JP2019172988A - Pressure sensitive adhesive sheet for housing material - Google Patents

Abstract

To provide a pressure sensitive adhesive sheet for a housing material having reworkability.SOLUTION: A pressure sensitive adhesive sheet 1 for housing material includes: a base material 11 and a resin layer 12, as a surface layer sheet configured to serve as a surface after adhesion; an adhesive layer 13 laminated on a rear face thereof; and a detachable base material sheet 14 laminated on a side opposite to the base material 11 and the resin layer 12 of the adhesive layer 13. The adhesive layer 13 is provided with a plurality of concave shapes 13a on both sides thereof. With the concave shapes 13a exhibiting adsorption, an adhesive force to an adherend is generated and reworkability can be secured.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an adhesive sheet for building materials.

When a decorative sheet is attached to a building material, an adhesive (also referred to as an adhesive) is applied to the decorative sheet and laminated (adhered) to an adherend such as wood or a non-combustible material. .
In addition, if it is assumed that the decorative sheet once pasted is peeled off and the position to be pasted is changed and then pasted again, or another decorative sheet is pasted again on the peeled mark, instead of the adhesive It is also possible to use a pressure-sensitive adhesive material (also referred to as a pressure-sensitive adhesive) that is relatively easy to peel off. However, in reality, a decorative sheet in the form of being laminated using a conventional adhesive material is difficult to reuse such as re-peeling and re-adhering. If the production of the decorative material fails, 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. For this reason, in order to affix a decorative sheet, special equipment was required, or a skilled technique (person) was required, and the difficulty was high. Therefore, in order to make it easier to use the decorative sheet, it has been desired to improve the so-called reworkability in which, when pasting fails, it can be peeled off and pasted again as it is.

  On the other hand, Patent Document 1 discloses a technique related to a micro sucker film formed of an adhesive layer having a large number of minute sucker groups on the adherend side surface. Since this micro sucker film can be reversibly attached to and peeled off from the adherend, if a building material pressure-sensitive adhesive sheet comprising such a micro sucker film can be realized, a building material with reworkability can be realized. It is thought that it can be used as a pressure-sensitive adhesive sheet. However, although the composition disclosed in Patent Document 1 is capable of producing a micro sucker film even at a temperature of about room temperature, it achieves a sufficient balance between adsorbing force and peeling force on the adherend, and is sufficient. It was difficult to stably produce a pressure-sensitive adhesive layer having reworkability, and the composition could not be applied to a pressure-sensitive adhesive sheet for building materials.

JP 2017-36404 A

  The subject of this invention is providing the adhesive sheet for building materials provided with rework property.

As a result of various trial manufactures, evaluations, and examinations, the inventors of the present application have determined that even if the composition disclosed in Patent Document 1 is used, the method of manufacturing an adhesive layer having a micro suction cup group and the manufacturing conditions can be used. Various changes in the shape of the air bubbles, especially the concave shape formed by opening the vicinity of the surface to the surface of the adhesive layer, may cause various changes in the balance between the adsorption force and the peeling force, as well as the reworkability. I found. And, in the form of having a group of minute suction cups with concave shapes on both the front and back surfaces of the adhesive layer, it was found that the adsorbing force and the peeling force are properly balanced (balanced) and sufficient reworkability can be obtained. The present invention has been reached.
That is, this invention solves the said subject by the following solution means. In addition, in order to make an understanding easy, although the code | symbol corresponding to embodiment of this invention is attached | subjected and demonstrated, it is not limited to this.

  The first invention is the first sheet (10), the adhesive layer (13) laminated on the back surface of the first sheet (10), and the first sheet (10) of the adhesive layer (13). A second sheet (14) laminated on the opposite side, and the adhesive layer (13) is a building material pressure-sensitive adhesive sheet (1) having a plurality of concave shapes (13a) on both sides thereof.

  A second invention is characterized in that, in the pressure-sensitive adhesive sheet for building materials (1) according to the first invention, the concave shape (13a) is uniformly formed on both surfaces of the pressure-sensitive adhesive layer (13). This is a building material pressure-sensitive adhesive sheet (1).

3rd invention WHEREIN: In the adhesive sheet for building materials (1) as described in 2nd invention, the average value of the diameter of each opening part of the said concave shape (13a) opened to the surface at the side of the said 1st sheet | seat (10). was a ^{D ave} _1, the mean value of the diameters of the openings of the second sheet (14) opening to the side the concave shape (13a) when the _{^{D ave 2, | D ave 1}} -D ave 2 | It is a building material pressure-sensitive adhesive sheet (1) characterized by satisfying a relationship of / D ^ave ₂ ≦ 0.5.

  4th invention WHEREIN: In the adhesive sheet for building materials (1) in any one from 1st invention to 3rd invention, the layer thickness t of the said adhesion layer (13) is the range of 20 micrometers <= t <= 40 micrometers. It is the adhesive sheet (1) for building materials characterized by being in.

