JP2016037022A - Laminate and method for producing laminate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a laminate having high interlayer adhesive strength which comprises a PTFE layer and a heat-resistant resin layer (substrate), and to produce such a laminate with high productivity.SOLUTION: There is provided a laminate which comprises a PTFE layer (A), a layer (B) containing a fluorine resin (b) which can be fused to an adjacent layer by irradiation of light containing visible light, and a heat-resistant resin layer (C) (provided that the layers (A) and (C) are individually different from the layer (B)) in this order.SELECTED DRAWING: None

Description

  The present invention relates to a laminate and a method for producing the laminate.

  Polytetrafluoroethylene (PTFE) has a low coefficient of friction and is excellent in properties such as heat resistance, chemical resistance, weather resistance, moisture absorption / water absorption, and electrical insulation. In (base material), it is used for the processing of the surface.

  At the time of this surface processing, for example, the PTFE film and the base material (attachment surface) are adhered to each other by hot pressing the PTFE film via a thermosetting adhesive or the like. A film was formed.

  However, the PTFE film has poor adhesion to the base material due to its non-stickiness, and even when the surface processing is performed by the above method, a surface processed article having sufficient adhesive strength with the base material can be obtained. There wasn't.

  The present invention has been made in view of such problems, and is a laminate including a PTFE layer and a heat-resistant resin layer (base material), and provides a laminate having high interlayer adhesion strength. Moreover, it aims at manufacturing such a laminated body with sufficient productivity.

Under such circumstances, the present inventors have intensively studied to solve the above problems, and as a result, according to a laminate in which a PTFE layer and a heat-resistant resin layer are laminated via a specific layer, the object is achieved. The present invention has been completed.
A configuration example of the present invention is as follows.

  [1] A polytetrafluoroethylene (PTFE) layer (A), a layer (B) containing a fluororesin (b) that can be fused to an adjacent layer by irradiation with light including visible light, and a heat resistant resin layer (C ) (However, layers (A) and (C) are different from layer (B), respectively) in this order.

[2] The laminate according to [1] obtained by a method including the following step 1.
Step 1: Laminate the layer to be the PTFE layer and the heat resistant resin layer via the layer containing the fluororesin (b), and the layer side to be the PTFE layer on the layer containing the fluororesin (b) or The process of obtaining the laminated body which the said PTFE layer and the heat resistant resin layer fuse | melted through the layer containing a fluororesin (b) by irradiating the light containing visible light from the layer side used as the heat resistant resin layer

  [3] The laminate according to [1] or [2], wherein the fluororesin (b) is a tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA).

  [4] The laminate according to any one of [1] to [3], wherein the layer (B) contains a visible light absorber.

  [5] The step 1 is a step of irradiating light on a side opposite to a layer irradiated with light including visible light using a layer that helps melt the fluororesin (b). The laminate according to any one of [2] to [4].

  [6] The laminate according to any one of [1] to [5], wherein the heat resistant resin layer (C) includes a heat resistant resin, and the melting point of the resin is equal to or higher than the melting point of the fluororesin (b). .

  [7] The laminate according to any one of [2] to [6], wherein the step 1 is a step of irradiating light including visible light using a high-intensity discharge lamp or a halogen lamp.

  [8] The PTFE layer and the layer that becomes the heat resistant resin layer are laminated via the layer containing the fluororesin (b), and the layer that becomes the PTFE layer or the heat resistant layer is laminated on the layer containing the fluororesin (b). Step 1 for obtaining a laminate in which the PTFE layer and the heat-resistant resin layer are fused via a layer containing a fluororesin (b) by irradiating light containing visible light from the layer side that becomes the heat-sensitive resin layer The manufacturing method of the laminated body in any one of [1]-[7] containing.

  [9] The step 1 is a step of irradiating light on a side opposite to a layer irradiated with light including visible light using a layer that helps melt the fluororesin (b). The manufacturing method of the laminated body as described in [8].

