Polyester composition and molding of the same

Abstract

To provide a polyester composition and a product thereof.SOLUTION: A polyester composition contains polybutylene terephthalate resin and is analyzed by small-angle X-ray scattering (SAXS). A spectrum in which the vertical axis expresses scattering intensity and the horizontal axis expresses a scattering vector is obtained. Inclination of SAXS spectrum ranges in the range from -2.00 to -4.20 in a scattering vector from 0.15 nm-1 to 0.20 nm-1. A polyester composition having the above characteristics has improved laser transmittance and low electromagnetic wave transmission loss, which can improve the value of a plastic product connected by laser welding.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to a polyester composition and a molded article produced from the composition, and more particularly to a polyester composition containing polybutylene terephthalate resin (PBT resin) and a molded article produced from the composition.

Background Art

[0002] Laser welding is a technique that uses a laser beam to join two objects. When laser welding is used to join two or more polymer parts, the heat generated from the laser beam melts the interface between the polymer parts and then solidifies the melted material during a subsequent cooling process to join the two or more polymer parts. Compared with conventional plastic joining, laser welding is particularly suitable for precision joining that requires, for example, a delicate welding seam because the welding area can be accurately controlled.

[0003] Among various thermoplastic resins, PBT has become one of the polyester materials that can be widely used in laser welding because PBT has good mechanical properties, good moldability, good chemical stability, and good dimensional stability.

[0004] However, polyester materials are restricted by their low transmittance to laser beams and have not been suitable for use in laser welding until now. When laser welding is adopted to join plastic objects, restrictions occur in the design, thus impeding the improvement of the welding speed. In addition, the electromagnetic wave transmission loss of available polyester materials also needs to be improved so that laser welding can be effectively used in products in the vehicle, information transmission, aerospace, and medical industries, which are expected to meet the requirements of next-generation high-frequency communication.

[0005] Therefore, there is still a need to improve the transmittance of polyester materials to laser beams and the electromagnetic wave transmission loss in order to overcome the drawbacks of the prior art.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0007] Considering the above technical deficiencies, an object of the present disclosure is to improve the laser transmittance of the polyester composition, thereby expanding the applications and adaptability of laser welding, and enhancing the value of the welded plastic products.

[0008] Another object of the present disclosure is to reduce the electromagnetic wave transmission loss of the polyester composition so as to meet the requirements of next-generation high-frequency communication.

Means for Solving the Problems

[0009] To achieve the above object, the present disclosure provides a polyester composition containing a PBT resin. The polyester composition is analyzed by small-angle X-ray scattering (SAXS) to obtain a spectrum in which the vertical axis represents the scattering intensity and the horizontal axis represents the scattering vector. In the spectrum, within the scattering vector ranging from 0.15 nm -1 to 0.20 nm -1 the SAXS spectrum of the polyester composition has a slope ranging from -2.00 to -4.20.

[0010] Furthermore, the present disclosure also provides a molded article manufactured from a raw material containing the above polyester composition.

[0011] By controlling the tilt, within a specific scattering vector in the SAXS spectrum, the polyester composition of the present disclosure can exhibit improved laser transmittance and low electromagnetic wave transmission loss. Therefore, compared with conventional polyester materials, the polyester composition of the present disclosure and / or its molded article exhibit higher total transmittance under near-infrared light, and the polyester composition and / or its molded article exhibit lower dielectric constant and / or dissipation factor.

[0012] According to the present disclosure, compared with conventional polyester materials, the polyester composition of the present disclosure and / or its molded article exhibit both high laser transmittance and low electromagnetic wave transmission loss. Therefore, the polyester composition of the present disclosure product and / or its molded article can be particularly suitable for products in the fields of vehicles, information transmission, aerospace, and medical industries, such as connectors, sensors, controller or camera housings, or 5G information communication bodies, but not limited thereto.

[0013] Optionally, within the scattering vector ranging from 0.15 nm -1 to 0.20 nm -1 the slope of the SAXS spectrum of the polyester composition and / or its molded article may be -2.00, -2.10, -2.20, -2.30, -2.40, -2.50, -2.60, -2.70, -2.80, -2.90, -3.00, -3.10, -3.20, -3.30, -3.40, -3.50, -3.60, -3.70, -3.80, -3.90, -4.00, -4.10 or -4.20, or the slope may fall within the range between any two of the above values. Preferably, within the range from 0.15 nm -1 to 0.20 nm -1In the scattering vector range up to, the slope of the SAXS spectrum of the polyester composition and / or its molded article may be in the range of -3.00 to -4.20. In this specification, the SAXS spectrum is obtained by analyzing a molded article (i.e., a test piece) with a thickness of 2.0 millimeters (mm) at 25°C using Cu Kα radiation having a wavelength of about 1.54 Å as the light source of the incident beam. The molded article is manufactured from the polyester composition, and the small-angle scattering system is available from Bruker N8 HORIZON, i.e., the model of the small-angle scattering system is N8 Horizon manufactured by Bruker Corporation.

[0014] According to the present disclosure, the polyester composition and / or its molded article may have a total transmittance of 33%, 34%, 35%, 40%, 45%, 50%, 55%, 60%, 65% or 70%, or the total transmittance may fall within the range between any two of the above values, for example, in the range of 35% to 70%. In one embodiment, for example, the polyester composition and / or its molded article does not contain any glass fiber, and the polyester composition and / or its molded article may have a total transmittance ranging from 33% to 70% in the near-infrared (NIR) spectrum at a wavelength of 1064 nm. In another embodiment, for example, the polyester composition and / or its molded article contains glass fiber, and the polyester composition and / or its molded article may have a total transmittance ranging from 50% to 70% in the near-infrared spectrum at a wavelength of 1064 nm. In this specification, the total transmittance in the near-infrared spectrum is obtained by measuring its molded article with a thickness of 2 mm.

