JP2015227389A - Adhesive film for formation of printed layer and display apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an adhesive film for formation of a printed layer which does not deteriorate in reworkability even when the thickness of the whole film is decreased, is excellent in mechanical strength, has a primer layer having good adhesion to a printed layer and shows sufficient adhesive strength between a transparent member, like glass, and it and a display apparatus provided with the adhesive film.SOLUTION: In an adhesive film 100 for formation of a printed layer capable of forming a frame-like printed layer 20, there are provided a support 110, an adhesive layer 120 which is laminated on one side of the support 110 and composed of an acrylic adhesive containing an acrylic polymer and a primer layer 130 which is laminated on the other side of the support 110 and is capable of forming a printed layer 20. The thickness of the support 110 is 3-9 μm; the thickness of the adhesive layer 120 is 3-15 μm; and the total thickness of the support 110, the adhesive layer 120 and the primer layer 130 is 6-20 μm.

Description

  The present invention relates to a pressure-sensitive adhesive film for forming a printed layer on which a frame-shaped printed layer is formed, and a display device including the pressure-sensitive adhesive film.

  In display devices having displays such as smartphones, mobile phones, laptop PCs, television receivers, desktop PCs, as protective materials such as liquid crystals and materials such as substrates, transparency (light transmission), scratch resistance, Transparent members such as glass materials are widely used because of excellent gas barrier properties, dimensional stability, and the like. A printed layer is usually formed on the surface of the transparent member such as a glass material in order to show an outer frame portion of the display, a predetermined icon, a logo of a manufacturer or a sales manufacturer, and the like. Here, UV curable resins such as UV molds and UV inks are used for the printing layer, and a primer layer may be provided to improve adhesion to such UV curable resins. . This primer layer is usually provided on the surface of a support such as a PET film, and is provided in the form of a pressure-sensitive adhesive film for forming a printing layer in which an adhesive layer is provided on the opposite surface of the support.

  In the past, the above-mentioned pressure-sensitive adhesive film for forming a printed layer has a thick pressure-sensitive adhesive layer (approximately 25 to 50 μm) in order to ensure adhesive strength with a transparent member such as glass, and is a film when reworked (re-peeled). In order to ensure the mechanical strength, the support was thick (approximately 50 to 100 μm), and the overall thickness was large. If such a thick adhesive film is used and a printing layer is formed, a printing step will be very large. When a hard coat film or the like is pasted on the display surface having such a large printing step, there is a problem that bubbles are generated due to the printing step and the visibility of the display is lowered.

  In order to prevent the generation of bubbles and the like due to such a printing step, conventionally, the printing step is absorbed by devising the composition of an adhesive used for a hard coat film or the like (for example, Patent Document 1). And 2).

  Further, it has been studied to reduce the printing step by thinning the above-mentioned pressure-sensitive adhesive film for forming a printed layer. Furthermore, in recent portable electronic devices, there is a demand for downsizing and thinning along with high functionality, for example, it is required to reduce the thickness of an adhesive film used as a scattering prevention film. (Thus, even non-portable electronic devices have been required to be thin). On the other hand, as a method of thinning the pressure-sensitive adhesive film, if the pressure-sensitive adhesive layer is thinned, the adhesion between the pressure-sensitive adhesive film and a transparent member such as glass may be insufficient, and the thickness of the support is not sufficient. Since it is as large as about 50 to 100 μm, it has been mainly studied to eliminate the support itself (no support).

JP 2011-162659 A JP2012-232459A

  However, if the support is not used, the mechanical strength of the adhesive film is weakened, and the adhesive film is stuck to a transparent member such as glass. Reworkability at the time of re-attaching will deteriorate. Further, the support-less pressure-sensitive adhesive film for printing layer production is produced by transferring the pressure-sensitive adhesive layer from the carrier film, but at the time of production, problems such as defective transfer due to film breakage or the like occur. . Furthermore, it has been difficult to find a primer layer having good adhesion to both the existing pressure-sensitive adhesive layer and the print layer.

  Therefore, the present invention has been made in view of the above circumstances, and in a pressure-sensitive adhesive film for forming a printing layer, even if the thickness of the entire film is reduced, the reworkability is not deteriorated, and excellent mechanical strength is obtained. A pressure-sensitive adhesive film for forming a printed layer having a primer layer having good adhesion to the printed layer and having sufficient adhesive strength with a transparent member such as glass, and a display device provided with the pressure-sensitive adhesive film For the purpose.

  As a result of intensive studies to solve the above problems, the present inventors have used a PET film having a predetermined thickness as the support for the adhesive film for forming the printed layer, and a predetermined adhesive made of an acrylic adhesive as the adhesive layer. By using a pressure-sensitive adhesive layer with a total thickness of the support, the pressure-sensitive adhesive layer, and the primer layer within a predetermined range, and using a primer layer capable of forming a printing layer as the primer layer, the thickness of the entire film is reduced. Even if it has an excellent mechanical strength and has a primer layer with good adhesion to the printed layer, it does not deteriorate the reworkability, and has a sufficient adhesive force with a transparent member such as glass. The present inventors have found that a pressure-sensitive adhesive film for forming a printing layer is obtained, and have completed the present invention based on this finding.

That is, the present invention is a pressure-sensitive adhesive film for forming a print layer capable of forming a frame-shaped print layer, and is a support and an acrylic pressure-sensitive adhesive laminated on one side of the support and containing an acrylic polymer A pressure-sensitive adhesive layer, and a primer layer that is laminated on the other surface of the support and can form the print layer, wherein the thickness of the support is 3 to 9 μm, and the thickness of the pressure-sensitive adhesive layer Is a pressure-sensitive adhesive film for forming a print layer, wherein the support, the pressure-sensitive adhesive layer, and the primer layer have a total thickness of 6 μm to 20 μm.
Here, the said adhesive film may consist of the frame-shaped printing part in which the said printing layer is formed, and the opening part enclosed by the said printing part.
Moreover, the said adhesive film may consist of the frame-shaped printing part in which the said printing layer is formed, and the transparent non-printing part in which the said printing layer inside the said frame-shaped printing part is not formed.
In this case, it is preferable that the total haze of the non-printed part is 0.5 to 3.5.
In the pressure-sensitive adhesive film, the support is preferably made of a polyethylene terephthalate film.
Moreover, in the said adhesive film, it is preferable that the said acrylic polymer is a polymer which contains the C3-C20 (meth) acrylic-acid alkylester as a monomer component.
Moreover, the said adhesive layer may contain the coloring agent of the same color as the said printing layer.
The primer layer is preferably made of a polyester resin.
Moreover, in the said adhesive film, it is preferable that ratio of the thickness of the said support body and the thickness of the said adhesive layer is 100: 65-100: 400.
Moreover, in the said adhesive film, the said adhesive layer is affixed on smooth stainless steel (SUS304) with a 2 kg load, and the adhesive force of the 180 degree peeling at 300 mm / min after standing for 1 hour is 6N to 16N / 25 mm. It is preferable.
Moreover, in the said adhesive film, it has a peeling film on the surface on the opposite side to the surface which contact | connects the said support body of the said adhesive layer, and 180 degree peeling force in 300 mm / min of the said adhesive layer and the said peeling film is It is preferable that it is 20-500 mN / 25mm.
The present invention also provides the above-mentioned pressure-sensitive adhesive film for forming a printed layer, the printed layer formed on the primer layer side of the pressure-sensitive adhesive film for forming a printed layer, and a transparent member attached to the pressure-sensitive adhesive layer of the pressure-sensitive adhesive film. And a display device.

