JP3205388U - Adhesive tape laminate - Google Patents

Abstract

Provided is an adhesive tape laminate that has excellent adhesion to a rough surface and can be smoothly rewound from a wound state. A first adhesive tape 1 having an adhesive layer 1b on one side of a substrate 1a and a second adhesive tape 2 having an adhesive layer 2b on one side of a substrate 2a are provided. Adhesive layered so that the adhesive layer 2b of the second adhesive tape 2 is in contact with the back surface of the adhesive tape 1 and the parting portion 2c of the second adhesive tape 2 protrudes from the parting portion 1c of the first adhesive tape 1 The adhesive strength of the adhesive layer 2b of the second adhesive tape 2 to the back surface of the first adhesive tape 1 measured according to JIS Z 0237 (2000) is 1.5 to 8 N / It is 25 mm. [Selection] Figure 1

Description

  The present invention relates to a pressure-sensitive adhesive tape laminate that is excellent in adhesiveness to a rough surface and can be smoothly rewound from a wound state, and is useful for, for example, coating masking of a rough surface.

  In addition to various road markings such as pedestrian crossings and center lines, and division line indications in parking lots, etc., when painting structures such as outer walls, floors, and bridges of buildings, do not apply parts to which paint is applied. A masking tape (adhesive tape) is used to form a so-called “parting line” that is a boundary line with a portion.

  Usually, the road surface and the outer wall surface of a building are not smooth, but are rough surfaces made of asphalt, concrete, mortar, or the like. When painting such a rough surface, first apply a primer to improve adhesion to the rough surface, then apply a colored paint, and then apply a protective layer to prevent deterioration and dirt. It is common. Also, for safety considerations, when forming road surface indications such as roads and parking lots, a colored aggregate is applied for the purpose of imparting slip resistance after applying a primer, and in some cases an aggregate layer is further added. Apply paint on top.

  When performing such multi-layer coating, the coating strength of the undercoat layer and the topcoat layer is different and the layer strength is increased, so the coating film is pulled and cracked when the masking tape is peeled off. Or the appearance of the parting line may deteriorate. Moreover, the end face (parting surface) of the coating is layered, and the appearance is not good. For these problems, after the primer layer is applied, the masking tape is peeled and removed, and the masking tape is applied again at a position slightly shifted from the parting line of the primer layer to the uncoated part side. This can be solved by applying a coating layer. However, this method is not preferable because the masking tape needs to be re-applied and the work efficiency is lowered. Therefore, in order to improve this point, the following adhesive tape laminate has been proposed.

  In Patent Document 1, an upper masking tape is temporarily attached on a lower masking tape in which an adhesive layer is formed on one side of a base material. A masking material for coating is described which projects from the upper edge of the upper masking tape so that the edge of the upper masking tape is opposite to the outer edge of the upper masking tape. Then, this masking material is applied to the coating part, the lower layer is applied, the non-adhesive part of the upper masking tape is used as a key, and the upper masking tape is exposed by exposing the cut edges of the lower masking tape. It is described that the multi-layer coating can be easily performed by one masking operation.

  Patent Literature 2 describes a masking tape obtained by laminating a lower layer tape and an upper layer tape, and a laminated tape in which the adhesive layer of the upper layer tape is thinner than the lower layer tape. Further, there is an example (FIG. 4) in which the upper layer tape is slightly shifted and laminated on the upper surface of the lower layer tape, and it is described that the coating finish is improved when the end surface of the undercoat is covered with the upper coating agent. Moreover, the example (FIG. 5) which provided the non-adhesive part in the edge part of the upper layer tape is also mentioned, and it is demonstrated by this that an upper layer tape becomes easy to peel.

  Patent Documents 3 and 4 describe laminated adhesive tapes in which the adhesive strength of the upper tape adhesive layer to the lower tape release agent layer is greater than the adhesive strength of the lower tape adhesive layer to the upper tape release agent layer. .

  The adhesive tape laminates of the type proposed in the above Patent Documents 1 to 4 are certainly preferable in terms of improving the efficiency of the masking operation. However, in reality, this type of adhesive tape laminate has not yet been commercialized until now. This is because such a type of adhesive tape laminate has a unique problem completely different from that of a normal adhesive tape.

  When coating is performed using this type of adhesive tape laminate, for example, (1) adhesive tape laminate is applied, (2) undercoat is applied, (3) upper adhesive tape is peeled off, (4 ) Applying the top coat, (5) Finally, the lower adhesive tape is peeled off. Here, when the upper adhesive tape of (3) is peeled off, the lower adhesive tape must remain without being peeled off from the surface to be adhered. Therefore, in this type of adhesive tape laminate, it has been considered important to keep the adhesive strength of the upper adhesive tape low so that the lower adhesive tape does not peel off together. For example, in patent document 2, it is guessed that the adhesive force is made low by making the thickness of the adhesive layer of an upper adhesive tape thinner than a lower adhesive tape. Moreover, in patent document 3 and 4, it is guessed that the adhesive force is made low by adjusting the mixing | blending of the adhesive layer of an upper adhesive tape.

