JP2017200977A - Rubber adhesive tape - Google Patents

Abstract

An object of the present invention is to provide a rubber-based adhesive tape in which generation of static electricity is suppressed. A rubber-based pressure-sensitive adhesive tape (10) according to the present invention is a film-shaped polyvinyl chloride-based substrate (11) and a rubber-based pressure-sensitive adhesive disposed on one surface of the polyvinyl chloride-based substrate (11) and containing a rubber component as a main component. The rubber-based pressure-sensitive adhesive layer 12 has a high relative dielectric constant rubber component having a relative dielectric constant of 4.0 or more as a rubber component, and contains a high relative dielectric constant rubber component in the rubber component. The ratio (% by mass) is 3 to 100% by mass. [Selection diagram] Fig. 1

Description

  The present invention relates to a rubber-based adhesive tape.

  In order to temporarily protect the surface of the metal plate, an adhesive tape is used (for example, Patent Document 1). This type of adhesive tape is attached so as to cover the surface of the metal plate so that the metal plate is not damaged when the metal plate is processed or stored. Then, the adhesive tape is finally peeled from the metal plate.

  By the way, when the metal plate is bent, the metal plate is processed together with the adhesive tape in a state of being covered with the adhesive tape. For this reason, this type of pressure-sensitive adhesive tape is particularly required to have a follow-up property (dynamic follow-up property) that keeps in close contact with the surface shape even when the surface shape of the metal plate changes.

  Under such circumstances, as shown in Patent Document 1, polyvinyl chloride having excellent flexibility and stretchability is used as a film base material for an adhesive tape. Moreover, the rubber adhesive which is excellent in a softness | flexibility etc. is used as an adhesive layer of an adhesive tape.

Japanese Patent Laid-Open No. 2015-20405

  With rubber adhesive tapes that use polyvinyl chloride as the film base and rubber adhesives as the adhesive layer, static electricity is likely to occur when the tape is unwound around the roller. There was a problem. Therefore, when an operator touches a rubber-based adhesive tape charged with static electricity, electrostatic discharge occurs between the operator and the rubber-based adhesive tape, and the operator may feel uncomfortable. In addition, if the rubber-based adhesive tape is charged with static electricity, foreign matters such as dust are attracted by the static electricity and mixed between the adhesive layer of the rubber-based adhesive tape and the adherend (metal plate, etc.). was there.

  Note that an antistatic agent may be added to the adhesive layer or the like in order to suppress static electricity of the adhesive tape. However, in order to suppress static electricity of the adhesive tape, considering that the antistatic agent moves from the adhesive layer side to the film substrate side, a large amount of antistatic agent is usually added to the adhesive layer etc. Must be added in advance. As a result, the adhesive property of the pressure-sensitive adhesive layer is changed by the antistatic agent added in a large amount, and the adhesive force may be reduced. If a large amount of antistatic agent is added, the antistatic agent or the like oozes out from the surface of the pressure-sensitive adhesive layer, and the oozed antistatic agent or the like moves from the pressure-sensitive adhesive layer to the adherend surface. The adherend surface may be contaminated.

  An object of the present invention is to provide a rubber-based adhesive tape in which the generation of static electricity is suppressed.

  As a result of intensive studies to achieve the above object, the present inventors have arranged a film-like polyvinyl chloride base material on one side of the polyvinyl chloride base material, and include a rubber component as a main component. A rubber-based pressure-sensitive adhesive layer, and the rubber-based pressure-sensitive adhesive layer includes, as the rubber component, a high relative dielectric constant rubber component having a relative dielectric constant of 4.0 or more, and the high ratio in the rubber component The rubber-based adhesive tape having a dielectric constant rubber component content (mass%) of 3 to 100 mass% was found to suppress the generation of static electricity, and the present invention was completed.

  In the rubber-based adhesive tape, the rubber-based adhesive layer may have a thickness of 1 μm to 50 μm.

  In the rubber adhesive tape, the maximum elongation of the polyvinyl chloride base material measured according to JIS-K-7127 may be 100% or more.

  In the rubber adhesive tape, the polyvinyl chloride base material may have a thickness of 20 μm to 200 μm.

  In the rubber adhesive tape, an undercoat layer may be provided between the polyvinyl chloride base material and the rubber adhesive layer.

  In the rubber-based pressure-sensitive adhesive tape, the rubber-based pressure-sensitive adhesive layer may have a peeling force in a 0 ° C. environment of 0.20 N / 20 mm or more.

  In the rubber-based adhesive tape, the content of all rubber components in the rubber-based adhesive layer may be 50% by mass or more.

  The rubber-based adhesive tape may be used for metal plate processing.

  In the rubber-based adhesive tape, the rubber-based adhesive layer may include a low relative dielectric constant rubber component having a relative dielectric constant of less than 4.0 as a rubber component.

  ADVANTAGE OF THE INVENTION According to this invention, the rubber-type adhesive tape in which generation | occurrence | production of static electricity was suppressed can be provided.

Explanatory drawing schematically showing an example of rubber adhesive tape Explanatory drawing schematically showing another example of rubber adhesive tape Explanatory drawing schematically showing the method of measuring the charging potential when the tape is fed

[Rubber adhesive tape]
The rubber-based pressure-sensitive adhesive tape according to this embodiment includes a film-like polyvinyl chloride base material and a rubber-based pressure-sensitive adhesive layer (hereinafter referred to as a pressure-sensitive adhesive layer) disposed on one side of the polyvinyl chloride-based base material. ).

  FIG. 1 is an explanatory view schematically showing an example of a rubber-based adhesive tape 10. As shown in FIG. 1, the rubber-based adhesive tape 10 includes a polyvinyl chloride-based substrate 11 and a rubber-based adhesive layer 12.

  In general, the term “adhesive tape” may be referred to by a name different from “adhesive sheet”, “adhesive film”, etc., but in this specification, the expression is unified as “adhesive tape”. Further, the surface of the pressure-sensitive adhesive layer in the pressure-sensitive adhesive tape may be referred to as “pressure-sensitive adhesive surface”.

(Polyvinyl chloride base material)
A polyvinyl chloride base material (hereinafter sometimes referred to as “PVC base material”) is a base material containing polyvinyl chloride as a main component. The PVC-based substrate may have a single layer structure or a laminated (multilayer) structure.

  The content ratio of polyvinyl chloride in the PVC-based substrate is not particularly limited, but is preferably 60% by mass or more, and more preferably 65% by mass or more, with respect to the total mass (100% by mass) of the PVC-based substrate. 70 mass% or more is more preferable. The upper limit of the content of polyvinyl chloride is not particularly limited, but is preferably 90% by mass or less, more preferably 85% by mass or less, and still more preferably 80% by mass or less. When the content ratio of polyvinyl chloride in the PVC base material is within such a range, the rigidity of the PVC base material is ensured, and the stress relaxation property of the PVC base material is excellent. Moreover, when the content ratio of polyvinyl chloride in the PVC base material is in such a range, a plasticizer or the like can be added to the PVC base material, and the softness and solvent resistance of the base material can be added. Etc. can be adjusted.

