JPH0848951A - Production of tearable double-coated self-adhesive tape, easily stickable double-coated self-adhesive tape, and peelable double-coated self-adhesive tape - Google Patents

Abstract

PURPOSE:To prepare a double-coated self-adhesive tape which has a good tearability, i.e., is easily torn by hand without roughening the cut section. CONSTITUTION:This double-coated self-adhesive tape is prepd. by forming self-adhesive layers 4, 4 on both sides of an entirely embossed synthetic resin film 20. The emboss pattern of the film 20 comprises many checkerwise arranged dents 21 each of which is in a shape of an inverse quadrangular pyramid and is so arranged that the directions of ridgelines mutually crossing at right angle in the pyramid are almost the same as the machine and cross directions of the film.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double-sided pressure-sensitive adhesive tape having good hand-cutting properties, an easily-adhesive double-sided pressure-sensitive adhesive tape capable of preventing the formation of an air layer between the adherend and the tape at the time of application, and re-peeling. The present invention relates to a method for producing a double-sided adhesive tape having good properties.

[0002]

2. Description of the Related Art Conventionally, paper, nonwoven fabric or synthetic resin film is used as a base material for a double-sided adhesive tape which has been used for adhesion of general notices and various materials. In the case of using paper or non-woven fabric, there is a problem that the cut surface is not aligned although it has a hand-cutting property that can be cut by hand at a desired position. Further, in the case of using a synthetic resin film which is advantageous in terms of moisture proof and waterproof, it is difficult to cut by hand, so that it is cut using a tool such as a tape cutter. It should be noted that a synthetic resin film is used as a base material.
The base material described in JP-A-4-7300 has an ethylene component of 3.
There is known a pressure-sensitive adhesive tape which contains 5 to 15% by weight and is molecularly oriented by uniaxially stretching in the transverse direction by a factor of 4 or more. However, none of the double-sided pressure-sensitive adhesive tapes having a synthetic resin film as a base material have good hand tearability.

Conventionally, since the double-sided adhesive tape using a synthetic resin film as a base material is not air-permeable, the end portions are first attached so that air does not enter between the adherend and the tape at the time of attachment. There is a problem in that it is complicated because it is attached while the air is expelled from its end by hand or a jig.

In addition, in the usage form of the double-sided adhesive tape for posting, only one side of the adhesive side has a first adherend (for example,
After making it adhere to the bulletin board) and peeling off the second adherend (for example, a poster, etc.) adhered to the adhesive surface on the other side,
Another double adherend (for example, another poster or the like) is reattached and used, or the double-sided adhesive tape itself is adhered to the other surface from the first adherend (for example, bulletin board). In addition to the second adherend (for example, a poster), the adhesive may be peeled off without leaving the first adherend (for example, a bulletin board) in preparation for the next use. ,
What is used for such an application is called a removable double-sided pressure-sensitive adhesive tape. This double-sided removable pressure-sensitive adhesive tape has a pressure-sensitive adhesive on one side and a weak pressure-sensitive adhesive on the other side, and the production method is as follows: Different adhesives were applied in the step. Therefore, there is a problem that the process becomes complicated, and there has been a demand for a manufacturing method in which the coating process can be completed with one kind of adhesive.

[0005]

SUMMARY OF THE INVENTION The present invention is intended to solve the above problems, and an object of the present invention is to easily cut by hand and to cut without roughening the cut surface. It is an object of the invention of claim 2 to provide an easily attachable double-sided adhesive tape in which air is unlikely to enter between the adherend and the tape during application. Therefore, an object of the invention of claim 3 is to provide a method for producing a removable double-sided pressure-sensitive adhesive tape which is simple in production method.

[0006]

The hand-cuttable synthetic resin film according to claim 1 is a double-sided pressure-sensitive adhesive tape comprising a synthetic resin film having one surface embossed and pressure-sensitive adhesive layers provided on both sides. The embossing is formed by a large number of inverted quadrangular pyramid-shaped recesses, and the directions of the ridge lines of the inverted quadrangular pyramid that are orthogonal to each other are approximately aligned with the longitudinal and lateral directions of the synthetic resin film, and are arranged in a checkered pattern. It is characterized by becoming.

