Polybutylene Terephthalate Composition

Abstract

Disclosed is a polybutylene terephthalate composition comprising polybutylene terephthalate (PBT), an amorphous polymer having a refractive index of at least 1.55 and free of carbonate groups, an alkali metal carbonate or bicarbonate, optionally glass fibers, and optionally additives, which exhibits significantly enhanced LT compared to polybutylene terephthalate compositions without such carbonate and / or bicarbonate while maintaining a balance of other properties.

Description

[Technical field]

[0001] The present invention relates to a polybutylene terephthalate composition. [Background technology]

[0002] In the automotive industry, sensors, electronic control units (ECUs) etc. are usually built into housings preferably made of polybutylene terephthalate (PBT) due to its good mechanical properties and dimensional stability.

[0003] Laser welding is a joining process with cost-effective characteristics that replaces traditional techniques that require screws and adhesives. The joining process is based on the conversion of radiant energy into heat through its absorption in the material, resulting in local melting in the joining area. The basic requirement for laser welding is that the top layer should have good laser transmittance for high welding speeds.

[0004] Compared to other semi-crystalline engineering polymers, PBT has poor transmittance for typical lasers with a wavelength of 1064 nm. Most of the radiation that does not penetrate is reflected and / or scattered. As a result, the process window for laser welding is quite narrow and the welding speed is limited. For high speed welding, i.e. short manufacturing cycle times, there is a demand for PBT with high infrared transmittance.

[0005] In order to increase the laser transmittance of the PBT composition, an attempt has been made to blend PBT with an amorphous polymer. JP2010-070626A discloses a polyester resin composition having excellent laser transmittance, which comprises (A) 29-84 mass% PBT (A), 5-60 mass% of a component (B) selected from a polyester in which repeating units formed from terephthalic acid and 1,4-cyclohexanedimethanol account for 25 mol% or more, 10-50 mass% of reinforcing fiber (C), and 1-20 mass% of a block copolymer of polyalkyl methacrylate and butyl acrylate (D). However, the compatibility between the polyester resin and the amorphous resin is insufficient, and the laser transmittance needs to be improved.

[0006] Thermoplastic elastomer or epoxy resin is used to improve the compatibility between PBT and amorphous resin and further improve the laser transmittance.

[0007] CN1863870A discloses a PBT resin composition for laser welding, which can be uniformly welded to achieve high weld strength. The laser-weldable resin composition includes 100 parts by weight of PBT (A), 1-50 parts by weight of an elastomer (B), such as a thermoplastic polystyrene elastomer or a thermoplastic polyester elastomer, 5-100 parts by weight of a polycarbonate resin (C), 1-10 parts by weight of a plasticizer (D), and 0-100 parts by weight of a filler or reinforcement (E), such as glass fiber. The resin composition results in a molded article with low variation in light transmittance from part to part. Thus, the molded article can be uniformly laser welded to a mating material. However, the laser transmittance is not obviously increased.

[0008] WO2021 / 013115A discloses a polyester resin composition containing PBT, an amorphous resin, and an epoxy resin selected from triphenolmethane type, tetraphenolethane type, novolac type and naphthalene type epoxy resins, and additives. However, in WO2021 / 013115A, in order to achieve a high laser transmittance at 1 mm (about 1.5 times that at 2 mm), a high loading of amorphous resin is required (Example 5), and therefore, under such circumstances, their heat distortion temperature (HDT) and chemical resistance performance are inevitably reduced. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] JP 2010-070626 A [Patent Document 2] China Patent Publication No. 1863870 [Patent Document 3] International Publication No. 2021 / 013115 Summary of the Invention [Problem to be solved by the invention]

[0010] There is always a need to increase the laser transmittance of a PBT composition as much as possible, while at the very least its overall performance should remain constant. [Means for solving the problem]

[0011] Summary of the Invention The inventors have surprisingly found that by combining the base resin PBT with specially selected amorphous polymers such as PS, PETG, etc., and more particularly by combining with alkali metal carbonates and / or bicarbonates, the laser transmittance of the PBT composition can be significantly increased while maintaining a balanced set of other properties compared to polybutylene terephthalate compositions without such alkali metal carbonates and / or bicarbonates.

[0012] According to the present invention, (A) polybutylene terephthalate resin, (B) an amorphous polymer having a refractive index of at least 1.55 and having no carbonate group in the repeat unit of the amorphous polymer; (C) alkali metal carbonates and / or bicarbonates; (D) optionally, glass fibers; and (E) Optional Additives A PBT composition is provided comprising:

[0013] The present invention also provides an article made from the polybutylene terephthalate compositions described herein, the article being laser weldable, and preferably being a sensor, an electronic control unit, or an advanced driver assistance system (ADAS) device for an automobile.

[0014] The present invention also provides the use of an alkali metal carbonate and / or bicarbonate in improving the laser transmittance of a polybutylene terephthalate composition.

[0015] Detailed Description of the Invention The present invention is described in detail below. It should be understood that the present invention can be embodied in many different ways and should not be construed as being limited to the embodiments set forth within this application.

[0016] Except in the actual examples or where otherwise expressly indicated, all numbers herein expressing quantities of ingredients or reaction conditions, physical properties of ingredients, and / or uses can be understood to be optionally modified by the word "about."

[0017] Unless otherwise stated, all amounts are by weight of the final composition.

[0018] It should be noted that in specifying a range of values, a given upper value may be associated with an optional lower value.

[0019] For the avoidance of doubt, the term "comprising" is intended to mean "including" but not necessarily "consisting of" or "consisting of," in other words the listed steps or options need not be exhaustive.

[0020] Singular forms include plural referents unless the context clearly dictates otherwise. Terms such as "comprise", "comprising", and the like are used interchangeably with "contain", "containing", and the like and are to be interpreted in an open, non-limiting manner, i.e., additional components or elements may be present. "Consisting of" or "consisting essentially of" or the like may encompass "comprising" or the like.

[0021] The terms "polybutylene terephthalate" and "polybutylene terephthalate composition" within this application may also be abbreviated to "PBT" and "PBT composition," respectively.

[0022] According to the present invention, (A) polybutylene terephthalate resin, (B) an amorphous polymer having a refractive index of at least 1.55 and having no carbonate group in the repeat unit of the amorphous polymer; (C) alkali metal carbonates and / or bicarbonates; (D) optionally, glass fibers; and (E) Optional Additives A PBT composition is provided comprising:

[0023] According to the present invention, the term "carbonate group" as used herein is represented by the formula OC(O)OR, where R can be hydrogen, alkyl, alkenyl, alkynyl, aryl, aralkyl, cycloalkyl, halogenated alkyl, or heterocycloalkyl group.

[0024] The polybutylene terephthalate composition according to the present invention contains a polybutylene terephthalate resin (A). The polybutylene terephthalate (PBT) resin according to the present invention [CAS number 24968-12-5] is produced from terephthalic acid or its reactive derivatives and butanediol by known methods, for example, the methods described in Kunststoff-Handbuch, Vol. VIII, p. 695 et seq., Karl Hanser Verlag, Munich 1973.

[0025] Polybutylene terephthalate is known as a crystalline or semi-crystalline thermoplastic polymeric material derived from the polycondensation of, for example, 1,4-butanediol with terephthalic acid via esterification or via transesterification with an ester of terephthalic acid.

[0026] There is no particular limitation on the PBT resin useful in the polybutylene terephthalate composition according to the present invention. The polybutylene terephthalate resin includes homopolyesters or copolyesters of polybutylene terephthalate (polybutylene terephthalate, polybutylene terephthalate copolyester). There is no limitation on the type of copolyester, and includes, for example, block copolymers, random copolymers, graft copolymers and alternating copolymers. The polybutylene terephthalate resin contains butylene terephthalate as the main component, and it is obtained by conventional methods, for example, by polycondensation of polymerization monomers including a first dicarboxylic acid component including at least one terephthalic acid and / or its ester derivative, and a first glycol component including at least one 1,4-butanediol and / or its ester derivative. The 1,4-butanediol can be in the form of renewable or recycled raw materials. Any known polybutylene terephthalate resin can be used in the present invention, and the present invention is not limited to the crystallization characteristics, the type or amount of the end group of the polybutylene terephthalate, the intrinsic viscosity, the molecular weight, the linear or branched chain structure, the type or amount of the polymerization catalyst, and the polymerization method.

[0027] The PBT resin may contain units derived from other monomers other than terephthalic acid, its ester derivatives, and 1,4-butanediol or its ester derivatives, within the range that does not impair the properties. For example, the amount of the other monomers is preferably 40 mol % or less, particularly 20 mol % or less, based on the total monomers constituting the polybutylene terephthalate resin.

[0028] Examples of other monomers include aliphatic dicarboxylic acids having up to 20 carbon atoms, alicyclic dicarboxylic acids having 7 to 12 carbon atoms, aromatic dicarboxylic acids having 8 to 16 carbon atoms, and their respective ester-forming derivatives, preferably succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, sebacic acid, azelaic acid, undecanedicarboxylic acid, dodecanedicarboxylic acid, tridecanediacid, tetradecanediacid, pentadecanediacid, hexadecanedicarboxylic acid, dimer acid, isophthalic acid, phthalic acid, 2,6-naphthalenedicarboxylic acid, hexahydrophthalic acid, hexahydroisophthalic acid, hexahydroterephthalic acid, 1,2-cyclopentanedicarboxylic acid, 1,3-cyclopentanedicarboxylic acid, humic acid (himic acid), and the like. The monomers are selected from the group consisting of 4,4'-diphenyldicarboxylic acid, 4,4'-diphenyletherdicarboxylic acid, 4,4'-diphenylmethanedicarboxylic acid and 4,4'-diphenylketonedicarboxylic acid, more preferably succinic acid, glutaric acid, adipic acid, pimelic acid, isophthalic acid, phthalic acid or their ester-forming derivatives. These other monomers may be used alone or in mixtures of two or more of them. Succinic acid, azelaic acid and sebacic acid have the further advantage of being available in the form of renewable raw materials.

[0029] Examples of the other monomers include aliphatic glycols having 2 to 12 carbon atoms, alicyclic glycols having 5 to 12 carbon atoms, polyoxyalkylene glycols having a plurality of oxyalkylene units having 2 to 4 carbon atoms, and / or aromatic glycols having 6 to 14 carbon atoms, preferably selected from the group consisting of ethylene glycol, propylene glycol, 1,3-butylene glycol, trimethylene glycol, 1,6-hexanediol, neopentanediol, 1,3-octanediol, diethylene glycol, triethylene glycol, dipropylene glycol, tripropylene glycol, ditetramethylene glycol, decanediol, 1,4-cyclohexanediol, 1,4-cyclohexanedimethanol, bis-1,4-(hydroxymethyl)cyclohexane, diethylene glycol, polytetramethylene glycol, bisphenol, xylylene glycol, and naphthalenediol, more preferably ethylene glycol and / or diethylene glycol. These other monomers may be used alone or in a mixture of two or more of them. 1,3-butylene glycol has the additional advantage of being available in the form of renewable raw materials.

[0030] Examples of PBT resins include polybutylene terephthalate, polybutylene (terephthalate / isophthalate), polybutylene (terephthalate / adipate), polybutylene (terephthalate / sebacate), polybutylene (terephthalate / decanedicarboxylate), polybutylene (terephthalate / naphthalate), and poly(butylene / ethylene) terephthalate.

[0031] The viscosity number of PBT resin is 90 to 170 cm, measured in a 0.005 g / ml phenol / 1,2-dichlorobenzene solution (1:1 mass ratio) according to ISO 1628-5. 3 / g, preferably 100 to 135 cm 3 / g, more preferably 100 to 120 cm 3 / g range is suitable.

[0032] The PBT may have a weight average molecular weight (Mw) of 60,000 to 100,000 as measured by gel permeation chromatography (GPC).

[0033] Any PBT resin produced through known methods, or any commercially available PBT material suitable as an engineering plastic, can be used for the purpose of the present invention. Examples of commercially available PBT materials include, but are not limited to, Ultradur® series (BASF), BLUESTAR® series (Bluestar), Crastin® series (DuPont), Pocan® series (Lanxess), NOVADURAN® series (Mitsubishi), LNP® LUBRICOMP® series and VALOX® series (SABIC), RAMSTER® series (Polyram), and Toraycon® series (Toray).

[0034] PBT resins derived from bio-based sources can be used in the present invention. Recycled PBT resins can also be used in the present invention.

[0035] It should be understood that when referred to within this application, the amount of PBT is intended to refer to the amount of PBT itself. Commercially available PBT materials often already have certain additives intentionally added to them to provide one or more desired properties, such as color, strength, stability, etc., but these additives are not counted in the amount of PBT.

[0036] The PBT resin (A) is preferably present in the PBT composition according to the present invention in an amount of 10% by mass to 90% by mass, preferably 20% by mass to 80% by mass, more preferably 40% by mass to 80% by mass, for example 35% by mass, 40% by mass, 45% by mass, 50% by mass, 55% by mass, 60% by mass, 65% by mass, 70% by mass, 75% by mass, 80% by mass, relative to the total mass of the PBT composition.

