End tape

Abstract

[Problem] To provide a binding tape that has high abrasion resistance and that is flexible to allow bending of electrical wires, and that is also excellent in binding efficiency. [Solution] A binding tape having a base material layer that comprises a nonwoven fabric and a resin layer layered on one surface of the nonwoven fabric, and a pressure-sensitive-adhesive layer, wherein the tensile elastic modulus in the longitudinal direction and width direction of the binding tape is 0.08-1.5 MPa. The mass per unit area of the nonwoven fabric is preferably 20-350 g / m2. The layered amount of the resin layer is preferably 20-350 g / m2.

Description

Technical Field

[0001] The present invention relates to a bundling tape.

Background Art

[0002] In wiring of automobiles and the like, a bundle of electric wires in a predetermined shape using a bundling tape is used. For a tape for bundling electric wires and the like, from the viewpoint of preventing the electric wires from coming into contact with surrounding walls and interior materials and being damaged, it is required to have excellent wear resistance. In recent years, with the spread of electric vehicles, the diameter of the bundled electric wires has been increasing, but from the viewpoint of design freedom, it is required to be bendable even in a state where the bundling tape is wound. Hitherto, as a tape with high wear resistance, for example, a bundling tape using a polyethylene terephthalate (PET) woven fabric as a base material, a bundling tape having a base material obtained by laminating a non-woven fabric having a specific thickness and a resin film, etc. have been proposed (for example, Patent Documents 1, 2, etc.). However, since such a bundling tape does not stretch in the longitudinal direction, there is a problem that the bendability of the bundled electric wires is poor.

[0003] As a bundling tape having flexibility that allows the bundled electric wires to be bent, for example, Patent Document 3 proposes an adhesive tape including a film base material containing an aromatic vinyl-based elastomer, a styrene-based copolymer, and a styrene-based resin, and an adhesive layer. Further, Patent Document 4 proposes a protective tube in which a sheet made of a thermoplastic resin and having a 100% tensile modulus of 50 MPa or less is wound in the circumferential direction.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Patent Document 3

Patent Document 4

Summary of the Invention

Problems to be Solved by the Invention

[0005] In recent years, in the wiring applications of automobiles and the like, there has been a demand for higher abrasion resistance. That is, in the scrape abrasion test, a binding tape capable of achieving more than 100 abrasion times is required. However, conventional binding tapes have a problem that they cannot pass the above abrasion test. In addition, the binding tape binds the object while pulling the tape in the longitudinal direction during the binding operation. If the tape stretches too much, it becomes difficult to fix the object, and the workability deteriorates. Therefore, there is a demand for a binding tape that can achieve both flexibility and binding workability. Therefore, an object of the present invention is to provide a binding tape having high abrasion resistance, flexibility capable of bending electric wires, and excellent binding workability.

Means for Solving the Problems

[0006] As a result of intensive studies on the above problems, the inventors of the present application have found that a binding tape having a base material layer including a non-woven fabric and a resin layer, and having a tensile elastic modulus in the longitudinal direction and the width direction of the binding tape within a specific range can solve all the above problems, and have completed the present invention. That is, the present invention has the following aspects. [1] A binding tape having a base material layer including a non-woven fabric and a resin layer laminated on one surface of the non-woven fabric, and an adhesive layer, wherein the tensile elastic modulus in the longitudinal direction and the width direction of the binding tape is 0.08 to 1.5 MPa. [2] The binding tape according to [1], wherein the basis weight of the non-woven fabric is 20 to 350 g / m 2 2. [3] The binding tape according to [1] or [2], wherein the laminated amount of the resin layer is 20 to 350 g / m 2 2. [4] The bundling tape according to any one of [1] to [3], wherein the non-woven fabric contains fibers (A) containing a thermoplastic elastomer. [5] The bundling tape according to [4], wherein the thermoplastic elastomer contains at least one selected from an olefin-based thermoplastic elastomer, a urethane-based thermoplastic elastomer, and a styrene-based thermoplastic elastomer. [6] The bundling tape according to any one of [1] to [5], wherein the resin layer contains at least one resin selected from polyvinyl chloride and an ethylene-vinyl acetate copolymer. [7] The bundling tape according to any one of [1] to [6], wherein the non-woven fabric has a fused portion. [8] The fused portion is provided on the other surface of the non-woven fabric where the resin layer is not laminated, and the ratio of the total area of the fused portion is 20 to 80% with respect to the total area of the other surface of the non-woven fabric. The bundling tape according to [7]. [9] The bundling tape according to any one of [1] to [8], which is for bundling electric wires or the like. [Effect of the Invention]

[0007] According to the present invention, it is possible to provide a bundling tape having high wear resistance, flexibility that allows electric wires to be bent, and excellent bundling workability. [Brief Description of the Drawings]

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

[0009] The present invention will be described in detail below, but the present invention is not limited to the following aspects. [Binding tape] The binding tape according to the present invention is a binding tape having a base material layer including a non-woven fabric and a resin layer laminated on one surface of the non-woven fabric, and an adhesive layer, wherein the tensile elastic modulus in the longitudinal direction and the width direction of the binding tape is 0.08 to 1.5 MPa. In this specification, the "longitudinal direction of the binding tape" means the direction when the tape is pulled out in the state where the binding tape is wound in a roll shape. Further, the "width direction of the binding tape" means the direction orthogonal to the longitudinal direction. In this specification, the longitudinal direction of the binding tape may be described as the "MD direction", and the "width direction" may be described as the "TD direction".

