JP2003171538A - Liquid crystal polyester resin composition - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal polyester resin composition which is excellent in sliding properties, mechanical strengths, and heat resistance and gives a molded article with a good appearance. <P>SOLUTION: This polyester resin composition comprises (A) 100 pts.wt. totally aromatic liquid crystal polyester with a melting point of 300°C or higher, (B) 5-100 pts.wt. talc with an apparent specific gravity of 0.35-2.0 g/cm<SP>3</SP>, (C) 5-100 pts.wt. fibrous substance with an average fiber diameter of 4-12 μm, and (D) 1-100 pts.wt. polytetrafluoroethylene. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to slidability, heat resistance,
The present invention relates to a liquid crystal polyester resin composition which is excellent in the appearance of molded products. For more details, connectors, bobbins,
The present invention relates to a liquid crystal polyester resin composition that can be used in various applications such as electric and electronic parts such as cases and automobile parts.

[0002]

Liquid crystal polyester resin is a copolymer of para-hydroxybenzoic acid and 6-hydroxy-2-naphthoic acid, para-hydroxybenzoic acid, 4,4'-dihydroxybiphenyl and terephthalic acid, isophthalic acid. Represented by coalescing, its excellent fluidity, heat resistance, rigidity,
Due to physical properties such as dimensional accuracy, demand is expanding in recent years mainly for applications such as electric and electronic parts.

Various compositions of thermotropic liquid crystal polymer represented by wholly aromatic polyester and polytetrafluoroethylene (hereinafter abbreviated as PTFE) have been variously tried (Japanese Patent Publication No. 4-5693). , JP-A-5-105804). When PTFE is blended with the thermotropic liquid crystal polymer, the composition has a reduced coefficient of friction and improved slidability, but has a drawback that the elastic modulus is reduced. Also,
Like the thermotropic liquid crystal polymer, the composition has large anisotropy, and for the purpose of improving the anisotropy, a method of incorporating a fibrous substance such as glass fiber into the composition to improve the rigidity has been conventionally performed. Although the elastic modulus is improved, the effect of improving anisotropy is small. When a plate-like substance such as talc is added, the effect of improving the anisotropy is great, but the effect of improving the strength and elastic modulus is small. Therefore, if a fibrous substance such as glass fiber and a plate-like substance such as talc are combined and blended, the strength,
It is considered that a composition that is relatively balanced can be obtained by improving the elastic modulus and anisotropy, but unexpectedly, none of them could satisfy all of these properties.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a liquid crystal polyester resin composition which is excellent in slidability, mechanical strength and heat resistance and has a good appearance of molded articles.

[0005]

As a result of intensive studies to solve the above problems, the present inventor has found that at least a liquid crystal polyester (A), talc (B), a fibrous substance (C), and It has been found that a liquid crystal polyester resin composition having excellent slidability, mechanical strength, heat resistance, appearance of a molded article, etc. can be obtained by blending polytetrafluoroethylene (D) in a specific ratio, and the present invention Has been completed.

That is, the present invention comprises at least the component (A),
A liquid crystal polyester resin composition comprising (B), (C) and (D), and having an apparent specific gravity of 0.35 as component (B) relative to 100 parts by weight of liquid crystal polyester (A).
5 to 100 parts by weight of talc of 2.0 g / cm ³ and fibrous substance 5 having an average fiber diameter of 4 to 12 μm as component (C)
100 parts by weight, and PTFE 1-10 as component (D)
The present invention relates to a liquid crystal polyester resin composition characterized by comprising 0 parts by weight.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The necessary items for carrying out the present invention will be specifically described below.

The liquid crystal polyester resin composition of the present invention contains at least a liquid crystal polyester (A), talc (B), a fibrous substance (C), and PTFE (D).

In the liquid crystal polyester resin composition of the present invention, the blending ratio of each component is preferably such that the apparent specific gravity of the component (B) is 0.35 to 2. 5 relative to 100 parts by weight of the liquid crystal polyester (A). 5 to 100 parts by weight of 0 g / cm ³ talc, and an average fiber diameter of 4 as component (C)
5 to 100 parts by weight of a fibrous substance having a particle size of 12 μm, and 1 to 100 parts by weight of PTFE as the component (D).

