JP2019104241A - Laser-welded body - Google Patents

Abstract

To provide a laser-welded body that exhibits high welding strength by, integrating thereof in a welding step, being excellent in welding strength of resin members with each other, maintaining characteristics of a resin contained in the resin members, and further improving melting property of the resin members even under laser welding conditions in which a sufficient scanning speed is substantially ensured without involving a complicated step even if different kinds of resin members or the same kind of resin members are used.SOLUTION: A laser welded body 10 contains a thermoplastic resin and nigrosine sulfate having a sulfate ion concentration of 0.3 to 5.0% by mass, and comprises a contact site where one or a plurality of resin members having an absorbance a of 0.09 to 0.9 overlapped and/or opposite one another, in which at least a part of the contact site is subjected to laser welding.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a laser-welded body in which resin members adjusted to a specific absorbance are integrated by laser welding.

  Instead of metal, lightweight thermoplastic resin products may be used for parts used in vehicles in the transportation field such as automobiles and railways and structural parts in the field of electronic and electrical equipment. Laser welding is known as a method of joining such thermoplastic resin members.

  Conventional laser welding is performed as shown in FIG. The laser light transmitting resin member 11 having laser light transmitting property is used for one member, and the laser light absorbing resin member 12 having laser light absorbing property is used for the other member. The site N is formed. When the laser light L is irradiated from there to the laser light absorbing resin member 12 from the side of the laser light transmitting resin member 11, the laser light L transmitted through the laser light transmitting resin member 11 is a laser light absorbing resin member Absorbed in 12, causing fever. The heat causes the laser light absorbing resin member 12 to melt around the portion where the laser light is absorbed, and further the heat conduction causes the laser light transmitting resin member 11 to melt and the two are fused. When this is cooled, the conventional laser welded body 13 in which the laser light transmitting resin member 11 and the laser light absorbing resin member 12 are welded at the contact portion N is manufactured.

  As a feature of laser welding, it is possible to weld a resin member only by locally irradiating a laser beam to a location to be joined, and because it is a local heat generation, the thermal effect on the peripheral portion other than the welding location There is no need to generate mechanical vibration, to be able to weld resin members with fine parts or three-dimensional complex structures, to be able to maintain high airtightness and to be highly reproducible. There are advantages such as high joint strength, inconspicuous boundaries of welded portions, and generation of no dust.

  According to the laser welding, the resin members can be surely welded and firmly joined. Furthermore, a joint strength equal to or higher than that obtained by methods such as fastening using fastening parts (bolts, screws, clips, etc.), adhesion using an adhesive, vibration welding, ultrasonic welding, etc. can be obtained. Moreover, since laser welding does not produce vibration and can minimize the influence of heat, it is possible to realize labor saving, improvement of productivity, reduction of manufacturing cost, and the like. Therefore, laser welding is suitable for joining functional parts and electronic parts that should avoid the influence of vibration and heat, for example, in the automobile industry and the electric / electronic industry etc., and can cope with the joining of resin parts with complicated shapes. .

  As a technique related to laser welding, after laminating the laser light transmitting resin member and the laser light absorbing resin member to which the carbon black that absorbs the laser light is added to Patent Document 1, the laser light transmitting resin member side The method of joining by welding both resin members by irradiating a laser beam is described. In this case, different types of resin members, ie, a laser ray transmitting resin member and a laser ray absorbing resin member, must be separately prepared.

  In Patent Document 2, a bonding flange portion formed in advance as a welding margin between a resin member that transmits laser light and a resin member that absorbs laser light is butted, and a bonding flange portion of a resin member that transmits laser light A laser welding method is described in which both resin members are temporarily welded by irradiating a laser beam from the side and then the welding flange portion is again subjected to main welding to be irradiated with the laser light to integrate both resin members. Also in this method, as in the laser welding method disclosed in Patent Document 1, plural types of resin members are essential.

  In Patent Document 3, a laser is brought into contact with thermoplastic resin members A and B and a heat dissipating material C having an infrared ray transmitting portion so as to have a positional relationship of C / A / B, and infrared light is irradiated from the heat dissipating material C side. The welding method is described. According to this method, the thermoplastic resin members A and B may be molded of the same type of thermoplastic resin. However, in this laser welding method, a special heat dissipating material C is essential to adjust the heat generation at the time of laser welding. Manufacturing the heat dissipating material C, which is not a member forming a part, only for laser welding complicates the process of laser welding.

Japanese Patent Publication No. 62-049850 JP 2004-351730 A International Publication 2003/039843

  The inventors of the present invention prepare a laser light transmitting and absorbing molded member containing a laser light absorber, particularly nigrosine, and adjusting its absorbance to a specific range in WO 2007/034970 and WO 2007/034978. Accordingly, it has been proposed to obtain a high-strength laser-welded body by simply laser-welding resin members of substantially the same quality. According to this, compared with the conventional laser welding which uses a laser ray transmitting resin member and a laser ray absorbing resin member as essential, generation of a burn and a void in a laser welding body is suppressed, and a wide range of irradiation conditions Laser welding can be performed, and a laser welded product can be obtained stably.

  According to the above invention, the melt spread (melt pool) can be increased as compared with the conventional laser welding, so that a laser welded body having higher tensile strength can be obtained. Further, the above invention has a feature that the spread of the molten pool becomes large and the welding strength of the laser welded body is increased by performing the laser welding under the laser light irradiation condition of a low energy amount and a low laser light scanning speed. doing. However, it is difficult to produce more laser welds in which resin members are welded with high strength by irradiating a laser beam with a high energy amount and a high scanning speed, per unit time.

  In production processes in industry, for example, production lines of factories for automobiles and home appliances, it is one of the important issues to improve production efficiency by improving production speed. For this reason, a laser welding method having high practicability such that a laser welded body having high welding strength can be manufactured even if the scanning speed is substantially improved and laser light is irradiated, and it can be introduced into a production line at low cost. The laser-welded body obtained by is desired from the industrial world.

  The present invention has been made to solve the above-mentioned problems, and it is possible to integrate in the laser welding step without passing through complicated steps, whether resin members of different types or resin members of the same type. Furthermore, it is an object of the present invention to provide a laser-welded body which is excellent in welding strength between resin members and which maintains the characteristics of the resin contained in the resin member.

  In addition to the above, the present invention further provides a laser-welded body that exhibits high welding strength even under laser welding conditions at a medium-high scanning speed by improving the meltability of the resin member. To aim.

  The inventor of the present invention uses one or more resin members having high thermal conductivity while adjusting to a specific absorbance so as to transmit a part while absorbing a part of laser light. As a result, the melting phenomenon of the resin member caused by irradiating the laser light is large and deep, and as a result, the melted portion spreads widely in a short time, so that the laser welding joined more quickly and more firmly than the conventional laser welding method I found that I could get a body.

  The laser weldment according to the present invention made to achieve the above object contains a thermoplastic resin and nigrosine sulfate having a concentration of 0.3 to 5.0% by mass of sulfate ion, and the absorbance a is 0. One or more resin members of 09 to 0.9 have contact portions formed by being superposed and / or butted, and at least a part of the contact portions is laser welded. is there.

  In the laser-welded body, the plurality of resin members are a first laser light transmitting and absorbing resin member which is a laser light irradiated resin member, and a second laser light transmitting and absorbing resin member of the same type or different from this. It may be.

  In the laser-welded body, for example, the plurality of resin members are a first laser beam transmitting and absorbing resin member and a second laser beam transmitting and absorbing resin member of the same type or different types from them. The thing is mentioned.

Laser-welded article, the absorbance a ₁ of the first laser-transmissible-absorptive resin member, the absorbance ratio a _{1 /} a ₂ between the absorbance a ₂ of the second laser-transmissible-absorptive resin member, 0.3 It may be 1.2.

  The laser-welded body is, for example, a laser-beam-irradiated material containing the one or more resin members and a thermoplastic resin of the same or different type as the thermoplastic resin and having an absorbance b of 0.01 to 0.09. One having a contact portion formed by overlapping and / or butting the laser light transmitting resin member which is a resin member, and at least a part of the contact portion being laser welded It can be mentioned.

In the laser-welded body, the plurality of resin members are a first laser beam transmitting and absorbing resin member and a second laser beam transmitting and absorbing resin member of the same or different type as that of the first laser beam transmitting and absorbing resin member absorbance ratio between the absorbance _{a 2} absorbance _{a 1} and the second laser-transmissible-absorptive resin member _a 1 / _{a 2} may be 0.3 to 1.2.

As the laser-welded body, for example, one having a volume resistivity of the nigrosine sulfate of 5.0 × 10 ⁹ Ω · cm to 7.0 × 10 ¹¹ Ω · cm can be mentioned.
It is preferable that the melt flow rate of the said resin member of a laser welding body is 11-30 g / 10min.

  In the laser welded body, the thermoplastic resin may be at least one selected from a polyamide resin, a polycarbonate resin, a polyphenylene sulfide resin, a polyethylene terephthalate resin, a polybutylene terephthalate resin, and a polypropylene resin.

In the laser welded body, the resin member may contain a colorant containing anthraquinone.
In the laser-deposited product, the anthraquinone is preferably an anthraquinone salt-forming dye.

In the laser-deposited product, the anthraquinone salt forming dye is A ^- B ⁺ (A ^- is an anion derived from anthraquinone and B ⁺ is a cation derived from organic ammonium) or AB (A is a residue of anthraquinone, And B is a residue of organic ammonium.

  Since the laser-welded body of the present invention is formed by laser-welding a plurality of or single laser light transmitting and absorbing resin members having both laser light transmitting property and laser light absorbing property, the laser light transmitting and absorbing resin members are distinguished from each other It is not necessary to do so, and the resin member can be easily prepared and managed. Since the laser-welded body has the laser light transmitting and absorbing resin member, the order and direction of superposition of the members are not limited, and the irradiation angle of the laser light can be selected in a wide range. Therefore, a laser weldment of complicated shape can be manufactured by a simple operation. Thus, the laser-welded body is manufactured by a simple process having high practicability which can be introduced at low cost.

  In the laser-welded body according to the present invention, the laser beam transmitting / absorbing resin member which is a resin member containing a thermoplastic resin and nigrosine sulfate has a sulfate ion concentration of 0.3 to 5.0% by mass as a laser beam absorbent. Since it contains the present nigrosine sulfate, it exhibits high meltability due to high fluidity and a decrease in crystal temperature, and the laser-welded body has a resin member containing the hydrochloride of nigrosine as a laser light absorber. Compared with what was used, it can manufacture with high production efficiency by the laser beam irradiation by medium-high scanning speed.

  The laser light transmitting and absorbing resin member of the laser-welded body rapidly generates heat and thermally melts upon receiving the laser light irradiation, so that an air gap is formed at the interface between the laser light transmitting and absorbing resin members which are superposed and / or butted. Even if are formed, the laser light transmitting and absorbing resin member exhibits the heat generation effect, and furthermore, the melt thereof is rich in fluidity, so that a deep and wide melt pool (total three-dimensional shape of the melt) is formed Because the air gap is closed, the laser-welded body exhibits high welding strength.

  Therefore, in the laser welding of the present invention, even if there is a defect on the surface such as sink marks or irregularities on the bonding surface of the molded resin member, welding failure hardly occurs and substantially sufficient welding strength is exhibited. A highly reliable and stable laser weldment is obtained. In particular, it can be suitably used for welding applications between members such as tanks, pipes, and containers where omission of contents such as containers should be avoided.

  In the laser-welded body, since the resin member contains nigrosine sulfate, the intrinsic properties of the thermoplastic resin contained in the resin member are not impaired as compared with carbon black, and the molten pool generated upon laser beam irradiation Because they grow large, in addition to developing high welding strength, the welding strength and the variation in appearance are small. Moreover, in this laser-welded body, when laser welding of the conventional laser light transmitting resin member and the laser light absorbing resin member is performed, there is no burnt or void in the melted portion caused by excessive energy. It is.

  Further, the laser-welded body of the laser light transmitting resin member disposed on the laser light irradiated side (outside) and the plurality of laser light transmitting and absorbing members has a high surface appearance and further contains a coloring agent. It is possible to select many kinds of hues and expand into colorful application fields.

  Furthermore, by containing a small amount of nigrosine sulfate in the laser light transmitting resin member, the heat generation effect can be expressed, the temperature difference between the members can be reduced, and the melt pool can be enlarged. It is possible to obtain a strong laser welded body with the absorbent member.

It is a perspective view showing an example in the middle of manufacturing a laser welding object to which the present invention is applied and a schematic partial cross-sectional view taken along the line AA of FIG. It is a schematic cross section which shows on the way which is manufacturing another laser welding body to which this invention is applied. It is a schematic cross section which shows on the way which is manufacturing another laser welding body to which this invention is applied. It is a schematic cross section which shows on the way which is manufacturing another laser welding body to which this invention is applied. It is a schematic cross section which shows on the way which is manufacturing another laser welding body to which this invention is applied. It is the perspective view which shows on the way which is manufacturing another laser welding body to which this invention is applied, and its partially expanded longitudinal cross-sectional view. It is a schematic cross section which shows on the way which is manufacturing another laser welding body to which this invention is applied. It is a schematic cross section which shows on the way which is manufacturing another laser welding body to which this invention is applied. It is a perspective view showing in the middle of manufacturing a laser welding object of Examples 7-1 and 7-2 to which the present invention is applied, and an enlarged fragmentary sectional view of it. It is a perspective view which shows in the middle of manufacturing the conventional laser welding object which does not apply this invention.

  Hereinafter, although the form for implementing this invention is demonstrated in detail, the scope of the present invention is not limited to these forms. In addition, in this specification, "-" is used in the meaning which includes the numerical value described before and after that as a lower limit and an upper limit.

  The perspective view which shows the middle in process of manufacturing the laser welding body of this invention is shown to Fig.1 (a), and the partial schematic cross section view in the AA arrow of it is shown to the same figure (b), respectively. The laser welding body 10 is one in which the resin members are integrated by joining a plurality of resin members by laser welding. The laser-welded member 10 is a resin member irradiated with laser light, and the first laser light transmitting and absorbing resin member 1 disposed on the upper side and the second laser light transmitting and absorbing resin member 2 disposed on the lower side are mutually formed. In order to form a level difference, they are shifted, superposed and in contact, and laser welding is performed on part of the superposed interface. The superposed interface is a contact portion between the surfaces of the both laser light transmitting and absorbing resin members 1 and 2. This contact site is a contact site N formed by the surfaces of the both laser light transmitting and absorbing resin members 1 and 2 contacting each other. At this time, both members may be fixed by pressure. The laser welded body 10 has a fused portion M which spreads to both the laser light transmitting and absorbing resin members 1 and 2 at the abutting portion N. The fusion bonding site M is a part where both of the laser light transmitting and absorbing resin members 1 and 2 melted by the incidence of the laser light L are cooled and solidified.

  Both laser light transmitting and absorbing resin members 1 and 2 are in the form of a flat rectangular plate having a uniform thickness. Both the laser light transmitting and absorbing resin members 1 and 2 contain a thermoplastic resin and nigrosine sulfate as a laser light absorbing agent. Thus, both the laser light transmitting and absorbing resin members 1 and 2 have a laser light transmitting and absorbing property of absorbing a part of the laser light and transmitting another part. The thermoplastic resins contained in both the laser ray transmitting and absorbing resin members 1 and 2 may be the same or different. In addition, the angle of laser beam irradiation, irradiation energy, and the frequency | count of irradiation can be suitably selected in view of the member of laser welding, a shape.

  The first laser light transmitting and absorbing resin member 1 which is a laser light irradiated resin member is disposed on the irradiation side of the laser light L. The laser light L is irradiated substantially perpendicularly to the irradiation surface of the first laser light transmitting and absorbing resin member 1. The laser beam L scans in a straight line in the X direction. Thus, in the laser welded body 10, both the laser light transmitting and absorbing resin members 1 and 2 are welded and integrated linearly at the contact portion N.

The absorbance a ₁ and the absorbance a ₂ of the two laser light transmitting and absorbing resin members ₁ and ₂ are, for example, 0.09 to 0.9 with respect to a laser beam having a wavelength range of 940 nm emitted from a semiconductor laser, 0 The ratio is preferably from 09 to 0.7, more preferably from 0.1 to 0.5, and still more preferably from 0.1 to 0.4. When the absorbance a ₁ and the absorbance a ₂ are in this range, both the laser light transmitting and absorbing resin members 1 and 2 have heat generation characteristics necessary for welding of both and excessive heat generation due to energy concentration of the incident laser light L It is compatible with deterrence. Further, a sufficient amount of heat is generated in both the first laser light transmitting and absorbing resin member 1 which is a resin member to be irradiated with laser light and the second laser light transmitting and absorbing resin member 2 which is not directly irradiated with the laser light L. Let them melt. Furthermore, even if the two laser light transmitting and absorbing resin members 1 and 2 have different thicknesses from each other, they are securely welded, so that the laser welded body 10 having a complicated shape can be manufactured. When the two laser light transmitting and absorbing resin members 1 and 2 are superimposed, the transmittance and absorbance of all of them are important. The transmittance of both of the laser light transmitting and absorbing resin members 1 and 2 is 7% or more, preferably 10 to 80%, and more preferably 15 to 70%.

The absorbance a ₁ and the absorbance a ₂ may have the same value or different values, such as a ₁ > a ₂ , a ₁ = a ₂ , or a ₁ <a ₂ .

The absorbance ratio a ₁ / a ₂ of the absorbance a ₁ to the absorbance a ₂ is preferably 0.3 to 1.2, more preferably 0.5 to 1.1, and 0.8 to 1 It is more preferable that .1. The thermoplastic resins contained in both of the laser light transmitting and absorbing resin members 1 and 2 are the same as each other, and the absorbance a ₁ and the absorbance a ₂ have the same value (a ₁ = a ₂ ), that is, the absorbance ratio a ₁ / Even more preferably, a ₂ = 1. According to it, since both laser light transmission and absorption resin members 1 and 2 have the same color tone, the interface and welding mark of both laser light transmission and absorption resin members 1 and 2 are not noticeable, and the designability of the laser welded body 10 is obtained. It can be improved. Further, since it is not necessary to separately prepare and manage the two laser light transmitting and absorbing resin members 1 and 2, the manufacturing process of the laser welded body 10 can be further simplified. Furthermore, since both the laser light transmitting and absorbing resin members 1 and 2 generate heat with the same degree of heat generation by the laser light irradiation, the temperature difference between them is small, and both laser light transmitting and absorbing resin members 1 and 2 A uniformly spread fusion site M is formed. As a result, as in the case of a conventional laser-welded body using a laser-absorptive resin member that absorbs the laser light excessively and a laser-transmissible resin member that does not generate heat sufficiently by the laser light irradiation to transmit the laser beam. Since a large difference is not generated in the amount of heat generation between resin members, the laser weldment 10 of the present invention is far higher than the conventional laser weldment even when using low energy laser light L. It has welding strength.

  The color tone of both the laser light transmitting and absorbing resin members 1 and 2 is preferably dark, and particularly preferably black. For example, it is preferable to add a coloring agent containing anthraquinone to the thermoplastic resin composition which is a raw material of both the laser beam transmission and absorption resin members 1 and 2.

When the absorbance a ₁ and the absorbance a ₂ exceeds the upper limit described above, since both the laser-transmissible-absorptive resin members 1 and 2 is excessively absorb laser light L, the energy concentration occurs in the incident position of the laser beam L. As a result, scratches, burns and voids occur in both of the laser light transmitting and absorbing resin members 1 and 2 to cause appearance defects in the laser welded body 10. On the other hand, if the absorbance a ₁ and the absorbance a ₂ is less than the above lower limit value, even insufficient calorific as was irradiated with laser light L to the first laser-transmissible-absorptive resin member 1 is a laser beam to be irradiated resin member There is no melting that is sufficient for welding of the two laser light transmitting and absorbing resin members 1 and 2. Therefore, the laser weldment 10 can not be obtained.

  Further, since both of the laser light transmitting and absorbing resin members 1 and 2 contain nigrosine sulfate, the crystallization is lower than that of a resin member containing no nigrosine and a resin member containing nigrosine hydrochloride. Have a temperature. As a result, both laser light transmitting and absorbing resin members 1 and 2 thermally fused upon receipt of the incident laser light L are rich in fluidity, so that the surfaces of both laser light transmitting and absorbing resin members 1 and 2 at the contact portion N, for example. Even if a void resulting from the roughness is formed, the two laser light transmitting and absorbing resin members 1 and 2 which have been thermally melted flow into this void and tightly block it, so that the laser-welded body 10 is firmly welded. Is formed. The sulfate ion concentration of nigrosine sulfate is 0.3 to 5.0% by mass, preferably 0.5 to 3.5% by mass. Nigrosine sulfate imparts high gloss to the surfaces of both the laser light transmitting and absorbing resin members 1 and 2. Thus, nigrosine sulfate acts as a crystallization temperature reducing agent, a flowability improver, and a surface gloss improver on a thermoplastic resin. The melt flow rate of both laser light transmitting and absorbing resin members 1 and 2 is in the range of 10 to 50 g / 10 min, more preferably 11 to 30 g / 10 min, and 12 to 20 g / 10 min. Is more preferred, and 13 to 18 g / 10 min is even more preferred.

  Such a laser welded body 10 is manufactured as follows. The manufacturing process includes, for example, the following steps A to D.

Step A: A first laser light transmission and absorption containing a thermoplastic resin and nigrosine sulfate having a concentration of 0.3 to 5.0% by mass of a sulfate ion, and optionally containing a colorant and an additive. Light transmitting and absorbing resin composition for forming a flexible resin member is prepared. The content of nigrosine sulfate, based on the absorbance the thermoplastic resin originally has, absorbance a ₁ is clamped to the range above from 0.09 to 0.9. Then, using a molding machine, for example, a rectangular plate-shaped first laser light transmitting and absorbing resin member 1 is molded.

