Liquid crystal polyester composition, pellets, and molded articles

Abstract

To provide a liquid crystal polyester composition that exhibits excellent fluidity, low dielectric constant and low dielectric loss tangent, and can form molded articles with excellent mechanical properties (especially tensile strength and tensile elongation). [Solution] A liquid crystal polyester composition comprising a liquid crystal polyester containing a first monomer unit having a condensed aromatic ring, and a polyaryl ether ketone, wherein the total content of the liquid crystal polyester and the polyaryl ether ketone is 80% by mass or more, and the content of the polyaryl ether ketone is 1 part by mass or more and 18 parts by mass or less per 100 parts by mass of the liquid crystal polyester.

Description

Technical Field

[0001] The present disclosure relates to a liquid crystal polyester composition, pellets, and molded articles.

Background Art

[0002] Liquid crystal polyesters are used in various applications because of their high fluidity, heat resistance, and dimensional accuracy.

[0003] For example, Patent Document 1 describes a liquid crystal polymer composition containing a specific amount of a specific flat glass fiber and a specific plate-like filler.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0005] In recent years, due to the expansion into more diverse applications, further improvement in mechanical properties has been demanded. However, with conventional methods, it has been difficult to improve the mechanical properties (particularly tensile strength and tensile elongation) while maintaining the good properties of liquid crystal polyesters such as low dielectric constant, low dielectric loss tangent, and high fluidity.

[0006] An object of the present disclosure is to provide a liquid crystal polyester composition capable of forming a molded article having excellent fluidity, showing a low dielectric constant and a low dielectric loss tangent, and excellent mechanical properties (particularly tensile strength and tensile elongation). Another object of the present disclosure is to provide pellets and molded articles containing the above liquid crystal polyester composition.

Means for Solving the Problems

[0007] This disclosure relates, for example, to the following [1] to [8]. [1] A liquid crystal polyester containing a first monomer unit having a condensed aromatic ring, and a polyaryl ether ketone, The total content of the liquid crystal polyester and the polyaryl ether ketone is 80% by mass or more. The content of the polyaryl ether ketone is 1 part by mass or more and 18 parts by mass or less per 100 parts by mass of the liquid crystal polyester. Liquid crystal polyester composition. [2] The liquid crystal polyester composition according to [1], wherein the condensed aromatic ring is a naphthalene ring. [3] The liquid crystal polyester composition according to [1] or [2], wherein the content of the first monomer unit is 40 mol% or more of the total amount of all monomer units constituting the liquid crystal polyester. [4] The liquid crystal polyester composition according to any one of [1] to [3], wherein the liquid crystal polyester does not have a condensed aromatic ring and further has a second monomer unit having a benzene ring. [5] The liquid crystal polyester composition according to any one of [1] to [4], wherein the polyaryl ether ketone is a polyether ether ketone. [6] The sea island structure comprises a sea portion containing the liquid crystal polyester and a plurality of island portions containing the polyaryl ether, In the cross-section of the aforementioned sea-island structure, the average area of ​​the island portion is 25 μm². 2 A liquid crystal polyester composition according to any one of the following [1] to [5]. [7] A pellet comprising the liquid crystal polyester composition described in any one of [1] to [6]. [8] A molded article comprising a liquid crystal polyester composition described in any one of [1] to [6], The molded product is a connector, socket, relay component, coil bobbin, optical pickup, oscillator, semiconductor package, IC tray, wafer carrier, household electrical appliance component, lighting fixture component, audio product component, optical cable ferrule, telephone component, facsimile component, modem component, separation claw, heater holder, impeller, fan gear, gear, bearing, motor component, motor case, engine component, engine compartment component, electrical component, automotive interior component, microwave cooking pot, heat-resistant tableware, flooring material, wall material, beam, column, roofing material, aircraft component, spacecraft component, space equipment component, nuclear reactor, marine facility component, cleaning jig, optical instrument component, valves, pipes, nozzles, filters, medical equipment component, medical material, sensor component, sanitary equipment, sports equipment, or leisure goods. [Effects of the Invention]

[0008] This disclosure provides a liquid crystal polyester composition that exhibits excellent fluidity, low dielectric constant and low dielectric loss tangent, and can form molded articles with excellent mechanical properties (particularly tensile strength and tensile elongation). This disclosure also provides pellets and molded articles containing the above liquid crystal polyester composition. [Brief explanation of the drawing]

[0009] [Figure 1] Figure 1 shows an SEM image of a cross-section of the liquid crystal polyester composition of Example 1-1. [Figure 2] Figure 2 shows SEM images of cross-sections of the liquid crystal polyester compositions of Examples 1-2. [Figure 3] Figure 3 shows an SEM image of a cross-section of the liquid crystal polyester composition of Example 2-1. [Figure 4] Figure 4 shows an SEM image of a cross-section of the liquid crystal polyester composition of Comparative Example 2-1. [Modes for carrying out the invention]

[0010] Preferred embodiments of this disclosure are described in detail below.

[0011] The liquid crystal polyester composition of this embodiment (hereinafter also simply referred to as "liquid crystal polyester composition") contains liquid crystal polyester and polyaryl ether ketone. The liquid crystal polyester contains a first monomer unit having a condensed aromatic ring. The total content of liquid crystal polyester and polyaryl ether ketone in the liquid crystal polyester composition is 80% by mass or more. The content of polyaryl ether ketone is 1 part by mass or more and 18 parts by mass or less per 100 parts by mass of liquid crystal polyester.

[0012] In the liquid crystal polyester composition of this embodiment, a specific combination of liquid crystal polyester and polyaryl ether ketone achieves fluidity of the composition, low dielectric constant of the molded article, low dielectric loss tangent of the molded article, and excellent mechanical properties (particularly tensile strength and tensile elongation) of the molded article. In other words, the liquid crystal polyester composition of this embodiment has excellent fluidity, and according to the liquid crystal polyester composition of this embodiment, it is possible to form a molded article that exhibits low dielectric constant and low dielectric loss tangent, and has excellent mechanical properties (particularly tensile strength and tensile elongation).

[0013] In the liquid crystal polyester composition of this embodiment, the liquid crystal polyester has a condensed aromatic ring, which exhibits good interaction with the aromatic ring of the polyaryl ether ketone. Therefore, in the liquid crystal polyester composition of this embodiment, the polyaryl ether ketone is easily dispersed as fine domains in the matrix of the liquid crystal polyester, and it is believed that this allows for excellent mechanical properties (especially tensile strength and tensile elongation) while maintaining the excellent properties of the liquid crystal polyester (fluidity, low dielectric constant, and low dielectric loss tangent).

