JPH05331356A - Liquid crystalline plyester resin composition - Google Patents

Abstract

PURPOSE:To obtain a liquid crystalline polyester compsn. excellent in heat resistance, mechanical properties, appearance. and moldability. CONSTITUTION:The compsn. is prepd. by compounding 100 pts.wt. compsn. comprising 1-75wt.% polyphenylene ether modified by the graft copolymn. with an aminated monomer such as aminostyrene and 99-25wt.% liq. crystalline polyester with 1-200 pts.wt. non-surface-treated glass fiber having a number- average fiber diameter of 5-25mum, a number-average fiber length of 30-1,000 m, and a ratio of the number-average fiber length to the number-average fiber diameter of 2-150.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel liquid crystal polyester resin composition which can be used for molded articles by injection molding or extrusion molding.

[0002]

2. Description of the Related Art Liquid crystal polyesters, unlike crystalline polyesters such as polyethylene terephthalate and polybutylene terephthalate, do not cause entanglement even in a molten state because they have rigid molecules, and form a polydomain having a crystalline state, which results in low shear. It exhibits a behavior in which molecular chains are significantly oriented in the flow direction, and is generally called a melt-type liquid crystal (thermotropic liquid crystal) polymer. Due to this peculiar behavior, the melt fluidity is extremely excellent, and a thin-walled molded product of about 0.2 to 0.5 mm can be easily obtained, and this molded product has the advantage of exhibiting high strength and high rigidity. However, there is a problem in that the anisotropy is extremely large and the shrinkage ratio of the molded product in the resin flow direction (MD) and the shrinkage ratio of the molded product in the direction (TD) perpendicular thereto are greatly different. Further, depending on the application, higher heat resistance, higher strength and higher rigidity are required.

Another problem is that liquid crystal polyesters are generally expensive. Maintains the excellent heat resistance and mechanical properties of liquid crystal polyester, and improves the anisotropy of molded products.
Further, an inexpensive liquid crystal polyester resin composition has been strongly demanded from the market. As an attempt aimed at improving the moldability and strength of the liquid crystal polyester by blending the liquid crystal polyester with an amorphous polymer, JP-A-56-56
There is a description in JP-A-115357 in which a polymer such as polyphenylene ether is mixed with a liquid crystal polyester to improve the melt processability of the liquid crystal polyester. In addition, JP-A-2-
Japanese Patent Publication No. 97555 discloses that liquid crystal polyester is mixed with various polyarylene oxides for the purpose of improving solder heat resistance.

[0004]

However, in general, a composition obtained by blending a liquid crystalline polyester having a high molding temperature with an amorphous polymer such as polyphenylene ether having a lower molding temperature has a melt processability of the composition. However, there is a problem that the appearance of the molded product is deteriorated due to the thermal decomposition of the compounded resin during the molding process. In addition, there is a problem that mechanical properties and heat resistance of the composition are insufficient.

[0005]

The present inventors have arrived at the present invention as a result of intensive studies to solve these problems. That is, the present invention includes (A) the following (a)
To (e) a modified polyphenylene ether obtained by graft copolymerizing at least one monomer or a combination of monomers selected from the group consisting of a monomer and a combination of monomers, (B) a liquid crystal polyester and ( C) Glass fibers having a number average fiber diameter of 5 to 25 μm, a number average fiber length of 30 to 1000 μm, and a number average fiber length / number average fiber diameter of 2 to 150, and surface-untreated glass fibers were blended. The component (A) is 1 to 75% by weight, the component (B) is 99 to 25% by weight, and the component (C) is added to 100 parts by weight of the total amount of the components (A) and (B). Relates to a liquid crystal polyester resin composition having 1 to 200 parts by weight. (A) Amino group-containing styrene-based monomer. (B) Amino group-containing monomer. (C) Styrene-based monomer and amino group-containing monomer. (D) Amino group-containing styrene-based monomer and styrene-based monomer. (E) Amino group-containing styrene-based monomer and amino group-containing monomer. (However, the above-mentioned styrene-based monomers and amino group-containing monomers exclude amino group-containing styrene-based monomers.) What is the polyphenylene ether that is the raw material of the modified polyphenylene ether of the component (A) in the present invention? General formula 1

