JP2015189801A - adhesive sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an adhesive sheet which allows appropriate spreading of an adhesive layer on an adherend surface during pressing.SOLUTION: An adhesive sheet AS has an adhesive AD layer in which at least one of one side and the other side located on the side opposite to the one side serves as an adhesive surface. The adhesive AD layer includes a base part FA of a specified thickness and a protrusion part FB protruding from the base part FA and has an outer shape smaller than an adherend surface WA of an adherend WK, and the protrusion part FB has the same volume as that of an outer-edge space PC calculated by multiplying the area difference between the adherend surface WA and the base part FA by the thickness TA of the base part FA.

Description

  The present invention relates to an adhesive sheet.

Conventionally, the adhesive sheet which has an adhesive bond layer is known (for example, refer patent document 1).
The adhesive sheet described in Patent Literature 1 includes a sheet base material (base material), and a pressure-sensitive adhesive layer (adhesive layer) provided in a region inside the outer edge portion of one surface of the sheet base material, The pressure-sensitive adhesive layer extruded at the time of pressing can remain on the outer edge portion of the sheet base material.

JP 2007-178874 A

  However, the conventional adhesive sheet as described in Patent Document 1 does not consider the relationship between the size of the adherend surface of the adherend and the amount of the adhesive layer to be extruded. However, the adhesive layer may not protrude from the adherend surface, or the adhesive layer may not spread to the outer edge of the adherend surface.

  An object of the present invention is to provide an adhesive sheet that can spread an adhesive layer to an appropriate size with respect to an adherend surface during pressing.

  The adhesive sheet of the present invention includes an adhesive layer in which at least one of the one surface and the other surface located on the opposite side of the one surface is an adhesive surface, and the adhesive layer includes a predetermined layer. A base portion having a thickness and a protruding portion protruding from the base portion, and having an outer shape smaller than the adherend surface of the adherend, the protrusion portion being an area difference between the adherend surface and the base portion. It is characterized by being set to the same volume as the volume of the outer edge space multiplied by the thickness of the base.

  The adhesive sheet of the present invention includes an adhesive layer in which at least one surface of one surface and the other surface located on the opposite side of the one surface is an adhesive surface, and the adhesive layer has a predetermined plane. And having an outer shape smaller than the adherend surface of the adherend, and when the predetermined pressing force per unit area is applied to the whole, the protruding portion is crushed and predetermined The thickness is set so as to spread over the entire surface of the adherend.

In the adhesive sheet of the present invention, the adhesive layer includes one protrusion having one apex that can make point contact with the adherend, and the apex side is on the outer edge side at any position spaced from the apex. It is preferable that the thickness is greater than that.
In the adhesive sheet of the present invention, the adhesive layer includes one protrusion having one top line that can be in line contact with the adherend, and the top line side is located at any position apart from the top line. It is preferable that it is provided thicker than the outer edge side.

  According to the present invention, since the protruding portion of the adhesive layer is set to the same volume as the volume of the outer edge space, the adhesive layer is appropriately sized with respect to the adherend surface during pressing, that is, the same size as the adherend surface. Can be spread.

  Further, according to the present invention, the adhesive layer is set so that when the predetermined pressing force is applied to the entire unit area, the protruding portion is crushed and spreads over the entire adherend surface with a predetermined thickness. Therefore, the adhesive layer can be spread to an appropriate size with respect to the pair of adherend surfaces, that is, the same size as the adherend surfaces when pressed.

  Furthermore, if one protrusion having one apex or one top line is provided on the adhesive layer, the adhesive region between the adhesive layer and the adherend gradually spreads from the apex or top line to the outer edge side, The adhesive sheet can be attached so as to expel air. Also, the base material is hard and does not deform, the base material is difficult to deform, the base material is fragile and will be damaged, or the base material is fragile and may be damaged Even in such a case, the adhesive sheet can be stuck so as not to form air bubbles with the adherend while expelling air.

(A) is a perspective view of the adhesive sheet which concerns on 1st Embodiment of this invention, (B) is a side view of (A). The side view which shows the usage example of the adhesive sheet of FIG. (A) is a perspective view of the adhesive sheet which concerns on 2nd Embodiment of this invention, (B) is a side view of (A). The side view which shows the usage example of the adhesive sheet of FIG. The side view of the adhesive sheet which concerns on the modification of this invention.