  Step B: A laser ray transmitting / absorbing resin composition for molding a second laser ray transmitting / absorbing resin member is prepared in the same manner as in step A, and further prepared using, for example, a rectangular plate The second laser light transmitting and absorbing resin member 2 is molded.

  Step C: The two laser light transmitting and absorbing resin members 1 and 2 are overlapped and brought into contact with each other to form a contact portion N. At this time, both of the laser beam transmitting and absorbing resin members 1 and 2 may be held by a jig and pressed and fixed. Furthermore, a member having an anti-reflection function such as a glass plate or an anti-reflection film on the incident surface of the laser light L of the first laser light transmitting / absorbing resin member 1 which is a resin member irradiated with laser light, or shields the laser light. A transmissive member, such as a glass plate that does not damp or damp, may be disposed. The transmittance of both of the laser light transmitting and absorbing resin members 1 and 2 is 7% or more, preferably 10 to 80%, and more preferably 15 to 70%.

  Step D: The laser light L adjusted to the predetermined condition is passed from the first laser light transmitting and absorbing resin member 1 side to the second laser light transmitting and absorbing resin member 2 through the contact portion N and the X direction Irradiate while scanning. The laser light L first enters the first laser light transmitting and absorbing resin member 1. A part of the laser light L passes through the first laser light transmitting and absorbing resin member 1. Another part is absorbed by the first laser light transmitting and absorbing resin member 1 to generate heat. The first laser light transmitting and absorbing resin member 1 generates heat above the melting point of the thermoplastic resin contained in the portion where it has absorbed the laser light L, and first has a substantially cylindrical shape along the laser light L incident therein Melt in the liquid form. The laser light L transmitted through the first laser light transmitting and absorbing resin member 1 is incident on the second laser light transmitting and absorbing resin member 2 from the contact portion N and is absorbed. The second laser light transmitting and absorbing resin member 2 is first melted at the contact portion N, and the melting grows toward the non-incident surface of the laser light L in the second laser light transmitting and absorbing resin member 2. As a result, a molten pool is formed as if part of the two laser light transmitting and absorbing resin members 1 and 2 is filled with the molten liquid resin.

  Both the laser light transmitting and absorbing resin members 1 and 2 have a low crystallization temperature and high fluidity due to the inclusion of nigrosine sulfate having a sulfate ion concentration of 0.3 to 5.0% by mass. Therefore, when the laser light L is incident, the heat is rapidly melted to form a molten pool. Therefore, the scanning speed of the laser beam L can be substantially increased as compared with the conventional laser welding method.

  The heat of the molten pool radiates and conducts slightly in the direction perpendicular to the incident direction of the laser light L. The molten pool thereby grows. The molten pool spreads to both the laser light transmitting and absorbing resin members 1 and 2 through a part of the contact portion N. The molten pool is cooled, and the melted portions of both the laser light transmitting and absorbing resin members 1 and 2 solidify. As a result, at the contact portion N, a fused portion M is formed so as to extend over both the laser light transmitting and absorbing resin members 1 and 2. As a result, both the laser light transmitting and absorbing resin members 1 and 2 are firmly joined at the welded contact portion N, and the laser welded body 10 is completed.

  According to such a manufacturing method, the laser beam L is scanned at a medium high speed by a simple method of irradiating the resin member to be welded with the laser beam L, and the fusion region M spread over a wide area is formed. Thus, the laser welded body 10 can be manufactured. Therefore, the laser-welded body 10 having high welding strength can be manufactured with practically sufficient production efficiency.

  In the process D, a cooling process may be performed such as blowing air or an inert gas of warm or room temperature on the surface on the incident side of the laser light L. Moreover, when both laser light transmission and absorption resin members 1 and 2 produce gas at the time of laser welding, you may process this using a gas processing apparatus.

The laser-welded body 10 using the first laser beam transmitting and absorbing resin member 1 and the second laser beam transmitting and absorbing resin member 2 and only the first laser beam transmitting and absorbing resin member 1 with reference to FIGS. Another form of the laser-welded body 10 using the above will be described. Absorbance a ₁ and the absorbance a ₂ of the second laser-transmissible-absorptive resin member 2 of the first laser-transmissible-absorptive resin member 1 has a value of the same range as above.

  The schematic cross section in the middle of manufacturing another laser welding body 10 is shown in Drawing 2 (a). The laser welded body 10 has a butt portion B which is a contact portion where the end portions of both of the laser light transmitting and absorbing resin members 1 and 2 face each other while facing each other. The laser beam L is emitted from directly above the butt region B toward there. As a result, the two laser light transmitting and absorbing resin members 1 and 2 are welded and integrated at the butt portion B to form the laser welded body 10.

The schematic cross section in the middle of manufacturing another laser welding body 10 is shown in FIG.2 (b). The first laser light transmitting and absorbing resin member 1 which is a laser light irradiated resin member is divided into a first laser light transmitting and absorbing resin member piece 1a and a first laser light transmitting and absorbing resin member piece 1b. They are butted against each other. By overlapping the two laser light transmitting and absorbing resin members 1 and 2, it is possible to use the first laser light transmitting and absorbing resin member piece 1 a and the second laser light transmitting and absorbing resin member 2 as the contact portion N. a contact portion N _1a-2, a first laser-transmissible-absorptive resin piece 1b and the contact portion N _1b-2 of the second laser-transmissible-absorptive resin member 2 is formed. The end portions of the first laser beam transmitting and absorbing resin member pieces 1a and 1b are in contact with each other. As a result, a butt portion B perpendicular to the contact portions N _1a-2 and N _1b-2 is formed in the laser welded body 10. The first laser beam transmitting and absorbing resin member pieces 1a and 1b and the second laser beam transmitting and absorbing resin member 2 have the same outer dimensions. Therefore, the first laser light transmitting and absorbing resin member 1 protrudes at both ends of the second laser light transmitting and absorbing resin member 2. The absorbance a _1-1 of the first laser light transmitting and absorbing resin member piece 1a and the absorbance a _1-2 of the first laser light transmitting and absorbing resin member piece 1a are the absorbance of the first laser light transmitting and absorbing resin member 1 be in the range of 0.09 to 0.9 is a _1, be the same as each other or may be different. The laser beam L is emitted from directly above the butt region B toward it. As a result, the first laser light transmitting and absorbing resin member pieces 1a and 1b are welded at the butt portion B, and further, the two laser light transmitting and absorbing resin members 1 and 2 are welded at the contact portions N _1a-2 and N _1b-2 It is done. As a result, the laser-welded body 10 welded at the butt portion B and the contact portions N _1a-2 and N _1b-2 is formed.

The schematic cross section in the middle of manufacturing another laser welding body 10 is shown in FIG.2 (c). The first laser beam transmitting and absorbing resin member 1 which is a laser beam irradiated resin member is disposed on the upper side, and the second laser beam transmitting and absorbing resin member 2 is disposed on the lower side. The second laser light transmitting and absorbing resin member 2 is divided into a second laser light transmitting and absorbing resin member piece 2a and a second laser light transmitting and absorbing resin member piece 2b, and they are butted against each other. The two laser light transmitting and absorbing resin members 1 and 2 are overlapped, and the contact portion N _1-2a between the first laser light transmitting and absorbing resin member 1 and the second laser light transmitting and absorbing resin member piece 2a, and A contact portion N _1-2 b between the 1 laser light transmitting and absorbing resin member 1 and the second laser light transmitting and absorbing resin member piece 2 b is formed. The end portions of the second laser light transmitting and absorbing resin member pieces 2a and 2b are in contact with each other. As a result, a butt portion B perpendicular to the contact portions N _1-2a and N _1-2b is formed in the laser welded body 10. The first laser beam transmitting and absorbing resin member 1 and the second laser beam transmitting and absorbing resin member pieces 2a and 2b have the same outer dimensions. Therefore, the second laser light transmitting and absorbing resin member 2 protrudes at both ends of the first laser light transmitting and absorbing resin member 1. The absorbance a _2-1 of the second laser light transmitting / absorbing resin member piece 2a and the absorbance a _2-2 of the second laser light transmitting / absorbing resin member piece 2b are the absorbance of the second laser light transmitting / absorbing resin member 2 it is in the range of 0.09 to 0.9 which is a _2, be the same as each other or may be different. The laser light L is emitted from the first laser light transmitting and absorbing resin member 1 side toward the butt portion B. As a result of the first laser light transmitting and absorbing resin member 1 melting at the incident position of the laser light L and then the second laser light transmitting and absorbing resin member 2 melting at the butt portion B, the first laser light transmitting and absorbing resin member 1 and the second laser beam transmitting and absorbing resin member pieces 2a and 2b contact portions N _1-2a and N _1-2b , and the second laser beam transmitting and absorbing resin member pieces 2a and 2b at the abutting portion B, Each is welded. The fusion bonding site M of the laser welded body 10 is formed across the contact sites N _1-2a and N _1-2b and the butt site B. Thus, the laser-welded body 10 welded at the butt portion B and the abutting portion N is formed.

The schematic cross section in the middle of manufacturing the laser welding body 10 of 3 layer structure is shown in FIG. 3 (a). In the laser-welded body 10, a laser beam transmitting resin member 3 which is a laser beam irradiated resin member, a first laser beam transmitting and absorbing resin member 1, and a second laser beam transmitting and absorbing resin member 2 are in this order And laser welding. The first laser light transmitting and absorbing resin member 1 is sandwiched between the laser light transmitting resin member 3 and the second laser light transmitting and absorbing resin member 2. The laser welded body 10 includes an upper contact portion N ₁ which is a polymerization interface between the laser light transmitting resin member 3 and the first laser light transmitting and absorbing resin member 1, and the first laser light transmitting and absorbing resin member 1. a lower contact portion N ₂ is the polymerization was the interface between the second laser-transmissible-absorptive resin member 2 has. Fusion site M is formed over the upper contact portion N ₁ and the lower contact portion N ₂ Doo.

The laser ray transmitting resin member 3 is made of the same or different thermoplastic resin as the laser ray transmitting and absorbing resin members 1 and 2. The absorbance b of the laser light transmitting resin member 3 is preferably 0.01 to 0.09, more preferably 0.05 to 0.09, and preferably 0.07 to 0.09. More preferred. The absorbance b in such a range can be obtained by the absorbance originally possessed by the thermoplastic resin contained as a raw material of the laser ray transmitting resin member 3. On the other hand, when the absorbance of this thermoplastic resin is less than the above lower limit value, the raw material composition of the laser ray transmitting resin member 3 contains a very small amount of a laser light absorbing agent such as nigrosine sulfate, for example, 100 mass of thermoplastic resin The absorbance b in the above-mentioned range can be imparted to the laser beam transmitting resin member 3 by including the content of 0.0001 to 0.01 parts by mass with respect to the part. The sulfate ion concentration of this nigrosine sulfate is preferably 0.3 to 5.0% by mass. As described above, the laser beam transmitting resin member 3 has the same or lower absorbance than the first laser beam transmitting and absorbing resin member 1 and the second laser beam transmitting and absorbing resin member 2. When the absorbance b is in this range, the laser light transmitting resin member 3 transmits the laser light L, or transmits most of the laser light L and absorbs a part of it. Incidentally, the absorbance ratio _a 1 / _{a 2} between the absorbance _{a 1} and the absorbance _{a 2} is preferably 0.3 to 1.2.

The laser welding process in the laser welded body 10 will be described. When the laser light L is irradiated from the laser light transmitting resin member 3 side, the laser light transmitting resin member 3 has the absorbance b, so that the laser light L is transmitted or the laser light L is large. While penetrating the part, it absorbs a part of it slightly and generates heat. The laser beam L transmitted through the laser beam transmitting resin member 3 is absorbed by the first laser beam transmitting and absorbing resin member 1 and the first laser beam transmitting and absorbing resin member 1 generates heat. Whereby in the vicinity of the upper contact portion N _1, molten pool with laser ray transmitting resin member 3 and the first laser-transmissible-absorptive resin member 1 is melted it is formed. At this time, due to the absorbance a _{1 of} the first laser light transmitting and absorbing resin member 1 being larger than the absorbance b of the laser light transmitting resin member 3, the first laser light transmitting and absorbing resin member 1 is formed. The molten pool has a volume larger than that of the laser ray transmitting resin member 3.

Part of the laser light L transmitted through the first laser light transmitting and absorbing resin member 1 is absorbed by the second laser light transmitting and absorbing resin member 2 to cause heat generation and melting. As a result, penetrate the upper contact portion N ₁ from the first laser-transmissible-absorptive resin member 1, the molten pool extending up to the lower contact portion N ₂ second laser-transmissible-absorptive resin member 2 via is formed Ru. By the molten pool to solidify by cooling, fusion site M which over the upper contact portion N ₁ lower abutment portion N ₂ is formed, the laser ray transmitting resin member 3, the first laser beam The transmission and absorption resin member 1 and the second laser light transmission and absorption resin member 2 are integrated to obtain a laser welded body 10.

  When the laser ray transmitting resin member 3 contains a small amount of nigrosine sulfate within the range showing the absorbance b, the amount of heat generated by the incidence of the laser light L can be increased. Thereby, the calorific value difference (temperature difference) between the first laser light transmitting and absorbing resin member 1 and the laser light transmitting resin member 3 by the laser light L is reduced, and the spread of the molten pool to the laser light transmitting resin member 3 As a result, the welding strength between the laser beam transmitting resin member 3 and the first laser beam transmitting and absorbing resin member 1 can be further improved.

The schematic cross section in the middle of manufacturing another laser welding body 10 is shown in FIG.3 (b). The laser welded body 10 is welded at a butt portion and a plurality of abutting portions. The first laser light transmitting and absorbing resin member 1 and the second laser light transmitting and absorbing resin member 2 are butted at their end portions to form a butt portion B. A laser ray transmitting resin member 3 which is a laser ray irradiated resin member is superimposed on the first laser light transmitting / absorbing resin member 1 and the second laser light transmitting / absorbing resin member 2 so as to cover the butt portion B. There is. Thereby, the contact portion N _3-1 , which is the contact surface between the laser beam transmitting resin member 3 and the first laser beam transmitting and absorbing resin member 1, and the laser beam transmitting resin member 3 and the second laser beam transmitting and absorbing A contact portion N _3-2 which is a contact surface with the elastic resin member 2 is formed. The laser light L is irradiated from the laser light transmitting resin member 3 side toward the butt portion B. Each abutment portion N _1, N _2, and fusion site M which over portion B butt are formed, each abutment portion N _1, N ₂ and butt laser ray transmitting resin member 3 at a site B, first The laser light transmitting and absorbing resin member 1 and the second laser light transmitting and absorbing resin member 2 are welded and integrated to form a laser welded body 10.

The schematic cross section in the middle of manufacturing another laser welding body 10 is shown in FIG.3 (c). The laser welded body 10 is welded at a butt portion and a plurality of abutting portions. The first laser beam transmitting and absorbing resin member 1 is divided into a first laser beam transmitting and absorbing resin member piece 1a and a first laser beam transmitting and absorbing resin member piece 1b, and they are butted against each other. The end portions of the first laser beam transmitting and absorbing resin member pieces 1a and 1b are butted to contact with each other, and a butt portion B is formed. A laser ray transmitting resin member 3 which is a laser beam irradiated resin member is overlapped so as to cover the butted portion B. Furthermore, the second laser beam transmitting and absorbing resin member 2 is disposed so as to sandwich the first laser beam transmitting and absorbing resin member pieces 1a and 1b which are the first laser beam transmitting and absorbing resin member 1 together with the laser beam transmitting resin member 3 Is superimposed on the first laser light transmitting and absorbing resin member 1. Thereby, the contact portion N _3-1a which is a polymerized interface where the laser light transmitting resin member 3 and the first laser light transmitting and absorbing resin member piece 1a contact, the laser light transmitting resin member 3 and the first laser light The first laser light transmitting and absorbing resin member piece 1a and the second laser light transmitting and absorbing resin member 2 are in contact with each other at the contact portion N _3-1b which is the polymerization interface with which the light transmitting and absorbing resin member piece 1b is in contact. the superimposed contact portion N _1b is a polymerization was interface contact region N _1a-2, and the first laser-transmissible-absorptive resin piece 1b and the second laser-transmissible-absorptive resin member 2 are in contact is a surface _-2 is formed. The laser light L is irradiated from the laser light transmitting resin member 3 side toward the butt portion B. A fusion site M is formed on each abutting site N _3-1a , N _3-1b , N _1a-2 , N _1b-2 and butt area B, and each abutting site N _3-1a , N _3-1b , _{N1a -2} , _{N1b -2} and the laser light transmitting resin member 3 at the butt portion B, the first laser light transmitting and absorbing resin member pieces 1a and 1b, and the second laser light transmitting and absorbing resin member 2 weld and integrate, and the laser welding body 10 is formed.

In addition, the laser welded body 10 may have a four-layer structure in which both the laser light transmitting and absorbing resin members 1 and 2 overlapping each other are sandwiched by a plurality of laser light transmitting resin members 3. The laser-welded body 10 shown in FIG. 3D includes the upper laser beam transmitting resin member 3a which is a laser beam irradiated resin member, the first laser beam transmitting and absorbing resin member 1, and the second laser beam transmitting and absorbing property. The resin member 2 and the lower laser light transmitting resin member 3b are stacked in this order, and they are laser welded. The first laser beam transmitting and absorbing resin member 1 is divided into a first laser beam transmitting and absorbing resin member piece 1a and the first laser beam transmitting and absorbing resin member piece 1b, and the second laser beam transmitting and absorbing resin member 2 is formed into a second The laser beam transmitting / absorbing resin member 2a and the second laser beam transmitting / absorbing resin member piece 2b are respectively divided, and they are respectively butted. The first laser-transmissible-absorptive resin piece 1a, and contacts abut the ends 1b, the portion B ₁ upper butt are formed. The second laser-transmissible-absorptive resin piece 2a, and contacts abut the ends of 2b, and site B ₂ abutting the lower side is formed. Both butting parts B ₁ and B ₂ overlap in the vertical direction. Each of the resin members 1, 2, 3a, 3b is in the form of a rectangular plate having the same outer dimensions, so that the first laser light transmitting and absorbing resin member 1 and the second laser having the butted portions B ₁ and B ₂ The light transmitting and absorbing resin member 2 protrudes at the end faces of the two opposing sides of the two laser light transmitting resin members 3a and 3b.

Upper laser ray transmitting resin member 3a so as to cover the portion B ₁ upper butt is first laser-transmissible-absorptive resin piece 1a, to 1b, the lower laser-transmissible to overlap a portion B ₂ abutting the lower The resin member 3b is overlapped with the second laser beam transmitting and absorbing resin member pieces 2a and 2b. In addition, the first laser beam transmitting and absorbing resin member piece 1a and the second laser beam transmitting and absorbing resin member piece 2a are the first laser beam transmitting and absorbing resin member piece 1b and the second laser beam transmitting and absorbing resin member piece 2b overlaps with each other. Thereby, the laser welded body 10 is a contact portion N _3a-1a which is a polymerization interface between the upper laser light transmitting resin member 3a and the first laser light transmitting and absorbing resin member piece 1a, and the upper laser light transmitting resin Abutment site N _3a- 1 _b which is a polymerization interface between the member 3 a and the first laser beam transmitting and absorbing resin member piece 1 _b , the first laser beam transmitting and absorbing resin member piece 1 a and the second laser beam transmitting and absorbing resin member Contact point N _1a-2a which is a polymerization interface with the piece 2a, contact area which is a polymerization interface of the first laser beam transmitting / absorbing resin member piece 1b and the second laser beam transmitting / absorbing resin member 2b N _1b-2b , a contact portion N _2a-3b which is a polymerization interface between the second laser beam transmitting and absorbing resin member piece 2a and the lower laser beam transmitting resin member _3b , and a second laser beam transmitting and absorbing resin With piece 2b It has an abutting portion N 2 _{b-3 b} which is a polymerization interface with the lower laser light transmitting resin member 3 b.

Laser beam L is irradiated toward the upper laser ray transmitting resin member 3a side on both abutting parts B _1, B _2. As a result, a fusion site M is formed which covers both butting sites B ₁ and B ₂ and N _3a-1a , N _3a-1b , N _1a-2b , N _1b-2b , N _2a-3b and N _2b-3b The upper laser light transmitting resin member 3a, the first laser light transmitting and absorbing resin member 1, the second laser light transmitting and absorbing resin member 2, and the lower laser light transmitting resin member The laser-welded body 10 is formed by welding and integrating with 3 b.

  The resin member constituting the laser welded body 10 may be singular. The resin member may be formed into an arbitrary shape, so that the laser-welded body 10 may be in the form of a roll, a cylinder, a prism, or a box in which the laser welded body 10 is curved or bent. For example, the laser-welded article 10 shown in FIG. 4A includes only the first laser light transmitting and absorbing resin member 1 as a single resin member. The first laser light transmitting and absorbing resin member 1 is mountain-folded at four points so as to form a cylindrical shape having open ends, and the end portions thereof are butted to contact with each other, thereby the butt portion B Is formed. The laser welded body 10 is welded at the butt portion B by irradiating the butt portion B with the laser light L.

  As shown in FIG. 4 (b), the first laser light transmitting and absorbing resin member 1 is mountain-folded at four points so as to form a cylindrical shape having open ends, and a part of them is overlapped and in contact with each other. The laser welding body 10 may have a contact portion N formed by the above. The laser light L is along the X direction (see FIG. 1 (a) and FIG. 4 (c), the depth direction) on the surface of the first laser light transmitting and absorbing resin member 1 and in the Y direction orthogonal to this. It also scans (in FIG. 4C, left and right direction). As a result, the fusion bonding site M can be formed over a wide area of the first laser light transmitting and absorbing resin member, and a large welding area can be formed in the contact site N. As a result, since the first laser light transmitting and absorbing resin member 1 is welded with high strength at the contact portion N, the laser welded body 10 is a portion welded by laser even if it receives an external force such as bending or twisting. Hard to cause peeling.

