JP2007031672A - Pressure-sensitive adhesive tape having not been subjected to release treatment and manufacturing method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pressure-sensitive adhesive tape having not been subjected to a release-treatment which is suitable for a sterilizing treatment or the like, and also a manufacturing method thereof. <P>SOLUTION: The pressure-sensitive adhesives tape having not been subjected to a release treatment, which is manufactured by sequentially laminating base material having not been subjected to a release treatment and a removable pressure-sensitive adhesive layer, and the manufacturing method thereof are characterized in that, on at least the surface of the removable pressure-sensitive adhesive layer, a removable pressure-sensitive adhesive layer containing an acrylic oligomer and/or a plasticizer in the range of 30-700 parts by weight relative to 100 parts by weight of a crosslinkable functional group-containing acrylic polymer is formed and in that the adhesive strength of the removable pressure-sensitive adhesive layer in accordance with JIS-Z-0237 is a value in the range of 5-400 cN/19 mm. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a release treatment-less pressure-sensitive adhesive tape and a method for producing the same, and more particularly to a release treatment-less pressure-sensitive adhesive tape suitable for sterilization and the like and a method for producing the same.

A medical pressure-sensitive adhesive tape composed of a base material and a pressure-sensitive adhesive layer is used by being attached to or wrapped around the skin (keratin layer), and therefore has been subjected to appropriate sterilization treatment. Moreover, the medical adhesive tape is required to have an appropriate peelability that does not cause skin irritation and rash due to peel damage to the stratum corneum of the skin as well as appropriate adhesiveness to the skin.
Therefore, in recent years, a releasable pressure-sensitive adhesive composition and a medical pressure-sensitive adhesive tape have been proposed in consideration of the balance between skin adhesiveness and peelability.

  For example, a polymer alloy composed of 80 to 99.5% by mass of an acrylic polymer and 0.5 to 20% by mass of an acrylic oligomer having a number average molecular weight of 700 to 5,000 on a substrate, the number average Medical pressure-sensitive adhesive tape having a molecular weight of 90,000 to 250,000 and a polymer alloy having a ratio (Mw / Mn) of number average molecular weight (Mn) to mass average molecular weight (Mw) of 6 to 12 (external use) (Medication member) is disclosed (for example, refer to Patent Document 1).

  In addition, a pressure sensitive adhesive layer containing a drug is laminated on one surface of the base sheet, which is made of a (meth) acrylic acid ester-vinylpyrrolidone random copolymer having a vinylpyrrolidone content of 1 to 60 mol%. A medical pressure-sensitive adhesive tape (patch) has been disclosed (for example, see Patent Document 2).

Furthermore, various acrylic pressure-sensitive adhesive compositions containing an acrylic ester polymer and a liquid component and medical pressure-sensitive adhesive tapes (patch) using the same are known (for example, see Patent Document 3). More specifically, it is a patch having a pressure-sensitive adhesive layer made of a crosslinked polymer on one side of a support, and the 180 ° peel adhesion when the pressure-sensitive adhesive layer is bonded is 20 to 180 g / A patch having a width of 12 mm is disclosed. More specifically, it is a patch containing an acrylic ester polymer and a liquid plasticizer compatible with the polymer as the adhesive layer.
Japanese Patent Publication No. 6-4533 (Claims) Japanese Patent Publication No. 3-70685 (Claims) JP-A-5-139960 (Claims)

However, the medical pressure-sensitive adhesive tapes disclosed in Patent Documents 1 to 3 each adhere to the base material in a state in which the opposite surface (back surface) on which the pressure-sensitive adhesive layer is formed on the base material is subjected to a release treatment with a release agent. It is formed in a state where the adhesive layers are sequentially laminated, or the release treatment surface of another base material that has been subjected to the release treatment with the release agent faces the adhesive layer surface, and is sterilized by irradiation. There was a problem that the release agent easily migrated to the pressure-sensitive adhesive layer.
Furthermore, there was a problem that the silicone compound as a release agent bound and reacted with the pressure-sensitive adhesive layer due to irradiation, and did not function as a release agent.
Moreover, when manufacturing the medical adhesive tape disclosed in Patent Documents 1 to 3, it is necessary to separately use a release-treated substrate such as a release film, which requires a lot of manufacturing cost and manufacturing time. It was seen.

Therefore, in order to solve the above-mentioned problems, the present inventor conducted various experimental studies on a pressure-sensitive adhesive tape using a mixture of a specific acrylic polymer and a specific acrylic oligomer and / or a plasticizer. Even when a non-treated substrate is used, an adhesive tape that has high wettability to the skin, has a predetermined peel adhesive strength, has low skin irritation, and excellent restickability. And the present invention has been completed.
That is, an object of the present invention is to provide an exfoliation-less pressure-sensitive adhesive tape suitable for sterilization and the like and an efficient manufacturing method of such an exfoliation-less pressure-sensitive adhesive tape.

According to the present invention, there is provided a release treatment-less pressure-sensitive adhesive tape in which a release treatment-less base material and a re-peelable pressure-sensitive adhesive layer are sequentially laminated, and a crosslinkable functional group is provided on at least the surface of the re-peelable pressure-sensitive adhesive layer. While having a re-peelable pressure-sensitive adhesive layer containing acrylic oligomer and / or plasticizer in the range of 30 to 700 parts by weight with respect to 100 parts by weight of the acrylic polymer having JIS-Z-0237 of the re-peelable pressure-sensitive adhesive layer A release treatment-less pressure-sensitive adhesive tape having a compliant pressure-sensitive adhesive strength within a range of 5 to 400 cN / 19 mm is provided, and the above-described problems can be solved.
That is, by having a specific releasable pressure-sensitive adhesive layer, even when a base material that is not subjected to a release treatment is used, the adhesion between one surface of the release treatment-less base material can be improved. At the same time, a predetermined peelability can be maintained between the back surface.
In addition, by having a specific re-peelable adhesive layer, the wetted area to the skin is increased and a predetermined peel adhesive strength is obtained, while the skin irritation is low and the re-peelable adhesive is excellent. Tape can be obtained.

Further, in constituting the release treatment-less pressure-sensitive adhesive tape of the present invention, the number average molecular weight of the acrylic polymer is set to a value in the range of 300,000 to 1,500,000, and the number average of the acrylic oligomer and / or the plasticizer. The molecular weight is preferably set to a value within the range of 200 to 10,000.
By comprising in this way, while the cohesive force of the acrylic polymer to be used is high, compatibility with an acrylic oligomer and / or a plasticizer is good, and predetermined | prescribed adhesive force is obtained easily, and acrylic Outflow of the system oligomer and / or plasticizer and transpiration loss can be easily prevented.