[0010] The binding tape according to the present invention has a tensile elastic modulus in the longitudinal direction (MD direction) and the width direction (TD direction) of the tape of 0.08 to 1.5 MPa. The binding tape according to the present invention includes a base material layer including a non-woven fabric and a resin layer, and since the tensile elastic modulus in the MD direction and the TD direction of the binding tape is 0.08 to 1.5 MPa, the flexibility of the binding tape becomes good, and the bundled electric wires can be bent after bundling. Further, it is possible to prevent the tape from stretching too much during the bundling operation and deteriorating the workability. Further, such a binding tape is also excellent in abrasion resistance. That is, the binding tape according to the present invention can have the number of abrasion times in the scrape abrasion test of 100 times or more. The tensile elastic modulus in the MD direction and the TD direction of the binding tape is in the range of 0.08 to 1.5 MPa, preferably 0.08 to 0.92 MPa, more preferably 0.08 to 0.7 MPa, and particularly preferably 0.08 to 0.5 MPa. By setting the tensile elastic modulus in the MD direction and the TD direction of the binding tape to 0.08 MPa or more, high wear resistance and good binding workability can be obtained. By setting the tensile elastic modulus to 1.5 MPa or less, a binding tape with excellent flexibility can be obtained. In this specification, the tensile elastic modulus in the MD direction and the TD direction of the binding tape refers to the value measured according to the measurement conditions of tensile strength and elongation in JIS Z0237 (2008). Specifically, it refers to the value measured by the following method. (Tensile elastic modulus in the MD direction and the TD direction of the binding tape) A binding tape test piece with a width of 19 mm and a length of 200 mm is sandwiched and fixed to the chuck part of a tensile testing machine so that the distance between the chucks is 100 mm. In an environment of room temperature 23°C and relative humidity 50%RH, the test piece is pulled at a speed of 300 mm / min, and the tensile stress and strain are measured. The ratio of the tensile stress to the strain between 5% and 10% strain is taken as the tensile elastic modulus, which is calculated by linear regression. In the measurement of the MD direction of the binding tape, the "width" of the test piece means the length in the TD direction, and the "length" means the length in the MD direction. Also, in the measurement of the TD direction of the binding tape, the "width" of the test piece means the length in the MD direction, and the "length" means the length in the TD direction.

[0011] In one aspect, the ratio of the tensile elastic modulus in the TD direction of the binding tape to the tensile elastic modulus in the MD direction (tensile elastic modulus in the TD direction of the tape / tensile elastic modulus in the MD direction of the tape, hereinafter sometimes simply referred to as "TD / MD") is preferably 0.8 to 1.3, and more preferably 0.9 to 1.2. If the ratio of the tensile elastic modulus of the binding tape is within the above range, flexibility and binding workability are more likely to be better.

[0012] FIG. 1 is a cross-sectional view showing one embodiment of the binding tape of the present invention. The binding tape 100 has a structure in which a non-woven fabric 10, a resin layer 20, and an adhesive layer 30 are laminated in this order. The tensile elastic modulus of the binding tape 100 in the MD direction and the TD direction is in the range of 0.08 to 1.5 MPa. The binding tape 100 having such a structure has high wear resistance, flexibility that allows wires to be bent, and excellent binding workability.

[0013] (Base material layer) The base material layer in the binding tape according to the present invention includes a non-woven fabric and a resin layer laminated on one surface of the non-woven fabric.

[0014] <Non-woven fabric> The non-woven fabric used for the base material layer is not particularly limited as long as it has the effects of the present invention. For example, non-woven fabrics made by the spunbond method, non-woven fabrics made by the spunlace method, non-woven fabrics made by the meltblown method, etc. can be used. The non-woven fabric may be a single layer or a laminated non-woven fabric composed of a plurality of layers. In the case of a laminated non-woven fabric, non-woven fabrics made by a plurality of methods may be laminated. Among these, from the viewpoint of mechanical strength, it is preferable to use a non-woven fabric (spunbond non-woven fabric) made by the spunbond method. In addition, the basis weight of the non-woven fabric is preferably 20 to 350 g / m 2 more preferably 30 to 320 g / m 2 even more preferably 50 to 300 g / m 2 If the basis weight of the non-woven fabric is within the above range, wear resistance is likely to be improved while suppressing an increase in tape weight. Also, its porosity is preferably 40 to 90%. In addition, the apparent density is preferably 0.1 to 0.5 g / cm 3 more preferably 0.2 to 0.45 g / cm 3 If the apparent density of the non-woven fabric is within the above range, the flexibility of the bound product is likely to be good while maintaining high wear resistance.

[0015] The nonwoven fabric preferably contains fibers (A) including a thermoplastic elastomer. A thermoplastic elastomer refers to an elastomer that softens upon heating to exhibit fluidity, returns to a rubbery state upon cooling, and exhibits rubber elasticity at normal temperature. By including fibers (A) including a thermoplastic elastomer in the nonwoven fabric, the flexibility of the binding tape is likely to be improved. Also, it becomes easier to adjust the tensile elastic modulus in the MD direction and TD direction of the binding tape within the range of 0.08 to 1.5 MPa.

[0016] <Fibers (A)> In this specification, "fibers (A) including a thermoplastic elastomer" means that at least a thermoplastic elastomer component is included in the components constituting the fibers (A). The nonwoven fabric according to the present invention is preferably composed of fibers including fibers (A) including a thermoplastic elastomer. As the thermoplastic elastomer contained in the fibers (A), for example, those having a tensile strength of 2 to 40 MPa measured in accordance with the standard of JIS K7311-1995 are preferred. Examples of such thermoplastic elastomers include olefin-based thermoplastic elastomers (TPO), urethane-based thermoplastic elastomers (TPU), styrene-based thermoplastic elastomers (TPS), ester-based thermoplastic elastomers, polyamide-based thermoplastic elastomers (TPAE), and the like. These thermoplastic elastomers may be used alone or in combination of two or more. The specific measurement method of the tensile strength of the thermoplastic elastomer is as follows. (Measurement Method of Tensile Strength of Thermoplastic Elastomer) The tensile strength is measured in accordance with the standard of JIS K7311-1995. Specifically, a thermoplastic elastomer resin is injection-molded to produce a flat sample with a size of 100 mm square and a thickness of 2 mm. A sample punched out with a No. 3 dumbbell (see Figure 4) defined in JIS K6251 is used as a test piece, and the test piece is sandwiched and fixed to the chuck part of a tensile testing machine so that the distance between the chucks is 70 mm. The distance between the gauge marks is set to 20 mm, the test piece is pulled at a test speed of 300 mm / min, the load until the test piece breaks is measured, and the value obtained by dividing the maximum value by the cross-sectional area is defined as the tensile strength. In the explanatory drawing of the No. 3 dumbbell in Figure 4, the indicated numbers represent dimensions (unit: mm).

