JP7011820B2 - Adhesive tape and manufacturing method of adhesive tape - Google Patents

Description

The present invention relates to an adhesive tape (including double-sided adhesive tape) and a method for manufacturing the adhesive tape, and more specifically, an adhesive tape used for masking and curing in building interior / exterior, building painting, vehicle painting, etc., packaging, etc. For adhesive tapes that are required to have hand-cutting properties, such as the adhesive tapes used in The present invention relates to an adhesive tape capable of preventing subsequent misalignment and peeling, and deformation of a telescope-like (bamboo child-like) when wound into a roll, and a method for manufacturing the same.

As the adhesive tape used for masking and curing in the above-mentioned interior / exterior of buildings, architectural painting, vehicle painting, etc., a single-sided tape in which an adhesive is applied to one side of a film to be a base material layer is generally used.

As shown in FIG. 8, such an adhesive tape 100 is provided in a state of being rolled into a winding core 140 or the like so that the adhesive layer 130 is on the inside and the base material layer 120 is on the outside. At the time of use, the user pulls out the required length of the adhesive tape 100 from the roll, attaches it to the adherend, and then cuts and attaches the adhesive tape 100 at a desired portion.

When cutting such an adhesive tape 100, it is possible to cut by using a dedicated cutter having a sawtooth-shaped blade or by using a blade such as scissors or a cutter knife, but such a blade or the like is used every time the tape is cut. In order to avoid the complexity of using the adhesive tape, there is a demand for an adhesive tape having "hand-cutting property" that can be easily cut by hand.

Adhesive tapes having such hand-cutting properties include Japanese paper, textile fabrics (hereinafter referred to as "split cloth"), and adhesive tapes using a synthetic resin film with embossed cuts as a base material. ..

In particular, when the adhesive tape is cut by hand, it is required that the adhesive tape can be cut linearly in a direction orthogonal to the longitudinal direction of the adhesive tape. The so-called "cloth tape" made of cloth is the mainstream, and a polyolefin-based resin film having a concave groove formed in a direction orthogonal to the longitudinal direction of the adhesive tape to impart hand-cutting property is used as a base material layer. Things are offered.

In the above-mentioned cloth tape, a PE film having a thickness of about 10 to 40 μm is laminated on both sides or one side of a split cloth formed by weaving fibers such as suhu (rayon) or polyester with different thicknesses of warps and wefts. Is used as a substrate layer.

In the cloth tape using the base material layer provided with the split cloth produced by weaving the warp and weft in this way, even if it is cut by hand, it is cut linearly in the length direction of the warp or weft of the split cloth. can do.

However, with such a cloth tape, in order to obtain a base material layer from the above-mentioned structure, a step of laminating a pre-woven split cloth with a PE film is required, resulting in a multi-step manufacturing process. ， Cloth tape is expensive.

Therefore, an adhesive tape has been proposed in which a single-layer synthetic resin film is used as a base material and can be cut linearly in the width direction even when cut by hand.

As shown in FIG. 9, as such an adhesive tape 100, one surface is formed as a smooth surface 121, and a large number of concave grooves 123 are formed on the other surface in a direction orthogonal to the longitudinal direction of the adhesive tape at predetermined intervals. A pressure-sensitive adhesive tape has been proposed in which a polyolefin resin film having an uneven surface 122 is used as a base material layer 120, and an adhesive is applied to the uneven surface 122 of the base material layer 120 to form an adhesive layer 130 (Patent). Document 1).

Further, as described above, in the adhesive tape 100 having the polyolefin resin film provided with the uneven surface 122 as the base material layer 120, the structure for reducing the elongation of the adhesive tape 100 in the longitudinal direction while maintaining the hand-cutting property. The adhesive tape 100 provided with the above is also proposed.

As such an adhesive tape 100, as shown in FIG. 10, the adhesive layer 130 formed on the uneven surface 122 of the polyolefin resin film base material layer 120 is formed by the non-woven fabric or the split cloth 135 and the adhesive 131. There is a proposal for this (Patent Document 2).

Further, as shown in FIG. 11, after applying a polyester resin 136 having a number average molecular weight of 10,000 or more and a glass transition temperature of 0 to 80 ° C. on the uneven surface 122 of the base layer 120 made of a polyolefin resin film. A pressure-sensitive adhesive tape having an pressure-sensitive adhesive layer 130 formed by applying an acrylic pressure-sensitive adhesive has also been proposed (Patent Document 3).

Japanese Unexamined Patent Publication No. 3-47885 Japanese Unexamined Patent Publication No. 9-137133 Actual Opening 2001-172586 Gazette

In the adhesive tape 100 (FIG. 9) introduced as Patent Document 1 described above, a concave groove 123 is formed on the uneven surface 122 of the polyolefin resin film used as the base material layer 120 in a direction orthogonal to the longitudinal direction of the adhesive tape 100. Therefore, even when the adhesive tape 100 is cut by hand, the base material layer 120 can be cut neatly in a straight line by tearing along the concave groove 123.

However, the polyolefin resin film adopted by the adhesive tape 100 described in Patent Document 1 as the base material layer 120 is not only non-stretched and itself is rich in elasticity as compared with paper or split cloth. Since the concave groove 123 is formed in the direction orthogonal to the longitudinal direction of the adhesive tape 100, the base material layer 120 is more easily stretched in the formed portion of the concave groove 123 which is thin.

As a result, in such an adhesive tape 100, the adhesive tape 100 is used when the tape of a required length is pulled out from the rolled state as shown in FIG. 8 or when the tape is cut by hand. The base material layer 120 of the above is stretched in the longitudinal direction, and is attached to the adherend in such a stretched state.

Then, the adhesive tape 100 attached with the base material layer stretched shrinks in an attempt to return to the original shape of the base material layer 120, so that the attachment position on the adherend shifts with time, or There are problems such as the end of the adhesive tape 100 being lifted and peeled off, and if such an adhesive tape is used for masking during painting, the coating position will shift.

Further, the polyolefin resin film used as the base material layer 120 in the pressure-sensitive adhesive tape 100 described in Patent Document 1 is easily stretched in the longitudinal direction as described above, and is heated to 90 to 110 ° C. when the pressure-sensitive adhesive is applied to the base material layer. Since it is heated and dried, it is wound around the winding core 140 in a state of being stretched by about 0.3 to 1% due to the tension when it is subsequently wound into a roll shape.

