JP2016137713A - Member for laser deposition and molding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a member for laser deposition excellent in laser deposition processability, in which a weld has high laser transmittance; and to provide a molding which is laser-deposited by using the same.SOLUTION: There is provided a member for laser deposition formed by injection molding of a thermoplastic polyester-based resin material. In the member for laser deposition, a portion to be laser-deposited in the member is on a position having a distance separated as long as 15 mm or longer from a gate of an injection mold, and the light transmittance of a laser beam having a wavelength of 940 nm is 30% or higher.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a laser welding member and a molded article, and more particularly to a laser welding member having high laser transmittance and excellent laser welding processability and a molded article laser welded using the same.

In recent automobile parts and consumer parts, from the viewpoint of environment such as weight reduction and recycling, parts that have conventionally used metals have been made resin, and resin products have been downsized. Thermoplastic polyester resin is excellent in mechanical strength, chemical resistance, electrical insulation, etc., and has excellent heat resistance, moldability, and recyclability, so it is widely used in various equipment parts. ing. In particular, thermoplastic polyester resins such as polybutylene terephthalate resin are widely used in electrical and electronic parts that require fire safety because they are excellent in mechanical strength and moldability and can be flame retardant. Yes.
In recent years, in order to manufacture these equipment parts, examples of joining parts by welding processing for increasing productivity have been increasing, and laser welding, which has little influence on electronic parts, has been frequently used. Yes.

  However, thermoplastic polyester resin, especially polybutylene terephthalate resin, as compared with polycarbonate resin, polystyrene resin, etc., has low laser transmission, so laser welding processability is poor and welding strength tends to be insufficient. It is rather unsuitable.

In order to improve the laser weldability of the polybutylene terephthalate resin, a method using a copolymerized polybutylene terephthalate (Patent Document 1) has been proposed. However, with this technique, sufficient weldability may not be obtained due to a gap between welding members caused by warpage deformation of the molded product. Furthermore, a method for improving weldability by adding a laser transmission absorbent such as nigrosine to a thermoplastic resin has also been proposed (Patent Document 2).
In particular, flame-retarded polybutylene terephthalate resin has low laser permeability, and laser welding is often difficult. Patent Document 3 proposes a method for achieving both laser permeability and flame retardancy by adding phosphinic acids to polybutylene terephthalate resin. However, the laser permeability is low, and the influence of the warpage of the molded product is also included. In many cases, sufficient welding strength could not be obtained.

Japanese Patent No. 3510817 JP 2008-1112 A International Publication WO2007-77794

  As described above, attempts to improve laser welding processability by blending other components with a thermoplastic polyester resin such as polybutylene terephthalate resin are likely to be accompanied by various problems. A welding member for laser welding is often manufactured by injection molding, and is molded by injecting a resin in a fluid state from a gate provided in a cavity of a molding die. Particularly recently, the weight reduction and thinning of parts are progressing rapidly, and the characteristics and performance tend to vary depending on the part of the molded product.

  An object (problem) of the present invention is to provide a laser welding member having high laser transmittance and excellent laser welding processability in view of the above situation.

As a result of repeated investigations on individual parts of a welding member obtained by injection-molding a thermoplastic polyester resin, the present inventor has achieved excellent laser by making a specific part of a molded product a welding part for laser welding. The inventors have found that the transparency and laser welding processability can be exhibited, and have reached the present invention.
The present invention relates to the following laser welding members, molded articles, and laser welding methods.

[1] A laser welding member formed by injection molding a thermoplastic polyester resin material,
The laser welded portion of the member is located at a distance of 15 mm or more from the gate of the injection mold, and the light transmittance of laser light having a wavelength of 940 nm is 30% or more. Materials.
[2] The laser welding member according to the above [1], wherein the thermoplastic polyester resin material is injection-molded under the condition of an injection rate of 10 to 300 cm ³ / sec defined below.
Injection rate: Thermoplastic polyester under the condition of a surface progression coefficient of 100 to 1200 cm ³ / sec · cm defined as follows: resin material capacity per unit time [3] injected from a discharge nozzle of an injection molding machine into a mold cavity The laser welding member according to the above [1] or [2], which is obtained by injection molding a resin material.
Surface progression coefficient: Value obtained by dividing the injection rate by the thickness of the mold cavity into which the resin material is injected [4] The melt volume rate of the thermoplastic polyester resin material (measured at 250 ° C. under a load of 5 kg) 10 cm ^3/10 minutes or more at which the above-mentioned [1] laser welding member according to any one of - [3].

[5] The laser welding member according to any one of [1] to [4], wherein the thermoplastic polyester resin material includes a polybutylene terephthalate resin and / or a polyethylene terephthalate resin.
[6] The thermoplastic polyester resin material includes a polybutylene terephthalate resin and a polyethylene terephthalate resin, and the content of the polyethylene terephthalate resin is 5 to 50 mass with respect to a total of 100 mass% of the polybutylene terephthalate resin and the polyethylene terephthalate resin. The laser welding member according to any one of the above [1] to [5], which is%.
[7] The thermoplastic polyester resin material includes a polybutylene terephthalate homopolymer and a modified polybutylene terephthalate resin, and the content of the modified polybutylene terephthalate resin is 100% by mass in total of the polybutylene terephthalate resin and the modified polybutylene terephthalate resin. The laser welding member according to any one of the above [1] to [6], which is 10 to 70% by mass relative to the mass.
[8] The thermoplastic polyester resin material includes a polybutylene terephthalate resin and a polycarbonate resin, and the content of the polycarbonate resin is 10 to 50% by mass with respect to a total of 100% by mass of the polybutylene terephthalate resin and the polycarbonate resin. The laser welding member according to any one of the above [1] to [4].
[9] The thermoplastic polyester resin material contains polybutylene terephthalate resin, polystyrene and / or butadiene rubber-containing polystyrene and polycarbonate resin, and a total of 100 of polybutylene terephthalate resin, polystyrene and / or butadiene rubber-containing polystyrene and polycarbonate resin. The above-mentioned [1] to [4] containing 30 to 90% by mass of polybutylene terephthalate resin, 1 to 50% by mass of polystyrene and / or butadiene rubber-containing polystyrene, and 1 to 50% by mass of polycarbonate resin on a mass% basis. The laser welding member according to any one of the above.

[10] The laser welding member according to any one of [1] to [9], which is used for a member on a laser transmission side.
[11] The first laser welding member according to any one of the above [1] to [10] and a second member made of a resin material having laser absorptivity are provided on the first laser welding member side. A molded product made by laser welding by irradiating with laser light.
[12] A first laser welding member formed by injection molding of a thermoplastic polyester resin material and a second member made of a resin material having laser absorbability are laser-treated from the first laser welding member side. A method for producing a laser welded molded product in which laser welding is performed by irradiating light,
The part to be laser welded in the first member is located at a distance of 15 mm or more from the gate of the injection mold, and the light transmittance of laser light having a wavelength of 940 nm is 30% or more. A method for manufacturing a laser welded product.

  The laser welding member formed by injection molding of the thermoplastic polyester resin material of the present invention has a high laser transmittance at the welded portion, is excellent in laser welding processability, and a welded body obtained by laser welding this welding member is Excellent weld strength.

It is a top view which shows the position on the injection molded product of the permeable materials 1-3 used in the Example. It is the schematic which shows the laser welding intensity | strength measuring method in an Example. (A) is the figure which looked at the laser absorption material and the permeation | transmission material from the side surface, (b) shows the figure seen from the upper direction, respectively. It is a photograph of the reflected electron image by the SEM / EDS analysis of the surface layer part of the molded object obtained in Example 20. FIG. It is a perspective view of the box-type molded object used for the evaluation of the curvature property in an Example.

The laser welding member of the present invention is a laser welding member formed by injection molding a thermoplastic polyester resin material,
The part of the member to be laser welded is located at a distance of 15 mm or more from the gate of the injection mold, and the light transmittance of laser light having a wavelength of 940 nm is 30% or more.

  Hereinafter, the contents of the present invention will be described in detail. The following description may be made based on representative embodiments and specific examples of the present invention, but the present invention is not construed as being limited to such embodiments and specific examples.

[Thermoplastic polyester resin material]
The resin material used for the laser welding member of the present invention contains a thermoplastic polyester resin as a main component.
The thermoplastic polyester resin is a polyester obtained by polycondensation of a dicarboxylic acid compound and a dihydroxy compound, polycondensation of an oxycarboxylic acid compound or polycondensation of these compounds, and may be either a homopolyester or a copolyester. .

As the dicarboxylic acid compound constituting the thermoplastic polyester resin, an aromatic dicarboxylic acid or an ester-forming derivative thereof is preferably used.
As aromatic dicarboxylic acids, 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, diphenyl ether-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, pyridine-2,5-dicarboxylic acid, etc. Refutaru acid can be preferably used.

These aromatic dicarboxylic acids may be used as a mixture of two or more. As is well known, these compounds can be used in polycondensation reactions with dimethyl esters or the like as ester-forming derivatives in addition to free acids.
If the amount is small, together with these aromatic dicarboxylic acids, aliphatic dicarboxylic acids such as adipic acid, azelaic acid, dodecanedioic acid, sebacic acid, 1,2-cyclohexanedicarboxylic acid, 1,3-cyclohexanedicarboxylic acid and 1 One or more alicyclic dicarboxylic acids such as 1,4-cyclohexanedicarboxylic acid can be mixed and used.

Examples of the dihydroxy compound constituting the thermoplastic polyester resin include aliphatic diols such as ethylene glycol, propylene glycol, butanediol, hexylene glycol, neopentyl glycol, 2-methylpropane-1,3-diol, diethylene glycol, and triethylene glycol. , Alicyclic diols such as cyclohexane-1,4-dimethanol, and mixtures thereof. If the amount is small, one or more kinds of long-chain diols having a molecular weight of 400 to 6,000, that is, polyethylene glycol, poly-1,3-propylene glycol, polytetramethylene glycol, and the like may be copolymerized.
In addition, aromatic diols such as hydroquinone, resorcin, naphthalenediol, dihydroxydiphenyl ether, and 2,2-bis (4-hydroxyphenyl) propane can also be used.

  In addition to the above-mentioned bifunctional monomers, trifunctional monomers such as trimellitic acid, trimesic acid, pyromellitic acid, pentaerythritol, and trimethylolpropane are introduced to introduce a branched structure, and fatty acids are used for molecular weight control. A small amount of a monofunctional compound can be used in combination.

  As the thermoplastic polyester resin, a resin mainly composed of a polycondensation of a dicarboxylic acid and a diol, that is, a resin composed of 50% by mass, preferably 70% by mass or more of the total resin, is used. The dicarboxylic acid is preferably an aromatic carboxylic acid, and the diol is preferably an aliphatic diol.

  Of these, polyalkylene terephthalate in which 95 mol% or more of the acid component is terephthalic acid and 95 mass% or more of the alcohol component is an aliphatic diol is preferable. Typical examples are polybutylene terephthalate and polyethylene terephthalate. These are preferably close to homopolyester, that is, 95% by mass or more of the total resin is composed of a terephthalic acid component and a 1,4-butanediol or ethylene glycol component.

The intrinsic viscosity of the thermoplastic polyester resin is preferably from 0.3 to 2 dl / g. From the viewpoint of moldability and mechanical properties, those having an intrinsic viscosity in the range of 0.5 to 1.5 dl / g are more preferable. When the intrinsic viscosity is lower than 0.3 dl / g, the resulting resin composition tends to have a low mechanical strength. On the other hand, if it is higher than 2 dl / g, the fluidity of the resin composition may be deteriorated and the moldability may be deteriorated or the laser weldability may be deteriorated.
The intrinsic viscosity of the thermoplastic polyester resin is a value measured at 30 ° C. in a 1: 1 (mass ratio) mixed solvent of tetrachloroethane and phenol.

  The amount of the terminal carboxyl group of the thermoplastic polyester resin may be appropriately selected and determined, but is usually 60 eq / ton or less, preferably 50 eq / ton or less, and more preferably 30 eq / ton or less. . If it exceeds 50 eq / ton, gas tends to be generated during melt molding of the resin composition. Although the lower limit of the amount of terminal carboxyl groups is not particularly defined, it is usually 10 eq / ton.

  The amount of the terminal carboxyl group of the thermoplastic polyester resin is a value measured by titration using a 0.01 mol / l benzyl alcohol solution of sodium hydroxide by dissolving 0.5 g of the polyester resin in 25 mL of benzyl alcohol. As a method for adjusting the amount of terminal carboxyl groups, a conventionally known arbitrary method such as a method for adjusting polymerization conditions such as a raw material charge ratio during polymerization, a polymerization temperature, a pressure reduction method, a method for reacting a terminal blocking agent, etc. Just do it.

  Especially, it is preferable that a thermoplastic polyester resin contains a polybutylene terephthalate resin and / or a polyethylene terephthalate resin, and it is preferable that 50 mass% or more in a thermoplastic polyester resin is a polybutylene terephthalate resin.

