Adhesive tape and wire harness

Abstract

The present invention addresses the problem of providing an adhesive tape having excellent lightness, wear resistance, expandability, and hand-cutting properties.　An embodiment of the present invention relates to an adhesive tape having a substrate layer and an adhesive layer formed on at least one surface of the substrate layer. The substrate layer is composed of a resin composition containing a polyvinyl chloride resin, a plasticizer, and a filler. The thickness of the substrate layer is 125-330 μm. A plurality of slits and / or notches are provided on at least one end in the width direction of the adhesive tape, and the depth S of the slits and / or notches with respect to the width W of the adhesive tape satisfies S / W = 0.010-0.25. Further, the breaking energy of the adhesive tape at 23°C when the slits and / or notches are not provided is 70 MJ / m3 or more.

Description

Adhesive tape, wire harnesses

[0001] The present invention relates to an adhesive tape. The present invention also relates to a wire harness having the adhesive tape.

[0002] Wire harnesses, which are bundles of multiple electric wires, are used in mechanical devices such as automobiles. Protective sheets, braided tubes, and the like have been used to protect wire harnesses, but in recent years, adhesive tapes that also function as bundling wire harnesses have been developed. Patent Document 1 discloses a polyvinyl chloride adhesive tape that is resistant to heat discoloration and hydrolysis. Patent Document 2 also discloses an adhesive tape that uses a non-phthalate plasticizer.

[0003] JP 2017-193620 A JP 2012-184369 A

[0004] However, in recent years, there has been a demand for improved fuel efficiency in automobiles and other vehicles, and with advances in precision, wire harnesses are increasingly being used in narrow spaces, which has led to a demand for lightweight pressure-sensitive adhesive tapes with high abrasion resistance.

[0005] On the other hand, adhesive tapes with high abrasion resistance are difficult to unfold and tear by hand, which reduces work efficiency.

[0006] The present invention has been made in view of the above circumstances, and provides an adhesive tape that is lightweight, has excellent abrasion resistance, spreadability, and hand tearability.

[0007] After extensive research, the inventors discovered that the above-mentioned problems can be solved by adjusting the composition of the resin composition that constitutes the adhesive tape to adjust the breaking energy of the adhesive tape, and by adopting a specific structure, and thus completed the present invention.

[0008] According to the present invention, the following is provided: [1] A pressure-sensitive adhesive tape having a base layer and a pressure-sensitive adhesive layer formed on at least one surface of the base layer, wherein the base layer is made of a resin composition containing a polyvinyl chloride resin, a plasticizer, and a filler, the base layer has a thickness of 125 to 330 μm, and a plurality of slits and / or notches are provided at at least one end in the width direction of the pressure-sensitive adhesive tape, the depth S of the slits and / or notches relative to the width W of the pressure-sensitive adhesive tape satisfies S / W = 0.010 to 0.25, and the breaking energy of the pressure-sensitive adhesive tape at 23°C when the slits and / or notches are not provided is 70 MJ / m ３or more. [2] The pressure-sensitive adhesive tape according to [1], wherein the tensile breaking elongation A of the pressure-sensitive adhesive tape at 23°C and the tensile breaking elongation B of the pressure-sensitive adhesive tape at 23°C when the slits and / or notches are not provided satisfy B / A = 2.0 to 9.0. [3] The pressure-sensitive adhesive tape according to [1] or [2], wherein the depth S of the slits and / or notches of the pressure-sensitive adhesive tape is 0.3 mm to 3 mm. [4] The pressure-sensitive adhesive tape according to any of [1] to [3], wherein the width W of the pressure-sensitive adhesive tape is 8 mm to 35 mm. [5] The pressure-sensitive adhesive tape according to any of [1] to [4], wherein the spacing between adjacent slits and / or notches provided at one end in the width direction of the pressure-sensitive adhesive tape among the plurality of slits and / or notches is 12 to 15 mm. [6] The pressure-sensitive adhesive tape according to any of [1] to [5], wherein the filler comprises at least one selected from the group consisting of calcium carbonate, mica, talc, and silica. [7] The pressure-sensitive adhesive tape according to any one of [1] to [6], wherein the resin composition further comprises an elastomer. [8] The pressure-sensitive adhesive tape according to [7], wherein the elastomer comprises a urethane elastomer. [9] The pressure-sensitive adhesive tape according to [7] or [8], wherein the elastomer comprises a polyester-based urethane elastomer.

[10] The pressure-sensitive adhesive tape according to any one of [7] to [9], wherein the content of the elastomer in the resin composition is 2.0% by mass to 15.0% by mass.

[11] The pressure-sensitive adhesive tape according to any one of [7] to

[10] , wherein the elastomer comprises an elastomer having a tensile elongation at break of 550% to 900%, measured according to a method in accordance with JIS K7311:1955.

[12] The pressure-sensitive adhesive tape according to any one of [1] to

[11] , wherein the pressure-sensitive adhesive tape without the slits and / or notches has a tensile modulus of elasticity of 150 N / mm to 450 N / mm, calculated as a thickness at 23°C.

[13] The pressure-sensitive adhesive tape according to any one of [1] to

[12] , which is for bundling a wire harness.

[14] A wire harness comprising electric wires and the pressure-sensitive adhesive tape according to any one of [1] to

[13] that bundles the electric wires.

[0009] According to the present invention, it is possible to provide an adhesive tape that is lightweight, has excellent abrasion resistance, spreadability, and hand tearability.

[0010] FIG. 1 is a plan view showing a pressure-sensitive adhesive tape according to a first embodiment. FIG. 2 is a cross-sectional view of the pressure-sensitive adhesive tape according to the first embodiment cut along line A-A in FIG. 1. FIG. 3 is a partially enlarged view showing one end in the width direction of a pressure-sensitive adhesive tape in an embodiment of the present invention. FIGS. 4A, 4B, 4C, 4D, and 4E are schematic process diagrams showing a method for producing a pressure-sensitive adhesive tape according to the first embodiment. FIG. 5 is a plan view showing a pressure-sensitive adhesive tape according to a second embodiment. FIG. 6 is a cross-sectional view of the pressure-sensitive adhesive tape according to a third embodiment cut along the longitudinal center line. FIG. 7 is a cross-sectional view of the pressure-sensitive adhesive tape according to a fourth embodiment cut along the longitudinal center line. FIG. 8 is a plan view showing a pressure-sensitive adhesive tape according to a fifth embodiment. FIG. 9 is a cross-sectional view of the pressure-sensitive adhesive tape according to the fifth embodiment cut along line B-B in FIG. 8.

[0011] The present invention will be described in detail below. However, the present invention is not limited to these descriptions. The features of the following embodiments can be combined with each other. Furthermore, each feature can be an invention independently.

[0012] <Explanation of Terms> In this specification, for example, the expression "X to Y" means that X or more and Y or less.

[0013] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In this specification and the drawings, components with the same reference numerals have substantially the same structure or function. In addition, the drawings may be drawn to different scales to facilitate understanding.

[0014] <First embodiment> 1. Adhesive tape Fig. 1 is a plan view showing an adhesive tape 10 according to this embodiment. Fig. 2 is a cross-sectional view of the adhesive tape 10 according to this embodiment cut along line A-A in Fig. 1. As shown in Fig. 2, the adhesive tape 10 according to this embodiment comprises a base layer 20, a primer layer 30, and a pressure-sensitive adhesive layer 40. The pressure-sensitive adhesive layer 40 is formed on one surface of the base layer 20 with the primer layer 30 interposed therebetween. In addition, the adhesive tape 10 according to this embodiment has a plurality of slits 12 formed at both ends in the width direction. Line C-C in Fig. 1 indicates the longitudinal center line of the adhesive tape 10.

