JP2018168346A - Molded article, kit and manufacturing method of molded article - Google Patents

Abstract

To provide a molded article having no generation of color migration even after a treatment under a wet heat condition, and excellent in laser deposition property, a kit for manufacturing the molded article and a manufacturing method.SOLUTION: There is provided a molded article in which a transparent resin member containing a xylylene-based polyamide resin, a copper salt, at least one of halide of alkali metal and halide of alkali earth metal, and a light permeable coloring agent, and an absorption resin member containing the xylylene-based polyamide resin, the copper salt, at least one of halide of alkali metal and halide of alkali earth metal, and a light absorptive coloring agent are conjugated at a part, and a:b is 0.8:1.2 to 1.2:0.8, wherein a is total amount of the copper salt, the halide of alkali metal and the halide of alkali earth metal contained in the transparent resin member and b is total amount of the copper salt, the halide of alkali metal and the halide of alkali earth metal contained in the absorption resin member.SELECTED DRAWING: None

Description

  The present invention relates to a molded article, a kit, and a method for manufacturing the molded article.

  Polyamide resins, which are typical engineering plastics, are easy to process and are excellent in mechanical properties, electrical properties, heat resistance, and other physical and chemical properties. For this reason, it is widely used for vehicle parts, electrical / electronic equipment parts, other precision equipment parts, and the like. Recently, parts having complicated shapes have been manufactured with polyamide resin. For example, for bonding parts having a hollow portion such as an intake manifold, various welding techniques such as adhesive welding, Vibration welding, ultrasonic welding, hot plate welding, injection welding, laser welding techniques, etc. are used.

  However, the adhesion by the adhesive has a problem of environmental load such as contamination of the surroundings in addition to the time loss until curing. Ultrasonic welding, hot plate welding, and the like have been pointed out as problems such as damage to products due to vibration and heat, and post-treatment required due to generation of wear powder and burrs. In addition, injection welding often requires a special mold or molding machine, and further has a problem that it cannot be used unless the fluidity of the material is good.

  Laser welding, on the other hand, is a resin member that is transmissive (also referred to as non-absorbing or weakly absorbing) to laser light (hereinafter sometimes referred to as “transmitting resin member”) and absorbable to laser light. This is a method in which a resin member (hereinafter sometimes referred to as an “absorbing resin member”) having contact is welded and bonded to join both resin members. Specifically, it is a method in which the joining surface is irradiated with laser light from the side of the transmissive resin member, and the absorbing resin member forming the joining surface is melted and joined by the energy of the laser light. Laser welding has no generation of wear powder or burrs, less damage to the product, and since the polyamide resin itself is a material with a relatively high laser transmittance, processing of polyamide resin products by laser welding technology, It has been attracting attention recently.

  The transmissive resin member formed from the polyamide resin is usually obtained by molding a laser transmissive polyamide resin composition. As such a laser transmissive polyamide resin composition, Patent Document 1 describes (B) a reinforcing filling in which a refractive index at 23 ° C. is 1.560 to 1.600 with respect to 100 parts by weight of (A) polyamide resin. A polyamide resin composition comprising 1 to 150 parts by weight of a material, wherein at least one monomer constituting at least one of the (A) polyamide resin contains an aromatic ring, A polyamide resin composition for laser welding is described.

JP 2008-308526 A

Here, a stabilizer is also blended in a resin member (transmission resin member, absorption resin member) for laser welding. However, as a result of studies by the inventor, it has been found that when a stabilizer is added to a resin member for laser welding, a color transfer derived from the stabilizer may occur at the interface between the transparent resin member and the absorbent resin member. It was. Specifically, it was found that color transfer occurred at the interface in the molded article after being placed under wet heat conditions. Moreover, the molded article obtained by laser welding naturally requires high welding strength between the transparent resin member and the absorbing resin member.
The present invention aims to solve the above-mentioned problems, and is a molded product obtained by laser welding containing a stabilizer, even if it is a molded product after being placed under wet heat conditions, A molded product excellent in laser weldability without causing color transfer derived from the stabilizer at the interface between the transparent resin member and the absorbent resin member, and a kit for producing the molded product and a product for producing the molded product. An object is to provide a manufacturing method.

As a result of investigation by the present inventors based on the above problems, an inorganic stabilizer is used as a stabilizer, and the amount of the stabilizer contained in the transparent resin member and the absorbent resin member is set within a predetermined range. Thus, it has been found that it is possible to provide a molded article that is excellent in laser weldability and does not cause color transfer, and has completed the present invention.
Specifically, the above problem has been solved by the following means <1>, preferably <2> to <11>.
<1> Consists of structural units derived from diamine and structural units derived from dicarboxylic acid, 70 mol% or more of structural units derived from diamine are derived from xylylenediamine, and 70 mol% or more of structural units derived from dicarboxylic acid is carbon A polyamide resin derived from an α, ω-linear aliphatic dicarboxylic acid of 4 to 20, a copper salt, an alkali metal halide and an alkaline earth metal halide, and a light-transmitting dye Including a transparent resin member made of a laser-transmitting polyamide resin composition, a structural unit derived from diamine and a structural unit derived from dicarboxylic acid, and 70 mol% or more of the structural unit derived from diamine is derived from xylylenediamine, Polyamide in which 70 mol% or more of structural units derived from dicarboxylic acid are derived from α, ω-linear aliphatic dicarboxylic acid having 4 to 20 carbon atoms In part, an absorbent resin member made of a laser-absorbing polyamide resin composition, containing a fat, a copper salt, at least one of an alkali metal halide and an alkaline earth metal halide, and a light-absorbing dye A bonded product, the total amount a of a copper salt, an alkali metal halide and an alkaline earth metal halide contained in the laser transmissive polyamide resin composition, and the laser absorptivity The mass ratio of the total amount b of copper salt, alkali metal halide, and alkaline earth metal halide contained in the polyamide resin composition, a: b is 0.8: 1.2-1 .2: Molded product with 0.8.
<2> The molded article according to <1>, wherein the laser-transmitting polyamide resin composition and the laser-absorbing polyamide resin composition each contain glass fibers in a proportion of 20 to 40% by mass.
<3> The molding according to <1> or <2>, wherein the xylylenediamine contains paraxylylenediamine, and the α, ω-linear aliphatic dicarboxylic acid having 4 to 20 carbon atoms contains sebacic acid. Goods.
<4> The molded article according to any one of <1> to <3>, wherein the light absorbing dye contains carbon black.
<5> The molded article according to any one of <1> to <4>, wherein the laser-transmitting polyamide resin composition and the laser-absorbing polyamide resin composition each contain talc.
<6> Consists of diamine-derived structural units and dicarboxylic acid-derived structural units, 70 mol% or more of diamine-derived structural units are derived from xylylenediamine, and 70 mol% or more of dicarboxylic acid-derived structural units are carbon A polyamide resin derived from an α, ω-linear aliphatic dicarboxylic acid of 4 to 20, a copper salt, an alkali metal halide and an alkaline earth metal halide, and a light-transmitting dye Containing a laser-transmissible polyamide resin composition, a structural unit derived from a diamine and a structural unit derived from a dicarboxylic acid, 70 mol% or more of the structural unit derived from a diamine is derived from xylylenediamine, and a configuration derived from a dicarboxylic acid A polyamide resin in which 70 mol% or more of the unit is derived from an α, ω-linear aliphatic dicarboxylic acid having 4 to 20 carbon atoms, a copper salt, A laser-absorbing polyamide resin composition comprising at least one of a halide of a remetal and a halide of an alkaline earth metal and a light-absorbing dye, the laser-transmitting polyamide resin composition A total amount a of a copper salt, an alkali metal halide and an alkaline earth metal halide, and a copper salt and an alkali metal halide contained in the laser-absorbing polyamide resin composition. A kit in which a: b is 0.8: 1.2 to 1.2: 0.8, which is a mass ratio of a total amount b of halides of alkaline earth metals.
<7> The kit according to <6>, wherein the laser-transmitting polyamide resin composition and the laser-absorbing polyamide resin composition each contain glass fibers in a proportion of 20 to 40% by mass.
<8> The kit according to <6> or <7>, wherein the xylylenediamine contains paraxylylenediamine, and the α, ω-linear aliphatic dicarboxylic acid having 4 to 20 carbon atoms contains sebacic acid. .
<9> The kit according to any one of <6> to <8>, wherein the light absorbing dye contains carbon black.
<10> The kit according to any one of <6> to <9>, wherein the laser-transmitting polyamide resin composition and the laser-absorbing polyamide resin composition each contain talc.
<11><6>-<10> The manufacturing method of a molded article including carrying out laser welding using the kit as described in any one.