  Polybutylene terephthalate resin is manufactured by batch polymerization or continuous polymerization of dicarboxylic acid components mainly composed of terephthalic acid or their ester derivatives and diol components mainly composed of 1,4-butanediol. can do. In addition, after a low molecular weight polybutylene terephthalate resin is produced by melt polymerization, solid state polymerization can be performed under a nitrogen stream or under reduced pressure to increase the degree of polymerization (or molecular weight) to a desired value.

  The polybutylene terephthalate resin is preferably produced by a continuous melt polycondensation of a dicarboxylic acid component mainly composed of terephthalic acid and a diol component mainly composed of 1,4-butanediol.

  The catalyst used in performing the esterification reaction may be a conventionally known catalyst, and examples thereof include a titanium compound, a tin compound, a magnesium compound, and a calcium compound. Of these, titanium compounds are particularly preferred. Specific examples of the titanium compound as the esterification catalyst include titanium alcoholates such as tetramethyl titanate, tetraisopropyl titanate and tetrabutyl titanate, and titanium phenolates such as tetraphenyl titanate.

  The polybutylene terephthalate resin may be a polybutylene terephthalate resin modified by copolymerization (hereinafter, also referred to as “modified polybutylene terephthalate resin”). Examples thereof include polyester ether resins copolymerized with alkylene glycols (particularly polytetramethylene glycol), dimer acid copolymerized polybutylene terephthalate resins, and isophthalic acid copolymerized polybutylene terephthalate resins.

When the polyester ether resin copolymerized with polytetramethylene glycol is used as the modified polybutylene terephthalate resin, the proportion of the tetramethylene glycol component in the copolymer is preferably 3 to 40% by mass, and 5 to 30% by mass. % Is more preferable, and 10 to 25% by mass is more preferable. By setting it as such a copolymerization ratio, it tends to be excellent in the balance between laser weldability and heat resistance, which is preferable.
When using a dimer acid copolymerized polybutylene terephthalate resin as the modified polybutylene terephthalate resin, the proportion of the dimer acid component in the total carboxylic acid component is preferably 0.5 to 30 mol% as the carboxylic acid group, 1-20 mol% is more preferable, and 3-15 mol% is further more preferable. By setting it as such a copolymerization ratio, it exists in the tendency which is excellent in the balance of laser weldability, long-term heat resistance, and toughness, and is preferable.
When the isophthalic acid copolymerized polybutylene terephthalate resin is used as the modified polybutylene terephthalate resin, the ratio of the isophthalic acid component in the total carboxylic acid component is preferably 1 to 30 mol% as the carboxylic acid group, 20 mol% is more preferable, and 3 to 15 mol% is more preferable. By setting it as such a copolymerization ratio, it exists in the tendency which is excellent in the balance of laser weldability, heat resistance, injection moldability, and toughness, and is preferable.
Among the modified polybutylene terephthalate resins, polyester ether resins copolymerized with polytetramethylene glycol and isophthalic acid copolymerized polybutylene terephthalate resins are preferable.

  And preferable content of these copolymers is 5-50 mass% in a total amount of 100 mass% of a thermoplastic polyester resin, Furthermore, 10-40 mass%, Especially 15-30 mass%.

  The intrinsic viscosity of the polybutylene terephthalate resin is preferably 0.5 to 2 dl / g. From the viewpoint of moldability and mechanical properties, those having an intrinsic viscosity in the range of 0.6 to 1.5 dl / g are more preferable. If the intrinsic viscosity is lower than 0.5 dl / g, the resulting resin composition tends to have a low mechanical strength. On the other hand, if it is higher than 2 dl / g, the fluidity of the resin composition may be deteriorated and the moldability may be deteriorated or the laser weldability may be deteriorated. The intrinsic viscosity is a value measured at 30 ° C. in a 1: 1 (mass ratio) mixed solvent of tetrachloroethane and phenol.

  The terminal carboxyl group amount of the polybutylene terephthalate resin may be appropriately selected and determined, but is usually 60 eq / ton or less, preferably 50 eq / ton or less, and more preferably 30 eq / ton or less. . If it exceeds 50 eq / ton, gas tends to be generated during melt molding of the resin composition. Although the lower limit of the amount of terminal carboxyl groups is not particularly defined, it is usually 10 eq / ton in consideration of the productivity of production of polybutylene terephthalate resin.

  The amount of terminal carboxyl groups of the polybutylene terephthalate resin is a value measured by titration using a 0.01 mol / l benzyl alcohol solution of sodium hydroxide by dissolving 0.5 g of the polyalkylene terephthalate resin in 25 mL of benzyl alcohol. is there. As a method for adjusting the amount of terminal carboxyl groups, a conventionally known arbitrary method such as a method for adjusting polymerization conditions such as a raw material charge ratio during polymerization, a polymerization temperature, a pressure reduction method, a method for reacting a terminal blocking agent, etc. Just do it.

As a thermoplastic polyester resin, what contains polybutylene terephthalate resin and the said modified polybutylene terephthalate resin is also preferable. By containing a specific amount of the modified polybutylene terephthalate resin, the laser transmittance and laser weldability are easily improved, which is preferable.
When the polybutylene terephthalate resin and the modified polybutylene terephthalate resin are contained, the content of the modified polybutylene terephthalate resin is preferably 10 to 100% by mass of the total of the polybutylene terephthalate resin and the modified polybutylene terephthalate resin. It is 70 mass%, More preferably, it is 20-65 mass%, More preferably, it is 30-60 mass%. When the content of the modified polybutylene terephthalate resin is less than 10% by mass, the laser welding strength tends to decrease. When the content exceeds 70% by mass, the moldability may be remarkably decreased.

Further, the thermoplastic polyester resin preferably contains a polybutylene terephthalate resin and a polyethylene terephthalate resin. By containing a specific amount of polyethylene terephthalate resin, the laser transmittance and laser weldability are easily improved, which is preferable.
When the polybutylene terephthalate resin and the polyethylene terephthalate resin are contained, the content of the polyterylene terephthalate resin and the polyethylene terephthalate resin is preferably 5 to 50% by mass with respect to the total 100% by mass of the polybutylene terephthalate resin and the polyethylene terephthalate resin. More preferably, it is 10-45 mass%, More preferably, it is 15-40 mass%. When the content of the polyethylene terephthalate resin is less than 5% by mass, the laser welding strength tends to decrease, and when it exceeds 50% by mass, the moldability may be significantly decreased.

  Polyethylene terephthalate resin is a resin mainly composed of oxyethyleneoxyterephthaloyl units composed of terephthalic acid and ethylene glycol with respect to all structural repeating units, and includes structural repeating units other than oxyethyleneoxyterephthaloyl units. Also good. The polyethylene terephthalate resin is produced using terephthalic acid or a lower alkyl ester thereof and ethylene glycol as main raw materials, but other acid components and / or other glycol components may be used together as raw materials.

  Acid components other than terephthalic acid include phthalic acid, isophthalic acid, naphthalenedicarboxylic acid, 4,4′-diphenylsulfone dicarboxylic acid, 4,4′-biphenyldicarboxylic acid, 1,4-cyclohexanedicarboxylic acid, 1,3- Examples thereof include phenylenedioxydiacetic acid and structural isomers thereof, dicarboxylic acids such as malonic acid, succinic acid and adipic acid and derivatives thereof, and oxyacids such as p-hydroxybenzoic acid and glycolic acid or derivatives thereof.

  Examples of diol components other than ethylene glycol include 1,2-propanediol, 1,3-propanediol, 1,4-butanediol, aliphatic glycols such as pentamethylene glycol, hexamethylene glycol, and neopentyl glycol, cyclohexane Examples include alicyclic glycols such as dimethanol, and aromatic dihydroxy compound derivatives such as bisphenol A and bisphenol S.

  Further, the polyethylene terephthalate resin is a branched component, for example, trifunctional acid such as tricarballylic acid, trimellitic acid, trimellitic acid, etc., or tetrafunctional ester-like acid such as pyromellitic acid or glycerin, trimethylolpropane, pentane. An alcohol having a trifunctional or tetrafunctional ester-forming ability such as erythritol is copolymerized in an amount of 1.0 mol% or less, preferably 0.5 mol% or less, more preferably 0.3 mol% or less. There may be.

The intrinsic viscosity of the polyethylene terephthalate resin is preferably 0.3 to 1.5 dl / g, more preferably 0.3 to 1.2 dl / g, and particularly preferably 0.4 to 0.8 dl / g.
The intrinsic viscosity of the polyethylene terephthalate resin is a value measured at 30 ° C. in a 1: 1 (mass ratio) mixed solvent of tetrachloroethane and phenol.

Moreover, it is preferable that the density | concentration of the terminal carboxyl group of a polyethylene terephthalate resin is 3-50 eq / ton, especially 5-40 eq / ton, Furthermore, it is preferable that it is 10-30 eq / ton. When the terminal carboxyl group concentration is 50 eq / ton or less, gas is less likely to be generated during melt molding of the resin composition, and the mechanical properties of the obtained laser welding member tend to be improved. By setting the concentration to 3 eq / ton or more, the heat resistance, residence heat stability and hue of the laser welding member tend to be improved, which is preferable.
The terminal carboxyl group concentration of the polyethylene terephthalate resin is a value obtained by dissolving 0.5 g of polyethylene terephthalate resin in 25 mL of benzyl alcohol and titrating with 0.01 mol / L benzyl alcohol solution of sodium hydroxide. is there.
As a method for adjusting the amount of terminal carboxyl groups, a conventionally known arbitrary method such as a method for adjusting polymerization conditions such as a raw material charge ratio during polymerization, a polymerization temperature, a pressure reduction method, a method for reacting a terminal blocking agent, etc. Just do it.

The thermoplastic polyester resin material may contain other resins or additives. Other resins or additives will be described later.
In the present invention, the thermoplastic polyester resin material has a melt volume rate (MVR;. 250 ℃, measured under the conditions of a load 5 kg) is preferably at least 10 cm ^3/10 min, more preferably 15cm ^3/10 Use one that is more than minutes. 280 ° C., when measured under a load of 2.16kg is preferably 20 cm ^3/10 minutes or more, more preferably used as it is 30 cm ^3/10 minutes or more. By using a material having an MVR in such a range, even if the welding member has a thin part having a thickness of 2 mm or less, or 1.5 mm or less, or an extremely thin part having a thickness of 1 mm or less. Can be secured.

  The thermoplastic polyester resin material preferably has a crystallization temperature (Tc) of 190 ° C. or lower. That is, laser transmittance can be further improved by controlling the crystallization temperature (Tc) to be low. The crystallization temperature (Tc) is preferably 188 ° C. or lower, more preferably 185 ° C. or lower, further preferably 182 ° C. or lower, and particularly preferably 180 ° C. or lower. Moreover, the minimum is 160 degreeC normally, Preferably it is 165 degreeC or more. The crystallization temperature (Tc) was measured by DSC, and the details are as described in the examples.

  And the said thermoplastic polyester-type resin material is shape | molded by the injection molding method in the laser welding member of a desired shape. As the injection molding method, for example, a high-speed injection molding method, an injection compression molding method, or the like can be used.

  The injection molding conditions are not particularly limited, but the injection speed is preferably 10 to 500 mm / sec, more preferably 30 to 400 mm / sec, still more preferably 50 to 300 mm / sec, and particularly preferably 80 to 200 mm / sec. preferable. Moreover, 250-280 degreeC is preferable and, as for resin temperature, 255-275 degreeC is more preferable. The mold temperature is preferably 40 to 130 ° C, more preferably 50 to 100 ° C.

Further, it is preferable that the injection rate is defined as a resin material capacity per unit is injection time from the discharge nozzle to the mold cavity of the injection molding machine is ^{10~300cm 3 / sec, 15~200cm 3 /} sec Gayori Preferably, 25-100 cm < ³ > / sec is more preferable, and 50-90 cm < ³ > / sec is especially preferable. By setting the injection rate in such a range, it becomes easier to increase the laser transmittance of the non-gate side portion of the member, and by adjusting the gate position, the transmittance of the welded portion in the member can be further increased. . In injection molding, the volume of resin material injected in one injection is controlled by adjusting the injection volume of resin material per unit time and the time required for injection, but the material capacity of resin material per unit time is injected. Rate (unit: cm ³ / sec).

Moreover, it is preferable to perform injection molding under the condition that the surface progression coefficient defined below is 100 to 1200 cm ³ / sec · cm. By setting the surface progression coefficient in such a range, it becomes easier to increase the laser transmittance of the non-gate side portion of the member, and by adjusting the gate position, the transmittance of the welded portion in the member can be further increased. it can.
Surface progression coefficient: Value obtained by dividing the injection rate by the thickness of the mold cavity into which the resin material is injected. A preferable range of the surface progression coefficient is 200 to 1100 cm ³ / sec · cm, more preferably 250 to 1000 cm ³ / sec ·. cm, more preferably 300 to 950 cm ³ / sec · cm, and particularly preferably 400 to 900 cm ³ / sec · cm.

