Adhesive tape

Abstract

Provided is adhesive tape having high functionality, followability, and hand tearability. This adhesive tape comprises a functional layer, a base material layer, and an adhesive layer in sequence, wherein the base material layer includes base cloth and a laminate layer provided on the adhesive layer side of the base cloth. In the adhesive tape, the functional layer contains a binder resin and functional particles, and the binder resin includes any one of a (meth)acrylic binder resin, a urethane-based binder resin, an epoxy-based binder resin, and a polyester-based binder resin.

Description

adhesive tape

[0001] The present invention relates to a functional pressure-sensitive adhesive tape.

[0002] In recent years, adhesive tapes composed of various functional layers, a base layer, and an adhesive layer have been developed, and these functional adhesive tapes can be used for a variety of purposes. Methods for providing the functional layer include a method of mixing a functional component, for example, functional particles such as conductive particles, with a binder and dispersing the mixture in an adhesive, a method of applying the functional layer to the surface of a base layer, a method of vapor deposition, a method of extruding the functional layer as a melt and laminating it, and a transfer method (see, for example, Patent Documents 1 and 2).

[0003] On the other hand, adhesive tapes have traditionally been required to have properties such as the ability to conform to curved, rough, and uneven surfaces, ease of hand tearing, etc. To impart these excellent properties to adhesive tapes, paper substrates and fabrics such as woven fabrics, knitted fabrics, and nonwoven fabrics have been used as the substrate layer of adhesive tapes.

[0004] JP 2014-001297 A JP 2017-134349 A

[0005] It has been difficult for functional adhesive tapes using a base fabric as a substrate to fully demonstrate their functions. For example, when a functional component is contained in the adhesive layer, the functional component may migrate to the adherend, preventing the tape from functioning or reducing adhesive strength. Furthermore, when a functional component is contained in the base fabric, the functional component may penetrate between the fibers and prevent the tape from fulfilling its function. Furthermore, when a base fabric having a laminate layer is selected to improve the strength of the base fabric, and the functional component is contained in the laminate layer, the laminate layer is typically formed by high-temperature treatment, which can result in a decrease in the functionality of the functional component and a narrowing of the selection of functional components.

[0006] The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide an adhesive tape that combines high functionality, conformability, and ease of manual tearing.

[0007] The inventors have discovered that an adhesive tape with high functionality, conformability, and hand-tearability can be obtained by covering the surface of a base fabric with a laminate layer and constructing the adhesive tape in the following order: a functional layer having a functional component, a base fabric, a laminate layer, and an adhesive layer.

[0008] That is, the present invention includes the following aspects. [1] A pressure-sensitive adhesive tape having, in this order, a functional layer, a base layer, and an adhesive layer, wherein the base layer comprises: a base fabric; and a laminate layer provided on the adhesive layer side of the base fabric. [2] The pressure-sensitive adhesive tape according to [1], wherein the functional layer contains a binder resin and functional particles, and the binder resin contains any one of a (meth)acrylic binder resin, a urethane binder resin, an epoxy binder resin, and a polyester binder resin. [3] The pressure-sensitive adhesive tape according to [1] or [2], wherein the base fabric is a woven fabric or a knitted fabric, and the laminate layer contains a polyethylene resin. [4] The pressure-sensitive adhesive tape according to any one of [1] to [3], wherein the functional layer has one or more functions selected from antireflection, antiglare, antistatic, antifouling, reinforcement, ultraviolet absorption, visible light absorption, electrical conductivity, insulation, antistatic, gas barrier, deodorizing, drip resistance, slip resistance, abrasion resistance, electromagnetic wave shielding, printability, fluorescence, hologram properties, and colorability. [5] The pressure-sensitive adhesive tape according to any one of [1] to [4], wherein the functional layer has one or more functions selected from fluorescence, hologram properties, and colorability.

[0009] According to this embodiment, an adhesive tape having high functionality, conformability, and ease of hand tearing can be obtained.

[0010] 1 is a schematic cross-sectional view showing the cross-sectional structure of a pressure-sensitive adhesive tape according to an embodiment of the present invention.

[0011] An adhesive tape according to an embodiment of the present invention will be described with reference to the drawings. Fig. 1 is a schematic cross-sectional view showing the cross-sectional structure of an adhesive tape according to an embodiment of the present invention. As shown in Fig. 1, the adhesive tape 1 according to this embodiment includes a functional layer 10, a base fabric 11, a laminate layer 12, and an adhesive layer 13, in this order. As will be described later, the functional layer 10 may contain functional particles 14 and a binder resin 15.

