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WO2023176964A1 - 接着方法及び誘導加熱用ホットメルト接着性フィルム - Google Patents

接着方法及び誘導加熱用ホットメルト接着性フィルム Download PDF

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Publication number
WO2023176964A1
WO2023176964A1 PCT/JP2023/010600 JP2023010600W WO2023176964A1 WO 2023176964 A1 WO2023176964 A1 WO 2023176964A1 JP 2023010600 W JP2023010600 W JP 2023010600W WO 2023176964 A1 WO2023176964 A1 WO 2023176964A1
Authority
WO
WIPO (PCT)
Prior art keywords
adherend
induction heating
thermoplastic resin
adhesive film
melt adhesive
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/JP2023/010600
Other languages
English (en)
French (fr)
Inventor
悠以子 丸山
俊輔 竹山
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.)
Zacros Corp
Original Assignee
Fujimori Kogyo 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 Fujimori Kogyo Co Ltd filed Critical Fujimori Kogyo Co Ltd
Priority to EP23770916.7A priority Critical patent/EP4494864A1/en
Priority to KR1020247034006A priority patent/KR20240159614A/ko
Priority to CN202380027276.6A priority patent/CN118786020A/zh
Priority to US18/847,977 priority patent/US20250197685A1/en
Publication of WO2023176964A1 publication Critical patent/WO2023176964A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/36—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction
    • 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
    • C09J7/35—Heat-activated
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    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/36—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction
    • B29C65/3604—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the type of elements heated by induction which remain in the joint
    • B29C65/3656—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the type of elements heated by induction which remain in the joint being a layer of a multilayer part to be joined, e.g. for joining plastic-metal laminates
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/82—Testing the joint
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    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
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    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/20—Adhesives in the form of films or foils characterised by their carriers
    • C09J7/28—Metal sheet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/832—Reciprocating joining or pressing tools
    • B29C66/8322—Joining or pressing tools reciprocating along one axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/84—Specific machine types or machines suitable for specific applications
    • B29C66/861—Hand-held tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/919—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux characterised by specific temperature, heat or thermal flux values or ranges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/94—Measuring or controlling the joining process by measuring or controlling the time
    • B29C66/949—Measuring or controlling the joining process by measuring or controlling the time characterised by specific time values or ranges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2705/00—Use of metals, their alloys or their compounds, for preformed parts, e.g. for inserts
    • B29K2705/02—Aluminium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2705/00—Use of metals, their alloys or their compounds, for preformed parts, e.g. for inserts
    • B29K2705/08—Transition metals
    • B29K2705/12—Iron
    • 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
    • C09J2301/1242—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 the opposite adhesive layers being different
    • 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
    • C09J2301/20—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive itself
    • C09J2301/208—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive itself the adhesive layer being constituted by at least two or more adjacent or superposed adhesive layers, e.g. multilayer adhesive
    • 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
    • C09J2301/304—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 the adhesive being heat-activatable, i.e. not tacky at temperatures inferior to 30°C
    • 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
    • C09J2400/00—Presence of inorganic and organic materials
    • C09J2400/10—Presence of inorganic materials
    • C09J2400/16—Metal
    • C09J2400/163—Metal in the substrate
    • 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
    • C09J2400/00—Presence of inorganic and organic materials
    • C09J2400/20—Presence of organic materials
    • C09J2400/22—Presence of unspecified polymer
    • C09J2400/226—Presence of unspecified polymer in the substrate
    • 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
    • C09J2423/00—Presence of polyolefin
    • 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
    • C09J2423/00—Presence of polyolefin
    • C09J2423/10—Presence of homo or copolymers of propene
    • 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
    • C09J2467/00—Presence of polyester

Definitions

  • the present invention relates to an adhesion method and a hot melt adhesive film for induction heating.
  • This application claims priority based on Japanese Patent Application No. 2022-044326 filed in Japan on March 18, 2022, the contents of which are incorporated herein.
  • a heat sealing (thermal fusion) method is known as a method for bonding adherends together.
  • Heat-sealing methods use, for example, films with a hot-melt (thermoplastic) adhesive layer. When such a film is interposed between adherends and then heated, the adhesive layer melts, and when heating is stopped, the adhesive layer solidifies and the adherends adhere to each other.
  • Patent Document 1 discloses a laminate including a polyolefin heat seal layer.
  • the adhesive strength tends to be low.
  • Different resins are resins that have different melting points and thermal conductivity, for example. In this case, the resin with a lower melting point or the resin with faster heat conduction melts first during heat sealing, causing a difference in mutual welding of the sealed portions and the degree of solidification.
  • the present invention has been made in view of the above circumstances, and an object of the present invention is to provide a bonding method that can firmly bond different resins together, and a hot melt adhesive film for induction heating used in the method.
  • the present invention employs the following configuration.
  • the hot melt adhesive film for induction heating has a thermoplastic resin layer (A') composed of a thermoplastic resin (A), a metal layer, and a thermoplastic resin composed of a thermoplastic resin (B).