  5th invention is the adhesive sheet (1) for building materials in any one from 1st invention to 4th invention, The said adhesion layer (13) is a bubble in a liquid resin composition (130). It is a building material pressure-sensitive adhesive sheet (1) characterized in that a plurality of the concave shapes (13a) based on the bubbles are formed on both surfaces by including and drying.

  6th invention is the surface layer sheet | seat (10) in which the said 1st sheet | seat (10) becomes a surface after affixing in the adhesive sheet (1) for building materials in any one from 1st invention to 5th invention. The second sheet (14) is a peelable base sheet (14), and is a building material pressure-sensitive adhesive sheet (1).

  According to a seventh invention, in the pressure-sensitive adhesive sheet for building materials (1) according to the sixth invention, the pressure-sensitive adhesive layer (13) applies a liquid resin composition (130) to the peelable substrate sheet (14). A pressure-sensitive adhesive sheet for building materials (1), wherein the surface layer sheet (10) is laminated after being worked and dried.

  In an eighth invention, in the building material pressure-sensitive adhesive sheet (1) according to the sixth invention or the seventh invention, the surface layer sheet (10) is formed of paper or a thermoplastic resin. It is a pressure-sensitive adhesive sheet for building materials (1).

  A ninth invention is a building material (110, 120) to which the building material pressure-sensitive adhesive sheet (1) according to any one of the first to eighth inventions is attached.

  ADVANTAGE OF THE INVENTION According to this invention, the adhesive sheet for building materials provided with the rework property can be provided.

It is a figure which shows 1st Embodiment of the adhesive sheet for building materials by this invention. It is a figure which shows the form at the time of use of the adhesive sheet 1 for building materials sequentially. It is a figure which shows the manufacturing apparatus of the adhesive sheet 1 for building materials. It is a figure explaining the manufacturing method of the adhesive sheet 1 for building materials. It is the photograph which expanded the adhesive layer 13 of the adhesive sheet 1 for building materials of an Example seeing from the direction of the to-be-adhered body. It is the figure expanded by the cross section of the direction orthogonal to the sheet | seat surface of the adhesion layer 13 of the adhesive sheet 1 for building materials of an Example. It is a figure which shows the peeling force of an Example and a comparative example. It is a figure which shows the observation result of the sample 1. FIG. It is a figure which shows the observation result of the sample 2. FIG. It is a figure which shows the observation result of the sample 3. FIG. It is a figure which shows the observation result of the sample 4. FIG. It is a figure which shows the building material 110 which affixed the adhesive sheet 1 for building materials of this invention. It is a figure which shows the building material 120 which affixed the adhesive sheet 1 for building materials of this invention.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

(Embodiment)
FIG. 1 is a view showing a first embodiment of a building material pressure-sensitive adhesive sheet according to the present invention.
In addition, each figure shown below including FIG. 1 is the figure shown typically, and the magnitude | size and shape of each part are exaggerated suitably for easy understanding.
In the following description, specific numerical values, shapes, materials, and the like are shown and described, but these can be changed as appropriate.
In this specification, the terms “plate”, “sheet”, “film” and the like are used, but these are generally used in the order of “thickness”, “plate”, “sheet”, “film”. It is used in the book as well. However, since there is no technical meaning for such proper use, these terms can be used as appropriate, and the terms in each claim and the present specification are interpreted in the same way even if appropriate. Shall be able to.
In the following description, as an example of a building material pressure-sensitive adhesive sheet, a base sheet 11 and a resin layer 12 are laminated and bonded as a first sheet 10 as shown in FIG. The adhesive sheet 1 for building materials using a surface having a concavo-convex shape (concave pattern) 1a on the side surface, that is, the surface will be described. For example, only the printing layer without the resin layer 12 on the substrate 11 is described. It may be a pressure-sensitive adhesive sheet for various building materials, and may be provided with a resin layer 12 and a printed layer on the base material 11, or may not be provided with the resin layer 12 on the base material 11. You may provide only the uneven | corrugated shape 1a.