In the easily attachable double-sided pressure-sensitive adhesive tape according to claim 2, the synthetic resin film and the pressure-sensitive adhesive layers provided on both sides thereof are embossed to form a concave portion, and the synthetic resin film is formed in the concave portion. And through holes penetrating the pressure-sensitive adhesive layers on both sides thereof.
The method for producing a removable double-sided pressure-sensitive adhesive tape according to claim 3, wherein a large number of quadrangular pyramid-shaped projections are provided on the other surface of the synthetic resin film having an adhesive layer provided on one surface thereof. The directions of the ridges that are orthogonal to each other are approximately the same as the longitudinal and lateral directions of the synthetic resin film, and embossing is performed by embossing rolls arranged in a checkered pattern, and the synthetic resin film is formed by the tips of the convex portions of the quadrangular pyramid shape. A method is characterized in that a through hole is provided, and then pressure is applied in the surface direction of the synthetic resin film to allow a part of the adhesive to pass through the through hole and be exposed on the other surface.

The synthetic resin film used in the invention of claim 1 is a medium or low pressure polyethylene, a high pressure polyethylene, a linear low density polyethylene, polypropylene, a polyolefin resin such as an ethylene-vinyl acetate copolymer, or 2 of these. Mixtures of more than one kind, soft vinyl chloride resin,
Examples thereof include those generally used as a film or sheet such as polyimide resin.

The entire surface of one side of the synthetic resin film is embossed with a recess. The embossing is formed as a large number of inverted quadrangular pyramid-shaped recesses, and this shape may be either an inverted regular quadrangular pyramid with a square base or an inverted quadrangular pyramid with a rhombus base. The size of the emboss is 0.05 mm to 1 in terms of the length of the diagonal line at the base of the inverted quadrangular pyramid.
About 0 mm is preferable. Further, it is preferable that the embosses have the same size.

The embossing is such that the directions of the ridges of the inverted quadrangular pyramids that are orthogonal to each other are substantially aligned with the longitudinal and lateral directions of the film, that is, the width direction and the longitudinal direction, and are arranged in a checkered pattern. Therefore, the bottom corners of each inverted quadrangular pyramid are close to or in contact with each other, and their ridge lines are arranged in a continuous or continuous straight line. If one of the embosses is torn at one end of the film, the tear will proceed along the thinned portion of the film, or the ridge of the emboss. Since the ridgelines of adjacent embossments are arranged in a continuous or continuous straight line, the film is linearly torn along the ridgelines of the inverted quadrangular pyramid. Therefore, even a film molecularly oriented by stretching can be easily cut by hand in the direction perpendicular to the stretching direction.

Further, since the embosses are arranged in a checkered pattern, the outer side of the base of the inverted quadrangular pyramid is a film of the original thickness that is not embossed, and the delamination occurs from the portion where the embosses are close to or in contact with each other. There is no danger of spreading to parts.

To emboss in the shape of an inverted quadrangular pyramid as described above, an embossing roll having a convex portion in which a plurality of quadrangular pyramids are arranged in contact with their bases is used, and the heights of the quadrangular pyramids are compared. When the embossing of the inverse quadrangular pyramid shape is made so that the bottom part of each inverse quadrangular pyramid is in contact with each other, the ridge lines are continuous straight lines. line up. On the other hand, when the height of the quadrangular pyramid is increased so that the portion between the apex and the base is embossed, the obtained inverse quadrangular pyramid-shaped embossment is
The bottom corners of each inverted quadrangular pyramid are close to each other, and their ridges are arranged in a continuous straight line.

An adhesive layer is provided on both sides of the embossed surface of the hand-cuttable synthetic resin film. As the pressure-sensitive adhesive used for the pressure-sensitive adhesive layer, those used as a usual double-sided pressure-sensitive adhesive tape or sheet can be applied, and examples thereof include an acrylic pressure-sensitive adhesive and a rubber-based pressure-sensitive adhesive.