As a result, the adhesive tape 100 shrinks in the longitudinal direction after being wound into a roll shape, so that the roll of the adhesive tape 100 tends to be deformed into a telescope shape (bamboo shoot shape) as shown in FIG. There is.

On the other hand, if the adhesive tape 100 is wound with low tension in order to prevent such deformation of the telescope shape (bamboo shoot shape), cavities (cavities) are likely to occur due to the entrainment of air, and both of them have a poor appearance. It cannot be shipped as a product, and the defect rate generated in this way reaches a maximum of about 1 to 7%, resulting in poor yield.

Furthermore, with adhesive tape used for masking or curing, it is necessary to peel off and remove it from the adherend after the work such as painting is completed, but in order to impart hand-cutting property, it is necessary to remove it in the longitudinal direction. The above-mentioned adhesive tape 100 having the above-mentioned polyolefin resin film having the concave groove 123 formed in the direction orthogonal to the above-mentioned base layer 120 is easy to stretch and cut even during the work of peeling from the adherend. The peeling work becomes complicated.

As described above, the adhesive tape 100 described in Patent Document 1 in which the polyolefin resin film having the concave groove 123 formed on one side as the base material layer 120 is easily stretched in the longitudinal direction, and as a result, the above-mentioned various problems occur. Therefore, it is required to suppress the elongation of the adhesive tape 100 in the longitudinal direction.

As a method of suppressing such elongation, it is conceivable to make the depth of the concave groove 123 shallow or to make the entire polyolefin resin film as the base material layer 120 thick, but in this configuration, the adhesive tape 100 Although it is possible to suppress elongation in the longitudinal direction, the hand-cutting property of the adhesive tape 100 is reduced, and particularly in a configuration in which the thickness of the entire polyolefin resin film is increased, the followability to the surface of the adherend is reduced. Peeling or the like is likely to occur.

On the other hand, in the adhesive tape (FIG. 10) described in Patent Document 2 described above, the adhesive tape 100 is made by embedding a non-woven fabric or a split cloth 135 in the adhesive layer 130 to strengthen the adhesive layer 130. It suppresses the occurrence of elongation in the longitudinal direction.

However, in this configuration, it is necessary to integrate the non-woven fabric or split cloth 135 and the adhesive 131 to form the pressure-sensitive adhesive layer 130, and as shown in FIG. 13, the non-woven fabric or split cloth 135 and the pressure-sensitive adhesive 131 are stepped. Since it is necessary to form the adhesive layer 130 by laminating it on the paper 150 and then laminating it on the polyolefin resin film to be the base material layer 120, it is manufactured in the same manner as in the case of the cloth tape described above. As a result of the increase in the number of steps and the increase in manufacturing cost, the adhesive tape 100 becomes expensive.

Moreover, in the structure in which the non-woven fabric or the split cloth 135 is embedded in the pressure-sensitive adhesive layer 130, the elongation can be suppressed, but the hand-cutting property is significantly reduced.

Moreover, since the deformability of the adhesive layer 130 is significantly reduced by burying the non-woven fabric or the split cloth 135, the followability to the surface of the adhered portion is lowered, peeling or floating is likely to occur, and the function as a masking tape is obtained. It can also be compromised.

Further, as shown in FIG. 11, in the configuration described in Patent Document 3 described above, the polyester resin 136 is applied to the uneven surface 122 provided on the base layer 120 made of the polyolefin resin film before the adhesive is applied. ， Elongation may be suppressed, but it is considered that the hand-cutting property is significantly reduced or almost lost.

Further, when the polyester resin 136 is applied as the base layer and then the solvent type pressure-sensitive adhesive is applied to form the pressure-sensitive adhesive layer 130, the base polyester-based resin 136 invades the solvent in the pressure-sensitive adhesive 131. Therefore, the polyester resin 136 is softened by the so-called "solvent attack" that causes an abnormality, and the effect of suppressing elongation cannot be obtained. Therefore, it is considered that the manufacturing method or the material is also restricted.

Further, the adhesive tapes described in Patent Documents 1 to 3 use a polyoliphen-based plastic as a base material and have insufficient air permeability. Therefore, when the adhesive tape is attached, it is between the surface of the adherend and the adhesive tape 100. It is easy to embrace air and lacks the beauty of appearance, and the expansion of the embraced air, the outgas from the adherend, the thermal expansion of the base material, etc. are combined, and it is easy to cause the adhesive tape 100 to swell or peel off. There was a problem.

Therefore, the present invention has been made to eliminate the above-mentioned drawbacks in the prior art, and as described above, a polyolefin resin film having one surface formed as a smooth surface and the other surface as an uneven surface is used as a base material layer. In the adhesive tape in which the adhesive layer is formed on the uneven surface of the base material layer, the elongation in the longitudinal direction is suppressed while maintaining the hand-cutting property in the width direction of the adhesive tape, specifically, the elongation is 70% or less. The tensile strength was improved, preferably 100 (N / 50 mm width) or more, preferably 130 (N / 50 mm width) or more, while suppressing it to 50% or less, more preferably 30% or less. By providing the adhesive tape, it is possible to prevent the adhesive tape from being displaced or peeled off after being attached, and to prevent the adhesive tape wound in a roll shape from being deformed into a telescope shape (bamboo child shape) as shown in FIG. Moreover, it is an object of the present invention to provide a method for manufacturing an adhesive tape (including a double-sided adhesive tape) and an adhesive tape, which have good workability when peeled from an adherend after completion of painting work and the like, and have breathability. And.

The means for solving the problem are described below together with the reference numerals used in the embodiment for carrying out the invention. This reference numeral is described for clarifying the correspondence between the description of the scope of claims and the description of the form for carrying out the invention, and it goes without saying that the reference numerals are limited to the interpretation of the technical scope of the present invention. Not used.

In order to achieve the above object, the adhesive tape 10 of the present invention is used.
A base material layer 20 made of an unstretched polyolefin resin film having uneven surfaces 22 having a plurality of concave grooves 23 formed at predetermined intervals on one side in a direction orthogonal to the longitudinal direction of the adhesive tape, and the base material layer 20. The resin having the pressure-sensitive adhesive layer 30 formed on the uneven surface 22 of the above, and the fiber pieces 32 being dispersed in the base material layer 20 and the pressure-sensitive adhesive layer 30, constituting the base material layer 20 and the pressure-sensitive adhesive layer 30. It is characterized by having air permeability due to a gap formed between the fiber piece 32 and the fiber piece 32 or a hole possessed by the fiber piece 32 (see claim 1 and FIG. 1).

