JP6996859B2 - Adhesive tape roll - Google Patents

Description

The present invention relates to an adhesive tape roll that is lightly expandable and has little change in the adhesive strength of the adhesive tape regardless of the feeding position.

Adhesive tapes are used in various industrial fields because they can be easily joined. In the construction field, temporary fixing of curing sheets, bonding of interior materials, etc., in the automobile field, fixing of interior parts such as seats and sensors, fixing of exterior parts such as side moldings and side visors, module assembly in the electrical and electronic field, etc. Adhesive tape is used to attach the module to the housing. Further, as a surface protective tape for protecting the surface of a member such as an optical device, a metal plate, a painted metal plate, a resin plate, or a glass plate, a base material layer and an adhesive layer laminated on one surface thereof are also used. Adhesive tapes having the above are used (for example, Patent Documents 1 to 3).

The adhesive tape is usually manufactured by a coextrusion method or the like, and then shipped in the form of a roll-shaped adhesive tape roll, which is appropriately unwound from the adhesive tape roll and cut into an appropriate shape. FIG. 1 shows a schematic diagram illustrating the feeding of the adhesive tape from the adhesive tape roll.
In FIG. 1, the adhesive tape 2 is composed of a base material layer 21 and an adhesive layer 22. The adhesive tape roll 1 is formed by winding the adhesive tape 2. The adhesive tape 2 is unwound from the adhesive tape roll 1 and is used.

While the adhesive tape can exhibit the adhesive force required for each application, it is preferable that the force (deployment force) required for unwinding from the adhesive tape roll is smaller (so-called "light expandability").
However, there is a problem that the adhesive strength of the adhesive tape unwound from the adhesive tape roll may be significantly different even though the adhesive tape is the same. That is, the adhesive tape unwound from the vicinity of the outside of the adhesive tape roll exhibits high adhesive strength, whereas the adhesive tape unwound from the vicinity of the winding core has low adhesive strength, which is large from the viewpoint of quality stability. It was a problem.

Japanese Unexamined Patent Publication No. 1-129085 Japanese Unexamined Patent Publication No. 6-1958 Japanese Unexamined Patent Publication No. 8-12952

In view of the above situation, it is an object of the present invention to provide an adhesive tape roll which is lightly expandable and has little change in the adhesive force of the adhesive tape regardless of the feeding position.

The present invention is an adhesive tape roll in which an adhesive tape having a base material layer and an adhesive layer is wound in a roll shape, and the base material layer contains a polyolefin resin and a mold release agent (a). The pressure-sensitive adhesive layer is a pressure-sensitive adhesive tape roll containing the release agent (b).
The present invention will be described in detail below.

The present inventors investigated the cause of a large difference in the adhesive strength of the adhesive tape unwound from the adhesive tape roll. As a result, it was found that the cause was the bias of transfer of the release agent contained in the base material layer.
In the adhesive tape roll, a mold release agent is blended in the base material layer in order to ensure light expandability. For example, when a polyolefin resin is used as the base material layer and a mold release agent is added thereto, the mold release agent bleeds out from the base material layer and a very thin mold release layer is formed on the surface of the base material layer. In the adhesive tape roll, the release layer formed on the surface of the base material layer comes into contact with the adhesive surface of the wound adhesive layer. As a result, the light deployability of the adhesive tape roll can be ensured.
In such a lightly deployable adhesive tape roll, the release layer formed on the surface of the base material layer comes into contact with the adhesive surface of the wound adhesive layer, so that a part of the release layer is an adhesive. May be transferred to the surface of the layer. Although the adhesive strength of the adhesive tape is reduced by the transfer of the release layer, it has been considered that there is no practical problem if an adhesive layer having an adhesive strength of a certain level or higher is selected. However, the present inventors have found that the degree of transfer of such a release layer varies greatly depending on the feeding position. The adhesive tape wound around the adhesive tape roll is subjected to a stress called "winding". This stress is not constant in the adhesive tape roll, and is strong near the core and weak near the outside. Therefore, in the vicinity of the winding core, the release layer is strongly pressed by the adhesive surface of the pressure-sensitive adhesive layer and the degree of transfer is larger, whereas in the vicinity of the outer winding, the stress pressed is weaker and the degree of transfer is higher. It gets smaller. As a result, the adhesive tape unwound from the vicinity of the winding core shows high adhesive strength because the release layer is not transferred to the surface of the adhesive layer so much, whereas the adhesive tape unwound from the vicinity of the winding core is adhesive. It was considered that a large amount of the release layer was transferred to the surface of the agent layer and the adhesive strength was lowered.
As a result of further diligent studies, the present inventors have not only blended the mold release agent in the base material layer, but also blended the mold release agent in the pressure-sensitive adhesive layer, so that it is lightly expandable and has a feeding position. The present invention has been completed by finding that it is possible to provide an adhesive tape roll having a small change in adhesive strength regardless of the above.