  According to the present invention, a PET film having a predetermined thickness is used as a support for an adhesive film for forming a printed layer, an adhesive layer having a predetermined thickness made of an acrylic adhesive is used as an adhesive layer, and the support and the adhesive layer are used. Even if the total thickness of the primer layer is within a predetermined range and a primer layer capable of forming a printing layer as a primer layer is used, even if the thickness of the entire film is reduced, the reworkability is not deteriorated and is excellent. A pressure-sensitive adhesive film for forming a printed layer having a mechanical strength, a primer layer having good adhesion to the printed layer, and sufficient adhesive strength with a transparent member such as glass, and a display including the pressure-sensitive adhesive film An apparatus can be provided.

It is a top view which shows the whole structure of the adhesive film for printing layer formation which concerns on 1st Embodiment of this invention. It is sectional drawing which cut | disconnected the adhesive film for printing layer formation shown in FIG. 1 by the II-II line. It is a top view which shows the state by which the printing layer was formed in the adhesive film for printing layer formation based on the same form affixed on glass. It is sectional drawing which cut | disconnected the adhesive film for printing layer forming affixed on the glass shown in FIG. 3 by the IV-IV line. It is a top view which shows the whole structure of the adhesive film for printed layer formation which concerns on 2nd Embodiment of this invention. It is sectional drawing which cut | disconnected the adhesive film for printing layer formation shown in FIG. 5 by the VI-VI line. It is a top view which shows the state by which the printing layer was formed in the adhesive film for printing layer formation based on the same form affixed on glass. It is sectional drawing which cut | disconnected the adhesive film for printing layer affixed on the glass shown in FIG. 7 by the VIII-VIII line.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. Note that in the present specification and drawings, components having the same reference numerals have substantially the same structure or function.

In addition, the adhesive film for printing layer formation which concerns on the suitable form of this invention is demonstrated in the following orders.
DESCRIPTION OF SYMBOLS 1 1st Embodiment 1-1 The structure of an adhesive film 1-2 The manufacturing method of an adhesive film 1-3 The use 2 of an adhesive film 2nd Embodiment 2-1 The structure of an adhesive film 2-2 The manufacturing method of an adhesive film 2-3 Application of adhesive film

<< First Embodiment >>
First, the adhesive film for forming a printed layer according to the first embodiment of the present invention will be described. The pressure-sensitive adhesive film for forming a printed layer according to the present embodiment is a pressure-sensitive adhesive film in which a frame-like (frame-like) printed layer is formed in a state of being attached to a transparent member such as glass. This is a form including a frame-shaped printing part to be formed and an opening surrounded by the printing part. Hereinafter, the configuration, the manufacturing method, and the application of the pressure-sensitive adhesive film for forming a printed layer according to the present embodiment will be described in the order.

<Configuration of adhesive film 100>
First, with reference to FIGS. 1 to 4, the configuration of the pressure-sensitive adhesive film 100 for forming a printed layer according to the present embodiment (hereinafter sometimes simply referred to as “pressure-sensitive adhesive film 100”) will be described. FIG. 1 is a plan view showing an overall configuration of an adhesive film 100 according to this embodiment. FIG. 2 is a cross-sectional view of the adhesive film 100 shown in FIG. 1 cut along the line II-II. FIG. 3 is a plan view showing a state in which a printed layer is formed on the adhesive film 100 attached to glass. FIG. 4 is a cross-sectional view of the adhesive film 100 attached to the glass shown in FIG. 3 taken along line IV-IV.

[overall structure]
As shown in FIG. 1, the adhesive film 100 according to this embodiment includes a printing unit 101 and an opening 103. The printing unit 101 has a frame-like shape and is a part (region) where a printing layer 20 described later is formed. The opening 103 is a part surrounded by the frame-like printing unit 101 (inside the frame) Area). As shown in FIG. 2, the printing unit 101 includes a support 110, an adhesive layer 120 laminated on one surface of the support 110, and the other surface of the support 110 (adhesive layer 120 and A five-layer structure comprising a primer layer 130 laminated on the opposite surface), a release film 140 laminated on the surface of the pressure-sensitive adhesive layer 120, and a protective film 150 laminated on the surface of the primer layer 130. doing. Although details of each layer will be described later, usually, for example, first, after the roll-shaped adhesive film 100 is cut into a flat plate, the protective film 150 is peeled off from the primer layer 130, and the printing layer 20 is formed on the surface of the primer layer 130. It is formed. Next, the adhesive film 100 on which the printed layer 20 is formed is cut into a desired size (to fit the size of the glass 10). Furthermore, after the release film 140 of the adhesive film 100 cut to a desired size is peeled from the adhesive layer 120, the adhesive layer 120 is pressed against the surface of the glass 10 of the display device, so that the adhesive layer 120 is pressed. Expresses adhesive force, and the adhesive film 100 on which the printed layer 20 is formed is attached to the glass 10 (for example, a surface protective glass for protecting the liquid crystal panel and the touch panel of the display device 1). If the object of the present invention can be achieved, the printing layer 20 may be formed on the primer layer 130 after the adhesive film 100 is first attached to the glass 10.

  The state where the printing layer 20 is formed as described above is shown in FIGS. As shown in FIG. 3, the printing layer 20 is formed on the surface of the primer layer 130 of the printing unit 101 and has a frame shape. Note that the printing layer 20 may be formed so as to cover the entire printing unit 101, or as shown in FIG. 3, the printing layer 20 may be formed so as to cover a part of the printing unit 101. Good. Examples of the print layer 20 include an outer frame (also referred to as “black frame”, “picture frame”, and “print frame”) 20a, a logo 20b, an icon 20c, and the like. The present invention is not limited to this as long as it is for performing predetermined printing on the apparatus 1. The outer frame 20a is colored in black, white, and other colors, and the display panel or touch panel (resistive film type, capacitance type, etc.) such as an electronic device liquid crystal display or an organic EL display is not particularly limited. ) And the like, and for preventing the illumination light emitted from the display panel provided behind the touch panel (not shown) from leaking out from the periphery of the display panel. , Provided to shield the periphery of the display panel. Further, the logo 20b indicates a trade name of a manufacturer or a sales maker of the display device 1 or a product name. Further, the icon 20 c indicates an operation button or the like used for input to the display device 1.

(Glass 10)
The glass 10 to which the adhesive film 100 according to the present embodiment is attached is an example of the transparent member according to the present invention, and the transparent member according to the present invention has light transmittance that can be used on the surface of the display unit. In addition to glass, transparent resin (for example, acrylic resin, styrene resin, styrene-acrylic copolymer, polyurethane resin, polyester resin, epoxy resin, cellulose resin, vinyl acetate resin, chloride) Vinyl-vinyl acetate copolymer, polyvinyl butyral resin, cycloolefin resin, norbornene resin, etc.). Applications of the glass 10 include a smartphone, a mobile phone, a tablet PC (Personal Computer), a laptop PC, a digital still camera, a digital video camera, a portable GPS (Global Positioning System), a portable music player, and a portable DVD player. The glass is not particularly limited as long as it is glass used for an electronic device (display device) having a display such as an electronic dictionary, a PDA (Personal Digital Assistant), a television receiver, and a desktop PC. However, as will be described later, considering that the thickness of the adhesive film 100 is thin, the glass 10 is preferably used, for example, a cover glass provided on the outer surface of the display device 1 to protect the display or the touch panel. It is.

