JPH05171044A - Resin composition - Google Patents

Abstract

PURPOSE:To obtain a resin compsn. excellent in heat resistance, dynamic properties and moldability by blending a specific arom. polysulfone with a liquid crystal polyester. CONSTITUTION:A resin compsn. comprises 99-60wt.% arom polysulfone having recurring units of the formula and a reduced viscosity mentioned below, and 1-40wt.% liquid crystal polyester. The reduced viscosity of the arom. polysulfone is 0.2 to 0.7dl/g when measured in dimethylformamide at a concn. of 0.1g/dl at 30 deg.C. A pref. method of preparing the arom. polysulfone copolymer to be used is nucleophilic substitution polycondensation wherein monomers having a hydroxyl group and a halogen atom at the terminals are polymerized in a polar solvent in the presence of an alkali metal or a metallic salt, e.g. polymn. in an aprotic polar solvent in the presence of an alkali metal carbonate.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a resin composition containing an aromatic polysulfone and a liquid crystal polyester.

[0002]

2. Description of the Related Art Aromatic polysulfone resins are engineering plastics excellent in heat resistance, strength, rigidity, toughness, flame retardancy, chemical properties, wear resistance, etc., and are expected to be used in a wide range of fields. ing. For example, it has been attracting attention as an engineering plastic having excellent creep resistance at high temperatures in applications such as electric parts and automobile parts. However, since aromatic polysulfone resin has high heat resistance, it has high melt viscosity and poor molding fluidity. Therefore, when molding thin-walled molded products, precision molded products, etc., there occurs molding failure such as delamination or flow marks, which requires a special (high temperature, high pressure) molding machine.
It has the drawback that it is difficult to mold with an ordinary molding machine.

As an attempt to maintain the above-mentioned excellent properties of the aromatic polysulfone resin and improve the moldability, JP-A No. 2-1.
In 40267, there is a method of blending polyarylene polyether sulfone, thermotropic liquid crystal polyester and fibrous inorganic filler.

The liquid crystal polyester is known as a polymer which exhibits crystallinity when melted, and the mechanical properties obtained from its high crystallinity and orientation are superior to those of other polymers. It has excellent electrical characteristics and is expected to be used in many fields. However, liquid crystal polyester has a high melting point but a low glass transition point, and its elastic modulus and strength decrease at the glass transition temperature or higher, and the use of liquid crystal polyester is limited depending on the application. Thus, a resin composition that retains the excellent properties of the aromatic polysulfone resin and has improved moldability is desired.

[0005]

SUMMARY OF THE INVENTION The present invention is to solve the above-mentioned conventional problems, and the object thereof is to
Another object of the present invention is to provide a resin composition having excellent heat resistance, mechanical properties, and moldability, in addition to the excellent properties inherent in an aromatic polysulfone resin.

[0006]

Means for Solving the Problems As a result of intensive studies to solve the above problems, the present inventors have found that by blending a liquid crystal polyester with a specific aromatic polysulfone resin, In addition to various excellent properties,
The inventors have found that a resin composition having improved moldability of an aromatic polysulfone, preventing deterioration of mechanical properties of a liquid crystal polyester at high temperature, and having an excellent balance of total properties can be obtained, and completed the present invention.

The first resin composition of the present invention has the following formula (I)
Aromatic polysulfone 9 having a repeating unit represented by
A resin composition comprising 9 to 60% by weight and a liquid crystal polyester of 1 to 40% by weight, wherein the reduced viscosity of the aromatic polysulfone is 0.1% in dimethylformamide.
g / dl, when measured at a temperature of 30 ° C., 0.2 to 0.7
dl / g.

[0008]

[Chemical 5]

The above-mentioned aromatic polysulfone is an aromatic polysulfone composed solely of the repeating unit represented by the above formula (I), or the repeating units 1 to 99 represented by the formula (I).
It is an aromatic polysulfone composed of mol% and 99 to 1 mol% of at least one repeating unit selected from the group consisting of any one of the repeating units represented by the following formulas (II) to (XVI). When the repeating unit represented by the formula (I) is 1 mol% or less, the heat resistance of the resin composition is poor. The molecular weight of the aromatic polysulfone can be based on the reduced viscosity, and the reduced viscosity is 0.2 to 0.7 dl / g when measured at a concentration of 0.1 g / dl in dimethylformamide at 30 ° C. is necessary. If the reduced viscosity is less than 0.2 dl / g, the mechanical properties of the resulting resin composition will be poor, and if it exceeds 0.7 dl / g, the moldability will be reduced.

