WO2018012138A1 - Resin composition for laser welding, molded product, composite molded product and method for producing same, and method for improving laser light transmissivity - Google Patents

Resin composition for laser welding, molded product, composite molded product and method for producing same, and method for improving laser light transmissivity Download PDF

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Publication number
WO2018012138A1
WO2018012138A1 PCT/JP2017/020642 JP2017020642W WO2018012138A1 WO 2018012138 A1 WO2018012138 A1 WO 2018012138A1 JP 2017020642 W JP2017020642 W JP 2017020642W WO 2018012138 A1 WO2018012138 A1 WO 2018012138A1
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Prior art keywords
resin composition
polybutylene terephthalate
molded product
terephthalate resin
laser light
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PCT/JP2017/020642
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French (fr)
Japanese (ja)
Inventor
耕一 坂田
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ウィンテックポリマー株式会社
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Priority to JP2018527433A priority Critical patent/JP6993971B2/en
Publication of WO2018012138A1 publication Critical patent/WO2018012138A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/34—Silicon-containing compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K7/00—Use of ingredients characterised by shape
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
    • C08L67/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds

Definitions

  • the present invention relates to a laser-welded polybutylene terephthalate resin composition and molded article, a composite molded article and a method for producing the same, and a method for improving the laser light transmittance of a polybutylene terephthalate resin composition.
  • FIG. 1 is an explanatory diagram of a general laser welding method. As shown in FIG. 1, in laser welding, a so-called transmission-side molded product 3 formed of a resin composition that transmits laser light 2 emitted from a light source 1 and a resin composition that absorbs laser light 2 are formed.
  • the so-called absorption-side molded product 4 is overlapped so that the surfaces to be joined face each other, and the laser beam 2 is irradiated from the transmission-side molded product 3 side toward the absorption-side molded product 4 side.
  • the overlapped interface generates heat and melts and joins. Therefore, the resin composition used for the transmission-side molded product 3 is preferably as the laser beam transmittance is higher (lower absorption rate), and the resin composition used for the absorption-side molded product 4 is laser beam absorption rate. Is higher (lower transmittance).
  • Polybutylene terephthalate resins are excellent in various properties such as heat resistance, chemical resistance, electrical properties, mechanical properties, and moldability, and are therefore used in many applications.
  • the polybutylene terephthalate-based resin itself is an opaque crystalline resin and can be easily colored with a colorant such as carbon black. Therefore, the polybutylene terephthalate resin can be easily used as the absorption-side molded product 4.
  • a polybutylene terephthalate resin is used for the transmission-side molded product 3, it is necessary to increase the laser beam transmittance of the resin.
  • a resin having a low crystallinity and a high transparency such as a polycarbonate resin or a polyethylene terephthalate resin is added as an alloy material to the polybutylene terephthalate resin.
  • Patent Document 1 a resin having a low crystallinity and a high transparency such as a polycarbonate resin or a polyethylene terephthalate resin is added as an alloy material to the polybutylene terephthalate resin.
  • an inorganic filler may be contained in the resin composition for the purpose of increasing the mechanical strength of the obtained molded product. However, when an inorganic filler is contained, laser light is scattered and the transmittance is lowered.
  • Patent Document 2 JP 2004-315805 A JP 2005-1350 A
  • An object of the present invention is to provide a laser-welded polybutylene terephthalate-based resin composition and a molded article having high laser beam permeability. It is another object of the present invention to provide a composite molded article, a method for producing the same, and a method for improving the laser light transmittance of a polybutylene terephthalate resin composition.
  • the polybutylene terephthalate resin itself is opaque and has low laser light transmittance, so even if the refractive index of the inorganic filler is devised, it is not possible to further increase the laser light transmittance. difficult.
  • the present inventor has found that a polybutylene terephthalate-based resin is used without using an alloy material when a layered silicate mineral usually used as an inorganic filler has a predetermined particle size. As a result, it was found that the transmittance of the laser beam can be improved, and the present invention has been completed.
  • a laser-welded polybutylene terephthalate resin composition according to the present invention comprises a polybutylene terephthalate resin and a layered silicate mineral having an average primary particle size of 1.0 ⁇ m to 5.0 ⁇ m. It is characterized by containing.
  • the content of the laser light transmittance improver is preferably 0.01 parts by mass or more and 20 parts by mass or less with respect to 100 parts by mass of the polybutylene terephthalate resin.
  • the layered silicate mineral preferably contains talc.
  • an inorganic filler can be further contained.
  • the present invention can be a resin composition for a laser light transmission side molded article.
  • the molded article for laser welding according to the present invention includes any one of the above polybutylene terephthalate resin compositions.
  • This molded product has a laser light transmittance of a wavelength of 800 nm to 1000 nm (especially 900 nm to 1000 nm) at an optical path length of 1.5 mm, compared with a molded product using a polybutylene terephthalate resin composition that does not contain a laser light transmission improver Can be configured to be higher.
  • the first molded product including the polybutylene terephthalate resin composition described above and the second molded product including the thermoplastic resin composition are laser-welded. It is a composite molded product.
  • the thermoplastic resin composition is preferably a polybutylene terephthalate resin composition that does not contain a laser light transmission improver.
  • the method for producing a composite molded product according to the present invention includes a second molded product including at least a part of a first molded product including the polybutylene terephthalate resin composition according to any one of the above and a thermoplastic resin composition. And at least a part of the first molded product and at least a part of the second molded product are welded by irradiating a laser beam from the first molded product side. .
  • the method for improving the laser light transmittance of the polybutylene terephthalate resin composition according to the present invention comprises blending a polybutylene terephthalate resin composition with a layered silicate mineral having an average primary particle size of 1.0 ⁇ m or more and 5.0 ⁇ m or less. It is characterized by doing.
  • the present invention it is possible to provide a polybutylene terephthalate-based resin composition and a molded product with laser welding having high laser beam transmissivity. Moreover, the composite molded article, its manufacturing method, and the laser beam transmittance improving method of a polybutylene terephthalate resin composition can be provided.
  • the polybutylene terephthalate resin composition (hereinafter, also referred to as “resin composition”) of the present embodiment is a laser-welded polybutylene terephthalate resin composition, and is a polybutylene terephthalate resin (hereinafter referred to as “PBT system”). Resin ”) and a laser light transmission improver containing a layered silicate mineral having a predetermined particle size.
  • PBT system polybutylene terephthalate resin
  • Resin a laser light transmission improver containing a layered silicate mineral having a predetermined particle size.
  • the polybutylene terephthalate-based resin is a homopolyester containing butylene terephthalate as a main component (for example, about 50% by mass to 100% by mass, preferably 60% by mass to 100% by mass, more preferably about 75% by mass to 100% by mass).
  • (Polybutylene terephthalate) or copolyester butylene terephthalate copolymer or polybutylene terephthalate copolyester.
  • copolymerizable monomer in a copolyester (butylene terephthalate copolymer or modified PBT resin), dicarboxylic acid excluding terephthalic acid, 1,4-butanediol is used. Excluded diol, oxycarboxylic acid, lactone and the like.
  • the copolymerizable monomers can be used alone or in combination of two or more.
  • dicarboxylic acid examples include aliphatic dicarboxylic acids (for example, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, undecanedicarboxylic acid, dodecanedicarboxylic acid, hexadecanedicarboxylic acid, dimer acid, etc.
  • aliphatic dicarboxylic acids for example, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, undecanedicarboxylic acid, dodecanedicarboxylic acid, hexadecanedicarboxylic acid, dimer acid, etc.
  • C 4-40 dicarboxylic acids preferably C 4-14 dicarboxylic acids
  • cycloaliphatic dicarboxylic acids eg, C 8-12 dicarboxylic acids such as hexahydrophthalic acid, hexahydroisophthalic acid, hexahydroterephthalic acid, and hymic acid
  • Acid aromatic dicarboxylic acids excluding terephthalic acid (eg, phthalic acid, isophthalic acid; naphthalenedicarboxylic acid such as 2,6-naphthalenedicarboxylic acid; 4,4′-diphenyldicarboxylic acid, 4,4′-diphenylether dicarboxylic acid) , 4,4'-Diphenylmethane dicar Phosphate, 4,4'-diphenyl ketone C 8-16 diphenyl dicarboxylic acid such as dicarboxylic acids), or reactive derivatives thereof [for example, lower alkyl esters of phthalic
  • diol examples include linear or branched aliphatic alkylene glycols other than 1,4-butanediol (for example, ethylene glycol, trimethylene glycol, propylene glycol, neopentyl glycol, hexanediol, octanediol, decanediol).
  • linear or branched aliphatic alkylene glycols other than 1,4-butanediol for example, ethylene glycol, trimethylene glycol, propylene glycol, neopentyl glycol, hexanediol, octanediol, decanediol.
  • Linear C 2-12 aliphatic glycols preferably linear or branched C 2-10 aliphatic glycols
  • (poly) oxyalkylene glycols glycols having a plurality of oxy C 2-4 alkylene units, for example Diethylene glycol, dipropylene glycol, ditetramethylene glycol, triethylene glycol, tripropylene glycol, polytetramethylene glycol, etc.
  • alicyclic diols eg, 1,4-cyclohexanediol, 1,4-cyclohexane
  • aromatic diol e.g., hydroquinone, resorcinol, C 6-14 aromatic diols such as naphthalene diol; biphenol; bisphenols; xylylene glycol and the like
  • polyols such as glycerol, a trimethylol propane, a
  • bisphenols examples include bis (4-hydroxyphenyl) methane (bisphenol F), 1,1-bis (4-hydroxyphenyl) ethane (bisphenol AD), 1,1-bis (4-hydroxyphenyl) propane, , 2-bis (4-hydroxyphenyl) propane (bisphenol A), 2,2-bis (4-hydroxy-3-methylphenyl) propane, 2,2-bis (4-hydroxyphenyl) butane, 2,2- Bis (hydroxyaryl) C 1 such as bis (4-hydroxyphenyl) -3-methylbutane, 2,2-bis (4-hydroxyphenyl) hexane, 2,2-bis (4-hydroxyphenyl) -4-methylpentane -6 alkane; 1,1-bis (4-hydroxyphenyl) cyclopentane, 1,1-bis (4-hydride) Bis (hydroxyaryl) C 4-10 cycloalkanes such as loxyphenyl) cyclohexane; 4,4′-dihydroxydiphenyl ether; 4,4′-dihydroxydiphenyl
  • alkylene oxide adduct examples include C 2-3 alkylene oxide adducts of bisphenols (eg, bisphenol A, bisphenol AD, bisphenol F, etc.), such as 2,2-bis- [4- (2-hydroxyethoxy) phenyl. Propane, diethoxylated bisphenol A (EBPA), 2,2-bis- [4- (2-hydroxypropoxy) phenyl] propane, dipropoxylated bisphenol A and the like.
  • the number of added moles of alkylene oxide C2-3 alkylene oxide such as ethylene oxide and propylene oxide
  • oxycarboxylic acid examples include oxybenzoic acid, oxynaphthoic acid, hydroxyphenylacetic acid, glycolic acid, oxycaproic acid and other oxycarboxylic acids or derivatives thereof.
  • Lactones include C 3-12 lactones such as propiolactone, butyrolactone, valerolactone, caprolactone (eg, ⁇ -caprolactone, etc.), and the like.
  • Preferable copolymerizable monomers include diols or dicarboxylic acids.
  • the diol include C 2-6 alkylene glycol (linear or branched alkylene glycol such as ethylene glycol, trimethylene glycol, propylene glycol, hexanediol, etc.), and an oxyalkylene unit having a repeating number of about 2 to 4.
  • polyoxy C 2-4 alkylene glycol diethylene glycol, etc.
  • bisphenols bisphenols or alkylene oxide adducts thereof
  • Dicarboxylic acids include C 6-12 aliphatic dicarboxylic acids (adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, etc.), asymmetric aromatic dicarboxylic acids in which the carboxyl group is substituted at the asymmetric position of the arene ring, 1, 4-cyclohexanedimethanol and the like can be mentioned.
  • aromatic compounds such as alkylene oxide adducts of bisphenols (particularly bisphenol A), and asymmetric aromatic dicarboxylic acids [phthalic acid, isophthalic acid, and reactive derivatives thereof (dimethylisophthalic acid (DMI)) Etc.) are preferred.
  • the polybutylene terephthalate resin is preferably a homopolyester (polybutylene terephthalate) and / or a copolymer (polybutylene terephthalate copolyester), and the proportion (modification amount) of the copolymerizable monomer is usually 45 mol% or less ( For example, it may be about 0 to 40 mol%), preferably 35 mol% or less (for example, about 0 to 35 mol%), or 30 mol% or less (about 0 to 30 mol%).
