WO2020004056A1 - Bande adhésive sensible à la pression et article - Google Patents

Bande adhésive sensible à la pression et article Download PDF

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Publication number
WO2020004056A1
WO2020004056A1 PCT/JP2019/023444 JP2019023444W WO2020004056A1 WO 2020004056 A1 WO2020004056 A1 WO 2020004056A1 JP 2019023444 W JP2019023444 W JP 2019023444W WO 2020004056 A1 WO2020004056 A1 WO 2020004056A1
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WO
WIPO (PCT)
Prior art keywords
sensitive adhesive
pressure
mass
adhesive tape
base material
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PCT/JP2019/023444
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English (en)
Japanese (ja)
Inventor
由美 鍵山
祐也 北出
佳美 古川
岩崎　剛
綱島　啓次
紳 叢
Original Assignee
Dic株式会社
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Application filed by Dic株式会社 filed Critical Dic株式会社
Priority to CN201980038687.9A priority Critical patent/CN112262192A/zh
Priority to JP2020514635A priority patent/JP6737422B2/ja
Publication of WO2020004056A1 publication Critical patent/WO2020004056A1/fr

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Classifications

    • 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
    • C09J133/04—Homopolymers or copolymers of esters
    • 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
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
    • C09J7/38—Pressure-sensitive adhesives [PSA]

Definitions

  • the present invention relates to an adhesive tape which can be used in the production of various products including electronic devices.
  • Adhesive tapes are widely used in the production of various products such as electronic devices and automobiles.
  • the pressure-sensitive adhesive tape is usually required to be able to maintain excellent adhesive strength over a long period of time without being affected by water, heat, or the like.
  • the adhesive tape used in the production of portable electronic devices that are often touched by humans and in the fixing of automobile interior parts has excellent adhesive strength even when, for example, sweat or sebum adheres. There is a demand for possible, so-called excellent chemical resistance.
  • Examples of the pressure-sensitive adhesive tape having excellent chemical resistance include 50 to 90% by mass of a (meth) acrylic acid alkyl ester (A1) having an alkyl group having 4 to 12 carbon atoms and 3 to 20 of a carboxyl group-containing monomer (A2). % By weight, 3 to 20% by mass of a hydroxyl group-containing monomer (A3) and 3 to 15% by mass of a (meth) acrylic acid alkyl ester (A4) having an alkyl group having 1 to 3 carbon atoms, and A pressure-sensitive adhesive composition comprising an acrylic copolymer (A) having an average molecular weight of 700,000 to 2,000,000 and a theoretical Tg of -40 ° C. or less and having a hydroxy group and a carboxyl group, and a crosslinking agent (B).
  • a pressure-sensitive adhesive tape obtained by using the same is known (for example, see Patent Document 1).
  • the problem to be solved by the present invention is to provide a pressure-sensitive adhesive tape which can maintain excellent adhesive force over a long period of time even when sweat, sebum, etc. adhere, and which has excellent impact resistance and rebound resistance. It is to be.
  • the present inventors have determined that a specific content of a carboxyl group-containing monomer, a specific content of a hydroxyl group-containing monomer, and one or more alkyls having an average number of carbon atoms of less than 4 in other saturated hydrocarbon groups ( (Meth)
  • An acrylate monomer and / or an alicyclic monomer is selected, an acrylic copolymer obtained by combining them, an acrylic pressure-sensitive adhesive containing a specific amount of a crosslinking agent, and a foam base material having a specific foaming density are used. It has been found that the above problem can be solved by using an adhesive tape obtained by the above method.
  • the present invention relates to an adhesive tape having an adhesive layer directly or via another layer on at least one surface of the foam base material, wherein the foam base material has a foam density of 0.25 to 0.1. 75 g / cm 3 , wherein the pressure-sensitive adhesive layer contains an acrylic pressure-sensitive adhesive containing an acrylic copolymer and a crosslinking agent, and the acrylic copolymer is: (A) 2 to 30% by mass of a carboxyl group-containing monomer, (B) a hydroxyl group-containing monomer in an amount of 1.0% by mass or less, and (C) one or more selected from the group consisting of other alkyl (meth) acrylate monomers and alicyclic monomers as constituent components; The average number of carbon atoms of the saturated hydrocarbon group contained in the monomer (C) is less than 4, and the content of the crosslinking agent is 0.2 parts by mass relative to 100 parts by mass of the resin solid content in the acrylic pressure-sensitive adhesive. Parts to 2.5 parts by mass.
  • the pressure-sensitive adhesive tape of the present invention has a good initial adhesive strength, hardly swells even when, for example, sweat or sebum adheres, maintains excellent adhesive strength for a long time, and has excellent impact resistance And has repulsion resistance.
  • the pressure-sensitive adhesive tape of the present invention is a pressure-sensitive adhesive tape having a pressure-sensitive adhesive layer on at least one surface of a foam substrate directly or via another layer, wherein the foam density of the foam substrate is 0.25 to 0. .75 g / cm 3 , wherein the pressure-sensitive adhesive layer contains an acrylic pressure-sensitive adhesive containing an acrylic copolymer and a crosslinking agent, and the acrylic copolymer is: (A) 2 to 30% by mass of a carboxyl group-containing monomer, (B) a hydroxyl group-containing monomer in an amount of 1.0% by mass or less, and (C) one or more selected from the group consisting of other alkyl (meth) acrylate monomers and alicyclic monomers as constituent components; The average number of carbon atoms of the saturated hydrocarbon group contained in the monomer (C) is less than 4, and the content of the crosslinking agent is 0.2 parts by mass relative to 100 parts by mass of the resin solid content in the acrylic pressure-sensitive adhesive. Parts to 2.5 parts
  • Examples of the embodiment of the pressure-sensitive adhesive tape include a pressure-sensitive adhesive tape having the pressure-sensitive adhesive layer directly or via another layer on one or both surfaces of a foam base material.
  • a pressure-sensitive adhesive tape having the pressure-sensitive adhesive layer directly or via another layer on one or both surfaces of a foam base material When used for fixing an adherend, it is preferable to use it in the embodiment of the double-sided pressure-sensitive adhesive tape having a pressure-sensitive adhesive layer on both sides of a substrate.