The adhesive tape roll of the present invention is a roll of an adhesive tape having a base material layer and an adhesive layer.
The base material layer contains a polyolefin resin and a mold release agent (a). In such a base material layer, the release agent bleeds out and a very thin mold release layer is formed on the surface of the base material layer, so that a lightly deployable adhesive tape roll can be obtained.

The polyolefin-based resin is not particularly limited, and conventionally known polyolefin-based resins can be used, and examples thereof include polypropylene (PP) resin and polyethylene (PE) resin.
Examples of the polypropylene resin include homopolypropylene, random polypropylene, block polypropylene and the like.
Examples of the polyethylene resin include high-pressure low-density polyethylene, linear low-density polyethylene, and high-density polyethylene. Of these, polypropylene resin is preferable from the viewpoint of transparency, rigidity and heat resistance, and homopolypropylene or a copolymer of propylene and at least one α-olefin is more preferable.

The release agent (a) is not particularly limited as long as it is generally used for the base material layer of the adhesive tape, and for example, an amine-based release agent, a silicon-based release agent, a fluorine-based release agent, and a hydrocarbon are used. Examples thereof include a release agent, a metal soap release agent, and the like. These release agents may be used alone or in combination of two or more. Among them, an amine-based mold release agent, a silicon-based mold release agent, a fluorine-based mold release agent or a metal soap-based mold release agent is preferable, an amine-based mold release agent is more preferable, and among the amine-based mold release agents, a saturated fatty acid bisamide is preferable. Is more preferable.

Examples of the saturated fatty acid bisamide include saturated fatty acid aliphatic bisamides such as ethylene bisstearic acid amide, methylene bisstearic acid amide, and hexamethylene bisstearic acid amide, and m-xylylene bisstearic acid amide, N-N'-. Examples thereof include saturated fatty acid aromatic bisamides such as distearyl isophthalic acid amide. Among the saturated fatty acid aliphatic bisamides, ethylene bisstearic acid amides are preferable. Among the saturated fatty acid aromatic bisamides, m-xylylene bisstearic acid amide is preferable. These saturated fatty acid bisamides may be used alone or in combination of two or more.

Examples of the silicone-based mold release agent include silicone oil, a silane coupling agent, and a silicone polymer. Of these, a polymer obtained by graft-polymerizing a reactive polyorganosiloxane on a polyolefin resin is preferable.
Examples of the fluorine-based mold release agent include (meth) acrylic acid esters having a perfluoroalkyl group having 1 to 18 carbon atoms. The perfluoroalkyl group having 1 to 18 carbon atoms is more preferably 1 to 6 carbon atoms. The perfluoroalkyl group having 1 to 18 carbon atoms may be linear or branched. These may be used alone or in combination of two or more.
Examples of the hydrocarbon-based mold release agent include synthetic waxes and natural waxes. Of these, PE wax and PP wax are preferable.
Examples of the metal soap release agent include metal salts of long-chain fatty acids or organic acids (salts of metals other than alkali metals).

The content of the release agent (a) in the base material layer is not particularly limited, but the preferable lower limit is 0.5 parts by weight and the preferable upper limit is 4 parts by weight with respect to 100 parts by weight of the polyolefin resin. When the content of the release agent (a) is within this range, the thickness of the release layer formed by bleeding out from the base material layer is about 1 to 100 nm, and the light expandability of the adhesive tape roll is ensured. However, it is possible to prevent a decrease in the adhesive strength of the pressure-sensitive adhesive layer due to excessive transfer. The more preferable lower limit of the content of the release agent (a) is 1 part by weight, and the more preferable upper limit is 3 parts by weight.

The base material layer may contain additives such as antistatic agents, antioxidants, weather resistant agents and crystal nucleating agents, and resin modifiers such as polyolefins, polyesters, polyamides and elastomers, as long as the effects of the present invention are not impaired. It may be contained.

