Liquid crystal polyester composition, pellet, and molded article

Abstract

Provided is a liquid crystal polyester composition which has excellent flowability, and which is capable of forming a molded article having excellent mechanical properties (particularly tensile strength and tensile elongation), while exhibiting a low dielectric constant and a low dielectric loss tangent. A liquid crystal polyester composition containing a liquid crystal polyester and a polyaryletherketone, the liquid crystal polyester containing a first monomer unit having a condensed aromatic ring, the total content of the liquid crystal polyester and the polyaryletherketone being 80% by mass or more, and the content of the polyaryletherketone being 1-18 parts by mass per 100 parts by mass of the liquid crystal polyester.

Description

Technical Field

[0001] This disclosure relates to liquid crystal polyester compositions, granules, and molded articles. Background Technology

[0002] Liquid crystal polyester is used in a variety of applications due to its fluidity, heat resistance and high dimensional accuracy.

[0003] For example, Patent Document 1 describes a liquid crystal polymer composition that is formulated with a specified amount of specific flat glass fibers and a specific plate-shaped filler.

[0004] Existing technical documents Patent documents Patent Document 1: Japanese Patent Application Publication No. 2003-268252 Patent Document 2: Japanese Patent Application Publication No. 2000-19168 Patent Document 3: Japanese Patent No. 6439027 Summary of the Invention

[0005] The problem that the invention aims to solve In recent years, there has been a growing demand for improved mechanical properties due to the expansion into more diverse applications. However, existing methods struggle to improve mechanical properties (especially tensile strength and elongation) while maintaining the desirable characteristics of liquid crystal polyesters, such as low dielectric constant, low dielectric loss tangent, and high flowability.

[0006] The purpose of this disclosure is to provide a liquid crystal polyester composition with excellent flowability, which can be formed into molded articles exhibiting low dielectric constant and low dielectric loss tangent, and excellent mechanical properties (especially tensile strength and elongation). Furthermore, another purpose of this disclosure is to provide granules and molded articles comprising the above-described liquid crystal polyester composition.

[0007] means for solving problems This disclosure relates, for example, to the following [1] to [8].

[0008] [1] A liquid crystal polyester composition, It comprises liquid crystal polyester and polyaryletherketone, wherein the liquid crystal polyester contains a first monomer unit having a condensed aromatic ring, and the total content of the liquid crystal polyester and the polyaryletherketone is 80% by mass or more, and the content of the polyaryletherketone is 1 part by mass or more and 18 parts by mass or less relative to 100 parts by mass of the liquid crystal polyester.

[0009] [2] The liquid crystal polyester composition according to [1], wherein the aforementioned condensed aromatic ring is a naphthalene ring.

[0010] [3] The liquid crystal polyester composition according to [1] or [2], wherein the content of the first monomer unit is 40 mol% or more relative to the total of all monomer units constituting the liquid crystal polyester.

[0011] [4] The liquid crystal polyester composition according to any one of [1] to [3], wherein the liquid crystal polyester further comprises a second monomer unit containing a benzene ring but not a condensed aromatic ring.

[0012] [5] The liquid crystal polyester composition according to any one of [1] to [4], wherein the aforementioned polyaryletherketone is polyetheretherketone.

[0013] [6] The liquid crystal polyester composition according to any one of [1] to [5] has a sea-island structure comprising a sea portion containing the aforementioned liquid crystal polyester and a plurality of island portions containing the aforementioned polyaryl ether, wherein the average area of ​​the aforementioned island portions in the cross-section of the aforementioned sea-island structure is 25 μm. 2 the following.

[0014] [7] A granule comprising the liquid crystal polyester composition described in any one of [1] to [6].

[0015] [8] A molded article comprising the liquid crystal polyester composition described in any one of [1] to [6] The molded products include connectors, sockets, relay components, winding tubes, optical pickups, oscillators, semiconductor packages, IC trays, wafer carriers, household appliance components, lighting equipment components, audio product components, fiber optic cable ferrules, telephone components, fax machine components, modem components, release claws, heater brackets, impellers, fan gears, gears, bearings, motor components, motor housings, engine components, engine compartment components, electrical components, automotive interior components, microwave cooking pots, heat-resistant tableware, flooring materials, wall materials, beams, columns, roofing materials, aircraft components, spacecraft components, aerospace equipment components, nuclear reactors, marine facility components, washing fixtures, optical equipment components, valves, pipes, nozzles, filters, medical equipment components, medical materials, sensor components, hygiene supplies, and sporting or leisure products.

[0016] Invention Effects According to this disclosure, a liquid crystal polyester composition is provided, which has excellent flowability and can be formed into molded articles exhibiting low dielectric constant and low dielectric loss tangent, and excellent mechanical properties (especially tensile strength and elongation). Furthermore, according to this disclosure, granules and molded articles comprising the above-described liquid crystal polyester composition are provided. Attached Figure Description

[0017] Figure 1This is a diagram showing a cross-sectional SEM image of the liquid crystal polyester composition of Example 1-1.

[0018] Figure 2 This is a diagram showing a cross-sectional SEM image of the liquid crystal polyester composition of Examples 1-2.

[0019] Figure 3 This is a diagram showing a cross-sectional SEM image of the liquid crystal polyester composition of Example 2-1.

[0020] Figure 4 This is a SEM image showing a cross-section of the liquid crystal polyester composition of Comparative Example 2-1. Detailed Implementation

[0021] The preferred embodiments of this disclosure will now be described in detail.

[0022] The liquid crystal polyester composition of this embodiment (hereinafter also simply referred to as the "liquid crystal polyester composition") comprises a liquid crystal polyester and a polyaryletherketone. The liquid crystal polyester contains a first monomer unit having a condensed aromatic ring. The total content of the liquid crystal polyester and the polyaryletherketone in the liquid crystal polyester composition is 80% by mass or more. The content of the polyaryletherketone is 1 part by mass or more and 18 parts by mass or less relative to 100 parts by mass of the liquid crystal polyester.

[0023] The liquid crystal polyester composition of this embodiment, through a specific combination of liquid crystal polyester and polyaryletherketone, achieves excellent flowability, low dielectric constant of the molded article, low dielectric loss tangent of the molded article, and excellent mechanical properties (especially tensile strength and elongation) of the molded article. That is, the liquid crystal polyester composition of this embodiment exhibits excellent flowability; furthermore, according to the liquid crystal polyester composition of this embodiment, molded articles exhibiting low dielectric constant and low dielectric loss tangent, and excellent mechanical properties (especially tensile strength and elongation) can be formed.

[0024] In the liquid crystal polyester composition of this embodiment, the liquid crystal polyester has condensed aromatic rings, which exhibit good interaction with the aromatic rings of the polyaryletherketone. Therefore, it can be considered that in the liquid crystal polyester composition of this embodiment, the polyaryletherketone is easily dispersed as fine structural domains in the liquid crystal polyester matrix, thereby obtaining excellent mechanical properties (especially tensile strength and elongation) while maintaining the excellent properties of the liquid crystal polyester (flowability, low dielectric constant, and low dielectric loss tangent).

