JPH09316329A - Polyarylene sulfide resin composition for injection molding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a polyarylene sulfide resin composition for injection molding which gives a molding having a weld improved in mechanical strengths such as toughness, by contacting a polyarylene sulfide with a coupling agent in the presence of a given amount of water. SOLUTION: The composition is obtained by contacting 100 pts.wt. polyarylene sulfide (A) with 0.05-10 pts.wt. coupling agent (B) in the presence of at least 35, preferably 100-1,200, pts.wt. water. The agent (B) is preferably an epoxysilane coupling agent.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyarylene sulfide resin composition for injection molding, and an injection molded article having a weld portion made of the same.

[0002]

2. Description of the Related Art In recent years, a thermoplastic resin having high heat resistance and chemical resistance has been required as a material for electric / electronic equipment parts, automobile equipment parts, chemical equipment parts and the like. . Polyarylene sulfides (hereinafter sometimes abbreviated as PAS) represented by polyphenylene sulfides (hereinafter sometimes abbreviated as PPS) have recently attracted attention as one of the resins that meet this demand.

However, when the resin is molded, the mechanical strength such as the toughness of the welded portion, that is, the welded portion where the flow front interfaces of two or more resin streams meet and fuse in the mold cavity is extremely low. It has the drawback that Therefore, there is a problem that the weld portion is broken when it is subjected to thermal stress or mechanical stress.

Therefore, some methods have been proposed so far in order to improve the mechanical strength such as the toughness of the welded portion.

Japanese Patent Publication No. 6-39113 discloses PA
A resin composition containing S, a silane compound such as epoxyalkoxysilane, and an inorganic filler is disclosed. Japanese Patent Publication No. 6-51311 discloses a resin composition containing PAS, aminoalkoxysilane and an inorganic filler. Further, JP-A-1-193360 and JP-A-3-43452 disclose resin compositions containing PAS, ureidosilane and an inorganic filler.
However, in both cases, the reactivity between PAS and the silane compound is not sufficient, and it cannot be said that the mechanical strength such as the toughness of the weld portion is sufficiently improved.

Japanese Unexamined Patent Publication No. 6-172531 discloses a PA
A method for producing an adhesive PAS, which comprises contacting S with a coupling agent in the form of a slurry in the presence of water is disclosed. The invention described in the publication is a PAS having high adhesive strength.
Is intended to be manufactured. It is not disclosed that the mechanical strength such as the toughness of the weld portion can be improved when the injection molded product is used.

[0007]

DISCLOSURE OF THE INVENTION The present invention provides a polyarylene sulfide resin composition which gives an injection-molded article having high mechanical strength such as toughness of a welded part, and an injection-molded article having the characteristics.

[0008]

Means for Solving the Problems The present inventors have conducted various studies to solve the above problems. As a result, when the PAS is brought into contact with a prescribed amount of the coupling agent in the presence of the prescribed amount of water described below, an injection molded article that unexpectedly has a significantly high mechanical strength such as the toughness of the weld portion is obtained. The present invention has been completed by finding that a resin composition for use in the can be obtained. That is, the present invention comprises (1) 100 parts by weight of (A) polyarylene sulfide, (B) 0.05 to 10 parts by weight of a coupling agent, and 35 parts of water.
It is a polyarylene sulfide resin composition for injection molding, which is contact-containing in the presence of at least 1 part by weight.

In a preferred embodiment, (2) water is present in an amount of 35 to 2000 parts by weight, and (3) water is present in an amount of 100 to 1200 parts by weight. (4) The resin composition according to any one of (1) to (3) above, wherein the (B) coupling agent is an epoxy-based silane coupling agent, (5) above. The inorganic filler (C) is used in an amount of 0 to 40 per 100 parts by weight of the resin composition according to any one of (1) to (4).
Polyarylene sulfide resin composition containing 0 part by weight, (6) Polyarylene sulfide resin molding having a weld part, obtained by injection molding the resin composition according to any one of (1) to (5) above. (7) A polyarylene sulfide having a weld part, which is obtained by injection molding the resin composition according to any one of (1) to (5) above from two or more gates per molded product. Resin molded articles can be mentioned.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION In the PAS resin composition of the present invention, the upper limit of the amount of water present when (A) PAS and (B) a coupling agent are contact-containing is preferably 2000.
Parts by weight, more preferably 1200 parts by weight, particularly preferably 600 parts by weight, and the lower limit is 35 parts by weight, preferably 100 parts by weight, particularly preferably 135 parts by weight. Outside the above range, the effect of the component (B) coupling agent cannot be effectively exhibited, and therefore the strength of the welded part of the molded article cannot be improved.