The thickness of the base material layer is not particularly limited, but the preferred lower limit is 20 μm and the preferred upper limit is 200 μm. When the thickness of the base material layer is within this range, the handleability is excellent. The more preferable lower limit of the thickness of the base material layer is 25 μm, and the more preferable upper limit is 180 μm.

The base resin constituting the pressure-sensitive adhesive layer is not particularly limited, and examples thereof include styrene-based elastomers, acrylic-based elastomers, urethane-based elastomers, and olephen-based elastomers. Of these, styrene-based elastomers are preferable because they can exhibit high adhesive strength (initial adhesive strength) and the hardness can be easily adjusted depending on the styrene content.

The styrene-based elastomer is not particularly limited, and for example, styrene ethylene propylene styrene block copolymer (SEPS), hydrogenated styrene butadiene rubber (HSBR), styrene ethylene butylene styrene block copolymer (SEBS), styrene ethylene propylene block. Polymer (SEP), Styrene Ethylene Butylene Block Polymer (SEB), Styrene-Isoprene Block Polymer (SI), Styrene-Isoprene-Styrene Block Polymer (SIS), Styrene-butadiene Block Polymer (SI) SB), styrene-butadiene-styrene block copolymer (SBS) and the like can be mentioned.

Among the above-mentioned styrene-based elastomers, styrene ethylene propylene styrene block copolymer (SEPS), hydrogenated styrene butadiene rubber (HSBR), and styrene ethylene butylene because it is easy to adjust the viscosity to an appropriate level in the primary structure design of the polymer. Styrene block copolymers (SEBS) are particularly suitable.

The pressure-sensitive adhesive layer contains a mold release agent (b). This makes it possible to provide an adhesive tape roll having a small change in adhesive strength regardless of the feeding position.
The reason for this is not necessarily clear, but it is considered that the irregular transfer of the release layer from the base material layer side can be prevented by adding the release agent to the pressure-sensitive adhesive layer as well.

As the release agent (b) contained in the pressure-sensitive adhesive layer, the same release agent (a) as contained in the base material layer can be used.
The release agent (a) contained in the base material layer and the release agent (b) contained in the pressure-sensitive adhesive layer may be the same type or different types.

The content of the release agent (b) in the pressure-sensitive adhesive layer is not particularly limited, but the preferable lower limit is 0.5 parts by weight and the preferable upper limit is 4 parts by weight with respect to 100 parts by weight of the base resin. When the content of the release agent (b) is within this range, it is possible to reduce the change in the adhesive force depending on the feeding position while ensuring an appropriate adhesive force. The more preferable lower limit of the content of the release agent (b) is 1 part by weight, and the more preferable upper limit is 3 parts by weight.

The content of the release agent (b) in the pressure-sensitive adhesive layer and the content of the release agent (a) in the base material layer may be in the range of 1/3 to 3 by weight. preferable. When the ratio of the two is within this range, it is possible to more reliably achieve both an appropriate adhesive force and a reduction in the change in the adhesive force depending on the feeding position.

The pressure-sensitive adhesive layer may contain, for example, an additive such as a tackifier, an antioxidant, a softener, and an anti-adhesive agent, if necessary, for the purpose of controlling the adhesive strength.
The content of the tackifier in the pressure-sensitive adhesive layer is not particularly limited, but is preferably 40 parts by weight or less with respect to 100 parts by weight of the base resin constituting the pressure-sensitive adhesive layer.

The thickness of the pressure-sensitive adhesive layer is not particularly limited, but the preferred lower limit is 2 μm and the preferred upper limit is 30 μm. When the thickness of the pressure-sensitive adhesive layer is within this range, sufficient adhesive strength to the adherend and handleability can be achieved at the same time. The more preferable lower limit of the thickness of the pressure-sensitive adhesive layer is 2.5 μm, and the more preferable upper limit is 20 μm.

The adhesive tape roll of the present invention is a roll of the adhesive tape.
The adhesive tape roll of the present invention may be one in which only the adhesive tape is wound without using the core material, or may be one in which the adhesive tape is wound around the core material.

The winding length of the adhesive tape roll of the present invention is not particularly limited, but the effect of the present invention is particularly exhibited when the winding length is 300 m or more. It is considered that this is because the longer the winding length, the larger the stress difference due to "winding" between the vicinity of the winding core and the vicinity of the winding outside. The winding length is more preferably 500 m or more.