[0037] The amorphous polymer (B) used in the present invention relates to a polymer having a refractive index of at least 1.55 and having no carbonate group in the repeating unit of the amorphous polymer. The refractive index is specified in accordance with ASTM D542 at 25°C and a wavelength of 589 nm. The amorphous polymer (B) preferably has a refractive index of 1.55 to 1.6.

[0038] According to the present invention, the term "carbonate group" as used herein is represented by the formula OC(O)OR, where R can be hydrogen, alkyl, alkenyl, alkynyl, aryl, aralkyl, cycloalkyl, halogenated alkyl, or heterocycloalkyl group. An example of an amorphous polymer having carbonate groups is polycarbonate.

[0039] An amorphous polymer in the present invention refers to a polymer that has no or essentially no crystalline domains between the polymer chains, as evidenced, for example, by the absence of a melting peak measurable by differential scanning calorimetry (DSC) or the presence of a melting peak with a melting enthalpy of less than 5 J / g, the melting enthalpy being expressed relative to the mass of the polymer.

[0040] Examples of the amorphous polymer (B) having a refractive index of at least 1.55 and no carbonate group in the repeating unit are selected from the group consisting of polystyrene (PS), styrene-acrylonitrile copolymer (SAN), amorphous copolyester, and the like.

[0041] The polystyrene comprises from 50 mol % to 100 mol %, preferably from 60 mol % to 99.5 mol %, most preferably from 70 mol % to 99.5 mol %, based on the total units of the polystyrene, of units derived from at least one monomer having formula I, [ka] In the above formula, R1 is the same or different and is hydrogen, C1 to C 10-Alkyl group, C1-C6-alkenyl group, C4-C 10 -Alicyclic group, C6~C 12 - selected from the group consisting of aromatic hydrocarbon groups, C1-C4 alkoxy groups and halogen atoms, preferably hydrogen, C1-C 10 -alkyl groups and / or halogen atoms, more preferably hydrogen and / or C1-C4-alkyl groups, most preferably hydrogen, methyl and / or ethyl groups; R2 is hydrogen and / or C1-C4-alkyl groups, preferably hydrogen, methyl and / or ethyl groups.

[0042] Examples of formula I are styrene, α-methylstyrene, 2-methylstyrene, 3-methylstyrene, 4-methylstyrene, 2,4-dimethylstyrene, 2,5-dimethylstyrene, para-α-dimethylstyrene, 2-ethylstyrene, 3-ethylstyrene, 4-ethylstyrene, 2-isopropylstyrene, 3-isopropylstyrene, 4-isopropylstyrene, ortho-divinylbenzene, meta-divinylbenzene, para-divinylbenzene, ethoxystyrene, chlorostyrene, bromostyrene, dibromostyrene, dichlorostyrene, tribromostyrene, trichlorostyrene, 2-vinylnaphthalene and 2-isopropenylnaphthalene, preferably styrene, α-methylstyrene, 4-methylstyrene, chlorostyrene, para-divinylbenzene, bromostyrene, dibromostyrene, trichlorostyrene, 2-vinylnaphthalene and / or 2-isopropenylnaphthalene, more preferably styrene, α-methylstyrene and / or 4-methylstyrene.

[0043] As the most widely used type of polystyrene, homopolystyrene is commercially available from numerous manufacturers or suppliers around the world, among which BASF SE, Shell chemicals, Dow Chemicals, and Sinopec are on the list of major suppliers.

[0044] Generally, the molecular weight of the polystyrene can range from 50,000 to 300,000 daltons, preferably from 100,000 to 200,000 daltons, as measured by GPC.

[0045] The styrene-acrylonitrile copolymers according to the present invention relate to copolymers derived from vinyl aromatic monomers and vinyl cyanide monomers.

[0046] 100 parts by weight of styrene-acrylonitrile copolymer per total parts by weight of the monomers of the styrene-acrylonitrile copolymer (B.1) 50 to 99 parts by weight of vinyl aromatic monomer and / or ring-substituted vinyl aromatic monomer, and (B.2) 1 to 50 parts by mass of vinyl cyanide monomer It is preferred that the formula (I) includes:

[0047] Preferred compounds (B.1) are selected from the group consisting of styrene, α-methylstyrene, p-methylstyrene and p-chloro-styrene. Preferred vinyl cyanide monomers are unsaturated nitriles, in particular acrylonitrile or methacrylonitrile.

[0048] The styrene-acrylonitrile copolymers may also contain (B.3): C1-C8-alkyl methacrylates, in particular methyl methacrylate, ethyl methacrylate, n-butyl acrylate, t-butyl acrylate, or derivatives of unsaturated carboxylic acids. Preferred derivatives of unsaturated carboxylic acids are the anhydrides or their imides, in particular maleic anhydride or n-phenylmaleimide.

[0049] Very particularly preferred monomers for the styrene-acrylonitrile copolymer are styrene and acrylonitrile. Particularly preferred is the styrene-acrylonitrile copolymer known as SAN and having the CAS number 9003-54-7, which is commercially available, for example from Styrolution GmbH, Frankfurt am Main.

[0050] Also suitable as amorphous polymers according to the invention are styrene-acrylonitrile copolymers and / or α-methylstyrene-acrylonitrile copolymers which contain methyl acrylate, ethyl acrylate or n-butyl acrylate as further comonomers.

[0051] Examples of styrene-acrylonitrile copolymers are styrene / acrylonitrile copolymer (SAN copolymer), α-methylstyrene / acrylonitrile copolymer (AMSAN copolymer), styrene acrylonitrile-maleic anhydride copolymer, styrene-acrylonitrile-phenylmaleimide copolymer, α-methylstyrene-acrylonitrile-methyl methacrylate copolymer, α-methylstyrene-acrylonitrile-t-butyl methacrylate copolymer, and styrene-acrylonitrile-t-butyl methacrylate copolymer.

[0052] The SAN copolymers and α-methylstyrene-acrylonitrile copolymers (AMSAN) used according to the invention as amorphous polymers generally contain 18 to 35% by weight, preferably 20 to 32% by weight and particularly preferably 22 to 30% by weight of acrylonitrile (AN) and 82 to 65% by weight, preferably 80 to 68% by weight and particularly preferably 78 to 70% by weight of styrene (S) or α-methylstyrene (AMS), where the sum of styrene or α-methylstyrene and acrylonitrile is 100% by weight.

[0053] Suitable SAN copolymers are commercially available from Styrolution under the trademark Luran®. SAN copolymers having an S / AN ratio (in weight percent) of 82 / 18 to 67 / 33 and an MVR (measured according to ISO 1133 at 220° C. and 10 kg load) of at least 10 ml / 10 min are preferred, such as Luran 368. SAN copolymers having an S / AN ratio (in weight percent) of 81 / 19 to 65 / 35 and an MVR (measured according to ISO 1133 at 220° C. and 10 kg load) of at least 8 ml / 10 min are also preferred, such as Luran M60, Luran VLL1970, Luran 25100, Luran VLP and Luran VLR. Among the abovementioned SAN copolymers, those having an MVR of at least 10 ml / 10 min are particularly preferred.

[0054] The styrene-acrylonitrile copolymers used according to the present invention generally have an average molecular weight Mw of 150,000 to 350,000, preferably 150,000 to 300,000, more preferably 150,000 to 250,000, and most preferably 150,000 to 200,000, as measured by gel permeation chromatography (GPC).

[0055] The amorphous polymer according to the present invention relates to a copolyester having at least two different repeat units (RP1 and RP2) in a total amount of at least 55 mol %, preferably at least 80 mol %, more preferably at least 90 mol %, based on the total repeat units of the copolyester. The repeat unit RP1 is derived from a glycol and a dicarboxylic acid, the dicarboxylic acid comprising terephthalic acid and optionally other dicarboxylic acids. The repeat unit RP2 is derived from a glycol and a dicarboxylic acid. The molar ratio of glycol in RP1 to glycol in RP2 is preferably 2:8 to 8:2.

[0056] The glycols in RP1 or RP2 may be aliphatic glycols having 2 to 12 carbon atoms, respectively, and / or cycloaliphatic glycols having 4 to 12 carbon atoms. The aliphatic glycols having 2 to 12 carbon atoms are preferably selected from the group consisting of ethylene glycol, propylene glycol, 1,3-butylene glycol, trimethylene glycol, 1,6-hexanediol, neopentanediol, neopentyl glycol, 1,3-octanediol, diethylene glycol, triethylene glycol, dipropylene glycol, tripropylene glycol, ditetramethylene glycol and decanediol, more preferably ethylene glycol, diethylene glycol and / or neopentyl glycol. The alicyclic glycol having 4 to 12 carbon atoms is preferably selected from the group consisting of 1,2-cyclobutanediol, 1,3-cyclobutanediol, 1,4-cyclohexanediol, 1,4-cyclohexanedimethanol and bis-1,4-(hydroxymethyl)cyclohexane, more preferably 1,4-cyclohexanediol and / or 1,4-cyclohexanedimethanol. These other monomers may be used alone or in combination of two or more of them.

[0057] The other dicarboxylic acid in RP1 or the dicarboxylic acid in RP2 may be an aliphatic dicarboxylic acid having 2 to 20 carbon atoms, an alicyclic dicarboxylic acid having 7 to 12 carbon atoms, and / or an aromatic dicarboxylic acid. The aliphatic dicarboxylic acid having 2 to 20 carbon atoms is preferably selected from succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, sebacic acid, azelaic acid, undecanedicarboxylic acid, dodecanedicarboxylic acid, tridecanedioic acid, tetradecanedioic acid, pentadecanedicarboxylic acid and hexadecanedicarboxylic acid, more preferably succinic acid, glutaric acid, adipic acid and pimelic acid. The alicyclic dicarboxylic acid having 7 to 12 carbon atoms is preferably selected from the group consisting of 1,2-cyclohexanedicarboxylic acid, 1,3-cyclohexanedicarboxylic acid, 1,4-cyclohexanedicarboxylic acid, 1,2-cyclopentanedicarboxylic acid and 1,3-cyclopentanedicarboxylic acid. The aromatic dicarboxylic acid is preferably selected from the group consisting of terephthalic acid, isophthalic acid and phthalic acid. The other dicarboxylic acids are excluding terephthalic acid. These other monomers may be used alone or in combination of two or more of them.

[0058] The glycol in RP1 is preferably an aliphatic glycol having 2 to 12 carbon atoms, more preferably ethylene glycol, diethylene glycol and / or neopentyl glycol, and the glycol in RP2 is preferably an alicyclic glycol having 6 to 12 carbon atoms, preferably 1,4-cyclohexanediol and / or 1,4-cyclohexanedimethanol. The dicarboxylic acid in RP1 and RP2 is preferably terephthalic acid.

[0059] In one embodiment of the present invention, RP1 is derived from ethylene glycol and terephthalic acid, and RP2 is derived from 1,4-cyclohexanedimethanol and terephthalic acid. The molar ratio of ethylene glycol to 1,4-cyclohexanedimethanol is preferably 8:2 to 7:3. This amorphous copolyester is also called PETG (cyclohexanedimethylene modified poly(ethylene terephthalate)).

[0060] In another embodiment of the present invention, RP1 is derived from ethylene glycol and terephthalic acid, and RP2 is derived from 1,4-cyclohexanedimethanol and terephthalic acid. The molar ratio of ethylene glycol to 1,4-cyclohexanedimethanol is preferably 2:8 to 3:7. This amorphous copolyester is also called PCTG (ethylene modified poly(1,4-cyclohexanedimethylene terephthalate)).

[0061] In another embodiment of the present invention, the amorphous copolyester is PETG, PCTG or a mixture thereof.

[0062] PETG and PCTG are commercially available from suppliers such as Eastman, SK Chemical, etc. For example, PETG S2008 from SK chemical, PETG 6763 from Eastman, PCTG 5445 may be suitably employed in the present application.

[0063] The amorphous polymer (B) is preferably present in the PBT composition according to the present invention in an amount of 1% by mass to 50% by mass, preferably 5% by mass to 40% by mass, more preferably 5% by mass to 35% by mass, for example 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40% by mass, based on the total mass of the PBT composition.

[0064] The alkali metal carbonate or bicarbonate (C) according to the present invention is a carbonate anion moiety (CO 2- ) or the bicarbonate anion portion (HCO3 2-) and a cationic moiety of an alkali metal(s), the latter being selected from lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), francium (Fr). For the cationic moiety, sodium and potassium are preferred, with sodium being most preferred. The alkali metal carbonate or bicarbonate is preferably selected from the group consisting of sodium carbonate, sodium bicarbonate, potassium carbonate, potassium bicarbonate.

[0065] The alkali metal carbonate or bicarbonate (C) is preferably present in the PBT composition according to the invention in an amount of 0.01% to 10% by weight, preferably 0.01% to 5% by weight, more preferably 0.01% to 2% by weight, most preferably 0.05% to 0.5% by weight, for example 0.1%, 0.15%, 0.2%, 0.3%, 0.4%, 0.5%, 0.8% by weight, relative to the total weight of the PBT composition.

