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WO2018168750A1 - Bande auto-adhésive double face - Google Patents

Bande auto-adhésive double face Download PDF

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Publication number
WO2018168750A1
WO2018168750A1 PCT/JP2018/009458 JP2018009458W WO2018168750A1 WO 2018168750 A1 WO2018168750 A1 WO 2018168750A1 JP 2018009458 W JP2018009458 W JP 2018009458W WO 2018168750 A1 WO2018168750 A1 WO 2018168750A1
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WO
WIPO (PCT)
Prior art keywords
double
adhesive tape
sensitive adhesive
sided
pressure
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2018/009458
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English (en)
Japanese (ja)
Inventor
友也 川本
勇樹 岩井
智 土居
真理子 野田
徳之 内田
繁季 松木
彩葉 小栗
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sekisui Chemical Co Ltd
Original Assignee
Sekisui Chemical Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sekisui Chemical Co Ltd filed Critical Sekisui Chemical Co Ltd
Priority to CN201880006325.7A priority Critical patent/CN110177848B/zh
Priority to KR1020197015189A priority patent/KR102645230B1/ko
Publication of WO2018168750A1 publication Critical patent/WO2018168750A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/18—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer of foamed material
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J201/00—Adhesives based on unspecified macromolecular compounds
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/20—Adhesives in the form of films or foils characterised by their carriers
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/20—Adhesives in the form of films or foils characterised by their carriers
    • C09J7/22—Plastics; Metallised plastics
    • C09J7/26—Porous or cellular plastics
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2301/00—Additional features of adhesives in the form of films or foils
    • C09J2301/10—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet
    • C09J2301/12—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers
    • C09J2301/124—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers the adhesive layer being present on both sides of the carrier, e.g. double-sided adhesive tape
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2301/00—Additional features of adhesives in the form of films or foils
    • C09J2301/30—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
    • C09J2301/312—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier parameters being the characterizing feature

Definitions

  • the present invention relates to a double-sided pressure-sensitive adhesive tape.
  • Double-sided adhesive tape is used for assembly in portable electronic devices such as mobile phones and personal digital assistants (PDAs) (for example, Patent Documents 1 and 2).
  • double-sided adhesive tape is also used for fixing an in-vehicle electronic device component such as an in-vehicle panel to a vehicle body.
  • Examples of a method for fixing a portion to which a restoring force or a repulsive force is applied include a method of fixing with a conventional liquid or paste adhesive.
  • fixing with an adhesive increases the tact time, and it is difficult to cure the adhesive in a state where the parts are deformed.
  • An object of this invention is to provide the double-sided adhesive tape excellent in the resilience-proof power.
  • the present invention is a double-sided pressure-sensitive adhesive tape having pressure-sensitive adhesive layers on both sides of a base material, wherein the force applied to the double-sided pressure-sensitive adhesive tape is 55 N or less at an elongation of 0.5 mm as measured by the following tensile test. It is. (Tensile test) Using a double-sided adhesive tape cut to 25 mm ⁇ 25 mm, a polycarbonate plate having a thickness of 2 mm and a jig made of stainless steel having a thickness of 2 mm are bonded together. After fixing the polycarbonate plate, the stainless steel jig is pulled in the direction perpendicular to the surface at a rate of 0.1 mm / min, and the force applied to the double-sided adhesive tape is measured.
  • the present invention is described in detail below.
  • the present inventors have adjusted the force applied to the double-sided pressure-sensitive adhesive tape when measured by a specific tensile test within a specific range, thereby restoring the resilience and repulsion.
  • the present inventors have found that the adhesive reliability of the double-sided pressure-sensitive adhesive tape in a state where force is applied can be improved, and have completed the present invention.
  • the double-sided pressure-sensitive adhesive tape of the present invention has pressure-sensitive adhesive layers on both surfaces of the substrate.
  • the base material is preferably a foam, and when the base is a foam, it may have an open cell structure or a closed cell structure, but preferably has an open cell structure.
  • the closed cell structure is a cell structure in which adjacent foam cells are not bonded to each other and exist independently.
  • the open cell structure is a cell structure in which adjacent foam cells are bonded to form a continuous cell. As long as the open cell structure is not impaired, independent foam cells may exist in the open cell structure.
  • Examples of a method for determining whether or not the substrate has an open cell structure include the following methods.
  • the substrate is cut into 50 mm squares, immersed in liquid nitrogen for 1 minute, and then cut along a plane parallel to the thickness direction with a razor blade.
  • a digital microscope for example, “VHX-500” manufactured by Keyence Corporation
  • an enlarged photograph of the obtained cut surface is taken at a magnification of 100 to 500 times, and adjacent foam cells are joined together If multiple are confirmed, it can be judged that the said base material has an open-cell structure.
  • the substrate may have a single layer structure or a multilayer structure.
  • the said base material is not specifically limited, For example, foams, such as a polyurethane foam, polyolefin foam, an acrylic foam, and rubber-type resin are mentioned. Among them, since the open cell structure is easy to be formed and the force applied to the double-sided pressure-sensitive adhesive tape when measured by a specific tensile test described later tends to be within a specific range, the substrate is made of polyurethane foam or rubber-based resin. It is preferable that it is a polyurethane foam.
  • polyurethane foam examples include a polyurethane foam produced by heat-curing a urethane resin composition containing polyisocyanate and polyol.
  • the said polyisocyanate is not specifically limited, The aromatic polyisocyanate or aliphatic polyisocyanate used for a general polyurethane foam is mentioned.
  • 4,4′-diphenylmethane diisocyanate (MDI), tolylene diisocyanate, 1,6-hexamethylene diisocyanate, 1,5-naphthalene diisocyanate, paraphenylene diisocyanate, 2,2,4-trimethylhexamethylene diisocyanate 2,4,4-trimethylhexamethylene diisocyanate, 4,4′-dicyclohexylmethane diisocyanate, m-xylene diisocyanate, hexamethylene diisocyanate, hydrogenated MDI, isophorone diisocyanate and the like.
  • said polyisocyanate the urethane prepolymer which has an isocyanate group is mentioned, for example. These polyisocyanates may be used alone or in combination of two or more.
  • the said polyol is not specifically limited,
  • the polyol used for a general polyurethane foam is mentioned.
  • Specific examples include polyether polyol, polyester polyol, polyether ester polyol, and the like.
  • the polyol include short-chain diols such as trifunctional polyether polyols ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol, 1,4-butanediol, glycerin, and trimethylolpropane. These polyols may be used alone or in combination of two or more.
  • the weight average molecular weight of the polyol is not particularly limited, but a preferable lower limit is 2000 and a preferable upper limit is 12000.
  • a preferable lower limit is 2000
  • a preferable upper limit is 12000.
  • the flexibility of the base material can be prevented from being excessively lowered, and the force applied to the double-sided adhesive tape when measured by a specific tensile test described later is specified. It tends to be within the range.
  • the weight average molecular weight of the polyol is 12000 or less, the base material can be prevented from being too soft, and the force applied to the double-sided pressure-sensitive adhesive tape when measured by a specific tensile test described later is within a specific range. It becomes easy.
  • the isocyanate index of the polyisocyanate in the urethane resin composition is not particularly limited, but a preferred lower limit is 70 and a preferred upper limit is 120.
  • the isocyanate index is an index related to an isocyanate equivalent in the reaction between an isocyanate and an active hydrogen-containing compound.
  • the isocyanate index is less than 100, the reactive group such as a hydroxyl group is excessive from the isocyanate group, and when the isocyanate index exceeds 100, the isocyanate group is excessive from the reactive group such as a hydroxyl group.
  • the said isocyanate index is 70 or more, the bridge
  • the said isocyanate index is 120 or less, it can suppress that the bridge
  • the stress relaxation property of the base material is increased, the force applied to the double-sided adhesive tape when measured by a specific tensile test described later tends to be within an appropriate range, and the double-sided adhesive tape is peeled off. More suppressed.
  • the urethane resin composition may contain a catalyst as necessary.
  • the catalyst include organic tin compounds such as stannous octoate, dibutyltin diacetate and dibutyltin dilaurate, organic zinc compounds such as zinc octylate, organic nickel compounds such as nickel acetylacetoate and nickel diacetylacetoate, iron acetyl Examples thereof include organic iron compounds such as acetoate.
  • alkali metal such as sodium acetate or alkaline earth metal alkoxide
  • metal catalyst such as phenoxide, triethylamine, triethylenediamine, N-methylmorpholine dimethylaminomethylphenol, imidazole, 1,8-diazabicyclo [5.4.0]
  • metal catalyst such as phenoxide, triethylamine, triethylenediamine, N-methylmorpholine dimethylaminomethylphenol, imidazole, 1,8-diazabicyclo [5.4.0]
  • tertiary amine catalysts such as undecene, organic acid salts and the like. Of these, organotin compounds are preferred. These catalysts may be used independently and may use 2 or more types together.
  • the addition amount of the catalyst is not particularly limited, but a preferable lower limit with respect to 100 parts by weight of the polyol is 0.05 parts by weight, a preferable upper limit is 5.0 parts by weight, and a more preferable upper limit is 4.0 parts by weight.
  • the urethane resin composition may contain a foaming agent as necessary.