[0010]

[Chemical 6]

[0011]

[Chemical 7]

A preferred method for producing the aromatic polysulfone copolymer used in the present invention is a nucleophilic reaction in which a monomer having a hydroxyl group and a halogen group at the end is polymerized in a polar solvent in the presence of an alkali metal or a metal salt. The substitution polycondensation method is used, and examples thereof include a method of polymerizing in an aprotic polar solvent in the presence of an alkali metal carbonate.

The above-mentioned alkali metal carbonate is represented by the above formula (I),
Or a compound capable of forming an alkali metal salt by reacting with a monomer having a hydroxyl group among the monomers for forming the repeating units represented by (I) and (II) to (XVI),
Specific examples include sodium carbonate, potassium carbonate, rubidium carbonate, cesium carbonate and the like. Particularly preferably,
Potassium carbonate or sodium carbonate. Further, potassium bicarbonate or sodium bicarbonate can also be used for producing carbonate by the thermal decomposition reaction represented by the following formula.

[0014]

[Chemical 8]

(In the formula, M is an alkali metal.) The amount of the alkali metal carbonate used is in order to obtain a polymer.
And, in order to increase the polymerization reaction rate, it is preferable to use an excessive molar amount with respect to the total molar amount of the above-mentioned monomer having a hydroxyl group. When the amount of the alkali metal carbonate used is small, it is not preferable because a large amount of free hydroxyl groups are present and only a low molecular weight product is obtained.

Examples of the aprotic polar solvent include N, N-dimethylformamide, N, N-dimethylacetamide, N-methyl-2-pyrrolidone and 1,3-
Examples thereof include amide solvents such as dimethyl-2-imidazolidinone and dimethylimidazoline, and sulfone solvents such as dimethyl sulfoxide, sulfolane and diphenyl sulfone. Azeotropic dehydration solvent, if necessary,
For example, benzene, toluene, xylene, chlorobenzene, monochloroethane, dichloroethane, trichloroethane, tetrachloroethane, monochloroethylene, dichloroethylene, trichloroethylene and the like can be added.

In the production of the copolymer, the polymerization reaction temperature is usually 80 to 400 ° C., preferably 100 to 350 ° C., although it varies depending on the reaction raw materials, the types of components, the type of polymerization reaction and the like. Will be implemented in. When the reaction temperature is lower than the above temperature range, the intended polymerization reaction does not proceed at a rate that can be practically used, and it is difficult to obtain a polymer having a required molecular weight. On the other hand, when the reaction temperature is higher than the above range, side reactions other than the intended polymerization reaction cannot be ignored and coloring of the obtained polymer becomes remarkable.
The time required for the polymerization reaction varies depending on the type of reaction raw material components, the type of polymerization reaction, etc., but is usually in the range of 10 minutes to 100 hours, and preferably in the range of 1 hour to 24 hours.

Further, in the polymerization, the monomers are mixed such that all the halogen groups are 90% of the total hydroxyl groups of the monomers.
It is preferably carried out within a range such that the content becomes ˜110 mol%. 95-105 to obtain higher polymer
It is preferably used within the range of mol%.

In the production of the copolymer, it is preferable that oxygen is not present as the atmosphere in which the reaction is carried out, and if the reaction is carried out in nitrogen or other inert gas, good results can be obtained. This is because the alkali metal salt reacted with the hydroxyl group is easily oxidized when heated in the presence of oxygen, which hinders the intended polymerization reaction and makes it difficult to increase the molecular weight.
This is because it also causes coloring of the produced polymer.

In the production of the copolymer, the reaction mixture may be usually cooled to stop the polymerization reaction. Further, in order to stabilize the phenoxide group which may be present at the terminal of the polymer and terminate the polymerization, addition reaction of an aliphatic halide, an aromatic halide or the like is carried out as necessary. .. Specific examples of the halide include methyl chloride, ethyl chloride, methyl bromide, 4-chlorodiphenyl sulfone, 4-chlorobenzophenone, 4,4'-dichlorophenyl sulfone, 4-chloronitrobenzene and the like. ..

