KR20200062358A - Adhesive tape - Google Patents

Abstract

A pressure-sensitive adhesive tape having a pressure-sensitive adhesive layer on at least one side of a substrate, as well as a pressure-sensitive adhesive portion (2), as well as a non-adhesive portion (1) partially in a desired pattern shape (preferably comprising a rubber-based pressure-sensitive adhesive), the pressure-sensitive adhesive layer being Disclosed is a pressure-sensitive adhesive tape made of a solid pressure-sensitive adhesive composition and having a thickness of 0.03 to 0.6 mm. This adhesive tape is excellent in peeling workability, and can be suitably used even when there is a place where the adhesive does not want to be brought into contact with the adherend, and also has excellent properties such as surface adhesion, water resistance, and cold resistance.

Description

Adhesive tape {ADHESIVE TAPE}

The present invention is useful for applications such as, for example, a masking tape for rough surface coating, has excellent peeling workability, and also has good surface adhesion, water resistance, cold resistance, and the like. It relates to an adhesive tape having excellent medicinal properties.

Conventionally, an adhesive tape having a non-adhesive portion in an adhesive layer has been used for various purposes. For example, in Patent Documents 1 to 6, a masking tape for painting is described, and it has been described that the adhesive tape is liable to peel off by using a non-adhesive portion as a gripper. Patent document 7 describes a side-end non-coated adhesive tape, and by using a non-adhesive portion, the pressure-sensitive adhesive is easily re-released and re-attached to the adherend. It is explained that it is paid. Patent Document 8 describes an adhesive tape used to bind relatively light weight items such as a bunch of vegetables or a plastic bag containing food, and an adhesive tape for binding that can be easily cut with a finger in a longitudinal direction and an orthogonal direction. It has been described that it is provided in order to make it easy to perform a detaching operation by placing a finger on the non-adhesive portion when removing the adhesive tape. On the other hand, in Patent Document 9, a masking tape for decoration is described, and by providing a non-adhesive portion at the center, it is described that a space in the shape of a cylinder or a bag that does not come into contact with the adhesive can be formed and an object can be inserted therein. . In addition, Patent Document 10 describes a masking adhesive tape used for masking extra solder when bonding a target material of a sputtering target and a backing plate material with solder, and for removing air from the non-adhesive part. It is explained that it is used as a passage. Moreover, Patent Document 11 describes an adhesive tape for a battery, and is described as providing a non-adhesive portion at both edge portions of the base material in order to prevent it from coming out from the base material.

As the pressure-sensitive adhesive used in such pressure-sensitive adhesive tapes, particularly solvent-based pressure-sensitive adhesives have been proposed (Patent Documents 5, 6, 7, 8, 11). However, the solvent-based pressure-sensitive adhesive needs to be thinned because the thickening of the pressure-sensitive adhesive layer causes foaming or the like in the heating and drying process. In this case, it becomes difficult for the adherend to adhere to a rough surface such as a road. In addition, the workability in a high place such as a ceiling or a scaffold becomes difficult because the adhesiveness is low if the pressing force is not applied. In addition, since the adhesion to water-soaked parts and the adhesion at low temperatures are low, it becomes difficult to work in rainy weather or in winter and cold regions. Moreover, in the conventional adhesive tape, further improvement of peeling workability is also required.

[Patent Document 1] Publication of Japanese Utility Model Publication No. 04-15318 [Patent Document 2] Japanese Utility Model Publication No. 59-176678 [Patent Document 3] Japanese Utility Model Publication No. Hei 03-94969 [Patent Document 4] Japanese Utility Model Publication No. 06-077852 [Patent Document 5] Japanese Utility Model Publication No. 59-61880 [Patent Document 6] Japanese Patent Publication 2014-173038 [Patent Document 7] Japanese Patent Publication No. 2000-309762 [Patent Document 8] Japanese Patent Publication No. 2004-10760 [Patent Document 9] Japanese Utility Model Registration No. 3152945 [Patent Document 10] Japanese Patent Publication 2003-286568 [Patent Document 11] Japanese Patent Publication No. 2013-064086

The object of the present invention is excellent in peeling workability, and can be suitably used even when there is a place where no adhesive is to be brought into contact with the adherend, and also has excellent properties such as surface adhesion, water resistance, and cold resistance. In providing an adhesive tape.