  As the polyvinyl chloride, soft polyvinyl chloride (for example, polyvinyl chloride having a polymerization degree of 1500 or less) is preferable. Although the polymerization degree (average polymerization degree) of the said polyvinyl chloride is not specifically limited, For example, 500-1300 are preferable, More preferably, it is 900-1300. When the degree of polymerization is in the above range, the flexibility of the PVC-based substrate is ensured. The degree of polymerization of polyvinyl chloride can be adjusted by, for example, the content of vinyl chloride at the time of polymerization.

  In the present specification, the degree of polymerization means that measured in accordance with JIS K 6721 (1977). Specifically, for example, it can be measured by the following average polymerization degree measuring method.

[Measurement method of average degree of polymerization]
Using polyvinyl chloride to be measured as a sample, weigh out 200 ± 1 mg of a sample dried in advance at room temperature in a desiccator, transfer to a volumetric flask, add about 40 ml of nitrobenzene, and heat to about 100 ° C. When the sample is completely dissolved in appearance, it is cooled, and nitrobenzene is further added to make a total volume of 50 ml at 30 ± 0.05 ° C. This is used as a test solution. Using the test solution, the relative viscosity (η _re1 ) and specific viscosity (η _sp ) are measured with a _Ubbelohde viscometer. Then, the intrinsic viscosity ([η]) is obtained by the following formula (1), and the average degree of polymerization (P) is calculated by the following formula (2).
[Η] = (√2 / C ) × √ (η sp -log e η re1) ····· (1)
P = 500 × {antilog ₁₀ ([η] /0.168) −1} (2)
C: Concentration of test solution (g / l)

  The PVC-based substrate may contain a resin other than polyvinyl chloride as long as the object of the present invention is not impaired. Examples of the resin other than the polyvinyl chloride include polyolefin, polyester, polyimide, polyamide and the like. One of the other resins may be used, or two or more of them may be used in combination. Although it does not specifically limit as a content rate of resin other than the said polyvinyl chloride, For example, 1.0-10.0 mass% is preferable with respect to a PVC-type base material total mass (100 mass%), and more. Preferably it is 1.0-5.0 mass%.

  The PVC base material may contain any appropriate additive as long as the object of the present invention is not impaired. Such additives may be used alone or in combination of two or more. Such an additive is preferably a plasticizer. The PVC base material can exhibit more excellent flexibility, stretchability and the like by containing a plasticizer.

  Examples of plasticizers include phthalate ester plasticizers, trimellitic ester plasticizers, adipate ester plasticizers (dioctyl adipate, diisononyl adipate, etc.), phosphate ester plasticizers (tricresyl phosphate, etc.) ), Citrate plasticizers (tributyl acetylcitrate, etc.), sebacic acid ester plasticizers, aceleic acid ester plasticizers, maleic acid ester plasticizers, benzoic acid ester plasticizers, polyether polyester plasticizers , Epoxy polyester plasticizers (epoxidized soybean oil, epoxidized linseed oil, etc.), polyester plasticizers (low molecular polyesters composed of carboxylic acid and glycol, etc.) and the like. Among these, as the plasticizer used for the PVC base material, an ester plasticizer is preferable. Only one type of plasticizer may be used, or two or more types may be used in combination.

  When the PVC-based substrate contains a plasticizer, the plasticizer content (mass%) is appropriately set according to the purpose. The lower limit of the plasticizer content (% by mass) is preferably 0.5% by mass or more, more preferably 1.0% by mass or more, with respect to the resin component in the PVC-based substrate. It is. Moreover, as an upper limit of the content rate (mass%) of a plasticizer, Preferably it is 50 mass% or less with respect to the resin component in a PVC-type base material, More preferably, it is 40 mass% or less. When the content ratio (% by mass) of the plasticizer is in such a range, the stretchability and flexibility of the PVC base material are excellent, and the followability of the PVC base material is good.

  A stabilizer, a colorant, an antistatic agent, an ultraviolet absorber, and the like may be added to the PVC-based substrate within a range that does not impair the object of the present invention.

  There is no restriction | limiting in particular in the thickness of a PVC-type base material, According to the objective, it sets suitably. For example, the lower limit of the thickness of the PVC-based substrate is preferably 20 μm or more, more preferably 40 μm or more, and even more preferably 50 μm or more. For example, the upper limit value of the thickness of the PVC-based substrate is preferably 200 μm or less, more preferably 150 μm or less, and further preferably 130 μm or less. When the thickness of the PVC base material is in such a range, the handleability is excellent, and the stretchability, flexibility, followability, etc. of the PVC base material are excellent.

  Although the maximum elongation (%) measured according to JIS K 7127 of a PVC-type base material is not specifically limited, For example, 100% or more is preferable, More preferably, it is 200% or more. The upper limit of the maximum elongation (%) is not particularly limited, but is preferably about 1000%, for example. When the maximum elongation (%) of the PVC-based substrate is in such a range, the PVC-based substrate is ensured to have an appropriate elongation, and the followability of the rubber-based adhesive tape to the adherend is improved.

  For example, a surface treatment may be applied to the surface of the PVC-based substrate as necessary. The surface treatment is not particularly limited, for example, corona discharge treatment, plasma treatment, sand mat processing treatment, ozone exposure, flame exposure, high piezoelectric exposure, ionizing radiation treatment, etc., chemical treatment such as chromic acid treatment, etc. And easy adhesion treatment (coating treatment) with a coating agent (undercoat layer formation).

  Although the manufacturing method of a PVC-type base material is not specifically limited, For example, well-known film (sheet) molding methods, such as injection molding, extrusion molding (T-die extrusion molding etc.), inflation molding, calendar molding, blow molding, casting molding, etc. Is mentioned.

(Rubber adhesive layer)
The rubber-based pressure-sensitive adhesive layer is formed by forming a rubber-based pressure-sensitive adhesive containing a rubber component (rubber-based polymer) as a main component in a layer shape.

  The content ratio (% by mass) of the rubber component in the rubber-based pressure-sensitive adhesive layer is 50% by mass or more, preferably 55% by mass or more, and more preferably 60% by mass or more. The upper limit of the content ratio (% by mass) is not particularly limited, but is, for example, 90% by mass or less, preferably 85% by mass or less, and more preferably 80% by mass or less. When the content ratio (% by mass) of the rubber component in the rubber-based pressure-sensitive adhesive layer is within such a range, an adhesive force necessary for the rubber-based pressure-sensitive adhesive tape is ensured.

  The rubber-based pressure-sensitive adhesive layer contains a rubber component having a relative dielectric constant of 4.0 or more as a rubber component. In the present specification, a rubber component having a relative dielectric constant of 4.0 or more is referred to as a “high relative dielectric constant rubber component”.

  The content ratio (% by mass) of the high relative dielectric constant rubber component in the rubber component is 3 to 100% by mass (3 to 100% by mass). The lower limit of the content (mass%) is preferably 4 masses or more. When the content ratio (% by mass) of the high relative dielectric constant rubber component in the rubber component is within such a range, generation of static electricity is suppressed in the rubber-based adhesive tape having the rubber-based adhesive layer.

  In consideration of the adhesive strength of the rubber-based adhesive layer (rubber-based adhesive tape) under low temperature conditions, the upper limit of the content ratio (% by mass) of the high relative dielectric constant rubber component in the rubber component is preferably It is 90 mass% or less, More preferably, it is 85 mass% or less.

