WO2020059855A1 - Adhesive sheet - Google Patents

Adhesive sheet Download PDF

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Publication number
WO2020059855A1
WO2020059855A1 PCT/JP2019/036990 JP2019036990W WO2020059855A1 WO 2020059855 A1 WO2020059855 A1 WO 2020059855A1 JP 2019036990 W JP2019036990 W JP 2019036990W WO 2020059855 A1 WO2020059855 A1 WO 2020059855A1
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WO
WIPO (PCT)
Prior art keywords
sheet
pressure
sensitive adhesive
layer
adhesive layer
Prior art date
Application number
PCT/JP2019/036990
Other languages
French (fr)
Japanese (ja)
Inventor
将志 関
上山　弘徳
Original Assignee
大日本印刷株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 大日本印刷株式会社 filed Critical 大日本印刷株式会社
Publication of WO2020059855A1 publication Critical patent/WO2020059855A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form
    • B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
    • B32B3/30—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by a layer formed with recesses or projections, e.g. hollows, grooves, protuberances, ribs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/06—Interconnection of layers permitting easy separation
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J201/00—Adhesives based on unspecified macromolecular compounds
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
    • C09J7/38—Pressure-sensitive adhesives [PSA]

Definitions

  • the present invention relates to an adhesive sheet.
  • an adhesive is applied to a decorative sheet and laminated (attached) to wood, non-combustible material, or the like.
  • an adhesive instead of the adhesive, it is difficult to reuse a decorative sheet in the form of lamination using a conventional adhesive, such as re-peeling and re-attaching. If the preparation of a cosmetic material fails due to wrinkles during application, it is necessary to peel off the decorative sheet and discard it, or to reuse the adherend, it is necessary to clean the adhesive layer remaining on the adherend surface. Was. For this reason, the production of a decorative material using a decorative sheet and the work of attaching the decorative sheet require special equipment or a skilled technique (person). it was high.
  • Patent Document 1 discloses a technique relating to a micro suction cup film formed of an adhesive layer having a large number of fine suction cup groups on an adherend side surface. Since this micro suction cup film can be reversibly attached and peeled to and from an adherend, if an adhesive layer comprising such a micro suction cup film can be provided on the pressure-sensitive adhesive sheet, a pressure-sensitive adhesive sheet having reworkability can be obtained. It is considered possible.
  • the composition disclosed in Patent Literature 1 is capable of producing a micro suction cup film even at a temperature of about room temperature, when the applied composition is dried at room temperature, a very long drying time is required. In practice, drying while heating was required.
  • a pressure-sensitive adhesive sheet is provided with a resin layer in which a concave-convex shape for improving design properties is provided, or a printed layer is provided.
  • a pressure-sensitive adhesive sheet provided with a resin layer, a printing layer, etc. if heated during manufacturing for the formation of a micro suction cup film, the shape of the uneven shape changes, and in severe cases, the uneven shape disappears, or the resin layer or There is a possibility that the printed layer or the like may be damaged, and the above-mentioned composition cannot be applied to the pressure-sensitive adhesive sheet and used.
  • An object of the present invention is to provide a pressure-sensitive adhesive sheet having reworkability.
  • the present invention solves the above problems by the following means.
  • description is given with reference numerals corresponding to the embodiment of the present invention, but the present invention is not limited to this.
  • a first sheet (10), an adhesive layer (13) laminated on a back surface of the first sheet (10), and the first sheet (10) of the adhesive layer (13) are:
  • the concave shape (13a) is uniformly formed on both surfaces of the pressure-sensitive adhesive layer (13). Sheet (1).
  • the average value of the diameters of the respective openings of the concave shape (13a) opening on the surface on the first sheet (10) side is D. ave 1 and
  • the pressure-sensitive adhesive sheet (1) which satisfies a relationship of ave 2 ⁇ 0.5.
  • a fourth invention is the pressure-sensitive adhesive sheet (1) according to any one of the first invention to the third invention, wherein the thickness t of the pressure-sensitive adhesive layer (13) is in a range of 20 ⁇ m ⁇ t ⁇ 40 ⁇ m.
  • An adhesive sheet (1) characterized in that:
  • the pressure-sensitive adhesive layer (13) includes bubbles in the liquid resin composition (130).
  • the first sheet (10) and the second sheet (14) are both peelable.
  • the pressure-sensitive adhesive sheet (1) comprising a base sheet (14).
  • the first sheet (10) is a surface layer sheet (10) which becomes a surface after pasting.
  • the second sheet (14) is a pressure-sensitive adhesive sheet (1), which is a peelable substrate sheet (14).
  • the pressure-sensitive adhesive layer (13) is obtained by applying a liquid resin composition (130) to the peelable substrate sheet (14). After drying by drying, the surface layer sheet (10) is laminated to constitute the pressure-sensitive adhesive sheet (1).
  • the surface sheet (10) is formed of paper or a thermoplastic resin. It is a pressure-sensitive adhesive sheet (1).
  • a pressure-sensitive adhesive sheet having reworkability can be provided.
  • FIG. 9 is a diagram showing observation results of Sample 1.
  • FIG. 9 is a diagram showing observation results of Sample 2.
  • FIG. 9 is a diagram showing observation results of Sample 3.
  • FIG. 9 is a diagram showing observation results of Sample 4.
  • FIG. 1 is a view showing a first embodiment of a decorative sheet according to the present invention.
  • each figure shown below including FIG. 1 is a diagram schematically shown, and the size and shape of each part are exaggerated as appropriate for easy understanding.
  • specific numerical values, shapes, materials, and the like will be described, but these can be changed as appropriate.
  • the terms such as plate, sheet, and film are used, but these are generally used in the order of thickness, plate, sheet, and film in the order of thickness. I use it even in the book. However, since such use does not have a technical meaning, these terms can be appropriately replaced.
  • the first sheet is provided with a resin layer 12 having an irregular shape (irregular pattern) on the surface on the side exposed to the outside so as to be observable after lamination with the substrate 11.
  • a resin layer 12 having an irregular shape (irregular pattern) on the surface on the side exposed to the outside so as to be observable after lamination with the substrate 11.
  • a description will be given with reference to the decorative sheet 1 composed of the surface layer sheet 10 described above.
  • various types of pressure-sensitive adhesive sheets having only the printing layer without the resin layer 12 on the base material 11 may be used.
  • the resin layer 12 and the printing layer may be provided, or the resin layer 12 may not be provided on the base material 11 and only the unevenness may be provided on the base material surface.
  • the same configuration can be applied to various types of pressure-sensitive adhesive sheets other than the decorative sheet.
  • the decorative sheet 1 includes a first sheet formed by laminating and bonding a substrate 11 and a resin layer 12, an adhesive layer 13, and a peelable substrate sheet 14. ing.
  • the base material 11 is a layer serving as a base necessary for forming the resin layer 12.
  • paper may be used as a material, or a resin sheet may be used as a material.
  • the resin layer 12 is laminated on the front surface of the base material 11, and a plurality of irregularities are formed on the surface.
  • the resin layer 12 shown in FIG. 1 is shown as a single layer for easy understanding, the resin layer 12 may be composed of a plurality of layers having different compositions and structures.
  • the uneven shape of the resin layer 12 may represent, for example, a pipe of wood, a surface unevenness of a fabric, or an uneven shape of a stone material. It may be in a form.
  • Examples of the resin forming the resin layer 12 include cellulose resin, polycarbonate resin, acrylic resin, styrene butadiene resin (styrene butadiene rubber), polyisoprene, natural rubber, ethylene propylene rubber (EPR), and ethylene propylene diene ternary copolymer.
  • EPDM Combined rubber
  • polynorbornene polybutadiene, nitrile rubber, chloroprene rubber, butyl rubber, halogenated butyl rubber, ethylene-vinyl acetate rubber (EVA), polyurethane, silicone rubber, fluorine rubber, ethylene acrylic rubber, polyester elastomer, epichlorohydrin rubber, many Sulfurized rubber, chlorinated polyethylene, polyethylene, polystyrene, polyimide, polyvinyl chloride, polypropylene; polyolefin, polyurethane, polyester, poly Bromide system, and include polystyrene thermoplastic elastomer.
  • the first sheet 10 has been described with an example in which the base material 11 is directly laminated and bonded on the resin layer 12, but the present invention is not limited thereto.
  • another layer may be provided between the base material 11 and the resin layer 12.
  • a printed layer (pattern layer) on which a pattern is printed may be provided between the base material 11 and the resin layer 12, and the whole or a part of the resin layer 12 may be made of a transparent resin.
  • the adhesive layer 13 is laminated on the surface of the substrate 11 opposite to the resin layer 12 (the lower surface in FIG. 1, which is also referred to as the back surface of the substrate 11). This is a layer having adhesiveness to the adherend 50 (see FIG. 2).
  • the adhesive layer 13 has a plurality of concave shapes 13a opened on both surfaces thereof. Further, the adhesive layer 13 has elasticity, and since the plurality of concave shapes 13a each act as a fine suction cup, the adhesive layer 13 can exhibit adhesive force (adsorption force) to various adherends 50. (See FIG. 2 (c)).
  • the adhesive layer 13 is formed, for example, using a liquid resin composition (acryl emulsion) disclosed in Patent Document 1 (Japanese Patent Application Laid-Open No.
  • the thickness t of the adhesive layer 13 is desirably 1 ⁇ m or more and 500 ⁇ m or less.
  • the thickness t of the adhesive layer 13 is desirably 1 ⁇ m or more and 500 ⁇ m or less.
  • the thickness is below the lower limit of the above-mentioned layer thickness range, it is difficult to form a concave shape, or the size of the concave shape becomes too small, so that the adhesion (adsorption) characteristics deteriorate.
  • the thickness exceeds the upper limit of the above-mentioned thickness range the flexibility of the decorative sheet is reduced and workability is deteriorated.
  • the thickness t of the adhesive layer 13 is desirably in the range of 20 ⁇ m ⁇ t ⁇ 40 ⁇ m. This will be described later.
  • the size and density of the concave shape 13a of the adhesive layer 13 can be adjusted by changing various conditions in a manufacturing process described later.
  • the density of the adhesive layer 13 can be used as an index indicating the degree to which the concave shape 13a is included in the adhesive layer 13.
  • the density of the adhesive layer 13 is not particularly limited, but may be, for example, 0.1 g / cm 3 or more and 0.6 g / cm 3 or less.
  • the size of the concave shape 13a is not particularly limited, but may be, for example, 1 ⁇ m or more and 300 ⁇ m or less.
  • the second sheet 14, which is a peelable substrate sheet, is on the opposite side of the adhesive layer 13 from the substrate 11 (the lower surface in FIG. 1, which is also referred to as the back surface of the adhesive layer 13). Are laminated.
  • the peelable base sheet 14 is provided in consideration of the handling property until the decorative sheet 1 is used, and the decorative sheet 1 is attached to the adherend 50 when the decorative sheet 1 is used, that is, on the adherend 50. When peeled off.
  • various types of conventionally known release films, separate papers, separate films, separate papers, release films, release papers and the like can be used as appropriate. For example, high quality paper, coated paper, impregnated paper, plastic film or the like having a release layer formed on one or both sides may be used.
  • the release layer is not particularly limited as long as it has a release property, and examples thereof include a silicone resin, an organic resin-modified silicone resin, a fluorine resin, an aminoalkyd resin, a melamine resin, an acrylic resin, and a polyester resin. Can be mentioned. These resins can be used in any of an emulsion type, a solvent type and a solventless type.
  • a release film having a release layer for example, a silicone release type PET (polyethylene terephthalate) film, an untreated PET film, a PP film, a silicone release type paper, or the like can be used.
  • the thickness of the releasable base material sheet 14 is preferably, for example, not less than 10 ⁇ m and not more than 100 ⁇ m, more preferably not less than 20 ⁇ m and not more than 60 ⁇ m.
  • the thickness is below the lower limit of the above-mentioned layer thickness range, there is no stiffness and it becomes difficult to peel off.
  • the thickness exceeds the upper limit of the above-mentioned thickness range, the stiffness is too strong and the workability at the time of bonding is reduced.
  • a commercially available product may be used as the releasable substrate sheet 14.
  • a 38 ⁇ m-thick polyester film (Mitsui Chemicals Tosello Co., Ltd.) having one surface subjected to an easy-peeling treatment with a silicone-based releasing agent may be used. And trade name: SP-PET-01).
  • FIG. 2 is a figure which shows the form at the time of use of the decorative sheet 1 sequentially.
  • the decorative sheet 1 described above includes a releasable base sheet 14 as shown in FIG.
  • the peelable substrate sheet 14 is peeled off (FIG. 2B).
  • the exposed pressure-sensitive adhesive layer 13 is attached to the adherend 50, and by applying an appropriate pressure to the surface thereof, a large number of concave shapes 13a existing on the exposed surface of the pressure-sensitive adhesive layer are elastically deformed.
  • it is adsorbed (adhered) to the adherend 50 (FIG. 2C).
  • the adhesive layer 13 is manufactured, if the amount of the concave shape 13a is adjusted, for example, using the density as a parameter, the adhesive force (adsorption force) of the adhesive layer 13 can be adjusted.
  • FIG. 3 is a diagram illustrating a manufacturing device of the decorative sheet 1.
  • FIG. 4 is a diagram illustrating a method for manufacturing the decorative sheet 1.
  • a composition of an acrylic emulsion disclosed in Patent Document 1 for forming the adhesive layer 13 is put into a stirrer 301, and the composition is mixed with nitrogen via a pipe 302. Stirring is performed while mixing the gas to prepare the bubble-containing composition 130 including the bubble B in the composition (P1: foaming step in the figure).
  • the bubble-containing composition 130 is applied on the releasable base material sheet (second sheet) 14 by the coating apparatus 303 (P2 in the figure: coating step).
  • a comma coater can be used as a coating device (coating unit), but other known coating methods may be used.
  • the bubble-containing composition 130 is heated by passing the bubble-containing composition 130 through the peelable substrate sheet 14 coated with the bubble-containing composition 130 in the drying device 304.
  • the adhesive layer 13 is formed (P3 in the figure: drying step).
  • a drying furnace having an internal atmosphere temperature of about 60 ° C. to 140 ° C. can be used.
