Temporary fixing adhesive tape

Abstract

To provide a temporary fixing adhesive tape small in adhesive deposit when peeled, and hard to peel even if an adherend fixed by the temporary fixing adhesive tape is deviated.SOLUTION: A temporary fixing adhesive tape 10 includes a substrate 11, and an adhesive layer 12 provided on one side face of the substrate 11, and further includes an anchor layer 13 between the substrate 11 and the adhesive layer 12, where a tensile fracture elongation in a longitudinal direction of the substrate 11 is 300% or more, the adhesive layer 12 comprises an acrylic adhesive, a gel fraction of the adhesive layer 12 is 20 to 60%, and a thickness of the adhesive layer 12 is 25 to 45 μm.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a temporary fixing pressure-sensitive adhesive tape. [Background technology]

[0002] Adhesive tapes for fixing mats are used in places where a dust-free environment is desired, such as hospitals, electronic component manufacturing factories, and semiconductor manufacturing factories, as well as in large facilities such as public facilities and supermarkets, to remove dust and dirt that adheres to the shoes of people entering and leaving the facility, and to fix dust-proof mats that are used daily to absorb water and provide anti-slip properties. Adhesive tapes for fixing mats are generally required to have high adhesive strength, and one method of improving the adhesive strength of adhesive tapes is to add a tackifier.

[0003] However, adding a large amount of tackifier to improve both adhesive strength and durability significantly reduces tackiness, making the adhesive tape unable to fulfill its function as an adhesive tape. Furthermore, when removing a tape that has been applied to replace a new mat, it is important not only that the adhesive strength be high, but also that no adhesive remain on the dustproof mat after the tape is removed. If adhesive remains on the dustproof mat, the adhesive adhering to the edge of the tape when the tape is removed will adhere to the fabric portion of the dustproof mat when the dustproof mat is washed, resulting in poor appearance and making the dustproof mat unreusable. A known prior art mat-fixing adhesive tape that solves this problem is the mat-fixing adhesive tape described in Patent Document 1, for example.

[0004] The mat-fixing adhesive tape described in Patent Document 1 is an adhesive tape comprising a substrate and an adhesive layer formed on at least one surface of the substrate. The adhesive layer is formed by coating an adhesive composition containing 100 parts by weight of a (meth)acrylic copolymer, 1 to 20 parts by weight of a release agent containing as a tackifying resin a polymeric compound having a long-chain alkyl group bonded thereto as its main component, 0.5 to 15 parts by weight of a polymerized rosin-based tackifying resin as the tackifying resin, and 0.05 to 4.0 parts by weight of a carbodiimide-based compound as a curing agent. The mat-fixing adhesive tape described in Patent Document 1 uses a PET cloth substrate as the substrate. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-65804 Summary of the Invention [Problem to be solved by the invention]

[0006] As mentioned above, it is important that the adhesive tape for fixing a mat does not leave any adhesive on the dustproof mat after the tape is peeled off, i.e., that it leaves little adhesive residue. Also, when people walk on the dustproof mat, the dustproof mat may shift. In this case, it is desirable that the adhesive tape for fixing the mat does not peel off from the dustproof mat even if the dustproof mat shifts slightly.

[0007] Therefore, an object of the present invention is to provide a temporary fixing adhesive tape that leaves little adhesive residue when peeled off and is not easily peeled off even if an adherend fixed by the temporary fixing adhesive tape shifts. [Means for solving the problem]

[0008] The present inventors have conducted extensive research to solve the above-mentioned problems, and as a result have found that the above-mentioned problems can be solved by using a substrate having a predetermined tensile elongation at break, a pressure-sensitive adhesive layer containing a predetermined pressure-sensitive adhesive and having a predetermined gel fraction and thickness, and providing an anchor layer between the substrate and the pressure-sensitive adhesive layer, thereby completing the present invention. The gist of the present invention is as follows.

[0009] [1] A temporary fixing adhesive tape comprising a substrate and an adhesive layer provided on one surface of the substrate, An anchor layer is further provided between the substrate and the pressure-sensitive adhesive layer, The tensile elongation at break of the substrate in the longitudinal direction is 300% or more, the pressure-sensitive adhesive layer is made of an acrylic pressure-sensitive adhesive, the pressure-sensitive adhesive layer has a gel fraction of 20 to 60%, The temporary fixing adhesive tape has an adhesive layer having a thickness of 25 to 45 μm. [2] The acrylic pressure-sensitive adhesive comprises a (meth)acrylic copolymer (A), a polymerized rosin-based tackifying resin as a tackifying resin (B), and at least one compound selected from the group consisting of an aziridine-based compound and an epoxy-based compound as a curing agent (C), the content of the polymerized rosin-based tackifying resin is 0.5 to 15 parts by mass relative to 100 parts by mass of the (meth)acrylic copolymer (A), The temporary fixing pressure-sensitive adhesive tape according to the above [1], wherein the content of the at least one compound selected from the group consisting of aziridine compounds and epoxy compounds is 0.05 to 4.0 parts by mass per 100 parts by mass of the (meth)acrylic copolymer (A). [3] The temporary fixing pressure-sensitive adhesive tape according to the above [1] or [2], wherein the tensile breaking strength in the longitudinal direction of the substrate is 15 N / cm or more. [4] The temporary fixing pressure-sensitive adhesive tape according to any one of the above [1] to [3], wherein the substrate is a uniaxially stretched polyolefin film. [5] The temporary fixing pressure-sensitive adhesive tape according to any one of the above [1] to [4], wherein the substrate is a single layer. [6] The anchor layer contains an amino group-containing acrylic polymer, The temporary fixing adhesive tape according to any one of the above [1] to [5], wherein the content of the amino group-containing acrylic polymer is 0.01 to 4.0 parts by mass per 100 parts by mass of the temporary fixing adhesive tape. [7] The temporary fixing adhesive tape according to any one of the above [1] to [6], which has an SP adhesive strength of 2 to 7 N / cm. [8] The temporary fixing pressure-sensitive adhesive tape according to any one of the above [1] to [7], which is used for application to the surface of rubber, tile, PVC sheet, wood or concrete. [9] The temporary fixing adhesive tape according to any one of the above [1] to [8], which is used to fix a dustproof rubber mat. [Effects of the Invention]

