TW201821530A - Liquid crystal polyester composition and resin molded article using the same - Google Patents

Abstract

A liquid crystal polyester composition comprising an liquid crystal polyester, a hollow filler, a fibrous filler having a number average fiber length of 20 [mu]m or more and less than 190 [mu]m.

Description

Liquid crystal polyester composition and resin molded body using the same

[0001] The present invention relates to a liquid crystal polyester composition and a resin molded body using the same. The present application claims priority based on Application No. 2016-164026, filed on Jan.

[0002] As a connector for an electronic component, for example, a CPU socket is known. The CPU socket is a connector for mounting a CPU (Central Processing Unit) in a form detachable from an electronic circuit board. The CPU socket can be formed by a resin excellent in fluidity, heat resistance, and the like. As such resins, liquid crystal polyesters are known. However, when these resins are used for molding, cracks are likely to occur, and the occurrence of such cracks may be a problem. [0003] The CPU socket has a plurality of pin insertion holes corresponding to the respective connection pins of the CPU to form a lattice. For example, a CPU having a connection pin of about 1000 to 2000 is known as a product suitable for a desktop computer, and a CPU having more than 3,000 connection pins is also known as a product suitable for a server. [0004] The connection pins of the CPU are arranged on the bottom surface of the CPU, for example, in a matrix shape. The distance between the connecting pins tends to be smaller as the number of connecting pins increases. The smaller the distance between the connecting pins, the smaller the distance between the pin insertion holes, and the narrower the wall width of the area distribution insertion holes. Therefore, in the CPU socket, the more the pin insertion hole is, the more the crack is generated around the pin insertion hole after reflow heating, and the occurrence of the crack may be a problem. [0005] Moreover, in order to increase the number of connection pins, the CPU socket has a tendency to increase in size. As a large CPU socket, for example, a CPU socket or the like for a server having a length of more than 70 mm is known. In a large-sized CPU socket, there is a problem that warping after reflow heating due to residual stress (internal stress) becomes a problem. Moreover, warpage of a large CPU socket may also become a problem when molding using the above resin. [0006] A composition that can reduce occurrence of cracks or warpage in a CPU socket is known (for example, Patent Document 1). Patent Document 1 discloses a composite resin composition comprising a liquid crystalline polymer, a plate-like inorganic filler, and a fibrous filler having a weight average fiber length of 250 to 600 μm (hereinafter referred to as a connector). It is called "long fiber filler"). It is disclosed that a planar connector having excellent properties such as moldability, flatness (flatness), slack deformation, and heat resistance is obtained by adding a long fiber filler. [Prior Art Document] [Patent Document] [0007] [Patent Document 1] Japanese Patent Laid-Open Publication No. 2010-003661

[Problems to be Solved by the Invention] However, even if the composite resin composition described in Patent Document 1 is used, the occurrence of cracks or warpage cannot be sufficiently reduced. In addition, in the molded body or the large molded body having a small wall thickness, the occurrence of cracks or warpage is also a problem similar to the connector. The present invention has been made in view of the above circumstances, and an object of the invention is to provide a liquid crystal polyester composition of a connector which is excellent in crack resistance and warpage resistance, and a resin molded body using the same. [Means for Solving the Problem] In order to achieve the object, the inventors of the present invention have reviewed the composition of the material for forming the connector, and have completed the present invention. [0011] An aspect of the present invention provides a liquid crystal polyester composition comprising a liquid crystal polyester, a hollow filler, and a fibrous filler having a number average fiber length of 20 μm or more and less than 190 μm. [0012] In one aspect of the invention, it is preferred that the hollow filler material has an average particle diameter of 5 μm or more and 100 μm or less. [0013] In one aspect of the invention, the fibrous filler material has an average fiber diameter of 5 μm or more and 20 μm or less. [0014] In one aspect of the present invention, it is preferred that the liquid crystal polyester contains 30 mol% or more of the following structural units for all repeating units of the liquid crystal polyester: [0015] . [0016] In one aspect of the invention, the specific heat at a volume of preferably 100 J is 1.0 J/cm ³ K or more and 3.0 J/cm ³ K or less. [0017] An aspect of the present invention provides a resin molded body formed by the above liquid crystal polyester composition. [0018] In one aspect of the invention, the resin molded body is preferably a connector. That is, the present invention encompasses the following aspects. [1] A liquid crystal polyester composition comprising a liquid crystal polyester, a hollow filler, and a fibrous filler having a number average fiber length of 20 μm or more and less than 190 μm. [2] The liquid crystal polyester composition according to [1], wherein the hollow filler has a coefficient average particle diameter of 5 μm or more and 100 μm or less. [3] The liquid crystal polyester composition according to [1] or [2], wherein the fibrous filler material has an average fiber diameter of 5 μm or more and 20 μm or less. [4] The liquid crystal polyester composition according to any one of [1] to [3] wherein the liquid crystal polyester contains 30 mol% or more of the total number of moles of all repeating units of the liquid crystal polyester. Construction unit: . [5] The liquid crystal polyester composition according to any one of [1] to [4], wherein the specific heat at 100 ° C is 1.0 J/cm ³ K or more and 3.0 J/cm ³ K or less. [6] A resin molded body formed by the liquid crystal polyester composition according to any one of [1] to [5]. [7] The resin molded body according to [6], which is a connector. [Effect of the Invention] According to one aspect of the present invention, there is provided a liquid crystal polyester composition which can form a resin molded article excellent in crack resistance and warpage resistance, and a resin molded body using the same, particularly a connector.