  • When used for a label or the like it is preferably used in an embodiment of a single-sided pressure-sensitive adhesive tape having a pressure-sensitive adhesive layer on one side of a substrate.
  • the pressure-sensitive adhesive tape of the present invention may be stored in a state where a release film is laminated on the surface of the pressure-sensitive adhesive layer.
  • the thickness of the pressure-sensitive adhesive tape of the present invention has a more excellent durability against sweat and sebum, and has excellent impact resistance and a thickness of 60 ⁇ m or more. It is more preferable to use one having a thickness in the range of 80 ⁇ m to 500 ⁇ m, even more preferably to use one having a thickness in the range of 90 ⁇ m to 400 ⁇ m, and more preferably in the range of 150 ⁇ m to 350 ⁇ m. It is more preferable to use those having.
  • the pressure-sensitive adhesive layer constituting the pressure-sensitive adhesive tape of the present invention has a further excellent durability against sweat, sebum, and the like, and contributes to thinning of electronic devices and the like, in a range of 5 ⁇ m to 100 ⁇ m. It is preferable to use one having a thickness, more preferably one having a thickness in the range of 10 ⁇ m to 90 ⁇ m, and even more preferably one having a thickness in the range of 30 ⁇ m to 80 ⁇ m.
  • the content of the crosslinking agent contained in the acrylic pressure-sensitive adhesive used in the pressure-sensitive adhesive layer is 0.2 to 2.5 parts by mass with respect to 100 parts by mass of the resin solid content in the acrylic pressure-sensitive adhesive.
  • the content is preferably from 0.4 to 2.3 parts by mass, and more preferably from 0.6 to 2.2 parts by mass. More preferably, the content is in the range of 0.9 parts by mass to 1.8 parts by mass.
  • an isocyanate-based crosslinking agent for example, an isocyanate-based crosslinking agent, an epoxy-based crosslinking agent, a metal chelate-based crosslinking agent, an aziridine-based crosslinking agent, and the like can be used.
  • the cross-linking agent it is preferable to use a cross-linking agent which is easy to use by mixing with the previously prepared acrylic copolymer or a solution thereof, and is capable of promptly proceeding a cross-linking reaction, Specifically, it is more preferable to use an isocyanate-based crosslinking agent and an epoxy-based crosslinking agent.
  • isocyanate-based cross-linking agent examples include tolylene diisocyanate, naphthylene-1,5-diisocyanate, hexamethylene diisocyanate, diphenylmethane diisocyanate, xylylene diisocyanate, and trimethylolpropane-modified tolylene diisocyanate. It is preferable to use trimethylolpropane-modified tolylene diisocyanate.
  • acrylic pressure-sensitive adhesive used for the pressure-sensitive adhesive layer (A) 2 to 30% by mass of a carboxyl group-containing monomer, (B) 1.0% by mass or less of a hydroxyl group-containing monomer, and (C) other alkyl (meth)
  • An acrylic copolymer consisting of one or more copolymers selected from the group consisting of acrylate monomers and alicyclic monomers is used as a base polymer, and if necessary, additives such as a tackifier resin and a crosslinking agent. Can be used.
  • Examples of the carboxyl group-containing monomer that can be used in the production of the acrylic copolymer include acrylic acid, methacrylic acid, itaconic acid, maleic acid, (meth) acrylic acid dimer, crotonic acid, ethylene oxide-modified succinic acrylate, and the like. Among them, it is preferable to use acrylic acid as a copolymer component in order to exhibit more excellent durability against sweat, sebum, alcohol, and the like.
  • the content of the carboxyl group-containing monomer is preferably 2 to 30% by mass, more preferably 3 to 20% by mass, based on the total amount of the acrylic monomer used in producing the acrylic copolymer. It is more preferably from 15 to 15% by mass in order to exhibit more excellent durability against sweat, sebum, alcohol and the like.
  • hydroxyl group-containing monomer examples include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, and 6-hydroxyhexyl
  • 2-hydroxyethyl (meth) acrylate examples include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, and 6-hydroxyhexyl
  • a hydroxyl group-containing (meth) acrylate such as (meth) acrylate can be used.
  • the content of the hydroxyl group-containing monomer relative to the total amount of the acrylic monomer that can be used in producing the acrylic copolymer is 1.0% by mass or less, but may be 0.01 to 0.85% by mass. Preferably, it is 0.02 to 0.7% by mass, more preferably 0.03 to 0.5% by mass, even more preferably 0.04 to 0.3% by mass, It is particularly preferred that the content be 0.05 to 0.2% by mass in order to exhibit more excellent durability against sweat, sebum and the like.
  • the alkyl group of the alkyl (meth) acrylate monomer may be linear or branched.
  • Examples of the alkyl (meth) acrylate monomer include methyl (meth) acrylate, ethyl (meth) acrylate, n-butyl (meth) acrylate, isobutyl (meth) acrylate, t-butyl (meth) acrylate, and n-hexyl (meth).
  • a (meth) acrylate monomer having 1 to 12 carbon atoms in the alkyl group it is more preferable to use a (meth) acrylate monomer having 1 to 10 carbon atoms.
  • a (meth) acrylate monomer having 1 to 4 carbon atoms it is easy to adjust the average number of carbon atoms of the alkyl group of the (meth) acrylate monomer to less than 4, which is preferable.
  • the average number of carbon atoms of the saturated hydrocarbon group of one or more selected from the group consisting of the alkyl (meth) acrylate monomers (C) is less than 4, but is preferably 1.0 or more and 3.9 or less. It is more preferably in the range, more preferably in the range of 1.5 to 3.8, more preferably in the range of 2.0 to 3.7, and more preferably 2.5 to 3.6. More preferably, it is within the range. By setting it in the above range, it has a good initial adhesive strength, hardly swells even when sweat, sebum, alcohol or the like adheres, and can maintain excellent adhesive strength for a long period of time.
  • the average number of carbon atoms of the saturated hydrocarbon group of one or more selected from the group consisting of the alkyl (meth) acrylate monomers (C) is determined by the number of carbon atoms of each of the contained saturated hydrocarbon groups.
  • the products of the molar concentrations (mol%) are added to each other, and one or more total moles of one or more selected from the group consisting of all (C) alkyl (meth) acrylate monomers and alicyclic monomers containing the total It is determined by dividing by the concentration (mol%).