  According to the present invention, even if the molded product is placed under wet heat conditions, the molded product is excellent in laser weldability without causing color transfer derived from the stabilizer at the interface between the transparent resin member and the absorbent resin member, and It is possible to provide a kit for manufacturing the molded product and a manufacturing method for manufacturing the molded product. Furthermore, it was surprisingly found that the molded article of the present invention can maintain high strength even after the wet heat test.

FIG. 1 is a schematic view showing the laser weldability measuring method used in this example.

  Hereinafter, the contents of the present invention will be described in detail. In the present specification, “to” is used to mean that the numerical values described before and after it are included as a lower limit value and an upper limit value.

The molded article of the present invention is composed of a structural unit derived from diamine and a structural unit derived from dicarboxylic acid, and 70 mol% or more of the structural unit derived from diamine is derived from xylylenediamine, and 70 moles of the structural unit derived from dicarboxylic acid. % Or more of a polyamide resin derived from an α, ω-linear aliphatic dicarboxylic acid having 4 to 20 carbon atoms, a copper salt, an alkali metal halide and an alkaline earth metal halide, and light transmission Comprising a transparent resin member comprising a laser-transmissible polyamide resin composition, a structural unit derived from diamine and a structural unit derived from dicarboxylic acid, and 70 mol% or more of the structural unit derived from diamine is xylylenediamine 70 mol% or more of the structural unit derived from dicarboxylic acid is derived from α, ω-linear aliphatic dicarboxylic acid having 4 to 20 carbon atoms. Part of an absorbent resin member made of a laser-absorbing polyamide resin composition, comprising a polyamide resin, a copper salt, at least one of an alkali metal halide and an alkaline earth metal halide, and a light-absorbing dye A total amount a of a copper salt, an alkali metal halide, and an alkaline earth metal halide contained in the laser transmitting polyamide resin composition, and the laser absorption A: b is a mass ratio of the total amount b of the copper salt, the alkali metal halide, and the alkaline earth metal halide contained in the conductive polyamide resin composition. 1.2: 0.8.
Thus, a specific polyamide resin is used as the resin component for both the permeable resin member and the absorbent resin member, and an inorganic stabilizer is used as the stabilizer, and the ratio of the inorganic stabilizer is further changed to the permeable resin. By suppressing the color transfer at the interface between the transparent resin member and the absorbent resin member of the molded product after being placed under wet heat conditions while maintaining a high laser welding strength by making the amount almost the same between the member and the absorbent resin member It is a success. In particular, the use of a specific polyamide resin as the resin component has succeeded in maintaining high strength even after the wet heat test.

<Transparent resin member>
The transparent resin member in the present invention is formed from a laser transmissive polyamide resin composition. The laser transmissive polyamide resin composition contains a polyamide resin, a copper salt and a halide, and may further contain glass fiber, talc, a release agent and the like. Hereinafter, these components will be described in detail.

<< Polyamide resin >>
The laser-transmitting polyamide resin composition in the present invention is composed of a structural unit derived from a diamine and a structural unit derived from a dicarboxylic acid, and 70 mol% or more of the structural unit derived from a diamine is derived from xylylenediamine, and derived from a dicarboxylic acid. 70 mol% or more of the structural unit includes a polyamide resin derived from an α, ω-linear aliphatic dicarboxylic acid having 4 to 20 carbon atoms (hereinafter sometimes referred to as “specific polyamide resin”).
Here, being composed of a structural unit derived from a dicarboxylic acid and a structural unit derived from a diamine means that the amide bond constituting the specific polyamide resin is formed by the bond of the dicarboxylic acid and the diamine. Therefore, the specific polyamide resin may include other units such as a structural unit derived from a dicarboxylic acid, a structural unit other than a structural unit derived from a diamine, and a terminal group. In addition, trace amounts of additives and impurities may be included. It is preferable that 95 mass% or more of the polyamide resin used in the present invention is a structural unit derived from dicarboxylic acid or a structural unit derived from diamine.

In the specific polyamide resin, 70 mol% or more of the structural unit derived from diamine is derived from xylylenediamine, preferably 80 mol% or more, more preferably 90 mol% or more, more preferably 95 mol% or more to xylylenediamine. Derived from.
The xylylenediamine may be metaxylylenediamine, paraxylylenediamine, or a mixture of both, but preferably contains at least paraxylylenediamine.
Furthermore, in specific polyamide resin, it is preferable that 30-100 mol% of the structural unit derived from diamine originates in paraxylylenediamine. It is preferable that 0-70 mol% of the structural units derived from the remaining diamine components are derived from metaxylylenediamine.