  • a hot melt adhesive film for induction heating in which the layers (B') are laminated in this order, In the laminate, the adherend 1 and the thermoplastic resin layer (A') are in contact with each other, and the adherend 2 and the thermoplastic resin layer (B') are in contact with each other.
  • a hot melt adhesive film for induction heating that adheres an adherend 1 made of a resin (1) and an adherend 2 made of a resin (2) different from the resin (1).
  • the hot melt adhesive film for induction heating is a film in which a thermoplastic resin layer (A'), a metal layer, and a thermoplastic resin layer (B') are laminated in this order, and the thermoplastic resin layer
  • the thermoplastic resin (A) constituting (A') is a hot melt adhesive film for induction heating, which is a different resin from the thermoplastic resin (B) constituting the thermoplastic resin layer (B').
  • FIG. 3 is a schematic diagram for explaining the steps of the bonding method of the present embodiment.
  • FIG. 3 is a schematic diagram for explaining the steps of the bonding method of the present embodiment.
  • FIG. 1 is a schematic cross-sectional view of an example of a hot melt adhesive film for induction heating according to the present embodiment.
  • FIG. 2 is a schematic diagram for explaining a method of measuring shear strength.
  • Test piece A laminate in which adherend 1 and adherend 2, which will be described later, are bonded together by heating with a hot-melt adhesive film for induction heating. More specifically, the laminate shown in FIG. 4 was used as a test piece.
  • a test piece is a laminate in which the adherend 1 designated by the reference numeral 41, the hot melt adhesive film for induction heating designated by the reference numeral 43, and the adherend 2 designated by the reference numeral 42 are laminated in this order.
  • the shapes of adherend 1 and adherend 2 are respectively 25 mm in width, 50 mm in length, and 2 mm in thickness.
  • the shape of the hot melt adhesive film for induction heating is 25 mm in width, 15 mm in length, and 340 ⁇ m in thickness.
  • Test conditions For the laminate shown in FIG. 4, the shear strength is measured when the adherend 1 shown by reference numeral 41 and the adherend 2 shown by reference numeral 42 are simultaneously pulled at a tensile speed of 1 mm/min.
  • the tensile direction of the adherend 1 indicated by the reference numeral 41 is indicated as D1
  • the tensile direction of the adherend 2 indicated by the reference numeral 42 is indicated as D2.
  • the shear strength is 1.6 MPa or more and the peeling state is cohesive failure or no peeling, it is evaluated that "the adherends are firmly adhered to each other.” For example, even if the shear strength is 1.6 MPa or more, if the peeling state is interfacial peeling, the adhesion between the adherends is evaluated as insufficient.
  • an adherend 1 made of resin (1) and an adherend 2 made of resin (2) different from the resin (1) are bonded together using an induction heating device.
  • the bonding method of this embodiment includes a step of obtaining a laminate and a step of heating a hot melt adhesive film for induction heating. Each process of this embodiment will be explained below.
  • FIG. 1 shows a schematic cross-sectional view of the laminate 10.
  • an adherend 1, an induction heating hot melt adhesive film 20, and an adherend 2 are laminated in this order.
  • the hot melt adhesive film 20 for induction heating has a thermoplastic resin layer (A') 21, a metal layer 22, and a thermoplastic resin layer (B') 23 laminated in this order.
  • the adherend 1 is in contact with the surface 21a of the hot melt adhesive film 20 for induction heating
  • the adherend 2 is in contact with the surface 23a of the hot melt adhesive film 20 for induction heating.
  • the surface 21a is a surface opposite to the surface where the thermoplastic resin layer (A') 21 contacts the metal layer 22.
  • the surface 23a is a surface opposite to the surface where the thermoplastic resin layer (B') 23 contacts the metal layer 22.
  • thermoplastic resin layer (A') 21 is made of thermoplastic resin (A), and the thermoplastic resin layer (B') is made of thermoplastic resin (B).
  • thermoplastic resin layer (A') 21 is bonded to the adhesive layer 21b, and the thermoplastic resin layer (B' ) 23 changes into an adhesive layer 23b, and adherends 1 and 2 are bonded together.
  • the induction heating device 30 is pressed from the direction of the adherend 1, but the induction heating device 30 may be pressed from the direction of the adherend 2.
  • the induction heating device 30 for example, a portable electromagnetic induction heating machine manufactured by BROWNIE can be used.
  • the time for which the induction heating device 30 is pressed is about 5 seconds to 10 seconds. With this heating time, it is possible to bond the adherends 1 and 2 without causing damage due to heat.
  • the frequency of the induction heating device 30 may be appropriately set, for example, in the range of 3 kHz to 30 kHz.
  • the adherend 1 is made of resin (1).
  • resin (1) polyethylene (melting point 120°C), polypropylene (melting point 160°C), polyamide (melting point 225°C), polyethylene terephthalate (melting point 260°C), polybutylene terephthalate (melting point 223°C), polycarbonate (glass transition temperature 150°C), etc.
  • the shape of the adherend 1 is not particularly limited, but may be, for example, a plate shape with a thickness of 3 mm or more and 10 mm or less, or may have a desired three-dimensional shape.
  • the adherend 2 is made of resin (2).