  The laser welding member obtained by injection molding the thermoplastic polyester resin material is subjected to laser welding. There is no restriction | limiting in particular in the method of laser welding, It can carry out by a normal method. The molded body (first member) obtained by injection molding of a thermoplastic polyester resin material is placed on the transmission side, and the resin molded body (second member, adherend) of the counterpart material is brought into contact (particularly at least welded). The two types of molded products are welded and integrated into a single molded product by irradiating a laser beam. And in this invention, the laser welding is carried out by using as a welding part a part at a distance of 15 mm or more from the gate of the injection mold. It is necessary that at least a part of the laser welding site is 15 mm or more away from the gate, but it is preferable that 30% or more of the total area of the laser welding site is 15 mm or more away from the gate, and more than 50% is more Preferably, 70% or more is more preferable, and it is particularly preferable that all the parts to be laser-welded are separated from the gate by 15 mm or more.

When the thermoplastic polyester resin material of the present invention is injection-molded, the variation in laser transmittance is large depending on the part (position) of the molded body, the transmittance is poor at a part near the gate position, and the distance from the gate becomes long. It has been clarified by the inventor's examination that excellent transmittance is exhibited. For example, as shown in the examples described later, it can be seen that the laser transmittance is low at a portion where the distance from the gate is as short as 10 mm, whereas the transmittance increases as the distance increases. The degree of improvement in the transmittance depends on the composition of the thermoplastic polyester resin material used, the thickness of the laser welded part, the injection molding conditions, and the like. However, the transmittance is high (for example, the transmittance material composition A to A in Table 2 in Examples below) It was found that with D, in particular with the transmissive material compositions A and B, extremely high transmittances can be achieved such that the transmittance is in the range of 50% to 60%, further 70% and over 80%.
Further, this transmittance is affected by the composition of the thermoplastic polyester resin material used, the thickness of the laser welding part, the injection molding conditions, etc., but in the present invention, the composition of the thermoplastic polyester resin material, the laser welding part Regardless of the thickness, injection molding conditions, etc., by making the light transmittance of laser beam with a wavelength of 940 nm at the laser welding part 30% or more, laser processability is improved and strong laser welding is possible It becomes.

  The shape of the laser welding member is not limited, and the distance from the gate of the injection mold is 15 mm or more, preferably 20 mm or more, more preferably 25 mm or more, more preferably 30 mm or more, particularly preferably 35 mm or more, and most preferably. As long as it has a welding part at a position separated by 40 mm or more, the entire shape may be any. Usually, the welded portion is joined to a mating material (another resin or a molded body of the same resin) and laser-welded, so the welded portion has a shape (for example, a plate shape) having at least a contact surface (such as a flat surface). . Moreover, the thickness of the laser welding part (part which irradiates a laser) can be selected from a wide range, Preferably it is 0.1-2 mm, More preferably, it is 0.3-1.5 mm, Furthermore, it is 0.5-1 mm. .

Although the size of the welding member is not limited, for example, a three-dimensional shape can be regarded as a planar shape and can be arbitrarily set in the range of 2 cm × 2 cm to 50 cm × 50 cm, preferably 3 cm × 3 cm to 50 cm × It is preferably in the range of 50 cm, more preferably in the range of 3 cm × 3 cm to 40 cm × 40 cm, still more preferably in the range of 3 cm × 3 cm to 35 cm × 35 cm, particularly in the range of 3 cm × 3 cm to 30 cm × 30 cm.
The number of gates may be plural, or a multipoint gate system may be used. The number of resin gates of the mold at the time of molding with respect to the surface area of the welding member is preferably 4 pieces / cm ² or less, more preferably 3 pieces / cm ² or less, and more preferably 2 pieces / cm ² or less. More preferably.

The laser welding portion preferably has a light transmittance of 35% or more in laser light having a wavelength of 940 nm, more preferably 40% or more, more preferably 45% or more, and even more preferably 50% or more. It is preferably 55% or more, particularly 60% or more, particularly 65% or more, and most preferably 70% or more.
Since the transmittance increases as the thickness of the molded body decreases, the composition of the thermoplastic polyester resin material to be used, the thickness of the molded body, the distance from the gate of the injection mold, and the injection are used in order to obtain the above-described preferable transmittance. The molding conditions such as the speed, injection rate, surface progression coefficient, resin temperature, and mold temperature may be adjusted as appropriate so that the laser welding portion has a higher transmittance.
In addition, the transmittance | permeability in this invention means the transmittance | permeability in the laser beam of wavelength 940nm.

  The crystallization temperature (Tc) at the site where laser welding is performed is preferably 190 ° C. or lower, more preferably 188 ° C. or lower, more preferably 185 ° C. or lower, particularly preferably 182 ° C. or lower, and most preferably 180 ° C. or lower. . Moreover, the minimum is 160 degreeC normally, Preferably it is 165 degreeC or more. The method for measuring the crystallization temperature (Tc) is as described in the examples.

  The welding portion of the welding member injection-molded with the thermoplastic polyester resin material and the counterpart member containing the laser light absorber are brought into surface contact or butt contact, and usually the above-mentioned welding with high transmittance By irradiating the laser beam from the member side, the interface between the two is at least partially melted and cooled to be integrated into one molded product.

  The member on the other side containing the laser light absorber is not particularly limited as long as it is a member made of a thermoplastic resin composition that can absorb laser light and is melted by absorbing the laser light. . Specifically, a member made of a resin composition that usually contains carbon black or a laser-absorbing dye in order to be able to absorb laser light is exemplified. Although content of absorbers, such as carbon black, is not specifically limited, For example, it is preferable to make it contain 0.2-1 mass% with respect to a resin composition.

Preferred examples of the laser light absorbing dye include nigrosine, aniline black, phthalocyanine, naphthalocyanine, porphyrin, perylene, quaterylene, azo dye, anthraquinone, squaric acid derivative and immonium.
Of these, nigrosine is particularly preferred. Nigrosine is C.I. I. SOLVENT BLACK 5 and C.I. I. It is a black azine-based condensation mixture as described in COLOR INDEX as SOLVEN BLACK 7. Examples of commercially available nigrosine include “NUBIAN (registered trademark) BLACK” (trade name, manufactured by Orient Chemical Industry Co., Ltd.).
The content of the laser light absorbing dye is 0.001 to 0.2 parts by mass, preferably 0.003 to 0.1 parts by mass, and more preferably 0.005 to 0 parts per 100 parts by mass of the resin component. 0.05 parts by mass.

  In order to obtain higher welding strength, it is preferable that both the members are the above thermoplastic polyester resin material, and the counterpart agent contains carbon black or a laser light absorbing dye. Since such a member has the same composition except for the presence or absence of carbon black or a laser light absorbing dye, the welded permeable resin member and the absorbing resin member are easily compatible and more firmly fixed.

  The type of laser light to be irradiated is arbitrary as long as it is near infrared laser light, such as YAG (yttrium, aluminum, garnet crystal) laser (wavelength 1064 nm), LD (laser diode) laser (wavelength 808 nm, 840 nm, 940 nm), etc. Can be preferably used. In particular, laser light having a wavelength of 940 nm is preferable.

  The shape, size, thickness, etc. of the molded product integrated by laser welding are arbitrary, and the use of the welded body includes electrical parts for transportation equipment such as automobiles, parts for electrical and electronic equipment, parts for industrial machinery, etc. It is particularly suitable for consumer parts.

As described above, the thermoplastic polyester resin material used in the present invention may contain other resins or additives.
As other resins, various thermoplastic resins can be contained, and examples thereof include aromatic vinyl resins such as polystyrene, butadiene rubber-containing polystyrene, and acrylonitrile-styrene copolymers, and polycarbonate resins. In the present invention, in order to achieve high laser transparency, it is preferable to use at least one resin selected from the group consisting of polycarbonate resin and polystyrene and / or butadiene rubber-containing polystyrene in combination with the thermoplastic polyester resin.

[Polycarbonate resin]
It is also preferable that the thermoplastic polyester resin material contains a thermoplastic polyester resin and a polycarbonate resin. By containing a specific amount of the polycarbonate resin, the laser weldability is easily improved, which is preferable.
The polycarbonate resin is an optionally branched thermoplastic polymer or copolymer obtained by reacting a dihydroxy compound or a small amount thereof with phosgene or a carbonic acid diester. The production method of the polycarbonate resin is not particularly limited, and those produced by a conventionally known phosgene method (interfacial polymerization method) or melting method (transesterification method) can be used. From the viewpoint of laser permeability and laser weldability, it is preferable.

  As the raw material dihydroxy compound, an aromatic dihydroxy compound is preferable, and 2,2-bis (4-hydroxyphenyl) propane (that is, bisphenol A), tetramethylbisphenol A, bis (4-hydroxyphenyl) -p-diisopropylbenzene, Hydroquinone, resorcinol, 4,4-dihydroxydiphenyl, etc. are mentioned, Preferably bisphenol A is mentioned. In addition, a compound in which one or more tetraalkylphosphonium sulfonates are bonded to the above aromatic dihydroxy compound can also be used.

  As the polycarbonate resin, among the above-mentioned, aromatic polycarbonate resin derived from 2,2-bis (4-hydroxyphenyl) propane, or 2,2-bis (4-hydroxyphenyl) propane and other aromatic dihydroxy Aromatic polycarbonate copolymers derived from the compounds are preferred. Further, it may be a copolymer mainly composed of an aromatic polycarbonate resin, such as a copolymer with a polymer or oligomer having a siloxane structure. Furthermore, you may mix and use 2 or more types of the polycarbonate resin mentioned above.

  In order to adjust the molecular weight of the polycarbonate resin, a monovalent aromatic hydroxy compound may be used. For example, m- and p-methylphenol, m- and p-propylphenol, p-tert-butylphenol, p-long chain And alkyl-substituted phenols.

  The viscosity average molecular weight of the polycarbonate resin is preferably 5,000 to 30,000, more preferably 10,000 to 28,000, and more preferably 14,000 to 24,000. When a material having a viscosity average molecular weight lower than 5,000 is used, the obtained welding member tends to have a low mechanical strength. On the other hand, if it is higher than 30,000, the fluidity of the resin material may be deteriorated and the moldability may be deteriorated or the laser weldability may be deteriorated. The viscosity average molecular weight of the polycarbonate resin is a viscosity average molecular weight [Mv] converted from a solution viscosity measured at a temperature of 25 ° C. using methylene chloride as a solvent.

  The ratio (Mw / Mn) of polystyrene-converted mass average molecular weight Mw and number average molecular weight Mn measured by gel permeation chromatography (GPC) of the polycarbonate resin is preferably 2 to 5, 2.5 ~ 4 is more preferred. When Mw / Mn is too small, the fluidity in the molten state increases and the moldability tends to decrease. On the other hand, if Mw / Mn is excessively large, the melt viscosity tends to increase and molding becomes difficult.

  The amount of terminal hydroxy groups of the polycarbonate resin is preferably 100 ppm by mass or more, more preferably 200 ppm by mass or more, and still more preferably 400 ppm by mass from the viewpoints of thermal stability, hydrolysis stability, color tone, and the like. As mentioned above, Most preferably, it is 500 mass ppm or more. However, it is usually 1,500 mass ppm or less, preferably 1,300 mass ppm or less, more preferably 1,200 mass ppm or less, and most preferably 1,000 mass ppm or less. When the amount of terminal hydroxy groups of the polycarbonate resin is too small, the laser transmittance tends to be lowered, and the initial hue at the time of molding may be deteriorated. When the amount of terminal hydroxy groups is excessively large, the residence heat stability and the moist heat resistance tend to decrease.

  As described above, as the polycarbonate resin, a polycarbonate resin produced by a melt polymerization method is preferable from the viewpoint of laser transmittance and laser weldability.

In the melt polymerization method, an ester exchange reaction between an aromatic dihydroxy compound and a carbonic acid diester is performed.
The aromatic dihydroxy compound is as described above.
On the other hand, examples of the carbonic acid diester include dialkyl carbonates such as dimethyl carbonate, diethyl carbonate, and di-tert-butyl carbonate; diphenyl carbonate; substituted diphenyl carbonate such as ditolyl carbonate; Among these, diaryl carbonate is preferable, and diphenyl carbonate is particularly preferable. In addition, 1 type may be used for carbonic acid diester, and it may use 2 or more types together by arbitrary combinations and a ratio.

  The ratio of the aromatic dihydroxy compound and the carbonic acid diester is arbitrary as long as the desired polycarbonate resin can be obtained, but it is preferable to use an equimolar amount or more of the carbonic acid diester with respect to 1 mol of the dihydroxy compound. More preferably, it is used. The upper limit is usually 1.30 mol or less. By setting it as such a range, the amount of terminal hydroxy groups can be adjusted to a suitable range.

  In the polycarbonate resin, the amount of terminal hydroxy groups tends to have a great influence on thermal stability, hydrolysis stability, color tone and the like. For this reason, you may adjust the amount of terminal hydroxy groups as needed by arbitrary well-known methods. In the transesterification reaction, a polycarbonate resin in which the amount of terminal hydroxy groups is adjusted can be usually obtained by adjusting the mixing ratio of the carbonic acid diester and the dihydroxy compound, the degree of vacuum during the transesterification reaction, and the like. In addition, the molecular weight of the polycarbonate resin usually obtained can also be adjusted by this operation.