[0015] The width (W) of the pressure-sensitive adhesive tape 10 according to the present embodiment can be appropriately set depending on the intended use, but is preferably 8 to 35 mm. The width (W) of the pressure-sensitive adhesive tape 10 may be, for example, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, or 35 mm, or may be within a range between any two of the values ​​exemplified here. When the width (W) of the pressure-sensitive adhesive tape 10 according to the present embodiment has such a value, the pressure-sensitive adhesive tape 10 can be suitably used to bind wire harnesses in a narrow space.

[0016] The total thickness of the pressure-sensitive adhesive tape 10 according to the present embodiment is preferably 150 to 350 μm, more preferably 180 to 300 μm. The total thickness of the pressure-sensitive adhesive tape 10 may be, for example, 150, 160, 170, 180, 190, 200, 210, 220, 230, 240, 250, 260, 270, 280, 290, 300, 310, 320, 330, 340, or 350 μm, or may be within a range between any two of the values ​​exemplified here. When the total thickness of the pressure-sensitive adhesive tape 10 according to the present embodiment is within this range, the pressure-sensitive adhesive tape 10 is lightweight and can be suitably used for wire harnesses in automobiles, etc.

[0017] 1.1 Slits The slits 12 according to this embodiment are provided at both widthwise ends of the pressure-sensitive adhesive tape 10, as shown in Fig. 1. In another embodiment, the slits 12 may be provided at one widthwise end of the pressure-sensitive adhesive tape 10. From the viewpoint of ease of operation when cutting by hand, it is preferable that the slits 12 are provided at both widthwise ends of the pressure-sensitive adhesive tape 10. Furthermore, the slits 12 according to this embodiment are provided over the entire height of the base layer 20, the primer layer 30, and the pressure-sensitive adhesive layer 40, as shown in Fig. 2.

[0018] As will be described later, the slits 12 may be replaced with notches 14 (hereinafter, the description regarding the slits 12 also applies to the notches 14). From the viewpoint of ease of manufacturing, it is preferable that a plurality of slits 12 are provided in the width direction of the adhesive tape 10.

[0019] When the slits 12 are provided at both ends in the width direction of the adhesive tape 10, the slits 12 at both ends may be provided at the same position in the length direction, or at different positions in the length direction. As shown in Fig. 1, the slits 12 at both ends are preferably provided alternately at different positions in the length direction of the adhesive tape 10. When the slits 12 are provided in this manner, the adhesive tape 10 can be cut at a position close to the desired length.

[0020] As shown in Fig. 1, the shape of the slit 12 according to this embodiment is a straight line perpendicular to the widthwise end of the pressure-sensitive adhesive tape 10, but the shape of the slit 12 is not particularly limited. Fig. 3 is a partially enlarged view showing one widthwise end of the pressure-sensitive adhesive tape 10 in an embodiment (this embodiment is a view showing one mode of the pressure-sensitive adhesive tape 10 in order to explain the slit 12, and is different from the pressure-sensitive adhesive tape 10 according to the first embodiment). As shown in Fig. 3, the shape of the slit 12 may be a straight line (slit 12b) that is not perpendicular to the widthwise end of the pressure-sensitive adhesive tape 10, or may be a curved line (slit 12c) or other non-linear shape.

[0021] The depth (S) of the slit 12 according to this embodiment is preferably 0.3 to 3 mm, and more preferably 0.5 to 1 mm. Here, the "slit depth" in this specification refers to the shortest distance (orthogonal distance) from the deepest part of the slit to the end of the adhesive tape in the width direction where the slit is provided. In FIG. 1, the depth of the slit 12 is S. Also, in FIG. 3, the adhesive tape 10 is provided with slits 12a, 12b, and 12c of different shapes. In FIG. 3, the depths of the slits 12a, 12b, and 12c are Sa, Sb, and Sc, respectively. The depth (S) of the slit 12 may be, for example, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2.0, 2.1, 2.2, 2.3, 2.4, 2.5, 3.0, 3.1, 3.2, 3.3, or 3.4 mm, or may be within a range between any two of the values ​​exemplified here. When the depth (S) of the slit 12 according to the present embodiment is within this range, the pressure-sensitive adhesive tape 10 has excellent hand-tearability and spreadability.

[0022] The depth (S) of the slit 12 relative to the width (W) of the pressure-sensitive adhesive tape 10 according to the present embodiment preferably satisfies S / W = 0.010 to 0.25. The depth (S) of the slit 12 relative to the width (W) of the pressure-sensitive adhesive tape 10 may be, for example, S / W = 0.010, 0.020, 0.030, 0.040, 0.050, 0.060, 0.070, 0.080, 0.090, 0.10, 0.11, 0.12, 0.13, 0.14, 0.15, 0.16, 0.17, 0.18, 0.19, 0.20, 0.21, 0.22, 0.23, 0.24, or 0.25, or may be within a range between any two of the numerical values ​​exemplified here. When the depth (S) of the slit 12 relative to the width (W) of the adhesive tape 10 according to this embodiment is within this range, the strength of the adhesive tape 10 is maintained while the adhesive tape 10 is excellent in hand tearability and unfoldability.

[0023] Of the multiple slits 12 according to this embodiment, the distance (D) between adjacent slits 12 provided at one end of the width direction of the pressure-sensitive adhesive tape 10 is preferably 5 to 20 mm, more preferably 10 to 15 mm, and even more preferably 12 to 15 mm. Here, the "distance between adjacent slits" in this specification refers to the length between the intersections of lines drawn perpendicular to the center line of the pressure-sensitive adhesive tape in the longitudinal direction (line C-C in Figures 1 or 3) from the deepest part of each slit. In Figure 1, an example of the distance between adjacent slits is D. Also, in Figure 3, the distance between slits 12a and 12b is Da. The distance between slits 12b and 12c is Db. The distance (D) between adjacent slits 12 provided at one end in the width direction of the adhesive tape 10 may be, for example, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, or 20 mm, or may be within a range between any two of the numerical values ​​exemplified here. Note that, in one adhesive tape 10, the distances (D) between adjacent slits 12 provided at one end in the width direction may be different within the above-mentioned range. When the distance (D) between adjacent slits 12 provided at one end in the width direction of the adhesive tape 10 according to the present embodiment is within such a range, the strength of the adhesive tape 10 can be maintained and the adhesive tape 10 can be cut at a position close to the desired length.

[0024] 1.2 Substrate Layer The thickness of the substrate layer 20 according to this embodiment is preferably 125 μm or more, more preferably 145 μm or more. Furthermore, the thickness of the substrate layer 20 according to this embodiment is preferably 330 μm or less. The thickness of the substrate layer 20 according to this embodiment is preferably 125 to 330 μm, more preferably 145 to 330 μm. The thickness of the substrate layer 20 may be, for example, 125, 130, 140, 150, 160, 170, 180, 190, 200, 210, 220, 230, 240, 250, 260, 270, 280, 290, 300, 310, 320, or 330 μm, or may be within a range between any two of the values ​​exemplified here. The substrate layer 20 according to this embodiment has excellent abrasion resistance and therefore has sufficient strength even at such a thickness.

[0025] The base layer 20 according to this embodiment is preferably made of a resin composition. The resin composition according to this embodiment contains a polyvinyl chloride resin, a plasticizer, and a filler.

