Liquid Crystal Polyester Resin

Abstract

To provide a liquid crystal polyester resin which is excellent in mechanical strength, achieves a low dielectric constant of the resin itself, and is excellent in dielectric characteristics.SOLUTION: A liquid crystal polyester resin contains a repeating unit represented by formulae (I) to (V), (wherein, Ar1 and Ar2 each represent one or two or more divalent aromatic groups; p, q, r, s and t each represent a composition ratio (mol%) of each repeating unit in the liquid crystal polyester resin, and satisfy the following conditions: 0.01≤p≤7, 15≤q≤40, 60≤r≤85, 0≤s≤7 and 0≤t≤7, wherein s and t are not simultaneously 0).SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a liquid crystal polyester resin having excellent mechanical strength and dielectric properties. [Background technology]

[0002] Thermotropic liquid crystal polyester resin (hereinafter referred to as liquid crystal polyester resin or LCP) is used in parts in a wide variety of fields due to its excellent mechanical properties, moldability, chemical resistance, gas barrier properties, moisture resistance, electrical properties, etc. In particular, its use in electronic parts is expanding due to its excellent heat resistance, thin-wall moldability, and insulation properties.

[0003] In recent years, with the development of an advanced information society, the amount of information transmitted and the transmission speed of information and communication devices such as personal computers and mobile phones have increased explosively in the information and communication field. In particular, there is an increasing need for high-performance high-frequency electronic components that can be used in the microwave and millimeter wave high-frequency ranges.

[0004] However, when a liquid crystalline polyester resin with a high dielectric constant is used as a substrate for, for example, an electrical connector, problems arise such as attenuation of high frequency signals and a decrease in signal propagation speed, so liquid crystalline polyester resins used in these electronic components are required to have a low dielectric constant.

[0005] In order to reduce the dielectric constant of a liquid crystal polyester resin, a liquid crystal polyester resin composition containing a fibrous filler having an aspect ratio of 4 or more and inorganic hollow spheres having a specific particle size has been proposed (Patent Document 1). [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2004-143270 Summary of the Invention [Problem to be solved by the invention]

[0007] However, the liquid crystal polyester resin composition has problems such as the inorganic hollow spheres being damaged or not being uniformly dispersed in the liquid crystal polyester resin during molding processing, resulting in a deterioration in the physical properties of the composition or the occurrence of unevenness in the physical properties.

[0008] Therefore, there has been a demand for a liquid crystal polyester resin that does not deteriorate the physical properties of the liquid crystal polyester resin, and that has a low dielectric constant and excellent dielectric properties.

[0009] An object of the present invention is to provide a liquid crystal polyester resin which is excellent in mechanical strength and dielectric properties, in which the resin itself has a low dielectric constant. [Means for solving the problem]

[0010] As a result of extensive research, the inventors have discovered that by using specific repeating units as constituent components, a liquid crystal polyester resin having good mechanical strength and excellent dielectric properties in the high frequency band can be obtained, and have thus completed the present invention.

[0011] That is, the present invention includes the following preferred embodiments. [1] Formulas (I)~(V) [ka] [In the formula, Ar1 and Ar2 each represent one or more divalent aromatic groups, and p, q, r, s, and t each represent the composition ratio (mol %) of each repeating unit in the liquid crystal polyester resin, and satisfy the following condition: 0.01≦p≦7, 15≦q≦40, 60≦r≦85, 0≦s≦7, 0≦t≦7, However, s and t cannot be 0 at the same time. A liquid crystal polyester resin containing a repeating unit represented by the formula: [2] Ar1 and Ar2 are each independently represented by the formulas (1) to (4). [ka] The liquid crystal polyester resin according to [1], wherein the aromatic group is one or more selected from the group consisting of aromatic groups represented by the following formula: [3] The liquid crystal polyester resin according to [1] or [2], which has a dielectric constant of 3.65 or less when measured at 10 GHz using a test piece of 85 mm x 1.7 mm x 1.7 mm by a cavity resonator perturbation method in accordance with JIS C2565. [4] The liquid crystal polyester resin according to any one of [1] to [3], which has an Izod impact strength of 270 J / m or more. [5] A liquid crystal polyester resin composition comprising the liquid crystal polyester resin according to any one of [1] to [4] and an inorganic filler and / or an organic filler. [6] The liquid crystal polyester resin composition according to [5], wherein the inorganic filler and / or the organic filler is at least one selected from the group consisting of glass fiber, silica alumina fiber, alumina fiber, carbon fiber, potassium titanate fiber, aluminum borate fiber, aramid fiber, talc, mica, graphite, wollastonite, dolomite, clay, glass flakes, glass beads, glass balloons, calcium carbonate, barium sulfate, and titanium oxide. [7] A molded article or film made from the liquid crystal polyester resin according to any one of [1] to [4] or the liquid crystal polyester resin composition according to any one of [5] to [6]. [Effects of the Invention]