  • the average number of carbon atoms is (A ⁇ a + B ⁇ b) / ( a + b).
  • the content of one or more selected from the group consisting of the alkyl (meth) acrylate monomers of (C) is 70% by mass based on the total amount of acrylic monomers that can be used in producing the acrylic copolymer.
  • the content is preferably not less than 79% by mass, more preferably from 79 to 95% by mass, and still more preferably from 84 to 92% by mass.
  • the acrylic copolymer can be obtained by copolymerization by a known polymerization method such as a solution polymerization method, a bulk polymerization method, a suspension polymerization method, and an emulsion polymerization method.
  • the bulk polymerization method is preferred.
  • the polymerization can be initiated by a thermal method using a thermal polymerization initiator such as benzoyl peroxide or lauroyl peroxide, or an azo thermal polymerization initiator such as azobisisobutylnitrile, or acetophenone, benzoin ether, or benzyl.
  • a method of starting by ultraviolet irradiation using a ketal-based, acylphosphine oxide-based, benzoin-based, benzophenone-based photopolymerization initiator, or a method by electron beam irradiation can be arbitrarily selected.
  • the weight average molecular weight in terms of standard polystyrene measured by gel permeation chromatography is preferably 400,000 or more, more preferably 45 to 1.1 million. It is more preferably from 500 to 1,000,000 in order to exhibit more excellent durability against sweat, sebum, alcohol and the like.
  • the measurement of the molecular weight by the GPC method is a standard polystyrene conversion value measured using a GPC apparatus (HLC-8329GPC) manufactured by Tosoh Corporation, and the measurement conditions are as follows.
  • a pressure-sensitive adhesive containing a tackifier resin can be used in order to obtain a pressure-sensitive adhesive sheet having more excellent adhesion.
  • tackifying resin examples include a rosin-based tackifying resin, a polymerized rosin-based tackifying resin, a polymerized rosin-ester-based tackifying resin, a rosin-phenol-based tackifying resin, a stabilized rosin-ester-based tackifying resin, and a disproportionated rosin ester.
  • Tackifier resin, hydrogenated rosin ester tackifier resin, terpene tackifier resin, terpene phenol tackifier resin, petroleum resin tackifier resin, (meth) acrylate resin tackifier resin, etc. can be used. .
  • the softening point of the tackifier resin is not particularly limited, but is 30 to 180 ° C, preferably 40 to 140 ° C.
  • the content of the tackifying resin is from 1 part by mass to 30 parts by mass with respect to 100 parts by mass of the resin solid content in the acrylic pressure-sensitive adhesive, but exhibits more excellent durability against sweat, sebum and the like. In the above, the content is preferably from 2 parts by mass to 25 parts by mass, and more preferably from 3 parts by mass to 20 parts by mass. Further, two or more kinds of the tackifier resins may be used in combination.
  • the pressure-sensitive adhesive layer used in the pressure-sensitive adhesive tape of the present invention preferably has a temperature at which the peak value of the loss tangent (tan ⁇ ) at a frequency of 1 Hz is ⁇ 40 ° C. to 5 ° C.
  • the temperature is more preferably from -30 ° C to 3 ° C, further preferably from -20 ° C to 0 ° C, and most preferably from -15 ° C to -3 ° C.
  • the temperature is preferably from -15 ° C to -4 ° C from the viewpoint of improving the drop impact resistance.
  • a pressure-sensitive adhesive layer formed to a thickness of about 2 mm was measured using a viscoelasticity tester (trade name: ARES @ G2, manufactured by TA Instruments Japan).
  • test piece is sandwiched between parallel disks having a diameter of 8 mm, which is a measuring part, and the storage elastic modulus (G ′) and the loss elastic modulus (G ′′) are measured at a frequency of 1 Hz from ⁇ 50 ° C. to 150 ° C.
  • the adhesive examples include plasticizers, softeners, antioxidants, flame retardants, glass and plastic fibers / balloons, beads, metals, metal oxides, fillers such as metal nitrides, pigments, dyes, and the like. Those containing additives such as a coloring agent, a leveling agent, a thickener, a water repellent, and an antifoaming agent can be used.
  • the pressure-sensitive adhesive it is preferable to use a pressure-sensitive adhesive containing a solvent in order to maintain good coating workability and the like.
  • a solvent for example, toluene, xylene, ethyl acetate, butyl acetate, acetone, methyl ethyl ketone, hexane and the like can be used.
  • water or an aqueous solvent mainly composed of water can be used.
  • the pressure-sensitive adhesive tape of the present invention is a pressure-sensitive adhesive tape provided with the pressure-sensitive adhesive layer on one side or both sides of a foam base material.
  • the pressure-sensitive adhesive tape of the present invention can be manufactured by applying the pressure-sensitive adhesive to one or both surfaces of the foam base material using a knife coater, a roll coater, a die coater, or the like, and drying the pressure-sensitive adhesive. Further, the pressure-sensitive adhesive tape is formed by previously applying the pressure-sensitive adhesive to the surface of the release liner using a knife coater, a roll coater, a die coater, or the like, and drying to form a pressure-sensitive adhesive layer. Can be manufactured by a transfer method in which the resin is bonded to one or both surfaces of a foam base material.
  • a method of drying the pressure-sensitive adhesive composition for example, a method of drying at 50 ° C. to 140 ° C. for 30 seconds to 10 minutes may be mentioned. After the drying, aging may be further performed at a temperature in the range of 30 ° C. to 50 ° C. in order to accelerate the curing reaction.
  • the foam base material preferably has a thickness of 50 ⁇ m to 400 ⁇ m, more preferably 80 ⁇ m to 300 ⁇ m, and more preferably 80 ⁇ m to 200 ⁇ m. By setting the thickness of the foam base material within the above range, it is possible to exhibit suitable adhesive strength and impact resistance to an adherend having an uneven 3D shape and a rough surface.
  • the foam base material preferably has a 25% compressive strength of 20 kPa or more, more preferably 30 kPa to 1000 kPa, and more preferably 120 kPa to 800 kPa. It is more preferable to use one having a pressure of 150 kPa to 700 kPa. By setting the 25% compressive strength in the above range, it is possible to develop a suitable adhesive force to an adherend having an uneven shape, a 3D shape, and a rough surface.
  • the 25% compressive strength was measured according to JIS K6767.
