Adhesive tape and wire harness

Abstract

The present invention addresses the problem of providing an adhesive tape that exhibits superior wear resistance and flexibility, as well as excellent bleed-out resistance.　An adhesive tape according to one embodiment of the present invention has 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, a filler, and an elastomer. The content of the plasticizer in the resin composition is 14.0 mass % or more but less than 20.0 mass %. The content of the filler in the resin composition is 10.0 mass % to 32.0 mass %.

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, automobiles and the like have become increasingly sophisticated, and there is a demand for adhesive tapes that have high abrasion resistance while maintaining flexibility.

[0005] The present invention has been made in view of the above circumstances, and provides a pressure-sensitive adhesive tape that is excellent in abrasion resistance and flexibility, and further in bleed-out resistance.

[0006] As a result of extensive investigations, the present inventors have found that the above-mentioned problems can be solved by adjusting the blending ratio of the resin composition constituting the adhesive tape, and have thus completed the present invention.

[0007] The present invention provides the following: [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, a filler, and an elastomer, wherein the content of the plasticizer in the resin composition is 14.0% by mass or more and less than 20.0% by mass, and the content of the filler in the resin composition is 10.0% by mass to 32.0% by mass. [2] The pressure-sensitive adhesive tape according to [1], wherein the pressure-sensitive adhesive tape has an abrasion resistance of 800 mm or more measured in accordance with ISO 6722-1 (2001) under conditions of a load of 450 g and a movement speed of 1500 mm / min. [3] The pressure-sensitive adhesive tape according to [1] or [2], wherein the elastomer comprises a urethane elastomer. [4] The pressure-sensitive adhesive tape according to any of [1] to [3], wherein the elastomer comprises a polyester-based urethane elastomer. [5] The pressure-sensitive adhesive tape according to any one of [1] to [4], wherein the content of the elastomer in the resin composition is 2.0% by mass to 15.0% by mass. [6] The pressure-sensitive adhesive tape according to any one of [1] to [5], wherein the plasticizer comprises at least one of a carboxylic acid ester plasticizer and a polyester plasticizer. [7] The pressure-sensitive adhesive tape according to any one of [1] to [6], wherein the filler comprises at least one selected from the group consisting of calcium carbonate, mica, talc, and silica. [8] The pressure-sensitive adhesive tape according to any one of [1] to [7], wherein the elastomer comprises an elastomer having a tensile elongation at break of 550% to 900% as measured in accordance with JIS K7311:1955. [9] The pressure-sensitive adhesive tape according to any one of [1] to [8], wherein the elastomer comprises an elastomer having an abrasion loss of 10 to 40 mg as measured in accordance with JIS K7204:1999.

[10] The pressure-sensitive adhesive tape according to any one of [1] to [9], wherein the pressure-sensitive adhesive tape has a tensile modulus of elasticity converted into a thickness at 23° C. of 150 N / mm to 450 N / mm.

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

[10] , which is used for bundling a wire harness.

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

[11] that bundles the electric wires.

[0008] According to the present invention, it is possible to provide a pressure-sensitive adhesive tape that is excellent in abrasion resistance, flexibility, and bleed-out resistance.

[0009] 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.

[0010] <Explanation of Terms> In this specification, for example, the expression "X to Y" means that X or more and Y or less.

[0011] 1. Pressure-sensitive adhesive tape The pressure-sensitive adhesive tape according to this embodiment has a base layer and a pressure-sensitive adhesive layer. The pressure-sensitive adhesive layer according to this embodiment is formed on at least one surface of the base layer. Typically, the pressure-sensitive adhesive layer according to this embodiment is preferably formed on one surface (one side) of the base layer. Furthermore, in the pressure-sensitive adhesive tape according to this embodiment, the pressure-sensitive adhesive layer may be provided directly on at least one surface of the base layer, or the pressure-sensitive adhesive layer may be provided via another layer (for example, a primer layer described below).

[0012] 1.1 Base Material Layer The base material layer according to this embodiment is preferably made of a resin composition containing a polyvinyl chloride resin, a plasticizer, a filler, and an elastomer.