[0066] The PBT composition according to the present invention may further comprise glass fibers (D) as a reinforcing material. Glass fibers are materials made from extremely fine glass fibers of non-crystalline material. Due to the various sources of raw glass, the basic composition of glass fibers may differ from each other.

[0067] The glass fibers may be selected from the group consisting of E-glass fibers, A-glass fibers, D-glass fibers, AR-glass fibers, C-glass fibers and S-glass fibers, more preferably E-glass fibers and / or D-glass fibers, most preferably E-glass fibers. The cross section of the glass fibers may be circular or non-circular, for example rectangular, elliptical, cocoon-shaped, preferably circular.

[0068] E-glass fiber (E-GF) is derived from E-glass, which is composed primarily of oxides of calcium, aluminum, and silicon. According to ASTM D578, the detailed components of E-glass fiber are, based on the total mass of the glass fiber, 0-10 mass% B2O3, 16-30 mass% CaO and MgO, 12-16 mass% Al2O3, 52-62 mass% SiO2, 0-2 mass% total alkali metal oxides, 0-1.5 mass% TiO2, 0.05-0.8 mass% Fe2O3, and 0-1 mass% fluorides; preferably 5-10 mass% B2O3, 16-25 mass% CaO, 12-16 mass% Al2O3, 52-56 mass% SiO2, 0-5 mass% MgO, 0-2 mass% Na2O and K2O, 0-0.8 mass% TiO2, 0.05-0.4 mass% Fe2O3, and 0-1 mass% fluorides.

[0069] D-glass fiber (D-GF) is derived from borosilicate glass and is named for its low dielectric constant and is composed mainly of 21-24% by weight of B2O3, 0-1% by weight of CaO, 0-1% by weight of Al2O3, 72-75% by weight of SiO2, 0-4% by weight of Na2O and K2O, and 0-0.3% by weight of Fe2O3, based on the total weight of the glass fiber.

[0070] The fiber length and fiber diameter of the glass fiber are not particularly limited. The fiber length is preferably 1 to 10 mm, and more preferably 2 to 6 mm. The fiber diameter is preferably 3 to 20 μm, and more preferably 7 to 13 μm. Examples of the cross-sectional shape of the fibrous reinforcing agent include circular, rectangular, elliptical, cocoon-shaped, or other non-circular cross sections, and are preferably circular. The glass fiber in the PBT composition is preferably 200 to 450 μm, more preferably 220 to 350 μm, and most preferably 220 to 300 μm long.

[0071] The glass fiber is preferably surface-treated with a silane coupling agent, such as a vinyl silane coupling agent, an acrylic silane coupling agent, an epoxy silane coupling agent, and an amino silane coupling agent, and preferably an amino silane coupling agent. The silane coupling agent can be dispersed in a sizing agent. Examples of the sizing agent are an acrylic compound, an acrylic / maleic acid derivative modified compound, an epoxy compound, a urethane compound, a urethane / maleic acid derivative modified compound, and a urethane / amine modified compound.

[0072] The glass fiber (D) is preferably present in the PBT composition in an amount of 0 mass% to 50 mass%, preferably 10 mass% to 40 mass%, more preferably 20 mass% to 35 mass%, for example 5 mass%, 10 mass%, 15 mass%, 20 mass%, 25 mass%, 30 mass%, 35 mass%, 40 mass%, relative to the total mass of the PBT composition.

[0073] The PBT composition according to the invention may further comprise one or more additives (E), such as release agents, impact modifiers, heat stabilizers, compatibilizers, stabilizers, lubricants, toughening agents, antioxidants, light stabilizers, plasticizers, colorants, such as dyes and / or pigments, surfactants, nucleating agents, coupling agents, antimicrobial agents, antistatic agents, etc. The additives may be used in conventional amounts. For example, the PBT composition may comprise one or more additives in an amount of 0.01 to 15% by weight, based on the total weight of the PBT composition.

[0074] The PBT composition may, for example, include a lubricant or processing aid. Suitable lubricants or processing aids are preferably esters or amides of saturated aliphatic carboxylic acids having 10 to 40 carbon atoms, and / or saturated aliphatic alcohols or amines having 2 to 40 carbon atoms. The lubricant is preferably a pentaerythritol ester of a fatty acid having 10 to 20 carbon atoms, more preferably pentaerythritol tetrastearate.

[0075] When present, the lubricant may be in an amount of 0.01 to 3 wt %, or about 0.01 to 2 wt %, or about 0.2 to 1 wt %, based on the total weight of the PBT composition.

[0076] The PBT composition may, for example, include an antioxidant. Suitable antioxidants are aromatic amine antioxidants, hindered phenolic antioxidants and phosphite antioxidants, especially hindered phenolic antioxidants. Examples of the hindered phenol antioxidants are α-[3-[3,5-bis(1,1-dimethylethyl)-4-hydroxyphenyl]-1-oxopropyl]-ω-[3-[3,5-bis(1,1-dimethylethyl)-4-hydroxyphenyl]-1-oxopropoxy]poly(oxy-1,2-ethanediyl), 2,4-bis[(octylthio)methyl]-o-cresol, octyl-3,5-di-tert-butyl-4-hydroxy-hydrocinnamate, 3,5-bis(1,1-dimethylethyl)-4-hydroxybenzenepropanoic acid C7-C9-branched alkyl ester, 2,4-bis[(dodecylthio)methyl]-o-cresol, 4,4'-butylidenebis-(3-methyl-6-tert-butylfuran), phenol), 3,5-bis(1,1-dimethylethyl)-4-hydroxybenzenepropanoic acid octadecyl ester, pentaerythritol tetrakis(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate), triethylene glycol bis[3-(3-tert-butyl-5-methyl-4-hydrophenyl)propionate], 2,4-bis(n-octylthio)-6-(4-hydroxy-3,5-di-tert-butylanilino)-1,3,5-triazine, tris-(3,5-di-tert-butyl-4-hydroxybenzyl)isocyanurate, 2,2-thiodiethylene bis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate].

[0077] When present, the antioxidant may be in an amount of 0-2 wt. %, or about 0.01-1 wt. %, or about 0.2-0.8 wt. %, based on the total weight of the PBT composition.

[0078] The PBT composition may, for example, include an adhesion promoter. Suitable adhesion promoters may be epoxides, such as epoxidized alkyl esters of fatty acids, such as epoxidized linseed oil, epoxidized soybean oil, and epoxidized rapeseed oil, and epoxy resins, such as bisphenol-A resin.

[0079] When present, the adhesion promoter may be in an amount of 0 to 2 wt %, or about 0.01 to 1 wt %, or about 0.2 to 0.8 wt %, based on the total weight of the PBT composition.

[0080] In a particular embodiment according to the invention, the PBT composition comprises, relative to the total weight of the PBT composition: (A) 10 to 90 mass% of a polybutylene terephthalate resin, (B) 1 to 50% by mass of an amorphous polymer having a refractive index of at least 1.55, preferably 1.55 to 1.6, and having no carbonate group in the repeating unit of the amorphous polymer; (C) 0.01 to 10 mass % of an alkali metal carbonate and / or bicarbonate, (D) 0 to 50% by weight of glass fibers, and (E) 0 to 15% by mass of additives Includes.

[0081] In a preferred embodiment 2, the PBT composition comprises, based on the total mass of the PBT composition: (A) 20 to 80 mass % of a polybutylene terephthalate resin, (B) 1 to 50% by mass of an amorphous polymer having a refractive index of at least 1.55, preferably 1.55 to 1.6, and having no carbonate group in the repeating unit of the amorphous polymer; (C) 0.01 to 10 mass % of an alkali metal carbonate and / or bicarbonate, (D) 0 to 50% by weight of glass fibers, preferably E-glass fibers, and (E) 0 to 15% by mass of additives Includes.

[0082] In another preferred embodiment 3, the PBT composition comprises, based on the total weight of the PBT composition: (A) 20 to 80 mass % of a polybutylene terephthalate resin, (B) 5 to 40% by mass of an amorphous polymer having a refractive index of at least 1.55, preferably 1.55 to 1.6, and having no carbonate group in the repeating unit of the amorphous polymer; (C) 0.01 to 10 mass % of an alkali metal carbonate and / or bicarbonate, (D) 0 to 50% by weight of glass fibers, preferably E-glass fibers, and (E) 0 to 15% by mass of additives Includes.

[0083] In another preferred embodiment 4, the PBT composition comprises, based on the total weight of the PBT composition: (A) 40 to 80 mass% of a polybutylene terephthalate resin, (B) 5 to 40% by mass of an amorphous polymer having a refractive index of at least 1.55, preferably 1.55 to 1.6, and having no carbonate group in the repeating unit of the amorphous polymer; (C) 0.01 to 10 mass % of an alkali metal carbonate and / or bicarbonate, (D) 0 to 50% by weight of glass fibers, preferably E-glass fibers, and (E) 0 to 15% by mass of additives Includes.

[0084] In another preferred embodiment 5, the PBT composition comprises, based on the total weight of the PBT composition: (A) 20 to 80 mass % of a polybutylene terephthalate resin, (B) 5 to 35% by mass of an amorphous polymer having a refractive index of at least 1.55, preferably 1.55 to 1.6, and having no carbonate group in the repeating unit of the amorphous polymer; (C) 0.01 to 10 mass % of an alkali metal carbonate and / or bicarbonate, (D) 0 to 50% by weight of glass fibers, preferably E-glass fibers, and (E) 0 to 15% by mass of additives Includes.

[0085] In another preferred embodiment 6, the PBT composition comprises, based on the total weight of the PBT composition: (A) 40 to 80 mass% of a polybutylene terephthalate resin, (B) 5 to 35% by mass of an amorphous polymer having a refractive index of at least 1.55, preferably 1.55 to 1.6, and having no carbonate group in the repeating unit of the amorphous polymer; (C) 0.01 to 10 mass % of an alkali metal carbonate and / or bicarbonate, (D) 0 to 50% by weight of glass fibers, preferably E-glass fibers, and (E) 0 to 15% by mass of additives Includes.

[0086] In another preferred embodiment 7, the PBT composition comprises, based on the total weight of the PBT composition: (A) 40 to 80 mass% of a polybutylene terephthalate resin, (B) 1 to 50% by mass of an amorphous polymer having a refractive index of at least 1.55, preferably 1.55 to 1.6, and having no carbonate group in the repeating unit of the amorphous polymer; (C) 0.01 to 5 mass % of an alkali metal carbonate and / or bicarbonate, (D) 0 to 50% by weight of glass fibers, preferably E-glass fibers, and (E) 0 to 15% by mass of additives Includes.

[0087] In another preferred embodiment 8, the PBT composition comprises, based on the total weight of the PBT composition: (A) 20 to 80 mass % of a polybutylene terephthalate resin, (B) 5 to 40% by mass of an amorphous polymer having a refractive index of at least 1.55, preferably 1.55 to 1.6, and having no carbonate group in the repeating unit of the amorphous polymer; (C) 0.01 to 5 mass % of an alkali metal carbonate and / or bicarbonate, (D) 0 to 50% by weight of glass fibers, preferably E-glass fibers, and (E) 0 to 15% by mass of additives Includes.

[0088] In another preferred embodiment 9, the PBT composition comprises, based on the total weight of the PBT composition: (A) 40 to 80 mass% of a polybutylene terephthalate resin, (B) 5 to 40% by mass of an amorphous polymer having a refractive index of at least 1.55, preferably 1.55 to 1.6, and having no carbonate group in the repeating unit of the amorphous polymer; (C) 0.01 to 5 mass % of an alkali metal carbonate and / or bicarbonate, (D) 0 to 50% by weight of glass fibers, preferably E-glass fibers, and (E) 0 to 15% by mass of additives Includes.

[0089] In another preferred embodiment 10, the PBT composition comprises, based on the total weight of the PBT composition: (A) 20 to 80 mass % of a polybutylene terephthalate resin, (B) 5 to 35% by mass of an amorphous polymer having a refractive index of at least 1.55, preferably 1.55 to 1.6, and having no carbonate group in the repeating unit of the amorphous polymer; (C) 0.01 to 5 mass % of an alkali metal carbonate and / or bicarbonate, (D) 0 to 50% by weight of glass fibers, preferably E-glass fibers, and (E) 0 to 15% by mass of additives Includes.

[0090] In another preferred embodiment 11, the PBT composition comprises, based on the total weight of the PBT composition: (A) 40 to 80 mass% of a polybutylene terephthalate resin, (B) 5 to 35% by mass of an amorphous polymer having a refractive index of at least 1.55, preferably 1.55 to 1.6, and having no carbonate group in the repeating unit of the amorphous polymer; (C) 0.01 to 5 mass % of an alkali metal carbonate and / or bicarbonate, (D) 0 to 50% by weight of glass fibers, preferably E-glass fibers, and (E) 0 to 15% by mass of additives Includes.