  The lower limit of the content (mass%) of the high relative dielectric constant rubber component in the rubber component is 10 mass% or more, and the upper limit of the content (mass%) is 90 mass% or less (preferably 85 mass). In the rubber adhesive tape having the rubber adhesive layer, the generation of static electricity is further suppressed.

  The high relative dielectric constant rubber component is not particularly limited as long as it is a rubber component (rubber polymer) having a relative dielectric constant of 4.0 or more, and is appropriately selected according to the purpose. Specific high dielectric constant rubber components include, for example, chloroprene rubber (including carboxyl modification), acrylonitrile-butadiene copolymer rubber (including carboxyl modification), chlorosulfonated polyethylene rubber, and chlorinated polyethylene rubber. And polysulfide rubber. These may be used alone or in combination of two or more.

  The rubber-based pressure-sensitive adhesive layer contains a rubber component having a relative dielectric constant of less than 4.0 as a rubber component other than the high relative dielectric constant rubber component. In this specification, a rubber component having a relative dielectric constant of less than 4.0 is referred to as a “low relative dielectric constant rubber component”.

  The low relative dielectric constant rubber component is not particularly limited as long as it is a rubber component (rubber polymer) having a relative dielectric constant of less than 4.0, and is appropriately selected according to the purpose. Specific low dielectric constant rubber components include, for example, natural rubber, modified natural rubber, isoprene rubber, polybutadiene rubber, styrene-butadiene copolymer rubber, ethylene-propylene copolymer rubber, ethylene-propylene-diene. System copolymer rubber and the like. These may be used alone or in combination of two or more.

  The modified natural rubber comprises 50% by mass or more (preferably 60% by mass or more) of a structure derived from natural rubber. Examples of the modified natural rubber include graft-modified natural rubber obtained by graft-polymerizing a monomer to natural rubber.

  As the monomer to be graft polymerized with natural rubber, one or more monomers that can be graft polymerized with natural rubber such as acrylic monomers and styrene are used.

  As the modified natural rubber, an acrylic modified natural rubber in which 50% by mass or more of the monomer to be graft polymerized with the natural rubber is an acrylic monomer is preferable.

  In the acrylic modified natural rubber, the acrylic monomer to be graft polymerized with the natural rubber is a (meth) acrylic acid alkyl ester having a linear or branched alkyl group having 1 to 16 carbon atoms (for example, methyl acrylate, And ethyl acrylate, isopropyl acrylate, tert-butyl acrylate, methyl methacrylate (MMA), ethyl methacrylate, isopropyl methacrylate, tert-butyl methacrylate), acrylic acid, and methacrylic acid. These may be used alone or in combination of two or more.

  As the acrylic monomer to be graft polymerized with natural rubber, methyl methacrylate (MMA) is preferable for the reason that the relative dielectric constant is easily controlled.

  In addition, there is no restriction | limiting in particular as a method of graft-polymerizing monomers, such as an acryl-type monomer, to natural rubber, A well-known polymerization method is used.

(Measurement method of relative permittivity)
The relative dielectric constant of the rubber component is determined by the method shown below. The rubber component was dissolved in toluene, applied onto a PET film provided with a silicone release layer, and the coated material was allowed to stand for 3 minutes in a room temperature environment (23 ° C., 50% RH). Dry at 3 ° C. for 3 minutes to form a rubber layer having a thickness of 40 μm. Only the rubber layer is sandwiched between the electrodes, and the capacitance of the rubber is measured using a circuit element measuring instrument (product name “LCR Hitester 3522-50”, manufactured by Hioki Electric Co., Ltd.). The frequency at the time of measurement is 1 kHz, and the voltage is 0.3V. Using the measured capacitance value, the relative dielectric constant is calculated from the following formula. Note that ε ₀ in the equation is a dielectric constant of vacuum.
Dielectric constant = capacitance (nF) × sample thickness (mm)} / {ε ₀ × area (mm ² )}

  The rubber-based pressure-sensitive adhesive layer contains other components as required in addition to the rubber component. Examples of other components contained in the rubber-based pressure-sensitive adhesive layer include a tackifier, a crosslinking agent, and a plasticizer.

  Although it does not restrict | limit especially as a tackifier used for a rubber-type adhesive layer, Well-known rosin-type resin, rosin derivative resin, petroleum-type resin (C5 type | system | group, C9 type | system | group), terpene-type resin, ketone-type resin, etc. 1 type, or 2 or more types selected from these various tackifier resins can be used.

  Examples of the rosin resin include, in addition to rosins such as gum rosin, wood rosin, and tall oil rosin, stabilized rosin, polymerized rosin, and modified rosin. Examples of the rosin derivative resin include esterified products, phenol-modified products and esterified products of the rosin resin. Examples of the petroleum resin include aliphatic petroleum resins, aromatic petroleum resins, copolymer petroleum resins, alicyclic petroleum resins, and hydrides thereof. Examples of the terpene resin include α-pinene resin, β-pinene resin, aromatic modified terpene resin, terpene phenol resin, and the like. Examples of the ketone resin include ketone resins obtained by condensation of ketones and formaldehyde.

  Such tackifiers may be used alone or in appropriate combination of two or more. Particularly preferred tackifiers include rosin resins, rosin derivative resins, aliphatic (C5) petroleum resins, and terpene resins. These tackifying resins can be suitably used, for example, when the low relative dielectric constant rubber component is natural rubber or modified natural rubber.

  The lower limit of the compounding amount of the tackifier is appropriately set according to the purpose, and is preferably 10 parts by mass or more, and more preferably 15 parts by mass or more with respect to 100 parts by mass of the rubber component. Moreover, the upper limit of the compounding amount of the tackifier is appropriately set depending on the purpose, and is preferably 150 parts by mass or less, more preferably 100 parts by mass or less, with respect to 100 parts by mass of the rubber component. Preferably it is 50 mass parts or less. When the compounding amount of the tackifier is within such a range, it is easy to ensure the adhesive strength of the rubber-based adhesive layer.

  The crosslinking agent used for the rubber-based pressure-sensitive adhesive layer is not particularly limited. For example, an isocyanate-based crosslinking agent, an epoxy-based crosslinking agent, a melamine-based crosslinking agent, a peroxide-based crosslinking agent, a urea-based crosslinking agent, and a metal alkoxide. Examples thereof include a system crosslinking agent, a metal chelate crosslinking agent, a metal salt crosslinking agent, a carbodiimide crosslinking agent, an oxazoline crosslinking agent, an aziridine crosslinking agent, and an amine crosslinking agent. As the crosslinking agent, an isocyanate crosslinking agent and an epoxy crosslinking agent are particularly preferable. The said crosslinking agent may be used individually or in combination of 2 or more types.