  • Resin (2) is a resin that has a different melting point or glass transition temperature from the resin selected as resin (1) among the resins exemplified as resin (1) above.
  • the difference in melting point between resin (1) and resin (2) is, for example, 5°C or more, 10°C or more, 30°C or more, 50°C or more, 80°C or more, 100°C or more, or 120°C or more.
  • the shape of the adherend 2 is not particularly limited, but may have a thickness of, for example, 3 mm or more and 10 mm or less, or may have a desired three-dimensional shape.
  • Examples of combinations of adherend 1 and adherend 2 are shown below. - A combination of adherend 1 being polyethylene terephthalate and adherend 2 being polypropylene. - A combination of adherend 1 being polyethylene terephthalate and adherend 2 being polyethylene. - A combination of adherend 1 being polypropylene and adherend 2 being polyethylene. - A combination of adherend 1 being polybutylene terephthalate and adherend 2 being polypropylene. - A combination of adherend 1 being polybutylene terephthalate and adherend 2 being polyethylene. - A combination of adherend 1 being polycarbonate and adherend 2 being polypropylene.
  • an adherend 1 made of polyethylene with a melting point of 120°C and an adherend 2 made of polypropylene with a melting point of 160°C are bonded together by a conventional heat sealing method that includes an external heating step.
  • polyethylene which has a lower melting point, melts first, resulting in mutual welding of the seal parts and differences in the degree of solidification. Furthermore, if the heat necessary for adhering the adherend 2 is applied, the adherend 1 will be deformed.
  • bonding by heat sealing may not be applicable.
  • the bonding method of this embodiment uses the hot melt adhesive film for induction heating of this embodiment described later, and heats from the side of the hot melt adhesive film for induction heating by induction heating. Therefore, the adherend is not easily affected by heat, and even thick adherends or adherends that are sensitive to heat can be firmly bonded in a short time.
  • FIG. 3 shows a schematic cross-sectional view of an example of the hot melt adhesive film 20 for induction heating according to the present embodiment.
  • the hot melt adhesive film 20 for induction heating is a laminate in which a thermoplastic resin layer (A') 21, a metal layer 22, and a thermoplastic resin layer (B') 23 are laminated in this order.
  • the thermoplastic resin layer (A') 21 is composed of a resin different from the resin constituting the thermoplastic resin layer (B') 23.
  • the resins constituting the thermoplastic resin layer (A') 21 and the thermoplastic resin layer (B') 23 are selected in accordance with the composition of the resins constituting the adherends 1 and 2 to be adhered.
  • thermoplastic resin (A) constituting the thermoplastic resin layer (A') 21 is preferably the same type of resin as the resin constituting the adherend 1, and the thermoplastic resin constituting the thermoplastic resin layer (B') 23 (B) is preferably a resin of the same type as the resin constituting the adherend 2.
  • the "same type of resin” may be the same resin that is composed of the same components and has the same composition ratio, or may have different composition ratios as long as the main components are the same.
  • the adherend 1 is polypropylene and the adherend 2 is polyethylene
  • the resin constituting the thermoplastic resin layer (A') 21 is polypropylene
  • the resin constituting the thermoplastic resin layer (B') is polyethylene. do.
  • the thicknesses of the thermoplastic resin layer (A') 21 and the thermoplastic resin layer (B') 23 may be adjusted appropriately within the range of 20 ⁇ m or more and 200 ⁇ m or less, respectively.
  • the thickness of the thermoplastic resin layer (A') 21 and the thermoplastic resin layer (B') 23 may be the same or different. From the viewpoint of equalizing heat conduction from the metal layer 22, the thicknesses of the thermoplastic resin layer (A') 21 and the thermoplastic resin layer (B') 23 are preferably the same.
  • metal layer 22 for example, aluminum foil or stainless steel foil with a thickness of 10 ⁇ m or more and 80 ⁇ m or less can be used.
  • the method for producing the hot melt adhesive film for induction heating is not particularly limited.
  • a method of laminating a metal layer, a thermoplastic resin layer (A), and a thermoplastic resin layer (B) a metal layer, a film-like thermoplastic resin layer (A), and a film-like thermoplastic resin layer (B) are laminated.
  • Examples include a method of manufacturing by adhering them together by a dry lamination method, an extrusion lamination method, or the like.
  • Example 1 A polyethylene terephthalate plate as adherend 1 and a polypropylene plate as adherend 2 were adhered.
  • the adherend 1 and the adherend 2 each had a width of 25 mm, a length of 50 mm, and a thickness of 2 mm.
  • thermoplastic resin layer (A') is a polyester resin layer with a thickness of 150 ⁇ m
  • thermoplastic resin layer (B') is a polypropylene resin layer with a thickness of 150 ⁇ m
  • the shape is 25 mm wide, 15 mm long, and thick.
  • a hot melt adhesive film 1 for induction heating having a diameter of 340 ⁇ m was obtained.
  • Adherent 1, induction heating hot melt adhesive film 1, and adherend 2 were laminated in this order to obtain laminate 1.
