Rz-Aを0.25μm以上とすることにより、ハードコート層Aの欠陥を目立ちにくくすることができ、歩留まりを向上できる。また、Rz-Aを5.00μm以下とすることにより、表面保護板を液晶表示素子等の表示素子の前面に用いる場合、白化及びギラツキを抑制できる。
Rz—A is preferably 0.25 to 5.00 μm, more preferably 0.50 to 2.50 μm, and even more preferably 1.00 to 2.00 μm.
By setting Rz—A to 0.25 μm or more, defects in the hard coat layer A can be made inconspicuous, and the yield can be improved. Further, by setting Rz—A to 5.00 μm or less, when the surface protective plate is used on the front surface of a display element such as a liquid crystal display element, whitening and glare can be suppressed.
 ハードコート層Aの鉛筆硬度をHa-A、ハードコート層Bの鉛筆硬度をHa-Bと定義した際に、Ha-A>Ha-Bの関係を満たすことが好ましい。
 Ha-A>Ha-Bの関係を満たすことにより、耐擦傷性が重要である表面側のハードコート層Aの耐擦傷性を良好にしやすくできる一方で、裏面側のハードコート層Bに関しては、ハードコート層Bに隣接する層との密着性を良好にしやすくできる。
When the pencil hardness of the hard coat layer A is defined as Ha-A and the pencil hardness of the hard coat layer B is defined as Ha-B, it is preferable to satisfy the relationship of Ha-A> Ha-B.
By satisfying the relationship of Ha-A> Ha-B, the scratch resistance of the hard coat layer A on the front surface side, where scratch resistance is important, can be easily improved, while the hard coat layer B on the back surface side can be easily improved. It is possible to easily improve the adhesion with the layer adjacent to the hard coat layer B.
 ハードコート層Aの鉛筆硬度は、H以上であることが好ましく、2H以上であることがより好ましく、3H以上であることがさらに好ましい。また、ハードコート層Bの鉛筆硬度は、3B~2Hであることが好ましく、2B~Hであることがより好ましい。
 なお、本明細書において、鉛筆硬度は、JIS K5600-5-4:1999に規定する鉛筆硬度試験(4.9N荷重)を行い、傷のつかなかった最も高い硬度に基づくものである。
The pencil hardness of the hard coat layer A is preferably H or higher, more preferably 2H or higher, and even more preferably 3H or higher. Further, the pencil hardness of the hard coat layer B is preferably 3B to 2H, and more preferably 2B to H.
In this specification, the pencil hardness is based on the highest hardness that has not been scratched by performing the pencil hardness test (4.9 N load) specified in JIS K5600-5-4: 1999.
 また、ハードコート層Aは後述する電子線硬化性樹脂組成物から形成されたものとする
一方で、ハードコート層Bは後述する紫外線硬化性樹脂組成物から形成されたものとすることが好ましい。
 ハードコート層Aを電子線硬化性樹脂組成物から形成することにより、ハードコート層Aの耐擦傷性を良好にしやすくできるとともに、ハードコート層Aに紫外線吸収剤を添加しやすくでき、表面保護板の耐候性を良好にしやすくすることができる。
 また、ハードコート層Bを紫外線硬化性樹脂組成物から形成することにより、ハードコート層Bに隣接する層との密着性を良好にしやすくできる。
Further, it is preferable that the hard coat layer A is formed from an electron beam curable resin composition described later, while the hard coat layer B is formed from an ultraviolet curable resin composition described later.
By forming the hard coat layer A from the electron beam curable resin composition, the scratch resistance of the hard coat layer A can be easily improved, and an ultraviolet absorber can be easily added to the hard coat layer A, so that the surface protective plate can be easily formed. It is possible to easily improve the weather resistance of the resin.
Further, by forming the hard coat layer B from the ultraviolet curable resin composition, it is possible to easily improve the adhesion with the layer adjacent to the hard coat layer B.
<<機能層Aの層構成の例>>
 機能層Aの層構成としては、下記A1~A6が挙げられる。なお、下記A1~A6では、「/」は層の界面を意味し、左側に位置する層はコア層側に位置する層を意味する。
(A1)接着層A/ハードコート層A
(A2)接着層A/アンカー層A/ハードコート層A
(A3)接着層A/ハードコート層A/反射防止層A
(A4)接着層A/アンカー層A/ハードコート層A/反射防止層A
(A5)ハードコート層A
(A6)ハードコート層A/反射防止層A
<< Example of layer structure of functional layer A >>
Examples of the layer structure of the functional layer A include the following A1 to A6. In A1 to A6 below, "/" means the interface of the layers, and the layer located on the left side means the layer located on the core layer side.
(A1) Adhesive layer A / Hard coat layer A
(A2) Adhesive layer A / Anchor layer A / Hard coat layer A
(A3) Adhesive layer A / Hard coat layer A / Antireflection layer A
(A4) Adhesive layer A / Anchor layer A / Hard coat layer A / Antireflection layer A
(A5) Hard coat layer A
(A6) Hard coat layer A / Antireflection layer A
<<機能層Bの層構成の例>>
 機能層Bの層構成としては、下記B1~B6が挙げられる。なお、下記B1~B6では、「/」は層の界面を意味し、左側に位置する層はコア層側に位置する層を意味する。
(B1)接着層B/ハードコート層B
(B2)接着層B/アンカー層B/ハードコート層B
(B3)接着層B/ハードコート層B/反射防止層B
(B4)接着層B/アンカー層B/ハードコート層B/反射防止層B
(B5)ハードコート層B
(B6)ハードコート層B/反射防止層B
<< Example of layer structure of functional layer B >>
Examples of the layer structure of the functional layer B include the following B1 to B6. In B1 to B6 below, "/" means the interface of the layers, and the layer located on the left side means the layer located on the core layer side.
(B1) Adhesive layer B / Hard coat layer B
(B2) Adhesive layer B / Anchor layer B / Hard coat layer B
(B3) Adhesive layer B / Hard coat layer B / Antireflection layer B
(B4) Adhesive layer B / Anchor layer B / Hard coat layer B / Antireflection layer B
(B5) Hard coat layer B
(B6) Hard coat layer B / Antireflection layer B
 上記A1、A2及びA5のハードコート層Aは、防眩性を有するハードコート層(算術平均粗さが上記Ra-Aの範囲であるハードコート層)であることが好ましい。
 上記A3、A4及びA6のハードコート層A、並びに、上記B1~B6のハードコート層Bは、表面が比較的平滑なハードコート層(算術平均粗さが上記Ra-Bの範囲であるハードコート層)であることが好ましい。
The hard coat layer A of A1, A2 and A5 is preferably a hard coat layer having antiglare properties (a hard coat layer having an arithmetic mean roughness in the range of RaA).
The hard coat layer A of A3, A4 and A6 and the hard coat layer B of B1 to B6 have a relatively smooth surface (hard coat having an arithmetic mean roughness in the range of Ra-B). Layer) is preferred.
-接着層-
 機能層Aのコア層と接する側の面には、コア層との密着性を向上するために、接着層Aを有していてもよい。同様の観点から、機能層Bのコア層と接する側の面には接着層Bを有していてもよい。
 また、後述のフィルム層のコア層と接する側の面には、コア層との密着性を向上するために、接着層を有していてもよい。
 なお、以下、特に断らない限り、「接着層」と表記した場合、接着層A及び接着層Bの両方を指すものとする。
-Adhesive layer-
An adhesive layer A may be provided on the surface of the functional layer A on the side in contact with the core layer in order to improve the adhesion with the core layer. From the same viewpoint, the adhesive layer B may be provided on the surface of the functional layer B on the side in contact with the core layer.
Further, an adhesive layer may be provided on the surface of the film layer on the side in contact with the core layer, which will be described later, in order to improve the adhesion with the core layer.
In the following, unless otherwise specified, the term "adhesive layer" refers to both the adhesive layer A and the adhesive layer B.
 接着層は、感圧接着層(いわゆる「粘着層」)であってもよいし、感熱接着層(いわゆる「ヒートシール層」)であってもよい。後述するインモールド成形を行う場合には、接着層は感熱接着層であることが好ましい。 The adhesive layer may be a pressure-sensitive adhesive layer (so-called "adhesive layer") or a heat-sensitive adhesive layer (so-called "heat seal layer"). When in-mold molding described later is performed, the adhesive layer is preferably a heat-sensitive adhesive layer.
 また、接着層は、コア層の素材に適した感熱性又は感圧性の樹脂を使用することが好ましい。例えば、コア層の材質がアクリル系樹脂の場合は、アクリル系樹脂を用いることが好ましい。また、コア層の材質がポリフェニレンオキサイド系樹脂、ポリカーボネート系樹脂、スチレン系樹脂の場合は、これらの樹脂と親和性のあるアクリル系樹脂、ポリスチレン系樹脂、ポリアミド系樹脂などを使用することが好ましい。さらに、コア層の材質がポリプロピレン樹脂の場合は、塩素化ポリオレフィン樹脂、塩素化エチレン-酢酸ビニル共重合体樹脂、環化ゴム、クマロンインデン樹脂を使用することが好ましい。 Further, it is preferable to use a heat-sensitive or pressure-sensitive resin suitable for the material of the core layer for the adhesive layer. For example, when the material of the core layer is an acrylic resin, it is preferable to use an acrylic resin. When the material of the core layer is a polyphenylene oxide-based resin, a polycarbonate-based resin, or a styrene-based resin, it is preferable to use an acrylic resin, a polystyrene-based resin, a polyamide-based resin, or the like having an affinity for these resins. Further, when the material of the core layer is polypropylene resin, it is preferable to use chlorinated polyolefin resin, chlorinated ethylene-vinyl acetate copolymer resin, cyclized rubber, and kumaron inden resin.
 接着層の厚みは、0.1~50μmであることが好ましく、0.5~30μmであることがより好ましい。 The thickness of the adhesive layer is preferably 0.1 to 50 μm, more preferably 0.5 to 30 μm.
-ハードコート層-
 ハードコート層A及びハードコート層Bは、熱硬化性樹脂組成物又は電離放射線硬化性樹脂組成物等の硬化性樹脂組成物の硬化物を含むことが好ましく、耐擦傷性をより良くする観点から、電離放射線硬化性樹脂組成物の硬化物を含むことがより好ましい。また、電離放射線硬化性樹脂組成物の代表例としては、紫外線硬化性樹脂組成物及び電子線硬化性樹脂組成物が挙げられる。電子線硬化性樹脂組成物は、開始剤が不要であること、瞬時に硬化して緻密で硬い膜を形成しやすいこと、などの特徴を有する。
 なお、以下、特に断らない限り、「ハードコート層」と表記した場合、ハードコート層A及びハードコート層Bの両方を指すものとする。
-Hard coat layer-
The hard coat layer A and the hard coat layer B preferably contain a cured product of a curable resin composition such as a thermosetting resin composition or an ionizing radiation curable resin composition, and from the viewpoint of improving scratch resistance. , It is more preferable to contain a cured product of the ionizing radiation curable resin composition. Further, typical examples of the ionizing radiation curable resin composition include an ultraviolet curable resin composition and an electron beam curable resin composition. The electron beam curable resin composition has features such as no initiator is required and it is easy to cure instantly to form a dense and hard film.
Hereinafter, unless otherwise specified, the term "hard coat layer" refers to both the hard coat layer A and the hard coat layer B.
 熱硬化性樹脂組成物は、少なくとも熱硬化性樹脂を含む組成物であり、加熱により、硬化する樹脂組成物である。
 熱硬化性樹脂としては、アクリル樹脂、ウレタン樹脂、フェノール樹脂、尿素メラミン樹脂、エポキシ樹脂、不飽和ポリエステル樹脂、シリコーン樹脂等が挙げられる。熱硬化性樹脂組成物には、これら硬化性樹脂に、必要に応じて硬化剤が添加される。
The thermosetting resin composition is a composition containing at least a thermosetting resin, and is a resin composition that is cured by heating.
Examples of the thermosetting resin include acrylic resin, urethane resin, phenol resin, urea melamine resin, epoxy resin, unsaturated polyester resin, and silicone resin. In the thermosetting resin composition, a curing agent is added to these curable resins as needed.