[0013] 1.1.1 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, improving the breaking stress of the pressure-sensitive adhesive tape and providing 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.

[0014] 1.1.2 Plasticizer The plasticizer according to the present embodiment is not particularly limited as long as it can impart flexibility to the base layer. 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.

[0015] 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 risk of pinholes occurring in the substrate layer. Furthermore, from the viewpoint of cost, phthalate esters are preferred as plasticizers according to this embodiment.

[0016] 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.

[0017] 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.

[0018] 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.

[0019] 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.

[0020] 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. 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 and less than 20.0% by mass, more preferably 15.0 to 19.9% ​​by mass. 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 herein. When the lower limit of the plasticizer content is within this range, the adhesive tape has improved breaking energy and tensile breaking elongation, and is also excellent in flexibility.When the upper limit of the plasticizer content is within this range, the adhesive tape has improved breaking stress and is also excellent in bleed-out resistance.

[0021] 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, based on 100 parts by mass of polyvinyl chloride resin. Based on 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 are improved.

[0022] 1.1.3 Filler The filler according to this embodiment is not particularly limited as long as it can increase the amount of the base layer and improve its hardness. As the filler according to this embodiment, an inorganic filler is preferred. This type of filler can achieve both the reinforcing effect and flexibility of the base layer.

[0023] 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 has excellent abrasion resistance.

[0024] 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.

[0025] 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. 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 to 32.0% by mass, and more preferably 12.0 to 31.0% by mass. The filler content in the resin composition, when the polyvinyl chloride resin is taken as 100% by mass, 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 has excellent abrasion resistance. When the upper limit of the filler content is such a value, the pressure-sensitive adhesive tape has excellent abrasion resistance and flexibility, and the tensile elongation at break is improved.

[0026] 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 numerical values ​​exemplified here. When the filler content is within this range, the pressure-sensitive adhesive tape has excellent flexibility and improved tensile elongation at break.

[0027] 1.1.4 Elastomer The resin composition according to this embodiment contains an elastomer. When an elastomer is contained, the pressure-sensitive adhesive tape has excellent abrasion resistance. The elastomer according to this 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 this embodiment preferably contains a urethane elastomer. When the elastomer is of this type, the breaking energy and tensile breaking elongation of the pressure-sensitive adhesive tape are improved.

[0028] 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 are improved.

[0029] In the resin composition according to this embodiment, when the resin composition is taken as 100% by mass, the elastomer content is preferably 2.0% by mass or more and preferably 15.0% by mass or less. In the resin composition according to this embodiment, when the resin composition is taken as 100% by mass, the elastomer content is preferably 2.0 to 15.0% by mass and more preferably 2.5 to 12.0% by mass. When the resin composition is taken as 100% by mass, 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 adhesive tape has improved breaking energy and tensile breaking elongation, and excellent abrasion resistance. When the upper limit of the elastomer content is within this range, the pressure-sensitive adhesive tape has excellent weather resistance, hydrolysis resistance, abrasion resistance, and bleed-out resistance.

[0030] 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 the 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 the polyvinyl chloride resin. The amount of elastomer present in the resin composition, per 100 parts by mass of the 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 has excellent flexibility and abrasion resistance. When the upper limit of the elastomer content is within this range, the pressure-sensitive adhesive tape has excellent weather resistance, hydrolysis resistance, abrasion resistance, and bleed-out resistance.

[0031] 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 has excellent abrasion resistance.

[0032] The elastomer according to this embodiment preferably has an abrasion amount of 10 mg or more and 40 mg or less. The abrasion 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 abrasion amount of the elastomer can be measured by a method in accordance with JIS K7204:1999. When the abrasion amount of the elastomer is within this range, the pressure-sensitive adhesive tape has excellent abrasion resistance.

[0033] 1.1.5 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.

[0034] 1.2 Adhesive Layer The adhesive of the adhesive layer 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 a 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).

[0035] 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.

[0036] 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.

[0037] The rubber-based adhesive can be selected from solvent-based and emulsion-based adhesives, but emulsion-based adhesives that generate less VOCs (volatile organic compounds) are preferred.