  • the samples cut into 25 squares are overlapped to a thickness of about 10 mm.
  • the sample is sandwiched between stainless steel plates having an area larger than that of the sample, and the strength is measured when the sample is compressed at 2.5 ° C. at 25 ° C. at a speed of 10 mm / min (25% of the original thickness).
  • the foam base material has an interlayer strength of 4 N / cm or more, preferably 6 N / cm to 150 N / cm, more preferably 10 N / cm to 100 N / cm, and more preferably 20 N / cm to 60 N / cm.
  • Body substrates can be used.
  • the foam having the interlayer strength in the above range it is possible to realize good followability to an adherend and excellent impact resistance. Furthermore, in order to improve the yield during the production of portable electronic devices, adhesive tapes and parts are peeled off from work-in-progress (rework), and casings and parts are separated to repair, recycle or reuse finished products. In the case of decomposition and disassembly, even if interlayer cracking of the base material occurs, the adhesive tape can be easily peeled.
  • the interlayer strength is measured by the following method.
  • a 50- ⁇ m-thick pressure-sensitive adhesive layer (one that does not peel off from the adherend and the foam substrate during the high-speed peeling test described below) was attached to both surfaces of the foam base material for evaluating the interlayer strength one by one. Thereafter, the mixture is aged at 40 ° C. for 48 hours to prepare a double-sided pressure-sensitive adhesive tape for measuring interlayer strength.
  • a double-sided pressure-sensitive adhesive tape having a width of 1 cm and a length of 15 cm (flow direction and width direction of the foam base material), which is lined with a 25 ⁇ m-thick polyester film on one side of the pressure-sensitive adhesive film, is applied at 23 ° C. and 50% RH.
  • a 2 kg roller is applied to the polyester film having a thickness of 50 ⁇ m, a width of 3 cm, and a length of 20 cm with one reciprocating pressure and left at 60 ° C. for 48 hours.
  • the side bonded to the polyester film having a thickness of 50 ⁇ m at 23 ° C. and 50% RH was fixed to a mounting jig of a high-speed peeling tester, and the polyester film having a thickness of 25 ⁇ m was pulled at a speed of 15 m.
  • the maximum strength at the time of pulling the foam at 90 degrees in the direction of 90 / min is measured.
  • the tensile modulus of the foam base material in the flow direction and the width direction is not particularly limited, but is preferably 200 N / cm 2 or more, more preferably 300 to 1800 N / cm 2 . Also preferably the tensile modulus of the flow direction and the ones of the widthwise tensile low elasticity modulus direction is 500 ⁇ 800N / cm 2, and more preferably 600 ⁇ 700N / cm 2. At this time, the tensile modulus in the high direction is preferably from 700 to 1800 N / cm 2 , more preferably from 800 to 1600 N / cm 2 .
  • the tensile elongation at the time of cutting in the tensile test is not particularly limited, but the tensile elongation in the flow direction is preferably 200 to 1500%, more preferably 400 to 1000%, and still more preferably 450 to 800%. is there.
  • the foamed base material having the tensile elastic modulus and the tensile elongation within the above ranges can suppress the deterioration of the workability of the pressure-sensitive adhesive tape and the deterioration of the sticking workability even for a foamed and flexible base material.
  • the adhesive tape when the adhesive tape is peeled off, interlayer destruction and creaking of the foam hardly occur, and even when interlayer cracking occurs, the adhesive tape can be easily peeled off.
  • the tensile modulus of the foam base material in the flow direction and the width direction was measured according to JIS K6767. This is the maximum strength measured on a sample having a marked line length of 2 cm and a width of 1 cm using a Tensilon tensile tester under an environment of 23 ° C. and 50% RH at a tensile speed of 300 mm / min.
  • the cell structure of the foam base material is preferably a closed cell structure because water from a cut surface of the foam base material can be effectively prevented.
  • the shape of the cells that form the closed-cell structure follows the average cell diameter in the flow direction and / or the width direction longer than the average cell diameter in the thickness direction of the foam. It is preferable because it has properties and cushioning properties.
  • the foam base material has an average cell diameter in the flow direction and the width direction of 1.2 to 700 ⁇ m, preferably 10 to 500 ⁇ m, more preferably 30 to 300 ⁇ m, and still more preferably 50 to 200 ⁇ m.
  • the average cell diameter in the thickness direction of the foam substrate depends on the thickness of the foam substrate, but is preferably 1 to 150 ⁇ m, more preferably 5 to 100 ⁇ m, and more preferably 10 to 60 ⁇ m.
  • the ratio of the average cell diameter in the flow direction of the foam substrate to the average cell diameter in the thickness direction of the foam substrate (average cell diameter in the flow direction / average cell diameter in the thickness direction) of the foam base; And the ratio of the average cell diameter in the width direction of the foam substrate to the average cell diameter in the thickness direction of the foam substrate (average cell diameter in the width direction / average cell diameter in the thickness direction) is both 1.2 to 1.2. It is 15 or less, more preferably 1.2 to 10, further preferably 2 to 8. When the ratio is 1.2 or more, flexibility in the thickness direction is easily ensured, so that followability is improved. Further, when the ratio is 15 times or less, the durability against foam interlayer destruction at the time of a drop impact is dramatically improved.
  • the flexibility and the tensile strength in the flow direction and the width direction of the foam base material hardly vary. Since the pressure-sensitive adhesive tape using the foam base material having the ratio of the average cell diameter has a suitable followability and cushioning property in the thickness direction, the pressure at the time of application is concentrated on the bonding portion and exists at the bonding interface. Since it is easy to extrude the air, it is possible to realize excellent adhesion that does not cause a gap into which water enters even in joining rigid bodies.
  • the ratio of the average bubble diameter in the flow direction and the average bubble diameter in the width direction is not particularly limited, but is preferably 0.25 to 4 times, more preferably 0.33 to 3 times, and still more preferably 0.1 to 3 times when the flow direction is 1.
  • the ratio is 6 to 1.5 times, particularly preferably 0.7 to 1.3 times.
  • the average cell diameter in the width direction, the flow direction, and the thickness direction of the foam base material is measured in the following manner.
  • the foam base material is cut into about 1 cm in both the width direction and the flow direction.