[0014] The liquid crystal polyester can be any polyester that exhibits liquid crystal properties in a molten state. The liquid crystal polyester composition may contain only one type of liquid crystal polyester, or it may contain two or more types.

[0015] Liquid crystal polyesters have constituent units (also called monomer units) derived from raw material monomers. Liquid crystal polyesters may have a main group of monomer units (for example, 90 mol% or more, 95 mol% or more, or 99 mol% or more of monomer units relative to the total number of monomer units, preferably all monomer units) that are derived from aromatic compounds. Liquid crystal polyesters in which all monomer units are derived from aromatic compounds are also called all-aromatic liquid crystal polyesters.

[0016] Liquid crystal polyester contains a first monomer unit having a condensed aromatic ring. Liquid crystal polyester may contain only one type of the first monomer unit, or it may contain two or more types of the first monomer unit. Liquid crystal polyester may further contain a second monomer unit that does not have a condensed aromatic ring but has a benzene ring. Liquid crystal polyester may contain only one type of the second monomer unit, or it may contain two or more types of the second monomer unit.

[0017] The first monomer unit may be a monomer unit derived from an aromatic compound (1) having a condensed aromatic ring. The second monomer unit may be a monomer unit derived from an aromatic compound (2) that does not have a condensed aromatic ring but has a benzene ring.

[0018] In this specification, "derived from" means that in the monomer units of the liquid crystal polyester formed by the polymerization of the raw material monomers, the chemical structure of the functional groups that contribute to polymerization of the raw material monomers has changed, while no other structural changes have occurred. Here, "derived from" is a concept that also includes cases where the product is derived from polymerizable derivatives of the raw material monomers (for example, compounds obtained by converting the functional groups that contribute to polymerization of the raw material monomers into other polymerizable groups).

[0019] Examples of the first monomer unit include a monomer unit derived from an aromatic hydroxycarboxylic acid (1-1) having a condensed aromatic ring (hereinafter also referred to as monomer unit (1-1)), a monomer unit derived from an aromatic dicarboxylic acid (1-2) having a condensed aromatic ring (hereinafter also referred to as monomer unit (1-2)), a monomer unit derived from an aromatic diol (1-3) having a condensed aromatic ring (hereinafter also referred to as monomer unit (1-3)), and the like.

[0020] Examples of the second monomer unit include a monomer unit derived from an aromatic hydroxycarboxylic acid (2-1) (hereinafter also referred to as monomer unit (2-1)), a monomer unit derived from an aromatic dicarboxylic acid (2-2) (hereinafter also referred to as monomer unit (2-2)), a monomer unit derived from an aromatic diol (2-3) (hereinafter also referred to as monomer unit (2-3)), and the like.

[0021] Examples of the condensed aromatic ring of the first monomer unit include a naphthalene ring, an anthracene ring, a phenanthrene ring, a tetracene ring, a pyrene ring, a triphenylene ring, a perylene ring, a fluorene ring, etc. Among these, from the viewpoints of availability and price, the naphthalene ring is preferable.

[0022] Examples of the monomer unit of the liquid crystal polyester include a monomer unit represented by the following formula (I) (hereinafter also referred to as monomer unit (I)), a monomer unit represented by the following formula (II) (hereinafter also referred to as monomer unit (II)), a monomer unit represented by the following formula (III) (hereinafter also referred to as monomer unit (III)), and the like. -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 independently represents a phenylene group, a biphenylene group, a condensed polycyclic aromatic hydrocarbon group, or a group represented by the formula (IV). Ar 1 , Ar 2and Ar 3 Some or all of the hydrogen atoms in may 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 of these 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 alkanediyl group.

[0023] The phenylene group may be a 1,4-phenylene group or a 1,3-phenylene group, and is preferably a 1,4-phenylene group.

[0024] The biphenylene group may be a 4,4'-biphenylylene group.

[0025] A condensed polycyclic aromatic hydrocarbon group is a group obtained by removing two hydrogen atoms from a condensed polycyclic aromatic hydrocarbon. Examples of condensed polycyclic aromatic hydrocarbons include naphthalene, anthracene, phenanthrene, tetracene, pyrene, triphenylene, perylene, and fluorene. Of these, naphthalene is preferred from the viewpoint of availability and price.

[0026] The condensed polycyclic aromatic hydrocarbon group may be a naphthylene group. The naphthylene group may be, for example, a 1,3-naphthylene group, a 1,4-naphthylene group, a 1,5-naphthylene group, a 1,6-naphthylene group, a 1,7-naphthylene group, a 1,8-naphthylene group, a 2,4-naphthylene group, a 2,5-naphthylene group, a 2,6-naphthylene group, or a 2,7-naphthylene group, preferably a 2,6-naphthylene group or a 2,7-naphthylene group, and more preferably a 2,6-naphthylene group.

[0027] Examples of halogen atoms as substituents include fluorine atoms, chlorine atoms, bromine atoms, and iodine atoms. The halogen atom as substituent may be a fluorine atom, a chlorine atom, or a bromine atom, or it may be a fluorine atom or a chlorine atom, or it may be a fluorine atom.

[0028] The alkyl group as a substituent may be linear, branched, or cyclic. The alkyl group may be, for example, an alkyl group having 1 to 10 carbon atoms. Examples of alkyl groups include methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, isobutyl group, s-butyl group, t-butyl group, n-hexyl group, 2-ethylhexyl group, n-octyl group, n-decyl group, and the like.

[0029] The aryl group as a substituent may be a monocyclic or fused ring. The aryl group may be, for example, an aryl group having 6 to 20 carbon atoms. Examples of aryl groups include phenyl, o-tolyl, m-tolyl, p-tolyl, 1-naphthyl, and 2-naphthyl groups. The aryl group may also be a group in which a hydrogen atom of the aromatic ring is substituted with an alkyl group, such as the tolyl group.

[0030] Ar 1 Ar 2 and Ar 3 The number of substituents it has may be, for example, 0 to 2, 0 or 1, or 0.

[0031] X and Y are preferably oxygen atoms.

[0032] The alkanediyl group in Z may be linear or branched. The alkanediyl group may be an alkanediyl group having 1 to 10 carbon atoms. Examples of alkanediyl groups include methylene group, ethanediyl group, propanediyl group (e.g., propane-2,2-diyl group), butanediyl group, octanediyl group (e.g., octane-3,3-diyl group), etc.

[0033] 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.

