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WO2018116844A1 - Bande adhésive sensible à la pression - Google Patents

Bande adhésive sensible à la pression Download PDF

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Publication number
WO2018116844A1
WO2018116844A1 PCT/JP2017/043959 JP2017043959W WO2018116844A1 WO 2018116844 A1 WO2018116844 A1 WO 2018116844A1 JP 2017043959 W JP2017043959 W JP 2017043959W WO 2018116844 A1 WO2018116844 A1 WO 2018116844A1
Authority
WO
WIPO (PCT)
Prior art keywords
pressure
sensitive adhesive
adhesive tape
foam
mass
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/JP2017/043959
Other languages
English (en)
Japanese (ja)
Inventor
智 古川
秀晃 武井
啓之 中島
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.)
DIC Corp
Original Assignee
DIC Corp
Dainippon Ink and Chemicals 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 DIC Corp, Dainippon Ink and Chemicals Co Ltd filed Critical DIC Corp
Priority to JP2018557663A priority Critical patent/JPWO2018116844A1/ja
Publication of WO2018116844A1 publication Critical patent/WO2018116844A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/36—After-treatment
    • C08J9/40—Impregnation
    • C08J9/42—Impregnation with 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
    • 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

Definitions

  • the present invention relates to an adhesive tape that can be used for fixing parts constituting various electronic devices including the mobile field and the automobile field.
  • the adhesive tape is used for fixing components constituting various electronic devices including the mobile field and the automobile field.
  • the adhesive tape is a manufacturing scene of the electronic device
  • the adhesive tape is used for applications such as fixing two or more casings constituting the electronic device.
  • a foam-based adhesive tape is used that has an appropriate cushioning property in the thickness direction of the tape, appropriately follows in the joining of rigid bodies, and has a feature that the joining component and the adhesive layer are easily adhered to each other.
  • Patent Document 1 a foam-based adhesive tape having excellent flexibility using, for example, polyethylene resin or urethane resin has been used.
  • the pressure-sensitive adhesive tape used in the above-mentioned application is a foam-based pressure-sensitive adhesive tape that is flexible and can follow, and can maintain its form even when exposed to a high temperature environment, and even when it is returned to room temperature.
  • a foam-based adhesive tape that can maintain the physical properties of the foam is required, it has not been found yet.
  • the problem to be solved by the present invention is excellent in sticking property and followability when sticking to a member, can maintain its form even when exposed to a high temperature environment, and can maintain its original physical properties even when it is returned to room temperature. It is to provide such a foam-based adhesive tape.
  • the present invention is a pressure-sensitive adhesive tape having a pressure-sensitive adhesive layer on at least one surface side of a foam base material, wherein the foam base material has a 25% compressive strength of 20 to 170 kPa and an elongation of 100 at 23 ° C.
  • the ratio E2 / E1 is 0.1 or more when the tensile modulus of elasticity in the flow direction is% E1 and the tensile modulus of elasticity in the flow direction of 100% elongation at 120 ° C. is E2, or the elongation at 23 ° C.
  • the ratio E2 ′ / E1 ′ is 0.1 or more when the tensile modulus in the width direction at a degree of 100% is E1 ′ and the tensile modulus in the width direction at an elongation of 100% at 120 ° C. is E2 ′. It is related with the adhesive tape characterized by these.
  • the pressure-sensitive adhesive tape of the present invention has adhesion and followability when bonded to an adherend, can maintain its form even when exposed to a high temperature environment, and can maintain its original physical properties even when it is returned to room temperature. Therefore, it can be suitably used for fixing two or more housings constituting an electronic device such as a mobile terminal or an automobile.
  • the pressure-sensitive adhesive tape of the present invention is a pressure-sensitive adhesive tape used for fixing components constituting an electronic device, and has a pressure-sensitive adhesive layer on at least one surface side of a foam substrate, and the foam base
  • E1 the tensile modulus in the flow direction at 100% elongation at 23 ° C.
  • E2 / E1 is 0.1 or more
  • E1 ′ the tensile modulus in the width direction at an elongation of 100% at 120 ° C.
  • the ratio E2 ′ / E1 ′ when “is” is 0.1 or more.
  • a foam base material is used as the base material constituting the pressure-sensitive adhesive tape of the present invention.
  • the foam substrate those having a 25% compressive strength of 20 to 170 kPa are used, but those having 30 to 140 kPa are more preferable, and those having 40 to 120 kPa are used. It is further preferable in terms of expressing suitable followability for an adherend having an uneven shape or a rough surface.
  • the tensile elastic modulus in the flow direction and the width direction of the foam base material is not particularly limited, but the tensile elastic modulus in the flow direction at an elongation of 100% at 23 ° C. is E1, and the flow direction at an elongation of 100% at 120 ° C. It is necessary that the ratio E2 / E1 is 0.1 or more when the tensile elastic modulus of E2 is E2, or the tensile elastic modulus in the width direction at an elongation of 100% at 23 ° C. is E1 ′, and 120 ° C. When the tensile modulus in the width direction at 100% elongation is E2 ′, the ratio E2 ′ / E1 ′ needs to be 0.1 or more.
  • the ratio E2 / E1 or E2 ′ / E1 ′ is preferably 0.15 or more, and 0.2 or more can maintain the form of the foam substrate even when exposed to a high temperature environment. It is preferable in that the physical properties after being exposed to the environment can be maintained.
  • the ratio E2 / E1 or 2 '/ E1' is preferably 1.0 or less.
  • the tensile modulus E1 in the flow direction or the tensile modulus E1 ′ in the width direction at an elongation of 100% at 23 ° C. is preferably 50 to 400 N / cm 2 , 50 to 350, and more preferably 50 to 250.
  • the tensile modulus E2 in the flow direction or the tensile modulus E2 ′ in the width direction at an elongation of 100% at 120 ° C. is preferably 5 to 400, more preferably 10 to 250, and preferably 15 to 200.
