JP2011093977A - Adhesive sheet with decorative printing layer, manufacturing method therefor, and portable terminal appliance - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an adhesive sheet with a decorative printing layer capable of improving the yield in a process, reducing the number of processes, simplifying production equipment, achieving flatness of the information display part surface of a portable terminal appliance at a production site of a portable terminal appliance, its manufacturing method, and a portable terminal appliance. <P>SOLUTION: The adhesive sheet with a decorative printing layer 1 comprises a substrate film 3 with a hard coat layer 2 provided on at least one surface 3a side, a decorative printing layer 4 provided partially on the other surface 3b of the substrate film 3, and an adhesive layer 5 laminated in this order. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a pressure-sensitive adhesive sheet with a decorative print layer used as a surface protective sheet for a mobile terminal device such as a mobile phone or a mobile device, a method for manufacturing the same, and a mobile terminal device using the same.

  In recent years, mobile terminal devices are required to be thinner and lighter. Conventionally, the surface of an information display unit of a portable terminal device has covered a peripheral portion with a bezel cover or the like in order to conceal an electric circuit or the like inside the device (see, for example, Patent Document 1).

  However, recent portable terminal devices have adopted a configuration that takes advantage of their design. Due to the reduction in thickness and the increase in the amount of information, and the increase in the amount of information, especially the spread of touch panels, a design with a flat surface that does not have a bezel cover has come to be preferred.

Such miniaturization of the portable terminal device brings the light source and the display panel closer to each other, so that light from the light source easily leaks to the outside through an adhesive layer sandwiched between the light source and the panel. In particular, when light leaks from the edge of the image, the display surface of the panel becomes difficult to see.
For this reason, applying a decorative printing layer to an internal structural member is performed. Decorative printing is printing that is generally performed to provide concealment and design properties, but especially when used as an internal component of a mobile terminal device, the decorative printing layer not only has design properties but also the interior of the device. It is required to conceal an electric circuit and have light shielding properties against leaking light.

  In order to solve the above problems, a double-sided pressure-sensitive adhesive tape excellent in light shielding properties has been proposed (see, for example, Patent Document 2).

JP 2006-106417 A JP 2008-274163 A

  However, since the double-sided pressure-sensitive adhesive tape according to Patent Document 2 is punched into a frame shape, it is necessary to superimpose the pressure-sensitive adhesive layer and the decorative print layer in the thickness direction. There is room for improvement in terms of reducing the weight of equipment.

  In addition, in order to apply the decorative printing layer, a constituent member of the printed sheet is required, and a printing process is required. In addition, in order to fill the air gap with adhesive and reduce the film thickness, follow the step on the adhesive layer so as to follow the minute step generated at the boundary between the part with decorative printing and the part without decoration printing. It is necessary to give performance. Usually, autoclave processing is performed to follow the steps, and the number of processes is further increased, and a large-scale manufacturing facility is required. In addition, there is a problem that air bubbles are mixed depending on the storage elastic modulus of the pressure-sensitive adhesive layer, which may deteriorate the yield.

  The present invention has been made in view of the above circumstances, and at the manufacturing site of portable terminal equipment, yield improvement in the process, reduction in the number of processes, simplification of manufacturing equipment, the surface of the information display portion of the mobile terminal equipment An object is to provide a pressure-sensitive adhesive sheet with a decorative print layer, a method for producing the same, and a mobile terminal device that can cope with flattening and the like.

  The pressure-sensitive adhesive sheet with a decorative printing layer of the present invention is a base film provided with a hard coat layer on at least one side, and a decoration partially provided on the other side of the base film. The print layer and the pressure-sensitive adhesive layer are laminated in this order.

  In the pressure-sensitive adhesive sheet with a decorative print layer of the present invention, it is preferable that a decorative print layer is partially provided on the other surface side of the base film via a hard coat layer.

  In the pressure-sensitive adhesive sheet with a decorative print layer of the present invention, the base film, the decorative print layer, the pressure-sensitive adhesive layer, and the release sheet are preferably laminated in this order.

  In the pressure-sensitive adhesive sheet with a decorative print layer of the present invention, it is preferable that the hard coat layer, the base film, and the pressure-sensitive adhesive layer are punched out in accordance with the shape of the adherend leaving a release sheet.

  In the pressure-sensitive adhesive sheet with a decorative print layer of the present invention, the base film is preferably a polyethylene terephthalate film or a polycarbonate film.

  The pressure-sensitive adhesive sheet with a decorative print layer of the present invention preferably has a storage elastic modulus at 23 ° C. of the pressure-sensitive adhesive layer of 0.01 to 0.3 MPa.

