Adhesive tape and air conditioner piping

Abstract

Provided is an adhesive tape which has high flame retardancy and flexibility, has a favorable tape appearance, and has favorable workability during use. This adhesive tape comprises a substrate and an adhesive layer disposed on at least one surface of the substrate, wherein the substrate contains 100 parts by mass of a polyvinyl chloride resin and 0.5-4.5 parts by mass of an antimony compound, the ratio of the mass of the adhesive layer to the mass of the adhesive tape is 5-35 mass%, and the restoration rate after 20% elongation at a temperature of 23ºC and a relative humidity of 50% is a least 80%.

Description

Technical Field

[0005] , , , ,

[0001] The present invention relates to an adhesive tape and an air conditioner pipe.

Background Art

[0002] Polyvinyl chloride (PVC) tapes used for bundling electric wires, bundling wire harnesses for automobiles, bundling members for air conditioners, etc. generally include a base material containing a polyvinyl chloride resin and an adhesive layer disposed on the base material. Since the polyvinyl chloride resin has self-extinguishing properties and is difficult to burn, but the adhesive contained in the adhesive layer is easy to burn, generally PVC tapes may burn, and improvement in flame retardancy is desired.

[0003] As one method for improving the flame retardancy of PVC tapes, a method of adding an antimony compound can be mentioned. For example, Patent Documents 1 and 2 describe adding antimony oxide to the base material of PVC tapes.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, the present inventors have found that depending on the amount of the antimony compound added and the ratio of the adhesive layer in the tape, etc., there occur a decrease in flame retardancy, poor appearance (hue) of the tape due to clouding, etc., a decrease in the flexibility of the tape, and a decrease in workability during tape use due to a large rewinding force of the tape. An object of the present invention is to provide an adhesive tape having high flame retardancy and flexibility, good appearance of the tape, and good workability during tape use.

Means for Solving the Problems

[0006] The present invention includes the following embodiments.

[0007] [1] An adhesive tape comprising a base material and an adhesive layer disposed on at least one surface of the base material, The aforementioned substrate comprises 100 parts by mass of polyvinyl chloride resin and 0.5 to 4.5 parts by mass of an antimony compound. The ratio of the mass of the adhesive layer to the mass of the adhesive tape is 5 to 35% by mass. An adhesive tape that, at a temperature of 23°C and a relative humidity of 50%, has a recovery rate of 80% or more after 20% elongation.

[0008] [2] The adhesive tape according to [1], wherein the antimony compound has a particulate shape and an average particle size of 0.3 to 5 μm.

[0009] [3] The adhesive tape according to [2], wherein the antimony compound has an average particle size of 0.5 to 3 μm.

[0010] [4] The adhesive tape according to any one of [1] to [3], wherein the thickness of the base material is 60 to 380 μm.

[0011] [5] The adhesive tape according to any one of [1] to [4], wherein the thickness of the adhesive layer is 10 to 40 μm.

[0012] [6] The adhesive tape according to any one of [1] to [5], wherein the ratio of the mass of the adhesive layer to the mass of the adhesive tape is 10 to 25% by mass.

[0013] [7] The adhesive tape according to any one of [1] to [6], wherein the substrate contains 0.5 parts by mass or more and less than 3 parts by mass of the antimony compound.

[0014] [8] Adhesive tape for air conditioner piping, as described in any of [1] to [7].

[0015] Air conditioner piping bundled together using the adhesive tape described in [9][8]. [Effects of the Invention]

[0016] According to the present invention, it is possible to provide an adhesive tape that is highly flame-retardant and flexible, has a good appearance, and offers good workability when using the tape. [Brief explanation of the drawing]

[0017] [Figure 1] This is a cross-sectional view showing an example of adhesive tape according to this embodiment. [Figure 2] This is a cross-sectional view showing another example of the adhesive tape according to this embodiment. [Modes for carrying out the invention]

[0018] [Adhesive tape] The adhesive tape according to this embodiment includes a base material and an adhesive layer disposed on at least one surface of the base material. Here, the base material includes 100 parts by mass of polyvinyl chloride resin and 0.5 to 4.5 parts by mass of an antimony compound. The ratio of the mass of the adhesive layer to the mass of the adhesive tape is 5 to 35% by mass. Furthermore, the recovery rate of the adhesive tape after 20% elongation at a temperature of 23°C and a relative humidity of 50% is 80% or more.