[0010] According to the present invention, it is possible to provide a temporary fixing adhesive tape that leaves little adhesive residue when peeled off and is not easily peeled off even if an adherend fixed by the temporary fixing adhesive tape shifts. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a schematic cross-sectional view showing a temporary fixing pressure-sensitive adhesive tape according to one embodiment of the present invention. [Figure 2] FIG. 2 is a schematic cross-sectional view showing a temporary fixing pressure-sensitive adhesive tape according to another embodiment of the present invention. [Figure 3] FIG. 2 is a schematic cross-sectional view showing a temporary fixing pressure-sensitive adhesive tape according to another embodiment of the present invention. [Figure 4] FIG. 2 is a schematic cross-sectional view showing a temporary fixing pressure-sensitive adhesive tape according to another embodiment of the present invention. [Figure 5] FIG. 1 is a diagram for explaining a method for measuring the shear adhesive strength of a temporary fixing adhesive tape. [Figure 6] FIG. 10 is a diagram for explaining a method for measuring the mat holding power of the temporary fixing adhesive tape. [Figure 7] FIG. 10 is a diagram for explaining a method for measuring the P tile constant load of the temporary fixing adhesive tape. DETAILED DESCRIPTION OF THE INVENTION

[0012] [Temporary adhesive tape] The temporary fixing pressure-sensitive adhesive tape of the present invention comprises a substrate and a pressure-sensitive adhesive layer provided on one surface of the substrate. The tape further comprises an anchor layer between the substrate and the pressure-sensitive adhesive layer. Furthermore, the substrate has a longitudinal tensile elongation at break of 300% or more, the pressure-sensitive adhesive layer is made of an acrylic pressure-sensitive adhesive, the pressure-sensitive adhesive layer has a gel fraction of 20 to 60%, and the pressure-sensitive adhesive layer has a thickness of 25 to 45 μm. The temporary fixing pressure-sensitive adhesive tape is a pressure-sensitive adhesive tape used for the purpose of being attached to an adherend and then peeled off after a certain period of time has elapsed. The temporary fixing pressure-sensitive adhesive tape is also used, for example, to fix an object to be temporarily fixed, such as a mat, to an object to be fixed, such as a floor.

[0013] (base material) <Tensile elongation at break> The tensile breaking elongation in the longitudinal direction of the substrate of the temporary fixing pressure-sensitive adhesive tape of the present invention is 300% or more. If the tensile breaking elongation in the longitudinal direction of the substrate of the temporary fixing pressure-sensitive adhesive tape is less than 300%, even if an object to be temporarily fixed, such as a mat, fixed with the temporary fixing pressure-sensitive adhesive tape is slightly displaced from the object to be fixed, such as a floor, the temporary fixing pressure-sensitive adhesive tape may peel off from the object to be fixed or the object to be temporarily fixed. From this perspective, the tensile breaking elongation in the longitudinal direction of the substrate of the temporary fixing pressure-sensitive adhesive tape of the present invention is preferably 350% or more, more preferably 380% or more, and even more preferably 400% or more. The tensile breaking elongation of the substrate can be measured by the method described in the Examples below. The tensile breaking elongation of the substrate can be adjusted by the type and thickness of the substrate.

[0014] <Tensile breaking strength> The longitudinal tensile breaking strength of the substrate of the temporary fixing pressure-sensitive adhesive tape of the present invention is preferably 15 N / cm or more. If the longitudinal tensile breaking strength of the substrate of the temporary fixing pressure-sensitive adhesive tape is 15 N / cm or more, it is possible to prevent the temporary fixing pressure-sensitive adhesive tape from breaking when an object to be temporarily fixed by the temporary fixing pressure-sensitive adhesive tape is displaced. From this viewpoint, the longitudinal tensile breaking strength of the substrate of the temporary fixing pressure-sensitive adhesive tape of the present invention is more preferably 17 N / cm or more, and even more preferably 19 N / cm or more. The longitudinal tensile breaking strength of the substrate of the temporary fixing pressure-sensitive adhesive tape of the present invention can be measured by the method described in the Examples below. The tensile breaking strength of the substrate can be adjusted by the type and thickness of the substrate.

[0015] <Resin film> The substrate of the temporary fixing pressure-sensitive adhesive tape of the present invention is preferably a resin film. The resin film used as the substrate of the temporary fixing pressure-sensitive adhesive tape of the present invention is not particularly limited as long as it has a tensile elongation at break of 300% or more. The resin film used as the substrate of the temporary fixing pressure-sensitive adhesive tape of the present invention may be a stretched film or a non-stretched film, but from the viewpoint of tensile elongation at break, a stretched film is preferred. Specific examples of resin films include stretched polyolefin films such as stretched polypropylene film, stretched low-density polyethylene film, and stretched high-density polyethylene film, non-stretched polyolefin films such as non-stretched polypropylene film, non-stretched low-density polyethylene film, and non-stretched high-density polyethylene film, stretched polyester film, stretched polyphenylene sulfide film, hard polyvinyl chloride film, soft polyvinyl chloride, cellophane film, acetate film, polystyrene film, polycarbonate film, stretched nylon film, non-stretched nylon film, and polyimide film. Among these, from the viewpoint of tensile elongation at break, stretched polyolefin film is preferred, and stretched polypropylene film is more preferred. The stretched polyolefin film may be uniaxially stretched or biaxially stretched, but uniaxial stretching is preferred. Furthermore, the resin film may be composed of a single resin layer, or may be a multilayer film composed of two or more resin layers. The multilayer film may be a film in which different types of resins are laminated, or a film in which two or more of the same type of resin are laminated. For example, a stretched polypropylene film may be a resin film in which two or more polypropylene layers are laminated. From the viewpoint of tensile elongation at break, the resin film is preferably composed of a single resin layer. In other words, the substrate is preferably a single layer.

[0016] <Thickness> The thickness of the substrate of the temporary fixing pressure-sensitive adhesive tape of the present invention is not particularly limited as long as the tensile elongation at break is 300% or more. From the viewpoint of the tensile elongation at break, the thickness of the substrate of the temporary fixing pressure-sensitive adhesive tape of the present invention is preferably 20 μm or more, more preferably 60 μm or more, and even more preferably 70 μm or more.

[0017] (Adhesive layer) The pressure-sensitive adhesive layer of the temporary fixing pressure-sensitive adhesive tape of the present invention is made of an acrylic pressure-sensitive adhesive. This improves the removability of the temporary fixing pressure-sensitive adhesive tape. The acrylic pressure-sensitive adhesive preferably contains a (meth)acrylic copolymer (A), a polymerized rosin-based tackifying resin as the tackifying resin (B), and at least one compound selected from the group consisting of aziridine compounds and epoxy compounds as the curing agent (C). The pressure-sensitive adhesive is contained in a pressure-sensitive adhesive composition described below, and when diluted with a solvent, it consists of the solid content remaining after removing the solvent from the components constituting the pressure-sensitive adhesive composition. Therefore, the pressure-sensitive adhesive composition also preferably contains a (meth)acrylic copolymer (A), a polymerized rosin-based tackifying resin as the tackifying resin (B), and at least one compound selected from the group consisting of aziridine compounds and epoxy compounds as the curing agent (C).

