JP2004067857A - Double-sided adhesive tape - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a double-sided adhesive tape seldom leaving part or the whole thereof on an adherend and/or the adhesive surface after separating the adherend off the adhesive surface even if used for mutually sticking the longer adherend and the adhesive surface. <P>SOLUTION: The double-sided adhesive tape is such one that a 1st adhesive layer 3a, a 1st stretch resin layer 2a, a 2nd adhesive layer 3b, a core material layer 1, a 3rd adhesive layer 3c, a 2nd stretch resin layer 2b and a 4th adhesive layer 3d are laminated in this order, wherein the core material layer 1 is divisible so as to enable separation of a 1st stretch part comprising the 1st adhesive layer 3a, the 1st stretch resin layer 2a and the a 2nd adhesive layer 3b and a 2nd stretch part comprising the 2nd stretch resin layer 2b and the 4th adhesive layer 3d. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a case where a wiring mall or a floor molding is bonded to a wall or a floor; a case where an ashtray, a compass, a mobile phone holder, an aromatic deodorant, etc. are bonded to a dashboard of a car; The present invention relates to a double-sided pressure-sensitive adhesive tape used for bonding and the like.
[0002]
[Prior art]
Conventionally, as a double-sided pressure-sensitive adhesive tape, a tape in which a pressure-sensitive adhesive layer is provided on both sides of a base material layer made of a resin is widely used. This double-sided pressure-sensitive adhesive tape is used after the adherend and the adherend surface are attached to each other, and when the adherend is separated from the adherend surface, the adhesive or the base material layer adheres to the adherend or the adherend surface. They remain as they are, and it is difficult to remove them.
[0003]
Also known is a double-sided pressure-sensitive adhesive tape in which a pressure-sensitive adhesive layer is formed on both sides of a base layer made of paper. With this adhesive tape, when the used adherend is separated from the adherend surface, the base material layer is divided into two parts in the thickness direction, and the adhesive and a part of the base material layer remain on the adherend and the adherend surface. And it is difficult to remove them.
[0004]
For this reason, adherends such as resin molded products bonded to a wall or the like using these double-sided adhesive tapes are difficult to recycle after use.
[0005]
Further, as a double-sided adhesive tape in which the adhesive does not remain on the adherend or the adherend after the adherend is separated from the adherend, adhesive layers are formed on both sides of a stretch layer made of a resin that extends very well. Things are also known. This double-sided pressure-sensitive adhesive tape is used with one end extending from the bonding surface, and when separating the adherend from the bonding surface, hold one end of the double-sided pressure-sensitive adhesive tape extended from the bonding surface. Pull. Thereby, the double-sided adhesive tape is pulled out from the bonding surface, and the adherend can be separated from the adherend surface. This is because when the stretch resin layer is stretched by pulling by hand, the pressure-sensitive adhesive layer follows the elongation and the pressure-sensitive adhesive layer becomes thinner, resulting in a weaker adhesive force. It comes off.
[0006]
However, the double-sided pressure-sensitive adhesive tape having the stretch resin layer can be formed only to a length of at most about several cm. This is because if the tape is formed too long, the entire tape cannot be pulled out from between the bonding surfaces of the adherend even if the tape is pulled with one end, and the tape is cut in the middle. Therefore, this double-sided pressure-sensitive adhesive tape is difficult to use when bonding a long adherend to a wall surface or the like.
[0007]
Adherends, such as long resin molded products, are used especially for business use, and when recycling after use is required, if a part of the adhesive tape adheres to the resin molded product, etc., it will be recycled. hard. For this reason, there is a strong demand for a double-sided pressure-sensitive adhesive tape in which all or a portion of the tape hardly remains on the adherend or the adherend surface after use even when used for such a long adherend.
[0008]
[Problems to be solved by the invention]
The present invention is also used for laminating a long adherend and an adherend surface, or after separating the adherend from the adherend surface, all or all of the adhesive tape on the adherend or adherend surface. A main object is to provide a double-sided pressure-sensitive adhesive tape in which a part is hardly left.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the present inventor has conducted repeated studies and found the following findings. A double-sided pressure-sensitive adhesive tape having a pressure-sensitive adhesive layer, a stretch resin layer and a pressure-sensitive adhesive layer provided in this order on both sides of a core material layer made of a material that can be divided in the thickness direction, is used to attach a long adherend and an adherend surface. After use in the combined state, two parts including the pressure-sensitive adhesive layer, the stretch resin layer and the pressure-sensitive adhesive layer can be separated from each other by applying a force by hand or the like in the thickness direction, for example. Thereby, the adherend can be easily separated from the adherend surface. As a material of such a core material layer, foamed resin, paper or nonwoven fabric can be adopted.
