JPH0459870A - Polyphenylene sulfide resin composition - Google Patents

Abstract

PURPOSE:To provide the title composition excellent in resistance to heat, solvents and impact, etc., suitable for the industrial material field such as for automobiles, comprising a polyphenylene sulfide resin having each specific number-average and weight-average molecular weight etc., and a polyphenylene ether at each specified amount. CONSTITUTION:The objective composition can be obtained by incorporating a total of 100 pts.wt. of (A) 90-10wt.% of a polyphenylene sulfide resin, >=0.9X10<4> in number-average molecular weight (Mn) and >=5.5X10<4> in weight- average molecular weight (Mw), having such a molecular weight distribution as to satisfy Mw/Mn <10, and <=200g/10min in melt flow rate value (MF5) and having the retention rate of the melt flow rate satisfying the relationship (MF5 and MF15 are melt flow rate values at residence times for 5min and 15min, respectively) and (B) 90-10wt.% of a polyphenylene ether [e.g. poly(2,6- dimethyl-1,4-phenylene ether)] with (C) 1-50 pts.wt. of a thermoplastic elastomer.

Description

Detailed Description of the Invention <Industrial Application Field> The present invention relates to a polyphenylene sulfide resin composition having excellent heat resistance, solvent resistance, mechanical strength, and impact resistance represented by notched isot impact strength. It is something.

<Conventional technology> Polyphenylene sulfide resin (hereinafter abbreviated as PPS)
In a reinforced system reinforced with glass fiber or the like, it has properties suitable as a crystalline engineering plastic, such as excellent heat resistance, impact resistance, and rigidity, and is used for various purposes, mainly injection molding. However, unreinforced PPS that is not reinforced with glass fiber or the like lacks toughness and is therefore extremely brittle. Furthermore, the glass transition temperature is 90°C
Because of its low heat resistance, it is currently difficult to use it for various molding applications.

In recent years, it has been found through various polymer combinations that it is an effective method to improve the lack of heat resistance of crystalline thermoplastic resins by combining them with non-grade thermoplastic resins that have a high glass transition temperature to form polymer alloys. There is. Polyphenylene ether is one of the non-grade thermoplastic resins suitable for such purposes. Polyphenylene ether (hereinafter referred to as P
Many proposals have already been made regarding the modification of PPS with PE (abbreviated as PE).

For example, Japanese Patent Publication No. 56-34032 proposes a resin composition composed of PPS and PPE that has excellent moldability and flame retardancy. Furthermore, Japanese Patent Application Laid-open No. 157859/1985 describes a PPE grafted with PPS and styrene polymer.
A resin composition with improved compatibility consisting of
No. 164360 discloses a resin composition with improved compatibility consisting of PPS, PPE, and epoxy resin, and JP-A-59-213758 discloses a resin composition with improved compatibility consisting of PPS, PPE, polyamide resin, and epoxy resin. JP-A-63-205358 proposes a resin composition with improved compatibility consisting of PPS, PPE, and a maleimide compound.

In addition, JP-A No. 64-31862 discloses a method comprising modified PPE and PPS modified with a modifying agent having an ethylenic double bond and a carboxyl group or an acid anhydride group, and an organic compound having at least two or more epoxy groups. Japanese Patent Laid-Open No. 1-259060 discloses a resin composition with improved compatibility and excellent heat resistance and solvent resistance. A resin composition with improved compatibility, excellent mechanical performance, heat resistance, and solvent resistance, consisting of modified PPE modified with a modifier having a group and modified PPS modified with the modifier,
JP-A-1-266160 discloses modified PP modified with a modifier having an ethylenic double bond and a functional group selected from a carboxyl group, an acid anhydride group, a hydroxyl group, and an epoxy group.
E and a modified PPS modified with the modifier, and a binder having at least two or more functional groups selected from a carboxyl group, an acid anhydride group, a hydroxyl group, an amino group, an epoxy group, a mercapto group, an oxazoline group, and an isocyanate group in the molecule. A resin composition with improved compatibility, mechanical performance, and excellent solvent resistance has been proposed.