 電離放射線硬化性樹脂組成物は、電離放射線硬化性官能基を有する化合物(以下、「電離放射線硬化性化合物」ともいう)を含む組成物である。電離放射線硬化性官能基としては、(メタ)アクリロイル基、ビニル基、アリル基等のエチレン性不飽和結合基、及びエポキシ基、オキセタニル基等が挙げられる。電離放射線硬化性化合物としては、エチレン性不飽和結合基を有する化合物が好ましく、エチレン性不飽和結合基を2つ以上有する化合物がより好ましく、中でも、エチレン性不飽和結合基を2つ以上有する、多官能性(メタ)アクリレート系化合物が更に好ましい。多官能性(メタ)アクリレート系化合物としては、モノマー及びオリゴマーのいずれも用いることができる。
 なお、電離放射線とは、電磁波又は荷電粒子線のうち、分子を重合あるいは架橋し得るエネルギー量子を有するものを意味し、通常、紫外線(UV)又は電子線(EB)が用いられるが、その他、X線、γ線などの電磁波、α線、イオン線などの荷電粒子線も使用可能である。
 本明細書において、(メタ)アクリレートとは、アクリレート又はメタクリレートを意味し、(メタ)アクリル酸とは、アクリル酸又はメタクリル酸を意味し、(メタ)アクリロイル基とは、アクリロイル基又はメタクリロイル基を意味する。
The ionizing radiation curable resin composition is a composition containing a compound having an ionizing radiation curable functional group (hereinafter, also referred to as “ionizing radiation curable compound”). Examples of the ionizing radiation curable functional group include an ethylenically unsaturated group such as a (meth) acryloyl group, a vinyl group and an allyl group, an epoxy group and an oxetanyl group. As the ionizing radiation curable compound, a compound having an ethylenically unsaturated bond group is preferable, a compound having two or more ethylenically unsaturated bond groups is more preferable, and a compound having two or more ethylenically unsaturated bond groups is particularly preferable. Polyfunctional (meth) acrylate compounds are more preferred. As the polyfunctional (meth) acrylate compound, either a monomer or an oligomer can be used.
Note that ionizing radiation means electromagnetic waves or charged particle beams that have energy quanta capable of polymerizing or cross-linking molecules, and usually ultraviolet rays (UV) or electron beams (EB) are used. Electromagnetic waves such as X-rays and γ-rays, and charged particle beams such as α-rays and ion rays can also be used.
In the present specification, (meth) acrylate means acrylate or methacrylate, (meth) acrylic acid means acrylic acid or methacrylic acid, and (meth) acryloyl group means acryloyl group or methacryloyl group. means.
 多官能性(メタ)アクリレート系化合物のうち、2官能(メタ)アクリレート系モノマーとしては、エチレングリコールジ(メタ)アクリレート、ビスフェノールAテトラエトキシジアクリレート、ビスフェノールAテトラプロポキシジアクリレート、1,6-ヘキサンジオールジアクリレート等が挙げられる。
 3官能以上の(メタ)アクリレート系モノマーとしては、例えば、トリメチロールプロパントリ(メタ)アクリレート、ペンタエリスリトールトリ(メタ)アクリレート、ペンタエリスリトールテトラ(メタ)アクリレート、ジペンタエリスリトールヘキサ(メタ)アクリレート、ジペンタエリスリトールテトラ(メタ)アクリレート、イソシアヌル酸変性トリ(メタ)アクリレート等が挙げられる。
 また、上記(メタ)アクリレート系モノマーは、分子骨格の一部を変性しているものでもよく、エチレンオキサイド、プロピレンオキサイド、カプロラクトン、イソシアヌル酸、アルキル、環状アルキル、芳香族、ビスフェノール等による変性がなされたものも使用することができる。
Among the polyfunctional (meth) acrylate-based compounds, the bifunctional (meth) acrylate-based monomers include ethylene glycol di (meth) acrylate, bisphenol A tetraethoxydiacrylate, bisphenol A tetrapropoxydiacrylate, and 1,6-hexane. Examples thereof include diol diacrylate.
Examples of the trifunctional or higher functional (meth) acrylate-based monomer include trimethylolpropane tri (meth) acrylate, pentaerythritol tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, dipentaerythritol hexa (meth) acrylate, and di. Examples thereof include pentaerythritol tetra (meth) acrylate and isocyanuric acid-modified tri (meth) acrylate.
Further, the (meth) acrylate-based monomer may have a part of the molecular skeleton modified, and is modified with ethylene oxide, propylene oxide, caprolactone, isocyanuric acid, alkyl, cyclic alkyl, aromatic, bisphenol and the like. Can also be used.
 また、多官能性(メタ)アクリレート系オリゴマーとしては、ウレタン(メタ)アクリレート、エポキシ(メタ)アクリレート、ポリエステル(メタ)アクリレート、ポリエーテル(メタ)アクリレート等のアクリレート系重合体等が挙げられる。
 ウレタン(メタ)アクリレートは、例えば、多価アルコール及び有機ジイソシアネートとヒドロキシ(メタ)アクリレートとの反応によって得られる。
 また、好ましいエポキシ(メタ)アクリレートは、3官能以上の芳香族エポキシ樹脂、脂環族エポキシ樹脂、脂肪族エポキシ樹脂等と(メタ)アクリル酸とを反応させて得られる(メタ)アクリレート、2官能以上の芳香族エポキシ樹脂、脂環族エポキシ樹脂、脂肪族エポキシ樹脂等と多塩基酸と(メタ)アクリル酸とを反応させて得られる(メタ)アクリレート、及び2官能以上の芳香族エポキシ樹脂、脂環族エポキシ樹脂、脂肪族エポキシ樹脂等とフェノール類と(メタ)アクリル酸とを反応させて得られる(メタ)アクリレートである。
 上記電離放射線硬化性化合物は1種を単独で、又は2種以上を組み合わせて用いることができる。
Examples of the polyfunctional (meth) acrylate-based oligomer include acrylate-based polymers such as urethane (meth) acrylate, epoxy (meth) acrylate, polyester (meth) acrylate, and polyether (meth) acrylate.
Urethane (meth) acrylate is obtained, for example, by reacting a polyhydric alcohol or organic diisocyanate with a hydroxy (meth) acrylate.
Further, the preferable epoxy (meth) acrylate is a (meth) acrylate obtained by reacting a (meth) acrylic acid with a trifunctional or higher functional aromatic epoxy resin, an alicyclic epoxy resin, an aliphatic epoxy resin or the like, and a bifunctional epoxy resin. (Meta) acrylate obtained by reacting the above aromatic epoxy resin, alicyclic epoxy resin, aliphatic epoxy resin, etc. with polybasic acid and (meth) acrylic acid, and bifunctional or higher functional aromatic epoxy resin, It is a (meth) acrylate obtained by reacting an alicyclic epoxy resin, an aliphatic epoxy resin or the like with phenols and (meth) acrylic acid.
The ionizing radiation curable compound may be used alone or in combination of two or more.
 電離放射線硬化性化合物が紫外線硬化性化合物である場合には、電離放射線硬化性組成物は、光重合開始剤や光重合促進剤等の添加剤を含むことが好ましい。
 光重合開始剤としては、アセトフェノン、ベンゾフェノン、α-ヒドロキシアルキルフェノン、ミヒラーケトン、ベンゾイン、ベンジルジメチルケタール、ベンゾイルベンゾエート、α-アシルオキシムエステル、チオキサントン類等から選ばれる1種以上が挙げられる。
 また、光重合促進剤は、硬化時の空気による重合阻害を軽減させ硬化速度を速めることができるものであり、例えば、p-ジメチルアミノ安息香酸イソアミルエステル、p-ジメチルアミノ安息香酸エチルエステル等から選ばれる1種以上が挙げられる。
When the ionizing radiation curable compound is an ultraviolet curable compound, the ionizing radiation curable composition preferably contains an additive such as a photopolymerization initiator or a photopolymerization accelerator.
Examples of the photopolymerization initiator include one or more selected from acetophenone, benzophenone, α-hydroxyalkylphenone, Michler ketone, benzoin, benzyl dimethyl ketal, benzoyl benzoate, α-acyl oxime ester, thioxanthones and the like.
Further, the photopolymerization accelerator can reduce the polymerization inhibition by air at the time of curing and accelerate the curing rate. For example, from p-dimethylaminobenzoic acid isoamyl ester, p-dimethylaminobenzoic acid ethyl ester and the like. One or more selected species can be mentioned.
 ハードコート層の厚みは、0.1~100μmであることが好ましく、0.5~20μmであることがより好ましく、1~10μmであることがさらに好ましい。ハードコート層の厚みが上記範囲とすることにより、耐擦傷性を良好にしつつ、成形時のクラックの発生を抑制しやすくできる。 The thickness of the hard coat layer is preferably 0.1 to 100 μm, more preferably 0.5 to 20 μm, and even more preferably 1 to 10 μm. By setting the thickness of the hard coat layer within the above range, it is possible to easily suppress the occurrence of cracks during molding while improving the scratch resistance.
-アンカー層-
 機能層Aは耐熱性を向上するためのアンカー層Aを有していてもよい。同様の観点から、機能層Bはアンカー層Bを有していてもよい。
 なお、以下、特に断らない限り、「アンカー層」と表記した場合、アンカー層A及びアンカー層Bの両方を指すものとする。
-Anchor layer-
The functional layer A may have an anchor layer A for improving heat resistance. From the same viewpoint, the functional layer B may have an anchor layer B.
Hereinafter, unless otherwise specified, the term "anchor layer" refers to both the anchor layer A and the anchor layer B.
 コア層上に機能層を形成する際に後述のインモールド成形を採用する場合、コア層を構成する射出樹脂によって機能層が高温に晒される。このため、機能層はアンカー層を有することが好ましい。アンカーコート層の位置はコア層に近い側が好ましい。なお、機能層が上述した接着層を有する場合には、接着層のコア層とは反対側であって接着層と接する箇所にアンカー層を有することが好ましい。 When the in-mold molding described later is adopted when forming the functional layer on the core layer, the functional layer is exposed to a high temperature by the injection resin constituting the core layer. Therefore, the functional layer preferably has an anchor layer. The position of the anchor coat layer is preferably the side closer to the core layer. When the functional layer has the above-mentioned adhesive layer, it is preferable to have an anchor layer at a position opposite to the core layer of the adhesive layer and in contact with the adhesive layer.
 アンカー層は、硬化性樹脂組成物の硬化物を含むことが好ましい。
 硬化性樹脂組成物としては、熱硬化性樹脂組成物、電離放射線硬化性樹脂組成物が挙げられる。
 アンカー層の熱硬化性樹脂組成物、電離放射線硬化性樹脂組成物の実施の形態は、ハードコート層の熱硬化性樹脂組成物、電離放射線硬化性樹脂組成物の実施の形態と同様である。
 アンカー層の厚みは、0.1~6μmであることが好ましく、0.5~5μmであることがより好ましい。
The anchor layer preferably contains a cured product of the curable resin composition.
Examples of the curable resin composition include a thermosetting resin composition and an ionizing radiation curable resin composition.
The embodiment of the thermosetting resin composition and the ionizing radiation curable resin composition of the anchor layer is the same as the embodiment of the thermosetting resin composition and the ionizing radiation curable resin composition of the hard coat layer.
The thickness of the anchor layer is preferably 0.1 to 6 μm, more preferably 0.5 to 5 μm.
-反射防止層-
 機能層Aは、表面の反射を抑制するために、表面側に反射防止層Aを有していてもよい。また、機能層Bは、表面保護板の光透過率を向上するために、背面側に反射防止層Bを有していてもよい。
 なお、以下、特に断らない限り、「反射防止層」と表記した場合、反射防止層A及び反射防止層Bの両方を指すものとする。
-Anti-reflective layer-
The functional layer A may have an antireflection layer A on the surface side in order to suppress reflection on the surface. Further, the functional layer B may have an antireflection layer B on the back surface side in order to improve the light transmittance of the surface protective plate.
Hereinafter, unless otherwise specified, the term "antireflection layer" refers to both the antireflection layer A and the antireflection layer B.
 反射防止層は、例えば、低屈折率層の単層構造、高屈折率層と低屈折率層の2層構造が挙げられる。高屈折率層と低屈折率層の2層構造の場合、高屈折率層をコア層側に配置する。
 高屈折率層及び低屈折率層の屈折率及び厚みは、従来公知の範囲で調整すればよい。なお、高屈折率層及び低屈折率層等の反射防止層は、ウェット法で形成したものと、ドライ法で形成したものとに大別できる。後述するインモールド成形等の射出成形を実施する場合、成形時の割れ防止の観点から、反射防止層はウェット法で形成したものが好ましい。
Examples of the antireflection layer include a single-layer structure having a low refractive index layer and a two-layer structure having a high refractive index layer and a low refractive index layer. In the case of a two-layer structure consisting of a high refractive index layer and a low refractive index layer, the high refractive index layer is arranged on the core layer side.