[0025] Liquid crystal polyesters are any polyesters that exhibit liquid crystal properties in the molten state. A liquid crystal polyester composition may contain only one type of liquid crystal polyester, or it may contain two or more types.

[0026] Liquid crystal polyesters have structural units (also called monomer units) derived from raw material monomers. Liquid crystal polyesters may have monomer units (e.g., monomer units comprising 90 mol% or more, 95 mol% or more, or 99 mol% or more of all monomer units, preferably all monomer units) derived from aromatic compounds. Liquid crystal polyesters in which all monomer units are derived from aromatic compounds are also called fully aromatic liquid crystal polyesters.

[0027] The liquid crystal polyester contains a first monomer unit having a condensed aromatic ring. The liquid crystal polyester may contain only one type of first monomer unit, or it may contain two or more types of first monomer units. The liquid crystal polyester may also contain a second monomer unit that does not contain a condensed aromatic ring but has a benzene ring. The liquid crystal polyester may contain only one type of second monomer unit, or it may contain two or more types of second monomer units.

[0028] The first monomer unit may be a monomer unit derived from an aromatic compound (1) having a condensed aromatic ring. In addition, the second monomer unit may be a monomer unit derived from an aromatic compound (2) containing a benzene ring but not a condensed aromatic ring.

[0029] It should be noted that, in this specification, "derived from" refers to a change in the chemical structure of the functional groups that facilitate polymerization in the monomer units of the liquid crystal polyester formed by the polymerization of the raw material monomers, without any other structural changes. Here, "derived from" also includes polymerizable derivatives derived from the raw material monomers (e.g., compounds obtained by converting the functional groups that facilitate polymerization in the raw material monomers into other polymerizable groups).

[0030] Examples of first monomer units include monomer units derived from aromatic hydroxycarboxylic acids (1-1) having condensed aromatic rings (hereinafter also referred to as monomer unit (1-1)), monomer units derived from aromatic dicarboxylic acids (1-2) having condensed aromatic rings (hereinafter also referred to as monomer unit (1-2)), and monomer units derived from aromatic diols (1-3) having condensed aromatic rings (hereinafter also referred to as monomer unit (1-3)).

[0031] Examples of second monomer units include monomer units derived from aromatic hydroxycarboxylic acids (2-1) (hereinafter also referred to as monomer unit (2-1)), monomer units derived from aromatic dicarboxylic acids (2-2) (hereinafter also referred to as monomer unit (2-2)), and monomer units derived from aromatic diols (2-3) (hereinafter also referred to as monomer unit (2-3)).

[0032] The condensed aromatic rings possessed by the first monomer unit can be categorized as naphthalene rings, anthracene rings, phenanthrene rings, tetraphenyl rings, pyrene rings, triphenylene rings, perylene rings, fluorene rings, etc. Among these, naphthalene rings are preferred from the perspective of availability and price.

[0033] Examples of monomer units in liquid crystal polyesters include, for example, the monomer unit shown in formula (I) below (hereinafter also referred to as monomer unit (I)), the monomer unit shown in formula (II) below (hereinafter also referred to as monomer unit (II)), and the monomer unit shown in formula (III) below (hereinafter also referred to as monomer unit (III)).

[0034] -O-Ar 1 -CO-…… (I) -CO-Ar 2 -CO- …… (II) -X-Ar 3 -Y-…… (III) [In the formula, Ar] 1 Ar 2 and Ar 3 Each group independently represents a phenylene group, a biphenyl group, a condensed polycyclic aromatic hydrocarbon group, or a group represented by formula (IV). Ar 1 Ar 2 and Ar 3 Some or all of the hydrogen atoms can be substituted with halogen atoms, alkyl groups, or aryl groups. X and Y each independently represent an oxygen atom or an imino group (-NH-). -Ar 4 -Z-Ar 5 -…… (IV) [In the formula, Ar] 4 and Ar 5 Each group independently represents a phenylene group or a condensed polycyclic aromatic hydrocarbon group. Z represents an oxygen atom, a sulfur atom, a carbonyl group, a sulfonyl group, or an alkyl diene group. The phenylene oxide can be 1,4-phenylene oxide or 1,3-phenylene oxide, preferably 1,4-phenylene oxide.

[0035] Biphenyl can be 4,4'-biphenyl.

[0036] A condensed polycyclic aromatic hydrocarbon group is a group in which two hydrogen atoms have been removed from a condensed polycyclic aromatic hydrocarbon. Examples of condensed polycyclic aromatic hydrocarbons include naphthalene, anthracene, phenanthrene, tetraphenylene, pyrene, triphenylene, perylene, and fluorene. Among these, naphthalene is preferred from the perspective of availability and price.

[0037] The condensed polycyclic aromatic hydrocarbon group can be naphthylene. For example, the naphthylene can be 1,3-naphthylene, 1,4-naphthylene, 1,5-naphthylene, 1,6-naphthylene, 1,7-naphthylene, 1,8-naphthylene, 2,4-naphthylene, 2,5-naphthylene, 2,6-naphthylene, or 2,7-naphthylene, preferably 2,6-naphthylene or 2,7-naphthylene, and more preferably 2,6-naphthylene.

[0038] Regarding halogen atoms that can be used as substituents, examples include fluorine, chlorine, bromine, and iodine atoms. The halogen atom used as a substituent can be a fluorine atom, a chlorine atom, or a bromine atom; it can also be a fluorine atom, a chlorine atom, or a fluorine atom.

[0039] The alkyl group used as a substituent can be straight-chain, branched, or cyclic. For example, the alkyl group can be an alkyl group having 1 to 10 carbon atoms. Examples of alkyl groups include methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, tert-butyl, n-hexyl, 2-ethylhexyl, n-octyl, and n-decyl.

[0040] The aryl group used as a substituent can be either monocyclic or condensed. For example, aryl groups can have 6 to 20 carbon atoms. Examples of aryl groups include phenyl, o-tolyl, m-tolyl, p-tolyl, 1-naphthyl, and 2-naphthyl. Aryl groups, such as tolyl, can be obtained by substituting an alkyl group for a hydrogen atom in the aromatic ring.

[0041] Ar 1 Ar 2 and Ar 3 The number of substituents can be, for example, 0 to 2, or 0 or 1, or even 0.

[0042] X and Y are preferably oxygen atoms.

[0043] The alkyl diene in Z can be straight-chain or branched. The alkyl diene can be an alkyl diene with 1 to 10 carbon atoms. Examples of alkyl dienes include methylene, ethane diene, propane diene (e.g., propane-2,2-diyl), butane diene, and octane diene (e.g., octane-3,3-diyl).

[0044] Z is preferably an oxygen atom, a sulfur atom, a methylene group, an ethanediyl group, or a propanediyl group, and more preferably an oxygen atom.