  • the ratio Eh / El between the tensile modulus El in the low tensile modulus and the tensile modulus Eh in the high direction among the tensile modulus in the flow direction and the width direction at the same temperature is 1.0 to 3.0. In view of providing workability and dimensional stability, 1.0 to 2.0 is preferable.
  • the tensile elasticity modulus of the above-mentioned foam base material was measured according to JISK6767. Using a Tensilon tensile tester, a sample with a marked line length of 2 cm and a width of 1 cm was measured at a tensile modulus of 100% elongation measured at a tensile speed of 300 mm / min in an environment of 23 ° C. or 120 ° C. is there.
  • the maximum tensile elastic modulus of the foam base material in the flow direction and the width direction is not particularly limited, but the maximum tensile elastic modulus at 23 ° C. is preferably 50 to 450 N / cm 2 , more preferably When it is 70 to 400 N / cm 2 , deterioration of the workability of the pressure-sensitive adhesive tape and deterioration of the workability of applying can be suppressed even with a foamed flexible base material. Moreover, when peeling an adhesive tape, it is hard to generate
  • the ratio Eh / El between the tensile modulus El in the low tensile modulus and the tensile modulus Eh in the high direction among the maximum tensile modulus in the flow direction and the width direction at 23 ° C. is 1.0 to 3.0. In view of imparting workability and dimensional stability, 1.0 to 2.0 is preferable.
  • the maximum tensile elastic modulus in the flow direction and the width direction of the foam substrate is not particularly limited, but the maximum tensile elastic modulus in the flow direction or the width direction at 120 ° C. is 15 to 450 N / cm 2 or more, respectively. More preferably, it is 15 to 400 N / cm 2 or more, so that the form of the foam substrate can be maintained even when exposed to a high temperature environment, and the physical properties after being exposed to the high temperature environment can be maintained. In addition, it is preferable. Further, the ratio Eh / El between the tensile modulus El in the low tensile modulus and the tensile modulus Eh in the high direction among the maximum tensile modulus in the flow direction and the width direction at 120 ° C. is 1.0 to 3.0. In view of imparting workability and dimensional stability, 1.0 to 2.0 is preferable.
  • 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 10 N / cm to 60 N / cm.
  • Use of the body substrate can realize good pastability and followability to the adherend and excellent adhesion.
  • the interlayer strength is measured by the following method.
  • a pressure-sensitive adhesive layer having a thickness of 50 ⁇ m (which does not peel off from the adherend and the foam substrate during the following high-speed peel test) was bonded to both surfaces of the foam base material for evaluating the interlayer strength one by one. Thereafter, aging is carried out at 40 ° C. for 48 hours to prepare an adhesive tape for measuring interlayer strength.
  • a pressure-sensitive adhesive tape having a width of 1 cm and a length of 15 cm (in the flow direction and width direction of the foam base material) lined with a polyester film having a thickness of 25 ⁇ m on one side is thickened at 23 ° C. and 50% RH.
  • a polyester film having a thickness of 50 ⁇ m, a width of 3 cm, and a length of 20 cm is pressure-applied with one reciprocation of a 2 kg roller and allowed to stand at 60 ° C. for 48 hours. After standing at 23 ° C. for 24 hours, the side bonded to the 50 ⁇ m-thick polyester film at 23 ° C. and 50% RH is fixed to a mounting jig of a high-speed peel tester, and the 25 ⁇ m-thick polyester film is pulled at a speed of 15 m. The maximum strength is measured when the foam is torn in the direction of 90 degrees per minute.
  • the cell structure of the foam substrate may be either a closed cell structure or an open cell structure.
  • the closed cell structure has an adhesive property and followability when bonded to an adherend, and excellent adhesive strength.
  • the average cell diameter in the flow direction and the width direction of the foam substrate is 1.2 to 700 ⁇ m, preferably 10 to 500 ⁇ m, more preferably 30 to 400 ⁇ m, and still more preferably 50 to 300 ⁇ m. By setting the average cell diameter in the flow direction and the width direction within the above range, it is preferable in order to have stickability and followability when bonded to an adherend using the pressure-sensitive adhesive tape of the present invention, and excellent adhesive strength.
  • the average cell diameter in the thickness direction of the foam base material is preferably 1 to 150 ⁇ m, more preferably 10 to 100 ⁇ m, although it depends on the thickness of the foam base material. In view of having good performance and followability, and excellent adhesive strength.
  • a foam base material is cut
  • the cut surface of the cut foam base material is enlarged 200 times using a digital microscope (trade name “KH-7700”, manufactured by HiROX), and then the width direction and the flow direction of the foam base material The cut surface of was photographed.
  • the bubble diameters of all the bubbles existing in an arbitrary range of thickness ⁇ width direction distance (2 mm) were measured, and the average value was calculated. Moreover, what averaged ten average values calculated by performing the said measurement with respect to arbitrary 10 places of the said cut surface was made into the average bubble diameter of the width direction.
  • the bubble diameters of all the bubbles existing in an arbitrary range of thickness ⁇ flow direction distance (2 mm) among the cut surfaces in the flow direction of the foam base material were measured, and the average value was calculated. Moreover, what averaged ten average values calculated by performing the said measurement with respect to arbitrary 10 places of the said cut surface was made into the average bubble diameter of a flow direction.
  • the apparent density of the foam base material is not particularly limited, but the interlaminar strength, compressive strength, average cell diameter, etc. are adjusted to the above ranges, and the adhesiveness and followability when adhering to the adherend, and the adherend Since it is easy to realize both excellent adhesion, it is 0.05 to 0.35 g / cm 3 , preferably 0.075 to 0.20 g / cm 3 , more preferably 0.1 to 0.15 g / cm. is there.
  • the apparent density was measured according to JISK6767. A foam base material cut into a 4 cm ⁇ 5 cm rectangle is prepared, and its mass is measured to determine the apparent density.
