binding tape

Abstract

[Problem] To provide a binding tape which has high wear resistance, while exhibiting good hand tearability. [Solution] A binding tape which comprises: a base material layer that contains a nonwoven fabric and a resin layer that is superposed on one surface of the nonwoven fabric; and an adhesive layer. With respect to this binding tape, the nonwoven fabric is provided with at least two fusion parts that have different shapes; and the tear load of the binding tape in the width direction as determined in accordance with JIS K 7128-2 is 30 N or less. It is preferable that the binding tape has a scrape abrasion resistance of 100 or more cycles as determined in accordance with ISO 6722.

Description

[Technical Field]

[0001] The present invention relates to a binding tape. [Background technology]

[0002] In wiring for automobiles and the like, electrical wires are bundled into a predetermined shape with bundling tape. Tapes for bundling electrical wires are required to have excellent abrasion resistance in order to prevent the electrical wires from coming into contact with surrounding walls or interior materials and being damaged. On the other hand, from the viewpoint of workability when bundling electrical wires, good hand-tearability is also required. "Hand-tearability" refers to the ability to easily cut the tape by hand without using a tool such as a cutter. As bundling tapes with high abrasion resistance, for example, bundling tapes using polyethylene terephthalate (PET) knitted fabric as a substrate, bundling tapes having a substrate in which a nonwoven fabric having a specific thickness is bonded to a resin film, etc. have been proposed (for example, Patent Documents 1 and 2, etc.). However, these bundling tapes are difficult to tear by hand, and require the use of a special tool to cut the tape, which increases the labor required for bundling.

[0003] As a bundling tape that combines abrasion resistance and ease of hand tearing, Patent Document 3 proposes a wire protection material that includes a three-layer structure of a substrate and an adhesive layer formed by bonding two sheets of fabric material with an adhesive. Patent Document 4 also proposes a bundling tape that includes a fiber layer with a woven or knitted fabric sandwiched between two sheets of abrasion-resistant resin film, and an adhesive layer. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-154634 [Patent Document 2] Japanese Patent Application Laid-Open No. 2009-137296 [Patent Document 3] Japanese Patent Application Laid-Open No. 2010-225327 [Patent Document 4] Japanese Patent Application Laid-Open No. 2019-119458 Summary of the Invention [Problem to be solved by the invention]

[0005] However, the wire protection materials or bundling tapes described in Patent Documents 3 and 4 do not sufficiently achieve both abrasion resistance and ease of tearing by hand. In recent years, there has been a demand for higher abrasion resistance in wiring applications such as automobiles. That is, there is a demand for bundling tapes that can withstand 100 or more scrape abrasion tests. However, conventional bundling tapes have the problem of not being able to pass the abrasion test. SUMMARY OF THE INVENTION An object of the present invention is to provide a binding tape that has high abrasion resistance and is easily torn by hand. [Means for solving the problem]

[0006] In response to the above problems, the inventors of the present application conducted extensive research and discovered that all of the above problems can be solved by providing a binding tape having a nonwoven fabric with a specific fused portion, a base layer with a resin layer, and an adhesive layer, and by setting the tear load in the width direction of the binding tape to within a specific range, thereby completing the present invention. That is, the present invention has the following aspects. [1] A bundling tape having a base layer including a nonwoven fabric and a resin layer laminated on one side of the nonwoven fabric, and an adhesive layer, wherein the nonwoven fabric has fused portions having at least two different shapes, and the tear load in the width direction of the bundling tape measured in accordance with JIS K7128-2 is 30 N or less. [2] The binding tape described in [1], which has a scrape abrasion resistance of 100 or more times as measured in accordance with ISO 6722. [3] The binding tape according to [1] or [2], wherein the tear load in the width direction of the binding tape is 3N or more. [4] The total lamination amount of the binding tape is 100 to 400 g / m 2The binding tape according to any one of [1] to [3], [5] A binding tape according to any one of [1] to [4], wherein the nonwoven fabric is a spunbond nonwoven fabric. [6] A binding tape described in any one of [1] to [5], wherein the fused portion includes fused portion 1 and fused portion 2 having different areas, and at least one of fused portion 1 and fused portion 2 is arranged parallel to the width direction of the binding tape. [7] A binding tape according to any one of [1] to [6], which is used for binding electric wires or the like. [Effects of the Invention]