In the presence of the above water, the components (A) and (B) are added.
As a method of contact-containing, for example, (1) a method in which a PAS powder containing 35% by weight to a saturated amount of water is sprayed with a coupling agent, and then mixed,
(2) A method in which a coupling agent is added to an aqueous slurry of PAS to bring them into contact with each other in a slurry state, and the like. In the method (2), most of the coupling agents are P
It is contained in PS but may partially remain in water. In any of the above methods (1) and (2), the contact between the both is preferably at room temperature to 90 ° C., preferably for 5 minutes to
It will be held for 1 hour. The PAS contacted by the above method is usually used after being filtered and then dried.

The method for obtaining the above-mentioned water-containing PAS powder or water slurry of PAS is not particularly limited. For example, (a) a method of adding PAS powder commercially available as a product through a drying step to water, (b) a method of adding PAS obtained in the desalting step of the post-treatment in the PAS manufacturing step to water, and the like. Can be mentioned. In the former method (a), it is preferable to use a solvent such as acetone, alcohol, an organic amide solvent (eg, N-methylpyrrolidone) used in the reaction step of PAS production together with water. As a result, water can be easily included in PAS that is not easily compatible with water. Then, it is preferable to wash PAS thoroughly with water to remove the used solvent from the water-containing PAS.
The latter method (b) is more preferably used because it is simpler. At this time, PAS may be used at any stage of the desalting process. P at the beginning of the desalting process
Since a large amount of by-product salt still exists in AS, it is more preferable to use PAS in the latter stage of the desalting step. Acid treatment may be performed in the latter stage of the desalting process, in which case P after acid treatment is performed.
AS may be used. Desalination and acid treatment are detailed below.

(A) PAS used in the present invention is a known polymer having an arylene sulfide repeating unit, and particularly preferably PPS. The method for producing PAS is not particularly limited, and it can be usually produced by reacting an alkali metal sulfide with a dihaloaromatic compound in an organic amide solvent. For example, the method described in JP-B-45-3368, the method using an alkali metal carboxylate described in JP-B-52-12240, US Pat.
No. 038263, a method using a polymerization aid such as lithium halide, a method using a cross-linking agent such as a polyhaloaromatic compound described in JP-B No. 54-8719, and JP-B No. 63-33775. It can be produced by a method using a multi-step reaction in the presence of different water described in 1.

[0014] Preferably, in the method described in JP-A-5-222196 for producing PAS by reacting an alkali metal sulfide with a dihaloaromatic compound in an organic amide solvent, a reaction vessel is used during the reaction. It is possible to use a method in which a part of the gas phase in the reaction vessel is condensed by cooling the gas phase part of the above and the solution is refluxed to the liquid phase. Use of this method is preferable because PAS having high mechanical strength such as tensile strength and impact strength can be obtained at low cost.

Organic amide solvents used for the production of PAS are known for PAS polymerization, for example N-methylpyrrolidone (NMP), N, N-dimethylformamide, N, N-dimethylacetamide, N- Methylcaprolactam, etc., and mixtures thereof can be used, NMP
Is preferred.

Alkali metal sulphides are also known, for example lithium sulphide, sodium sulphide, potassium sulphide, rubidium sulphide, cesium sulphide and mixtures thereof. These hydrates and aqueous solutions may be used. Hydrosulfides and hydrates corresponding to these can be used after being neutralized with the corresponding hydroxides.
Inexpensive sodium sulfide is preferred.

The dihalo aromatic compound is, for example, Japanese Patent Publication No.
It can be selected from those described in JP-A-5-3368, but is preferably p-dichlorobenzene. Further, a copolymer can be obtained by using one or more kinds of para-, meta- or ortho-dihalides of diphenyl ether, diphenyl sulfone or biphenyl in a small amount (20 mol% or less). For example, m-dichlorobenzene, o-dichlorobenzene,
p, p'-dichlorodiphenyl ether, m, p'-dichlorodiphenyl ether, m, m'-dichlorodiphenyl ether, p, p'-dichlorodiphenylsulfone, m, p'-dichlorodiphenylsulfone, m, m '
-Dichlorodiphenyl sulfone, p, p'-dichlorobiphenyl, m, p'-dichlorobiphenyl, m, m'-
Dichlorobiphenyl.