  ADVANTAGE OF THE INVENTION According to this invention, the laminated body which has a PTFE layer and a heat resistant resin layer and has high interlayer adhesive strength can be manufactured with sufficient productivity.

FIG. 1 is a schematic diagram showing an example of a cross section of the laminate of the present invention. FIG. 2 is a schematic diagram illustrating an example of a lining sheet. FIG. 3 is a schematic diagram showing an example of an enlarged cross section of the broken line portion of FIG. FIG. 4 is a schematic diagram illustrating an example of a cross section of a welded portion when a sheet is welded by a conventional welding method. FIG. 5 is a schematic cross-sectional view showing an example when the laminate of the present invention is manufactured.

≪Laminated body≫
The laminate according to the present invention is represented by, for example, FIG. 1, and includes a PTFE layer (A) 12, a layer (B) 14 including a fluororesin (b) that can be fused to an adjacent layer by irradiation with light including visible light, And the heat resistant resin layer (C) 16 is included in this order. Such a laminate of the present invention has high adhesive strength between the PTFE layer (A) and the heat resistant resin layer (C).

The laminate of the present invention is not particularly limited as long as the layers (A), (B) and (C) are included in this order, and between the layers (A) and (B) or between the layers (B) and Although a conventionally well-known layer may be contained between (C), from the point that the laminated body which has the said effect can be obtained easily, between layers (A) and (B), It is preferable that no other layer is contained between the layers (B) and (C).
In the present invention, adjacent layers contain at least different resins. Therefore, the layers (A) and (B) and the layers (B) and (C) are different layers, but the layers (A) and (C) may be the same layer or different layers. Good.

Further, the surface 12a opposite to the layer (B) side of the layer (A) and the surface 16a opposite to the layer (B) side of the layer (C) are conventionally known depending on the desired application. The layer (not shown) may be present, but has a low coefficient of friction and excellent properties such as heat resistance, chemical resistance, weather resistance, moisture absorption / water absorption, and electrical insulation ( In consideration of obtaining the laminate 10 capable of sufficiently exhibiting the characteristics of A), it is preferable that no other layer exists on the surface 12a opposite to the layer (B) side of the layer (A). .
The surface 16a of the layer (C) opposite to the layer (B) side has a desired use, specifically, a layer constituting an article whose surface is to be processed (protected) with the layer (A) ( (Not shown) may exist.

The shape of the laminate 10 of the present invention is not particularly limited, and may be appropriately selected according to a desired application.
Although the use of the laminated body 10 of this invention is not restrict | limited in particular, For example, a diaphragm valve and a lining sheet are mentioned.

≪Laminated body manufacturing method≫
The production method of the laminate of the present invention is not particularly limited as long as each layer is formed so as to obtain a laminate 10 in which the layers (A), (B), and (C) are included in this order. The layer that becomes the PTFE layer and the layer that becomes the heat-resistant resin layer may be manufactured by hot pressing through a layer containing the fluororesin (b).

However, the hot press is not suitable for processing the surface of an article having a large area (eg, 1 m ² or more), and uses a thick PTFE layer (film) (eg, a film thickness of 3 mm or more). In such a case, the loss increases when the heat is transferred to the bonding interface, so that it is difficult to obtain a laminate with high productivity.

  On the other hand, by producing a laminate by a method including the following step 1, a laminate having sufficient adhesive strength between layers constituting the laminate can be produced with high productivity, and a laminate having a large area. A laminated body having a PTFE layer with a smooth body and surface can be easily obtained. For this reason, it is preferable to obtain the laminated body of this invention by the method containing the following processes 1.