[0017] Examples of olefin-based thermoplastic elastomers (TPO) include ethylene-propylene-diene rubber dispersed polypropylene (PP+EPDM) and the like. Examples of urethane-based thermoplastic elastomers (TPU) include polyester-based TPU, polyether-based TPU, and the like. Examples of styrene-based thermoplastic elastomers (TPS) include styrene-ethylene-butylene-styrene block copolymer (SEBS), styrene-butadiene-styrene block copolymer (SBS), styrene-ethylene-propylene-styrene block copolymer (SEPS), styrene-isoprene-styrene block copolymer (SIS), and the like. Examples of ester-based thermoplastic elastomers include polyether ester-polyester block copolymer (TPC-EE), polyether ester block copolymer (TPC-ET), polyester block copolymer (TPC-ES), and the like. Examples of polyamide-based thermoplastic elastomers (TPAE) include polyamide-polyether ester-polyester block copolymer (TPA-EE), polyamide-polyester block copolymer (TPA-ES), polyamide-polyether ester block copolymer (TPA-ET), and the like. Among these, from the viewpoint of easily achieving both flexibility and tensile strength, the thermoplastic elastomer contained in the fiber (A) is preferably an olefin-based thermoplastic elastomer (TPO), a urethane-based thermoplastic elastomer (TPU), or a styrene-based thermoplastic elastomer (TPS), and more preferably contains a urethane-based thermoplastic elastomer (TPU). Further, as the urethane-based thermoplastic elastomer, a polyester-based TPU is more preferable.

[0018] When the fiber (A) contains components other than the thermoplastic elastomer (other components), the proportion of the thermoplastic elastomer with respect to the components (100% by mass) constituting the fiber (A) is preferably 80 to 99% by mass, more preferably 90 to 99% by mass, and particularly preferably 95 to 99% by mass from the viewpoint of flexibility. In one preferred embodiment, the fiber (A) may be a fiber composed only of a thermoplastic elastomer. That is, the proportion of the thermoplastic elastomer component in the components constituting the fiber (A) may be 100% by mass. The other components in the fiber (A) are not particularly limited, and examples thereof include polyolefins such as polyethylene and polypropylene, and polyesters. These other components may be used alone or in combination of two or more. When the fiber (A) contains other components, it is preferable to contain a polyolefin because the strength of the nonwoven fabric is likely to be improved.

[0019] The fiber diameter of the fiber (A) is preferably 1 to 40 μm, more preferably 5 to 30 μm, from the viewpoint of easily achieving both the strength and flexibility of the nonwoven fabric. The fiber diameter refers to a value calculated from the average value of the diameters of any 10 fibers (A) measured using a laser microscope.

[0020] The nonwoven fabric may contain fibers other than the fiber (A) (other fibers). When the nonwoven fabric contains other fibers, the proportion of the fiber (A) to the total mass of the fibers constituting the nonwoven fabric is preferably 80% by mass or more, more preferably 90% by mass or more. If the proportion of the fiber (A) to the total mass of the fibers constituting the nonwoven fabric is within the above range, the flexibility is likely to be good. In one preferred embodiment, the nonwoven fabric may be composed of only the fiber (A). The other fibers contained in the nonwoven fabric are not particularly limited. For example, polyolefin fibers such as polyethylene and polypropylene, aramid fibers, glass fibers, cellulose fibers, nylon fibers, vinylon fibers, polyester fibers, rayon fibers, etc. may be mentioned. These other fibers may be used alone or in combination of two or more. In one embodiment, the nonwoven fabric may be a mixed fiber of the fiber (A) and polyolefin fibers as other fibers. The other fibers preferably have a fiber diameter similar to that of the fiber (A). That is, the fiber diameter is preferably 1 to 40 μm, more preferably 5 to 30 μm. The fiber diameter of the other fibers can be determined by the same method as that of the fiber (A).

[0021] The nonwoven fabric may be provided with a fused part. The fused part is formed as a recessed part on the surface of the nonwoven fabric by the joining of the fibers constituting the nonwoven fabric. The fused part may be formed by mechanical treatment or may be formed by embossing. In one embodiment of the present invention, the fused part is preferably formed by thermally fusing the fibers constituting the nonwoven fabric by thermal embossing. By having such a fused part, the relaxation of the horizontal stress acting during abrasion becomes large, and the abrasion resistance is more likely to be improved. Also, it is easy to prevent the binding tape from stretching too much during the binding operation and the workability from deteriorating. Further, it is preferable that the fusion part is provided on the "surface of the non-woven fabric on which the resin layer is not laminated" (hereinafter referred to as "the other surface of the non-woven fabric"). That is, in one preferred embodiment, a resin layer may be laminated on one surface of the non-woven fabric, and a fusion part may be provided on the other surface of the non-woven fabric. The fusion part formed on the other surface of the non-woven fabric may be of one type or two or more types. Here, "two or more types of fusion parts" means that two or more fusion parts having different shapes are provided, two or more fusion parts having different sizes (areas) are provided, or they are mixed.

[0022] The shape of the fusion part is not particularly limited as long as it has the effects of the present invention. For example, circular shapes (true circles or ellipses), diamond shapes (rhombuses and shapes similar thereto (however, squares are not included)), square shapes (rectangles, squares, trapezoids, etc. including rounded squares), etc. may be mentioned. Among these, from the viewpoint of being more likely to improve the wear resistance and bundling workability of the binding tape, a circular shape or a square shape is preferable, and particularly preferably including a square. From the viewpoint of being more likely to improve the wear resistance and bundling workability, the area of the fusion part is preferably 0.5 to 4.0 mm 2 more preferably 0.8 to 3.8 mm 2 even more preferably 1.2 to 3.5 mm 2 and particularly preferably so. The fusion part may be randomly arranged on the other surface of the non-woven fabric, or may be arranged linearly or in a grid pattern. Among these, from the viewpoint of being more likely to improve the wear resistance, it is preferably arranged in a grid pattern. When the non-woven fabric is provided with a fusion part, the ratio of the total area of the fusion parts provided on the non-woven fabric is preferably 20 to 80% with respect to the total area of the other surface of the non-woven fabric, and more preferably 50 to 75%. If the total area of the fusion parts is within the above range, the wear resistance and bundling workability are more likely to be improved.

[0023] When the nonwoven fabric is provided with a fused portion, as described above, it is preferably formed by thermally fusing the fibers constituting the nonwoven fabric by thermal embossing. That is, it is preferably formed by sandwiching the nonwoven fabric between a thermal embossing roll having convex portions formed on its surface for forming the fused portion of the present invention and a flat roll and applying pressure. As the temperature during thermal embossing, for example, 100 to 150 °C is preferable, and 100 to 130 °C is more preferable.