In the method for producing the above-mentioned hand-cuttable double-sided pressure-sensitive adhesive tape, only the synthetic resin film may be embossed to make it hand-tearable, and then the pressure-sensitive adhesive layer may be laminated on both sides thereof. After laminating the adhesive layer on one side,
The synthetic resin film layer may be embossed to make it hand-tearable, and then an adhesive layer may be laminated on the embossed surface to form a double-sided adhesive tape.

The synthetic resin film and the pressure-sensitive adhesive used in the easily attachable double-sided pressure-sensitive adhesive tape according to claim 2 are the same as those described in claim 1.

In the double-sided pressure-sensitive adhesive tape according to the second aspect, the synthetic resin film and the pressure-sensitive adhesive layers provided on both sides thereof are embossed. The emboss is not particularly limited as long as it forms a recess, and examples thereof include an inverted polygonal pyramid and an inverted conical shape. In particular, an inverted quadrangular pyramid-shaped recess similar to that of the first aspect is more preferable because hand-cutability is also imparted.

In the double-sided pressure-sensitive adhesive tape according to the second aspect, the recess is further provided with holes penetrating the synthetic resin film and the pressure-sensitive adhesive layers on both sides thereof. The shape of the hole can be various shapes such as a circular shape, a rhombus shape, a quadrangular shape, and a triangular shape, and the size thereof is 30 to 300 in diameter or long side length.
μm is preferred. When the size of the pores is small, air easily enters between the adherend and the tape at the time of sticking, and when the size is large, the strength of the double-sided pressure-sensitive adhesive tape decreases.

In the above-mentioned method for producing an easily attachable double-sided adhesive tape, a pressure-sensitive adhesive layer is provided on both sides of a synthetic resin film, and a release paper is laminated on the surface of the pressure-sensitive adhesive layer, and a convex portion having protrusions is formed. There is a method in which embossing is performed using the formed embossing roll, and at the same time when the embossing is applied, holes are formed by the projections to penetrate the synthetic resin film and the pressure-sensitive adhesive layers on both sides thereof. The embossing roll on which the convex portion having the above-mentioned projection is formed is preferably one having a convex portion such as a polygonal pyramid or a cone shape, and these have a pointed apex to be a projection, so that they are penetrated by the projection. You can make holes.

The synthetic resin film used in the method for producing the removable double-sided pressure-sensitive adhesive tape according to claim 3 is the same as that according to claim 1.

The pressure-sensitive adhesive used in the method for producing the removable double-sided pressure-sensitive adhesive tape according to claim 3 preferably has a slightly high fluidity. For example, no crosslinking agent is used or the amount of the crosslinking agent used is Acrylic pressure-sensitive adhesives (including macromonomer type) or rubber-based pressure-sensitive adhesives that are lower than usual are preferable. Examples of acrylic adhesives include Soken Chemical Co., Ltd., trade name: S-59, and examples of macromonomer type acrylic adhesives include Soken Chemical Co., Ltd., trade name: SK-1697. To be

In the method for producing a removable double-sided pressure-sensitive adhesive tape according to claim 3, first, a large number of quadrangular pyramid-shaped projections are formed on the other surface of the synthetic resin film having a pressure-sensitive adhesive layer provided on one surface thereof. The directions of the ridges orthogonal to each other of the pyramids substantially match the longitudinal and lateral directions of the synthetic resin film, and embossing is performed by embossing rolls arranged in a checkered pattern, and the apex portions of the quadrangular pyramid-shaped convex portions Through holes are provided in the synthetic resin film.

The quadrangular pyramid may be a regular quadrangular pyramid having a square base or a rhomboidal quadrangular pyramid.
The size of the quadrangular pyramid is preferably about 0.5 mm to 10 mm in terms of the length of the diagonal line at the base of the quadrangular pyramid, and the height of the quadrangular pyramid may be higher than the thickness of the synthetic resin film.