In the production of the copolymer, a known method can be applied as a method for separating and purifying the produced copolymer.
For example, after filtering the salt precipitated in the reaction solvent and the excess alkali metal carbonate, the polymer solution which is the filtrate is usually added dropwise to the non-solvent of the polymer, or conversely, the non-solvent of the polymer is added to the polymer. The target polymer can be precipitated by adding it to the solution. Representative examples of those usually used as a non-solvent of the polymer, methanol, ethanol,
Examples thereof include isopropanol, acetone, methyl ethyl ketone, water and the like, and these may be used alone or as a mixture of two or more kinds.

The liquid crystal polyester contained in the resin composition of the present invention has the following formula:

[0023]

[Chemical 9]

A polyester having a thermotropic liquid crystallinity containing 20 mol% or more of the repeating unit represented by the formula is preferred. This repeating unit can be referred to as a p-oxybenzoyl moiety and is derived from p-hydroxybenzoic acid or a derivative thereof. When the content of the portion in the liquid crystal polyester is 20 mol% or less, the thermotropic crystallinity is lost, which is not preferable.

The skeleton other than the p-oxybenzoyl moiety in the liquid crystal polyester used in the present invention is, for example,

[0026]

[Chemical 10]

An aromatic dicarboxylic acid residue such as

[0028]

[Chemical 11]

A dihydroxy compound residue or the like can be incorporated in such a range that the thermotropic liquid crystallinity is not lost, but it is not limited to these specific skeletons.

The first resin composition of the present invention comprises 99 to 60% by weight of the aromatic polysulfone and 1 to 40% by weight of liquid crystal polyester. When the content of aromatic polysulfone exceeds 99% by weight, the moldability of the resin composition is poor, and when the content of aromatic polysulfone is less than 60% by weight, a continuous phase of liquid crystal polyester is formed in the resin composition. Therefore, the effect of maintaining the heat resistance of the aromatic polysulfone cannot be expected, which is not preferable. When the content of the aromatic polysulfone is 99 to 60% by weight and the content of the liquid crystal polyester is 1 to 40% by weight, the resin composition has excellent heat resistance, mechanical properties and moldability.

The first resin composition of the present invention contains various additives as long as the effects of the present invention are not impaired. For example, antioxidants, heat stabilizers, UV absorbers,
Release agent, colorant, crystal nucleating agent, filler (clay, mica, silica, graphite, glass beads, alumina,
One or more of reinforcing fibers (glass fiber, carbon fiber, potassium titanate fiber, etc.) may be contained.

The means for mixing the components of the first resin composition of the present invention is not particularly limited. It is possible to separately supply aromatic polysulfone and liquid crystal polyester to the melt mixer, and pre-mix these raw materials using a mortar, Henschel mixer, ball mill, ribbon blender, etc., and then melt mixer Can also be supplied to.

The second resin composition of the present invention is a resin composition comprising 99 to 60% by weight of an aromatic polysulfone copolymer and 1 to 40% by weight of a liquid crystal polyester, wherein the above aromatic polysulfone copolymer is used. Is the following general formula (XVI
I), (XVIII) and (XIX) are obtained by polymerizing the monomer, and the structural unit corresponding to the monomer represented by the general formula (XVII) is contained at a ratio of 1 to 49 mol%, and the general formula ( XVIII) and (XIX) containing a structural unit corresponding to the monomer in a total amount of 51 to 99 mol%,
And, the reduced viscosity of the aromatic polysulfone copolymer is
Concentration 0.1g / dl, temperature 3 in dimethylformamide
It is 0.2-0.7 dl / g when measured at 0 degreeC.

[0034]

[Chemical 12]

[0035]

[Chemical 13]

[0036]

[Chemical 14]

(In the above formula, n represents an integer of 3 or 4, and R ¹ and R ² are each independently a hydrogen atom, a halogen atom, or a linear or branched carbon atom having 1 to 8 carbon atoms. Represents a hydrogen group, and a and b are each independently 1 to 4
Is an integer and X and Y represent a halogen atom. ) The aromatic polysulfone copolymer contained in the second resin composition of the present invention has the general formula (XVII), (XVIII) and (XI
It is a copolymer of the monomer represented by X) and is composed of repeating units excluding X, Y, and a hydroxyl group from the general formula, which are linearly linked via an ether bond.