[0015] According to the present disclosure, the polyester composition and / or its molded article may have a dissipation factor (Df) of 0.008, 0.007, 0.006 or 0.005 or less at a frequency of 40 gigahertz (GHz). Optionally, the Df of the polyester composition and / or its molded article may be 0.002, 0.003, 0.004, 0.005, 0.006, 0.007 or 0.008 at a frequency of 40 GHz, or the Df may fall within the range between any two of the above values at a frequency of 40 GHz. For example, the Df may be from 0.002 to 0.008 at a frequency of 40 GHz. In one embodiment, for example, the polyester composition and / or its molded article does not contain any glass fibers, and the polyester composition and / or its molded article may have a Df in the range of 0.007 or less, or less than 0.007, or 0.006 or less, or in the range of 0.002 or more and 0.007 or less, or in the range of 0.002 or more and less than 0.007, or in the range of 0.002 or more and 0.006 or less at 40 GHz. In another embodiment, for example, the polyester composition and / or its molded article contains glass fibers, and the polyester composition and / or its molded article may have a Df in the range of less than 0.008, or 0.007 or less, or in the range of 0.002 or more and less than 0.008, or in the range of 0.002 or more and 0.007 or less at 40 GHz. As used herein, Df is obtained by measuring its molded article with a thickness of 0.2 mm according to the IPC-TM650 2.5.5.13 test method.

[0016] According to the present disclosure, the polyester composition and / or its molded article may have a dielectric constant (Dk) of 3.00, 2.90, 2.80, 2.70, or 2.60 or less at a frequency of 40 GHz. Optionally, the Dk of the polyester composition and / or its molded article may be 2.00, 2.10, 2.20, 2.30, 2.40, 2.50, 2.60, 2.70, 2.80, 2.90, or 3.00 at a frequency of 40 GHz, or the Dk may fall within the range between any two of the above values at a frequency of 40 GHz. For example, the Dk may be from 2.00 to 3.00 at a frequency of 40 GHz. In one embodiment, for example, the polyester composition and / or its molded article does not contain any glass fiber, and the polyester composition and / or its molded article may have a Dk in the range of 2.66 or less, or in the range of 2.00 or more and 2.66 or less at 40 GHz. In another embodiment, for example, the polyester composition and / or its molded article contains glass fiber, and the polyester composition and / or its molded article may have a Dk in the range of 3.00 or less, or in the range of 2.00 or more and 3.00 or less at 40 GHz. In this specification, Dk is obtained by measuring its molded article with a thickness of 0.2 mm according to the IPC-TM650 2.5.5.13 test method.

[0017] Optionally, the tensile modulus of the polyester composition and / or its molded article may be 2600 MPa, 2700 MPa, 2800 MPa, …, 5000 MPa, 6000 MPa, 7000 MPa, 8000 MPa, 9000 MPa, 10000 MPa, 11000 MPa or 12000 MPa, or the tensile modulus may fall within the range between any two of the above values. For example, the tensile modulus may be from 2600 MPa to 12000 MPa. In one embodiment, for example, the polyester composition and / or its molded article does not contain any glass fiber, and the polyester composition and / or its molded article may have a tensile modulus of 2600 MPa or more, or 2700 MPa or more. In another embodiment, for example, the polyester composition and / or its molded article contains glass fiber, and the polyester composition and / or its molded article may have a tensile modulus of 5000 MPa or more, or 10000 MPa or more. In this specification, the tensile modulus is obtained by measuring its molded article with a thickness of 4.0 mm in accordance with the ISO 527:2019 test method.

[0018] Optionally, the flexural modulus of the polyester composition and / or its molded article may be 2300 MPa, 2400 MPa, 2500 MPa, 2600 MPa, 2700 MPa, 2800 MPa, 2900 MPa, 3000 MPa, …, 4000 MPa, 5000 MPa, 6000 MPa, 7000 MPa, 8000 MPa, 9000 MPa, 10000 MPa or 12000 MPa, or the flexural modulus may fall within the range between any two of the above values. For example, the flexural modulus may be from 2300 MPa to 12000 MPa. In one embodiment, for example, the polyester composition and / or its molded article does not contain any glass fiber, and the polyester composition and / or its molded article may have a flexural modulus of 2300 MPa or more, or 2400 MPa or more, or ranging from 2300 MPa to 3000 MPa. In another embodiment, for example, the polyester composition and / or its molded article contains glass fiber, and the polyester composition and / or its molded article may have a flexural modulus of 4000 MPa or more, or 8000 MPa or more, or ranging from 5000 MPa to 10000 MPa. In this specification, the flexural modulus is obtained by measuring its molded article with a thickness of 4.0 mm in accordance with the ISO 178:2019 test method.

[0019] Optionally, the heat distortion temperature (HDT) of the polyester composition and / or its molded article may be 60°C, 65°C, 70°C, 75°C, 80°C, 85°C, 90°C, 95°C, …, 150°C, 155°C, 160°C, 165°C, 175°C, 180°C, 185°C, 190°C or 195°C, or the HDT may fall within the range between any two of the above values. For example, the HDT may be from 60°C to 195°C. In one embodiment, for example, the polyester composition and / or its molded article does not contain any glass fibers, and the polyester composition and / or its molded article may have an HDT of from 60°C to 90°C. In another embodiment, for example, the polyester composition and / or its molded article contains glass fibers, and the polyester composition and / or its molded article may have an HDT of from 160°C to 195°C. As used herein, the HDT is obtained by measuring its molded article with a thickness of 4.0 mm in accordance with the ISO 75:2020 test method.