[0012] <Functional Layer> In the pressure-sensitive adhesive tape of this embodiment, the functional layer 10 is a layer for imparting functions (characteristics) according to the application and purpose of the pressure-sensitive adhesive tape. Examples of functional layers include those having one or more functions selected from anti-reflection, anti-glare, anti-static, anti-fouling, reinforcement, ultraviolet absorption, visible light absorption, electrical conductivity, insulating properties, anti-static, gas barrier properties, deodorizing properties, drip resistance, slip resistance, abrasion resistance, electromagnetic wave shielding, printability, fluorescence, holographic properties, and colorability. Among these, functional layers having one or more functions selected from fluorescence, holographic properties, and colorability are preferred, particularly from the viewpoint of improving functionality (visibility). Alternatively, the functional layer may have all of fluorescence, holographic properties, and colorability.

[0013] From the viewpoint of ease of handling, the components constituting the functional layer preferably contain a binder resin and functional particles. The functional layer can contain one or more types of functional particles and binder resins. The binder resin preferably contains any of a (meth)acrylic binder resin, a urethane binder resin, an epoxy binder resin, and a polyester binder resin. Among these, it is preferable to contain an acrylic binder resin or a urethane binder resin, since the performance of the functional particles is less likely to be impaired.

[0014] The (meth)acrylic binder resin may be a (co)polymer of an acrylic acid ester or a methacrylic acid ester. The constituent units of the (co)polymer preferably include structural units derived from carboxyl group-containing monomers. Other structural units may include structural units derived from (meth)acrylic acid alkyl ester monomers, structural units derived from functional group-containing monomers other than carboxyl group-containing monomers, and structural units derived from other copolymerizable monomers. Commercially available (meth)acrylic binder resins include, for example, "MSB-N" and "Clear 240N" manufactured by Matsui Shikishoku Kagaku Kogyosho Co., Ltd., "Nikasol RX7022B" manufactured by Nippon Carbide Corporation, and "Jurymer FC-80" and "Jurymer ET-410" manufactured by Toagosei Co., Ltd. Urethane binder resins include polyurethanes produced by reacting polyesters or polyethers with polyisocyanates. Examples of commercially available urethane binder resins include "SWR-N" manufactured by Matsui Shikishoku Kagaku Kogyosho Co., Ltd., Superflex 110 and 460, both manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd., "Toatan S" (polycarbonate polyester polyurethane) manufactured by Tohpe Corporation, "Superflex (registered trademark) 460" (non-yellowing polycarbonate polyurethane) manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd., and "Superflex (registered trademark) 740" (yellowing polyester polyurethane) manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd.

[0015] The content of the binder resin in the functional layer (in terms of solid content) is preferably 20% by mass or more, more preferably 30% by mass or more, of the total mass of the functional layer, and is preferably 80% by mass or less, more preferably 70% by mass or less.

[0016] The functional layer preferably further contains a crosslinking agent. By containing the crosslinking agent, the functional layer can prevent the functional particles from being separated from the binder resin. The crosslinking agent is not particularly limited, and examples thereof include isocyanate-based crosslinking agents, methylol-based crosslinking agents, ethyleneimine-based crosslinking agents, aziridine-based crosslinking agents, and metal salts. Among these, aziridine-based crosslinking agents are preferred in terms of low-temperature curing properties.

[0017] The content of the crosslinking agent in the functional layer is preferably 0.1 to 10 parts by mass, more preferably 2 to 6 parts by mass, per 100 parts by mass of the binder resin. If the content is less than 0.1 part by mass, the strength of the coating film decreases due to insufficient curing. On the other hand, if the content exceeds 10 parts by mass, the pot life is shortened, handling properties are reduced, and curing shrinkage occurs due to excessive curing.

[0018] Furthermore, the functional layer preferably contains additives as needed. Examples of additives include viscosity reducers, thickeners, solvents, dispersants, etc. The functional layer can contain one or more additives. By containing an additive, it is possible to impart an appropriate viscosity to the binder resin according to the physical properties, particle size, and shape of the functional particles. This allows the application of an appropriate amount of the functional layer-forming composition containing the binder resin and the functional particles.

[0019] The functional particles can be appropriately selected from general-purpose materials (particles) depending on the function to be imparted to the functional layer. Examples of functional particles include solid particles having functionality such as a refractive index adjusting material such as a high refractive index material or a low refractive index material when imparting antireflection properties, an antiglare agent when imparting antiglare properties, an antistatic agent when imparting antistatic properties, and an antifouling agent when imparting antifouling properties.