  Further, the material of the glass 10 is not particularly limited, but when used for applications such as the cover glass, the glass 10 is a method called a chemical strengthening method, a chemical strengthening method, an ion exchange strengthening method, or the like. It is preferable that the glass is a chemically strengthened glass whose glass surface is reinforced.

(Print layer 20)
As shown in FIG. 4, the print layer 20 includes a mold layer 21 and a colored layer 23. The mold layer 21 is formed on the primer layer 130 and is a mold for forming a printing pattern of printing by the colored layer 23 (for example, a mold for defining the form of the outer frame 20a, the logo 20b, the icon 20c, etc.) In addition, the colored layer 23 is laminated on the mold layer 21 to show the above-described outer frame 20a, logo 20b, icon 20c, etc. The mold layer 21 is not necessarily provided. The colored layer 23 may be printed directly on the primer layer 130. In this case, the printed layer 20 is composed only of the colored layer 23.

  The mold layer 21 can be formed, for example, by applying and drying a paint made of a resin composition containing a photocurable resin as a main resin by screen printing, letterpress printing, or the like. The colored layer 23 can be formed, for example, by applying and drying a paint composed of a resin composition containing a colorant such as a light-shielding black pigment and a binder resin. As a method for applying the paint, known methods such as screen printing and letterpress printing can be used and are not particularly limited. The binder resin in the paint for forming the colored layer 23 may be the same as the photocurable resin that can be used as the main resin in the paint for forming the mold layer 21 or may be another curable resin. .

  Here, it is preferable to use an acrylic photocurable resin as the photocurable resin contained in the coating material for forming the printing layer 20 (the mold layer 21 and the colored layer 23). Since the acrylic photocurable resin can increase the crosslinking density, the hardness (mechanical strength) of the printing layer 20 can be increased. In this embodiment, since a polyester-based resin is used as the primer layer 130, the use of an acrylic photo-curing resin can further improve the adhesion between the primer layer 130 and the printing layer 20. it can.

  Moreover, as a coloring agent which can be used for the colored layer 23, pigments and dyes of glossy, white and various chromatic colors can be used in addition to the black pigment. As the black pigment, for example, carbon black, graphite, aniline black, cyanine black, titanium black, black iron oxide, chromium oxide, manganese oxide and the like can be used alone or in combination of two or more.

  Here, as shown in FIG. 4, when the thickness of the adhesive film 100 is thick, the printing level difference D will be increased accordingly. Therefore, in this embodiment, the total thickness of the pressure-sensitive adhesive film 100 in a state where the printing layer 20 is formed, excluding the release film 140 and the protective film 150 described later, that is, the support 110, the pressure-sensitive adhesive layer 120, and the primer described later. The printing step D is reduced by reducing the total thickness of the layer 130. In order to reduce the total thickness of the pressure-sensitive adhesive film 100, in this embodiment, the thickness of the support 110 and the thickness of the pressure-sensitive adhesive layer 120 that have not been conventionally achieved are realized (not support-less). Hereinafter, the configuration of each layer of the pressure-sensitive adhesive film 100 according to this embodiment will be described in detail.

[Support 110]
The support 110 supports an adhesive layer 120 and a primer layer 130 described later. The support 110 is not particularly limited, and examples thereof include a polyethylene terephthalate (PET) film, a polyethylene terephthalate (PEN) film, and a cyclic polyolefin (COP) film. Among these, the support 110 is preferably made of a polyethylene terephthalate (PET) film. Thus, since the support 110 is made of a PET film, the support 110 has sufficient strength even when the thickness of the support 110 is reduced to 3 to 9 μm, as will be described later. The processability is not lowered and the processability is excellent. Moreover, since the support body 110 consists of PET film, it can have sufficient adhesiveness with both the adhesive layer 120 which consists of an acrylic adhesive, and the primer layer 130 which consists of a polyester-type resin. Thereby, it becomes possible to realize the strong adhesive force and peeling force described later.

  The support 110 may have a single-layer structure or a stacked structure as long as the thickness range described later can be realized. Moreover, in order to improve the adhesiveness with the adhesive layer 120 or the primer layer 130 on the surface of the support body 110, a known surface treatment (for example, chromic acid treatment, ozone exposure, ion radiation treatment, etc.) or a predetermined coating treatment is performed. Etc. may be given.

  In this embodiment, the support 110 has a thickness of 3 μm to 9 μm. When the thickness of the support 110 is less than 3 μm, not only the mechanical strength of the adhesive film 100 is insufficient, the reworkability during the pasting operation may be deteriorated, but the pasting operation becomes difficult and the workability is deteriorated. . On the other hand, when the thickness of the support 110 exceeds 9 μm, the total thickness of the pressure-sensitive adhesive film 100 becomes too large, so that the printing step becomes large or the thickness of the display device 1 becomes large. From the viewpoint of improving the reworkability of the pressure-sensitive adhesive film 100 and reducing the thickness of the printing step and the display device 1, the thickness of the support 110 is preferably 4 μm to 8 μm. In addition, the PET film having the thickness range as described above has not been substantially adopted as a support in an optical adhesive film.

[Adhesive layer 120]
The pressure-sensitive adhesive layer 120 is a layer made of an acrylic pressure-sensitive adhesive that is laminated on one surface of the support 110 and contains an acrylic polymer. In this way, the pressure-sensitive adhesive layer 120 is made of an acrylic pressure-sensitive adhesive, and as described later, even if the thickness of the pressure-sensitive adhesive layer 120 is as thin as 3 to 15 μm, the pressure-sensitive adhesive layer 120 and the glass 10 are moderate. Adhesive strength and moderate peel strength with the release film 140. Moreover, since it can have sufficient contact | adhesion power with the support body 110, the rework property of the adhesive film 100 does not fall.

  The acrylic pressure-sensitive adhesive uses an acrylic polymer as a pressure-sensitive adhesive component (base polymer) or a main agent. In addition to the base polymer, a cross-linking agent (for example, an isocyanate-based cross-linking agent, an epoxy-based cross-linking agent, a chelate type) is used as necessary. Crosslinking agents, etc.), tackifying resins (for example, rosin resins such as rosin and rosin esters, terpene resins, petroleum resins, styrene resins, phenol resins, etc.), softeners, plasticizers, fillers, anti-aging agents In addition, additives such as colorants may be included. The acrylic polymer contains a (meth) acrylic acid alkyl ester as a monomer component, and in addition to the (meth) acrylic acid alkyl ester, it can be copolymerized with the (meth) acrylic acid alkyl ester as necessary. A monomer (copolymerizable monomer) may be used. In addition, when a copolymerizable monomer is included, it is preferable that the (meth) acrylic acid alkyl ester is a main component contained in an amount of 50 mol% or more of the entire monomer component.