The through-hole has a substantially circular shape, and its diameter is preferably 30 to 300 μm. When the diameter of the through hole is small, it becomes difficult for the pressure-sensitive adhesive to pass through the through hole, and when it is large, the strength of the double-sided pressure-sensitive adhesive tape is reduced.

Then, pressure is applied in the surface direction of the synthetic resin film to allow a part of the adhesive to pass through the through hole and to be exposed on the other surface. The above pressure is preferably 10 g weight / cm ² or more. The pressure of the pressure-sensitive adhesive may be room temperature, but heating the pressure-sensitive adhesive accelerates the movement. The heating temperature is preferably 40 to 80 ° C, and the heating time is 1 to 72
Time is preferred.

[0025]

In the double-sided self-cutting adhesive tape according to claim 1, when one of the embosses is torn at one edge of the film, the ridge lines of adjacent embosses are arranged in a continuous or continuous straight line. Cleavage proceeds along the ridgeline of the inverted quadrangular pyramid of the embossed portion, that is, along the ridgeline of the inverted quadrangular pyramid, and the film is linearly cleaved in either the vertical or horizontal direction. In addition, since the embosses are arranged in a checkerboard pattern, the outer side of the base of the inverted quadrangular pyramid is the film of the original thickness that is not embossed, and the tear spreads from the part where the embosses are close to or in contact with each other to the other part. There is no fear. Even a film molecularly oriented by stretching can be easily cut by hand in the direction perpendicular to the stretching direction.

In the easily attachable double-sided pressure-sensitive adhesive tape according to claim 2, when the tape is adhered to an adherend, the air entered between the adherend and the tape is a synthetic resin film provided in the recess. Since it can be discharged from the through-holes that penetrate the pressure-sensitive adhesive layers on both sides thereof, entrapment of air at the time of sticking is prevented.

According to the method for producing a removable double-sided pressure-sensitive adhesive tape according to claim 3, the synthetic resin film having an adhesive layer on one surface is embossed on the surface of the synthetic resin film to form an inverted quadrangular pyramid-shaped embossed portion. By forming a through hole and then applying pressure in the surface direction of the synthetic resin film, the adhesive passes through the through hole, and the embossed part of the inverted quadrangular pyramid is filled with the adhesive and double-sided adhesive It becomes a tape.
The obtained double-sided pressure-sensitive adhesive tape has a strong adhesive layer on one side because the entire surface is covered with the pressure-sensitive adhesive, and a weak pressure-sensitive adhesive layer on the other side because only the inverted quadrangular pyramid-shaped embossed portion is filled with the pressure-sensitive adhesive, so it is removable again. It becomes suitable as a double-sided adhesive tape.

[0028]

Embodiments of the present invention will be described below with reference to the drawings. The following Example 1 and Comparative Examples 1 and 2 are
The double-sided self-adhesive double-sided adhesive tape according to claim 1, Example 2 and Comparative example 3 are the easily attachable double-sided adhesive tape according to claim 2, and Example 3 is the removable double-sided adhesive tape according to claim 3. The present invention relates to a manufacturing method. (Example 1) FIG. 1 is a cross-sectional view showing an example of the double-sided self-adhesive pressure-sensitive adhesive tape 1 according to claim 1, which is a polyethylene film 20 having a thickness of 120 μm (trade name: P manufactured by Sekiryo Co., Ltd.
E-12) is embossed with an inverted regular pyramid shape,
Reference numeral 21 indicates a concave portion, and 22 and 23 indicate ridge lines. Acrylic pressure-sensitive adhesive layers 4 and 4 are 40 μm on both sides of the embossed polyethylene film 20.
And a double-sided release paper 5 is laminated on the pressure-sensitive adhesive layer 4 on the opposite side of the embossed surface of the pressure-sensitive adhesive layer 4.