[0018] <Acrylic adhesive> As will be described below, the pressure-sensitive adhesive layer made of an acrylic pressure-sensitive adhesive is formed from a pressure-sensitive adhesive composition containing at least an acrylic polymer (A), which makes it possible to prevent the pressure-sensitive adhesive of the pressure-sensitive adhesive layer from remaining on the adherend when the temporary fixing pressure-sensitive adhesive tape is peeled off from the adherend after the temporary fixing pressure-sensitive adhesive tape has been attached to the adherend.

[0019] (Acrylic polymer (A)) The acrylic polymer (A) is a polymer obtained by polymerizing monomers including at least an acrylic monomer. The acrylic polymer is preferably a polymer containing a reactive functional group. The reactive functional group is a functional group that is reactive with a crosslinking agent described below. The acrylic polymer (A) may be a copolymer of a monomer containing an alkyl(meth)acrylate (a1) and a functional group-containing monomer (a2) having a reactive functional group, or a copolymer of a monomer containing an alkyl(meth)acrylate (a1), the functional group-containing monomer (a2), and a monomer (a3) ​​other than the alkyl(meth)acrylate (a1) and the functional group-containing monomer (a2). The term "(meth)acrylate" is used to mean either or both of acrylate and methacrylate.

[0020] Examples of the alkyl (meth)acrylate (a1) include methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, n-butyl (meth)acrylate, isobutyl (meth)acrylate, tert-butyl (meth)acrylate, cyclohexyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, n-octyl (meth)acrylate, isooctyl (meth)acrylate, isononyl (meth)acrylate, isomyristyl (meth)acrylate, stearyl (meth)acrylate, isobornyl (meth)acrylate, etc. The alkyl (meth)acrylate (a1) is preferably an alkyl (meth)acrylate having an alkyl group with 1 to 12 carbon atoms, more preferably an alkyl (meth)acrylate having an alkyl group with 4 to 10 carbon atoms, and even more preferably an alkyl acrylate having an alkyl group with 4 to 9 carbon atoms. These alkyl (meth)acrylates (a1) may be used alone or in combination of two or more.

[0021] Among the above, n-butyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, and isononyl (meth)acrylate are preferred as the alkyl (meth)acrylate (a1). By using these alkyl (meth)acrylates, the adhesive layer tends to become flexible, and even if the amount of tackifier resin is reduced, it becomes easier to ensure appropriate adhesiveness. Among these, n-butyl (meth)acrylate and 2-ethylhexyl (meth)acrylate are preferred from the viewpoint of increasing adhesive strength. It is also preferable to use, for example, both n-butyl (meth)acrylate and 2-ethylhexyl (meth)acrylate as the alkyl (meth)acrylate (a1).

[0022] When at least one of n-butyl (meth)acrylate and 2-ethylhexyl (meth)acrylate is used, the total amount used is, for example, 50 to 99.9 mass%, preferably 60 to 99 mass%, and more preferably 70 to 94 mass%, based on the total monomer components used in the acrylic polymer (A).

[0023] The reactive functional group of the functional group-containing monomer (a2) having a reactive functional group is not particularly limited as long as it has active hydrogen and is capable of reacting with the crosslinking agent described below, and examples thereof include a hydroxyl group, an amino group, and a carboxyl group. These functional group-containing monomers (a2) having a reactive functional group may be used alone or in combination of two or more. Among these functional groups, a carboxyl group is preferred. The carboxyl group has high reactivity with the aziridine-based compounds and epoxy-based compounds described below, and can easily form a crosslinked structure.

[0024] The monomer having a hydroxyl group is not particularly limited, but examples thereof include (meth)acrylates having a hydroxyl group such as 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate, 2-hydroxybutyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, 5-hydroxypentyl (meth)acrylate, and 6-hydroxyhexyl (meth)acrylate, allyl alcohol, etc. Among these, (meth)acrylates having a hydroxyl group are preferably used. Examples of the monomer having a carboxy group include methacrylic acid and acrylic acid. These monomers may be used alone or in combination of two or more. Among these, as the functional group-containing monomer (a2) having a reactive functional group, a monomer having a carboxy group is preferred, and acrylic acid is more preferred.

[0025] The other monomer (a3) ​​is not particularly limited as long as it is copolymerizable with the acrylic monomer, and examples thereof include styrene derivatives such as styrene, α-methylstyrene, p-methylstyrene, p-chlorostyrene, and divinylbenzene, compounds having a vinyl ester group such as vinyl acetate and vinyl propionate, N-vinylpyrrolidone, N-vinylmorpholine, (meth)acrylonitrile, N-cyclohexylmaleimide, N-phenylmaleimide, N-laurylmaleimide, N-benzylmaleimide, n-propyl vinyl ether, n-butyl vinyl ether, isobutyl vinyl ether, and tert-butyl vinyl ether. These other monomers (a3) ​​may be used alone or in combination of two or more. Among these, vinyl acetate is preferred as the other monomer (a3).

[0026] The amount of the alkyl (meth)acrylate (a1) used in all the monomer components used in the acrylic polymer (A) is preferably 65% ​​by mass or more, more preferably 75% by mass or more, even more preferably 85% by mass or more, and preferably 99.9% by mass or less, more preferably 99.5% by mass or less, even more preferably 99% by mass or less. The amount of the functional group-containing monomer (a2) having a reactive functional group in the total monomer components used for the acrylic polymer (A) is preferably 0.1 mass% or more, more preferably 0.5 mass% or more, even more preferably 1 mass% or more, and preferably 8 mass% or less, more preferably 6 mass% or less, even more preferably 4 mass% or less. The amount of the other monomer (a3) ​​used in the total monomer components used in the acrylic polymer (A) is preferably 0% by mass or more, more preferably 1% by mass or more, even more preferably 2% by mass or more, and preferably 27% by mass or less, more preferably 20% by mass or less, and even more preferably 15% by mass or less. 0% by mass means that no other monomer (a3) ​​is contained.

[0027] The acrylic polymer (A) can be obtained by polymerizing the above-mentioned monomers by a conventional polymerization method, such as suspension polymerization, emulsion polymerization, or solution polymerization. Among these polymerization methods, solution polymerization is preferred because it is easy to obtain a high molecular weight polymer and does not contain surfactants or dispersants that tend to affect adhesive properties. Furthermore, peroxide-based polymerization initiators, azo-based polymerization initiators, etc. are used as the polymerization initiator.

[0028] The weight-average molecular weight of the acrylic polymer (A) is preferably 300,000 to 800,000, and more preferably 400,000 to 600,000. By setting the weight-average molecular weight within these ranges, it becomes easier to maintain good holding power, adhesive strength, and tackiness of the pressure-sensitive adhesive layer. The weight-average molecular weight is a weight-average molecular weight measured by gel permeation chromatography (GPC) in terms of standard polystyrene.