  The pressure-sensitive adhesive sheet with a decorative print layer of the present invention is preferably used as a surface protective sheet for a mobile terminal device.

  In the method for producing a pressure-sensitive adhesive sheet with a decorative printing layer of the present invention, a decorative printing layer is partially applied to one surface of the base film, and the base material on which the pressure-sensitive adhesive layer and the release sheet are laminated. It is characterized by laminating a base film, a decorative printing layer, a pressure-sensitive adhesive layer, and a release sheet in this order by laminating the pressure-sensitive adhesive surface of the less pressure-sensitive adhesive sheet with the surface having the decorative printing layer of the base film. To do.

  The portable terminal device of the present invention is characterized in that it has partial light shielding properties by the pressure-sensitive adhesive sheet with a decorative print layer.

  According to the pressure-sensitive adhesive sheet with a decorative printing layer of the present invention, at the manufacturing site of the mobile terminal device, the yield in the process is improved, the number of processes is reduced, the manufacturing equipment is simplified, and the surface of the information display unit of the mobile terminal device is flattened. Etc.

  According to the method for producing a pressure-sensitive adhesive sheet with a decorative printing layer of the present invention, a thinned pressure-sensitive adhesive sheet with a decorative printing layer is obtained.

  According to the portable terminal device of the present invention, it is possible to cope with improvement in process yield, reduction in the number of steps, simplification of manufacturing equipment, flattening of the surface of the information display unit of the portable terminal device, etc. at the manufacturing site. In addition, the portable terminal device can be made lighter and thinner.

It is a schematic sectional drawing which shows 1st embodiment of the adhesive sheet with a decorative print layer of this invention. It is a schematic sectional drawing which shows 2nd embodiment of the adhesive sheet with a decorative print layer of this invention. It is a schematic plan view which shows 2nd embodiment of the adhesive sheet with a decorative print layer of this invention. It is a schematic sectional drawing which shows what was punch-processed in 2nd embodiment of the adhesive sheet with a decorative print layer of this invention. It is a schematic plan view which shows what was punch-processed in 2nd embodiment of the adhesive sheet with a decorative print layer of this invention. It is a schematic sectional drawing which shows 3rd embodiment of the adhesive sheet with a decorative print layer of this invention. It is a schematic sectional drawing which shows what was punch-processed in 3rd embodiment of the adhesive sheet with a decorative print layer of this invention.

The embodiment of the pressure-sensitive adhesive sheet with a decorative print layer of the present invention will be described.
This embodiment is specifically described for better understanding of the gist of the invention, and does not limit the present invention unless otherwise specified.

(1) 1st embodiment FIG. 1: is a schematic sectional drawing which shows 1st embodiment of the adhesive sheet with a decorating printing layer of this invention. The pressure-sensitive adhesive sheet with a decorative print layer 1 of this embodiment is partially a base film 3 coated with a hard coat layer 2 on one side 3a and a side 3b of the base film 3 on the other side. The decorative print layer 4 and the pressure-sensitive adhesive layer 5 provided in the are laminated in this order. Although FIG. 1 shows a print pattern having a frame shape, the pressure-sensitive adhesive sheet with a decorative print layer of the present invention is not limited thereto, and may be, for example, a print pattern having design properties.
The decorative printed layer-attached pressure-sensitive adhesive sheet 1 is applied to a surface protective sheet of a mobile terminal device such as a mobile phone or a mobile device.

  As the base film 3, various plastic sheets and films can be used. Specific examples of the base film include, for example, polyolefin resins such as polyethylene resins and polypropylene resins, polyester resins such as polyethylene terephthalate resins, polyethylene naphthalate resins, and polybutylene terephthalate resins, polyvinyl chloride resins, polystyrene resins, polyurethane resins, and polycarbonates. Examples thereof include films of various synthetic resins such as resin, polyamide resin, polyimide resin, and fluorine resin, and polyethylene terephthalate resin or polycarbonate resin that can impart a scattering prevention effect is particularly preferable.

  The thickness of the base film 3 is preferably 50 μm to 300 μm, more preferably 60 μm to 250 μm, and particularly preferably 70 μm to 200 μm.

  In the first embodiment of the present invention, the hard coat layer 2 is coated on the one surface 3 a side of the base film 3. The performance of the hard coat layer 2 is not particularly limited, but those imparted with performance such as fingerprint resistance and light resistance are preferable.

  The method for forming the hard coat layer 2 is not particularly limited, and may be laminated by applying a curable composition containing an ionizing radiation curable compound and irradiating with ionizing radiation to cure, or Lamination can be done by applying and drying a thermoplastic resin or a thermosetting resin solution, but a curable composition containing an ionizing radiation curable compound is applied and cured by irradiation with ionizing radiation and laminated. It is preferable.