[0007] According to the present invention, a binding tape having high abrasion resistance and good hand tearability can be provided. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a cross-sectional view showing one embodiment of the binding tape of the present invention. [Figure 2] 1 is an optical microscope photograph showing an example of the binding tape of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0009] The present invention will be described in detail below, but the present invention is not limited to the following embodiments. [Binding tape] The binding tape of the present invention comprises a base layer including a nonwoven fabric and a resin layer laminated on one side of the nonwoven fabric, and an adhesive layer. The nonwoven fabric has fused portions with at least two different shapes, and the binding tape has a tear load in the width direction measured according to JIS K7128-2 (corresponding ISO standard: ISO 9033-2:1983) of 30 N or less. Such a binding tape has high abrasion resistance and good hand-tearability. In this specification, "hand-tearability" refers to the ability of the binding tape to be easily torn in the width direction by hand without using a dedicated tool. In this specification, "width direction" refers to the direction perpendicular to the direction (length direction) in which the binding tape is unwound from a roll. In this specification, "width direction" is sometimes referred to as "TD direction," and the length direction is sometimes referred to as "MD direction." The tear load in the width direction of the binding tape specifically refers to a value measured under the following conditions. <Method for measuring tearing load> A 9mm slit is made across the width of a 19mm wide, 75mm long binding tape in the center of its length. The tape is then clamped and secured in the specimen chuck of an Elmendorf tester (No. 163, manufactured by Toyo Seiki Co., Ltd.) so that the width is parallel to the ground. Under conditions of 23°C temperature and 50% RH, a 2.4kg fan-shaped pendulum is dropped under its own weight from a position at a 70° swing angle starting from the ground, tearing the test specimen. The value on the scale at this time is read, and the load required for tearing is calculated. In one embodiment, the tear load in the width direction of the binding tape, measured in accordance with JIS K7128-2 (corresponding ISO standard: ISO6383-2:1983), is preferably 3N or more and 30N or less, more preferably 5 to 25N, and particularly preferably 5 to 20N.

[0010] In one embodiment, the binding tape of the present invention preferably has a scrape abrasion resistance of 100 or more times, more preferably 1000 or more times, as measured in accordance with ISO 6722. The scrape abrasion resistance specifically refers to a value measured by the following method. <Method for measuring scrape abrasion resistance> A layer of binding tape measuring 19 mm wide and 50 mm long is attached longitudinally to a 10 mm diameter steel rod. Next, a 0.45 mm diameter piano wire is placed in contact with the base layer of the binding tape, and a load of 7 N is applied, causing it to reciprocate longitudinally over a distance of 15.5 mm at a speed of 60 times per minute. The piano wire scrapes the binding tape, and the number of reciprocations until the binding tape is penetrated is the scrape abrasion resistance count.

[0011] (base material layer) The base layer of the binding tape of the present invention includes a nonwoven fabric and a resin layer laminated on one side of the nonwoven fabric, and the nonwoven fabric has fused portions with at least two different shapes.

[0012] <Nonwoven fabric> The nonwoven fabric has fused portions with at least two different shapes. The fused portions are formed as depressions on the surface of the nonwoven fabric by bonding the fibers that make up the nonwoven fabric together. The fused portions may be formed by mechanical processing or embossing. In one aspect of the present invention, the fused portions are preferably formed by thermally fusing the fibers of the nonwoven fabric using thermal embossing. By having such fused portions, the tear load in the TD direction of the binding tape is 30 N or less, improving the hand-tearability of the binding tape. Furthermore, horizontal stress relaxation that occurs during wear is increased, improving wear resistance. The fused portions are preferably provided on the "surface of the nonwoven fabric on which the resin layer is not laminated" (hereinafter referred to as "the other surface") of the nonwoven fabric. That is, in one preferred embodiment, a resin layer may be laminated on one surface of the nonwoven fabric, and fused portions having at least two different shapes may be provided on the other surface of the nonwoven fabric. In the present invention, "fused portions having different shapes" includes not only fused portions having different shapes but also fused portions having different sizes (areas). The fused portions of the nonwoven fabric may be fused portions having different areas, fused portions having different shapes, or a mixture of these. The shape of the fused portion is not particularly limited as long as it has the effects of the present invention, and examples thereof include a circle (a perfect circle or an ellipse), a diamond (a diamond or a shape similar thereto (but excluding a square)), a quadrangle (a rectangle, a square, a trapezoid, etc., including a quadrangle with rounded corners), etc. Of these, from the viewpoint of more easily achieving both hand tearability and abrasion resistance, a circle or a quadrangle is preferred, and an ellipse, a rectangle, or a combination thereof is more preferred.