Further, in the adhesive tape 10 of the present invention, the pressure-sensitive adhesive layers 30 and 30'are formed on both surfaces of the base material layer 20, and the fiber pieces 32 are dispersed in the base material layer 20 and the pressure-sensitive adhesive layers 30 and 30'. The double-sided adhesive tape 10'has breathability due to the gap formed between the resin constituting the base material layer 20 and the pressure-sensitive adhesive layers 30 and 30'and the fiber piece 32 or the holes of the fiber piece 32 . (See claim 2 and FIG. 2).

Further, in the double-sided adhesive tape 10', the base material layer 20 may have the uneven surfaces 22 and 22'on both sides. (See claims 3 and 3).

In the present invention, the "fiber piece" includes a single filament of a short fiber, a monofilament composed of a fragment of a short fiber or a fragment of a long fiber, and a fragment of a multifilament (thread) obtained by twisting a monofilament.

The pressure-sensitive adhesive layer 30 (in the case of double-sided adhesive tape 10', the pressure-sensitive adhesive layers 30, 30') preferably contains 0.5 to 10 parts by weight of the fiber piece 32 with respect to 100 parts by weight of the solid content of the pressure-sensitive adhesive 31. Is characterized by containing 1 to 5 parts by weight (claim 4, FIG. 1).

The fiber piece 32 has a fiber diameter of 0.05 to 100 denier (0.01 to 200 μm diameter), preferably 1 to 10 denier (15 to 60 μm), and more preferably 0.5 to 4 denier (3 to 40 μm). Can be used (claim 5).

The "denier" is the mass of a 9000 m thread expressed in grams, and the value of 1/9 of the above "denier" is the "tex" (mass of a 1000 m thread) used in JIS and ISO. Is expressed in grams).

Further, a fiber piece 32 having a length of 1 to 10 mm, preferably 1 to 7 mm, and more preferably 2 to 5 mm can be used (claim 6).

It should be noted that various fiber diameters and fiber lengths can be mixed and used.

Further, the base material layer is characterized by containing 0.2 to 10 parts by weight, preferably 0.5 to 3 parts by weight, of the fiber pieces with respect to 100 parts by weight of the solid content of the base material layer (claimed). Item 7, Fig. 1).

In the adhesive tape 10 and the double-sided adhesive tape 10'of the present invention, the elongation of the adhesive tape in the longitudinal direction is 30% or less, preferably 20% or less, and more preferably 16% or less (claim 8).

Further, it is preferable that the tensile strength of the adhesive tape in the longitudinal direction is 100 (N / 50 mm width) or more (claim 9).

The pressure-sensitive adhesive layer 30 (in the case of the double-sided pressure-sensitive adhesive tape 10', the pressure-sensitive adhesive layers 30, 30') of the pressure-sensitive adhesive tape 10 of the present invention may have fiber pieces 32 uniformly dispersed over the entire thickness direction. (See FIG. 1), preferably, the dispersion amount of the fiber pieces 32 is reduced on the side to be adhered to the adherend (lower side of the paper surface) (see claims 10, FIGS. 4 and 5, both sides). The adhesive tape 10'is not shown).

Further, in the pressure-sensitive adhesive layer 30 (in the case of the double-sided pressure-sensitive adhesive tape 10', the pressure-sensitive adhesive layers 30 and 30'), the amount of the fiber pieces 32 dispersed on the side to be attached to the base material layer 20 (upper side of the drawing) is reduced. It is preferable to have a configuration (see claim 11, FIG. 5, the double-sided adhesive tape 10'is not shown).

The fiber pieces 32 to be dispersed in the base material layer 20 and the pressure-sensitive adhesive layer 30 (in the case of the double-sided pressure-sensitive adhesive tape 10', the pressure-sensitive adhesive layers 30 and 30') include acrylic, PET, olefin-based resin, rayon, and vinylon. , A material made of any material selected from the group of nylon can be used, and one of the fiber pieces 32 or a mixture of two or more of the fiber pieces 32 may be dispersed in the pressure-sensitive adhesive layer 30 (. Claim 12).

It is preferable that the fiber piece 32 is a hollow fiber piece (claim 13).

The fiber pieces 32 may be dispersed in layers along the longitudinal direction of the adhesive tape (see claim 14 and FIG. 6).

Further, the method for manufacturing the adhesive tape 10 of the present invention is as follows.
On the uneven surface 22 of the base material layer 20 made of an unstretched polyolefin resin film having an uneven surface 22 in which a plurality of concave grooves 23 are formed at predetermined intervals in a direction orthogonal to the longitudinal direction of the adhesive tape on one side. A resin constituting the base material layer 20 and the pressure-sensitive adhesive layer 30 by laminating the pressure-sensitive adhesive to form the pressure-sensitive adhesive layer 30 and dispersing the fiber pieces 32 in the base material layer 20 and the pressure-sensitive adhesive layer 30. It is characterized in that the air permeability is provided by the gap formed between the fiber piece 32 and the fiber piece 32 or the hole provided in the fiber piece 32 (claim 15).

Further, an adhesive is laminated on both surfaces of the base material layer 20 to form the pressure-sensitive adhesive layers 30 and 30', and the fiber pieces 32 are dispersed in the base material layer 20 and the pressure-sensitive adhesive layers 30 and 30'. It may be allowed to have air permeability by a gap formed between the resin constituting the base material layer 20 and the pressure-sensitive adhesive layers 30 and 30'and the fiber piece 32 or a hole provided in the fiber piece 32 (. 16).

Further, the base material layer 20 may be made of an unstretched polyolefin resin film having uneven surfaces 22 having a plurality of concave grooves 23 formed at predetermined intervals on both sides in a direction orthogonal to the longitudinal direction of the adhesive tape. (Claim 17).

The pressure-sensitive adhesive layer 30 (in the case of the double-sided pressure-sensitive adhesive tape 10', the pressure-sensitive adhesive layers 30, 30') is formed by laminating a plurality of types of pressure-sensitive adhesives having different dispersion amounts of the fiber pieces 32 in multiple layers. The pressure-sensitive adhesive layer 30 in which the dispersion amount of the fiber pieces 32 is reduced may be formed on the adhesive surface side with the adherend (see claim 18, FIGS. 4 and 5, and the double-sided adhesive tape 10'is shown in FIG. I can't show it.)