Further, in constituting the release treatment-less pressure-sensitive adhesive tape of the present invention, it is preferable that a primer layer is provided or a corona discharge treatment is performed between one side of the release-treatment-less base material and the removable adhesive layer. .
By comprising in this way, even if it is a case where the base material which does not perform a peeling process is used, the adhesiveness of the releasable adhesion layer between the one surface of a peeling process-less base material can further be improved. In addition, a predetermined peelability can be maintained between the back surface and the back surface.

Moreover, when comprising the peeling process-less adhesive tape of this invention, it is preferable that the embossing process is given to both surfaces or one surface of a peeling process-less base material.
By comprising in this way, even if it is a case where the base material which does not perform a peeling process is used, the adhesiveness of the releasable adhesion layer between the one surface of a peeling process-less base material can further be improved. In addition, a predetermined peelability can be maintained between the back surface and the back surface.

Moreover, when comprising the peeling process-less adhesive tape of this invention, it is preferable to make the thickness of a releasable adhesive layer into the value within the range of 1-300 micrometers.
By comprising in this way, even if it is a case where the base material which does not perform a peeling process is used, the adhesiveness of the releasable adhesion layer between the one surface of a peeling process-less base material can further be improved. In addition, a predetermined peelability can be maintained between the back surface and the back surface.

Further, in constituting the release treatment-less pressure-sensitive adhesive tape of the present invention, it is preferable that a radiation irradiation sterilization treatment, for example, a gamma ray irradiation sterilization or an electron beam irradiation sterilization is performed.
By comprising in this way, an effective sterilization process can be performed.

Moreover, in constructing the release treatment-less pressure-sensitive adhesive tape of the present invention, it is preferable to set the radiation dose by radiation irradiation sterilization treatment within a range of 1 to 100 kGy.
By configuring in this way, it is possible to perform a better and complete sterilization treatment, and it is possible to reduce the possibility of damaging the release treatment-less base material even when the radiation output or the like varies. .

Another aspect of the present invention is a method for producing a release treatment-less pressure-sensitive adhesive tape in which a release treatment-less base material and a removable adhesive layer are sequentially laminated, and a step of preparing a release treatment-less base material And an acryl-based oligomer and / or a plasticizer in a range of 30 to 700 parts by weight with respect to 100 parts by weight of an acrylic polymer having a crosslinkable functional group as a releasable pressure-sensitive adhesive layer, JIS-Z-0237 Forming a re-peelable pressure-sensitive adhesive layer having a value within a range of 5 to 400 cN / 19 mm.
That is, by carrying out in this way, it is possible to improve the adhesion between one surface of the release treatment-less base material and to maintain a predetermined release property with the back surface. A less adhesive tape can be obtained efficiently.
Moreover, by carrying out in this way, the mixing and dispersion between the acrylic polymer and the acrylic oligomer and / or the plasticizer is improved, the wetted area with respect to the skin is increased, and a predetermined peel adhesive strength is obtained. On the other hand, it is possible to efficiently obtain an adhesive tape that is low in skin irritation and excellent in reattachability.

[First Embodiment]
As illustrated in FIG. 1A, the first embodiment is a release treatment-less pressure-sensitive adhesive tape 10 in which a release treatment-less base material 14 and a removable pressure-sensitive adhesive layer 12 are sequentially laminated. The releasable pressure-sensitive adhesive layer containing 30 to 700 parts by weight of an acrylic oligomer and / or a plasticizer with respect to 100 parts by weight of an acrylic polymer having a crosslinkable functional group on at least the surface of the peelable pressure-sensitive adhesive layer 12 In addition, the pressure-sensitive adhesive tape 10 has a releasable pressure-sensitive adhesive layer and has a pressure-sensitive adhesive strength in accordance with JIS-Z-0237 within a range of 5 to 400 cN / 19 mm.

1. Type of base material (1) The type of base material constituting a part of the release treatment-less pressure-sensitive adhesive tape is not particularly limited as long as it is a polymer material having appropriate strength and flexibility and having a large elongation at break. However, it is preferable to use a polymer material with good radiation stability suitable for radiation sterilization treatment with gamma rays or electron beams. More specifically, a polymer material that does not decrease mechanical strength or the like even when the radiation dose is at least 60 kGy level, more preferably 100 kGy level, is preferable.
Examples of such polymer materials include polyurethane resins, polyester resins, polyethylene resins, ethylene / vinyl acetate copolymer resins, ethylene / vinyl alcohol copolymer resins, ethylene / vinyl acetate / vinyl alcohol copolymer resins, Examples thereof include a nylon resin, a cellulose resin, and a polymer material obtained by mixing these resins.
Further, the form of the substrate is not particularly limited, and examples thereof include a film form, a fiber form, a paper form, or a film containing reinforcing fibers. Furthermore, the form of the substrate may be a perforated or embossed film or mesh, or a woven or non-woven fabric.

(2) Thickness Moreover, it is preferable to make the thickness of a base material into the value within the range of 5-2,000 micrometers. The reason for this is that when the thickness of the base material is less than 5 μm, the mechanical strength is lowered and it may not be suitable for use as an adhesive tape.
On the other hand, if the thickness of the base material exceeds 2,000 μm, it becomes excessively thick and difficult to handle, and when it is made of an adhesive tape, it may be easily peeled off from the skin. is there. Therefore, the thickness of the base material is more preferably set to a value within the range of 10 to 1,000 μm, and further preferably set to a value within the range of 20 to 500 μm.

(3) Primer layer Moreover, as shown in FIG.1 (b), it is preferable to provide the primer layer (a sizing layer and a corona discharge process layer are included) 16 on the surface of the base material 14. FIG.
The reason for this is that by configuring as described above, the adhesion between the substrate 14 and the pressure-sensitive adhesive layer 12 made of the re-peelable pressure-sensitive adhesive composition can be improved. This is because the transfer to the back surface of the substrate can be effectively prevented.
In addition, it is preferable to comprise such a primer layer from an acrylic resin, an epoxy resin, etc., for example.