The present inventors conducted a careful study to achieve the above object, and found that it is very effective to use a solid adhesive composition to form a relatively thick specific thickness of the pressure-sensitive adhesive layer where the non-adhesive portion is partially present. The invention has been completed.

That is, the present invention is an adhesive tape having an adhesive layer in which a non-adhesive portion is partially present on at least one side of a substrate, the adhesive layer is composed of a solid adhesive composition, and the thickness of the adhesive layer is 0.03 to 0.6 It is an adhesive tape which is mm.

Since the pressure-sensitive adhesive tape of the present invention has a pressure-sensitive adhesive layer having a relatively thick specific thickness in which a non-adhesive portion is partially present using a solid pressure-sensitive adhesive composition, it is excellent in peeling workability, and also has various properties such as surface adhesion, water resistance, and cold resistance. This is excellent.

1 is a schematic plan view showing an embodiment of the adhesive tape of the present invention.
2 is a schematic plan view showing an embodiment of the adhesive tape of the present invention.
It is a schematic top view which shows one Embodiment of the adhesive tape of this invention.
4 is a schematic plan view showing an embodiment of the adhesive tape of the present invention.
It is a schematic diagram for demonstrating the loop tack test in a reference example.
[Fig. 6] Fig. 6 is a schematic view for explaining air shape deformation described in Examples and Comparative Examples.

1 is a schematic plan view showing an embodiment of the adhesive tape of the present invention. In this embodiment, the non-adhesive portion 1 and the pressure-sensitive adhesive portion 2 are alternately formed in an oblique stripe shape. Therefore, since a gripping zone exists on either a part or a side surface of the cut end face of the adhesive tape, it is easy to peel from either side. Moreover, when the pattern consisting of the non-adhesive portion 1 and the adhesive portion 2 is wound into an adhesive tape to form a roll product, all or the difference in the tape thickness between the non-adhesive portion and the adhesive portion or It is a part offset pattern, and since the pressure due to the presence of the adhesive is not concentrated in a specific place with respect to the winding direction, the cut surface of the adhesive tape is clean, the outer peripheral surface of the roll product is relatively smooth, and unwinding is unlikely to occur. Each of these points will be described in detail in Examples described later.

2 is a schematic plan view showing one embodiment of the adhesive tape of the present invention. In this embodiment, the non-adhesive portion 1 is provided parallel to the width direction of the tape. Therefore, the gripper is present on the side surface of the adhesive tape, so it is easy to peel off from the side surface. In addition, when cutting at the non-adhesive portion 1, it is easy to peel from the cut end face. Moreover, the pattern consisting of the non-adhesive portion 1 and the adhesive portion 2 is a pattern in which all or part of the difference in tape thickness between the non-adhesive portion and the adhesive portion is offset when the adhesive tape is wound to form a roll product, Since the winding pressure is not concentrated with respect to the winding direction, the cutting surface of the adhesive tape is clean, the outer peripheral surface of the roll product is relatively smooth, and unwinding is unlikely to occur. Each of these points will be described in detail in Examples described later. In addition, for example, by adjusting the width of the non-adhesive portion 1, the non-adhesive portion 1 is brought into contact with the object that goes directly to the tape, and the pressure-sensitive adhesive portion 2 is brought into contact with the member around the object, thereby bringing the adhesive to the object. It can also be fixed without attaching.

3 is a schematic plan view showing an embodiment of the adhesive tape of the present invention. In this embodiment, the non-adhesive portion 1 is provided at both end portions along the longitudinal direction of the adhesive tape. Therefore, since the gripping zones are present at both end portions and side surfaces of the cut section of the adhesive tape, it is easy to peel from either side. In addition, for example, in the case of installation for simple fixing of the object, the non-adhesive portion 1 at both ends can be picked up and installed simply.