Here, the content of the structural unit corresponding to the monomer (XVII) is 1 to 49 mol%, preferably 5 to
It is 40 mol%. If the content is less than 1%, the heat resistance of the resin composition will be insufficient, and if it exceeds 49%, the composition will be difficult to melt due to heat and kneading, molding, etc. will not be possible, which is not practical. The molecular weight of the aromatic polysulfone can be based on the reduced viscosity, and the reduced viscosity is 0.2 to 0.7 dl / g when measured at a concentration of 0.1 g / dl in dimethylformamide at 30 ° C. Is. If the reduced viscosity is less than 0.2 dl / g, the mechanical properties of the resin composition will be poor, and if it exceeds 0.7 dl / g, the moldability will be reduced.

Examples of the monomer represented by the above general formula (XVII) include dihydroxy compounds such as 4,4 '''-dihydroxy-p-terphenyl and 4,4'''-dihydroxy-p-quaterphenyl. It is preferably used. In addition, 4,4 ′ ″-dihydroxy-p-quaterphenyl is, for example, Journal of Chem.
ical Society 1379-85 (194)
It can be synthesized according to the method described in 0).

As the monomer represented by the general formula (XVIII), a monohalogen monohydroxysulfone compound represented by the following formula is preferably used.

[0041]

[Chemical 15]

X in the monomer represented by the general formula (XIX)
Examples of the halogen atom represented by are fluorine, chlorine and iodine, and fluorine and chlorine are particularly preferable. R ¹ and R ² are each independently a hydrogen atom,
It is a halogen atom or a linear or branched hydrocarbon group having 1 to 8 carbon atoms. Chlorine or bromine is preferable as the halogen atom. Specific examples of the hydrocarbon group include:
Examples thereof include methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, t-butyl, n-amyl, isoamyl, neopentyl, hexyl, heptyl, n-octyl and isooctyl. As a preferable compound, a dihalodiphenyl sulfone compound represented by the following formula can be exemplified.

[0043]

[Chemical 16]

The method for producing the aromatic polysulfone copolymer contained in the second resin composition of the present invention is basically the same as the method for producing the aromatic polysulfone contained in the first resin composition. is there.

The liquid crystal polyester resin contained in the second resin composition of the present invention is the same as the liquid crystal polyester resin contained in the first resin composition.

The second resin composition of the present invention comprises 99-60% by weight of an aromatic polysulfone copolymer and 1-40% by weight of a liquid crystalline polyester. When the content of aromatic polysulfone exceeds 99% by weight, the moldability of the resin composition is poor and the content of aromatic polysulfone is 60% by weight.
When it is less than 1, the continuous phase of the liquid crystal polyester is formed in the resin composition, so that the heat resistance due to the aromatic polysulfone is insufficient. The content of aromatic polysulfone is 99 to 60% by weight, and the content of liquid crystal polyester is 1 to 4
When it is 0% by weight, the resin composition has excellent heat resistance, mechanical properties and moldability.

If necessary, the second resin composition of the present invention contains the same additives as those of the first resin composition.

The means for mixing the components of the second resin composition of the present invention is not particularly limited. For example, the mixing means in the second resin composition is adopted.

[0049]

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

Example 1 [Manufacturing Method of Aromatic Polysulfone] 100 ml equipped with a stirrer, a gas inlet tube, a thermometer and a condenser with a receiver at the tip.
In a eggplant-shaped flask, 10.33 g (30 g of 4-chloro-4 ′-(p-hydroxyphenyl) diphenylsulfone
mmol), anhydrous potassium carbonate 2.28 g (16.5 m)
mol) and 30 ml of sulfolane were charged, and the atmosphere was replaced with nitrogen. Then, stirring and heating are started under a nitrogen atmosphere, and the system temperature is set to 220 ° C. for 1 hour and 230 ° C. for 30 hours.
The reaction was carried out by holding at 240 ° C. for 3 hours. After completion of the reaction, the reaction solution was cooled to room temperature, potassium chloride precipitated in the reaction solution was removed by filtration, and the filtrate was poured into a large amount of methanol to precipitate a polymer powder. The reduced viscosity of the obtained polymer was 0.4 dl / g (30 ° C., 0.1 g / dl in dimethylformamide).

[Preparation of Resin Composition] Aromatic polysulfones and liquid crystal polyesters (Vectra A-950 (trade name) manufactured by Polyplastics Co., Ltd.) polymerized by the above method are shown in Table 1.
After dry-blending with the above composition, the mixture was extruded with a Brabender Plastograph extruder at a processing temperature of 360 ° C. and a screw rotation rate of 25 rpm while being melt-kneaded to obtain uniform melt-blended pellets. Injection molding was performed using the pellets to obtain a test piece for measuring physical properties. Separately, the bar flow length was measured under various conditions using an injection molding machine. The tensile properties and heat distortion temperature of the test piece were measured (each test method will be described later). The results are shown in Table 1. The results of Examples 2 to 4 and Comparative Examples 1 to 6 described later are also shown in Table 1.