[0012] The liquid crystal polyester resin of the present invention has good mechanical strength and excellent dielectric properties in the high frequency band, and therefore can be suitably used as a material for thin-layered, highly integrated electrical and electronic components such as connectors, antennas and printed wiring boards. DETAILED DESCRIPTION OF THE INVENTION

[0013] The liquid crystal polyester resin of the present invention is a liquid crystal polyester resin that forms an anisotropic melt phase, which is called a thermotropic liquid crystal polyester resin by those skilled in the art.

[0014] The properties of the anisotropic molten phase of the liquid crystal polyester resin can be confirmed by a conventional polarized light inspection method using cross polarizers, that is, by observing a sample placed on a hot stage under a nitrogen atmosphere.

[0015] The liquid crystal polyester resin of the present invention is a liquid crystal polyester represented by the formulas (I) to (V) [ka] [In the formula, Ar1 and Ar2 each represent one or more divalent aromatic groups, and p, q, r, s, and t each represent the composition ratio (mol %) of each repeating unit in the liquid crystal polyester resin, and satisfy the following condition: 0.01≦p≦7, 15≦q≦40, 60≦r≦85, 0≦s≦7, 0≦t≦7, However, s and t cannot be 0 at the same time. It contains a repeating unit represented by the formula:

[0016] The composition ratio p in formula (I) is 0.01 to 7, preferably 0.05 to 6 mol %, more preferably 0.1 to 5 mol %, further preferably 0.2 to 4 mol %, and particularly preferably 0.3 to 3.5 mol %.

[0017] If the repeating unit represented by formula (I) is less than 0.01 mol %, it is difficult to obtain an improvement effect on the dielectric properties, and if it exceeds 7 mol %, the mechanical strength is likely to decrease.

[0018] Specific examples of monomers that provide the repeating unit represented by formula (I) include 3-hydroxybenzoic acid and its ester-forming derivatives such as acylates, ester derivatives and acid halides.

[0019] The composition ratio q in formula (II) is 15 to 40, preferably 18 to 36 mol %, more preferably 20 to 34 mol %, further preferably 21 to 32 mol %, and particularly preferably 22 to 30 mol %.

[0020] Specific examples of monomers that provide the repeating unit represented by formula (II) include 4-hydroxybenzoic acid and its ester-forming derivatives such as acylates, ester derivatives and acid halides.

[0021] The composition ratio r in formula (III) is 60 to 85, preferably 64 to 82 mol %, more preferably 66 to 80 mol %, further preferably 68 to 79 mol %, and particularly preferably 70 to 78 mol %.

[0022] Specific examples of the monomer that provides the repeating unit represented by formula (III) include 6-hydroxy-2-naphthoic acid and its ester-forming derivatives such as acylates, ester derivatives and acid halides.

[0023] The composition ratio s of formula (IV) and the composition ratio t of formula (V) are each 0 to 7 mol%, preferably 0.01 to 6 mol%, more preferably 0.1 to 5 mol%, and even more preferably 0.3 to 4 mol%. However, s and t are not simultaneously 0. s + t is preferably 0.01 to 9 mol%, more preferably 0.05 to 7 mol%, more preferably 0.1 to 5 mol%, and even more preferably 0.2 to 4 mol%.

[0024] In the above repeating unit, for example, when Ar1 (or Ar2) represents two or more divalent aromatic groups, it means that the liquid crystal polyester resin contains two or more repeating units represented by formula (IV) (or (V)) according to the type of divalent aromatic group. In this case, the composition ratio s according to formula (IV) (or the composition ratio t according to formula (V)) represents the total composition ratio of the two or more repeating units.

[0025] Specific examples of monomers that provide the repeating unit represented by formula (IV) include hydroquinone, resorcinol, 2,6-dihydroxynaphthalene, 2,7-dihydroxynaphthalene, 1,6-dihydroxynaphthalene, 1,4-dihydroxynaphthalene, 4,4'-dihydroxybiphenyl, 3,3'-dihydroxybiphenyl, 3,4'-dihydroxybiphenyl, 4,4'-dihydroxybiphenyl ether, and ester-forming derivatives thereof, such as alkyl-, alkoxy-, or halogen-substituted products, and acylated products of these.