4 is a schematic plan view showing an embodiment of the adhesive tape of the present invention. In this embodiment, the non-adhesive portion 1 is provided in the central portion along the longitudinal direction of the adhesive tape. Therefore, the gripper is present in the center of the cut end face of the adhesive tape, so it is easy to peel from the cut end face. Also, for example, in the case of use in the packaging of a packaging box such as a cardboard box, if the central non-adhesive portion 1 is cut with a cutter at the time of opening the box, the adhesive does not adhere to the cutter. . In addition, even if a gap occurs in the packaging area by the cardboard box, the adhesive does not adhere to the contents.

Among the embodiments of Figs. 1 to 4 described above, the embodiment of Fig. 1 is most preferable from the viewpoint of being able to be easily peeled off in both the vertical and horizontal directions. However, the pattern of the non-adhesive part 1 and the adhesive part 2 in this invention is not limited to embodiment of FIGS. 1-4. For example, it is possible also in various other patterns, such as a dot shape, a lattice shape, a random image, and the shape which gave designability.

In the present invention, the thickness of the pressure-sensitive adhesive layer is 0.03 to 0.6 mm, preferably 0.04 to 0.4 mm, more preferably 0.05 to 0.4 mm, particularly preferably 0.06 to 0.25 mm. It is preferable to thicken the pressure-sensitive adhesive layer as in the present invention, in particular, properties such as adhesion to rough surfaces such as roads, water resistance, and cold resistance are improved. In addition, thickening the pressure-sensitive adhesive layer as in the present invention is preferable also in that the non-adhesive portion 1 is prevented from being crushed by an external force such as pressurization, and maintains good peeling workability, and furthermore, the pressure-sensitive adhesive is brought into contact with the pressure-sensitive adhesive. It is also preferable from the point of making sure that there is no contact in the case where there is an undesired location. It is difficult to form such a thick adhesive layer with a solvent-based adhesive composition.

The pressure-sensitive adhesive layer is a layer made of a solid pressure-sensitive adhesive composition. The solid pressure-sensitive adhesive composition is a pressure-sensitive adhesive composition that does not substantially contain a solvent, a so-called cost-based pressure-sensitive adhesive composition, and the expression "solid pressure-sensitive adhesive composition" includes a hotmelt pressure-sensitive adhesive. The solid adhesive composition preferably contains a rubber-based adhesive, and in particular, thermoplastic rubbers such as natural rubber, styrene-butadiene rubber, and styrene-based block copolymers, synthetic isoprene rubber, butyl rubber, polyisobutylene rubber, acrylic rubber, and nitrile rubber It is more preferable to include rubber components, such as polyisobutylene rubber and recycled rubber. Moreover, it is also preferable that the solid adhesive composition contains inorganic fillers, such as calcium carbonate, zinc oxide, and titanium oxide. The content of the inorganic filler is preferably 30 to 200 parts by mass based on 100 parts by mass of the rubber component. Moreover, if necessary, you may contain well-known additives, such as a tackifier, process oil, an anti-aging agent, an ultraviolet stabilizer, a vulcanizing agent, and a coloring agent.

The adhesive tape of this invention has the adhesive layer demonstrated above on at least one side of a base material. The type of the substrate is not particularly limited. For example, rayon, cotton, polyester alone or blended yarns, long fibers such as polyester or acrylic, and woven or knitted fabrics, such as polyethylene plated yarns, polypropylene, polyethylene, etc. And resin films. Especially, woven fabric or knitted fabric is preferable. The thickness of the base material is preferably 0.05 to 0.3 mm, more preferably 0.1 to 0.2 mm.

The adhesive tape of the present invention can be obtained by coating a solid adhesive composition in a desired pattern on a substrate using, for example, a coating device such as a calender roll or a hot melt coater.

Although the adhesive tape of the present invention can be used without limitation for various uses, it is particularly excellent in peeling workability, and also has excellent properties such as surface adhesion, water resistance, and cold resistance, so that it is used for peeling after use, for example, road It is very useful for applications such as masking tape for rough coating of walls, etc. It is also useful as a temporary fixing and temporary fixing tape for various processes in high places, scaffolds, cold areas, wet places, and the like. In addition, utilizing the characteristic configuration that the non-adhesive portion 1 is partially present in the pressure-sensitive adhesive layer, it can be used for applications such as simple handles, handles, book covers, wire fixing of hypotheses, and decorative chains.