  However, when this type of adhesive tape laminate is stored and shipped in a state of being wound around a core such as a paper tube, that is, in a usage form in which the user rewinds and attaches it, Problem arises. As mentioned above, since the adhesive strength of the upper adhesive tape is generally lowered in such a type of adhesive tape laminate, the upper adhesive tape peels off from the lower adhesive tape when rewinding from the wound state. Therefore, the so-called “turning” problem (see FIG. 6B described in the embodiment) is likely to occur.

On the other hand, Patent Documents 3 and 4 explain that the magnitude relationship of the adhesive force should be “F ₁ > F ₂ > F ₃ ” so as not to cause the problem of turning up at the time of rewinding as described above. Has been. Here, F ₁ is the adhesive strength of the lower adhesive tape to the object to be adhered, F ₂ is the adhesive strength of the upper adhesive tape to the lower adhesive tape, and F ₃ is the lower adhesive tape of the upper adhesive tape. It is adhesive strength. However, since this type of adhesive tape laminate generally reduces the adhesive strength “F ₂ ” of the upper adhesive tape as described above, the adhesive strength “ “F ₃ ” must also be low. Then, the adhesive strength “F ₁ ” of the lower adhesive tape inevitably becomes a relatively low level. In addition, since “F ₁ ” is an adhesive force to the object to be adhered, when the object to be adhered is a rough surface (eg, uneven surface such as asphalt, concrete, mortar, etc.), “F 1” “ ₁ ” tends to be even lower, and the problem of poor adhesion to the object to be adhered tends to occur.

  As described above, the conventional pressure-sensitive adhesive tape laminate has the conflicting problems of poor adhesion to the object to be adhered and turning over at the time of rewinding, and thus has not yet been commercialized until now.

Japanese Utility Model Publication No. 6-77852 No. 1-18213 Japanese Utility Model Publication No. 63-140046 Japanese Utility Model Publication No. 63-140045

  The objective of this invention is providing the adhesive tape laminated body which is excellent in the adhesiveness with respect to a rough surface, and can be smoothly rewound from the wound state.

  As a result of intensive investigations to achieve the above object, the present inventors have found that it is very effective to set the adhesive strength of the adhesive tape (second adhesive tape) laminated on the upper side within a relatively high specific range. As a result, the present invention was completed.

That is, this invention has the 1st adhesive tape which has an adhesive layer on the single side | surface of a base material, and the 2nd adhesive tape which has an adhesive layer on the single side | surface of a base material, and is on the back surface of a 1st adhesive tape. A pressure-sensitive adhesive tape laminate in which the pressure-sensitive adhesive layer of the second pressure-sensitive adhesive tape is in contact with each other and the parting portion of the second pressure-sensitive adhesive tape is laminated so as to protrude from the parting part of the first pressure-sensitive adhesive tape,
The adhesive force (AD2) of the adhesive layer of the second adhesive tape to the back surface of the first adhesive tape measured according to JIS Z 0237 (2000) is 1.5 to 8 N / 25 mm. It is an adhesive tape laminate.

  In the present invention, since the adhesive force (AD2) of the adhesive layer of the second adhesive tape is set to a relatively high specific range, the degree of freedom in setting the adhesive force of the first adhesive tape is increased, and the first Even if the adhesive strength of the adhesive tape is relatively high, the problem of turning over during rewinding does not occur. And since the adhesive force of both the 1st adhesive tape and the 2nd adhesive tape can be made comparatively high, it is excellent also in the adhesiveness with respect to a rough surface.

It is a fragmentary perspective view which shows one Embodiment of the adhesive tape laminated body of this invention. It is a perspective view which shows the rewinding state of the adhesive tape laminated body of this invention. It is typical sectional drawing for demonstrating the method used for the paint masking use of the road surface of the adhesive tape laminated body of this invention. It is a perspective view which shows the coating process of the adhesive by a roll coat system. It is a perspective view which shows the cutting process by a core cut system. It is typical sectional drawing for demonstrating the evaluation method of generation | occurrence | production of turning in an Example. It is typical sectional drawing for demonstrating the evaluation method of the peelability of the 2nd adhesive tape in an Example.

  FIG. 1 is a partial perspective view showing an embodiment of the pressure-sensitive adhesive tape laminate of the present invention. An adhesive layer 1 b is formed on one side of the substrate 1 a of the first adhesive tape 1, and an adhesive layer 2 b is formed on one side of the substrate 2 a of the second adhesive tape 2. Then, the first adhesive tape 1 is laminated so that the adhesive layer 2b of the second adhesive tape 2 is in contact with the back surface of the first adhesive tape 1. Such a laminated structure eliminates the need to reapply the masking tape when performing multilayer coating.

  The parting part 2 c of the second adhesive tape 2 protrudes from the parting part 1 c of the first adhesive tape 1. The parting parts 1c and 2c are one end part of the width direction of the 1st adhesive tape 1 and the 2nd adhesive tape 2, Comprising: The end for forming the parting line at the time of using for a masking use Part. A portion protruding from the parting part 1c of the first adhesive tape 1 in the width direction of the second adhesive tape 2, that is, a part extending from the parting part 1c to the parting part 2c is referred to as a protruding part C. By having the protruding portion C, it is possible to beautifully finish the coating end face when multilayer coating is performed.

  In addition, the other adhesive tape 2 in the tape width direction (the end opposite to the parting portion 2c) has a non-adhesive portion 2d. By having such a pressure-sensitive adhesive-uncoated portion 2d, the second pressure-sensitive adhesive tape 2 can be easily peeled off from the first pressure-sensitive adhesive tape 1.