[0045] The first monomer unit can be the monomer unit (Ar) shown in equation (I). 1 For condensation of polycyclic aromatic hydrocarbon groups or Ar 4 and Ar 5 At least one of them is a group of formula (IV) consisting of a condensed polycyclic aromatic hydrocarbon group, or it can be a monomer unit of formula (II) consisting of an Ar group. 2For condensation of polycyclic aromatic hydrocarbon groups or Ar 4 and Ar 5 At least one of them is a group of formula (IV) consisting of a condensed polycyclic aromatic hydrocarbon group, or it can be a monomer unit of formula (III) consisting of an Ar group. 2 For condensation of polycyclic aromatic hydrocarbon groups or Ar 4 and Ar 5 At least one of them is a group of formula (IV) that is a condensed polycyclic aromatic hydrocarbon group.

[0046] The first monomer unit can be a monomer unit derived from an aromatic compound (1) having a condensed aromatic ring. Examples of aromatic compounds (1) include 2-hydroxy-6-naphthoic acid, 2,6-naphthoic acid, 2,6-dihydroxynaphthoic acid, 2-hydroxy-3-naphthoic acid, 1-hydroxy-5-naphthoic acid, 2,7-naphthodiol, etc.

[0047] The second monomer unit can be the monomer unit (Ar) shown in equation (I). 1 It is phenylene, biphenyl or Ar 4 and Ar 5 (It can be a group represented by formula (IV) of phenylene), or a monomer unit represented by formula (II) (Ar) 2 It is phenylene, biphenyl or Ar 4 and Ar 5 (The group is a phenylene group as shown in formula (IV), or it can be a monomer unit as shown in formula (III) (Ar) 3 It is phenylene, biphenyl or Ar 4 and Ar 5 (The group is a phenylene group represented by formula (IV)).

[0048] The second monomer unit can be a monomer unit derived from an aromatic compound (2) that has a benzene ring but not a condensed aromatic ring. Examples of aromatic compounds (2) include p-hydroxybenzoic acid, terephthalic acid, hydroquinone, isophthalic acid, 4,4'-biphenol, etc.

[0049] In liquid crystal polyesters, the content of the first monomer unit relative to the total number of monomer units constituting the liquid crystal polyester can, for example, be 20 mol% or more, 30 mol% or more, 40 mol% or more, 50 mol% or more, 60 mol% or more, or 70 mol% or more. If the content of the first monomer unit is high, there is a tendency for further improvement in dielectric properties. Furthermore, the content of the first monomer unit relative to the total number of monomer units constituting the liquid crystal polyester can, for example, be 90 mol% or less, 85 mol% or less, or 80 mol% or less. This tends to improve moldability and processability at low temperatures.

[0050] That is, the content of the first monomer unit relative to the total of all monomer units constituting the liquid crystal polyester can be, for example, 20 mol% or more and 90 mol% or less, 20 mol% or more and 85 mol% or less, 20 mol% or more and 80 mol% or less, 30 mol% or more and 90 mol% or less, 30 mol% or more and 85 mol% or less, 30 mol% or more and 80 mol% or less, 40 mol% or more and 90 mol% or less, 40 mol% or more and 85 mol% or less, 40 mol% or more and 80 mol% or less, 50 mol% or more and 90 mol% or less, 50 mol% or more and 85 mol% or less, 50 mol% or more and 80 mol% or less, 60 mol% or more and 90 mol% or less, 60 mol% or more and 85 mol% or more, 60 mol% or more and 80 mol% or less, 70 mol% or more and 90 mol% or more and 70 mol% or more and 85 mol% or more.

[0051] In the liquid crystal polyester, the content of the second monomer unit relative to the total number of monomer units constituting the liquid crystal polyester can, for example, be 10 mol% or more, 15 mol% or more, or 20 mol% or more. Furthermore, the content of the second monomer unit relative to the total number of monomer units constituting the liquid crystal polyester can, for example, be 80 mol% or less, 70 mol% or less, 60 mol% or less, 50 mol% or less, 40 mol% or less, or 30 mol% or less.

[0052] That is, the content of the second monomer unit can be, for example, 10 mol% or more and 80 mol% or less, 10 mol% or more and 70 mol% or less, 10 mol% or more and 60 mol% or less, 10 mol% or more and 50 mol% or less, 10 mol% or more and 40 mol% or less, 10 mol% or more and 30 mol% or less, 15 mol% or more and 80 mol% or less, 15 mol% or more and 70 mol% or less, 15 mol% or more and 60 mol% or less, 15 mol% or more and 50 mol% or less, 15 mol% or more and 40 mol% or less, 15 mol% or more and 30 mol% or less.

[0053] In liquid crystal polyester, the total amount of the first monomer unit and the second monomer unit relative to the total amount of all monomer units constituting the liquid crystal polyester can be, for example, 90 mol% or more, 95 mol% or more, 99 mol% or more, or 100 mol%.

[0054] Liquid crystal polyester can be a polymer having two or more monomer units (I), or a polymer having monomer units (I), monomer units (II) and monomer units (III).

[0055] When the liquid crystal polyester has monomer units (I), monomer units (II), and monomer units (III), the content of monomer unit (I) is the total of all monomer units of the liquid crystal polyester, for example, it can be 30 mol% or more, 40 mol% or more, 45 mol% or more, 50 mol% or more, or 55 mol% or more. Furthermore, when the liquid crystal polyester has monomer units (I), monomer units (II), and monomer units (III), the content of monomer unit (I) is the total of all monomer units of the liquid crystal polyester, for example, it can be 80% or less, or 70% or less.

[0056] That is, when the liquid crystal polyester has monomer units (I), monomer units (II) and monomer units (III), the content of monomer units (I) relative to the total of all monomer units of the liquid crystal polyester can be, for example, 30 mol% or more and 80 mol% or less, 30 mol% or more and 70 mol% or less, 40 mol% or more and 80 mol% or less, 40 mol% or more and 70 mol% or less, 45 mol% or more and 80 mol% or less, 45 mol% or more and 70 mol% or less, 50 mol% or more and 80 mol% or less, 50 mol% or more and 70 mol% or less, 55 mol% or more and 80 mol% or less, or 55 mol% or more and 70 mol% or less.

[0057] When the liquid crystal polyester has monomer units (I), monomer units (II), and monomer units (III), the content of monomer unit (II) and the content of monomer unit (III) relative to the total of all monomer units of the liquid crystal polyester can be, for example, less than 35 mol% or less, or less than 30 mol%. Furthermore, when the liquid crystal polyester has monomer units (I), monomer units (II), and monomer units (III), the content of monomer unit (II) and the content of monomer unit (III) relative to the total of all monomer units of the liquid crystal polyester can be, for example, more than 5 mol%, more than 10 mol%, or more than 15 mol%.

[0058] That is, when the liquid crystal polyester has monomer units (I), monomer units (II) and monomer units (III), the content of monomer unit (II) and the content of monomer unit (III) are respectively relative to the total of all monomer units of the liquid crystal polyester, for example, they can be more than 5 mol% and less than 35 mol%, more than 5 mol% and less than 30 mol%, more than 10 mol% and less than 35 mol%, more than 10 mol% and less than 30 mol%, more than 15 mol% and less than 35 mol%, or more than 15 mol% and less than 30 mol%.