[0010]
An adhesive layer, a stretch resin layer, an adhesive layer, and a divided core material layer adhere to the adherend and the adherend surface separated in this manner, and are pulled in the tape length direction. Thereby, the stretch resin layer is stretched, and the pressure-sensitive adhesive layer is thinned accordingly, and furthermore, the stretch resin layer is partially exposed, so that the pressure-sensitive adhesive tape adhered to the adherend can be easily peeled off. Further, the adhesive hardly remains on the adherend and the adherend surface after the adhesive tape is peeled off.
[0011]
Based on the above findings, the present invention provides the following double-sided pressure-sensitive adhesive tapes.
[0012]
Item 1. A first pressure-sensitive adhesive layer, a first stretch resin layer, a second pressure-sensitive adhesive layer, a core material layer, a third pressure-sensitive adhesive layer, a second stretch resin layer, and a fourth pressure-sensitive adhesive layer laminated in this order; Has a first stretch portion comprising a first adhesive layer, a first stretch resin layer and a second adhesive layer, and a second stretch portion comprising a third adhesive layer, a second stretch resin layer and a fourth adhesive layer. Double-sided adhesive tape which can be divided so as to be separable.
[0013]
Item 2.両 面 The double-sided pressure-sensitive adhesive tape according to item 1, wherein the core material layer is made of a foamed resin.
[0014]
Item 3.両 面 The double-sided pressure-sensitive adhesive tape according to item 1, wherein the core material layer is made of paper.
[0015]
Item 4.両 面 The double-sided pressure-sensitive adhesive tape according to item 1, wherein the core material layer is made of a nonwoven fabric.
[0016]
Item 5.引 張 The tensile strength of the first stretch resin layer and / or the second stretch resin layer is 30 to 50 N / mm²Item 6. The double-sided pressure-sensitive adhesive tape according to any one of Items 1 to 4, wherein
[0017]
Item 6. Item 6. The double-sided pressure-sensitive adhesive tape according to any one of Items 1 to 5, wherein the first stretch resin layer and / or the second stretch resin layer has an elongation at break of 300 to 1200%.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described in detail.
Basic configuration
The double-sided pressure-sensitive adhesive tape of the present invention comprises a first pressure-sensitive adhesive layer, a first stretch resin layer, a second pressure-sensitive adhesive layer, a core material layer, a third pressure-sensitive adhesive layer, a second stretch resin layer, and a fourth pressure-sensitive adhesive layer in this order. A first stretch portion and a third adhesive layer, a second stretch resin layer, and a fourth adhesive layer, wherein the core material layer is laminated and includes a first adhesive layer, a first stretch resin layer, and a second adhesive layer. And a second stretch portion made of the same.
Core layer
The core material layer only needs to be capable of separating the first stretch portion and the second stretch portion so as to be separable. Furthermore, the core material layer is capable of separating the first stretch portion and the second stretch portion so that the first stretch portion and the second stretch portion can be separated by applying a force, for example, by hand or the like in a thickness direction, a surface direction, or a middle direction of the tape. I just need. The state of division depends on the material of the core layer. When the core material layer is divided into two or three or more layers in the thickness direction (A) as shown in FIGS. Examples include the case of breaking (B) and the case of not being layered but being irregularly divided into two or three or more portions in the thickness direction (C).
[0019]
Examples of the material of the core layer include foamed resin, paper, and nonwoven fabric. Among them, a foamed resin is preferable.
<Foam resin>
As the resin, a resin known per se can be used. Examples of such known resins include polyethylene, polyurethane, polyvinyl alcohol, EPDM, polyvinyl chloride, poly (meth) acrylic acid, and poly (meth) acrylate. Among them, polyethylene, polyurethane, polyvinyl alcohol and EPDM are preferred, and polyethylene and polyurethane are most preferred.
i) polyethylene
As the polyethylene, any of high-density polyethylene, medium-density polyethylene, and low-density polyethylene can be used. In addition, any of a straight-chain or substantially straight-chain structure and a structure having many branches can be used. In particular, those having a medium density or lower are preferable, and those having a low density are more preferable. A density of about 0.9 to 0.96, particularly about 0.9 to 0.93 is preferable.
ii) Polyurethane
The polyurethane is not particularly limited, and any known polyurethane can be used without limitation.
[0020]
The polyisocyanate constituting the polyurethane is not particularly limited, and a polyisocyanate known as a raw material of the polyurethane can be selected from a wide range and used.
[0021]
Examples of such polyisocyanates include 4,4'-diphenylmethane diisocyanate (MDI), water-added MDI, 4,4'-biphenyl diisocyanate tolidine diisocyanate, isophorone diisocyanate, 1,3-xylylene diisocyanate, and 1,4-xylene diisocyanate. , P-tetramethylxylene diisocyanate, m-tetramethylxylene diisocyanate, 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, 1,5-naphthalene diisocyanate, m-phenylene diisocyanate, p-phenylene diisocyanate, triphenyl Methane triisocyanate, 4,4'-dicyclohexylmethane diisocyanate, 1,4-tetramethylene diisocyanate, 1,6-hexamethylene Isocyanate, 1,8-octamethylene diisocyanate, L-lysine diisocyanate, 1,6,11-undecane triisocyanate, 4,4 ′, 4 ″ -triphenylmethane triisocyanate, 2,4,4′-biphenyl triisocyanate And 2,4,4'-diphenylmethane triisocyanate.