  • the foam digital microscope the cut surface of a substrate (trade name "KH-7700", manufactured by HiROX Co.) After enlarged 200 times, the imaging width direction or flow direction of the switching section of the foam substrate did.
  • the obtained enlarged image all the bubble diameters of the bubbles existing on the cut surface having an actual length of 2 mm before the enlargement in the flow direction or the width direction are measured, and the average bubble diameter is calculated from the average value.
  • the average bubble diameter was determined from the results measured at arbitrary 10 locations.
  • the apparent density of the foam base material is not particularly limited, but it is easy to adjust the interlayer strength, the compressive strength, the average cell diameter, and the like to the above ranges to easily achieve both impact resistance and excellent adhesion with the adherend. From 0.25 to 0.75 g / cm 3 , preferably 0.3 to 0.7 g / cm 3 , more preferably 0.35 to 0.6 g / cm 3 , and still more preferably 0.40 to 0.55 g / Cm 3 .
  • the apparent density was measured according to JIS K6767. A foam base material cut into a rectangle of 4 cm ⁇ 5 cm is prepared for about 15 cm 3 minutes, and its mass is measured to determine the apparent density.
  • the interlayer strength, compressive strength, tensile modulus, and the like of the foam base material can be appropriately adjusted depending on the base material used and the foam structure.
  • the type of foam base material used in the present invention is not particularly limited as long as it has the above-mentioned interlayer strength, 25% compressive strength, tensile modulus, etc., but polyethylene, polypropylene, ethylene-propylene copolymer, ethylene- Polyolefin foams such as vinyl acetate copolymers and polyurethane foams, rubber foams such as acrylic rubber and other elastomers, and the like can be used.
  • a polyolefin foam can be preferably used since a foam base material having a thin closed cell structure excellent in buffer absorption and the like can be easily produced.
  • polyethylene-based resin is preferable because it can be easily produced with a uniform thickness and can easily impart suitable flexibility.
  • the content of the polyethylene resin in the polyolefin resin is preferably 40% by mass or more, more preferably 50% by mass or more, still more preferably 60% by mass or more, and more preferably 100% by mass. Is particularly preferred.
  • the polyethylene resin used for the polyolefin foam a polyethylene resin obtained by using a metallocene compound containing a tetravalent transition metal as a polymerization catalyst, the molecular weight distribution is narrow, in the case of a copolymer, Since the copolymer component is introduced into each of the molecular weight components at a substantially equal ratio, the polyolefin-based foam can be uniformly crosslinked. For this reason, since the foamed sheet is uniformly crosslinked, the foamed sheet can be easily stretched as required, and the thickness of the resulting polyolefin resin foam can be easily made uniform overall, which is preferable.
  • the polyolefin resin constituting the polyolefin foam may contain a polyolefin resin other than the polyethylene resin obtained using a metallocene compound containing a tetravalent transition metal as a polymerization catalyst.
  • a polyolefin-based resin examples include a polyethylene-based resin and a polypropylene-based resin other than those described above.
  • the polyolefin resins may be used alone or in combination of two or more.
  • Such polyethylene resins include, for example, linear low-density polyethylene, low-density polyethylene, medium-density polyethylene, high-density polyethylene, ethylene- ⁇ -olefin copolymer containing 50% by weight or more of ethylene, and 50% ethylene.
  • Examples thereof include ethylene-vinyl acetate copolymers containing at least 1% by weight, and these may be used alone or in combination of two or more.
  • Examples of the ⁇ -olefin constituting the ethylene- ⁇ -olefin copolymer include propylene, 1-butene, 1-pentene, 4-methyl-1-pentene, 1-hexene, 1-heptene and 1-octene. No.
  • the polypropylene-based resin is not particularly limited, and includes, for example, polypropylene and a propylene- ⁇ -olefin copolymer containing 50% by weight or more of propylene.
  • the above may be used in combination.
  • Examples of the ⁇ -olefin constituting the propylene- ⁇ -olefin copolymer include ethylene, 1-butene, 1-pentene, 4-methyl-1-pentene, 1-hexene, 1-heptene and 1-octene. No.
  • the polyolefin-based foam may be crosslinked, but is preferably crosslinked when the expandable polyolefin-based resin sheet is foamed with a pyrolytic foaming agent.
  • the method for producing the polyolefin-based resin foam is not particularly limited.
  • a polyolefin-based resin containing 40% by weight or more of a polyethylene-based resin obtained by using a metallocene compound containing a tetravalent transition metal as a polymerization catalyst A foamable polyolefin-based resin composition containing a pyrolytic foaming agent, a foaming aid, and a colorant for coloring a foam to black or white is supplied to an extruder, melt-kneaded, and formed into a sheet form from the extruder.
  • a foamable polyolefin-based resin sheet by extruding the foamed polyolefin-based resin sheet, cross-linking the foamable polyolefin-based resin sheet, foaming the foamable polyolefin-based resin sheet, and melting or melting the obtained foamed sheet.
  • Softening and stretching in either the flow direction or the width direction or both directions to stretch the foamed sheet And a method of containing.
  • the step of stretching the foam sheet may be performed as needed, and may be performed a plurality of times.
  • a method of crosslinking the polyolefin-based resin foam base material for example, a method of irradiating the foamable polyolefin-based resin sheet with ionizing radiation, and a method in which an organic peroxide is previously blended into the foamable polyolefin-based resin composition And a method of heating the obtained foamable polyolefin-based resin sheet to decompose the organic peroxide. These methods may be used in combination.
  • Ionizing radiation includes electron beam, ⁇ -ray, ⁇ -ray, ⁇ -ray and the like.
  • the dose of the ionizing radiation is appropriately adjusted so that the gel fraction of the polyolefin-based resin foam base material falls within the above-mentioned preferable range, but is preferably in the range of 5 to 200 kGy.
  • Irradiation with ionizing radiation is preferably performed on both surfaces of the expandable polyolefin-based resin sheet, since it is easy to obtain a uniform foaming state, and it is more preferable to irradiate both surfaces with the same dose.
