JP2013116931A - Softener-containing polyethylene naphthalate film, softened polyethylene naphthalate film, insulating film with metal foil, method of manufacturing insulating film with metal foil, method of manufacturing laminated structure, and laminated structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a softener-containing polyethylene naphthalate film with which an insulating film with metal foil with high peel strength of the insulating film and the metal foil can be obtained.SOLUTION: The softener-containing polyethylene naphthalate film 31 has a polyethylene naphthalate film 2 that is an insulating film, and a softener contained in the polyethylene naphthalate film 2 on a first main surface 2a side of the polyethylene naphthalate film 2.

Description

  The present invention relates to a softener-containing polyethylene naphthalate film used by being laminated on a metal foil and a heat conductor having a thermal conductivity of 10 W / m · K or more. The present invention also includes a softened polyethylene naphthalate film using the softener-containing polyethylene naphthalate film, an insulating film with a metal foil, a method for producing an insulating film with a metal foil, a method for producing a laminated structure, and a laminated structure About the body.

  Optical semiconductor elements such as light emitting diode (LED) elements are widely used as light sources for display devices. An optical semiconductor device using an optical semiconductor element has low power consumption and long life. Moreover, the optical semiconductor device can be used even in a harsh environment. Accordingly, optical semiconductor devices are used in a wide range of applications such as mobile phone backlights, liquid crystal television backlights, automobile lamps, lighting fixtures, and signboards.

  When trying to emit light with the necessary brightness in LED lighting equipment and LCD TV backlight applications, the LED element generates more heat, shortening the life of the LED element or reducing the brightness. There is a problem of doing. In order to reduce the problem due to the heat generation, an insulating adhesive capable of effectively dissipating heat is used. In a conventional insulating adhesive, for example, an inorganic filler having a high thermal conductivity is dispersed in a resin.

  As an example of the insulating adhesive, Patent Document 1 below discloses an insulating adhesive containing an epoxy resin, aluminum nitride as an inorganic filler, a curing agent, and a phosphate ester as a dispersant. Yes.

Japanese Patent No. 3751271

  In an insulating film obtained by forming an insulating adhesive as described in Patent Document 1 in a film shape, a metal foil is laminated on one surface, and a thermal conductor having a thermal conductivity of 10 W / m · K or more on the other surface May be stacked. In such an application, the peel strength between the insulating film and the metal foil in the laminate of the metal foil and the insulating film or the laminate of the metal foil, the insulating film and the heat conductor may be low. For this reason, peeling between the insulating film and the metal foil may be a problem.

  Furthermore, the laminate may be used after being folded. Furthermore, when the laminate is used, vibration may be applied to the laminate and the laminate may be bent.

  When the laminate is obtained using a conventional insulating adhesive as described in Patent Document 1, if the laminate is bent or vibration is applied to the laminate, the insulating film is chipped. May occur or may crack. That is, there is a problem that the flexibility of the insulating film is low and the bending characteristics are not sufficient.

  Furthermore, when the said laminated body is obtained using the conventional insulating adhesive as described in patent document 1, the adhesiveness of the insulating film with respect to a heat conductor is low, and a heat conductor peels from an insulating film. There is.

  The objective of this invention is related with the softener containing polyethylene naphthalate film which can obtain the insulating film with metal foil with high peeling strength of an insulating film and metal foil. Further, the present invention provides a softened polyethylene naphthalate film using the softener-containing polyethylene naphthalate film, an insulating film with a metal foil, a method for producing an insulating film with a metal foil, a method for producing a laminated structure, and a laminated structure Is to provide a body.

  A limited object of the present invention is to provide a softener-containing polyethylene naphthalate film capable of obtaining a laminated structure having high adhesion between an insulating film and a heat conductor, and softening using the softener-containing polyethylene naphthalate film It is providing the processed polyethylene naphthalate film, the insulating film with metal foil, the manufacturing method of an insulating film with metal foil, the manufacturing method of a laminated structure, and a laminated structure.

  In addition, a limited object of the present invention is to obtain an insulating film with a metal foil that is less likely to be chipped and cracked and has excellent bending characteristics even when it is bent or given vibration. Softening agent-containing polyethylene naphthalate film, softened polyethylene naphthalate film using the softening agent-containing polyethylene naphthalate film, insulating film with metal foil, manufacturing method of insulating film with metal foil, manufacturing method of laminated structure And providing a laminated structure.

  Other limited objects of the present invention are a softener-containing polyethylene naphthalate film with less surface stickiness, a softened polyethylene naphthalate film using the softener-containing polyethylene naphthalate film, and an insulating film with a metal foil. It is providing the manufacturing method of an insulating film with metal foil, the manufacturing method of a laminated structure, and a laminated structure.

  According to a wide aspect of the present invention, a softener-containing polyethylene naphthalate film used by being laminated on a metal foil, which is an insulating film, and a first main surface side of the polyethylene naphthalate film And a softener-containing polyethylene naphthalate film having a softener contained in the polyethylene naphthalate film.

  The softening agent preferably contains a thermosetting composition or a compound that dissolves the polyethylene naphthalate film by heating.

  In a specific aspect of the softener-containing polyethylene naphthalate film according to the present invention, the polyethylene naphthalate film is a single layer.

  In another specific aspect of the softener-containing polyethylene naphthalate film according to the present invention, the polyethylene naphthalate film has a laminated structure of at least two layers, and is on the first main surface side of the polyethylene naphthalate film. The softener is contained in the disposed layer.

  In another specific aspect of the softener-containing polyethylene naphthalate film according to the present invention, the polyethylene naphthalate film has a second main surface side opposite to the first main surface side. Or having an adhesion improver that improves the adhesion of the polyethylene naphthalate film to the thermal conductor and is attached to the second main surface, and the polyethylene naphthalate film is The adhesion improver is contained in a layer having a laminated structure of at least two layers and disposed on the second main surface side of the polyethylene naphthalate film.

  In another specific aspect of the softener-containing polyethylene naphthalate film according to the present invention, in the polyethylene naphthalate film, on the second principal surface side opposite to the first principal surface side of the polyethylene naphthalate film, Or an adhesion improver that improves the adhesion of the polyethylene naphthalate film to the thermal conductor, and the polyethylene naphthalate film is at least The softener is contained in a layer having a three-layer laminated structure and disposed on the first main surface side of the polyethylene naphthalate film, and the second layer of the polyethylene naphthalate film. The adhesion improver is contained in the layer arranged on the main surface side.

  In another specific aspect of the softener-containing polyethylene naphthalate film according to the present invention, the polyethylene naphthalate film has a second main surface side opposite to the first main surface side. Or an adhesion improver that improves the adhesion of the polyethylene naphthalate film to the heat conductor and is attached to the second main surface.

  The adhesion improver preferably contains an organic aluminate compound, an organic titanate compound, an organic zirconate compound, or an organic silane compound.

  The softened polyethylene naphthalate film according to the present invention is obtained by heating the above-described softener-containing polyethylene naphthalate film, and the softener contains the first main surface of the polyethylene naphthalate film. Has been softened.

  The insulating film with a metal foil according to the present invention includes the above-mentioned polyethylene naphthalate film on the first main surface of the above-described softening agent-containing polyethylene naphthalate film containing the softening agent of the polyethylene naphthalate film. Obtained by softening the first main surface of the phthalate film and laminating a metal foil, the polyethylene naphthalate film as an insulating film and the first main surface of the polyethylene naphthalate film were laminated. Metal foil.

  Further, according to a wide aspect of the present invention, the softening agent-containing polyethylene naphthalate film is used for the first main surface containing the softening agent of the polyethylene naphthalate film. There is provided a method for producing an insulating film with a metal foil, comprising the step of softening the first main surface of the polyethylene naphthalate film and laminating a metal foil.

  In the method for producing a laminated structure according to the present invention, a metal foil is laminated on the first main surface of the polyethylene naphthalate film using the softener-containing polyethylene naphthalate film described above, and the polyethylene naphthalate A manufacturing method of a laminated structure for obtaining a laminated structure in which the heat conductor is laminated on a second main surface of a film, wherein a metal foil is disposed on the first main surface side of the polyethylene naphthalate film A heat conductor having a thermal conductivity of 10 W / m · K or more is disposed on the second main surface side of the polyethylene naphthalate film, and the metal foil, the polyethylene naphthalate film, and the heat conductor. Or a metal foil on the first main surface side of the polyethylene naphthalate film, and the metal foil and the polyethylene After integrating the phthalate film, a heat conductor having a thermal conductivity of 10 W / m · K or more is disposed on the second main surface side of the polyethylene naphthalate film, and the metal foil and the polyethylene are disposed. The naphthalate film and the heat conductor are integrated, or a heat conductor having a thermal conductivity of 10 W / m · K or more is disposed on the second main surface side of the polyethylene naphthalate film. After integrating the polyethylene naphthalate film and the heat conductor, a metal foil is disposed on the first main surface side of the polyethylene naphthalate film, and the metal foil and the polyethylene naphthalate film are The said heat conductor is integrated.

  The laminated structure according to the present invention is laminated on an insulating film with metal foil and a second main surface opposite to the first main surface on which the metal foil in the insulating film with metal foil is laminated. And a thermal conductor having a thermal conductivity of 10 W / m · K or more. In the laminated structure according to the present invention, the insulating film with metal foil is the insulating film with metal foil according to the present invention, or with the metal foil obtained by the method for producing an insulating film with metal foil according to the present invention. It is an insulating film.

  The softener-containing polyethylene naphthalate film according to the present invention includes a polyethylene naphthalate film which is an insulating film, and a softener contained in the polyethylene naphthalate film on the first main surface side of the polyethylene naphthalate film. Therefore, the first main surface of the polyethylene naphthalate film is softened by the softening agent, and a metal foil is laminated on the first main surface of the polyethylene naphthalate film in the softening agent-containing polyethylene naphthalate film. Thus, the peel strength between the polyethylene naphthalate film and the metal foil can be increased.