[0059] Liquid crystal polyesters may have monomer units other than monomer units (I), monomer units (II) and monomer units (III), and their content relative to the total of all monomer units of the liquid crystal polyester may be less than 10 mol%, less than 5 mol%, less than 2 mol%, less than 1 mol%, or 0 mol%.

[0060] In a suitable embodiment, the liquid crystal polyester may contain at least one monomer unit selected from the group consisting of monomer units (1-1) derived from 2-hydroxy-6-naphthoic acid and monomer units (1-2) derived from 2,6-naphthoic acid as a first monomer unit. The liquid crystal polyester may contain only one of monomer unit (1-1) and monomer unit (1-2), or it may contain both.

[0061] When the liquid crystal polyester contains monomer units (1-1), the content of monomer units (1-1) relative to the total number of monomer units in the liquid crystal polyester can, for example, be 20 mol% or more, or 30 mol% or more, 40 mol% or more, or 50 mol% or more. Furthermore, the content of monomer units (1-1) in the liquid crystal polyester relative to the total number of monomer units in the liquid crystal polyester can, for example, be 80 mol% or less, or 75 mol% or less, 70 mol% or less, or 65 mol% or less.

[0062] When the liquid crystal polyester contains monomer units (1-1), the percentage of monomer units (1-1) in the first monomer unit can be, for example, 40 mol% or more, or 50 mol% or more, 60 mol% or more, or 70 mol% or more. Furthermore, the percentage of monomer units (1-1) in the first monomer unit can be, for example, 100 mol% or less, or 99 mol% or less, 90 mol% or less, 85 mol% or less, 80 mol% or less, or 78 mol% or less.

[0063] When the liquid crystal polyester contains monomer units (1-2), the content of monomer units (1-2) relative to the total number of monomer units in the liquid crystal polyester can, for example, be 1 mol% or more, or 5 mol% or more, 10 mol% or more, or 15 mol% or more. Furthermore, the content of monomer units (1-2) in the liquid crystal polyester relative to the total number of monomer units in the liquid crystal polyester can, for example, be 50 mol% or less, or 40 mol% or less, 30 mol% or less, or 25 mol% or less.

[0064] When the liquid crystal polyester contains monomer units (1-2), the percentage of monomer units (1-2) in the first monomer unit can be, for example, 1 mol% or more, or 10 mol% or more, 15 mol% or more, or 20 mol% or more. Furthermore, the percentage of monomer units (1-2) in the first monomer unit can be, for example, 100 mol% or less, or 60 mol% or less, 50 mol% or less, 40 mol% or less, or 30 mol% or less.

[0065] In a suitable embodiment, the liquid crystal polyester may contain a second monomer unit selected from at least one of the group consisting of a monomer unit (2-1) derived from hydroquinone and a monomer unit (2-2) derived from terephthalic acid. The liquid crystal polyester may contain only one of the monomer unit (2-1) and the monomer unit (2-2), or it may contain both.

[0066] When the liquid crystal polyester contains monomer units (2-1), the content of monomer units (2-1) relative to the total number of monomer units in the liquid crystal polyester can, for example, be 0.1 mol% or more, or 1 mol% or more, or 8 mol% or more, or 15 mol% or more. Furthermore, the content of monomer units (2-1) in the liquid crystal polyester relative to the total number of monomer units in the liquid crystal polyester can, for example, be 40 mol% or less, or 35 mol% or less, 30 mol% or less, or 25 mol% or less.

[0067] When the liquid crystal polyester contains monomer units (2-1), the percentage of monomer units (2-1) in the second monomer unit can be, for example, 5 mol% or more, or 10 mol% or more, 30 mol% or more, 50 mol% or more, 60 mol% or more, or 70 mol% or more. Furthermore, the percentage of monomer units (2-1) in the second monomer unit can be, for example, 100 mol% or less, or 99 mol% or less, 98 mol% or less, 97 mol% or less, 95 mol% or less, 90 mol% or less, or 85 mol% or less.

[0068] When the liquid crystal polyester contains monomer units (2-2), the content of monomer units (2-2) relative to the total number of monomer units in the liquid crystal polyester can, for example, be 0.1 mol% or more, or 1 mol% or more, 2 mol% or more, or 3 mol% or more. Furthermore, the content of monomer units (2-2) in the liquid crystal polyester relative to the total number of monomer units in the liquid crystal polyester can, for example, be 50 mol% or less, or 30 mol% or less, 20 mol% or less, or 10 mol% or less.

[0069] When the liquid crystal polyester contains monomer units (2-2), the percentage of monomer units (2-2) in the second monomer unit can be, for example, 1 mol% or more, or 2 mol% or more, 3 mol% or more, 5 mol% or more, 10 mol% or more, or 15 mol% or more. Furthermore, the percentage of monomer units (2-2) in the second monomer unit can be, for example, 100 mol% or less, or 95 mol% or less, 90 mol% or less, 70 mol% or less, 50 mol% or less, 40 mol% or less, or 30 mol% or less.

[0070] In this specification, the number of each monomer unit in the liquid crystal polyester can be determined by the analytical method described in Japanese Patent Application Publication No. 2000-19168. Specifically, by depolymerizing the liquid crystal polyester by reacting it with a lower alcohol in a supercritical state, and by quantifying the depolymerization products (monomers from which each monomer unit is derived) using liquid chromatography, the number of each monomer unit relative to the total number of monomer units can be calculated.

[0071] Liquid crystal polyesters can be manufactured by polymerizing raw material monomers corresponding to the monomer units constituting them. For example, they can be manufactured according to the method described in Japanese Patent No. 6439027.

[0072] The flow initiation temperature of the liquid crystal polyester can be, for example, above 250°C or above 270°C. Furthermore, the flow initiation temperature of the liquid crystal polyester can be, for example, below 400°C, below 360°C, or below 340°C.

[0073] That is, the flow start temperature of the liquid crystal polyester can be, for example, above 250°C and below 400°C, above 250°C and below 360°C, above 250°C and below 340°C, above 270°C and below 400°C, above 270°C and below 360°C, or above 270°C and below 340°C.

[0074] In this specification, the flow initiation temperature of the liquid crystal polyester is determined using a flow meter, with the liquid crystal polyester flowing at 9.8 MPa (100 kg / cm³). 2Under a load of 4℃ / min, the liquid crystal polyester was heated and melted, and extruded from a nozzle with an inner diameter of 1mm and a length of 10mm. The viscosity of the liquid crystal polyester was 4800Pa·s (48000 poise).

[0075] The dielectric loss tangent of the liquid crystal polyester at 10 GHz can be, for example, 0.002 or less, preferably 0.0015 or less, and more preferably 0.001 or less. Therefore, it becomes easy to obtain a composition having a suitable dielectric loss tangent as described later.

[0076] The relative permittivity of the liquid crystal polyester at 10 GHz can be, for example, 4.0 or less, or 3.8 or less. Furthermore, the relative permittivity of the liquid crystal polyester at 10 GHz can be, for example, 2.5 or more.