  Examples of the isocyanate-based crosslinking agent include lower aliphatic polyisocyanates such as 1,2-ethylene diisocyanate, 1,4-butylene diisocyanate, and 1,6-hexamethylene diisocyanate; cyclopentylene diisocyanate, cyclohexylene diisocyanate, Cycloaliphatic polyisocyanates such as isophorone diisocyanate, hydrogenated tolylene diisocyanate, hydrogenated xylene diisocyanate; 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, 4,4′- Aromatic polyisocyanates such as diphenylmethane diisocyanate and xylylene diisocyanate, trimethylolpropane / tolylene diisocyanate trimer adduct [trade name “Coronate L” manufactured by Nippon Polyurethane Industry Co., Ltd. , Trimethylolpropane / hexamethylene diisocyanate trimer adduct [Nippon Polyurethane Industry Co., Ltd. under the trade name "Coronate HL"], and the like.

  Examples of the epoxy-based crosslinking agent include N, N, N ′, N′-tetraglycidyl-m-xylenediamine, diglycidylaniline, 1,3-bis (N, N-glycidylaminomethyl) cyclohexane, 1, 6-hexanediol diglycidyl ether, neopentyl glycol diglycidyl ether, ethylene glycol diglycidyl ether, propylene glycol diglycidyl ether, polyethylene glycol diglycidyl ether, polypropylene glycol diglycidyl ether, sorbitol polyglycidyl ether, glycerol polyglycidyl ether, penta Erythritol polyglycidyl ether, polyglycerol polyglycidyl ether, sorbitan polyglycidyl ether, trimethylolpropane polyglycid Ether, adipic acid diglycidyl ester, o-phthalic acid diglycidyl ester, triglycidyl-tris (2-hydroxyethyl) isocyanurate, resorcin diglycidyl ether, bisphenol-S-diglycidyl ether, two epoxy groups in the molecule The epoxy resin etc. which have the above are mentioned.

  The lower limit of the amount of the crosslinking agent is appropriately set according to the purpose, and is preferably 0.1 parts by mass or more with respect to 100 parts by mass of the rubber component. Further, the upper limit of the amount of the crosslinking agent is appropriately set depending on the purpose, and is preferably 4 parts by mass or less, more preferably 3.5 parts by mass or less, with respect to 100 parts by mass of the rubber component. More preferably, it is 3.0 mass parts or less, Most preferably, it is 2.5 mass parts or less. When the blending amount of the crosslinking agent is within such a range, it is easy to ensure the strength of the rubber-based pressure-sensitive adhesive layer.

  Although it does not restrict | limit especially as a plasticizer utilized for a rubber-type adhesive layer, For example, a phthalate ester type | system | group, trimellitic ester type | system | group (Dainippon Ink Co., Ltd. product, W-700, trimellitic acid trioctyl etc.) , Adipic acid ester type (manufactured by J Plus Co., Ltd., D620, dioctyl adipate, diisononyl adipate, etc.), phosphate ester type (tricresyl phosphate, etc.), adipic acid ester, citrate ester (tributyl acetyl citrate) Etc.), sebacic acid ester, aceric acid ester, maleic acid ester, benzoic acid ester, polyether polyester, epoxy polyester (epoxidized soybean oil, epoxidized linseed oil, etc.), polyester (low molecular weight consisting of carboxylic acid and glycol) Polyester) and the like. Among these, as the plasticizer used for the rubber-based pressure-sensitive adhesive layer, an ester-based plasticizer is preferable. Only one type of plasticizer may be used, or two or more types may be used in combination.

  The lower limit of the amount of the plasticizer is appropriately set according to the purpose, and is preferably 5 parts by mass or more, more preferably 10 parts by mass or more, and still more preferably 15 with respect to 100 parts by mass of the rubber component. More than part by mass. Further, the upper limit of the amount of the plasticizer is appropriately set according to the purpose, and is preferably 50 parts by mass or less, more preferably 40 parts by mass or less, and still more preferably with respect to 100 parts by mass of the rubber component. Is 30 parts by mass or less. When the blending amount of the plasticizer is in such a range, it is easy to ensure the flexibility of the rubber-based pressure-sensitive adhesive layer.

  The rubber-based pressure-sensitive adhesive layer is an anti-aging agent, a colorant (pigment, dye, etc.), an ultraviolet absorber, an antioxidant, a softener, a surfactant, a filler, a solvent, and a catalyst as long as the object of the present invention is not impaired. Further, other known additives such as a pressure-sensitive adhesive other than the rubber-based pressure-sensitive adhesive and a silane coupling agent may be blended.

  The method of forming the rubber-based pressure-sensitive adhesive layer is not particularly limited. For example, the rubber component (high relative dielectric constant rubber component, low relative dielectric constant rubber component) and other components such as a tackifier are predetermined solvents. A method of forming a rubber-based pressure-sensitive adhesive layer by applying a pressure-sensitive adhesive solution added to (for example, toluene) to the surface of a predetermined base material (for example, a PVC-based base material) and drying the applied material. Is mentioned.

  The thickness of the rubber-based pressure-sensitive adhesive layer is not particularly limited, and is appropriately set depending on the purpose. The lower limit value of the thickness of the rubber-based pressure-sensitive adhesive layer is, for example, preferably 1 μm or more, more preferably 2 μm or more, and further preferably 5 μm or more. Moreover, the upper limit of the thickness of a rubber-type adhesive layer is, for example, preferably 50 μm or less, more preferably 45 μm or less, and further preferably 40 μm or less. When the thickness of the rubber-based pressure-sensitive adhesive layer is in such a range, it is easy to ensure the adhesive strength, strength, and the like of the rubber-based pressure-sensitive adhesive layer.

  FIG. 2 is an explanatory view schematically showing another example of the rubber-based adhesive tape 10A. As shown in FIG. 2, the rubber-based adhesive tape 10 </ b> A includes an undercoat layer 13 between a polyvinyl chloride-based substrate 11 and a rubber-based adhesive layer 12. Thus, the rubber-based adhesive tape 10 </ b> A may be configured to include the undercoat layer 13.

(Undercoat layer)
The undercoat layer is formed on one surface of a film-like polyvinyl chloride base material for the purpose of enhancing anchoring property (anchor effect) on the polyvinyl chloride base material. The undercoat layer is mainly composed of a material having affinity for both the PVC-based substrate and the rubber-based pressure-sensitive adhesive layer. The undercoat layer is, for example, a mixed material of a material having affinity for a PVC-based substrate (substrate-compatible material) and a material having affinity for a rubber-based pressure-sensitive adhesive layer (rubber-compatible material), PVC It is composed of a composite material, etc., in which a material having affinity for a base material (base material affinity material) and a material having affinity for a rubber-based adhesive layer (rubber affinity material) are integrated by polymerization or the like .

  Polyacrylic acid esters are preferable as the material having affinity for the polyvinyl chloride-based substrate (substrate affinity material). Polyacrylic acid esters include (meth) acrylic acid for reasons such as adhesion to the substrate, followability to substrate deformation, and surface smoothness of the rubber-based pressure-sensitive adhesive layer formed on the substrate. Polymers synthesized from esters (for example, acrylic acid, butyl methacrylate, ethyl methacrylate, cyclohexyl methacrylate, etc.) are preferred, and in particular, materials having affinity for rubber-based pressure-sensitive adhesive layers (rubber-affinity materials) From the viewpoint of compatibility with the polymer, a polymer synthesized from methyl methacrylate (MMA) is preferable.