The refractive index and thickness of the high refractive index layer and the low refractive index layer may be adjusted within a conventionally known range. The antireflection layer such as the high refractive index layer and the low refractive index layer can be roughly classified into those formed by the wet method and those formed by the dry method. When injection molding such as in-mold molding, which will be described later, is carried out, the antireflection layer is preferably formed by a wet method from the viewpoint of preventing cracking during molding.
―低屈折率層―
 低屈折率層の屈折率は、1.10~1.48が好ましく、1.20~1.45がより好ましく、1.26~1.40がより好ましく、1.28~1.38がより好ましく、1.30~1.32がより好ましい。
-Low refractive index layer-
The refractive index of the low refractive index layer is preferably 1.10 to 1.48, more preferably 1.20 to 1.45, more preferably 1.26 to 1.40, and more preferably 1.28 to 1.38. Preferably, 1.30 to 1.32 are more preferable.
 低屈折率層を形成する手法としては、ウェット法とドライ法とに大別できる。ウェット法としては、金属アルコキシド等を用いてゾルゲル法により形成する手法、フッ素樹脂のような低屈折率の樹脂を塗工して形成する手法、樹脂組成物に低屈折率粒子を含有させた低屈折率層形成用塗布液を塗工して形成する手法が挙げられる。ドライ法としては、後述する低屈折率粒子の中から所望の屈折率を有する粒子を選び、物理気相成長法又は化学気相成長法により形成する手法が挙げられる。
 ウェット法は生産効率の点で優れており、ウェット法の中でも、バインダー樹脂組成物に低屈折率粒子を含有させた低屈折率層形成用塗布液により形成することが好ましい。
The method for forming the low refractive index layer can be roughly divided into a wet method and a dry method. As the wet method, a method of forming by a sol-gel method using a metal alkoxide or the like, a method of forming by coating a resin having a low refractive index such as a fluororesin, or a method in which low refractive index particles are contained in a resin composition are low. A method of forming by applying a coating liquid for forming a refractive index layer can be mentioned. Examples of the dry method include a method of selecting particles having a desired refractive index from low refractive index particles described later and forming them by a physical vapor deposition method or a chemical vapor deposition method.
The wet method is excellent in terms of production efficiency, and among the wet methods, it is preferably formed by a coating liquid for forming a low refractive index layer in which low refractive index particles are contained in the binder resin composition.
 低屈折率粒子は、シリカ及びフッ化マグネシウム等の無機化合物からなる粒子、有機化合物からなる粒子のいずれであっても制限なく用いることができるが、低屈折率化により反射防止特性を向上する観点から、空隙を有する構造の粒子が好ましく用いられる。また、低屈折率層の強度を向上する観点から、空隙を有する粒子に加えて、空隙を有さない粒子(中実粒子)を用いることも好ましい。
 空隙を有する構造をもつ粒子は、微細な空隙を内部に有しており、例えば、屈折率1.0の空気などの気体が充填されているので、それ自身の屈折率が低いものとなっている。このような空隙を有する粒子としては、無機系、又は有機系の多孔質粒子、中空粒子などが挙げられ、例えば、多孔質シリカ、中空シリカ粒子、又はアクリル樹脂などが用いられた多孔質ポリマー粒子や中空ポリマー粒子が挙げられる。また、空隙を有さない粒子(中実粒子)の材質は、シリカ及びフッ化マグネシウム等の無機化合物が好ましい。
 低屈折率粒子の一次粒子の平均粒子径は、空隙を有する粒子では50~100nmが好ましく、60~80nmがより好ましく、空隙を有さない粒子(中実粒子)では5~20nmが好ましく、10~15nmがより好ましい。
The low refractive index particles can be used without limitation whether they are particles made of an inorganic compound such as silica or magnesium fluoride or particles made of an organic compound, but from the viewpoint of improving the antireflection property by lowering the refractive index. Therefore, particles having a structure having voids are preferably used. Further, from the viewpoint of improving the strength of the low refractive index layer, it is also preferable to use particles having no voids (solid particles) in addition to the particles having voids.
Particles having a structure having voids have fine voids inside, and are filled with a gas such as air having a refractive index of 1.0, so that the particles themselves have a low refractive index. There is. Examples of the particles having such voids include inorganic or organic porous particles and hollow particles. For example, porous polymer particles using porous silica, hollow silica particles, acrylic resin and the like. And hollow polymer particles. Further, the material of the particles having no voids (solid particles) is preferably an inorganic compound such as silica and magnesium fluoride.
The average particle size of the primary particles of the low refractive index particles is preferably 50 to 100 nm for particles having voids, more preferably 60 to 80 nm, and preferably 5 to 20 nm for particles having no voids (solid particles). ~ 15 nm is more preferable.
 低屈折率粒子の含有量は、バインダー成分100質量部に対して、空隙を有する粒子では50~400質量部が好ましく、60~300質量部がより好ましく、70~200質量部がより好ましく、空隙を有さない粒子(中実粒子)では70~250質量部が好ましく、90~200質量部がより好ましく、100~150質量部がより好ましい。 The content of the low refractive index particles is preferably 50 to 400 parts by mass, more preferably 60 to 300 parts by mass, more preferably 70 to 200 parts by mass, and voids in the particles having voids with respect to 100 parts by mass of the binder component. 70 to 250 parts by mass is preferable, 90 to 200 parts by mass is more preferable, and 100 to 150 parts by mass is more preferable.
 バインダー樹脂組成物は、硬化性樹脂組成物が好ましい。硬化性樹脂組成物は、反射防止層中で硬化物となり、バインダー成分となる。
 硬化性樹脂組成物は、熱硬化性樹脂組成物、電離放射線硬化性樹脂組成物が挙げられ、これらの中でも電離放射線硬化性樹脂組成物が好ましい。
 なお、低反射率層のバインダー樹脂組成物の熱硬化性樹脂組成物、電離放射線硬化性樹脂組成物の実施の形態は、ハードコート層の熱硬化性樹脂組成物、電離放射線硬化性樹脂組成物の実施の形態と同様である。
The binder resin composition is preferably a curable resin composition. The curable resin composition becomes a cured product in the antireflection layer and becomes a binder component.
Examples of the curable resin composition include a thermosetting resin composition and an ionizing radiation curable resin composition, and among these, an ionizing radiation curable resin composition is preferable.
The embodiment of the thermosetting resin composition and the ionizing radiation curable resin composition of the binder resin composition of the low reflectance layer is the thermosetting resin composition of the hard coat layer and the ionizing radiation curable resin composition. It is the same as the embodiment of.
―高屈折率層―
 反射防止層は、さらに高屈折率層を有していてもよい。低屈折率層に加えて高屈折率層を有することにより、反射率の低い波長領域を広げることができる。
 高屈折率層は低屈折率層よりもコア層側に配置する。
-High refractive index layer-
The antireflection layer may further have a high refractive index layer. By having a high refractive index layer in addition to the low refractive index layer, a wavelength region having low reflectance can be widened.
The high refractive index layer is arranged closer to the core layer than the low refractive index layer.
 高屈折率層は、屈折率が1.53~1.85が好ましく、1.54~1.80がより好ましく、1.55~1.75がより好ましく、1.56~1.70がより好ましい。
 また、高屈折率層の厚みは、200nm以下が好ましく、50~180nmがより好ましく、70~150nmがさらに好ましい。
The high refractive index layer preferably has a refractive index of 1.53 to 1.85, more preferably 1.54 to 1.80, more preferably 1.55 to 1.75, and more preferably 1.56 to 1.70. preferable.
The thickness of the high refractive index layer is preferably 200 nm or less, more preferably 50 to 180 nm, and even more preferably 70 to 150 nm.
 高屈折率層は、例えば、バインダー樹脂組成物及び高屈折率粒子を含む高屈折率層塗布液から形成することができる。該バインダー樹脂組成物としては、例えば、ハードコート層で例示した硬化性樹脂組成物を用いることができる。 The high refractive index layer can be formed from, for example, a binder resin composition and a high refractive index layer coating liquid containing high refractive index particles. As the binder resin composition, for example, the curable resin composition exemplified in the hard coat layer can be used.
 高屈折率粒子としては、五酸化アンチモン(1.79)、酸化亜鉛(1.90)、酸化チタン(2.3~2.7)、酸化セリウム(1.95)、スズドープ酸化インジウム(1.95~2.00)、アンチモンドープ酸化スズ(1.75~1.85)、酸化イットリウム(1.87)及び酸化ジルコニウム(2.10)等が挙げられる。
 高屈折率粒子の一次粒子の平均粒子径は、5~200nmが好ましく、5~100nmがより好ましく、10~80nmがさらに好ましい。
Examples of high refractive index particles include antimony pentoxide (1.79), zinc oxide (1.90), titanium oxide (2.3 to 2.7), cerium oxide (1.95), and tin-doped indium oxide (1. 95-2.00), antimony-doped tin oxide (1.75-1.85), yttrium oxide (1.87), zirconium oxide (2.10) and the like.
The average particle size of the primary particles of the high refractive index particles is preferably 5 to 200 nm, more preferably 5 to 100 nm, still more preferably 10 to 80 nm.
―フィルム層―
 本発明の表面保護板は、コア層と機能層Aとの間にフィルム層Aを有することが好ましい。また、コア層と機能層Bとの間にフィルム層Bを有してもよいが、薄膜化の観点からは、コア層と機能層Bとの間にフィルム層Bを有さないことが好ましい。
 コア層と機能層との間にフィルム層を有することによって(特に、コア層と機能層Aとの間にフィルム層Aを有することによって)、表面保護板の表面の鉛筆硬度を高くしやすくでき、表面保護板の耐擦傷性を向上しやすくできる。
-Film layer-
The surface protective plate of the present invention preferably has a film layer A between the core layer and the functional layer A. Further, the film layer B may be provided between the core layer and the functional layer B, but from the viewpoint of thinning, it is preferable not to have the film layer B between the core layer and the functional layer B. ..
By having a film layer between the core layer and the functional layer (particularly, by having the film layer A between the core layer and the functional layer A), it is possible to easily increase the pencil hardness of the surface of the surface protective plate. , The scratch resistance of the surface protection plate can be easily improved.
 フィルム層としては、ポリエチレン、ポリプロピレンなどのポリオレフィン系樹脂、ポリ塩化ビニル、ポリ塩化ビニリデン、ポリビニルアルコール、エチレン・酢酸ビニル共重合体、エチレン・ビニルアルコール共重合体などのビニル系樹脂、ポリエチレンテレフタレート、ポリエチレンナフタレート、ポリブチレンテレフタレートなどのポリエステル系樹脂、ポリ(メタ)アクリル酸メチル、ポリ(メタ)アクリル酸エチルなどのアクリル系樹脂、ポリスチレン等のスチレン系樹脂、ナイロン6又はナイロン66などで代表されるポリアミド系樹脂などの樹脂からなるプラスチックフィルムが挙げられる。
 これらのプラスチックフィルムの中では、耐熱性及び寸法安定性の観点からは2軸延伸ポリエステルフィルムが好ましく、インサート成形等の成形性及び耐候性の観点からはアクリルフィルム、ポリカーボネートフィルム、またはアクリルとポリカーボネートとの共押し出し品が好ましい。
The film layer includes polyolefin resins such as polyethylene and polypropylene, polyvinyl chloride, polyvinylidene chloride, polyvinyl alcohol, ethylene / vinyl acetate copolymers, vinyl resins such as ethylene / vinyl alcohol copolymers, polyethylene terephthalates, and polyethylene. Represented by polyester resins such as naphthalate and polybutylene terephthalate, acrylic resins such as methyl poly (meth) acrylate and ethyl poly (meth) acrylate, styrene resins such as polystyrene, nylon 6 or nylon 66, etc. Examples thereof include a plastic film made of a resin such as a polyamide resin.
Among these plastic films, biaxially stretched polyester film is preferable from the viewpoint of heat resistance and dimensional stability, and acrylic film, polycarbonate film, or acrylic and polycarbonate are used from the viewpoint of moldability such as insert molding and weather resistance. The co-extruded product is preferable.
 フィルム層の厚みは、成形性及び取り扱い性等の観点から、40μm~500μmであることが好ましく、100μm~300μmであることがより好ましく、150μm~280μmであることがよりさらに好ましい。 The thickness of the film layer is preferably 40 μm to 500 μm, more preferably 100 μm to 300 μm, and even more preferably 150 μm to 280 μm from the viewpoint of moldability and handleability.