  In the insulating film with metal foil according to the present invention, the first main surface of the polyethylene naphthalate film is added to the first main surface of the polyethylene naphthalate film in the softener-containing polyethylene naphthalate film by the softener. Since it is obtained by softening the surface and laminating the metal foil, the peel strength between the polyethylene naphthalate film and the metal foil can be increased.

  In the method for producing an insulating film with metal foil according to the present invention, the first surface of the polyethylene naphthalate film in the softener-containing polyethylene naphthalate film is formed on the first main surface of the polyethylene naphthalate film by the softener. Since the main surface of 1 is softened and the metal foil is laminated, the peel strength between the polyethylene naphthalate film and the metal foil can be increased.

FIG. 1 is a partially cutaway front sectional view schematically showing a softener-containing polyethylene naphthalate film according to a first embodiment of the present invention. FIG. 2 is a partially cutaway front sectional view schematically showing a softener-containing polyethylene naphthalate film according to a second embodiment of the present invention. FIG. 3 is a partially cutaway front sectional view schematically showing a softener-containing polyethylene naphthalate film according to a third embodiment of the present invention. FIG. 4 is a partially cutaway front sectional view schematically showing a softener-containing polyethylene naphthalate film according to a fourth embodiment of the present invention. FIG. 5 is a partially cutaway front sectional view schematically showing an insulating film with metal foil according to an embodiment of the present invention. 6 is a cross-sectional view schematically showing a laminated structure using the insulating film with metal foil shown in FIG. FIG. 7 is a partially cutaway cross-sectional view schematically showing another example of a laminated structure using the insulating film with metal foil shown in FIG. FIG. 8 is a partially cutaway front sectional view schematically showing an insulating film with metal foil according to another embodiment of the present invention.

  Hereinafter, the present invention will be clarified by describing specific embodiments and examples of the present invention with reference to the drawings.

(Softening agent-containing polyethylene naphthalate film and surface-softened polyethylene naphthalate film)
In FIG. 1, the softener containing polyethylene naphthalate film which concerns on the 1st Embodiment of this invention is typically shown with a partially notched cross-sectional view.

  A softener-containing polyethylene naphthalate film 31 shown in FIG. 1 is used by being laminated on a metal foil. The softener-containing polyethylene naphthalate film 31 is preferably used by being laminated on a metal foil and a thermal conductor having a thermal conductivity of 10 W / m · K or more. The softener-containing polyethylene naphthalate film 31 has a single-layer polyethylene naphthalate film 2.

  The single layer polyethylene naphthalate film 2 contains a polyethylene naphthalate resin.

  The single-layer polyethylene naphthalate film 2 has a softener (not shown) contained in the polyethylene naphthalate film 2 on the first main surface 2a side of the polyethylene naphthalate film 2. A softener is contained on the surface on the first main surface 2a side. The entire polyethylene naphthalate film 2 contains a softening agent. The softener-containing polyethylene naphthalate film 31 may have an adhesion improver contained in the polyethylene naphthalate film 2 on the first main surface 2 a side of the polyethylene naphthalate film 2.

  On the second main surface 2 b side of the single layer polyethylene naphthalate film 2, the polyethylene naphthalate film 2 has an adhesion improver contained in the polyethylene naphthalate film 2. An adhesion improver is included in the surface on the second main surface 2b side. The entire polyethylene naphthalate film 2 contains an adhesion improver. However, the softener-containing polyethylene naphthalate film 31 may not necessarily have an adhesion improver. The softener-containing polyethylene naphthalate film 31 may have a softener contained in the polyethylene naphthalate film 2 on the second main surface 2 b side of the polyethylene naphthalate film 2.

  In FIG. 2, the softener containing polyethylene naphthalate film which concerns on the 2nd Embodiment of this invention is typically shown with a partially notched cross-sectional view.

  A softener-containing polyethylene naphthalate film 41 shown in FIG. 2 is used by being laminated on a metal foil. The softener-containing polyethylene naphthalate film 41 is preferably used by being laminated on a metal foil and a thermal conductor having a thermal conductivity of 10 W / m · K or more. The softener-containing polyethylene naphthalate film 41 has a multilayer polyethylene naphthalate film 42. Specifically, the polyethylene naphthalate film 42 has a three-layer laminated structure. Thus, the polyethylene naphthalate film may have a laminated structure of two or more layers.

  The polyethylene naphthalate film 42 includes a first layer 42A arranged on the first main surface 42a side and a second main surface 42b side opposite to the first main surface 42a side. A layer 42B, and a third layer 42C disposed between the first layer 42A and the second layer 42B. Each of the first layer 42A, the second layer 42B, and the third layer 42C includes a polyethylene naphthalate resin.

  The softener-containing polyethylene naphthalate film 41 has a softener (not shown) contained in the polyethylene naphthalate film 42 on the first main surface 42 a side of the polyethylene naphthalate film 42. A softening agent is contained in the surface of the first main surface 42a. In the softener-containing polyethylene naphthalate film 41, the softener is included in the first layer 42A. That is, the first layer 42A contains a softening agent. The first layer 42A may contain an adhesion improver.

  The softener-containing polyethylene naphthalate film 41 has an adhesion improver (not shown) contained in the polyethylene naphthalate film 42 on the second main surface 42 b side of the polyethylene naphthalate film 42. An adhesion improver is included on the surface of the second main surface 42b. In the softener-containing polyethylene naphthalate film 41, an adhesion improver is included in the second layer 42B. That is, the second layer 42B contains an adhesion improver. However, the softener-containing polyethylene naphthalate film 41 may not necessarily have an adhesion improver. The second layer 42B may contain a softening agent.

  In the softener-containing polyethylene naphthalate film 41, the third layer 42C does not contain a softener and does not contain an adhesion improver. However, the third layer 42C may contain a softener and may contain an adhesion improver.

  In FIG. 3, the softener containing polyethylene naphthalate film which concerns on the 3rd Embodiment of this invention is typically shown with a partially notched cross-sectional view.

  A softener-containing polyethylene naphthalate film 51 shown in FIG. 3 is used by being laminated on a metal foil. The softener-containing polyethylene naphthalate film 51 is preferably used by being laminated on a metal foil and a thermal conductor having a thermal conductivity of 10 W / m · K or more. The softener-containing polyethylene naphthalate film 51 includes a multilayer polyethylene naphthalate film 52. Specifically, the polyethylene naphthalate film 52 has a two-layer laminated structure.

  The polyethylene naphthalate film 52 includes a first layer 52A disposed on the first main surface 52a side, and a second layer 52b disposed on the second main surface 52b side opposite to the first main surface 52a side. Layer 52B. The first layer 52A and the second layer 52B each include a polyethylene naphthalate resin.

  The softener-containing polyethylene naphthalate film 51 has a softener (not shown) contained in the polyethylene naphthalate film 52 on the first main surface 52 a side of the polyethylene naphthalate film 52. A softening agent is included in the surface of the first main surface 52a. In the softener-containing polyethylene naphthalate film 51, the softener is included in the first layer 52A. That is, the first layer 52A includes a softening agent. The first layer 52A may contain an adhesion improver.

  The softener-containing polyethylene naphthalate film 51 has an adhesion improver (not shown) contained in the polyethylene naphthalate film 52 on the second main surface 52 b side of the polyethylene naphthalate film 52. An adhesion improver is included in the surface of the second main surface 52b. In the softener-containing polyethylene naphthalate film 51, an adhesion improver is included in the second layer 52B. That is, the second layer 52B includes an adhesion improver. However, the softener-containing polyethylene naphthalate film 51 may not necessarily have an adhesion improver. The second layer 52B may contain a softening agent.

  In FIG. 4, the softener containing polyethylene naphthalate film which concerns on the 4th Embodiment of this invention is typically shown with a partially notched cross-sectional view.

  A softener-containing polyethylene naphthalate film 61 shown in FIG. 4 is used by being laminated on a metal foil. The softener-containing polyethylene naphthalate film 61 is preferably used by being laminated on a metal foil and a thermal conductor having a thermal conductivity of 10 W / m · K or more. The softener-containing polyethylene naphthalate film 61 has a single-layer polyethylene naphthalate film 62. The single layer polyethylene naphthalate film 62 contains a polyethylene naphthalate resin.

  The single layer polyethylene naphthalate film 62 has a softener (not shown) contained in the polyethylene naphthalate film 62 on the first main surface 62 a side of the polyethylene naphthalate film 62. A softening agent is included in the surface of the first main surface 62a. The entire polyethylene naphthalate film 62 contains a softening agent. The polyethylene naphthalate film 62 may contain an adhesion improver.

  The softener-containing polyethylene naphthalate film 61 further has an adhesion improver 63 attached to the second main surface 62 b side of the polyethylene naphthalate film 62. As described above, the adhesion improver is not contained in the polyethylene naphthalate film on the second main surface side, and may adhere to the second main surface.

  The first material containing the softening agent contained in the polyethylene naphthalate film on the first main surface side may contain an adhesion improver. The 2nd material containing the said adhesive improvement agent contained in the 2nd main surface side of the polyethylene naphthalate film or adhering to the 2nd main surface may contain the softening agent. The composition of the first material and the composition of the second material may be the same or different. When the composition of the first material and the composition of the second material are the same, the production efficiency for obtaining the softener-containing polyethylene naphthalate film is increased.

  The second main surface opposite to the first main surface of the polyethylene naphthalate film is preferably a surface on which a heat conductor having a thermal conductivity of 10 W / m · K or more is laminated.