  Examples of the material having an affinity for the rubber-based pressure-sensitive adhesive layer (rubber-affinity material) include natural rubber, butyl-based rubber, styrene-butadiene-based rubber, and nitrile-butadiene-based rubber. Especially for reasons such as compatibility with materials that have an affinity for polyvinyl chloride-based substrates (substrate-compatible materials) and resistance to stress generated when the substrate is stretched, Natural rubber is preferred.

  A composite material that integrates a material that has an affinity for a polyvinyl chloride-based substrate (substrate-compatible material) and a material that has an affinity for a rubber-based adhesive layer (rubber-compatible material). Examples thereof include methyl methacrylate-grafted natural rubber obtained by graft polymerization of methyl methacrylate on natural rubber.

  The mixing ratio of the base affinity material and the rubber affinity material in the undercoat layer is appropriately set according to the purpose. The lower limit value of the mixing ratio (mass%) of the substrate affinity material in the undercoat layer is preferably 5% by mass or more, more preferably based on the total mass of the substrate affinity material and the rubber affinity material. Is 10% by mass or more, more preferably 15% by mass or more. Moreover, the upper limit of the mixing ratio (mass%) of the base material affinity material in the undercoat layer is preferably 50% by mass or less with respect to the total mass of the base material affinity material and the rubber affinity material. Preferably it is 40 mass% or less, More preferably, it is 30 mass% or less. When the mixing ratio (% by mass) of the substrate-compatible material in the undercoat layer is within such a range, the rubber-based pressure-sensitive adhesive layer is secured while ensuring the surface smoothness of the rubber-based pressure-sensitive adhesive layer in the rubber-based pressure-sensitive adhesive tape. And the PVC base material are bonded together.

  The thickness of the undercoat layer is not particularly limited and is appropriately set according to the purpose. The lower limit value of the thickness of the undercoat layer is, for example, preferably 0.1 μm or more, more preferably 0.2 μm or more, and further preferably 0.5 μm or more. The upper limit value of the thickness of the undercoat layer is, for example, preferably 10 μm or less, more preferably 5 μm or less, and further preferably 2 μm or less. When the thickness of the undercoat layer is in such a range, the rubber-based pressure-sensitive adhesive layer and the PVC-based substrate are bonded while ensuring the surface smoothness of the rubber-based pressure-sensitive adhesive layer in the rubber-based pressure-sensitive adhesive tape.

  The rubber-based adhesive tape may include other layers other than the PVC-based substrate, the rubber-based adhesive layer, and the undercoat layer as long as the object of the present invention is not impaired. As another layer, a back surface treatment agent layer (for example, a back surface treatment agent containing a release agent and a resin) formed on the back surface side of the PVC base material (the side opposite to the side on which the rubber adhesive layer is formed). For example). Examples of the release agent include silicone resins and long-chain alkyl acrylate (co) polymers (long-chain alkyl release agents). Examples of the resin include (meth) acrylic polymers, ethylene-vinyl acetate copolymers, and the like.

(Release liner)
A rubber release liner may be attached to the adhesive surface of the rubber adhesive layer provided in the rubber adhesive tape in a state before use. As such a release liner, for example, a base material having a release layer such as a plastic film or paper surface-treated with a release agent such as silicone-based, long-chain alkyl-based, fluorine-based, molybdenum sulfide; polytetrafluoroethylene, Low-adhesive substrate made of a fluoropolymer such as polychlorotrifluoroethylene, polyvinyl fluoride, polyvinylidene fluoride, tetrafluoroethylene / hexafluoropropylene copolymer, chlorofluoroethylene / vinylidene fluoride copolymer; And a low-adhesive substrate made of a nonpolar polymer such as a resin (for example, polyethylene, polypropylene, etc.).

(Method of manufacturing rubber adhesive tape)
The method for producing the rubber-based pressure-sensitive adhesive tape is not particularly limited. For example, a method of applying a pressure-sensitive adhesive solution for forming a rubber-based pressure-sensitive adhesive on a PVC-based substrate and drying the coated product, PVC An undercoat layer is formed on a base substrate, a pressure-sensitive adhesive solution for forming a rubber-based pressure-sensitive adhesive is applied on the undercoat layer, and the coated material is dried. A rubber-based pressure-sensitive adhesive on a release liner And a method of bonding a PVC base material (or a PVC base material with an undercoat layer) on the coated material after applying a pressure-sensitive adhesive solution for forming a film and drying the coated material. .

(Thickness of rubber adhesive tape)
The thickness of the rubber-based adhesive tape is not particularly limited, but the lower limit is preferably 40 μm or more, more preferably 50 μm or more, from the viewpoints of handleability and followability to substrate deformation such as stretching. . Moreover, as an upper limit of the thickness of a rubber-type adhesive tape, for example, Preferably it is 200 micrometers or less, More preferably, it is 150 micrometers or less.

(Form of rubber adhesive tape)
The rubber-based adhesive tape may be a rolled rubber-based adhesive tape wound in a roll shape. The wound body is a rubber-based adhesive tape wound body (a rubber-based adhesive tape wound body having no core) in which only the rubber-based adhesive tape is wound, and the rubber-based adhesive tape is rolled into the core. It may be a wound rubber adhesive tape wound body or the like. The core is not particularly limited. For example, a core using a plastic material as a main component (plastic core), or a core using a paper material as a main component (paper core). And a core (a metal core) in which a metal material is used as a main component. Further, the rubber-based adhesive tape may be in a form spreading in a plane.

(Maximum elongation of rubber adhesive tape)
Although the maximum elongation (%) measured according to JIS K 7127 of the rubber-based adhesive tape is not particularly limited, for example, it is preferably 100% or more, and more preferably 200% or more. The upper limit of the maximum elongation (%) is not particularly limited, but is preferably about 1000%, for example. When the maximum elongation (%) of the rubber-based adhesive tape is within such a range, the rubber-based adhesive tape has an appropriate stretchability, and the followability of the rubber-based adhesive tape to the adherend is improved.

(Static static control ability of rubber adhesive tape)
The rubber-based adhesive tape has the property that static electricity hardly occurs. For this reason, the rubber-based adhesive tape causes the operator to feel uncomfortable due to static electricity when the tape is drawn out or when the tape is applied, or foreign matter (for example, dust) is attracted by the static electricity and mixed into the tape. Etc. are suppressed. In addition, the static electricity suppression capability of a rubber-type adhesive tape can be evaluated by measuring the charging potential (kV) at the time of tape delivery mentioned later.

(Adhesive strength of rubber adhesive tape)
The rubber-based adhesive tape has an adhesive force that can be adhered to an adherend such as a metal plate in a peelable (re-peelable) state. The adhesive strength of the rubber-based adhesive tape is measured by the method described later.

(Other functions of rubber adhesive tape)
The rubber-based adhesive tape has followability (static followability) for adherends having various surface shapes such as a curved surface and an uneven surface as well as a flat surface. The rubber-based adhesive tape also has a function (dynamic follow-up) that keeps in close contact with the adherend even if it is deformed together with the adherend while being attached to the adherend. The rubber-based adhesive tape is also excellent in stretchability, flexibility, workability (handleability), storage stability, workability, and the like.