[0024] Figure 2 is a laser microscopic photograph showing an example of the fused portion 1 provided on the surface of the nonwoven fabric 10 of the binding tape 100. In Figure 2, the square fused portions 1 are provided in a grid pattern on the surface (the other surface) of the nonwoven fabric 10.

[0025] <Resin layer> The resin layer is laminated on one surface of the nonwoven fabric. In one aspect, it is preferable that the resin layer is directly laminated on one surface of the nonwoven fabric. By including the base material layer including the nonwoven fabric and the resin layer, the abrasion resistance of the binding tape is improved. Also, it is possible to prevent the binding tape from stretching too much during the binding operation and deteriorating workability. Further, by providing the base material layer with a resin layer, it becomes easier to adjust the tensile elastic modulus in the MD direction and TD direction of the binding tape within the range of 0.08 to 1.5 MPa. The resin constituting the resin layer is not particularly limited as long as it has the effects of the present invention. From the viewpoint of being more likely to improve abrasion resistance, it preferably contains at least one resin selected from polyvinyl chloride (PVC), polypropylene (PP), polyethylene (PE), polyvinyl alcohol (PVA), and ethylene-vinyl acetate copolymer (EVA), and more preferably contains at least one resin selected from PVC and EVA. Note that these PVC, PP, PE, PVA, and EVA may contain a small amount of additives or comonomers as long as the effects of the present invention are not inhibited.

[0026] As the PVC, for example, those having an average degree of polymerization of 500 to 3000 are preferable, those having an average degree of polymerization of 700 to 2000 are more preferable, and those having an average degree of polymerization of 800 to 1500 are particularly preferable. The average degree of polymerization means a value calculated by dissolving 200 mg of the resin in 50 mL of nitrobenzene, measuring the specific viscosity of this polymer solution in a constant temperature bath at 30 °C using an Ubbelohde viscometer, and according to JIS-K6720-2. From the viewpoint of flexibility, the PVC may contain a plasticizer. As the plasticizer, phthalate plasticizers, isophthalate plasticizers, terephthalate plasticizers, adipate plasticizers and their polyester plasticizers, phosphate plasticizers, trimellitate plasticizers, epoxy plasticizers, etc. can be used. Specific examples of the plasticizer include diisononyl phthalate (DINP), diheptyl phthalate (DHP), di-2-ethylhexyl phthalate (DOP), di-n-octyl phthalate (n-DOP), diisodecyl phthalate (DIDP), di-2-ethylhexyl isophthalate (DOIP), di-2-ethylhexyl terephthalate (DOTP), benzyl butyl phthalate (BBP), tri-2-ethylhexyl trimellitate (TOTM), di-2-ethylhexyl adipate (DOA), tricresyl phosphate (TCP), benzyl octyl adipate (BOA), adipic acid-propylene glycol-based polyester, adipic acid-butylene glycol-based polyester, phthalic acid-propylene glycol-based polyester, diphenyl cresyl phosphate (DPCP), diisodecyl adipate, epoxidized soybean oil, epoxidized linseed oil, chlorinated paraffin, etc. These may be used alone or in combination of two or more. Among the above plasticizers, DINP, which is inexpensive and has a high plasticizing effect, is more preferable. When the PVC contains a plasticizer, its content is preferably 40 to 70 parts by mass, more preferably 50 to 65 parts by mass, and still more preferably 57 to 65 parts by mass with respect to 100 parts by mass of the polyvinyl chloride resin. In the PVC, inorganic fillers, modifiers, and other additives can be blended as long as they do not inhibit the effects of the present invention as necessary. Examples of the other additives include colorants, stabilizers, antioxidants, ultraviolet absorbers, lubricants, and the like. The blending amounts of these are arbitrary.

[0027] Examples of the PP include resins having isotactic or syndiotactic crystallinity. Further, the PP may be one in which a small amount of comonomer is copolymerized. Such PP may have a melting point in the range of 155 to 175 °C, preferably 160 to 170 °C, as measured by differential scanning calorimetry (DSC).

[0028] As the PVA, for example, PVA having a saponification degree of 70 to 90 mol% is preferable. As for the EVA, from the viewpoints of abrasion resistance and binding workability, those having an ethylene content in the range of 5 to 99%, preferably 10 to 98% are preferable.

[0029] Examples of the PE include low-density polyethylene (LDPE) and high-density polyethylene (HDPE). As the LDPE, for example, those having a density of 0.91 g / cm 3 or more and less than 0.95 g / cm 3 , preferably 0.93 to 0.94 g / cm 3 are included. As the HDPE, for example, those having a density of 0.95 g / cm 3 or more and 0.97 g / cm 3 or less, preferably 0.95 to 0.96 g / cm 3 are included. Further, those having a melting point in the range of 110 to 140 °C, preferably 120 to 135 °C, as measured by differential scanning calorimetry (DSC) may also be used.

[0030] The resin layer may be formed by impregnating or coating the nonwoven fabric with the aforementioned resin, or may be formed by laminating a film or sheet containing the aforementioned resin on the nonwoven fabric. When the resin layer is a layer formed by impregnating or coating the aforementioned resin on a nonwoven fabric, examples of the method for forming the resin layer include a method of coating with a gravure coater, comma coater, die coater, or the like. On the other hand, when forming a resin layer by laminating a film or sheet containing the aforementioned resin on a nonwoven fabric, the film or sheet is preferably, for example, a film or sheet obtained by extrusion film formation using a sheet extruder.

[0031] The laminated amount of the resin layer is preferably 20~350 g / m 2 more preferably 30~320 g / m 2 even more preferably 50~300 g / m 2 If the laminated amount of the resin layer is within the above range, the wear resistance is likely to be improved. Also, it is easier to balance flexibility and binding workability. In one aspect, the base material layer may be composed of only a nonwoven fabric and a resin layer.

[0032] The thickness of the base material layer is preferably 300~1200 μm, more preferably 300~600 μm. If the thickness of the base material layer is within the above range, the wear resistance and flexibility are likely to be good. The thickness of the base material layer means the average value measured at three locations using a dial gauge specified in JIS B 7503.

[0033] The base material layer may include a layer (intermediate layer) other than the aforementioned nonwoven fabric and resin layer. When providing an intermediate layer, it may be provided between the nonwoven fabric and the resin layer, or on the surface of the resin layer where the nonwoven fabric is not laminated.