In order to increase the molecular weight of PAS,
For example, 1,3,5-trichlorobenzene, 1,2,4-
Polyhalo compounds such as trichlorobenzene can also be used, preferably in a concentration of 5 mol% or less, based on the total amount of the para and metadihalo aromatic compounds.

Further, as a small amount of other additives, a terminal terminating agent and a monohalo compound as a modifying agent can be used in combination.

The PAS obtained can be separated from by-products by post-treatment methods known to those skilled in the art. Usually, solvent removal is performed first, followed by desalting. Examples of the method for removing the solvent include a method by flash, a method by centrifugation, a method by filtration and the like. After removing the solvent, the PAS is then desalted. Desalting is preferably performed by dispersing PAS after removing the solvent in water. For example, the PAS slurry obtained as described above is centrifuged to obtain a PAS cake containing little solvent. The PAS cake is put into water, preferably 1 to 5 times by weight, stirred and mixed at room temperature to 90 ° C. for preferably 5 minutes to 10 hours, and then filtered. The stirring and mixing and filtration operations are preferably repeated 2 to 10 times to remove the solvent and by-product salts attached to the PAS, thereby completing the water washing. By performing water washing as described above, efficient washing can be performed with a smaller amount of water than in a washing method in which water is poured into a filter cake.

The PAS obtained as described above can be further acid-treated. The acid treatment is carried out at a temperature of 100 ° C. or lower, preferably 40 to 80 ° C.
If the temperature exceeds the above upper limit, the PAS molecular weight after the acid treatment decreases, which is not preferable. Also, below 40 ° C,
It is not preferable because the remaining inorganic salt precipitates to reduce the fluidity of the slurry and hinders the continuous treatment process. The concentration of the acid solution used for the acid treatment is preferably 0.01 to 5.0% by weight. Also, the pH of the acid solution
Is preferably 4.0 to 5.0 after the acid treatment. By adopting the above concentration and pH, -SY in PAS which is the object to be treated (Y represents an alkali metal)
Most of the ends can be converted to -SH ends, and corrosion of plant equipment and the like can be prevented, which is preferable.
The time required for the acid treatment depends on the acid treatment temperature and the concentration of the acid solution, but it is preferably 5 minutes or longer, particularly preferably 10 minutes or longer. Below the above, in PAS-
It is not preferable because the SY terminal cannot be sufficiently converted to the -SH terminal. Examples of the acid treatment include acetic acid, formic acid, oxalic acid, phthalic acid, hydrochloric acid, phosphoric acid, sulfuric acid, sulfurous acid, nitric acid, boric acid,
Carbonic acid or the like is used, with acetic acid being particularly preferred. By performing the treatment, an alkali metal such as sodium which is an impurity in the PAS can be reduced. Therefore, elution of alkali metal such as sodium during use of the product and deterioration of electrical insulation can be suppressed.

Examples of the component (B) coupling agent used in the present invention include silane coupling agents, titanium coupling agents, aluminum coupling agents and the like. Among these, silane coupling agents are preferable, and more preferable silane coupling agents are represented by the following general formula.

[0023]

Embedded image Here, Z in the above formula is a group represented by the following formula,

[0024]

Embedded image X is a hydrocarbon group having 1 to 15 carbon atoms (linear or branched alkylene, arylene or arylalkylene hydrocarbon group), and R is 1 to 15 carbon atoms.
Hydrocarbon groups having 8 (alkyl, cycloalkyl,
Aryl, aralkyl group), R ¹ is R or O
R, m is an integer of at least 1, and n
Is an integer of 1 to 3. Among these, Z is glycidoxy group, HS-, OCN-, R is methyl or ethyl group, R ¹ is OR (methoxy or ethoxy group), and X is-.
A compound represented by (CH ₂ ) _3- is desirable.

