JP5650419B2 - 3-layer adhesive - Google Patents

Description

  The present invention relates to a three-layer adhesive body.

Conventionally, in the field of automobile parts and electronic / electrical parts, an adhesive body in which resin materials are laminated and bonded is often used.
In Patent Document 1, when different types of synthetic resin materials are overlapped and bonded together, one of the different types of synthetic resin materials is made non-absorbable with respect to the laser beam, and the other is used as the laser beam. A synthetic resin material of a different type characterized by irradiating a laser beam from the direction of a synthetic resin material that is non-absorbable with respect to the laser beam after superimposing the two synthetic resin materials. A joining method is disclosed.
Patent Document 2 includes an absorption coefficient εj for a laser beam of 940 nm by containing at least one thermoplastic resin selected from a polyamide resin, a polycarbonate resin, and a polypropylene resin and a weak laser beam absorber. 200 to 8000 (1 / cm), and the laser light weakly absorbable molding member that absorbs at least a part of the laser light and transmits another part may be single and bent to at least partly Welding with heat generated by absorbing a part of the laser beam irradiated to the laser beam and transmitting another part of the laser beam while being overlapped or overlapping at least a part of each of the plurality A laser welded body is disclosed which is characterized by the above.

JP-A-60-214931 JP 2008-1112 A

However, in order to obtain an adhesive body having three or more layers in the conventional methods as shown in Patent Documents 1 and 2, the two layers are first bonded by laser, and then the third layer is bonded by laser. It was necessary to let them.
There has been an urgent need in the art to simplify the bonding process using a laser when obtaining an adhesive body having three or more layers.

  As a result of intensive investigations to solve the above problems, the present inventors have bonded the materials of the semi-transmissive and semi-absorbent layers and the transmissive layer using a laser, even in the case of three or more layers, The present invention was completed by finding a simple method capable of obtaining an adhesive body in which three layers were laminated by one laser irradiation.

That is, the present invention is as follows.
[1]
A three-layer adhesive body in which a first layer, a second layer, and a third layer are sequentially laminated,
The first to third layers are (a) a thermoplastic resin having a transmittance of 50% or more and a reflectance of 13% or more at a wavelength of 800 to 1100 nm, or (b) a transmittance of 50 at a wavelength of 800 to 1100 nm. % Of a thermoplastic resin having a reflectance of 5% or more and less than 13%,
(A) A three-layer adhesive body in which layers made of a thermoplastic resin are not continuously laminated.
[2]
The three-layer adhesive body according to [1], wherein the (b) thermoplastic resin contains a colorant.
[3]
[2] The colorant contains nigrosine and / or naphthalocyanine, and further contains a colorant selected from aniline black, phthalocyanine, porphyrin, perylene, quaterylene, azo dye, anthraquinone, squaric acid derivative, and immonium dye. The three-layer adhesive body described.
[4]
The three-layer adhesion according to any one of [1] to [3], wherein the first layer is made of the (a) thermoplastic resin, and the second layer is made of the (b) thermoplastic resin. body.
[5]
The three-layer adhesive body according to any one of [1] to [4], wherein the thermoplastic resins (a) to (c) include a polyamide resin.
[6]
The three-layer adhesive body according to any one of [1] to [5], wherein the layer thickness of the (b) thermoplastic resin layer is 5 mm or less.
[7]
The three-layer adhesive body according to any one of [1] to [6], which is welded.
[8]
The method for producing a three-layer adhesive body according to any one of [1] to [7].
[9]
The method for producing a three-layer bonded body according to [8], wherein the three layers are bonded by irradiating laser light from the first layer side.
[10]
The method for producing a three-layer adhesive body according to [9], wherein the laser light has an oscillation wavelength of 800 to 1100 nm.

  According to the present invention, it is possible to provide a three-layer bonded body obtained by one-time laser irradiation in which a semi-transmissive and semi-absorbent layer and a transmissive layer are combined.