[0020] The shape of the functional particles is not particularly limited, and may include polygonal, plate-like, flake-like, angular, needle-like, rod-like, porous, lamellar, and scale-like shapes. The average particle size of the functional particles is preferably 0.1 μm to 500 μm, more preferably 5 μm to 100 μm. If the particle size is less than 0.1 μm, the particles tend to aggregate, making it difficult to disperse them in the binder resin. On the other hand, if the particle size exceeds 500 μm, the functional particles do not fully exhibit their capabilities in the adhesive tape. Furthermore, if the average particle size of the functional particles is less than 5 μm, it is desirable to disperse them in a solution beforehand. The average particle size can be measured, for example, by observing the particles using transmission electron microscope (TEM) or scanning electron microscope (SEM) photographs taken at 500,000 to 2,000,000 magnifications, and averaging the particle sizes of 100 observed particles to determine the average particle size. When the shape of the functional particle is a shape that includes the concept of aspect ratio, such as a spheroid or rod having a short diameter and a long diameter, the particle size of the functional particle is the average value of the short diameter and the long diameter.

[0021] The thickness of the functional layer is not particularly limited, but is preferably 20 μm or more and 100 μm or less from the viewpoint of functional layer adhesion.

[0022] <Substrate Layer> In the pressure-sensitive adhesive tape of this embodiment, the substrate layer comprises a base fabric and a laminate layer provided on the adhesive layer side of the base fabric. The base fabric is not particularly limited, and known base fabrics for pressure-sensitive adhesive tapes can be used. Examples of the form of the base fabric include breathable films and sheets such as porous films and porous sheets; fabrics such as woven fabrics, knitted fabrics, and nonwoven fabrics; and laminates thereof. In the pressure-sensitive adhesive tape of this embodiment, such base fabrics may be used alone or in layers of two or more. From the viewpoint of ease of hand-tear, the base fabric is preferably a woven or knitted fabric. The term "woven fabric" refers to a fabric woven by weaving a predetermined number of parallel warp threads on a loom and continuously crossing sizing-applied weft threads for resistance to friction using a shuttle, air pressure, hydraulic pressure, or the like. The term "knitted fabric" refers to a sheet-like structure made by weaving fibers. Examples of knitting methods for knitted fabrics include weft knitting (plain knitting, rib knitting, or purl knitting), warp knitting (single tricot knitting, single cord knitting, or single atlas knitting), and the like.

[0023] (Warp) The warp yarns used for the woven fabric are not particularly limited as long as they are materials commonly used in the relevant field. For example, synthetic fibers such as polypropylene (PP), polyethylene terephthalate (PET), nylon (Ny), etc.; rayons such as cuprammonium rayon and viscose rayon; synthetic fibers such as cupra, polynosic, and lyocell; plant-derived fibers such as cotton, kapok, flax, ramie, hemp, jute, Manila hemp, sisal, palm, coconut palm, and cupra; or blends thereof can be used. Among these, recycled fibers and synthetic fibers are preferred in terms of functional layer adhesion and appearance, and rayon yarns and PET yarns are more preferred.

[0024] The warp fineness is preferably 15 denier or more and 200 denier or less, more preferably 20 denier or more and 180 denier or less. By using the above warp fineness, it is possible to ensure appropriate hand-tearability while maintaining the vertical strength of the pressure-sensitive adhesive tape. Furthermore, the number of warp threads per inch is preferably 10 to 100, more preferably 30 to 50. By using the above number of warp threads per inch, a good balance between base fabric strength, hand-tearability, and elongation is achieved.

[0025] (Weft) The weft in the woven fabric is not particularly limited as long as it is made of a material that is used in the relevant field, and the same materials as those for the warp can be used.

[0026] When false-twisted yarn or woolly processed yarn is used for the weft, the weft fineness is preferably 30 denier or more and 250 denier or less, and more preferably 50 denier or more and 150 denier or less. The above-mentioned weft fineness improves the coatability of the functional layer. When flat yarn is used for the weft, the weft fineness is preferably 50 denier or more and 500 denier or less, and more preferably 100 denier or more and 300 denier or less. Furthermore, from the viewpoint of functional layer adhesion, the weft thread count is preferably 10 to 100 threads per inch, and more preferably 30 to 50 threads per inch.

[0027] These forming surfaces of the base fabric may be subjected to physical or chemical anchor treatment to increase the bonding strength with the laminate layer or adhesive layer. Physical treatments include corona treatment, UV treatment, sputtering treatment, etc., and chemical treatments include coating with a resin selected from organotitanium-based, isocyanate-based, polyethyleneimine-based, polybutadiene-based, etc.