2. Removable adhesive layer (1) Acrylic polymer having a crosslinkable functional group An acrylic polymer having a crosslinkable functional group constituting a part of the removable adhesive layer is a vinyl monomer having a crosslinkable functional group. It is a polymer obtained by copolymerizing or homopolymerizing an acrylic monomer containing
Therefore, the type is not particularly limited. For example, a vinyl monomer having a functional group such as a carboxyl group or a hydroxyl group, a (meth) acrylic acid alkyl ester having an alkyl group having 1 to 14 carbon atoms, An acrylic polymer obtained by copolymerization of is preferred.
The reason for this is that an acrylic polymer composed of such a monomer component is easily cross-linked by an external cross-linking agent to improve cohesion, and is easily compatible with a predetermined acrylic oligomer to maximize the wetted area. This is because the size can be effectively increased.

  In addition, such (meth) acrylic acid alkyl esters having 1 to 14 carbon atoms in the alkyl group include methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, and (meth) acrylic. Acid isopropyl, (meth) acrylate 2-methoxyethyl, (meth) butyl acrylate, (meth) acrylate isobutyl, (meth) acrylate pentyl, (meth) acrylate hexyl, (meth) acrylate octyl, ( Examples include one or more combinations of isooctyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, nonyl (meth) acrylate, isononyl (meth) acrylate, lauryl (meth) acrylate, and the like. .

On the other hand, as the vinyl monomer having a crosslinkable functional group, for example, (meth) acrylic acid having a carboxyl group or (meth) acrylic acid 2-hydroxylethyl having a hydroxyl group may be used alone or in combination of two or more. Can be mentioned.
Moreover, it is preferable to make the compounding quantity of this monomer into the value within the range of 1-15 mass% with respect to the whole quantity of the monomer component at the time of superposing | polymerizing.
The reason for this is that when the blending amount of the monomer is less than 1% by mass, the crosslinking becomes insufficient and the peel adhesion to the skin may not be improved. On the other hand, when the blending amount of the monomer exceeds 15% by mass, the skin irritation of the releasable pressure-sensitive adhesive composition may be increased.

The acrylic polymer having a crosslinkable functional group preferably contains at least one monomer component identical to the acrylic oligomer described later.
The reason for this is that the compatibility between the acrylic polymer and the acrylic oligomer is remarkably improved when the acrylic polymer and the acrylic oligomer contain the same monomer component.

The number average molecular weight of the acrylic polymer is preferably set to a value in the range of 300,000 to 1,500,000.
The reason for this is that when the number average molecular weight of the acrylic polymer is less than 300,000, the internal cohesive force of the pressure-sensitive adhesive becomes insufficient and adhesive residue may occur. On the other hand, when the number average molecular weight of the acrylic polymer exceeds 1,500,000, uniform mixing becomes difficult and stable physical properties may not be obtained.
Therefore, the number average molecular weight of the acrylic polymer is more preferably set to a value in the range of 500,000 to 1,500,000, and a value in the range of 700,000 to 1,000,000. Further preferred.
The number average molecular weight of the acrylic polymer can be measured using a gel permeation chromatography method (GPC method).

Moreover, it is preferable to make the glass transition temperature (Tg1) of an acrylic polymer into the value within the range of -70 to -10 degreeC, and it is more preferable to set it as the value within the range of -45 to -15 degreeC.
The reason for this is that when the glass transition temperature of such an acrylic polymer is less than -70 ° C, the re-peelable pressure-sensitive adhesive composition may be easily transferred to the back surface of the substrate or the skin irritation may be increased. is there. On the other hand, when the glass transition temperature of such an acrylic polymer exceeds −10 ° C., the peel adhesive strength of the removable pressure-sensitive adhesive composition to the skin may be significantly reduced.
The glass transition temperatures of the acrylic polymer and the acrylic oligomer described below can be measured using a differential scanning calorimeter (DSC), respectively, or can be calculated from the Fox equation.

(2) Acrylic oligomer and plasticizer Moreover, regarding the acrylic oligomer which comprises a part of re-peelable adhesion layer, as a monomer component, the vinyl monomer which has at least 1 lactam ring in a molecule | numerator is 2-40, for example. It is preferable to use in the range of mol%.
The reason for this is that by using a predetermined amount of the vinyl monomer having a lactam ring, the wetted area (S) with respect to the skin is appropriately increased without increasing the adhesive force (F) per unit area specific to the pressure-sensitive adhesive. This is because a predetermined peel adhesive force (W = S × F) can be easily obtained. Moreover, if the oligomer using such a vinyl monomer is used, even if it is added in a relatively large amount, it can exhibit good skin peelability without causing an excessive decrease in cohesive strength in the acrylic polymer. . Furthermore, an oligomer using such a vinyl monomer improves compatibility with an acrylic polymer, and when a drug or additive is added to a removable adhesive composition, This is because it becomes easy to disperse.
A preferable example of the vinyl monomer having such a lactam ring is a water-soluble vinyl monomer, and in particular, N-vinyl-2-pyrrolidone, N-vinyl-2-piperidone, N-vinyl-ε-caprolactam. Or a combination of two or more thereof.

The amount of vinyl monomer having a lactam ring is set to a value within the range of 2 to 40 mol% with respect to the total amount of monomer components. This is because if the value is less than%, the effect of increasing the wetted area on the skin may not be exhibited. On the other hand, when the amount of the vinyl monomer having a lactam ring exceeds 40 mol%, the acrylic pressure-sensitive adhesive polymer becomes insufficiently plasticized, or the viscosity is excessively increased. This is because it may be difficult to mix uniformly.
Therefore, the amount of vinyl monomer having a lactam ring is more preferably set to a value in the range of 5 to 35 mol% with respect to the total amount of monomer components.

Moreover, the kind of monomer components other than the vinyl monomer having a lactam ring is not particularly limited. For example, it is preferable to use a (meth) acrylic acid alkyl ester having an alkyl group having 2 to 14 carbon atoms. More specifically, ethyl (meth) acrylate, propyl (meth) acrylate, isopropyl (meth) acrylate, 2-methoxyethyl (meth) acrylate, butyl (meth) acrylate, isobutyl (meth) acrylate , Pentyl (meth) acrylate, hexyl (meth) acrylate, octyl (meth) acrylate, isooctyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, nonyl (meth) acrylate, (meth) acrylic acid One type alone or a combination of two or more types such as isononyl and lauryl (meth) acrylate can be mentioned.
Furthermore, as a monomer component of such an acrylic oligomer, a combination of 2-ethylhexyl acrylate and N-vinyl-2-pyrrolidone is preferable.