[0006]

[Chemical 1] (In the formula, R ₁ , R ₂ , R ₃ , R ₄ and R ₅ are each independently selected from hydrogen, a halogen atom, a hydrocarbon group or a substituted hydrocarbon group, and at least one of them is Hydrogen atoms, at least one of which is not a hydrogen atom.) Is a polymer obtained by oxidatively polymerizing at least one kind of a phenol compound represented by the formula (3) with oxygen or an oxygen-containing gas using an oxidative coupling catalyst.

R ₁ , R ₂ , R ₃ , R in the above general formula
Specific examples of ₄ and R ₅ include hydrogen independently,
Chlorine, bromine, fluorine, iodine, methyl group, ethyl group, n
-Or iso-propyl group, n-, iso-, sec
-Or t-butyl group, chloroethyl group, hydroxyethyl group, phenylethyl group, benzyl group, hydroxymethyl group, carboxyethyl group, methoxycarbonylethyl group, cyanoethyl group, phenyl group, chlorophenyl group, methylphenyl group, dimethylphenyl group And those selected from the group consisting of an ethylphenyl group, an allyl group, and the like.

Specific examples of the above general formula include o- or m-cresol, 2,6-, 2,5-, or 3,5-.
Dimethylphenol, 2-methyl-6-phenylphenol, 2,6-diphenylphenol, 2,6-diethylphenol, 2-methyl-6-ethylphenol,
2,3,5- or 2,3,6-trimethylphenol, 3-methyl-6-t-butylphenol, thymol, 2-methyl-6-allylphenol and the like can be mentioned. Among these compounds, preferred are 2,
6-dimethylphenol, 2,6-diphenylphenol, 3-methyl-6-t-butylphenol and 2-
Methyl-6-allylphenol may be mentioned. Especially 2,
6-Dimethylphenol is preferred. As the polyphenylene ether as a raw material of the modified polyphenylene ether of the component (A) of the resin composition of the present invention, a polymer of 2,6-dimethylphenol or 2,6-diphenylphenol and a large amount of 2,6-dimethylphenol and a small amount of Quantity part 3
-Methyl-6-t-butylphenol or 2,3,6
-Copolymers with trimethylphenol are preferred. A polymer of 2,6-dimethylphenol is particularly preferable.

Further, the component (A) of the resin composition of the present invention
As a polyphenylene ether as a raw material of the modified polyphenylene ether, a phenol compound other than the above general formula 1, for example, a polyhydroxy aromatic compound such as bisphenol-A, tetrabromobisphenol-A, resorcin, hydroquinone, and novolak resin, and the above general A copolymer with the phenol compound represented by Formula 1 can also be used.

The oxidative coupling catalyst used in the oxidative polymerization of the phenol compound is not particularly limited, and any catalyst having a polymerization ability can be used. For example, typical examples thereof include a catalyst containing cuprous chloride and a catalyst containing divalent manganese salts.

There are differences in the physical properties of the polymer obtained when the oxidative polymerization for obtaining polyphenylene ether is carried out at a temperature higher than 40 ° C. (high temperature polymerization) and at 40 ° C. or lower (low temperature polymerization). Are known. In the method for producing the raw material polyphenylene ether of the component (A) of the resin composition of the present invention, either high temperature polymerization or low temperature polymerization can be employed.

Component (A) of the thermoplastic resin composition of the present invention
In the above, as the monomer to be graft-copolymerized with the above polyphenylene ether, at least one monomer or monomer selected from the group consisting of the following monomers (a) to (e) and a combination of monomers is used. Examples include a combination of monomers. (A) Amino group-containing styrene-based monomer. (B) Amino group-containing monomer. (C) Styrene-based monomer and amino group-containing monomer. (D) Amino group-containing styrene-based monomer and styrene-based monomer. (E) Amino group-containing styrene-based monomer and amino group-containing monomer. (However, the above-mentioned styrene-based monomer and amino group-containing monomer exclude amino group-containing styrene-based monomers.)