  • the foaming agent include foaming agents used for general polyurethane foams. Specific examples include water, pentane, cyclopentane, hexane, cyclohexane, dichloromethane, carbon dioxide gas and the like.
  • the addition amount of the foaming agent is not particularly limited, and is an appropriate amount. When the foaming agent is water, the amount is usually about 0.1 to 3 parts by weight with respect to 100 parts by weight of the polyol. is there.
  • the urethane resin composition may contain a foam stabilizer as necessary.
  • foam stabilizer include silicone foam stabilizers such as dimethylsiloxane, polyether dimethylsiloxane, and phenylmethylsiloxane. Of these, polyether dimethylsiloxane is preferable, and among the polyether dimethylsiloxanes, a block copolymer of dimethylpolysiloxane and polyether is more preferable. These foam stabilizers may be used alone or in combination of two or more.
  • the addition amount of the foam stabilizer is not particularly limited, the preferable lower limit with respect to 100 parts by weight of the polyol is 0.2 parts by weight, the preferable upper limit is 7 parts by weight, and the more preferable lower limit is 0.4 parts by weight. Is 5 parts by weight.
  • the urethane resin composition may contain additives generally used in the production of polyurethane foams such as an ultraviolet absorber, an antioxidant, an organic filler, an inorganic filler, and a colorant, if necessary. Good.
  • a urethane resin composition liquid that is foamed by mechanically mixing air, nitrogen, or the like is applied to the surface of a release liner or resin film, and the applied urethane resin composition is applied.
  • the method mechanical floss method etc. which manufacture a foam by heat-hardening is mentioned.
  • the method chemical foaming method etc. which make the said polyisocyanate react with the raw material for forming the said polyurethane foam and generate
  • the mechanical floss method is preferable.
  • the polyurethane foam obtained by the mechanical froth method tends to have a higher density and the cell structure tends to be fine and uniform than the polyurethane foam obtained by the chemical foaming method.
  • the rubber resin examples include natural rubber, isoprene rubber, styrene butadiene rubber, butyl rubber, butadiene rubber, EPDM, nitrile rubber, chloroprene rubber, silicone rubber, block copolymers such as SEBS and SEPS, and the like.
  • the density of the base material is not particularly limited, preferable lower limit is 50 kg / m 3, a preferred upper limit is 800 kg / m 3. If the density of the base material is 50 kg / m 3 or more, the strength of the base material and the double-sided pressure-sensitive adhesive tape is sufficiently high, and the dust resistance and waterproofness of the base material and the double-sided pressure-sensitive adhesive tape are easily secured. If the density of the base material is 800 kg / m 3 or less, the force applied to the double-sided pressure-sensitive adhesive tape when measured by a specific tensile test described later tends to be within a specific range, and a restoring force or a repulsive force is applied. Adhesion reliability of double-sided adhesive tape is improved.
  • a more preferred lower limit of the substrate is 100 kg / m 3, more preferred upper limit is 700 kg / m 3, still more preferred lower limit 150 kg / m 3, still more preferred upper limit is 500 kg / m 3.
  • the density can be measured using an electronic hydrometer (for example, “ED120T” manufactured by Mirage) in accordance with JIS K 6401 (when using polyurethane) and JIS K 6767 (when using polyethylene).
  • the 25% compressive strength of the substrate is not particularly limited, but a preferred lower limit is 1 kPa and a preferred upper limit is 50 kPa. If the 25% compressive strength of the base material is 1 kPa or more, the strength of the base material and the double-sided pressure-sensitive adhesive tape is sufficiently high, and the double-sided pressure-sensitive adhesive tape is difficult to peel off even if a restoring force or a repulsive force is applied. If the 25% compressive strength of the substrate is 50 kPa or less, the pressure bonding when the substrate is taped becomes sufficient, and the double-sided adhesive tape is difficult to peel off.
  • the more preferable lower limit of the 25% compressive strength of the substrate is 3 kPa
  • the more preferable upper limit is 45 kPa
  • the still more preferable lower limit is 5 kPa
  • the still more preferable upper limit is 40 kPa.
  • 25% compressive strength can be calculated
  • the glass transition point of the substrate is not particularly limited, but is preferably greater than 0 ° C. If the glass transition point is higher than 0 ° C., the base material can have appropriate flexibility, so that the stress relaxation property of the base material can be enhanced.
  • the base material with a glass transition point larger than 0 degreeC the polyurethane foam mentioned above etc. are mentioned, for example.
  • a more preferable lower limit of the glass transition point is 5 ° C., and a more preferable lower limit is 10 ° C.
  • the upper limit of the glass transition point of the substrate is not particularly limited, but if it is too high, the flexibility is impaired, so the preferable upper limit is 25 ° C., and the more preferable upper limit is 20 ° C.
  • the glass transition point was measured using a viscoelasticity measuring apparatus (for example, “Rheometrics Dynamic Analyze RDA-700” manufactured by Rheometrics), a measurement temperature of ⁇ 30 to 100 ° C., a temperature increase rate of 3 ° C./min, and a frequency of 1 Hz.
  • a viscoelasticity measuring apparatus for example, “Rheometrics Dynamic Analyze RDA-700” manufactured by Rheometrics
  • a measurement temperature of ⁇ 30 to 100 ° C.
  • a temperature increase rate of 3 ° C./min
  • a frequency of 1 Hz can be determined under the following conditions
  • the thickness of the said base material is not specifically limited, A preferable minimum is 0.3 mm and a preferable upper limit is 2.9 mm. If the thickness of the base material is 0.3 mm or more, the double-sided pressure-sensitive adhesive tape is difficult to peel off even if a restoring force or a repulsive force is applied. If the thickness of the base material is 2.9 mm or less, the double-sided pressure-sensitive adhesive tape can realize sufficient adhesion and fixation. The minimum with more preferable thickness of the said base material is 0.4 mm, and a more preferable upper limit is 2.5 mm. The thickness of the substrate can be measured using a dial thickness meter (for example, “ABS Digimatic Indicator” manufactured by Mitutoyo).
  • the double-sided pressure-sensitive adhesive tape of the present invention may further have a resin sheet integrated with the substrate.
  • the resin sheet By using the resin sheet, it is possible to prevent the base material from stretching and breaking at the time of handling, and reworkability can be imparted to the double-sided pressure-sensitive adhesive tape.
  • the resin constituting the resin sheet is not particularly limited.
  • polyester resin such as polyethylene terephthalate, polyethylene resin, polypropylene resin, polyvinyl chloride, epoxy resin, silicone resin, phenol resin, polyimide, polyester, polycarbonate, An acrylic resin etc. are mentioned.
  • polyethylene resins, polypropylene resins, and polyester resins are preferred because of their excellent flexibility.
  • polyethylene terephthalate is preferable.
  • the thickness of the said resin sheet is not specifically limited, A preferable minimum is 10 micrometers and a preferable upper limit is 100 micrometers. When the thickness of the resin sheet is 10 ⁇ m or more, the resin sheet is hardly broken even when the resin sheet is pulled. If the thickness of the said resin sheet is 100 micrometers or less, the fall of the followable
  • the resin sheet may be colored.
  • coloring the resin sheet By coloring the resin sheet, light-shielding properties can be imparted to the double-sided pressure-sensitive adhesive tape.
  • the method for coloring the resin sheet is not particularly limited. For example, a method of kneading particles such as carbon black or titanium oxide or fine bubbles in the resin constituting the resin sheet, or applying ink to the surface of the resin sheet. Methods and the like.
  • the double-sided pressure-sensitive adhesive tape of the present invention has pressure-sensitive adhesive layers on both surfaces of the substrate.
  • the pressure-sensitive adhesive layers formed on both surfaces of the substrate may have the same composition or different compositions.
  • the pressure-sensitive adhesive layer is not particularly limited, and examples thereof include an acrylic pressure-sensitive adhesive layer, a rubber-based pressure-sensitive adhesive layer, a urethane pressure-sensitive adhesive layer, and a silicone-based pressure-sensitive adhesive layer.
  • an acrylic pressure-sensitive adhesive layer is preferable because it is relatively stable to light, heat, moisture, and the like, and adherend selectivity is low.
  • the acrylic copolymer constituting the acrylic pressure-sensitive adhesive layer can be obtained by copolymerizing a monomer mixture.
  • the monomer mixture may be radically reacted in the presence of a polymerization initiator.
  • a method of radical reaction of the monomer mixture that is, a polymerization method
  • examples thereof include solution polymerization (boiling point polymerization or constant temperature polymerization), emulsion polymerization, suspension polymerization, bulk polymerization and the like.
  • Examples of the reaction method when the monomer mixture is subjected to radical reaction include living radical polymerization and free radical polymerization. Of these, living radical polymerization is preferred. That is, the acrylic copolymer is preferably an acrylic copolymer obtained by living radical polymerization.
  • Living radical polymerization is polymerization in which molecular chains grow without the polymerization reaction being hindered by side reactions such as termination reactions or chain transfer reactions.
  • the reaction proceeds without the growth terminal radicals being deactivated and without generating new radical species during the reaction.