The schematic diagram of the 3 layer adhesive body of this invention is shown. The three-layer adhesive body is shown in five embodiments (A) to (E). In FIG. 1, a white layer represents a layer made of (a) a thermoplastic resin, and a shaded layer represents (b) a layer made of a thermoplastic resin. In addition, the laser irradiation direction is shown as an example, but the laser irradiation direction is not limited to the case where the laser irradiation is performed perpendicular to the layer, and it means that the laser irradiation is performed from the first layer side. In the embodiment of (A), the first layer is (a) a layer made of a thermoplastic resin, and the second layer and the third layer are (b) a layer made of a thermoplastic resin. In the embodiment of (B), the first layer and the third layer are (b) a layer made of a thermoplastic resin, and the second layer is (a) a layer made of a thermoplastic resin. In the embodiment of (C), the first layer and the second layer are (b) a layer made of a thermoplastic resin, and the third layer is (a) a layer made of a thermoplastic resin. In the embodiment of (D), the first layer and the third layer are (a) a layer made of a thermoplastic resin, and the second layer is (b) a layer made of a thermoplastic resin. In the embodiment of (E), the first layer to the third layer are layers made of (b) a thermoplastic resin. The schematic diagram in a comparative example is shown. In (F), the first layer and the second layer are (a) a layer made of a thermoplastic resin, and the third layer is (b) a layer made of a thermoplastic resin. In (G), the first to third layers are all (a) layers made of a thermoplastic resin. In (F) and (G), (a) layers made of thermoplastic resin are continuously laminated.

  Hereinafter, a mode for carrying out the present invention (hereinafter referred to as “the present embodiment”) will be described in detail. In addition, this invention is not limited to the following embodiment, It can implement by changing variously within the range of the summary.

The three-layer adhesive body of the present embodiment is a three-layer adhesive body in which a first layer, a second layer, and a third layer are sequentially laminated,
The first layer, the second layer, and the third layer are (a) a thermoplastic resin having a transmittance of 50% or more and a reflectance of 13% or more at a wavelength of 800 to 1100 nm, or (b) a wavelength of 800 to 1100 nm. And a thermoplastic resin having a transmittance of 50% or more and a reflectance of 5% or more and less than 13%,
(A) A three-layer adhesive body in which layers made of a thermoplastic resin are not continuously laminated.
In the three-layer laminate, (a) that the layers made of the thermoplastic resin are not continuously laminated means that the first layer and the second layer, or the second layer, as the three-layer laminate of the present embodiment. This means that (a) the layer and the third layer are not included in the case of (a) a layer made of a thermoplastic resin having a transmittance of 50% or more and a reflectance of 13% or more at a wavelength of 800 to 1100 nm. That is, (a) the case where the layers made of the thermoplastic resin are continuously laminated is that the first layer and the second layer are (a) the layers made of the thermoplastic resin, and the third layer is In the case of (b) a layer made of a thermoplastic resin, the first layer is (b) a layer made of a thermoplastic resin, and the second layer and the third layer are (a) a layer made of a thermoplastic resin. In some cases, the first to third layers are all (a) layers made of a thermoplastic resin, and these are not included in the present embodiment.

The three-layer adhesive body according to the present embodiment will be described with reference to FIG. 1. The first layer, the second layer, and the third layer are sequentially laminated. It means that it is laminated as exemplified in E).
In the three-layer adhesive body, the second layer is stacked in contact with the third layer, and the first layer is stacked in contact with the second layer. In the three-layer adhesive body, the third layer and the second layer are bonded, and the second layer and the first layer are bonded.
In the present embodiment, since the third layer and the second layer can be bonded together, and the second layer and the first layer can be bonded simultaneously, a three-layer bonded body is manufactured by a simple method. be able to. In the three-layer adhesive body, it is preferable that the three-layer bonded body is fused by laser light irradiation in order to bond the bonding surface more firmly.

  (A) The layer made of a thermoplastic resin is used as a laser transmission layer because it has a transmittance of 50% or more and a reflectance of 13% or more at a wavelength of 800 to 1100 nm, and (b) consists of a thermoplastic resin. Since the layer has a transmittance of 50% or more and a reflectance of 5% or more and less than 13% at a wavelength of 800 to 1100 nm, it is used as a laser semi-transmissive semi-absorbing layer.