―プライマー層―
 本発明の表面保護板のフィルム層Aは、フィルム層Aの機能層Aと接する側の面に、プライマー層Aを有することが好ましい。また、表面保護板がフィルム層Bを含む場合、フィルム層Bの機能層Bと接する側の面に、プライマー層Bを有することが好ましい。
 フィルム層の機能層と接する側の面にプライマー層を有することで、フィルム層と機能層との密着性をより良好にしやすくでき、より強固な表面保護板を作製することができる。
-Primer layer-
The film layer A of the surface protection plate of the present invention preferably has a primer layer A on the surface of the film layer A on the side in contact with the functional layer A. When the surface protective plate includes the film layer B, it is preferable to have the primer layer B on the surface of the film layer B on the side in contact with the functional layer B.
By having the primer layer on the surface of the film layer in contact with the functional layer, the adhesion between the film layer and the functional layer can be easily improved, and a stronger surface protective plate can be produced.
 プライマー層は、熱可塑性樹脂、あるいは、熱硬化性樹脂組成物又は電離放射線硬化性樹脂組成物等の硬化性樹脂組成物の硬化物を含むことが好ましい。
 なお、プライマー層の熱可塑性樹脂の実施形態は、コア層の熱可塑性樹脂として例示したものと同様のものが挙げられる。また、プライマー層の熱硬化性樹脂組成物、電離放射線硬化性樹脂組成物の実施の形態は、ハードコート層の熱硬化性樹脂組成物、電離放射線硬化性樹脂組成物の実施の形態と同様である。
The primer layer preferably contains a thermoplastic resin or a cured product of a curable resin composition such as a thermosetting resin composition or an ionizing radiation curable resin composition.
Examples of the thermoplastic resin for the primer layer include the same as those exemplified as the thermoplastic resin for the core layer. Further, the embodiment of the thermosetting resin composition and the ionizing radiation curable resin composition of the primer layer is the same as the embodiment of the thermosetting resin composition and the ionizing radiation curable resin composition of the hard coat layer. is there.
 プライマー層の厚みは、0.1~10μmであることが好ましく、0.2~5μmであることがより好ましく、0.3~3μmであることがさらに好ましい。 The thickness of the primer layer is preferably 0.1 to 10 μm, more preferably 0.2 to 5 μm, and even more preferably 0.3 to 3 μm.
[表面保護板の製造方法]
 本発明の表面保護板の製造方法は、下記の工程(1)~(2)を有するものである。
[Manufacturing method of surface protection plate]
The method for producing a surface protective plate of the present invention has the following steps (1) and (2).
(1)一対の射出成形用金型の一方の側に、機能層Aを有してなる積層体Aを配置するとともに、前記金型の他方の側に、機能層Bを有し、前記機能層B上の一部に着色層を有してなる積層体Bを配置する工程。
(2)前記金型を締め、前記金型内に射出樹脂を注入し、前記積層体Aと、前記射出樹脂を含むコア層と、前記積層体Bとを密着させた積層体Xを得る工程。
(1) The laminated body A having the functional layer A is arranged on one side of the pair of injection molding dies, and the functional layer B is provided on the other side of the mold. A step of arranging a laminated body B having a colored layer on a part of the layer B.
(2) A step of tightening the mold and injecting an injection resin into the mold to obtain a laminate X in which the laminate A, a core layer containing the injection resin, and the laminate B are in close contact with each other. ..
 工程(1)で上下に配置する積層体A及び積層体Bの組み合わせとしては、以下の(Z1)~(Z4)のパターンが挙げられる。
(Z1)積層体A:離型シート上に機能層Aを有してなる転写シートA、積層体B:離型シート上に機能層Bを有してなる転写シートB
(Z2)積層体A:フィルム層Aと機能層Aとを積層した積層フィルムA、積層体B:離型シート上に機能層Bを有してなる転写シートB
(Z3)積層体A:離型シート上に機能層Aを有してなる転写シートA、積層体B:フィルム層Bと機能層Bとを積層した積層フィルムB
(Z4)積層体A:フィルム層Aと機能層Aとを積層した積層フィルムA、積層体B: フィルム層Bと機能層Bとを積層した積層フィルムB
Examples of the combination of the laminated body A and the laminated body B arranged vertically in the step (1) include the following patterns (Z1) to (Z4).
(Z1) Laminated body A: Transfer sheet A having a functional layer A on a release sheet, Laminated body B: Transfer sheet B having a functional layer B on a release sheet
(Z2) Laminated body A: Laminated film A in which the film layer A and the functional layer A are laminated, Laminated body B: Transfer sheet B having the functional layer B on the release sheet
(Z3) Laminated body A: Transfer sheet A having a functional layer A on a release sheet, Laminated body B: Laminated film B in which a film layer B and a functional layer B are laminated.
(Z4) Laminated body A: Laminated film A in which the film layer A and the functional layer A are laminated, Laminated body B: Laminated film B in which the film layer B and the functional layer B are laminated.
 工程(1)では、積層体A又は積層体Bに転写シートを用いる場合、転写シートの離型シートとは反対側の面が、射出成形用金型を構成する一対の型(雄型及び雌型)により形成される空隙側(射出樹脂と接する側)を向くようにして、転写シートを金型に当接させる。 In the step (1), when a transfer sheet is used for the laminated body A or the laminated body B, the surface of the transfer sheet opposite to the release sheet forms a pair of molds (male mold and female) forming a mold for injection molding. The transfer sheet is brought into contact with the mold so as to face the void side (the side in contact with the injection resin) formed by the mold).
 積層体A又は積層体Bが転写シートの場合の射出成形は、いわゆる「インモールド成形」である。積層体A及び積層体Bの両方が転写シートの場合の射出成形は、いわゆる「ダブルインモールド成形」である。
 積層体A又は積層体Bが積層フィルムの場合の射出成形は、いわゆる「インサート成形」である。積層体A及び積層体Bの両方が積層フィルムの場合の射出成形は、いわゆる「ダブルインサート成形」である。
 積層体A及び積層体Bの一方が転写シートで、他方が積層フィルムの場合の射出成形は、いわゆる「ダブルインサートインモールド成形」である。
Injection molding when the laminate A or the laminate B is a transfer sheet is so-called "in-mold molding". Injection molding when both the laminate A and the laminate B are transfer sheets is so-called "double in-mold molding".
Injection molding when the laminated body A or the laminated body B is a laminated film is so-called "insert molding". Injection molding when both the laminated body A and the laminated body B are laminated films is so-called "double insert molding".
Injection molding when one of the laminated body A and the laminated body B is a transfer sheet and the other is a laminated film is so-called "double insert-in mold molding".
 工程(1)で用いる転写シートAは、離型シート上に、機能層Aを構成する各層を順次形成することにより得ることができる。
 また、工程(1)で用いる転写シートBは、離型シート上に、機能層Bを構成する各層を順次形成した後、機能層Bの一部に着色層を形成することにより得ることができる。着色層はエッジをシャープにする観点から、固形の着色層(例えばインクリボン)を溶融熱転写して形成することが好ましい。
The transfer sheet A used in the step (1) can be obtained by sequentially forming each layer constituting the functional layer A on the release sheet.
Further, the transfer sheet B used in the step (1) can be obtained by sequentially forming each layer constituting the functional layer B on the release sheet and then forming a colored layer on a part of the functional layer B. .. From the viewpoint of sharpening the edges, the colored layer is preferably formed by melt heat transfer of a solid colored layer (for example, an ink ribbon).
 転写シートの機能層がハードコート層を有する場合、ハードコート層の表面形状は、離型シートの表面形状を反転したものに類する形状となる。すなわち、ハードコート層A及びハードコート層Bの表面形状は、離型シートの表面形状により調整できる。 When the functional layer of the transfer sheet has a hard coat layer, the surface shape of the hard coat layer is similar to the inverted surface shape of the release sheet. That is, the surface shapes of the hard coat layer A and the hard coat layer B can be adjusted by the surface shape of the release sheet.
 また、工程(1)では、積層体A又はBに積層フィルムを用いる場合、積層フィルムの機能層とは反対側の面が、成形用金型を構成する一対の型(雄型及び雌型)により形成される空隙側(射出樹脂と接する側)を向くようにして、積層フィルムを金型に当接させる。 Further, in the step (1), when a laminated film is used for the laminated body A or B, the surface of the laminated film opposite to the functional layer is a pair of molds (male mold and female mold) forming a molding die. The laminated film is brought into contact with the mold so as to face the void side (the side in contact with the injection resin) formed by.
 工程(1)で用いる積層フィルムAは、フィルム層A上に、機能層Aを構成する各層を順次形成することにより得ることができる。また、フィルム層Aと機能層Aとの間にプライマー層を設ける場合、フィルム層A上に機能層Aを形成する前に、フィルム層Aの機能層Aと接する側の面上にプライマー層を形成してもよい。 The laminated film A used in the step (1) can be obtained by sequentially forming each layer constituting the functional layer A on the film layer A. When a primer layer is provided between the film layer A and the functional layer A, the primer layer is placed on the surface of the film layer A on the side in contact with the functional layer A before the functional layer A is formed on the film layer A. It may be formed.
 なお、積層体A及び積層体Bの機能層がハードコート層を有する場合、転写シートの段階では該ハードコート層を半硬化の状態としておき、積層体X成形後に紫外線を照射するなどしてハードコート層の硬化を進行することが好ましい。かかる手法とすることにより、成形性を良好にしやすくできる。 When the functional layers of the laminate A and the laminate B have a hard coat layer, the hard coat layer is kept in a semi-cured state at the stage of the transfer sheet, and the laminate X is molded and then irradiated with ultraviolet rays to make it hard. It is preferable to proceed with the curing of the coat layer. By adopting such a method, the moldability can be easily improved.
 工程(2)の射出樹脂は熱可塑性樹脂を用いることが好ましい。このような熱可塑性樹脂としては、ポリスチレン系樹脂、ポリオレフィン系樹脂、ABS樹脂(耐熱ABS樹脂を含む)、AS樹脂、AN樹脂、ポリフェニレンオキサイド系樹脂、ポリカーボネート系樹脂、ポリアセタール系樹脂、アクリル系樹脂、ポリエチレンテレフタレート系樹脂、ポリブチレンテフタレート系樹脂、ポリスルフォン系樹脂、およびポリフェニレンサルファイド系樹脂から選ばれる1種または混合物等が挙げられる。 It is preferable to use a thermoplastic resin as the injection resin in the step (2). Examples of such thermoplastic resins include polystyrene-based resins, polyolefin-based resins, ABS resins (including heat-resistant ABS resins), AS resins, AN resins, polyphenylene oxide-based resins, polycarbonate-based resins, polyacetal-based resins, and acrylic-based resins. Examples thereof include one or a mixture selected from a polyethylene terephthalate resin, a polybutylene tephthalate resin, a polysulphon resin, and a polyphenylene sulfide resin.
 工程(2)において、射出成形の型内に樹脂を射出する際は、射出樹脂と直接接する層(機能層のうちのコア層側に位置する層、及び着色層、又はフィルム層)の材質を考慮して、密着性が良好となるように、射出樹脂の温度、圧力、速度を調整することが好ましい。 In step (2), when the resin is injected into the injection molding mold, the material of the layer (the layer located on the core layer side of the functional layers, the colored layer, or the film layer) that is in direct contact with the injection resin is selected. In consideration, it is preferable to adjust the temperature, pressure, and speed of the injection resin so that the adhesion is good.
 積層体A及び積層体Bが離型シートを有する場合、本発明の表面保護板の製造方法は、更に下記工程(3)を有することが好ましい。
(3)前記金型を開くとともに、前記積層体Xから転写シートの離型シートを剥離する工程。
 なお、工程(3)において、離型シートを剥離する際の機能層の箔切れや転写不良を抑制するために、コア層の素材と機能層の素材との組み合わせを選定したり、機能層の厚みを調整したりすることが好ましい。
When the laminate A and the laminate B have a release sheet, the method for producing the surface protective plate of the present invention preferably further includes the following step (3).
(3) A step of opening the mold and peeling the release sheet of the transfer sheet from the laminated body X.
In step (3), in order to suppress foil breakage and transfer defects of the functional layer when the release sheet is peeled off, a combination of the core layer material and the functional layer material may be selected, or the functional layer may be selected. It is preferable to adjust the thickness.
[積層部材]
 本発明の積層部材は、表面保護板の背面側に、粘着層を介して、少なくとも1枚のプラスチックフィルムを有する機能性部材が積層されてなるものである。
[Laminated member]
The laminated member of the present invention is formed by laminating a functional member having at least one plastic film on the back surface side of the surface protective plate via an adhesive layer.