  Further, as shown in FIG. 4C, a laser beam transmitting resin member which is a laser beam irradiated resin member so as to cover the butted portion B of the first laser beam transmitting and absorbing resin member 1 having a cylindrical shape. By overlapping 3, the laser welded body 10 may have a contact portion N where the first laser light transmitting and absorbing resin member 1 and the laser light transmitting resin member 3 are in contact with each other. The laser ray transmitting resin member 3 has the same absorbance b as that shown in FIG. By irradiating the laser beam L from the laser light transmitting resin member 3 toward the butt area B, the laser welded body 10 is laser welded at the butt area B and the abutting area N. According to this, since the laser welding is performed not only on the butt portion B but also on the abutting portion N, it is possible to form the laser welded body 10 in which the resin members are more firmly welded.

  The schematic cross section in the middle of manufacturing another laser welding body 10 is shown to FIG. 5 (a). The laser welded body 10 has a butted portion B formed by abutting the end of the first laser light transmitting and absorbing resin member 1 to one surface of the second laser light transmitting and absorbing resin member 2. . The laser beam L is directly emitted from directly above the butt region B there. As a result, a fusion bonding site M extending in the thickness direction of the first laser light transmitting and absorbing resin member 1 and in the plane direction of the second laser light transmitting and absorbing resin member 2 is formed. The members 1 and 2 are laser welded at the abutting portion B. The laser light L may be perpendicularly irradiated to the butt area B from the second laser light transmitting and absorbing resin member 2 side as shown by the two-dot chain line in the same figure. According to this, since the fusion bonding site M is formed also in the surface direction of the first laser light transmitting and absorbing resin member 1 and in the thickness direction of the second laser light transmitting and absorbing resin member 2, both laser light transmitting and absorbing characteristics are obtained. The laser welded body 10 in which the resin members 1 and 2 are laser welded to higher strength can be obtained. By repeating butt welding and overlapping welding, for example, when the application of the laser welded body is a container, a strongly welded laser welded body which does not leak the contents is obtained.

  Further, as shown in FIG. 5 (b), the laser-welded body 10 has a plate-like first laser light transmitting and absorbing resin member 1 and an L-shaped second laser light. It may be laser-welded in the contact part N which overlapped and contacted so that one surface of the permeable absorptive resin member 2 may overlap. In this case, the laser light L may be irradiated from the first laser light transmitting and absorbing resin member 1 side to the contact portion N, using the first laser light transmitting and absorbing resin member 1 as the laser light irradiated resin member, It may be irradiated directly toward the contact portion N exposed at the end of the laser light transmission / absorptive resin members 1 and 2, and the contact portion N is irradiated from the second laser light transmission / absorptive resin member 2 side It is also good. By repeating butt welding and overlapping welding, for example, when the application of the laser welded body is a container, a strongly welded laser welded body which does not leak the contents is obtained.

  Furthermore, as shown in FIG. 5C, the laser-welded body 10 has an L-shaped notch on one side of the rectangular parallelepiped, so that it has a step shape projecting on a part of one side thereof. Having a first laser light transmitting and absorbing resin member 1 having a connecting seam 1c, and a plate-like second laser light transmitting and absorbing resin member 2 fitted so as to abut on the step of the relay 1c It may be laser welded at this joint 1c. In this case, the laser welded body 10 is a butt portion B formed by butting the end of the second laser light transmitting and absorbing resin member 2 and the step of the joint 1c, and both laser light transmitting and absorbing resin members 1 and 2 And an abutting portion N continuously formed on the abutting portion B. The width of the step of the seam 1c and the thickness of the second laser light transmitting and absorbing resin member 2 are the same. As a result, the seam 1c and one surface of the second laser light transmitting and absorbing resin member 2 form a continuous flat surface, and the butted part B is exposed on this flat surface. The laser light L is irradiated from the first laser light transmittable resin member 1 side to the butt portion B from the first laser light transmittable resin member 1 using the first laser light transmittable resin member 1 as a laser light irradiated resin member, both laser light transmittable resins The members 1 and 2 are laser welded at the joint 1c. The laser beam L may be directly irradiated from the direction in which the butt portion B is extended to the outside of the laser welded body 10, and the second laser light transmitting / absorbing resin member 2 as a laser light irradiated resin member The contact portion N may be irradiated from a direction perpendicular to N. By repeating butt welding and overlapping welding, for example, when the application of the laser welded body is a container, a strongly welded laser welded body which does not leak the contents is obtained.

As shown in FIG. 5D, in the laser-welded body 10, a step-shaped joint 1c and a step-shaped joint 1c in which the first laser light transmitting and absorbing resin member 1 and the second laser light transmitting and absorbing resin member 2 are alternately combined. Each may have a relay 2c. The first laser light transmitting and absorbing resin member 1 and the second laser light transmitting and absorbing resin member 2 are combined at a right angle by the combination of the two joints 1c and 2c, and the laser welded body 10 has an L shape as a whole. ing. Upper butt joint portion B ₁ and lower butt joint portion B _{2 in which} the first laser light transmitting and absorbing resin member 1 and the second laser light transmitting and absorbing resin member 2 are butted to contact with each other by the combination of the two joint layers 1 c and 2 c And the contact part N which the 1st laser beam transparent absorptive resin member 1 and the 2nd laser beam transparent absorptive resin member 2 overlapped and contacted is formed. The upper abutting portion B ₁ , the abutting portion N, and the lower abutting portion B ₂ are continuously connected in this order. The laser light L is irradiated toward the contact portion N by using the first laser light transmitting and absorbing resin member 1 as a laser light irradiated resin member. In addition to this the laser beam L, may be directly irradiated toward it from directly above the upper butt portions B _1, butt upper second laser absorptive resin member 2 as the laser beam to be irradiated resin member it may be irradiated toward these in a direction perpendicular to the site B ₁ and site B ₂ abutting lower. By repeating butt welding and overlapping welding, for example, when the application of the laser welded body is a container, a strongly welded laser welded body which does not leak the contents is obtained.

As shown in FIG. 5 (e), in the laser-welded body 10, the first laser light transmitting and absorbing resin member 1 has a seam 1c forming a step shape, and the second laser light transmitting and absorbing property The resin member 2 may have a recess 2e which covers the joint 1c and is fitted thereto. The first laser light transmitting and absorbing resin member 1 and the second laser light transmitting and absorbing resin member 2 are combined at a right angle by the recess 2e being fitted in the joint film 1c, and the entire laser welded body 10 is It is L-shaped. Upper butt joint portion B ₁ and lower butt joint portion B in which the first laser light transmitting and absorbing resin member 1 and the second laser light transmitting and absorbing resin member 2 are butted to contact with each other by fitting the seam 1c and the recess 2e. _2, and the first laser-transmissible-absorptive resin member 1 and the second laser-transmissible-absorptive resin member 2 and the contact portion N in contact with overlap. The upper abutment portion B ₁ , the abutment portion N, and the lower abutment portion B ₂ are continuously connected in this order. The laser light L is irradiated directly against it from directly above the upper butt portions B _1. In addition to this, the second laser light transmitting and absorbing resin member 2 is used as a laser light irradiated resin member, and the laser light L is irradiated from a direction perpendicular to the abutting portion N and the lower abutting portion B ₁ from these. It may be By repeating butt welding and overlapping welding, for example, when the application of the laser welded body is a container, a strongly welded laser welded body which does not leak the contents is obtained.

As shown in FIGS. 5 (a) to 5 (e), in the laser-welded body 10, the respective laser light transmitting and absorbing resin members 1 and 2 are combined in a complicated manner, or they have a complicated shape. The resin members are continuously and firmly and firmly laser-welded by laser beam irradiation from multiple directions even if they have continuous contact portions and butt portions so as to be alternately repeated. . Thereby, this laser welding body 10 dramatically improves the degree of freedom of design of resin parts using it. The two laser light transmitting and absorbing resin members 1 and 2 constituting the laser welded body 10 shown in the same figure have the same absorbance a ₁ and a ₂ (a ₁ = a ₂ ). Is preferred. According to it, when both laser light transmission and absorption resin members 1 and 2 have the same shape, it is possible to distinguish both laser light transmission and absorption resin members 1 and 2 in the manufacturing process of the laser welded body 10 Since it is not necessary, the manufacturing process of the laser welding body 10 can be simplified.

The perspective view in the middle of manufacturing another laser welding body 10 is shown in FIG. 6 (a). The cylindrical first laser light transmitting and absorbing resin member 1 having both open ends has a body portion 1e and an outer diameter reduced from the body portion 1e, and an insertion joint along the opening edge of one end thereof It has 1d. The insertion joint 1d is a step portion 1d ₁ recessed from the outer peripheral surface of the first laser light transmitting and absorbing resin member 1 having a cylindrical shape at a right angle toward the inner peripheral surface thereof, and from the step 1d ₁ and a insertion portion 1d ₂ extending vertically downwardly. Whereby the outer diameter of the first laser-transmissible-absorptive resin member 1 is reduced in diameter at the step portion 1d _1. Further, the cylindrical second laser light transmitting and absorbing resin member 2 having open ends has a joining joint 2d along the opening edge of one end thereof. The joint seam 2d is an inner peripheral surface of the second laser light transmitting and absorbing resin member 2 having a cylindrical shape, and an opening edge 2d ₁ recessed at a right angle toward the outer peripheral surface thereof and the opening edge 2d ₁ And a bonding portion 2d ₂ extending vertically upward. As a result, the inner diameter of the second laser light transmitting and absorbing resin member 2 is enlarged at the joint joint 2d. The outer diameter of the insertion portion 1d ₂ is slightly smaller than the inner diameter of篏合portion 2d _2. As a result, both the laser light transmitting and absorbing resin members 1 and 2 are fitted while having a play that allows insertion and removal between the insertion portion 1 d ₂ and the joint portion ₂ d ₂ . The step portion 1d ₁ and the opening edge 2d ₁ has the same width. Thus, when both laser light transmitting and absorbing resin members 1 and 2 are combined in both joining layers 1d and 2d, both laser light transmitting and absorbing resin members have an outer peripheral surface which is smoothly curved and has no step. A cylinder connecting 1 and 2 is formed. The laser beam L is emitted toward the junctions 1d and 2d so as to go around the outer peripheral surface of the cylinder.

FIG. 6 (b) shows a partially enlarged longitudinal sectional view of FIG. 6 (a). The upper contact portion N ₁ and the lower side in which the first laser light transmitting and absorbing resin member 1 and the second laser light transmitting and absorbing resin member 2 overlap and contact with each other by combining the two joint layers 1 d and 2 d. An abutting portion N ₂ and a butted portion B in which the first laser light transmitting and absorbing resin member 1 and the second laser light transmitting and absorbing resin member 2 are butted to contact with each other are formed. The upper contact portion N ₁ , the butt portion B, and the lower contact portion N ₂ are continuously connected in this order. The laser beam L is irradiated toward the butt spot B directly from the direction in which the butt spot B is extended to the outside of the laser welded body 10. Whereby both the laser-transmissible-absorptive resin members 1 and 2 are laser-welded at the upper contact portion N _1. In addition the figure, as indicated by the two-dot chain line, the laser beam L is irradiated with a second laser-transmissible-absorptive resin member 2 as the laser beam to be irradiated resin member, the butt portion B and lower contact portion N ₂ It may be done. According to this, since both junctions 1 and 2 are laser-welded over the entire surface, it is possible to obtain the laser-welded body 1 in which both the laser light transmitting and absorbing resin members 1 and 2 are more firmly welded.

  The perspective view in the middle of manufacturing another laser welding body 10 is shown in FIG. 7 (a). Both cylindrical laser light transmitting and absorbing resin members 1 and 2 having both open ends do not have joints, but their end portions are butted to form a butt portion B in contact at the opening edge. It is also good. The laser welded body 10 is obtained by irradiating the laser light L around the circumference along the butt region B.

Further, as shown in FIG. 7 (b), the opening of both the laser light transmitting and absorbing resin members 1 and 2 in which the laser light transmitting resin member 3 having a ring shape as the laser light irradiated resin member has a cylindrical shape. A butt portion B formed by butt-together edge may be surrounded. The laser ray transmitting resin member 3 has the same absorbance b as that shown in FIG. According to it, by the superposition of the laser beam transmitting resin member 3 and the first laser beam transmitting and absorbing resin member 1, the upper contact portion N ₁ is the laser beam transmitting resin member 3 and the second laser beam transmitting and absorbing property By overlapping with the resin member 2, lower contact portions N ₂ are formed respectively. The laser beam L is irradiated from the side of the laser beam transmitting resin member 3 toward the butt region B and irradiated over the entire circumference of the laser beam L, so that the laser beam transmitting resin member 3, the first laser beam transmitting and absorbing resin member 1, and The laser welding body 10 which the 2nd laser beam transparent absorptive resin member 2 integrated is obtained.

  FIG. 7 shows a method of obtaining a laser-welded body by scanning the laser light L with respect to the laser light transmitting and absorbing resin member, but the laser light L is emitted from the fixed radiation source, and the laser light transmitting and absorbing property is obtained. The laser-welded material may be manufactured by rotating or moving the laser light transmitting and absorbing resin member so as to scan along the region to which the resin member is to be attached. For example, as shown in FIG. 8, laser light emitted from a fixed source which first abuts on both ends of cylindrical both laser light transmitting and absorbing resin members 1 and 2 having open ends and abuts and fixes them. While irradiating L to it, while fixing the central axes of both the laser light transmitting and absorbing resin members 1 and 2, it is rotated in the circumferential direction. As a result, the laser beam L scans along the butt region B, and a laser welded body in which both the laser light transmitting and absorbing resin members 1 and 2 are welded at the butt region B is obtained. According to the outer shape of the laser light transmitting and absorbing resin member to be welded, and the shapes of the abutting portion B and the abutting portion N, the output and frequency of the laser beam L, the rotational speed and moving speed of the laser light transmitting and absorbing resin member ( That is, the scanning speed of the laser beam L can be set arbitrarily, and the laser-welded body welded by desired tensile strength can be produced.

  As the laser light L, an infrared ray of 800 to 1600 nm longer than visible light, preferably a laser light having an oscillation wavelength of 800 to 1100 nm can be used. For example, solid-state lasers (Nd: YAG excitation and / or semiconductor laser excitation), semiconductor lasers, tunable diode lasers, and titanium sapphire lasers (Nd: YAG excitation) can be suitably used. In addition, a halogen lamp or a xenon lamp which generates an infrared ray having a wavelength of 700 nm or more may be used. The irradiation angle of the laser light L may be perpendicular or oblique to the surface of the resin member to be irradiated with laser light, and may be irradiated from one direction or plural directions.

  In the case of using a halogen lamp that generates infrared light having a wavelength of 700 nm or more, for example, as a lamp shape, one in which the lamps are arranged in a band shape can be mentioned. As the irradiation mode, for example, a scanning type capable of irradiating a laser beam over a wide range by moving the lamp irradiation portion, a masking type in which a member to be welded moves, and various types of resin members to be welded There is a type in which the lamp is simultaneously irradiated. The irradiation can be performed by adjusting various conditions such as the irradiation width of infrared light, the irradiation time, and the irradiation energy as appropriate. Since a halogen lamp has an energy distribution centered on the near infrared region, energy may be present on the short wavelength side of the energy distribution, that is, in the visible region. In such a case, welding marks may be generated on the surface of the incident member, so that a cut filter may be used to block the energy in the visible region, for example.

The absorption coefficient ε _d (ml / g · cm) of the nigrosine sulfate which is a laser light absorber is 1000 to 8000, preferably 1000 to 6000, and more preferably 3000 to 6000 (ml / g · cm) . The method of measuring the absorption coefficient (absorption coefficient) ε _d is to precisely weigh 0.05 g of the laser light absorber, and dissolve it in, for example, solvent N, N-dimethylformamide (DMF) using a 50 ml volumetric flask, and then 1 ml of it. Is diluted with DMF using a 50-ml volumetric flask to make a measurement sample, and the absorbance is measured using a spectrophotometer (trade name: UV1600PC, manufactured by Shimadzu Corporation).

  The coloring of the thermoplastic resin is carried out for the purpose of decoration effect, color classification effect, improvement of light resistance of molded articles, protection of contents and concealment. Most important in the industry is black coloration. In addition, since the dispersibility in the resin and the compatibility with the resin are good, coloring with an oil-soluble dye is suitable. Among them, nigrosine which can be used as a black colorant and as a laser light absorber, and which can obtain higher bonding strength, and a processed product thereof are preferable.

  As nigrosine, C.I. I. Solvent Black 5 and C.I. I. Black azine-based condensation mixtures as described in the Color Index as Solvent Black 7 can be mentioned. From the viewpoint of improving the fluidity of the thermoplastic resin, C.I. I. Solvent Black 7 is more preferred. Such nigrosine can be synthesized, for example, by oxidation and dehydration condensation of aniline, aniline hydrochloride and nitrobenzene at a reaction temperature of 160 to 180 ° C. in the presence of iron chloride.

  According to a system using iron chloride of nigrosine as a raw material, a reaction in the presence of iron chloride or excess hydrochloric acid occurs, so nigrosine hydrochloride is formed. To obtain nigrosine sulfate from nigrosine hydrochloride, it is not particularly limited as long as all or a substantial portion of the chloride ions constituting the salt in nigrosine are replaced with sulfate ions, using a known reaction method. obtain. In addition, nigrosine sulfate is C.I. I. C.I. oil-soluble black dyes belonging to C.I. I. It is not a water-soluble black dye belonging to Acid Black 2.

  Specifically, for example, a method of dispersing nigrosine in dilute sulfuric acid and heating appropriately (for example, 50 to 90 ° C.) can be mentioned to produce nigrosine sulfate. For example, it is manufactured by disperse | distributing the condensation reaction liquid obtained by manufacturing nigrosine in dilute sulfuric acid, and heating it moderately (for example, 50-90 degreeC). Furthermore, for example, nigrosine sulfate can also be produced by adding a large amount of ice water to a solution obtained by dissolving nigrosine in concentrated sulfuric acid while adjusting the temperature of the reaction solution to a low temperature so that sulfonation does not occur. . The obtained nigrosine sulfate crystals may be subjected to a washing and purification step and then to a drying step.

In the nigrosine sulfate, when the sulfate ion concentration is 0.3 to 5.0% by mass, preferably 0.5 to 3.5% by mass, the effect of lowering the crystal temperature is increased, so that the stability is simplified Laser welding can be performed. The sulfate ion concentration of nigrosine sulfate can be measured by extracting sulfate ion from a sample of nigrosine and using instrumental analysis of ion chromatography. In the manufacturing process of nigrosine sulfate, impurities, inorganic salts and the like in nigrosine sulfate are removed, so that the insulating property of nigrosine sulfate is improved. Therefore, such nigrosine sulfate can be suitably used as a material of an article such as an electronic component or an electrical component, of which the insulation property is important. The volume resistivity of nigrosine sulfate is 1.0 × 10 ⁹ Ω · cm or more, preferably 5.0 × 10 ⁹ Ω · cm to 7.0 × 10 ¹¹ Ω · cm, 8.0 X 10 ⁹ Ω · cm to 1.0 × 10 ¹¹ Ω · cm is more preferable, and 1.0 × 10 ¹⁰ Ω · cm to 1.0 × 10 ¹¹ Ω · cm is more preferable. The volume resistivity of nigrosine sulfate is determined as follows. A sample of which a fixed amount of nigrosine sulfate is measured is solidified by applying a load of 200 kgf, and the volume of the sample is determined. Next, the sample is measured with a digital ultra-high resistance / micro-ammeter (trade name: 8340A, manufactured by ADC Corporation).

  Furthermore, a step of heating the nigrosine obtained as described above under reduced pressure may be provided, and the purified nigrosine obtained thereby may be used. As such nigrosine, purified aniline having aniline and diphenylamine less than 0.1% can be exemplified. As such nigrosine, the NUBIAN (R) BLACK series is commercially available. The preferred aniline concentration in nigrosine is, for example, 0.1 mass% or less, preferably 0.005 mass% to 0.08 mass% or less of nigrosine.

The content of the laser light absorbing agent such as nigrosine for adjusting the absorbance a ₁ and the absorbance a ₂ is 0.01 to 0.2 mass% in both the laser light transmitting and absorbing resin members 1 and 2, preferably It is 0.01-0.1 mass%. When the content is less than 0.01% by mass, the absorbance a ₁ and the absorbance a ₂ do not meet the above lower limit values. Therefore, since the calorific value of both laser light transmitting and absorbing resin members 1 and 2 which absorbed a part of the energy of the laser light is insufficient, they do not heat up sufficiently, and welding at the butt area B and the contact area N As a result, the bonding strength between the two laser light transmitting and absorbing resin members 1 and 2 is insufficient. Further, when the content exceeds 0.2 mass%, the absorbance a ₁ and the absorbance a ₂ exceeds the upper limit of the above. Therefore, the laser light transmittances of both the laser light transmission and absorption resin members 1 and 2 decrease excessively, and only the first laser light transmission and absorption resin member 1 which is a laser light irradiated resin member generates energy absorption excessively. Since it heats up and melts, both the laser light transmitting and absorbing resin members 1 and 2 can not be welded uniformly, and high bonding strength can not be obtained. Furthermore, when the laser beam irradiated resin member disposed on the laser beam incident side absorbs the energy of the laser beam excessively, it has resin characteristics such as physical and chemical properties possessed by the thermoplastic resin that is the raw material of the resin member. It is easy to lose.

  200-5000 micrometers is preferable, as for the thickness of each resin member 1, 2, 3, 500-4000 micrometers is more preferable, and 700-3500 micrometers is still more preferable. If the thickness is less than 200 μm, it is difficult to control the laser light energy, and during laser welding, excess and deficiency of heat melting may occur, and breakage due to overheating and insufficient heat may result in insufficient bonding strength. On the other hand, if the thickness exceeds 5000 μm, the distance to the portion to be welded is long, so the laser light incident on the laser light transmitting and absorbing resin member 2 is attenuated without being transmitted to the inside thereof, Sufficient bonding strength can not be obtained. If the thickness of both the laser light transmitting and absorbing resin members 1 and 2 is 800 to 3000 μm, a molten pool necessary for welding is sufficiently formed, which is more preferable from the viewpoint of industrially stable implementation of laser welding.