[0026] 1.2.1 Polyvinyl Chloride Resin The polyvinyl chloride resin according to this embodiment preferably has an average degree of polymerization of 500 to 2000, and more preferably an average degree of polymerization of 1000 to 2000. The average degree of polymerization of the polyvinyl chloride resin may be, for example, 500, 600, 700, 800, 900, 1000, 1100, 1200, 1300, 1400, 1500, 1600, 1700, 1800, 1900, or 2000, or may be within a range between any two of the values ​​exemplified here. Two or more polyvinyl chloride resins with different average degrees of polymerization may also be used. When the lower limit of the average degree of polymerization of the polyvinyl chloride resin is within this range, the polymer chains become entangled, resulting in excellent abrasion resistance. When the upper limit of the average degree of polymerization of the polyvinyl chloride resin is within this range, gelation is facilitated and film-forming properties are excellent.

[0027] 1.2.2 Plasticizer The plasticizer according to the present embodiment is not particularly limited as long as it can impart flexibility to the base layer 20. Examples of the plasticizer according to the present embodiment include carboxylic acid ester-based plasticizers, polyester-based plasticizers, epoxy-based plasticizers, and phosphoric acid-based plasticizers. These plasticizers may be used alone or in combination of two or more. Preferred plasticizers according to the present embodiment are carboxylic acid ester-based plasticizers and polyester-based plasticizers. Furthermore, from the viewpoint of cost, preferred plasticizers according to the present embodiment are carboxylic acid ester-based plasticizers.

[0028] Examples of carboxylic acid ester-based plasticizers include phthalate esters, isophthalate esters, trimellitate esters, adipate esters, and terephthalate esters. Phthalate esters and trimellitate esters are preferred as plasticizers according to this embodiment. These types of plasticizers tend to reduce the melt viscosity of the resin composition, making it easier to achieve a uniform thickness during film formation and reducing the likelihood of pinholes occurring in the base material layer 20. Furthermore, from the viewpoint of cost, phthalate esters are preferred as plasticizers according to this embodiment.

[0029] Examples of phthalate esters include diisononyl phthalate (DINP), diheptyl phthalate (DHP), di-2-ethylhexyl phthalate (DOP), di-n-octyl phthalate (n-DOP), and diisodecyl phthalate (DIDP). As the plasticizer according to this embodiment, a diester of phthalic acid with an alcohol having 9 to 10 carbon atoms, such as diisononyl phthalate (DINP) or diisodecyl phthalate (DIDP), is preferred. Such types of plasticizers have an excellent plasticizing effect on polyvinyl chloride and little bleed-out.

[0030] An example of a trimellitic acid ester is trioctylate trimellitate (TOTM). When such a type of plasticizer is used, the resin composition has excellent heat resistance.

[0031] Examples of adipic acid esters include diisononyl adipate (DINA) and dioctyl adipate (DOA). When such types of plasticizers are used, the resin composition has excellent flexibility and film-forming properties.

[0032] Examples of polyester plasticizers include polyesters of dibasic acids and glycols. Examples of dibasic acids include phthalic acid, adipic acid, and sebacic acid. Examples of glycols include 1,2-propanediol and butanediol. With these types of plasticizers, the molecular weight of the plasticizer is relatively large, so the volatility of the resin composition is low, and the polarity of the plasticizer is relatively high, so the resin composition has excellent oil resistance.

[0033] In the resin composition according to this embodiment, when the resin composition is taken as 100% by mass, the plasticizer content is preferably less than 20.0% by mass. Furthermore, in the resin composition according to this embodiment, when the resin composition is taken as 100% by mass, the plasticizer content is preferably 14.0% by mass or more. The plasticizer content in the resin composition may be, for example, 14.0, 14.5, 15.0, 15.5, 16.0, 16.5, 17.0, 17.5, 18.0, 18.5, 19.0, 19.5, or 19.9% ​​by mass, or may be within a range between any two of the values ​​exemplified here. When the plasticizer content is within this range, the breaking energy and tensile breaking elongation of the adhesive tape 10 are improved.

[0034] In the resin composition according to the present embodiment, the amount of plasticizer is preferably 30 parts by mass or more and preferably 45 parts by mass or less per 100 parts by mass of polyvinyl chloride resin. Per 100 parts by mass of polyvinyl chloride resin in the resin composition, the amount of plasticizer may be, for example, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, or 45 parts by mass, or may be within a range between any two of the values ​​exemplified here. When the plasticizer content is within this range, the breaking energy and tensile breaking elongation of the pressure-sensitive adhesive tape 10 are improved.

[0035] 1.2.3 Filler The filler according to the present embodiment is not particularly limited as long as it can increase the amount of the base layer 20 and improve its hardness. As the filler according to the present embodiment, an inorganic filler is preferred. This type of filler can provide both the reinforcing effect and flexibility of the base layer 20.

[0036] Examples of inorganic fillers according to this embodiment include calcium carbonate, aluminum hydroxide, magnesium hydroxide, zirconium hydroxide, calcium hydroxide, potassium hydroxide, barium hydroxide, triphenyl phosphite, ammonium polyphosphate, polyphosphate amide, zirconium oxide, magnesium oxide, zinc oxide, titanium oxide, molybdenum oxide, guanidine phosphate, hydrotalcite, smectite, zinc borate, anhydrous zinc borate, zinc metaborate, barium metaborate, antimony oxide, antimony pentoxide, red phosphorus, mica, talc, alumina, silica, boehmite, bentonite, sodium silicate, calcium silicate, calcium sulfate, and magnesium carbonate. These fillers may be used alone or in combination of two or more. Preferred fillers according to this embodiment include calcium carbonate, mica, talc, and silica, with calcium carbonate being particularly preferred. That is, the filler according to this embodiment preferably contains at least one selected from the group consisting of calcium carbonate, mica, talc, and silica, and more preferably contains calcium carbonate. When the filler is of such a type, it can be easily mixed with the polyvinyl chloride resin, and the adhesive tape 10 has excellent abrasion resistance.

[0037] The particle size of the filler according to this embodiment is preferably 0.01 to 20 μm, and more preferably 0.05 to 10 μm. Here, in this specification, "particle size" refers to the average particle size. The average particle size can be the arithmetic mean particle size determined by observation with an electron microscope (e.g., a transmission electron microscope). The particle size of the filler may be, for example, 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.10, 0.11, 0.012, 0.13, 0.14, 0.15, 0.16, 0.17, 0.18, 0.19, 0.20, 0.25, 0.50, 1.0, 5.0, 10, or 20 μm, or may be within a range between any two of the values ​​exemplified here. When the particle size of the filler is within this range, it becomes easy to knead it with the polyvinyl chloride resin.

[0038] In the resin composition according to this embodiment, when the resin composition is taken as 100% by mass, the filler content is preferably 10.0% by mass or more and preferably 32.0% by mass or less. When the polyvinyl chloride resin in the resin composition is taken as 100% by mass, the filler content may be, for example, 10.0, 11.0, 12.0, 13.0, 14.0, 15.0, 16.0, 17.0, 18.0, 19.0, 20.0, 21.0, 22.0, 23.0, 24.0, 25.0, 26.0, 27.0, 28.0, 29.0, 30.0, 31.0, or 32.0% by mass, or may be within a range between any two of the values ​​exemplified here. When the lower limit of the filler content is such a value, the pressure-sensitive adhesive tape 10 has excellent abrasion resistance. When the upper limit of the filler content is within this range, the adhesive tape 10 has excellent abrasion resistance and flexibility, and the tensile elongation at break is improved.