[0020] Optionally, the polyester composition and / or its molded article may have a density of from 1.20 g / cm 3 to 1.45 g / cm 3 .

[0021] It should be understood that there is no particular limitation on the selection of the PBT resin as long as the polyester composition containing the PBT resin can exhibit the specific slope of the SAXS spectrum described above. The PBT resin may be a commercially available product. For example, suitable PBT resins for the present disclosure may be, but are not limited to, Longlite 1100-211L purchased from Chang Chun Plastics Co., Ltd., or Ultradur B 4500 purchased from BASF SE. Optionally, in 100 parts by weight of the entire polyester composition, the PBT resin may be present in an amount of from 30 parts by weight to 95 parts by weight, or from 50 parts by weight to 95 parts by weight, or from 30 parts by weight to 90 parts by weight, or from 35 parts by weight to 80 parts by weight, but is not limited thereto.

[0022] Optionally, the polyester composition and / or its molded article may further contain an additive resin, and the additive resin may include, but is not limited to, polybutylene adipate terephthalate resin (PBAT resin), polycarbonate resin (PC resin), polystyrene-based resin, or any combination thereof. It should be understood that there are no particular restrictions on the selection of PBAT resin, PC resin, and polystyrene-based resin as long as the polyester composition containing the additive resin can exhibit the specific slope of the SAXS spectrum described above. For example, a PBAT resin suitable for the present disclosure may be, but is not limited to, ECO-A05 purchased from Chang Chun Plastics Co., Ltd. A PC resin suitable for the present disclosure may be, but is not limited to, WONDERLITE PC-122 purchased from Chi Mei Co., Ltd. Furthermore, a polystyrene-based resin suitable for the present disclosure may be impact-resistant polystyrene resin (HIPS resin), general-purpose polystyrene resin (GPPS), or syndiotactic polystyrene resin (SPS resin). There are no particular restrictions on the type of styrene-based monomer suitable for the synthesis of the polystyrene-based resin. For example, the styrene-based monomer may be, but is not limited to, styrene, 4-methylstyrene, 3-methylstyrene, 4-chlorostyrene, 4-fluorostyrene, 4-phenylstyrene, 4-tert-butylstyrene, α-methylstyrene, or any combination thereof. For example, a HIPS resin suitable for the present disclosure may be, but is not limited to, POLYREX PH-88 purchased from Chi Mei Co., Ltd., or TAITAREX 666 purchased from Taita chemical company. A GPPS resin suitable for the present disclosure may be, but is not limited to, POLYREX GP-33 purchased from Chi Mei Co., Ltd., or TAITAREX 861N / B purchased from Taita chemical company. A SPS resin suitable for the present disclosure may be, but is not limited to, XAREC SP130 purchased from Idemitsu Kosan Co., Ltd.Optionally, in 100 parts by weight of the entire polyester composition, the additive resin may be present in an amount of 1 to 60 parts by weight, or 3 to 40 parts by weight, or 5 to 30 parts by weight, but is not limited thereto.

[0023] In one embodiment, the polyester composition and / or its molded article may further contain other raw material(s), such as an alkali metal salt, an additive, or a combination thereof. Specifically, the alkali metal may be sodium carbonate (soda), sodium bicarbonate, sodium nitrite, monosodium orthophosphate, sodium benzoate, sodium octadecenoate, sodium formate, sodium acetate, sodium phenoxide, sodium salicylate (NaC 6 H 4 (OH)CO 2 ), disodium adipate, sodium polyacrylate (ASAP), monosodium glutamate (MSG), sodium cyanate, or any combination thereof, but is not limited thereto, and the additive may include an antioxidant, a release agent, a pigment, or any combination thereof, but is not limited thereto. Optionally, in 100 parts by weight of the entire polyester composition, the alkali metal salt and / or the additive may be present in an amount of 0.1 to 10 parts by weight, or 0.1 to 5 parts by weight, or 0.2 to 3 parts by weight, but is not limited thereto. In another embodiment, the polyester composition and / or its molded article may further contain glass fiber. Specifically, the polyester composition and / or its molded article may contain a combination of an alkali metal salt and glass fiber, or a combination of an additive and glass fiber, or a combination of an alkali metal salt, an additive, and glass fiber. Optionally, in 100 parts by weight of the entire polyester composition, the glass fiber may be present in an amount of 5 to 40 parts by weight, or 10 to 30 parts by weight, but is not limited thereto.

[0024] According to the present disclosure, there are no specific restrictions on the type of thermoplastic molding method for making a molded article containing a polyester composition. Optionally, those skilled in the art can employ various thermoplastic molding methods well-known in the industry, such as injection molding, extrusion molding, blow molding, and hot press molding, but are not limited thereto.

Brief Description of the Drawings

[0025]

Figure 1

Figure 2

Embodiments for Carrying Out the Invention

[0026] To illustrate the realization of the polyester composition and its molded article of the present disclosure, a plurality of examples are provided below, and a plurality of comparative examples are provided for comparison. Those skilled in the art can easily embody the advantages and effects of the present disclosure from the following examples and comparative examples. The description proposed in this specification is exactly a preferred embodiment for illustrative purposes only and is not intended to limit the scope of the present disclosure. Various modifications and variations can be made to practice or apply the present disclosure without departing from the spirit and scope of the present disclosure.