In step 1, the PTFE layer and the heat-resistant resin layer are laminated via a layer containing a fluororesin (b) that can be fused to an adjacent layer by irradiation with light including visible light. a layered product in which the PTFE layer and the heat-resistant resin layer are fused by irradiating the layer containing b) with light containing visible light from the layer side to be the PTFE layer or the layer side to be the heat-resistant resin layer It is the process of obtaining.
The “layer to be a PTFE layer” used in this step refers to a layer to be the layer (A) in the obtained laminate, and refers to a PTFE film, for example. In some cases, the layer (A) constituting the laminate of the invention is not particularly distinguished from the layer used when the laminate is produced. The same applies to the “layer to be a heat-resistant resin layer” and the “layer containing the fluororesin (b)”.

<PTFE layer>
The PTFE layer (hereinafter also simply referred to as “layer (A)”) is not particularly limited as long as it is a layer containing PTFE.
The layer (A) may contain a conventionally known additive that may be added to the resin layer, which is conventionally known, within a range that does not impair the effects of the present invention. Since it has physical properties, a layer having sufficient physical properties can be obtained without including an additive. For example, when the layer (A) is used in an application in contact with a liquid, the layer contains an additive. Depending on the use of the laminate, the layer (A) is a layer not containing an additive because the additive becomes an impurity and may contaminate the liquid in contact with the layer (A). It is preferable.

  The layer (A) is preferably formed using a PTFE film previously formed by a conventionally known method. From the viewpoint of obtaining a layer (A) having a smooth surface, a molding powder is used. A PTFE film obtained by compression molding or ram extrusion molding, or a PTFE film obtained by paste extrusion molding using fine powder is more preferred.

  The thickness of the layer (A) may be appropriately selected according to the desired application, and is not particularly limited. However, the characteristics of PTFE are fully utilized, and the liquid impermeability, strength, corrosion resistance, etc. are excellent. From the standpoint of obtaining a laminate, it is preferably 0.1 to 7 mm, more preferably 1 to 5 mm.

<Heat resistant resin layer>
The heat-resistant resin layer (hereinafter also simply referred to as “layer (C)”) is not particularly limited as long as it is a layer containing a heat-resistant resin, and a layer containing a conventionally known heat-resistant resin can be used. Further, it may be an article (base material, layer) containing a heat-resistant resin whose surface is desired to be processed with a PTFE layer.

  The melting point (softening point in the crystalline polymer) measured by differential scanning calorimetry (DSC) of the heat-resistant resin is deformed or modified in the layer (C) by light that can be irradiated when the laminate of the present invention is produced. The melting point of the fluororesin (b) is more than the melting point of the fluororesin (b), more preferably the melting point of the fluororesin (b) plus 100 ° C. or less. More preferably, the melting point of the fluororesin (b) is plus 1 to 50 ° C., particularly preferably plus 5 to 20 ° C.

Examples of such heat resistant resins include fluororesins, polyimides, polyamideimides, polybenzimidazoles, polybenzoxazoles, polyphenylene sulfides, polyether ether ketones, polyether sulfones, and polyether imides.
Among these, it is excellent in characteristics such as heat resistance, chemical resistance, weather resistance, moisture absorption / water absorption, and electrical insulation, particularly when the layer (A) is used in contact with a liquid. When the liquid has a property of deteriorating the resin, the liquid may permeate the layer (A). Therefore, a fluororesin excellent in chemical resistance is preferable, and PTFE is particularly preferable.

  When a colored resin such as polyimide is used as the heat resistant resin, the resin tends to absorb light when irradiated with light including visible light. In this case, a laminate having high interlayer adhesive strength may be obtained by melting the fluororesin (b) in a short time and without melting the PTFE layer. However, in this case, the heat resistant resin layer may be softened and deformed.

  In addition, when the layer (C) is the same layer as the layer (A), that is, the heat-resistant resin layer is a PTFE layer, for example, the layer (A) and the layer (C) may be connected. For example, as shown in FIG. 2, when the lining sheet 30 is formed from a single PTFE film, the layer (B) 34 may exist at the joint of the PTFE film. From the perspective of the broken line portion, as shown in FIG. 3, since it can be said that the layer (A) 32, the layer (B) 34, and the layer (C) 32 are laminated in this order, In some cases, the laminate of the present invention is used.

