WO2020059791A1 - 両面粘着テープ - Google Patents

両面粘着テープ Download PDF

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Publication number
WO2020059791A1
WO2020059791A1 PCT/JP2019/036726 JP2019036726W WO2020059791A1 WO 2020059791 A1 WO2020059791 A1 WO 2020059791A1 JP 2019036726 W JP2019036726 W JP 2019036726W WO 2020059791 A1 WO2020059791 A1 WO 2020059791A1
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WO
WIPO (PCT)
Prior art keywords
sensitive adhesive
resin layer
double
adhesive tape
pressure
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2019/036726
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English (en)
French (fr)
Japanese (ja)
Inventor
寛幸 片岡
友也 川本
泰志 石堂
智 土居
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sekisui Chemical Co Ltd
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Sekisui Chemical Co Ltd
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Publication date
Application filed by Sekisui Chemical Co Ltd filed Critical Sekisui Chemical Co Ltd
Priority to JP2020548590A priority Critical patent/JP7377210B2/ja
Priority to CN201980055425.3A priority patent/CN112601795B/zh
Priority to KR1020217000704A priority patent/KR102732185B1/ko
Publication of WO2020059791A1 publication Critical patent/WO2020059791A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • 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
    • C09J7/22—Plastics; Metallised plastics
    • C09J7/24—Plastics; Metallised plastics based on macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
    • 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
    • C09J7/25—Plastics; Metallised plastics based on macromolecular compounds obtained otherwise than by reactions involving only carbon-to-carbon unsaturated bonds
    • 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
    • C09J7/20—Adhesives in the form of films or foils characterised by their carriers
    • C09J7/29—Laminated material
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • 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]
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2301/00—Additional features of adhesives in the form of films or foils
    • C09J2301/10—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet
    • C09J2301/12—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers
    • C09J2301/124—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers the adhesive layer being present on both sides of the carrier, e.g. double-sided adhesive tape
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2301/00—Additional features of adhesives in the form of films or foils
    • C09J2301/30—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
    • C09J2301/312—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier parameters being the characterizing feature

Definitions

  • the present invention relates to a double-sided pressure-sensitive adhesive tape that has excellent stress relaxation and impact resistance, has excellent reworkability on both pressure-sensitive adhesive surfaces, and can be easily wound into a roll while suppressing the occurrence of wrinkles and breaks. .
  • Double-sided adhesive tapes are used for assembling portable electronic devices such as cellular phones and personal digital assistants (Personal Digital Assistants, PDA) (for example, Patent Documents 1 and 2). Further, a double-sided adhesive tape is also used for fixing a vehicle-mounted electronic device component such as a vehicle-mounted panel to a vehicle body.
  • PDA Personal Digital Assistants
  • Double-sided adhesive tapes used for fixing portable electronic device parts, vehicle-mounted electronic device parts, and the like. Further, in recent years, portable electronic devices, in-vehicle electronic devices, and the like have a tendency to become more complicated in shape with higher functionality. Therefore, a double-sided adhesive tape should be applied to steps, corners, non-planar portions, and the like. There is. In such a case, since the double-sided adhesive tape is fixed in a deformed state, a force for returning to the original shape, that is, a restoring force or a repulsive force acts, and the double-sided adhesive tape may peel off over time. Was.
  • a double-sided adhesive tape is required to have excellent stress relaxation. Further, the double-sided adhesive tape may be required to have impact resistance.
  • a double-sided pressure-sensitive adhesive tape using a foam base material As a double-sided pressure-sensitive adhesive tape having excellent stress relaxation properties and excellent impact resistance, a double-sided pressure-sensitive adhesive tape using a foam base material is known.
  • the foam base material is broken at the time of peeling when used for a temporary fixing purpose or when it is desired to peel off after lamination for some reason. Residues may remain on the body, resulting in poor reworkability.
  • double-sided adhesive tapes are required to have reworkability on both adhesive surfaces.
  • the double-sided pressure-sensitive adhesive tape is usually provided in a rolled state, and is used by unwinding from the roll. At this time, if the double-sided pressure-sensitive adhesive tape is not sufficiently flexible, handleability in winding into a roll may be reduced, and wrinkles or breakage may occur when winding.
  • the present invention provides a double-sided pressure-sensitive adhesive tape which has excellent stress relaxation and impact resistance, has excellent reworkability on both pressure-sensitive adhesive surfaces, and can be easily wound into a roll while suppressing wrinkles and breakage.
  • the purpose is to provide.
  • the present invention provides a double-sided pressure-sensitive adhesive tape having a foam base material and a first pressure-sensitive adhesive layer and a second pressure-sensitive adhesive layer on both surfaces of the foam base material, respectively. Having a first resin layer and a second resin layer having a tensile stress at break of 4 MPa or more, respectively, between the pressure-sensitive adhesive layers and between the foam base material and the second pressure-sensitive adhesive layer. At least one of the first resin layer and the second resin layer is a double-sided pressure-sensitive adhesive tape having a tensile modulus of 50 MPa or less.
  • the present invention will be described in detail.
  • a double-sided pressure-sensitive adhesive tape having a foam substrate and a first pressure-sensitive adhesive layer and a second pressure-sensitive adhesive layer on both surfaces of the foam substrate, respectively, comprises a foam substrate and a first pressure-sensitive adhesive.
  • the first resin layer and the second resin layer each having a tensile stress at break were equal to or more than a certain value between the layers and between the foam base material and the second pressure-sensitive adhesive layer.
  • the present inventors adopt a foam base material capable of exhibiting excellent stress relaxation property and impact resistance, while using a foam base material capable of exhibiting excellent stress relaxation properties. It has been found that excellent reworkability can be exhibited.
  • the present inventors have conducted further intensive studies and found that the wrinkles and wrinkles were reduced while ensuring reworkability on both adhesive surfaces by setting the tensile elastic modulus of at least one of the first resin layer and the second resin layer to a certain value or less.
  • the present inventors have found that it is possible to easily take up the film in a roll while suppressing the occurrence of breakage, and completed the present invention.
  • FIG. 1 is a schematic view showing an example of a double-sided pressure-sensitive adhesive tape according to one embodiment of the present invention.
  • a double-sided pressure-sensitive adhesive tape 1 according to one embodiment of the present invention in FIG. 1 has a first pressure-sensitive adhesive layer 31 and a second pressure-sensitive adhesive layer 32 on both surfaces of a foam base material 2.
  • the first resin layer 41 is disposed between the foam base material 2 and the first pressure-sensitive adhesive layer 31, and the second resin layer 41 is disposed between the foam base material 2 and the second pressure-sensitive adhesive layer 32.
  • a layer 42 is disposed.
  • the double-sided pressure-sensitive adhesive tape according to one embodiment of the present invention has a foam base material and a first pressure-sensitive adhesive layer and a second pressure-sensitive adhesive layer on both surfaces of the foam base material, respectively.