[0019] The inventors have found that in a PVC tape, by controlling the addition amount of the antimony compound, the mass ratio of the adhesive layer, and the recovery rate after 20% elongation within the above ranges, an adhesive tape having high flame retardancy, flexibility, good appearance, and good workability during use can be obtained. When the base material contains 0.5 to 4.5 parts by mass of the antimony compound with respect to 100 parts by mass of the polyvinyl chloride resin, the flame retardancy is improved and the appearance (hue) defect of the tape due to clouding or the like can be suppressed. Further, when the mass ratio of the adhesive layer with respect to the mass of the adhesive tape is within the range of 5 to 35% by mass, the flame retardancy is improved and the workability during use is good. Further, when the recovery rate after 20% elongation of the adhesive tape is 80% or more, the flexibility of the adhesive tape is improved.

[0020] An example of the adhesive tape according to the present embodiment is shown in FIG. 1. The adhesive tape shown in FIG. 1 has a base material 1 and an adhesive layer 2 disposed on one surface of the base material 1. In FIG. 1, the adhesive layer 2 is disposed only on one surface of the base material 1, but the adhesive layer 2 may be disposed on both surfaces of the base material 1. Further, as shown in FIG. 2, from the viewpoint of improving the adhesion between the base material 1 and the adhesive layer 2, a primer layer 3 may be provided between the base material 1 and the adhesive layer 2. Further, the adhesive tape according to the present embodiment may include other layers, for example, a separator layer that is peeled off in advance when the adhesive tape is laminated on the adhesive layer in addition to the base material, the adhesive layer, and the primer layer. Further, the adhesive tape according to the present embodiment may be a wound body in which a sheet-shaped adhesive tape is wound with the adhesive layer inside.

[0021] (Base material) The base material according to the present embodiment contains a predetermined amount of a polyvinyl chloride resin and an antimony compound. The base material according to the present embodiment may contain other additives such as a plasticizer, an inorganic filler, a heat stabilizer, a modifier, a colorant, an antioxidant, a UV absorber, and a lubricant in addition to these components.

[0022] <Polyvinyl chloride resin> The substrate according to this embodiment includes a polyvinyl chloride resin. Examples of polyvinyl chloride resins include polyvinyl chloride (vinyl chloride homopolymer), copolymers of vinyl chloride with other monomers such as ethylene, propylene, vinyl acetate, vinylidene chloride, acrylic acid, acrylic acid esters, methacrylic acid, methacrylic acid esters, maleic acid, fumaric acid, acrylonitrile, alkyl vinyl ethers, etc., or mixtures thereof.

[0023] The average degree of polymerization of the polyvinyl chloride resin is preferably 1000 to 1500, and two or more types of polyvinyl chloride resins with different average degrees of polymerization may be used. An average degree of polymerization of 1000 or higher improves film-forming properties during substrate preparation. An average degree of polymerization of 1500 or lower improves the conformability of the adhesive tape to the object it is wrapped around. The mass percentage of polyvinyl chloride resin contained in 100% by mass of the substrate can be 30% by mass or more, preferably 30 to 80% by mass, and more preferably 40 to 70% by mass.

[0024] <Antimony Compounds> The substrate according to this embodiment contains an antimony compound. Examples of antimony compounds include antimony oxides such as antimony trioxide, antimony tetroxide, and antimony pentoxide, and sodium antimonate. One of these antimony compounds may be used, or two or more may be used in combination. Among these, antimony trioxide is preferred as the antimony compound from the viewpoint of synergistic effect in flame retardancy with polyvinyl chloride resin and low hygroscopicity.

[0025] The substrate according to this embodiment contains 0.5 to 4.5 parts by mass of antimony compound per 100 parts by mass of polyvinyl chloride resin. If the antimony compound content is less than 0.5 parts by mass, the flame retardancy of the adhesive tape decreases. If the antimony compound content exceeds 4.5 parts by mass, clouding occurs, resulting in a poor appearance (hue) of the adhesive tape. The antimony compound content is preferably 0.5 to 4 parts by mass, more preferably 0.5 parts by mass or more and less than 3 parts by mass, even more preferably 1 part by mass or more and less than 3 parts by mass, and particularly preferably 1.5 to 2.5 parts by mass.