[0091] In another preferred embodiment 12, the PBT composition comprises, based on the total weight of the PBT composition: (A) 20 to 80 mass % of a polybutylene terephthalate resin, (B) 5 to 40% by mass of an amorphous polymer having a refractive index of at least 1.55, preferably 1.55 to 1.6, and having no carbonate group in the repeating unit of the amorphous polymer; (C) 0.01 to 2 mass % of an alkali metal carbonate and / or bicarbonate, (D) 0 to 50% by weight of glass fibers, preferably E-glass fibers, and (E) 0 to 15% by mass of additives Includes.

[0092] In another preferred embodiment 13, the PBT composition comprises, based on the total weight of the PBT composition: (A) 40 to 80 mass% of a polybutylene terephthalate resin, (B) 5 to 40% by mass of an amorphous polymer having a refractive index of at least 1.55, preferably 1.55 to 1.6, and having no carbonate group in the repeating unit of the amorphous polymer; (C) 0.01 to 2 mass % of an alkali metal carbonate and / or bicarbonate, (D) 0 to 50% by weight of glass fibers, preferably E-glass fibers, and (E) 0 to 15% by mass of additives Includes.

[0093] In another preferred embodiment 14, the PBT composition comprises, based on the total weight of the PBT composition: (A) 40 to 80 mass% of a polybutylene terephthalate resin, (B) 5 to 35% by mass of an amorphous polymer having a refractive index of at least 1.55, preferably 1.55 to 1.6, and having no carbonate group in the repeating unit of the amorphous polymer; (C) 0.01 to 2 mass % of an alkali metal carbonate and / or bicarbonate, (D) 0 to 50% by weight of glass fibers, preferably E-glass fibers, and (E) 0 to 15% by mass of additives Includes.

[0094] In another preferred embodiment 15, the PBT composition comprises, based on the total weight of the PBT composition: (A) 20 to 80 mass % of a polybutylene terephthalate resin, (B) 5 to 40% by mass of an amorphous polymer having a refractive index of at least 1.55, preferably 1.55 to 1.6, and having no carbonate group in the repeating unit of the amorphous polymer; (C) 0.05 to 0.5 mass % of an alkali metal carbonate and / or bicarbonate, (D) 0 to 50% by weight of glass fibers, preferably E-glass fibers, and (E) 0 to 15% by mass of additives Includes.

[0095] In another preferred embodiment 16, the PBT composition comprises, based on the total weight of the PBT composition: (A) 40 to 80 mass% of a polybutylene terephthalate resin, (B) 5 to 40% by mass of an amorphous polymer having a refractive index of at least 1.55, preferably 1.55 to 1.6, and having no carbonate group in the repeating unit of the amorphous polymer; (C) 0.05 to 0.5 mass % of an alkali metal carbonate and / or bicarbonate, (D) 0 to 50% by weight of glass fibers, preferably E-glass fibers, and (E) 0 to 15% by mass of additives Includes.

[0096] In another preferred embodiment 17, the PBT composition comprises, based on the total weight of the PBT composition: (A) 20 to 80 mass % of a polybutylene terephthalate resin, (B) 5 to 35% by mass of an amorphous polymer having a refractive index of at least 1.55, preferably 1.55 to 1.6, and having no carbonate group in the repeating unit of the amorphous polymer; (C) 0.05 to 0.5 mass % of an alkali metal carbonate and / or bicarbonate, (D) 0 to 50% by weight of glass fibers, preferably E-glass fibers, and (E) 0 to 15% by mass of additives Includes.

[0097] In another preferred embodiment 18, the PBT composition comprises, based on the total weight of the PBT composition: (A) 40 to 80 mass% of a polybutylene terephthalate resin, (B) 5 to 35% by mass of an amorphous polymer having a refractive index of at least 1.55, preferably 1.55 to 1.6, and having no carbonate group in the repeating unit of the amorphous polymer; (C) 0.05 to 0.5 mass % of an alkali metal carbonate and / or bicarbonate, (D) 0 to 50% by weight of glass fibers, preferably E-glass fibers, and (E) 0 to 15% by mass of additives Includes.

[0098] In another preferred embodiment 19, the PBT composition comprises, based on the total weight of the PBT composition: (A) 10 to 90 mass% of a polybutylene terephthalate resin, (B) 1 to 50% by mass of an amorphous polymer having a refractive index of at least 1.55, preferably 1.55 to 1.6, and having no carbonate group in the repeating unit of the amorphous polymer; (C) 0.01 to 10 mass % of an alkali metal carbonate and / or bicarbonate, (D) 10 to 40% by weight of glass fibers, preferably E-glass fibers, and (E) 0 to 15% by mass of additives Includes.

[0099] In another preferred embodiment 20, the PBT composition comprises, based on the total weight of the PBT composition: (A) 10 to 90 mass% of a polybutylene terephthalate resin, (B) 5 to 40% by mass of an amorphous polymer having a refractive index of at least 1.55, preferably 1.55 to 1.6, and having no carbonate group in the repeating unit of the amorphous polymer; (C) 0.01 to 10 mass % of an alkali metal carbonate and / or bicarbonate, (D) 10 to 40% by weight of glass fibers, preferably E-glass fibers, and (E) 0 to 15% by mass of additives Includes.

[0100] In another preferred embodiment 21, the PBT composition comprises, based on the total weight of the PBT composition: (A) 20 to 80 mass % of a polybutylene terephthalate resin, (B) 5 to 40% by mass of an amorphous polymer having a refractive index of at least 1.55, preferably 1.55 to 1.6, and having no carbonate group in the repeating unit of the amorphous polymer; (C) 0.01 to 10 mass % of an alkali metal carbonate and / or bicarbonate, (D) 10 to 40% by weight of glass fibers, preferably E-glass fibers, and (E) 0 to 15% by mass of additives Includes.

[0101] In another preferred embodiment 22, the PBT composition comprises, based on the total weight of the PBT composition: (A) 40 to 80 mass% of a polybutylene terephthalate resin, (B) 5 to 40% by mass of an amorphous polymer having a refractive index of at least 1.55, preferably 1.55 to 1.6, and having no carbonate group in the repeating unit of the amorphous polymer; (C) 0.01 to 10 mass % of an alkali metal carbonate and / or bicarbonate, (D) 10 to 40% by weight of glass fibers, preferably E-glass fibers, and (E) 0 to 15% by mass of additives Includes.

[0102] In another preferred embodiment 23, the PBT composition comprises, based on the total weight of the PBT composition: (A) 20 to 80 mass % of a polybutylene terephthalate resin, (B) 5 to 40% by mass of an amorphous polymer having a refractive index of at least 1.55, preferably 1.55 to 1.6, and having no carbonate group in the repeating unit of the amorphous polymer; (C) 0.01 to 5 mass % of an alkali metal carbonate and / or bicarbonate, (D) 10 to 40% by weight of glass fibers, preferably E-glass fibers, and (E) 0 to 15% by mass of additives Includes.

[0103] In another preferred embodiment 24, the PBT composition comprises, based on the total weight of the PBT composition: (A) 40 to 80 mass% of a polybutylene terephthalate resin, (B) 5 to 40% by mass of an amorphous polymer having a refractive index of at least 1.55, preferably 1.55 to 1.6, and having no carbonate group in the repeating unit of the amorphous polymer; (C) 0.01 to 5 mass % of an alkali metal carbonate and / or bicarbonate, (D) 10 to 40% by weight of glass fibers, preferably E-glass fibers, and (E) 0 to 15% by mass of additives Includes.

[0104] In another preferred embodiment 25, the PBT composition comprises, based on the total weight of the PBT composition: (A) 20 to 80 mass % of a polybutylene terephthalate resin, (B) 5 to 35% by mass of an amorphous polymer having a refractive index of at least 1.55, preferably 1.55 to 1.6, and having no carbonate group in the repeating unit of the amorphous polymer; (C) 0.01 to 5 mass % of an alkali metal carbonate and / or bicarbonate, (D) 10 to 40% by weight of glass fibers, preferably E-glass fibers, and (E) 0 to 15% by mass of additives Includes.

[0105] In another preferred embodiment 26, the PBT composition comprises, based on the total weight of the PBT composition: (A) 40 to 80 mass% of a polybutylene terephthalate resin, (B) 5 to 35% by mass of an amorphous polymer having a refractive index of at least 1.55, preferably 1.55 to 1.6, and having no carbonate group in the repeating unit of the amorphous polymer; (C) 0.01 to 5 mass % of an alkali metal carbonate and / or bicarbonate, (D) 10 to 40% by weight of glass fibers, preferably E-glass fibers, and (E) 0 to 15% by mass of additives Includes.

[0106] In another preferred embodiment 27, the PBT composition comprises, based on the total weight of the PBT composition: (A) 20 to 80 mass % of a polybutylene terephthalate resin, (B) 5 to 40% by mass of an amorphous polymer having a refractive index of at least 1.55, preferably 1.55 to 1.6, and having no carbonate group in the repeating unit of the amorphous polymer; (C) 0.01 to 2 mass % of an alkali metal carbonate and / or bicarbonate, (D) 10 to 40% by weight of glass fibers, preferably E-glass fibers, and (E) 0 to 15% by mass of additives Includes.

[0107] In another preferred embodiment 28, the PBT composition comprises, based on the total weight of the PBT composition: (A) 40 to 80 mass% of a polybutylene terephthalate resin, (B) 5 to 40% by mass of an amorphous polymer having a refractive index of at least 1.55, preferably 1.55 to 1.6, and having no carbonate group in the repeating unit of the amorphous polymer; (C) 0.01 to 2 mass % of an alkali metal carbonate and / or bicarbonate, (D) 10 to 40% by weight of glass fibers, preferably E-glass fibers, and (E) 0 to 15% by mass of additives Includes.

[0108] In another preferred embodiment 29, the PBT composition comprises, based on the total weight of the PBT composition: (A) 20 to 80 mass % of a polybutylene terephthalate resin, (B) 5 to 35% by mass of an amorphous polymer having a refractive index of at least 1.55, preferably 1.55 to 1.6, and having no carbonate group in the repeating unit of the amorphous polymer; (C) 0.01 to 2 mass % of an alkali metal carbonate and / or bicarbonate, (D) 10 to 40% by weight of glass fibers, preferably E-glass fibers, and (E) 0 to 15% by mass of additives Includes.

[0109] In another preferred embodiment 30, the PBT composition comprises, based on the total weight of the PBT composition: (A) 40 to 80 mass% of a polybutylene terephthalate resin, (B) 5 to 35% by mass of an amorphous polymer having a refractive index of at least 1.55, preferably 1.55 to 1.6, and having no carbonate group in the repeating unit of the amorphous polymer; (C) 0.01 to 2 mass % of an alkali metal carbonate and / or bicarbonate, (D) 10 to 40% by weight of glass fibers, preferably E-glass fibers, and (E) 0 to 15% by mass of additives Includes.

[0110] In another preferred embodiment 31, the PBT composition comprises, based on the total weight of the PBT composition: (A) 40 to 80 mass% of a polybutylene terephthalate resin, (B) 5 to 40% by mass of an amorphous polymer having a refractive index of at least 1.55, preferably 1.55 to 1.6, and having no carbonate group in the repeating unit of the amorphous polymer; (C) 0.05 to 0.5 mass % of an alkali metal carbonate and / or bicarbonate, (D) 10 to 40% by weight of glass fibers, preferably E-glass fibers, and (E) 0 to 15% by mass of additives Includes.

[0111] In another preferred embodiment 32, the PBT composition comprises, based on the total weight of the PBT composition: (A) 40 to 80 mass% of a polybutylene terephthalate resin, (B) 5 to 35% by mass of an amorphous polymer having a refractive index of at least 1.55, preferably 1.55 to 1.6, and having no carbonate group in the repeating unit of the amorphous polymer; (C) 0.05 to 0.5 mass % of an alkali metal carbonate and / or bicarbonate, (D) 10 to 40% by weight of glass fibers, preferably E-glass fibers, and (E) 0 to 15% by mass of additives Includes.

[0112] In another preferred embodiment 33, the PBT composition comprises, based on the total weight of the PBT composition: (A) 10 to 90 mass% of a polybutylene terephthalate resin, (B) 1 to 50% by mass of an amorphous polymer having a refractive index of at least 1.55, preferably 1.55 to 1.6, and having no carbonate group in the repeating unit of the amorphous polymer; (C) 0.01 to 10 mass % of an alkali metal carbonate and / or bicarbonate, (D) 20 to 35% by weight of glass fibers, preferably E-glass fibers, and (E) 0.01 to 15 mass% of additives Includes.

[0113] In another preferred embodiment 34, the PBT composition comprises, based on the total weight of the PBT composition: (A) 40 to 80 mass% of a polybutylene terephthalate resin, (B) 5 to 40% by mass of an amorphous polymer having a refractive index of at least 1.55, preferably 1.55 to 1.6, and having no carbonate group in the repeating unit of the amorphous polymer; (C) 0.01 to 10 mass % of an alkali metal carbonate and / or bicarbonate, (D) 20 to 35% by weight of glass fibers, preferably E-glass fibers, and (E) 0.01 to 15 mass% of additives Includes.