Liquid crystalline polyester (A) used in the present invention
Is a thermotropic liquid crystal polymer, polyester.

Liquid crystalline polyester (A) used in the present invention
Examples thereof include those obtained by reacting an aromatic dicarboxylic acid, an aromatic diol, and an aromatic hydroxycarboxylic acid, those obtained by reacting a different aromatic hydroxycarboxylic acid, and an aromatic dicarboxylic acid and nuclear substitution. Those obtained by reacting an aromatic diol, those obtained by reacting a polyester such as polyethylene terephthalate with an aromatic hydroxycarboxylic acid, and the like,
It forms an anisotropic molten phase at a temperature of 400 ° C. or lower. Incidentally, instead of these aromatic dicarboxylic acids, aromatic diols, and aromatic hydroxycarboxylic acids, their ester-forming derivatives may be used.

Liquid crystalline polyester (A) used in the present invention
As the repeating structural unit of, it is possible to exemplify a repeating structural unit derived from the following aromatic dicarboxylic acid, a repeating structural unit derived from an aromatic diol, a repeating structural unit derived from an aromatic hydroxycarboxylic acid, and the like, It is not limited to these.

Examples of the repeating structural unit derived from an aromatic dicarboxylic acid include the following structures.

[0014]

[Chemical 7]

Further, examples of the repeating structural unit derived from the aromatic diol include the following structures.

[0016]

[Chemical 8]

Further, examples of the repeating structural unit derived from the aromatic hydroxycarboxylic acid include the following structures.

[0018]

[Chemical 9]

Liquid crystalline polyester (A) used in the present invention
From the viewpoint of the balance of heat resistance, mechanical properties, processability, etc., a particularly preferable liquid crystal polyester is one containing a repeating structural unit represented by the following structural formula [7].

[0020]

[Chemical 10]

The above repeating structural unit (structural formula [7])
As the liquid crystal polyester (A) containing, for example, liquid crystal polyesters containing a combination of the following repeating units and the like can be mentioned. Note that the present invention is not limited to these examples.

[0022]

[Chemical 11]

[0023]

[Chemical 12]

[0024]

[Chemical 13]

[0025]

[Chemical 14]

[0026]

[Chemical 15]

[0027]

[Chemical 16]

[0028]

[Chemical 17]

Liquid Crystal Polyester Used in the Present Invention
For the production method, for example, JP-B-47-47870, JP-B-63-3888, and JP-B-63-38.
No. 91, Japanese Patent Publication No. 56-18016, Japanese Patent Publication No. 2
-51523 and Japanese Patent Publication No. 7-47625. Of these, a combination of is preferable, and a combination of is more preferable.

Liquid crystalline polyester (A) used in the present invention
Is preferably a wholly aromatic polyester having a melting point of 300 ° C. or higher.

Liquid crystalline polyester (A) used in the present invention
And (group a), (group b) of the following structural formula,
Consists of repeating units selected from (group c),
(Group a) is structural formula [1] and / or structural formula [2],

[0032]

[Chemical 18]

(Group b) is structural formula [3] and / or structural formula [4], and / or structural formula [5], and / or structural formula [6],

[0034]

[Chemical 19]

(Group c) is structural formula [7],

[0036]

[Chemical 20]

The molar ratio of repeating units of each structural formula is [2].
/ [1] = 0 to 1.5 in the molar ratio range, [[3] +
[4] / [[5] + [6]] is in the range of 1 to 10 and the total molar ratio of (group a) to the total molar ratio of (group b) is substantially 1: 1. Yes, and
(Group c) / (group a) is in the range of 1 to 6 molar ratio, [4] / [3] is in the range of 0 to 2 molar ratio,
[6] / [5] is preferably in the range of 0 to 2 molar ratio. The liquid crystal polyester resin having such a molar ratio is excellent in mechanical properties such as mechanical properties, heat resistance and fluidity, and is highly balanced.

Next, the talc (B) used in the present invention is
Talc has an apparent specific gravity of 0.35 g / cm ³ or more.

Such talc (B) may be talc obtained by only crushing ore and not being compressed, or compressed fine powder talc. In the case of uncompressed talc, the average particle size is preferably 6 to 20 μm, more preferably 8 to 15 μm.