Similarly, a plurality of types of adhesives having different dispersion amounts of the fiber pieces 32 are laminated in multiple layers, and the dispersion amount of the fiber pieces 32 is increased on the adhesive surface side of the base material layer 20 with the uneven surface 22. The adhesive layer 30 (in the case of the double-sided adhesive tape 10', the adhesive layers 30, 30') may be formed to be reduced (see claim 19, FIG. 5, the double-sided adhesive tape 10'is not shown. .).

With the configuration of the present invention described above, the adhesive tape 10 (including the double-sided adhesive tape 10') of the present invention could obtain the following remarkable effects.

The adhesive tape 10 (and double-sided adhesive tape 10') of the present invention having the above-mentioned configuration was able to reduce the elongation in the longitudinal direction while maintaining the hand-cutting property in the width direction, and further to have breathability. ..

The suppression of elongation due to the dispersion of the fiber pieces behaves as if the base material layer and the pressure-sensitive adhesive layer were hypercrosslinked due to the dispersion of the fibers. By "pseudo-crosslinking state"), the elongation is physically suppressed, and compared to chemical cross-linking, the functional groups that contribute to the adhesive force are not blocked, and the development of the adhesive force is reduced. It is advantageous in that it never happens.

As described above, the adhesive tape 10 (and the double-sided adhesive tape 10') of the present invention can be stretched in a stretched state because it is difficult to stretch when pulled out from the rolled state because the adhesive tape 10 (and the double-sided adhesive tape 10') can be stretched in the longitudinal direction. It is possible to prevent the sticking position from shifting due to the shrinkage of the adhered adhesive tape and the peeling due to the floating of the end, and when the adhesive tape is wound with tension to prevent the formation of winding cavities. Since it is difficult for the adhesive tape to stretch, it is possible to suitably prevent the telescope-like (bamboo child-like) deformation caused by the shrinkage of the adhesive tape 10 (and the double-sided adhesive tape 10') after being wound into a roll shape. As a result, it was possible to suppress the occurrence of defective products and improve the yield.

Further, since the tensile strength of the adhesive tape 10 (and the double-sided adhesive tape 10') in the longitudinal direction could be improved, the adhesive tape 10 used as a masking tape after the work such as painting was completed, for example. (And, when the double-sided adhesive tape 10') is peeled off / removed from the adherend, the adhesive tape can be easily peeled off / removed without breaking.

Further, since the adhesive tape 10 (and the double-sided adhesive tape 10') of the present invention has breathability, it is possible to prevent the air generated at the time of sticking from being embraced, and the appearance after sticking is beautiful. Not only that, it was possible to provide the adhesive tape 10 (and the double-sided adhesive tape 10') that does not cause the problem of peeling due to the outgas of the adherend or the expansion of the embraced air.

Regarding the breathability of the adhesive tape 10 (and the double-sided adhesive tape 10') of the present invention, for example, a slight gap formed between the resin constituting the base material layer and the adhesive layer and the dispersed fiber piece 32 or , It is inferred that air escapes along the holes of the fiber pieces.

Further, in particular, the amount of the fiber piece 32 added is 0.5 to 10 parts by weight, preferably 1 to 5 parts by weight, or 100 parts by weight of the base material layer solid content with respect to 100 parts by weight of the solid content of the pressure-sensitive adhesive 31. On the other hand, the amount of the fiber piece is relatively small, that is, only 0.2 to 10 parts by weight of the fiber piece is contained, and the fiber piece 32 to be dispersed has a relatively small diameter of 0.05 to 100 denier. This makes it possible to suppress the elongation of the adhesive tape 10 (and the double-sided adhesive tape 10') and improve the tensile strength without sacrificing the hand-cutting property of the adhesive tape 10 (and the double-sided adhesive tape 10'). did it.

By using a relatively short fiber piece 32 to be added to the pressure-sensitive adhesive 31, which is 1 to 10 mm, preferably 1 to 7 mm, and more preferably 2 to 5 mm, the fiber piece 32 can be easily dispersed in the pressure-sensitive adhesive. On the other hand, even with the dispersion of fiber pieces of this length, it was possible to obtain the necessary suppression of elongation and improvement of tensile strength.

In the configuration in which a plurality of concave grooves (not shown) are formed on the uneven surface 22 of the base material layer 20 in a direction parallel to the longitudinal direction of the adhesive tape 10 at predetermined intervals, the hands in the width direction of the adhesive tape 10 are formed. Not only the cutting property but also the hand cutting property in the longitudinal direction could be imparted.

In the example in which the dispersion amount of the fiber pieces 32 in the adhesive layer 30 (in the case of the double-sided adhesive tape 10', the adhesive layers 30, 30') is reduced on the adhesive surface side with the adherend, the configuration is such that the dispersion amount is reduced. Good adhesion to the adherend could be maintained even by the dispersion of the fiber pieces 32.

Further, the amount of the fiber pieces 32 dispersed in the pressure-sensitive adhesive layer 30 (in the case of the double-sided pressure-sensitive adhesive tape 10', the pressure-sensitive adhesive layers 30 and 30') is also reduced on the adhesive surface side of the base material layer 20 with the uneven surface 22. In the example of the above configuration, strong adhesion can be obtained between the uneven surface 22 of the base material layer 20 and the pressure-sensitive adhesive layer 30, and when the pressure-sensitive adhesive tape 10 is peeled off from the adherend, delamination occurs and the pressure-sensitive adhesive layer is formed. It was also possible to suitably prevent the generation of so-called "glue residue" in which a part of 30 remains attached to the surface of the adherend.

Furthermore, since there are many processes as a conventional base material layer, an adhesive tape that can replace the existing woven fabric type tape can be obtained without weaving expensive fibers vertically and horizontally (warp and weft), which brings about a high economic effect.

In the polypropylene and polyethylene mixed resin, which has been tried in the past as a base material layer to solve the above problems, the deflection generated in the extruded film, the wrinkles in the winding, and the wrinkles in the line (Abara,) due to the difference in melting point. Although flare) occurred frequently, the fiber pieces of the present application, which replace polypropylene, were able to achieve the above effects and minimize the occurrence of such wrinkles.