When adjusting the amount of terminal hydroxy groups by adjusting the mixing ratio of the carbonic acid diester and the aromatic dihydroxy compound, the mixing ratio is as described above.
Further, as a more aggressive adjustment method, there may be mentioned a method in which a terminal terminator is mixed separately during the reaction. Examples of the terminal terminator at this time include monohydric phenols, monovalent carboxylic acids, carbonic acid diesters, and the like. In addition, 1 type may be used for a terminal terminator and it may use 2 or more types together by arbitrary combinations and a ratio.

  When producing a polycarbonate resin by the melt polymerization method, a transesterification catalyst is usually used. Any transesterification catalyst can be used. Among these, it is preferable to use an alkali metal compound and / or an alkaline earth metal compound. In addition, auxiliary compounds such as basic boron compounds, basic phosphorus compounds, basic ammonium compounds, and amine compounds may be used in combination. In addition, 1 type may be used for a transesterification catalyst and it may use 2 or more types together by arbitrary combinations and a ratio.

  In the melt polymerization method, the reaction temperature is usually 100 to 320 ° C. The pressure during the reaction is usually a reduced pressure condition of 2 mmHg or less (267 Pa or less). As a specific operation, a melt polycondensation reaction may be performed under the conditions in this range while removing by-products such as hydroxy compounds.

  The melt polycondensation reaction can be performed by either a batch method or a continuous method. In the case of a batch system, the order of mixing the reaction substrate, reaction medium, catalyst, additive, etc. is arbitrary as long as the desired polycarbonate resin is obtained, and an appropriate order may be set arbitrarily. However, in view of the stability of the polycarbonate resin and the resin material containing the polycarbonate resin, the melt polycondensation reaction is preferably carried out continuously.

In the melt polymerization method, a catalyst deactivator may be used as necessary. As the catalyst deactivator, a compound that neutralizes the transesterification catalyst can be arbitrarily used. Examples thereof include sulfur-containing acidic compounds and derivatives thereof. In addition, a catalyst deactivator may use 1 type and may use 2 or more types together by arbitrary combinations and a ratio.
The amount of the catalyst deactivator used is usually 0.5 equivalents or more, preferably 1 equivalent or more, and usually 10 equivalents or less, relative to the alkali metal or alkaline earth metal contained in the transesterification catalyst. Preferably it is 5 equivalents or less. Furthermore, it is 1 mass ppm or more normally with respect to polycarbonate resin, and is 100 mass ppm or less normally, Preferably it is 20 mass ppm or less.

  When the thermoplastic polyester-based resin material contains a thermoplastic polyester resin and a polycarbonate resin, the content of the polycarbonate resin is preferably 10-50 with respect to a total of 100% by mass of the thermoplastic polyester resin and the polycarbonate resin. It is mass%, More preferably, it is 15-45 mass%, More preferably, it is 20-40 mass%. If the content of the polycarbonate resin is less than 10% by mass, the laser welding strength tends to decrease, and if it exceeds 50% by mass, the moldability may be remarkably decreased.

[Aromatic vinyl resin]
The thermoplastic polyester resin material preferably contains a thermoplastic polyester resin and an aromatic vinyl resin.
The aromatic vinyl resin is a polymer mainly composed of an aromatic vinyl compound. Examples of the aromatic vinyl compound include styrene, α-methylstyrene, paramethylstyrene, vinyltoluene, and vinylxylene. Styrene is preferred. A typical example of the aromatic vinyl resin is polystyrene (PS).
As the aromatic vinyl resin, a copolymer obtained by copolymerizing an aromatic vinyl compound with another monomer can also be used. A typical example is an acrylonitrile-styrene copolymer in which styrene and acrylonitrile are co-polymerized.

As the aromatic vinyl resin, a rubber-containing aromatic vinyl resin obtained by copolymerizing or blending rubber components can also be preferably used. Examples of the rubber component include conjugated diene hydrocarbons such as butadiene, isoprene and 1,3-pentadiene. In the present invention, butadiene rubber is preferably used. An acrylic rubber component can be used as the rubber component, but it is not preferable because it is poor in terms of toughness.
When the rubber component is copolymerized or blended, the amount of the rubber component is usually 1% by mass or more and less than 50% by mass in the entire aromatic vinyl resin segment. The amount of the rubber component is preferably 3 to 40% by mass, more preferably 5 to 30% by mass, and further preferably 5 to 20% by mass.
As the rubber component-containing aromatic vinyl resin, rubber-containing polystyrene is preferable, butadiene rubber-containing polystyrene is more preferable, and high impact polystyrene (HIPS) is more preferable from the viewpoint of toughness.

  The aromatic vinyl resin preferably has a mass average molecular weight of 50,000 to 500,000, more preferably 100,000 to 400,000, and particularly preferably 150,000 to 300,000. If the molecular weight is less than 50,000, bleeding out is observed in the molded product, or decomposition gas is generated at the time of molding, and it is difficult to obtain sufficient weld strength. If the molecular weight is greater than 500,000, sufficient fluidity is obtained. It is difficult to improve the laser welding strength.

The aromatic vinyl resin preferably has a melt flow rate (MFR) measured at 200 ° C. and 98 N of 0.1 to 50 g / 10 minutes, more preferably 0.5 to 30 g / 10 minutes. Preferably, it is 1-20 g / 10min. If the MFR is less than 0.1 g / 10 minutes, the compatibility with the thermoplastic polyester resin becomes insufficient, and the appearance of delamination may occur during injection molding. On the other hand, if the MFR is larger than 50 g / 10 min, the impact resistance is greatly lowered, which is not preferable.
In particular, in the case of polystyrene, the MFR is preferably 1 to 50 g / 10 minutes, more preferably 3 to 35 g / 10 minutes, and further preferably 5 to 20 g / 10 minutes. In the case of butadiene rubber-containing polystyrene, the MFR is preferably 0.1 to 40 g / 10 minutes, more preferably 0.5 to 30 g / 10 minutes, and 1 to 20 g / 10 minutes. Further preferred.

  When the thermoplastic polyester resin material contains a thermoplastic polyester resin and an aromatic vinyl resin, the content is 100% by mass of the total amount of the thermoplastic polyester resin and the aromatic vinyl resin. The resin is preferably 10 to 50% by mass, more preferably 15 to 45% by mass, and still more preferably 20 to 40% by mass. If the content of the aromatic vinyl resin is less than 10% by mass, the laser welding strength tends to decrease, and if it exceeds 50% by mass, the heat resistance and heat discoloration may be decreased.

In particular, in the present invention, the thermoplastic polyester resin material preferably contains a thermoplastic polyester resin, polystyrene and / or butadiene rubber-containing polystyrene and polycarbonate resin from the viewpoint of laser weldability.
The polycarbonate resin is as described above.
Polystyrene is a copolymer of styrene homopolymer or other aromatic vinyl monomer such as α-methylstyrene, paramethylstyrene, vinyltoluene, vinylxylene, etc. within a range of, for example, 50% by mass or less. May be.

The butadiene rubber-containing polystyrene is a copolymerized or blended butadiene rubber component, and the amount of the butadiene rubber component is usually 1% by mass or more and less than 50% by mass, preferably 3 to 40% by mass, more Preferably it is 5-30 mass%, More preferably, it is 5-20 mass%. High impact polystyrene (HIPS) is particularly preferable as the butadiene rubber-containing polystyrene.
Among polystyrene or butadiene rubber-containing polystyrene, butadiene rubber-containing polystyrene is preferable, and high impact polystyrene (HIPS) is particularly preferable.

  The preferred mass average molecular weight and MFR of polystyrene or butadiene rubber-containing polystyrene are as described above.

When the thermoplastic polyester resin material contains a thermoplastic polyester resin, polystyrene and / or butadiene rubber-containing polystyrene and a polycarbonate resin, the crystallization temperature (Tc) of the obtained thermoplastic polyester resin material is 190 ° C. or lower. Is preferred. That is, laser transmissivity can be further improved by appropriately suppressing the transesterification reaction between the thermoplastic polyester resin and the polycarbonate resin and appropriately lowering the crystallization temperature. The crystallization temperature (Tc) is more preferably 188 ° C. or less, further preferably 185 ° C. or less, particularly preferably 182 ° C. or less, and most preferably 180 ° C. or less. Moreover, the minimum is 160 degreeC normally, Preferably it is 165 degreeC or more.
The method for measuring the crystallization temperature (Tc) is as described above.

The content when the thermoplastic polyester resin material includes a thermoplastic polyester resin, polystyrene and / or butadiene rubber-containing polystyrene and a polycarbonate resin is as follows.
The content of the thermoplastic polyester resin is preferably 30 to 90% by mass, and 40 to 80% by mass based on the total 100% by mass of the thermoplastic polyester resin, polystyrene and / or butadiene rubber-containing polystyrene and polycarbonate resin. More preferred is 50 to 70% by mass. When the content is less than 30% by mass, the heat resistance may be lowered, and when it exceeds 90% by mass, the transmittance tends to be lowered, which is not preferable.

  The content of polystyrene and / or butadiene rubber-containing polystyrene is preferably 1 to 50% by mass based on a total of 100% by mass of the thermoplastic polyester resin, polystyrene and / or butadiene rubber-containing polystyrene and polycarbonate resin. 45 mass% is more preferable, and 5-40 mass% is further more preferable. If the content is less than 1% by mass, the laser weldability and toughness may be poor, and if it exceeds 50% by mass, the heat resistance tends to be greatly reduced, which is not preferable.

  The content of the polycarbonate resin is preferably 1 to 50% by mass, more preferably 3 to 45% by mass, based on a total of 100% by mass of the thermoplastic polyester resin, polystyrene and / or butadiene rubber-containing polystyrene and polycarbonate resin. 5 to 40% by mass is more preferable. When the content is less than 1% by mass, the laser weldability is lowered, or the polystyrene and / or butadiene rubber-containing polystyrene is poorly dispersed, and the surface appearance of the molded product is likely to be lowered. If it exceeds 50% by mass, transesterification with the thermoplastic polyester resin proceeds, and the residence heat stability may decrease, which is not preferable.

  The total content of polystyrene and / or butadiene rubber-containing polystyrene and polycarbonate resin is 10 to 55% by mass in the total of 100% by mass of thermoplastic polyester resin, polystyrene and / or butadiene rubber-containing polystyrene and polycarbonate resin. Is preferable, 20-50 mass% is preferable, and 25-45 mass% is more preferable. By setting it as such content, it becomes the tendency which is excellent in the balance of heat resistance and laser transmittance, and is preferable.

  Furthermore, the content ratio of the polystyrene and / or butadiene rubber-containing polystyrene and the polycarbonate resin component is preferably 5: 1 to 1: 5, more preferably 4: 1 to 1: 4, in terms of mass ratio. By setting it as such a content rate, it exists in the tendency which is excellent in the balance of heat resistance and a laser transmittance, and is preferable.

[Other ingredients]
The thermoplastic polyester resin material used in the present invention may contain various additives as long as the effects of the present invention are not impaired. Such additives include stabilizers, mold release agents, reinforcing fillers, flame retardants, flame retardant aids, anti-dripping agents, UV absorbers, antistatic agents, antifogging agents, lubricants, antiblocking agents, plasticizers. Agents, dispersants, antibacterial agents and the like.

The thermoplastic polyester resin material used in the present invention preferably contains a flame retardant. Examples of flame retardants include halogen flame retardants, phosphorus flame retardants (such as melamine polyphosphate), nitrogen flame retardants (such as melamine cyanurate), metal hydroxides (such as magnesium hydroxide), In the present invention, brominated flame retardants are preferable as halogen-based flame retardants, brominated polycarbonates, brominated epoxy compounds, brominated poly (meth) acrylates and the like are more preferable, and particularly brominated polycarbonate based flame retardants are contained. It is preferable. In general, the transmittance is lowered when a halogen-based flame retardant is contained, but by containing it in combination with a brominated polycarbonate-based flame retardant and a nickel-containing colorant described later, good flame retardancy and laser The light-transmitting properties can be compatible, and the obtained molded body has low warpage, and strong laser welding can be achieved in a short welding time.
Such an effect is considered to depend on the fact that the brominated polycarbonate-based flame retardant phase is dispersed without extending as much as other flame retardants in the surface layer portion of the obtained molded body. The ratio of the major axis and minor axis of the brominated polycarbonate flame retardant phase at the surface layer is small, and the internal scattering of the laser light is small, so the transmittance is considered high.

  As brominated polycarbonate flame retardants, those conventionally known as brominated polycarbonate flame retardants can be used. Specifically, for example, brominated polycarbonate obtained from brominated bisphenol A, particularly tetrabromobisphenol A, can be used. It is preferable that Examples of the terminal structure include a phenyl group, 4-t-butylphenyl group, 2,4,6-tribromophenyl group, etc., and particularly those having a 2,4,6-tribromophenyl group in the terminal group structure. Is preferred.

  The average number of carbonate repeating units in the brominated polycarbonate flame retardant may be appropriately selected and determined, but is usually 2 to 30. If the average number of carbonate repeating units is small, the molecular weight of the thermoplastic polyester resin may be lowered during melting. On the other hand, if it is too large, it may cause dispersion failure in the molded body, and the appearance of the molded body, particularly glossiness, may be lowered. Therefore, the average number of repeating units is preferably 3 to 15, particularly 3 to 10.