  • the proportion of the copolymerizable monomer in the copolymer can be selected, for example, from the range of about 0.01 to 30 mol%, and is usually 1 to 30 mol%, preferably 3 to 25 mol%. More preferably, it is about 5 to 20 mol% (for example, 5 to 15 mol%).
  • the proportion of the copolymerizable monomer in the copolymer can be selected from the range of, for example, about 0.1 to 45 mol%, and is usually 1 to 40 mol% (eg, 5 to 40 mol%) %), Preferably about 10 to 35 mol%.
  • the ratio of the homopolyester and the copolyester is such that the ratio of the copolymerizable monomer is 0.1 to
  • the range is about 30 mol% (preferably 1 to 25 mol%, more preferably 5 to 25 mol%), and the mass ratio of homopolyester / copolyester is usually 99/1 to 1/99, preferably It can be selected from the range of about 95/5 to 5/95, more preferably about 90/10 to 10/90.
  • the polybutylene terephthalate resin is obtained by copolymerizing terephthalic acid or a reactive derivative thereof and 1,4-butanediol with a monomer that can be copolymerized as necessary by a conventional method such as transesterification or direct esterification. Can be manufactured.
  • the content of the polybutylene terephthalate resin can be 50% by mass or more and less than 100% by mass in the total resin composition, preferably 60% by mass or more and less than 100% by mass, and more preferably 65% by mass. It can be set to mass% or more and 99.9 mass% or less.
  • the laser light transmission improving agent is an inorganic material having an action of improving the laser light transmission of the polybutylene terephthalate resin composition which is an opaque resin. Since the transmittance of the laser light of the resin composition is increased, a molded product manufactured using the resin composition can be used as a transmission-side molded product for laser welding.
  • the laser light transmission improver contains a layered silicate mineral.
  • the laser light transmission improver can also be configured to be a layered silicate mineral.
  • Layered silicate minerals are usually often used as inorganic fillers to improve the mechanical properties of the resulting molded body. Resins containing inorganic fillers are light transmissive due to light scattering. Is known to decrease.
  • the present inventors' research has newly revealed that a layered silicate mineral having a predetermined particle size has an effect of improving the laser light transmittance of a polybutylene terephthalate resin. Therefore, in this embodiment, a layered silicate mineral having a predetermined particle size is used as a laser light transmission improver.
  • the layered silicate mineral is a layered mineral composed of at least a metal oxide component and a SiO 2 component.
  • layered silicate minerals include talc, mica, kaolin, pyrophyllite, sericite, vermiculite, smectite, bentonite, stevensite, montmorillonite, beidellite, saponite, hectorite, nontronite and the like. , One or more selected from these can be used. Of these, talc is preferable.
  • the layered silicate mineral may be treated or untreated.
  • an artificial synthetic product corresponding to a natural product can also be used.
  • silicate minerals obtained from various synthetic methods using conventionally known various methods such as solid reaction, hydrothermal reaction, and ultrahigh pressure reaction can be used.
  • the average primary particle diameter of the layered silicate mineral is 1.0 ⁇ m or more and 5.0 ⁇ m or less.
  • the average primary particle diameter is preferably 1.5 ⁇ m or more and less than 5.0 ⁇ m, more preferably 2.0 ⁇ m or more or more than 2.0 ⁇ m, or less than 4.0 ⁇ m or less than 4.0 ⁇ m.
  • the “average primary particle size” is a value calculated by weighted average of the layered silicate mineral before blended with the resin composition by analyzing an image taken with a CCD camera. For example, it can be calculated using a dynamic image analysis method / particle (state) analyzer PITA-3 manufactured by Seishin Corporation.
  • the aspect ratio of the layered silicate mineral is not particularly limited, and can be, for example, 1 or more and 10 or less.
  • the content of the laser light transmission improver is preferably 0.01 parts by mass or more and 20 parts by mass or less with respect to 100 parts by mass of the polybutylene terephthalate resin. More preferably, they are 0.5 mass part or more and 15 mass parts or less, More preferably, they are 1.0 mass part or more and less than 15 mass parts. A lower limit can also be 5.0 mass parts or more.
  • the content of the layered silicate mineral is in the range of 0.01 parts by mass or more and 20 parts by mass or less, the laser light transmittance of the polybutylene terephthalate resin can be further improved.
  • a molded article using a polybutylene terephthalate resin composition having a layered silicate mineral content of 0.01 parts by mass or more can reduce variations in laser light transmittance in the molded article.
  • the resin composition of the present embodiment may contain an inorganic filler for the purpose of improving the mechanical properties of the obtained molded product.
  • an inorganic filler a fibrous filler, a plate-like filler, or a granular filler can be mentioned.
  • fibrous filler examples include glass fiber, asbestos fiber, carbon fiber, silica fiber, alumina fiber, silica-alumina fiber, aluminum silicate fiber, zirconia fiber, potassium titanate fiber, silicon carbide fiber, whisker (silicon carbide, Inorganic fibers such as whiskers such as alumina and silicon nitride); organic fibers such as aliphatic or aromatic polyamides, aromatic polyesters, acrylic resins such as fluororesin and polyacrylonitrile, fibers formed of rayon, etc.
  • whisker silicon carbide, Inorganic fibers such as whiskers such as alumina and silicon nitride
  • organic fibers such as aliphatic or aromatic polyamides, aromatic polyesters, acrylic resins such as fluororesin and polyacrylonitrile, fibers formed of rayon, etc.
  • the plate-like filler examples include talc, mica, glass flake, and graphite.
  • particulate filler examples include glass beads, glass powder, milled fiber (for example, milled glass fiber), wollastonite (wollastonite), and the like.
  • the wollastonite may be in the form of a plate, column, fiber, or the like.
  • glass fiber is preferable because it is inexpensive and easily available.
  • the average diameter of the fibrous filler is, for example, about 1 ⁇ m to 30 ⁇ m (preferably 3 ⁇ m to 20 ⁇ m), and the average length is, for example, about 100 ⁇ m to 5 mm (preferably 300 ⁇ m to 4 mm, more preferably 500 ⁇ m to 3.5 mm). There may be. Further, the average primary particle diameter of the plate-like or granular filler can be, for example, about 10 ⁇ m to 500 ⁇ m, preferably about 15 ⁇ m to 100 ⁇ m. These inorganic fillers can be used alone or in combination of two or more.
  • the average diameter and average length of the fibrous filler and the average primary particle diameter of the plate-like or powdery filler are the fibrous filler, plate-like or powdery filler before being mixed in the resin composition. Is a value calculated by analyzing an image photographed with a CCD camera and calculating a weighted average, and can be calculated using a device similar to the device used in the measurement of the average primary particle diameter of the layered silicate mineral.
  • the content of the inorganic filler is 5 parts by mass or more and 100 parts by mass or less, preferably 10 parts by mass or more and 80 parts by mass or less, more preferably 15 parts by mass or more and 60 parts by mass with respect to 100 parts by mass of the polybutylene terephthalate resin. It can be as follows. By setting it within this numerical range, it is possible to improve the mechanical properties and dimensional accuracy of the obtained molded product while maintaining the action of the above-described laser light transmission improving agent.
  • additives Various additives such as stabilizers (antioxidants, ultraviolet absorbers, heat stabilizers, etc.), flame retardants, lubricants, mold release agents, antistatic agents, coloring agents such as dyes and pigments, You may add a dispersing agent, a plasticizer, a nucleating agent, etc.
  • the content of the additive can be, for example, more than 0 parts by mass and 20 parts by mass or less with respect to 100 parts by mass of the polybutylene terephthalate resin.
  • the colorant if it is necessary to color the same color as the laser light absorption side molded product, in particular, black, due to the requirement of the design surface, a dye-based colorant so as not to impair the laser light transmittance. Or a pigment that does not impair the laser light transmittance (for example, BASF Lummogen Black) is desirable.
  • the resin composition can also contain other resins (thermoplastic resin, thermosetting resin, etc.) as necessary.
  • other resins include olefin elastomers, styrene elastomers, polyester elastomers, and core-shell polymers.
  • the polybutylene terephthalate resin composition of the present embodiment contains a laser light transmission improver, it has a laser light transmission property without adding a highly transparent resin as an alloy material. Therefore, the resin composition can be configured not to contain an alloy material. On the other hand, an alloy material can also be added in order to further enhance the laser light transmittance of the resin composition.
  • the alloy material include a polycarbonate resin, a polyethylene terephthalate resin, and a styrene resin.
  • the content thereof can be made lower than the amount added to the conventional PBT resin composition. For example, the content exceeds 0 part by mass with respect to 100 parts by mass of the polybutylene terephthalate resin. It can be below mass parts (for example, 20 mass parts).
  • the resin composition of the present embodiment may be a powder mixture or a molten mixture (pellets or the like).
  • a molded article formed using this resin composition has a higher laser beam transmittance than a molded article formed using a polybutylene terephthalate-based resin composition that does not contain a laser beam transmission improver. Therefore, the resin composition is suitable for producing a molded product for laser welding. In particular, it is suitable for manufacturing a laser light transmission side molded product.
  • the molded product can be formed using the above-described resin composition, and includes the above-described resin composition.
  • This molded product has a higher laser light transmittance at a wavelength of 800 nm to 1000 nm at an optical path length of 1.5 mm than a molded product formed using a polybutylene terephthalate resin composition that does not contain a laser light transmission improver.
  • the laser light transmittance is, for example, 20% of the laser light transmittance at a wavelength of 800 nm to 1000 nm in a molded product of 80 mm long ⁇ 80 mm wide ⁇ 1.5 mm thick (side gate, gate width 2 mm) formed by injection molding. For example, it is 23% or more.
  • the laser light transmittance is a value measured using a spectrophotometer.
  • the molded product can be obtained by molding the resin composition by a conventional method. For example, (1) A method in which each component is mixed, kneaded by a single or twin screw extruder and extruded to prepare pellets, and then molded. (2) A pellet (master batch) having a different composition is once prepared. The pellets can be mixed (diluted) in a predetermined amount and subjected to molding to obtain a molded product having a predetermined composition, or (3) a method in which one or more of each component is directly charged into a molding machine.
  • the pellets may be prepared by, for example, melting and mixing components excluding brittle components (such as glass-based reinforcing materials) and then mixing brittle components (such as glass-based reinforcing materials).
  • molding method conventional methods such as extrusion molding, injection molding, compression molding, blow molding, vacuum molding, rotational molding, gas injection molding, etc. can be used, but usually molding is performed by injection molding.
  • the shape of the molded product is not particularly limited, but since the molded product is used by joining with a mating material (other resin molded product) by laser welding, it usually has a shape having at least a contact surface (such as a flat surface) (for example, a plate shape) ).
  • the molded article of the present invention has high permeability to the laser beam, the thickness of the molded article (the thickness in the direction in which the laser beam is transmitted) at the site where the laser beam is transmitted can be selected from a wide range. It may be about 3 mm to 5 mm, preferably about 0.5 mm to 3 mm (for example, 1 mm to 2 mm).
  • the molded product is excellent in laser weldability, it is usually preferable to weld the resin molded product of the counterpart material by laser welding, but if necessary, other thermal welding methods, for example, vibration welding method, It can also be welded to other resin molded products by ultrasonic welding, hot plate welding, or the like.
  • the composite molded article includes a first molded article formed using a polybutylene terephthalate resin composition and including the resin composition, and a second molded article formed using the thermoplastic resin composition and including the thermoplastic resin composition.
  • the molded article is a laser-welded composite molded article.
  • the first molded product and the second molded product are joined and integrated by laser welding.
  • the composite molded article is formed by superimposing at least a part of the first molded article containing the polybutylene terephthalate resin composition and at least a part of the second molded article containing the thermoplastic resin composition.
  • the interface between the first molded product and the second molded product is at least partially melted to bring the joining surface into close contact, and then the two molded products are joined by cooling. It can be integrated into one composite molded body.
  • the thermoplastic resin composition constituting the second molded product is not particularly limited as long as it is a resin composition compatible with the polybutylene terephthalate resin, and examples thereof include olefin resins, vinyl resins, and styrene resins.
  • the resin composition include a resin, an acrylic resin, a polyester resin, a polyamide resin, and a polycarbonate resin.
  • the same type or the same type of resins as those constituting the polybutylene terephthalate resin aromatic polyester resins such as PBT resins and PET resins
  • polycarbonate resins or compositions thereof You may comprise material.
  • the first molded body may be formed of the polybutylene terephthalate resin composition of the present embodiment
  • the second molded body may be formed of a polybutylene terephthalate resin that does not contain a laser light transmission improver. .