  • organic peroxide examples include 1,1-bis (t-butylperoxy) 3,3,5-trimethylcyclohexane, 1,1-bis (t-butylperoxy) cyclohexane, and 2,2-bis ( (t-butylperoxy) octane, n-butyl-4,4-bis (t-butylperoxy) valerate, di-t-butyl peroxide, t-butylcumyl peroxide, dicumyl peroxide, ⁇ , ⁇ ′ -Bis (t-butylperoxy-m-isopropyl) benzene, 2,5-dimethyl-2,5-di (t-butylperoxy) hexane, 2,5-dimethyl-2,5-di (t-butyl Peroxy) hexyne-3, benzoyl peroxide, cumyl peroxy neodecaneate, t-butyl peroxybenzoate,
  • the amount of the organic peroxide to be added is preferably 0.01 to 5 parts by mass, more preferably 0.1 to 3 parts by mass, per 100 parts by mass of the polyolefin resin.
  • the amount of the pyrolytic foaming agent in the foamable polyolefin-based resin composition may be appropriately determined according to the expansion ratio of the polyolefin-based resin foam base material. Parts by mass to 40 parts by mass is preferable, and 1 to 30 parts by mass is more preferable.
  • the method for foaming the expandable polyolefin resin sheet is not particularly limited, and examples thereof include a method of heating with hot air, a method of heating with infrared rays, a method of using a salt bath, a method of using an oil bath, and the like. May be used in combination. Among them, a method of heating with hot air and a method of heating with infrared rays are preferable because there is little difference between the front and back of the appearance of the surface of the polyolefin resin foam base material.
  • the stretching of the foamed base material may be performed after the foamable polyolefin-based resin sheet is foamed to obtain a foamed base material, or may be performed while foaming the foamable polyolefin-based resin sheet. .
  • the foam base when the foam base is stretched after foaming the foamable polyolefin resin sheet to obtain the foam base, the molten state during foaming is maintained without cooling the foam base. Subsequently, the foam base material may be stretched, or after the foam base material is cooled, the foam sheet may be heated again to be in a molten or softened state, and then the foam base material may be stretched.
  • the molten state of the foam base material means a state in which the foam base material is heated to a temperature equal to or higher than the melting point of the polyolefin resin constituting the foam base material.
  • the softening of the foam base refers to a state in which the foam base is heated to a temperature from the softening point to the melting point of the polyolefin resin constituting the foam base and lower than the melting point.
  • the elongated foamable polyolefin-based resin sheet is stretched in the flow direction or the width direction, or in the flow direction and the width direction.
  • the foam base material may be simultaneously stretched in the flow direction and the width direction, or may be separately stretched in each direction.
  • a longer foamed polyolefin resin sheet is supplied to the foaming step at a speed (supply speed), and the longer foamed sheet after foaming is used.
  • a method of stretching the foam base material in the flow direction by increasing the speed at which the body base material is wound (winding speed) is exemplified.
  • the expandable polyolefin-based resin sheet expands in the flow direction due to its own foaming, when the foam base material is stretched in the flow direction, the foamable polyolefin-based resin sheet is expanded.
  • the width direction both end portions of the foam base material are gripped by a pair of grip members, and the pair of grip members are gradually moved in a direction away from each other.
  • a preferred method is to stretch the foam base material in the width direction. Since the expandable polyolefin resin sheet expands in the width direction due to its own foaming, when the foam base material is stretched in the width direction, the expandable polyolefin resin sheet expands in the width direction due to foaming. In consideration of the amount, it is necessary to make adjustments so that the foam base material is stretched in the width direction more than the expansion amount.
  • the stretching ratio in the flow direction of the polyolefin foam is preferably 1.1 to 2.0 times, more preferably 1.2 to 1.5 times. Further, the stretching ratio in the width direction of the polyolefin-based foam base material is preferably 1.2 times to 4.5 times, and more preferably 1.5 times to 3.5 times.
  • the foam base material may be colored in the pressure-sensitive adhesive tape in order to exhibit design properties, light-shielding properties, hiding properties, light reflectivity, and light resistance.
  • the coloring agents can be used alone or in combination of two or more.
  • the foam base material is colored black.
  • Black colorants include carbon black, graphite, copper oxide, manganese dioxide, aniline black, perylene black, titanium black, cyanine black, activated carbon, ferrite, magnetite, chromium oxide, iron oxide, molybdenum disulfide, chromium complex, and complex oxide.
  • the foam base is colored white.
  • white colorants include titanium oxide, zinc oxide, aluminum oxide, silicon oxide, magnesium oxide, zirconium oxide, calcium oxide, tin oxide, barium oxide, cesium oxide, yttrium oxide, magnesium carbonate, calcium carbonate, barium carbonate, and zinc carbonate.
  • aluminum oxide and zinc oxide are preferred from the viewpoint of cost, availability, color tone, and heat resistance to withstand the temperature of the step of extruding the foamable polyolefin-based resin composition or the step of heating and foaming.
  • the foamable polyolefin-based resin composition may further include a plasticizer, an antioxidant, a foaming aid such as zinc oxide, a foam nucleus adjusting material, if necessary, as long as the physical properties of the polyolefin-based resin foam substrate are not impaired.
  • a plasticizer such as polyethylene glycol dimethacrylate, polyethylene glycol dimethacrylate, polypropylene glycol dimethacrylate, polyethylene glycol dimethacrylate, polyethylene glycol dimethacrylate, polyethylene glycol dimethacrylate, polyethylene glycol dimethacrylate, polyethylene glycol dimethacrylate, polyethylene glycol dimethacrylate, polyethylene glycol dimethacrylate, polyethylene glycol dimethacrylate, polyethylene glycol dimethacrylate, polyethylene glycol dimethacrylate, polyethylene glycol dimethacrylate, polypropylene glycol dimethacrylate, polypropylene glycol dimethacrylate, polypropylene glycol dimethacrylate
  • the polyolefin-based resin foam base material used in the pressure-sensitive adhesive sheet of the present invention is preferably 0.1% by mass to 10% by mass with respect to the polyolefin-based resin in order to maintain appropriate followability and cushioning properties. % To 7% by mass is preferred.
  • the coloring agent, the thermally decomposable foaming agent, the foaming aid and the like are blended in the foamable polyolefin-based resin composition, they are supplied to an extruder from the viewpoint of preventing color unevenness and partial excessive foaming or insufficient foaming. It is preferable to form a masterbatch with a foamable polyolefin-based resin composition or a thermoplastic resin having high compatibility with the foamable polyolefin-based resin composition beforehand.