[0013] (Fusing parts 1 and 2) In one embodiment, the fused portion includes fused portion 1 and fused portion 2 having different areas, and it is preferable that the area of ​​fused portion 1 is smaller than the area of ​​fused portion 2. In this way, by including fused portions 1 and 2 having different areas, the tear load in the TD direction of the binding tape is more likely to be 30 N or less, and as a result, hand tearability is more likely to be improved. The area of ​​the fused portion 1 is 0.01 to 0.5 mm 2 is preferable, and 0.1 to 0.4 mm 2 is more preferable. The area of ​​fused portion 2 is not particularly limited as long as it is larger than fused portion 1 and the effect of the present invention is achieved. In one preferred embodiment, the area is preferably 1.5 to 8 times, and more preferably 2 to 4 times, the area of ​​fused portion 1. That is, the area ratio of fused portion 2 to fused portion 1 (area of ​​fused portion 1: area of ​​fused portion 2) is preferably 1:1.5 to 1:8, and more preferably 1:2 to 1:4. Furthermore, when the area of ​​fused portion 1 is 0.1 to 0.4 mm as described above, 2 In this case, the area of ​​the fused portion 2 is, for example, 0.15 to 3.2 mm 2 is preferable, and 0.2 to 1.6 mm 2 is more preferred. The shapes of fused parts 1 and 2 may be the same or different. It is preferable that fused parts 1 and 2 have the same shape, as this makes them easier to tear by hand. In other words, it is more preferable that fused parts 1 and 2 have the same shape but different areas. Note that "fused parts 1 and 2 have the same shape" means, for example, that if fused part 1 is rectangular, fused part 2 is also rectangular, and the ratio of the long side to the short side of the rectangle may be the same or different. The shape of the fused parts 1 and 2 is preferably a circle or a square, and more preferably an oval or a rectangle. In one preferred embodiment, at least one of fused portions 1 and 2 is preferably arranged so that its long side (or major axis) is parallel to the TD direction of the binding tape. In a more specific embodiment, fused portions 1 and 2 are preferably rectangular or elliptical in shape, with the long side of the rectangle or the major axis of the ellipse being parallel to the TD direction of the binding tape. With this configuration, the tear load of the binding tape in the TD direction can be easily reduced to 30 N or less, further improving the hand-tearability of the binding tape. Furthermore, it is particularly preferred that both fused portions 1 and 2 are arranged so that they are parallel to the TD direction of the binding tape. In one embodiment, when fused portions 1 and 2 are each rectangular, the ratio of the long side to the short side of the rectangle (long side:short side) is preferably 1.5:1 to 8:1, and more preferably 3:1 to 6:1. In order to prevent the tape from easily breaking after bundling, it is preferable that the tape has a certain degree of strength in the MD. The bundling tape of the present invention has good hand tearability in the TD direction of the tape, but is difficult to cut in the MD direction.

[0014] In one embodiment, the distance between fused portions 1 in the width direction of the binding tape (hereinafter referred to as "TD1") is preferably 0.1 to 1.5 mm, more preferably 0.3 to 1.3 mm, and particularly preferably 0.5 to 1.1 mm. Furthermore, the distance between fused portions 2 in the width direction of the binding tape (hereinafter referred to as "TD2") is preferably 1.0 to 5.0 mm, more preferably 1.0 to 4.5 mm, and particularly preferably 2.5 to 4.5 mm. When TD1 or TD2 is within the above range, hand tearability tends to be improved. Furthermore, in one embodiment, TD1 is more preferably 0.8 mm, and TD2 is more preferably 2.7 to 4.5 mm. TD1 refers to the distance between two fused portions 1 aligned in the TD direction of the binding tape. The same applies to TD2. TD1 and TD2 can be measured using an optical microscope. Furthermore, when fused portions 1 and 2 are formed by embossing, the distance between the convex portions corresponding to fused portion 1 of the embossing roll or the distance between the convex portions corresponding to fused portion 2 can be adjusted to fall within the above range. The fused portions 1 and 2 may be arranged randomly on the nonwoven fabric, or may be arranged in a linear or lattice pattern. From the viewpoint of improving hand tearability, it is more preferable that they are arranged in a linear pattern parallel to the TD direction of the binding tape. Furthermore, it is particularly preferable that the fused portions 1 and 2 are arranged as independent linear fused portions (i.e., a single linear fused portion group contains only fused portions 1 and 2) and are arranged in a parallel direction to the TD direction. When the fused portions 1 and 2 are arranged as independent linear fused portions, the distance in the MD between the linear fused portion group composed of the fused portions 1 and the linear fused portion group composed of the fused portions 2 may be 0.1 to 3 mm or 0.4 to 1.8 mm. The nonwoven fabric may include fused portions other than the fused portions 1 and 2. The nonwoven fabric has at least two types of fused portions, preferably two to five types, and particularly preferably two to three types.