In the first embodiment illustrated in FIG. 1, the building material pressure-sensitive adhesive sheet 1 is a surface sheet in which a base material 11 and a resin layer 12 are laminated and bonded together, a pressure-sensitive adhesive layer 13, and a peelable base material. And a sheet 14.
The base material 11 is a layer that serves as a base necessary for forming the resin layer 12. As the base material 11, for example, paper, resin sheet, metal foil, woven fabric or non-woven fabric may be used as a material.
Examples of paper include high-quality paper, thin paper, kraft paper, linter paper, parchment paper, glassine paper, sulfuric acid paper, etc. used in various known decorative papers, or mixed paper in which glass fibers and resin fibers are mixed with these papers, these In this paper, impregnated paper impregnated with rubber latex or acrylic resin can be used. As for the basis weight of paper, a thing about 20-200 g / m < ² > can be used normally.
As a resin sheet, it can select suitably from the material of the material illustrated by the below-mentioned resin layer 12, and the thickness.
As metal foil, it can select suitably from aluminum, iron, copper, tin, or the alloy containing these metals. The thickness of the metal foil can usually be about 10 to 50 μm.
As the woven or non-woven fabric, a polyester resin, polyamide resin, acrylic resin, or a woven or non-woven fabric using a fiber made of glass can be used. The basis weight of the woven fabric or the nonwoven fabric can generally be about ²⁰ to 200 g / m ² .

The resin layer 12 is laminated | stacked on the surface of the front side of the base material 11, and the several uneven | corrugated shape 1a is formed in the surface. For ease of understanding, the resin layer 12 shown in FIG. 1 is shown as a single layer, but the resin layer 12 may be composed of a plurality of layers having different compositions and structures. The uneven shape 1a of the resin layer 12 may represent, for example, a wood conduit, a fabric surface uneven shape, or a stone uneven shape. It may be a form.
Examples of the resin that forms the resin layer 12 include polyethylene, polypropylene, ethylene-propylene-butene copolymers, olefinic resins such as olefinic thermoplastic elastomers, polymethyl methacrylate, polyethyl methacrylate, and methyl methacrylate-butyl methacrylate. Acrylic resins such as polymers, vinyl chloride resins such as polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, ethylene glycol-terephthalic acid-isophthalic acid copolymer, polyester resins such as polyester thermoplastic elastomer, polystyrene Styrene resins such as acrylonitrile-styrene copolymer, acrylonitrile-butadiene-styrene copolymer (ABS), polyisoprene, natural rubber, ethylene Pirengomu (EPR), chloroprene rubber or the like, urethane resins, cellulose resins, polycarbonate resins, polyamide resins, and the like. In addition, you may use other than the resin illustrated above. The thickness of the resin layer 12 may be appropriately selected according to the application, required performance, etc., but is usually about 20 μm to 10,000 μm.
When it is necessary to see through the resin layer 12 and visually recognize the design appearance of the substrate 11 or the pattern layer on the back surface, the resin layer 12 does not contain an occlusive pigment or additive, and the design appearance of the back surface It shall be transparent enough to be visually recognized. The term “transparent” as used herein includes colorless and transparent as well as colored and non-transparent transparency.

Further, in the present embodiment illustrated in FIG. 1, the first sheet 10 as the surface layer sheet has been described with an example in which the base material 11 is directly laminated and bonded to the back surface of the resin layer 12. For example, another layer may be provided between the base material 11 and the resin layer 12. For example, a pattern layer (printing layer) on which a pattern is printed may be provided between the base material 11 and the resin layer 12, and all or part of the resin layer 12 may be made of a transparent resin.
Further, in order to improve the adhesive force between the resin layer 12 and the base material 11, various known adhesive layers, easy adhesion primer layers, or both of these layers may be provided between these two layers.
Moreover, in order to improve the surface durability (scratch resistance, abrasion resistance, stain resistance, etc.) of the pressure-sensitive adhesive sheet 1 for building materials, and to adjust the glossiness of the surface appropriately, the surface of the pressure-sensitive adhesive sheet 1 for building materials is adjusted. Furthermore, a surface protective layer may be laminated. The surface protective layer can be formed by lamination of a resin layer, coating of a coating film, or a combination of lamination of a resin layer and coating of a coating film.
The resin layer used for the surface protective layer can be appropriately selected from the materials and thicknesses exemplified above for the resin layer 12.
In the case of coating a coating, for example, a known thermosetting resin such as a thermosetting urethane resin, a thermosetting polyester resin, an epoxy resin, or a melamine resin (one liquid curing type or two liquid curing type). It can be appropriately selected from known ionizing radiation curable resins such as acrylate, epoxy, and unsaturated polyesters that are crosslinked or polymerized by irradiation with ionizing radiation such as ultraviolet rays or electron beams. The thickness of the coating film can be generally about 1 to 100 μm (film thickness after curing).
The pattern layer is formed by appropriately printing a desired pattern by a known printing method using a known ink. What is necessary is just to form a pattern layer in the base material 11, the resin layer 12, or the other appropriate layer.
The ink is formed by adding a colorant and other additives as required to the resin binder.
The resin binder is selected according to the material to be printed and the required performance. For example, acrylic resin, vinyl chloride-vinyl acetate copolymer, urethane resin, polyester resin, cellulose resin, polyamide resin, alkyd System resin or the like is used. Examples of the colorant include inorganic pigments such as petals, vermilion red, cadmium red, titanium yellow, iron yellow, ultramarine, bitumen, cobalt blue, patina, iron black, carbon black, titanium white, zinc white, and antimony white. , Quinacridone red, polyazo red, isoindolinone yellow, nickel-azo complex, phthalocyanine blue, azomethine azo black pigments, perylene black pigments and other organic pigments and dyes, and aluminum, brass, tin, etc. A pearlescent pigment made of a scale-like foil piece such as a metallic pigment, titanium dioxide-coated mica, basic lead carbonate, or a shell of a pearl shell can be used alone or in combination of two or more. .
As the pattern, a wood grain pattern, a stone pattern, a cloth pattern, a leather texture pattern, a geometric pattern, a character, a solid surface, or a combination thereof can be appropriately selected according to a desired design appearance.