The ionizing radiation curable compound is cured by irradiation with ionizing radiation, and an ultraviolet curable compound, an electron beam curable compound, and the like are preferable, and an ultraviolet curable compound is particularly preferable.
As the ionizing radiation curable compound, unsaturated monomers, oligomers, resins or compositions containing them are preferable. Specific examples thereof include polyfunctional acrylates, polyfunctional compounds having two or more functional groups such as urethane acrylates and polyester acrylates. A functional ionizing radiation curable acrylic compound is more preferable, and urethane acrylate and polyester acrylate are particularly preferable.

  Polyfunctional acrylates include ethylene glycol di (meth) acrylate, propylene glycol di (meth) acrylate, butylene glycol di (meth) acrylate, neopentyl glycol di (meth) acrylate, hexanediol di (meth) acrylate, and trimethylolethane. Tri (meth) acrylate, trimethylolpropane tri (meth) acrylate, pentaerythritol tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, dipentaerythritol penta (meth) acrylate, dipentaerythritol hexa (meth) acrylate, glycerol Tri (meth) acrylate, triallyl (meth) acrylate, bisphenol A ethylene oxide modified di (meth) acrylate, etc. It is.

The urethane acrylate can be obtained, for example, by esterification by a reaction between a hydroxyl group of a polyurethane oligomer obtained by a reaction between a polyether polyol or a polyester polyol and a polyisocyanate and (meth) acrylic acid.
Polyester acrylate is obtained by, for example, esterifying the hydroxyl group of a polyester oligomer having hydroxyl groups at both ends obtained by condensation of a polyvalent carboxylic acid and a polyhydric alcohol with (meth) acrylic acid, or by adding an alkylene oxide to the polyvalent carboxylic acid. It can be obtained by esterifying the terminal hydroxyl group of the oligomer obtained by addition with (meth) acrylic acid.
An ionizing radiation curable compound may be used individually by 1 type, and may be used in combination of 2 or more type.

Examples of the ionizing radiation include ultraviolet rays, electron beams, α rays, and β rays. When ultraviolet rays are used, the curable composition preferably contains a photopolymerization initiator.
As the photopolymerization initiator, known photopolymerization initiators such as acetophenone and benzophenone can be used, and oligomer type photopolymerization initiators can also be used.
A photoinitiator may be used individually by 1 type and may be used in combination of 2 or more type.
The blending ratio of the ionizing radiation curable compound and the photopolymerization initiator is usually preferably 0.01 to 20 parts by mass, particularly 0.1 to 10 parts by mass with respect to 100 parts by mass of the ionizing radiation curable compound. preferable.

The curable composition may contain fillers such as silica (including colloidal silica), silicon powder, mica, glass beads, acrylic fine powder, and hollow particles, but it is preferable not to include them.
Further, the curable composition includes a light stabilizer, an ultraviolet absorber, a catalyst, a colorant, an antistatic agent, a lubricant, a leveling agent, an antifoaming agent, a polymerization accelerator, an antioxidant, a flame retardant, an infrared absorber, Inclusion of additional components such as a surfactant and a surface modifier is optional.

  The curable composition may contain a diluent for easy application. Diluents include alcohols such as isobutanol, isopropanol, methyl cellosolve, ethyl cellosolve, aromatic hydrocarbons such as benzene, toluene, xylene, aliphatic hydrocarbons such as hexane, heptane, octane, nonane, decane, methyl ethyl ketone, Examples include ketones such as diethyl ketone and diisopropyl ketone. What is necessary is just to select the compounding quantity of a diluent suitably so that it may become a required viscosity.

  In the present invention, the curable composition is applied to the surface 3a side of the base film 3, and when it contains a diluent, it is dried and cured by irradiation with ionizing radiation, and is laminated as the hard coat layer 2. The When a diluent is not included, it is cured by irradiation with ionizing radiation without passing through a drying step. Examples of the method for applying the curable composition to the base film 3 include conventionally known methods such as a bar coating method, a knife coating method, a roll coating method, a blade coating method, a die coating method, a gravure coating method, and a curtain coating method. Is mentioned.

As the ionizing radiation to be irradiated, ionizing radiation generated from various ionizing radiation generators is used. For example, ultraviolet rays radiated from an ultraviolet lamp are usually used. As the ultraviolet lamp, an ultraviolet lamp such as a high-pressure mercury lamp, a fusion H lamp, or a xenon lamp that emits ultraviolet light having a spectral distribution in a wavelength range of 300 to 400 nm is used, and the irradiation amount is usually 50 to 3000 mJ / cm. ² is preferred.