[0039] In the resin composition according to this embodiment, the filler content is preferably 10 parts by mass or more, more preferably 15 parts by mass or more, per 100 parts by mass of polyvinyl chloride resin. In the resin composition according to this embodiment, the filler content is preferably 80 parts by mass or less, more preferably 70 parts by mass or less, per 100 parts by mass of polyvinyl chloride resin. In the resin composition, the filler content per 100 parts by mass of polyvinyl chloride resin may be, for example, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, or 80 parts by mass, or may be within a range between any two of the values ​​exemplified here. When the filler content is within this range, the pressure-sensitive adhesive tape 10 has excellent flexibility and improved tensile elongation at break.

[0040] 1.2.4 Elastomer The resin composition according to the present embodiment preferably further contains an elastomer. When an elastomer is contained, the pressure-sensitive adhesive tape has excellent abrasion resistance. The elastomer according to the present embodiment is preferably a thermoplastic elastomer. Examples of thermoplastic elastomers include urethane elastomers, olefin elastomers, polyvinyl chloride elastomers, chlorinated polyethylene elastomers, ethylene vinyl acetate elastomers, polyester elastomers, styrene elastomers, and polyamide elastomers. These elastomers may be used alone or in combination of two or more. The elastomer according to the present embodiment preferably contains a urethane elastomer. When the elastomer is of such a type, the breaking energy and tensile breaking elongation of the pressure-sensitive adhesive tape 10 are improved.

[0041] Examples of urethane elastomers include polyester-based polyurethane elastomers, polyether-based urethane elastomers, and polycarbonate-based urethane elastomers. The elastomer according to the present embodiment preferably includes a polyester-based urethane elastomer. When the elastomer is of this type, the breaking energy and tensile breaking elongation of the pressure-sensitive adhesive tape 10 are improved.

[0042] In the resin composition according to this embodiment, the elastomer content is preferably 2.0% by mass or more and 15.0% by mass or less, based on 100% by mass of the resin composition. The elastomer content may be, for example, 2.0, 2.5, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0, 10.0, 11.0, 12.0, 13.0, 14.0, or 15.0% by mass, or may be within a range between any two of the values ​​exemplified here. When the lower limit of the elastomer content is within this range, the pressure-sensitive adhesive tape 10 has improved breaking energy and tensile elongation at break, resulting in excellent abrasion resistance. When the upper limit of the elastomer content is within this range, the pressure-sensitive adhesive tape 10 has excellent weather resistance, hydrolysis resistance, abrasion resistance, and bleed-out resistance.

[0043] In the resin composition according to this embodiment, the elastomer is preferably present in an amount of 3 parts by mass or more, more preferably 5 parts by mass or more, per 100 parts by mass of polyvinyl chloride resin. In the resin composition according to this embodiment, the elastomer is preferably present in an amount of 25 parts by mass or less, more preferably 20 parts by mass or less, per 100 parts by mass of polyvinyl chloride resin. The amount of elastomer present in the resin composition per 100 parts by mass of polyvinyl chloride resin may be, for example, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, or 25 parts by mass, or may be within a range between any two of the values ​​exemplified here. When the lower limit of the elastomer content is within this range, the pressure-sensitive adhesive tape 10 has excellent flexibility and abrasion resistance. When the upper limit of the elastomer content is within this range, the pressure-sensitive adhesive tape 10 has excellent weather resistance, hydrolysis resistance, abrasion resistance, and bleed-out resistance.

[0044] The elastomer according to this embodiment preferably has a tensile elongation at break of 550% or more and 900% or less. The tensile elongation at break of the elastomer may be, for example, 550, 560, 580, 600, 700, 720, 740, 760, 780, 800, 820, 840, 860, 880, or 900%, or may be within a range between any two of the values ​​exemplified here. The tensile elongation at break of the elastomer can be measured by a method conforming to JIS K7311:1955. When the tensile elongation at break of the elastomer is within this range, the pressure-sensitive adhesive tape 10 has excellent abrasion resistance.

[0045] The elastomer according to this embodiment preferably has a wear amount of 10 mg or more and preferably 40 mg or less. The wear amount of the elastomer may be, for example, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, 36, 38, or 40 mg, or may be within a range between any two of the values ​​exemplified here. The wear amount of the elastomer can be measured by a method conforming to JIS K7204:1999. When the wear amount of the elastomer is within this range, the pressure-sensitive adhesive tape 10 has excellent wear resistance.

[0046] 1.2.5 Others The resin composition according to this embodiment may contain other additives as needed, provided that the effects of the present invention are not impaired. Examples of other additives include colorants (including pigments such as carbon black), stabilizers, antioxidants, UV absorbers, and lubricants.

[0047] 1.3 Pressure-sensitive adhesive layer The thickness of the pressure-sensitive adhesive layer 40 according to this embodiment can be appropriately set depending on the intended use and application. The thickness of the pressure-sensitive adhesive layer 40 is, for example, 5 to 50 μm, and more preferably 10 to 30 μm.

[0048] The adhesive of the adhesive layer 40 according to this embodiment is preferably a rubber-based adhesive, and may be either a solvent-based or emulsion-based adhesive. The rubber-based adhesive preferably contains one or more rubbers selected from natural rubber or synthetic rubber and a tackifier resin, and more preferably a mixture of natural rubber, synthetic rubber, and tackifier resin. The content of the tackifier resin is preferably 50 to 150 parts by mass per 100 parts by mass of the rubber component (combined natural rubber and synthetic rubber).

[0049] Examples of natural rubber and synthetic rubber include natural rubber-methyl methacrylate copolymer latex, styrene-butadiene copolymer, acrylonitrile-butadiene copolymer, and methyl methacrylate-butadiene copolymer. These may be used alone or in combination of two or more.

[0050] The tackifying resin can be selected in consideration of the softening point and compatibility with each component. Examples of tackifying resins include terpene resins, rosin resins, hydrogenated rosin resins, coumarone-indene resins, styrene-based resins, aliphatic petroleum resins, alicyclic petroleum resins, aliphatic / alicyclic copolymer petroleum resins, terpene-phenol resins, xylene-based resins, and emulsions of other aliphatic hydrocarbon resins and aromatic hydrocarbon resins. These may be used alone or in combination of two or more.

[0051] The rubber-based adhesive can be selected from solvent-based and emulsion-based adhesives, but emulsion-based adhesives are preferred because they generate less volatile organic compounds (VOCs).

[0052] 1.4 Primer Layer The pressure-sensitive adhesive tape 10 according to this embodiment has a primer layer 30 provided between the base layer 20 and the pressure-sensitive adhesive layer 40. The provision of the primer layer 30 can improve the adhesion between the base layer 20 and the pressure-sensitive adhesive layer 40.

[0053] The thickness of the primer layer 30 according to this embodiment is not particularly limited as long as it can improve the adhesion between the substrate layer 20 and the pressure-sensitive adhesive layer 40. The thickness of the primer layer 30 is, for example, 0.1 to 1.0 μm, and more preferably 0.3 to 0.5 μm.

[0054] The primer for the primer layer 30 according to this embodiment is preferably a mixture of a graft polymer obtained by graft polymerizing methyl methacrylate onto natural rubber and an acrylonitrile-butadiene copolymer.

[0055] The graft polymer according to this embodiment is preferably one obtained by graft polymerizing 70 to 40% by mass of natural rubber with 30 to 60% by mass of methyl methacrylate. When the lower limit of the methyl methacrylate content is within this range, adhesion to the base layer 20 is excellent and delamination is unlikely to occur. When the upper limit of the methyl methacrylate content is within this range, the primer itself is less likely to harden and is more likely to follow deformation of the base layer 20, making delamination less likely to occur.

