JP3111471B2 - Liquid crystalline polymer resin composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Applications> The present invention is a liquid crystal having excellent heat resistance, moldability, fluidity, high mechanical properties, low mechanical anisotropy, small deformation, and excellent surface appearance. The present invention relates to a conductive polymer resin composition.

<Prior art> In recent years, there has been an increasing demand for higher performance of plastics, and a number of polymers having various new properties have been developed. Among them, optically anisotropic liquid crystalline polyester has excellent chemical resistance. And mechanical properties.

As the polymer forming these anisotropic molten phases, for example, a liquid crystalline polyester obtained by copolymerizing p-hydroxybenzoic acid with polyethylene terephthalate (JP-A-49-72393)
Publication), p-hydroxybenzoic acid and 6-hydroxy-
Liquid crystalline polyester obtained by copolymerizing 2-naphthoic acid (JP-A-54-77691) and liquid crystalline polyester obtained by copolymerizing p-hydroxybenzoic acid with 4,4'-dihydroxybiphenyl, terephthalic acid and isophthalic acid (57
-24407) and the like.

These liquid crystalline polyesters have large mechanical anisotropy typified by the dimensional accuracy of a molded article. This is known from JP-A-63-146959.

<Problems to be Solved by the Invention> However, the plate-like powders described in the above-mentioned publications have a wide range, and even if the specific ones are used, dimensional accuracy, heat deformation amount, etc. Although the surface characteristics were improved, the impact resistance and heat resistance were insufficient.

Therefore, the present invention solves the above problems, heat resistance, moldability, excellent fluidity, mechanical properties, especially high impact resistance,
It is an object to obtain a liquid crystalline polymer resin composition having small mechanical anisotropy and deformation and excellent surface appearance.

<Means for Solving the Problems> The present inventors have conducted intensive studies to solve the above-described problems, and as a result, when a specific mica powder which is extremely limited to liquid crystalline polyester and liquid crystalline polyesteramide is blended,
The present inventors have found that a molded article having extremely small mechanical anisotropy and deformation, excellent ductility and heat resistance, and a composition excellent in mechanical strength and especially impact resistance can be obtained, and have reached the present invention.

That is, according to the present invention, (B) the bulk specific gravity is 0.18 with respect to 100 parts by weight of the liquid crystalline polyester resin and / or the liquid crystalline polyesteramide resin forming the anisotropic molten phase.
A liquid crystalline polymer resin composition containing 1 to 200 parts by weight of mica having an average particle size of 10 to 15 μm.

In the present invention, the most important point is that the liquid crystalline polyester and / or the liquid crystalline polyester amide have a very limited range, that is, a bulk specific gravity of 0.18 to 0.23,
The point is that mica having an average particle size of 10 to 15 μm is used. Only when such mica is used, a liquid crystalline polyester resin and / or a liquid crystalline polyesteramide resin can be obtained which has excellent heat resistance typified by deflection temperature under load, and particularly excellent impact resistance. is there.

The (A) liquid crystalline polyester resin and / or liquid crystalline polyester amide resin used in the present invention is a polyester resin and / or polyester amide resin that forms an anisotropic molten phase, for example, p-hydroxybenzoic acid / polyethylene Terephthalate liquid crystalline polyester, p-hydroxybenzoic acid / 6-hydroxy-2-naphthoic acid liquid crystalline polyester, p-hydroxybenzoic acid
4,4,4'-dihydroxybiphenyl / terephthalic acid / isophthalic acid-based liquid crystalline polyester and 6-hydroxy-
Preferred examples include 2-naphthoic acid / p-aminophenol / terephthalic acid-based liquid crystalline polyesteramide.

Among them, a liquid crystalline polyester comprising the following structural units (I), (II) and (IV) or (I), (II), (III) and (IV) is preferable.

O—R ₁ —O (II) O—CH ₂ CH ₂ —O (III) CO—R ₂ —CO (IV) (where R ₁ in the formula is R ₂ represents one or more groups selected from And at least one group selected from X is a hydrogen atom or a chlorine atom. The structural unit (IV) is substantially equimolar to the sum of the structural units (II) and (III). The structural unit (I) is a structural unit of a polyester formed from p-hydroxybenzoic acid, and the structural unit (II)
Is 4,4'-dihydroxybiphenyl, 3,3 ', 5,5'-tetramethyl-4,4'-dihydroxybiphenyl, hydroquinone, t-butylhydroquinone, phenylhydroquinone, 2,6-dihydroxynaphthalene, 2 Structural units formed from, 7-dihydroxynaphthalene, 2,2-bis (4-hydroxyphenyl) propane and 4,4'-dihydroxydiphenyl ether, structural unit (III) represents a structural unit formed from ethylene glycol, The structural units (IV) are terephthalic acid, isophthalic acid, 4,4'-diphenyldicarboxylic acid, 2,6-naphthalenedicarboxylic acid, 1,2-bis (phenoxy) ethane-4,4'-dicarboxylic acid and 1,2
Each of the structural units generated from one or more aromatic dicarboxylic acids selected from -bis (2-chlorophenoxy) ethane-4,4'-dicarboxylic acid is shown.