[0029] In the pressure-sensitive adhesive composition, the acrylic polymer (A) is the main component, and is usually 50% by mass or more, preferably 70% by mass or more, more preferably 80% by mass or more, and usually 100% by mass or less, based on the total amount of the pressure-sensitive adhesive composition (based on solid content).

[0030] (Tackifying resin (B)) The PSA composition preferably contains, in addition to the acrylic polymer (A), a polymerized rosin-based tackifying resin as the tackifying resin (B). Examples of rosin-based tackifying resins include rosin, hydrogenated rosin, heterogenized rosin, polymerized rosin, and esterified products thereof. These rosin-based tackifying resins can be used alone or in combination of two or more. Among these, rosin esters are preferred.

[0031] The content of the polymerized rosin-based tackifying resin is preferably 0.5 to 15 parts by mass per 100 parts by mass of the (meth)acrylic copolymer (A). When the content of the polymerized rosin-based tackifying resin is 0.5 parts by mass or more per 100 parts by mass of the (meth)acrylic copolymer (A), the tackiness and adhesive strength of the temporary fixing pressure-sensitive adhesive tape can be further improved. When the content of the polymerized rosin-based tackifying resin is 15 parts by mass or less per 100 parts by mass of the (meth)acrylic copolymer (A), adhesive residue upon peeling of the temporary fixing pressure-sensitive adhesive tape can be further suppressed. From this perspective, the content of the polymerized rosin-based tackifying resin is more preferably 0.5 to 5 parts by mass, and even more preferably 1 to 2 parts by mass per 100 parts by mass of the (meth)acrylic copolymer (A).

[0032] The PSA composition may further contain, as the tackifier resin (B), a tackifier resin other than a polymerized rosin-based tackifier resin. Examples of tackifier resins other than a polymerized rosin-based tackifier resin include terpene-based tackifier resins and petroleum resin-based tackifier resins. Examples of terpene-based tackifier resins include terpene resins (α,β-pinene), terpene phenol resins, aromatic-modified terpene resins, and hydrogenated terpene resins. Examples of petroleum resin-based tackifier resins include aliphatic petroleum resins, aromatic petroleum resins, copolymerized petroleum resins, and hydrogenated petroleum resins. These tackifier resins may be used alone or in combination of two or more. Terpene-based tackifier resins are preferred, and terpene phenol resins are more preferred.

[0033] The content of the tackifier resin (B) in the pressure-sensitive adhesive composition is preferably 0.5 to 15 parts by mass relative to 100 parts by mass of the acrylic polymer (A). When the content of the tackifier resin (B) is 0.5 parts by mass or more relative to 100 parts by mass of the (meth)acrylic copolymer (A), the tackiness and adhesive strength of the temporary fixing pressure-sensitive adhesive tape can be further improved. When the content of the tackifier resin (B) is preferably 15 parts by mass or less relative to 100 parts by mass of the (meth)acrylic copolymer (A), adhesive residue when the temporary fixing pressure-sensitive adhesive tape is peeled off can be further suppressed. From this viewpoint, the content of the tackifier resin (B) is more preferably 1.0 to 10 parts by mass, and even more preferably 1.0 to 5.0 parts by mass, relative to 100 parts by mass of the (meth)acrylic copolymer (A). In addition, when the PSA composition further contains a tackifier resin other than the polymerized rosin-based tackifier resin as the tackifier resin (B) in addition to the polymerized rosin-based tackifier resin, the content of the tackifier resin (B) is the sum of the content of the polymerized rosin-based tackifier resin and the content of the tackifier resin other than the polymerized rosin-based tackifier resin.

[0034] (Curing agent (C)) The pressure-sensitive adhesive composition preferably contains at least one compound selected from the group consisting of aziridine compounds and epoxy compounds as the curing agent (C), and more preferably contains an aziridine compound as the curing agent (C). Examples of the aziridine compound include N,N'-hexamethylene-1,6-bis(1-aziridinecarboxamide), trimethylolpropane-tri-β-aziridinylpropionate, N,N'-diphenylmethane-4,4'-bis(1-aziridinecarboxamide), and trimethylolpropane-tri-β-(2-methylaziridine)propionate. Examples of epoxy compounds include bisphenol A-epichlorohydrin epoxy resins, ethylene glycol diglycidyl ether, polyethylene glycol diglycidyl ether, glycerin diglycidyl ether, glycerin triglycidyl ether, 1,6-hexanediol diglycidyl ether, trimethylolpropane triglycidyl ether, sorbitol polyglycidyl ether, polyglycerol polyglycidyl ether, pentaerythritol polyglycidyl erythritol, diglycerol polyglycidyl ether, etc. These compounds may be used alone or in combination of two or more.

[0035] The content of at least one compound selected from the group consisting of aziridine compounds and epoxy compounds is preferably 0.05 to 4.0 parts by mass per 100 parts by mass of the (meth)acrylic copolymer (A). When the content of the compound is 0.05 parts by mass or more per 100 parts by mass of the (meth)acrylic copolymer (A), the gel fraction is increased, further suppressing adhesive residue when the temporary fixing pressure-sensitive adhesive tape is peeled off. When the content of the compound is 4.0 parts by mass or less per 100 parts by mass of the (meth)acrylic copolymer (A), an increase in the gel fraction is prevented, further improving the tackiness and adhesive strength of the temporary fixing pressure-sensitive adhesive tape. From this perspective, the content of the compound is more preferably 0.1 to 2 parts by mass, and even more preferably 0.1 to 1 part by mass per 100 parts by mass of the (meth)acrylic copolymer (A).

[0036] The pressure-sensitive adhesive composition may further contain, as the curing agent (C), at least one compound selected from the group consisting of aziridine compounds and epoxy compounds, a curing agent other than aziridine compounds and epoxy compounds. Examples of curing agents other than aziridine compounds and epoxy compounds include isocyanate curing agents, melamine curing agents, aldehyde curing agents, amine curing agents, and metal chelate curing agents. These curing agents may be used alone or in combination of two or more.

[0037] (organic solvent) The pressure-sensitive adhesive composition may contain an organic solvent. The organic solvent may be the solvent used when synthesizing the acrylic polymer, or may be added after synthesizing the acrylic polymer. Examples of organic solvents include esters such as ethyl acetate and butyl acetate, aromatic compounds such as toluene, aliphatic hydrocarbons such as hexane, and alcohols such as methanol, ethanol, and isopropyl alcohol, with ethyl acetate being preferred. These organic solvents may be used alone or in combination of two or more.

[0038] (Other ingredients) The pressure-sensitive adhesive composition of the present invention may further contain a filler, an antioxidant, an ultraviolet protection agent, a plasticizer, a viscosity adjuster, etc., within the range that does not impair the effects of the present invention.