The pressure-sensitive adhesive tape roll of the present invention has a concentration change rate of 30 between the concentration of the release agent on the outermost surface of the pressure-sensitive adhesive layer of the winding core side sample and the concentration of the release agent on the outermost surface of the pressure-sensitive adhesive layer of the winding outer sample. % Or less is preferable.
The sample on the winding core side means a sample cut out at a position up to 10 m from the end on the winding core side, and the sample on the outside of the winding means a sample cut out at a position up to 10 m from the end on the outside of the winding. do. The concentration change rate is calculated by the following formula.
Concentration change rate = | Concentration of mold release agent on the outermost surface of the pressure-sensitive adhesive layer of the winding core side sample-Concentration of release agent on the outermost surface of the pressure-sensitive adhesive layer of the outer winding sample | Mold concentration x 100

The method for producing the adhesive tape roll of the present invention is not particularly limited, and a conventionally known method can be used.
As a method for producing the above-mentioned adhesive tape, for example, a method of laminating another layer on a layer previously obtained by T-die molding or inflation molding by a known laminating method such as extrusion lamination or extrusion coating. A method of laminating the obtained films by dry lamination after forming the layers independently as a film can be mentioned. From the viewpoint of productivity, each material of the base material layer and the pressure-sensitive adhesive layer is extruded into multiple layers. Coextrusion molding, which is supplied to a machine for molding, is preferable, and T-die molding is more preferable from the viewpoint of thickness accuracy.
The adhesive tape roll of the present invention can be obtained by winding the adhesive tape thus produced into a roll shape.

According to the present invention, it is possible to provide an adhesive tape roll that is lightly expandable and has little change in the adhesive force of the adhesive tape regardless of the feeding position.

It is a schematic diagram explaining the feeding out of an adhesive tape from an adhesive tape roll.

Hereinafter, embodiments of the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples.

<Base resin of adhesive layer>
As the base resin of the pressure-sensitive adhesive layer, the ones synthesized in the following Synthesis Examples 1 and 2 and the commercially available product 1 were used. Table 1 shows synthetic examples and commercially available base resins.

(1) Synthesis example 1
In a nitrogen-substituted reaction vessel, 500 parts by weight of degassed and dehydrated cyclohexane, 15 parts by weight of styrene and 5 parts by weight of tetrahydrofuran were charged, and 0.13 parts by weight of n-butyllithium was added at the polymerization initiation temperature of 40 ° C. Then, the temperature-heating polymerization was carried out to obtain an aromatic alkenyl polymer block (block A).
After the polymerization conversion of the aromatic alkenyl polymer block reaches approximately 100%, the reaction solution is cooled to 15 ° C., then 20 parts by weight of styrene as an aromatic alkenyl compound and 1,3-butadiene 65 as a conjugated diene compound. A part by weight was added, and further heating-temperature polymerization was carried out to obtain a conjugated diene polymer block (block B).
After the polymerization conversion reached almost 100%, 0.06 part by weight of methyldichlorosilane was added as a coupling agent, and a coupling reaction was carried out. After the coupling reaction was completed, hydrogen gas was supplied at a pressure of 0.4 MPa-Gauge and left for 10 minutes.
A coupling reaction was carried out by adding 0.07 part by weight of methyldichlorosilane as a coupling agent in the reaction vessel. After the coupling reaction was completed, hydrogen gas was supplied at a pressure of 0.4 MPa-Gauge and left for 10 minutes. When a partially extracted polymer was analyzed by GPC, the weight average molecular weight was about 150,000, and the coupling ratio (the content of the coupled copolymer in the total copolymer) was 60%. Moreover, when the infrared absorption spectrum of the partially taken out polymer was measured and calculated by the Morero method, the vinyl bond content was 64 mol%.