[Example]

Hereinafter, the present invention will be described in more detail by examples. In the following description, "part" means "part by mass".

<Evaluation test of adhesive>

The adhesive tapes of the following Reference Examples 1 to 7 and Comparative Reference Examples 1 to 3 were produced, and the adhesive was evaluated by the following methods. The results are shown in Tables 1 and 2.

[Reference Example 1]

A polyethylene layer was laminated on one surface of the soup woven fabric (a surface opposite to the surface forming the adhesive layer), and a long chain alkyl-based release material was applied on the polyethylene layer to obtain a substrate having a thickness of 0.15 mm. On the other hand, 100 parts of natural rubber, 150 parts of calcium carbonate, 100 parts of tackifying resin (manufactured by Japan Corporation, Quinton (registered trademark) R100), and 30 parts of process oil were kneaded with a pressure kneader to obtain a solid adhesive composition. This solid pressure-sensitive adhesive composition was applied to the entire surface of one side of the substrate with a calendar roll, and an adhesive layer having a thickness of 0.04 mm was formed to obtain an adhesive tape.

[Reference Example 2]

An adhesive tape was produced in the same manner as in Reference Example 1, except that the thickness of the adhesive layer was changed to 0.06 mm.

[Reference Example 3]

An adhesive tape was produced in the same manner as in Reference Example 1, except that the thickness of the adhesive layer was changed to 0.11 mm.

[Reference Example 4]

A polyethylene layer was laminated on one surface of the soup woven fabric (the surface opposite to the surface forming the adhesive layer), and a long chain alkyl-based release material was applied on the polyethylene layer to obtain a substrate having a thickness of 0.21 mm. On the other hand, 100 parts of natural rubber, 120 parts of calcium carbonate, 85 parts of tackifying resin (manufactured by Nippon Corporation, Quinton (registered trademark) G115) and 20 parts of process oil were kneaded with a pressure kneader to obtain a solid adhesive composition. This solid pressure-sensitive adhesive composition was applied to the entire surface of one side of the substrate with a calendar roll, and an adhesive layer having a thickness of 0.04 mm was formed to obtain an adhesive tape.

[Reference Example 5]

An adhesive tape was produced in the same manner as in Reference Example 4, except that the thickness of the adhesive layer was changed to 0.11 mm.

[Reference Example 6]

An adhesive tape was produced in the same manner as in Reference Example 4, except that the thickness of the adhesive layer was changed to 0.15 mm.

[Reference Example 7]

An adhesive tape was produced in the same manner as in Reference Example 4, except that the thickness of the adhesive layer was changed to 0.23 mm.

[Comparative Reference Example 1]

A polyethylene layer was laminated on both sides of the polyethylene woven fabric, and a long-chain alkyl-based release material was applied on one polyethylene layer (the polyethylene layer on the opposite side to the surface forming the adhesive layer) to obtain a substrate having a thickness of 0.125 mm. On the other hand, 20 parts of butyl acrylate, 77 parts of 2-ethylhexyl acrylate, and 3 parts of acrylic acid were dissolved in a solvent, polymerized using 2,2'-azobis (isobutyronitrile) as an initiator, and solid content was 50%. The base polymer was obtained. To 100 parts of this base polymer, 1 part of an isocyanate curing agent (manufactured by Sokeng Chemical Co., Ltd., trade name L-45) was added and stirred to obtain a solvent-based pressure-sensitive adhesive composition. This solvent-based pressure-sensitive adhesive composition was applied and dried on the entire surface of one side of the substrate with a roll coater, and an adhesive layer having a thickness of 0.02 mm was formed to obtain an adhesive tape.

[Comparative Reference Example 2]

An adhesive tape was produced in the same manner as in Comparative Reference Example 1, except that the amount of 2-ethylhexyl acrylate was changed to 79 parts and the amount of acrylic acid to 1 part.