  • the second molded product may contain an absorber or a colorant for laser light.
  • the colorant can be selected according to the wavelength of the laser beam, and an inorganic pigment or an organic pigment can be used.
  • Inorganic pigments include black pigments such as carbon black (for example, acetylene black, lamp black, thermal black, furnace black, channel black, ketjen black), red pigments such as iron oxide red, and orange pigments such as molybdate orange. And white pigments such as titanium oxide.
  • the organic pigment include a yellow pigment, an orange pigment, a red pigment, a blue pigment, and a green pigment.
  • These absorbents can be used alone or in combination of two or more.
  • black pigments or dyes, particularly carbon black can be used.
  • the average particle size of carbon black may be usually about 1 nm to 1000 nm, preferably about 10 nm to 100 nm.
  • the ratio of the colorant is 0.1% by mass to 10% by mass, preferably 0.5% by mass to 5% by mass (for example, 0.5% by mass to 3% by mass) with respect to the entire composition constituting the second molded article. Mass%).
  • Irradiation with laser light is usually performed from the first molded body side toward the second molded body, and heat is generated at the interface of the second molded body having light absorption, thereby the first molded body. And the second molded body are fused. If necessary, a lens system may be used to focus the laser beam on the interface between the first molded product and the second molded product and fuse the contact interface.
  • the laser light source is not particularly limited, and for example, a dye laser, a gas laser (excimer laser, argon laser, krypton laser, helium-neon laser, etc.), a solid laser (YAG laser, etc.), a semiconductor laser, and the like can be used. As the laser light, a pulse laser is usually used.
  • the composite molded product obtained in the present embodiment has high welding strength and little damage to the PBT resin due to laser light irradiation. Therefore, various applications such as electrical / electronic parts, office automate (OA) equipment parts, etc. It can be applied to home appliance parts, machine mechanism parts, automobile mechanism parts and the like. In particular, it can be suitably used for automobile electrical parts (various control units, ignition coil parts, etc.), motor parts, various sensor parts, connector parts, switch parts, relay parts, coil parts, transformer parts, lamp parts, and the like.
  • OA office automate
  • the method for improving the laser light transmittance of a polybutylene terephthalate resin composition is that a layered silicate mineral having an average primary particle diameter of 1.0 ⁇ m or more and 5.0 ⁇ m or less is blended with a polybutylene terephthalate resin composition. is there. Thereby, the laser beam transmittance of the polybutylene terephthalate resin composition can be improved, and the polybutylene terephthalate resin composition can be used for the production of a transmission side molded product used for laser welding.
  • the polybutylene terephthalate-based resin composition containing a layered silicate mineral having a predetermined particle size does not contain a layered silicate mineral, as shown in Examples described later.
  • the laser light transmittance was improved as compared with the case where a layered silicate mineral having a particle size outside the predetermined range was contained.
  • the type and content of the layered silicate mineral and the preferable range of the particle diameter are as described above, and are not described here.
  • Examples 1 to 4 Comparative Examples 1 to 4
  • pellets were produced by kneading at 250 ° C. with a twin-screw extruder (manufactured by Nippon Steel Works, 30 mm ⁇ ) at the content ratios shown in Tables 1 and 2.
  • the average primary particle diameter of talc was measured using a dynamic image analysis method / particle (state) analyzer PITA-3 manufactured by Seishin Enterprise Co., Ltd.
  • Polybutylene terephthalate resin PBT having an intrinsic viscosity of 0.95 dl / g, manufactured by Wintech Polymer Co., Ltd.
  • Talc 1 Talc with an average primary particle size of 2.6 ⁇ m
  • Talc 2 Talc with an average primary particle size of 3.4 ⁇ m
  • Talc 3 Talc with an average primary particle size of 6.2 ⁇ m
  • Talc 4 Talc glass fibers with an average primary particle size of 0.6 ⁇ m (GF): manufactured by Nippon Electric Glass Co., Ltd., trade name “ECS03T-187”, average diameter 13 ⁇ m, average length 3 mm
  • the molded articles formed using the resin compositions of Examples 1 to 4 were those of Comparative Example 1 formed using a resin composition containing no layered silicate mineral.
  • the laser light transmittance was improved as compared with the molded products of Comparative Examples 2 to 4 formed using a molded product and a resin composition containing a layered silicate mineral having a particle size outside the predetermined range.
  • This molded article has a laser light transmittance of a wavelength of 800 nm to 1000 nm as high as 23% or more, and is useful for producing a transmission side molded article at the time of laser welding.

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Abstract

[Problem] To provide a polybutylene therephthalate resin composition for laser welding, and a molded product. [Solution] To provide a polybutylene terephthalate resin composition for laser welding, containing: a polybutylene terephthalate resin; and a laser light transmissivity improving agent including a layered silicate mineral having an average primary particle size of 1.0 µm to 5.0 µm. The amount of laser light transmissivity improving agent contained is preferably 0.01 parts by mass to 20 parts by mass with respect to 100 parts by mass of polybutylene terephthalate resin.

Description

レーザー溶着用樹脂組成物及び成形品、複合成形品及びその製造方法、並びにレーザー光透過性向上方法LASER WELDING RESIN COMPOSITION AND MOLDED ARTICLE, COMPOSITE MOLDED ARTICLE, PROCESS FOR PRODUCING THE SAME, AND LASER LIGHT TRANSMISSION IMPROVEMENT METHOD
　本発明は、レーザー溶着用ポリブチレンテレフタレート系樹脂組成物及び成形品、複合成形品及びその製造方法、並びにポリブチレンテレフタレート系樹脂組成物のレーザー光透過性向上方法に関する。 The present invention relates to a laser-welded polybutylene terephthalate resin composition and molded article, a composite molded article and a method for producing the same, and a method for improving the laser light transmittance of a polybutylene terephthalate resin composition.
　樹脂製の成形品同士を接合する技術として、熱溶着が知られている。熱溶着は、接合させる成形品の表面を加熱して溶融させ、溶融した面同士を密着させて接合させる技術である。熱溶着のうち、熱源としてレーザー光を用いるものが、レーザー溶着である。図１は、一般的なレーザー溶着方法についての説明図である。図１に示すように、レーザー溶着では、光源１から発せられるレーザー光２を透過する樹脂組成物で形成されたいわゆる透過側成形品３と、レーザー光２を吸収する樹脂組成物で形成されたいわゆる吸収側成形品４とを、接合させたい面同士が対向するように重ね合せ、透過側成形品３側から吸収側成形品４側に向けてレーザー光２を照射する。レーザー光２の照射により、重ね合せた界面が発熱して溶融し接合される。そのため、透過側成形品３に用いられる樹脂組成物は、レーザー光の透過率が高いほど（吸収率が低いほど）好ましく、吸収側成形品４に用いられる樹脂組成物は、レーザー光の吸収率が高いほど（透過率が低いほど）好ましい。 Thermal welding is known as a technique for joining resin molded products together. Thermal welding is a technique in which the surfaces of molded articles to be joined are heated and melted, and the melted surfaces are brought into close contact with each other to be joined. Among thermal welding, laser welding uses laser light as a heat source. FIG. 1 is an explanatory diagram of a general laser welding method. As shown in FIG. 1, in laser welding, a so-called transmission-side molded product 3 formed of a resin composition that transmits laser light 2 emitted from a light source 1 and a resin composition that absorbs laser light 2 are formed. The so-called absorption-side molded product 4 is overlapped so that the surfaces to be joined face each other, and the laser beam 2 is irradiated from the transmission-side molded product 3 side toward the absorption-side molded product 4 side. By irradiating the laser beam 2, the overlapped interface generates heat and melts and joins. Therefore, the resin composition used for the transmission-side molded product 3 is preferably as the laser beam transmittance is higher (lower absorption rate), and the resin composition used for the absorption-side molded product 4 is laser beam absorption rate. Is higher (lower transmittance).
　ポリブチレンテレフタレート系樹脂は、耐熱性、耐薬品性、電気的特性、機械的特性、及び成形加工性等の種々の特性に優れるため、多くの用途に用いられている。ポリブチレンテレフタレート系樹脂は、それ自体が不透明な結晶性樹脂であり、カーボンブラック等の着色剤で容易に着色することもできるため、吸収側成形品４としては容易に用いることができる。反対に、ポリブチレンテレフタレート系樹脂を透過側成形品３に用いる場合は、樹脂のレーザー光の透過性を高める必要がある。ポリブチレンテレフタレート系樹脂のレーザー光の透過性を高める方法としては、例えば、ポリブチレンテレフタレート系樹脂に、ポリカーボネート樹脂やポリエチレンテレフタレート樹脂等の結晶化度が低く透明性の高い樹脂をアロイ材として添加する方法がある（特許文献１）。
　また、得られる成形品の機械的強度を高める等の目的で、樹脂組成物中に無機充填剤を含有させる場合がある。しかし、無機充填剤を含有させると、レーザー光が散乱して透過率が下がってしまう。そこで、ポリプロピレン樹脂のレーザー光透過性を損なわせないために、当該樹脂と同程度の屈折率を有する無機充填剤を用いる技術がある（特許文献２）。
特開２００４－３１５８０５号公報 特開２００５－１３５０号公報 Polybutylene terephthalate resins are excellent in various properties such as heat resistance, chemical resistance, electrical properties, mechanical properties, and moldability, and are therefore used in many applications. The polybutylene terephthalate-based resin itself is an opaque crystalline resin and can be easily colored with a colorant such as carbon black. Therefore, the polybutylene terephthalate resin can be easily used as the absorption-side molded product 4. On the other hand, when a polybutylene terephthalate resin is used for the transmission-side molded product 3, it is necessary to increase the laser beam transmittance of the resin. As a method for increasing the laser light transmittance of the polybutylene terephthalate resin, for example, a resin having a low crystallinity and a high transparency such as a polycarbonate resin or a polyethylene terephthalate resin is added as an alloy material to the polybutylene terephthalate resin. There is a method (Patent Document 1).
Moreover, an inorganic filler may be contained in the resin composition for the purpose of increasing the mechanical strength of the obtained molded product. However, when an inorganic filler is contained, laser light is scattered and the transmittance is lowered. Therefore, there is a technique using an inorganic filler having a refractive index comparable to that of the resin so as not to impair the laser light transmittance of the polypropylene resin (Patent Document 2).
JP 2004-315805 A JP 2005-1350 A
　本発明は、レーザー光の透過性が高いレーザー溶着用ポリブチレンテレフタレート系樹脂組成物及び成形品を提供することを課題とする。また、複合成形品及びその製造方法、並びにポリブチレンテレフタレート系樹脂組成物のレーザー光透過性向上方法を提供することを課題とする。 An object of the present invention is to provide a laser-welded polybutylene terephthalate-based resin composition and a molded article having high laser beam permeability. It is another object of the present invention to provide a composite molded article, a method for producing the same, and a method for improving the laser light transmittance of a polybutylene terephthalate resin composition.
　上述のように、ポリブチレンテレフタレート系樹脂は、それ自体が不透明でレーザー光の透過性が低いため、たとえ無機充填剤の屈折率を工夫したとしても、レーザー光の透過性をそれ以上高めることは難しい。しかしながら、驚くべきことに、本発明者は、通常は無機充填剤として用いられる層状ケイ酸塩鉱物のうち所定の粒径のものを含有した場合に、アロイ材を用いずともポリブチレンテレフタレート系樹脂のレーザー光の透過性を高めることができることを見出し、本発明を完成させるに至った。 As mentioned above, the polybutylene terephthalate resin itself is opaque and has low laser light transmittance, so even if the refractive index of the inorganic filler is devised, it is not possible to further increase the laser light transmittance. difficult. Surprisingly, however, the present inventor has found that a polybutylene terephthalate-based resin is used without using an alloy material when a layered silicate mineral usually used as an inorganic filler has a predetermined particle size. As a result, it was found that the transmittance of the laser beam can be improved, and the present invention has been completed.
　本発明に係るレーザー溶着用ポリブチレンテレフタレート系樹脂組成物は、ポリブチレンテレフタレート系樹脂と、平均一次粒子径が１．０μｍ以上５．０μｍ以下の層状ケイ酸塩鉱物を含むレーザー光透過性向上剤とを含有することを特徴とする。 A laser-welded polybutylene terephthalate resin composition according to the present invention comprises a polybutylene terephthalate resin and a layered silicate mineral having an average primary particle size of 1.0 μm to 5.0 μm. It is characterized by containing.