  • the adherend 1 was in contact with the thermoplastic resin layer (A'), and the adherend 2 was in contact with the thermoplastic resin layer (B'). Thereafter, heating was performed for 6 seconds at a frequency of 20 kHz using an induction heating device (a portable electromagnetic induction heating device manufactured by BROWNIE) to bond adherend 1 and adherend 2 together.
  • an induction heating device a portable electromagnetic induction heating device manufactured by BROWNIE
  • Polyester (Modic GK320, manufactured by Mitsubishi Chemical Corporation) was laminated on both sides of a 40 ⁇ m thick aluminum foil to form a 150 ⁇ m thick resin layer to obtain a hot melt adhesive film 11 for induction heating.
  • thermoplastic resin layers (A') and (B') were both made of polyester, and the shape was 25 mm in width, 15 mm in length, and 340 ⁇ m in thickness.
  • Adherent 1, induction heating hot melt adhesive film 11, and adherend 2 were laminated in this order. Thereafter, heating was performed for 6 seconds at a frequency of 20 kHz using an induction heating device (a portable electromagnetic induction heating device manufactured by BROWNIE) to bond adherend 1 and adherend 2 together.
  • induction heating device a portable electromagnetic induction heating device manufactured by BROWNIE
  • the shear strength was 0.84 MPa, and interfacial peeling occurred between the adherend 1 and the polyester resin layer.
  • thermoplastic resin layers (A') and (B') were both made of polypropylene, and the shape was 25 mm in width, 15 mm in length, and 340 ⁇ m in thickness.
  • Adherent 1, hot melt adhesive film for induction heating 12, and adherend 2 were laminated in this order. Thereafter, heating was performed for 6 seconds at a frequency of 20 kHz using an induction heating device (a portable electromagnetic induction heating device manufactured by BROWNIE) to bond adherend 1 and adherend 2 together.
  • induction heating device a portable electromagnetic induction heating device manufactured by BROWNIE
  • the shear strength was 1.53 MPa, and interfacial peeling occurred between the adherend 1 and the polypropylene resin layer.
  • thermoplastic resin layer (A') and thermoplastic resin layer (B') of adherend 1, adherend 2, and hot melt adhesive film for induction heating were changed to the materials shown in Table 1 below.