(Use of rubber adhesive tape)
The rubber-based adhesive tape can be used, for example, as a surface protecting adhesive tape. Specifically, for applications such as adhesive tape for surface protection when processing various metal members (for example, metal plates) such as stainless steel and aluminum, adhesive tape for dicing process, adhesive tape for surface protection of glass, etc. Can be used.

  The rubber-based adhesive tape is particularly preferably used for application to a surface of a metal member such as a metal plate. A coating film or the like may be formed on the surface of the metal member. In addition, you may affix and use a rubber-type adhesive tape on the to-be-adhered body which consists of other members, such as a resin member and glass, besides a metal member.

  Hereinafter, the present invention will be described in more detail based on examples. In addition, this invention is not limited at all by these Examples.

[Example 1]
(Production of polyvinyl chloride base material)
Soft polyvinyl chloride obtained by adding 27 parts by mass of a DOP plasticizer (bis (2-ethylhexyl phthalate), manufactured by J Plus Co., Ltd.) to 100 parts by mass of polyvinyl chloride (polymerization degree P = 100) The film was formed into a film shape by a calendar method to obtain a soft polyvinyl chloride film (polyvinyl chloride base material). The thickness of the obtained flexible polyvinyl chloride film is 110 μm, the elastic modulus (MD: Machine Direction) measured according to JIS-K-7127 is 250 MPa, and the maximum elongation measured according to JIS-K-7127. (MD) was 400%. Further, the surface roughness (arithmetic average surface roughness Ra) of the soft polyvinyl chloride film immediately after production was 0.1 μm. The arithmetic average surface roughness Ra was measured using a non-contact type surface roughness meter (WYKO NT-9100) (the same applies to other arithmetic average surface roughness Ra).

(Formation of undercoat layer)
Natural rubber (natural rubber latex, “HYTEX HA”, manufactured by Nomura Trading Co., Ltd., concentration 62.0% by mass) 100 parts by mass (solid content), methyl methacrylate (MMA, manufactured by Mitsubishi Gas Chemical Co., Inc.) 37.47 masses Parts, polyoxyethylene alkylphenyl ether (surfactant, “Neugen EA-190D”, manufactured by Daiichi Kogyo Seiyaku Co., Ltd.), cumene hydroperoxide (polymerization initiator, “Park Mill H-80”), An aqueous solution comprising a mixture of 0.48 parts by mass of NOF Corporation) and 0.34 parts by mass of tetraethylenepentamine (manufactured by Wako Pure Chemical Industries, Ltd.) is maintained at 40 ° C. for 2 hours to produce natural rubber Methyl methacrylate was graft polymerized to obtain an aqueous polymer solution (1) containing MMA-grafted natural rubber (MMA-g-NR).

  The aqueous polymer solution (1) was applied to one side of the soft polyvinyl chloride film, and the coated product was dried to form an undercoat layer. The thickness of the undercoat layer was 1.0 μm, and the arithmetic average surface roughness Ra was 0.5 μm.

(Formation of rubber adhesive layer)
First, MMA graft natural rubber I (MMA-g-NR-I) used for the rubber-based pressure-sensitive adhesive layer was produced as follows.

  100 parts by weight (solid content) of natural rubber (manufactured by Nomura Trading Co., Ltd., 30% by weight toluene), 75 parts by weight of methyl methacrylate (MMA, manufactured by Mitsubishi Gas Chemical Co., Ltd.), and a radical polymerization initiator (“Nyper BW”) , Manufactured by Nippon Oil & Fats Co., Ltd.) To a mixture obtained by mixing 0.3 parts by mass, an appropriate amount of toluene was added to obtain a mixed solution having a toluene concentration of 25% by mass. Then, the mixed liquid is maintained at 80 ° C. for 12 hours, and methyl methacrylate is graft-polymerized to natural rubber to obtain MMA-grafted natural rubber I (MMA-g-NR-I) for a rubber-based adhesive layer. It was.

  85 parts by mass of MMA-grafted natural rubber I (MMA-g-NR-I), 15 parts by mass of chloroprene rubber (CR, chloroprene / methacrylic acid copolymer, “Skyprene 570” manufactured by Tosoh Corporation), terpene adhesive 20 parts by mass of an imparting agent (terpene hydrocarbon resin, “YS Resin PX1150”, manufactured by Yasuhara Chemical Co., Ltd.), 2 parts by mass of an isocyanate-based crosslinking agent (aromatic polyisocyanate, “Coronate L”, manufactured by Nippon Polyurethane Industry Co., Ltd.), ultraviolet light Absorber (pentaerythritol-tetrakis [3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate], “SONGNOX1010PW”, manufactured by Sakai Chemical Industry Co., Ltd.), 3 parts by mass, DOTP plasticizer (terephthalic acid Bis (2-ethylhexyl), manufactured by J Plus Co., Ltd. 4 The parts by weight, to obtain a pressure-sensitive adhesive solution A was added to a predetermined amount of toluene.

  The pressure-sensitive adhesive solution A is applied to one side of the soft polyvinyl chloride film in the form of being laminated on an undercoat layer, and the coated material is dried by heating at 130 ° C. for 90 seconds to give a rubber-based pressure-sensitive adhesive having a thickness of 10 μm. An agent layer was formed. Thus, the rubber-based adhesive tape of Example 1 was obtained.

[Example 2]
A soft polyvinyl chloride film similar to that in Example 1 was prepared, and an undercoat layer (thickness: 1.0 μm, arithmetic average surface roughness Ra: 0.5 μm) made of the aqueous polymer solution (1) was formed on one surface thereof.

  Except that the blending amount of MMA-grafted natural rubber I (MMA-g-NR-I) was changed to 70 parts by mass and the blending amount of chloroprene rubber was changed to 30 parts by mass, the same as in Example 1. An adhesive solution B was prepared.

  The pressure-sensitive adhesive solution B is applied to one side of the soft polyvinyl chloride film in the form of being laminated on an undercoat layer, and the coated material is dried by heating at 130 ° C. for 90 seconds to give a rubber-based pressure-sensitive adhesive having a thickness of 10 μm. A rubber-based adhesive tape of Example 2 having an agent layer was obtained.

Example 3
A soft polyvinyl chloride film similar to that in Example 1 was prepared, and an undercoat layer (thickness: 1.0 μm, arithmetic average surface roughness Ra: 0.5 μm) made of the aqueous polymer solution (1) was formed on one surface thereof.

  Except that the blending amount of MMA-grafted natural rubber I (MMA-g-NR-I) was changed to 95 parts by weight and the blending amount of chloroprene rubber was changed to 5 parts by weight, the same as in Example 1. An adhesive solution C was prepared.

  The pressure-sensitive adhesive solution C is applied to one side of the soft polyvinyl chloride film in the form of being laminated on an undercoat layer, and the coated material is dried by heating at 130 ° C. for 90 seconds to form a rubber-based pressure-sensitive adhesive having a thickness of 10 μm. A rubber-based adhesive tape of Example 3 having an agent layer was obtained.

Example 4
A soft polyvinyl chloride film similar to that in Example 1 was prepared. And the adhesive solution A similar to Example 1 was apply | coated directly on the single side | surface of the soft polyvinyl chloride film, without forming an undercoat layer. The coated product was dried by heating at 130 ° C. for 90 seconds to obtain a rubber-based pressure-sensitive adhesive tape of Example 4 having a rubber-based pressure-sensitive adhesive layer having a thickness of 10 μm.