[0034] The first monomer unit is the monomer unit (Ar) represented by equation (I). 1 However, condensed polycyclic aromatic hydrocarbon groups, or Ar 4 and Ar 5 The group may be one of which is a condensed polycyclic aromatic hydrocarbon group represented by formula (IV), and may also be a monomer unit represented by formula (II) (Ar 2 However, condensed polycyclic aromatic hydrocarbon groups, or Ar 4 and Ar 5 It may also be a group represented by formula (IV) in which at least one of the groups is a condensed polycyclic aromatic hydrocarbon group, and a monomer unit represented by formula (III) (Ar 2 However, condensed polycyclic aromatic hydrocarbon groups, or Ar 4 and Ar 5 The group may be one of which is a condensed polycyclic aromatic hydrocarbon group represented by formula (IV).

[0035] The first monomer unit may 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-naphthalenedicarboxylic acid, 2,6-dihydroxynaphthalene, 2-hydroxy-3-naphthoic acid, 1-hydroxy-5-naphthoic acid, and 2,7-naphthalenediol.

[0036] The second monomer unit is the monomer unit (Ar) represented by equation (I). 1 However, a phenylene group, a biphenylene group, or Ar 4 and Ar 5 It may also be a group represented by formula (IV) which is a phenylene group, and a monomer unit represented by formula (II) (Ar 2 However, a phenylene group, a biphenylene group, or Ar 4 and Ar 5 It may also be a group represented by formula (IV) which is a phenylene group, and a monomer unit represented by formula (III) (Ar 3However, a phenylene group, a biphenylene group, or Ar 4 and Ar 5 It may also be a group represented by formula (IV), where is a phenylene group.

[0037] The second monomer unit may be a monomer unit derived from an aromatic compound (2) that does not have a condensed aromatic ring but has a benzene ring. Examples of aromatic compounds (2) include p-hydroxybenzoic acid, terephthalic acid, hydroquinone, isophthalic acid, and 4,4'-biphenol.

[0038] In liquid crystal polyester, the content of the first monomer unit may be, for example, 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, relative to the total amount of monomer units constituting the liquid crystal polyester. A higher content of the first monomer unit tends to improve dielectric properties. Alternatively, the content of the first monomer unit may be, for example, 90 mol% or less, 85 mol% or less, or 80 mol% or less, relative to the total amount of monomer units constituting the liquid crystal polyester. This tends to result in good moldability and processability at low temperatures. In other words, the content of the first monomer unit may be, for example, 20 mol% to 90 mol%, 20 mol% to 85 mol%, 20 mol% to 80 mol%, 30 mol% to 90 mol%, 30 mol% to 85 mol%, 30 mol% to 80 mol%, 40 mol% to 90 mol%, 40 mol% to 85 mol%, 40 mol% to 80 mol%, 50 mol% to 90 mol%, 50 mol% to 85 mol%, 50 mol% to 80 mol%, 60 mol% to 90 mol%, 60 mol% to 85 mol%, 60 mol% to 80 mol%, 70 mol% to 90 mol%, 70 mol% to 85 mol%, or 70 mol% to 80 mol% with respect to the total amount of all monomer units constituting the liquid crystal polyester.

[0039] In liquid crystal polyester, the content of the second monomer unit may be, for example, 10 mol% or more, 15 mol% or more, or 20 mol% or more, relative to the total amount of monomer units constituting the liquid crystal polyester. Alternatively, the content of the second monomer unit may be, for example, 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, relative to the total amount of monomer units constituting the liquid crystal polyester. That is, the content of the second monomer unit may be, for example, 10 mol% to 80 mol%, 10 mol% to 70 mol%, 10 mol% to 60 mol%, 10 mol% to 50 mol%, 10 mol% to 40 mol%, 10 mol% to 30 mol%, 15 mol% to 80 mol%, 15 mol% to 70 mol%, 15 mol% to 60 mol%, 15 mol% to 50 mol%, 15 mol% to 40 mol%, 15 mol% to 30 mol%, 20 mol% to 80 mol%, 20 mol% to 70 mol%, 20 mol% to 60 mol%, 20 mol% to 50 mol%, 20 mol% to 40 mol%, or 20 mol% to 30 mol%.

[0040] In liquid crystal polyester, the total amount of the first monomer unit and the second monomer unit may be, for example, 90 mol% or more, 95 mol% or more, 99 mol% or more, or 100 mol% of the total amount of all monomer units constituting the liquid crystal polyester.

[0041] The liquid crystal polyester may be a polymer having two or more monomer units (I), and may also be a polymer having monomer units (I), monomer units (II), and monomer units (III).

[0042] When the liquid crystal polyester has monomer units (I), monomer units (II), and monomer units (III), the content of monomer unit (I) may be, for example, 30 mol% or more, 40 mol% or more, 45 mol% or more, 50 mol% or more, or 55 mol% or more, relative to the total amount of monomer units of the liquid crystal polyester. Also, when the liquid crystal polyester has monomer units (I), monomer units (II), and monomer units (III), the content of monomer unit (I) may be, for example, 80% or less, or 70% or less, relative to the total amount of monomer units of the liquid crystal polyester. That is, when the liquid crystal polyester has monomer units (I), monomer units (II), and monomer units (III), the content of monomer unit (I) may be, for example, 30 mol% to 80 mol%, 30 mol% to 70 mol%, 40 mol% to 80 mol%, 40 mol% to 70 mol%, 45 mol% to 80 mol%, 45 mol% to 70 mol%, 50 mol% to 80 mol%, 50 mol% to 70 mol%, 55 mol% to 80 mol%, or 55 mol% to 70 mol% with respect to the total amount of monomer units of the liquid crystal polyester.

[0043] When the liquid crystal polyester has monomer units (I), monomer units (II), and monomer units (III), the content of monomer units (II) and monomer units (III) may be, for example, 35 mol% or less and 30 mol% or less, respectively, relative to the total amount of monomer units of the liquid crystal polyester. Also, when the liquid crystal polyester has monomer units (I), monomer units (II), and monomer units (III), the content of monomer units (II) and monomer units (III) may be, for example, 5 mol% or more, 10 mol% or more, or 15 mol% or more, respectively, relative to the total amount of monomer units of the liquid crystal polyester. That is, when the liquid crystal polyester has monomer units (I), monomer units (II), and monomer units (III), the content of monomer units (II) and monomer units (III) may be, for example, 5 mol% to 35 mol%, 5 mol% to 30 mol%, 10 mol% to 35 mol%, 10 mol% to 30 mol%, 15 mol% to 35 mol%, or 15 mol% to 30 mol%, respectively, relative to the total amount of monomer units of the liquid crystal polyester.

