JP2019194279A - Adhesive tape and method for producing adhesive tape - Google Patents

Abstract

To suppress elongation in a longitudinal direction with good hand tearability, and to prevent positional deviation and peeling after sticking and telescope (bamboo)-shaped deformation when being wound in a roll shape.SOLUTION: An adhesive tape 10 has an adhesive layer 30 formed on an uneven surface 22, in which a plurality of recessed grooves 23 are formed at predetermined intervals in a direction perpendicular to the longitudinal direction on one surface, of a base material layer 20 formed of a non-stretched polyolefin resin film. Due to distribution of a fiber piece 32 containing 0.2-10 pts.wt. of a fiber piece with a length of 1-10 mm and a thickness of 0.05-100 denier with respect to 100 pts.wt. of a solid content of the base material layer or adhesive layer, the adhesive tape has air permeability, increases a mechanical strength, can greatly suppress elongation in a longitudinal direction while maintaining hand tearability, as a result, positional deviation and peeling after sticking and telescope-shaped deformation when being wound in a roll shape are prevented.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a pressure-sensitive adhesive tape (including a double-sided pressure-sensitive adhesive tape) and a method for producing a pressure-sensitive adhesive tape, and more specifically, a pressure-sensitive adhesive tape used for masking or curing, packaging, etc. in architectural interior / exterior, architectural painting, vehicle painting, etc. For adhesive tapes that are required to have hand-cutting properties, such as those used in coatings, it is possible to prevent the expansion and contraction of the base material layer and improve the tensile strength while maintaining hand-cutting properties. The present invention relates to a pressure-sensitive adhesive tape capable of preventing a later position shift and peeling, and a telescope-like (bamboo shoot-like) deformation when wound into a roll, and a method for producing the same.

  As the adhesive tape used for masking and curing in the above-described 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 serving as a base material layer is generally used.

  As shown in FIG. 8, such an adhesive tape 100 is provided in a state of being wound around 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 it at a desired location.

  The adhesive tape 100 can be cut by using a dedicated cutter having a serrated blade, or by using a blade such as scissors or a cutter knife. In order to avoid the complication of using the adhesive tape, there is a demand for an adhesive tape having “hand cutting ability” that can be easily cut by hand.

  Examples of such adhesive tapes having a hand cutting property include Japanese paper, fiber woven fabric (hereinafter referred to as “split cloth”), and adhesive tapes using a synthetic resin film with a cut emboss as a base layer. .

  In particular, when the adhesive tape is cut by hand, it is desired that the adhesive tape can be cut linearly in a direction perpendicular to the longitudinal direction of the adhesive tape. The so-called “cloth tape” made of cloth is the mainstream, and a polyolefin resin film with a groove formed in a direction perpendicular to the longitudinal direction of the adhesive tape to provide hand-cutting properties is used as the base layer. Things are offered.

  In the above-mentioned fabric tape, PE film having a thickness of about 10 to 40 μm is laminated on both sides or one side of a split fabric formed by weaving fibers such as suf (rayon) or polyester with different thicknesses of warp and weft. A thing is used as a base material layer.

  In the case of a cloth tape using a base material layer with a split cloth manufactured by weaving warp and weft in this way, even when 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, in such a fabric tape, in order to obtain a base material layer from the above-described structure, a process of laminating a previously woven split cloth with a PE film is required, resulting in a multi-step manufacturing process. ， Cloth tape is expensive.

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

  As such an adhesive tape 100, as shown in FIG. 9, one surface is formed with a smooth surface 121, and the other surface is formed with a large number of concave grooves 123 in a direction perpendicular to the longitudinal direction of the adhesive tape. 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). Reference 1).

  Further, as described above, in the pressure-sensitive adhesive tape 100 using the polyolefin resin film having the uneven surface 122 as the base material layer 120, a structure for reducing the elongation in the longitudinal direction of the pressure-sensitive adhesive tape 100 while maintaining hand tearability. A pressure-sensitive adhesive tape 100 having the above has also been proposed.

  As such an adhesive tape 100, as shown in FIG. 10, an adhesive layer 130 formed on the uneven surface 122 of the polyolefin resin film substrate layer 120 is formed of a nonwoven fabric or a split cloth 135 and an adhesive 131. There is a thing which proposed 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 polyolefin resin film substrate layer 120. An adhesive tape in which an adhesive layer 130 is formed by applying an acrylic adhesive has also been proposed (Patent Document 3).

Japanese Patent Laid-Open No. 3-47885 JP-A-9-137133 Japanese Utility Model Publication No. 2001-172586

  In the pressure-sensitive adhesive tape 100 (FIG. 9) introduced as the above-mentioned Patent Document 1, 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 perpendicular to the longitudinal direction of the pressure-sensitive adhesive tape 100. Therefore, even when the adhesive tape 100 is cut by hand, the base material layer 120 is torn along the concave groove 123 so that it can be cut cleanly in a straight line.