(2) Synthesis example 2
In a nitrogen-substituted reaction vessel, 500 parts by weight of degassed and dehydrated cyclohexane, 9 parts by weight of styrene and 5 parts by weight of tetrahydrofuran were charged, and 0.13 parts by weight of n-butyllithium was added at the polymerization initiation temperature of 40 ° C. Then, the temperature-heating polymerization was carried out to obtain an aromatic alkenyl polymer block (block A).
After the polymerization conversion of the aromatic alkenyl polymer block reaches approximately 100%, the reaction solution is cooled to 15 ° C., then 91 parts by weight of 1,3-butadiene is added, and further heating polymerization is performed to carry out conjugated diene. A polymer block (block B) was obtained.
After the polymerization conversion reached almost 100%, 0.06 part by weight of methyldichlorosilane was added as a coupling agent, and a coupling reaction was carried out. After the coupling reaction was completed, hydrogen gas was supplied at a pressure of 0.4 MPa-Gauge and left for 10 minutes.
A coupling reaction was carried out by adding 0.07 part by weight of methyldichlorosilane as a coupling agent in the reaction vessel. After the coupling reaction was completed, hydrogen gas was supplied at a pressure of 0.4 MPa-Gauge and left for 10 minutes. When a partially extracted polymer was analyzed by GPC, the weight average molecular weight was about 150,000, and the coupling ratio (the content of the coupled copolymer in the total copolymer) was 60%. Moreover, when the infrared absorption spectrum of the partially taken out polymer was measured and calculated by the Morero method, the vinyl bond content was 64 mol%.

(3) Commercial product 1
A commercially available styrene-ethylenebutylene copolymer (manufactured by JSR Corporation, trade name "DR1321P") was used as the base resin.

<Release agent>
The following was used as the release agent.
Release agent A: Saturated fatty acid amide-based release agent, ethylene bisstearic acid amide (EBSA) (manufactured by Nichiyu Co., Ltd., trade name "Alflow H50F")
Release agent B: Unsaturated fatty acid amide-based mold release agent, ethylene biserukaic acid amide (manufactured by Nihon Kasei Co., Ltd., trade name "Slipax R")
Release agent D: Metal soap release agent, calcium stearate (manufactured by Sakai Chemical Co., Ltd., trade name "SC-100")
Release agent E: Fluorine-based release agent, trifluoroethyl methacrylate (manufactured by Kyoeisha Chemical Co., Ltd., trade name "Light Ester M-3F")
Release agent F: Silicone release agent, silicone graft LDPE (manufactured by Toray Dow Corning, trade name "BY27-202H")

(Example 1)
For 100 parts by weight of the base resin of Synthesis Example 1, 5 parts by weight of a tackifier (manufactured by Arakawa Chemical Industry Co., Ltd., trade name "Arcon P100") and an antioxidant (manufactured by Ciba Specialty Chemicals Co., Ltd., trade name "Irganox 1010") 1 part by weight and 1.5 parts by weight of the release agent A as a release agent were blended to obtain a resin composition for a pressure-sensitive adhesive layer.
On the other hand, 1.5 parts by weight of the mold release agent A was blended with 100 parts by weight of the polypropylene resin (manufactured by Prime Polymer Co., Ltd., trade name "J715M") to obtain a resin composition for a base material layer.
The obtained resin composition for the pressure-sensitive adhesive layer and the resin composition for the base material layer were subjected to the T-die method under the conditions of an extrusion temperature of 200 ° C. and a cast roll temperature of 25 ° C. to obtain a thickness of the base material layer of 36 μm and a pressure-sensitive adhesive layer. The adhesive tape having a thickness of 4 μm was co-extruded, and the obtained adhesive tape was wound up to a winding length of 2000 m to obtain an adhesive tape roll.

(Examples 2 , 4 to 5, 8 to 15, Reference Examples 3, 6 to 7, Comparative Examples 1 to 5)
An adhesive tape roll was obtained in the same manner as in Example 1 except that the resin composition for the pressure-sensitive adhesive layer and the resin composition for the base material layer were blended and the winding lengths were as shown in Tables 2 and 3.

(evaluation)
The adhesive tape rolls obtained in Examples, Reference Examples, and Comparative Examples were evaluated as follows.
The results are shown in Tables 2 and 3.