  Since the polyethylene naphthalate film according to the present invention has the above-described configuration, a softening agent is contained in the polyethylene naphthalate film particularly on the first main surface side. By peeling the first main surface and laminating the metal foil on the softened first main surface, the peel strength between the polyethylene naphthalate film and the metal foil can be increased. By using such a softening agent, the first main surface of the polyethylene naphthalate film can be softened by heating at the time of laminating the metal foil. As a result, the peel strength between the polyethylene naphthalate film and the metal foil can be increased. It can be further increased. That is, the softening agent plays a role of increasing the peel strength between the polyethylene naphthalate film and the metal foil.

  In addition, the said 1st material containing the softening agent contained in the polyethylene naphthalate film by the 1st main surface side may contain the adhesive improvement agent. In this case, the peel strength between the polyethylene naphthalate film and the metal foil is further increased.

  Further, in the softener-containing polyethylene naphthalate film according to the present invention, an adhesion improver is contained in the polyethylene naphthalate film on the second main surface side, or an adhesion improver on the second main surface. Is preferably attached. In this case, when the heat conductor is laminated on the second main surface of the polyethylene naphthalate film, the adhesion between the polyethylene naphthalate film and the heat conductor can be improved, and the polyethylene of the heat conductor Peeling from the naphthalate film can be suppressed.

  In addition, the 2nd material containing the adhesive improvement agent contained or adhering to the 2nd main surface side of a polyethylene naphthalate film is a softener which softens the 2nd main surface of a polyethylene naphthalate film. May be included. In this case, the adhesion between the polyethylene naphthalate film and the heat conductor is further enhanced.

  Further, in the softener-containing polyethylene naphthalate film according to the present invention, since the insulating film is a polyethylene naphthalate film containing a polyethylene naphthalate resin, the insulating film can be bent or vibrated. Chipping and cracking can be made difficult to occur.

  Further, by heating the softener-containing polyethylene naphthalate film, a softened polyethylene naphthalate film in which the first main surface of the polyethylene naphthalate film is softened by the softener is obtained. In the softened polyethylene naphthalate film, the component derived from the softening agent after heating is preferably contained in the polyethylene naphthalate film on the first main surface side. That is, it is preferable that the component derived from the softening agent after heating is contained on the surface of the first main surface of the polyethylene naphthalate film. The softened polyethylene naphthalate film may be cured to some extent after the first main surface is once softened.

  In the softened polyethylene naphthalate film, it is preferable that the component derived from the adhesion improving agent after heating is contained in the polyethylene naphthalate film on the second main surface side. That is, it is preferable that the component derived from the adhesive improvement agent after a heating is contained in the surface of the 2nd main surface of a polyethylene naphthalate film. Note that the softened polyethylene naphthalate film may be cured to some extent after the second main surface is once softened.

  From the viewpoint of further increasing the peel strength between the polyethylene naphthalate film and the metal foil, the softening agent contained in the first material and the softening agent that may be contained in the second material are: Each preferably contains a thermosetting composition or a compound that dissolves the polyethylene naphthalate film by heating. From the viewpoint of further improving the adhesion between the polyethylene naphthalate film and the thermal conductor, the second material includes a thermosetting composition or a compound that dissolves the polyethylene naphthalate film by heating. It is preferable to contain. Each of the first and second materials preferably includes a thermosetting composition. Each of the first and second materials preferably contains both a thermosetting composition and a compound that dissolves the polyethylene naphthalate film by heating.

  From the viewpoint of further increasing the peel strength between the polyethylene naphthalate film and the metal foil, the thermosetting composition preferably contains a thermosetting compound and a curing agent. From the viewpoint of further improving the adhesion between the polyethylene naphthalate film and the thermal conductor, the thermosetting composition preferably includes a thermosetting compound and a curing agent.

  Examples of the thermosetting compound include oxetane compounds, epoxy compounds, episulfide compounds, (meth) acrylic compounds, phenol compounds, amino compounds, unsaturated polyester compounds, polyurethane compounds, silicone compounds, polyimide compounds, bismaleimide compounds, benzoxazine compounds. And triisocyanurate compounds. The thermosetting compound is preferably an epoxy compound. As for the said thermosetting compound, only 1 type may be used and 2 or more types may be used together.

  The thermosetting compound may be liquid at 23 ° C. or solid at 23 ° C. The thermosetting compound preferably includes a thermosetting compound that is solid at 23 ° C. By using a thermosetting compound that is solid at 23 ° C., stickiness of the first main surface containing the softening agent can be suppressed, and further, the adhesion improver is contained or adhered. The stickiness of the main surface of 2 can be suppressed. As a result, the handleability of the softener-containing polyethylene naphthalate film is improved. Furthermore, it is easy to stick a release film on the surface of the softener-containing polyethylene naphthalate film by suppressing the stickiness of the surface of the softener-containing polyethylene naphthalate film. Furthermore, the softener-containing polyethylene naphthalate film can be favorably peeled from the release film during use.

  Specific examples of the epoxy compound include bisphenol A type epoxy compound, bisphenol F type epoxy compound, bisphenol S type epoxy compound, glycidyl ester type epoxy compound, glycidyl ether type epoxy compound, bixylenol type epoxy compound, biphenol type epoxy compound, Tetraglycidylxylenoylethane compound, phenol novolac type epoxy compound, cresol novolac type epoxy compound, chelate type epoxy compound, glyoxal type epoxy compound, amino group-containing epoxy compound, rubber modified epoxy compound, dicyclopentadiene type epoxy compound, silicone modified Epoxy compound, ε-caprolactone modified epoxy compound, triazine type epoxy compound and naphthalene skeleton-containing epoxy compound Etc. The.

  The thermosetting compound preferably contains a bisphenol A type epoxy compound. By using the bisphenol A type epoxy compound, the peel strength between the polyethylene naphthalate film and the metal foil is considerably increased.

  The peel strength between the polyethylene naphthalate film and the metal foil is further increased, the adhesion between the polyethylene naphthalate film and the heat conductor is further increased, and the surface of the softener-containing polyethylene naphthalate film From the viewpoint of effectively suppressing stickiness, the thermosetting compound is preferably an epoxy compound that is solid at 23 ° C.

  From the viewpoint of further increasing the peel strength between the polyethylene naphthalate film and the metal foil, and further enhancing the adhesion between the polyethylene naphthalate film and the thermal conductor, the thermosetting compound is bisphenol A. It is preferable that it is a type epoxy compound or a dicyclopentadiene type epoxy compound.

  Examples of the curing agent include a cyanate ester compound (cyanate ester curing agent), a phenol compound (phenol curing agent), an amine compound (amine curing agent), a thiol compound (thiol curing agent), an imidazole compound, a phosphine compound, and an acid anhydride ( Acid anhydride curing agent), active ester compounds and dicyandiamide. As for the said hardening | curing agent, only 1 type may be used and 2 or more types may be used together.

  The curing agent may be liquid at 23 ° C. or solid at 23 ° C. It is preferable that the said hardening | curing agent contains the hardening | curing agent which is solid at 23 degreeC. By using a curing agent that is solid at 23 ° C., stickiness of the surface of the softener-containing polyethylene naphthalate film can be suppressed. As a result, the handleability of the softener-containing polyethylene naphthalate film is improved. Furthermore, it is easy to stick a release film on the surface of the softener-containing polyethylene naphthalate film by suppressing the stickiness of the surface of the softener-containing polyethylene naphthalate film. Furthermore, the softener-containing polyethylene naphthalate film can be favorably peeled from the release film during use.

  The curing agent preferably contains an acid anhydride curing agent or a phenol curing agent. By using an acid anhydride curing agent or a phenol curing agent, the peel strength between the polyethylene naphthalate film and the metal foil is considerably increased, and the adhesion between the polyethylene naphthalate film and the thermal conductor is even higher. Become. From the viewpoint of further enhancing the peel strength between the polyethylene naphthalate film and the metal foil, and further enhancing the adhesion between the polyethylene naphthalate film and the thermal conductor, the curing agent is a phenol curing agent. More preferably.

  A viewpoint of effectively softening the polyethylene naphthalate film, further increasing the peel strength between the polyethylene naphthalate film and the metal foil, and further enhancing the adhesion between the polyethylene naphthalate film and the thermal conductor. From the above, the curing agent is preferably an acid anhydride curing agent, more preferably an acid anhydride curing agent having an alicyclic skeleton. If the softening effect is high, the pressure required at the time of application to obtain the same peel strength is reduced, and the product area obtained when the same apparatus is used is increased.

  Commercially available acid anhydride curing agents having an alicyclic skeleton include Ricacid HNA and Ricacid HNA-100 (all of which are manufactured by Shin Nippon Chemical Co., Ltd.), YH306, YH307, YH308 and YH309 (and all of which are Mitsubishi). Chemical Co., Ltd.).

  A viewpoint of effectively softening the polyethylene naphthalate film, further increasing the peel strength between the polyethylene naphthalate film and the metal foil, and further enhancing the adhesion between the polyethylene naphthalate film and the thermal conductor. From the above, the curing agent having an alicyclic skeleton is preferably an acid anhydride curing agent represented by any one of the following formulas (1) to (4), and the following formula (1) or ( The acid anhydride curing agent represented by 4) is more preferable.

  In said formula (4), R1 and R2 show a hydrogen atom, a C1-C5 alkyl group, or a hydroxyl group, respectively.

  When the curing agent is a phenol curing agent, the phenol curing agent is preferably o, o'-diallylbisphenol A. By using o, o′-diallylbisphenol A, the peel strength between the polyethylene naphthalate film and the metal foil is further increased, and the adhesion between the polyethylene naphthalate film and the heat conductor is further enhanced. Become.

  Examples of commercially available o, o'-diallylbisphenol A include "5292B" manufactured by Huntsman.