The diamine other than xylylenediamine may be an aromatic diamine or an aliphatic diamine.
Linear or branched aliphatic diamines include tetramethylene diamine, pentamethylene diamine, 2-methylpentane diamine, hexamethylene diamine, heptamethylene diamine, octamethylene diamine, nonamethylene diamine, decamethylene diamine, dodecamethylene diamine, 2, Examples include 2,4-trimethyl-hexamethylenediamine and 2,4,4-trimethylhexamethylenediamine.
Examples of the alicyclic diamine include 1,3-bis (aminomethyl) cyclohexane, 1,4-bis (aminomethyl) cyclohexane, 1,3-diaminocyclohexane, 1,4-diaminocyclohexane, bis (4-amino Cyclohexyl) methane, 2,2-bis (4-aminocyclohexyl) propane, bis (aminomethyl) decalin, bis (aminomethyl) tricyclodecane.
Examples of the aromatic diamine include bis (4-aminophenyl) ether, paraphenylenediamine, and bis (aminomethyl) naphthalene.
In the specific polyamide resin, the diamine may be one kind or two or more kinds.

In the specific polyamide resin, 70 mol% or more of the structural unit derived from the dicarboxylic acid is derived from the α, ω-linear aliphatic dicarboxylic acid having 4 to 20 carbon atoms, preferably 80 mol% or more, more preferably. 90 mol% or more, more preferably 95 mol% or more, is derived from an α, ω-linear aliphatic dicarboxylic acid having 4 to 20 carbon atoms. Examples of the α, ω-linear aliphatic dicarboxylic acid having 4 to 20 carbon atoms include succinic acid, glutaric acid, pimelic acid, suberic acid, azelaic acid, adipic acid, sebacic acid, undecanedioic acid, dodecanedioic acid, and eicodioic acid. Is more preferable, and sebacic acid is particularly preferable.
Examples of the dicarboxylic acid other than the α, ω-linear aliphatic dicarboxylic acid having 4 to 20 carbon atoms include terephthalic acid, isophthalic acid, 2-chloroterephthalic acid, suberic acid, 5-sodium sulfoisophthalic acid, hexahydroterephthalic acid, Hexahydroisophthalic acid is exemplified.
In the specific polyamide resin, the dicarboxylic acid may be only one kind or two or more kinds.

  Specific examples of the specific polyamide resin include polyamide resins described in JP-A No. 2014-145004 and those corresponding to the specific polyamide resin, such as metaxylylene adipamide (MXD6), meta / Para-mixed xylylene adipamide (polyamide MP6), meta / para-mixed xylylene sebasamide (polyamide MP10), paraxylylene sebasamide (polyamide PXD10), polymetaxylylene dodecamide and the like are preferable. In the present invention, these polyamide homopolymers or copolymers can be used alone or in the form of a mixture.

The glass transition point of the specific polyamide resin is preferably 40 to 180 ° C, and more preferably 60 to 130 ° C.
The number average molecular weight of the specific polyamide resin is preferably 5000 to 45000, and more preferably 10,000 to 25000.
The melting point of the specific polyamide resin is preferably 170 ° C. or higher, and more preferably 180 to 300 ° C.

  The terminal carboxyl group concentration of the specific polyamide resin is preferably 50 to 200 μeq / g, more preferably 60 to 150 μeq / g.

The amount of the specific polyamide resin in the laser transmissive polyamide resin composition is preferably 50% by mass or more, more preferably 58% by mass or more, and further preferably 60% by mass or more. The upper limit is not particularly defined, but can be, for example, 98% by mass or less.
Only 1 type may be sufficient as specific polyamide resin, and it may contain 2 or more types. When 2 or more types are included, the total amount is preferably within the above range.

<< Other resin components >>
The laser transmissive polyamide resin composition used in the present invention may contain a polyamide resin other than the specific polyamide resin and other resin components other than the polyamide resin.
As the polyamide resin other than the specific polyamide resin, various polyamide resins such as a lactam polycondensate and a polycondensate of ω-aminocarboxylic acid, a polyamide resin which is a polycondensate of diamine and dicarboxylic acid other than the specific polyamide resin, In addition, these copolymerized polyamide resins are exemplified.
Specifically, polyamide 6, polyamide 66, etc. are illustrated.

As the resin other than the polyamide resin, a thermoplastic resin such as a polyester resin such as polyethylene terephthalate or polybutylene terephthalate, a polycarbonate resin, or a polyacetal resin can be used.
The laser-transmitting polyamide resin composition used in the present invention may be configured so as not to contain substantially any resin component other than the polyamide resin, for example, 5% by mass or less of the total amount of the resin components contained in the polyamide resin composition, 1% by mass or less, and particularly 0.4% by mass or less.

<< Copper salt >>
The laser transmissive polyamide resin composition in the present invention contains a copper salt. The copper used in the copper salt may be either cuprous or cupric, and specific examples thereof include copper halides, copper chloride, copper bromide and copper iodide are preferred, and copper iodide is preferred. More preferred.
The copper salt is preferably contained in the range of 0.01 to 5% by mass of the laser transmissive polyamide resin composition, more preferably in the range of 0.01 to 3% by mass, and 0.01 to 2%. More preferably, it is contained in the range of mass%, and more preferably in the range of 0.03 to 1 mass%.
Only one type of copper salt may be used, or two or more types may be included. When 2 or more types are included, the total amount is preferably within the above range.

<< Halides >>
The laser transmissive polyamide resin composition in the present invention contains at least one of an alkali metal halide and an alkaline earth metal halide. In the present invention, alkali metal halides are preferred.
As an alkali metal, sodium and potassium are preferable, and potassium is more preferable.
As the alkaline earth metal, magnesium, calcium, strontium and barium are preferable, and magnesium and calcium are more preferable.
Examples of the halogen atom constituting the halide include a fluorine atom, a chlorine atom, a bromine atom and an iodine atom, a chlorine atom, a bromine atom and an iodine atom are preferable, a bromine atom and an iodine atom are more preferable, and an iodine atom is further preferable. .
As the halide used in the present invention, potassium chloride, sodium chloride, potassium bromide, potassium iodide, and sodium iodide are preferable, and potassium iodide is more preferable.
The halide is preferably contained in the range of 0.1 to 10% by mass of the laser transmissive polyamide resin composition, more preferably in the range of 0.1 to 5% by mass, and 0.1 to 3%. More preferably, it is contained in the range of mass%.
One kind of halide may be contained, or two or more kinds may be contained. When 2 or more types are included, the total amount is preferably within the above range.

  In the laser transmissive polyamide resin composition, the mass ratio of the copper salt to the halide (halide / copper salt) is preferably 1 to 10, more preferably 3 to 7, and more preferably 4 to 6. More preferably. By setting it as such a ratio, the effect of this invention is exhibited more effectively.

The total amount a of the copper salt, the alkali metal halide, and the alkaline earth metal halide contained in the laser transmissive polyamide resin composition is 0.1 to 5.0% by mass in the composition. Preferably, it is 0.2 to 3.5% by mass, and more preferably 0.3 to 3.0% by mass. By setting it as such a range, the effect of this invention is exhibited more effectively.
The laser-transmitting polyamide resin composition used in the present invention can also have a configuration that does not substantially contain an organic stabilizer. “Substantially free” means 5% by mass or less of the total amount a, preferably 3% by mass or less, more preferably 1% by mass or less, and 0.1% by mass or less. More preferably. By substantially not including the organic stabilizer, it is possible to suppress the organic stabilizer from eluting when attached or immersed in an organic solvent or the like. In particular, in the present invention, it is preferable that both the laser-transmitting polyamide resin composition and the laser-absorbing polyamide resin composition are substantially free of an organic stabilizer.
In the present invention, by using an inorganic stabilizer, resistance to a laser can be ensured.