[0056] As the acrylonitrile-butadiene copolymer according to this embodiment, a medium nitrile type (25 to 30% by mass of acrylonitrile, 75 to 70% by mass of butadiene), a medium-high nitrile type (31 to 35% by mass of acrylonitrile, 69 to 65% by mass of butadiene), or a high nitrile type (36 to 43% by mass of acrylonitrile, 64 to 57% by mass of butadiene) can be used. These may be used alone or in combination of two or more. The content of the acrylonitrile-butadiene copolymer is preferably 25 to 300 parts by mass relative to 100 parts by mass of the graft polymer.

[0057] 1.5 Other Layers The pressure-sensitive adhesive tape 10 according to this embodiment may further include other layers, provided that the effects of the present invention are not impaired. As an example, a release layer may be further provided on the surface of the pressure-sensitive adhesive layer 40 opposite to the surface on which the base layer 20 is formed.

[0058] 2. Manufacturing Method of Adhesive Tape The adhesive tape 10 according to this embodiment can be manufactured, for example, by laminating the primer layer 30 and the adhesive layer 40 in this order on one surface of the base layer 20 to form a laminate 11, and then forming a plurality of slits 12 in the laminate 11. Figures 4A to 4E are schematic process diagrams showing the manufacturing method of the adhesive tape 10 according to this embodiment.

[0059] 2.1 Manufacturing Method of Base Layer The resin composition according to this embodiment can be manufactured by melt-kneading polyvinyl chloride resin, plasticizer, filler, and elastomer in a mixer or the like so as to uniformly disperse them. The base layer 20 according to this embodiment can be manufactured by forming the resin composition into a predetermined thickness using a calendar molding machine or the like ( FIG. 4A ). The temperature at this time can be set arbitrarily depending on the components in the resin composition, and can be set, for example, to 100 to 200°C.

[0060] 2.2 Manufacturing Method of Primer Layer and Adhesive Layer In one embodiment of the manufacturing method of the primer layer 30 and adhesive layer 40 according to this embodiment, a primer is first applied to one side of the substrate layer 20, and the solvent (e.g., moisture) is thoroughly removed in a drying oven (FIG. 4B). Next, an adhesive is applied onto the primer layer 30, and the solvent (e.g., moisture) is thoroughly removed in a drying oven, thereby obtaining a laminate 11 (FIG. 4C). Examples of primer application methods include gravure, spray, kiss roll, bar, and knife. Examples of adhesive application methods include comma, lip die, gravure, roll, and slot die. The laminate 11 may further be cut into strips of the desired width (W) (FIG. 4D).

[0061] 2.3 Method for Making Slits The slits 12 according to this embodiment can be made by cutting the laminate 11 from the end in the width direction toward the center. At this time, by making the laminate 11 in a roll shape, multiple slits 12 can be made in a single cutting operation. The cutting method is not particularly limited as long as it can cut the laminate 11, and a rotary blade, a round blade, or the like can be used. By making multiple slits 12 in the laminate 11, the pressure-sensitive adhesive tape 10 can be made ( FIG. 4E ).

[0062] 3. Characteristics of the Pressure-Sensitive Adhesive Tape 3.1 Breaking Energy The breaking energy at 23°C of the pressure-sensitive adhesive tape (for example, the laminate 11 in FIG. 4D described above) without the slit 12 according to this embodiment is preferably large. The breaking energy of the pressure-sensitive adhesive tape at 23°C can be measured by a method in accordance with JIS K7127:1999. The breaking energy of the pressure-sensitive adhesive tape at 23°C can be measured, for example, by the following procedures: (1) clamping and fixing a 19 mm wide and 200 mm long pressure-sensitive adhesive tape test piece in the chucks of a tensile tester so that the chuck distance is 100 mm, (2) conducting a tensile test in which the pressure-sensitive adhesive tape test piece is pulled at a rate of 300 mm / min in an environment of room temperature of 23°C and relative humidity of 50%, thereby measuring the stress and strain, and (3) creating a stress-strain curve with stress on the vertical axis and strain on the horizontal axis, and calculating the area under the curve up to the breaking point. The breaking energy of the adhesive tape without the slit 12 according to this embodiment at 23°C is 70 MJ / m ３ The upper limit of the breaking energy at 23°C of the pressure-sensitive adhesive tape 10 in the present embodiment without the slits 12 is, but is not particularly limited to, 200 MJ / m ３ The breaking energy of the pressure-sensitive adhesive tape at 23°C when the slit 12 is not provided can be, for example, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 95, 100, 105, 110, 115, 120, 125, 130, 140, 150, 160, 170, 180, 190, or 200 MJ / m ３ or may be within a range between any two of the numerical values ​​exemplified herein. When the breaking energy of the adhesive tape is within this range, the adhesive tape has excellent abrasion resistance and flexibility. Furthermore, since the adhesive tape 10 according to the present embodiment is provided with a plurality of slits 12, the adhesive tape has excellent hand tearability even when it has such a breaking energy. The breaking energy of the adhesive tape can be controlled by adjusting the type and amount of the compounding in the resin composition constituting the base layer 20, in particular the type and amount of elastomer, the amount of plasticizer, or the thickness of the base layer 20.

[0063] 3.2 Ratio of Tensile Breaking Elongation The tensile breaking elongation (A) at 23°C of the pressure-sensitive adhesive tape 10 according to the present embodiment and the tensile breaking elongation (B) at 23°C of the pressure-sensitive adhesive tape when no slits 12 are provided (for example, the laminate 11 in FIG. 4D described above) preferably satisfy the ratio B / A = 2.0 to 9.0. The tensile breaking elongation of the pressure-sensitive adhesive tape at 23°C can be the strain at break when a tensile test is performed using the same procedure as in the above-described "3.1 Breaking Energy." The tensile breaking elongation (A) at 23°C of the pressure-sensitive adhesive tape 10 and the tensile breaking elongation (B) at 23°C of the pressure-sensitive adhesive tape when no slits 12 are provided may, for example, satisfy B / A = 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, or 9.0, or may be within a range between any two of the values ​​exemplified herein. The adhesive tape 10 of this embodiment tends to have a high tensile breaking elongation (B) at 23°C when no slits 12 are provided, but by providing slits 12, the tensile breaking elongation (A) is lowered, resulting in excellent hand tearability.

[0064] 3.3 Thickness-equivalent Tensile Modulus The thickness-equivalent tensile modulus of the pressure-sensitive adhesive tape (e.g., the laminate 11 in FIG. 4D described above) without the slit 12 according to this embodiment is preferably 150 to 450 N / mm at 23°C. The thickness-equivalent tensile modulus of the pressure-sensitive adhesive tape at 23°C can be measured by a method conforming to JIS K7127:1999. The thickness-equivalent tensile modulus of the pressure-sensitive adhesive tape at 23°C can be, for example, the product of the value calculated by linear regression of the stress-strain ratio between 0.01% and 0.05% strain when a tensile test is performed using the same procedure as in "3.1 Breaking Energy" described above, and the total thickness of the pressure-sensitive adhesive tape. The tensile modulus of elasticity of the pressure-sensitive adhesive tape at 23°C, calculated as thickness when no slit 12 is provided, may be, for example, 150, 160, 170, 180, 190, 200, 210, 220, 230, 240, 250, 260, 270, 280, 290, 300, 310, 320, 330, 340, 350, 360, 370, 380, 390, 400, 410, 420, 430, 440, or 450 N / mm, or may be within a range between any two of the values ​​exemplified here. When the lower limit of the tensile modulus of elasticity of the pressure-sensitive adhesive tape, calculated as thickness when no slit 12 is provided, is within this range, the pressure-sensitive adhesive tape 10 has excellent abrasion resistance. Furthermore, when the upper limit of the tensile modulus of elasticity of the pressure-sensitive adhesive tape, calculated as thickness when no slit 12 is provided, is within this range, the pressure-sensitive adhesive tape 10 has excellent flexibility.