　本発明において、レーザー光透過性向上剤の含有量が、ポリブチレンテレフタレート系樹脂１００質量部に対して０．０１質量部以上２０質量部以下であることが好ましい。層状ケイ酸塩鉱物が、タルクを含むことが好ましい。 In the present invention, the content of the laser light transmittance improver is preferably 0.01 parts by mass or more and 20 parts by mass or less with respect to 100 parts by mass of the polybutylene terephthalate resin. The layered silicate mineral preferably contains talc.
　本発明において、さらに無機充填剤を含有することができる。本発明は、レーザー光透過側成形品用の樹脂組成物とすることができる。 In the present invention, an inorganic filler can be further contained. The present invention can be a resin composition for a laser light transmission side molded article.
　本発明に係るレーザー溶着用成形品は、上記いずれかに記載のポリブチレンテレフタレート系樹脂組成物を含むことを特徴とする。この成形品は、光路長１．５ｍｍにおける波長８００ｎｍ～１０００ｎｍ（特に９００ｎｍ～１０００ｎｍ）のレーザー光透過率が、レーザー光透過性向上剤を含有しないポリブチレンテレフタレート系樹脂組成物を用いた成形品よりも高くなるように構成することができる。 The molded article for laser welding according to the present invention includes any one of the above polybutylene terephthalate resin compositions. This molded product has a laser light transmittance of a wavelength of 800 nm to 1000 nm (especially 900 nm to 1000 nm) at an optical path length of 1.5 mm, compared with a molded product using a polybutylene terephthalate resin composition that does not contain a laser light transmission improver Can be configured to be higher.
　本発明に係る複合成形品は、上記いずれかに記載のポリブチレンテレフタレート系樹脂組成物を含む第１の成形品と、熱可塑性樹脂組成物を含む第２の成形品とが、レーザー溶着された複合成形品である。本発明において、熱可塑性樹脂組成物が、レーザー光透過性向上剤を含有しないポリブチレンテレフタレート系樹脂組成物であることが好ましい。 In the composite molded product according to the present invention, the first molded product including the polybutylene terephthalate resin composition described above and the second molded product including the thermoplastic resin composition are laser-welded. It is a composite molded product. In the present invention, the thermoplastic resin composition is preferably a polybutylene terephthalate resin composition that does not contain a laser light transmission improver.
　本発明に係る複合成形品の製造方法は、上記いずれかに記載のポリブチレンテレフタレート系樹脂組成物を含む第１の成形品の少なくとも一部と、熱可塑性樹脂組成物を含む第２の成形品の少なくとも一部とを重ね合せ、第１の成形品側からレーザー光を照射して第１の成形品の少なくとも一部と第２の成形品の少なくとも一部とを溶着することを特徴とする。 The method for producing a composite molded product according to the present invention includes a second molded product including at least a part of a first molded product including the polybutylene terephthalate resin composition according to any one of the above and a thermoplastic resin composition. And at least a part of the first molded product and at least a part of the second molded product are welded by irradiating a laser beam from the first molded product side. .
　本発明に係るポリブチレンテレフタレート系樹脂組成物のレーザー光透過性向上方法は、ポリブチレンテレフタレート系樹脂組成物に、平均一次粒子径が１．０μｍ以上５．０μｍ以下の層状ケイ酸塩鉱物を配合することを特徴とする。 The method for improving the laser light transmittance of the polybutylene terephthalate resin composition according to the present invention comprises blending a polybutylene terephthalate resin composition with a layered silicate mineral having an average primary particle size of 1.0 μm or more and 5.0 μm or less. It is characterized by doing.
　本発明によれば、レーザー光の透過性が高いレーザー溶着用ポリブチレンテレフタレート系樹脂組成物及び成形品を提供することができる。また、複合成形品及びその製造方法、並びにポリブチレンテレフタレート系樹脂組成物のレーザー光透過性向上方法を提供することができる。 According to the present invention, it is possible to provide a polybutylene terephthalate-based resin composition and a molded product with laser welding having high laser beam transmissivity. Moreover, the composite molded article, its manufacturing method, and the laser beam transmittance improving method of a polybutylene terephthalate resin composition can be provided.
レーザー溶着についての説明図である。It is explanatory drawing about laser welding.
　以下、本発明の一実施形態について詳細に説明する。本発明は、以下の実施形態に限定されるものではなく、本発明の効果を阻害しない範囲で適宜変更を加えて実施することができる。 Hereinafter, an embodiment of the present invention will be described in detail. The present invention is not limited to the following embodiments, and can be implemented with appropriate modifications within a range that does not impair the effects of the present invention.
［樹脂組成物］
　本実施形態のポリブチレンテレフタレート系樹脂組成物（以下、「樹脂組成物」ともいう。）は、レーザー溶着用のポリブチレンテレフタレート系樹脂組成物であり、ポリブチレンテレフタレート系樹脂（以下、「ＰＢＴ系樹脂」ともいう。）と、所定の粒径を有する層状ケイ酸塩鉱物を含むレーザー光透過性向上剤とを含有する。以下、ＰＢＴ樹脂、レーザー光透過性向上剤の順に説明する。 [Resin composition]
The polybutylene terephthalate resin composition (hereinafter, also referred to as “resin composition”) of the present embodiment is a laser-welded polybutylene terephthalate resin composition, and is a polybutylene terephthalate resin (hereinafter referred to as “PBT system”). Resin ") and a laser light transmission improver containing a layered silicate mineral having a predetermined particle size. Hereinafter, the PBT resin and the laser light transmission improver will be described in this order.
（ポリブチレンテレフタレート系樹脂）
　ポリブチレンテレフタレート系樹脂としては、ブチレンテレフタレートを主成分（例えば、５０質量％～１００質量％、好ましくは６０質量％～１００質量％、さらに好ましくは７５質量％～１００質量％程度）とするホモポリエステル（ポリブチレンテレフタレート）又はコポリエステル（ブチレンテレフタレート系共重合体又はポリブチレンテレフタレートコポリエステル）等が挙げられる。 (Polybutylene terephthalate resin)
The polybutylene terephthalate-based resin is a homopolyester containing butylene terephthalate as a main component (for example, about 50% by mass to 100% by mass, preferably 60% by mass to 100% by mass, more preferably about 75% by mass to 100% by mass). (Polybutylene terephthalate) or copolyester (butylene terephthalate copolymer or polybutylene terephthalate copolyester).
　コポリエステル（ブチレンテレフタレート系共重合体又は変性ＰＢＴ樹脂）における共重合可能なモノマー（以下、「共重合性モノマー」ともいう。）としては、テレフタル酸を除くジカルボン酸、１，４－ブタンジオールを除くジオール、オキシカルボン酸、ラクトン等が挙げられる。共重合性モノマーは一種で又は二種以上組み合わせて使用できる。 As a copolymerizable monomer (hereinafter, also referred to as “copolymerizable monomer”) in a copolyester (butylene terephthalate copolymer or modified PBT resin), dicarboxylic acid excluding terephthalic acid, 1,4-butanediol is used. Excluded diol, oxycarboxylic acid, lactone and the like. The copolymerizable monomers can be used alone or in combination of two or more.
　ジカルボン酸としては、例えば、脂肪族ジカルボン酸（例えば、コハク酸、グルタル酸、アジピン酸、ピメリン酸、スベリン酸、アゼライン酸、セバシン酸、ウンデカンジカルボン酸、ドデカンジカルボン酸、ヘキサデカンジカルボン酸、ダイマー酸等のＣ４－４０ジカルボン酸、好ましくはＣ４－１４ジカルボン酸）、脂環式ジカルボン酸（例えば、ヘキサヒドロフタル酸、ヘキサヒドロイソフタル酸、ヘキサヒドロテレフタル酸、ハイミック酸等のＣ８－１２ジカルボン酸）、テレフタル酸を除く芳香族ジカルボン酸（例えば、フタル酸、イソフタル酸；２，６－ナフタレンジカルボン酸等のナフタレンジカルボン酸；４，４’－ジフェニルジカルボン酸、４，４’－ジフェニルエーテルジカルボン酸、４，４’－ジフェニルメタンジカルボン酸、４，４’－ジフェニルケトンジカルボン酸等のＣ８－１６ジフェニルジカルボン酸）、又はこれらの反応性誘導体［例えば、低級アルキルエステル（ジメチルフタル酸、ジメチルイソフタル酸（ＤＭＩ）等のフタル酸又はイソフタル酸のＣ１－４アルキルエステル等）、酸クロライド、酸無水物等のエステル形成可能な誘導体］等が挙げられる。さらに、必要に応じて、トリメリット酸、ピロメリット酸等の多価カルボン酸等を併用してもよい。 Examples of the dicarboxylic acid include aliphatic dicarboxylic acids (for example, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, undecanedicarboxylic acid, dodecanedicarboxylic acid, hexadecanedicarboxylic acid, dimer acid, etc. C 4-40 dicarboxylic acids, preferably C 4-14 dicarboxylic acids), cycloaliphatic dicarboxylic acids (eg, C 8-12 dicarboxylic acids such as hexahydrophthalic acid, hexahydroisophthalic acid, hexahydroterephthalic acid, and hymic acid) Acid), aromatic dicarboxylic acids excluding terephthalic acid (eg, phthalic acid, isophthalic acid; naphthalenedicarboxylic acid such as 2,6-naphthalenedicarboxylic acid; 4,4′-diphenyldicarboxylic acid, 4,4′-diphenylether dicarboxylic acid) , 4,4'-Diphenylmethane dicar Phosphate, 4,4'-diphenyl ketone C 8-16 diphenyl dicarboxylic acid such as dicarboxylic acids), or reactive derivatives thereof [for example, lower alkyl esters of phthalic acid such as (dimethyl phthalate, dimethyl isophthalate (DMI) Or C 1-4 alkyl ester of isophthalic acid, etc.), derivatives capable of forming an ester such as acid chloride, acid anhydride, etc.]. Furthermore, you may use together polyvalent carboxylic acids, such as trimellitic acid and a pyromellitic acid, as needed.
　ジオールには、例えば、１，４－ブタンジオールを除く脂肪族アルキレングリコール（例えば、エチレングリコール、トリメチレングリコール、プロピレングリコール、ネオペンチルグリコール、ヘキサンジオール、オクタンジオール、デカンジオール等の直鎖状又は分岐鎖状Ｃ２－１２脂肪族グリコール、好ましくは直鎖状又は分岐鎖状Ｃ２－１０脂肪族グリコール）、（ポリ）オキシアルキレングリコール（複数のオキシＣ２－４アルキレン単位を有するグリコール、例えば、ジエチレングリコール、ジプロピレングリコール、ジテトラメチレングリコール、トリエチレングリコール、トリプロピレングリコール、ポリテトラメチレングリコール等）、脂環族ジオール（例えば、１，４－シクロヘキサンジオール、１，４－シクロヘキサンジメタノール、水素化ビスフェノールＡ等）、芳香族ジオール（例えば、ハイドロキノン、レゾルシノール、ナフタレンジオール等のＣ６－１４芳香族ジオール；ビフェノール；ビスフェノール類；キシリレングリコール等）等が挙げられる。さらに、必要に応じて、グリセリン、トリメチロールプロパン、トリメチロールエタン、ペンタエリスリトール等のポリオールを併用してもよい。 Examples of the diol include linear or branched aliphatic alkylene glycols other than 1,4-butanediol (for example, ethylene glycol, trimethylene glycol, propylene glycol, neopentyl glycol, hexanediol, octanediol, decanediol). Linear C 2-12 aliphatic glycols, preferably linear or branched C 2-10 aliphatic glycols), (poly) oxyalkylene glycols (glycols having a plurality of oxy C 2-4 alkylene units, for example Diethylene glycol, dipropylene glycol, ditetramethylene glycol, triethylene glycol, tripropylene glycol, polytetramethylene glycol, etc.), alicyclic diols (eg, 1,4-cyclohexanediol, 1,4-cyclohexane) Nji methanol, hydrogenated bisphenol A, etc.), aromatic diol (e.g., hydroquinone, resorcinol, C 6-14 aromatic diols such as naphthalene diol; biphenol; bisphenols; xylylene glycol and the like) and the like. Furthermore, you may use together polyols, such as glycerol, a trimethylol propane, a trimethylol ethane, a pentaerythritol, as needed.