Specific examples of the silane coupling agent represented by the above general formula include γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropyltriethoxysilane, γ-mercaptopropyltrimethoxysilane,
γ-mercaptopropyltriethoxysilane, γ-isocyanatopropyltrimethoxysilane, γ-isocyanatopropyltriethoxysilane, γ-aminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, γ-chloropropyltrimethoxysilane, γ
-Chloropropyltriethoxysilane, β- (3,4-
Epoxycyclohexyl) ethyltrimethoxysilane,
γ-methacryloxypropyltrimethoxysilane, N-
Examples thereof include β- (aminoethyl) -γ-aminopropyltrimethoxysilane, N-phenyl-γ-aminopropyltrimethoxysilane, vinyltriethoxysilane and vinyltrimethoxysilane. Among the above-mentioned silane coupling agents, epoxy-based silane coupling agents are particularly preferable.

The PAS resin composition of the present invention can be produced by contact-containing the component (A) and (B) in the following amounts. That is, the upper limit of (A) is 99.
95 parts by weight, preferably 99.90 parts by weight, particularly preferably 99.50 parts by weight, the lower limit is 90 parts by weight, preferably 92.0 parts by weight, particularly preferably 95.0 parts by weight, and (B ) Is 10 parts by weight, preferably 8.0 parts by weight, particularly preferably 5.0 parts by weight, and the lower limit is 0.05 parts by weight, preferably 0.1 parts by weight, particularly preferably 0.5 parts by weight. is there. (A) exceeds the above upper limit,
If (B) is less than the above lower limit, the mechanical strength such as toughness of the welded part of the molded product cannot be increased. If (A) is less than the above lower limit and (B) exceeds the above upper limit, the compounding amount is However, not only the improvement of the effect is not recognized, but also the cost is increased, which is not preferable.

The PAS resin composition of the present invention may contain (C) an inorganic filler as an optional component.
(C) The inorganic filler is not particularly limited, and for example, a powdery / flaky filler, a fibrous filler, and the like can be used. Examples of the powdery / flaky filler include alumina, talc, mica, kaolin, clay, titanium oxide, calcium carbonate, calcium silicate, calcium phosphate, calcium sulfate, magnesium oxide, magnesium phosphate, silicon nitride, glass, Hydrotalcite,
Zirconium oxide, glass beads, carbon black and the like can be mentioned. Examples of the fibrous filler include glass fiber, asbestos fiber, carbon fiber, silica fiber, silica / alumina fiber, potassium titanate fiber, and polyaramid fiber. In addition to this, a filler such as ZnO tetrapot, metal salt (eg, zinc chloride, lead sulfate, etc.), oxide (eg, iron oxide, molybdenum dioxide, etc.), metal (eg, aluminum, stainless steel, etc.) may be used. it can. These can be used alone or in combination of two or more.

The content of the inorganic filler as the component (C) is 400 parts by weight, preferably 2 parts by weight, per 100 parts by weight of the PAS resin composition obtained by contacting the component (A) with the component (B).
00 parts by weight, particularly preferably 100 parts by weight. If the component (C) exceeds the above upper limit, the moldability deteriorates, which is not preferable. In order to increase the mechanical strength, it is preferable to add 0.01 parts by weight or more.

Further, if necessary, in addition to the above components,
Known additives and fillers such as antioxidants, ultraviolet absorbers, release agents, heat stabilizers, lubricants, colorants, and the like can be added.

The method of mixing the above components is not particularly limited. A method generally used widely, for example, a method of mixing the components with a mixer such as a Henschel mixer can be used.

To mold the molded article of the present invention, for example,
It can be easily and economically carried out by melt-kneading the above mixture with a single-screw or twin-screw extruder to once form a pelletized composition, and injection-molding the composition.

In the present invention, the weld portion is a portion where two or more resin flow flow front interfaces merge and are fused in the mold cavity in the injection molding method. When the resin is poured into a mold to obtain a molded product having windows and holes, the resin flow is divided into two or more resin flows in the mold, and the resin flows are further combined. Further, when the resin is poured into a mold in order to obtain a molded product having a change in wall thickness, the resin does not flow in one direction from the thick wall portion to the thin wall portion, and a plurality of resin flows are generated, which join together. In such a case, a weld portion is likely to occur. If there are two or more gates, or if a single-point gate is used to form a ring-shaped, circular, or square-cylindrical material, the occurrence of welds cannot be avoided. The welded portion can generally be identified by the appearance of linear color unevenness on the surface of the molded product or the appearance of a pattern in which the resin flows merge.

The molded product of the present invention is preferably obtained by injection molding by providing gates at two or more locations of one mold cavity corresponding to one molded product during injection molding. . An interface (weld part) where two or more resin flows corresponding to the number of gates are joined is necessarily formed in the molded product, and the interface region is wide, and therefore, conventionally, the strength defect of the weld part is also remarkable, There was a fatal obstacle to practical strength. The present invention is particularly effective in ameliorating the significant defects in the welded portion which occur in the molded product using two or more gates.