<Resin Molded Body> The resin molded system of the present embodiment is formed of a liquid crystal polyester composition to be described later. The resin molded body of the present embodiment is exemplified by electrical properties such as a connector, a socket, a relay, a bobbin, a light extractor, an oscillator, and a computer-related component. Electronic parts; semiconductor manufacturing process related parts such as IC relays; home electrical parts such as VTRs, televisions, electric irons, air conditioners, radios, vacuum cleaners, refrigerators, electric cookers, lighting fixtures, etc.; optical discs, laser discs (registered trademark), Audio equipment parts such as speakers; communication equipment parts such as telephones, fax machines, modems; photocopying machines such as heater brackets, printing machine related parts; mechanical parts such as impellers, fan gears, gears, bearings, motor parts and casings; Microwave conditioning pots, heat-resistant tableware and other conditioning equipment; floor boards, wall materials, etc., heat insulating, sound-insulating materials, beam, column and other supporting materials, roofing materials, etc., or civil engineering materials; aircraft parts , aerospace machine parts; atomic furnace and other radiation facilities components, marine facilities components, cleaning fixtures, hoses, nozzles, sensor parts, sporting goods, leisure and entertainment products. As the resin molded body formed of the liquid crystal polyester composition, a connector is preferred. The reason for this is that the connector has a molded portion having a very small wall thickness (refer to the minimum thickness portion 201 of Fig. 2 to be described later), so that the effect of improving warpage or cracking can be remarkably observed. <Connector> Hereinafter, a case where the connector is a CPU socket will be described with reference to FIGS. 1A, 1B, and 2 as an embodiment of the present invention. For example, the connector according to the embodiment of the present invention includes, as one viewpoint, an opening, an outer frame portion, an inner frame portion, a pin insertion hole, and a minimum thickness portion. 1A and 1B are views showing a structure of a connector according to the present embodiment, and FIG. 1A is a plan view, and FIG. 1B is a cross-sectional view taken along line AA of FIG. 1A. 2 is an enlarged view of a portion indicated by a region B in FIG. 1A. As shown in FIG. 1A, FIG. 1B and FIG. 2, the connector 100 of the present embodiment has a square plate shape in plan view and has a square opening portion 101 at the center. The outer peripheral portion and the inner peripheral portion of the connector 100 are formed in a convex shape on the back surface, and constitute the outer frame portion 102 and the inner frame portion 103. Further, in the area surrounded by the outer frame portion 102 and the inner frame portion 103, 2544 pin insertion holes 104 are provided in a matrix. The pin insertion hole 104 is formed in a horizontal cross section in a square shape. As a result, the entire shape of the portion of the area distribution insertion holes 104, that is, the minimum thickness portion 201 is formed in a lattice shape. The outer shape of the connector 100 can be arbitrarily set according to the purpose, but may be, for example, 72 mm × 72 mm, and the size of the opening portion 101 is, for example, 28 mm × 28 mm. The thickness of the connector 100 is 5 mm in the outer frame portion 102 and the inner frame portion 103, and the region surrounded by the outer frame portion 102 and the inner frame portion 103 (that is, the thickness of the minimum thickness portion 201 in the enlarged view of Fig. 2) is 3mm. The cross-sectional dimension of the pin insertion hole 104 is 0.6 mm × 0.6 mm, and the pitch (that is, the sum of the width of the cross section of the pin insertion hole 104 and the shortest distance between the adjacent pin insertion holes 104) is 1 mm. Further, the width of the minimum thickness portion 201 (that is, the shortest distance between the adjacent pin insertion holes 104) is 0.33 mm. Further, the size shown here is an example, and the number of the pin insertion holes 104 can be arbitrarily set according to the purpose. For example, the connector may have an outer dimension of (30 mm to 75 mm) × (40 mm to 85 mm) and a size of the opening (8 mm to 30 mm) × (8 mm to 30 mm). The thickness of the connector may be 3 to 5 mm in the outer frame portion and the inner frame portion, and the region held by the electrodes (that is, the thickness of the minimum thickness portion) may be 1 to 4 mm. The pin insertion hole of the connector may have a cross-sectional dimension of 0.5 to 1.5 mm, a pitch of 0.5 to 1.5 mm, and a minimum thickness of 0.1 to 1.0 mm. [0027] The connector of the present embodiment is one of the resin molded bodies described above, and is formed by an injection molding method from a liquid crystal polyester composition to be described later. The liquid crystal polyester composition of this embodiment will be described in detail below. <Liquid Crystal Polyester Composition> [Liquid Crystal Polyester] The liquid crystal polyester composition of the present embodiment contains a liquid crystal polyester. One of the liquid crystal polyester-based thermotropic liquid crystal polymers of the present embodiment. The thermotropic liquid crystal polymer forms an anisotropic melt at a temperature of from 270 ° C to 400 ° C. The liquid crystal polyester is preferably obtained by polymerizing an aromatic hydroxycarboxylic acid, an aromatic dicarboxylic acid, and an aromatic diol. Further, in order to more easily produce the liquid crystal polyester, a part of the raw material monomers such as an aromatic hydroxycarboxylic acid, an aromatic dicarboxylic acid, and an aromatic diol may be formed into an ester-forming derivative. polymerization. [0030] The ester-forming derivative can be exemplified by, for example, the following. The ester-forming derivative may, for example, be a compound having a carboxyl group in the molecule of an aromatic hydroxycarboxylic acid or an aromatic dicarboxylic acid. Examples of such ester-forming derivatives include those in which a carboxyl group is converted into a highly reactive oxime halide or an acid anhydride, or a carboxyl group is converted into an ester by a transesterification reaction to form a polyester. Further, examples of the ester-forming derivative include those having a phenolic hydroxyl group like an aromatic hydroxycarboxylic acid and an aromatic diol. As such an ester-forming derivative, a polyester generator is produced by a transesterification reaction by converting a phenolic hydroxyl group into an ester. The method for producing a liquid crystal polyester from such an ester-forming derivative will be described later. [0034] Hereinafter, a specific example will be described with respect to the structural unit of the liquid crystal polyester of the present embodiment. [0035] The structural unit derived from the aromatic hydroxycarboxylic acid is as follows. As will be described later, in the present embodiment, the structural unit is used (A) ₁ ) and (A ₂ The situation is explained. By "derived from" herein is meant a change in the chemical structure from the starting monomer used for polymerization. [0036] [0037] The structural units may also be substituted with at least one substituent selected from the group consisting of a halogen atom, an alkyl group, and an aryl group, a portion of a hydrogen atom located in the aromatic ring. [0038] The structural unit derived from the aromatic dicarboxylic acid has the following ones. As will be described later, in the present embodiment, the structural unit is used (B). ₁ ), (B ₂ ) and (B ₃ The situation is explained. [0039] [0040] The structural units may also be substituted with at least one substituent selected from a halogen atom, an alkyl group, and an aryl group in a portion of a hydrogen atom located in the aromatic ring. [0041] The structural unit derived from the aromatic diol is as follows. As will be described later, in the present embodiment, the structural unit is used (C) ₁ ) and (C ₃ The situation is explained. [0042] [0043] The structural units may also be substituted with at least one substituent selected from a halogen atom, an alkyl group, and an aryl group in a portion of a hydrogen atom located in the aromatic ring. Further, in the structural units, the halogen atom as a substituent is exemplified by a fluorine atom, a chlorine atom or a bromine atom. Further, the alkyl group as a substituent is exemplified by a lower alkyl group having a carbon number of about 1 to 4 such as a methyl group, an ethyl group or a butyl group. Further, the aryl group as a substituent is exemplified by a phenyl group or the like. [0045] Next, a preferred combination of the above structural units will be described. In the present