  However, the polyolefin resin film employed as the base material layer 120 by the pressure-sensitive adhesive tape 100 described in Patent Document 1 is not stretched and itself is not only rich in elasticity compared to paper or split cloth, Since the concave groove 123 is formed in a direction orthogonal to the longitudinal direction of the adhesive tape 100, the base material layer 120 is further easily extended at the portion where the thin concave groove 123 is formed.

  As a result, in such an adhesive tape 100, the adhesive tape 100 is drawn when a tape having a required length is drawn out from the state wound in a roll shape as shown in FIG. The base material layer 120 extends in the longitudinal direction and is attached to the adherend in such a stretched state.

  And the adhesive tape 100 stuck with the base material layer stretched causes the base material layer 120 to shrink in an attempt to return to its original shape, resulting in a shift in the sticking position on the adherend over time, or The problem arises that the end of the adhesive tape 100 is lifted and peeled off. If such an adhesive tape is used for masking during painting, the coating position will be shifted.

  Moreover, 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 at 90 to 110 ° C. when the adhesive is applied to the base material layer. Since it is heated and dried, it is wound around the core 140 in a stretched state by about 0.3 to 1% due to the tension at the time of winding into a roll.

  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 is liable to be deformed into a telescope shape (bamboo child shape) as shown in FIG. Yes.

  On the other hand, if the adhesive tape 100 is wound at a low tension in order to prevent such a telescope-like (bamboo shoot-like) deformation, a nest (cavity) is likely to occur due to air entrainment, and both of them have poor appearance. The product cannot be shipped, and the defective rate generated in this way reaches about 1 to 7% at the maximum, so the yield is poor.

  In addition, with adhesive tapes used for masking or curing, it is necessary to remove and remove this from the adherend after the work such as painting has been completed. The above-mentioned adhesive tape 100 using the polyolefin resin film in which the above-mentioned concave groove 123 is formed in a direction orthogonal to the base material layer 120 is easy to stretch during work of peeling from the adherend, and is easy to cut. The peeling work becomes complicated.

  Thus, in the adhesive tape 100 of patent document 1 which used the polyolefin resin film in which the concave groove 123 was formed in the single side | surface as the base material layer 120, it is easy to extend in a longitudinal direction, As a result, the various problems mentioned above arise. Therefore, it is desired to suppress such elongation in the longitudinal direction of the adhesive tape 100.

  As a method for suppressing such elongation, it is conceivable to reduce the depth of the concave groove 123 or to increase the thickness of the entire polyolefin resin film as the base material layer 120. Although the elongation in the longitudinal direction can be suppressed, the hand cutting property of the pressure-sensitive adhesive tape 100 is lowered, and particularly in the configuration in which the thickness of the entire polyolefin resin film is increased, the followability to the surface of the adherend is lowered. Peeling is likely to occur.

  On the other hand, in the pressure-sensitive adhesive tape described in the above-mentioned Patent Document 2 (FIG. 10), the non-woven fabric or the split cloth 135 is embedded in the pressure-sensitive adhesive layer 130 to reinforce the pressure-sensitive adhesive layer 130. Occurrence of elongation in the longitudinal direction is suppressed.

  However, in this configuration, an operation of forming the adhesive layer 130 by integrating the nonwoven fabric or the split cloth 135 and the adhesive 131 is necessary, and as shown in FIG. Since the pressure-sensitive adhesive layer 130 is formed by laminating on the paper 150 and the like, it is necessary to perform the operation such as laminating on the polyolefin resin film to be the base material layer 120. As a result of an increase in the number of processes at the time and an increase in manufacturing cost, the pressure-sensitive adhesive tape 100 becomes expensive.

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

  Moreover, since the deformability of the pressure-sensitive adhesive layer 130 is greatly reduced by burying the non-woven fabric or the split cloth 135, the followability to the surface of the adherend is reduced, peeling or floating is likely to occur, and the function as a masking tape is achieved. There is also the possibility of damage.

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

  In addition, after the polyester resin 136 is applied as a base layer, a solvent-type adhesive is subsequently applied to form the adhesive layer 130, so that the base polyester resin 136 is affected by the solvent in the adhesive 131. The polyester resin 136 is softened by a 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.

  In addition, the pressure-sensitive adhesive tapes described in Patent Documents 1 to 3 use a polyolefin resin as a base material and have insufficient air permeability. Easily embraced with air, lacking in beauty, and combined with the expansion of entrapped air, outgas from the adherend, and thermal expansion of the substrate, easily causing swelling and peeling of the adhesive tape 100 There was a problem.

  Accordingly, the present invention has been made to eliminate the above-mentioned drawbacks of the prior art, and as described above, a polyolefin resin film in which one surface is a smooth surface and the other surface is an uneven surface is used as a base material layer. In the pressure-sensitive adhesive tape in which the pressure-sensitive adhesive layer is formed on the uneven surface of the base material layer, the elongation in the longitudinal direction is suppressed, specifically, the elongation is 70% or less while maintaining the hand-cut property in the width direction of the pressure-sensitive adhesive tape. , Preferably 50% or less, more preferably 30% or less, and improved tensile strength, specifically 100 (N / 50mm width) or more, preferably 130 (N / 50mm width) or more By providing an adhesive tape, it is possible to prevent displacement and peeling after sticking, and it is possible to prevent the adhesive tape wound in a roll shape from being deformed into a telescope shape (bamboo child shape) as shown in FIG. And painting work After completion etc., a good workability during peeling from an adherend, further an object to provide an adhesive tape (including a double-sided adhesive tape) and the adhesive tape manufacturing method of having air permeability.