[0044] Liquid crystal polyester may have monomer units other than monomer unit (I), monomer unit (II), and monomer unit (III), but the number of such units may be 10 mol% or less, 5 mol% or less, 2 mol% or less, or 1 mol% or less, or 0 mol%, relative to the total amount of monomer units of the liquid crystal polyester.

[0045] In a preferred embodiment, the liquid crystal polyester may contain, as a first monomer unit, 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-naphthalenedicarboxylic acid. The liquid crystal polyester may contain only one of monomer units (1-1) and monomer units (1-2), or it may contain both.

[0046] When liquid crystal polyester contains monomer units (1-1), the content of monomer units (1-1) may be, for example, 20 mol% or more, 30 mol% or more, 40 mol% or more, or 50 mol% or more, relative to the total amount of monomer units of the liquid crystal polyester. Furthermore, the content of monomer units (1-1) in liquid crystal polyester may be, for example, 80 mol% or less, 75 mol% or less, 70 mol% or less, or 65 mol% or less, relative to the total amount of monomer units of the liquid crystal polyester.

[0047] When the liquid crystal polyester contains monomer units (1-1), the proportion of monomer units (1-1) to the first monomer unit may be, for example, 40 mol% or more, and may be 50 mol% or more, 60 mol% or more, or 70 mol% or more. Alternatively, the proportion of monomer units (1-1) to the first monomer unit may be, for example, 100 mol% or less, and may be 99 mol% or less, 90 mol% or less, 85 mol% or less, 80 mol% or less, or 78 mol% or less.

[0048] When the liquid crystal polyester contains monomer units (1-2), the content of monomer units (1-2) may be, for example, 1 mol% or more, 5 mol% or more, 10 mol% or more, or 15 mol% or more, relative to the total amount of monomer units of the liquid crystal polyester. Furthermore, the content of monomer units (1-2) in the liquid crystal polyester may be, for example, 50 mol% or less, 40 mol% or less, 30 mol% or less, or 25 mol% or less, relative to the total amount of monomer units of the liquid crystal polyester.

[0049] When the liquid crystal polyester contains monomer units (1-2), the proportion of monomer units (1-2) to the first monomer unit may be, for example, 1 mol% or more, and may be 10 mol% or more, 15 mol% or more, or 20 mol% or more. Alternatively, the proportion of monomer units (1-2) to the first monomer unit may be, for example, 100 mol% or less, and may be 60 mol% or less, 50 mol% or less, 40 mol% or less, or 30 mol% or less.

[0050] In a preferred embodiment, the liquid crystal polyester may contain, as a second monomer unit, at least one monomer unit selected from the group consisting of monomer units derived from hydroquinone (2-1) and monomer units derived from terephthalic acid (2-2). The liquid crystal polyester may contain only one of monomer units (2-1) and monomer unit (2-2), or it may contain both.

[0051] When the liquid crystal polyester contains monomer units (2-1), the content of monomer units (2-1) may be, for example, 0.1 mol% or more, 1 mol% or more, 8 mol% or more, or 15 mol% or more, relative to the total amount of monomer units of the liquid crystal polyester. Furthermore, the content of monomer units (2-1) in the liquid crystal polyester may be, for example, 40 mol% or less, 35 mol% or less, 30 mol% or less, or 25 mol% or less, relative to the total amount of monomer units of the liquid crystal polyester.

[0052] When the liquid crystal polyester contains monomer units (2-1), the proportion of monomer units (2-1) in the second monomer unit may be, for example, 5 mol% or more, and may also be 10 mol% or more, 30 mol% or more, 50 mol% or more, 60 mol% or more, or 70 mol% or more. Alternatively, the proportion of monomer units (2-1) in the second monomer unit may be, for example, 100 mol% or less, and may also be 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.

[0053] When the liquid crystal polyester contains monomer units (2-2), the content of monomer units (2-2) may be, for example, 0.1 mol% or more, and may also be 1 mol% or more, 2 mol% or more, or 3 mol% or more, relative to the total amount of monomer units of the liquid crystal polyester. Furthermore, the content of monomer units (2-2) in the liquid crystal polyester may be, for example, 50 mol% or less, and may also be 30 mol% or less, 20 mol% or less, or 10 mol% or less, relative to the total amount of monomer units of the liquid crystal polyester.

[0054] When the liquid crystal polyester contains monomer units (2-2), the proportion of monomer units (2-2) in the second monomer unit may be, for example, 1 mol% or more, and may also be 2 mol% or more, 3 mol% or more, 5 mol% or more, 10 mol% or more, or 15 mol% or more. Furthermore, the proportion of monomer units (2-2) in the second monomer unit may be, for example, 100 mol% or less, and may also be 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.

[0055] In this specification, the number of each monomer unit in a liquid crystal polyester is determined by the analytical method described in Japanese Patent Application Publication No. 2000-19168. Specifically, the number of each monomer unit relative to the total number of monomer units can be calculated by depolymerizing the liquid crystal polyester by reacting it with a lower alcohol in a supercritical state and quantifying the depolymerization product (monomers that induce each monomer unit) by liquid chromatography.

[0056] Liquid crystal polyester can be produced by polymerizing raw material monomers corresponding to the monomer units that constitute it. For example, it can be produced according to the method described in Japanese Patent No. 6439027.

[0057] The flow initiation temperature of the liquid crystal polyester may be, for example, 250°C or higher, or 270°C or higher. Alternatively, the flow initiation temperature of the liquid crystal polyester may be, for example, 400°C or lower, 360°C or lower, or 340°C or lower. In other words, the flow initiation temperature of the liquid crystal polyester may be, for example, 250°C to 400°C, 250°C to 360°C, 250°C to 340°C, 270°C to 400°C, 270°C to 360°C, or 270°C to 340°C.

[0058] In this specification, the flow initiation temperature of liquid crystal polyester is measured using a flow tester, and the liquid crystal polyester is subjected to 9.8 MPa (100 kg / cm³). 2 Under a load of ), the liquid crystal polyester is melted while the temperature is increased at a rate of 4°C / min, and the molten liquid crystal polyester is extruded from a nozzle with an inner diameter of 1 mm and a length of 10 mm, at a temperature at which its viscosity is 4800 Pa·s (48000 poise).

[0059] The dielectric loss tangent of the liquid crystal polyester at 10 GHz may be, for example, 0.002 or less, preferably 0.0015 or less, and more preferably 0.001 or less. This makes it easier to obtain compositions having the preferred dielectric loss tangent described later.

[0060] The relative permittivity of liquid crystal polyester at 10 GHz may be, for example, 4.0 or less, or 3.8 or less. Alternatively, the relative permittivity of liquid crystal polyester at 10 GHz may be, for example, 2.5 or more.