　前記ビスフェノール類としては、ビス（４－ヒドロキシフェニル）メタン（ビスフェノールＦ）、１，１－ビス（４－ヒドロキシフェニル）エタン（ビスフェノールＡＤ）、１，１－ビス（４－ヒドロキシフェニル）プロパン、２，２－ビス（４－ヒドロキシフェニル）プロパン（ビスフェノールＡ）、２，２－ビス（４－ヒドロキシ－３－メチルフェニル）プロパン、２，２－ビス（４－ヒドロキシフェニル）ブタン、２，２－ビス（４－ヒドロキシフェニル）－３－メチルブタン、２，２－ビス（４－ヒドロキシフェニル）ヘキサン、２，２－ビス（４－ヒドロキシフェニル）－４－メチルペンタン等のビス（ヒドロキシアリール）Ｃ１－６アルカン；１，１－ビス（４－ヒドロキシフェニル）シクロペンタン、１，１－ビス（４－ヒドロキシフェニル）シクロヘキサン等のビス（ヒドロキシアリール）Ｃ４－１０シクロアルカン；４，４’－ジヒドロキシジフェニルエーテル；４，４’－ジヒドロキシジフェニルスルホン；４，４’－ジヒドロキシジフェニルスルフィド；４，４’－ジヒドロキシジフェニルケトン、及びこれらのアルキレンオキサイド付加体が例示できる。アルキレンオキサイド付加体としては、ビスフェノール類（例えば、ビスフェノールＡ、ビスフェノールＡＤ、ビスフェノールＦ等）のＣ２－３アルキレンオキサイド付加体、例えば、２，２－ビス－［４－（２－ヒドロキシエトキシ）フェニル］プロパン、ジエトキシ化ビスフェノールＡ（ＥＢＰＡ）、２，２－ビス－［４－（２－ヒドロキシプロポキシ）フェニル］プロパン、ジプロポキシ化ビスフェノールＡ等が挙げられる。アルキレンオキサイド付加体において、アルキレンオキサイド（エチレンオキサイド、プロピレンオキサイド等のＣ２－３アルキレンオキサイド）の付加モル数は、各ヒドロキシル基に対して１～１０モル、好ましくは１～５モル程度である。 Examples of the bisphenols include bis (4-hydroxyphenyl) methane (bisphenol F), 1,1-bis (4-hydroxyphenyl) ethane (bisphenol AD), 1,1-bis (4-hydroxyphenyl) propane, , 2-bis (4-hydroxyphenyl) propane (bisphenol A), 2,2-bis (4-hydroxy-3-methylphenyl) propane, 2,2-bis (4-hydroxyphenyl) butane, 2,2- Bis (hydroxyaryl) C 1 such as bis (4-hydroxyphenyl) -3-methylbutane, 2,2-bis (4-hydroxyphenyl) hexane, 2,2-bis (4-hydroxyphenyl) -4-methylpentane -6 alkane; 1,1-bis (4-hydroxyphenyl) cyclopentane, 1,1-bis (4-hydride) Bis (hydroxyaryl) C 4-10 cycloalkanes such as loxyphenyl) cyclohexane; 4,4′-dihydroxydiphenyl ether; 4,4′-dihydroxydiphenylsulfone; 4,4′-dihydroxydiphenyl sulfide; 4,4′-dihydroxy Examples thereof include diphenyl ketone and these alkylene oxide adducts. Examples of the alkylene oxide adduct include C 2-3 alkylene oxide adducts of bisphenols (eg, bisphenol A, bisphenol AD, bisphenol F, etc.), such as 2,2-bis- [4- (2-hydroxyethoxy) phenyl. Propane, diethoxylated bisphenol A (EBPA), 2,2-bis- [4- (2-hydroxypropoxy) phenyl] propane, dipropoxylated bisphenol A and the like. In the alkylene oxide adduct, the number of added moles of alkylene oxide ( C2-3 alkylene oxide such as ethylene oxide and propylene oxide) is about 1 to 10 moles, preferably about 1 to 5 moles relative to each hydroxyl group.
　オキシカルボン酸には、例えば、オキシ安息香酸、オキシナフトエ酸、ヒドロキシフェニル酢酸、グリコール酸、オキシカプロン酸等のオキシカルボン酸又はこれらの誘導体等が含まれる。ラクトンには、プロピオラクトン、ブチロラクトン、バレロラクトン、カプロラクトン（例えば、ε－カプロラクトン等）等のＣ３－１２ラクトン等が含まれる。 Examples of the oxycarboxylic acid include oxybenzoic acid, oxynaphthoic acid, hydroxyphenylacetic acid, glycolic acid, oxycaproic acid and other oxycarboxylic acids or derivatives thereof. Lactones include C 3-12 lactones such as propiolactone, butyrolactone, valerolactone, caprolactone (eg, ε-caprolactone, etc.), and the like.
　好ましい共重合性モノマーとしては、ジオール類、又はジカルボン酸類が挙げられる。ジオール類としては、Ｃ２－６アルキレングリコール（エチレングリコール、トリメチレングリコール、プロピレングリコール、ヘキサンジオール等の直鎖状又は分岐鎖状アルキレングリコール等）、繰返し数が２～４程度のオキシアルキレン単位を有するポリオキシＣ２－４アルキレングリコール（ジエチレングリコール等）、ビスフェノール類（ビスフェノール類又はそのアルキレンオキサイド付加体等）等が挙げられる。ジカルボン酸類としては、Ｃ６－１２脂肪族ジカルボン酸（アジピン酸、ピメリン酸、スベリン酸、アゼライン酸、セバシン酸等）、カルボキシル基がアレーン環の非対称位置に置換した非対称芳香族ジカルボン酸、１，４－シクロヘキサンジメタノール等が挙げられる。これらの化合物のうち、芳香族化合物、例えば、ビスフェノール類（特にビスフェノールＡ）のアルキレンオキサイド付加体、及び非対称芳香族ジカルボン酸［フタル酸、イソフタル酸、及びその反応性誘導体（ジメチルイソフタル酸（ＤＭＩ）等の低級アルキルエステル等）］等が好ましい。 Preferable copolymerizable monomers include diols or dicarboxylic acids. Examples of the diol include C 2-6 alkylene glycol (linear or branched alkylene glycol such as ethylene glycol, trimethylene glycol, propylene glycol, hexanediol, etc.), and an oxyalkylene unit having a repeating number of about 2 to 4. And polyoxy C 2-4 alkylene glycol (diethylene glycol, etc.), bisphenols (bisphenols or alkylene oxide adducts thereof), etc. Dicarboxylic acids include C 6-12 aliphatic dicarboxylic acids (adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, etc.), asymmetric aromatic dicarboxylic acids in which the carboxyl group is substituted at the asymmetric position of the arene ring, 1, 4-cyclohexanedimethanol and the like can be mentioned. Among these compounds, aromatic compounds such as alkylene oxide adducts of bisphenols (particularly bisphenol A), and asymmetric aromatic dicarboxylic acids [phthalic acid, isophthalic acid, and reactive derivatives thereof (dimethylisophthalic acid (DMI)) Etc.) are preferred.
　ポリブチレンテレフタレート系樹脂としては、ホモポリエステル（ポリブチレンテレフタレート）及び／又は共重合体（ポリブチレンテレフタレートコポリエステル）が好ましく、共重合性モノマーの割合（変性量）は、通常、４５モル％以下（例えば、０～４０モル％程度）、好ましくは３５モル％以下（例えば、０～３５モル％程度）であってもよく、３０モル％以下（０～３０モル％程度）であってもよい。単独で使用する場合、共重合体において、共重合性モノマーの割合は、例えば、０．０１～３０モル％程度の範囲から選択でき、通常、１～３０モル％、好ましくは３～２５モル％、さらに好ましくは５～２０モル％（例えば、５～１５モル％）程度である。ホモポリエステルと併用する場合、共重合体において、共重合性モノマーの割合は、例えば、０．１～４５モル％程度の範囲から選択でき、通常、１～４０モル％（例えば、５～４０モル％）、好ましくは１０～３５モル％程度であってもよい。 The polybutylene terephthalate resin is preferably a homopolyester (polybutylene terephthalate) and / or a copolymer (polybutylene terephthalate copolyester), and the proportion (modification amount) of the copolymerizable monomer is usually 45 mol% or less ( For example, it may be about 0 to 40 mol%), preferably 35 mol% or less (for example, about 0 to 35 mol%), or 30 mol% or less (about 0 to 30 mol%). When used alone, the proportion of the copolymerizable monomer in the copolymer can be selected, for example, from the range of about 0.01 to 30 mol%, and is usually 1 to 30 mol%, preferably 3 to 25 mol%. More preferably, it is about 5 to 20 mol% (for example, 5 to 15 mol%). When used in combination with a homopolyester, the proportion of the copolymerizable monomer in the copolymer can be selected from the range of, for example, about 0.1 to 45 mol%, and is usually 1 to 40 mol% (eg, 5 to 40 mol%) %), Preferably about 10 to 35 mol%.
　なお、ホモポリエステル（ポリブチレンテレフタレート）と共重合体とを組み合わせて使用する場合、ホモポリエステルとコポリエステルとの割合は、共重合性モノマーの割合が、全単量体に対して０．１～３０モル％（好ましくは１～２５モル％、さらに好ましくは５～２５モル％）程度となる範囲であり、通常、ホモポリエステル／コポリエステルの質量比は、９９／１～１／９９、好ましくは９５／５～５／９５、さらに好ましくは９０／１０～１０／９０程度の範囲から選択できる。 When a homopolyester (polybutylene terephthalate) and a copolymer are used in combination, the ratio of the homopolyester and the copolyester is such that the ratio of the copolymerizable monomer is 0.1 to The range is about 30 mol% (preferably 1 to 25 mol%, more preferably 5 to 25 mol%), and the mass ratio of homopolyester / copolyester is usually 99/1 to 1/99, preferably It can be selected from the range of about 95/5 to 5/95, more preferably about 90/10 to 10/90.
　ポリブチレンテレフタレート系樹脂は、テレフタル酸又はその反応性誘導体と１，４－ブタンジオールと必要により共重合可能なモノマーとを、慣用の方法、例えば、エステル交換、直接エステル化法等により共重合することにより製造できる。 The polybutylene terephthalate resin is obtained by copolymerizing terephthalic acid or a reactive derivative thereof and 1,4-butanediol with a monomer that can be copolymerized as necessary by a conventional method such as transesterification or direct esterification. Can be manufactured.
　ポリブチレンテレフタレート系樹脂の含有量は、全樹脂組成物中５０質量％以上１００質量％未満とすることができ、好ましくは、６０質量％以上１００質量％未満とすることができ、より好ましくは６５質量％以上９９．９質量％以下とすることができる。 The content of the polybutylene terephthalate resin can be 50% by mass or more and less than 100% by mass in the total resin composition, preferably 60% by mass or more and less than 100% by mass, and more preferably 65% by mass. It can be set to mass% or more and 99.9 mass% or less.
（レーザー光透過性向上剤）
　レーザー光透過性向上剤は、不透明な樹脂であるポリブチレンテレフタレート系樹脂組成物のレーザー光透過性を向上させる作用を有する無機材料である。樹脂組成物のレーザー光の透過性が高まるので、樹脂組成物を用いて製造された成形品をレーザー溶着の透過側成形品として用いることができる。 (Laser light transmission improver)
The laser light transmission improving agent is an inorganic material having an action of improving the laser light transmission of the polybutylene terephthalate resin composition which is an opaque resin. Since the transmittance of the laser light of the resin composition is increased, a molded product manufactured using the resin composition can be used as a transmission-side molded product for laser welding.
　レーザー光透過性向上剤は、層状ケイ酸塩鉱物を含む。レーザー光透過性向上剤は、層状ケイ酸塩鉱物であるように構成することもできる。層状ケイ酸塩鉱物は、通常は、得られる成形体の機械的物性を向上させるための無機充填剤として用いられる場合が多く、無機充填剤を含有する樹脂は、光が散乱されて光透過性が低下することが知られている。しかしながら、本発明者の研究により、所定の粒径を有する層状ケイ酸塩鉱物は、ポリブチレンテレフタレート系樹脂のレーザー光透過性を向上させる作用を有することが新たに分かった。よって、本実施形態では、所定の粒径の層状ケイ酸塩鉱物をレーザー光透過性向上剤として用いる。 The laser light transmission improver contains a layered silicate mineral. The laser light transmission improver can also be configured to be a layered silicate mineral. Layered silicate minerals are usually often used as inorganic fillers to improve the mechanical properties of the resulting molded body. Resins containing inorganic fillers are light transmissive due to light scattering. Is known to decrease. However, the present inventors' research has newly revealed that a layered silicate mineral having a predetermined particle size has an effect of improving the laser light transmittance of a polybutylene terephthalate resin. Therefore, in this embodiment, a layered silicate mineral having a predetermined particle size is used as a laser light transmission improver.