Here, the amino group-containing styrene-based monomer is graft-copolymerizable with polyphenylene ether,
It means a styrene-based monomer containing an amino group. As the monomer, a styrene-based monomer having a primary or secondary amino group in the molecule is preferably used. In particular,
Aminostyrene and aminomethylstyrene are preferably used. Each includes various isomers. The amino group-containing styrene-based monomer can be used alone or in combination of two or more kinds.

Next, the styrene-based monomer means a compound represented by the general formula 2 excluding the amino group-containing styrene-based monomer.

[0015]

[Chemical 2] (In the formula, R ₆ , R ₇ , R ₈ , R ₉ and R ₁₀ are the same or different and each is a hydrogen atom, a halogen atom, a hydrocarbon or a substituted hydrocarbon group, a hydrocarbon oxy or a substituted hydrocarbon oxy group. And R ₁₁ represents a hydrogen atom or a lower alkyl group having 1 to 4 carbon atoms.).

R ₆ , R ₇ , R ₈ and R _{9 in the} above general formula
And specific examples of R ₁₀ include a hydrogen atom; chlorine, bromine,
Halogen atom such as iodine; Hydrocarbon group such as methyl, ethyl, propyl, vinyl, allyl, benzyl, methylbenzyl; Substituted hydrocarbon group such as chloromethyl, bromomethyl; Hydrocarbon oxy such as methoxy, ethoxy, phenoxy, monochloromethoxy Groups or substituted hydrocarbonoxy groups and the like. In addition, specific examples of R ₁₁ include a hydrogen atom and a lower alkyl group such as methyl and ethyl.

Specific examples of the styrenic monomer include styrene, 2,4-dichlorostyrene, p-methoxystyrene, p-methylstyrene, p-phenylstyrene and p-.
Divinylbenzene, p- (chloromethoxy) -styrene, α-methylstyrene, o-methyl-α-methylstyrene, m-methyl-α-methylstyrene, p-methyl-
Examples include α-methylstyrene and p-methoxy-α-methylstyrene. These may be used alone or in combination of two or more. Of these, styrene is preferably used.

Next, the amino group-containing monomer means a monomer having an amino group and capable of being graft-copolymerized with polyphenylene ether, excluding the amino group-containing styrene-based monomer. .. Examples of the monomer include a monomer having a primary or secondary amino group or a primary amide having a primary amino group. The monomer preferably includes a monomer having a primary or secondary amino group. For example, stearylamine and the like can be mentioned. Further, a monomer having a carbon-carbon double bond or triple bond in the molecule is preferable as the monomer. Particularly preferably, the monomer includes a monomer having a primary or secondary amino group and a carbon-carbon double bond or triple bond in the molecule.

Specific examples include allylamine, diallylamine, vinylimidazole, allylaniline, acrylamide, methacrylamide, N-phenylmethacrylamide. Among them, allylamine, diallylamine, vinylimidazole and the like are preferably used. Particularly, allylamine and diallylamine are preferable. The amino group-containing monomer may be used alone or in combination of two or more.

In the component (A) of the liquid crystal polyester resin composition used in the present invention, a monomer or a monomer of the above (a) to (e) is used as a copolymer component for preparing the modified polyphenylene ether. In addition to the combination of the monomers, a small amount of a monomer copolymerizable with the styrene-based monomer can be used if necessary.

Specific examples of the monomer copolymerizable with the styrene-based monomer include acrylonitrile, methacrylonitrile, fumaric acid, maleic acid, maleic anhydride,
Alkyl acrylate, especially methyl acrylate, ethyl acrylate, alkyl methacrylate, especially methyl methacrylate, ethyl methacrylate, glycidyl acrylate, glycidyl methacrylate, vinyl acetate, 2-
Vinyl naphthalene, vinyl carbazole, etc. can be mentioned. Further, derivatives of these monomers can also be used. These may be used alone or in combination of two or more.