FIG. 6 is a schematic cross-sectional view of the adhesive tape 10 according to the first embodiment of the present invention. FIG. 6 is a schematic cross-sectional view of the double-sided adhesive tape 10'of the second embodiment of the present invention. FIG. 6 is a schematic cross-sectional view of the double-sided adhesive tape 10'of the third embodiment of the present invention. FIG. 6 is a schematic cross-sectional view of the adhesive tape 10 according to still another embodiment of the present invention. FIG. 6 is a schematic cross-sectional view of the adhesive tape 10 according to still another embodiment of the present invention. FIG. 6 is a schematic cross-sectional view of the adhesive tape 10 according to still another embodiment of the present invention. The explanatory view of the manufacturing method of the polyolefin resin film which becomes a base material layer. A perspective view of the adhesive tape wound into a roll. Explanatory drawing of conventional adhesive tape (corresponding to patent document 1). Explanatory drawing of conventional adhesive tape (corresponding to patent document 2). Explanatory drawing of conventional adhesive tape (corresponding to patent document 3). Explanatory drawing of the adhesive tape deformed into a telescope shape (bamboo shoot shape). Explanatory drawing of the conventional method of manufacturing an adhesive tape (corresponding to FIG. 3 of Patent Document 2).

Next, an embodiment of the present invention will be described with reference to the accompanying drawings.

[Overall structure]
In the first embodiment of the present invention, for example, as shown in FIG. 1, one surface is a smooth surface 21, and a large number of concave grooves 23 in a direction orthogonal to the longitudinal direction of the adhesive tape are formed on the other surface. The polyolefin resin film having the uneven surface 22 can be used as the base material layer 20, and the adhesive tape 10 having the adhesive layer 30 provided on the uneven surface 22 of the base material layer 20 can be used.

The adhesive tape 10 of the present invention is formed by dispersing the fiber pieces 32 in the above-mentioned base material layer 20 and the adhesive layer 30 to suppress the elongation of the adhesive tape 10 in the longitudinal direction while maintaining the hand-cutting property. As an example, it is an adhesive tape having a total thickness of 120 to 600 μm, which has improved tensile strength and further has breathability. The total thickness is not limited to this, and can be set to an appropriate thickness depending on the application and the like.

Further, as a second embodiment of the present invention, for example, as shown in FIG. 2, one surface is a smooth surface 21, and a large number of concave grooves 23 in a direction orthogonal to the longitudinal direction of the adhesive tape are formed on the other surface. The polyolefin resin film having the uneven surface 22 as the surface is used as the base material layer 20, and the pressure-sensitive adhesive layers 30 and 30'are provided on both surfaces of the base material layer 20, and the base material layer 20 and the pressure-sensitive adhesive layers 30 and 30' are provided. The double-sided adhesive tape 10'with breathability and hand-cutting property, in which the fiber pieces 32 are dispersed in the adhesive of the above, can be obtained.

Further, as a third embodiment of the present invention, as shown in FIG. 3, both sides are concave-convex surfaces 22, 22'in which a large number of concave grooves 23, 23'in the direction orthogonal to the longitudinal direction of the adhesive tape are formed. A polyolefin resin film is used as a base material layer 20, and pressure-sensitive adhesive layers 30 and 30'are provided on both sides of the base material layer 20. Fiber pieces are contained in the pressure-sensitive adhesive of the base material layer 20 and the pressure-sensitive adhesive layer 30 and 30'. It can also be a double-sided adhesive tape 10'with 32 dispersed, breathable and hand-cutting property.

[Base layer]
The film used as the base material layer 20 in the adhesive tape 10 and the double-sided adhesive tape 10'of the present invention is an unstretched polyolefin resin film, which can be produced by using a known polyolefin resin.

Examples of such polyolefin resins include polyethylene resins, polypropylene resins, copolymer resins of ethylene and propylene, and copolymer resins of ethylene and / or propylene with one or more other α-olefins. It can be exemplified.

Examples of the α-olefin include butene-1, pentene-1, hexene-1, heptene-1, octene-1, nonene-1, 4-methylpentene-1, and decene-1. ..

A polyethylene resin can be mentioned as an example of a preferable polyolefin resin.

The molecular weight of the polyolefin resin is not particularly limited as long as it can be formed into a film, but when expressed by the melt index, which is a measure of the flowability of the resin, it is generally in the range of 0.2 to 20 g / 10 minutes, preferably 1. It is in the range of ~ 10 g / 10 minutes (load 2.16 kg, temperature 190 ° C.).

The thickness of the above-mentioned polyolefin resin sheet serving as the base material layer 20 of the adhesive tape 10 and the double-sided adhesive tape 10'of the present invention is, for example, in the range of 40 to 400 μm, but is not limited to this thickness and is used. It can be set to an appropriate thickness according to the above.

In this polyolefin resin sheet, one surface is a smooth surface 21 and the other surface is an uneven surface 22, and a large number of concave grooves 23 forming orthogonal directions with respect to the longitudinal direction of the adhesive tape 10 are formed on the uneven surface 22. ing.

Further, in the case of the double-sided adhesive tape 10', both sides of the polyolefin resin sheet are made uneven surfaces 22 and 22', and the concave and convex grooves 23 forming orthogonal directions with respect to the longitudinal direction of the adhesive tape 10 are formed on the uneven surfaces 22 and 22'. It may be formed in large numbers.

The concave groove 23 is a position where the base material layer 20 is broken when the adhesive tape 10 is cut by hand, and if the groove 23 can be cut by hand, the cross-sectional shape thereof is In addition to the V-shape as shown in the figure, any shape such as a rectangular shape or a (semi-) circular shape may be used, and the depth thereof is not particularly limited, but the above-mentioned polyolefin having a sheet thickness of 40 to 400 μm is not particularly limited. When the resin sheet is used as the base material layer 20, if the depth is less than 30 μm, the hand-cutting property is impaired. Therefore, a concave groove 23 of 30 to 300 μm, preferably 40 to 120 μm is formed, and the concave groove 23 is formed. The wall thickness at the formed portion is preferably 10 to 100 μm.

If the distance between the concave grooves 23 is less than 0.5 mm, the strength is insufficient in the longitudinal direction of the adhesive tape 10, and if it exceeds 5 mm, the original hand-cutting property may be insufficient. Therefore, as an example, 0. It can be set at intervals of 5 to 5 mm, preferably 0.6 to 1.4 mm. However, it may be formed wider or narrower than this.

FIG. 7 shows an example of a method for producing a polyolefin resin sheet using the above-mentioned polyolefin resin as a raw material, with one surface as a smooth surface 21 and the other surface as an uneven surface 22.