Furthermore, in Japanese Patent Application Laid-open No. 1-213359, PPS
A resin composition comprising PPE and a glycidyl group-containing thermoplastic polymer with improved compatibility and excellent heat resistance, flame retardance, solvent resistance, moldability, mechanical strength, and impact resistance has been disclosed in JP-A-1999-1. -213360 publication describes acid-modified PPS and α, β
- A resin composition made of modified PPE modified with unsaturated carboxylic acids and having improved compatibility and excellent heat resistance, flame retardance, solvent resistance, moldability, mechanical strength, and impact resistance is disclosed in JP-A-1 -213361 publication describes PPS, PPE, and glycidyl group-containing styrene resin with improved compatibility, heat resistance, flame retardance, solvent resistance, moldability, mechanical strength,
Resin compositions with excellent impact resistance have been proposed.

<Problem to be solved by the invention> However, among these proposals, the
The composition consisting of PPS and PPE described in Publication No. 32 is P
Although it does provide a resin composition with superior processability compared to the case of using PE alone, the impact resistance is extremely poor because PPS of relatively low molecular weight is used. Furthermore, the compatibility is insufficient and delamination is significant.

A resin composition comprising PPE grafted with PPS and a styrene polymer described in JP-A-58-157859;
PPS and PPE described in JP-A-59-164360
Resin composition comprising epoxy resin and epoxy resin, JP-A-59-
Resin composition comprising PPS, PPE, polyamide resin, and epoxy resin described in JP-A No. 213758, JP-A-6
The resin composition made of PPS, PPE, and a maleimide compound described in Publication No. 3-205358 uses PPE grafted with a styrene polymer, an epoxy resin, an amide resin and an epoxy resin, and a maleimide compound. By using PPS
The purpose is to provide a resin composition with improved compatibility between PPE and PPE.
It is certainly effective in preventing delamination compared to the composition of PPS and PPE described in Publication No. 2. However, there are no particular regulations regarding the degree of polymerization and molecular weight distribution of PPS used in these resin compositions, and ordinary PPS
No improvement has been observed in the impact resistance of the resulting resin composition, particularly in the notched Izot impact value. Furthermore, resin compositions comprising modified PPE, PPS and epoxy compounds described in JP-A-64-31862, resin compositions comprising modified PPS and modified PPE described in JP-A-1-259060, and JP-A-1-2
The resin composition described in 66160, which is composed of modified PPS, modified PPE, and a compound having two or more functional groups, can be prepared by modifying PPS and/or PPE, and by adding a compound having a functional group. The purpose is to improve compatibility and provide a resin composition with improved mechanical strength and solvent resistance, and although it is effective in preventing delamination, there is no mention of impact resistance. Furthermore, there are no regulations regarding the degree of polymerization or molecular weight distribution of the PPS used in these resin compositions, and only ordinary PPS is used. No improvement can be expected.

Furthermore, resin compositions made of PPS, PPE, and glycidyl group-containing polymers described in JP-A-1-213359, resin compositions made of modified PPS and modified PPE described in JP-A-1-213360, and JP-A-1-213360, 213
Regarding the resin composition made of PPS, PPE, and glycidyl group-containing styrene resin described in Publication No. 361, although there is a description of the viscosity of the PPS used, there are no regulations regarding the molecular weight distribution and the retention rate of the melt flow rate value. Because ordinary PPS is used, the notched Izot impact value of the resulting resin composition is still insufficient, and the balance with heat resistance is also poor.

For this reason, at present, a resin composition with sufficient performance as a molding material, particularly excellent heat resistance and notched impact value, has not been obtained.

Therefore, the present inventors have conducted intensive studies to obtain a resin material with excellent practical properties such as heat resistance, solvent resistance, mechanical strength, and impact resistance, especially notched isot impact strength and heat resistance, by combining PPS and PPH. As a result, a resin composition consisting of specific PPS and PPE with optimized number average molecular weight, weight average molecular weight, molecular weight distribution, melt flow rate value, and melt flow rate value retention, and a thermoplastic elastomer added to the composition were developed. The present invention was achieved by discovering that the resin composition obtained by adding the above-mentioned additives achieves the above objectives and provides a PPS resin composition that can be used for molding purposes.