Hereinafter, each embodiment of the present invention will be described with reference to the drawings.
Detailed description of the same configuration in each embodiment is omitted.
In each embodiment and modification, the X axis, the Y axis, and the Z axis are orthogonal to each other, the X axis and the Y axis are axes in a predetermined plane, and the Z axis is in the predetermined plane. The axes are orthogonal. Furthermore, in each embodiment and modification, when viewed from the direction of the arrow AR parallel to the Y axis, and when indicating the direction, “up” is the arrow direction of the Z axis and “down” is the opposite direction, “Left” is the arrow direction of the X axis, “Right” is the opposite direction, “Front” is the arrow direction of the Y axis, and “Back” is the opposite direction.

[First Embodiment]
In FIG. 1, an adhesive sheet AS is a double-sided adhesive sheet comprising an adhesive AD layer in which one surface is an adhesive surface SA1 and the other surface located on the opposite side of the one surface is an adhesive surface SA2. The adhesive surface SA2 is temporarily attached to the release sheet RL.

The adhesive AD layer includes a base FA having a predetermined thickness TA, a single vertex TP that can make point contact with the adherend WK, and a single protrusion FB protruding from the base FA. The outer shape is smaller than the adherend surface WA of the body WK, and the vertex TP side is thicker than the outer edge side at any position separated from the vertex TP. Examples of the base FA include those having a thickness of 1 μm to 5 mm.
The protrusion FB is set to the same volume as the volume of the outer edge space PS obtained by multiplying the area difference between the adherend surface WA and the base FA by the thickness of the base FA. Specifically, the protruding portion FB is formed in a substantially conical shape in which the vertex TP is located in the center of the adhesive AD layer and is inclined linearly in a side view from the vertex TP toward the outer edge side of the adhesive AD layer. ing. In addition, when the protruding portion FB has a conical shape and the adherend surface WA has a circular shape, the protruding portion FB has a volume VL calculated by the following formula (1) and is a vertex in the protruding portion FB. The height HT of TP is calculated by the following formula (2). In addition, the height HT of the vertex TP in the protrusion part FB can be exemplified by a height that is 1 μm to 5 mm higher than the lowermost part of the protrusion part FB.

VL = π × (RB ² −RA ² ) × TA (1)
HT = 3 × (RB ² −RA ² ) × TA ÷ RA ² (2)
TA: thickness of base FA RA: radius of adhesive AD layer RB: radius of adherend surface WA

  The above-described adhesive AD layer is configured to exhibit fluidity when pressed against the adherend WK, and is formed so that the protrusions FB are leveled to have a substantially uniform thickness (substantially equal). ing. This adhesive AD layer is composed of, for example, an acrylic, rubber-based, or silicon-based pressure-sensitive adhesive, and examples thereof have a thickness of 1 μm to 5 mm.

Hereinafter, a procedure for attaching the adhesive sheet AS to the adherend WK will be described.
First, as shown by the solid line in FIG. 2A, the adhesive sheet AS is supported from the release sheet RL side by the support surface 21 of the support means 20. Then, the adherend surface WA of the adherend WK and the support surface 21 are disposed substantially in parallel, and the support means 20 and the adherend WK are relatively moved in a direction substantially perpendicular to the support surface 21, and FIG. ) As shown by the middle two-dot chain line, the vertex TP is brought into contact with the adherend surface WA. Thereafter, the adhesive AD layer is gradually applied toward the outer edge while the protrusion FB is crushed by the relative movement between the support means 20 and the adherend WK. Then, when the protrusions FB are all crushed, the adhesive AD flows, and as shown in FIG. 2 (B), when the outer edge space PS is completely filled, the support means 20 and the adherend WK are relative to each other. Stop moving. Here, since the protruding portion FB is set to the same volume as the volume of the outer edge space PS, the adhesive AD layer is leveled by the thickness TA. Then, when sticking adhesive surface SA2 on another to-be-adhered body, as shown in FIG.2 (C), peeling sheet RL is peeled from adhesive sheet AS.

  According to the embodiment as described above, since the protruding portion FB of the adhesive AD layer is set to the same volume as the volume of the outer edge space PS, the adhesive AD layer is suitable for the adherend surface WA when pressed. It can be spread to the same size, that is, the same size as the adherend surface WA.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIG.
The adhesive sheet AS of the present embodiment is different from the first embodiment in that the first protrusions FC1 and the second protrusions FC2 are provided and the configurations of the protrusions FC1 and FC2.