  The thickness of the hard coat layer 2 is not particularly limited, but is preferably 1 μm to 20 μm, more preferably 2 μm to 15 μm, and particularly preferably 5 μm to 10 μm.

In the present invention, the hard coat layer 2 is laminated on the surface 3a side of the base film 3, and the decorative print layer 4 partially provided on the other surface 3b side of the base film 3 is provided. Are stacked. There is no restriction | limiting in particular as a printing method for comprising the decorative printing layer 4, Gravure printing, screen printing, etc. can be used. As printing, not only frame-shaped electrode concealment printing but also printing with design properties may be performed.
The surface on which the decorative printing layer is laminated may be either the surface on which the hard coat layer of the base film is applied or the surface on which the hard coat is not applied. Moreover, even if the hard coat of a base film is given only to one side, it may be given to both surfaces.

  The paint for constituting the decorative printing layer 4 is not particularly limited, and a known paint can be used. For example, ultraviolet curable ink, oxidation polymerization ink, or the like can be used.

  The thickness of the decorative printing layer 4 is preferably 5 μm to 30 μm, more preferably 7 μm to 28 μm, and particularly preferably 10 μm to 25 μm. This is because if the thickness of the decorative printing layer 4 is 5 μm or more, sufficient concealability is obtained, and if it is less than 30 μm, the pressure-sensitive adhesive layer does not need to be thick and the total thickness does not increase.

  In the present invention, the pressure-sensitive adhesive layer 5 is laminated on the surface 3b of the base film 3 on the side of the hard coat layer side and the other surface 3b. The pressure-sensitive adhesive for constituting the pressure-sensitive adhesive layer 5 is not particularly limited, and known pressure-sensitive adhesives can be used. For example, acrylic pressure-sensitive adhesives, silicone-based pressure-sensitive adhesives, urethane-based pressure-sensitive adhesives, rubber-based pressure-sensitive adhesives, and polyester-based pressure-sensitive adhesives. An adhesive can be used.

  The thickness of the pressure-sensitive adhesive layer 5 is preferably 10 μm to 200 μm, more preferably 15 μm to 150 μm, and particularly preferably 20 μm to 100 μm. If the thickness of the pressure-sensitive adhesive layer is 10 μm or more, the step following ability to the uneven surface of the base film produced by applying the decorative printing layer can be obtained, and if it is less than 200 μm, the pressure-sensitive adhesive oozes out. This is because the suitability for processing does not deteriorate.

  As a method of applying the pressure-sensitive adhesive layer 5 to the surface 3b side of the base film 3, only the pressure-sensitive adhesive layer and the release sheet prepared by separately applying a pressure-sensitive adhesive-containing composition to the release sheet 6 and drying it. And a method of laminating by pressing a substrate-less pressure-sensitive adhesive sheet made of Examples of the method for applying the pressure-sensitive adhesive-containing composition include conventionally known methods such as bar coating, knife coating, roll coating, blade coating, die coating, gravure coating, and curtain coating. Moreover, as a method of laminating the pressure-sensitive adhesive layer 5, a method in which the pressure-sensitive adhesive-containing composition is directly applied to the surface 3b side of the base film 3 and dried is also exemplified.

  The storage elastic modulus at 23 ° C. of the pressure-sensitive adhesive layer 5 is preferably 0.01 MPa to 0.3 MPa, more preferably 0.03 MPa to 0.25 MPa, and particularly preferably 0.05 MPa to 0.2 MPa. If the storage elastic modulus of the pressure-sensitive adhesive layer 5 is 0.01 MPa or more, the shape stability of the pressure-sensitive adhesive layer is obtained, and if it is less than 0.3 MPa, bubbles are less likely to be mixed.

  According to this pressure-sensitive adhesive sheet 1 with a decorative print layer, the base film 3 coated with the hard coat layer 2 on the side of the surface 3a, the decorative print layer 4, and the pressure-sensitive adhesive layer 5 are laminated in this order. Therefore, in the manufacture of the mobile terminal device, by using this pressure-sensitive adhesive sheet 1 with a decorative print layer, it is possible to cope with improvement in yield in the process, reduction in the number of processes, flattening of the information display part surface of the mobile terminal device, and the like. it can.

(2) Second Embodiment FIG. 2 is a schematic sectional view showing a second embodiment of the pressure-sensitive adhesive sheet with a decorative print layer of the present invention, and FIG. 3 is a schematic plan view thereof.
In this embodiment, the decorative printed layer-attached pressure-sensitive adhesive sheet 1 ′ includes a hard coat layer 2, a base film 3, a decorative print layer 4 partially provided on the base film 3, a pressure-sensitive adhesive layer 5, and a release sheet. 6 are stacked in this order. 2 and 3, the decorative print layer 4 shows a frame-like print pattern, but the decorative print layer-attached pressure-sensitive adhesive sheet of the present invention is not limited to this, for example, a print pattern having design properties. Also good.
This decorative printed layer-attached pressure-sensitive adhesive sheet 1 ′ is applied to a surface protective sheet of a mobile terminal device such as a mobile phone or a mobile device, as in the first embodiment.