<< light-transmitting dye >>
The laser transmissive polyamide resin composition contains a light transmissive dye.
The light-transmitting dye used in the present invention is not particularly defined as long as it is a black dye that transmits a laser used for laser welding.
Specific examples include nigrosine, naphthalocyanine, aniline black, phthalocyanine, porphyrin, perylene, perinone, quaterylene, azo dye, anthraquinone, squaric acid derivative, and immonium dye.
Examples of commercially available products include e-BIND LTW-8731H and e-BIND LTE-8701H, which are colorants manufactured by Orient Chemical Industries.
The content of the light-transmitting dye in the laser-transmitting polyamide resin composition is preferably 0.001% by mass or more, more preferably 0.006% by mass or more, and more preferably 0%. It may be 0.018% by mass or more, 0.024% by mass or more, 0.030% by mass or more, or 0.050% by mass or more. The upper limit value is preferably 5.0% by mass or less, more preferably 3.0% by mass or less, further preferably 1.0% by mass or less, 0.2% by mass or less, It may be 0.1% by mass or less and 0.06% by mass or less. One kind of light-transmitting dye may be contained, or two or more kinds thereof may be contained. When 2 or more types are included, the total amount is preferably within the above range.
Moreover, it is preferable that the said laser permeable polyamide resin composition does not contain carbon black substantially. “Substantially free” means, for example, 0.0001% by mass or less of the laser-transmitting polyamide resin composition.

<< Glass fiber >>
The laser transmissive polyamide resin composition preferably contains glass fibers.
A glass fiber consists of glass compositions, such as A glass, C glass, E glass, and S glass, and E glass (an alkali free glass) is especially preferable.

The glass fiber used in the laser transmissive polyamide resin composition may be a single fiber or a single fiber twisted together.
As for the form of the glass fiber, “glass roving” continuously wound up of single fibers or twisted ones, “chopped strand” trimmed to a length of 1 to 10 mm, and pulverized to a length of about 10 to 500 μm. Any of "Mildo fiber" etc. may be sufficient. Such glass fibers are commercially available from Asahi Fiber Glass Co., Ltd. under the trade names “Glasslon Chopped Strand” and “Glasslon Milled Fiber”, and are easily available. Glass fibers having different forms can be used in combination.

  In the present invention, glass fibers having an irregular cross-sectional shape are also preferable. This irregular cross-sectional shape means that the flatness indicated by the long diameter / short diameter ratio (D2 / D1) when the long diameter of the cross section perpendicular to the length direction of the fiber is D2 and the short diameter is D1, is, for example, 1. It is 5-10, and it is preferable that it is 2.5-10 among these, Furthermore, it is 2.5-8, especially 2.5-5. Regarding such flat glass, the description of paragraph numbers 0065 to 0072 of JP 2011-195820 A can be referred to, and the contents thereof are incorporated in the present specification.

  The glass fiber in the present invention may be glass beads or glass flakes. The glass beads are spherical ones having an outer diameter of 10 to 100 μm, and are commercially available, for example, from Potters Barotini under the trade name “EGB731” and are easily available. Further, the glass flake is a flake shape having a thickness of 1 to 20 μm and a length of one side of 0.05 to 1 mm, and is commercially available, for example, under the trade name “Fureka” from Nippon Sheet Glass Co., Ltd. Are readily available.

The glass fiber used in the present invention is particularly preferably a glass fiber having a weight average fiber diameter of 1 to 20 μm and a cut length of 1 to 10 mm. Here, when the cross section of the glass fiber is flat, the weight average fiber diameter is calculated as a weight average fiber diameter in a circle having the same area.
The glass fiber used in the present invention may be bundled with a sizing agent. In this case, the sizing agent is preferably a urethane sizing agent.

The laser transmissive polyamide resin composition preferably contains glass fibers in a proportion of 20 to 40% by mass, and preferably contains 25 to 35% by mass.
The laser-transmitting polyamide resin composition may contain only one type of glass fiber or two or more types. When 2 or more types are included, the total amount is preferably within the above range.

<< Talc >>
The laser transmissive polyamide resin composition may contain talc. In the present invention, crystallization can be promoted by blending talc.
The blending amount of talc in the laser transmissive polyamide resin composition is preferably 0.05 to 20% by mass, more preferably 0.1 to 10% by mass, based on the composition. More preferably, it is 15-5 mass%, and it is especially preferable that it is 0.2-1.0 mass%. Only one type of talc may be used, or two or more types may be used in combination. In the case of two or more types, the total amount is preferably within the above range.

<< Releasing agent >>
The laser transmissive polyamide resin composition may contain a release agent. Examples of the releasing agent include aliphatic carboxylic acids, salts of aliphatic carboxylic acids, esters of aliphatic carboxylic acids and alcohols, aliphatic hydrocarbon compounds having a number average molecular weight of 200 to 15,000, and polysiloxane silicone oil. Etc.

Examples of the aliphatic carboxylic acid include saturated or unsaturated aliphatic monovalent, divalent or trivalent carboxylic acid. Here, the aliphatic carboxylic acid includes alicyclic carboxylic acid. Among these, preferable aliphatic carboxylic acids are monovalent or divalent carboxylic acids having 6 to 36 carbon atoms, and aliphatic saturated monovalent carboxylic acids having 6 to 36 carbon atoms are more preferable. Specific examples of such aliphatic carboxylic acids include palmitic acid, stearic acid, caproic acid, capric acid, lauric acid, arachidic acid, behenic acid, lignoceric acid, serotic acid, mellicic acid, tetratriacontanoic acid, montanic acid, adipine Examples include acids and azelaic acid.
Examples of the salt of the aliphatic carboxylic acid include sodium salt, potassium salt, calcium salt, and magnesium salt of the above aliphatic carboxylic acid.

  As aliphatic carboxylic acid in ester of aliphatic carboxylic acid and alcohol, the same thing as the said aliphatic carboxylic acid can be used, for example. On the other hand, examples of the alcohol include saturated or unsaturated monohydric or polyhydric alcohols. These alcohols may have a substituent such as a fluorine atom or an aryl group. Among these, monohydric or polyvalent saturated alcohols having 30 or less carbon atoms are preferable, and aliphatic or alicyclic saturated monohydric alcohols or aliphatic saturated polyhydric alcohols having 30 or less carbon atoms are more preferable.

  Specific examples of such alcohols include octanol, decanol, dodecanol, stearyl alcohol, behenyl alcohol, ethylene glycol, diethylene glycol, glycerin, pentaerythritol, trimethylolpropane, neopentylene glycol, ditrimethylolpropane, dipentaerythritol and the like.