[0114] In another preferred embodiment 35, the PBT composition comprises, based on the total weight of the PBT composition: (A) 20 to 80 mass % of a polybutylene terephthalate resin, (B) 5 to 35% by mass of an amorphous polymer having a refractive index of at least 1.55, preferably 1.55 to 1.6, and having no carbonate group in the repeating unit of the amorphous polymer; (C) 0.01 to 10 mass % of an alkali metal carbonate and / or bicarbonate, (D) 20 to 35% by weight of glass fibers, preferably E-glass fibers, and (E) 0.01 to 15 mass% of additives Includes.

[0115] In another preferred embodiment, the PBT composition comprises, based on the total weight of the PBT composition: (A) 40 to 80 mass% of a polybutylene terephthalate resin, (B) 5 to 35% by mass of an amorphous polymer having a refractive index of at least 1.55, preferably 1.55 to 1.6, and having no carbonate group in the repeating unit of the amorphous polymer; (C) 0.01 to 10 mass % of an alkali metal carbonate and / or bicarbonate, (D) 20 to 35% by weight of glass fibers, preferably E-glass fibers, and (E) 0.01 to 15 mass% of additives Includes.

[0116] In another preferred embodiment 37, the PBT composition comprises, based on the total weight of the PBT composition: (A) 40 to 80 mass% of a polybutylene terephthalate resin, (B) 5 to 40% by mass of an amorphous polymer having a refractive index of at least 1.55, preferably 1.55 to 1.6, and having no carbonate group in the repeating unit of the amorphous polymer; (C) 0.01 to 5 mass % of an alkali metal carbonate and / or bicarbonate, (D) 20 to 35% by weight of glass fibers, preferably E-glass fibers, and (E) 0.01 to 15 mass% of additives Includes.

[0117] In another preferred embodiment, the PBT composition comprises, based on the total weight of the PBT composition: (A) 40 to 80 mass% of a polybutylene terephthalate resin, (B) 5 to 35% by mass of an amorphous polymer having a refractive index of at least 1.55, preferably 1.55 to 1.6, and having no carbonate group in the repeating unit of the amorphous polymer; (C) 0.01 to 5 mass % of an alkali metal carbonate and / or bicarbonate, (D) 20 to 35% by weight of glass fibers, preferably E-glass fibers, and (E) 0.01 to 15 mass% of additives Includes.

[0118] In another preferred embodiment, the PBT composition comprises, based on the total weight of the PBT composition: (A) 40 to 80 mass% of a polybutylene terephthalate resin, (B) 5 to 40% by mass of an amorphous polymer having a refractive index of at least 1.55, preferably 1.55 to 1.6, and having no carbonate group in the repeating unit of the amorphous polymer; (C) 0.01 to 2 mass % of an alkali metal carbonate and / or bicarbonate, (D) 20 to 35% by weight of glass fibers, preferably E-glass fibers, and (E) 0.01 to 15 mass% of additives Includes.

[0119] In another preferred embodiment 40, the PBT composition comprises, based on the total weight of the PBT composition: (A) 20 to 80 mass % of a polybutylene terephthalate resin, (B) 5 to 35% by mass of an amorphous polymer having a refractive index of at least 1.55, preferably 1.55 to 1.6, and having no carbonate group in the repeating unit of the amorphous polymer; (C) 0.01 to 2 mass % of an alkali metal carbonate and / or bicarbonate, (D) 20 to 35% by weight of glass fibers, preferably E-glass fibers, and (E) 0.01 to 15 mass% of additives Includes.

[0120] In another preferred embodiment 41, the PBT composition comprises, based on the total weight of the PBT composition: (A) 40 to 80 mass% of a polybutylene terephthalate resin, (B) 5 to 35% by mass of an amorphous polymer having a refractive index of at least 1.55, preferably 1.55 to 1.6, and having no carbonate group in the repeating unit of the amorphous polymer; (C) 0.01 to 2 mass % of an alkali metal carbonate and / or bicarbonate, (D) 20 to 35% by weight of glass fibers, preferably E-glass fibers, and (E) 0.01 to 15 mass% of additives Includes.

[0121] In another preferred embodiment 42, the PBT composition comprises, based on the total weight of the PBT composition: (A) 20 to 80 mass % of a polybutylene terephthalate resin, (B) 5 to 40% by mass of an amorphous polymer having a refractive index of at least 1.55, preferably 1.55 to 1.6, and having no carbonate group in the repeating unit of the amorphous polymer; (C) 0.05 to 0.5 mass % of an alkali metal carbonate and / or bicarbonate, (D) 20 to 35% by weight of glass fibers, preferably E-glass fibers, and (E) 0.01 to 15 mass% of additives Includes.

[0122] In another preferred embodiment 43, the PBT composition comprises, based on the total weight of the PBT composition: (A) 20 to 80 mass % of a polybutylene terephthalate resin, (B) 5 to 35% by mass of an amorphous polymer having a refractive index of at least 1.55, preferably 1.55 to 1.6, and having no carbonate group in the repeating unit of the amorphous polymer; (C) 0.05 to 0.5 mass % of an alkali metal carbonate and / or bicarbonate, (D) 20 to 35% by weight of glass fibers, preferably E-glass fibers, and (E) 0.01 to 15 mass% of additives Includes.

[0123] In another preferred embodiment 44, the PBT composition comprises, based on the total weight of the PBT composition: (A) 40 to 80 mass% of a polybutylene terephthalate resin, (B) 5 to 35% by mass of an amorphous polymer having a refractive index of at least 1.55, preferably 1.55 to 1.6, and having no carbonate group in the repeating unit of the amorphous polymer; (C) 0.05 to 0.5 mass % of an alkali metal carbonate and / or bicarbonate, (D) 20 to 35% by weight of glass fibers, preferably E-glass fibers, and (E) 0.01 to 15 mass% of additives Includes.

[0124] In another preferred embodiment 45, the PBT composition comprises, based on the total weight of the PBT composition: (A) 10 to 90 mass% of a polybutylene terephthalate resin, (B) 1 to 50% by mass of an amorphous polymer selected from the group consisting of polystyrene, styrene-acrylonitrile copolymer, amorphous copolyester, and mixtures thereof; (C) 0.01 to 10 mass % of an alkali metal carbonate and / or bicarbonate, (D) 0 to 50% by weight of glass fibers, preferably E-glass fibers, and (E) 0 to 15% by mass of additives Includes.

[0125] In another preferred embodiment 46, the PBT composition comprises, based on the total weight of the PBT composition: (A) 40 to 80 mass% of a polybutylene terephthalate resin, (B) 5 to 40% by mass of an amorphous polymer selected from the group consisting of polystyrene, styrene-acrylonitrile copolymer, amorphous copolyester, and mixtures thereof; (C) 0.01 to 10 mass % of an alkali metal carbonate and / or bicarbonate, (D) 0 to 50% by weight of glass fibers, preferably E-glass fibers, and (E) 0 to 15% by mass of additives Includes.

[0126] In another preferred embodiment 47, the PBT composition comprises, based on the total weight of the PBT composition: (A) 40 to 80 mass% of a polybutylene terephthalate resin, (B) 5 to 35% by mass of an amorphous polymer selected from the group consisting of polystyrene, styrene-acrylonitrile copolymer, amorphous copolyester, and mixtures thereof; (C) 0.01 to 10 mass % of an alkali metal carbonate and / or bicarbonate, (D) 0 to 50% by weight of glass fibers, preferably E-glass fibers, and (E) 0 to 15% by mass of additives Includes.

[0127] In another preferred embodiment 48, the PBT composition comprises, based on the total weight of the PBT composition: (A) 40 to 80 mass% of a polybutylene terephthalate resin, (B) 5 to 40% by mass of an amorphous polymer selected from the group consisting of polystyrene, styrene-acrylonitrile copolymer, amorphous copolyester, and mixtures thereof; (C) 0.01 to 5 mass % of an alkali metal carbonate and / or bicarbonate, (D) 0 to 50% by weight of glass fibers, preferably E-glass fibers, and (E) 0 to 15% by mass of additives Includes.

[0128] In another preferred embodiment 49, the PBT composition comprises, based on the total weight of the PBT composition: (A) 40 to 80 mass% of a polybutylene terephthalate resin, (B) 5 to 35% by mass of an amorphous polymer selected from the group consisting of polystyrene, styrene-acrylonitrile copolymer, amorphous copolyester, and mixtures thereof; (C) 0.01 to 5 mass % of an alkali metal carbonate and / or bicarbonate, (D) 0 to 50% by weight of glass fibers, preferably E-glass fibers, and (E) 0 to 15% by mass of additives Includes.

[0129] In another preferred embodiment 50, the PBT composition comprises, based on the total weight of the PBT composition: (A) 40 to 80 mass% of a polybutylene terephthalate resin, (B) 5 to 40% by mass of an amorphous polymer selected from the group consisting of polystyrene, styrene-acrylonitrile copolymer, amorphous copolyester, and mixtures thereof; (C) 0.01 to 2 mass % or 0.05 to 0.5 mass % of an alkali metal carbonate and / or bicarbonate, (D) 0 to 50% by weight of glass fibers, preferably E-glass fibers, and (E) 0 to 15% by mass of additives Includes.

[0130] In another preferred embodiment 51, the PBT composition comprises, based on the total weight of the PBT composition: (A) 40 to 80 mass% of a polybutylene terephthalate resin, (B) 1 to 50% by mass of an amorphous polymer selected from the group consisting of polystyrene, styrene-acrylonitrile copolymer, amorphous copolyester, and mixtures thereof; (C) 0.01 to 10 mass % of an alkali metal carbonate and / or bicarbonate, (D) 10 to 40% by weight of glass fibers, preferably E-glass fibers, and (E) 0.01 to 15 mass% of additives Includes.

[0131] In another preferred embodiment 52, the PBT composition comprises, based on the total weight of the PBT composition: (A) 40 to 80 mass% of a polybutylene terephthalate resin, (B) 5 to 40% by mass of an amorphous polymer selected from the group consisting of polystyrene, styrene-acrylonitrile copolymer, amorphous copolyester, and mixtures thereof; (C) 0.01 to 10 mass % of an alkali metal carbonate and / or bicarbonate, (D) 10 to 40% by weight of glass fibers, preferably E-glass fibers, and (E) 0.01 to 15 mass% of additives Includes.

[0132] In another preferred embodiment 53, the PBT composition comprises, based on the total weight of the PBT composition: (A) 40 to 80 mass% of a polybutylene terephthalate resin, (B) 5 to 40% by mass of an amorphous polymer selected from the group consisting of polystyrene, styrene-acrylonitrile copolymer, amorphous copolyester, and mixtures thereof; (C) 0.01 to 5 mass % of an alkali metal carbonate and / or bicarbonate, (D) 10 to 40% by weight of glass fibers, preferably E-glass fibers, and (E) 0.01 to 15 mass% of additives Includes.

[0133] In another preferred embodiment 54, the PBT composition comprises, based on the total weight of the PBT composition: (A) 40 to 80 mass% of a polybutylene terephthalate resin, (B) 5 to 35% by mass of an amorphous polymer selected from the group consisting of polystyrene, styrene-acrylonitrile copolymer, amorphous copolyester, and mixtures thereof; (C) 0.01 to 5 mass % of an alkali metal carbonate and / or bicarbonate, (D) 10 to 40% by weight of glass fibers, preferably E-glass fibers, and (E) 0.01 to 15 mass% of additives Includes.

[0134] In another preferred embodiment 55, the PBT composition comprises, based on the total weight of the PBT composition: (A) 40 to 80 mass% of a polybutylene terephthalate resin, (B) 5 to 40% by mass of an amorphous polymer selected from the group consisting of polystyrene, styrene-acrylonitrile copolymer, amorphous copolyester, and mixtures thereof; (C) 0.01 to 2 mass % or 0.05 to 0.5 mass % of an alkali metal carbonate and / or bicarbonate, (D) 10 to 40% by weight of glass fibers, preferably E-glass fibers, and (E) 0.01 to 15 mass% of additives Includes.

[0135] In another preferred embodiment 56, the PBT composition comprises, based on the total weight of the PBT composition: (A) 40 to 80 mass% of a polybutylene terephthalate resin, (B) 5 to 35% by mass of an amorphous polymer selected from the group consisting of polystyrene, styrene-acrylonitrile copolymer, amorphous copolyester, and mixtures thereof; (C) 0.01 to 2 mass % or 0.05 to 0.5 mass % of an alkali metal carbonate and / or bicarbonate, (D) 10 to 40% by weight of glass fibers, preferably E-glass fibers, and (E) 0.01 to 15 mass% of additives Includes.