  When the thermosetting compound and the curing agent are used in combination, the content of the curing agent is preferably 0.01 parts by weight or more, more preferably 0 with respect to 100 parts by weight of the thermosetting compound. .1 part by weight or more, more preferably 1 part by weight or more, preferably 200 parts by weight or less, more preferably 150 parts by weight or less, still more preferably 100 parts by weight or less. When the content of the curing agent is not less than the above lower limit and not more than the above upper limit, the peel strength between the polyethylene naphthalate film and the metal foil is further increased, and the adhesion between the polyethylene naphthalate film and the heat conductor is increased. The nature becomes even higher.

  Examples of the compound that dissolves the polyethylene naphthalate film include polyfunctional phenol novolac, allylphenol novolac, and allylphenol. By using such a compound, the first main surface of the polyethylene naphthalate film can be dissolved and softened by heating during lamination of the metal foil. Preferably, the compound that dissolves the polyethylene naphthalate film softens the first main surface by dissolving the polyethylene naphthalate film by heating during lamination of the metal foil. When the softening agent is contained in the polyethylene naphthalate film on the second main surface side, the second main surface of the polyethylene naphthalate film is dissolved by heating at the time of laminating the metal foil. Can be softened. The compound that dissolves the polyethylene naphthalate film preferably softens the second main surface by dissolving the polyethylene naphthalate film by heating at the time of laminating the metal foil. Only 1 type may be used for the compound which dissolves the said polyethylene naphthalate film by heating, and 2 or more types may be used together.

  The adhesion improver is not particularly limited as long as it can improve the adhesion of the polyethylene naphthalate film to the heat conductor. The adhesion imparting agent preferably contains an organometallic compound. Examples of the organometallic compound include organic aluminate compounds, organic titanate compounds, organic zirconate compounds, and organic silane compounds. From the viewpoint of effectively increasing the adhesion between the heat conductor and the polyethylene naphthalate film, the adhesion improver preferably contains an organic aluminate compound, an organic titanate compound, an organic zirconate compound, or an organic silane compound. . By using these specific organometallic compounds, the adhesion of the polyethylene naphthalate film to the heat conductor is considerably increased. As for the said organometallic compound, only 1 type may be used and 2 or more types may be used together.

  From the viewpoint of further improving the adhesion of the polyethylene naphthalate film to the heat conductor, the organometallic compound preferably has an alkoxy group or a chelate structure, and an organic titanate compound having an alkoxy group or a chelate structure, an alkoxy An organic zirconate compound having a group or chelate structure, an organic aluminate compound having an alkoxy group or chelate structure, or an alkoxy group or chelate structure and an organic silane compound are preferred. In addition, from the viewpoint of further improving the adhesion of the polyethylene naphthalate film to the heat conductor, the organometallic compound is preferably an organic aluminate compound, an organic titanate compound, or an organic zirconate compound, An organic zirconate compound is more preferable, and an organic aluminate compound is particularly preferable.

  Preferred organic aluminate compounds include trimethoxyaluminum, triethoxyaluminum, tri-n-propoxyaluminum, triisopropoxyaluminum, tri-n-butoxyaluminum and acetoalkoxyaluminum diisopropylate, and polymers thereof. . Organic aluminate compounds other than these may be used.

  Preferred organic titanate compounds include tetramethoxy titanium, tetraethoxy titanium, tetra n-propoxy titanium, tetraisopropoxy titanium, tetra n-butoxy titanium, tetrakis (2-ethylhexyloxy) titanium and titanium-isopropoxy octylene glycolate. And polymers thereof. Organic titanate compounds other than these may be used.

  Preferred examples of the organic zirconate compound include zirconium tetramethoxide, zirconium tetraethoxide, zirconium tetraisopropoxide, zirconium tetra n-butoxide, and polymers thereof. Organic zirconate compounds other than these may be used.

  Preferred organic silane compounds include vinyl silane compounds, hexyl silane compounds, and amino silane compounds. Organic silane compounds other than these may be used.

  When the thermosetting compound and the organometallic compound are used in combination, the content of the organometallic compound is preferably 0.001 part by weight or more, more preferably 100 parts by weight of the thermosetting compound. Is 0.01 parts by weight or more, more preferably 0.1 parts by weight or more, preferably 20 parts by weight or less, more preferably 10 parts by weight or less, and still more preferably 5 parts by weight or less. The adhesiveness of the polyethylene naphthalate film with respect to a heat conductor becomes still higher that content of the said organometallic compound is more than the said minimum and below the said upper limit.

  The method for producing the softener-containing polyethylene naphthalate film according to the present invention is not particularly limited. As a method for producing the softener-containing polyethylene naphthalate film, for example, a pellet of polyethylene naphthalate resin, a softener, and other components blended as necessary are kneaded to form a softener-containing polyethylene naphthalate film. And the like. Since it is suitable for continuous production, an extrusion method is preferred.

  The kneading method is not particularly limited. Examples of this method include a method using an extruder, a plastograph, a kneader, a Banbury mixer, a calendar roll, or the like. Especially, since it is suitable for continuous production, a method using an extruder is preferable, and a method using a twin screw extruder is more preferable. In addition, when the softener-containing polyethylene naphthalate film according to the present invention has a laminated structure of two or more layers, each layer is prepared separately, and then each layer is laminated to obtain a multilayer softener-containing polyethylene naphthalate film. Alternatively, the layers may be laminated by coextrusion to obtain a softener-containing polyethylene naphthalate film.

(Insulating film with metal foil and manufacturing method of insulating film with metal foil)
In FIG. 5, the insulating film with metal foil which concerns on one Embodiment of this invention is typically shown with a partially notched cross-sectional view.

  The insulating film 1 with metal foil shown in FIG. 5 is preferably used by being laminated on a heat conductor having a thermal conductivity of 10 W / m · K or more. The insulating film 1 with a metal foil is obtained by laminating a metal foil 3 on a softener-containing polyethylene naphthalate film 31 having a polyethylene naphthalate film 2 and a softener. Specifically, using the softening agent-containing polyethylene naphthalate film 31, the first main surface 2 a containing the softening agent of the polyethylene naphthalate film 2 is applied to the first main surface 2 a of the polyethylene naphthalate film 2 by the softening agent. It is obtained by laminating the metal foil 3 by softening the main surface 2a.

  The insulating film 1 with a metal foil includes a polyethylene naphthalate film 2 and a metal foil 3. The polyethylene naphthalate film 2 has an insulating property and is an insulating film. A metal foil 3 is laminated on the first main surface 2 a of the polyethylene naphthalate film 2. The second main surface 2b opposite to the first main surface 2a of the polyethylene naphthalate film 2 is preferably a surface on which a heat conductor having a thermal conductivity of 10 W / m · K or more is laminated. In addition, the metal foil 3 may be laminated | stacked on the whole area | region of the 1st main surface 2a of the polyethylene naphthalate film 2, and may be laminated | stacked on the one part area | region. Moreover, it is preferable that the said metal foil is directly laminated | stacked on the 1st main surface of the said polyethylene naphthalate film.

  Since the insulating film 1 with a metal foil according to the present embodiment is obtained by laminating the metal foil 3 on the first main surface 2a of the polyethylene naphthalate film 2 in the softener-containing polyethylene naphthalate film 31 described above, The peel strength between the polyethylene naphthalate film 2 and the metal foil 3 can be increased.

  Conventionally, in the state of the insulating film with metal foil in which the metal foil is laminated on the first main surface of the polyethylene naphthalate film, the insulating film with metal foil has a thermal conductivity of 10 W / m · K or more. It was not used by being laminated on a certain heat conductor. Conventionally, an insulating film with a metal foil using an insulating film other than a polyethylene naphthalate film is folded in use in the state of a laminate laminated on a heat conductor having a thermal conductivity of 10 W / m · K or more. Have been used. In addition, vibrations may be imparted to the laminate during use, and the laminate may bend.

  Since the insulating film 1 with a metal foil according to the present embodiment has the above-described configuration, since the insulating film is a polyethylene naphthalate film 2 in particular, the insulating film can be bent or vibrated. Chipping and cracking can be made difficult to occur. The insulating film 1 with a metal foil according to the present embodiment has high flexibility and excellent bending characteristics. Therefore, when the insulating film 1 with metal foil is used by being laminated on a heat conductor having a thermal conductivity of 10 W / m · K or more, the insulating film is less likely to be chipped and cracked. It is possible to suppress the appearance failure, peeling, insulation failure, and the like from occurring in the laminated structure using the material.

  In addition, in the insulating film 1 with metal foil, the softening agent may be contained in the polyethylene naphthalate film 2 on the first main surface 2a side. Moreover, in the insulating film 1 with a metal foil, an adhesion improver may be included in the polyethylene naphthalate film 2 on the second main surface 2b side. Further, when a softener-containing polyethylene naphthalate film having an adhesion improver attached to the second main surface of the polyethylene naphthalate film is used, the adhesion improver penetrates into the second main surface. You may do it. An adhesion improver may be attached to the second main surface of the polyethylene naphthalate film, or an adhesion improver may be laminated. Moreover, the adhesiveness improving agent may adhere to the 1st main surface of a polyethylene naphthalate film, and the adhesiveness improving agent may be laminated | stacked.

  In the insulating film with metal foil, the component contained in the softening agent is preferably left in the polyethylene naphthalate film. In this case, as a result of sufficiently softening the vicinity of the surface of the first main surface of the polyethylene naphthalate film, the peel strength between the polyethylene naphthalate film and the metal foil is further increased. In the insulating film with metal foil, the component contained in the adhesion improver preferably remains in the polyethylene naphthalate film.

  Whether or not the component contained in the softening agent or the adhesion improver remains in the polyethylene naphthalate film is confirmed by analysis using time-of-flight secondary ion mass spectrometry TOF-SIMS. It is possible. As a commercial item of the said time-of-flight type secondary ion mass spectrometry TOF-SIMS, "TOF-SIMS type 5" by ION-TOF, etc. are mentioned. In the insulating film with metal foil, the softening agent may be lost by heating or the like. In the insulating film with metal foil, the adhesion improver is preferably not lost.