[0077] In this specification, the dielectric loss tangent and relative permittivity of the liquid crystal polyester at 10 GHz were measured using a vector network analyzer (N5290A manufactured by Keysight Technologies Inc.) and a split cylindrical resonator (CR710 manufactured by EM labs Inc.). It should be noted that the measurement environment was 23°C and 50%RH.

[0078] The content of liquid crystal polyester, based on the total amount of the liquid crystal polyester composition, can be, for example, 60% by mass or more, or 70% by mass or more, 80% by mass or more, 85% by mass or more, or 90% by mass or more. Furthermore, the content of liquid crystal polyester, based on the total amount of the liquid crystal polyester composition, can be, for example, 99% by mass or less, or 98% by mass or less.

[0079] Polyaryletherketones have a structure in which multiple arylene groups are bonded together by linking groups, and can be shown as polymers in which part of the linking group is an ether group (-O-) and the rest of the linking group is a carbonyl group (-CO-).

[0080] Polyaryletherketones may, for example, have repeating units (A-1) as shown in formula (A-1) and repeating units (A-2) as shown in formula (A-2).

[0081] -Ar 11 -O-…… (A-1) -Ar 12 -CO- …… (A-2) [In the formula, Ar] 11 and Ar 12 Each represents a subaryl group independently. Ar 11 and Ar 12The arylene group in the arylene group can be, for example, 1,4-phenylene, 1,3-phenylene, 4,4'-biphenyl, etc., preferably 1,4-phenylene.

[0082] Examples of polyaryletherketones include polyetherketones having repeating units (B-1) as shown in formula (B-1), polyetheretherketones having repeating units (B-2) as shown in formula (B-2), polyetherketones having repeating units as shown in formula (B-3), and polyetheretherketones having repeating units as shown in formula (B-4). From the perspective of further improving the mechanical properties of the molded article (especially tensile strength and elongation), polyetheretherketones are preferred.

[0083] -Ar 21 -O-Ar 22 -CO-……(B-1) -Ar 21 -O-Ar 22 -O-Ar 23 -CO-……(B-2) -Ar 21 -O-Ar 22 -CO-Ar 23 -CO-……(B-3) -Ar 21 -O-Ar 22 -O-Ar 23 -CO-Ar 24 -CO- …… (B-4) [In the formula, Ar] 21 Ar 22 Ar 23 and Ar 24 Each represents a subaryl group independently. Ar 21 Ar 22 Ar 23 and Ar 24 The arylene group in the arylene group can be, for example, 1,4-phenylene, 1,3-phenylene, 4,4'-biphenyl, etc., preferably 1,4-phenylene.

[0084] The melting point of polyaryletherketones (PAEs) can be, for example, above 300°C, above 320°C, or above 330°C. If the melting point of PAEs is high, there is a tendency for further improvement in mechanical properties (especially tensile strength and elongation). The melting point of PAEs can be, for example, below 380°C, below 360°C, or below 350°C. If the melting point of PAEs is low, there is a tendency for further improvement in processability.

[0085] Viscosity of polyaryletherketone (400℃, 1000s)-1 For example, the viscosity can be below 500 Pa·s, or below 450 Pa·s, 400 Pa·s, 350 Pa·s, 300 Pa·s, 200 Pa·s, or 150 Pa·s. If the viscosity is low, there is a tendency for the dispersibility of the polyarylether ketone in the liquid crystal polyester composition to be further improved. The viscosity of the polyarylether ketone (400°C, 1000 s⁻¹) -1 For example, it can be above 1 Pa·s, or above 10 Pa·s, above 30 Pa·s, or above 50 Pa·s. If the viscosity is high, there is a tendency for the mechanical properties (especially tensile strength and elongation) to be further improved.

[0086] In this specification, the viscosity of polyaryletherketone is measured as follows: using a capillary rheometer (Capilograph 1D manufactured by Toyo Seiki Co., Ltd.), a capillary with an inner diameter of 0.5 mm and a length of 10 mm is installed at the tip of the barrel. The granules to be measured are melted in the barrel heated to 400°C and extruded from the nozzle. The measurement is performed under a shear rate of 1000 / second.

[0087] The content of polyaryletherketone is 1 part by mass or more relative to 100 parts by mass of liquid crystal polyester. From the perspective of obtaining the above-mentioned effect more significantly, it can be 1.5 parts by mass or more, or 2 parts by mass or more. Furthermore, the content of polyaryletherketone is 18 parts by mass or less relative to 100 parts by mass of liquid crystal polyester. From the perspective of obtaining the above-mentioned effect more significantly, it can be 16 parts by mass or less, 14 parts by mass or less, 12 parts by mass or less, 11 parts by mass or less, or 10 parts by mass or less.

[0088] In the liquid crystal polyester composition, the total content of liquid crystal polyester and polyaryletherketone is 80% by mass or more, and from the perspective of more significantly obtaining the above-mentioned effects, it can be 85% by mass or more, 90% by mass or more, 95% by mass or more, or 97% by mass or more. In the liquid crystal polyester composition, the total content of liquid crystal polyester and polyaryletherketone can be 100% by mass.

[0089] The liquid crystal polyester composition can have a sea-island structure, comprising a sea portion containing the liquid crystal polyester and multiple island portions containing polyaryl ethers. In such a liquid crystal polyester composition, the polyaryl ether ketone is dispersed efficiently as fine structural domains within the liquid crystal polyester matrix. This liquid crystal polyester composition exhibits excellent mechanical properties (particularly tensile strength and elongation) and excellent stability of these mechanical properties. The sea-island structure can be observed through a cross-section of the liquid crystal polyester composition.

[0090] It should be noted that the stability of mechanical properties (especially tensile strength and tensile elongation) can be evaluated using the coefficient of variation shown in the following formula. In the following formula, n represents the number of measurements, xi represents each measurement result, and x represents the average value of the measurement results. Furthermore, Σ represents the summation over all measurement results. Additionally, ^(1 / 2) represents raising the total to the power of 1 / 2. The number of measurements n is preferably 5 or more.

[0091] Coefficient of variation = Standard deviation of specimen / Mean Specimen standard deviation = {1 / (n-1)Σ(xi-x)} 2}^(1 / 2) In the cross-section of the liquid crystal polyester composition, the average area of ​​the islands can be, for example, 25 μm. 2 From the perspective of achieving the above effects more significantly, 20μm can also be used. 2 Below, 15μm 2 Below, 12μm 2 Below or 10μm 2 Furthermore, the average area of ​​the islands in the cross-section of the liquid crystal polyester composition can, for example, be 0.1 μm. 2 From the perspective of production efficiency, the above can also be expressed as 0.3μm. 2 Above or 0.5μm 2 above.