In the present embodiment, the transmittance means the ratio of incident light having a characteristic wavelength in the optical and spectroscopic methods, and the reflectance means the incident light having a characteristic wavelength in the optical and spectroscopic methods. It means the ratio of reflection.
Transmittance and reflectance can be measured using a spectrophotometer such as a V-670 integrating sphere ultraviolet visible near infrared spectrophotometer, as described in the examples below.

As a main material of the thermoplastic resin (a) and (b) used in the present embodiment, a known resin or the like having a laser beam transparency and used as a dispersant for a colorant is used. Can be used.
In the present embodiment, the “main material” means a main component as a constituent component of the thermoplastic resin. (A) In the case of a thermoplastic resin, the transmittance is 50% or more at a wavelength of 800 to 1100 nm. Although it will not specifically limit if it is contained so that it may be a thermoplastic resin with a reflectance of 13% or more, (a) In the thermoplastic resin, it is preferably 50% or more, 60% or more as mass%. 70% or more, 80% or more, 90% or more, 95% or more, 100%. In the case of (b) a thermoplastic resin, it is particularly limited as long as it is contained so as to be a thermoplastic resin having a transmittance of 50% or more and a reflectance of 5% or more and less than 13% at a wavelength of 800 to 1100 nm. Although it is not a thing, Preferably it contains 50% or more, 60% or more, 70% or more, 80% or more, 90% or more, 95% or more, 99.5% or more. When (a) the thermoplastic resin and (b) the thermoplastic resin can be a thermoplastic resin within the above-described transmittance and reflectance ranges, other components may be included. Further, as will be described later, when the thermoplastic resin (b) includes a colorant, the main resin component and the colorant may be included so that the main resin component and the colorant are 100% by mass. For example, when (a) the thermoplastic resin and (b) the thermoplastic resin contain 95% or more of the main resin component in mass%, the resin as the main material is contained in an amount of 95 to 100%. (A) Thermoplastic Other components may be contained so as to be 100% as the resin and (b) the thermoplastic resin. In this case, when 100% of the resin as the main material is included, (a) the thermoplastic resin and (b) the thermoplastic resin are thermoplastic resins made of the resin as the main material.

  Such a resin is not particularly limited. For example, polyamide resin, polycarbonate resin, polyphenylene sulfide resin (PPS), polyolefin resin such as polyethylene resin or polypropylene resin, polyethylene terephthalate (PET) resin or polybutylene terephthalate. Polyester resin such as (PBT) resin, polystyrene resin, polymethylpentene resin, methacrylic resin, ethylene vinyl alcohol (EVOH) resin, polyacetal resin, polyvinyl chloride resin, polyvinylidene chloride resin, polyphenylene oxide resin, polyarylate resin, poly Allyl sulfone resin, fluororesin, ABS resin, AS (acrylonitrile-styrene) copolymer resin, BBS (acrylonitrile-butadiene-styrene) copolymer Resin, AES (acrylonitrile-EPDM-styrene) copolymer resin, PA-PBT copolymer, PET-PBT copolymer resin, PC-PBT copolymer resin, PC-PA copolymer resin, liquid crystal polymer, etc. Is mentioned.

  These resins may be used alone or as a mixture of two or more of the same or different kinds of resins. These resins may be copolymerized resins.

  The resin as the main material of the thermoplastic resins (a) and (b) is preferably a polyamide resin, a polycarbonate resin, an ABS resin, an AS resin, a polyphenylene sulfide resin, a polybutylene terephthalate resin, and a polypropylene resin. From the viewpoint of compatibility with the colorant, a polyamide resin, a polycarbonate resin, an ABS resin, and an AS resin are more preferable.