  Examples of the polyethylene phthalate film include unstretched polyethylene naphthalate film, uniaxially stretched polyethylene naphthalate film, and biaxially stretched polyethylene naphthalate film. Especially, since the intensity | strength of the said polyethylene naphthalate film becomes still higher, the stretched polyethylene naphthalate film is preferable. Moreover, there exists a tendency which can laminate | stack the said metal foil on the 1st main surface of the said polyethylene naphthalate film at a comparatively low temperature, and can affix by use of the stretched polyethylene naphthalate film. For example, it becomes easy to bond the polyethylene naphthalate film and the metal foil at a temperature lower than the melting point of the polyethylene naphthalate film, and the polyethylene naphthalate film and the metal foil are bonded even at a temperature of 260 ° C. or lower. It becomes easy to match.

  The polyethylene naphthalate film is obtained by reacting 2,6-naphthalenedicarboxylic acid and ethylene glycol using 2,6-naphthalenedicarboxylic acid and ethylene glycol as main components. The ratio of the skeleton derived from 2,6-naphthalenedicarboxylic acid and ethylene glycol is preferably 50% by weight or more, more preferably 80% by weight or more, and still more preferably 90% in 100% by weight of the total skeleton of the polyethylene naphthalate film. % By weight or more.

  In obtaining the polyethylene naphthalate film, other copolymerizable components different from 2,6-naphthalenedicarboxylic acid and ethylene glycol may be used. Examples of other copolymerizable components include terephthalic acid, isophthalic acid, phthalic acid, 2-methylterephthalic acid, biphenyldicarboxylic acid, tetralindicarboxylic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, and azelain. Acid, sebacic acid, dodecane dicarboxylic acid, cyclohexane dicarboxylic acid, decalin dicarboxylic acid, norbornane dicarboxylic acid, tricyclodecane dicarboxylic acid, pentacyclododecane dicarboxylic acid, isophorone dicarboxylic acid, 3,9-bis (2-carboxyethyl) 2, 4,8,10-tetraoxaspiro [5.5] undecane, trimellitic acid, trimesic acid, pyromellitic acid, tricarballylic acid and esterified products thereof, and diethylene glycol, trimethylene glycol and tetramethylene glycol Lumpur, and the like. Other copolymerizable components other than these may be used. As the other copolymerizable component, only one type may be used, or two or more types may be used in combination.

  The thickness of the polyethylene naphthalate film is preferably 1 μm or more, more preferably 5 μm or more, still more preferably 10 μm or more, preferably 300 μm or less, more preferably 200 μm or less, and even more preferably 120 μm or less. The insulation property of the said polyethylene naphthalate film becomes it high that thickness is more than the said minimum. When the thickness is not more than the above upper limit, when the insulating film with metal foil is attached to the heat conductor, the heat dissipation becomes even better.

  The polyethylene naphthalate film preferably contains no filler, or the filler content in 100% by volume of the polyethylene naphthalate film is preferably 20% by volume or less. The content of the filler in 100% by volume of the polyethylene naphthalate film is more preferably 10% by volume or less, further preferably 5% by volume or less, and particularly preferably 1% by volume or less. Most preferably, the polyethylene naphthalate film contains no filler.

  The first main surface 2a of the polyethylene naphthalate film 2 before the metal foil 3 is laminated is smooth. FIG. 8 shows an insulating film with metal foil according to another embodiment of the present invention. The insulating film 21 with metal foil shown in FIG. 8 is preferably used by being laminated on a heat conductor having a thermal conductivity of 10 W / m · K or more. The insulating film with metal foil 21 includes a polyethylene naphthalate film 22 and a metal foil 23. A metal foil 23 is laminated on the first main surface 22 a of the polyethylene naphthalate film 22. The second main surface 22b of the polyethylene naphthalate film 22 is preferably a surface on which a thermal conductor having a thermal conductivity of 10 W / m · K or more is laminated. The first main surface 22a of the polyethylene naphthalate film 22 before the metal foil 23 is laminated is roughened. For this reason, the 1st main surface 22a of the polyethylene naphthalate film 22 is a rough surface which has a convex part. In addition, the surface on which the polyethylene naphthalate film 22 of the metal foil 23 before being laminated on the polyethylene naphthalate film 22 is laminated is smooth.

  Thus, the said 1st main surface of the said polyethylene naphthalate film before the said metal foil is laminated | stacked may be roughened, and the rough surface which has a convex part may be sufficient as it. In this case, since the convex part of the polyethylene naphthalate film can be embedded in the metal foil, and the metal foil can be embedded in the concave part between the convex parts of the polyethylene naphthalate film, the anchor effect As a result, the peel strength between the polyethylene naphthalate film and the metal foil becomes higher. As the roughening treatment method, a conventionally known method can be used. Examples of the roughening treatment method include a sandblast treatment method and a treatment method using a roughening agent.

  The arithmetic mean roughness Ra of the first main surface of the polyethylene naphthalate film before the metal foil is laminated is preferably 0.1 μm or more, more preferably 0.2 μm or more, and further preferably 0.5 μm or more, Preferably it is 20 micrometers or less, More preferably, it is 15 micrometers or less, More preferably, it is 10 micrometers or less. When the arithmetic average roughness Ra is not less than the above lower limit and not more than the above upper limit, the peel strength between the polyethylene naphthalate film and the metal foil becomes higher. The arithmetic average roughness Ra is measured in accordance with JIS B0601-1994.

  Examples of commercially available polyethylene naphthalate films include Teonex series manufactured by Teijin DuPont Films.

  Examples of the material of the metal foil include aluminum, copper, gold, and a graphite sheet. From the viewpoint of further improving the thermal conductivity, the metal foil is preferably a gold foil, a copper foil, or an aluminum foil, and more preferably a copper foil or an aluminum foil. From the viewpoint of further improving the thermal conductivity and facilitating the etching process, the metal foil is more preferably a copper foil.

  Although the thickness of the said metal foil is not specifically limited, Preferably it is 1 micrometer or more, More preferably, it is 5 micrometers or more, More preferably, it is 10 micrometers or more, Preferably it is 500 micrometers or less, More preferably, it is 300 micrometers or less. It becomes easy to handle that the thickness of the metal foil is not less than the above lower limit. When the thickness of the metal foil is not more than the above upper limit, it is possible to further reduce the thickness of the laminated structure using the insulating film with metal foil.

  As shown in FIG. 5, the surface of the metal foil 3 on which the polyethylene naphthalate film 2 is laminated before being laminated on the polyethylene naphthalate film 2 is roughened. For this reason, the surface on which the polyethylene naphthalate film 2 of the metal foil 3 is laminated is a rough surface having convex portions. In addition, the 1st main surface 2a of the polyethylene naphthalate film 2 before the metal foil 3 is laminated | stacked is smooth.

  Thus, it is preferable that the surface on which the polyethylene naphthalate film of the metal foil before being laminated on the polyethylene naphthalate film is laminated is roughened, and it is a rough surface having convex portions. preferable. In this case, since the convex portion of the metal foil can be embedded in the first main surface of the polyethylene naphthalate film, the anchor effect increases the peel strength between the polyethylene naphthalate film and the metal foil. Get higher. As the roughening treatment method, a conventionally known method can be used.

  The ten-point average roughness Rz of the surface of the metal foil before being laminated to the polyethylene naphthalate film is preferably 0.5 μm or more, more preferably 1 μm or more, and still more preferably. It is 5 μm or more, preferably 12 μm or less, more preferably 10 μm or less, and further preferably 10 μm or less. When the ten-point average roughness Rz is not less than the above lower limit and not more than the above upper limit, the peel strength between the polyethylene naphthalate film and the metal foil becomes higher. The ten-point average roughness Rz is measured according to JIS B0601-1994.

  The 90 ° peel strength between the polyethylene naphthalate film and the metal foil is preferably 3 N / cm or more, more preferably 5 N / cm or more, still more preferably 8 N / cm or more, and particularly preferably 10 N / cm or more. The higher the peel strength, the better. When the peel strength is equal to or higher than the lower limit, peeling between the polyethylene naphthalate film and the metal foil is difficult to occur. Moreover, it can suppress effectively that the said polyethylene naphthalate film and the said metal foil peel, when it is bent or a vibration is provided.

  The first main surface of the polyethylene naphthalate film before laminating the metal foil contains a softening agent that softens the first main surface of the polyethylene naphthalate film by heating, and then the metal is heated while being heated. By laminating the foil, the peel strength between the polyethylene naphthalate film and the metal foil can be set to the above lower limit or more. Furthermore, as a method of further increasing the peel strength between the polyethylene naphthalate film and the metal foil, the surface of the metal foil before the polyethylene naphthalate film is laminated is roughened. Or a roughening treatment of the first main surface of the polyethylene naphthalate film before being laminated on the metal foil, or a method of forming a plurality of convex portions on the surface. Examples thereof include a method of forming a plurality of convex portions on the main surface and a method of increasing the pressure when the metal foil is pressed and laminated on the first main surface of the polyethylene naphthalate film. Two or more of these methods may be used in combination.

  The 90 ° peel strength is measured in accordance with JIS C6481 (Test condition A) under the conditions of 23 ° C. and humidity of 50%. The 90 ° peel strength can be measured by “TENSILON” manufactured by A & D.

  The insulating film 1 with metal foil can be obtained as follows.

  The manufacturing method of the insulating film 1 with a metal foil includes a softening agent for the polyethylene naphthalate film 2 in the softening agent-containing polyethylene naphthalate film 31 using the softening agent-containing polyethylene naphthalate film 31 described above. It is preferable to provide the process (lamination process) of laminating | stacking the metal foil 3 on the main surface 2a. Alternatively, the metal foil 3 may be laminated on the first main surface 2a containing the softening agent of the polyethylene naphthalate film 2 by softening the first main surface 2a of the polyethylene naphthalate film 2 with the softening agent. preferable.