embodiment, the structural unit of the liquid crystal polyester is preferably used in combination as shown in any one of the following [a] to [f]. [a]: (A ₁ ), (B ₁ ) or (B ₂ ) or (B ₁ ) and (B ₂ Both, and (C ₁ a combination of). [b]:(A ₁ ) and (A ₂ a combination of). [c]: In the combination of the above [a], (A ₁ One part of the passage (A ₂ ) Replacer. [d]: In the combination of the above [a], (B ₁ One part of the passage (B ₃ ) Replacer. [e]: In the combination of the above [a], (C ₁ One part of the passage (C ₃ ) Replacer. [f]: in the combination of the above [b], plus (B ₁ ) and (C ₁ )By. [00] In the combinations [a] to [f], it is particularly preferred to combine [a], that is, a structural unit derived from p-hydroxybenzoic acid (corresponding to the above structural unit (A) ₁ )), a structural unit derived from 4,4'-dihydroxybiphenyl (corresponding to the above structural unit (C ₁ )), a structural unit derived from terephthalic acid, a structural unit derived from isophthalic acid or a structural unit derived from terephthalic acid and a structural unit derived from isophthalic acid (corresponding to the above structural unit (B) ₁ ), the above structural unit (B ₂ ) or the above structural unit (B ₁ ) and (B ₂ )) A combination of liquid crystal polyesters. Furthermore, in this combination, a better structural unit (A ₁ ) and structural units (C ₁ Mo ratio (C ₁ )/(A ₁ ) is 0.2 or more and 1.0 or less, and the structural unit (C) ₁ Relative to the structural unit (B ₁ ) and structural units (B ₂ The total molar ratio {(B ₁ )+(B ₂ )}/(C ₁ ) is 0.9 or more and 1.1 or less. In addition, the structural unit (B ₁ ) and structural units (B ₂ Mo ratio (B ₂ )/(B ₁ It is preferably greater than 0 and 1 or less, and more preferably greater than 0 and 0.3 or less. The liquid crystal polyester of the present embodiment preferably contains 30 mol% or more and 80 mol% or less of the above structural unit for the total number of moles of all repeating units of the liquid crystal polyester (A). ₁ ). The flow initiation temperature of the liquid crystal polyester of the present embodiment is preferably from 270 to 400 ° C, more preferably from 280 to 380 ° C. When the flow initiation temperature falls within the range, the fluidity of the liquid crystal polyester composition is improved, and the heat resistance (the soldering property when the molded article is an electronic component such as a socket) is improved. In addition, when the flow initiation temperature is in the above range, it is difficult to cause thermal deterioration in order to obtain a molded body from the liquid crystal polyester and perform melt molding. [0050] In the present embodiment, the flow initiation temperature is defined as "using a capillary rheometer having a nozzle having an inner diameter of 1 mm and a length of 10 mm, at 9.8 MPa (100 kg/cm). ² When the heating melt of the liquid crystal polyester is extruded from the nozzle at a heating rate of 4 ° C / min, the melt viscosity is 4800 Pa. The temperature of seconds (ie 48,000 poise). These definitions are used as molecular weight standards for liquid crystal polyesters and are well known to those skilled in the art (for example, refer to Komori Naoto, "Liquid Crystal Polymers - Synthesis, Forming, Applications -", pp. 95-105, CMC, 1987 6 Issued on the 5th of May). In the liquid crystal polyester of the present embodiment, since the polymer chain is introduced into the rigid portion, the complexation of the polymers is small, so the viscosity is low, and the fluidity at the time of molding processing is excellent. Therefore, it can also be applied to a molded article having a thin-walled structure or a fine structure which is difficult to process by conventional resins. Further, the liquid crystal polyester of the present embodiment is also excellent in chemical resistance and flame retardancy, and particularly in flame retardancy, UL94 V-0 can be achieved even without a flame retardant. The content of the liquid crystal polyester is preferably from 55 to 75% by mass based on the total mass of the liquid crystal polyester composition of the present embodiment. [0054] The liquid crystal polyester composition of the present embodiment preferably has a volume specific heat of 1.0 J/cm at 100 ° C. ³ K above 3.0J/cm ³ Below K, it can be 1.50J/cm ³ K above 2.0J/cm ³ Below K, it can also be 1.62J/cm ³ K above 1.95J/cm ³ Below K. In the present specification, the "volume specific heat of the liquid crystal polyester composition" is a value calculated from the specific heat capacity (unit: J/gK) and density measured according to JIS K7123:2012 for the liquid crystal polyester composition based on the following formula. Volume specific heat (J/cm ³ K) = specific heat capacity (J / gK) × density (g / cm ³ In the present specification, the "specific heat capacity of the liquid crystal polyester composition" can be measured by a differential scanning calorimeter "DSC-50" manufactured by Shimadzu Corporation. On the other hand, the density of the liquid crystal polyester composition can be measured by a solid hydrometer "ASG-320K" manufactured by Kanto Measurement Co., Ltd. In the present embodiment, the "volume specific heat of the liquid crystal polyester composition" means the heat capacity per unit volume which is the index of the cooling rate. The volume specific heat of the liquid crystal polyester composition to be described later is related to the volume specific heat of the resin molded body formed from the liquid crystal polyester composition, and the liquid crystal polyester composition has a smaller volume specific heat and can be effectively cooled during molding. The reduction of the specific heat of the liquid crystal polyester composition will be described later. [Hollow Filler] The liquid crystal polyester composition of the present embodiment includes a hollow filler and a fibrous filler. The material of the hollow filler used in the embodiment is not particularly limited, and examples thereof include inorganic materials such as glass, cerium oxide, and aluminum oxide; and organic materials such as urea resin and phenol resin. [0059] The hollow filler may be a mixture of two or more kinds as needed, or two or more lightweight functional fillers. The "lightweight functional filler" refers to a filler having a space inside for the purpose of weight reduction. Examples of the lightweight functional filler include porous ceramic particles, expandable particles, and hollow particles. Among these, the material of the hollow filler is preferably glass based on heat resistance or strength. That is, as the hollow filler, hollow particles called glass spheres are preferably used. [0060] By adding a hollow filler, the volume specific heat of the liquid crystal polyester composition can be reduced. In the conventional liquid crystal polyester composition, it is possible to cool the portion and the portion which is not easily cooled, for the reason of the structure of the mold used for injection molding. Thereby, there is a case where the portion to be solidified is broken (cracking) due to partial shrinkage of the subsequent solidification. On the other hand, in the liquid crystal polyester composition of the present embodiment, since the volume specific heat is smaller than that of the conventional liquid crystal polyester composition, the liquid crystal polyester composition can be effectively cooled at the time of injection molding. Therefore, since the liquid crystal polyester composition is uniformly cooled as a whole, cracking caused by shrinkage due to curing of the liquid crystal polyester composition can be reduced. The number average particle diameter of the hollow filler used in the embodiment is preferably from 5 μm to 100 μm, more preferably from 10 μm to 100 μm. When the number average particle diameter of the hollow filler is less than 5 μm, the alignment of the liquid crystal polymer (liquid crystal polyester) cannot be sufficiently suppressed, and the void ratio of the resin molded body is lowered, and the volume reduction ratio of the hollow filler cannot be sufficiently exhibited. effect. Therefore, there is a case where the amount of warping deformation of the resin molded body is increased. When the number average particle diameter of the hollow filler is more than 100 μm, the hollow filler is not uniformly dispersed in the liquid crystal polyester composition, and the pressure resistance of the hollow filler is also lowered. The situation that the breaking rate becomes larger. When the distribution of the hollow filler is offset, and the crushing rate is increased, the effect of reducing the volume ratio heat of the hollow filler cannot be sufficiently exhibited, so that the occurrence of cracks cannot be sufficiently suppressed. In other words, when the number average particle diameter of the hollow filler is within the above range, the alignment of the liquid crystal