[0038] 1.3 Other Layers The pressure-sensitive adhesive tape according to this embodiment may further include other layers as long as the effects of the present invention are not impaired. The pressure-sensitive adhesive tape according to this embodiment may further include a primer layer between the substrate layer and the pressure-sensitive adhesive layer for the purpose of improving the adhesion between the substrate layer and the pressure-sensitive adhesive layer.

[0039] As the primer for the primer layer according to this embodiment, a mixture of a graft polymer obtained by graft polymerizing methyl methacrylate onto natural rubber and an acrylonitrile-butadiene copolymer is preferred.

[0040] 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 substrate layer 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 the deformation of the substrate layer, making delamination less likely to occur.

[0041] 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.

[0042] 2. Method for Producing the Adhesive Tape The adhesive tape according to this embodiment can be produced, for example, by laminating an undercoat layer and an adhesive layer in this order on at least one surface of a substrate layer.

[0043] 2.1 Manufacturing Method of Base Material 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 material layer according to this embodiment can be manufactured by forming the resin composition into a predetermined thickness using a calendar molding machine or the like. 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.

[0044] The thickness of the substrate layer according to this embodiment is preferably 125 to 330 μm. The thickness of the substrate layer 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 according to this embodiment has excellent abrasion resistance and therefore has sufficient strength even at such a thickness.

[0045] 2.2 Manufacturing Method of Primer Layer and Pressure-Sensitive Adhesive Layer In one embodiment of the manufacturing method of the pressure-sensitive adhesive tape according to the present invention, a primer is first applied to at least one surface of the substrate layer, and the solvent (e.g., moisture) is thoroughly removed in a drying oven. Next, a pressure-sensitive adhesive is applied onto the primer layer, and the solvent (e.g., moisture) is thoroughly removed in a drying oven, thereby obtaining a pressure-sensitive adhesive tape. Examples of the primer application method include gravure, spray, kiss roll, bar, and knife methods. Examples of the pressure-sensitive adhesive application method include comma, lip die, gravure, roll, and slot die methods.

[0046] The thickness of the primer layer according to this embodiment is not particularly limited as long as it can improve the adhesion between the substrate layer and the pressure-sensitive adhesive layer. The thickness of the primer layer is, for example, 0.1 to 1.0 μm, and more preferably 0.3 to 0.5 μm.

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

[0048] The total thickness of the pressure-sensitive adhesive tape according to the present embodiment is preferably 150 to 350 μm. The total thickness of the pressure-sensitive adhesive tape 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 numerical values ​​exemplified here. When the total thickness of the pressure-sensitive adhesive tape according to the present embodiment is within this range, the pressure-sensitive adhesive tape has excellent lightness and can be suitably used for wire harnesses in automobiles, etc.

[0049] 3. Characteristics of the Adhesive Tape 3.1 Breaking Energy The breaking energy of the adhesive tape according to this embodiment at 23°C is preferably large. The breaking energy of the adhesive tape at 23°C can be measured by a method in accordance with JIS K7127:1999. The breaking energy of the adhesive tape at 23°C can be measured, for example, by the following procedures: (1) clamping and fixing an adhesive tape test piece having a width of 19 mm and a length of 200 mm in the chuck portions of a tensile tester so that the chuck distance is 100 mm; (2) conducting a tensile test in which the adhesive tape test piece is pulled at a speed of 300 mm / min in an environment of room temperature of 23°C and relative humidity of 50%, and 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 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 according to this embodiment is not particularly limited, but is preferably 200 MJ / m ３ The breaking energy of the pressure-sensitive adhesive tape at 23°C may 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 pressure-sensitive adhesive tape is within this range, the pressure-sensitive adhesive tape has excellent abrasion resistance and flexibility. The breaking energy of the pressure-sensitive adhesive tape can be controlled by adjusting the type and amount of the compounding in the resin composition constituting the base layer, in particular the type and amount of the elastomer or the amount of the plasticizer.