The molecular weight of the brominated polycarbonate-based flame retardant is arbitrary and may be appropriately selected and determined. Preferably, the viscosity average molecular weight is 1,000 to 20,000, more preferably 1,500 to 15,000. It is preferable that it is 1,500-10,000.
The viscosity average molecular weight of the brominated polycarbonate flame retardant was determined by measuring the viscosity of the methylene chloride solution of the brominated polycarbonate resin at 20 ° C. using an Ubbelohde viscometer, and calculating the intrinsic viscosity ([η]). The value calculated from the viscosity equation of Schnell is shown.
[Η] = 1.23 × 10 ⁻⁴ Mv ^0.83

  The brominated polycarbonate flame retardant obtained from the brominated bisphenol A can be obtained by, for example, a usual method of reacting brominated bisphenol and phosgene. Examples of the end-capping agent include aromatic monohydroxy compounds, which may be substituted with a halogen or an organic group.

  The content of the brominated polycarbonate-based flame retardant is preferably 20 to 70 parts by mass, more preferably 25 parts by mass or more, still more preferably 30 parts by mass or more, especially 100 parts by mass of the thermoplastic polyester resin. It is 35 parts by mass or more, particularly preferably 40 parts by mass or more, more preferably 65 parts by mass or less, still more preferably 60 parts by mass or less, and particularly preferably 55 parts by mass or less. If the content of brominated polycarbonate flame retardant is too small, the flame retardancy of the thermoplastic polyester resin material will be insufficient, and the laser light transmission and laser weldability will be inferior. There is a problem of deterioration of moldability and bleed out of the flame retardant.

  In the present specification, the brominated polycarbonate flame retardant is different from the polycarbonate resin described above and is not included in the polycarbonate resin.

  The thermoplastic polyester resin material used in the present invention preferably contains a nickel-containing colorant as a colorant. By containing a nickel-containing colorant in combination with a brominated polycarbonate-based flame retardant, laser light transmission is good, strong laser welding is possible in a shorter welding time, and low warpage is also excellent. It has also been found that flame retardance is improved when a nickel-containing colorant is included.

  As the nickel-containing colorant, among various dyes (including pigments), nickel-containing dyes are used, preferably metal complex dyes or metal-containing dyes, and dyes in which complex salts are formed with nickel. Is preferred. Examples of the functional group of a complex salt dye that forms a complex salt with nickel include a hydroxyl group, a carboxyl group, an amino group, and the like. For example, an aromatic ring that surrounds an azo group or an azomethine group, such as an ortho ring of each benzene ring. Preferred examples include azo compounds having a functional group, azomethine compounds, and the like. Taking a monoazo dye as an example, a 1: 1 type metal complex dye having a Ni1 atom coordinated to one monoazo dye molecule and a 1: 2 type having a Ni1 atom coordinated to two monoazo dye (base material) molecules. There are metal complex dyes.

As a nickel-containing colorant, C.I. which is a Ni complex salt azo dye. I. SOLVENT Brown 53 is particularly preferable, and its chemical name is [2,3′-Bis [[(2-hydroxyphenyl) methylene] amino] but-2-enedinitrato (2-)-N2, N3, O2, O3] nickel. And the chemical structural formula is shown below.

  In addition, C.I. I. SOLVENT Brown 53 is also commercially available as a masterbatch, and it is also preferable to use eBIND LTW-8950H (trade name, manufactured by Orient Chemical Industry Co., Ltd.), which is a masterbatch with polybutylene terephthalate resin.

  The nickel content in the nickel-containing colorant is preferably 1 to 40% by mass, preferably 5% by mass or more, more preferably 10% by mass or more, preferably 30% by mass or less, more preferably 20%. It is below mass%. Below the lower limit, the flame retardancy may not be sufficiently improved, and heat discoloration tends to occur. Moreover, when it exceeds the said upper limit, when adjusting to black tone, blackness may be insufficient.

The content of the nickel-containing colorant is preferably 0.01 to 5 parts by mass, more preferably 0.03 parts by mass or more, and further preferably 0.06 parts by mass or more with respect to 100 parts by mass of the thermoplastic polyester resin. The amount is particularly preferably 0.1 parts by mass or more, more preferably 3 parts by mass or less, further preferably 2 parts by mass or less, and particularly preferably 1 part by mass or less. Below the lower limit, the flame retardancy may not be sufficiently improved, and heat discoloration tends to occur. If the above upper limit is exceeded, blackness may be insufficient in black toning.
The nickel content in the thermoplastic polyester resin material is preferably 0.001 to 1% by mass, more preferably 0.003% by mass or more, further preferably 0.006% by mass or more, and particularly preferably. 0.01% by mass or more, more preferably 0.8% by mass or less, further preferably 0.5% by mass or less, particularly preferably 0.3% by mass or less, and most preferably 0.1% by mass or less. . If the lower limit is not reached, the effect of improving flame retardancy may not be sufficient, and if the upper limit is exceeded, blackness may be insufficient when toning black.

  The thermoplastic polyester resin material used in the present invention may contain an antimony compound in order to further improve the flame retardancy. However, since containing an antimony compound leads to a decrease in laser light transmittance, when the antimony compound is contained, the content thereof preferably does not exceed 1% by mass in the resin composition.

Preferred examples of the antimony compound include antimony trioxide (Sb ₂ O ₃ ), antimony pentoxide (Sb ₂ O ₅ ), and sodium antimonate. Among these, antimony trioxide is preferable from the viewpoint of impact resistance.

  When the antimony compound is contained, the antimony compound is contained in the resin composition (the bromine atom derived from the brominated polycarbonate flame retardant and the antimony compound-derived mass concentration of the antimony compound are 3 to 25% by mass in total. It is preferably 4 to 22% by mass, more preferably 7 to 20% by mass, and if it is less than 3% by mass, the flame retardancy tends to decrease, and it exceeds 20% by mass. The mass ratio (Br / Sb) of bromine atom and antimony atom is preferably 1-15, more preferably 3-13, and 7-11. By setting it in such a range, there is little decrease in the laser transmittance, and it tends to be compatible with laser weldability and flame retardancy. There.

When it contains an antimony compound, it is preferably blended as a master batch with a thermoplastic polyester resin. As a result, the (E) antimony compound tends to be present in the thermoplastic polyester resin phase, and the impact resistance tends to be suppressed from decreasing.
The content of the antimony compound in the master batch is preferably 20 to 90% by mass. When the antimony compound is less than 20% by mass, the ratio of the antimony compound in the flame retardant masterbatch is small, and the effect of further improving the flame retardancy to the thermoplastic polyester resin containing the antimony compound is small. On the other hand, when the antimony compound exceeds 90% by mass, the dispersibility of the antimony compound is likely to be lowered, and if this is added to the thermoplastic polyester resin, the flame retardancy of the resin composition becomes unstable, and a masterbatch is produced. Workability at the time is also significantly reduced. For example, when manufacturing using an extruder, the strands are not stable, and problems such as easy breakage are likely to occur.
The content of the antimony compound in the master batch is preferably 30 to 85% by mass, more preferably 40 to 80% by mass, and still more preferably 50 to 80% by mass.

  The content in the case of containing an antimony compound is preferably 1 part by mass or less, more preferably 0.05 part by mass or more, and still more preferably 0. 0 part by mass with respect to 100 parts by mass of the thermoplastic polyester resin. 1 mass part or more, More preferably, it is 0.8 mass part or less, More preferably, it is 0.6 mass part or less, Most preferably, it is 0.4 mass part or less. By setting it as such content, it becomes difficult for a laser transmittance | permeability to fall and it exists in the tendency which is excellent in the balance of laser weldability and a flame retardance.

[Stabilizer]
The thermoplastic polyester resin material preferably contains a stabilizer.
Examples of the stabilizer include various stabilizers such as a phosphorus stabilizer, a sulfur stabilizer, and a phenol stabilizer. Particularly preferred are phosphorus stabilizers and phenolic stabilizers.

  Examples of phosphorus stabilizers include phosphorous acid, phosphoric acid, phosphite esters, and phosphate esters. Among them, organic phosphate compounds, organic phosphite compounds, or organic phosphonite compounds are preferable, and organic phosphate compounds are particularly preferable. .

The organic phosphate compound is preferably the following general formula:
(R ¹ O) _3-n P (═O) OH _n
(In the formula, R ¹ is an alkyl group or an aryl group, and may be the same or different. N represents an integer of 0 to 2.)
It is a compound represented by these.

In the above general formula, R ¹ is an alkyl group having 1 or more, preferably 2 or more, and usually 30 or less, preferably 25 or less, or an aryl group having 6 or more and usually 30 or less carbon atoms. More preferably, R ¹ is preferably an alkyl group rather than an aryl group. In addition, when two or more R ¹ exists, R ¹ may be the same or different from each other.
More preferably, R ¹ is a long-chain alkyl acid phosphate compound having 8 to 30 carbon atoms. Specific examples of the alkyl group having 8 to 30 carbon atoms include octyl group, 2-ethylhexyl group, isooctyl group, nonyl group, isononyl group, decyl group, isodecyl group, dodecyl group, tridecyl group, isotridecyl group, tetradecyl group, A hexadecyl group, an octadecyl group, an eicosyl group, a triacontyl group, etc. are mentioned.

  Examples of the long-chain alkyl acid phosphate include octyl acid phosphate, 2-ethylhexyl acid phosphate, decyl acid phosphate, lauryl acid phosphate, octadecyl acid phosphate, oleyl acid phosphate, behenyl acid phosphate, phenyl acid phosphate, nonyl phenyl acid phosphate Acid phosphate, phenoxyethyl acid phosphate, alkoxy polyethylene glycol acid phosphate, bisphenol A acid phosphate, dimethyl acid phosphate, diethyl acid phosphate, dipropyl acid phosphate, diisopropyl acid phosphate, dibutyl acid phosphate, geo Chill acid phosphate, di-2-ethylhexyl acid phosphate, dioctyl acid phosphate, dilauryl acid phosphate, distearyl acid phosphate, diphenyl acid phosphate, and a bis-nonylphenyl acid phosphate, or the like. Among these, octadecyl acid phosphate is preferable, and this is marketed under the trade name “ADEKA STAB AX-71” of ADEKA.

  In particular, when a thermoplastic polyester resin and a polycarbonate resin are included, the transesterification reaction between the two is moderately suppressed by the incorporation of the phosphorus-based stabilizer represented by the above general formula, and the crystal of the thermoplastic polyester resin material. The temperature tends to become 190 ° C. or less, and thereby the laser permeability and laser weldability are more likely to be improved.

  It is preferable that content of a phosphorus stabilizer is 0.001-1 mass part with respect to a total of 100 mass parts of thermoplastic polyester resin and the other resin contained as needed. When the content of the phosphorus stabilizer is less than 0.001 part by mass, it is difficult to expect improvement in the thermal stability and compatibility of the welding member, and the molecular weight and the hue deteriorate easily during molding. When it exceeds the part, it becomes an excessive amount, and there is a tendency that the generation of silver and the deterioration of hue are more likely to occur. The content of the phosphorus stabilizer is more preferably 0.01 to 0.6 parts by mass, and still more preferably 0.05 to 0.4 parts by mass.

  As the phenol stabilizer, a hindered phenol stabilizer is preferable. For example, pentaerythritol tetrakis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate], octadecyl-3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate, thiodiethylenebis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate], N, N′-hexane-1,6 -Diylbis [3- (3,5-di-tert-butyl-4-hydroxyphenylpropionamide), 2,4-dimethyl-6- (1-methylpentadecyl) phenol, diethyl [[3,5-bis ( 1,1-dimethylethyl) -4-hydroxyphenyl] methyl] phosphoate, 3,3 ′, 3 ″, , 5 ′, 5 ″ -hexa-tert-butyl-a, a ′, a ″-(mesitylene-2,4,6-triyl) tri-p-cresol, 4,6-bis (octylthiomethyl) -o -Cresol, ethylenebis (oxyethylene) bis [3- (5-tert-butyl-4-hydroxy-m-tolyl) propionate], hexamethylenebis [3- (3,5-di-tert-butyl-4- Hydroxyphenyl) propionate], 1,3,5-tris (3,5-di-tert-butyl-4-hydroxybenzyl) -1,3,5-triazine-2,4,6 (1H, 3H, 5H) -Trione, 2,6-di-tert-butyl-4- (4,6-bis (octylthio) -1,3,5-triazin-2-ylamino) phenol, 2- [1- (2-hydroxy-3) 5-di -tert- pentylphenyl) ethyl] -4,6-di -tert- pentylphenyl acrylate.

Among them, pentaerythritol tetrakis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate], octadecyl-3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate preferable. As such a phenolic antioxidant, specifically, for example, “Irganox 1010”, “Irganox 1076” manufactured by BASF (trade name, the same applies hereinafter), “Adeka Stub AO-50” manufactured by ADEKA, "ADK STAB AO-60" etc. are mentioned.
In addition, 1 type may be contained for the hindered phenol type stabilizer, and 2 or more types may be contained in arbitrary combinations and ratios.