Further, in the present invention, it is preferable to use compressed fine powder talc as the talc (B).

The "compressed fine powder talc" referred to in the present invention is an example.
For example, it exists within and / or between fine talc particles.
Initial degassing of gas such as air by appropriate means such as a vacuum device
After that, it is further compressed by a compressible means such as a roller or a press.
An example is talc in a stable agglomerated state that is further compressed and degassed.
The average particle size before compression is preferably 0.2 to 10 μm.
m, more preferably 0.5 to 5 μm, and have an apparent specific gravity
0.1-0.4g / cm ^ThreeBy compressing so-called fine talc
And degass more than 30% of the gas contained in talc.
Therefore, the average particle size of compressed fine powder talc after compression is preferable.
150 μm or more, more preferably 150 to 600 μm
m, and apparent specific gravity is preferably 0.4 g / cm^ThreeSince
Above, more preferably 0.45 to 1.2 g / cm^ThreeRange of
Is.

In the present invention, it is preferable to use the above-mentioned compressed fine powder talc because the resin composition has good uniform dispersibility, excellent kneading workability and mechanical properties.

The amount of talc (B) added is preferably 5 to 100 relative to 100 parts by weight of the liquid crystal polyester (A).
Parts by weight, more preferably 10 to 80 parts by weight. When the addition amount of talc (B) is in such a range, a resin composition excellent in kneading workability and mechanical properties (strength, toughness, etc.) can be obtained.

Next, the fibrous substance (C) used in the present invention is preferably a fibrous substance having an average fiber diameter of 4 to 12 μm.

Examples of the fibrous substance (C) include glass fiber, carbon fiber (PAN carbon fiber, pitch carbon fiber), organic synthetic fiber (aromatic polyamide fiber, etc.), metal fiber (stainless fiber, aluminum fiber). Etc.), inorganic fibers (silicon carbide fibers, potassium titanate fibers, alumina fibers, etc.), natural ore fibers (wollastonite, asbestos, etc.), etc., among which glass fibers and carbon fibers are preferable, and glass fibers are particularly preferable. is there.

The fibrous substance (C) is preferably surface-treated with a treating agent such as a coupling agent such as a silane-based or titanate-based agent, and particularly, it is preferably surface-treated with aminosilane or epoxysilane. preferable. Further, it is also preferable that it is treated with a sizing agent or a coating agent of epoxy type, urethane type, acrylic type or the like.

As the aminosilane coupling agent,
For example, γ- (2-aminoethyl) aminopropylmethyldimethoxysilane, γ- (2-aminoethyl) aminopropyltrimethoxysilane and the like can be mentioned.

Examples of the epoxysilane coupling agent include γ-glycidoxypropylmethyldimethoxysilane, γ-glycidoxypropyltrimethoxysilane and the like.

Examples of the epoxy-based sizing agent or coating agent include bisphenol A type epoxy and novolac type epoxy.

Examples of the urethane type sizing agent or coating agent include tolylene diisocyanate type urethane and hexamethylene diisocyanate type urethane.

The average fiber diameter of the fibrous substance (C) used in the present invention is preferably 4 to 12 μm, more preferably 5
Is in the range of up to 11 μm. When the average fiber diameter of the fibrous substance (C) is in such a range, the reinforcing effect and the anisotropy reducing effect when used in combination with talc are excellent, which is preferable.

The amount of the fibrous substance (C) added is preferably 5 to 1 with respect to 100 parts by weight of the liquid crystal polyester (A).
The amount is 00 parts by weight, more preferably 10 to 80 parts by weight.
If the addition amount of the fibrous substance (C) is in such a range, excellent strength and toughness can be obtained.

In the resin composition of the present invention, the total amount of talc (B) and fibrous substance (C) added is preferably 1 with respect to 100 parts by weight of the liquid crystal polyester (A).
It is 5 to 200 parts by weight, more preferably 20 to 180 parts by weight, and particularly preferably 25 to 150 parts by weight.

As the PTFE (D) used in the present invention, various commercially available grades can be used, and the shape thereof is not particularly limited, such as powder, granules, fibrous shape, and the like. 50 μm powdered PTFE is preferred.