[0034] (Adhesive layer) In the binding tape according to the present invention, the adhesive layer is provided on at least one surface of the base material layer. In particular, it is preferably directly laminated on the resin layer. The adhesive layer is preferably composed of an adhesive. The adhesive is not particularly limited as long as it has the effects of the present invention, and the adhesives conventionally used for binding tapes can be appropriately used. Specifically, as the adhesive, for example, an acrylic adhesive, a rubber adhesive, a silicone adhesive, a urethane adhesive, or the like can be used.

[0035] As the acrylic adhesive, for example, those mainly composed of an acrylic polymer can be used. Examples of the acrylic polymer include polymers of (meth)acrylic acid alkyl esters and carboxy group-containing unsaturated monomers. Note that “(meth)acrylic acid” means acrylic acid and methacrylic acid. Examples of the (meth)acrylic acid alkyl ester include methyl acrylate, methyl methacrylate, ethyl acrylate, ethyl methacrylate, n-propyl acrylate, n-propyl methacrylate, isopropyl acrylate, isopropyl methacrylate, n-butyl acrylate, n-butyl methacrylate, isobutyl acrylate, isobutyl methacrylate, sec-butyl acrylate, sec-butyl methacrylate, tert-butyl acrylate, tert-butyl methacrylate, 2-ethylhexyl acrylate, 2-ethylhexyl methacrylate, n-octyl acrylate, n-octyl methacrylate, isooctyl acrylate, isooctyl methacrylate, n-nonyl acrylate, n-nonyl methacrylate, isononyl acrylate, isononyl methacrylate, and the like. These may be used alone or in combination of two or more.

[0036] The carboxy group-containing unsaturated monomer is not particularly limited as long as it can copolymerize with the above (meth)acrylic acid alkyl ester and has the effects of the present invention. For example, acrylic acid, methacrylic acid, itaconic acid, fumaric acid, maleic acid, or the like can be used. These may be used alone or in combination of two or more.

[0037] The acrylic polymer can also be a copolymer containing monomers other than the alkyl (meth)acrylate and carboxy group-containing unsaturated monomers exemplified above. Examples of other monomers include hydroxyl group-containing monomers such as 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, and hydroxyhexyl (meth)acrylate; nitrogen-containing (meth)acrylates such as (meth)acrylamide, acryloylmorpholine, and (meth)acrylonitrile; vinyl acetate, styrene, vinylidene chloride, vinyl propionate, and the like. These may be used alone or in combination of two or more.

[0038] In one aspect of the present invention, when an acrylic pressure-sensitive adhesive is used as the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer, from the viewpoint of preventing the phenomenon (bleeding through) in which the low molecular weight components contained in the acrylic pressure-sensitive adhesive penetrate the nonwoven fabric of the base material layer, it is preferable that the acrylic polymer is crosslinked. Examples of the crosslinking method of the acrylic polymer include a method of irradiating active energy rays (ultraviolet rays, electron beams, etc.), a method of adding an arbitrary crosslinking agent, and the like. Examples of arbitrary crosslinking agents include epoxy-based crosslinking agents, polyfunctional isocyanate-based crosslinking agents, melamine resin-based crosslinking agents, metal salt-based crosslinking agents, metal chelate-based crosslinking agents, amino resin-based crosslinking agents, peroxide-based crosslinking agents, and the like. These may be used alone or in combination of two or more.

[0039] Examples of the rubber-based adhesive include those obtained by appropriately blending at least one rubber component selected from natural rubber (NR) and synthetic rubbers with at least one tackifier selected from the group consisting of rosin resins, terpene resins, petroleum resins, and the like. Examples of the synthetic rubber include at least one selected from the group consisting of styrene-isoprene-styrene block copolymer (SIS), styrene-butadiene-styrene block copolymer (SBS), hydrogenated products of the styrene-based block copolymers (SIPS, SEBS), styrene-butadiene rubber (SBR), polyisoprene rubber (IR), polyisobutylene (PIB), chloroprene rubber (CR), and butyl rubber (IIR). Among these, from the viewpoint of easily achieving both high adhesive strength and prevention of back glue residue, a combination of natural rubber (NR) and at least one synthetic rubber selected from SBR, CR, and IIR is preferable, and a combination of natural rubber (NR) and SBR is particularly preferable.

[0040] Examples of the silicone-based adhesive include those obtained by appropriately blending silicone rubber with silicone resin, silicone oil, and the like.

[0041] Examples of the urethane-based adhesive include those obtained by reacting polyols such as polyether-based polyols and polyester-based polyols with polyisocyanates such as tolylene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), hexamethylene diisocyanate (HDI), and xylylene diisocyanate (XDI).

[0042] The adhesive for forming the adhesive layer may contain any additives in the aforementioned adhesives. Examples of the additives include softeners, tackifiers, surface lubricants, leveling agents, antioxidants, corrosion inhibitors, light stabilizers, ultraviolet absorbers, heat stabilizers, polymerization inhibitors, silane coupling agents, lubricants, inorganic or organic fillers, metal powders, pigments, and the like. These may be used alone or in combination of two or more.

[0043] Examples of the pressure-sensitive adhesive include petroleum resins such as aliphatic copolymers, aromatic copolymers, aliphatic-aromatic copolymer systems, and alicyclic copolymers; coumarone-indene resins; terpene resins; terpene phenol resins; rosin resins such as polymerized rosin; (alkyl)phenol resins; xylene resins; and hydrogenated products thereof. These may be used alone or in combination of two or more.

[0044] In one aspect of the present invention, from the viewpoints of high adhesive strength and prevention of back glue residue, it is preferable to use a rubber-based pressure-sensitive adhesive as the pressure-sensitive adhesive for forming the adhesive layer. The laminated amount of the adhesive layer is preferably 10 to 100 g / m 2 more preferably 20 to 80 g / m 2 even more preferably 20 to 60 g / m 2 Particularly preferably. If the laminated amount of the adhesive layer is within the above range, the wear resistance and flexibility are more likely to be good. Further, the adhesive layer may be composed of a plurality of layers. When the adhesive layer is composed of a plurality of layers, it is preferable to adjust the total laminated amount of the adhesive layer so as to be within the above range.