  The thermoplastic resin contained in each of the resin members 1, 2, 3 is not particularly limited as long as it can absorb and / or transmit laser light and can contain a laser light absorbent. As such a thermoplastic resin, a thermoplastic resin used as a pigment dispersant and a thermoplastic resin used as a carrier of a master batch or colored pellets can be mentioned.

  Specific examples of the thermoplastic resin include polyolefin resins such as polyphenylene sulfide resin (PPS), polyamide resin (nylon (registered trademark), PA), polyethylene resin (PE) and polypropylene resin (PP); polystyrene resin (PS); polymethylpentene resin; methacrylic resin; acrylic polyamide resin; ethylene vinyl alcohol (EVOH) resin; polycarbonate resin; polyester resin such as polyethylene terephthalate (PET) resin and polybutylene terephthalate (PBT) resin; polyacetal resin; Polyvinyl chloride resin; aromatic vinyl resin; polyvinylidene chloride resin; polyphenylene oxide resin; polyarylate resin; polyallyl sulfone resin; polyphenylene oxide resin; acrylic resin Acrylic resin such as amide resin and polymethyl methacrylate resin (PMMA); include and liquid crystal polymer; fluororesin. These thermoplastic resins may be used alone or in combination of two or more.

  The thermoplastic resin may be a copolymer resin in which a plurality of types of monomers forming this are bonded. For example, AS (acrylonitrile-styrene) copolymer resin, ABS (acrylonitrile-butadiene-styrene) copolymer resin, AES (acrylonitrile-EPDM-styrene) copolymer resin, PA-PBT copolymer resin, PET-PBT Copolymer resin, PC-PBT copolymer resin, PS-PBT copolymer resin, and PC-PA copolymer resin are mentioned. In addition, thermoplastic elastomers such as polystyrene thermoplastic elastomers, polyolefin thermoplastic elastomers, polyurethane thermoplastic elastomers, and polyester thermoplastic elastomers, and synthetic waxes and natural waxes containing these resins as main components may be mentioned. In addition, the molecular weight of these thermoplastic resins is not specifically limited. Moreover, you may use these thermoplastic resins individually or in mixture of multiple types.

  The thermoplastic resin is preferably a polyamide resin; a polycarbonate resin; a polypropylene resin; a polyester resin such as a polybutylene terephthalate resin; a polyphenylene sulfide resin. Among them, polyamide resins and polycarbonate resins are more preferable from the viewpoint of showing good compatibility with a laser light absorber such as nigrosine.

  The polyamide resin used in the present invention is a polyamide polymer which has an acid amide group (-CONH-) in its molecule and can be heat-melted. The polyamide resin is preferably a polyamide resin containing at least one selected from a salt composed of an aliphatic diamine and an aromatic dicarboxylic acid and a salt composed of an aromatic diamine and an aliphatic dicarboxylic acid as the structural unit (a). The proportion of the structural unit (a) in all the structural units of the polyamide resin is preferably 30 mol% or more, more preferably 40 mol% or more. More specifically, various polyamide resins such as polycondensates of lactam, polycondensates of diamine and dicarboxylic acid, polycondensates of ω-aminocarboxylic acid, or copolyamide resins or blends thereof. is there. As a lactam which is a raw material of the polycondensation of a polyamide resin, (epsilon) -caprolactam, and (omega)-lauro lactam etc. are mentioned, for example.

  Examples of diamines include tetramethylenediamine, pentamethylenediamine, hexamethylenediamine, octamethylenediamine, undecamethylenediamine, dodecamethylenediamine, 2-methylpentamethylenediamine, (2, 2, 4- or 2, 4, 4 −) Trimethylhexamethylenediamine, 5-methylnonanemethylenediamine, metaxylylenediamine (MXDA), paraxylylenediamine, 1,3-bis (aminomethyl) cyclohexane, 1,4-bis (aminomethyl) cyclohexane, 1 -Amino-3-aminomethyl-3,5,5-trimethylcyclohexane, bis (4-aminocyclohexyl) methane, bis (3-methyl-4-aminocyclohexyl) methane, 2,2-bis (4-aminocyclohexyl) Propane, bis Aminopropyl) piperazine, and aliphatic, such as aminoethylpiperazine, alicyclic, and a diamine of the aromatic and the like.

  Examples of dicarboxylic acids include adipic acid, suberic acid, azelaic acid, sebacic acid, dodecanedioic acid, terephthalic acid, isophthalic acid, 2-chloroterephthalic acid, 2-methylterephthalic acid, 5-methylisophthalic acid, 5-sodium sulfo Examples thereof include aliphatic, alicyclic and aromatic dicarboxylic acids such as isophthalic acid, hexahydroterephthalic acid, and hexahydroisophthalic acid.

  Examples of the ω-aminocarboxylic acid include 6-aminocaproic acid, 11-aminoundecanoic acid, 12-aminododecanoic acid, and paraaminomethylbenzoic acid.

  Furthermore, as a polyamide resin, polyamide 4, polyamide 6, polyamide 6I, polyamide 11, polyamide 12, polyamide 46, polyamide 56, polyamide 66, polyamide 69, polyamide 610, polyamide 612, polyamide 6 T, polyamide 96, polyamide 9 T, amorphous Polyamides, high melting point polyamides, polyamide RIM, polyamide MIX6, polyamide MXD6, polyamide MP6, and copolymers of two or more thereof. As this copolymer, specifically, polyamide 6/12 copolymer, polyamide 6/66 copolymer, polyamide 66 / 6I copolymer, polyamide 6I / 6T copolymer, polyamide 6/66/610 copolymer Examples include coalesced, polyamide 6/66/11/12 copolymer, and crystalline polyamide / noncrystalline polyamide copolymer. The polyamide resin may be a mixed polymer of a polyamide resin and another synthetic resin. Examples of such mixed polymers are polyamide / polyester mixed polymers, polyamide / polyphenylene oxide mixed polymers, polyamide / polycarbonate mixed polymers, polyamide / polyolefin mixed polymers, polyamide / styrene / acrylonitrile mixed polymers, polyamide / Acrylic ester mixed polymers, and polyamide / silicone mixed polymers can be mentioned. You may use these polyamide resins individually or in mixture of multiple types.

  Polyphenylene sulfide (PPS) resin is a polymer mainly having a repeating unit consisting of a thiophenylene group represented by (-φ-S-) [φ is a substituted or unsubstituted phenylene group]. The PPS resin is obtained by polymerizing a monomer synthesized by reacting paradichlorobenzene with an alkali sulfide under high temperature and high pressure. PPS resins are of two types: linear type which has been made to have the desired degree of polymerization only by a polymerization step using a polymerization auxiliary, and cross-linked type which is obtained by thermally crosslinking low molecular polymers in the presence of oxygen. Roughly classified. In particular, a linear PPS resin is preferable in terms of excellent laser light transmittance. The melt viscosity of the PPS resin is not particularly limited as long as it can be melt-kneaded, but is preferably in the range of 5 to 2000 Pa · s, and more preferably in the range of 100 to 600 Pa · s.

  The PPS resin may be a polymer alloy. For example, PPS / polyolefin alloy, PPS / polyamide alloy, PPS / polyester alloy, PPS / polycarbonate alloy, PPS / polyphenylene ether alloy, PPS / liquid crystal polymer alloy, PPS / polyimide alloy, and PPS / polysulfone There is a system alloy. PPS resin is suitable for use in, for example, electronic parts and automobile parts because it has chemical resistance, heat resistance and high strength.

  Examples of polyester resins include polyethylene terephthalate resins obtained by the polycondensation reaction of terephthalic acid and ethylene glycol, and polybutylene terephthalate resins obtained by the polycondensation reaction of terephthalic acid and butylene glycol. As an example of other polyester resin, 15% by mole or less (eg 0.5 to 15% by mole), preferably 5% by mole or less (eg 0.5 to 5% by mole) of terephthalic acid component, and / or ethylene glycol And terephthalic acid components and glycols such as 15 mol% or less (eg 0.5 to 15 mol%), preferably 5 mol% or less (eg 0.5 to 5 mol%) in the glycol component such as butylene glycol The copolymer which substituted one part in a component, for example by the substituent like a C1-C4 alkyl group is mentioned. Moreover, you may use polyester resin individually or in mixture of multiple types.

  Specifically, aromatic dicarboxylic acids or ester-forming derivatives thereof are preferably used as the dicarboxylic acid compound constituting the polyester resin. As aromatic dicarboxylic acid, terephthalic acid, isophthalic acid, orthophthalic acid, 1,5-naphthalenedicarboxylic acid, 2,5-naphthalenedicarboxylic acid, 2,6-naphthalenedicarboxylic acid, biphenyl-2,2'-dicarboxylic acid, biphenyl -3,3'-dicarboxylic acid, biphenyl-4,4'-dicarboxylic acid, diphenylether-4,4'-dicarboxylic acid, diphenylmethane-4,4'-dicarboxylic acid, diphenylsulfone-4,4'-dicarboxylic acid, Diphenylisopropylidene-4,4'-dicarboxylic acid, 1,2-bis (phenoxy) ethane-4,4'-dicarboxylic acid, anthracene-2,5-dicarboxylic acid, anthracene-2,6-dicarboxylic acid, p- Terphenylene-4,4'-dicarboxylic acid and pyridine-2,5-dicarboxylic acid And the like, the terephthalic acid can be preferably used. These aromatic dicarboxylic acids may be used as a mixture of two or more. As these are well known, dimethyl ester etc. can be used for polycondensation reaction as an ester-forming derivative other than a free acid. In addition, if it is a small amount, aliphatic dicarboxylic acids such as adipic acid, azelaic acid, dodecanedioic acid, and sebacic acid, 1,2-cyclohexanedicarboxylic acid, 1,3-cyclohexanedicarboxylic acid together with these aromatic dicarboxylic acids. An acid and an alicyclic dicarboxylic acid such as 1,4-cyclohexanedicarboxylic acid can be used as a mixture of one or more.

  Aliphatic diols such as ethylene glycol, propylene glycol, butanediol, hexylene glycol, neopentyl glycol, 2-methylpropane-1,3-diol, diethylene glycol, and triethylene glycol as dihydroxy compounds constituting polyester resin And cycloaliphatic diols such as cyclohexane-1,4-dimethanol and the like, and mixtures thereof. If the amount is small, one or more long chain diols having a molecular weight of 400 to 6000, that is, polyethylene glycol, poly-1,3-propylene glycol, polytetramethylene glycol and the like may be copolymerized. Also, aromatic diols such as hydroquinone, resorcine, naphthalenediol, dihydroxydiphenyl ether, and 2,2-bis (4-hydroxyphenyl) propane may be used. In addition to the above difunctional monomers, trifunctional monomers such as trimellitic acid, trimesic acid, pyromellitic acid, pentaerythritol, and trimethylolpropane for introducing a branched structure, and fatty acids for molecular weight control. Etc. can be used in combination in a small amount.

  As the polyester resin, one containing polycondensation of a dicarboxylic acid and a diol, that is, one containing 50% by mass, preferably 70% by mass or more of this polycondensate with respect to the entire resin is used. As dicarboxylic acid, aromatic carboxylic acid is preferable, and as diol, aliphatic diol is preferable. More preferred is polyalkylene terephthalate in which at least 95% by mole of the acid component is terephthalic acid, and at least 95% by mass of the alcohol component is an aliphatic diol. Examples include polybutylene terephthalate and polyethylene terephthalate. It is preferable that these are close to homopolyesters, that is, 95% by mass or more of the whole resin is a terephthalic acid component and 1,4-butanediol or ethylene glycol component. As a polyester resin, it is preferable that a main component is polybutylene terephthalate. The polybutylene terephthalate may be a copolymer such as isophthalic acid, dimer acid, and polyalkylene glycol such as polytetramethylene glycol (PTMG).

  Examples of polyolefin resins include homopolymers of α-olefins such as ethylene, propylene, butene-1, 3-methylbutene-1, 4-methylpentene-1 and octene-1, copolymers thereof, and these And copolymers with other copolymerizable unsaturated monomers (copolymers may include block copolymers, random copolymers and graft copolymers). More specifically, polyethylene resins such as high density polyethylene, medium density polyethylene, low density polyethylene, linear low density polyethylene, ethylene-vinyl acetate copolymer, and ethylene-ethyl acrylate copolymer; propylene Examples thereof include homopolymers, propylene-ethylene block copolymers or random copolymers, and polypropylene resins such as propylene-ethylene-butene-1 copolymers; polybutene-1 and poly 4-methylpentene-1 . These polyolefin resins may be used alone or in combination of two or more. Among these, polyethylene resin and / or polypropylene resin are preferable. More preferably, it is a polypropylene resin. The molecular weight of the polypropylene resin is not particularly limited, and a wide range of molecular weights can be used.

  In addition, you may use what contained the foaming agent in resin itself like acid-modified polyolefin denatured by unsaturated carboxylic acid or its derivative, and foaming polypropylene as polyolefin resin. Also, ethylene-α-olefin copolymer rubber, ethylene-α-olefin-nonconjugated diene compound copolymer (eg EPDM), ethylene-aromatic monovinyl compound-conjugated diene compound copolymer rubber, and these The hydrogenated rubber may be contained in the polyolefin resin.

  The polycarbonate resin is a thermoplastic resin having a carbonic acid ester bond in the main chain, and is an engineering plastic having excellent mechanical properties, heat resistance, cold resistance, electrical properties, and transparency. As polycarbonate resin, any of aromatic polycarbonate resin and aliphatic polycarbonate resin can be used, and aromatic polycarbonate resin is preferable. The aromatic polycarbonate resin is a thermoplastic polymer obtained by reacting an aromatic dihydroxy compound or this and a small amount of a polyhydroxy compound with phosgene or a carbonic diester. The aromatic polycarbonate resin may be branched or may be a copolymer. The method for producing the aromatic polycarbonate resin is not particularly limited, and the aromatic polycarbonate resin can be produced by a conventionally known phosgene method (interface polymerization method) or a melting method (ester exchange method). Moreover, when using the aromatic polycarbonate resin obtained by a melting method, you may adjust the amount of OH groups of a terminal group.

  As an aromatic dihydroxy compound which is a raw material of an aromatic polycarbonate resin, 2,2-bis (4-hydroxyphenyl) propane (that is, bisphenol A), tetramethylbisphenol A, bis (4-hydroxyphenyl) -p-diisopropylbenzene Hydroquinone, resorcinol, and 4,4-dihydroxydiphenyl etc., and preferably bisphenol A. Moreover, you may use the compound which one or more tetraalkyl phosphonium sulfonate couple | bonded with said aromatic dihydroxy compound. In order to obtain a branched aromatic polycarbonate resin, a part of the above-mentioned aromatic dihydroxy compound is added to a branching agent such as phloroglucin, 4,6-dimethyl-2,4,6-tri (4-hydroxyphenyl) heptene- 2,4,6-Dimethyl-2,4,6-tri (4-hydroxyphenyl) heptane, 2,6-dimethyl-2,4,6-tri (4-hydroxyphenyl) heptene-3,1,3,3, Polyhydroxy compounds such as 5-tri (4-hydroxyphenyl) benzene and 1,1,1-tri (4-hydroxyphenyl) ethane and the like, or 3,3-bis (4-hydroxyaryl) oxindoles The compound may be substituted with a compound such as isatin bisphenol), 5-chloroisatin, 5,7-dichloroisatin, and 5-bromoisatin. The amount of the compound to be substituted is usually 0.01 to 10 mol%, preferably 0.1 to 2 mol%, based on the aromatic dihydroxy compound.

  Among the above-mentioned aromatic polycarbonate resins, polycarbonate resins derived from 2,2-bis (4-hydroxyphenyl) propane, or 2,2-bis (4-hydroxyphenyl) propane and other aromatic dihydroxy compounds Polycarbonate copolymers derived from and are preferred. The aromatic polycarbonate resin may be a copolymer of a polycarbonate resin as a main component and a polymer or oligomer having a siloxane structure. Furthermore, you may mix and use 2 or more types of above-described aromatic polycarbonate resin.

Since the first laser light transmitting and absorbing resin member 1 and the second laser light transmitting and absorbing resin member 2 contain nigrosine sulfate which is a black coloring agent as a laser light absorbing agent, they are gray according to their content. It has a black color tone. However, since the nigrosine sulfate content is determined so as to obtain an absorbance a ₁ and an absorbance a _{2 of} 0.09 to 0.9, preferably 0.1 to 0.5, both of the laser light transmitting and absorbing resins For example, the color density of the members 1 and 2 may not be sufficient, and may have a light color such as gray. In such a case, in order to give both laser light transmission and absorption resin members 1 and 2 a desired color density, the first laser light transmission and absorption resin member composition and / or the second for molding the same. A coloring agent may be added to the composition for laser ray transmitting and absorbing resin member. A coloring agent can also be added to the composition for laser ray transmitting resin members for forming the laser ray transmitting resin member 3. Thereby, for example, the same color can be given to each of the resin members 1, 2, 3 to make the interface between them and the welding mark less noticeable.

  A coloring agent is selected according to the hue and color density of the thermoplastic resin contained in this resin composition. For example, when a deep black color is applied to both laser light transmitting and absorbing resin members 1 and 2, a combination of blue colorant, yellow colorant and red colorant, combination of violet colorant and yellow colorant, green As with the combination of colorants and red colorants, multiple colorants can be combined to prepare a black colorant.

  The structure and color of the colorant are not particularly limited, and more specifically, azomethine type, anthraquinone type, quinacridone type, dioxazine type, diketopyrrolopyrrole type, anthrapyridone type, isoindolinone type, indanthrone type, Examples of the coloring agent include various organic dyes and pigments such as dyes and pigments of perinone type, perylene type, indigo type, thioindigo type, quinophthalone type, quinoline type, and triphenylmethane type.

  Such a colorant is preferably a combination of a plurality of dyes which absorb in the visible range, are highly compatible with the thermoplastic resin, and have low scattering characteristics for laser light. Furthermore, the coloring agent is not easily discolored even when exposed to high temperatures at the time of molding of each resin member 1, 2, 3 or when it is melted by irradiation of laser light, and has excellent heat resistance. It is more preferable that it is a thing which does not have absorption in the wavelength of, but has transparency. Examples of colorants having transparency to the wavelength of laser light include colorants containing anthraquinone dyes.

Such anthraquinone dyes are preferably anthraquinone oil-soluble dyes, and specifically, for example,
C. I. Solvent Blue 11, 12, 13, 14, 26, 35, 36, 44, 45, 48, 49, 58, 59, 63, 68, 69, 70, 78, 79, 83, 87, 90, 94, 97, 98, 101, 102, 104, 105, 122, 129, and 132;
C. I. Disperse Blue 14, 35, 102, and 197;
C. I. Solvent Green 3, 19, 20, 23, 24, 25, 26, 28, 33, and 65;
C. I. Solvent Violet 13, 14, 15, 26, 30, 31, 33, 34, 36, 37, 38, 40, 41, 42, 45, 47, 48, 51, 59, and 60 are commercially available. Dye is mentioned.

  Anthraquinone dyes include those having a maximum absorption wavelength in the range of 590 to 635 nm. Such anthraquinone dyes often exhibit a blue color, and for example, have high visibility as compared to anthraquinone green dyes. When combining a black mixed dye, a deep black colorant having high coloring power can be obtained by combining an anthraquinone blue dye with a red dye or a yellow dye by subtractive color mixing.

  The 940 nm laser light transmittance of the anthraquinone dye is preferably 60 to 95%. Examples of such anthraquinone dyes which are commercially available include "NUBIAN (registered trademark) BLUE series" and "OPLAS (registered trademark) BLUE series" (both trade names, manufactured by Orient Chemical Industries, Ltd.), etc. .

  The electrical conductivity of the anthraquinone dye is preferably 50 to 500 μS / cm. Since the insulation of each resin member 1, 2, 3 can be improved according to it, the laser weldment 10 is suitable for resin parts requiring high insulation such as electric / electronic equipment parts and precision equipment parts. It can be used for

  The electrical conductivity is measured as follows. Disperse 5 g of the sample anthraquinone dye in 500 mL of deionized water, and record the weight. The mixture is boiled to extract ionic components and then filtered. Ion-exchanged water is added until the weight of the filtrate is the same as the previously measured weight, and the conductivity of this solution is measured with a conductivity meter (product name: AOL-10, manufactured by Toa DK Co., Ltd.).

  Dye combinations include, for example, combinations of anthraquinone blue dyes and blue dyes, red dyes, and yellow dyes, and combinations of anthraquinone blue dyes with green dyes, red dyes, and yellow dyes. As this red dye or yellow dye, an azo dye, quinacridone dye, dioxazine dye, quinophthalone dye, perylene dye, perinone dye, isoindolinone dye, azomethine dye, triphenylmethane dye, and red or yellow anthraquinone dye can be mentioned. One or more of these may be used in combination. As a dye which gives favorable color development property to both resin composition of a laser beam permeable absorptive resin composition and a laser beam permeable resin composition, a perinone dye and a red or yellow anthraquinone dye are mentioned.

  Preferably, a combination of anthraquinone blue dye and a red dye as described above having a maximum absorption wavelength in the range of 590-635 nm is used. Suitable examples include the perinone dyes as described above which have good heat resistance and often exhibit red color. Examples of commercially available products of such red dyes include "NUBIAN (registered trademark) RED series" and "OPLAS (registered trademark) RED series" (both trade names, manufactured by Orient Chemical Industries, Ltd.).

As a perinone dye, specifically, for example,
C. I. Solvent Orange 60;
C. I. Solvent Red 135, 162, 178, and 179.