  • the thickness of the foam base material may be appropriately adjusted depending on the mode of use, but is preferably 0.05 to 1.5 mm. In the case of fixing electronic parts, particularly small and thin mobile devices, a thin tape thickness is required, so the base material thickness is preferably 50 to 500 ⁇ m, and preferably 70 to 400 ⁇ m. . Even at such a thin thickness, sufficient heat resistance can be maintained.
  • Compressive strength, tensile elastic modulus and the like of the foam base material can be appropriately adjusted depending on the material of 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 25% compressive strength, tensile elastic modulus, etc., but polyethylene, polypropylene, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer.
  • Polyolefin foams made of polymerized polymers, polyurethane foams, rubber foams made of acrylic rubber or other elastomers can be used. Polyolefin foams can be preferably used since the original physical properties are easily maintained even after being taken out from a high temperature.
  • polystyrene foam it is possible to use a polypropylene resin to follow the unevenness of the adherend surface and maintain the shape at high temperatures, even after taking out from high temperatures. This is preferable because the original physical properties are easily maintained.
  • the polyolefin resin when the polyolefin resin is 100 mol% of all the monomer components constituting the resin, the polyolefin resin in which the olefin hydrocarbon component in the resin is 10 mol% or more and 100 mol% or less may be used. Is preferred.
  • a propylene component such as a propylene homopolymer or an ethylene-propylene copolymer (random polypropylene, block polypropylene), an ethylene homopolymer, ethylene and a carbon number of 3 to 10
  • polyethylene resin (B) containing an ethylene component such as an ethylene- ⁇ -olefin copolymer composed of ⁇ -olefin and a copolymer of ethylene and non-olefin.
  • the polyolefin resin can be used alone or in combination of two or more, and preferably contains the polypropylene resin (A) and / or the polyethylene resin (B), and the polypropylene resin (A) and the polyethylene resin. It is preferable that (B) is contained in order to maintain the original physical properties even when taken out from a high temperature, and the sticking property and followability when sticking to the adherend, the form maintaining property at a high temperature.
  • a thermoplastic elastomer-based resin (C) can be used as necessary. By adding the thermoplastic elastomer resin (C), it is possible to maintain the original physical properties even when taken out from a high temperature, the sticking property and followability when pasting to the adherend, the form maintaining property at a high temperature. Further preferred.
  • polypropylene resin (A) used in the present invention examples include homopolypropylene, ethylene-propylene random copolymer, ethylene-propylene block copolymer, and the like, and if necessary, a propylene monomer and another copolymerizable monomer. Copolymers can also be used.
  • the polypropylene resin (A) in the polyolefin resin may be used by blending not only one type but also two or more types.
  • Random polypropylene and / or polypropylene resin having an ethylene content of 5 to 15% by mass, a melting point of 135 to 155 ° C., and an MFR (230 ° C.) of 0.5 to 5.0 in 100% by mass of the polypropylene resin (A)
  • a block polypropylene having an ethylene content of 1 to 5% by mass in 100% by mass, a melting point of 150 to 170 ° C., and an MFR (230 ° C.) of 1.0 to 7.0 is particularly preferable.
  • the proportion of the polypropylene resin (A) contained in the total resin constituting the foam is preferably 10 to 80% by weight, more preferably 20 to 70% by weight, and more preferably 25 to 65% by weight.
  • the proportion of the polypropylene resin (A) contained in the total resin constituting the foam is preferably 10 to 80% by weight, more preferably 20 to 70% by weight, and more preferably 25 to 65% by weight.
  • the polyethylene resin (B) used in the present invention includes high density polyethylene (HDPE), low density polyethylene (LDPE), linear low density polyethylene (LLDPE), ethylene-ethyl acrylate copolymer (EEA), ethylene-butyl.
  • An acrylate copolymer (EBA) etc. are mentioned, The copolymer of an ethylene monomer and another copolymerizable monomer can also be used as needed.
  • These polyethylene resins (B) may be blended not only in one type but also in two or more types.
  • the polyethylene resin (B) those having a density of 890 to 950 kg / m 3 and an MFR (190 ° C.) in the range of 1 to 15 g / 20 minutes are preferably used.
  • the density is 920 to 940 kg / m 3 and the MFR is used.
  • An ethylene- ⁇ -olefin copolymer having a (190 ° C.) of 2 to 10 g / 10 min and a melting point of 100 to 130 ° C. is more preferable.
  • the proportion of the polyethylene resin (B) is preferably 5 to 35% by weight, more preferably 10 to 30% by weight, and even more preferably 15 to 25% by weight.
  • the proportion of the polyethylene resin (B) is preferably 5 to 35% by weight, more preferably 10 to 30% by weight, and even more preferably 15 to 25% by weight.
  • thermoplastic elastomer resin (C) that can be used in the present invention is a polystyrene thermoplastic elastomer (SBC, TPS), a polyolefin thermoplastic elastomer (TPO), a vinyl chloride thermoplastic elastomer (TPVC), or a polyurethane heat.
  • SBC, TPS polystyrene thermoplastic elastomer
  • TPO polyolefin thermoplastic elastomer
  • TPVC vinyl chloride thermoplastic elastomer
  • Any conventionally known materials such as a thermoplastic elastomer (TPU), a polyester-based thermoplastic elastomer (TPEE, TPC), a polyamide-based thermoplastic elastomer (TPAE, TPA), and a polybutadiene-based thermoplastic elastomer may be used.
  • TPU thermoplastic elastomer
  • TPEE polyester-based thermoplastic elastomer
  • TPAE polyamide-based thermo
  • thermoplastic elastomer resins (C) may be blended not only in one type but also in two or more types.
  • the thermoplastic elastomer resin (C) those having a density of 850 to 920 kg / m 3 and an MFR (230 ° C.) in the range of 1 to 15 are preferably used. Among them, the density is 860 to 910 kg / m 3 and the MFR (230 Those having a temperature of 5 to 10 are particularly preferably used.