  The pressure-sensitive adhesive tape laminate shown in FIG. 1 is a preferred embodiment of the present invention, but the present invention is not limited to this. For example, when it is not necessary to improve the peelability of the second adhesive tape 2 so much, the adhesive-uncoated portion 2d is not necessarily required. Further, if necessary, a three-layer structure in which a third adhesive tape is further laminated on the second adhesive tape 2 may be used, or if necessary, a structure having four or more layers may be used. In addition, a masking sheet may be attached in advance to one end of the first adhesive tape 1 (the end opposite to the parting portion 1c). Furthermore, the first adhesive tape 1 and the second adhesive tape 2 may be colored or transparent. In particular, it is preferable that the first pressure-sensitive adhesive tape 1 is colored and the second pressure-sensitive adhesive tape 2 has transparency so that the parting portion 1c of the first pressure-sensitive adhesive tape 1 can be confirmed.

  FIG. 2 is a perspective view showing a rewind state of the pressure-sensitive adhesive tape laminate of the present invention. This adhesive tape laminate is formed by laminating the first adhesive tape 1 and the second adhesive tape 2, and is wound around the core 3 (paper tube or the like) in the form of a roll in the same manner as an ordinary adhesive tape. It can be stored and shipped in the state where it is stored. As shown in FIG. 2, the laminated body is specifically wound so that the 1st adhesive tape 1 may become inside. The user may rewind and use the laminate.

  FIG. 3 is a schematic cross-sectional view for explaining a method used for painting masking of the road surface of the pressure-sensitive adhesive tape laminate of the present invention. First, the pressure-sensitive adhesive tape laminate of the present invention having the configuration shown in FIG. 3 (A) is bonded onto the rough road surface 4 as shown in FIG. 3 (B). Next, as shown in FIG. 3C, a primer 5 such as an epoxy adhesive is applied, and an aggregate 6 is sprayed thereon for the purpose of imparting slip resistance. Then, as shown in FIG. 3 (D), the adhesive-uncoated portion 2d is carried and the second adhesive tape 2 is peeled off, leaving only the first adhesive tape 1 as shown in FIG. 3 (E). Next, as shown in FIG. 3F, a top coat 7 is applied and formed on the aggregate 6 using a paint. Finally, the first adhesive tape 1 is peeled off as shown in FIG.

  As shown in FIG. 3 (G), the coating end surfaces of the primer 5 and the aggregate 6 are covered with the top coat 7, and the coating end surface X (parting surface) can be finished beautifully. In addition, work efficiency is improved because there is no need to re-apply the masking tape.

  Further, as shown in FIG. 3D, since the second adhesive tape 2 is peeled off by supporting the adhesive-uncoated portion 2d not coated with the adhesive on the end surface opposite to the parting line, there is no adhesive. The second adhesive tape 2 can be easily peeled off as a clue when the applied portion 2d is peeled off.

  In the present invention, the adhesive force (AD2) of the adhesive layer of the second adhesive tape to the back surface of the first adhesive tape is 1.5 to 8 N / 25 mm, preferably 1.9 to 6.55 N / 25 mm. It is. Here, the “rear surface” of the first pressure-sensitive adhesive tape refers to the base material itself of the first pressure-sensitive adhesive tape, or the surface of the base material when the surface of the base material is treated with a release agent or the like, or the base material. Furthermore, when another layer or member is laminated | stacked, the surface of the layer or member is meant. The adhesive force (AD2) is a value measured according to JIS Z 0237 (2000) as described in Examples. Such a pressure-sensitive adhesive layer exhibiting a specific range of adhesive strength (AD2) can be formed by appropriately adjusting various conditions such as the composition and thickness of the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer, the back surface treatment and the back surface material.

  By setting the adhesive force (AD2) to a relatively high specific range as described above, the degree of freedom in setting the adhesive force of the first adhesive tape is expanded. As a result, even if the adhesive strength of the first adhesive tape is set relatively high so that sufficient adhesion to a rough surface such as asphalt, concrete, mortar, etc. is obtained, the adhesive strength of the second adhesive tape is also compared. Therefore, it can be smoothly rewound without causing the problem of turning up when it is rewound from the wound state as shown in FIG. 2 (see FIG. 6B described in the embodiment). And since the adhesive force of both the 1st adhesive tape and the 2nd adhesive tape can be made comparatively high, it is excellent also in the adhesiveness with respect to the rough surface as the whole laminated body. Specifically, in the state shown in FIG. 3B, both the protruding portions C of the first adhesive tape 1 and the second adhesive tape 2 exhibit excellent adhesion to the road surface 4. On the other hand, when the adhesive force (AD2) exceeds 8 N / 25 mm, the first adhesive tape 1 is not peeled off when the second adhesive tape 2 is peeled off as shown in FIG. The pressure-sensitive adhesive force of the pressure-sensitive adhesive layer 1b of the pressure-sensitive adhesive tape 1 needs to be considerably high. As a result, the pressure-sensitive adhesive force of both the protruding portion C of the second pressure-sensitive adhesive tape 2 and the first pressure-sensitive adhesive tape 1 is too high. There is a tendency for so-called “glue residue” that the adhesive remains on the adherend surface.