Examples of the molded product having a welded portion as described above include connectors as electronic parts, coil bobbins, printed circuit boards, chassis for electronic parts, lamp sockets as electric heating parts, dryer grills, thermostat bases, thermostat cases. Etc., brush holders as motor parts, bearings, motor cases, claws for copying machines as precision equipment, diaphragm parts for cameras,
Exhaust gas circulation valves, carburetors, alternator terminal blocks, tachometer housings, battery housings, etc. as watch parts, timepiece base plates, etc., or cleansing frames, insulators, pipe brackets, pump casings, tower fillings etc. as chemical equipment parts. There are many functional parts. It is preferably used as a connector. Although these molded products do not always have a weld portion, it is difficult to avoid the weld portion because of their function. Further, the above-mentioned molded product is an example, and the molded product having the weld portion is not limited to these.

Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to these Examples.

[0036]

【Example】

[0037]

Example 1 Flake-shaped sodium sulfide (60.8 wt% Na ₂ S) 19.2 was added to a 150 liter autoclave.
22 kg and 45.0 kg of NMP were charged. While stirring under a nitrogen stream, raise the temperature to 204 ° C, and water 4.600 kg.
Was distilled off (the amount of residual water is 1.08 mol per mol of sodium sulfide). Then, the autoclave was sealed and cooled to 180 ° C., and paradichlorobenzene (hereinafter sometimes abbreviated as p-DCB) 22.014 kg and NM
P18.0 kg was charged. The temperature was started by pressurizing to 1 kg / cm ² G with nitrogen gas at a liquid temperature of 150 ° C. When the liquid temperature reaches 250 ° C, stop raising the temperature and continue to 2
The reaction was stirred for an hour to proceed.

The resulting polymerized slurry was filtered by a conventional method to obtain a filter cake. The obtained filter cake was put into warm water at 80 ° C. to remove the by-product salt. The operations of washing with hot water and filtration were repeated 7 times. The purified cake thus obtained was charged with deionized water (about twice the weight of the filter cake by weight) to form a slurry. The amount of water present in the slurry is
It was 500 parts by weight with respect to 100 parts by weight of PPS. Γ-glycidoxypropyltrimethoxysilane (A187, trademark, as a silane coupling agent in the water slurry
0.5 parts by weight of 100 parts by weight of PPS (anhydrous basis) was added, and the mixture was stirred at room temperature for 30 minutes. Then, it is filtered and the obtained filter cake is 1
It was dried in a hot air circulation dryer at 20 ° C. for about 5 hours to obtain PPS (P-1) as a white powder.

[0039]

Example 2 A white powder was prepared in the same manner as in Example 1 except that 1.0 part by weight of γ-glycidoxypropyltrimethoxysilane was added to 100 parts by weight of PPS (anhydrous basis). PPS (P-2) was obtained.

[0040]

Example 3 A white powder was prepared in the same manner as in Example 1 except that 2.0 parts by weight of γ-glycidoxypropyltrimethoxysilane was added to 100 parts by weight of PPS (anhydrous basis). PPS (P-3) was obtained.

[0041]

Example 4 γ-glycidoxypropyltrimethoxysilane was added to the filter cake after the seventh washing with warm water, and PPS10
White powdery PPS was treated in the same manner as in Example 1 except that it was sprayed in an amount of 1.0 part by weight with respect to 0 part by weight (anhydrous basis), and then thoroughly mixed and brought into contact.
(P-4) was obtained. Here, the amount of water present in the filter cake was 113 parts by weight with respect to 100 parts by weight of PPS.

[0042]

Example 5 In place of γ-glycidoxypropyltrimethoxysilane, 1.0 part by weight of β- (3,4-epoxycyclohexyl) ethyltrimethoxysilane (A186, trademark, manufactured by Nippon Unicar Co., Ltd.) was used. Except
The same treatment as in Example 1 was performed to obtain white powdery PPS (P-
5) was obtained.

[0043]

Comparative Example 1 PPS (PC-1) in the form of white powder was obtained by the same treatment as in Example 1 except that γ-glycidoxypropyltrimethoxysilane was not added.