(Example 2, Comparative Examples 1 and 2) A resin composition was prepared in the same manner as in Example 1 except that the aromatic polysulfone and the liquid crystal polyester were blended in the composition ratios shown in Table 1. The same test as in Example 1 was performed.

Example 3 [Manufacturing Method of Aromatic Polysulfone] 100 ml equipped with a stirrer, a gas introduction pipe, a thermometer and a condenser with a receiver at the tip.
In the eggplant-shaped flask, 5.17 g (15 m) of 4-chloro-4 ′-(p-hydroxyphenyl) diphenylsulfone
mol), 4-chloro-4′-hydroxyphenyl sulfone 4.03 g (15 mmol), anhydrous potassium carbonate 2.28 g (16.5 mmol), and sulfolane 3
0 ml was charged and the atmosphere was replaced with nitrogen. Next, stirring and temperature increase were started under a nitrogen atmosphere, and the system temperature was maintained at 220 ° C. for 1 hour, 230 ° C. for 30 minutes, and 240 ° C. for 3 hours to carry out the reaction. After the reaction was completed, the reaction solution was cooled to room temperature, potassium chloride precipitated in the reaction solution was removed by filtration,
The filtrate was poured into a large amount of methanol to precipitate a polymer powder. The reduced viscosity of the obtained polymer is 0.42 dl /
g (30 ° C., 0.1 g / dl in dimethylformamide)
Met.

[Preparation of Resin Composition] Example 1 except that the resin polymerized by the above-mentioned method was used as the aromatic polysulfone and the composition was blended with the liquid crystal polyester in the composition ratio shown in Table 1.
A resin composition was prepared in the same manner as above, and the same test as in Example 1 was conducted.

(Example 4, Comparative Examples 3 and 4) A resin composition was prepared in the same manner as in Example 3 except that the aromatic polysulfone and the liquid crystal polyester were blended in the composition ratios shown in Table 1. The same test as in Example 1 was performed.

Comparative Example 5 As shown in Table 1, a resin composition was prepared in the same manner as in Example 1 except that the liquid crystal polyester was not used, and the same test as in Example 1 was conducted. ..

(Comparative Example 6) I as an aromatic polysulfone
A resin composition was prepared in the same manner as in Example 1 except that Victrex PES3600P manufactured by CI Co. was blended with the liquid crystal polyester in the composition ratio shown in Table 1, and the same test as in Example 1 was performed.

[0058]

[Table 1]

Note) 1) A: Repeating unit

[0060]

[Chemical 17]

Molar fraction of 2) B: Repeating unit

[0062]

[Chemical 18]

Molar fraction of 3) C: Weight fraction of liquid crystal polyester (Vectra A-950) 4) D: Weight fraction of aromatic polysulfone 5) Test according to ASTM D648 under a load of 18.6 kg. It was

6) Injection molding machine (Toshiba Machine, IE-10
0), the injection pressure was 1200 kg / cm ² , the resin temperature was 360 ° C., the injection speed high speed index was 8.5, and the mold temperature was 120 ° C., and the shape of the bar flow mold was 3 mm thick × 8 mm wide.

7) Measured according to ASTM D638.

Example 5 [Production Method of Aromatic Polysulfone] 200 ml equipped with a stirrer, a gas introduction pipe, a thermometer and a condenser with a receiver at the tip
In a eggplant-shaped flask, 10.33 g (30 g of 4-chloro-4 ′-(p-hydroxyphenyl) diphenylsulfone
mmol), 4,4 '''-dihydroxy-p-quarterphenyl 3.39 g (10 mmol), 4,4'-
2.88 g of dichlorodiphenyl sulfone (10 mmo
l), 3.41 g (25 mmol) of anhydrous potassium carbonate,
60 g of diphenyl sulfone and 25 ml of toluene were charged and the atmosphere was replaced with nitrogen. Next, stirring and temperature increase were started in a nitrogen atmosphere, and azeotropic distillation of toluene was performed at 150 to 170 ° C. to remove water in the system. After about 1 hour, after confirming that the distillation stopped, the reaction was carried out at 220 ° C. for 1 hour, 250 ° C. for 30 minutes, 280 ° C. for 30 minutes, and 320 ° C. for 3 hours. After completion of the reaction, the reaction solution was cooled to room temperature, potassium chloride precipitated in the reaction solution was removed by filtration, and the filtrate was poured into a large amount of methanol to precipitate a polymer. The reduced viscosity of the obtained polymer was 0.40 dl / g (30 ° C,
It was 0.1 g / dl in dimethylformamide).