The adhesive AD layer is provided on one surface of the base FA and the base FA, and has one top line TL that can make line contact with the adherend surface WA1 of the first adherend WK1 as the adherend. 1st protrusion part FC1 and 1 2nd protrusion which has one top line TL which is provided in the other surface of base FA, and can be in line contact with adherend surface WA2 of 2nd adherend WK2 as an adherend The top line TL side is provided thicker than the outer edge side at any position spaced apart from the top line TL.
The first protrusion FC1 is a surface where two surfaces are connected at a predetermined angle so that the top line TL passes through the center of the adhesive AD layer and is inclined linearly from the top line TL toward the outer edge side in a side view. It has.
Since the second protrusion FC2 has the same configuration as the first protrusion FC1, the description thereof is omitted.
Here, the total volume of the first protrusion FC1 and the second protrusion FC2 is set to the same volume as the volume of the outer edge space PS obtained by multiplying the area difference between the adherend surface WA1 and the base FA by the thickness TA of the base FA. Has been. The adherend surfaces WA1 and WA2 have the same shape. Further, the material and thickness of the adhesive AD layer, the thickness TA of the base FA, and the height HT of the top line TL in each of the protrusions FC1 and FC2 can be the same as those in the first embodiment.

Hereinafter, a procedure for attaching the adhesive sheet AS to the first adherend WK1 and the second adherend WK2 will be described. In addition, as shown to FIG. 4 (A), as for adhesive sheet AS, 2nd protrusion part FC2 is temporarily attached to peeling sheet RL which has recessed part RL1 dented in the shape corresponding to 2nd protrusion part FC2.
First, the adhesive sheet AS is supported from the release sheet RL side by the support surface 21 of the support means 20. Then, the support means 20 and the first adherend WK1 are relatively moved in the same manner as in the first embodiment, and as shown in FIG. 4A, the top line TL of the first protrusion FC1 is attached to the adherend surface WA1. Abut. Thereafter, the adhesive AD layer is gradually stuck toward the outer edge while the first protrusion FC1 is crushed by the relative movement between the support means 20 and the first adherend WK1. When the first protrusion FC1 is crushed, as shown in FIG. 4B, the adhesive AD flows, and when all of the first protrusion FC1 are crushed, the first protrusion FC1 is crushed. The relative movement with respect to one adherend WK1 is stopped. At this time, the adhesive AD layer spreads to such an extent that it does not reach the outer edge of the adherend surface WA1.

  Next, as shown in FIG. 4C, the release sheet RL is peeled from the adhesive AD layer by a peeling means (not shown) such as a hand or a suction pad. Then, the support means 22 supporting the second adherend WK2 with the support surface 23 is arranged so that the adherend surface WA2 and the support surface 23 are substantially parallel, and the support means 22 is in a direction substantially orthogonal to the support surface 23. And the second adherend WK2 are moved relative to each other, and as shown in FIG. 4D, the top line TL of the second protrusion FC2 is brought into contact with the adherend surface WA2. Thereafter, the adhesive AD layer is gradually applied toward the outer edge while the second protrusion FC2 is crushed by the relative movement between the support means 22 and the second adherend WK2. When the second protrusion FC2 is crushed, as shown in FIG. 4E, the adhesive AD flows, and when all of the second protrusion FC2 is crushed, the second protrusion FC2 is crushed. The relative movement with respect to one adherend WK1 is stopped. Here, since the total volume of the first protrusion FC1 and the second protrusion FC2 is set to the same volume as the volume of the outer edge space PS, the adhesive AD layer is leveled by the thickness TA. .

According to the embodiment as described above, the same effect as that of the first embodiment can be obtained.
Further, the second adherend WK2 can be attached to the first adherend WK1 via the adhesive sheet AS.

  As described above, the best configuration, method and the like for carrying out the present invention have been disclosed in the above description, but the present invention is not limited to this. That is, the invention has been illustrated and described with particular reference to certain specific embodiments, but without departing from the spirit and scope of the invention, Various modifications can be made by those skilled in the art in terms of material, quantity, and other detailed configurations. In addition, the description of the shape, material, and the like disclosed above is exemplary for ease of understanding of the present invention, and does not limit the present invention. The description by the name of the member which remove | excluded the limitation of some or all of such restrictions is included in this invention.