In the example shown in FIG. 7, the polyolefin resin kneaded with the fiber piece 32 in advance is melted and extruded into a film from the extrusion die 51 of the extruder 50, and then the extruded film is not completely cooled to room temperature. By passing between the embossed roll 61 and the rubber roll 62, a smooth surface 21 is provided on the contact side with the rubber roll 62, and a concave portion having a shape corresponding to the ridge 61a provided on the surface of the embossed roll 61 on the contact side with the embossed roll 61. It forms a groove 23.

When forming the uneven surfaces 22 and 22'on both sides of the base material layer 20, for example, an embossed roll 61'is prepared instead of the rubber roll 62 and passed between the embossed roll 61 and the embossed roll 61'. As a result, recessed grooves 23, 23'can be formed on both sides.

As shown in FIG. 7, the uneven surface 22 formed on the polyolefin resin film has a discharge electrode 64 and a smooth surface in order to improve the compatibility with the pressure-sensitive adhesive and prevent delamination from occurring. The corona discharge treatment may be performed when passing between the treatment rolls 65.

By performing the corona discharge treatment in this way, the affinity between the uneven surface 22 and the adhesive 31 described later (the anchoring property of the adhesive on the uneven surface and the wettability of the uneven surface) can be improved, and the adhesive tape 10 can be improved. It is possible to prevent the occurrence of so-called "glue residue", in which delamination occurs when the adhesive is peeled off from the adherend and the adhesive remains on the surface of the adherend.

As described above, the corona discharge treatment on the uneven surface 22 is preferable in order to improve the compatibility with the pressure-sensitive adhesive layer 30, but the corona discharge treatment is not essential for the adhesive tape 10 of the present invention, and if necessary. It suffices to process it.

The number of dyne (wetting index) of the base material layer 20 is preferably larger on the uneven surface 22 than on the smooth surface 21, and the preferable number of dyne (wetting index) is 30 Dyn / cm or less on the smooth surface 21 as an example. If the uneven surface 22 is 35 Dyn / cm or more and the wettability index of the smooth surface 21 is larger than 30 Dyn / cm, the smooth surface 21 and the adhesive layer 30 become more than necessary when the adhesive tape 10 is wound into a roll. The occurrence of the so-called "blocking phenomenon", which causes strong adhesion, makes it difficult to deploy the adhesive tape 10.

On the other hand, if the wetting index of the uneven surface 22 is less than 35 Dyn / cm, the adhesive force of the adhesive 31 to the uneven surface 22 is insufficient, which causes the above-mentioned “glue residue” and the like.

In addition to the above-mentioned corona discharge treatment, there is also a method of applying a primer as a method for increasing the affinity of the pressure-sensitive adhesive layer 30 with respect to the uneven surface 22.

Improving the affinity by applying such a primer is also a well-known method, and various known primers such as rubber-based primers such as nitrile rubber and acrylic resin-based primers can be used. can.

As with the above-mentioned corona discharge treatment, the application of a primer is not essential in the present invention and can be appropriately performed as needed, and the primer can be used instead of the above-mentioned corona discharge treatment or in combination with the above-mentioned corona discharge treatment. You may apply it.

Further, the fiber piece 32 is added to the base material layer 20 of the present invention, and the primary dispersion of the fiber piece 32 is kneaded with the polyolefin resin in a masterbatch and supplied to the extruder hopper. The fiber piece 32 used must have a heat melting temperature of the polyolefin resin in the range of 200 ° C., and from this viewpoint, polyester-based (Tg220 ° C.), nylon (Tg220 ° C.), and acrylic-based (thermosetting). The most preferable is rayon, which is unrelated to heat melting, but from the viewpoint of waterproofness, polypropylene-based and polyester-based are preferable.

The base material layer 20 in which the fiber pieces 32 are dispersed is an unstretched polyolefin resin film, which can be produced by using a known polyolefin resin.

[Adhesive layer]
A pressure-sensitive adhesive in which fiber pieces 32 are dispersed on the uneven surface 22 of the base material layer 20 made of the polyolefin resin film configured as described above, or on both sides of the base material layer 20 in the case of double-sided adhesive tape. The layer 30 is formed.

Adhesives As the adhesives constituting the adhesive layer 30, various known adhesives can be used, and examples thereof include acrylic adhesives, vinyl ether adhesives, silicone adhesives, and rubber adhesives. be able to.

The form of the pressure-sensitive adhesive to be used is not particularly limited, and any type of pressure-sensitive adhesive, emulsion-type pressure-sensitive adhesive, hot-melt-type pressure-sensitive adhesive, or the like may be used.

Method for Laminating the Adhesive Layer In the formation of the adhesive layer 30 described above, for example, as in the first embodiment of the present invention shown in FIG. 1, a pressure-sensitive adhesive in which fibers are dispersed in advance is used as a base material layer described above. It is formed by applying it to the uneven surface 22 of 20 or by transferring it to the uneven surface 22 of the base material layer 20 after applying it on process paper.

As shown in FIG. 1, the pressure-sensitive adhesive layer 30 may be formed by a single-layer pressure-sensitive adhesive layer 30 formed by applying one layer of a pressure-sensitive adhesive in which fiber pieces 32 are dispersed, but is preferable. , As shown in FIGS. 4 and 5, two or more layers of a plurality of types of adhesives having different dispersion amounts of the fiber pieces 32 are applied, and the dispersion amount of the fiber pieces 32 in the thickness direction of the pressure-sensitive adhesive layer 30 has a gradient. It may be used as a material.

The fiber piece 32 described above has air permeability by dispersing it in the base material layer 20 and the pressure-sensitive adhesive layer 30, and further, the base material layer 20 and the pressure-sensitive adhesive layer 30 are reinforced to reduce the elongation. At the same time, it is possible to obtain an improvement in tensile strength, which may cause the above-mentioned pseudo-crosslinking in the pressure-sensitive adhesive layer 30 and cause a decrease in followability and adhesive force to the surface of the adherend.

Therefore, as shown in FIG. 4, of the pressure-sensitive adhesive layer 30, the pressure-sensitive adhesive layer formed by laminating a pressure-sensitive adhesive having a relatively high content of fiber pieces 32 on the base material layer 20 side (upper side of the paper surface) (not shown). In the example, the pressure-sensitive adhesive layer 301) is used, while the side to be adhered to the adherend (lower side of the paper surface) is a pressure-sensitive adhesive layer formed by laminating a pressure-sensitive adhesive having a small amount of the fiber pieces 32 added (in the example shown in the figure). The pressure-sensitive adhesive layer containing a small amount of fiber pieces 302) may be used to form a pressure-sensitive adhesive layer having a multi-layer structure.