  • Adherent 1 and adherend 2 were adhered by the same method as in Example 1, and the shear strength was measured to observe the state of peeling.
  • each abbreviation means the following material.
  • ⁇ PP Polypropylene
  • PE Polyethylene
  • PC Polycarbonate
  • Adherent Adherent
  • 10 Laminate
  • 20 Hot melt adhesive film for induction heating
  • 21 Thermoplastic resin layer (A')
  • 22 Metal layer
  • 23 Thermoplastic resin layer (B')
  • 21a Surface
  • 23a Surface
  • 30 Induction heating device

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Adhesive Tapes (AREA)
  • Laminated Bodies (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

樹脂（１）から構成される被着体１と、前記樹脂（１）とは異なる樹脂（２）から構成される被着体２とを接着する接着方法であって、前記被着体１、誘導加熱用ホットメルト接着性フィルム及び前記被着体２をこの順に積層し、積層物を得る工程と、誘導加熱装置を用いて前記誘導加熱用ホットメルト接着性フィルムを加熱する工程を有し、前記誘導加熱用ホットメルト接着性フィルムは、熱可塑性樹脂（Ａ）から構成される熱可塑性樹脂層（Ａ'）、金属層、及び熱可塑性樹脂（Ｂ）から構成される熱可塑性樹脂層（Ｂ'）がこの順に積層された、誘導加熱用ホットメルト接着性フィルムであって、前記積層物は、前記被着体１と前記熱可塑性樹脂層（Ａ'）とが接し、前記被着体２と前記熱可塑性樹脂層（Ｂ'）とが接している、接着方法。

Description

接着方法及び誘導加熱用ホットメルト接着性フィルム
　本発明は、接着方法及び誘導加熱用ホットメルト接着性フィルムに関する。
　本願は、２０２２年３月１８日に、日本に出願された特願２０２２－０４４３２６号に基づき優先権を主張し、その内容をここに援用する。
　被着体同士を接着させる方法として、ヒートシール（熱融着）方法が知られている。ヒートシール方法には、例えばホットメルト（熱可塑性）接着層を有するフィルムを使用する。このようなフィルムを被着体同士の間に介在させた後に加熱すると、接着層が溶融し、加熱を停止すると接着層が固化し、被着体同士が接着する。
　このようなフィルムとして、特許文献１は、ポリオレフィン系のヒートシール層を備える積層体を開示している。
国際公開第２０１９／０７８１３４号
　加熱により被着体同士を接着させるヒートシール法において、被着体として異なる樹脂同士を接着させる場合には、低接着強度となりやすい。異なる樹脂とは、例えば融点や熱伝導が異なる樹脂である。この場合、融点が低い樹脂又は熱伝導が速い樹脂の方がヒートシールする際に先に溶融し、シール部の相互溶着や、固化の程度に差が生じるためである。
　本発明は上記事情に鑑みてなされたものであって、異なる樹脂同士を強固に接着させることができる接着方法及びこれに用いる誘導加熱用ホットメルト接着性フィルムを提供することを目的とする。
　すなわち、本発明は以下の構成を採用した。
［１］樹脂（１）から構成される被着体１と、前記樹脂（１）とは異なる樹脂（２）から構成される被着体２とを接着する接着方法であって、前記被着体１、誘導加熱用ホットメルト接着性フィルム及び前記被着体２をこの順に積層し、積層物を得る工程と、誘導加熱装置を用いて前記誘導加熱用ホットメルト接着性フィルムを加熱する工程を有し、前記誘導加熱用ホットメルト接着性フィルムは、熱可塑性樹脂（Ａ）から構成される熱可塑性樹脂層（Ａ’）、金属層、及び熱可塑性樹脂（Ｂ）から構成される熱可塑性樹脂層（Ｂ’）がこの順に積層された、誘導加熱用ホットメルト接着性フィルムであって、
　前記積層物は、前記被着体１と前記熱可塑性樹脂層（Ａ’）とが接し、前記被着体２と前記熱可塑性樹脂層（Ｂ’）とが接している、接着方法。
［２］前記被着体１及び前記被着体２のいずれか一方又は両方は厚さが０．５ｍｍ以上１０ｍｍ以下である、［１］に記載の接着方法。
［３］樹脂（１）から構成される被着体１と、前記樹脂（１）とは異なる樹脂（２）から構成される被着体２とを接着させる誘導加熱用ホットメルト接着性フィルムであって、前記誘導加熱用ホットメルト接着性フィルムは、熱可塑性樹脂層（Ａ’）、金属層、及び熱可塑性樹脂層（Ｂ’）がこの順に積層されたフィルムであり、前記熱可塑性樹脂層（Ａ'）を構成する熱可塑性樹脂（Ａ）は、前記熱可塑性樹脂層（Ｂ’）を構成する熱可塑性樹脂（Ｂ）とは異なる樹脂である、誘導加熱用ホットメルト接着性フィルム。
　本発明によれば、異なる樹脂同士を強固に接着させることができる接着方法及びこれに用いる誘導加熱用ホットメルト接着性フィルムを提供することができる。