[0022]
These can be used alone or in combination of two or more.
[0023]
As the polyol, a known polyol as a raw material for polyurethane can be selected from a wide range and used. Examples of such a polyol include polyether diol and polyester diol.
[0024]
Examples of the polyether diol include ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol, trimethylene glycol, tetramethylene glycol (1,3- or 1,4-butylene glycol), tetramethylene ether glycol, neopentyl glycol, One or two or more of polymers or copolymers such as 6-hexamethylene glycol and bisphenol A, or one or more of these low molecular weight glycols, such as ethylene oxide, propylene oxide, butylene oxide, tetrahydrofuran, and styrene oxide Examples obtained by adding the above can be exemplified.
[0025]
Polyester diols include ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol, trimethylene glycol, tetramethylene glycol (1,3- or 1,4-butylene glycol), tetramethylene ether glycol, neopentyl glycol, 1,6 One or two of hexamethylene glycol, decamethylene glycol, bisphenol A, bisphenol F, p-xylylene glycol, 1,4-cyclohexanediol, 1,4-cyclohexanedimethanol, or an alkylene oxide adduct thereof; And above, malonic acid, maleic acid, succinic acid, adipic acid, glutaric acid, pimelic acid, sebacic acid, oxalic acid, phthalic acid, isophthalic acid, terephthalic acid, hexahydrophthalate A polyester diol obtained by reacting one or more kinds of acids or the like; a polyester diol obtained by ring-opening polymerization of a cyclic ester such as propiolactone, butyrolactone, or caprolactone; And polyester diols obtained by reacting the glycol, dibasic acid and cyclic ester. These can be used alone or in combination of two or more.
[0026]
Polyurethane can be produced according to a conventional method by arbitrarily combining these polyisocyanates and polyols.
[0027]
The expansion ratio varies depending on the type of resin and the thickness of the core material layer, but can be, for example, about 5 to 50 times, preferably about 30 to 40 times. If the expansion ratio is too low, the core layer is difficult to be divided when separating between adherends after use. On the other hand, if the expansion ratio is too high, the adherend and the adherend surface are stuck to each other and the adherend is easily peeled off from the adherend surface during use. Such a problem does not occur within the scope of the present invention.
[0028]
Specific examples of foamed polyethylene include, for example, Minafoam manufactured by Sakai Chemical Co., Ltd., and specific examples of foamed polyurethane include, for example, Super Seal manufactured by Nippon Sharma Co., Ltd.
[0029]
To the resin used as the core material layer, known additives such as antioxidants, plasticizers, fillers, antistatic agents, antifungal agents, coloring agents, flame retardants, and foaming agents are added as additives for resin molded products. can do.
<Paper>
The paper may be any paper as long as it can be divided in the thickness direction, and any paper made of natural material or resin can be used. In the case of resin-made paper, examples of the resin include polyethylene, polyurethane, polyvinyl alcohol, EPDM, polyvinyl chloride, poly (meth) acrylic acid, poly (meth) acrylate, polypropylene, nylon, and polyester. Can be Polyethylene and polyurethane are as described for the foamed resin.
<Non-woven fabric>
As the nonwoven fabric, both long-fiber nonwoven fabric and short-fiber nonwoven fabric can be used. The nonwoven fabric material is not particularly limited, and a resin known per se can be used. Such known resins include polyethylene, polyurethane, polypropylene, nylon, polyester and the like. Polyethylene and polyurethane are as described for the foamed resin. Particularly, polypropylene is preferable.
[0030]
As a specific example of the nonwoven fabric, for example, ELTAS manufactured by Asahi Kasei Co., Ltd. manufactured by a spun bond method may be mentioned.
<Thickness of core material layer>
The thickness of the core layer depends on the type of the resin and the type of the core layer, but can be generally about 0.1 to 15 mm, preferably about 0.5 to 2 mm. If the base material layer is too thin, it is difficult to divide the base material into two parts. Conversely, if the base material layer is too thick, the adherend is likely to peel off due to the division of the core material layer during use with the adherend adhered to the surface to be adhered. Such a problem does not occur within the scope of the present invention.
Stretch resin layer
The stretch resin layer may be any as long as it stretches so that the pressure-sensitive adhesive layer becomes thin enough to separate from the adherend and the adherend surface following the stretch.