  Hereinafter, means for solving the problem will be described together with reference numerals used in the embodiment for carrying out the invention. This code is used to clarify the correspondence between the description of the scope of claims and the description of the mode for carrying out the invention. Needless to say, this code is limited to the interpretation of the technical scope of the present invention. Not used.

In order to achieve the above object, the pressure-sensitive adhesive tape 10 of the present invention comprises:
A base material layer 20 made of an unstretched polyolefin resin film having a concavo-convex surface 22 having a plurality of concave grooves 23 formed at predetermined intervals in a direction orthogonal to the longitudinal direction of the adhesive tape on one side; The pressure-sensitive adhesive layer 30 is formed on the concavo-convex surface 22, and the fiber pieces 32 are dispersed in the base material layer 20 and the pressure-sensitive adhesive layer 30, thereby having air permeability (invention). Item 1, see FIG.

  In the pressure-sensitive 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 ′. Alternatively, a double-sided pressure-sensitive adhesive tape 10 ′ having air permeability may be used (see claim 2 and FIG. 2).

  Further, in the double-sided pressure-sensitive adhesive tape 10 ′, the base material layer 20 may have the uneven surfaces 22 and 22 ′ on both surfaces. (See claim 3, FIG. 3).

  In the present invention, the “fiber piece” includes a single filament of a short fiber, a monofilament made of a short fiber or a fragment of long fiber, and a multifilament (yarn) fragment obtained by twisting monofilaments.

  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 0.5 to 10 parts by weight of the fiber pieces 32, preferably 100 parts by weight of the solid content of the pressure-sensitive adhesive 31 Contains 1 to 5 parts by weight (claim 4, FIG. 1).

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

  “Denier” is the mass of a 9000 m yarn expressed in grams. The value of 1/9 of the above “denier” is the “tex” used in JIS and ISO (1000 m yarn mass). In gram)).

  The length of the fiber piece 32 may be 1 to 10 mm, preferably 1 to 7 mm, more preferably 2 to 5 mm (Claim 6).

  In addition, the said fiber diameter and fiber length can mix and use various things.

  Furthermore, the base material layer contains 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. Item 7, FIG. 1).

  The pressure-sensitive adhesive tape 10 and the double-sided pressure-sensitive adhesive tape 10 ′ of the present invention have an elongation in the longitudinal direction of the pressure-sensitive adhesive tape of 30% or less, preferably 20% or less, more preferably 16% or less.

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

  The pressure-sensitive adhesive layer 30 of the pressure-sensitive adhesive tape 10 of the present invention (in the case of the double-sided pressure-sensitive adhesive tape 10 ′, the pressure-sensitive adhesive layers 30 and 30 ′) may have the fiber pieces 32 uniformly dispersed throughout the thickness direction. (Refer to FIG. 1), preferably, the dispersion amount of the fiber pieces 32 is preferably reduced on the sticking side (lower side of the paper) to the adherend (see claim 10, FIG. 4 and FIG. 5, double-sided). The adhesive tape 10 'is not shown.)

  Furthermore, 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 dispersion amount of the fiber pieces 32 is reduced on the sticking side (upper side in the drawing) with the base material layer 20. It is preferable to have a configuration (see claim 11, FIG. 5, double-sided adhesive tape 10 ′ is not shown).

  The fiber pieces 32 dispersed in the base material layer 20 and the pressure-sensitive adhesive layer 30 (the pressure-sensitive adhesive layers 30 and 30 ′ in the case of the double-sided pressure-sensitive adhesive tape 10 ′) include acrylic, PET, olefinic resin, rayon, and vinylon. A material made of any material selected from the group of nylon can be used, and one 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.

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

Moreover, the manufacturing method of the adhesive tape 10 of this invention is as follows.
On the concavo-convex surface 22 of the base layer 20 made of an unstretched polyolefin resin film having a concavo-convex surface 22 having a plurality of concave grooves 23 formed at predetermined intervals in a direction orthogonal to the longitudinal direction of the adhesive tape on one side, The pressure-sensitive adhesive is laminated to form the pressure-sensitive adhesive layer 30, and fiber pieces 32 are dispersed in the base material layer 20 and the pressure-sensitive adhesive layer 30 (claim 15).

  In addition, pressure-sensitive adhesive is laminated on both surfaces of the base material layer 20 to form pressure-sensitive adhesive layers 30 and 30 ′, and fiber pieces 32 are dispersed in the base material layer 20 and the pressure-sensitive adhesive layers 30 and 30 ′. (Claim 16).

  Furthermore, the base material layer 20 may be made of an unstretched polyolefin resin film having a concavo-convex 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 both surfaces. (Claim 17).