[0026] The antimony compound may have a particulate shape and may be dispersed in the substrate. The average particle size of the antimony compound is preferably 0.3 to 5 μm. An average particle size of 0.3 μm or more suppresses aggregation of antimony compound particles and improves dispersibility, thereby improving the flame retardancy of the adhesive tape. Furthermore, an average particle size of 5 μm or less suppresses dispersion problems due to physical interference of antimony compound particles, improving the flame retardancy of the adhesive tape. It also improves the flexibility of the adhesive tape. The average particle size is more preferably 0.5 to 3 μm, and even more preferably 1 to 2 μm.

[0027] The average particle size of the antimony compound is measured by the following laser diffraction particle size distribution method. A suspension is prepared by adding 0.05% by mass of liquid detergent to 100 ml of a dispersant solution prepared by adding 0.05% by mass of liquid detergent to distilled water, adding an appropriate amount of antimony compound dropwise and mixing well, then adding 40 ml of distilled water, and irradiating with ultrasound for 2 minutes using a 160W ultrasonic generator. Using this suspension as the measurement sample, the volume-average particle size of the antimony compound is measured by laser diffraction particle size distribution using a Nikkiso Microtrac MT3300EXII (product name), and this value is taken as the average particle size.

[0028] <Plasticizer> The substrate according to this embodiment may contain a plasticizer. The plasticizer is not particularly limited as long as it can plasticize polyvinyl chloride resin, but examples include phthalate ester plasticizers such as di-n-octyl phthalate, di-2-ethylhexyl phthalate, diisononyl phthalate (DINP), dibutyl phthalate, butyl benzyl phthalate, diheptyl phthalate, dilauryl phthalate, didecyl phthalate, diundecyl phthalate, and ditridecyl phthalate; adipate ester plasticizers such as dioctyl adipate, ditrinonyl adipate, and diisodecyl adipate; polyester plasticizers; sebacate ester plasticizers; trimellitic acid ester plasticizers; and epoxy plasticizers such as epoxidized soybean oil. One of these plasticizers may be used, or two or more may be used in combination. Among these, phthalate ester plasticizers are preferred, and diisononyl phthalate (DINP) is more preferred.

[0029] The amount of plasticizer contained in the base material is preferably 20 to 80 parts by mass, more preferably 30 to 70 parts by mass, and even more preferably 40 to 60 parts by mass, per 100 parts by mass of polyvinyl chloride resin.

[0030] <Inorganic filler> The substrate according to this embodiment may contain an inorganic filler from the viewpoint of strength. The inorganic filler is not particularly limited, but examples include aluminum hydroxide, magnesium hydroxide, zirconium hydroxide, calcium hydroxide, potassium hydroxide, barium hydroxide, triphenyl phosphite, ammonium polyphosphate, polyphosphate amide, zirconium oxide, magnesium oxide, zinc oxide, titanium oxide, molybdenum oxide, guanidine phosphate, hydrotalcite, snaketite, zinc borate, anhydrous zinc borate, zinc metaborate, barium metaborate, red phosphorus, talc, alumina, silica, boehmite, bentonite, sodium silicate, calcium silicate, calcium sulfate, calcium carbonate, magnesium carbonate, etc. One of these inorganic fillers may be used, or two or more may be used in combination.

[0031] The amount of inorganic filler contained in the base material is not particularly limited, but is preferably 5 to 40 parts by mass, and more preferably 10 to 30 parts by mass, per 100 parts by mass of polyvinyl chloride resin.

[0032] <Heat-resistant stabilizer> The substrate according to this embodiment may contain a heat stabilizer from the viewpoint of improving heat resistance. Examples of heat stabilizers include zinc-based heat stabilizers such as zinc stearate and zinc octanoate. These zinc-based heat stabilizers may be used individually or in combination of two or more. In addition to the zinc-based heat stabilizers, other heat stabilizers may be used in combination. Examples of other heat stabilizers include barium stearate, calcium stearate, barium ricinoleate, calcium laurate, and calcium oleate. These other heat stabilizers may be used individually or in combination of two or more.

[0033] The amount of heat-resistant stabilizer contained in the base material is not particularly limited, but it is preferably 0.1 to 2 parts by mass, and more preferably 0.2 to 1 part by mass, per 100 parts by mass of polyvinyl chloride resin.

[0034] <Thickness of the base material> The thickness of the base material is preferably 60 to 380 μm. A base material thickness of 60 μm or more improves the flame retardancy of the tape, even when a certain amount of adhesive layer is present. Furthermore, a base material thickness of 380 μm or less provides appropriate tearability when using the tape, thus improving workability. The base material thickness is more preferably 80 to 300 μm, and even more preferably 100 to 200 μm.