  • the drying time may be, for example, about 30 seconds to 10 minutes.
  • drying may be promoted while blowing high-temperature air at a predetermined temperature to the bubble-containing composition 130. Further, other drying methods such as infrared radiation and dielectric heating can be adopted.
  • the concave shape 13a is formed on both surfaces of the bubble-containing composition 130, and the adhesive layer 13 is formed.
  • This concave shape 13a is formed by breaking bubbles contained in the bubble-containing composition 130 and leaving a part of the bubble shape.
  • the concave shape 13a hardly remains.
  • the drying step is performed under the condition that the foaming is performed in a state where the curing of the bubble-containing composition 130 has progressed to some extent. Therefore, the temperature and the amount of air blow in the drying process greatly affect the state of the concave shape 13a.
  • the surface layer sheet (first sheet) 10 having the substrate 11 and the resin layer 12 separately prepared using the laminating apparatus 305 is attached to the adhesive layer 13.
  • Bonding P4 in the figure: laminating step.
  • the laminating step since the lamination is performed by the attraction force (adhesion force) of the concave shape 13a of the adhesive layer 13, heating is not required, and the bonding can be performed with only a small pressing force. Therefore, there is no damage to the base material 11 and the resin layer 12 which are the surface sheets.
  • the decorative sheet 1 is completed.
  • the decorative sheet 1 can be efficiently produced without damaging the surface sheet by heat when the adhesive layer 13 is formed.
  • the decorative sheet may then be wound into a roll or cut into a required size.
  • the decorative sheet 1 of the present embodiment is actually produced, and results of comparison with a comparative example will be described.
  • the bubble-containing composition 130 having been subjected to the foaming step was applied to the peelable substrate sheet 14 on a biaxially stretched PET film having releasability using a comma coater having a clearance of 200 ⁇ m. .
  • This was dried in a drying path at 100 ° C. for 1 minute to form an adhesive layer 13, and a surface sheet was laminated to obtain a decorative sheet 1.
  • the density of the adhesive layer 13 was 0.39 g / cm 3 and the thickness was 50 ⁇ m.
  • FIG. 5 is an enlarged photograph of the pressure-sensitive adhesive layer 13 of the decorative sheet 1 of the example viewed from the direction of the adherend.
  • FIG. 6 is the figure expanded by the cross section of the direction orthogonal to the sheet surface of the adhesive layer 13 of the decorative sheet 1 of an Example. As shown in FIGS. 5 and 6, it can be confirmed that the adhesive layer 13 has a large number of concave shapes 13a.
  • a decorative sheet was prepared in the same manner as in the above example, except that the step of only foam was not performed.
  • the density of the pressure-sensitive adhesive layer after preparation was 0.87 g / cm 3 , and the thickness was 100 ⁇ m.
  • a decorative sheet (acrylic adhesive A type) in which an adhesive layer was prepared using an acrylic resin, SK2094 manufactured by Soken Chemical Co., Ltd. was prepared.
  • FIG. 7 is a diagram illustrating the peeling force of the example and the comparative example.
  • the peeling force in FIG. 7 is the result of measuring 180 ° peeling at a pulling speed of 300 mm / min using a tensile tester and measuring the peeling force at that time. The peeling force was measured immediately after the application (0 hour) and after 1000 hours from the application.
  • the peeling can be performed with a relatively small peeling force both immediately after the application and after the lapse of 1000 hours. With this level of peeling force, there is no spontaneous peeling, and it is possible to easily peel off by applying a force to peel. Moreover, since the suction is performed by the concave shape 13a, the adhesive layer 13 does not remain on the surface of the adherend 50 after peeling, and the adhesive force (peeling force) of the adhesive layer 13 itself does not substantially change. Pasting was possible. In Comparative Example 1, a small piece can be peeled with a relatively small peeling force, but a large size requires a certain force for peeling.
  • Comparative Example 2 requires a certain amount of force for peeling in the case of a large size, and can be peeled immediately after pasting, but after 1000 hours, the peeling force increases significantly. In such a case, it was difficult to peel off the sheet by hand, or there was a risk that the surface sheet would be damaged if the sheet was forcibly peeled off. In Comparative Example 3, the peeling force was too large immediately after the application, and the peeling was difficult by manual work, or the surface layer sheet might be damaged if it was forcibly peeled off. Also, in each of Comparative Examples 2 and 3, after peeling, a part of the adhesive material remained on the adherend, or the adhesive strength was reduced, so that it was not suitable for re-attaching. .
  • the concave shape 13a of the adhesive layer 13 has a large effect on the adhesive strength. If the concave shape 13a is not evenly provided on both surfaces of the adhesive layer 13, there is a possibility that one surface of the adhesive layer has reduced or increased adhesive force (adhesive force) as compared with the other surface. In addition, since the concave shape 13a is uniformly provided on both surfaces of the adhesive layer 13, the physical properties of the adhesive layer 13 are also uniform, and the surface sheet (first sheet) and the peelable base sheet (second sheet), Alternatively, it is preferable in terms of sufficient adhesion to both the surface layer sheet (first sheet) and the adherend and removability from the adherend.
  • Patent Document 1 Japanese Patent Application Laid-Open No. 2017-36404 does not consider anything at all, and states that it is only necessary to form a micro sucker.
  • FIG. 2 FIG. 2 of Patent Document 1 which is a cross-sectional photograph of Example 1 formed with a WET film thickness of 800 ⁇ m, a portion shown as a surface having a micro suction cup has a fine suction cup structure.
  • a micro suction cup (corresponding to the concave shape 13a in the present embodiment) is formed on one surface of the adhesive layer, but the micro suction cup (concave shape 13a) is formed on the other surface. Are not substantially formed.
  • the applicant also conducted a verification experiment.
  • a verification experiment four types of samples of the adhesive layer were prepared, and the concave shapes 13a on both surfaces thereof were observed by SEM.
  • the samples are the following four types.
  • Sample 4 adhesive layer thickness t ⁇ 2000 ⁇ m
  • the layer thickness of the sample is a layer thickness after drying.
  • the foam-containing composition after the foaming treatment was applied to the glass surface using a coater, and the drying treatment was performed using a drying oven at 100 degrees. Sample 4 was applied dropwise onto the glass surface and air-dried at room temperature. The reason for changing the drying conditions for Sample 4 is also to verify the description in Patent Document 1 that normal temperature drying is sufficient.
  • the density of the pressure-sensitive adhesive layer after the foaming treatment was 0.4 g / cm 3 .
  • FIG. 8 is a diagram showing the observation results of Sample 1.
  • FIG. 9 is a diagram showing the observation results of Sample 2.
  • FIG. 10 is a diagram showing the observation results of Sample 3.
  • FIG. 11 is a diagram showing the observation results of Sample 4.
  • the thickness t of the adhesive layer 13 is desirably in the range of 20 ⁇ m ⁇ t ⁇ 40 ⁇ m in order to uniformly provide the concave shapes 13 a on both surfaces of the adhesive layer 13.
  • the state in which the concave shapes 13a are evenly provided on both surfaces of the adhesive layer 13 more specifically satisfy the following relationship.
  • the average value of the diameter of each opening of the concave shape 13a opening on the surface on the surface layer sheet (first sheet) side is set to Dave 1, and each of the concave shapes 13a opening on the releasable base material sheet (second sheet) side.
  • the mean value of the diameters of the openings when the D ave 2
  • the surface sheet (first sheet) and the peelable substrate sheet (second sheet), or the surface sheet ( A sufficient adhesive force to both the first sheet) and the adherend and removability from the adherend can be exhibited well.
  • the average value of the diameters of the respective apertures is not practically possible to obtain the average of all the apertures. Therefore, in this case, the aperture having the larger diameter within the observation range of 1500 ⁇ m ⁇ 1100 ⁇ m is used. The diameter of each of the three openings was measured in order from, and the average value was obtained.
  • the pressure-sensitive adhesive sheet of the present invention As an embodiment of the pressure-sensitive adhesive sheet of the present invention, a decorative sheet that imparts a desired design appearance to various adherend surfaces has been described as an example.
  • the decorative sheet has various uses when classified more finely, and the pressure-sensitive adhesive sheet of the present invention can be applied in these various uses.
  • the pressure-sensitive adhesive sheet of the present invention is not limited to a decorative sheet and can be applied to various uses.
  • specific examples to which the pressure-sensitive adhesive sheet of the present invention can be suitably applied will be described.
  • the pressure-sensitive adhesive sheet of the present invention can be applied as a decorative sheet for floors. More specifically, for example, it can be applied to cushion floors, to square tiles, to non-slip sheets on stairs, to carpets, or to bath mats (bath floor coverings) or kitchen mats. (Kitchen floor rugs). Due to the easily peelable and re-attachable properties of the pressure-sensitive adhesive sheet of the present invention, not only can the workability at the time of building the house be improved, but also the interior redressing work by the resident himself after the building of the house, that is, a simple reform Can be easily constructed.
  • these floor decorative sheets are adsorbed (adhered) to the adherend by the adsorbing force (adhesive force) due to the numerous fine concave shapes 13a, they can be easily peeled off, there is no adhesive residue, and the adherend is not adhered. Since it is possible to prevent damage to the floor, it is possible to easily restore the state before the decorative sheet for floor is attached.
  • the decorative sheet for a wall is adsorbed (adhered) to the adherend by the adsorbing force (adhesive force) due to the numerous fine concave shapes 13a, it can be easily peeled off, there is no adhesive residue, and the adherend is not adhered. Can be prevented from being damaged, and it can be easily restored to the state before the wall decorative sheet was attached.
  • the pressure-sensitive adhesive sheet of the present invention can be applied as a decorative sheet for ceiling.
  • Specific examples of the decorative sheet for ceiling are the same as those exemplified for the decorative sheet for wall. Due to the easily peelable and re-attachable properties of the pressure-sensitive adhesive sheet of the present invention, not only can the workability at the time of building the house be improved, but also the interior redressing work by the resident himself after the building of the house, that is, a simple reform Can be easily constructed. In particular, the installation on the ceiling is difficult if ordinary wallpaper is used, but the installation is simple because there is no need to use water glue as in the case of conventional wallpaper.
  • the decorative sheet for ceiling is adsorbed (adhered) to the adherend by the adsorbing force (adhesive force) due to the numerous fine concave shapes 13a, it can be easily peeled off, there is no adhesive residue, and the adherend is not adhered. Can be easily restored to the state before the ceiling decorative sheet was attached.
  • the pressure-sensitive adhesive sheet of the present invention can be applied as a decorative sheet for fittings.
  • the ease of peeling and re-attachability of the pressure-sensitive adhesive sheet of the present invention not only can enhance the workability during the manufacturing of the fittings, but also the work of the resident himself after the construction of the house in the work of redressing the appearance of the fittings. It can also enhance the character. Since this decorative sheet for fittings is adsorbed (adhered) to the adherend by the adsorbing force (adhesive force) of the numerous fine concave shapes 13a, it can be easily peeled off, there is no adhesive residue, and the adherend is damaged.
  • fittings to which the decorative sheet for fittings are to be pasted include handrails, window frames (sashes), doors, door frames, brans, construction members (surrounding edges, Kamoi, waist walls, sills), and the like. , Or any other type.
  • the pressure-sensitive adhesive sheet of the present invention can be applied as a decorative sheet for furniture.
  • the ease of peeling and re-attachment of the pressure-sensitive adhesive sheet of the present invention not only can improve the workability during furniture manufacturing, but also can improve the workability of the work of refinishing the appearance of the furniture by the user himself after purchasing the furniture. Can also be increased. Since the decorative sheet for furniture is adsorbed (adhered) to the adherend by the adsorbing force (adhesive force) of the numerous fine concave shapes 13a, it can be easily peeled off, there is no adhesive residue, and the adherend is damaged. Can be easily restored to the state before the decorative sheet for furniture was attached.
  • furniture to which the decorative sheet for furniture is to be pasted for example, tables such as desks and dining tables, chests of drawers, shelves, beds and the like can be exemplified, but any other items may be used.
  • the pressure-sensitive adhesive sheet of the present invention is not limited to use as various decorative sheets in a house as described above, and may be used as an exterior sheet mainly used outdoors.
  • the ease of peeling and the re-attachment property of the pressure-sensitive adhesive sheet of the present invention can enhance the workability of the temporary re-dressing work of the exterior. Since this exterior sheet is adsorbed (adhered) to the adherend by the adsorbing force (adhesive force) of the numerous fine concave shapes 13a, it can be easily peeled off, there is no adhesive residue, and the adherend is damaged. Since it can be prevented, it is also possible to easily restore the state before the exterior sheet is attached.
  • the object to which the exterior sheet is to be attached may be, for example, an object related to a house such as an entrance door, various exteriors, windows, window frames, outer walls, or a moving object such as a vehicle. It may be something.
  • the pressure-sensitive adhesive sheet of the present invention is not limited to interior and exterior use, and may be used as a window sheet to be attached to a window.
  • the window sheet may be not only a decorative sheet mainly having a design property but also a functional sheet having various functions.
  • the functional sheet for example, may have the function of an optical filter that absorbs or reflects light in a specific wavelength range such as infrared light and ultraviolet light, may have an antifouling function, and may have a known function. It can be provided as appropriate.
  • a decorative sheet provided with a decoration such as a stained glass pattern or a quad glass pattern may be used.
  • the pressure-sensitive adhesive sheet of the present invention may be applied to labels, seals, and patches.
  • Various packaging containers especially containers such as PET bottles and glass bottles, are required to be easily separated from the label and the container at the time of disposal or waste collection / recycling. it can.
  • the pressure-sensitive adhesive sheet of the present invention may be applied to a writing surface forming sheet capable of simply providing a function of a whiteboard (white board) or a blackboard by sticking. As a result, various wall surfaces can be used as a whiteboard surface or the like, and the original state can be easily restored.
  • the pressure-sensitive adhesive sheet of the present invention can be used for posters and various advertisement displays. Thus, an advertisement or the like can be displayed on any wall surface, and the original state can be easily restored without adhesive residue on the adherend.
  • the pressure-sensitive adhesive sheet of the present invention can be used for a sun visor film or an anti-fog film that is attached to a window of a building or various vehicles to adjust the amount of transmitted light. As a result, the user can not only provide a sun visor or anti-fog function according to his / her preference, but also easily return to the original state.