  Formation of the pressure-sensitive adhesive layer 30 (in the case of the double-sided pressure-sensitive adhesive tape 10 ′, pressure-sensitive adhesive layers 30, 30 ′) is performed by laminating a plurality of types of pressure-sensitive adhesives in which the dispersion amount of the fiber pieces 32 is changed in multiple layers. It is good also as what forms the said adhesive layer 30 in which the dispersion amount of the said fiber piece 32 reduces by the adhesion surface side with a to-be-adhered body (refer Claim 18, FIG.4 and FIG.5, about double-sided adhesive tape 10 ') Not shown.)

  Similarly, a plurality of types of pressure-sensitive adhesives in which the dispersion amount of the fiber pieces 32 is changed 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 decreasing pressure-sensitive adhesive layer 30 (in the case of double-sided pressure-sensitive adhesive tape 10 ', pressure-sensitive adhesive layers 30, 30') may be formed (see claim 19, FIG. 5, double-sided pressure-sensitive adhesive tape 10 'not shown). .)

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

  The pressure-sensitive adhesive tape 10 (and the double-sided pressure-sensitive adhesive tape 10 ') having the above-described configuration can reduce the elongation in the longitudinal direction while maintaining the hand-cut property in the width direction, and further has air permeability. .

  Such suppression of elongation due to the dispersion of the fiber pieces exhibits a behavior as if the base material layer and the pressure-sensitive adhesive layer were highly crosslinked by the dispersion of the fibers (in this specification, the state indicating such a behavior is referred to as “ It is called “pseudo-crosslinked state”, and the physical elongation is suppressed. Compared with chemical cross-linking, it does not block functional groups that contribute to adhesive strength and reduces the expression of adhesive strength. This is advantageous in that it does not occur.

  Thus, the pressure-sensitive adhesive tape 10 (and the double-sided pressure-sensitive adhesive tape 10 ') of the present invention has been able to reduce the elongation in the longitudinal direction, so that it is difficult to stretch when pulled out from the rolled state, and is stuck in the stretched state. It is possible to prevent the occurrence of peeling due to the sticking position shift caused by shrinking of the attached adhesive tape and the lifting of the end, and also when winding with tension to prevent the formation of a winding nest. Since it is difficult to cause elongation, it is possible to suitably prevent a telescope-like (bamboo-child-like) deformation caused by shrinkage of the adhesive tape 10 (and the double-sided adhesive tape 10 ′) after being wound into a roll. As a result, the yield was improved by suppressing the occurrence of defective products.

  In addition, since the tensile strength in the longitudinal direction of the adhesive tape 10 (and the double-sided adhesive tape 10 ′) can be improved, the adhesive tape 10 used as a masking tape after the work such as painting is completed, for example. When peeling (and removing) the double-sided pressure-sensitive adhesive tape 10 'from the adherend, the pressure-sensitive adhesive tape can be easily peeled and removed without breaking the pressure-sensitive adhesive tape.

  In addition, since the pressure-sensitive adhesive tape 10 (and the double-sided pressure-sensitive adhesive tape 10 ') of the present invention has air permeability, it can prevent air entrainment generated at the time of sticking and has a beautiful appearance after sticking. In addition, the adhesive tape 10 (and the double-sided adhesive tape 10 ′) that does not cause the problem of peeling due to the outgassing of the adherend and the expansion of the air embraced can be provided.

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

  In particular, the addition amount of the fiber pieces 32 is 0.5 to 10 parts by weight, preferably 1 to 5 parts by weight, or 100 parts by weight of the base layer solids with respect to 100 parts by weight of the solid content of the pressure-sensitive adhesive 31. On the other hand, a relatively small amount that only contains 0.2 to 10 parts by weight of the fiber piece is used, and a fiber piece 32 having a relatively small diameter of 0.05 to 100 denier is used as the fiber piece 32 to be dispersed. Thus, the elongation of the adhesive tape 10 (and the double-sided adhesive tape 10 ′) can be suppressed and the tensile strength can be improved without sacrificing the hand cutting property of the adhesive tape 10 (and the double-sided adhesive tape 10 ′). did it.

  The fiber pieces 32 to be added to the adhesive 31 have a relatively short length of 1 to 10 mm, preferably 1 to 7 mm, more preferably 2 to 5 mm. On the other hand, even when the fiber pieces having this length are dispersed, the required elongation rate can be suppressed and the tensile strength can be improved.

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

  In the example in which the amount of dispersion of the fiber pieces 32 in the pressure-sensitive adhesive layer 30 (in the case of the double-sided pressure-sensitive adhesive tape 10 ′, the pressure-sensitive adhesive layer 30, 30 ′) is reduced on the adhesion surface side with the adherend, Good adhesion to the adherend could also be maintained by the dispersion of the fiber pieces 32.