FIG. 4 is a schematic cross-sectional view showing a punched-out pressure-sensitive adhesive sheet with a decorative print layer according to the second embodiment of the present invention, and FIG. 5 is a schematic plan view thereof.
In FIG. 4, the same components as those of the decorative printed layer-attached pressure-sensitive adhesive sheet 1 ′ shown in FIG. The pressure-sensitive adhesive sheet 7 with a decorative print layer of the present invention is a state in which at least the hard coat layer 2, the base film 3 and the pressure-sensitive adhesive layer 5 are punched out according to the shape of the adherend leaving the release sheet 6. That is, only the release sheet 6 is not cut, and the other layers are completely punched out. Whether the decorative print layer is punched depends on the printed range. 4 and 5 show an example in which a portion of the decorative print layer 4 having a frame shape is punched out.
By performing the punching process, the pressure-sensitive adhesive sheet 7 with a decorative print layer of the present invention can be easily attached to an adherend.

  The second embodiment will be described below with reference to FIG. In the pressure-sensitive adhesive sheet with a decorative print layer 1 ′, in addition to the structure of the pressure-sensitive adhesive sheet with a decorative print layer 1 of the first embodiment, a release sheet 6 is further laminated on the surface 5 a side of the pressure-sensitive adhesive layer 5. Yes.

A release sheet 6 is preferably laminated on the surface 5 a side of the pressure-sensitive adhesive layer 5. Although various release sheets can be used as the release sheet 6, the release sheet 6 is typically composed of a sheet material having peelability on the surface. Examples of the sheet material include films such as polyester resin, polyethylene resin, polypropylene resin, polystyrene resin, and polycarbonate resin, films in which fillers such as fillers are blended with these films, and synthetic paper. Moreover, paper base materials, such as glassine paper, clay coat paper, and quality paper, are mentioned.
In order to impart peelability to the surface of the sheet material, a release agent such as a thermosetting silicone resin or an ultraviolet curable silicone resin is attached to the surface by coating. The coating amount of the release agent is preferably 0.03~3.0g / ^{m 2.}
The release sheet 6 is laminated with the surface having the release agent in contact with the pressure-sensitive adhesive layer 5. It is particularly preferable that the laminated hard coat layer 2, base film 3 and pressure-sensitive adhesive layer 5 are left out according to the shape of the adherend, leaving the release sheet 6.

  As a blade and a processing machine used for the punching process, known ones can be used without any particular limitation. For example, a blade such as a Thomson blade, an etching blade, an engraving blade, a processing machine such as a die cut roll, a laser device, or the like can be used.

According to this decorative printed layer-attached pressure-sensitive adhesive sheet 1 ′, as in the first embodiment, in the manufacture of portable terminal devices, the yield in the process is improved, the number of steps is reduced, and the information display unit surface of the portable terminal device is flattened. Etc. Furthermore, in addition to the structure of the pressure-sensitive adhesive sheet 1 with a decorative print layer of the first embodiment, the pressure-sensitive adhesive sheet 1 ′ with a decorative print layer is further laminated with a release sheet 6 on the surface 5a side of the pressure-sensitive adhesive layer 5. Therefore, it is excellent in terms of convenience.
Further, according to the pressure-sensitive adhesive sheet 7 with a decorative print layer, the convenience of the anti-scattering pressure-sensitive adhesive sheet 1 ′ is further improved by performing a punching process according to the shape of the adherend.

  Next, with reference to FIG. 2, the manufacturing method of the adhesive sheet 1 'with a decorative print layer is demonstrated.

  A coating agent containing a curable composition is applied to the surface 3a side of the base film 3 with a coating means such as a Mayer bar, dried as necessary, and irradiated with ionizing radiation, for example, ultraviolet rays. It hardens | cures and laminates | coats the hard-coat layer 2 (process A).

  Next, printing is performed on the surface 3b side of the base film 3 using a printing machine, and the decorative printing layer 4 is laminated (step B).

  Next, as a method of laminating the pressure-sensitive adhesive layer 5, a method of laminating by pressing a base material-less pressure-sensitive adhesive sheet made of the pressure-sensitive adhesive layer 5 can be mentioned (Step C). This base material-less pressure-sensitive adhesive sheet is prepared by separately applying a pressure-sensitive adhesive-containing composition to the release sheet 6 and drying it. By the process C, the adhesive printed layer-attached pressure-sensitive adhesive sheet 1 ′ is obtained.