[0015] Fig. 1 is a cross-sectional view showing one embodiment of the binding tape of the present invention. The binding tape 100 of Fig. 1 has a configuration in which a nonwoven fabric 10, a resin layer 20, and an adhesive layer 30 are laminated in this order. Fig. 2 is an optical microscope photograph showing an example of the binding tape of the present invention. Fig. 2 is an optical microscope photograph of the surface of the binding tape 100 having the configuration of Fig. 1, on which the fused portion of the nonwoven fabric 10 is provided. In Figure 2, the vertical direction is the MD direction of the binding tape 100, and the horizontal direction is the TD direction. Rectangular fused portions 1 and 2 are provided on the surface of the nonwoven fabric 10. The long sides of the rectangles of fused portions 1 and 2 are linear and parallel to the width direction of the binding tape 100. As shown in Figure 2, in the binding tape 100, the widthwise distance between the linearly arranged fused portions 1 is TD1. Similarly, the widthwise distance between the linearly arranged fused portions 2 is TD2.

[0016] The nonwoven fabric used in the base layer is not particularly limited as long as it has the effects of the present invention, and for example, a nonwoven fabric made by a spunbond method, a nonwoven fabric made by a spunlace method, a nonwoven fabric made by a meltblown method, etc. can be used. The nonwoven fabric may be a single layer, or a laminated nonwoven fabric made of multiple layers. In the case of a laminated nonwoven fabric, it may be a laminate of nonwoven fabrics made by multiple methods. Among these, from the viewpoint of mechanical strength, it is preferable to use a nonwoven fabric made by a spunbond method (spunbonded nonwoven fabric). The weight of the nonwoven fabric is 50 to 200 g / m 2 Preferably, the thickness is 60 to 140 g / m 2 If the basis weight of the nonwoven fabric is within the above range, the abrasion resistance is likely to be improved while suppressing an increase in the tape weight. In addition, the porosity is preferably 40 to 90%. The apparent density is 0.1 to 0.4 g / cm 3 is preferred, and 0.2 to 0.4 g / cm 3 If the apparent density of the nonwoven fabric is within the above range, the flexibility of the bound product tends to be good while maintaining high abrasion resistance.

[0017] The fibers constituting the nonwoven fabric are not particularly limited as long as they achieve the effects of the present invention, and examples thereof include aramid fibers, glass fibers, cellulose fibers, nylon fibers, vinylon fibers, polyester fibers, polyolefin fibers, and rayon fibers. These may be used alone or in combination of two or more. Of these, polyester fibers or polyolefin fibers are preferred, and polyester fibers are more preferred, as they tend to achieve both high abrasion resistance and ease of hand tearing and also tend to improve heat resistance. The fiber diameter of the fibers constituting the nonwoven fabric is preferably 3 to 30 μm, more preferably 5 to 20 μm, because this makes it easier to achieve both high abrasion resistance and ease of hand tearing. If the fiber diameter of the nonwoven fabric is within this range, it becomes easier to obtain high abrasion resistance while maintaining the flexibility of the bound product.

[0018] <Resin layer> The resin layer is laminated on one surface of the nonwoven fabric. In one embodiment, the resin layer is preferably laminated directly on one surface of the nonwoven fabric. When the base layer contains the nonwoven fabric and the resin layer, the abrasion resistance of the binding tape is improved. The resin constituting the resin layer is not particularly limited as long as it achieves the effects of the present invention. Because abrasion resistance is more likely to be improved, the resin layer 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 is composed of at least one resin selected from PVC, PP, and PE. These PVC, PP, PE, PVA, and EVA may contain small amounts of additives or comonomers as long as they do not impair the effects of the present invention.

[0019] The PVC preferably has an average degree of polymerization of, for example, 500 to 3000, more preferably 700 to 2000, and particularly preferably 800 to 1500. The average degree of polymerization refers to a value calculated in accordance with JIS-K6720-2 by dissolving 200 mg of resin in 50 mL of nitrobenzene and measuring the specific viscosity of the polymer solution in a 30°C thermostatic bath using an Ubbelohde viscometer. PVC may contain a plasticizer in order to improve ease of hand tearing and flexibility. Examples of the plasticizer that can be used include phthalic acid-based plasticizers, isophthalic acid-based plasticizers, terephthalic acid-based plasticizers, adipic acid-based plasticizers and their polyester-based plasticizers, phosphoric acid-based plasticizers, trimellitic acid-based plasticizers, and epoxy-based plasticizers. Specific examples of plasticizers 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), and azidopropyl phthalate (AZP). Examples of suitable plasticizers include di-2-ethylhexyl adipate (DOA), tricresyl phosphate (TCP), benzyl octyl adipate (BOA), adipic acid-propylene glycol polyester, adipic acid-butylene glycol polyester, phthalic acid-propylene glycol polyester, diphenyl cresyl phosphate (DPCP), diisodecyl adipate, epoxidized soybean oil, epoxidized linseed oil, and chlorinated paraffin. These may be used alone or in combination of two or more. Among the above plasticizers, DINP is more preferred because it is inexpensive and has a high plasticizing effect. When the PVC contains a plasticizer, the content thereof is preferably 40 to 70 parts by mass, more preferably 50 to 65 parts by mass, and even more preferably 57 to 65 parts by mass, relative to 100 parts by mass of the polyvinyl chloride resin. If necessary, inorganic fillers, modifiers, and other additives can be blended into the PVC within a range that does not impair the effects of the present invention. Examples of other additives include colorants, stabilizers, antioxidants, UV absorbers, and lubricants. The amounts of these additives blended are optional.