As the resin, a resin known as a stretch layer material can be used. Examples of such known resins include polyethylene, polypropylene, polybutadiene, polyvinyl chloride, nylon, vinylon, ethylene-vinyl acetate copolymer, acrylic resin, polystyrene, polyurethane, and polyvinyl alcohol. These materials can be used alone or in combination of two or more. The stretch resin layer may be a layer obtained by laminating two or more films made of different materials. Particularly, polyethylene, polypropylene, nylon, vinylon, and ethylene-vinyl acetate copolymer are preferable, and polyethylene (particularly, linear low-density polyethylene) is most preferable.
[0031]
The stretch resin layer may or may not be foamed. In the case of a foamed resin, the expansion ratio can be, for example, about 5 to 50 times, preferably about 5 to 15 times. If the expansion ratio is too low, the stretchability is good, that is, the tensile strength is high, and it is difficult to stretch by hand. Such a problem does not occur within the scope of the present invention.
[0032]
In the stretch resin layer, known additives such as an antioxidant, a plasticizer, a filler, an antistatic agent, a fungicide, a coloring agent, a flame retardant, a surfactant, and a slip agent are added as additives of the resin molded product. Can be added.
[0033]
Specific examples of the material of the stretch resin layer include polyethylene films such as Tamapoly UB manufactured by Takiron Co., polypropylene films such as Bayren manufactured by Toyobo Co., butadiene foam such as Calsoft manufactured by Takiron Co., Sekisui Chemical Co., Ltd. and Toray Industries, Ltd. Examples include a co-extruded multilayer film of polyethylene and an ethylene-vinyl acetate copolymer by Synthetic Film Co., Ltd.
[0034]
The stretch resin layer has a tensile strength of, for example, 10 to 100 N / mm.²Degree, preferably 30-50 N / mm²Of the order. If the tensile strength is too low, the stretch resin layer is easily cut, and if it is too high, the tension for securing the stretchability increases, and the peeling feeling when pulled by hand increases. Such a problem does not occur within the scope of the present invention.
[0035]
The stretch resin layer may have an elongation at break of, for example, about 300 to 1200%, preferably about 600 to 1000%. If the elongation at break is too low, the pressure-sensitive adhesive layer will not be sufficiently thin with the elongation of the stretch resin layer, and the pressure-sensitive adhesive layer will not be discontinuous. Is likely to remain. On the other hand, if the elongation at break is too high, the adhesive tape adhered to the adherend after being separated is peeled off too much, making it difficult to peel off. Such a problem does not occur within the scope of the present invention.
[0036]
In the present invention, the tensile strength and elongation at break are values measured according to JIS Z-0237.
[0037]
For example, in the case of a layer made of polyethylene, the tensile strength and elongation at break can be set to the above ranges by appropriately setting conditions such as resin temperature, stretching distance, and cooling temperature during film processing. In general, when the resin temperature during film processing increases, the tensile strength in the film running direction decreases, and the elongation at break increases. In general, as the stretching distance increases, the tensile strength decreases, and the elongation at break increases. In general, when the cooling temperature is high, the tensile strength decreases and the elongation at break slightly increases.
[0038]
The thickness of the stretch resin layer can be, for example, about 25 to 100 μm, and preferably about 40 to 60 μm. If the thickness is too small, the stretched resin layer is easily cut when peeling off the tape adhered from the adherend after separation, and it is necessary to pull again and again, which is troublesome. On the other hand, if the thickness is too large, a strong force is required to stretch the stretch resin layer as necessary for peeling, and the feeling of peeling is deteriorated. Such a problem does not occur within the scope of the present invention.
[0039]
In addition, the stretch resin layer is a layer on which one or both surfaces are subjected to an anchor treatment such as a primer treatment, an electron beam irradiation treatment, and a corona discharge treatment in order to improve the adhesion with the pressure-sensitive adhesive layer. Can be. The conditions of the electron beam irradiation treatment or corona discharge treatment include, for example, conditions of about 10 to 13 A and about 13 m / min, whereby a stretch resin layer having a surface roughness of 30 to 40 dynes is obtained. The thickness of the primer layer can be, for example, about 0.1 to 5 μm, and preferably about 0.1 to 0.5 μm.
[0040]
In the double-sided pressure-sensitive adhesive tape of the present invention, the first stretch resin layer and the second stretch resin layer may be the same or different from each other in terms of material, tensile strength, elongation at break or thickness. . For example, when there is a remarkable difference in the material and surface condition between the adherends to be bonded (for example, the adherend such as a molded product and the adherend surface), the adherence with the adhesive layer is good. When the stretch resin layer disposed on the adherend side is thicker than the stretch resin layer disposed on the adherend having poor adhesion to the adhesive, the feeling of peeling is better than when a stretch resin layer having the same thickness is used.