When the structural unit (III) is included, the structural unit generated from 4,4′-dihydroxybiphenyl is the structural unit (II). When the structural unit (III) is not included, the structural unit (II) is 4,4 ′. '-Dihydroxybiphenyl and
Structural units generated from 2,6-dihydroxynaphthalene are preferred, and as the structural unit (IV), structural units generated from terephthalic acid are particularly preferred.

In the present invention, the above-mentioned liquid crystalline polyester which can be preferably used includes the above-mentioned structural units (I), (II) and (IV) or (I), (II), (III) and (IV)
Is a copolymer consisting of

The structural units (I), (II), (III) and (IV)
Is arbitrary. However, the following copolymerization amount is particularly preferable from the viewpoint of fluidity.

That is, when the structural unit (III) is included, the total of the structural units (I) and (II) is the sum of the structural units (I) and (I
It is preferably from 60 to 95 mol%, particularly preferably from 85 to 93 mol%, based on the total of I) and (III). In addition, the structural unit (III) is a structural unit (I), (II)
It is preferably from 40 to 5 mol%, particularly preferably from 15 to 7 mol%, based on the total of (III) and (III).
Further, the molar ratio of the structural units (I) and (II) [(I) / (I
I)] is preferably from 75/25 to 95/5, especially 83/17
Preferably it is ~ 93/7. In addition, structural units (IV)
Is substantially equimolar to the sum of the structural units (II) and (III).

On the other hand, when the structural unit (III) is not contained, the structural unit (I) is 40% of the total of the structural units (I) and (II).
It is preferably from 90 to 90 mol%, particularly preferably from 60 to 88 mol%. The structural unit (IV) is substantially equimolar to the structural unit (II).

In the liquid crystalline polyester which can be preferably used in the present invention, in addition to the above components (I) to (IV), 3,3′-diphenyldicarboxylic acid,
Aromatic dicarboxylic acids such as 4'-diphenyldicarnebonic acid and 2,2'-diphenyldicarboxylic acid, alicyclic dicarboxylic acids such as hexahydroterephthalic acid, resorcinol, chlorohydroquinone, methylhydroquinone, bis (4
Aromatic dihydroxy compounds such as -hydroxyphenyl) sulfone and ethylene oxide adducts thereof;
1,4-butanediol, 1,6-hexanediol, neopentyl glycol, 1,4-cyclohexanediol, 1,4
Aliphatic, cycloaliphatic diols such as cyclohexanedimethanol and m-oxybenzoic acid, 6-hydroxy-2
-Aromatic hydroxycarboxylic acids such as naphthoic acid, p-aminophenol, p-aminobenzoic acid, and the like may be further copolymerized in a small proportion not to impair the object of the present invention.

The liquid crystal onset temperature of the liquid crystalline polyester resin and / or the liquid crystalline polyester amide resin (A) used in the present invention is preferably 330 ° C. or less, and particularly preferably 240 to 330 ° C. from the viewpoint of fluidity and heat resistance. Is preferred.

If the liquid crystal onset temperature exceeds 330 ° C., the molding temperature must be increased, which is not practical in terms of moldability. In addition,
The liquid crystal onset temperature is a temperature at which opalescent light is emitted under shear stress on a sample stage of a polarizing microscope.

The melt viscosity is essential to be 10,000 poise or less, preferably 6,000 poise or less, and more preferably 4,000 poise or less.

When the liquid crystalline polyester containing the structural unit (III) is used, the melt viscosity is a temperature of melting point (Tm) + 10 ° C., and in other cases, a shear rate of 1,000 (1/1) at a temperature of liquid crystal onset temperature + 40 ° C. Second).