[Comparative Reference Example 3]

In Comparative Reference Example 2, when an attempt was made to change the thickness of the pressure-sensitive adhesive layer to 0.11 mm, an appropriate pressure-sensitive adhesive tape could not be produced because the pressure-sensitive adhesive composition foamed.

[adhesiveness]

The adhesive force of the adhesive tape with a width of 25 mm to the SUS plate was measured according to JIS ZZ 0237 (2000).

[Adhesion to rough surface]

The rough surface of the road and the like was assumed, and a test plate was prepared in which ＃400 abrasive paper was fixed to the SUS plate. In accordance with JIS ZZ 0237 (2000), the adhesive force of the test plate of the 25 mm wide adhesive tape to the abrasive surface was measured.

[Inclined 30° tack]

In accordance with JIS ZZ0237 (2000), the inclination of the adhesive tape was measured at 30° by a 30° inclined ball tack test.

[Loop Tech]

As shown in Fig. 5, a loop of 100 mm in circumference was formed with the base 3a of the adhesive tape 3 having a width of 25 mm inside and the adhesive layer 3b outside. Hold both ends with the chuck (4) of the measuring instrument, and lower it to the height of 20 mm between the edge of the chuck of the measuring instrument and the SUS plate (5) at a speed of 300 mm/min, the same speed without delay The adhesive force when raised to the original position was measured. This roof tech is an adhesiveness test assuming a state in which a pressing force is not applied.

[Adhesion to wet surface]

Assuming the rough surface of the road, etc., a test plate was prepared in which ＃280 abrasive paper was fixed to the SUS plate (polished side up). The test piece was immersed in water for 3 minutes, then taken out, the test plate was shaken by hand to remove water droplets, and then the adhesive force of the 25 mm wide adhesive tape to the test plate was measured according to JIS 　Z　0237 (2000).

[Static load peeling in low temperature environment]

Assuming the use in a cold climate, the static load peeling measurement was performed in an atmosphere of -20°C. The test tape was adhered to an area of 25 mm wide by 50 mm long, and a 300 g weight was hung on the SUS plate specified in JIS #Z0237 (2000). The distance peeled off in one minute was measured, or the time was measured when all peeled off within one minute.

[Residual solvent]

The residual solvent in the pressure-sensitive adhesive layer was volatilized by a head space method (heating condition: 80°C, 40 minutes) using gas chromatography manufactured by Shimadzu Corporation, and the amount of residual solvent detected was measured.

<Evaluation result of adhesive>

As is evident from the results shown in Table 1, most of the items of the pressure-sensitive adhesive layer made of the solid pressure-sensitive adhesive composition of the pressure-sensitive adhesive tapes of Reference Examples 1 to 7 were excellent. For example, it is possible to understand that it is possible to obtain a sufficient fixing force for normal roads and wet roads because it has excellent adhesion to normal rough surfaces and rough surfaces that are not sufficiently dry after rain, and excellent slope 30° and roof tecs are excellent. It can be understood that sufficient fixing force can be obtained even without crimping, and it is possible to understand that it is difficult to peel off even at the low temperature environment due to excellent static load peeling, and it is difficult to cause environmental pollution due to less residual solvent. have.

On the other hand, in the pressure-sensitive adhesive layer composed of the solvent-based pressure-sensitive adhesive composition of the pressure-sensitive adhesive tapes of Reference Comparative Examples 1 to 2, most of the items were inferior to Reference Examples 1 to 7. For example, one of the reasons why the adhesive force, tex, and static load peeling is inferior is that the thickness of the adhesive layer is thinner than those of Reference Examples 1 to 7. On the other hand, in Reference Comparative Example 3, an attempt was made to set the thickness of the pressure-sensitive adhesive layer to 0.11 mm, which is the same as that of Reference Examples 3 and 5, but the solvent-based pressure-sensitive adhesive composition was foamed and an appropriate pressure-sensitive adhesive tape could not be produced. When the solvent-based pressure-sensitive adhesive composition is used as described above, it is difficult to increase the thickness of the pressure-sensitive adhesive layer.