Adhesive layer
The pressure-sensitive adhesive layer can be a layer made of a material known as a pressure-sensitive adhesive used for a pressure-sensitive adhesive tape. Examples of such known adhesive bases include acrylic adhesives, rubber adhesives, urethane adhesives, silicone adhesives, vinyl acetate adhesives, and ethyl acetate / water emulsion adhesives. No. Among them, an acrylic pressure-sensitive adhesive is preferable.
[0041]
Specific examples of the base of such an adhesive include an acrylic adhesive such as Sibinol manufactured by Seiden Chemical Co., a rubber-based adhesive such as Bond G manufactured by Konishi, and a urethane such as Vinsole manufactured by Oyster Oil and Fat. And the like.
[0042]
In addition, a tackifier resin may be blended in the base of the pressure-sensitive adhesive. In some cases, a commercially available adhesive base itself contains a tackifier resin. As the tackifier resin, those known per se can be used without limitation. Examples of such known tackifier resins include rosin ester resins, hydrocarbon resins, terpene resins, and pure monomer resins. Glycerin and fatty acids can also be exemplified as tackifiers.
[0043]
Specific examples of the tackifier resin include, for example, rosin ester resins such as Arakawa Chemical's ester gum, hydrocarbon resins such as Nippon Zeon's Quitton, terpene resins such as Yasuhara Yushi's YS resin, A pure monomer resin such as Crystallex manufactured by Hercules Inc. may be used.
[0044]
The amount of the tackifier resin used can be, for example, about 5 to 50% by weight, preferably about 5 to 20% by weight, based on the pressure-sensitive adhesive base. If the amount of the tackifier resin is too small, the adhesiveness and tackiness become insufficient, and if it is too large, the adhesiveness and tackiness become insufficient. Such a problem does not occur within the scope of the present invention.
[0045]
In the pressure-sensitive adhesive layer, a plasticizer and a filler are used. Known additives can be used as additives for pressure-sensitive adhesives such as antioxidants, crosslinking agents, coloring agents, and catalysts.
[0046]
The thickness of the pressure-sensitive adhesive layer varies depending on the material of the pressure-sensitive adhesive layer, the unevenness of the surface of the stretch resin layer, the presence or absence of an anchor layer, and the like, but can be, for example, about 10 to 100 μm, and preferably about 30 to 60 μm. If the pressure-sensitive adhesive layer is too thick, the adhesion to the stretch resin layer is reduced, and the pressure-sensitive adhesive is likely to remain on the adherend or the adherend surface, or the stretch resin layer is prevented from elongating. Further, if the pressure-sensitive adhesive layer is too thin, the adhesiveness to the adhered surface is deteriorated, and it becomes difficult to divide the core material layer. Such a problem does not occur within the scope of the present invention.
[0047]
In the double-sided pressure-sensitive adhesive tape of the present invention, the first, second, third, and fourth pressure-sensitive adhesive layers may be the same or different in terms of material, thickness, properties, and the like.
Ratio of thickness of each layer
The ratio of the thickness of each layer described above is such that the ratio of the core material layer: the stretch resin layer: the pressure-sensitive adhesive layer is usually about 1: 0.01: 0.01 to 1: 0.25: 0.25, particularly 1: 0. The ratio is preferably about 05: 0.05 to 1: 0.15: 0.15.
Various characteristics
The ball tack measured by the method described in the examples of the double-sided pressure-sensitive adhesive tape of the present invention was No. No. 2 to about 20; It is preferably about 5 to 10. The adhesive strength measured by the method described in the examples is preferably about 2 to 20 N / 20 mm, particularly preferably about 5 to 10 N / 20 mm. The holding force measured by the method described in the examples is preferably about 0 to 2 mm, particularly preferably about 0 to 1 mm. Further, the shear retention force measured by the method described in the examples is preferably about 0 to 2 mm, particularly preferably about 0 to 1 mm. The ball tack measured by the method described in the examples is preferably about 2 to 20, particularly about 5 to 10. Tensile strength measured by the method described in Examples is 10 to 100 N / mm.²Degree, especially 30-50N / mm²It is preferred that it is about. The elongation measured by the method described in the examples is preferably about 300 to 1200%, particularly preferably about 600 to 1000%. The split strength A measured by the method described in the examples is preferably about 1 to 10 N / 20 mm, particularly preferably about 2 to 5 N / 20 mm, and the split strength B measured by the method described in the examples is 1 to 20 N / 20 N / 20 mm. / 20 mm, particularly preferably about 5 to 15 N / 20 mm.
Production method
The double-sided pressure-sensitive adhesive tape of the present invention can be produced, for example, by the following method.
[0048]
As a first step, the pressure-sensitive adhesive composition containing the pressure-sensitive adhesive raw material is applied to release paper using an applicator or the like, and the pressure-sensitive adhesive composition is continuously applied at about 80 to 105 ° C. from the portion where the pressure-sensitive adhesive composition is applied. By drying for about 5 to 2 minutes, a fourth pressure-sensitive adhesive layer is formed on the release paper.