  For example, in the first and second embodiments, when a predetermined pressing force per unit area is applied to the entire adhesive sheet AS, each protrusion FB, FC1, FC2 is crushed to fill each outer edge space PS, You may set so that the adhesive agent AD layer may spread over the to-be-adhered surface WA, WA1, WA2 by predetermined thickness TA. The predetermined pressing force per unit area may be, for example, a pressing force of about 100 KPa to 300 KPa, but it may be less or more than that.

  Further, as shown in FIG. 5, the adhesive AD layer includes protrusions FB, FC1, and FC2 that protrude with respect to a predetermined plane, and adherends WA, WA1, and WA2 of the adherends WK, WK1, and WK2. When a predetermined pressing force is applied to the entire unit area, the protruding portions FB, FC1, and FC2 are crushed and have a predetermined thickness TB as shown by a two-dot chain line in FIG. May be set so as to spread over the entire surfaces of the adherends WA, WA1, WA2. The predetermined pressing force per unit area may be, for example, a pressing force of about 100 KPa to 300 KPa, but it may be less or more than that. Even in such a case, the same effect as described above can be obtained. In this case, the adhesive AD layer may or may not have the base FA. For example, when the adhesive AD layer does not have the base FA and the protrusion FB has a conical shape, the adherend surface WA. When the thickness of the adhesive AD layer when spreading over the entire surface of WA1, WA2 is TB, the height HT of the vertex TP in the protruding portion FB is calculated by the following formula (3).

HT = 3 × RB ² × TB ÷ RA ² (3)

  Further, the adhesive AD layer shown in FIG. 5 includes projecting portions FB, FC1, and FC2 projecting with respect to a predetermined plane, and has the same outer shape as the adherend surfaces WA, WA1, and WA2 of the adherends WK, WK1, and WK2. When a predetermined pressing force is applied to the entire unit area, the protrusions FB, FC1, and FC2 are crushed and applied with a predetermined thickness TB as shown by a two-dot chain line in FIG. WA, WA1, WA2 may be set so as to spread over the entire surface.

In addition, the protrusion FB may be formed in a substantially quadrangular pyramid shape in which the vertex TP is located in the center of the adhesive AD layer and is inclined linearly or curvedly in a side view or a front view from the vertex TP in front, back, left, and right. Good. The protruding portion FB may have a substantially triangular pyramid shape, or may have a substantially pentagonal pyramid shape such as a substantially pentagonal pyramid, a substantially hexagonal pyramid, etc., and the shape is not limited. Further, the adherends WA, WA1, WA2 may also be pentagons or more such as triangles, pentagons, hexagons, etc., or may be elliptical or other shapes, and the shapes are not limited at all.
Furthermore, the protruding portion FB may be formed in a substantially cone shape or a pyramid shape having a curved shape in which the inclined surface is curved in a concave shape or a convex shape in a side view.
In addition, the first and second protrusions FC1 and FC2 have a top line TL that passes through the center of the adhesive AD layer, and is linear from the top line TL in at least one of the left and right and front and rear directions in a side view or a front view. A plurality of inclined surfaces that are inclined in a curved line or a polygonal line may be provided.
Further, the top line TL may be bent or bent in a bent line shape when viewed from the front (viewed from the X-axis direction in FIG. 3), or may be bent or bent in a plan view (viewed from above in FIG. 3). It may be bent.

Further, each of the protrusions FB, FC1, FC2 may have an arcuate top portion as a vertex TP or a top line TL in a side view.
Furthermore, each protrusion FB, FC1, FC2 may be at a position where the vertex TP is deviated from the center of the adhesive AD layer, or the top line TL is deviated from a position passing through the center of the adhesive AD layer. Alternatively, the vertex TP or the top line TL may be at the edge of the adhesive AD layer.
Moreover, each protrusion part FB, FC1, FC2 may be formed in the shape of a broken line with the inclined surface bent into a concave shape or a convex shape in a side view.
Further, the adhesive AD layer may be configured to exhibit fluidity by applying an external force such as heating or cooling or to improve fluidity. In this case, the adherends WK, WK1, WK2 When the adhesive sheet AS is pressed, the adhesive sheet AS may be heated by an appropriate heating means or cooled by an appropriate cooling means.
Further, the thickness of the adhesive AD layer, the base FA, and the protrusions FB, FC1, and FC2 may be equal to or greater than the above-described exemplary thickness in light of technical common sense.