[0061] In this specification, the dielectric loss tangent and relative permittivity of liquid crystal polyester at 10 GHz are measured using a vector network analyzer (Keysight Technologies, Inc., N5290A) and a split-cylinder resonator (EM Labs, Inc., CR710). The measurement environment is 23°C and 50% RH.

[0062] The liquid crystal polyester content may be, for example, 60% by mass or more, 70% by mass or more, 80% by mass or more, 85% by mass or more, or 90% by mass or more, based on the total amount of the liquid crystal polyester composition. Alternatively, the liquid crystal polyester content may be, for example, 99% by mass or less, or 98% by mass or less, based on the total amount of the liquid crystal polyester composition.

[0063] Polyaryl ether ketones are polymers that have a structure in which multiple arylene groups are linked by linking groups, with some of the linking groups being ether groups (-O-) and the other parts being carbonyl groups (-CO-).

[0064] A polyaryletherketone may have, for example, a repeating unit (A-1) represented by the following formula (A-1) and a repeating unit (A-2) represented by the following formula (A-2). -Ar 11 -O- (A-1) -Ar 12 -CO- (A-2) [In the formula, Ar 11 and Ar 12 Each of these independently represents an arylene group.

[0065] Ar 11 and Ar 12The arylene group in this product may be, for example, a 1,4-phenylene group, a 1,3-phenylene group, a 4,4'-biphenylene group, and is preferably a 1,4-phenylene group.

[0066] Examples of polyaryletherketones include polyetherketones having a repeating unit (B-1) represented by the following formula (B-1), polyetheretherketones having a repeating unit (B-2) represented by the following formula (B-2), polyetherketoneketones having a repeating unit represented by the following formula (B-3), and polyetheretherketoneketones having a repeating unit represented by the following formula (B-4). From the viewpoint of further improving the mechanical properties of the molded article (especially tensile strength and tensile elongation), polyetheretherketones are preferred. -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 of these independently represents an arylene group.

[0067] Ar 21 Ar 22 Ar 23 and Ar 24 The arylene group in this product may be, for example, a 1,4-phenylene group, a 1,3-phenylene group, a 4,4'-biphenylene group, and is preferably a 1,4-phenylene group.

[0068] The melting point of polyaryletherketone may be, for example, 300°C or higher, 320°C or higher, or 330°C or higher. A higher melting point of polyaryletherketone tends to improve mechanical properties (especially tensile strength and tensile elongation). The melting point of polyaryletherketone may be, for example, 380°C or lower, 360°C or lower, or 350°C or lower. A lower melting point of polyaryletherketone tends to improve processability.

[0069] Viscosity of polyarylether ketone (400°C, 1000s) -1 The viscosity (400°C, 1000s) may be, for example, 500 Pa·s or less, and may also be 450 Pa·s or less, 400 Pa·s or less, 350 Pa·s or less, 300 Pa·s or less, 200 Pa·s or less, or 150 Pa·s or less. A lower viscosity tends to improve the dispersibility of the polyaryl ether ketone in the liquid crystal polyester composition. -1 The viscosity may be, for example, 1 Pa·s or more, and may also be 10 Pa·s or more, 30 Pa·s or more, or 50 Pa·s or more. Higher viscosity tends to improve mechanical properties (especially tensile strength and tensile elongation).

[0070] In this specification, the viscosity of polyaryletherketone is measured using a capillary rheometer (Capillograph 1D, manufactured by Toyo Seiki Seisakusho Co., Ltd.), with a capillary tube having an inner diameter of 0.5 mm and a length of 10 mm attached to the tip of the cylinder. The pellet to be measured is melted in a cylinder heated to 400°C, extruded from a nozzle, and measured at a shear rate of 1000 / second.

[0071] The polyaryletherketone content is 1 part by mass or more per 100 parts by mass of liquid crystal polyester, and may be 1.5 parts by mass or more, or 2 parts by mass or more, from the viewpoint of obtaining the above-mentioned effects more significantly. Alternatively, the polyaryletherketone content may be 18 parts by mass or less per 100 parts by mass of liquid crystal polyester, and may 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, from the viewpoint of obtaining the above-mentioned effects more significantly.

[0072] In the liquid crystal polyester composition, the total content of liquid crystal polyester and polyaryl ether ketone is 80% by mass or more, and from the viewpoint of obtaining the above-mentioned effects more significantly, it may 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 polyaryl ether ketone may be 100% by mass.

[0073] A liquid crystal polyester composition may have a sea-island structure comprising a sea portion containing liquid crystal polyester and multiple island portions containing polyaryl ether. In such a liquid crystal polyester composition, it can be said that polyaryl ether ketones are efficiently dispersed as fine domains within the matrix of the liquid crystal polyester. Such a liquid crystal polyester composition has excellent mechanical properties (particularly tensile strength and tensile elongation) and excellent stability of its mechanical properties (particularly tensile strength and tensile elongation). The sea-island structure may be observed in a cross-section of the liquid crystal polyester composition.

[0074] The stability of the mechanical properties (especially tensile strength and tensile elongation) can be evaluated using the coefficient of variation expressed by the following formula. In the formula below, n is the number of measurements, xi is each measurement result, and x is the average value of the measurement results. Also, Σ means that the sum is taken over all measurement results. Also, ^(1 / 2) means that the whole is raised to the power of 1 / 2. It is preferable that the number of measurements n is 5 or more. Coefficient of variation = Sample standard deviation / Mean Sample standard deviation={1 / (n-1) Σ(xi-x) 2}^(1 / 2)

[0075] In a cross-section of a liquid crystal polyester composition, the average area of ​​the island portion is, for example, 25 μm². 2 The following may be used, and from the viewpoint of obtaining the above-mentioned effect more significantly, 20 μm 2 Below, 15μm 2 Below, 12μm 2 or less, or 10 μm 2 The following may also apply. Furthermore, the average area of ​​the island portion in the cross-section of the liquid crystal polyester composition may be, for example, 0.1 μm². 2 The above is sufficient, and from the viewpoint of production efficiency, 0.3 μm 2 or greater than 0.5 μm 2 That's fine too.

[0076] The average area of ​​the islands can be adjusted by, for example, the degree of polymerization of the liquid crystal polyester (viscosity, flow onset temperature), the viscosity of the polyaryl ether ketone, the viscosity ratio of the liquid crystal polyester to the polyaryl ether ketone, the shape of the sample before granulation, and the granulation conditions. For example, as the degree of polymerization of the liquid crystal polyester increases (i.e., viscosity and flow onset temperature increase), the average area of ​​the islands tends to decrease. Also, for example, as the viscosity of the polyaryl ether ketone decreases, the average area of ​​the islands tends to decrease. Also, for example, as the viscosity ratio of the liquid crystal polyester to the polyaryl ether ketone approaches 1, the average area of ​​the islands tends to decrease. Also, for example, when the shape of the sample before granulation is small or when the kneading strength during granulation is high, the average area of ​​the islands in the liquid crystal polyester composition after granulation tends to decrease.