[0049]
Next, the surface on which the fourth pressure-sensitive adhesive layer is formed and the sheet to be the second stretch resin layer are pressed together by, for example, a pressure roller, so that the fourth pressure-sensitive adhesive layer and the second stretch resin layer are formed on the release paper. The tape piece 1 formed in this order is wound up.
[0050]
In the second step, a third pressure-sensitive adhesive layer is formed on release paper in the same manner as described above. Next, the tape piece 1 is paid out, and the third pressure-sensitive adhesive layer and the surface of the tape piece 1 on which the second stretch resin layer is formed are continuously pressed together.
[0051]
Further, the release paper is peeled off to expose the third pressure-sensitive adhesive layer, and the sheet to be the core material layer is continuously and continuously pressed from the exposed third pressure-sensitive adhesive layer portion. The thus obtained tape piece 2 having a fourth pressure-sensitive adhesive layer, a second stretch resin layer, a third pressure-sensitive adhesive layer and a core material layer formed in this order on a release paper is wound up.
[0052]
As a third step, a second pressure-sensitive adhesive layer is formed on release paper. Next, the second pressure-sensitive adhesive layer and the surface of the tape piece 3 on which the core material layer is formed are continuously pressed together.
[0053]
Further, the release paper is peeled off to expose the second pressure-sensitive adhesive layer, and the sheet to be the first stretch resin layer is continuously pressed from the exposed second pressure-sensitive adhesive layer portion together. The tape piece 3 obtained by forming a fourth adhesive layer, a second stretch resin layer, a third adhesive layer, a core material layer, a second adhesive layer, and a first stretch resin layer on the release paper in this order. Take up.
[0054]
In the fourth step, the first pressure-sensitive adhesive layer is formed on the release paper as described above. Next, the first pressure-sensitive adhesive layer and the surface of the tape piece 3 on which the first stretch resin layer is formed are continuously pressed together. Further, the release paper placed on the first pressure-sensitive adhesive layer is peeled off and wound on a winding bobbin.
[0055]
In this way, the fourth adhesive layer, the second stretch resin layer, the third adhesive layer, the core material layer, the second adhesive layer, the first stretch resin layer, and the first adhesive layer are formed on the release paper. The double-sided pressure-sensitive adhesive tape of the present invention laminated in order is obtained.
[0056]
【Example】
Hereinafter, the present invention will be described in more detail with reference to examples and test examples, but the present invention is not limited to these examples.
Example 1
A double-sided pressure-sensitive adhesive tape was manufactured by the following four steps.
<First step>
100 parts by weight of Sybinol manufactured by Saiden Chemical Co., Ltd., which is an acrylic adhesive, 3 parts by weight of Coronate L55E (manufactured by Nippon Polyurethane Industry Co., Ltd.) as a cross-linking agent, and 3 parts by weight of ethyl acetate as a diluting solvent are blended. The mixture was stirred for minutes to obtain a pressure-sensitive adhesive composition. This was applied to release paper using an applicator such that the thickness of the dried adhesive layer was 50 μm. The fourth pressure-sensitive adhesive layer 3d was formed on the release paper by continuously drying at 100 ° C. for 2 minutes from the portion where the pressure-sensitive adhesive composition was applied.
[0057]
Next, the surface of the release paper on which the fourth pressure-sensitive adhesive layer 3d is formed, on which the pressure-sensitive adhesive layer 3d is formed, and a 50 μm thick Tamapoly UV (linear low-density polyethylene) having a thickness of 50 μm as the second stretch resin layer 2b. And pressed continuously with a pair of pressing rollers. Thereby, the tape piece 1 in which the fourth adhesive layer 3d and the second stretch resin layer 2b were formed in this order on the release paper was obtained. A continuously formed tape piece 1 was wound around a bobbin.
<Second step>
The above-mentioned pressure-sensitive adhesive composition was applied to a release paper using an applicator so that the thickness after drying was 50 μm. The third pressure-sensitive adhesive layer 3c was formed on the release paper by continuously drying at 100 ° C. for 2 minutes from the portion where the pressure-sensitive adhesive composition was applied.
[0058]
Next, the tape piece 1 is fed out, and the surface of the release paper on which the third adhesive layer 3c is formed is aligned with the surface of the tape piece 1 on which the second stretch resin layer 2b is formed. , And were continuously pressed by a pair of pressure rollers.
[0059]
Further, the release paper is peeled to expose the third pressure-sensitive adhesive layer 3c, and the core material layer is made of 0.5 mm thick Minafoam manufactured by Sakai Chemical Co., Ltd. continuously from the exposed third pressure-sensitive adhesive layer 3c. The sheets were combined and continuously pressed by a pair of pressing rollers. As a result, a tape piece 2 having the fourth pressure-sensitive adhesive layer 3d, the second stretch resin layer 2b, the third pressure-sensitive adhesive layer 3c, and the core material layer 1 formed on the release paper in this order was obtained. A continuously formed tape piece 2 was wound around a bobbin.