[0028] (Laminate Layer) The laminate layer in the pressure-sensitive adhesive tape of the present embodiment is preferably made of a thermoplastic resin containing polyethylene (polyethylene resin, polyethylene-based resin). Furthermore, from the viewpoint of adhesion between the base fabric and the laminate layer, it is more preferably made of a thermoplastic resin containing a polyethylene resin and an ethylene-vinyl acetate copolymer (EVA) and / or an ethylene-ethyl acrylate copolymer (EEA), and even more preferably made of a thermoplastic resin containing a polyethylene resin and an ethylene-ethyl acrylate copolymer (EEA).

[0029] Polyethylene has a melting point of 100 to 150°C, which is lower than other general-purpose thermoplastic resins such as polypropylene, polyethylene terephthalate, nylon, etc. Therefore, the melting temperature of the resin when forming the laminate layer on the base fabric is low, which helps reduce manufacturing costs.

[0030] As the polyethylene, low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), high-density polyethylene (HDPE), etc. can be used, and a mixture of these types can also be used. By selecting low-density polyethylene, it is possible to improve adhesion to the base fabric, and by selecting high-density polyethylene, it is possible to impart a certain hardness to the laminate layer and improve the handleability of the adhesive tape. For example, by selecting the resin composition, it is possible to achieve various properties required of the adhesive tape.

[0031] In the pressure-sensitive adhesive tape of this embodiment, low-density polyethylene has a density of 0.911 g / cm ３ exceeds 0.925 g / cm ３ High density polyethylene has a density of 0.940 g / cm ３ It means polyethylene having a density exceeding 0.925 g / cm ３ exceeds 0.940 g / cm ３ The following medium density polyethylenes may also be used as part of the high density polyethylene:

[0032] The content of polyethylene in the laminate layer is preferably 60 to 95 parts by mass, more preferably 70 to 90 parts by mass. The content of EVA and / or EEA is preferably 5 to 40 parts by mass, more preferably 10 to 30 parts by mass. The total content of polyethylene and EVA and / or EEA in the laminate layer is 100 parts by mass.

[0033] The amount of resin in the laminate layer can be determined depending on the adhesive strength with the base fabric and stiffness required for the adhesive tape. ２ More than 40 g / m ２ The upper limit of the resin amount may be determined depending on the function required of the adhesive tape, but from the viewpoint of hand tearability, the total resin amount is preferably 150 g / m ２ Preferably, 100 g / m or less ２ The following is more preferred:

[0034] The thickness of the laminate layer is preferably 5 μm or more and 300 μm or less, more preferably 40 μm or more and 100 μm or less, from the viewpoint of ease of hand tearing.

[0035] The surface of the base fabric on the adhesive layer side may be subjected to an adhesion-facilitating treatment, if necessary. Examples of adhesion-facilitating treatments include application of an anchor coating agent, corona treatment, etching treatment, plasma treatment, sandblasting treatment, etc. One or a combination of two or more of these may be selected.

[0036] (Adhesive Layer) In the pressure-sensitive adhesive tape of the present embodiment, the adhesive layer contains an adhesive. The adhesive is not particularly limited, and examples thereof include acrylic adhesives, urethane adhesives, rubber adhesives, polyester adhesives, silicone adhesives, and polyvinyl ether adhesives. Among these, rubber adhesives are preferred because of their low adherend selectivity.

[0037] In terms of adhesion to the laminate layer, rubber-based adhesives are preferably those whose main component is natural rubber, synthetic rubber, or a mixture of natural and synthetic rubber. Natural rubber is solidified latex extracted from the rubber tree Hevea brasiliensis. Natural rubber is broadly classified into sheet rubber, which is coagulated with an acid such as formic acid and dried to form a sheet, and block rubber, which is produced by crushing and washing the cup lump obtained by natural coagulation in a cup used for extracting latex at a rubber plantation, repeatedly drying it, and pressing it.