本実施形態の接着方法の工程を説明するための模式図である。 本実施形態の接着方法の工程を説明するための模式図である。 本実施形態の誘導加熱用ホットメルト接着性フィルムの一例の断面の模式図である。 せん断強度の測定方法を説明するための模式図である。
　本発明において、被着体同士が強固に接着しているか否かは、剥離状態の観察とせん断強度の測定により評価する。
［せん断強度の測定方法］
　試験片：後述する被着体１及び被着体２を誘導加熱用ホットメルト接着性フィルムで加熱接着した積層体。より具体的には、図４に示す積層体を試験片とする。図４中、符号４１で示す被着体１、符号４３で示す誘導加熱用ホットメルト接着性フィルム、符号４２で示す被着体２がこの順で積層された積層体を試験片とする。
　被着体１及び被着体２の形状は、それぞれ、幅２５ｍｍ、長さ５０ｍｍ、厚さ２ｍｍとする。誘導加熱用ホットメルト接着性フィルムの形状は、幅２５ｍｍ、長さ１５ｍｍ、厚さ３４０μｍとする。
　試験条件：図４に示す積層体について、符号４１で示す被着体１及び符号４２で示す被着体２をそれぞれ、引張速度１ｍｍ／分で同時に引張ったときのせん断強度を測定する。図４中、符号４１で示す被着体１の引張方向はＤ１、符号４２で示す被着体２の引張方向はＤ２と記載している。
　せん断強度が１．６ＭＰａ以上であって、剥離状態が凝集破壊又は剥離しない場合には、「被着体同士が強固に接着している」と評価する。例えばせん断強度が１．６ＭＰａ以上であっても、剥離状態が界面剥離の場合には、被着体同士の接着は不十分と評価する。
＜接着方法＞
　本実施形態は、樹脂（１）から構成される被着体１と、前記樹脂（１）とは異なる樹脂（２）から構成される被着体２とを、誘導加熱装置を用いて接着する接着方法である。
　本実施形態の接着方法は、積層物を得る工程と、誘導加熱用ホットメルト接着性フィルムを加熱する工程とを有する。
　以下、本実施形態の各工程について説明する。
≪積層物を得る工程≫
　まず、被着体１、誘導加熱用ホットメルト接着性フィルム２０及び被着体２をこの順に積層し、積層物１０を得る。図１に積層物１０の断面の模式図を示す。積層物１０は、被着体１、誘導加熱用ホットメルト接着性フィルム２０及び被着体２がこの順に積層されている。
　誘導加熱用ホットメルト接着性フィルム２０は、熱可塑性樹脂層（Ａ’）２１、金属層２２、及び熱可塑性樹脂層（Ｂ’）２３がこの順に積層されている。
　積層物１０は、被着体１が誘導加熱用ホットメルト接着性フィルム２０の面２１ａに接し、被着体２が誘導加熱用ホットメルト接着性フィルム２０の面２３ａに接している。
　面２１ａは、熱可塑性樹脂層（Ａ’）２１が金属層２２に接する面とは反対の面である。
　面２３ａは、熱可塑性樹脂層（Ｂ’）２３が金属層２２に接する面とは反対の面である。
　熱可塑性樹脂層（Ａ’）２１は熱可塑性樹脂（Ａ）から構成され、熱可塑性樹脂層（Ｂ’）は熱可塑性樹脂（Ｂ）から構成される。
≪誘導加熱用ホットメルト接着性フィルムを加熱する工程≫
　図２に示すように積層物１０に誘導加熱装置３０を押し当てて誘導加熱すると、金属層２２が発熱する。これに伴い、金属層２２に接する熱可塑性樹脂層（Ａ’）２１及び熱可塑性樹脂層（Ｂ’）２３が加熱されて溶融する。
　誘導加熱を停止すると、金属層２２の発熱が停止して温度が下がり、溶融した結晶性樹脂が固化し、熱可塑性樹脂層（Ａ’）２１が接着層２１ｂに、熱可塑性樹脂層（Ｂ’）２３が接着層２３ｂに変化して、被着体１と被着体２とが接着する。
　図２では被着体１の方向から誘導加熱装置３０を押し当てているが、被着体２の方向から誘導加熱装置３０を押し当ててもよい。
　誘導加熱装置３０としては、例えばＢＲＯＷＮＩＥ社製の携帯型電磁誘導加熱機が使用できる。
　誘導加熱装置３０を押し当てる時間は、５秒間から１０秒間程度である。この程度の加熱時間であれば、被着体１及び被着体２に熱によるダメージを与えることなく接着することができる。
　誘導加熱装置３０の周波数は、例えば３ｋＨｚ～３０ｋＨｚの範囲で適宜設定すればよい。
（被着体１）
　被着体１は、樹脂（１）から構成される。
　樹脂（１）としては、ポリエチレン（融点１２０℃）、ポリプロピレン（融点１６０℃）、ポリアミド（融点２２５℃）、ポリエチレンテレフタレート（融点２６０℃）、ポリブチレンテレフタレート（融点２２３℃）、ポリカーボネート（ガラス転移温度１５０℃）等が挙げられる。
　被着体１の形状は特に限定されないが、例えば厚さ３ｍｍ以上１０ｍｍ以下の板状であってもよく、所望の立体形状であってもよい。
　（被着体２）
　被着体２は、樹脂（２）から構成される。
　樹脂（２）は、上記樹脂（１）として例示した樹脂のうち、樹脂（１）として選択した樹脂とは融点又はガラス転移温度が異なる樹脂である。
　樹脂（１）と樹脂（２）との融点の差は、例えば５℃以上、１０℃以上、３０℃以上、５０℃以上、８０℃以上、１００℃以上、１２０℃以上である。
　被着体２の形状は特に限定されないが、例えば厚さが３ｍｍ以上１０ｍｍ以下であってもよく、所望の立体形状であってもよい。
　被着体１と被着体２の組み合わせを以下に例示する。
・被着体１がポリエチレンテレフタレート、被着体２がポリプロピレンの組み合わせ。
・被着体１がポリエチレンテレフタレート、被着体２がポリエチレンの組み合わせ。