Examples

[0027] 《Polyester Composition》 Description of the raw materials of the polyester composition 1. PBT resin: Product name: Longlite 1100-211L purchased from Chang Chun Plastics Co., Ltd. Relative density: 1.31 g / cm 3 Intrinsic viscosity (IV): 0.94 dl / g Melting point (Tm): 225 °C Melt Flow Index (MI) (@250°C / 2.16 kg): 39.5 g / 10 min. 2. PBAT resin: Product name: ECO-A05 purchased from Chang Chun Plastics Co., Ltd. Intrinsic viscosity: 1.47 dl / g Melting point: 120°C Melt Flow Index (@190°C / 2.16 kg): 5 g / 10 min. 3. PC resin: Product name: WONDERLITE PC-122 purchased from Chi Mei Co., Ltd. Relative density: 1.2 g / cm 3 Melt Flow Index (@300°C / 1.2 kg): 22 g / 10 min. 4. GPPS resin: Product name: POLYREX GP-33 purchased from Chi Mei Co., Ltd. Relative density: 1.04 g / cm 3 Melt Flow Index (@200°C / 5 kg): 8.0 ml / 10 min. 5. HIPS resin: Product name: POLYREX PH-88 purchased from Chi Mei Co., Ltd. Relative density: 1.03 g / cm 3 ; Melt Flow Index (@200°C / 5 kg): 5.5 ml / 10 min. 6. Glass fiber: Product name: T-187H purchased from Japan Nippon Electric Glass Co., Ltd. 7. Antioxidant: Product name: ADK STAB A-611 purchased from Chang Chun Petrochemical Co., Ltd. 8. Release agent: Product name: WAX EB-P purchased from Kao Oleochemical 9. It is a masterbatch for laser welding materials: Product name: eBIND LTW-8904 purchased from Orient Chemical.

[0028] Example 1: Polyester composition 79.40 parts by weight of PBT resin, 20.00 parts by weight of GPPS resin, 0.20 parts by weight of sodium carbonate, 0.20 parts by weight of antioxidant and 0.20 parts by weight of release agent were fed into a screw extruder in a quantitative feeding manner through a gravimetric feeder, and the above raw materials were thoroughly mixed. The mixture was melt-kneaded, extruded from the screw extruder at 260 °C and cut into pellets to obtain the final product of the polyester composition of Example 1, and its relative density was about 1.256 g / cm 3 It was. The description of each raw material in the polyester composition was as above.

[0029] Example 2: Polyester composition 74.10 parts by weight of PBT resin, 25.00 parts by weight of GPPS resin, 0.50 parts by weight of sodium carbonate, 0.20 parts by weight of antioxidant and 0.20 parts by weight of release agent were fed into a screw extruder in a quantitative feeding manner through a gravimetric feeder, and the above raw materials were thoroughly mixed. The mixture was melt-kneaded, extruded from the screw extruder at 260 °C and cut into pellets to obtain the final product of the polyester composition of Example 2, and its relative density was about 1.239 g / cm 3 It was. The description of each raw material in the polyester composition was as above.

[0030] Example 3: Polyester composition 89.10 parts by weight of PBT resin, 10.00 parts by weight of GPPS resin, 0.50 parts by weight of sodium carbonate, 0.20 parts by weight of antioxidant and 0.20 parts by weight of release agent were fed into a screw extruder in a quantitative feeding manner through a gravimetric feeder, and the above raw materials were thoroughly mixed. The mixture was melt-kneaded, extruded from the screw extruder at 260 °C and cut into pellets to obtain the final product of the polyester composition of Example 3, and its relative density was about 1.293 g / cm 3It was. The description of each raw material in the polyester composition was as described above.

[0031] Example 4: Polyester Composition 94.10 parts by weight of PBT resin, 5.00 parts by weight of GPPS resin, 0.50 parts by weight of sodium nitrite, 0.20 parts by weight of antioxidant and 0.20 parts by weight of release agent were fed into a screw extruder in a quantitative feeding manner via a gravimetric feeder, and the above raw materials were sufficiently mixed. The mixture was melt-kneaded, extruded from the screw extruder at 260 °C and cut into pellets to obtain the final product of the polyester composition of Example 4, and its relative density was about 1.302 g / cm 3 It was. The description of each raw material in the polyester composition was as described above.

[0032] Example 5: Polyester Composition 69.10 parts by weight of PBT resin, 5.00 parts by weight of PBAT resin, 25.00 parts by weight of PC resin, 0.50 parts by weight of sodium dihydrogen phosphate, 0.20 parts by weight of antioxidant and 0.20 parts by weight of release agent were fed into a screw extruder in a quantitative feeding manner via a gravimetric feeder, and the above raw materials were sufficiently mixed. The mixture was melt-kneaded, extruded from the screw extruder at 260 °C and cut into pellets to obtain the final product of the polyester composition of Example 5, and its relative density was about 1.277 g / cm 3 It was. The description of each raw material in the polyester composition was as described above.

[0033] Example 6: Polyester Composition 79.10 parts by weight of PBT resin, 10.00 parts by weight of GPPS resin, 0.50 parts by weight of sodium carbonate, 10.00 parts by weight of glass fiber, 0.20 parts by weight of antioxidant and 0.20 parts by weight of release agent were fed into a screw extruder in a quantitative feeding manner via a gravimetric feeder, and the above raw materials were sufficiently mixed. The mixture was melt-kneaded, extruded from the screw extruder at 260 °C and cut into pellets to obtain the final product of the polyester composition of Example 6, and its relative density was about 1.345 g / cm 3It was. The description of each raw material in the polyester composition was as described above.

[0034] Example 7: Polyester Composition 58.60 parts by weight of PBT resin, 20.00 parts by weight of GPPS resin, 1.00 part by weight of sodium hydrogen carbonate, 20.00 parts by weight of glass fiber, 0.20 part by weight of antioxidant, and 0.20 part by weight of release agent were supplied into a screw extruder in a quantitative supply manner via a gravimetric feeder, and the above raw materials were sufficiently mixed. The mixture was melt-kneaded, extruded from the screw extruder at 260 °C, and cut into pellets to obtain the final product of the polyester composition of Example 7, and its relative density was about 1.375 g / cm 3 It was. The description of each raw material in the polyester composition was as described above.