Among them, it is preferable to use a polyamide resin because it is excellent in permeability and suitable as a material for laser bonding.
The polyamide resin is not particularly limited as long as it is a polymer having an amide bond (—NHCO—) in the main chain. For example, polycaprolactam (nylon 6), polytetramethylene adipamide (nylon 46), polyhexamethylene Adipamide (nylon 66), polyhexamethylene sebamide (nylon 610), polyhexamethylene dodecamide (nylon 612), polyundecamethylene adipamide (nylon 116), polyundecalactam (nylon 11), Polydodecalactam (nylon 12), polytrimethylhexamethylene terephthalamide (nylon TMHT), polyhexamethylene isophthalamide (nylon 6I), polynonanemethylene terephthalamide (9T), polyhexamethylene terephthalamide (6T), polybis 4-aminocyclohexyl) methane dodecamide (nylon PACM12), polybis (3-methyl-aminocyclohexyl) methane dodecamide (nylon dimethyl PACM12), polymetaxylylene adipamide (nylon MXD6), polyundecamethylene hexahydroterephthalamide (Nylon 11T (H)) and a polyamide copolymer containing at least two different polyamide components or a mixture thereof.
The presence or absence of an amide bond can be confirmed by an infrared absorption spectrum (IR).

  The polyamide resin may be a mixed polymer of a polyamide resin and another synthetic resin. Examples of the mixed polymer include a polyamide / polyester mixed polymer, a polyamide / polyphenylene oxide mixed polymer, and a polyamide / polycarbonate. Examples thereof include a mixed polymer, a polyamide / polyolefin mixed polymer, a polyamide / styrene / acrylonitrile mixed polymer, a polyamide / acrylic ester mixed polymer, and a polyamide / silicone mixed polymer.

  The resin as the main material of the thermoplastic resin of (a) and (b) may be the same or different resin, but the same resin is used as the main material from the viewpoint of adhesiveness (a It is preferable to use the thermoplastic resins of (b) and (b).

  (A) As a thermoplastic resin, the resin composition is particularly limited as long as it is a resin that transmits a laser, that is, a transmittance of 50% or more at a wavelength of 800 to 1100 nm and a reflectance of 13% or more at a wavelength of 800 to 1100 nm. However, it is preferable to include a resin as the main material, and more preferably a thermoplastic resin made of a resin as the main material. (A) As a thermoplastic resin, the transmittance is preferably 60% or more at a wavelength of 800 to 1100 nm, and the reflectance is preferably 15% or more. Further, (a) the thermoplastic resin is preferably in the range of the above transmittance and reflectance at a wavelength of 940 to 1060 nm. (A) The thermoplastic resin may have a transmittance of 20% or more at a wavelength of 400 to 1200 nm.

(B) As a thermoplastic resin, a resin that semi-transmits and absorbs a laser, that is, a transmittance of 50% or more at a wavelength of 800 to 1100 nm, and a reflectance of 5% or more and less than 13% at a wavelength of 800 to 1100 nm, The resin composition is not particularly limited, but preferably contains a colorant in addition to the resin as the main material. (B) The transmittance at a wavelength of 800 to 1100 nm is preferably 50 to 70%, more preferably 55 to 65% from the viewpoint of the welding strength of the experimental results. The reflectance at a wavelength of 800 to 1100 nm is preferably 6% or more, more preferably 10% or more, from the viewpoint of the welding strength of the experimental results. Moreover, it is preferable that it is the range of the said transmittance | permeability and reflectance with a wavelength of 940-1060 nm as a thermoplastic resin (b). (B) The thermoplastic resin may have a wavelength of 600 nm or less and a transmittance of 5% or less.
The colorant is not particularly limited as long as the (b) thermoplastic resin is a material having a wavelength of 800 to 1100 nm and a transmittance of 50% or more and a reflectance of 5% or more and less than 13%. Examples thereof include nigrosine, naphthalocyanine, aniline black, phthalocyanine, porphyrin, perylene, quaterylene, azo dyes, anthraquinones, squaric acid derivatives, and immonium dyes.
From the viewpoint of adhesion to the layer made of the thermoplastic resin (a) and (b), the colorant contains nigrosine and / or naphthalocyanine, and further contains aniline black, phthalocyanine, porphyrin, perylene, quaterrylene, azo dye , Anthraquinone, a squaric acid derivative, and a colorant containing a colorant selected from immonium dyes are preferred, and specific examples include eBind ACW-9871 which is a colorant manufactured by Orient Chemical Industries.