  In the present invention, the adhesive force (AD1) of the pressure-sensitive adhesive layer of the first pressure-sensitive adhesive tape to the back surface of the second pressure-sensitive adhesive tape may be set as appropriate, but is preferably 1.2 to 7 N / 25 mm, more preferably 1. 4 to 6 N / 25 mm and higher than the adhesive strength (AD2). Here, the “back surface” of the back surface of the second pressure-sensitive adhesive tape means the base material itself of the second pressure-sensitive adhesive tape, or the treated surface when the surface of the base material is treated with a release agent or the like, or the base material. When another layer or member is further laminated thereon, it means the surface of the layer or member. The specific method for measuring the adhesive strength (AD1) is the same as that for the adhesive strength (AD2). Such a pressure-sensitive adhesive layer exhibiting a specific range of adhesive strength (AD1) can be formed by appropriately adjusting various conditions such as the composition and thickness of the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer, the back surface treatment and the back surface material. As described above, since the adhesive strength (AD2) is set in a specific range, even if the adhesive strength (AD1) is set relatively high, the problem of turning over hardly occurs. That is, since the degree of freedom of setting the adhesive strength of the first adhesive tape is expanded, the adhesive strength of the first adhesive tape is appropriately set to the optimum adhesive strength in consideration of the balance between adhesiveness to a rough surface and avoiding turning over. Just do it.

  Hereinafter, each structure of a 1st adhesive tape and a 2nd adhesive tape is demonstrated.

[First adhesive tape]
The first adhesive tape has an adhesive layer on one side of the substrate. Although the kind of adhesive which comprises an adhesive layer is not specifically limited, A rubber-type adhesive is preferable. In general, since the rubber-based pressure-sensitive adhesive is a solid pressure-sensitive adhesive, the pressure-sensitive adhesive layer can be formed relatively thick by a coating method such as a calendar method. If the pressure-sensitive adhesive layer is thickened, the compatibility with the rough surface becomes high, and the problem of poor adhesion is unlikely to occur. In addition, liquid compositions such as paints and base materials before curing penetrate between the pressure-sensitive adhesive layer and the rough surface. Can be prevented. The thickness of the pressure-sensitive adhesive layer of the first pressure-sensitive adhesive tape is preferably 0.02 to 0.40 mm.

  Specific examples of the rubber component of the rubber-based adhesive include natural rubber, styrene butadiene rubber, butyl rubber, synthetic isoprene rubber, butadiene rubber and the like. Two or more rubber components may be used in combination. Of these, natural rubber is preferable.

  The rubber-based pressure-sensitive adhesive preferably contains a tackifier resin. Specific examples of tackifying resins include rosin resins such as rosin and rosin ester, terpene resins, aromatic modified terpene resins, hydrogenated terpene resins, terpene phenol resins and other terpene resins, aliphatic petroleum resins, and aromatics. For example, polymer-based petroleum resins, copolymer-based petroleum resins, alicyclic petroleum resins, coumarone / indene resins, polymer resins such as pure monomer resins, and condensation resins such as phenol resins and xylene resins. Two or more tackifying resins may be used in combination. The compounding amount of the tackifying resin is preferably 20 to 200 parts by mass, more preferably 30 to 150 parts by mass, and particularly preferably 50 to 100 parts by mass with respect to 100 parts by mass of the rubber component.

  Furthermore, it is preferable that the rubber-based adhesive contains a filler (filler) and process oil. Specific examples of the filler include calcium carbonate and zinc oxide. The blending amount of the extender is preferably 30 to 200 parts by mass with respect to 100 parts by mass of the rubber component. The blending amount of the process oil is preferably 5 to 50 parts by mass with respect to 100 parts by mass of the rubber component. Furthermore, an antiaging agent, a vulcanizing agent, a vulcanization accelerator and the like can be added within a range not impairing the object of the present invention.

  However, the adhesive which comprises the adhesive layer of a 1st adhesive tape is not limited to the rubber-type adhesive demonstrated above. Depending on the case, the acrylic adhesive mentioned later may be sufficient, and a urethane adhesive, a silicone adhesive, etc. may be sufficient.

  The type of the base material of the first adhesive tape is not particularly limited, but from the viewpoint of workability, papers such as Japanese paper, crepe paper, and high-quality paper; rayon, cotton, polyester, etc. A laminate of a resin such as polyethylene on one or both sides of a woven or knitted fabric woven from long fibers such as acrylic, polyethylene flat yarn or the like is preferable. When these papers, woven fabrics, or knitted fabrics are used as the base material, the first adhesive tape can be easily cut by hand, so that workability is improved. In particular, when a woven fabric or a knitted fabric is used as a base material, the first adhesive tape can be cut straight in the lateral direction (along the weft), and has a flexibility that can cope with unevenness on the rough surface, and is further adhesive. The adhesive of the agent layer is more preferable because it appropriately permeates the base material. From such a point, for example, a base material obtained by laminating a resin such as polyethylene on a woven cloth such as sufu can be suitably used. The thickness of the base material of the first adhesive tape is preferably 0.05 to 0.3 mm.

  However, the base material of the first adhesive tape is not limited to the papers, woven fabrics, or knitted fabrics described above. Depending on the case, a polypropylene film, a polyethylene film, etc. may be sufficient, for example. Moreover, you may apply | coat a mold release agent to the surface on the opposite side to the surface in which the adhesive layer of a base material is formed.