  • the middle of the reaction all the molecular chains are polymerized while reacting with the monomer uniformly, and the composition of all the molecular chains approaches uniform. Therefore, according to living radical polymerization, a copolymer having a more uniform molecular weight and composition than that of free radical polymerization can be obtained, and generation of low molecular weight components and the like can be suppressed. Increases cohesion.
  • free radical polymerization radical species are continuously generated during the reaction and added to the monomer, and the polymerization proceeds. Therefore, in free radical polymerization, a molecular chain in which a growing terminal radical is deactivated during the reaction or a molecular chain grown by a radical species newly generated during the reaction is generated. Therefore, according to free radical polymerization, the composition of the copolymer becomes non-uniform compared to living radical polymerization, and a relatively low molecular weight copolymer is included. The cohesive force tends to be low.
  • an acrylic copolymer obtained by free radical polymerization is used as the acrylic copolymer. May be.
  • the force applied to the double-sided pressure-sensitive adhesive tape when measured by a tensile test can be adjusted using the acrylic copolymer obtained by free radical polymerization. .
  • the acrylic copolymer obtained by the living radical polymerization is an acrylic copolymer obtained by copolymerizing a monomer mixture containing 2-ethylhexyl acrylate from the viewpoint of improving the wettability of the acrylic pressure-sensitive adhesive layer.
  • the preferred content of 2-ethylhexyl acrylate in the total monomer mixture is 80 to 98% by weight. If the content of 2-ethylhexyl acrylate is 80% by weight or more, the glass transition point of the acrylic copolymer is lowered, and the wettability of the acrylic pressure-sensitive adhesive layer is increased.
  • the acrylic pressure-sensitive adhesive layer has an appropriate hardness and sufficient cohesive strength.
  • a more preferable lower limit of the content of 2-ethylhexyl acrylate is 90% by weight, and a more preferable upper limit is 97% by weight.
  • the acrylic copolymer obtained by free radical polymerization is preferably an acrylic copolymer obtained by copolymerizing a monomer mixture containing butyl acrylate and 2-ethylhexyl acrylate.
  • the preferred content of butyl acrylate in the total monomer mixture is 40 to 80% by weight.
  • the acrylic pressure-sensitive adhesive layer has an appropriate hardness and sufficient cohesive strength, and the double-sided pressure-sensitive adhesive tape has high adhesive strength.
  • content of butyl acrylate is 80 weight% or less, it can suppress that the said acrylic adhesive layer becomes hard and tackiness and wettability (adhesive strength of an interface with a to-be-adhered body) fall.
  • the preferred content of 2-ethylhexyl acrylate in the total monomer mixture is 10 to 40% by weight. When the content of 2-ethylhexyl acrylate is 10% by weight or more, the adhesive strength of the acrylic pressure-sensitive adhesive layer is sufficient. When the content of 2-ethylhexyl acrylate is 40% by weight or less, it is possible to prevent the acrylic pressure-sensitive adhesive layer from becoming too soft and reducing the cohesive force.
  • the monomer mixture may contain other copolymerizable monomers other than butyl acrylate and 2-ethylhexyl acrylate as necessary.
  • examples of other polymerizable monomers that can be copolymerized include, for example, carbon number of alkyl groups such as methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, and isopropyl (meth) acrylate. 1 to 3 (meth) acrylic acid alkyl esters.
  • examples include (meth) acrylic acid alkyl esters having 13 to 18 carbon atoms in the alkyl group such as tridecyl methacrylate and stearyl (meth) acrylate.
  • hydroxyalkyl (meth) acrylate glycerin dimethacrylate, glycidyl (meth) acrylate, 2-methacryloyloxyethyl isocyanate, (meth) acrylic acid, itaconic acid, maleic anhydride, crotonic acid, maleic acid, fumaric acid, etc.
  • functional monomers are mentioned.
  • the said polymerization initiator is not specifically limited, For example, an organic peroxide, an azo compound, an organic tellurium polymerization initiator etc. are mentioned.
  • an organic tellurium polymerization initiator is preferable as the polymerization initiator for initiating living radical polymerization.
  • a functional monomer having a polar functional group such as a hydroxyl group or a carboxyl group is not protected, and a copolymer having a uniform molecular weight and composition is polymerized with the same initiator. A polymer can be obtained.
  • organic peroxide examples include 1,1-bis (t-hexylperoxy) -3,3,5-trimethylcyclohexane, t-hexylperoxypivalate, t-butylperoxypivalate, 2,5 -Dimethyl-2,5-bis (2-ethylhexanoylperoxy) hexane, t-hexylperoxy-2-ethylhexanoate, t-butylperoxy-2-ethylhexanoate, t-butylperoxy Examples include isobutyrate, t-butylperoxy-3,5,5-trimethylhexanoate, and t-butylperoxylaurate.
  • the azo compound is not particularly limited as long as it is generally used for radical polymerization.
  • 2,2′-azobis isobutyronitrile
  • 2,2 ′ -Azobis (4-methoxy-2,4-dimethylvaleronitrile)
  • 1,1-azobis 1,1-azobis (cyclohexane-1-carbonitrile), 1-[(1-cyano-1-methylethyl) azo] formamide
  • 4,4 '-Azobis (4-cyanovaleric acid), dimethyl-2,2'-azobis (2-methylpropionate), dimethyl-1,1'-azobis (1-cyclohexanecarboxylate)
  • the organic tellurium polymerization initiator is not particularly limited as long as it is generally used for living radical polymerization, and examples thereof include organic tellurium compounds and organic telluride compounds.
  • examples of the organic tellurium compounds include (methylterranyl-methyl) benzene, (1-methylterranyl-ethyl) benzene, (2-methylterranyl-propyl) benzene, 1-chloro-4- (methylterranyl-methyl) benzene, 1-hydroxy- 4- (methylterranyl-methyl) benzene, 1-methoxy-4- (methylterranyl-methyl) benzene, 1-amino-4- (methylterranyl-methyl) benzene, 1-nitro-4- (methylterranyl-methyl) benzene, 1- Cyano-4- (methylterranyl-methyl) benzene, 1-methylcarbonyl-4- (methylterranyl-methyl) benzene, 1-phenylcarbonyl-4- (methylterran
  • the methyl terranyl group in these organic tellurium compounds may be an ethyl terranyl group, n-propyl terranyl group, isopropyl terranyl group, n-butyl terranyl group, isobutyl terranyl group, t-butyl terranyl group, phenyl terranyl group, etc.
  • These organic tellurium compounds may be used alone or in combination of two or more.
  • organic telluride compound examples include dimethyl ditelluride, diethyl ditelluride, di-n-propyl ditelluride, diisopropyl ditelluride, dicyclopropyl ditelluride, di-n-butyl ditelluride, di-sec-butyl ditelluride.
  • These organic telluride compounds may be used alone or in combination of two or more. Of these, dimethyl ditelluride, diethyl ditelluride, di-n-propyl ditelluride, di-n-butyl ditelluride and diphenyl ditelluride are preferable.
  • an azo compound may be used as a polymerization initiator for the purpose of accelerating the polymerization rate.
  • a dispersion stabilizer may be used when the monomer mixture undergoes a radical reaction.
  • examples of the dispersion stabilizer include polyvinyl pyrrolidone, polyvinyl alcohol, methyl cellulose, ethyl cellulose, poly (meth) acrylic acid, poly (meth) acrylic acid ester, and polyethylene glycol.
  • the polymerization solvent is not particularly limited.
  • nonpolar solvents such as hexane, cyclohexane, octane, toluene, xylene, and high polarity such as water, methanol, ethanol, propanol, butanol, acetone, methyl ethyl ketone, methyl isobutyl ketone, tetrahydrofuran, dioxane, N, N-dimethylformamide A solvent can be used.
  • These polymerization solvents may be used alone or in combination of two or more.
  • the polymerization temperature is preferably 0 to 110 ° C. from the viewpoint of the polymerization rate.
  • the weight average molecular weight (Mw) of the said acrylic copolymer As for the weight average molecular weight (Mw) of the said acrylic copolymer, a preferable minimum is 400,000 and a preferable upper limit is 1.5 million. When the weight average molecular weight is 400,000 or more, the acrylic pressure-sensitive adhesive layer has an appropriate hardness and sufficient cohesive force, and the double-sided pressure-sensitive adhesive tape has high adhesive force. When the weight average molecular weight is 1.5 million or less, the adhesive force of the acrylic pressure-sensitive adhesive layer is sufficient. A more preferable lower limit of the weight average molecular weight is 500,000, and a more preferable upper limit is 1,400,000. In order to adjust the weight average molecular weight within the above range, polymerization conditions such as a polymerization initiator and a polymerization temperature may be adjusted.
  • the ratio of the weight average molecular weight (Mw) to the number average molecular weight (Mn) of the acrylic copolymer is preferably 10.0. If Mw / Mn is 10.0 or less, the content of low molecular weight components and the like is reduced, so the cohesive force and wettability (adhesive strength of the interface with the adherend) of the acrylic pressure-sensitive adhesive layer is increased, Adhesive strength increases. A more preferable upper limit of Mw / Mn is 3.0. In order to adjust Mw / Mn within the above range, polymerization conditions such as a polymerization initiator and a polymerization temperature may be adjusted.
  • a number average molecular weight (Mn) and a weight average molecular weight (Mw) are the weight average molecular weights of standard polystyrene conversion by GPC (Gel Permeation Chromatography: gel permeation chromatography).