  Examples of the (meth) acrylic acid alkyl ester include, for example, methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, isopropyl (meth) acrylate, butyl (meth) acrylate, (meth) Isobutyl acrylate, s-butyl (meth) acrylate, t-butyl (meth) acrylate, pentyl (meth) acrylate, hexyl (meth) acrylate, heptyl (meth) acrylate, octyl (meth) acrylate, 2-Methylhexyl acrylate, isooctyl (meth) acrylate, nonyl (meth) acrylate, isononyl (meth) acrylate, decyl (meth) acrylate, isodecyl (meth) acrylate, undecyl (meth) acrylate , Dodecyl (meth) acrylate, tridecyl (meth) acrylate, (me ) Tetradecyl acrylate, pentadecyl (meth) acrylate, hexadecyl (meth) acrylate, heptadecyl (meth) acrylate, octadecyl (meth) acrylate, nonadecyl (meth) acrylate, eicosyl (meth) acrylate, etc. . Said (meth) acrylic-acid alkylester may be used independently, and may be used in combination of 2 or more type.

  Here, in this embodiment, it is preferable to use a (meth) acrylic acid alkyl ester having 3 to 20 carbon atoms (C3 to C20). Thereby, even if the thickness of the adhesive layer 120 is as thin as 3 to 15 μm, the adhesive force between the adhesive layer 120 and the glass 10 and the peel force between the release film 140 can be made more appropriate. Moreover, since the adhesive force with the support body 110 can be improved more, the rework property of the adhesive film 100 can be improved.

  Examples of the copolymerizable monomer include (meth) acrylic acid, itaconic acid, maleic acid, fumaric acid, crotonic acid, isocrotonic acid and other carboxyl group-containing monomers or anhydrides thereof; sulfonic acid such as sodium vinyl sulfonate; Group-containing monomers; aromatic vinyl compounds such as styrene and substituted styrene; cyano group-containing monomers such as acrylonitrile; olefins such as ethylene, propylene, and butadiene; vinyl esters such as vinyl acetate; vinyl chloride; acrylamide, methacrylamide, N -Amide group-containing monomers such as vinylpyrrolidone and N, N-dimethyl (meth) acrylamide; Hydroxyl group-containing monomers such as hydroxyalkyl (meth) acrylate and glycerin dimethacrylate; Aminoethyl (meth) acrylate, (meth) actyl Amino group-containing monomers such as loylmorpholine; imide group-containing monomers such as cyclohexylmaleimide and isopropylmaleimide; epoxy group-containing monomers such as glycidyl (meth) acrylate and methyl glycidyl (meth) acrylate; and 2-methacryloyloxyethyl isocyanate Isocyanate group-containing monomers, triethylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, ethylene glycol di (meth) acrylate, tetraethylene glycol di (meth) acrylate, neopentyl glycol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, trimethylolpropane tri (meth) acrylate, pentaerythritol tri (meth) acrylate, di Pentaerythritol hexa (meth) acrylate, a polyfunctional monomer such as divinylbenzene can be used. The said copolymerizable monomer may be used independently and may be used in combination of 2 or more type.

  The polymerization method of the acrylic polymer is not particularly limited, and a known polymerization method such as a solution polymerization method, an emulsion polymerization method, or an ultraviolet irradiation polymerization method can be used.

  The pressure-sensitive adhesive layer 120 may contain a colorant having the same color (same or similar color) as the colorant contained in the print layer 20. The similar color here refers to, for example, when the black colorant is used for the printing layer 20, and when the black colorant is included in the pressure-sensitive adhesive layer 120, the thickness of the printing layer 20. This means that a color of a similar color such as gray that can express a desired color even if the thickness is reduced is included. Therefore, since the pressure-sensitive adhesive layer 120 contains a colorant having the same color as that of the colorant contained in the printing layer 20, the thickness of the printing layer 20 itself can be reduced in addition to the thinning of the pressure-sensitive adhesive film 100. As a result, the printing step D can be further reduced.

  In this embodiment, the thickness of the pressure-sensitive adhesive layer 120 is 3 μm to 15 μm. By making the thickness of the pressure-sensitive adhesive layer 120 in the above range, the total thickness of the pressure-sensitive adhesive film 100 is reduced while the adhesive strength between the glass 10 is secured, and the thickness of the printing step or the display device 1 is reduced. Can do. In order to further increase the adhesive strength of the adhesive film 100 with the glass 10 and the adhesion with the support 110, the thickness of the adhesive layer 120 is preferably 7 μm or more. Moreover, in order to make the printing level difference and the thickness of the display device 1 smaller, it is preferable to set the thickness of the pressure-sensitive adhesive layer 120 to 12 μm or less. In addition, by setting the thickness of the pressure-sensitive adhesive layer 120 to 7 μm to 12 μm, it is possible to further improve the adhesion force with the glass 10 (in consideration of reworkability) and the peeling force with the peeling film 140. it can.

[Primer layer 130]
The primer layer 130 is a layer that can be laminated on the other surface of the support 110 (the surface opposite to the side on which the pressure-sensitive adhesive layer 120 is formed) to form a printing layer. The material for forming the primer layer 130 is not particularly limited, and examples thereof include polyester resins, urethane resins, acrylic resins, and ethylene-vinyl acetate copolymer resins (EVA: Ethylene-Vinyl). (Acetate) or the like can be used. However, the primer layer 130 is preferably made of a polyester resin. Thus, the primer layer 130 is made of a polyester resin, so that it adheres to the ultraviolet curable resin (for example, an acrylic ultraviolet curable resin used for UV mold or UV ink) that constitutes the printing layer 20 described above. It will be excellent. For example, a resin other than a polyester-based resin such as a urethane-based resin is inferior in adhesion to the ultraviolet curable resin constituting the printing layer 20. Moreover, since it can also have sufficient contact | adhesion power with the support body 110, the rework property of the adhesive film 100 does not fall.

  Although the thickness of the primer layer 130 is not particularly limited, it is sufficient that the total thickness of the pressure-sensitive adhesive film 100 can be 6 μm to 20 μm as described later. However, for economic reasons, the thickness of the primer layer 130 is preferably 5 μm or less, and more preferably 3 μm or less.

[Peeling film 140]
The release film 140 protects the adhesive surface of the adhesive layer 120 until the adhesive film 100 is used. The release film 140 is not particularly limited as long as it can realize a release force described later with the pressure-sensitive adhesive layer 120. Examples of the material of the release film 140 include resins such as polyethylene terephthalate (PET), polypropylene (PP), and polyethylene (PE), paper, foamed resin, metal, and the like. These materials can be used alone or 2 It can be used by laminating a film or foil of more than one kind of material. Among these, a resin film such as a PET film is preferable because of excellent surface smoothness.

  In addition, the release film 140 may be subjected to a known antistatic treatment such as a coating type, a kneading type, or a vapor deposition type, if necessary. Furthermore, you may apply | coat well-known mold release agents, such as a silicon type, a fluorine type, an alkyl type, or a fatty acid amide type, to the surface of the peeling film 140 as needed.

  Although the thickness of the peeling film 140 is not specifically limited, For example, it can be 20 micrometers-200 micrometers. The thickness of the release film 140 may be appropriately determined in consideration of workability, the peel force between the pressure-sensitive adhesive layer 120, and the like.