The method for producing the modified polyphenylene ether of the component (A) of the present invention is not particularly limited. For example, suspension polymerization method, emulsion polymerization method, solution polymerization method or bulk polymerization method (in addition to the method using a polymerization tank, Any known method such as a method using an extruder is also applicable.

Specific examples of the production method thereof include Japanese Examined Patent Publications Nos. 47-47862, 48-12197, 49-5623, 52-38596 and 52-30991. As shown in FIG. 1, a method of graft-polymerizing a styrenic monomer and / or another polymerizable monomer in the presence of polyphenylene ether can be mentioned.

Alternatively, a method of obtaining a modified polyphenylene ether by melt-kneading a polyphenylene ether and an amino group-containing monomer with a radical initiator as shown below can be given as an example. Here, the radical initiator used in producing the modified polyphenylene ether is not particularly limited, and a desired one can be appropriately selected and used. For example, starting with azo compounds such as 2,2′-azobisisobutyronitonyl,
Various radical initiators such as those described in JP-A-2-160856 can be mentioned.

If desired, the modified polyphenylene ether of the component (A) in the liquid crystal polyester resin composition of the present invention may be blended with unmodified polyphenylene ether, styrene-grafted polyphenylene ether, polystyrene and the like.

The reduced viscosity η _{SP /} c (0.5) of the modified polyphenylene ether as the component (A) of the liquid crystal polyester resin composition of the present invention and the starting polyphenylene ether thereof.
The value measured at 25 ° C. for a g / dl chloroform solution) is preferably in the range of 0.30 to 0.65 dl / g. When η _SP / c is less than 0.30 dl / g, the heat resistance of the composition remarkably decreases, and when η _SP / c exceeds 0.65 dl / g, the moldability of the composition is deteriorated, which is not preferable.

The liquid crystal polyester as the component (B) of the liquid crystal polyester resin composition of the present invention is a polyester called a thermotropic liquid crystal polymer. In particular,
(1) A combination of an aromatic dicarboxylic acid, an aromatic diol, and an aromatic hydroxycarboxylic acid,
(2) A combination of different kinds of aromatic hydroxycarboxylic acids, (3) A combination of aromatic dicarboxylic acids and a nucleus-substituted aromatic diol, (4) Polyesters such as polyethylene terephthalate and aromatic hydroxycarboxylic acids And the like can be mentioned. 4
It forms an anisotropic melt at a temperature of 00 ° C. or lower. Incidentally, instead of these aromatic dicarboxylic acids, aromatic diols and aromatic hydroxycarboxylic acids, ester-forming derivatives thereof may be used. Examples of the repeating structural unit of the liquid crystal polyester include the following, but are not limited thereto. Repeating structural unit derived from aromatic dicarboxylic acid:

[0028]

[Chemical 3]

[0029]

[Chemical 4] Repeating structural units derived from aromatic diols:

[0030]

[Chemical 5]

[0031]

[Chemical 6] Repeating structural unit derived from aromatic hydroxycarboxylic acid:

[0032]

[Chemical 7] From the balance of heat resistance, mechanical properties and processability, it is a preferred liquid crystal polyester

[0033]

[Chemical 8] That includes a repeating structural unit. As a particularly preferable liquid crystal polyester, a combination of repeating structural units is represented by the following (I), (II), (III),
Examples include (IV) and (V).

[0034]

[Chemical 9]

[0035]

[Chemical 10]

[0036]

[Chemical 11]

[0037]

[Chemical formula 12]

[0038]

[Chemical 13]

The liquid crystal polyesters (I), (II),
Regarding (III) and (IV), for example, JP-B-47-47870, JP-B-63-3888, JP-B-63-3891 and JP-B-56-18, respectively.
No. 016, etc.