[0065] 3.4 Abrasion Resistance The pressure-sensitive adhesive tape 10 according to this embodiment preferably has excellent abrasion resistance. The abrasion resistance of the pressure-sensitive adhesive tape can be measured by a method conforming to ISO 6722-1 (2001). The abrasion resistance of the pressure-sensitive adhesive tape can be measured, for example, by the following procedure: (1) wrapping a substrate layer sample around a cylinder with a diameter of 10 mm twice and securing it with tape or the like; (2) abrading the surface of the substrate layer sample with sandpaper or abrasive cloth containing a hard material (fused alumina) and a grain size of 150 μm at a load of 450 g and a speed of 1500 mm / min; and (3) measuring the abrasion distance (abrasion resistance value) until a hole is formed in the substrate layer sample. The abrasion resistance value of the pressure-sensitive adhesive tape is preferably 700 mm or more, and more preferably 1000 mm or more. The abrasion resistance value of the pressure-sensitive adhesive tape 10 may be, for example, 700, 800, 900, 1000, 1100, 1200, 1300, 1400, 1500, 2000, 2500, or 3000 mm, or may be within a range between any two of the values ​​exemplified here. When the abrasion resistance value of the pressure-sensitive adhesive tape 10 is in such a range, a pressure-sensitive adhesive tape with excellent abrasion resistance can be provided.

[0066] 3.5 Flexibility The pressure-sensitive adhesive tape 10 according to the present embodiment preferably has excellent flexibility. The flexibility of the pressure-sensitive adhesive tape can be evaluated, for example, by the following procedure: (1) spirally wrapping the pressure-sensitive adhesive tape around a bundle of electric wires having a diameter of 10 mm or 15 mm, with the adhesive side facing inward so that the pressure-sensitive adhesive layer 40 contacts the bundle of electric wires, two times to form a bundle of electric wires; (2) wrapping the bundle of electric wires once around a mandrel having a diameter of 50 mm; and (3) checking for the presence or absence of lifting (gaps due to peeling) between the pressure-sensitive adhesive tape and the bundle of electric wires. The pressure-sensitive adhesive tape 10 preferably does not lift when used with a bundle of electric wires having a diameter of 15 mm, and more preferably does not lift when used with a bundle of electric wires having a diameter of both 10 mm and 15 mm. When the pressure-sensitive adhesive tape 10 has such flexibility, it can maintain the binding of even thin bundles of electric wires.

[0067] 3.6 Bleed-out Resistance The pressure-sensitive adhesive tape 10 according to the present embodiment preferably has excellent bleed-out resistance. The bleed-out resistance of a pressure-sensitive adhesive tape can be evaluated, for example, by observing the appearance of the pressure-sensitive adhesive tape after storing the pressure-sensitive adhesive tape at a set temperature of 60°C for one month. It is preferable that the pressure-sensitive adhesive tape 10 exhibits changes in appearance such as slight swelling, bubbles, changes in gloss, or seepage of plasticizer, and it is more preferable that no changes in appearance are observed. When the pressure-sensitive adhesive tape 10 has such bleed-out resistance, it can be used continuously for a long period of time.

[0068] 3.7 Hand Tearability The pressure-sensitive adhesive tape 10 according to the present embodiment preferably has excellent hand tearability. The hand tearability of the pressure-sensitive adhesive tape can be evaluated, for example, by the following procedure: (1) winding the pressure-sensitive adhesive tape into a roll, (2) unfolding the pressure-sensitive adhesive tape from the outer end, and (3) checking the ease of tearing when manually pulling the pressure-sensitive adhesive tape in the lengthwise direction while fixing the outer end. The pressure-sensitive adhesive tape 10 preferably can be manually cut without any problems, and more preferably can be easily manually cut. When the pressure-sensitive adhesive tape 10 has such hand tearability, work efficiency is good.

[0069] 3.8 Spreadability The adhesive tape 10 according to the present embodiment preferably has excellent spreadability. The spreadability of the adhesive tape can be evaluated by the following procedure: (1) preparing a roll of adhesive tape, (2) unfolding the adhesive tape from the outer end, and (3) checking the state of the adhesive tape when unfolded. It is preferable that the adhesive tape 10 can be easily unfolded without being torn. When the adhesive tape 10 has such spreadability, work efficiency is good.

[0070] 3.9 Lightweight The pressure-sensitive adhesive tape 10 according to the present embodiment is preferably lightweight. The light weight of the pressure-sensitive adhesive tape can be evaluated, for example, by measuring the weight per unit area. The pressure-sensitive adhesive tape 10 has a weight of 550 g / m ２ Preferably, it is less than 400 g / m ２ When the pressure-sensitive adhesive tape 10 has such a light weight, it can be suitably used as a component for automobiles and the like.

[0071] 4. Method of Use The pressure-sensitive adhesive tape 10 according to this embodiment can be used to bundle wire harnesses. Accordingly, one embodiment of the present invention is a wire harness having electric wires and the pressure-sensitive adhesive tape 10 for bundling the electric wires. The pressure-sensitive adhesive tape 10 according to this embodiment can be used in various mechanical devices such as automobiles, aircraft, trains, factory automation equipment, home appliances, office automation equipment, medical equipment, communications equipment, and play equipment, or in components for such mechanical devices. Because the pressure-sensitive adhesive tape 10 according to this embodiment has excellent abrasion resistance, it can be particularly suitably used in operating mechanical devices such as automobiles, aircraft, trains, factory automation equipment, home appliances, and play equipment, or in components for such mechanical devices.

[0072] Next, modified examples of the pressure-sensitive adhesive tape 10 of the above-described embodiment will be described. However, the same components as those of the above-described embodiment will be assigned the same reference numerals, and their description will be omitted. First, a modified example (second embodiment) in which a notch 14 is provided instead of the slit 12 will be described. Next, modified examples (third to fifth embodiments) in which the layer structure differs from that of the first embodiment will be described. A combination of the second embodiment and any one of the third to fifth embodiments is also an embodiment of the present invention.

[0073] <Second embodiment> Fig. 5 is a plan view showing an adhesive tape 10 according to this embodiment. As shown in Fig. 5, the adhesive tape 10 according to this embodiment has a plurality of notches 14 provided at both ends in the width direction. In this way, an embodiment in which the notches 14 are provided as an alternative to the slits 12 is also one aspect of the present invention. In this specification, the term "notch" means a portion obtained by cutting out a part of the adhesive tape.

[0074] The shape of the notch 14 according to this embodiment is V-shaped, as shown in Fig. 5 . The shape of the notch 14 is not particularly limited, and may be U-shaped, polygonal, or the like. From the viewpoint of ease of hand cutting, it is preferable that the deepest part of the notch 14 is V-shaped (wedge-shaped). Furthermore, from the viewpoint of ease of manufacturing, it is preferable that the notch 14 is shaped in a straight line.

[0075] In this specification, the "depth of a cutout" refers to the shortest distance (straight distance) from the deepest part of the cutout to the end of the adhesive tape where the cutout is provided. In addition, in this specification, the "distance between adjacent cutouts" refers to the length between the intersections of lines drawn perpendicular to the center line of the adhesive tape in the longitudinal direction from the deepest part of each cutout.

[0076] In this embodiment, only the notches 14 are formed, but the slits 12 may be mixed with the notches 14. That is, the pressure-sensitive adhesive tape 10 according to the present invention preferably has a plurality of slits 12 and / or notches 14 formed at least on one end in the width direction.