・被着体１がポリプロピレン、被着体２がポリエチレンの組み合わせ。
・被着体１がポリブチレンテレフタレート、被着体２がポリプロピレンの組み合わせ。
・被着体１がポリブチレンテレフタレート、被着体２がポリエチレンの組み合わせ。
・被着体１がポリカーボネート、被着体２がポリプロピレンの組み合わせ。
　例えば融点が１２０℃のポリエチレンから構成される被着体１と、融点が１６０℃であるポリプロピレンから構成される被着体２とを、外部から加熱する工程を備える従来のヒートシール法により接着する場合、融点が低いポリエチレンが先に溶融し、シール部の相互溶着や、固化の程度に差が生じる。また、被着体２の接着に必要な熱を加えると、被着体１が変形してしまう。
　さらに、例えば数ｍｍ厚の厚い被着体や、熱に弱い被着体を接着する場合には、ヒートシールによる接着が適用できない場合がある。
　本実施形態の接着方法は、後述する本実施形態の誘導加熱用ホットメルト接着性フィルムを使用し、誘導加熱により誘導加熱用ホットメルト接着性フィルム側から加熱する。このため、被着体が熱の影響を受けにくく、厚い被着体や、熱に弱い被着体であっても短時間で強固に接着することができる。
　（誘導加熱用ホットメルト接着性フィルム）
　図３に本実施形態の誘導加熱用ホットメルト接着性フィルム２０の一例の断面の模式図を示す。
　誘導加熱用ホットメルト接着性フィルム２０は、熱可塑性樹脂層（Ａ’）２１、金属層２２及び熱可塑性樹脂層（Ｂ’）２３がこの順に積層された積層体である。
　熱可塑性樹脂層（Ａ’）２１は、熱可塑性樹脂層（Ｂ’）２３を構成する樹脂とは異なる樹脂から構成される。熱可塑性樹脂層（Ａ’）２１と、熱可塑性樹脂層（Ｂ’）２３を構成する樹脂は、接着する被着体１及び被着体２を構成する樹脂の構成に合わせて選択する。
　熱可塑性樹脂層（Ａ’）２１を構成する熱可塑性樹脂（Ａ）は、被着体１を構成する樹脂と同種の樹脂が好ましく、熱可塑性樹脂層（Ｂ’）２３を構成する熱可塑性樹脂（Ｂ）は、被着体２を構成する樹脂と同種の樹脂が好ましい。
　「同種の樹脂」とは、同じ成分によって構成され、組成比率も同じ同一の樹脂であってもよく、主成分が同じであれば、組成比率は異なっていてもよい。
　例えば被着体１がポリプロピレン、被着体２がポリエチレンである場合、熱可塑性樹脂層（Ａ’）２１を構成する樹脂はポリプロピレンとし、熱可塑性樹脂層（Ｂ’）を構成する樹脂はポリエチレンとする。
　熱可塑性樹脂層（Ａ’）２１及び熱可塑性樹脂層（Ｂ’）２３の厚さは、それぞれ２０μｍ以上２００μｍ以下の範囲で適宜調整すればよい。
　熱可塑性樹脂層（Ａ’）２１及び熱可塑性樹脂層（Ｂ’）２３の厚さは同一であってもよく異なっていてもよい。金属層２２からの熱伝導を同等にする観点から、熱可塑性樹脂層（Ａ’）２１及び熱可塑性樹脂層（Ｂ’）２３の厚さは同一であることが好ましい。
　金属層２２は、例えば厚さが１０μｍ以上８０μｍ以下のアルミニウム箔、ステンレス箔が使用できる。
（誘導加熱用ホットメルト接着性フィルムの製造方法）
　誘導加熱用ホットメルト接着性フィルムの製造方法は、特に限定されない。
　例えば、金属層と熱可塑性樹脂層（Ａ）及び熱可塑性樹脂層（Ｂ）を積層する方法として、金属層とフィルム状の熱可塑性樹脂層（Ａ）及びフィルム状の熱可塑性樹脂層（Ｂ）とを、ドライラミネート法、押出ラミネート法等により接着して製造する方法が挙げられる。
　以下、実施例として、より具体的に説明するが、本発明は、これらの実施例に限定されるものではない。
＜実験例１＞
　被着体１としてポリエチレンテレフタレート板と、被着体２としてポリプロピレン板とを接着した。被着体１及び被着体２は、それぞれ、幅２５ｍｍ、長さ５０ｍｍ、厚さ２ｍｍとした。
≪実施例１≫
　厚さ４０μｍのアルミニウム箔の片面にポリエステル系接着性樹脂（三菱ケミカル社製、モディックＧＫ３２０）を積層し、もう一方の面にポリプロピレン系接着性樹脂（三井化学製　アドマーＱＥ０６０）を積層した。これにより、熱可塑性樹脂層（Ａ’）が厚さ１５０μｍのポリエステル樹脂層、熱可塑性樹脂層（Ｂ’）が厚さ１５０μｍのポリプロピレン樹脂層であり、形状は、幅２５ｍｍ、長さ１５ｍｍ、厚さ３４０μｍである誘導加熱用ホットメルト接着性フィルム１を得た。
　被着体１、誘導加熱用ホットメルト接着性フィルム１及び被着体２をこの順で積層し、積層物１を得た。積層物１は、被着体１が熱可塑性樹脂層（Ａ’）に、被着体２が熱可塑性樹脂層（Ｂ’）に接していた。その後、誘導加熱装置（ＢＲＯＷＮＩＥ社製の携帯型電磁誘導加熱機）を用いて周波数２０ｋＨｚで６秒間加熱し、被着体１と被着体２とを接着した。
　誘導加熱用ホットメルト接着性フィルム１を使用した場合、せん断強度は１．９３ＭＰａであり、接着層のポリエステル樹脂層が凝集破壊していた。
≪比較例１≫
　厚さ４０μｍのアルミニウム箔の両面にポリエステル（三菱ケミカル社製、モディックＧＫ３２０）を積層し、厚さ１５０μｍの樹脂層を形成し、誘導加熱用ホットメルト接着性フィルム１１を得た。
　誘導加熱用ホットメルト接着性フィルム１１は、熱可塑性樹脂層（Ａ’）及び（Ｂ’）がともにポリエステルであり、形状は、幅２５ｍｍ、長さ１５ｍｍ、厚さ３４０μｍとした。
　被着体１、誘導加熱用ホットメルト接着性フィルム１１及び被着体２をこの順で積層した。その後、誘導加熱装置（ＢＲＯＷＮＩＥ社製の携帯型電磁誘導加熱機）を用いて周波数２０ｋＨｚで６秒間加熱し、被着体１と被着体２とを接着した。