  When these colorants are contained in the thermoplastic resin (b) as a mass%, preferably 0.01 to 0.04%, more preferably 0.02 to 0.03%, and transmission at a wavelength of 800 to 1100 nm. The reflectance is 50% or more, and the reflectance can be 5% or more and less than 13%. (B) When the thermoplastic resin contains a colorant, the resin as the main material contains 95% or more of the resin as the main material, for example, when the thermoplastic resin contains 95% or more by mass%, (b ) Other components such as a colorant may be contained so as to be 100% as the thermoplastic resin.

  In addition to the above, the thermoplastic resins (a) and (b) may contain a filler such as glass fiber, a heat stabilizer, and the like.

In the present embodiment, the method for producing a three-layer adhesive body can be performed as follows.
Using the thermoplastic resins (a) and (b), a molded piece made of each thermoplastic resin is produced by a conventionally known method.
The molded piece can be produced using an apparatus such as extrusion molding, press molding, or injection molding machine.
Such a molded piece can be used as the layer made of the thermoplastic resin of (a) and (b), but the shape of these molded pieces is not particularly limited and is suitable for applications using a three-layer adhesive body. It suffices to have a different shape.
The layers made of the thermoplastic resins (a) and (b) may be in contact with each other as a laminate as shown in FIG. 1, and contact within a range where the three layers can be sufficiently adhered by a laser. It is only necessary to have a structure having
After obtaining the three-layer adhesive body, it may be molded into a desired shape, and the layer made of the thermoplastic resin (a) and (b) molded into the desired shape is defined as a three-layer adhesive body according to the present invention. Also good.

  The thickness of each layer obtained by molding the thermoplastic resins (a) and (b) is preferably 5 mm or less, more preferably 0.5 to 5 mm, and even more preferably 1.5 to 2.5 mm.

(B) The layer made of thermoplastic resin is a semi-transmissive and semi-absorbing layer, and the layers can be bonded by laser irradiation. Therefore, (b) the layer made of thermoplastic resin is (b) thermoplastic resin. The layer which consists of may be the layer which laminated | stacked.
The case of (A) in FIG. 1 will be described as an example. The second layer and the third layer are (b) layers made of a thermoplastic resin. For example, the second layer is a laminated layer. In this case, the second layer is composed of (b) a layer made of a thermoplastic resin to be laminated, and the first layer and the first layer and Three layers may be laminated and irradiated with a laser, and bonded as a second layer by laser irradiation, and may be bonded to the first layer and the third layer. In addition, the second layer laminated by adhesion using a molded body of a layer made of a thermoplastic resin (b) in advance before adhesion of the second layer to the first layer and the third layer. Then, it may be bonded to the first layer and the third layer.
(B) When the layers made of thermoplastic resin are laminated layers, the laminated layers may be bonded by laser irradiation, and through an adhesive layer containing an adhesive, a pressure-sensitive adhesive, and the like. It may be a bonded second layer.
(B) When it consists of a layer which the layer which consists of thermoplastic resins laminated | stacked, it is preferable that the layer thickness of the layer which consists of (b) thermoplastic resins is 5 mm or less.
In the case of the embodiment of (A) and (C) shown in FIG. 1, the three-layer adhesive body is not particularly limited as long as it contains (b) two or more layers made of thermoplastic resin in succession. Absent. Moreover, in the case of the aspect of (E) shown in FIG. 1, it will not specifically limit if (b) three or more layers which consist of a thermoplastic resin are included continuously.

  In the present embodiment, the three-layer adhesive body is combined with each other of the first layer, the second layer, and the third layer by combining materials of the semi-transmissive and semi-absorbent layers and the transmissive layer. It can be obtained by a single laser irradiation without using an agent, etc., but an adhesive, a pressure sensitive adhesive, etc. are applied between the first layer and the second layer and between the second layer and the third layer. An adhesive layer may be provided.