As shown in FIG. 2, when joining (welding) the end faces of one PTFE film, conventionally, a part of the joining surface of the PTFE film 42 is previously opened as shown in FIG. Pre-processing (the groove processing unit 47) was performed, and a PFA rod 44 or the like was disposed therein, and welding was performed by melting the PFA rod 44 or the like.
However, in such a welding method, since the weld / joint surface is narrow, the welded portion tends not to have sufficient strength, and after welding, the PTFE film surface and the welded portion are flush with each other. In some cases, a step of flattening the portion is necessary.

  On the other hand, according to the method including the step 1, since the joining surfaces of the PTFE film can be surface-bonded (surface welding), the welded portion has sufficient strength and is flattened after welding. Since a process such as a treatment is not necessary, the PTFE film can be easily welded with high productivity.

  The layer (C) is not particularly limited, but is preferably formed using a heat resistant resin film. In this case, for example, when a polyimide film is used, a conventionally known surface modification treatment such as corona discharge treatment, blast treatment, primer treatment, plasma treatment is performed in order to increase the adhesive strength with the layer containing the fluororesin (b). It is preferable to use a film subjected to the above.

  The layer (C) is a range in which various additives that can be blended in a normal resin layer such as an antioxidant, an anti-aging agent, and an ultraviolet absorber are added in accordance with a desired application without impairing the purpose and effect of the present invention. You may contain.

In addition, since the fluororesin (b) may be melted in a short time without melting the layer (A), a laminate having high interlayer adhesion strength may be obtained. (C) may contain the following visible light absorber as long as the effects of the present invention are not impaired.
When the layer (C) thus contains a visible light absorber, the visible light absorber may be uniformly (uniformly) dispersed in the layer (C), and any one of the layers (C). The visible light absorber may be present on the side of the surface or in the central portion in the thickness direction of the layer (C), but this visible light absorber can fuse the fluororesin (b) contained in the layer (B). In consideration of blending to help and preventing the entire layer (C) from melting and deforming, the layer side containing the fluororesin (b) of the layer (C) (16b side in FIG. 1) It is preferable to exist unevenly.

  The thickness of the layer (C) may be appropriately selected according to the desired application, and is not particularly limited, but is preferably 0.02 to 30 mm, more preferably 0.1 to 10 mm.

<Layer containing fluororesin (b)>
The layer containing the fluororesin (b) (hereinafter also simply referred to as “layer (B)”) is a layer containing the fluororesin (b) that can be fused to an adjacent layer by irradiation with light containing visible light. There is no particular limitation.
In the laminated body of the present invention, the layers (A) and (C) are firmly fused by the layer (B) via the layer (B). Further, when the layer (A) is used in an application in contact with a liquid, and the liquid has a property of deteriorating the resin, the layer (B) contains a fluororesin, so that the liquid is the layer. Even if it passes through (A), the layer (C) can be protected by the interposition of this layer (B).

  The melting point of such a fluororesin (b) measured by differential scanning calorimetry (DSC) is such that the layer (A) and (C) can be more firmly fused to obtain a laminate, From the viewpoint of corrosion resistance, etc., the melting point is preferably less than the melting point of PTFE (about 327 ° C.), more preferably the melting point is less than the melting point of PTFE and the heat-resistant resin, and more preferably 160 to 320 ° C. Especially preferably, it is 260-315 degreeC.

  More specifically, the melting point of the fluororesin (b) is preferably minus the melting point of PTFE in terms of obtaining a laminate having the above-described effect without melting the layers (A) and (C). It is 150-5 degreeC, More preferably, it is minus 50-10 degreeC. Moreover, the melting point of the fluororesin (b) is preferably a melting point of the heat resistant resin minus 150 to 5 ° C, more preferably minus 50 to 10 ° C.