[0020] Examples of PP include resins having isotactic or syndiotactic crystallinity. PP may also be copolymerized with a small amount of comonomer. Such PP may have a melting point, as measured by differential scanning calorimetry (DSC), in the range of 155 to 175°C, preferably 160 to 170°C.

[0021] As the PVA, for example, PVA having a degree of saponification of 70 to 90 mol % is preferred. In addition, from the viewpoint of abrasion resistance and ease of hand tearing, the EVA preferably has an ethylene content in the range of 5 to 99%, more preferably 10 to 98%.

[0022] Examples of PE include low-density polyethylene (LDPE) and high-density polyethylene (HDPE). LDPE has a density of 0.91 g / cm3. 3 More than 0.95g / cm 3 less than 0.93 to 0.94 g / cm 3 In addition, HDPE includes, for example, those having a density of 0.95 g / cm 3 More than 0.97g / cm 3 or less, preferably 0.95 to 0.96 g / cm 3 The melting point as measured by differential scanning calorimetry (DSC) may be in the range of 110 to 140°C, preferably 120 to 135°C.

[0023] The resin layer may be formed by impregnating or coating the nonwoven fabric with the resin described above, or may be formed by laminating a film or sheet containing the resin described above onto the nonwoven fabric. When the resin layer is a layer formed by impregnating or coating the nonwoven fabric with the above-mentioned resin, examples of a method for forming the resin layer include coating methods using a gravure coater, a comma coater, a die coater, or the like. On the other hand, when a resin layer is formed by laminating a film or sheet containing the above-mentioned resin on a nonwoven fabric, the film or sheet is preferably a film or sheet obtained by extrusion film formation using a sheet extruder, for example. In one embodiment, from the viewpoint of ease of hand tearing, the resin layer is preferably a film or sheet containing PVC. In one embodiment, the lamination amount of the resin layer is 10 to 200 g / m 2 is preferred, and 70 to 180 g / m 2 More preferably, 100 to 150 g / m 2 When the amount of the resin layer is within the above range, it is easier to achieve both hand-tearability and high abrasion resistance. In one embodiment, the substrate layer may be composed of only a nonwoven fabric and a resin layer. The thickness of the substrate layer is preferably 300 to 600 μm, and more preferably 300 to 500 μm. When the thickness of the substrate layer is within this range, it is easier to achieve both hand tearability and high abrasion resistance. The thickness of the substrate layer is measured at three locations using a dial gauge as specified in JIS B 7503 and refers to the average value. When the substrate layer is composed only of a nonwoven fabric and a resin layer, the thickness of the substrate layer refers to the value measured using a dial gauge at a portion of the nonwoven fabric where no fused portions are provided.

[0024] In the binding tape of the present invention, the fused portion provided on the base layer is preferably formed by thermally fusing the fibers constituting the nonwoven fabric by thermal embossing, as described above. That is, it is preferably formed by sandwiching the nonwoven fabric between a flat roll and a thermal embossing roll having protrusions formed on its surface for forming the fused portion of the present invention. The thermal embossing may be carried out in a single step using an embossing roll having protrusions of at least two different shapes formed on its surface, or in multiple steps using multiple embossing rolls. The temperature for the thermal embossing process may be adjusted appropriately depending on the fibers that make up the nonwoven fabric. For example, when using a nonwoven fabric made of polyester fibers, the temperature is preferably 180 to 250°C, and more preferably 200 to 240°C.

[0025] (Adhesive layer) The adhesive layer of the present invention is preferably composed of an adhesive. The adhesive is not particularly limited as long as it has the effect of the present invention, and any adhesive conventionally used in binding tapes can be used as appropriate. Specifically, examples of the adhesive that can be used include acrylic adhesives, rubber adhesives, silicone adhesives, and urethane adhesives.

[0026] As the acrylic adhesive, for example, one containing an acrylic polymer as a main component can be used. Examples of the acrylic polymer include polymers of alkyl (meth)acrylates and carboxyl group-containing unsaturated monomers. Examples of (meth)acrylic acid alkyl esters 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, etc. These may be used alone or in combination of two or more.

[0027] The carboxyl group-containing unsaturated monomer is not particularly limited as long as it is copolymerizable with the above-mentioned (meth)acrylic acid alkyl ester and exhibits the effects of the present invention, and examples thereof include acrylic acid, methacrylic acid, itaconic acid, fumaric acid, maleic acid, etc. These may be used alone or in combination of two or more.