  • the double-sided pressure-sensitive adhesive tape according to one embodiment of the present invention can exhibit excellent stress relaxation and impact resistance.
  • the foam base material may have an open cell structure or a closed cell structure, but preferably has an open cell structure. By using a foam base material having an open cell structure, more excellent stress relaxation and impact resistance can be exhibited.
  • the foam base material may have a single-layer structure or a multilayer structure.
  • the foam base is not particularly limited, and examples thereof include a polyurethane foam, a polyolefin foam, a rubber-based resin foam, and an acrylic foam.
  • a polyurethane foam or a polyolefin foam is preferred because it can easily form an open cell structure and can exhibit excellent stress relaxation and impact resistance.
  • the density of the foam base material is not particularly limited, but a preferred lower limit is 0.03 g / cm 3 and a preferred upper limit is 0.8 g / cm 3 .
  • a preferred lower limit is 0.03 g / cm 3 and a preferred upper limit is 0.8 g / cm 3 .
  • the lower limit of the base material is more preferably 0.04 g / cm 3
  • the more preferable upper limit is 0.7 g / cm 3
  • the more preferable lower limit is 0.
  • the density can be measured using an electronic hydrometer (for example, “ED120T” manufactured by Mirage Co., Ltd.) in accordance with JIS K6767.
  • the 25% compressive strength of the foam base material is not particularly limited, a preferable lower limit is 1 kPa and a preferable upper limit is 100 kPa.
  • a preferable lower limit is 1 kPa and a preferable upper limit is 100 kPa.
  • a more preferred lower limit of the 25% compressive strength of the base material is 3 kPa
  • a more preferred upper limit is 80 kPa
  • a still more preferred lower limit is 5 kPa.
  • a preferred upper limit is 70 kPa.
  • the 25% compressive strength can be determined by measuring according to JIS K 6254.
  • the shear storage modulus of the foam base material is not particularly limited, but a frequency of 1.0 ⁇ 10 ⁇ 4 to 1.0 ⁇ 10 ⁇ in a master curve measured by a dynamic viscoelasticity apparatus and synthesized at a reference temperature of 23 ° C. It is preferable that the maximum value of the shear storage modulus in a 5 Hz region is 1.0 ⁇ 10 5 Pa or less.
  • the frequency range is a frequency corresponding to the peeling stress at a low speed generated when a restoring force or a repulsive force is applied to the double-sided adhesive tape.
  • the shear storage modulus in the frequency range is 1.0 ⁇ 10 5 Pa or less, the stress when a restoring force or a repulsive force is applied to the double-sided adhesive tape is reduced by the foam base material, Since it is difficult to transmit to the pressure-sensitive adhesive layer, the stress relaxation property and the impact resistance of the double-sided pressure-sensitive adhesive tape can be improved.
  • the shear storage modulus can be measured using a dynamic viscoelasticity measuring device (for example, DVA-200 manufactured by IT Keisoku Co., Ltd.) at a temperature rising rate of 5 ° C./min in the range of ⁇ 60 ° C. to 250 ° C. Can be measured.
  • an adhesive is applied to both sides of the substrate to measure the displacement of the sample during the measurement.
  • the pressure-sensitive adhesive is not particularly limited, but the pressure-sensitive adhesive applied to both sides of the substrate is adjusted so that the thickness is 15% or less of the thickness of the substrate, and the measurement is performed. By setting the thickness of the pressure-sensitive adhesive to 15% or less of the thickness of the base material, the influence of the pressure-sensitive adhesive can be eliminated as much as possible, and the shear storage modulus of the base material can be measured.
  • the thickness of the foam base material is not particularly limited, a preferable lower limit is 100 ⁇ m, and a preferable upper limit is 2900 ⁇ m.
  • the double-sided pressure-sensitive adhesive tape according to one embodiment of the present invention can be suitably used for fixing portable electronic device components, vehicle-mounted electronic device components, and the like.
  • a more preferable lower limit of the thickness of the foam base material is 200 ⁇ m
  • a more preferable upper limit is 2500 ⁇ m
  • a further preferable lower limit is 250 ⁇ m
  • a further preferable upper limit is 2000 ⁇ m
  • a particularly preferable lower limit is 1500 ⁇ m.
  • the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer may have the same composition or different compositions.
  • the pressure-sensitive adhesive layer is not particularly limited, and examples thereof include an acrylic pressure-sensitive adhesive layer, a rubber-based pressure-sensitive adhesive layer, a urethane pressure-sensitive adhesive layer, and a silicone-based pressure-sensitive adhesive layer.
  • an acrylic pressure-sensitive adhesive layer containing an acrylic copolymer because it is relatively stable to light, heat, moisture, etc. and can be bonded to various adherends (low adherence selectivity) Is preferred.
  • the acrylic copolymer constituting the acrylic pressure-sensitive adhesive layer contains a monomer mixture containing butyl acrylate and / or 2-ethylhexyl acrylate from the viewpoint of improving the initial tack and improving the ease of application at low temperatures. It is preferably obtained by polymerization. More preferably, it is obtained by copolymerizing a monomer mixture containing butyl acrylate and 2-ethylhexyl acrylate.
  • the preferred lower limit of the content of the butyl acrylate in the entire monomer mixture is 40% by weight, and the preferred upper limit is 80% by weight.
  • the preferred lower limit of the content of 2-ethylhexyl acrylate in the total monomer mixture is 10% by weight, the preferred upper limit is 100% by weight, the more preferred lower limit is 30% by weight, the more preferred upper limit is 80% by weight, and the further preferred lower limit is 50% by weight. %, And a more preferred upper limit is 60% by weight.
  • the monomer mixture may contain other copolymerizable monomer other than butyl acrylate and 2-ethylhexyl acrylate, if necessary.
  • the other polymerizable monomers that can be copolymerized include alkyl (meth) acrylates having 1 to 3 carbon atoms in the alkyl group, alkyl (meth) acrylates having 13 to 18 carbon atoms in the alkyl group, Functional monomers and the like.
  • Examples of the alkyl (meth) acrylate having 1 to 3 carbon atoms in the alkyl group include methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, and (meth) acrylic acid.
  • alkyl (meth) acrylate having 13 to 18 carbon atoms in the alkyl group include tridecyl methacrylate and stearyl (meth) acrylate.
  • the functional monomer include hydroxyalkyl (meth) acrylate, glycerin dimethacrylate, glycidyl (meth) acrylate, 2-methacryloyloxyethyl isocyanate, (meth) acrylic acid, itaconic acid, maleic anhydride, crotonic acid, Maleic acid, fumaric acid and the like can be mentioned.
  • a radical reaction may be performed on the monomer mixture in the presence of a polymerization initiator.
  • a method of causing a radical reaction of the monomer mixture that is, a polymerization method
  • a conventionally known method is used, and examples thereof include solution polymerization (boiling point polymerization or constant temperature polymerization), emulsion polymerization, suspension polymerization, bulk polymerization, and the like.