  The melt flow rate (MFR) of the fluororesin (b) is preferably 20 g / 10 min or less from the viewpoint that it can be easily fused with the layers (A) and (C) by melt flow. More preferably, it is more preferably 2 g / 10 minutes or less. MFR is measured under the conditions of 372 ° C. and load of 5 kg in accordance with JIS K7210.

  Specific examples of the fluororesin (b) include PFA (melting point: about 302 to 310 ° C.), tetrafluoroethylene-hexafluoropropylene copolymer (FEP, melting point: about 255 to 265 ° C.), polyvinylidene fluoride (PVDF, melting point) About 172 to 177 ° C.), polyvinyl fluoride (PVF, melting point about 160 to 220 ° C.), poly (chlorotrifluoroethylene) (PCTFE, melting point about 210 to 212 ° C.), ethylene-tetrafluoroethylene copolymer (ETFE, Among these, since PFA is excellent in thermal properties, mechanical properties, chemical properties, and electrical properties, a laminate having these properties can be obtained, and the layer (A PFA is preferable from the viewpoint that the laminate of the present invention having the above-described effects can be obtained without melting (C) and (C).

  PFA is a copolymer obtained by suspension polymerization, emulsion polymerization or solution polymerization using tetrafluoroethylene and perfluoroalkyl vinyl ether as monomers, and the PFA is a structural unit derived from tetrafluoroethylene. 1 to 99% by weight and 99 to 1% by weight of structural units derived from perfluoroalkyl vinyl ether. However, the total of the structural unit derived from tetrafluoroethylene and the structural unit derived from perfluoroalkyl vinyl ether is 100% by weight.

  When the layer (B) is formed, a layer previously formed into a film shape by a conventionally known method may be used, or a PFA powder paint or the like may be used. In order to form the layer (B) using the PFA powder coating material, the layer (A) or the layer (C) may be applied by a conventionally known method.

  The layer (B) contains various additives that can be blended in a normal resin layer such as an antioxidant, an anti-aging agent, and an ultraviolet absorber according to a desired application within a range that does not impair the effects of the present invention. May be.

In addition, from the viewpoint of melting the fluororesin (b) in a short time and without melting the layers (A) and (C), and obtaining a laminate having high interlayer adhesion strength. The layer (B) preferably contains a visible light absorber.
In this case, the visible light absorber may be uniformly dispersed in the layer (B), or may be present unevenly on the surface or inside of the layer (B).

The visible light absorber is not particularly limited as long as it is a material that can absorb visible light. For example, pigments such as phthalocyanine pigments, azo pigments, black pigments (eg, carbon black, titanium black), ethyl violet, Examples thereof include dyes such as crystal violet, azo dyes, anthraquinone dyes, and cyanine dyes, and colored metal oxides such as iron oxide and copper oxide.
Among these, carbon black is preferable from the viewpoint that a laminate having excellent heat resistance and high interlayer adhesion strength can be obtained without impairing the physical properties of the layer (A) or the fluororesin (b). .

The shape of the visible light absorber is not particularly limited, and examples thereof include a particulate shape (including spherical and elliptical spheres), a flat shape, a columnar shape, a needle shape (including a tetrapot shape and a dendritic shape), and an indefinite shape. .
The average particle diameter of the visible light absorber is not particularly limited and may be appropriately selected depending on the purpose.

  The content of the visible light absorber is not particularly limited as long as the effect of the present invention is not impaired, but is preferably 0.1 to 10 parts by mass with respect to 100 parts by weight of the fluororesin (b), It is more preferable that it is 3-7 mass parts.

  What is necessary is just to select the thickness of the said layer (B) suitably according to a desired use, and if a layer (A) and (C) fuse | melt, it will not restrict | limit in particular.

<Step 1>
In the step 1, the layer (A) and the layer (C) are laminated via the layer (B), and visible light is applied to the layer (B) from the layer (A) or the layer (C) side. It is the process of irradiating the light containing.