On the other hand, as a plasticizer constituting a part of the releasable pressure-sensitive adhesive layer, an acrylic resin having a high boiling point organic liquid compound that hardly exhibits a vapor pressure in a living environment temperature range and having a crosslinkable functional group Organic liquid compounds with good compatibility with the polymer are preferred.
Examples of such organic liquid compounds include monovalent alcohols of saturated or unsaturated fatty acids having a linear or branched alkyl group having 8 to 20 carbon atoms and monohydric alcohols or dihydric or tetrahydric polyhydric alcohols. Esters or polyvalent esters; polyoxyalkylene glycols such as polyethylene glycol and polypropylene glycol; divalent and trivalent polyvalent carboxylic acids and alcohols having a linear or branched alkyl group having 8 to 18 carbon atoms Esters of saturated or unsaturated fatty acids having a linear or branched alkyl group having 8 to 20 carbon atoms and polyoxyalkylene glycols; linear having 8 to 18 carbon atoms Or monoglyceryl ethers or dialkyl glyceryl ethers of monohydric alcohols having branched alkyl groups and glycerin S; and a monohydric alcohol carbon atoms having a linear or branched alkyl group having 8 to 18, mono-ethers of polyoxyalkylene glycols are preferably used.
Specifically, monovalent esters include isocetyl 2-ethylhexanoate, hexyl laurate, decyl oleate, hexadecyl isostearate, isopropyl myristate, octyldodecyl myristate, oleyl oleate, sorbitan monolaurate Sorbitan monooleate, sorbitan monoisostearate, glyceryl monooleate, polyoxyethylene glycol monooleate and the like.
Examples of polyvalent esters include sorbitan dioleate, sorbitan trioleate, sorbitan tetrastearate, glycerin tris-2-ethylhexanoate, di-2-ethylhexyl adipate, di-2-hexyldecyl adipate, Examples include diisostearyl sebacate, triisocetyl trimellitic acid, trioleyl trimellitic acid, and the like.
Examples of polyoxyalkylene glycols include polyethylene glycol 200, polyethylene glycol 400, polypropylene glycol 2000, and polyoxyethylene polyoxypropylene glycol.
Examples of monoalkyl glyceryl ethers include monoisostearyl glyceryl ether and monooleyl glyceryl ether.
Examples of the polyoxyalkylene glycol monoalkyl ether include polyoxyethylene glycol monooleyl ether and polyoxypropylene glycol monobutyl ether.
In addition, fats and oils such as lemon oil, olive oil, castor oil, cottonseed oil, squalane, lanolin or lanolin can also be used effectively.

Moreover, it is preferable to make the number average molecular weights of an acrylic oligomer and a plasticizer into the value within the range of 200-10,000, respectively.
This is because when the number average molecular weight of such an acrylic oligomer or the like is less than 200, it easily penetrates into the skin and the skin irritation in the releasable pressure-sensitive adhesive composition may increase. On the other hand, if the number average molecular weight of such an acrylic oligomer exceeds 10,000, the acrylic pressure-sensitive adhesive polymer becomes insufficiently plasticized, or the viscosity is excessively increased to be uniform with the acrylic pressure-sensitive adhesive polymer. This is because it may be difficult to mix with the skin, and the wettability to the skin may be reduced.
Therefore, it is more preferable to set the number average molecular weight of the acrylic oligomer or the like to a value within the range of 300 to 7,000.
The number average molecular weight of such acrylic oligomers can be measured using gel permeation chromatography (GPC).

Moreover, it is preferable to mix | blend the compounding quantity of an acrylic oligomer and / or a plasticizer in the range of 30-700 weight part with respect to 100 weight part of acrylic polymers which have a crosslinkable functional group.
The reason for this is that when the amount of the acrylic oligomer or the like is less than 30 parts by weight, the wettability to the skin may be significantly reduced. On the other hand, when the blending amount of the acrylic oligomer exceeds 700 parts by weight, the cohesive strength of the pressure-sensitive adhesive is excessively reduced, and adhesive residue is generated on the skin, or a predetermined peel adhesive strength cannot be obtained. Because there is.
Therefore, the blending amount of the acrylic oligomer and / or the plasticizer is more preferably set to a value within the range of 50 to 500 parts by weight with respect to 100 parts by weight of the acrylic polymer having a crosslinkable functional group. As will be described later, when an acrylic polymer having no crosslinkable functional group is used in combination with an acrylic polymer having a crosslinkable functional group, the blending amount of the acrylic oligomer is determined by the crosslinkable functional group. It is more preferable to set the value within the range of 300 to 700 parts by weight with respect to 100 parts by weight of the acrylic polymer having the above.

  The method for producing the acrylic oligomer is not particularly limited. For example, the acrylic monomer is polymerized using a predetermined amount of chain transfer agent (such as lauryl mercaptan or mercaptoethanol) while adjusting the number average molecular weight. (Homopolymerization or copolymerization) is preferable. More specifically, while using a solvent such as ethyl acetate, solution polymerization in which a predetermined amount of chain transfer agent is added, and emulsion polymerization in which a predetermined amount of chain transfer agent is added while using an aqueous solvent, etc. It is preferable to manufacture.

(3) Acrylic polymer having no crosslinkable functional group In addition, as a part of the releasable pressure-sensitive adhesive layer, an acrylic polymer having no crosslinkable functional group is converted to an acrylic polymer having a crosslinkable functional group; It is preferable to use together. That is, by using such an acrylic polymer in combination, the wettability with respect to the skin can be improved without excessively reducing the cohesive force.

Here, the acrylic polymer having no crosslinkable functional group is a polymer that does not contain a vinyl monomer having a crosslinkable functional group as a monomer component, for example, an alkyl group having 1 carbon atom. It is preferable that it is an acryl-type polymer obtained by superposing | polymerizing (meth) acrylic-acid alkylester of -14. Moreover, like an acrylic oligomer, it is more preferable that it is an acrylic polymer obtained by copolymerizing the vinyl monomer which has a lactam ring in the range of 1-40 mol%, for example.
In addition, about the number average molecular weight and glass transition point of the acrylic polymer which does not have a crosslinkable functional group, it can be set as the content similar to the acrylic polymer which has a crosslinkable functional group mentioned above.