[0035] Example 8: Polyester Composition 38.10 parts by weight of PBT resin, 30.00 parts by weight of GPPS resin, 0.50 part by weight of sodium benzoate, 30.00 parts by weight of glass fiber, 0.20 part by weight of antioxidant, 0.20 part by weight of release agent, and 1.00 part by weight of masterbatch of laser welding material were supplied into a screw extruder in a quantitative supply manner via a gravimetric feeder, and the above raw materials were sufficiently mixed. The mixture was melt-kneaded, extruded from the screw extruder, and extruded from the screw extruder at 260 °C and cut into pellets to obtain the final product of the polyester composition of Example 8, and its relative density was about 1.402 g / cm 3 It was. The description of each raw material in the polyester composition was as described above.

[0036] Example 9: Polyester Composition 47.85 parts by weight of PBT resin, 20.00 parts by weight of GPPS resin, 0.25 parts by weight of sodium carbonate, 30.00 parts by weight of glass fiber, 0.20 parts by weight of antioxidant, 0.20 parts by weight of release agent and 1.50 parts by weight of masterbatch of laser welding material were fed into a screw extruder in a quantitative feeding manner through a gravimetric feeder, and the above raw materials were sufficiently mixed. The mixture was melt-kneaded, extruded from the screw extruder at 260 °C, cut into pellets, and the final product of the polyester composition of Example 9 was obtained. Its relative density was about 1.443 g / cm 3 It was. The description of each raw material in the polyester composition was as described above.

[0037] Comparative Example 1: Polyester Composition 99.60 parts by weight of PBT resin, 0.20 parts by weight of antioxidant and 0.20 parts by weight of release agent were fed into a screw extruder in a quantitative feeding manner through a gravimetric feeder, and the above raw materials were sufficiently mixed. The mixture was melt-kneaded, extruded from the screw extruder at 260 °C, cut into pellets, and the final product of the polyester composition of Comparative Example 1 was obtained. Its relative density was about 1.304 g / cm 3 It was. The description of each raw material in the polyester composition was as described above.

[0038] Comparative Example 2: Polyester Composition 89.60 parts by weight of PBT resin, 5.00 parts by weight of HIPS resin, 5.0 parts by weight of sodium octadecanoate, 0.20 parts by weight of antioxidant and 0.20 parts by weight of release agent were fed into a screw extruder in a quantitative feeding manner through a gravimetric feeder, and the above raw materials were sufficiently mixed. The mixture was melt-kneaded, extruded from the screw extruder at 260 °C, cut into pellets, and the final product of the polyester composition of Comparative Example 2 was obtained. Its relative density was about 1.278 g / cm 3 It was. The description of each raw material in the polyester composition was as described above.

[0039] Comparative Example 3: Polyester Composition 59.60 parts by weight of PBT resin, 10.00 parts by weight of GPPS resin, 30.00 parts by weight of glass fiber, 0.20 parts by weight of antioxidant and 0.20 parts by weight of release agent were fed into a screw extruder in a metering feeding manner via a gravimetric feeder, and the above raw materials were thoroughly mixed. The mixture was melt-kneaded and extruded from the screw extruder at 260 °C and cut into pellets to obtain the final product of the polyester composition of Comparative Example 3, and its relative density was about 1.479 g / cm 3 It was. The description of each raw material in the polyester composition was as described above.

[0040] It should be understood that, apart from the method employed in the above embodiments, there are no specific restrictions on the type of device used for mixing the above raw materials. That is, in addition to the screw extruder illustrated above, other mixing devices for uniformly mixing raw materials, such as Brabender mixers and Banbury mixers, may be employed by those skilled in the art.

[0041] Also, those skilled in the art can mix a plurality of raw materials and obtain a mixture in advance if necessary, and then supply the mixture into a mixing device, followed by a melting and kneading process at an appropriate temperature. Finally, the polyester composition can be extruded, followed by a cooling step and a granulation step (cutting into pellets) by a pelletizer. Optionally, the temperature of the melting and kneading process may be, but is not limited to, from 220 °C to 300 °C.

[0042] 《Molded Articles》 Examples 1A to 9A and Comparative Examples 1A to 3A The molded articles of Examples 1A to 9A and Comparative Examples 1A to 3A were each made of the above-mentioned polyester compositions of Examples 1 to 9 and Comparative Examples 1 to 3 by the same molding method described below.

[0043] Specifically, an injection molding machine (manufacturer: Victor Taichung Machinery Works Co., Ltd., model: VS-100K) was employed to inject the polyester composition into molded articles of a specific thickness. The molding temperature was approximately 70°C, and the injection temperature was approximately 265°C. Each of the molded articles in the examples and comparative examples was manufactured under the same injection molding conditions, except for the polyester composition used as the raw material.

[0044] In addition to the method employed in the above-described examples, it should be understood that there are no specific restrictions on the type of molding method. That is, those skilled in the art may employ various well-known thermoplastic molding methods to make molded articles from the polyester composition. For example, in addition to injection molding, extrusion molding, blow molding, or hot press molding may be employed. Optionally, the molding temperature of the aforementioned injection molding machine may be set from 40°C to 70°C, and the injection temperature of the aforementioned injection molding machine may be set from 240°C to 280°C. The setting should not be limited to the above-mentioned temperatures in the embodiments.

[0045] Test Example 1: Small-Angle X-ray Scattering (SAXS) The polyester compositions of Examples 1 to 9 and Comparative Examples 1 to 3 were used as test samples.