FIG. 2 is a plan view showing a part of the embossed synthetic resin film 2 used for the above-mentioned hand-cuttable double-sided adhesive tape 1. One embossed film is provided on one side of a polyethylene film 20 having a thickness of 120 μm. Is embossed with a concave portion 21 having an inverse regular quadrangular pyramid shape. The recess 2
The size of 1 is about 100 μm on the diagonal of the base of the inverted regular pyramid.
And the depth is about 80 μm. Such a recess 21
Is the orthogonal direction of the ridge lines 22 and 23 of the inverted regular pyramid, that is, the ridge line 2
2 are aligned in the vertical direction YY of the polyethylene film 20, and the ridge lines 23 are aligned in the horizontal direction XX, and are arranged in a checkered pattern. Further, 24 is a flat surface of the film which is not embossed.

The hand-cut double-sided pressure-sensitive adhesive tape 1 is manufactured as follows. FIG. 3 is a plan view showing, on an enlarged scale, a part of the surface of the embossing roll 3 having a diameter of 280 mm, in which the lengths of the diagonal lines 32 and 33 of the base are 1 mm each,
The protrusion 31 made of a regular quadrangular pyramid having a vertex height of 800 μm forms one diagonal line 33 in the axial direction AA of the embossing roll 3.
Are arranged in a checkered pattern so that the surface temperature of the embossing roll 3 is 12
It is heated to 5 to 130 ° C. Moreover, 34 is a flat part without a convex part of an embossing roll.

FIG. 4 is an explanatory view for explaining a method of manufacturing the above-mentioned hand-cuttable double-sided adhesive tape 1. Double-sided release paper 5
Acrylic adhesive (solid content 40%, Soken Chemical Co., Ltd. trade name: S-59) and isocyanate curing agent (solid content 55%, Nippon Polyurethane Industry Co., Ltd. trade name: Coronate L55E) are mixed on one side of the mixture ratio. The pressure-sensitive adhesive solution mixed at 100: 1 was applied so that the thickness after drying was 40 μm, and dried to form the pressure-sensitive adhesive layer 4, and the pressure-sensitive adhesive layer 4 had a thickness of 120.
A polyethylene film 20 of μm was attached to obtain a single-sided adhesive tape raw material 6.

The obtained single-sided pressure-sensitive adhesive tape raw sheet 6 was treated with 10 m /
While sending in minutes, 70 ℃ in advance by a heating device (not shown)
After heating, the single-sided adhesive tape raw fabric 6 is pressed and softened by a distance of about 30 cm so that the surface of the embossing roll 3 is in contact with the surface of the polyethylene film 20 and is fed. The polyethylene film 20 is embossed by pressing it with a pinch roll 7 made of rubber so that the embossing depth becomes about 80 μm, and after passing through a cooling roll 8, it is wound up to obtain an embossed single-sided adhesive tape raw fabric 6. It was

On the other hand, the acrylic pressure-sensitive adhesive layer 4 is formed on the process paper in the same manner as described above, and the pressure-sensitive adhesive layer 4 is transferred to the embossed surface of the above-mentioned embossed single-sided adhesive tape raw sheet 6 and hand-cut. A double-sided pressure-sensitive adhesive tape 1 was obtained.

Comparative Example 1 Instead of the polyethylene film 20 in Example 1, a nonwoven fabric (thickness 82 μm, basis weight 32 g / m ² , manufactured by Dexter Miki Co., Ltd., trade name: DM-
3882) was used and no embossing was applied to obtain a double-sided pressure-sensitive adhesive tape in the same manner as in Example 1.

Comparative Example 2 A double-sided pressure-sensitive adhesive tape was obtained in the same manner as in Example 1 except that embossing was not applied.