 本発明の積層部材を構成する表面保護板は、背面側の最表面において、着色層を有する領域と、着色層を有さない領域との境界の傾斜が抑制されている。このため、該表面保護板の背面側に機能性部材を貼り合わせてなる本発明の積層部材は、機能性部材のプラスチックフィルムの光軸を変化させにくくすることができ、視認性の低下を抑制することができる。 In the surface protective plate constituting the laminated member of the present invention, the inclination of the boundary between the region having the colored layer and the region not having the colored layer is suppressed on the outermost surface on the back surface side. Therefore, the laminated member of the present invention in which the functional member is bonded to the back surface side of the surface protective plate can make it difficult to change the optical axis of the plastic film of the functional member, and suppresses a decrease in visibility. can do.
<粘着層>
 粘着層は、汎用の粘着剤から形成することができるが、いわゆる透明光学粘着層(OCA)であることが好ましい。
 透明光学粘着層は、光学特性、耐光性、耐候性、耐熱性及び透明性の観点からアクリル系樹脂が好適に用いられる。アクリル系樹脂を構成するモノマーとしては、アクリル酸エチル、アクリル酸ブチル、アクリル酸アミル、アクリル酸2-エチルヘキシル、アクリル酸オクチル、アクリル酸シクロヘキシル、アクリル酸ベンジル等のアクリル酸アルキルエステルや、メタクリル酸エチル、メタクリル酸ブチル、メタクリル酸2-エチルヘキシル、メタクリル酸シクロヘキシル、メタクリル酸ベンジル等のメタクリル酸アルキルエステル等が挙げられる。また、アクリル系樹脂を構成するモノマーは、前述したモノマーに加え、酢酸ビニル、プロピオン酸ビニル、ビニルエーテル、スチレン、アクリロニトリル、メタクリロニトリル等のビニル基含有化合物を共重合モノマーとして用いても良い。
<Adhesive layer>
The pressure-sensitive adhesive layer can be formed from a general-purpose pressure-sensitive adhesive, but is preferably a so-called transparent optical pressure-sensitive adhesive layer (OCA).
As the transparent optical adhesive layer, an acrylic resin is preferably used from the viewpoint of optical properties, light resistance, weather resistance, heat resistance and transparency. Examples of the monomer constituting the acrylic resin include acrylic acid alkyl esters such as ethyl acrylate, butyl acrylate, amyl acrylate, 2-ethylhexyl acrylate, octyl acrylate, cyclohexyl acrylate, and benzyl acrylate, and ethyl methacrylate. , Methacrylic acid alkyl esters such as butyl methacrylate, 2-ethylhexyl methacrylate, cyclohexyl methacrylate and benzyl methacrylate can be mentioned. Further, as the monomer constituting the acrylic resin, in addition to the above-mentioned monomer, a vinyl group-containing compound such as vinyl acetate, vinyl propionate, vinyl ether, styrene, acrylonitrile, and methacrylonitrile may be used as the copolymerization monomer.
 粘着層の厚みは、0.1~50μmであることが好ましく、0.5~30μmであることがより好ましい。 The thickness of the adhesive layer is preferably 0.1 to 50 μm, more preferably 0.5 to 30 μm.
 本発明の積層部材の一実施形態は、機能性部材の最も表面保護板側に位置するプラスチックフィルムと、粘着層との間にガラスを有さないことが好ましい。積層部材が当該構成を有することにより、本発明の効果を発揮しやすくできる。 In one embodiment of the laminated member of the present invention, it is preferable that there is no glass between the plastic film located closest to the surface protective plate side of the functional member and the adhesive layer. When the laminated member has such a structure, the effect of the present invention can be easily exerted.
<機能性部材>
 少なくとも1枚のプラスチックフィルムを有する機能性部材は、プラスチックフィルムの単層であってもよいし、プラスチックフィルム以外の部材を有する機能性部材(例えばタッチパネル)であってもよい。
 プラスチックフィルムを含むタッチパネルとしては、静電容量式タッチパネル、抵抗膜式タッチパネル、光学式タッチパネル、超音波式タッチパネル及び電磁誘導式タッチパネル等が挙げられる。
<Functional member>
The functional member having at least one plastic film may be a single layer of the plastic film, or may be a functional member having a member other than the plastic film (for example, a touch panel).
Examples of the touch panel including the plastic film include a capacitance type touch panel, a resistive touch panel, an optical touch panel, an ultrasonic touch panel, an electromagnetic induction type touch panel and the like.
<<プラスチックフィルム>>
 機能性部材に含まれるプラスチックフィルムとしては、ポリエステル、トリアセチルセルロース(TAC)、セルロースジアセテート、セルロースアセテートブチレート、ポリアミド、ポリイミド、ポリエーテルスルフォン、ポリスルフォン、ポリプロピレン、ポリメチルペンテン、ポリ塩化ビニル、ポリビニルアセタール、ポリエーテルケトン、ポリメタクリル酸メチル、ポリカーボネート、ポリウレタン及び非晶質オレフィン(Cyclo-Olefin-Polymer:COP)等の樹脂から形成されてなるものが挙げられる。
 これらプラスチックフィルムの中でも、延伸処理されたプラスチックフィルムは、光軸の変化による視認性に影響を生じやすい。したがって、プラスチックフィルムとして延伸処理されたプラスチックフィルムを含む場合、本発明の構成に基づく効果がより顕著に発揮される点で好ましい。特に、延伸ポリエステルフィルム(延伸ポリエステルフィルムの中でも、特に一軸延伸ポリエステルフィルム)は面内リタデーションの値が高く、部分的に光軸が変化することによって当該部分の面内リタデーションが変化しやすいため、本発明の構成に基づく効果がより顕著に発揮されやすい。
<< Plastic film >>
Examples of the plastic film contained in the functional member include polyester, triacetyl cellulose (TAC), cellulose diacetate, cellulose acetate butyrate, polyamide, polyimide, polyether sulphon, polysulphon, polypropylene, polymethylpentene, and polyvinyl chloride. Examples thereof include those formed of resins such as polyvinyl acetal, polyether ketone, polymethyl methacrylate, polycarbonate, polyurethane and amorphous olefin (Cyclo-Olfin-Polyester: COP).
Among these plastic films, the stretched plastic film tends to affect the visibility due to the change of the optical axis. Therefore, when the stretched plastic film is included as the plastic film, the effect based on the constitution of the present invention is more remarkably exhibited, which is preferable. In particular, the stretched polyester film (among the stretched polyester films, especially the uniaxially stretched polyester film) has a high in-plane retardation value, and the in-plane retardation of the portion is likely to change due to a partial change in the optical axis. The effect based on the constitution of the invention is more likely to be exhibited.
 プラスチックフィルムの波長589nmにおける面内リタデーションは、3000nm~30000nmが好ましく、5000nm~20000nmより好ましく、7000nm~15000nmさらに好ましい。
 プラスチックフィルムの面内リタデーション(Re)は、プラスチックフィルムの面内において最も屈折率が大きい方向(遅相軸方向)の屈折率(nx)と、遅相軸方向と直交する方向(進相軸方向)の屈折率(ny)と、プラスチックフィルムの厚み(d)(nm)とにより、前記式(1)によって表されるものである。 
 面内リタデーションは、例えば、王子計測機器株式会社製KOBRA-WRによって測定することができる。
The in-plane retardation of the plastic film at a wavelength of 589 nm is preferably 3000 nm to 30,000 nm, more preferably 5000 nm to 20000 nm, and even more preferably 7000 nm to 15000 nm.
The in-plane retardation (Re) of the plastic film is the refractive index (nx) in the direction having the largest refractive index in the plane of the plastic film (slow phase axis direction) and the direction orthogonal to the slow phase axis direction (phase advance axis direction). ) With the refractive index (ny) and the thickness (d) (nm) of the plastic film, which is represented by the above formula (1).
The in-plane retardation can be measured by, for example, KOBRA-WR manufactured by Oji Measuring Instruments Co., Ltd.
 プラスチックフィルムの厚みは、5~200μmであることが好ましく、10~150μmであることがより好ましい。 The thickness of the plastic film is preferably 5 to 200 μm, more preferably 10 to 150 μm.
[画像表示装置]
 本発明の画像表示装置は、表示素子上に、上述した本発明の積層部材を有してなり、前記積層部材の前記機能性部材側の面が前記表示素子側を向くように配置してなるものである。
[Image display device]
The image display device of the present invention comprises the above-mentioned laminated member of the present invention on a display element, and is arranged so that the surface of the laminated member on the functional member side faces the display element side. It is a thing.
 表示素子としては、液晶表示素子、EL表示素子、プラズマ表示素子、電子ペーパー素子等が挙げられる。 Examples of the display element include a liquid crystal display element, an EL display element, a plasma display element, an electronic paper element, and the like.
 以下、実施例及び比較例を挙げて本発明を具体的に説明する。なお、本発明は、実施例に記載の形態に限定されるものではない。 Hereinafter, the present invention will be specifically described with reference to Examples and Comparative Examples. The present invention is not limited to the embodiments described in the examples.
1.測定、評価
 実施例及び比較例で得られた表面保護板について以下の測定及び評価を行った。結果を表1に示す。
1. 1. Measurement and evaluation The following measurements and evaluations were performed on the surface protection plates obtained in Examples and Comparative Examples. The results are shown in Table 1.
1-1.境界領域の表面形状
[表面形状の測定及び解析]
 実施例及び比較例の表面保護板の背面側の最表面における、着色層を有する領域と着色層を有さない領域との境界の表面形状を測定した。測定には、白色干渉顕微鏡(New View6300、Zygo社)を用い、以下の条件にて測定及び解析した。
 測定にはMetroPro ver8.1.5のMicroscope Applicationを用いた。解析にはMetroPro ver8.1.5のMicroscope ApplicationおよびAdvanced Texture Applicationを用いた。
<測定条件>
対物レンズ:×50
Image Zoom:×1
[Measurement Controls]
Acquisition Mode:Scan
Camera Mode:992×992 50Hz
Subtract Sys Err:Off
AGC:On
Phase Res:High
Connetion Order:Location
Discon Action:Filter
Min Mod(%):0.001
Min Area Size:7
Image Zoom:×1
Remove Fringes:On
Number of Averages:0
FDA Noise Threshold:10
Scan Length:15um bipolar
Extended Scan Length:1000 μm
FDA Res:High
カメラ解像度(1点当たりの間隔):0.22μm
測定領域:216μm×216μm
[Surface Map Controls]
Removed:None
sphere Radius:0nm
Trim:0
Trim Mode:All
Data Fill:On
Data Fill Max:500
Filter:Off
FilterType:Gauss Spline
Filter Window Size: 3
Filter Trim: On
Filter Low Wavelen:1100μm
Filter High Wavelen:200μm
Filter Low Freq:0.90909 1/mm
Filter High Freq:5.00000 1/mm
1-1. Surface shape of boundary region [Measurement and analysis of surface shape]
The surface shape of the boundary between the region having the colored layer and the region not having the colored layer on the outermost surface on the back surface side of the surface protective plates of Examples and Comparative Examples was measured. A white interference microscope (New View 6300, Zygo) was used for the measurement, and the measurement and analysis were performed under the following conditions.
A Microscope Application of MetroPro ver 8.1.5 was used for the measurement. For the analysis, Microscope Application and Advanced Texture Application of MetroPro ver 8.1.5 were used.
<Measurement conditions>
Objective lens: × 50
Image Zoom: x1
[Measurement Controls]
Acquisition Mode: Scan
Camera Mode: 992 x 992 50Hz
Subtract Systems Err: Off
AGC: On
Phase Res: High
Connection Orderer: Location
Discon Action: Filter
Min Mod (%): 0.001
Min Area Size: 7
Image Zoom: x1
Remove Fringes: On
Number of Averages: 0
FDA Noise Throld: 10
Scan Length: 15um bipolar
Extended Scan Length: 1000 μm
FDA Res: High
Camera resolution (interval per point): 0.22 μm
Measurement area: 216 μm × 216 μm
[Surface Map Controls]
Removed: None
sphere Radius: 0nm
Trim: 0
Trim Mode: All
Data Fill: On
Data Fill Max: 500
Filter: Off
FilterType: Gauss Spline
Filter Window Size: 3
Filter Trim: On
Filter Low Wavelen: 1100 μm
Filter High Waven: 200 μm
Filter Low Freq: 0.90909 1 / mm
Filter High Freq: 5.0000 1 / mm
[平均傾斜角及びPVの算出]
 上記にて測定及び解析された表面形状から幅100μmの断面プロファイルを20箇所取得し、最大値及び最小値を切り捨てた18箇所の平均傾斜角の平均を、実施例及び比較例の表面保護板の境界の平均傾斜角とした。また、平均傾斜角を算出した断面プロファイルと同一の断面プロファイルを用い、各断面プロファイルから標高の最大値と最小値との差(PV)を算出し、最大値及び最小値を切り捨てた18箇所のPVの平均を、実施例及び比較例の表面保護板の境界のPVの平均とした。
[Calculation of average tilt angle and PV]
From the surface shapes measured and analyzed above, 20 cross-sectional profiles with a width of 100 μm were obtained, and the average of the average inclination angles of 18 locations with the maximum and minimum values cut off was calculated for the surface protection plates of Examples and Comparative Examples. The average inclination angle of the boundary was used. In addition, using the same cross-section profile as the cross-section profile for which the average inclination angle was calculated, the difference (PV) between the maximum and minimum values of altitude was calculated from each cross-section profile, and the maximum and minimum values were rounded down to 18 locations. The average of PV was taken as the average of PV at the boundary of the surface protection plates of Examples and Comparative Examples.