polymer (liquid crystal polyester) can be sufficiently suppressed, and the void ratio of the resin molded body is not lowered, so that the hollow filler can be sufficiently exhibited. The effect of reducing the volume ratio heat can suppress the amount of warping deformation of the resin molded body. Further, since the hollow filler is uniformly dispersed in the liquid crystal polyester composition, the pressure resistance of the hollow filler is not lowered, so that the fracture rate does not become large. Therefore, the effect of reducing the volume specific heat of the hollow filler can be sufficiently exhibited, and the occurrence of cracks can be sufficiently suppressed. In the present specification, the "number average particle diameter" is an arithmetic mean of the number basis and can be measured by the particle size distribution of the laser diffraction method. [0064] The thickness of the hollow filler is set to a value corresponding to the number average particle diameter of the hollow filler so that the porosity is from about 5/6 to 3/4 in terms of the density of the hollow filler. can. When the void ratio of the hollow filler is about 3/4, the pressure resistance can be maintained and the volume specific heat of the liquid crystal polyester composition can be sufficiently reduced. The density of the hollow filler can be determined by the sampling method of ASTM D2841. The larger the amount of the hollow filler to be added, the more the warpage of the molded article (resin molded body) can be reduced, but conversely, the extrudability or formability of the liquid crystal polyester composition at the time of injection molding is deteriorated. In particular, when the amount of the hollow filler is too large, the fluidity of the liquid crystal polyester composition is deteriorated, so that the filling failure of the mold is liable to occur. On the other hand, when the amount of the hollow filler to be added is too small, the volume specific gravity of the liquid crystal polyester composition is not sufficiently lowered, and sufficient resistance to warpage or cracking cannot be obtained. In the present embodiment, the amount of the hollow filler to be added is preferably 5 parts by mass or more and 80 parts by mass or less, more preferably 10 parts by mass or more and 50 parts by mass or less based on 100 parts by mass of the liquid crystal polyester. Further, it may be more than 30 parts by mass, or may be more than 30 parts by mass and 50 parts by mass or less. In another aspect, the amount of the hollow filler to be added is preferably from 10 to 30% by mass, and may be from 19 to 26% by mass based on the total mass of the liquid crystal polyester composition. [Fibrous filler] The material of the fibrous filler used in the embodiment is not particularly limited, and examples thereof include glass fiber, cerium oxide alumina fiber, alumina fiber, and carbon fiber. The number average fiber diameter of the fibrous filler used in the embodiment is preferably 5 μm or more and 20 μm or less. When the number average fiber diameter of the fibrous filler is 5 μm or more, sufficient strength can be imparted to the resin molded body. On the other hand, when the number average fiber diameter of the fibrous filler becomes large, the number of the fibrous fillers at the same mass is small. When the number of the fibrous fillers is small, the contact surface area with respect to the liquid crystal polyester becomes small. When the number average fiber diameter of the fibrous filler is 20 μm or less, the contact surface area with respect to the liquid crystal polyester when compared with the same mass is sufficient, and sufficient strength can be imparted to the resin molded body. [0070] The number average fiber length of the fibrous filler is preferably 20 μm or more and less than 190 μm. When the number average fiber length of the fibrous filler is 190 μm or more, the crushing ratio of the hollow filler (hollow filler) may increase. In this case, the longer the average fiber length of the fibrous filler, the larger the friction during the melt kneading, and the higher the shear pressure. When the shear pressure exceeds the compressive strength of the hollow filler, it is presumed that the hollow filler is easily broken, and the crushing ratio of the hollow filler is increased. Thereby, not only the alignment of the liquid crystal polyester composition becomes strong, but also the volume specific heat becomes high. When the resin molded body to be described later is a molded body having a lattice-like structure like a CPU socket, the longer the fiber length is, the more the molten resin becomes a laminar flow in the mold. The laminar flow portion tends to align the resin and the fibrous filler in the flow direction. Therefore, the shrinkage of the resin molded body is anisotropic. Increasing heterogeneity. Therefore, there is a case where the warpage of the resin molded body cannot be sufficiently reduced. In other words, when the number average fiber length of the fibrous filler is within the above range, the hollow filler is less likely to be broken, so that the alignment of the liquid crystal polyester composition can be prevented from being excessively strong, and the volume specific heat can be prevented from being excessively high. In the case where the resin molded body is a molded body having a lattice structure, in the portion where the molten resin in the mold is formed as a laminar flow during molding, the resin and the fibrous filler are difficult to be aligned in the flow direction, and the shrinkage ratio of the resin molded body can be prevented. Anisotropy. The unevenness is increased, and the warpage of the resin molded body can be sufficiently reduced. In the connector of the present embodiment, since the molded portion having a very small wall thickness of the molded body (refer to the minimum thickness portion 201 of FIG. 2) is provided, warpage is remarkably observed. Therefore, the number average fiber length of the fibrous filler is preferably 20 μm or more and less than 190 μm, more preferably 20 μm or more and 140 μm or less, still more preferably 20 μm or more and 130 μm or less, and still more preferably 20 μm or more and 80 μm or less. In the present specification, the "number average fiber length" can be obtained by, for example, dispersing a residue obtained by ashing a liquid crystal polyester composition in water, using a dynamic image analysis method/particle analyzer PITA-3 (SEISHIN Co., Ltd. Obtained by measurement. The moving image analysis method is a method of continuously photographing particles or the like dispersed in a fluid to analyze a particle size distribution or a shape distribution. The "number average fiber diameter" can be obtained, for example, by dynamic image analysis. Further, the breaking rate of the hollow filler is a value calculated as follows. Using the density of the liquid crystal polyester, each filler (including the hollow filler and the fibrous filler) or the additive added as needed, the theoretical ratio of the resin molded body can be calculated from the blend ratio of the liquid crystal polyester composition (breakage ratio) Density at zero time). Next, the density (solid density) of the actual resin molded body was measured, and the difference between the real density and the theoretical density was determined, and the breaking rate was calculated. [0073] [wherein, α represents a blending amount of the hollow filler (parts by mass relative to 100 parts by mass of the liquid crystal polyester), and β represents a blending amount of the fibrous filler (parts by mass relative to 100 parts by mass of the liquid crystal polyester) ), ρ ₀ Indicates the true density of liquid crystal polyester, ρ ₁ Indicates the true density of the hollow filler, ρ ₂ Indicates the material density of the hollow filler, ρ ₃ The true density of the fibrous filler is shown, and ρ is the actual density of the ASTM No. 4 dumbbell test piece obtained by injection molding the liquid crystal polyester composition. [0074] In the above formula, the theoretical density of the resin molded body is (100/ρ ₀ )+(α/ρ ₁ )+(β/ρ ₃ ) said. Further, the solid density of the resin molded body is represented by (100 + α + β) / ρ. Further, the solid density of the resin molded body can be measured by the ISO 1183 test method. In addition, the amount of the fibrous filler to be added is preferably 5 parts by mass or more and 80 parts by mass or less, more preferably 10 parts by mass or more and 50 parts by mass or less based on 100 parts by mass of the liquid crystal polyester. In addition, the total amount of the hollow filler and the fibrous filler is preferably from 10 parts by mass to 100 parts by mass, more preferably from 30 parts by mass to 100 parts by mass, per 100 parts by mass of the liquid crystal polyester. More preferably, it is more than 50 parts by mass and 95 parts