Here, the melting point (Tm) refers to the endothermic peak temperature (Tm ₁ ) observed when the polymerized polymer is measured from room temperature under a heating condition of 20 ° C./min.
Once cooled to room temperature at 0 ° C / min,
It refers to the endothermic peak temperature (Tm ₂ ) observed when the measurement is performed under the temperature rising condition of ° C./min.

The liquid crystalline polyester resin and / or the liquid crystalline polyester amide resin (A) used in the present invention include those capable of measuring the intrinsic viscosity in pentafluorophenol, in which case the concentration is 0.1 g / dl. It is preferably 0.5 dl / g or more at a value measured at 60 ° C., and in the preferable liquid crystalline polyester, when the structural unit (III) is contained, 0.5 to
3.0dl / g, 1.0 ~ 15.0d when not containing structural unit (III)
l / g is particularly preferred.

The method for producing the liquid crystalline polyester resin and / or the liquid crystalline polyester amide resin (A) in the present invention comprises:
There is no particular limitation, and it can be produced according to a known polyester or polyesteramide polycondensation method.

For example, in the production of a liquid crystalline polyester, the following methods (a) and (b) are preferably used when the structural unit (III) is not included, and the method (e) is used when the structural unit (III) is included.

(A) A method of producing from a diacylated aromatic dihydroxy compound such as p-acetoxybenzoic acid or 4,4'-diacetoxybiphenyl and an aromatic dicarboxylic acid such as terephthalic acid by deacetic acid polymerization.

(B) An acetic anhydride is reacted with an aromatic dihydroxy compound such as p-hydroxybenzoic acid and 4,4'-dihydroxybiphenyl and an aromatic dicarboxylic acid such as terephthalic acid to acylate a phenolic hydroxyl group and then to remove acetic acid. A method of producing by polycondensation reaction. However, as for 2,6-dihydroxynaphthalene, it is preferable to use 2,6-diacetoxynaphthalene.

(C) phenyl ester of p-hydroxyhydroxybenzoic acid,
A method of producing from an aromatic dihydroxy compound such as 4,4'-dihydroxybiphenyl and a diphenyl ester of an aromatic dicarboxylic acid such as terephthalic acid by a phenol removal polycondensation reaction.

(D) A desired amount of diphenyl carbonate is reacted with an aromatic dicarboxylic acid such as p-hydroxybenzoic acid and terephthalic acid to form phenyl esters, respectively.
A method in which an aromatic dihydroxy compound such as 4'-dihydroxybiphenyl is added, and the mixture is produced by a dephenol polycondensation reaction.

(E) A method of producing an oligomer or polymer comprising ethylene glycol and an aromatic dicarboxylic acid or the method of (a) or (b) in the presence of a bis (β-hydroxyethyl) ester of an aromatic dicarboxylic acid.

According to the method (e), the oligomer or polymer composed of ethylene glycol and aromatic dicarboxylic acid is randomly incorporated into the molecular chain by a transesterification reaction to obtain a liquid crystal polyester containing the structural unit (III). Conceivable.

At the time of the polymerization reaction, a catalyst may be used if necessary. Catalysts used for the polycondensation reaction include stannous acetate, tetrabutyl titanate, potassium acetate, antimony trioxide,
Metal compounds such as magnesium, sodium acetate, and zinc acetate are typical, and are particularly effective for dephenol polycondensation.

The mica (B) used in the present invention has a bulk specific gravity of 0.18 to 0.2.
3. The average particle size is 10 to 15 μm.

Here, the bulk specific gravity is in the range of 0.18 to 0.23, and if the specific gravity is less than 0.18, it is not preferable because the bite into the extruder becomes poor or the dispersion becomes poor. On the other hand, if it exceeds 0.23, mica particles are undesirably raised on the surface of the molded product, which is not preferable.

The bulk specific gravity was measured according to JIS K-6891 by placing 30 g of a sample in a measuring device having a specific gravity of 100 cc, applying vibration, measuring the amount, and calculating by the following formula.

(Formula) Sample (g) / capacity (CC) = apparent density (bulk specific gravity) The average particle size is 10 to 15 μm. If the average particle size is out of this range, mechanical properties such as impact resistance and heat resistance decrease. Not preferred.

The mica used in the present invention preferably satisfies the above-mentioned requirements in terms of the mechanical strength of the composition and has the following particle size distribution. That is, it is preferable to use particles having a relatively small number of fine powder particles of less than 5 μm, and it is preferable that the fine particle particles of less than 5 μm be 15% by weight or less, particularly 10% or less. Those having a particle size distribution of 5 to 53 μm have a particle size distribution of 80% or more, preferably 90% by weight or more.