The PTFE (D) is the Japanese Industrial Standard (JI
S) The decomposition starting temperature measured by a thermobalance according to K7120 is preferably 320 ° C. or higher, more preferably 350 ° C. or higher. The decomposition start temperature is measured in a nitrogen atmosphere at a temperature rising rate of 20 ° C./min.

The amount of PTFE (D) added is 1 to 100 parts by weight, based on 100 parts by weight of the liquid crystal polyester (A).
It is preferably 2 to 80 parts by weight. When the amount of PTFE (D) added is in such a range, excellent slidability, strength and fluidity can be obtained.

The liquid crystal polyester resin composition of the present invention may be added to the liquid crystal polyester resin composition of the present invention within the range not impairing the object of the present invention, if necessary.
Furthermore, antioxidants, heat stabilizers, light stabilizers, flame retardants, lubricants, antistatic agents, inorganic or organic colorants (dyes, pigments), rust inhibitors, cross-linking agents, plasticizers, fluorescent agents, surface smoothing. Agent,
Various additives such as a surface gloss improver and a release agent (fluorine resin, polyolefin wax, etc.) and other thermoplastic resins can be added during the manufacturing process or in the subsequent processing process.

The liquid crystal polyester resin composition of the present invention is
It is obtained by blending at least the above liquid crystal polyester (A), talc (B), fibrous substance (C) and PTFE (D), and melt-kneading. Various known methods can be used for the blending and the melt kneading. The blending and melt-kneading may be performed in a batch system or a continuous system, and there is no particular limitation.
The order of blending and kneading can be arbitrarily selected. For example, liquid crystal polyester (A), talc (B), fibrous substance (C) and PTFE (D) may be simultaneously mixed, mixed and melt-kneaded. First, liquid crystal polyester (A) and P
After blending TFE (D) and melt-kneading, talc (B) and fibrous substance (C) may be further added and melt-kneading. Alternatively, the liquid crystal polyester (A), talc (B) and PTFE (D) may be blended and melt-kneaded, and then the fibrous substance (C) may be added and melt-kneaded. Alternatively, liquid crystal polyester (A), talc (B), and fibrous substance (C) may be blended and melt-kneaded, and then PTFE (D) may be further added and melt-kneaded.

The melting and kneading temperature can be appropriately set depending on the type of liquid crystal polyester resin used, but is usually in the range of 200 to 400 ° C.

As described above, the aspect of the present invention is a liquid crystal polyester resin composition comprising at least components (A), (B), (C) and (D), and 100 weight parts of the liquid crystal polyester (A). Talc of 5 to 10 having an apparent specific gravity of 0.35 to 2.0 g / cm ³ as the component (B) with respect to the parts.
0 parts by weight, and an average fiber diameter of 4 to 12 μm as the component (C)
A liquid crystal polyester resin composition comprising 5 to 100 parts by weight of a fibrous substance of m and 1 to 100 parts by weight of polytetrafluoroethylene as a component (D).

As another embodiment of the present invention, the above liquid crystal polyester resin composition is one in which the liquid crystal polyester (A) is a wholly aromatic polyester having a melting point of 300 ° C. or higher.

According to another aspect of the present invention, the liquid crystal polyester (A) has the following structural formula (group a),
A repeating unit selected from (group b) and (group c), wherein (group a) is structural formula [1], and /
Or structural formula [2],

[0063]

[Chemical 21]

(Group b) is structural formula [3] and / or structural formula [4], and / or structural formula [5], and / or structural formula [6],

[0065]

[Chemical formula 22]

(Group c) is structural formula [7],

[0067]

[Chemical formula 23]

The molar ratio of repeating units of each structural formula is [2].
/ [1] = 0 to 1.5 in the molar ratio range, [[3] +
[4]] / [[5] + [6]] = 1 to 10 molar ratio, and the total molar ratio of (group a) to the total molar ratio of (group b) is substantially 1: 1. Yes, and
(Group c) / (group a) = 1 to 6 molar ratio range, [4] / [3] = 0 to 2 molar ratio range,
The present invention relates to each of the above liquid crystal polyester resin compositions in the range of [6] / [5] = 0 to 2 molar ratio.

As another aspect of the present invention, the above-mentioned liquid crystal polyester resin composition wherein the talc (B) is compressed fine powder talc having an apparent specific gravity of 0.4 to 1.4 g / cm ^3. Is.