As anthraquinone red dyes (including anthrapyridone dyes), for example,
C. I. Solvent Red 52, 111, 149, 150, 151, 168, 191, 207, and 227;
C. I. Disperse Red 60 is mentioned. Such perinone dyes and anthraquinone red dyes are commercially available under the Color Index above.

  Anthraquinone yellow dyes are preferred as dyes used in combination with such anthraquinone red dyes. In the colorant, the range of (i) mass of anthraquinone yellow dye / (ii) mass ratio of blue, green and / or purple anthraquinone dye (i) / (ii) is 0.15 to 1.0 Is preferred. Examples of commercially available products of anthraquinone yellow dyes include "NUBIAN (registered trademark) YELLOW series" and "OPLAS (registered trademark) YELLOW series" (both trade names, manufactured by Orient Chemical Industry Co., Ltd.).

As a yellow dye, for example,
C. I. Solvent Yellow 14, 16, 32, 33, 43, 44, 93, 94, 98, 104, 116, 133, 145, 157, 163, 164, 167, 181, 182, 183, 184, 185, and 187 ;
C. I. Dyes commercially available under the Vat Yellow 1, 2 and 3 color index.

  When the laser-welded article 10 is required to have fastness such as weather resistance, heat resistance and bleed resistance, a salt forming dye in which an acid dye and an organic amine are combined is preferably used as the oil-soluble dye mentioned above. It can be used. Such salt-forming dyes can be represented as [anionic / organic ammonium salt of acid dyes]. The fastness of the colorant can be improved by replacing the anthraquinone dye with a salt-forming dye in the colorant and using an anthraquinone salt-forming dye represented as [anionic / organic ammonium salt of anthraquinone acid dye]. .

As an anthraquinone acid dye used for salt forming dyes, specifically, for example,
C. I. Acid Blue 25, 27, 40, 41, 43, 45, 47, 51, 53, 55, 56, 62, 78, 111, 124, 129, 215, 230, and 277;
C. I. Acid Green 37;
C. I. Acid Violet 36, 41, 43, 51, and 63 are commercially available under the color index, and include anthraquinone dyes having one sulfonic acid group in one molecule.

As the anthraquinone acid dye, in addition to the above, specifically, for example,
C. I. Acid Blue 23, 35, 49, 68, 69, 80, 96, 129: 1, 138, 145, 175, 221, and 344;
C. I. Acid Green 25, 27, 36, 38, 41, 42 and 44;
C. I. Acid Violet 34 and 42 are commercially available under the Color Index, and include anthraquinone dyes having two sulfonic acid groups in one molecule of anthraquinone.

  Among them, C.I. I. Acid Blue 49, 80, 96, 129: 1, 138, 145, and 221, C.I. I. Acid Green 25, 27, 36, 38, 41, 42 and 44, and C.I. I. Like Acid Violet 34, one having a structure in which a substituent having a sulfonic acid group is bonded to an anilino group as at least one substituent in an anthraquinone skeleton is preferable.

Suitable anthraquinone salt-forming dyes include anthraquinone salt-forming dyes having an anilino group derivative as a substituent. Such anthraquinone salt-forming dyes are A ^- B ⁺ (A ^- is an anion derived from anthraquinone, B ⁺ is a cation derived from organic ammonium) or AB (A is a dehydrogenation residue of anthraquinone skeleton or a substituent bonded to anthraquinone) (Dehydrogenation residue of B) is represented by (dehydrogenation residue of organic ammonium), shows high compatibility with an aromatic thermoplastic resin, and can impart high heat resistance.

（化学式（１）中、Ｘ及びＹは互いに独立して水素原子、水酸基、ハロゲン原子、又はアミノ基であり、Ｒ^１〜Ｒ^５は互いに独立して水素原子、水酸基、アミノ基、ニトロ基、炭素数１〜１８で直鎖若しくは分枝鎖のアルキル基、炭素数１〜１８で直鎖若しくは分枝鎖のアルコキシ基、ハロゲン原子、フェニルオキシ基、カルボキシ基であり、（Ｐ）^ｂ＋は有機アンモニウムイオン、ａ及びｂは１〜２の正数、ｍ及びｎは１〜２の正数であり、Ａは水素原子、水酸基、アミノ基、ハロゲン原子、又は下記化学式（２）

（化学式（２）中、Ｒ^６〜Ｒ^１０は互いに独立して水素原子、水酸基、アミノ基、ニトロ基、炭素数１〜１８で直鎖若しくは分枝鎖のアルキル基、炭素数１〜１８で直鎖若しくは分枝鎖のアルコキシ基、又はハロゲン原子である）である）で表わされる。 Such a preferred anthraquinone salt forming dye has the following chemical formula (1):

(In the chemical formula (1), X and Y are each independently a hydrogen atom, a hydroxyl group, a halogen atom, or an amino group, R ^{1 to} R ⁵ are each independently a hydrogen atom, a hydroxyl group, an amino group, a nitro group, A linear or branched alkyl group having 1 to 18 carbon atoms, a linear or branched alkoxy group having 1 to 18 carbon atoms, a halogen atom, a phenyloxy group, a carboxy group, and (P) ^{b +} is organic Ammonium ion, a and b are 1 to 2 positive numbers, m and n are 1 to 2 positive numbers, A is a hydrogen atom, a hydroxyl group, an amino group, a halogen atom, or the following chemical formula (2)

In the chemical formula (2), R ^{6 to} R ¹⁰ each independently represent a hydrogen atom, a hydroxyl group, an amino group, a nitro group, a linear or branched alkyl group having 1 to 18 carbon atoms, or 1 to 18 carbon atoms A straight or branched alkoxy group, or a halogen atom).

  In the chemical formulas (1) and (2), as a linear or branched alkyl group having 1 to 18 carbon atoms, specifically, for example, methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group Sec-butyl, isobutyl, tert-butyl, n-pentyl, neopentyl, isopentyl, sec-pentyl, 3-pentyl, tert-pentyl, hexyl, heptyl and octyl It can be mentioned. Moreover, as a C1-C18 linear or branched C1-C18 alkoxy group, specifically, a methoxy group, an ethoxy group, n-propoxy group, isopropoxy group, n-butoxy group, sec are specifically mentioned. -Butoxy, isobutoxy, tert-butoxy, n-pentyloxy, neopentyloxy, isopentyloxy, sec-pentyloxy, 3-pentyloxy, tert-pentyloxy and hexyloxy groups Can be mentioned. Further, specific examples of the halogen atom include fluorine, chlorine, bromine and iodine.

The salt-forming dye represented by the chemical formula (1) is preferably an anthraquinone salt-forming dye having two phenylamino derivatives as a substituent in one molecule. According to this, at the time of molding or laser welding of the respective resin members 1, 2, 3, it is possible to suppress their thermal deterioration due to heat melting. As an anthraquinone acid dye which has two phenylamino derivatives as a substituent in one molecule as suitably used for salt forming dyes, specifically, for example,
C. I. Acid Green 25, 27, 36, 38, 41, 42 and 44;
C. I. Acid Blue 80 and 221;
C. I. Acid Violet 34 is mentioned.

Specific examples of the amines preferably used for the salt forming dye represented by the chemical formula (1) include hexylamine, pentylamine, octylamine, 2-ethylhexylamine, di- (2-ethylhexyl) amine, and dodecylamine Aliphatic amines such as tetramethylenediamine, hexamethylenediamine, octamethylenediamine, nonamethylenediamine, dodecamethylenediamine, 2-methylpentamethylenediamine, 2-methyloctamethylenediamine, trimethylhexamethylenediamine, bis (p- Diamines such as aminocyclohexyl) methane, m-xylenediamine, and p-xylenediamine;
Cycloaliphatic amines such as cyclohexylamine, di-cyclohexylamine and dihydroethylamine; 3-propoxypropylamine, di- (3-ethoxypropyl) amine, 3-butoxypropylamine, octooxypropylamine, and 3 Alkoxyalkylamines such as-(2-ethylhexyloxy) propylamine; such as α-naphthylamine, β-naphthylamine, 1,2-naphthylenediamine, 1,5-naphthylenediamine, and 1,8-naphthylenediamine Naphthylamines; Naphthylalkylamines such as 1-naphthylmethylamine; N-cyclohexylethanolamine, N-dodecylethanolamine, and alkanol group-containing amines such as N-dodecylimino-di-ethanol; 1,3-diphenyl Guanidine derivatives such as guanidine, 1-o-tolyl guanidine and di-o-tolyl guanidine are included.

As amines, commercially available amines or quaternary ammonium salts may be used. As such an amine or quaternary ammonium salt, specifically, for example, Cortamine 24 P, Cortamine 86 P conc, Cortamine 60 W, Cortamine 86 W, Cortamine D 86 P (distearyl dimethyl ammonium chloride), Sanizol C, and Sanizol B-50 (above, Kao Co., Ltd., Cortamine and Sanizole are registered trademarks; ARCARD 210-80E, 2C-75, 2HT-75 (dialkyl (alkyl is C ₁₄ -C ₁₈ ) dimethyl ammonium chloride), 2HT flakes, 2O-75I, 2HP- 75 and 2 HP flakes (all manufactured by Lion Specialty Chemicals Inc., ARCARD is a trade name); PRIMENE MD amine (methane diamine), PRIMIN 81-R (hyperbranched chain tert-) Alkyl _(C 12 _{-C 14)} primary amine isomer mixture), Puraimin TOA amine (tert- octylamine), Puraimin RB-3 (tert- alkyl primary amine mixture), and Puraimin JM-T amine (high branched tert - alkyl _(C 16 _{-C 22)} primary amine isomer mixture) (or, Dow Chemical Co., PRIMENE is a registered trademark) and the like.

  The content of the coloring agent is 0.01 to 2 parts by mass, preferably 0.05 to 0.8 parts by mass, more preferably 0.1 to 0.5 parts by mass with respect to 100 parts by mass of the thermoplastic resin. It is. By adjusting the content of the coloring agent to such a range, the resin composition for the first laser light transmitting and absorbing resin member, the resin composition for the second laser light transmitting and absorbing resin member, and the laser having high color forming property, and the laser The resin composition for light transmissive resin members can be obtained.

  When preparing these resin compositions, it is preferable to prepare a masterbatch containing a coloring agent, and to add this masterbatch to a thermoplastic resin composition. According to this, since the coloring agent is uniformly dispersed, no color unevenness occurs in these resin compositions. The content of the colorant in the masterbatch is preferably 5 to 90% by mass, and more preferably 20 to 60% by mass.

  The resin composition for a laser ray transmitting resin member is non-containing of a laser absorber such as nigrosine sulfate, or the content of the resin composition is small, so that the laser ray transmitting resin member 3 is achromatic only. Instead, it can be a colored member of a chromatic color. For example, the laser ray transmitting resin member 3 can be colored in yellow, red, blue, green or purple using the coloring agent exemplified above.

  In addition to the coloring agent, various additives may be added to the thermoplastic resin raw material, if necessary, in these resin compositions. Such additives include, for example, reinforcing materials, fillers, ultraviolet light absorbers or light stabilizers, antioxidants, antibacterial and antifungal agents, flame retardants, mold release agents, crystallization nucleating agents, plasticizers, resistance Impact modifiers, adjuvants, dispersants, stabilizers, modifiers, antistatic agents, lubricants, and crystallization accelerators can be mentioned. Further, white pigments such as titanium oxide, zinc sulfate, zinc white (zinc oxide), calcium carbonate, and alumina white and organic white pigments can be mentioned. According to this, the achromatic thermoplastic resin raw material can be combined with the organic dye to adjust to a chromatic color.

  The reinforcing material is not particularly limited as long as it can be used to reinforce the synthetic resin. For example, inorganic fibers such as glass fiber, carbon fiber, metal fiber, potassium titanate fiber, calcium silicate fiber, sepiolite, wollastonite, and rock wool, and aramid, polyphenylene sulfide resin, polyamide, polyester, and liquid crystal polymer And organic fibers such as For example, when providing transparency to a resin member, glass fiber can be suitably used for the reinforcement. The fiber length of such glass fibers is 2 to 15 mm, and the fiber diameter is 1 to 20 μm. The form of the glass fiber is not particularly limited, and examples thereof include roving and milled fiber. These glass fibers may be used alone or in combination of two or more. The content thereof is preferably 5 to 120 parts by mass with respect to 100 parts by mass of each of the resin members 1 and 2, for example. When the amount is less than 5 parts by mass, a sufficient glass fiber reinforcing effect can not be obtained, and when the amount is more than 120 parts by mass, the formability is reduced. The amount is preferably 10 to 60 parts by mass, particularly preferably 20 to 50 parts by mass.

  Particulate fillers may be mentioned as fillers, for example talc, kaolin, clay, wollastonite, bentonite, asbestos and silicates such as alumina silicate; alumina, silicon oxide, magnesium oxide, zirconium oxide and titanium oxide Metal oxides such as; carbonates such as calcium carbonate, magnesium carbonate and dolomite; sulfates such as calcium sulfate and barium sulfate; ceramics such as glass beads, ceramic beads, boron nitride and silicon carbide Can be mentioned. The filler may also be a plate-like filler such as mica, sericite, and glass flakes.

  As an ultraviolet absorber and a light stabilizer, a benzotriazole type compound, a benzophenone type compound, a salicylate type compound, a cyanoacrylate type compound, a benzoate type compound, an oxalate type compound, a hindered amine type compound, and a nickel complex salt can be mentioned.

  Examples of antioxidants include phenolic antioxidants, phosphorus antioxidants, and sulfur antioxidants and thioether antioxidants.

  The phenolic antioxidant is an antioxidant having a phenolic hydroxyl group. Among them, hindered phenol-based antioxidants are preferably used. The hindered phenolic antioxidant is an antioxidant in which one or two carbon atoms adjacent to a carbon atom of an aromatic ring to which a phenolic hydroxyl group is bonded is substituted by a substituent having 4 or more carbon atoms. is there. The substituent having 4 or more carbon atoms may be bonded to a carbon atom of an aromatic ring via a carbon-carbon bond, or may be bonded via an atom other than carbon.

  A phosphorus antioxidant is an antioxidant which has a phosphorus atom. The phosphorus-based antioxidant is preferably an inorganic phosphate compound such as sodium phosphite and sodium hypophosphite or an organic antioxidant having a P (OR) 3 structure. Here, R represents an alkyl group, an alkylene group, an aryl group, an arylene group or the like, and three Rs may be the same or different, and any two Rs are bonded to each other to form a ring structure May be formed. Examples of phosphorus-based antioxidants include triphenyl phosphite, diphenyl decyl phosphite, phenyl diisodecyl phosphite, tri (nonylphenyl) phosphite, and bis (2,4-di-tert-butylphenyl) pentaerythritol diphosphite And bis (2,6-di-tert-butyl-4-methylphenyl) pentaerythritol diphosphite and the like.

  The sulfur-based antioxidant is an antioxidant having a sulfur atom. For example, didodecyl thiodipropionate, ditetradecyl thiodipropionate, dioctadecyl thiodipropionate, pentaerythritol tetrakis (3-dodecyl thiopropionate), thiobis (N-phenyl-β-naphthylamine), 2- Examples thereof include mercaptobenzothiazole, 2-mercaptobenzoimidazole, tetramethylthiuram monosulfide, tetramethylthiuram disulfide, nickel dibutyl dithiocarbamate, nickel isopropyl xanthate, and trilauryl trithiophosphite. In particular, a thioether antioxidant having a thioether structure can be suitably used because it receives oxygen from an oxidized substance and reduces it.

  2- (4'-thiazolyl) benzimidazole, 10,10'-oxybisphenoxyarsine, N- (fluorodichloromethylthio) phthalimide and bis (2-pyridylthio-1-oxide) zinc as antibacterial and antifungal agents It can be mentioned.

  The flame retardant is not particularly limited, and examples thereof include organic flame retardants such as organic halogen compounds, antimony compounds, silicon-containing compounds, phosphorus compounds, and nitrogen compounds, and inorganic flame retardants.

  As an organic halogen compound, for example, brominated polycarbonate, brominated epoxy resin, brominated phenoxy resin, brominated polyphenylene ether resin, brominated polystyrene resin, brominated bisphenol A, pentabromobenzyl polyacrylate, tetrabromobisphenol A derivative, hexa Bromo diphenyl ether, tetrabromo phthalic anhydride, etc. are mentioned. Examples of the antimony compound include antimony trioxide, antimony pentoxide, sodium antimonate and antimony phosphate. Also included are silicone oils, organosilanes, and silicon containing compounds such as aluminum silicate. As a phosphorus compound, for example, triphenyl phosphate, triphenyl phosphite, phosphoric acid ester, polyphosphoric acid, ammonium polyphosphate, red phosphorus, phenoxy phosphazene having a bond of phosphorus atom and nitrogen atom in the main chain, amino phosphazene etc. Phosphazene compounds and the like can be mentioned. Examples of nitrogen compounds include melamine, cyanuric acid, melamine cyanurate, urea, and guanidine. As an inorganic flame retardant, aluminum hydroxide, magnesium hydroxide, a silicon compound, and a boron compound etc. are mentioned, for example.

  The releasing agent is not particularly limited. For example, montanic acid waxes, metal stearates such as lithium stearate, aluminum stearate and the like, higher fatty acid amides such as ethylene bis stearylamide, and ethylene diamine / stearic acid / sebacic acid polycondensate Etc.

  The crystallization nucleating agent is not particularly limited, and examples thereof include organic nucleating agents such as rosin and inorganic nucleating agents (for example, metal oxides such as silica, alumina, zirconia, titanium oxide, iron oxide, and zinc oxide; calcium carbonate, Metal carbonates such as magnesium carbonate and barium carbonate; plate-like inorganic substances or silicates such as calcium silicate, aluminum silicate and talc; metal carbides such as silicon carbide; metal nitrides such as silicon nitride, boron nitride, tantalum nitride Often used. These crystallization nucleating agents can be used alone or in combination of two or more.

  The plasticizer is not particularly limited. For example, phthalic acid ester (eg, dimethyl phthalate, butyl benzyl phthalate, and diisodecyl phthalate), phosphoric acid ester (eg, tricresyl phosphate and 2-ethylhexyl diphenyl phosphate), sulfone Amide-based plasticizers (for example, n-butylbenzene sulfonamide, p-toluene sulfonamide, etc.) can be mentioned. Furthermore, polyester-based plasticizers, polyhydric alcohol ester-based plasticizers, polyvalent carboxylic acid ester-based plasticizers, bisphenol-based plasticizers, amide-based plasticizers, ester-based plasticizers, amide ester-based plasticizers, glycerin-based plasticizers, And epoxy plasticizers (e.g., epoxy triglycerides composed of alkyl epoxy stearate and soybean oil) and the like can be used.

  As specific examples of such polyester plasticizers, preferably dicarboxylic acids having 2 to 12 carbon atoms, more preferably 2 to 6 carbon atoms, and preferably 2 to 12 carbon atoms, more preferably 2 to 6 carbon atoms The polyester etc. by a dialcohol or its (poly) oxyalkylene adduct can be mentioned. Examples of dicarboxylic acids include succinic acid, adipic acid, sebacic acid, phthalic acid, terephthalic acid and isophthalic acid, and dialcohols such as propylene glycol, 1,3-butanediol, 1,4-butanediol, 1, 6-hexanediol, ethylene glycol, diethylene glycol, triethylene glycol and the like. Further, the hydroxyl group or carboxy group at the polyester end may be esterified with a monocarboxylic acid or monoalcohol to be blocked.

  As specific examples of polyhydric alcohol ester plasticizers, polyhydric alcohols or (poly) oxyalkylene adducts thereof, preferably having 1 to 12 carbon atoms, more preferably 1 to 6 carbon atoms, and still more preferably 1 to 1 carbon atoms Mono, di or tri ester with 4 monocarboxylic acids, etc. may be mentioned. Examples of polyhydric alcohols include polyethylene glycol, polypropylene glycol, glycerin and the above-mentioned dialcohols. Examples of monocarboxylic acids include acetic acid and propionic acid.

  The polyvalent carboxylic acid ester plasticizer is preferably a polyvalent carboxylic acid and preferably a monocarbon having 1 to 12 carbon atoms, more preferably 1 to 6 carbon atoms, still more preferably 1 to 4 carbon atoms or (poly) Mention may be made of mono-, di- or tri-esters with oxyalkylene adducts and the like. Examples of polyvalent carboxylic acids include trimellitic acid and the above-mentioned dicarboxylic acids. As a monoalcohol, methanol, ethanol, 1-propanol, 1-butanol, and 2-ethylhexanol etc. can be mentioned.

  As a bisphenol-based plasticizer, a monoester of bisphenol and a monoalkyl halide having preferably 1 to 18 carbon atoms, more preferably 2 to 14 carbon atoms, and still more preferably 4 to 10 carbon atoms or its (poly) oxyalkylene adduct Or diether and the like. As bisphenol, bisphenol A, bisphenol S, etc. are mentioned. Monoalkyl halides include 1-octyl bromide, 1-dodecyl bromide, and 2-ethylhexyl bromide.

  Examples of amide plasticizers include carboxylic acid amide plasticizers and sulfonamide plasticizers. As a carboxylic acid amide plasticizer, at least one acid selected from the group consisting of benzoic acid, phthalic acid, trimellitic acid, pyromellitic acid and anhydrides thereof, and dialkyls having 2 to 8 carbon atoms in the alkyl group Amides with amines are included. Moreover, a diethylamine, a dipropylamine, a dibutylamine, a dihexylamine, a di 2-ethylhexyl amine, dioctylamine etc. are mentioned as C2-C8 dialkylamine of an alkyl group. The molecular weight of the carboxylic acid amide plasticizer is preferably 250 or more and 2000 or less, more preferably 300 or more and 1500 or less, and still more preferably 350 or more and 1000 or less.