[0092] The average area of ​​the islands can be adjusted, for example, by the degree of polymerization of the liquid crystal polyester (viscosity, flow initiation temperature), the viscosity of the polyaryletherketone, the viscosity ratio of the liquid crystal polyester to the polyaryletherketone, the shape of the sample before granulation, and the granulation conditions. For example, if the degree of polymerization of the liquid crystal polyester increases (i.e., the viscosity and flow initiation temperature increase), there is a tendency for the average area of ​​the islands to decrease. Furthermore, for example, if the viscosity of the polyaryletherketone decreases, there is a tendency for the average area of ​​the islands to decrease. Furthermore, for example, the closer the viscosity ratio of the liquid crystal polyester to the polyaryletherketone is to 1, the smaller the average area of ​​the islands tends to be. Furthermore, for example, if the sample shape before granulation is small and the mixing strength during granulation is high, there is a tendency for the average area of ​​the islands in the granulated liquid crystal polyester composition to decrease.

[0093] In this specification, the average area of ​​the island is measured using the following method.

[0094] (1) Preparation of samples for SEM measurement The granules of the test object (liquid crystal polyester composition) were cut along a plane perpendicular to the molding direction to expose the cross-section (applied by: Leica Microtome SP1600). Next, the sides of the granules were sanded down to near the center. Then, a slicer was used to expose the surface with a cross-section width of 1 mm (applied by: Leica Ultramicrotome EM UC6). Next, the 1 mm wide cross-section was ground to form the test surface (applied by: JEOL Cross Section Polisher SM-09010; grinding conditions: liquid nitrogen cooling (below -100°C), accelerating voltage 6 kV, processing time 8 hours, using Ar gas). Next, the test object was fixed on a SEM sample stage with carbon tape and osmium was coated (applied by: Neoc osmium coating machine manufactured by MEIWAFOSIS CO., LTD.; coating time: 3 seconds) to obtain the sample for SEM measurement.

[0095] (2) SEM capture and image analysis The measurement surface of the sample used for SEM measurement was observed using a scanning electron microscope (SEM, Hitachi High Technology Co., Ltd. S-4800), and SEM images were obtained. Specifically, the observation conditions were set to an accelerating voltage of 15 kV, a working distance (WD) of 15 mm, and a magnification of 500x (image resolution 198.4375 nm / pixel) to observe the reflected electron image based on the YAG detector, thereby obtaining the SEM image. It should be noted that during the process of obtaining the SEM image, before inserting the YAG detector, the focus was manually adjusted to make the secondary electron image clearer, and after inserting the YAG detector, the contrast was manually adjusted to make the reflected electron image clearer.

[0096] Image analysis was performed on the obtained SEM images. Specifically, ImageJ FIJI (ver 2.9.0 / 1.53t) was used. First, the SEM images were read, and only the areas showing the measurement plane were cut out. The cut-out images were then processed with a sigma2 Gaussian filter. Next, the Gaussian-filtered images were automatically segmented using default conditions to obtain duotone images. The background of the duotone images was set to black. To remove minor noise remaining in the duotone images, they were reduced in size twice and then enlarged twice. Finally, hole-filling processing was performed on the duotone images.

[0097] Since the resulting duotone image has no length unit, a length unit is assigned. Specifically, SetScale is initiated, Distance in pixels is set to 1, Known distance is set to the length of a single pixel (e.g., 0.1984375 μm / pixel in this example), Pixel aspect ratio is set to 1, and Unit of length is set to the unit of length (e.g., μm in this example).

[0098] Particle analysis was performed on the processed duotone image to determine the area of ​​the islands. During the measurement, the measurement size was set to 0-Infinity, the roundness to 0.00-1.00, the display to Nothing, and the results to Display results. This yielded the area of ​​each island within the image's field of view. Based on the obtained island areas, the average island area was obtained through arithmetic averaging.

[0099] The liquid crystal polyester composition may also contain other components besides the liquid crystal polyester and polyaryletherketone.

[0100] For example, the liquid crystal polyester composition may contain one or more resins other than liquid crystal polyester and polyaryletherketone. Examples of such resins include polyolefins, cyclic polyolefins, polyvinyl chloride, polysulfone, (meth)acrylic resins, polyphenylene ether resins, polyacetal resins, polyamide resins, imide resins, cellulose resins, polyetheretherketone resins, fluoropolymers, polycarbonate resins, thermosetting resins, etc.

[0101] In addition, the liquid crystal polyester composition may also include inorganic fillers, colorants, dispersants, plasticizers, antioxidants, curing agents, flame retardants, heat stabilizers, ultraviolet absorbers, antistatic agents, surfactants, lubricants, release agents, etc.

[0102] Liquid crystal polyester compositions can be manufactured, for example, by melt blending liquid crystal polyester and polyarylether ketone (and other components as needed). The melt blending method is not particularly limited and can be any known blending method. Melt blending can be carried out, for example, using known equipment such as a twin-screw extruder.

[0103] When manufacturing liquid crystal polyester compositions, polyaryletherketones (PAEs) can be in various shapes, such as granules or pellets. From the perspective of easily forming an island structure in which the PAEs are well dispersed within the liquid crystal polyester, granules are preferred. It can be considered that by using granules, the PAEs are effectively mixed even in low-viscosity liquid crystal polyesters, resulting in good dispersion.

[0104] The flow initiation temperature of the liquid crystal polyester composition can be, for example, 250°C or higher, or 270°C or higher. Furthermore, the flow initiation temperature of the liquid crystal polyester composition can be, for example, 400°C or lower, 360°C or lower, or 340°C or lower.

[0105] That is, the flow start temperature of the liquid crystal polyester composition can be, for example, above 250°C and below 400°C, above 250°C and below 360°C, above 250°C and below 340°C, above 270°C and below 400°C, above 270°C and below 360°C, or above 270°C and below 340°C.

[0106] The dielectric loss tangent of the liquid crystal polyester composition at 10 GHz can be, for example, 0.002 or less, preferably 0.0015 or less, and more preferably 0.001 or less.

[0107] The relative permittivity of the liquid crystal polyester composition at 10 GHz can be, for example, 4.0 or less, or 3.8 or less. Alternatively, the relative permittivity of the liquid crystal polyester composition at 10 GHz can be, for example, 2.5 or more, or 2.8 or more.

[0108] Viscosity of the liquid crystal polyester composition (340℃, 1000s) -1 For example, it can be below 500 Pa·s, or below 300 Pa·s, 200 Pa·s, 100 Pa·s, or 90 Pa·s. The viscosity of the liquid crystal polyester composition (340℃, 1000s) -1 For example, it can be 1 Pa·s or more, or 5 Pa·s or more, 10 Pa·s or more, 20 Pa·s or more, 30 Pa·s or more, 40 Pa·s or more, 45 Pa·s or more, or 47 Pa·s or more.

[0109] It should be noted that the flow onset temperature, dielectric loss tangent, and relative permittivity of the liquid crystal polyester composition were measured using the same methods as those used for the liquid crystal polyester. Furthermore, the viscosity of the liquid crystal polyester composition was measured using the same methods as those used for the viscosity of the polyaryletherketone, except for the measurement temperature.

[0110] Liquid crystal polyester compositions are suitable for use as molding materials due to their excellent melt flowability. For example, they can be used as granules.