1-2.全光線透過率
 JIS K7361-1:1997に準拠して、表面保護板の着色層を有する領域と、着色層を有さない箇所の全光線透過率を測定した。光入射面は機能層B側とした。測定装置はヘイズメーター(型番:HM-150、村上色彩技術研究所製)を用いた。
1-2. Total light transmittance In accordance with JIS K7361-1: 1997, the total light transmittance of the region having the colored layer of the surface protective plate and the portion not having the colored layer was measured. The light incident surface was on the functional layer B side. A haze meter (model number: HM-150, manufactured by Murakami Color Technology Research Institute) was used as the measuring device.
1-3.ハードコート層A及びハードコート層Bの算術平均粗さ
 実施例及び比較例で得られた表面保護板に関して、ハードコート層Aの算術平均粗さ(Ra-A)及びハードコート層Bの算術平均粗さ(Ra-B)をJIS B0601:2001に準拠して測定した。カットオフ値(λc)は0.8mmとした。表面粗さ測定器は、小坂研究所株式会社製の型番「ET-4000L」を用いた。なお、触針及び測定条件は下記の通りとした。
1-3. Arithmetic Mean Roughness of Hard Coat Layer A and Hard Coat Layer B Arithmetic Mean Roughness (Ra-A) of Hard Coat Layer A and Arithmetic Mean of Hard Coat Layer B with respect to the surface protection plates obtained in Examples and Comparative Examples. Roughness (Ra-B) was measured according to JIS B0601: 2001. The cutoff value (λc) was set to 0.8 mm. As the surface roughness measuring instrument, the model number "ET-4000L" manufactured by Kosaka Research Institute Co., Ltd. was used. The stylus and measurement conditions were as follows.
[表面粗さ検出部の触針]
 小坂研究所社製の商品名ET1480(先端曲率半径:0.5μm、材質:ダイヤモンド)
[表面粗さ測定器の測定条件]
・基準長さ(粗さ曲線のカットオフ値λc):0.8mm
・評価長さ(基準長さ(カットオフ値λc)×5):4.0mm
・触針の送り速さ:0.1mm/s
・予備長さ:(カットオフ値λc)×1
・縦倍率:10000倍
・横倍率:100倍
・フィルタ特性:ガウス
・レベリング:なし
・λsフィルタ:なし
・サンプリングモード:c=1500
[Needle of surface roughness detector]
Product name ET1480 manufactured by Kosaka Research Institute (tip radius of curvature: 0.5 μm, material: diamond)
[Measurement conditions of surface roughness measuring instrument]
-Reference length (cutoff value of roughness curve λc): 0.8 mm
-Evaluation length (reference length (cutoff value λc) x 5): 4.0 mm
・ Feeding speed of stylus: 0.1 mm / s
-Preliminary length: (cutoff value λc) x 1
-Vertical magnification: 10000 times-Horizontal magnification: 100 times-Filter characteristics: Gauss-Leveling: None-λs filter: None-Sampling mode: c = 1500
1-4.鉛筆硬度
 鉛筆引硬度は、作製した表面保護板を、温度25℃、相対湿度60%の条件で2時間調湿した後、JIS-S-6006が規定する試験用鉛筆を用い、作製した表面保護板の表面側(機能層A側)の面および背面側(機能層B側)の面において、JIS K5600-5-4(1999)に規定する鉛筆硬度試験(4.9N荷重)を行い、傷がつかない最も高い鉛筆硬度を評価した。
1-4. Pencil hardness Pencil pull hardness is the surface protection prepared by using a test pencil specified by JIS-S-6006 after adjusting the humidity of the prepared surface protection plate for 2 hours under the conditions of temperature 25 ° C and relative humidity 60%. A pencil hardness test (4.9 N load) specified in JIS K5600-5-4 (1999) was performed on the front surface side (functional layer A side) and the back surface side (functional layer B side) of the plate to scratch the plate. The highest pencil hardness that does not stick was evaluated.
1-5.評価
[視認性]
 実施例及び比較例で得られた積層部材のプラスチックフィルム側の面を画像表示装置(Apple社製の商品名iPad(登録商標) Air、解像度:264ppi)の表面に配置し、白色画像を表示した。着色層を有する領域と着色層を有さない領域との境界付近の画像と、前記境界から離れた箇所との画像とを対比し、画像の色味が異なって感じるものを1点、どちらともいえないものを2点、画像の色味が異なって感じないものを3点として、20人の被験者による平均点を算出しし、下記の基準でランク付けした。
<ランク>
A:平均点が2.5以上
B:平均点が1.5以上2.5未満
C:平均点が1.5未満
1-5. Evaluation [Visibility]
The surface of the laminated member obtained in Examples and Comparative Examples on the plastic film side was arranged on the surface of an image display device (trade name iPad (registered trademark) Air manufactured by Apple Inc., resolution: 264 ppi), and a white image was displayed. .. By comparing the image near the boundary between the region with the colored layer and the region without the colored layer with the image at the location away from the boundary, one point where the color of the image feels different is one point, both. The average score of 20 subjects was calculated and ranked according to the following criteria, with 2 points being unspeakable and 3 points being not felt because the color of the image was different.
<Rank>
A: Average score is 2.5 or more B: Average score is 1.5 or more and less than 2.5 C: Average score is less than 1.5
2.塗布液の調製
 下記の塗布液を調製した。なお、「部」及び「%」は質量基準である。
<ハードコート層用塗布液1>
・ウレタンアクリレート系紫外線硬化樹脂組成物 100部
(固形分35質量%、トルエン/酢酸エチル混合溶剤)
<感熱接着層用塗布液1>
・塩化ビニル酢酸ビニル共重合体(商品名「ST-P Aワニス」、DNPファインケミカル社製、固形分30%) 100質量部
・希釈溶剤(メチルエチルケトン、トルエン) 適量
<低屈折率層用塗布液1>
・光重合開始剤 0.1質量部
(IGM Resins社製、商品名「Omnirad 127」)
・紫外線硬化性樹脂 1.1質量部
(3~4官能のアルコキシ化ペンタエリスリトールアクリレート、新中村化学工業社製、商品名「NKエステル ATM-4PL」)
・中空シリカ 6.3質量部(有効成分:1.3質量部)
(平均粒子径60nm)
・中実シリカ 0.9質量部(有効成分:0.3質量部)
(平均粒子径12nm)
・フッ素系防汚剤 0.1質量部(有効成分:0.005質量部)
(DIC社製、商品名「メガファック F-568」)
・希釈溶剤 91.5質量部
(メチルイソブチルケトンとプロピレングリコールモノメチルエーテルアセテートとの9:1混合溶剤)
2. 2. Preparation of coating solution The following coating solution was prepared. In addition, "part" and "%" are based on mass.
<Coating liquid for hard coat layer 1>
-Urethane acrylate-based UV curable resin composition 100 parts (solid content 35% by mass, toluene / ethyl acetate mixed solvent)
<Coating liquid for thermal adhesive layer 1>
-Vinyl chloride vinyl acetate copolymer (trade name "ST-PA varnish", manufactured by DNP Fine Chemical Co., Ltd., solid content 30%) 100 parts by mass-Diluting solvent (methyl ethyl ketone, toluene) Appropriate amount <Coating solution for low refractive index layer 1 >
-Photopolymerization initiator 0.1 parts by mass (manufactured by IGM Resins, trade name "Omnirad 127")
-UV curable resin 1.1 parts by mass (3-4 functional alkoxylated pentaerythritol acrylate, manufactured by Shin-Nakamura Chemical Industry Co., Ltd., trade name "NK ester ATM-4PL")
-Hollow silica 6.3 parts by mass (active ingredient: 1.3 parts by mass)
(Average particle size 60 nm)
-Solid silica 0.9 parts by mass (active ingredient: 0.3 parts by mass)
(Average particle size 12 nm)
-Fluorine-based antifouling agent 0.1 parts by mass (active ingredient: 0.005 parts by mass)
(Product name "Mega Fuck F-568" manufactured by DIC Corporation)
91.5 parts by mass of diluting solvent (9: 1 mixed solvent of methyl isobutyl ketone and propylene glycol monomethyl ether acetate)
3.転写シートの作製
[転写シート1]
 厚み50μmのポリエチレンテレフタレートフィルム上に、離型性を有する凹凸層が形成されてなる離型シート1を準備した。
 次いで、離型シート1の凹凸層を有する側の面に、ハードコート用塗布液1を乾燥後の厚みが5μmとなるように、塗布、乾燥、紫外線照射(照射量50mJ/cm)して、ハードコート層Aを形成した。次いで、ハードコート層A上に、感熱接着層用塗布液1を乾燥後の厚みが2μmとなるように、塗布、乾燥して、感熱性を有する接着層Aを形成し、転写シート1を得た。
3. 3. Preparation of transfer sheet [Transfer sheet 1]
A release sheet 1 having an uneven layer having releasability formed on a polyethylene terephthalate film having a thickness of 50 μm was prepared.
Next, the surface of the release sheet 1 having the uneven layer was coated, dried, and irradiated with ultraviolet rays (irradiation amount: 50 mJ / cm 2 ) so that the thickness of the hard coat coating liquid 1 after drying was 5 μm. , The hard coat layer A was formed. Next, the coating liquid 1 for the heat-sensitive adhesive layer is applied and dried on the hard coat layer A so that the thickness after drying is 2 μm to form the adhesive layer A having heat sensitivity, and the transfer sheet 1 is obtained. It was.
[転写シート2]
 厚み50μmの離型性を有するポリエチレンテレフタレートフィルム(離型シート2、離型性を有する側の面は実質的に平滑)を準備した。
 次いで、離型シート2の離型性を有する側の面に、ハードコート用塗布液1を乾燥後の厚みが5μmとなるように、塗布、乾燥、紫外線照射(照射量50mJ/cm)して、ハードコート層Bを形成した。次いで、ハードコート層B上に、感熱接着層用塗布液1を乾燥後の厚みが2μmとなるように、塗布、乾燥して、感熱性を有する接着層Bを形成した。
 次いで、接着層B上の一部に、黒色のインクリボン(総厚み3μm)を溶融熱転写して着色層を形成し、転写シート2を得た。
[Transfer sheet 2]
A polyethylene terephthalate film having a releasability of 50 μm in thickness (release sheet 2, the surface on the releasable side is substantially smooth) was prepared.
Next, the surface of the release sheet 2 having the releasability was coated, dried, and irradiated with ultraviolet rays (irradiation amount 50 mJ / cm 2 ) so that the thickness of the hard coat coating liquid 1 after drying was 5 μm. The hard coat layer B was formed. Next, the coating liquid 1 for the heat-sensitive adhesive layer was applied and dried on the hard coat layer B so that the thickness after drying was 2 μm to form the adhesive layer B having heat sensitivity.
Next, a black ink ribbon (total thickness 3 μm) was melt-heat-transferred onto a part of the adhesive layer B to form a colored layer, and a transfer sheet 2 was obtained.
[転写シート3]
 接着層B上に着色層を形成しなかった以外は、転写シート2と同様にして、転写シート3を得た。
[Transfer Sheet 3]
A transfer sheet 3 was obtained in the same manner as the transfer sheet 2 except that a colored layer was not formed on the adhesive layer B.
4.積層フィルムの作製
[積層フィルム1]
 厚み250μmのアクリルフィルム上に、ハードコート用塗布液1を乾燥後の厚みが4μmとなるように、塗布、乾燥、紫外線照射して、ハードコート層Aを形成した。
 次いで、ハードコート層A上に、低屈折率層用塗布液1を乾燥後の厚みが100nmとなるように、塗布、乾燥、紫外線照射して、低屈折率層の単層の反射防止層Aを形成し、フィルム層A(ポリエチレンテレフタレートフィルム)、ハードコート層A及び反射防止層A(低屈折率層の単層)をこの順に有する、積層フィルム1を得た。
 なお、低屈折率層用塗布液1から低屈折率層の屈折率は1.30であった。
4. Fabrication of laminated film [laminated film 1]
A hard coat layer A was formed by applying, drying, and irradiating ultraviolet rays on an acrylic film having a thickness of 250 μm so that the thickness of the hard coat coating liquid 1 after drying was 4 μm.