  Specific examples of esters of aliphatic carboxylic acids and alcohols include beeswax (a mixture based on myricyl palmitate), stearyl stearate, behenyl behenate, stearyl behenate, glycerin monopalmitate, glycerin monostearate Examples thereof include rate, glycerol distearate, glycerol tristearate, pentaerythritol monopalmitate, pentaerythritol monostearate, pentaerythritol distearate, pentaerythritol tristearate, pentaerythritol tetrastearate and the like.

Examples of the aliphatic hydrocarbon having a number average molecular weight of 200 to 15,000 include liquid paraffin, paraffin wax, microwax, polyethylene wax, Fischer-Tropsch wax, and α-olefin oligomer having 3 to 12 carbon atoms. Here, the aliphatic hydrocarbon includes alicyclic hydrocarbons. The number average molecular weight of the aliphatic hydrocarbon is preferably 5,000 or less.
Among these, paraffin wax, polyethylene wax, or a partial oxide of polyethylene wax is preferable, and paraffin wax and polyethylene wax are more preferable.

  When the laser transmissive polyamide resin composition contains a release agent, the content of the release agent is preferably 0.001 to 2% by mass, and 0.01 to 1% by mass with respect to the polyamide resin composition. % Is more preferable. Only one type of release agent may be used, or two or more types may be included. When 2 or more types are included, the total amount is preferably within the above range.

<< other ingredients >>
The laser transmissive polyamide resin composition may contain other components without departing from the spirit of the present invention. Such other components include fillers other than glass fibers, flame retardants, UV absorbers, fluorescent brighteners, anti-dripping agents, antistatic agents, antifogging agents, lubricants, antiblocking agents, fluidity improvers, A plasticizer, a dispersing agent, an antibacterial agent, etc. are mentioned. These components may use only 1 type and may use 2 or more types together.

<< Method for Producing Laser-Transmissible Polyamide Resin Composition >>
The manufacturing method of the said laser permeable polyamide resin composition is not specifically defined, The manufacturing method of a well-known thermoplastic resin composition can be employ | adopted widely. Specifically, each component is mixed in advance using various mixers such as a tumbler and a Henschel mixer, and then melt kneaded with a Banbury mixer, roll, Brabender, single screw extruder, twin screw extruder, kneader, etc. A laser transmissive polyamide resin composition can be produced.

Further, for example, each component is not mixed in advance, or only a part of the components is mixed in advance, and supplied to an extruder using a feeder, and melt-kneaded to produce a laser transmissive polyamide resin composition. You can also
Furthermore, for example, a resin composition obtained by mixing some components in advance, supplying them to an extruder and melt-kneading is used as a master batch, and this master batch is mixed with the remaining components again and melt-kneaded. A laser transmissive polyamide resin composition can also be produced.

<Absorbent resin member>
The absorbing resin member in the present invention is formed from a laser-absorbing polyamide resin composition. The laser-absorbing polyamide resin composition includes a polyamide resin, a copper salt, a halide, and a light-absorbing dye, and may further include glass fiber, talc, a release agent, and the like.

<< Polyamide resin >>
The polyamide resin contained in the laser-absorbing polyamide resin composition in the present invention is synonymous with the polyamide resin contained in the laser-permeable polyamide resin composition, and the preferred range is also the same.

<< Copper salt >>
The laser-absorbing polyamide resin composition in the present invention contains a copper salt. The details of the copper salt are synonymous with the copper salt contained in the laser-transmitting polyamide resin composition, and the preferred range is also the same.

<< Halides >>
The laser-absorbing polyamide resin composition of the present invention contains at least one of an alkali metal halide and an alkaline earth metal halide. The details of the halide are synonymous with the halide contained in the laser-transmitting polyamide resin composition, and the preferred range is also the same.

The total amount b of the copper salt, the alkali metal halide, and the alkaline earth metal halide contained in the laser-absorbing polyamide resin composition is 0.1 to 5.0% by mass in the composition. Preferably, it is 0.2 to 3.5% by mass, and more preferably 0.3 to 3.0% by mass. By setting it as such a range, the effect of this invention is exhibited more effectively.
The laser-absorbing polyamide resin composition used in the present invention can also have a configuration that does not substantially contain an organic stabilizer. “Substantially free” means 5% by mass or less of the total amount b, preferably 3% by mass or less, more preferably 1% by mass or less, and 0.1% by mass or less. More preferably.

<< light absorbing dye >>
The laser-absorbing polyamide resin composition in the present invention contains a light-absorbing dye. The light absorbing dye preferably has a maximum absorption wavelength in the range of the laser light wavelength to be irradiated. Specifically, in the present invention, those having a maximum absorption wavelength in the wavelength range of 800 nm to 1100 nm (further, 800 to 1064 nm) are preferable, and inorganic pigments (carbon black (for example, acetylene black, lamp black, thermal black, Black pigments such as furnace black, channel black, ketjen black), red pigments such as iron oxide red, orange pigments such as molybdate orange, white pigments such as titanium oxide), organic pigments (yellow pigment, orange pigment, red) Pigments, blue pigments, green pigments, etc.). Among these, inorganic pigments are generally preferred because of their strong hiding power, and black pigments are more preferred. These light-absorbing dyes may be used in combination of two or more. The blending amount of the light-absorbing dye is preferably 1 to 10% by mass and more preferably 2 to 8% by mass with respect to the laser-absorbing polyamide resin composition.

<< Glass fiber >>
It is preferable that the said laser absorptive polyamide resin composition contains glass fiber. The details of the glass fiber are synonymous with the glass fiber contained in the laser-permeable polyamide resin composition, and the preferred range is also the same.

<< Talc >>
The laser-absorbing polyamide resin composition preferably contains talc. In the present invention, crystallization can be promoted by blending talc.
The blending amount of talc in the laser-absorbing polyamide resin composition is preferably 0.05 to 20% by mass, more preferably 0.1 to 10% by mass, based on the composition. More preferably, it is 8-5 mass%, and it is especially preferable that it is 1.0-3 mass%. Only one type of talc may be used, or two or more types may be used in combination. In the case of two or more types, the total amount is preferably within the above range.
In the present invention, the mass ratio between the amount of talc contained in the laser-transmitting polyamide resin composition and the amount of talc contained in the laser-absorbing polyamide resin composition (laser-absorbing polyamide resin composition / laser-transmitting polyamide resin composition). Product) is preferably 2-8, more preferably 3-7, and even more preferably 4-6. By adopting such a ratio, the absorber-side material has an increased temperature-falling crystallization temperature, that is, the solidification rate is increased, so that the risk of deformation during bonding can be reduced, and the transmission-side material has a laser beam transmittance. Stable welding is possible without lowering.

<< Releasing agent >>
It is preferable that the said laser absorptive polyamide resin composition contains a mold release agent. Details of the release agent are the same as those of the release agent contained in the laser-permeable polyamide resin composition, and the preferred range is also the same.