  • GPC Gel Permeation Chromatography: gel permeation chromatography
  • 2690 Separations Model manufactured by Waters can be used.
  • the pressure-sensitive adhesive layer may contain a tackifier resin.
  • tackifier resins include rosin ester resins, hydrogenated rosin resins, terpene resins, terpene phenol resins, coumarone indene resins, alicyclic saturated hydrocarbon resins, C5 petroleum resins, and C9 resins. Examples include petroleum resins and C5-C9 copolymer petroleum resins. These tackifying resins may be used alone or in combination of two or more.
  • the content of the tackifying resin is not particularly limited, but a preferable lower limit with respect to 100 parts by weight of a resin (for example, an acrylic copolymer) as a main component of the pressure-sensitive adhesive layer is 10 parts by weight, and a preferable upper limit is 60 parts by weight. . If content of the said tackifying resin is 10 weight part or more, the adhesive force of the said adhesive layer will become high. If the content of the tackifying resin is 60 parts by weight or less, the pressure-sensitive adhesive layer is too hard to suppress a decrease in adhesive strength, tackiness or wettability (adhesive strength at the interface with the adherend). can do.
  • a resin for example, an acrylic copolymer
  • a cross-linking structure is formed between main chains of a resin (for example, the acrylic copolymer, the tackifying resin, etc.) constituting the pressure-sensitive adhesive layer by adding a cross-linking agent.
  • a cross-linking agent for example, an isocyanate type crosslinking agent, an aziridine type crosslinking agent, an epoxy-type crosslinking agent, a metal chelate type crosslinking agent etc. are mentioned. Of these, isocyanate-based crosslinking agents are preferred.
  • an isocyanate-based crosslinking agent By adding an isocyanate-based crosslinking agent to the pressure-sensitive adhesive layer, an alcohol in a resin (for example, the acrylic copolymer, the tackifying resin, etc.) constituting the pressure-sensitive adhesive layer and the isocyanate group of the isocyanate-based crosslinking agent
  • a resin for example, the acrylic copolymer, the tackifying resin, etc.
  • the reactive hydroxyl group reacts to loosen the pressure-sensitive adhesive layer. Therefore, the pressure-sensitive adhesive layer can disperse the intermittently applied peeling stress, and the adhesive strength of the double-sided pressure-sensitive adhesive tape is further improved.
  • the addition amount of the cross-linking agent is preferably 0.01 to 10 parts by weight, preferably 0.1 to 7 parts by weight with respect to 100 parts by weight of the resin (for example, the acrylic copolymer) as a main component of the pressure-sensitive adhesive layer. Is more preferable.
  • the pressure-sensitive adhesive layer may contain a silane coupling agent for the purpose of improving the adhesive strength.
  • the silane coupling agent is not particularly limited, and examples thereof include epoxy silanes, acrylic silanes, methacryl silanes, amino silanes, and isocyanate silanes.
  • the pressure-sensitive adhesive layer may contain a colorant for the purpose of imparting light shielding properties.
  • the colorant is not particularly limited, and examples thereof include carbon black, aniline black, and titanium oxide. Among these, carbon black is preferable because it is relatively inexpensive and chemically stable.
  • the degree of crosslinking of the pressure-sensitive adhesive layer was determined by collecting W 1 (g) of the pressure-sensitive adhesive layer, immersing this pressure-sensitive adhesive layer in ethyl acetate at 23 ° C. for 24 hours, and filtering the insoluble matter with a 200-mesh wire mesh. Then, the residue on the wire mesh is vacuum-dried, and the weight W 2 (g) of the dried residue is measured, and calculated by the following formula (1).
  • Crosslinking degree (% by weight) 100 ⁇ W 2 / W 1 (1)
  • the pressure-sensitive adhesive layer preferably has a displacement of 210 ⁇ m or less at 80 ° C. measured by a cohesive force test. If the amount of displacement is 210 ⁇ m or less, the pressure-sensitive adhesive layer has an appropriate hardness, sufficient cohesive force, and high adhesive force. A more preferable upper limit of the displacement is 150 ⁇ m.
  • the lower limit of the amount of displacement is not particularly limited, but if it is too low, the pressure-sensitive adhesive layer becomes hard and wettability is lowered, so the preferred lower limit is 50 ⁇ m, and the more preferred lower limit is 100 ⁇ m.
  • the cohesive strength test is performed as follows. In FIG. 1, the schematic diagram which shows the cohesion force test of an adhesive layer is shown.
  • a double-sided pressure-sensitive adhesive tape having a pressure-sensitive adhesive layer formed on both sides of a base material is prepared. Then, as shown in FIG. 1, the two SUS plates 11 and 12 are bonded together using the double-sided adhesive tape 8 cut into 20 mm ⁇ 40 mm. At 80 ° C., one end of one SUS plate 11 is fixed, and one end of the other SUS plate 12 is pulled by a 200 g weight 13 in the horizontal direction for 3 minutes. At this time, the amount of displacement by which the double-sided adhesive tape 8 is displaced in the pulling direction is measured. It means that the smaller the displacement, the higher the cohesive force of the pressure-sensitive adhesive layer.
  • the pressure-sensitive adhesive layer preferably has a peel length at 80 ° C. measured by a constant load peel test of 5 mm or less.
  • the peel length is 5 mm or less, the wettability of the pressure-sensitive adhesive layer (adhesive strength at the interface with the adherend) is sufficient.
  • a more preferable upper limit of the peeling length is 2 mm.
  • the lower limit of the peeling length is not particularly limited.
  • the constant load peel test is performed as follows. In FIG. 2, the schematic diagram which shows the constant load peeling test of an adhesive layer is shown.
  • a double-sided adhesive tape cut to 20 mm x 50 mm was bonded to a polycarbonate plate, and a 2 kg rubber roller was reciprocated once at a speed of 300 mm / min on the double-sided adhesive tape. Leave for 24 hours.
  • the polycarbonate plate 15 is placed so that the surface on which the double-sided pressure-sensitive adhesive tape 14 is bonded is downward and in a horizontal state. Is pulled vertically by a 100 g weight 16.
  • the maximum length L of the peeled portion 48 hours after the weight 16 is attached to the double-sided pressure-sensitive adhesive tape 14 is measured and set as the peel length.
  • the wettability (adhesive strength at the interface with the adherend) of the pressure-sensitive adhesive layer can be enhanced, for example, by adjusting the composition of the acrylic copolymer and adding a tackifying resin.
  • the thickness of the said adhesive layer is not specifically limited, The preferable minimum of the thickness of the adhesive layer of one side is 10 micrometers, and a preferable upper limit is 100 micrometers. If the thickness of the said adhesive layer is 10 micrometers or more, it can suppress that the tackiness of the said adhesive layer falls, and can affix a double-sided adhesive tape on a to-be-adhered body favorably. If the thickness of the said adhesive layer is 100 micrometers or less, when processing the said adhesive layer or a double-sided adhesive tape, it can suppress that an adhesive oozes out and can prevent a process defect. The minimum with more preferable thickness of the said adhesive layer is 15 micrometers, and a more preferable upper limit is 90 micrometers. The thickness of the pressure-sensitive adhesive layer can be measured using a dial thickness meter (for example, “ABS Digimatic Indicator” manufactured by Mitutoyo).
  • the force applied to the double-sided pressure-sensitive adhesive tape is 55 N or less when the elongation is 0.5 mm, measured by the following tensile test. (Tensile test) Using a double-sided adhesive tape cut to 25 mm ⁇ 25 mm, a polycarbonate plate having a thickness of 2 mm and a jig made of stainless steel having a thickness of 2 mm are bonded together. After fixing the polycarbonate plate, the stainless steel jig is pulled in the direction perpendicular to the surface at a rate of 0.1 mm / min, and the force applied to the double-sided adhesive tape is measured.
  • FIG. 3 the schematic diagram which shows the tension test to the surface perpendicular
  • a double-sided adhesive tape 1 cut to 25 mm ⁇ 25 mm, a jig made of 2 mm thick polycarbonate plate (length 50 mm ⁇ width 50 mm) 2 and 2 mm thick stainless steel (30 mm ⁇ 30 mm) (Not shown, but with a handle) 3 is laminated.
  • This laminate was pressure-bonded using a roller under conditions of 5 kg for 10 seconds, and then allowed to stand for 24 hours to produce a sample for tensile test in which the polycarbonate plate 2 and the jig 3 were bonded together via the double-sided adhesive tape 1. To do. After fixing the polycarbonate plate 2 of the sample for the tensile test, the jig 3 is pulled at a condition of 0.1 mm / min in the surface vertical direction (the arrow direction in the figure) under the condition of 23 ° C. The force is measured.
  • the measurement of elongation is started by starting a stroke where a force of 1 N is applied to the double-sided adhesive tape 1 (elongation 0 mm), and the force applied to the double-sided adhesive tape is measured when the elongation is 0.5 mm.
  • the force applied to the double-sided pressure-sensitive adhesive tape is measured at a very low speed of 0.1 mm / min, not at a speed of 300 mm / min specified in JIS Z 0237.