  • the adhesive sheet of the present invention can be used for menus, price tags, bar codes, and the like. It is suitable for use such as changing the menu every month or temporarily changing the price tag or barcode.
  • the pressure-sensitive adhesive sheet of the present invention can be used for flaps (covers) of envelopes and boxes. As a result, the envelope can be easily sealed and can be opened and closed freely.
  • the pressure-sensitive adhesive sheet of the present invention may be used on the whole or a part of the tag. Since the pressure-sensitive adhesive sheet of the present invention can easily perform the formation of the adhesive force, it is possible to easily realize a stickable sticky note having the adhesive force according to the application. Further, the pressure-sensitive adhesive sheet of the present invention may be used for a destination display plate, a name tag, or the like as a usage pattern similar to a tag.
  • the pressure-sensitive adhesive sheet of the present invention is used for various functional sheets that exhibit various functions such as anti-reflection, electromagnetic wave shielding, optical filters, expansion or restriction of a viewing angle, and antistatic which are attached to the display surface of various display devices. Can be.
  • the various functional sheets may be attached at the time of manufacturing the display device at a factory or the like, or may be separately purchased and attached by a user of the display device.
  • the pressure-sensitive adhesive sheet of the present invention may be used as a curing tape or a masking tape used in various processes such as painting.
  • the pressure-sensitive adhesive sheet of the present invention may be used for a hook-and-loop fastener sheet, a hook-and-loop fastener tape, etc. used as a hook-and-loop fastener.
  • the pressure-sensitive adhesive sheet of the present invention may be used as a bandage stopper as a use form close to a hook-and-loop fastener.
  • the pressure-sensitive adhesive sheet of the present invention may be used for a sheet-shaped vehicle-mounted antenna, a vehicle-mounted sensor, or the like.
  • the adhesive sheet of the present invention may be used for forms such as delivery slips. Thus, for example, after the delivery is completed, the form can be peeled off and the delivery box can be reused.
  • the pressure-sensitive adhesive sheet of the present invention may be used for hanging objects requiring slip prevention, such as tablecloths and tiles. Since the pressure-sensitive adhesive sheet of the present invention is adsorbed (adhered) to the adherend by the adsorbing force (adhesive force) of the fine concave shape 13a, it can exhibit a sufficient anti-slip effect.
  • the pressure-sensitive adhesive sheet of the present invention is not limited to the use form in which the first sheet remains after pasting, as in the decorative sheet described above, but the form in which only the pressure-sensitive adhesive layer finally remains on the adherend, that is, a double-sided (pressure-sensitive) tape May be used.
  • a double-sided (pressure-sensitive) tape May be used.
  • both the first sheet and the second sheet disposed so as to sandwich the adhesive layer are formed of a peelable base sheet.
  • the decorative sheet (adhesive sheet) 1 of the present embodiment a plurality of concave shapes based on bubbles are formed on both surfaces of the adhesive layer 13. Accordingly, a decorative sheet in the form of a pressure-sensitive adhesive sheet can be obtained without heating the surface layer sheet, and can be easily manufactured without damaging the surface layer sheet.
  • the adhesive force of the adhesive layer 13 is based on the suction force of the concave shape 13a, the reworking property is high, and even if the attachment fails, it is easy to re-stretch and easy to use.
  • the concave shape 13a has a fine size and is provided in a large number, even if there is some unevenness on the surface of the adherend, it can exert an adhesive force (adsorbing force). Furthermore, since the phenomenon such as adhesive residue does not occur on the surface of the adherend after the decorative sheet 1 has been peeled off, it is not necessary to clean, and it can be re-applied as it is, thus improving workability. Good. Moreover, since the decorative sheet (pressure-sensitive adhesive sheet) 1 of the present embodiment can form the pressure-sensitive adhesive layer 13 without heating, the pressure-sensitive adhesive sheet can be formed by using various forms of the surface layer sheet, including the surface layer weak to heat. Can be configured.
  • the description of the pressure-sensitive adhesive sheet has been given by giving an example of a decorative sheet provided with a resin layer.
  • the present invention is not limited to this. .
  • the configuration of the surface layer sheet has been described by using an example in which the configuration includes the base material and the resin layer.
  • the present invention is not limited to this.
  • the surface sheet may be a single layer, or may have a more complicated configuration of three or more layers.
  • the material of the surface layer sheet may be made of paper, a thermoplastic resin, or the like, in addition to the examples given in the embodiments.

Abstract

Provided is a reworkable adhesive sheet. This adhesive sheet 1 comprises: a base material 11 and a resin layer 12 that serve as a surface sheet forming an obverse surface after affixation; an adhesive layer 13 layered on the reverse surface thereof; and a peelable base material sheet 14 layered on the side of the adhesive layer 13 opposite from the base material 11 and the resin layer 12, the adhesive layer 13 being provided with a plurality of recesses 13a in both surfaces thereof. The recesses 13a carry out an attachment function, thereby making it possible to produce adhesive force with respect to an object to be bonded and to ensure reworkability.

Description

粘着シートAdhesive sheet
　本発明は、粘着シートに関するものである。 The present invention relates to an adhesive sheet.
　化粧材を作製する際は、化粧シートに接着材を塗工し、木材や不燃材等にラミネート（貼り付け）を行うことが行われている。
　また、接着材の代わりに粘着材を使用することも可能であるが、従来の粘着材を用いてラミネートする形態の化粧シートは、再剥離して貼り直す等の再利用が困難であり、例えば、貼り付け時に皺が発生して化粧材作製に失敗すると化粧シートを剥いで廃棄したり、被着体を再利用する場合は被着体表面に残留する粘着剤層清掃したりする必要があった。このため、化粧シートを利用した化粧材の作製、及び、化粧シートを貼り付ける施工には、特別な設備が必要であったり、熟練した技術（者）が必要であったりして、難易度が高かった。そこで、化粧シートを利用しやすくするために、貼り付けを失敗した場合に剥がしてそのまま再度貼り付けを行える、所謂リワーク性を高めることが望まれていた。
　また、化粧シートに限らず、各種用途においても粘着性を有する粘着シートについて、リワーク性が高いことが望まれている。 When a decorative material is produced, an adhesive is applied to a decorative sheet and laminated (attached) to wood, non-combustible material, or the like.
Although it is also possible to use an adhesive instead of the adhesive, it is difficult to reuse a decorative sheet in the form of lamination using a conventional adhesive, such as re-peeling and re-attaching. If the preparation of a cosmetic material fails due to wrinkles during application, it is necessary to peel off the decorative sheet and discard it, or to reuse the adherend, it is necessary to clean the adhesive layer remaining on the adherend surface. Was. For this reason, the production of a decorative material using a decorative sheet and the work of attaching the decorative sheet require special equipment or a skilled technique (person). it was high. Therefore, in order to make it easier to use the decorative sheet, it has been desired to enhance so-called reworkability, in which when the pasting has failed, it can be peeled off and pasted again as it is.
In addition to the decorative sheet, it is desired that the pressure-sensitive adhesive sheet having high adhesiveness in various applications has high reworkability.
　一方、被着体側表面に多数の微小な吸盤群を有する粘着層からなるマイクロ吸盤膜に関する技術が、特許文献１に開示されている。このマイクロ吸盤膜は被着体との間で可逆的な貼り付け及び剥離が可能な為、斯かるマイクロ吸盤膜からなる粘着層を粘着シートに設けることができれば、リワーク性を備えた粘着シートとすることが可能と考えられる。しかし、特許文献１に開示されている組成物は、常温程度の温度でもマイクロ吸盤膜を作製可能とされているものの、塗布された組成物を常温で乾燥するとなると、非常に長い乾燥時間が必要となり、現実的には、加熱しながらの乾燥が必要であった。粘着シートには、意匠性を高めるための凹凸形状が賦型された樹脂層が設けられていたり、印刷層が設けられていたりする場合が多い。樹脂層や印刷層等を備える粘着シートでは、マイクロ吸盤膜の形成のために製造時に加熱されてしまうと、凹凸形状の形状が変化して甚だしい場合は凹凸形状が消失したり、或いは樹脂層や印刷層等がダメージを受けてしまうおそれがあり、粘着シートに上記組成物を塗布して利用することができなかった。 On the other hand, Patent Document 1 discloses a technique relating to a micro suction cup film formed of an adhesive layer having a large number of fine suction cup groups on an adherend side surface. Since this micro suction cup film can be reversibly attached and peeled to and from an adherend, if an adhesive layer comprising such a micro suction cup film can be provided on the pressure-sensitive adhesive sheet, a pressure-sensitive adhesive sheet having reworkability can be obtained. It is considered possible. However, although the composition disclosed in Patent Literature 1 is capable of producing a micro suction cup film even at a temperature of about room temperature, when the applied composition is dried at room temperature, a very long drying time is required. In practice, drying while heating was required. In many cases, a pressure-sensitive adhesive sheet is provided with a resin layer in which a concave-convex shape for improving design properties is provided, or a printed layer is provided. In a pressure-sensitive adhesive sheet provided with a resin layer, a printing layer, etc., if heated during manufacturing for the formation of a micro suction cup film, the shape of the uneven shape changes, and in severe cases, the uneven shape disappears, or the resin layer or There is a possibility that the printed layer or the like may be damaged, and the above-mentioned composition cannot be applied to the pressure-sensitive adhesive sheet and used.
特開２０１７－３６４０４号公報JP-A-2017-36404
　本発明の課題は、リワーク性を備えた粘着シートを提供することである。 課題 An object of the present invention is to provide a pressure-sensitive adhesive sheet having reworkability.
　本発明は、以下のような解決手段により、前記課題を解決する。なお、理解を容易にするために、本発明の実施形態に対応する符号を付して説明するが、これに限定されるものではない。 The present invention solves the above problems by the following means. In addition, in order to make it easy to understand, description is given with reference numerals corresponding to the embodiment of the present invention, but the present invention is not limited to this.
　第１の発明は、第１シート（１０）と、前記第１シート（１０）の裏面に積層された粘着層（１３）と、前記粘着層（１３）の前記第１シート（１０）とは反対側に積層された第２シート（１４）と、を備え、前記粘着層（１３）は、その両面に複数の凹形状（１３ａ）を備えている粘着シート（１）である。 In the first invention, a first sheet (10), an adhesive layer (13) laminated on a back surface of the first sheet (10), and the first sheet (10) of the adhesive layer (13) are: A second sheet (14) laminated on the opposite side, and the adhesive layer (13) is an adhesive sheet (1) having a plurality of concave shapes (13a) on both surfaces thereof.
　第２の発明は、第１の発明に記載の粘着シート（１）において、前記凹形状（１３ａ）は、前記粘着層（１３）の両面に均等に形成されていること、を特徴とする粘着シート（１）である。 According to a second invention, in the pressure-sensitive adhesive sheet (1) according to the first invention, the concave shape (13a) is uniformly formed on both surfaces of the pressure-sensitive adhesive layer (13). Sheet (1).
　第３の発明は、第２の発明に記載の粘着シート（１）において、前記第１シート（１０）側の面に開口する前記凹形状（１３ａ）の各開口部の直径の平均値をＤａｖｅ １とし、前記第２シート（１４）側に開口する前記凹形状（１３ａ）の各開口部の直径の平均値をＤａｖｅ ２としたときに、｜Ｄａｖｅ １－Ｄａｖｅ ２｜／Ｄａｖｅ ２≦０．５の関係を満たすこと、を特徴とする粘着シート（１）である。 According to a third aspect, in the pressure-sensitive adhesive sheet (1) according to the second aspect, the average value of the diameters of the respective openings of the concave shape (13a) opening on the surface on the first sheet (10) side is D. ave 1 and | D ave 1 −D ave 2 | / D, where D ave 2 is the average value of the diameters of the respective openings of the concave shape (13a) that opens toward the second sheet (14). The pressure-sensitive adhesive sheet (1), which satisfies a relationship of ave 2 ≦ 0.5.
　第４の発明は、第１の発明から第３の発明までのいずれかに記載の粘着シート（１）において、前記粘着層（１３）の層厚ｔは、２０μｍ≦ｔ≦４０μｍの範囲にあること、を特徴とする粘着シート（１）である。 A fourth invention is the pressure-sensitive adhesive sheet (1) according to any one of the first invention to the third invention, wherein the thickness t of the pressure-sensitive adhesive layer (13) is in a range of 20 μm ≦ t ≦ 40 μm. An adhesive sheet (1) characterized in that:
　第５の発明は、第１の発明から第４の発明までのいずれかに記載の粘着シート（１）において、前記粘着層（１３）は、液状の樹脂組成物（１３０）に気泡を含めて乾燥させたことにより前記気泡に基づく前記凹形状（１３ａ）が両面に複数形成されていること、を特徴とする粘着シート（１）である。 According to a fifth invention, in the pressure-sensitive adhesive sheet (1) according to any one of the first invention to the fourth invention, the pressure-sensitive adhesive layer (13) includes bubbles in the liquid resin composition (130). The pressure-sensitive adhesive sheet (1), wherein a plurality of the concave shapes (13a) based on the air bubbles are formed on both surfaces by drying.
　第６の発明は、第１の発明から第５の発明までのいずれかに記載の粘着シート（１）において、前記第１シート（１０）及び前記第２シート（１４）は、いずれも剥離性基材シート（１４）により構成されていること、を特徴とする粘着シート（１）である。 According to a sixth aspect, in the pressure-sensitive adhesive sheet (1) according to any one of the first to fifth aspects, the first sheet (10) and the second sheet (14) are both peelable. The pressure-sensitive adhesive sheet (1), comprising a base sheet (14).
　第７の発明は、第１の発明から第５の発明までのいずれかに記載の粘着シート（１）において、前記第１シート（１０）は、貼り付け後に表面となる表層シート（１０）であり、前記第２シート（１４）は、剥離性基材シート（１４）であること、を特徴とする粘着シート（１）である。 According to a seventh invention, in the pressure-sensitive adhesive sheet (1) according to any one of the first invention to the fifth invention, the first sheet (10) is a surface layer sheet (10) which becomes a surface after pasting. The second sheet (14) is a pressure-sensitive adhesive sheet (1), which is a peelable substrate sheet (14).