[Protective film 150]
The protective film 150 protects the surface of the primer layer 130 until the pressure-sensitive adhesive film 100 is used (for example, the surface of the primer layer 130 is not damaged when the roll-shaped pressure-sensitive adhesive film 100 is processed into a flat plate shape or the like). To do. The protective film 150 is not particularly limited as long as the adhesiveness with the primer layer 130 is appropriate (having adhesiveness that does not damage the surface of the primer layer 130 when the protective film 150 is peeled off). . As a material of the protective film 150, for example, the same material as that of the release film 140 can be used. Further, the thickness of the protective film 150 may be appropriately determined in consideration of workability, adhesion between the primer layer 130 and the like.

[Total thickness of support 110, adhesive layer 120, and primer layer 130]
In this embodiment, the total thickness of the pressure-sensitive adhesive film 100 (excluding the release film 140 and the protective film 150), that is, the total thickness of the support 110, the pressure-sensitive adhesive layer 120, and the primer layer 130 is 6 μm to 20 μm. By setting the total thickness to 6 μm or more, the mechanical strength of the adhesive film 100 and the adhesive strength with the glass 10 can be made sufficient. On the other hand, by setting the total thickness to 20 μm or less, the printing step and the thickness of the display device 1 can be reduced. In order to express the above effect more effectively, that is, the total thickness of the support 110, the pressure-sensitive adhesive layer 120, and the primer layer 130 is preferably 8 μm to 16 μm, and more preferably 10 μm to 15 μm. preferable.

[Ratio of the thickness of the support 110 and the pressure-sensitive adhesive layer 120]
Moreover, it is preferable that ratio of the thickness of the support body 110 and the thickness of the adhesive layer 120 is 100: 65-100: 400, and it is more preferable that it is 100: 110-100: 350. By setting it as such a thickness ratio, even if it reduces the thickness of the adhesive layer 120, while being able to raise the adhesive force mentioned later more, the adhesiveness between the support body 110 and the adhesive layer 120 is improved. be able to. In addition, the said thickness ratio is completely different from the thickness ratio of the support body and adhesive layer in the adhesive film of the conventional optical system.

[Adhesive force]
The pressure-sensitive adhesive layer 120 is attached to smooth stainless steel (SUS304) with a load of 2 kg, and the adhesive strength when peeled 180 ° at 300 mm / min after standing for 1 hour is preferably 6N to 16N / 25 mm, and 8N to 14N. / 25 mm is more preferable. The adhesive force between the adhesive film 100 and the glass 10 becomes suitable because the adhesive layer 120 has an adhesive force in the above range. More specifically, the adhesive strength of the pressure-sensitive adhesive layer 120 is 6 N / 25 mm (more preferably 8 N / 25 mm) or more, thereby ensuring a strong adhesive strength that can prevent the adhesive film 100 from being peeled from the glass 10. On the other hand, when the adhesive force of the adhesive layer 120 is 16 N / 25 mm (more preferably 14 N / 25 mm) or less, the reworkability can be improved.

  In addition, although the measurement of the said adhesive force is explained in full detail in the Example mentioned later, it can perform according to the test method of 180 degree | times peeling adhesive force of JIS-Z0237 (2000).

[Peeling force]
The 180 ° peeling force between the pressure-sensitive adhesive layer 120 and the release film 140 at 300 mm / min is preferably 20 mN to 500 mN / 25 mm, and more preferably 40 mN to 400 mN. There exists a possibility that a float may appear between the adhesive layer 120 and the peeling film 140 as the said peeling force is less than 20 mN / 25mm. On the other hand, if the peeling force exceeds 500 mN / 25 mm, the peeling film 140 may be wrinkled when the peeling film 140 is peeled from the pressure-sensitive adhesive layer 120.

  The measurement value of the peeling force will be described in detail in the examples described later. After sticking the adhesive film 100 to a stainless steel piece and leaving it for a predetermined time, it is peeled off at a rate of 300 mm / min using a Tensilon universal tensile tester. The measured value when the film 140 is pulled and peeled off 180 degrees and the peel force is measured is used.

<Method for producing adhesive film 100>
The configuration of the pressure-sensitive adhesive film 100 according to this embodiment has been described above. Subsequently, a method for manufacturing the pressure-sensitive adhesive film 100 having such a configuration will be described.

  It does not restrict | limit especially as a manufacturing method of the adhesive film 100 which concerns on this form, It can select suitably from a well-known manufacturing method. For example, after forming the pressure-sensitive adhesive layer 120 by applying and curing the acrylic pressure-sensitive adhesive described above on one surface of the support 110, or together with forming the pressure-sensitive adhesive layer 120, the other surface of the support 110. The pressure-sensitive adhesive film 100 can be obtained by applying or laminating the above-described polyester resin to form the primer layer 130. Furthermore, if necessary, the release film 140 may be attached to the surface of the pressure-sensitive adhesive layer 120 and the protective film 150 may be attached to the surface of the primer layer 130.

Moreover, you may employ | adopt the manufacturing method provided with the following process (A)-(C) as a manufacturing method of the adhesion film 100. FIG.
Step (A): A step of applying an acrylic pressure-sensitive adhesive to the release-treated surface of the release film 140 and forming an adhesive layer 120 on the release film 140 Step (B): A release film on one surface of the support 110 Step of bonding the pressure-sensitive adhesive layer 120 formed on 140 and forming the pressure-sensitive adhesive layer 120 on the support 110 Step (C): Applying or laminating a polyester resin on the other surface of the support 110, Step of forming primer layer 130

  In addition, when the adhesive layer 120 formed on the peeling film 140 is bonded to one surface of the support 110 to form the adhesive layer 120 on the support 110, the tension applied to the support 110 is applied. By adjusting the thickness to be as low as possible, the pressure-sensitive adhesive film 100 can be manufactured in a good state without causing wrinkles or the like even if the support 110 is very thin.

<Use of adhesive film 100>
The adhesive film 100 according to this embodiment includes a smartphone, a mobile phone, a tablet PC (Personal Computer), a laptop PC, a digital still camera, a digital video camera, a portable GPS (Global Positioning System), a portable music player, and a portable DVD. An outer frame 20a, a logo 20b, an icon on the surface of a transparent member such as a glass used in an electronic device (display device) having a display such as a player, an electronic dictionary, a PDA (Personal Digital Assistant), a television receiver, or a desktop PC. It is suitably used as an adhesive film for print formation when printing 20c or the like.

<< Second Embodiment >>
Secondly, the pressure-sensitive adhesive film for forming a printed layer according to the second embodiment of the present invention will be described. The pressure-sensitive adhesive film for forming a printed layer according to the present embodiment is a pressure-sensitive adhesive film in which a frame-like (frame-like) printed layer is formed in a state of being attached to a transparent member such as glass. The frame-shaped printing portion is formed and a transparent non-printing portion in which a printing layer (enclosed by the frame-shaped printing portion) inside the frame-shaped printing portion is not formed. Hereinafter, the configuration, the manufacturing method, and the application of the pressure-sensitive adhesive film for forming a printed layer according to the present embodiment will be described in the order.