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 is also referred to as the back surface side of the substrate 11). This is a layer having adhesiveness to the adherend 50 (see FIG. 2). The pressure-sensitive adhesive layer 13 includes a plurality of concave shapes 13a that are open on both sides thereof, that is, the side in contact with the substrate 11 and the side in contact with the second sheet 14 that is a peelable substrate sheet. In addition, the adhesive layer 13 has elasticity, and each of the plurality of concave shapes 13a acts as a fine sucker. Therefore, the adhesive layer 13 can exert adhesive force (adsorptive power) on various adherends 50. (See FIG. 2 (c)).
The pressure-sensitive adhesive layer 13 is formed, for example, by a manufacturing method described later using a liquid resin composition (acrylic emulsion) disclosed in Patent Document 1 (Japanese Patent Laid-Open No. 2017-36404). The thickness of the adhesive layer 13 is desirably 1 μm or more and 500 μm or less. If the lower limit of the layer thickness range is not reached, formation of the concave shape becomes difficult, or the size of the concave shape becomes too small, and the adhesion (adsorption) characteristics are deteriorated. Moreover, when the upper limit of the said layer thickness range is exceeded, the softness | flexibility of the adhesive sheet for building materials will fall, and workability | operativity will worsen.
Furthermore, in order to provide the concave shapes 13a evenly on both surfaces of the adhesive layer 13, the layer thickness t of the adhesive layer 13 is desirably in the range of 20 μm ≦ t ≦ 40 μm. This point will be described later.

The magnitude | size and density of the concave shape 13a of the adhesion layer 13 can be adjusted by changing the various conditions in the manufacturing process mentioned later. For example, the adhesive layer 13 can use the density of the adhesive layer 13 as an index representing the degree to which the concave shape 13a is included. Although it does not specifically limit as a density of this adhesion layer 13, For example, it can be 0.1 g / cm < ³ > or more and 0.6 g / cm < ³ > or less. Further, 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.

  The 2nd sheet | seat 14 which is a peelable base material sheet is the opposite side to the base material 11 of the adhesion layer 13 (it is a surface used as the lower side in FIG. 1, and this is also called the back surface side of the adhesion layer 13). Are stacked. The peelable substrate sheet 14 is provided in consideration of the handling properties until the building material pressure-sensitive adhesive sheet 1 is used. When the building material pressure-sensitive adhesive sheet 1 is used, that is, on the adherend 50, It peels when bonding the adhesive sheet 1 together. As the peelable substrate sheet 14, various forms such as a conventionally known release film, separate paper, separate film, separate paper, release film, release paper and the like can be appropriately used. For example, a high-quality paper, a coated paper, an impregnated paper, a plastic film or the like having a release layer formed on one side or both sides may be used. The release layer is not particularly limited as long as it has a releasability. For example, silicone resin, organic resin-modified silicone resin, fluororesin, aminoalkyd resin, melamine resin, acrylic resin, polyester resin, etc. Can be mentioned. These resins can be used in any of emulsion type, solvent type and solventless type. When a release film provided with 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.

For example, the thickness of the peelable substrate sheet 14 is preferably 10 μm or more and 100 μm or less, and more preferably 20 μm or more and 60 μm or less. Below the lower limit of the layer thickness range, there is no stiffness and it is difficult to peel off. Further, if the upper limit value of the layer thickness range is exceeded, stiffness is too strong and workability at the time of pasting is lowered.
Moreover, as the peelable substrate sheet 14, a commercially available product may be used. For example, a 38 μm-thick polyester film (Mitsui Chemicals Tosero Co., Ltd.) that has been easily peeled with a silicone-based release agent on one side. Manufactured, trade name: SP-PET-01) and the like.