  • the content of the thermoplastic elastomer resin (C) is preferably 5 to 70% by mass, more preferably 10 to 60% by mass, and more preferably 20 to 50% by mass.
  • the content of the thermoplastic elastomer resin (C) is preferably 5 to 70% by mass, more preferably 10 to 60% by mass, and more preferably 20 to 50% by mass.
  • the content of the polypropylene resin (A) in the total resin constituting the foam is 30 to 60% by mass, and the polyethylene resin (B) is 1 to 20% by mass.
  • the thermoplastic elastomer-based resin (C) is preferably contained in an amount of 30 to 60 ** mass%, and the polypropylene resin (A) is contained in an amount of 30 ** to 55 ** mass%, and the polyethylene resin
  • (B) is 10 ** to 20 **% by mass
  • the thermoplastic elastomer resin (C) is contained in 30 ** to 50 **% by mass
  • antioxidants such as phenols, phosphoruss, amines and sulfurs, metal damage inhibitors, divinylbenzene, trimethylolpropane trimethacrylate, 1,6 -Hexanediol dimethacrylate, 1,9-nonanediol dimethacrylate, 1,10-decanediol dimethacrylate, triallyl isocyanurate, ethyl vinylbenzene, ethylene vinyl dimethacrylate, 1,2-benzenedicarboxylic acid diallyl ester, 1, Cross-linking assistants such as 3-benzenedicarboxylic acid diallyl ester, 1,4-benzenedicarboxylic acid diallyl ester and 1,2,4-benzenetricarboxylic acid diallyl ester, fillers such as mica and talc, bromine-based and phosphorus-based Flame retardant, ammonium trioxide Flame retardant aid such as
  • the foam base material of the present invention is produced by mixing a foaming agent capable of generating gas into a mixture of polyolefin resins, and as a production method thereof, a mixture of polyolefin resins, as a foaming agent, and thermally decomposed.
  • Normal pressure foaming method that melts and kneads by adding a mold chemical foaming agent and foams under normal pressure heating
  • Extrusion foaming method that heats and decomposes the thermal decomposition type chemical foaming agent in an extruder and foams while extruding under high pressure
  • press Such as a press foaming method in which a thermal decomposable chemical foaming agent is thermally decomposed in a mold and foamed while reducing pressure, and an extrusion foaming method in which a gas or a vaporizing solvent is melt-mixed in an extruder and foamed while being extruded under high pressure. A method is mentioned.
  • the thermal decomposition type chemical foaming agent used here is a chemical foaming agent that decomposes by applying heat and releases a gas.
  • azodicarbonamide, N, N′-dinitrosopentamethylenetetramine, P, P examples thereof include organic foaming agents such as' -oxybenzenesulfonylhydrazide, and inorganic foaming agents such as sodium bicarbonate, ammonium carbonate, ammonium bicarbonate, and calcium azide.
  • the gas or the solvent to be vaporized include gases such as carbon dioxide, nitrogen and helium, and vaporized solvents such as propane, normal butane and isobutane.
  • a foaming agent can be used individually or in combination of 2 types or more, respectively. In order to obtain a high-magnification foam that is flexible and has high moldability and a smooth surface, a normal pressure foaming method using azodicarbonamide as a foaming agent is preferably used.
  • the method for producing a polyolefin resin foam is not particularly limited, and the polyolefin resin, the thermal decomposition-type foaming agent and the foaming aid, and the foaming property containing a colorant for coloring the foam black or white.
  • a method comprising a step of heating and stretching in the direction to stretch the foamed tape and providing a pseudo skin layer on the surface of the foamed sheet. It is below.
  • the step of crosslinking the expandable polyolefin resin sheet is, for example, a method of irradiating the expandable polyolefin resin sheet with ionizing radiation, an organic peroxide previously blended in the expandable polyolefin resin composition, Examples include a method of heating the obtained expandable polyolefin resin sheet to decompose the organic peroxide, and these methods may be used in combination.
  • ionizing radiation examples include electron beams, ⁇ rays, ⁇ rays, and ⁇ rays.
  • the dose of ionizing radiation is such that the gel fraction of the polyolefin resin foam substrate is preferably 5% by mass to 70% by mass, more preferably 20% by mass to 60% by mass, and even more preferably 25% by mass to 55% by mass. However, the range of 5 to 200 kGy is preferable.
  • the irradiation with ionizing radiation forms a uniform cross-linked structure, and as a result, in order to form a relatively uniform foamed structure, it is preferable to irradiate from both sides of the foamable polyolefin resin sheet. Are preferably the same.
  • organic peroxide examples include 1,1-bis (t-butylperoxy) 3,3,5-trimethylcyclohexane, 1,1-bis (t-butylperoxy) cyclohexane, 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 peroxyneodecanate, t-butyl peroxybenzoate, 2,5
  • the addition amount of the organic peroxide is preferably 0.01 to 5 parts by mass, more preferably 0.1 to 3 parts by mass with respect to 100 parts by mass of the polyolefin resin.
  • the amount of the thermally decomposable foaming agent in the foamable polyolefin resin composition may be appropriately determined according to the expansion ratio of the polyolefin resin foam base material, but 1 mass with respect to 100 parts by mass of the polyolefin resin. Part to 40 parts by weight is preferable, and 1 part to 30 parts by weight 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 using a salt bath, and a method using an oil bath. May be used in combination. Among them, the method of heating with hot air or the method of heating with infrared rays is preferable because there is little difference between the front and back surfaces of the polyolefin resin foam substrate surface.
  • the method for slicing the foam base material is not particularly limited, and it may or may not be sliced. When slicing is performed, it may be appropriately adjusted depending on the thickness used by the foam base material, and both surfaces may be sliced or only one surface may be sliced.