<Evaluation test of peeling workability>

The adhesive tapes of Examples 1 to 4 and Comparative Examples 1 described below were produced, and peeling workability of the adhesive tape was evaluated by the following method. Table 3 shows the results.

[Example 1]

A tape was used in the same manner as in Reference Example 2, except that a non-adhesive portion 1 and an adhesive portion 2 shown in FIG. 1 were formed in an oblique stripe and alternately provided with a pressure-sensitive adhesive layer on one side of the substrate with a calendar roll. An adhesive tape having a width of 25 mm was produced. The stripe width of the non-adhesive portion 1 and the adhesive portion 2 was 5 mm, respectively.

[Example 2]

A pressure-sensitive adhesive tape having a tape width of 25 mm was produced in the same manner as in Reference Example 2, except that a non-adhesive portion 1 shown in FIG. 2 was formed on the one side of the base material in parallel with the width direction of the tape with a calendar roll. . The length of the non-adhesive portion 1 was 5 mm, and the length of the adhesive portion 2 was 10 mm.

[Example 3]

An adhesive tape having a tape width of 25 mm was produced in the same manner as in Reference Example 2, except that an adhesive layer having non-adhesive portions 1 provided on both side ends shown in FIG. 3 was formed on one side of the substrate with a calendar roll. The width of the non-adhesive portion 1 was 5 mm, respectively.

[Example 4]

An adhesive tape having a tape width of 25 mm was produced in the same manner as in Reference Example 2, except that an adhesive layer having a non-adhesive portion 1 provided in the center shown in FIG. 4 was formed on one side of the substrate with a calendar roll. The width of the non-adhesive portion 1 was 5 mm.

[Comparative Example 1]

In the same manner as in Reference Example 2, a pressure-sensitive adhesive tape having a width of 25 mm was applied to the pressure-sensitive adhesive.

The adhesive tape was affixed to a metal surface having no irregularities to a length of 100 mm, and was evaluated based on the following criteria based on the texture when peeled off while wearing a paddock.

[◎]: It was easy to peel.

[○]: It was easy to peel off.

[×]: It was difficult to peel.

<Evaluation result of peeling workability>

As is evident from the results shown in Table 3, the adhesive tapes of Examples 1 to 4 had good peelability because the non-adhesive portion 1 became a gripping zone. Specifically, the adhesive tape of Example 1 (FIG. 1) was easy to peel off from the grip even when cut in any place. The adhesive tape of Example 2 (FIG. 2) was easy to peel off from the grip when the non-adhesive surface was cut to be positioned at the distal end. The adhesive tape of Example 3 (FIG. 3) was easy to peel off from the grip even when cut in any place. The adhesive tape of Example 4 (FIG. 4) was slightly harder to peel than the adhesive tapes of Examples 1 to 3 because the gripper was located at the center, but was significantly easier to peel than the adhesive tape of Comparative Example 1. On the other hand, the adhesive tape of Comparative Example 1 was difficult to peel off because there was no gripper.

In addition, since the adhesive tapes of Examples 1 to 4 have a non-adhesive portion (1), the adhesive strength and the tex are slightly lower than those of Reference Example 3, but the adhesive strength is much better than Comparative Example 1 using a solvent-based adhesive composition. It was to have a tech.

<Evaluation test of changes in appearance and aging of roll products>

The appearance and aging change of the roll product of the adhesive tapes of Examples 1-4 were evaluated by the following method. Specifically, as shown in the upper part of FIG. 6, the adhesive tape is wound around a paper tube to form a roll product 6 (width 25 mm, winding length 25 m or 300 m), and the outer circumferential surface or tape end of the roll product 6 The cut surface of was observed visually, and evaluated according to the following criteria. Further, the paper tube of the roll product 6 was suspended on a shaft and left at 40°C for 1 week, and the presence or absence of unwinding (bowl shape deformation) as shown in the lower side of FIG. 6 was visually confirmed and evaluated according to the following criteria. . Table 4 shows the results.

[◎]: There was no problem with the outer circumferential surface and the cut surface, and no unwinding occurred.

[○]: There were some problems with the outer circumferential surface and the cut surface, but no unwinding occurred.