[0039] <Gel fraction> The pressure-sensitive adhesive layer has a gel fraction of 20 to 60%. If the gel fraction of the pressure-sensitive adhesive layer is less than 20%, adhesive residue may be left when the temporary fixing adhesive tape is peeled off. If the gel fraction of the pressure-sensitive adhesive layer is less than 20%, the removability of the temporary fixing adhesive tape may be poor. If the gel fraction of the pressure-sensitive adhesive layer is less than 20%, the temporary fixing adhesive tape may peel off immediately when an adherend fixed by the temporary fixing adhesive tape shifts. On the other hand, if the gel fraction of the pressure-sensitive adhesive layer is greater than 60%, the tackiness and adhesive strength of the temporary fixing adhesive tape may be insufficient. If the gel fraction of the pressure-sensitive adhesive layer is greater than 60%, the dust-proof rubber mat may easily shift when the temporary fixing adhesive tape is used to fix the dust-proof rubber mat. If the gel fraction of the pressure-sensitive adhesive layer is greater than 60%, the temporary fixing adhesive tape may peel off immediately when an adherend fixed by the temporary fixing adhesive tape shifts. From these viewpoints, the gel fraction of the pressure-sensitive adhesive layer is preferably 25 to 50%, and more preferably 30 to 45%. The gel fraction of the pressure-sensitive adhesive layer can be measured by the method described in the Examples below, and can be adjusted by the gel fraction of the pressure-sensitive adhesive layer and the type and amount of curing agent.

[0040] <Thickness> The thickness of the adhesive layer is 25 to 45 μm. If the thickness of the adhesive layer is less than 25 μm, the tackiness or adhesive strength of the temporary fixing adhesive tape may be insufficient. Furthermore, if the thickness of the adhesive layer is less than 25 μm, when the temporary fixing adhesive tape is used to fix a dustproof rubber mat, the dustproof rubber mat may easily slip. Furthermore, if the thickness of the adhesive layer is less than 25 μm, the temporary fixing adhesive tape may immediately peel off when an adherend fixed by the temporary fixing adhesive tape slips. On the other hand, if the thickness of the adhesive layer is greater than 45 μm, adhesive residue may be left when the temporary fixing adhesive tape is peeled off. Furthermore, if the thickness of the adhesive layer is greater than 45 μm, the removability of the temporary fixing adhesive tape may be poor. Furthermore, if the thickness of the adhesive layer is greater than 45 μm, the temporary fixing adhesive tape may immediately peel off when an adherend fixed by the temporary fixing adhesive tape slips. From this viewpoint, the thickness of the pressure-sensitive adhesive layer is preferably 30 to 45 μm, and more preferably 35 to 45 μm.

[0041] (Anchor layer) The temporary fixing pressure-sensitive adhesive tape of the present invention further comprises an anchor layer between the substrate and the pressure-sensitive adhesive layer. If the temporary fixing pressure-sensitive adhesive tape does not comprise an anchor layer between the substrate and the pressure-sensitive adhesive layer, the adhesiveness of the pressure-sensitive adhesive layer to the substrate may decrease, resulting in a large amount of adhesive residue when the temporary fixing pressure-sensitive adhesive tape is peeled off. Furthermore, by further comprising an anchor layer between the substrate and the pressure-sensitive adhesive layer, the temporary fixing pressure-sensitive adhesive tape of the present invention can strengthen the bond between the substrate and the pressure-sensitive adhesive layer. Examples of polymers constituting the anchor layer include amino group-containing acrylic polymers, polyethyleneimine, polyurethane aqueous dispersions, isocyanate-based compounds, modified polybutadiene, and organic titanate-based compounds. The amino group-containing acrylic polymer is preferably an aminoethylated acrylic polymer. The aminoethylated acrylic polymer is a primary amino group-containing acrylic polymer with polyethyleneimine grafted to the side chain. Commercially available aminoethylated acrylic polymers include "Polyment NK-350" manufactured by Nippon Shokubai Co., Ltd. Polyethyleneimine is a water-soluble polymer obtained by polymerizing ethyleneimine. Commercially available polyethyleneimine products include "Epomin P-1000" and "Epomin P-3000" manufactured by Nippon Shokubai Co., Ltd. Polyurethane aqueous dispersions are self-dispersible polyurethanes obtained by adding a small amount of hydrophilic groups or hydrophilic segments to urethane resins, or hydrophobic urethane resins forcibly emulsified with a surfactant. Commercially available polyurethane aqueous dispersions include "Superflex Series" manufactured by Daiichi Kogyo Seiyaku Co., Ltd. From the viewpoint of the interfacial strength between the substrate and the pressure-sensitive adhesive layer, among these polymers, amino group-containing acrylic polymers are preferred, and aminoethylated acrylic polymers are more preferred. The anchor layer can be formed by applying a primer coating containing the above polymer to the substrate and drying it as necessary.

[0042] The content of the amino group-containing acrylic polymer is preferably 0.01 to 4.0 parts by mass relative to 100 parts by mass of the temporary fixing pressure-sensitive adhesive tape. When the content of the amino group-containing acrylic polymer is 0.01 to 4.0 parts by mass relative to 100 parts by mass of the temporary fixing pressure-sensitive adhesive tape, adhesive residue when the temporary fixing pressure-sensitive adhesive tape is peeled off can be further reduced. From this viewpoint, the content of the amino group-containing acrylic polymer is more preferably 0.1 to 3.0 parts by mass, and even more preferably 1 to 2 parts by mass relative to 100 parts by mass of the temporary fixing pressure-sensitive adhesive tape.

[0043] <Thickness> The thickness of the anchor layer is preferably 0.01 to 5 μm. When the thickness of the anchor layer is 0.01 to 5 μm, adhesive residue when the fixing adhesive tape is peeled off can be further reduced. From this viewpoint, the thickness of the anchor layer is more preferably 0.01 to 2 μm, and even more preferably 0.01 to 1 μm.

[0044] <Layer structure of temporary adhesive tape> Hereinafter, a temporary fixing pressure-sensitive adhesive tape according to an embodiment of the present invention will be described with reference to the drawings, but the temporary fixing pressure-sensitive adhesive tape of the present invention is not limited to the contents of the drawings. As shown in FIG. 1, a temporary fixing adhesive tape 10 according to one embodiment of the present invention comprises a substrate 11, an adhesive layer 12 provided on one side of the substrate 11, and an anchor layer 13 provided between the substrate 11 and the adhesive layer 12. The temporary fixing pressure-sensitive adhesive tape preferably further comprises a release agent layer, and specifically, as shown in Fig. 2, it is preferable to comprise a release agent layer 14 on the surface of the substrate 11 opposite to the pressure-sensitive adhesive layer side. That is, the temporary fixing pressure-sensitive adhesive tape 10 is preferably a tape in which the pressure-sensitive adhesive layer 12, anchor layer 13, substrate 11, and release agent layer 14 are laminated in this order. By providing the release agent layer 14, when the temporary fixing adhesive tape is wound into a roll to form a rolled body, the adhesive layer 12 comes into contact with the release agent layer 14. Therefore, it becomes possible to easily unwind the temporary fixing adhesive tape 10 from the rolled body.