[0046] First, each of the polyester compositions was injected to form test samples with a thickness of approximately 2.0 mm. Then, each of the aforementioned test samples was horizontally placed on the jig stage of a small-angle scattering system (manufacturer: Bruker Corporation, model: N8 Horizon). Next, the incident beam was transmitted through the test sample with a thickness of approximately 2.0 mm, and scattering by the particles occurred. Then, a detector was used to receive the signal of the aforementioned scattering, and the intensity of the X-rays scattered by the test sample was measured as a function of the scattering angle (2θ) ranging from 0° to 5°. Furthermore, the SAXS data was analyzed, with the vertical axis representing the scattering intensity (unit: arbitrary unit (a.u.)) and the horizontal axis representing the scattering vector (unit: nm -1To obtain the SAXS spectrum representing and analyze the changes in the nanostructure pattern, software (DIFFRAC.SAXS software suite) was installed in the small-angle scattering system. Here, the light source of the incident beam: Cu Kα radiation, and its wavelength was approximately 1.54 Å. The distance between the incident beam and the test sample was 58 centimeters (cm), the distance between the test sample and the detector was 0.6 meters (m), and the exposure time was 1200 seconds (sec). Before testing the test sample, background correction was performed on the sample holder with the atmosphere and glassy carbon to reduce the signal noise from the background.

[0047] In each of the SAXS spectra of the examples and comparative examples, within the scattering vector ranging from 0.15 nm -1 to 0.20 nm -1 the slope of the plot (hereinafter referred to as the "SAXS slope") was analyzed, and the results were summarized in Tables 1 and 2.

[0048] In the polyester composition, individual particles smaller than 100 nanometers (nm) in size, or two or more incompatible resins, cause scattering due to the non-uniform structure, and the scattering intensity corresponds to the low scattering vector (small-angle position) and may be high in the SAXS spectrum.

[0049] In the group of polyester compositions without glass fibers, the SAXS spectra of Example 2 and Comparative Example 1 were obtained as examples, and the comparison between them is shown in Fig. 1. The SAXS spectrum of Example 2 presented by the dotted line had a clear negative slope (i.e., a downward trend) within the scattering vector ranging from 0.15 nm -1 to 0.20 nm -1 . In contrast, the SAXS spectrum of Comparative Example 1 presented by the solid line showed a slightly upward trend (i.e., a positive slope) within the scattering vector ranging from 0.15 nm -1 to 0.20 nm -1 .

[0050] In the group of polyester compositions containing glass fibers, the SAXS spectra of Example 6 and Comparative Example 3 were obtained as in the examples, and the comparison between them is shown in Figure 2. Similarly, the SAXS spectrum of Example 6 presented by the dotted line had a clear negative slope (i.e., a downward trend) within the scattering vector ranging from 0.15 nm -1 to 0.20 nm -1 . In contrast, the SAXS spectrum of Comparative Example 3 presented by the solid line was almost flat and in close contact with the X-axis within the scattering vector ranging from 0.15 nm -1 to 0.20 nm -1 (even from the scattering vector exceeding 0 nm -1 to 1.0 nm -1 ).

[0051] Table 1: SAXS slopes (@0.15 nm -1 to 0.20 nm -1 ), total transmittance (@1064 nm), Dk (@40 GHz) and Df (@40 GHz) of the polyester compositions of Examples 1 to 5 (E1 to E5) and Comparative Examples 1 and 2 (C1 to C2)

Table 1

[0052] Table 2: SAXS slopes (@0.15 nm -1 to 0.20 nm -1 ), total transmittance (@1064 nm), Dk (@40 GHz) and Df (@40 GHz) of the polyester compositions of Examples 6 to 9 (E6 to E9) and Comparative Example 3 (C3)

Table 2

[0053] As shown in Table 1 and Table 2, the SAXS slopes of the polyester compositions of Examples 1 to 9 fell within the range of -2.00 to -4.20, indicating that the polyester compositions of Examples 1 to 9 actually had individual nanostructures. On the other hand, all of the SAXS slopes of the polyester compositions of Comparative Examples 1 to 3 were outside the range of -2.00 to -4.20, that is, their SAXS slopes exceeded -2.00, indicating that the polyester compositions of Comparative Examples 1 to 3 clearly did not have individual nanostructures. It was found that the nanostructures of the polyester compositions of Examples 1 to 9 were different from those of the polyester compositions of Comparative Examples 1 to 3, because their SAXS slopes were significantly different within the scattering vector of -1 from 0.15 nm -1 to 0.20 nm in the SAXS spectrum.

[0054] Test Example 2: Total transmittance The polyester compositions of Examples 1 to 9 and Comparative Examples 1 to 3 were injection molded, respectively, to obtain molded products with a thickness of about 2.0 mm as test samples for this test.

[0055] Using a UV / Vis / NIR spectrometer (model: LAMBDA 1050 manufactured by PerkinElmer) equipped with a 150-mm integrating sphere, the total transmittance of the test samples was measured with near-infrared light at a wavelength of 1064 nm, respectively, and the results were listed in Table 1 and Table 2. The higher the total transmittance of the molded product, the better the transmission of the laser light.

[0056] As shown in Tables 1 and 2, all of the molded products made from the polyester compositions of Examples 1 to 9 had a higher total transmittance in near-infrared light than those made from the polyester compositions of Comparative Examples 1 to 3. Therefore, the polyester compositions of Examples 1 to 9 are suitable for laser welding, and as a result, it was shown that their molded products can be more suitable for automotive electronic parts or 5G information communication bodies.