　誘導加熱用ホットメルト接着性フィルム１１を使用した場合、せん断強度は０．８４ＭＰａであり、被着体１とポリエステル樹脂層との間で界面剥離していた。
≪比較例２≫
　厚さ４０μｍのアルミニウム箔の両面にポリプロピレン（三井化学社製、アドマーＱＥ０６０）を積層し、厚さ１５０μｍの樹脂層を形成し、誘導加熱用ホットメルト接着性フィルム１２を得た。
　誘導加熱用ホットメルト接着性フィルム１２は、熱可塑性樹脂層（Ａ’）及び（Ｂ’）がともにポリプロピレンであり、形状は、幅２５ｍｍ、長さ１５ｍｍ、厚さ３４０μｍとした。
　被着体１、誘導加熱用ホットメルト接着性フィルム１２及び被着体２をこの順で積層した。その後、誘導加熱装置（ＢＲＯＷＮＩＥ社製の携帯型電磁誘導加熱機）を用いて周波数２０ｋＨｚで６秒間加熱し、被着体１と被着体２とを接着した。
　誘導加熱用ホットメルト接着性フィルム１２を使用した場合、せん断強度は１．５３ＭＰａであり、被着体１とポリプロピレン樹脂層との間で界面剥離していた。
＜実験例２～５＞
　被着体１、被着体２、誘導加熱用ホットメルト接着性フィルムの熱可塑性樹脂層（Ａ’）熱可塑性樹脂層（Ｂ’）を下記表１にそれぞれ示す材料に変更した以外は、実験例１と同様の方法により被着体１と被着体２とを接着し、せん断強度を測定して剥離状態を観察した。
Figure JPOXMLDOC01-appb-T000001
　表１中、各略語は以下の材料を意味する。
・ＰＰ：ポリプロピレン
・ＰＥ：ポリエチレン
・ＰＣ：ポリカーボネート
　上記結果に示した通り、本発明の誘導加熱用ホットメルト接着性フィルムを使用し、本発明の接着方法により、融点が異なる樹脂から構成される被着体同士を短時間で強固に接着することができた。
１：被着体、２：被着体、１０：積層物、２０：誘導加熱用ホットメルト接着性フィルム、２１：熱可塑性樹脂層（Ａ’）、２２：金属層、２３：熱可塑性樹脂層（Ｂ’）、２１ａ：面、２３ａ：面、３０：誘導加熱装置

Claims (3)

  1. 　樹脂（１）から構成される被着体１と、前記樹脂（１）とは異なる樹脂（２）から構成される被着体２とを接着する接着方法であって、
    　前記被着体１、誘導加熱用ホットメルト接着性フィルム及び前記被着体２をこの順に積層し、積層物を得る工程と、
    　誘導加熱装置を用いて前記誘導加熱用ホットメルト接着性フィルムを加熱する工程を有し、
    　前記誘導加熱用ホットメルト接着性フィルムは、熱可塑性樹脂（Ａ）から構成される熱可塑性樹脂層（Ａ’）、金属層、及び熱可塑性樹脂（Ｂ）から構成される熱可塑性樹脂層（Ｂ’）がこの順に積層された、誘導加熱用ホットメルト接着性フィルムであって、
    　前記積層物は、前記被着体１と前記熱可塑性樹脂層（Ａ’）とが接し、前記被着体２と前記熱可塑性樹脂層（Ｂ’）とが接している、接着方法。
  2. 　前記被着体１及び前記被着体２のいずれか一方又は両方は厚さが０．５ｍｍ以上１０ｍｍ以下である、請求項１に記載の接着方法。
  3. 　樹脂（１）から構成される被着体１と、前記樹脂（１）とは異なる樹脂（２）から構成される被着体２とを接着させる誘導加熱用ホットメルト接着性フィルムであって、
    　前記誘導加熱用ホットメルト接着性フィルムは、熱可塑性樹脂層（Ａ’）、金属層、及び熱可塑性樹脂層（Ｂ’）がこの順に積層されたフィルムであり、
    　前記熱可塑性樹脂層（Ａ'）を構成する熱可塑性樹脂（Ａ）は、前記熱可塑性樹脂層（Ｂ’）を構成する熱可塑性樹脂（Ｂ）とは異なる樹脂である、誘導加熱用ホットメルト接着性フィルム。
PCT/JP2023/010600 2022-03-18 2023-03-17 接着方法及び誘導加熱用ホットメルト接着性フィルム Ceased WO2023176964A1 (ja)

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CN202380027276.6A CN118786020A (zh) 2022-03-18 2023-03-17 粘接方法及感应加热用热熔粘接性膜
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013023171A (ja) * 2011-07-26 2013-02-04 Meiwa Ind Co Ltd 車両用内装部品およびその製造方法
WO2019078134A1 (ja) 2017-10-17 2019-04-25 帝人フィルムソリューション株式会社 積層体
JP2022044326A (ja) 2020-09-07 2022-03-17 矢崎総業株式会社 端子及び端子対

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013023171A (ja) * 2011-07-26 2013-02-04 Meiwa Ind Co Ltd 車両用内装部品およびその製造方法
WO2019078134A1 (ja) 2017-10-17 2019-04-25 帝人フィルムソリューション株式会社 積層体
JP2022044326A (ja) 2020-09-07 2022-03-17 矢崎総業株式会社 端子及び端子対

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