[Preparation of Resin Composition] A resin composition was prepared in the same manner as in Example 1 except that the aromatic polysulfone polymerized by the above method and the liquid crystal polyester were blended in the proportions shown in Table 2, The test was conducted in the same manner as in Example 1. The results are shown in Table 2. Examples 6 to 8 and Comparative Example 7 to be described later
The results of 10 are also shown in Table 2.

(Example 6, Comparative Examples 7 and 8) A resin composition was prepared in the same manner as in Example 5 except that the aromatic polysulfone and the liquid crystal polyester were blended in the composition ratios shown in Table 2. The procedure was as in Example 1.

(Examples 7 and 8, Comparative Examples 9 and 1)
0) 4-chloro-4 ′-(p-hydroxyphenyl) diphenyl sulfone, 4,4 ′ ″-dihydroxy-p-
A resin composition was prepared in the same manner as in Example 5 except that the amounts of quarter phenyl and 4,4'-dichlorodiphenyl sulfone were changed to the composition ratios shown in Table 2 and the liquid crystal polyester and the proportions shown in Table 2 were added. The same test as in Example 1 was performed.

[0070]

[Table 2]

Note) 1) A:

[0072]

[Chemical 19]

Molar fraction of 2) B:

[0074]

[Chemical 20]

Molar fraction of 3) C:

[0076]

[Chemical 21]

Molar fraction of 4) D: Weight fraction of liquid crystalline polyester (Vectra A-950) 5) E: Weight fraction of aromatic polysulfone 6) Test according to ASTM D648 under a load of 18.6 kg. It was

7) Injection molding machine (Toshiba Machine, IE-10
0), the injection pressure was 1200 kg / cm ² , the resin temperature was 360 ° C., the injection speed high speed index was 8.5, and the mold temperature was 120 ° C., and the shape of the bar flow mold was 3 mm thick × 8 mm wide.

8) Measured according to ASTM D638.

[0080]

According to the present invention, by blending a liquid crystal polyester with a specific aromatic polysulfone, the aromatic polysulfone resin and the liquid crystal polyester resin have excellent properties, heat resistance and mechanical properties. And a resin composition having excellent moldability can be obtained.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Hiroki Kakumachi, 1-11-3 Minamikasugaoka, Ibaraki-shi, Osaka (72) Inventor Daishiro Kishimoto 2--11-20, Mishimaoka, Ibaraki, Osaka

Claims (2)

[Claims] 1. A resin composition comprising 99 to 60% by weight of an aromatic polysulfone having a repeating unit represented by the following formula (I) and 1 to 40% by weight of a liquid crystal polyester, wherein the reduced viscosity of the aromatic polysulfone is: Is 0.2 to 0.7 dl / g when measured at a concentration of 0.1 g / dl and a temperature of 30 ° C. in dimethylformamide. [Chemical 1] 2. Aromatic polysulfone copolymer 99-60
A resin composition comprising 1% to 40% by weight of liquid crystal polyester and 1 to 40% by weight of a liquid crystal polyester, wherein the aromatic polysulfone copolymer is obtained by polymerizing monomers represented by the following general formulas (XVII), (XVIII) and (XIX). 1 to 49 mol% of the constitutional unit corresponding to the monomer represented by the general formula (XVII)
And the structural units corresponding to the monomers represented by the general formulas (XVIII) and (XIX) are contained in a total amount of 51 to 99 mol%, and the reduced viscosity of the aromatic polysulfone copolymer is When measured at a concentration of 0.1 g / dl in dimethylformamide and a temperature of 30 ° C., 0.2 to
Resin composition characterized by being 0.7 dl / g. [Chemical 2] [Chemical 3] [Chemical 4] (However, in the above formula, n represents an integer of 3 or 4, and R ¹
And R ² each independently represent a hydrogen atom, a halogen atom or a linear or branched hydrocarbon group having 1 to 8 carbon atoms, a and b each independently represent an integer of 1 to 4, X , Y represents a halogen atom. )