[0045] In one aspect, the total thickness of the binding tape of the present invention is preferably 200 to 1300 μm, more preferably 240 to 1100 μm, and even more preferably 250 to 650 μm. The binding tape of the present invention having the above-described configuration is likely to have good flexibility and good binding workability even when the total thickness is in the range of 200 to 1300 μm. Also, in one aspect, from the viewpoint of more easily achieving both flexibility and high wear resistance, the total laminated amount (total laminated amount of the base material layer and the adhesive layer) of the binding tape is preferably 100 to 500 g / m 2 more preferably 200 to 460 g / m 2 even more preferably 250 to 450 g / m 2 Particularly preferably.

[0046] In one aspect, the binding tape according to the present invention preferably has a scrape wear resistance of 100 or more, more preferably 1000 or more, as measured in accordance with ISO6722. The scrape wear resistance specifically refers to the value measured by the following method. <Method for Measuring Scrape Wear Resistance> Attach a single layer of the binding tape with a width of 19 mm and a length of 50 mm along the longitudinal direction of a steel bar with a diameter of 10 mm. Next, bring a piano wire with a diameter of 0.45 mm into contact with the base material layer side of the binding tape, apply a load of 7 N, and reciprocate a distance of 15.5 mm in the longitudinal direction at a speed of 60 times per minute. At this time, the piano wire scrapes the binding tape, and the number of reciprocations until the binding tape penetrates is defined as the scrape wear resistance.

[0047] Also, in one aspect, the binding tape according to the present invention preferably has a tensile breaking strength in the MD direction of the binding tape of 20 N / 10 mm or more as measured in accordance with 8 of JIS Z0237(2000). If the tensile breaking strength in the MD direction of the binding tape is 20 N / 10 mm or more, the flexibility and binding workability of the binding tape are more likely to be better. The tensile breaking strength is more preferably 20 N / 10 mm or more and 70 N / 10 mm or less, further preferably 22 to 60 N / 10 mm, and particularly preferably 24 to 50 N / 10 mm. The tensile breaking strength in the MD direction of the binding tape specifically refers to the value measured by the following method. <Method for Measuring Tensile Breaking Strength in MD Direction of Binding Tape> In an environment of room temperature 23°C and relative humidity 50%RH, clamp and fix a test piece of the binding tape (width (length in TD direction) 19 mm, length (length in MD direction) 200 mm, thickness 0.2 to 1.3 mm) to the chuck part of a tensile testing machine so that the chuck distance is 100 mm. Then, pull the test piece at a speed of 300 mm / min, measure the load until the test piece breaks, and take the maximum value as the tensile breaking strength.

[0048] Note that the tensile breaking strength of the bundling tape in the TD direction is not particularly limited. From the viewpoint of easily preventing tape breakage due to bending of the bundled electric wires, the tensile breaking strength of the bundling tape in the TD direction may be 5 to 70 N / 10 mm, or may be 10 to 50 N / 10 mm.

[0049] [Manufacturing method of bundling tape] As a manufacturing method of the bundling tape according to the present invention, for example, a method including forming a resin film by a sheet extrusion method and laminating a resin on a non-woven fabric on one surface of the non-woven fabric by a thermal lamination method to form a base material layer including the non-woven fabric and the resin layer can be mentioned. When the non-woven fabric contains fibers (A) containing a thermoplastic elastomer, the method may include forming a non-woven fabric by a spunbond method or a meltblown method using fibers containing fibers (A) containing a thermoplastic elastomer, or preparing a non-woven fabric composed of fibers containing fibers (A). Further, when the non-woven fabric has a fused portion, the method may include a step of forming a fused portion on the other surface of the non-woven fabric by, for example, thermoembossing. After forming a base material layer including a non-woven fabric and a resin layer, the bundling tape can be manufactured by directly applying the above-mentioned adhesive to the base material layer to form an adhesive layer, or by transferring the adhesive applied to another sheet to the base material layer. Note that when the base material layer is composed of a non-woven fabric and a resin layer, it is preferable to directly apply the adhesive on the resin layer to form an adhesive layer. Examples of the method for applying the adhesive to the base material layer or another sheet include a roll coating method, a spray coating method, a gravure coating method, a reverse coating method, a rod coating method, a bar coating method, a die coating method, a kiss coating method, a reverse kiss coating method, an air knife coating method, and the like.

[0050] [Applications] As described above, the bundling tape of the present invention has high wear resistance, flexibility that allows wires to be bent, and excellent bundling workability. Therefore, it can be suitably used as a bundling tape for wires in fields such as automobiles where these performances are required. Of course, the bundling tape of this embodiment is not limited to bundling applications such as automobile wires.

[0051] Another more preferable aspect of the bundling tape of the present invention is a bundling tape having a base material layer including a non-woven fabric and a resin layer laminated on one surface of the non-woven fabric, and an adhesive layer, wherein the tensile elastic modulus in the longitudinal direction (MD direction) and the width direction (TD direction) of the bundling tape is 0.08 MPa or more, and the ratio (TD / MD) of the tensile elastic modulus in the longitudinal direction and the width direction of the bundling tape is 0.08 to 1.3. The tensile elastic modulus in the MD direction and TD direction of the bundling tape is preferably 1.5 MPa or less. The non-woven fabric preferably contains fiber (A) including a thermoplastic elastomer. Also, the basis weight of the non-woven fabric is 30 g / m 2 or more, and the laminated amount of the resin layer is more preferably 30 g / m 2 or more.

Examples

[0052] Hereinafter, the present invention will be described in detail with reference to examples, but the present invention is not limited by the following description.

[0053] [Example 1] (Preparation of base material layer) On one surface of a urethane non-woven fabric (trade name: “Espansion (registered trademark)”, manufactured by KB Seiren Co., Ltd.) with a fiber diameter of 20 μm, a basis weight of 100 g / m 2 and an apparent density of 0.33 g / m 3 , a PVC film extruded and formed with a sheet extruder (T-die width 500 mm, φ40 mm extruder, manufactured by Tanabe Machinery Plastic Co., Ltd.) was laminated by a thermal lamination method to form a resin layer, and a base material layer was obtained. The laminated amount of the resin layer was 130 g / m 2 . As the PVC constituting the resin layer, the following composition was used. (Composition of PVC resin) With respect to 100 parts by mass of PVC (homopolymer of vinyl chloride, average degree of polymerization 1300, product name: "TH-1300", manufactured by OCEAN VINYL CORPORATION), 58 parts by mass of DINP (manufactured by J-PLAS CO., LTD.), 2 parts by mass of epoxidized soybean oil (product name: "Chemizer SNE-50", manufactured by Sanwa Synthetic Chemical Co., Ltd.), 2 parts by mass of Ca-Zn-Mg based composite stabilizer (product name: "OW-5200", manufactured by Sakai Chemical Industry Co., Ltd.), and 28 parts by mass of calcium carbonate (product name: "Calcium's (registered trademark) P", manufactured by Kojima Chemical Industry Co., Ltd.) were blended.