  • the weight-average molecular weight (Mw) of the acrylic copolymer has a preferred lower limit of 400,000 and a preferred upper limit of 1.5 million. By setting the weight average molecular weight of the acrylic copolymer within this range, high adhesive strength can be exhibited. From the viewpoint of further improving the adhesive strength, a more preferred lower limit of the weight average molecular weight is 500,000, and a more preferred upper limit is 1.4 million.
  • the weight average molecular weight (Mw) is a weight average molecular weight in terms of standard polystyrene measured by GPC (Gel Permeation Chromatography).
  • a preferable upper limit of the ratio (Mw / Mn) of the weight average molecular weight (Mw) to the number average molecular weight (Mn) of the acrylic copolymer is 10.0.
  • Mw / Mn is 10.0 or less, the ratio of the low molecular component is suppressed, and the pressure-sensitive adhesive layer is softened at a high temperature, so that the bulk strength is reduced and the adhesive strength is suppressed from being reduced.
  • the more preferable upper limit of Mw / Mn is 5.0, and the more preferable upper limit is 3.0.
  • the pressure-sensitive adhesive layer may contain a tackifier resin.
  • the tackifying resin include a rosin ester resin, a hydrogenated rosin resin, a terpene resin, a terpene phenol resin, a cumarone indene resin, an alicyclic saturated hydrocarbon resin, a C5 petroleum resin, and a C9 resin. Petroleum resins, C5-C9 copolymer petroleum resins, and the like. These tackifier resins may be used alone or in combination of two or more.
  • the content of the tackifier resin is not particularly limited, but a preferable lower limit is 10 parts by weight, and a preferable upper limit is 60 parts by weight based on 100 parts by weight of a resin (for example, an acrylic copolymer) as a main component of the pressure-sensitive adhesive layer. .
  • a resin for example, an acrylic copolymer
  • the content of the tackifier resin is 10 parts by weight or more, a decrease in the adhesive strength of the pressure-sensitive adhesive layer can be suppressed.
  • the content of the tackifier resin is 60 parts by weight or less, it is possible to suppress a decrease in adhesive strength or tackiness due to the hardness of the pressure-sensitive adhesive layer.
  • a cross-linking structure is formed between main chains of a resin (for example, the acrylic copolymer, the tackifying resin, or the like) constituting the pressure-sensitive adhesive layer by adding a cross-linking agent.
  • a cross-linking agent is not particularly limited, and examples thereof include an isocyanate-based crosslinking agent, an aziridine-based crosslinking agent, an epoxy-based crosslinking agent, and a metal chelate-type crosslinking agent. Of these, isocyanate-based crosslinking agents are preferred.
  • the isocyanate group of the isocyanate-based cross-linking agent and the alcohol in the resin constituting the pressure-sensitive adhesive layer for example, the acrylic copolymer, the tackifying resin, etc.
  • the cross-linking of the pressure-sensitive adhesive layer is loosened by the reaction with the hydroxyl group. Therefore, the pressure-sensitive adhesive layer can disperse the intermittent peeling stress, and the adhesive strength of the double-sided pressure-sensitive adhesive tape is further improved.
  • the amount of the crosslinking agent to be added is preferably 0.01 to 10 parts by weight, more preferably 0.1 to 7 parts by weight, based on 100 parts by weight of the resin (eg, the acrylic copolymer) as the main component of the pressure-sensitive adhesive layer. Is more preferred.
  • the degree of crosslinking of the pressure-sensitive adhesive layer is preferably from 5 to 70% by weight, more preferably from 10 to 60% by weight, and more preferably from 15 to 60% by weight, from the viewpoint of suppressing peeling from the adherend when a large shear load is applied. 50% by weight is particularly preferred.
  • the pressure-sensitive adhesive layer may contain a silane coupling agent for the purpose of improving the adhesive strength.
  • the silane coupling agent is not particularly limited, and examples thereof include epoxy silanes, acrylic silanes, methacryl silanes, amino silanes, and isocyanate silanes.
  • the pressure-sensitive adhesive layer may contain a coloring material for the purpose of imparting light-shielding properties.
  • the coloring material is not particularly limited, and examples thereof include carbon black, aniline black, and titanium oxide. Among them, carbon black is preferred because it is relatively inexpensive and chemically stable.
  • the pressure-sensitive adhesive layer may contain conventionally known fine particles and additives such as inorganic fine particles, conductive fine particles, an antioxidant, a foaming agent, an organic filler, and an inorganic filler, if necessary.
  • the thickness of the pressure-sensitive adhesive layer is not particularly limited, but a preferable lower limit of the thickness of the pressure-sensitive adhesive layer on one side is 0.01 mm, and a preferable upper limit is 0.1 mm.
  • the double-sided pressure-sensitive adhesive tape according to one embodiment of the present invention can be suitably used for fixing portable electronic device components, vehicle-mounted electronic device components, and the like. From the viewpoint of being more suitably used for fixing the above components and the like, a more preferred lower limit of the thickness of the pressure-sensitive adhesive layer is 0.015 mm, and a more preferred upper limit is 0.09 mm.
  • the double-sided pressure-sensitive adhesive tape according to one embodiment of the present invention includes a first resin between the foam base material and the first pressure-sensitive adhesive layer, and between the foam base material and the second pressure-sensitive adhesive layer. It has a layer and a second resin layer, respectively (hereinafter, both are also simply referred to as “resin layer”). That is, the double-sided pressure-sensitive adhesive tape according to an embodiment of the present invention has a first resin layer between the foam base material and the first pressure-sensitive adhesive layer, and the foam base material and the second A second resin layer is provided between the pressure-sensitive adhesive layers.
  • the double-sided pressure-sensitive adhesive tape employs the foam base material capable of exhibiting excellent stress relaxation and impact resistance, and the foam base material at the time of peeling. Can be separated without leaving any residue on the adherend, and excellent reworkability can be exhibited on both adhesive surfaces. Further, by setting the tensile elastic modulus of at least one of the first resin layer and the second resin layer to be equal to or less than a certain value, it is possible to easily perform the roll while suppressing the occurrence of wrinkles and breaks while securing reworkability on both adhesive surfaces. It can be wound in a shape.
  • the resin layer has a tensile stress at break at 4 MPa or more. That is, the double-sided pressure-sensitive adhesive tape according to one embodiment of the present invention has a first resin layer having a tensile break stress of 4 MPa or more between the foam base material and the first pressure-sensitive adhesive layer, and A second resin layer having a tensile stress at break of 4 MPa or more is provided between the foam base material and the second pressure-sensitive adhesive layer.
  • a resin layer having a tensile break stress of 4 MPa or more excellent reworkability can be exhibited.
  • the tensile stress at break of the resin layer is preferably 5 MPa or more, more preferably 11.5 MPa or more, and even more preferably 15 MPa or more.