As another aspect of the present invention, the compressed fine powder talc relates to the above liquid crystal polyester resin composition obtained from talc having an average particle diameter of 0.5 to 5 μm.

As another aspect of the present invention, the fibrous substance (C) is a liquid crystal polyester resin composition as described above, which is a glass fiber.

As another embodiment of the present invention, polytetrafluoroethylene (D) is a product of Japanese Industrial Standard (JI
S) The above liquid crystal polyester resin composition having a decomposition start temperature of 350 ° C. or higher measured by a thermobalance according to K7120.

Another aspect of the present invention is a liquid crystal polyester resin composition comprising at least components (A), (B), (C) and (D), and 100 parts by weight of the liquid crystal polyester (A). On the other hand, as the component (B), talc 5-100 having an apparent specific gravity of 0.35 to 2.0 g / cm ³
Weight part, and average fiber diameter of 4 to 12 μm as component (C)
5 to 100 parts by weight of the fibrous substance and 1 to 100 parts by weight of polytetrafluoroethylene as the component (D), which is a liquid crystal polyester resin composition,
The liquid crystal polyester (A) is a wholly aromatic polyester having a melting point of 300 ° C. or higher, and comprises a repeating unit selected from (group a), (group b) and (group c) of the following structural formulas, and (group a) is Structural formula [1],
And / or structural formula [2],

[0074]

[Chemical formula 24]

(Group b) is structural formula [3] and / or structural formula [4], and / or structural formula [5], and / or structural formula [6],

[0076]

[Chemical 25]

(Group c) is structural formula [7],

[0078]

[Chemical formula 26]

The molar ratio of repeating units of each structural formula is [2].
/ [1] = 0 to 1.5 in the molar ratio range, [[3] +
[4]] / [[5] + [6]] = 1 to 10 molar ratio, and the total molar ratio of (group a) to the total molar ratio of (group b) is substantially 1: 1. Yes, and
(Group c) / (group a) = 1 to 6 molar ratio range, [4] / [3] = 0 to 2 molar ratio range,
[6] / [5] = 0 to 2 molar ratio range, talc (B) is a compressed fine powder talc having an apparent specific gravity of 0.4 to 1.4 g / cm ³ , and the compressed fine powder talc is an average particle. Fibrous substance (C) obtained from talc having a diameter of 0.5 to 5 μm
Is a glass fiber, and polytetrafluoroethylene (D) has a decomposition start temperature of 350 ° C. or higher measured by a thermobalance according to Japanese Industrial Standard (JIS) K7120. It depends on.

[0080]

EXAMPLES The present invention will be described more specifically below with reference to Examples and Comparative Examples, but the scope of the present invention is not limited to these Examples. In the following, "%" represents% by weight and "part" represents parts by weight, unless otherwise specified.

[Synthesis Example 1] Synthesis of liquid crystal polyester of LCP-1 55.1 g (0.5 mol) of hydroquinone, 4,4'-
Dihydroxybiphenyl 93.1 g (0.5 mol), terephthalic acid 116.3 g (0.7 mol), 2,6-naphthalenedicarboxylic acid 64.9 g (0.3 mol), 4-hydroxybenzoic acid 621.5 g ( 4.5 mol) and 612.5 g (6 mol) of acetic anhydride were charged into a reaction vessel equipped with a condenser and a stirrer, the temperature was raised with stirring under a nitrogen gas atmosphere, and the mixture was refluxed at 170 ° C. for 60 minutes. Then, the reaction vessel was gradually raised to 370 ° C. over 4 hours while removing the by-product acetic acid, and the reaction system was further heated to 370 ° C. at 25 kPa.
The pressure was reduced to. Further, the pressure was reduced to 0.5 to 1 kPa over 2 hours while removing acetic acid as a by-product at that temperature to carry out polymerization.

Then, polymerization was carried out at 370 ° C. for 1 hour.
Polymerization was performed under strong stirring while removing by-product acetic acid during this period, and then the system was gradually cooled, and the polymer obtained at 200 ° C. was taken out of the system. The melting point was measured using a differential scanning calorimeter (DSC7 manufactured by Perkin Elmer Co., Ltd.) (J
According to IS K 7121), it was 350 ° C.