[0026] Specific examples of monomers that provide the repeating unit represented by formula (V) include terephthalic acid, isophthalic acid, 2,6-naphthalenedicarboxylic acid, 1,6-naphthalenedicarboxylic acid, 2,7-naphthalenedicarboxylic acid, 1,4-naphthalenedicarboxylic acid, 4,4'-dicarboxybiphenyl, and the like, as well as alkyl-, alkoxy-, or halogen-substituted derivatives thereof, and ester-forming derivatives thereof, such as ester derivatives and acid halides.

[0027] Among these, a liquid crystal polyester resin in which Ar1 and Ar2 in the repeating units represented by formula (IV) and formula (V) each independently contain one or more aromatic groups selected from the group consisting of aromatic groups represented by formulas (1) to (4) is preferred. [ka]

[0028] Among these, as Ar1 relating to the repeating unit represented by formula (IV), aromatic groups represented by formula (1) or formula (3) are more preferred because they make it easier to adjust the mechanical strength and dielectric properties of the resulting liquid crystal polyester to the desired levels.

[0029] Monomers that provide these repeating units include hydroquinone and 4,4'-dihydroxybiphenyl, and ester-forming derivatives thereof.

[0030] Furthermore, as Ar2 in the repeating unit represented by formula (V), an aromatic group represented by formula (1), formula (2) or formula (4) is more preferred because it makes it easier to adjust the mechanical strength and dielectric properties of the resulting liquid crystal polyester to the desired levels.

[0031] Monomers which provide these repeating units include terephthalic acid, isophthalic acid and 2,6-naphthalenedicarboxylic acid, and ester-forming derivatives thereof.

[0032] The total composition ratio of the repeating units in the liquid crystal polyester resin of the present invention [p+q+r+s+t] is preferably 100 mol %, but other repeating units may also be contained within a range that does not impair the objective of the present invention.

[0033] Examples of monomers that provide other repeating units include other aromatic hydroxycarboxylic acids, other aromatic diols, other aromatic dicarboxylic acids, aromatic hydroxyamines, aromatic diamines, aromatic aminocarboxylic acids, aromatic hydroxydicarboxylic acids, aliphatic diols, aliphatic dicarboxylic acids, aromatic mercaptocarboxylic acids, aromatic dithiols, aromatic mercaptophenols, and combinations thereof.

[0034] The total composition ratio of repeating units provided by these other monomer components is preferably 10 mol % or less based on the total repeating units.

[0035] The method for producing the liquid crystal polyester resin of the present invention will be described below. The method for producing the liquid crystal polyester resin of the present invention is not particularly limited, and any known polycondensation method for forming an ester bond with the above-mentioned monomer components, such as a melt acidolysis method or a slurry polymerization method, can be used.

[0036] The melt acidolysis method is a suitable method for producing the liquid crystalline polyester resin of the present invention, in which the monomers are first heated to form a melt of reactants, and the reaction is continued to obtain a molten polyester. A vacuum may be applied to facilitate removal of volatile by-products (e.g., acetic acid, water, etc.) produced in the final stage of condensation.

[0037] Slurry polymerization is a process in which the reaction is carried out in the presence of a heat exchange fluid, and the solid product is obtained in a state suspended in the heat exchange medium.

[0038] In both the melt acidolysis method and the slurry polymerization method, the polymerizable monomer components used in producing the liquid crystal polyester resin can be subjected to the reaction at room temperature in a modified form in which the hydroxyl group is acylated, i.e., as a lower acylated product. The lower acyl group preferably has 2 to 5 carbon atoms, more preferably 2 or 3 carbon atoms. Particularly preferred is a method in which an acetylated product of the monomer component is used in the reaction.

[0039] The lower acylated monomer may be one which has been previously synthesized by separate acylation, or may be produced in the reaction system by adding an acylating agent such as acetic anhydride to the monomer during the production of the liquid crystal polyester resin.

[0040] In either the molten acidolysis method or the slurry polymerization method, a catalyst may be used during the reaction, if necessary.

[0041] Specific examples of the catalyst include organotin compounds (dialkyltin oxides such as dibutyltin oxide, diaryltin oxides, etc.), titanium dioxide, antimony trioxide, organotitanium compounds (alkoxytitanium silicates, titanium alkoxides, etc.), alkali and alkaline earth metal salts of carboxylic acids (potassium acetate, sodium acetate, etc.), Lewis acids (BF3, etc.), gaseous acid catalysts such as hydrogen halides (HCl, etc.), and the like.