  • the method for heating and stretching the foam substrate is not particularly limited, and it may or may not be heated and stretched. When performing heat stretching, it may be performed after slicing the foam base material, and may be performed on both surfaces or only on one surface.
  • the long foamable polyolefin resin sheet is stretched in the flow direction or width direction, or in the flow direction and width direction.
  • the foam base material may be stretched simultaneously in the flow direction and the width direction, or may be stretched separately one by one. .
  • the foam base material may be colored in order to develop design properties, light shielding properties, concealing properties, light reflectivity, and light resistance in the adhesive tape.
  • the colorants 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, complex oxidation
  • Physical black pigments and anthraquinone organic black pigments can be used. Of these, carbon black is preferred from the viewpoint of cost, availability, insulation, and heat resistance that can withstand the temperatures of the process of extruding the foamable polyolefin resin composition and the heating foaming process.
  • 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, zinc carbonate ,
  • Organic white colorants such as titanium, mica, gypsum, white carbon, diatomaceous earth, bentonite, lithopone, zeolite, sericite, etc., and organics such as silicone resin particles, acrylic resin particles, urethane resin particles, melamine resin particles And the like can be used white colorant.
  • aluminum oxide and zinc oxide are examples of aluminum oxide and zinc oxide.
  • the foamable polyolefin-based resin composition includes a foaming aid such as a plasticizer, an antioxidant, and zinc oxide, and a cell core modifier as long as the physical properties of the polyolefin-based resin foam substrate are not impaired.
  • a foaming aid such as a plasticizer, an antioxidant, and zinc oxide
  • a cell core modifier such as a cell core modifier as long as the physical properties of the polyolefin-based resin foam substrate are not impaired.
  • a known material such as may be optionally contained in the resin.
  • the polyolefin resin foam base material used for the adhesive tape of the present invention is 0.1% by mass to 10% by mass with respect to the polyolefin resin in order to maintain the sticking property and followability when being bonded to the adherend. % Is preferable, and 1% by
  • the colorant, the thermally decomposable foaming agent, the foaming aid, and the like when blending the colorant, the thermally decomposable foaming agent, the foaming aid, and the like into the foamable polyolefin resin composition, it is supplied to the extruder from the viewpoint of preventing color unevenness, partial excessive foaming, and insufficient foaming. It is preferable to prepare a masterbatch with a thermoplastic resin having high compatibility with the expandable polyolefin resin composition or the expandable polyolefin resin composition in advance.
  • surface treatment such as corona treatment, flame treatment, plasma treatment, hot air treatment, ozone / ultraviolet treatment, easy-adhesive treatment agent application, etc. May have been made.
  • the wetting index by the wetting reagent is 36 mN / m or more, preferably 40 mN / m, more preferably 48 mN / m, good adhesion to the adhesive can be obtained.
  • the foam base material having improved adhesion may be bonded to the pressure-sensitive adhesive layer in a continuous process. Further, the foam base material with improved adhesion may be temporarily wound up and stored, and then bonded to the pressure-sensitive adhesive layer in a separate process at a later date.
  • the foam base material having improved adhesion when winding up the foam base material having improved adhesion, it is preferable to wind it through a film made of paper, polyethylene, polypropylene, polyester, or the like in order to prevent blocking of the foam base material.
  • the film is preferably a polypropylene film or a polyester film having a thickness of 25 ⁇ m or less.
  • a pressure-sensitive adhesive composition used for a normal pressure-sensitive adhesive tape can be used.
  • the pressure-sensitive adhesive composition include (meth) acrylic pressure-sensitive adhesives, urethane-based pressure-sensitive adhesives, synthetic rubber-based pressure-sensitive adhesives, natural rubber-based pressure-sensitive adhesives, and silicone-based pressure-sensitive adhesives.
  • An adhesive composition can be preferably used.
  • acrylic pressure-sensitive adhesive composition examples include (meth) acrylates having 1 to 12 carbon atoms such as methyl (meth) acrylate, ethyl (meth) acrylate, n-butyl (meth) acrylate, and isobutyl (meth) acrylate.
  • (meth) acrylates having 4 to 12 carbon atoms in the alkyl group are preferable, and (meth) acrylates having a linear or branched structure having 4 to 8 carbon atoms are more preferable.
  • n-butyl acrylate is preferable because it is easy to ensure adhesion with the adherend.
  • the content of the (meth) acrylate having 1 to 12 carbon atoms in the acrylic copolymer is preferably 80 to 98.5% by mass in the monomer component constituting the acrylic copolymer, and is preferably 90 to 98. More preferably, it is 5 mass%.
  • the acrylic copolymer used in the present invention may be copolymerized with a highly polar vinyl monomer.
  • the highly polar vinyl monomer include a vinyl monomer having a hydroxyl group, a vinyl monomer having a carboxyl group, and a vinyl having an amide group. A monomer etc. are mentioned, These 1 type (s) or 2 or more types are used.
  • Examples of the monomer having a hydroxyl group include hydroxyl groups such as 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 6-hydroxyhexyl (meth) acrylate and the like ( A (meth) acrylate can be used.
  • vinyl monomer having a carboxyl group acrylic acid, methacrylic acid, itaconic acid, maleic acid, (meth) acrylic acid dimer, crotonic acid, ethylene oxide-modified succinic acid acrylate, etc. can be used. It is preferable to use it as a polymerization component.
  • Examples of the monomer having an amide group include N-vinylpyrrolidone, N-vinylcaprolactam, acryloylmorpholine, acrylamide, N, N-dimethylacrylamide and the like.
  • Examples of other highly polar vinyl monomers include sulfonic acid group-containing monomers such as vinyl acetate, ethylene oxide-modified succinic acid acrylate, and 2-acrylamido-2-methylpropanesulfonic acid.