The glass fiber as the component (C) of the liquid crystal polyester resin composition of the present invention has a number average fiber diameter of 5 to 25 μm.
m, and the number average fiber length of 30 to 1000 μm is preferably blended. If the number average fiber diameter or number average fiber length is out of this range, the reinforcing effect of the glass fiber becomes small, and sufficient rigidity, heat resistance, processability, etc. cannot be obtained, which is not preferable.

The number average of the morphological ratio (hereinafter sometimes referred to as aspect ratio) represented by the ratio of the fiber length and the fiber diameter of the glass fiber is preferably 2 to 150. When the number average aspect ratio is out of this range, the appearance of the molded article of the composition is poor and the molding processability is unfavorable.

The glass fiber of the component (C) in the present invention has no surface treatment.

In the present invention, the intended liquid crystal polyester resin composition can be obtained by setting the composition ratio of the component (A), the component (B) and the component (C) within a specific range. .. The ratio of the component (A) to the component (B) in the present invention is preferably 1 to 75% by weight for the component (A) and 99 to 25% by weight for the component (B). More preferably, the component (A) is 5 to 60% by weight, and the component (B) is 95 to
40% by weight. If the amount of component (A) is less than 1% by weight, the improvement of the anisotropy of the composition is insufficient and there is little cost advantage, and if it exceeds 75% by weight, the heat resistance and strength of the composition are low. It becomes insufficient and is not preferable.

In the present invention, the amount of the component (C) is 1 to 200 parts by weight, preferably 2 to 100 parts by weight, based on 100 parts by weight of the total amount of the components (A) and (B). When the amount of the component (C) is less than 1 part by weight, the effect of improving the mechanical strength, heat resistance and the like of the liquid crystal polyester resin composition of the present invention is small, and the cost is small. On the other hand, if the amount of the component (C) exceeds 200 parts by weight, the molding processability of the composition will be deteriorated and the appearance of the injection molded product will be poor, such being undesirable.

In the liquid crystal polyester resin composition of the present invention, it is more preferable that the component (A) is a dispersed phase and the component (B) is a continuous phase. In this case, the composition is excellent in chemical resistance, heat resistance, mechanical properties and the like, which is preferable.

The reason why the liquid crystal polyester resin composition of the present invention exhibits excellent physical properties is not always clear, but the effect of the amino group contained in the modified polyphenylene ether exerting a chemical action on the liquid crystal polyester and the glass fiber This is probably due to the high reinforcing effect.

In the liquid crystal polyester resin composition of the present invention, an inorganic filler is optionally used. Such inorganic fillers include calcium carbonate, talc, clay, silica, magnesium carbonate, barium sulfate, titanium oxide, alumina, gypsum, carbon black, carbon fiber,
Alumina fibers, aluminum borate whiskers, potassium titanate fibers and the like are exemplified.

In the liquid crystal polyester resin composition of the present invention,
If necessary, further antioxidants, heat stabilizers, light stabilizers, flame retardants, lubricants, antistatic agents, inorganic or organic colorants, rust inhibitors, cross-linking agents, foaming agents, fluorescent agents, surface smoothing agents. Various additives such as a surface gloss improver and a release improver such as a fluororesin can be added during the manufacturing process or in the subsequent process.

The method for producing the liquid crystal polyester resin composition of the present invention includes, for example, a method of kneading each component in a molten resin component, a method of dissolving the resin component in a solvent and mixing each component in a solution, And the like, or a method of precipitating the resin composition by pouring into a solvent in which the resin component is not dissolved. Among these, from the industrial viewpoint, the method of kneading the respective components in a molten state is preferable. For melt kneading, generally used kneading devices such as a single-screw or twin-screw extruder and various kneaders can be used. A biaxial high kneader is particularly preferable.