As a method of laminating the layers (A) to (C), preferably
(I) A method of laminating the film-like layer (A) and the layer (C) via a film containing the fluororesin (b) and a visible light absorber, or the film-like layer (A) or On the layer (C), a paint containing the fluororesin (b) and a visible light absorber is applied, heated as necessary, and then the other film (layer (A) or layer ( C))
(Ii) A method of laminating the film-like layer (A) and the layer (C) via a film (not containing a visible light absorber) containing the fluororesin (b), or the film-like layer On (A) or (C), a paint containing the fluororesin (b) (not containing a visible light absorber) is applied, heated as necessary, and another film ( A method of laminating the layer (A) or the layer (C)),
Is mentioned.

  In the method (i), since a visible light absorber is contained in the layer (B), a desired lamination can be performed in a short time without impairing the properties of the PTFE layer, the fluororesin (b), and the heat resistant resin layer. You can get a body.

  In Step 1, light containing visible light can be obtained in a short time and a desired laminate can be obtained without impairing the properties of the PTFE layer, the fluororesin (b) and the heat resistant resin layer. It is preferable that it is a step of irradiating light on the side opposite to the layer to be irradiated using a layer that helps melt the fluororesin (b).

  In addition, as a layer which assists melting | fusing of the said fluororesin (b), as shown, for example in FIG. 5, the layer (layer (layer (12)) on the opposite side to the layer (layer (A) 12) irradiated with light. C) A layer 18 (for example, a polyimide film or a metal plate) provided on the side surface 16a opposite to the layer (B) 14 side of 16) may be used. Further, as described above, when a layer containing a colored resin such as polyimide or a layer containing a visible light absorber is used as the heat resistant resin layer, the heat resistant resin layer is the fluororesin (b ) Also helps to melt. Furthermore, you may use together these heat resistant resin layers and layers, such as a layer which helps melting | fusing of the said fluororesin (b).

  In the method (i), since the visible light absorber is contained in the layer (B), PTFE, fluorine can be obtained in a short time without using a layer that aids the melting of the fluororesin (b). Although a desired laminate can be obtained without impairing the properties of the resin (b) and the heat-resistant resin, even with the method (i), a layer that helps melt the fluororesin (b) It may be used.

  In the method (ii), a heat-resistant resin layer containing a colored resin such as polyimide or a visible light absorber is provided for the purpose of producing the same effect as that of the method (i) upon light irradiation. 5 may be used, but when the layer 18 such as the layer 18 in FIG. 5 is irradiated with light, the layer 18 absorbs visible light, so that the fluororesin (b) is melted. It is preferable to make it easy to do.

  The light including visible light is not particularly limited as long as it includes visible light, but preferably has a wavelength of 0.4 to 5 μm from the viewpoint that the resins constituting the layers (A) to (C) are not easily deteriorated. Light, more preferably 0.4 to 2 μm is mentioned.

The light source used for the light irradiation is not particularly limited, and may be a laser, but can irradiate a large area (eg, 1 m ² or more) at a time, and is excellent in on-site workability. Therefore, high-intensity discharge lamps and halogen lamps are more preferable, and since they have a continuous spectrum from ultraviolet to infrared, light of a desired wavelength can be easily selected, with low power consumption and long life. For some reasons, a xenon lamp is more preferable.

The integrated light quantity upon the light irradiation is not particularly limited as long as the fluororesin (b) is melted, but is preferably 10 to 3600 mJ / cm ² , more preferably 30 to 120 mJ / cm ² .

  In the case of the light irradiation, light may be irradiated from either one of the layer (A) side and the layer (C) side, or light may be irradiated from both sides. However, when a layer containing a colored resin such as polyimide or a layer containing a visible light absorber is used as the layer (C), it is preferable to irradiate light from the layer (A) side.

  At the time of light irradiation, it is preferable to use a material that does not absorb light to be used, such as a glass plate, and fuse each layer while applying pressure in the stacking direction of the stack.

  EXAMPLES Hereinafter, although an Example demonstrates this invention further in detail, this invention is not limited at all by these Examples.