[0042] The amount of the catalyst used is preferably 10 to 1000 ppm, more preferably 20 to 200 ppm, based on the mass of the monomer.

[0043] The liquid crystal polyester resin obtained by such a polycondensation reaction is extracted in a molten state from a polymerization reaction vessel, and then processed into pellets, flakes, or powder, and is subjected to molding or melt-kneading.

[0044] The liquid crystal polyester resin in the form of pellets, flakes, or powder may be heat-treated in a substantially solid state under reduced pressure, in vacuum, or in an atmosphere of an inert gas such as nitrogen or helium, in order to increase the molecular weight and improve the heat resistance.

[0045] The temperature of the heat treatment is not particularly limited as long as the liquid crystal polyester resin does not melt, but is preferably 260 to 350°C, more preferably 280 to 320°C.

[0046] The liquid crystal polyester resin of the present invention thus obtained has a dielectric constant of 3.65 or less, as measured at 10 GHz using a test piece of 85 mm x 1.7 mm x 1.7 mm by a cavity resonator perturbation method in accordance with JIS C2565, and has excellent dielectric properties. The dielectric constant is preferably 3.63 or less, more preferably 3.60 or less. The dielectric constant of the liquid crystal polyester resin of the present invention is usually 3.0 or more.

[0047] The liquid crystal polyester resin of the present invention has an Izod impact strength of preferably 270 J / m or more, and is excellent in mechanical strength. The Izod impact strength of the liquid crystal polyester resin of the present invention is more preferably 280 J / m or more, even more preferably 290 J / m or more, and particularly preferably 295 J / m or more. The Izod impact strength is usually 500 J / m or less.

[0048] The liquid crystal polyester resin of the present invention obtained as described above can be made into a liquid crystal polyester resin composition containing an inorganic filler and / or an organic filler, additives, other resin components, and the like.

[0049] Specific examples of inorganic fillers and / or organic fillers that may be contained in the liquid crystal polyester resin composition of the present invention include glass fibers, silica alumina fibers, alumina fibers, carbon fibers, potassium titanate fibers, aluminum borate fibers, aramid fibers, talc, mica, graphite, wollastonite, dolomite, clay, glass flakes, glass beads, glass balloons, calcium carbonate, barium sulfate, titanium oxide, etc. These fillers may be used alone or in combination of two or more.

[0050] Among these, talc and glass fiber are preferred because they have an excellent balance between mechanical properties and cost.

[0051] When an inorganic filler and / or an organic filler is contained, the content thereof is preferably 1 to 150 parts by mass, more preferably 10 to 100 parts by mass, relative to 100 parts by mass of the liquid crystal polyester resin.

[0052] When the content of the inorganic filler and / or the organic filler is 1 part by mass or more, the liquid crystal polyester resin composition is likely to have an improved mechanical strength. When the content of the inorganic filler and / or the organic filler is more than 150 parts by mass, the fluidity tends to decrease and the effect of improving the dielectric properties tends to be insufficient.

[0053] Specific examples of other additives that may be contained in the liquid crystal polyester resin composition of the present invention include lubricants such as higher fatty acids, higher fatty acid esters, higher fatty acid amides, and higher fatty acid metal salts (here, higher fatty acids refer to those having 10 to 25 carbon atoms), release agents such as polysiloxanes and fluororesins, colorants such as dyes, pigments, and carbon black, flame retardants, antistatic agents, surfactants, antioxidants such as phosphorus-based antioxidants, phenol-based antioxidants, and sulfur-based antioxidants, weathering agents, heat stabilizers, neutralizers, etc. These additives may be used alone or in combination of two or more.

[0054] When these additives are contained, the total content thereof is preferably 0.01 to 10 parts by mass, more preferably 0.1 to 3 parts by mass, relative to 100 parts by mass of the total amount of the liquid crystal polyester resin.

[0055] When a function is expressed by adding an additive, if the content is less than 0.01 parts by mass, the function of the additive tends to be difficult to realize, and if the content exceeds 10 parts by mass, the thermal stability of the liquid crystal polyester resin composition during molding processing tends to be poor.

[0056] Furthermore, when additives such as lubricants and release agents are used among the other additives, they may be added when preparing the liquid crystal polyester resin composition, or may be attached to the surface of the liquid crystal polyester resin pellets during molding processing.