<Third step>
The above-mentioned pressure-sensitive adhesive composition was applied to a release paper using an applicator so that the thickness after drying was 50 μm. The second pressure-sensitive adhesive layer 3b was formed on the release paper by continuously drying at 100 ° C. for 2 minutes from the portion where the pressure-sensitive adhesive composition was applied.
[0060]
Next, the tape piece 2 is paid out, and the surface of the release paper on which the second adhesive layer 3b is formed, on which the adhesive layer 3b is formed, and the surface of the tape piece 2, on which the core material layer 1 is formed, are joined to form a pair. Were continuously pressed by the pressure roller.
[0061]
Further, the release paper is peeled off to expose the second pressure-sensitive adhesive layer 3b, and from the exposed second pressure-sensitive adhesive layer 3b portion, a 50 μm-thick Tamapoly UV (straight-chain) as a first stretch resin layer is manufactured. (Low-density polyethylene) were continuously pressed together by a pair of pressing rollers.
[0062]
Thereby, the fourth adhesive layer 3d, the second stretch resin layer 2b, the third adhesive layer 3c, the core material layer 1, the second adhesive layer 3b, and the first stretch resin layer 2a are formed in this order on the release paper. A tape piece 3 was obtained. The tape piece 3 was wound on a bobbin.<Fourth step>
The above-mentioned pressure-sensitive adhesive composition was applied to a release paper using an applicator so that the thickness after drying was 50 μm. The first pressure-sensitive adhesive layer 3a was formed on release paper by continuously drying at 100 ° C. for 2 minutes from the portion where the pressure-sensitive adhesive composition was applied.
[0063]
Next, the tape piece 3 is fed out, and the surface of the release paper on which the first adhesive layer 3a is formed and the surface of the tape piece 3 on which the first stretch resin layer 2a is formed are aligned with each other. , And were continuously pressed by a pair of pressing rollers. The release paper disposed on the first pressure-sensitive adhesive layer 3a was peeled off from the pressed portion, and wound on a winding bobbin.
[0064]
Thus, a double-sided pressure-sensitive adhesive tape having a cross section shown in FIG. 2 was obtained. This tape includes a fourth adhesive layer 3d, a second stretch resin layer 2b, a third adhesive layer 3c, a core material layer 1, a second adhesive layer 3b, a first stretch resin layer 2a, and a first adhesive layer 3a. Are stacked in this order. The tape thickness is 0.8 mm. Further, the fourth pressure-sensitive adhesive layer 3d is disposed on a release paper.
<Ball tack>
The ball tack of the double-sided pressure-sensitive adhesive tape obtained in Example 1 as measured by the method of JIS # 0237 is as follows. It was 8.
<Adhesive strength>
The pressure-sensitive adhesive strength of the double-sided pressure-sensitive adhesive tape obtained in Example 1 measured by JIS # 0237 was 10 N / 20 mm.
< Holding force>
The holding power of the double-sided pressure-sensitive adhesive tape obtained in Example 1 measured by the method of JIS # 0237 was 0 mm.
<Shear retention force>
A 25 mm × 25 mm test piece of the double-sided pressure-sensitive adhesive tape obtained in Example 1 was produced. As shown in FIG. 3, both ends of a pair of stainless steel plates (JIS-Z-0237) are bonded using this test piece, and a pair of stainless steel plates bonded with the test piece is rolled with a load of 2 kg. The space was passed one round trip.
[0065]
Next, as shown in FIG. 3, one end of one stainless steel plate was supported, and the other stainless steel plate was allowed to stand with a weight of 1 kg applied vertically. Was 0 mm.
<Tensile strength and elongation>
When the tensile strength and elongation of the double-sided pressure-sensitive adhesive tape obtained in Example 1 were measured in accordance with JIS Z-0237, the tensile strength at break was 40 N / mm.²And the elongation was 900%.
<Split strength>
For the double-sided pressure-sensitive adhesive tape obtained in Example 1, a test piece having a width of 20 mm and a length of 100 mm was prepared. One side of this test piece was bonded and fixed to a plate made of methacrylic acid resin. A force is applied at a speed of 300 mm / min in a direction of 90 degrees to the tape surface on the stretch layer portion of the test piece thus fixed, which is not fixed to the methacrylic acid resin, at a speed of 300 mm / min. Was divided in the thickness direction, and the magnitude of the force was measured. At this time, the division strength A was 2.5 N / 20 mm.