[Synthesis Example 2] Synthesis of liquid crystal polyester of LCP-2 Hydroquinone 55.1 g (0.5 mol), 4,4'-
Dihydroxybiphenyl 93.1 g (0.5 mol), terephthalic acid 116.3 g (0.7 mol), 2,6-naphthalenedicarboxylic acid 43.3 g (0.2 mol), 4,
With LCP-1 except that 24.2 g (0.1 mol) of 4'-biphenyldicarboxylic acid, 621.5 g (4.5 mol) of 4-hydroxybenzoic acid and 612.5 g (6 mol) of acetic anhydride were used. Polymerization was performed in the same manner. The melting point measured in the same manner as above was 365 ° C.

[Properties of Talc Used in Examples or Comparative Examples] Properties of talc used in Examples or Comparative Examples are as follows. Talc-1: Fine powder talc having an apparent specific gravity of 0.20 g / cm ³ , and an average particle diameter of 2.7 μm. Talc-2: Talc obtained by compressing the fine powder talc of the above talc-1, compressed fine powder talc having an apparent specific gravity of 0.8 g / cm ³ , and an average particle diameter of 350 μm. Talc-3: Talc obtained by compressing the fine powder talc of the above talc-1, compressed fine powder talc having an apparent specific gravity of 0.5 g / cm ³ , and an average particle diameter of 250 μm. GF-1: Glass fiber having an average fiber diameter of 6 μm and a fiber length of 3 mm, which is surface-treated with γ- (2-aminoethyl) aminopropyltrimethoxysilane and treated with tolylene diisocyanate urethane (urethane sizing agent) . GF-2: Glass fiber having an average fiber diameter of 10 μm and a fiber length of 3 mm, which is surface-treated with γ- (2-aminoethyl) aminopropyltrimethoxysilane and then treated with tolylene diisocyanate urethane (urethane sizing agent) . GF-3: Glass fiber having an average fiber diameter of 13 μm and a fiber length of 3 mm, which has been surface-treated with γ- (2-aminoethyl) aminopropyltrimethoxysilane and then treated with tolylene diisocyanate urethane (urethane type sizing agent). . PTFE: average particle size 32 μm, decomposition start temperature 420 ° C.
Polytetrafluoroethylene.

[Examples 1 to 10] The above LCP-1 and LC
P-2 and LCP-3 and talc-1, talc-2 and talc-3 were compounded at the compounding ratios shown in Table 1 and Table 2, extruded at 300 to 360 ° C and pelletized. Using the obtained pellets, 2 mm thick x 6 with an injection molding machine
A 0 mm × 60 mm square plate was injection molded. The obtained square plate was cut into a width of 10 mm in the direction of flow and at right angles, and JIS K7 was used under the conditions of a span of 30 mm and a test speed of 1 mm / min.
A bending test was performed according to 171. In addition, a 3.2 mm thick × 12.5 mm × 125 mm square bar was injection molded, and the load deflection temperature was measured (1.82 MPa load) using the molded product in accordance with ASTM D-638. Also, J
A hollow cylinder test piece shown in (b) of ISK7218 method A was molded, and the obtained test piece was mated with a Suzuki friction and wear tester under the conditions of 300 mm / sec and a surface pressure of 0.98 MPa. The material was S45C of steel, and the dynamic friction coefficient was measured. The evaluation results of the liquid crystal polyester resin composition of the present invention are shown in Tables 1 and 2.

[Comparative Examples 1 to 6] Extrusion, pelletization and injection molding were carried out in the same manner as in the examples with the compounding ratios shown in Table 3, and the same evaluation was carried out. The evaluation results are shown in Table 3.

[0087]

[Table 1]

[0088]

[Table 2]

[0089]

[Table 3]

[0090]

According to the present invention, it is possible to provide a liquid crystal polyester resin composition which is excellent in slidability, heat resistance, appearance of molded articles and the like. The liquid crystal polyester resin composition of the present invention can be used in a wide variety of fields such as electrical and electronic parts such as connectors, bobbins and cases.