FIG. 2 is a diagram sequentially illustrating the form of the building material pressure-sensitive adhesive sheet 1 in use.
The building material pressure-sensitive adhesive sheet 1 described above includes a peelable substrate sheet 14 as shown in FIG. When the building material pressure-sensitive adhesive sheet 1 is attached to the adherend 50, the peelable substrate sheet 14 is peeled (FIG. 2B). Then, by attaching the exposed adhesive layer 13 to the adherend 50 and applying an appropriate pressure to the surface thereof, a large number of concave shapes 13a existing on the exposed surface of the adhesive layer are elastically deformed, so that the conventional micro sucker It adheres (adheres) to the adherend 50 by the same action as in FIG. 2 (c).
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. By this force, the sealed space in the concave shape 13a becomes a negative pressure, and an adsorption action to the adherend 50 occurs. In addition, although the adsorption | suction force in the concave shape 13a single-piece | unit is weak, since many concave shape 13a is formed, the required adsorption | suction force can be ensured as a whole. In addition, when the pressure-sensitive adhesive layer 13 is manufactured, if the amount of the concave shape 13a is adjusted using, for example, the density as a parameter, the pressure-sensitive adhesive force (adsorptive power) of the pressure-sensitive adhesive layer 13 can be adjusted.

Next, the manufacturing method of the adhesive sheet 1 for building materials is demonstrated.
FIG. 3 is a diagram showing an apparatus for producing the building material pressure-sensitive adhesive sheet 1.
FIG. 4 is a diagram for explaining a method for producing the building material pressure-sensitive adhesive sheet 1.

  In order to manufacture the pressure-sensitive adhesive sheet 1 for building materials, first, the composition of the acrylic emulsion disclosed in Patent Document 1 for forming the pressure-sensitive adhesive layer 13 is put into a stirrer, and nitrogen gas is mixed into this composition. While stirring, the bubble-containing composition 130 is produced including bubbles in the composition (P1: foaming step in the figure).

  Next, the bubble-containing composition 130 is coated on the peelable substrate sheet (second sheet) 14 to form a liquid coating layer 130CL of the bubble-containing composition 130 (P2 in the drawing: coating step). . In the coating process, for example, a comma coater can be used, but other known coating methods may be used.

  When the liquid coating layer 130CL of the cell-containing composition is applied onto the peelable substrate sheet 14, the coating layer 130CL is dried while being heated to form the adhesive layer 13 as the solidified coating layer 130CS of the cell-containing composition. Form (P3 in the figure: drying step). In the drying step, for example, a drying furnace having a temperature of about 60 ° C. to 140 ° C. can be used. Examples of the drying time include about 30 seconds to 10 minutes. In the drying step, drying may be promoted while blowing air to the bubble-containing composition 130. By performing the drying process, the concave shape 13a is formed on both the exposed surface side (upper side in FIG. 4) of the solidified coating layer 130CS of the bubble-containing composition 130 and the peelable substrate sheet 14 (second sheet) side. Is formed, and the adhesive layer 13 is formed. The concave shape 13a is such that, in the bubbles contained in the bubble-containing composition 130, the bubbles in the vicinity of the exposed surface are broken and a part of the shape of the bubbles remains on the exposed surface side of the solidified coating layer 130CS. On the other hand, the interface shape between the solidified coating layer 130CS and the peelable substrate sheet 14 and the bubbles in the solidified composition are fixed by the solidification of the bubble-containing composition. It is formed by doing. Here, when bubbles are broken in a state where the curing of the bubble-containing composition 130 is insufficient, the concave shape 13a becomes difficult to remain. 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 process is performed under the condition that the bubble-breaking is performed in a state where the foam-containing composition 130 has been cured to some extent. Therefore, the temperature in the drying process and the air flow rate greatly affect the state of the concave shape 13a.

  After forming the adhesive layer 13 by a drying process, the surface layer sheet | seat (1st sheet) 10 provided with the base material 11 and the resin layer 12 which were prepared separately is joined with the adhesive layer 13 (P4 in a figure: Lamination process). In this laminating step, since the lamination is performed by the adsorption force (adhesive force) by the concave shape 13a of the adhesive layer 13, heating is unnecessary and the bonding is possible with a slight pressure. Therefore, the base material 11 and the resin layer 12 which are surface layer sheets are not damaged.

If the said lamination process is completed, the adhesive sheet 1 for building materials will be completed.
As described above, in the production of the building material pressure-sensitive adhesive sheet 1 of the present embodiment, the building material pressure-sensitive adhesive sheet 1 can be efficiently produced without damaging the surface layer sheet due to heat during the formation of the pressure-sensitive adhesive layer 13. The building material pressure-sensitive adhesive sheet may then be wound into a roll shape or cut into a required size.