[0054] (Production of binding tape) 10 parts by mass (solid content) of natural rubber latex (product name: "HA LATEX", manufactured by REDITECH CO., LTD.), 40 parts by mass (solid content) of styrene-butadiene rubber latex (product name: "T-093A", manufactured by JSR Corporation), and 50 parts by mass (solid content) of petroleum resin-based emulsion tackifier (product name: "AP-1100-NT", manufactured by Arakawa Chemical Industries, Ltd.) were mixed to prepare a rubber-based adhesive emulsion. Next, a binding tape was obtained by forming an adhesive layer on the resin layer of the base material layer (i.e., the surface on the side where the non-woven fabric is not laminated) by the comma coater method. The laminated amount of the adhesive layer was 40 g / m 2 It was. The total laminated amount of the obtained binding tape was 270 g / m 2 It was, and the total thickness was 440 μm. Also, the tensile elastic modulus in the MD direction and TD direction of the binding tape was measured by the following method. The tensile elastic modulus in the MD direction of the binding tape of Example 1 was 0.15 MPa, and the tensile elastic modulus in the TD direction was 0.16 MPa. (Tensile elastic modulus in the MD direction and TD direction of the binding tape) A binding tape test piece with a width of 19 mm and a length of 200 mm was prepared and fixed by clamping it between the chucks of a tensile testing machine so that the distance between the chucks was 100 mm. In an environment of room temperature 23°C and relative humidity 50%RH, the test piece was pulled at a speed of 300 mm / min, and the tensile stress and strain were measured. The ratio of the tensile stress to the strain between 5% and 10% strain was taken as the tensile modulus of elasticity, which was calculated by linear regression. In the measurement of the MD direction of the binding tape, the "width" of the test piece means the length in the TD direction, and the "length" means the length in the MD direction. Also, in the measurement of the TD direction of the binding tape, the "width" of the test piece means the length in the MD direction, and the "length" means the length in the TD direction. Also, the abrasion resistance, flexibility, binding workability, and tensile breaking strength in the MD direction of the obtained binding tape were evaluated according to the following procedures. The results are shown in Table 1.

[0055] <Evaluation of Abrasion Resistance> A binding tape with a width of 19 mm and a length of 50 mm was pasted in one layer along the longitudinal direction of a steel bar with a diameter of 10 mm. A piano wire with a diameter of 0.45 mm was brought into contact with the non-woven fabric side of the binding tape, and a load of 7 N was applied under the conditions of 23°C and humidity 50%RH, and the binding tape was reciprocated in the longitudinal direction over a distance of 15.5 mm at a speed of 60 times / min. At this time, the piano wire scraped the binding tape, and the number of reciprocations until the binding tape penetrated was taken as the number of scrape abrasion resistance times. Also, the abrasion resistance was evaluated according to the following evaluation criteria, and a grade of B or above was considered qualified (having high abrasion resistance). In the following evaluation criteria, a binding tape with an A evaluation (number of scrape abrasion resistance times of 1000 or more) has the abrasion resistance of class D in the European automotive standard LV312. (Evaluation Criteria) A: The number of scrape abrasion resistance times is 1000 or more. B: The number of scrape abrasion resistance times is 100 or more and less than 1000. C: The number of scrape abrasion resistance times is less than 100.

[0056] <Evaluation of Flexibility> In accordance with JIS K7171(2016)(ISO 178:2010), the three-point bending load of the test piece was measured. Specifically, as shown in Figure 3, seven automotive thin wires 200 with a diameter of 1 mm (product name: "AVS050", manufactured by Sumitomo Electric Wiring Systems, Ltd.) cut to a length of 300 mm were half-lapped with a bundling tape 100 to prepare a test piece X. Next, a pushing jig connected to a load cell 400 was applied to the central part of the test piece X supported by support bases 300 arranged at 100 mm intervals, and it was pushed in until the displacement amount reached 30 mm, and the maximum load at that time was measured. The bending load was measured under the following measurement conditions. In addition, the flexibility was evaluated in accordance with the following evaluation criteria, and B or above was considered qualified (excellent flexibility). (Measurement conditions) Measurement environment: Temperature 23°C, humidity 50%RH Test speed: 100 mm / min (Evaluation criteria) A: The three-point bending load is less than 4.0 N. B: The three-point bending load is 4.0 N or more and less than 5.0 N. C: The three-point bending load is 5.0 N or more.

[0057] (Evaluation of bundling workability) A roll-shaped bundling tape with a width of 19 mm wound around a 1.3-inch paper tube for 15 m was prepared, and seven automotive thin wires 200 with a diameter of 1 mm (product name: "AVS050", manufactured by Sumitomo Electric Wiring Systems, Ltd.) were half-lapped with the bundling tape to evaluate the bundling workability. In addition, the bundling workability was evaluated in accordance with the following evaluation criteria, and B or above was considered qualified (good bundling workability). (Evaluation criteria) A: The bundling tape did not stretch during the bundling operation, and it was easy to bundle the object. B: The bundling tape stretched slightly during the bundling operation, but the object could be bundled. C: The bundling tape stretched during the bundling operation, making it difficult to bundle the object.

[0058] (Tensile breaking strength of the bundling tape in the MD direction) Under the environment of room temperature 23°C and relative humidity 50%RH, the obtained binding tape was cut into test pieces with a width (length in the TD direction) of 19 mm and a length (length in the MD direction) of 200 mm. Next, after clamping and fixing the test piece to the chuck part of the tensile testing machine so that the distance between the chucks was 100 mm, it was pulled at a speed of 300 mm / min, and the load until the test piece broke was measured, and the maximum value was taken as the tensile breaking strength.