[0045] <Release agent layer> The release agent layer 14 may be formed from a known release agent such as a silicone-based release agent or a long-chain alkyl-based release agent. The thickness of the release agent layer is not particularly limited, but the amount of adhesion is, for example, 0.1 g / m 2 More than 10g / m 2 or less, preferably 0.3 g / m 2 More than 5g / m 2 The amount may be adjusted to the following extent.

[0046] The temporary fixing pressure-sensitive adhesive tape may further include a printed layer, and specifically, as shown in Fig. 3, may include a printed layer 15 between the substrate 11 and the anchor layer 13. That is, the temporary fixing pressure-sensitive adhesive tape 10 may be a tape in which the pressure-sensitive adhesive layer 12, the anchor layer 13, the printed layer 15, and the substrate 11 are laminated in this order.

[0047] <Print layer> The printed layer 15 can be formed by printing on one surface of the substrate 11. Known methods such as inkjet printing, screen printing, and gravure printing can be used as appropriate to form the printed layer 15. The printed layer 15 may display, for example, a logo, a pattern, an icon, or the like.

[0048] As shown in FIG. 4, the temporary fixing adhesive tape 10 may be a tape in which an adhesive layer 12, an anchor layer 13, a printing layer 15, a substrate 11, and a release agent layer 14 are laminated in this order.

[0049] <Application> The use of the temporary fixing pressure-sensitive adhesive tape of the present invention is not particularly limited, but it is suitably used in applications that require application and peeling, and is preferably used, for example, for curing or temporary fixing of various adherends. It is also preferably used for applications in which it is attached to the surface of an adherend such as rubber, tile, PVC sheet, wood, or concrete, and is particularly preferably used for applications in which these are used as adherends and the object to be temporarily fixed is fixed to the object with the temporary fixing pressure-sensitive adhesive tape. In particular, the temporary fixing pressure-sensitive adhesive tape of the present invention leaves little adhesive residue when peeled off, and is not easily peeled off even if the object to be temporarily fixed fixed with the temporary fixing pressure-sensitive adhesive tape is displaced, so it is preferably used for fixing rubber mats such as dustproof rubber mats.

[0050] [Method of manufacturing temporary adhesive tape] The method for producing the temporary fixing pressure-sensitive adhesive tape of the present invention is not particularly limited, but preferably includes a step of forming an anchor layer on the surface of a substrate, and then applying a pressure-sensitive adhesive composition onto the anchor layer formed on the surface of the substrate. The method for applying the pressure-sensitive adhesive composition onto the anchor layer formed on the substrate is not particularly limited, and conventionally known methods such as using a spin coater or a doctor knife can be used.

[0051] The composition of the pressure-sensitive adhesive composition is as described above, and the solid content concentration of the pressure-sensitive adhesive composition is preferably 20 to 70 mass %, more preferably 30 to 60 mass %.

[0052] The coating amount of the adhesive composition is 10 to 300 g / m 2 It is preferable that the density is 30 to 200 g / m 2 More preferably, it is 50 to 150 g / m 2 It is more preferable that: After the step of applying the adhesive composition onto the anchor layer formed on the surface of the substrate, it is preferable to dry the composition to form an adhesive layer. The temperature and time for drying may be appropriately set depending on the evaporation temperature of the solvent contained in the adhesive composition. The drying temperature is, for example, 50 to 150°C, preferably 70 to 105°C, and more preferably 80 to 100°C. The drying time may be in the range of 10 seconds to 3 minutes. In this way, a temporary fixing adhesive tape is obtained which comprises a substrate, an adhesive layer provided on one surface of the substrate, and an anchor layer provided between the substrate and the adhesive layer. However, the manufacturing method of the temporary fixing pressure-sensitive adhesive tape is not limited to the above, and the temporary fixing pressure-sensitive adhesive tape may be manufactured by transferring a pressure-sensitive adhesive layer previously formed on a transfer sheet onto an anchor layer formed on a substrate, thereby laminating the pressure-sensitive adhesive layer on the anchor layer formed on the substrate. The method of forming the pressure-sensitive adhesive layer on the transfer sheet can be performed in the same manner as when forming the pressure-sensitive adhesive layer on the surface of the substrate. Furthermore, when the temporary fixing adhesive tape has a release agent layer, the adhesive layer may be formed on the anchor layer of a substrate having a release agent layer formed on one side and an anchor layer formed on the other side. [Example]

[0053] The present invention will be explained in more detail by way of examples, but the present invention is not limited to these examples in any way.

[0054] The measurement and evaluation methods are as follows. <Tensile elongation and strength at break of substrate> The breaking strength of the substrates used in producing the temporary fixing pressure-sensitive adhesive tapes of the Examples and Comparative Examples was measured by the following method. A tensile tester (manufactured by A&D Co., Ltd., product name "Tensilon Universal Material Testing Machine") was used to perform a tensile test under conditions of a measurement temperature of 23°C, humidity of 50% RH, and a test speed of 300 mm / min. A test sample was 24 mm wide and 150 mm long, and both ends of the test sample were chucked into the tester and pulled vertically to measure the elongation and strength at break. The elongation and strength at break were then taken as the tensile breaking elongation and tensile breaking strength of the substrate, respectively.

[0055] <Gel fraction of adhesive layer> A test piece of the adhesive layer was collected, and the mass A (mg) of the test piece was precisely weighed. Next, toluene was added to this test piece so that the adhesive solids concentration became 6% by mass. The test piece was immersed in toluene and shaken for 24 hours, and then filtered through a 200-mesh wire net. The insoluble matter on the wire net was collected and vacuum-dried, and the mass B (mg) of the insoluble matter was precisely weighed. From the obtained value, the gel fraction (% by mass) was calculated using the following formula. Gel fraction (mass%) = 100 × (B / A)

[0056] <Shear adhesive strength of temporary fixing adhesive tape> A 24 mm wide x 24 mm long region of the edge of a temporary fixing adhesive tape cut to a width of 24 mm x length of 49 mm was bonded to a rubber plate (manufactured by Wake Sangyo Co., Ltd., product name "Natural Rubber Roll, Black"), and the bonded area was bonded by rolling a 2 kg pressure roller back and forth twice in an environment of 23°C. The bonded area was then left at 23°C for at least 20 minutes. As shown in Figure 5, the edge of the temporary fixing adhesive tape 10 opposite the edge attached to the rubber plate 20 was pulled in the shear direction at a pulling rate of 50 mm / min using a tensile tester (manufactured by A&D Co., Ltd., product name "Tensilon Universal Testing Machine") in an environment of 23°C and 50% RH, thereby measuring the peel force and peel elongation when the temporary fixing adhesive tape 10 was peeled from the rubber plate 20. The distance between the chuck 30 of the tensile tester and the rubber plate 20 was 25 mm.