Further, as shown in FIG. 5, in order to prevent delamination between the base material layer and the pressure-sensitive adhesive layer, a pressure-sensitive adhesive having a relatively large dispersion amount of the fiber pieces 32 is laminated on the central portion of the pressure-sensitive adhesive layer 30 in the thickness direction. While the pressure-sensitive adhesive layer (fiber piece-containing pressure-sensitive adhesive layer 301 in the illustrated example) is provided, a pressure-sensitive adhesive formed by applying and laminating a pressure-sensitive adhesive having a small dispersion amount of fiber pieces on the outside of the pressure-sensitive adhesive layer is provided. A three-layered pressure-sensitive adhesive layer 30 is formed by forming a layer (in the illustrated example, the first fiber piece small amount-containing adhesive layer 302a and the second fiber piece small amount-containing pressure-sensitive adhesive layer 302b), and the adhesive layer 30 is adhered to the adherend. Not only the property may be improved, but also the adhesiveness with the base material layer 20 may be improved.

The above-mentioned multi-layered pressure-sensitive adhesive layer can also be applied to the double-sided pressure-sensitive adhesive tape 10'of the present invention. Only one of the pressure-sensitive adhesive layers 30 and 30'laminated on both sides of the base material layer 20 may have the above-mentioned multi-layer structure, and both may have the above-mentioned multi-layer structure (not shown).

The adhesive tape 10 thus obtained is provided in the form of a roll formed by winding a predetermined length such as 25 m or 50 m as shown in FIG. 8, similarly to the known adhesive tape.

To improve the expandability of the adhesive tape 10 when the adhesive tape is provided in a rolled state, when a rubber-based adhesive is used as the adhesive, or when the amount of the adhesive applied is large. A known release agent may be applied to the smooth surface 21 of the base material layer 20.

Further, as shown in FIG. 2 or 3, the present invention can form a double-sided adhesive tape 10'by laminating the pressure-sensitive adhesive layer 30 on both sides of the base material layer 20.

For example, the double-sided adhesive tape 10'of the second embodiment in which the pressure-sensitive adhesive layer 30 is laminated on both sides of the smooth surface 21 and the uneven surface 22 of the base material layer 20 shown in FIG. 2 is manufactured by the following method as an example. can do.

The adhesive on which the fiber pieces 32 are dispersed in advance is applied to the release sheet with a kiss roll coater, a gravure coater, a knife coater, a reverse roll coater, or the like, and dried.

The base material layer 20 in which the fiber pieces 32 are dispersed, which is manufactured by the method described with reference to FIG. 7 described above, is laminated and entangled therein.

Further, while rewinding this, the adhesive having the fiber pieces 32 dispersed in advance is applied onto the base material layer 20 with a kiss roll coater, a gravure coater, a knife coater, a reverse roll coater, or the like, and after drying. Wind up.

The double-sided adhesive tape 10'of the present invention is provided in the form of a rolled-up tape or sheet in which one or both sides are covered with the release sheet.

As the release sheet, a sheet in which a resin is anchor-coated on paper, a resin sheet having high peelability made of polyethylene, polypropylene, or the like is used, and a sheet in which a release agent such as a silicone-based material is coated on the surface is used if desired. ..

[Fiber pieces]
Examples of the fiber pieces 32 dispersed in the base material layer 20 and the pressure-sensitive adhesive layer 30 include acrylic, polyethylene, polypropylene, polyethylene terephthalate, 6-nylon, 6,6-nylon, polyparaphenylene terephthalamide, and poly. Examples include fibers such as acrylic nitrile, PMMA (polymethyl methacrylate), vinylon, rayon, hemp, silk, and hair.

The fiber piece 32 may be a single piece of short fibers such as cotton or linen or wool, or a monofilament composed of these short fibers or fragments of long fibers such as silk or chemical fibers, or the monofilaments may be twisted together. It may be a fragment of the obtained multifilament (thread).

Of these, the use of polyester-based or acrylic-based fiber pieces typified by rayon, nylon, polyethylene, polypropylene, and polyethylene terephthalate is particularly effective in adhering to the polyolefin resin film used as the base material layer 20, heat resistance, and solvent resistance. It is preferable from the viewpoint of sex and the like.

As the fiber piece 32 made of these raw materials, only the fiber piece 32 made of a single raw material may be used alone, but a plurality of types of fiber pieces 32 manufactured from different raw materials may be mixed and used. It may be a thing.

Further, as the fiber piece 32, a colored fiber piece 32 can be used, or a fiber piece 32 manufactured by using a pre-colored raw material can be used.

The amount of the fiber piece 32 added to the pressure-sensitive adhesive layer 30 is 100 parts by weight of the pressure-sensitive adhesive solid content of the pressure-sensitive adhesive tape 10 from the viewpoints of adhesive strength, toughness, hand-cutting property, touch (softness), and the like. On the other hand, it is preferably 0.5 to 10 parts by weight, and more preferably 1 to 5 parts by weight.

The amount of the fiber pieces added to the base material layer 20 is 0.2 to 10 parts by weight, preferably 0.5 to 3 parts by weight, based on 100 parts by weight of the solid content of the base material layer.

As the material used as the fiber piece 32 in the present invention, when an acrylic material described later is used as the adhesive, it is preferable to use an acrylic material, and the acrylic fiber piece is heat resistant. It is also preferable in terms of water resistance.

Further, it is preferable to use a polyester fiber in terms of water resistance, and rayon fiber can also be preferably used in terms of heat resistance.

Further, from the viewpoint of air permeability, it is preferable to use as the fiber piece 32 a hollow fiber piece in which the inside of the fiber is hollow (having a structure having holes in the cross section).

The hollow fiber piece used in the present invention is not particularly limited as long as the single yarn fiber has a hollow shape, and may be a porous hollow fiber piece having a large number of micropores on the surface of the fiber, or the surface thereof. It may be a non-porous hollow fiber piece that does not have a large number of micropores.

As the hollow fiber piece used in the present invention, for example, in addition to natural fibers such as hemp and cotton, synthetic fibers such as polyester, nylon, acrylic and vinyl chloride are preferably hollow.