　層状ケイ酸塩鉱物は、少なくとも金属酸化物成分とＳｉＯ２成分とからなる層状の鉱物である。層状ケイ酸塩鉱物としては、例えば、タルク、マイカ、カオリン、パイロフィライト、セリサイト、バーミキュライト、スメクタイト、ベントナイト、スチーブンサイト、モンモリロナイト、バイデライト、サポナイト、ヘクトライト、ノントロナイト等を挙げることができ、これらから選ばれる１種又は２種以上を用いることができる。中でも、タルクが好ましい。層状ケイ酸塩鉱物は、表面が処理されたものでもよく無処理のものであってもよい。また、天然物に対応する人工合成物を使用することもできる。人工合成物としては、従来公知の各種の方法、例えば固体反応、水熱反応、および超高圧反応などを利用した各種の合成法から得られたケイ酸塩鉱物が利用できる。 The layered silicate mineral is a layered mineral composed of at least a metal oxide component and a SiO 2 component. Examples of layered silicate minerals include talc, mica, kaolin, pyrophyllite, sericite, vermiculite, smectite, bentonite, stevensite, montmorillonite, beidellite, saponite, hectorite, nontronite and the like. , One or more selected from these can be used. Of these, talc is preferable. The layered silicate mineral may be treated or untreated. In addition, an artificial synthetic product corresponding to a natural product can also be used. As the artificial synthetic material, silicate minerals obtained from various synthetic methods using conventionally known various methods such as solid reaction, hydrothermal reaction, and ultrahigh pressure reaction can be used.
　層状ケイ酸塩鉱物の平均一次粒子径は、１．０μｍ以上５．０μｍ以下である。平均一次粒子径が１．０μｍ以上５．０μｍ以下である場合に、ポリブチレンテレフタレート系樹脂のレーザー光透過性を向上させることができる。平均一次粒子径は、好ましくは、１．５μｍ以上５．０μｍ未満であり、より好ましくは、２．０μｍ以上又は２．０μｍを超え、４．０μｍ以下又は４．０μｍ未満である。なお、「平均一次粒子径」とは、樹脂組成物に配合される前の層状ケイ酸塩鉱物について、ＣＣＤカメラで撮影した画像を解析し、加重平均により算出した値である。例えば、株式会社セイシン企業製、動的画像解析法／粒子（状態）分析計ＰＩＴＡ－３等を用いて算出することができる。層状ケイ酸塩鉱物のアスペクト比は、特に限定されず、例えば、１以上１０以下とすることができる。 The average primary particle diameter of the layered silicate mineral is 1.0 μm or more and 5.0 μm or less. When the average primary particle diameter is 1.0 μm or more and 5.0 μm or less, the laser light transmittance of the polybutylene terephthalate resin can be improved. The average primary particle diameter is preferably 1.5 μm or more and less than 5.0 μm, more preferably 2.0 μm or more or more than 2.0 μm, or less than 4.0 μm or less than 4.0 μm. The “average primary particle size” is a value calculated by weighted average of the layered silicate mineral before blended with the resin composition by analyzing an image taken with a CCD camera. For example, it can be calculated using a dynamic image analysis method / particle (state) analyzer PITA-3 manufactured by Seishin Corporation. The aspect ratio of the layered silicate mineral is not particularly limited, and can be, for example, 1 or more and 10 or less.
　レーザー光透過性向上剤の含有量は、ポリブチレンテレフタレート系樹脂１００質量部に対して、０．０１質量部以上２０質量部以下とすることが好ましい。より好ましくは、０．５質量部以上１５質量部以下であり、さらに好ましくは、１．０質量部以上１５質量部未満である。下限値は、５．０質量部以上とすることもできる。層状ケイ酸塩鉱物の含有量が０．０１質量部以上２０質量部以下の範囲内の場合に、ポリブチレンテレフタレート系樹脂のレーザー光透過性をより向上させることができる。また、層状ケイ酸塩鉱物の含有量が０．０１質量部以上のポリブチレンテレフタレート系樹脂組成物を用いた成形品は、成形品内におけるレーザー光透過率のバラつきを小さくすることができる。 The content of the laser light transmission improver is preferably 0.01 parts by mass or more and 20 parts by mass or less with respect to 100 parts by mass of the polybutylene terephthalate resin. More preferably, they are 0.5 mass part or more and 15 mass parts or less, More preferably, they are 1.0 mass part or more and less than 15 mass parts. A lower limit can also be 5.0 mass parts or more. When the content of the layered silicate mineral is in the range of 0.01 parts by mass or more and 20 parts by mass or less, the laser light transmittance of the polybutylene terephthalate resin can be further improved. In addition, a molded article using a polybutylene terephthalate resin composition having a layered silicate mineral content of 0.01 parts by mass or more can reduce variations in laser light transmittance in the molded article.
（無機充填剤）
　本実施形態の樹脂組成物は、得られる成形品の機械的物性を向上させる目的で、無機充填剤を含んでいてもよい。無機充填剤としては、繊維状充填剤、板状充填剤、又は粉粒状充填剤を挙げることができる。繊維状充填剤としては、例えば、ガラス繊維、アスベスト繊維、カーボン繊維、シリカ繊維、アルミナ繊維、シリカ－アルミナ繊維、アルミニウムシリケート繊維、ジルコニア繊維、チタン酸カリウム繊維、炭化ケイ素繊維、ウィスカー（炭化ケイ素、アルミナ、窒化珪素等のウィスカー）等の無機質繊維；脂肪族又は芳香族ポリアミド、芳香族ポリエステル、フッ素樹脂、ポリアクリロニトリル等のアクリル樹脂、レーヨン等で形成された繊維等の有機質繊維を挙げることができる。板状充填剤としては、例えば、タルク、マイカ、ガラスフレーク、グラファイト等を挙げることができる。粉粒状充填剤としては、例えば、ガラスビーズ、ガラス粉、ミルドファイバー（例えば、ミルドガラスファイバー等）、ウォラストナイト（珪灰石）等を挙げることができる。なお、ウォラストナイトは、板状、柱状、繊維状等の形態であってもよい。これらの無機充填剤のうち、安価であり入手しやすいこと等から、ガラス繊維が好ましい。 (Inorganic filler)
The resin composition of the present embodiment may contain an inorganic filler for the purpose of improving the mechanical properties of the obtained molded product. As an inorganic filler, a fibrous filler, a plate-like filler, or a granular filler can be mentioned. Examples of the fibrous filler include glass fiber, asbestos fiber, carbon fiber, silica fiber, alumina fiber, silica-alumina fiber, aluminum silicate fiber, zirconia fiber, potassium titanate fiber, silicon carbide fiber, whisker (silicon carbide, Inorganic fibers such as whiskers such as alumina and silicon nitride); organic fibers such as aliphatic or aromatic polyamides, aromatic polyesters, acrylic resins such as fluororesin and polyacrylonitrile, fibers formed of rayon, etc. . Examples of the plate-like filler include talc, mica, glass flake, and graphite. Examples of the particulate filler include glass beads, glass powder, milled fiber (for example, milled glass fiber), wollastonite (wollastonite), and the like. The wollastonite may be in the form of a plate, column, fiber, or the like. Of these inorganic fillers, glass fiber is preferable because it is inexpensive and easily available.
　繊維状充填剤の平均径は、例えば、１μｍ～３０μｍ（好ましくは３μｍ～２０μｍ）程度、平均長は、例えば、１００μｍ～５ｍｍ（好ましくは３００μｍ～４ｍｍ、さらに好ましくは５００μｍ～３．５ｍｍ）程度であってもよい。また、板状又は粉粒状充填剤の平均一次粒子径は、例えば、１０μｍ～５００μｍ、好ましくは１５μｍ～１００μｍ程度とすることができる。これらの無機充填剤は、単独で又は二種以上組み合わせて使用することができる。なお、繊維状充填剤の平均径及び平均長、並びに板状又は粉状充填剤の平均一次粒子径は、樹脂組成物中に配合される前の繊維状充填剤、板状又は粉状充填剤について、ＣＣＤカメラで撮影した画像を解析し、加重平均により算出した値であり、上記層状ケイ酸塩鉱物の平均一次粒子径の測定で用いる装置と同様の装置を用いて算出することができる。 The average diameter of the fibrous filler is, for example, about 1 μm to 30 μm (preferably 3 μm to 20 μm), and the average length is, for example, about 100 μm to 5 mm (preferably 300 μm to 4 mm, more preferably 500 μm to 3.5 mm). There may be. Further, the average primary particle diameter of the plate-like or granular filler can be, for example, about 10 μm to 500 μm, preferably about 15 μm to 100 μm. These inorganic fillers can be used alone or in combination of two or more. The average diameter and average length of the fibrous filler and the average primary particle diameter of the plate-like or powdery filler are the fibrous filler, plate-like or powdery filler before being mixed in the resin composition. Is a value calculated by analyzing an image photographed with a CCD camera and calculating a weighted average, and can be calculated using a device similar to the device used in the measurement of the average primary particle diameter of the layered silicate mineral.
　無機充填剤の含有割合は、ポリブチレンテレフタレート系樹脂１００質量部に対して、５質量部以上１００質量部以下、好ましくは１０質量部以上８０質量部以下、より好ましくは１５質量部以上６０質量部以下とすることができる。この数値範囲内とすることで、上記したレーザー光透過性向上剤の作用を維持しつつ、得られる成形体の機械的物性や寸法精度を向上させることができる。 The content of the inorganic filler is 5 parts by mass or more and 100 parts by mass or less, preferably 10 parts by mass or more and 80 parts by mass or less, more preferably 15 parts by mass or more and 60 parts by mass with respect to 100 parts by mass of the polybutylene terephthalate resin. It can be as follows. By setting it within this numerical range, it is possible to improve the mechanical properties and dimensional accuracy of the obtained molded product while maintaining the action of the above-described laser light transmission improving agent.
（他の添加物）
　樹脂組成物には、種々の添加剤、例えば、安定剤（酸化防止剤、紫外線吸収剤、熱安定剤等）、難燃剤、滑剤、離型剤、帯電防止剤、染顔料等の着色剤、分散剤、可塑剤、核剤等を添加してもよい。この場合の添加物の含有量は、例えば、ポリブチレンテレフタレート系樹脂１００質量部に対して、０質量部を超え２０質量部以下とすることができる。なお、着色剤については、意匠面の要求から、レーザー光吸収側成形品と同様の色目、特に黒色系への着色が必要となる場合、レーザー光透過性を損なわないよう、染料系の着色剤を用いるか、あるいはレーザー光透過率を損なわない顔料（例えばＢＡＳＦ社のルモゲンブラックなど）を用いることが望ましい。 (Other additives)
Various additives such as stabilizers (antioxidants, ultraviolet absorbers, heat stabilizers, etc.), flame retardants, lubricants, mold release agents, antistatic agents, coloring agents such as dyes and pigments, You may add a dispersing agent, a plasticizer, a nucleating agent, etc. In this case, the content of the additive can be, for example, more than 0 parts by mass and 20 parts by mass or less with respect to 100 parts by mass of the polybutylene terephthalate resin. As for the colorant, if it is necessary to color the same color as the laser light absorption side molded product, in particular, black, due to the requirement of the design surface, a dye-based colorant so as not to impair the laser light transmittance. Or a pigment that does not impair the laser light transmittance (for example, BASF Lummogen Black) is desirable.
　また、樹脂組成物には、必要に応じて、他の樹脂（熱可塑性樹脂、熱硬化性樹脂等）を含有することもできる。他の樹脂としては、オレフィン系エラストマー、スチレン系エラストマー、ポリエステル系エラストマー、コアシェルポリマー等を挙げることができる。 The resin composition can also contain other resins (thermoplastic resin, thermosetting resin, etc.) as necessary. Examples of other resins include olefin elastomers, styrene elastomers, polyester elastomers, and core-shell polymers.
　本実施形態のポリブチレンテレフタレート系樹脂組成物は、レーザー光透過性向上剤を含有するので、透明性の高い樹脂をアロイ材として添加しなくても、レーザー光透過性を有している。そのため、樹脂組成物は、アロイ材を含有しないように構成することもできる。一方、樹脂組成物のレーザー光透過性をより一層高めるために、アロイ材を添加することもできる。アロイ材としては、ポリカーボネート系樹脂、ポリエチレンテレフタレート系樹脂、スチレン系樹脂等を挙げることができる。アロイ材を添加する場合、その含有量は、従来のＰＢＴ系樹脂組成物に対する添加量よりも低くすることができ、例えば、ポリブチレンテレフタレート系樹脂１００質量部に対して、０質量部を超え４０質量部以下（例えば２０質量部）とすることができる。 Since the polybutylene terephthalate resin composition of the present embodiment contains a laser light transmission improver, it has a laser light transmission property without adding a highly transparent resin as an alloy material. Therefore, the resin composition can be configured not to contain an alloy material. On the other hand, an alloy material can also be added in order to further enhance the laser light transmittance of the resin composition. Examples of the alloy material include a polycarbonate resin, a polyethylene terephthalate resin, and a styrene resin. When the alloy material is added, the content thereof can be made lower than the amount added to the conventional PBT resin composition. For example, the content exceeds 0 part by mass with respect to 100 parts by mass of the polybutylene terephthalate resin. It can be below mass parts (for example, 20 mass parts).