[0028] The acrylic polymer may also be a copolymer containing other monomers in addition to the alkyl (meth)acrylates and carboxyl 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, and vinyl propionate. These may be used alone or in combination of two or more.

[0029] In one embodiment of the present invention, when an acrylic adhesive is used as the adhesive constituting the adhesive layer, it is preferable that the acrylic polymer is crosslinked in order to prevent the phenomenon of low molecular weight components contained in the acrylic adhesive permeating through the nonwoven fabric of the base layer (strike-through). Examples of methods for crosslinking acrylic polymers include a method of irradiating with active energy rays (ultraviolet rays, electron beams, etc.) and a method of adding an arbitrary crosslinking agent. Examples of the optional crosslinking agent 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, etc. These may be used alone or in combination of two or more.

[0030] Examples of rubber-based pressure-sensitive adhesives include those prepared by appropriately blending at least one rubber component selected from natural rubber and synthetic rubber with at least one tackifier selected from the group consisting of rosin-based resins, terpene-based resins, petroleum-based resins, etc. Examples of synthetic rubbers include at least one selected from the group consisting of styrene-isoprene-styrene block copolymers (SIS), styrene-butadiene-styrene block copolymers (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, a combination of natural rubber and at least one synthetic rubber selected from SBR, CR, and IIR is preferred, with a combination of natural rubber and SBR being particularly preferred, from the viewpoint of easily achieving both high adhesive strength and prevention of adhesive transfer on the back surface.

[0031] Examples of silicone-based adhesives include silicone rubber appropriately blended with silicone resin, silicone oil, and the like.

[0032] Examples of urethane-based adhesives include those obtained by reacting a polyol such as a polyether-based polyol or a polyester-based polyol with a polyisocyanate such as tolylene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), hexamethylene diisocyanate (HDI), or xylylene diisocyanate (XDI).

[0033] The adhesive forming the adhesive layer may contain any additives to the above-mentioned adhesive. Examples of 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, etc. These may be used alone or in combination of two or more.

[0034] Examples of tackifiers include petroleum-based resins such as aliphatic copolymers, aromatic copolymers, aliphatic-aromatic copolymers, and alicyclic copolymers, coumarone-indene resins, terpene resins, terpene phenol resins, rosin-based resins such as polymerized rosin, (alkyl)phenol resins, xylene resins, and hydrogenated versions of these, etc. These may be used alone or in combination of two or more.

[0035] In one embodiment of the present invention, a rubber-based adhesive is preferably used as the adhesive for constituting the adhesive layer, from the viewpoints of high adhesive strength and prevention of adhesive transfer to the back surface. The adhesive layer thickness is 10 to 100 g / m 2 is preferable, and 20 to 80 g / m 2 More preferably, 20 to 60 g / m 2 When the amount of the adhesive layer is within the above range, it is easier to achieve both hand tearability and high abrasion resistance. 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 that the total thickness of the adhesive layer is adjusted to be within the above range.

[0036] In one embodiment, the binding tape of the present invention preferably has a total thickness of 200 to 700 μm, more preferably 250 to 500 μm, and even more preferably 300 to 450 μm. The binding tape of the present invention having the above-described configuration is likely to achieve both high abrasion resistance and ease of hand tearing, even when its total thickness is in the range of 200 to 700 μm. In one embodiment, the total lamination amount of the binding tape (the total lamination amount of the base layer and the adhesive layer) is 100 to 400 g / m from the viewpoint of achieving both hand tearability and high abrasion resistance. 2 is preferable, and 180 to 320 g / m 2 More preferably, 220 to 280 g / m 2 is particularly preferred.

[0037] [Manufacturing method of binding tape] In a method for producing the binding tape of the present invention, for example, a fused portion is formed on the surface of a nonwoven fabric by the aforementioned heat embossing process. A resin film is then formed by a sheet extrusion method. A resin is then laminated onto one side of the nonwoven fabric by a thermal lamination method to form a base layer comprising a nonwoven fabric and a resin layer. The binding tape can then be produced by a method in which the aforementioned adhesive is applied directly to the base layer to form an adhesive layer, or by a method in which the adhesive is applied to a separate sheet and then transferred to the base layer. When the base layer is composed of a nonwoven fabric and a resin layer, the adhesive for forming the adhesive layer is preferably applied to the resin layer to form the adhesive layer. Examples of methods for applying the adhesive to the base layer or another sheet include roll coating, spray coating, gravure coating, reverse coating, rod coating, bar coating, die coating, kiss coating, reverse kiss coating, and air knife coating.

[0038] [Application] As described above, the binding tape of the present invention has high abrasion resistance and good hand tearability. Therefore, it can be suitably used in fields where these properties are required, such as as a binding tape for automotive electric wires. However, the use of the binding tape of this embodiment is not limited to binding automotive electric wires, etc.