  • the content of the highly polar vinyl monomer is preferably 1.5 to 20% by mass, more preferably 1.5 to 10% by mass in the monomer component constituting the acrylic copolymer, and 2 to More preferably, it is 8 mass%. By containing in the said range, it is easy to adjust the cohesive force, holding force, and adhesiveness of an adhesive to a suitable range.
  • the vinyl monomer having a functional group that reacts with it is preferably a hydroxyl group-containing vinyl monomer, such as 2-hydroxyethyl (meth) acrylate or 4-hydroxybutyl (meth) acrylate. 6-hydroxyhexyl (meth) acrylate is particularly preferred.
  • the content of the hydroxyl group-containing vinyl monomer that reacts with the isocyanate-based crosslinking agent is preferably 0.01 to 1.0% by mass of the monomer component constituting the acrylic copolymer, and is 0.03 to 0.3% by mass. % Is particularly preferred.
  • the acrylic copolymer can be obtained by copolymerization by a known polymerization method such as a solution polymerization method, a cage polymerization method, a suspension polymerization method, or an emulsion polymerization method.
  • a combination method or a bulk polymerization method is preferred.
  • Polymerization can be initiated by peroxides such as benzoyl peroxide and lauroyl peroxide, thermal initiation using azo-based thermal polymerization initiators such as azobisisobutylnitrile, acetophenone-based, benzoin ether-based, benzyl
  • azo-based thermal polymerization initiators such as azobisisobutylnitrile, acetophenone-based, benzoin ether-based, benzyl
  • a starting method by ultraviolet irradiation using a ketal-based, acylphosphine oxide-based, benzoin-based or 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 from 4 to 3 million, and preferably from 80 to 2.5 million.
  • the molecular weight measurement 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.
  • Tackifying resins include rosin, polymerized rosin, polymerized rosin ester, rosin phenol, stabilized rosin ester, disproportionated rosin ester, hydrogenated rosin ester, terpene, terpene phenol, petroleum resin Examples thereof include (meth) acrylate resins and the like.
  • an emulsion-type tackifying resin When used in an emulsion-type pressure-sensitive adhesive composition, it is preferable to use an emulsion-type tackifying resin.
  • disproportionated rosin ester tackifying resins polymerized rosin ester tackifying resins, rosin phenol tackifying resins, hydrogenated rosin ester tackifying resins, and (meth) acrylate resins are preferred.
  • One or more tackifying resins may be used.
  • the softening point of the tackifying resin is not particularly limited, but is 30 to 180 ° C, preferably 70 to 140 ° C.
  • the glass transition temperature is 30 to 200 ° C., preferably 50 to 160 ° C.
  • the blending ratio when using the acrylic copolymer and the tackifying resin is such that the content of the tackifying resin with respect to 100 parts by mass of the acrylic copolymer is preferably 5 to 60 parts by mass, It is preferable that it is a mass part. By setting the ratio between the two in this range, it becomes easy to ensure adhesion with the adherend.
  • the acrylic pressure-sensitive adhesive composition it is preferable to crosslink the pressure-sensitive adhesive in order to increase the cohesive strength of the pressure-sensitive adhesive layer.
  • a crosslinking agent include an isocyanate crosslinking agent, an epoxy crosslinking agent, a metal chelate crosslinking agent, and an aziridine crosslinking agent.
  • a crosslinking agent of a type that is added after the completion of polymerization and causes the crosslinking reaction to proceed is preferable, and an isocyanate-based crosslinking agent and an epoxy-based crosslinking agent that are highly reactive with a (meth) acrylic copolymer are preferable.
  • An isocyanate-based cross-linking agent is more preferable because adhesion to the substrate is improved.
  • Examples of the isocyanate-based crosslinking agent include tolylene diisocyanate, naphthylene-1,5-diisocyanate, hexamethylene diisocyanate, diphenylmethane diisocyanate, xylylene diisocyanate, trimethylolpropane-modified tolylene diisocyanate, and the like. Particularly preferred are trifunctional polyisocyanate compounds. Examples of the trifunctional isocyanate compound include tolylene diisocyanate, trimethylolpropane adducts thereof, and triphenylmethane isocyanate.
  • the value of the gel fraction for measuring the insoluble content after the pressure-sensitive adhesive layer is immersed in toluene for 24 hours is used.
  • the gel fraction is preferably 25 to 70% by mass.
  • the content is more preferably in the range of 30 to 60% by mass, still more preferably in the range of 30 to 55% by mass, both the cohesiveness and the adhesiveness are good.
  • the gel fraction is measured as follows. On the release sheet, the pressure-sensitive adhesive composition was applied so that the thickness after drying was 50 ⁇ m, dried at 100 ° C. for 3 minutes, and aged at 40 ° C. for 2 days. To do.
  • Additives for adhesives such as plasticizers, softeners, antioxidants, flame retardants, fillers such as glass and plastic fibers / balloons / beads, metal powders, metal oxides, metal nitrides Colorants such as pigments and dyes, leveling agents, thickeners, water repellents, antifoaming agents and the like can be optionally added to the pressure-sensitive adhesive composition.
  • the pressure-sensitive adhesive layer used for the pressure-sensitive adhesive tape of the present invention preferably has a temperature showing a peak value of loss tangent (tan ⁇ ) at a frequency of 1 Hz, preferably -40 ° C. to 15 ° C.
  • a peak value of loss tangent (tan ⁇ ) at a frequency of 1 Hz, preferably -40 ° C. to 15 ° C.
  • Dynamic viscoelastic properties are the types and ratios of monomers used in the acrylic copolymer constituting the pressure-sensitive adhesive, types and amounts of polymerization initiators, crosslinking agents, and polymerized rosin ester-based tackifying resins. It can be adjusted by appropriately selecting the type, amount used, polymerization method and the like.
  • the dynamic viscoelastic properties of the pressure-sensitive adhesive layer are defined by the loss tangent of the dynamic viscoelastic spectrum or the loss tangent and the storage elastic modulus at a specific frequency and a specific temperature. It is defined by the temperature indicating the maximum value of the loss tangent of the viscoelastic spectrum or the maximum value of the loss tangent.