<< other ingredients >>
The laser-absorbing polyamide resin composition may contain other components without departing from the spirit of the present invention. The details of the other components are the same as those of the other components contained in the laser transmissive polyamide resin composition, and the preferred ranges are also the same.

<< Method for Producing Laser Absorbing Polyamide Resin Composition >>
The said laser absorptive polyamide resin composition can be manufactured by the method similar to the manufacturing method of the above-mentioned laser transmissible polyamide resin composition.

<Relationship between transparent resin member and absorbent resin member>
Next, the relationship between the permeable resin member and the absorbent resin member in the present invention will be described.
In the molded product of the present invention, the permeable resin member and the absorbent resin member are partially joined. Such bonding is achieved by laser light irradiation.
In the present invention, the polyamide resin contained in the permeable resin member and the polyamide resin contained in the absorbent resin member preferably have 80% by mass or more, and more preferably 90% by mass or more in common. By adopting such a configuration, the laser weldability tends to be improved.
In this invention, it is preferable that 80 mass% or more of the copper salt contained in the permeable resin member and the kind of copper salt contained in the absorbent resin member is common, and it is more preferable that 90 mass% or more is common. By adopting such a configuration, the color migration tends to be more effectively suppressed.
In the present invention, it is preferred that the halide contained in the permeable resin member and 80% by mass or more of the types of halogenation contained in the absorbent resin member are common, and more preferably 90% by mass or more are common. By adopting such a configuration, the color migration tends to be more effectively suppressed.

  In this invention, it is preferable that 70 mass% or more of the composition of a permeable resin member and an absorption resin member is common, and it is more preferable that 80 mass% or more is common. By adopting such a configuration, the laser weldability tends to be improved.

  In the present invention, the total amount a of the copper salt, the alkali metal halide, and the alkaline earth metal halide contained in the transmissive resin member (that is, the laser transmissive polyamide resin composition), the absorbing resin member ( That is, the mass ratio of the total amount b of the copper salt, alkali metal halide, and alkaline earth metal halide contained in the laser-absorbing polyamide resin composition), a: b is 0.8. : 1.2 to 1.2: 0.8, and preferably 0.9: 1.1 to 1.1: 0.9. By blending the stabilizer, it is possible to suppress deterioration of the material in the vicinity of the joint surface due to laser welding and achieve high welding strength. Furthermore, color transfer can also be effectively suppressed by making the mass ratio of a stabilizer into the said range.

Kit The kit of the present invention is composed of a structural unit derived from diamine and a structural unit derived from dicarboxylic acid, and 70 mol% or more of the structural unit derived from diamine is derived from xylylenediamine, and 70 moles of the structural unit derived from dicarboxylic acid. % Or more of a polyamide resin derived from an α, ω-linear aliphatic dicarboxylic acid having 4 to 20 carbon atoms, a copper salt, an alkali metal halide and an alkaline earth metal halide, and light transmission Comprising a laser-transmissible polyamide resin composition, a structural unit derived from diamine and a structural unit derived from dicarboxylic acid, and 70 mol% or more of the structural unit derived from diamine is derived from xylylenediamine, Polyamide tree in which 70 mol% or more of acid-derived structural units are derived from α, ω-linear aliphatic dicarboxylic acid having 4 to 20 carbon atoms A laser-absorbing polyamide resin composition comprising: a copper salt; at least one of an alkali metal halide and an alkaline earth metal halide; and a light-absorbing dye. Copper salt, alkali metal halide, total amount a of alkaline earth metal halide a contained in the transparent polyamide resin composition, copper salt contained in the laser-absorbing polyamide resin composition, A: b, which is a mass ratio of the total amount b of the alkali metal halide and the alkaline earth metal halide, is 0.8: 1.2 to 1.2: 0.8.
The details of the laser-transmitting polyamide resin composition and the details of the laser-absorbing polyamide resin composition are synonymous with the laser-transmitting polyamide resin composition and the laser-absorbing polyamide resin composition described in the above-mentioned molded article. The preferred range is also the same. Moreover, the preferable relationship between the laser-transmitting polyamide resin composition and the laser-absorbing polyamide resin composition is the same as the matters described in the relationship between the transmitting resin member and the absorbing resin member.

The kit of the present invention preferably has a welding strength of 5 kN or more, more preferably 10 kN or more when laser-welded according to the welding strength described in the examples described later. The upper limit value of the welding strength is not particularly defined, but can be, for example, 20 kN or less.
Furthermore, the kit of this invention can make 60% or more the intensity | strength retention after the wet heat test as described in the Example mentioned later.

Manufacturing method of molded product The manufacturing method of the molded product of the present invention includes laser welding using the kit of the present invention.
In the present invention, a molded product (transmitting resin member) formed by molding a laser-transmitting polyamide resin composition and a molded product (absorbing resin member) formed by molding the laser-absorbing polyamide resin composition are laser-welded. Molded articles can be manufactured. By laser welding, the transmissive resin member and the absorbing resin member can be firmly welded without using an adhesive or the like.
The shape of the member is not particularly limited, but is usually a shape having at least a surface contact portion (a flat surface or a curved surface) because the members are joined and used by laser welding. In laser welding, laser light that has passed through the transmissive resin member is absorbed by the absorbing resin member and melted, and both members are welded. In the present invention, even if the transparent resin member contains glass fibers, high laser welding strength can be achieved because of high transparency to laser light. Here, the thickness of the member through which the laser beam is transmitted (the thickness in the laser transmission direction at the portion through which the laser beam is transmitted) can be appropriately determined in consideration of the use, the composition of the laser-transmitting polyamide resin composition, and the like. For example, it is 5 mm or less, preferably 4 mm or less.

  The laser light source used for laser welding can be determined according to the type of light absorbed by the light-absorbing dye, and laser light having a maximum absorption wavelength in the wavelength range of 800 to 1064 nm is preferable. A specific example is a semiconductor laser.

More specifically, for example, when the permeable resin member and the absorbent resin member are welded, first, the welded portions are brought into contact with each other. At this time, surface contact is desirable between the welded portions of the two, and may be flat surfaces, curved surfaces, or a combination of flat and curved surfaces. Next, laser light is irradiated from the side of the transmissive resin member (preferably, the weld surface is irradiated from an angle of 85 to 95 °). At this time, the laser beam may be condensed at the interface between the two using a lens system if necessary. The condensed beam passes through the transmissive resin member, is absorbed near the surface of the absorbent resin member, generates heat, and melts. Next, the heat is transferred to the permeable resin member by heat conduction and melted to form a molten pool at the interface between the two, and after cooling, both are joined.
The molded product in which the permeable resin member and the absorbent resin member are welded in this way has high bonding strength.
In addition, the molded product in this invention is the meaning also including the member which comprises these parts other than a finished product and components.