At the time of kneading, it is preferable that the respective components are uniformly mixed in advance by an apparatus such as a tumbler or a Henschel mixer, but if necessary, the mixing is omitted, and a method of separately quantitatively supplying each to the kneading apparatus is also used. be able to. The kneaded resin composition is molded by injection molding, extrusion molding, and various other molding methods, but does not undergo the kneading process in advance, and is dry-blended during injection molding or extrusion molding and kneaded during the melt processing operation. Then, the resin composition of the present invention can be used to directly obtain a molded product. In the present invention, the component (A), the component (B) and the component (C) may be kneaded together, or the components (A) and (C) may be previously kneaded and then the component (B) may be kneaded. May be. Furthermore,
Other kneading orders are possible.

[0051]

The liquid crystal polyester resin composition of the present invention is a resin composition excellent in molding processability, heat resistance, mechanical properties, appearance and gloss, and taking advantage of such characteristics, injection molding and extrusion molding are carried out. Molded products, sheets, tubes,
It is preferably used for films, fibers, laminates, coating materials and the like.

[0052]

EXAMPLES The present invention will be described below with reference to examples, but these are merely examples and the present invention is not limited thereto.

(I) Method of measuring physical properties Physical properties were measured by kneading the composition with a PCM-30 type twin-screw extruder manufactured by Ikegai Tekko Co., Ltd. at a cylinder temperature of 300 to 340 ° C., and then manufactured by Nissei Plastic Industry Co., Ltd. Using a PS40E5ASE type injection molding machine, injection molding was performed at a molding temperature of 300 ° C to 340 ° C and a mold temperature of 110 to 130 ° C.

Reduced viscosity of polyphenylene ether (η _SP
/ C): A value measured at 25 ° C. for a chloroform solution of 0.5 g / dl solution.

Tensile strength, deflection temperature under load (TDUL):
ASTM No. 4 tensile dumbbell, TDUL test piece (1
27 mm length x 12.7 mm width x 6.4 mm thickness), respectively, ASTM D638, ASTM D648
The tensile strength and TDUL (load 18.6 kg) were measured according to the above.

Mold Shrinkage: Flow direction of injection molded product (M
D) and the dimension in the direction perpendicular to the flow (TD) were measured and determined as a ratio to the original size of the mold. Further, the anisotropy ratio of the molding shrinkage is the ratio of the shrinkage in the TD direction and the shrinkage in the MD direction (TD
/ MD). Flexural modulus: ASTM for test pieces (6.4 mm thick)
It measured according to D790.

The appearance of the injection-molded product was evaluated according to the following criteria. ◯: Appearance is beautiful and no change in color tone is observed. X: A change in color tone is recognized on the surface of the molded product.

The morphology of the composition was observed as follows.
The injection molded product is cut with a microtome and etched with carbon tetrachloride. It was observed using a scanning electron microscope and classified as follows. A: The polyphenylene ether portion (modified PPE and unmodified PPE) is a dispersed phase, and the liquid crystal polyester portion is a continuous phase. B: The polyphenylene ether portion is a continuous phase and the liquid crystal polyester portion is a dispersed phase.

Component (II) Component (1) Modified polyphenylene ether of component (A) (i) 100 parts by weight of polyphenylene ether manufactured by Nippon Polyether Co., Ltd. with η _SP /c=0.46 and 1.5 parts by weight of diallylamine, Trade name Perbutyl PV (manufactured by NOF Corporation) with 0.5 part by weight of styrene as a radical initiator.
After mixing 8 parts by weight with a stabilizer and mixing with a Henschel mixer, granulation was carried out at a cylinder temperature of 280 ° C. using a twin-screw extruder manufactured by Ikegai Tekko KK to obtain a modified polyphenylene ether. Hereinafter, the modified polyphenylene ether is abbreviated as A-1. (Ii) η _SP /c=0.51 Nippon Polyether Co., Ltd.
100 parts by weight of polyphenylene ether, 2.5 parts by weight of stearylamine, 2,5-dimethyl-2,5-di (t
-Butyl-oxy) -hexane diluted with calcium carbonate (trade name: Kayahexa AD40C, Kayaku Nouri Co., Ltd.)
2 parts by weight using a Henschel mixer and then granulated at a cylinder temperature of 280 ° C. using a twin screw extruder manufactured by Ikegai Tekko Co., Ltd. to obtain a modified polyphenylene ether. Hereinafter, the modified polyphenylene ether is abbreviated as A-2.