  • the upper limit of the tensile stress at break of the resin layer is not particularly limited, the upper limit is substantially about 200 MPa.
  • At least one of the first resin layer and the second resin layer has a tensile modulus of 50 MPa or less.
  • the flexibility of the entire double-sided pressure-sensitive adhesive tape is secured, and the double-sided pressure-sensitive adhesive tape is rolled. It becomes easy to wind up, and the handleability is remarkably improved, and no wrinkles or breaks occur at the time of winding up.
  • the first resin layer and the second resin layer may both have a tensile modulus of 50 MPa or less, or only one may have a tensile modulus of 50 MPa or less, and the other may have a tensile modulus of 50 MPa. May exceed.
  • the double-sided pressure-sensitive adhesive tape has particularly excellent flexibility.
  • the double-sided pressure-sensitive adhesive tape has an appropriate hardness and is easy to handle. And it becomes easy to cut using, for example, a blade.
  • the tensile modulus of the other resin layer having a tensile modulus of more than 50 MPa is preferably 500 MPa or more, more preferably 1000 MPa or more, and even more preferably 1500 MPa or more.
  • the lower limit of the tensile modulus is not particularly limited, but is preferably 10 MPa or more, and more preferably 20 MPa or more.
  • At least one of the first resin layer and the second resin layer having a tensile modulus of 50 MPa or less (hereinafter, also referred to as a “resin layer having a tensile modulus of 50 MPa or less”) has a tensile elongation at break of 400% or more. It is preferred that When the tensile elongation at break of the resin layer having a tensile modulus of 50 MPa or less is 400% or more, more excellent reworkability can be exhibited. From the viewpoint of further improving the reworkability, the tensile elongation at break of the resin layer having a tensile elastic modulus of 50 MPa or less is preferably 450% or more, and more preferably 500% or more.
  • the upper limit of the tensile elongation at break of the resin layer having a tensile modulus of 50 MPa or less is not particularly limited, but is substantially about 1500%.
  • the tensile break stress, the tensile break elongation, and the tensile elastic modulus mean the mechanical properties of the resin layer, and can be measured by a method according to JIS K7161. Specifically, for example, a test piece is prepared by punching out the resin layer on a dumbbell using a punching blade “Tension No. 1 dumbbell shape” manufactured by Kobunshi Keiki Co., Ltd. The obtained test piece is measured at a tensile speed of 100 mm / min using, for example, “Autograph AGS-X” manufactured by Shimadzu Corporation to break the test piece. The tensile breaking stress is calculated from the breaking strength per unit area when the test piece breaks.
  • the tensile elongation at break is calculated by “(distance between grippers at break / distance between initial grippers) ⁇ 100”.
  • the tensile modulus is calculated from the gradient of the tensile strength between 1% and 3% strain.
  • the resin constituting the resin layer is not particularly limited, for example, a polyester resin such as polyethylene terephthalate, an acrylic resin, a polyethylene resin, a polypropylene resin, polyvinyl chloride, an epoxy resin, a silicone resin, a phenol resin, a polyimide, Examples include polyester-based resins and polycarbonates. Among them, acrylic resins, polyethylene resins, polypropylene resins, and polyester resins are preferred because the adhesive tape is excellent in flexibility. Among the polyester resins, polyethylene terephthalate is preferred.
  • the resin layer having a tensile modulus of 50 MPa or less preferably contains a thermoplastic elastomer from the viewpoint of further improving stress relaxation, impact resistance and reworkability.
  • the thermoplastic elastomer includes a styrene (co) polymer, an olefin (co) polymer, a vinyl chloride (co) polymer, a polyetherester triblock (co) polymer, and a polyester (co) polymer. It may be a coalesced, urethane (co) polymer, amide (co) polymer or acrylic (co) polymer.
  • the thermoplastic elastomer is an acrylic (co) polymer, a styrene (co) polymer or an olefin (co) polymer. Furthermore, an acrylic (co) polymer or a styrene (co) polymer is more preferable, and a styrene (co) polymer is more preferable.
  • the content of the thermoplastic elastomer in the resin layer having a tensile modulus of 50 MPa or less is preferably 70% by weight or more, more preferably 80% by weight or more, further preferably 90% by weight or more, and particularly preferably 95% by weight. As described above, it may be 100% by weight, and is usually 100% by weight or less.
  • the resin layer having a tensile modulus of 50 MPa or less preferably contains a block copolymer from the viewpoint of further improving stress relaxation, impact resistance and reworkability.
  • the fact that the resin layer having a tensile modulus of 50 MPa or less is made of a block copolymer having the above-described hard segment and soft segment means that when the resin layer is subjected to differential scanning calorimetry (DSC), It can be confirmed by observing one or more peaks above and below the boundary of the temperature.
  • DSC differential scanning calorimetry
  • the resin layer having a tensile modulus of 50 MPa or less more preferably contains a triblock copolymer.
  • a triblock copolymer having a hard segment and a soft segment.
  • the resin layer having a tensile modulus of 50 MPa or less contains a diblock copolymer and a triblock copolymer from the viewpoint of further improving stress relaxation, impact resistance and reworkability, that is, It is also preferred that the mixture be composed of a mixture of a block copolymer and a triblock copolymer.
  • the content of the triblock copolymer in the resin layer having a tensile modulus of 50 MPa or less is 60% by weight from the viewpoint of further improving stress relaxation, impact resistance and reworkability. % Is preferable.
  • the content is more preferably 70% by weight or more, further preferably 80% by weight or more, particularly preferably 90% by weight or more, may be 100% by weight, and is usually 100% by weight or less.
  • the ratio of the hard segment is preferably from 10% by weight to 50% by weight.
  • the ratio of the hard segment is more preferably 12% by weight or more and 45% by weight or less, further preferably 14% by weight or more and 40% by weight or less, and particularly preferably 35% by weight or less.
  • the molecular weight of the hard segment is preferably 50,000 or more, more preferably 53,000 or more, and More preferably, it is 50,000 or more.
  • the molecular weight of the hard segment in the block copolymer is preferably 100,000 or less, more preferably 75,000 or less, and even more preferably 70,000 or less. When the molecular weight of the hard segment is within this range, particularly excellent reworkability can be exhibited.
  • the ratio of the soft segment is preferably 50% by weight or more and 90% by weight or less.
  • the content is more preferably 55% by weight or more and 88% by weight or less, further preferably 60% by weight or more and 86% by weight or less, and particularly preferably 65% by weight or less.
  • the molecular weight of the soft segment is preferably 100,000 or more, more preferably 130,000 or more, and more preferably 150,000 or more. It is even more preferred.
  • the molecular weight of the soft segment in the block copolymer is preferably 500,000 or less, more preferably 400,000 or less, and further preferably 380,000 or less.
  • the resin layer having a tensile modulus of 50 MPa or less exhibits high tackiness
  • the foam substrate particularly a foam comprising a polyurethane foam or a polyolefin foam. The adhesion to the substrate is improved.