  It is preferable that content of a phenol-type stabilizer is 0.01-1 mass part with respect to a total of 100 mass parts of thermoplastic polyester resin and the other resin contained as needed. If the content is less than 0.01 parts by mass, the thermal stability tends to be reduced, and if it exceeds 1 part by mass, the laser transmittance may be reduced. More preferable content is 0.05-0.8 mass part, More preferably, it is 0.1-0.6 mass part.

  In the present invention, it is preferable to use a phosphorus-based stabilizer and a phenol-based stabilizer, which are represented by the above general formula, from the viewpoints of retention characteristics, heat resistance, laser transmittance, and laser weldability.

[Release agent]
It is preferable that the thermoplastic polyester resin material further contains a release agent. As the mold release agent, known mold release agents usually used for polyester resins can be used. Among them, one or more mold release agents selected from polyolefin compounds, fatty acid ester compounds, and silicone compounds are used. preferable.

  Examples of the polyolefin compound include compounds selected from paraffin wax and polyethylene wax. Among them, those having a mass average molecular weight of 700 to 10,000, more preferably 900 to 8,000 are preferable. In addition, modified polyolefin compounds in which a hydroxyl group, a carboxyl group, a hydroxyl group, an epoxy group, or the like is introduced into the side chain are also particularly preferable.

  Examples of the fatty acid ester compounds include fatty acid esters such as glycerin fatty acid esters, sorbitan fatty acid esters, pentaerythritol fatty acid esters, and partially saponified products thereof. Among them, carbon atoms are 11 to 28, preferably carbon atoms. Mono- or di-fatty acid esters composed of fatty acids of several 17 to 21 are preferred. Specific examples include glycerol monostearate, glycerol monobehenate, glycerol dibehenate, glycerol-12-hydroxy monostearate, sorbitan monobehenate, pentaerythritol distearate, pentaerythritol tetrastearate and the like.

  Moreover, as a silicone type compound, the compound modified | denatured from points, such as compatibility with a thermoplastic polyester resin, is preferable. Examples of the modified silicone oil include silicone oil in which an organic group is introduced into the side chain of polysiloxane, silicone oil in which an organic group is introduced into both ends and / or one end of polysiloxane, and the like. Examples of the organic group to be introduced include an epoxy group, an amino group, a carboxyl group, a carbinol group, a methacryl group, a mercapto group, and a phenol group, and preferably an epoxy group. As the modified silicone oil, a silicone oil in which an epoxy group is introduced into the side chain of polysiloxane is particularly preferable.

  It is preferable that content of a mold release agent is 0.05-2 mass parts with respect to a total of 100 mass parts of a thermoplastic polyester resin and the other resin contained as needed. If the amount is less than 0.05 parts by mass, the surface property tends to decrease due to defective mold release at the time of melt molding. On the other hand, if it exceeds 2 parts by mass, the workability of kneading the resin material decreases, and the molded product There may be cloudiness on the surface. The content of the release agent is preferably 0.1 to 1.5 parts by mass, more preferably 0.3 to 1.0 parts by mass.

[Reinforcing filler]
It is also preferable that the thermoplastic polyester resin material further contains a reinforcing filler.
As the reinforcing filler, a conventional inorganic filler for plastics can be used. Preferably, fibrous fillers such as glass fiber, carbon fiber, basalt fiber, wollastonite and potassium titanate fiber can be used. In addition, granular or amorphous fillers such as calcium carbonate, titanium oxide, feldspar minerals, clays, organic clays, glass beads; plate-like fillers such as talc; scale-like fillers such as glass flakes, mica and graphite A material can also be used.
Of these, glass fibers are preferably used from the viewpoints of laser light permeability, mechanical strength, rigidity, and heat resistance.

  More preferably, the reinforcing filler is surface-treated with a surface treatment agent such as a coupling agent. The glass fiber to which the surface treatment agent is attached is preferable because it is excellent in durability, heat and humidity resistance, hydrolysis resistance, and heat shock resistance.

As the surface treatment agent, any conventionally known one can be used. Specifically, for example, silane coupling agents such as amino silane, epoxy silane, allyl silane, and vinyl silane are preferable.
Among these, aminosilane-based surface treatment agents are preferable, and specifically, for example, γ-aminopropyltriethoxysilane, γ-aminopropyltrimethoxysilane, and γ- (2-aminoethyl) aminopropyltrimethoxysilane are preferable. Take as an example.

Moreover, as a surface treating agent, epoxy resins, such as a novolac type, a bisphenol A type epoxy resin, etc. are mentioned preferably. Of these, bisphenol A type epoxy resins are preferred.
The silane-based surface treatment agent and the epoxy resin may be used alone or in combination, and it is also preferable to use both in combination.

From the viewpoint of laser weldability, the glass fiber is also preferably a glass fiber having an anisotropic cross-sectional shape in which the ratio of the major axis to the minor axis is 1.5 to 10.
The cross-sectional shape is preferably an oval, elliptical, or eyebrow-shaped cross section, and particularly preferably an oval cross section. Further, those having a major axis / minor axis ratio of 2.5 to 8, more preferably 3 to 6 are preferred. Furthermore, when the major axis of the cross section of the glass fiber in the molded product is D2, the minor axis is D1, and the average fiber length is L, the aspect ratio ((L × 2) / (D2 + D1)) is preferably 10 or more. When such a flat glass fiber is used, warping of the molded product is suppressed, which is particularly effective when a box-shaped welded body is manufactured.

  The content of the reinforcing filler is 0 to 100 parts by mass with respect to a total of 100 parts by mass of the thermoplastic polyester resin and other resins contained as necessary. When the content of the reinforcing filler exceeds 100 parts by mass, the fluidity and laser weldability are deteriorated, which is not preferable. The more preferable content of the reinforcing filler is 5 to 90 parts by mass, more preferably 15 to 80 parts by mass, still more preferably 20 to 70 parts by mass, and particularly preferably 30 to 60 parts by mass.

[Manufacture of thermoplastic polyester resin materials]
As a manufacturing method of the thermoplastic polyester-type resin material of this invention, it can carry out in accordance with the conventional method of resin composition preparation. Usually, the components and various additives added as desired are mixed together and then melt-kneaded in a single-screw or twin-screw extruder. Moreover, it is also possible to prepare the resin material of the present invention without mixing each component in advance, or by mixing only a part of the components in advance and supplying them to an extruder using a feeder and melt-kneading them.
Further, a master batch is prepared by melt-kneading a thermoplastic polyester resin and, if necessary, a part of the other resin contained therein with a part of the other ingredients, and then adding the remaining part to the other batch. The components may be blended and melt-kneaded.
In addition, when using fibrous reinforcement fillers, such as glass fiber, it is also preferable to supply from the side feeder in the middle of the cylinder of an extruder.

  The heating temperature at the time of melt kneading can be appropriately selected from the range of usually 220 to 300 ° C. If the temperature is too high, decomposition gas is likely to be generated, which may cause opacity. Therefore, it is desirable to select a screw configuration in consideration of shear heat generation.

  The molded article for laser welding formed by molding the thermoplastic polyester resin material used in the present invention preferably forms a matrix phase in which the thermoplastic polyester resin is continuous in the surface layer portion of the molded article, and the brominated polycarbonate difficult The phase of the flame retardant is present dispersed in the continuous phase of the thermoplastic polyester resin, and the ratio of the major axis to the minor axis (major axis / minor axis) of the brominated polycarbonate flame retardant phase is preferably in the range of 1 to 5. The brominated polycarbonate-based flame retardant phase disperses without extending as much as other flame retardants, so the ratio of the major axis to the minor axis is small, so the internal scattering of the laser beam is small and the laser beam transmission is improved. It is done. The ratio of major axis / minor axis is more preferably 1.2-4, and still more preferably 1.4-3.

The morphology of such a molded body can be measured by observing the cross section of the molded body with an optical microscope, SEM (scanning electron microscope), TEM (transmission electron microscope), etc., preferably, a scanning electron microscope ( Observed by SEM).
Specifically, using a SEM / EDS analyzer, the surface of the molded body (depth less than 20 μm) was observed with a backscattered electron image with a magnification of 1,500 to 100,000 under an acceleration voltage of 1.5 to 2 kV. The

  FIG. 3 shows an example of the morphology of the molded article of the present invention. A photograph of a backscattered electron image by SEM / EDS analysis of the surface layer portion of the molded article obtained in Example 20 described later (magnification: 3,000 times) ). In FIG. 3, the black gray continuous phase (matrix phase) is composed of a polybutylene terephthalate resin phase, among which a slightly thin white flat is a dispersed phase of a brominated polycarbonate flame retardant. It is confirmed that the brominated polycarbonate flame retardant is dispersed in the continuous phase of the polybutylene terephthalate resin.

  The major axis and minor axis of the brominated polycarbonate flame retardant phase can be read from the image obtained by the backscattered electron image by emphasizing the contrast, adjusting the brightness or adjusting both, and brominating the image. The length of 50 or more polycarbonate flame retardant phases is measured, and the major axis / minor axis is calculated from the average value. The major axis refers to the maximum length of the flame retardant phase, and the minor axis refers to the shortest diameter among the lengths perpendicular to the major axis. The ratio of the major axis to the minor axis (major axis / minor axis) of the brominated polycarbonate flame retardant phase of Reference Example 1 was 2.7.

By having such a unique morphological structure as described above, it is possible to obtain a molded article which is excellent in laser light transmittance and excellent in balance between laser weldability and flame retardancy and low warpage.
The thermoplastic polyester resin material used in the present invention is preferably produced by a melt-kneading method using a melt-kneader such as an extruder, but the above morphological structure is obtained simply by mixing the raw materials and simply kneading. Is difficult to form stably, and kneading by a special method is recommended.
Hereinafter, a preferable production method for stably forming such a morphological structure in the case where a polybutylene terephthalate resin is contained as a main component as a thermoplastic polyester resin will be described.

After mixing polybutylene terephthalate resin, brominated polycarbonate-based flame retardant, nickel-containing colorant and other ingredients blended as required at a predetermined ratio, supply it to a single-screw or twin-screw extruder equipped with a die nozzle Then, after melt-kneading and extruding a resin composition from a die nozzle to form a strand, it is cut to produce pellets.
At this time, it is preferable to use a twin screw extruder as the melt kneader. Especially, it is preferable that L / D which is the ratio of the screw length L (mm) to the diameter D (mm) of the screw satisfies the relationship of 15 <(L / D) <100, and 20 <(L / D) It is more preferable to satisfy <80. When the ratio is 15 or less, the major axis / minor axis ratio of the brominated polycarbonate flame retardant phase in the surface layer of the molded article is unlikely to be in the range of 1 to 5, and conversely, even when the ratio is 100 or more, the heat of the brominated polycarbonate flame retardant It is not preferable because deterioration may be remarkable.
The shape of the die nozzle is not particularly limited, but a circular nozzle having a diameter of 1 to 10 mm is preferable, and a circular nozzle having a diameter of 2 to 7 mm is more preferable in terms of pellet shape.

  In addition, when supplying raw materials to a melt-kneader such as an extruder, prior to melt-kneading, a brominated polycarbonate-based flame retardant, a nickel-containing colorant and other components blended as necessary are pre-blended, It is preferable to supply this preliminary blend to a melt kneader such as an extruder from a feeder provided separately from the polybutylene terephthalate resin. When a nickel-containing colorant is blended as a master touch, it is pre-blended with polybutylene terephthalate resin and supplied from a separate blender and a separate feeder to a melt kneader such as an extruder. Is preferred. By adopting such a supply method, the major axis / minor axis ratio of the brominated polycarbonate-based flame retardant phase in the surface layer of the molded body is likely to be in the range of 1 to 5, and it becomes easier to achieve both laser weldability and flame retardancy. preferable.

  Moreover, it is preferable that the melting temperature of the resin composition at the time of melt-kneading is 200-330 degreeC, and it is more preferable that it is 220-315 degreeC. When the melting temperature is less than 200 ° C., melting is insufficient and unmelted gel tends to occur frequently. Conversely, when it exceeds 330 ° C., the resin composition is undesirably thermally deteriorated and easily colored.

The screw rotation speed during melt kneading is preferably 50 to 1,200 rpm, and more preferably 80 to 1,000 rpm. If the screw rotation speed is less than 50 rpm, the major axis / minor axis ratio of the brominated polycarbonate flame retardant phase in the surface layer of the molded product tends to be difficult to be in the range of 1 to 5, and if it exceeds 1,200 rpm, an antimony compound is included. In such a case, the antimony compound is likely to aggregate and the laser light transmittance and mechanical properties may be deteriorated.
The discharge rate is preferably 10 to 2,000 kg / hr, and more preferably 15 to 1,800 kg / hr. When the discharge amount is within the above range, the major axis / minor axis ratio of the brominated polycarbonate-based flame retardant phase in the surface layer of the molded product tends to be in the range of 1 to 5, and when an antimony compound is included, it is due to aggregation of the ammon compound. It is preferable that the laser beam permeability and mechanical properties are not deteriorated.