[0050] 3.2 Tensile Breaking Elongation The pressure-sensitive adhesive tape according to this embodiment preferably has a large tensile breaking elongation at 23°C. The tensile breaking elongation of the pressure-sensitive adhesive tape at 23°C can be measured by a method in accordance with JIS K7127:1999. The tensile breaking elongation of the pressure-sensitive adhesive tape at 23°C can be, for example, the strain at break when a tensile test is performed using the same procedure as in the above-mentioned "3.1 Breaking Energy". The tensile breaking elongation of the pressure-sensitive adhesive tape according to this embodiment is preferably 200% or more, and more preferably 250% or more. The upper limit of the tensile breaking elongation of the pressure-sensitive adhesive tape according to this embodiment at 23°C is not particularly limited, but may be 400%. The tensile breaking elongation of the pressure-sensitive adhesive tape at 23° C. may be, for example, 200, 210, 220, 230, 240, 260, 270, 280, 290, 300, 310, 320, 330, 320, 330, 340, 350, 360, 370, 380, 390, or 400%, or may be within a range between any two of the values ​​exemplified here. When the tensile breaking elongation of the pressure-sensitive adhesive tape is in such a range, the pressure-sensitive adhesive tape has excellent abrasion resistance and flexibility.

[0051] 3.3 Breaking Stress The breaking stress of the pressure-sensitive adhesive tape according to the present embodiment at 23°C is preferably large. The breaking stress of the pressure-sensitive adhesive tape at 23°C can be measured by a method in accordance with JIS K7127:1999. The breaking stress of the pressure-sensitive adhesive tape at 80°C can be, for example, the stress at break when a tensile test is performed using the same procedure as in "3.1 Breaking Energy" above. The breaking stress of the pressure-sensitive adhesive tape according to the present embodiment at 23°C is preferably 16 MPa or more, more preferably 18 MPa or more. The upper limit of the breaking stress of the pressure-sensitive adhesive tape according to the present embodiment at 80°C is not particularly limited, but may be 30 MPa. The breaking stress of the pressure-sensitive adhesive tape at 80°C may be, for example, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, or 30 MPa, or may be within a range between any two of the values ​​exemplified herein. When the lower limit of the breaking stress of the adhesive tape is within this range, the adhesive tape has excellent abrasion resistance.When the upper limit of the breaking stress of the adhesive tape is within this range, the adhesive tape has excellent flexibility.

[0052] 3.4 Thickness-equivalent Tensile Modulus The thickness-equivalent tensile modulus of the pressure-sensitive adhesive tape according to the present embodiment at 23°C is preferably 150 to 450 N / mm. The thickness-equivalent tensile modulus of the pressure-sensitive adhesive tape at 23°C can be measured by a method in accordance with 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" 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 converted into thickness 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 converted into thickness is such a value, the pressure-sensitive adhesive tape has excellent abrasion resistance. When the upper limit of the tensile modulus of elasticity of the pressure-sensitive adhesive tape converted into thickness is such a value, the pressure-sensitive adhesive tape has excellent flexibility.

[0053] 3.5 Abrasion Resistance The pressure-sensitive adhesive tape 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 fixing 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 800 mm or more, and more preferably 1000 mm or more. The abrasion resistance value of the pressure-sensitive adhesive tape may be, for example, 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 is in such a range, a pressure-sensitive adhesive tape with excellent abrasion resistance can be provided.

[0054] 3.6 Flexibility The pressure-sensitive adhesive tape according to this 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 contacts the bundle of electric wires, twice 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 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 has such flexibility, it can maintain binding even with thin bundles of electric wires.

[0055] 3.7 Bleed-out Resistance The pressure-sensitive adhesive tape according to this embodiment preferably has excellent bleed-out resistance. The bleed-out resistance of a pressure-sensitive adhesive tape can be evaluated, for example, by storing the pressure-sensitive adhesive tape at a set temperature of 60°C for one month and then observing the appearance of the pressure-sensitive adhesive tape. It is preferable that the pressure-sensitive adhesive tape 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 a pressure-sensitive adhesive tape has such bleed-out resistance, it can be used continuously for a long period of time.

[0056] 3.8 Lightweight The pressure-sensitive adhesive tape 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 is preferably lightweight (600 g / m). ２ Preferably, the weight is 400 g / m or less. ２ When the pressure-sensitive adhesive tape has such a light weight, it can be suitably used as a member for automobiles and the like.