　第８の発明は、第７の発明に記載の粘着シート（１）において、前記粘着層（１３）は、前記剥離性基材シート（１４）に液状の樹脂組成物（１３０）を塗工して乾燥させた後に、前記表層シート（１０）がラミネートされて構成されていること、を特徴とする粘着シート（１）である。 According to an eighth invention, in the pressure-sensitive adhesive sheet (1) according to the seventh invention, the pressure-sensitive adhesive layer (13) is obtained by applying a liquid resin composition (130) to the peelable substrate sheet (14). After drying by drying, the surface layer sheet (10) is laminated to constitute the pressure-sensitive adhesive sheet (1).
　第９の発明は、第７の発明又は第８の発明に記載の粘着シート（１）において、前記表層シート（１０）は、紙、又は、熱可塑性樹脂により形成されていること、を特徴とする粘着シート（１）である。 According to a ninth aspect, in the pressure-sensitive adhesive sheet (1) according to the seventh or eighth aspect, the surface sheet (10) is formed of paper or a thermoplastic resin. It is a pressure-sensitive adhesive sheet (1).
　本発明によれば、リワーク性を備えた粘着シートを提供することができる。 According to the present invention, a pressure-sensitive adhesive sheet having reworkability can be provided.
本発明による化粧シートの第１実施形態を示す図である。It is a figure showing a 1st embodiment of a decorative sheet by the present invention. 化粧シート１の使用時の形態を順次示す図である。It is a figure which shows the form at the time of use of the decorative sheet 1 sequentially. 化粧シート１の製造装置を示す図である。It is a figure which shows the manufacturing apparatus of the decorative sheet 1. 化粧シート１の製造方法を説明する図である。It is a figure explaining the manufacturing method of decorative sheet 1. 実施例の化粧シート１の粘着層１３を被着体側の方向からみて拡大した写真である。It is the photograph which looked at the adhesion layer 13 of the decorative sheet 1 of the example from the direction of the adherend side and was enlarged. 実施例の化粧シート１の粘着層１３のシート面に直交する方向の断面で拡大した図である。It is the figure expanded in the cross section of the direction orthogonal to the sheet surface of the adhesive layer of the decorative sheet of the example. 実施例及び比較例の剥離力を示す図である。It is a figure which shows the peeling force of an Example and a comparative example. サンプル１の観察結果を示す図である。FIG. 9 is a diagram showing observation results of Sample 1. サンプル２の観察結果を示す図である。FIG. 9 is a diagram showing observation results of Sample 2. サンプル３の観察結果を示す図である。FIG. 9 is a diagram showing observation results of Sample 3. サンプル４の観察結果を示す図である。FIG. 9 is a diagram showing observation results of Sample 4.
　以下、本発明を実施するための最良の形態について図面等を参照して説明する。 Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings and the like.
（実施形態）
　図１は、本発明による化粧シートの第１実施形態を示す図である。
　なお、図１を含め、以下に示す各図は、模式的に示した図であり、各部の大きさ、形状は、理解を容易にするために、適宜誇張して示している。
　また、以下の説明では、具体的な数値、形状、材料等を示して説明を行うが、これらは、適宜変更することができる。
　本明細書において、板、シート、フィルム等の言葉を使用しているが、これらは、一般的な使い方として、厚さの厚い順に、板、シート、フィルムの順で使用されており、本明細書中でもそれに倣って使用している。しかし、このような使い分けには、技術的な意味は無いので、これらの文言は、適宜置き換えることができるものとする。
　なお、以下の説明では、粘着シートの一例として、第１シートが基材１１とラミネート後に観察可能に外部に露出する側の面、すなわち表面に凹凸形状（凹凸模様）を有する樹脂層１２を備えた表層シート１０からなる化粧シート１を挙げて説明するが、例えば基材１１上に樹脂層１２を備えずに印刷層のみを備えた各種粘着シートであってもよいし、基材１１上に樹脂層１２と印刷層とを備えていてもよく、或いは基材１１上に樹脂層１２を備えず基材表面に凹凸形状のみを備えていてもよい。化粧シート以外の形態の各種粘着シートにおいても、同様な構成を適用可能である。 (Embodiment)
FIG. 1 is a view showing a first embodiment of a decorative sheet according to the present invention.
In addition, each figure shown below including FIG. 1 is a diagram schematically shown, and the size and shape of each part are exaggerated as appropriate for easy understanding.
In the following description, specific numerical values, shapes, materials, and the like will be described, but these can be changed as appropriate.
In the present specification, the terms such as plate, sheet, and film are used, but these are generally used in the order of thickness, plate, sheet, and film in the order of thickness. I use it even in the book. However, since such use does not have a technical meaning, these terms can be appropriately replaced.
In the following description, as an example of the pressure-sensitive adhesive sheet, the first sheet is provided with a resin layer 12 having an irregular shape (irregular pattern) on the surface on the side exposed to the outside so as to be observable after lamination with the substrate 11. A description will be given with reference to the decorative sheet 1 composed of the surface layer sheet 10 described above. For example, various types of pressure-sensitive adhesive sheets having only the printing layer without the resin layer 12 on the base material 11 may be used. The resin layer 12 and the printing layer may be provided, or the resin layer 12 may not be provided on the base material 11 and only the unevenness may be provided on the base material surface. The same configuration can be applied to various types of pressure-sensitive adhesive sheets other than the decorative sheet.
　図１に図示する第１実施形態において、化粧シート１は、基材１１と樹脂層１２とを積層貼り合せしてなる第１シートと、粘着層１３と、剥離性基材シート１４とを備えている。
　基材１１は、樹脂層１２の形成に必要なベースとなる層である。基材１１は、例えば、紙を素材として用いてもよいし、樹脂シートを素材として用いてもよい。 In the first embodiment illustrated in FIG. 1, the decorative sheet 1 includes a first sheet formed by laminating and bonding a substrate 11 and a resin layer 12, an adhesive layer 13, and a peelable substrate sheet 14. ing.
The base material 11 is a layer serving as a base necessary for forming the resin layer 12. For the base material 11, for example, paper may be used as a material, or a resin sheet may be used as a material.
　樹脂層１２は、基材１１の表側の面に積層されており、複数の凹凸形状がその表面に形成されている。なお、理解を容易にするために、図１に示す樹脂層１２は、単層として示しているが、樹脂層１２は、異なる組成及び構造を備える複数の層により構成されていてもよい。樹脂層１２の凹凸形状は、例えば、木材の導管を表現したり、布地の表面凹凸形状を表現したり、石材の凹凸形状を表現したりしてもよく、その形態（模様）はどのような形態であってもよい。
　樹脂層１２を形成する樹脂としては、例えば、セルロース樹脂、ポリカーボネート樹脂、アクリル樹脂、スチレンブタジエン樹脂（スチレンブタジエンゴム）、ポリイソプレン、天然ゴム、エチレンプロピレンゴム（ＥＰＲ）、エチレンプロピレンジエン三元共重合体ゴム（ＥＰＤＭ）、ポリノルボルネン、ポリブタジエン、ニトリルゴム、クロロプレンゴム、ブチルゴム、ハロゲン化ブチルゴム、エチレン－酢酸ビニルゴム（ＥＶＡ）、ポリウレタン、シリコーンゴム、フッ素ゴム、エチレンアクリルゴム、ポリエステルエラストマー、エピクロルヒドリンゴム、多硫化ゴム、塩素化ポリエチレン、ポリエチレン、ポリスチレン、ポリイミド、ポリ塩化ビニル、ポリプロピレン；ポリオレフィン系、ポリウレタン系、ポリエステル系、ポリアミド系、及びポリスチレン系熱可塑性エラストマー等が挙げられる。なお、上記例示した樹脂以外を用いてもよい。 The resin layer 12 is laminated on the front surface of the base material 11, and a plurality of irregularities are formed on the surface. Although the resin layer 12 shown in FIG. 1 is shown as a single layer for easy understanding, the resin layer 12 may be composed of a plurality of layers having different compositions and structures. The uneven shape of the resin layer 12 may represent, for example, a pipe of wood, a surface unevenness of a fabric, or an uneven shape of a stone material. It may be in a form.
Examples of the resin forming the resin layer 12 include cellulose resin, polycarbonate resin, acrylic resin, styrene butadiene resin (styrene butadiene rubber), polyisoprene, natural rubber, ethylene propylene rubber (EPR), and ethylene propylene diene ternary copolymer. Combined rubber (EPDM), polynorbornene, polybutadiene, nitrile rubber, chloroprene rubber, butyl rubber, halogenated butyl rubber, ethylene-vinyl acetate rubber (EVA), polyurethane, silicone rubber, fluorine rubber, ethylene acrylic rubber, polyester elastomer, epichlorohydrin rubber, many Sulfurized rubber, chlorinated polyethylene, polyethylene, polystyrene, polyimide, polyvinyl chloride, polypropylene; polyolefin, polyurethane, polyester, poly Bromide system, and include polystyrene thermoplastic elastomer. In addition, you may use resins other than the resin illustrated above.
　また、図１で例示する本実施形態では、第１シート１０は、樹脂層１２上に基材１１が直接積層貼り合せされて構成されている例を挙げて説明したが、これに限らず、例えば、基材１１と樹脂層１２との間に、さらに別の層を設けてもよい。例えば、基材１１と樹脂層１２との間に、絵柄を印刷した印刷層（絵柄層）を設けて、樹脂層１２の全部又は一部を透明な樹脂により構成してもよい。 Further, in the embodiment illustrated in FIG. 1, the first sheet 10 has been described with an example in which the base material 11 is directly laminated and bonded on the resin layer 12, but the present invention is not limited thereto. For example, another layer may be provided between the base material 11 and the resin layer 12. For example, a printed layer (pattern layer) on which a pattern is printed may be provided between the base material 11 and the resin layer 12, and the whole or a part of the resin layer 12 may be made of a transparent resin.
　粘着層１３は、基材１１の樹脂層１２とは反対側（図１上では、下側となる面であり、これを基材１１の裏面側とも呼称する）の面に積層されており、被着体５０（図２参照）に対する粘着性を有する層である。粘着層１３は、その両面に開口した複数の凹形状１３ａを備えている。また、粘着層１３は、弾性を備えており、複数の凹形状１３ａがそれぞれ微細な吸盤として作用することから、様々な被着体５０に対して粘着力（吸着力）を発揮することができる（図２（ｃ）参照）。
　粘着層１３は、例えば、特許文献１（特開２０１７－３６４０４号公報）に開示されている液状の樹脂組成物（アクリルエマルジョン）を用いて後述する製造方法により形成される。粘着層１３の層厚ｔは、１μｍ以上、５００μｍ以下であることが望ましい。上記層厚範囲の下限値を下回ると、凹形状の形成が困難になったり、凹形状の大きさが小さくなりすぎて、粘着（吸着）特性が低下したりする。また、上記層厚範囲の上限値を越えると、化粧シートの柔軟性が低下して、作業性が悪くなる。
　さらに、粘着層１３の両面に凹形状１３ａを均等に設けるためには、粘着層１３の層厚ｔは、２０μｍ≦ｔ≦４０μｍの範囲とすることが望ましい。この点については、後述する。 The adhesive layer 13 is laminated on the surface of the substrate 11 opposite to the resin layer 12 (the lower surface in FIG. 1, which is also referred to as the back surface of the substrate 11). This is a layer having adhesiveness to the adherend 50 (see FIG. 2). The adhesive layer 13 has a plurality of concave shapes 13a opened on both surfaces thereof. Further, the adhesive layer 13 has elasticity, and since the plurality of concave shapes 13a each act as a fine suction cup, the adhesive layer 13 can exhibit adhesive force (adsorption force) to various adherends 50. (See FIG. 2 (c)).
The adhesive layer 13 is formed, for example, using a liquid resin composition (acryl emulsion) disclosed in Patent Document 1 (Japanese Patent Application Laid-Open No. 2017-36404) by a manufacturing method described later. The thickness t of the adhesive layer 13 is desirably 1 μm or more and 500 μm or less. When the thickness is below the lower limit of the above-mentioned layer thickness range, it is difficult to form a concave shape, or the size of the concave shape becomes too small, so that the adhesion (adsorption) characteristics deteriorate. On the other hand, when the thickness exceeds the upper limit of the above-mentioned thickness range, the flexibility of the decorative sheet is reduced and workability is deteriorated.
Further, in order to uniformly provide the concave shape 13a on both surfaces of the adhesive layer 13, the thickness t of the adhesive layer 13 is desirably in the range of 20 μm ≦ t ≦ 40 μm. This will be described later.
　粘着層１３の凹形状１３ａの大きさや密度は、後述する製造工程における各種条件を変更することにより、調整可能である。例えば、粘着層１３は、凹形状１３ａが含まれる程度を表す指標として、粘着層１３の密度を用いることができる。この粘着層１３の密度としては、特に限定されないが、例えば、０．１ｇ／ｃｍ３以上、０．６ｇ／ｃｍ３以下とすることができる。また、凹形状１３ａの大きさは、特に限定されないが、例えば、１μｍ以上、３００μｍ以下とすることができる。 The size and density of the concave shape 13a of the adhesive layer 13 can be adjusted by changing various conditions in a manufacturing process described later. For example, the density of the adhesive layer 13 can be used as an index indicating the degree to which the concave shape 13a is included in the adhesive layer 13. The density of the adhesive layer 13 is not particularly limited, but may be, for example, 0.1 g / cm 3 or more and 0.6 g / cm 3 or less. The size of the concave shape 13a is not particularly limited, but may be, for example, 1 μm or more and 300 μm or less.