The particle size distribution can be measured by the “washing and sieving method” according to JIS K-5101.

Further, the mica used in the present invention preferably has a loss on heating by thermogravimetric analysis of not more than 0.2% at 300 ° C, particularly preferably not more than 0.2% at 350 ° C.

If the weight loss on heating exceeds 0.2%, the mechanical strength decreases due to gas during extrusion and molding, which is not preferable. Here, the heating loss refers to a heating loss at 300 ° C. measured at a temperature rising rate of 10 ° C./min using TGA / DTA200 manufactured by Seiko Instruments Inc.

As a type of mica, a type generally called muscovite can be preferably used.

Commercially available mica that can be used in the present invention includes, for example, Mica Yamaguchi: AB-32 mica.

In addition, since the liquid crystalline polyester resin and / or the liquid crystalline polyester amide resin (A) and the mica are kneaded at a high temperature, it is preferable to use pre-dried mica to further increase the mechanical strength.

The amount of mica (B) added is determined by the amount of liquid crystalline polyester resin and / or liquid crystalline polyester amide resin (A) 100
The amount is 1 to 200 parts by weight, preferably 5 to 150 parts by weight, and if less than 1 part by weight, the effect of reducing anisotropy is insufficient, and if it exceeds 200 parts by weight, mechanical properties and moldability are increased. This is not preferable because the surface of the molded article is significantly roughened.

In the present invention, a fibrous reinforcing agent can be further added as necessary.

The feature of the present invention is that, by blending a specific mica into the liquid crystalline polyester resin and / or the liquid crystalline polyester amide resin, it shows extremely excellent impact resistance as compared with the case where other mica is used. Things.

When the fibrous reinforcing agent is further added to the composition of the present invention, the impact resistance is slightly lower than the case where it is not added, but is superior to the case where other mica is used, and the heat resistance and the tensile strength are used. Since it is possible to further improve the mechanical strength typified by the formula (1), it is preferable to selectively use them according to the required characteristics.

Examples of the fibrous reinforcing agent that can be used in the present invention include inorganic fibers such as glass fiber, carbon fiber, alumina fiber, silicon carbide fiber, ceramic fiber, asbestos fiber, gypsum fiber, and metal fiber (for example, stainless steel fiber). These may be hollow (eg, hollow glass fibers, glass microballoons, shirasu balloons, carbon balloons, etc.).

The amount of the fibrous reinforcing agent to be added may be a liquid crystalline polyester resin and / or a liquid crystalline polyester amide resin (A).
With respect to 100 parts by weight, 150 parts by weight or less is preferable, particularly preferably 5 to 100 parts by weight, and when it exceeds 150 parts by weight,
Although the mechanical properties are increased, warping of the molded article is caused by the orientation of the fibers, and the moldability is reduced.

The mica (B) and the fibrous reinforcing agent used in the present invention can be used as they are, but the surface thereof is coupled with a coupling agent such as γ-glycidoxypropyltrimethoxysilane, γ-mercaptopropyltrimethoxysilane, methyltrimethoxy. Silane, γ-anilinopropyltrimethoxysilane, hydroxypropyltrimethoxysilane,
silane coupling agents such as γ-ureidopropyltriethoxysilane, vinylacetoxysilane, or isopropyltrisisostearoyl titanate, isopropyltris (dioctylpyrophosphate) titanate, isopropyltri (N-aminoethyl-aminoethyl) titanate, tetraoctylbis Titanate coupling agents such as (ditridecyl phosphite) titanate, bis (dioctyl pyrophosphate) ethylene titanate, isopropyl tridecyl benzene sulfonyl titanate, and isopropyl tri (dioctyl phosphate) titanate; and aluminum such as acetoalkoxy aluminum diisopropylate It may be subjected to a coupling treatment with a system coupling agent or the like. It may be added and kneaded directly into a mixture of polyester resin and / or liquid crystalline polyester amide resin + mica (+ fibrous reinforcing agent).

The composition of the present invention may contain a flame retardant, an antioxidant, and a heat stabilizer (for example, hindered phenol, hydroquinone, phosphites and their substitutes) to the extent that the object of the present invention is not impaired. Absorbents (eg, resorcinol, salicylate, benzotriazole, benzophenone, etc.), lubricants and release agents (eg, montanic acid and its salts, esters, half-esters, stearyl alcohol, stearamide, and polyethylene wax), dyes (eg, nigrosine) And ordinary additives such as colorants, pigments (eg, cadmium sulfide, phthalocyanine, carbon black, etc.), plasticizers, antistatic agents, and other fillers, and other thermoplastic resins to obtain predetermined characteristics. Can be granted.