After bringing the first layer to the third layer to be bonded into contact with each other, laser irradiation is performed to bond the first layer to the third layer.
Laser irradiation can be made into a three-layer adhesive body in which the first layer to the third layer are adhered to each other by irradiating the first layer to the third layer with laser from the first layer side. .
Laser irradiation from the first layer side means from the first layer side so that the laser beam reaches the bonding surface of the first layer and the second layer, and the second layer and the third layer. It means that laser irradiation is performed toward the third layer side.

In the three-layer adhesive body of (A) shown in FIG. 1, (a) the laser beam that has passed through the layer made of the thermoplastic resin (first layer) is transmitted to the second layer and the third layer (b). It reaches the layer made of the thermoplastic resin, and (b) the layer made of the thermoplastic resin is heated and melted, whereby (a) the layer made of the thermoplastic resin (first layer) and (b) made of the thermoplastic resin. The layer (second layer) is also bonded to (b) a layer made of a thermoplastic resin (second layer) and (b) a layer made of a thermoplastic resin (third layer).
In the three-layer adhesive body of (B) shown in FIG. 1, since the layer (first layer) made of thermoplastic resin (b) is a semi-transmissive and semi-absorbing layer, the laser beam is (a) thermoplastic. Since the second layer is a transmission layer that is transmitted through the resin layer (second layer), the laser beam transmitted through the second layer is (b) a layer of thermoplastic resin (third layer). ), And (b) the layer made of the thermoplastic resin is heated and melted, whereby the first layer and the third layer are respectively (a) the layer made of the thermoplastic resin (second layer) and Adhering to form a three-layer adhesive body.
In the three-layer adhesive body (C) shown in FIG. 1, since the layer (b) made of the thermoplastic resin is a semi-transmissive semi-absorbing layer, the laser light is transmitted to the layer (a) made of the thermoplastic resin. (B) when the layer made of the thermoplastic resin is heated and melted, the first layer and the second layer are bonded, and (b) the layer made of the thermoplastic resin (second layer) and ( a) A layer (third layer) made of a thermoplastic resin is bonded to form a three-layer bonded body.
In the three-layer adhesive body of (D) shown in FIG. 1, since the layer made of (a) the thermoplastic resin is a transmission layer, the laser beam is transmitted to the layer made of (b) the thermoplastic resin. b) When the layer made of the thermoplastic resin is heated and melted, (a) the layer made of the thermoplastic resin (first layer) and (b) the layer made of the thermoplastic resin (second layer) are bonded. . In addition, since the second layer is a semi-transmissive and semi-absorbing layer, the laser light is transmitted, and (a) the second layer generates heat on the adhesive surface with the layer made of the thermoplastic resin (third layer). Melting and bonding with the third layer forms a three-layer adhesive.
In the three-layer adhesive body of (E) shown in FIG. 1, (b) the layers (the first layer to the third layer) made of a thermoplastic resin are heated and melted, whereby the first layer and the second layer are formed. The second layer and the third layer are bonded to each other to form a three-layer adhesive body.

The laser used in this embodiment is not particularly limited, but is the first of infrared or infrared emitting solid lasers such as carbon dioxide laser, YAG laser, and semiconductor laser, and YAG lasers having an oscillation wavelength in the visible light region. Examples include a second harmonic, a copper vapor laser, an ultraviolet laser having an oscillation wavelength in the ultraviolet region, such as an excimer laser, a YAG laser converted to the third or fourth harmonic, and the laser may be continuous irradiation or pulse irradiation. .
The oscillation wavelength of the laser light is preferably 800 to 1100 nm, and more preferably 940 to 1060 nm.
Laser irradiation is preferably performed at 1 to 500 mm / s, more preferably 10 to 100 mm / s.

  Hereinafter, the present embodiment will be described more specifically with reference to examples and comparative examples. However, the present embodiment is not limited to these examples. The evaluation method used in the present embodiment is as follows.