　剥離性基材シートである第２シート１４は、粘着層１３の基材１１とは反対側（図１上では、下側となる面であり、これを粘着層１３の裏面側とも呼称する）に積層されている。剥離性基材シート１４は、化粧シート１を使用するまでの間の取扱性を考慮して設けられるものであり、化粧シート１の使用時、すなわち被着体５０上に化粧シート１を貼り合せる際に剥離される。剥離性基材シート１４としては、従来公知の離型フィルム、セパレート紙、セパレートフィルム、セパ紙、剥離フィルム、剥離紙等の各種形態のものを適宜使用できる。例えば、上質紙、コート紙、含浸紙、プラスチックフィルム等の片面又は両面に離型層を形成したものを用いてもよい。離型層としては、離型性を有する材料であれば、特に限定されないが、例えば、シリコーン樹脂、有機樹脂変性シリコーン樹脂、フッ素樹脂、アミノアルキド樹脂、メラミン系樹脂、アクリル系樹脂、ポリエステル樹脂等を挙げることができる。これらの樹脂は、エマルジョン型、溶剤型又は無溶剤型のいずれもが使用できる。離型層を備えた離型フィルムを用いる場合には、例えば、シリコーン離型タイプのＰＥＴ（ポリエチレンテレフタレート）フィルム、未処理ＰＥＴフィルム、ＰＰフィルム、シリコーン離型タイプの紙等を用いることができる。 The second sheet 14, which is a peelable substrate sheet, is on the opposite side of the adhesive layer 13 from the substrate 11 (the lower surface in FIG. 1, which is also referred to as the back surface of the adhesive layer 13). Are laminated. The peelable base sheet 14 is provided in consideration of the handling property until the decorative sheet 1 is used, and the decorative sheet 1 is attached to the adherend 50 when the decorative sheet 1 is used, that is, on the adherend 50. When peeled off. As the releasable base sheet 14, various types of conventionally known release films, separate papers, separate films, separate papers, release films, release papers and the like can be used as appropriate. For example, high quality paper, coated paper, impregnated paper, plastic film or the like having a release layer formed on one or both sides may be used. The release layer is not particularly limited as long as it has a release property, and examples thereof include a silicone resin, an organic resin-modified silicone resin, a fluorine resin, an aminoalkyd resin, a melamine resin, an acrylic resin, and a polyester resin. Can be mentioned. These resins can be used in any of an emulsion type, a solvent type and a solventless type. When a release film having a release layer is used, for example, a silicone release type PET (polyethylene terephthalate) film, an untreated PET film, a PP film, a silicone release type paper, or the like can be used.
　剥離性基材シート１４の厚さは、例えば、１０μｍ以上、１００μｍ以下とすることが望ましく、２０μｍ以上、６０μｍ以下とすることがさらに望ましい。上記層厚範囲の下限値を下回ると、コシがなく、剥離しづらくなる。また、上記層厚範囲の上限値を越えると、コシが強すぎて貼り付け時の作業性が低下するからである。
　また、剥離性基材シート１４としては、市販のものを使用してもよく、例えば、片面にシリコーン系剥離剤による易剥離処理が施されている厚さ３８μｍのポリエステルフィルム（三井化学東セロ株式会社製、商品名：ＳＰ－ＰＥＴ－０１）等が挙げられる。 The thickness of the releasable base material sheet 14 is preferably, for example, not less than 10 μm and not more than 100 μm, more preferably not less than 20 μm and not more than 60 μm. When the thickness is below the lower limit of the above-mentioned layer thickness range, there is no stiffness and it becomes difficult to peel off. On the other hand, when the thickness exceeds the upper limit of the above-mentioned thickness range, the stiffness is too strong and the workability at the time of bonding is reduced.
As the releasable substrate sheet 14, a commercially available product may be used. For example, a 38 μm-thick polyester film (Mitsui Chemicals Tosello Co., Ltd.) having one surface subjected to an easy-peeling treatment with a silicone-based releasing agent may be used. And trade name: SP-PET-01).
　図２は、化粧シート１の使用時の形態を順次示す図である。
　上述した化粧シート１は、図２（ａ）に示すように、剥離性基材シート１４を備えている。化粧シート１を被着体５０に貼り付けるときには、剥離性基材シート１４を剥離する（図２（ｂ））。そして、露出した粘着層１３を被着体５０に貼り付けて、その表面に適度な圧力を加えることにより、粘着層の露出面に多数存在する凹形状１３ａが弾性変形することにより従来のマイクロ吸盤と同様な作用によって被着体５０に対して吸着（粘着）することとなる（図２（ｃ））。
　すなわち、凹形状１３ａの周囲の弾性変形によって、凹形状１３ａには、変形状態から元の形状に戻ろうとする力が働く。この力により、凹形状１３ａ内の密閉空間が負圧となって、被着体５０への吸着作用が生じる。なお、凹形状１３ａ単体での吸着力は、弱いものであるが、多数の凹形状１３ａが形成されているので、全体としては必要な吸着力を確保できる。また、粘着層１３の作製時に、凹形状１３ａが含まれる量を、例えば、密度をパラメータとして調整すれば、粘着層１３の粘着力（吸着力）を調整可能である。 FIG. 2: is a figure which shows the form at the time of use of the decorative sheet 1 sequentially.
The decorative sheet 1 described above includes a releasable base sheet 14 as shown in FIG. When attaching the decorative sheet 1 to the adherend 50, the peelable substrate sheet 14 is peeled off (FIG. 2B). Then, the exposed pressure-sensitive adhesive layer 13 is attached to the adherend 50, and by applying an appropriate pressure to the surface thereof, a large number of concave shapes 13a existing on the exposed surface of the pressure-sensitive adhesive layer are elastically deformed. By the same action as described above, it is adsorbed (adhered) to the adherend 50 (FIG. 2C).
That is, due to the elastic deformation around the concave shape 13a, a force is applied to the concave shape 13a to return to the original shape from the deformed state. Due to this force, the sealed space in the concave shape 13a becomes a negative pressure, and an adsorption action to the adherend 50 occurs. Although the suction force of the concave shape 13a alone is weak, a necessary suction force can be secured as a whole because a large number of the concave shapes 13a are formed. In addition, when the adhesive layer 13 is manufactured, if the amount of the concave shape 13a is adjusted, for example, using the density as a parameter, the adhesive force (adsorption force) of the adhesive layer 13 can be adjusted.
　次に、化粧シート１の製造方法について説明する。
　図３は、化粧シート１の製造装置を示す図である。
　図４は、化粧シート１の製造方法を説明する図である。 Next, a method for manufacturing the decorative sheet 1 will be described.
FIG. 3 is a diagram illustrating a manufacturing device of the decorative sheet 1.
FIG. 4 is a diagram illustrating a method for manufacturing the decorative sheet 1.
　化粧シート１の製造を行うためには、先ず、粘着層１３を形成するための特許文献１に開示されているアクリルエマルジョンの組成物を攪拌機３０１に入れ、この組成物中に配管３０２経由で窒素ガスを混合しながら攪拌を行い、組成物中に気泡Ｂを含め、気泡含有組成物１３０を作製する（図中のＰ１：泡立て工程）。 In order to manufacture the decorative sheet 1, first, a composition of an acrylic emulsion disclosed in Patent Document 1 for forming the adhesive layer 13 is put into a stirrer 301, and the composition is mixed with nitrogen via a pipe 302. Stirring is performed while mixing the gas to prepare the bubble-containing composition 130 including the bubble B in the composition (P1: foaming step in the figure).
　次に、剥離性基材シート（第２シート）１４上に気泡含有組成物１３０を塗工裝置３０３にて塗工する（図中のＰ２：塗工工程）。塗工工程では、例えば、塗工裝置（塗工ユニット）としてコンマコータを用いることができるが、その他の公知の塗工手法を用いてもよい。 (4) Next, the bubble-containing composition 130 is applied on the releasable base material sheet (second sheet) 14 by the coating apparatus 303 (P2 in the figure: coating step). In the coating step, for example, a comma coater can be used as a coating device (coating unit), but other known coating methods may be used.
　剥離性基材シート１４上に気泡含有組成物１３０を塗工したら、気泡含有組成物１３０を乾燥装置３０４内に気泡含有組成物１３０を塗工した剥離性基材シート１４を通過させることにより加熱しながら乾燥させて粘着層１３を形成する（図中のＰ３：乾燥工程）。乾燥工程では、例えば、内部の雰囲気温度を６０℃～１４０℃程度の乾燥炉を用いることができる。乾燥時間としては、例えば、３０秒～１０分程度を例示することができる。また、乾燥工程では、気泡含有組成物１３０に対して所定温度の高温空気を送風を行いながら乾燥を促進してもよい。また、赤外線輻射、誘電加熱等の他の乾燥方式を採用することもできる。乾燥工程を行うことにより、気泡含有組成物１３０の両面に凹形状１３ａが形成されて、粘着層１３が形成される。この凹形状１３ａは、気泡含有組成物１３０中に含まれていた気泡が破泡して気泡の形状の一部が残ることにより形成される。ここで、気泡含有組成物１３０の硬化が不十分な状態で気泡が破泡すると凹形状１３ａが残りにくくなる。一方、気泡が破泡する前に気泡含有組成物１３０が硬化してしまうと、凹形状１３ａが形成されないおそれがある。よって、ある程度、気泡含有組成物１３０の硬化が進んだ状態で破泡が行われる条件で乾燥工程が行われることが望ましい。したがって、乾燥工程における温度や送風量が、凹形状１３ａの状態に大きく影響を与える。 After the bubble-containing composition 130 is applied on the peelable substrate sheet 14, the bubble-containing composition 130 is heated by passing the bubble-containing composition 130 through the peelable substrate sheet 14 coated with the bubble-containing composition 130 in the drying device 304. While drying, the adhesive layer 13 is formed (P3 in the figure: drying step). In the drying step, for example, a drying furnace having an internal atmosphere temperature of about 60 ° C. to 140 ° C. can be used. The drying time may be, for example, about 30 seconds to 10 minutes. In the drying step, drying may be promoted while blowing high-temperature air at a predetermined temperature to the bubble-containing composition 130. Further, other drying methods such as infrared radiation and dielectric heating can be adopted. By performing the drying step, the concave shape 13a is formed on both surfaces of the bubble-containing composition 130, and the adhesive layer 13 is formed. This concave shape 13a is formed by breaking bubbles contained in the bubble-containing composition 130 and leaving a part of the bubble shape. Here, if the bubbles break in a state where the curing of the bubble-containing composition 130 is insufficient, the concave shape 13a hardly remains. On the other hand, if the bubble-containing composition 130 is cured before the bubbles break, the concave shape 13a may not be formed. Therefore, it is desirable that the drying step is performed under the condition that the foaming is performed in a state where the curing of the bubble-containing composition 130 has progressed to some extent. Therefore, the temperature and the amount of air blow in the drying process greatly affect the state of the concave shape 13a.
　乾燥工程により剥離性基材シート１４上に粘着層１３を形成した後、ラミネート裝置３０５を用いて別途用意した基材１１及び樹脂層１２を備える表層シート（第１シート）１０を粘着層１３と接合させる（図中のＰ４：ラミネート工程）。このラミネート工程では、粘着層１３の凹形状１３ａによる吸着力（粘着力）によってラミネートを行うので、加熱が不要であり、また、僅かな加圧力だけで接合が可能である。よって、表層シートである基材１１及び樹脂層１２にダメージを与えることがない。 After forming the adhesive layer 13 on the releasable substrate sheet 14 by a drying process, the surface layer sheet (first sheet) 10 having the substrate 11 and the resin layer 12 separately prepared using the laminating apparatus 305 is attached to the adhesive layer 13. Bonding (P4 in the figure: laminating step). In the laminating step, since the lamination is performed by the attraction force (adhesion force) of the concave shape 13a of the adhesive layer 13, heating is not required, and the bonding can be performed with only a small pressing force. Therefore, there is no damage to the base material 11 and the resin layer 12 which are the surface sheets.
　上記ラミネート工程が完了すれば、化粧シート１が完成する。
　以上のように、本実施形態の化粧シート１の製造では、表層シートに粘着層１３形成時の熱によるダメージを与えることなく、化粧シート１を効率よく製造可能である。なお、化粧シートは、その後、ロール状に巻き取ってもよいし、必要なサイズに裁断されてもよい。 When the laminating step is completed, the decorative sheet 1 is completed.
As described above, in the production of the decorative sheet 1 of the present embodiment, the decorative sheet 1 can be efficiently produced without damaging the surface sheet by heat when the adhesive layer 13 is formed. The decorative sheet may then be wound into a roll or cut into a required size.
　次に、本実施形態の化粧シート１を実際に作製した例を示し、比較例と比較した結果を説明する。
　実施例の化粧シート１では、剥離性基材シート１４に離型性を備えた２軸延伸ＰＥＴフィルム上に、２００μｍのクリアランスを有するコンマコータを用いて泡立て工程済みの気泡含有組成物１３０を塗布した。これを１００℃の乾燥路内で１分間乾燥を行って粘着層１３を形成し、表層シートをラミネートして化粧シート１を得た。なお、この場合の粘着層１３の密度は、０．３９ｇ／ｃｍ３であり、厚さ５０μｍであった。
　図５は、実施例の化粧シート１の粘着層１３を被着体側の方向からみて拡大した写真である。
　図６は、実施例の化粧シート１の粘着層１３のシート面に直交する方向の断面で拡大した図である。
　図５及び図６に示すように、粘着層１３には、多数の凹形状１３ａが形成されていることが確認できる。 Next, an example in which the decorative sheet 1 of the present embodiment is actually produced will be shown, and results of comparison with a comparative example will be described.
In the decorative sheet 1 of the example, the bubble-containing composition 130 having been subjected to the foaming step was applied to the peelable substrate sheet 14 on a biaxially stretched PET film having releasability using a comma coater having a clearance of 200 μm. . This was dried in a drying path at 100 ° C. for 1 minute to form an adhesive layer 13, and a surface sheet was laminated to obtain a decorative sheet 1. In this case, the density of the adhesive layer 13 was 0.39 g / cm 3 and the thickness was 50 μm.
FIG. 5 is an enlarged photograph of the pressure-sensitive adhesive layer 13 of the decorative sheet 1 of the example viewed from the direction of the adherend.
FIG. 6: is the figure expanded by the cross section of the direction orthogonal to the sheet surface of the adhesive layer 13 of the decorative sheet 1 of an Example.
As shown in FIGS. 5 and 6, it can be confirmed that the adhesive layer 13 has a large number of concave shapes 13a.