[0077] <Third embodiment> Fig. 6 is a cross-sectional view of the pressure-sensitive adhesive tape 10 according to this embodiment when cut along the center line in the longitudinal direction. As shown in Fig. 6, the pressure-sensitive adhesive tape 10 according to this embodiment has a pressure-sensitive adhesive layer 40 formed directly on one surface of the base material layer 20. Such an embodiment is also one aspect of the present invention.

[0078] <Fourth embodiment> Fig. 7 is a cross-sectional view of the pressure-sensitive adhesive tape 10 according to this embodiment when cut along the longitudinal center line. As shown in Fig. 7, the pressure-sensitive adhesive tape 10 according to this embodiment has a pressure-sensitive adhesive layer 40 provided on each of both surfaces of a base layer 20, with a primer layer 30 interposed therebetween. Such an embodiment is also one aspect of the present invention.

[0079] Fifth Embodiment Fig. 8 is a plan view showing the pressure-sensitive adhesive tape 10 according to this embodiment. Fig. 9 is a cross-sectional view of the pressure-sensitive adhesive tape 10 according to this embodiment when cut along line B-B in Fig. 1. As shown in Fig. 9, the pressure-sensitive adhesive tape 10 according to this embodiment has slits 12 only in the base material layer 20 (in this specification, such an embodiment is also referred to as "a plurality of slits being provided at the end portions of the pressure-sensitive adhesive tape in the width direction"). The hand-tearability of the pressure-sensitive adhesive tape 10 is mainly correlated with the strength of the base material layer 20, and therefore the hand-tearability is excellent even when the slits 12 are only provided in the base material layer 20. Such an embodiment is also one aspect of the present invention.

[0080] The present invention will be described in more detail below with reference to examples. Note that the examples described below are representative examples of the present invention and should not be construed as narrowing the scope of the present invention.

[0081] <Preparation of Base Material Layer> Resin compositions were prepared by melt-kneading polyvinyl chloride resin, plasticizer, filler, and elastomer in a Banbury mixer so as to be uniformly dispersed in the formulations shown in Tables 1 to 4. The obtained resin compositions were then calendered at a roll temperature of 173°C to prepare base material layers of a predetermined thickness.

[0082] <Preparation of Pressure-Sensitive Adhesive> A pressure-sensitive adhesive was prepared by mixing 60 parts by mass (solid content) of natural rubber latex, 40 parts by mass (solid content) of natural rubber-methyl methacrylate graft polymer latex, and 135 parts by mass (solid content) of petroleum resin emulsion.

[0083] <Preparation of Adhesive Tapes> A primer was applied to one side of each substrate layer using the gravure method, and the moisture was thoroughly removed in a drying oven to prepare a primer layer. The thickness of the primer layer after drying was 0.3 μm. Next, an adhesive was applied onto the primer layer using the comma method, and the moisture was thoroughly removed in a drying oven to prepare a pressure-sensitive adhesive layer. The thickness of the adhesive layer after drying was 20 μm. This was cut to the widths shown in Tables 1 to 4 to prepare laminates (pressure-sensitive adhesive tapes without slits). The laminate was rolled, and slits shown in Tables 1 to 4 were made at both widthwise ends of the laminate using a rotary blade to prepare pressure-sensitive adhesive tapes. In this case, the slits at both ends were provided alternately at different positions along the length of the pressure-sensitive adhesive tape. The spacing between adjacent slits at one widthwise end of the pressure-sensitive adhesive tape was 12 to 15 mm. The pressure-sensitive adhesive tapes of the Examples and Comparative Examples prepared in this manner were subjected to the following tests and evaluations, and the results are shown in Tables 1 to 4.

[0084] The components used to obtain the resin composition are as follows: Polyvinyl chloride resin (PVC): Polyvinyl chloride resin 1000: "TH-1000" manufactured by Taiyo Vinyl Corporation, average degree of polymerization 1000 Polyvinyl chloride resin 1300: "TH-1300" manufactured by Taiyo Vinyl Corporation, average degree of polymerization 1300 Polyvinyl chloride resin 1700: "TH-1700" manufactured by Taiyo Vinyl Corporation, average degree of polymerization 1700

[0085] Plasticizers: DINP: "DINP" manufactured by J-Plus Corporation, diisononyl phthalate TOTM: "TOTM" manufactured by J-Plus Corporation, trioctyl trimellitate Polyester-based plasticizer: "D620" manufactured by J-Plus Corporation, adipic acid-based polyester

[0086] Fillers: Calcium carbonate: "Calcises (registered trademark) P" manufactured by Konoshima Chemical Co., Ltd., calcium carbonate, average particle size 0.18 μm Mica: "SJ-005" manufactured by Yamaguchi Mica Co., Ltd., mica, average particle size 5 μm Talc: "P-8" manufactured by Nippon Talc Co., Ltd., talc, median diameter 5 μm Silica: "FB-5D" manufactured by Denka Co., Ltd., silica, average particle size 5 μm

[0087] Elastomers: Polyester-based urethane elastomer: "ET680" manufactured by BSAF Japan Co., Ltd., tensile breaking elongation 600%, abrasion amount 15 mg Polyether-based urethane elastomer: "1180A" manufactured by BSAF Japan Co., Ltd., tensile breaking elongation 550%, abrasion amount 30 mg Polycarbonate-based urethane elastomer: "E980" manufactured by Nippon Miractoran Co., Ltd., tensile breaking elongation 470%, abrasion amount 20 mg Ethylene-vinyl acetate copolymer: "V987" manufactured by Mitsui Dow Polychemicals Co., Ltd., tensile breaking elongation 600%, abrasion amount 50 mg Chlorinated polyethylene: "Elaslen 301MA" manufactured by Resonac Co., Ltd., tensile breaking elongation 900%, abrasion amount 70 mg

[0088] The ingredients used in preparing the primer layer are as follows: Primer: "KT4612A" manufactured by E-Tech Co., Ltd., a mixed emulsion of graft polymer latex obtained by graft polymerizing methyl methacrylate onto natural rubber and acrylonitrile-butadiene copolymer emulsion.

[0089] The components used in producing the adhesive layer are as follows: Natural rubber, synthetic rubber: Natural rubber latex: "HA LATEX" manufactured by Resitex Co., Ltd. Natural rubber-methyl methacrylate copolymer latex: "MG-40S" manufactured by Resitex Co., Ltd.

[0090] Tackifying resin: Aliphatic / alicyclic copolymer petroleum resin emulsion: "AP-1100-NT" manufactured by Arakawa Chemical Industries, Ltd.

[0091] <Tensile test> A pressure-sensitive adhesive tape test piece having a width of 19 mm and a length of 200 mm was punched out from each of the laminates and pressure-sensitive adhesive tapes described above. The pressure-sensitive adhesive tape test piece was clamped and fixed in place between the chucks of a tensile tester so that the distance between the chucks was 100 mm, and a tensile test was performed in which the pressure-sensitive adhesive tape test piece was pulled at a speed of 300 mm / min in an environment of room temperature (23°C) and relative humidity (50%), and the stress and strain were measured.

[0092] (Breaking Energy) For each laminate, a stress-strain curve was created with the stress on the vertical axis and the strain on the horizontal axis for the stress and strain obtained in the tensile test described above, and the area under the curve up to the breaking point was calculated to be the breaking energy.