[0035] <Method for manufacturing the base material> The method for manufacturing the substrate according to this embodiment is not particularly limited, but examples include a method of melt-kneading a resin composition containing polyvinyl chloride resin, an antimony compound, and other additives as needed, and then molding it. The melt-kneading method is not particularly limited, but examples include a method of mixing the resin composition so that it is uniformly dispersed using various mixers and kneaders equipped with heating devices such as a twin-screw extruder, a continuous or batch type kneader, rolls, and a Banbury mixer. The molding method is also not particularly limited, and the substrate can be molded into a sheet-like shape by known molding methods such as the calendering method, the T-die method, and the inflation method. Among these, the calendering method using a calendering machine is preferred from the viewpoint of productivity, color change, and uniformity of shape. As for the roll arrangement method in the calendering method, known methods such as L-type, inverted L-type, and Z-type can be adopted. The roll temperature can be 150 to 200°C, and preferably 155 to 190°C.

[0036] (Adhesive layer) <Adhesive> The adhesive layer according to this embodiment may contain an adhesive. The adhesive is preferably a rubber-based adhesive, and may be either solvent-type or emulsion-type. The rubber-based adhesive preferably contains at least one rubber selected from the group consisting of natural rubber and synthetic rubber, and a tackifying resin. The rubber-based adhesive is more preferably a mixture of natural rubber, synthetic rubber, and tackifying resin. When the rubber-based adhesive is a mixture of natural rubber, synthetic rubber, and tackifying resin, the content of the tackifying resin is preferably 50 to 150 parts by mass per 100 parts by mass of the total mass of natural rubber and synthetic rubber.

[0037] Examples of the natural rubber and synthetic rubber include natural rubber-methyl methacrylate copolymer latex, styrene-butadiene copolymer, acrylonitrile-butadiene copolymer, and methyl methacrylate-butadiene copolymer. These may be used individually or in combination of two or more.

[0038] The tackifying resin can be appropriately selected considering its softening point, compatibility with each component, etc. Examples of the tackifying resin include terpene resins, rosin resins, hydrogenated rosin resins, coumarone-indene resins, styrene resins, aliphatic petroleum resins, alicyclic petroleum resins, terpene-phenol resins, xylene resins, and other aliphatic hydrocarbon resins or aromatic hydrocarbon resins. One of these may be used, or two or more may be used in combination. The rubber-based adhesive can be freely selected as either a solvent type or an emulsion type, but the emulsion type is preferred from the viewpoint of low VOC generation.

[0039] <Mass ratio of the adhesive layer> In this embodiment, the ratio of the mass of the adhesive layer to the mass of the adhesive tape is 5 to 35% by mass. If the mass ratio is less than 5% by mass, the force required to unfold the adhesive tape is too small (too light), and the workability when using the tape decreases. On the other hand, if the mass ratio exceeds 35% by mass, the force required to unfold the adhesive tape is too large (too heavy), and the workability when using the tape decreases. In addition, the flame retardancy of the adhesive tape decreases. The mass ratio is preferably 7 to 30% by mass, more preferably 10 to 25% by mass, and even more preferably 10 to 20% by mass.

[0040] <Thickness of the adhesive layer> The thickness of the adhesive layer is preferably 10 to 40 μm. A thickness of 10 to 40 μm provides an appropriate amount of force for unfolding the adhesive tape, thereby improving workability during tape use. Furthermore, flame retardancy is improved. The thickness of the adhesive layer is more preferably 15 to 35 μm, and even more preferably 20 to 30 μm.

[0041] (Undercoat layer) From the viewpoint of improving the adhesion between the substrate and the adhesive layer, the adhesive tape according to this embodiment may optionally include a primer layer between the substrate and the adhesive layer.

[0042] The aforementioned undercoat layer may contain an undercoat. Examples of such undercoats include compositions comprising a graft polymer obtained by graft polymerization of methyl methacrylate onto natural rubber and an acrylonitrile-butadiene copolymer. Preferably, the undercoat contains 25 to 300 parts by mass of acrylonitrile-butadiene copolymer per 100 parts by mass of the graft polymer.