  • the thickness of the pressure-sensitive adhesive layer used in the present invention is 10 to 100 ⁇ m in terms of the thickness of one side because it is easy to ensure adhesion to the adherend, rework suitability and removability even when a thin tape is used.
  • the thickness is 30 to 80 ⁇ m.
  • a release sheet used for this invention At least one surface of base materials, such as synthetic resin films, such as polyethylene, a polypropylene, and a polyester film, paper, a nonwoven fabric, cloth, a foam sheet, metal foil, and these laminated bodies
  • base materials such as synthetic resin films, such as polyethylene, a polypropylene, and a polyester film
  • paper, a nonwoven fabric, cloth, a foam sheet, metal foil, and these laminated bodies examples in which a release treatment such as a silicone treatment, a long-chain alkyl treatment, a fluorine treatment or the like for improving the peelability from the adhesive are given.
  • a polyethylene-laminated paper and a release sheet in which a silicone release treatment is performed on one side of a polyester film are preferable.
  • the adhesive tape of this invention can manufacture by a well-known and usual method. For example, it can be produced by applying the pressure-sensitive adhesive on one side or both sides of the substrate using a roll coater or a die coater and drying it.
  • the pressure-sensitive adhesive tape previously forms the pressure-sensitive adhesive layer by applying the pressure-sensitive adhesive on the surface of the release liner using a roll coater and the like, and then drying the pressure-sensitive adhesive layer. It can be manufactured by a transfer method in which both surfaces are bonded.
  • the pressure-sensitive adhesive tape of the present invention has excellent followability at the time of sticking, can maintain its form even when exposed to high temperatures, and is taken out from high temperatures However, since the original physical properties can be maintained, it can be used for fixing parts constituting various electronic devices including the mobile field and the automobile field.
  • An embodiment of the pressure-sensitive adhesive tape of the present invention has a basic structure in which a foam base material is used as a core and a pressure-sensitive adhesive layer is provided on one side or both sides of the base material.
  • the substrate and the pressure-sensitive adhesive layer may be directly laminated or may have other layers. These modes may be appropriately selected depending on the intended use.
  • a laminate layer such as a polyester film is used.
  • a light-shielding layer is provided.
  • a light reflection layer may be provided.
  • the thickness of the pressure-sensitive adhesive tape of the present invention may be appropriately adjusted depending on the mode of use, but it is preferably 70 to 1700 ⁇ m. In the case of fixing electronic device parts, particularly small and thin electronic devices, since a thin tape thickness is required, the thickness is more preferably 100 to 600 ⁇ m, and particularly preferably 120 ⁇ m to 500 ⁇ m.
  • the pressure-sensitive adhesive tape of the present invention is excellent in pastability and followability when bonded to an adherend, can maintain its form even when exposed to high temperatures, and can maintain its original physical properties even after being taken out from high temperatures, It can be used to fix parts that make up various electronic devices, including mobile and automobile fields.
  • the said weight average molecular weight is a weight average molecular weight in standard polystyrene conversion measured by a gel permeation chromatograph (GPC), and was measured with the following method.
  • the molecular weight measurement by the GPC method is a standard polystyrene conversion value measured using a GPC apparatus (HLC-8329GPC) manufactured by Tosoh Corporation.
  • Vernock D-40 manufactured by DIC Corporation, trimethylolpropane adduct of tolylene diisocyanate, isocyanate group content 7% by mass, non-volatile content 40% by mass with respect to 100 parts by mass of the adhesive solution.
  • an adhesive solvent (a) was obtained by filtering through a 100 mesh wire net.
  • Coronate L-45 manufactured by Nippon Polyurethane Co., Ltd., isocyanate-based crosslinking agent, solid content 45%
  • the pressure-sensitive adhesive solvent (b) was obtained by filtering through a 100 mesh wire net.
  • Example 1 On the surface of the release liner, the adhesive is applied using a bar coater so that the thickness of the adhesive layer after drying the adhesive solvent (a) is 50 ⁇ m, and dried at 80 ° C. for 3 minutes. Thus, an adhesive layer was prepared.
  • the pressure-sensitive adhesive layer was applied to both surfaces of a polyolefin-based foam base material A (polypropylene foam, adjusted to a thickness of 300 ⁇ m, and an apparent density of 0.129 g / cm 3 ).
  • An adhesive tape was prepared by curing for 48 hours.
  • Example 2 Instead of the polyolefin foam A, a polyolefin foam B (polypropylene + polyethylene elastomer foam, adjusted to a thickness of 300 ⁇ m and an apparent density of 0.158 g / cm 3 ) was used, and an adhesive tape was produced in the same manner as in Example 1. Was made.
  • a polyolefin foam B polypropylene + polyethylene elastomer foam, adjusted to a thickness of 300 ⁇ m and an apparent density of 0.158 g / cm 3
  • Example 3 In place of the polyolefin foam A, a polyolefin foam C (polypropylene + polyethylene elastomer foam, adjusted to a thickness of 300 ⁇ m and an apparent density of 0.158 g / cm 3 ) was used, and an adhesive tape was produced in the same manner as in Example 1. Was made.
  • a polyolefin foam C polypropylene + polyethylene elastomer foam, adjusted to a thickness of 300 ⁇ m and an apparent density of 0.158 g / cm 3
  • Example 4 instead of the polyolefin foam A, a polyolefin foam D (polypropylene + polyethylene elastomer foam, adjusted to a thickness of 300 ⁇ m and an apparent density of 0.060 g / cm 3 ) was used, and an adhesive tape was produced in the same manner as in Example 1. Was made.