Performance Evaluation Using the double-sided pressure-sensitive adhesive tapes obtained in Example 1 and Comparative Examples 1 and 2, the following hand-cutting test was conducted. Test Method The test method is shown in FIGS. A sample 100 was obtained by cutting the tape along the longitudinal direction (direction indicated by an arrow in FIG. 5) to a width of 25 mm, and a reinforcing tape was applied to a portion 101 from one end of the sample 100 in the width direction to 3 mm. As the tape 200, a tape having a width of 25 mm was attached from both the front and back sides, and then a slit 201 having a length of 25 mm was made in the width direction at substantially the center in the longitudinal direction of the reinforcing tape 200 (see FIG. 5). One of the reinforcing tapes 200 thus divided into two was fixed to the upper chuck of the tensile tester and the other was fixed to the lower chuck, and the sample 100 was torn at a tensile speed of 1000 mm / min (see FIG. 6), and the load at that time was applied. It was measured. The test was repeated 3 times, and the average value was taken as the hand tearability.

Test Results The double-sided pressure-sensitive adhesive tape of Example 1 has a hand tearability of 80 g, and those of Comparative Examples 1 and 2 are 120 g and 3, respectively.
It was 90 g. Further, the shape of the cut surface was such that the double-sided pressure-sensitive adhesive tape of Example 1 was cut perpendicularly to the longitudinal direction of the tape (A in FIG. 7), but that of Comparative Example 1 was the cutting start portion of the tape. Only in the vicinity was cut perpendicularly to the longitudinal direction, but other parts were not cut perpendicularly (B in FIG. 7). Was not cut vertically (C in FIG. 7).

(Example 2) FIG. 8 is a sectional view showing an example of the easily-adhesive double-sided adhesive tape 9 according to claim 2, which is a polyethylene film 20 having a thickness of 120 μm (trade name: PE- manufactured by Sekiryo Packaging Co., Ltd.). 12) both sides of which are provided with acrylic pressure-sensitive adhesive layers 4 and 4 having a thickness of 40 μm as in Example 1, and release papers 5 and 5 are further provided on the surfaces of the adhesive layers 4 and 4 to form a polyethylene film. 20 and the acrylic pressure-sensitive adhesive layers 4 and 4 on both sides thereof and the release paper 5 on one side are embossed in the shape of an inverted regular pyramid as in Example 1.
However, the embossing was made deeper than in Example 1, and the tip of the concave portion 21 penetrated the acrylic pressure-sensitive adhesive layer 4 to reach a part of the other release paper 5 and the adhesive layer 4 had a thickness of 200 μm. A circular through hole 41 having a diameter of is formed.

The easy-adhesive double-sided pressure-sensitive adhesive tape 9 was produced as follows. FIG. 9 is an explanatory view for explaining a method for manufacturing the above-mentioned easily attachable double-sided adhesive tape 9. A pressure-sensitive adhesive solution similar to that used in Example 1 was applied to the release surface of the release paper 5 so that the thickness after drying was 40 μm, and dried, and then the thickness 1
Stick it with a 20 μm polyethylene film 20,
A one-sided adhesive tape was obtained. On the other hand, the same adhesive solution as above is applied to the release surface of another release paper 5 so that the thickness after drying becomes 40 μm, and after drying, the surface of the polyethylene film 20 of the above single-sided adhesive tape is bonded, A double-sided adhesive tape 91 was obtained.

While feeding the obtained double-sided adhesive tape 91 at a rate of 10 m / min, the double-sided adhesive tape 91 was preheated to 70 ° C. by a heating device (not shown), and then the double-sided adhesive tape 91 was applied to the same embossing roll 3 as in Example 1. A distance of 30 cm is pressed and sent while softening, and pressed on the surface of the embossing roll 3 by a pinch roll 7 made of the same urethane rubber as in Example 1 to form a through hole 41 on the double-sided adhesive tape 91 at the same time as embossing. After passing through the cooling roll 8, it was wound up to obtain a double-sided pressure-sensitive adhesive tape 9 that was easily attached.

Comparative Example 3 A double-sided pressure-sensitive adhesive tape was obtained in the same manner as in Example 2 except that embossing was not applied.