The resin composition of the present invention is preferably melt-kneaded,
Known methods can be used for the melt-kneading. For example, the composition can be melt-kneaded at a temperature of 250 to 370 ° C. using a Banbury mixer, a rubber roll machine, a kneader, a single-screw or twin-screw extruder, or the like to obtain a composition.

<Example> Hereinafter, the present invention will be described in detail with reference to examples.

Reference Example 1 994 parts by weight of p-hydroxybenzoic acid, 126 parts by weight of 4,4'-dihydroxybiphenyl, 960 parts by weight of acetic anhydride, 112 parts by weight of terephthalic acid and 216 parts by weight of polyethylene terephthalate having an intrinsic viscosity of about 0.6 dl / g The reaction vessel was equipped with a stirring blade and a distilling tube, and subjected to deacetic acid polycondensation under the following conditions.

First, under nitrogen atmosphere, 100 ~ 250 ℃ for 6 hours, 250 ~ 3
After reacting at 15 ° C for 2.0 hours, 315 ° C, 0.5mmHg for 2 hours
The reaction was further reduced for 1.0 hour to complete the polycondensation. When the polycondensation was completed, almost the theoretical amount of acetic acid was distilled off, and a liquid crystalline polyester having the following theoretical structural formula was obtained.

k / l / m / n = 80 / 7.5 / 12.5 / 20 The melting point (Tm) of this polyester was 314 ° C., and it showed good optical anisotropy at 293 ° C. or higher. The logarithmic viscosity of this polyester (measured in pentafluorophenol at a concentration of 0.1 g / dl at 60 ° C.) is 1.96 dl / g,
The melt viscosity at 1,000 ° C. and a shear rate of 1,000 (1 / second) was 910 poise.

Reference Example 2 In a reaction vessel equipped with a stirrer and a distillation tube, 994 parts by weight of p-hydroxybenzoic acid and 4,4'-dihydroxybiphenyl 223 were added.
Parts by weight, 147 parts by weight of 2,6-diacetoxynaphthalene, 299 parts by weight of terephthalic acid and 1.077 parts by weight of acetic anhydride were charged and subjected to deacetic acid polycondensation under the following conditions.

First, under nitrogen atmosphere, 100 ~ 250 ℃ for 5 hours, 250 ~ 3
After reacting at 30 ℃ for 1.5 hours, 0.5mmHg at 330 ℃ for 1.5 hours
The reaction was further reduced for 1.0 hour, and a substantially theoretical amount of acetic acid was distilled off to obtain a liquid crystalline polyester having the following theoretical structural formula.

k / l / m / n = 80 / 13.3 / 6.7 / 20 The liquid crystal onset temperature of this polyester was 296 ° C., and above this temperature, good optical anisotropy was exhibited. The logarithmic viscosity of this polyester (measured at 60 ° C. in pentafluorophenol at a concentration of 0.1 g / dl) is 5.2 dl / g and 336
The melt viscosity at 1,000 ° C. and a shear rate of 1,000 (1 / second) was 580 poise.

Examples 1 to 4 Based on 100 parts by weight of the liquid crystalline polyester (A) of Reference Examples 1 and 2, the bulk specific gravity was 0.21, and the average particle size was 12 μm, 5 μm.
Having a particle size distribution of 95% by weight or more and having a loss on heating at 300 ° C. of 0.1% by thermogravimetric analysis.
After dry-blending 4% of mica (B) (AB-32 (Yamaguchi Mica)) and fibrous reinforcing agent (C) at the ratios shown in Table 1, the mixture was heated at 310-330 ° C. using a 30 mm φ twin screw extruder. After melt-kneading, it was pelletized.

Sumitomo Nestal Injection Molding Machine Promat
40/25 (manufactured by Sumitomo Heavy Industries, Ltd.), 70 × 70 × 2 mm square plate with a cylinder temperature of 320 to 340 ° C and a mold temperature of 90 ° C, 1
A 1/2 ″ × 1/4 ″ × 2 · 1/2 ″ Izod specimen, a 1/8 ″ thick ASTM No. 1 dumbbell and a 1/2 ″ × 1/8 ″ × 5 ″ test piece were prepared.