  Further, the dispersion amount of the fiber pieces 32 in the pressure-sensitive adhesive layer 30 (in the case of the double-sided pressure-sensitive adhesive tape 10 ′, the pressure-sensitive adhesive layer 30, 30 ′) is also reduced on the adhesive surface side of the base material layer 20 with the uneven surface 22. In the example having the above configuration, strong adhesion between the uneven surface 22 of the base material layer 20 and the pressure-sensitive adhesive layer 30 can be obtained, and when the pressure-sensitive adhesive tape 10 is peeled off from the adherend, delamination occurs and the pressure-sensitive adhesive layer Occurrence of the so-called “glue residue” in which a part of 30 remains attached to the surface of the adherend can be suitably prevented.

  In addition, there are many processes as a conventional base material layer, and an adhesive tape that can be used as an alternative to an existing woven tape can be obtained without weaving high-cost fibers in length and breadth (background), resulting in high economic effects.

  In addition, in the mixed resin of polypropylene and polyethylene that has been tried in the past as a base material layer in order to solve the above problems, due to the difference in melting point, the deflection generated in the extruded film, the wrinkle of winding, the wrinkle in the line (Abara, The flakes of the present application substituting for polypropylene were able to achieve the above-mentioned effect and extremely reduce the occurrence of such wrinkles.

The cross-sectional schematic diagram of the adhesive tape 10 of 1st Embodiment of this invention. The cross-sectional schematic diagram of the double-sided adhesive tape 10 'of 2nd Embodiment of this invention. The cross-sectional schematic diagram of the double-sided adhesive tape 10 'of 3rd Embodiment of this invention. The cross-sectional schematic diagram of the adhesive tape 10 of another embodiment of this invention. The cross-sectional schematic diagram of the adhesive tape 10 of another embodiment of this invention. The cross-sectional schematic diagram of the adhesive tape 10 of another embodiment of this invention. Explanatory drawing of the manufacturing method of the polyolefin resin film used as a base material layer. The perspective view of the adhesive tape of the state wound up in roll shape. Explanatory drawing of the conventional adhesive tape (corresponding to patent document 1). Explanatory drawing of the conventional adhesive tape (corresponding to patent document 2). Explanatory drawing of the conventional adhesive tape (corresponding to patent document 3). Explanatory drawing of the adhesive tape deform | transformed into the telescope shape (bamboo child shape). Explanatory drawing of the manufacturing method of the conventional adhesive tape (corresponding to FIG. 3 of patent document 2).

  Next, embodiments 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 the other surface is formed with a number of concave grooves 23 in a direction perpendicular to the longitudinal direction of the adhesive tape. The polyolefin resin film having the concavo-convex surface 22 can be used as the base material layer 20, and the adhesive tape 30 having the adhesive layer 30 can be provided on the concavo-convex surface 22 of the base material layer 20.

  And the pressure-sensitive adhesive tape 10 of the present invention, by dispersing the fiber pieces 32 in the base material layer 20 and the pressure-sensitive adhesive layer 30 described above, suppressing the elongation in the longitudinal direction of the pressure-sensitive adhesive tape 10 while maintaining the hand cutting property, As an example, an adhesive tape having a total thickness of 120 to 600 μm, which has improved tensile strength and air permeability. In addition, total thickness is not limited to this, It can set to appropriate thickness according to a use etc.

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

  Further, as a third embodiment of the present invention, as shown in FIG. 3, the both surfaces are uneven surfaces 22 and 22 ′ in which a large number of concave grooves 23 and 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 adhesive layers 30 and 30 ′ are provided on both surfaces of the base material layer 20, and fiber pieces are contained in the adhesive material of the base material layer 20 and the adhesive layers 30 and 30 ′. A double-sided pressure-sensitive adhesive tape 10 'having air permeability and hand cutting properties in which 32 is dispersed can also be obtained.

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

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

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

  Examples of preferred polyolefin resins include polyethylene resins.

  The molecular weight of the polyolefin resin is not particularly limited as long as it can be formed into a film, but it is generally in the range of 0.2 to 20 g / 10 min, preferably 1 in terms of melt index, which is a measure representing the resin flowability. -10 g / 10 min (both are 2.16 kg, temperature is 190 ° C.).

  The thickness of the polyolefin resin sheet used as the base layer 20 of the pressure-sensitive adhesive tape 10 and the double-sided pressure-sensitive 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. It can be set to an appropriate thickness depending on the like.

  In this polyolefin resin sheet, one surface is a smooth surface 21 and the other surface is a concavo-convex surface 22, and a number of concave grooves 23 that are orthogonal to the longitudinal direction of the adhesive tape 10 are formed on the concavo-convex surface 22. ing.

  In the case of the double-sided pressure-sensitive adhesive tape 10 ′, both surfaces of the polyolefin resin sheet are uneven surfaces 22, 22 ′, and the uneven surfaces 23, 22 ′ have concave grooves 23 that are perpendicular to the longitudinal direction of the adhesive tape 10. Many may be formed.

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

  If the interval between the concave grooves 23 is less than 0.5 mm, the strength in the longitudinal direction of the adhesive tape 10 is insufficient, and if it exceeds 5 mm, the original hand cutting property may be insufficient. The interval can be set to 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-described polyolefin resin as a raw material and having one surface as a smooth surface 21 and the other surface as an uneven surface 22.