(A) Polyamide 66 resin (Leona (registered trademark) 14G33X01 manufactured by Asahi Kasei Chemicals) was used as the thermoplastic resin.
(B) As a thermoplastic resin, polyamide 66 resin (Leona (registered trademark) 14G33X01 manufactured by Asahi Kasei Chemicals) and a colorant (eBind ACW-9871 manufactured by Orient Chemical Industries) are dry blended with polyamide 66 resin: colorant = 39: 1. The material used was used.

The transmittance and reflectance were measured using a UV-VIS V-670 integrating sphere ultraviolet-visible near-infrared spectrophotometer manufactured by Hitachi High-Technologies Corporation. As test materials, test pieces having a resin temperature of 285 ° C., a mold temperature of 80 ° C., and 120 × 80 × 1 mm were obtained using an injection molding machine (SE-150D manufactured by Sumitomo Heavy Industries).
The test piece was cut into a 36 × 30 × 1 mm test piece. The transmittance and reflectance of each test piece obtained were as follows.
(A) A test piece made of a thermoplastic resin had a transmittance of 64.6% and a reflectance of 18.0% at a wavelength of 940 nm, a transmittance of 67.2% and a reflectance of 16.0% at a wavelength of 1060 nm.
(B) A test piece made of a thermoplastic resin had a transmittance of 60.5% and a reflectance of 10.7% at a wavelength of 940 nm, a transmittance of 65.4% and a reflectance of 10.9% at a wavelength of 1060 nm.

Using each of the thermoplastic resins (a) and (b), an injection molding machine (SE-150D manufactured by Sumitomo Heavy Industries) was used to obtain test pieces having a resin temperature of 285 ° C., a mold temperature of 80 ° C., and 120 × 80 × 2 mm. It was.
The test piece was cut into a 36 × 30 × 2 mm test piece. The test specimen after cutting is laminated so as to have the layer configuration shown in Table 1, and using an optical laser device (DL × 50S ROFIN-SINAR, oscillation wavelength 940 nm), laser is irradiated from the first layer side. The three-layer adhesive body was obtained by bonding.
A flathead screwdriver was inserted between the layers of the obtained three-layer adhesive body, and force was applied to confirm whether or not welding was possible.
○: A flathead screwdriver is inserted into the gap between the members and the hammer does not break. Δ: A flathead screwdriver is inserted into the gap between the members and the hammer is broken. ×: The member leaves without applying external force.

The three-layer adhesive body of the present invention has industrial applicability as automotive parts materials such as cylinder head covers, baffle plates, thermostats, oil pans, and electronic / electrical parts materials such as substrates and LEDs.

Claims (8)

A three-layer adhesive body in which a first layer, a second layer, and a third layer are sequentially laminated,
The first to third layers are
(A) a thermoplastic resin having a transmittance of 50% or more and a reflectance of 13% or more at a wavelength of 800 to 1100 nm, or (b) a transmittance of 50% or more and a reflectance of 5% or more to less than 13% at a wavelength of 800 to 1100 nm. Made of thermoplastic resin,
The thermoplastic resin (b) contains nigrosine and / or naphthalocyanine, and further contains a colorant selected from aniline black, phthalocyanine, porphyrin, perylene, quaterylene, azo dye, anthraquinone, squaric acid derivative, and immonium dye. 0.01-0.04%,
(A) A three-layer adhesive body in which layers made of a thermoplastic resin are not continuously laminated. The three-layer adhesive body according to claim 1 , wherein the first layer is made of the (a) thermoplastic resin, and the second layer is made of the (b) thermoplastic resin. The three-layer adhesive body according to claim 1 or 2 , wherein the (a) or (b) thermoplastic resin contains a polyamide resin. The three-layer adhesive body according to any one of claims 1 to 3 , wherein a layer thickness of the layer made of the thermoplastic resin (b) is 5 mm or less. The three-layer adhesive body according to any one of claims 1 to 4 , which is welded. The manufacturing method of the 3 layer adhesion body of any one of Claims 1-5 . The manufacturing method of the 3 layer adhesion body of Claim 6 which adhere | attaches 3 layers by irradiating a laser beam from the said 1st layer side. The method for producing a three-layer adhesive body according to claim 7 , wherein an oscillation wavelength of the laser beam is 800 to 1100 nm.