[0057] As shown in Tables 1 and 2, all of the molded articles made from the polyester compositions of Examples 1 to 9 were able to have a total transmittance of 33% to 70% in near-infrared light, while all of the molded articles made from the polyester compositions of Comparative Examples 1 to 3 did not reach 33%. Therefore, it was shown that the polyester compositions of Comparative Examples 1 to 3 are not suitable for laser welding and are also not suitable for automotive electronic parts or 5G information communication bodies.

[0058] Test Example 3: Dielectric Properties The polyester compositions of Examples 1 to 9 and Comparative Examples 1 to 3 were injection molded respectively to obtain molded articles with a thickness of about 0.2 mm, which were used as test samples for this test.

[0059] Using a TE mode cavity resonator (manufactured by AET, INC.) and a vector network analyzer (VNA) (model: MS46122B, manufactured by ANRITSU), the dielectric constant (Dk) and dissipation factor (Df) of each test sample were measured at 40 GHz according to IPC-TM650 2.5.5.13, and the results were listed in Tables 1 and 2. The lower the Dk and / or Df of the molded article, the better the ability to suppress electromagnetic wave energy loss and the less the electromagnetic wave transmission loss.

[0060] As shown in Table 1, from the comparison of the dielectric properties of the polyester compositions of Examples 1 to 5 with those of the polyester compositions of Comparative Examples 1 to 2 (without glass fiber), it was found that all of the Dk values of the polyester compositions of Examples 1 to 5 at 40 GHz were lower than the Dk value of the polyester composition of Comparative Example 1 at 40 GHz. Furthermore, all of the Df values of the polyester compositions of Examples 1 to 5 at 40 GHz were not higher than but rather lower than the Df value of the polyester composition of Comparative Example 1 at 40 GHz. Regarding the polyester composition of Comparative Example 2, a sheet with a thickness of about 0.2 mm could not be made by injection molding, so the dielectric properties could not be analyzed.

[0061] Furthermore, as shown in Table 2, from the comparison of the dielectric properties of the polyester compositions of Examples 6 to 9 with those of the polyester composition of Comparative Example 3 (containing glass fiber), it was found that all of the Dk and Df of the polyester compositions of Examples 6 to 9 at 40 GHz were lower than those of the polyester composition of Comparative Example 3 at 40 GHz.

[0062] As a result, from the results in Tables 1 and 2, compared with Comparative Examples 1 to 3, the polyester compositions of Examples 1 to 9 are more beneficial in suppressing electromagnetic wave energy loss, and as a result, the molded articles thereof can be suitably used for automotive electronic components or 5G information communication bodies.

[0063] From Tables 1 and 2, a polyester composition not containing glass fiber can have a Dk of 2.66 or less at 40 GHz and a Df of 0.007 or less at 40 GHz. On the other hand, a polyester composition containing glass fiber can have a Dk of 3.00 or less at 40 GHz and a Df of 0.008 or less at 40 GHz.

[0064] Test Example 4: Mechanical Properties The polyester compositions of Examples 1 to 9 and Comparative Examples 1 to 3 were injection molded respectively to obtain molded articles with a thickness of about 4.0 mm (i.e., Examples 1A to 9A and Comparative Examples 1A to 3A), which were used as ISO multi-functional test samples for this test.

[0065] Using a universal testing machine (Model: Z010 manufactured by Zwick / Roell Pte. Ltd.), the tensile modulus of the aforementioned ISO multi-functional test samples was measured at 23 °C according to the ISO 527:2019 standard method, and the results were listed in Tables 3 and 4. Also, using a universal testing machine (Model: Z005 manufactured by Zwick / Roell Pte. Ltd.), the flexural modulus of the aforementioned ISO multi-functional test samples was measured at 23 °C according to the ISO 178:2019 standard method, and the results were listed in Tables 3 and 4. The higher the tensile modulus and flexural modulus of the molded article, the better the tensile elasticity and flexural rigidity.

[0066] As shown in Table 3, it can be seen that the tensile elastic modulus and flexural elastic modulus of the molded articles of Examples 1A to 5A are all higher than those of the molded articles of Comparative Examples 1A and 2A, and it was shown that the molded articles of Examples 1A to 5A have better tensile elasticity and flexural rigidity than those of the molded articles of Comparative Examples 1A and 2A. Specifically, the tensile elastic modulus of the molded articles of Examples 1A to 5A can be 2600 MPa or more, and the flexural elastic modulus of the molded articles of Examples 1A to 5A could be 2300 MPa or more.

[0067] As shown in Table 4, the tensile elastic modulus of the molded articles of Examples 6A to 9A can be 5000 MPa or more, and the flexural elastic modulus of the molded articles of Examples 6A to 9A could be 4000 MPa or more. The tensile elastic modulus of the molded articles of Examples 8A and 9A can be 10000 MPa or more, and the flexural elastic modulus of the molded articles of Examples 8A and 9A could be 8000 MPa or more. Furthermore, it was found that the tensile elastic modulus and flexural elastic modulus of the molded articles of Examples 8A and 9A were higher than those of the molded articles of Comparative Example 3A, indicating that the molded articles of Examples 8A and 9A have better tensile elasticity and flexural rigidity than those of the molded articles of Comparative Example 3A.

[0068] Table 3: Tensile elastic modulus, flexural elastic modulus and heat distortion temperature of molded articles of Examples 1A to 5A (E1A to E5A) and Comparative Examples 1A and 2A (C1A and C2A) [Table 3]

[0069] Table 4: Tensile elastic modulus, flexural elastic modulus and heat distortion temperature of molded articles of Examples 6A to 9A (E6A to E9A) and Comparative Example 3A (C3A) [Table 4]

[0070] Test Example 5: Heat distortion temperature For the test, the above-described ISO multi-functional test specimens of Test Example 4 (thickness of approximately 4.0 mm) were adopted, and an HDT tester (Model: 6M-2, Manufacturer: Toyo Seiki Seisaku-sho, Ltd.) was used in accordance with the ISO 75:2020 standard method. Specifically, a load of 1.8 MPa was applied to the ISO multi-functional test specimen, and the ISO multi-functional test specimen was heated from 23°C at a heating rate of 120°C / hour until the deformation of the test specimen reached 0.34 mm. During the heating period, the deflection temperature of the ISO multi-functional test specimen was measured respectively and recorded as the heat distortion temperature, and the results are listed in Tables 3 and 4.