[0066]
The same test piece was sandwiched between methacrylic acid resin plates, and the methacrylic acid resin plate was bonded with the test pieces by making one reciprocation pass between rolls loaded with a load of 2 kg. Next, a force is applied to one of the methacrylic acid resin plates at a speed of 300 mm / min in a direction at 90 degrees to the tape surface (tape thickness direction), and the magnitude of the force when the core material layer is divided Was measured. At this time, the division strength B was 13 N / 20 mm. In addition, the core material layer was divided into two substantially at the center in the thickness direction by applying a force of 13 N / 20 mm or more.
<Observation of the state after splitting the core layer>
i) The part consisting of the adhesive layer, the stretch resin layer, the adhesive layer, and the divided core layer remaining on the methacrylic acid resin plate after the measurement of the split strength A is pulled by hand while being stretched in the length direction by hand. As a result, the pressure-sensitive adhesive layer was peeled off from the plate without remaining on the plate.
ii) {In addition, after the measurement of the division strength B, the portion of the adhesive layer, the stretch resin layer, the adhesive layer, and the divided core layer remaining on both methacrylic acid resin plates is also extended in the length direction by hand. By pulling, the adhesive layer was peeled off from the plate without leaving an adhesive layer on the plate.
iii) Test pieces having a width of 3 cm and a length of 100 cm were prepared for the double-sided pressure-sensitive adhesive tape obtained in Example 1. Using a vinyl chloride molding (5 cm wide × 100 cm long) and a vinyl chloride floor using this test piece, they were strongly press-bonded.
[0067]
One week later, the end of the mall was vertically pulled up by hand to separate the mall from the floor. The part consisting of the adhesive layer, stretch resin layer, adhesive layer and divided core layer remaining on the mall and floor surface is also stretched by hand while stretching in the length direction, whereby the adhesive layer is formed on the board. Peeled off the plate without remaining.
[0068]
【The invention's effect】
According to the present invention, even when used for laminating a long adherend and an adherend surface, all of the adhesive tape is adhered to the adherend or the adherend surface after separating the adherend from the adherend surface. Alternatively, a double-sided pressure-sensitive adhesive tape that is hardly partially left is provided.
[0069]
Furthermore, in the double-sided pressure-sensitive adhesive tape of the present invention, the core material layer has a first stretch portion formed of a first pressure-sensitive adhesive layer, a first stretch resin layer and a second pressure-sensitive adhesive layer, a third pressure-sensitive adhesive layer, and a second stretch layer. Since the second stretch portion composed of the resin layer and the fourth pressure-sensitive adhesive layer is divided so as to be separable, even if it is used for laminating a long adherend to the adherend surface, after use, By applying force to the adherend by hand or the like, the core material layer is divided, and the adherend can be separated from the adherend surface.
[0070]
In addition, on the separated adherend and the adherend surface, the first pressure-sensitive adhesive layer, the first stretch resin layer, the second pressure-sensitive adhesive layer, and the divided core material layer, or the third pressure-sensitive adhesive layer, The stretch resin layer, the fourth pressure-sensitive adhesive layer, and the divided core material layer adhere to each other, but by pulling them in the length direction, the stretch resin layer expands, and the pressure-sensitive adhesive layer follows the expansion. Since the film becomes thinner, and furthermore, the stretch resin layer is partially exposed, the adhesive strength is weakened, and these can be easily peeled off from the adherend and the adherend surface. In addition, the adhesive and other parts of the tape of the present invention hardly remain on the adherend and the adherend surface. Thus, the used adherend can be recycled.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating a divided state of a core material layer.
FIG. 2 is a cross-sectional view of a double-sided pressure-sensitive adhesive tape according to one embodiment of the present invention.
FIG. 3 is a diagram illustrating a method for measuring the shear holding force of the double-sided pressure-sensitive adhesive tape of the present invention.
[Explanation of symbols]
1 core material layer
2a First stretch resin layer
2b @ second stretch resin layer
3a @ First pressure-sensitive adhesive layer
3b @ second pressure-sensitive adhesive layer
3c @ 3rd adhesive layer
3d @ 4th adhesive layer

Claims (4)

A first pressure-sensitive adhesive layer, a first stretch resin layer, a second pressure-sensitive adhesive layer, a core material layer, a third pressure-sensitive adhesive layer, a second stretch resin layer, and a fourth pressure-sensitive adhesive layer laminated in this order; Has a first stretch portion composed of a first adhesive layer, a first stretch resin layer and a second adhesive layer, and a second stretch portion composed of a third adhesive layer, a second stretch resin layer and a fourth adhesive layer. Double-sided adhesive tape which can be separated so as to be separable. The double-sided pressure-sensitive adhesive tape according to claim 1, wherein the core material layer is made of a foamed resin. The double-sided pressure-sensitive adhesive tape according to claim 1, wherein the core material layer is made of paper. The double-sided pressure-sensitive adhesive tape according to claim 1, wherein the core material layer is made of a nonwoven fabric.

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