[0044]

Comparative Example 2 The PPS (PC-1) obtained in Comparative Example 1 was directly added to water and mixed for 30 minutes, and then filtered to obtain a hydrous PPS. The amount of water present in the hydrous PPS is PPS1.
It was 25 parts by weight with respect to 00 parts by weight. Then, the P
The same treatment as in Example 1 except that 1.0 part by weight of γ-glycidoxypropyltrimethoxysilane was sprayed to 100 parts by weight of PS (anhydrous basis), and then thoroughly mixed and brought into contact. And white powder PPS (P
C-2) was obtained.

Each PPS manufactured as described above was injection-molded as follows, and the strength of the weld portion was evaluated. 100 parts by weight of each PPS and glass fiber (CS 3J
961S, trademark, manufactured by Nitto Boseki Co., Ltd.) 67 parts by weight are pre-mixed with a Henschel mixer for 5 minutes to homogenize them, and then a 20 mmφ twin-screw counter-rotating extruder is used to rotate the barrel at a temperature of 300 ° C. Pellets were prepared by melt-kneading at several 400 rpm and extruding. In addition, for the PPS manufactured in Comparative Example 1, separately, PPS (PC-1) 10
0 parts by weight, 1.0 part by weight of γ-glycidoxypropyltrimethoxysilane (A187) and glass fiber 67
After preliminarily mixing 5 parts by weight with a Henschel mixer for 5 minutes to homogenize, the mixture was melt-kneaded in the same manner as above to prepare pellets (for Comparative Example 3).

Using an injection molding machine in which each of the finished pellets was set at a cylinder temperature of 320 ° C. and a mold temperature of 130 ° C., a flat plate having a width of 60 mm × a length of 170 mm × a thickness of 2 mm was used, and a mold having film gates on both sides was used. And molded. Then, after cutting this into a strip shape with a width of 20 mm, the tensile strength is measured according to ASTM D638,
Further, the Izod impact strength was measured according to ASTM D256 to evaluate the strength of the welded portion.

The above results are shown in Table 1.

[0048]

[Table 1] Examples 1 to 3 are PPS manufactured by changing the addition amount of the coupling agent within the scope of the present invention under the same conditions.
It is a composition. When the amount of the coupling agent used for the PPS treatment was increased, the strength of the weld part increased. Further, the PP of Comparative Example 1 not treated with the coupling agent
As compared with S, all of them exhibited significantly higher weld strength. Example 4 was treated under the same conditions as Example 2 by spraying the coupling agent onto PPS in the presence of less water within the scope of the present invention. Similar to Example 2, it showed good weld strength. Example 5
Shows that the type of coupling agent was changed under the same conditions as in Example 2. Similar to Example 2, it showed good weld strength.

On the other hand, in Comparative Example 2, the coupling agent was added to PPS by spraying in the same manner as in Example 4 in the presence of water below the range of the present invention. The strength of the welded portion was significantly lower than that of Example 4. Comparative Example 3
3] is a result of a composition obtained by uniformly mixing the PPS, the coupling agent, and the glass fiber produced in Comparative Example 1 and then melt-kneading the mixture. As compared with Examples 2 and 4 in which the amount of the coupling agent used was the same, the strength of the weld portion was significantly lower.

[0050]

INDUSTRIAL APPLICABILITY The present invention provides a polyarylene sulfide resin composition which gives an injection-molded article having high mechanical strength such as the toughness of a welded part, and an injection-molded article having the characteristics.

Claims (6)

[Claims] 1. (A) Polyarylene sulfide 100
A polyarylene sulfide resin composition for injection molding, comprising 0.05 to 10 parts by weight of the coupling agent (B) in contact with 35 parts by weight of water in the presence of 35 parts by weight of water. 2. The resin composition according to claim 1, wherein water is present in an amount of 100 to 1200 parts by weight. 3. The resin composition according to claim 1 or 2, wherein the coupling agent (B) is an epoxy silane coupling agent. 4. The inorganic filler (C) is added in an amount of 0 to 4 per 100 parts by weight of the resin composition according to any one of claims 1 to 3.
A polyarylene sulfide resin composition containing 100 parts by weight. 5. A polyarylene sulfide resin molded product having a weld portion, which is obtained by injection molding the resin composition according to claim 1. 6. A polyarylene sulfide resin molded product having a weld portion, which is obtained by injection molding the resin composition according to claim 1 from two or more gates per molded product. .