[0043] Preferably, the mass ratio of each component in the graft polymer is 70-50% by mass of natural rubber and 30-50% by mass of methyl methacrylate. A mass ratio of 30% by mass or more of methyl methacrylate improves the adhesion between methyl methacrylate and the substrate, effectively suppressing delamination of the adhesive tape. Furthermore, a mass ratio of 50% by mass or less of methyl methacrylate prevents the primer itself from hardening and becoming unable to follow the deformation of the substrate, thus effectively suppressing delamination of the adhesive tape.

[0044] Examples of the acrylonitrile-butadiene copolymer include a medium-nitrile type (25-30% by mass of acrylonitrile, 75-70% by mass of butadiene), a medium-high nitrile type (31-35% by mass of acrylonitrile, 69-65% by mass of butadiene), and a high-nitrile type (36-43% by mass of acrylonitrile, 64-57% by mass of butadiene). These may be used individually or in combination of two or more.

[0045] The thickness of the primer layer is not particularly limited, but can be, for example, 0.1 to 1 μm, or 0.3 to 0.5 μm.

[0046] (Physical properties of adhesive tape, etc.) The adhesive tape according to this embodiment has a recovery rate of 80% or more after 20% elongation at a temperature of 23°C and a relative humidity of 50%. A recovery rate of 80% or more improves the flexibility of the adhesive tape. A recovery rate of 85% or more is preferable, and 90% or more is more preferable. A higher recovery rate is preferable, and it may even be 100%. The method for controlling the recovery rate is not particularly limited, but for example, by making the average particle size of the antimony compound contained in the substrate 5 μm or less, the recovery rate can be made 80% or more. The recovery rate is measured by a method described later.

[0047] When the flame retardancy of the adhesive tape according to this embodiment is evaluated by the method described later in accordance with the UL94VTM test, it is preferable that the result is VTM-0 (total burning time of 5 test pieces is 30 to 50 seconds), and more preferably that the result is VTM-0 (total burning time of 5 test pieces is less than 30 seconds).

[0048] When a weather resistance test is performed on the adhesive tape according to this embodiment using the method described later, the color difference (ΔE) before and after the weather resistance test is preferably less than 1.0, and more preferably less than 0.5.

[0049] In this embodiment, from the viewpoint of workability when using the tape, the rewind force measured according to the high-speed rewind force of JIS Z 0237 (2009) is preferably 4N / 10mm or more and less than 10N / 10mm, and more preferably 4N / 10mm or more and less than 7N / 10mm.

[0050] The thickness of the adhesive tape according to this embodiment is not particularly limited, but can be, for example, 70 to 460 μm.

[0051] (Method of manufacturing adhesive tape) The method for manufacturing the adhesive tape according to this embodiment is not particularly limited, but it can be manufactured by, for example, the following method. The primer is applied to one surface of the substrate and thoroughly dried in a drying oven to form a primer layer. Next, the adhesive is applied to the primer layer and thoroughly dried in a drying oven to form an adhesive layer, thereby obtaining the adhesive tape. Note that the application and drying of the primer may be omitted. Examples of primer application methods include gravure printing, spray printing, kiss-roll printing, bar printing, knife printing, etc. Examples of adhesive application methods include comma printing, lip-die printing, gravure printing, roll printing, slot-die printing, etc.

[0052] (Application) The applications of the adhesive tape according to this embodiment are not particularly limited, but examples include air conditioner piping. In other words, the adhesive tape according to this embodiment can be an adhesive tape for air conditioner piping. The adhesive tape according to this embodiment has high flame retardancy and flexibility, a good appearance, and good workability when using the tape, making it particularly useful as an adhesive tape for air conditioner piping.

[0053] [Air conditioning piping] The air conditioner piping according to this embodiment is bound together using the adhesive tape according to this embodiment. For example, the refrigerant pipes of an air conditioner are bound together using the adhesive tape according to this embodiment. Because the air conditioner piping according to this embodiment is bound together with the adhesive tape according to this embodiment, the adhesive tape portion has high flame retardancy and flexibility, and also has a good appearance. [Examples]

[0054] The embodiments of the present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples. Measurement of the average particle size of antimony trioxide, each example 、 Comparative Example and reference examples The adhesive tapes produced were evaluated using the following method.

[0055] [Average particle size of antimony trioxide] A suspension was prepared by adding 0.05% by mass of liquid detergent to 100 ml of a dispersant solution prepared by adding distilled water, adding an appropriate amount of antimony trioxide dropwise and mixing well, then adding 40 ml of distilled water, and irradiating with ultrasound for 2 minutes using a 160 W output ultrasonic generator. Using this suspension as a measurement sample, the volume-average particle size of antimony trioxide was measured using the laser diffraction particle size distribution method with a Nikkiso Microtrac MT3300EXII (product name), and this value was defined as the average particle size.