  Moreover, the coating agent containing the said adhesive containing composition is apply | coated to the surface 3b side of the base film 3, for example with a coating means like a knife coater, it dries, and the adhesive layer 5 is laminated | stacked. A method may also be mentioned (step C ′).

  Subsequent to step C ′, the release sheet 6 is laminated on the pressure-sensitive adhesive layer 5 to obtain a pressure-sensitive adhesive sheet 1 ′ with a decorative print layer.

  According to the method for producing a pressure-sensitive adhesive sheet with a decorative print layer 1 ′ of the present invention, the base material is made of a pressure-sensitive adhesive layer 5 that is printed on the surface 3 b side of the base film 3 and further provided with a step following performance. By pressing the pressure-sensitive adhesive sheet, air pockets can be minimized, and the pressure-sensitive adhesive sheet 1 with a decorative print layer can be obtained.

  In addition, as FIG. 4 shows, you may carry out a punching process to a defined shape, for example using a die-cut roll.

(3) Third Embodiment FIG. 6 is a schematic cross-sectional view showing a third embodiment of the pressure-sensitive adhesive sheet with a decorative print layer of the present invention. In FIG. 6, the same components as those of the pressure-sensitive adhesive sheet 1 with a decorative print layer shown in FIG.
This pressure-sensitive adhesive sheet with a decorative print layer 8 is applied to a surface protection sheet of a mobile terminal device such as a mobile phone or a mobile device, as in the first embodiment.

In the pressure-sensitive adhesive sheet 8 with a decorative print layer, in addition to the structure of the pressure-sensitive adhesive sheet with a decorative print layer 1 ′ of the second embodiment, a hard coat layer 9 is laminated on the surface 3 b side of the base film 3. Yes.
Further, the decorative print layer 4 is partially provided on the other surface 3 b side of the base film via the hard coat layer 9.

FIG. 7: is a schematic sectional drawing which shows what was punch-processed in 3rd embodiment of the adhesive sheet with a decorative print layer of this invention.
Similarly to the second embodiment, by performing a punching process, the pressure-sensitive adhesive sheet 10 with a decorative print layer can be easily attached to an adherend.

  The performance of the hard coat layer 9 is not particularly limited, but those having good adhesion to the decorative printing layer 4 and the pressure-sensitive adhesive layer 5 are preferable.

  According to this pressure-sensitive adhesive sheet with a decorative print layer 8, in addition to the pressure-sensitive adhesive sheet with a decorative print layer 1 ′ of the second embodiment, the hard coat layer 9 is further laminated on the surface 3b side of the base film 3. Thus, in addition to the effect of the pressure-sensitive adhesive sheet 1 ′ with a decorative print layer, the curl resistance is improved after the hard coat layer laminating step (step D) to be described later until the pressure-sensitive adhesive layer laminating step (step F). In particular, the yield in the manufacturing process of the decorative printed layer-attached pressure-sensitive adhesive sheet 8 can be improved. Therefore, in order to improve the yield in the manufacturing process of the pressure-sensitive adhesive sheet 8 with a decorative print layer, it is preferable that the hard coat layer 9 is provided on the surface 3b side of the base film 3.

  Next, with reference to FIG. 6, the manufacturing method of the adhesive sheet 8 with a decoration printing layer is demonstrated.

  After step A in the second embodiment, a coating agent containing a curable composition is applied to the surface 3b side of the base film 3 with a coating means such as a Mayer bar, and dried as necessary. And hardened by irradiating with ionizing radiation, for example, ultraviolet rays, and laminating the hard coat layer 9 (step D).

  Next, printing is performed on the side of the surface 9a of the hard coat layer 9 by using a printing machine to form the decorative print layer 4 (step E).

  Subsequent to step E, the substrate-less pressure-sensitive adhesive sheet made of the release sheet 6 coated with the pressure-sensitive adhesive layer 5 is pressed against the surface 9a side of the hard coat layer 9 to obtain a pressure-sensitive adhesive sheet 8 with a decorative print layer ( Step F).

  Moreover, the method of apply | coating the coating agent containing the said adhesive containing composition with the knife coater on the surface 9a side of the hard-coat layer 9, for example, and drying and laminating | stacking the adhesive layer 5 is also mentioned (process F '). ).

  Subsequent to step F ′, the release sheet 6 is laminated on the pressure-sensitive adhesive layer 5 to obtain a pressure-sensitive adhesive sheet 8 with a decorative print layer.