  • the resin layer having a tensile modulus of 50 MPa or less contains the block copolymer
  • a cross section of the block copolymer is observed with an atomic force microscope (AFM)
  • AFM atomic force microscope
  • a sphere-like phase separation structure is formed.
  • Observation of such a sphere-like phase separation structure means that the resin layer having a tensile modulus of 50 MPa or less has a microphase separation structure, and the resin layer can achieve both flexibility and strength. And excellent reworkability can be exhibited.
  • block copolymer examples include styrene-based block copolymers, acrylic-based block copolymers, polyetherester-based block copolymers, urethane-based block copolymers, vinyl chloride-based block copolymers, amides System block copolymers and the like. Above all, it is easy to adjust the tensile break stress and tensile modulus of the resin layer, and it is easy to laminate on the foam base material by exhibiting sufficient tackiness. Polymers are preferred.
  • the styrene-acrylic block copolymer is a block copolymer of styrene and an alkyl (meth) acrylate.
  • the styrene-acrylic block copolymer has a block derived from styrene and a block derived from an alkyl (meth) acrylate.
  • a block derived from styrene constitutes a hard segment
  • a block derived from an alkyl (meth) acrylate constitutes a soft segment. That is, a styrene-acrylic block copolymer containing a block derived from styrene as a component constituting a hard segment and a block derived from an alkyl (meth) acrylate as a component constituting a soft segment is preferable. It is.
  • the styrene-acrylic block copolymer contains styrene as a component constituting a hard segment. This makes it possible to easily adjust the tensile stress at break of the resin layer to 4 MPa or more and the tensile modulus to 50 MPa or less.
  • the proportion of styrene in the entire styrene-acrylic block copolymer is preferably 5% by weight or more, more preferably 8% by weight or more, and further preferably 12% by weight or more.
  • the proportion of styrene in the entire styrene-acrylic block copolymer is preferably 30% by weight or less, more preferably 20% by weight or less.
  • the ratio of styrene in the hard segment of the styrene-acrylic block copolymer is preferably at least 70% by weight, more preferably at least 80% by weight.
  • the styrene-acrylic block copolymer may contain a component other than styrene as a component constituting the hard segment.
  • the components other than styrene include methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, n-butyl (meth) acrylate, tert-butyl (meth) acrylate, and 2-ethylhexyl (meth).
  • (meth) acrylic acid esters having a hydroxyl group such as 4-hydroxybutyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, and tetrahydrofurfuryl (meth) acrylate can be used.
  • a monomer having a carboxyl group such as (meth) acrylic acid can be used.
  • a monomer having a glycidyl group such as glycidyl (meth) acrylate can be used.
  • a monomer having an amide group such as hydroxyethyl (meth) acrylamide, isopropyl (meth) acrylamide, and dimethylaminopropyl (meth) acrylamide can be used.
  • a monomer having a nitrile group such as (meth) acrylonitrile can be used.
  • various monomers used in general (meth) acrylic copolymers such as vinyl carboxylate such as vinyl acetate and acrylonitrile and styrene can also be used.
  • the component other than the styrene it is particularly preferable to include a monomer having a carboxyl group.
  • a monomer having a carboxyl group as a component constituting a hard segment, the styrene-acrylic block copolymer can be crosslinked by a crosslinking agent.
  • a resin layer that satisfies the desired tensile stress at break and tensile elastic modulus is formed. , The manufacturability is improved.
  • the proportion of the monomer having a carboxyl group in the hard segment is preferably 10% by weight or more.
  • the crosslinking agent is not particularly limited, and a general one such as an isocyanate-based crosslinking agent can be used.
  • a (meth) acrylate having a hydroxyl group may be contained as the component other than the styrene.
  • a (meth) acrylic acid ester having a hydroxyl group as a component constituting the hard segment, the adhesion between the resin layer and the foam base material can be improved.
  • the ratio of the (meth) acrylate having a hydroxyl group in the hard segment is preferably 0.1% by weight or more.
  • the styrene-acrylic block copolymer contains an alkyl (meth) acrylate as a component constituting a soft segment. This makes it possible to easily adjust the tensile stress at break of the resin layer to 4 MPa or more and the tensile modulus to 50 MPa or less.
  • alkyl (meth) acrylate examples include various alkyl (meth) acrylates described as components other than styrene constituting the hard segment.
  • n-butyl (meth) acrylate or 2-ethylhexyl (meth) acrylate is preferable because high tackiness can be imparted to the resin layer having a tensile modulus of 50 MPa or less.
  • the ratio of n-butyl (meth) acrylate or 2-ethylhexyl (meth) acrylate in the soft segment of the styrene-acrylic block copolymer is preferably at least 10% by weight.
  • the content is more preferably 20% by weight or more, further preferably 30% by weight or more, particularly preferably 40% by weight or more, and may be 100% by weight.
  • the alkyl (meth) acrylate preferably further contains methyl (meth) acrylate or ethyl (meth) acrylate in order to improve the tensile rupture stress and the rupture elongation of the resin layer.
  • the ratio of methyl (meth) acrylate or ethyl (meth) acrylate in the soft segment of the styrene-acrylic block copolymer is preferably 10% by weight or more, more preferably 20% by weight or more, and 30% by weight. %, More preferably at least 40% by weight. Further, it is preferably at most 80% by weight, more preferably at most 70% by weight, further preferably at most 60% by weight.
  • the resin layer may be colored.
  • a light-shielding property can be imparted to the double-sided pressure-sensitive adhesive tape.
  • the method of coloring the resin layer is not particularly limited. For example, a method of kneading particles such as carbon black and titanium oxide or fine bubbles into the resin constituting the resin layer, and applying ink to the surface of the resin layer Method and the like.
  • the resin layer may contain, if necessary, conventionally known fine particles and additives such as inorganic fine particles, conductive fine particles, a plasticizer, a tackifier, an ultraviolet absorber, an antioxidant, a foaming agent, an organic filler, and an inorganic filler. May be contained.
  • the resin constituting at least one of the first resin layer and the second resin layer is made of a thermoplastic elastomer
  • the resin may contain a resin other than the thermoplastic elastomer.
  • the thickness of the resin layer is not particularly limited, but a preferred lower limit is 5 ⁇ m and a preferred upper limit is 100 ⁇ m. By setting the thickness of the resin layer in this range, the double-sided pressure-sensitive adhesive tape according to one embodiment of the present invention can exhibit more excellent reworkability. From the viewpoint of further improving the reworkability, a more preferred lower limit of the thickness of the resin layer is 10 ⁇ m, and a more preferred upper limit is 70 ⁇ m.
  • the double-sided pressure-sensitive adhesive tape according to one embodiment of the present invention may have another layer other than the foam base material, the pressure-sensitive adhesive layer, and the resin layer, if necessary.