[Second adhesive tape]
The second pressure-sensitive adhesive tape has a pressure-sensitive adhesive layer on one side of the substrate. Although the kind of adhesive which comprises an adhesive layer is not specifically limited, Acrylic adhesive is preferable from a peelable point. The thickness of the pressure-sensitive adhesive layer of the second pressure-sensitive adhesive tape is preferably 0.01 to 0.10 mm.

  As the acrylic polymer that is the base polymer of the acrylic pressure-sensitive adhesive, a polymer mainly composed of alkyl (meth) acrylate is generally used. Here, “(meth) acrylate” means acrylate or methacrylate. In particular, a copolymer of an alkyl (meth) acrylate and another radical polymerizable monomer is preferable. Specific examples of the alkyl (meth) acrylate include ethyl (meth) acrylate, n-butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, isooctyl (meth) acrylate, n-octyl (meth) acrylate, isononyl (meth) And alkyl (meth) acrylates having an alkyl group having 2 to 12 carbon atoms, such as acrylate and lauryl (meth) acrylate. Two or more alkyl (meth) acrylates may be used in combination. Examples of copolymerizable monomer components with the acrylate include carboxyl group-containing monomers such as (meth) acrylic acid, maleic acid, fumaric acid, and itaconic acid, and anhydrides thereof, (meth) acrylonitrile, N-vinylpyrrolidone, and N-vinyl. Nitrogen-containing monomers such as caprolactam, acryloylmorpholine, (meth) acrylamide, dimethylaminoethyl (meth) acrylate, diethylaminoethyl (meth) acrylate, dimethylaminopropylacrylamide, N-vinylacetamide, 2-hydroxyethyl (meth) acrylate, 2 -Hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, hydroxyl group-containing monomers such as caprolactone-modified (meth) acrylate, and the like. Two or more copolymerizable monomer components may be used in combination.

  The acrylic polymer is preferably crosslinked with a crosslinking agent. Specific examples of the crosslinking agent include an isocyanate crosslinking agent, an epoxy crosslinking agent, a chelate crosslinking agent, an aziridine crosslinking agent, and a melamine crosslinking agent. The blending amount of the crosslinking agent is preferably 0.01 to 5.0 parts by mass with respect to 100 parts by mass of the base polymer.

  However, the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer of the second pressure-sensitive adhesive tape is not limited to the acrylic pressure-sensitive adhesive described above. Depending on the case, it may be the same as the rubber-based pressure-sensitive adhesive suitably used for the first pressure-sensitive adhesive tape described above, or may be a urethane-based pressure-sensitive adhesive, a silicone-based pressure-sensitive adhesive, or the like. good.

  The type of the base material of the second adhesive tape is not particularly limited, but from the viewpoint of workability, the same materials as those of papers, woven fabrics or knitted fabrics preferably used for the first adhesive tape described above are used. preferable. However, in the case of the base material of the second adhesive tape, a base material in which polyethylene or the like is laminated on both sides of a spun yarn of polyester or other resin or a woven or knitted fabric made of a flat yarn of resin such as polyethylene or the like Can be suitably used. The thickness of the second pressure-sensitive adhesive tape substrate is preferably 50 to 150 mm.

  However, the base material of the second adhesive tape is not limited to paper, woven fabric, or knitted fabric. Depending on the case, a polypropylene film, a polyethylene film, etc. may be sufficient, for example. Moreover, you may apply | coat a mold release agent to the surface on the opposite side to the surface in which the adhesive layer of a base material is formed.

  There is no particular limitation on the method in which one end in the width direction of the second pressure-sensitive adhesive tape is used as a non-adhesive-applied portion. For example, the adhesive is applied by stripe coating of the pressure-sensitive adhesive or bonding of films to the pressure-sensitive adhesive surface There are various methods such as killing. However, it is particularly preferable to reuse the ear end waste material generated in the pressure-sensitive adhesive coating process for manufacturing another pressure-sensitive adhesive tape as the second pressure-sensitive adhesive tape. Hereinafter, the ear end waste material will be described.

FIG. 4 is a perspective view showing a pressure-sensitive adhesive coating process using a roll coating method. In this method, the adhesive layer B is continuously formed on the substrate A by passing the substrate A between the back roll 8 and the coating roll 9. The adhesive b to be applied is supplied from the upper nozzle 10. What is necessary is just to adjust the width | variety of the adhesive layer B in the position of the liquid drawing member 11 of both ends.

  As shown in FIG. 4, the pressure-sensitive adhesive layer B is formed over almost the entire width of the base material A, but the pressure-sensitive adhesive non-applied portion d remains at the ear ends (both ends in the width direction) of the base material A. . If the adhesive is to be applied to the entire surface up to the position of the edge of the base material A, the adhesive b protrudes from the end of the base material A when the base material A meanders and shifts to the left and right. It goes around to the back side. Then, it becomes difficult for the base material A to be peeled off from the guide roll or the like in a subsequent process (such as a drying process or a winding process), and the adhesive tape may be stretched or cut due to unexpectedly high tension. In order to avoid such a trouble, it is necessary to make the ear | edge edge part of the base material A the adhesive-uncoated part d. In FIG. 4, the roll coating method is shown and described. However, in other methods such as die coating, calendar coating, reverse coating, gravure coating, knife coating, etc. d remains. Such a portion of the non-adhesive-applied portion d is usually discarded as ear end waste.