Example 5
A soft polyvinyl chloride film similar to that in Example 1 was prepared. A polymer aqueous solution (2) containing MMA-grafted natural rubber (MMA-g-NR) was obtained in the same manner as in Example 1 except that the amount of methyl methacrylate was changed to 35.5 parts by mass.

  The aqueous polymer solution (2) was applied to one side of the soft polyvinyl chloride film, and the coated product was dried to form an undercoat layer. The thickness of the undercoat layer was 1.0 μm, and the arithmetic average surface roughness Ra was 0.5 μm.

  The same pressure-sensitive adhesive solution A as in Example 1 was applied to one side of the soft polyvinyl chloride film in the form of being laminated on the undercoat layer, and the applied product was dried by heating at 130 ° C. for 90 seconds to obtain a thickness. A rubber adhesive tape of Example 5 having a 10 μm rubber adhesive layer was obtained.

Example 6
A rubber-based pressure-sensitive adhesive tape of Example 6 was produced in the same manner as in Example 1 except that the thickness of the rubber-based pressure-sensitive adhesive layer to be formed was changed to 8 μm.

Example 7
A soft polyvinyl chloride film similar to that in Example 1 was prepared, and an undercoat layer (thickness: 1.0 μm, arithmetic average surface roughness Ra: 0.5 μm) made of the aqueous polymer solution (1) was formed on one surface thereof.

  Except that the blending amount of MMA-grafted natural rubber I (MMA-g-NR-I) was changed to 0 parts by weight and the blending amount of chloroprene rubber was changed to 100 parts by weight, the same as in Example 1. An adhesive solution D was prepared.

  The pressure-sensitive adhesive solution D is applied to one surface of the soft polyvinyl chloride film in the form of being laminated on an undercoat layer, and the coated material is dried by heating at 130 ° C. for 90 seconds to give a rubber-based pressure-sensitive adhesive having a thickness of 10 μm. A rubber-based adhesive tape of Example 7 having an agent layer was obtained.

Example 8
A soft polyvinyl chloride film similar to that in Example 1 was prepared. A polymer aqueous solution (3) containing MMA-grafted natural rubber (MMA-g-NR) was obtained in the same manner as in Example 1 except that the blending amount of methyl methacrylate was changed to 19.1 parts by mass.

  A polymer aqueous solution (3) was applied to one side of the soft polyvinyl chloride film, and the coated product was dried to form an undercoat layer. The thickness of the undercoat layer was 1.0 μm, and the arithmetic average surface roughness Ra was 0.5 μm.

  The same adhesive solution B as in Example 2 was applied to one side of the soft polyvinyl chloride film in the form of being laminated on the undercoat layer, and the applied product was dried by heating at 130 ° C. for 90 seconds to obtain a thickness. A rubber adhesive tape of Example 8 having a 10 μm rubber adhesive layer was obtained.

Example 9
A soft polyvinyl chloride film similar to that in Example 1 was prepared, and an undercoat layer (thickness: 1.0 μm, arithmetic average surface roughness Ra: 0.00) consisting of the same aqueous polymer solution (3) as in Example 8 was prepared on one side. 5 μm) was formed.

  Except that the blending amount of MMA-grafted natural rubber I (MMA-g-NR-I) was changed to 30 parts by mass and the blending amount of chloroprene rubber was changed to 90 parts by mass, the same as in Example 1, An adhesive solution E was prepared.

  The pressure-sensitive adhesive solution E is applied to one surface of the soft polyvinyl chloride film in the form of being laminated on an undercoat layer, and the coated material is dried by heating at 130 ° C. for 90 seconds to give a rubber-based pressure-sensitive adhesive having a thickness of 10 μm. A rubber-based adhesive tape of Example 9 having an agent layer was obtained.

Example 10
A soft polyvinyl chloride film similar to that in Example 1 was prepared, and an undercoat layer (thickness: 1.0 μm, arithmetic average surface roughness Ra: 0.5 μm) made of the aqueous polymer solution (1) was formed on one surface thereof.

  The blending amount of MMA-grafted natural rubber I (MMA-g-NR-I) is changed to 30 parts by weight, the blending amount of chloroprene rubber is changed to 90 parts by weight, and the plasticizer is a DINP plasticizer (bisphthalate ( Isononyl)) A pressure-sensitive adhesive solution F was prepared in the same manner as in Example 1 except that the amount was changed to 40 parts by mass.

  The pressure-sensitive adhesive solution F is applied to one side of the soft polyvinyl chloride film in the form of being laminated on an undercoat layer, and the coated material is dried by heating at 130 ° C. for 90 seconds to form a rubber-based pressure-sensitive adhesive having a thickness of 10 μm. A rubber-based adhesive tape of Example 10 having an agent layer was obtained.

Example 11
A soft polyvinyl chloride film similar to that in Example 1 was prepared, and an undercoat layer (thickness: 1.0 μm, arithmetic average surface roughness Ra: 0.5 μm) made of the aqueous polymer solution (1) was formed on one surface thereof.

  In place of 15 parts by mass of chloroprene rubber, 15 parts by mass of acrylonitrile butadiene rubber (NBR, “Nipol DN219”, manufactured by Nippon Zeon Co., Ltd.) is used, and the plasticizer is 40 parts by mass of DINP plasticizer (bis (isononyl phthalate)). An adhesive solution G was produced in the same manner as in Example 1 except that the part was changed to the part.

  The pressure-sensitive adhesive solution F is applied to one side of the soft polyvinyl chloride film in the form of being laminated on an undercoat layer, and the coated material is dried by heating at 130 ° C. for 90 seconds to form a rubber-based pressure-sensitive adhesive having a thickness of 10 μm. A rubber-based adhesive tape of Example 11 having an agent layer was obtained.

[Comparative Example 1]
A soft polyvinyl chloride film similar to that in Example 1 was prepared, and an undercoat layer (thickness: 1.0 μm, arithmetic average surface roughness Ra: 0.5 μm) made of the aqueous polymer solution (1) was formed on one surface thereof.

  The amount of MMA-grafted natural rubber I (MMA-g-NR-I) was changed to 100 parts by mass, the amount of chloroprene rubber was changed to 0 parts by mass, and the plasticizer was a DINP plasticizer (bisphthalate ( Isononyl)) A pressure-sensitive adhesive solution H was prepared in the same manner as in Example 1 except that the content was changed to 40 parts by mass.

  The pressure-sensitive adhesive solution H is applied to one surface of the soft polyvinyl chloride film in the form of being laminated on an undercoat layer, and the coated material is dried by heating at 130 ° C. for 90 seconds to form a pressure-sensitive adhesive layer having a thickness of 10 μm. A pressure-sensitive adhesive tape of Comparative Example 1 was obtained.

[Comparative Example 2]
A soft polyvinyl chloride film similar to that in Example 1 was prepared, and an undercoat layer (thickness: 1.0 μm, arithmetic average surface roughness Ra: 0.5 μm) made of the aqueous polymer solution (1) was formed on one surface thereof.