[0039] Another preferred embodiment of the binding tape of the present invention is a binding tape having a substrate layer composed of a spunbond nonwoven fabric and a resin layer laminated on one side of the nonwoven fabric, and an adhesive layer laminated on the resin layer, wherein fused portions 1 and 2 of different areas are provided on the other side of the nonwoven fabric, and the binding tape has a tear load in the width direction measured in accordance with JIS K7128-2 (ISO 9383-2:1983) of 3 N to 30 N. It is preferable that fused portions 1 and 2 are arranged so that their long sides or major axes are parallel to the width direction of the binding tape. The scrape abrasion resistance of the binding tape measured in accordance with ISO 6722 is preferably 100 or more, more preferably 1000 or more. [Example]

[0040] The present invention will be described in detail below with reference to examples, but the present invention is not limited to the following description.

[0041] [Example 1] (Creating the base layer) Fiber diameter 10μm, basis weight 70g / m 2 , apparent density 0.28g / m 3 The nonwoven fabric was made by the spunbonding method using polyethylene terephthalate fibers, and fused parts 1 and 2 were formed by embossing. The shape of fused part 1 was rectangular, and its area was 0.3 mm. 2 The fused portion 2 had a rectangular shape and an area of ​​0.8 mm 2These fused parts 1 and 2 were formed so that the long sides of the rectangles were parallel to the TD direction. Furthermore, fused parts 1 and 2 were each formed as independent linear fused parts. TD1 was 0.8 mm, and TD2 was 2.7 mm. Next, a 110 μm thick PVC film extruded using a sheet extruder (T-die width 500 mm, φ40 mm extruder (manufactured by Tanabe Plastic Machinery Co., Ltd.)) was laminated by a thermal lamination method on the side of the nonwoven fabric where no fused portions were provided, to form a resin layer. The lamination amount of the resin layer was 140 g / m 2 The PVC used for the resin layer had the following composition: (PVC resin composition) 100 parts by mass of PVC (homopolymer of vinyl chloride, average degree of polymerization 1300, product name: "TH-1300", manufactured by Taiyo PVC Co., Ltd.) was blended with 58 parts by mass of DINP (manufactured by J-Plus Corporation), 2 parts by mass of epoxidized soybean oil (product name: "Chemisizer SNE-50", manufactured by Sanwa Synthetic Chemical Industry Co., Ltd.), 2 parts by mass of Ca-Zn-Mg composite stabilizer (product name: "OW-5200", manufactured by Sakai Chemical Industry Co., Ltd.), and 28 parts by mass of calcium carbonate (product name: "Calcise (registered trademark) P", manufactured by Konoshima Chemical Co., Ltd.).

[0042] (Making binding tape) A rubber-based adhesive emulsion was prepared by mixing 10 parts by mass (solids) of natural rubber latex (product name: "HA LATEX", manufactured by Resitex Co., Ltd.), 40 parts by mass (solids) of styrene-butadiene rubber latex (product name: "T-093A", manufactured by JSR Corporation), and 50 parts by mass (solids) of a petroleum resin-based emulsion tackifier (product name: "AP-1100-NT", manufactured by Arakawa Chemical Industries, Ltd.). Next, an adhesive layer was formed on the resin layer of the substrate layer (i.e., the side on which the nonwoven fabric was not laminated) using a comma coater method to obtain a binding tape. The layering amount of the adhesive layer was 50 g / m. 2 The total lamination amount of the obtained binding tape was 260 g / m 2 The total thickness was 360 μm. The abrasion resistance and hand tearability of the binding tape were evaluated according to the following procedures. The results are shown in Table 1.

[0043] <Abrasion resistance evaluation> A single layer of bundling tape, 19 mm wide and 50 mm long, was attached longitudinally to a 10 mm diameter steel rod. A 0.45 mm diameter piano wire was placed in contact with the nonwoven fabric side of the bundling tape, and a load of 7 N was applied, moving it back and forth longitudinally at a speed of 60 times per minute over a distance of 15.5 mm. The piano wire scraped the bundling tape, and the number of times it reciprocated until the bundling tape was penetrated was recorded as the scrape abrasion resistance. Abrasion resistance was evaluated according to the following criteria, with a grade of B or higher being considered pass (high abrasion resistance). Note that bundling tapes that received an A rating (scrape abrasion resistance of 1,000 or more times) according to the following criteria have abrasion resistance of Class D in the European Automotive Standard LV312. (Evaluation criteria) A: Resistance to scrape abrasion is 1,000 times or more. B: The scrape abrasion resistance is 100 times or more but less than 1000 times. C: The scrape abrasion resistance is less than 100 times.