[0057] Specific examples of other resin components that may be contained in the liquid crystal polyester resin composition of the present invention include thermoplastic resins such as polyamide, polyester, polyacetal, polyphenylene ether and its modified products, polysulfone, polyethersulfone, polyetherimide, polyamideimide, etc., and thermosetting resins such as phenolic resin, epoxy resin, polyimide resin, etc. These resin components may be used alone or in combination of two or more.

[0058] When the other resin component is contained, the content thereof is preferably 0.1 to 100 parts by mass, more preferably 0.5 to 80 parts by mass, relative to 100 parts by mass of the liquid crystal polyester resin.

[0059] The liquid crystal polyester resin composition can be obtained by mixing a liquid crystal polyester resin with an inorganic filler and / or fillers, additives or other resin components, and melt-kneading the mixture using a Banbury mixer, kneader, single-screw or twin-screw extruder or the like under temperature conditions ranging from the crystalline melting temperature of the liquid crystal polyester resin to the crystalline melting temperature + 50°C.

[0060] The liquid crystal polyester resin or liquid crystal polyester resin composition of the present invention thus obtained can be processed into a molded product by a known molding method such as injection molding, compression molding, extrusion molding, or blow molding.

[0061] The liquid crystal polyester resin or liquid crystal polyester resin composition of the present invention has excellent dielectric properties, such as a low dielectric constant, and can therefore be suitably used as an electric or electronic part.

[0062] Such electric and electronic components are not particularly limited, but examples thereof include connectors, switches, relays, capacitors, coils, transformers, camera modules, antennas, chip antennas, and electronic circuit boards, particularly substrates such as printed circuit boards, etc. Among these, the material is particularly suitable for use in connectors, antennas, or substrates.

[0063] The liquid crystal polyester resin or liquid crystal polyester resin composition of the present invention may be formed into a film (or sheet) by a known method such as inflation molding, T-die molding, etc. The film may have a single layer structure or a multilayer structure containing different materials. [Example]

[0064] The present invention will be described in detail below with reference to examples, but the present invention is not limited to these examples. The melt viscosity, tensile strength, Izod impact strength and dielectric constant in the examples were measured by the methods described below.

[0065] (1) Melt viscosity The melt viscosity was measured using a melt viscosity measuring device (Capillograph 1D manufactured by Toyo Seiki Co., Ltd.) with a 0.7 mm diameter x 10 mm capillary at a shear rate of 1000 sec -1 The measurements were carried out at 350°C under the following conditions.

[0066] (2) Tensile strength Using an injection molding machine (UH1000-110 manufactured by Nissei Plastic Industrial Co., Ltd.), ASTM No. 4 dumbbell test pieces were molded at a cylinder temperature of 350°C and a mold temperature of 70°C, and measurements were made using these in accordance with ASTM D638.

[0067] (3) Bending strength Using an injection molding machine (MINIMAT M26 / 15 manufactured by Sumitomo Heavy Industries, Ltd.) with a clamping pressure of 15 tonnes, injection molding was carried out at a cylinder temperature of 350°C and a mold temperature of 70°C to prepare rectangular test specimens (length 65 mm x width 12.7 mm x thickness 2.0 mm). A three-point bending test was carried out in accordance with ASTM D790 using an INSTRON 5567 (universal testing machine manufactured by Instron Japan Co., Ltd.) with a span distance of 40.0 mm and a compression speed of 1.3 mm / min.

[0068] (4) Izod impact strength Using an injection molding machine (UH1000-110, manufactured by Nissei Plastic Industrial Co., Ltd.), strip-shaped test specimens measuring 127.0 mm in length, 12.7 mm in width, and 3.2 mm in thickness were molded at a cylinder temperature setting of 350° C. and a mold temperature of 70° C. The center of each test specimen was cut perpendicular to the longitudinal direction to obtain strip-shaped test specimens measuring 63.5 mm in length, 12.7 mm in width, and 3.2 mm in thickness, which were measured in accordance with ASTM D256.

[0069] (5) Dielectric constant Using an injection molding machine (Nissei Plastic Industrial Co., Ltd. NEX-15-1E), the mixture was molded into stick-shaped test pieces measuring 85 mm in length, 1.7 mm in width, and 1.7 mm in thickness at a cylinder temperature of 350°C and a mold temperature of 80°C. Using this test piece, the dielectric constant (10 GHz) was measured by the cavity resonator perturbation method in accordance with JIS C2565 using a network analyzer (PNA series E8316A manufactured by Agilent Technologies).