  • the performance of the double-sided pressure-sensitive adhesive tape can be evaluated in a state where the peeling stress at low speed generated when a restoring force or repulsive force is applied to the double-sided pressure-sensitive adhesive tape is reproduced (assumed).
  • FIG. 4 shows a force-elongation curve with the horizontal axis representing the elongation (mm) of the double-sided adhesive tape in the tensile test and the vertical axis representing the force (test force) (N) applied to the double-sided adhesive tape in the tensile test.
  • the present inventors evaluated the relationship between the force-elongation curve shown in FIG. 4 and the adhesive reliability of the double-sided pressure-sensitive adhesive tape in a state where a restoring force and a repulsive force were applied. As a result, the present inventors have found that the slope of the force-elongation curve needs to be gradual in order to obtain high adhesion reliability even in a state where a restoring force or a repulsive force is applied. It was.
  • the present inventors adjusted the force applied to the double-sided adhesive tape to 55 N or less when the elongation is 0.5 mm as measured by the above tensile test, so that the double-sided adhesive in a state where a restoring force and a repulsive force are applied. It was found that the adhesive reliability of the tape can be improved.
  • the force applied to the double-sided pressure-sensitive adhesive tape measured by the tensile test when the elongation is 0.5 mm is preferably 50 N or less, more preferably 45 N or less, and even more preferably 40 N or less.
  • the slope of the force-elongation curve is large, the force applied to the double-sided adhesive tape is large even with a slight displacement (elongation). Cheap.
  • the lower limit of the force applied to the double-sided pressure-sensitive adhesive tape when the elongation is 0.5 mm as measured by the tensile test is not particularly limited, but 1N or more is preferable. If the force applied to the double-sided pressure-sensitive adhesive tape is 1N or more when the elongation is 0.5 mm as measured by the above tensile test, it is possible to suppress the displacement (elongation) from becoming too large with a little force and difficult to peel off In addition, the double-sided adhesive tape is difficult to stretch, and sufficient adhesion and fixation can be realized.
  • the force applied to the double-sided adhesive tape when the elongation is 0.5 mm as measured by the tensile test is more preferably 5N or more.
  • the minimum of the force concerning the double-sided adhesive tape measured by the said tension test is not specifically limited, 1N or more is preferable. If the force applied to the double-sided pressure-sensitive adhesive tape measured by the tensile test is 1 N or more, it is possible to suppress the displacement (elongation) from becoming too large with a little force, and not only is difficult to peel off, but also the double-sided pressure-sensitive adhesive tape stretches. It becomes difficult and sufficient adhesion and fixation can be realized. As for the force concerning the double-sided adhesive tape measured by the said tension test, 5 N or more is more preferable.
  • a substrate having an open cell structure In order to adjust the force applied to the double-sided pressure-sensitive adhesive tape when measured by the tensile test within the above range, it is preferable to use a substrate having an open cell structure, and the composition, manufacturing method, density of the substrate. It is preferable to adjust the 25% compressive strength, the maximum and minimum values of the shear storage modulus, the thickness, and the like.
  • the double-sided pressure-sensitive adhesive tape of the present invention preferably has a breaking strength (force applied to the double-sided pressure-sensitive adhesive tape when the double-sided pressure-sensitive adhesive tape breaks in the above-mentioned tensile test) measured by a tensile test in the direction perpendicular to the surface is 60 N or more. . If the breaking strength is 60 N or more, the base material can be prevented from tearing between layers.
  • the upper limit of the said breaking strength is not specifically limited, From a viewpoint which does not impair stress relaxation property, a preferable upper limit is 160N and a more preferable upper limit is 120N.
  • the double-sided pressure-sensitive adhesive tape of the present invention preferably has a breaking strength measured by a shear tensile test of 9 N or more. If the breaking strength is 9 N or more, the base material can be prevented from tearing between layers. A more preferable lower limit of the breaking strength is 12N. Although the upper limit of the said breaking strength is not specifically limited, From a viewpoint which does not impair stress relaxation property, a preferable upper limit is 30N and a more preferable upper limit is 20N.
  • the shear tensile test is performed as follows. In FIG. 5, the schematic diagram which shows the shear tension test of a double-sided adhesive tape is shown. First, a double-sided pressure-sensitive adhesive tape having a pressure-sensitive adhesive layer formed on both sides of a base material is prepared.
  • two double-sided pressure-sensitive adhesive tapes 18 cut to 25 mm ⁇ 4 mm and two 2 mm-thick polycarbonate plates (length 125 mm ⁇ width 50 mm) 19 are laminated and bonded together as shown in FIG.
  • the laminate was pressure-bonded using a weight under the conditions of 5 kg and 10 seconds, and then allowed to stand for 24 hours to obtain a sample for shear tensile test in which two polycarbonate plates 19 were bonded via a double-sided adhesive tape 18. .
  • the upper one of the other polycarbonate plate 19 was sheared (in the direction of the arrow in the figure) at 0.1 mm / min under the condition of 23 ° C.
  • the force (breaking point strength) applied to the double-sided pressure-sensitive adhesive tape when the double-sided pressure-sensitive adhesive tape 18 breaks is measured.
  • the peeling limit value of the double-sided adhesive tape in 60 degreeC measured by the tack test is 350 gf * s or more.
  • the peeling limit value is an index for evaluating the stress relaxation property of the entire double-sided pressure-sensitive adhesive tape, and can be measured by the following tack test.
  • the tack test is performed as follows. First, a double-sided pressure-sensitive adhesive tape is placed on a plate set at 60 ° C. of a tack tester (for example, TAC-1000 manufactured by Reska Co.) so that the pressure-sensitive adhesive layer is on top. The non-measurement surface of the double-sided pressure-sensitive adhesive tape is backed with a film such as a polyethylene terephthalate (PET) film. Next, a cylindrical stainless steel probe having a diameter of 5 mm is pressed against the double-sided adhesive tape at a probe temperature of 60 ° C., a pressing speed of 2 mm / s, and a pressing load of 100 gf, and held in that state for 0.1 second. Thereafter, the probe is pulled up at a lifting speed of 0.2 mm / s. The force applied to the double-sided adhesive tape during this period is measured.
  • a tack tester for example, TAC-1000 manufactured by Reska Co.
  • FIG. 6 schematically shows an example of a force-time curve showing the force applied to the double-sided pressure-sensitive adhesive tape at 60 ° C. measured by a tack test.
  • the force-time curve 17 is a force-time curve showing the force applied to the double-sided pressure-sensitive adhesive tape at 60 ° C. measured by a tack test. In the tack test, when the probe is pressed against the double-sided adhesive tape (A in FIG.
  • the force-time curve 17 descends, and then when the probe starts to be pulled up (B in FIG. 6), the force-time Curve 17 rises.
  • An integrated value (C in FIG. 6) from time T 1 at which the force is 0 to time T 2 at which the maximum force (peak top) is shown is calculated, and this is taken as the peeling limit value.
  • the method for adjusting the peeling limit value to the above range is not particularly limited, but in order to increase the peeling limit value, from time T 1 when the force is 0 to time T 2 where the maximum force (peak top) is shown.
  • a longer time that is, a longer peeling time is preferable.
  • it is so preferable that the maximum force is large.
  • a preferable lower limit of the peeling time is 2.7 seconds, and a more preferable lower limit is 3.5 seconds.
  • a preferable lower limit of the maximum force is 200 gf, and a more preferable lower limit is 225 gf.
  • a method of increasing the peeling limit value for example, a method of increasing the stress relaxation property of the substrate by adjusting physical properties of the substrate, a cohesive force (bulk strength) and / or wettability of the pressure-sensitive adhesive layer ( And a method for increasing the adhesive strength at the interface with the adherend.
  • a method for improving the stress relaxation property of the substrate by adjusting the physical properties of the substrate for example, after using a foam as the substrate, the thickness, density, glass transition point, 25% of the foam
  • a method for adjusting the compression strength and the like can be mentioned.
  • an acrylic copolymer is used for the pressure-sensitive adhesive layer and the acrylic copolymer is used.
  • examples thereof include a method for reducing the content of the low molecular weight component of the polymer.
  • the method of making small ratio (molecular weight distribution, Mw / Mn) of the weight average molecular weight (Mw) with respect to the number average molecular weight (Mn) of this acrylic copolymer is mentioned.
  • the method of adjusting the composition of this acrylic copolymer after using the acrylic adhesive layer containing the acrylic copolymer obtained by living radical polymerization is preferable.
  • the cohesive force (bulk strength) of the pressure-sensitive adhesive layer can be evaluated by, for example, a cohesive force test, and the wettability (adhesive strength at the interface with the adherend) of the pressure-sensitive adhesive layer is, for example, constant. It can be evaluated by a load peel test.
  • the density of the base material is preferably 490 kg / m 3 or less. If the density is 490 kg / m 3 or less, the base material can have appropriate flexibility, so that the stress relaxation property of the base material is increased and the peeling limit value can be easily adjusted to an appropriate range. Become. A more preferable upper limit of the density is 450 kg / m 3 .
  • the 25% compressive strength of the substrate is preferably 38 kPa or less. If the 25% compressive strength is 38 kPa or less, the base material can have appropriate flexibility, so that the stress relaxation property of the base material is increased and the peeling limit value can be easily adjusted to an appropriate range. Become. Moreover, if the 25% compressive strength is 38 kPa or less, the double-sided pressure-sensitive adhesive tape can be favorably bonded.