<Configuration of adhesive film 200>
First, the structure of the pressure-sensitive adhesive film 200 for forming a printed layer according to the present embodiment (hereinafter sometimes simply referred to as “pressure-sensitive adhesive film 200”) will be described with reference to FIGS. FIG. 5 is a plan view showing the overall configuration of the adhesive film 200 according to this embodiment. 6 is a cross-sectional view of the adhesive film 200 shown in FIG. 5 taken along line VI-VI. FIG. 7 is a cross-sectional view showing a state in which a printed layer is formed on the adhesive film 200 attached to glass. FIG. 8 is a cross-sectional view of the adhesive film 200 attached to the glass shown in FIG. 7 taken along line VIII-VIII. In FIG. 7, the reference numeral “20 (201)” indicates that the printing layer 20 is laminated on the printing unit 201. The reference numeral “203 (10)” indicates that the non-printing portion 203 is laminated on the glass 10.

[overall structure]
As shown in FIG. 5, the adhesive film 200 according to this embodiment includes a printing unit 201 and a non-printing unit 203. The printing unit 201 has a frame shape and is a portion (area) where a printing layer 20 described later is formed. The non-printing unit 203 is a frame-shaped printing unit inside the frame-shaped printing unit 201. A transparent portion (a transparent region inside the frame) surrounded by 201. Since the non-printing part 203 is located in the part which overlaps the display of the display apparatus 2, it is formed with a transparent material so that light can permeate | transmit. On the other hand, the printing unit 201 transmits light so as to shield the periphery of the display in order to prevent the illumination light emitted from the display panel (for example, the backlight of the liquid crystal panel) from leaking from the periphery of the display panel. Or made of a material having low light transmittance. The same applies to the material of the printing unit 201 in the first embodiment described above.

  As shown in FIG. 6, the printing unit 201 includes a support 210, an adhesive layer 220 laminated on one surface of the support 210, and the other surface of the support 210 (adhesive layer 220 and It has a five-layer structure consisting of a primer layer 230 laminated on the opposite surface), a release film 240 laminated on the surface of the pressure-sensitive adhesive layer 220, and a protective film 250 laminated on the surface of the primer layer 230. doing. In the example illustrated in FIG. 6, the non-printing unit 203 also has the support 210, the adhesive layer 220 laminated on one surface of the support 210, and the other surface of the support 210, as with the printing unit 201. From the primer layer 230 laminated on the surface opposite to the pressure-sensitive adhesive layer 220, the release film 240 laminated on the surface of the pressure-sensitive adhesive layer 220, and the protective film 250 laminated on the surface of the primer layer 230. The five-layer structure is as follows.

  Here, in the example shown in FIG. 6, the non-printing portion 203 is also provided with the pressure-sensitive adhesive layer 220, the primer layer 230, the release film 240, and the protective film 250. Is not limited. For example, the non-printing part 203 may not be provided with the pressure-sensitive adhesive layer 220, the primer layer 230, the release film 240 and the protective film 250, but only the support 210 may be provided, or the primer layer 230 and the protective film 250 may be provided. You may make it provide only the support body 210, the adhesive layer 220, and the peeling film 240, without providing. For example, when the primer layer 230 is not provided in the non-printing portion 203, the problem of the printing step as in the first embodiment occurs. However, the material provided for the non-printing portion 203 (for forming the primer layer 230 and the protective film 250) Material). On the other hand, for example, as shown in FIG. 6, when all the above five layers are also provided in the non-printing portion 203, it is easy to process the constituent materials of each layer (there is no need to provide openings, and a simple sheet can be used. Therefore, not only can the manufacturing efficiency of the pressure-sensitive adhesive film 200 be improved, but also the problem of printing steps is unlikely to occur. Furthermore, since the thickness of the non-printing part 203 of the adhesive film 200 is increased, the strength is increased and the film is more suitable for applications such as a scattering prevention film.

  Although details of each layer will be described later, after the release film 240 is peeled from the pressure-sensitive adhesive layer 220, the pressure-sensitive adhesive layer 220 is pressed against the surface of the glass 10 of the display device, whereby the pressure-sensitive adhesive layer 220 has an adhesive force. The adhesive film 200 is affixed to the glass 10. Next, the protective film 250 is peeled from the primer layer 230 in a state where the adhesive film 200 is adhered to the glass 10, and the printing layer 20 is formed on the surface of the primer layer 230.

  The state in which the printing layer 20 is formed as described above is shown in FIGS. As shown in FIG. 7, the printing layer 20 is formed on the surface of the primer layer 230 of the printing unit 201 and has a frame shape. Note that the printing layer 20 may be formed so as to cover the entire printing unit 201, or the printing layer 20 may be formed so as to cover a part of the printing unit 201 as illustrated in FIG. 7. Good. A specific example of the print layer 20 is the same as in the first embodiment.

  In addition, about the structure of the glass 10 and the printing layer 20, since it is the same as that of 1st Embodiment mentioned above, detailed description is abbreviate | omitted here.

  Here, as shown in FIG. 8, when the thickness of the adhesive film 200 is thick, the thickness of the display device 2 as a whole increases accordingly. Therefore, in this embodiment, the total thickness of the pressure-sensitive adhesive film 200 in a state where the printing layer 20 is formed, excluding the release film 240 and the protective film 250 described later, that is, the support 210, the pressure-sensitive adhesive layer 220, and the primer described later. By reducing the total thickness of the layer 230, the total thickness of the adhesive film 100 is reduced. In order to reduce the total thickness of the pressure-sensitive adhesive film 200, in this embodiment, the thickness of the support 210 and the thickness of the pressure-sensitive adhesive layer 220 which are not conventionally used are realized (not support-less). Hereinafter, the configuration of each layer of the pressure-sensitive adhesive film 200 according to this embodiment will be described in detail.

[Support 210]
The support 210 is the same as the support 110 according to the first embodiment except that the opening is not formed in the printing unit 201 and has a simple film (sheet) shape.

[Adhesive layer 220, primer layer 230, release film 240, protective film 250]
When the pressure-sensitive adhesive layer 220, the primer layer 230, the release film 240, and the protective film 250 are not provided in the non-printing portion 203, they are the same as those in the first embodiment described above, and are provided in the non-printing portion 203. In the first embodiment, except that an opening is not formed inside the printing unit 201, it is in a simple film (sheet) shape, and needs to be transparent. This is the same as the pressure-sensitive adhesive layer 120, the primer layer 130, the release film 140, and the protective film 150.

[Total thickness of support 210, adhesive layer 220, and primer layer 230]
The total thickness of the pressure-sensitive adhesive film 200 (excluding the release film 240 and the protective film 250), that is, the total thickness of the support 210, the pressure-sensitive adhesive layer 220, and the primer layer 230 is 6 μm to 20 μm, as in the first embodiment. It is preferably 8 μm to 16 μm, more preferably 10 μm to 15 μm.

[Ratio of the thickness of the support 210 and the pressure-sensitive adhesive layer 220]
Further, the ratio between the thickness of the support 210 and the thickness of the pressure-sensitive adhesive layer 220 is preferably 100: 65 to 100: 400, and preferably 100: 10 to 100: 350, as in the first embodiment. More preferred.

[Adhesive strength / peeling strength]
Furthermore, it is preferable that the pressure range of the pressure-sensitive adhesive layer 220 and the peeling force between the pressure-sensitive adhesive layer 220 and the release film 240 also satisfy the same numerical range as in the first embodiment described above. However, when considering the use as a scattering prevention film, the upper limit value of the adhesive strength is more preferably 12 N / 25 mm or more.