  Moreover, when using together the acrylic polymer which does not have a crosslinkable functional group with the acrylic polymer which has a crosslinkable functional group, the addition amount is 1 with respect to the whole quantity of a releasable adhesive composition. A value in the range of ˜50 mass% is preferable. This is because when the amount added is less than 1% by mass, the effect of addition does not appear and the wettability to the skin may not be improved. On the other hand, when the added amount exceeds 50% by mass, the existing amount of the acrylic polymer having a functional group capable of relatively crosslinking is decreased, and as a result, the cohesive force may be decreased. Therefore, it is more preferable that the addition amount of the acrylic polymer having no crosslinkable functional group is set to a value within the range of 5 to 45% by mass with respect to the total amount of the releasable pressure-sensitive adhesive composition. More preferably, the value is in the range of -35% by mass.

(4) Crosslinking agent Moreover, it is preferable to crosslink by adding a crosslinking agent to the intermediate composition which consists of an acrylic polymer and an acrylic oligomer. That is, in order to adjust the cohesive strength of the acrylic polymer, for example, it is preferable to add 0.01 to 15% by mass of a crosslinking agent with respect to the total amount of the intermediate composition. The reason for this is that when the amount of the crosslinking agent added is less than 0.01% by mass, the crosslinking becomes insufficient, and adhesive residue may be generated. On the other hand, when the addition amount of the crosslinking agent exceeds 15% by mass, the crosslinking proceeds excessively, and the wettability to the skin may be remarkably lowered. Therefore, it is more preferable to set the addition amount of the cross-linking agent to a value within the range of 0.05 to 8% by mass with respect to the total amount of the intermediate composition, and within the range of 0.1 to 5% by mass. More preferably, it is a value. Preferred types of crosslinking agents include, for example, polyvalent epoxy compounds such as ethylene glycol-diglycidyl ether and triglycidyl isocyanurate, polyvalent isocyanate compounds as addition derivatives of tolylene diisocyanate and hexamethylene diisocyanate, Examples include an aziridine compound or a polyvalent metal chelate compound.

(5) Additive In addition, a preparation (drug) can be added as a kind of additive in the re-peelable pressure-sensitive adhesive composition so as to exhibit a predetermined medicinal effect. The type of such a preparation is not particularly limited, but examples include anti-inflammatory drugs, anti-inflammatory analgesics, coronary vasodilators, asthma drugs, antihypertensive drugs, antihistamines, tranquilizers, antibiotics, anesthetics, One type of vitamin agent or the like, or a combination of two or more types may be mentioned. Moreover, although the addition amount of a formulation changes with kinds of a formulation and the use of a releasable adhesive composition, it is the range of 0.1-30 mass% with respect to the whole quantity of a releasable adhesive composition, for example. It is preferable to set the value within the range.
Moreover, it is preferable to add various additives in a releasable adhesive composition. Examples include antioxidants, viscosity modifiers, ultraviolet absorbers, masking agents, plasticizers, waxes, colorants, inorganic fillers, organic fillers, extenders, coupling agents and the like alone or in combination of two or more. .

(6) Manufacturing method Although it does not restrict | limit especially as a manufacturing method of a releasable adhesive composition, For example, it is preferable to depend on the following manufacturing processes ad. When implemented in this manner, the mixing and dispersion between the acrylic polymer and the acrylic oligomer and / or the plasticizer is further improved, and a re-peelable pressure-sensitive adhesive composition excellent in restickability is efficiently obtained. be able to.
a. Preparing an acrylic polymer having a crosslinkable functional group and having a number average molecular weight of 300,000 to 1,500,000 b. Preparing an acrylic oligomer and / or a plasticizer having a number average molecular weight of 200 to 10,000 polymerized by containing 2 to 40 mol% of a vinyl monomer having a lactam ring as a monomer component c. Step of blending acrylic oligomer and / or plasticizer in an amount of 30 to 700 parts by weight with respect to 100 parts by weight of the acrylic polymer to obtain an intermediate composition d. A step of adding a crosslinking agent to the intermediate composition to crosslink It is to be noted that a step of polymerizing an acrylic polymer having no crosslinkable functional group and optionally adding it to the intermediate composition is added. It is also preferable to provide a step of providing or mixing and adding a preparation (drug) and an additive.

3. Production method The production method of the release treatment-less pressure-sensitive adhesive tape is not particularly limited. For example, the re-peelable pressure-sensitive adhesive composition is uniformly applied onto the substrate using a roll coater, comma coater, knife coater, etc. By doing so, it can be manufactured easily.

4). Peeling adhesive strength Peeling adhesive strength of a peeling treatment-less pressure-sensitive adhesive tape comprising a releasable pressure-sensitive adhesive layer made of a re-peelable pressure-sensitive adhesive composition in accordance with JIS Z0237 (mode: 180 ° peeling, adherend: phenol resin plate , Peeling rate: 300 mm / min) is preferably set to a value within the range of 5 to 400 cN / 19 mm (5.1 to 255 gf / 19 mm).
The reason for this is that when the peel adhesive strength is less than 5 cN / 19 mm, it peels easily from the skin or the like, and may have a poor function as an adhesive tape. On the other hand, if the peel adhesive strength exceeds 400 cN / 19 mm, it becomes difficult to remove the re-peelable pressure-sensitive adhesive composition from the skin, or the skin irritation becomes excessively high, resulting in discomfort during use. This is because it may occur. Therefore, it is more preferable to set the value within the range of 40 to 250 cN / 19 mm, and further preferable to set the value within the range of 60 to 200 cN / 19 mm. In addition, it is also preferable to adjust the peeling adhesive force of a peeling treatment-less pressure-sensitive adhesive tape by applying a pattern to the re-peelable pressure-sensitive adhesive composition without coating the entire surface of the substrate.

  Hereinafter, embodiments of the present invention will be described in detail. However, the following description shows the present invention by way of example, and the contents of the present invention are not limited to these descriptions.