Next, the coating liquid 1 for the low refractive index layer 1 is coated, dried, and irradiated with ultraviolet rays on the hard coat layer A so that the thickness after drying becomes 100 nm, and the single antireflection layer A of the low refractive index layer A is irradiated. A laminated film 1 having a film layer A (polyethylene terephthalate film), a hard coat layer A, and an antireflection layer A (a single layer of a low refractive index layer) in this order was obtained.
The refractive index of the low refractive index layer coating liquid 1 to the low refractive index layer was 1.30.
5.表面保護板及び積層部材の作製
[実施例1]
 上下一組のインモールド成形用金型の一方の側に、上記「3」で作製した転写シート1を配置し、該金型の他方の側に、上記「3」で作製した転写シート2を配置した。なお、転写シート1及び2は、離型シートとは反対側の面が金型の内側(射出樹脂と接する側)を向くように配置した。
 次いで、金型を締め、金型内に射出樹脂(ポリカーボネート樹脂)を注入し、転写シート1の離型シートとは反対側の面と、前記射出樹脂を含むコア層(厚み2.0mm)と、前記転写シート2の離型シートとは反対側の面とを密着させた積層体Xを得た。
 次いで、金型を開けた後、積層体Xから転写シート1及び転写シート2の離型シートを剥離した。
 次いで、紫外線照射(照射量800mJ/cm)して、ハードコート層A及びBの硬化を促進させ、実施例1の表面保護板を得た。実施例1の表面保護板は、表面側から背面側に向けて、ハードコート層A(表面に凹凸形状を有するハードコート層)、接着層A、コア層、着色層(注:着色層は全面ではなく部分的に形成されている)、接着層B、ハードコート層Bをこの順に有するものであった。
 なお、実施例1の表面保護板は、着色層の機能層B(接着層B)側の面の位置と、着色層を有さない領域における前記コア層の機能層B(接着層B)側の面の位置とが、表面保護板の厚み方向において実質的に同一であるものであった。
5. Fabrication of surface protection plate and laminated member [Example 1]
The transfer sheet 1 produced in the above "3" is placed on one side of a pair of upper and lower in-mold molding dies, and the transfer sheet 2 produced in the above "3" is placed on the other side of the mold. Placed. The transfer sheets 1 and 2 were arranged so that the surface opposite to the release sheet faces the inside of the mold (the side in contact with the injection resin).
Next, the mold is closed, the injection resin (polycarbonate resin) is injected into the mold, and the surface of the transfer sheet 1 opposite to the release sheet and the core layer (thickness 2.0 mm) containing the injection resin are formed. , A laminated body X in which the surface of the transfer sheet 2 opposite to the release sheet was in close contact was obtained.
Next, after opening the mold, the transfer sheet 1 and the release sheet of the transfer sheet 2 were peeled off from the laminate X.
Next, ultraviolet irradiation (irradiation amount 800 mJ / cm 2 ) was performed to accelerate the curing of the hard coat layers A and B, and the surface protective plate of Example 1 was obtained. The surface protective plate of Example 1 has a hard coat layer A (a hard coat layer having an uneven shape on the surface), an adhesive layer A, a core layer, and a colored layer (Note: the colored layer is the entire surface) from the front surface side to the back surface side. It had the adhesive layer B and the hard coat layer B in this order.
The surface protective plate of Example 1 has the position of the surface of the colored layer on the functional layer B (adhesive layer B) side and the functional layer B (adhesive layer B) side of the core layer in the region without the colored layer. The positions of the surfaces were substantially the same in the thickness direction of the surface protective plate.
 次いで、実施例1の表面保護板の背面側(ハードコート層B側)の面に、光学粘着層(パナック社製、商品名「パナクリーンPD-S1」、厚み50μm)を介して、1枚のプラスチックフィルム(東洋紡社製の一軸延伸ポリエステルフィルム、商品名「コスモシャイン」、面内位相差(内面リタデーション):8400nm)を積層し、実施例1の積層部材を得た。 Next, one sheet was placed on the back surface side (hard coat layer B side) of the surface protective plate of Example 1 via an optical adhesive layer (manufactured by Panac, trade name "Panaclean PD-S1", thickness 50 μm). Plastic film (uniaxially stretched polyester film manufactured by Toyobo Co., Ltd., trade name "Cosmo Shine", in-plane retardation (inner surface retardation): 8400 nm) was laminated to obtain a laminated member of Example 1.
[実施例2]
 上下一組の射出成形用金型の一方の側に、上記「4」で作製した積層フィルム1を配置し、該金型の他方の側に、上記「3」で作製した転写シート2を配置した。なお、積層フィルム1は、フィルム層の側の面が金型の内側(射出樹脂と接する側)を向くように配置した。また、転写シート2は、離型シートとは反対側の面が金型の内側(射出樹脂と接する側)を向くように配置した。
 次いで、金型を締め、金型内に射出樹脂(ポリカーボネート樹脂)を注入し、前記積層フィルム1のフィルム層A側の面と、前記射出樹脂を含むコア層(厚み2.0mm)と、前記転写シート2の離型シートとは反対側の面とを密着させた積層体Xを得た。
 次いで、金型を開けた後、積層体Xから転写シート2の離型シートを剥離した。
 次いで、紫外線照射(照射量800mJ/cm)して、ハードコート層A及びBの硬化を促進させ、実施例2の表面保護板を得た。実施例2の表面保護板は、表面側から背面側に向けて、反射防止層A、ハードコート層A、フィルム層A、コア層、着色層(注:着色層は全面ではなく部分的に形成されている)、接着層B、ハードコート層Bをこの順に有するものであった。
 なお、実施例2の表面保護板は、着色層の機能層B(接着層B)側の面の位置と、着色層を有さない領域における前記コア層の機能層B(接着層B)側の面の位置とが、表面保護板の厚み方向において実質的に同一であるものであった。
[Example 2]
The laminated film 1 produced in the above "4" is arranged on one side of a pair of upper and lower injection molding dies, and the transfer sheet 2 produced in the above "3" is arranged on the other side of the mold. did. The laminated film 1 was arranged so that the side surface of the film layer faces the inside of the mold (the side in contact with the injection resin). Further, the transfer sheet 2 was arranged so that the surface opposite to the release sheet faces the inside of the mold (the side in contact with the injection resin).
Next, the mold is closed, the injection resin (polycarbonate resin) is injected into the mold, the surface of the laminated film 1 on the film layer A side, the core layer (thickness 2.0 mm) containing the injection resin, and the above. A laminated body X in which the surface of the transfer sheet 2 opposite to the release sheet was in close contact was obtained.
Then, after opening the mold, the release sheet of the transfer sheet 2 was peeled off from the laminated body X.
Next, ultraviolet irradiation (irradiation amount 800 mJ / cm 2 ) was performed to accelerate the curing of the hard coat layers A and B, and the surface protective plate of Example 2 was obtained. The surface protective plate of Example 2 has an antireflection layer A, a hard coat layer A, a film layer A, a core layer, and a colored layer (Note: the colored layer is partially formed instead of the entire surface) from the front surface side to the back surface side. The adhesive layer B and the hard coat layer B were provided in this order.
The surface protective plate of Example 2 has the position of the surface of the colored layer on the functional layer B (adhesive layer B) side and the functional layer B (adhesive layer B) side of the core layer in the region without the colored layer. The positions of the surfaces were substantially the same in the thickness direction of the surface protective plate.
 次いで、実施例2の表面保護板の背面側(ハードコート層B側)の面に、光学粘着層(パナック社製、商品名「パナクリーンPD-S1」、厚み50μm)を介して、1枚のプラスチックフィルム(東洋紡社製の一軸延伸ポリエステルフィルム、商品名「コスモシャイン」、面内位相差(内面リタデーション):8400nm)を積層し、実施例2の積層部材を得た。 Next, one sheet was placed on the back surface side (hard coat layer B side) of the surface protective plate of Example 2 via an optical adhesive layer (manufactured by Panac, trade name "Panaclean PD-S1", thickness 50 μm). Plastic film (uniaxially stretched polyester film manufactured by Toyobo Co., Ltd., trade name "Cosmo Shine", in-plane retardation (inner surface retardation): 8400 nm) was laminated to obtain a laminated member of Example 2.
[参考例1]
 上下一組の射出成形用金型の一方の側に、上記「4」で作製した積層フィルム1を配置した。なお、積層フィルム1は、フィルム層の側の面が金型の内側(射出樹脂と接する側)を向くように配置した。
 次いで、金型を締め、金型内に射出樹脂(ポリカーボネート樹脂)を注入し、前記積層フィルム1のプラスチックフィルム側の面と、前記射出樹脂を含むコア層(厚み2.0mm)とを密着させた積層体Yを得た。
 次いで、金型を開けた後、積層体Yを回収した。
 次いで、積層体Yのコア層が露出した面に、上記「3」で作製した転写シート2の接着層B側の面を、ラミネートにより貼り合わせた後、転写シート2の離型シートを剥離した。
 次いで、紫外線照射(照射量800mJ/cm)して、ハードコート層A及びBの硬化を促進させ、実施例2の表面保護板を得た。実施例2の表面保護板は、表面側から背面側に向けて、反射防止層A、ハードコート層A、フィルム層A、コア層、着色層(注:着色層は全面ではなく部分的に形成されている)、接着層B、ハードコート層Bをこの順に有するものであった。
 なお、参考例1の表面保護板は、機能層Bをラミネートにより形成したため、着色層の機能層B側の面の位置と、着色層を有さない領域におけるコア層の機能層B側の面の位置とが、表面保護板の厚み方向において実質的に同一ではなく、表面保護板の背面側の最表面において、着色層を有する領域と、着色層を有さない領域との境界に傾斜を有していた。
[Reference example 1]
The laminated film 1 produced in "4" above was placed on one side of a pair of upper and lower injection molding dies. The laminated film 1 was arranged so that the side surface of the film layer faces the inside of the mold (the side in contact with the injection resin).
Next, the mold is tightened, an injection resin (polycarbonate resin) is injected into the mold, and the surface of the laminated film 1 on the plastic film side and the core layer (thickness 2.0 mm) containing the injection resin are brought into close contact with each other. A laminate Y was obtained.
Then, after opening the mold, the laminated body Y was collected.
Next, the surface of the transfer sheet 2 produced in "3" on the adhesive layer B side was bonded to the exposed surface of the core layer of the laminate Y by laminating, and then the release sheet of the transfer sheet 2 was peeled off. ..
Next, ultraviolet irradiation (irradiation amount 800 mJ / cm 2 ) was performed to accelerate the curing of the hard coat layers A and B, and the surface protective plate of Example 2 was obtained. The surface protective plate of Example 2 has an antireflection layer A, a hard coat layer A, a film layer A, a core layer, and a colored layer (Note: the colored layer is partially formed instead of the entire surface) from the front surface side to the back surface side. The adhesive layer B and the hard coat layer B were provided in this order.
Since the surface protection plate of Reference Example 1 is formed by laminating the functional layer B, the position of the surface of the colored layer on the functional layer B side and the surface of the core layer on the functional layer B side in the region without the colored layer. The positions of are not substantially the same in the thickness direction of the surface protective plate, and an inclination is formed at the boundary between the region having the colored layer and the region having no colored layer on the outermost surface on the back surface side of the surface protective plate. Had had.
 次いで、参考例1の表面保護板の背面側(ハードコート層B側)の面に、光学粘着層(パナック社製、商品名「パナクリーンPD-S1」、厚み50μm)を介して、1枚のプラスチックフィルム(東洋紡社製の一軸延伸ポリエステルフィルム、商品名「コスモシャイン」、面内位相差(内面リタデーション):8400nm)を積層し、参考例1の積層部材を得た。 Next, one sheet was placed on the back surface side (hard coat layer B side) of the surface protective plate of Reference Example 1 via an optical adhesive layer (manufactured by Panac, trade name "Panaclean PD-S1", thickness 50 μm). Plastic film (uniaxially stretched polyester film manufactured by Toyobo Co., Ltd., trade name "Cosmo Shine", in-plane retardation (inner surface retardation): 8400 nm) was laminated to obtain a laminated member of Reference Example 1.