[0077] In this specification, the average area of ​​an island is measured by the following method: (1) Preparation of samples for SEM measurement The pellet of the material to be measured (liquid crystal polyester composition) is cut perpendicular to the molding direction to obtain a cross-section (equipment used: Leica Microsystems Segemicrotome SP1600). Next, the sides of the pellet are ground with sandpaper up to near the center. Then, the surface is leveled using a microtome so that the cross-section is 1 mm wide (equipment used: Leica Microsystems Ultramicrotome EM UC6). Next, the 1 mm wide cross-section is ground to form the measurement surface (equipment used: JEOL cross-section polisher SM-09010, grinding conditions: liquid nitrogen cooling (below -100°C), acceleration voltage 6kV, processing time 8hrs, Ar gas used). Next, the material to be measured is fixed to the SEM sample stage with carbon tape and coated with osmium (equipment used: Meiwa Forsis Neoc osmium coater, coating time: 3 seconds) to obtain a sample for SEM measurement.

[0078] (2) SEM imaging and image analysis A scanning electron microscope (SEM, Hitachi High-Tech S-4800) is used to observe the measurement surface of a sample for SEM measurement and acquire an SEM image. Specifically, the observation conditions are set to an acceleration voltage of 15kV and a working distance (WD) of 15mm, and the backscattered electron image obtained by a YAG detector is observed at a magnification of 500x (image resolution of 198.4375nm / pix) to acquire the SEM image. In acquiring the SEM image, the focus is manually adjusted to ensure clarity of the secondary electron image before inserting the YAG detector, and the contrast is manually adjusted to ensure clarity of the backscattered electron image after inserting the YAG detector.

[0079] Image analysis is performed on the obtained SEM images. Specifically, using the image analysis software ImageJ FIJI (ver 2.9.0 / 1.53t), the SEM images are first loaded, and only the area where the measurement surface is displayed is extracted. A Gaussian filter is applied to the extracted image using sigma2. Next, automatic segmentation is performed on the Gaussian-filtered image using default conditions to obtain a binarized image. The background of the binarized image is set to black, and to remove any remaining fine noise in the binarized image, two compressions followed by two expansions are performed. Finally, a hole-filling process is applied to the binarized image.

[0080] Since the resulting binarized image lacks length units, we will add them. Specifically, launch Set Scale and set Distance in pixels to 1, Known distance to the length per pixel (for example, 0.1984375 μm / pixel in this example), Pixel aspect ratio to 1, and Unit of length to the unit of length (for example, μm in this example).

[0081] Particle analysis (Analyze Particles) is performed on the bi-toned image after the above processing to measure the area of ​​the island regions. During measurement, the measurement size is set to 0-Infinity, the roundness to 0.00-1.00, the display to Nothing, and the result display to Display results. This allows the area of ​​each island region within the image field of view to be obtained. The average area of ​​the island regions is obtained by arithmetic mean from the obtained areas of each island region.

[0082] The liquid crystal polyester composition may further contain other components besides liquid crystal polyester and polyaryl ether ketone.

[0083] For example, a liquid crystal polyester composition may contain one or more resins other than liquid crystal polyester and polyaryl ether ketone. Examples of such resins include polyolefins, cyclic polyolefins, polyvinyl chloride, polysulfones, (meth)acrylic resins, polyphenylene ether resins, polyacetal resins, polyamide resins, imide resins, cellulose resins, polyether ether ketone resins, fluororesins, polycarbonate resins, and thermosetting resins.

[0084] Furthermore, the liquid crystal polyester composition may further contain inorganic fillers, colorants, dispersants, plasticizers, antioxidants, curing agents, flame retardants, heat stabilizers, ultraviolet absorbers, antistatic agents, surfactants, lubricants, mold release agents, and the like.

[0085] Liquid crystal polyester compositions can be produced, for example, by melt-kneading liquid crystal polyester and polyaryl ether ketone (and other components as needed). The method of melt-kneading is not particularly limited and may be any known mixing method. Melt-kneading may be carried out using known equipment such as a twin-screw extruder.

[0086] When manufacturing a liquid crystal polyester composition, polyaryl ether ketone can be used in various forms, such as pellets or granules. From the viewpoint of easily forming a sea-island structure in which island portions containing polyaryl ether ketone are well dispersed within sea portions containing liquid crystal polyester, pellets are preferred. It is believed that by using pellets for the polyaryl ether ketone, it can be effectively kneaded and well dispersed even in low-viscosity liquid crystal polyester.

[0087] The flow initiation temperature of the liquid crystal polyester composition may be, for example, 250°C or higher, or 270°C or higher. Alternatively, the flow initiation temperature of the liquid crystal polyester composition may be, for example, 400°C or lower, 360°C or lower, or 340°C or lower. In other words, the flow initiation temperature of the liquid crystal polyester composition may be, for example, 250°C to 400°C, 250°C to 360°C, 250°C to 340°C, 270°C to 400°C, 270°C to 360°C, or 270°C to 340°C.

[0088] The dielectric loss tangent of the liquid crystal polyester composition at 10 GHz may be, for example, 0.002 or less, preferably 0.0015 or less, and more preferably 0.001 or less.

[0089] The relative permittivity of the liquid crystal polyester composition at 10 GHz may 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 may be, for example, 2.5 or more, or 2.8 or more.

[0090] Viscosity of liquid crystal polyester composition (340°C, 1000 s) -1 The viscosity (340°C, 1000s) of the liquid crystal polyester composition may be, for example, 500 Pa·s or less, 300 Pa·s or less, 200 Pa·s or less, 100 Pa·s or less, or 90 Pa·s or less. -1 ) may be, for example, 1 Pa·s or more, and may also be 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.

[0091] The flow initiation temperature, dielectric loss tangent, and relative permittivity of the liquid crystal polyester composition are measured using the same methods as described above for the liquid crystal polyester. Furthermore, the viscosity of the liquid crystal polyester composition is measured using the same methods as described above for the polyaryl ether ketone, except for the measurement temperature.

[0092] Because liquid crystal polyester compositions exhibit excellent fluidity during melting, they can be suitably used as molding materials. Liquid crystal polyester compositions may be used, for example, as pellets.