[0136] In another preferred embodiment 57, the PBT composition comprises, based on the total weight of the PBT composition: (A) 40 to 80 mass% of a polybutylene terephthalate resin, (B) 5 to 40% by mass of an amorphous polymer selected from the group consisting of polystyrene, styrene-acrylonitrile copolymer, amorphous copolyester, and mixtures thereof, wherein the polystyrene is styrene, α-methylstyrene, 2-methylstyrene, 3-methylstyrene, 4-methylstyrene, 2,4-dimethylstyrene, 2,5-dimethylstyrene, para-α-dimethylstyrene, 2-ethylstyrene, 3-ethylstyrene, 4-ethylstyrene, 2-isopropylstyrene, 3-isopropylstyrene, 4-isopropylstyrene, ortho-divinylbenzene, meta-divinylbenzene, para-divinylbenzene, ethoxystyrene, chlorostyrene, bromostyrene, dibromostyrene, dichlorostyrene, tribromostyrene, trichlorostyrene, 2-vinylnaphthalene, and 2-isopropenyl naphthalene, wherein the styrene-acrylonitrile copolymer is selected from the group consisting of styrene / acrylonitrile copolymer, α-methylstyrene / acrylonitrile copolymer, styrene acrylonitrile-maleic anhydride copolymer, styrene-acrylonitrile-phenylmaleimide copolymer, α-methylstyrene-acrylonitrile-methyl methacrylate copolymer, α-methylstyrene-acrylonitrile-t-butyl methacrylate copolymer, and styrene-acrylonitrile-t-butyl methacrylate copolymer, and the amorphous copolyester is cyclohexanedimethylene modified poly(ethylene terephthalate), ethylene modified poly(1,4-cyclohexanedimethylene terephthalate), or a mixture thereof, (C) 0.01 to 5 mass % of an alkali metal carbonate and / or bicarbonate, (D) 0 to 50% by weight of glass fibers, preferably E-glass fibers, and (E) 0 to 15% by mass of additives Includes.

[0137] In another preferred embodiment 58, the PBT composition comprises, based on the total weight of the PBT composition: (A) 40 to 80 mass% of a polybutylene terephthalate resin, (B) 5 to 35% by mass of an amorphous polymer selected from the group consisting of polystyrene, styrene-acrylonitrile copolymer, amorphous copolyester, and mixtures thereof, wherein the polystyrene is styrene, α-methylstyrene, 2-methylstyrene, 3-methylstyrene, 4-methylstyrene, 2,4-dimethylstyrene, 2,5-dimethylstyrene, para-α-dimethylstyrene, 2-ethylstyrene, 3-ethylstyrene, 4-ethylstyrene, 2-isopropylstyrene, 3-isopropylstyrene, 4-isopropylstyrene, ortho-divinylbenzene, meta-divinylbenzene, para-divinylbenzene, ethoxystyrene, chlorostyrene, bromostyrene, dibromostyrene, dichlorostyrene, tribromostyrene, trichlorostyrene, 2-vinylnaphthalene, and 2-isopropenyl naphthalene, wherein the styrene-acrylonitrile copolymer is selected from the group consisting of styrene / acrylonitrile copolymer, α-methylstyrene / acrylonitrile copolymer, styrene acrylonitrile-maleic anhydride copolymer, styrene-acrylonitrile-phenylmaleimide copolymer, α-methylstyrene-acrylonitrile-methyl methacrylate copolymer, α-methylstyrene-acrylonitrile-t-butyl methacrylate copolymer, and styrene-acrylonitrile-t-butyl methacrylate copolymer, and the amorphous copolyester is cyclohexanedimethylene modified poly(ethylene terephthalate), ethylene modified poly(1,4-cyclohexanedimethylene terephthalate), or a mixture thereof, (C) 0.01 to 5 mass % of an alkali metal carbonate and / or bicarbonate, (D) 0 to 50% by weight of glass fibers, preferably E-glass fibers, and (E) 0 to 15% by mass of additives Includes.

[0138] In another preferred embodiment 59, the PBT composition comprises, based on the total weight of the PBT composition: (A) 40 to 80 mass% of a polybutylene terephthalate resin, (B) 5 to 40% by mass of an amorphous polymer selected from the group consisting of polystyrene, styrene-acrylonitrile copolymer, amorphous copolyester, and mixtures thereof, wherein the polystyrene is styrene, α-methylstyrene, 2-methylstyrene, 3-methylstyrene, 4-methylstyrene, 2,4-dimethylstyrene, 2,5-dimethylstyrene, para-α-dimethylstyrene, 2-ethylstyrene, 3-ethylstyrene, 4-ethylstyrene, 2-isopropylstyrene, 3-isopropylstyrene, 4-isopropylstyrene, ortho-divinylbenzene, meta-divinylbenzene, para-divinylbenzene, ethoxystyrene, chlorostyrene, bromostyrene, dibromostyrene, dichlorostyrene, tribromostyrene, trichlorostyrene, 2-vinylnaphthalene, and 2-isopropenyl naphthalene, wherein the styrene-acrylonitrile copolymer is selected from the group consisting of styrene / acrylonitrile copolymer, α-methylstyrene / acrylonitrile copolymer, styrene acrylonitrile-maleic anhydride copolymer, styrene-acrylonitrile-phenylmaleimide copolymer, α-methylstyrene-acrylonitrile-methyl methacrylate copolymer, α-methylstyrene-acrylonitrile-t-butyl methacrylate copolymer, and styrene-acrylonitrile-t-butyl methacrylate copolymer, and the amorphous copolyester is cyclohexanedimethylene modified poly(ethylene terephthalate), ethylene modified poly(1,4-cyclohexanedimethylene terephthalate), or a mixture thereof, (C) 0.01 to 2 mass % or 0.05 to 0.5 mass % of an alkali metal carbonate and / or bicarbonate, (D) 0 to 50% by weight of glass fibers, preferably E-glass fibers, and (E) 0 to 15% by mass of additives Includes.

[0139] In another preferred embodiment 60, the PBT composition comprises, based on the total weight of the PBT composition: (A) 40 to 80 mass% of a polybutylene terephthalate resin, (B) 5 to 40% by mass of an amorphous polymer selected from the group consisting of polystyrene, styrene-acrylonitrile copolymer, amorphous copolyester, and mixtures thereof, wherein the polystyrene is styrene, α-methylstyrene, 2-methylstyrene, 3-methylstyrene, 4-methylstyrene, 2,4-dimethylstyrene, 2,5-dimethylstyrene, para-α-dimethylstyrene, 2-ethylstyrene, 3-ethylstyrene, 4-ethylstyrene, 2-isopropylstyrene, 3-isopropylstyrene, 4-isopropylstyrene, ortho-divinylbenzene, meta-divinylbenzene, para-divinylbenzene, ethoxystyrene, chlorostyrene, bromostyrene, dibromostyrene, dichlorostyrene, tribromostyrene, trichlorostyrene, 2-vinylnaphthalene, and 2-isopropenyl naphthalene, wherein the styrene-acrylonitrile copolymer is selected from the group consisting of styrene / acrylonitrile copolymer, α-methylstyrene / acrylonitrile copolymer, styrene acrylonitrile-maleic anhydride copolymer, styrene-acrylonitrile-phenylmaleimide copolymer, α-methylstyrene-acrylonitrile-methyl methacrylate copolymer, α-methylstyrene-acrylonitrile-t-butyl methacrylate copolymer, and styrene-acrylonitrile-t-butyl methacrylate copolymer, and the amorphous copolyester is cyclohexanedimethylene modified poly(ethylene terephthalate), ethylene modified poly(1,4-cyclohexanedimethylene terephthalate), or a mixture thereof, (C) 0.01 to 5 mass % of an alkali metal carbonate and / or bicarbonate, (D) 10 to 40% by weight of glass fibers, preferably E-glass fibers, and (E) 0.01 to 15 mass% of additives Includes.

[0140] In another preferred embodiment 61, the PBT composition comprises, based on the total weight of the PBT composition: (A) 40 to 80 mass% of a polybutylene terephthalate resin, (B) 5 to 35% by mass of an amorphous polymer selected from the group consisting of polystyrene, styrene-acrylonitrile copolymer, amorphous copolyester, and mixtures thereof, wherein the polystyrene is styrene, α-methylstyrene, 2-methylstyrene, 3-methylstyrene, 4-methylstyrene, 2,4-dimethylstyrene, 2,5-dimethylstyrene, para-α-dimethylstyrene, 2-ethylstyrene, 3-ethylstyrene, 4-ethylstyrene, 2-isopropylstyrene, 3-isopropylstyrene, 4-isopropylstyrene, ortho-divinylbenzene, meta-divinylbenzene, para-divinylbenzene, ethoxystyrene, chlorostyrene, bromostyrene, dibromostyrene, dichlorostyrene, tribromostyrene, trichlorostyrene, 2-vinylnaphthalene, and 2-isopropenyl naphthalene, wherein the styrene-acrylonitrile copolymer is selected from the group consisting of styrene / acrylonitrile copolymer, α-methylstyrene / acrylonitrile copolymer, styrene acrylonitrile-maleic anhydride copolymer, styrene-acrylonitrile-phenylmaleimide copolymer, α-methylstyrene-acrylonitrile-methyl methacrylate copolymer, α-methylstyrene-acrylonitrile-t-butyl methacrylate copolymer, and styrene-acrylonitrile-t-butyl methacrylate copolymer, and the amorphous copolyester is cyclohexanedimethylene modified poly(ethylene terephthalate), ethylene modified poly(1,4-cyclohexanedimethylene terephthalate), or a mixture thereof, (C) 0.01 to 5 mass % of an alkali metal carbonate and / or bicarbonate, (D) 10 to 40% by weight of glass fibers, preferably E-glass fibers, and (E) 0.01 to 15 mass% of additives Includes.

[0141] In another preferred embodiment 62, the PBT composition comprises, based on the total weight of the PBT composition: (A) 20 to 80 mass % of a polybutylene terephthalate resin, (B) 5 to 40% by mass of an amorphous polymer selected from the group consisting of polystyrene, styrene-acrylonitrile copolymer, amorphous copolyester, and mixtures thereof, wherein the polystyrene is styrene, α-methylstyrene, 2-methylstyrene, 3-methylstyrene, 4-methylstyrene, 2,4-dimethylstyrene, 2,5-dimethylstyrene, para-α-dimethylstyrene, 2-ethylstyrene, 3-ethylstyrene, 4-ethylstyrene, 2-isopropylstyrene, 3-isopropylstyrene, 4-isopropylstyrene, ortho-divinylbenzene, meta-divinylbenzene, para-divinylbenzene, ethoxystyrene, chlorostyrene, bromostyrene, dibromostyrene, dichlorostyrene, tribromostyrene, trichlorostyrene, 2-vinylnaphthalene, and 2-isopropenyl naphthalene, wherein the styrene-acrylonitrile copolymer is selected from the group consisting of styrene / acrylonitrile copolymer, α-methylstyrene / acrylonitrile copolymer, styrene acrylonitrile-maleic anhydride copolymer, styrene-acrylonitrile-phenylmaleimide copolymer, α-methylstyrene-acrylonitrile-methyl methacrylate copolymer, α-methylstyrene-acrylonitrile-t-butyl methacrylate copolymer, and styrene-acrylonitrile-t-butyl methacrylate copolymer, and the amorphous copolyester is cyclohexanedimethylene modified poly(ethylene terephthalate), ethylene modified poly(1,4-cyclohexanedimethylene terephthalate), or a mixture thereof, (C) 0.01 to 2 mass % or 0.05 to 0.5 mass % of an alkali metal carbonate and / or bicarbonate, (D) 10 to 40% by weight of glass fibers, preferably E-glass fibers, and (E) 0.01 to 15 mass% of additives Includes.

[0142] In another preferred embodiment 63, the PBT composition comprises, based on the total weight of the PBT composition: (A) 40 to 80 mass% of a polybutylene terephthalate resin, (B) 5 to 40 mass % of an amorphous polymer selected from the group consisting of polystyrene, polymethylstyrene, styrene / acrylonitrile copolymer, α-methylstyrene / acrylonitrile copolymer, styrene-acrylonitrile-maleic anhydride copolymer, PETG, and PCTG; (C) 0.01 to 5% by mass of sodium carbonate or potassium carbonate and / or sodium bicarbonate or potassium bicarbonate; (D) 0 to 50% by weight of glass fibers, preferably E-glass fibers, and (E) 0 to 15% by mass of additives Includes.

[0143] In another preferred embodiment 64, the PBT composition comprises, based on the total weight of the PBT composition: (A) 40 to 80 mass% of a polybutylene terephthalate resin, (B) 5 to 35 mass % of an amorphous polymer selected from the group consisting of polystyrene, polymethylstyrene, styrene / acrylonitrile copolymer, α-methylstyrene / acrylonitrile copolymer, styrene-acrylonitrile-maleic anhydride copolymer, PETG, and PCTG; (C) 0.01 to 5% by mass of sodium carbonate or potassium carbonate and / or sodium bicarbonate or potassium bicarbonate; (D) 0 to 50% by weight of glass fibers, preferably E-glass fibers, and (E) 0 to 15% by mass of additives Includes.

[0144] In another preferred embodiment 65, the PBT composition comprises, based on the total weight of the PBT composition: (A) 40 to 80 mass% of a polybutylene terephthalate resin, (B) 5 to 40 mass % of an amorphous polymer selected from the group consisting of polystyrene, polymethylstyrene, styrene / acrylonitrile copolymer, α-methylstyrene / acrylonitrile copolymer, styrene-acrylonitrile-maleic anhydride copolymer, PETG, and PCTG; (C) 0.01 to 2% by weight or 0.05 to 0.5% by weight of sodium carbonate or potassium carbonate and / or sodium bicarbonate or potassium bicarbonate, (D) 0 to 50% by weight of glass fibers, preferably E-glass fibers, and (E) 0 to 15% by mass of additives Includes.