[Example 1]
1. Production of re-peelable pressure-sensitive adhesive composition and exfoliation treatment-less pressure-sensitive adhesive tape (1) Production of acrylic oligomer 20.5 g of N-vinyl-2-pyrrolidone (0.185 mol, mixed molar fraction: 12.0 mol%) 2-ethylhexyl acrylate (250 g, 1.356 mol, mixed molar fraction: 88.0 mol%), and 18.2 g (0.09 mol) of lauryl mercaptan as a chain transfer agent, Each monomer solution was uniformly dissolved in 73 g of ethyl acetate to prepare a monomer mixed solution. This monomer mixed solution was charged into a polymerization reactor equipped with a stirrer equipped with a vapor condensation reflux tower, and 0.5 g of azobisisobutyronitrile (hereinafter referred to as AIBN) was added as a polymerization initiator. Subsequently, after further stirring in a nitrogen stream until the monomer mixed solution became uniform, the polymerization reactor was immersed in a hot water bath at 55 ° C. to initiate solution polymerization. Since the temperature of the reaction solution begins to increase rapidly due to the generated heat of polymerization reaction at the same time as the polymerization starts, the water bath is appropriately switched to a water-cooled bath to remove heat and the temperature of the polymerization reaction solution is controlled to 65 ± 5 ° C. The solution polymerization was performed for about 2 hours. During this time, the viscosity of the reaction solution increased with the progress of the polymerization reaction. When the exothermic reaction was almost completed, 0.04 g of AIBN was further added, and then switched to a hot water bath, the temperature of the reaction solution was raised to 70 ± 2 ° C., and the mixture was heated for about 5 hours to complete the polymerization reaction. .
Next, the polymerization reaction solution (acrylic oligomer) was taken out from the polymerization reactor, and the concentration (nonvolatile content) of the obtained acrylic oligomer was measured by a dry-solid method (150 ° C., 1 hour). Met.
Further, the obtained polymerization reaction solution was heated to 85 ° C. under a reduced pressure of 1 mmHg to remove ethyl acetate as a solvent to obtain a viscous acrylic oligomer liquid. When the viscosity of the obtained acrylic oligomer was measured using a B-type viscometer, it was 63 dPa · S (measurement temperature: 25 ° C., the same applies hereinafter).
Furthermore, the number average molecular weight (hereinafter the same) in terms of polystyrene, measured using the GPC method, was 3,200.

(2) Production of an acrylic polymer having a crosslinkable functional group 20 g (11 parts by weight) of acrylic acid, 180 g (100 parts by weight) of 2-ethylhexyl acrylate, and 300 g of ethyl acetate are mixed with monomers. It was set as the solution. Next, the obtained monomer mixed solution was charged into a polymerization reactor equipped with a stirrer equipped with a vapor condensation reflux column, 0.12 g of AIBN was added as a polymerization initiator, and the inside of the reaction vessel was purged with nitrogen. It was immersed in a hot water bath to initiate solution polymerization. At the same time as the initiation of polymerization, the temperature of the reaction solution starts to increase due to the generated heat of polymerization reaction. Therefore, heat is appropriately switched to a water-cooled bath to remove heat, and the temperature of the polymerization reaction solution is controlled to 70 ± 5 ° C. Solution polymerization was carried out for a time. During this time, the viscosity of the reaction solution increased with the progress of the polymerization reaction. When the exothermic reaction was almost completed, 0.02 g of AIBN was further added, and then the polymerization reaction was completed by heating for about 5 hours while switching to a hot water bath and controlling the reaction solution temperature at 70 ± 2 ° C. Next, the viscous polymerization reaction solution was taken out from the polymerization reactor, and the concentration (nonvolatile content) of the obtained acrylic polymer was measured by a dry-solid method (150 ° C., 1 hour). It was. Moreover, when the solution viscosity (25 degreeC, the viscosity as an ethyl acetate solution using a B-type viscometer, and so on) of the acrylic polymer which has a crosslinkable functional group was measured, it was 48 dPa * S. Yes, the number average molecular weight measured by GPC was 550,000.

(3) Crosslinking and laminating step Polyhydric isocyanate as a reactive crosslinking agent in an intermediate composition obtained by mixing 85 g of the obtained acrylic oligomer and 100 g of an ethyl acetate solution of a crosslinkable acrylic polymer (42 g as an acrylic polymer). 2.5 g of a compound (Nihon Polyurethane, Coronate HL) was added. Thereafter, by further adding and adjusting ethyl acetate, a re-peelable pressure-sensitive adhesive composition (ethyl acetate solution) having a non-volatile residue of 50% by mass was obtained. The content of the acrylic oligomer in this re-peelable pressure-sensitive adhesive composition was 67% by mass. Next, the obtained re-peelable pressure-sensitive adhesive composition was uniformly laminated and coated on one side of a polyethylene film (50 μm thickness) as a release treatment-less base material after a corona discharge treatment as a primer treatment, It heat-dried at 110 degreeC, and manufactured the exfoliation processing-less adhesive tape (adhesive adhesive plaster) whose thickness of a releasable adhesive layer is 40 micrometers.

2. Evaluation (1) Peeling Adhesive Force The peeling adhesive strength of the obtained release treatment-less pressure-sensitive adhesive tape was measured according to JIS-Z-0237. The obtained results are shown in Table 1.

(2) Measurement of change in peel adhesion force to release treatment-less base material due to change in radiation (gamma ray) irradiation dose Further, the obtained release treatment-less adhesive tape was formed into a strip-shaped test piece (width: 19 mm, length:
50 mm), the two test pieces are set as one set, and the re-peeling adhesive layer surface of the first test piece is the back surface of the second test piece with no peeling treatment (that is, peeling). A test piece set was prepared by concentrically bonding to the treatment-less substrate surface). This test piece set is placed on a gamma ray irradiation treatment facility and irradiated with 20 kGy. After the first and second test pieces are peeled off, the second test for the first test piece is performed. The peel adhesion to the back of the piece was measured. In the actual measurement, five sets of test pieces were prepared and measured for one release treatment-less pressure-sensitive adhesive tape, and the average value thereof was used as the evaluation of the peel adhesion to the release treatment-less substrate.
Furthermore, except that the radiation dose of 20 kGy was 40 kGy and 60 kGy, respectively, the release treatment-less pressure-sensitive adhesive tape was irradiated with radiation in the same manner as described above, and the peel adhesion force to the release treatment-less substrate was measured. did. The obtained results are shown in Table 1, FIG. 2 and FIG.
At this time, the retention rate (%) of the peel adhesive strength with respect to the release treatment-less base material was calculated from the following formula.
Maintenance rate (%) of peel adhesive strength with respect to release treatment-less substrate = (Peel adhesion force with respect to release treatment-less substrate after irradiation / Peel adhesion force with respect to release treatment-less substrate before irradiation) × 100
2 and 3, A is Comparative Example 2, B is Comparative Example 1, C is Example 1, D is Example 2, E is Example 3, F is Example 4, and G is Example. 5 and H are data of measurement results of the adhesive tape of Example 6, I is of Example 7, and J is Example 8 of the adhesive tape.