[0093] The molded article of this embodiment contains the above-described liquid crystal polyester composition. The molded article of this embodiment may be a connector, socket, relay component, coil bobbin, optical pickup, oscillator, semiconductor package, IC tray, wafer carrier, household electrical appliance component, lighting fixture component, audio product component, optical cable ferrule, telephone component, facsimile component, modem component, separation claw, heater holder, impeller, fan gear, gear, bearing, motor component, motor case, engine component, engine room component, electrical component, automotive interior component, microwave cooking pot, heat-resistant tableware, flooring material, wall material, beam, column, roofing material, aircraft component, spacecraft component, space equipment component, nuclear reactor, marine facility component, cleaning jig, optical instrument component, valves, pipes, nozzles, filters, medical equipment component, medical material, sensor component, sanitary equipment, sports equipment, or leisure goods.

[0094] The molded article of this embodiment can be obtained, for example, by molding the above-mentioned liquid crystal polyester composition into a desired shape and performing processing treatment as necessary.

[0095] As a method for molding 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 press molding.

[0096] While preferred embodiments of this disclosure have been described above, this disclosure is not limited to the embodiments described above. [Examples]

[0097] The inventions described herein will be further explained in detail below with reference to examples, but the inventions described herein are not limited to these examples. Unless otherwise specified, percentages and parts representing content or usage are based on mass.

[0098] (Example 1-1) (1) Manufacturing of liquid crystal polyester (LCP1) Liquid crystal polyester (LCP1) was obtained using the following method. In a reactor equipped with a stirrer, torque meter, nitrogen gas inlet tube, thermometer, and reflux condenser, 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. After thoroughly purging the reactor with nitrogen gas, the temperature was raised to 140°C over 1 hour under a nitrogen gas flow, and the temperature was maintained and refluxed for 1 hour. Subsequently, the temperature was raised to 310°C over 4 hours and 35 minutes while distilling off the distilled by-product acetic acid. The reaction was considered complete when an increase in torque was observed, and the contents were removed. The flow temperature of the obtained solid was 270°C. The obtained solid was cooled to room temperature, ground in a coarse grinder, and then heated under a nitrogen atmosphere from room temperature to 250°C over 1 hour, then heated from 250°C to 286°C over 7 hours and 40 minutes, and held at 286°C for 6 hours to allow the polymerization reaction to proceed in the solid layer, yielding liquid crystal polyester (LCP1). The flow temperature (flow start temperature) of the obtained liquid crystal polyester (LCP1) was 311°C.

[0099] (2) Preparation of polyaryl ether ketone (P1) As polyaryletherketone (P1), we prepared 90g of polyetheretherketone manufactured by Victrex (PEEK, viscosity: 107 Pa·s, pellet form).

[0100] (3) Production of liquid crystal polyester composition Liquid crystal polyester compositions and pellets were manufactured using the following method. Liquid crystal polyester (LCP1) and polyaryl ether ketone (P1) were mixed in a mass ratio of 97:3 and granulated using a twin-screw extruder (PCM-30, manufactured by Ikegai Iron Works Co., Ltd.) at a cylinder temperature of 340°C to obtain pellets of the liquid crystal polyester composition. The flow initiation temperature of the obtained pellets was measured, and the results are shown in Table 1.

[0101] (4) Evaluation of liquid crystal polyester composition The liquid crystal polyester composition and molded articles were evaluated using the following method. The results are shown in Table 1. (i) Measurement of tensile strength and tensile elongation Using a Kitagawa Seiki 500×500 high-temperature vacuum press machine KVHC-II, molded parts were produced by vacuum pressing pellets with a 0.3 mm thick die at a temperature of flow start temperature + 30°C, a set pressure of 3 MPa, and a vacuum degree of 2 kPa or less. The molded parts were punched out into 9 × 56 mm strips, and the tensile strength and tensile elongation were measured using a Shimadzu Autograph AG-IS with a chuck distance of 30 mm and a tensile speed of 5 mm / min for n=6 measurements. The mean and standard deviation were calculated, and the coefficient of variation (standard deviation / mean) was determined. Measurements were performed in an environment of 23°C and 50% RH.

[0102] (ii) Dielectric measurement The relative permittivity and dielectric loss tangent were measured using a vector network analyzer (Keysight Technologies, Inc., N5290A) and a split-cylinder resonator (EM Labs, Inc., CR710). The measurements were performed in an environment of 23°C and 50% RH.

[0103] (iii) SEM images and average area of ​​the island Using the method described above, SEM images of the pellet cross-section were obtained. If a sea-island structure was observed in the SEM image, the average area of ​​the island portion was calculated using the method described above.

[0104] (Examples 1-2) The liquid crystal polyester composition was manufactured and evaluated in the same manner as in Example 1-1, except that the mixing ratio of liquid crystal polyester (LCP1) and polyaryl ether ketone (P1) was changed to 93:7 (mass ratio). The results are shown in Table 1.

[0105] (Examples 1-3) The liquid crystal polyester composition was manufactured and evaluated in the same manner as in Example 1-1, except that the mixing ratio of liquid crystal polyester (LCP1) and polyaryl ether ketone (P1) was changed to 86:14 (mass ratio). The results are shown in Table 1.

[0106] (Comparative Example 1-1) The liquid crystal polyester composition was manufactured and evaluated in the same manner as in Example 1-1, except that only liquid crystal polyester (LCP1) was used and no polyaryl ether ketone (P1) was added. The results are shown in Table 1.

[0107] (Comparative Example 2-1) The liquid crystal polyester composition was manufactured and evaluated in the same manner as in Example 1-1, except that the mixing ratio of liquid crystal polyester (LCP1) and polyaryl ether ketone (P1) was changed to 80:20 (mass ratio). The results are shown in Table 1.

[0108] Figure 1 shows an SEM image of a cross-section of the liquid crystal polyester composition of Example 1-1, and Figure 2 shows an SEM image of a cross-section of the liquid crystal polyester composition of Example 1-2.

[0109] [Table 1]

[0110] As shown in Table 1, Examples 1-1 to 1-3 confirmed that the combination of liquid crystal polyester and polyaryl ether ketone can produce molded articles with excellent fluidity, low dielectric constant and low dielectric loss tangent, and superior mechanical properties (especially tensile strength and tensile elongation). In contrast, Comparative Example 1-1 did not contain polyaryl ether ketone, and therefore could not obtain sufficient tensile strength. Also, in Comparative Example 1-2, the amount of polyaryl ether ketone was too high, resulting in insufficient fluidity and insufficient tensile strength.