  • the thickness of the double-sided pressure-sensitive adhesive tape according to one embodiment of the present invention is not particularly limited, a preferable lower limit is 0.2 mm and a preferable upper limit is 3 mm.
  • a preferable lower limit is 0.2 mm and a preferable upper limit is 3 mm.
  • the more preferable lower limit of the thickness of the double-sided pressure-sensitive adhesive tape according to one embodiment of the present invention is 0.3 mm, and the more preferable upper limit is 2.8 mm.
  • a laminate of the foam base material and the first resin layer is manufactured, and a second resin layer is laminated on the laminate, and a first resin layer / foam base material / second resin layer is formed.
  • the resin layer and the foam base material are easily laminated because the resin layer has tackiness. be able to.
  • the adhesiveness can be improved by pressing the resin layer and the foam base material with a heated laminator.
  • the adhesion can be further improved.
  • a surface treatment for example, a plasma treatment or a corona treatment
  • the adhesion between the resin layer and the foam base material can be improved.
  • an adhesive layer may be provided between the foam base material and the resin layer and laminated.
  • a pressure-sensitive adhesive solution for forming the pressure-sensitive adhesive layer is prepared, the pressure-sensitive adhesive solution is applied to a release-treated surface of a release film, and the solvent in the solution is completely dried and removed to obtain a first pressure-sensitive adhesive.
  • the first pressure-sensitive adhesive layer is provided on the first resin layer-side surface of the laminate composed of the first resin layer / foam base material / second resin layer, and the first pressure-sensitive adhesive layer is formed of the first pressure-sensitive adhesive layer. It is superposed in a state facing the resin layer side.
  • a release film different from the above release film is prepared, an adhesive solution is applied to the release treated surface of the release film, and the solvent in the solution is completely dried and removed, thereby releasing the release film.
  • a second pressure-sensitive adhesive layer is provided on the second resin layer side surface of the laminate comprising the first resin layer / foam base material / second resin layer.
  • a laminate comprising a first pressure-sensitive adhesive layer / a first resin layer / a foam base material / a second resin layer / a second pressure-sensitive adhesive layer is obtained by superimposing them in a state facing the side.
  • the obtained laminate by pressing the obtained laminate with a rubber roller or the like, it has a first pressure-sensitive adhesive layer / first resin layer / foam base material / second resin layer / second pressure-sensitive adhesive layer,
  • a double-sided pressure-sensitive adhesive tape in which the surfaces of both pressure-sensitive adhesive layers are covered with a release film can be obtained.
  • the release film in contact with the second pressure-sensitive adhesive layer is peeled off, and the second pressure-sensitive adhesive layer can be wound inside.
  • the release film in contact with the first pressure-sensitive adhesive layer needs to be subjected to a double-sided release treatment.
  • the application of the double-sided pressure-sensitive adhesive tape according to one embodiment of the present invention is not particularly limited, and is used, for example, for fixing portable electronic device components, vehicle-mounted electronic device components, and the like.
  • the shape of the double-sided pressure-sensitive adhesive tape according to an embodiment of the present invention in these applications is not particularly limited, and examples thereof include a rectangle, a frame, a circle, an ellipse, and a donut.
  • the double-sided pressure-sensitive adhesive tape according to one embodiment of the present invention has excellent adhesion reliability in a state where a peeling stress is applied at a low speed such as a restoring force or a repulsive force, and is applied to a step, a corner, a non-planar part, or the like. It is preferable to be attached or used to fix the part in a deformed state. On the other hand, since it is excellent in reworkability, it can be suitably used for temporary fixing purposes. Furthermore, even if it is desired to peel off after lamination for some reason, there is no possibility that the foam base material is broken at the time of peeling and a residue remains on the adherend.
  • the double-sided pressure-sensitive adhesive tape according to one embodiment of the present invention can be easily wound up in a roll while suppressing the occurrence of wrinkles and breakage, so that it is usually stored in a rolled state, It can be used by unwinding from the shape.
  • Articles using the double-sided pressure-sensitive adhesive tape according to one embodiment of the present invention include, for example, flat panel displays used in TVs, monitors, portable electronic devices, camera modules of portable electronic devices, internal members of portable electronic devices, and vehicles. Interior and exterior of home appliances (for example, TVs, air conditioners, refrigerators, etc.).
  • Examples of the adherend of the double-sided pressure-sensitive adhesive tape according to one embodiment of the present invention include side panels, back panels, various nameplates, decorative films, decorative films, and the like of portable electronic devices.
  • a double-sided adhesive having excellent stress relaxation and impact resistance, excellent reworkability on both adhesive surfaces, and capable of being easily wound into a roll while suppressing wrinkles and breakage. Tape can be provided.
  • RAFT agent chain transfer agent
  • the temperature in the flask was raised to 85 ° C. while the atmosphere in the flask was replaced with nitrogen gas. Thereafter, the polymerization reaction was carried out by stirring at 85 ° C. for 6 hours to obtain a reaction solution containing a styrene-acrylic block copolymer A comprising a hard segment A and a soft segment B.
  • the blending amount of the mixture (soft segment B) and the hard segment A was such that the mass ratio of the hard segment to the soft segment in the obtained block copolymer was 34/66.
  • Table 1 shows the overall design, hard segment design, and soft segment design of the obtained styrene-acrylic block copolymer A.
  • Styrene-Acrylic Block Copolymers B to L are included in the same manner as styrene-acrylic block copolymer A, except that the overall design, hard segment design, and soft segment design are as shown in Table 1. A reaction solution was obtained. Table 1 shows the overall design, hard segment design, and soft segment design of the obtained styrene-acrylic block copolymers BL.
  • Example 1 (1) Preparation of First Resin Layer
  • a 50 ⁇ m-thick polyethylene terephthalate (PET) sheet (X30, manufactured by Toray Industries, Inc.) was prepared.
  • the PET sheet had a tensile stress at break at 180 MPa, an elongation at break at 138%, and a tensile modulus of elasticity of 4360 MPa.
  • the long sheet-shaped raw foam was cross-linked by irradiating 4.0 Mrad of an electron beam having an acceleration voltage of 500 kV to both surfaces thereof.
  • the cross-linked foam raw material is continuously fed into a foaming furnace maintained at 250 ° C. by hot air and an infrared heater to be heated and foamed.
  • the stretching was performed at a stretching ratio of 2.5 times.
  • a foam made of polyethylene resin having a thickness of 800 ⁇ m was obtained.
  • the density of the obtained PE foam base material 1 was measured using an electronic hydrometer (“ED120T” manufactured by Mirage Co., Ltd.) in accordance with JIS K-6767, and as a result, it was 0.07 g / cm 3 .
  • the 25% compressive strength of the obtained PE foam base material 1 was 55 kPa as a result of being measured according to JIS K 6254.