[0057] 4. Method of Use The pressure-sensitive adhesive tape 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 an adhesive tape for bundling the electric wires. The pressure-sensitive adhesive tape 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 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.

[0058] 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.

[0059] <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.

[0060] <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.

[0061] <Preparation of Adhesive Tape> A primer was applied to one side of each substrate layer by gravure coating, 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 by comma coating, and the moisture was thoroughly removed in a drying oven to prepare an adhesive tape. The thickness of the adhesive layer after drying was 20 μm. The adhesive tapes of the Examples and Comparative Examples prepared in this manner were subjected to the tests and evaluations described below, and the results are shown in Tables 1 to 4.

[0062] 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

[0063] 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

[0064] 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

[0065] 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

[0066] 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.

[0067] 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.

[0068] Tackifying resin: Aliphatic / alicyclic copolymer petroleum resin emulsion: "AP-1100-NT" manufactured by Arakawa Chemical Industries, Ltd.

[0069] <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 pressure-sensitive adhesive tapes described above. The pressure-sensitive adhesive tape test piece was clamped and fixed in the chuck portions 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 of 23°C and relative humidity of 50%, and the stress and strain were measured.

[0070] (Breaking Energy) 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 above-mentioned tensile test, and the area under the curve up to the breaking point was calculated to be the breaking energy.

[0071] (Tensile Elongation at Break) The strain at break when the above-mentioned tensile test was carried out was measured and taken as the tensile elongation at break.

[0072] (Breaking Stress) The stress at break when the above-mentioned tensile test was carried out was measured and taken as the breaking stress.

[0073] (Tensile modulus converted into thickness) When the above-mentioned tensile test was carried out, the ratio of stress to strain between 0.01 and 0.05% 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.

[0074] <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.

[0075] (Wear Resistance) The wear distance obtained in the above-mentioned wear test was evaluated according to the following evaluation criteria: A: 1000 mm or more B: 800 mm or more but less than 1000 mm C: Less than 800 mm

[0076] <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.

[0077] (Flexibility) The presence or absence of lifting between the adhesive tape sample obtained with the above flexibility and the wire bundle was evaluated according to the following criteria: A: No lifting occurred under both the 10 mm and 15 mm diameter wire bundle conditions. B: No lifting occurred under the 15 mm diameter wire bundle condition, but lifting occurred under the 10 mm diameter wire bundle condition. C: Lifting occurred under both the 10 mm and 15 mm diameter wire bundle conditions.

[0078] <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.

[0079] (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

[0080] <Weighing Test> Each of the above-described pressure-sensitive adhesive tapes was weighed, and the mass per unit area was calculated.

[0081] (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 End

[0082]

[0083]

[0084]

[0085]

[0086]

Claims

1. An adhesive tape having a base layer and an 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, a filler, and an elastomer, the content of the plasticizer in the resin composition is 14.0% by mass or more and less than 20.0% by mass, and the content of the filler in the resin composition is 10.0% by mass to 32.0% by mass.

2. The adhesive tape according to claim 1, wherein the adhesive tape has an abrasion resistance of 800 mm or more when measured in accordance with ISO 6722-1 (2001) under conditions of a load of 450 g and a moving speed of 1500 mm / min.

3. The adhesive tape according to claim 1 or 2, wherein the elastomer comprises a urethane elastomer.

4. The adhesive tape according to claim 1 or 2, wherein the elastomer comprises a polyester-based urethane elastomer.

5. The adhesive tape according to claim 1 or 2, wherein the content of the elastomer in the resin composition is 2.0% by mass to 15.0% by mass.

6. The adhesive tape according to claim 1 or 2, wherein the plasticizer comprises at least one of a carboxylic acid ester plasticizer and a polyester plasticizer.

7. 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.

8. The pressure-sensitive adhesive tape according to claim 1 or 2, 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.

9. The adhesive tape according to claim 1 or 2, wherein the elastomer includes an elastomer having an abrasion amount of 10 to 40 mg measured according to a method in accordance with JIS K7204:1999.

10. 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.

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

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

Images