The cross-sectional shape of the single yarn of the hollow fiber piece is not particularly limited as long as it is a hollow cross section, and examples thereof include circles, triangles, and squares.

Further, in the adhesive tape 10 of the present invention, as shown in FIG. 6, the fiber pieces 32 contained in the base material layer and the adhesive layer may be dispersed in layers along the longitudinal direction of the adhesive tape 10.

In this case, the air permeability in the longitudinal direction is improved rather than the thickness direction of the tape, and for example, the air embraced at the time of sticking can be efficiently released (discharged) in the longitudinal direction as well as the thickness direction of the tape. ..

10 Adhesive tape (10'double-sided adhesive tape)
20 Base material layer (polyolefin resin sheet)
21 Smooth surface 22, 22'Concave surface 23, 23'Concave groove 30, 30' Adhesive layer 301 Fiber fragment-containing adhesive layer 302 Fiber fragment-containing adhesive layer 302a First fiber fragment-containing adhesive layer 302b First 2 Adhesive layer containing a small amount of fiber pieces 31 Adhesive 32 Fiber pieces 40 Winding core 50 Extruder 51 Extruding dies 61, 61'Embossed roll 61a Convex 62 Rubber roll 64 Discharge electrode 65 Treatment roll 100 Adhesive tape 120 Base material layer 121 Smooth Surface 122 Concavo-convex surface 123 Concave groove 130 Adhesive layer 131 Adhesive 135 Non-woven fabric or split cloth 136 Polyester resin 140 Roll core 150 Process paper

Claims (19)

A base material layer made of an unstretched polyolefin resin film having a concavo-convex surface in which a plurality of concave grooves are formed at predetermined intervals on one side in a direction orthogonal to the longitudinal direction of the adhesive tape.
A pressure-sensitive adhesive layer formed on the uneven surface of the base material layer is provided.
Fiber pieces are dispersed in the base material layer and the pressure-sensitive adhesive layer, and the air permeability is caused by the gaps formed between the resin constituting the base material layer and the pressure-sensitive adhesive layer and the fiber pieces or the holes possessed by the fiber pieces . Adhesive tape characterized by having. The pressure-sensitive adhesive layer is formed on both sides of the base material layer,
The fiber pieces are dispersed in the base material layer and the pressure-sensitive adhesive layer, and the air permeability is provided by the gaps formed between the resin constituting the base material layer and the pressure-sensitive adhesive layer and the fiber pieces or the holes possessed by the fiber pieces . The adhesive tape according to claim 1, wherein the adhesive tape is provided. The adhesive tape according to claim 2, wherein the base material layer has the uneven surfaces on both sides. The pressure-sensitive adhesive tape according to any one of claims 1 to 3, wherein the pressure-sensitive adhesive layer contains 0.5 to 10 parts by weight of the fiber pieces with respect to 100 parts by weight of the solid content of the pressure-sensitive adhesive. The adhesive tape according to any one of claims 1 to 4, wherein the fiber diameter of the fiber piece is 0.05 to 100 denier. The adhesive tape according to any one of claims 1 to 5, wherein the length of the fiber piece is 1 to 10 mm. The adhesive tape according to any one of claims 1 to 6, wherein the base material layer contains 0.2 to 10 parts by weight of the fiber pieces with respect to 100 parts by weight of the base material layer solid content. The adhesive tape according to any one of claims 1 to 7, wherein the adhesive tape has an elongation of 30% or less in the longitudinal direction. The adhesive tape according to any one of claims 1 to 8, wherein the adhesive tape has a tensile strength in the longitudinal direction of 100 (N / 50 mm width) or more. The pressure-sensitive adhesive tape according to any one of claims 1 to 9, wherein the pressure-sensitive adhesive layer has a structure in which the amount of dispersed fibers of the fiber pieces is reduced on the side to be adhered to an adherend. The pressure-sensitive adhesive tape according to claim 10, wherein the pressure-sensitive adhesive layer has a structure in which the amount of dispersion of the fiber pieces is reduced on the side to be adhered to the base material layer. The fiber piece is made of any material selected from the group of PET, olefin resin, rayon, vinylon, and nylon, and one type of the fiber piece or a mixture of two or more types is used as the pressure-sensitive adhesive layer. The adhesive tape according to any one of claims 1 to 11, wherein the adhesive tape is dispersed in. The adhesive tape according to any one of claims 1 to 12, wherein the fiber piece is a hollow fiber piece. The adhesive tape according to any one of claims 1 to 13, wherein the fiber pieces are dispersed in a layer along the longitudinal direction of the adhesive tape. Adhesive is laminated on the uneven surface of a base material layer made of an unstretched polyolefin resin film having an uneven surface in which a plurality of concave grooves are formed at predetermined intervals in a direction orthogonal to the longitudinal direction of the adhesive tape on one side. The pressure-sensitive adhesive layer was formed, and the fiber pieces were dispersed in the base material layer and the pressure-sensitive adhesive layer, and formed between the resin constituting the base material layer and the pressure-sensitive adhesive layer and the fiber pieces. A method for producing an adhesive tape, which comprises providing breathability through a gap or a hole contained in the fiber piece . Adhesives are laminated on both sides of the base material layer to form a pressure-sensitive adhesive layer, and fiber pieces are dispersed in the base material layer and the pressure-sensitive adhesive layer to form the base material layer and the pressure-sensitive adhesive layer. The method for producing an adhesive tape according to claim 15, wherein the adhesive tape is made breathable by a gap formed between the resin and the fiber piece or a hole contained in the fiber piece. The claim is characterized in that the base material layer is made of an unstretched polyolefin resin film having uneven surfaces having a plurality of concave grooves formed at predetermined intervals on both sides in a direction orthogonal to the longitudinal direction of the adhesive tape. 16. The method for manufacturing an adhesive tape according to 16. It is characterized in that a plurality of types of adhesives having different dispersion amounts of the fiber pieces are laminated in multiple layers to form the pressure-sensitive adhesive layer in which the dispersion amount of the fiber pieces is reduced on the adhesive surface side with the adherend. The method for manufacturing an adhesive tape according to any one of claims 15 to 17. A plurality of types of adhesives having different dispersion amounts of the fiber pieces are laminated in multiple layers, and the pressure-sensitive adhesive layer in which the dispersion amount of the fiber pieces is reduced on the adhesive surface side of the base material layer with the uneven surface is formed. The method for producing an adhesive tape according to any one of claims 15 to 18, wherein the adhesive tape is formed.

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