  • Second Resin Layer As the second resin layer, 5 parts by weight of styrene-acrylic block copolymer A in ethyl acetate was added to 100 parts by weight of styrene-acrylic block copolymer A.
  • a cross-linking agent was blended, coated on a 50 ⁇ m-thick polyethylene terephthalate (PET) sheet having a surface subjected to a release treatment, and dried to obtain a 50 ⁇ m-thick uncrosslinked resin film.
  • PET polyethylene terephthalate
  • As the cross-linking agent "Coronate L45" manufactured by Nippon Polyurethane Co., Ltd. was used.
  • styrene-acrylic block copolymer A in ethyl acetate, 5 parts by weight of a crosslinking agent was blended with respect to 100 parts by weight of styrene-acrylic block copolymer A, and the surface was subjected to release treatment to a thickness of 50 ⁇ m. It was applied on a polyethylene terephthalate (PET) sheet and dried. Thereafter, the sample was heated at 40 ° C. for 48 hours for thermal crosslinking to obtain a second resin film measurement sample having a thickness of 50 ⁇ m.
  • PET polyethylene terephthalate
  • the cross-linking agent "Coronate L45" manufactured by Nippon Polyurethane Co., Ltd. was used.
  • the obtained second resin film measurement sample was measured by a method according to JIS K7161 to find that the tensile break stress was 9.9 MPa, the tensile break elongation was 388%, and the tensile modulus was 7.6 MPa. Was.
  • the degree of crosslinking of the obtained second resin film measurement sample was 50% by weight. Further, when the surface of the obtained second resin film measurement sample was observed with an atomic force microscope (AFM, manufactured by Shimadzu Corporation, SPM-9700HT), a cylindrical phase-separated structure was observed.
  • AFM atomic force microscope
  • Adhesive Solution 52 parts by weight of ethyl acetate was placed in a reactor equipped with a thermometer, a stirrer, and a cooling tube, and the atmosphere was replaced with nitrogen. Then, the reactor was heated to start refluxing. After 30 minutes from the boiling of the ethyl acetate, 0.08 parts by weight of azobisisobutyronitrile was added as a polymerization initiator. A monomer mixture consisting of 70 parts by weight of butyl acrylate, 27 parts by weight of 2-ethylhexyl acrylate, 3 parts by weight of acrylic acid, and 0.2 parts by weight of 2-hydroxyethyl acrylate was uniformly and gradually dropped over 1 hour and 30 minutes. Reacted.
  • the above-mentioned pressure-sensitive adhesive solution is applied to a release-treated surface of a release liner made of polyethylene (PE) / high quality paper / polyethylene (PE) having been subjected to a release treatment with a thickness of 100 ⁇ m, and dried at 100 ° C. for 5 minutes.
  • a first pressure-sensitive adhesive layer having a thickness of 50 ⁇ m was formed.
  • the above-mentioned pressure-sensitive adhesive solution is applied to a release-treated surface of a release liner made of polyethylene (PE) / high quality paper / polyethylene (PE) having been subjected to a release treatment with a thickness of 100 ⁇ m, and dried at 100 ° C. for 5 minutes.
  • a second pressure-sensitive adhesive layer having a thickness of 50 ⁇ m was formed.
  • the release liner on which the second pressure-sensitive adhesive layer is formed is placed on the second resin layer-side surface of a laminate composed of the first resin layer (pressure-sensitive adhesive layer) / foam substrate / second resin layer. And the second pressure-sensitive adhesive layer is superimposed on the second resin layer side so that the first pressure-sensitive adhesive layer (pressure-sensitive adhesive layer) / the first resin layer / the foam base material / the second A laminate comprising the resin layer / second pressure-sensitive adhesive layer was obtained.
  • the first pressure-sensitive adhesive layer / first resin layer (pressure-sensitive adhesive layer) / foam base material / second resin layer / second pressure-sensitive adhesive layer And a double-sided pressure-sensitive adhesive tape having the surface of each pressure-sensitive adhesive layer covered with a release liner.
  • Examples 2 to 8 The same procedure as in Example 1 was carried out except that styrene-acrylic block copolymers B to H were used as the second resin film, and the thicknesses of the first and second pressure-sensitive adhesive layers were as shown in Table 2. To obtain a double-sided adhesive tape.
  • Example 9 Production of polyurethane (PU) foam base material
  • a polyol 90 parts by weight of a polyol component such as polypropylene glycol (PPG) (weight average molecular weight 800) and 10 parts by weight of neopentyl glycol (molecular weight 800), and an acid component
  • PPG polypropylene glycol
  • neopentyl glycol molecular weight 800
  • the solution is applied to a predetermined thickness on a 50 ⁇ m-thick PET separator (manufactured by Nipper Co., Ltd., V-2) using an applicator, and the foam material is reacted to form a foam (PU foam) made of a 800 ⁇ m-thick polyurethane resin.
  • Body substrate was obtained.
  • PU foam a foam made of a 800 ⁇ m-thick polyurethane resin.
  • Body substrate was obtained.
  • E120T electronic hydrometer
  • JIS K-6767 the 25% compressive strength of the obtained PU foam base material was 33 kPa as a result of being measured in accordance with JIS K 6254.
  • An uncrosslinked resin film is laminated on the foam base material side of the obtained laminate of the first resin layer / foam base material, and is composed of a first resin layer / foam base material / uncrosslinked resin film.
  • a laminate was formed.
  • a laminate composed of the first resin layer / foam base material / second resin film is obtained using the uncrosslinked resin film as the second resin film.
  • Example 1 was repeated except that the obtained first resin layer / foam base / second resin film was used as a laminate and the thickness of the first and second pressure-sensitive adhesive layers was as shown in Table 2.
  • Example 10 For the first resin layer and the second resin layer, 5 parts by weight of a crosslinking agent is mixed with 100 parts by weight of the styrene-acrylic block copolymer J in an ethyl acetate solution of the styrene-acrylic block copolymer J. Then, it was coated on a 50 ⁇ m-thick polyethylene terephthalate (PET) sheet having a surface subjected to a release treatment, and dried to obtain a 50 ⁇ m-thick uncrosslinked resin film.
  • PET polyethylene terephthalate
  • the cross-linking agent "Coronate L45" manufactured by Nippon Polyurethane Co., Ltd. was used.
  • An uncrosslinked resin film was laminated on both sides of the foam base obtained in the same manner as in Example 9 to form a laminate composed of an uncrosslinked resin film / foam base material / uncrosslinked resin film. Next, by heating at 40 ° C. for 48 hours to thermally crosslink, the first resin layer / the foam base material / the second resin film is used as the first resin film and the second resin film with the uncrosslinked resin film. Was obtained.
  • a first pressure-sensitive adhesive layer / a first resin layer / a first resin layer / a first resin layer / a first resin layer / a first resin layer / a first resin layer / a second resin film A double-sided pressure-sensitive adhesive tape having a foam base material / second resin layer / second pressure-sensitive adhesive layer and having the surface of each pressure-sensitive adhesive layer covered with a release liner was obtained.