Shear rate of the resin composition in the die nozzle is preferably 50～10,000Sec ^-1, more preferably 70～5,000Sec ^-1, more preferably from 100～1,000Sec ^-1 . Such shear rate is generally determined from the discharge amount of the resin composition and the shape of the cross section of the die nozzle. For example, when the cross section of the die nozzle is circular, it can be calculated by γ = 4Q / πr ^3. it can. Here, γ represents the shear rate (sec ⁻¹ ), Q represents the discharge amount (cc / sec) of the resin composition per die nozzle, and r represents the radius (cm) of the die nozzle cross section.

  The resin composition extruded in a strand form from the die nozzle is cut into a pellet shape by a pelletizer or the like. In the present invention, the surface temperature of the strand during cutting is preferably 30 to 150 ° C., more preferably 35 to 135. It is preferable to cool the strands at a temperature of, preferably 40 to 110 ° C., particularly preferably 45 to 100 ° C. Usually, it is cooled by a method such as air cooling or water cooling, but water cooling is preferable in terms of cooling efficiency. In such water cooling, the strand may be cooled in a water tank containing water, and a desired strand surface temperature can be obtained by adjusting the water temperature and the cooling time. The shape of the pellets thus produced is preferably 1 to 9 mm, more preferably 2 to 8 mm, still more preferably 3 to 6 mm, and preferably 1 to 11 mm in length in the case of a cylindrical shape. Is 2 to 8 mm, more preferably 3 to 6 mm.

The relationship between the shear rate γ (sec ⁻¹ ) in the die nozzle and the surface temperature T (° C.) of the strand at the time of strand cutting is as follows:
1.5 × 10 ³ <(γ · T) <1.5 × 10 ⁶
By satisfying the above relationship, the major axis / minor axis ratio of the brominated polycarbonate flame retardant phase in the surface layer of the molded article is likely to be in the range of 1 to 5, and it becomes easier to achieve both the laser weldability and the flame retardancy. Further, when the value of (γ · T) is 1.5 × 10 ³ or less, the surface of the molded product is liable to cause rough skin due to poor dispersion of each component of the resin composition, laser light permeability, flame retardancy, Mechanical properties tend to be unstable. On the other hand, even if it exceeds 1.5 × 10 ⁶ , when an antimony compound is contained, the antimony compound may be aggregated and the laser light transmittance and mechanical properties may be deteriorated. The lower limit of (γ · T) is more preferably 3.3 × 10 ³ , and the upper limit is more preferably 9.5 × 10 ⁵ .
In order to adjust the value of (γ · T) within the above range, the shear rate and the surface temperature of the strand may be adjusted.

  In the present invention, a thermoplastic polyester resin material having the above-described morphological structure can be produced by applying the above-mentioned preferable conditions alone or in combination, and among them, (γ · T) It is effective to adopt a manufacturing condition such that the value satisfies the above formula.

  By adopting such a method for producing a thermoplastic polyester resin material, it becomes easy to stably produce a laser-welded molded article having the above-described morphological structure. However, the method for producing a molded body having the above-described morphological structure is not limited to such a method, and other methods may be used as long as the above-described preferable morphological structure is obtained.

  In addition, in order to easily form a molded body having the above-described morphological structure, a molded body is produced using a thermoplastic polyester resin composition to which the following methods and conditions 1) to 3) are applied. It is also preferable.

1) When an antimony compound is included, antimony trioxide is used and blended as a master batch with a thermoplastic polyester resin. Thereby, it becomes easy to form the above-mentioned preferable morphological structure stably.

2) The content of chlorine compounds as impurities in the brominated polycarbonate flame retardant is usually 0.3% by mass or less, preferably 0.2% by mass or less, more preferably 0.15% by mass or less, and further 0 0.08% by mass or less, particularly 0.03% by mass or less is preferable. By controlling in this way, it becomes easy to form the above-mentioned preferable morphological structure stably.
The chlorinated compound which is an impurity is, for example, a chlorinated bisphenol compound, and when the chlorinated bisphenol compound is present in the above amount or more, it is difficult to stably form the preferred morphological structure of the present invention. The chlorine compound content can be quantified as a value in terms of decane by analyzing a gas generated by heating at 270 ° C. for 10 minutes by a gas chromatography method.

3) Setting the amount of free bromine, chlorine, and sulfur in the thermoplastic polyester resin material to a specific amount or less is also effective for easily forming a preferable morphological structure. The amount of free bromine is preferably 800 ppm by mass or less, more preferably 700 ppm by mass or less, further preferably 650 ppm by mass or less, and particularly preferably 480 ppm by mass or less. Moreover, since removing the content up to 0 mass ppm requires purification so as not to be economical, the lower limit is usually 1 mass ppm, preferably 5 mass ppm, more Preferably it is 10 mass ppm.
The amount of free chlorine is preferably 500 ppm by mass or less, more preferably 350 ppm by mass or less, further preferably 200 ppm by mass or less, and particularly preferably 150 ppm by mass or less. The chlorine content in the thermoplastic polyester resin material is not limited in what state and form the chlorine is present in the resin composition. Since chlorine is mixed from various environments such as raw materials, additives, catalysts, polymerization atmosphere, resin cooling water, etc., it is preferable to control the total amount of mixing to 500 ppm by mass or less.
Further, the amount of free sulfur is preferably 250 ppm by mass or less, more preferably 200 ppm by mass or less, further preferably 150 ppm by mass or less, and particularly preferably 100 ppm by mass or less. It should be noted that the sulfur content in the thermoplastic polyester resin material is not limited in what state and form sulfur is present in the resin composition. Since sulfur is mixed in from various environments such as raw materials, additives, catalysts, polymerization atmospheres, etc., it is preferable to control the total amount of mixing to 250 ppm by mass or less.

  The content of free bromine, chlorine and sulfur in the thermoplastic polyester resin material can be measured by a combustion ion chromatography method. Specifically, using an automatic sample combustion apparatus of “AQF-100 type” manufactured by Mitsubishi Chemical Analytech Co., Ltd., the resin composition is heated under an argon atmosphere at 270 ° C. for 10 minutes, and the generated bromine, chlorine, The amount of sulfur can be determined by quantifying using “ICS-90” manufactured by Nippon Dionex.

  These methods and conditions of 1) to 3) may be applied alone or in combination, and may be more possible by applying in combination with the production conditions of the thermoplastic polyester resin material described above. Become.

  In the injection molding, in order to obtain a molded body having the above preferred morphological structure, for example, the screw configuration of the injection molding machine, the processing of the inner wall of the screw or cylinder, the selection of molding machine conditions such as the nozzle diameter, the mold structure, the plasticity, etc. Various methods such as adjustment of molding conditions such as conversion, measurement, injection, etc., addition of other components to the molding material, and the like can be mentioned. In particular, it is preferable to adjust, for example, cylinder temperature, back pressure, screw rotation speed, injection speed, and the like as conditions during plasticization, measurement, and injection. For example, when adjusting the cylinder temperature, it is preferably set to 230 to 280 ° C, more preferably 240 to 270 ° C. When adjusting the back pressure, it is preferably set to 2 to 15 MPa, more preferably 4 to 10 MPa. When adjusting a screw rotation speed, Preferably it sets to 20-300 rpm, More preferably, it sets to 20-250 rpm. When adjusting the injection speed, it is preferably set to 5 to 1,000 mm / sec, more preferably 10 to 900 m / sec, still more preferably 20 to 800 mm / sec, and 30 to 500 mm / sec.

  The molded body of the obtained thermoplastic polyester resin material is subjected to laser welding. There is no restriction | limiting in particular in the method of laser welding, It can carry out by a normal method. The molded body (first member) of the thermoplastic polyester resin material is made the transmission side, and the counterpart resin molded body (second member, adherend) is contacted (particularly at least the welded portion is in surface contact), By irradiating with laser light, two types of molded products are welded and integrated into one molded product.

EXAMPLES Hereinafter, although an Example is shown and this invention is demonstrated more concretely, this invention is limited to a following example and is not interpreted.
In the following Examples and Comparative Examples, the components used are as shown in Table 1 below.

[Manufacture of welding laser transmitting material]
Each component described in Table 1 above was blended in the amounts (all parts by mass) described as the permeation material compositions A to G in Table 2 below, and this was blended at 250 ° C. using a 30 mm vent type twin screw extruder. After kneading and extruding the strand, pellets of the permeation material compositions A to G were obtained.
The crystallization temperature (Tc) of the resin composition was determined by using a differential scanning calorimetry (DSC) machine (“Pyris Diamond” manufactured by PerkinElmer) under a nitrogen atmosphere to a temperature increase rate of 20 ° C./min to 30 to 300 ° C. The temperature was measured as the peak top temperature of the exothermic peak observed when the temperature was decreased at a temperature decrease rate of 20 ° C./min.
The results are shown in Table 2.

Further, using a melt indexer manufactured by Takara Industries Co., Ltd., the obtained pellets were dried at 120 ° C. for 5 hours, and then melted per unit time measured under the conditions of 250 ° C., a load of 5 kgf or 280 ° C., and a load of 2.16 kgf. flow volume MVR ^(unit: cm 3 / 10min) was measured.
The results are shown in Table 2.

After the obtained pellets of the above-described permeable material compositions A to G were dried at 120 ° C. for 5 hours, the cylinder temperature was 255 ° C., the mold temperature was 60 ° C. with an injection molding machine (NEX80-9E, manufactured by Nissei Plastic Industry Co., Ltd.) Injection molding was performed at an injection speed of 73 mm / sec and an injection rate of 48 cm ³ / sec to produce three types of molded products having a length of 60 mm × width of 60 mm, a thickness of 0.75 mm, 1 mm, and 1.5 mm.
In addition, the actual mold temperature was measured during production. There are two measurement sites on the movable side and the fixed side of the mold, and the molded product is a location with a distance of 15 mm from the film gate 1 as shown in FIG. When the mold surface temperature was measured with a contact mold thermometer, it was confirmed to be within a range of 60 ± 3 ° C.
From the obtained molded product, as shown in FIG. 1, from the positions where the distance from the film gate 1 is 10 mm, 25 mm and 40 mm, the transmission material 1 (part-1) to the transmission material 3 (width 10 mm × length 40 mm) Site 3) was excised.
Further, the same as above except that the injection speed was changed to 100 mm / sec and the injection rate of 66 cm ³ / sec, and the distance from the film gate 1 was 10 mm, 25 mm and 40 mm from the position of the transparent material 1 (part-1) to The permeable material 3 (part-3) was cut out. In addition, 4 in FIG. 1 shows the laser irradiation location in the laser welding evaluation mentioned later.

The transmittance (unit:%) at a wavelength of 940 nm was measured using a spectrophotometer (“UV-3100PC” manufactured by Shimadzu Corporation) for the laser transmittance at the center of each transmitting material obtained above.
The results are shown in Table 2.

[Laser welding evaluation]
(Examples 1-15, Comparative Examples 1-13)
Among the permeation materials described in Table 2 obtained above, the permeation material composition and the parts described in Table 3 (thickness 1 mm) and Table 4 (thickness 1.5 mm) at a thickness of 1 mm and 1.5 mm, The following laser welding tests were conducted with each of the transmission materials of injection speed, injection rate, surface progression coefficient, and transmittance as the transmission side.
Except for using the resin composition for a laser absorbing material having the following composition, pellets obtained in the same manner as the above-described transmitting material were used. The cylinder temperature was 255 ° C., the mold temperature was 60 ° C., the injection speed was 73 mm / sec, and the injection rate was 48 cm. ^{Under the conditions of 3} / sec and surface progression coefficient: 480 cm ³ / sec · cm, a molded product having the same length of 60 mm × width of 60 mm × thickness of 1 mm as that of the transmission material was molded. What cut out part-2 like the above-mentioned penetration material from the molded article obtained was used as a member for laser absorption (absorption material A).
Polybutylene terephthalate resin Novaduran (registered trademark, manufactured by Mitsubishi Engineering Plastics) 5008: 67.4% by mass
Glass fiber T-187 (Nippon Electric Glass Co., Ltd.): 30% by mass
Stabilizer Adekasizer EP-17 (manufactured by ADEKA): 0.4% by mass
Stabilizer ADK STAB AO-60 (manufactured by ADEKA): 0.2% by mass
Carbon black mass batch (80% by mass for NOVADURAN 5008, 20% by mass for carbon black): 2% by mass

As shown in FIG. 2, the transmitting material and the absorbing material were superposed and laser irradiation was performed. 2, (a) shows a view of the permeable material and the absorbent material as viewed from the side, and (b) shows a view of the permeable material and the absorbent material as seen from above. 2 is the laser transmitting material 1 to 3 (width 10 mm, length 40 mm, thickness 0.75 mm, 1 mm, and 1.5 mm), and 3 is the laser absorbing material (width 10 mm, length) which is the counterpart material to be welded. 40 mm, thickness 1 mm), and 4 indicate laser irradiation locations.
The transmissive material 2 and the absorbent material 3 were overlapped as shown in FIG. 2 and irradiated with laser light from the transmissive material 2 side.