[0056] [Flame retardant] The flame retardancy of the adhesive tape was evaluated according to the UL94VTM test. Specifically, a test piece (50 mm x 200 mm) was wrapped around a cylinder, mounted vertically on a clamp, and subjected to two 3-second indirect flame tests using a 20 mm flame. This test was performed five times, and the flame retardancy standard was determined based on the combustion behavior. The evaluation criteria for flame retardancy are as follows: A: VTM-0 (Total burn time of 5 test specimens is less than 30 seconds) B: VTM-0 (Total burning time of 5 test specimens is 30-50 seconds) C:VTM nonconformity

[0057] [exterior] A weather resistance test was conducted on adhesive tape under the following conditions using an accelerated weathering tester (product name: iSuper UV Tester, metal halide lamp, manufactured by Iwasaki Electric Co., Ltd.). (1) Irradiation (temperature: 50℃, humidity: 50%RH, time: 24 hours) (2) Condensation (irradiation + spray) (temperature: 50℃, time: 8 hours) (3) Pause (temperature: 35℃, humidity: 50%RH, time: 8 hours) The tests were carried out in the order of (1) to (3) above, with (1) to (3) counting as one cycle, for a total of 5 cycles, and a total of 200 hours of weather resistance testing was conducted. The appearance was evaluated based on the color difference (ΔE) before and after the weather resistance test according to the following criteria. A: ΔE is less than 0.5. B: ΔE is 0.5 or greater and less than 1.0. C:ΔE is 1.0 or greater.

[0058] [Recovery rate after 20% stretching] A 20mm x 200mm test specimen was marked at a distance of 50mm between the gauge marks (L0) and a distance of 100mm between the chucks (Lc). The test specimen was chucked in a tensile testing machine so that the distance between the chucks was 100mm, and the specimen was pulled at a tensile speed of 300mm / min. The test machine was stopped when the distance between the gauge marks L1 after the start of the test reached (L1-L0) / L0*100(%) = 20%, and the test specimen was removed and left to stand for 10 seconds. The distance between the gauge marks L2 after standing was measured, and the value [1-(L2-L0) / (L1-L0)]*100(%) was evaluated. The recovery rate was evaluated according to the following criteria. A: The recovery rate is 90% or higher. B: The recovery rate is 80% or higher, but less than 90%. C: The recovery rate is less than 80%.

[0059] [Workability] The rewinding force of the adhesive tape was measured according to the high-speed rewinding force of JIS Z 0237 (2009). Based on this rewinding force, the workability was evaluated according to the following criteria. If the rewinding force is less than 4N / 10mm, the force required to unfold the adhesive tape is too small (too light), and the workability when using the tape decreases. On the other hand, if the rewinding force is 10N / 10mm or more, the force required to unfold the adhesive tape is too large (too heavy), and the workability when using the tape decreases. A: The rewinding force is 4N / 10mm or more, and less than 7N / 10mm. B: The rewinding force is 7N / 10mm or more, and less than 10N / 10mm. C: The rewinding force is less than 4N / 10mm, or 10N / 10mm or more.

[0060] [Example 1] Polyvinyl chloride resin (product name: TH-1000, manufactured by Taiyo Vinyl Chloride Co., Ltd., average degree of polymerization: 1000) 100 parts by mass, antimony trioxide (product name: Hiromaster L-200, manufactured by Suzuyu Chemical Co., Ltd., average particle size: 1.2 μm) 0.7 parts by mass, diisononyl phthalate (DINP) (manufactured by J-Plus Co., Ltd.) 50 parts by mass, calcium carbonate (product name: Calciz P, manufactured by Kamishima Chemical Industry Co., Ltd.) 20 parts by mass, hydrotalcite (product name 1 part by mass of Alkamizer 1 (manufactured by Kyowa Chemical Industry Co., Ltd.), 0.2 parts by mass of zinc stearate (product name: Zinc Stearate, manufactured by NOF Corporation), 0.2 parts by mass of calcium stearate (product name: Calcium Stearate, manufactured by NOF Corporation), and 0.4 parts by mass of fatty acid ester as a lubricant (product name: Rikestar EW-100, manufactured by Riken Vitamin Co., Ltd.) were melt-mixed in a Banbury mixer until each component was uniformly dispersed. The resulting melt-mixed material was formed using a calender at a roll temperature of 165°C to produce a substrate with a thickness of 150 μm.