[0059] [Examples 2 to 10 and Comparative Example 1] Binding tapes were prepared in the same manner as in Example 1, except that the configurations of the nonwoven fabric and the resin layer were as shown in Table 1. Also, for the binding tapes of each example, the tensile elastic moduli in the MD direction and TD direction of the binding tapes were measured in the same manner as in Example 1. Further, the abrasion resistance, flexibility, binding workability, and tensile breaking strength in the MD direction were evaluated in the same manner as in Example 1. The results are shown in Table 1.

[0060] [Example 11] Urethane nonwoven fabric (product name: "Espansion", manufactured by KB Seiren Co., Ltd.) with a fiber diameter of 20 μm, basis weight of 100 g / m 2 , apparent density of 0.33 g / m 3 On the surface of the nonwoven fabric, fusion parts were formed by an embossing method. The shape of the fusion part was square, and its area was 2.8 mm 2 . The fusion parts were formed in a grid pattern on the surface of the nonwoven fabric. Also, the total area of the fusion parts with respect to the surface area of the nonwoven fabric (total surface area of the surface provided with the fusion parts) was 69%. Next, a resin layer was formed on the side surface of the nonwoven fabric where no fusion part was provided in the same manner as in Example 1 to obtain a base material layer. The resin layer was composed of the same PVC resin as in Example 1, and its laminated amount was 130 g / m 2 . Then, an adhesive layer was formed in the same manner as in Example 1 to obtain a binding tape. The adhesive used was the same rubber-based adhesive as in Example 1, and the laminated amount of the adhesive layer was 40 g / m 2 . The total laminated amount of the obtained binding tape was 270 g / m 2It was 440 μm in total thickness. Also, the tensile elastic moduli in the MD direction and TD direction of the bundling tape were measured in the same manner as in Example 1. Furthermore, the abrasion resistance, flexibility, bundling workability, and tensile breaking strength in the MD direction of the obtained bundling tape were evaluated in the same manner as in Example 1. The results are shown in Table 1.

[0061] [Comparative Example 2] A bundling tape was produced in the same manner as in Example 1 except that no resin layer was provided. The tensile elastic moduli in the MD direction and TD direction of the obtained bundling tape were measured in the same manner as in Example 1. Furthermore, the abrasion resistance, flexibility, bundling workability, and tensile breaking strength in the MD direction of the obtained bundling tape were evaluated in the same manner as in Example 1. The results are shown in Table 1.

[0062] In Table 1, "NR / SBR" means natural rubber (NR) and synthetic rubber (styrene-butadiene rubber (SBR)). The adhesives (NR / SBR) in Examples 2 to 11 and Comparative Examples 1 to 2 were the same adhesives as those used in Example 1. Also, in Table 1, "PET" means polyethylene terephthalate-based fiber (fiber diameter 10 μm). For "PVC" in Examples 2 to 9, 11, and Comparative Example 1, the same PVC resin as in Example 1 was used. Also, for "TPO" in Example 8, "TPS" in Example 9, and "EVA" in Example 10, the following compositions were used. (TPO) Fibers with a fiber diameter of 20 μm, consisting of ethylene propylene diene rubber dispersed polypropylene (TPO, trade name: "EXCELINK (registered trademark) 1300B", manufactured by JSR Corporation), which is an olefin-based thermoplastic elastomer. (TPS) Fibers with a fiber diameter of 10 μm, consisting of styrene-ethylene-butylene-styrene block copolymer (SEBS) (TPS, trade name: "Tuftec (registered trademark) H1043", manufactured by Asahi Kasei Corporation), which is a styrene-based thermoplastic elastomer. (EVA) An EVA resin with an ethylene content of 18% (product name: "Denka EVA Tex (registered trademark)", manufactured by Denka Co., Ltd.).

[0063]

Table 1

[0064] As shown in Table 1, the binding tapes of Examples 1 to 11 that satisfy the configuration of the present invention had high wear resistance, flexibility that allows wires to be bent, and good binding workability. Furthermore, it was found that the binding tapes of Examples 3, 5, and 7 also had excellent wear resistance corresponding to Class D of the European automotive standard LV312. On the other hand, the binding tape of Comparative Example 1, whose tensile elastic modulus in the MD direction and TD direction of the binding tape exceeded 1.5 MPa, had good wear resistance and binding workability, but low flexibility. Also, the binding tape of Comparative Example 2, whose tensile elastic modulus in the MD direction and TD direction of the binding tape was less than 0.08 MPa, had good flexibility, but the tape stretched too much during the binding operation, making it difficult to bind the object. Also, its wear resistance was low. From the above results, it was confirmed that the binding tape of the present invention has high wear resistance, flexibility that allows wires to be bent, and is excellent in binding workability.

Explanation of Signs

[0065] 1: Fused part 10: Non-woven fabric 20: Resin layer 30: Adhesive layer 40: Base material layer 100: Binding tape 200: Wire 300: Support base 400: Load cell

Claims

1. A bundling tape comprising a base material layer including a non-woven fabric and a resin layer laminated on one surface of the non-woven fabric, and an adhesive layer laminated directly on the resin layer, wherein the laminated amount of the resin layer is 50 to 350 g / m ２ and the tensile elastic modulus in the longitudinal direction and the width direction of the bundling tape is 0.08 to 1.5 MPa.

2. The areal density of the non-woven fabric is 20 to 350 g / m ２ The bundling tape according to claim 1.

3. The bundling tape according to claim 1 or 2, wherein the non-woven fabric contains fibers (A) containing a thermoplastic elastomer.

4. The bundling tape according to claim 3, wherein the thermoplastic elastomer contains at least one selected from an olefin-based thermoplastic elastomer, a urethane-based thermoplastic elastomer, and a styrene-based thermoplastic elastomer.

5. The bundling tape according to any one of claims 1 to 4, wherein the resin layer contains at least one resin selected from polyvinyl chloride and an ethylene-vinyl acetate copolymer.

6. The bundling tape according to any one of claims 1 to 5, wherein the non-woven fabric has a fused portion.

7. The fused portion is provided on the other surface of the non-woven fabric where the resin layer is not laminated, and the ratio of the total area of the fused portion is 20 to 80% with respect to the total area of the other surface of the non-woven fabric. The bundling tape according to claim 6.

8. The bundling tape according to any one of claims 1 to 7, which is for bundling electric wires.

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