  In FIG. 4, the substrate A has a width (for example, 1000 mm to 1500 mm) that is much wider than the width (for example, 25 mm or 50 mm) of the adhesive tape as the final product. This is because it is more cost-effective to form the pressure-sensitive adhesive layer B on the wide substrate A and finally cut it to obtain the final product.

  FIG. 5 is a perspective view showing a cutting process by the core cutting method. The intermediate product obtained in the coating process shown in FIG. 4 is wound up to form a log roll 12 as shown in FIG. Then, as shown in FIG. 5B, the log roll 12 is connected to the shaft 13 and rotated, and is cut by the rotating cutting blade 14. Thereby, many adhesive tape products 15 as shown in FIG. 5C are obtained. On the other hand, the portion where the adhesive non-applied portion d, which is the end of the log roll 12, is the ear end waste 16.

  By reusing the ear edge waste 16 as described above as the second pressure-sensitive adhesive tape of the present invention, a troublesome process for forming the non-adhesive-applied portion d is not required, reducing manufacturing costs and effectively utilizing resources. This is also preferable from the viewpoint of environmental policy of reducing industrial waste.

  Hereinafter, the present invention will be described by way of examples. However, the present invention is not limited to these examples. In the following description, “part” means “part by mass”.

<Examples 1-3, Comparative Examples 1-2>
(Base material)
The following sufu woven fabric base materials SF150 to SF210 and polyethylene woven fabric base materials PE115 to PE125 were prepared.

“SF150”: Polyethylene is laminated on one side (surface opposite to the surface on which the adhesive layer is formed) of a sufu woven fabric (40 warp yarns, 30 weft yarns), and then a long-chain alkyl release A base material made of sufu woven fabric having a thickness of 0.15 mm to which an agent is applied.
"SF180": Polyethylene is laminated on one side (surface opposite to the surface on which the adhesive layer is formed) of a sufu woven fabric (30 warp yarns, 25 weft yarns), and then a long-chain alkyl release A base material made of sufu woven fabric having a thickness of 0.18 mm to which an agent is applied.
“SF210”: Polyethylene is laminated on one side (surface opposite to the surface on which the adhesive layer is formed) of a sufu woven fabric (45 warp yarns, 35 weft yarns), and then a long-chain alkyl release A base material made of sufu woven fabric having a thickness of 0.21 mm to which an agent is applied.
“PE115”: Polyethylene is laminated on both sides of a polyethylene woven fabric, and a long-chain alkyl release agent is formed on the surface of one polyethylene laminate layer (the polyethylene laminate layer opposite to the polyethylene laminate layer on which the adhesive layer is formed). A base material made of polyethylene woven fabric having a thickness of 0.115 mm, coated with
“PE125”: The same base material made of polyethylene woven fabric as “PE115” except that the thickness is 0.125 mm.

(Adhesive)
The following rubber adhesives NR1 to NR3 and acrylic adhesives AC1 to AC3 were prepared.

“NR1”: a rubber-based pressure-sensitive adhesive containing 100 parts of natural rubber, 150 parts of calcium carbonate, 100 parts of a tackifier resin (trade name Quinton R100, manufactured by Nippon Zeon Co., Ltd.), and 30 parts of process oil.
“NR2”: A rubber-based pressure-sensitive adhesive containing 100 parts of natural rubber, 140 parts of calcium carbonate, 70 parts of tackifying resin, and 30 parts of process oil.
“NR3”: A rubber-based adhesive containing 65 parts natural rubber, 35 parts recycled rubber, 140 parts calcium carbonate, 100 parts tackifying resin, and 30 parts process oil.
“AC1”: 97 parts of 2-ethylhexyl acrylate and 3 parts of acrylic acid were polymerized in a solvent using 2,2′-azobis (isobutyronitrile) as an initiator to obtain an acrylic polymer having a solid content of 50%. An acrylic pressure-sensitive adhesive containing 100 parts of this acrylic polymer as a base polymer and 1 part of an isocyanate curing agent (trade name L-45, manufactured by Soken Chemical Co., Ltd.).
“AC2”: 20 parts of butyl acrylate, 77 parts of 2-ethylhexyl acrylate and 3 parts of acrylic acid were polymerized in a solvent using 2,2′-azobis (isobutyronitrile) as an initiator, and an acrylic system having a solid content of 50% A polymer was obtained. A pressure-sensitive adhesive containing 100 parts of this acrylic polymer as a base polymer and 1 part of an isocyanate curing agent (trade name L-45, manufactured by Soken Chemical Co., Ltd.).
"AC3": 20 parts of butyl acrylate, 79 parts of 2-ethylhexyl acrylate and 1 part of acrylic acid were polymerized in a solvent using 2,2'-azobis (isobutyronitrile) as an initiator, and an acrylic system having a solid content of 50% A polymer was obtained. A pressure-sensitive adhesive containing 100 parts of this acrylic polymer as a base polymer and 1 part of an isocyanate curing agent (trade name L-45, manufactured by Soken Chemical Co., Ltd.).