<Means for Solving the Problems> That is, the present invention provides (1) (A) a number average molecular weight (
Mn) is 0.9 x 104 or more, and has a weight average molecular weight (Mw) of 5.5 x 104 or more,
Moreover, the ratio of number average molecular weight to weight average molecular weight is as follows (I1
It has a molecular weight distribution that satisfies the formula, and further AsTM D1
The melt flow rate value (MF5) specified in 238-86 (315.5°C 15°000g load) is 200.
g/10min or less, and the retention rate of the melt flow rate value is as follows (90 to 10% by weight of polyphenylene sulfide resin that satisfies formula m and Mw/Mn < 10 (I)
50<MF 5/MF15X100<120 (I
I) (Here, MF5 and MFss represent melt flow rate values at residence times of 5 minutes and 15 minutes, respectively.) (B) A polyphenylene sulfide resin composition composed of 90 to 10% by weight of polyphenylene ether, and (2) (A) Number average molecular weight determined by gel permeation chromatography using 1-chloronaphthalene as a solvent (
Mn) is 0.9 x 104 or more, and the weight average molecular weight (Mw) is 5.5 x 104 or more, and the ratio of number average molecular weight to weight average molecular weight is as follows (
I) has a molecular weight distribution that satisfies the formula, and also has an ASTM D1
238-86 (315.5℃ 15.000g load) Melt flow rate value (MFs) is 200
g/10min or less, and the retention rate of the melt flow rate value is as follows (90 to 10% by weight of polyphenylene sulfide resin that satisfies formula m and Mw/Mn < 10 (1)
50<MF5/MF□5×10・O<120 (
II) (Here, MF5 and MFl represent melt flow rate values at residence times of 5 minutes and 15 minutes, respectively.) (B) For 100 parts by weight of a resin composition composed of 10 to 90% by weight of polyphenylene ether. (C) A polyphenylene sulfide resin composition containing 1 to 50 parts by weight of a thermoplastic elastomer is provided.

PPS (A) used in the present invention has a number average molecular weight (Mn) of 0.9 x 104 determined by gel permeation chromatography using 1-chloronaphthalene as a solvent.
or more, and the weight average molecular weight (M w ) is 5.5
×104 or more, has a molecular weight distribution in which the ratio of number average molecular weight to weight average molecular weight satisfies the following formula (I>), and furthermore has ASTM D1238-86 (3
The melt flow rate value (MF5) determined at 15.5°C, 5.000 g load) is 200 g/10 river inches or less, and the retention rate of the melt flow rate value satisfies the following formula (I[). This is extremely important for achieving the purpose of the present invention.

Mw/Mn<10 (I)50
<MF5/MF Yu5X100<120 (II) (
Here, MF5 and MF1 represent melt flow rate values at residence times of 5 minutes and 15 minutes, respectively. ) PP consisting of PPS and PPE that do not satisfy these conditions
Although improvements in heat resistance, solvent resistance, and mechanical strength are observed in the S resin composition, there is hardly any improvement in impact resistance, particularly notched Izot impact value.

An example of P P S (A) that satisfies the above conditions is M2O88 manufactured and sold by Toshi Phillips Petroleum Company.

The specific P P S (A) used in the present invention has an ethylenic double bond, a carboxyl group, an acid anhydride group, an epoxy group, a hydroxyl group, an amino group, a mercapto group, an oxazoline group, an isocyanate group, etc. in the molecule. It is also possible to use an organic compound that simultaneously has a functional group and/or an organic compound that has two or more of the functional groups in its molecule, modified in the presence or absence of a radical initiator.

Next, PP used as component (B) in the present invention
E is a bonding unit 4 R1 3R2 (where R1, R2, R3 and R4 are each selected from the group consisting of hydrogen, halogen, hydrocarbon or substituted hydrocarbon group, and may be the same or different from each other) The reduced viscosity (0.5 g ldi, chloroform solution, measured at 30°C) is 0.15 to 0.70.
Homopolymers and/or copolymers having a molecular weight in the range of 0.20 to 0.60 are used, more preferably in the range of 0.20 to 0.60. A specific example is poly(2,6-cymethyl-1,4-)
unicine ether), poly(2-methyl-6-nityl-1,4-)unicine ether), poly(2,6-diphenyl-1,4-)unicine ether), poly(2-methyl-6- Phenylene-1゜4-)unisine ether),
poly(2,6-dichloro-1,4-)unicine ether) and the like. Further examples include polyphenylene ether copolymers such as copolymers of 2,6-dimethylphenol and other phenols (for example, 2,3,6-trimethylphenol). Especially poly(2)
, 6-dimethyl-1,4-phenylene ether), 2.
A copolymer of 6-dimethylphenol and 2°3,6-trimethylphenol is preferred, and poly(2,6-dimethyl-1,4-phenylene ether) is particularly preferred.

The method for producing such PPH is not particularly limited, and those obtained by known methods can be used. For example, it can be easily produced by oxidative polymerization of, for example, 2,6-xylenol using a cuprous salt and amino humplex by Hay described in U.S. Pat. No. 3,306,874 as a catalyst.