[0111] Also, Example 1-1 (average area of ​​the island portion is 5.7 μm²) 2 ), Example 1-2 (average area of ​​island portion is 8.8 μm 2 ) and Examples 1-3 (average area of ​​island portion is 15.2 μm²) 2 In the following example, Example 2-1 (where the average area of ​​the island is 24.6 μm²) 2Compared to the above, the coefficient of variation of tensile strength and tensile elongation is smaller. From this result, it was confirmed that more stable mechanical properties can be obtained with a liquid crystal polyester composition that has a smaller average area of ​​island regions.

[0112] (Example 2-1) (1) Manufacturing of liquid crystal polyester (LCP2) Liquid crystal polyester (LCP2) was obtained using the following method. A solid was obtained in the same manner as in Example 1-1 (1) for the production of liquid crystal polyester (LCP1). The flow temperature of the obtained solid was 270°C. The obtained solid was cooled to room temperature, pulverized in a coarse grinder, and then heated under a nitrogen atmosphere from room temperature to 250°C over 1 hour, then heated from 250°C to 280°C over 5 hours, and held at 280°C for 6 hours to allow the polymerization reaction to proceed in the solid layer, obtaining liquid crystal polyester (LCP2). The flow temperature (flow start temperature) of the obtained liquid crystal polyester (LCP2) was 301°C.

[0113] (2) Manufacturing and evaluation of liquid crystal polyester compositions Liquid crystal polyester compositions were manufactured and evaluated in the same manner as in Example 1-1, except that liquid crystal polyester (LCP2) was used instead of liquid crystal polyester (LCP1), and the mixing ratio was changed to liquid crystal polyester (LCP2):polyaryletherketone (P1) = 93:7 (mass ratio). The results are shown in Table 2.

[0114] (Comparative Example 2-1) The liquid crystal polyester composition was manufactured and evaluated in the same manner as in Example 2-1, except that only liquid crystal polyester (LCP2) was used and no polyaryl ether ketone (P1) was added. The results are shown in Table 2.

[0115] Figure 3 shows an SEM image of a cross-section of the liquid crystal polyester composition of Example 2-1, and Figure 4 shows an SEM image of a cross-section of the liquid crystal polyester composition of Comparative Example 2-1.

[0116] [Table 2]

[0117] As shown in Table 2, Example 2-1 showed superior tensile strength and tensile elongation compared to Comparative Example 2-1. This confirms that the combination of liquid crystal polyester and polyaryl ether ketone can produce molded articles with excellent fluidity, low dielectric constant and low dielectric loss tangent, and superior mechanical properties (especially tensile strength and tensile elongation).

[0118] (Example 3-1) (1) Preparation of polyaryl ether ketone (P2) As polyaryl ether ketone (P2), we prepared polyether ether ketone 90P (PEEK, viscosity: 119 Pa·s, granular form) manufactured by Victrex.

[0119] (2) Manufacturing and evaluation of liquid crystal polyester compositions The liquid crystal polyester composition was manufactured and evaluated in the same manner as in Example 1-1, except that polyaryletherketone (P2) was used instead of polyaryletherketone (P1), and the mixing ratio of liquid crystal polyester (LCP1) and polyaryletherketone (P2) was changed to 93:7 (mass ratio). The results are shown in Table 3.

[0120] (Example 3-2) (1) Preparation of polyaryl ether ketone (P3) As the polyaryletherketone (P3), we prepared polyetheretherketone 450P (PEEK, viscosity: 401 Pa·s, pellet form) manufactured by Victrex.

[0121] (2) Manufacturing and evaluation of liquid crystal polyester compositions The liquid crystal polyester composition was manufactured and evaluated in the same manner as in Example 1-1, except that polyaryletherketone (P3) was used instead of polyaryletherketone (P1), and the mixing ratio of liquid crystal polyester (LCP1) to polyaryletherketone (P3) was changed to 97:3 (mass ratio). The results are shown in Table 3.

[0122] (Example 3-3) (1) Preparation of polyaryl ether ketone (P4) As the polyaryletherketone (P4), we prepared polyaryletherketone LMPAEK 101GRA (PAEK, viscosity: 203 Pa·s, pellet form) manufactured by Victrex.

[0123] (2) Manufacturing and evaluation of liquid crystal polyester compositions The liquid crystal polyester composition was manufactured and evaluated in the same manner as in Example 1-1, except that polyaryl ether ketone (P4) was used instead of polyaryl ether ketone (P1), and the mixing ratio of liquid crystal polyester (LCP1) to polyaryl ether ketone (P4) was changed to 93:7 (mass ratio). The results are shown in Table 3.

[0124] [Table 3]

[0125] As shown in Table 3, it was confirmed that combinations of liquid crystal polyester with other polyaryl ether ketones can also produce molded products with excellent fluidity, low dielectric constant and low dielectric loss tangent, and superior mechanical properties (especially tensile strength and tensile elongation).

Claims

1. A liquid crystal polyester containing a first monomer unit having a condensed aromatic ring, and a polyaryl ether ketone, The total content of the liquid crystal polyester and the polyaryl ether ketone is 80% by mass or more. The content of the polyaryl ether ketone is 1 part by mass or more and 18 parts by mass or less per 100 parts by mass of the liquid crystal polyester. Liquid crystal polyester composition.

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 of the total amount of all monomer units constituting the liquid crystal polyester.

4. The liquid crystal polyester composition according to claim 1, wherein the liquid crystal polyester does not have a condensed aromatic ring and further has a second monomer unit having a benzene ring.

5. The liquid crystal polyester composition according to claim 1, wherein the polyaryl ether ketone is a polyether ether ketone.

6. The sea island structure comprises a sea portion containing the liquid crystal polyester and a plurality of island portions containing the polyaryl ether, In the cross-section of the aforementioned sea-island structure, the average area of ​​the island portion is 25 μm². ２ The liquid crystal polyester composition according to claim 1, which is as follows:

7. A pellet 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 product is a connector, socket, relay component, coil bobbin, optical pickup, oscillator, semiconductor package, IC tray, wafer carrier, household electrical appliance component, lighting fixture component, audio product component, optical cable ferrule, telephone component, facsimile component, modem component, separation claw, heater holder, impeller, fan gear, gear, bearing, motor component, motor case, engine component, engine compartment component, electrical component, automotive interior component, microwave cooking pot, heat-resistant tableware, flooring material, wall material, beam, column, roofing material, aircraft component, spacecraft component, space equipment component, nuclear reactor, marine facility component, cleaning jig, optical instrument component, valves, pipes, nozzles, filters, medical equipment component, medical material, sensor component, sanitary equipment, sports equipment, or leisure goods.

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