Performance Evaluation Using the double-sided pressure-sensitive adhesive tapes obtained in Example 2 and Comparative Example 3, the following stickability test was conducted. Test method A 100 mm x 100 mm double-sided adhesive tape was attached to a glass plate by hand. Then, the area of the air portion sandwiched between the tape and the glass plate was measured, and the area ratio of the air existing portion was calculated by the following formula. Air-existing part area ratio (%) = [sum of area of air part / sample area] × 100 test result The air-existing part area ratio (%) is 0% in the double-sided adhesive tape of Example 2, and is a comparative example. 10% with adhesive tape of 3
Met.

Example 3 An acrylic adhesive (solid content 40%, manufactured by Soken Chemical Co., Ltd., trade name: S on one side of double-sided release paper
-59) is applied so that the thickness after drying is 40 μm,
A pressure-sensitive adhesive layer is formed by drying, and the pressure-sensitive adhesive layer has a thickness of 120 μm.
A polyethylene film of m 2 (corona treatment degree 40 to 45 dyne, product name: PE-12 manufactured by Sekiryo Packing Co., Ltd.) was attached to obtain a single-sided adhesive tape raw fabric.

FIG. 10 is an explanatory view for explaining a method of manufacturing the removable double-sided pressure-sensitive adhesive tape 10. The single-sided adhesive tape raw fabric 6 was heated at 70 ° C. in advance by a heating device (not shown) while sending the single-sided adhesive tape raw fabric 6 at 10 m / min. The surface of the polyethylene film is brought into contact with the surface of the polyethylene film, and is fed while being softened by pressing it at a distance of about 30 cm, and is pressed on the surface of the embossing roll 3 by the pinch roll 7 made of the same urethane rubber as in Example 1 to form one surface. Raw adhesive tape 6
Polyethylene film with a diameter of 2 at the same time as embossing
Removable double-sided pressure-sensitive adhesive tape 10 provided with a substantially circular through hole of 00 μm, wound with a tension such that the stress after winding was 80 gf / cm ^2, and then left at 60 ° C. for 48 hours.
I got

As shown in FIG. 11, the removable double-sided pressure-sensitive adhesive tape 10 comprises a double-sided release paper 5 on which the pressure-sensitive adhesive layer 4 and a polyethylene film 20 are laminated in this order, and the polyethylene film 20 is embossed in an inverted quadrangular pyramid shape. The through hole 41 is formed in the bottom of the recess 21, and the recess 21 is filled with a part of the adhesive 4a of the adhesive layer 4. In addition, the above-mentioned removable double-sided adhesive tape 1
0 is as shown in FIG. 12 when viewed from the embossed surface side.
It can be seen that the concave portion 21 formed by embossing is filled with the adhesive 4a in the adhesive layer 4.

Performance test The releasable double-sided pressure-sensitive adhesive tape obtained in Example 3 was 25 mm.
The product was cut into widths, and in accordance with JISZ 0237, a stainless steel plate was used as a test plate, and the adhesive strength of the adhesive transfer surface and the embossed surface was peeled off from the stainless steel plate by 180 degrees, and the adhesive strength was measured. As a result, the 180-degree peeling adhesive force was 1000 g / 25 mm for the adhesive transfer surface,
The embossed surface was 200 g / 25 mm.

[0047]

The structure of the double-sided self-adhesive pressure-sensitive adhesive tape according to the first aspect of the invention is as described above. As the dehiscence progresses along the pyramid ridge, and the embossed ridges are arranged in a continuous or continuous straight line,
The film is linearly cleaved along the ridgeline of the inverted pyramid in any direction, vertical or horizontal. Also, since the embosses are arranged in a checkerboard pattern, the outer side of the base of the inverted quadrangular pyramid is the film of the original thickness that is not embossed, and the tear spreads from the part where the embosses are close to or in contact with each other. There is no fear. Further, even an oriented film can be easily cut by hand without using a tool and without roughening the cut end. Moreover, since the step of stretching the film is not required in the production, the production can be efficiently performed.