by mass or less. In another aspect, the amount of the fibrous filler to be added is preferably from 5 to 25% by mass, and may be from 14 to 20% by mass based on the total mass of the liquid crystal polyester composition. The total amount of the hollow filler and the fibrous filler to be added is preferably from 25 to 45% by mass, and may be from 39 to 41% by mass based on the total mass of the liquid crystal polyester composition. [Plate Filler] In the liquid crystal polyester composition of the present embodiment, in addition to the hollow filler and the fibrous filler, a plate-shaped filler may be further added. The material of the plate-shaped filler used in the embodiment is not particularly limited, and examples thereof include talc, mica, and graphite. Among these, talc and mica are preferred. When the amount of the plate-shaped filler to be added is increased, the warpage of the molded article (resin molded body) can be further reduced, but conversely, the liquid crystal polyester composition is deteriorated in extrusion property or formability. In particular, when the amount of the plate-shaped filler is too large, the fluidity of the liquid crystal polyester composition is deteriorated, so that filling failure is likely to occur. Further, when the amount of the plate-shaped filler is too large, the mechanical strength of the resin molded body is lowered, so that the crack resistance is also adversely affected. In the connector of the present embodiment, since the molded portion having a very small thickness is formed, the crack is remarkably observed. Therefore, the amount of the plate-shaped filler to be added is preferably 5 parts by mass or more and 50 parts by mass or less, more preferably 5 parts by mass or more and less than 30 parts by mass, per 100 parts by mass of the liquid crystal polyester. As another viewpoint, the amount of the plate-shaped filler added is preferably from 5 to 25% by mass based on the total mass of the liquid crystal polyester composition. [Other Additives] In the liquid crystal polyester composition of the present embodiment, a mold release modifier such as a fluororesin or a metal soap, or a dye or a pigment may be added to the extent that the effects of the present invention are not impaired. An additive commonly used in injection moldings such as coloring agents, or antioxidants, or thermal stabilizers, or ultraviolet absorbers, or antistatic agents, or surfactants. Further, those having an external slip effect such as a higher fatty acid, a higher fatty acid ester, a higher fatty acid metal salt, or a fluorocarbon surfactant may be added. Further, a thermoplastic resin other than the above may be added in a small amount, such as polyamine, polyester, polyphenylene sulfide, polyether ketone, polycarbonate, polyphenylene ether, and modified substances thereof, polyfluorene, polyether oxime. A polyether quinone or the like, or a thermosetting resin such as a phenol resin, an epoxy resin, a polyimide resin, or the like. In other words, the liquid crystal polyester composition of the present embodiment includes the liquid crystal polyester, the hollow filler, the fibrous filler, the desired plate-shaped filler, and a group selected from the other additives. At least one. <Method for Producing Resin Molded Body> Next, a method for producing a resin molded body using the liquid crystal polyester composition of the present embodiment will be described. Hereinafter, a CPU socket which is one of the connectors is exemplified as a resin molded body, and a manufacturing method thereof will be described. However, the present embodiment is not limited thereto. [Method for Producing Liquid Crystal Polyester] Hereinafter, an example of a method for producing a liquid crystal polyester according to the present embodiment will be described. The liquid crystal polyester of the present embodiment is preferably produced by the following deuteration step and polymerization step. [Deuteration step]: the phenolic hydroxyl group of the aromatic diol and the aromatic hydroxycarboxylic acid is deuterated by a fatty acid anhydride (for example, acetic anhydride or the like) to obtain a hydrazine compound (that is, an aromatic diol oxime compound and an aromatic hydroxy group). Carboxylic acid halide). [Polymerization step]: The mercapto group of the telluride obtained in the deuteration step is transesterified with a carboxyl group of an aromatic dicarboxylic acid and a halide of an aromatic hydroxycarboxylic acid to obtain a liquid crystal polyester. The deuteration step and the polymerization step can be carried out in the presence of a heterocyclic organic base compound as shown below. [0086] [0087] In the above structural formula, R ₁ ~R ₄ Each independently represents a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, a hydroxymethyl group, a cyano group, a cyano group having 1 to 4 carbon atoms, and a cyano group having 1 to 4 carbon atoms in the alkoxy group. Alkoxy group, carboxyl group, amine group, aminoalkyl group having 1 to 4 carbon atoms, amino alkoxy group having 1 to 4 carbon atoms, phenyl group, benzyl group, phenylpropyl group or decyl group. Among the above heterocyclic organic base compounds, 1-methylimidazole or 1-ethylimidazole or both thereof are particularly preferred because of ease of availability. The amount of the heterocyclic organic base compound used is set to 100 parts by mass based on the total amount of the raw material monomers (that is, the aromatic dicarboxylic acid, the aromatic diol, and the aromatic hydroxycarboxylic acid) of the liquid crystal polyester. It is preferably 0.005 to 1 part by mass. In addition, from the viewpoint of improving the color tone or productivity of the molded article (the resin molded article in the embodiment), it is preferably 0.05 to 0.5 parts by mass based on 100 parts by mass of the total amount of the raw material monomers. The heterocyclic organic base compound may be present in one period of the deuteration reaction and the transesterification reaction, and the addition period may be before the start of the deuteration reaction, or during the deuteration reaction, or Between the deuteration reaction and the transesterification reaction. The liquid crystal polyester thus obtained has an advantage that the melt fluidity is very high. The amount of the fatty acid anhydride (for example, acetic anhydride or the like) used is determined in consideration of the amount of the aromatic diol or the aromatic hydroxycarboxylic acid of the raw material monomer or both. Specifically, the total amount of the phenolic hydroxyl groups contained in the raw material monomers is preferably 1.0 to 1.2 equivalents, more preferably 1.0 to 1.15 equivalents, and still more preferably 1.03 to 1.12 equivalents. Preferably, it is 1.05 to 1.1 times equivalent. The deuteration reaction in the above deuteration step is preferably carried out at a temperature ranging from 130 ° C to 180 ° C for 30 minutes to 20 hours, more preferably at 140 ° C to 160 ° C for 1 to 5 hours. The aromatic dicarboxylic acid used in the above polymerization step may be present in the reaction system at the deuteration step. That is, in the deuteration step, the aromatic diol, the aromatic hydroxycarboxylic acid, and the aromatic dicarboxylic acid may be present in the same reaction system. This is because the carboxyl group of the aromatic dicarboxylic acid and the optionally substituted substituent are not affected by the fatty acid anhydride. Therefore, the aromatic diol, the aromatic hydroxycarboxylic acid, and the aromatic dicarboxylic acid may be fed to the reactor, and then the deuteration step and the polymerization step may be sequentially performed, or the aromatic diol and the aromatic group may be used. After the dicarboxylic acid is fed to the reactor for the deuteration step, the aromatic dicarboxylic acid is further fed to the reactor for the polymerization step. The former method is preferred based on the viewpoint of simplifying the manufacturing steps. The transesterification reaction in the above polymerization step is preferably carried out at a temperature increase rate of 0.1 to 50 ° C /min from 130 ° C to 400 ° C, and more preferably from 150 ° C at a temperature increase rate of 0.3 to 5 ° C / min. Performed at 350 ° C. Further, in the transesterification reaction in the polymerization step, in order to shift the equilibrium, it is preferred to evaporate and remove the by-produced fatty acid (for example, acetic acid or the like) and unreacted fatty acid anhydride (for example, acetic anhydride) to the outside of the system. At this time, it is also possible to return to the reactor by condensing or subliming the raw material monomer or the like which is evaporated or sublimated together with the fatty acid by refluxing a part of the distilled fatty acid back to the reactor. The deuteration reaction of the deuteration step and the