  Examples of ester plasticizers include monoester plasticizers, diester plasticizers, triester plasticizers, and polyester plasticizers. Examples of monoester plasticizers include benzoic acid ester plasticizers and stearic acid ester plasticizers. Benzoic acid comprising benzoic acid and an aliphatic alcohol having 6 to 20 carbon atoms or an alkylene oxide adduct of 2 to 4 carbon atoms of the aliphatic alcohol (additional mole number of alkylene oxide is 10 moles or less) as a benzoic acid ester plasticizer Esters may be mentioned, in particular 2-ethylhexyl p-oxybenzoate and 2-hexyldecyl p-oxybenzoate. Stearic acid consisting of stearic acid and an aliphatic alcohol having 1 to 18 carbon atoms or an alkylene oxide adduct of 2 to 4 carbon atoms of the aliphatic alcohol (additional mole number of alkylene oxide is 10 moles or less) as a stearic acid ester plasticizer Acid esters may be mentioned, in particular methyl stearate, ethyl stearate, butyl stearate and hexyl stearate.

  The impact modifier is not particularly limited as long as it exerts the effect of improving the impact resistance of the resin. For example, publicly known materials such as polyamide based elastomers, polyester based elastomers, styrene based elastomers, polyolefin based elastomers, acrylic based elastomers, polyurethane based elastomers, fluorine based elastomers, silicone based elastomers, and acrylic based core / shell type elastomers may be mentioned. Be Among them, polyester elastomers and styrene elastomers are preferable.

  Polyester-based elastomers are thermoplastic polyesters having rubber properties at normal temperature. Preferably, it is a thermoplastic elastomer mainly composed of a polyester block copolymer, and has a high melting point and high crystallinity aromatic polyester as a hard segment, and an amorphous polyester and an amorphous polyether as a soft segment. Those which are block copolymers are preferred. The content of the soft segment of the polyester elastomer is at least 20 to 95% by mole in all segments. For example, the soft segment content of the block copolymer of polybutylene terephthalate and polytetramethylene glycol (PBT-PTMG copolymer) is 50 to 95 mol%. The preferred soft segment content is 50 to 90 mol%, in particular 60 to 85 mol%. Among them, polyester ether block copolymers, in particular PTMG-PBT copolymers, are preferable because the decrease in transmittance is reduced.

  Further, as the styrene-based elastomer, those comprising a styrene component and an elastomer component and containing 5 to 80% by mass, preferably 10 to 50% by mass, more preferably 15 to 30% by mass of a styrene component can be mentioned. . Examples of the elastomer component at this time include conjugated diene hydrocarbons such as butadiene, isoprene and 1,3-pentadiene. More specifically, a copolymer of styrene and butadiene (SBS), a copolymer of styrene and isoprene (SIS), and the like can be mentioned.

  Each resin member 1, 2, 3 may be manufactured using a masterbatch of a desired colored thermoplastic resin composition. Such masterbatch can be obtained by any method. For example, after mixing the powder and / or pellets of the resin to be the base of the masterbatch and the colorant in a mixer such as a tumbler or super mixer, the mixture is heated and melted by an extruder, a batch kneader or a roll kneader It can be obtained by pelletizing or roughening.

  Molding of each resin member 1, 2, 3 can be performed according to various procedures normally performed. For example, the colored pellets can be molded by a processing machine such as an extruder, an injection molding machine, and a roll mill. Also, transparent thermoplastic resin pellets and / or powder, ground colorant, and various additives as needed are mixed in a suitable mixer, and the resin composition thus obtained is processed by a processor. It may be molded using Also, for example, a colorant may be added to a monomer containing a suitable polymerization catalyst, and the mixture may be polymerized to synthesize a desired resin, which may be shaped in an appropriate manner. As a molding method, for example, molding methods such as injection molding, extrusion molding, compression molding, foam molding, blow molding, vacuum molding, injection blow molding, rotational molding, calendar molding, and solution casting can be adopted. By such molding, each resin member 1, 2, 3 of various shapes can be obtained.

  EXAMPLES Hereinafter, the present invention will be more specifically described by way of examples, but the present invention is not limited to these examples.

(Preparation of Laser-Permeable Black Colorant)
[Colorant A] Anthraquinone blue oil-soluble dye (C.I. Solvent Blue 97): perinone red oil-soluble dye (C.I. Solvent Red 179): anthraquinone yellow oil-soluble dye (C.I. Solvent Yellow 163) = The colorant A was obtained by powder mixing at 5: 3: 2 (mass ratio).
[Colorant B] Anthraquinone blue oil-soluble dye (C.I. Solvent Blue 104): perinone red oil-soluble dye (C.I. Solvent Red 179): anthraquinone yellow oil-soluble dye (C.I. Solvent Yellow 163) = The colorant B was obtained by powder mixing at 4: 3: 3 (mass ratio).
[Colorant C] Anthraquinone Blue Acid Dye (C.I. Acid Blue 80) and a salt forming dye of hexamethylenediamine: Perinone red oil-soluble dye (C.I. Solvent Red 179): Anthraquinone yellow oil-soluble dye (C) A colorant C was obtained by powder mixing at a solvent yellow 163) ratio of 7: 2: 1 (mass ratio).
[Colorant D] Anthraquinone blue acid dye (C.I. Acid Blue 80) and salt forming dye of 2-ethylhexylamine: Perinone red oil-soluble dye (C.I. Solvent Red 179): anthraquinone yellow oil-soluble dye (C.I. Solvent Red 179) The colorant D was obtained by powder mixing at a CI Solvent Yellow 163) of 7: 2: 1 (mass ratio).
[Colorant E] Anthraquinone blue acid dye (C.I. Acid Blue 236) and salt forming dye of 2-ethylhexylamine: Perinone red oil-soluble dye (C.I. Solvent Red 179): anthraquinone yellow oil-soluble dye (C.I. Solvent Red 179) The colorant E was obtained by powder mixing at a CI Solvent Yellow 163) = 6: 3: 1 (mass ratio).
[Colorant F] Anthraquinone blue acid dye (C.I. Acid Blue 236) and a salt forming dye of hexamethylenediamine: Perinone red oil-soluble dye (C.I. Solvent Red 179): anthraquinone yellow oil-soluble dye (C) A colorant F was obtained by powder mixing at a solvent yellow 163) = 5: 3: 2 (mass ratio).

Example 1-1
(1) Preparation of first laser light transmitting and absorbing resin member and second laser light transmitting and absorbing resin member 496.90 g of polyamide (PA) 66 resin (manufactured by Asahi Kasei Corporation, trade name: Leona (registered trademark) 1300 S) And 3.0 g of coloring agent A, and nigrosine sulfate which is synthesized by changing the concentration of sulfuric acid according to the description of Nigrosine A (Japanese Patent No. 3757081; sulfate ion of 1.96 mass%; volume resistivity 2.0 × 10 0.1 Ω of ¹⁰ Ω · cm; C. I. Solvent Black 5; aniline concentration is 0.03% by mass) is added to a stainless steel tumbler, and mixed by stirring for 1 hour, and the first and second laser light transmission absorptions Resin composition for a flexible resin member was obtained. The obtained resin composition for the first and second laser light transmitting and absorbing resin members is put into an injection molding machine (made by Toyo Machine Metals Co., Ltd., trade name: Si-50), cylinder temperature 270 ° C., gold The first laser beam transmitting and absorbing resin member 1 and the second laser beam transmitting and absorbing resin member 2 are each formed by a conventional method at a mold temperature of 60 ° C., 80 mm long × 50 mm wide × 1 mm thick and rectangular plate shape One sheet was made.

（数式（１）中、Ｔは真の透過率であり、（Ｉ_Ｏ）は入射光強度であり、（Ｉ_Ｔ）は透過光強度であり、（Ｉ_Ｒ）は反射光強度である）で表される。ここで、入射光強度Ｉ_Ｏを１００％とし、更に透過光強度Ｉ_Ｔ及び反射光強度Ｉ_Ｒに、測定値の百分率である透過率、反射率を夫々代入することにより、吸光度を算出した。なお、本発明のレーザー溶着体を構成するレーザー光弱吸収性樹脂部材は、レーザー光吸収剤を多くに含んでいることがあるので、吸光度及び吸光係数を測定によって求めることが困難な場合がある。またＬａｍｂｅｒｔ−Ｂｅｅｒの法則によれば、吸光度ａはレーザー光吸収剤含有率Ｃ（質量％）と樹脂部材の厚さＬ（ｍｍ）との関係式である下記数式（２）

（数式（２）中、εは吸光係数（１／ｍｍ）であり、Ｃはレーザー光吸収剤含有率（質量％）であり、Ｌは樹脂部材の厚さ（ｍｍ）である）で表される。そこで、表１に示すようにレーザー光吸収剤の含有量が異なるサンプルの透過率及び吸光度を求めた。その結果を表２に示した。これに基いて検量線を作成した。この検量線からこれら樹脂部材の吸光度及び吸光係数について、サンプルの樹脂部材の厚さで除して樹脂部材１ｍｍ当たりの値を算出した。このようにして実施例１−１におけるレーザー光透過吸収性樹脂部材１，２の吸光度ａ_１，ａ_２を求めた。 (Transmittance and absorbance)
The transmittance | permeability of the shaping | molding board of a laser beam permeation | transmission absorption resin member, and a reflectance were measured using the spectrophotometer (The JASCO Corporation make, brand name: V-570). Absorbance (Absorbance) is obtained by taking the logarithm of transmittance as a positive number. In the case of the present invention, since the laser beam is reflected on the surface of the molding plate, it is necessary to determine the true transmittance. The true transmittance T is represented by T = I _T / (I ₀ −I _R ). The Lambert-Beer's law showing an absorbance at 940 nm is given by the following formula (1)

(In equation (1), T is the true transmittance, (I _O ) is the incident light intensity, (I _T is the transmitted light intensity, and (I _R ) is the reflected light intensity) expressed. Here, the incident light intensity I _O is 100%, the more the transmitted light intensity I _T and the reflected light intensity I _R, the percentage in which transmittance measurements, by substituting each reflectivity was calculated absorbance. In addition, since the weakly laser-absorptive resin member constituting the laser-welded body of the present invention may contain a large amount of the laser-light absorbent, it may be difficult to obtain the absorbance and the absorption coefficient by measurement. . Further, according to Lambert-Beer's law, the absorbance a is a relational expression between the laser light absorbent content C (mass%) and the thickness L (mm) of the resin member.

(In the formula (2), ε is an absorption coefficient (1 / mm), C is a laser light absorbent content rate (mass%), L is represented by a thickness (mm) of a resin member) Ru. Therefore, as shown in Table 1, the transmittance and the absorbance of the samples having different contents of the laser light absorbent were determined. The results are shown in Table 2. A calibration curve was created based on this. From the calibration curve, the absorbance and the absorption coefficient of these resin members were divided by the thickness of the resin member of the sample to calculate the value per 1 mm of the resin member. Thus, the absorbances a ₁ and a ₂ of the laser ray transmitting and absorbing resin members 1 and 2 in Example 1-1 were determined.

  A graph is created with the obtained absorbance a as the vertical axis and the laser light absorber (nigrosine A) content C (mass%) as the horizontal axis, and a calibration curve represented by the absorbance a = 4.538 C + 0.058 is obtained. The Using the formula of this calibration curve, the absorbance calculated from the laser light absorbent content rate (mass%) is divided by the thickness of the resin member to obtain the absorbance a mm of the resin member containing the laser light absorbent per a thickness a And the extinction coefficient was determined.

(Melt flow rate)
The laser light transmitting and absorbing resin member 1 was cut into a predetermined size and dried at 80 ° C. for 15 hours to prepare a measurement sample. Melt indexer F-F01 (trade name, manufactured by Toyo Seiki Seisakusho Co., Ltd.) according to JIS K 7210: 2014 (Plastics-How to determine melt mass flow rate (MFR) and melt volume flow rate (MVR) of thermoplastics) The test was performed under the conditions of a test temperature of 280 ° C. and a test load of 2.16 kgf. The measurement was performed three times, and the average of those values was calculated to determine the melt flow rate.

(2) Preparation of Laser Welded Body As shown in FIG. 1, the first laser light transmitting and absorbing resin member 1 and the second laser light transmitting and absorbing resin member 2 are overlapped to form a contact portion N, and Laser light L from a diode laser [wavelength: 940 nm continuous] (made by Hamamatsu Photonics Co., Ltd.) with a power of 200 W, substantially perpendicular to the surface of the laser light transmitting / absorbing resin member 1 from above The light was irradiated while being scanned at a scanning speed of 40 mm / sec and a scanning distance of 20 mm so as to cross linearly from one of the long sides. Thereby, welding was carried out at the contact portion N, and the laser-welded body 10 of Example 1-1 in which both the laser light transmitting and absorbing resin members 1 and 2 were integrated was obtained. The following evaluation was performed about this laser welding body 10.

(Tensile test)
Both laser light transmitting and absorbing resin members 1 of the laser-welded body 10 using a tensile tester (trade name: AG-50 kNE, manufactured by Shimadzu Corporation) according to the test method of JIS K7161 (1994) plastic-tensile characteristics , 2 horizontally in the longitudinal direction in the direction in which they separate from each other at a test speed of 10 mm / min, and the tensile strength as the welding strength was measured. The results are shown in Table 2.

(Evaluation of welding condition)
The welding state was evaluated as follows. The results are shown in Table 2.
Good: The tensile test result of the laser-welded article is 400N or more.
Poor: The tensile test result of the laser-welded article was less than 400N.

(Example 1-2)
The first laser light transmission and absorption was performed in the same manner as in Example 1-1 except that the amount of the polyamide (PA) 66 resin, the amount of nigrosine, and the type and amount of the coloring agent were changed as shown in Table 1. Resin member 1 and the second laser light transmitting and absorbing resin member 2 were produced. The melt flow rate, the transmittance, and the absorbance of both of the laser ray transmitting and absorbing resin members 1 and 2 were measured in the same manner as in Example 1-1. Moreover, it operated similarly to Example 1-1 using both laser beam transparent absorptive resin members 1 and 2, and produced the laser welding body 10 of Example 1-2. Further, with respect to this laser-welded article 10, the tensile test and the evaluation of the welding state were performed in the same manner as in Example 1-1. The results are shown in Table 2.

(Example 1-3)
(1) Preparation of first laser light transmitting and absorbing resin member 499.85 g of polyamide (PA) 66 resin (manufactured by Asahi Kasei Corporation, trade name: Leona (registered trademark) 1300 S), Nigrosine C (Japanese Patent No. 3757081) Sulfate of nigrosine synthesized by changing the concentration of sulfuric acid according to the description; sulfate ion 0.70% by mass; volume resistivity 0.9 × 10 ¹⁰ Ω · cm; CI Solvent Black 5; aniline concentration 0.05 mass %) Was put into a stainless steel tumbler and mixed by stirring for 1 hour to obtain a first laser ray transmitting and absorbing resin member resin composition. The obtained resin composition for the first laser light transmitting and absorbing resin member is put into an injection molding machine, and molded by a usual method at a cylinder temperature of 270 ° C. and a mold temperature of 60 ° C. X One rectangular plate-shaped first laser beam transmitting and absorbing resin member 1 having a thickness of 1 mm was produced.

(2) Preparation of second laser light transmitting and absorbing resin member 499.85 g of polyamide (PA) 66 resin (manufactured by Asahi Kasei Corporation, trade name: Leona (registered trademark) 1300 S) and 0.15 g of nigrosine C The mixture was placed in a stainless steel tumbler and mixed for 1 hour with stirring to obtain a second laser light transmitting and absorbing resin member resin composition. The obtained resin composition for the second laser light transmitting and absorbing resin member is put into an injection molding machine, and molded by a usual method at a cylinder temperature of 270 ° C. and a mold temperature of 60 ° C. X One rectangular plate-shaped second laser light transmitting and absorbing resin member 2 having a thickness of 1 mm was produced.

  The melt flow rate, the transmittance, and the absorbance of the first laser light transmitting and absorbing resin member 1 and the second laser light transmitting and absorbing resin member 2 were measured in the same manner as in Example 1-1. The results are shown in Table 2.

(3) Preparation of Laser Welded Body Using the first laser light transmitting and absorbing resin member 1 and the second laser light transmitting and absorbing resin member described above, the laser welding of Example 3 is performed in the same manner as in Example 1-1. I got a body 10. About this laser welding body 10, it operated similarly to Example 1-1, and the measurement of tensile strength and evaluation of the welding state were performed. The results are shown in Table 2.

(Examples 1-4 to 1-6)
Example 1-1 The procedure of Example 1-1 was repeated except that the amount of polyamide (PA) 66 resin, the type and amount of nigrosine, and the type and amount of colorant were changed as shown in Table 1. The 1st laser beam transparent absorptive resin member 1 and the 2nd laser beam transparent absorptive resin member 2 which are used when producing the -4 to 1-6 laser-welded body were produced. Nigrosine B used in Example 1-5 has a sulfate ion content of 1.52% by mass, a volume resistivity of 2.7 × 10 ¹⁰ Ω · cm, and an aniline concentration of 0.01% by mass. is there. The melt flow rate, the transmittance, and the absorbance of both of the laser ray transmitting and absorbing resin members 1 and 2 were measured in the same manner as in Example 1-1. Moreover, it operated similarly to Example 1-1 using both laser beam transparent absorptive resin members 1 and 2, and produced the laser welding body 10 of Examples 1-4 to 1-6. Further, with respect to these laser-welded bodies 10, a tensile test and evaluation of welding state were performed in the same manner as in Example 1-1. The results are shown in Table 2.

(Comparative Example 1-1)
Nigrosine base (Orient Chemical Industry Co., Ltd., trade name: NUBIAN (registered trademark) BLACK PA-9801, C. I. Solvent Black 7) in place of nigrosine A (nigrosin sulfate) used in Example 1-1 The first laser ray transmitting and absorbing resin member and the second laser ray transmitting and absorbing resin are prepared in the same manner as in Example 1-1 except that 0.10 g of is used. One member each was produced. The melt flow rate, the transmittance, and the absorbance of these resin members were measured in the same manner as in Example 1-1. Moreover, it operated similarly to Example 1-1 using these resin members, and produced the laser welding body of Comparative Example 1-1. About this laser welding body, it operated similarly to Example 1-1, and measurement of tensile strength and evaluation of the welding state were performed. The results are shown in Table 2.

(Comparative example 1-2)
Instead of nigrosine C (nigrosine sulfate) used in Example 1-3, nigrosine hydrochloride (Orient Chemical Industry Co., Ltd., trade name: NUBIAN (registered trademark) BLACK NH-805, C. I. Solvent Black 5) The first laser beam of 80 mm long × 50 mm wide × 1 mm thick is operated in the same manner as in Example 1-1 except that 0.15 g of volume resistivity 8.0 × 10 ⁸ Ω · cm) is used. One transmission absorptive resin member and one second laser light transmission absorptive resin member were produced. The melt flow rate, the transmittance, and the absorbance of these resin members were measured in the same manner as in Example 1-1. Moreover, it operated similarly to Example 1-1 using these resin members, and produced the laser welding body of Comparative Example 1-2. The measurement of the tensile strength and the evaluation of the welding state were carried out for this laser-welded body. The results are shown in Table 2.

(Comparative example 1-3)
0.2 g of nigrosine base (Orient Chemical Industry Co., Ltd. trade name: NUBIAN (registered trademark) BLACK PA-9803, CI Solvent Black 7, nigrosine base) instead of nigrosine A (sulfate of nigrosine) The first laser ray transmitting and absorbing resin member and the second laser ray transmitting and absorbing resin member each having a length of 80 mm × 50 mm × a thickness of 1 mm are operated in the same manner as in Example 1-4 except that A piece was made. The melt flow rate, the transmittance, and the absorbance of these resin members were measured in the same manner as in Example 1-1. Moreover, it operated similarly to Example 1-1 using these resin members, and produced the laser welding body of Comparative Example 1-3. The measurement of the tensile strength and the evaluation of the welding state were carried out for this laser-welded body. The results are shown in Table 2.

  As can be seen from Table 1, the laser-welded articles of Examples 1-1 to 1-6 using the resin member containing nigrosine sulfate as the laser light absorber were compared using the resin member containing nigrosine hydrochloride. Compared to the laser weldment of the example, it showed high tensile strength, ie high weld strength. In addition, under the irradiation conditions of high power of 200 W and high scanning speed of 40 mm / sec, no welding marks are observed in the laser welds of Examples 1-1 to 1-6, and these laser welds Showed a good welding state and could be manufactured with high efficiency.

(Example 2-1)
(1) Preparation of first laser light transmitting and absorbing resin member and second laser light transmitting and absorbing resin member 497.90 g of polyamide (PA) 66 resin (manufactured by Asahi Kasei Corporation, trade name: Leona (registered trademark) 1300 S) , 2.0 g of coloring agent A and 0.10 g of nigrosine A are put into a stainless steel tumbler and mixed by stirring for 1 hour to obtain resin compositions for first and second laser beam transmitting and absorbing resin members The The obtained resin composition for the first and second laser light transmitting and absorbing resin members is put into an injection molding machine, and molded by a usual method at a cylinder temperature of 270 ° C. and a mold temperature of 60 ° C. X A rectangular plate-shaped first laser beam transmitting and absorbing resin member 1 and a second laser beam transmitting and absorbing resin member 2 each having a width of 50 mm and a thickness of 1 mm were produced.

  The melt flow rate, the transmittance, and the absorbance of the first laser light transmitting and absorbing resin member 1 and the second laser light transmitting and absorbing resin member were measured in the same manner as in Example 1-1. The results are shown in Table 3.

(2) Preparation of Laser Welded Body As shown in FIG. 2A, the end portions of the first laser light transmitting and absorbing resin member 1 and the second laser light transmitting and absorbing resin member 2 are butted to each other at the butt portion B. Laser light L from a diode laser [wavelength: 940 nm continuous] (made by Hamamatsu Photonics K. K.) with a scanning speed of 40 mm / sec, and a scanning distance, substantially perpendicularly to the butt area B. The irradiation was performed while scanning along the abutting portion B at 20 mm. As a result, welding was performed at the butt portion B, and a laser-welded body 10 of Example 2-1 in which both the laser light transmitting and absorbing resin members 1 and 2 were integrated was obtained. The operation of this laser-welded body 10 is the same as in Example 1-1 except that the first laser light transmitting and absorbing resin member 1 and the second laser light transmitting and absorbing resin member 2 are pulled horizontally in the separating direction. The tensile strength was measured. The welding mode was also evaluated in the same manner as in Example 1-1. The results are shown in Table 3.