[0145] In another preferred embodiment 66, the PBT composition comprises, based on the total weight of the PBT composition: (A) 40 to 80 mass% of a polybutylene terephthalate resin, (B) 5 to 35 mass % of an amorphous polymer selected from the group consisting of polystyrene, polymethylstyrene, styrene / acrylonitrile copolymer, α-methylstyrene / acrylonitrile copolymer, styrene-acrylonitrile-maleic anhydride copolymer, PETG, and PCTG; (C) 0.01 to 2% by weight or 0.05 to 0.5% by weight of sodium carbonate or potassium carbonate and / or sodium bicarbonate or potassium bicarbonate, (D) 0 to 50% by weight of glass fibers, preferably E-glass fibers, and (E) 0 to 15% by mass of additives Includes.

[0146] In another preferred embodiment 67, the PBT composition comprises, based on the total weight of the PBT composition: (A) 40 to 80 mass% of a polybutylene terephthalate resin, (B) 5 to 35 mass % of an amorphous polymer selected from the group consisting of polystyrene, polymethylstyrene, styrene / acrylonitrile copolymer, α-methylstyrene / acrylonitrile copolymer, styrene-acrylonitrile-maleic anhydride copolymer, PETG, and PCTG; (C) 0.01 to 5% by mass of sodium carbonate or potassium carbonate and / or sodium bicarbonate or potassium bicarbonate; (D) 10 to 40% by weight of glass fibers, preferably E-glass fibers, and (E) 0.01 to 15 mass% of additives Includes.

[0147] In another preferred embodiment 68, the PBT composition comprises, based on the total weight of the PBT composition: (A) 10 to 90 mass% of a polybutylene terephthalate resin, (B) 1 to 50 mass % of an amorphous polymer selected from the group consisting of polystyrene, polymethylstyrene, styrene / acrylonitrile copolymer, α-methylstyrene / acrylonitrile copolymer, styrene-acrylonitrile-maleic anhydride copolymer, PETG, and PCTG; (C) 0.01 to 2% by weight or 0.05 to 0.5% by weight of sodium carbonate or potassium carbonate and / or sodium bicarbonate or potassium bicarbonate, (D) 10 to 40% by weight of glass fibers, preferably E-glass fibers, and (E) 0.01 to 15 mass% of additives Includes.

[0148] In another preferred embodiment 69, the PBT composition comprises, based on the total weight of the PBT composition: (A) 40 to 80 mass% of a polybutylene terephthalate resin, (B) 5 to 40 mass % of an amorphous polymer selected from the group consisting of polystyrene, polymethylstyrene, styrene / acrylonitrile copolymer, α-methylstyrene / acrylonitrile copolymer, styrene-acrylonitrile-maleic anhydride copolymer, PETG, and PCTG; (C) 0.01 to 5% by mass of sodium carbonate or potassium carbonate and / or sodium bicarbonate or potassium bicarbonate; (D) 0 to 50% by weight of glass fibers, preferably E-glass fibers, and (E) 0.01 to 15 mass % of additives, including 0.01 to 3 mass % of a lubricant; Includes.

[0149] In another preferred embodiment 70, the PBT composition comprises, based on the total weight of the PBT composition: (A) 40 to 80 mass% of a polybutylene terephthalate resin, (B) 5 to 35 mass % of an amorphous polymer selected from the group consisting of polystyrene, polymethylstyrene, styrene / acrylonitrile copolymer, α-methylstyrene / acrylonitrile copolymer, styrene-acrylonitrile-maleic anhydride copolymer, PETG, and PCTG; (C) 0.01 to 2% by weight or 0.05 to 0.5% by weight of sodium carbonate or potassium carbonate and / or sodium bicarbonate or potassium bicarbonate, (D) 0 to 50% by weight of E-glass fibers, and (E) 0 to 15 mass % of additives, including 0.01 to 3 mass % of a lubricant; Includes.

[0150] In another preferred embodiment 71, the PBT composition comprises, based on the total weight of the PBT composition: (A) 40 to 80 mass% of a polybutylene terephthalate resin, (B) 5 to 40 mass % of an amorphous polymer selected from the group consisting of polystyrene, polymethylstyrene, styrene / acrylonitrile copolymer, α-methylstyrene / acrylonitrile copolymer, styrene-acrylonitrile-maleic anhydride copolymer, PETG, and PCTG; (C) 0.01 to 5% by mass of sodium carbonate or potassium carbonate and / or sodium bicarbonate or potassium bicarbonate; (D) 10 to 40% by weight of E-glass fibers, and (E) 0.01 to 15 mass % of additives, including 0.01 to 3 mass % of a lubricant; Includes.

[0151] In another preferred embodiment, the PBT composition comprises, based on the total weight of the PBT composition: (A) 40 to 80 mass% of a polybutylene terephthalate resin, (B) 5 to 35 mass % of an amorphous polymer selected from the group consisting of polystyrene, polymethylstyrene, styrene / acrylonitrile copolymer, α-methylstyrene / acrylonitrile copolymer, styrene-acrylonitrile-maleic anhydride copolymer, PETG, and PCTG; (C) 0.01 to 5% by mass of sodium carbonate or potassium carbonate and / or sodium bicarbonate or potassium bicarbonate; (D) 10 to 40% by weight of E-glass fibers, and (E) 0.01 to 15 mass % of additives, including 0.01 to 3 mass % of a lubricant; Includes.

[0152] In another preferred embodiment, the PBT composition comprises, based on the total weight of the PBT composition: (A) 20 to 80 mass % of a polybutylene terephthalate resin, (B) 5 to 40 mass % of an amorphous polymer selected from the group consisting of polystyrene, polymethylstyrene, styrene / acrylonitrile copolymer, α-methylstyrene / acrylonitrile copolymer, styrene-acrylonitrile-maleic anhydride copolymer, PETG, and PCTG; (C) 0.01 to 2% by weight or 0.05 to 0.5% by weight of sodium carbonate or potassium carbonate and / or sodium bicarbonate or potassium bicarbonate, (D) 10 to 40% by weight of E-glass fibers, and (E) 0.01 to 15 mass % of additives, including 0.01 to 3 mass % of a lubricant; Includes.

[0153] In another preferred embodiment 74, the PBT composition comprises, based on the total weight of the PBT composition: (A) 40 to 80 mass% of a polybutylene terephthalate resin, (B) 5 to 35 mass % of an amorphous polymer selected from the group consisting of polystyrene, polymethylstyrene, styrene / acrylonitrile copolymer, α-methylstyrene / acrylonitrile copolymer, styrene-acrylonitrile-maleic anhydride copolymer, PETG, and PCTG; (C) 0.01 to 2% by weight or 0.05 to 0.5% by weight of sodium carbonate or potassium carbonate and / or sodium bicarbonate or potassium bicarbonate, (D) 10 to 40% by weight of E-glass fibers, and (E) 0.01 to 15 mass % of additives, including 0.01 to 3 mass % of a lubricant; Includes.

[0154] The PBT composition according to the present invention can be processed into various structures or forms by conventional methods to provide articles with improved laser transmittance. For example, all components of the PBT composition according to the present invention can be mixed and then molded in a conventional mixing device, such as a screw extruder, mixer, for example via injection and / or extrusion to form an article. The mixing temperature used here is generally 220°C to 260°C.

[0155] It is understood that all the components of the PBT composition can be mixed at the same time. Alternatively, some components of the PBT composition can be premixed and then mixed with other components. For example, all the components of the PBT composition except glass fiber can be mixed together in a mixer and fed into the throat of a twin screw extruder, and then the glass fiber can be fed downstream using a side feeder.

[0156] Thus, the present invention provides an article made from a PBT composition according to the present invention.

[0157] Articles according to the invention have a laser transmission of greater than 30% at 1064 nm for a 2 mm sample.

[0158] Thus, articles made from the PBT composition according to the present invention can be used in many fields including, but not limited to, automotive, electrical, mechanical engineering, other means of transport, housing materials for appliances, devices for telecommunications, consumer electronics, household devices, fasteners for installation works, containers, or any kind of ventilation parts.

[0159] Articles that can be manufactured from the PBT composition according to the present invention are sensors, electronic control units, or advanced driver assistance systems (ADAS) devices for automotive applications, etc.

[0160] The present invention also provides the use of an alkali metal carbonate and / or bicarbonate in improving the laser transmittance of a polybutylene terephthalate composition. The polybutylene terephthalate composition preferably comprises an amorphous polymer having a refractive index of at least 1.55 and having no carbonate groups in the repeat unit of the amorphous polymer.

[0161] Implementation Various embodiments are listed below. It should be understood that the embodiments listed below can be combined with all aspects and other embodiments according to the scope of the present invention.

[0162] 1. (A) Polybutylene terephthalate resin, (B) an amorphous polymer having a refractive index of at least 1.55 and having no carbonate group in the repeat unit of the amorphous polymer; (C) alkali metal carbonates and / or bicarbonates; (D) optionally, glass fibers; and (E) Optional Additives 1. A polybutylene terephthalate composition comprising:

[0163] 2. The polybutylene terephthalate composition according to embodiment 1, wherein the amorphous polymer (B) has a refractive index of 1.55 to 1.60.

[0164] 3. The polybutylene terephthalate composition of embodiment 1 or 2, wherein the amorphous polymer is selected from the group consisting of polystyrene, styrene-acrylonitrile copolymers, amorphous copolyesters, and mixtures thereof.

[0165] 4. the polystyrene comprises from 50 mol % to 100 mol %, preferably from 60 mol % to 99.5 mol %, most preferably from 70 mol % to 99.5 mol %, of units derived from at least one monomer having formula I, relative to the total units of the polystyrene; [ka] In the above formula, R1 is the same or different and is hydrogen, C1 to C 10 -Alkyl group, C1-C6-alkenyl group, C4-C 10 -Alicyclic group, C6~C 12 - selected from the group consisting of aromatic hydrocarbon groups, C1-C4 alkoxy groups and halogen atoms, R2 being hydrogen and / or C1-C4 alkyl groups, Styrene-acrylonitrile copolymer contains, relative to the total weight of the monomers of the styrene-acrylonitrile copolymer, (B.1) 50 to 99 parts by weight of vinyl aromatic monomer and / or ring-substituted vinyl aromatic monomer, (B.2) 1 to 50 parts by mass of a vinyl cyanide monomer, and optionally (B.3) C1-C8-alkyl methacrylate Contains, or the amorphous copolyester has at least two different repeat units RP1 and RP2 in a total amount of at least 55 mol %, preferably at least 80 mol %, more preferably at least 90 mol %, based on the total repeat units of the copolyester, the repeating unit RP1 is derived from a glycol and a dicarboxylic acid, the dicarboxylic acid comprising terephthalic acid and optionally other dicarboxylic acids, and the repeating unit RP2 is derived from a glycol and a dicarboxylic acid, the molar ratio of glycol in RP1 to glycol in RP2 being 2:8 to 8:2; The polybutylene terephthalate composition of any one of embodiments 1 to 3.

[0166] 5. Formula I is selected from the group consisting of styrene, α-methylstyrene, 2-methylstyrene, 3-methylstyrene, 4-methylstyrene, 2,4-dimethylstyrene, 2,5-dimethylstyrene, para-α-dimethylstyrene, 2-ethylstyrene, 3-ethylstyrene, 4-ethylstyrene, 2-isopropylstyrene, 3-isopropylstyrene, 4-isopropylstyrene, ortho-divinylbenzene, meta-divinylbenzene, para-divinylbenzene, ethoxystyrene, chlorostyrene, bromostyrene, dibromostyrene, dichlorostyrene, tribromostyrene, trichlorostyrene, 2-vinylnaphthalene and 2-isopropenylnaphthalene; the styrene-acrylonitrile copolymer is selected from the group consisting of styrene / acrylonitrile copolymer, α-methylstyrene / acrylonitrile copolymer, styrene acrylonitrile-maleic anhydride copolymer, styrene-acrylonitrile-phenylmaleimide copolymer, α-methylstyrene-acrylonitrile-methyl methacrylate copolymer, α-methylstyrene-acrylonitrile-t-butyl methacrylate copolymer, and styrene-acrylonitrile-t-butyl methacrylate copolymer; The amorphous copolyester is cyclohexanedimethylene modified poly(ethylene terephthalate), ethylene modified poly(1,4-cyclohexanedimethylene terephthalate) and mixtures thereof; The polybutylene terephthalate composition of any one of embodiments 1 to 4.

[0167] 6. The polybutylene terephthalate composition of any one of embodiments 1 to 5, wherein the alkali metal carbonate and / or bicarbonate (C) is selected from the group consisting of sodium carbonate, sodium bicarbonate, potassium carbonate and potassium bicarbonate.