（樹脂組成物）
　本実施形態の樹脂組成物は、粉粒体混合物や溶融混合物（ペレット等）であってもよい。この樹脂組成物を用いて形成された成形品は、レーザー光透過性向上剤を含有しないポリブチレンテレフタレート系樹脂組成物を用いて形成された成形品よりも、レーザー光の透過率が高い。そのため、樹脂組成物は、レーザー溶着するための成形品を製造するのに適している。特に、レーザー光透過側成形品を製造するのに適している。 (Resin composition)
The resin composition of the present embodiment may be a powder mixture or a molten mixture (pellets or the like). A molded article formed using this resin composition has a higher laser beam transmittance than a molded article formed using a polybutylene terephthalate-based resin composition that does not contain a laser beam transmission improver. Therefore, the resin composition is suitable for producing a molded product for laser welding. In particular, it is suitable for manufacturing a laser light transmission side molded product.
［成形品］
　成形品は、上記した樹脂組成物を用いて形成することができ、上記樹脂組成物を含む。この成形品は、光路長１．５ｍｍにおける波長８００ｎｍ～１０００ｎｍのレーザー光透過率が、レーザー光透過性向上剤を含有しないポリブチレンテレフタレート系樹脂組成物を用いて形成された成形品よりも高い。レーザー光透過性は、例えば、射出成形により形成された縦８０ｍｍ×横８０ｍｍ×厚み１．５ｍｍ（サイドゲート、ゲート幅２ｍｍ）の成形品において、８００ｎｍ～１０００ｎｍの波長のレーザー光透過率が２０％以上、例えば２３％以上である。なお、レーザー光透過率は、分光光度計を用いて測定した値である。 [Molding]
The molded product can be formed using the above-described resin composition, and includes the above-described resin composition. This molded product has a higher laser light transmittance at a wavelength of 800 nm to 1000 nm at an optical path length of 1.5 mm than a molded product formed using a polybutylene terephthalate resin composition that does not contain a laser light transmission improver. The laser light transmittance is, for example, 20% of the laser light transmittance at a wavelength of 800 nm to 1000 nm in a molded product of 80 mm long × 80 mm wide × 1.5 mm thick (side gate, gate width 2 mm) formed by injection molding. For example, it is 23% or more. The laser light transmittance is a value measured using a spectrophotometer.
　成形品は、樹脂組成物を慣用の方法で成形して得ることができる。例えば、（１）各成分を混合して、一軸又は二軸の押出機により混練し押出してペレットを調製した後、成形する方法、（２）一旦、組成の異なるペレット（マスターバッチ）を調製し、そのペレットを所定量混合（希釈）して成形に供し、所定の組成の成形品を得る方法、（３）成形機に各成分の１又は２以上を直接仕込む方法、等で製造できる。なお、ペレットは、例えば、脆性成分（ガラス系補強材等）を除く成分を溶融混合した後に、脆性成分（ガラス系補強材等）を混合することにより調製してもよい。 The molded product can be obtained by molding the resin composition by a conventional method. For example, (1) A method in which each component is mixed, kneaded by a single or twin screw extruder and extruded to prepare pellets, and then molded. (2) A pellet (master batch) having a different composition is once prepared. The pellets can be mixed (diluted) in a predetermined amount and subjected to molding to obtain a molded product having a predetermined composition, or (3) a method in which one or more of each component is directly charged into a molding machine. The pellets may be prepared by, for example, melting and mixing components excluding brittle components (such as glass-based reinforcing materials) and then mixing brittle components (such as glass-based reinforcing materials).
　成形方法は、押出成形、射出成形、圧縮成形、ブロー成形、真空成形、回転成形、ガスインジェクションモールディング等の慣用の方法を用いることができるが、通常、射出成形により成形される。 As the molding method, conventional methods such as extrusion molding, injection molding, compression molding, blow molding, vacuum molding, rotational molding, gas injection molding, etc. can be used, but usually molding is performed by injection molding.
　成形品の形状は、特に制限されないが、成形品をレーザー溶着により相手材（他の樹脂成形品）と接合して用いるため、通常、少なくとも接触面（平面等）を有する形状（例えば、板状）である。また、本発明の成形体はレーザー光に対する透過性が高いので、レーザー光が透過する部位の成形品の厚み（レーザー光が透過する方向の厚み）は、広い範囲から選択でき、例えば、０．３ｍｍ～５ｍｍ、好ましくは０．５ｍｍ～３ｍｍ（例えば、１ｍｍ～２ｍｍ）程度であってもよい。 The shape of the molded product is not particularly limited, but since the molded product is used by joining with a mating material (other resin molded product) by laser welding, it usually has a shape having at least a contact surface (such as a flat surface) (for example, a plate shape) ). In addition, since the molded article of the present invention has high permeability to the laser beam, the thickness of the molded article (the thickness in the direction in which the laser beam is transmitted) at the site where the laser beam is transmitted can be selected from a wide range. It may be about 3 mm to 5 mm, preferably about 0.5 mm to 3 mm (for example, 1 mm to 2 mm).
　前記成形品は、レーザー溶着性に優れているため、通常、レーザー溶着により相手材の樹脂成形品と溶着させるのが好ましいが、必要であれば、他の熱溶着法、例えば、振動溶着法、超音波溶着法、熱板溶着法等により他の樹脂成形品と溶着させることもできる。 Since the molded product is excellent in laser weldability, it is usually preferable to weld the resin molded product of the counterpart material by laser welding, but if necessary, other thermal welding methods, for example, vibration welding method, It can also be welded to other resin molded products by ultrasonic welding, hot plate welding, or the like.
［複合成形品］
　複合成形品は、ポリブチレンテレフタレート系樹脂組成物を用いて形成され該樹脂組成物を含む第１の成形品と、熱可塑性樹脂組成物を用いて形成され該熱可塑性樹脂組成物を含む第２の成形品とが、レーザー溶着された複合成形品である。第１の成形品と、第２の成形品とは、レーザー溶着により接合され一体化されている。複合成形品は、ポリブチレンテレフタレート系樹脂組成物を含む第１の成形品の少なくとも一部と、熱可塑性樹脂組成物を含む第２の成形品の少なくとも一部とを重ね合せ、第１の成形品側からレーザー光を照射して第１の成形品の少なくとも一部と第２の成形品の少なくとも一部とを溶着して得ることができる。レーザー光を照射することにより、第１の成形品と第２の成形品との界面が少なくとも部分的に溶融して接合面が密着され、その後、冷却することにより二種の成形品を接合、一体化して１つの複合成形体とすることができる。 [Composite molded product]
The composite molded article includes a first molded article formed using a polybutylene terephthalate resin composition and including the resin composition, and a second molded article formed using the thermoplastic resin composition and including the thermoplastic resin composition. The molded article is a laser-welded composite molded article. The first molded product and the second molded product are joined and integrated by laser welding. The composite molded article is formed by superimposing at least a part of the first molded article containing the polybutylene terephthalate resin composition and at least a part of the second molded article containing the thermoplastic resin composition. It can be obtained by irradiating laser light from the product side and welding at least a part of the first molded product and at least a part of the second molded product. By irradiating with laser light, the interface between the first molded product and the second molded product is at least partially melted to bring the joining surface into close contact, and then the two molded products are joined by cooling. It can be integrated into one composite molded body.
　第２の成形品を構成する熱可塑性樹脂組成物としては、前記ポリブチレンテレフタレート系樹脂と相溶性のある樹脂組成物であれば特に制限されず、例えば、オレフィン系樹脂、ビニル系樹脂、スチレン系樹脂、アクリル系樹脂、ポリエステル系樹脂、ポリアミド系樹脂、ポリカーボネート系樹脂等を含む樹脂組成物を挙げることができる。これらの樹脂のうち、前記ポリブチレンテレフタレート系樹脂を構成する樹脂と同種類又は同系統の樹脂（ＰＢＴ系樹脂、ＰＥＴ系樹脂等の芳香族ポリエステル系樹脂）、ポリカーボネート系樹脂又はその組成物で相手材を構成してもよい。例えば、第１の成形体を本実施形態のポリブチレンテレフタレート系樹脂組成物で形成し、第２の成形体を、レーザー光透過性向上剤を含有しないポリブチレンテレフタレート系樹脂で形成してもよい。 The thermoplastic resin composition constituting the second molded product is not particularly limited as long as it is a resin composition compatible with the polybutylene terephthalate resin, and examples thereof include olefin resins, vinyl resins, and styrene resins. Examples of the resin composition include a resin, an acrylic resin, a polyester resin, a polyamide resin, and a polycarbonate resin. Among these resins, the same type or the same type of resins as those constituting the polybutylene terephthalate resin (aromatic polyester resins such as PBT resins and PET resins), polycarbonate resins or compositions thereof You may comprise material. For example, the first molded body may be formed of the polybutylene terephthalate resin composition of the present embodiment, and the second molded body may be formed of a polybutylene terephthalate resin that does not contain a laser light transmission improver. .
　第２の成形品は、レーザー光に対する吸収剤又は着色剤を含んでいてもよい。前記着色剤は、レーザー光の波長に応じて選択でき、無機顔料又は有機顔料を用いることができる。無機顔料としては、カーボンブラック（例えば、アセチレンブラック、ランプブラック、サーマルブラック、ファーネスブラック、チャンネルブラック、ケッチェンブラック等）等の黒色顔料、酸化鉄赤等の赤色顔料、モリブデートオレンジ等の橙色顔料、酸化チタン等の白色顔料等を挙げることができる。有機顔料としては、黄色顔料、橙色顔料、赤色顔料、青色顔料、緑色顔料等を挙げることができる。これらの吸収剤は単独で又は二種以上組み合わせて使用できる。吸収剤としては、通常、黒色顔料又は染料、特にカーボンブラックが使用できる。カーボンブラックの平均粒子径は、通常、１ｎｍ～１０００ｎｍ、好ましくは１０ｎｍ～１００ｎｍ程度であってもよい。着色剤の割合は、第２の成形品構成する組成物全体に対して０．１質量％～１０質量％、好ましくは０．５質量％～５質量％（例えば、０．５質量％～３質量％）程度である。 The second molded product may contain an absorber or a colorant for laser light. The colorant can be selected according to the wavelength of the laser beam, and an inorganic pigment or an organic pigment can be used. Inorganic pigments include black pigments such as carbon black (for example, acetylene black, lamp black, thermal black, furnace black, channel black, ketjen black), red pigments such as iron oxide red, and orange pigments such as molybdate orange. And white pigments such as titanium oxide. Examples of the organic pigment include a yellow pigment, an orange pigment, a red pigment, a blue pigment, and a green pigment. These absorbents can be used alone or in combination of two or more. As the absorbent, usually black pigments or dyes, particularly carbon black can be used. The average particle size of carbon black may be usually about 1 nm to 1000 nm, preferably about 10 nm to 100 nm. The ratio of the colorant is 0.1% by mass to 10% by mass, preferably 0.5% by mass to 5% by mass (for example, 0.5% by mass to 3% by mass) with respect to the entire composition constituting the second molded article. Mass%).
　レーザー光の照射は、通常、第１の成形体側から第２の成形体の方向に向けて行われ、光吸収性を有する第２の成形体の界面で発熱させることにより、第１の成形体と第２の成形体とを融着させる。なお、必要によりレンズ系を利用して、第１の成形品と第２の成形品との界面にレーザー光を集光させ接触界面を融着してもよい。レーザー光源としては、特に制限されず、例えば、色素レーザ、気体レーザ（エキシマレーザ、アルゴンレーザ、クリプトンレーザ、ヘリウム－ネオンレーザ等）、固体レーザ（ＹＡＧレーザ等）、半導体レーザ等が利用できる。レーザー光としては、通常、パルスレーザが利用される。 Irradiation with laser light is usually performed from the first molded body side toward the second molded body, and heat is generated at the interface of the second molded body having light absorption, thereby the first molded body. And the second molded body are fused. If necessary, a lens system may be used to focus the laser beam on the interface between the first molded product and the second molded product and fuse the contact interface. The laser light source is not particularly limited, and for example, a dye laser, a gas laser (excimer laser, argon laser, krypton laser, helium-neon laser, etc.), a solid laser (YAG laser, etc.), a semiconductor laser, and the like can be used. As the laser light, a pulse laser is usually used.