The PPE used as component (B) contains an ethylenic double bond and functional groups such as a carboxyl group, an acid anhydride group, an epoxy group, a hydroxyl group, an amino group, a mercapto group, an oxazoline group, and an isocyanate group in the molecule. It is also possible to use an organic compound having at the same time and/or an organic compound having two or more of the functional groups in the molecule, modified in the presence or absence of a radical initiator.

The PPS resin composition of the present invention has a specific PPS (A)
and P P E (B), but the mixing ratio of these is such that p p S (A) is 90
~10% by weight, preferably 80-20% by weight, P P
E (B) is 10 to 90% by weight, preferably 20 to 80% by weight
% by weight.

If the amount of P P S (A) is less than 10% by weight, a composition with extremely poor solvent resistance will be obtained, and if it exceeds 90% by weight, the heat resistance will decrease, which is not preferable.

In addition, the PPS resin composition of the present invention has the above-mentioned (A) and (B).
Although the polymer alloy is composed of a combination of components (C), a thermoplastic elastomer can be added as component (C) in the present invention in order to further improve the impact resistance of the resulting resin composition.

The thermoplastic elastomer used as component (C) of the present invention is, for example, a polyolefin elastomer,
Known materials such as polystyrene elastomers, polyamide elastomers, polyester elastomers, polyurethane elastomers, and fluorine elastomers can be used, among which polyolefin elastomers and polystyrene elastomers are preferably selected.

Examples of the polyolefin elastomer include ethylene-(meth)acrylic acid copolymer, ethylene-propylene-diene copolymer, ethylene-propylene copolymer, ethylene-butene copolymer, ethylene-propylene copolymer, and ethylene-propylene copolymer. Examples include butene copolymers modified with maleic anhydride.

Examples of the polystyrene elastomer include, for example, a block copolymer of a vinyl aromatic compound and a conjugated diene compound, or a hydrogenation agent for this block copolymer (hereinafter abbreviated as hydrogenated block copolymer), and further, These block copolymers, hydrogenated block copolymers and α, β-
Examples include modified products (modified polystyrene elastomers) resulting from the reaction of unsaturated carboxylic acids or derivatives thereof. Examples of these polystyrene elastomers include styrene-butadiene-based styrene block copolymers,
Examples include styrene-isoprene-styrene block copolymers and hydrogenated products of these block copolymers (hydrogenated block copolymers), as well as maleic anhydride-modified products of these block copolymers and hydrogenated block copolymers. can be mentioned.

Specific examples of these polystyrene-based elastomers include the 1' CALIFLEX TR'' and ``KRATON G'' series manufactured and sold by Shell Chemical Company.

Furthermore, these block copolymers, hydrogenated block copolymers and α,β-unsaturated carboxylic acids or derivatives thereof are heated at 80 to 350°C in a melted state in the presence or absence of a radical generator. It is also possible to denature by reacting at a temperature of .

Examples of α,β-unsaturated carboxylic acids or derivatives thereof used in this modification include maleic acid, maleic anhydride, fumaric acid, itaconic acid, acrylic acid, acrylic esters, crotonic acid, and maleimide compounds. Among them, maleic anhydride is preferably used.

The α,β-unsaturated carboxylic acid or its derivative is in the range of 0.01 to 20 parts by weight, preferably 0.1 to 1 part by weight, based on 100 parts by weight of the block copolymer or hydrogenated block copolymer.
It is used in a range of 0 parts by weight.

The method for producing the modified polystyrene elastomer can be carried out in any of the known melt mixing state or solution mixing state, and is not limited thereto. Furthermore, these exemplified thermoplastic elastomers may be used alone or in combination of two or more.

Thermoplastic elastomer (C) used in the present invention
is 1 to 50 parts by weight, preferably 3 to 40 parts by weight, per 100 parts by weight of the resin composition composed of the specific PPS (A) and PPE (B). If the thermoplastic elastomer (C) exceeds 50 parts by weight, the heat resistance of the resulting resin composition will decrease, which is not preferable.