  • the foam base material should be subjected to surface treatment such as corona treatment, flame treatment, plasma treatment, hot air treatment, ozone / ultraviolet light treatment, and application of an easy adhesion treatment agent in order to improve the adhesion with the pressure-sensitive adhesive layer and other layers. It may be done.
  • surface treatment when the wetting index by the wetting reagent is 36 mN / m or more, preferably 40 mN / m, and more preferably 48 mN / m, good adhesion to the pressure-sensitive adhesive can be obtained.
  • the foam base material having improved adhesion may be bonded to the pressure-sensitive adhesive layer in a continuous process, or may be once wound up.
  • the foam base material When the foam base material is wound up once, the foam base material is wound together with paper or a paper such as a film of polyethylene, polypropylene, or polyester to prevent a blocking phenomenon between the foam base materials having increased adhesion. It is preferable to use a polypropylene film or a polyester film having a thickness of 25 ⁇ m or less.
  • a method for producing the pressure-sensitive adhesive tape of the present invention a method (direct method) in which the pressure-sensitive adhesive composition is applied to one or both surfaces of a foam base material and dried or the like, or a surface of a release liner
  • the pressure-sensitive adhesive tape of the present invention has a good initial adhesive strength, hardly swells even when, for example, sweat or sebum adheres, maintains excellent adhesive strength for a long time, and has excellent impact resistance
  • the pressure-sensitive adhesive composition (P-2) was obtained by mixing 1.3 parts by mass of the crosslinking agent resin solids with 100 parts by mass of the resin solids in the acrylic copolymer (A-1). Was.
  • the pressure-sensitive adhesive composition (P-7) was mixed with the acrylic copolymer (A-1) solution by blending D-40 with 1.2 parts by mass of a crosslinking agent resin solids with respect to 100 parts by mass of the resin solids. Obtained.
  • Example 1 The pressure-sensitive adhesive composition (P-1) obtained in Preparation Example 1 was applied to the release-treated surface of a release liner (a 75 ⁇ m-thick polyethylene terephthalate film having a release treatment on one side) and the thickness of the dried pressure-sensitive adhesive layer. was applied so as to be 40 ⁇ m, and dried at 100 ° C. for 3 minutes to produce two pressure-sensitive adhesive layers having a thickness of 40 ⁇ m.
  • a release liner a 75 ⁇ m-thick polyethylene terephthalate film having a release treatment on one side
  • the polyolefin foam (1) (thickness: 170 ⁇ m, density: 0.45 g / cm 3 , 25% compressive strength: 419 kPa, manufactured by Sekisui Chemical Co., Ltd., surface wettability index by corona treatment)
  • the pressure-sensitive adhesive layer having a thickness of 40 ⁇ m was attached to both surfaces of the release liner, and laminated from the upper surface of the release liner with a roll having a linear pressure of 5 kg / cm. Thereafter, the mixture was aged in a 40 ° C. environment for 48 hours to obtain a 250 ⁇ m-thick double-sided pressure-sensitive adhesive tape (T-1).
  • Example 2 A 250 ⁇ m thick double-sided pressure-sensitive adhesive tape (T-2) was obtained in the same manner as in Example 1, except that the pressure-sensitive adhesive composition (P-2) was used instead of the pressure-sensitive adhesive composition (P-1). .
  • Example 3 The pressure-sensitive adhesive composition (P-3) was used in place of the pressure-sensitive adhesive composition (P-1), and the polyolefin-based foam (2) (thickness: 140 ⁇ m, density: 0.1 ⁇ m) was used in place of the polyolefin-based foam (1). 44 g / cm 3 , 25% compressive strength: 301 kPa, manufactured by Sekisui Chemical Co., Ltd., the surface of which is made to have a wetting index of 54 mN / m by corona treatment) except that the above-mentioned adhesive layer having a thickness of 55 ⁇ m is attached to both surfaces. In the same manner as in Example 1, a double-sided pressure-sensitive adhesive tape (T-3) having a thickness of 250 ⁇ m was obtained.
  • Example 4 A 250 ⁇ m thick double-sided pressure-sensitive adhesive tape (T-4) was obtained in the same manner as in Example 3, except that the pressure-sensitive adhesive composition (P-4) was used instead of the pressure-sensitive adhesive composition (P-3). .
  • Example 5 A 250 ⁇ m thick double-sided pressure-sensitive adhesive tape (T-5) was obtained in the same manner as in Example 3, except that the pressure-sensitive adhesive composition (P-5) was used instead of the pressure-sensitive adhesive composition (P-3). .
  • Example 6 A 250 ⁇ m thick double-sided pressure-sensitive adhesive tape (T-6) was obtained in the same manner as in Example 3, except that the pressure-sensitive adhesive composition (P-6) was used instead of the pressure-sensitive adhesive composition (P-3). .
  • Example 7 The pressure-sensitive adhesive composition (P-3) obtained in Preparation Example 3 was replaced with a polyolefin foam (3) (thickness: 100 ⁇ m, density: 0.54 g / cm 3 , 25% compression) instead of the polyolefin foam (2). (Strength: 638 kPa, manufactured by Sekisui Chemical Co., Ltd., surface of which is adjusted to a wetting index of 54 mN / m by corona treatment) The same method as in Example 3 except that the adhesive layer having a thickness of 75 ⁇ m is attached to both surfaces. As a result, a double-sided pressure-sensitive adhesive tape (T-7) having a thickness of 250 ⁇ m was obtained.
  • Example 8 A 250 ⁇ m-thick double-sided pressure-sensitive adhesive tape (T-8) was obtained in the same manner as in Example 7, except that the pressure-sensitive adhesive composition (P-4) was used instead of the pressure-sensitive adhesive composition (P-3). .
  • Example 9 A 250 ⁇ m thick double-sided pressure-sensitive adhesive tape (T-9) was obtained in the same manner as in Example 7, except that the pressure-sensitive adhesive composition (P-5) was used instead of the pressure-sensitive adhesive composition (P-3). .
  • Example 10 A 250 ⁇ m thick double-sided pressure-sensitive adhesive tape (T-10) was obtained in the same manner as in Example 7, except that the pressure-sensitive adhesive composition (P-6) was used instead of the pressure-sensitive adhesive composition (P-3). .