[0038] Sheet rubber is classified according to the "International Quality Packaging Standard for Various Grades of Natural Rubber" (commonly known as the "Green Book"), with varieties determined by raw materials and manufacturing methods. Examples include ribbed smoked sheet (RSS), which is made by smoking a sheet and drying it, and crepe, which is made by thoroughly washing the coagulated material with water and drying it with hot air. Sheet rubber is classified into grades such as RSS #3, RSS #1, pale crepe, and sole crepe. When using sheet rubber as the adhesive component of this embodiment, any one of these grades may be used alone, or multiple grades may be used in combination. Block rubber is natural rubber that is made by washing and drying coagulated small rubber particles, press-molding them, and grading them according to the ISO standard (ISO 2000). Grades include the standard grades TSR20 and TSR10, the TSRCV grade, which contains hydroxylamine hydrochloride as a viscosity stabilizer, and the TSRL grade, which contains sodium metabisulfite as a discoloration inhibitor. When block rubber is used as the adhesive component of this embodiment, any one of these grades may be used alone, or a plurality of grades may be used in combination.

[0039] Examples of synthetic rubbers include butyl rubber, polyisobutylene rubber, isoprene rubber, styrene-isobutylene-styrene block copolymer, styrene-isoprene block copolymer, styrene-butadiene rubber, styrene-isoprene-styrene block copolymer, styrene-butadiene-styrene block copolymer, styrene-ethylene-butylene-styrene block copolymer, styrene-ethylene-propylene-styrene block copolymer, styrene-ethylene-propylene block copolymer, etc. Any one of these may be used alone, or a plurality of these may be used in combination.

[0040] The rubber-based pressure-sensitive adhesive preferably contains a tackifying resin. Specific examples of tackifying resins include rosin-based resins such as rosin and rosin ester; terpene-based resins such as terpene resins, aromatic-modified terpene resins, hydrogenated terpene resins, and terpene-phenolic resins; polymerized resins such as aliphatic petroleum resins, aromatic petroleum resins, copolymerized petroleum resins, alicyclic petroleum resins, coumarone-indene resins, and pure monomer-based resins; and condensation resins such as phenolic resins and xylene resins. Two or more tackifying resins may be used in combination. The content of the tackifying resin is preferably 20 parts by mass or more and 200 parts by mass or less, more preferably 30 parts by mass or more and 150 parts by mass or less, and particularly preferably 50 parts by mass or more and 100 parts by mass or less, per 100 parts by mass of the rubber component. When the tackifying agent is 20 parts by mass or more, a decrease in adhesive strength can be suppressed, and when it is 200 parts by mass or less, a decrease in removability when peeling the pressure-sensitive adhesive tape can be suppressed.

[0041] The rubber-based pressure-sensitive adhesive preferably contains an extender (filler) or process oil. Specific examples of extenders include calcium carbonate and zinc oxide. The amount of extender is preferably 30 parts by mass or more and 200 parts by mass per 100 parts by mass of the rubber component. The amount of process oil is preferably 5 to 50 parts by mass per 100 parts by mass of the rubber component. Furthermore, an antioxidant, a vulcanizing agent, a vulcanization accelerator, or the like may also be added within a range that does not impair the object of this embodiment.

[0042] The PSA may contain various additives known in the technical field of the present embodiment in addition to the above-mentioned fillers, etc. Examples of such additives include flame retardants, pigments, antioxidants, lubricants, etc., and the PSA may contain one or a combination of two or more of these.

[0043] (Bio-based Content) In the pressure-sensitive adhesive tape of this embodiment, each material can be selected so that the bio-based content is 30% or more. The bio-based content of a pressure-sensitive adhesive tape refers to the mass proportion of biomass-derived components in the total mass of the pressure-sensitive adhesive tape. The bio-based content of a pressure-sensitive adhesive tape can be determined according to ISO 16620-4 (Determination of Bio-based Mass Content). Specifically, the mass (A) of the total pressure-sensitive adhesive tape and the mass (B) of the biomass-derived components are calculated, and the value is calculated according to the following formula: Bio-based Content (%) = {mass (B) / mass (A)} × 100 The higher the bio-based content, the more effectively carbon dioxide emissions can be reduced. Note that when using a copolymer or a combination of multiple materials, if biomass-derived components are used in part and petroleum-derived components are used in the remainder, the bio-based content is calculated according to the proportion of biomass-derived components in each component.

[0044] The biomass-derived component used in the pressure-sensitive adhesive tape of the present embodiment refers to a renewable plant-derived organic resource, excluding materials that are depleted by mining, such as fossil resources. The biomass-derived component may be, for example, the renewable organic resource itself, or a material obtained by chemically or biologically modifying the organic resource or by synthesizing using the organic resource.

[0045] Biomass-derived components also release carbon dioxide when burned, but the amount of carbon dioxide released is the same as the amount absorbed from the atmosphere by plants through photosynthesis during their growth process, so it can be thought of as having no effect on the increase or decrease of carbon dioxide in the atmosphere. This concept is called carbon neutral, and by using biomass-derived components as constituent materials of adhesive tape, it is possible to reduce the amount of carbon dioxide.