　比較例１として、泡だけ工程を行わない他は、上記実施例と同様にして作製した化粧シートを作製した。作製後の粘着層の密度は、０．８７ｇ／ｃｍ３であり、厚さ１００μｍであった。
　比較例２として、アクリル樹脂である綜研化学社製：ＳＫ２０９４を用いて粘着層を作製した化粧シート（アクリル粘着Ａタイプとする）を用意した。
　比較例３として、アクリル樹脂である綜研化学社製：ＳＫ１５０２Ｃを用いて粘着層を作製した化粧シート（アクリル粘着Ｂタイプとする）を用意した。 As Comparative Example 1, a decorative sheet was prepared in the same manner as in the above example, except that the step of only foam was not performed. The density of the pressure-sensitive adhesive layer after preparation was 0.87 g / cm 3 , and the thickness was 100 μm.
As Comparative Example 2, a decorative sheet (acrylic adhesive A type) in which an adhesive layer was prepared using an acrylic resin, SK2094 manufactured by Soken Chemical Co., Ltd., was prepared.
As Comparative Example 3, a decorative sheet (acrylic adhesive B type) in which an adhesive layer was prepared using an acrylic resin, SK1502C manufactured by Soken Chemical Co., Ltd., was prepared.
　以上の４種類の化粧シートを用意し、剥離力について比較した。
　図７は、実施例及び比較例の剥離力を示す図である。
　図７中の剥離力は、引っ張り試験機を用いて、引っ張り速度３００ｍｍ／ｍｉｎで１８０°剥離を行って、そのときの剥離力を測定した結果である。また、剥離力の測定は、貼り付け直後（０時間）と、貼り付け後１０００時間経過とについて行った。 The above four types of decorative sheets were prepared, and the peeling force was compared.
FIG. 7 is a diagram illustrating the peeling force of the example and the comparative example.
The peeling force in FIG. 7 is the result of measuring 180 ° peeling at a pulling speed of 300 mm / min using a tensile tester and measuring the peeling force at that time. The peeling force was measured immediately after the application (0 hour) and after 1000 hours from the application.
　実施例では、貼り付け直後及び１０００時間経過後の双方において、比較的小さな剥離力で剥離できることがわかる。この程度の剥離力であれば、自然に剥がれてしまうことはなく、かつ、剥がそうとして力を加えれば簡単に剥がすことが可能である。しかも、凹形状１３ａによる吸着であることから、剥離後に被着体５０表面に粘着層１３の残留が無く、また、粘着層１３自体の粘着力（剥離力）も実質上の変化は無く、再貼り付け可能であった。
　比較例１は、小片であれば比較的小さな剥離力で剥離できるが、大サイズの場合は剥離にある程度の力が必要であった。また、剥離後には被着体表面に粘着層の残留が見られ、完全な再貼り付けは不可能であった。
　比較例２は、大サイズの場合は剥離にある程度の力が必要であり、貼り付け直後であれば、剥がすことは可能であるが、１０００時間経過後では、剥離力が大幅に上昇してしまっており、手作業では剥離が困難であったり、無理に剥がすと表層シートが破損したりするおそれがある状態になっていた。
　比較例３は、貼り付け直後から剥離力が大きすぎて、手作業では剥離が困難であったり、無理に剥がすと表層シートが破損したりするおそれがある状態になっていた。
　また、比較例２及び比較例３のいずれも、剥離後は、被着体に粘着材が一部残ってしまったり、粘着力の低下があったりして、再貼り付けには適していなかった。 In the examples, it can be seen that the peeling can be performed with a relatively small peeling force both immediately after the application and after the lapse of 1000 hours. With this level of peeling force, there is no spontaneous peeling, and it is possible to easily peel off by applying a force to peel. Moreover, since the suction is performed by the concave shape 13a, the adhesive layer 13 does not remain on the surface of the adherend 50 after peeling, and the adhesive force (peeling force) of the adhesive layer 13 itself does not substantially change. Pasting was possible.
In Comparative Example 1, a small piece can be peeled with a relatively small peeling force, but a large size requires a certain force for peeling. Further, after peeling, a residual adhesive layer was observed on the adherend surface, and complete reattachment was impossible.
Comparative Example 2 requires a certain amount of force for peeling in the case of a large size, and can be peeled immediately after pasting, but after 1000 hours, the peeling force increases significantly. In such a case, it was difficult to peel off the sheet by hand, or there was a risk that the surface sheet would be damaged if the sheet was forcibly peeled off.
In Comparative Example 3, the peeling force was too large immediately after the application, and the peeling was difficult by manual work, or the surface layer sheet might be damaged if it was forcibly peeled off.
Also, in each of Comparative Examples 2 and 3, after peeling, a part of the adhesive material remained on the adherend, or the adhesive strength was reduced, so that it was not suitable for re-attaching. .
（粘着層１３の凹形状１３ａについて検証実験）
　上述したように、本発明において、粘着層１３の凹形状１３ａが、粘着力に大きな影響を与える。凹形状１３ａが粘着層１３の両面に均等に設けられていないと、粘着層の一方の面が他方の面に比べて粘着力（吸着力）が低下、又は、増加してしまうおそれがある。また、凹形状１３ａが粘着層１３の両面に均等に設けられることにより、粘着層１３の物理的性質も均質になり、表層シート（第１シート）と剥離性基材シート（第２シート）、又は、表層シート（第１シート）と被着体との両者に対する十分な粘着力及び被着体との再剥離性の発現の上でも好ましい。 (Verification experiment on concave shape 13a of adhesive layer 13)
As described above, in the present invention, the concave shape 13a of the adhesive layer 13 has a large effect on the adhesive strength. If the concave shape 13a is not evenly provided on both surfaces of the adhesive layer 13, there is a possibility that one surface of the adhesive layer has reduced or increased adhesive force (adhesive force) as compared with the other surface. In addition, since the concave shape 13a is uniformly provided on both surfaces of the adhesive layer 13, the physical properties of the adhesive layer 13 are also uniform, and the surface sheet (first sheet) and the peelable base sheet (second sheet), Alternatively, it is preferable in terms of sufficient adhesion to both the surface layer sheet (first sheet) and the adherend and removability from the adherend.
　凹形状１３ａを粘着層１３の両面に均等に設けるためには、粘着層１３の塗布量（層厚ｔ）の管理が重要である。この点、特許文献１（特開２０１７－３６４０４号公報）においては、何ら考慮されておらず、単にマイクロ吸盤が形成されていればよいとされている。特許文献１では、ＷＥＴ膜厚８００μｍとして形成した実施例１の断面写真である図２（特許文献１の図２）において、マイクロ吸盤を有する面として示されている部分には、微細な吸盤構造が形成されているものの、ガラス基板から剥離した面として示されている部分には、先の微細な吸盤構造とは比べものにならない程巨大な気泡と思われる構成が確認できる。すなわち、特許文献１の構成では、粘着層の一方の面にはマイクロ吸盤（本実施形態における凹形状１３ａに相当）が形成されているが、他方の面には、マイクロ吸盤（凹形状１３ａ）が略形成されていない。 In order to uniformly provide the concave shape 13a on both surfaces of the adhesive layer 13, it is important to control the application amount (layer thickness t) of the adhesive layer 13. In this regard, Patent Document 1 (Japanese Patent Application Laid-Open No. 2017-36404) does not consider anything at all, and states that it is only necessary to form a micro sucker. In Patent Document 1, in FIG. 2 (FIG. 2 of Patent Document 1) which is a cross-sectional photograph of Example 1 formed with a WET film thickness of 800 μm, a portion shown as a surface having a micro suction cup has a fine suction cup structure. However, in the portion shown as a surface peeled from the glass substrate, a structure that seems to be a huge bubble that is incomparable with the fine suction cup structure can be confirmed. That is, in the configuration of Patent Document 1, a micro suction cup (corresponding to the concave shape 13a in the present embodiment) is formed on one surface of the adhesive layer, but the micro suction cup (concave shape 13a) is formed on the other surface. Are not substantially formed.
　この点を本件出願人においても、検証実験を行なった。
　検証実験として、４種類の粘着層のサンプルを作製し、その両面の凹形状１３ａをＳＥＭで観察した。サンプルは、以下の４種類である。
　サンプル１：粘着層の層厚ｔ＝２５μｍ
　サンプル２：粘着層の層厚ｔ＝３０μｍ
　サンプル３：粘着層の層厚ｔ＝３５μｍ
　サンプル４：粘着層の層厚ｔ≒２０００μｍ
　なお、上記サンプルの層厚は、乾燥後の層厚である。また、サンプル１～３については、コーターを用いてガラス面に発泡処理後の気泡含有組成物を塗工し、１００度の乾燥炉を用いて乾燥処理を行なった。サンプル４については、ガラス面への滴下塗布とし、常温下の自然乾燥とした。なお、サンプル４について乾燥条件を変えたのは、特許文献１における常温乾燥で十分であるとの記載についても検証するためである。また、いずれのサンプルも、発泡処理後の粘着層の密度は、０．４ｇ／ｃｍ３とした。 In this regard, the applicant also conducted a verification experiment.
As a verification experiment, four types of samples of the adhesive layer were prepared, and the concave shapes 13a on both surfaces thereof were observed by SEM. The samples are the following four types.
Sample 1: adhesive layer thickness t = 25 μm
Sample 2: adhesive layer thickness t = 30 μm
Sample 3: adhesive layer thickness t = 35 μm
Sample 4: adhesive layer thickness t 層 2000 μm
In addition, the layer thickness of the sample is a layer thickness after drying. For Samples 1 to 3, the foam-containing composition after the foaming treatment was applied to the glass surface using a coater, and the drying treatment was performed using a drying oven at 100 degrees. Sample 4 was applied dropwise onto the glass surface and air-dried at room temperature. The reason for changing the drying conditions for Sample 4 is also to verify the description in Patent Document 1 that normal temperature drying is sufficient. In each sample, the density of the pressure-sensitive adhesive layer after the foaming treatment was 0.4 g / cm 3 .
　図８は、サンプル１の観察結果を示す図である。
　図９は、サンプル２の観察結果を示す図である。
　図１０は、サンプル３の観察結果を示す図である。
　図１１は、サンプル４の観察結果を示す図である。
　図８から図９のように、粘着層の層厚ｔを管理したサンプル１からサンプル３については、微細な凹形状１３ａが両面に均等に形成されていることが確認できた。
　これに対して、図１１に示す膜厚が厚いサンプル４では、乾燥面とガラス側面とで凹形状１３ａの大きさに極端な差異が認められ、特許文献１の図２と同様な結果が得られた。
　よって、粘着層１３の両面に凹形状１３ａを均等に設けるためには、粘着層１３の層厚ｔは、２０μｍ≦ｔ≦４０μｍの範囲とすることが望ましいと判断できる。 FIG. 8 is a diagram showing the observation results of Sample 1.
FIG. 9 is a diagram showing the observation results of Sample 2.
FIG. 10 is a diagram showing the observation results of Sample 3.
FIG. 11 is a diagram showing the observation results of Sample 4.
As shown in FIGS. 8 to 9, it was confirmed that the fine concave portions 13a were uniformly formed on both surfaces of the samples 1 to 3 in which the thickness t of the adhesive layer was controlled.
On the other hand, in the sample 4 having a large film thickness shown in FIG. 11, an extreme difference was observed in the size of the concave shape 13a between the dry surface and the glass side surface, and the same result as FIG. Was done.
Therefore, it can be determined that the thickness t of the adhesive layer 13 is desirably in the range of 20 μm ≦ t ≦ 40 μm in order to uniformly provide the concave shapes 13 a on both surfaces of the adhesive layer 13.
　ここで、この凹形状１３ａが粘着層１３の両面に均等に設けられている状態について、より詳しくは、以下に示すような関係を満たすことが望ましい。
　表層シート（第１シート）側の面に開口する凹形状１３ａの各開口部の直径の平均値をＤａｖｅ １とし、剥離性基材シート（第２シート）側に開口する凹形状１３ａの各開口部の直径の平均値をＤａｖｅ ２としたときに、
　｜Ｄａｖｅ １－Ｄａｖｅ ２｜／Ｄａｖｅ ２≦０．５
　の関係を満たすことが望ましい。
　また、
　｜Ｄａｖｅ １－Ｄａｖｅ ２｜／Ｄａｖｅ ２≦０．２５
　の関係を満たすことがさらに望ましい。
　これらの関係を満たすことにより、粘着層の両面における粘着力の差異を少なくすることができ、また、表層シート（第１シート）と剥離性基材シート（第２シート）、又は、表層シート（第１シート）と被着体との両者に対する十分な粘着力及び被着体との再剥離性を良好に発現させることができる。
　なお、各開口部の直径の平均値とは、全ての開口部の平均を求めることは現実的には不可能であるので、ここでは、１５００μｍ×１１００μｍの観察範囲内において、直径が大きい開口部から順に３個の開口部について直径の計測を行ない、その平均値とした。 Here, it is desirable that the state in which the concave shapes 13a are evenly provided on both surfaces of the adhesive layer 13 more specifically satisfy the following relationship.
The average value of the diameter of each opening of the concave shape 13a opening on the surface on the surface layer sheet (first sheet) side is set to Dave 1, and each of the concave shapes 13a opening on the releasable base material sheet (second sheet) side. the mean value of the diameters of the openings when the D ave 2,
| D ave 1 -D ave 2 | / D ave 2 ≦ 0.5
It is desirable to satisfy the relationship
Also,
| D ave 1 −D ave 2 | / D ave 2 ≦ 0.25
It is more desirable to satisfy the following relationship.
By satisfying these relationships, it is possible to reduce the difference in the adhesive strength between the two surfaces of the adhesive layer, and furthermore, the surface sheet (first sheet) and the peelable substrate sheet (second sheet), or the surface sheet ( A sufficient adhesive force to both the first sheet) and the adherend and removability from the adherend can be exhibited well.
In addition, the average value of the diameters of the respective apertures is not practically possible to obtain the average of all the apertures. Therefore, in this case, the aperture having the larger diameter within the observation range of 1500 μm × 1100 μm is used. The diameter of each of the three openings was measured in order from, and the average value was obtained.
　ここで、図８から図１１のサンプルについて、開口部の計測を行ない、｜Ｄａｖｅ １－Ｄａｖｅ ２｜／Ｄａｖｅ ２　を求めたところ、サンプル１：０．０４、サンプル２：０．０６、サンプル３：０．１２、サンプル４：０．６９であった。 Here, the openings of the samples of FIGS. 8 to 11 were measured, and | D ave 1 −D ave 2 | / D ave 2 was obtained. As a result, sample 1: 0.04 and sample 2: 0.06 , Sample 3: 0.12 and sample 4: 0.69.