  According to the method for manufacturing the pressure-sensitive adhesive sheet 8 with a decorative print layer of the present invention, in addition to the method for manufacturing the pressure-sensitive adhesive sheet with a decorative print layer 1 ′ of the second embodiment, on the surface 3 b side of the base film 3. By adding the process of laminating | stacking the hard-coat layer 9, in addition to the effect by the manufacturing method of adhesive sheet 1 'with a decorative print layer, the yield of the adhesive sheet 8 with a decorative print layer can be improved.

  In addition, as FIG. 7 shows, you may carry out a punching process to a defined shape, for example using a die-cut roll.

The portable terminal device of the present invention uses the pressure-sensitive adhesive sheet with a decorative print layer of the present invention as a surface protective sheet.
In recent years, the miniaturization of portable terminal devices has brought the light source and the display panel closer to each other, so light from the light source is likely to leak to the outside through an adhesive layer sandwiched between the light source and the panel. In particular, when light leaks from the edge of the image, the display surface of the panel becomes difficult to see.
By using the pressure-sensitive adhesive sheet with a decorative print layer of the present invention as a surface protective sheet, the mobile terminal device of the present invention has a partial light shielding property by providing a decorative print layer in a portion where light easily leaks to the outside. And the above inconvenience can be solved.

  EXAMPLES Hereinafter, although an Example demonstrates this invention further more concretely, this invention is not limited to a following example.

(Create various components)
Production of Hard Coat Film 1 UV curing resin (manufactured by Arakawa Chemical Industry Co., Ltd., product name “Beam Set 575CB”, concentration 100%, with photopolymerization initiator), 100 parts by weight leveling agent (manufactured by Big Chemie Japan Co., Ltd., product) (Name "BYK-355", concentration 52%) 0.1 part by weight was added and diluted with propylene glycol monomethyl ether to prepare a 40% concentration coating solution. Next, it was applied to one side of a double-sided easy-adhesive PET film (product name “Cosmo Shine 100A4300”, film thickness 100 μm, manufactured by Toyobo Co., Ltd.) using Meyer bar # 12 so that the film thickness after drying was 5 μm. The agent was applied, dried, and cured by irradiating with ultraviolet rays (illuminance 230 mW / cm, light amount 230 mJ / cm ² ) to obtain a hard coat film 1.

Preparation of substrate-less pressure-sensitive adhesive sheet 1 Acrylate ester copolymer (molecular weight 800,000, concentration) obtained by copolymerization of 79% by weight of n-butyl acrylate, 20% by weight of methyl acrylate, and 1% by weight of hydroxyethyl acrylate 35 parts by weight) To 100 parts by weight, 0.1 part by weight of toluene and xylylene diisocyanate trifunctional adduct (manufactured by Soken Chemical Co., Ltd., product name: TD-75, concentration 75% by weight) was added and stirred. A pressure-sensitive adhesive coating solution was prepared. Apply to the release-treated surface of a heavy release sheet (product name “SP-PET38T103-1”, film thickness 38 μm, manufactured by Lintec Corporation) using a knife coater so that the film thickness after drying is 60 μm, and after drying, The substrate was bonded to a light release sheet (product name “SP-PET 381031H”, film thickness 38 μm, manufactured by Lintec Corporation) to obtain a substrate-less pressure-sensitive adhesive sheet 1.

Preparation of substrate-less pressure-sensitive adhesive sheet 2 An acrylic ester copolymer (molecular weight 1 million, concentration 30 weight) obtained by copolymerizing 77% by weight of n-butyl acrylate, 20% by weight of ethyl acrylate, and 3% by weight of acrylic acid %) To 100 parts by weight, 4 parts by weight of toluene and a metal chelate-based curing agent (manufactured by Soken Chemical Co., Ltd., product name “M-5A”, concentration 4.95%) are added, stirred, and an adhesive coating solution is prepared. Prepared. Apply to the release-treated surface of a heavy release sheet (product name “SP-PET38T103-1”, film thickness 38 μm, manufactured by Lintec Corporation) using a knife coater so that the film thickness after drying is 60 μm, and after drying, The substrate-less pressure-sensitive adhesive sheet 2 was obtained by pasting together with a light release sheet (product name “SP-PET 381031H”, film thickness 38 μm, manufactured by Lintec Corporation).

Example 1
Using a printing machine (Lintec Co., Ltd., apparatus name LPM-300), pattern printing by flexographic printing on the non-coated surface of the hard coat film 1 (printing liquid: Teikoku Ink Manufacturing Co., Ltd., product name: UVFIL screen ink (black) )). At that time, printing of 7 μm was performed three times to obtain a decorative printing layer of about 21 μm. On top of that, the pressure-sensitive adhesive surface of the substrate-less pressure-sensitive adhesive sheet 1 from which the light release-side release sheet was peeled was bonded. Furthermore, using a die-cut roll, it was punched into a predetermined shape to obtain a pressure-sensitive adhesive sheet with a decorative print layer corresponding to FIG.