transesterification of the polymerization step may use a batch apparatus as a reactor, or a continuous apparatus may be used. The liquid crystal polyester usable in the present embodiment can be obtained by using any of the reaction devices. [0097] After the polymerization step, a step of polymerizing the liquid crystal polyester obtained by the polymerization step may be performed. For example, the liquid crystal polyester obtained by the polymerization step is cooled and pulverized to prepare a powdery liquid crystal polyester, and by heating the powder, the liquid crystal polyester can be polymerized. Further, the particulate liquid crystal polyester is granulated by cooling and pulverizing the powdery liquid crystal polyester, and then the high molecular weight of the liquid crystal polyester can be obtained by heating the particulate liquid crystal polyester. Chemical. The high molecular weight using this method is referred to as solid phase polymerization in the aforementioned technical field. Solid phase polymerization is particularly effective as a method for polymerizing a liquid crystal polyester. By polymerizing the liquid crystal polyester, a liquid crystal polyester having the above preferred flow initiation temperature can be obtained. The heat treatment in the solid phase polymerization is preferably carried out under an atmosphere of an inert gas such as nitrogen or under a reduced pressure. Further, the heating time in the solid phase polymerization is preferably from 1 to 20 hours. The heating temperature is preferably from 130 to 400 °C. Further, examples of the apparatus used for the heat treatment are known dryers, reactors, inert ovens, mixers, electric furnaces and the like. [Method of Blending Liquid Crystal Polyester Composition] The method of blending the raw material components of the liquid crystal polyester composition of the present embodiment is not particularly limited. For example, the liquid crystal polyester produced by the above method, the hollow filler, the fibrous filler, and the plate filler as needed or the above additives (that is, the above-mentioned release agent, heat stabilizer, etc.) can be individually supplied to Melt the mixer. Further, the raw material components may be premixed using a mortar, a Henschel mixer, a ball mill, a rib blender, or the like, and then supplied to a melt mixer. Further, particles prepared by melt-mixing the liquid crystal polyester and the fibrous filler may be mixed with the particles produced by melt-mixing the liquid crystal polyester and the hollow filler, and mixed at a desired blend ratio. [Manufacturing Method of Resin Molded Body] In the present embodiment, a CPU socket of the resin molded body shown in Fig. 1 is produced from the liquid crystal polyester composition obtained by the above-described blending method. For the production, for example, an injection molding method can be used. The injection molding in the present embodiment can be carried out by melting a liquid crystal polyester composition using a conventional injection molding machine, heating the molten liquid crystal polyester composition to an appropriate temperature, and ejecting it into a mold. The temperature at which the liquid crystal polyester composition is heated and melted for the injection is based on the flow initiation temperature Tp ° C of the liquid crystal polyester composition to be used, preferably [Tp+10] ° C or more, [Tp+ 50] below °C. Further, the mold temperature is preferably selected from the range of room temperature (for example, 23 ° C) to 180 ° C from the viewpoint of the cooling rate and productivity of the liquid crystal polyester composition. According to the present embodiment, a liquid crystal polyester composition capable of forming a resin molded article excellent in crack resistance and warpage resistance is provided. Moreover, by using these liquid crystal polyester compositions, a resin molded body excellent in crack resistance and warpage resistance, in particular, a connector is provided. Another viewpoint of the liquid crystal polyester composition of the present invention is a liquid crystal polyester composition comprising a liquid crystal polyester, a hollow filler, a fibrous filler, a desired plate filler, and other At least one selected from the group consisting of: the liquid crystal polyester contains structural units (A) ₁ ), structural unit (B ₁ ), structural unit (B ₂ And structural units (C ₁ ), construction unit (C ₁ ) and structural unit (A ₁ Mo ratio (C ₁ )/(A ₁ ) is 0.2 or more and 1.0 or less, and the structural unit (C) ₁ Relative to the structural unit (B ₁ ) and structural units (B ₂ The total molar ratio {(B ₁ )+(B ₂ )}/(C ₁ ) more than 0 and 1 or less, structural unit (B ₁ ) and structural units (B ₂ Mo ratio (B ₂ )/(B ₁ The hollow filler is at least one selected from the group consisting of glass, cerium oxide, aluminum oxide, urea resin, and phenol resin, preferably a glass sphere, and has a number average particle diameter of 5 μm or more. In the case of 100 μm or less, preferably 10 μm or more and 100 μm or less, the content of the hollow filler is 5 parts by mass or more and 80 parts by mass or less, preferably 10 parts by mass or more and 50 parts by mass or less based on 100 parts by mass of the liquid crystal polyester. Hereinafter, the total mass of the liquid crystal polyester composition is 19 to 26% by mass; and the fibrous filler is at least one selected from the group consisting of glass fibers, cerium oxide alumina fibers, alumina fibers, and carbon fibers. Preferably, it is a glass fiber, and the number average fiber length is 20 μm or more and less than 190 μm, preferably 20 μm or more and 140 μm or less, more preferably 20 μm or more and 130 μm or less, and more preferably 20 μm or more and 80 μm or less. The content of the fibrous filler is 5 parts by mass or more and 80 parts by mass or less, preferably 1 or less, based on 100 parts by mass of the liquid crystal polyester. 0 parts by mass or more and 50 parts by mass or less, or 14 to 20% by mass based on the total mass of the liquid crystal polyester composition; the total content of the hollow filler and the fibrous filler described above, relative to the liquid crystal polyester 100 described above The mass part is 10 parts by mass or more and 100 parts by mass or less, preferably 30 parts by mass or more and 100 parts by mass or less, more preferably 50 parts by mass or more and 95 parts by mass or less, or 39 or less based on the total mass of the liquid crystal polyester composition. ～41% by mass. Still another aspect of the present invention is a connector formed by injection molding from the above liquid crystal polyester. [Embodiment] Hereinafter, an embodiment of the present invention will be described, but the present invention is not limited to the embodiment. The physical properties of the liquid crystal polyester were measured by the following methods. <Measurement of the flow initiation temperature of the liquid crystal polyester> A flow tester (manufactured by Shimadzu Corporation, model CFT-500) was used, and about 2 g of the liquid crystal polyester was filled in a nozzle having an inner diameter of 1 mm and a length of 10 mm. In the cylinder of the nozzle, at 9.8 MPa (100 kg/cm) ² Under the load, the temperature is raised at a rate of 4 ° C / min, while the liquid crystal polyester is melted and extruded from the nozzle, the measurement shows 4800 Pa. The temperature of the viscosity of s (48000 poise). <Production Example (Production of Liquid Crystal Polyester)> A liquid crystal polyester was produced by the following method. [0110] First, in a reactor equipped with a stirring device, a torque meter, a nitrogen gas introduction tube, a thermometer, and a reflux cooler, the feed is obtained to obtain a structural unit (A) ₁ ) p-hydroxybenzoic acid 994.5 g (7.2 mol), to obtain structural units (C ₁ 4,4'-dihydroxybiphenyl 446.9g (2.4m), obtained structural unit (B ₁ ) terephthalic acid 299.0g (1.8 m), obtained structural unit (B ₂ 99.7 g (0.6 mol) of phthalic acid and 1347.6 g (13.2 mol) of acetic anhydride. At this time, the molar ratio (C ₁ )/(A ₁ ) about 0.3, molar ratio {(B ₁ )+(B ₂ )}/(C ₁ ) is 1.0, molar ratio (B ₂ )/(B ₁ ) about 0.3. Next, after the reactor was sufficiently substituted with nitrogen, 0.18 g of 1-methylimidazole was added, and the temperature was raised from room temperature to 150 ° C under a nitrogen gas stream for 30 minutes, and the temperature was maintained at reflux for 30 minutes. Further, after 2.4 g of 1-methylimidazole was added, the distillate acetic acid or unreacted acetic anhydride was distilled off, and the temperature was raised from 150 ° C to 320 ° C at 2 hours and 50 minutes. Then, the point at which the torque rise is seen is regarded as the end of the reaction, and the contents are taken out. Next, the solid content (content) thus obtained was cooled to room