The molded product obtained by laser welding according to the present invention has good mechanical strength, high welding strength, and little resin damage due to laser light irradiation, so that it can be used in various applications such as various storage containers, -It can be applied to electronic equipment parts, office automate (OA) equipment parts, home appliance parts, machine mechanism parts, vehicle mechanism parts, and the like. In particular, food containers, chemical containers, fat and oil product containers, hollow parts for vehicles (various tanks, intake manifold parts, camera housings, etc.), electrical parts for vehicles (various control units, ignition coil parts, etc.), motor parts, various types It can be suitably used for sensor parts, connector parts, switch parts, breaker parts, relay parts, coil parts, transformer parts, lamp parts, and the like.
In particular, the molded article and kit of the present invention are suitable for a housing of an in-vehicle camera.

  The present invention will be described more specifically with reference to the following examples. The materials, amounts used, ratios, processing details, processing procedures, and the like shown in the following examples can be changed as appropriate without departing from the spirit of the present invention. Therefore, the scope of the present invention is not limited to the specific examples shown below.

<Resin>
MP10: Obtained by the following synthesis method.
After heating and dissolving sebacic acid in a reactor under a nitrogen atmosphere, the molar ratio of paraxylylenediamine (Mitsubishi Gas Chemical) and metaxylylenediamine (Mitsubishi Gas Chemical) is While the 7: 3 mixed diamine was gradually added dropwise under pressure (0.35 MPa) so that the molar ratio of diamine to sebacic acid was about 1: 1, the temperature was raised to 235 ° C. After completion of the dropping, the reaction was continued for 60 minutes to adjust the amount of the component having a molecular weight of 1,000 or less. After completion of the reaction, the contents were taken out in a strand shape and pelletized with a pelletizer to obtain a polyamide resin.

<Glass fiber>
T-756H: manufactured by Nippon Electric Glass Co., Ltd., ECS03T-756H, weight average fiber diameter 10.5 μm, cut length 3 mm, surface-treated with urethane sizing agent <talc>
Micron White # 5000S: Hayashi Kasei Co., Ltd. <release agent>
Barium stearate: manufactured by Tokyo Chemical Industry Co., Ltd.

<Stabilizer>
Stabilizer 1: CuI, manufactured by Pure Chemical Co., copper iodide (I)
Stabilizer 2: KI, Nagase Sangyo Co., Ltd., 201FF STABILIZER
<Light transmissive dye>
LTW-8731H: manufactured by Orient Chemical Industry Co., Ltd., e-BIND LTW-8731H, polyamide 66 and light-transmitting dye masterbatch <light-absorbing dye>
Carbon black: carbon black masterbatch, manufactured by Nihongo Bix, PA-0896, acrylonitrile styrene resin (AS resin) and carbon black masterbatch (50% by mass of carbon black)

<Example 1>
<< Preparation of Laser-Transparent Polyamide Resin Composition Pellet >>
Resin, talc, mold release agent and stabilizer were weighed and dry blended so as to have the composition shown in Table 1 below (Table 1 is part by mass), and then twin screw extruder (Toshiba Machine Co., Ltd.) Made from a screw base of TEM26SS), using a twin screw cassette weighing feeder (CE-W-1-MP, manufactured by Kubota Corporation), and also for a light-transmitting dye, a twin screw cassette weighing Using a feeder (manufactured by Kubota Corporation, CE-W-1-MP), the screw root is simultaneously introduced, and for glass fiber, a vibrating cassette weighing feeder (manufactured by Kubota Corporation, CE-V-1B-MP) is used. From the side of the extruder, it was put into the above-mentioned twin-screw extruder, melted and kneaded with resin components and the like, and laser-permeable polyamide resin composition pellets were put in. The temperature setting of the extruder was 280 ° C.

<< Preparation of laser-absorbing polyamide resin composition pellets >>
Resin, talc, mold release agent and stabilizer were weighed and dry blended so as to have the composition shown in Table 1 below (Table 1 is part by mass), and then twin screw extruder (Toshiba Machine Co., Ltd.) Made from TEM26SS) using a twin screw cassette weighing feeder (KU-BOTA, CE-W-1-MP), and LTW-8731H is also a twin screw cassette weighing feeder (KUBOTA) Made by CE-W-1-MP) and simultaneously charged from the screw root. Glass fiber is fed into the above-mentioned twin screw extruder from the side of the extruder using a vibrating cassette weighing feeder (manufactured by Kubota Corporation, CE-V-1B-MP), and melt kneaded with resin components and the like. Then, laser-absorbing polyamide resin composition pellets were charged. The temperature setting of the extruder was 280 ° C.

<< welding strength >>
The laser transmissive polyamide resin composition pellets obtained above were dried at 120 ° C. for 5 hours, and then an injection molding machine (“Model: SE50DU” manufactured by Sumitomo Heavy Industries, Ltd.) was used. A test piece 1 (transparent resin member) having a width of 20 mm, a length of 126 mm, and a thickness of 1.0 mm was produced under the condition of a mold surface temperature of 110 ° C.
Moreover, after drying the laser-absorbing polyamide resin composition pellets obtained above at 120 ° C. for 5 hours, the cylinder temperature was 280 ° C. using an injection molding machine (“Model: SE50DU” manufactured by Sumitomo Heavy Industries, Ltd.). A test piece 2 (absorbing resin member) having a width of 20 mm, a length of 126 mm, and a thickness of 1.0 mm was produced under the conditions of a mold surface temperature of 110 ° C.
As shown in FIG. 1, the test pieces were overlapped and irradiated with laser light. In FIG. 1, (a) shows a view of the test piece from the side, and (b) shows a view of the test piece from above. Reference numeral 1 denotes a test piece 1, 2 denotes a test piece 2, and 3 denotes a laser beam irradiation spot.
The test piece 1 and the test piece 2 were overlapped, and laser was irradiated from the test piece 1 side. As a laser welding apparatus, a “PARK LASER SYSTEM” manufactured by Scan Type Parker Corporation was used. The laser beam wavelength was 940 nm (semiconductor laser), the welding spot diameter was 2.0 mm, and the welding length was 20 mm, and the laser was irradiated. The scanning speed of the laser beam was 5 mm / second, the laser output was 13 W, and the clamp pressure was 0.5 MPa. A test piece welded in this way was obtained.

Using the welded test piece obtained, laser welding strength was measured. The welding strength is measured according to the tensile test in ASTM D756 standard, using a tensile tester (Instron “5544 type”) and welding and integrating the test piece 1 and the test piece 2 with their long axes. Both ends in the direction were clamped and pulled at a pulling speed of 5 mm / min. Evaluation was made as follows according to the tensile shear fracture strength of the welded portion.
A1: The tensile shear fracture strength was 10 kN or more.
B1: The tensile shear fracture strength was 5 kN or more and less than 10 kN.
C1: The tensile shear fracture strength was less than 5 kN.