(Examples 2-2 to 2-5)
Example 2 was carried out in the same manner as Example 2-1 except that the amount of polyamide (PA) 66 resin, the type and amount of nigrosine, and the type and amount of colorant were changed as shown in Table 2. The 1st laser beam transmission and absorption resin member 1 and the 2nd laser beam transmission and absorption resin member 2 which are used when producing a laser weldment of -2-2-5 were produced. The melt flow rate, the transmittance, and the absorbance of both of the laser ray transmitting and absorbing resin members 1 and 2 were measured in the same manner as in Example 1-1. The laser-welded article 10 of each of Examples 2-2 to 2-5 was manufactured in the same manner as in Example 1-1, using both of the laser light transmitting and absorbing resin members 1 and 2. Further, with respect to these laser-welded bodies 10, a tensile test and evaluation of welding state were performed in the same manner as in Example 1-1. The results are shown in Table 3.

(Comparative example 2-1)
The amount of polyamide (PA) 66 resin is 497.90 g, and nigrosine hydrochloride (Orient Chemical Industry Co., Ltd., trade name: NUBIAN (registered trademark) BLACK NH-) in place of nigrosine A (nigrosine sulfate) Operating similarly to Example 2-1 except using 805, 0.10 g of CI Solvent Black 5 (hydrochloride of nigrosine), a first laser of 80 mm long × 50 mm wide × 1 mm thick One light transmitting and absorbing resin member and one second laser light transmitting and absorbing resin member were produced. The melt flow rate, the transmittance, and the absorbance of these resin members were measured in the same manner as in Example 1-1. Moreover, it operated similarly to Example 2-1 using these resin members, and produced the laser welding body of Comparative Example 2-1. About this laser welding body, it operated similarly to Example 1-1, and measurement of tensile strength and evaluation of the welding state were performed. The results are shown in Table 3.

(Comparative Example 2-2)
The amount of polyamide (PA) 66 resin is 497.85 g, and nigrosine hydrochloride (Orient Chemical Industry Co., Ltd., trade name: NUBIAN (registered trademark) BLACK NH-) in place of nigrosine A (nigrosine sulfate) Operating similarly to Example 2-2 except using 805, 0.15 g of C.I. Solvent Black 5, Nigrosine hydrochloride), the first laser of 80 mm long × 50 mm wide × 1 mm thick One light transmitting and absorbing resin member and one second laser light transmitting and absorbing resin member were produced. The melt flow rate, the transmittance, and the absorbance of these resin members were measured in the same manner as in Example 1-1. Moreover, it operated similarly to Example 2-1 using these resin members, and produced the laser welding body of Comparative Example 2-2. About this laser welding body, it operated similarly to Example 1-1, and measurement of tensile strength and evaluation of the welding state were performed. The results are shown in Table 3.

  As can be seen from Table 2, the laser-welded articles of Examples 2-1 to 2-5 using a resin member containing nigrosine sulfate as a laser light absorber are comparative examples using a resin member containing nigrosine hydrochloride. As compared with the laser-welded body of the above, it showed a high tensile strength, that is, a high welding strength, and no welding marks, indicating a good welding state.

Example 3-1
(1) Preparation of first laser light transmitting and absorbing resin member and second laser light transmitting and absorbing resin member 499.9 g of polyamide (PA) 66 resin (manufactured by Asahi Kasei Corporation, trade name: Leona (registered trademark) 1300 S) And 0.1 g of nigrosine A were placed in a stainless steel tumbler and mixed for 1 hour with stirring to obtain a first laser ray transmitting and absorbing resin member resin composition. Furthermore, 499.85 g of polyamide (PA) 66 resin (manufactured by Asahi Kasei Corp., trade name: Leona (registered trademark) 1300 S) and 0.15 g of nigrosine A are put into a stainless steel tumbler and mixed by stirring for 1 hour. A resin composition for a second laser light transmitting and absorbing resin member was obtained. The obtained resin composition for the first and second laser light transmitting and absorbing resin members is put into an injection molding machine, and molded by a usual method at a cylinder temperature of 270 ° C. and a mold temperature of 60 ° C. X A rectangular plate-shaped first laser beam transmitting and absorbing resin member 1 and a second laser beam transmitting and absorbing resin member 2 each having a width of 50 mm and a thickness of 1 mm were produced. The transmittances and absorbances of the two laser light transmitting and absorbing resin members 1 and 2 were measured in the same manner as in Example 1-1. The results are shown in Table 3.

(2) Preparation of Laser Welded Body By sandwiching a gap gauge between the first laser light transmitting and absorbing resin member 1 and the second laser light transmitting and absorbing resin member 2, as shown in FIG. A contact portion having a gap of at most 2000 μm was formed between the 1 laser light transmitting and absorbing resin member 1 and the second laser light transmitting and absorbing resin member 2. A laser beam L from a diode laser (wavelength: 940 nm continuous) having a power of 200 W is generally straight from the top of the first laser light transmitting / absorbing resin member 1 from the top of one of the long sides thereof. The light was irradiated while being scanned at a scanning speed of 40 mm / sec and a scanning distance of 20 mm so as to cross the. Thereby, welding was carried out at the contact portion N, and the laser-welded body 10 of Example 3-1 in which both the laser light transmitting and absorbing resin members 1 and 2 were integrated was obtained. About this laser welding body 10, it operated similarly to Example 1-1, and the measurement of tensile strength and evaluation of the welding state were performed. The results are shown in Table 4.

(Example 3-2)
(1) Preparation of first laser light transmitting and absorbing resin member and second laser light transmitting and absorbing resin member 497.85 g of polyamide (PA) 66 resin (manufactured by Asahi Kasei Corporation, trade name: Leona (registered trademark) 1300 S) , 2.0 g of coloring agent D, and 0.15 g of nigrosine A are placed in a stainless steel tumbler and mixed by stirring for 1 hour to obtain resin compositions for first and second laser light transmitting and absorbing resin members The The obtained resin composition for the first and second laser light transmitting and absorbing resin members is put into an injection molding machine, and molded by a usual method at a cylinder temperature of 270 ° C. and a mold temperature of 60 ° C. X A rectangular plate-shaped first laser beam transmitting and absorbing resin member 1 and a second laser beam transmitting and absorbing resin member 2 each having a width of 50 mm and a thickness of 1 mm were produced. The transmittances and absorbances of the two laser light transmitting and absorbing resin members 1 and 2 were measured in the same manner as in Example 1-1. The results are shown in Table 4.

(2) Preparation of Laser Welded Body Using the first laser light transmitting and absorbing resin member 1 and the second laser light transmitting and absorbing resin member 2 manufactured in the same manner as in Example 3-1, Example 3- A laser weldment 2 of 2 was obtained. About this laser welding body 10, it operated similarly to Example 1-1, and the measurement of tensile strength and evaluation of the welding state were performed. The results are shown in Table 4.

(Comparative example 3)
A laser ray transmitting resin member was operated in the same manner as in Example 3-1 except that 500.0 g of polyamide (PA) 66 resin (manufactured by Asahi Kasei Corp., trade name: Leona (registered trademark) 1300 S) was used. Was made. Moreover, it is the same as that of Example 3-1 except using 496.0 g of polyamide (PA) 66 resin (made by Asahi Kasei Co., Ltd., trade name: Leona (registered trademark) 1300 S) and 4.0 g of nigrosine A. The operation was carried out to produce one laser light absorbing resin member. The transmittance and absorbance of these resin members were measured in the same manner as in Example 1-1. Moreover, although the laser beam was irradiated similarly to Example 3-1 using these resin members, resin members did not weld and it was not able to obtain a laser welding body.

  As can be seen from Table 4, the laser welds of Examples 3-1 and 3-2 using a resin member containing a sulfate of nigrosine as a laser light absorber exhibit high tensile strength, that is, high weld strength, and There were no welding marks, indicating a good welding state. It is considered that this is because heat generation and melting occur not only in the second laser light transmitting and absorbing resin member 2 but also in the first laser light transmitting and absorbing resin member 1 by the laser light irradiation. Thus, according to the present invention, it is possible to obtain a laser-welded body firmly welded even when there is a gap between resin members. As a result, it is possible to cope with sink marks and surface irregularities generated in the process of molding the resin member, and laser welding can be performed stably. On the other hand, in the comparative example in which the laser light transmitting resin member and the laser light absorbing resin member were combined, the resin members were not welded to each other. This is considered that the heat generation and melting generated only in the laser light absorbing resin member by the irradiation of the laser light did not conduct to the laser light transmitting resin member so that the resin members could be welded together and did not spread. Be

Example 4-1
(1) Preparation of first laser light transmitting and absorbing resin member and second laser light transmitting and absorbing resin member 499.85 g of polyamide (PA) 66 resin (manufactured by Asahi Kasei Corporation, trade name: Leona (registered trademark) 1300 S) And 0.15 g of nigrosine A were placed in a stainless steel tumbler and mixed by stirring for 1 hour to obtain resin compositions for the first and second laser light transmitting and absorbing resin members. The obtained resin composition for the first and second laser light transmitting and absorbing resin members is put into an injection molding machine, and molded by a usual method at a cylinder temperature of 270 ° C. and a mold temperature of 60 ° C. × 50 mm × 1 mm thickness, rectangular plate-shaped first laser light transmitting and absorbing resin member 1 and second laser light transmitting and absorbing resin member 2, second laser light transmitting and absorbing resin member piece 2 a and second laser One light transmitting and absorbing resin member piece 2 b was produced. The transmittance and the absorbance of these resin members were measured in the same manner as in Example 1-1. As a result, the absorbances a ₁ , a _2-1 and a _2-2 were 0.18, and the transmittance was 61.8%.

(2) Preparation of Laser Welded Body As shown in FIG. 2C, the end portions of the second laser light transmitting and absorbing resin member pieces 2a and 2b are butted and brought into contact with each other to form a butt portion B. The first laser beam transmitting and absorbing resin member 1 is superimposed on the second laser beam transmitting and absorbing resin member pieces 2 a and 2 b so as to cover the butt portion B, and the first laser beam transmitting and absorbing resin member 1 and the second laser beam The contact portion N _1-2a , which is the contact surface with the transmitting / absorbing resin member piece 2a, and the contact surface between the first laser beam transmitting / absorbing resin member 1 and the second laser beam transmitting / absorbing resin member piece 2b The contact portion N _{1-2 b} was formed. From the top of the first laser light transmitting / absorbing resin member 1 toward the butt portion B substantially perpendicularly to the surface, the laser light L from the diode laser (wavelength: 940 nm continuous) having a power of 200 W is a butt portion It irradiated, making it scan with a scanning speed of 40 mm / sec and a scanning distance of 20 mm in a straight line along B. As a result, welding is _performed at the contact portion B and the contact portions N _1-2b and N _1-2a , and the laser-welded body 10 of Example 4-1 is obtained in which both the laser light transmitting and absorbing resin members 1 and 2 are integrated. The The laser welded body 10 is the same as Example 1-1 except that the second laser beam transmitting / absorbing resin member piece 2a and the second laser beam transmitting / absorbing resin member piece 2b are pulled horizontally in the separating direction. The measurement of the tensile strength was performed. The welding mode was also evaluated in the same manner as in Example 1-1. The tensile strength was 711 N and the welding condition was good.

(Example 4-2)
(1) Preparation of first laser light transmitting and absorbing resin member and second laser light transmitting and absorbing resin member 499.85 g of polyamide (PA) 66 resin (manufactured by Asahi Kasei Corporation, trade name: Leona (registered trademark) 1300 S) And 0.15 g of nigrosine A were placed in a stainless steel tumbler and mixed by stirring for 1 hour to obtain resin compositions for the first and second laser light transmitting and absorbing resin members. The obtained resin composition for the first and second laser light transmitting and absorbing resin members is put into an injection molding machine, and molded by a usual method at a cylinder temperature of 270 ° C. and a mold temperature of 60 ° C. X 50 mm in width x 1 mm in thickness, the first laser light transmitting and absorbing resin member piece 1a which is a rectangular plate-shaped first laser light transmitting and absorbing resin member 1 and the first laser light transmitting and absorbing resin member piece 1b and the second One laser light transmitting and absorbing resin member 2 was produced. The transmittance and the absorbance of these resin members were measured in the same manner as in Example 1-1. As a result, the absorbances a _1-1 , a _1-2 and a ₂ were 0.18, and the transmittance was 61.8%.

(2) Preparation of Laser Welded Body As shown in FIG. 2 (b), end portions of the first laser beam transmitting and absorbing resin member pieces 1a and 1b were butted to form a butt portion B. The second laser beam transmitting and absorbing resin member 2 is stacked on the first laser beam transmitting and absorbing resin member pieces 1a and 1b so as to overlap with the butt portion B, and the first laser beam transmitting and absorbing resin member piece 1a and the second laser The contact portion N _1a-2 which is the contact surface with the light transmitting and absorbing resin member 2, and the contact surface between the first laser light transmitting and absorbing resin member piece 1 b and the second laser light transmitting and absorbing resin member 2 The contact portion _N1b-2 was formed. A laser beam L from a diode laser (wavelength: 940 nm continuous) from the top of the first laser light transmitting / absorbing resin member 1 substantially perpendicularly to the butt joint part B, along the butt joint portion B, is scanned in a straight line The irradiation was performed while scanning at a speed of 40 mm / sec and a scanning distance of 20 mm. As a result, welding was performed at the butt portion B and the contact portions N _1a -2 and N _1b -2, and the laser-welded body 10 of Example 4-2 in which both laser light transmitting and absorbing resin members 1 and 2 were integrated was obtained. . The laser welded body 10 is the same as Example 1-1 except that the first laser light transmitting and absorbing resin member piece 1a and the first laser light transmitting and absorbing resin member piece 1b are pulled horizontally in the separating direction. The measurement of the tensile strength was performed. Moreover, evaluation of the welding state was performed like Example 1-1. The tensile strength was 698 N and the welding condition was good.

(Example 5)
(1) Preparation of Laser Transmissive Resin Member 500.0 g of polyamide (PA) 66 resin (manufactured by Asahi Kasei Corporation, trade name: Leona (registered trademark) 1300 S) is put into a stainless steel tumbler and mixed by stirring for 1 hour The resin composition for a laser ray transmitting resin member was obtained. The obtained resin composition for a laser ray transmitting resin member is put into an injection molding machine, and molded by a usual method at a cylinder temperature of 270 ° C. and a mold temperature of 60 ° C. to measure 80 mm × 50 mm × thickness It had a rectangular plate shape of 1 mm, and one laser light transmitting resin member 3 as a laser light irradiated resin member was produced. The transmittance and the absorbance of the laser light transmitting resin member 3 were measured in the same manner as in Example 1-1. As a result, the absorbance b was 0.05, and the transmittance was 80.3%.

(2) Preparation of First Laser Light Transmitting / Resorbing Resin Member and Second Laser Light Transmission / Absorbing Resin Member The first laser is operated in the same manner as the preparation of the first laser light transmitting / absorbing resin member in Example 3-1. The light transmission and absorption resin member 1 and the second laser light transmission and absorption resin member 2 were produced. The transmittance and absorbance of both laser light transmitting and absorbing resin members 1 and 2 were measured in the same manner as in Example 1-1. As a result, the absorbances a ₁ and a ₂ were 0.12 and the transmittance was 68.6%.

(3) Preparation of Laser Welded Body As shown in FIG. 3A, a laser ray transmitting resin member 3 which is a laser ray irradiated resin member, a first laser ray transmitting / absorbing resin member 1, and a second laser light The upper absorbing portion N ₁ , which is the contact surface between the laser light transmitting resin member 3 and the first laser light transmitting and absorbing resin member ₁ , and the first laser light transmission A lower side contact portion N2 which is a contact surface between the absorptive resin member 1 and the second laser light transmitting and absorbing resin member ₂ was formed. A laser beam L is crossed in a straight line from one of the long sides from a diode laser (wavelength: 940 nm continuous) having a power of 200 W substantially perpendicular to the surface of the laser light transmitting resin member 3 from above. Thus, irradiation was performed while scanning at a scanning speed of 40 mm / sec and a scanning distance of 20 mm. Thereby, welding is performed at the contact portion N, and laser welding of Example 5 in which the laser light transmitting resin member 3, the first laser light transmitting and absorbing resin member 1, and the second laser light transmitting and absorbing resin member 2 are integrated. I got a body 10. The welding state of the laser welded body 10 was good.

Example 6-1
(1) Preparation of Laser Light Transmissible Resin Member The same operation as in Example 5 was carried out to manufacture one laser light transparent resin member 3 as a laser light irradiated resin member. The transmittance and the absorbance of the laser light transmitting resin member 3 were measured in the same manner as in Example 1-1. The results are shown in Table 5.

(2) Preparation of first laser light transmitting and absorbing resin member and second laser light transmitting and absorbing resin member 499.85 g of polyamide (PA) 66 resin (manufactured by Asahi Kasei Corporation, trade name: Leona (registered trademark) 1300 S) And 0.15 g of nigrosine A were placed in a stainless steel tumbler and mixed by stirring for 1 hour to obtain resin compositions for the first and second laser light transmitting and absorbing resin members. The obtained resin composition for the first and second laser light transmitting and absorbing resin members is put into an injection molding machine, and molded by a usual method at a cylinder temperature of 270 ° C. and a mold temperature of 60 ° C. X A rectangular plate-shaped first laser beam transmitting and absorbing resin member 1 and a second laser beam transmitting and absorbing resin member 2 each having a width of 50 mm and a thickness of 1 mm were produced. The transmittances and absorbances of the two laser light transmitting and absorbing resin members 1 and 2 were measured in the same manner as in Example 1-1. The results are shown in Table 5.

(3) Preparation of Laser Welded Body As shown in FIG. 3 (b), the end portions of both the laser light transmitting and absorbing resin members 1 and 2 are butted and brought into contact with each other to form a butted portion B. The laser light transmitting resin member 3 was superimposed on the two resin member pieces 1 and 2 so as to cover the butted portion B. Thereby, the contact portion N _3-1 , which is the contact surface between the laser beam transmitting resin member 3 and the first laser beam transmitting and absorbing resin member 1, and the laser beam transmitting resin member 3 and the second laser beam transmitting and absorbing A contact portion N _3-2 which is a contact surface with the flexible resin member 2 was formed. From the top of the first laser light transmitting / absorbing resin member 1 toward the butt portion B substantially perpendicularly to the surface, the laser light L from the diode laser (wavelength: 940 nm continuous) having a power of 200 W is a butt portion It irradiated, making it scan with a scanning speed of 40 mm / sec and a scanning distance of 20 mm in a straight line along B. As a result, welding was performed at the butt portion B and the contact portions N _3-1 and N _3-2 , and the laser welded body 10 of Example 6-1 in which the respective resin members 1, 2 and 3 were integrated was obtained. About this laser welding body 10, it operated similarly to Example 1-1, and the measurement of tensile strength and evaluation of welding mode were performed. The results are shown in Table 5.

(Example 6-2)
(1) Preparation of laser ray transmitting resin member 496.99 g of polyamide (PA) 66 resin (Asahi Kasei Co., Ltd., trade name: Leona (registered trademark) 1300 S), 3.0 g of coloring agent E, nigrosine A The same procedure as in Example 5 was carried out except that 0.01 g of the above was placed in a stainless steel tumbler and stirred and mixed for 1 hour, and one laser light transmitting resin member 3 as a laser light irradiated resin member was operated. Made. The transmittance and the absorbance of the laser light transmitting resin member 3 were measured in the same manner as in Example 1-1. The results are shown in Table 5.

(2) Preparation of first laser light transmitting and absorbing resin member and second laser light transmitting and absorbing resin member The first laser light transmitting and absorbing resin member 1 and the second laser light are operated in the same manner as in Example 6-1. A permeable and absorbent resin member 2 was produced. The transmittances and absorbances of the two laser light transmitting and absorbing resin members 1 and 2 were measured in the same manner as in Example 1-1. The results are shown in Table 5.

(3) Preparation of Laser Welded Body A laser welded body 10 of Example 6-2 was obtained in the same manner as in Example 6-1. About this laser welding body 10, it operated similarly to Example 1-1, and the measurement of tensile strength and evaluation of welding mode were performed. The results are shown in Table 5.

Example 6-3
(1) Preparation of laser ray transmitting resin member 497.0 g of polyamide (PA) 66 resin (manufactured by Asahi Kasei Co., Ltd., trade name: Leona (registered trademark) 1300 S) and anthraquinone blue oil-soluble dye (CI Solvent) A single laser ray transmitting resin member 3 was produced in the same manner as in Example 5 except that 3.0 g of Blue 104) was placed in a stainless steel tumbler and mixed by stirring for 1 hour. The transmittance and the absorbance of the laser light transmitting resin member 3 were measured in the same manner as in Example 1-1. The results are shown in Table 5.

(2) Preparation of first laser light transmitting and absorbing resin member and second laser light transmitting and absorbing resin member The first laser light transmitting and absorbing resin member 1 and the second laser light are operated in the same manner as in Example 6-1. A permeable and absorbent resin member 2 was produced. The transmittances and absorbances of the two laser light transmitting and absorbing resin members 1 and 2 were measured in the same manner as in Example 1-1. The results are shown in Table 5.

(3) Preparation of Laser Welded Body A laser welded body 10 of Example 6-3 was obtained in the same manner as in Example 6-1. About this laser welding body 10, it operated similarly to Example 1-1, and the measurement of tensile strength and evaluation of welding mode were performed. The results are shown in Table 5.