[0111] The molded articles of this embodiment comprise the above-described liquid crystal polyester composition. The molded articles of this embodiment can be connectors, sockets, relay components, winding tubes, optical pickups, oscillators, semiconductor packages, IC trays, wafer carriers, household appliance components, lighting equipment components, audio product components, optical cable ferrules, telephone components, fax machine components, modem components, release claws, heater brackets, impellers, fan gears, gears, bearings, electric motor components, electric motor housings, engine components, engine compartment components, electrical components, automotive interior components, microwave cooking pots, heat-resistant tableware, flooring materials, wall materials, beams, columns, roofing materials, aircraft components, spacecraft components, aerospace equipment components, nuclear reactors, marine facility components, washing fixtures, optical equipment components, valves, pipes, nozzles, filters, medical equipment components, medical materials, sensor components, hygiene products, sporting goods, or leisure products.

[0112] The molded article of this embodiment can be obtained, for example, by molding the above-described liquid crystal polyester composition into the desired shape and performing processing as needed.

[0113] As a molding method for molded products, melt molding is preferred. Examples of melt molding methods include injection molding, extrusion molding, compression molding, blow molding, vacuum molding, foam molding, and compression molding.

[0114] The preferred embodiments of this disclosure have been described above, but this disclosure is not limited to the above embodiments.

[0115] Example The following examples illustrate the technical solutions of this disclosure in more detail, but the technical solutions of this disclosure are not limited to these examples. Hereinafter, the percentage (%) and part (%) of content or dosage are used as mass references unless otherwise specified.

[0116] (Example 1-1) (1) Manufacturing of liquid crystal polyester (LCP1) Liquid crystal polyester (LCP1) is obtained by the following method.

[0117] 1035.0 g (5.5 mol) of 2-hydroxy-6-naphthoic acid, 378.3 g (1.75 mol) of 2,6-naphthalenedicarboxylic acid, 83.1 g (0.5 mol) of terephthalic acid, 255.2 g of hydroquinone, 1226.87 g (12 mol) of acetic anhydride, and 0.17 g of 1-methylimidazole as a catalyst were added to a reactor equipped with a stirrer, torque meter, nitrogen inlet pipe, thermometer, and reflux condenser. After the reactor was fully purged with nitrogen, the temperature was raised to 140°C over a nitrogen flow for 1 hour and maintained at that temperature under reflux for 1 hour. Then, while distilling off the distilled byproduct acetic acid, the temperature was raised to 310°C over 4 hours and 35 minutes. The reaction was considered complete when the torque increased, and the contents were removed. The flow temperature of the resulting solid component was 270°C. The obtained solid component was cooled to room temperature, pulverized using a coarse pulverizer, and then heated from room temperature to 250°C over 1 hour under a nitrogen atmosphere, followed by a further heating from 250°C to 286°C over 7 hours and 40 minutes. The temperature was maintained at 286°C for 6 hours to advance the polymerization reaction in the solid layer, yielding liquid crystal polyester (LCP1). The flow temperature (flow onset temperature) of the obtained liquid crystal polyester (LCP1) was 311°C.

[0118] (2) Preparation of polyaryletherketone (P1) As polyaryletherketone (P1), 90g of polyetheretherketone manufactured by Victrex (PEEK, viscosity: 107 Pa·s, granular form) was prepared.

[0119] (3) Manufacturing of liquid crystal polyester composition The liquid crystal polyester composition and granules are manufactured according to the following method.

[0120] Liquid crystal polyester (LCP1) and polyaryletherketone (P1) were mixed at a mass ratio of 97:3 and granulated using a twin-screw extruder (PCM-30 manufactured by Ikegai Iron Works Co., Ltd.) at a barrel temperature of 340°C to obtain granules of the liquid crystal polyester composition. The flow onset temperature of the obtained granules was measured, and the results are shown in Table 1.

[0121] (4) Evaluation of liquid crystal polyester composition The liquid crystal polyester composition and molded articles were evaluated using the following methods. The results are shown in Table 1.

[0122] (i) Determination of tensile strength and tensile elongation Using a 500×500 high-temperature vacuum pressing device KVHC-II manufactured by Kitagawa Seiki Co., Ltd., and a mold with a thickness of 0.3 mm, granules were vacuum pressed at a temperature of +30°C (flow start temperature), a set pressure of 3 MPa, and a vacuum degree of less than 2 kPa to produce molded products. The molded products were punched into 9×56 mm strips. Tensile strength and elongation were measured using an Autograph AG-IS manufactured by Shimadzu Corporation, with a chuck spacing of 30 mm, a stretching speed of 5 mm / min, and n=6. The average value and standard deviation were calculated, and the coefficient of variation (standard deviation / average value) was determined. The measurements were conducted at 23°C and 50% RH.

[0123] (ii) Dielectric measurement The relative permittivity and dielectric loss tangent were determined using a vector network analyzer (N5290A, manufactured by Keysight Technologies Inc.) and a split cylindrical resonator (CR710, manufactured by EM labs Inc.). Measurements were performed at 23°C and 50% RH.

[0124] (iii) SEM image and average area of ​​islands SEM images of the granular cross-section were obtained using the method described above. If an island structure was identified in the SEM image, the average area of ​​the island was calculated using the same method.

[0125] (Examples 1-2) The mixing ratio of liquid crystal polyester (LCP1) to polyaryletherketone (P1) was changed to 93:7 (mass ratio), and the liquid crystal polyester composition was prepared and evaluated in the same manner as in Examples 1-1. The results are shown in Table 1.

[0126] (Examples 1-3) The mixing ratio of liquid crystal polyester (LCP1) to polyaryletherketone (P1) was changed to 86:14 (mass ratio), and the liquid crystal polyester composition was prepared and evaluated in the same manner as in Examples 1-1. The results are shown in Table 1.

[0127] (Comparative Example 1-1) Without the addition of polyaryletherketone (P1), only liquid crystal polyester (LCP1) was used to prepare and evaluate the liquid crystal polyester composition, otherwise the procedure was the same as in Examples 1-1. The results are shown in Table 1.

[0128] (Comparative Example 2-1) The mixing ratio of liquid crystal polyester (LCP1) to polyaryletherketone (P1) was changed to 80:20 (mass ratio), and the liquid crystal polyester composition was prepared and evaluated in the same manner as in Examples 1-1. The results are shown in Table 1.

[0129] Figure 1 This is a diagram showing a cross-sectional SEM image of the liquid crystal polyester composition of Example 1-1. Figure 2 This is a diagram showing a cross-sectional SEM image of the liquid crystal polyester composition of Examples 1-2.

[0130] As shown in Table 1, it was confirmed from Examples 1-1 to 1-3 that the combination of liquid crystal polyester and polyaryletherketone (PAK) exhibits excellent flowability, resulting in molded articles displaying low dielectric constant and low dielectric loss tangent, as well as excellent mechanical properties (especially tensile strength and elongation). In contrast, Comparative Example 1-1, lacking PAK, failed to obtain sufficient tensile strength. Furthermore, Comparative Example 1-2, with an excessive amount of PAK, suffered from insufficient flowability and also failed to obtain sufficient tensile strength.