Furthermore, the adhesive sheet AS is formed in an annular shape having a through hole having a predetermined shape such as a circle or a polygon at the center, and the top line of the annular adhesive layer is a circular or polygonal top line TL. You may provide the inclined surface which inclines in the shape of a straight line, a curve, or a polygonal line by the side view from the line TL to an inner edge and an outer edge, respectively.
Further, the adhesive sheet AS may be provided with any one of the above-described protrusions FB, FC1, FC2 on one surface of the base FA, and any one of the above-mentioned protrusions FB, FC1, FC2 on the other surface. The upper and lower surfaces may be protrusions having the same shape, or may be protrusions having different shapes. The adhesive sheet AS may be adhesive layers having the same composition on the upper and lower surfaces, or may be adhesive layers having different compositions. In addition, any of the protrusions FB, FC1, and FC2 described above may be provided on the opposite side of the protrusions FB, FC1, and FC2 without providing the base FA.
Further, the adhesive sheet AS is provided with one of the above-described protrusions FB, FC1, FC2 on one surface of the base FA, and paper, resin, rubber, wood, metal, ceramics, glass, stone, etc. on the other surface. You may provide the comprised base material. Moreover, you may provide a base material in the other side of protrusion part FB, FC1, FC2 without providing base FA. In addition, as a base material, what has a thickness of 1 micrometer-100 mm can be illustrated, However, It may be more or less.
Further, the adhesive sheet AS may be an ellipse, a polygon such as a triangle or a pentagon, and other irregular shapes, or may have a shape different from the shapes of the adherends WK, WK1, and WK2.

  In addition, the material, type, shape, and the like of the adhesive sheet AS and the adherends WK, WK1, and WK2 in the present invention are not particularly limited. For example, the adhesive sheet AS may be a circle, an ellipse, a polygon such as a triangle or a quadrangle, or other shapes, or may be of an adhesive form such as pressure sensitive adhesive or heat sensitive adhesive, When the heat-sensitive adhesive sheet AS is employed, it may be bonded by an appropriate method such as providing a heating means such as an appropriate coil heater or heat pipe for heating the adhesive sheet AS. Further, the adhesive sheet AS may be, for example, one having two or more layers, such as one having an intermediate layer in the base FA, or having a cover layer on the upper surface of each protrusion FB, FC1, FC2. Moreover, as each adherend WK, WK1, WK2, for example, food, resin containers, semiconductor wafers such as silicon semiconductor wafers and compound semiconductor wafers, information recording substrates such as circuit boards and optical disks, glass plates, steel plates, pottery, Arbitrary forms of members and articles such as wood boards or resin boards can also be targeted. In addition, the adhesive sheet AS is replaced with a functional and intended reading, for example, any information label, decorative label, protective sheet, dicing tape, die attach film, die bonding tape, recording layer forming resin sheet, etc. Arbitrary sheets, films, tapes and the like can be attached to any adherend as described above.

AD Adhesive AS Adhesive Sheet FA Base FB Protrusion FC1 First Protrusion (Protrusion)
FC2 second protrusion (protrusion)
PS Outer edge space TL Top line SA1, SA2 Adhesive surface TP vertex WA, WA1, WA2 Adhered surface WK Adherent WK1 First Adherent (Adherent)
WK2 second adherend (adherent)

Claims (4)

An adhesive layer in which at least one surface of one surface and the other surface located on the opposite side of the one surface is an adhesive surface;
The adhesive layer includes a base portion having a predetermined thickness and a protruding portion protruding from the base portion, and has an outer shape smaller than the adherend surface of the adherend,
The adhesive sheet according to claim 1, wherein the protrusion is set to have the same volume as an outer edge space obtained by multiplying an area difference between the adherend surface and the base by a thickness of the base. An adhesive layer in which at least one surface of one surface and the other surface located on the opposite side of the one surface is an adhesive surface;
The adhesive layer is provided with a protruding portion that protrudes with respect to a predetermined plane, has an outer shape smaller than the adherend surface of the adherend, and when a predetermined pressing force is applied to the entire unit area, An adhesive sheet, wherein the protrusion is set so as to be crushed and spread over the entire adherend surface with a predetermined thickness.   The adhesive layer includes one protrusion having one apex that can make point contact with the adherend, and the apex side is provided thicker than the outer edge side at any position spaced from the apex. The adhesive sheet according to claim 1, wherein the adhesive sheet is provided.   The adhesive layer includes one projecting portion having one top line that can be in line contact with the adherend, and the top line side is thicker than the outer edge side at any position separated from the top line. The adhesive sheet according to claim 1, wherein the adhesive sheet is provided on the adhesive sheet.

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