<< color transfer >>
According to the evaluation method of the welding strength, the test piece 1 and the test piece 2 were laser-welded to obtain a welded test piece. The obtained welded test piece was subjected to a wet heat treatment in an atmosphere of 85 ° C. and a relative humidity (RH) of 85% for 1000 hours. Then, the presence or absence of the color transfer of the welded test piece was confirmed visually.
A2: No color transfer occurred after the wet heat test.
C2: Color transfer was confirmed after the wet heat test.

<< Strength retention after wet heat test >>
According to the evaluation method of the welding strength, the test piece 1 and the test piece 2 were laser-welded to obtain a welded test piece. The obtained welded test piece was subjected to a wet heat treatment in an atmosphere of 85 ° C. and a relative humidity (RH) of 85% for 1000 hours. About the test piece welded after the wet heat treatment, the tensile shear fracture strength of the welded portion was determined in accordance with the tensile test in the ASTM D756 standard in the same manner as the evaluation method of the weld strength. The tensile retention before and after the wet heat treatment was evaluated as follows.
A3: The strength retention was 60% or more.
B3: Strength retention was less than 60%.

<Example 2, Comparative Examples 2-4>
In Example 1, it changed as shown in Table 1, and performed others similarly.

As is clear from the results in Table 1 above, when the mass ratio of the stabilizer in the laser-permeable polyamide resin composition and the laser-absorbing polyamide resin composition is within the range of the present invention, the welding strength is high and stable after the wet heat test. The color transfer derived from the agent was generated, and the strength retention after the wet heat test could be kept high.
On the other hand, when no stabilizer is added to the laser-transmitting polyamide resin composition (Comparative Example 1) or when no stabilizer is added to the laser-absorbing polyamide resin composition (Comparative Example 2), no resin is added to the stabilizer. The material of the member was brittle and the laser welding strength was insufficient. Moreover, the color transfer derived from a stabilizer was confirmed after the wet heat test. Furthermore, it turned out that the resin member to which the stabilizer after the wet heat test is not added is brittle and the strength is not sufficiently maintained.
Moreover, when a stabilizer is not blended in both the laser-transmitting polyamide resin composition and the laser-absorbing polyamide resin composition (Comparative Example 3), there is no color transfer derived from the stabilizer even after the wet heat test. A high strength retention rate was maintained after the test. However, the laser welding strength was insufficient.
When the ratio of the stabilizer contained in the laser-permeable polyamide resin composition to the stabilizer contained in the laser-absorbing polyamide resin composition is outside the scope of the present invention (Comparative Example 4), after laser welding strength and wet heat test Although the strength retention was excellent, the color transfer derived from the stabilizer occurred after the wet heat test.

1 Test piece 1
2 Test piece 2
3 Laser beam irradiation points

Claims (11)

It is composed of a structural unit derived from diamine and a structural unit derived from dicarboxylic acid, 70 mol% or more of the structural unit derived from diamine is derived from xylylenediamine, and 70 mol% or more of the structural unit derived from dicarboxylic acid has 4 to 4 carbon atoms. A polyamide resin derived from 20 α, ω-linear aliphatic dicarboxylic acids;
Copper salt,
At least one of an alkali metal halide and an alkaline earth metal halide;
A transmissive resin member comprising a laser transmissive polyamide resin composition, comprising a light transmissive dye;
It is composed of a structural unit derived from diamine and a structural unit derived from dicarboxylic acid, 70 mol% or more of the structural unit derived from diamine is derived from xylylenediamine, and 70 mol% or more of the structural unit derived from dicarboxylic acid has 4 to 4 carbon atoms. A polyamide resin derived from 20 α, ω-linear aliphatic dicarboxylic acids;
Copper salt,
At least one of an alkali metal halide and an alkaline earth metal halide;
A molded article in which a light-absorbing dye and an absorbent resin member made of a laser-absorbing polyamide resin composition are joined in part,
A total amount a of a copper salt, an alkali metal halide, and an alkaline earth metal halide contained in the laser transmissive polyamide resin composition;
The mass ratio of the total amount b of copper salt, alkali metal halide, and alkaline earth metal halide contained in the laser-absorbing polyamide resin composition, a: b is 0.8: 1. .2-1.2: 0.8 molded product. 2. The molded article according to claim 1, wherein each of the laser-transmissible polyamide resin composition and the laser-absorbing polyamide resin composition contains 20 to 40% by mass of glass fiber. The molded article according to claim 1 or 2, wherein the xylylenediamine contains paraxylylenediamine, and the α, ω-linear aliphatic dicarboxylic acid having 4 to 20 carbon atoms contains sebacic acid. The molded article according to any one of claims 1 to 3, wherein the light-absorbing dye contains carbon black. The molded article according to any one of claims 1 to 4, wherein the laser-permeable polyamide resin composition and the laser-absorbing polyamide resin composition each contain talc. It is composed of a structural unit derived from diamine and a structural unit derived from dicarboxylic acid, 70 mol% or more of the structural unit derived from diamine is derived from xylylenediamine, and 70 mol% or more of the structural unit derived from dicarboxylic acid has 4 to 4 carbon atoms. A polyamide resin derived from 20 α, ω-linear aliphatic dicarboxylic acids;
Copper salt,
At least one of an alkali metal halide and an alkaline earth metal halide;
A laser transmissive polyamide resin composition comprising a light transmissive dye;
It is composed of a structural unit derived from diamine and a structural unit derived from dicarboxylic acid, 70 mol% or more of the structural unit derived from diamine is derived from xylylenediamine, and 70 mol% or more of the structural unit derived from dicarboxylic acid has 4 to 4 carbon atoms. A polyamide resin derived from 20 α, ω-linear aliphatic dicarboxylic acids;
Copper salt,
At least one of an alkali metal halide and an alkaline earth metal halide;
A laser-absorbing polyamide resin composition comprising a light-absorbing dye;
A kit comprising:
A total amount a of a copper salt, an alkali metal halide, and an alkaline earth metal halide contained in the laser transmissive polyamide resin composition;
The mass ratio of the total amount b of copper salt, alkali metal halide, and alkaline earth metal halide contained in the laser-absorbing polyamide resin composition, a: b is 0.8: 1. 2 to 1.2: 0.8 kit. The kit according to claim 6, wherein each of the laser-permeable polyamide resin composition and the laser-absorbing polyamide resin composition contains 20 to 40% by mass of glass fiber. The kit according to claim 6 or 7, wherein the xylylenediamine contains paraxylylenediamine, and the α, ω-linear aliphatic dicarboxylic acid having 4 to 20 carbon atoms contains sebacic acid. The kit according to any one of claims 6 to 8, wherein the light-absorbing dye contains carbon black. The kit according to any one of claims 6 to 9, wherein the laser-permeable polyamide resin composition and the laser-absorbing polyamide resin composition each contain talc. The manufacturing method of a molded article including carrying out laser welding using the kit of any one of Claims 6-10.