(2) Liquid crystal polyester of component (B) (i) p-acetoxybenzoic acid 10.8 kg (60 mol), terephthalic acid 2.49 kg (15 mol), isophthalic acid 0.83 kg (5 mol) and 4 5.45 kg (20.2 mol) of 4,4'-diacetoxydiphenyl was charged into a polymerization tank having a comb-type stirring blade, and the temperature was raised with stirring under a nitrogen gas atmosphere to carry out polymerization at 330 ° C. for 1 hour. During this period, the acetic acid produced as a by-product was removed, and the polymerization was carried out under strong stirring. Then, the system was gradually cooled, and the reaction mixture was taken out of the system at 200 ° C. The reaction mixture was crushed with a hammer mill manufactured by Hosokawa Micron Co., Ltd. to obtain particles having a size of 2.5 mm or less. This was further treated in a rotary kiln in a nitrogen gas atmosphere at 280 ° C. for 3 hours to obtain a particulate wholly aromatic polyester composed of the following repeating structural units at a flow temperature of 324 ° C. Hereinafter, the liquid crystal polyester is abbreviated as B-1. This polymer is under pressure
It exhibited optical anisotropy at 0 ° C or higher. Liquid crystal polyester B-
The repeating structural unit of 1 is as follows.

[0061]

[Chemical 14]

(3) Glass Fiber of Component (C) The glass fiber used as the component (C) will be described below together with the fiber diameter and the fiber length. C-1 (abbreviation): Central Glass Co., Ltd., trade name EF
H75-01, number average fiber diameter 13 μm, number average fiber length 5
0 μm, number average aspect ratio 3.8, no surface treatment. C-2 (abbreviation): Central Glass Co., Ltd., trade name EC
S03T461, number average fiber length 3 mm, sizing agent treatment.

Examples 1 and 2 and Comparative Examples 1 to 4 Each component having the composition shown in Table 1 was mixed with a stabilizer and kneaded, and various physical properties were measured. The results obtained are shown in Table 1. The liquid crystal polyester resin composition of the present invention is a resin composition having excellent heat resistance, mechanical properties, various physical properties such as anisotropy ratio of shrinkage, excellent melt processability, a good appearance of molded articles, and an inexpensive resin composition. I understand.

[0064]

[Table 1]

Claims (2)

[Claims] 1. At least one selected from the group consisting of (A) the following monomers (a) to (e) and combinations of monomers.
A modified polyphenylene ether in which one monomer or a combination of monomers is graft-copolymerized, (B) liquid crystal polyester and (C) glass fiber, and has a number average fiber diameter of 5 to 25 μm and a number average fiber length of 30 to 1000 μm and a number average fiber length / number average fiber diameter of 2 to 150, which is a mixture of surface-untreated glass fibers, in which the component (A) is 1 to 75% by weight and the component (B) is 99 to 25. A liquid crystal polyester resin composition, which is 1% by weight to 100% by weight of the total amount of the components (A) and (B), and is 1 to 200 parts by weight. (A) Amino group-containing styrene-based monomer. (B) Amino group-containing monomer. (C) Styrene-based monomer and amino group-containing monomer. (D) Amino group-containing styrene-based monomer and styrene-based monomer. (E) Amino group-containing styrene-based monomer and amino group-containing monomer. (However, the above-mentioned styrene-based monomer and amino group-containing monomer exclude amino group-containing styrene-based monomers.) 2. The liquid crystal polyester resin composition according to claim 1, wherein the component (A) is a dispersed phase and the component (B) is a continuous phase.