(Production of first and second adhesive tapes)
With the combinations shown in Table 1, a pressure-sensitive adhesive layer was formed on one side of the substrate to obtain first and second pressure-sensitive adhesive tapes. Specifically, when using a rubber-based pressure-sensitive adhesive, a rubber-based pressure-sensitive adhesive is applied on one side of the substrate with a calender roll to form a rubber-based pressure-sensitive adhesive layer, and when using an acrylic pressure-sensitive adhesive, the base material An acrylic pressure-sensitive adhesive was applied to one side of the film with a roll coater and dried to form an acrylic pressure-sensitive adhesive layer.

(Measurement of adhesive layer thickness)
According to JIS Z 0237 (2000), the thickness of the base material before forming the pressure-sensitive adhesive layer and the thickness of the pressure-sensitive adhesive tape after forming the pressure-sensitive adhesive layer are measured, and the thickness of the base material is determined from the thickness of the pressure-sensitive adhesive tape. By subtracting the thickness, the thickness of the adhesive layer of each adhesive tape was calculated. The results are shown in Table 1.

(Preparation of adhesive tape laminate)
In the combinations shown in Table 1, the second adhesive tape was laminated so that the adhesive layer of the second adhesive tape was in contact with the back surface of the first adhesive tape, and the adhesives of Examples 1-3 and Comparative Examples 1-2. A tape laminate was obtained.

(Measurement of adhesive strength)
In accordance with JIS Z 0237 (2000), the peel adhesive strength test for the back surface of the tape was carried out under the conditions of a peel angle of 180 °, a curing time after pressure bonding of 20 minutes, and a peel speed of 300 mm / min. Adhesive force (AD1) of the pressure-sensitive adhesive layer of the first pressure-sensitive adhesive tape to (the release agent-treated surface of the base material of the second pressure-sensitive adhesive tape) and the back surface of the first pressure-sensitive adhesive tape (base material of the first pressure-sensitive adhesive tape) The pressure-sensitive adhesive force (AD2) of the pressure-sensitive adhesive layer of the second pressure-sensitive adhesive tape with respect to the release agent-treated surface of (2) was measured. The results are shown in Table 1.

<Evaluation method>
The adhesive tape laminates of Examples 1 to 3, Reference Example 1, and Comparative Examples 1 to 2 were evaluated by the following methods. The results are shown in Table 2.

(Occurrence of turning)
As shown in FIG. 6, the end of the pressure-sensitive adhesive tape laminate (1 and 2) wound in the form of a roll is pulled in the 90 ° direction, and the length of 1000 mm is wound at a speed of about 500 mm / min. Returned. At that time, as shown in FIG. 6 (A), the second adhesive tape can be rewound without any problem or the first adhesive tape 1 to be rewound as shown in FIG. 6 (B) is underneath. It was observed whether or not the problem of “turning up” that the lower second adhesive tape 2 floated by pulling the back surface of No. 2 was evaluated and evaluated according to the following criteria.
“◯”: No turning occurred, and the film could be smoothly rewound in the state shown in FIG.
“Δ”: Turn-up occurred, but the occurrence frequency was low and the condition was mild.
“X”: Severe turning was always generated as shown in FIG.

(Adhesiveness to the rough surface of the protruding part C)
Assuming a rough surface such as a road, a test plate (polishing surface on the upper side) in which # 280 water-resistant abrasive paper was fixed to a SUS plate was prepared. Using this test plate as an adherend, the adhesion of the second adhesive tape to the test plate under the conditions of a peel angle of 90 °, a curing time of 24 hours after pressure bonding, and a peel rate of 500 mm / min in accordance with JIS Z 0237 (2000) The force was measured. By this test, the adhesiveness with respect to the rough surface of the protrusion part C of a 2nd adhesive tape can be evaluated. Specifically, evaluation was performed according to the following criteria.
“◯”: Adhesive strength was 5 N / 25 mm or more, and no adhesive residue was generated on the test plate.
“Δ”: Adhesive strength was 2 N / 25 mm or more and less than 5 N / 25 mm, and no adhesive residue was generated on the test plate.
“X”: Adhesive strength was less than 2 N / 25 mm and adhesion was poor, or adhesive strength was high but adhesive residue was generated.

(Peelability of the second adhesive tape)
The same test piece used in the above “adhesiveness to the rough surface of the protruding portion C” was prepared. Then, as shown in FIG. 7, the pressure-sensitive adhesive tape laminate is adhered to the test plate 17, and only the protruding portion C of the second pressure-sensitive adhesive tape 2 is gripped by the chuck 18, and the peeling angle 90 is determined according to JIS Z 0237 (2000). The second pressure-sensitive adhesive tape 2 was peeled from the back surface of the first pressure-sensitive adhesive tape 1 under the conditions of a curing time of 24 hours after pressure bonding and a peeling speed of 500 mm / min. At that time, the second adhesive tape 2 has been normally peeled off from the back surface of the first adhesive tape 1 as shown in FIG. 7 (A), or the first adhesive tape as shown in FIG. 7 (B). It was observed whether 1 was also peeled off together and evaluated according to the following criteria.
“◯”: Always peeled off normally in the state shown in FIG.
“Δ”: The first adhesive tape 1 was peeled off at a frequency of about 20 to 30% as shown in FIG.
“X”: The first adhesive tape 1 was peeled off at a frequency of almost 100% as shown in FIG. 7B.