[0070] In the examples, the following abbreviations represent the following compounds: 3HBA: 3-hydroxybenzoic acid POB: 4-hydroxybenzoic acid BON6: 6-hydroxy-2-naphthoic acid BP: 4,4'-dihydroxybiphenyl HQ: Hydroquinone TPA: Terephthalic acid IPA: Isophthalic acid NDA: 2,6-naphthalenedicarboxylic acid

[0071] [Example 1] A reaction vessel equipped with a stirrer with a torque meter and a distillation tube was charged with 3.5 g (0.5 mol%) of 3HBA, 190.1 g (27.5 mol%) of POB, 673.4 g (71.5 mol%) of BON6, and 2.8 g (0.5 mol%) of HQ, and further charged with 1.03 times the molar amount of acetic anhydride relative to the amount (mol) of hydroxyl groups in all monomers, and deacetic acid polymerization was carried out under the following conditions.

[0072] The temperature was raised from room temperature to 150°C in a nitrogen gas atmosphere over one hour and maintained at that temperature for 30 minutes. The temperature was then rapidly raised to 210°C while distilling off the by-product acetic acid and maintained at that temperature for 30 minutes. The temperature was then raised to 350°C over four hours, after which the pressure was reduced to 10 mmHg over 80 minutes. The polymerization reaction was terminated when a predetermined torque was reached, and the contents of the reactor were removed and crushed to obtain pellets of liquid crystal polyester resin. The amount of acetic acid distilled during polymerization was nearly the theoretical value. The resulting pellets were evaluated using the methods described above. The results are shown in Table 1.

[0073] [Examples 2 to 7, Comparative Examples 1 and 2] Liquid crystal polyester resin pellets were obtained in the same manner as in Example 1, except that 3HBA, POB, BON6, HQ, BP, TPA, IPA, and NDA were used in the proportions (mol%) shown in Table 1. The melt viscosity, tensile strength, flexural strength, Izod impact strength, and dielectric constant of the obtained pellets were measured by the methods described above. The results are shown in Table 1.

[0074] The liquid crystal polyester resins in each example (Examples 1 to 7) had a low dielectric constant of 3.51 to 3.59 and excellent dielectric properties. In addition, they had a high Izod impact strength of 299 to 402 J / m and excellent mechanical strength. In contrast to this, the liquid crystal polyester resins (Comparative Examples 1 and 2) in which the content of repeating units provided by 3HBA was outside the range of the present invention were inferior in dielectric properties and Izod impact strength.

[0075] [Table 1]

Claims

1. Formulas (I) to (V) 【Chemical 1】 [In the formula, Ar １ and Ar ２ each represents one or more divalent aromatic groups, and p, q, r, s, and t each represent a composition ratio (mol %) of each repeating unit in the liquid crystal polyester resin, and satisfy the following condition: 0.3≦p≦7, 15≦q≦40, 60≦r≦85, 0≦s≦7, 0≦t≦7, However, s and t are not simultaneously 0, and s+t is 0.2 to 9 mol %. The repeating unit is represented by A liquid crystal polyester resin having an Izod impact strength of 270 J / m or more and 500 J / m or less.

2. Ar １ and Ar ２ are each independently represented by the formulas (1) to (4) 【Chemistry 2】 The liquid crystal polyester resin according to claim 1, wherein the aromatic group is one or more selected from the group consisting of aromatic groups represented by the formula:

3. 3. The liquid crystal polyester resin according to claim 1, wherein the dielectric constant measured at 10 GHz using a test piece of 85 mm x 1.7 mm x 1.7 mm by a cavity resonator perturbation method in accordance with JIS C2565 is 3.65 or less.

4. A liquid crystal polyester resin composition comprising the liquid crystal polyester resin according to any one of claims 1 to 3 and an inorganic filler and / or an organic filler.

5. 5. The liquid crystal polyester resin composition according to claim 4, wherein the inorganic filler and / or the organic filler is at least one selected from the group consisting of glass fiber, silica alumina fiber, alumina fiber, carbon fiber, potassium titanate fiber, aluminum borate fiber, aramid fiber, talc, mica, graphite, wollastonite, dolomite, clay, glass flakes, glass beads, glass balloons, calcium carbonate, barium sulfate, and titanium oxide.

6. A molded article made from the liquid crystal polyester resin according to any one of claims 1 to 3 or the liquid crystal polyester resin composition according to any one of claims 4 and 5.

7. A molded product as described in claim 6, which is a film.

Images