  In the example shown in FIG. 7, after the polyolefin resin previously kneaded with the fiber pieces 32 is melted and extruded into a film shape from the extrusion die 51 of the extruder 50, the extruded film is not yet completely cooled to room temperature. By passing between the embossing roll 61 and the rubber roll 62, the concave surface having a shape corresponding to the convex surface 61a provided on the surface of the embossing roll 61 on the smooth surface 21 on the contact side with the rubber roll 62 and on the surface side with the embossing roll 61 is provided. A groove 23 is formed.

  In the case where the concave and convex surfaces 22 and 22 ′ are formed on both surfaces of the base material layer 20, for example, an embossing roll 61 ′ is prepared instead of the rubber roll 62, and the embossing roll 61 and the embossing roll 61 ′ are passed through. Thus, the concave grooves 23 and 23 'can be formed on both sides.

  The uneven surface 22 formed on the polyolefin resin film has a discharge electrode 64 and a smooth surface, as shown in FIG. 7, in order to prevent the delamination from occurring due to good conformity with the adhesive. Corona discharge treatment may be performed when passing between the treatment rolls 65.

  By performing the corona discharge treatment in this manner, it is possible to improve the affinity between the uneven surface 22 and the pressure-sensitive adhesive 31 described later (adhesiveness of the adhesive to the uneven surface, wettability of the uneven surface). It is possible to prevent the occurrence of so-called “glue residue”, in which delamination occurs when the film is peeled off from the adherend and the pressure-sensitive adhesive remains on the surface of the adherend.

  As described above, the corona discharge treatment for the concavo-convex surface 22 is preferable in order to improve the familiarity with the pressure-sensitive adhesive layer 30, but this corona discharge treatment is not essential in the pressure-sensitive adhesive tape 10 of the present invention. What is necessary is just to process.

  The dying number (wetting index) of the base material layer 20 is preferably larger on the concavo-convex surface 22 than on the smooth surface 21, and the preferable dyne number (wetting index) is, for example, 30 Dyn / cm or less on the smooth surface 21. When the uneven surface 22 is 35 Dyn / cm or more and the wetting index of the smooth surface 21 is greater than 30 Dyn / cm, the smooth surface 21 and the adhesive layer 30 are more than necessary when the adhesive tape 10 is wound into a roll. Due to the occurrence of a so-called “blocking phenomenon” that results in strong adhesion, it becomes difficult to deploy the adhesive tape 10.

  On the other hand, if the wetting index of the concavo-convex surface 22 is less than 35 Dyn / cm, the adhesive force of the pressure-sensitive adhesive 31 to the concavo-convex surface 22 is insufficient, which causes the aforementioned “glue residue” or the like.

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

  The improvement of affinity by the application of such a primer is also a well-known method, and it is possible to use various known primers, for example, a rubber-based primer such as nitrile rubber, an acrylic resin-based primer, etc. it can.

  As in the case of the corona discharge treatment described above, in the present invention, primer application is not essential, and can be appropriately performed as necessary. In addition, the primer is used instead of the corona discharge treatment described above or in combination with the corona discharge treatment. Application may be performed.

  Moreover, 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 master batch and supplied to the extruder hopper. The fiber pieces 32 to be used must exceed the heat melting temperature of 200 ° C. of the polyolefin resin. From this viewpoint, polyester (Tg 220 ° C.), nylon (Tg 220 ° C.), acrylic (thermosetting), Most preferred is rayon which is unrelated to heat melting, but from the viewpoint of waterproofness, polypropylene and polyester are preferred.

  The base material layer 20 in which the fiber pieces 32 are dispersed is an unstretched polyolefin resin film, which can be manufactured 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 a polyolefin resin film configured as described above, or on both surfaces of the base material layer 20 in the case of a double-sided pressure-sensitive adhesive tape. Layer 30 is formed.

Adhesive Various known adhesives can be used as the adhesive constituting the adhesive layer 30, and examples thereof include acrylic adhesives, vinyl ether adhesives, silicone adhesives, rubber adhesives, and the like. be able to.

  The form of the pressure-sensitive adhesive to be used is not particularly limited, and any type such as a solution-type pressure-sensitive adhesive, an emulsion-type pressure-sensitive adhesive, and a hot-melt type pressure-sensitive adhesive may be used.

Method of Laminating Adhesive Layer The above-described adhesive layer 30 is formed by, for example, using the above-mentioned base material layer with an adhesive in which fibers are dispersed in advance as in the first embodiment of the present invention shown in FIG. It is formed by applying to the concave / convex surface 22 of the base material layer 20 by coating on the concave / convex surface 22 of the substrate 20, or after coating on the process paper.

  The pressure-sensitive adhesive layer 30 may be formed of a single-layer pressure-sensitive adhesive layer 30 formed by applying one layer of pressure-sensitive adhesive in which fiber pieces 32 are dispersed as shown in FIG. 4 and FIG. 5, two or more 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 adhesive layer 30 has a gradient. It can also be used.