  As can be seen from Table 5, the laser-welded articles of Examples 6-1 to 6-3 using the resin member containing nigrosine sulfate as the laser light absorber had both the contact site as the contact site and the butt site. Even when the laser light L is irradiated at a high scanning speed of 100 mm / sec, it exhibits high tensile strength, ie high welding strength, no welding marks, good welding conditions and can be manufactured with high production efficiency Met.

Example 6-4
(1) Preparation of laser ray transmitting resin member 497.0 g of polyamide (PA) 66 resin (Asahi Kasei Co., Ltd., trade name: Leona (registered trademark) 1300 S) and 3.0 g of the coloring agent B, and stainless steel The operation was carried out in the same manner as in Example 5 except that the product was put into a tumbler and stirred and mixed for 1 hour, and two pieces of laser ray transmitting resin members 3 were produced. The transmittance and the absorbance of the laser light transmitting resin member 3 were measured in the same manner as in Example 1-1. The results are shown in Table 6.

(2) Preparation of first laser light transmitting and absorbing resin member and second laser light transmitting and absorbing resin member The first laser light transmitting and absorbing resin member 1 and the second laser light are operated in the same manner as in Example 3-1. Two sheets of each of the permeable and absorbent resin members 2 were produced. The transmittances and absorbances of the two laser light transmitting and absorbing resin members 1 and 2 were measured in the same manner as in Example 1-1. The results are shown in Table 6.

(3) Preparation of Laser Welded Body As shown in FIG. 3 (d), the end portions of the first laser beam transmitting and absorbing resin member pieces 1 a and 1 b which are the first laser beam transmitting and absorbing resin member 1 are butted together. site B ₁ butt upper in contact, the second laser-transmissible-absorptive resin piece 2a a second laser-transmissible-absorptive resin member 2, a portion abutting in contact against the ends of the 2b lower B _Two were formed respectively. Next, the first laser light transmitting and absorbing resin member 1 and the second laser light transmitting and absorbing resin member 2 are superposed so that the butting parts B ₁ and B ₂ are vertically overlapped, and further, the laser light irradiated resin member is used. The upper and lower laser light transmitting resin members 3a and 3b sandwich the two laser light transmitting and absorbing resin members 1 and 2 which are overlapped. At this time, the site B ₁ upper laser ray transmitting resin member 3a is butt upper and lower laser-transmissible resin member 3b is a portion B ₂ butt upper, arranged so as respectively contact. Thereby, a plurality of abutting portions B ₁ and B ₂ and a plurality of abutting portions N _3a-1a , N _3a-1b , N _1a-2a , N _1b-2b , N _3b-2a and N _3b-2b are formed. did.

Laser light L from a diode laser with a power of 200 W (wavelength: 940 nm continuous) from the upper side of the upper laser light transmitting resin member 3a toward both butting parts B ₁ and B ₂ substantially perpendicularly to this surface The laser was irradiated while being scanned at a scanning speed of 40 mm / sec and a scanning distance of 20 mm in a straight line along both butted parts B ₁ and B ₂ . As a result, welding is performed at both butting sites B ₁ and B ₂ , and the respective abutting sites N _3a-1a , N _3a-1b , N _1a-2a , N _1b-2b , N _3b-2a and N _3b-2b , The laser welding body 10 of Example 6-4 in which the resin members 1, 2, 3a, 3b were integrated was obtained. In the laser-welded article 10, the first laser light transmitting / absorbing resin member piece 1a and the first laser light transmitting / absorbing resin member piece 1b are the second laser light transmitting / absorbing resin member piece 2a and the second laser light transmission. The tensile strength was measured in the same manner as in Example 1-1 except that the absorbent resin piece 2b was pulled horizontally in the direction away from each other. The welding mode was also evaluated in the same manner as in Example 1-1. The results are shown in Table 6.

  As can be seen from Table 6, the laser-welded article of Example 6-4 using a resin member containing nigrosine sulfate as a laser light absorber has high tensile strength, ie high welding, despite its four-layer structure. It showed strength and no welding marks, indicating a good welding state.

(Example 7-1)
(1) Preparation of first laser light transmitting and absorbing resin member 494.85 g of polyamide (PA) 66 resin (manufactured by Asahi Kasei Corporation, trade name: Leona (registered trademark) 1300 S), and 0.15 g of nigrosine A, 5.0 g of the coloring agent C was added to a stainless steel tumbler, and stirred and mixed for 1 hour to obtain a resin composition for a first laser ray transmitting and absorbing resin member. The resin composition for the first laser light transmitting and absorbing resin member thus obtained is introduced into an injection molding machine, and a perspective view is shown in FIG. 9 (a) at a cylinder temperature of 270 ° C. and a mold temperature of 60 ° C. A lid 4 as a first laser light transmitting and absorbing resin member having a disk-shaped head 4a and a cylindrical sleeve 4b coaxial with the head 4a, as shown in FIG. . The outer dimension of the head 4a is 50 mm in outer diameter × 2 mm in thickness. The outer dimension of the sleeve portion 4 b is 42 mm in outer diameter × 4 mm in height. The lid 4 has a step 4c with a width of 4 mm on its outer peripheral surface due to the difference in outer diameter between the head 4a and the sleeve 4b.

(2) Preparation of second laser light transmitting and absorbing resin member The polyamide (PA) 66 resin, nigrosine A and colorant C are stirred and mixed in the same manner as the first laser light transmitting and absorbing resin member described above. Then, a second laser light transmitting and absorbing resin member resin composition was obtained. As shown in FIG. 9A, the obtained resin composition for the second laser light transmitting and absorbing resin member is introduced into an injection molding machine, and the cylinder temperature is 270 ° C., and the mold temperature is 60 ° C. by a usual method. A cylindrical container 5 having a circular bottom, a peripheral wall extending upward at the periphery of the bottom, and an opening edge 5a opened at the upper end of the peripheral wall was produced. The outer dimension of the cylindrical container 5 is 50 mm in outer diameter × 35 mm in height, and the inner dimension thereof is 43 mm in inner diameter × 32 mm in height. The cylindrical container 5 has a thickness of 3 mm.

  The transmittance and the absorbance of the lid 4 and the cylindrical container 5 were measured in the same manner as in Example 1-1. The results are shown in Table 7.

(3) Preparation of Laser Welded Body The sleeve 4b of the lid 4 was inserted into the hollow space of the cylindrical container 5 from the opening edge 5a, and the lid 4 and the cylindrical container 5 were fitted together by hand. Thereby, as shown in FIG. 9 (b), which is a partially enlarged longitudinal sectional view of the lid 4 and the cylindrical container 5, the contact portion N where the step 4 c and the opening edge 5 a overlap and contact; A butt portion B in which the sleeve portion 4 b and the inner wall surface of the cylindrical container 5 are butted to each other is formed. The butt portion B is a difference between the outer diameter of the sleeve 4 b and the inner diameter of the cylindrical container 5 and the deviation of the central axis between the fitted lid 4 and the cylindrical container 5. It has a point where the inner wall surface of 5 is in contact and a point where a slight play (air gap) occurs.

  From the top of the lid 4 that is the first laser light transmitting / absorbing resin member, toward the butt portion B substantially perpendicularly to this surface, the diode laser with a power of 200 W (wavelength: 940 nm continuous) from the laser light L Was irradiated while scanning at a scanning speed of 40 mm / sec so as to draw a circle along the contact area N. Thereby, welding was carried out at the contact portion N, and the laser-welded body 10 of Example 7-1 in which the lid 4 and the cylindrical container 5 were integrated was obtained. With respect to this laser-welded article 10, a hole was made in the bottom of the cylindrical container 5, and pressure was applied by injecting air to measure the pressure at the time of leak, and the pressure resistance (MPa) was determined. The welding state was evaluated on the condition that the pressure resistance is good at 0.3 MPa or more and poor at less than 0.3 MPa. The results are shown in Table 7.

(Example 7-2)
(1) Preparation of first laser light transmitting and absorbing resin member and second laser light transmitting and absorbing resin member Using 499.85 g of polyamide (PA) 66 resin and 0.15 g of nigrosine A, no colorant is used By following the same procedure as in Example 7-1 except for the above, a lid 4 which is a first laser ray transmitting and absorbing resin member and a cylindrical container 5 which is a second laser ray transmitting and absorbing resin member are manufactured. did. The transmittance and the absorbance of the lid 4 and the cylindrical container 5 were measured in the same manner as in Example 1-1. The results are shown in Table 7.

(2) Preparation of Laser Welded Body A laser welded body 10 of Example 7-2 was produced in the same manner as in Example 7-1. The welding state of the laser welded product 10 was evaluated in the same manner as in Example 1-1. The results are shown in Table 7.

  The laser-welded articles of Examples 7-1 and 7-2 using the first and second laser light transmitting and absorbing resin members containing nigrosine sulfate as the laser light absorber are the first laser light transmitting and absorbing resin members The lid 4 and the cylindrical container 5 which is the second laser light transmitting and absorbing resin member are high in strength and airtight. By using the sulfate of nigrosine as a laser light absorber, the fluidity of the resin is enhanced. Therefore, even if a plurality of resin members to be welded have asperities on the surface or have gaps between them, the resin exhibiting high fluidity at the time of melting fills the asperities and gaps, so the resin The members are welded airtightly. In addition, the airtightness of the resin members can be further improved by repeatedly performing the irradiation scan of the laser light.

(Example 8-1)
(1) Preparation of first laser beam transmitting and absorbing resin member and second laser beam transmitting and absorbing resin member The resin for the first and second laser beam transmitting and absorbing resin members is operated in the same manner as in Example 7-2. The composition was obtained. The resin composition for the first and second laser light transmitting and absorbing resin members thus obtained is put into an injection molding machine, and the cylinder temperature is 270 ° C. and the mold temperature is 60 ° C. according to the usual method, as shown in FIG. A first laser beam transmitting and absorbing resin member 1 having a rectangular plate shape as shown in FIG. 1 and a second laser beam transmitting and absorbing resin member 2 having an L-shaped plate shape are manufactured. The transmittances and absorbances of the two laser light transmitting and absorbing resin members 1 and 2 were measured in the same manner as in Example 1-1. As a result, the absorbances a ₁ and a ₂ were 0.18, and the transmittance was 61.8%.

(2) Preparation of Laser Welded Body As shown in FIG. 5 (b), one side of the first laser light transmitting and absorbing resin member 1 and one side of the second laser light transmitting and absorbing resin member 2 The end portions were arranged side by side so as to form a flat surface at the end portions thereof, and the contact portions N were formed. As a result, the contact portion N is exposed at the end portions of both the laser light transmitting and absorbing resin members 1 and 2. First, a laser beam L is output from a diode laser (wavelength: 940 nm continuous) toward the contact portion N from the first laser light transmitting / absorbing resin member 1 side substantially perpendicularly to the surface thereof, The irradiation was performed while scanning at a scanning speed of 40 mm / sec and a scanning distance of 20 mm. Then, the laser light L having the same output and wavelength as this was irradiated to the contact area N exposed at the end of both the laser light transmission and absorption resin members 1 and 2 without changing the scanning speed and the scanning distance . Finally, light was emitted from the second laser light transmitting / absorbing resin member 2 side to the contact portion N substantially perpendicularly to the surface without changing the output, the wavelength, the scanning speed and the scanning distance. Thereby, welding was carried out at the contact portion N, and a laser-welded body 10 of Example 8-1 in which both the laser light transmitting and absorbing resin members 1 and 2 were integrated was obtained. The welding state of the laser welded body 10 was good.

(Example 8-2)
(1) Preparation of first laser beam transmitting and absorbing resin member and second laser beam transmitting and absorbing resin member The resin for the first and second laser beam transmitting and absorbing resin members is operated in the same manner as in Example 7-2. The composition was obtained. The resin composition for the first and second laser light transmitting and absorbing resin members thus obtained is put into an injection molding machine, and the cylinder temperature is 270 ° C. and the mold temperature is 60 ° C. according to the usual method, as shown in FIG. And a second laser light transmitting and absorbing resin member 2 having a rectangular plate shape and having a seam 1c protruding from a part of one surface of a rectangular parallelepiped as shown in FIG. Was produced. The width of the step of the seam 1 c is the same as the thickness of the second laser light transmitting and absorbing resin member 2.

(2) Preparation of Laser Welded Body As shown in FIG. 5C, the end of the second laser light transmitting and absorbing resin member 2 is butted against the step of the seam 1c of the first laser light transmitting and absorbing resin member 1 Forming a butt part B in contact with them and continuously extending vertically downward to the step of the joint 1c and a part of one surface of the second laser light transmitting and absorbing resin member 2; It piled up and formed contact part N. As a result, the seam 1c and the other surface of the second laser light transmitting and absorbing resin member 2 form a continuous flat surface, and the butted part B is exposed on this flat surface. First, the laser light L is scanned from the diode laser [wavelength: 940 nm continuous] toward the butt portion B substantially perpendicular to the surface from the first laser light transmitting / absorbing resin member 1 side. The irradiation was performed while scanning at a speed of 40 mm / sec and a scanning distance of 20 mm. Then, without changing the scanning speed and scanning distance to the butt area B where the laser light L having the same output and wavelength as this is exposed at the junction 1c and the other surface of the second laser light transmitting and absorbing resin member 2 Irradiated directly. Finally, light was emitted from the second laser light transmitting / absorbing resin member 2 side to the contact portion N substantially perpendicularly to the surface without changing the output, the wavelength, the scanning speed and the scanning distance. Thereby, welding was carried out at the butt portion B and the abutting portion N, and the laser-welded body 10 of Example 8-2 in which both the laser light transmitting and absorbing resin members 1 and 2 were integrated was obtained. The welding state of the laser welded body 10 was good.

(Example 9)
(1) Preparation of first laser beam transmitting and absorbing resin member and second laser beam transmitting and absorbing resin member The resin for the first and second laser beam transmitting and absorbing resin members is operated in the same manner as in Example 7-2. The composition was obtained. The resin composition for the first and second laser light transmitting and absorbing resin members thus obtained is put into an injection molding machine, and the cylinder temperature is 270 ° C., and the mold temperature is 60 ° C. by the usual method, as shown in FIG. Cylindrical first laser light transmitting and absorbing resin member 1 and second laser light transmitting and absorbing resin member 2 having open ends as shown in FIG. Both of the laser light transmitting and absorbing resin members 1 and 2 had a cylindrical shape with an outer diameter of 50 mm × a length between both ends of 35 mm × a thickness of 3 mm, and had the same shape. Both laser light transmitting and absorbing resin members 1 and 2 have the same shape. The transmittances and absorbances of the two laser light transmitting and absorbing resin members 1 and 2 were measured in the same manner as in Example 1-1. As a result, the absorbances a ₁ and a ₂ were 0.18, and the transmittance was 61.8%.

(2) Preparation of Laser Welded Body As shown in FIG. 7A, the opening edges of the first laser light transmitting and absorbing resin member 1 and the second laser light transmitting and absorbing resin member 2 are butted to each other at the butt portion B. Formed. A laser beam L was emitted from the diode laser (wavelength: 940 nm continuous) having a scanning speed of 40 mm / sec and a scanning distance of 20 mm while being directed toward the butt portion B along with this. As a result, welding was performed at the butt portion B, and a laser-welded body 10 of Example 9 in which both the laser light transmitting and absorbing resin members 1 and 2 were integrated was obtained. The tensile strength of this laser-welded article 10 was measured in the same manner as in Example 1-1. The welding mode was also evaluated in the same manner as in Example 1-1. The tensile strength was 724 N and the welding condition was good.

(Example 10)
(1) Preparation of first laser light transmitting and absorbing resin member and second laser light transmitting and absorbing resin member 499.85 g of polyamide (PA) 66 resin (manufactured by Asahi Kasei Corporation, trade name: Leona (registered trademark) 1300 S) And 0.15 g of nigrosine A were placed in a stainless steel tumbler and mixed by stirring for 1 hour to obtain a resin composition for weakly absorbing a laser beam resin member. The obtained resin composition for weakly absorbing a laser beam resin member is charged into an injection molding machine, and molded by a usual method at a cylinder temperature of 295 ° C. and a mold temperature of 80 ° C., as shown in FIG. The same weak cylindrical laser light absorbing resin members 1 and 2 were produced. The external size of this cylindrical shape was 50 mm in outer diameter × 35 mm in length between both ends × 3 mm in thickness.

(2) Preparation of Laser Welded Body As shown in FIG. 8, the opening edges of the first laser light transmitting and absorbing resin member 1 and the second laser light transmitting and absorbing resin member 2 are butted to form a butt portion B. . Laser light L is emitted from a diode laser (wavelength: 940 nm continuous) toward the butt area B, and both laser light transmitting and absorbing resin members 1 and 2 are rotated in one direction at 600 rpm while the radiation source is fixed. The irradiation was performed for 20 seconds while scanning (scanning speed 1570 mm / sec). As a result, welding was performed at the butt portion B, and a laser-welded body 10 of Example 10 in which both the laser light transmitting and absorbing resin members 1 and 2 were integrated was obtained. This laser-welded article 10 was equally divided into eight in a direction parallel to the central axis (in a direction perpendicular to the abutted portion), and the tensile strength of one piece was measured in the same manner as in Example 1-1. The welding mode was also evaluated in the same manner as in Example 1-1. The tensile strength was 1199.1 N and the welding condition was good.

  The laser welded body according to the present invention can be used in various automobile / vehicle parts, electricity, electronic parts, building materials / packaging materials, life related parts, etc., various containers / tanks requiring air tightness, various piping, various valves, various motors, various kinds. Used for bottles etc. Specifically, for example, an automobile instrument such as an internal instrument panel or a resonator (muffler) in an engine room, a medical tube used when dripping an infusion or a nutrient, a liquid food or a beverage composition are enclosed. It is used for food packaging materials such as spout pouches, plastic bottle labels, and home appliance parts such as housings.

1 the first laser-transmissible-absorptive resin member, 1a, 1b is first laser-transmissible-absorptive resin piece, 1c is white joint, 1d is white insertion passage, 1d ₁ step portion, 1d ₂ insertion portion, 1e is barrel, the 2 second laser-transmissible-absorptive resin member, 2a, 2b and the second laser-transmissible-absorptive resin piece, 2c are white joint, 2d is white篏合passage, 2d ₁ opening edge, 2d ₂ is a bonding portion, 2e is a recess, 3 is a laser light transmitting resin member, 3a is an upper laser light transmitting resin member, 3b is a lower laser light transmitting resin member, 4 is a lid, and 4a is a head 4b is a sleeve, 4c is a stepped portion, 5 is a cylindrical container, 5a is an opening edge, 10 is a laser-welded body, 11 is a laser light transmitting resin member, 12 is a laser light absorbing resin member, 13 is a conventional laser welding body, B is butt site, _{B 1} is an upper butt portion, _{B 2} is Side abutting part, L is the laser beam, M is fused _{portion, N, N 1-2a, N 1-2b} , N 1a-2, N 1b-2, N 1a-2a, N 1b-2b, N 3b- _{2a, N 3b-2b, N} 3-1, N 3-2, N 3-1a, N 3-1b, N 3a-1a, N 3a-1b are abutting portion, _{N 1} is the upper contact portion, N ₂ is a lower contact part, and X and Y are directions.

Claims (12)

  One or more resin members containing a thermoplastic resin and nigrosine sulfate having a sulfate ion concentration of 0.3 to 5.0% by mass and having an absorbance a of 0.09 to 0.9 are overlaid and A laser-welded body, comprising: a contact portion formed by being butted against each other, wherein at least a part of the contact portion is laser-welded.   The plurality of resin members are a first laser light transmitting and absorbing resin member which is a laser light irradiated resin member, and a second laser light transmitting and absorbing resin member of the same type or different from this. The laser-welded body as described in 1.   The plurality of resin members are a first laser light transmitting and absorbing resin member and a second laser light transmitting and absorbing resin member of the same kind or different from the first laser light transmitting and absorbing resin member, which are both laser light irradiated resin members. The laser-welded body as described in 1. The absorbance _{a 1} of the first laser-transmissible-absorptive resin member, the absorbance ratio _a 1 / _{a 2} between the absorbance _{a 2} of the second laser-transmissible-absorptive resin member, is 0.3 to 1.2 The laser-welded article according to claim 2 or 3, wherein   Laser light transmission, which is a laser light irradiated resin member containing the one or more resin members, and the same or different thermoplastic resin as the thermoplastic resin and having an absorbance b of 0.01 to 0.09 It has a contact site formed by overlapping and / or buttling with an elastic resin member, and at least a part of the contact site is laser-welded. Laser weldment as described. The plurality of resin members are a first laser light transmitting and absorbing resin member and a second laser light transmitting and absorbing resin member of the same type as or different from this, and the absorbance a _{1 of} the first laser light transmitting and absorbing resin member and the above laser-welded article according to claim 5, absorbance ratio a _{1 /} a ₂ between the absorbance a ₂ of the second laser-transmissible-absorptive resin member, characterized in that it is a 0.3 to 1.2. The volume resistivity of the said nigrosine sulfate is 5.0 * 10 < ⁹ > ohm * cm-7.0 * 10 < ¹¹ > ohm * cm, The laser welding body in any one of Claim 1 to 6 characterized by the above-mentioned.   The melt flow rate of the said resin member is 11-30 g / 10min, The laser welding body in any one of Claim 1 to 7 characterized by the above-mentioned.   9. The method according to any one of claims 1 to 8, wherein the thermoplastic resin is at least one selected from polyamide resin, polycarbonate resin, polyphenylene sulfide resin, polyethylene terephthalate resin, polybutylene terephthalate resin, and polypropylene resin. Laser weldment as described.   The laser-welded article according to any one of claims 1 to 9, wherein the resin member contains a colorant containing anthraquinone.   11. The laser-welded article according to claim 10, wherein the anthraquinone is an anthraquinone salt forming dye. The anthraquinone salt-forming dye is A ^- B ⁺ (A ^- is an anion derived from anthraquinone and B ⁺ is a cation derived from organic ammonium) or AB (A is a residue of anthraquinone and B is organic ammonium 12. The laser-welded article according to claim 11, which is a residue.

Images