Next, an example of actually producing the building material pressure-sensitive adhesive sheet 1 of the present embodiment is shown, and the results compared with the comparative example will be described.
In the building material pressure-sensitive adhesive sheet 1 of the example, the foam-containing composition 130 having been subjected to the foaming process was formed on a biaxially stretched PET film having releasability on the peelable substrate sheet 14 using a comma coater having a clearance of 200 μm. Applied. This was dried in a drying path at 100 ° C. for 1 minute to form an adhesive layer 13, and the surface layer sheet as the first sheet was laminated to obtain an adhesive sheet 1 for building materials. 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 building material pressure-sensitive adhesive sheet 1 of the example as viewed from the direction of the adherend.
FIG. 6 is an enlarged view of a cross-section in a direction perpendicular to the sheet surface of a portion near the adherend side of the pressure-sensitive adhesive layer 13 of the pressure-sensitive adhesive sheet 1 for building materials according to the example.
As shown in FIGS. 5 and 6, it can be confirmed that the adhesive layer 13 is formed with a large number of concave shapes 13 a.

As Comparative Example 1, a building material pressure-sensitive adhesive sheet was prepared in the same manner as in the above example except that only the foam was not performed. The density of the adhesive layer after production was 0.87 g / cm ³ and the thickness was 100 μm.
As Comparative Example 2, a building material pressure-sensitive adhesive sheet (acrylic pressure-sensitive A type) was prepared by using SK2094 made by Soken Chemical Co., Ltd., which is an acrylic resin.
As Comparative Example 3, a building material pressure-sensitive adhesive sheet (acrylic pressure-sensitive adhesive B type) was prepared by using SK1502C manufactured by Soken Chemical Co., Ltd., which is an acrylic resin.

The above four types of building material pressure-sensitive adhesive sheets were prepared, and the peel strength 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 the peeling force at that time by performing 180 ° peeling at a pulling speed of 300 mm / min using a tensile tester. Moreover, the measurement of peeling force was performed immediately after sticking (0.5 hours) and 1000 hours after sticking.

In the Examples, it can be seen that the film can be peeled off with a relatively small peeling force both immediately after pasting and after 1000 hours. With such a peeling force, it will not be peeled off naturally, and can be easily peeled off if a force is applied to try to peel it off. In addition, since it is adsorbed by the concave shape 13a, there is no residue of the adhesive layer 13 on the surface of the adherend 50 after peeling, and there is no substantial change in the adhesive force (peeling force) of the adhesive layer 13 itself. It was possible to paste.
In Comparative Example 1, a small piece can be peeled with a relatively small peeling force, but in the case of a large size, a certain amount of force was required for peeling. Further, after the peeling, an adhesive layer remained on the surface of the adherend, 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 off immediately after pasting, but after 1000 hours, the peeling force significantly increases. Therefore, it was difficult to peel off manually, or the surface layer sheet could be damaged if it was forcibly removed.
Comparative Example 1 could not generate an adsorption force.
In Comparative Example 2, it is easy to peel off immediately after pasting, but after 1000 hours, the peeling force has increased significantly, and it is difficult to peel off by hand. When peeled off, the surface layer sheet may be damaged.
In Comparative Example 3, the peel force was too large immediately after the attachment, and it was difficult to peel off manually, or the surface layer sheet could be damaged if peeled off forcibly.
Moreover, after peeling, neither Comparative Example 2 nor Comparative Example 3 was suitable for re-sticking because part of the adhesive material remained on the adherend or the adhesive strength was reduced. .

(Verification experiment on the concave shape 13a of the adhesive layer 13)
As described above, in the present invention, the concave shape 13a of the adhesive layer 13 greatly affects the adhesive force. If the concave shape 13a is not evenly provided on both surfaces of the adhesive layer 13, the adhesive force (adsorptive power) of one surface of the adhesive layer may be reduced or increased compared to the other surface. Further, by providing the concave shape 13a evenly on both surfaces of the pressure-sensitive adhesive layer 13, the physical properties of the pressure-sensitive adhesive layer 13 are also uniform, and the surface layer sheet (first sheet) and the peelable substrate sheet (second sheet), Or it is preferable also on the expression of sufficient adhesive force with respect to both a surface layer sheet | seat (1st sheet | seat) and a to-be-adhered body, and removability with an to-be-adhered body.

  In order to provide the concave shape 13a evenly on both surfaces of the adhesive layer 13, it is important to manage the application amount (layer thickness t) of the adhesive layer 13. In this regard, in Patent Document 1 (Japanese Patent Laid-Open No. 2017-36404), no consideration is given, and it is only necessary to form a micro suction cup. 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 sucker has a fine sucker structure. However, in the portion shown as the surface peeled from the glass substrate, a configuration that seems to be a huge bubble that cannot be compared 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 a micro suction cup (concave shape 13a) is formed on the other surface. Is not formed.