  The fiber pieces 32 described above have air permeability by being dispersed in the base material layer 20 and the pressure-sensitive adhesive layer 30, and the base material layer 20 and the pressure-sensitive adhesive layer 30 are further reinforced to reduce elongation. At the same time, an improvement in tensile strength can be obtained, while the pressure-sensitive adhesive layer 30 is caused to undergo the above-described pseudo-crosslinking, which can cause a decrease in followability and adhesion force to the surface of the adherend.

  Therefore, as shown in FIG. 4, the pressure-sensitive adhesive layer 30 is formed by laminating a pressure-sensitive adhesive having a relatively large content of fiber pieces 32 on the base material layer 20 side (the upper side of the paper) (shown in the figure). In the example, the fiber piece-containing pressure-sensitive adhesive layer 301) is used, while the pressure-sensitive adhesive layer (in the illustrated example) is formed by laminating a pressure-sensitive adhesive with a small amount of fiber pieces 32 on the side to be adhered to the adherend (the lower side of the paper) A pressure-sensitive adhesive layer 302) containing a small amount of fiber pieces may be used to form a multi-layered pressure-sensitive adhesive layer.

  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 in the thickness direction of the pressure-sensitive adhesive layer 30. The pressure-sensitive adhesive layer (fiber piece-containing pressure-sensitive adhesive layer 301 in the example shown in the figure) is provided, and a pressure-sensitive adhesive formed by applying and laminating a pressure-sensitive adhesive with a small amount of fiber pieces to the outside. The adhesive layer 30 having a three-layer structure in which the layers (in the illustrated example, the first fiber piece-containing pressure-sensitive adhesive layer 302a and the second fiber piece-containing pressure-sensitive adhesive layer 302b) are formed is formed and adhered to the adherend It is good also as what improves not only the property but adhesiveness with the base material layer 20. FIG.

  In addition, the adhesive layer having the multilayer structure described above can also be applied to the double-sided adhesive tape 10 'of the present invention. Note that only one of the pressure-sensitive adhesive layers 30 and 30 ′ laminated on both surfaces of the base material layer 20 may have the above-described multilayer structure, or both may have the above-described multilayer 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.

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

  Moreover, as shown in FIG. 2 or FIG. 3, the present invention can be a double-sided pressure-sensitive adhesive tape 10 ′ by laminating an adhesive layer 30 on both surfaces of a base material layer 20.

  For example, the double-sided pressure-sensitive adhesive tape 10 ′ of the second embodiment in which the pressure-sensitive adhesive layer 30 is laminated on both 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 pressure-sensitive adhesive in which the fiber pieces 32 are dispersed in advance is applied to the release sheet with a kiss roll coater, gravure coater, knife coater, reverse roll coater, and the like, and dried.

  The base material layer 20 in which the fiber pieces 32 are dispersed is manufactured by the method described with reference to FIG.

  Further, while rewinding, the adhesive in which the fiber pieces 32 are dispersed in advance is applied onto the base material layer 20 by a kiss roll coater, gravure coater, knife coater, reverse roll coater, etc. Roll up.

  The double-sided pressure-sensitive adhesive tape 10 ′ of the present invention is provided in the form of a tape or sheet rolled up by covering one side or both sides with the release sheet.

  The release sheet is made of a paper-anchored resin, a resin sheet made of polyethylene, polypropylene, or the like having a high release property, and if desired, a surface coated with a release agent such as a silicone material. .

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

  The fiber pieces 32 may be monofilaments made of short fibers such as cotton or hemp or wool, or short filaments or fragments of long fibers such as silk or chemical fibers, or twisted monofilaments. It may be a fragment of the obtained multifilament (yarn).

  Of these, polyester fiber typified by rayon, nylon, polyethylene, polypropylene, and polyethylene terephthalate, and the use of acrylic fiber fragments, adhesion to the polyolefin resin film as the base material layer 20, heat resistance, and solvent resistance. From the viewpoint of properties and the like.

  As the fiber pieces 32 made of these raw materials, only the fiber pieces 32 made of a single raw material may be used alone, but two or more types of fiber pieces 32 made of different raw materials are mixed and used. It is good as a thing.

  Further, the fiber piece 32 may be a colored one, or may be a fiber piece 32 produced using a previously colored raw material.

  The amount of the fiber pieces 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 from the viewpoint of the pressure-sensitive adhesive strength, toughness, hand cutting property, and touch (softness) of the pressure-sensitive adhesive tape 10 to be obtained. The amount is preferably 0.5 to 10 parts by weight, more preferably 1 to 5 parts by weight.

  Further, 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 with respect to 100 parts by weight of the solid content of the base material layer.

  In addition, as a material used as the fiber piece 32 in this invention, when using the acrylic type mentioned later as an adhesive, use of an acrylic type is preferable, and use of an acrylic type fiber piece is heat resistant, Also preferred from the viewpoint of water resistance.

  In addition, the use of a polyester-based material is preferable in terms of water resistance, and rayon fibers can also be suitably used in terms of heat resistance.

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

  The hollow fiber piece used in the present invention is not particularly limited as long as the single 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. It may be a non-porous hollow fiber piece having a large number of micropores.