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 4F072 AA06 AA09 AB06 AB08 AB09                       AB10 AB11 AB15 AD07 AD37                       AE00 AF06 AK15 AL02 AL11                 4J002 BD152 CF161 DJ046 DL007                       FA047 GN00 GQ01

Claims (8)

[Claims] 1. At least components (A), (B) and (C)
And (D), which has an apparent specific gravity of 0.35 to 2.0 g / cm as the component (B) with respect to 100 parts by weight of the liquid crystal polyester (A).
5 to 100 parts by weight of talc ³ and 5 to 100 parts by weight of a fibrous substance having an average fiber diameter of 4 to 12 μm as the component (C),
And polytetrafluoroethylene 1 to 1 as component (D)
A liquid crystal polyester resin composition comprising 100 parts by weight. 2. The liquid crystal polyester (A) has a melting point of 300.
The liquid crystal polyester resin composition according to claim 1, which is a wholly aromatic polyester having a temperature of ℃ or more. 3. The liquid crystal polyester (A) comprises a repeating unit selected from the following structural formulas (group a), (group b) and (group c), and (group a) is structural formula [1], and / Or structural formula [2], (Group b) is structural formula [3] and / or structural formula [4], and / or structural formula [5], and / or structural formula [6], (Group c) is structural formula [7], and The molar ratio of repeating units of each structural formula is [2] / [1] = 0
To [1.5] and a molar ratio of [[3] + [4]] /
[[5] + [6]] = 1 to 10 molar ratio range,
The total molar ratio of (group a) to the total molar ratio of (group b) is substantially 1: 1, and further, (group c) / (group a) = 1 to 6 molar ratio,
[4] / [3] = 0 to 2 molar ratio range, [6] /
The liquid crystal polyester resin composition according to claim 1, wherein [5] = 0 to 2 in a molar ratio range. 4. Talc (B) has an apparent specific gravity of 0.4 to
The liquid crystalline polyester resin composition according to claim 1, which is a compressed fine powder talc of 1.4 g / cm ³ . 5. The compressed fine powder talc has an average particle size of 0.5 to
5. Obtained from talc of 5 μm.
The liquid crystal polyester resin composition described. 6. The liquid crystal polyester resin composition according to claim 1, wherein the fibrous substance (C) is glass fiber. 7. The polytetrafluoroethylene (D) is
The liquid crystal polyester resin composition according to claim 1, which has a decomposition initiation temperature of 350 ° C. or higher as measured by a thermobalance according to Japanese Industrial Standard (JIS) K7120. 8. At least components (A), (B) and (C)
And (D), which has an apparent specific gravity of 0.35 g to 2.0 g / c as the component (B) with respect to 100 parts by weight of the liquid crystal polyester (A).
5 to 100 parts by weight of talc of m ³ , 5 to 100 parts by weight of a fibrous substance having an average fiber diameter of 4 to 12 μm as the component (C), and 1 to 100 parts by weight of polytetrafluoroethylene as the component (D). A liquid crystal polyester resin composition, wherein the liquid crystal polyester (A) is a wholly aromatic polyester having a melting point of 300 ° C. or higher, and from the following structural formulas (group a), (group b), and (group c): Consists of selected repeating units, wherein (group a) is structural formula [1] and / or structural formula [2], (Group b) is structural formula [3] and / or structural formula [4], and / or structural formula [5], and / or structural formula [6], (Group c) is structural formula [7], and The molar ratio of repeating units of each structural formula is [2] / [1] = 0
To [1.5] and a molar ratio of [[3] + [4]] /
[[5] + [6]] = 1 to 10 molar ratio range,
The total molar ratio of (group a) to the total molar ratio of (group b) is substantially 1: 1, and further, (group c) / (group a) = 1 to 6 molar ratio,
[4] / [3] = 0 to 2 molar ratio range, [6] /
[5] = 0 to 2 molar ratio, talc (B) is a compressed fine powder talc having an apparent specific gravity of 0.4 to 1.4 g / cm ³ , and the compressed fine powder talc has an average particle diameter of 0.5. ~ 5μ
m of talc, the fibrous substance (C) is glass fiber, and the polytetrafluoroethylene (D) has a decomposition starting temperature of 350 ° C. measured by a thermobalance according to Japanese Industrial Standard (JIS) K7120. A liquid crystal polyester resin composition characterized by the above.