  While using 15 parts by mass of styrene butadiene rubber (SBR, trade name “JSR 0061”, manufactured by JSR Corporation) instead of 15 parts by mass of chloroprene rubber, the plasticizer is a DINP plasticizer (bis (isononyl phthalate)) 40 Except having changed to the mass part, it carried out similarly to Example 1, and obtained the adhesive solution I.

  The pressure-sensitive adhesive solution I is applied to one side of the soft polyvinyl chloride film in the form of being laminated on an undercoat layer, and the coated material is dried by heating at 130 ° C. for 90 seconds to form a pressure-sensitive adhesive layer having a thickness of 10 μm. A pressure-sensitive adhesive tape of Comparative Example 2 was obtained.

[Evaluation 1: Measurement of charged potential when feeding out tape]
About the adhesive tape of each Example and each comparative example, the charging potential at the time of tape feeding was measured by the method shown below.

  A test sample S (length: 100 m, width: 0.1 m) of the adhesive tape wound up in a roll shape was allowed to stand for 1 hour in an environment of 5 ° C. and 45% RH and cured. Thereafter, the test sample S is set on a rotating shaft (rotating roller) 101 of the feeding device 100 as shown in FIG. 3, and the test sample S is wound around another rotating shaft (rotating roller) 102. Then, it was let out at a speed of 20 m / min. In such a state, a charged potential measuring device 200 (portable electrostatic monitor, “KSD-2000”, manufactured by Kasuga Electric Co., Ltd.) is placed at a position 10 cm away from the roll surface of the test sample S on the feeding side. Then, the charging potential (kV) of the test sample S was measured. The measurement results are shown in Table 1.

  If the charging potential (kV) is ± 8.0 kV or less, it can be said that the test sample suppresses the generation of static electricity. Further, if the charging potential (kV) is ± 5.0 kV or less, it can be said that the test sample particularly suppresses the generation of static electricity.

[Evaluation 2: Measurement of maximum elongation (%) of adhesive tape]
About the adhesive tape of each Example and each comparative example, the maximum elongation (%) of MD direction was measured according to JIS-K-7127. The measurement results are shown in Table 1.

[Evaluation 3: Measurement of 180 ° peeling adhesion (1)]
A test sample having a width of 20 mm and a length of 100 mm was cut out from the adhesive tape obtained in each example and each comparative example. The adhesive surface of the test sample was bonded to a SUS plate (SUS304 plate) by reciprocating a roller having a weight of 2.0 kg and a width of 30 mm under a condition of 23 ° C. and 50% RH. After leaving for 30 minutes under conditions of 23 ° C. and 50% RH, a 180 ° peel test was performed using a tensile tester at a tensile speed of 0.3 m / min and peeled off in accordance with JIS Z 0237. The adhesive strength (N / 20 mm) was measured. The measurement results are shown in Table 1.

[Evaluation 4: Measurement of 180 ° peeling adhesion (2)]
Except that the tensile speed was changed to 30 m / min, the adhesive strength (N / 20 mm) of the adhesive tape (test sample) obtained in each Example and each Comparative Example was the same as the measurement method in Evaluation 3. ) Was measured. The measurement results are shown in Table 1.

[Evaluation 5: Measurement of 180 ° peeling adhesion (3)]
Except that the temperature condition was changed to 0 ° C., the adhesive strength (N / 20 mm) for peeling off the adhesive tape (test sample) obtained in each Example and each Comparative Example was the same as the measurement method in Evaluation 3. Was measured. The measurement results are shown in Table 1.

  In addition, "part" in Table 1 means part by mass. The SBR of Comparative Example 2 has a relative dielectric constant of 1.0 and corresponds to a rubber component having a low relative dielectric constant. However, in Table 1, for convenience, SBR of Comparative Example 2 is described in the column of the rubber component having a high relative dielectric constant.

  As shown in Table 1, each of the rubber-based adhesive tapes of Examples 1 to 11 had a charging potential (kV) of ± 8.0 kV or less, and it was confirmed that the generation of static electricity was suppressed.

  On the other hand, in the pressure-sensitive adhesive tapes of Comparative Examples 1 and 2, since the pressure-sensitive adhesive layer does not contain a rubber component having a high relative dielectric constant, the charging potential (kV) is 11.0 kV and −9.0 kV, respectively. became. Thus, it was confirmed that the adhesive tapes of Comparative Examples 1 and 2 were likely to generate static electricity.

  In addition, about the adhesive force in low temperature conditions (0 degreeC), it is 0.15 N / 20mm or more desirably. Among Examples 1 to 11, each Example other than Example 7 had an adhesive strength of 15 N / 20 mm or more under low temperature conditions (0 ° C.).

  Of the rubber-based adhesive tapes of Examples 1 to 11, the rubber-based adhesive tapes of Examples 1 to 3 and Examples 5 to 11 (that is, other than Example 4) are a polyvinyl chloride base material and rubber. An undercoat layer is provided between the adhesive layer. Since the polyvinyl chloride base is highly polar, it is usually difficult to adhere to the nonpolar rubber adhesive layer. Therefore, as in Examples 1 to 3 and Examples 5 to 11, by providing an undercoat layer (a copolymer of rubber and acrylic) on a polyvinyl chloride base material, A rubber-based pressure-sensitive adhesive layer can be attached to the surface.

  DESCRIPTION OF SYMBOLS 10,10A ... Rubber adhesive tape, 11 ... Polyvinyl chloride base material, 12 ... Rubber adhesive layer, 13 ... Undercoat layer, 100 ... Feeding apparatus, 101 ... Rotating shaft (feeding side), 102 ... Other rotation Shaft (winding side), 200 ... charged potential measuring device, S ... test sample

Claims (8)

A film-like polyvinyl chloride base material;
It is arranged on one side of the polyvinyl chloride base material, and has a rubber-based pressure-sensitive adhesive layer containing a rubber component as a main component,
The rubber-based pressure-sensitive adhesive layer contains a high relative dielectric constant rubber component having a relative dielectric constant of 4.0 or more as the rubber component,
The rubber-type adhesive tape whose content rate (mass%) of the said high dielectric constant rubber component in the said rubber component is 3-100 mass%.   The rubber-based adhesive tape according to claim 1, wherein the rubber-based adhesive layer has a thickness of 1 μm to 50 μm.   The rubber-based pressure-sensitive adhesive tape according to claim 1 or 2, wherein the maximum elongation of the polyvinyl chloride-based substrate measured according to JIS-K-7127 is 100% or more.   The rubber-based adhesive tape according to any one of claims 1 to 3, wherein the polyvinyl chloride-based substrate has a thickness of 20 µm to 200 µm.   The rubber-based adhesive tape according to any one of claims 1 to 4, further comprising an undercoat layer between the polyvinyl chloride-based substrate and the rubber-based adhesive layer.   The rubber-based adhesive tape according to any one of claims 1 to 5, wherein the rubber-based adhesive layer has an adhesive strength of 0.20 N / 20 mm or more in an environment at 0 ° C.   The rubber-based adhesive tape according to any one of claims 1 to 6, wherein a content of all rubber components in the rubber-based adhesive layer is 50% by mass or more.   The rubber-based adhesive tape according to any one of claims 1 to 7, which is used for metal plate processing.

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