[Example 1]
A PFA film containing carbon having a thickness of 20 μm (carbon content: 5) as a layer containing a fluororesin (b) between two PTFE sheets having a thickness of 2 mm (referred to as a PTFE layer and a heat-resistant resin layer, respectively). (Mass%) and lightly crimped with quartz glass, and then irradiated with light for 2 minutes using a halogen lamp (HSH-35) manufactured by Fintech Tokyo (light other than wavelengths of 300 to 900 nm is a color filter) To obtain a laminate.
After cooling to room temperature, the quartz glass was removed. The respective layers of the laminate were well adhered (peel strength of 1 kg / cm or more in a 180 ° peel test based on JIS Z 0237).

[Example 2]
In Example 1, a PFA film having a thickness of 20 μm was used as the layer containing the fluororesin (b), and the irradiation time of the halogen lamp was set to a condition (15 minutes) for the fusion between the layers, which was the same as in Example 1. Thus, a laminate was produced.
The respective layers of the obtained laminate were well bonded (peel strength of 1 kg / cm or more in a 180 ° peel test based on JIS Z 0237).

[Comparative Example 1]
In Example 1, a laminate was produced in the same manner as in Example 1 except that the layer containing the fluororesin (b) was not used.
In the obtained laminate, each layer was not bonded.

10: Laminate 12: PTFE layer (A)
14: Layer (B) containing fluororesin (b)
16: Heat resistant resin layer (C)
18: Layer that aids melting of fluororesin (b) 30: Lining sheet 32: PTFE film (PTFE layer (A) and heat-resistant resin layer (C))
34: Layer (B) containing fluororesin (b)
40: Cross section of welded portion when welding by conventional welding method 42: PTFE film 44: PFA rod 47: groove treatment portion

Claims (9)

  A polytetrafluoroethylene (PTFE) layer (A), a layer (B) containing a fluororesin (b) that can be fused to an adjacent layer by irradiation with light including visible light, and a heat-resistant resin layer (C) (however, The layers (A) and (C) are different from the layer (B) respectively) in this order. The laminate according to claim 1, which is obtained by a method comprising the following step 1.
Step 1: Laminate the layer to be the PTFE layer and the heat resistant resin layer via the layer containing the fluororesin (b), and the layer side to be the PTFE layer on the layer containing the fluororesin (b) or The process of obtaining the laminated body which the said PTFE layer and the heat resistant resin layer fuse | melted through the layer containing a fluororesin (b) by irradiating the light containing visible light from the layer side used as the heat resistant resin layer   The laminate according to claim 1 or 2, wherein the fluororesin (b) is a tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA).   The laminated body of any one of Claims 1-3 in which the said layer (B) contains a visible light absorber.   3. The step 1 is a step of irradiating light on a side opposite to a layer irradiated with light including visible light using a layer that helps melt the fluororesin (b). The laminated body of any one of -4.   The laminate according to any one of claims 1 to 5, wherein the heat-resistant resin layer (C) contains a heat-resistant resin, and the melting point of the resin is equal to or higher than the melting point of the fluororesin (b).   The laminate according to any one of claims 2 to 6, wherein the step 1 is a step of irradiating light including visible light using a high-intensity discharge lamp or a halogen lamp.   The layer that becomes the PTFE layer and the layer that becomes the heat resistant resin layer are laminated via the layer that contains the fluororesin (b), and the layer side that becomes the PTFE layer or the heat resistant resin layer on the layer that contains the fluororesin (b) Including a step 1 of obtaining a laminate in which the PTFE layer and the heat-resistant resin layer are fused via a layer containing a fluororesin (b) by irradiating light containing visible light from the layer side to be The manufacturing method of the laminated body of any one of claim | item 1 -7.   9. The step 1 is a step of irradiating light on a side opposite to a layer irradiated with light containing visible light by using a layer that aids melting of the fluororesin (b). The manufacturing method of the laminated body as described in any one of.

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