  In the laminating step, the metal foil 3 is preferably laminated on the first main surface 2 a of the polyethylene naphthalate film 2 at a temperature lower than the melting point of the polyethylene naphthalate film 2. In this case, thermal deterioration of the polyethylene naphthalate film in the laminating step can be suppressed, good bending characteristics of the polyethylene naphthalate film can be maintained, and further, discoloration of the polyethylene naphthalate film can be suppressed. Furthermore, the peel strength between the polyethylene naphthalate film and the metal foil can be further increased.

  The temperature at which the metal foil 3 is laminated is preferably (the melting point of the polyethylene naphthalate film (° C.) − 5) ° C. or less, more preferably (the melting point of the polyethylene naphthalate film (° C.) − 10) ° C. or less.

  In the laminating step, it is more preferable to laminate the metal foil 3 on the first main surface 2a of the polyethylene naphthalate film 2 at a temperature of 260 ° C. or lower. In this case, thermal degradation of the polyethylene naphthalate film in the laminating step can be effectively suppressed, and good bending characteristics of the polyethylene naphthalate film can be sufficiently maintained. Furthermore, the peel strength between the polyethylene naphthalate film and the metal foil can be further increased. In particular, when the polyethylene naphthalate film is a stretched polyethylene naphthalate film, the metal foil is laminated at a temperature of 260 ° C. or lower on the first main surface of the polyethylene naphthalate film in the laminating step. It is preferable. In this case, the crystal structure of polyethylene naphthalate imparted by stretching is well maintained. As a result, the strength of the polyethylene naphthalate film is further increased, and chipping and cracking are less likely to occur.

  The lower limit of the temperature at which the metal foil 3 is laminated is not particularly limited. Generally the temperature which laminates | stacks the metal foil 3 is 200 degreeC or more, and it is preferable that it is 220 degreeC or more.

  In the laminating step, it is preferable to pressurize the surface of the metal foil 3 opposite to the polyethylene naphthalate film 2 side. The pressure of pressurization is, for example, about 0.1 MPa or more and 50 MPa or less. When the pressurization pressure is not less than the above lower limit and not more than the above upper limit, the peel strength between the polyethylene naphthalate film and the metal foil is further increased, and the deformation of the polyethylene naphthalate film can be suppressed.

  In order to increase the peel strength between the polyethylene naphthalate film 2 and the metal foil 3, the manufacturing method of the insulating film 1 with the metal foil includes the first main surface 2a of the polyethylene naphthalate film 2 before the metal foil 3 is laminated. It is preferable to further include a step of adding a softening agent that softens the first main surface 2a of the polyethylene naphthalate film 2. In this case, the peel strength between the polyethylene naphthalate film 2 and the metal foil 3 is obtained by laminating the metal foil 3 while heating the first main surface 2a containing the softening agent of the polyethylene naphthalate film 2. However, it is preferable to obtain the insulating film 1 with metal foil which is 3 N / cm or more.

  The manufacturing method of the insulating film 1 with metal foil is the adhesion which improves the adhesiveness of the polyethylene naphthalate film 2 to the heat conductor on the second main surface 2b of the polyethylene naphthalate film 2 before the heat conductor is laminated. It is preferable to further comprise a step of including or attaching a property improver. When a heat conductor is laminated on the second main surface 2b containing or adhering the adhesion improver of the polyethylene naphthalate film 2 by containing or adhering such an adhesion improver, polyethylene naphthalate is obtained. The adhesion between the film 2 and the heat conductor is increased. The step of including or adhering the adhesion improver may be performed simultaneously with the step of including the softener or may be performed separately. The step of including the softening agent may be performed before the metal foil 3 is laminated on the polyethylene naphthalate film 2 or may be performed after the lamination.

(Laminated structure)
It is preferable that the insulating film 1 with a metal foil according to an embodiment of the present invention shown in FIG. FIG. 6 is a sectional view showing an example of a laminated structure using the insulating film 1 with a metal foil shown in FIG.

  A laminated structure 11 shown in FIG. 6 includes an insulating film 1 with a metal foil, a heat conductor 12, and an optical semiconductor device 13.

  The thermal conductivity of the thermal conductor 12 is 10 W / m · K or more. The heat conductor 12 is laminated on the second main surface 2b opposite to the first main surface 2a on which the metal foil 3 of the polyethylene naphthalate film 2 in the insulating film 1 with metal foil is laminated. An optical semiconductor device 13 is laminated on the surface of the metal foil 3 opposite to the polyethylene naphthalate film 2 side. In addition, in FIG. 7, illustration of the convex part of the surface of the metal foil 3 is abbreviate | omitted.

  In the laminated structure 11, the amount of heat generated in the optical semiconductor device 13 is easily transmitted to the heat conductor 12 via the metal foil 3 and the polyethylene naphthalate film 2. In the laminated structure 11, heat can be efficiently dissipated by the heat conductor 12.

  The heat conductor whose heat conductivity is 10 W / m · K or more is not particularly limited. Examples of the heat conductor having a thermal conductivity of 10 W / m · K or more include aluminum, copper, alumina, beryllia, silicon carbide, silicon nitride, aluminum nitride, and graphite sheet. Especially, it is preferable that the heat conductor whose said heat conductivity is 10 W / m * K or more is a metal, and it is more preferable that it is copper or aluminum. Copper or aluminum is excellent in heat dissipation.

  FIG. 7 is a partially cutaway cross-sectional view showing another example of a laminated structure using the insulating film 1 with metal foil shown in FIG. A laminated structure 11 </ b> A shown in FIG. 7 includes an insulating film 1 with a metal foil and a heat conductor 12. The thermal conductivity of the thermal conductor 12 is 10 W / m · K or more. The heat conductor 12 is laminated on the second main surface 2b opposite to the first main surface 2a on which the metal foil 3 of the polyethylene naphthalate film 2 in the insulating film 1 with metal foil is laminated.

  Thus, the laminated structure according to the present invention includes a laminated structure in which the metal foil, the polyethylene naphthalate film, and the heat conductor are laminated, and the optical semiconductor device is not mounted.

  Moreover, when obtaining the said laminated structure, you may integrate the said metal foil, the said softener containing polyethylene naphthalate film, and the said heat conductor 3 layers simultaneously. Further, after the two of these three layers are integrated in advance, the remaining one layer may be further integrated. That is, you may obtain a laminated structure, without obtaining the insulating film with metal foil beforehand. Specifically, a metal foil is laminated on the first main surface of the polyethylene naphthalate film using the above-described softener-containing polyethylene naphthalate film, and the second main surface of the polyethylene naphthalate film. (1) A metal foil is arranged on the first main surface side of the polyethylene naphthalate film, and the second structure of the polyethylene naphthalate film is obtained. A heat conductor having a thermal conductivity of 10 W / m · K or more is disposed on the main surface side of the metal foil, and the metal foil, the polyethylene naphthalate film, and the heat conductor are integrated, or (2) After arranging a metal foil on the first main surface side of the polyethylene naphthalate film and integrating the metal foil and the polyethylene naphthalate film A thermal conductor having a thermal conductivity of 10 W / m · K or more is disposed on the second main surface side of the polyethylene naphthalate film, and the metal foil, the polyethylene naphthalate film, and the thermal conductor are disposed. Or (3) a thermal conductor having a thermal conductivity of 10 W / m · K or more is disposed on the second main surface side of the polyethylene naphthalate film, and the polyethylene naphthalate film After integrating the heat conductor, a metal foil is disposed on the first main surface side of the polyethylene naphthalate film, and the metal foil, the polyethylene naphthalate film, and the heat conductor are integrated. The laminated structure may be obtained by making it.

  By disposing the polyethylene naphthalate film so as to be in contact with the metal foil on the first main surface side and in contact with the heat conductor on the second main surface side, between the metal foil and the heat conductor, Heat dissipation of the laminated structure in which the metal foil, the polyethylene naphthalate film, and the heat conductor are integrated as a result of the absence of a thick layer other than the polyethylene naphthalate film and the proximity of the metal foil and the heat conductor. Performance can be increased.

  Hereinafter, the present invention will be clarified by giving specific examples and comparative examples of the present invention. The present invention is not limited to the following examples.

  In the examples and comparative examples, the following materials were used.

Thermosetting compound:
(1) Bisphenol A type epoxy resin 1 (“YD127” manufactured by Nippon Steel Chemical Co., Ltd., liquid at 23 ° C.)
(2) Bisphenol A type epoxy resin 2 (“828U” manufactured by Mitsubishi Chemical Corporation, liquid at 23 ° C.)
(3) Solid bisphenol A type epoxy resin (“YD011” manufactured by Mitsubishi Chemical Corporation, dimer, solid at 23 ° C.)
(4) Triazine type epoxy resin (“TEPIC SP” manufactured by Nippon Steel Chemical Co., Ltd., solid at 23 ° C.)
(5) Biphenyl type epoxy resin (“YX4000H” manufactured by Mitsubishi Chemical Corporation, solid at 23 ° C.)
(6) Dicyclopentadiene type epoxy resin 1 (“HP7200L” manufactured by DIC, solid at 23 ° C.)
(7) Dicyclopentadiene type epoxy resin 2 (“EXA7200HH” manufactured by DIC, solid at 23 ° C.)
(8) Naphthalene skeleton-containing highly heat-resistant epoxy resin (“EPICLON HP4710” manufactured by DIC, solid at 23 ° C.)
(9) Alicyclic epoxy resin (“Celoxide 2021P” manufactured by Daicel Chemical Industries, Ltd., liquid at 23 ° C.)
(10) Bismaleimide resin (“BMI-2300” manufactured by Daiwa Kasei Co., Ltd., solid at 23 ° C.)
(11) Benzoxazine resin (“pd-type” manufactured by Shikoku Kasei Co., Ltd., solid at 23 ° C.)
(12) Oxetane resin (“OXBP” manufactured by Ube Industries, Ltd., liquid at 23 ° C.)
(13) Modified epoxy acrylate ("EBECRYL3700" manufactured by Daicel Cytec, solid at 23 ° C)
(14) Cresol novolac type epoxy resin (“YDCN-704” manufactured by Nippon Steel Chemical Co., Ltd., solid at 23 ° C.)