[0057] <Mat holding power of temporary adhesive tape> A 24 mm wide x 24 mm long area of ​​the edge of a temporary fixing adhesive tape cut to a width of 24 mm x length of 30 mm was attached to a rubber plate (manufactured by Wake Sangyo Co., Ltd., product name "Natural Rubber Roll, Black"), and the tape was bonded by rolling a 2 kg pressure roller back and forth twice in an environment of 23°C. The tape was then left at 23°C for at least 20 minutes. As shown in Figure 6, a weight 40 was attached to the end of the temporary fixing adhesive tape 10 opposite the end attached to the rubber plate 20 in an environment of 23°C and 50% RH. The tape was pulled in the shear direction with a load of 1 kg, and the time until the temporary fixing adhesive tape 10 peeled from the rubber plate 20 and the weight 40 fell was measured up to 200 minutes. The distance between the chuck 30 of the tensile tester and the rubber plate 20 was 25 mm.

[0058] <Temporary fixing adhesive tape for P tiles with constant load> A P tile (trade name "P Tile", manufactured by Tajima Roofing Co., Ltd.) was attached to a 24 mm wide x 24 mm long region of the end of a temporary fixing adhesive tape cut to a width of 24 mm x a length of 150 mm or more, and the tape was bonded by moving a 2 kg pressure roller back and forth twice in an environment of 40°C, and then left to stand at 40°C for 20 minutes or more. As shown in Figure 7, the P tile 50 was tilted 30° from the horizontal, and then a weight 40 was attached to the end of the temporary fixing adhesive tape 10 opposite the end attached to the P tile 50, and the tape was pulled vertically for 8 hours with a load of 100 g, and the length of the temporary fixing adhesive tape 10 that had peeled off from the P tile was measured.

[0059] <SP adhesive strength of temporary adhesive tape> The adhesive layer side was attached to a polished SUS plate so that the adhesion area was 24 mm × 200 mm, and the plate was left to stand for 30 minutes at 23°C and 50% RH. After that, a 2 kg load was applied at 23°C, and the displacement after 24 hours was measured according to the SP adhesive strength measurement method of JIS Z 0237 after applying a 1 kg load.

[0060] <Adhesive residue from temporary adhesive tape over time> The test sample was 24 mm wide and 150 mm or longer, and attached to a rubber plate (manufactured by Wake Sangyo Co., Ltd., product name "Natural Rubber Roll Black") and pressed down by hand. The sample was left in an open air at 60°C with a load of 20 kg applied for 4 days, and then the test sample was peeled off from the rubber plate by hand in a 0°C environment, and the presence or absence of adhesive residue on the surface of the rubber plate was confirmed by visual and tactile inspection. (Evaluation criteria) 5: No adhesive residue. 4: There are small spots of adhesive residue. 3 20-30% adhesive remains. 2. 30-70% of adhesive remains. 1. 80% to 100% adhesive remains.

[0061] [Components of Pressure-Sensitive Adhesive Composition] (Monomers used in producing acrylic polymer (A)) Butyl acrylate (BA) 2-Ethylhexyl acrylate (2EHA) Acrylic acid (AAc) Vinyl acetate

[0062] (Tackifying resin (B)) Rosin ester: Arakawa Chemical Industries, Ltd. "Pensel D-135, Superester A125"

[0063] (Curing agent (C)) Aziridine compound: "ChemiTite PZ-33" manufactured by Nippon Shokubai Co., Ltd. Epoxy compound: "TETRAD-C" manufactured by Mitsubishi Gas Chemical Company, Inc.

[0064] [Base material] OPP: Uniaxially oriented polyolefin film, manufactured by Toyobo Co., Ltd., product name "P4748", thickness: 70 μm PET cloth: Marui Textile Co., Ltd., product name "Airtight waterproof tape #740", thickness: 95 μm

[0065] Anchor layer A: Amino group-containing acrylic polymer, manufactured by Nippon Shokubai Co., Ltd., product name "Polyment NK350" B: Acrylic modified rubber, manufactured by Koshigaya Rubber Industry Co., Ltd., product name "MG30"

[0066] [Preparation of Pressure-Sensitive Adhesive Composition A] A reactor equipped with a thermometer, stirrer, condenser, and dropping funnel was prepared. In the reactor, a monomer mixture consisting of 77 parts by mass of butyl acrylate, 15 parts by mass of 2-ethylhexyl acrylate, and 1.5 parts by mass of acrylic acid was dissolved in ethyl acetate, and the mixture was reacted for 10 hours at below the boiling point using 0.3 parts by mass of lauroyl peroxide as a polymerization initiator to obtain an acrylic polymer solution. After cooling the solution obtained in this manner, 600 parts by mass of methanol was added to precipitate the polymer, and the supernatant was separated and removed. An additional 300 parts by mass of methanol was added, and the supernatant was separated and removed. The acrylic polymer was then redissolved in ethyl acetate to prepare an acrylic polymer solution. Next, a tackifier resin and a curing agent were blended into the acrylic polymer solution in the amounts shown in Table 1, thereby obtaining a pressure-sensitive adhesive composition A.

[0067] [Preparation of Pressure-Sensitive Adhesive Compositions B to E] An acrylic polymer solution was prepared in the same manner as in Example 1, except that the type and amount of each monomer used to obtain the acrylic polymer were changed as shown in Table 1. Next, a tackifying resin and a curing agent were added to the acrylic polymer solution in the amounts shown in Table 1 and mixed to obtain pressure-sensitive adhesive compositions B to E.

[0068] [Table 1]

[0069] [Example 1] An amino group-containing acrylic polymer was coated on one surface of the OPP film so that the thickness after drying would be 0.01 μm, and then dried at 90°C for 2 minutes to form an anchor layer on one surface of the OPP film. Next, pressure-sensitive adhesive composition A was applied onto the anchor layer of the OPP film so that the thickness after drying would be 35 μm, and then dried at 90° C. for 2 minutes to form a pressure-sensitive adhesive layer, thereby obtaining a temporary fixing pressure-sensitive adhesive tape. Various evaluations were performed using this temporary fixing pressure-sensitive adhesive tape, and the results are shown in Table 2.