(Adhesiveness to the rough surface of the first adhesive tape)
The same test as the above “adhesiveness to the rough surface of the protruding portion C” was performed on the first pressure-sensitive adhesive tape, and was evaluated according to the same criteria.

<Evaluation results>
As shown in Table 1, in Examples 1 to 3, no turning occurred, and the film could be smoothly rewound as shown in FIG. Moreover, both the protruding portion C of the second pressure-sensitive adhesive tape and the first pressure-sensitive adhesive tape had good adhesion to the rough surface, and no adhesive residue was generated. Furthermore, the 2nd adhesive tape was able to peel normally from the back surface of the 1st adhesive tape, as shown to FIG. 7 (A).

  In Comparative Example 1, since the adhesive force (AD2) of the second adhesive tape with respect to the back surface of the first adhesive tape is too low, the first adhesive is used in order to avoid the occurrence of turning as shown in FIG. This is an example in which the adhesive strength of the tape is adjusted to be low by adjusting the composition and thickness of the tape. As a result, no curling occurred, but the adhesiveness to the rough surface of the first pressure-sensitive adhesive tape was inferior, and when the second pressure-sensitive adhesive tape was peeled off from the back surface of the first pressure-sensitive adhesive tape, FIG. As shown, the first adhesive tape 1 was also peeled off. Furthermore, the protrusion C of the second adhesive tape was also inferior in adhesion to the rough surface.

  In Comparative Example 2, since the adhesive force (AD2) of the second adhesive tape with respect to the back surface of the first adhesive tape is too high, the peeling failure of the second adhesive tape as shown in FIG. 7B is avoided. In addition, the composition and thickness of the pressure-sensitive adhesive of the first pressure-sensitive adhesive tape are adjusted to increase the overall adhesive strength. As a result, there was no peeling failure of the second adhesive tape, but the turning as shown in FIG. 6B occurred, and both the protruding portion C of the second adhesive tape and the first adhesive tape were both adhesive. Since the force was too high, glue residue occurred.

<Examples 4 to 6>
A pressure-sensitive adhesive tape laminate was produced in the same manner as in Examples 1 to 3, except that the ear end waste material generated in the pressure-sensitive adhesive coating process for the production of another pressure-sensitive adhesive tape was used as the second pressure-sensitive adhesive tape. . These pressure-sensitive adhesive tape laminates were not turned up as in Examples 1 to 3, good adhesion to the rough surface, and no adhesive residue was generated. In addition, since the pressure-sensitive adhesive non-applied portion 2d as shown in FIGS. 1 and 3 is provided, the second pressure-sensitive adhesive tape 2 is easily peeled off.

  The pressure-sensitive adhesive tape laminate of the present invention is useful, for example, in a masking application when a rough surface such as a road or an outer wall of a building is subjected to multilayer coating. In particular, it is very suitable for forming a parting line when painting such as various road markings such as a pedestrian crossing and a center line and a division line display in a parking lot.

DESCRIPTION OF SYMBOLS 1 1st adhesive tape 1a Base material 1b Adhesive layer 1c Parting part 2 2nd adhesive tape 2a Base material 2b Adhesive layer 2c Parting part C Overhang part 2d Adhesive non-application part 3 Core 4 Road surface 5 Primer 6 Bone Material 7 Topcoat A Base material B Adhesive layer b Adhesive d Adhesive-uncoated part 8 Back roll 9 Coating roll 10 Nozzle 11 Liquid dipping member 12 Log roll 13 Shaft 14 Cutting blade 15 Adhesive tape product 16 Ear end waste 17 Test plate 18 chuck

Claims (6)

It has the 1st adhesive tape which has an adhesive layer on one side of a substrate, and the 2nd adhesive tape which has an adhesive layer on the one side of a substrate, and the 2nd adhesive tape on the back of the 1st adhesive tape The pressure-sensitive adhesive layer is in contact with each other and the part of the second pressure-sensitive adhesive tape is laminated such that the parting part of the second pressure-sensitive adhesive tape protrudes from the parting part of the first pressure-sensitive adhesive tape,
The adhesive force (AD2) of the adhesive layer of the second adhesive tape to the back surface of the first adhesive tape measured according to JIS Z 0237 (2000) is 1.5 to 8 N / 25 mm. Adhesive tape laminate.   The adhesive strength (AD1) of the adhesive layer of the first adhesive tape to the back surface of the second adhesive tape measured according to JIS Z 0237 (2000) is 1.4 to 7 N / 25 mm, and the adhesive strength The pressure-sensitive adhesive tape laminate according to claim 1, which is lower than (AD2).   The pressure-sensitive adhesive tape laminate according to claim 1 or 2, wherein the second pressure-sensitive adhesive tape has a non-adhesive portion at one end in the tape width direction.   The pressure-sensitive adhesive tape laminate according to claim 3, wherein the second pressure-sensitive adhesive tape is an ear end waste material produced in a pressure-sensitive adhesive coating process for producing another pressure-sensitive adhesive tape.   The pressure-sensitive adhesive tape laminate according to any one of claims 1 to 4, wherein the pressure-sensitive adhesive layer of the first pressure-sensitive adhesive tape comprises a rubber-based pressure-sensitive adhesive.   The pressure-sensitive adhesive tape laminate according to any one of claims 1 to 5, which is a pressure-sensitive adhesive tape laminate for coating a rough surface.

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