ASTM D790 is cut from a 70 × 70 × 2 mm square plate in a resin flow direction (MD) and a right angle direction (TD) in a width of 1/2 ″ each.
The flexural modulus was measured according to the standard, and the ratio of the MD / TD flexural modulus was determined as the mechanical anisotropy ratio.

The Izod impact strength (with notch) was measured according to ASTM D-256, and the tensile strength was measured according to ASTM D-638.

The deflection temperature was measured in accordance with ASTM D648 using a test piece with a deflection temperature of 1/2 "x 1/8" x 5 ". The appearance of the molded product was visually observed and the surface of the molded product was rubbed with sandpaper. The results were shown in Table 1.

Comparative Examples 1-2 The liquid crystalline polyesters (A) of Reference Examples 1 and 2 were prepared under the conditions of a cylinder temperature of 320-340 ° C and a mold temperature of 90 ° C.
Test pieces similar to those of Nos. To 4 were molded and evaluated.
Table 1 shows the results.

Comparative Example 3 When the bulk specific gravity was 0.16 and the average particle size was less than 6 μm and less than 5 μm with respect to 100 parts by weight of the liquid crystalline polyester (A) of Reference Example 1, 40
5 to 53 μm shows a particle size distribution of 60% by weight, and a thermogravimetric analysis shows that the loss on heating at 300 ° C. is 0.57%.
% Mica (B) (A-21S (Yamaguchi Mica))
The mixture was melt-kneaded at 310 ° C. using a twin-screw extruder and then pelletized.

The pellet temperature is 320 ° C and the mold temperature is 90 ° C
A test piece was molded in the same manner as in Examples 1 to 4 under the following conditions.
An evaluation was performed. Table 1 shows the results.

Comparative Example 4 The mica (B) and the fibrous reinforcing agent (C) used in Comparative Example 3 were dry-blended at a ratio shown in Table 1 with respect to 100 parts by weight of the liquid crystalline polyester (A) of Reference Example 1. Extrusion molding was performed in the same manner as in Examples 1 to 4 and Comparative Example 3, and evaluation was performed. Table 1 shows the results.

Comparative Examples 5 and 6 Mica A-31 and A-51 listed in Table 1 (Yamaguchi Mica) based on 100 parts by weight of the liquid crystalline polyester (A) of Reference Example 1.
Was blended in an amount of 40 parts by weight, and extruded in the same manner as in Examples 1 to 4 and Comparative Examples 3 and 4, and evaluated. Table 1 shows the results.

As is clear from the results in Table 1, the resin composition containing the liquid crystalline polyester and the mica used in the present invention has high mechanical strength, particularly high impact strength, low mechanical anisotropy, and excellent surface appearance of the molded product. ing. Further, the resin composition further blended with a fibrous reinforcing agent, although slightly lower impact strength than when not blended, is superior to the case of using other mica, tensile strength, deflection temperature under load is further improved .

On the other hand, Comparative Examples 3, 5, and 6 containing mica other than those used in the present invention have low mechanical strength and impact strength.

Further, Comparative Example 4 using glass fiber also has lower mechanical strength and impact strength than the composition of the present invention.

<Effects of the Invention> The present invention provides a good resin having excellent heat resistance, moldability, and mechanical strength, particularly impact resistance, and low mechanical anisotropy and deformation by mixing a specific mica with a liquid crystal polyester. A composition is obtained.

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Claims (3)

(57) [Claims] (1) 100 parts by weight of a liquid crystalline polyester resin and / or a liquid crystalline polyesteramide resin forming an anisotropic molten phase, (B) a bulk specific gravity of 0.18 to 0.23 and an average particle diameter of 10 A liquid crystalline polymer composition containing 1 to 200 parts by weight of mica having a size of 15 μm. 2. The liquid crystalline polymer resin composition according to claim 1, wherein the mica (B) has a loss on heating at 300 ° C. of 0.2% or less in thermogravimetric analysis. 3. The liquid crystalline polyester resin of (A) comprises a liquid crystalline polyester resin comprising the following structural units (I), (II) and (IV) or structural units (I), (II) and (III):
The liquid crystalline polymer resin composition according to claim 1, which is a liquid crystalline polyester resin comprising (IV) and (IV). _{O-R 1 -O ... (II} ) O-CH 2 CH 2 -O ... (III) CO-R 2 -CO ... (IV) ( provided that, R ₁ in the formula is It represents one or more groups selected from, R ₂ is Represents a group selected from X is a hydrogen atom or a chlorine atom. The structural unit (IV) is substantially the same as the structural unit (II)
And (III) are equimolar.