[比較例1]
 上下一組のインモールド成形用金型の一方の側に、上記「3」で作製した転写シート1を配置し、該金型の他方の側に、上記「3」で作製した転写シート3を配置した。なお、転写シート1及び3は、離型シートとは反対側の面が金型の内側(射出樹脂と接する側)を向くように配置した。
 次いで、金型を締め、金型内に射出樹脂(ポリカーボネート樹脂)を注入し、転写シート1の離型シートとは反対側の面と、前記射出樹脂を含むコア層(厚み2.0mm)と、前記転写シート3の離型シートとは反対側の面とを密着させた積層体Xを得た。
 次いで、金型を開けた後、積層体Xから転写シート1及び転写シート2の離型シートを剥離した。
 次いで、紫外線照射(照射量800mJ/cm)して、ハードコート層A及びBの硬化を促進させた。
 次いで、ハードコート層B側の面の一部に、スクリーン印刷により厚み3μmの黒色の着色層を形成し、比較例1の表面保護板を得た。比較例1の表面保護板は、表面側から背面側に向けて、ハードコート層A(表面に凹凸形状を有するハードコート層)、接着層A、コア層、接着層B、ハードコート層B、着色層(注:着色層は全面ではなく部分的に形成されている)をこの順に有するものであった。
[Comparative Example 1]
The transfer sheet 1 produced in the above "3" is placed on one side of a pair of upper and lower in-mold molding dies, and the transfer sheet 3 produced in the above "3" is placed on the other side of the mold. Placed. The transfer sheets 1 and 3 were arranged so that the surface opposite to the release sheet faces the inside of the mold (the side in contact with the injection resin).
Next, the mold is closed, the injection resin (polycarbonate resin) is injected into the mold, and the surface of the transfer sheet 1 opposite to the release sheet and the core layer (thickness 2.0 mm) containing the injection resin are formed. , A laminated body X in which the surface of the transfer sheet 3 opposite to the release sheet was in close contact was obtained.
Next, after opening the mold, the transfer sheet 1 and the release sheet of the transfer sheet 2 were peeled off from the laminate X.
Next, ultraviolet irradiation (irradiation amount 800 mJ / cm 2 ) was performed to accelerate the curing of the hard coat layers A and B.
Next, a black colored layer having a thickness of 3 μm was formed on a part of the surface on the hard coat layer B side by screen printing to obtain a surface protective plate of Comparative Example 1. The surface protective plate of Comparative Example 1 has a hard coat layer A (a hard coat layer having an uneven shape on the surface), an adhesive layer A, a core layer, an adhesive layer B, and a hard coat layer B from the front surface side to the back surface side. It had a colored layer (Note: the colored layer was partially formed instead of the entire surface) in this order.
 次いで、比較例1の表面保護板の背面側(ハードコート層B側)の面に、光学粘着層(パナック社製、商品名「パナクリーンPD-S1」、厚み50μm)を介して、1枚のプラスチックフィルム(東洋紡社製の一軸延伸ポリエステルフィルム、商品名「コスモシャイン」、面内位相差(内面リタデーション):8400nm)を積層し、比較例1の積層部材を得た。 Next, one sheet was placed on the back surface side (hard coat layer B side) of the surface protective plate of Comparative Example 1 via an optical adhesive layer (manufactured by Panac, trade name "Panaclean PD-S1", thickness 50 μm). Plastic film (uniaxially stretched polyester film manufactured by Toyobo Co., Ltd., trade name "Cosmo Shine", in-plane retardation (inner surface retardation): 8400 nm) was laminated to obtain a laminated member of Comparative Example 1.
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000001
 表1から明らかなように、実施例1及び2の表面保護板は、背面に粘着層を介してプラスチックフィルムを含む機能性部材を貼り合わせた際の視認性の低下を抑制できることが確認できる。
 なお、参考例1は、機能層Bをラミネートで形成したことから、表面保護板の背面側の最表面において、着色層を有する領域と、着色層を有さない領域との境界に傾斜を有していたため、実施例1及び2と比較して視認性が劣る結果となった。
As is clear from Table 1, it can be confirmed that the surface protective plates of Examples 1 and 2 can suppress a decrease in visibility when a functional member containing a plastic film is attached to the back surface via an adhesive layer.
In Reference Example 1, since the functional layer B is formed by laminating, the boundary between the region having the colored layer and the region not having the colored layer is inclined on the outermost surface on the back surface side of the surface protective plate. As a result, the visibility was inferior to that of Examples 1 and 2.
 10:コア層
20A:機能層A
20B:機能層B
21A:ヒートシール層A
21B:ヒートシール層B
22A:ハードコート層A
22B:ハードコート層B
23A:反射防止層A
24A:フィルム層A
 30:着色層
 40:粘着層
 50:プラスチックフィルム
100:表面保護板
200:積層部材
10: Core layer 20A: Functional layer A
20B: Functional layer B
21A: Heat seal layer A
21B: Heat seal layer B
22A: Hard coat layer A
22B: Hard coat layer B
23A: Antireflection layer A
24A: Film layer A
30: Colored layer 40: Adhesive layer 50: Plastic film 100: Surface protection plate 200: Laminated member

Claims (15)

  1.  表面側から背面側に向けて、機能層A、樹脂を主成分とするコア層、機能層Bをこの順に有してなり、さらに、前記コア層の前記機能層B側の面の一部に着色層を有してなる、表面保護板。 A functional layer A, a core layer containing a resin as a main component, and a functional layer B are provided in this order from the front surface side to the back surface side, and further, a part of the surface of the core layer on the functional layer B side. A surface protective plate having a colored layer.
  2.  前記着色層の前記機能層B側の面の位置と、前記着色層を有さない領域における前記コア層の前記機能層B側の面の位置とが、前記表面保護板の厚み方向において実質的に同一である、請求項1に記載の表面保護板。 The position of the surface of the colored layer on the functional layer B side and the position of the surface of the core layer on the functional layer B side in the region without the colored layer are substantially in the thickness direction of the surface protective plate. The surface protective plate according to claim 1, which is the same as the above.
  3.  前記表面保護板の背面側の最表面における、前記着色層を有する領域と前記着色層を有さない領域との境界の平均傾斜角が0.10度以下である、請求項1又は2に記載の表面保護板。 The first or second claim, wherein the average inclination angle of the boundary between the region having the colored layer and the region not having the colored layer on the outermost surface on the back surface side of the surface protective plate is 0.10 degrees or less. Surface protection plate.
  4.  前記着色層を有する領域の全光線透過率が2%以下である、請求項1~3の何れか1項に記載の表面保護板。 The surface protective plate according to any one of claims 1 to 3, wherein the total light transmittance of the region having the colored layer is 2% or less.
  5.  前記着色層を有さない領域の全光線透過率が50%以上である、請求項1~4の何れか1項に記載の表面保護板。 The surface protective plate according to any one of claims 1 to 4, wherein the total light transmittance of the region having no colored layer is 50% or more.
  6.  前記機能層Bが、前記機能層Aとは異なる層を有する、請求項1~5の何れか1項に記載の表面保護板。 The surface protective plate according to any one of claims 1 to 5, wherein the functional layer B has a layer different from that of the functional layer A.
  7.  前記機能層Aがハードコート層Aを含み、前記機能層Bがハードコート層Bを含む、請求項1~6の何れか1項に記載の表面保護板。 The surface protective plate according to any one of claims 1 to 6, wherein the functional layer A contains a hard coat layer A and the functional layer B contains a hard coat layer B.
  8.  前記ハードコート層Aの表面の算術平均粗さをRa-A、前記ハードコート層Bの表面の算術平均粗さをRa-Bと定義した際に、Ra-A>Ra-Bの関係を満たす、請求項7に記載の表面保護板。 When the arithmetic mean roughness of the surface of the hard coat layer A is defined as Ra-A and the arithmetic average roughness of the surface of the hard coat layer B is defined as Ra-B, the relationship of Ra-A> Ra-B is satisfied. , The surface protective plate according to claim 7.
  9.  請求項1~8の何れか1項に記載の表面保護板の背面側に、粘着層を介して、少なくとも1枚のプラスチックフィルムを有する機能性部材が積層されてなる、積層部材。 A laminated member in which a functional member having at least one plastic film is laminated on the back surface side of the surface protective plate according to any one of claims 1 to 8 via an adhesive layer.
  10.  前記機能性部材の最も表面保護板側に位置するプラスチックフィルムと、前記粘着層との間にガラスを有さない、請求項9に記載の積層部材。 The laminated member according to claim 9, wherein there is no glass between the plastic film located closest to the surface protective plate side of the functional member and the adhesive layer.
  11.  前記機能性部材がタッチパネルである、請求項9又は10に記載の積層部材。 The laminated member according to claim 9 or 10, wherein the functional member is a touch panel.
  12.  表示素子上に、請求項9~11の何れか1項に記載の積層部材を有してなり、前記積層部材の前記機能性部材側の面が前記表示素子側を向くように配置してなる、画像表示装置。 The laminated member according to any one of claims 9 to 11 is provided on the display element, and the laminated member is arranged so that the surface of the laminated member on the functional member side faces the display element side. , Image display device.
  13.  下記の工程(1)~(2)を有する、表面保護板の製造方法。
    (1)一対の射出成形用金型の一方の側に、機能層Aを有してなる積層体Aを配置するとともに、前記金型の他方の側に、機能層Bを有し、前記機能層B上の一部に着色層を有してなる積層体Bを配置する工程。
    (2)前記金型を締め、前記金型内に射出樹脂を注入し、前記積層体Aと、前記射出樹脂を含むコア層と、前記積層体Bとを密着させた積層体Xを得る工程。
    A method for manufacturing a surface protective plate, which comprises the following steps (1) and (2).
    (1) The laminated body A having the functional layer A is arranged on one side of the pair of injection molding dies, and the functional layer B is provided on the other side of the mold. A step of arranging a laminated body B having a colored layer on a part of the layer B.
    (2) A step of tightening the mold and injecting an injection resin into the mold to obtain a laminate X in which the laminate A, a core layer containing the injection resin, and the laminate B are in close contact with each other. ..
  14.  前記積層体Aが離型シート上に機能層Aを有してなる転写シートAであり、前記積層体Bが離型シート上に機能層Bを有し、前記機能層B上の一部に着色層を有してなる転写シートBであり、
     前記積層体Xが前記転写シートAの離型シートとは反対側の面と、前記射出樹脂を含むコア層と、前記転写シートBの離型シートとは反対側の面とを密着させた積層体であり、
     さらに下記の工程(3)を有する、請求項13に記載の表面保護板の製造方法。
    (3)前記金型を開くとともに、前記積層体Xから転写シートAの離型シート及び転写シートBの離型シートを剥離する工程。
    The laminate A is a transfer sheet A having a functional layer A on the release sheet, and the laminate B has a functional layer B on the release sheet and is partly on the functional layer B. A transfer sheet B having a colored layer.
    Lamination in which the laminate X adheres the surface of the transfer sheet A opposite to the release sheet, the core layer containing the injection resin, and the surface of the transfer sheet B opposite to the release sheet. Is the body
    The method for manufacturing a surface protective plate according to claim 13, further comprising the following step (3).
    (3) A step of opening the mold and peeling the release sheet of the transfer sheet A and the release sheet of the transfer sheet B from the laminate X.
  15.  前記積層体Aがフィルム層Aと機能層Aとを積層した積層フィルムAであり、前記積層体Bが離型シート上に機能層Bを有し、前記機能層B上の一部に着色層を有してなる転写シートBであり、
     前記積層体Xが、前記積層フィルムAの前記機能層Aとは反対側の面と、前記射出樹脂を含むコア層と、前記転写シートBの離型シートとは反対側の面とを密着させた積層体であり、
     さらに下記の工程(3)を有する、請求項13に記載の表面保護板の製造方法。
    (3)前記金型を開くとともに、前記積層体Xから転写シートBの離型シートを剥離する工程。
    The laminated body A is a laminated film A in which a film layer A and a functional layer A are laminated, the laminated body B has a functional layer B on a release sheet, and a colored layer is partially formed on the functional layer B. Is a transfer sheet B comprising
    The laminated body X adheres the surface of the laminated film A opposite to the functional layer A, the core layer containing the injection resin, and the surface of the transfer sheet B opposite to the release sheet. It is a laminated body
    The method for manufacturing a surface protective plate according to claim 13, further comprising the following step (3).
    (3) A step of opening the mold and peeling the release sheet of the transfer sheet B from the laminated body X.
PCT/JP2020/028188 2019-07-26 2020-07-21 Surface protection panel, multilayer member and image display device each using same, and method for producing surface protection panel WO2021020222A1 (en)

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