[0046] (Method for Producing the Pressure-Sensitive Adhesive Tape) The method for producing the pressure-sensitive adhesive tape of the present embodiment is not particularly limited, and the tape can be produced using a known production method in this technical field. For example, the tape can be produced by the following method.

[0047] First, after weaving or knitting a base fabric, a laminate layer is formed on one side. The laminate layer can be formed by heat-melting a mixture containing polyethylene or the like, and then laminating it onto the surface of the base fabric by extrusion molding or the like. Next, a functional layer composition, which has been separately mixed and prepared, is applied to the side of the base fabric opposite the laminate layer to form a functional layer. Furthermore, a separately mixed and prepared pressure-sensitive adhesive composition is applied to the side of the base fabric on the same side as the laminate layer using various coating devices to form an adhesive layer. The functional layer and the adhesive layer may be formed simultaneously or sequentially, and the order is not important. Examples of coating devices include a calendar coater, roll coater, die coater, lip coater, Mayer bar coater, and gravure coater.

[0048] The manufactured adhesive tape is wound into a roll and cut to a predetermined width, and then the sides are protected with packaging material, such as polyethylene film, or stored in individual polyethylene film packages, so that the adhesive tape can be packed in a box while preventing the sides from coming into contact with other adhesive tapes or packaging materials.

[0049] (Effects of the Present Embodiment) According to the present embodiment, an adhesive tape having high functionality, conformability, and ease of hand tearing can be obtained.

[0050] The inventors discovered a configuration in which the surface of a base fabric is covered with a laminate layer, and the adhesive tape is constructed in the following order: a functional layer containing functional components, the base fabric, the laminate layer, and the adhesive layer. This configuration, in which the functional layer, the base fabric, and the laminate layer are formed in this order, does not prevent the functional particles and binder components of the functional layer from adhering to the base layer, such as the base fabric. Furthermore, since the laminate layer is provided on the opposite side of the base fabric from the functional layer, the base fabric is laminated, and the functional components of the functional layer do not penetrate between the fibers of the base fabric or pass through the adhesive layer to the adherend, so the functionality of the functional layer can be fully exerted. This results in an adhesive tape that combines high functionality, trackability, and ease of hand tearing.

[0051] The present invention will be described in more detail below with reference to examples, although it goes without saying that the present invention is not limited to these examples.

[0052] (Materials) 1. Functional layer Functional material (functional particles): Glow-in-the-dark pigment "GDK11025WP, LTI Corporation" Conductive filler "Pazet GK, Hakusui Tech Corporation" Pigment "GLOW ORANGE MSR, Matsui Shikiso Chemical Co., Ltd." Pigment "BLUE MSB, Matsui Shikiso Chemical Co., Ltd." Pigment "YELLOW MSGG, Matsui Shikiso Chemical Co., Ltd." Pigment "PINK MS5B, Matsui Shikiso Chemical Co., Ltd." Pigment "BLACK MP, Matsui Shikiso Chemical Co., Ltd." Pigment "GREEN MS5G, Matsui Shikiso Chemical Co., Ltd." Binder: Acrylic binder resin "Clear 240N, Matsui Shikiso Chemical Co., Ltd." (matt) Acrylic binder resin "Matsui Shikiso Chemical Co., Ltd." MSB-N" (glossy) Urethane binder resin "Matsui Shikiso Chemical Co., Ltd. Clear SWR-N" Crosslinking agent: Ethyleneimine crosslinking agent "Matsui Shikiso Chemical Co., Ltd. Fixer FE" Aziridine crosslinking agent "Matsui Shikiso Chemical Co., Ltd. Top Fixer N" Additive: Catalyst (thickener) "Matsui Shikiso Chemical Co., Ltd. #3000"

[0053] 2. Base fabric 80SS: warp density 45 threads / inch, 30 count rayon yarn, weft density 35 threads / inch, 30 count rayon yarn 70RP: warp density 40 threads / inch, 45 count rayon yarn, weft density 30 threads / inch, 125 denier polyester multifilament

[0054] 3. Laminate layer LDPE: Nippon Unicar Co., Ltd., product name "NUC8000" EEA: Dow Chemical Co., Ltd., product name "EA101"

[0055] <Substrate layer having base fabric and laminate layer> A 45 count rayon warp yarn and a 125 denier polyester multifilament weft yarn were used to weave a fabric with a warp density of 27 threads / inch and a weft density of 18 threads / inch. A mixed resin of low-density polyethylene and ethylene-ethyl acrylate copolymer (EEA) (composition ratio: LDPE:EEA = 70:30) was formed on one side of this woven fabric by extrusion lamination using a T-die at a processing temperature of 300°C, to produce a substrate with a total thickness of 170 μm.