（適用例）
　以上の説明では、本発明の粘着シートの形態として、各種の被着体表面に所望の意匠外観を附与する化粧シートを例に挙げて説明した。ここで、化粧シートには、より細かく分類すると様々な用途があり、本発明の粘着シートは、これら様々な用途において適用可能である。さらに、化粧シートに限らず、本発明の粘着シートは、様々な用途に適用可能である。以下、本発明の粘着シートを好適に適用可能な具体例を例示する。 (Application example)
In the above description, as an embodiment of the pressure-sensitive adhesive sheet of the present invention, a decorative sheet that imparts a desired design appearance to various adherend surfaces has been described as an example. Here, the decorative sheet has various uses when classified more finely, and the pressure-sensitive adhesive sheet of the present invention can be applied in these various uses. Further, the pressure-sensitive adhesive sheet of the present invention is not limited to a decorative sheet and can be applied to various uses. Hereinafter, specific examples to which the pressure-sensitive adhesive sheet of the present invention can be suitably applied will be described.
（床用化粧シート）
　本発明の粘着シートは、床用化粧シートとして適用することができる。より具体的には、例えば、クッションフロアに適用したり、尺角タイルに適用したり、階段の滑り止めシートに適用したり、絨緞に適用したり、或いはバスマット（浴室床用敷物）やキッチンマット（厨房床用敷物）に適用することができる。
　本発明の粘着シートの剥離容易性及び再貼り付け可能な特性により、家屋建築時の作業性を高めることができるだけではなく、家屋の建築後における居住者自身による内装の化粧直し作業、すなわち、簡易リフォームを容易に施工することが可能となる。また、これら床用化粧シートは、多数の微細な凹形状１３ａによる吸着力（粘着力）によって被着体へ吸着（粘着）するので、簡単に剥離可能であり、糊残りもなく、被着体の破損も防げることから、床用化粧シートの貼り付け前の状態へ簡単に復元することも可能である。 (Decorative sheet for floor)
The pressure-sensitive adhesive sheet of the present invention can be applied as a decorative sheet for floors. More specifically, for example, it can be applied to cushion floors, to square tiles, to non-slip sheets on stairs, to carpets, or to bath mats (bath floor coverings) or kitchen mats. (Kitchen floor rugs).
Due to the easily peelable and re-attachable properties of the pressure-sensitive adhesive sheet of the present invention, not only can the workability at the time of building the house be improved, but also the interior redressing work by the resident himself after the building of the house, that is, a simple reform Can be easily constructed. Further, since these floor decorative sheets are adsorbed (adhered) to the adherend by the adsorbing force (adhesive force) due to the numerous fine concave shapes 13a, they can be easily peeled off, there is no adhesive residue, and the adherend is not adhered. Since it is possible to prevent damage to the floor, it is possible to easily restore the state before the decorative sheet for floor is attached.
（壁用化粧シート）
　本発明の粘着シートは、壁用化粧シートとして適用することができる。より具体的には、例えば、壁紙、不燃ボード、石膏ボード、ケイ酸カルシウム板、コンクリート、アルミニウム板等に適用することができる。
　本発明の粘着シートの剥離容易性及び再貼り付け可能な特性により、家屋建築時の作業性を高めることができるだけではなく、家屋の建築後における居住者自身による内装の化粧直し作業、すなわち、簡易リフォームを容易に施工することが可能となる。特に、従来の壁紙のように水糊を用いる必要がないことから、施工が簡単である。また、この壁用化粧シートは、多数の微細な凹形状１３ａによる吸着力（粘着力）によって被着体へ吸着（粘着）するので、簡単に剥離可能であり、糊残りもなく、被着体の破損も防げることから、壁用化粧シートの貼り付け前の状態へ簡単に復元することも可能である。 (Wall decorative sheet)
The pressure-sensitive adhesive sheet of the present invention can be applied as a decorative sheet for walls. More specifically, it can be applied to, for example, wallpaper, noncombustible boards, gypsum boards, calcium silicate boards, concrete, aluminum boards, and the like.
Due to the easily peelable and re-attachable properties of the pressure-sensitive adhesive sheet of the present invention, not only can the workability at the time of building the house be improved, but also the interior redressing work by the resident himself after the building of the house, that is, a simple reform Can be easily constructed. In particular, since it is not necessary to use water glue as in the case of conventional wallpaper, the construction is simple. Further, since the decorative sheet for a wall is adsorbed (adhered) to the adherend by the adsorbing force (adhesive force) due to the numerous fine concave shapes 13a, it can be easily peeled off, there is no adhesive residue, and the adherend is not adhered. Can be prevented from being damaged, and it can be easily restored to the state before the wall decorative sheet was attached.
（天井用化粧シート）
　本発明の粘着シートは、天井用化粧シートとして適用することができる。天井用化粧シートの具体例は、上記壁用化粧シートに例示したものと同様である。
　本発明の粘着シートの剥離容易性及び再貼り付け可能な特性により、家屋建築時の作業性を高めることができるだけではなく、家屋の建築後における居住者自身による内装の化粧直し作業、すなわち、簡易リフォームを容易に施工することが可能となる。特に、天井への施工は、通常の壁紙を利用すると施工が困難であるが、従来の壁紙のように水糊を用いる必要がないことから、施工が簡単である。また、この天井用化粧シートは、多数の微細な凹形状１３ａによる吸着力（粘着力）によって被着体へ吸着（粘着）するので、簡単に剥離可能であり、糊残りもなく、被着体の破損も防げることから、天井用化粧シートの貼り付け前の状態へ簡単に復元することも可能である。 (Cosmetic sheet for ceiling)
The pressure-sensitive adhesive sheet of the present invention can be applied as a decorative sheet for ceiling. Specific examples of the decorative sheet for ceiling are the same as those exemplified for the decorative sheet for wall.
Due to the easily peelable and re-attachable properties of the pressure-sensitive adhesive sheet of the present invention, not only can the workability at the time of building the house be improved, but also the interior redressing work by the resident himself after the building of the house, that is, a simple reform Can be easily constructed. In particular, the installation on the ceiling is difficult if ordinary wallpaper is used, but the installation is simple because there is no need to use water glue as in the case of conventional wallpaper. Further, since the decorative sheet for ceiling is adsorbed (adhered) to the adherend by the adsorbing force (adhesive force) due to the numerous fine concave shapes 13a, it can be easily peeled off, there is no adhesive residue, and the adherend is not adhered. Can be easily restored to the state before the ceiling decorative sheet was attached.
（建具用化粧シート）
　本発明の粘着シートは、建具用化粧シートとして適用することができる。
　本発明の粘着シートの剥離容易性及び再貼り付け可能な特性により、建具製造時の作業性を高めることができるだけではなく、家屋の建築後における居住者自身による建具外観の化粧直し作業における作業の作業性を高めることもできる。この建具用化粧シートは、多数の微細な凹形状１３ａによる吸着力（粘着力）によって被着体へ吸着（粘着）するので、簡単に剥離可能であり、糊残りもなく、被着体の破損も防げることから、建具用化粧シートの貼り付け前の状態へ簡単に復元することも可能である。
　建具用化粧シートの貼り付け対象物である建具としては、例えば、手すり、窓枠（サッシ）、扉、扉枠、ふすま、造作部材（廻り縁、鴨居、腰壁、敷居）等を例示できるが、その他、どのようなものであってもよい。 (Cosmetic sheet for fittings)
The pressure-sensitive adhesive sheet of the present invention can be applied as a decorative sheet for fittings.
The ease of peeling and re-attachability of the pressure-sensitive adhesive sheet of the present invention not only can enhance the workability during the manufacturing of the fittings, but also the work of the resident himself after the construction of the house in the work of redressing the appearance of the fittings. It can also enhance the character. Since this decorative sheet for fittings is adsorbed (adhered) to the adherend by the adsorbing force (adhesive force) of the numerous fine concave shapes 13a, it can be easily peeled off, there is no adhesive residue, and the adherend is damaged. Therefore, it is possible to easily restore the state before the decorative sheet for fittings is pasted.
Examples of the fittings to which the decorative sheet for fittings are to be pasted include handrails, window frames (sashes), doors, door frames, brans, construction members (surrounding edges, Kamoi, waist walls, sills), and the like. , Or any other type.
（家具用化粧シート）
　本発明の粘着シートは、家具用化粧シートとして適用することができる。本発明の粘着シートの剥離容易性及び再貼り付け可能な特性により、家具製造時の作業性を高めることができるだけではなく、家具購入後の利用者自身による家具外観の化粧直し作業における作業の作業性を高めることもできる。この家具用化粧シートは、多数の微細な凹形状１３ａによる吸着力（粘着力）によって被着体へ吸着（粘着）するので、簡単に剥離可能であり、糊残りもなく、被着体の破損も防げることから、家具用化粧シートの貼り付け前の状態へ簡単に復元することも可能である。
　家具用化粧シートの貼り付け対象物である家具としては、例えば、机、食卓等のテーブル、箪笥、棚、ベッド等を例示できるが、その他、どのようなものであってもよい。 (Furniture decorative sheet)
The pressure-sensitive adhesive sheet of the present invention can be applied as a decorative sheet for furniture. The ease of peeling and re-attachment of the pressure-sensitive adhesive sheet of the present invention not only can improve the workability during furniture manufacturing, but also can improve the workability of the work of refinishing the appearance of the furniture by the user himself after purchasing the furniture. Can also be increased. Since the decorative sheet for furniture is adsorbed (adhered) to the adherend by the adsorbing force (adhesive force) of the numerous fine concave shapes 13a, it can be easily peeled off, there is no adhesive residue, and the adherend is damaged. Can be easily restored to the state before the decorative sheet for furniture was attached.
As furniture to which the decorative sheet for furniture is to be pasted, for example, tables such as desks and dining tables, chests of drawers, shelves, beds and the like can be exemplified, but any other items may be used.
（外装用シート）
　本発明の粘着シートは、上述した家屋内における各種化粧シートとしての利用に限られず、屋外で主に用いる外装用シートとして用いてもよい。
　本発明の粘着シートの剥離容易性及び再貼り付け可能な特性により、外装の一時的な化粧直し作業の作業性を高めることができる。この外装用シートは、多数の微細な凹形状１３ａによる吸着力（粘着力）によって被着体へ吸着（粘着）するので、簡単に剥離可能であり、糊残りもなく、被着体の破損も防げることから、外装用シートの貼り付け前の状態へ簡単に復元することも可能である。
　外装用シートの貼り付け対象物としては、例えば、玄関ドア、各種エクステリア、窓、窓枠、外壁等の家屋に関する物の他、車両等の移動体を貼り付け対象物としてもよく、どのようなものであってもよい。 (Sheet for exterior)
The pressure-sensitive adhesive sheet of the present invention is not limited to use as various decorative sheets in a house as described above, and may be used as an exterior sheet mainly used outdoors.
The ease of peeling and the re-attachment property of the pressure-sensitive adhesive sheet of the present invention can enhance the workability of the temporary re-dressing work of the exterior. Since this exterior sheet is adsorbed (adhered) to the adherend by the adsorbing force (adhesive force) of the numerous fine concave shapes 13a, it can be easily peeled off, there is no adhesive residue, and the adherend is damaged. Since it can be prevented, it is also possible to easily restore the state before the exterior sheet is attached.
The object to which the exterior sheet is to be attached may be, for example, an object related to a house such as an entrance door, various exteriors, windows, window frames, outer walls, or a moving object such as a vehicle. It may be something.
（窓用フィルム）
　また、本発明の粘着シートは、内装用、外装用に限らず、窓に貼り付けられる窓用シートに用いてもよい。窓用シートでは、単に意匠性を主とした化粧シートとしてだけでなく、各種機能を付与した機能性シートであってもよい。機能性シートとしては、例えば、赤外線、紫外線等の特定の波長域の光を吸収又は反射する光学フィルターの機能を備えていてもよいし、防汚機能を備えていてもよく、公知の機能を適宜付与可能である。また、ステンドグラス調の模様やカッドガラス調の模様等の装飾を備える化粧シートであってもよい。 (Window film)
Further, the pressure-sensitive adhesive sheet of the present invention is not limited to interior and exterior use, and may be used as a window sheet to be attached to a window. The window sheet may be not only a decorative sheet mainly having a design property but also a functional sheet having various functions. The functional sheet, for example, may have the function of an optical filter that absorbs or reflects light in a specific wavelength range such as infrared light and ultraviolet light, may have an antifouling function, and may have a known function. It can be provided as appropriate. Further, a decorative sheet provided with a decoration such as a stained glass pattern or a quad glass pattern may be used.
（粘着シートのその他の用途）
　本発明の粘着シートは、ラベル、シール、ワッペンに適用してもよい。各種包裝容器、特に、ペットボトル、硝子瓶等の容器では、廃棄や廃品回収再生の際にラベルと容器とを簡単に分離することが要求されるので、このような用途に好適に用いることができる。
　本発明の粘着シートは、貼り付けることにより簡易的にホワイトボード（白板）や黒板の機能を提供可能な筆記面形成シートに適用してもよい。これにより、様々な壁面をホワイトボード面等として利用可能となり、また、簡単に元の状態に戻すことができる。 (Other uses of adhesive sheet)
The pressure-sensitive adhesive sheet of the present invention may be applied to labels, seals, and patches. Various packaging containers, especially containers such as PET bottles and glass bottles, are required to be easily separated from the label and the container at the time of disposal or waste collection / recycling. it can.
The pressure-sensitive adhesive sheet of the present invention may be applied to a writing surface forming sheet capable of simply providing a function of a whiteboard (white board) or a blackboard by sticking. As a result, various wall surfaces can be used as a whiteboard surface or the like, and the original state can be easily restored.