[0061] As a primer, a mixture emulsion (product name: KT4612A, manufactured by E-Tech Co., Ltd.) was prepared, consisting of a graft polymer latex obtained by graft polymerization of methyl methacrylate onto natural rubber and an acrylonitrile butadiene copolymer emulsion. 100 parts by mass of the mixture emulsion was applied to one surface of the substrate using a gravure printing method and dried to form a primer layer with a thickness of 1 μm.

[0062] An adhesive was prepared containing 100 parts by mass (solids) of natural rubber latex (product name: HA LATEX, manufactured by Resitex Co., Ltd.), 200 parts by mass (solids) of graft polymer latex (product name: MG-40S, manufactured by Resitex Co., Ltd.) obtained by graft polymerization of methyl methacrylate onto natural rubber, and 135 parts by mass (solids) of petroleum resin emulsion tackifier (product name: AP-1100-NT, manufactured by Arakawa Chemical Industries, Ltd.). The adhesive was applied to the primer layer using the comma method and dried to form an adhesive layer with a thickness of 25 μm, thereby producing an adhesive tape. The mass ratio of the adhesive layer to the mass of the adhesive tape was 15% by mass. After winding the adhesive tape into a tape log shape, it was cut to a width of 10 mm to obtain an adhesive tape for evaluation. The adhesive tape for evaluation was evaluated for flame retardancy, appearance, recovery rate after 20% elongation, and workability using the method described above. The results are shown in Table 1.

[0063] [Example 2] 、4 ~7, Comparative Examples 1~5 , reference example ] Except for changing the amount of antimony trioxide added, the average particle size, and the mass ratio of the adhesive layer to the mass of the adhesive tape as shown in Table 1, an adhesive tape for evaluation was prepared and evaluated in the same manner as in Example 1. The results are shown in Table 1. Regarding the antimony trioxide, in Example 6, antimony trioxide with an average particle size of 0.7 μm (product name: PATOX-KF, manufactured by Nippon Seikou Co., Ltd.) was used. In Example 7, antimony trioxide with an average particle size of 4.5 μm (product name: PATOX-CZ, manufactured by Nippon Seikou Co., Ltd.) was used. In Comparative Example 5, antimony trioxide with an average particle size of 8.0 μm (product name: PATOX-L, manufactured by Nippon Seikou Co., Ltd.) was used.

[0064] [Table 1]

[0065] As shown in Table 1, Example 1 of this embodiment 、2、4 ~7 , reference exampleThe adhesive tape of this embodiment received an "A" or "B" rating in all evaluation items: flame retardancy, appearance, recovery rate after 20% elongation, and workability. On the other hand, the adhesive tapes of Comparative Examples 1 to 5 received a "C" rating in at least one of the evaluation items: flame retardancy, appearance, recovery rate after 20% elongation, and workability. Therefore, it was found that the adhesive tape of this embodiment has high flame retardancy and flexibility, a good appearance, and good workability when using the tape. [Explanation of symbols]

[0066] 1 Base material 2. Adhesive layer 3. Primer layer

Claims

1. An adhesive tape comprising a base material and an adhesive layer disposed on at least one surface of the base material, The aforementioned substrate comprises 100 parts by mass of polyvinyl chloride resin and 0.5 to 2.5 parts by mass of an antimony compound. The antimony compound has a particle shape and an average particle diameter of 0.3 to 5 μm. The ratio of the mass of the adhesive layer to the mass of the adhesive tape is 5 to 35% by mass. An adhesive tape having a recovery rate of 80% or more after 20% elongation at a temperature of 23°C and relative humidity of 50%.

2. The adhesive tape according to claim 1, wherein the antimony compound has an average particle size of 0.5 to 3 μm.

3. The adhesive tape according to claim 1 or 2, wherein the thickness of the substrate is 60 to 380 μm.

4. The adhesive tape according to any one of claims 1 to 3, wherein the thickness of the adhesive layer is 10 to 40 μm.

5. The adhesive tape according to any one of claims 1 to 4, wherein the ratio of the mass of the adhesive layer to the mass of the adhesive tape is 10 to 25% by mass.

6. The adhesive tape for air conditioner piping according to any one of claims 1 to 5.

7. Air conditioner piping bundled using the adhesive tape described in claim 6.

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