In this way, the PPS resin composition of the present invention has (A) and (B)
and (C), and if necessary, glass fibers, alumina fibers, silicon carbide fibers, ceramic fibers, and asbestos may be added to an extent that does not impair the properties of the PPS resin composition of the present invention. fiber, gypsum fiber,
Fibrous reinforcing agents such as metal fibers and carbon fibers, silicates such as wollastenite, sericite, kaolin, mica, clay, bentonite, asbestos, talc, alumina silicate, alumina, silicon chloride, magnesium oxide,
Metal compounds such as zirconium oxide and titanium oxide, carbonates such as calcium carbonate, magnesium carbonate, and dolomite, sulfates such as calcium sulfate and barium sulfate, non-fibrous reinforcing agents such as glass peas, boron nitride, silicon carbide, and silica; Various flame retardants, crystallization accelerators (nucleating agents), silane coupling agents such as mercaptosilane, vinylsilane, aminosilane, and epoxysilane, antioxidants,
Heat stabilizers, ultraviolet absorbers, colorants, etc. can also be added.

There are no particular restrictions on the means for adjusting the PPS resin composition of the present invention.
For example, a heating melt kneading method using a single screw extruder, twin screw extruder, kneader, Brabender, etc. is used. Among these, a melt-kneading method using a single-screw or twin-screw extruder is preferred. The melt-kneading temperature is preferably 280° C. or higher in order to sufficiently melt the PPS, and 340° C. or lower in order to prevent thermal decomposition.

The PPS resin composition of the present invention obtained in this way is
Various conventionally known processing methods such as injection molding, extrusion molding, and foam molding are possible. In addition, it can be widely used as a molding material with excellent heat resistance, impact resistance, flame retardancy, and moldability in industrial materials fields such as automobiles, electrical/electronic, and machinery.

<Example> Hereinafter, the present invention will be further explained in detail using Examples.

Unless otherwise specified, percentages, parts and ratios used in the examples represent percentages by weight, parts by weight and ratios by weight, respectively.

In addition, the Izot impact strength, tensile strength, heat distortion temperature, melt flow rate, molecular weight and molecular weight distribution, and solvent resistance in this example were each measured by the following measuring methods.

Izotsu impact strength: ASTM D256 tensile
Strength: ASTM D638 Heat distortion temperature: AST
MD648 Melt flow rate: ASTM D1238-86 (
Measurement of molecular weight and molecular weight distribution: using a gel permeation chromatography device manufactured by Waters, as disclosed in Kobunshi Ronshu Vol. 44 (1987) February issue 1, pages 39-141 It was carried out according to the method.

Solvent resistance test: After immersing an ASTM No. 1 dumbbell test piece in heptane at 25° C. for 60 minutes, the presence or absence of cracks was observed.

Reference Example 1 PPS bulk powder is shown below. In addition, these characteristic values are
Shown in the table.

pps-i: M2O88 manufactured by Toshi Phillips Petroleum Company PPS-2: R-01 manufactured by Phillips Petroleum Company
C PPS-3: Phillips Petroleum Company No. 1
Table Reference Example 2 Preparation of PPE After sufficiently replacing the inside of a stainless steel reactor with an oxygen inlet at the bottom of the reactor, a cooling coil, and a stirring blade inside with nitrogen, cupric bromide 53. 6g, di-n-butylamine 1.110g.

Toluene 18! , n-butanol 152, methanol 4
8.75 kg of 2,6-xylenol was dissolved in a mixed solvent of Il and charged into a reactor. Polymerization was carried out for 210 minutes by continuously blowing oxygen into the reactor while stirring. Internal temperature 30
Water was circulated through the cooling coil during the polymerization to maintain the temperature at °C.

After the polymerization is completed, the precipitated polymer is separated by filtration, a methanol/hydrochloric acid mixture is added to decompose the residual catalyst in the polymer, and the polymer is sufficiently washed with methanol and dried to form a pale yellowish white powder of PPE (reduced viscosity). 0.59) was obtained.

Reference Example 3 The thermoplastic elastomer used in this example and comparative example is shown below.

C-1=styrene-butadiene-styrene copolymer (
Shell Chemical ■) 1'Califlex TRKX65S”
) C-2 = Styrene-ethylene/butylene-styrene copolymer ("Krayton G1650" manufactured by Shell Chemical rm>) C-3: Acid-modified styrene-ethylene/butylene-styrene copolymer (manufactured by Shell Chemical ■) 1' Kraton FG1901 Tri-blend the composition and use a co-rotating twin-screw extruder set at 290 to 310°C, with a screw rotation speed of 10.
The mixture was melt-kneaded and pelletized under the conditions of ORPM. Using this pellet, injection molding was performed using an in-line screw molding machine to form a test piece (temperature condition setting 290-31
0°C, mold temperature 140-150°C). Table 2 shows the Izot impact strength, tensile strength, heat distortion temperature, and solvent resistance test results of the obtained test pieces.