  • the glass transition point of the substrate is preferably 5 ° C. or higher. If the glass transition point of the base material is 5 ° C. or higher, the base material has appropriate flexibility, and the peeling limit value can be easily adjusted to an appropriate range.
  • the thickness of the substrate is preferably larger than 0.9 mm. If the thickness is larger than 0.9 mm, the base material can have appropriate flexibility, so that the stress relaxation property of the base material becomes high and the peeling limit value can be easily adjusted to an appropriate range. A more preferable lower limit of the thickness is 1 mm.
  • the preferable lower limit of the thickness of the pressure-sensitive adhesive layer on one side is 20 ⁇ m.
  • the more preferable lower limit of the thickness of the pressure-sensitive adhesive layer is 30 ⁇ m, and the more preferable upper limit is 80 ⁇ m.
  • the shear storage modulus of the double-sided pressure-sensitive adhesive tape of the present invention is not particularly limited, but the frequency in the master curve measured at a reference temperature of 23 ° C. measured with a dynamic viscoelastic device is 1.0 ⁇ 10 ⁇ 4 to 1.0 ⁇ 10.
  • the maximum value of the shear storage modulus in the ⁇ 5 Hz region is preferably 1.0 ⁇ 10 5 Pa or less.
  • the frequency range is a frequency corresponding to a peeling stress at a low speed generated when a restoring force or a repulsive force is applied to the double-sided pressure-sensitive adhesive tape.
  • the maximum value of the shear storage modulus in the frequency range is 1.0 ⁇ 10 5 Pa or less, the stress when the restoring force or repulsive force is applied to the double-sided adhesive tape is relaxed, and the adhesive reliability of the double-sided adhesive tape Can be improved.
  • the minimum value of the shear storage elastic modulus in the frequency region is not particularly limited, it is preferably 1.0 ⁇ 10 3 Pa or more. If the minimum value of the shear storage elastic modulus in the frequency region is 1.0 ⁇ 10 3 Pa or more, it is possible to suppress the double-sided pressure-sensitive adhesive tape from being excessively stretched and realize sufficient adhesion and fixation.
  • the shear storage modulus is in the range of ⁇ 60 ° C. to 250 ° C.
  • the thickness of the pressure-sensitive adhesive layer applied on both sides of the base material is 15% or less of the thickness of the base material, the measured shear storage modulus value is dominated by the influence of the base material.
  • the effect of the pressure-sensitive adhesive layer is relatively small.
  • the 180 degree adhesive force of the double-sided adhesive tape of this invention is not specifically limited, A preferable minimum is 3 N / 25mm and a preferable upper limit is 35 N / 25mm. If the 180 ° adhesive strength of the double-sided pressure-sensitive adhesive tape of the present invention is 3 N / 25 mm or more, tackiness is sufficient, and workability when the double-sided pressure-sensitive adhesive tape is attached to an adherend is improved. When the 180 ° adhesive strength of the double-sided pressure-sensitive adhesive tape of the present invention is 35 N / 25 mm or less, the rework property becomes high and re-attachment becomes possible. In addition, 180 degree adhesive force can be calculated
  • the thickness of the double-sided pressure-sensitive adhesive tape of the present invention is not particularly limited, but a preferred lower limit is 0.4 mm and a preferred upper limit is 3 mm. If the thickness of the double-sided pressure-sensitive adhesive tape of the present invention is 0.4 mm or more, the double-sided pressure-sensitive adhesive tape is difficult to peel off even if restoring force or repulsive force is applied. If the thickness of the double-sided pressure-sensitive adhesive tape of the present invention is 3 mm or less, sufficient adhesion and fixation can be realized. The minimum with more preferable thickness of the double-sided adhesive tape of this invention is 0.5 mm, and a more preferable upper limit is 2.8 mm.
  • a solution of an adhesive A is prepared by adding a solvent to an acrylic copolymer, a tackifier resin, and a cross-linking agent as necessary, and the solution of the adhesive A is applied to the surface of the substrate.
  • the solvent is completely removed by drying to form the pressure-sensitive adhesive layer A.
  • the release film is superimposed on the pressure-sensitive adhesive layer A so that the release treatment surface faces the pressure-sensitive adhesive layer A.
  • a release film different from the above release film is prepared, the adhesive B solution is applied to the release treatment surface of the release film, and the solvent in the solution is completely removed by drying, thereby releasing the release film.
  • a laminated film in which the pressure-sensitive adhesive layer B is formed on the surface of the mold film is produced.
  • the obtained laminated film is laminated on the back surface of the base material on which the pressure-sensitive adhesive layer A is formed, with the pressure-sensitive adhesive layer B facing the back surface of the base material to produce a laminate.
  • the double-sided adhesive tape which has an adhesive layer on both surfaces of a base material, and the surface of the adhesive layer was covered with the release film can be obtained.
  • two sets of laminated films are produced in the same manner, and a laminated body is produced by superposing these laminated films on both sides of the base material with the adhesive layer of the laminated film facing the base material.
  • a double-sided pressure-sensitive adhesive tape having an adhesive layer on both surfaces of the base material and having the surface of the adhesive layer covered with a release film may be obtained.
  • the use of the double-sided pressure-sensitive adhesive tape of the present invention is not particularly limited.
  • the shape of the double-sided pressure-sensitive adhesive tape of the present invention in these applications is not particularly limited, and examples thereof include a rectangle, a frame shape, a circle, an ellipse, and a donut shape.
  • the double-sided pressure-sensitive adhesive tape of the present invention is excellent in adhesion reliability in a state where peeling stress at low speed such as restoring force and repulsive force is applied, so it can be attached to a step, corner, non-planar part, etc. It is preferably used for fixing in a deformed state.
  • Articles using the double-sided adhesive tape of the present invention include, for example, flat panel displays used in TVs, monitors, portable electronic devices, camera modules for portable electronic devices, internal members of portable electronic devices, vehicle interiors, home appliances ( For example, the interior and exterior of a TV, an air conditioner, a refrigerator, etc.) can be mentioned.
  • Examples of the adherend of the double-sided pressure-sensitive adhesive tape of the present invention include side panels, back panels, various nameplates, decorative films, decorative films and the like of portable electronic devices.
  • the double-sided adhesive tape excellent in the restoring force can be provided.
  • FIG. 6 is a diagram schematically showing force-time curves obtained in Example 1, Example 9 and Example 15. It is a schematic diagram which shows the resilience test of a double-sided adhesive tape.
  • PU1 Manufacture of polyurethane foam 1 (PU1)) To 100 parts by weight of polyol 1 shown below, 0.7 parts by weight of an amine catalyst (Dabco LV33, manufactured by Sankyo Air Products) and 1 part by weight of a foam stabilizer (SZ5740M, manufactured by Toray Dow Corning) are added and stirred. Thereafter, polyisocyanate (Cosmonate TM-20, manufactured by Mitsui Chemicals Co., Ltd.) was adjusted and added so as to have an isocyanate index of 80. Thereafter, the mixture was mixed and stirred with nitrogen gas to obtain a solution in which fine bubbles were mixed.
  • an amine catalyst Dabco LV33, manufactured by Sankyo Air Products
  • SZ5740M foam stabilizer
  • the solution was applied to a predetermined thickness using an applicator on a 50 ⁇ m thick PET separator (V-2, manufactured by Nipper Co.), the foam raw material was reacted, and polyurethane foam 1 having physical properties shown in Table 2 ( PU1) was obtained.
  • Polyol 1 polyether polyol A (weight average molecular weight 6000, hydroxyl number 3, hydroxyl value 56 mgKOH / g) 20 parts by weight, polyester polyol A (weight average molecular weight 6000, hydroxyl number 3, hydroxyl value 240 mgKOH / g) 40 parts by weight, Polyether polyol B (weight average molecular weight 6000, hydroxyl number 3, hydroxyl value 240 mgKOH / g) 40 parts by weight)
  • the obtained polyurethane foam 1 (PU1) was cut into 50 mm squares, immersed in liquid nitrogen for 1 minute, and then cut with a razor blade along a plane parallel to the thickness direction.
  • a digital microscope Keyence Co., “VHX-500”
  • VHX-500 digital microscope
  • PU1 had an open cell structure.
  • the cell structure of the foam was confirmed by the same method.
  • the density of the foam was measured using an electronic hydrometer (“ED120T” manufactured by Mirage) according to JIS K 6401. Further, the 25% compressive strength of the foam was measured according to JIS K 6254. Further, the glass transition point of the foam was measured using a viscoelasticity measuring device (“Rheometrics Dynamic Analyze RDA-700” manufactured by Rheometrics), a measurement temperature of ⁇ 30 to 100 ° C., a heating rate of 3 ° C./min, and a frequency of 1 Hz. The measurement was performed under the following conditions. Hereinafter, the density, 25% compressive strength, and glass transition point of the foam were confirmed by the same method.
  • Polyurethane foam 2 (Manufacture of polyurethane foam 2 (PU2)) Polyurethane having the physical properties shown in Table 2 in the same manner as in the production of polyurethane foam 1 (PU1) except that 100 parts by weight of polyol 2 shown below is used in place of polyol 1 and the amount of nitrogen gas mixed therein is adjusted. Foam 2 (PU2) was obtained.