  • Example 11 A 250 ⁇ m thick double-sided pressure-sensitive adhesive tape (T-11) was obtained in the same manner as in Example 7, except that the pressure-sensitive adhesive composition (P-7) was used instead of the pressure-sensitive adhesive composition (P-3). .
  • Example 12 A 250 ⁇ m thick double-sided pressure-sensitive adhesive tape (T-12) was obtained in the same manner as in Example 1, except that the pressure-sensitive adhesive composition (P-8) was used instead of the pressure-sensitive adhesive composition (P-1). .
  • the acrylic polymer (B-1) solution was mixed with 5 parts by mass of a polymerized rosin ester “Haritac PCJ” manufactured by Harima Chemicals, Inc. and 15 parts by mass of an aromatic hydrocarbon resin “FTR6125” manufactured by Mitsui Chemicals, Inc. Further, 1.3 parts by mass of a crosslinking agent resin solid content was mixed with 100 parts by mass of the resin solid content to obtain a pressure-sensitive adhesive composition (Q-1).
  • “Comparative adjustment example 2” In a reaction vessel equipped with a stirrer, a reflux condenser, a nitrogen inlet tube, and a thermometer, 89.9 parts by mass of n-butyl acrylate, 10 parts by mass of acrylic acid, 0.1 part by mass of 4-hydroxybutyl acrylate, and ethyl acetate 200 parts by mass were charged, and the mixture was held at 72 ° C. for 4 hours with stirring, and then held at 75 ° C. for 5 hours.
  • the pressure-sensitive adhesive composition (Q-3) was obtained by adding 1.0 part by mass of the crosslinker resin solids to 100 parts by mass of the resin solids in the acrylic copolymer (B-2) solution.
  • the mixture was diluted with 98 parts by mass of ethyl acetate and filtered through a 200-mesh wire gauze to obtain an acrylic resin having a weight average molecular weight of 870,000 and a saturated hydrocarbon group of an alkyl acrylate monomer having an average carbon atom number of 2.54.
  • a polymer (B-3) solution was obtained.
  • a pressure-sensitive adhesive composition (Q-4) was obtained by adding 1.2 parts by mass of a crosslinking agent resin solids to 100 parts by mass of the resin solids in the acrylic copolymer (B-3) solution.
  • a pressure-sensitive adhesive composition (Q-5) was obtained by mixing 0.11 part by mass of a crosslinking agent resin solid content with respect to 100 parts by mass of the resin solid content in the acrylic copolymer (A-2) solution.
  • a pressure-sensitive adhesive composition (Q-6) was obtained by mixing 3.1 parts by mass of the crosslinking agent resin solids with 100 parts by mass of the resin solids in the acrylic copolymer (A-2) solution.
  • the adhesive layer having a thickness of 25 ⁇ m was attached to both surfaces of the polyolefin-based foam (1) used in Example 1, and a linear pressure of 5 kg / cm was applied from the upper surface of the release liner. Laminated with a roll of cm. Thereafter, the resultant was aged in a 40 ° C. environment for 48 hours to obtain a 250 ⁇ m-thick double-sided adhesive tape (U-1).
  • the double-sided pressure-sensitive adhesive tape obtained in each of Examples and Comparative Examples was cut into 18.5 mm square and 2 mm in width, and was released from one side of the double-sided pressure-sensitive adhesive tape under an environment of a temperature of 23 ° C. and a relative humidity of 50% RH.
  • the liner was peeled off, and one piece of the pressure-sensitive adhesive tape was attached to a 3 mm-thick, 20 mm square soda glass plate (hue: colorless and transparent).
  • the patch was left in an atmosphere of 23 ° C. and 50% RH for 24 hours, and then left in an atmosphere of 60 ° C. and 90% RH for 24 hours. Then, it was left at 23 ° C. and 50% RH for 24 hours.
  • the glass plate was pressed at a speed of 5 mm / min with a probe having a diameter of 7 mm from the back surface of the polycarbonate plate of the affixed product, and the peeling strength (G1) of the glass plate was measured.
  • Adhesive strength retention was calculated from the push strength obtained by the push strength measurement and the oil resistance evaluation.
  • Adhesive strength retention (%) (G2 / G1) ⁇ 100
  • the double-sided pressure-sensitive adhesive tape was cut into a rectangular shape having a width of 20 mm and a length of 150 mm, the release liner on one side of the test piece was peeled off, and affixed to an aluminum plate having a width of 20 mm, a length of 150 mm, and a thickness of 0.5 mm.
  • the release liner on the other side was peeled off, bonded to a polycarbonate plate having a width of 25 mm, a length of 200 mm, and a thickness of 2 mm, pressed three times with a 2 kg roller, and allowed to stand at 23 ° C. and 50% RH for 2 hours. did.
  • test piece was bent and fixed so as to have a length of 200 mm to 193 mm, and was observed after standing at 70 ° C. for 24 hours.
  • Average number of carbon atoms Average number of carbon atoms in the saturated hydrocarbon group of the alkyl (meth) acrylate monomer used
  • Examples 1 to 12 of the present invention have good properties in all of the initial adhesive strength, oil resistance, impact resistance and rebound resistance.
  • Comparative Examples 1 to 8 are inferior in one or more of the above characteristics.

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

Abstract

La présente invention concerne le problème consistant à fournir une bande adhésive sensible à la pression qui peut conserver un excellent pouvoir adhésif sur une longue durée même dans les cas où de la sueur, du sébum, et similaires, ont adhéré à la bande, et qui fait preuve d'une excellente résistance aux chocs et résistance à la répulsion. La présente invention concerne une bande adhésive sensible à la pression de mousse qui présente une densité spécifique de mousse, une couche adhésive sensible à la pression contenant un adhésif acrylique sensible à la pression contenant un copolymère acrylique et une teneur spécifique d'un agent de réticulation. Le copolymère acrylique contient une teneur spécifique (A) d'un monomère contenant un groupe carboxyle, (B) d'un monomère contenant le groupe hydroxyle et (C) d'un autre monomère de (méth)acrylate d'alkyle comme constituants constitutifs. Le nombre moyen d'atomes de carbone dans un groupe hydrocarbure saturé dans le monomère (C) est inférieur à 4.
PCT/JP2019/023444 2018-06-28 2019-06-13 Bande adhésive sensible à la pression et article WO2020004056A1 (fr)

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