[0131] Furthermore, in Example 1-1 (the average area of ​​the island is 5.7 μm), 2 Examples 1-2 (average island area is 8.8 μm) 2 ) and Examples 1-3 (the average area of ​​the island is 15.2 μm) 2 (This is in contrast to Example 2-1 described later, where the average area of ​​the island is 24.6 μm.) 2 Compared to [previous composition], the coefficients of variation for tensile strength and tensile elongation are smaller. This result confirms that liquid crystal polyester compositions with smaller average island areas can achieve more stable mechanical properties.

[0132] (Example 2-1) (1) Manufacturing of liquid crystal polyester (LCP2) Liquid crystal polyester (LCP2) is obtained by the following method.

[0133] The same procedure was followed as in the preparation of (1) liquid crystal polyester (LCP1) in Example 1-1 to obtain a solid component. The flow temperature of the obtained solid component was 270°C. The obtained solid component was cooled to room temperature, pulverized with a coarse pulverizer, and then heated from room temperature to 250°C in 1 hour under a nitrogen atmosphere, and from 250°C to 280°C in 5 hours. The temperature was maintained at 280°C for 6 hours to advance the polymerization reaction in the solid layer, thereby obtaining liquid crystal polyester (LCP2). The flow temperature (flow start temperature) of the obtained liquid crystal polyester (LCP2) was 301°C.

[0134] (2) Manufacturing and evaluation of liquid crystal polyester compositions The liquid crystal polyester composition was prepared and evaluated using liquid crystal polyester (LCP2) instead of liquid crystal polyester (LCP1), with the mixing ratio changed to liquid crystal polyester (LCP2):polyaryletherketone (P1) = 93:7 (mass ratio). Otherwise, the procedure was the same as in Examples 1-1. The results are shown in Table 2.

[0135] (Comparative Example 2-1) Without the addition of polyaryletherketone (P1), only liquid crystal polyester (LCP2) was used to prepare and evaluate the liquid crystal polyester composition, otherwise the procedure was the same as in Example 2-1. The results are shown in Table 2.

[0136] Figure 3 This is a diagram showing a cross-sectional SEM image of the liquid crystal polyester composition of Example 2-1. Figure 4 This is a SEM image showing a cross-section of the liquid crystal polyester composition of Comparative Example 2-1.

[0137] As shown in Table 2, it was confirmed that Example 2-1 achieved superior tensile strength and elongation compared to Comparative Example 2-1. Through the combination of liquid crystal polyester and polyaryletherketone, excellent flowability was achieved, and molded articles exhibiting low dielectric constant and low dielectric loss tangent, as well as excellent mechanical properties (especially tensile strength and elongation) could be realized.

[0138] (Example 3-1) (1) Preparation of polyaryletherketone (P2) As polyaryletherketone (P2), Victrex-manufactured polyetheretherketone 90P (PEEK, viscosity: 119 Pa·s, granular) was prepared.

[0139] (2) Manufacturing and evaluation of liquid crystal polyester compositions The liquid crystal polyester composition was prepared and evaluated by replacing polyaryletherketone (P1) with polyaryletherketone (P2) and changing the mixing ratio of liquid crystal polyester (LCP1) to polyaryletherketone (P2) to 93:7 (mass ratio). Otherwise, the same procedure as in Examples 1-1 was followed. The results are shown in Table 3.

[0140] (Example 3-2) (1) Preparation of polyaryletherketone (P3) As polyaryletherketone (P3), Victrex-manufactured polyetheretherketone 450P (PEEK, viscosity: 401 Pa·s, granular form) was prepared.

[0141] (2) Manufacturing and evaluation of liquid crystal polyester compositions The liquid crystal polyester composition was prepared and evaluated by replacing polyaryletherketone (P1) with polyaryletherketone (P3) and changing the mixing ratio of liquid crystal polyester (LCP1) to polyaryletherketone (P3) to 97:3 (mass ratio). Otherwise, the same procedure as in Examples 1-1 was followed. The results are shown in Table 3.

[0142] (Example 3-3) (1) Preparation of polyaryletherketone (P4) As polyaryletherketone (P4), Victrex-manufactured polyaryletherketone LMPAEK 101GRA (PAEK, viscosity: 203 Pa·s, granular form) was prepared.

[0143] (2) Manufacturing and evaluation of liquid crystal polyester compositions The liquid crystal polyester composition was prepared and evaluated by replacing polyaryletherketone (P1) with polyaryletherketone (P4) and changing the mixing ratio of liquid crystal polyester (LCP1) to polyaryletherketone (P4) to 93:7 (mass ratio). Otherwise, the same procedure as in Examples 1-1 was followed. The results are shown in Table 3.

[0144] As shown in Table 3, it was confirmed that by combining liquid crystal polyester with other polyaryletherketones, excellent flowability can also be achieved, and molded articles exhibiting low dielectric constant and low dielectric loss tangent, as well as excellent mechanical properties (especially tensile strength and elongation).

Claims

1. A liquid crystal polyester composition comprising a liquid crystal polyester and a polyarylether ketone, the liquid crystal polyester containing a first monomer unit having a condensed aromatic ring. The total content of the liquid crystal polyester and the polyarylether ketone is 80% by mass or more. The content of polyaryletherketone is more than 1 part by mass and less than 18 parts by mass relative to 100 parts by mass of the liquid crystal polyester.

2. The liquid crystal polyester composition according to claim 1, wherein, The condensed aromatic ring is a naphthalene ring.

3. The liquid crystal polyester composition according to claim 1, wherein, The content of the first monomer unit is 40 mol% or more relative to the total of all monomer units constituting the liquid crystal polyester.

4. The liquid crystal polyester composition according to claim 1, wherein, The liquid crystal polyester also has a second monomer unit containing a benzene ring but without a condensed aromatic ring.

5. The liquid crystal polyester composition according to claim 1, wherein, The polyaryletherketone is polyetheretherketone.

6. The liquid crystal polyester composition according to claim 1, having a sea-island structure comprising a sea portion containing the liquid crystal polyester and a plurality of island portions containing the polyaryl ether. In the cross-section of the island structure, the average area of ​​the island portion is 25 μm. 2 the following.

7. A granule comprising the liquid crystal polyester composition according to any one of claims 1 to 6.

8. A molded article comprising the liquid crystal polyester composition according to any one of claims 1 to 6, The molded products include connectors, sockets, relay components, winding tubes, optical pickups, oscillators, semiconductor packages, IC trays, wafer carriers, household appliance components, lighting equipment components, audio product components, fiber optic cable ferrules, telephone components, fax machine components, modem components, release claws, heater brackets, impellers, fan gears, gears, bearings, motor components, motor housings, engine components, engine compartment components, electrical components, automotive interior components, microwave cooking pots, heat-resistant tableware, flooring materials, wall materials, beams, columns, roofing materials, aircraft components, spacecraft components, aerospace equipment components, nuclear reactors, marine facility components, washing fixtures, optical equipment components, valves, pipes, nozzles, filters, medical equipment components, medical materials, sensor components, hygiene supplies, and sporting or leisure products.

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