  • a polyolefin foam D polypropylene + polyethylene elastomer foam, adjusted to a thickness of 300 ⁇ m and an apparent density of 0.060 g / cm 3
  • Example 5 instead of the polyolefin foam A, a polyolefin foam E (polypropylene + polyethylene elastomer foam, adjusted to a thickness of 300 ⁇ m and an apparent density of 0.066 g / cm 3 ) was used, and an adhesive tape was produced in the same manner as in Example 1. Was made.
  • a polyolefin foam E polypropylene + polyethylene elastomer foam, adjusted to a thickness of 300 ⁇ m and an apparent density of 0.066 g / cm 3
  • the adhesive On the surface of the release liner, the adhesive is applied using a bar coater so that the thickness of the adhesive layer after drying the adhesive solvent (a) is 50 ⁇ m, and dried at 80 ° C. for 3 minutes. Thus, an adhesive layer was prepared.
  • the pressure-sensitive adhesive layer is pasted on both surfaces of a polyolefin-based foam base material F (polyethylene foam, thickness adjusted to 300 ⁇ m, apparent density adjusted to 0.179 g / cm 3 ), and in an environment of 40 ° C.
  • An adhesive tape was prepared by curing for 48 hours.
  • a polyolefin foam G (polyethylene foam, thickness adjusted to 300 ⁇ m, apparent density adjusted to 0.126 g / cm 3 ) was used to produce an adhesive tape in the same manner as in Example 1. .
  • the apparent density of the foam base material was measured according to JISK6767. A foam base material cut into a 4 cm ⁇ 5 cm rectangle is prepared, and its mass is measured to determine the apparent density.
  • the tensile elastic modulus of the foam base material was measured according to JISK6767.
  • a foam substrate having a marked line length of 2 cm and a width of 1 cm was measured using a Tensilon tensile tester in an environment of 23 ° C. and 50% RH or 120 ° C. under measurement conditions of a tensile speed of 300 mm / min. From the obtained measurement value, the tensile modulus of elasticity of 100% was determined.
  • the tensile elastic modulus of the foam base material was measured according to JISK6767.
  • a foam substrate having a marked line length of 2 cm and a width of 1 cm was measured using a Tensilon tensile tester under conditions of 23 ° C., 50% RH and 120 ° C. under measurement conditions of a tensile speed of 300 mm / min. It is the maximum intensity of the measured value obtained.
  • the foam base material was cut to about 1 cm in both the flow direction and the width direction, and the center part of the cut surface of the foam base material was enlarged 200 times with a microscope (trade name “KH-7700”, manufactured by HIROX). Then, the cross section of the width direction of a foam base material or the flow direction was photographed so that the cut surface of a foam base material might fit in a photograph over the full length of the base material thickness direction. In the obtained photograph, all the bubble diameters existing on the cut surface having an actual length of 2 mm before expansion in the flow direction or the width direction were measured, and the average bubble diameter was calculated from the average value. This was measured at 10 arbitrary points, and the average value was defined as the average cell diameter in the flow direction (MD), the width direction (CD) and the thickness direction (VD).
  • the holding force of the pressure-sensitive adhesive tape is obtained by cutting the measurement sample into 20 mm width ⁇ required length with respect to the flow direction of the pressure-sensitive adhesive tape prepared in the examples and comparative examples.
  • a backing material such as aluminum foil is attached to the non-measurement side adhesive surface, and is attached so that an area of 20 mm ⁇ 20 mm is in contact with a SUS test plate at room temperature.
  • the test piece affixed to the test plate is reciprocated once at a speed of about 300 mm / min using a 2 kg rubber roller.
  • the pressurized test piece is allowed to stand at 23 ° C. for about 1 hour.
  • the test plate After the standing, the test plate is set on a holding force meter, a load of 500 g is applied to the test piece, and the test piece is left in a 120 ° C. environment for 24 hours. .
  • the deviation distance of the test piece after 24 hours was evaluated as follows. A: Deviation distance is less than 2 mm B: Deviation distance is 2 mm to 10 mm ⁇ : The displacement distance is 10 mm or more
  • the foam base material having excellent stickability and followability is used, and the dimensional change of the foam base material at a high temperature is suppressed, and at a high temperature of the pressure-sensitive adhesive tape. It can be seen that it has excellent holding power and has little change in repulsive stress during high temperature storage.
  • the dimensional change at a high temperature of the foam base material is large, the holding force of the adhesive tape at a high temperature is inferior, and the rebound stress changes at a high temperature and at room temperature are also large. . That is, it can be seen that the form can be maintained even when exposed to a high temperature environment, and the original physical properties can be maintained even when the temperature is returned to room temperature.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Adhesive Tapes (AREA)
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  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)

Abstract

Le problème à résoudre par la présente invention est de fournir une bande adhésive sensible à la pression comprenant une base en mousse, la bande adhésive sensible à la pression étant excellente en termes d'applicabilité et de conformabilité lorsqu'elle est appliquée à un élément, apte à conserver la forme même lorsqu'elle est exposée à des températures élevées, et apte à conserver les propriétés physiques d'origine après retour à la température ambiante. La présente invention concerne une bande adhésive sensible à la pression qui comprend une base en mousse et une couche adhésive sensible à la pression disposée sur au moins une surface de la base en mousse, caractérisée en ce que la base en mousse a une résistance à une compression de 25 % de 20 à 170 kPa et que lorsque le module de traction dans le sens machine à 23 °C et à 100 % d'allongement est exprimé par E1 et que le module de traction dans le sens machine à 120 °C et à 100 % d'allongement est exprimé par E2, alors le rapport E2/E1 est supérieur ou égal à 0,1 ou lorsque le module de traction dans le sens de la largeur à 23 °C et à 100 % d'allongement est exprimé par E1' et que le module de traction dans le sens de la largeur à 120 °C et à 100 % d'allongement est exprimé par E2', alors le rapport E2'/E1' est supérieur ou égal à 0,1.
PCT/JP2017/043959 2016-12-22 2017-12-07 Bande adhésive sensible à la pression Ceased WO2018116844A1 (fr)

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