temperature, and pulverized by a coarse pulverizer. The solid content after the pulverization was heated to room temperature from room temperature to 250 ° C in 1 hour under nitrogen atmosphere, and further heated to 250 ° C for 5 hours to 295 ° C, and further maintained at 295 ° C for 3 hours to carry out solid phase polymerization. Finally, a liquid crystal polyester is obtained by cooling the product obtained by solid phase polymerization. The resulting liquid crystal polyester had a flow initiation temperature of 327 °C. <Examples 1 to 3 and Comparative Examples 1 and 2 (Mixed and formed of liquid crystal polyester composition)> Using the liquid crystal polyester obtained in the production example, Examples 1 to 3 and Comparative Example 1 were produced as follows. ～2 CPU sockets each. [0115] The liquid crystal polyester and various fillers were blended in a mass composition ratio shown in Table 1, and a 2-axis extruder ("PCM-30" manufactured by Chiba Iron Works Co., Ltd.) was used at a cylinder temperature of 340 ° C. Granulation was carried out to obtain a particulate liquid crystal polyester composition (Examples 1 to 3 and Comparative Examples 1 to 4). Subsequently, the obtained particulate liquid crystal polyester composition was molded under the following molding conditions, and the connectors of Examples 1 to 3 and Comparative Examples 1 and 2 were produced (Fig. 1 (A), Fig. 1 (B), and Fig. 2). 2544 pin corresponds to the model CPU socket, hereinafter referred to as "CPU socket"). Further, various fillers used in the present embodiment are as follows. The number average fiber length, the number average fiber diameter, and the number average particle diameter of various filler materials are catalog values. [Filling material] (1) Hollow filler glass ball: S60HS (manufactured by Sumitomo 3M Co., Ltd.), number average particle size 20 μm (2) Fiber filler, ground glass fiber: EFH75-01 (limited by CENTRALFIBER) Company system), number average fiber length 75 μm, number average fiber diameter 11 μm: EFH150-01 (manufactured by CENTRALFIBER Co., Ltd.), number average fiber length 150 μm, number average fiber diameter 11 μm (3) granular filler glass beads: EGB731 ( POTTERS BALLOTINI CO., LTD., number average particle diameter 20 μm [0117] [Molding conditions] Molding machine: FANUC company, "ROBOSHOT S-2000i 30B" Cylinder temperature: 360 ° C Mold temperature: 100 ° C Injection speed: 250 mm / sec <Evaluation of CPU Sockets> The following seven types of CPU sockets obtained in Examples 1 to 3 and Comparative Examples 1 and 2 were evaluated as follows. (1) Warpage amount (evaluation of warpage resistance) The obtained CPU socket was placed on a glass plane, and the flatness measurement module "9030c" manufactured by CORRS Co., Ltd. was used to find any 92 points in the CPU socket. The height from the aforementioned glass plane. Next, using the aforementioned height of 92 points, the least square plane of the aforementioned CPU socket is calculated by the least square method. The distance from the least square plane to the highest point of the 92-point height when the minimum square plane height is moved in parallel so as to include the lowest point among the 92 points is calculated as the amount of warpage. [0120] Next, the CPU socket is subjected to heat treatment: heating from room temperature to 160 ° C at a temperature increase rate of 2 ° C / sec, holding at 160 ° C for 1 minute, and further increasing the temperature to 250 ° C at a temperature increase rate of 2 ° C / sec. Hold at 250 ° C for 1 minute, then slowly cool to 50 ° C. Next, after the heat-treated CPU socket was cooled to room temperature, the amount of warpage was measured in the same manner as above. The above operation was performed on three different test pieces (CPU sockets) produced in each of Examples 1 to 3 and Comparative Examples 1 and 2, and the average value thereof was "the amount of warpage after heating". The results are shown in Table 1. (2) Cracking (Evaluation of Crack Resistance) After the heat treatment, the CPU socket was cooled to room temperature, and a digital microscope ("VHX-1000" manufactured by KYENCE Co., Ltd., using the lens "VH-Z25") was used. Observe the CPU socket after heat treatment. Next, the number of cracks generated in the CPU socket is measured. The same measurement was performed on the three CPU sockets, and the average of the three measured values was set as the number of crack generations. Table 1 shows the number of occurrences of cracks in the CPU sockets of Examples 1 to 3 and Comparative Examples 1 and 2. (3) Volume specific heat First, the specific heat capacity (unit: J/gK) of the liquid crystal polyester compositions used in Examples 1 to 3 and Comparative Examples 1 and 2 was measured by the method described in JIS K7123:2012. Specifically, a test piece (ASTM No. 4 dumbbell test piece) prepared from the liquid crystal polyester compositions used in Examples 1 to 3 and Comparative Examples 1 and 2 was used, and a differential scanning calorimeter (manufactured by Shimadzu Corporation) was used. "DSC-50"), the specific heat capacity (J/gK) at 100 ° C was measured. [0124] Next, a test piece (ASTM No. 4 dumbbell test piece) prepared from the liquid crystal polyester compositions used in Examples 1 to 3 and Comparative Examples 1 and 2 was used, and a solid specific gravity meter (manufactured by Kanto Measurement Co., Ltd., ASG-320K") Determination of density (g/cm ³ ). Using the measured specific heat capacity and density, the volume specific heat was calculated from the following formula. Table 1 shows the volume specific heat of the liquid crystal polyester compositions used in Examples 1 to 3 and Comparative Examples 1 and 2. Volume specific heat (J/cm ³ K) = specific heat capacity (J / gK) × density (g / cm ³ (4) Number average fiber length (after particle forming process) The liquid crystal polyester compositions of Examples 1 to 3 and Comparative Examples 1 and 2 which were formed into pellets by a 2-axis extruder were taken from 2 g to 坩埚. This was ashed in an electric furnace at 600 ° C for 4 hours to obtain a residue. The residue was dispersed in water, and the number average fiber length of the fibrous filler was measured using a moving image analysis method/particle analyzer PITA-3 (manufactured by SEISHIN Co., Ltd.). As the filtration conditions (analysis conditions), the aspect ratio is less than 2, and the circumscribed rectangular short diameter (fiber diameter) is less than 5 μm and exceeds 20 μm, and the thinned pixels (fiber length) are less than 20 μm as non-fibrous filler. Except for all. [0126] As shown in Table 1, in Example 1, 33.3 parts by mass of the fibrous filler having a measured value of the average fiber length of 70 μm and a hollow filler were used with respect to 100 parts by mass of the resin component (liquid crystal polyester). 33.3 parts by mass of the liquid crystal polyester composition. The liquid crystal polyester composition has a volume specific heat of 1.95 (J/cm). ³ K). On the other hand, in Comparative Example 2, 33.3 parts by mass and granular content of the fibrous filler having a measured value of the number average fiber length of less than 190 μm (measured value: 70 μm) was used with respect to 100 parts by mass of the liquid crystal polyester. 33.3 parts by mass of the liquid crystal polyester composition of the filler. The CPU socket of Comparative Example 2 has a larger amount of warpage after heating and a larger number of cracks than the CPU socket of the first embodiment. It is considered that the volume specific heat of the liquid crystal polyester composition of Comparative Example 2 is higher than that of the liquid crystal polyester composition of Example 1. From the results of Example 1 and Comparative Example 2, it was revealed that the volume specific heat of the CPU socket can be reduced by adding a hollow filler. Further, in Comparative Example 1, a liquid crystal polyester composition containing 66.7 parts by mass of a fibrous filler having a measured average number of fiber lengths of less than 190 μm (measured value: 70 μm) was used with respect to 100 parts by mass of the liquid crystal polyester. Things. As a result of the first embodiment and the comparative example 1, it was revealed that the amount of warpage and the number of occurrences of cracks in the CPU socket after heating can be reduced by adding the hollow filler. As described above, according to the present embodiment, it is shown that a connector capable of suppressing generation of cracks and having a small amount of warpage can be provided. [Industrial Applicability] According to the present invention, a liquid crystal polyester composition capable of forming a resin molded article excellent in crack resistance and warpage resistance, and a resin molded body using the same, particularly a connector Therefore, it is extremely useful in the industry.