  • the polyurethane foam 2 had an open cell structure.
  • Polyol 2 (polyether polyol C (weight average molecular weight 6000, hydroxyl number 3, hydroxyl value 48 mgKOH / g))
  • a polyurethane foam 3 (PU3) having the physical properties shown in Table 2 was obtained in the same manner as in the production of polyurethane foam 2 (PU2) except that the amount of nitrogen gas to be mixed was adjusted.
  • the polyurethane foam 3 had an open cell structure.
  • polyurethane foam 4 (PU4)) Instead of polyol 1, 100 parts by weight of polyol 3 shown below was used, the isocyanate index was changed to 100, and the amount of nitrogen gas mixed in was adjusted in the same manner as in the production of polyurethane foam 1 (PU1). A polyurethane foam 4 (PU4) having physical properties shown in Table 2 was obtained. The polyurethane foam 4 had an open cell structure.
  • Polyol 3 (polyether polyol D (weight average molecular weight 3000, hydroxyl number 3, hydroxyl value 38 mgKOH / g))
  • the polyurethane foam 5 (PU5) having the physical properties shown in Table 2 was prepared in the same manner as in the production of the polyurethane foam 3 (PU3) except that the isocyanate index was changed to 100 and the amount of mixed nitrogen gas was adjusted. Obtained.
  • the polyurethane foam 5 had an open cell structure.
  • Polyurethane foam 6 (Manufacture of polyurethane foam 6 (PU6)) Polyurethane foam having the physical properties shown in Table 2 in the same manner as in the production of polyurethane foam 1 (PU1) except that 100 parts by weight of polyol 4 shown below was used in place of polyol 1 and the isocyanate index was changed to 110. 6 (PU6) was obtained.
  • the polyurethane foam 6 had an open cell structure.
  • Polyol 4 (polyether polyol A (weight average molecular weight 6000, hydroxyl number 3, hydroxyl value 56 mgKOH / g) 60 parts by weight, polyester polyol A (weight average molecular weight 6000, hydroxyl number 3, hydroxyl value 240 mgKOH / g) 40 parts by weight)
  • a polyurethane foam 7 (PU7) having the physical properties shown in Table 2 was obtained in the same manner as in the production of the polyurethane foam 6 (PU6) except that the amount of nitrogen gas to be mixed was adjusted.
  • the polyurethane foam 7 had an open cell structure.
  • a polyurethane foam 8 (PU8) having the physical properties shown in Table 2 was obtained in the same manner as in the production of the polyurethane foam 6 (PU6) except that the isocyanate index was changed to 115.
  • the polyurethane foam 8 had an open cell structure.
  • a polyurethane foam 9 (PU9) having the physical properties shown in Table 2 was obtained in the same manner as in the production of the polyurethane foam 6 (PU6) except that 100 parts by weight of the polyol 5 shown below was used instead of the polyol 4. .
  • the polyurethane foam 9 had an open cell structure.
  • Polyol 5 (polyether polyol A (weight average molecular weight 6000, hydroxyl number 3, hydroxyl value 56 mgKOH / g) 70 parts by weight, polyester polyol A (weight average molecular weight 6000, hydroxyl number 3, hydroxyl value 240 mgKOH / g) 30 parts by weight)
  • a polyurethane foam 10 (PU10) having the physical properties shown in Table 2 was obtained in the same manner as in the production of polyurethane foam 1 (PU1) except that 100 parts by weight of polyol 6 shown below was used instead of polyol 1. .
  • the polyurethane foam 10 had an open cell structure.
  • Polyol 6 (polyether polyol A (weight average molecular weight 6000, hydroxyl number 3, hydroxyl value 56 mgKOH / g) 20 parts by weight, polyester polyol A (weight average molecular weight 6000, hydroxyl number 3, hydroxyl value 240 mgKOH / g) 20 parts by weight, Polyether polyol B (weight average molecular weight 6000, hydroxyl number 3, hydroxyl value 240 mgKOH / g) 20 parts by weight, polyester polyol B (weight average molecular weight 6000, hydroxyl number 3, hydroxyl value 56 mgKOH / g) 40 parts by weight)
  • a polyurethane foam 11 (PU11) having the physical properties shown in Table 2 was obtained in the same manner as in the production of the polyurethane foam 6 (PU6) except that the amount of nitrogen gas to be mixed was adjusted.
  • the polyurethane foam 11 had an open cell structure.
  • Polyurethane foam 12 having the physical properties shown in Table 2 in the same manner as in the production of polyurethane foam 1 (PU1) except that the isocyanate index was changed to 130 using polyol 7 shown below instead of polyol 1. PU12) was obtained.
  • the polyurethane foam 12 had an open cell structure.
  • Polyol 7 (polyether polyol E (weight average molecular weight 1000, hydroxyl number 4, hydroxyl value 30 mgKOH / g) 100 parts by weight)
  • Polyethylene foam 1 (PE1)) XLH-2501 (manufactured by Sekisui Chemical Co., Ltd.) was used as polyethylene foam 1 (PE1).
  • the polyethylene foam 1 had a closed cell structure.
  • Polyethylene foam 2 (PE2)) XLH-2001 (manufactured by Sekisui Chemical Co., Ltd.) was used as polyethylene foam 2 (PE2).
  • the polyethylene foam 2 had a closed cell structure.
  • Polyethylene foam 3 (PE3)) IF08008 (manufactured by Sekisui Chemical Co., Ltd.) was used as polyethylene foam 3 (PE3).
  • the polyethylene foam 3 had a closed cell structure.
  • Polyethylene foam 4 (PE4)) XLH-1001 (manufactured by Sekisui Chemical Co., Ltd.) was used as polyethylene foam 4 (PE4).
  • the polyethylene foam 4 had a closed cell structure.
  • the monomer mixture (97 parts by weight of 2-ethylhexyl acrylate (2EHA), 3 parts by weight of acrylic acid (AAc), A total of 100 g of hydroxyethyl (2HEA) 0.1 parts by weight) and 66.5 g of ethyl acetate as a polymerization solvent were added.
  • a polymerization reaction was performed at 60 ° C. for 20 hours to obtain an acrylic copolymer-containing solution.
  • the obtained acrylic copolymer-containing solution was diluted 50-fold with tetrahydrofuran (THF), and the resulting diluted solution was filtered through a filter (material: polytetrafluoroethylene, pore diameter: 0.2 ⁇ m).
  • the obtained filtrate was supplied to a gel permeation chromatograph (Waters, 2690 Separations Model), and GPC measurement was performed under the conditions of a sample flow rate of 1 ml / min and a column temperature of 40 ° C., and the acrylic copolymer was converted to polystyrene.
  • the molecular weight was measured to determine the weight average molecular weight (Mw) and the molecular weight distribution (Mw / Mn).
  • GPC KF-806L manufactured by Showa Denko
  • a differential refractometer was used as the detector. The results are shown in Table 1.
  • Ethyl acetate is added to 100 parts by weight of the nonvolatile content of the resulting acrylic copolymer-containing solution and stirred to total 30 parts by weight of tackifying resin (10 parts by weight of hydrogenated rosin resin, 10 parts by weight of rosin ester resin). Part, 10 parts by weight of a terpene phenol resin) and stirred to obtain a pressure-sensitive adhesive having a nonvolatile content of 30% by weight.
  • a monomer mixture (60 parts by weight of butyl acrylate (BA), 36.9 parts by weight of 2-ethylhexyl acrylate (2EHA), 3 parts by weight of acrylic acid (AAc), and 2-hydroxyethyl acrylate (2HEA) ) 0.1 parts by weight) was added dropwise uniformly and gradually over 1 hour 30 minutes. 30 minutes after the completion of the dropping, 0.1 part by weight of azobisisobutyronitrile is added, the polymerization reaction is further performed for 5 hours, and ethyl acetate is added to the reactor and cooled while diluting to thereby prepare an acrylic copolymer-containing solution. Got. In the same manner as described above, the weight average molecular weight (Mw) and molecular weight distribution (Mw / Mn) of the acrylic copolymer were determined.
  • BA butyl acrylate
  • 2EHA 2-ethylhexyl acrylate
  • AAc acrylic acid
  • 2-HEA 2-hydroxyethyl
  • Ethyl acetate is added to 100 parts by weight of the nonvolatile content of the resulting acrylic copolymer-containing solution and stirred to total 30 parts by weight of tackifying resin (10 parts by weight of hydrogenated rosin resin, 10 parts by weight of rosin ester resin). Part, 10 parts by weight of a terpene phenol resin) and stirred to obtain a pressure-sensitive adhesive having a nonvolatile content of 30% by weight.
  • Ethyl acetate is added to 100 parts by weight of the nonvolatile content of the resulting acrylic copolymer-containing solution and stirred to total 30 parts by weight of tackifying resin (10 parts by weight of hydrogenated rosin resin, 10 parts by weight of rosin ester resin). Part, 10 parts by weight of a terpene phenol resin) and stirred to obtain a pressure-sensitive adhesive having a nonvolatile content of 30% by weight.