The applicant also conducted a verification experiment on this point.
As a verification experiment, four types of adhesive layer samples were prepared, and the concave shapes 13a on both sides thereof were observed with an SEM. There are the following four types of samples.
Sample 1: Adhesive layer thickness t = 25 μm
Sample 2: Layer thickness t = 30 μm of adhesive layer
Sample 3: Adhesive layer thickness t = 35 μm
Sample 4: Layer thickness of the adhesive layer t≈2000 μm
The layer thickness of the sample is the layer thickness after drying. Moreover, about the samples 1-3, the bubble containing composition after a foaming process was applied to the glass surface using the coater, and the drying process was performed using the 100 degree drying furnace. Sample 4 was dropped onto the glass surface and naturally dried at room temperature. The reason why the drying conditions were changed for sample 4 is to verify the description that normal temperature drying in Patent Document 1 is sufficient. Moreover, the density of the adhesion layer after a foaming process was 0.4 g / cm ³ in any sample.

FIG. 8 is a diagram illustrating an observation result of Sample 1. In FIG.
FIG. 9 is a diagram showing the observation result of Sample 2. In FIG.
FIG. 10 is a diagram showing the observation result of Sample 3. In FIG.
FIG. 11 is a diagram illustrating an observation result of the sample 4.
As shown in FIGS. 8 to 9, it was confirmed that the fine concave shapes 13a were uniformly formed on both surfaces of Sample 1 to Sample 3 in which the layer thickness t of the adhesive layer was controlled.
On the other hand, in the thick sample 4 shown in FIG. 11, an extreme difference is recognized in the size of the concave shape 13a between the dry surface and the glass side surface, and the same result as FIG. 2 of Patent Document 1 is obtained. It was.
Therefore, in order to uniformly provide the concave shapes 13a on both surfaces of the adhesive layer 13, it can be determined that the thickness t of the adhesive layer 13 is desirably in the range of 20 μm ≦ t ≦ 40 μm.

Here, in more detail, it is desirable that the concave shape 13a is provided on both sides of the pressure-sensitive adhesive layer 13 to satisfy the following relationship in more detail.
The average value of the diameter of each opening of the concave shape 13a that opens to the surface on the surface layer sheet (first sheet) side is D ^ave _1, and each of the concave shapes 13a that open to the peelable substrate sheet (second sheet) side When the average value of the diameters of the openings is 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 further desirable to satisfy this relationship.
By satisfying these relationships, the difference in adhesive strength between both surfaces of the adhesive layer can be reduced, and the surface layer sheet (first sheet) and the peelable substrate sheet (second sheet) or the surface layer sheet ( Adequate adhesive force to both the first sheet) and the adherend and removability from the adherend can be expressed well.
The average value of the diameters of the openings is practically impossible to determine the average of all the openings, and here, the openings having a large diameter within the observation range of 1500 μm × 1100 μm. The diameters of the three openings were measured in order, and the average value was obtained.

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.

(Building materials)
The building material pressure-sensitive adhesive sheet 1 of the present invention can constitute a building material by sticking it on various building members. The building material in the present invention is an interior material or exterior material of various buildings such as houses, stores, offices, etc., and is installed on the surface of the structural frame or skeleton of the building. Various materials, structures, and forms can be used as a building member to be affixed to the building material pressure-sensitive adhesive sheet of the present invention, that is, an adherend. As materials for building materials, wood, iron, copper, aluminum, titanium, or alloys containing these, such as cedar, bamboo, pine, lauan, etc., ceramics, porcelain, earthenware, various ceramics, cement, Ceramics-based non-metallic inorganic materials such as gypsum and calcium silicate, olefin-based resins, vinyl chloride-based resins, and other materials such as single or a mixture of two or more, mixed, and combined in other forms Can be used. As a structure and a form of a building member, a hollow or solid thing can be used with plates, such as a flat plate and a curved board, a polygonal column, a cylinder, and other various shapes. 8 and 9 illustrate an example of a building material 110 in which the building material pressure-sensitive adhesive sheet 1 of the present invention is attached to the surface of a building member (113, 121). However, the building material 110 of the present invention is not limited to these forms.
FIG. 8 is a diagram showing the building material 110 to which the building material pressure-sensitive adhesive sheet 1 of the present invention is attached.
In the example shown in FIG. 8, the building material pressure-sensitive adhesive sheet 1 is laminated on both sides of the building member of the panel 13 in which the plate-like body 112 is laminated on both the front and back sides of the frame 111. In the example of FIG. 8, the building material pressure-sensitive adhesive sheet 1 is laminated on both sides of the panel 13, but may be laminated only on one side. As what was made into the structure like FIG. 8, a door, a wall surface, a ceiling surface, a floor surface etc. can be illustrated, for example.

FIG. 9 is a view showing the building material 120 to which the building material pressure-sensitive adhesive sheet 1 of the present invention is attached.
FIG. 9 is an example in which the building material pressure-sensitive adhesive sheet 1 is affixed to a building material having a long length in the depth direction of FIG. Specifically, the pressure-sensitive adhesive for building material of the present invention is formed on the surface of the extrusion mold 121 formed of aluminum or the like, in which one side surface of the hollow prism is removed along the length direction with a constant width around the center. This is an example in which the sheet 1 is pasted.