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

  In addition, about the cross-sectional shape of the single yarn of a hollow fiber piece, if it is a hollow cross section, it will not specifically limit, A round, a triangle, and a square are illustrated.

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

  In this case, the air permeability in the longitudinal direction is improved compared to the thickness direction of the tape, and for example, the air entrapped at the time of sticking can be efficiently released (discharged) in the longitudinal direction in addition to 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 'Concavity and convexity surface 23, 23' Concave groove 30, 30 'Adhesive layer 301 Fiber piece containing adhesive layer 302 Small amount of fiber piece containing adhesive layer 302a First small amount of fiber piece containing adhesive layer 302b No. 1 2 small amount of fiber-containing pressure-sensitive adhesive layer 31 pressure-sensitive adhesive 32 fiber piece 40 winding core 50 extruder 51 extrusion die 61, 61 ′ embossing roll 61a ridge 62 rubber roll 64 discharge electrode 65 treatment roll 100 pressure-sensitive adhesive tape 120 base material layer 121 smooth Surface 122 Concavity and convexity surface 123 Concave groove 130 Adhesive layer 131 Adhesive 135 Non-woven fabric or split cloth 136 Polyester resin 140 Core 150 150 Process paper

Claims (19)

A base 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 in a direction orthogonal to the longitudinal direction of the adhesive tape on one side;
Comprising an adhesive layer formed on the uneven surface of the base material layer,
A pressure-sensitive adhesive tape, wherein fiber pieces are dispersed in the base material layer and the pressure-sensitive adhesive layer and have air permeability. The pressure-sensitive adhesive layer is formed on both surfaces of the base material layer;
The pressure-sensitive adhesive tape according to claim 1, wherein fiber pieces are dispersed in the base material layer and the pressure-sensitive adhesive layer and have air permeability.   The pressure-sensitive adhesive tape according to claim 2, wherein the base material layer has the uneven surface on both sides.   The said adhesive layer contains 0.5-10 weight part of said fiber pieces with respect to 100 weight part of solid content of an adhesive, The adhesive tape of any one of Claims 1-3 characterized by the above-mentioned.   The pressure-sensitive adhesive tape according to claim 1, wherein the fiber piece has a fiber diameter of 0.05 to 100 denier.   The pressure-sensitive adhesive tape according to any one of claims 1 to 5, wherein the fiber piece has a length of 1 to 10 mm.   The pressure-sensitive adhesive tape according to claim 1, wherein the base material layer contains 0.2 to 10 parts by weight of the fiber piece with respect to 100 parts by weight of the solid content of the base material layer.   The adhesive tape according to any one of claims 1 to 7, wherein an elongation in the longitudinal direction of the adhesive tape is 30% or less.   The pressure-sensitive adhesive tape according to any one of claims 1 to 8, wherein the pressure-sensitive 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 configuration in which a dispersion amount of the fiber pieces is reduced on a sticking side to an adherend.   The pressure-sensitive adhesive tape according to claim 10, wherein the pressure-sensitive adhesive layer has a configuration in which a dispersion amount of the fiber pieces is reduced on a bonding side with the base material layer.   The above-mentioned pressure-sensitive adhesive layer is made of any material selected from the group consisting of PET, olefin-based resin, rayon, vinylon, and nylon, and one or a mixture of two or more of the fiber pieces. The pressure-sensitive adhesive tape according to any one of claims 1 to 11, wherein the pressure-sensitive adhesive tape is dispersed.   The pressure-sensitive adhesive tape according to claim 1, wherein the fiber piece is a hollow fiber piece.   The pressure-sensitive adhesive tape according to claim 1, wherein the fiber pieces are dispersed in layers along the longitudinal direction of the pressure-sensitive adhesive tape.   Adhesive is laminated on the concavo-convex surface of a base 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 in a direction orthogonal to the longitudinal direction of the adhesive tape on one side. Thus, a pressure-sensitive adhesive layer is formed, and fiber pieces are dispersed in the base material layer and the pressure-sensitive adhesive layer.   The pressure-sensitive adhesive according to claim 15, wherein a pressure-sensitive adhesive is laminated on both surfaces 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. Tape manufacturing method.   The base material layer is made of an unstretched polyolefin resin film having a concavo-convex 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 both surfaces. The manufacturing method of the adhesive tape of 16.   A plurality of types of pressure-sensitive adhesives in which the dispersion amount of the fiber pieces is changed are laminated in multiple layers to form the pressure-sensitive adhesive layer in which the dispersion amount of the fiber pieces decreases on the adhesion surface side with the adherend. The manufacturing method of the adhesive tape of any one of Claims 15-17 to do.   The pressure-sensitive adhesive layer in which a plurality of types of pressure-sensitive adhesives in which the dispersion amount of the fiber pieces is changed is laminated in multiple layers, and the dispersion amount of the fiber pieces decreases on the adhesive surface side of the base material layer with the uneven surface. The method for producing a pressure-sensitive adhesive tape according to any one of claims 15 to 18, wherein the pressure-sensitive adhesive tape is formed.

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