[0071] From the results in Tables 3 and 4, it was shown that the HDT of the molded products of Examples 1A to 9A could range from 60°C to 195°C, and the molded products of Examples 1A to 9A could have desirable heat resistance. Specifically, the HDT of the molded products of Examples 1A to 5A could range from 60°C to 90°C, and the HDT of the molded products of Examples 6A to 9A could range from 160°C to 195°C. It was found that the molded products containing glass fiber could exhibit better heat resistance.

[0072] Discussion on experimental results Based on the results of Test Examples 1 to 3, the SAXS slopes of the polyester compositions of Examples 1 to 9 fall within a specific range of -2.00 to -4.20. Since each of the polyester compositions of Examples 1 to 9 has a desirable individual nanostructure, it means that the molded article thereof can have a total transmittance of 33% to 70% with near-infrared light and good dielectric properties (i.e., lower Dk and / or lower Df). In contrast, the SAXS slopes of the polyester compositions of Comparative Examples 1 to 3 do not fall within the aforementioned specific range, which means that since the polyester compositions of Comparative Examples 1 to 3 do not have significantly individual nanostructures, the molded articles thereof had a lower total transmittance with near-infrared light and lower dielectric properties. Compared with Comparative Examples 1 to 3, it was proven that the polyester compositions of Examples 1 to 9 and / or their molded articles can have the advantages of high laser transmittance and low electromagnetic wave transmission loss. Therefore, the polyester compositions and / or their molded articles of the present disclosure can be particularly suitable for products in the vehicle, information transmission, aerospace, and medical industries.

[0073] Furthermore, with further reference to the results of Test Examples 4 and 5, the polyester compositions of Examples 1 to 9 and / or their molded articles were able to have a certain tensile modulus, flexural modulus, and heat distortion temperature. It was shown that the polyester compositions of Examples 1 to 9 and / or their molded articles can maintain tensile elasticity, flexural rigidity, and heat resistance simultaneously in addition to having the advantages of high laser light transmission and low electromagnetic wave transmission loss.

[0074] In summary, since both the polyester compositions and / or their molded articles of the present disclosure exhibit high laser transmittance and low electromagnetic wave transmission loss, the polyester compositions and / or their molded articles of the present disclosure can contribute to the use of laser welding and the expansion of design adaptability. Therefore, while meeting the requirements of next-generation high-frequency communication, the value of laser-welded plastic joint products can be improved.

[0075] Although many features and advantages of the present disclosure are set forth in the foregoing description together with details of the structure and characteristics of the present disclosure, the present disclosure is merely illustrative. Changes may be made in detail, especially as to the shape, size and arrangement of the parts, within the principles of the present disclosure to the fullest extent indicated by the broad general meaning of the terms used in the appended claims.

Claims

1. A polyester composition comprising a polybutylene terephthalate resin, which is analyzed by small angle X-ray scattering (SAXS) to obtain a spectrum in which the vertical axis represents the scattering intensity and the horizontal axis represents the scattering vector, and the spectrum has a mean scattering intensity of 0.15 nm and a mean scattering vector of 0.25 nm. －１ From 0.20 nm －１ within the scattering vector ranging from -2.00 to -4.20, the SAXS spectrum of the polyester composition has a slope ranging from -2.00 to -4.

20.

2. 0.15 nm －１ From 0.20 nm －１ 2. The polyester composition of claim 1, wherein within the scattering vector ranging from -3.00 to -4.20, the slope of the SAXS spectrum ranges from -3.00 to -4.

20.

3. 10. The polyester composition of claim 1 comprising a polybutylene adipate terephthalate resin, a polycarbonate resin, a polystyrene-based resin, or any combination thereof.

4. 4. The polyester composition of claim 3, comprising an alkali metal salt, an additive, or a combination thereof, wherein the additive comprises an antioxidant, a release agent, a pigment, or any combination thereof.

5. The polyester composition of claim 1 , further comprising glass fibers.

6. 5. The polyester composition of claim 1, having a dissipation factor (Df) of less than or equal to 0.007 at a frequency of 40 gigahertz (GHz).

7. 6. The polyester composition of claim 5 having a Df of less than 0.008 at a frequency of 40 GHz.

8. 5. The polyester composition of claim 1 having a dielectric constant (Dk) of less than or equal to 2.66 at a frequency of 40 GHz.

9. 6. The polyester composition of claim 5 having a Dk of 3.00 or less at a frequency of 40 GHz.

10. 5. The polyester composition of claim 1, wherein the SAXS spectrum is obtained by analyzing a 2.0 millimeter thick molded part made from the polyester composition employing a small angle scattering system, the small angle scattering system being available from Bruker N8 HORIZON.

11. A molded article produced from a raw material comprising the polyester composition according to any one of claims 1 to 4.

12. The molded article according to claim 11, having a tensile modulus of 2600 MPa or more.

13. The molded article according to claim 11, having a flexural modulus of 2300 MPa or more.

14. 12. The molded article of claim 11, wherein the polyester composition is included in the molded article that includes glass fibers.

15. 12. The molded article of claim 11 having a total transmittance ranging from 33% to 70% in the near infrared spectrum at a wavelength of 1064 nm.

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