[0093] (Ratio of Tensile Breaking Elongation) For each laminate and each pressure-sensitive adhesive tape, the strain at break when the above-mentioned tensile test was performed was measured and defined as the tensile breaking elongation. B / A was calculated from the tensile breaking elongation (A) of the pressure-sensitive adhesive tape and the tensile breaking elongation (B) of the laminate.

[0094] (Tensile modulus converted into thickness) For each laminate, the ratio of stress to strain between 0.01% and 0.05% strain when the above-mentioned tensile test was carried out was calculated by linear regression, and the product of this value and the total thickness of the pressure-sensitive adhesive tape was calculated, and this was taken as the tensile modulus converted into thickness.

[0095] <Abrasion test> A portion of each of the above-mentioned substrate layers was cut to prepare a substrate layer sample having a length of 100 mm. First, the substrate layer sample was wrapped around a cylinder having a diameter of 10 mm twice and fixed with tape or the like. Next, the surface of the substrate layer sample was abraded using an abrasive cloth ("150AA" manufactured by Sunmec Co., Ltd., hard material: fused alumina, particle size 150 μm) at a load of 450 g and a speed of 1500 mm / min, and the abrasion distance (abrasion resistance value) until a hole was formed in the substrate layer was measured.

[0096] (Abrasion Resistance) The abrasion resistance values ​​obtained in the above-mentioned abrasion test were evaluated according to the following evaluation criteria: A: 1000 mm or more B: 700 mm or more but less than 1000 mm C: Less than 700 mm

[0097] <Flexibility Test> A portion of each of the above-mentioned pressure-sensitive adhesive tapes was cut to prepare a 150 mm long pressure-sensitive adhesive tape sample. First, the pressure-sensitive adhesive tape sample was spirally wrapped around a bundle of electric wires having a diameter of 10 mm or 15 mm, with the adhesive side facing inward so that the pressure-sensitive adhesive layer was in contact with the electric wire bundle, to prepare an electric wire tie. Next, the electric wire tie was wrapped around a mandrel having a diameter of 50 mm once, and the presence or absence of lift (gaps due to peeling) between the pressure-sensitive adhesive tape sample and the electric wire bundle was confirmed.

[0098] (Flexibility) The presence or absence of lifting between the adhesive tape sample obtained with the above flexibility and the electric wire bundle was evaluated according to the following criteria: A: No lifting occurred under both the 10 mm and 15 mm diameter electric wire bundle conditions. B: No lifting occurred under the 15 mm diameter electric wire bundle condition, but lifting occurred under the 10 mm diameter electric wire bundle condition. C: Lifting occurred under both the 10 mm and 15 mm diameter electric wire bundle conditions.

[0099] <Bleeding Test> A part of each of the above-mentioned pressure-sensitive adhesive tapes was cut to prepare a pressure-sensitive adhesive tape sample. The pressure-sensitive adhesive tape sample was stored in a storage cabinet set at a temperature of 60°C for one month, and then the appearance of the pressure-sensitive adhesive tape was observed.

[0100] (Bleeding Resistance) The observation results obtained in the above-mentioned bleed-out test were evaluated according to the following criteria: A: No change in appearance was observed B: Slight changes in appearance such as swelling, bubbles, gloss change, or plasticizer bleeding were observed C: Significant changes in appearance such as swelling, bubbles, gloss change, or plasticizer bleeding were observed

[0101] <Manual Tear Test> For each of the roll-shaped pressure-sensitive adhesive tapes described above, the pressure-sensitive adhesive tape was unfolded from the outer end, and with the outer end fixed, the pressure-sensitive adhesive tape was manually pulled in the lengthwise direction to be cut, and the ease of cutting was confirmed.

[0102] (Hand-tearability) The results obtained in the above-mentioned hand-tear test were evaluated according to the following criteria: A: Can be easily cut by hand B: Can be cut by hand without any problems C: Difficult to cut by hand

[0103] <Tape Unfolding Test> For each of the roll-shaped adhesive tapes described above, the adhesive tape was unfolded from the outer end, and the state of the adhesive tape when unfolded was confirmed.

[0104] (Spreadability) The results obtained in the above-mentioned tape spreading test were evaluated according to the following criteria: A: The adhesive tape was easily spread without being cut. C: The adhesive tape was cut and difficult to spread.

[0105] <Weighing Test> Each of the above-described pressure-sensitive adhesive tapes was weighed, and the mass per unit area was calculated.

[0106] (Lightweightness) The mass per unit area obtained in the weighing test was evaluated according to the following criteria: A: 400 g / m ２ Less than B: 400 g / m ２ Above, 550g / m ２ Less than C: 550 g / m ２ End

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[0115] REFERENCE SIGNS LIST 10 adhesive tape 11 laminate 12 slit 12a linear slit perpendicular to the widthwise end of the adhesive tape 12b linear slit not perpendicular to the widthwise end of the adhesive tape 12c curved slit 14 notch 20 substrate layer 30 primer layer 40 adhesive layer W width of adhesive tape S slit depth Sa depth of slit 12a Sb depth of slit 12b Sc depth of slit 12c D spacing between adjacent slits provided at one widthwise end of the adhesive tape Da spacing between slit 12a and slit 12b Db spacing between slit 12b and slit 12c

Claims

1. An adhesive tape having a base layer and an adhesive layer formed on at least one surface of the base layer, the base layer being composed of a resin composition containing a polyvinyl chloride resin, a plasticizer, and a filler, the base layer having a thickness of 125 to 330 μm, a plurality of slits and / or notches being provided at at least one end in the width direction of the adhesive tape, the depth S of the slits and / or notches relative to the width W of the adhesive tape satisfying S / W=0.010 to 0.25, and the breaking energy of the adhesive tape at 23°C when the slits and / or notches are not provided is 70 MJ / m ３ That's it, adhesive tape.

2. The adhesive tape according to claim 1, wherein the tensile breaking elongation A of the adhesive tape at 23°C and the tensile breaking elongation B of the adhesive tape at 23°C when the slits and / or notches are not provided satisfy the relationship B / A = 2.0 to 9.

0.

3. The adhesive tape according to claim 1 or 2, wherein the depth S of the slits and / or notches in the adhesive tape is 0.3 mm to 3 mm.

4. The adhesive tape according to claim 1 or 2, wherein the width W of the adhesive tape is 8 mm to 35 mm.

5. An adhesive tape as described in claim 1 or claim 2, wherein the spacing between adjacent slits and / or cutouts among the plurality of slits and / or cutouts provided at one end of the width direction of the adhesive tape is 12 to 15 mm.

6. The adhesive tape according to claim 1 or 2, wherein the filler comprises at least one selected from the group consisting of calcium carbonate, mica, talc, and silica.

7. The pressure-sensitive adhesive tape according to claim 1 or 2, wherein the resin composition further contains an elastomer.

8. The adhesive tape according to claim 7, wherein the elastomer comprises a urethane elastomer.

9. The adhesive tape according to claim 7, wherein the elastomer comprises a polyester-based urethane elastomer.

10. The adhesive tape according to claim 7, wherein the content of the elastomer in the resin composition is 2.0% by mass to 15.0% by mass.

11. The pressure-sensitive adhesive tape according to claim 7, wherein the elastomer includes an elastomer having a tensile breaking elongation of 550% to 900% as measured by a method in accordance with JIS K7311:1955.

12. The adhesive tape according to claim 1 or 2, wherein the adhesive tape has a tensile modulus of elasticity converted into thickness at 23°C of 150 N / mm to 450 N / mm when the slits and / or notches are not provided.

13. The adhesive tape according to claim 1 or 2, which is used for bundling wire harnesses.

14. A wire harness comprising electric wires and the adhesive tape according to claim 1 or 2 for bundling the electric wires.

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