[Examples 2 to 4]
In Examples 2 to 4, as shown in Table 1, within the range specified by the present invention, except for changing the monomer composition, the type of plasticizer, or the blending amount thereof, the stripping treatment was not performed as in Example 1. Each adhesive tape was made and evaluated.
As a result, in each case, the maintenance rate of the peel adhesion to the release treatment-less base material before and after the effective sterilization treatment with an irradiation dose of 20 kGy is within a range of 100 ± 40%, and the peel adhesion strength to the release treatment-less base material It has been found that a pressure-sensitive adhesive tape that does not become excessively large and has excellent restickability can be obtained.

[Example 5]
1. Production of re-peelable pressure-sensitive adhesive composition and exfoliation treatment-less pressure-sensitive adhesive tape (1) Production of acrylic oligomer According to Example 1, an acrylic oligomer liquid was obtained with the formulation shown in Table 2. The viscosity of the obtained acrylic oligomer was 88 dPa · S, and the number average molecular weight was 2200.

(2) Production of Acrylic Polymer Having Crosslinkable Functional Group Acrylic acid 14 g (7 parts by weight) and 2-ethylhexyl acrylate 200 g (100 parts by weight) are dissolved in 262 g of ethyl acetate, did. Next, the obtained monomer mixed solution was charged into a polymerization reactor equipped with a stirrer equipped with a vapor condensation reflux tower, and 0.12 g of AIBN was added as a polymerization initiator, and then the inside of the reaction vessel was replaced with a nitrogen stream, and then 65 ° C. Was immersed in a hot water bath to initiate solution polymerization. At the same time as the initiation of polymerization, the temperature of the reaction solution starts to increase due to the generated heat of polymerization reaction, so the water bath is appropriately switched to a water-cooled bath to remove heat and control the temperature of the polymerization reaction solution to 70 ± 5 ° C. for about 2 hours. Solution polymerization was performed. During this time, as the polymerization reaction proceeds, the viscosity of the reaction solution increases. At the stage where the exothermic reaction was almost completed, 0.02 g of AIBN was further added, and then the bath was switched to a hot water bath and heated to about 5 hours while controlling the reaction solution temperature at 70 ± 2 ° C. to complete the polymerization reaction.
Next, a viscous polymerization reaction solution was taken out from the polymerization reactor, and the concentration (nonvolatile content) of the obtained acrylic polymer was measured by a dry solid method (150 ° C., 1 hour). As a result, it was 46.5% by mass. It was. Moreover, when the solution viscosity of the obtained acrylic polymer was measured, it was 43 dPa · S, and the number average molecular weight measured by the GPC method was 480,000.

(3) Production of acrylic polymer having no crosslinkable functional group 36.0 g of N-vinyl-2-pyrrolidone and 125 g of 2-ethylhexyl acrylate were dissolved in 343 g of ethyl acetate to obtain a monomer mixed solution. . Next, the obtained monomer mixed solution was charged into a polymerization reactor equipped with a stirrer equipped with a vapor condensation reflux tower, and after adding 0.12 g of AIBN as a polymerization initiator, the inside of the reaction vessel was replaced with a nitrogen stream. It was immersed in a 65 ° C. hot water bath to initiate solution polymerization. At the same time as the start of polymerization, the temperature of the reaction solution begins to rise due to the generated heat of polymerization reaction, so the water bath is appropriately switched to a water-cooled bath to remove heat and control the temperature of the polymerization reaction solution to 75 ± 5 ° C for about 2 hours. Solution polymerization was performed. During this time, as the polymerization reaction proceeds, the viscosity of the reaction solution increases. At the stage where the exothermic reaction was almost completed, 0.02 g of AIBN was further added, and then the bath was switched to a hot water bath and heated to about 5 hours while controlling the reaction solution temperature at 70 ± 2 ° C. to complete the polymerization reaction. Next, the viscous polymerization reaction solution was taken out from the polymerization reactor, and the concentration (nonvolatile content) of the obtained acrylic polymer was measured by a dry-solid method (150 ° C., 1 hour) and found to be 34.0% by mass. It was. Moreover, when the solution viscosity of the obtained acrylic polymer was measured, it was 110 dPa · S, and the number average molecular weight measured by GPC was 670,000.

(4) Crosslinking and lamination step 50 g of the obtained acrylic oligomer, 21.5 g of an acrylic polymer solution having a crosslinkable functional group (10 g as an acrylic polymer), and an acrylic polymer having no crosslinkable functional group To an intermediate composition obtained by mixing 88 g of the solution (30 g as an acrylic polymer), 0.25 g of aluminum trisacetylacetonate was added as a reactive crosslinking agent. Thereafter, by further adding and adjusting ethyl acetate, a re-peelable pressure-sensitive adhesive composition (ethyl acetate solution) having a non-volatile residue of 50% by mass was obtained. The content of the acrylic oligomer in this removable pressure-sensitive adhesive composition was 56% by mass. Next, the obtained re-peelable pressure-sensitive adhesive composition was uniformly laminated and coated on one side of a polyester nonwoven fabric (thickness 40 μm) as a release treatment-less base material after performing corona discharge treatment as a primer treatment, It heat-dried at 110 degreeC, and manufactured the exfoliation processing-less adhesive tape (adhesive adhesive plaster) whose thickness of a releasable adhesive layer is 40 micrometers.

2. Evaluation The peel adhesive strength of the obtained release treatment-less pressure-sensitive adhesive tape and the peel adhesion strength to the release treatment-less substrate were evaluated in the same manner as in Example 1. As a result, as shown in Table 2, the retention rate of the peel adhesive strength to the release-less substrate before and after the effective sterilization treatment with a radiation dose of 20 kGy is within the range of 100 ± 40%, respectively, It was found that an excellent release-treated adhesive tape can be obtained.

[Examples 6 to 8]
In Examples 6-8, as shown in Table 2, within the range specified by the present invention, the release treatment was carried out in the same manner as in Example 5 except that the type of acrylic oligomer or plasticizer or the blending amount thereof was changed. A less adhesive tape was made and evaluated. As a result, the retention rate of the peel adhesive strength to the base material without release treatment before and after the effective sterilization treatment with a radiation dose of 20 kGy is within the range of 100 ± 40%, respectively, and the release treatment-less pressure-sensitive adhesive tape excellent in restickability Was found to be obtained.