(Example 2)
A pressure-sensitive adhesive sheet with a decorative print layer was obtained in the same manner as in Example 1 except that the base-less pressure-sensitive adhesive sheet 2 was used as the base-less pressure-sensitive adhesive sheet.

The properties of the pressure-sensitive adhesive sheet with a decorative print layer of Example 1 and Example 2 were measured by the following test methods, and the results are shown in Table 1.
(1) Total light transmittance The heavy release sheet of the pressure-sensitive adhesive sheet with a decorative print layer obtained in the examples was removed, and JIS was used using a haze meter (trade name “NDH2000” manufactured by Nippon Denshoku Co., Ltd.). Based on K7361-1, the total light transmittance of the non-printed part was measured.

(2) Haze The heavy release sheet of the pressure-sensitive adhesive sheet with a decorative printing layer obtained in the examples was removed, and a haze meter (trade name “NDH2000” manufactured by Nippon Denshoku Industries Co., Ltd.) was used in accordance with JIS K7136. Then, the haze of the non-printed part was measured.

(3) Storage elastic modulus The release sheet of the base material-less pressure-sensitive adhesive sheet obtained in the examples was removed, and a plurality of sheets were overlapped to form a sheet sample having a thickness of 2.0 mm. The formed sheet sample was measured for storage elastic modulus at 23 ° C. at a measurement frequency of 1 Hz using a viscoelasticity measuring device (trade name “RDAII” manufactured by Rheometric Scientific F.E.).

(4) Appearance It was visually confirmed whether or not there were bubbles at the edge of the decorative print layer. It was judged as “◯” when no bubbles were generated and “X” when bubbles were generated. Although there was no problem with the appearance, it was marked with Δ when some bubbles were generated.

  As shown in Table 1, by printing on the other surface side of the base film, and further pressing the base material-less pressure-sensitive adhesive sheet made of a release sheet coated with a pressure-sensitive adhesive layer provided with a step following performance, The pressure-sensitive adhesive sheet with a decorative print layer in which the air gap was filled and thinned was obtained. Particularly, in Example 2 where the storage elastic modulus was 0.28 MPa, some bubbles were generated, whereas in Example 1 where the storage elastic modulus was 0.08 MPa, no bubbles were generated.

1, 1 ', 7, 8, 10 Adhesive sheet with decorative print layer 2, 9 Hard coat layer 3 Base film 4 Decorated print layer 5 Adhesive layer 6 Release sheet

Claims (9)

  A base film provided with a hard coat layer on at least one surface side, a decorative printing layer partially provided on the other surface side of the base film, and an adhesive layer are laminated in this order. A pressure-sensitive adhesive sheet with a decorative print layer, which is characterized in that   The pressure-sensitive adhesive sheet with a decorative print layer according to claim 1, wherein a decorative print layer is partially provided on the other surface side of the base film via a hard coat layer.   The pressure-sensitive adhesive sheet with a decorative print layer according to claim 1 or 2, wherein the base film, the decorative print layer, the pressure-sensitive adhesive layer, and a release sheet are laminated in this order.   The pressure-sensitive adhesive sheet with a decorative print layer according to claim 3, wherein the hard coat layer, the base film and the pressure-sensitive adhesive layer are punched out according to the shape of the adherend, leaving the release sheet.   The pressure-sensitive adhesive sheet with a decorative print layer according to any one of claims 1 to 4, wherein the substrate film is a polyethylene terephthalate film or a polycarbonate film.   The pressure-sensitive adhesive sheet with a decorative print layer according to any one of claims 1 to 5, wherein the pressure-sensitive adhesive layer has a storage elastic modulus at 23 ° C of 0.01 to 0.3 MPa.   The pressure-sensitive adhesive sheet with a decorative print layer according to any one of claims 1 to 6, which is used as a surface protective sheet for a mobile terminal device.   It is a manufacturing method of the adhesive sheet with a decorating printing layer in any one of Claims 3-7, Comprising: It decorates and prints partially on one surface of the said base film, Furthermore, the said adhesive layer and the said A base film, a decorative printing layer, a pressure-sensitive adhesive layer, and a release sheet are obtained by laminating the pressure-sensitive adhesive surface of the base material-less pressure-sensitive adhesive sheet on which the release sheet is laminated with the surface having the decorative print layer of the base film. A method for producing a pressure-sensitive adhesive sheet with a decorative print layer, which is laminated in this order. A portable terminal device having partial light shielding properties by the pressure-sensitive adhesive sheet with a decorative print layer according to any one of claims 1 to 7.

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