（用途）
　本実施形態で得られる複合成形品は、高い溶着強度を有し、レーザー光照射によるＰＢＴ系樹脂の損傷も少ないため、種々の用途、例えば、電気・電子部品、オフィスオートメート（ＯＡ）機器部品、家電機器部品、機械機構部品、自動車機構部品等に適用できる。特に、自動車電装部品（各種コントロールユニット、イグニッションコイル部品等）、モーター部品、各種センサー部品、コネクター部品、スイッチ部品、リレー部品、コイル部品、トランス部品、ランプ部品等に好適に用いることができる。 (Use)
The composite molded product obtained in the present embodiment has high welding strength and little damage to the PBT resin due to laser light irradiation. Therefore, various applications such as electrical / electronic parts, office automate (OA) equipment parts, etc. It can be applied to home appliance parts, machine mechanism parts, automobile mechanism parts and the like. In particular, it can be suitably used for automobile electrical parts (various control units, ignition coil parts, etc.), motor parts, various sensor parts, connector parts, switch parts, relay parts, coil parts, transformer parts, lamp parts, and the like.
［ＰＢＴ系樹脂組成物のレーザー光透過性向上方法］
　ポリブチレンテレフタレート系樹脂組成物のレーザー光透過性向上方法は、ポリブチレンテレフタレート系樹脂組成物に、平均一次粒子径が１．０μｍ以上５．０μｍ以下の層状ケイ酸塩鉱物を配合するというものである。これにより、ポリブチレンテレフタレート系樹脂組成物のレーザー光透過性を向上することができ、ポリブチレンテレフタレート系樹脂組成物を、レーザー溶着に用いる透過側成形品の製造に用いることができる。このメカニズムは現段階では明らかではないが、後述する実施例に示すように、所定の粒径を有する層状ケイ酸塩鉱物を含むポリブチレンテレフタレート系樹脂組成物は、層状ケイ酸塩鉱物を含まない場合や、粒径が所定の範囲外の層状ケイ酸塩鉱物を含有する場合よりも、レーザー光透過性が向上した。層状ケイ酸塩鉱物の種類や含有量及び好ましい粒子径の範囲については、上述のとおりであるのでここでは記載を省略する。 [Method for Improving Laser Light Transmittance of PBT Resin Composition]
The method for improving the laser light transmittance of a polybutylene terephthalate resin composition is that a layered silicate mineral having an average primary particle diameter of 1.0 μm or more and 5.0 μm or less is blended with a polybutylene terephthalate resin composition. is there. Thereby, the laser beam transmittance of the polybutylene terephthalate resin composition can be improved, and the polybutylene terephthalate resin composition can be used for the production of a transmission side molded product used for laser welding. Although this mechanism is not clear at this stage, the polybutylene terephthalate-based resin composition containing a layered silicate mineral having a predetermined particle size does not contain a layered silicate mineral, as shown in Examples described later. In some cases, the laser light transmittance was improved as compared with the case where a layered silicate mineral having a particle size outside the predetermined range was contained. The type and content of the layered silicate mineral and the preferable range of the particle diameter are as described above, and are not described here.
　以下に実施例を示して本発明を更に具体的に説明するが、これらの実施例により本発明の解釈が限定されるものではない。 EXAMPLES The present invention will be described more specifically with reference to the following examples. However, the interpretation of the present invention is not limited by these examples.
［実施例１～４、比較例１～４］
　以下に示す材料を用い、表１，２に示す含有割合で２軸押出機（日本製鋼所株式会社製、３０ｍｍφ）により２５０℃にて混錬しペレットを作製した。なお、タルクの平均一次粒子径は、株式会社セイシン企業製、動的画像解析法／粒子（状態）分析計ＰＩＴＡ－３を用いて測定した。 [Examples 1 to 4, Comparative Examples 1 to 4]
Using the materials shown below, pellets were produced by kneading at 250 ° C. with a twin-screw extruder (manufactured by Nippon Steel Works, 30 mmφ) at the content ratios shown in Tables 1 and 2. The average primary particle diameter of talc was measured using a dynamic image analysis method / particle (state) analyzer PITA-3 manufactured by Seishin Enterprise Co., Ltd.
　ポリブチレンテレフタレート系樹脂（ＰＢＴ）：ウィンテックポリマー社製、固有粘度０．９５ｄｌ／ｇのＰＢＴ
　タルク１：平均一次粒子径２．６μｍのタルク
　タルク２：平均一次粒子径３．４μｍのタルク
　タルク３：平均一次粒子径６．２μｍのタルク
　タルク４：平均一次粒子径０．６μｍのタルク
　ガラス繊維（ＧＦ）：日本電気硝子社製、商品名「ＥＣＳ０３Ｔ－１８７」、平均径１３μｍ、平均長３ｍｍ Polybutylene terephthalate resin (PBT): PBT having an intrinsic viscosity of 0.95 dl / g, manufactured by Wintech Polymer Co., Ltd.
Talc 1: Talc with an average primary particle size of 2.6 μm Talc 2: Talc with an average primary particle size of 3.4 μm Talc 3: Talc with an average primary particle size of 6.2 μm Talc 4: Talc glass fibers with an average primary particle size of 0.6 μm (GF): manufactured by Nippon Electric Glass Co., Ltd., trade name “ECS03T-187”, average diameter 13 μm, average length 3 mm
［評価］
　実施例及び比較例で得られたペレットを用いて、射出成形機（ファナック株式会社製）により、シリンダー温度２６０℃及び金型温度８０℃の条件で成形品（縦８ｃｍ×横８ｃｍ×厚さ１．５ｍｍ、サイドゲート）を成形した。 [Evaluation]
Using the pellets obtained in the examples and comparative examples, a molded product (length 8 cm × width 8 cm × thickness 1) on an injection molding machine (manufactured by FANUC CORPORATION) under the conditions of a cylinder temperature of 260 ° C. and a mold temperature of 80 ° C. .5 mm, side gate).
（レーザー光透過率）
　得られた成形品のゲート側部から２ｃｍ×２ｃｍを切り出して試験片とし、積分球を使用した分光光度計（日本分光社製、型式：Ｖ５７０）を用いて、波長９４０ｎｍでの試験片のレーザー光透過率を測定した。結果を表１，２に示した。 (Laser light transmittance)
2 cm × 2 cm was cut out from the gate side portion of the obtained molded product to make a test piece, and a test piece laser at a wavelength of 940 nm was used using a spectrophotometer (manufactured by JASCO Corporation, model: V570) using an integrating sphere. The light transmittance was measured. The results are shown in Tables 1 and 2.
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000002
Figure JPOXMLDOC01-appb-T000002
　表１，２から明らかなように、実施例１～４の樹脂組成物を用いて形成された成形品は、層状ケイ酸塩鉱物を含有しない樹脂組成物を用いて形成された比較例１の成形品、及び、粒径が所定の範囲外である層状ケイ酸塩鉱物を含有する樹脂組成物を用いて形成された比較例２～４の成形品よりも、レーザー光透過率が向上した。この成形品は、波長８００ｎｍ～１０００ｎｍのレーザー光透過率が、２３％以上と高く、レーザー溶着の際の透過側成形品の製造に有用である。 As is apparent from Tables 1 and 2, the molded articles formed using the resin compositions of Examples 1 to 4 were those of Comparative Example 1 formed using a resin composition containing no layered silicate mineral. The laser light transmittance was improved as compared with the molded products of Comparative Examples 2 to 4 formed using a molded product and a resin composition containing a layered silicate mineral having a particle size outside the predetermined range. This molded article has a laser light transmittance of a wavelength of 800 nm to 1000 nm as high as 23% or more, and is useful for producing a transmission side molded article at the time of laser welding.
１　　光源
２　　レーザー光
３　　透過側成形品
４　　吸収側成形品 1 Light source 2 Laser light 3 Transmission side molded product 4 Absorption side molded product

Claims (11)

  1. 　ポリブチレンテレフタレート系樹脂と、平均一次粒子径が１．０μｍ以上５．０μｍ以下の層状ケイ酸塩鉱物を含むレーザー光透過性向上剤とを含有する、レーザー溶着用ポリブチレンテレフタレート系樹脂組成物。 A polybutylene terephthalate resin composition for laser welding, comprising: a polybutylene terephthalate resin; and a laser light transmission improver containing a layered silicate mineral having an average primary particle size of 1.0 μm to 5.0 μm.
  2. 　レーザー光透過性向上剤の含有量が、ポリブチレンテレフタレート系樹脂１００質量部に対して０．０１質量部以上２０質量部以下である、請求項１に記載のレーザー溶着用ポリブチレンテレフタレート系樹脂組成物。 The polybutylene terephthalate resin composition for laser welding according to claim 1, wherein the content of the laser light transmission improver is 0.01 parts by mass or more and 20 parts by mass or less with respect to 100 parts by mass of the polybutylene terephthalate resin. object.
  3. 　層状ケイ酸塩鉱物が、タルクを含む、請求項１又は２に記載のレーザー溶着用ポリブチレンテレフタレート系樹脂組成物。 The polybutylene terephthalate resin composition for laser welding according to claim 1 or 2, wherein the layered silicate mineral contains talc.
  4. 　さらに無機充填剤を含有する、請求項１から３のいずれか一項に記載のレーザー溶着用ポリブチレンテレフタレート系樹脂組成物。 The polybutylene terephthalate resin composition for laser welding according to any one of claims 1 to 3, further comprising an inorganic filler.
  5. 　レーザー光透過側成形品用の樹脂組成物である、請求項１から４のいずれか一項に記載のレーザー溶着用ポリブチレンテレフタレート系樹脂組成物。 The laser-welded polybutylene terephthalate resin composition according to any one of claims 1 to 4, which is a resin composition for a laser light transmission side molded article.
  6. 　請求項１から５のいずれか一項に記載のポリブチレンテレフタレート系樹脂組成物を含む、レーザー溶着用成形品。 A laser welded molded article comprising the polybutylene terephthalate resin composition according to any one of claims 1 to 5.
  7. 　光路長１．５ｍｍにおける波長８００ｎｍ～１０００ｎｍのレーザー光透過率が、レーザー光透過性向上剤を含有しないポリブチレンテレフタレート系樹脂組成物を用いた成形品よりも高い、請求項６に記載の成形品。 The molded article according to claim 6, wherein the laser light transmittance at a wavelength of 800 nm to 1000 nm at an optical path length of 1.5 mm is higher than that of a molded article using a polybutylene terephthalate resin composition not containing a laser light transmission improver. .
  8. 　請求項１から５のいずれか一項に記載のポリブチレンテレフタレート系樹脂組成物を含む第１の成形品と、熱可塑性樹脂組成物を含む第２の成形品とが、レーザー溶着された複合成形品。 A composite molding in which a first molded product containing the polybutylene terephthalate resin composition according to any one of claims 1 to 5 and a second molded product containing a thermoplastic resin composition are laser-welded. Goods.
  9. 　熱可塑性樹脂組成物が、レーザー光透過性向上剤を含有しないポリブチレンテレフタレート系樹脂組成物である、請求項８に記載の複合成形品。 The composite molded article according to claim 8, wherein the thermoplastic resin composition is a polybutylene terephthalate resin composition that does not contain a laser light transmission improver.
  10. 　請求項１から５のいずれか一項に記載のポリブチレンテレフタレート系樹脂組成物を含む第１の成形品の少なくとも一部と、熱可塑性樹脂組成物を含む第２の成形品の少なくとも一部とを重ね合せ、第１の成形品側からレーザー光を照射して第１の成形品の少なくとも一部と第２の成形品の少なくとも一部とを溶着する、複合成形品の製造方法。 At least a part of a first molded article containing the polybutylene terephthalate resin composition according to any one of claims 1 to 5, and at least a part of a second molded article containing a thermoplastic resin composition; And at least a part of the first molded product and at least a part of the second molded product are welded by irradiating a laser beam from the first molded product side.
  11. 　ポリブチレンテレフタレート系樹脂組成物に、平均一次粒子径が１．０μｍ以上５．０μｍ以下の層状ケイ酸塩鉱物を配合する、ポリブチレンテレフタレート系樹脂組成物のレーザー光透過性向上方法。 A method for improving the laser light transmittance of a polybutylene terephthalate resin composition, comprising blending a polybutylene terephthalate resin composition with a layered silicate mineral having an average primary particle size of 1.0 μm or more and 5.0 μm or less.
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