[△]: There were some problems with the outer circumferential surface and the cut surface, and also unwinding occurred.

[×]: There was a big problem in the outer circumferential surface and the cut surface, and also unwinding occurred.

<Results of evaluating unwinding of roll products>

As apparent from the results shown in Table 4, the adhesive tape of Example 1 (FIG. 1) and the adhesive tape of Example 2 (FIG. 2) had no problems on the outer circumferential surface and cut surface of the roll product 6, and also unwinding. Did not occur. On the other hand, the adhesive tape of Example 3 (FIG. 3) and the adhesive tape of Example 4 (FIG. 4) had a slight problem with the outer circumferential surface and the cut surface of the rolled product 6 wound with 25 m, and the rolled product 6 wound with 300 m. In addition, unwinding also occurred.

Specifically, the adhesive tape of Example 3 (FIG. 3) and the adhesive tape of Example 4 (FIG. 4) have a pattern in which the non-adhesive portion 1 and the adhesive portion 2 are continuous at both ends or central portions in the winding direction. Therefore, when this was rolled up to form a roll product 6, the difference in tape thickness between both portions 1 and 2 increased, and unevenness was generated on the outer circumferential surface of the roll product 6. On the other hand, since the adhesive tape of Example 1 (FIG. 1) and the adhesive tape of Example 2 (FIG. 2) do not have a pattern consisting of the non-adhesive portion 1 and the adhesive portion 2, they are not continuous with respect to the winding direction. When the roll product 6 was wound up, the difference in tape thickness between the portions 1 and 2 was offset, and the outer circumferential surface of the roll product 6 was smooth.

Since the adhesive tape of Example 3 (FIG. 3) and the adhesive tape of Example 4 (FIG. 4) have non-adhesive portions 1 and 2, the adhesive portion 2 has a continuous pattern at both ends or the central portion in the winding direction. When the roll product 6 was rolled up by 300 m, the difference in adhesive force due to the difference in the tape thicknesses of the portions 1 and 2 was greatly increased, and when it was suspended at 40°C for 1 week, unwinding occurred. On the other hand, since the adhesive tape of Example 1 (FIG. 1) and the adhesive tape of Example 2 (FIG. 2) do not have a pattern consisting of the non-adhesive portion 1 and the adhesive portion 2, they are not continuous with respect to the winding direction. Even if the roll product 6 was rolled up by 300 m, the difference in the adhesive strength of both parts 1 and 2 was canceled out, and even when suspended at 40°C for one week, no unwinding occurred.

[Industrial availability]

Although the adhesive tape of the present invention can be used without limitation for various uses, it is very useful for applications such as peeling after use, for example, masking tape for rough coating such as roads and walls. It is also useful as a temporary fixing for various processes and a temporary fixing tape. In addition, it can be suitably used even when there is a location where the adhesive does not want to contact the adherend.

1 Non-adhesive part
2 adhesive part
3 adhesive tape
3a description
3b adhesive layer
4 Chuck
5 SUS version
6 Roll product of adhesive tape

Claims (6)

An adhesive tape having an adhesive layer in which a non-adhesive portion is partially present on at least one side of a substrate, the adhesive layer comprising a solid adhesive composition, and the thickness of the adhesive layer is 0.03 to 0.6 mm Phosphorus adhesive tape. The method according to claim 1,
An adhesive tape in which the solid adhesive composition contains a rubber-based adhesive. The method according to claim 1,
An adhesive tape in which the solid adhesive composition includes an inorganic filler. The method according to claim 1,
In the case where the pattern consisting of the non-adhesive portion and the pressure-sensitive adhesive portion in the pressure-sensitive adhesive layer is a rolled product obtained by winding the pressure-sensitive adhesive tape, the whole or part of the difference in the tape thickness difference between the non-adhesive portion and the pressure-sensitive adhesive portion is a pattern of offset tape . The method according to claim 4,
An adhesive tape in which the adhesive portion and the non-adhesive portion are alternately formed in an oblique stripe shape. The method according to claim 1,
An adhesive tape whose base material is woven or knitted fabric.

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