[0168] 7. The polybutylene terephthalate composition according to any one of embodiments 1 to 6, wherein the polybutylene terephthalate resin (A) is present in an amount of 10% by mass to 90% by mass, preferably 20% by mass to 80% by mass, and more preferably 40% by mass to 80% by mass, based on the total mass of the polybutylene terephthalate composition.

[0169] 8. The polybutylene terephthalate composition according to any one of embodiments 1 to 7, wherein the amorphous polymer (B) is present in an amount of 1% by mass to 50% by mass, preferably 5% by mass to 40% by mass, and more preferably 5% by mass to 35% by mass, based on the total mass of the PBT composition.

[0170] 9. The polybutylene terephthalate composition according to any one of embodiments 1 to 8, wherein the alkali metal carbonate and / or bicarbonate (C) is present in an amount of 0.01% to 10% by weight, preferably 0.01% to 5% by weight, more preferably 0.01% to 2% by weight, and most preferably 0.05% to 0.5% by weight, based on the total weight of the PBT composition.

[0171] 10. The polybutylene terephthalate composition according to any one of embodiments 1 to 9, wherein the glass fiber (D) is present in an amount of 0% by mass to 50% by mass, preferably 10% by mass to 40% by mass, and more preferably 20% by mass to 35% by mass, based on the total mass of the polybutylene terephthalate composition.

[0172] 11. The polybutylene terephthalate composition of any one of the preceding embodiments, wherein the glass fibers (D) are E-glass fibers and / or D-glass fibers.

[0173] 12. The polybutylene terephthalate composition according to any one of embodiments 1 to 11, wherein the additive (E) is present in an amount of 0.01% by weight to 15% by weight, based on the total weight of the polybutylene terephthalate composition.

[0174] 13. An article made from the polybutylene terephthalate composition of any one of embodiments 1 to 12.

[0175] 14. The article of embodiment 13, wherein the article is a sensor, an electronic control unit, or an advanced driver assistance system device for an automobile.

[0176] 15. Use of alkali metal carbonates and / or bicarbonates in improving the laser transmittance of polybutylene terephthalate compositions.

[0177] 16. The use of embodiment 15, wherein the polybutylene terephthalate composition is as described in any one of embodiments 1 to 12. EXAMPLES

[0178] The disclosure of the invention found within this application should be considered to cover all embodiments found within the claims as multiple dependent on each other, regardless of whether the claims may be found multiple dependent or non-overlapping.

[0179] The following examples are provided to facilitate understanding of the invention and are not intended to limit the scope of the claims.

[0180] material PBT base resin: PBT 1100-211MB, Ultradur B4500, Ultradur B2550 (BASF) Lubricant or processing agent: LOXIOL P 861 / 3.5 (IMCD Deutschland GmbH&Co.KG) PS: PS POLYREX (registered trademark) PG-383M (CHIMEI), refractive index 1.59 PETG: PETG S2008 (SK chemical), refractive index 1.55 SAN: SAN Chimei PN-128L100 (CHIMEI), refractive index 1.57 Polypropylene: PP F401 (Sinopec Yangzi Petrochemical), refractive index 1.47 PMMA: PMMA ACRYREX® CM-211 (CHIMEI), refractive index 1.48 COC: Cycloolefin copolymers (Polyplastics), refractive index 1.53 E-glass fiber, round: PBT-NEG-T187H (Nippon Electric Glass) E-glass fiber, flat glass fiber: CSG3PA820 (Nittobo) D-Glass Fiber (D-GF): ECS303(HL)303N-3 (Chongqing Polycomp) Antioxidant: Irganox 1010 (BASF) The refractive index is specified at 25° C. and a wavelength of 589 nm according to ASTM D542.

[0181] According to the present invention, the following test methods are adopted in measuring the properties in all the examples.

[0182] measurement Laser Transmittance BASF method: An infrared laser with a wavelength of 1064 nm, laser type: Nd:YAG is used, and the laser transmittance is measured using a sample with a thickness (plate) of 2 mm.

[0183] Thermoelectric power measurements were used to determine the laser transmittance at a wavelength of 1064 nm. The measurement geometry was set as follows: From a laser beam (diode-pumped Nd-YAG laser, wavelength 1064 nm, FOBA DP50) with a total power of 2 watts, a reference beam with a power of 1 watt was split off at an angle of 90° using a beam splitter (SQ2 non-polarizing beam splitter (Laseroptik GmbH)). The reference beam was directed to a reference sensor. The part of the original beam that passed through the beam splitter provided a measurement beam, also with a power of 1 watt. This measurement beam was focused to a focal point with a diameter of 0.18 μm via a mode diaphragm (5.0) behind the beam splitter. The laser transmission (LT) measurement sensor was placed 80 mm below the focal point. The test sheet was placed 2 mm above the LT measurement sensor. The total measurement time was 30 seconds, and the measurement result was determined within the last 5 seconds. The signals from the reference and measurement sensors were captured simultaneously. The start of the measurement was simultaneous with the insertion of the sample.

[0184] The laser transmittance was obtained from the following formula:

number

[0185] Signal 1 is the signal captured by the measurement sensor and signal 2 is the signal captured by the reference sensor. This measurement method eliminates laser system variations and subjective reading errors.

[0186] LPKF Method: Adopting an infrared laser with a wavelength of 980 nm, using a sample with a thickness (plate) of 1.4 mm, measure the laser transmittance by LPKF TMG 3, an in-line or stand-alone transmission test system.

[0187] The tensile modulus (MPa), tensile strength at break (MPa) and elongation at break (%) were determined in particular in accordance with ISO 527-1-2012. Test specimens of type 1A as described in ISO 527-1-2012 were used.

[0188] The Charpy notched impact strength was tested via edgewise impact according to ISO 179-1-2010. The test specimens are type 1 with notches type A.

[0189] Melt flow tests were performed according to ISO 1133 at 250°C and 2.16 kg or 275°C and 5 kg.

[0190] Thermal properties included HDT A at 1.80 MPa and HDT B at 0.45 MPa and were obtained according to ISO 75-1 / -2.

[0191] Dk / 2GHz and Df / 2GHz: Dk and Df under 2GHz were tested according to GB / T 12636-90, and Dk and Df under 2.5GHz were tested according to IEC 60250.

[0192] Preparation of PBT composition A ZSK18 twin screw extruder commercially available from Coperion was used in the production of all PBT compositions, with compounding conditions including the following: barrel temperature for zones 1-4 was 250°C, zones 5-6 were held at 255°C, screw speed was 300 rpm, and throughput was 7 kg / hr.

[0193] At the start of the process, all ingredients were metered into a high speed mixer to obtain a premix, which was then fed into the extruder through a hopper.

[0194] Dry pellets of the PBT composition were processed in an injection molding machine (KM130CX (Krauss Maffei)) at a clamping force of 130 T and a melt temperature of 220° C. to 260° C. to prepare test samples.

[0195] The resulting test samples were measured for properties as described above. The test results and the recipes for producing the test samples are summarized in Tables 1-6.

[0196] [Table 1]

[0197] [Table 2]

[0198] [Table 3]

[0199] [Table 4]

[0200] [Table 5]

[0201] [Table 6]

Claims

1. (A) polybutylene terephthalate resin, (B) an amorphous polymer having a refractive index of at least 1.55 and no carbonate groups in the repeating units of the amorphous polymer, wherein the refractive index is measured at 25°C and at a wavelength of 589 nm in accordance with ASTM D542; (C) alkali metal carbonates and / or bicarbonates; (D) optionally, glass fibers, and (E) Optional Additives 1. A polybutylene terephthalate composition comprising:

2. 2. The polybutylene terephthalate composition according to claim 1, wherein the amorphous polymer (B) has a refractive index of 1.55 to 1.

60.

3. 2. The polybutylene terephthalate composition of claim 1, wherein the amorphous polymer is selected from the group consisting of polystyrene, styrene-acrylonitrile copolymers, amorphous copolyesters, and mixtures thereof.

4. the polystyrene comprises from 50 mol % to 100 mol %, preferably from 60 mol % to 99.5 mol %, most preferably from 70 mol % to 99.5 mol %, of units derived from at least one monomer having formula I, relative to the total units of the polystyrene; 【Chemistry 1】 In the formula, R 1 are the same or different and are hydrogen, C 1 ~C 10 - alkyl group, C 1 ~C 6 -alkenyl group, C 4 ~C 10 -Alicyclic group, C 6 ~C 12 - aromatic hydrocarbon group, C 1 ~C 4 - is selected from the group consisting of alkoxy groups and halogen atoms, R 2 is hydrogen and / or C 1 ~C 4 - is an alkyl group, The styrene-acrylonitrile copolymer contains, relative to the total mass of the monomers of the styrene-acrylonitrile copolymer, (B.1) 50 to 99 parts by weight of vinyl aromatic monomers and / or ring-substituted vinyl aromatic monomers, (B.2) 1 to 50 parts by weight of a vinyl cyanide monomer, and optionally (B.3) C 1 ~C 8 -Alkyl methacrylate contains, or The amorphous copolyester has at least two different repeating units RP 1 and RP 2 in a total amount of at least 55 mol %, preferably at least 80 mol %, more preferably at least 90 mol %, based on the total repeat units of the copolyester; The repeating unit RP 1 is derived from glycols and dicarboxylic acids, said dicarboxylic acids including terephthalic acid, and optionally other dicarboxylic acids, and said repeating unit RP 2 is derived from glycols and dicarboxylic acids, RP 1 Glycol in RP 2 the molar ratio of glycol to propylene glycol is 2:8 to 8:2; The polybutylene terephthalate composition of claim 1.

5. Formula I is selected from the group consisting of styrene, α-methylstyrene, 2-methylstyrene, 3-methylstyrene, 4-methylstyrene, 2,4-dimethylstyrene, 2,5-dimethylstyrene, para-α-dimethylstyrene, 2-ethylstyrene, 3-ethylstyrene, 4-ethylstyrene, 2-isopropylstyrene, 3-isopropylstyrene, 4-isopropylstyrene, ortho-divinylbenzene, meta-divinylbenzene, para-divinylbenzene, ethoxystyrene, chlorostyrene, bromostyrene, dibromostyrene, dichlorostyrene, tribromostyrene, trichlorostyrene, 2-vinylnaphthalene and 2-isopropenylnaphthalene; the styrene-acrylonitrile copolymer is selected from the group consisting of styrene / acrylonitrile copolymer, α-methylstyrene / acrylonitrile copolymer, styrene acrylonitrile-maleic anhydride copolymer, styrene-acrylonitrile-phenylmaleimide copolymer, α-methylstyrene-acrylonitrile-methyl methacrylate copolymer, α-methylstyrene-acrylonitrile-t-butyl methacrylate copolymer, and styrene-acrylonitrile-t-butyl methacrylate copolymer; the amorphous copolyester is cyclohexanedimethylene-modified poly(ethylene terephthalate), ethylene-modified poly(1,4-cyclohexanedimethylene terephthalate), or a mixture thereof; The polybutylene terephthalate composition of claim 1.

6. 2. The polybutylene terephthalate composition of claim 1, wherein the alkali metal carbonate and / or bicarbonate (C) is selected from the group consisting of sodium carbonate, sodium bicarbonate, potassium carbonate, and potassium bicarbonate.

7. 2. The polybutylene terephthalate composition according to claim 1, wherein the polybutylene terephthalate resin (A) is present in an amount of 10% to 90% by weight, preferably 20% to 80% by weight, and more preferably 40% to 80% by weight, based on the total weight of the polybutylene terephthalate composition.

8. 2. The polybutylene terephthalate composition according to claim 1, wherein the amorphous polymer (B) is present in an amount of 1% to 50% by weight, preferably 5% to 40% by weight, and more preferably 5% to 35% by weight, based on the total weight of the polybutylene terephthalate composition.

9. 2. The polybutylene terephthalate composition of claim 1, wherein the alkali metal carbonate and / or bicarbonate (C) is present in an amount of 0.01% to 10% by weight, preferably 0.01% to 5% by weight, more preferably 0.01% to 2% by weight, and most preferably 0.05% to 0.5% by weight, based on the total weight of the polybutylene terephthalate composition.

10. The polybutylene terephthalate composition according to claim 1, wherein the glass fiber (D) is present in an amount of 0 to 50% by mass, preferably 10 to 40% by mass, and more preferably 20 to 35% by mass, relative to the total mass of the polybutylene terephthalate composition.

11. 2. The polybutylene terephthalate composition according to claim 1, wherein the glass fiber (D) is an E-glass fiber and / or a D-glass fiber.

12. 2. The polybutylene terephthalate composition of claim 1, wherein the additive (E) is present in an amount of 0.01% to 15% by weight, based on the total weight of the polybutylene terephthalate composition.

13. 13. An article made from the polybutylene terephthalate composition of any one of claims 1 to 12.

14. 14. The article of claim 13, wherein the article is a sensor, an electronic control unit, or an advanced driver assistance system device for a motor vehicle.

15. Use of alkali metal carbonates and / or bicarbonates in improving the laser transmittance of polybutylene terephthalate compositions.

16. 16. The use according to claim 15, wherein the polybutylene terephthalate composition is according to any one of claims 1 to 12.

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