  Laser welding uses a fine device laser device (laser 140W, fiber core diameter 0.6 mm), laser wavelength: 940 nm, laser scan speed: 40 mm / second, scan length: 10 mm, laser output: 20 W (thickness 1 mm) Alternatively, 50 W (thickness: 1.5 mm), pressurization: 0.4 MPa, and distance between the laser head and the transmissive material 2: 79.7 mm.

Laser welding strength of the welded body was measured. The welding strength is measured by using a tensile tester (Instron “5544”) and sandwiching the permeation material 2 and the absorbent material 3 which are integrated by welding, with clamps at both ends in the long axis direction. Evaluation was made by pulling at a pulling speed of 5 mm / min. The laser welding strength is indicated by the tensile shear fracture strength of the welded portion.
The results of the welding test are shown in Tables 3, 4 and 5 below.

(Examples 16 to 18)
Except for using the resin composition for a laser absorbing material having the composition described in Table 6 below, pellets obtained in the same manner as the above-described transmitting material were used, the cylinder temperature was 255 ° C., the mold temperature was 60 ° C., and the injection speed was 73 mm. / Mm, injection rate of 48 cm ³ / sec, and surface progression coefficient: 480 cm ³ / sec · cm The same molded product of 60 mm in length, 60 mm in width, and 1 mm in thickness as the above-mentioned permeable material was molded. What cut out the part of the part-2 similarly to the said permeation | transmission material from the obtained molded article was used as a member for laser absorption (absorbing material BD).

Table 7 below shows the results of a welding test in which the absorbent material B to D was laser welded to the transmission material (part-2) of the transmission material composition A in the same manner as in Example 1.

(Examples 19 to 21)
Each component described in Table 8 below was used.

In each component described in Table 8 above, each component other than polybutylene terephthalate resin, nickel-containing colorant masterbatch and glass fiber was blended in advance in a blender in the amount (parts by mass) described in Table 9 below (Blend) Thing 1). Further, the polybutylene terephthalate resin and the nickel-containing colorant master batch were also blended in advance with a blender in an amount (parts by mass) shown in Table 8 (blend product 2). The obtained blend 1 and blend 2 are supplied to the hopper from the two independent feeders so as to have the ratio (parts by mass) shown in Table 8, which is a 30 mm vent type biaxial Glass fiber is supplied from the seventh side feeder from the hopper using an extruder (manufactured by Nippon Steel Works, “TEX30α”), the extruder barrel set temperatures C1 to C15 are 270 ° C., the die is 260 ° C., and the discharge is 80 kg. / Hr, screw rotation speed of 280 rpm, nozzle number of 5 holes (circular (φ4 mm), length of 1.5 cm), shear rate (γ) of 664 sec ⁻¹ , melt-kneading and extrusion into a strand. The strand temperature immediately after extrusion was 275 ° C.
The extruded strand was introduced into a water bath whose temperature was adjusted to a range of 40 to 80 ° C. and cooled. The strand surface temperature (T) is cooled to 110 ° C. at a temperature measured with an infrared thermometer (γ · T = 7.3 × 10 ⁴ ), inserted into a pelletizer, and cut to obtain a polybutylene terephthalate resin composition. Pellets were obtained.

  The characteristics of the obtained resin composition pellets were as follows, except for those specifically mentioned, using an injection molding machine (manufactured by Nippon Steel Works, J-85AD), cylinder temperature 255 ° C., mold temperature 80 ° C., injection pressure 150 MPa, The following test pieces injection-molded under the conditions of injection holding time 15 sec, cooling time 15 sec, injection speed 65 mm / sec, back pressure 5 MPa, screw rotation speed 100 rpm were evaluated. In molding, the resin composition pellets were dried at 120 ° C. for 6 to 8 hours until immediately before.

After the pellets of the resin composition obtained by the above method were dried at 120 ° C. for 6 hours, the cylinder temperature was 255 ° C., the mold temperature was 60 ° C. with an injection molding machine (NEX80-9E, manufactured by Nissei Plastic Industry Co., Ltd.) Injection molding was performed at an injection speed of 100 mm / sec, an injection rate of 66 cm ³ / sec, and a surface progression coefficient of 880 cm ³ / sec · cm to produce a molded product having a length of 60 mm × width of 60 mm and a thickness of 0.75 mm.
As shown in FIG. 1, a transmissive material having a width of 10 mm and a length of 40 mm was cut out from the obtained molded product from a position (part 3) where the distance from the film gate 1 was 40 mm.

The following evaluation was performed.
(1) Transmittance Using the spectrophotometer (“UV-3100PC” manufactured by Shimadzu Corporation) as the laser transmittance at the center of the transmission material obtained above, the transmittance (unit:%) at a wavelength of 940 nm is obtained. It was measured.
(2) Flame retardance A test piece for UL94 test (125 mm × 12.5 mm × 3.0 mmt) is molded from the obtained resin composition pellets, and V-0, V-1, V are conformed to UL94 standards. -2 was determined.
(3) Bending strength An ISO multipurpose test piece (4 mm thickness) was molded from the obtained resin composition pellets, and the bending maximum strength (unit: MPa) was measured at a temperature of 23 ° C. in accordance with ISO178.

(4) Warpage property The obtained resin composition pellets were used in a “Model SE-50D” injection molding machine manufactured by Sumitomo Heavy Industries, Ltd., and the cylinder temperature was 250 ° C., the mold temperature was 80 ° C., and the resin composition pellets were retained in the cylinder for 20 minutes. A rectangular parallelepiped box-shaped molded body shown in FIG. 4 was molded.
FIG. 4 is a perspective view of a box-shaped molded body used for evaluation of warpage, and shows a state where the bottom surface is turned up. The box-shaped molded body has a width of 25 mm, a length of 30 mm, a depth of 25 mm, a thickness of 1 mm at the bottom, and 0.5 mm at the other. The gate is a one-point gate (G in FIG. 4) in the center of the front side surface of the drawing.
The bottom face of the box was fixed so that the bottom face was on the top, and the inward warp length L of the top face of the back face when the back face in the drawing warped inwardly of the box was measured (unit: mm).
The smaller this value, the smaller the amount of warpage of the molded product, indicating better dimensional accuracy.

(5) Ratio of major axis / minor axis of brominated polycarbonate flame retardant phase in the surface layer part The surface layer part at the center of the permeation material obtained above (in the resin composition flow direction of the surface layer part having a cross-sectional depth of less than 20 μm) From a parallel cross-section, an ultrathin section having a thickness of 300 nm was cut out with a diamond knife using “UC7” manufactured by Leica. The obtained ultrathin sections were stained with ruthenium tetroxide for 210 minutes and then observed with an SEM at an acceleration voltage of 1.5 to 2 kV using a scanning electron microscope “SU8020” manufactured by Hitachi High-Tech.
A photograph of the backscattered electron image obtained by SEM / EDS analysis of the surface layer portion of the molded body obtained in Example 20 is shown in FIG.
The major axis and minor axis of the brominated polycarbonate flame retardant phase were determined by measuring 50 brominated polycarbonate flame retardant phases and averaging them.

(6) Laser welding evaluation The following laser welding test was conducted with the laser transmitting material obtained above as the transmission side.
Except using the resin composition of the following composition, the pellet obtained by making it the same as the said permeable material, cylinder temperature 255 degreeC, mold temperature 60 degreeC, injection speed 100 mm / sec, injection rate 66 cm < ³ > / sec, A molded product having a length of 60 mm × width of 60 mm × thickness of 1 mm was molded under the condition of a surface progression coefficient of 880 cm ³ / sec · cm. What was cut out from the obtained molded article in the same manner as the transmission material was used as a member for laser absorption.
Polybutylene terephthalate resin Novaduran (registered trademark, manufactured by Mitsubishi Engineering Plastics) 5008: 67.4% by mass
Glass fiber T-187 (Nippon Electric Glass Co., Ltd.): 30% by mass
Stabilizer Adekasizer EP-17 (manufactured by ADEKA): 0.4% by mass
Stabilizer ADK STAB AO-60 (manufactured by ADEKA): 0.2% by mass
Carbon black mass batch (80% by mass for NOVADURAN 5008, 20% by mass for carbon black): 2% by mass

  The transmitting material 2 and the absorbing material 3 were overlapped as shown in FIG. 2 and irradiated with laser light from the transmitting material 2 side.

Laser welding strength:
Laser welding uses a fine device laser device (laser 140W, fiber core diameter 0.6 mm), laser wavelength: 940 nm, laser scan speed: 40 mm / second, scan length: 10 mm, laser output: 20 W, pressure: 0 The distance between the laser head and the transmissive material 2 was 79.7 mm.
Using the welded body integrated by welding, the laser welding strength was measured. The welding strength is measured by using a tensile tester (Instron “5544”) and sandwiching the permeation material 2 and the absorbent material 3 which are integrated by welding, with clamps at both ends in the long axis direction. Evaluation was made by pulling at a pulling speed of 5 mm / min. The laser welding strength is indicated by the tensile shear fracture strength (unit: N) of the welded portion.

Laser welding processability:
Except for the laser scanning speed, the laser welding test was conducted by changing the laser scanning speed every 5 mm / second under the same conditions as the laser welding strength measurement. The fastest scanning speed capable of achieving a laser welding strength of 100 N or more was obtained and used as an index of laser welding processability. It can be said that the faster the scanning speed, the shorter the laser welding time and the better the laser welding processability.
The above results are shown in Table 9 below.

  The laser welding member of the present invention has extremely excellent laser transmittance and laser welding processability, and a molded product obtained by laser welding of the member has excellent welding strength. It can be suitably used for equipment parts, industrial machine parts, and other consumer parts.

1: Film gate 2: Laser absorber 2
3: Laser transmitting material 3
4: Laser irradiation location

Claims (12)

A laser welding member formed by injection molding a thermoplastic polyester resin material,
The laser welded portion of the member is located at a distance of 15 mm or more from the gate of the injection mold, and the light transmittance of laser light having a wavelength of 940 nm is 30% or more. Materials. The laser welding member according to claim 1, wherein the thermoplastic polyester resin material is injection-molded under conditions of an injection rate of 10 to 300 cm ³ / sec defined below.
Injection rate: Resin material capacity per unit time injected into the mold cavity from the discharge nozzle of the injection molding machine The laser welding member according to claim 1 or 2, wherein the thermoplastic polyester resin material is injection-molded under a condition of a surface progression coefficient of 100 to 1200 cm ³ / sec · cm defined below.
Surface progression coefficient: Value obtained by dividing the injection rate by the thickness of the mold cavity into which the resin material is injected Thermoplastic polyester-based resin material of the melt volume rate (250 ° C., measured under the conditions of a load 5 kg) laser welding member according to any one of claims 1 to 3 is 10 cm ^3/10 minutes or more.   The laser welding member according to any one of claims 1 to 4, wherein the thermoplastic polyester resin material includes a polybutylene terephthalate resin and / or a polyethylene terephthalate resin.   The thermoplastic polyester resin material includes a polybutylene terephthalate resin and a polyethylene terephthalate resin, and the content of the polyethylene terephthalate resin is 5 to 50% by mass with respect to 100% by mass in total of the polybutylene terephthalate resin and the polyethylene terephthalate resin. The laser welding member according to any one of claims 1 to 5.   The thermoplastic polyester resin material includes a polybutylene terephthalate homopolymer and a modified polybutylene terephthalate resin, and the content of the modified polybutylene terephthalate resin is 100% by mass in total of the polybutylene terephthalate resin and the modified polybutylene terephthalate resin. It is 10-70 mass%, The laser welding member of any one of Claims 1-6.   The thermoplastic polyester resin material includes a polybutylene terephthalate resin and a polycarbonate resin, and the content of the polycarbonate resin is 10 to 50% by mass with respect to 100% by mass in total of the polybutylene terephthalate resin and the polycarbonate resin. The laser welding member according to any one of -4.   The thermoplastic polyester resin material contains a polybutylene terephthalate resin, polystyrene and / or butadiene rubber-containing polystyrene and a polycarbonate resin, and is based on a total of 100% by mass of the polybutylene terephthalate resin, polystyrene and / or butadiene rubber-containing polystyrene and the polycarbonate resin. The polybutylene terephthalate resin is 30 to 90% by mass, the polystyrene and / or butadiene rubber-containing polystyrene is 1 to 50% by mass, and the polycarbonate resin is 1 to 50% by mass. Laser welding member.   The laser welding member according to any one of claims 1 to 9, which is used for a laser transmission side member.   The first laser welding member according to any one of claims 1 to 10 and a second member made of a resin material having laser absorptivity, laser light from the first laser welding member side. A molded product that is irradiated and laser welded. Irradiate the first laser welding member formed by injection molding of a thermoplastic polyester resin material and the second member made of a resin material having laser absorption from the first laser welding member side. A method of manufacturing a laser welded molded product that is laser welded,
The part to be laser welded in the first member is located at a distance of 15 mm or more from the gate of the injection mold, and the light transmittance of laser light having a wavelength of 940 nm is 30% or more. A method for manufacturing a laser welded product.