  The shape of the extruded mold member 121 in FIG. 9 is an example, and other shapes may be used. The structure shown in FIG. 9 depends on the use of the extrusion mold 121 but is used for a frame of a door, a skirting board, a duck, a sill, a door itself such as a sliding door or a sliding door, a frame for attaching a door, etc. it can.

As described above, the building material pressure-sensitive adhesive sheet 1 of the present embodiment has a plurality of concave shapes based on bubbles formed on both surfaces of the pressure-sensitive adhesive layer 13. Therefore, it can be set as the adhesive sheet for building materials, without heating a surface layer sheet, and it can manufacture easily, without giving a damage to a surface layer sheet.
In addition, since the adhesive force of the adhesive layer 13 is due to the attractive force of the concave shape 13a, the reworkability is high, and even if the pasting fails, it is easy to reattach and easy to use.
Furthermore, since the concave shape 13a has a fine size and is provided in a large number, even if there are some irregularities on the surface of the adherend, an adhesive force (adsorption force) can be exhibited.
Furthermore, since a phenomenon such as adhesive residue does not occur on the surface of the adherend after peeling off the building material pressure-sensitive adhesive sheet 1, there is no need for cleaning, and re-adhesion can be performed as it is. Good properties.
Moreover, since the adhesive sheet 1 for building materials of this embodiment can form the adhesive layer 13 without heating, the adhesive sheet for building materials using the surface layer sheet | seat of various forms including the surface layer sheet weak to a heat | fever. Can be configured.

(Deformation)
The present invention is not limited to the embodiment described above, and various modifications and changes are possible, and these are also within the scope of the present invention.

(1) In the embodiment, the configuration of the surface layer sheet has been described with an example of a configuration including a base material and a resin layer. For example, the surface layer sheet may be a single layer or a more complicated configuration of three or more layers. Moreover, the raw material of the surface layer sheet may be composed of paper, a thermoplastic resin, or the like in addition to the examples given in the examples.

  Each embodiment and modification may be used in appropriate combination, but detailed description is omitted. Further, the present invention is not limited by the embodiments described above.

1 Building Material Adhesive Sheet 10 Surface Layer Sheet (First Sheet)
DESCRIPTION OF SYMBOLS 11 Base material 12 Resin layer 1a Irregular shape 13 Adhesive layer 13a Concave shape 14 Peelable base material sheet (2nd sheet)
50 Substrate 110, 120 Building material 130 Bubble-containing composition

Claims (9)

A first sheet;
An adhesive layer laminated on the back surface of the first sheet;
A second sheet laminated on the opposite side of the adhesive layer from the first sheet;
With
The adhesive layer is a building material adhesive sheet having a plurality of concave shapes on both sides thereof. In the adhesive sheet for building materials according to claim 1,
The concave shape is formed uniformly on both sides of the adhesive layer;
A pressure-sensitive adhesive sheet for building materials. In the building material pressure-sensitive adhesive sheet according to claim 2,
An average value of the diameters of the concave openings opening on the surface on the first sheet side is D ^ave _1, and an average value of the diameters of the concave openings opening on the second sheet side is D ^{When ave} ₂
| D ^ave ₁ −D ^ave ₂ | / D ^ave ₂ ≦ 0.5
Satisfying the relationship
A pressure-sensitive adhesive sheet for building materials. In the building material pressure-sensitive adhesive sheet according to any one of claims 1 to 3,
The thickness t of the adhesive layer is in the range of 20 μm ≦ t ≦ 40 μm,
A pressure-sensitive adhesive sheet for building materials. In the building material pressure-sensitive adhesive sheet according to any one of claims 1 to 4,
The adhesive layer has a plurality of the concave shapes based on the bubbles formed on both sides by drying the liquid resin composition including bubbles.
A pressure-sensitive adhesive sheet for building materials. In the building material pressure-sensitive adhesive sheet according to any one of claims 1 to 5,
The first sheet is a surface layer sheet that becomes a surface after pasting,
The second sheet is a peelable substrate sheet;
A pressure-sensitive adhesive sheet for building materials. In the adhesive sheet for building materials according to claim 6,
The adhesive layer is constituted by laminating the surface layer sheet after applying and drying a liquid resin composition on the peelable substrate sheet,
A pressure-sensitive adhesive sheet for building materials. In the building material pressure-sensitive adhesive sheet according to claim 6 or 7,
The surface sheet is made of paper or a thermoplastic resin;
A pressure-sensitive adhesive sheet for building materials.   A building material to which the building material pressure-sensitive adhesive sheet according to any one of claims 1 to 8 is attached.