  • Example 11 70 parts by weight of a linear low-density polyethylene (“Exact3027” manufactured by Exxon Chemical Co., density 0.900 g / cm 3 ) as a polyolefin resin, linear affinity low-density polyethylene (“Affinity KC8852” manufactured by Dow Chemical Co., density 0.875 g) / Cm 3 , melting point (DSC method: Tm: 66 ° C.) 30 parts by weight.
  • the linear low-density polyethylene (“Affinity KC8852” manufactured by Dow Chemical Company) was an ethylene-1-octene copolymer obtained using a metallocene compound polymerization catalyst. Further, the weight part of the foaming agent was changed to 7 weight parts.
  • a foam made of polyethylene resin having a thickness of 800 ⁇ m was obtained in the same manner as in Example 1 except for the above.
  • the density of the obtained PE foam base material 2 was 0.13 g / cm 3 as a result of being measured using an electronic hydrometer (manufactured by Mirage, “ED120T”) in accordance with JIS K-6767.
  • the 25% compressive strength of the obtained PE foam base material 1 was determined by measuring in accordance with JIS K 6254, and as a result, it was 91 kPa.
  • a double-sided pressure-sensitive adhesive tape was obtained in the same manner as in Example 1, except that the PE foam base material 2 was used as the foam base material, and the styrene-acrylic block copolymer K was used as the second resin film.
  • Example 1 A double-sided pressure-sensitive adhesive tape was obtained in the same manner as in Example 1, except that a PU foam substrate was used as the foam substrate and a styrene-acrylic block copolymer L was used as the second resin film.
  • Example 2 A double-sided pressure-sensitive adhesive tape was obtained in the same manner as in Example 1, except that the PE foam base material 1 was used as the foam base material and the acrylic copolymer was used as the second resin film.
  • Example 3 A double-sided pressure-sensitive adhesive tape was obtained in the same manner as in Example 1, except that the PE foam base material 1 was used as the foam base material, and the acrylic block copolymer was used as the second resin film.
  • Example 1 A double-sided pressure-sensitive adhesive tape was obtained in the same manner as in Example 1, except that a 50 ⁇ m-thick sheet made of a styrene-based triblock copolymer M (manufactured by Zeon Corporation, # 3620) was used as the second resin layer.
  • the styrene-based triblock copolymer M does not have a block containing an alkyl (meth) acrylate.
  • Double-sided pressure-sensitive adhesive tape (release liner / first pressure-sensitive adhesive layer / first resin layer / foam base material / second resin layer / second pressure-sensitive adhesive layer) ) was wound around a paper core having a diameter of 3 inches so that the second pressure-sensitive adhesive layer side was inside, to obtain a roll-shaped body. The side surface and the surface layer of the obtained roll were visually observed. Furthermore, after pulling out the double-sided pressure-sensitive adhesive tape from the roll-shaped body, it was visually observed from the second pressure-sensitive adhesive layer side, and evaluated according to the following criteria. :: No wrinkles or breaks were observed in all the confirmed locations. ⁇ : Wrinkles and breaks were observed in some of the confirmed locations. X: Wrinkles and breaks were observed at all the confirmed locations.
  • the obtained double-sided pressure-sensitive adhesive tape was cut into a size of 5 mm wide x 100 mm long and 10 mm wide x 100 mm long to prepare a 5 mm wide sample and a 10 mm wide sample.
  • the release liner on the first pressure-sensitive adhesive layer side of each of the obtained samples was peeled off, and the first pressure-sensitive adhesive layer side was stuck to a 2 mm-thick glass plate (width 50 mm, length 125 mm), and was placed on a double-sided pressure-sensitive adhesive tape. After reciprocating a 2 kg rubber roller once at a speed of 300 mm / min, it was left for 24 hours in an environment of 23 ° C. and 50% relative humidity.
  • the layers of the foam base material are torn apart, and the second pressure-sensitive adhesive layer, the second resin layer, and a part of the foam base material are removed from the double-sided pressure-sensitive adhesive tape, and then the remaining portion of the double-sided pressure-sensitive adhesive tape is removed.
  • the reworkability on the first pressure-sensitive adhesive layer side was evaluated according to the following criteria. The same evaluation was performed on the second pressure-sensitive adhesive layer side. :: The remaining portion of the double-sided adhesive tape could be removed. ⁇ : The double-sided pressure-sensitive adhesive tape was partially removed during the peeling, but could be removed. X: The remaining part of the double-sided adhesive tape could not be removed.
  • the obtained double-sided pressure-sensitive adhesive tape was cut out into a size of 10 mm wide ⁇ 220 mm long to prepare a sample.
  • the upper 10 mm of the obtained sample was fixed with a gripper, and the lower 10 mm was clipped. Each was fixed so that the distance between the gripper and the clip was 200 mm.
  • a 200 g weight was hung on the clip, and the clip was allowed to stand for 1 minute with the weight hung. Then, the weight was removed, and the elongation of the tape was measured.
  • the handleability of the double-sided pressure-sensitive adhesive tape was evaluated according to the following criteria. :: The elongation is less than 10 mm. ⁇ : The elongation is 10 mm or more.
  • the anchor properties of the double-sided pressure-sensitive adhesive tapes obtained in Examples 5 and 9 and Reference Example 1 were evaluated as follows. First, two polyethylene terephthalate (PET) sheets each having a thickness of 25 ⁇ m were prepared and cut into a size of 30 mm ⁇ 300 mm. The double-sided pressure-sensitive adhesive tape obtained in the above example (reference example) was cut into a size of 25 mm ⁇ 200 mm, and two prepared PET sheets were bonded to both sides of the double-sided tape, respectively, to obtain a measurement sample. At the time of lamination, a 30 mm ⁇ 100 mm grip was provided by arranging one short side of the double-sided tape so as to coincide with one short side of the PET sheet.
  • PET polyethylene terephthalate
  • a double-sided tape was disposed at the center of the PET sheet.
  • the sample was held in the T-shaped direction (90 ° direction) at a speed of 1000 mm / min with respect to the double-sided tape by holding the grip portion of the measurement sample.
  • the double-sided pressure-sensitive adhesive tapes of Examples 5 and 9 were used, breakage occurred between layers of the foam.
  • the double-sided pressure-sensitive adhesive tape of Reference Example 1 was used, it was peeled off at the interface between the foam and the laminated resin sheet layer before breaking.
  • a double-sided adhesive having excellent stress relaxation and impact resistance, excellent reworkability on both adhesive surfaces, and capable of being easily wound into a roll while suppressing wrinkles and breakage. Tape can be provided.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Adhesive Tapes (AREA)
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Cited By (8)

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JP2023054973A (ja) * 2021-10-05 2023-04-17 Dic株式会社 粘着テープ及びその製造方法、並びに該粘着テープを用いた物品及びその解体方法

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