[Comparative Examples 1 and 2]
In Comparative Examples 1 and 2, the tape was evaluated in accordance with Example 1 using an adhesive tape using a conventionally used silicone release treatment substrate. The results are shown in Table 3, FIG. 2 and FIG.
From these results, in Comparative Example 1, as the gamma dose as radiation increases, the peel adhesion to the silicone release treatment substrate increases remarkably, and the peel adhesion to the silicone release treatment substrate before irradiation is maintained. It turns out that it is difficult to do. Further, in Comparative Example 2, even when the gamma dose as radiation is increased, the maintenance rate of the peel adhesive strength to the silicone release treatment substrate can be kept relatively low. It can be seen that as a result of the large peel adhesion to the silicone-treated substrate at the stage, the increase in peel adhesion to the silicone-treated substrate with increasing radiation dose is very large.

[Comparative Example 3]
As shown in Table 4, in Comparative Example 3, except for blending the amount of the acrylic oligomer outside the range defined by the present invention, a release treatment-less pressure-sensitive adhesive tape was prepared according to Example 1, evaluated. As a result, when the first test piece of the test piece set irradiated with a gamma dose of 20 kGy radiation was peeled from the back of the second test piece, the first test piece was peeled again. If the adhesive layer is excessively strongly adhered to the back of the second test piece and is forced to peel off, the re-peeling adhesive layer of the first test piece is transferred to the back of the second test piece. As a result, it was not possible to measure the peel adhesive strength of the release treatment-less pressure-sensitive adhesive tape to the release treatment-less base material.

[Comparative Examples 4 to 6]
As shown in Table 4, in Comparative Examples 4 to 6, in accordance with Example 1, except that the type and blending amount of the acrylic oligomer and / or the plasticizer were changed within the range defined by the present invention. A peel-less adhesive tape was prepared and evaluated. As a result, in each of the comparative examples, the same result as in the above-mentioned comparative example 3 was obtained and measurement could not be performed. Moreover, in Comparative Example 4, as a result of the cohesive failure of the adhesive layer due to the insufficient cohesive force of the removable adhesive layer at the stage of measuring the peel adhesive force, adhesive residue on the adherend was generated, and the peeling treatment was performed. It was not possible to measure the normal peel adhesive strength of the adhesive tape.

According to the present invention, in spite of the use of a release treatment-less base material, the wettability to the skin is high, there is little skin irritation while having an appropriate peel adhesive force, and excellent re-stickability. In addition, it has become possible to efficiently obtain a pressure-sensitive adhesive tape that is suitable for sterilization and the like.
Therefore, the acrylic oligomer or plasticizer substrate back surface can be used even if the adhesive tape is peeled off in roll form, or it is stored in a sheet form in double or multiple layers and stored under high temperature conditions or long time conditions. Can be effectively prevented, and there is no need to worry about the transfer of the release agent during sterilization or storage. Even in a sheet-like form in which the sheets are stacked in layers of multiple layers or more, the shape is not lost and rewinding at the time of use is facilitated. As a result, a release treatment-less pressure-sensitive adhesive tape excellent in restickability was obtained. That is, an extremely useful pressure-sensitive adhesive tape can be provided as a medical pressure-sensitive adhesive tape.

It is a figure provided in order to demonstrate the structural example of the peeling process less adhesive tape of this invention. It is a figure provided in order to demonstrate the relationship between the radiation dose in the peeling process-less adhesive tape of this invention, and the peeling adhesive force with respect to a peeling processless base material. It is a figure provided in order to demonstrate the relationship between the radiation irradiation amount in the peeling process-less adhesive tape of this invention, and the maintenance factor of the peeling adhesive force with respect to a peeling process less base material.

Explanation of symbols

10: Release treatment-less adhesive tape 12: Removable adhesive layer 14: Release treatment-less base material 16: Primer layer

Claims (8)

A release treatment-less adhesive tape in which a release treatment-less base material and a removable adhesive layer are sequentially laminated,
Re-peelable pressure-sensitive adhesive comprising 30 to 700 parts by weight of an acrylic oligomer and / or plasticizer with respect to 100 parts by weight of an acrylic polymer having a crosslinkable functional group on at least the surface of the re-peelable pressure-sensitive adhesive layer Having a layer,
A peeling treatment-less pressure-sensitive adhesive tape characterized in that an adhesive strength of the re-peelable pressure-sensitive adhesive layer according to JIS-Z-0237 is set to a value within a range of 5 to 400 cN / 19 mm.   The acrylic polymer has a number average molecular weight in the range of 300,000 to 1,500,000, and the acrylic oligomer and / or plasticizer has a number average molecular weight in the range of 200 to 10,000. The release treatment-less pressure-sensitive adhesive tape according to claim 1, wherein   The release treatment-less pressure-sensitive adhesive tape according to claim 1, wherein a primer layer is provided or a corona discharge treatment is performed between one side of the release-treatment-less base material and the removable pressure-sensitive adhesive layer. .   The exfoliation treatment-less adhesive tape according to any one of claims 1 to 3, wherein an embossing treatment is performed on both surfaces or one surface of the exfoliation treatment-less base material.   The thickness of the said releasable adhesive layer shall be the value within the range of 1-300 micrometers, The peeling process-less adhesive tape as described in any one of Claims 1-4 characterized by the above-mentioned.   The release treatment-free pressure-sensitive adhesive tape according to any one of claims 1 to 5, which has been subjected to radiation irradiation sterilization treatment.   The release treatment-less pressure-sensitive adhesive tape according to claim 6, wherein the radiation dose by the radiation irradiation sterilization treatment is set to a value within a range of 1 to 100 kGy. A method for producing a release treatment-less pressure-sensitive adhesive tape in which a release treatment-less base material and a removable adhesive layer are sequentially laminated,
A step of preparing a release-less base material;
As the re-peelable pressure-sensitive adhesive layer, an acrylic oligomer and / or a plasticizer is contained in an amount of 30 to 700 parts by weight with respect to 100 parts by weight of an acrylic polymer having a crosslinkable functional group, and JIS-Z-0237 Forming a releasable pressure-sensitive adhesive layer having a compliant adhesive strength within a range of 5 to 400 cN / 19 mm;
The manufacturing method of the peeling treatment-less adhesive tape characterized by including.

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