Curing agent:
(1) Acid anhydride curing agent 1 (“YH307” manufactured by Mitsubishi Chemical Corporation, liquid at 23 ° C.)
(2) Acid anhydride curing agent 2 (“YH306” manufactured by Mitsubishi Chemical Corporation, liquid at 23 ° C.)
(3) Acid anhydride curing agent 3 (“YH309” manufactured by Mitsubishi Chemical Corporation, solid at 23 ° C.)
(4) Acid anhydride curing agent 4 (“Licacid TMTA C” manufactured by Mitsubishi Chemical Corporation, solid at 23 ° C.)
(5) Acid anhydride curing agent 5 (“Licacid TMEG 200” manufactured by Mitsubishi Chemical Corporation, solid at 23 ° C.)
(6) Acid anhydride curing agent 6 (“Licacid TMEG 500” manufactured by Mitsubishi Chemical Corporation, solid at 23 ° C.)
(7) Acid anhydride curing agent 7 (“B4400” manufactured by DIC, solid at 23 ° C.)
(8) Phenol curing agent 1 (Phenol novolak curing agent, “Resitop PSM4326” manufactured by Gunei Chemical Co., Ltd., solid at 23 ° C.)
(9) Phenol curing agent 2 (“MEH7600” manufactured by Meiwa Kasei Co., Ltd., solid at 23 ° C.)
(10) Phenol curing agent 3 (Maywa Kasei's “MEH8005”, liquid at 23 ° C.)
(11) Phenol curing agent 4 (“MEH8000H” manufactured by Meiwa Kasei Co., Ltd., liquid at 23 ° C.)
(12) Phenol curing agent 5 (“5292B” manufactured by Huntsman, liquid at 23 ° C. (viscous liquid))
(13) Phenol curing agent 6 (“MEH7500” manufactured by Meiwa Kasei Co., Ltd., solid at 23 ° C.)

(Organic metal compound)
(1) Organic aluminate compound (acetoalkoxyaluminum diisopropylate, “Plenact AL-M” manufactured by Ajinomoto Fine Techno Co., Ltd.)
(2) Organic titanate compound ("Plenact KR55" manufactured by Ajinomoto Fine Techno Co., Ltd.)
(3) Organic zirconate compound ("Orgatics ZA-45" manufactured by Matsumono Fine Chemical Co., Ltd.)
(4) Organosilane compound (vinyltrimethoxysilane, “KBM-1003” manufactured by Shin-Etsu Chemical Co., Ltd.)

Other ingredients:
(1) Cresol novolac resin (DIC Corporation "KA-1160")

Example 1
7.4 parts by weight of dicyclopentadiene type epoxy resin 1 (“HP7200L” manufactured by DIC, solid at 23 ° C.) and phenol curing agent 1 (phenol novolac curing agent, “Resitop PSM 4326” manufactured by Gunei Chemical Co., Ltd. 4 parts by weight, phenol curing agent 2 (“MEH7600” manufactured by Meiwa Kasei Co., Ltd., solid at 23 ° C.) 0.3 parts by weight, and organic aluminate compound (acetoalkoxy aluminum diisopropylate, manufactured by Ajinomoto Fine Techno Co., Ltd. "Plenact AL-M") 0.3 parts by weight was blended to obtain a mixture. The mixture includes a softener and an adhesion improver.

  Also, polyethylene naphthalate resin pellets were prepared. 100 parts by weight of the pellets were melted, and 10 parts by weight of the resulting mixture was mixed with the melted pellets, melt-extruded, and then biaxially stretched. In this way, a single-layer polyethylene naphthalate film (insulating film, thickness 25 μm) was obtained. The obtained polyethylene naphthalate film contained a softener and an adhesion improver as a whole.

  Next, an insulating film with a copper foil is obtained by laminating and pasting the copper foil on the first main surface of the insulating film from the roughened surface side at a temperature of 240 ° C. and a pressure of 8 MPa. It was. In the obtained insulating film with copper foil, a plurality of convex portions of the copper foil were embedded in the polyethylene naphthalate film.

(Examples 2 to 62)
The thickness of the single-layer insulating film, the type and amount of compounding components used in the mixture, and the process conditions when laminating and pasting the copper foil on the first main surface of the insulating film from the roughened surface side Except having set as shown in the following Tables 1-5, it carried out similarly to Example 1, and obtained the insulating film with copper foil. In all the insulating films with copper foil obtained in Examples 2 to 62, the plurality of convex portions of the copper foil were embedded in the polyethylene naphthalate film.

(Comparative Example 1)
5 parts by weight of bisphenol A liquid epoxy resin 2 (“828U” manufactured by Mitsubishi Chemical Corporation), 2 parts by weight of hexahydrophthalic acid skeleton liquid epoxy resin (“AK-601” manufactured by Nippon Kayaku Co., Ltd.), and epoxy group-containing acrylic 5 parts by weight of a resin (Mafuru “G-1030S” manufactured by NOF Corporation), 4 parts by weight of an alicyclic skeleton acid water (“MH-700” manufactured by Shin Nippon Rika Co., Ltd.), and isocyanuric modified solid dispersion type imidazole ( 1 part by weight of "2MZA-PW" manufactured by Shikoku Kasei Co., Ltd., 1 part by weight of surface hydrophobized fumed silica ("MT-10" manufactured by Tokuyama Corporation), and 80 parts by weight of spherical alumina ("DAM-10" manufactured by Denka) An insulating material was obtained by mixing and kneading the part.

  The obtained insulating material was applied onto a release PET (polyethylene terephthalate) film and dried at 90 ° C. for 30 minutes to obtain an insulating film (thickness: 38 μm).

  After laminating the copper foil used in Example 1 on the first main surface of the obtained insulating film, the insulating film was cured at 120 ° C. for 1 hour and further at 200 ° C. for 1 hour to obtain an insulating film with copper foil. Got. When using this insulating film with copper foil, the release PET film was peeled off.

(Reference Example 1)
A polyethylene naphthalate film (biaxially stretched polyethylene naphthalate film, thickness 38 μm, melting point 272 ° C., Teonex manufactured by Teijin DuPont Films Ltd.) was prepared as an insulating film. In this insulating film, the softener is not included in the insulating film on the first main surface side, and the adhesion improving agent is not included in the insulating film on the second main surface side. Moreover, the copper foil used in Example 1 was prepared.

  Next, an insulating film with a copper foil is obtained by laminating and pasting the copper foil on the first main surface of the insulating film at a temperature of 240 ° C. and a pressure of 30 MPa from the roughened surface side. It was. In the obtained insulating film with copper foil, a plurality of convex portions of the copper foil were embedded in the polyethylene naphthalate film.

(Example 63)
In order to form the first and second layers, the polyethylene naphthalate resin pellets used in Example 1 and the mixture obtained in Example 1 were mixed at the same ratio as in Example 1 and further used. In order to form the third layer, using only the polyethylene naphthalate resin pellets used in Example 1, the first to third layers were laminated by melt coextrusion and then solidified, and then biaxially stretched did. Thus, a polyethylene naphthalate film having a three-layer structure (insulating film, thickness 25 μm, thickness of the first layer on the first main surface side 5 μm, second layer on the second main surface side) The thickness was 5 μm, and the thickness of the third layer between the first layer and the second layer was 15 μm. In the obtained polyethylene naphthalate film, each of the first and second layers contained a softener and an adhesion improver. The third layer did not contain both the softener and the adhesion improver.

  Next, an insulating film with a copper foil is obtained by laminating and pasting the copper foil on the first main surface of the insulating film from the roughened surface side at a temperature of 240 ° C. and a pressure of 8 MPa. It was. In the obtained insulating film with copper foil, a plurality of convex portions of the copper foil were embedded in the polyethylene naphthalate film.

(Example 64)
Insulating film with copper foil in the same manner as in Example 63 except that the types and amounts of the compounding components used in the mixture used for forming the first and second layers were set as shown in Table 5 below. Got. In the obtained insulating film with copper foil, a plurality of convex portions of the copper foil were embedded in the polyethylene naphthalate film.

(Evaluation)
(1) Bending characteristics 1
The obtained insulating film with copper foil was cut into a size of 1 cm in width and 10 cm in length. An aluminum plate (width 1 cm, length 10 cm, thickness 0.5 mm) as a support was laminated on the surface of the insulation film with copper foil opposite to the insulation film side of the copper foil to obtain a laminate. In this state, the laminate was folded in a U-shape so that the insulating film was on the outside and the aluminum plate was on the inside, so that the distance between the ends was 4 mm in the 180 ° direction at the center. It was evaluated whether or not the insulating film after bending was cracked or chipped.

[Criteria for bending property 1]
○○: No cracks or chipping occurred in the folded insulating film ○: No cracks occurred in the folded insulating film, but small cracks occurred ×: The entire surface of the folded insulating film across the width direction There are cracks or large chips that can be visually observed

(2) Bending characteristics 2
The aluminum plate (thickness 0.5 mm) was laminated | stacked on the 2nd main surface opposite to the 1st main surface where the metal foil in the obtained insulating film with copper foil was laminated | stacked. Next, after removing the copper foil by etching, the insulating film with an aluminum plate was cut into a size of 1 cm in width and 10 cm in length. In this state, the laminate was folded in a U-shape so that the insulating film was on the outside and the aluminum plate was on the inside, so that the distance between the ends was 4 mm in the 180 ° direction at the center. It was evaluated whether or not the insulating film after bending was cracked or chipped.