(1) Evaluation of unfolding force In accordance with JIS Z 0237, the adhesive tape was unwound from the adhesive tape roll at a unwinding speed of 20 m / min, and the high-speed rewinding force was measured. Based on the obtained measured values, the deployability was determined according to the following criteria.
⊚: High-speed rewinding force is 2N / 50mm or less ○: High-speed rewinding force exceeds 2N / 50mm, 3.0N / 50mm or less ×: High-speed rewinding force exceeds 3.0N / 50mm

(2) Evaluation of the concentration of the release agent on the outermost surface of the pressure-sensitive adhesive layer The pressure-sensitive adhesive tape is unwound from the pressure-sensitive adhesive tape roll and cut out at a position up to 10 m from the end of the outside of the winding. A sample cut out at a position up to 10 m from the portion was used as a core side sample.
The concentration of the release agent on the outermost surface of the pressure-sensitive adhesive layer of the outer winding sample and the winding core side sample was measured by time-of-flight secondary ion mass spectrometry (TOF-SIMS).
From the obtained data, the rate of change in the concentration of the mold release agent on the outermost surface of the pressure-sensitive adhesive layer (| Agent concentration | / Concentration of mold release agent on the outermost surface of the adhesive layer of the outer sample × 100) was calculated and determined according to the following criteria.
⊚: Change rate is 10% or less ○: Change rate exceeds 10%, 30% or less ×: Change rate exceeds 30%

(3) Evaluation of Adhesive Strength Adhesive tape was unwound from the adhesive tape roll, and the one cut out at a position up to 10 m from the end of the outer winding was cut out with the outer sample and the position up to 10 m from the end on the winding core side. The sample was used as the core side sample.

A test piece was prepared by attaching an adhesive tape of an outer sample or a sample on the core side, which was shredded to a width of 25 mm, onto an acrylic resin plate having a thickness of 130 μm. The adhesive tape was attached to the acrylic resin plate at a speed of 300 mm / min using a pressure-bonding rubber roller of 2 kg at a room temperature of 23 ° C. and a relative humidity of 50%. Then, according to JIS Z 0237, the adhesive tape was peeled off at a speed of 300 mm / min, and the adhesive strength (180 ° peeling strength) of the outer winding sample and the core side sample was measured.
From the obtained data, the rate of change in adhesive strength (| adhesive strength of the core side sample-adhesive strength of the outer winding sample | / adhesive strength of the outer winding sample x 100) was calculated and determined according to the following criteria.
⊚: Change rate is 20% or less ○: Change rate exceeds 20%, 50% or less ×: Change rate exceeds 50%

According to the present invention, it is possible to provide an adhesive tape roll that is lightly expandable and has little change in the adhesive force of the adhesive tape regardless of the feeding position.

1 Adhesive tape roll 2 Adhesive tape 21 Base material layer 22 Adhesive layer

Claims (4)

An adhesive tape roll obtained by winding an adhesive tape having a base material layer and an adhesive layer into a roll shape.
The winding length is 300m or more,
The thickness of the base material layer is 20 to 200 μm, and the thickness of the pressure-sensitive adhesive layer is 2 to 30 μm.
The base material layer contains a polyolefin-based resin and a mold release agent (a), and the pressure-sensitive adhesive layer contains a styrene-based elastomer, a mold release agent (b) , and a tackifier .
The content of the release agent (b) in the pressure-sensitive adhesive layer is 0.5 to 1.5 parts by weight with respect to 100 parts by weight of the styrene-based elastomer, and the release agent in the base material layer. The content of (a) is 0.5 to 4 parts by weight with respect to 100 parts by weight of the polyolefin resin, and the content of the mold release agent (b) is the content of the mold release agent (a). It is 1/2 to 1 times the amount,
The concentration of the release agent (b) on the outermost surface of the pressure-sensitive adhesive layer at a position 10 m from the end on the winding core side is defined as the concentration on the winding core side, and the concentration of the pressure-sensitive adhesive layer at a position 10 m from the end on the outside of the winding core. When the concentration of the release agent (b) on the outermost surface is taken as the outer winding concentration, the concentration change rate represented by the following formula (1) is 10% or less.
Adhesive tape roll characterized by that.
｜ Concentration on the core side-Concentration on the outside of the winding ｜ / Concentration on the outside of the winding x 100 (1) The pressure-sensitive adhesive tape roll according to claim 1, wherein the content of the pressure-sensitive adhesive in the pressure-sensitive adhesive layer is 40 parts by weight or less with respect to 100 parts by weight of the base resin constituting the pressure-sensitive adhesive layer. .. The release agent (a) and (b) according to claim 1 or 2 , wherein the release agent (a) and (b) are an amine-based release agent, a silicon-based release agent, a fluorine-based release agent, or a metal soap-based release agent. Adhesive tape roll. The adhesive tape roll according to claim 1, 2 or 3 , wherein the release agents (a) and (b) are saturated fatty acid bisamides.

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