[0132]

100‧‧‧Connector (CPU socket)

101‧‧‧ openings

102‧‧‧Outer frame

103‧‧‧Inside frame

104‧‧‧ pin insertion hole

201‧‧‧Minimum wall thickness

1A is a plan view showing the structure of a connector according to an embodiment of the present invention. Fig. 1B is a cross-sectional view taken along line A-A of Fig. 1A. Figure 2 is a partial enlarged view of Figure 1A.

Claims (7)

A liquid crystal polyester composition comprising a liquid crystal polyester, a hollow filler, and a fibrous filler having a number average fiber length of 20 μm or more and less than 190 μm. The liquid crystal polyester composition of claim 1, wherein the hollow filler has a coefficient average particle diameter of 5 μm or more and 100 μm or less. The liquid crystal polyester composition according to claim 1 or 2, wherein the fibrous filler has an average fiber diameter of 5 μm or more and 20 μm or less. The liquid crystal polyester composition according to any one of claims 1 to 3, wherein the liquid crystal polyester contains 30 mol% or more of the following structural units for the total of all repeating units of the liquid crystal polyester: . The liquid crystal polyester composition according to any one of claims 1 to 4, which has a volume specific heat at 100 ° C of 1.0 J/cm ³ K or more and 3.0 J/cm ³ K or less. A resin molded body formed by the liquid crystal polyester composition according to any one of claims 1 to 5. The resin molded body of claim 6, which is a connector.