[Haze]
In this embodiment, since the support 210 has the non-printing portion 203 and the non-printing portion 203 is provided at a position corresponding to the display, the presence of the support 210 prevents the display visibility from being lowered. Is preferred. From such a viewpoint, it is preferable that the non-printing portion 203 (in this embodiment, for example, a laminate of the support 210, the pressure-sensitive adhesive layer 220, and the primer layer 230) has a haze of 0.5 to 3.5, More preferably, it is 0.5-2.0.

  Here, the haze in the present embodiment can be obtained by a method according to JIS K 7136.

<Method for producing adhesive film 200>
Since the manufacturing method of the adhesive film 200 which concerns on this form is the same as that of the adhesive film 100 which concerns on 1st Embodiment mentioned above, the detailed description is abbreviate | omitted.

<Use of adhesive film 200>
The adhesive film 200 according to the present embodiment is used in the same manner as the adhesive film 100 according to the first embodiment described above, as well as a smartphone, a mobile phone, a tablet PC (Personal Computer), a laptop PC, a digital still camera, and a digital video camera. , Portable GPS (Global Positioning System), portable music player, portable DVD player, electronic dictionary, PDA (Personal Digital Assistant), television receiver, desktop PC, etc. When a transparent member such as glass is damaged, it is also suitably used as a scattering prevention film for preventing scattering of the transparent member such as glass.

  Next, although an example and a comparative example explain the present invention still more concretely, the present invention is not limited at all by these examples.

<Production of adhesive film>
First, the production methods of the adhesive films of Examples 1 to 8 and Comparative Example 1 will be described.

[Example 1]
Acrylic adhesive (Olivein BPS6080TFK (manufactured by Toyochem Co., Ltd.): Olivine BPS8515 (manufactured by Toyochem Co., Ltd.) = 100: 2.5) in a mass ratio was prepared, and a release PET (3811 made by Lintec Co., Ltd.) having a thickness of 38 μm was prepared. The pressure-sensitive adhesive layer was formed by coating and drying so that the dry film thickness was 10 μm, and a 4 μm-thick polyester film (Lumirror 4AF53 manufactured by Toray Industries, Inc.) was attached as a support (PET film). A primer layer (mixed with Toyo Morton AD76R67: CAT-10L = 100: 5.8 (mass ratio)) having a polyester resin as a main component on the support surface of the adhesive film has a dry film thickness of 1. A pressure-sensitive adhesive film with a primer layer was prepared by applying and drying to a thickness of 0 μm.

[Example 2]
A pressure-sensitive adhesive film of Example 2 was produced in the same manner as in Example 1 except that the thickness of the support (PET film) was 6 μm (Lumirror 6CF53 manufactured by Toray Industries, Inc.) and the thickness of the pressure-sensitive adhesive layer was 3 μm.

[Example 3]
An adhesive film of Example 3 was produced in the same manner as Example 2 except that the thickness of the adhesive layer was 4 μm.

[Example 4]
A pressure-sensitive adhesive film of Example 4 was produced in the same manner as in Example 1 except that a black colorant (NX-595 Black manufactured by Dainichi Seika Co., Ltd.) was added to the pressure-sensitive adhesive layer. In addition, only the present Example 4 produced the adhesive film of the frame shape (form corresponding to 1st Embodiment mentioned above).

[Example 5]
An adhesive film of Example 5 was produced in the same manner as in Example 1 except that the thickness of the adhesive layer was 5 μm.

[Example 6]
An adhesive film of Example 6 was produced in the same manner as in Example 1 except that the thickness of the adhesive layer was 15 μm.

[Example 7]
A pressure-sensitive adhesive film of Example 7 was produced in the same manner as Example 1 except that the thickness of the support was 3 μm and the thickness of the pressure-sensitive adhesive layer was 13.5 μm.

[Example 8]
An adhesive film of Example 8 was produced in the same manner as Example 1 except that the main component of the primer layer was urethane.

[Comparative Example 1]
A pressure-sensitive adhesive film of Comparative Example 1 was produced in the same manner as in Example 1 except that the support was not provided and the thickness of the pressure-sensitive adhesive layer was 14 μm.

<Evaluation method>
Next, adhesive force measurement, peel force measurement, evaluation of adhesion between the UV curable resin and the primer layer, evaluation of appropriate level difference, and evaluation of appropriateness of the scattering prevention film performed for Examples 1 to 8 and Comparative Example 1. A method for evaluating workability such as reworkability will be described.

(Adhesive strength measurement)
The adhesive strength was measured as follows according to the test method of 180 degree peeling adhesive strength of JIS-Z0237 (2000). That is, the adhesive films of Examples and Comparative Examples having a width of 25 mm were attached to the adherend by one reciprocating pressure application to the adherend with a 2 kg roller under the conditions of an environmental temperature of 23 ° C. and a humidity of 50%, and left for 1 hour. Using a Tensilon universal tensile tester (Orientec, RTA100), the film was pulled at a speed of 300 mm / min under the same temperature and humidity conditions, and then peeled off 180 degrees to measure the adhesive force S. Stainless steel (SUS304) was used as the adherend. The adhesive strength was evaluated according to the following criteria.
A: Adhesive strength is 8 N / 25 mm or more and 14 N / 25 mm or less B: Adhesive strength is 6 N / 25 mm or more and less than 8 N / 25 mm, or more than 14 N / 25 mm and 16 N / 25 mm or less Δ: Adhesive strength is less than 6 N / 25 mm or 16 N / Over 25mm

(Peeling force measurement)
The peeling force was measured as follows. In other words, the adhesive tapes of Examples and Comparative Examples having a width of 25 mm were attached to the adherend by one reciprocating pressure application to a stainless steel piece with a 2 kg roller using # 8612DFT manufactured by DIC under conditions of an environmental temperature of 23 ° C. and a humidity of 50%. After leaving for 1 hour, using a Tensilon universal tensile tester (Orientec, RTA100), the release sheet was pulled at a rate of 300 mm / min under the same temperature and humidity conditions, and the peel strength was measured by peeling 180 degrees.

(Haze measurement)
All the haze of the non-printing part of the adhesive film of Examples 1-3 and 5-8 produced above was measured. The total haze was measured according to JIS K 7136. As a result, the total haze of Example 1 was 1.62 (%). Also about Examples 2-3 and 5-8, it had the same total haze as Example 1.

(Evaluation of adhesion between UV curable resin and primer layer)
A mold layer and a colored layer were applied as a printing layer to the primer layer of the pressure-sensitive adhesive film prepared above, and a cross-cut test (1) was performed after curing. FD237 Riotone (made by Toyo Ink), which is a UV mold ink, is used as a paint for forming a mold layer, and FD0L black (made by Toyo Ink), which is a UV printing ink, is used as a paint for forming a colored layer. did. As a result, since the evaluation results of the crosscut test (1) were all good (in accordance with the following evaluation criteria), a heat treatment was performed in which the adhesive film provided with the UV mold layer was immersed in hot water at 100 ° C. for 20 minutes. Later, the cross-cut test (2) was performed again. The results are shown in Table 1. In addition, the crosscut test was done according to JIS K5600-5-6 (crosscut method). The evaluation criteria are as follows.
(Double-circle): The edge of a cut is completely smooth, there is no peeling in the eyes of any lattice, or there is a small peeling of the UV mold layer at the intersection of the cuts. It is clearly not more than 5% that the crosscut is affected.
○: The UV mold layer is peeled along the edge of the cut and / or at the intersection. The cross-cut part is clearly affected by more than 5% but not more than 15%.
Δ: The UV mold layer is partially or completely peeled along the edge of the cut, and / or various parts of the eyes are partially or completely peeled off. The cross-cut portion is clearly affected by more than 15% but not more than 35%.
X: The UV mold layer is partially or completely peeled along the edge of the cut, and / or several eyes are partially or completely peeled off. The cross-cut portion is clearly not affected by more than 35%