[0070] [Examples 2 to 11, Comparative Examples 1 to 9] Temporary fixing pressure-sensitive adhesive tapes were obtained in the same manner as in Example 1, except that the types of the pressure-sensitive adhesive compositions, the types of the substrates, and the types of the anchor layers were changed as shown in Tables 2 and 3. Various evaluations were carried out using the temporary fixing pressure-sensitive adhesive tapes, and the results are shown in Tables 2 and 3.

[0071] [Table 2]

[0072] [Table 3]

[0073] The temporary fixing pressure-sensitive adhesive tapes of Examples 1 to 11 had an anchor layer between the substrate and the pressure-sensitive adhesive layer, the tensile elongation at break in the longitudinal direction of the substrate was 300% or more, the pressure-sensitive adhesive layer was made of an acrylic pressure-sensitive adhesive, the gel fraction of the pressure-sensitive adhesive layer was 20 to 60%, and the thickness of the pressure-sensitive adhesive layer was 25 to 45 μm. Therefore, the temporary fixing pressure-sensitive adhesive tapes of Examples 1 to 11 left little adhesive residue over time and showed large displacement upon peeling. This demonstrates that the temporary fixing pressure-sensitive adhesive tapes of Examples 1 to 11 are temporary fixing pressure-sensitive adhesive tapes that leave little adhesive residue when peeled, and provide temporary fixing pressure-sensitive adhesive tapes that are difficult to peel off even if an adherend fixed by the temporary fixing pressure-sensitive adhesive tape shifts. The temporary fixing pressure-sensitive adhesive tape of Comparative Example 1 did not have an anchor layer between the substrate and the pressure-sensitive adhesive layer, and therefore left a large amount of adhesive residue when peeled off. The temporary fixing pressure-sensitive adhesive tape of Comparative Example 2 had a tensile breaking elongation in the longitudinal direction of the substrate of less than 300%, and therefore had a small displacement upon peeling. This indicates that the temporary fixing pressure-sensitive adhesive tape of Comparative Example 2 is a temporary fixing pressure-sensitive adhesive tape that quickly peels off when the adherend fixed by the temporary fixing pressure-sensitive adhesive tape shifts. The temporary fixing pressure-sensitive adhesive tape of Comparative Example 3 had a gel fraction of less than 20% in the pressure-sensitive adhesive layer, and therefore left much adhesive residue over time and exhibited little displacement upon peeling. This demonstrates that the temporary fixing pressure-sensitive adhesive tape of Comparative Example 3 leaves much adhesive residue when peeled off, and is a temporary fixing pressure-sensitive adhesive tape that quickly peels off if the adherend fixed by the temporary fixing pressure-sensitive adhesive tape shifts. The temporary fixing pressure-sensitive adhesive tape of Comparative Example 4 had a gel fraction of more than 60% in the pressure-sensitive adhesive layer, and therefore showed small displacement upon peeling. This indicates that the temporary fixing pressure-sensitive adhesive tape of Comparative Example 4 is a temporary fixing pressure-sensitive adhesive tape that quickly peels off when the adherend fixed by the temporary fixing pressure-sensitive adhesive tape shifts. The temporary fixing pressure-sensitive adhesive tapes of Comparative Examples 5, 6, and 8 had pressure-sensitive adhesive layer thicknesses of less than 25 μm, and therefore showed small displacement upon peeling. This indicates that the temporary fixing pressure-sensitive adhesive tapes of Comparative Examples 5, 6, and 8 are temporary fixing pressure-sensitive adhesive tapes that immediately peel off when the adherend fixed by the temporary fixing pressure-sensitive adhesive tape shifts. The temporary fixing pressure-sensitive adhesive tapes of Comparative Examples 7 and 9 had pressure-sensitive adhesive layer thicknesses greater than 45 μm, and therefore showed small displacement upon peeling. This indicates that the temporary fixing pressure-sensitive adhesive tapes of Comparative Examples 7 and 9 are temporary fixing pressure-sensitive adhesive tapes that immediately peel off when the adherend fixed by the temporary fixing pressure-sensitive adhesive tape shifts. [Explanation of symbols]

[0074] 10 Temporary adhesive tape 11 Base material 12 Adhesive layer 13 Anchor Layer 14 Release agent layer 15 Printing layer 20 Rubber Plate 30 Chuck 40 weights 50 P tile

Claims

1. A temporary fixing adhesive tape comprising a substrate and an adhesive layer provided on one surface of the substrate, An anchor layer is further provided between the substrate and the pressure-sensitive adhesive layer, The tensile elongation at break of the substrate in the longitudinal direction is 300% or more, the pressure-sensitive adhesive layer is made of an acrylic pressure-sensitive adhesive, the pressure-sensitive adhesive layer has a gel fraction of 20 to 60%, The temporary fixing adhesive tape has a thickness of the adhesive layer of 25 to 45 μm.

2. the acrylic pressure-sensitive adhesive comprises a (meth)acrylic copolymer (A), a polymerized rosin-based tackifying resin as a tackifying resin (B), and at least one compound selected from the group consisting of an aziridine-based compound and an epoxy-based compound as a curing agent (C); the content of the polymerized rosin-based tackifying resin is 0.5 to 15 parts by mass per 100 parts by mass of the (meth)acrylic copolymer (A), The temporary fixing pressure-sensitive adhesive tape according to claim 1, wherein the content of the at least one compound selected from the group consisting of an aziridine-based compound and an epoxy-based compound is 0.05 to 4.0 parts by mass per 100 parts by mass of the (meth)acrylic copolymer (A).

3. The temporary fixing pressure-sensitive adhesive tape according to claim 1, wherein the substrate has a tensile breaking strength in the longitudinal direction of 15 N / cm or more.

4. The temporary fixing pressure-sensitive adhesive tape according to claim 1, wherein the substrate is a uniaxially oriented polyolefin film.

5. The temporary fixing pressure-sensitive adhesive tape according to claim 1 , wherein the substrate is a single layer.

6. the anchor layer comprises an amino group-containing acrylic polymer, The temporary fixing pressure-sensitive adhesive tape according to claim 1, wherein the content of the amino group-containing acrylic polymer is 0.01 to 4.0 parts by mass relative to 100 parts by mass of the temporary fixing pressure-sensitive adhesive tape.

7. The temporary fixing adhesive tape according to claim 1, wherein the SP adhesive strength is 2 to 7 N / cm.

8. The temporary fixing pressure-sensitive adhesive tape according to any one of claims 1 to 7, which is used for application to be attached to the surface of rubber, tile, PVC sheet, wood or concrete.

9. The temporary fixing pressure-sensitive adhesive tape according to any one of claims 1 to 7, which is used to fix a dustproof rubber mat.

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