[0044] <Evaluation of hand tearability> The tear load in the TD direction of the binding tape was evaluated in accordance with JIS K7128-2 (ISO 9383-2:1983). Specifically, a 9 mm slit was made in the center of a 19 mm wide, 75 mm long binding tape. The sample was then clamped and secured in the specimen chuck of an Elmendorf tester so that the width was parallel to the ground. Under conditions of 23°C and 50% RH, a 2.4 kg fan-shaped pendulum was dropped from a 70° angle starting from the ground, under its own weight, to tear the test piece. The value on the scale at this time was read, and the load required for tearing was calculated. Furthermore, hand-tearability was evaluated according to the following evaluation criteria, with a grade of B or higher being considered acceptable (good hand-tearability). A grade of C was deemed unsuitable (requiring a jig for cutting the tape). (Evaluation criteria) A: The tear load in the TD direction is less than 15N. B: The tear load in the TD direction is 15N or more and 30N or less. C: The tear load in the TD direction is more than 30N.

[0045] [Examples 2 to 12, Comparative Example 1] The binding tapes were produced in the same manner as in Example 1, except that the configurations of the nonwoven fabric, resin layer, and fused portion were as shown in Tables 1 and 2. The binding tapes of each example were evaluated for abrasion resistance and hand tearability in the same manner as in Example 1. In Tables 1 and 2, "NR / SBR" means natural rubber and synthetic rubber (styrene-butadiene rubber). The adhesive (NR / SBR) used in Examples 2 to 12 and Comparative Example 1 was the same as that used in Example 1. In Tables 1 and 2, "PET" means polyethylene terephthalate fiber, and "PP" means polypropylene fiber. The "PVC" in Examples 2 to 6 and 8 to 9 used the same PVC resin as in Example 1. Furthermore, the "EVA" in Example 7, the "LDPE" in Example 10, the "HDPE" in Example 11, and the "PP" in Example 12 used resins with the following compositions. (EVA resin) An EVA resin with an ethylene content of 94% (product name: "Novatec LV211A", manufactured by Japan Polyethylene Co., Ltd.) was used. (LDPE resin) Density is 0.94g / cm 3 An LDPE resin (product name: "Novatec LL UH943", manufactured by Japan Polyethylene Co., Ltd.) having a melting point of 127°C as measured by differential scanning calorimetry (DSC) was used. (HDPE resin) Density is 0.95g / cm 3 An HDPE resin (product name: "Novatec HD HF313", manufactured by Japan Polyethylene Co., Ltd.) having a melting point of 132°C as measured by differential scanning calorimetry (DSC) was used. (PP resin) A PP resin (product name: "PL400A", manufactured by SunAllomer Co., Ltd.) with a melting point of 168°C as measured by differential scanning calorimetry (DSC) was used.

[0046] [Table 1]

[0047] [Table 2]

[0048] As shown in Tables 1 and 2, the binding tapes of Examples 1 to 12, which satisfy the configuration of the present invention, have high abrasion resistance and good hand-tearability. Furthermore, it was found that the binding tapes of Examples 1 to 4, 6, and 9 to 12 also have excellent abrasion resistance equivalent to Class D of the European Automotive Standard LV312. On the other hand, the binding tape of Comparative Example 1, in which only one type of fused portion was formed in the nonwoven fabric and the tear load in the TD direction exceeded 30 N, had good abrasion resistance but was not hand-tearable, and a special jig was required to cut the tape. These results confirm that the binding tape of the present invention has high abrasion resistance and good hand-tearability. [Explanation of symbols]

[0049] 1: Fusion part 1 2: Fusion part 2 10: Nonwoven fabric 20: Resin layer 30:Adhesive layer 100: Binding tape

Claims

1. A binding tape having a base layer including a nonwoven fabric and a resin layer laminated on one side of the nonwoven fabric, and an adhesive layer, wherein the nonwoven fabric has fused portions having at least two different shapes, the tear load in the width direction of the binding tape measured in accordance with JIS K7128-2 is 30 N or less, and the total layer weight of the binding tape is 180 to 360 g / m ２ The binding tape has a total thickness of 200 to 700 μm.

2. 2. The binding tape of claim 1, which has a scrape abrasion resistance of 100 or more times as measured in accordance with ISO 6722.

3. The bundling tape according to claim 1 or 2, wherein the tear load in the width direction of the bundling tape is 3 N or more.

4. The binding tape according to claim 1 , wherein the nonwoven fabric is a spunbond nonwoven fabric.

5. A bundling tape as described in any one of claims 1 to 4, wherein the fused portion includes fused portion 1 and fused portion 2 having different areas, and at least one of the fused portion 1 and the fused portion 2 is arranged so that its long side (or long axis) is parallel to the TD direction of the bundling tape.

6. The binding tape according to claim 1 , which is used to bind electric wires.

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