[0056] <Functional layer> 25 parts by mass of the pigment shown in each example in the table and 5 parts by mass of the crosslinking agent shown in each example in the table were added to 100 parts by mass of an acrylic binder, and the layer was applied to a thickness of 20 μm on the surface opposite to the surface on which the polyethylene layer was formed.

[0057] <Preparation of Samples for Each Example and Comparative Example> A rubber-based adhesive was used. 100 parts by mass of natural rubber masticated in a kneader was mixed with 200 parts by mass of heavy calcium carbonate (manufactured by Maruo Calcium Co., Ltd.) having an average particle size of 12 μm as a filler, 25 parts by mass of process oil (trade name "Mobiltherm 610" manufactured by EMG Lubricants LLC) as a plasticizer, and 100 parts by mass of C5 resin (trade name "T-REZ RC100" manufactured by JXTG Nippon Oil & Energy, softening point: 95-105°C) as a tackifier. This adhesive was applied to the laminate layer using a calendar coater to a film thickness of 100 μm, to obtain adhesive tapes with a total thickness of 290 μm.

[0058] <Evaluation Methods> The properties of the pressure-sensitive adhesive tapes obtained as Examples 1 to 19 and Comparative Examples 1 to 5 were evaluated by the following methods. The results of the evaluations of each of the Examples and Comparative Examples are also shown in Tables 1 to 5.

[0059] [Thickness] The thickness was measured by a test method using a thickness gauge in accordance with JIS Z 0237 "Test methods for adhesive tapes and adhesive sheets."

[0060] <Functionality Evaluation> [60° Specular Gloss] Based on JIS Z8741, the adhesive tape was cut to 100 mm x 100 mm, the release paper was peeled off, and the end face of the tape was fixed with a clip and hung in a hot air dryer in an atmosphere of 120°C. After leaving it for 30 minutes and removing it, the 60° specular gloss of the functional layer was measured using a handy gloss meter (manufactured by Nippon Denshoku Industries Co., Ltd., device name PG-2M). The 60° specular gloss was evaluated according to the following two-stage scale. Evaluation criteria: ○: Less than 10 (matt coloring) Less than 5 (glossy coloring) ×: 10 or more (matt coloring) 5 or more (glossy coloring)

[0061] [Resin Adhesion] A 5 cm x 10 cm adhesive tape was manually attached to the binder resin layer of a 20 cm x 20 cm adhesive tape, and after peeling at high speed, the transfer of the binder resin layer to the adhesive tape surface was confirmed. The resin adhesion was evaluated using the following four-level scale. Evaluation criteria: ◎: No peeling; ○: Binder resin peeled in one location; △: Binder resin peeled in 2 to 10 locations; ×: Binder resin peeled in 11 or more locations.

[0062] [Luminescence test] After 20 minutes of irradiation with a fluorescent lamp (normal light source D65) at 300 lux, the tape was left in a dark place for 60 minutes. Thereafter, the visibility of the luminescence in the functional layer of the pressure-sensitive adhesive tape was evaluated according to the following two-stage scale. Evaluation criteria: ◯: Visible ×: No visibility

[0063] [Surface Resistivity] The surface resistivity was measured using a surface resistance measuring device (company name, product name) in accordance with 5.13 resistivity of JIS K 6911 (general testing method for thermosetting plastics). The measurement conditions are as follows. The surface resistivity was evaluated according to the following two-level criteria: Test piece: 100 mm x 100 mm, voltage: 100 V Evaluation criteria: ◯: Surface resistivity is 1.0 x 10 １０ Less than ×: Surface resistivity is 1.0 × 10 １０ End

[0064] <Evaluation of Hand Tearability> The adhesive tapes (width: 48 mm) obtained in Examples and Comparative Examples were cut in the width direction (TD) with bare hands (a total of five times), and the hand tearability (sensory test) of the adhesive tapes was evaluated according to the following evaluation criteria: Evaluation criteria ○: Could be easily cut with bare hands all five times. △: Could be easily cut with bare hands four times. ×: Could not be easily cut with bare hands more than three times.