The structure of the easily attachable double-sided pressure-sensitive adhesive tape according to the second aspect of the present invention is as described above, and when the tape is adhered to an adherend, the air that has entered between the tape and the adherend is recessed. The air can be prevented from being entrapped at the time of sticking, because it can be discharged from the through-holes provided in the through hole penetrating the synthetic resin film and the pressure-sensitive adhesive layers on both surfaces thereof. The constitution of the removable double-sided pressure-sensitive adhesive tape according to claim 3 is as described above, and a double-sided pressure-sensitive adhesive tape having two different front and back adhesive strengths can be obtained by one-step application similar to the method for producing a single-sided pressure-sensitive adhesive tape. be able to. Therefore, the manufacturing process is simplified and the manufacturing can be performed efficiently.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of the hand-cuttable double-sided adhesive tape according to claim 1.

FIG. 2 is a plan view showing a part of an embossed synthetic resin film used in the hand-cuttable double-sided adhesive tape of FIG.

FIG. 3 is a partially enlarged plan view of an embossing roll.

FIG. 4 is an explanatory diagram for explaining a method for manufacturing a double-sided adhesive tape that can be cut by hand.

FIG. 5 is an explanatory diagram for explaining a method of a hand-cutability test.

FIG. 6 is an explanatory diagram for explaining a method of a hand-cutability test.

FIG. 7 is a plan view showing the shape of a cut surface.

FIG. 8 is a cross-sectional view showing an example of an easily attachable double-sided adhesive tape.

FIG. 9 is an explanatory diagram for explaining a method for manufacturing an easily attachable double-sided adhesive tape.

FIG. 10 is an explanatory diagram for explaining a method for manufacturing a removable double-sided pressure-sensitive adhesive tape.

FIG. 11 is a cross-sectional view showing an example of a removable double-sided pressure-sensitive adhesive tape.

FIG. 12 is a plan view of the removable double-sided pressure-sensitive adhesive tape as viewed from the embossed surface side.

[Explanation of symbols]

 1 Hand-cut double-sided adhesive tape 2 Embossed synthetic resin film 3 Embossing roll 4 Adhesive layer 4a Adhesive 5 Release paper 6 Single-sided adhesive tape original 7 Pinch roll 8 Cooling roll 9 Easy-adhesive double-sided adhesive tape 10 Removable Double-sided adhesive tape 20 Polyethylene film 21 Recessed portions 22, 23 Ridge line 24 Flat surface 31 Convex portion 32, 33 Diagonal line 34 Flat portion 41 Through hole 91 Double-sided adhesive tape

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location C09J 7/02 JKM JKP B29C 59/04 C 9446-4F

Claims (3)

[Claims] 1. A double-sided pressure-sensitive adhesive tape comprising a synthetic resin film, one surface of which is embossed, and pressure-sensitive adhesive layers provided on both surfaces, wherein the embossment is formed of a large number of inverted quadrangular pyramid-shaped recesses, A hand-cut double-sided pressure-sensitive adhesive tape, characterized in that the directions of the ridge lines of the inverted quadrangular pyramid that are orthogonal to each other are substantially aligned with the longitudinal and lateral directions of the synthetic resin film, and are arranged in a checkered pattern. 2. A synthetic resin film and a pressure-sensitive adhesive layer provided on both sides thereof are embossed to form recesses, and the recesses penetrate through the synthetic resin film and the pressure-sensitive adhesive layers on both sides thereof. An easily-adhesive double-sided pressure-sensitive adhesive tape characterized by being provided with. 3. A synthetic resin film having a pressure-sensitive adhesive layer provided on one surface thereof, and a plurality of pyramid-shaped projections on the other surface of the synthetic resin film. The embossing rolls are substantially aligned with each other and are arranged in a checkerboard pattern, and the synthetic resin film is provided with through holes by the tip portions of the quadrangular pyramid-shaped projections.
Then, a pressure is applied in the surface direction of the synthetic resin film to allow a part of the adhesive to pass through the through hole and to be exposed on the other surface.