Comparative Examples 1 to 4 Example 1 except that PPS-2, PP5-3 and the PPE prepared in Reference Example 2 were tri-blended with the composition shown in Table 2.
Kneading, molding and measurement were carried out in exactly the same manner as above. The results are shown in Table 2.

In Comparative Example 1, both the number average molecular weight and weight average molecular weight of the PPS used were low, and the melt flow rate value was also 500 g/10 min, which was outside the range of the present invention, so the value of the notched Izo impact strength was low. low.

In Comparative Example 2, the number average molecular weight, molecular weight distribution, and melt flow rate retention of the PPS used are outside the range of the present invention, so the value of the notched Izo impact strength is also low. In Comparative Example 3, the PPS exceeds 90% by weight, so the heat distortion temperature is low, and in Comparative Example 5, the PPS exceeds 1.
Since the content is less than 0% by weight, cracks are observed in the solvent resistance test.

Examples 4 to 7 All of Example 1 except that the PPE and thermoplastic elastomer prepared in PPS-1 and Reference Example 2 were tri-blended with the composition shown in Table 2 (intercrossing, molding, and measurement were performed in the same manner as in Example 1). , the results are shown in Table 2.

As is clear from Table 2, the composition of the present invention (Example 1
-7) are excellent in Izot impact strength, especially notched Izot impact strength, and also have excellent tensile strength, heat distortion temperature,
The three solvent resistance properties are also excellent in balance.

Comparative Example 5.6 Kneading, molding and measurement were carried out in the same manner as in Example 1, except that PPS-1, PP5-2 and the PPE and thermoplastic elastomer prepared in Reference Example 2 were tri-blended with the composition shown in Table 2. went. The results are shown in Table 2.

In Comparative Example 5, the number average molecular weight, weight average molecular weight, and melt flow rate value of the PPS used are outside the range of the present invention, so even when a thermoplastic elastomer is added, the notched Izo impact value is low. In Comparative Example 6, the thermoplastic elastomer was present in an amount of 50 parts by weight or more based on 100 parts by weight of the resin composition composed of specific PPS and PPE, and therefore the heat resistance was low.

<Effects of the Invention> The PPS resin composition of the present invention is excellent in heat resistance and impact resistance, particularly notched Izot impact strength, and is also excellent in mechanical strength and solvent resistance in a balanced manner.

Patent application Daitoshi Co., Ltd.

Claims (2)

[Claims] (1) (A) Number average molecular weight determined by gel permeation chromatography using 1-chloronaphthalene as a solvent (@M
n@) is 0.9 x 10^4 or more, and the weight average molecular weight (@Mw@) is 5.5 x 10^4 or more, and the ratio of the number average molecular weight to the weight average molecular weight has a molecular weight distribution that satisfies the following formula (I), and furthermore, AST
The melt flow rate value (MF_5) specified in MD1238-86 (315.5℃, 5,000g load) is 2.
00g/10min or less, and 90 to 10% by weight of polyphenylene sulfide resin whose melt flow rate retention rate satisfies the following formula (II) and @Mw@/@Mn@<10 (I) 50<MF_5/MF_1_5× 100<120(II)
(Here, MF_5 and MF_1_5 represent melt flow rate values at residence times of 5 minutes and 15 minutes, respectively.) (B) A polyphenylene sulfide resin composition composed of 90 to 10% by weight of polyphenylene ether. (2) (A) Number average molecular weight determined by gel permeation chromatography using 1-chloronaphthalene as a solvent (@M
n@) is 0.9 x 10^4 or more, and the weight average molecular weight (@Mw@) is 5.5 x 10^4 or more, and the ratio of the number average molecular weight to the weight average molecular weight has a molecular weight distribution that satisfies the following formula (I), and furthermore, AST
The melt flow rate value (MF_5) specified in MD1238-86 (315.5℃, 5,000g load) is 2.
00g/10min or less, and 90 to 10% by weight of a polyphenylene sulfide resin whose melt flow rate retention rate satisfies the following formula (II) and @Mw@/@Mn@<1
0(I) 50<MF_5/MF_1_5×100<120(II)
(Here, MF_5 and MF_1_5 represent the melt flow rate values at residence times of 5 minutes and 15 minutes, respectively.) (B) (C ) A polyphenylene sulfide resin composition containing 1 to 50 parts by weight of a thermoplastic elastomer.