[0065] <Evaluation of Conformability> A 48 mm wide test piece (adhesive tape) was attached to the surface of a rectangular parallelepiped support covered with a synthetic resin material sheet made of soft polyvinyl chloride (Nihon Daikogyo Co., Ltd., PVC curing sheet 003085) so that it was wrapped around half the circumference of the rectangular parallelepiped, and the peeling state (lifting) of the test piece was visually confirmed under stationary conditions, and the conformability was evaluated according to the following evaluation criteria. Evaluation criteria: ○: The test piece (adhesive tape) was not lifted at all and was adhered to the surface of the support. △: The test piece (adhesive tape) was partially lifted at the edge. ×: The test piece (adhesive tape) was lifted overall and not adhered to the surface of the support.

[0066] [Overall Evaluation] Based on the results of four types of evaluation, namely, resin adhesion, functionality evaluation (60° glossiness, phosphorescent test, surface resistivity), hand tearability evaluation, and followability evaluation, the overall evaluation of the pressure-sensitive adhesive tape was evaluated according to the following criteria. The evaluation criteria are as follows. Evaluation criteria: ◎: The result of resin adhesion was "◎", and the results of functionality evaluation, hand tearability evaluation, and followability evaluation were all "〇". 〇: The results of resin adhesion, functionality evaluation, hand tearability evaluation, and followability evaluation were all "〇". △: The results of resin adhesion, functionality evaluation, hand tearability evaluation, and followability evaluation were one or less "△" and no "×". ×: The results of resin adhesion, functionality evaluation, hand tearability evaluation, and followability evaluation were two or more "△" or one or more "×".

[0067] Tables 1 to 3 show the results of Examples 1 to 14 and Comparative Examples 1 to 3, in which pigments were used as functional particles.

[0068]

[0069]

[0070]

[0071] As shown in the table, all of Examples 1 to 14 were evaluated as 0 or above in gloss, hand-tearability, and followability. They were also evaluated as fair or above in resin adhesion. Furthermore, Examples 5 to 14 were evaluated as 0 or above in all evaluations, with Example 14 being particularly excellent. In contrast, among Comparative Examples 1 to 3, some were evaluated as 0 in gloss, and as fair or above in hand-tearability and followability, but none were evaluated as highly rated in all cases.

[0072] Table 4 shows the results of Examples 15 to 17 and Comparative Example 4, which used a phosphorescent material as the functional component.

[0073]

[0074] As shown in the table, all of Examples 15 to 17 were evaluated as 0 or higher in the luminous test, hand-tearability, and followability. They were also evaluated as fair or higher in resin adhesion. Furthermore, Examples 15 and 16 were evaluated as 0 or higher in all evaluations. In contrast, Comparative Example 4 was evaluated as 0 in resin adhesion, hand-tearability, and followability, but did not receive a high evaluation in the luminous test.

[0075] Table 5 shows the results for Examples 18 to 19 and Comparative Example 5, which used conductive particles as the functional component.

[0076] As shown in the table, Examples 18 and 19 were all rated as good or better in terms of resin adhesion, hand tearability, and followability, and the surface resistance was also 1.0 × 10 １０ In contrast, Comparative Example 5 did not receive a high evaluation for the surface resistance value.

[0077] According to this embodiment, an adhesive tape having high functionality, conformability, and ease of hand tearing can be obtained.

[0078] REFERENCE SIGNS LIST 1 adhesive tape 10 functional layer 11 base fabric 12 laminate layer 13 adhesive layer 14 functional particles 15 binder resin

Claims

1. An adhesive tape having, in order, a functional layer, a base layer, and an adhesive layer, the base layer comprising: a base fabric; and a laminate layer provided on the adhesive layer side of the base fabric.

2. The pressure-sensitive adhesive tape according to claim 1, wherein the functional layer contains a binder resin and functional particles, and the binder resin includes any one of a (meth)acrylic binder resin, a urethane binder resin, an epoxy binder resin, and a polyester binder resin.

3. The adhesive tape according to claim 1 or 2, wherein the base fabric is a woven fabric or a knitted fabric, and the laminate layer contains a polyethylene resin.

4. The adhesive tape according to claim 1 or 2, wherein the functional layer has one or more functions selected from anti-reflection properties, anti-glare properties, anti-static properties, anti-fouling properties, reinforcement properties, ultraviolet absorption properties, visible light absorption properties, electrical conductivity, insulation properties, anti-static properties, gas barrier properties, deodorizing properties, drip resistance, slip resistance, abrasion resistance, electromagnetic wave shielding properties, printability, fluorescence properties, holographic properties, and colorability.

5. The adhesive tape according to claim 1 or 2, wherein the functional layer has one or more functions selected from the group consisting of fluorescence, holographic properties, and colorability.

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