　本発明の粘着シートは、ポスターや各種広告表示に用いることができる。これにより、どのような壁面であっても、広告等を表示でき、また、被着体上に糊残り無く簡単に元の状態に戻すことができる。
　本発明の粘着シートは、建築物や各種車両の窓に貼り付けて透過光量を調整するサンバイザーフィルムや防曇フルムに用いることができる。これにより、利用者が自分の好みに応じてサンバイザーや防曇の機能を付与できるだけでなく、簡単に元の状態に戻すことができる。 The pressure-sensitive adhesive sheet of the present invention can be used for posters and various advertisement displays. Thus, an advertisement or the like can be displayed on any wall surface, and the original state can be easily restored without adhesive residue on the adherend.
The pressure-sensitive adhesive sheet of the present invention can be used for a sun visor film or an anti-fog film that is attached to a window of a building or various vehicles to adjust the amount of transmitted light. As a result, the user can not only provide a sun visor or anti-fog function according to his / her preference, but also easily return to the original state.
　本発明の粘着シートは、メニューや値札、バーコード等に用いることができる。月ごとにメニューを貼り替えたり、一時的に値札やバーコードを貼り替えたりする用途に好適である。
　本発明の粘着シートは、封筒や箱のフラップ（蓋）部分に用いることができる。これにより、簡易的に封をすることができ、開閉自在な封筒や箱を実現できる。
　これらシート等の基材と粘着シートの間に密着性を良好にするプライマー層等があってもよく、そのプライマー層は基材側にあった方が使いやすく、またそのプライマーの材質、厚み等は問わない。 The adhesive sheet of the present invention can be used for menus, price tags, bar codes, and the like. It is suitable for use such as changing the menu every month or temporarily changing the price tag or barcode.
The pressure-sensitive adhesive sheet of the present invention can be used for flaps (covers) of envelopes and boxes. As a result, the envelope can be easily sealed and can be opened and closed freely.
There may be a primer layer or the like for improving the adhesiveness between the base material such as the sheet and the pressure-sensitive adhesive sheet, and the primer layer is easier to use on the base material side, and the material and thickness of the primer Does not matter.
　本発明の粘着シートは、付箋の全面、又は、一部に用いてもよい。本発明の粘着シートは、粘着力の作り分けを容易に行うことができるので、用途に応じた粘着力を備えた貼り付け可能な付箋を容易に実現できる。また、本発明の粘着シートは、付箋と近い利用形態として、行き先表示板や名札等に用いてもよい。
　本発明の粘着シートは、各種ディスプレイ装置の表示面に貼り付けられる反射防止、電磁波遮蔽、光学フィルター、視野角の拡大乃至は制限、帯電防止等の各種機能を発現する各種機能性シートに用いることができる。この各種機能性シートは、工場等におけるディスプレイ装置製造時に貼り付けられるものであってもよいし、ディスプレイ装置の利用者が別途購入して貼り付けられるものであってもよい。 The pressure-sensitive adhesive sheet of the present invention may be used on the whole or a part of the tag. Since the pressure-sensitive adhesive sheet of the present invention can easily perform the formation of the adhesive force, it is possible to easily realize a stickable sticky note having the adhesive force according to the application. Further, the pressure-sensitive adhesive sheet of the present invention may be used for a destination display plate, a name tag, or the like as a usage pattern similar to a tag.
The pressure-sensitive adhesive sheet of the present invention is used for various functional sheets that exhibit various functions such as anti-reflection, electromagnetic wave shielding, optical filters, expansion or restriction of a viewing angle, and antistatic which are attached to the display surface of various display devices. Can be. The various functional sheets may be attached at the time of manufacturing the display device at a factory or the like, or may be separately purchased and attached by a user of the display device.
　本発明の粘着シートは、塗装等の各種加工の際に用いる養生テープやマスキングテープに用いてもよい。
　本発明の粘着シートは、面ファスナーとして用いる面ファスナーシート、面ファスナーテープ等に用いてもよい。また、本発明の粘着シートは、面ファスナーと近い利用形態として、包帯止め具に用いてもよい。 The pressure-sensitive adhesive sheet of the present invention may be used as a curing tape or a masking tape used in various processes such as painting.
The pressure-sensitive adhesive sheet of the present invention may be used for a hook-and-loop fastener sheet, a hook-and-loop fastener tape, etc. used as a hook-and-loop fastener. Further, the pressure-sensitive adhesive sheet of the present invention may be used as a bandage stopper as a use form close to a hook-and-loop fastener.
　本発明の粘着シートは、シート状の車載アンテナや車載センサ等に用いてもよい。
　本発明の粘着シートは、配送伝票等の帳票に用いてもよい。これにより、例えば、配送が終わった後、帳票を剥がして配送箱の再利用が可能となる。
　本発明の粘着シートは、テーブルクロスや、タイル等、滑り止めが必要な掛け物等に用いてもよい。本発明の粘着シートは、微細な凹形状１３ａによる吸着力（粘着力）によって被着体へ吸着（粘着）するので、十分な滑り止め効果を発揮可能である。 The pressure-sensitive adhesive sheet of the present invention may be used for a sheet-shaped vehicle-mounted antenna, a vehicle-mounted sensor, or the like.
The adhesive sheet of the present invention may be used for forms such as delivery slips. Thus, for example, after the delivery is completed, the form can be peeled off and the delivery box can be reused.
The pressure-sensitive adhesive sheet of the present invention may be used for hanging objects requiring slip prevention, such as tablecloths and tiles. Since the pressure-sensitive adhesive sheet of the present invention is adsorbed (adhered) to the adherend by the adsorbing force (adhesive force) of the fine concave shape 13a, it can exhibit a sufficient anti-slip effect.
　本発明の粘着シートは、上述した化粧シートのように、貼り付け後に第１シートが残る利用形態に限らず、粘着層のみが最終的に被着体に残る形態、すなわち、両面（粘着）テープとして用いてもよい。その場合、粘着層を挟むように配置される第１シート及び第２シートの双方を剥離性基材シートにより構成するとよい。 The pressure-sensitive adhesive sheet of the present invention is not limited to the use form in which the first sheet remains after pasting, as in the decorative sheet described above, but the form in which only the pressure-sensitive adhesive layer finally remains on the adherend, that is, a double-sided (pressure-sensitive) tape May be used. In this case, it is preferable that both the first sheet and the second sheet disposed so as to sandwich the adhesive layer are formed of a peelable base sheet.
　以上説明したように、本実施形態の化粧シート（粘着シート）１は、粘着層１３の両面に気泡に基づく凹形状が複数形成されている。よって、表層シートを加熱することなく粘着シートの形態の化粧シートとすることができ、表層シートにダメージを与えることなく容易に製造可能である。
　また、粘着層１３の粘着力は、凹形状１３ａの吸着力によるものであるから、リワーク性が高く、貼り付けを失敗したとしても張り直しが容易であり、使い勝手がよい。
　さらに、凹形状１３ａは、微細なサイズであって多数設けられていることから、被着体の表面に多少の凹凸が有ったとしても、粘着力（吸着力）を発揮することができる。
　さらにまた、化粧シート１を剥がした後の被着体の表面には、糊残りのような現象は発生しないことから、清掃の必要がなく、そのまま再貼り付けを行うことができ、作業性が良好である。
　また、本実施形態の化粧シート（粘着シート）１は、加熱することなく粘着層１３を形成可能であることから、熱に弱い表層シートを含め、様々な形態の表層シートを利用して粘着シートを構成することが可能である。 As described above, in the decorative sheet (adhesive sheet) 1 of the present embodiment, a plurality of concave shapes based on bubbles are formed on both surfaces of the adhesive layer 13. Accordingly, a decorative sheet in the form of a pressure-sensitive adhesive sheet can be obtained without heating the surface layer sheet, and can be easily manufactured without damaging the surface layer sheet.
In addition, since the adhesive force of the adhesive layer 13 is based on the suction force of the concave shape 13a, the reworking property is high, and even if the attachment fails, it is easy to re-stretch and easy to use.
Further, since the concave shape 13a has a fine size and is provided in a large number, even if there is some unevenness on the surface of the adherend, it can exert an adhesive force (adsorbing force).
Furthermore, since the phenomenon such as adhesive residue does not occur on the surface of the adherend after the decorative sheet 1 has been peeled off, it is not necessary to clean, and it can be re-applied as it is, thus improving workability. Good.
Moreover, since the decorative sheet (pressure-sensitive adhesive sheet) 1 of the present embodiment can form the pressure-sensitive adhesive layer 13 without heating, the pressure-sensitive adhesive sheet can be formed by using various forms of the surface layer sheet, including the surface layer weak to heat. Can be configured.
（変形形態）
　以上説明した実施形態に限定されることなく、種々の変形や変更が可能であって、それらも本発明の範囲内である。 (Modified form)
Various modifications and changes are possible without being limited to the embodiment described above, and these are also within the scope of the present invention.
（１）実施形態において、樹脂層を備えた化粧シートの例を挙げて、粘着シートの説明を行ったが、これに限らず、例えば、ポスター等の通常の印刷物を粘着シートの形態としてもよい。 (1) In the embodiment, the description of the pressure-sensitive adhesive sheet has been given by giving an example of a decorative sheet provided with a resin layer. However, the present invention is not limited to this. .
（２）実施形態において、表層シートの構成は、基材と樹脂層とを備える構成である例を挙げて説明した。これに限らず、例えば、表層シートは、単層であってもよいし、３層以上のより複雑な構成であってもよい。また、表層シートの素材は、実施例に挙げた例の他、紙や熱可塑性樹脂等により構成されていてもよい。 (2) In the embodiment, the configuration of the surface layer sheet has been described by using an example in which the configuration includes the base material and the resin layer. However, the present invention is not limited to this. For example, the surface sheet may be a single layer, or may have a more complicated configuration of three or more layers. The material of the surface layer sheet may be made of paper, a thermoplastic resin, or the like, in addition to the examples given in the embodiments.
　なお、各実施形態及び変形形態は、適宜組み合わせて用いることもできるが、詳細な説明は省略する。また、本発明は以上説明した各実施形態によって限定されることはない。 Note that the embodiments and the modified embodiments can be appropriately combined and used, but detailed description is omitted. Further, the present invention is not limited by the embodiments described above.
１　　　化粧シート
１０　　表層シート（第１シート）
１１　　基材
１２　　樹脂層
１３　　粘着層
１３ａ　凹形状
１４　　剥離性基材シート（第２シート）
５０　　被着体
１３０　気泡含有組成物 1 decorative sheet 10 surface sheet (first sheet)
DESCRIPTION OF SYMBOLS 11 Base material 12 Resin layer 13 Adhesive layer 13a Concave shape 14 Peelable base material sheet (2nd sheet)
50 adherend 130 bubble-containing composition

Claims (6)

  1. 　第１シートと、
    　前記第１シートの裏面に積層された粘着層と、
    　前記粘着層の前記第１シートとは反対側に積層された第２シートと、
    　を備え、
    　前記粘着層は、その両面に複数の凹形状を備えており、
    　前記凹形状は、前記粘着層の両面に均等に形成されており、
    　前記第１シート側の面に開口する前記凹形状の各開口部の直径の平均値をＤａｖｅ １とし、前記第２シート側に開口する前記凹形状の各開口部の直径の平均値をＤａｖｅ ２としたときに、
    　｜Ｄａｖｅ １－Ｄａｖｅ ２｜／Ｄａｖｅ ２≦０．５
    　の関係を満たす粘着シート。     A first sheet,
    An adhesive layer laminated on the back surface of the first sheet;
    A second sheet laminated on the side of the adhesive layer opposite to the first sheet;
    With
    The adhesive layer has a plurality of concave shapes on both surfaces thereof,
    The concave shape is formed evenly on both surfaces of the adhesive layer,
    The average value of the diameters of the recessed openings that open on the surface on the first sheet side is D ave 1, and the average value of the diameters of the recessed openings that open on the second sheet side is D. When ave 2 is used,
    | D ave 1 -D ave 2 | / D ave 2 ≦ 0.5
    Adhesive sheet that satisfies the relationship.
  2. 　請求項１に記載の粘着シートにおいて、
    　前記粘着層の層厚ｔは、２０μｍ≦ｔ≦４０μｍの範囲にあること、
    　を特徴とする粘着シート。     The pressure-sensitive adhesive sheet according to claim 1,
    The thickness t of the adhesive layer is in the range of 20 μm ≦ t ≦ 40 μm,
    An adhesive sheet characterized by the following.
  3. 　請求項１又は請求項２に記載の粘着シートにおいて、
    　前記粘着層は、液状の樹脂組成物に気泡を含めて乾燥させたことにより前記気泡に基づく前記凹形状が両面に複数形成されていること、
    　を特徴とする粘着シート。     The pressure-sensitive adhesive sheet according to claim 1 or 2,
    The pressure-sensitive adhesive layer, a plurality of concave shapes based on the bubbles are formed on both surfaces by drying the liquid resin composition including the bubbles,
    An adhesive sheet characterized by the following.
  4. 　請求項１から請求項３までのいずれかに記載の粘着シートにおいて、
    　前記第１シートは、貼り付け後に表面となる表層シートであり、
    　前記第２シートは、剥離性基材シートであること、
    　を特徴とする粘着シート。     The pressure-sensitive adhesive sheet according to any one of claims 1 to 3,
    The first sheet is a surface layer sheet that becomes a surface after pasting,
    The second sheet is a peelable substrate sheet,
    An adhesive sheet characterized by the following.
  5. 　請求項４に記載の粘着シートにおいて、
    　前記粘着層は、前記剥離性基材シートに液状の樹脂組成物を塗工して乾燥させた後に、前記表層シートがラミネートされて構成されていること、
    　を特徴とする粘着シート。     The pressure-sensitive adhesive sheet according to claim 4,
    The pressure-sensitive adhesive layer, after applying and drying a liquid resin composition on the releasable substrate sheet, the surface layer sheet is configured to be laminated,
    An adhesive sheet characterized by the following.
  6. 　請求項４又は請求項５に記載の粘着シートにおいて、
    　前記表層シートは、紙、又は、熱可塑性樹脂により形成されていること、
    　を特徴とする粘着シート。     In the pressure-sensitive adhesive sheet according to claim 4 or 5,
    The surface layer sheet is made of paper, or a thermoplastic resin,
    An adhesive sheet characterized by the following.
PCT/JP2019/036990 2018-03-01 2019-09-20 Adhesive sheet WO2020059855A1 (en)

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