[Criteria for bending property 2]
○○: No cracks or chipping occurred in the folded insulating film ○: No cracks occurred in the folded insulating film, but small cracks occurred ×: The entire surface of the folded insulating film across the width direction There are cracks or large chips that can be visually observed

(3) 90 ° peeling strength (peeling strength)
Using “TENSILON” manufactured by A & D, the 90 ° peel strength between the insulating film and the copper foil was measured in accordance with JIS C6481 (Test condition A) under conditions of 23 ° C. and 50% humidity. .

(4) Surface stickiness A release film was affixed to the surfaces on both sides of the softener-containing polyethylene naphthalate film. Then, the stickiness of the surface was determined according to the following criteria from the state when the release films on both sides were peeled off.

[Criteria for surface stickiness]
○○: There was no stickiness on the surfaces on both sides, and the release film could be peeled off well. ○: Although the surfaces on both sides were somewhat sticky, the release film could be peeled. ×: The release films were sticky on both sides. The peeling failure occurred

(5) Adhesiveness An aluminum plate (thickness 0.5 mm) is laminated on the second main surface opposite to the first main surface on which the metal foil in the obtained insulating film with copper foil is laminated, and a laminated structure Got.

  The copper foil and polyethylene naphthalate film of the obtained laminated structure were cut using a cutter to form a rectangular copper foil pattern (length 10 cm × width 1 cm). Adhesion of polyethylene naphthalate film to aluminum plate by observing the presence or absence of float and peeling of aluminum plate laminated on the opposite side of copper foil of polyethylene naphthalate film when copper foil is peeled off from the end Evaluated. Adhesion was determined according to the following criteria.

[Adhesion criteria]
○○: No floating or peeling on the aluminum plate at a position corresponding to the widthwise end and center of the peeled copper foil ○: Aluminum at a position corresponding to the widthwise end of the peeled copper foil In the position corresponding to the central part in the width direction of the peeled copper foil where the maximum length is less than 1 mm on the plate, no peeling on the aluminum plate. Δ: Corresponding to the widthwise end of the peeled copper foil At the position where the aluminum plate floats up to a maximum length of 1 mm and corresponds to the central portion of the peeled copper foil in the width direction, and no peeling on the aluminum plate ×: width direction of the peeled copper foil There is peeling on the aluminum plate at a position corresponding to the center of

  The results are shown in Tables 1 to 5 below. In Tables 4 and 5 below, “-” indicates that evaluation is not performed. In Table 4, “* 1” indicates “120 ° C. for 1 hour, further 200 ° C. for 1 hour”.

  In addition, as a result of the analysis using time-of-flight secondary ion mass spectrometry TOF-SIMS (“TOF-SIMS type 5” manufactured by ION-TOF), each of the insulating films with copper foil obtained in Examples 1 to 64 On the first main surface side of the polyethylene naphthalate film, the components contained in the softening agent remained in the polyethylene naphthalate film. Furthermore, in the insulating film with copper foil obtained in Examples 1 to 45, 63, and 64, on the second main surface side of the polyethylene naphthalate film, the component contained in the adhesion improver was polyethylene. It remained in the naphthalate film. Moreover, by the cross-sectional observation, it confirmed that the said metal foil was laminated | stacked directly on the said 1st main surface of the said polyethylene naphthalate film in the insulating film with copper foil of Examples 1-64.

DESCRIPTION OF SYMBOLS 1 ... Insulating film with metal foil 2 ... Polyethylene naphthalate film 2a ... 1st main surface 2b ... 2nd main surface 3 ... Metal foil 11 ... Laminated structure 11A ... Laminated structure 12 ... Thermal conductor 13 ... Optical semiconductor Apparatus 21 ... Insulating film with metal foil 22 ... Polyethylene naphthalate film 22a ... First main surface 22b ... Second main surface 23 ... Metal foil 31 ... Softener-containing polyethylene naphthalate film 41, 51, 61 ... Softener-containing Polyethylene naphthalate film 42, 52, 62 ... Polyethylene naphthalate film 42A ... First layer 42B ... Second layer 42C ... Third layer 52A ... First layer 52B ... Second layer 42a, 52a, 62a ... 1st main surface 42b, 52b, 62b ... 2nd main surface 63 ... Adhesion improvement agent

Claims (14)

A softener-containing polyethylene naphthalate film used by being laminated on a metal foil,
A polyethylene naphthalate film which is an insulating film;
A softener-containing polyethylene naphthalate film having a softener contained in the polyethylene naphthalate film on the first main surface side of the polyethylene naphthalate film.   The softener-containing polyethylene naphthalate film according to claim 1, wherein the softener includes a thermosetting composition or a compound that dissolves the polyethylene naphthalate film by heating.   The softener-containing polyethylene naphthalate film according to claim 1 or 2, wherein the polyethylene naphthalate film is a single layer. The polyethylene naphthalate film has a laminated structure of at least two layers,
The softener-containing polyethylene naphthalate film according to claim 1 or 2, wherein the softener is contained in a layer arranged on the first main surface side of the polyethylene naphthalate film. A second main surface side opposite to the first main surface side of the polyethylene naphthalate film, is contained in the polyethylene naphthalate film or attached to the second main surface; and Having an adhesion improver that improves the adhesion of the polyethylene naphthalate film to the thermal conductor;
The polyethylene naphthalate film has a laminated structure of at least two layers,
The softener-containing polyethylene naphthalate film according to claim 1, 2, or 4, wherein the adhesion improver is contained in a layer disposed on the second main surface side of the polyethylene naphthalate film. . A second main surface side opposite to the first main surface side of the polyethylene naphthalate film, is contained in the polyethylene naphthalate film or attached to the second main surface; and Having an adhesion improver that improves the adhesion of the polyethylene naphthalate film to the thermal conductor;
The polyethylene naphthalate film has a laminated structure of at least three layers;
In the layer disposed on the first main surface side of the polyethylene naphthalate film, the softening agent is contained,
The softener-containing polyethylene naphthalate film according to claim 1 or 2, wherein the adhesion improver is contained in a layer disposed on the second main surface side of the polyethylene naphthalate film.   A second main surface side opposite to the first main surface side of the polyethylene naphthalate film, is contained in the polyethylene naphthalate film or attached to the second main surface; and The softener-containing polyethylene naphthalate film according to any one of claims 1 to 4, comprising an adhesion improver that improves the adhesion of the polyethylene naphthalate film to the thermal conductor. A second main surface side opposite to the first main surface side of the polyethylene naphthalate film is contained in or adhered to the second main surface of the polyethylene naphthalate film; and Having an adhesion improver that improves the adhesion of the polyethylene naphthalate film to the thermal conductor;
The softener-containing polyethylene naphthalate film according to any one of claims 1 to 6, wherein the adhesion improver comprises an organic aluminate compound, an organic titanate compound, an organic zirconate compound, or an organic silane compound. It is obtained by heating the softener-containing polyethylene naphthalate film according to any one of claims 1 to 8,
A softened polyethylene naphthalate film in which the first main surface of the polyethylene naphthalate film is softened by the softening agent. The softener-containing polyethylene naphthalate film according to any one of claims 1 to 8, wherein the polyethylene naphthalate film contains the softener in the first main surface, and the softener contains the polyethylene naphthalate film. Obtained by softening the first main surface of the phthalate film and laminating a metal foil,
The polyethylene naphthalate film which is an insulating film;
An insulating film with a metal foil, comprising: a metal foil laminated on the first main surface of the polyethylene naphthalate film.   The softener-containing polyethylene naphthalate film according to any one of claims 1 to 8, wherein the softener is contained in the first main surface containing the softener of the polyethylene naphthalate film. The manufacturing method of the insulating film with metal foil provided with the process of softening the said 1st main surface of the said polyethylene naphthalate film, and laminating | stacking metal foil. A metal foil is laminated on the first main surface of the polyethylene naphthalate film using the softener-containing polyethylene naphthalate film according to any one of claims 1 to 8, and the polyethylene naphthalate film A method for producing a laminated structure for obtaining a laminated structure in which the thermal conductor is laminated on the second main surface of
A metal foil is disposed on the first main surface side of the polyethylene naphthalate film, and a heat conductor having a thermal conductivity of 10 W / m · K or more is disposed on the second main surface side of the polyethylene naphthalate film. Arrange and integrate the metal foil, the polyethylene naphthalate film and the thermal conductor,
After disposing a metal foil on the first main surface side of the polyethylene naphthalate film and integrating the metal foil and the polyethylene naphthalate film, the second main surface of the polyethylene naphthalate film A thermal conductor having a thermal conductivity of 10 W / m · K or more on the side, and integrating the metal foil, the polyethylene naphthalate film, and the thermal conductor, or
A thermal conductor having a thermal conductivity of 10 W / m · K or more is disposed on the second main surface side of the polyethylene naphthalate film, and the polyethylene naphthalate film and the thermal conductor are integrated. Then, the manufacturing method of a laminated structure which arrange | positions metal foil in the said 1st main surface side of the said polyethylene naphthalate film, and integrates the said metal foil, the said polyethylene naphthalate film, and the said heat conductor. Insulating film with metal foil according to claim 10,
Heat conduction that is laminated on the second main surface opposite to the first main surface on which the metal foil is laminated in the insulating film with metal foil and has a thermal conductivity of 10 W / m · K or more. A laminated structure comprising the body. An insulating film with a metal foil obtained by the method for producing an insulating film with a metal foil according to claim 11,
Heat conduction that is laminated on the second main surface opposite to the first main surface on which the metal foil is laminated in the insulating film with metal foil and has a thermal conductivity of 10 W / m · K or more. A laminated structure comprising the body.

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