  • Example 1 Manufacture of double-sided pressure-sensitive adhesive tape A release paper having a thickness of 150 ⁇ m is prepared, adhesive A is applied to the release-treated surface of this release paper, and dried at 100 ° C. for 5 minutes, whereby an adhesive layer having a thickness of 50 ⁇ m Formed. This pressure-sensitive adhesive layer was bonded to the surface of polyurethane foam 1 (PU1). Next, in the same manner, the same pressure-sensitive adhesive layer as above was bonded to the opposite surface of this polyurethane foam 1 (PU1) after the PET separator was peeled off. Thereafter, curing was carried out by heating at 40 ° C. for 48 hours to obtain a double-sided pressure-sensitive adhesive tape having a thickness of 1.1 mm covered with a release paper having a thickness of 150 ⁇ m.
  • FIG. 1 the schematic diagram which shows the cohesion force test of an adhesive layer was shown.
  • two SUS plates 11 and 12 were bonded using a double-sided adhesive tape 8 cut to 20 mm ⁇ 40 mm.
  • 80 ° C. one end of one SUS plate 11 was fixed, and one end of the other SUS plate 12 was pulled horizontally by a 200 g weight 13 for 3 minutes.
  • the amount of displacement by which the double-sided adhesive tape 8 was displaced in the pulling direction was measured.
  • FIG. 2 the schematic diagram which shows the constant load peeling test of an adhesive layer was shown.
  • a double-sided adhesive tape cut to 20 mm x 50 mm was bonded to a polycarbonate plate, and a 2 kg rubber roller was reciprocated once at a speed of 300 mm / min on the double-sided adhesive tape. Left for 24 hours.
  • the polycarbonate plate 15 is placed so that the surface on which the double-sided pressure-sensitive adhesive tape 14 is bonded is downward and in a horizontal state.
  • the maximum length L of the peeled portion 48 hours after attaching the weight 16 to the double-sided adhesive tape 14 was measured and set as the peel length.
  • This laminate was pressure-bonded using a roller under conditions of 5 kg for 10 seconds, and then allowed to stand for 24 hours to produce a sample for tensile test in which the polycarbonate plate 2 and the jig 3 were bonded together via the double-sided adhesive tape 1. did.
  • the jig 3 is pulled at a condition of 0.1 mm / min in the surface vertical direction (the arrow direction in the figure) under the condition of 23 ° C. Such force was measured.
  • the measurement of elongation was started by starting a stroke where a force of 1 N was applied to the double-sided adhesive tape 1 (elongation 0 mm), and the force applied to the double-sided adhesive tape was measured when the elongation was 0.5 mm. Further, the force (breaking point strength) applied to the double-sided pressure-sensitive adhesive tape when the double-sided pressure-sensitive adhesive tape broke was measured.
  • the peeling stroke shown in Table 2 is the elongation of the double-sided pressure-sensitive adhesive tape until it breaks.
  • Double-sided adhesive tape was cut into a width of 6 mm ⁇ 10 mm and set in a shear measurement jig of a dynamic viscoelasticity measuring apparatus (DVA-200 manufactured by IT Measurement Co., Ltd.). .
  • the heating rate 5 ° C. / in the range of -60 ° C. ⁇ 250 ° C. by measuring the shear storage modulus as a min, a frequency 1.0 ⁇ 10 -4 ⁇ at 23 ° C. By combining the master curve at a reference temperature 23 ° C.
  • the maximum value of the shear storage modulus in the 1.0 ⁇ 10 ⁇ 5 Hz region was determined.
  • Table 2 the logarithm (log G ′) of the maximum value of the shear storage elastic modulus is shown.
  • FIG. 5 is a schematic diagram showing a shear tensile test of a double-sided pressure-sensitive adhesive tape.
  • the double-sided adhesive tape 18 cut to 25 mm ⁇ 4 mm and two polycarbonate plates 19 (length 125 mm ⁇ width 50 mm) 19 having a thickness of 2 mm were laminated and bonded together as shown in FIG.
  • the laminate was pressure-bonded using a weight under conditions of 5 kg and 10 seconds, and then allowed to stand for 24 hours to obtain a sample for shear tensile test in which two polycarbonate plates 19 were bonded via a double-sided adhesive tape 18. .
  • Tack test A double-sided pressure-sensitive adhesive tape was placed on a plate set to 60 ° C of a tack tester (TAC-1000 manufactured by Reska Co., Ltd.) with the pressure-sensitive adhesive layer facing up. The non-measurement surface of the double-sided pressure-sensitive adhesive tape was lined with a polyethylene terephthalate (PET) film. Next, a cylindrical stainless steel probe having a diameter of 5 mm was pressed against the double-sided adhesive tape at a probe temperature of 60 ° C., a pressing speed of 2 mm / s, and a pressing load of 100 gf, and held in that state for 0.1 second.
  • TAC-1000 manufactured by Reska Co., Ltd.
  • the probe was pulled up at a lifting speed of 0.2 mm / s, and the force applied to the double-sided adhesive tape during this period was measured.
  • the resulting force - in time curve to calculate an integral value of from time T 1 the force indicating 0 to the time T 2 which shows the maximum force (peak top), which was used as a peeling limit values.
  • Table 2 also shows the peeling time and the maximum force.
  • Examples 2 to 15, Comparative Examples 1 to 3 A double-sided pressure-sensitive adhesive tape was obtained in the same manner as in Example 1 except that the base material and the pressure-sensitive adhesive layer were changed as shown in Table 2.
  • FIG. 7 schematically shows force-time curves obtained in Example 1, Example 9, and Example 15.
  • FIG. 8 is a schematic diagram showing a resilience resistance test of a double-sided pressure-sensitive adhesive tape.
  • a double-sided pressure-sensitive adhesive tape 4 cut to a length of 150 mm ⁇ width of 3 mm
  • a first polycarbonate plate A 150 mm length ⁇ width 30 mm ⁇ thickness 1 mm
  • a second A polycarbonate plate (length 200 mm ⁇ width 30 mm ⁇ thickness 1 mm) 6 for restoring resistance test was laminated.
  • the laminate was pressure-bonded using a roller under the condition of 2 kg, and then allowed to stand for 24 hours, to prepare a sample for a resilience test in which two polycarbonate plates were bonded together with a double-sided adhesive tape 4.
  • the sample for the resilience test is sandwiched between the jigs 7 with the second resilience test polycarbonate plate 6 facing up, and the width of the jig 7 is reduced to 165 mm.
  • the sample for the resilience test was warped in a bow shape (condition 1).
  • the curvature of the sample for the resilience test at this time was 0.181 m.
  • x indicates that lifting occurred within 6 hours after bowing, and lifting occurred within 24 hours beyond 6 hours The case was evaluated as ⁇ , and the case where no floating occurred even after 24 hours was evaluated as ⁇ .
  • first polycarbonate plate A for resilience test (length 150 mm ⁇ width 30 mm ⁇ thickness 1 mm)
  • a first resilience test polycarbonate plate B (length 150 mm ⁇ width 30 mm ⁇ thickness 2 mm) is used.
  • the occurrence of floating was observed under the same conditions (Condition 2).
  • the case where the time (peeling time) from the bowing to the occurrence of peeling (peeling time) was within 30 minutes was indicated as x
  • the case where it exceeded 30 minutes and within 60 minutes was indicated as ⁇
  • the case where it exceeded 60 minutes was indicated as ⁇ .
  • the double-sided adhesive tape excellent in the restoring force can be provided.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Adhesive Tapes (AREA)
  • Adhesives Or Adhesive Processes (AREA)

Abstract

Le but de la présente invention est d'obtenir une bande auto-adhésive double face présentant une excellente résistance à l'abrasion. La bande auto-adhésive double face de la présente invention comprend un substrat et des couches auto-adhésives disposées sur les deux surfaces de celui-ci. Lorsque la bande auto-adhésive double face est examinée dans le test de traction suivant, la force appliquée sur la bande auto-adhésive double face à un allongement de 0,5 mm est de 55 N ou moins. (Essai de traction) La bande auto-adhésive double face découpée en pièces de 25 mm x 25 mm est utilisée pour lier une plaque de polycarbonate de 2 mm d'épaisseur à un gabarit constitué d'acier inoxydable de 2 mm d'épaisseur. La plaque de polycarbonate est fixée, puis le gabarit en acier inoxydable est tiré à 0,1 mm/min dans la direction perpendiculaire au plan pour mesurer la force appliquée à la bande auto-adhésive double face.
PCT/JP2018/009458 2017-03-15 2018-03-12 Bande auto-adhésive double face Ceased WO2018168750A1 (fr)

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JP2020132865A (ja) * 2019-02-15 2020-08-31 積水化学工業株式会社 粘着テープ及び表示部材の固定・接合方法
EP3809110A1 (fr) * 2019-10-15 2021-04-21 Lg Chem, Ltd. Appareil d'analyse d'un film adhésif multicouche et procédé associé
CN115420678A (zh) * 2022-08-31 2022-12-02 中国路桥工程有限责任公司 一种硬质沥青界面粘附性的定量测试装置
WO2025163207A1 (fr) * 2024-02-02 2025-08-07 Tesa Se Support constitué de polyuréthane thermoplastique expansé, et ruban adhésif comprenant le support expansé

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