(Evaluation of appropriate level difference)
From the total thickness of the pressure-sensitive adhesive film produced above (excluding the thickness of the release film and the protective film), the suitability as a printing layer forming film was evaluated according to the following criteria.
A: Total thickness is 15 μm or less ○: Total thickness is more than 15 μm and 16 μm or less Δ: Total thickness is more than 16 μm and 20 μm or less ×: Total thickness is more than 20 μm

(Evaluation of scattering prevention film characteristics)
From the measured value of the adhesive strength of the adhesive film measured above, the suitability as a scattering prevention film was evaluated according to the following criteria.
A: Adhesive strength is 12 N / 25 mm or more O: Adhesive strength is 8 N / 25 mm or more and less than 12 N / 25 mm Δ: Adhesive strength is 6 N / 25 mm or more and less than 8 N / 25 mm X: Adhesive strength is less than 6 N / 25 mm

(Processability evaluation)
The adhesive film produced above was bonded to Gorilla Glass (registered trademark), and the workability (reworkability, etc.) was evaluated according to the following criteria based on the ease of peeling when peeled off after 1 hour.
(Double-circle): There was no wrinkle and adhesive residue and it was able to peel off easily without feeling resistance.
○: Resistance was felt when peeling, but there was no wrinkle or adhesive residue.
X: Wrinkles and adhesive residue were generated.

(Comprehensive evaluation)
Based on the results of the above tests and evaluations, comprehensive evaluation was performed based on the following criteria.
A: Adhesive strength measurement, evaluation of adhesion between UV curable resin and primer layer, evaluation of appropriate level difference, evaluation of scattering prevention film characteristics, and evaluation of processability are all “◎”, and “○”, “Δ” and “x” are not.
○: There is at least one item among the items of adhesive strength measurement, adhesion evaluation between UV curable resin and primer layer, evaluation of appropriate level difference, evaluation of scattering prevention film characteristics, and evaluation of workability. However, there is no Δ or x.
Δ: At least one of the items of adhesive strength measurement, evaluation of adhesion between UV curable resin and primer layer, evaluation of appropriate level difference, evaluation of scattering prevention film characteristics, and evaluation of workability has Δ But there is no x.
X: At least one or more items among the items of adhesive strength measurement, adhesion evaluation between UV curable resin and primer layer, evaluation of appropriate level difference, evaluation of scattering prevention film characteristics, and evaluation of workability .

<Evaluation results>
As shown in Table 1, the adhesive films of Examples 1 to 8 gave good results for any evaluation. In particular, the adhesive strength of Examples 3 and 6 in which the thickness ratio of the support: pressure-sensitive adhesive layer is 100: 65 to 100: 400 is more preferable (◯), and further, the thickness ratio of the support: pressure-sensitive adhesive layer. The adhesive strengths of Examples 1, 4, 5 and 8 in which No. is 100: 110 to 100: 350 were more preferable (◎). Moreover, Examples 1-7 which used the polyester-type resin as a primer layer were excellent in adhesiveness of UV curable resin (UV mold layer) and a primer layer.

  On the other hand, in the comparative example 1 which does not have a support body, although the thickness of the adhesive layer was thicker than Examples 1-5 and Examples 7 and 8, adhesive force was low. Moreover, since the comparative example 1 did not have a support body, workability and workability | operativity were also very bad.

  The preferred embodiment of the present invention has been described above with reference to the drawings, but the present invention is not limited to the above-described embodiment. That is, it is understood that other forms or various modifications that can be conceived by those skilled in the art within the scope of the invention described in the claims belong to the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 1, 2 Display apparatus 10 Glass 20 Printing layer 100, 200 Adhesive film 101, 201 Printing part 103 Opening part 203 Non-printing part 110, 210 Support body 120, 220 Adhesive layer 130, 230 Primer layer 140, 240 Release film 150, 250 protective film

Claims (12)

A pressure-sensitive adhesive film for forming a printing layer capable of forming a frame-shaped printing layer,
A support;
A pressure-sensitive adhesive layer made of an acrylic pressure-sensitive adhesive laminated on one surface of the support and containing an acrylic polymer;
A primer layer laminated on the other surface of the support and capable of forming the print layer;
With
The support has a thickness of 3 to 9 μm,
The pressure-sensitive adhesive layer has a thickness of 3 to 15 μm,
The pressure-sensitive adhesive film for forming a printing layer, wherein a total thickness of the support, the pressure-sensitive adhesive layer, and the primer layer is 6 μm to 20 μm.   The pressure-sensitive adhesive film for forming a print layer according to claim 1, wherein the pressure-sensitive adhesive film comprises a frame-shaped print portion on which the print layer is formed and an opening surrounded by the print portion.   2. The printing according to claim 1, wherein the adhesive film is composed of a frame-shaped printing part in which the printing layer is formed and a transparent non-printing part in which the printing layer inside the frame-shaped printing part is not formed. Layer-forming adhesive film.   The pressure-sensitive adhesive film for forming a printed layer according to claim 3, wherein the total haze of the non-printing part is 0.5 to 3.5.   The pressure-sensitive adhesive film for forming a printing layer according to any one of claims 1 to 4, wherein the support is made of a polyethylene terephthalate film.   The pressure-sensitive adhesive film for printing layer formation according to any one of claims 1 to 5, wherein the acrylic polymer is a polymer containing a C3 to C20 (meth) acrylic acid alkyl ester as a monomer component.   The pressure-sensitive adhesive film for forming a print layer according to any one of claims 1 to 6, wherein the pressure-sensitive adhesive layer contains a colorant having the same color as the print layer.   The pressure-sensitive adhesive film for printing layer formation according to any one of claims 1 to 7, wherein the primer layer is made of a polyester-based resin.   The pressure-sensitive adhesive film for printing layer formation according to any one of claims 1 to 8, wherein a ratio of the thickness of the support to the thickness of the pressure-sensitive adhesive layer is 100: 65 to 100: 400.   The pressure-sensitive adhesive layer is attached to smooth stainless steel (SUS304) with a load of 2 kg, and the adhesive strength of peeling at 180 ° at 300 mm / min after standing for 1 hour is 6 N to 16 N / 25 mm. The pressure-sensitive adhesive film for forming a printed layer according to any one of the above. Having a release film on the surface of the pressure-sensitive adhesive layer opposite to the surface in contact with the support,
The pressure-sensitive adhesive film for forming a printing layer according to any one of claims 1 to 10, wherein a 180 ° peeling force at 300 mm / min between the pressure-sensitive adhesive layer and the release film is 20 to 500 mN / 25 mm. The pressure-sensitive adhesive film for forming a printed layer according to any one of claims 1 to 11,
A printing layer formed on the primer layer side of the pressure-sensitive adhesive film for forming the printing layer;
A transparent member affixed to the adhesive layer of the adhesive film;
A display device comprising:

Images